No-load elevator safety performance evaluation device based on wavelet analysis

Abstract

The invention relates to a no-load method elevator safety performance evaluation device based on wavelet analysis, and belongs to the technical field of elevator safety performance detection, the no-load method elevator safety performance evaluation device comprises a guide rail used for guiding an elevator car body and evaluation equipment used for evaluating the elevator car body, and the evaluation equipment is composed of a buffer structure, a transmission structure, a spray pipe and a test structure; the buffering structure comprises a support, a mounting plate is welded to the outer wall of the support, and a buffering piece is fixed to the upper surface of the support. And the transmission structure comprises a rotary drum rotationally mounted in the bracket. According to the no-load elevator safety performance evaluation device based on wavelet analysis, through comparison of lubrication and non-lubrication tests, the key effect of lubrication on the dynamic performance and durability of an elevator is verified, and a comprehensive evaluation system based on multi-physical field coupling such as vibration, friction and fluid is also established; and a full-chain solution from a microcosmic wear mechanism to macroscopic system response is provided for elevator safety performance evaluation.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator safety performance detection, and in particular to an elevator safety performance evaluation device using a no-load method based on wavelet analysis. Background Art

[0002] Elevator safety devices include safety clamps and buffers. Traditionally, braking force testing of elevator safety clamps is performed in accordance with the national standard GB7588, using a weight that is 125% of the full scale to perform a qualitative measurement. This method is time-consuming and labor-intensive, and also causes significant wear and tear on the safety clamp's safety materials.

[0003] A search revealed patent document CN115028038A, which discloses a wavelet-based, no-load elevator safety performance assessment device. This device, which relates to the technical field of elevator safety performance testing, includes an elevator shaft and an acceleration sensor assembly. The shaft houses an elevator body, with a threaded hole defined at the top. Sealing rings are located at both the bottom and top of the expanded hole. The acceleration sensor assembly is threadedly connected to the threaded hole, and a safety clamp is located on the outer wall of the elevator body. This wavelet-based, no-load elevator safety performance assessment device uses a sensor body, a vibration sensor, and a pressure sensor to simultaneously acquire parameters of the elevator body during descent. The device also uses two-dimensional wavelet analysis to simultaneously analyze the elevator tension and car vibration signals. Using a two-dimensional wavelet transform, the device identifies the spectral characteristics between the wire rope tension and the car x-axis vibration signals under the action of the new and old safety clamps, thereby determining the degree of wear and buffering performance of the safety clamp.

[0004] However, the above patents still have the following deficiencies: for example, the existing scheme only tests the performance of the buffer and the safety clamp through no-load free fall, and does not cover various working conditions in the actual operation of the elevator, such as overload or uneven guide rails, and the evaluation results may be one-sided.

[0005] In view of this, an elevator safety performance evaluation device using an empty load method based on wavelet analysis is proposed to solve the above problems. Summary of the Invention

[0006] In response to the shortcomings of the existing technology, the present invention provides an elevator safety performance evaluation device using the no-load method based on wavelet analysis, which has the advantages of multi-dimensional evaluation, dynamic testing and visual feedback, and comparison of lubricated and non-lubricated tests. It solves the problem that some solutions only test the performance of buffers and safety clamps through no-load free fall, but do not cover various working conditions in the actual operation of elevators, such as overload or uneven guide rails, and the evaluation results may be one-sided.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: a wavelet analysis-based no-load elevator safety performance evaluation device, comprising a guide rail for guiding an elevator car body and an evaluation device for evaluating the elevator car body, wherein the evaluation device comprises a buffer structure, a transmission structure, a nozzle, and a test structure;

[0008] The buffer structure includes a bracket, a mounting plate is welded on the outer wall of the bracket, and a buffer member is fixed on the upper surface of the bracket;

[0009] The transmission structure includes a rotating drum rotatably mounted inside the bracket, an abutment shaft connected to the buffer member is provided on the outside of the rotating drum, and a reciprocating slide groove adapted to the abutment shaft is provided inside the rotating drum;

[0010] The test structure consists of a liquid storage tank, a reciprocating seat, a display component and an infusion component. A stirring shaft is rotatably installed inside the liquid storage tank. A synchronizing component is provided between the stirring shaft and the rotating drum. A connecting arm is provided between the buffer component and the reciprocating seat.

[0011] Furthermore, a guide groove is provided on the inner side of the guide rail, a guide block slidingly engaged with the guide groove is fixed on the outer wall of the elevator box, a swaying device is provided on the top side of the elevator box, an acceleration sensor is fixed on the outer wall of the top side of the elevator box, and the nozzle is fixed on the outer surface of the bottom side of the guide rail.

[0012] Furthermore, the buffer component includes a hydraulic buffer telescopic rod arranged on the upper surface of the bracket, a contact plate is fixed on the top side of the hydraulic buffer telescopic rod, a guide rod is fixed between the mounting plate and the bracket, and a slide is installed on the outer surface of the guide rod, and a buffer spring is fixed between the slide and the bracket.

[0013] Furthermore, a connecting rod is fixed between the abutment plate and the slide, the buffer spring is wrapped around the outside of the guide rod, the abutment shaft is detachably installed inside the slide, and the end of the abutment shaft is rotatably installed with a ball that rolls in a reciprocating slide.

[0014] Furthermore, the number of the guide rods, buffer springs and connecting rods is two, the two guide rods and the two connecting rods are symmetrically arranged, and an arc-shaped groove is opened inside the sliding seat.

[0015] Furthermore, the interior of the rotating drum is hollow and its two ends are connected up and down. The bottom end of the rotating drum passes through the interior of the bracket. The hydraulic buffer telescopic rod is located inside the rotating drum, and the outer surface of the top end of the telescopic sleeve of the hydraulic buffer telescopic rod is fixed with a positioning frame fixed to the outer wall of the mounting plate.

[0016] Furthermore, the display component includes a support frame fixed to the upper surface of the bracket, the internal bearing of the support frame is equipped with a rotating shaft, the outer surface of the rotating shaft is respectively fixed with a gear and a turntable, a scale plate is provided on the side of the gear away from the rotating shaft, and the connecting arm is hinged between the reciprocating seat and the sliding seat.

[0017] Furthermore, the display component also includes a docking shaft arranged on the dial, one end of the docking shaft is fixed to the rotating shaft, and a pointer is fixed to the outer surface of the docking shaft, a rack engaged with the gear is fixed on the outer wall of the reciprocating seat, and a guide bar guiding the reciprocating seat is also fixed on the upper surface of the bracket.

[0018] Furthermore, the infusion component includes a piston cylinder fixed to the upper surface of the bracket, two check valves in number and symmetrically arranged are fixed on the outer wall of the piston cylinder, a piston block is slidably abutted inside the piston cylinder, a connecting shaft is fixed on the outer wall of the piston block, and an annular frame is fixed to the other end of the connecting shaft, and a roller that rolls with the annular frame is provided on the outer surface of the turntable, and a connecting pipe is fixed to one end of the two check valves, and the two connecting pipes are fixedly connected to the nozzle and the liquid storage tank respectively.

[0019] Furthermore, the synchronizer includes two synchronized wheels fixed to the outer surface of the drum and the outer surface of the stirring shaft, and a synchronized belt is connected between the two synchronized wheels.

[0020] Compared with the prior art, the present invention provides an elevator safety performance evaluation device using the no-load method based on wavelet analysis, which has the following beneficial effects:

[0021] 1. This no-load elevator safety performance assessment device based on wavelet analysis collects vibration signals through acceleration sensors and combines them with physical wear detection of the clearance between guide rails and guide blocks to achieve a dual assessment of the elevator's dynamic performance and static wear, avoiding the limitations of single-parameter evaluation. Since the lubrication status directly affects vibration characteristics such as friction noise or impact spectrum, unlubricated testing can expose extreme wear risks. The combination of the two can accurately quantify the improvement effect of lubrication on the system's damping characteristics, thereby improving test accuracy.

[0022] 2. This no-load elevator safety performance assessment device based on wavelet analysis connects the first-level rigid buffer of the hydraulic buffer telescopic rod in series with the second-level flexible buffer of the buffer spring and slide system, and cooperates with the guide rod to ensure the stability of the motion trajectory, significantly reducing the direct transmission of impact energy to the elevator body. The buffer spring compression energy storage and release process realizes the recycling of impact energy, extending the service life of the buffer. At the same time, the lubricant can reduce the friction loss between the buffer and the slide. The unlubricated test can verify the durability boundary of the buffer system under dry friction conditions.

[0023] 3. This no-load elevator safety performance evaluation device based on wavelet analysis converts the linear motion of the buffer into rotational power through a rotating drum and a reciprocating slide, drives the stirring shaft to activate the lubricant, tests the guide rail wear rate and the energy absorption efficiency of the buffer under lubrication conditions, and evaluates the degree to which lubrication improves the system's damping characteristics. At the same time, it drives the gears and dials of the display unit, converting pressure changes into pointer deflections in real time, realizing visual monitoring of test data.

[0024] 4. This no-load elevator safety performance assessment device based on wavelet analysis uses a piston cylinder to form a lubricant circulation system with a check valve and a nozzle. Connecting pipes connect the liquid storage tank and the nozzle respectively, ensuring that the lubricant is accurately sprayed onto the mating surface of the guide block and the guide groove, simulating the lubrication conditions of actual working conditions. At the same time, it can perform extreme working condition verification of unlubricated tests, test the maximum load capacity of the buffer structure and the critical value of guide rail wear under unlubricated conditions, determine the safety threshold of the elevator in the event of sudden lubrication failure, and compare lubricated and unlubricated test data to verify whether parameters such as the buffer spring stiffness and hydraulic rod stroke meet the safety redundancy requirements under extreme working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural stereogram of an elevator safety performance evaluation device using an unloaded method based on wavelet analysis according to the present invention;

[0026] Figure 2 This is a schematic structural diagram of a guide rail in a no-load elevator safety performance evaluation device based on wavelet analysis according to the present invention;

[0027] Figure 3 This is a schematic diagram of the overall structure of an evaluation device in an elevator safety performance evaluation device using an unloaded method based on wavelet analysis according to the present invention;

[0028] Figure 4 This is a device for evaluating elevator safety performance using an empty load method based on wavelet analysis. Figure 3 A schematic diagram of the enlarged structure shown;

[0029] Figure 5 This is a schematic structural diagram of a test structure in a no-load elevator safety performance evaluation device based on wavelet analysis according to the present invention;

[0030] Figure 6 This is a schematic structural diagram of a display component in a no-load elevator safety performance evaluation device based on wavelet analysis according to the present invention;

[0031] Figure 7 This is a schematic diagram of the back structure of a dial in an elevator safety performance evaluation device using a no-load method based on wavelet analysis according to the present invention.

[0032] Figure: 1. Elevator body; 11. Guide block; 2. Guide rail; 21. Guide groove; 3. Swaying device; 4. Evaluation device; 5. Buffer structure; 501. Bracket; 502. Mounting plate; 503. Hydraulic buffer telescopic rod; 504. Abutment plate; 505. Guide rod; 506. Slide; 507. Buffer spring; 508. Connecting rod; 6. Transmission structure; 601. Rotating drum; 602. Reciprocating slide; 603. Abutment shaft; 7. Nozzle; 8. Test structure; 801. Liquid storage tank; 8011. Agitator shaft; 802. 02. Reciprocating seat; 803. Connecting arm; 804. Display component; 8041. Support frame; 8042. Rotating shaft; 8043. Gear; 8044. Rack; 8045. Dial; 80451. Docking shaft; 80452. Pointer; 8046. Roller; 8047. Ring frame; 8048. Connecting shaft; 8049. Turntable; 805. Infusion component; 8051. Piston cylinder; 8052. Check valve; 8053. Piston block; 806. Connecting pipe; 807. Synchronous wheel; 808. Synchronous belt. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] See also Figures 1 to 7 In this embodiment, an elevator safety performance evaluation device using an unloaded method based on wavelet analysis includes a guide rail 2 for guiding an elevator car body 1 and an evaluation device 4 for evaluating the elevator car body 1. A guide groove 21 is provided on the inner side of the guide rail 2, and a guide block 11 is fixed on the outer wall of the elevator car body 1 to slide with the guide groove 21. A swaying device 3 is provided on the top side of the elevator car body 1, and an acceleration sensor is fixed on the top outer wall of the elevator car body 1. The acceleration sensor is fixed to the top outer wall of the elevator car body 1 and can collect vibration signals during the operation of the elevator in real time. These signals provide raw data for wavelet analysis, making the evaluation of performance issues such as wear of the elevator guide rail 2 and attenuation of the evaluation device 4 more accurate. The guide groove 21 on the inner side of the guide rail 2 slides with the guide block 11 on the outer wall of the elevator car body 1. This design ensures that the elevator car body 1 can move stably along the predetermined trajectory during operation, effectively reducing deviation and shaking, thereby improving the overall operational stability of the elevator.

[0035] Furthermore, the clearance and wear between the guide groove 21 and the guide block 11 directly reflect the degree of wear on the guide rail 2. Regularly monitoring this clearance allows for timely detection of wear issues on the guide rail 2, providing an important basis for elevator maintenance and replacement, effectively extending the elevator's service life. Furthermore, the swaying device 3 can repeatedly simulate the same vibration conditions, facilitating multiple tests of the elevator and comparing performance differences under different maintenance conditions. This repeatable testing provides strong support for long-term monitoring and evaluation of elevator performance.

[0036] In this embodiment, the evaluation device 4 is composed of a buffer structure 5, a transmission structure 6, a nozzle 7 and a test structure 8; the nozzle 7 is fixed to the outer surface of the bottom side of the guide rail 2. It should be noted that when the elevator car body 1 moves downward, a buffer test is performed through the evaluation device 4. When the elevator car body 1 stops moving downward, the position of the guide block 11 is adapted to the nozzle 7, and the spray hole on the nozzle 7 faces the guide block 11. The buffer structure 5 includes a bracket 501, a mounting plate 502 is welded to the outer wall of the bracket 501, and a buffer part is fixed to the upper surface of the bracket 501; specifically, the buffer part includes a hydraulic buffer telescopic rod 503 provided on the upper surface of the bracket 501, and the hydraulic buffer telescopic rod 503 directly contacts the elevator car body 1 through the abutment plate 504, which can effectively absorb the impact energy generated when the elevator moves downward. An abutment plate 504 is fixed to the top side of the hydraulic buffer telescopic rod 503, and a guide rod 505 is fixed between the mounting plate 502 and the bracket 501. The guide rod 505 provides a stable motion trajectory for the slide 506, ensuring that the slide 506 can move in a predetermined direction when impacted. This avoids the offset and shaking of the slide 506, and improves the stability and reliability of the buffer structure 5. The slide 506 is sleeved and mounted on the outer surface of the guide rod 505, and a buffer spring 507 is fixed between the slide 506 and the bracket 501. When the slide 506 is impacted, the buffer spring 507 is compressed and absorbs the impact energy. When the impact energy decreases, the buffer spring 507 releases the stored energy, pushing the slide 506 back to its initial position. This design achieves the effective storage and release of impact energy, improving the efficiency and durability of the buffer structure 5.

[0037] A connecting rod 508 is fixed between the abutment plate 504 and the slide 506. A buffer spring 507 surrounds the outside of the guide rod 505. The abutment shaft 603 is removably mounted inside the slide 506, and a ball bearing is rotatably mounted on the end of the abutment shaft 603, which rolls in tandem with the reciprocating groove 602. There are two guide rods 505, two buffer springs 507, and two connecting rods 508, each symmetrically arranged. An arcuate groove is defined within the slide 506.

[0038] In this embodiment, the transmission structure 6 includes a rotating drum 601 rotatably mounted within the bracket 501. An abutting shaft 603 connected to the buffer member is disposed on the exterior of the rotating drum 601. A reciprocating slideway 602 adapted to the abutting shaft 603 is provided within the rotating drum 601. Specifically, the interior of the rotating drum 601 is hollow, with both ends extending vertically through it. The bottom end of the rotating drum 601 extends through the interior of the bracket 501. The hydraulic buffer telescopic rod 503 is located within the rotating drum 601. A positioning bracket is fixed to the outer surface of the telescopic sleeve of the hydraulic buffer telescopic rod 503, which is fixed to the outer wall of the mounting plate 502. The bottom end of the hydraulic buffer telescopic rod 503 can extend through the interior of the rotating drum 601 and be fixed to the inner side of the bracket 501 via a stopper, thereby strengthening support for the hydraulic buffer telescopic rod 503.

[0039] The test structure 8 consists of a liquid storage tank 801, a reciprocating seat 802, a display part 804 and an infusion part 805. A stirring shaft 8011 is rotatably installed inside the liquid storage tank 801. A synchronization part is provided between the stirring shaft 8011 and the rotating cylinder 601, and a connecting arm 803 is provided between the buffer part and the reciprocating seat 802.

[0040] Display member 804 includes a support frame 8041 fixed to the upper surface of bracket 501. A rotating shaft 8042 is mounted on the internal bearing of support frame 8041. A gear 8043 and a rotating disk 8049 are fixed to the outer surface of rotating shaft 8042. A dial 8045 is provided on the side of gear 8043 away from rotating shaft 8042. Connecting arm 803 is hingedly connected between reciprocating seat 802 and slide 506. Specifically, display member 804 also includes a docking shaft 80451 provided on dial 8045. One end of docking shaft 80451 is fixed to rotating shaft 8042, and a pointer 80452 is fixed to the outer surface of docking shaft 80451. A rack 8044 is fixed to the outer wall of reciprocating seat 802, meshing with gear 8043, converting the reciprocating motion of reciprocating seat 802 into rotational motion of rotating shaft 8042. The real-time indication of pointer 80452 on dial 8045 allows the operator to intuitively understand pressure changes during the test, facilitating quick on-site assessment of elevator performance and enabling data visualization and real-time monitoring. Guide bars are also fixed to the top surface of bracket 501, guiding reciprocating seat 802. A limit bracket, fixed to the top surface of bracket 501, is mounted on the other end of docking shaft 80451.

[0041] The infusion component 805 includes a piston cylinder 8051 fixed to the upper surface of the bracket 501, and two check valves 8052 are fixed on the outer wall of the piston cylinder 8051, two of which are symmetrically arranged. The interior of the piston cylinder 8051 is slidably abutted against a piston block 8053, and a connecting shaft 8048 is fixed to the outer wall of the piston block 8053, and an annular frame 8047 is fixed to the other end of the connecting shaft 8048. A roller 8046 is provided on the outer surface of the turntable 8049 for rolling cooperation with the annular frame 8047. A connecting pipe 806 is fixed to one end of the two check valves 8052, and the two connecting pipes 806 are fixedly connected to the nozzle 7 and the liquid storage tank 801 respectively. The piston cylinder 8051 forms a lubricant circulation system with the nozzle 7 through the check valve 8052. The connecting pipe 806 connects the liquid storage tank 801 and the nozzle 7 respectively, ensuring that the lubricant is accurately sprayed onto the matching surface of the guide block 11 and the guide groove 21, simulating the actual working lubrication conditions. At the same time, it can perform extreme working condition verification of unlubricated tests, test the maximum load capacity of the buffer structure 5 and the wear critical value of the guide rail 2 under unlubricated conditions, and determine the safety threshold of the elevator in the event of sudden lubrication failure.

[0042] In order to improve the activity of the lubricant, the synchronous parts include two synchronous wheels 807 fixed to the outer surface of the rotating drum 601 and the outer surface of the stirring shaft 8011, and a synchronous belt 808 is connected between the two synchronous wheels 807.

[0043] The working principle of the above embodiment is:

[0044] When the elevator car body 1 runs along the guide rail 2, the guide block 11 slides in cooperation with the guide groove 21, the swaying device 3 simulates no-load vibration, and the hydraulic buffer telescopic rod 503 contacts the elevator car body 1 through the abutment plate 504, transmitting the vibration energy to the slide 506. The buffer spring 507 and the guide rod 505 work together to absorb the impact energy and limit the movement trajectory of the slide 506. The connecting rod 508 ensures the stability of force transmission.

[0045] The slide 506 drives the abutment shaft 603 to move along the reciprocating groove 602 of the drum 601. The rolling of the ball reduces friction. The reciprocating motion of the abutment shaft 603 drives the drum 601 to rotate, converting linear vibration into rotational motion. The drum 601 drives the stirring shaft 8011 to rotate through the synchronous wheel 807 and the synchronous belt 808 to mix the liquid in the liquid storage tank 801. The displacement of the slide 506 drives the rotating shaft 8042 to rotate through the connecting arm 803. The gear 8043 engages with the rack 8044 to drive the reciprocating seat 802 The reciprocating seat 802 moves linearly along the guide bar, driving the annular frame 8047 through the connecting arm 803. The roller 8046 squeezes the piston block 8053, so that the liquid in the piston cylinder 8051 is transported to the nozzle 7 through the check valve 8052 and the connecting pipe 806. The nozzle 7 sprays the lubricating liquid onto the guide block 11. Then, the elevator car body 1 is moved up and down by the rocking device 3 for a second test. By repeating the same test process for the simulation, the data after lubrication is recorded, and the difference between the two data is compared to analyze the test after lubrication.

[0046] When the rotating shaft 8042 drives the pointer 80452 to indicate the pressure value on the dial 8045 through the docking shaft 80451, the turntable 8049 displays the rotation angle. The acceleration sensor is used to collect the vibration signal of the elevator car body 1. Combined with the liquid pressure data of the liquid storage tank 801, the time-frequency characteristics are extracted through wavelet analysis to evaluate the wear of the elevator guide rail 2, the attenuation performance of the buffer structure 5, and the stability of the transmission structure 6.

[0047] The installation method, connection method or setting method disclosed in this embodiment are all common mechanical connection methods, and can be implemented as long as they can achieve their beneficial effects. In addition, the electrical components appearing in this embodiment are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role. Technicians in this field can control the electrical components through simple programming, and the existing disclosed power connection technology is also common knowledge in this field, so the specific structural composition and working principle will not be described in detail in this embodiment.

[0048] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A no-load elevator safety performance evaluation device based on wavelet analysis, characterized by: The invention comprises a guide rail (2) for guiding an elevator car body (1) and an evaluation device (4) for evaluating the elevator car body (1), wherein the evaluation device (4) is composed of a buffer structure (5), a transmission structure (6), a nozzle (7) and a test structure (8); The buffer structure (5) comprises a bracket (501), a mounting plate (502) is welded to the outer wall of the bracket (501), and a buffer member is fixed to the upper surface of the bracket (501); The transmission structure (6) includes a rotating drum (601) rotatably mounted inside a bracket (501), an abutting shaft (603) connected to a buffer member is provided on the outside of the rotating drum (601), and a reciprocating sliding groove (602) adapted to the abutting shaft (603) is provided inside the rotating drum (601); The test structure (8) is composed of a liquid storage tank (801), a reciprocating seat (802), a display element (804) and an infusion element (805). A stirring shaft (8011) is rotatably installed inside the liquid storage tank (801). A synchronizing element is provided between the stirring shaft (8011) and the rotating drum (601). A connecting arm (803) is provided between the buffer element and the reciprocating seat (802).

2. The device for evaluating elevator safety performance using an unloaded method based on wavelet analysis according to claim 1, characterized in that: A guide groove (21) is provided on the inner side of the guide rail (2), a guide block (11) is fixed on the outer wall of the elevator box (1) and is slidably engaged with the guide groove (21), a swaying device (3) is provided on the top side of the elevator box (1), an acceleration sensor is fixed on the outer wall of the top side of the elevator box (1), and the nozzle (7) is fixed to the outer surface of the bottom side of the guide rail (2).

3. The no-load elevator safety performance evaluation device based on wavelet analysis according to claim 1, characterized in that: The buffer component includes a hydraulic buffer telescopic rod (503) arranged on the upper surface of the bracket (501), a contact plate (504) is fixed on the top side of the hydraulic buffer telescopic rod (503), a guide rod (505) is fixed between the mounting plate (502) and the bracket (501), and a slide seat (506) is sleeved and installed on the outer surface of the guide rod (505), and a buffer spring (507) is fixed between the slide seat (506) and the bracket (501).

4. The device for evaluating elevator safety performance using an unloaded method based on wavelet analysis according to claim 3, characterized in that: A connecting rod (508) is fixed between the abutment plate (504) and the slide seat (506), the buffer spring (507) surrounds the outside of the guide rod (505), the abutment shaft (603) is detachably mounted inside the slide seat (506), and a ball bearing that is rotatably mounted on the end of the abutment shaft (603) and that rolls in a reciprocating slide groove (602) is provided.

5. The device for evaluating elevator safety performance using an unloaded method based on wavelet analysis according to claim 4, characterized in that: The number of the guide rod (505), the buffer spring (507) and the connecting rod (508) is two, the two guide rods (505) and the two connecting rods (508) are symmetrically arranged, and an arc groove is opened inside the sliding seat (506).

6. The device for evaluating elevator safety performance using an unloaded method based on wavelet analysis according to claim 3, characterized in that: The interior of the rotating cylinder (601) is hollow and its two ends are connected vertically. The bottom end of the rotating cylinder (601) passes through the interior of the bracket (501). The hydraulic buffer telescopic rod (503) is located inside the rotating cylinder (601), and the outer surface of the top end of the telescopic sleeve of the hydraulic buffer telescopic rod (503) is fixed with a positioning frame fixed to the outer wall of the mounting plate (502).

7. The device for evaluating elevator safety performance using an unloaded method based on wavelet analysis according to claim 1, characterized in that: The display element (804) includes a support frame (8041) fixed to the upper surface of the bracket (501), a rotating shaft (8042) is installed on the internal bearing of the support frame (8041), a gear (8043) and a rotating disk (8049) are fixed to the outer surface of the rotating shaft (8042), a dial (8045) is provided on the side of the gear (8043) away from the rotating shaft (8042), and the connecting arm (803) is hinged between the reciprocating seat (802) and the sliding seat (506).

8. The no-load elevator safety performance evaluation device based on wavelet analysis according to claim 7, characterized in that: The display member (804) further includes a docking shaft (80451) disposed on the dial (8045), one end of the docking shaft (80451) being fixed to the rotating shaft (8042), and a pointer (80452) being fixed to the outer surface of the docking shaft (80451), a rack (8044) being fixed on the outer wall of the reciprocating seat (802) and being engaged with the gear (8043), and a guide bar for guiding the reciprocating seat (802) being fixed on the upper surface of the bracket (501).

9. The device for evaluating elevator safety performance using an unloaded method based on wavelet analysis according to claim 7, characterized in that: The infusion component (805) includes a piston cylinder (8051) fixed to the upper surface of the bracket (501), two check valves (8052) are fixed on the outer wall of the piston cylinder (8051), and a piston block (8053) is slidably abutted inside the piston cylinder (8051). A connecting shaft (8048) is fixed on the outer wall of the piston block (8053), and an annular frame (8047) is fixed to the other end of the connecting shaft (8048). A roller (8046) that rolls with the annular frame (8047) is provided on the outer surface of the turntable (8049). A connecting pipe (806) is fixed to the separated ends of the two check valves (8052), and the two connecting pipes (806) are fixedly connected to the nozzle (7) and the liquid storage tank (801) respectively.

10. The no-load elevator safety performance evaluation device based on wavelet analysis according to claim 1, characterized in that: The synchronous component comprises two synchronous wheels (807) fixed to the outer surface of the rotating drum (601) and the outer surface of the stirring shaft (8011), and a synchronous belt (808) is connected between the two synchronous wheels (807).

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