A tarpaulin winding and unwinding device and a carriage with tarpaulin side winding and unwinding

Abstract

The application discloses a drum-type tarpaulin winding and unwinding device and a tarpaulin side winding and unwinding carriage, and belongs to the technical field of covering equipment of freight vehicles. The device comprises a tarpaulin winding and unwinding unit, a swing arm unit, a winding power assembly, a stretching and returning unit and a controller for overall machine control. The tarpaulin winding and unwinding unit comprises a drum and a tarpaulin. One side of the tarpaulin is fixed and wound on the drum, and the other side of the tarpaulin is provided with a hanging assembly. The hanging assembly is hung on one side of a space to be covered. The swing arm unit comprises a driving swing arm and a driven swing arm which are oppositely arranged. The driving swing arm and the driven swing arm are oppositely provided with a hole seat at one end. The drum-type tarpaulin winding and unwinding device and the tarpaulin side winding and unwinding carriage can completely avoid the overturning space of a side rail and realize the tarpaulin side winding and unwinding. Meanwhile, the stretching and returning unit provides returning power and over-the-top damping, and the drum is secondarily tensioned to ensure that the tarpaulin completely covers the space to be covered.

Description

Technical Field

[0001] This invention specifically relates to a roll-type tarpaulin retraction device and a tarpaulin side-retraction compartment, belonging to the technical field of freight vehicle covering equipment. Background Technology

[0002] When dump trucks and self-dumping trucks transport bulk materials on highways, the top of the cargo box must be covered with a tarpaulin to prevent material spillage and dust generation, and to meet environmental compliance requirements. In existing technologies, mainstream products such as top-rolling tarpaulins and push-pull folding tarpaulins, such as the self-locking tarpaulin covering device for a tractor unit disclosed in Chinese Patent Publication No. CN122232526A and its working method, include: a linear rack extending along the length of the cargo box frame, with two racks symmetrically arranged; a guide rail extending along the length of the cargo box frame and located below the linear racks; an unfolding assembly located on the side of the cargo box frame near the rear, with its movable end slidably mounted on the guide rail; and a rewinding assembly. The component extends along the width of the cargo box frame and is fixed to the movable end of the unfolding component by a bracket, and matches the linear rack; one end of the tarpaulin is fixed to the end wall of the cargo box frame, and the other end is wound onto the retracting component; the existing covering structure, whether it is its swing arm or guide rail, needs to be installed on the upper edge of the left and right side panels of the cargo box, which directly causes the side panels to be blocked by the mechanism and cannot be fully flipped outward to open. Loading and unloading operations can only be carried out from the rear, which cannot meet the working conditions of side loading and unloading, and the operation flexibility is poor; in addition, some small vehicles use manual pulling of the tarpaulin for covering, which is labor-intensive, and the operators need to climb to the top of the cargo box, which is more than two meters high, which is a high-altitude operation, with a risk of falling and extremely low operation efficiency. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes a roll-type tarpaulin retraction device and a carriage for side-mounted tarpaulin retraction, which completely avoids the flipping space of the side panels and enables side-mounted tarpaulin retraction. Simultaneously, a tension return unit provides return power and over-the-top damping, and secondary tensioning through the positioning of the rollers ensures that the tarpaulin completely covers the space to be covered.

[0004] The roll-type tarpaulin take-up and take-down device of the present invention includes: A tarpaulin deployment unit includes a roller and a tarpaulin. One side of the tarpaulin is fixed and wound around the roller, and the other side of the tarpaulin is provided with a hanging assembly. The hanging assembly is attached to one side of the space to be covered. The swing arm unit includes an active swing arm and a driven swing arm facing each other. One end of each swing arm has a hole seat facing each other, and a bearing assembly is fitted and fixed inside the hole seat. A shaft with a shoulder is rolled inside the bearing assembly, and a support body is fixed at the end of the shaft away from the bearing assembly. The lower ends of the active and driven swing arms cooperate with the shaft via the bearing assembly, and the end of the shaft is connected to the support body. The support body is fixed at the middle of the front and rear end faces of the space to be covered, forming a longitudinal rotation axis. A shaft seat is fixed at the other end of each swing arm and driven swing arm. Both ends of the roller are rotatably mounted to the shaft seat via the bearing body. The support body is fixed at the middle of the two opposite sides of the space to be covered. A winding power assembly is fixed to the outside of the shaft seat. The winding power assembly includes a drive motor with a power failure brake. The output shaft of the drive motor is connected to the input shaft of the reducer. The reducer is fixed to one end of the drum. The fabric includes two sets of tension return units, each consisting of a tension spring or a coil spring. One end of each set is connected to the lower part of the active and driven swing arms via an ear mount. The other end of each set is connected to the opposite side of the space to be covered via an ear mount. The connection assembly and the installation positions of the tension return units are located on the other two opposite sides of the space to be covered. During winding, the motor pulls the swing arm unit to swing towards the winding side, and the tension spring is stretched to store energy. During unwinding, the tension spring contracts to release energy, pushing the swing arm unit to rise past the apex. After passing the apex, during the downward swing phase due to its own weight, the tangential component of the tension spring force reverses to form damping, counteracting the downward acceleration. The swing arm positioning proximity switch is located at the end of the stroke on both sides of the swing arm unit and fixed to the outer side of the space to be covered. The controller controls the entire machine, and the winding power assembly is connected to the controller. The controller is wirelessly connected to a remote control terminal. Ground operations are performed through the remote control terminal to retract or cover the tarpaulin.

[0005] Furthermore, it also includes a locking pin and a U-shaped electronic lock seat. The locking pin is fixed to the lower part of the active and driven swing arms near the hanging assembly. The electronic lock seat is fixed to the opposite side of the space to be covered and is located on the side of the swing arm unit away from the hanging assembly. After the tarpaulin covers the space to be covered, the locking pin engages inside the electronic lock seat. When the tarpaulin is fully unfolded, the locking pin automatically engages inside the electronic lock seat, and the locking pin of the electronic lock seat extends into the slot. At this time, the locking pins limit each other, achieving rigid locking of the swing arm unit to resist vehicle bumps and wind resistance. At the same time, it provides tension for the subsequent tarpaulin winding unit to wind the tarpaulin. That is, after the tarpaulin is fully unfolded, the controller controls the power-off brake to remain in the released state, and the drive motor drives the roller to rotate in the winding direction at a set angle with a set small torque to compensate for the tension of the tarpaulin. Then, the power-off brake cuts off the power and locks the roller's rotational freedom.

[0006] Furthermore, it also includes a tarpaulin covering speed control unit, which is a tension spring or a side proximity switch; one end of the tension spring is connected to the outside of the space to be covered, and the other end of the tension spring is connected to the middle of the swing arm unit near the space to be covered; when the swing arm unit is perpendicular to the ground, the swing arm unit is parallel to the tension spring, and when the swing arm unit rotates away from the side of the hanging component and exceeds the highest point of the rotation path, the side proximity switch is triggered; when the side proximity switch is used as the tarpaulin covering speed control unit, the side proximity switch monitors whether the swing arm unit (at least one of the active swing arm and the driven swing arm) has rotated past the apex of the path, and when it is confirmed to be in the tarpaulin-releasing state (drive motor stops, loss of control)... When the electric brake is energized and the side proximity switch is triggered, the drive motor starts and reverses to release the tarpaulin at a low speed. By using the tarpaulin to pull the tarpaulin out, the tarpaulin can be released at a uniform speed to cover the vehicle body. The tension spring provides secondary damping, making the tarpaulin coverage more stable. When the tension spring is used as the tarpaulin covering speed control unit, the tension return unit drives the swing arm unit to move, causing the tarpaulin to cover the vehicle body. When the swing arm unit rotates beyond the highest point of the rotation path, the tension spring deviates from the axis of the swing arm unit (at least one of the active swing arm and the driven swing arm). As the axis continues to deviate, the tension spring continues to pull the swing arm unit, continuously providing damping for the tarpaulin coverage, making the coverage more stable.

[0007] Furthermore, it also includes a swing arm positioning proximity switch, which is located at the end of the travel on both sides of the swing arm unit and fixed to the outer side of the space to be covered; when the swing arm unit rotates to the rewind position or the covering position, the swing arm positioning proximity switch is triggered, and the controller determines that the tarpaulin is rewind in place.

[0008] Furthermore, baffles are fixed at both ends of the roller, and the two sides of the tarpaulin are attached to the inner edge of the baffles. The baffles can prevent the tarpaulin from detaching from the ends of the roller during the unfolding and retraction process.

[0009] Furthermore, the shaft shoulder of the shaft body is pressed against one end of the inner ring of the bearing assembly, and an end cap is pressed against the other end of the inner ring of the bearing assembly. The end cap is fixed to the end of the shaft body by bolts. Through the cooperation between the end cap and the shaft shoulder of the shaft body, one end of the shaft body can be clamped between the inner rings of the bearing assembly.

[0010] Furthermore, the hanging component is a row of hooks, straps, or buckles that are attached to the side of the space to be covered. The hooks, straps, or buckles are used as connectors to tie and lock one side of the tarpaulin to the side of the space to be covered.

[0011] A tarpaulin-style cargo compartment with side retraction includes a roll-up tarpaulin retraction device. The space to be covered is the cargo compartment (cargo bed). The active swing arm is mounted on the middle of the side of the cargo compartment near the front of the vehicle via a support body, and the driven swing arm is mounted on the middle of the side of the cargo compartment near the rear of the vehicle via a support body, without occupying any side space. In the retracted state, the entire mechanism falls back to the side edge of the cargo compartment, and the side panel can be fully opened to support side loading and unloading.

[0012] Furthermore, when the tailgate of the vehicle body is an upward-opening structure, the driven swing arm is installed on the top of the vehicle body through the support body; when the tailgate of the vehicle body is a downward-opening structure, the driven swing arm is installed on the bottom of the vehicle body through the support body. This installation method can prevent the tailgate from hitting the retraction device when it is opened.

[0013] Furthermore, the mounting assembly is attached to the outside of one long side of the vehicle body, and after the electronic lock seat is locked with the locking pin, the roller overlaps the outside of the other long side of the vehicle body; this allows the tarpaulin to fully cover the top surface of the vehicle body, ensuring the tightness of the vehicle body coverage.

[0014] Compared with the prior art, the roll-type tarpaulin retraction device and the tarpaulin side retraction carriage of the present invention have the following advantages; 1. Strong operational compatibility, the truck bed can be unloaded from the side: The swing arm unit is installed on the front and rear ends of the truck bed. The extension and retraction are completed along the end plane, without intruding on the side space. After being retracted, it completely avoids the side panel flipping trajectory. The side panel can be fully opened outward, supporting forklifts and excavators to load and unload goods from the side.

[0015] 2. The tension return unit provides return power and downward damping: The tension spring simultaneously bears the return power of the fabric and the over-the-top damping buffer. Without the need for additional dampers, it can offset the acceleration of the downward swing due to its own weight, eliminate the rigid impact when in place, reduce structural wear and noise, and significantly improve the service life of the whole machine.

[0016] 3. Tight coverage and long-lasting tension: After the covering is in place, the locking pin and electronic lock seat work together to lock the swing arm unit, and the drive motor achieves secondary winding tension to eliminate slack in the tarpaulin. With the help of the power failure brake, it is not easy to shrink or leak material in the long term. It has excellent wind and bump resistance.

[0017] 4. Safe and efficient operation: Equipped with a remote control terminal, operators can complete all deployment and retrieval operations from the ground without climbing the carriage, eliminating the risk of falling from heights. A single person can complete the operation in a short time, which is far more efficient than manually covering the tarpaulin.

[0018] 5. More stable and safer tarpaulin deployment: During tarpaulin deployment, whether it is electronically controlled low-speed traction or spring-damped speed limiting, the self-weight acceleration effect after the swing arm passes overhead can be effectively offset, completely solving the defect of the self-weight swing speed gradually increasing in stages; the tarpaulin maintains constant tension throughout the deployment process, avoiding problems such as loose stacking, wrinkles, skewing, and wind catching on the fabric surface. After being laid out, the fabric surface is flat and close-fitting, and the sealing tightness of the sides and ends is greatly improved; and through uniform tarpaulin deployment or damping buffer structure, the rigid impact force of the swing arm in place is greatly reduced, avoiding loosening, deformation, and wear of the supports, bearings, and hinges caused by long-term impact, while reducing the impact noise in place, making it more suitable for the bumpy and heavy-load working conditions of dump trucks. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the roll-type tarpaulin take-up and take-down device of the present invention.

[0020] Figure 2 This is a partial structural diagram of one end of the active swing arm of the present invention.

[0021] Figure 3 This is a partial structural diagram of the other end of the active swing arm of the present invention.

[0022] Figure 4 This is a schematic diagram of the retracted state of the roll-type tarpaulin retraction device of the present invention.

[0023] Figure 5 This is a schematic diagram of the unfolded state of the roll-type tarpaulin unfolding device of the present invention.

[0024] Figure 6 This is a schematic diagram of the installation structure of the roll-type tarpaulin take-up and take-down device, the locking pin, and the electronic lock seat of the present invention.

[0025] Figure 7 This is a schematic diagram of the active swing arm of the roll-type tarpaulin retraction device of the present invention switching between the retracted position, the top position, and the unfolded position.

[0026] Figure 8 This is a schematic diagram of an embodiment of the roll-type tarpaulin take-up and take-down device and the tarpaulin covering speed control unit of the present invention.

[0027] Figure 9 This is a schematic diagram of another embodiment of the installation of the roll-type tarpaulin take-up and take-down device and the tarpaulin covering speed control unit of the present invention.

[0028] Reference numerals: 1. Roller, 2. Tarpaulin, 3. Active swing arm, 4. Driven swing arm, 5. Bearing assembly, 6. Shaft, 7. End cover, 8. Support body, 9. Shaft seat, 10. Bearing body, 11. Drive motor, 12. Reducer, 13. Tension spring, 14. Ear seat, 15. Locking pin, 16. Electronic lock seat, 17. Side proximity switch, 18. Tension spring, 19. Carriage body. Detailed Implementation

[0029] Example 1: like Figures 1 to 9 The roll-type tarpaulin take-up and take-down device shown can be adapted to the automated take-up and take-down of rectangular spaces to be covered, and is especially suitable for cargo beds of freight vehicles. The tarpaulin winding unit includes a roller 1 and a tarpaulin 2. The roller 1 is made of high-strength seamless steel pipe, and its length matches the longitudinal length of the space to be covered. The tarpaulin 2 is made of PVC-coated wear-resistant and rainproof cloth. One long side of the tarpaulin 2 is fastened to the groove on the outer wall of the roller 1 by a pressure strip and bolts, and is wound layer by layer around the roller 1. The other long side of the tarpaulin 2 is equipped with a hook assembly, which uses a row of galvanized hooks evenly spaced. When in use, the hooks are attached to the matching hanging rings on the opposite side of the space to be covered, so as to quickly fix and tension the movable side of the tarpaulin 2. Circular baffles are coaxially fixed at both ends of the roller 1. The diameter of the baffles is larger than the maximum outer diameter of the tarpaulin 2 when it is wound. The two long edges of the tarpaulin 2 are attached to the inner end face of the baffles. During the winding process, the axial movement of the tarpaulin 2 is restricted, ensuring that the layers are wound neatly and avoiding skewing or unwinding. The swing arm unit includes a driving swing arm 3 and a driven swing arm 4 arranged parallel to each other. Both are made of high-strength steel, with symmetrical structure and consistent length. The lower ends of both the driving and driven swing arms 3 and 4 are provided with circular seat holes. A deep groove ball bearing assembly 5 is interference-fitted and fixed to the inner wall of the seat hole. The inner ring of the bearing assembly 5 is rolled with a shaft 6 with a shoulder. The shoulder of the shaft 6 faces the inside of the swing arm unit, and the end face of the shoulder presses against the inner end face of the inner ring of the bearing assembly 5 for positioning. A circular end cap 7 is pressed against the outer end face of the inner ring of the bearing assembly 5. The end cap 7 is connected via... Bolts are fastened to the end of the shaft 6 to lock the shaft 6 and bearing assembly 5 axially, preventing the bearing assembly 5 from moving axially when the swing arm unit swings; a support body 8 is fixed to the end of the shaft 6 away from the bearing assembly 5. The support body 8 is a flange plate structure with mounting holes, used to fix the entire swing arm unit to the end face of the space to be covered; the upper ends of the active swing arm 3 and the driven swing arm 4 are both fixed with bearing seats 9, and bearing bodies 10 are embedded in the bearing seats 9; the shaft ends at both ends of the roller 1 are respectively inserted into the bearing bodies 10 on the corresponding sides, so as to realize the free rotation of the roller 1 around its own axis; The winding power assembly is bolted to the outside of the bearing seat 9 at the upper end of the active swing arm 3, including a drive motor 11 with a power failure brake and a reducer 12. The drive motor 11 is a DC geared motor with a normally closed power failure brake. When the power is off, the spring presses the friction plate to automatically lock the output shaft. The output shaft of the drive motor 11 is connected to the input shaft of the reducer 12, and the output shaft of the reducer 12 is coaxially connected to the front end of the roller 1 through a flat key. During the fabric winding operation, the drive motor 11 is powered on and rotates. After being reduced in speed and torque by the reducer 12, it drives the roller 1 to rotate in the winding direction, winding the tarpaulin 2 layer by layer onto the roller 1. During the fabric unwinding operation, the drive motor 11 is powered off, and the power failure brake is de-energized and disengaged (or a clutch is set between the drive motor 11 and the reducer 12, and the clutch is de-energized). The roller 1 is in a free-rotating state and can be passively released from the tarpaulin 2 under the action of external force. Two sets of tension return units are provided, corresponding to the active swing arm 3 and the driven swing arm 4 respectively, and tension springs 13 are used as energy storage return elements. One end of each tension return unit is hung on the lower part of the corresponding active swing arm 3 or driven swing arm 4 via an ear seat 14, and the other end is hung on a fixed point on the unfolded side of the space to be covered via an ear seat 14. The mounting side of the hanging component and the mounting side of the tension return unit are adjacent to the space to be covered, and the ear seat 14 is located away from the tension return unit. The fixed hanging point of the tension spring 13 is located below the unfolded side of the swing arm unit's rotation axis. The arrangement of the hanging point position makes... The swing arm unit meets the following characteristics throughout its entire stroke: During winding, the roller 1 pulls the swing arm unit from the unfolded position to the retracted side, and the tension spring 13 is gradually stretched, continuously accumulating elastic potential energy; During unwinding, the tension spring 13 contracts and releases energy, and the tangential component of the tension force pushes the swing arm unit from the retracted position to the top, overcoming the weight of the swing arm unit to complete the over-the-top action; When the swing arm unit swings down from the top to the unfolded position, the tangential component of the tension spring 13 is opposite to the direction of the downward swing, forming reverse damping, and the larger the downward swing angle, the stronger the damping torque, continuously offsetting the downward swing acceleration generated by its own weight, avoiding rigid impact upon arrival.

[0030] The controller is fixed inside the protective box. The drive motor 11 of the winding power assembly and the power failure brake (or clutch) are connected to the controller. The controller has a built-in wireless communication module that connects wirelessly to the remote control terminal. The effective control distance meets the ground operation requirements. The operator can send winding and unwinding instructions remotely through the remote control terminal. A swing arm positioning proximity switch is fixed on both the winding side and the unfolding side of the space to be covered and connected to the controller. It is used to detect the working status of the swing arm and trigger the motor to stop, lock, and perform other actions. It also includes a locking pin 15 and a U-shaped electronic lock seat 16. The locking pin 15 is a cylindrical pin, which is fixed to the lower part of the active swing arm 3 and the driven swing arm 4 on the side away from the hanging component. The electronic lock seat 16 is fixed to the edge of the unfolded side of the space to be covered, and its position corresponds to the locking pin 15. After the swing arm unit is unfolded into place, the locking pin 15 is engaged in the U-shaped groove of the electronic lock seat 16. After the electronic lock seat 16 is powered on, the lock tongue pops out, preventing the locking pin 15 from falling out, thereby achieving rigid locking of the swing arm unit and completely offsetting the swaying force caused by driving bumps and wind resistance.

[0031] The specific working process of the roll-type tarpaulin deployment and retraction device in this embodiment is as follows: Fabric covering process: The operator presses the fabric covering button on the remote terminal on the ground. After receiving the command, the controller first unlocks the electronic lock seat 16 and simultaneously energizes the de-energized brake of the drive motor 11 to release it. The roller 1 loses its self-rotation locking force and enters a state where it can rotate freely. In the retracted state, the tension spring 13 is in the maximum tension and energy storage state, releasing elastic potential energy to pull the swing arm to rotate around the bottom axis 6 and swing upwards towards the unfolded side, lifting the roller 1 and the tarpaulin 2 together to the highest point of the space to be covered. During this stage, the tangential component of the tension spring 13 is in the same direction as the upward movement of the swing arm unit, making every effort to overcome the rotational resistance of the swing arm unit and smoothly pushing the swing arm unit to the top position. When the center of gravity of the swing arm unit passes the highest point directly above the rotation axis, the gravity component becomes the downward swing driving force, and the swing arm carries the roller 1 to automatically swing downwards towards the unfolded side. The roller 1 simultaneously passively rotates to release the tarpaulin 2. During this process, the tangential component of the tension spring 13 is opposite to the downward swing direction, forming a continuous damping limit. The damping torque increases synchronously with the swing angle, counteracting the acceleration due to gravity and preventing the swing arm from swinging faster and faster. The swing speed remains stable throughout the entire swing, and the tarpaulin 2 is always taut, preventing loosening and stacking, and there is no rigid impact noise when it reaches the final position. When the swing arm unit swings to the unfolded position, the swing arm positioning proximity switch on the unfolded side triggers the positioning signal. The controller first controls the brake to maintain the energized and released state. Then, the drive motor 11 starts at a set low speed and low torque, driving the roller 1 in the winding direction. Make a small-angle rotation to pull the entire tarpaulin 2 towards the winding side, eliminating the slack caused by the tarpaulin 2's own weight sagging and assembly gaps, ensuring that the tarpaulin 2 fully fits the top of the space to be covered and the sides are tightly sealed; after the tensioning action is completed, the controller controls the brake to de-energize and lock, the motor is simultaneously de-energized, and the rotational freedom of the roller 1 is completely locked; at the same time, the electronic lock seat 16 is energized and locked, the locking pin 15 is rigidly locked in the U-shaped groove, the swing arm cannot swing back, the tarpaulin 2 continues to maintain a taut covering state, and the tarpaulin release operation is completed.

[0032] Fabric winding process: Press the fabric winding button on the remote terminal. The controller first controls the electronic lock seat 16 to unlock, and at the same time, the brake is energized and released. The clutch remains closed, and the drive motor 11 is energized and started, driving the roller 1 to rotate continuously in the winding direction. The tarpaulin 2 is wound onto the roller 1 layer by layer. The tension force generated by winding pulls the swing arm unit to lift from the unfolded position and gradually move towards the highest point. During the upward swing of the swing arm unit, the tension spring 13 is gradually stretched, and the elastic potential energy is continuously accumulated to reserve power for the next fabric release action. During this stage, the tension of the tension spring 13 is opposite to the winding direction. The load of the drive motor 11 increases linearly with the swing angle. The winding speed is stable and controllable, and the tarpaulin 2 is neatly wound without deviation. After the swing arm unit crosses the highest point directly above the axis of rotation, its own weight becomes the driving force for falling back to the retracting side, and the swing arm drives the roller 1 to accelerate back down; at this time, the tension spring 13 once again plays a damping role, limiting the acceleration of the fall and preventing the swing arm unit from quickly hitting the retracting limit; throughout the fall, the tarpaulin 2 remains taut, and the roller 1 retracting layer is tightly fitted, without any looseness, arching, or tangling; when the swing arm unit falls back to the retracting position, the swing arm positioning proximity switch on the retracting side triggers a signal, the controller controls the drive motor 11 to be de-energized, and the brake is simultaneously de-energized to lock the roller 1's rotation, and the entire mechanism remains in a retracting standby state; at this time, the roller 1 and the swing arm unit completely avoid the side space, and the side panel can be opened freely to support side loading and unloading operations.

[0033] Example 2: This embodiment adds a tarpaulin covering speed control unit to the existing embodiment 1. This unit is used to regulate the tarpaulin release speed after the swing arm passes overhead, further improving the stability of the covering process and the consistency of the tarpaulin 2 tension. The tarpaulin covering speed control unit is either electrically controlled by a side proximity switch 17 or a tension spring 18. When the side proximity switch 17 is used as the tarpaulin covering speed control unit, it is positioned 10° off the unfolding side from the highest point of the swing arm unit's rotation path on the side wall of the space to be covered. The side proximity switch 17 is connected to the controller to monitor whether at least one of the active swing arm 3 and the driven swing arm 4 has rotated past the path apex. During the tarpaulin release operation, the controller first controls the power-off brake. When the power is applied and the brake is released, the drive motor 11 remains in a stopped state. The tension return unit releases elastic potential energy to pull the swing arm unit from the retracted position to the highest point. The roller 1 swings with the swing arm unit and passively releases the fabric. When the side proximity switch 17 detects that the swing arm unit has passed the path apex and the system confirms that it is in the fabric release state, the controller controls the drive motor 11 to start. At a low speed, the roller 1 is reversed in the fabric release direction. The fabric is actively pulled by the roller 1 to achieve uniform spreading. With the secondary damping provided by the tension spring 13, the fabric release speed is stable throughout the process. The tarpaulin 2 is always kept taut, avoiding the impact and wrinkles on the fabric surface caused by the rapid swing of its own weight. This forms a flat and tight cover for the carriage body.

[0034] When the tension spring 18 is used as the speed control unit for tarpaulin covering, a set of speed control tension springs 18 is set for each of the active swing arm 3 and the driven swing arm 4. One end of the tension spring 18 is attached to a fixed hanging point outside the space to be covered, and the other end is connected to the hanging ear on the side of the corresponding swing arm unit near the space to be covered. When the swing arm unit is in a vertical position, the tension spring 18 is parallel to the axis of the swing arm unit. During the cloth laying operation, the tension return unit drives the swing arm unit to swing to the unfolding side, which drives the roller 1 to lay the cloth to cover the space to be covered. When the swing arm unit rotates below the highest point of the rotation path, the angle between the tension spring 18 and the axis of the swing arm is small, and there is no obvious resistance to the movement of the swing arm unit. When the swing arm unit rotates past the highest point of the rotation path, the tension spring 18 and the axis of the swing arm unit gradually deviate. As the swing angle increases, the deviation of the axis continues to increase. The tension spring 18 continuously forms a reverse traction on the swing arm unit, continuously providing damping for the covering process of the tarpaulin 2, counteracting the acceleration generated by the swing arm's own weight, making the swing speed of the swing arm stable and controllable, and making the covering of the tarpaulin 2 more stable.

[0035] Example 3: This embodiment describes a tarpaulin-style cargo box with a side-mounted tarpaulin, employing the roll-type tarpaulin-mounting device described in Embodiment 1. In this embodiment, the space to be covered is the upper area of ​​the cargo bed of the cargo box 19. The cargo box 19 is a standard dump truck cargo box, with side panels that can be flipped outwards and downwards on both sides, and an upward-folding rear door at the rear. The active swing arm 3 is mounted on the upper transverse midpoint of the front face of the cargo box near the front of the truck via a support body 8, and the driven swing arm 4 is mounted on the upper transverse midpoint of the rear face of the cargo box near the rear of the truck via a support body 8. The rotation centers of the two support bodies 8 are coaxial, with the axis extending longitudinally along the cargo box. The hook of the hanging component is attached to the outer hanging ring on one long side of the cargo box 19, and the electronic lock seat 16 is fixed to the outer side walls of the front and rear sides of the cargo box 19. After the tarpaulin 2 is fully unfolded, the roller 1 overlaps the outside of the corresponding long side of the cargo box 19, and the tarpaulin 2 spans the entire cargo box 19. The top opening of the 9-section achieves full-width sealed coverage. Additionally, the rear support 8 can be bolted to the bottom crossbeam of the rear tipping door, adapting to different box types without requiring structural modifications such as cutting or welding to the box body 19. In the retracted state, the swing arm unit drives the roller 1 back to the top (or bottom) of the side of the box body 19. The entire mechanism is completely outside the side panel's flipping trajectory, allowing both side panels to open fully outwards and downwards, supporting forklifts and excavators for loading and unloading goods from the side. In the unfolded state, the tarpaulin 2 completely covers the top opening of the box body 19, with rigid locking and secondary tensioning via the electronic lock seat 16. This provides wind and bump resistance during driving, effectively preventing material spillage and dust, meeting environmental regulations. Operators operate entirely from the ground via a remote control terminal, eliminating the need to climb the box and the risk of falls from heights. A single person can complete the retraction and deployment operations in a short time, making operation convenient and efficient.

[0036] The above embodiments are merely preferred embodiments of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention are included within the scope of the present invention.

Claims

1. A roll-type tarpaulin take-up and take-down device, characterized in that: include: A tarpaulin deployment unit includes a roller and a tarpaulin. One side of the tarpaulin is fixed and wound around the roller, and the other side of the tarpaulin is provided with a hanging assembly. The hanging assembly is attached to one side of the space to be covered. The swing arm unit includes an active swing arm and a driven swing arm facing each other. One end of each swing arm has a hole seat facing each other, and a bearing assembly is fitted and fixed inside the hole seat. A shaft with a shoulder is rotatably mounted inside the bearing assembly, and a support body is fixed to the end of the shaft away from the bearing assembly. A bearing seat is fixed to the other end of each swing arm. Both ends of the roller are rotatably mounted to the bearing seat via the bearing body. The support body is fixed to the middle of two opposite sides of the space to be covered. A winding power assembly is fixed to the outside of the shaft seat. The winding power assembly includes a drive motor with a power failure brake. The output shaft of the drive motor is connected to the input shaft of the reducer. The reducer is fixed to one end of the drum. The tension return unit is provided in two sets. The tension return unit is a tension spring or a coil spring. One end of the two sets of tension return units is connected to the lower part of the active swing arm and the driven swing arm through the ear seat. The other end of the two sets of tension return units is connected to the other side of the space to be covered through the ear seat. The mounting positions of the hanging components and the tension return units are set on the other two opposite sides of the space to be covered. The controller controls the entire machine, the winding power assembly is connected to the controller, and the controller is wirelessly connected to a remote control terminal.

2. The roll-type tarpaulin take-up and take-down device according to claim 1, characterized in that: It also includes a locking pin and a U-shaped electronic lock base. The locking pin is fixed to the lower part of the active swing arm and the driven swing arm near the hanging assembly. The electronic lock base is fixed to the opposite side of the space to be covered and is located on the side of the swing arm unit away from the hanging assembly. After the tarpaulin covers the space to be covered, the locking pin is engaged inside the electronic lock base.

3. The roll-type tarpaulin take-up and take-down device according to claim 1, characterized in that: It also includes a tarpaulin covering speed control unit, which is a tension spring or a side proximity switch; one end of the tension spring is connected to the outside of the space to be covered, and the other end of the tension spring is connected to the middle of the swing arm unit near the space to be covered; when the swing arm unit is perpendicular to the ground, the swing arm unit is parallel to the tension spring, and when the swing arm unit rotates away from the side of the hanging component and exceeds the highest point of the rotation path, the side proximity switch is triggered.

4. The roll-type tarpaulin take-up and take-down device according to claim 1, characterized in that: The roller is fixed with baffles at both ends, and the two sides of the tarpaulin are attached to the inner edge of the baffles.

5. The roll-type tarpaulin take-up and take-down device according to claim 1, characterized in that: The shoulder of the shaft is pressed against one end of the inner ring of the bearing assembly, and an end cap is pressed against the other end of the inner ring of the bearing assembly. The end cap is fixed to the end of the shaft by bolts.

6. The roll-type tarpaulin take-up and take-down device according to claim 1, characterized in that: It also includes a swing arm positioning proximity switch, which is located at the end of the stroke on both sides of the swing arm unit and fixed to the outer side of the space to be covered.

7. The roll-type tarpaulin take-up and take-down device according to claim 1, characterized in that: The mounting components are a row of hooks, cable ties, or buckles that are attached to the side of the space to be covered.

8. A carriage with a side-folding tarpaulin, comprising the roll-type tarpaulin folding device as described in any one of claims 1 to 7, characterized in that: The space to be covered is the vehicle body; the active swing arm is installed in the middle of the vehicle body near the front of the vehicle via a support body, and the driven swing arm is installed in the middle of the vehicle body near the rear of the vehicle via a support body.

9. The carriage with a retractable tarpaulin side as described in claim 8, characterized in that: When the tailgate of the vehicle body is an upward-opening structure, the driven swing arm is installed on the top of the vehicle body through the support body; when the tailgate of the vehicle body is a downward-opening structure, the driven swing arm is installed on the bottom of the vehicle body through the support body.

10. The carriage with a retractable tarpaulin side as described in claim 8, characterized in that: The mounting assembly is attached to the outside of one long side of the vehicle body. After the electronic lock seat is locked with the locking pin, the roller is attached to the outside of the other long side of the vehicle body.

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