Patent Application
20190127183
The present invention relates to an elevator door device, and more particularly, to an elevator door device capable of detecting failure of a safety shoe provided on a leading end portion of a car door of an elevator.
In recent years, a door configured to open and close a car doorway of an elevator includes a safety device. The safety device detects, during a door closing operation of a car door, that an obstacle such as a user of the elevator or baggage of the user is brought into contact with a leading end portion of the car door, and reverses the car door and a landing door in a door opening direction before the caught of the obstacle by the car door.
As such a safety device, for example, there is known a safety shoe. The safety shoe is provided on a side surface of the car door on the landing side so that a part thereof is protruded from the leading end portion of the car door. Further, the safety shoe is provided vertically between upper and lower sides of the car door. When the safety shoe is moved by a distance set in advance in the door opening direction of the car door due to an obstacle or other reasons, a shoe switch detects an amount of movement of the safety shoe. Then, when the amount of movement exceeds a threshold value, the car door and the landing door are reversed.
However, in some cases, operation failure occurs in the shoe switch. For example, although no obstacle is in contact with the safety shoe, the safety shoe may be erroneously detected as being moved, and the reversing operation of the car door and the landing door may be repeated. Such operation failure is hereinafter referred to as “ON failure”.
Further, in contrast, when the movement of the safety shoe is not detected even though an obstacle is in contact with the safety shoe, the car door and the landing door do not perform the reversing operation. In this case, a trouble that the obstacle is caught in the door may occur. Such operation failure is hereinafter referred to as “OFF failure”.
As related-art failure detection devices configured to detect the failure of the safety device, there are known, for example, Patent Literatures 1 to 3.
In Patent Literature 1, there is described a method of detecting ON failure. In Patent Literature 1, the shoe switch configured to detect the amount of movement of the safety shoe is formed of normally closed contacts. Therefore, when a door opening button is not pressed and a door closing command is ON while the door is fully opened, in a normal state, the shoe switch is closed. Meanwhile, when the shoe switch is opened, it is determined that the safety shoe has the ON failure.
Further, in Patent Literature 2, there is described a method of detecting OFF failure. In Patent Literature 2, a protruding portion is mounted on the safety shoe. The protruding portion is provided so as to be opposed to a doorstop portion of the car door. During normal operation, the protruding portion moves the safety shoe while the door is fully closed, and then the inner contacts of the shoe switch are opened. Therefore, when the inner contacts of the shoe switch are still in the closed state even while the door is fully closed, it is determined that the safety shoe has the OFF failure.
Further, in Patent Literature 3, there is proposed a method involving providing an electromagnet device for retreating the safety shoe, and causing the safety shoe to retreat during the door closing operation through control of the electromagnet device to detect the operation failure of the safety shoe. In Patent Literature 3, the electromagnet device is used to turn on or off the shoe switch at any timing.
However, in the method of detecting ON failure of Patent Literature 1, the failure is detected while the door is fully opened. Therefore, a case in which the shoe switch is activated due to failure cannot be distinguished from a case in which the shoe switch is activated when the safety shoe is pushed in by humans. Therefore, there is a problem in that, although no failure is occurring, it is erroneously detected due to human factors that the failure is occurring. In order to eliminate the human factors, the failure of the safety shoe is required to be detected at the time when the safety shoe cannot be touched, that is, while the door is fully closed.
In the method of detecting OFF failure of Patent Literature 2, the failure is detected while the door is fully closed. Therefore, the door is in a fully closed state, and the safety shoe is not pushed in by humans. Thus, the failure is not erroneously detected due to human factors. However, in the method of Patent Literature 2, the shoe switch is always activated by the protruding portion while the door is fully closed, and hence there is a problem in that, although the OFF failure of the safety shoe can be detected, the ON failure cannot be detected.
In Patent Literature 3, the safety shoe can be freely operated, and hence both of the ON failure and the OFF failure of the safety shoe can be detected while the door is fully closed. However, the electromagnet device for operating the safety shoe and a control device therefor are required to be installed, and hence there is a problem of increase in cost.
The present invention has been made to solve the above-mentioned problems, and has an object to provide an elevator door device capable of detecting OFF failure and ON failure of a safety shoe while a door is fully closed with a simple configuration and at low cost.
According to one embodiment of the present invention, there is provided an elevator door device including: a car door provided in a doorway of a car of an elevator; a safety shoe, which is provided on a leading end portion of the car door in a closing direction of the car door, and is configured to move in opening and closing directions of the car door; a shoe switch, which is provided on the car door, and is configured to detect that the safety shoe is moved by a certain distance set in advance in the opening direction of the car door; a full-closure recognition switch, which is provided in the doorway of the car, and is configured to detect that the car door is located at a fully closed position; a failure detection vane coupled to the safety shoe; a failure detection roller, which is provided on at least one of landings of the elevator, and is to be brought into contact with the failure detection vane when the car door is brought into the fully closed state to move the safety shoe by the certain distance in the opening direction of the car door; and a failure determination unit configured to determine, when the car has landed on one of the landings of the elevator, whether the full-closure recognition switch detects that the car door is located at the fully closed position and the shoe switch detects that the safety shoe is moved by the certain distance by the failure detection roller based on a result of detection by the full-closure recognition switch and a result of detection by the shoe switch, to thereby determine whether operation failure of the safety shoe has occurred.
According to one embodiment of the present invention, with only simple change in mechanical structure, that is, by providing the failure detection vane and the failure detection roller, it is possible to provide the elevator door device capable of detecting the ON failure and the OFF failure of the safety shoe while the door is fully closed at low cost.
Elevator door devices according to embodiments of the present invention are described with reference to the drawings. Throughout the drawings, like or corresponding parts are denoted by like reference symbols. Further, description of those like or corresponding parts is not repeated, and is simplified or omitted as appropriate.
In the elevator door devices according to the embodiments of the present invention, floors of a building in which an elevator is installed are divided into an OFF-failure detection floor and an ON-failure detection floor. Then, OFF-failure detection is performed on the OFF-failure detection floor, and ON-failure detection is performed on the ON-failure detection floor. In the elevator door devices according to the embodiments of the present invention, only by adding simple members (see reference symbols 28 and 29) to a car and the OFF-failure detection floor, ON failure and OFF failure of a safety shoe can be detected under a state in which a door is fully closed. As described above, the failure detection is performed under a state in which the door is fully closed, and hence the safety shoe is not pushed in by humans. Thus, erroneous detection due to human factors does not occur.
In
Above the car doorway, a car girder 4 is provided. A car door rail 5 is mounted on the car girder 4 along opening and closing directions of the car door panel 1, that is, in the horizontal direction. The car door rollers 3 are engaged with an upper end of the car door rail 5. The car door panel 1 is hung by the car door rail 5 through intermediation of the car door hanger 2 and the car door rollers 3. The car door rollers 3 are rolled and guided by the car door rail 5 so that the car door panel 1 opens and closes the car doorway.
Further, car door shoes 6 are mounted on a lower end of the car door panel 1. Meanwhile, a car door sill 7 is mounted at a lower portion of the car doorway. The car door sill 7 has a groove formed therein. The car door shoes 6 are fitted into the groove of the car door sill 7 to be moved while being guided by the groove. The car door shoes 6 and the groove of the car door sill 7 prevent the car door panel 1 from moving in a depth direction (Z-axis direction). The members 1 to 7 provided in the car doorway construct a “car door” provided in the car doorway of the elevator.
As illustrated in
Above the landing doorway, a landing girder 11 is provided. A landing door rail 12 is mounted on the landing girder 11 along opening and closing directions of the landing door panel 8, that is, in the horizontal direction. The landing door rollers 10 are rotatably engaged with an upper end of the landing door rail 12. The landing door panel 8 is hung by the landing door rail 12 through intermediation of the landing door hanger 9 and the landing door rollers 10. The landing door rollers 10 are rolled and guided by the landing door rail 12 so that the landing door panel 8 opens and closes the landing doorway.
Further, landing door shoes 13 are mounted on a lower end of the landing door panel 8. Meanwhile, a landing door sill 14 is mounted at a lower portion of the landing doorway. The landing door sill 14 has a groove formed therein. The landing door shoes 13 are fitted into the groove of the landing door sill 14 to be moved while being guided by the groove. The landing door shoes 13 and the groove of the landing door sill 14 prevent the landing door panel 8 from moving in the depth direction (Z-axis direction).
The opening and closing operations of the car door panel 1 are performed by a door drive device arranged above the door rail 5 on the car girder 4. The door drive device includes a door motor 15. The door drive device is provided only on the car door side, and is not provided on the landing door side. As illustrated in
Further, a driven wheel 17 is freely rotatably mounted on the other side of the car girder 4 in the horizontal direction. That is, in
Teeth are formed on an inner side of the toothed belt 18 by forming protrusions and recesses at equal intervals. The drive wheel 16 and the driven wheel 17 have protrusions and recesses formed so as to be engaged with those teeth. In this manner, the teeth of the toothed belt 18 are engaged with the protrusions and the recesses of the drive wheel 16 and the driven wheel 17 so that the rotational drive of the door motor 15 is transmitted to the circulation movement of the toothed belt 18. This mechanism is referred as “wrapping transmission mechanism”. As described above, the door drive device for the elevator in the first embodiment constructs a door drive device of the wrapping transmission mechanism.
As illustrated in
Further, a pair of stoppers 20 is provided on the car girder 4. Those stoppers 20 are provided at both ends of the car girder 4 in the horizontal direction, respectively. The stoppers 20 restrict the movement of the car door panel 1 beyond a fully opened position and a fully closed position. Therefore, those stoppers 20 are arranged so that one end portion and another end portion of the car door hanger 2 abut against one of the stoppers 20 when the door panel 1 is in a fully opened state and a fully closed state, respectively.
A full-closure recognition switch 21 is mounted on the car girder 4 at a position above the car door hanger 2. The full-closure recognition switch 21 has a U-shape in cross section. Meanwhile, a blocking plate 22 is mounted on the upper end portion of the car door hanger 2. The blocking plate 22 has an outer shape that is complementary to the inner shape of the U-shape of the full-closure recognition switch 21. At the time of the door closing operation of the car door panel 1, along with the movement of the car door panel 1, the blocking plate 22 is inserted to the inner side of the U-shape of the full-closure recognition switch 21. The blocking plate 22 is arranged so that, when the car door panel 1 is in the fully closed state, the blocking plate 22 is positioned right inside the U-shape of the full-closure recognition switch 21. On the inner side of the full-closure recognition switch 21, a light emitting element and a light receiving element are provided so as to be opposed to each other. When the blocking plate 22 is absent, light emitted from the light emitting element is received by the light receiving element. The full-closure recognition switch 21 detects that, when the light receiving element receives the light, the car door panel 1 is not in the fully closed state. Meanwhile, when the blocking plate 22 is positioned on the inner side of the U-shape of the full-closure recognition switch 21, the light emitted from the light emitting element is blocked by the blocking plate 22, and hence the light is not received by the light receiving element. The full-closure recognition switch 21 detects that, when the light receiving element does not receive the light, the car door panel 1 is in the fully closed state.
In this manner, when the full-closure recognition switch 21 detects that the blocking plate 22 is positioned on the inner side of the U-shape, the full-closure recognition switch 21 outputs a full-closure signal. That is, the full-closure recognition switch 21 constructs a full-closure detection unit configured to detect that the car door panel 1 is located at a full-closure position.
As described above, the door drive device is provided only on the car door side, and is not provided on the landing door side. Specifically, members corresponding to the above-mentioned members 16 to 19 provided on the car doorway side are not provided on the landing doorway side.
Therefore, the landing door panel 8 is also driven by the door drive device provided on the car door panel 1 side. That is, the landing door panel 8 is engaged with the car door panel 1 by an engaging member to be opened and closed in synchronization with the car door panel 1. The engaging member is constructed of engaging vanes 23 and an engaging roller 24 illustrated in
Further, as illustrated in
Further, a shoe switch 27 is provided on the side surface of the car door panel 1 on the landing side. The shoe switch 27 detects that the safety shoe 25 is moved with respect to the car door panel 1 by a distance set in advance in the door opening direction. The shoe switch 27 includes a detecting element. The detecting element of the shoe switch 27 is engaged with the link 26. The shoe switch 27 is configured such that the inner contacts are turned on or off depending on the position of the detecting element. When the safety shoe 25 is urged in the door opening direction, the links 26 rotate counterclockwise in
In the first embodiment, as illustrated in
Next, with reference to
Next, with reference to
To the failure determination unit 33, information from the shoe switch 27, information from the full-closure recognition switch 21, and floor information from an elevator control panel (not shown) are input. The failure determination unit 33 determines whether or not the ON failure or the OFF failure of the safety shoe has occurred based on those signals.
In this case, the shoe switch 27 outputs an ON signal when the shoe switch 27 is in the ON state, and outputs an OFF signal when the shoe switch 27 is in the OFF state. Therefore, the above-mentioned information from the shoe switch 27 is any one of the ON signal and the OFF signal.
Further, the full-closure recognition switch 21 outputs an ON signal when the car door panel 1 is in the fully closed state, and outputs nothing or an OFF signal when the car door panel 1 is not fully closed. The information from the full-closure recognition switch 21 is a signal indicating whether or not the car door panel 1 is fully closed.
Further, the floor signal from the elevator control panel is information indicating on which floor the car is stopping now. The elevator control panel is a device configured to control the operation of the car, and is provided in a machine room provided in an upper portion of the hoistway. The failure determination unit 33 stores in advance in the memory a table for determining whether each floor is the ON-failure detection floor or the OFF-failure detection floor. Therefore, when the information on the stop floor of the car is input from the elevator control panel, it can be determined based on the information whether the stop floor is the ON-failure detection floor or the OFF-failure detection floor.
As illustrated in
In Step S2, the failure determination unit 33 determines whether or not the car door panel 1 is fully closed based on the information from the full-closure recognition switch 21. When the car door panel 1 is fully closed, the processing proceeds to Step S4, and otherwise, the processing proceeds to Step S3.
In Step S3, the failure determination unit 33 determines that the operation of the safety shoe is normal.
In Step S4, the failure determination unit 33 determines based on the floor information from the elevator control panel whether the current stop floor of the car is the OFF-failure detection floor or the ON-failure detection floor. When the current stop floor of the car is the OFF-failure detection floor, the processing proceeds to Step S5, and when the current stop floor of the car is the ON-failure detection floor, the processing proceeds to Step S6.
In Step S5, the failure determination unit 33 determines that the operation of the safety shoe has the OFF failure. On the OFF-failure detection floor, as described above, the failure detection roller 29 is provided, and hence when the car door panel 1 is in the fully closed state, the shoe switch 27 is supposed to be in the ON state. However, in this case, the shoe switch 27 is in the OFF state, and hence the failure determination unit 33 determines that the operation of the safety shoe has the OFF failure.
In Step S6, the failure determination unit 33 determines that the operation of the safety shoe is normal. On the ON-failure detection floor, as described above, the failure detection roller 29 is not provided, and hence the shoe switch 27 is supposed to remain in the OFF state even when the car door panel 1 is in the fully closed state. In this case, the shoe switch 27 is in the OFF state, and hence the failure determination unit 33 determines that the operation of the safety shoe is normal.
In Step S7, the failure determination unit 33 determines based on the information from the full-closure recognition switch 21 whether or not the car door panel 1 is fully closed. When the car door panel 1 is fully closed, the processing proceeds to Step S9, and otherwise, the processing proceeds to Step S8.
In Step S8, the failure determination unit 33 determines that an obstacle is present.
In Step S9, the failure determination unit 33 determines based on the floor information from the elevator control panel whether the current stop floor of the car is the OFF-failure detection floor or the ON-failure detection floor. When the current stop floor of the car is the OFF-failure detection floor, the processing proceeds to Step S10, and when the current stop floor of the car is the ON-failure detection floor, the processing proceeds to Step S11.
In Step S10, the failure determination unit 33 determines that the operation of the safety shoe is normal. On the OFF-failure detection floor, as described above, the failure detection roller 29 is provided, and hence when the car door panel 1 is in the fully closed state, the shoe switch 27 is supposed to be in the ON state. However, in this case, the shoe switch 27 is in the ON state, and hence the failure determination unit 33 determines that the operation of the safety shoe is normal.
In Step S11, the failure determination unit 33 determines that the operation of the safety shoe has the ON failure. On the ON-failure detection floor, as described above, the failure detection roller 29 is not provided, and hence the shoe switch 27 is supposed to remain in the OFF state even when the car door panel 1 is in the fully closed state. In this case, the shoe switch 27 is in the ON state, and hence the failure determination unit 33 determines that the operation of the safety shoe has the ON failure.
As described above, in the first embodiment, the elevator door device includes: the car door panel 1 provided in the doorway of the car of the elevator; the safety shoe 25, which is provided on the leading end portion of the car door panel 1 in the closing direction of the car door panel 1, and is configured to move in the opening and closing directions of the car door; the shoe switch 27, which is provided on the car door panel 1, and is configured to be activated when the safety shoe 25 is moved by a certain distance set in advance in the opening direction of the car door; the full-closure recognition switch 21, which is provided in the doorway of the car, and is configured to detect that the car door is brought into the fully closed state; the failure detection vane 28 coupled to the safety shoe 25; the failure detection roller 29, which is provided on at least one of the landings of the elevator, and is to be brought into contact with the failure detection vane 28 when the car door is brought into the fully closed state to move the safety shoe 25 by a certain distance in the opening direction of the car door; and the failure determination unit 33 configured to determine whether the operation failure of the safety shoe 25 has occurred based on the result of detection by the full-closure recognition switch 21 and on whether the shoe switch 27 is activated when the car has landed on one of the landings of the elevator. The failure determination unit 33 sets a floor of the landing in which the failure detection roller 29 is mounted as the OFF-failure detection floor for detecting the OFF failure of the safety shoe 25, and sets a floor of the landing in which the failure detection roller 29 is not mounted as the ON-failure detection floor for detecting the ON failure of the safety shoe 25. When the car has landed on the OFF-failure detection floor, the failure determination unit 33 detects whether the safety shoe 25 has the OFF failure, and when the car has landed on the ON-failure detection floor, the failure determination unit 33 detects whether the safety shoe 25 has the ON failure. In the first embodiment, the floors of the building are divided into the OFF-failure detection floor and the ON-failure detection floor, the failure detection vane 28 is added to the car, and the failure detection roller 29 is added to the OFF-failure detection floor. With such a simple change in configuration, the OFF failure and the ON failure of the safety shoe can be detected under a state in which the door is fully closed at low cost.
Further, in the first embodiment, when the car lands on the OFF-failure detection floor, in a case where the full-closure recognition switch 21 detects that the car door is located at a fully closed position and the shoe switch 27 is not activated, the failure determination unit 33 determines that the safety shoe 25 has the OFF failure. That is, when the shoe switch 27 is not activated even though the failure detection roller 29 presses the safety shoe 25 through intermediation of the failure detection vane 28, the OFF failure is detected. Therefore, the OFF failure can be detected quickly and reliably.
Further, in the first embodiment, when the car lands on the ON-failure detection floor, in a case where the full-closure recognition switch 21 detects that the car door is located at a fully closed position and the shoe switch 27 is activated, the failure determination unit 33 determines that the safety shoe 25 has the ON failure. That is, the failure detection roller 29 is not provided on the ON-failure detection floor, and hence when the shoe switch 27 is activated even though the safety shoe 25 is not pressed, the ON failure is detected. Therefore, the ON failure can be detected quickly and reliably. In the first embodiment, the ON-failure detection is performed when the door is in the fully closed state, and hence erroneous detection due to human factors is eliminated. Thus, the ON-failure detection can be performed with high accuracy.
Further, in the first embodiment, the bottom floor is set as the OFF-failure detection floor. When the failure detection roller 29 is mounted on a landing lower portion of a floor other than the bottom floor, the failure detection roller 29 and the failure detection vane 28 are brought into contact with each other while the car passes the floor, and thus abnormal noise and breakage may occur. However, in the first embodiment, the failure detection roller 29 is provided on the bottom floor, and hence the abnormal noise and the breakage do not occur. Further, in general, the bottom floor has an entrance of a building, and hence users of the elevator most frequently use the bottom floor. Therefore, the frequency at which the elevator lands on the bottom floor is higher than the frequency at which the elevator lands on other floors. In the first embodiment, only the bottom floor is set as the OFF-failure detection floor, and all of the other floors are set as the ON-failure detection floor, and hence the number of the ON-failure detection floors is greatly larger than the number of the OFF-failure detection floors. However, the bottom floor having a high landing frequency is set as the OFF-failure detection floor, and hence the number of times to execute the OFF-failure detection can be ensured as appropriate.
That is, it is assumed that, as illustrated in
In the second embodiment, the top floor can be set as the OFF-failure detection floor, and hence the second embodiment is effective when, for example, the failure detection roller 29 cannot be mounted on the lower portion of the landing of the bottom floor or when the frequency of landing to the bottom floor is low.
As described above, also in the second embodiment, an effect similar to that of the above-mentioned first embodiment can be obtained. Further, in the second embodiment, the top floor can be set as the OFF-failure detection floor, and hence the second embodiment is effective when, for example, the failure detection roller 29 cannot be mounted on the lower portion of the landing of the bottom floor or when the frequency of landing to the bottom floor is low.
Both of the bottom floor and the top floor can be set as the OFF-failure detection floor. In this case, the failure detection vane 28 is mounted on the upper end of the safety shoe 25, and the failure detection vane 28A is mounted on the lower end of the safety shoe 25. Further, along therewith, the failure detection roller 29 is mounted on the lower portion of the landing of the bottom floor so as to protrude into the hoistway, and the failure detection roller 29A is mounted on the upper portion of the landing of the top floor so as to protrude into the hoistway. The mechanism of failure detection is the same as those in the first embodiment and the second embodiment, and hence the description thereof is omitted herein.
As described above, also in the third embodiment, an effect similar to those in the above-mentioned first and second embodiments can be obtained. Further, in the third embodiment, the bottom floor and the top floor can be set as the OFF-failure detection floor. Therefore, even when the frequency of landing to the bottom floor and the top floor is low, the OFF-failure detection can be performed on both of the bottom floor and the top floor, and hence reduction in frequency of executing the OFF-failure detection can be prevented.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2016/065015 | 5/20/2016 | WO | 00 |
