Chair wheel service life testing machine

Abstract

The invention discloses a chair wheel service life testing machine which comprises a supporting bottom plate, one side of the supporting bottom plate is provided with a winding shaft I, the outer side of the winding shaft I is provided with a rubber floor with various surface roughness degrees and used for simulating different use grounds, one side of the supporting bottom plate is provided with a negative pressure part, and the negative pressure part is provided with a pressure sensor. A plurality of air exhaust holes communicated with the negative pressure part are formed in the top of the supporting bottom plate and used for increasing friction force and adsorbing and fixing the rubber floor to the top of the supporting bottom plate, and behaviors such as sudden encountering and slow contact when the chair wheel encounters an obstacle can be accurately simulated by adjusting the inflation degree of the air bag; the arrangement of the stress simulation assembly enables the testing machine to simulate various external forces, including sudden, continuous, slowly increasing and other different external force situations, borne by the chair wheels in the movement process; the impact resistance of the chair wheel and the stability of the chair wheel in long-time use can be evaluated; the testing machine can simulate various conditions of the chair wheel in actual use.

Description

Technical Field

[0001] The invention relates to the technical field of chair wheel testing, in particular to a chair wheel life testing machine. Background Art

[0002] Chair wheels are an important part of office chairs. They bear the weight of the chair and provide users with convenient movement and turning functions. The durability of chair wheels is directly related to the service life and overall performance of office chairs. As a key component of office chairs, the service life of chair wheels directly affects the reliability and durability of the chairs. Therefore, in the production and processing of office chairs, testing the service life of chair wheels is an important part of ensuring product quality and user experience. The existing testing of the service life of chair wheels usually adopts experimental simulation methods. By repeatedly pulling the office chair, the chair wheels are subjected to reciprocating wear tests to simulate the movement and turning process of the chair in daily use. However, the above-mentioned method is only carried out under fixed pressure. It cannot adjust the pressure changes on the top of the office chair according to the actual situation, and cannot better show the various situations in actual use, which is not conducive to a more comprehensive evaluation of the performance and life of the chair wheels. Summary of the invention

[0003] The object of the present invention is to provide a chair wheel life testing machine to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a chair wheel life testing machine, comprising:

[0005] A support base plate, a winding shaft 1 is arranged on one side of the support base plate, a rubber floor with various surface roughness is arranged on the outer side of the winding shaft 1, which is used to simulate different use ground surfaces, a negative pressure part is installed on one side of the support base plate, and a plurality of air extraction holes connected with the negative pressure part are arranged on the top of the support base plate, which are used to increase friction and adsorb and fix the rubber floor on the top of the support base plate;

[0006] A support block, the support block is embedded and installed on the top of the support base plate, and an air bag is installed on the top of the support block, which is used to simulate the presence or absence of obstacles and obstacles of different heights by inflating the air bag;

[0007] A driving mechanism, which is disposed at one end of the supporting base plate and is used to drive the chair wheels to slide back and forth;

[0008] A force simulation component is placed above the support base plate, and the force simulation component includes a magnet mounted on the chair wheel, and a plurality of electromagnets are arranged above the magnet and along the direction of its forward movement;

[0009] During the test, the direction or size of the electromagnet's magnetic poles is changed to simulate the movement of the chair wheels without external force, sudden force, slow force, continuous force, and upward pull.

[0010] Preferably, a winding box 1 and a winding box 2 are fixedly connected on both sides of the supporting bottom plate respectively, the winding shaft 1 is rotatably installed in the winding box 1, and the winding shaft 2 is rotatably connected inside the winding box 2, one end of the rubber floor is fixedly connected to two nylon belts, one end of the nylon belt is fixedly connected to the outer side of the winding shaft 2, and the rubber floors with different friction are placed on the top of the supporting bottom plate for synchronous unwinding and winding.

[0011] Preferably, the winding shaft one and the winding shaft two are connected via a synchronous belt assembly, one end of the supporting base plate is fixedly connected to a reducer, the reducer is a worm gear reducer, the input end of the reducer is fixedly connected to a motor, and the output end of the reducer is fixedly connected to the winding shaft two.

[0012] Preferably, the negative pressure part is a vacuum pump installed at the end of the supporting base plate, the suction end of the vacuum pump is connected to the suction hole through an air duct, the end of the air inlet pipe is fixedly connected with an air inlet pipe connected to a high-pressure air source, the air inlet pipe is connected to the support block through the air duct, and the support block is provided with a through hole connected to the airbag.

[0013] Preferably, the driving mechanism also includes support columns fixedly connected to the two ends of the top of the supporting base plate, a guide slide rod is fixedly connected between the corresponding two support columns, the outer side of the guide slide rod is slidably connected to a movable cross plate, a cylinder 1 is fixedly connected to the middle part of one of the support columns, the output end of the cylinder 1 is fixedly connected to the movable cross plate, a lifting frame is fixedly connected to the middle part of the movable cross plate, and a sliding sleeve is slidably connected to the outer side of the lifting frame.

[0014] Preferably, one end of the sliding sleeve is fixedly connected to a connecting block, a chair wheel for testing is installed at the bottom of the connecting block, a support plate is fixedly connected to the top of the connecting block, a movable plate 2 is adjustably installed on the top of the support plate, and a fixing screw is threadedly connected to the top of the movable plate 2 for fixing the position of the movable plate 2 on the top of the movable plate 1, so as to adjust different force positions.

[0015] Preferably, the force simulation component further comprises a support frame fixedly connected between the tops of the two support columns, the electromagnet is fixedly connected to the bottom of the support frame, the top of the second moving plate is rotatably connected to a rotating shaft, the outer side of the rotating shaft is fixedly connected to an L-shaped frame, the magnet is fixedly connected to the L-shaped frame, the top of the second moving plate is fixedly connected to a worm gear transmission box, the input end of the worm gear transmission box is fixedly connected to a driving handle, and the output end of the worm gear transmission box is fixedly connected to the rotating shaft. Different force angles can be adjusted.

[0016] Preferably, one end of the top of the second movable plate is threadedly connected to a threaded rod, the output end of the threaded rod is rotatably connected to a support rod, the support rod is slidably connected to the second movable plate, and the top of the support rod is threadedly connected to a supporting bolt.

[0017] Compared with the prior art, the beneficial effects of the present invention are: by using a rubber floor made of multiple rubbers with different roughness, the testing machine can simulate the friction of different usage surfaces, thereby evaluating the wear resistance and service life of the chair wheels on different surfaces; the setting of the airbag enables the testing machine to simulate the environment with or without obstacles and obstacles of different heights and hardnesses; by adjusting the inflation degree of the airbag, the behavior of the chair wheels when encountering obstacles can be accurately simulated, such as sudden encounters, slow contacts, etc.; the setting of the force simulation components (including magnets and electromagnets) enables the testing machine to simulate various external forces that the chair wheels are subjected to during movement, including different external force scenarios such as sudden, continuous, and slowly increasing; this helps to evaluate the impact resistance of the chair wheels and their stability in long-term use; the testing machine can simulate a variety of situations in actual use of the chair wheels, including different surfaces, different obstacles, different forces, etc.; this enables developers to more comprehensively evaluate the performance and life of the chair wheels, thereby providing strong support for their setting and improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the synchronous belt assembly of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the movable horizontal plate of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the nylon belt of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the airbag of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the reel-up shaft 1 of the present invention;

[0024] Figure 7 It is a structural schematic diagram of the supporting base plate of the present invention;

[0025] Figure 8 It is a structural schematic diagram of the support frame of the present invention;

[0026] Fig. 9 It is a structural schematic diagram of the movable plate 1 of the present invention;

[0027] Fig.10 This is an enlarged view of point A of the present invention;

[0028] Fig.11 It is an enlarged view of point B of the present invention.

[0029] In the figure: 1. Support base plate; 2. Air inlet pipe; 3. Vacuum pump; 4. Exhaust hole; 5. Support block; 6. Air bag; 7. Winding box 1; 8. Synchronous belt assembly; 9. Winding shaft 1; 10. Nylon belt; 11. Rubber floor; 12. Reducer; 13. Motor; 14. Winding box 2; 15. Winding shaft 2; 16. Support column; 17. Guide slide bar; 18. Moving cross plate; 19. Cylinder 1; 20. Electromagnet; 21. Lifting frame; 22. Sleeve; 23. Connecting block; 24. Support plate; 25. Moving plate 1; 26. Moving plate 2; 27. Magnet; 28. Threaded rod; 29. ​​L-shaped frame; 30. Worm gear transmission box; 31. Driving handle; 32. Support rod; 33. Fixed screw; 35. Support frame. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-Figure 11 The present invention provides a technical solution: a chair wheel life tester, comprising: a support base plate 1, a winding shaft 9 is rotatably connected to one side of the support base plate 1, a rubber floor 11 with various surface roughness is wound on the outer side of the winding shaft 9, the rubber floor 11 is made of a plurality of rubbers with different roughnesses, and is used to simulate different use floors, a negative pressure part is installed on one side of the support base plate 1, and a plurality of air extraction holes 4 connected with the negative pressure part are provided on the top of the support base plate 1, which are used to increase friction and adsorb and fix the rubber floor 11 on the top of the support base plate 1; a support block 5 is embedded and installed on the top of the support base plate 1, and an air bag is installed on the top of the support block 5 6. A groove is provided in the middle of the support block 5, and a hole connected to the airbag 6 is provided in the groove, which is used to simulate the presence or absence of obstacles and obstacles of different heights by inflating the airbag 6; the driving mechanism is placed at one end of the support base plate 1, and is used to drive the chair wheels to slide back and forth; the force simulation component is placed above the support base plate 1, and the force simulation component includes a magnet 27 installed on the chair wheel, and a plurality of electromagnets 20 are provided above the magnet 27 and along the direction of its forward movement; during the test, the direction or size of the magnetic pole of the electromagnet 20 is changed to simulate the situation where the chair wheel is not subjected to external force, is suddenly subjected to force, is slowly subjected to force, is continuously subjected to force, and is pulled upward.

[0032] It should be noted that the present invention is provided with a controller and an operation panel, the chair wheels are installed on the chassis of the office chair, the magnet 27 is installed on the top of the chassis, the chassis is driven to slide back and forth by the driving mechanism, and the chassis drives the chair wheels to reciprocate on the top of the supporting base plate 1, and the airbag 6 is inflated and expanded by inflating the airbag 6. The influence of obstacles, obstacles of different hardness and obstacles of different heights on the life of the chair wheels during use is simulated by the expansion degree and height of the airbag 6, and the rubber floor 11 of the supporting base plate 1 is rolled up. 1 position is replaced, and the rubber floor 11 is fixed on the top of the supporting base plate 1 in conjunction with the negative pressure adsorption of the exhaust hole 4. Different friction forces can be switched as needed to test the service life of the chair wheels in different friction forces. When the driving component drives the chassis to drive the chair wheels to move, the electromagnet 20 at the position is energized, and the direction and magnetic force of the magnetic pole of the electromagnet 20 are adjusted by changing the magnitude and direction of the current. When used in conjunction with the magnet 27, it can simulate the situation where the chair wheels are not subject to external force, are suddenly subjected to force, are slowly subjected to force, are continuously subjected to force, and are pulled upward.

[0033] like Figure 1 , 2 As shown in Figures 3, 4, and 6, a winding box 1 7 and a winding box 2 14 are fixedly connected on both sides of the supporting base plate 1 respectively, a winding shaft 9 is rotatably installed in the winding box 1 7, and the winding box 2 14 is internally rotatably connected with a winding shaft 2 15, one end of the rubber floor 11 is fixedly connected to two nylon belts 10, and one end of the nylon belt 10 is fixedly connected to the outer side of the winding shaft 2 15, which is used for synchronous unwinding and winding. The rubber floor 11 with different friction forces is placed on the top of the supporting base plate 1, and the winding shaft 1 9 and the winding shaft 2 15 are connected through a synchronous belt assembly 8. A reducer 12 is fixedly connected to one end of the supporting base plate 1, and the reducer 12 is a worm gear reducer. The input end of the reducer 12 is fixedly connected to the motor 13, and the output end of the reducer 12 is fixedly connected to the winding shaft 2 15.

[0034] It should be noted that, in the normal state of the present invention, the rubber floor 11 is rolled up on the outside of the winding shaft 9, and the support base plate 1 is in contact with the airbag 6 and the chair wheel. When the roughness of the surface of the support base plate 1 needs to be adjusted, the motor 13 and the reducer 12 drive the winding shaft 15 to rotate, and the winding shaft 15 drives the winding shaft 9 to rotate through the synchronous belt and the synchronous pulley of the synchronous belt assembly 8. The winding shaft 15 winds and rolls the nylon belt 10. During this period, the nylon belt 10 pulls the rubber floor 11 to one end. When the winding shaft 9 rotates, the rubber floor 11 is stretched and unfolded from the outside of the winding shaft 9, so that the rubber floor 11 is placed on the top of the support base plate 1. According to needs, the different positions of the rubber floor 11 are adjusted by winding the winding shaft 15 and placed on the top of the support base plate 1, so as to switch the test ground friction, which is convenient for testing the service life on floors with different friction.

[0035] like Figure 1 , 5 As shown in Figures 6 and 7, the negative pressure part is a vacuum pump 3 installed at the end of the supporting base plate 1. The suction end of the vacuum pump 3 is connected to the suction hole 4 through an air duct. The end of the air inlet pipe 2 is fixedly connected with the air inlet pipe 2 connected to the high-pressure air source. The air inlet pipe 2 is connected to the support block 5 through the air duct. The support block 5 is provided with a through hole connected to the airbag 6.

[0036] It should be noted that, in the present invention, when the rubber floor 11 is rolled up and wrapped around the outside of the reel-up shaft 9, the nylon belt 10 is placed on the top of the support base plate 1. During the test, the support base plate 1 is in contact with the airbag 6 and the chair wheel. The airbag 6 is inflated through the air inlet pipe 2. The airbag can simulate obstacles of different heights and hardnesses by inflating or deflating. This enables the test system to simulate the behavior of the chair wheels when encountering different types of obstacles, such as sudden encounters with obstacles, slow contact, etc. When the rubber floor 11 is laid flat on the top of the support base plate 1, the vacuum pump 3 cooperates with the air extraction hole 4 to make the rubber floor 11 adsorbed and fixed on the top of the support base plate 1, so as to prevent the rubber floor 11 from being offset or uneven when the chair wheels are pushed for testing.

[0037] like Figure 1 , 2 As shown in , 3, 8, and 9, the driving mechanism also includes support columns 16 fixedly connected to the two ends of the top of the support base plate 1, and a guide slide bar 17 is fixedly connected between the two corresponding support columns 16. A movable cross plate 18 is slidably connected to the outer side of the guide slide bar 17, and a cylinder 19 is fixedly connected to the middle part of one of the support columns 16, and the output end of the cylinder 19 is fixedly connected to the movable cross plate 18. A lifting frame 21 is fixedly connected to the middle part of the movable cross plate 18, and a sliding sleeve 22 is slidably connected to the outer side of the lifting frame 21. One end of the sliding sleeve 22 is fixedly connected to a connecting block 23, and a chair wheel for testing is installed at the bottom of the connecting block 23. A support plate 24 is fixedly connected to the top of the connecting block 23, and a movable plate 26 is adjustably installed on the top of the support plate 24. The top of the movable plate 26 is threadedly connected with a fixing screw 33, which is used to fix the position of the movable plate 26 at the top of the movable plate 1 25, so as to adjust different force positions.

[0038] It should be noted that the cylinder 19 of the present invention is a reciprocating cylinder. The connecting block 23 is installed on the chassis with the chair wheels, and then the connecting block 23 is connected to the lifting frame 21 through the sliding sleeve 22. The sliding sleeve 22 slides up and down on the outside of the lifting frame 21, so that the connecting block 23 can move up and down when it is subjected to force. The cylinder 19 drives the moving cross plate 18 to slide on the outside of the guide slide rod 17, thereby driving the connecting block 23 to move through the moving cross plate 18 and the lifting frame 21. In this way, the cylinder 19 drives the chair wheels to move back and forth on the top of the supporting base plate 1 or the rubber floor 11, through After the movable plate 25 slides on the outside of the support plate 24, the movable plate 25 is fixed to the outside of the support plate 24 by screws. By adjusting the position of the movable plate 26 on the top of the movable plate 25, the movable plate 26 is fixed by fixing the screw 33 against the movable plate 25, so as to adjust the position of the magnet 27 on the top of the support plate 24 along the X-axis and the Y-axis. By adjusting the position of the magnet 27 and cooperating with the repulsive force of the top electromagnet 20, the experimenter can accurately control the force position of the chair wheel, simulating the movement of the chair wheels under different force conditions when the office chair is in different sitting postures.

[0039] like Figure 8 , 9 As shown in Figures 10 and 11, the force simulation component also includes a support frame 35 fixedly connected between the tops of the two support columns 16, an electromagnet 20 fixedly connected to the bottom of the support frame 35, a rotating shaft is rotatably connected to the top of the second moving plate 26, an L-shaped frame 29 is fixedly connected to the outer side of the rotating shaft, a magnet 27 is fixedly connected to the L-shaped frame 29, a worm gear transmission box 30 is fixedly connected to the top of the second moving plate 26, a driving handle 31 is fixedly connected to the input end of the worm gear transmission box 30, and an output end of the worm gear transmission box 30 is fixedly connected to the rotating shaft. To adjust different force angles, a threaded rod 28 is threadedly connected to one end of the top of the second moving plate 26, a support rod 32 is rotatably connected to the output end of the threaded rod 28, the support rod 32 is slidably connected to the second moving plate 26, and a supporting bolt is threadedly connected to the top of the support rod 32.

[0040] It should be noted that the support frame 35 of the present invention is located directly above the movement path of the chair wheel. It is a fixed base for the electromagnet and other force-bearing components. The electromagnet is fixed at the bottom of the support frame. By changing the current direction and size of the electromagnet, the magnetic field strength and magnetic pole direction are changed, so that its magnetic pole can control the external force applied to the test chair wheel. This makes it possible to simulate various force conditions encountered by the chair wheel during actual use, including different external force scenarios such as sudden, continuous, and slowly increasing. The magnetic poles of the magnet 27 are the same as or opposite to the magnetic poles of the electromagnet 20 to simulate the force on the chair wheel. By adjusting the magnetic force of the electromagnet 20, a variety of different force scenarios can be simulated: when there is no external force, the electromagnet 20 is not energized, and the magnetic field is set to zero or very small, simulating the situation where the chair wheel is not subjected to external force. When the force is suddenly applied, and by energizing the electromagnet 20, the magnetic poles of the magnet 27 are the same as the magnetic poles of the electromagnet 20, simulating the external force suddenly applied to the chair wheel during use, so that its impact resistance can also be tested. When the force is applied slowly, multiple electromagnets 20 are energized and the current gradually increases along the direction of movement, so that the magnetic field gradually increases. Under the action of the repulsive force between the electromagnets 20 and the magnets 27, the load of the chair wheel gradually increases during movement. When the force is applied continuously, the magnetic poles of the electromagnets 20 are the same as the magnetic poles of the magnets 27, and the repulsive force between the two is maintained at a constant level, simulating the continuous force state of the chair wheel during long-term use. When pulling upward, by changing the direction of the electromagnet 20, the magnetic pole of the electromagnet 20 is opposite to the magnetic pole of the magnet 27, so that the chair wheel is subjected to an upward pulling force, simulating the reverse force that the chair wheel may encounter in a specific usage scenario, so that the service life of the chair wheel when subjected to pulling force can be detected, and the angle of the rotating shaft is adjusted by driving the handle 31 and the worm gear transmission box 30, so as to adjust the angle of the orientation of the magnet 27 through the L-shaped frame 29, and the support rod 32 is pushed forward by the threaded rod 28 so that the support rod 32 and the top bolt are supported from the bottom of the L-shaped frame 29, so as to ensure that the orientation of the magnet 27 is fixed, under the action of the repulsive force generated by the electromagnet 20 and the magnet 27, the service life of the chair wheel when subjected to forces at different angles can be detected.

[0041] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0043] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0044] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A chair wheel life testing machine, characterized in that: include: A support base plate (1), wherein a reel-up shaft (9) is disposed on one side of the support base plate (1), and a rubber floor (11) with a surface roughness of various degrees is disposed on the outer side of the reel-up shaft (9) for simulating different ground surfaces for use, a negative pressure portion is installed on one side of the support base plate (1), and a plurality of air extraction holes (4) in communication with the negative pressure portion are disposed on the top of the support base plate (1) for increasing friction and adsorbing and fixing the rubber floor (11) on the top of the support base plate (1); A support block (5), the support block (5) is embedded and installed on the top of the support base plate (1), and an air bag (6) is installed on the top of the support block (5), which is used to simulate the presence or absence of obstacles, obstacles of different hardness, and obstacles of different heights by inflating the air bag (6); A driving mechanism, which is disposed at one end of the supporting base plate (1) and is used to drive the chair wheels to slide back and forth; A force simulation component, the force simulation component is placed above the support base plate (1), the force simulation component comprises a magnet (27) mounted on the chair wheel, and a plurality of electromagnets (20) are arranged above the magnet (27) and along the direction of its forward movement; During the test, the direction or size of the magnetic pole of the electromagnet (20) is changed to simulate the situation that the chair wheel is not subjected to external force, is suddenly subjected to force, is slowly subjected to force, is continuously subjected to force, and is pulled upward.

2. The chair wheel life testing machine according to claim 1, characterized in that: The two sides of the support base plate (1) are respectively fixedly connected with a winding box one (7) and a winding box two (14); the winding shaft one (9) is rotatably installed in the winding box one (7); the winding box two (14) is rotatably connected to the winding shaft two (15); one end of the rubber floor (11) is fixedly connected with two nylon belts (10); one end of the nylon belt (10) is fixedly connected to the outer side of the winding shaft two (15), and the rubber floor (11) with different friction forces is placed on the top of the support base plate (1) for synchronous unwinding and winding.

3. The chair wheel life testing machine according to claim 2, characterized in that: The winding shaft one (9) and the winding shaft two (15) are connected by a synchronous belt assembly (8); one end of the supporting base plate (1) is fixedly connected to a reducer (12); the reducer (12) is a worm gear reducer; the input end of the reducer (12) is fixedly connected to a motor (13); and the output end of the reducer (12) is fixedly connected to the winding shaft two (15).

4. The chair wheel life testing machine according to claim 1, characterized in that: The negative pressure part is a vacuum pump (3) installed at the end of the supporting base plate (1); the suction end of the vacuum pump (3) is connected to the suction hole (4) through an air duct; the end of the air intake pipe (2) is fixedly connected to an air intake pipe (2) connected to a high-pressure air source; the air intake pipe (2) is connected to a supporting block (5) through the air duct; and the supporting block (5) is provided with a through hole connected to the air bag (6).

5. The chair wheel life testing machine according to claim 1, characterized in that: The driving mechanism also includes support columns (16) fixedly connected to the two ends of the top of the support base plate (1), a guide slide bar (17) fixedly connected between the two corresponding support columns (16), the outer side of the guide slide bar (17) is slidably connected to a movable cross plate (18), a cylinder 1 (19) is fixedly connected to the middle of one of the support columns (16), the output end of the cylinder 1 (19) is fixedly connected to the movable cross plate (18), a lifting frame (21) is fixedly connected to the middle of the movable cross plate (18), and a sliding sleeve (22) is slidably connected to the outer side of the lifting frame (21).

6. The chair wheel life testing machine according to claim 5, characterized in that: One end of the sliding sleeve (22) is fixedly connected to a connecting block (23), a chair wheel for testing is installed at the bottom of the connecting block (23), a support plate (24) is fixedly connected to the top of the connecting block (23), a movable plate 2 (26) is adjustably installed on the top of the support plate (24), and a fixing screw (33) is threadedly connected to the top of the movable plate 2 (26) for fixing the position of the movable plate 2 (26) at the top of the movable plate 1 (25) to adjust different force-bearing positions.

7. The chair wheel life testing machine according to claim 5, characterized in that: The force simulation component also includes a support frame (35) fixedly connected between the tops of the two support columns (16), the electromagnet (20) is fixedly connected to the bottom of the support frame (35), the top of the second moving plate (26) is rotatably connected to a rotating shaft, the outer side of the rotating shaft is fixedly connected to an L-shaped frame (29), the magnet (27) is fixedly connected to the L-shaped frame (29), the top of the second moving plate (26) is fixedly connected to a worm gear transmission box (30), the input end of the worm gear transmission box (30) is fixedly connected to a driving handle (31), and the output end of the worm gear transmission box (30) is fixedly connected to the rotating shaft to adjust different force angles.

8. The chair wheel life testing machine according to claim 7, characterized in that: One end of the top of the second movable plate (26) is threadedly connected to a threaded rod (28), the output end of the threaded rod (28) is rotatably connected to a support rod (32), the support rod (32) is slidably connected to the second movable plate (26), and the top of the support rod (32) is threadedly connected to a supporting bolt.

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