Patent Application
20230069971
The present invention refers to a device for dispensing powdery or pasty or liquid materials.
In general, the present invention relates to: apparatuses for volume measurement and delivery of flowing fluids or solid materials including a screw conveyor, or mixing plants with mixing outlets that receive material from multiple component outlets, e.g. paint cans, with vessels as components fixed in a circular configuration on a horizontal table, e.g. around a vertical axis.
In particular, the present invention refers to feeding mechanisms characterized by the means for feeding the components to the mixer by means of helical screws, non-return devices, valves, apparatuses which require an external operation adapted to each repeated and identical operation for measuring and separating a predetermined volume of fluid or fluid-solid material from a supply or container equipped with electrical control means.
The state of the art is represented by the patent EP-B1-2 266 689 concerning an apparatus for delivering a plurality of powders and other fluid materials, comprising a plurality of containers for containing the powders, a plurality of metering pumps, connected to a container or having a connector for releasably connecting a container to the respective pump, in which the capacity of the metering pump, i.e. the quantity delivered at each revolution, in the case of screw pumps, is selectable. By using metering pumps whose capacity can be selected, it is possible to reduce the time required to dispense a certain amount of material and increase the accuracy with which this amount is dispensed. In other words, it becomes possible to optimize speed on the one hand and accuracy on the other. The metering pumps comprise two pump mechanisms, preferably separate, one mechanism with a relatively large dispensing capacity and another mechanism with a relatively small dispensing capacity, and a lid. With such pumps, the quantities to be dispensed can vary over a wide range. It is also preferred that the described apparatus comprises at least one weighing device for weighing at least one, preferably all the quantities dispensed. Optimization of speed and/or accuracy is further facilitated if said larger part is at least ten times larger than said smaller part.
Furthermore, the state of the art is represented by U.S. Pat. No. 3,739,958 concerning a valve for the accurate control of the quantity of plastic pellets in an injection molding machine, comprising a plunger disposed in a sliding manner through the center of a screw with reciprocating motion and a valve plug attached to the injection side of the plunger. The force of the plasticized material delivered by the swivel screw opens the cap against an external force acting against the plunger. When the rotation of the screw stops, the external force moves the cap, thereby accurately controlling the quantity of shot. A spring is placed between the head and the end of the barrel, so as to exert a permanent extraction force on the piston.
The invention of EP-B1-2 266 689 solves the problem of dosing precision but the possibility of selecting and operating only one pump mechanism of the two available through the fixed unit equipped with a single driver greatly reduces the effectiveness of the procedure dosage and dispensing.
The technical problem is solved by using a two-driver system to be able to simultaneously operate the two mechanisms present in each pump.
Another way to increase dispensing efficiency is using elastic recovery systems of the return phases present in the dispensing and dosing process, taking inspiration from the invention of U.S. Pat. No. 3,739,958.
Document WO-A1-2018/198147 of the same Applicant describes a device according to the preamble of claim 1.
Object of the present invention is solving the aforementioned prior art problems by providing a device for dispensing powdery, pasty or liquid materials capable of operating the two mechanisms of each pump present in the device almost simultaneously, drastically reducing the duration of dispensing and dosing.
A further object is providing a device for dispensing powdery or pasty or liquid materials that is as versatile as possible, separating and individually managing the opening and closing of the delivery holes downstream of each pump.
The aforesaid and other objects and advantages of the invention, as will appear from the following description, are achieved with a device for dispensing powdery or pasty or liquid materials as claimed in claim 1. Preferred embodiments and non-trivial variants of the present invention are the subject matter of the dependent claims.
It is understood that all enclosed claims form an integral part of the present description.
It will be immediately obvious that numerous variations and modifications (for example related to shape, sizes, arrangements and parts with equivalent functionality) can be made to what is described without departing from the scope of the invention as appears from the attached claims.
The present invention will be better described by some preferred embodiments, provided by way of non-limiting example, with reference to the attached drawings, in which:
Referring to
Advantageously, the drive means 12, 13 comprise a first driver releasably connected to the head of the mechanism with a relatively large dispensing capacity of each of the pumps 2, and a second driver releasably connected to the head of the mechanism with a relatively small dispensing capacity of each of the pumps 2. In particular, the first driver and the second driver are operated independently after positioning the dispensing apparatus 3 with respect to each of the pumps 2.
Referring to
The movable hollow cylinder with an opening 14, 15 comprises a flanged portion 18 to interact with the elastic spring 16 with respect to the housing 9.
The movable hollow cylinder with a port 14, 15 comprises at least one sliding surface 17 for a linear sliding parallel to at least one of the mechanisms of the pump 2.
According to a variation not shown, the port 14 relating to the mechanism with a relatively large delivery capacity is positioned out of phase with respect to the port 15 relating to the mechanism with a relatively small delivery capacity. In this way, it is possible to obtain different connection combinations of the port 14, 15 with the second chamber of the pump 7, 8, depending on the position reached by the movable hollow cylinder with a port 14, 15, along a linear sliding section parallel to at least one of the pump mechanisms 2.
A rotary table 19 with respect to a vertical axis supports the plurality of containers 1 and the plurality of pumps 2, in order to be able to position each pump 2 aligned with respect to the actuation means 12, 13,
Referring to
The first and second drivers of the actuation means 12, 13 are shaped to make a prismatic connection of the hub shaft with the respective head of the pump screw 4, 5 sliding axially.
Referring to
The cartridge 25 is easily inserted into the interface seat of the housing 9.
Preferably, the second chamber of the pump 7, 8 is also provided with a plurality of ribs (not shown) designed to ensure sealing against the product that passes into the second chamber of the pump 7, 8 itself.
The flow of movement of powders and liquids takes place due to two dosing systems with different displacements, the screws 4, 5, in order to manage the optimization in terms of accuracy/speed ratio, by means of a positioning system of the rotary table 19 to allow the alignment with the drivers 12, 13 which are in a fixed position, which once aligned, through a second radial movement with respect to the rotary table 19 by means of the positioning means 11, are inserted into the provided cavities by exerting a thrust suitable for opening, mechanically, the outlet channels of the pumping system which, at the end of the cycle, will close due to the decompression of a spring 16.
The openings of the two mechanisms in a mutually out-of-phase position, that is, the opening of the mechanism with a relatively large dispensing capacity positioned out of phase with respect to the opening concerning the mechanism with a relatively small dispensing capacity, allow a management of the dosing phases.
In fact, throughout the stroke, there will be 3 main phases in succession:
phase 1. Channel of the first mechanism: closed, channel of the second mechanism: closed;
phase 2. Channel of the first mechanism: open, channel of the second mechanism: closed;
phase 3. Channel of the first mechanism: open, channel of the second mechanism: open.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102020000002281 | Feb 2020 | IT | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IT2021/050023 | 1/26/2021 | WO |
