A wheelchair drop strength performance testing machine

Abstract

The present invention relates to the technical field of wheelchair drop test, and particularly relates to a wheelchair drop strength performance testing machine, which includes a base. On the upper sides of the left and right sides of the base, a gantry is fixedly connected together. A wheelchair is placed inside the gantry. On the upper side of the gantry, a lifting mechanism is provided for lifting the wheelchair. Under the lifting mechanism, a connecting mechanism is provided for quickly installing the handrail and side support frame of the wheelchair onto the lifting mechanism. The lifting mechanism, connecting mechanism and counterweight mechanism adopted in the present invention are used in cooperation to be able to complete the wheelchair drop performance test under different load conditions. In the test preparation stage, the connection between the wheelchair and the lifting mechanism is rapid, which can effectively improve the connection work efficiency between the wheelchair and the lifting mechanism. At the same time, the angle of the wheelchair can be electrically controlled to ensure that all four wheels land simultaneously, effectively ensuring the accuracy of the evaluation of the overall impact resistance performance of the wheelchair, and also effectively shortening the adjustment time for the four-wheel landing positioning.

Description

Technical Field

[0001] The present invention relates to the technical field of wheelchair drop tests, and particularly relates to a wheelchair drop strength performance testing machine. Background Art

[0002] A wheelchair is an auxiliary mobile device mainly used to help people with limited mobility move freely in different environments. When a wheelchair leaves the factory, it needs to undergo performance tests. The drop test is the most common test for wheelchairs. The wheelchair drop test is an important step to ensure the safety and durability of a wheelchair when it encounters accidental drops or impacts. Such tests aim to simulate extreme situations that may be encountered during actual use to verify the strength of the wheelchair structure, the reliability of key components, and the effectiveness of the safety restraint system.

[0003] A wheelchair drop testing machine is a device specifically designed to test the durability and safety of a wheelchair when it encounters accidental drops or impacts. Such testing machines are usually used to simulate various situations that a wheelchair may encounter during actual use to ensure that they meet relevant safety standards and regulations.

[0004] Existing wheelchair drop testing machines mostly connect the wheelchair to the testing machine through iron chains or cloth strips. On the one hand, the method of connecting with iron chains or cloth strips requires manual bundling, which takes a long time. On the other hand, to ensure the overall evaluation effect of the wheelchair drop test, it is required that all four wheels of the wheelchair touch the ground simultaneously. With the method of connecting with iron chains or cloth strips, the bundling position needs to be continuously adjusted, and the adjustment takes a long time, making it more troublesome to use. At the same time, when conducting a weighted drop test on the wheelchair, a test dummy needs to be tied to the wheelchair. On the one hand, the cost of using the test dummy is relatively high. On the other hand, tying the test dummy also takes a lot of time. Summary of the Invention

[0005] Technical problems to be solved: A wheelchair drop strength performance testing machine provided by the present invention can solve the above-mentioned problems.

[0006] Technical solution: To achieve the above purpose, the present invention adopts the following technical solution. A wheelchair drop strength performance testing machine includes a base. On the upper sides of the left and right sides of the base, a gantry is fixedly connected. A wheelchair is placed inside the gantry. On the upper side of the gantry, a lifting mechanism for lifting the wheelchair is provided. Below the lifting mechanism, a connecting mechanism for quickly installing the armrest and side support frame of the wheelchair onto the lifting mechanism is provided. Between the seat cushion of the wheelchair and the connecting mechanism, a weighting mechanism for weighting the wheelchair is provided.

[0007] The lifting mechanism includes a lifting plate movably arranged on the lower side of the bottom wall of the gantry.

[0008] The connecting mechanism includes an L-shaped frame movably arranged on the lower side of the lifting plate. The horizontal section of the L-shaped frame points to the armrest of the wheelchair and a first telescopic arm is slidably connected inside it. The vertical section of the L-shaped frame points to the base and a second telescopic arm is slidably connected inside it. The first telescopic arm and the second telescopic arm do not extend beyond the L-shaped frame when telescoping. Anti-support components are arranged on both the first telescopic arm and the second telescopic arm. The anti-support component on the first telescopic arm is used to lock the armrest of the wheelchair, and the anti-support component on the second telescopic arm is used to lock the side support frame of the wheelchair. An adjustment component for height adjustment and connection of the two anti-support components is arranged on the lifting plate.

[0009] The counterweight mechanism includes anti-tightening electric push rods symmetrically and fixedly connected to the left and right sides of the L-shaped frame. The output ends of the anti-tightening electric push rods on both sides are fixedly connected downward together with a placement box. The interior of the placement box is hollow and placement openings are provided in the upper parts of the four vertical surfaces. A placement groove is arranged inside the placement box, and a number of arc-shaped limiting grooves are equidistantly arranged in the placement groove. A circular counterweight plate is placed in the arc-shaped limiting grooves. A lock plate component for locking the counterweight plate is arranged on the left and right sides of the placement box together.

[0010] As a preferred technical solution of the present invention, the lifting mechanism further includes a hydraulic cylinder fixedly connected to the center of the top wall of the gantry. The output end of the hydraulic cylinder penetrates downward through the top wall of the gantry and is fixedly connected to an electromagnetic disk. A magnet sheet is fixedly connected to the upper side of the lifting plate corresponding to the position of the electromagnetic disk. A number of guide rods are slidably connected to both the left and right ends of the lifting plate. A number of guide rods on the same end of the lifting plate are fixedly connected between the top wall of the gantry and the support plate. The support plate is fixedly connected to the side wall of the gantry.

[0011] As a preferred technical solution of the present invention, a number of spring fives are arranged between the lifting plate and the support plate, and the spring fives are sleeved on the guide rods one by one corresponding to each other.

[0012] As a preferred technical solution of the present invention, the adjustment component includes two brackets respectively and symmetrically fixedly connected to the front and rear side edges of the lifting plate. The four brackets correspond to the positions of the two armrests of the wheelchair and the left and right side support frames respectively. The ends of the brackets are symmetrically fixedly connected with support plates. A rope winding wheel is rotatably connected between the two support plates of the same bracket through a rotating pin. The rotating pins of the two rope winding wheels on the same side edge of the lifting plate are integrally and fixedly connected to a coupling shaft. One end of the coupling shaft is fixedly connected to a motor, and the motor is fixedly connected to a support plate. A pulling rope is wound on the rope winding wheel.

[0013] As a preferred technical solution of the present invention, the supporting component includes a bidirectional electric push rod that is distributed in the left-right direction and is respectively rotatably connected to the first telescopic arm and the second telescopic arm. Both output ends of the bidirectional electric push rod are provided with boxes. The inside of the box is hollow. A second telescopic plate slidably penetrates through one side surface of the box away from the bidirectional electric push rod. The outer end of the second telescopic plate is fixedly connected with a first supporting plate. The outside of the first supporting plate is provided with a clamping component for cooperating with it to clamp the handrail or side support frame of the wheelchair. The inside of the box is provided with an adjusting component for changing the installation method of the output end of the bidirectional electric push rod and the box.

[0014] As a preferred technical solution of the present invention, the clamping component includes a first telescopic plate slidably penetrating through one side surface of the box away from the bidirectional electric push rod. The outer end of the first telescopic plate is fixedly connected with a second supporting plate. A rack is fixedly connected to a section of the first telescopic plate located inside the box. A first gear is meshed with the rack. The first gear is rotatably connected between the two side walls of the box through a rotating pin. A second rack is also meshed with the periphery of the first gear. The second rack and the first rack are symmetrically distributed about the central axis of the rotating pin. Limited convex strips are integrally and fixedly connected to the two side surfaces of the second rack close to the box. Limited sliding grooves are provided on the two inner walls of the box close to the second rack corresponding to the limited convex strips. The limited convex strips are slidably connected in the limited sliding grooves. A first spring is fixedly connected between the inner wall of the box away from the bidirectional electric push rod and the second rack. The end of the second rack away from the second supporting plate is in contact with the output end of the bidirectional electric push rod.

[0015] As a preferred technical solution of the present invention, the adjusting component includes a first triangular block fixedly connected to the inner end of the second telescopic plate. A second spring is arranged between the first triangular block and the inner wall of the box away from the bidirectional electric push rod. The second spring is sleeved on the second telescopic plate. A first sliding rod is fixedly connected to the inner wall of the box away from the first rack. A connecting plate is slidably connected to the first sliding rod. A limiting plate is fixedly connected to one end of the first sliding rod close to the second telescopic plate. A third spring is sleeved on a section of the first sliding rod between the limiting plate and the connecting plate. A second triangular block is fixedly connected to one end of the connecting plate close to the first triangular block. Both the first triangular block and the second triangular block are right-angled triangular bodies and their inclined surfaces are in sliding contact. A U-shaped hoop facing the output end of the bidirectional electric push rod is integrally and fixedly connected to one end of the connecting plate away from the first triangular block. The output end of the bidirectional electric push rod penetrates through the side wall of the box and extends into the box. The U-shaped hoop is sleeved on a section of the output end of the bidirectional electric push rod located inside the box. An annular groove is provided at the position of the output end of the bidirectional electric push rod corresponding to the U-shaped hoop. An arc-shaped frame is fixedly connected to the inner wall of the arc section of the U-shaped hoop. The arc-shaped frame is slidably matched with the annular groove.

[0016] As a preferred technical solution of the present invention, a connecting ring is fixedly connected to the outside of the second supporting plate. The ends of the pull ropes are respectively tied to the connecting rings. The lifting heights of the two pull ropes on the same coupling for the left and right ends of the corresponding supporting component are the same.

[0017] As a preferred technical solution of the present invention, the lock plate assembly includes rotating rods respectively rotatably connected to the lower parts of the left and right sides of the placement box through mounting blocks. A plurality of bent arms are fixedly connected to the rotating rods. The upper ends of the plurality of bent arms are commonly fixedly connected to a resisting rod. A second gear is fixedly connected to the center of the rotating rod. A third rack is meshed and connected to the side of the second gear away from the placement box. The height of the lower end of the third rack is lower than the bottom height of the placement box. The upper end of the third rack is fixedly connected to a movable plate through a short plate. The movable plate is slidably connected to a plurality of second sliding rods. The upper ends of the plurality of second sliding rods are commonly fixedly connected to a fixing plate. The fixing plate is fixedly connected to the side of the placement box. A limiting block is fixedly connected to the lower end of the second sliding rod. A fourth spring is sleeved on a section of the second sliding rod between the movable plate and the fixing plate.

[0018] As a preferred technical solution of the present invention, an elastic block is fixedly connected to the lower end of the third rack.

[0019] Beneficial effects:

[0020] 1. The connection mechanism adopted by the present invention can utilize the armrest and side support frame structures of the wheelchair, and quickly connect the lifting mechanism with the armrest and side support frame of the wheelchair in an electrically controlled manner. It can effectively reduce the installation and disassembly time of the wheelchair and the testing machine, and can quickly position the four wheels of the wheelchair on the ground through the adjusting components to ensure the balance of the force when the wheelchair falls.

[0021] 2. The counterweight mechanism adopted by the present invention is an integral structure with the connection mechanism. After the connection structure is connected to the wheelchair, the overall counterweight mechanism also forms an integral with the wheelchair, and no additional connection work is required, which is time-saving and labor-saving. At the same time, the added counterweight is also the load of the wheelchair. The method of distributing the counterweight on the wheelchair seat cushion is more in line with the actual center of gravity distribution, further ensuring the accuracy of the test.

[0022] 3. The lifting mechanism, connection mechanism and counterweight mechanism adopted by the present invention are used in cooperation to complete the wheelchair drop performance test under different load conditions. In the test preparation stage, the wheelchair is quickly connected to the lifting mechanism, which can effectively improve the connection work efficiency between the wheelchair and the lifting mechanism. At the same time, the angle of the wheelchair can be electrically controlled to ensure that the four wheels land synchronously, effectively ensuring the accuracy of the evaluation of the overall impact resistance performance of the wheelchair, and can also effectively shorten the adjustment time for the four wheels to land and be positioned. Further, the counterweight and the wheelchair can form an integral structure, which can not only save the use cost of the test dummy, but also ensure the stable installation of the counterweight and is more convenient to use. Description of the drawings

[0023] The present invention will be further described below with reference to the drawings and embodiments.

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0025] Figure 2 is the front view structure schematic diagram of the present invention.

[0026] Figure 3 is the three-dimensional sectional structure schematic diagram of the present invention excluding the wheelchair.

[0027] Figure 4 is the three-dimensional connection structure schematic diagram of the lifting mechanism and the adjustment component of the present invention.

[0028] Figure 5 is the three-dimensional connection structure schematic diagram of the counterweight mechanism and the connection structure of the present invention.

[0029] Figure 6 is the present invention Figure 5 the enlarged structure schematic diagram of area A in.

[0030] Figure 7 is the sectional connection structure schematic diagram inside the box body of the present invention.

[0031] Figure 8 is the half-sectional structure schematic diagram of the output end of the two-way electric push rod and the U-shaped hoop of the present invention.

[0032] Figure 9 is the schematic diagram of the wheelchair style in the specific test of the present invention.

[0033] In the figure: 1, base; 2, gantry; 3, connection mechanism; 31, adjustment component; 311, rope winding wheel; 312, bracket; 313, coupling; 314, support plate; 315, motor; 316, pulling rope; 32, L-shaped frame; 33, telescopic arm one; 34, telescopic arm two; 35, supporting component; 351, two-way electric push rod; 3511, annular groove; 352, box body; 353, first abutting plate; 3531, second telescopic plate; 354, clamping component; 3541, second abutting plate; 3542, first telescopic plate; 3543, limiting convex strip; 3544, first rack; 3545, limiting sliding groove; 3546, first spring; 3547, second rack; 3548, first gear; 355, adjusting component; 3551, second spring; 3552, first triangular block; 3553, second triangular block; 3554, first sliding rod; 3555, connecting plate; 3556, third spring; 3557, U-shaped hoop; 3558, arc-shaped frame; 4, counterweight mechanism; 41, placement box; 411, arc-shaped limiting groove; 42, abutting electric push rod; 43, counterweight plate; 44, lock plate assembly; 441, abutting rod; 442, fixing plate; 443, second sliding rod; 444, fourth spring; 445, movable plate; 446, rotating rod; 447, bent arm; 448, second gear; 449, third rack; 5, lifting mechanism; 51, hydraulic cylinder; 52, magnet sheet; 53, guide rod; 54, lifting plate; 55, fifth spring; 56, support plate; 57, electromagnetic disk. Detailed Embodiments

[0034] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways defined and covered by the claims.

[0035] Refer to Figure 1 and Figure 9 A wheelchair drop strength performance testing machine, including a base 1, a gantry 2 is fixedly connected to the upper sides of the left and right sides of the base 1. A wheelchair is placed inside the gantry 2. A lifting mechanism 5 for lifting the wheelchair is arranged on the upper side of the gantry 2. A connecting mechanism 3 for quickly installing the handrail and side support frame of the wheelchair onto the lifting mechanism 5 is arranged under the lifting mechanism 5. A counterweight mechanism 4 for counterweighting the wheelchair is arranged between the seat cushion of the wheelchair and the connecting mechanism 3.

[0036] Refer to Figure 1 and Figure 2 The lifting mechanism 5 includes a lifting plate 54 movably arranged under the bottom wall of the gantry 2.

[0037] Refer to Figure 1 and Figure 3 The connecting mechanism 3 includes an L-shaped frame 32 movably arranged under the lifting plate 54. The horizontal section of the L-shaped frame 32 points to the handrail of the wheelchair and a first telescopic arm 33 is slidably connected inside it. The vertical section of the L-shaped frame 32 points to the base 1 and a second telescopic arm 34 is slidably connected inside it. The first telescopic arm 33 and the second telescopic arm 34 do not extend beyond the L-shaped frame 32 when telescoping. Support components 35 are arranged on both the first telescopic arm 33 and the second telescopic arm 34. The support component 35 on the first telescopic arm 33 is used to lock the handrail of the wheelchair, and the support component 35 on the second telescopic arm 34 is used to lock the side support frame of the wheelchair. An adjustment component 31 for adjusting the height and connecting the two groups of support components 35 is arranged on the lifting plate 54.

[0038] Refer to Figure 1 、 Figure 3 、 Figure 5 and Figure 6 The counterweight mechanism 4 includes abutting electric push rods 42 symmetrically and fixedly connected to the left and right sides of the L-shaped frame 32. The output ends of the two abutting electric push rods 42 are fixedly connected downward together with a placement box 41. The interior of the placement box 41 is hollow and placement openings are provided in the upper parts of the four vertical surfaces. A placement groove is arranged inside the placement box 41. A number of arc-shaped limiting grooves 411 are equidistantly arranged in the placement groove. Circular counterweight plates 43 are placed in the arc-shaped limiting grooves 411. A lock plate assembly 44 for locking the counterweight plates 43 is arranged on the left and right sides of the placement box 41 together.

[0039] During specific operation, the placement box 41 is controlled to contact the seat cushion of the wheelchair by pressing against the electric push rod 42 to ensure stable placement of the placement box 41. The load of the wheelchair is adjusted by adding or reducing the counterweight plate 43, thereby completing the drop test of the wheelchair under different load conditions.

[0040] Refer to Figure 1 、 Figure 2 and Figure 4 The lifting mechanism 5 further includes a hydraulic cylinder 51 fixedly connected to the center of the top wall of the gantry 2. The output end of the hydraulic cylinder 51 penetrates downward through the top wall of the gantry 2 and is fixedly connected with an electromagnet disk 57. A magnet sheet 52 is fixedly connected to the upper side of the lifting plate 54 corresponding to the position of the electromagnet disk 57. A plurality of guide rods 53 are slidably connected to both the left and right ends of the lifting plate 54. A plurality of guide rods 53 on the same end of the lifting plate 54 are fixedly connected between the top wall of the gantry 2 and the support plate 56. The support plate 56 is fixedly connected to the side wall of the gantry 2. A plurality of spring fives 55 are arranged between the lifting plate 54 and the support plate 56, and the spring fives 55 are sleeved on the guide rods 53 one by one.

[0041] During specific operation, the electromagnet disk 57 is controlled to approach the magnet sheet 52 by the hydraulic cylinder 51. The electromagnet disk 57 is energized to generate magnetic force to adsorb the magnet sheet 52. Then, the hydraulic cylinder 51 is used to control the adsorbed electromagnet disk 57 and magnet sheet 52 to drive the lifting plate 54 to rise. The wheelchair is indirectly driven by the lifting plate 54 to rise to the drop height. Then, the electromagnet disk 57 is powered off, and the electromagnet disk 57 and the magnet sheet 52 are separated. The lifting plate 54 and the wheelchair freely fall, thereby completing the wheelchair drop process. The spring fives 55 buffer the descent of the lifting plate 54.

[0042] Refer to Figure 1 and Figure 3 The adjustment assembly 31 includes two brackets 312 respectively and symmetrically fixedly connected to the front and rear side edges of the lifting plate 54. The four brackets 312 respectively correspond to the positions of the two handrails of the wheelchair and the side braces on the left and right sides. The ends of the brackets 312 are symmetrically fixedly connected with support plates 314. A rope winding wheel 311 is rotatably connected between the two support plates 314 of the same bracket 312 through a rotating pin. The rotating pins of the two rope winding wheels 311 on the same side of the lifting plate 54 are integrally and commonly fixedly connected to the coupling 313. One end of the coupling 313 is fixedly connected with a motor 315. The motor 315 is fixedly connected to one support plate 314. A pulling rope 316 is wound on the rope winding wheel 311.

[0043] During specific operation, the motor 315 is used to control the rotation of the coupling 313. The coupling 313 drives the rotation of two rope winding wheels 311. The two rope winding wheels 311 wind the pulling rope 316 to adjust the height of the supporting assembly 35. The adjustment of the two side supporting assemblies 35 is asynchronous. When the wheelchair is lifted, if the ground clearance of the front and rear moving wheels of the wheelchair is different, the height of the unilateral supporting assembly 35 is adjusted to make the ground clearance of the front and rear moving wheels the same, ensuring that when the wheelchair falls, the four wheels can touch the ground, thereby ensuring the even stress during the wheelchair fall and ensuring the accurate evaluation of the impact resistance performance of the entire system.

[0044] Refer to Figure 3 and Figure 7 As shown in FIGS. and, the supporting assembly 35 includes a bidirectional electric push rod 351 that is distributed in the left-right direction and is respectively rotatably connected to the telescopic arm one 33 and the telescopic arm two 34. Box bodies 352 are installed at both output ends of the bidirectional electric push rod 351. The interior of the box body 352 is hollow. A telescopic plate two 3531 slidably penetrates through one side surface of the box body 352 away from the bidirectional electric push rod 351. A first abutting plate 353 is fixedly connected to the outer end of the telescopic plate two 3531. A clamping component 354 for clamping the handrail or side support frame of the wheelchair in cooperation with the first abutting plate 353 is arranged outside the first abutting plate 353. An adjusting component 355 for changing the installation method of the output end of the bidirectional electric push rod 351 and the box body 352 is arranged inside the box body 352.

[0045] Refer to Figure 7 As shown in FIGS. and, the clamping component 354 includes a telescopic plate one 3542 that slidably penetrates through one side surface of the box body 352 away from the bidirectional electric push rod 351. A second abutting plate 3541 is fixedly connected to the outer end of the telescopic plate one 3542. A rack is fixedly connected to a section of the telescopic plate one 3542 located inside the box body 352. A gear one 3548 is meshed with the rack. The gear one 3548 is rotatably connected between the two side walls of the box body 352 through a rotating pin. A rack two 3547 is also meshed with the periphery of the gear one 3548. The rack two 3547 and the rack one 3544 are centrosymmetrically distributed about the central axis of the rotating pin. Limited position convex strips 3543 are integrally and fixedly connected to both side surfaces of the rack two 3547 close to the box body 352. Limited position sliding grooves 3545 corresponding to the limited position convex strips 3543 are opened on the inner walls of both sides of the box body 352 close to the rack two 3547. The limited position convex strips 3543 are slidably connected in the limited position sliding grooves 3545. A first spring 3546 is fixedly connected between the inner wall of the box body 352 away from the bidirectional electric push rod 351 and the rack two 3547. One end of the rack two 3547 away from the second abutting plate 3541 is in contact with the output end of the bidirectional electric push rod 351.

[0046] Refer to Figure 7 and Figure 8, the adjusting member 355 includes a first triangular block 3552 fixedly connected to the inner end of the second telescopic plate 3531. A second spring 3551 is provided between the first triangular block 3552 and the inner wall of the box body 352 on the side away from the bidirectional electric push rod 351. The second spring 3551 is sleeved on the second telescopic plate 3531. A first sliding rod 3554 is fixedly connected to the inner wall of the box body 352 on the side away from the first rack 3544. A connecting plate 3555 is slidably connected to the first sliding rod 3554. A limiting plate is fixedly connected to one end of the first sliding rod 3554 close to the second telescopic plate 3531. A third spring 3556 is sleeved on the section of the first sliding rod 3554 between the limiting plate and the connecting plate 3555. A second triangular block 3553 is fixedly connected to one end of the connecting plate 3555 close to the first triangular block 3552. Both the first triangular block 3552 and the second triangular block 3553 are right-angled triangular bodies and their inclined surfaces are in sliding contact with each other. A U-shaped hoop 3557 facing the output end of the bidirectional electric push rod 351 is integrally fixedly connected to one end of the connecting plate 3555 away from the first triangular block 3552. The output end of the bidirectional electric push rod 351 penetrates through the side wall of the box body 352 and extends into the box body 352. The U-shaped hoop 3557 is sleeved on the section of the output end of the bidirectional electric push rod 351 inside the box body 352. An annular groove 3511 is formed in the output end of the bidirectional electric push rod 351 corresponding to the position of the U-shaped hoop 3557. An arc-shaped frame 3558 is fixedly connected to the inner wall of the arc section of the U-shaped hoop 3557. The arc-shaped frame 3558 is in sliding fit with the annular groove 3511.

[0047] During specific operation, locking operations are respectively performed on the two supporting components 35. When using the supporting component 35 at the position of the wheelchair side support frame, first manually pull the supporting component 35 to the positions of the two side support frames of the wheelchair, and then place the two side support frames between the first supporting plate 353 and the second supporting plate 3541 at both ends of the supporting component 35. Then, synchronously extend the output ends on both sides of the bidirectional electric push rod 351. The first supporting plate 353 first contacts the side support frame. Continue to control the bidirectional electric push rod 351 to extend. The first supporting plate 353 will move towards the box body 352. The first supporting plate 353 drives the second telescopic plate 3531 to control the first triangular block 3552 to push the second triangular block 3553 towards the direction of the second rack 3547. The second triangular block 3553 drives the connecting plate 3555 to control the U-shaped hoop 3557 to move towards the direction of the second rack 3547 until the arc-shaped frame 3558 and the annular groove 3511 are separated. The output end of the bidirectional electric push rod 351 will lose the limiting effect of the arc-shaped frame 3558, while the first supporting plate 353 and the box body 352 are in a relatively static state. The output end of the bidirectional electric push rod 351 will continue to extend to push the second rack 3547 to slide along the limiting chute 3545. The cooperation between the second rack 3547 and the first gear 3548 causes the first rack 3544 to move in the direction opposite to the moving direction of the output end of the bidirectional electric push rod 351. In this way, the first rack 3544 drives the first telescopic plate 3542 to drive the second supporting plate 3541 to move towards the box body 352. The relative movement of the first supporting plate 353 and the second supporting plate 3541 locks the wheelchair side support frame. When it is necessary to connect and disassemble the wheelchair side support frame, control the output end of the bidirectional electric push rod 351 to shorten. Under the action of the first spring 3546, the second rack 3547 will drive the first rack 3544 to control the second supporting plate 3541 to move away from the wheelchair side support frame, that is, the relaxation of the wheelchair side support frame can be completed. Continue to be elastically restored by the first spring 3546, the second spring 3551 and the third spring 3556 to control the first supporting plate 353, the second supporting plate 3541 and the U-shaped hoop 3557 to reset. Through the cooperation of the arc-shaped frame 3558 and the annular groove 3511, the output end of the bidirectional electric push rod 351 and the box body 352 are in a locked state. The locking of the wheelchair handrail is the same as above. In this way, the rapid locking and relaxation of the wheelchair handrail and the side support frame are completed. The bidirectional electric push rod 351 with a rotational connection can adjust the appropriate locking angle according to the structures of the wheelchair handrail and the side support frame.

[0048] Refer to Figure 3 and Figure 7 A connecting ring is fixedly connected to the outside of the second supporting plate 3541. The ends of the pull ropes 316 are respectively tied to the connecting rings. The lifting heights of the left and right ends of the corresponding side supporting components 35 by the two pull ropes 316 on the same coupling shaft 313 are the same.

[0049] During specific operation, the draw rope 316 and the connecting ring are pre-connected structures. The position height on the left and right sides of the wheelchair is controlled by the draw rope 316. It is preset that the lifting heights of the left and right ends of the two draw ropes 316 on the same coupling shaft 313 for the corresponding side supporting components 35 are the same, which can save the adjustment work of the wheelchair in the left and right directions.

[0050] Refer to Figure 6 As shown, the lock plate assembly 44 includes rotating rods 446 respectively rotatably connected to the lower parts of the left and right sides of the placement box 41 through mounting blocks. A number of bent arms 447 are fixedly connected to the rotating rods 446. A resisting rod 441 is fixedly connected to the upper ends of the number of bent arms 447 together. A second gear 448 is fixedly connected to the center of the rotating rod 446. A third rack 449 is meshed and connected to the side of the second gear 448 away from the placement box 41. The lower end of the third rack 449 is lower than the bottom height of the placement box 41. The upper end of the third rack 449 is fixedly connected to the movable plate 445 through a short plate. The movable plate 445 is slidably connected to a number of second sliding rods 443. The upper ends of the number of second sliding rods 443 are fixedly connected to a fixing plate 442 together. The fixing plate 442 is fixedly connected to the side of the placement box 41. A limiting block is fixedly connected to the lower end of the second sliding rod 443. A fourth spring 444 is sleeved on the section of the second sliding rod 443 between the movable plate 445 and the fixing plate 442. An elastic block is fixedly connected to the lower end of the third rack 449.

[0051] During specific operation, when the placement box 41 is about to contact the wheelchair seat cushion, the lower end of the third rack 449 contacts the wheelchair seat cushion first. When the placement box 41 continues to move downward, the third rack 449 will move upward to control the rotation of the second gear 448. The rotation of the second gear 448 drives the rotation of the rotating rod 446. The rotation of the rotating rod 446 controls the resisting rod 441 to approach the counterweight plate 43 and press the counterweight plate 43 to ensure the stable placement of the counterweight plate 43, avoid the situation that the wheelchair falls and the counterweight plate 43 detaches from the placement box 41, and improve the use safety. The elastic block is provided. On the one hand, it can reduce the contact damage of the third rack 449 to the wheelchair seat cushion. On the other hand, it can elastically connect and protect the second gear 448 and the third rack 449 after the resisting rod 441 is close to the counterweight plate 43 and the lower end of the third rack 449 is still under the placement box 41. When the counterweight plate 43 needs to be replaced, the placement box 41 is moved away from the wheelchair seat cushion. Under the elastic recovery action of the fourth spring 444, the third rack 449 is controlled to move downward, so as to drive the rotating rod 446 to reverse through the second gear 448 to make the resisting rod 441 away from the counterweight plate 43, thereby completing the automatic locking and loosening of the counterweight plate 43.

[0052] During use: S1: Place the wheelchair inside the gantry 2, and then lock the two supporting components 35 respectively. When using the supporting component 35 at the position of the wheelchair side support frame, manually pull the supporting component 35 to the positions of the two side support frames of the wheelchair, and then place the two side support frames between the first abutting plate 353 and the second abutting plate 3541 at both ends of the supporting component 35. Then, synchronously extend the output ends on both sides of the bidirectional electric push rod 351. The first abutting plate 353 first contacts the side support frame. Continue to control the bidirectional electric push rod 351 to extend. The first abutting plate 353 will move towards the box body 352. The first abutting plate 353 drives the second telescopic plate 3531 to control the first triangular block 3552 to push the second triangular block 3553 towards the second rack 3547. The second triangular block 3553 drives the connecting plate 3555 to control the U-shaped hoop 3557 to move towards the second rack 3547 until the arc-shaped frame 3558 and the annular groove 3511 are separated. The output end of the bidirectional electric push rod 351 will lose the limiting effect of the arc-shaped frame 3558, and the first abutting plate 353 and the box body 352 are in a relatively static state. The output end of the bidirectional electric push rod 351 will continue to extend to push the second rack 3547 to slide along the limiting chute 3545. The cooperation between the second rack 3547 and the first gear 3548 causes the first rack 3544 to move in the direction opposite to the moving direction of the output end of the bidirectional electric push rod 351. In this way, the first rack 3544 drives the first telescopic plate 3542 to drive the second abutting plate 3541 to move towards the box body 352. The relative movement of the first abutting plate 353 and the second abutting plate 3541 locks the wheelchair side support frame. Similarly, the wheelchair armrest is locked.

[0053] S2: Place multiple counterweight plates 43 with the test required load into the arc-shaped limiting groove 411 of the placement box 41. Then, control the placement box 41 to contact the wheelchair seat cushion through the abutting electric push rod 42. When the placement box 41 is about to contact the wheelchair seat cushion, the lower end of the third rack 449 first contacts the wheelchair seat cushion. The placement box 41 continues to move downwards. The third rack 449 will move upwards to control the second gear 448 to rotate. The second gear 448 drives the rotating rod 446 to rotate. The rotation of the rotating rod 446 controls the abutting rod 441 to approach the counterweight plate 43 and press the counterweight plate 43.

[0054] S3: Control the electromagnet disk 57 to approach the magnet sheet 52 through the hydraulic cylinder 51, energize the electromagnet disk 57 to generate magnetic force to adsorb the magnet sheet 52, and then control the adsorbed electromagnet disk 57 and magnet sheet 52 to drive the lifting plate 54 to rise through the hydraulic cylinder 51. Indirectly drive the wheelchair to rise to a certain height by the lifting plate 54, and observe whether the four wheels of the wheelchair are flush. If the ground clearance heights of the front and rear moving wheels of the wheelchair are different, adjust the height of the unilateral support assembly 35 to make the ground clearance heights of the front and rear moving wheels the same. During adjustment, control the coupling 313 to rotate through the motor 315, drive the two rope winding wheels 311 to rotate by the coupling 313, and wind the pull rope 316 by the two rope winding wheels 311 to adjust the height of one side of the support assembly 35 until the four wheels of the wheelchair are flush.

[0055] S4: Lift the wheelchair to the drop height through the lifting assembly, then cut off the power supply of the electromagnet disk 57, the electromagnet disk 57 and the magnet sheet 52 are separated, and the lifting plate 54 and the wheelchair fall freely. Continuously repeat S4 until the specified number of drops is completed, and then judge the performance of the wheelchair after the fall.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wheelchair drop strength performance testing machine, comprising a base (1), wherein the upper sides of the left and right sides of the base (1) are fixedly connected together with a gantry (2), and a wheelchair is placed inside the gantry (2), and is characterized in that: On the upper side of the gantry (2), there is a lifting mechanism (5) for lifting the wheelchair. On the lower side of the lifting mechanism (5), there is a connecting mechanism (3) for quickly installing the handlebar and side support frame of the wheelchair onto the lifting mechanism (5). Between the seat cushion of the wheelchair and the connecting mechanism (3), there is a counterweight mechanism (4) for counterweighting the wheelchair. The lifting mechanism (5) includes a lifting plate (54) movably arranged on the lower side of the bottom wall of the gantry (2). The connecting mechanism (3) includes an L-shaped frame (32) movably arranged on the lower side of the lifting plate (54). A first telescopic arm (33) is slidably connected inside the horizontal section of the L-shaped frame (32), and a second telescopic arm (34) is slidably connected inside the vertical section of the L-shaped frame (32). Support components (35) are arranged on both the first telescopic arm (33) and the second telescopic arm (34). The support component (35) on the first telescopic arm (33) is used to lock the handlebar of the wheelchair, and the support component (35) on the second telescopic arm (34) is used to lock the side support frame of the wheelchair. On the lifting plate (54), there is an adjustment component (31) for adjusting the height and connecting the two support components (35). The counterweight mechanism (4) includes tightening electric push rods (42) symmetrically and fixedly connected to the left and right sides of the L-shaped frame (32). The output ends of the two tightening electric push rods (42) are jointly and fixedly connected downward to a placement box (41). A placement groove is arranged inside the placement box (41), and a number of arc-shaped limiting grooves (411) are equidistantly arranged inside the placement groove. Circular counterweight plates (43) are placed inside the arc-shaped limiting grooves (411). A lock plate component (44) for locking the counterweight plates (43) is jointly arranged on the left and right sides of the placement box (41).

2. The wheelchair drop strength performance testing machine according to claim 1, wherein: The lifting mechanism (5) further includes a hydraulic cylinder (51) fixedly connected to the center of the top wall of the gantry (2). The output end of the hydraulic cylinder (51) penetrates downward through the top wall of the gantry (2) and is fixedly connected to an electromagnetic disk (57). A magnet sheet (52) is fixedly connected to the upper side of the lifting plate (54) corresponding to the position of the electromagnetic disk (57). A number of guide rods (53) are slidably connected to both the left and right ends of the lifting plate (54). A number of guide rods (53) on the same end of the lifting plate (54) are fixedly connected between the top wall of the gantry (2) and a support plate (56), and the support plate (56) is fixedly connected to the side wall of the gantry (2).

3. The wheelchair drop strength performance testing machine according to claim 2, characterized in that: A number of fifth springs (55) are arranged between the lifting plate (54) and the support plate (56), and the fifth springs (55) are sleeved on the guide rods (53) one by one.

4. A wheelchair drop strength performance testing machine according to claim 1, characterized in that: The adjustment component (31) includes two brackets (312) respectively and symmetrically fixed to the front and rear side edges of the lifting plate (54). The four brackets (312) respectively correspond to the positions of the two armrests of the wheelchair and the side braces on the left and right sides. The ends of the brackets (312) are symmetrically and fixedly connected with support plates (314). A rope winding wheel (311) is rotatably connected between the two support plates (314) of the same bracket (312) through a rotating pin. The rotating pins of the two rope winding wheels (311) on the same side edge of the lifting plate (54) are integrally and fixedly connected to the coupling shaft (313). One end of the coupling shaft (313) is fixedly connected with a motor (315), and the motor (315) is fixedly connected to a support plate (314). A pull rope (316) is wound around the rope winding wheel (311).

5. A wheelchair drop strength performance testing machine according to claim 1, characterized in that: The supporting component (35) includes a double-acting electric push rod (351) distributed in the left-right direction and rotatably connected to the first telescopic arm (33) and the second telescopic arm (34) respectively. Box bodies (352) are installed at both output ends of the double-acting electric push rod (351). The interiors of the box bodies (352) are hollow. A second telescopic plate (3531) slidably penetrates through one side surface of the box body (352) far from the double-acting electric push rod (351). The outer end of the second telescopic plate (3531) is fixedly connected with a first abutting plate (353). A clamping component (354) for clamping the armrest or side brace of the wheelchair in cooperation with the first abutting plate (353) is arranged outside the first abutting plate (353). An adjusting component (355) for changing the installation method of the output end of the double-acting electric push rod (351) and the box body (352) is arranged inside the box body (352).

6. The wheelchair drop strength performance testing machine according to claim 5, characterized in that: The clamping component (354) includes a first telescopic plate (3542) slidably penetrating through one side surface of the box body (352) far from the double-acting electric push rod (351). The outer end of the first telescopic plate (3542) is fixedly connected with a second abutting plate (3541). A rack is fixedly connected to a section of the first telescopic plate (3542) located inside the box body (352). A first gear (3548) is meshed with the rack. The first gear (3548) is rotatably connected between the two side walls of the box body (352) through a rotating pin. A second rack (3547) is also meshed with the periphery of the first gear (3548). The second rack (3547) and the first rack (3544) are centrosymmetrically distributed about the central axis of the rotating pin. Limited position convex strips (3543) are integrally and fixedly connected to the two side surfaces of the box body (352) close to the second rack (3547). Limited position sliding grooves (3545) corresponding to the limited position convex strips (3543) are opened on the two inner walls of the box body (352) close to the second rack (3547). The limited position convex strips (3543) are slidably connected in the limited position sliding grooves (3545). A first spring (3546) is fixedly connected between the inner wall of the box body (352) far from the double-acting electric push rod (351) and the second rack (3547). One end of the second rack (3547) far from the second abutting plate (3541) is in contact with the output end of the double-acting electric push rod (351).

7. A wheelchair drop strength performance testing machine according to claim 5, characterized in that: The adjusting member (355) includes a first triangular block (3552) fixedly connected to the inner end of the second telescopic plate (3531). A second spring (3551) is arranged between the first triangular block (3552) and the inner wall of the box body (352) on the side away from the double-acting electric push rod (351). The second spring (3551) is sleeved on the second telescopic plate (3531). A first sliding rod (3554) is fixedly connected to the inner wall of the box body (352) on the side away from the first rack (3544). A connecting plate (3555) is slidably connected to the first sliding rod (3554). A limiting plate is fixedly connected to one end of the first sliding rod (3554) close to the second telescopic plate (3531). A third spring (3556) is sleeved on the section of the first sliding rod (3554) between the limiting plate and the connecting plate (3555). A second triangular block (3553) is fixedly connected to one end of the connecting plate (3555) close to the first triangular block (3552). Both the first triangular block (3552) and the second triangular block (3553) are right-angled triangular bodies, and their inclined surfaces are in sliding contact with each other. A U-shaped hoop (3557) facing the output end of the double-acting electric push rod (351) is integrally and fixedly connected to one end of the connecting plate (3555) away from the first triangular block (3552). The output end of the double-acting electric push rod (351) penetrates through the side wall of the box body (352) and extends into the box body (352). The U-shaped hoop (3557) is sleeved on the section of the output end of the double-acting electric push rod (351) inside the box body (352). An annular groove (3511) is formed in the output end of the double-acting electric push rod (351) corresponding to the position of the U-shaped hoop (3557). An arc-shaped frame (3558) is fixedly connected to the inner wall of the arc section of the U-shaped hoop (3557). The arc-shaped frame (3558) is in sliding fit with the annular groove (3511).

8. A wheelchair drop strength performance testing machine according to claim 6, characterized in that: A connecting ring is fixedly connected to the outer side of the second abutting plate (3541). The ends of the pull ropes (316) are respectively tied to the connecting rings. The lifting heights of the left and right ends of the corresponding side abutting and supporting assemblies (35) by the two pull ropes (316) on the same coupling shaft (313) are the same.

9. The wheelchair drop strength performance testing machine according to claim 1, wherein: The lock plate assembly (44) includes rotating rods (446) respectively rotatably connected to the lower parts of the left and right sides of the placement box (41) through mounting blocks. A plurality of bent arms (447) are fixedly connected to the rotating rods (446). The upper ends of the plurality of bent arms (447) are fixedly connected to a resisting rod (441) together. A second gear (448) is fixedly connected to the center of the rotating rod (446). A third rack (449) is meshed and connected to the side of the second gear (448) away from the placement box (41). The height of the lower end of the third rack (449) is lower than the bottom height of the placement box (41). The upper end of the third rack (449) is fixedly connected to a movable plate (445) through a short plate. The movable plate (445) is slidably connected to a plurality of second sliding rods (443). The upper ends of the plurality of second sliding rods (443) are fixedly connected to a fixing plate (442) together. The fixing plate (442) is fixedly connected to the side surface of the placement box (41). A limiting block is fixedly connected to the lower end of the second sliding rod (443). A fourth spring (444) is sleeved on a section of the second sliding rod (443) between the movable plate (445) and the fixing plate (442).

10. A wheelchair drop strength performance testing machine according to claim 9, characterized in that: An elastic block is fixedly connected to the lower end of the third rack (449).

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