Double-side hub fixing structure for folding wheelchair

Abstract

The invention is applicable to the technical field of folding wheelchairs, and provides a double-side hub fixing structure for a folding wheelchair, which comprises a wheelchair body, a first fixing plate and a second fixing plate are fixedly connected to the wheelchair body, a second fixing groove is formed in the rear side of the first fixing plate, and a first groove is formed in the front side of the second fixing plate. The front side of the first fixing plate and the front side of the second fixing plate are both fixedly connected with protective blocks, power grooves are formed in the first fixing plate and the second fixing plate, and moving grooves communicating with the interiors of the power grooves are formed in the top of the first fixing plate. The first clamping plate and the second clamping plate can more stably fix the hub, and meanwhile, the first rack extends into the hub, so that the first rack can block a supporting strip of a tire, and the hub is more stably fixed.

Description

Technical Field

[0001] The present invention relates to the technical field of folding wheelchairs, and more particularly to a double-sided wheel hub fixing structure for a folding wheelchair. Background Art

[0002] Wheelchairs are important means of transportation for the wounded, sick and disabled for home rehabilitation, turnover transportation, medical treatment and outdoor activities. Wheelchairs not only meet the transportation needs of the physically disabled and people with limited mobility, but more importantly, they facilitate family members to move and care for patients, allowing patients to use wheelchairs for physical exercise and participation in social activities. Wheelchairs are divided into electric and manual folding wheelchairs.

[0003] At present, the main folding form of foldable wheelchairs is to flip them over to reduce the overall size of the wheelchair for easy carrying or to enable it to be loaded into the trunk of a car. However, this is more suitable for wheelchairs with small wheels. People who go out are more willing to carry wheelchairs with large wheels, which have a strong ability to overcome obstacles. However, after the large wheelchair is folded, the wheel hub of the wheelchair is movable, so when the user moves the wheelchair, the rotation of the wheel hub is likely to affect the movement of the wheelchair, making it difficult for the user to grab the wheelchair. For this reason, the present application further improves the existing wheelchairs to improve portability. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a double-sided wheel hub fixing structure for a foldable wheelchair.

[0005] To achieve the above object, the present invention provides the following technical solutions: A double-sided wheel hub fixing structure for a folding wheelchair comprises a wheelchair body, wherein a first fixing plate and a second fixing plate are fixedly connected to the wheelchair body, a second fixing groove is provided on the rear side of the first fixing plate, a first groove is provided on the front side of the second fixing plate, a protective block is fixedly connected to the front sides of the first fixing plate and the second fixing plate, a power groove is provided inside the first fixing plate and the second fixing plate, a movable groove connected to the inside of the power groove is provided on the top of the first fixing plate, a transmission frame extending to the outside of the first fixing plate is slidably connected inside the movable groove, a first clamping plate is fixedly connected to a side of the transmission frame away from the first fixing plate, a first rack is slidably connected inside the power groove to extend to the outside of the first fixing plate, a second rack is fixedly connected to the bottom of the transmission frame, a gear is rotatably connected inside the power groove, a second clamping plate is fixedly connected to the top of the first rack, the second clamping plate is arranged outside the first fixing plate, grooves are provided on adjacent sides of the first clamping plate and the second clamping plate, friction layers are provided inside the grooves of the first clamping plate and the second clamping plate, a protective positioning device is provided on the front side of the first fixing plate, and a connecting and fixing device is provided on the front side of the first fixing plate.

[0006] The present invention is further configured such that: the gear is disposed between the second rack and the first rack, and tooth teeth are provided on one side of the second rack and the first rack close to the gear, and the second rack and the first rack are meshed and connected to the surface of the gear through the tooth teeth.

[0007] The present invention is further configured such that: one side of the second rack is fixedly connected with a first spring, and one end of the first spring away from the second rack is fixedly connected with the inner wall of the power groove.

[0008] The present invention is further configured such that: a limiting shaft is fixedly connected inside the moving groove, and the surface of the limiting shaft is slidably connected to the inside of the transmission frame.

[0009] The present invention is further configured such that: an installation groove is formed at the top of the transmission frame, an installation plate is slidably connected inside the installation groove, the installation plate is fixed inside the installation groove by bolts, a mudguard is fixedly connected to one side of the installation plate, and a scraper is fixedly connected to the bottom of the mudguard.

[0010] The present invention is further configured such that: the protection and positioning device includes a protection block, one side of the protection block close to the first fixing plate is fixedly connected to the surface of the first fixing plate, a cross groove is formed on the side of the protection block away from the first fixing plate, the cross section of the cross groove is cross-shaped, a rotating column is fixedly connected to one side of the gear, and one end of the rotating column away from the gear rotates through the inside of the first fixing plate and extends into the inside of the cross groove, a square groove is formed inside the rotating column, a square rod is slidably connected inside the square groove, a second handle is fixedly connected to one side of the square rod located in the cross groove, and the surface of the second handle is slidably connected to the inside of the cross groove.

[0011] The present invention is further configured such that: a tension spring is fixedly connected to one side of the square rod away from the second handle, and one end of the tension spring away from the square rod is fixedly connected to the inner wall of the square groove.

[0012] The present invention is further configured such that: the connection and fixing device includes an extension block, one side of the extension block close to the first fixing plate is fixedly connected to the surface of the first fixing plate, a transmission groove communicating with the inside of the second fixing groove is formed inside the first fixing plate, a square frame is slidably connected inside the transmission groove, the cross section of the square frame is in a C shape, the square frame is composed of a transverse rod and two longitudinal rods, inclined surfaces are provided on the right sides of the two longitudinal rods of the square frame, two symmetrical connection grooves are formed inside the first groove, and one side of the square frame close to the connection groove is inserted into the inside of the connection groove.

[0013] The present invention is further configured such that: a pull groove communicating with the inside of the transmission groove is formed inside the extension block, a T-shaped frame fixedly connected to the square frame is slidably connected inside the pull groove, a first handle is fixedly connected to the front side of the T-shaped frame, and a second spring is fixedly connected inside the pull groove, and one end of the second spring close to the T-shaped frame is fixedly connected to the surface of the T-shaped frame.

[0014] The advantages of the present invention are: 1. The present invention provides a double-sided wheel hub fixing structure for a foldable wheelchair. The second handle slides into the interior of the cross groove, so that the first clamping plate and the second clamping plate can fix the wheel hub more stably. At the same time, the first rack extends to the interior of the wheel hub, so that the first rack can block the support bar of the tire, so that the fixation of the wheel hub is more stable, so that the user can carry the folded wheelchair body more smoothly, and to a certain extent reduce the situation that the tire of the wheelchair body rotates when the folded wheelchair body is being carried, making it inconvenient for the user to grab the wheelchair body, thereby allowing the user to use the device more smoothly.

[0015] 2. The present invention provides a double-sided wheel hub fixing structure for a foldable wheelchair. The second spring is reset to allow the square frame to slide into the interior of the connecting groove, thereby fixing the positions of the first fixing plate and the second fixing plate, and fixing the position of the folded wheelchair body, so that the user can carry the folded wheelchair body more stably and use the device more smoothly.

[0016] 3. The present invention provides a double-sided wheel hub fixing structure for a foldable wheelchair. The mud on the tires of the wheelchair body can be covered by a mudguard. A scraper is fixedly connected to the bottom of the mudguard. The scraper can be used to scrape the mud on the tires of the wheelchair body and to a certain extent, the mud on the tires of the wheelchair body can be scraped, so that the user can use the device more smoothly.

[0017] 4. The double-sided wheel hub fixing structure for a foldable wheelchair of the present invention provides a certain degree of protection for the second handle by sliding the second handle into the interior of the cross groove, and reduces direct exposure of the second handle to the external environment to a certain extent, so that objects in the external environment are not easy to collide with the second handle and cause damage to the second handle. At the same time, the position of the second handle is positioned and fixed through the mutual cooperation of the cross groove and the second handle, and the wheel hub of the wheelchair body can be fixed more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a double-side wheel hub fixing structure for a folding wheelchair of the present invention; Figure 2 It is a schematic diagram of the structure of the wheelchair body of the present invention; Figure 3 is a schematic structural diagram of the second fixing plate of the present invention; Figure 4 is a schematic structural diagram of the first rack of the present invention; Figure 5 For the present invention Figure 4 A is a schematic diagram of the enlarged structure of the middle part; Figure 6It is a structural schematic diagram of the first fixing plate of the present invention; Figure 7 It is a structural schematic diagram of the extension block of the present invention.

[0019] In the figure: 1, wheelchair body; 2, first fixing plate; 3, second fixing plate; 4, first groove; 5, second fixing groove; 6, protection block; 7, extension block; 8. Moving slot; 9. Power slot; 10. Gear; 11. Rotating column; 12. First rack; 13. Second rack; 14. Limiting shaft; 15. First spring; 16. Transmission frame; 17. First clamping plate; 18. Second clamping plate; 19. Mounting groove; 20. Mounting plate; 21. Fender; 22. Scraper; 23. Square groove; 24. Square rod; 25. Tension spring; 26. Connecting groove; 27. Square frame; 28. T-shaped frame; 29. ​​Transmission groove; 30. Pull groove; 31. Second spring; 32. First handle; 33. Cross groove; 34. Second handle. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] See also Figure 1-Figure 7The present invention provides the following technical solutions: a double-sided wheel hub fixing structure for a folding wheelchair, comprising a wheelchair body 1, a first fixing plate 2 and a second fixing plate 3 are fixedly connected to the wheelchair body 1, the first fixing plate 2 and the second fixing plate 3 are arranged on the left and right sides of the wheelchair body 1, a second fixing groove 5 is provided on the rear side of the first fixing plate 2, a first groove 4 is provided on the front side of the second fixing plate 3, a protective block 6 is fixedly connected to the front sides of the first fixing plate 2 and the second fixing plate 3, a power groove 9 is provided inside the first fixing plate 2 and the second fixing plate 3, the insides of the two power grooves 9 are provided with the same structure, a moving groove 8 communicating with the inside of the power groove 9 is provided on the top of the first fixing plate 2, a transmission frame 16 extending to the outside of the first fixing plate 2 is slidably connected inside the moving groove 8, and a first clamping plate 17 is fixedly connected to the side of the transmission frame 16 away from the first fixing plate 2, The power groove 9 is internally slidably connected with a first rack 12 extending to the outside of the first fixed plate 2, the bottom of the transmission frame 16 is fixedly connected with a second rack 13, the power groove 9 is internally rotatably connected with a gear 10, the gear 10 is arranged between the second rack 13 and the first rack 12, the top of the first rack 12 is fixedly connected with a second clamping plate 18, the second clamping plate 18 is arranged on the outside of the first fixed plate 2, the first clamping plate 17 and the second clamping plate 18 are both provided with grooves on the adjacent sides, and the grooves of the first clamping plate 17 and the second clamping plate 18 are both provided with friction layers, the first clamping plate 17 and the second clamping plate 18 are close to the wheel hub of the wheelchair body 1 through the first clamping plate 17 and the second clamping plate 18, the first clamping plate 17 and the second clamping plate 18 can position and fix the wheel hub of the wheelchair body 1 through the friction layer, the front side of the first fixed plate 2 is provided with a protective positioning device, and the front side of the first fixed plate 2 is provided with a connecting and fixing device.

[0022] The second rack 13 and the first rack 12 are both provided with teeth on one side close to the gear 10, and the second rack 13 and the first rack 12 are meshed with the surface of the gear 10 through the teeth. A first spring 15 is fixedly connected to one side of the second rack 13, and one end of the first spring 15 away from the second rack 13 is fixedly connected to the inner wall of the power slot 9, and the first spring 15 can be compressed and reset by the movement of the second rack 13.

[0023] A limiting shaft 14 is fixedly connected inside the moving groove 8 , and a surface of the limiting shaft 14 is slidably connected to the inside of the transmission frame 16 , so that the moving direction of the transmission frame 16 is limited by the limiting shaft 14 .

[0024] A mounting groove 19 is provided at the top of the transmission frame 16, and a mounting plate 20 is slidably connected inside the mounting groove 19. The mounting plate 20 is fixed inside the mounting groove 19 by bolts, and a fender 21 is fixedly connected to one side of the mounting plate 20. The mud on the tire of the wheelchair body 1 can be covered by the fender 21, and a scraper 22 is fixedly connected to the bottom of the fender 21. The scraper 22 can be used to scrape the mud on the tire of the wheelchair body 1, and the mud on the tire of the wheelchair body 1 can be scraped to a certain extent, so that the user can use the device more smoothly.

[0025] The protective positioning device includes a protective block 6, and the side of the protective block 6 close to the first fixed plate 2 is fixedly connected to the surface of the first fixed plate 2. A cross groove 33 is provided on the side of the protective block 6 away from the first fixed plate 2, and the cross groove 33 has a cross-shaped cross section. A rotating column 11 is fixedly connected to one side of the gear 10, and the end of the rotating column 11 away from the gear 10 rotates through the interior of the first fixed plate 2 and extends to the interior of the cross groove 33. A square groove 23 is provided inside the rotating column 11, and a square rod 24 is slidably connected to the interior of the square groove 23. The square rod 24 is located on one side of the cross groove 33 and is fixedly connected to a second handle 34, and the surface of the second handle 34 is slidably connected to the interior of the cross groove 33. The square rod 24 is away from the gear 10. A tension spring 25 is fixedly connected to one side of the second handle 34. One end of the tension spring 25 away from the square rod 24 is fixedly connected to the inner wall of the square groove 23. The movement of the square rod 24 can stretch and reset the tension spring 25. The second handle 34 slides into the cross groove 33, so that the second handle 34 is protected to a certain extent and is less exposed to the external environment to a certain extent, so that objects in the external environment are not likely to collide with the second handle 34 and cause damage to the second handle 34. At the same time, the cross groove 33 and the second handle 34 cooperate with each other to position the second handle 34 and fix it, and the wheel hub of the wheelchair body 1 can be fixed more stably.

[0026] The second handle 34 is slid out of the interior of the cross groove 33 by the staff, and the second handle 34 drives the square rod 24 to move, stretching the tension spring 25. At the same time, the second handle 34 is rotated by the staff. The second handle 34 drives the rotating column 11 to rotate through the square rod 24, and the rotating column 11 drives the gear 10 to rotate. The gear 10 drives the first rack 12 and the second rack 13 to move relatively through the teeth, compressing the first spring 15. The first rack 12 and the second rack 13 drive the first clamping plate 17 and the second clamping plate 18 to move away from each other relatively, releasing the fixation of the first clamping plate 17 and the second clamping plate 18 on the wheel hub of the wheelchair body 1, enabling the user to use the device more smoothly. At the same time, when the first spring 15 resets, the first clamping plate 17 and the second clamping plate 18 are close to the wheel hub of the wheelchair body 1, enabling the first clamping plate 17 and the second clamping plate 18 to position and fix the wheel hub. At the same time, when the second handle 34 slides into the interior of the cross groove 33, the first clamping plate 17 and the second clamping plate 18 can fix the wheel hub more stably. At the same time, since the first rack 12 extends into the interior of the wheel hub, the first rack 12 can block the support bars of the tire, making the fixation of the wheel hub more stable, enabling the user to carry the folded wheelchair body 1 more smoothly, and to a certain extent reducing the situation where the tires of the wheelchair body 1 rotate during the handling of the folded wheelchair body 1, making it inconvenient for the user to grasp the wheelchair body 1, so that the user can use the device more smoothly.

[0027] The connection and fixation device includes an extension block 7. One side of the extension block 7 close to the first fixing plate 2 is fixedly connected to the surface of the first fixing plate 2. The extension block 7 is arranged on the right side of the protection block 6. A transmission groove 29 communicating with the interior of the second fixing groove 5 is opened in the interior of the first fixing plate 2. A square frame 27 is slidably connected in the interior of the transmission groove 29. The cross section of the square frame 27 is in a C shape. The square frame 27 is composed of a transverse rod and two longitudinal rods. Slopes are arranged on the right sides of the two longitudinal rods of the square frame 27. Two symmetric connection grooves 26 are opened in the interior of the first groove 4. One side of the square frame 27 close to the connection groove 26 is inserted into the interior of the connection groove 26. The square frame 27 can slide out of and into the interior of the connection groove 26, and the position fixation between the first fixing plate 2 and the second fixing plate 3 can be released and fixed.

[0028] A drawing groove 30 connected to the transmission groove 29 is provided inside the extension block 7, a T-shaped frame 28 fixedly connected to the square frame 27 is slidably connected inside the drawing groove 30, a first handle 32 is fixedly connected to the front side of the T-shaped frame 28, a second spring 31 is fixedly connected inside the drawing groove 30, one end of the second spring 31 close to the T-shaped frame 28 is fixedly connected to the surface of the T-shaped frame 28, the second spring 31 can be compressed and reset by the movement of the T-shaped frame 28, the front side of the T-shaped frame 28 is fixedly connected to the first handle 32, and the T-shaped frame 28 can be pulled more smoothly by the first handle 32.

[0029] After the wheelchair body 1 is folded by the staff, the second fixing plate 3 is tightly attached to each other through the first groove 4 and the second fixing groove 5. At the same time, through the inclined surface of the square frame 27, the second fixing plate 3 can push the square frame 27 to move when the second fixing plate 3 moves close to the first fixing plate 2, so that the square frame 27 slides into the transmission groove 29 and compresses the second spring 31. When the second fixing plate 3 and the first fixing plate 2 cooperate, the second spring 31 resets the square frame 27 to slide into the connecting groove 26, and the positions of the first fixing plate 2 and the second fixing plate 3 are fixed, and the folded position of the wheelchair body 1 is fixed, so that the user can carry the folded wheelchair body 1 more stably and use the device more smoothly.

[0030] Working principle: A double-sided wheel hub fixing structure for a folding wheelchair. When in use, the staff makes the second handle 34 slide out of the cross slot 33, and the second handle 34 drives the square rod 24 to move, so that the tension spring 25 is stretched. At the same time, the staff rotates the second handle 34, and the second handle 34 drives the rotating column 11 to rotate through the square rod 24, so that the rotating column 11 drives the gear 10 to rotate, and the gear 10 drives the first rack 12 and the second rack 13 to move relative to each other through the teeth, so that the first spring 15 is compressed, and the first splint 17 and the second splint 18 are driven to move relatively away from each other through the first rack 12 and the second rack 13, so that the first splint 1 The wheel hub of the wheelchair body 1 is released by the first spring 15, so that the user can use the device more smoothly. At the same time, the first spring 15 is reset to make the first clamping plate 17 and the second clamping plate 18 close to the wheel hub of the wheelchair body 1, so that the first clamping plate 17 and the second clamping plate 18 can position and fix the wheel hub. At the same time, the second handle 34 slides into the inside of the cross groove 33, so that the first clamping plate 17 and the second clamping plate 18 can fix the wheel hub more stably. At the same time, the first rack 12 extends to the inside of the wheel hub, so that the first rack 12 can block the support bar of the tire, so that the fixation of the wheel hub is more stable, so that the user can carry the folded wheelchair body 1 more smoothly. After the wheelchair body 1 is folded by the staff, the second fixing plate 3 is tightly attached to each other through the first groove 4 and the second fixing groove 5. At the same time, through the inclined surface of the square frame 27, the second fixing plate 3 can push the square frame 27 to move when the second fixing plate 3 moves close to the first fixing plate 2, so that the square frame 27 slides into the transmission groove 29 and compresses the second spring 31. When the second fixing plate 3 and the first fixing plate 2 cooperate, the second spring 31 is reset to make the square frame 27 slide into the connecting groove 26, and the positions of the first fixing plate 2 and the second fixing plate 3 are fixed, and the folded position of the wheelchair body 1 is fixed, so that the user can carry the folded wheelchair body 1 more stably.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-sided wheel hub fixing structure for a foldable wheelchair, comprising a wheelchair body (1), characterized in that: The wheelchair body (1) is fixedly connected to a first fixing plate (2) and a second fixing plate (3); a second fixing groove (5) is provided on the rear side of the first fixing plate (2); a first groove (4) is provided on the front side of the second fixing plate (3); a protective block (6) is fixedly connected to the front sides of the first fixing plate (2) and the second fixing plate (3); a power groove (9) is provided inside the first fixing plate (2) and the second fixing plate (3); a moving groove (8) communicating with the inside of the power groove (9) is provided on the top of the first fixing plate (2); a transmission frame (16) extending to the outside of the first fixing plate (2) is slidably connected inside the moving groove (8); a side of the transmission frame (16) away from the first fixing plate (2) is fixedly connected to the first fixing plate (2); A clamping plate (17), the power groove (9) is slidably connected to a first rack (12) extending to the outside of the first fixed plate (2), the bottom of the transmission frame (16) is fixedly connected to a second rack (13), the power groove (9) is rotatably connected to a gear (10), the top of the first rack (12) is fixedly connected to a second clamping plate (18), the second clamping plate (18) is arranged on the outside of the first fixed plate (2), the adjacent sides of the first clamping plate (17) and the second clamping plate (18) are both provided with grooves, the grooves of the first clamping plate (17) and the second clamping plate (18) are both provided with friction layers, the front side of the first fixed plate (2) is provided with a protective positioning device, and the front side of the first fixed plate (2) is provided with a connecting and fixing device.

2. The double-side wheel hub fixing structure for a folding wheelchair according to claim 1, characterized in that: The gear (10) is arranged between the second rack (13) and the first rack (12); the second rack (13) and the first rack (12) are both provided with teeth on a side close to the gear (10); the second rack (13) and the first rack (12) are meshedly connected with the surface of the gear (10) via the teeth.

3. The double-side wheel hub fixing structure for a folding wheelchair according to claim 2, characterized in that: A first spring (15) is fixedly connected to one side of the second rack (13); an end of the first spring (15) away from the second rack (13) is fixedly connected to the inner wall of the power slot (9).

4. The double-side wheel hub fixing structure for a foldable wheelchair according to claim 3, characterized in that: The interior of the movable groove (8) is fixedly connected to a limit shaft (14), and the surface of the limit shaft (14) is slidably connected to the interior of the transmission frame (16).

5. The double-side wheel hub fixing structure for a foldable wheelchair according to claim 1, characterized in that: The top of the transmission frame (16) is provided with a mounting groove (19), the interior of the mounting groove (19) is slidably connected to a mounting plate (20), the mounting plate (20) is fixed to the interior of the mounting groove (19) by bolts, a fender (21) is fixedly connected to one side of the mounting plate (20), and a scraper (22) is fixedly connected to the bottom of the fender (21).

6. The double-side wheel hub fixing structure for a foldable wheelchair according to claim 1, characterized in that: The described protection and positioning device includes a protection block (6). One side of the protection block (6) close to the first fixing plate (2) is fixedly connected to the surface of the first fixing plate (2). A cross groove (33) is formed on the side of the protection block (6) away from the first fixing plate (2). The cross section of the cross groove (33) is cross-shaped. One side of a gear (10) is fixedly connected to a rotating column (11). The end of the rotating column (11) away from the gear (10) rotatably penetrates the inside of the first fixing plate (2) and extends into the inside of the cross groove (33). A square groove (23) is formed inside the rotating column (11). A square rod (24) is slidably connected inside the square groove (23). One side of the square rod (24) located in the cross groove (33) is fixedly connected to a second handle (34). The surface of the second handle (34) is slidably connected to the inside of the cross groove (33).

7. The double-side wheel hub fixing structure for a foldable wheelchair according to claim 6, characterized in that: One side of the square rod (24) away from the second handle (34) is fixedly connected to a tension spring (25). One end of the tension spring (25) away from the square rod (24) is fixedly connected to the inner wall of the square groove (23).

8. The double-side wheel hub fixing structure for a foldable wheelchair according to claim 1, characterized in that: The described connection and fixing device includes an extension block (7). One side of the extension block (7) close to the first fixing plate (2) is fixedly connected to the surface of the first fixing plate (2). A transmission groove (29) communicating with the inside of the second fixing groove (5) is formed inside the first fixing plate (2). A square frame (27) is slidably connected inside the transmission groove (29). The cross section of the square frame (27) is in the shape of a reversed C, and the square frame (27) is composed of a transverse rod and two longitudinal rods. Bevels are provided on the right sides of the two longitudinal rods of the square frame (27). Two symmetrical connection grooves (26) are formed inside the first groove (4). One side of the square frame (27) close to the connection grooves (26) is inserted into the inside of the connection grooves (26).

9. The double-side wheel hub fixing structure for a foldable wheelchair according to claim 8, characterized in that: A pull groove (30) communicating with the inside of the transmission groove (29) is formed inside the extension block (7). A T-shaped frame (28) fixedly connected to the square frame (27) is slidably connected inside the pull groove (30). A first handle (32) is fixedly connected to the front side of the T-shaped frame (28). A second spring (31) is fixedly connected inside the pull groove (30). One end of the second spring (31) close to the T-shaped frame (28) is fixedly connected to the surface of the T-shaped frame (28).

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