scooter

Abstract

The utility model discloses a scooter, including frame, guide wheel, two groups of drive components, two drive wheels, the left side of frame is equipped with handle, and the left side of frame is located to guide wheel, and guide wheel is connected with handle transmission, and two groups of drive components are located respectively in the right side of frame's front side and rear side, and two drive wheels are connected with two groups of drive components transmission respectively. The utility model has the advantages of riding stable, convenient control speed, save physical energy, simple structure.

Description

Technical Field

[0001] This utility model relates to the field of scooters, and in particular to a scooter. Background Technology

[0002] Currently, a patent with authorization announcement number "CN2714415Y" discloses a self-propelled scooter. When in use, the feet are covered by leather sleeves, and when the heel is pressed down on the pedals, this power is transmitted through a sway gear and a gear to an overrunning clutch, and then from the clutch to a large gear, causing the large gear to rotate counterclockwise, thus initiating gliding motion. When the heel is lifted, the pedals return to their original position under the action of a torsion spring, and the large gear cannot rotate clockwise relative to the overrunning clutch at a large angle. The self-propelled scooter can also be used for gliding in the same way as rollerblading or skateboarding.

[0003] However, since the torsion spring is located at the foot pedal, the rebound force of the torsion spring is inevitably large. Moreover, the rotation point of the foot pedal is at the foot pedal. Therefore, when stepping down, it requires a great deal of force to rotate the pendulum gear, thus greatly consuming the operator's physical strength. Utility Model Content

[0004] The purpose of this invention is to provide a scooter that has the advantages of stable riding, easy speed control, energy saving, and simple structure.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A scooter includes a frame, a guide wheel, two sets of drive components, and two drive wheels. The frame has a handlebar on the left side, the guide wheel is located on the left side of the frame and is connected to the handlebar. The two sets of drive components are located on the front and rear sides of the right side of the frame, respectively, and the two drive wheels are connected to the two sets of drive components.

[0007] The two sets of drive components are placed mirror-symmetrically along the transverse central axis of the vehicle frame;

[0008] The rear drive assembly includes a bracket, a drive gear, a driven gear, a drive sprocket, a driven sprocket, a chain, a pedal, a footrest, a shock absorber spring, and a connecting rod. The bracket is fixedly connected to the frame. The drive gear is rotatably connected to the front of the bracket, and the driven gear is rotatably connected to the right side of the front of the bracket. The drive gear and driven gear mesh. The drive wheel is rotatably connected to the rear of the bracket. The driven sprocket is fixedly connected to the shaft of the drive wheel. The drive sprocket is located directly behind the driven gear. The chain meshes with the drive sprocket and driven sprocket. A flywheel is provided between the driven gear and the drive sprocket. The pedal is horizontally located above the bracket. The right side of the pedal is rotatably connected to the top of the bracket. The left side of the connecting rod is rotatably connected to the right side of the front of the pedal. The right side of the connecting rod is rotatably connected to the right side of the front of the drive gear. The footrest is rotatably connected to the left side of the top of the pedal. The right side of the shock absorber spring is rotatably connected to the top of the bracket, and the left side of the shock absorber spring is rotatably connected to the right side of the bottom of the pedal.

[0009] The preferred option is as follows:

[0010] Preferably, the frame includes a front assembly, a first frame pole, a second frame pole, a vertical pole, and a seat. The first frame pole and the second frame pole are arranged horizontally front to back. The front assembly is located on the left side of the first frame pole and the second frame pole. A plurality of reinforcing rods are provided between the first frame pole and the second frame pole. The vertical pole is located on top of the reinforcing rod on the right side. The seat is fixedly located on top of the vertical pole.

[0011] The first and second support poles are placed symmetrically in mirror image along the transverse central axis between them;

[0012] The first support pole includes a first round pole placed horizontally. The left end of the first round pole has a first bend to the upper left front side, the right end of the first support pole has a second bend to the upper right, and then a third bend to the right side. The left side of the support located at the rear side is fixedly connected to the right side of the first support pole.

[0013] The first and second support poles are fixedly equipped with head tubes on their left sides;

[0014] A pad is fixedly provided at the middle position of the top of the first frame pole and the second frame pole.

[0015] Preferably, the support for the drive assembly located on the rear side includes a first crossbar, a first mounting plate, and a second mounting plate. The first mounting plate is fixedly located on the top right side of the first crossbar, and the second mounting plate is fixedly located on the top right side of the first crossbar and the right side of the first mounting plate. The top of the second mounting plate is tilted to the right.

[0016] The drive wheel is rotatably connected to the right side of the first crossbar, the drive gear is rotatably connected to the lower end of the first mounting plate, the flywheel is inserted into the right end of the second mounting plate, and the right side of the pedal is rotatably connected to the top of the first mounting plate.

[0017] Preferably, the vertical cross-sections of both the first mounting plate and the second mounting plate are acute-angled triangles.

[0018] Preferably, the vertical cross-section of the pedal is V-shaped, the included angle of the V-shape of the pedal is obtuse, the right side of the pedal is arc-shaped, and the front and rear sides of the right side of the pedal are both fixedly provided with first fixing plates. The upper end of the first mounting plate is located between the two first fixing plates. The right side of the front side of the first fixing plate is provided with a first circular through hole that penetrates the first fixing plate and the first mounting plate. A first pin is inserted into the first circular through hole.

[0019] The top left side of the pedal is fixed with a second fixing plate on the front and rear sides. The top of each second fixing plate is arc-shaped. The pedal is square. The bottom of the pedal is fixed with a rotating block. The rotating block is located between the two second fixing plates. The front side of the second fixing plate is provided with a second circular through hole that passes through the rotating block and the second fixing plate. A second pin is inserted into the second circular through hole.

[0020] Preferably, the drive gear is fan-shaped, and the central angle of the fan-shaped drive gear is 120°.

[0021] Preferably, a reinforcing block is fixedly provided at the bottom right side of the pedal, a third circular through hole is provided on the front side of the reinforcing block, a fourth circular through hole is provided on the left side of the front side of the connecting rod, and a third pin is inserted into the third and fourth circular through holes.

[0022] A fifth circular through hole is provided on the right side of the front part of the connecting rod, and a sixth circular through hole is provided on the right side of the front part of the drive gear. A fourth pin is inserted into the fifth and sixth circular through holes.

[0023] Preferably, buffer pads are fixedly provided at the positions of the second fixing plates of the first frame pole, the second frame pole and their corresponding foot poles.

[0024] Preferably, a third fixing plate is fixedly provided on the front and rear sides of the bottom right side of the pedal, and a fourth fixing plate is fixedly provided on the front and rear sides at the left angle between the first crossbar and the first mounting plate;

[0025] The front side of the third fixing plate has a seventh circular through hole, and the front side of the fourth fixing plate has an eighth circular through hole. The joint bearing at one end of the shock-absorbing spring is located between the third fixing plates, and the joint bearing at the other end of the shock-absorbing spring is located between the fourth fixing plates. The seventh circular through hole of the third fixing plate and its corresponding joint bearing are provided with a fifth pin, and the eighth circular through hole of the fourth fixing plate and its corresponding joint bearing are provided with a sixth pin.

[0026] In summary, this utility model has the following beneficial effects:

[0027] 1. By setting up the bracket, the positions of the drive gear, driven gear, drive sprocket, driven sprocket, pedal, shock-absorbing spring, and connecting rod can be reasonably distributed, reducing the force required by the operator to step on the pedal and saving the operator's physical strength;

[0028] 2. By configuring the drive gear, driven gear, drive sprocket, driven sprocket, chain, pedal, and connecting rod, the force applied by the pedal to the drive gear through the connecting rod can be transferred to the driven gear. Subsequently, the driven gear transfers the force to the drive sprocket, and then the drive sprocket transfers the force to the driven sprocket through the chain. Finally, the driven sprocket drives the drive wheel to rotate.

[0029] 3. The frame design allows for a low bottom, stabilizing the vehicle and preventing falls. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structural design of the embodiment;

[0031] Figure 2 This is a schematic diagram of the overall structural design of the vehicle frame in the embodiment.

[0032] Figure 3 This is a schematic diagram of the overall structural design of the rear drive component in the embodiment;

[0033] Figure 4 This is a bottom side view of the overall structural design of the rear drive component in the embodiment.

[0034] Figure 5 This is an exploded view of the rear drive assembly of the embodiment.

[0035] In the diagram, 1. Frame; 2. Guide wheel; 3. Drive assembly; 4. Drive wheel;

[0036] 111. Handlebar; 112. Head assembly; 113. First support pole; 114. Second support pole; 115. Upright pole; 116. Seat; 117. Reinforcing bar; 118. First round bar; 119. First bend; 120. Second bend; 121. Third bend; 122. Head tube; 123. Pad; 124. Buffer pad;

[0037] 311. Bracket; 312. Drive gear; 313. Driven gear; 314. Drive sprocket; 315. Driven sprocket; 316. Chain; 317. Bumper rod; 318. Pedal; 319. Shock-absorbing spring; 320. Connecting rod; 321. Flywheel; 322. First crossbar; 323. First mounting plate; 324. Second mounting plate; 325. First fixing plate; 326. First pin; 327. Second fixing plate; 328. Rotating block; 329. Second pin; 330. Reinforcing block; 331. Third pin; 332. Fourth pin; 333. Third fixing plate; 334. Fourth fixing plate; 335. Fifth pin; 336. Sixth pin. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to the accompanying drawings.

[0039] Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings.

[0040] Scooters, such as Figures 1-5 As shown, the vehicle includes a frame 1, a guide wheel 2, two sets of drive components 3, and two drive wheels 4. The left side of the frame 1 is provided with a handlebar 111. The guide wheel 2 is located on the left side of the frame 1 and is connected to the handlebar 111. The two sets of drive components 3 are located on the front and rear sides of the right side of the frame 1, respectively. The two drive wheels 4 are connected to the two sets of drive components 3, respectively.

[0041] The frame 1 includes a front assembly 112, a first frame rod 113, a second frame rod 114, a vertical pole 115, and a seat 116. The first frame rod 113 and the second frame rod 114 are arranged horizontally front to back. The front assembly 112 is located to the left of the first frame rod 113 and the second frame rod 114. Several reinforcing rods 117 are provided between the first frame rod 113 and the second frame rod 114. The vertical pole 115 is located on top of the reinforcing rod 117 on the right side. The seat 116 is fixedly located on top of the vertical pole 115.

[0042] The first support pole 113 and the second support pole 114 are placed symmetrically in mirror image along the transverse central axis between them;

[0043] The first support pole 113 includes a first round pole 118 placed horizontally. The left end of the first round pole 118 has a first bend 119 on the front side of the upper left. The right end of the first support pole 113 has a second bend 120 on the upper right and then a third bend 121 on the right side. The left side of the support 311 located on the rear side is fixedly connected to the right side of the first support pole 113.

[0044] The head tube 122 is fixedly provided on the left side of the first frame rod 113 and the second frame rod 114; the head assembly 112 includes a head upright and a front fork. The head upright is inserted into the head tube 122, the front fork is fixed at the bottom of the head upright, the guide wheel 2 is located between the front forks, the handlebar 111 is located at the top of the head upright, and the handlebar 111 is provided with a brake lever 111. The head assembly 112 is prior art and will not be described in detail here.

[0045] A pad 123 is fixedly provided at the top midpoint of the first support pole 113 and the second support pole 114. The pad 123 is used for operators to place items and their feet.

[0046] The two sets of drive components 3 are placed symmetrically in mirror image along the transverse central axis of the frame 1;

[0047] Specifically, the drive component 3 located at the rear is described.

[0048] The drive assembly 3 located at the rear includes a bracket 311, a drive gear 312, a driven gear 313, a drive sprocket 314, a driven sprocket 315, a chain 316, a pedal 317, a pedal 318, a shock-absorbing spring 319, and a connecting rod 320. The bracket 311 is fixedly connected to the frame 1. The drive gear 312 is rotatably connected to the front side of the bracket 311, and the driven gear 313 is rotatably connected to the right side of the front side of the bracket 311. The drive gear 312 and the driven gear 313 mesh. The drive wheel 4 is rotatably connected to the rear side of the bracket 311. The driven sprocket 315 is fixedly connected to the shaft of the drive wheel 4. The drive sprocket 314 is located on the front side of the driven gear 313. At the rear, chain 316 meshes with drive sprocket 314 and driven sprocket 315. A flywheel 321 is provided between driven gear 313 and drive sprocket 314. Pedal lever 317 is laterally located above bracket 311. The right side of pedal lever 317 is rotatably connected to the top of bracket 311. The left side of connecting rod 320 is rotatably connected to the right side of front of pedal lever 317. The right side of connecting rod 320 is rotatably connected to the right side of front of drive gear 312. Pedal 318 is rotatably connected to the left side of top of pedal lever 317. The right side of shock absorber spring 319 is rotatably connected to top of bracket 311. The left side of shock absorber spring 319 is rotatably connected to the right side of bottom of pedal lever 317.

[0049] The drive gear 312 is fan-shaped, and the central angle of the fan is 120°. This reduces the weight of the drive gear 312.

[0050] The bracket 311 of the drive assembly 3 located on the rear side includes a first crossbar 322, a first mounting plate 323, and a second mounting plate 324. The first mounting plate 323 is fixedly located on the top right side of the first crossbar 322, and the second mounting plate 324 is fixedly located on the top right side of the first crossbar 322 and the right side of the first mounting plate 323. The top of the second mounting plate 324 is tilted to the right.

[0051] The drive wheel 4 is rotatably connected to the right side of the first crossbar 322, the drive gear 312 is rotatably connected to the lower end of the first mounting plate 323, the flywheel 321 is inserted into the right end of the second mounting plate 324, and the right side of the pedal 317 is rotatably connected to the top of the first mounting plate 323.

[0052] The vertical cross-sections of the first mounting plate 323 and the second mounting plate 324 are both acute-angled triangles.

[0053] The vertical cross-section of the pedal 317 is V-shaped, and the included angle of the V-shape of the pedal 317 is obtuse. The right side of the pedal 317 is arc-shaped. The front and rear sides of the right side of the pedal 317 are both fixed with a first fixing plate 325. The upper end of the first mounting plate 323 is located between the two first fixing plates 325. The right side of the front side of the first fixing plate 325 has a first circular through hole that passes through the first fixing plate 325 and the first mounting plate 323. A first pin 326 is inserted into the first circular through hole.

[0054] The top left side of the pedal 317 is fixed with a second fixing plate 327 on the front and rear sides. The top of each second fixing plate 327 is arc-shaped. The pedal 318 is square plate-shaped. The bottom of the pedal 318 is fixed with a rotating block 328. The rotating block 328 is located between the two second fixing plates 327. The front side of the second fixing plate 327 is provided with a second circular through hole that passes through the rotating block 328 and the second fixing plate 327. A second pin 329 is inserted into the second circular through hole.

[0055] A reinforcing block 330 is fixedly provided at the bottom right side of the pedal 317. A third circular through hole is provided on the front side of the reinforcing block 330. A fourth circular through hole is provided on the left side of the front side of the connecting rod 320. A third pin 331 is inserted into the third circular through hole and the fourth circular through hole.

[0056] A fifth circular through hole is provided on the right side of the front part of the connecting rod 320, and a sixth circular through hole is provided on the right side of the front part of the drive gear 312. A fourth pin 332 is inserted into the fifth and sixth circular through holes.

[0057] A buffer pad 124 is fixedly provided at the position of the second fixing plate 327 corresponding to the position of the first support pole 113, the second support pole 114 and the corresponding foot pole 317.

[0058] A third fixing plate 333 is fixedly provided on the front and rear sides of the bottom right side of the foot bar 317, and a fourth fixing plate 334 is fixedly provided on the front and rear sides of the angle between the first crossbar 322 and the left side of the first mounting plate 323.

[0059] The front side of the third fixing plate 333 has a seventh circular through hole, and the front side of the fourth fixing plate 334 has an eighth circular through hole. The joint bearing at one end of the shock-absorbing spring 319 is located between the third fixing plates 333, and the joint bearing at the other end of the shock-absorbing spring 319 is located between the fourth fixing plates 334. The seventh circular through hole of the third fixing plate 333 and its corresponding joint bearing have a fifth pin 335. The eighth circular through hole of the fourth fixing plate 334 and its corresponding joint bearing have a sixth pin 336. The upper end of the shock-absorbing spring 319 is tilted to the left.

[0060] Specific implementation process:

[0061] Step 1: The vehicle is in its initial state. At this time, both shock absorber springs 319 are in an uncompressed state, and the left sides of both pedals 317 are tilted upwards.

[0062] Step 2: The operator sits on seat 116 with both feet placed on the two pedals 318 respectively;

[0063] Step 3: The operator presses down on both pedals 318 in turn, starting with the right foot pressing down on the rear pedal 318.

[0064] Step 4: At this time, the front end of the pedal 317 rotates downward along the first pin 326, the shock-absorbing spring 319 is compressed and rotates along the fifth pin 335 and the sixth pin 336, the connecting rod 320 rotates along the third pin 331 and the fourth pin 332, and pushes the drive gear 312 to rotate clockwise at the connection between its center and the first mounting plate 323. The drive gear 312 drives the driven gear 313 to rotate counterclockwise. The driven gear 313 drives the drive sprocket 314 to rotate counterclockwise through the flywheel 321. The drive sprocket 314 drives the driven sprocket 315 to rotate counterclockwise through the chain 316. The driven sprocket 315 drives the drive wheel 4 to rotate.

[0065] Step 5: Then the operator's left foot presses down on the front pedal 318, repeating step 4;

[0066] The two drive wheels 4 propelled the scooter to the left;

[0067] At the same time, lift your right foot upward;

[0068] Step Six: At this time, the shock-absorbing spring 319 rebounds, pushing the left side of the pedal 317 to rotate upward along the first pin 326. The connecting rod 320 rotates along the third pin 331 and the fourth pin 332, and pulls the drive gear 312 to rotate counterclockwise at the connection between its center and the first crossbar 322. The drive gear 312 drives the driven gear 313 to rotate clockwise. The driven gear 313 does not drive the drive sprocket 314 to rotate through the flywheel 321.

[0069] Step 7: Step down with your right foot, and repeat step 4;

[0070] Lift your left foot and repeat step six;

[0071] This cycle repeats continuously, moving the scooter.

[0072] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A scooter, characterized in that: The vehicle includes a frame (1), a guide wheel (2), two sets of drive components (3), and two drive wheels (4). The frame (1) has a handlebar (111) on its left side. The guide wheel (2) is located on the left side of the frame (1) and is connected to the handlebar (111) in a transmission. The two sets of drive components (3) are located on the front and rear sides of the right side of the frame (1), respectively. The two drive wheels (4) are connected to the two sets of drive components (3) in a transmission. The two sets of drive components (3) are placed mirror-symmetrically along the transverse central axis of the frame (1); The drive assembly (3) located at the rear includes a bracket (311), a drive gear (312), a driven gear (313), a drive sprocket (314), a driven sprocket (315), a chain (316), a pedal (317), a pedal (318), a shock-absorbing spring (319), and a connecting rod (320). The bracket (311) is fixedly connected to the frame (1). The drive gear (312) is rotatably connected to the front side of the bracket (311). The driven gear (313) is rotatably connected to the right side of the front side of the bracket (311). The drive gear (312) meshes with the driven gear (313). The drive wheel (4) is rotatably connected to the rear side of the bracket (311). The driven sprocket (315) is fixedly connected to the shaft of the drive wheel (4). The drive sprocket (314) is located at the position of the driven gear (313). Directly behind the support (311), the chain (316) meshes with the drive sprocket (314) and the driven sprocket (315). A flywheel (321) is provided between the driven gear (313) and the drive sprocket (314). The pedal (317) is located horizontally above the support (311). The right side of the pedal (317) is rotatably connected to the top of the support (311). The left side of the connecting rod (320) is rotatably connected to the right side of the front side of the pedal (317). The right side of the connecting rod (320) is rotatably connected to the right side of the front side of the drive gear (312). The pedal (318) is rotatably connected to the left side of the top of the pedal (317). The right side of the shock-absorbing spring (319) is rotatably connected to the top of the support (311). The left side of the shock-absorbing spring (319) is rotatably connected to the right side of the bottom of the pedal (317).

2. The scooter according to claim 1, characterized in that: The frame (1) includes a front assembly (112), a first frame rod (113), a second frame rod (114), a vertical pole (115), and a seat (116). The first frame rod (113) and the second frame rod (114) are placed horizontally front to back. The front assembly (112) is located to the left of the first frame rod (113) and the second frame rod (114). A plurality of reinforcing rods (117) are provided between the first frame rod (113) and the second frame rod (114). The vertical pole (115) is located on top of the reinforcing rod (117) on the right side. The seat (116) is fixedly located on top of the vertical pole (115). The first support pole (113) and the second support pole (114) are placed in a mirror-symmetrical manner along the transverse central axis between them; The first support pole (113) includes a first round pole (118) placed horizontally. The left end of the first round pole (118) has a first bend (119) on the upper left side. The right end of the first support pole (113) has a second bend (120) on the upper right side, and then a third bend (121) on the right side. The left side of the bracket (311) located on the rear side is fixedly connected to the right side of the first support pole (113). The first support pole (113) and the second support pole (114) are fixedly provided with head tubes (122) on their left sides. A pad (123) is fixedly provided at the top midpoint of the first support pole (113) and the second support pole (114).

3. The scooter according to claim 2, characterized in that: The bracket (311) of the drive assembly (3) located on the rear side includes a first crossbar (322), a first mounting plate (323), and a second mounting plate (324). The first mounting plate (323) is fixedly located on the top right side of the first crossbar (322), and the second mounting plate (324) is fixedly located on the top right side of the first crossbar (322) and the right side of the first mounting plate (323). The top of the second mounting plate (324) is tilted to the right. The drive wheel (4) is rotatably connected to the right side of the first crossbar (322), the drive gear (312) is rotatably connected to the lower end of the first mounting plate (323), the flywheel (321) is inserted into the right end of the second mounting plate (324), and the right side of the pedal (317) is rotatably connected to the top of the first mounting plate (323).

4. The scooter according to claim 3, characterized in that: The vertical cross-sections of the first mounting plate (323) and the second mounting plate (324) are both acute-angled triangles.

5. The scooter according to claim 4, characterized in that: The vertical cross section of the pedal (317) is "V" shaped, the included angle of the "V" shape of the pedal (317) is obtuse, the right side of the pedal (317) is arc-shaped, and the front and rear sides of the right side of the pedal (317) are both fixed with a first fixing plate (325). The upper end of the first mounting plate (323) is located between the two first fixing plates (325). The right side of the front side of the first fixing plate (325) is provided with a first circular through hole that passes through the first fixing plate (325) and the first mounting plate (323). A first pin (326) is inserted into the first circular through hole. The top left side of the pedal (317) is fixed with a second fixing plate (327) on the front and rear sides. The top of each second fixing plate (327) is arc-shaped. The pedal (318) is square plate-shaped. The bottom of the pedal (318) is fixed with a rotating block (328). The rotating block (328) is located between the two second fixing plates (327). The front side of the second fixing plate (327) is provided with a second circular through hole that passes through the rotating block (328) and the second fixing plate (327). A second pin (329) is inserted into the second circular through hole.

6. The scooter according to claim 5, characterized in that: The drive gear (312) is fan-shaped, and the central angle of the fan-shaped drive gear (312) is 120°.

7. The scooter according to claim 6, characterized in that: A reinforcing block (330) is fixedly provided at the bottom right side of the pedal (317). A third circular through hole is provided on the front side of the reinforcing block (330). A fourth circular through hole is provided on the left side of the front side of the connecting rod (320). A third pin (331) is inserted into the third circular through hole and the fourth circular through hole. A fifth circular through hole is provided on the right side of the front part of the connecting rod (320), and a sixth circular through hole is provided on the right side of the front part of the drive gear (312). A fourth pin (332) is inserted into the fifth and sixth circular through holes.

8. The scooter according to claim 7, characterized in that: The first support pole (113), the second support pole (114) and their corresponding foot pole (317) are fixed with buffer pads (124) at the positions corresponding to the second fixing plate (327).

9. The scooter according to claim 8, characterized in that: A third fixing plate (333) is fixedly provided on the front and rear sides of the bottom right side of the foot bar (317), and a fourth fixing plate (334) is fixedly provided on the front and rear sides of the angle between the first cross bar (322) and the left side of the first mounting plate (323). The front side of the third fixing plate (333) is provided with a seventh circular through hole, and the front side of the fourth fixing plate (334) is provided with an eighth circular through hole. The joint bearing at one end of the shock-absorbing spring (319) is located between the third fixing plates (333), and the joint bearing at the other end of the shock-absorbing spring (319) is located between the fourth fixing plates (334). The seventh circular through hole of the third fixing plate (333) and its corresponding joint bearing are provided with a fifth pin (335), and the eighth circular through hole of the fourth fixing plate (334) and its corresponding joint bearing are provided with a sixth pin (336).

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