This application claims priority from Dutch patent application 1025819 filed on Mar. 26, 2004, the contents of which are hereby incorporated by reference in their entirety.
1. Field of the Invention
The invention relates to devices for milking dairy animals and in particular to devices provided with disinfecting means for supplying disinfecting fluids to parts of the device. The invention further relates to methods of milking dairy animals including the performing of such disinfecting procedures.
2. Description of the Related Art
Devices for milking dairy animals are known in which, in the context of disinfection, steam is applied that is sufficiently hot for heating at least a part of a teat liner to a temperature at which micro-organisms and bacteria are killed or eliminated. The disinfection and/or sterilisation should preferably comprise the whole inner part of a teat liner. The known cleaning methods consist of the steps of: removing milk or other residues that are present on at least the teat liner by means of a cleaning fluid; removing the cleaning fluid, and disinfecting at least a part of the teat liner with steam. Such a device and method of milking a dairy animal are known for instance from PCT patent application WO 03/077645.
Prior cleaning methods begin with the mentioned first step of applying cleaning fluid. Applying both a cleaning fluid and a disinfecting fluid for cleaning, respectively disinfecting a teat liner implies a relatively large consumption of fluids and energy.
Thus, there is a particular need for an improved device that can ensure efficient and effective disinfection of the teat liners.
According to the invention, there is provided a method of milking animals and cleaning at least a part of a milking device for milking animals, such as cows, the method comprising: connecting at least one teat cup to a teat of an animal to be milked; milking the animal; and cleaning at least a part of the milking device that has come into contact with the animal or with the milk from the animal, wherein a first cleaning step comprises cleaning or disinfecting said part of the milking device with steam, and a subsequent cleaning step comprises treating with a fluid at least that part of the milking device that has been treated with steam. The invention is based on the insight that a cleaning method that begins with disinfection by means of steam is also able to remove milk or other residues that are present on at least a part of the teat liner. This enables saving of at least resources, time and energy.
In an embodiment of a method according to the invention, the first cleaning step takes place after the milking of the animal has finished. This means that at least a part of a teat liner is exposed to steam. All causers of udder diseases and udder infections on at least a part of the teat liner have now been eliminated. After disinfecting at least a part of the teat liner with the steam, residues that are present on at least a part of the teat liner are removed by means of a fluid. Therefore, in an embodiment of a device according to the invention, the disinfection device comprises a cleaning device for removing residues by means of a fluid. As a fluid may be applied, for example, water, air, a mix of water and air, or water with a chemical cleaning substance added thereto. The pressure of the steam and/or the cleaning fluid is capable of being regulated and determined.
In an embodiment of a method according to the invention, the further cleaning step is the second cleaning step.
Cooling and cleaning of at least a part of a teat liner can be achieved by passing fluids through the teat liner. Flushing with water forms a simple and energy-technically favourable method. The temperature of the water is capable of being regulated. A possibly still moist teat liner easily slides over a teat of a next dairy animal to be milked during the connection of a teat cup containing a teat liner.
In this context, additionally applying compressed air or sucking in air through the teat liner by means of the vacuum pump present in a milking system is, in principle, also possible. An advantage of the latter method relative to applying compressed air is the faster evaporation of condensate on a teat liner by the locally created low pressure in the proximity of a teat liner surface. The temperature of the compressed air is capable of being regulated.
In an embodiment of a method according to the invention, the further cleaning step is performed with a liquid, after which a subsequent cleaning step, which is preferably the third cleaning step, is performed with a gas, or vice versa.
As soon as a sufficiently low teat liner temperature has been attained and determined, the connection of the teat cup to a next dairy animal to be milked can start. In an embodiment of a method according to the invention, the temperature of the fluid is chosen in such a way that the part of the milking device that has been treated with steam, is cooled by the fluid.
An embodiment of a method according to the invention comprises the step of heating water to steam and the step of bringing the steam into contact with at least a part of the teat liner, the step of heating the steam comprising the step of heating the steam to such a temperature that the steam has a temperature of at least approximately 95° C. when it is in contact with at least a part of the teat liner. The disinfection with steam proposed in patent WO 03/077645 does not specify which steam temperatures can be taken into account. This implies a too great uncertainty as regards the temperature of the steam that is in contact with the teat liners. By prescribing a temperature of ≧95° C. of the steam that is in contact with a specific area of the milking device, i.e. at least a part of the teat liners, there is obtained a great certainty that the desired disinfection will actually be achieved with the desired parameters. Prior art devices in which the presumed temperature in the relevant portions of the device is lower, have necessitated extended cleaning times of a number of minutes. By ensuring a temperature of ≧95° C. a disinfecting time of a matter of seconds may be sufficient.
By control with the aid of temperature measuring devices and feed back regulation of a heating device for heating a disinfecting fluid, the temperature mentioned, or another desired temperature, will be achieved. Registering values of at least one control parameter for the control unit of the disinfection device is indispensable for a proper control of the actions performed during disinfecting.
Therefore, an embodiment of a method according to the invention comprises the step of registering values of at least one control parameter for the disinfection device. Control parameters are those parameters by which a disinfection treatment is determined, such as, for example, the duration of operation of the disinfection device, the amount of steam, the rate of flow of the steam, the pressure of the steam, etc.
Besides, it is pointed out that, apart from the frequently mentioned conversion from water into steam, also the conversion from a liquid fluid, comprising substantially water, into a gaseous fluid, comprising substantially steam, can be taken into consideration.
The temperature range for attaining a complete disinfection of at least a part of the teat liners, in which the causers of udder diseases and udder infections are killed, lies approximately between 100° C. and 180° C. In view of inter alia the fact that a disinfection that eliminates causers of udder diseases and udder infections is in principle adequate, and in view of the thermal loadability of a teat liner and the intensive elastic deformations of a teat liner under operating conditions, a range between 100° C. and 150° C. may be chosen as a practical, active temperature range for steam disinfection of at least a part of the teat liners. Additionally, it is pointed out that steam is only one of a plurality of disinfecting fluids that can be taken into consideration.
Furthermore, the aforementioned patent does not propose measuring means for checking the temperature of the steam with which at least a part of a teat liner is brought into contact. Uncertainty as regards the temperature of a disinfecting fluid, in this case steam, resulting in uncertainty as regards the effectiveness of a disinfection treatment, is the undesired consequence.
In an embodiment of a method according to the invention, the method comprises the step of heating water to steam and the step of bringing the steam into contact with the teat liner, and in that the step of heating the water to steam comprises the step of heating the steam to such a temperature that at least a part of the teat liner is capable of being heated by the steam to a temperature of at least approximately 95° C.
In an embodiment of a method according to the invention, the method comprises the step of heating water to steam and the step of bringing the steam into contact with the teat liner, the step of heating the water to steam comprising the step of heating the steam to such a temperature that the steam has a temperature between approximately 100° C. and approximately 150° C. when the steam is in contact with at least a part of the teat liner.
In an embodiment of a method according to the invention, the method comprises the step of heating water to steam and the step of bringing the steam into contact with the teat liner, the step of heating the water to steam comprising the step of heating the steam to such a temperature that at least a part of the teat liner is capable of being heated by the steam to a temperature between approximately 100° C. and approximately 150° C.
In an embodiment of a method according to the invention, the fluid contains a chemical cleaning substance.
In an embodiment of a method according to the invention, if the further cleaning step is performed with the chemical cleaning substance, a subsequent cleaning step, which is now the third cleaning step, is performed with water, and, if desired, as a following step, a cleaning step is performed with a gas.
In an embodiment of a method according to the invention, the milking device comprising a disinfection device with a heating device for heating water to steam, the disinfection device being suitable for bringing the steam into contact with a teat liner, and the milking device comprising a control unit which is suitable for controlling the disinfection device, the method comprises the step of controlling the disinfection device with the aid of a first regulation parameter.
In an embodiment of a method according to the invention, the first regulation parameter is a control parameter.
In an embodiment of a method according to the invention, the method comprises the step of registering values of at least one control parameter for the disinfection device.
In an embodiment of a method according to the invention, the control parameter is time-dependent.
In an embodiment of a method according to the invention, the control parameter is the duration of operation, and the method comprises the step of putting the disinfection device into operation by the control unit.
In an embodiment of a method according to the invention, the control parameter is the amount of steam, and the method comprises the step of putting the disinfection device into operation by the control unit.
In an embodiment of a method according to the invention, the method comprises the step of putting the disinfection device out of operation by the control unit when a threshold value is exceeded.
In an embodiment of a method according to the invention, the threshold value is an adjustable threshold value.
In an embodiment of a method according to the invention, the threshold value amounts to between approximately 2 and approximately 5 minutes.
In an embodiment of a method according to the invention, the method comprises the step of releasing the steam by a release device, the step of putting the release device into operation, and the step of putting the release device out of operation when a threshold value is exceeded.
In an embodiment of a method according to the invention, the threshold value amounts to between approximately 3 and approximately 15 seconds.
In an embodiment of a method according to the invention, the method comprises the step of determining the identity of an animal, and the step of controlling the disinfection device partially with the aid of the determined animal identity.
In an embodiment of a method according to the invention, the method comprises the step of actively cooling at least a part of the teat liner.
In an embodiment of a method according to the invention, the method comprises the step of controlling the disinfection device with the aid of a second regulation parameter.
In an embodiment of a method according to the invention, the second regulation parameter is an adjustable threshold value.
In an embodiment of a method according to the invention, the second regulation parameter has an animal-dependent value.
In an embodiment of a method according to the invention, the method comprises the step of measuring the temperature of the steam that is in contact with at least a part of the teat liner, the step of generating a first temperature signal that is indicative of the measured steam temperature, and the step of supplying the first temperature signal to the control unit.
In an embodiment of a method according to the invention, the method comprises the step of measuring the temperature of at least a part of the teat liner, the step of generating a second temperature signal that is indicative of the measured teat liner temperature, and the step of supplying the second temperature signal to the control unit.
In an embodiment of a method according to the invention, the teat liner being made of elastic material, the method comprises the step of measuring a displacing behaviour of at least a part of the teat liner.
In an embodiment of a method according to the invention, the teat liner comprising a teat receiving aperture and a milk discharge aperture, the method comprises the step of displacing the temperature measuring member to a position above the teat receiving aperture of a teat liner.
In an embodiment of a method according to the invention, the teat liner comprising a teat receiving space for receiving a teat of a dairy animal, the teat receiving space being the space in a teat liner between the teat receiving aperture and the milk discharge aperture of a teat liner, the method comprises the step of inserting the temperature measuring member into the teat receiving space of a teat liner.
In an embodiment of a method according to the invention, the temperature measuring member is an infrared sensor or an air flow sensor.
In an embodiment of a method according to the invention, the method comprises the step of controlling, with the aid of a desired steam temperature of the steam that is in contact with the teat liner, the heating device for heating the steam in such a way that the steam that is in contact with at least a part of the teat liner is capable of being heated to the desired steam temperature.
In an embodiment of a method according to the invention, the method comprises the step of controlling, with the aid of a desired teat liner temperature of the part of a teat liner that is in contact with the steam, the heating device for heating the steam in such a way that at least the part of the teat liner that is in contact with the steam is capable of being heated to the desired teat liner temperature.
In an embodiment of a method according to the invention, the method comprises the step of comparing the measured temperature with the desired temperature, the step of generating a comparison signal that is indicative of the comparison result, the step of supplying the comparison signal to the control unit, and the step of controlling, with the aid of said comparison signal, the heating device by the control unit in such a way that the desired temperature is attainable.
In an embodiment of a method according to the invention, the milking device also being provided with a detection device for detecting physical and/or chemical abnormalities in milk secreted by a dairy animal, the method comprises the step of controlling the disinfection device with the aid of data from the detection device.
In an embodiment of a method according to the invention, the method comprises the step of automatically connecting a teat cup to a teat of a dairy animal by means of a robot arm.
In an embodiment of a method according to the invention, the method comprises the step of controlling the robot arm for automatically connecting a teat cup to a teat of a dairy animal when a parameter value comes below an adjustable threshold value for the second temperature signal and the disinfection device is out of operation.
In an embodiment of a method according to the invention, the threshold value for the second temperature signal is approximately 40° C.
In an embodiment of a method according to the invention, the teat liner comprising a teat receiving aperture and a milk discharge aperture and the milk discharge aperture being in connection with a foremilk discharge device, the method comprises the step of displacing the steam in a direction from the teat receiving aperture to the milk discharge aperture in such a way that the steam gets into the foremilk discharge device.
In an embodiment of a method according to the invention, the method comprises the step of moving the teat liner in a pulsating manner when the steam is being brought into contact with at least the teat liner.
A further method according to the invention is a method of milking a dairy animal which comprises the step of disinfecting at least a part of a teat liner by heating the teat liner, the disinfection being performed by a disinfection device that is controlled by a control unit, the teat liner is heated directly, and at least a part of the teat liner attains a temperature of at least approximately 95° C.
In an embodiment of a method according to the invention, the last method comprises the step of registering values of at least one control parameter for the disinfection device.
The invention further relates to a device for milking a dairy animal, comprising a teat cup with a teat liner, and a disinfection device for disinfecting at least a part of the teat liner with steam, the disinfection device comprising a heating device for heating the water to steam, and the disinfection device being suitable for bringing the steam into contact with the teat liner, and comprising a control unit which is suitable for controlling the disinfection device, the heating device being suitable for heating the water to steam to such a temperature that the steam has a temperature of at least approximately 95° C. when it is in contact with the teat liner. In an embodiment of this device according to the invention, the control unit is suitable for registering values of at least one control parameter for the disinfection device.
The causers of udder diseases and udder infections that are present on at least a part of a teat liner are at least eliminated if the relevant surfaces of a teat liner attain a sufficiently high temperature during the disinfection. Therefore, in an embodiment of a device according to the invention, the heating device is suitable for heating water to steam to such a temperature that at least a part of the teat liner is capable of being heated by the steam to a temperature of at least approximately 95°.
In view of the not unlimited thermal loadability of a teat liner and an adequate disinfection result, an embodiment of a device according to the invention in which the heating device is suitable for heating water to steam to such a temperature that at least a part of the teat liner is capable of being heated by the steam to a temperature between approximately 100° C. and approximately 150° C. is a good compromise.
Under the current, usual milking conditions the aforementioned device is capable of effecting the adequate, desired disinfection. However, it is well possible that the development in teat liner materials leads to materials that are fairly temperature-insensitive. Poor conduction of heat through the teat liner material is undesirable. In that case, exposure of teat liners to hot disinfecting fluids will not lead to the high teat liner temperatures that have to be obtained for a successful disinfection. This is the underlying idea of an embodiment of the inventive idea, in which the heating device is suitable for heating water to steam to such a temperature that the steam has a temperature between approximately 100° C. and approximately 150° C. when the steam is in contact with at least a part of the teat liner.
It may be desirable to apply particular cleaning fluids, for example water plus a chemical cleaning substance added thereto. In this context, an acid or a base can be taken into consideration.
In an embodiment of a device according to the invention, means are present for that purpose. The disinfection device comprises a cleaning device for removing, by means of a chemical cleaning substance, milk and/or other residues that are present on at least a part of the teat liner.
Now, chemical cleaning substance residues that remain present on at least a part of the teat liner first have to be removed, for example with water, before a next milking can take place.
In an embodiment of a device according to the invention, the disinfection device comprises means for removing the chemical cleaning substance that is present on at least a part of the teat liner.
In an embodiment of a device according to the invention, the control unit that controls the disinfection device is suitable for controlling the disinfection device with the aid of a first regulation parameter. As a first regulation parameter for controlling the disinfection device a control parameter may be chosen. By registering values of at least one control parameter and controlling the disinfection device with the aid of these control parameter values, feedback regulation of disinfection process parameters is possible. There is thus obtained a firmer grip on a correct performance of the disinfection procedure.
In an embodiment of a device according to the invention, the control parameter is time-dependent.
In an embodiment of a device according to the invention, the control unit is suitable for putting the disinfection device into operation and the control parameter is a time-dependent parameter, such as, for example, the duration of operation. The amount of released steam may also be chosen as a control parameter.
In an embodiment of a device according to the invention, the control unit is suitable for putting the disinfection device out of operation when a threshold value is exceeded. This threshold value may be an adjustable threshold value. In the case that the milking system and in particular the teat liners are cleaned with water, a mix of water and air, or water with a chemical cleaning substance added thereto, a threshold value in the range between approximately 2 and 5 minutes may be chosen.
In an embodiment of a device according to the invention, the disinfection device comprises a release device for releasing the steam, the control unit being suitable for putting the release device into operation and for putting the release device out of operation when a threshold value is exceeded. By registering values of at least one control parameter and by putting the release device of the disinfection device out of operation when it is established that a threshold value is exceeded, a proper protection against thermal overload of the teat liners is achieved. Putting the release device out of operation in time is absolutely necessary from a point of view of security. Also from an environmental point of view it is desirable that the release device is put out of operation in time.
In an embodiment of a device according to the invention, the threshold value at which the release device is put out of operation has a time-dependent value, in particular a span of time. When applying steam as a disinfecting fluid, the threshold value can be between approximately 3 seconds and approximately 15 seconds; when applying water and chemical substances, a threshold value of approximately 1 minute can be taken into consideration.
In an embodiment of a device according to the invention, the milking device comprises an animal identification system for determining the identity of an animal and for supplying an animal identification signal to the control unit, the control unit controlling the disinfection device at least partially with the aid of the animal identification signal. An animal related disinfection and/or cleaning treatment of at least a part of the teat liner is thus possible.
In an embodiment of a device according to the invention, the disinfection device of the milking device comprises a cooling device for actively cooling at least a part of the teat liner. After having been exposed to a hot disinfecting fluid, a teat liner has to be cooled before it is possible to connect the teat liner again to a teat of a dairy animal. In an embodiment of a device according to the invention, the cooling device comprises a vacuum pump, but it is also possible to effect an adequate cooling with compressed air or water. In an embodiment of a device according to the invention, there are provided technical means for applying the aforementioned fluids. The cooling device is capable of being controlled by the control unit, partially by the possibility of inputting a regulation parameter value for the cooling device. This regulation parameter value may be, for example, a span of time during which cooling has to take place, a desired final cooling temperature, etc. The cooling intensity is thus inputted.
In an embodiment of a device according to the invention, the control unit comprises an input device for inputting a second regulation parameter for controlling the disinfection device. Said second regulation parameter may relate, for example, to an adjustable threshold value or an animal-dependent value. The second regulation parameter can be a control parameter of the desinfection device.
Measuring the temperature of the steam that is in contact with the teat liner is necessary for being able to control the disinfection process. By supplying the measurement data to the control unit it is possible to store these data and to process them for the purpose of feedback regulation of the heating device for the steam. There is thus obtained a closed control loop, which increases the reliability of a successful disinfection to a great extent. In an embodiment of a device according to the invention, the disinfection device is provided for that purpose with a first temperature measuring member for measuring the temperature of the steam that is in contact with at least a part of the teat liner, for generating a first temperature signal that is indicative of the measured steam temperature and for supplying the first temperature signal to the control unit.
In an embodiment of a device according to the invention, the disinfection device is provided with a second temperature measuring member for measuring the temperature of at least a part of the teat liner, and for generating a second temperature signal that is indicative of the measured teat liner temperature, and for supplying the second temperature signal to the control unit.
In an embodiment of a device according to the invention, in which the teat liner is made of elastic material, the second temperature measuring member is suitable for measuring a displacing behaviour of at least a part of the teat liner. The mentioned temperature measuring means may be embedded inter alia in a teat liner, and/or be disposed on a teat liner, and/or be disposed on a teat cup, and/or be embedded in a teat cup.
In an embodiment of a device according to the invention, in which the teat liner comprises a teat receiving aperture and a milk discharge aperture, the temperature measuring member is located above the teat receiving aperture of a teat liner or is capable of being displaced to said position. An infrared sensor is one of a plurality of temperature measuring means that may be applied. The temperature measuring member (or temperature measuring means) may be disposed on a robot arm of the milking device. However, the temperature measuring member may be located as well between the disinfection members 13.
A proper measurement of the temperature of the steam that is in contact with the teat liner or the temperature of the teat liner that is in contact with the steam is obtained if the temperature measuring member is located above the teat liner. A possible constructive embodiment of this idea may result in a temperature measuring member that is positioned above the teat liner, in particular the teat receiving aperture, only at the moment of measuring.
In an embodiment of a device according to the invention, in which the teat liner comprises a teat receiving space for receiving a teat of a dairy animal and the teat receiving space is the space in a teat liner between the teat receiving aperture and the milk discharge aperture of a teat liner, the temperature measuring member is capable of being inserted into the teat receiving space of a teat liner. The temperature measuring member, for example an infrared sensor or an air flow sensor, is located for example in or on a disinfecting member that is inserted into a teat liner during the disinfection. Measuring in the immediate vicinity of the teat liner surface increases the reliability of the measurement results. It is pointed out that the infrared sensor and/or air flow sensor can also occupy fixed positions in the disinfection device.
A temperature feedback control circuit increases the reliability of the achievement of the desired values of the disinfection process parameters. The now following embodiments result from this basic idea. In an embodiment of a device according to the invention, the regulation parameter is a desired steam temperature of the steam that is in contact with the teat liner, and the control unit controls, with the aid of the desired steam temperature, the heating device for heating the steam in such a way that steam that is in contact with the teat liner is capable of being heated to the desired steam temperature.
In an embodiment of a device according to the invention, the regulation parameter is a desired teat liner temperature of the part of a teat liner that is in contact with the steam, and the control unit controls, with the aid of the teat liner temperature, the heating device for heating the steam in such a way that at least the part of the teat liner that is in contact with the steam is capable of being heated to the desired teat liner temperature.
In an embodiment of a device according to the invention, the control unit is provided with a comparing device for comparing the measured temperature with the desired temperature, for generating a comparison signal that is indicative of the comparison result and for supplying the comparison signal to the control unit, the control unit controlling, with the aid of said comparison signal, the heating device in such a way that the desired temperature is attainable.
In an embodiment of a device according to the invention, in which the milking device is also provided with a detection device for detecting physical and/or chemical abnormalities in milk secreted by a dairy animal, the control unit controls the disinfection device with the aid of data from the detection device. Based on a measured/determined milk quality, the control unit is capable of adjusting the disinfection process in an intelligent manner. If, for example, milk with a high somatic cell count is detected, a longer disinfection time or a larger amount of steam is desirable.
In an embodiment of a device according to the invention, the milking device comprises a robot arm for automatically connecting a teat cup to a teat of a dairy animal.
In an embodiment of a device according to the invention, the robot arm is capable of being controlled by the control unit for automatically connecting a teat cup to a teat of a dairy animal when a parameter value comes below an adjustable threshold value for the second temperature signal and the disinfection device is out of operation. As a threshold value for the second temperature signal approximately 40° C. may be chosen. As soon as at least a part of a teat liner has attained such a temperature and this has actually been established, the teat liner is suitable for being connected to the teat of a dairy animal. There is thus created a protection against the connection of teat liners having a too high temperature.
In an embodiment of a device according to the invention, the disinfection device is provided with an additive member for adding an additive. Before the steam exercises its disinfecting action on at least a part of the teat liner of a milking device, an indication substance can be applied in a teat liner. After disinfecting, it is possible by measuring, for example, discoloration of the indication substance, with the aid of technical means, whether the intended disinfection has been successful and/or to what extent all the surfaces to be disinfected have actually been disinfected. It is also possible to add, by means of the additive member, an additional disinfecting substance to the steam just before the moment the steam comes into contact with a teat liner surface. This may be desirable because of chemical reactivity of the steam with the additive. In this context, by indication substance and additive are also meant indication fluids and additional fluids. In an embodiment of a device according to the invention, the additive member is capable of being controlled by the control unit.
In an embodiment of a device according to the invention, in which the teat liner comprises a teat receiving aperture and a milk discharge aperture and the milk discharge aperture is connected to a foremilk discharge device, the disinfection device is suitable for displacing the steam in a direction from the teat receiving aperture to the milk discharge aperture, in a way in which the steam gets into the milk discharge device. It is thus achieved that the disinfection also comprises the connecting milk line between a teat liner and the foremilk discharge device, and the foremilk discharge device per se. A temperature measuring member at the place where the foremilk discharge device is located measures the temperature of the steam at that place. By feedback of the measured steam temperature to the control unit the heating device of the disinfection device can be controlled in such a way that a desired steam temperature of the steam in the foremilk discharge device is actually achieved. For this purpose, temperature measuring means may also be included in the aforementioned connecting milk line.
In an embodiment of a device according to the invention, the disinfection device of the milking device comprises a pulsation device for pulsating at least a part of the teat liner and a control unit for registering values of at least one control parameter for the disinfection device. Said pulsation device makes it possible to vibrate the teat liner at a high pulsation frequency when a disinfecting fluid or cleaning fluid is being brought into contact with at least a part of the teat liner. The removal of milk and/or other residues on a teat liner surface is promoted in this manner.
Finally, within the context of the inventive idea, as regards the disinfection of at least a part of a teat liner in a milking device by prescribing a temperature of ≧95° C., it is pointed out that an adequate disinfection can also be achieved by direct heating of at least a part of a teat liner. Control with the aid of temperature measuring means and feedback regulation of a heating device for heating at least a part of the teat liner are again essential to a safe, successful disinfection. Registration of control parameter values increases the intended disinfection certainty.
The features and advantages of the invention will be appreciated upon reference to the following drawings of a number of exemplary embodiments, in which:
The fluid applying device 12 is connected to a fluid vessel 34 and a heating device 11 via a fluid supply line 17. Said fluid vessel 34 is filled with water. It is also possible to provide each individual disinfecting member 13 with its own supply line and fluid vessel. When valve 15 is in its shut off position, valve 14 is controlled to be opened. Due to this, water is admitted to the heating device 11. Valve 14 and release device 16 are shut off at the moment when a (non-shown) fluid level measuring member detects a particular water level in the heating device 11. Now, a heating element 18 that is located in the heating device 11 heats the water to steam. A valve 21 is included in the fluid discharge line 19. By shutting off valve 21 a short fluid discharge line is obtained. Disinfecting and cleaning can now be started.
First of all disinfecting is started. The release device 16 is controlled to be opened, (valves 15 and 14 in shut off position) so that steam is now conveyed from the heating device 11, via the fluid supply line 17, the fluid applying device 12 and the disinfecting members 13, through the teat liners 30, the fluid discharge line 19 and the foremilk discharge device 20. After a span of time of approximately 3 to 15 seconds, the release device 16 shuts off the release of steam. The valves 14, 15, 21 included in the disinfection device 10 and the release device 16 are automatically controlled by a control unit 5. For this purpose, said control unit 5 is capable of registering values of at least one control parameter for the disinfection device 10. In this embodiment, only the disinfection of a part of the total milking system has been elaborated. It is obvious that steam disinfection is suitable for all the parts of the milking system that have been in contact with the milk yielded or constitute part of the system. Many constructive embodiments are possible for this purpose.
Subsequently, cleaning by means of a fluid takes place. When valve 14 and release device 16 are shut off and valve 15 is controlled to be opened, water can be conveyed from the fluid vessel 34, through the fluid supply line 17, the fluid applying device 12, the disinfecting members 13, the teat liners 30, the fluid discharge line 19 and the foremilk discharge device 20. The temperature of the water is capable of being regulated. Now, the disinfection device 10 functions as a whole as it were as a cleaning device. The water removes residues that have remained after the disinfection. After the cleaning has been finished, the valve 15 is shut off. Subsequently blowing compressed air into the teat liners 30 (the technical means required for this purpose are not depicted in
The disinfection device 10 comprises a first temperature measuring member (for example an infrared sensor) 32 (
After at least a part of a teat liner 30 has been disinfected, the temperature of the heated teat liner 30 has to be actively cooled to a teat liner temperature that is pleasant for an animal to be milked. A second temperature measuring member (for example an infrared sensor) 31 (
A possible embodiment of a disinfection device for direct heating and thus disinfecting at least a part of the teat liner 30 is shown in
Thus, the invention has been described by reference to certain embodiments discussed above. It will be recognized that these embodiments are susceptible to various modifications and alternative forms well known to those of skill in the art. Many modifications in addition to those described above may be made to the structures and techniques described herein without departing from the spirit and scope of the invention.
Number | Date | Country | Kind |
---|---|---|---|
1025819 | Mar 2004 | NL | national |