A PLC-controlled elevator overspeed protection system

Abstract

This utility model discloses a PLC-controlled elevator overspeed protection system, comprising: a drive module including a drive motor, the drive motor including a motor speed monitoring module for monitoring the speed of the drive motor; a speed limiting module including a speed limiter, the speed limiter including an elevator speed monitoring module for monitoring the speed of the elevator car; a friction wheel mounted on the housing of the speed limiter, the friction wheel abutting against the speed limiting wheel of the speed limiter, a speed sensor provided on one side of the friction wheel to monitor the speed of the friction wheel; and a control module, wherein the drive module, the speed limiting module, and the speed sensor are all electrically connected to the control module. This utility model monitors the speed of the elevator car in real time through three means: the motor speed monitoring module, the elevator speed monitoring module, and the speed sensor, which can greatly provide redundancy in elevator car speed monitoring.

Description

Technical Field

[0001] This utility model belongs to the field of elevator technology, specifically a PLC-controlled elevator overspeed protection system. Background Technology

[0002] For a long time, miners have relied on cages or hoists to ascend and descend vertically into the mine. In recent years, mine elevators, as an important auxiliary device for hoisting underground personnel, have gradually gained attention.

[0003] Underground elevators operate in harsh environments, leading to shorter lifespans and higher failure rates for elevator components. Currently, elevators typically monitor speed using a speed governor, a device that limits overspeed. When the car exceeds its speed during upward or downward travel, an electrical switch stops the elevator. If the elevator exceeds its speed during downward travel, and the electrical switch fails to stop it, exceeding 115% of the rated speed, the speed governor mechanically activates, clamping the governor rope with clamps. As the car descends, the governor rope pulls the safety gear linkage mechanism, causing it to engage and contact the safety gear braking elements with the guide rails. This simultaneously clamps the safety gears on both sides of the guide rails, bringing the car to a stop.

[0004] When elevators are used in mines, the speed is monitored solely by the speed governor. If the speed governor's built-in elevator speed monitoring module malfunctions, the elevator speed cannot be monitored in real time, resulting in insufficient redundancy in speed monitoring. Utility Model Content

[0005] The purpose of this invention is to provide a PLC-controlled elevator overspeed protection system to solve at least one of the above-mentioned technical problems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A PLC-controlled elevator overspeed protection system includes:

[0008] A drive module includes a drive motor, and the drive motor includes a motor speed monitoring module for monitoring the speed of the drive motor;

[0009] A speed limiting module includes a speed limiter, wherein the speed limiter includes an elevator speed monitoring module for monitoring the speed of the elevator car;

[0010] A friction wheel is mounted on the housing of the speed limiter, and the friction wheel abuts against the speed limiting wheel of the speed limiter so that the speed limiting wheel of the speed limiter drives the friction wheel to rotate. A speed sensor is provided on one side of the friction wheel to monitor the speed of the friction wheel.

[0011] The control module, the drive module, the speed limiting module, and the speed sensor are all electrically connected to the control module.

[0012] This utility model uses a control module to control the operation of the elevator and a drive module to drive the elevator car's movement. Specifically, a drive motor drives the elevator car, and a motor speed monitoring module on the drive motor monitors the motor speed, which corresponds to the elevator car's speed. The motor speed monitoring module is electrically connected to the control module, which calculates the elevator car's speed based on the drive motor's speed to determine if the elevator car is overspeeding. A speed limiting module is used to limit the elevator car's speed when it is overspeeding. Specifically, a speed limiter protects the elevator car's speed, and an elevator speed monitoring module on the speed limiter monitors the elevator car's speed. A friction wheel is also included. The speed sensor is used to monitor the rotational speed of the speed limiter wheel, thereby monitoring the speed of the elevator car and determining whether the elevator car is overspeeding. This invention monitors the elevator car speed in real time through three methods: a motor speed monitoring module, an elevator speed monitoring module, and a speed sensor. This greatly provides redundancy in elevator car speed monitoring. As long as these three methods do not fail simultaneously, it will not affect the monitoring of the car speed. If one or two of these three car speed monitoring methods fail or are inaccurate, they can be detected and repaired in time. When the elevator car is found to be overspeeding, the control module can promptly control the drive module and the speed limiter module to react and reduce the car speed. For example, when overspeeding occurs, the drive motor of the drive module can stop driving the elevator car, and the speed limiter can apply emergency braking.

[0013] Furthermore, the speed limiter has two mounting plates on its housing, and the speed limiting wheel of the speed limiter is located between the two mounting plates. A rotating shaft is rotatably mounted between the two mounting plates via a bearing, and the friction wheel is mounted on the rotating shaft. The mounting plates and rotating shaft are used to mount the friction wheel.

[0014] Furthermore, the length direction of the rotating shaft is parallel to the axial direction of the speed limiter wheel, so that the speed limiter wheel can drive the friction wheel to rotate through friction.

[0015] Furthermore, the speed sensor is a photoelectric tachometer, which is used to monitor the speed of the elevator car.

[0016] Furthermore, a Hall sensor is installed on the housing of the speed limiter, and a magnet corresponding to the position of the Hall sensor is installed on the speed limiter wheel. The Hall sensor is electrically connected to the control module. Each time the speed limiter wheel rotates once, the magnet passes through the sensing area of ​​the Hall sensor, thereby enabling the Hall sensor to monitor the rotational speed of the speed limiter wheel. Since the rotational speed of the speed limiter wheel corresponds to the speed of the elevator car, the Hall sensor can monitor the speed of the elevator car, thereby further improving the redundancy of elevator car speed monitoring.

[0017] Furthermore, it also includes a control cabinet, in which the control module is installed. The control cabinet is used to install electrical equipment such as the control module.

[0018] Furthermore, it also includes a display module for displaying the elevator speed. The display module is installed on the cabinet door of the control cabinet and is electrically connected to the control module. Through the display module, maintenance and debugging personnel can observe the elevator car speed detected by various means in real time.

[0019] Furthermore, it also includes an alarm module, which is electrically connected to the control module. The alarm module can trigger an alarm when the elevator car is speeding.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This invention utilizes a control module to control elevator operation and a drive module to drive the elevator car's movement. Specifically, a drive motor drives the elevator car, and a motor speed monitoring module on the drive motor monitors its speed. The drive motor speed corresponds to the elevator car's speed. The motor speed monitoring module is electrically connected to the control module, which calculates the elevator car's speed based on the drive motor's speed to determine if the elevator car is overspeeding. A speed limiting module limits the elevator car's speed when it is overspeeding. Specifically, a speed limiter protects the elevator car's speed, and an elevator speed monitoring module on the speed limiter monitors the elevator car's speed. A friction wheel, in conjunction with a speed sensor, further enhances the elevator's performance. The device monitors the rotational speed of the speed limiter wheel, thereby monitoring the elevator car's speed and determining whether the elevator car is overspeeding. This invention monitors the elevator car's speed in real time through three methods: a motor speed monitoring module, an elevator speed monitoring module, and a speed sensor. This greatly provides redundancy in elevator car speed monitoring. As long as these three methods do not fail simultaneously, it will not affect the monitoring of the car's speed. If one or two of these three car speed monitoring methods fail or are inaccurate, they can be detected and repaired in time. When the elevator car is detected to be overspeeding, the control module can promptly control the drive module and the speed limiter module to react and reduce the car's speed. For example, when overspeeding occurs, the drive motor of the drive module can stop driving the elevator car, and the speed limiter can apply emergency braking to achieve overspeed protection. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a PLC-controlled elevator overspeed protection system in this embodiment;

[0023] Figure 2 This is a diagram showing the positional relationship between the friction wheel and the speed limiter in this embodiment;

[0024] In the diagram: 1. Control module; 2. Drive module; 3. Speed ​​limiting module; 4. Speed ​​sensor; 5. Hall sensor; 6. Display module; 7. Alarm module; 8. Housing; 9. Speed ​​limiting wheel; 10. Friction wheel; 11. Mounting plate; 12. Shaft; 13. Magnet. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] like Figure 1 and Figure 2 As shown, this embodiment provides a PLC-controlled elevator overspeed protection system, including:

[0027] The drive module 2 includes a drive motor, and the drive motor includes a motor speed monitoring module for monitoring the speed of the drive motor. In this embodiment, the drive motor may be a traction motor, and the motor speed monitoring module may be a module built into the traction motor for monitoring the speed of the traction motor.

[0028] Speed ​​limiting module 3 includes a speed limiter, which includes an elevator speed monitoring module for monitoring the speed of the elevator car; in this embodiment, the elevator speed monitoring module can be a module integrated into the speed limiter for monitoring elevator speed.

[0029] Friction wheel 10 is mounted on the housing 8 of the speed limiter, and the friction wheel 10 abuts against the speed limiting wheel 9 of the speed limiter so that the speed limiting wheel 9 of the speed limiter drives the friction wheel 10 to rotate. A speed sensor 4 is provided on one side of the friction wheel 10 to monitor the speed of the friction wheel 10.

[0030] The control module 1, the drive module 2, the speed limiting module 3 and the speed sensor 4 are all electrically connected to the control module 1. The control module 1 is used to control the drive module 2 and the speed limiting module 3, and to receive data from the drive module 2, the speed limiting module 3 and the speed sensor 4.

[0031] This utility model uses a control module 1 to control the operation of the elevator, and a drive module 2 to drive the elevator car up and down. Specifically, the drive motor drives the elevator car, and a motor speed monitoring module on the drive motor monitors the motor speed, which corresponds to the speed of the elevator car. The motor speed monitoring module is electrically connected to the control module 1. The control module 1 calculates the elevator car's speed based on the drive motor's speed, thereby determining whether the elevator car is overspeeding. A speed limiting module 3 is used to limit the elevator car's speed when it is overspeeding. Specifically, a speed limiter protects the elevator car's speed, and an elevator speed monitoring module on the speed limiter monitors the elevator car's speed. A friction wheel 10 works in conjunction with a speed sensor 4 to... The speed limiter wheel 9 of the speed limiter is monitored to monitor the speed of the elevator car and determine whether the elevator car is overspeeding. This utility model monitors the speed of the elevator car in real time through three methods: motor speed monitoring module, elevator speed monitoring module, and speed sensor 4. It can greatly provide redundancy in elevator car speed monitoring. As long as these three methods do not fail simultaneously, it will not affect the monitoring of the car speed. If one or two of these three car speed monitoring methods fail or are inaccurate, they can be detected and repaired in time by comparing the speeds monitored by the three. When the elevator car is found to be overspeeding, the control module 1 can control the drive module 2 and the speed limiter module 3 to react in time and reduce the car speed. For example, when overspeeding occurs, the drive motor of the drive module 2 can stop driving the elevator car, and the speed limiter can brake in an emergency.

[0032] Furthermore, the housing 8 of the speed limiter is provided with two mounting plates 11, and the speed limiting wheel 9 of the speed limiter is located between the two mounting plates 11. A rotating shaft 12 is rotatably mounted between the two mounting plates 11 via a bearing. The friction wheel 10 is mounted on the rotating shaft 12. The mounting plates 11 and the rotating shaft 12 are used to mount the friction wheel 10. The speed sensor 4 is mounted on the mounting plate 11 to monitor the rotational speed of the rotating shaft 12. The rotating shaft 12 is driven by the friction wheel 10, and the rotational speed of the rotating shaft 12 is the same as the rotational speed of the friction wheel 10. Therefore, the speed sensor 4 can monitor the rotational speed of the speed limiting wheel 9 of the speed limiter by monitoring the rotational speed of the rotating shaft 12, thereby further realizing the monitoring of the elevator car speed.

[0033] Furthermore, the length direction of the rotating shaft 12 is parallel to the axial direction of the speed limiter wheel 9, so that the speed limiter wheel 9 can drive the friction wheel 10 to rotate through friction.

[0034] Furthermore, the speed sensor 4 is a photoelectric tachometer, which is used to monitor the speed of the elevator car.

[0035] Furthermore, a Hall sensor 5 is installed on the housing of the speed limiter, and a magnet 13 corresponding to the position of the Hall sensor 5 is installed on the speed limiter wheel 9. The Hall sensor 5 is electrically connected to the control module 1. Every time the speed limiter wheel 9 rotates once, the magnet 13 passes through the sensing area of ​​the Hall sensor 5, thereby enabling the Hall sensor 5 to monitor the rotational speed of the speed limiter wheel 9. Since the rotational speed of the speed limiter wheel 9 corresponds to the speed of the elevator car, the Hall sensor 5 can monitor the speed of the elevator car, thereby further improving the redundancy of elevator car speed monitoring.

[0036] Furthermore, it also includes a control cabinet, in which the control module 1 is installed. The control cabinet is used to install electrical equipment such as the control module 1.

[0037] Furthermore, it also includes a display module 6 for displaying the elevator speed. The display module 6 is installed on the cabinet door of the control cabinet and is electrically connected to the control module 1. The display module 6 allows maintenance and debugging personnel to observe the elevator car speed detected by various means in real time. The display module 6 includes a display screen, which is electrically connected to the control module 1.

[0038] Furthermore, it also includes an alarm module 7, which is electrically connected to the control module 1. The alarm module 7 can trigger an alarm when the elevator car is overspeeding. In this embodiment, the alarm module 7 may include a buzzer and a tri-color warning light, which can be installed in a monitoring room where personnel are on duty.

[0039] In this embodiment, the control module 1 includes a programmable logic controller (PLC), which is electrically connected to the motor speed monitoring module, the elevator speed monitoring module, the photoelectric sensor, the Hall sensor 5, the display screen, the buzzer, and the three-color warning light.

[0040] It should be noted that although the present invention has been disclosed above with specific embodiments, the above embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A PLC-controlled elevator overspeed protection system, characterized in that, include: A drive module includes a drive motor, and the drive motor includes a motor speed monitoring module for monitoring the speed of the drive motor; A speed limiting module includes a speed limiter, wherein the speed limiter includes an elevator speed monitoring module for monitoring the speed of the elevator car; A friction wheel is mounted on the housing of the speed limiter, and the friction wheel abuts against the speed limiting wheel of the speed limiter so that the speed limiting wheel of the speed limiter drives the friction wheel to rotate. A speed sensor is provided on one side of the friction wheel to monitor the speed of the friction wheel. The control module, the drive module, the speed limiting module, and the speed sensor are all electrically connected to the control module.

2. The PLC-controlled elevator overspeed protection system as described in claim 1, characterized in that, The speed limiter has two mounting plates on its outer casing. The speed limiting wheel of the speed limiter is located between the two mounting plates. A rotating shaft is rotatably mounted between the two mounting plates via a bearing. The friction wheel is mounted on the rotating shaft.

3. The PLC-controlled elevator overspeed protection system as described in claim 2, characterized in that, The length direction of the rotating shaft is parallel to the axis direction of the speed limiter wheel.

4. The PLC-controlled elevator overspeed protection system as described in claim 2, characterized in that, The speed sensor is a photoelectric tachometer.

5. The PLC-controlled elevator overspeed protection system as described in claim 1, characterized in that, A Hall sensor is installed on the housing of the speed limiter, and a magnet corresponding to the position of the Hall sensor is installed on the speed limiting wheel of the speed limiter. The Hall sensor is electrically connected to the control module.

6. The PLC-controlled elevator overspeed protection system as described in claim 1, characterized in that, It also includes a control cabinet, in which the control module is installed.

7. The PLC-controlled elevator overspeed protection system as described in claim 6, characterized in that, It also includes a display module for displaying elevator speed. The display module is installed on the cabinet door of the control cabinet and is electrically connected to the control module.

8. The PLC-controlled elevator overspeed protection system as described in claim 1, characterized in that, It also includes an alarm module, which is electrically connected to the control module.

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