An office chair endurance testing device

Abstract

The present invention discloses an endurance testing device for an office chair, including a testing platform and a limit frame, a servo motor and a plurality of clamping rods installed on the top of the testing platform. A telescopic cylinder is fixedly arranged on the top of the testing platform through a support rod, a piston cylinder that moves up and down is sleeved on the bottom of the telescopic cylinder, a pressing plate is fixedly arranged on the bottom of the piston cylinder, and a limit rod that passes through the top of the piston cylinder to limit it is fixedly arranged on the inner wall of the telescopic cylinder; a compression assembly that cooperates with each other to compress air through positive and negative lead screws is connected to the side of the piston cylinder. The inner compression cylinder in the present invention is sleeved inside the outer compression cylinder, and the higher the air pressure inside the outer compression cylinder and the inner compression cylinder, the larger the contact area between the inner compression cylinder and the inner compression cylinder, and the better the sealing performance is when the air is compressed, which can ensure that the compressed air inside the inner compression cylinder and the inner compression cylinder cannot leak, and has the advantages of good sealing performance and high air compression efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of office chairs, and in particular to an office chair endurance detection device. Background Art

[0002] Office chairs are essential tools for modern offices. After the office chairs are manufactured, they need to be tested by a force testing device to apply pressure to the top of the chairs to test their ability to withstand pressure. The force testing device generally generates pressure by hydraulic means, but due to the high density of the hydraulic oil, the pressure increases very high every second, and the bearing limit of the office chair cannot be accurately detected. The detection accuracy is not enough;

[0003] The endurance detection device in the prior art uses the fact that air is easily compressed due to its low density. The compressed air generates pressure to act on the office chair, and the air is compressed by the piston. However, the air compression efficiency is low due to the insufficient drop of the piston, which greatly prolongs the detection time. In addition, the air compression process requires the use of a swing check valve. The movable plate inside the swing check valve cannot be supported after being lifted up by the air. The movable plate will hinder the flow of air and affect the air compression efficiency.

[0004] Therefore, it is necessary to provide an office chair endurance detection device. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that air is easily compressed due to its low density, and pressure is generated by compressed air to act on the office chair. The air is compressed by a piston, but the air compression efficiency is low due to insufficient drop of the piston, which greatly prolongs the detection time. In addition, the air compression process requires the cooperation of a swing check valve, and the movable plate inside the swing check valve cannot be supported after being lifted up by the air. The movable plate will hinder the flow of air and affect the air compression efficiency. Therefore, an office chair endurance detection device is proposed.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an office chair endurance testing device, comprising a testing platform and a limit frame, a servo motor and a plurality of clamping rods installed on the top of the testing platform; a telescopic cylinder is fixedly arranged on the top of the testing platform through a support rod, a piston cylinder that moves up and down is sleeved on the bottom of the telescopic cylinder, a pressing plate is fixedly arranged on the bottom of the piston cylinder, and a limit rod that passes through the top of the piston cylinder to limit it is fixedly arranged on the inner wall of the telescopic cylinder; a compression assembly that compresses air through positive and negative lead screws is connected to the side of the piston cylinder; the compression assembly comprises a positive lead screw lever, a center block, a negative lead screw lever, a lead screw ring, an external pressure A telescopic cylinder, an inner compression cylinder, a connecting pipe, a check box and a hose, a positive wire lever is fixedly arranged on the power output end at the top of the servo motor, a center block and a reverse wire lever are fixed on the top of the positive wire lever, screw rings are threadedly sleeved on the peripheries of the reverse wire lever and the positive wire lever, an outer compression cylinder and an inner compression cylinder for moving compressed air in opposite directions are fixed on the peripheries of the two screw rings, connecting pipes are embedded on both sides of the outer compression cylinder, a check box with a check function is arranged at the end of the connecting pipe, a hose connected to the telescopic cylinder is arranged at the end of the check box, and piston rings are sleeved on the surfaces of the inner compression cylinder and the piston cylinder.

[0007] Further preferably, the check box includes a bevel gear rod, a tilting rod, a clamping plate, a movable rod, a check plate, a rubber ring, a check rod, a limit plate, a check block and a lift plate, the inner wall of the check box is fixed with a bevel gear rod and a tilting rod that remain parallel, the inner wall of the check box is fixed with two clamping plates, the hollow spaces of the two clamping plates are provided with a movable rod through rotation, the end of the movable rod is fixed with a check plate covering the inner wall of the check box, a rubber ring is provided on one side of the check plate, the other side of the check plate is hinged with a check rod through a hinge, two limit plates that clamp the bevel gear rod are fixed to the end of the check rod, and a check block and a lift plate are fixed between the two limit plates.

[0008] Further preferably, a plurality of latching teeth are provided at the lower left of the check block, the lift plate is kept tilted and located at the upper left of the check block, and the position of the lift plate and the position of the latching teeth are kept symmetrical with respect to the center of the check block.

[0009] Further preferably, the check block is located at the center of the check block, and a plurality of slots are provided on the top of the helical gear rod, and the teeth of the check block are stuck in the slots of the helical gear rod.

[0010] Further preferably, pin holes symmetrically positioned to each other are respectively provided on both sides of the check box, a hose and three connecting pipes are respectively connected to the pin holes of the two check boxes, and rubber rings are tightly attached to the ends of the hose and the connecting pipes.

[0011] Further preferably, the slot of the helical gear rod is in the shape of a right-angled triangle, the check rod is higher on the left and lower on the right and remains inclined, the check plate is movable, and after the check plate is vertically downward, the rubber ring is tightly attached to the pipe mouth of the connecting pipe.

[0012] Further preferably, the helical gear rod is higher on the left and lower on the right, maintaining an inclination of 30°, and the helical gear rod is higher on the left and lower on the right, maintaining an inclination of 30°.

[0013] Further preferably, the clamping rods are respectively located on the front and back sides of the connecting tube, the interiors of the two check boxes remain connected from right to left, and the two check boxes are symmetrically arranged on both sides of the outer compression cylinder.

[0014] Further preferably, the outer compression cylinder is sleeved on the periphery of the inner compression cylinder, the overlapping length of the outer compression cylinder and the inner compression cylinder is inversely proportional to the size of the space formed inside them, and the piston ring surrounds the inner wall of the outer compression cylinder.

[0015] Further preferably, a pressure sensor and a wireless transceiver are provided on the top of the inner wall of the telescopic cylinder, the length of the limit rod is greater than the length of the piston cylinder, and the positive wire lever, the center block and the negative wire lever are stacked and fixed in sequence from bottom to top.

[0016] The beneficial effects of the present invention are:

[0017] 1. The positive wire lever and the reverse wire lever rotate synchronously to drive the outer compression cylinder and the inner compression cylinder to approach each other. The air is compressed between the outer compression cylinder and the inner compression cylinder. The compressed air enters the telescopic cylinder to drive the piston cylinder to generate pressure, which can drive the outer compression cylinder and the inner compression cylinder to move at the same time, compressing the air quickly, and has the advantage of high air compression efficiency.

[0018] 2. The inner compression cylinder is sleeved inside the outer compression cylinder. The higher the air pressure inside the outer compression cylinder and the inner compression cylinder, the larger the contact area between the inner compression cylinder and the inner compression cylinder. The more compressed the air, the better the sealing. This can ensure that the compressed air inside the inner compression cylinder and the inner compression cylinder cannot leak. It has the advantages of good sealing and high air compression efficiency.

[0019] 3. After the check plate is lifted up by the compressed air, the check rod pushes the limit plate, the check block and the lift plate to climb along the top of the bevel gear rod, and the teeth of the check block are inserted into the grooves of the bevel gear rod to support the check plate. The downward gravity of the check plate cannot act on the compressed air, reducing the resistance of the compressed air inside the check box and making the compressed air flow quickly, thereby increasing the air compression efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the use of the present invention as a whole;

[0022] Figure 3 is an enlarged schematic diagram of the compression assembly of the present invention;

[0023] Figure 4 It is a schematic diagram of the use of the compression assembly of the present invention;

[0024] Figure 5 It is an enlarged schematic diagram of the check box of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the helical gear rod of the present invention;

[0026] Figure 7 It is a structural schematic diagram of the limiting plate of the present invention;

[0027] Figure 8 It is a structural schematic diagram of the check block of the present invention;

[0028] Fig. 9 For the present invention Figure 5 A magnified schematic diagram of center A.

[0029] In the figure: testing platform 1, limit frame 2, servo motor 3, clamping rod 4, telescopic cylinder 5, piston cylinder 6, pressing plate 7, limit rod 8, positive thread lever 9, center block 10, negative thread lever 11, screw ring 12, outer compression cylinder 13, inner compression cylinder 14, connecting pipe 15, check box 16, bevel gear rod 161, tilt rod 162, clamping plate 163, movable rod 164, check plate 165, rubber ring 166, check rod 167, limit plate 168, check block 169, lift plate 1610, latch tooth 1611, hose 17, piston ring 18. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Reference Figure 1-9, an office chair endurance testing device, comprising a testing platform 1 and a limit frame 2, a servo motor 3 and a plurality of clamping rods 4 installed on the top of the testing platform 1, a telescopic cylinder 5 is fixedly arranged on the top of the testing platform 1 through a support rod, a piston cylinder 6 that moves up and down is sleeved on the bottom of the telescopic cylinder 5, a pressing plate 7 is fixedly arranged on the bottom of the piston cylinder 6, and a limit rod 8 that passes through the top of the piston cylinder 6 to limit it is fixedly arranged on the inner wall of the telescopic cylinder 5; a compression assembly that compresses air through positive and negative lead screws is connected to the side of the piston cylinder 6; the compression assembly comprises a positive lead lever 9, a center block 10, a negative lead lever 11, a lead screw ring 12, an outer compression cylinder 13, an inner compression cylinder 14, a connecting pipe 15, a check box 16 and a soft Tube 17, a positive wire lever 9 is fixedly arranged on the power output end at the top of the servo motor 3, a center block 10 and a reverse wire lever 11 fixed on the top of the positive wire lever 9 are fixed, the periphery of the reverse wire lever 11 and the positive wire lever 9 are both threadedly sleeved with a screw ring 12, the periphery of the two screw rings 12 is sleeved and fixed with an outer compression cylinder 13 and an inner compression cylinder 14 for moving compressed air in opposite directions, connecting pipes 15 are embedded on both sides of the outer compression cylinder 13, a check box 16 with a check function is arranged at the end of the connecting pipe 15, a hose 17 connected to the telescopic cylinder 5 is arranged at the end of the check box 16, and the surfaces of the inner compression cylinder 14 and the piston cylinder 6 are sleeved with piston rings 18.

[0032] Preferably, the check box 16 includes a helical gear rod 161, a tilt rod 162, a clamping plate 163, a movable rod 164, a check plate 165, a rubber ring 166, a check rod 167, a limit plate 168, a check block 169 and a lift plate 1610. The inner wall of the check box 16 is fixed with a helical gear rod 161 and a tilt rod 162 that are kept parallel. The inner wall of the check box 16 is fixed with two clamping plates 163. The hollows of the two clamping plates 163 are rotated. A movable rod 164 is provided for movement, a check plate 165 covering the inner wall of the check box 16 is fixed at the end of the movable rod 164, a rubber ring 166 is provided on one side of the check plate 165, a check rod 167 is hinged on the other side of the check plate 165 through a hinge, two limit plates 168 clamping the helical gear rod 161 are fixed at the end of the check rod 167, and a check block 169 and a lift plate 1610 are fixed between the two limit plates 168;

[0033] During specific implementation, after the check plate 165 is lifted up by the compressed air, the check rod 167 pushes the limit plate 168, the check block 169 and the lift plate 1610 to climb up along the top of the bevel gear rod 161, and the latching tooth 1611 of the check block 169 moves upward along the bevel gear rod 161, and then the latching tooth 1611 of the check block 169 is inserted into the latching groove of the bevel gear rod 161, so that the check block 169 cannot move downward along the bevel gear rod 161, so that the check plate 165 is supported, and the downward gravity of the check plate 165 cannot act on the compressed air, so that the resistance of the compressed air inside the check box 16 is reduced, and the compressed air flows quickly, thereby increasing the air compression efficiency. When blowing, the air first blows on the lift plate 1610. The inclined state of the lift plate 1610 generates an upward lift, which makes the limit plate 168, the check block 169 and the lift plate 1610 move upward synchronously, and the check block 169 is against the bottom of the tilt rod 162, and the latch tooth 1611 falls off from the slot, and the support for the check plate 165 disappears. The check plate 165 moves downward due to gravity, and the check plate 165 covers the inner wall of the check box 16. The air inside the check box 16 stops flowing, the lift of the lift plate 1610 disappears, and the latch tooth 1611 of the check block 169 is re-stuck in the slot, making the inside of the check box 16 unidirectional and realizing the non-return function.

[0034] Preferably, a plurality of latch teeth 1611 are provided at the lower left of the check block 169, and the lift plate 1610 is kept tilted and located at the upper left of the check block 169. The position of the lift plate 1610 and the position of the latch teeth 1611 are kept symmetrical with respect to the center of the check block 169. The tilt of the lift plate 1610 will generate an upward lift when blown by the horizontal airflow, causing the check block 169 to automatically move upward.

[0035] Preferably, the bevel gear rod 161 is higher on the left and lower on the right, maintaining an inclination of 30°, and the inclination rod 162 is higher on the left and lower on the right, maintaining an inclination of 30°, the slot of the bevel gear rod 161 is in the shape of a right-angled triangle, the check rod 167 is higher on the left and lower on the right and maintains an inclination, the check plate 165 is movable, and after the check plate 165 is vertically downward, the rubber ring 15 is tightly attached to the pipe mouth of the connecting pipe 15, the check block 169 is located at the center of the check block 169, and several slots are opened on the top of the bevel gear rod 161. The tooth 1611 of the check block 169 is stuck in the slot of the bevel gear rod 161. The shape of the tooth 1611 and the shape of the slot allow the tooth 1611 to move upward along the bevel gear rod 161, but the tooth 1611 cannot move downward along the bevel gear rod 161, so that the check plate 165 is supported after being lifted, preventing the gravity of the check plate 165 from generating resistance to the flow rate of the compressed air.

[0036] Preferably, pin holes symmetrically positioned are respectively provided on both sides of the check box 16, and a hose 17 and three connecting pipes 15 are respectively connected to the pin holes of the two check boxes 16. The rubber ring 166 is tightly attached to the ends of the hose 17 and the connecting pipe 15. The two check boxes 16 are unidirectionally conductive, so that the outside air is continuously sucked into the outer compression cylinder 13 through the connecting pipe 15 for compression. The compressed air enters the telescopic cylinder 5 through the connecting pipe 15, the check box 16 and the hose 17, pushing the piston cylinder 6 to move downward and generating pressure on the office chair.

[0037] Preferably, the clamping rod 4 is respectively located on the front and back sides of the connecting tube 15, the interiors of the two check boxes 16 remain connected from right to left, and the two check boxes 16 are symmetrically arranged on both sides of the outer compression cylinder 13. The clamping rod 4 clamps the connecting rod 15 to prevent the outer compression cylinder 13 from rotating, so that the outer compression cylinder 13 moves up and down around the positive screw 9.

[0038] Preferably, the outer compression cylinder 13 is sleeved on the outer periphery of the inner compression cylinder 14, and the overlapping length of the outer compression cylinder 13 and the inner compression cylinder 14 is inversely proportional to the size of the space formed inside them. The piston ring 18 surrounds the inner wall of the outer compression cylinder 13.

[0039] During specific implementation, the inner compression cylinder 14 is sleeved inside the outer compression cylinder 13. The higher the air pressure inside the outer compression cylinder 13 and the inner compression cylinder 14, the larger the contact area between the inner compression cylinder 14 and the inner compression cylinder 13. The more compressed the air, the better the sealing performance, which can ensure that the compressed air inside the inner and outer compression cylinders 13 and the inner compression cylinder 14 cannot leak.

[0040] Preferably, a pressure sensor and a wireless transceiver are provided on the top of the inner wall of the telescopic cylinder 5, the length of the limit rod 8 is greater than the length of the piston cylinder 6, the positive thread lever 9, the center block 10 and the negative thread lever 11 are stacked and fixed in sequence from bottom to top, and the pressure sensor detects the air pressure of the compressed air inside the telescopic cylinder 5, and then detects the pressure of the piston cylinder 6 acting downward on the office chair, so as to accurately detect the ultimate pressure that the office chair can withstand.

[0041] Among them, an exhaust pipe is arranged on the side of the telescopic cylinder 5, and a threaded cover is threadedly sleeved on the end of the exhaust pipe. After the threaded cover is removed, the air inside the telescopic cylinder 5 can be discharged through the exhaust pipe, completing the resetting work of the telescopic cylinder 5.

[0042] In the present invention, when in use, first, the office chair is placed in the limit frame 2 on the top of the inspection table 1, and then the servo motor 3 drives the positive wire lever 9, the center block 10, and the reverse wire lever 11 to rotate synchronously, so that the outer compression cylinder 13 moves upward on the positive wire lever 9, and the inner compression cylinder 14 moves downward on the reverse wire lever 11, and the air is compressed on the inner wall of the outer compression cylinder 13, and the compressed air is pushed through the connecting pipe 15 on the left side of the outer compression cylinder 13 into the inside of the check box 16, and the compressed air lifts the check plate 165 inside the check box 16, and the compressed air enters the check box 16, and then the compressed air hose 17 enters the extension Inside the telescopic cylinder 5, the compressed air pushes the piston cylinder 6 and the pressing plate 7 to move downward, and the pressing plate 7 rests on the office chair. The pressure sensor inside the telescopic cylinder 5 detects the air pressure inside the column in real time. When the check plate 165 is lifted, the check rod 167 pushes the limit plate 168, the check block 169 and the lifting plate 1610 to climb along the top of the bevel gear rod 161, and the tooth 1611 of the check block 169 moves upward along the bevel gear rod 161. Then, the tooth 1611 of the check block 169 is inserted into the groove of the bevel gear rod 161, so that the check block 169 cannot move downward along the bevel gear rod 161, so that the check plate 165 is The servo motor 3 drives the positive wire lever 9, the center block 10 and the negative wire lever 11 to transmit in the reverse direction, so that the outer compression cylinder 13 moves downward on the positive wire lever 9 and the inner compression cylinder 14 moves upward on the negative wire lever 11. The air flows from right to left in the check box 16. The air first blows on the lift plate 1610. The inclined state of the lift plate 1610 generates an upward lift, thereby causing the limit plate 168, the check block 169 and the lift plate 1610 to move upward synchronously. The check block 169 and the bottom of the tilt rod 162 are pressed against each other, and the air is blocked. The tooth 1611 falls off from the slot, and the support for the check plate 165 disappears. The check plate 165 moves downward due to gravity, and the check plate 165 covers the inner wall of the check box 16 to prevent the air inside the hose 17 from returning to the outer compression cylinder 13. The check plate 165 of the other check box 16 is lifted up, and the outside air is sucked into the outer compression cylinder 13 through the check box 16 and the connecting pipe 15 and then compressed into the telescopic cylinder 5. As the air is continuously compressed, the air pressure inside the telescopic cylinder 5 increases, and the downward pressure of the piston cylinder 6 and the pressing plate 7 on the office chair also increases, thereby detecting the pressure limit of the office chair.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An office chair endurance testing device, comprising a testing platform (1) and a limit frame (2), a servo motor (3) and a plurality of clamping rods (4) mounted on the top of the testing platform (1), a telescopic cylinder (5) being fixedly arranged on the top of the testing platform (1) by a supporting rod, characterized in that: The bottom of the telescopic cylinder (5) is sleeved with a piston cylinder (6) that moves up and down, the bottom of the piston cylinder (6) is fixedly provided with a pressing plate (7), and the inner wall of the telescopic cylinder (5) is fixedly provided with a limiting rod (8) that passes through the top of the piston cylinder (6) to limit its position; The side of the piston cylinder (6) is connected to a compression assembly which compresses air through the cooperation of positive and negative lead screws; The compression assembly comprises a positive thread lever (9), a center block (10), a negative thread lever (11), a screw ring (12), an outer compression cylinder (13), an inner compression cylinder (14), a connecting pipe (15), a check box (16) and a hose (17); a positive thread lever (9) is fixedly arranged on the power output end at the top of the servo motor (3); a center block (10) and a negative thread lever (11) fixed at the top of the positive thread lever (9) are fixed at the top; the outer peripheries of the negative thread lever (11) and the positive thread lever (9) are both threaded sleeves. A lead screw ring (12) is connected, and an outer compression cylinder (13) and an inner compression cylinder (14) for compressed air moving in opposite directions are sleeved and fixed on the outer periphery of the two lead screw rings (12). Connecting pipes (15) are embedded on both sides of the outer compression cylinder (13). A check box (16) with a check function is provided at the end of the connecting pipe (15). A hose (17) connected to the telescopic cylinder (5) is provided at the end of the check box (16). Piston rings (18) are sleeved on the surfaces of the inner compression cylinder (14) and the piston cylinder (6).

2. The office chair endurance detection device according to claim 1, characterized in that: The check box (16) comprises a bevel gear rod (161), a tilting rod (162), a clamping plate (163), a movable rod (164), a check plate (165), a rubber ring (166), a check rod (167), a limit plate (168), a check block (169) and a lift plate (1610). The inner wall of the check box (16) is fixed with a bevel gear rod (161) and a tilting rod (162) that are kept parallel. The inner wall of the check box (16) is fixed with two clamping plates (163). The two clamping plates (163) have hollow openings. A movable rod (164) is provided for rotational movement, a check plate (165) covering the inner wall of the check box (16) is fixed at the end of the movable rod (164), a rubber ring (166) is provided on one side of the check plate (165), a check rod (167) is hingedly connected to the other side of the check plate (165) via a hinge, two limit plates (168) for clamping the helical gear rod (161) are fixed at the end of the check rod (167), and a check block (169) and a lift plate (1610) are fixedly provided between the two limit plates (168).

3. The office chair endurance detection device according to claim 2, characterized in that: A plurality of latching teeth (1611) are provided at the lower left of the check block (169), and the lift plate (1610) is tilted and located at the upper left of the check block (169), and the position of the lift plate (1610) and the position of the latching teeth (1611) are symmetrical with respect to the center of the check block (169).

4. The office chair endurance detection device according to claim 3, characterized in that: The check block (169) is located at the center of the check block (169), and a plurality of slots are provided on the top of the bevel gear rod (161). The locking teeth (1611) of the check block (169) are locked in the slots of the bevel gear rod (161).

5. The office chair endurance detection device according to claim 2, characterized in that: The two sides of the check box (16) are respectively provided with pin holes symmetrically located with each other, a hose (17) and three connecting pipes (15) are respectively connected to the pin holes of the two check boxes (16), and the rubber ring (166) is tightly attached to the ends of the hose (17) and the connecting pipe (15).

6. The office chair endurance testing device according to claim 4, characterized in that: The slot of the helical gear rod (161) is in the shape of a right triangle. The check rod (167) is higher on the left and lower on the right to maintain an inclination. The check plate (165) is movable. After the check plate (165) is vertically downward, the rubber ring (166) is tightly attached to the pipe mouth of the connecting pipe (15).

7. The office chair endurance testing device according to claim 2, characterized in that: The helical gear rod (161) is higher on the left and lower on the right, maintaining an inclination of 30°, and the inclination rod (162) is higher on the left and lower on the right, maintaining an inclination of 30°.

8. The office chair endurance testing device according to claim 1, characterized in that: The clamping rods (4) are respectively located on the front and back sides of the connecting tube (15), the interiors of the two check boxes (16) remain open from right to left, and the two check boxes (16) are symmetrically arranged on both sides of the outer compression cylinder (13).

9. The office chair endurance testing device according to claim 1, characterized in that: The outer compression cylinder (13) is sleeved on the outer periphery of the inner compression cylinder (14); the overlapping length of the outer compression cylinder (13) and the inner compression cylinder (14) is inversely proportional to the size of the space formed inside them; and the piston ring (18) surrounds the inner wall of the outer compression cylinder (13).

10. The office chair endurance testing device according to claim 1, characterized in that: A pressure sensor and a wireless transceiver are arranged on the top of the inner wall of the telescopic cylinder (5); the length of the limit rod (8) is greater than the length of the piston cylinder (6); the positive thread lever (9), the center block (10) and the negative thread lever (11) are stacked and fixed in sequence from bottom to top.

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