Automatic testing device for elevator limit switch distance and buffer distance

Abstract

The utility model discloses an elevator limit switch distance and buffer distance automatic testing device which comprises a traction machine (10) which is arranged at the upper end of an elevator shaft and provided with an encoder, a traction wheel (1) is arranged on the traction machine (10), a guide wheel (2) is arranged on one side of the traction wheel (1), a traction rope (3) is arranged on the traction wheel (1) and the guide wheel (2), and the traction rope (3) is connected with the traction machine (10). An elevator car (4) and an elevator counterweight (5) are arranged at the two ends of the traction rope (3) respectively, a car buffer (6) corresponding to the elevator car (4) and a counterweight buffer (7) corresponding to the elevator counterweight (5) are arranged at the lower end of the elevator shaft, a limit switch (8) is arranged on one side of the elevator car (4), and a collision bow (9) corresponding to the limit switch (8) is arranged on the upper side and the lower side of the side wall of the shaft. The device can be used for automatically testing the distance, and is accurate in detection and low in cost.

Description

Technical Field

[0001] The utility model relates to an automatic testing device, in particular to an automatic testing device for the limit switch distance and buffer distance of an elevator. Background Art

[0002] As a device that we often use in our daily lives, the safety of elevators is self-evident. They must be equipped with limit limit devices and buffers. In the "TSGT7001-2023 Elevator Supervision Inspection and Periodic Inspection Rules", A1.2.2.17 Buffers are checked to see if they meet the following requirements: (4) When the car is at the top terminal leveling position, the distance between the counterweight device collision plate and the top surface of its buffer does not exceed the maximum allowable value marked on the counterweight overtravel distance mark; A1.2.2.18 Limit position limit device, check whether the limit position limit device can function before the car (carrier) or counterweight contacts the buffer or before the plunger contacts the buffer stop device, and whether it can maintain its function while the buffer is compressed or the plunger is in the buffer stop area. In order to confirm whether the buffer and limit device are installed correctly, manufacturers generally need to measure the installation position of the limit device and the buffer distance during factory inspection. For example, the patent application number 202311254571.3 discloses an elevator limit switch inspection method and an audio-visual recording device, which uses a binocular camera to collect image information for distance measurement, which not only increases the cost, but is also easily affected by light, dust, etc. in the shaft, resulting in a decrease in accuracy. Utility Model Content

[0003] The purpose of the utility model is to provide an automatic testing device for the distance of an elevator limit switch and a buffer, which can be used to realize automatic distance testing with accurate detection and low cost.

[0004] The technical solution of the utility model is as follows: an automatic testing device for the limit switch distance and buffer distance of an elevator, comprising a traction machine provided at the upper end of an elevator shaft and equipped with an encoder, a traction wheel being provided on the traction machine, a guide wheel being provided on one side of the traction wheel, a traction rope being provided on the traction wheel and the guide wheel, an elevator car and an elevator counterweight being provided at both ends of the traction rope, a car buffer corresponding to the elevator car and a counterweight buffer corresponding to the elevator counterweight being provided at the lower end of the elevator shaft, a limit switch being provided on one side of the elevator car, collision bows corresponding to the limit switches being provided on the upper and lower sides of the side walls of the shaft, a car top control panel for collecting limit switch trigger signals being provided on the upper side of the elevator car, and a control main panel for collecting encoder, car buffer, counterweight buffer and car top control panel signals being provided on one side of the car top control panel.

[0005] In the aforementioned automatic testing device for the elevator limit switch distance and buffer distance, the impact bow includes a support plate fixedly installed in the elevator shaft, two groups of horizontal and parallel sleeve rods are provided on one side of the support plate, and the sleeve rods are provided with mounting rods that can move relative to the sleeve rods. The end of the mounting rod is provided with a striker corresponding to the limit switch, and the support plate is provided with a vertically arranged slide groove located between the two groups of sleeve rods. The slide groove is provided with two groups of sliders symmetrically arranged with respect to the center plane of the slide groove, and the two groups of sliders are provided with spring pieces that abut against the inner side of the striker.

[0006] Compared with the existing technology, the utility model uses the encoder in the traction machine to measure the movement distance of the elevator car and the elevator counterweight to trigger the limit switch, the car buffer and the counterweight buffer during the movement. Further, the inspection personnel can judge whether the buffer and the limit device are installed correctly based on the distance data. In this way, automatic distance testing can be achieved without the need for external detection equipment, which not only saves costs but also has higher accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a structural diagram of the utility model;

[0008] Figure 2 It is a structural diagram of the impact bow of the utility model;

[0009] Figure 3 This is a schematic diagram of the utility model's elevator car upward detection;

[0010] Figure 4 It is a schematic diagram of the utility model of the elevator car downward detection.

[0011] The marks in the accompanying drawings are: 1-traction sheave, 2-guide sheave, 3-traction rope, 4-elevator car, 5-elevator counterweight, 6-car buffer, 7-counterweight buffer, 8-limit switch, 9-strike bow, 10-traction machine, 12-support plate, 13-sleeve rod, 15-mounting rod, 16-strike plate, 17-chute, 18-slider, 19-spring, 20-car top control panel. DETAILED DESCRIPTION

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0013] Embodiment. An automatic testing device for elevator limit switch distance and buffer distance, comprising: Figure 1-3As shown, it includes a traction machine 10 provided at the upper end of the elevator shaft and with an encoder, a traction sheave 1 is provided on the traction machine 10, a guide sheave 2 is provided on one side of the traction sheave 1, a traction rope 3 is provided on the traction sheave 1 and the guide sheave 2, an elevator car 4 and an elevator counterweight 5 are provided at both ends of the traction rope 3, a car buffer 6 corresponding to the elevator car 4 and a counterweight buffer 7 corresponding to the elevator counterweight 5 are provided at the lower end of the elevator shaft, a limit switch 8 is provided on one side of the elevator car 4, and a striker bow 9 corresponding to the limit switch 8 is provided on the upper and lower sides of the shaft side walls, a car top control panel 20 for collecting the trigger signal of the limit switch 8 is provided on the upper side of the elevator car 4, and a control main board for collecting signals of the encoder, the car buffer 6, the counterweight buffer 7 and the car top control panel 20 is provided on one side of the car top control panel 20.

[0014] The striking bow 9 includes a support plate 12 fixedly installed in the elevator shaft, and two groups of horizontal and parallel sleeve rods 13 are provided on one side of the support plate 12. The sleeve rod 13 is provided with a mounting rod 15 that can move relative to the sleeve rod 13, and the end of the mounting rod 15 is provided with a striking piece 16 corresponding to the limit switch 8. A vertical slide 17 is provided in the support plate 12 and located between the two groups of sleeve rods 13. The slide 17 is provided with two groups of sliders 18 symmetrically arranged with respect to the center plane of the slide 17, and the two groups of sliders 18 are provided with spring pieces 19 that abut against the inner side of the striking piece 16.

[0015] Principle of the present utility model: This application is used to detect the installation position of the car buffer 6, the counterweight buffer 7, the impact bow 9 and the limit switch 8. This application adopts a traction machine 10 with an encoder as a driving mechanism, such as the traction machine with an encoder disclosed in patents with application numbers 202110423816.5 and 200410066305.9, and realizes the measurement of the movement distance through the encoder. This application records the elevator reaching the top level as the initial position, so that the traction machine 10 drives the elevator car 4 and the elevator counterweight 5 to move. If the elevator car 4 moves upward first, during the upward movement of the elevator car 4, the limit switch 8 will first contact the impact bow 9, generating an upper limit signal, and the car top control board 20 transmits the signal to the control main board through the CAN transmission method, that is, the safety bus method. The control main board records the encoder signal at this time. The car top control board is the GCECCBS board, and the control main board is the GCECPU. The elevator car 4 will continue to move upward under the action of the traction machine 10 until the elevator counterweight 5 triggers the counterweight buffer 7. The control main board records the encoder signal at this time. The control main board is set in the elevator control cabinet to collect signals from the encoder, car buffer 6, counterweight buffer 7 and car top control board 20. If the encoder of the present application is a pulse encoder, the diameter D of the traction wheel is calculated, then the circumference L of the traction wheel 1 is πD, and the encoder pulse P when the traction wheel 1 rotates one circle, then the length of each pulse is πD / P, and the movement distance of the wire rope is calculated by the number of pulses of the encoder signal and the length of each pulse. For example, when the limit switch 8 hits the collision bow 9 to generate an upper limit signal, the signal is collected by the car top control board and transmitted to the control main board. The encoder pulse signal recorded by the control main board is compared with the encoder pulse signal when the elevator reaches the top floor to calculate the current movement distance, that is, the upper limit distance, recorded as S1; the motor car continues to move upward until the elevator counterweight 5 triggers the counterweight buffer 7, and the control board records the encoder signal at this time, and compares it with the encoder pulse signal when the elevator reaches the top floor to calculate the current movement distance, that is, the counterweight buffer switch distance, recorded as S2. Similarly, when the elevator car reaches the bottom leveling position, it is the initial position. The elevator car 4 is driven downward by the traction machine 10. When the limit switch on the elevator car 4 triggers the collision bow 9, the signal is collected through the car top control board and transmitted to the control main board. The encoder pulse signal at this time is recorded and compared with the pulse signal when the elevator car reaches the bottom leveling position to calculate the current movement distance, that is, the lower limit distance, recorded as S3; the elevator car continues to move downward until the elevator car 4 triggers the car buffer 6. The control board records the encoder signal at this time and compares it with the encoder pulse signal when the elevator reaches the bottom leveling position to calculate the current movement distance, that is, the car buffer switch distance, recorded as S4. In this way, the distance moved by the limit switch, car buffer and counterweight buffer triggered during the movement of the elevator car and the elevator counterweight can be realized without the need for external distance measuring equipment, which not only saves costs but also has accurate distance measurement.During the distance detection process, the limit switch 8 will collide with the collision bow 9, causing the collision bow 9 to be damaged. The present application improves the collision bow to reduce the impact on the collision bow. During the operation of the elevator car, the limit switch will collide with the collision plate, causing an impact on the collision plate. At this time, the collision plate will squeeze the spring 19 provided on one side of the collision plate 16, and the spring 19 will be deformed, buffering the collision plate. In order to ensure that the limit switch can be accurately triggered, the limit switch is moved outward so that the spring 19 is deformed and causes the pressing slider 18 to move to the two ends of the slide groove 17, that is, when the spring is at the maximum change, the limit switch is just in the triggered state. This ensures that when the limit switch hits the collision bow, the limit switch can operate normally. The collision bow of the present application solves the problem that the elevator collision bow is easily damaged, which causes the elevator to easily malfunction, while ensuring that the limit switch can operate normally, thereby increasing the service life of the elevator.

Claims

1. An automatic testing device for elevator limit switch distance and buffer distance, characterized by: The invention comprises a traction machine (10) provided at the upper end of an elevator shaft and provided with an encoder, wherein the traction machine (10) is provided with a traction wheel (1), a guide wheel (2) is provided on one side of the traction wheel (1), a traction rope (3) is provided on the traction wheel (1) and the guide wheel (2), an elevator car (4) and an elevator counterweight (5) are provided at both ends of the traction rope (3), a car buffer (6) corresponding to the elevator car (4) and a counterweight buffer (7) corresponding to the elevator counterweight (5) are provided at the lower end of the elevator shaft, a limit switch (8) is provided on one side of the elevator car (4), a striker (9) corresponding to the limit switch (8) is provided on the upper and lower sides of the shaft side wall, a car top control panel (20) for collecting trigger signals of the limit switch (8) is provided on the upper side of the elevator car (4), and a control main board for collecting signals of the encoder, the car buffer (6), the counterweight buffer (7) and the car top control panel (20) is provided on one side of the car top control panel (20).

2. The automatic testing device for elevator limit switch distance and buffer distance according to claim 1, characterized in that: The striking bow (9) comprises a support plate (12) fixedly mounted on the elevator shaft, two groups of sleeve rods (13) arranged horizontally and in parallel are provided on one side of the support plate (12), a mounting rod (15) movable relative to the sleeve rod (13) is provided in the sleeve rod (13), a striking piece (16) corresponding to the limit switch (8) is provided at the end of the mounting rod (15), a vertically arranged chute (17) located between the two groups of sleeve rods (13) is provided in the support plate (12), two groups of sliders (18) arranged symmetrically with respect to the center plane of the chute (17) are provided in the chute (17), and spring pieces (19) abutting against the inner side of the striking piece (16) are provided on the two groups of sliders (18).

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