WO2021036021A1

WO2021036021A1 - Pneumatic transmission-based tow truck device

Info

Publication number: WO2021036021A1
Application number: PCT/CN2019/119535
Authority: WO
Inventors: 林丽萍
Original assignee: 青田金程汽车用品有限公司
Priority date: 2019-08-27
Filing date: 2019-11-19
Publication date: 2021-03-04
Also published as: CN110481410A

Abstract

A pneumatic transmission-based tow truck device, comprising a device body (11); the left end of the device body is fixedly connected to a tow truck, and an accident vehicle (19) is located on the right side of the device body; a joint (17) is fixedly connected to the left end of the accident vehicle, and a through groove (18) having an opening facing forward is provided within the joint; a transmission chamber (16) having a opening facing right is provided within the device body, and a pneumatic device (100) is provided within the transmission chamber. The accident vehicle is towed in a manner of pneumatic transmission, the transmission is stable, avoiding secondary damage to the vehicle in the process of towing; and the response of pneumatic transmission is fast, the tow truck can be quickly connected to the accident vehicle, and the accident vehicle can be quickly towed away from a road, avoiding obstruction to traffic.

Description

A trailer device based on pneumatic transmission

Technical field

The invention relates to the field of trailers, in particular to a trailer device based on pneumatic transmission.

Background technique

In modern society, there are more and more cars, and there are more and more traffic accidents and car breakdowns on roads. In order not to hinder traffic, it is necessary to call a trailer to remove the accident vehicle. However, if the existing trailer is not handled properly, it is easy to cause the accident vehicle. Secondary damage. The trailer device based on pneumatic transmission described in the present invention can solve the above-mentioned problems. The present invention uses pneumatic transmission to tow the accident car, which is stable in transmission and avoids secondary damage to the car during the towing process. In addition, the pneumatic transmission responds quickly, can quickly connect the trailer to the accident vehicle, and can quickly drag the accident vehicle off the road to avoid obstructing traffic.

technical problem

Existing trailers are prone to cause secondary damage to the accident vehicle when towing the accident vehicle.

Technical solutions

In order to solve the above problems, this example designs a trailer device based on pneumatic transmission. The trailer device based on pneumatic transmission in this example includes a device body whose left end is fixed to the trailer, and the accident vehicle is located in the device. On the right side of the main body, the left end of the accident vehicle is fixedly connected with a joint, the joint is provided with a through slot that opens forward, the device body is provided with a rightward opening transmission cavity, and the transmission cavity is provided with a pneumatic device An air pump is fixed in the inner wall of the left side of the transmission cavity, and the pneumatic device is connected to the air pump. The air pump can inflate or inhale into the pneumatic device and drive the pneumatic device. The upper and lower ends are engaged with a drag device. The air pump drives the pneumatic device and drives the drag device to connect the pneumatic device with the joint. At this time, the trailer travels and passes through the pneumatic device. The device and the drag device drag the joint and the accident car, a telescopic device is connected between the drag device and the air pump, and the air pump drives the drag device to reset through the telescopic device, In turn, the drag device is separated from the joint. Advantageously, the pneumatic device includes a fixed block fixedly connected to the inner wall of the left side of the transmission cavity, the fixed block is provided with a limiting cavity with a rightward opening, and the inner wall of the limiting cavity is fixedly connected to the left side of the limiting cavity. The fixed pipe is provided with a gas channel extending left and right in the fixed pipe, the leftward penetrating through the fixed block and communicating with the air pump, a guide plate is fixedly connected to the right end of the fixed block, and a guide plate is fixedly connected to the right end of the fixed block. There are guiding grooves penetrating from left and right, a sliding plate is slidably arranged in the guiding groove, the right end of the sliding plate extends out of the transmission cavity and can abut against the joint, and the sliding plate is provided with an opening facing In the left air storage cavity, the right end of the fixed pipe extends into the air storage cavity, and racks are fixed in the upper and lower ends of the sliding plate, and the sliding plate is connected to the drag by the rack engagement The device starts the air pump and sucks air from the air storage cavity through the gas channel, thereby reducing the air pressure in the air storage cavity, and then pushing the sliding plate to slide to the left under the action of atmospheric pressure until The left end of the sliding plate abuts against the left inner wall of the limiting cavity, and at the same time the sliding plate drives the drag device through the rack.

Preferably, a communication groove is symmetrically provided in the inner wall of the left side of the limiting cavity, and a pushing rod is slidably provided in the communication groove, and the right end of the pushing rod extends into the limiting cavity. A sliding groove is provided in the inner wall of the communicating groove on the side away from the center of symmetry. The sliding groove is slidably provided with a resetting slider, the resetting slider is fixedly connected to the pushing rod, and the left end of the resetting slider A return spring is fixedly connected to the inner wall of the left side of the sliding groove, a sealing groove is connected in the inner wall of the left side of the communicating groove, and the sealing groove is connected to the gas channel. A baffle is slidably provided, the baffle can slide into the gas channel and block the gas channel, the sliding plate slides to the left and pushes the push rod to slide to the left, thereby pushing the reset slider Sliding to the left and compressing the return spring, while the pushing rod pushes the baffle plate to slide into the gas channel, thereby reducing the gas flow in the gas channel, thereby reducing the sliding of the sliding plate When the left end of the sliding plate abuts against the inner wall of the left side of the limiting cavity, the baffle blocks the gas passage. When the sliding plate slides to the right and disengages from the push rod, The elastic force of the return spring drives the push rod to slide to the right. At this time, the air pump inflates into the gas channel, and the baffle slides into the sealing groove under the action of air pressure and opens the gas channel , And gradually increase the gas flow rate in the gas channel, thereby increasing the sliding speed of the sliding plate.

Preferably, an air pressure probe is fixed on the inner wall on the right side of the air storage cavity, the air pressure probe is electrically connected to the air pump, and the air pressure probe monitors the air pressure in the air storage cavity in real time.

Beneficially, the drag device includes a restriction groove provided in the guide plate that penetrates up and down and opens to the right, and a spur gear is arranged in the restriction groove to be symmetrical and rotatable up and down, and the spur gear is close to the center of symmetry One end is meshed with the rack, the spur gear is fixedly connected with a torsion shaft, the rear end of the torsion shaft is rotatably connected to the inner wall of the rear side of the restriction groove, and the front side of the spur gear is rotatably provided with a rotating rod , The front end of the torsion shaft is fixedly connected to the rotation rod, the end of the rotation rod away from the center of symmetry can be turned into the through groove and hook the joint, the left end of the rotation rod is hinged to the telescopic device, the The sliding plate slides and drives the spur gear to rotate through the rack, and then drives the rotating rod to rotate through the torsion shaft, so that the rotating rod hooks the joint.

Preferably, a torsion spring is fixedly connected between the rear end of the spur gear and the inner wall of the rear side of the restricting groove. When the rotating rod rotates and hooks the joint, the torsion shaft rotates and twists the The torsion spring in turn makes the torsion spring have elastic force.

Preferably, the inner walls of the upper and lower sides of the transmission cavity are symmetrically provided with spring grooves, and a clamping block is slidably arranged in the spring groove, and one end of the clamping block away from the center of symmetry is one end of the spring groove away from the center of symmetry. A compression spring is fixedly connected between the side inner walls, the rotating rod is provided with a slot with an opening away from the center of symmetry, and the locking block can slide into the slot and clamp the rotating lever.

Advantageously, the telescopic device includes an L-shaped groove symmetrically arranged in the inner wall of the left side of the transmission cavity, the L-shaped groove is connected to the air pump, and a symmetrical and swingable device in the transmission cavity There is a hinged rod, the left end of the hinged rod is fixedly connected with an elastic pipe, the left end of the elastic pipe is fixedly connected to the inner wall of the left side of the transmission cavity, and the elastic pipe is provided with through holes passing through left and right, and the through holes are connected In the L-shaped groove, a vent groove is formed left and right through the hinge rod, the vent groove is connected to the through hole, and a telescopic rod is slidably provided in the vent groove, and the right end of the telescopic rod Hinged to the rotating rod, the air pump inflates the L-shaped groove, and then pushes the telescopic rod to slide through the through hole and the ventilation groove, thereby pushing the rotating rod.

Preferably, the hinge rod is provided with fixed plates symmetrically on both front and rear sides, the left end of the fixed plate is fixedly connected to the inner wall of the left side of the transmission cavity, the front and rear ends of the hinge rod are symmetrical and fixedly connected with a fixed shaft, so One end of the fixed shaft away from the center of symmetry is rotatably connected to the fixed plate.

Beneficial effect

The beneficial effects of the present invention are: the present invention uses pneumatic transmission to drag the accident vehicle, the transmission is stable, the vehicle is prevented from being damaged twice during the drag process, and the response of the pneumatic transmission is fast, and the trailer can be quickly connected to the accident vehicle. It can be connected, and the accident vehicle can be quickly towed off the road to avoid obstructing the traffic.

Description of the drawings

For ease of description, the present invention is described in detail by the following specific embodiments and drawings.

Figure 1 is a schematic diagram of the overall structure of a trailer device based on pneumatic transmission of the present invention;

Fig. 2 is an enlarged schematic diagram of "A" in Fig. 1;

Fig. 3 is an enlarged schematic diagram of "B" of Fig. 1;

Fig. 4 is an enlarged schematic diagram of "C" in Fig. 1;

Fig. 5 is an enlarged schematic diagram of "D" of Fig. 1;

Figure 6 is a schematic diagram of the structure in the "E-E" direction of Figure 3;

FIG. 7 is a schematic diagram of the structure in the "F-F" direction of FIG. 4. FIG.

The best mode of the present invention

The present invention will be described in detail below with reference to Figs. 1-7. For the convenience of description, the following directions are specified as follows: The vertical, horizontal, front, and rear directions mentioned below are consistent with the vertical, horizontal, front, and rear directions of the projection relationship of Fig. 1 itself.

The present invention relates to a trailer device based on pneumatic transmission, which is mainly used for stable dragging of faulty vehicles. The following will further explain the present invention in conjunction with the accompanying drawings of the present invention:

The trailer device based on pneumatic transmission of the present invention includes a device main body 11, the left end of the device main body 11 is fixedly connected to the trailer, the accident car 19 is located on the right side of the device main body 11, and the left end of the accident car 19 is fixedly connected There is a joint 17, a through slot 18 opening forward is provided in the joint 17, a transmission cavity 16 opening to the right is provided in the device main body 11, and a pneumatic device 100 is provided in the transmission cavity 16. An air pump 13 is fixed in the inner wall of the left side of the cavity 16, and the pneumatic device 100 is connected to the air pump 13. The air pump 13 can inflate or inhale into the pneumatic device 100 and drive the pneumatic device 100. The upper and lower ends of the pneumatic device 100 are engaged with a drag device 101, and the air pump 13 drives the pneumatic device 100 and drives the drag device 101, thereby connecting the pneumatic device 100 with the connector 17 , At this time, the trailer is driving and the joint 17 and the accident car 19 are dragged by the pneumatic device 100 and the drag device 101, and a telescopic device 102 is connected between the drag device 101 and the air pump 13 , The air pump 13 drives the drag device 101 to reset through the telescopic device 102, so that the drag device 101 and the joint 17 are separated.

According to an embodiment, the pneumatic device 100 will be described in detail below. The pneumatic device 100 includes a fixed block 12 fixedly connected to the inner wall of the left side of the transmission cavity 16, and the fixed block 12 is provided with a rightward opening The limiting cavity 14, a fixed pipe 40 is fixedly connected to the inner wall on the left side of the limiting cavity 14. The fixed pipe 40 is provided with a gas channel 39 passing through left and right, and the 9 penetrates the fixed block 12 to the left and In communication with the air pump 13, a guide plate 37 is fixedly connected to the right end of the fixed block 12, and a guide groove 38 is provided in the guide plate 37 to pass through left and right, and a sliding plate 41 is slidably provided in the guide groove 38 , The right end of the sliding plate 41 extends outside the transmission cavity 16 and can abut against the joint 17, the sliding plate 41 is provided with an air storage cavity 35 that opens to the left, and the right end of the fixed pipe 40 extends to the In the air storage cavity 35, racks 36 are fixed in the upper and lower ends of the sliding plate 41, and the sliding plate 41 is meshed and connected to the drag device 101 through the racks 36, and the air pump 13 is activated and Inhale air from the gas storage cavity 35 through the gas channel 39, thereby reducing the air pressure in the gas storage cavity 35, and then push the sliding plate 41 to slide to the left under the action of the atmospheric pressure until the sliding The left end of the plate 41 abuts against the left inner wall of the limiting cavity 14, and the sliding plate 41 drives the drag device 101 through the rack 36.

Beneficially, a connecting groove 50 is symmetrically provided in the inner wall on the left side of the limiting cavity 14, and a pushing rod 44 is slidably provided in the connecting groove 50, and the right end of the pushing rod 44 extends to the limiting cavity. In 14, a sliding groove 46 is connected in the inner wall of the communicating groove 50 on the side away from the center of symmetry. The sliding groove 46 is slidably provided with a resetting slider 45, and the resetting slider 45 is fixedly connected to the With the push rod 44, a reset spring 47 is fixedly connected between the left end of the reset slider 45 and the left side inner wall of the sliding groove 46, and a sealing groove 49 is connected in the left inner wall of the communication groove 50. The sealing groove 49 is connected to the gas passage 39, and a baffle 48 is slidably provided in the sealing groove 49, and the baffle 48 can slide into the gas passage 39 and block the gas passage 39, The sliding plate 41 slides to the left and pushes the push rod 44 to slide to the left, thereby pushing the reset slider 45 to slide to the left and compress the reset spring 47, while the push rod 44 pushes the baffle 48 to the left The gas passage 39 slides, thereby reducing the gas flow in the gas passage 39, thereby reducing the sliding speed of the sliding plate 41. When the left end of the sliding plate 41 and the left side of the limiting cavity 14 When the inner wall abuts, the baffle 48 blocks the gas passage 39. When the sliding plate 41 slides to the right and disengages from the push rod 44, the pusher is driven by the elastic force of the return spring 47. The rod 44 slides to the right. At this time, the air pump 13 inflates the gas passage 39. Under the action of air pressure, the baffle 48 slides into the sealing groove 49 to open the gas passage 39 and make the gas passage 39 open. The gas flow rate in the gas channel 39 gradually increases, thereby increasing the sliding speed of the sliding plate 41.

Beneficially, an air pressure probe 34 is fixed on the inner wall of the right side of the air storage cavity 35, and the air pressure probe 34 is electrically connected to the air pump 13, and the air pressure probe 34 monitors the air pressure in the air storage cavity 35 in real time. .

According to an embodiment, the dragging device 101 will be described in detail below. The dragging device 101 includes a restriction groove 33 that penetrates up and down and has a rightward opening and is provided in the guide plate 37, and the restriction groove 33 is up and down. A spur gear 32 is provided symmetrically and rotatably. One end of the spur gear 32 close to the center of symmetry is meshed with the rack 36. A torsion shaft 31 is fixedly connected to the spur gear 32. The rear end of the torsion shaft 31 rotates. Connected to the inner wall of the rear side of the restricting groove 33, the front side of the spur gear 32 is rotatably provided with a rotating rod 23, the front end of the torsion shaft 31 is fixedly connected to the rotating rod 23, and the rotating rod 23 is away from the center of symmetry One end can be turned into the through groove 18 and hooked to the joint 17, the left end of the rotating rod 23 is hinged to the telescopic device 102, the sliding plate 41 slides and drives the spur gear 32 through the rack 36 By rotating, the rotating rod 23 is driven to rotate through the torsion shaft 31, so that the rotating rod 23 is hooked on the joint 17.

Advantageously, a torsion spring 43 is fixedly connected between the rear end of the spur gear 32 and the inner wall of the rear side of the restricting groove 33. When the rotating rod 23 rotates and hooks the joint 17, the torsion shaft 31 The torsion spring 43 is rotated and twisted, so that the torsion spring 43 has elastic force.

Beneficially, the inner walls of the upper and lower sides of the transmission cavity 16 are symmetrically provided with spring grooves 20, and a locking block 22 is slidably provided in the spring groove 20. One end of the locking block 22 away from the center of symmetry is connected to the spring groove. A compression spring 21 is fixedly connected between the inner wall on the side of 20 away from the center of symmetry. The rotating rod 23 is provided with a slot 24 with an opening away from the center of symmetry. The locking block 22 can slide into the slot 24 and be clamped. The rotating rod 23.

According to an embodiment, the telescopic device 102 is described in detail below. The telescopic device 102 includes an L-shaped groove 15 arranged in the inner wall of the left side of the transmission cavity 16 symmetrically up and down, and the L-shaped groove 15 is connected to In the air pump 13, the transmission cavity 16 is provided with a hinge rod 29 which is symmetrical and swingable up and down. The left end of the hinge rod 29 is fixedly connected with an elastic pipe 26, and the left end of the elastic pipe 26 is fixedly connected to the transmission cavity 16 On the left side inner wall, the elastic pipe 26 is provided with a through hole 25 through left and right. The through hole 25 is connected to the L-shaped groove 15, and the hinge rod 29 is provided with a vent groove 28 through left and right. The vent groove 28 is connected to the through hole 25, and a telescopic rod 30 is slidably provided in the vent groove 28. The right end of the telescopic rod 30 is hinged to the rotating rod 23, and the air pump 13 faces the L The groove 15 is inflated, and the telescopic rod 30 is pushed to slide through the through hole 25 and the vent groove 28, and then the rotating rod 23 is pushed.

Advantageously, the hinge rod 29 is provided with a fixed plate 27 symmetrically on both front and rear sides. The left end of the fixed plate 27 is fixedly connected to the inner wall of the left side of the transmission cavity 16, and the hinge rod 29 is symmetrical on both front and rear ends and fixedly connected with The fixed shaft 42 is rotatably connected to the fixed plate 27 at one end away from the center of symmetry.

The following is a detailed description of the steps of using a pneumatic transmission-based trailer device in this article with reference to Figures 1 to 7:

Initially, the right end of the sliding plate 41 abuts against the joint 17, the block 22 extends into the slot 24 and clamps the rotating rod 23, the torsion spring 43 is in the normal state, and the gas channel 39 is in the open state.

When in use, the trailer travels close to the accident vehicle 19 and makes the sliding plate 41 abut against the joint 17. Since the right end of the sliding plate 41 extends out of the transmission cavity 16, it can prevent the trailer from colliding with the accident vehicle and causing secondary damage. Start at this time The air pump 13 then sucks air from the air storage chamber 35 through the gas channel 39, thereby reducing the air pressure in the air storage chamber 35, and then pushing the sliding plate 41 to slide to the left under the action of the atmospheric pressure, while the sliding plate 41 passes through the rack 36 Drive the spur gear 32 to rotate and twist the torsion spring 43. At the same time, the spur gear 32 drives the rotation rod 23 to rotate through the torsion shaft 31. Before the rotation rod 23 hooks the joint 17, the sliding plate 41 first contacts the push rod 44 and pushes the push rod 44 to slide. , Which in turn drives the reset slider 45 to slide and compress the reset spring 47, while the push rod 44 pushes the baffle 48 to slide into the gas channel 39, thereby reducing the flow of the gas channel 39, thereby reducing the sliding speed of the sliding plate 41, thereby reducing The swing speed of the small rotating rod 23 prevents the rotating rod 23 from colliding with the accident car 19. When the sliding plate 41 abuts against the inner wall of the left side of the limit cavity 14, the rotating rod 23 just hooks the joint 17, and the baffle 48 just stops at this time. The gas channel 39 is disconnected. At this time, the air pressure probe 34 detects that the air pressure in the air storage cavity 35 does not change anymore, and then stops the air pump 13. At this time, the trailer is driven and the accident car 19 is dragged by the rotating rod 23 and the joint 17, and the air pump 13 During the inhalation process in the air storage chamber 35, the air pump 13 inflates into the L-shaped groove 15, and then pushes the telescopic rod 30 to slide through the through hole 25 and the ventilation groove 28, thereby pushing the rotating rod 23 and assisting the rotating rod 23 to swing.

When the trailer needs to be separated from the accident vehicle 19, the air pump 13 is activated and the air is sucked from the L-shaped groove 15, which drives the telescopic rod 30 to slide, and then drives the rotating rod 23 to swing and disengage from the joint 17, assisted by the elastic force of the torsion spring 43 The rotating rod 23 swings, and at the same time, the rotating rod 23 drives the spur gear 32 to rotate through the torsion shaft 31, and then drives the sliding plate 41 to slide to the right through the rack 36, thereby disengaging the sliding plate 41 from the push rod 44. At this time, the return spring 47 Under the action of the elastic force, the reset slider 45 and the push rod 44 slide to the right. At this time, the air pump 13 inflates the gas channel 39, and then pushes the baffle 48 to slide into the sealing groove 49 under the action of the air pressure, and then gradually increases the passage of the gas The gas flow of the channel 39 increases the sliding speed of the sliding plate 41 and the swing speed of the rotating rod 23 until the right end of the sliding plate 41 abuts against the joint 17. At this time, the block 22 slides into the card again under the action of the elastic force of the compression spring 21 The rotating rod 23 is clamped in the groove 24.

Through the above methods, those skilled in the art can make various changes according to the working mode within the scope of the present invention.

Claims

A trailer device based on pneumatic transmission, comprising a device main body; the left end of the device main body is fixedly connected to the trailer, the accident vehicle is located on the right side of the device main body, the left end of the accident vehicle is fixedly connected with a joint, and an opening is provided in the joint Forward through slot; The device main body is provided with a transmission cavity with an opening to the right, a pneumatic device is provided in the transmission cavity, and an air pump is fixed in the inner wall of the left side of the transmission cavity, and the pneumatic device is connected to the The air pump is connected, and the air pump can inflate or inhale into the pneumatic device and drive the pneumatic device; the upper and lower ends of the pneumatic device are connected with a drag device, and the air pump drives the pneumatic device And drive the drag device to connect the pneumatic device to the joint. At this time, the trailer drives and drags the joint and the accident vehicle through the pneumatic device and the drag device; A telescopic device is connected between the driving device and the air pump, and the air pump drives the drag device to reset through the telescopic device, thereby disengaging the drag device from the joint.
The trailer device based on pneumatic transmission according to claim 1, characterized in that: the pneumatic device comprises a fixed block fixedly connected to the inner wall of the left side of the transmission cavity, and the fixed block is provided with an opening to the right. The limit cavity of the limit cavity, a fixed pipe is fixedly connected to the left inner wall of the limit cavity, and the fixed pipe is provided with a gas channel through left and right, and the leftward penetrates the fixed block and communicates with the air pump A guide plate is fixedly connected to the right end of the fixed block, and a guide groove is provided in the guide plate to pass through from left to right, a sliding plate is slidably provided in the guide groove, and the right end of the sliding plate extends to the outside of the transmission cavity The sliding plate is provided with an air storage cavity with an opening to the left, the right end of the fixed pipe extends into the air storage cavity, and racks are fixed in the upper and lower ends of the sliding plate , The sliding plate is meshed and connected to the drag device through the rack.
The trailer device based on pneumatic transmission according to claim 2, wherein the inner wall of the left side of the limiting cavity is provided with a communication groove symmetrically up and down, and a push rod is slidably provided in the communication groove, The right end of the pushing rod extends into the limiting cavity, the inner wall of the communicating groove away from the center of symmetry is connected with a sliding groove, and a reset slider is slidably arranged in the sliding groove, and the reset The sliding block is fixedly connected to the pushing rod, and a return spring is fixedly connected between the left end of the resetting sliding block and the inner wall of the left side of the sliding groove; a sealing groove is connected in the inner wall of the left side of the communicating groove, and The sealing groove is connected to the gas passage, and a baffle is slidably provided in the sealing groove, and the baffle can slide into the gas passage and block the gas passage.
The trailer device based on pneumatic transmission according to claim 2, wherein the air pressure probe is fixed on the inner wall of the right side of the air storage cavity, and the air pressure probe is electrically connected to the air pump, and the air pressure probe is electrically connected to the air pump. The probe monitors the air pressure in the air storage cavity in real time.
The trailer device based on pneumatic transmission according to claim 2, characterized in that: the dragging device includes a restriction groove which penetrates up and down and opens to the right in the guide plate, and the restriction groove is up and down. A spur gear is arranged symmetrically and rotatable. One end of the spur gear close to the center of symmetry meshes with the rack, a torsion shaft is fixed in the spur gear, and the rear end of the torsion shaft is rotatably connected to the restricting groove On the inner wall of the rear side, the front side of the spur gear is rotatably provided with a rotating rod, the front end of the torsion shaft is fixedly connected to the rotating rod, and the end of the rotating rod away from the center of symmetry can be turned into the through groove and hooked In the joint, the left end of the rotating rod is hinged to the telescopic device.
The trailer device based on pneumatic transmission according to claim 5, wherein a torsion spring is fixedly connected between the rear end of the spur gear and the inner wall of the rear side of the restriction groove.
The trailer device based on pneumatic transmission according to claim 5, characterized in that: the inner walls of the upper and lower sides of the transmission cavity are symmetrically provided with spring grooves, and the spring grooves are slidably provided with clamping blocks, so A compression spring is fixedly connected between one end of the clamping block away from the symmetric center and the inner wall of the spring groove on the side away from the symmetric center, and a clamping groove with an opening away from the symmetric center is arranged in the rotating rod.
The trailer device based on pneumatic transmission according to claim 5, wherein the telescopic device comprises an L-shaped groove symmetrically arranged in the inner wall of the left side of the transmission cavity, and the L-shaped grooves are communicated with each other. In the air pump; a hinge rod is arranged symmetrically and swingably in the transmission cavity, the left end of the hinge rod is fixedly connected with an elastic pipe, and the left end of the elastic pipe is fixedly connected to the inner wall of the left side of the transmission cavity. The elastic pipe is provided with a through hole extending through from left and right, the through hole is connected to the L-shaped groove, and the hinge rod is provided with a vent groove through the left and right sides, and the vent groove is connected to the through hole. A telescopic rod is slidably arranged in the vent groove, and the right end of the telescopic rod is hinged to the rotating rod.
The trailer device based on pneumatic transmission according to claim 8, wherein the hinge rod is provided with fixing plates symmetrically on both front and rear sides, and the left end of the fixing plate is fixedly connected to the inner wall of the left side of the transmission cavity, The front and rear ends of the hinge rod are symmetrical and fixedly connected with a fixed shaft, and one end of the fixed shaft away from the center of symmetry is rotatably connected to the fixed plate.

To