Car body skirt limiting device and car body lifting appliance

Abstract

The vehicle body skirt limiting device comprises two sets of side clamp limiting structures, a plurality of soft cushion bags are arranged on the surfaces of side clamp belts of the side clamp limiting structures in a soft contact mode along the vehicle body skirt, liquid injection pipe sets communicated with the soft cushion bags are arranged on the sides, away from a vehicle body, of the side clamp belts, and one ends of the side clamp belts achieve telescopic reset through a tape type rolling rod in a containing box; a liquid storage box and a liquid return plate connected with a hydraulic spring are further arranged in the containing box and used for buffering and storing hydraulic oil, the vehicle body lifting tool comprises a back-swing structure, a piston body of a driving liquid chamber in an outer pipe body of the vehicle body lifting tool is matched with a spiral groove through a limiting protruding point, the gravity of a vehicle body drives the piston body to rotate and move upwards during lifting, and automatic returning of the vehicle body is achieved. Linkage with the electric push rod and the abutting frame is achieved, and the movement interval and the rotation angle of the piston body are accurately matched; soft contact limiting is achieved through liquid filling expansion of the soft cushion bag, skirt edge abrasion is avoided, and meanwhile the loading efficiency is improved by means of automatic returning of the back-swing structure.

Description

Technical Field

[0001] This invention relates to the field of lifting equipment technology, specifically to a vehicle body skirt limiting device and a vehicle body lifting device. Background Technology

[0002] Against the backdrop of global energy transition and the widespread adoption of environmental protection concepts, new energy vehicles have become a core direction for the upgrading of the automotive industry due to their core advantages of zero emissions and low energy consumption. Their market penetration rate continues to increase, placing higher demands on the overall performance of vehicle body structures. As a key component of the vehicle's side profile, the design and functional adaptation of the side skirts directly affect the overall performance of new energy vehicles. They must not only meet the core development needs of lightweighting and aerodynamic optimization to improve range, but also satisfy users' aesthetic expectations for the overall aesthetics and streamlined appearance of the vehicle. Simultaneously, they must adapt to the chassis layout characteristics of new energy vehicles, providing compliant protection and installation support for core components such as battery packs and motors. This has become a crucial design element in balancing vehicle performance, appearance, and practicality. With the iterative upgrading of new energy vehicle technology, their importance in the integrated design of the entire vehicle is becoming increasingly prominent.

[0003] However, in conventional new energy vehicle hoisting operations, the side skirts of the vehicle body are prone to surface wear after being tied with straps during transportation. This wear not only damages the integrity of the vehicle's appearance and affects its aesthetics, but may also cause the side skirt coating to peel off and the structure to be damaged, thereby increasing vehicle maintenance costs and economic losses in hoisting operations, and causing unnecessary trouble for users.

[0004] To address this, a vehicle body skirt limiting device and a vehicle body lifting device are proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a vehicle body skirt limiting device and a vehicle body lifting device to solve the problem of skirt surface wear during the lifting of new energy vehicles as mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a vehicle body side skirt limiting device, comprising:

[0007] The side clamp limiting structure is set in pairs and is attached and bound to the side skirts of the crane truck during hoisting.

[0008] The side clamp limiting structure includes a side clamp strap. The surface of the side clamp strap is integrally provided with multiple soft pads from top to bottom along the surface of the vehicle body skirt. The side clamp strap is provided with an injection tube assembly on the side away from the vehicle body, communicating with the soft pads.

[0009] Preferably, the side clamp limiting structure further includes a lifting beam, the length of which is greater than or equal to the length of the vehicle being lifted, and multiple hanging ears are integrally welded on both the upper and lower surfaces. The hanging ears on the upper and lower sides are respectively connected and bound to the hanging ears and straps on the surface of the swing structure by steel wire ropes. After the straps are bound to the wheel hub, the side clamp straps are integrally sewn to the side of the straps near the skirt edge.

[0010] Preferably, one end of the side clamp is wound and fixed inside the receiving box, in a receiving chamber located on the same side as the side clamp. The receiving chamber is equipped with a winding roller that returns to its original position after twisting, similar to a measuring tape. The main body of the receiving box protrudes downward from the side clamp, and a liquid storage tank is provided inside the protruding part. At least one hydraulic spring is elastically connected to a return plate at the bottom of the liquid storage tank. The receiving box is connected to an interface between its bottom surface and the inside of the liquid storage tank via a pipeline to an injection pipe assembly. The injection pipe assembly consists of multiple pipelines connected to the soft pad and a main pipeline for rectifying these pipelines.

[0011] A vehicle body lifting device, comprising:

[0012] The swing structure has lifting lugs on both the upper and lower surfaces, and the upper lifting lugs are connected and bound to the lifting equipment by steel wire ropes;

[0013] The swing structure includes an outer tube body, inside which is a vertically penetrating driving liquid chamber. A piston body is slidably sealed to the lower part of the driving liquid chamber. Two defining protrusions are integrally formed symmetrically along the axis at the center of the piston body's side. During lifting, under the weight of the vehicle, the piston body, in conjunction with the defining protrusions, rotates upward along a concave spiral groove formed in the inner wall of the driving liquid chamber. The upper end of the piston body slides through the outer tube body and is bolted to the center of the bottom surface of the lifting connector after connecting to a mounting base. Multiple electric actuators are inserted and positioned within the lower part of the outer tube body around the driving liquid chamber. The output ends are all bolted to C-shaped abutments, which are slidably constrained within a groove inside the outer tube that connects to the inner wall of the driving liquid chamber. The end of the abutment inside the driving liquid chamber works with an annular plate fitted onto the piston rod to constrain the range of motion of the piston end. The bottom of the outer tube has stepped slots, and a limiting spring works inside the slots to slide and constrain the limiting rod. The lower end of the limiting rod passes through a prism hole at the bottom of the outer tube and is integrally connected to the lifting base. The limiting rod contains an angle sensor that detects the rotation of the lifting base, and the angle sensor transmits the detected angle signal to the electric actuator through a circuit.

[0014] Preferably, a return spring is sleeved on the piston rod, and the return spring provides elastic restraint within the drive fluid chamber, wherein the gravity of the swing structure and the side clamp limiting structure is insufficient to cause elastic deformation of the return spring.

[0015] Preferably, the side of the outer tube is provided with an interface for circulating internally stored hydraulic oil above the corresponding drive liquid chamber, and the interface is connected to the injection pipe assembly to realize the connection between the drive liquid chamber and the soft pad bladder.

[0016] Preferably, the lifting connector is connected to the lifting equipment via a steel wire rope, using an integrally formed lug on its upper surface.

[0017] Preferably, the bottom surface of the lifting connector is fitted with an embedded bearing and a rotating sleeve that is rotatably constrained by inserting the upper push center. The lower ring surface of the rotating sleeve is connected to multiple passively telescopic hydraulic rods through a mounting seat. The hydraulic rods are inserted and positioned in an assembly groove located above the outer tube body around the drive fluid chamber.

[0018] Preferably, the bottom surface of the lifting base has multiple integrated lugs, which are connected and bound to two lifting beams via steel wire ropes. The lifting beam consists of an end plate that slides along its slot, a prism connected to the end plate, and a cylinder with a radius smaller than the prism connected to the lower end of the prism. The cylinder is connected to the lifting base, and initially, the cylinder is movably positioned within the prism hole at the bottom of the outer tube. Furthermore, the gravity of the side clamping limiting structure is insufficient to cause the limiting spring to undergo elastic deformation.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The present invention uses multiple soft pads that are softly contacted along the side skirt of the vehicle body by the side clamping surface, and a set of injection pipes connected to the soft pads. During hoisting, hydraulic oil is flowed through the injection pipes to each soft pad to make it fill and expand. This not only improves the tightness and fit between the side clamping and the side skirt, but also avoids the wear caused by the direct binding of the straps to the side skirt surface, thus protecting the integrity of the side skirt coating and structure and reducing maintenance costs.

[0021] 2. This invention utilizes a design where the spiral groove on the inner wall of the driving liquid chamber engages with the protrusion on the side of the piston body. During lifting, the weight of the vehicle causes the piston body to rotate and move upward along the spiral groove, driving the outer tube to rotate within a 360-degree range. This achieves automatic repositioning of the lifted vehicle body, keeping it parallel to the carrier vehicle and significantly improving the convenience and efficiency of loading. Simultaneously, through the linkage between the internal angle sensor of the limit rod and the electric push rod and the support frame, the rotation angle of the lifting base can be detected in real time and converted into an electrical signal. This allows for precise control of the extension and retraction of the electric push rod to adjust the position of the support frame, ensuring that the piston body's range of motion matches the rotation angle of the side clamping limit structure. This guarantees the accuracy of the vehicle body's repositioning and avoids affecting the lifting effect due to angle deviations. Attached Figure Description

[0022] Figure 1This is a front view of the overall structure of the present invention;

[0023] Figure 2 This is a rear view of the overall structure of the present invention;

[0024] Figure 3 This is a radial cross-sectional view of the overall structure of the present invention along the outer tube.

[0025] Figure 4 This is a cross-sectional view of the overall structure of the present invention;

[0026] Figure 5 This is a cross-section of the swing structure of the present invention. Figure 1 ;

[0027] Figure 6 This is a cross-section of the swing structure of the present invention. Figure 2 ;

[0028] Figure 7 This is an exploded view of the swing structure of the present invention.

[0029] In the picture:

[0030] 1. Swing structure;

[0031] 11. Outer tube body; 111. Drive fluid chamber; 112. Piston body; 113. Limiting protrusion; 114. Spiral groove; 115. Return spring; 116. Hydraulic rod; 117. Electric actuator; 118. Support frame;

[0032] 12. Lifting connector; 121. Slewing sleeve; 122. Assembly base;

[0033] 13. Lifting base; 131. Limiting rod; 132. Limiting spring;

[0034] 2. Side clamp limiting structure;

[0035] 21. Suspension beam;

[0036] 22. Straps;

[0037] 23. Side clamp; 231. Soft pad bladder; 232. Injection tubing assembly;

[0038] 24. Container box; 241. Liquid storage tank; 242. Hydraulic spring; 243. Liquid return plate; 244. Rewinding roller. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see Figures 1 to 7 This invention provides a technical solution for a vehicle body side skirt limiting device and a vehicle body lifting device:

[0041] A vehicle body side skirt limiting device includes:

[0042] Side clamp limiting structure 2, two are set as a group (only one is shown in the figure), and are attached and bound to the side skirts of the crane truck during hoisting;

[0043] The two side clamping limiting structures 2 include a lifting beam 21, the length of which is greater than or equal to the length of the vehicle being lifted. Multiple lugs are integrally welded to both the upper and lower surfaces. These lugs are connected and bound to the lugs on the surface of the swing structure 1 and the strap 22 via steel wire ropes. After the strap 22 is bound to the wheel hub, a side clamping strap 23 is integrally sewn onto the side near the side skirt. Multiple soft pads 231 are integrally provided along the surface of the side skirt from top to bottom. An injection tube assembly 232 is provided on the side of the side clamping strap 23 that communicates with the soft pads 231, away from the vehicle body. The height of the side clamping strap 23 is greater than or equal to the height of the vehicle side skirt being lifted. One end of the side clamping strap 23 is wrapped and fixed inside the receiving box 24, within a receiving chamber located on the same side as the side clamping strap 23. The receiving chamber is equipped with a torsion plate similar to a measuring tape. The retractable and reset winding roller 244, the side of the receiving box 24 that contacts the body skirt has an insulating pad, and the side of the receiving box 24 has a window for the side clamp 23 to enter and exit the receiving chamber, and the size of the window matches the side clamp 23 of the pad 231 in the unfilled and expanded state, thereby using the window to restrict the hydraulic oil from continuing to enter the pad 231 inside the receiving chamber. The main body of the receiving box 24 protrudes downward from the side clamp 23, and a liquid storage tank 241 is provided inside the protruding part. At least one hydraulic spring 242 is elastically connected to the return plate 243 inside the liquid storage tank 241. The receiving box 24, with the interface connecting the bottom surface of the receiving box 241 to the inside of the liquid storage tank 241, is connected to the injection pipe assembly 232 through a pipeline. The injection pipe assembly 232 consists of multiple pipelines connected to the pad 231 and a main pipeline for rectifying these pipelines.

[0044] The two side clamping limiting structures 2 share a single lifting beam 21, while other structures are set up separately.

[0045] During lifting operations, when the piston body 112 moves relative to the support frame 118, it compresses the hydraulic oil between them. The pressurized hydraulic oil is distributed through pipelines to the injection pipe assembly 232, and then evenly delivered to each soft pad 231 through its branch pipelines to make it fill and expand, thereby increasing the fastening strength of the tie strap 22 to the rear clamp 23 and the side skirt of the car. Excess hydraulic oil is limited by the window of the receiving box 24 and flows into the reservoir 241 through pipelines, pushing the return plate 243 to compress the hydraulic spring 242, thereby achieving temporary storage and buffering.

[0046] In summary, by using multiple soft pads 231 that are softly contacted along the side skirt of the vehicle body by the side clamp 23 surface, and the liquid injection pipe group 232 that is connected to the soft pads 231, hydraulic oil is diverted to each soft pad 231 through the liquid injection pipe group 232 during hoisting, causing it to fill and expand. This not only improves the tightness and fit between the side clamp 23 and the side skirt, but also avoids the wear caused by the direct binding of the strap 22 to the side skirt surface through soft contact, thus protecting the side skirt coating and structural integrity and reducing maintenance costs.

[0047] A vehicle body lifting device, comprising:

[0048] The swing structure 1 has lifting lugs on both the upper and lower surfaces, and the upper lifting lug is connected and bound to the lifting equipment by a steel wire rope;

[0049] The swing structure 1 includes an outer tube 11, inside which is a vertically penetrating driving liquid chamber 111. A piston 112 is slidably and sealed within the lower part of the driving liquid chamber 111. Two symmetrically formed limiting protrusions 113 are integrally formed along the axis at the middle position of the side of the piston 112. During lifting, under the influence of the vehicle's weight, the piston 112, in conjunction with the limiting protrusions 113, rotates upward along a concave spiral groove 114 on the inner wall of the driving liquid chamber 111, thereby driving the outer tube 11 to rotate within a 360-degree range. A return spring 115 is sleeved on the rod of the piston 112, providing elastic restraint within the driving liquid chamber 111. The swing structure 1 and the side clamp... The weight of the limiting structure 2 is insufficient to cause the return spring 115 to undergo elastic deformation. An interface for circulating internally stored hydraulic oil is provided on the side of the outer tube 11 above the corresponding drive fluid chamber 111. This interface, along with a connecting pipe, is connected to the injection pipe assembly 232 of the two side clamp limiting structures 2, thereby achieving communication between the drive fluid chamber 111 and the soft pad 231. The upper end of the piston body 112 slides through the outer tube 11 and, after connecting with the mounting base 122, is bolted to the center of the bottom surface of the lifting connector 12. The lifting connector 12, with its integral upper surface lug, is connected to the lifting equipment via a wire rope. The bottom surface of the lifting connector 12, with its embedded bearing, is fitted with a rotating sleeve 121 via an upward thrust center insertion method. Furthermore, the lower annular surface of the rotating sleeve 121 is integrally connected to multiple passively telescopic hydraulic rods 116 via a mounting seat. The hydraulic rods 116 are inserted and positioned within an assembly groove located above the driving fluid chamber 111 inside the outer tube body 11. Multiple electric actuators 117 are inserted and positioned around the driving fluid chamber 111 from the lower part of the outer tube body 11. The output ends of these electric actuators 117 are all bolted to C-shaped abutments 118. The abutments 118 are slidably constrained within a groove communicating with the inner wall of the driving fluid chamber 111 inside the outer tube body 11. One end of the abutment 118 inside the driving fluid chamber 111 cooperates with an annular plate sleeved on the piston rod of the piston body 112 to constrain the range of motion of the piston end of the piston body 112. The bottom of the device has stepped grooves, and a limiting spring 132 inside the grooves slides and constrains the limiting rod 131. The lower end of the limiting rod 131 passes through the prism hole at the bottom of the outer tube 11 and is integrally connected to the lifting base 13. The bottom surface of the lifting base 13 has multiple integral lugs, which are connected and bound to two lifting beams 21 by steel wire ropes. The limiting rod 131 consists of an end plate that slides along its groove, a prism connected to the end plate, and a cylinder with a radius smaller than the prism connected to the lower end of the prism. Preferably, the surface of the end plate that contacts the limiting spring 132 is a combination of the rotating sleeve 121 and the lifting connector 12. The cylinder is connected to the lifting base 13, and initially, the cylinder is movably located inside the prism hole at the bottom of the outer tube 11.Furthermore, the gravity of the side clamping limiting structure 2 is insufficient to cause elastic deformation of the limiting spring 132. The limiting rod 131 contains an angle sensor that detects the rotation of the lifting base 13. This angle sensor transmits the detected angle signal to the electric actuator 117 via a circuit, thereby matching the rotation angle of the lifting base 13 with the output length of the electric actuator 117. This, in conjunction with the abutment 118, adjusts the piston body 112 along the spiral groove 114 to the same angle.

[0050] During operation, after the transport vehicle is moved to the designated position, the lifting equipment is operated and the side clamping limiting structure 2 is guided to be directly above the vehicle. The side clamping limiting structure 2 is manually driven to rotate so that the two sets of side clamping limiting structures 2 correspond to the two sides of the vehicle's side skirt. During rotation, the side clamping limiting structure 2 drags the lifting base 13 to rotate synchronously via steel wire ropes. An angle sensor inside the lifting base 13 detects the rotation angle in real time and transmits a signal to the controller. The controller calculates the required extension / retraction of the electric push rod 117 and sends a command to drive the abutment frame 118 to slide along the groove of the outer tube 11. This achieves matching adjustment of the abutment frame 118 with the piston body 112 along the moving range of the spiral groove 114, ensuring a complete fit of the rotation angle. After angle matching, the side is deployed. The clamping and limiting structure 2 is moved to the corresponding position, and the strap 22 is tied to the car wheel hub. The side clamping strap 23 is attached to the car body skirt under the action of the winding roller 244 torsion and reset structure. The length is locked by the tape measure structure. When the lifting equipment is started for hoisting, the lifting connector 12 pulls the hydraulic rod 116 and the piston body 112. The lifting base 13 is pulled by gravity to the limiting rod 131 to compress the limiting spring 132, realizing rotation locking. The outer tube 11 engages with the limiting protrusion 113 through the spiral groove 114 and rotates stably along the piston body 112. When the piston body 112 moves to the abutment 118 position, the car is straightened, so that the car and the carrier are kept parallel, improving the convenience of loading.

[0051] In summary, by using the spiral groove 114 on the inner wall of the driving liquid chamber 111 to cooperate with the limiting protrusion 113 on the side of the piston body 112, the weight of the vehicle body during lifting drives the piston body 112 to rotate and move upward along the spiral groove 114, driving the outer tube body 11 to rotate within a 360-degree range, thereby achieving automatic return of the lifted vehicle body to its original position and keeping the vehicle body parallel to the carrier vehicle, which greatly improves the convenience and efficiency of vehicle loading. At the same time, by using the internal angle sensor of the limit rod 131 to link with the electric push rod 117 and the abutment 118, the rotation angle of the lifting base 13 can be detected in real time and converted into an electrical signal, which precisely controls the extension and retraction of the electric push rod 117 to adjust the position of the abutment 118, so that the range of motion of the piston body 112 matches the rotation angle of the side clamping limit structure 2, ensuring the accuracy of vehicle body return to its original position and avoiding the impact of angle deviation on the lifting effect.

[0052] Working Principle: During operation, the transport vehicle is first moved to the designated position of the car to be lifted. The operator controls the lifting equipment while manually guiding the side clamping and limiting structures 2 to move directly above the car. Then, the operator manually drives the side clamping and limiting structures 2 to rotate, positioning them on either side of the car's side skirt. During this rotation, the side clamping and limiting structures 2 synchronously drag the lifting base 13 under gravity via steel cables, keeping the lifting base 13 and the side clamping and limiting structures 2 rotating at the same angle until the rotation angle of the side clamping and limiting structures 2 is parallel to the direction of the car body. Throughout this process, the angle sensor inside the lifting base 13 (such as an Osram AS5600, KTH7824, or MT6835) monitors the angle in real time. The rotation angle is detected and converted into an electrical signal, which is then transmitted to the controller. The controller compares this signal with preset angle parameters and calculates the required extension / retraction amount of the electric actuator 117 (such as the Thomson Electrorak XD series, LINAKLA37, etc.). Subsequently, a control command is sent to the electric actuator 117, which drives the C-shaped abutment 118 connected to its output end to slide along the groove inside the outer tube 11. This achieves matching adjustment of the abutment 118 with the piston body 112 within the spiral groove 114's movement range. For example, when the side clamping limit structure 2 causes the lifting base 13 to rotate at a small angle, the distance by which the electric actuator 117 pushes the abutment 118 upwards decreases synchronously, ensuring that the piston body 112 rotates and moves along the spiral groove 114 in conjunction with the limiting protrusion 113. The angle is perfectly matched with the rotation angle of the lifting base 13. After the angle matching is completed, the lifting equipment is manually controlled to deploy the side clamp limiting structure 2 to the corresponding position of the car side skirt, and the strap 22 is firmly bound to the car wheel hub. At this time, the side clamp 23 is tightly attached to the surface of the car side skirt under the action of the winding roller 244 inside the housing box 24, which has a torsion and reset structure similar to a measuring tape. Then, the output length of the side clamp 23 is locked by the measuring tape-type extension positioning structure. At this time, the multiple soft pads 231 on the surface of the side clamp 23 are in a loose and thin state without liquid filling. Then, the lifting equipment is started to lift the car. During the lifting process, the crane lifts the lifting connector 12 upward. Under the action of the weight of the car being lifted, the lifting connector 12 passes through the mounting seat 122 and the rotating sleeve 12. 1. Simultaneously, the hydraulic rod 116 and piston body 112 are lifted. At the same time, the lifting base 13, due to the weight of the vehicle, pulls the limiting rod 131 downward, generating a compressive force on the limiting spring 132. This causes the prism part of the limiting rod 131 to fully insert into the prism hole at the bottom of the outer tube 11, achieving rotational locking of the lifting base 13. When the outer tube 11 and lifting base 13 are subjected to the downward force of the vehicle's weight, the outer tube 11, under the movement constraint of the passively stretched hydraulic rod 116, achieves stable helical rotation of the piston body 112 in a vertical state through the meshing of the spiral groove 114 on the inner wall of the drive chamber 111 and the limiting protrusion 113 on the surface of the piston body 112. When the piston body 112 moves to the position of the support frame 118, the return of the hoisted vehicle is completed.This design ensures the crane truck and the carrier truck remain parallel, significantly improving the ease of loading the truck into the carrier truck. Simultaneously, when the piston body 112 and the support frame 118 move relative to each other, they compress the hydraulic oil between them. The pressurized hydraulic oil is then distributed through pipelines to the injection pipe assembly 232, and then evenly distributed to each soft pad 231 via branch pipes of the injection pipe assembly 232. This causes the soft pad 231 to inflate and expand, thereby increasing the fastening strength between the side clamp 23 and the car side skirt after the strap 22 is secured. If there is excess hydraulic oil, it will flow into the reservoir 241 through pipelines due to the limiting effect of the window of the receiving box 24, pushing the return plate 243 to compress the hydraulic spring 242, achieving temporary storage and buffering of the hydraulic oil. The fastening strength between the side clamp 23 and the car side skirt is positively correlated with the rotation angle when the side clamp limiting structure 2 is used to secure the truck, the length of the truck itself, and its weight. The larger the rotation angle required for securing the truck, the stronger the fastening strength between the side clamp 23 and the car side skirt. The longer the vehicle or the greater its weight, the greater the rotation angle when the vehicle returns to center via the swing structure 1. This places higher demands on the strength of the side skirts' limiting protection, and the expansion degree of the soft pad 231 is correspondingly increased. After the lifting equipment lifts the vehicle to the designated area on the carrier, the lifting equipment releases the lifting state, and each structure resets under the coordinated action of the internal springs. Specifically, the reset spring 115 pushes the piston body 112 back to its initial position, the limit spring 132 drives the limit rod 131 to reset, releasing the rotation lock of the lifting base 13, the hydraulic spring 242 in the reservoir 241 pushes the return plate 243 to push the stored hydraulic oil back to the drive chamber 111, the soft pad 231 depressurizes and contracts, and the winding roller 244, under the action of the torsional reset force, retracts the side clamp 23 into the receiving box 24. The entire device returns to its initial state for the next lifting operation, and then the vehicle transfer operation can be carried out.

[0053] It should be noted that the automatic winding and extension positioning structure of the measuring tape includes a roller, a spring, and a positioning component that engages with a ratchet and a pawl, all installed inside the measuring tape housing. One end of the spring is fixed to the roller shaft, and the other end is connected to the inner wall of the housing. The ratchet is coaxially sleeved on the outside of the roller. The pawl is hinged inside the housing via an elastic element and is adapted to the ratchet tooth groove. When extending the tape, an external force pulls the measuring tape, causing the roller to rotate against the spring force and simultaneously drive the ratchet to rotate. Under the action of the elastic element, the pawl engages with the ratchet tooth groove, achieving stable positioning of the extended measuring tape and preventing it from retracting on its own. When winding is required, pressing the unlock button drives the pawl to disengage from the ratchet tooth groove, and the spring releases its elastic potential energy, causing the roller to rotate in the opposite direction, automatically winding the measuring tape onto the roller and completing the winding action.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vehicle body side skirt limiting device, characterized in that, include: Side clamp limiting structure (2), two are set as a group, and are attached and bound to the side skirts of the hoisting vehicle during hoisting; The side clamp limiting structure (2) includes a side clamp (23). The surface of the side clamp (23) is integrally provided with multiple soft pads (231) from top to bottom along the surface of the vehicle body skirt. The side clamp (23) is provided with an injection tube assembly (232) on the side away from the vehicle body and in communication with the soft pads (231).

2. The vehicle body skirt limiting device according to claim 1, characterized in that: The side clamp limiting structure (2) also includes a lifting beam (21). The length of the lifting beam (21) is greater than or equal to the length of the vehicle being lifted. Multiple hanging ears are integrally welded on the upper and lower surfaces. The hanging ears on the upper and lower sides are connected and bound to the hanging ears and straps (22) on the surface of the swing structure (1) by steel wire ropes respectively. After the straps (22) are bound to the wheel hub, the side clamp strap (23) is integrally sewn to the side of the strap (22) near the skirt.

3. The vehicle body skirt limiting device according to claim 1, characterized in that: One end of the side clamp (23) is wound and fixed inside the receiving box (24) to the receiving chamber on the same side as the side clamp (23). The receiving chamber is provided with a winding roller (244) that is similar to a measuring tape and can be twisted and reset. The main body of the receiving box (24) protrudes downward from the side clamp (23). A liquid storage tank (241) is provided inside the protruding part. At least one hydraulic spring (242) is elastically connected to the return plate (243) inside the liquid storage tank (241). The receiving box (24) is connected to the injection tube assembly (232) through a pipe through an interface that connects the bottom surface of the receiving box (241) to the inside of the liquid storage tank (241). The injection tube assembly (232) consists of multiple pipes that connect to the soft pad (231) and a main pipe that rectifies these pipes.

4. A vehicle body lifting device, characterized in that, The vehicle body side skirt limiting device according to any one of claims 1-3 includes: The swing structure (1) has lifting lugs on both the upper and lower surfaces, and the upper lifting lugs are connected and bound to the lifting equipment by steel wire ropes; The swing structure (1) includes an outer tube (11), which has a driving liquid chamber (111) that runs vertically through it. A piston body (112) is slidably sealed to the lower part of the driving liquid chamber (111). Two limiting protrusions (113) are integrally formed symmetrically along the axis at the middle position of the side of the piston body (112). During the lifting process, under the action of the vehicle's weight, the piston body (112) will rotate and move upward along a spiral groove (114) formed by a concave in the inner wall of the driving liquid chamber (111) in conjunction with the limiting protrusions (113). The upper end of the piston body (112) slides through the outer tube (11) and is connected to the center of the bottom surface of the lifting connector (12) by bolts to the mounting base (122). Multiple electric push rods (117) are inserted and positioned inside the lower part of the outer tube (11) on the periphery of the driving liquid chamber (111). The output ends of (117) are all connected to C-shaped abutments (118) by bolts. The abutments (118) are slidably constrained in the groove inside the outer tube (11) and the inner wall of the driving liquid chamber (111). The end of the abutment (118) inside the driving liquid chamber (111) is fitted with a ring plate on the piston rod of the piston body (112) to constrain the range of motion of the piston end of the piston body (112). The bottom of the outer tube (11) has stepped holes and grooves. The limiting spring (132) is fitted inside the holes and grooves to slide and constrain the limiting rod (131). The lower end of the limiting rod (131) passes through the prism hole at the bottom of the outer tube (11) and is integrally connected to the lifting base (13). The inside of the limiting rod (131) has an angle sensor for rotating the lifting base (13). The angle sensor transmits the detected angle signal to the electric push rod (117) through a line.

5. A vehicle body lifting device according to claim 4, characterized in that: A return spring (115) is sleeved on the rod of the piston body (112), and the return spring (115) provides elastic constraint inside the drive fluid chamber (111). The gravity of the swing structure (1) and the side clamp limiting structure (2) is insufficient to cause the return spring (115) to undergo elastic deformation.

6. A vehicle body lifting device according to claim 4, characterized in that: The outer tube (11) has an interface for circulating internally stored hydraulic oil located above the corresponding drive fluid chamber (111) on its side. The interface is connected to the injection pipe assembly (232) through a pipeline, thereby enabling communication between the drive fluid chamber (111) and the soft pad bladder (231).

7. A vehicle body lifting device according to claim 4, characterized in that: The lifting connector (12) is connected to the lifting equipment via a steel wire rope through a lug on its upper surface.

8. A vehicle body lifting device according to claim 4, characterized in that: The bottom surface of the lifting connector (12) is fitted with an embedded bearing and a rotating sleeve (121) is rotated and constrained by inserting the upper push center. The lower ring surface of the rotating sleeve (121) is connected to multiple passively telescopic hydraulic rods (116) through a mounting seat. The hydraulic rods (116) are inserted and positioned in the assembly groove set above the drive fluid chamber (111) inside the outer tube body (11).

9. A vehicle body lifting device according to claim 4, characterized in that: The bottom surface of the lifting base (13) has multiple integrated lugs, and the lugs are connected and bound to two lifting beams (21) by steel wire rope. The lifting beam (21) consists of an end plate that slides along its slot, a prism connected to the end plate, and a cylinder with a radius smaller than the prism connected to the lower end of the prism. The cylinder is connected to the lifting base (13), and initially, the cylinder is movably located in the prism hole at the bottom of the outer tube (11), and the gravity of the side clamping limiting structure (2) is insufficient to cause the limiting spring (132) to undergo elastic deformation.

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