阅读说明：本技术 一种气动多车轮同步抬起装置及其方法 (Pneumatic multi-wheel synchronous lifting device and method thereof ) 是由 陈雅 蒋晨超 刘涛 于 2020-06-02 设计创作，主要内容包括：本发明公开了一种新型的气动多车轮同步抬起装置及其方法,属于汽车移动技术领域,可用于不同移车和停车需求下同步抬起多个车轮。本装置在机械结构上由液压缸、移位器、抽气打气双用筒和气动软管四个部分组成,在人的外力作用下进行驱动。本装置中,通过设计液压缸、抽气打气双用筒和气动软管,解决了单轮抬动车辆带来的易侧翻及所需移动车辆周围空间狭小不便移动或停车位狭小等问题,保证了本气动多车轮同步抬起装置的安全可靠性和人机和谐性。(The invention discloses a novel pneumatic multi-wheel synchronous lifting device and a method thereof, belongs to the technical field of automobile movement, and can be used for synchronously lifting a plurality of wheels under different automobile moving and parking requirements. The device is composed of a hydraulic cylinder, a shifter, a dual-purpose cylinder for air suction and inflation and a pneumatic hose on a mechanical structure, and is driven under the action of external force of a person. In the device, by designing the hydraulic cylinder, the air pumping and inflating dual-purpose cylinder and the pneumatic hose, the problems that the single-wheel lifting vehicle is easy to turn on one side, the vehicle needs to be moved, the space around the vehicle is narrow and inconvenient to move, the parking space is narrow and small and the like are solved, and the safety reliability and the man-machine harmony of the pneumatic multi-wheel synchronous lifting device are ensured.)

1. The utility model provides a pneumatic many wheels lift up device in step which characterized in that: comprises a hydraulic cylinder (1), a shifter (2), a dual-purpose cylinder (3) for air suction and inflation and a pneumatic hose (4);

the hydraulic cylinder (1) comprises a cavity A (101), a cavity B (102), a piston rod (103), a pressure relief valve (104), a one-way valve (105), a piston block (106), a cavity C (107), a cavity D (108), a return spring (109) and a push plate (110); the cavity A (101) is separated from the cavity B (102) by a piston at the end of the piston rod (103) and is not directly communicated with the cavity B, and the displacement output end of the piston rod (103) extends out of the cavity B (102); a first oil way and a second oil way which are connected in parallel are arranged between the cavity A (101) and the cavity B (102); the first oil way is provided with a pressure release valve (104), the cavity A (101) and the cavity B (102) are communicated through the first oil way after the pressure release valve (104) is opened, the second oil way is provided with two one-way valves (105) and a pump cavity, the pump cavity is divided into a cavity C (107) and a cavity D (108) which are not communicated with each other by a piston block (106), the cavity C (107) is connected in the second oil way in series, and the cavity D (108) is provided with a pipeline connector; the two one-way valves (105) are respectively arranged at the upstream and downstream of the pump cavity, and the conducting directions of the two one-way valves (105) are both from the cavity A (101) to the cavity B (102) in a one-way flow manner; the reset spring (109) and the push plate (110) are both positioned in the cavity A (101), one end of the reset spring (109) is fixed on the inner wall of the cavity A (101), the other end of the reset spring is fixed with the push plate (110), and the reset spring (109) is used for pushing the piston rod (103) to return to an initial position through the push plate (110) in a compressed state;

the hydraulic cylinders (1) and the shifters (2) are multiple, and one hydraulic cylinder (1) is fixed on each shifter (2); the output end of a piston rod (103) of the hydraulic cylinder (1) is used for applying working driving force to the shifter (2);

the air inlet and outlet of the air pumping and inflating dual-purpose cylinder (3) are simultaneously connected with pipeline interfaces on the D cavity (108) in each hydraulic cylinder (1) through a plurality of pneumatic hoses (4) with the same length;

when the pressure relief valve (104) is opened, the return spring (109) pushes the piston rod (103) to move along the axis in the direction of extending out of the hydraulic cylinder (1) through the push plate (110) until the piston rod returns to the initial position, oil flows to the cavity A (101) from the cavity B (102), and all the shifters (2) are driven to be in an open state; under the closing state of the pressure release valve (104), the air suction and inflation double-purpose cylinder (3) is used for reciprocating air suction and inflation, so that the piston blocks (106) in the pump cavities of the hydraulic cylinders (1) synchronously reciprocate, positive pressure and negative pressure alternately appear in the C cavity (107), oil flows to the B cavity (102) from the A cavity (101) in a one-way mode, the piston rod (103) moves along the direction of retracting into the hydraulic cylinder (1) along the axis, and all the shifters (2) are driven to be in a synchronous lifting state.

2. The pneumatic multi-wheel synchronous lifting device according to claim 1, wherein: the shifter (2) comprises a sliding rod (201), a supporting rod (202), a bearing rod (203), a universal wheel (204), a sleeve (205) and a wheel frame (206);

the sliding rod (201) is sleeved in the supporting rod (202) to form a sliding pair for telescopic adjustment, and the sliding rod (201) only has one linear degree of freedom for moving along the axial direction relative to the supporting rod (202); limiting pieces are arranged on the sliding rod (201) and the supporting rod (202), and the limiting pieces are used for temporarily limiting the sliding rod (201) to move relative to the supporting rod (202); two bearing rods (203) are respectively and vertically fixed at one ends of the sliding rod (201) and the supporting rod (202) to form a concave space for accommodating wheels; a sleeve (205) is coaxially sleeved outside each bearing rod (203), and the sleeve (205) can freely rotate around an axis; each end of each bearing rod (203) is fixed with a universal wheel (204) through a wheel carrier (206), and the whole shifter (2) is supported on the ground through four universal wheels (204); the hydraulic cylinder (1) is fixed on the support rod (202), a piston rod (103) in the hydraulic cylinder (1) is fixed with the sliding rod (201), and the sliding rod (201) slides relative to the support rod (202) under the driving of the piston rod (103).

3. The pneumatic multi-wheel synchronous lifting device according to claim 2, wherein: the limiting piece comprises a bolt hole (207) and a bolt (208), the bolt hole (207) is formed in each of the sliding rod (201) and the supporting rod (202), when the sliding rod (201) slides into the supporting rod (202) to the maximum degree, the axes of the two bolt holes (207) are overlapped, and the bolt (208) can be inserted into the bolt holes (207) in a pluggable mode to limit the sliding rod (201) to move relative to the supporting rod (202).

4. The pneumatic multi-wheel synchronous lifting device according to claim 1, wherein: the number of the hydraulic cylinders (1) and the number of the shifters (2) are four.

5. The pneumatic multi-wheel synchronous lifting device according to claim 1, wherein: the pneumatic hose (4) is detachably connected with the hydraulic cylinder (1) and the air pumping and inflating dual-purpose cylinder (3).

6. The pneumatic multi-wheel synchronous lifting device according to claim 1, wherein: after the pressure relief valve (104) is in an open state and the return spring (109) pushes the piston rod (103) to move to a balance position, the distance between the sliding rod (201) and the two bearing rods (203) fixed on the supporting rod (202) is required to ensure that when the shifter (2) is placed on the ground, tires of a vehicle can enter a concave space between the two bearing rods (203).

7. The pneumatic multi-wheel synchronous lifting device according to claim 1, wherein: the air pumping and inflating dual-purpose cylinder (3) is a manual pull-press type inflator.

8. The pneumatic multi-wheel synchronous lifting device according to claim 1, wherein: the length and the pipe diameter of each pneumatic hose (4) are the same, and the air resistance along the path is the same in the use state.

9. The pneumatic multi-wheel synchronous lifting device according to claim 1, wherein: the hydraulic cylinder (1) is detachably fixed on the bottom plate of the support rod (202) through a bolt.

10. A vehicle shifting method using the pneumatic multi-wheel synchronous lifting device according to claim 2, characterized in that: the method comprises the following steps:

s1: placing a shifter (2) on the ground, releasing the limiting effect of a limiting piece on a support rod (202), opening a pressure release valve (104) of a hydraulic cylinder (1), enabling a reset spring (109) to push a piston rod (103) through a push plate (110), and driving a sliding rod (201) to move along the axis in the direction extending out of the hydraulic cylinder (1), when the piston rod (103) moves to a balance position and the distance between two bearing rods (203) reaches the maximum, stopping the movement of the piston rod (103), and screwing the pressure release valve (104);

s2: pushing the shifter (2) in the step S1 to the side of any wheel of the vehicle to be moved, pushing the shifter along the axis direction of the wheel, enabling the wheel to enter a concave space between two bearing rods (203), and keeping a sleeve (205) on the bearing rod (203) fixed on a support rod (202) to be tightly attached to the circumferential surface of the wheel;

s3: connecting an air inlet and an air outlet of the air extracting and inflating dual-purpose cylinder (3) with a D cavity (108) of the shifter (2) corresponding to the hydraulic cylinder (1) in the S1 through a pneumatic hose (4);

s4: the rest shifters (2) are operated according to the steps from S1 to S3, so that the shifters are respectively positioned at different wheels of the vehicle;

s5: air is pumped and inflated in a reciprocating way through the air pumping and inflating dual-purpose cylinder (3); when the air pumping and inflating dual-purpose cylinder (3) performs air pumping, air in a D cavity (108) of each hydraulic cylinder (1) flows into the air pumping and inflating dual-purpose cylinder (3) through a pneumatic hose (4), the air pressure of a C cavity (107) is larger than that of the D cavity (108), a piston block (106) moves towards the D cavity (108), and oil in the A cavity (101) is pumped to the C cavity (107) under the action of the air pressure difference between the C cavity (107) and the D cavity (108) and a check valve (105); when the air extracting and inflating dual-purpose cylinder (3) inflates, air in the air extracting and inflating dual-purpose cylinder (3) synchronously flows into a D cavity (108) of each hydraulic cylinder (1) through a pneumatic hose (4), the air pressure of the D cavity (108) is greater than that of a C cavity (107), a piston block (106) moves towards the C cavity (107), and oil in the C cavity (107) is pumped towards the B cavity (102) under the action of the air pressure difference between the C cavity (107) and the D cavity (108) and a one-way valve (105); in the reciprocating air extraction and inflation processes, oil of the whole hydraulic cylinder (1) continuously flows from the cavity A (101) to the cavity B (102), a piston rod (103) is driven to retract into the hydraulic cylinder (1), the distance between the two bearing rods (203) is shortened, the bearing rods (203) fixed with the sliding rod (201) gradually approach to wheels to apply extrusion force to the two sides of the wheels, and the wheels are synchronously lifted through the rolling of the sleeve (205) and the extrusion action of the bearing rods (203) on the two sides;

s6: keeping the state that different wheels of the vehicle are all lifted by each shifter (2), after the vehicle is pushed to a target area, opening a pressure release valve (104), communicating two oil cavities of a hydraulic cylinder (1), pushing a piston rod (103) to reset by a reset spring (109) in the hydraulic cylinder (1) to enable the distance between two bearing rods (203) to be increased until the four wheels are completely supported on the ground, enabling no vertical acting force to exist between a sleeve (205) and the wheels, and screwing the pressure release valve (104) after the vehicle stops in the area;

s7: pushing the shifter (2) out of the position of the wheel, and performing air suction and inflation in a reciprocating manner through the air suction and inflation dual-purpose cylinder (3), so that the distance between two bearing rods (203) in the shifter (2) is contracted to the shortest state, and the relative movement between the support rod (202) and the sliding rod (201) is locked by using a limiting piece;

s8: the air pumping and inflating dual-purpose cylinder (3), the pneumatic hose (4) and the hydraulic cylinder (1) are disassembled and then are stored for standby.

Technical Field

The invention relates to the technical field of automobile movement, in particular to a pneumatic multi-wheel synchronous lifting device and a method thereof.

Background

With the increase of the popularization rate of automobiles in China, the automobile holding amount is rapidly increased, and certain negative effects are brought successively, such as difficulty in parking caused by illegal parking of the automobiles, occupation of fire fighting channels and narrow parking spaces.

In order to solve the above problems, a series of auxiliary devices for fast moving vehicles are manufactured on the market. The vehicle moving device for moving the whole vehicle, such as a hydraulic trailer, is convenient for moving the vehicle, but occupies a larger space, and the front or the rear of the vehicle needs to be ensured to have a larger space in the using process, so that the vehicle can not be moved laterally. The single-wheel moving vehicle shifter can move the whole vehicle only by sequentially lifting each wheel, and the single-wheel lifting vehicle is easy to cause the vehicle to turn over and damage the vehicle.

Therefore, a vehicle moving device is needed to be designed, so that multiple wheels can be lifted synchronously, the requirement on the space around the vehicle is not large, the vehicle can be moved laterally, and different parking requirements are met; each part of the device is assembled and disassembled in a modularized mode, the storage is convenient, and the occupied space is small.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides a pneumatic multi-wheel synchronous lifting device. The specific technical scheme is as follows:

a pneumatic multi-wheel synchronous lifting device comprises a hydraulic cylinder, a shifter, a dual-purpose cylinder for air suction and air inflation and a pneumatic hose;

the hydraulic cylinder comprises a cavity A, a cavity B, a piston rod, a pressure release valve, a one-way valve, a piston block, a cavity C, a cavity D, a return spring and a push plate; the cavity A and the cavity B are separated by a piston at the end part of a piston rod and are not directly communicated, and the displacement output end of the piston rod extends out of the cavity B; a first oil way and a second oil way which are connected in parallel are arranged between the cavity A and the cavity B; the first oil way is provided with a pressure relief valve, the cavity A and the cavity B are communicated through the first oil way after the pressure relief valve is opened, the second oil way is provided with two one-way valves and a pump cavity, the pump cavity is divided into a cavity C and a cavity D which are not communicated with each other by a piston block, the cavity C is connected in series with the second oil way, and the cavity D is provided with a pipeline connector; the two one-way valves are respectively arranged at the upstream and downstream of the pump cavity, and the conduction directions of the two one-way valves are from the cavity A to the cavity B in a one-way flow manner; the reset spring and the push plate are both positioned in the cavity A, one end of the reset spring is fixed on the inner wall of the cavity A, the other end of the reset spring is fixed with the push plate, and the reset spring is used for pushing the piston rod to return to an initial position through the push plate in a compressed state;

the hydraulic cylinders and the shifters are multiple, and one hydraulic cylinder is fixed on each shifter; the output end of a piston rod of the hydraulic cylinder is used for applying working driving force to the shifter;

the air inlet and outlet of the air pumping and inflating dual-purpose cylinder are simultaneously connected with pipeline interfaces on the D cavity in each hydraulic cylinder through a plurality of pneumatic hoses with the same length;

when the pressure release valve is opened, the return spring pushes the piston rod to move along the axis in the direction of extending out of the hydraulic cylinder until the piston rod returns to the initial position, and oil flows from the cavity B to the cavity A to drive all the shifters to be in an open state; under the closing state of the pressure release valve, the air pumping and inflating dual-purpose cylinder performs reciprocating air pumping and inflating to ensure that the piston blocks in the pump cavities of the hydraulic cylinders synchronously reciprocate, positive pressure and negative pressure alternately appear in the C cavity, so that oil flows from the A cavity to the B cavity in a one-way mode, the piston rod moves along the axis to the direction of retracting the hydraulic cylinders, and all the shifters are driven to be in a synchronous lifting state.

Preferably, the shifter comprises a sliding rod, a supporting rod, a bearing rod, a universal wheel, a sleeve and a wheel frame;

the sliding rod is sleeved in the supporting rod to form a sliding pair for telescopic adjustment, and the sliding rod has only one linear degree of freedom for movement along the axial direction relative to the supporting rod; the limiting pieces are arranged on the sliding rod and the supporting rod and used for temporarily limiting the sliding rod to move relative to the supporting rod; the two bearing rods are respectively and vertically fixed at one ends of the sliding rod and the supporting rod to form a concave space for accommodating wheels; a sleeve is coaxially sleeved outside each bearing rod and can freely rotate around the axis; each end of each bearing rod is fixed with a universal wheel through a wheel carrier, and the whole shifter is supported on the ground through four universal wheels; the hydraulic cylinder is fixed on the support rod, a piston rod in the hydraulic cylinder is fixed with the sliding rod, and the sliding rod slides relative to the support rod under the driving of the piston rod.

Preferably, the limiting part comprises a bolt hole and a bolt, the sliding rod and the supporting rod are respectively provided with a bolt hole, when the sliding rod slides into the supporting rod to the maximum extent, the axes of the two bolt holes are overlapped, and the bolt can be inserted into the bolt hole in a pluggable mode so as to limit the movement of the sliding rod relative to the supporting rod.

Preferably, the number of the hydraulic cylinders and the number of the shifters are four.

Preferably, the pneumatic hose is detachably connected with the hydraulic cylinder and the air pumping and inflating dual-purpose cylinder.

Preferably, after the pressure relief valve is in an open state and the return spring pushes the piston rod to move to a balance position, the distance between the two bearing rods fixed on the sliding rod and the supporting rod should be enough to ensure that the tire of the vehicle can enter the concave space between the two bearing rods when the shifter is placed on the ground.

Preferably, the air pumping and inflating dual-purpose cylinder is a manual pull-press type inflator.

Preferably, the length and the pipe diameter of each pneumatic hose are the same, and the air resistance along the path is the same in the use state.

Preferably, the hydraulic cylinder is detachably fixed on the bottom plate of the support rod through a bolt.

Another object of the present invention is to provide a vehicle shifting method using the pneumatic multi-wheel synchronous lifting device, which comprises the following steps:

s1: placing a shifter on the ground, removing the limiting effect of a limiting piece on a supporting rod, opening a pressure release valve of a hydraulic cylinder, enabling a reset spring to push a piston rod through a push plate and driving a sliding rod to move along the axis in the direction extending out of the hydraulic cylinder, and when the piston rod moves to a balance position and the distance between two bearing rods reaches the maximum, stopping the movement of the piston rod and screwing down the pressure release valve;

s2: pushing the shifter in the S1 to the side of any wheel of the vehicle to be moved, pushing the shifter along the axis direction of the wheel, enabling the wheel to enter a concave space between two bearing rods, and keeping a sleeve on the bearing rod fixed on the supporting rod to be tightly attached to the circumferential surface of the wheel;

s3: connecting an air inlet and an air outlet of the air pumping and inflating dual-purpose cylinder with a D cavity of the shifter corresponding to the hydraulic cylinder in the S1 through a pneumatic hose;

s4: operating the rest shifters according to the steps of S1-S3, so that the rest shifters are respectively positioned at different wheels of the vehicle;

s5: air is pumped and inflated in a reciprocating way through the air pumping and inflating dual-purpose cylinder; when the air pumping and inflating dual-purpose cylinder pumps air, air in a cavity D of each hydraulic cylinder flows into the air pumping and inflating dual-purpose cylinder through a pneumatic hose, the air pressure of the cavity C is larger than that of the cavity D, the piston block moves towards the cavity D, and oil in the cavity A is pumped to the cavity C under the action of the air pressure difference between the cavity C and the cavity D and the action of the one-way valve; when the air pumping and inflating dual-purpose cylinder is used for inflating, air in the air pumping and inflating dual-purpose cylinder synchronously flows into a cavity D of each hydraulic cylinder through a pneumatic hose, the air pressure of the cavity D is larger than that of the cavity C, the piston block moves towards the cavity C, and oil in the cavity C is pumped towards the cavity B under the action of the air pressure difference between the cavity C and the cavity D and the one-way valve; in the process of reciprocating air extraction and inflation, oil liquid of the whole hydraulic cylinder continuously flows from the cavity A to the cavity B to drive the piston rod to retract into the hydraulic cylinder, so that the distance between the two bearing rods is shortened, the bearing rods fixed with the sliding rod gradually approach the wheels to apply extrusion force to the two sides of the wheels, and the wheels are synchronously lifted through the rolling of the sleeve and the extrusion action of the bearing rods on the two sides;

s6: keeping the state that different wheels of the vehicle are all lifted by each shifter, after the vehicle is pushed to a target area, opening a pressure release valve to communicate two oil cavities of a hydraulic cylinder, pushing a piston rod to reset by a reset spring in the hydraulic cylinder to enable the distance between two bearing rods to be increased until the four wheels are completely supported on the ground, enabling no vertical acting force to exist between a sleeve and the wheels, and screwing down the pressure release valve after the vehicle stops in the area;

s7: pushing the shifter out of the position of the wheel, and performing air suction and air inflation in a reciprocating manner through an air suction and air inflation dual-purpose cylinder, so that the distance between two bearing rods in the shifter is contracted to the shortest state, and the relative movement between the support rod and the sliding rod is locked by utilizing a limiting piece;

s8: the air pumping and inflating dual-purpose cylinder, the pneumatic hose and the hydraulic cylinder are disassembled and then are stored for standby.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention can realize synchronous lifting of a plurality of wheels, has stable vehicle moving process, little damage to vehicles and difficult side turning;

(2) the invention can meet different parking requirements, can realize lateral parking, reversing and other actions, and has little requirement on the space around the vehicle;

(3) the invention can make the whole machine up of modular parts, is convenient to disassemble and assemble and is convenient for a user to carry.

Drawings

FIG. 1 is a top view of a pneumatic multi-wheel synchronous lifting device in a working state;

FIG. 2 is a front view of the pneumatic multi-wheel synchronous lifting device in a working state;

FIG. 3 is a schematic view of the internal operation of a hydraulic cylinder of the pneumatic multi-wheel synchronous lifting device;

FIG. 4 is a top view of the pneumatic multi-wheel synchronous lifting device shifter;

FIG. 5 is a front view of a pneumatic multi-wheel synchronous lifting device shifter;

fig. 6 is a schematic view of the engagement relationship between the shifter and the wheel.

In the figure, a hydraulic cylinder 1, a cavity A101, a cavity B102, a piston rod 103, a pressure relief valve 104, a one-way valve 105, a piston block 106, a cavity C107, a cavity D108, a return spring 109, a shifter 2, a sliding rod 201, a support rod 202, a bearing rod 203, a universal wheel 204, a sleeve 205, a wheel frame 206, a bolt hole 207, a bolt 208, an air pumping and inflating dual-purpose cylinder 3, a pneumatic hose 4 and a wheel 5.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

Fig. 1 and 2 show detailed structures of different angles of a pneumatic multi-wheel synchronous lifting device in a working state, which mainly comprises a hydraulic cylinder 1, a shifter 2, an air extracting and inflating dual-purpose cylinder 3 and a pneumatic hose 4, and can be used under different vehicle moving and parking requirements to realize synchronous lifting of multiple wheels. The basic functions of each part are as follows:

the hydraulic cylinder 1 and the shifter 2 are multiple, one hydraulic cylinder 1 is fixed on each shifter 2, and the output end of a piston rod 103 of each hydraulic cylinder 1 is used for applying driving force for lifting operation to the shifter 2. The hydraulic cylinder 1 and the shifter 2 are used in pairs, and the hydraulic cylinder and the shifter are used for driving one wheel to lift in a group mode. Therefore, when a plurality of wheels need to be lifted synchronously, a plurality of sets of the hydraulic cylinder 1 and the shifter 2 are required. Since a typical vehicle has four wheels, the following description will be given taking the example of synchronous lifting of four wheels. Of course, in other embodiments, the number of sets of hydraulic cylinders 1 and displacers 2 may be adjusted according to the number of wheels of the vehicle.

The air pumping and inflating dual-purpose cylinder 3 is respectively connected with air outlet and inlet ports of the hydraulic cylinders 1 fixed on the four shifters 2 through four pneumatic hoses 4 with equal length. The user pulls up and pushes down the in-process of the double-purpose section of thick bamboo 3 of inflating of bleeding, and the gas in 1 intracavity of pneumatic cylinder and the double-purpose section of thick bamboo 3 of inflating of bleeding make a round trip to flow and produce the atmospheric pressure difference through pneumatic hose 4 in, makes the fluid unidirectional flow in the remaining intracavity of pneumatic cylinder 1, thereby makes the moving part of pneumatic cylinder 1 move to the direction that is close to pneumatic cylinder 1 along the axis, and the moving part of averager 2 keeps same movement track, and then lifts up four wheels in step.

The mechanical structure of these parts will be described in detail below.

Fig. 3 is a schematic diagram of the internal operation of a hydraulic cylinder of the pneumatic multi-wheel synchronous lifting device, wherein the hydraulic cylinder 1 comprises a cavity A101, a cavity B102, a piston rod 103, a pressure relief valve 104, a one-way valve 105, a piston block 106, a cavity C107, a cavity D108, a return spring 109 and a push plate 110. The cavity A101 and the cavity B102 are not directly communicated through piston separation at the end of the piston rod 103, and the displacement output end of the piston rod 103 extends out of the cavity B102. A first oil path and a second oil path which are connected in parallel are arranged between the cavity A101 and the cavity B102. A pressure release valve 104 is arranged on the first oil path, the cavity A101 and the cavity B102 are communicated through the first oil path after the pressure release valve 104 is opened, and the first oil path can be kept not communicated when the pressure release valve 104 is closed. The second oil path is provided with two one-way valves 105 and a pump cavity, the pump cavity is divided into a C cavity 107 and a D cavity 108 which are not communicated with each other by a piston block 106, the C cavity 107 is connected in series in the second oil path, and the D cavity 108 is provided with a pipeline connector; the two check valves 105 are respectively arranged at the upstream and downstream of the pump cavity, and the conducting directions of the two check valves 105 are both from the A cavity 101 to the B cavity 102 in a one-way flow mode. Therefore, when the piston block 106 moves towards the D cavity 108, negative pressure is formed in the C cavity 107, and oil in the A cavity 101 enters the C cavity 107 under the action of the two one-way valves 105; when the piston block 106 moves towards the C cavity 107, positive pressure is formed in the C cavity 107, and oil in the C cavity 107 is discharged from the C cavity 107 into the B cavity 102 under the action of the two one-way valves 105, so that the purpose of one-way oil transportation is achieved.

The return spring 109 and the push plate 110 are both positioned in the cavity A101, one end of the return spring 109 is fixed on the inner wall of the cavity A101, and the other end of the return spring is fixed on the push plate 110. The push plate 110 is sized to exactly match the cross-section of the a-cavity 101 and the B-cavity 102 so that it can slide axially within the cavities. The return spring 109 may be compressed by the piston rod 103 and acts to urge the piston rod 103 to return to the initial position by the push plate 110 in the compressed state.

The air pumping and inflating dual-purpose cylinder 3 can adopt a manual pull-press type inflator, so that the vehicle can be lifted without an external power supply. A plurality of air inlets and outlets can be arranged on the air pumping and inflating dual-purpose cylinder 3, and the air inlets and outlets of the air pumping and inflating dual-purpose cylinder 3 are simultaneously connected with pipeline interfaces on the D cavity 108 of each hydraulic cylinder 1 through a plurality of pneumatic hoses 4 with the same length. In order to facilitate the disassembly and storage, the pneumatic hose 4 and the hydraulic cylinder 1 can be detachably connected with the air pumping and inflating dual-purpose cylinder 3. If the effective gas outlet quantity that admits air of single use is less than the gas extraction and inflates the gas outlet quantity that admits air that actually has on the double-purpose section of thick bamboo 3, then can set up a plurality of clogs up, carry out interim shutoff to the gas outlet of admitting air that does not use temporarily to avoid gas leakage. In addition, the pneumatic hose 4 can also be provided with a plug for plugging the pipe orifice in the storage process, and impurities are prevented from entering the pipe.

In order to ensure the lifting synchronism of each vehicle, the length and the pipe diameter of each pneumatic hose 4 are the same, and the pneumatic hose should be stretched as much as possible in a use state without bending, so that the pneumatic resistance along the way is the same.

The working process of the synchronous lifting device is as follows: when the pressure relief valve 104 is opened, the return spring 109 pushes the piston rod 103 to move along the axis in the direction of extending out of the hydraulic cylinder 1 through the push plate 110 until the piston rod returns to the initial position, oil flows from the cavity B102 to the cavity A101, and all the shifters 2 are driven to be in an open state; under the closing state of the pressure release valve 104, the air extracting and inflating dual-purpose cylinder 3 performs reciprocating air extracting and inflating to ensure that the piston blocks 106 in the pump cavities of the hydraulic cylinders 1 synchronously reciprocate, positive pressure and negative pressure alternately appear in the cavity C107, oil flows from the cavity A101 to the cavity B102 in a one-way mode, and the piston rod 103 moves along the axis in the direction of retracting into the hydraulic cylinder 1 to drive all the shifters 2 to be in a synchronous lifting state.

In the present embodiment, fig. 4 and 5 are detailed structures of the pneumatic multi-wheel synchronous lifting device shifter in different angles. The displacer 2 includes a slide bar 201, a support bar 202, a bearing bar 203, a universal wheel 204, a sleeve 205, and a wheel frame 206.

The support rod 202 is a rod body with a hollow inner cavity, the sliding rod 201 is sleeved in the support rod 202 to form a telescopic sliding pair, and the sliding rod 201 only has one linear degree of freedom moving along the axial direction relative to the support rod 202. Since the shifter 2 is required to bear the dead weight of the vehicle during the process of lifting the wheel, the sliding rod 201 and the supporting rod 202 are provided with limit pieces for temporarily limiting the movement of the sliding rod 201 relative to the supporting rod 202. In this embodiment, the position-limiting member includes a pin hole 207 and a pin 208, and the sliding rod 201 and the supporting rod 202 have one pin hole 207, respectively, so that when the sliding rod 201 slides into the supporting rod 202 to the maximum extent, the axes of the two pin holes 207 are coincident, and the pin 208 is inserted into the pin hole 207 to limit the movement of the sliding rod 201 relative to the supporting rod 202. When the limit is required to be cancelled, the latch 208 can be pulled out of the latch hole 207, and the relative movement between the sliding rod 201 and the supporting rod 202 is restored.

The lifting of the wheels by the displacer 2 is performed by the pressing action of the two bearing bars 203. Two bearing rods 203 are vertically fixed at one ends of the sliding rod 201 and the supporting rod 202, respectively, to form a concave space for accommodating a wheel. Each bearing rod 203 is coaxially sleeved with a sleeve 205, and the sleeve 205 can freely rotate around the axis. Each end of each bearing rod 203 is fixed with a universal wheel 204 through a wheel frame 206, and the whole shifter 2 is supported on the ground through four universal wheels 204. The shifter 2 is placed on the ground for use, and the bearing rod 203 is positioned at a height slightly higher than the bottom surface but much lower than the wheel axle of the wheel. When the vehicle is stopped on the ground, only the bottom of the outer circumferential surface of the wheel is in contact with the ground. Referring to fig. 6, the shifter 2 may be moved to allow the wheel 5 to enter the concave space between the two support rods 202 in the direction of the arrow in the figure, and then the distance between the two support rods 203 is gradually decreased to apply a pressing force to the lower portion of the outer circumferential surface of the wheel 5, so that the wheel 5 is gradually separated from the ground and supported on the two support rods 203. Because the wheel 5 is made of rubber, the sleeve 205 which can freely rotate outside the bearing rod 203 can rotate, and excessive friction force generated in the process that the wheel 5 is extruded by the bearing rod 203 is avoided.

The lifting power of the shifter 2 is provided by a hydraulic cylinder 1, and the hydraulic cylinder 1 can be detachably fixed on the bottom plate of the support rod 202 through bolts. The piston rod 103 in the hydraulic cylinder 1 is fixed to the slide rod 201, and the slide rod 201 slides relative to the support rod 202 by the drive of the piston rod 103. When the distance between the two bearing rods 203 is continuously drawn to continuously clamp the wheel, the wheel is in a lifting state.

In order to facilitate the wheel locking, after the pressure relief valve 104 is in the open state and the return spring 109 pushes the piston rod 103 to move to the equilibrium position, the distance between the two bearing rods 203 fixed on the sliding rod 201 and the supporting rod 202 should be such that the tire of the vehicle can enter the concave space between the two bearing rods 203 when the shifter 2 is placed on the ground.

Based on the pneumatic multi-wheel synchronous lifting device, the invention also provides a vehicle displacement method using the device, which comprises the following steps:

s1: the shifter 2 is placed on the ground, the bolt 208 is pulled out, the limiting action between the support rod 202 and the sliding rod 201 is removed, the pressure release valve 104 of the hydraulic cylinder 1 is opened, the return spring 109 pushes the piston rod 103 through the push plate 110 and drives the sliding rod 201 to move along the axis in the direction extending out of the hydraulic cylinder 1, when the piston rod 103 moves to the balance position and the distance between the two bearing rods 203 reaches the maximum, the piston rod 103 stops moving, and the pressure release valve 104 is screwed down.

S2: the shifter 2 in S1 is pushed to the side of any wheel of the vehicle to be moved, and pushed in the axial direction of the wheel 5, that is, in the direction of the arrow in fig. 6, so that the wheel 5 enters the concave space between the two bearing rods 203, and the sleeve 205 on the bearing rod 203 fixed on the support rod 202 is held tightly against the circumferential surface of the wheel.

S3: after the shifter 2 and the air outlet inlet of the air pumping and inflating dual-purpose cylinder 3 are unplugged, the air inlet and outlet of the air pumping and inflating dual-purpose cylinder 3 are connected with the D cavity 108 of the shifter 2 corresponding to the hydraulic cylinder 1 in the S1 through the pneumatic hose 4.

S4: the rest of the shifters 2 are operated according to the steps of S1 to S3 to be respectively located at different wheels of the vehicle;

s5: the air is pumped and inflated in a reciprocating way through the air pumping and inflating dual-purpose cylinder 3. When the air extracting and inflating dual-purpose cylinder 3 extracts air, air in the D cavity 108 of each hydraulic cylinder 1 flows into the air extracting and inflating dual-purpose cylinder 3 through the pneumatic hose 4, the air pressure of the C cavity 107 is larger than that of the D cavity 108, the piston block 106 moves towards the D cavity 108, and oil in the A cavity 101 is extracted to the C cavity 107 under the action of the air pressure difference between the C cavity 107 and the D cavity 108 and the check valve 105. When the air extracting and inflating dual-purpose cylinder 3 is inflated, air in the air extracting and inflating dual-purpose cylinder 3 synchronously flows into a D cavity 108 of each hydraulic cylinder 1 through the pneumatic hose 4, the air pressure of the D cavity 108 is larger than that of a C cavity 107, the piston block 106 moves towards the C cavity 107, and oil in the C cavity 107 is pumped towards the B cavity 102 under the action of the air pressure difference between the C cavity 107 and the D cavity 108 and the one-way valve 105. In the reciprocating air suction and inflation process, oil of the whole hydraulic cylinder 1 continuously flows from the cavity A101 to the cavity B102, the piston rod 103 is driven to retract into the hydraulic cylinder 1, the distance between the two bearing rods 203 is shortened, the bearing rods 203 fixed with the sliding rod 201 gradually approach to the wheels to apply extrusion force to the two sides of the wheels, and the wheels are lifted synchronously through rolling of the sleeve 205 and extrusion action of the bearing rods 203 on the two sides.

S6: keeping the state that different wheels of the vehicle are all lifted by each shifter 2, after the vehicle is pushed to a target area, opening the pressure release valve 104 to communicate two oil cavities of the hydraulic cylinder 1, pushing the piston rod 103 to reset by the reset spring 109 in the hydraulic cylinder 1 to enable the distance between the two bearing rods 203 to be increased, at the moment, the vehicle is supported by four wheels, no vertical acting force exists between the sleeve 205 and the wheels, and the vehicle is in a separation state. The vehicle can thus complete the displacement, parking in this area and finally tightening the relief valve 104.

S7: the shifter 2 is pushed out of the position of the wheel, air is pumped and inflated in a reciprocating mode through the air pumping and inflating dual-purpose cylinder 3, the distance between two bearing rods 203 in the shifter 2 is contracted to the shortest state, and the limiting piece is used for locking the relative movement between the supporting rod 202 and the sliding rod 201;

s8: after the pneumatic hose 4 connected between the shifter 2 and the air outlet and inlet port of the air pumping and inflating dual-purpose cylinder 3 is pulled out in sequence, the air outlet and inlet port is plugged immediately by plugging. After the air pumping and inflating dual-purpose cylinder 3, the pneumatic hose 4 and the hydraulic cylinder 1 are disassembled, the air pumping and inflating dual-purpose cylinder can be stored for standby.

Therefore, the synchronous lifting device consists of a hydraulic cylinder, a shifter, a dual-purpose cylinder for air suction and air inflation and a pneumatic hose on a mechanical structure, and can be driven under the action of external force of a person. In the device, by designing the hydraulic cylinder, the air pumping and inflating dual-purpose cylinder and the pneumatic hose, the problems that the single-wheel lifting vehicle is easy to turn on one side, the vehicle needs to be moved, the space around the vehicle is narrow and inconvenient to move, the parking space is narrow and small and the like are solved, and the safety reliability and the man-machine harmony of the pneumatic multi-wheel synchronous lifting device are ensured.

The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.