Overhead man-vehicle speed protection test device and test method

Abstract

The invention discloses an overhead man-car speed protection test device and test method, and belongs to the technical field of coal mine transportation, and the device comprises a fixed frame, a movable frame, a speed measurement test wheel and a speed sensor. The fixing frame is installed on the rope supporting wheel frame. One end of the movable frame is hinged with the fixed frame, and the other end is rotatably provided with the speed-measuring test wheel; the monitoring side surface of the speed measurement test wheel is provided with an induction magnet block. The speed sensor is installed on the movable frame through a sensor support, and the induction end of the speed sensor is aligned with the induction magnet block. During daily monitoring, the speed measurement test wheel contacts with the steel wire rope and rotates along with the steel wire rope. The device is provided with a lifting device for lifting the speed measurement test wheel away from the steel wire rope. According to the invention, the speed protection test can be carried out in a non-stop state, the loss caused by frequent start and stop of equipment is avoided, and the operation safety and the test efficiency are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of coal mine transportation technology, specifically relating to an overhead personnel vehicle speed protection test device and test method. Background Technology

[0002] The aerial personnel carrier (also known as a "monkey car") in coal mines is a key piece of equipment used to transport personnel up and down inclined shafts or horizontal tunnels. It is powered by a friction wheel on a reducer driven by an electric motor, and uses an overhead steel wire rope for endless cyclic traction. The passenger chair is connected to the steel wire rope via a cable gripper. It plays a positive role in improving work efficiency, reducing labor intensity, improving the working environment, and ensuring personnel safety. This device typically includes a drive unit, rope pulley, passenger carrier, tail pulley device, tensioning device, safety protection devices, and an electrical control system. Its safe operation is paramount. For personnel safety, not only is a comprehensive protection system necessary, but various protection systems must also be tested daily. Speed ​​protection is particularly important. Speed ​​protection (including underspeed protection and overspeed protection) is one of the core functions of the safety protection system, used to automatically shut down the machine when the operating speed is abnormal, preventing safety accidents.

[0003] Currently, the speed measurement protection methods commonly used in the industry are such as Figure 1 and Figure 2 As shown, several induction magnets (usually 10) are evenly attached to the circumference of the side of the "force-bearing" rope-supporting pulley. A speed sensor is installed near the pulley axle via a sensor bracket, and the magnetic induction surface of the speed sensor is adjusted to align with the circumference of the rope-supporting pulley. When a speed protection test is required, the pulse frequency detected by the sensor must be changed by increasing or decreasing the number of induction magnets attached to the side of the pulley, thereby simulating speed changes. This method has the following drawbacks:

[0004] Firstly, the operation is cumbersome and inefficient: Each test requires stopping the overhead personnel carrier, then having an operator approach the rotating parts to attach or remove magnets, and then restarting the machine after the test is completed. The entire process is tedious and time-consuming.

[0005] Secondly, equipment wear and tear and operational interruptions: Frequent start-up and shutdown operations impact power components such as drive motors and reducers, accelerating equipment aging. At the same time, they interrupt transportation services, affecting the efficiency of personnel passage underground and increasing waiting time for employees.

[0006] Thirdly, there are significant safety hazards: operators need to work repeatedly near the moving parts of the equipment, which poses a high safety risk. Summary of the Invention

[0007] The purpose of this invention is to provide a test device and method for speed protection of overhead personnel carriers, solving the problem of frequent start-stop of overhead personnel carriers in traditional technologies.

[0008] The technical solution adopted in this invention is: an overhead personnel carrier speed protection test device. The overhead personnel carrier includes a steel wire rope and a rope-supporting wheel for supporting the steel wire rope. The rope-supporting wheel is mounted on a rope-supporting wheel frame, which includes a fixed frame, a movable frame, a speed-measuring test wheel, and a speed sensor. The fixed frame is fixedly mounted on the rope-supporting wheel frame. One end of the movable frame is hinged to the fixed frame, and the other end is rotatably mounted with the speed-measuring test wheel. An inductive magnet is mounted on the monitoring side of the speed-measuring test wheel. The speed sensor is mounted on the movable frame through a sensor bracket, and its sensing end is aligned with the inductive magnet on the speed-measuring test wheel. In normal monitoring conditions, the speed-measuring test wheel contacts the steel wire rope from above, and the movement of the steel wire rope drives the speed-measuring test wheel to rotate. A lifting device is also provided to lift the speed-measuring test wheel away from the steel wire rope.

[0009] Furthermore, the lifting device includes an upward lifting handle, a release mechanism, and a release lever; the top end of the upward lifting handle is hinged to the lower surface of the movable frame; the release mechanism includes a fixed release hook and a movable release member; the fixed release hook is fixedly installed on the fixed frame; a rotating fulcrum fork-shaped seat is fixed on the movable frame; the middle part of the movable release member is hinged to the rotating fulcrum fork-shaped seat, one end of which is provided with an anti-disengagement hook adapted to the fixed release hook at a position corresponding to the fixed release hook, and the other end is hinged to the top end of the release lever; the release lever is movably inserted into the lever through hole of the movable frame, and a telescopic spring is fitted on the release lever, the telescopic spring being located between the movable release member and the movable frame.

[0010] Furthermore, a short crossbar is detachably connected to the bottom end of the trip lever.

[0011] Furthermore, the lifting handle is fitted with a rubber sleeve, and a handle mounting hole is drilled at the top. A handle fork-shaped seat is welded to the lower surface of the movable frame. The lifting handle is installed on the handle fork-shaped seat by passing the handle pin through the handle mounting hole at the top of the lifting handle.

[0012] Furthermore, an open fork is welded to the top of the release rod, and the release rod is hinged to the tail of the movable release component via the open fork.

[0013] Furthermore, the rope-supporting wheel frame is fixed to the I-beam crossbeam by a U-shaped clamp.

[0014] The test method using the overhead pedestrian and vehicle speed protection test device includes daily monitoring steps and test steps;

[0015] The daily monitoring steps are as follows: keep the speed measuring test wheel in contact with the running steel wire rope, and let the steel wire rope drive the speed measuring test wheel to rotate synchronously. The speed sensor continuously detects the rotation speed signal and transmits it to the electronic control system to realize the monitoring of the normal operating speed.

[0016] The test steps include:

[0017] Test preparation steps: Operate the lifting device to lift the speed measuring test wheel away from the wire rope and lock the movable frame in the lifting position;

[0018] Underspeed protection test procedure: After the speed measuring test wheel is detached from the wire rope, it is allowed to rotate freely and the speed will decrease naturally; the speed sensor is used to monitor its speed and verify whether the electronic control system triggers underspeed protection and executes a shutdown action when the speed drops below the set underspeed protection value.

[0019] Overspeed protection test procedure: After the speed measuring test wheel is detached from the wire rope, manually drive the speed measuring test wheel to accelerate its rotation; monitor its rotation speed through the speed sensor, and verify whether the electronic control system triggers overspeed protection and executes a shutdown action when the rotation speed rises to exceed the set overspeed protection value;

[0020] Reset procedure: After the speed protection test is completed, the locking of the movable frame is released, allowing the speed measuring test wheel to fall back under the action of gravity and re-contact the wire rope, and the device returns to the daily monitoring state.

[0021] Furthermore, in the test preparation steps, the speed measuring test wheel is lifted away from the wire rope by operating the lifting handle, and the movable frame is automatically locked in the lifting position by the release mechanism consisting of a fixed release hook and a movable release component.

[0022] Furthermore, in the reset step, the anti-disengagement hook of the movable release component is disengaged from the fixed release hook by pulling down the release lever, thereby releasing the lock on the movable frame.

[0023] Furthermore, the underspeed protection test procedure and the overspeed protection test procedure can be performed in any order or separately. The underspeed protection test procedure can be performed first, followed by the overspeed protection test procedure; or the overspeed protection test procedure can be performed first, followed by the underspeed protection test procedure; or only the underspeed protection test procedure or only the overspeed protection test procedure can be performed.

[0024] The beneficial effects of this invention are as follows: The overhead personnel carrier speed protection test device disclosed in this invention, by additionally setting a speed measuring test wheel and by setting a lifting device, allows the speed measuring test wheel to be detached from the steel wire rope during the test. Without interrupting the normal operation of the overhead personnel carrier, the underspeed and overspeed conditions are simulated by the natural deceleration or artificial acceleration of the test wheel. This enables the test to be carried out without frequent machine stops, completely avoiding frequent start-stop of the equipment and reducing equipment damage.

[0025] The operator performs all operations via the lifting handle and release lever located in a safe area, keeping their body far away from the moving wire rope and sheave pulley, greatly reducing the risk of personal injury. The raised platform is locked by a mechanical release mechanism to prevent accidental descent, ensuring high safety.

[0026] One person can complete all the test items in a short time, which significantly saves manpower and time costs, reduces interference with underground transportation order, and helps ensure safe production and improve economic efficiency in coal mines.

[0027] The lifting device makes full use of the lever and spring latch principle, has a simple structure, low manufacturing cost, is easy to install and promote on existing equipment, and is reliable in operation and easy to maintain. Attached Figure Description

[0028] Figure 1 Schematic diagram of a traditional overhead vehicle speed protection test device;

[0029] Figure 2 for Figure 1 The left view;

[0030] Figure 3 This is a front view of the overhead vehicle speed protection test device disclosed in this invention under test conditions;

[0031] Figure 4 This is a front view of the overhead vehicle speed protection test device disclosed in this invention under routine monitoring conditions;

[0032] Figure 5 for Figure 4 The left view;

[0033] Figure 6 for Figure 4 Top view.

[0034] In the diagram, the components are: 1. Speed ​​sensor; 2. Induction magnet block; 3. Speed ​​test wheel; 4. Movable frame; 5. Pull rod through hole; 6. Telescopic spring; 7. Pull rod pin; 8. Open fork bracket; 9. Release pin; 10. Rotating fulcrum fork seat; 11. Movable release component; 12. Fixed release hook; 13. Fixed frame; 14. I-beam crossbeam; 15. U-shaped clamp; 16. Fixed plate; 17. Fastening nut; 18. Rope pulley frame; 19. Rope pulley; 20. Steel wire rope; 21. Fixed frame pin hole seat; 22. Release pull rod; 23. Lifting handle; 24. Handle pin; 25. Handle fork seat; 26. Test wheel pin; 27. Sensor bracket; 28. Rope pulley pin; 29. ​​Movable frame pin hole seat; 30. Short crossbar; 31. Anti-disengagement hook. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0036] In this specification, unless otherwise stated, the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the appendix. Figure 4 The orientation or positional relationship shown is for the purpose of describing the invention only, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0037] The overhead personnel carrier includes a steel wire rope 20 and a support pulley 19 for supporting the steel wire rope 20. The support pulley 19 is mounted via a support pulley frame 18. Normally, the support pulley 19 is mounted to the bottom of the support pulley frame 18 via a coaxial support pulley pin 28, and the support pulley 19 can rotate around the support pulley pin 28. A fixing plate 16 is welded to the top of the support pulley frame 18. The fixing plate 16 has through holes. A U-shaped clamp 15 is used to wrap around an I-beam crossbeam 14 and pass through the through holes in the fixing plate 16, and then a fastening nut 17 is tightened to fix the support pulley frame 18 to the I-beam crossbeam 14, thus achieving the installation of the support pulley 19. There is a certain distance between the inner surfaces of the support pulley frame 18 and the support pulley 19. The inner surface of the support pulley 19 refers to the side facing the support pulley frame 18.

[0038] Traditional overhead vehicle speed protection test devices, such as Figure 1 and Figure 2 As shown, it includes a speed sensor 1 and a sensing magnet block 2. The speed sensor 1 is fixed to the rope-supporting wheel frame 18 by a sensor bracket 27, and the sensing magnet block 2 is installed on the inner side of the rope-supporting wheel 19 by means of pasting or magnetic attraction. The sensing end of the speed sensor 1 is aligned with the sensing magnet block 2, and the speed is detected by collecting the pulse signal generated when the sensing magnet block 2 passes by.

[0039] The overhead vehicle speed protection test device disclosed in this invention, such as Figures 3-6 As shown, the principle of speed sensor 1 collecting data from inductive magnet blocks 2 is the same as that of traditional overhead vehicle speed protection test devices. That is, multiple inductive magnet blocks 2, evenly attached to the circumference of the rotating component, periodically pass over the fixed speed sensor 1 as the component rotates. The speed sensor 1 converts this data into a series of electrical pulse signals with a frequency proportional to the rotational speed. The electronic control system detects this pulse frequency to calculate the running speed of the wire rope 20 and compares it with the set overspeed or underspeed protection thresholds, thereby triggering a shutdown protection mechanism when the speed is abnormal.

[0040] Compared with the traditional overhead vehicle speed protection test device, the improvement of this invention is as follows: the overhead vehicle speed protection test device also includes a fixed frame 13, a movable frame 4, a speed measuring test wheel 3, and a speed sensor 1; the fixed frame 13 is fixedly installed on the rope support wheel frame 18; one end of the movable frame 4 is hinged to the fixed frame 13, and the other end is rotatably mounted on the speed measuring test wheel 3; an inductive magnet block 2 is installed on the monitoring side of the speed measuring test wheel 3; the speed sensor 1 is installed on the movable frame 4 through a sensor bracket 27, and its sensing end is aligned with the inductive magnet block 2 on the speed measuring test wheel 3; in the normal monitoring state, the speed measuring test wheel 3 contacts the steel wire rope 20 from above, and the movement of the steel wire rope 20 drives the speed measuring test wheel 3 to rotate; and a lifting device is provided to lift the speed measuring test wheel 3 away from the steel wire rope 20.

[0041] The lifting device can be a hydraulic cylinder, etc. In this embodiment, the lifting device includes an upward handle 23, a release mechanism, and a release lever 22. The top end of the upward handle 23 is hinged to the lower surface of the movable frame 4. The release mechanism includes a fixed release hook 12 and a movable release member 11. The fixed release hook 12 is fixedly installed on the fixed frame 13. A rotating fulcrum fork-shaped seat 10 is fixed on the movable frame 4. The middle part of the movable release member 11 is hinged to the rotating fulcrum fork-shaped seat 10. Its head is provided with an anti-disengagement hook 31 that is adapted to the fixed release hook 12 at the corresponding position, and its tail is hinged to the top end of the release lever 22.

[0042] A pull rod through hole 5 is drilled at the corresponding position of the movable frame 4. The release pull rod 22 is movably inserted into the pull rod through hole 5 of the movable frame 4. A telescopic spring 6 is fitted on the release pull rod 22. The telescopic spring 6 is located between the movable release part 11 and the movable frame 4.

[0043] To facilitate manual pulling of the release lever 22, a short crossbar 30 is detachably connected to the bottom end of the release lever 22.

[0044] The lifting handle 23 is fitted with a rubber sleeve for easy gripping, and a handle mounting hole is drilled at the top for installation. A handle fork-shaped seat 25 is welded to the corresponding position on the lower surface of the movable frame 4. The lifting handle 23 is installed on the handle fork-shaped seat 25 by passing the handle pin 24 through the handle mounting hole at the top of the lifting handle 23.

[0045] The top end of the release lever 22 is welded with an open fork 8, and the release lever 22 is hinged to the tail of the movable release member 11 via the open fork 8.

[0046] The fabrication and installation process of the overhead vehicle speed protection test device is as follows:

[0047] First, a fixing frame 13 is welded to the left side of the existing rope-supporting wheel frame 18 of the overhead personnel carrier. To ensure overall stability, a U-shaped clamp 15 is used to fasten the upper part of the rope-supporting wheel frame 18 to the I-beam crossbeam 14 underground. A fixing release hook 12 is welded at a suitable position on the fixing frame 13. A fixing frame pin hole seat 21 is machined at the tail end of the fixing frame 13.

[0048] Next, a long, rectangular movable frame 4 is fabricated. A movable frame pin hole seat 29 is welded to the right end of the movable frame 4. A first pin (not labeled in the figure) is inserted into the pin hole of the movable frame pin hole seat 29 and the pin hole of the fixed frame pin hole seat 21 of the fixed frame 13, and then a nut is tightened to achieve a rotatable connection between the movable frame 4 and the fixed frame 13, allowing the movable frame 4 to rotate upwards around the first pin. At the left end of the movable frame 4, a speed measuring test wheel 3 is installed via a test wheel pin 26 and a nut. This speed measuring test wheel 3 can rotate freely. Multiple induction magnet blocks 2 are evenly embedded or bonded to the circumferential side of the speed measuring test wheel 3. Simultaneously, a sensor bracket 27 is installed on the movable frame 4, and the speed sensor 1 is securely mounted on the sensor bracket 27 according to the specified sensing gap (usually no more than 6 mm) and orientation, ensuring that its sensing end is directly facing the induction magnet block 2 on the speed measuring test wheel 3.

[0049] Then, weld the handle fork-shaped seat 25 to the middle or left side of the lower surface of the movable frame 4. Rotate the top of the lifting handle 23 onto the handle fork-shaped seat 25 via the handle pin 24 to form a force-saving lever.

[0050] Finally, assemble the release mechanism. Weld a rotating fulcrum fork-shaped seat 10 to the right side of the movable frame 4. Hinge the middle part of the movable release element 11 to the rotating fulcrum fork-shaped seat 10 via the release pin 9, allowing it to rotate around the fulcrum. The upper end of the release lever 22 is connected to the end of the movable release element 11 near the lifting handle 23 via the open fork bracket 8 and the lever pin 7. Pass the lever body of the release lever 22 through the telescopic spring 6 and the pre-drilled lever hole 5 on the movable frame 4 from top to bottom. The telescopic spring 6 is pre-compressed between the movable release element 11 and the upper surface of the movable frame 4. For ease of operation, a short crossbar 30 can be added to the lower end of the release lever 22.

[0051] The working process of the overhead vehicle speed protection test device is as follows:

[0052] During routine testing and operation, such as Figure 4 , Figure 5 and Figure 6As shown, the speed measuring test wheel 3 is steadily pressed on the steel wire rope 20 from above, and rotates synchronously with the movement of the steel wire rope 20 by relying on friction. The induction magnet block 2 is sensed by the speed sensor 1. The speed sensor 1 continuously detects the rotation speed of the speed measuring test wheel 3 and transmits the signal to the electronic control system to realize normal operating speed monitoring and protection.

[0053] When a speed protection test is required, such as Figure 3 As shown, the operator holds the lower end of the lifting handle 23 and lifts it upwards. The lifting handle 23 rotates around the handle pin 24, and its top pushes the movable frame 4, causing the entire movable frame 4 to rotate clockwise around the first pin shaft, thereby driving the speed measuring test wheel 3 to lift and disengage from the wire rope 20. During the lifting process, the movable release element 11 rotates around the release pin shaft 9. When its front anti-disengagement hook 31 passes the fixed release hook 12, under the restoring force of the telescopic spring 6, the head of the movable release element 11 quickly swings downwards, so that its anti-disengagement hook 31 is reliably engaged with the fixed release hook 12, thereby locking the movable frame 4 in the lifted position. At this time, the speed measuring test wheel 3 loses the drive of the wire rope 20 and rotates only by inertia, and the speed gradually decreases. When the speed detected by the speed sensor 1 is lower than the underspeed protection value set by the system, the electronic control system should trigger the underspeed protection action to stop the overhead personnel carrier, thereby verifying the effectiveness of the underspeed protection function.

[0054] During the overspeed protection test, the operator manually and quickly rotates the suspended speed measuring test wheel 3 to exceed the set overspeed protection value to verify whether the overspeed protection function is functioning correctly. If the overspeed protection activates and the overhead personnel carrier still stops, it proves that the overspeed protection function is normal; if it fails to stop, it proves that the overspeed protection function is malfunctioning.

[0055] After the test operation is completed, the operator pulls down the trip lever 22. The trip lever 22 drives the tail of the movable trip element 11 via the lever pin 7. Figure 3 or Figure 4 The left end of the movable release element 11 rotates downward around its fulcrum, causing its head ( Figure 3 or Figure 4 The anti-disengagement hook 31 at the right end of the movable release element 11 overcomes the spring force and tilts upward, thus disengaging from the fixed release hook 12. Once disengaged, the movable frame 4 automatically resets under gravity, and the speed measuring test wheel 3 smoothly falls back onto the wire rope 20, restoring the device to its normal monitoring state.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A speed protection test device for an overhead personnel carrier, the overhead personnel carrier comprising a steel wire rope (20) and a rope-supporting wheel (19) for supporting the steel wire rope (20), the rope-supporting wheel (19) being mounted via a rope-supporting wheel frame (18), characterized in that, It includes a fixed frame (13), a movable frame (4), a speed measuring test wheel (3), and a speed sensor (1); the fixed frame (13) is fixedly installed on the rope-supporting wheel frame (18); one end of the movable frame (4) is hinged to the fixed frame (13), and the speed measuring test wheel (3) is rotatably installed at the other end; A sensing magnet block (2) is installed on the monitoring side of the speed measuring test wheel (3); The speed sensor (1) is mounted on the movable frame (4) via a sensor bracket (27), with its sensing end aligned with the sensing magnet block (2) on the speed measuring test wheel (3); Under normal monitoring conditions, the speed test wheel (3) contacts the wire rope (20) from above, and the speed test wheel (3) rotates due to the movement of the wire rope (20); It is also equipped with a lifting device to lift the speed test wheel (3) away from the wire rope (20).

2. The overhead vehicle speed protection test device according to claim 1, characterized in that: The lifting device includes an upward lifting handle (23), a release mechanism, and a release lever (22); The top of the lifting handle (23) is hinged to the lower surface of the movable frame (4); The tripping mechanism includes a fixed tripping hook (12) and a movable tripping component (11); the fixed tripping hook (12) is fixedly installed on the fixed frame (13); a rotating fulcrum fork-shaped seat (10) is fixed on the movable frame (4); the middle part of the movable tripping component (11) is hinged to the rotating fulcrum fork-shaped seat (10), one end of which is provided with an anti-tripping hook (31) adapted to the fixed tripping hook (12) at the corresponding position, and the other end is hinged to the top of the tripping pull rod (22). The tripping pull rod (22) is movably inserted into the pull rod through hole (5) of the movable frame (4), and a telescopic spring (6) is fitted on the tripping pull rod (22). The telescopic spring (6) is located between the movable tripping component (11) and the movable frame (4).

3. The overhead vehicle speed protection test device according to claim 2, characterized in that: A short crossbar (30) is detachably connected to the bottom end of the trip lever (22).

4. The overhead vehicle speed protection test device according to claim 2, characterized in that: The lifting handle (23) is fitted with a rubber sleeve and has a handle mounting hole drilled at the top. A handle fork-shaped seat (25) is welded to the lower surface of the movable frame (4). The lifting handle (23) is installed on the handle fork-shaped seat (25) by passing the handle pin (24) through the handle mounting hole at the top of the lifting handle (23).

5. The overhead vehicle speed protection test device according to claim 2, characterized in that: The top end of the release lever (22) is welded with an open fork bracket (8), and the release lever (22) is hinged to the tail of the movable release member (11) via the open fork bracket (8).

6. The overhead vehicle speed protection test device according to claim 2, characterized in that: The rope-supporting wheel frame (18) is fixed to the I-beam crossbeam (14) by a U-shaped clamp (15).

7. A test method using the overhead pedestrian and vehicle speed protection test device according to any one of claims 1-6, characterized in that, This includes routine monitoring procedures and testing procedures; The daily monitoring steps are as follows: keep the speed test wheel (3) in contact with the running wire rope (20), and drive the speed test wheel (3) to rotate synchronously by the wire rope (20). The speed sensor (1) continuously detects the rotation speed signal and transmits it to the electronic control system to realize the monitoring of normal operating speed. The test steps include: Test preparation steps: Operate the lifting device to lift the speed test wheel (3) away from the wire rope (20) and lock the movable frame (4) in the lifting position; Underspeed protection test steps: After the speed test wheel (3) is disconnected from the wire rope (20), it is allowed to rotate freely and the speed naturally decreases; the speed is monitored by the speed sensor (1) to verify whether the electrical control system triggers underspeed protection and performs a shutdown action when the speed drops below the set underspeed protection value. Overspeed protection test steps: After the speed test wheel (3) is detached from the wire rope (20), manually drive the speed test wheel (3) to accelerate its rotation; monitor its rotation speed through the speed sensor (1) and verify whether the electronic control system triggers overspeed protection and performs a shutdown action when the rotation speed rises to exceed the set overspeed protection value; Reset procedure: After the speed protection test is completed, the locking of the movable frame (4) is released, and the speed measuring test wheel (3) falls back under the action of gravity and re-contacts the wire rope (20), and the device returns to the daily monitoring state.

8. The test method according to claim 7, characterized in that, In the test preparation step, the speed test wheel (3) is lifted away from the wire rope (20) by operating the lifting handle (23), and the movable frame (4) is automatically locked in the lifting position by the release mechanism consisting of the fixed release hook (12) and the movable release part (11).

9. The test method according to claim 8, characterized in that, During the reset step, the anti-disengagement hook (31) of the movable release element (11) is disengaged from the fixed release hook (12) by pulling down the release lever (22), thereby releasing the lock on the movable frame (4).

10. The test method according to claim 7, characterized in that, The underspeed protection test procedure and the overspeed protection test procedure may be performed in any order or individually.

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