An elevator buffer performance test detection device

Abstract

The utility model discloses an elevator buffer performance test detection device applied to detection field, through being equipped with infrared distance sensor no.

Description

Technical Field

[0001] This utility model relates to the field of testing, and in particular to a testing device for the performance of elevator buffers. Background Technology

[0002] Elevator buffers are the last line of defense in an elevator safety system, typically installed at the bottom of the shaft. Their core function is to absorb and dissipate the enormous kinetic energy of the car or counterweight through deformation (such as spring compression or hydraulic damping) in the event of an uncontrolled descent or extreme malfunction that causes the elevator to exceed its designated floor level. This achieves smooth deceleration and safe braking, maximizing passenger safety and equipment integrity. To ensure the effectiveness of elevator buffers, performance testing is required before they leave the factory.

[0003] The existing patent with publication number CN208672289U discloses an elevator buffer reset performance tester. By setting a base, fixing elements, sleeve and other structures on the elevator buffer reset performance tester, and cooperating with a second fixing block, vertical rod, capacitive displacement sensor and other components, the tester is easy to install and disassemble with the elevator buffer, thereby realizing convenient maintenance of the reset performance tester and simplifying the testing process.

[0004] The existing patent with publication number CN203612771U discloses a dynamic tester for the reset performance of elevator hydraulic buffers. By setting a housing, a pull rope sensor and a measurement and control system composed of multiple modules in the dynamic tester for the reset performance of elevator hydraulic buffers, the pull rope is combined with an incremental encoder, so that the test does not need to change the buffer structure, is not limited by environment and type, and can achieve high-precision recovery time measurement with simple operation, and is easy to install.

[0005] The aforementioned prior art discloses a technical solution for detecting the reset time of an elevator buffer using a capacitive displacement sensor, and also discloses a solution for detecting the reset time by using a pull rope in conjunction with an incremental encoder, which simplifies the detection process. However, the prior art still has shortcomings. The existing detection components need to be installed on the surface of the buffer, making the testing operation cumbersome. Furthermore, during the testing process, the impact of the car on the buffer can easily cause the detection components to loosen or fall off, affecting the accuracy of the detection. Utility Model Content

[0006] The core of this invention lies in solving the problems of cumbersome installation of detection components and easy interference with detection accuracy in the prior art by using non-contact dual infrared distance sensors. At the same time, it achieves automatic multiple detections through a hoist-driven simulated car, thereby improving detection efficiency.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] An elevator buffer performance testing device includes a base, on which a clamping assembly for fixing the buffer body is fixedly connected. The buffer body includes a piston column, on which a fixed cylinder is slidably connected. A spring sleeved on the piston column is abutted at the upper end of the fixed cylinder, and the upper end of the spring abuts against the top end of the piston column. A base plate is fixedly connected at the lower end of the fixed cylinder, and the base plate has evenly distributed mounting holes. The clamping assembly includes multiple positioning columns fixedly connected to the upper surface of the base. The positioning columns are configured to cooperate with the mounting holes. A pressure plate is provided above the positioning columns. The pressure plate is used to abut against the upper surface of the base plate to vertically limit the position of the base plate. One end of the pressure plate is fixedly connected to the movable end of a hydraulic cylinder. The fixed end of the hydraulic cylinder is fixedly connected to the base. The hydraulic cylinder drives the pressure plate to move up and down. A vertical frame is fixedly connected to the edge of the base. A top plate is fixedly connected to the upper end of the vertical frame. A winch is fixedly connected to the top plate. A hoisting cable is wound on the winch. A simulated car is fixedly connected to the lower end of the hoisting cable. The simulated car is slidably connected to the vertical frame. The winch drives the simulated car to move up and down through the hoisting cable. An infrared distance sensor is fixedly connected to the base. The transmitter of the infrared distance sensor is positioned opposite to the lower end of the simulated car. The infrared distance sensor is used to detect the vertical distance between the simulated car and the base. An infrared distance sensor is fixedly connected to the center of the lower end of the simulated car. The transmitter of the infrared distance sensor is positioned opposite to the upper end of the buffer body. The infrared distance sensor is used to detect the vertical distance between the simulated car and the buffer body. The winch, infrared distance sensor one, and infrared distance sensor two are connected to the same controller.

[0009] Furthermore, the pressure plate has a flat plate structure with a slot at the bottom for inserting the base plate. The slot is a rectangular groove with openings at both the bottom and right ends. The upper part has an open hollow groove for inserting the fixing cylinder, and the open hollow groove is connected to the slot.

[0010] Furthermore, the upper part of the pressure plate has multiple through holes that are opposite to the positioning posts, and the through holes are connected to the slots.

[0011] Furthermore, the simulated car includes a rectangular frame, with a screw fixedly connected to the center of the bottom surface inside the rectangular frame. Multiple counterweights are sleeved on the screw, and a locking nut is abutted against the upper end of the uppermost counterweight. The locking nut is threadedly fixed to the screw.

[0012] Furthermore, the upper end face of the counterweight plate is provided with a raised ring, and the lower end face of the counterweight plate is provided with an annular groove. The outer wall of the locking nut abuts against the inner wall of the raised ring of the uppermost counterweight plate. A central hole for the screw to pass through is provided at the center of the counterweight plate. The diameter of the central hole is larger than the diameter of the screw. A fixing ring that mates with the annular groove is provided on the inner bottom surface of the rectangular frame.

[0013] Furthermore, the rectangular frame is a rectangular cover with openings at both the front and rear ends. The lower end face of the rectangular frame has a receiving hole for installing the second infrared distance sensor, and the second infrared distance sensor is fixedly connected to the inner wall of the receiving hole.

[0014] Furthermore, a protective cover is slidably connected to the outside of the rectangular frame, and a slider is fixedly connected to the side wall of the rectangular frame facing the vertical frame. The slider extends into the vertical frame and is slidably connected to the vertical frame. A vertical groove is provided on the side wall of the vertical frame for the slider to slide vertically. A sliding groove is provided on the side wall of the protective cover facing the vertical frame. The slider passes through the sliding groove and slides against the inner wall of the sliding groove.

[0015] Furthermore, the protective cover includes a rectangular tube that is slidably fitted onto the lower part of the rectangular frame. An extension plate is fixedly connected to the upper end of the side wall of the rectangular tube facing the vertical frame. A sliding groove is opened on the extension plate and extends to the upper part of the rectangular tube. A limit plate is fixedly connected to the side wall of the slider, and the limit plate slides against the outer wall of the extension plate.

[0016] Furthermore, a rectangular groove is provided on the upper surface of the base, which is opposite to the protective cover. When the protective cover moves down to the base position, it is inserted into the rectangular groove.

[0017] Compared with existing technologies, the advantages of this utility model are: (1) This utility model uses infrared distance sensor one and infrared distance sensor two to record the compression and rebound of the buffer body in a non-contact manner. Compared with the traditional testing device that requires fixing the detection component to the elevator buffer, the installation operation before testing is simpler and the impact of the buffer on the detection component during deformation is reduced, resulting in higher testing accuracy. At the same time, the buffer body is quickly positioned and fixed by the positioning column and pressure plate, which facilitates the quick disassembly and replacement of the buffer body to be tested, further improving the convenience of operation. In addition, the impact test is automatically carried out by the winch, cable and simulated car, which facilitates batch repeated testing and improves the overall testing efficiency.

[0018] (2) This utility model provides a protective cover that is fitted outside the simulated car to protect the buffer body during the collision process, thereby reducing the probability of splashing objects injuring surrounding personnel and equipment and improving the safety of operation. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the transverse cross-sectional structure of the present invention; Figure 3 for Figure 2 Enlarged structural diagram at point A; Figure 4This is a schematic diagram of the exploded assembly structure of the buffer body and clamping assembly in this utility model; Figure 5 This is a bottom-view three-dimensional structural diagram of the pressure plate of this utility model; Figure 6 This is a schematic diagram showing the installation of the buffer body and clamping assembly in this utility model; Figure 7 for Figure 2 Enlarged structural diagram at point B; Figure 8 This is a schematic diagram of the exploded assembly structure of the simulated elevator car in this utility model; Figure 9 This is a three-dimensional structural diagram of the protective cover in this utility model; Figure 10 This is a schematic diagram showing the protective cover in this utility model during testing.

[0020] Explanation of the numbers in the diagram: 1. Base; 101. Rectangular groove; 2. Vertical frame; 201. Vertical slide; 3. Top plate; 4. Buffer body; 401. Piston column; 402. Fixing cylinder; 403. Spring; 404. Base plate; 405. Mounting hole; 5. Clamping assembly; 6. Simulated car; 7. Hoisting cable; 8. Winch; 9. Controller; 10. Protective cover; 1001. Rectangular cylinder; 1002. Extension plate; 10 03. Sliding groove; 11. Positioning post; 12. Pressure plate; 1201. Slot; 1202. Perforation; 1203. Open hollow groove; 13. Hydraulic cylinder; 14. Infrared distance sensor one; 15. Infrared distance sensor two; 16. Rectangular frame; 1601. Fixing ring; 17. Screw; 18. Counterweight plate; 1801. Raised ring; 1802. Annular groove; 19. Locking nut; 20. Slider; 21. Limiting plate. Detailed Implementation

[0021] The technical solution will now be clearly and completely described with reference to the accompanying drawings in the embodiments of this utility model.

[0022] First implementation method Please see Figure 1 , Figure 3 and Figure 4 In one embodiment of this utility model, an elevator buffer performance testing device includes a base 1, on which a clamping assembly 5 for fixing a buffer body 4 is fixedly connected. The buffer body 4 includes a piston column 401, and a fixed cylinder 402 is slidably connected to the piston column 401. A spring 403 sleeved on the piston column 401 is abutted at the upper end of the fixed cylinder 402. The upper end of the spring 403 abuts against the top end of the piston column 401. A base plate 404 is fixedly connected to the lower end of the fixed cylinder 402. The base plate 404 has evenly distributed mounting holes 405. Please see Figure 1 , Figure 3 and Figure 4 The clamping assembly 5 includes multiple positioning posts 11 fixedly connected to the upper end face of the base 1. The positioning posts 11 are configured to cooperate with the mounting holes 405. A pressure plate 12 is provided above the positioning posts 11. The pressure plate 12 is used to abut against the upper end face of the base plate 404 to vertically limit the base plate 404. One end of the pressure plate 12 is fixedly connected to the movable end of the hydraulic cylinder 13. The fixed end of the hydraulic cylinder 13 is fixedly connected to the base 1. The hydraulic cylinder 13 drives the pressure plate 12 to move up and down. A vertical frame 2 is fixedly connected to the edge of the base 1. A top plate 3 is fixedly connected to the upper end of the vertical frame 2. A winch 8 is fixedly connected to the top plate 3. A lifting cable 7 is wound on the winch 8. A simulated car 6 is fixedly connected to the lower end of the lifting cable 7. The simulated car 6 is slidably connected to the vertical frame 2. The winch 8 drives the simulated car 6 to move up and down through the lifting cable 7. Please see Figure 1 , Figure 2 and Figure 7 An infrared distance sensor 14 is fixedly connected to the base 1. The transmitting end of the infrared distance sensor 14 is positioned opposite to the lower end face of the simulated car 6. The infrared distance sensor 14 is used to detect the vertical distance between the simulated car 6 and the base 1. An infrared distance sensor 25 is fixedly connected to the center position of the lower end face of the simulated car 6. The transmitting end of the infrared distance sensor 215 is positioned opposite to the upper end of the buffer body 4. The infrared distance sensor 215 is used to detect the vertical distance between the simulated car 6 and the buffer body 4. The winch 8, the infrared distance sensor 14, and the infrared distance sensor 215 are connected to the same controller 9.

[0023] For details, please refer to Figure 4 , Figure 6 and Figure 10 The buffer performance test includes the following steps: Step 1: Install the buffer. Insert the bottom plate 404 of the buffer body 4 between the pressure plate 12 and the positioning post 11, and align the mounting hole 405 with the positioning post 11. Then, place the buffer body 4 vertically so that the positioning post 11 is inserted into the mounting hole 405. Then, start the hydraulic cylinder 13. The hydraulic cylinder 13 drives the pressure plate 12 to move downward so that the pressure plate 12 abuts against the bottom plate 404, thus completing the clamping and fixing of the buffer body 4. Step two, compression test: First, activate infrared distance sensor 14 and infrared distance sensor 15. Then, start winch 8. Winch 8 lifts the simulated car 6 to the set height via cable 7. Then, start winch 8 again to reverse the direction and quickly release cable 7, causing the simulated car 6 to fall freely. When the simulated car 6 contacts the upper end of the piston column 401 of the buffer body 4, the reading of infrared distance sensor 15 is zero. At this time, start timing and record the value of infrared distance sensor 14. When the value of infrared distance sensor 14 is the minimum, the compression of the buffer body 4 is the maximum. Record the time taken from the start of compression to reaching the maximum compression.

[0024] Step 3, rebound test: restart the winch 8 to disengage the simulated car 6 from the buffer body 4, and record the rebound distance and rebound time of the buffer body 4 through infrared distance sensor 14 and infrared distance sensor 25.

[0025] Specifically, when the value of infrared distance sensor 15 is zero, the simulated car 6 and the buffer body 4 are disengaged. Infrared distance sensor 14 records the change in distance of the buffer body 4 from the maximum compression position to the current position as the rebound value, and records the rebound time. It should be noted that the controller 9 is equipped with a timing module for timing the compression and rebound process. Step four, fatigue test: Repeat steps two and three to test the buffer body 4 multiple times and record the data.

[0026] Compared to traditional elevator buffer testing devices, this invention uses infrared distance sensors 14 and 15 to record the compression and rebound of the buffer body in a non-contact manner. Compared to traditional testing devices that require fixing the testing components to the elevator buffer, this simplifies the installation process before testing and reduces the impact of the buffer on the testing components during deformation, resulting in higher testing accuracy. Simultaneously, the positioning column 11 and pressure plate 12 enable quick positioning and fixing of the buffer body 4, facilitating rapid disassembly and replacement of the buffer body 4 under test, further improving operational convenience. Furthermore, the winch 8, cable 7, and simulated car 6 automatically perform impact tests, facilitating batch repeat testing and improving overall testing efficiency.

[0027] Please see Figure 5 The pressure plate 12 is a flat plate structure with a slot 1201 at the bottom for the bottom plate 404 to be inserted. The slot 1201 is a rectangular groove with openings at the bottom and right ends. The upper part of the slot 1201 has an open hollow groove 1203 for the fixing cylinder 402 to be inserted. The open hollow groove 1203 is connected to the slot 1201.

[0028] Specifically, when installing the buffer body 4, the fixing cylinder 402 is aligned with the open hollow groove 1203, and the base plate 404 is aligned with the slot 1201. Then, the base plate 404 is inserted into the slot 1201. After the base plate 404 is fully inserted into the slot 1201, the mounting hole 405 on the base plate 404 is aligned with the positioning post 11, thereby achieving the positioning and installation of the buffer body 4. The positioning post 11 can limit the horizontal movement of the buffer body 4.

[0029] Please see Figure 5 The upper part of the pressure plate 12 has a plurality of through holes 1202 that are opposite to the positioning post 11, and the through holes 1202 are connected to the slot 1201.

[0030] Specifically, the perforation 1202 allows personnel to further observe the real-time position of the base plate 404 during the insertion of the pressure plate 12. When the pressure plate 12 moves downward and abuts against the base plate 404, the positioning post 11 is inserted into the perforation 1202 of the pressure plate 12, further improving the horizontal limiting capability of the buffer body 4.

[0031] Please see Figure 7 and Figure 8 The simulated car 6 includes a rectangular frame 16. A screw 17 is fixedly connected to the center of the bottom surface of the rectangular frame 16. Multiple counterweights 18 are sleeved on the screw 17. A locking nut 19 is abutted at the upper end of the uppermost counterweight 18. The locking nut 19 is threadedly fixed to the screw 17.

[0032] Specifically, by adjusting the number of counterweights 18, the mass of the simulated car 6 is adjusted, thereby adjusting the gravitational potential energy of the simulated car 6, changing the impact energy when the simulated car 6 hits the buffer body 4, and simulating the impact process of different load cars on the buffer body 4.

[0033] Please see Figure 7 and Figure 8 The upper end face of the counterweight plate 18 is provided with a raised ring 1801, and the lower end face of the counterweight plate 18 is provided with an annular groove 1802. The outer wall of the locking nut 19 abuts against the inner wall of the raised ring 1801 of the uppermost counterweight plate 18. The center of the counterweight plate 18 is provided with a central hole for the screw 17 to pass through. The diameter of the central hole is larger than the diameter of the screw 17. The inner bottom surface of the rectangular frame 16 is provided with a fixing ring 1601 that cooperates with the annular groove 1802.

[0034] Specifically, the counterweights 18 are stably stacked by the insertion and engagement of the protruding rings 1801 and annular grooves 1802 on the adjacent counterweights 18, thereby reducing the impact of the vibration generated by the simulated car 6 during the impact on the counterweights 18.

[0035] Please see Figure 7 and Figure 8The rectangular frame 16 is a rectangular cover with openings at both the front and rear ends. The lower end face of the rectangular frame 16 has a receiving hole for installing the infrared distance sensor 15. The infrared distance sensor 15 is fixedly connected to the inner wall of the receiving hole.

[0036] Specifically, the rectangular frame 16 has openings at the front and rear ends to facilitate the replacement of the counterweight plate 18, and the infrared distance sensor 15 is installed through the receiving hole.

[0037] Second implementation method Based on the first implementation, please refer to Figure 2 , Figure 7 , Figure 8 , Figure 9 and Figure 10 A protective cover 10 is slidably connected to the outside of the rectangular frame 16. A slider 20 is fixedly connected to the side wall of the rectangular frame 16 facing the vertical frame 2. The slider 20 extends into the vertical frame 2 and is slidably connected to the vertical frame 2. A vertical groove 201 is provided on the side wall of the vertical frame 2 for the slider 20 to slide vertically. A sliding groove 1003 is provided on the side wall of the protective cover 10 facing the vertical frame 2. The slider 20 passes through the sliding groove 1003 and slides against the inner wall of the sliding groove 1003.

[0038] Specifically, when the simulated car 6 moves downward, the protective cover 10 first contacts the upper surface of the base 1 to enclose the buffer body 4. During the collision between the simulated car 6 and the buffer body 4, the simulated car 6 moves downward relative to the protective cover 10 to compress the buffer body 4. During the compression process, the protective cover 10 shields the debris generated by the impact or the parts after the buffer is disintegrated, reducing the danger caused by the splashing of debris and protecting the surrounding personnel and equipment.

[0039] Please see Figure 7 , Figure 8 and Figure 9 The protective cover 10 includes a rectangular tube 1001 that is slidably sleeved on the lower part of the rectangular frame 16. An extension plate 1002 is fixedly connected to the upper end of the side wall of the rectangular tube 1001 facing the vertical frame 2. A sliding groove 1003 is opened on the extension plate 1002 and extends to the upper part of the rectangular tube 1001. A limiting plate 21 is fixedly connected to the side wall of the slider 20. The limiting plate 21 slides against the outer wall of the extension plate 1002.

[0040] Specifically, by sliding the rectangular tube 1001 at the lower part of the rectangular frame 16, the rectangular tube 1001 is positioned at the lower part of the rectangular frame 16 under the action of gravity after the simulated car 6 is lifted, preventing the protective cover 10 from blocking the openings at the front and rear ends of the rectangular frame 16, thus facilitating the replacement of the counterweight plate 18. At the same time, by using the extension plate 1002 with the sliding groove 1003 and the slider 20 to support the extension plate 1002, the protective cover 10 is vertically limited, so that when the simulated car 6 rises, the protective cover 10 rises synchronously, avoiding obstruction of the buffer body 4 and hindering the replacement and installation of the buffer body 4.

[0041] Please see Figure 3 , Figure 4 and Figure 10 A rectangular groove 101 is provided on the upper surface of the base 1, which is opposite to the protective cover 10. When the protective cover 10 moves down to the position of the base 1, it is inserted into the rectangular groove 101.

[0042] Specifically, after the lower end of the protective cover 10 is inserted into the rectangular groove 101, the rectangular groove 101 horizontally limits the lower end of the protective cover 10, while the rectangular frame 16 horizontally limits the upper opening of the protective cover 10, thereby improving the horizontal deformation resistance of the protective cover 10 and enhancing the blocking effect against splashing objects.

[0043] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A testing and detection device for the performance of elevator buffers, characterized in that, The device includes a base (1), on which a clamping assembly (5) for fixing a buffer body (4) is fixedly connected. The buffer body (4) includes a piston column (401), and a fixing cylinder (402) is slidably connected to the piston column (401). A spring (403) sleeved on the piston column (401) is abutted at the upper end of the fixing cylinder (402). The upper end of the spring (403) abuts against the top end of the piston column (401). A base plate (404) is fixedly connected to the lower end of the fixing cylinder (402). The base plate (404) has evenly distributed mounting holes (405). The clamping assembly (5) includes multiple positioning posts (11) fixedly connected to the upper surface of the base (1). The positioning posts (11) are configured to cooperate with the mounting holes (405). A pressure plate (12) is provided above the positioning posts (11). The pressure plate (12) is used to abut against the upper surface of the base plate (404) to vertically limit the base plate (404). One end of the pressure plate (12) is fixedly connected to the movable end of a hydraulic cylinder (13). The fixed end of the hydraulic cylinder (13) is fixedly connected to the base (1). The pressure cylinder (13) drives the pressure plate (12) to move up and down. A vertical frame (2) is fixedly connected to the edge of the base (1). A top plate (3) is fixedly connected to the upper end of the vertical frame (2). A winch (8) is fixedly connected to the top plate (3). A hoisting cable (7) is wound on the winch (8). A simulated car (6) is fixedly connected to the lower end of the hoisting cable (7). The simulated car (6) is slidably connected to the vertical frame (2). The winch (8) drives the simulated car (6) to move up and down through the hoisting cable (7). An infrared distance sensor (14) is fixedly connected to the base (1). The transmitting end of the infrared distance sensor (14) is set opposite to the lower end face of the simulated car (6). The infrared distance sensor (14) is used to detect the vertical distance between the simulated car (6) and the base (1). An infrared distance sensor (15) is fixedly connected to the center position of the lower end face of the simulated car (6). The transmitting end of the infrared distance sensor (15) is set opposite to the upper end of the buffer body (4). The infrared distance sensor (15) is used to detect the vertical distance between the simulated car (6) and the buffer body (4). The winch (8), the infrared distance sensor (14) and the infrared distance sensor (15) are connected to the same controller (9).

2. The elevator buffer performance testing device according to claim 1, characterized in that, The pressure plate (12) is a flat plate structure with a slot (1201) for inserting the bottom plate (404) at its lower part. The slot (1201) is a rectangular groove with openings at both the lower and right ends. An open hollow groove (1203) for inserting the fixing cylinder (402) is provided at its upper part. The open hollow groove (1203) is connected to the slot (1201).

3. The elevator buffer performance testing device according to claim 2, characterized in that, The upper part of the pressure plate (12) is provided with a plurality of through holes (1202) that are opposite to the positioning post (11), and the through holes (1202) are connected to the slot (1201).

4. The elevator buffer performance testing device according to claim 1, characterized in that, The simulated car (6) includes a rectangular frame (16), and a screw (17) is fixedly connected to the center of the bottom surface of the rectangular frame (16). Multiple counterweights (18) are sleeved on the screw (17), and a locking nut (19) is abutted against the upper end of the uppermost counterweight (18). The locking nut (19) is threadedly fixed to the screw (17).

5. The elevator buffer performance testing device according to claim 4, characterized in that, The upper end face of the counterweight plate (18) is provided with a raised ring (1801), and the lower end face is provided with an annular groove (1802). The outer wall of the locking nut (19) abuts against the inner wall of the raised ring (1801) of the uppermost counterweight plate (18). The center of the counterweight plate (18) is provided with a central hole for the screw (17) to pass through. The diameter of the central hole is larger than the diameter of the screw (17). The inner bottom surface of the rectangular frame (16) is provided with a fixing ring (1601) that cooperates with the annular groove (1802).

6. The elevator buffer performance testing device according to claim 4, characterized in that, The rectangular frame (16) is a rectangular cover with openings at both the front and rear ends. The lower end face of the rectangular frame (16) has a receiving hole for installing the second infrared distance sensor (15). The second infrared distance sensor (15) is fixedly connected to the inner wall of the receiving hole.

7. The elevator buffer performance testing device according to claim 4, characterized in that, A protective cover (10) is slidably connected to the outside of the rectangular frame (16). A slider (20) is fixedly connected to the side wall of the rectangular frame (16) facing the vertical frame (2). The slider (20) extends into the vertical frame (2) and is slidably connected to the vertical frame (2). A vertical groove (201) is provided on the side wall of the vertical frame (2) for the slider (20) to slide vertically. A sliding groove (1003) is provided on the side wall of the protective cover (10) facing the vertical frame (2). The slider (20) passes through the sliding groove (1003) and slides against the inner wall of the sliding groove (1003).

8. The elevator buffer performance testing device according to claim 7, characterized in that, The protective cover (10) includes a rectangular tube (1001) that is slidably fitted into the lower part of the rectangular frame (16). An extension plate (1002) is fixedly connected to the upper end of the side wall of the rectangular tube (1001) facing the vertical frame (2). A sliding groove (1003) is opened on the extension plate (1002) and extends to the upper part of the rectangular tube (1001). A limiting plate (21) is fixedly connected to the side wall of the slider (20). The limiting plate (21) slides against the outer wall of the extension plate (1002).

9. The elevator buffer performance testing device according to claim 8, characterized in that, The upper surface of the base (1) is provided with a rectangular groove (101) that is opposite to the protective cover (10). When the protective cover (10) moves down to the position of the base (1), it is inserted into the rectangular groove (101).

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