JPH04365765A - Device for testing limit switch of elevator - Google Patents

Abstract

PURPOSE:To provide a device for testing a limit switch of an elevator whereby high accurate testing of action of the limit switch can be easily and efficiently performed by bringing a cam into contact with a lever in a condition approximate to the actual action. CONSTITUTION:A testing cam 11, movable to a position of actuating limit switches 6a to 6d, is provided as a separate unit from a cam 8 in a riding cage position in the vicinity of upper and lower end parts of a lift path internal wall, in a riding cage 2, or a limit switch actuating cam 30, concurrently serving as a testing cam, is provided. Thus by eliminating necessity for human hand, an action test of the limit switch can be accurately and efficiently performed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator limit switch testing device for testing the operation of limit switches provided near the upper and lower ends of the inner wall of an elevator hoistway.

0002

[Prior Art] In order to prevent an elevator car from rising too high at the upper end of the hoistway and causing a push-up accident, or falling too far at the lower end of the hoistway and causing a push-up accident, A limit switch is provided on the inner wall near the upper end and near the lower end, respectively. FIG. 4 is an explanatory diagram showing the overall structure of an elevator to explain the elevator limit switch.
is a hoistway, in which limit switches 6a and 6b each having an operating lever 7 are provided near the upper end of the inner wall of the hoistway 1, and an operating lever 7 is similarly provided near the lower end of the inner wall of the hoistway 1. Limit switches 6c and 6d are provided. By their operation, these limit switches
Each has a function of disconnecting an upward drive circuit and a downward drive circuit for car operation, the limit switch 6b has a function of disconnecting the upward drive circuit, the limit switch 6c has a function of disconnecting the downward drive circuit, and the limit switches 6a, 6
d has a disconnection function for the ascending drive circuit and the descending drive circuit.

A buffer spring 5 is fixed to the bottom of the hoistway 1, and a machine room 1a is provided above the hoistway 1.
A groove wheel 3 of a hoist (not shown) is arranged in the machine room 1a, and a car 2 equipped with a cam 8 is fixed to one end of a wire 35 suspended from the groove wheel 3. A counterweight 4 is fixed to the other end of the wire 35 which is suspended from the deflection wheel 3a.

[0004] In such an elevator, when the car 2 rises beyond the normal stopping position of the top floor, the car 2
The cam 8 contacts the operating lever 7, the limit switch 6b is activated, and the lift drive circuit for the car 2 is disconnected.
Climbing operation of the car 2 is prohibited, and an accident of the car 2 being pushed up is prevented. Furthermore, when the car 2 descends beyond the normal stopping position of the lowest floor, the cam 8 of the car 2 contacts the operating lever 7, the limit switch 6c is activated, and the lowering drive circuit of the car 2 is disconnected. , the downward movement of the car 2 is prohibited, thereby preventing an accident of the car 2 being pushed up. Even if a situation occurs in which the upward drive circuit or downward drive circuit is not disconnected due to the operation of the limit switches 6b and 6c, when the cam 8 comes into contact with the limit switch 6a or limit switch 6d, the upward drive circuit and the downward drive circuit will be disconnected at the same time. As a result, the elevator is put out of operation, so that the occurrence of an accident in which the car 2 is pushed up or pushed down is completely prevented.

Limit switch 6a operating in this manner
-6d are required to always operate normally in order to prevent uplift accidents and push-down accidents, and therefore regular inspection work is required to ensure normal operation. Previously, workers entered the hoistway and turned the levers on each limit switch.
The operator operated the switch manually to check whether the switch was operating normally.

[0006]

[Problems to be Solved by the Invention] In the conventional elevator limit switch testing method described above, the work performed by the worker entering the hoistway is complicated, requires considerable time and effort, and it is difficult to carry out the work after the work is completed. Cleaning work was also required to remove the dirt, which caused problems in terms of work costs. Further, although it is possible to test the individual operation of each of the limit switches 6a to 6d, there is a drawback in that it is not possible to test the operation when the operating cam is actually in contact with the lever of the limit switches 6a to 6d.

The present invention was made in view of the current state of operation testing of this type of limit switch as described above, and its purpose is to test a limit switch based on contact between a cam and a lever in a state that approximates actual operation. To provide a test device for an elevator limit switch, which can efficiently test the operation with simple work.

[0008]

[Means for Solving the Problems] The above object is operated by cams provided near the upper end and near the lower end of the inner wall of the hoistway, respectively, and attached to the elevator car. In an elevator limit switch testing device for testing the operation of a limit switch that suppresses the movement of a car, the limit switch can be freely moved to an operating position that coincides with the cam surface of the cam near the upper and lower ends of the inner wall of the hoistway. This is achieved by adopting the first configuration in which a cam is provided.

[0009] Further, the above object is operated by cams provided near the upper end and near the lower end of the inner wall of the hoistway and attached to the elevator car, and the movement of the car is caused by the operation of the cams. In an elevator limit switch testing device for performing an operation test of a limit switch in which the limit switch is suppressed, during the operation test, the cam is operated to operate the limit switch at a car position near the upper end and the lower end of the inner wall of the hoistway. This is achieved by adopting a second configuration in which displacement means are provided for respectively displacing the two positions.

0010

[Operation] According to the first configuration, when testing the operation of the limit switch, the test cam is moved near the upper and lower ends of the inner wall of the hoistway to an operating position that coincides with the cam surface of the cam of the car. Touch the test cam to the limit switch operating lever. Then, a test is conducted to confirm that the limit switch is activated by contact between the test cam and the limit switch operating lever, thereby suppressing the movement of the car.

According to the second configuration, when testing the operation of the limit switch, at a position of the car near the upper end of the inner wall of the hoistway, the displacement means displaces the cam of the car upward to a position where the limit switch is actuated. do. Further, at a position of the car near the lower end of the inner wall of the hoistway, the displacement means displaces the cam of the car downward to a position where the limit switch is actuated. In this way, the cam of the car is brought into contact with the operating lever of the limit switch at a position of the car near the upper and lower ends of the inner wall of the hoistway,
Test to confirm that movement of the car is suppressed by activating the limit switch.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to FIGS. 1 to 3. Here, FIG. 1 is an explanatory diagram showing the configuration of the first embodiment, FIG. 2 is an explanatory diagram showing the configuration of the second embodiment,
FIG. 3 is an explanatory diagram showing the configuration of the third embodiment, and the same parts as those in FIG. 4 already described are given the same reference numerals.

As shown in FIG. 1, in the first embodiment, a solenoid 12 is fixed to the top surface of the car 2, and a test cam 11 is attached to the movable core 13 of the solenoid 12. When the test cam 11 is excited, the test cam 11 moves to the left in the figure until the cam surface coincides with the operating cam 8 fixed to the car 2. Similarly, a solenoid 12 is fixed to the underside of the car 2, and a test cam 11 is attached to the movable core 13 of the solenoid 12. When the solenoid 12 is energized, the test cam 11 is activated as shown in the figure. It moves to the left until it reaches a position where the operating cam surface fixed to the car 2 is aligned. on the other hand,
The first embodiment includes a limit switch operation test control device 1.
Limit switches 6a to 6d (limit switches 6c and 6d are not shown in FIG. 1) are connected to the input terminals of the limit switch operation test control apparatus 10. Each solenoid 12 is connected to the output terminal of. The configuration of other parts of the first embodiment is already shown in FIG.
This is the same as the elevator explained in .

Next, the operation of the first embodiment having such a configuration will be explained.

First, in order to test the operation of the limit switches 6a and 6b provided near the upper end of the inner wall of the hoistway, the test cam 11 is retracted by a command signal from the limit switch operation test control device 10. In this state, the car 2 is operated upward, and near the upper end of the inner wall of the hoistway,
The test cam 11 is positioned opposite the limit switch 6b to stop the car 2. At this stop position, the solenoid 12 is energized by a command signal from the limit switch operation test control device 10, so the test cam 11 protrudes and comes into contact with the operating lever 7 of the limit switch 6b, thereby operating the limit switch 6b. When it is confirmed that the upward drive circuit of the car 2 is not formed and the downward drive circuit is formed due to the operation of the limit switch 6b, the limit switch operation test control device 10 returns the limit switch 6b to the normal operating state. It is determined that there is. Next, the limit switch operation test control device 10
With the test cam 11 retracted, the car 2 is operated upward in response to a command signal from the test cam 11, and the test cam 11 is positioned opposite the limit switch 6a near the upper end of the inner wall of the hoistway. Stop car 2. At this stop position, the solenoid 12 is energized by a command signal from the limit switch operation test control device 10, so the test cam 11 protrudes and comes into contact with the operating lever 7 of the limit switch 6a, thereby operating the limit switch 6a. By the operation of this limit switch 6a, the car 2
When it is confirmed that the entire drive circuit including the up drive circuit and the down drive circuit is not formed, the limit switch operation test control device 10 controls the limit switch 6a.
is determined to be in normal operating condition.

Although not shown in FIG. 1, there is a limit switch (6 in FIG. 4) provided near the lower end of the inner wall of the hoistway.
C, 6D) are also tested in the same manner. As described above, according to the first embodiment, there is no need for the worker to enter the hoistway and perform complicated work for a long time, and the test cam 11 can be easily operated to approximate the operation of the actual limit switches 6a to 6d. By the contact operation between the limit switch and the operating lever 7, a highly accurate limit switch operation test can be performed.

In the second embodiment shown in FIG.
Two links 20 are provided so as to be rotatable about a shaft 21, with one end protruding from the upper and lower surfaces of the car 2, respectively, and one end of each link 20 is rotatably attached to the test cam 11. It is attached freely. The other ends of these links 20 are rotatably attached to a movable core 13 of a common solenoid 12 fixed to the car 2. When the solenoid 12 is energized, the movable iron core moves to the right in the figure, the link 20 rotates around the shaft 21, the test cam 11 moves to the left in the figure, and the car 2 The cam surface is moved to a position where the cam surface matches the operating cam 8 fixed to the cam surface. The configuration of other parts of the second embodiment is the same as that of the first embodiment already described.

In the second embodiment having such a configuration, the car 2 is moved to the vicinity of the upper end of the inner wall of the hoistway, and the test cam 11 protruding from the top surface of the car 2 is used to test the car. , the limit switches 6a, 6b are tested for operation as already explained in the first embodiment. Similarly,
The car 2 is moved to the vicinity of the lower end of the inner wall of the hoistway, and the test cam 11 protruding from the lower surface of the car 2 is used to activate the limit switches 6c and 6d, which are not shown in FIG. Perform an operation test.

In this second embodiment, manufacturing costs can be reduced by reducing the number of parts by using only one solenoid 12. Other operations and effects of the second embodiment are the same as those of the first embodiment already described.

In the third embodiment shown in FIG. 3, limit switches 6a to 6d (in the figure, limit switches 6c and 6
d is omitted from the illustration), a drive gear 31 driven by a motor on the wall of the car 2 facing the
A movable cam 30 for actuating a limit switch is attached which can be moved up and down in the figure by the drive of 1. When the drive gear 31 is rotated clockwise by the motor, the limit switch operating movable cam 30 moves upward in the figure, and when the drive gear 31 rotates counterclockwise, the limit switch operating movable cam 30 moves upward in the figure. In the third embodiment, both ends of the limit switch operating movable cam 30 are configured to be used as test cams. On the other hand, the third embodiment is provided with a limit switch operation test control device 10, and the input terminals of this limit switch operation test control device 10 are connected to limit switches 6a to 6d (limit switches 6c and 6d are not shown in the figure). A motor for driving a drive gear 31 is connected to the output terminal of the limit switch operation test control device 10. The configuration of other parts of the third embodiment is the same as that of the already described first embodiment.

Next, the operation of the third embodiment having such a configuration will be explained.

First, when testing the operation of the limit switches 6a and 6b, the limit switch operation test control device 1
0 command signal, after the car 2 moves and stops near the normal stop position on the top floor, the motor is driven to shift the drive gear 3.
1 in the clockwise direction to move the limit switch actuating movable cam 30 upward a predetermined distance. When the limit switch 6b is activated in this state and it is confirmed that the upward drive circuit is not formed but the downward drive circuit is formed, the limit switch operation test control device 10 determines that the limit switch 6b is normal. Next, the limit switch 6a is further activated by a command signal from the limit switch operation control device 10 for a predetermined distance, and when it is confirmed that the entire circuit including the up drive circuit and the down drive circuit is not formed, the limit switch operation test control circuit 10 is activated. Therefore, it is determined that the limit switch 6a is normal.

Limit switches 6c, not shown in FIG.
In the operation test 6d, in the same manner, the car 2 is moved and stopped near the normal stop position on the lowest floor according to a command signal from the limit switch operation test control device 10, and then the motor is driven to rotate the drive gear 31 in the counterclockwise direction. This is done by rotating the limit switch and moving the limit switch operating movable cam 30 downward a predetermined distance. In this case, limit switch 6
After confirming that the lower drive circuit is not formed by the operation of step c and the higher drive circuit is formed, and that the entire drive circuit including the lower drive circuit and the lower drive circuit is not formed by the operation of the limit switch 6d, the limit switch operation test control device is 10
determines that the limit switches 6c and 6d are normal. The third embodiment uses a motor and a drive gear 31 without using a solenoid, so the structure is simple and compact, and it is advantageous in terms of manufacturing cost. Other operations and effects of the third embodiment are the same as those of the first embodiment already described.

[0024]

Effects of the Invention As described in detail above, in the invention as claimed in claim 1, the elevator car moves to the operating position that coincides with the cam surface of the cam provided on the car near the upper end and the lower end of the inner wall of the hoistway. Since the test cam is equipped with a flexible test cam, the operator does not have to enter the hoistway and perform complicated work.The test cam can be easily operated by contact movement between the test cam and the operating lever, which approximates the operation of an actual limit switch. , it is possible to perform highly accurate limit switch operation tests. Further, in the invention as set forth in claim 4, a displacement means is provided for displacing a cam provided on the car to a position where it contacts the limit switch at a car position near an upper end and a lower end of an inner wall of the hoistway. Therefore, in addition to the effects obtained by the invention according to claim 1, the number of parts can be reduced, the structure can be simplified, and manufacturing costs can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the configuration of a second embodiment of the present invention.

FIG. 3 is an explanatory diagram showing the configuration of a third embodiment of the present invention.

FIG. 4 is an explanatory diagram showing the overall structure of an elevator for explaining a limit switch.

[Explanation of symbols]

1 Hoistway 2 Cars 6a to 6d Limit switch 7 Operating lever 8 Cam 10 Limit switch operation test control device 11 Test cam 12 Solenoid 13 Movable iron core 20 Link 21 Shaft 30 Movable cam for limit switch operation 31 Drive gear

Claims (4)

[Claims] Claim 1: The cams are provided near the upper end and near the lower end of the inner wall of the hoistway, and are operated by cams attached to the elevator car, and the movement of the car is suppressed by the operation thereof. A testing device for an elevator limit switch for testing the operation of a limit switch, characterized in that a test cam is provided near the upper end and the lower end of the inner wall of the hoistway and is movable to an operating position that coincides with the cam surface of the cam. Elevator limit switch testing equipment. 2. Two test cams are provided corresponding to a limit switch near the upper end of the inner wall of the hoistway and a limit switch near the lower end of the inner wall of the hoistway, and a solenoid for moving each limit switch to an operating position is provided, respectively. 2. The elevator limit switch testing device according to claim 1, wherein the testing device is provided corresponding to the testing cam of the elevator limit switch. 3. Two test cams are provided corresponding to a limit switch near the upper end of the shaft inner wall and a limit switch near the lower end of the shaft inner wall, and a common test cam is provided to move each test cam to the operating position. 2. The elevator limit switch testing device according to claim 1, further comprising a solenoid. 4. The cams are provided near the upper end and near the lower end of the inner wall of the hoistway and are actuated by cams attached to the elevator car, and the movement of the car is suppressed by the operation thereof. In an elevator limit switch testing device for testing the operation of a limit switch, during the operation test, the cam is displaced to a position where the limit switch is actuated at a car position near the upper end and near the lower end of the inner wall of the hoistway. 1. A test device for an elevator limit switch, characterized in that it has a displacement means for moving a limit switch.