A semitrailer's body door lock

Abstract

The present application relates to a kind of trailer car door lock, including including hanging rack, tightening module, anti-unthreading module, linkage module, security module.The present application is by the way of mechanical winding to tighten the binding rope, reduce the workload of worker and compared with artificial effect more remarkable, for the unthreading situation that binding rope can encounter is handled specifically, for the binding rope that winding tightens setting double anti-unthreading structure, prevent the back-off unthreading situation of binding rope after winding, for the binding rope that contact with goods is set with emergency tightener, when the binding rope that contact with goods and goods between activity causes unthreading, emergency binding rope is clamped and twisted, so that binding rope is in the state of emergency and is tightened, and sound and light alarm is sent to driver, driver will semi-trailer to safe zone after binding rope is re-tightened, try to reduce economic loss.

Description

Technical Field

[0001] This invention relates to the technical field of semi-trailer equipment, and in particular to a semi-trailer cargo box door lock. Background Technology

[0002] A semi-trailer is a trailer with its axle positioned behind the vehicle's center of gravity and equipped with a coupling device that transmits horizontal and vertical forces to the tractor. Semi-trailers are generally three-axle trailers, and there are many types, including dump semi-trailers, low-bed semi-trailers, stake semi-trailers, container semi-trailers, and tank semi-trailers. Semi-trailers have a variety of uses, typically for long-distance cargo transportation.

[0003] In the existing semi-trailer freight transportation process, such as the Chinese patent with announcement number CN217532670U, a container semi-trailer door with protective function is disclosed, including a box body, a door is provided on the outer wall of the box body, and a hydraulic rod is fixed on the outer surface of the door. The telescopic end of the hydraulic rod is fixedly connected to a first slider. The hydraulic rod pushes the first slider to slide along the slide groove, thereby causing the telescopic plate fixed on the outer wall of the first slider to extend downward to the ground. The outer wall of the telescopic plate is rotatably connected to the outer wall of the second slider through the slide groove, and a support plate is rotatably connected to it.

[0004] The aforementioned prior art primarily involves tilting the pallet between the ground and the container to facilitate unloading heavier goods from the container to the ground. However, this prior art does not consider the possibility of emergency braking or road bumps during semi-trailer operation. In such situations, the goods inside the trailer are prone to displacement or collision, leading to damage or falling out of the trailer and resulting in economic losses. If the goods are secured by strapping, the large size of the semi-trailer requires large, long, and heavy straps, making it difficult to fully tighten them manually. The ease with which the goods can loosen makes them unstable. On the other hand, even if the goods are manually secured before the truck departs, they may still slip between the goods and the straps when the truck encounters various emergencies during its journey (such as emergency braking or road bumps). Due to the uncertainty of the goods' shape (the goods may be irregular), if the straps were originally tied to a high point on the goods, they may slip to a low point nearby after the goods slip, causing the straps to loosen. This could result in damage to or falling of the goods. Drivers who are focused on driving may not be able to notice these situations in time and take timely measures to mitigate the losses.

[0005] Therefore, there is still room for improvement in the aforementioned existing technologies. Summary of the Invention

[0006] To ensure the secure fastening of cargo with straps during semi-trailer transport and to increase the reliability of the cargo box locks, this application provides a technical solution for a semi-trailer cargo box door lock as follows: A semi-trailer cargo compartment door lock includes a mounting frame, a tightening module, an anti-detachment module, a linkage module, and a safety module. The mounting frames are evenly installed on the semi-trailer cargo compartment via mounting bases. The mounting frames located on the cargo compartment door and the mounting frames located on the side walls of the cargo compartment can lock the cargo compartment door using locking pins. The tightening module is located at the lower part of the mounting frame and tightens the binding ropes to secure the cargo on the semi-trailer. The anti-detachment module is located at the upper part of the mounting frame and provides a safety clamp and limit to the tightened binding ropes to prevent them from loosening. The tightening module and the anti-detachment module cooperate through a linkage module. The safety module is located in the middle of the mounting frame and monitors the detachment of the binding ropes from the cargo and takes remedial tightening measures when the binding ropes become loose.

[0007] Preferably, the top of the mounting frame is a flip-open structure, which facilitates the connection of the strap rope. U-shaped locking blocks are provided on the front and rear sides of the mounting frame. The locking pins can be inserted into the two adjacent U-shaped locking blocks to lock the two adjacent mounting frames. The mounting frame and the mounting base are detachable, and the mounting frame can be disassembled according to actual use needs, which also facilitates the maintenance and replacement of the mounting frame.

[0008] Preferably, the tightening module includes a tightening roller, a ratchet and pawl mechanism, a hook-on rod, and a connecting mechanism. The tightening roller is rotatably mounted on the lower inner wall of the mounting frame. After the tightening roller rotates, it wraps the strap rope around its outer circumference, thereby tightening the strap rope. The ratchet and pawl mechanism cooperates between the tightening roller and the mounting frame. The ratchet and pawl mechanism restricts the rotation direction of the tightening roller, so that the tightening roller can only rotate in one direction during the tightening of the strap rope, avoiding the situation where the tightening roller rotates in the opposite direction and fails to tighten the strap rope. The hook-on rod is installed on the outer circumference of the tightening roller, and the connecting mechanism is located at the upper end of the mounting frame. The connecting mechanism and the hook-on rod are connected by a rope.

[0009] Preferably, the ratchet and pawl mechanism includes a ratchet, a pawl, a movable frame, a pressing hole, a locking component, a clearance groove, and a pressing handle. The ratchet is mounted on the front side of the tightening roller, and the ratchet and the tightening roller are coaxially arranged. The pawl is rotatably mounted on the movable frame, and the movable frame is slidably mounted on the front side wall of the mounting frame. In the initial state, the ratchet and pawl are in a engaged state, and the pawl allows the ratchet to rotate only in one direction. A tension spring connects the movable frame and the mounting frame, and the tension spring always tends to pull the movable frame outward. An inclined pressing hole is provided on the front side wall of the movable frame. The locking component is slidably mounted on the side wall of the mounting frame, and the outline shape of the locking component is similar to that of the ratchet and pawl. The compression holes are identical. The locking piece in the initial state is inserted into the compression hole to temporarily lock the position of the movable frame. The middle of the locking piece has a relief groove. After being pressed, the locking piece moves backward so that the relief groove corresponds to the position of the compression hole. Under the action of the tension spring, the movable frame slides along the inclined direction of the compression hole, thereby separating the ratchet and the pawl. The ratchet can rotate freely in the forward or reverse direction, thereby releasing the taut strap rope. The pressing handle is slidably mounted on the front side wall of the mounting frame. A pressing spring is connected between the pressing handle and the mounting frame. The pressing spring plays a role in resetting the pressing handle. The pressing handle is connected to the outer end of the locking piece.

[0010] Preferably, the connecting mechanism includes a mounting frame, a spiral spring, and a snap fastener. The mounting frame is installed on the top of the mounting frame, and a spiral spring is installed inside the mounting frame. A winding rope connects the spiral spring to the hanging rod. The snap fastener is installed on the winding rope through a spherical cover. In the initial state, the spiral spring is in a contracted state. At this time, the spiral spring restricts the position of the snap fastener to the upper end of the mounting frame through the winding rope. Personnel can easily open the spherical cover to connect the strap rope to the snap fastener. After the connection is completed, the spherical cover is closed. The closed spherical cover is cylindrical, which can reduce friction with objects and facilitate the movement of the winding rope. The alarm component is installed on the top inner wall of the mounting frame. When the safety module is triggered, the alarm component emits an audible and visual alarm. The alarm component consists of an alarm and a power supply unit. The power supply unit includes a start switch and a power source. When the safety roller moves upward, it triggers the start switch, forming a closed circuit between the alarm and the power supply unit. The alarm emits an audible and visual alarm.

[0011] Preferably, the anti-detachment module includes an anti-detachment roller, a roller frame, and a locking mechanism. The anti-detachment roller is rotatably mounted on the roller frame via a one-way bearing, which allows the anti-detachment roller to rotate only in one direction. The outer circumferential surface of the anti-detachment roller is provided with a rough layer, which increases the friction between the anti-detachment roller and the binding rope, preventing accidental slippage between the binding rope and the anti-detachment roller. The roller frame is slidably mounted on the upper part of the hanger. The roller frame sliding to the right causes the anti-detachment roller to gradually approach the safety roller. The anti-detachment roller and the safety roller work together to clamp the binding rope and prevent it from loosening. A return spring is connected between the roller frame and the hanger, which serves to reset the binding rope. The locking mechanism temporarily locks the position between the roller frame and the hanger.

[0012] Preferably, the locking mechanism includes a locking element, a latching element, a compression spring, and an unlocking element. The locking element is installed on the right side of the roller frame and is arrow-shaped. The latching element consists of a mounting plate, a locking block, and an unlocking block. The mounting plate is slidably disposed in a sliding cavity opened in the side wall of the mounting frame. A compression spring connects the mounting plate and the sliding cavity, and the compression spring acts as a reset mechanism. A locking block is installed on the left side of the mounting plate. The left side of the locking block has an inclined structure, and the locking block corresponds to the position of the locking element. When the locking element moves to the right, it presses against the locking block. The pressed locking block causes the mounting plate to move upward, compressing the compression spring. When the locking element passes... After the locking block is engaged, the mounting plate moves downward to reset under the action of the compression spring. The reset locking block locks the position of the locking piece, that is, the position between the roller frame and the mounting frame. An unlocking block is installed on the right side of the mounting plate. The front side of the unlocking block is inclined. The unlocking piece is slidably set on the side wall of the mounting frame. The position of the unlocking piece corresponds to that of the unlocking block. Pressing the unlocking piece causes the unlocking piece to squeeze the unlocking block. The squeezed unlocking block causes the mounting plate to move upward. The locking block moves upward with the mounting plate and no longer limits the locking piece. Under the action of the reset spring, the roller frame resets, and the outer end of the unlocking piece connects with the pressing handle.

[0013] Preferably, the linkage module includes a rotating component, a first bevel gear, a second bevel gear, a pulley assembly, and a propulsion mechanism. The rotating component is rotatably mounted in the mounting frame. A locking interface is provided at the left end of the rotating component, which is compatible with existing electric wrenches. The first bevel gear is mounted at the right end of the rotating component. The second bevel gear is rotatably mounted on the rear side wall of the mounting frame. The second bevel gear is connected to the tightening roller through the pulley assembly. The electric wrench is fitted and locked to the locking interface, and the electric wrench drives the rotating component to rotate. The rotating component drives the second bevel gear to rotate through the first bevel gear, and the rotating second bevel gear drives the tightening roller to rotate through the pulley assembly, thereby tightening the binding rope. The propulsion mechanism is located in the middle of the rotating component, and the rotating component and the roller frame cooperate through the propulsion mechanism.

[0014] Preferably, the propulsion mechanism includes an extrusion component and a mating component. The extrusion component is mounted on the rotating component via an auxiliary component. The cross-section of the extrusion component is arc-shaped and the extrusion component tends to rise at an angle from left to right. The mating component is mounted on the lower end of the roller frame. The mating component and the extrusion component are positioned correspondingly. When the rotating component rotates, the extrusion component rotates with the rotating component. The inclined surface of the rotating extrusion component continuously presses against the mating component, causing the mating component to move to the right, and the roller frame is pushed to the right.

[0015] Preferably, the safety module includes a safety roller, a base, a clamping mechanism, and a triangular block. The safety roller is rotatably mounted on the mounting bracket via a one-way bearing. A push-out spring connects the mounting bracket and the hanger, serving as a reset mechanism. The one-way bearing allows the safety roller to rotate only in one direction. The mounting bracket slides up and down on the hanger. A taut strap compresses the safety roller, causing the mounting bracket to descend to its lowest position. When the strap loosens, the pressure on the safety roller decreases, and the mounting bracket moves upward to reset under the action of the push-out spring. The surface of the safety roller is provided with an anti-slip layer. Friction between the strap and the safety roller is added to prevent accidental slippage between the strap and the safety roller. The base is installed on the inner wall of the hanger frame via an elastic telescopic rod. The clamping mechanism is installed on the base, and the triangular block is installed on the roller frame. The right side of the triangular block has an angled structure, and the left side of the base has an angled structure that cooperates with the triangular block. When the triangular block moves to the right, it squeezes against the base. After being squeezed, the base moves towards the center of the hanger frame. The elastic telescopic rod extends, and the clamping mechanism follows the base towards the center, thus limiting the strap in the front and back directions and preventing the strap from becoming skewed during winding.

[0016] Preferably, the clamping mechanism includes a structural plate, a clamping plate, a guide groove, a gear, a rack plate, an elastic element, and a snap-fit ​​groove. The structural plate is rotatably mounted on the base via a rotating shaft. The clamping plate is slidably mounted on the structural plate. There are two clamping plates. Guide posts are installed on the outer side of the clamping plates and are slidably mounted in guide grooves opened on the inner wall of the base. The gear is sleeved and installed on the outer circumference of the rotating shaft. The rack plate is slidably mounted up and down inside the base. A return spring connects the rack plate and the base, and the return spring plays a reset role. The rack plate meshes with the gear. An elastic element is installed on the upper end of the rack plate. A snap-fit ​​groove corresponding to the position of the elastic element is provided on the mounting bracket. The guide groove is inclined. When the mounting bracket moves to the lowest position, the base... When the seat is in its smallest position, the elastic element is inserted into the locking groove. Then, when the strap rope loosens, the upward-moving mounting bracket drives the rack plate to move upward, causing the gear meshing with the rack plate to rotate. The rotating shaft rotates with the gear, the structural plate rotates, and the clamping plate rotates with the structural plate. The rotating clamping plate causes the guide post to move in the guide groove, thereby bringing the clamping plates together. The clamping plates clamp the strap rope tightly, and at this time, the clamping plates are in a torsional state, which to some extent re-tightens the strap rope. When the triangular block is reset, the elastic telescopic rod retracts and resets, the base resets, the elastic element separates from the locking groove, and under the action of the return spring, the rack plate moves downward and resets, and the clamping plate resets.

[0017] In summary, the beneficial technical effects of this application are as follows: The semi-trailer cargo door lock of this invention uses a mechanical winding method to tighten the tie ropes, which not only greatly reduces the workload of workers but also has a more significant effect than manual tightening. It incorporates targeted anti-loosening measures to address potential loosening of the tie ropes. A double anti-loosening structure is designed for the wound and tightened tie ropes to prevent them from slipping back after winding. An emergency tightening device is installed for the tie ropes in contact with the cargo. If the tie rope in contact with the cargo moves and becomes loose, it will be clamped and twisted immediately to tighten the tie rope in an emergency, triggering an audible and visual alarm to alert the driver. The driver can then move the semi-trailer to a safe area and re-tighten the tie ropes, minimizing economic losses. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the invention used in conjunction with a semi-trailer; Figure 2 This is the present invention. Figure 1 Enlarged view of a portion at point A; Figure 3 This is a schematic diagram of the overall structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the present invention; Figure 5 This is a cross-sectional view of the overall structure of the present invention; Figure 6 This is a schematic diagram of the locking mechanism of the present invention; Figure 7 This is the present invention. Figure 6 A magnified view of section B; Figure 8 This is a structural diagram of the tightening module and the anti-detachment module of the present invention; Figure 9 This is a schematic diagram of the ratchet and pawl mechanism of the present invention; Figure 10 This is a schematic diagram of the security module of the present invention; Figure 11 This is a schematic diagram of the clamping mechanism of the present invention; Figure 12 This is a schematic diagram of the structure of the paperclip of the present invention.

[0019] Explanation of reference numerals in the attached drawings: 1. Mounting frame; 2. Tightening module; 3. Anti-detachment module; 4. Linkage module; 5. Safety module; 21. Tightening roller; 22. Ratchet and pawl mechanism; 23. Mounting rod; 24. Connecting mechanism; 221. Ratchet; 222. Pawl; 223. Movable frame; 224. Pressing hole; 225. Locking component; 226. Clearance groove; 227. Press handle; 241. Mounting bracket; 242. Spiral spring; 243. Buckle; 244. Alarm component; 31. Anti-detachment roller; 32. Roller frame; 33. 331. Locking mechanism; 332. Locking buckle; 333. Compression spring; 334. Unlocking component; 41. Rotating component; 42. Bevel gear one; 43. Bevel gear two; 44. Pulley assembly; 45. Propulsion mechanism; 451. Extrusion component; 452. Mating component; 51. Safety roller; 52. Base; 53. Clamping mechanism; 54. Triangular block; 531. Structural plate; 532. Clamping plate; 521. Guide groove; 533. Gear; 534. Rack plate; 535. Elastic component; 536. Snap-fit ​​groove. Detailed Implementation

[0020] The following is in conjunction with the appendix Figures 1-12 This application will be described in further detail.

[0021] This application discloses a semi-trailer cargo compartment door lock, which automatically tightens the straps and incorporates measures such as anti-loosening, emergency tightening, and audible and visual alarms to prevent cargo from becoming unstable or falling off.

[0022] Reference Figure 3 , Figure 5As shown, a semi-trailer cargo compartment door lock includes a mounting frame 1, a tightening module 2, an anti-detachment module 3, a linkage module 4, and a safety module 5. The mounting frame 1 is evenly installed on the semi-trailer cargo compartment via a mounting base. The mounting frame 1 located on the cargo compartment door and the mounting frame 1 located on the side wall of the cargo compartment can be locked together by a pin locking device. The tightening module 2 is located at the lower part of the mounting frame 1. The tightening module 2 wraps and tightens the binding rope to secure the cargo on the semi-trailer. The anti-detachment module 3 is located at the upper part of the mounting frame 1. The anti-detachment module 3 provides a safety clamp and limit to the binding rope after it has been tightened by the tightening module 2 to prevent it from loosening. The tightening module 2 and the anti-detachment module 3 cooperate with each other through the linkage module 4. The safety module 5 is located in the middle of the mounting frame 1. The safety module 5 monitors the detachment of the binding rope from the cargo and takes remedial tightening measures when the binding rope becomes loose.

[0023] Before loading, mount 1 is placed on the mounting base. After loading the goods, the mount 1 installed on the truck bed door is connected to the mount 1 installed on the side wall of the truck bed using the locking pin, thus locking the truck bed door to the adjacent side wall. Then, one end of the tie-down rope is fixed to one side of the semi-trailer, and the other end of the tie-down rope is connected to the tightening module 2 after passing over the goods. The tightening module 2 is controlled by an electric wrench, and the tightening module 2 continuously winds up and tightens the tie-down rope until the goods are firmly secured. During subsequent transportation, the anti-loosening module 3 always clamps the portion of the tie-down rope tightened by the tightening module 2 to prevent loosening. When the tie-down rope in contact with the goods becomes loose (possibly due to bumps during the journey causing the tie-down rope to come loose from the goods), the anti-loosening module 3 will prevent the goods from coming loose. When slippage occurs between goods, causing the strapping rope to slide from a high point to a low point, resulting in the strapping rope becoming loose, safety module 5 is triggered. Safety module 5 twists and clamps the loose strapping rope to tighten it again. If the strapping rope is loosened significantly, tightening module 2 will issue an audible and visual alarm while ensuring the strapping rope does not fall off, reminding the driver to tighten the strapping rope again after driving to a safe area. This application avoids the loosening and instability that may occur with manual binding and tightening by automatically tightening the strapping rope. It also includes emergency tightening and audible and visual alarm structures to address situations such as minor and major loosening of the strapping rope, ensuring the safety and stability of transported goods and preventing dangerous situations such as goods falling off.

[0024] Reference Figure 2 , Figure 3 As shown, the top of the mounting frame 1 is a flip-open structure, which facilitates the connection of the strap rope. U-shaped locking blocks are provided on the front and rear sides of the mounting frame 1. The locking pins can be inserted into the two adjacent U-shaped locking blocks to lock the two adjacent mounting frames 1. The mounting frame 1 and the mounting base are detachable, and the mounting frame 1 can be disassembled according to actual use needs, which also facilitates the maintenance and replacement of the mounting frame 1.

[0025] During the actual locking process, the locking pin is inserted between the U-shaped latch on the truck bed door and the U-shaped latch on the side wall of the truck bed to lock the truck bed door. Then, the top of the trailer frame 1 can be flipped open, the tie rope can be pulled to the trailer frame 1 and the tie rope can be connected and secured to the tightening module 2. Then, the top of the trailer frame 1 can be closed.

[0026] Reference Figure 4 , Figure 5 As shown, in order to tighten the strap rope, this application provides a tightening module 2. The tightening module 2 includes a tightening roller 21, a ratchet and pawl mechanism 22, a hook rod 23, and a connecting mechanism 24. The tightening roller 21 is rotatably mounted on the lower inner wall of the mounting frame 1. After the tightening roller 21 rotates, it wraps the strap rope around its outer circumference, thereby tightening the strap rope. The ratchet and pawl mechanism 22 is engaged between the tightening roller 21 and the mounting frame 1. The ratchet and pawl mechanism 22 restricts the rotation direction of the tightening roller 21, so that the tightening roller 21 can only rotate in one direction during the tightening of the strap rope, avoiding the situation where the tightening roller 21 rotates in the opposite direction and fails to tighten the strap rope. The hook rod 23 is installed on the outer circumference of the tightening roller 21. The connecting mechanism 24 is located at the upper end of the mounting frame 1, and the connecting mechanism 24 and the hook rod 23 are connected by a rope.

[0027] Reference Figure 3 , Figure 9As shown, the ratchet and pawl mechanism 22 includes a ratchet 221, a pawl 222, a movable frame 223, a pressing hole 224, a locking component 225, a clearance groove 226, and a pressing handle 227. The ratchet 221 is mounted on the front side of the tightening roller 21, and the ratchet 221 and the tightening roller 21 are coaxially arranged. The pawl 222 is rotatably mounted on the movable frame 223, and the movable frame 223 is slidably mounted on the front side wall of the mounting frame 1. In the initial state, the ratchet 221 and the pawl 222 are in a engaged state, and the pawl 222 causes the ratchet 221 to rotate only in one direction. A tension spring connects the movable frame 223 and the mounting frame 1, and the tension spring always tends to pull the movable frame 223 outward. An inclined pressing hole 224 is provided on the front side wall of the movable frame 223. The locking component 225 is slidably mounted on the side wall of the mounting frame 1. The outline shape of 25 is the same as that of the compression hole 224. The locking part 225 in the initial state is inserted into the compression hole 224 to temporarily lock the position of the movable frame 223. The middle part of the locking part 225 has a relief groove 226. After the locking part 225 is pressed, it moves backward so that the relief groove 226 corresponds to the position of the compression hole 224. Under the action of the tension spring, the movable frame 223 slides along the inclined direction of the compression hole 224, thereby separating the ratchet 221 and the pawl 222. The ratchet 221 can rotate freely in the forward or reverse direction, thereby releasing the taut strap rope. The pressing handle 227 is slidably set on the front side wall of the mounting frame 1. A pressing spring is connected between the pressing handle 227 and the mounting frame 1. The pressing spring plays the role of resetting the pressing handle 227. The pressing handle 227 is connected to the outer end of the locking part 225.

[0028] Reference Figure 5 , Figure 12 As shown, the connecting mechanism 24 includes a mounting frame 241, a spiral spring 242, and a snap fastener 243. The mounting frame 241 is mounted on the top of the mounting frame 1. The spiral spring 242 is installed inside the mounting frame 241. A winding rope connects the spiral spring 242 and the hanging rod 23. The snap fastener 243 is mounted on the winding rope through a spherical cover. In the initial state, the spiral spring 242 is in a contracted state. At this time, the spiral spring 242 restricts the position of the snap fastener 243 to the upper end of the mounting frame 1 through the winding rope. Personnel can easily open the spherical cover to remove the strap rope. It is connected to the snap fastener 243. After the connection is completed, the spherical cover is closed. The closed spherical cover is cylindrical, which can reduce friction with the object and facilitate the winding of the rope to drive its movement. The alarm component 244 is installed on the top inner wall of the hanger 1. When the safety module 5 is triggered, the alarm component 244 emits an audible and visual alarm. The alarm component 244 consists of an alarm and a power supply unit. The power supply unit includes a start switch and a power supply. When the safety roller 51 moves upward, it will trigger the start switch to form a closed circuit between the alarm and the power supply unit, and the alarm will emit an audible and visual alarm.

[0029] During the actual tightening of the strap rope, the strap rope is connected and fixed to the buckle 243. Then, the tightening roller 21 rotates, and the winding rope is continuously wound up by the tightening roller 21. The spiral spring 242 is stretched, and the strap rope is wound up along with the winding rope by the tightening roller 21, gradually tightening the strap rope. During the rotation of the tightening roller 21, the ratchet 221 and pawl 222 cooperate to ensure that the tightening roller 21 can only rotate in one direction, thereby preventing the tightening roller 21 from accidentally rotating back and causing the strap rope to loosen. When unloading is required later, pressing the pressing handle 227 causes the locking part 225 to move backward, avoiding the gap between the groove 226 and the compression hole. The positions of 224 correspond, and under the action of the tension spring, the movable frame 223 slides along the inclined direction of the compression hole 224, thereby separating the ratchet 221 and the pawl 222. The ratchet 221 can rotate freely in the forward or reverse direction. At this time, the spiral spring 242 retracts and resets, and the spiral spring 242 pulls the winding rope to reset. The ratchet 221 rotates in the reverse direction, and the tie rope resets along with the winding rope. After that, the reset tie rope is untied from the buckle 243, and the cargo can be unloaded. If the tie rope becomes loose during the semi-trailer's operation, the alarm component 244 will sound an alarm to remind the driver.

[0030] Reference Figure 4 , Figure 8 As shown, the tie-up rope may loosen after being tightened. Therefore, this application provides an anti-loosening module 3, which includes an anti-loosening roller 31, a roller frame 32, and a locking mechanism 33. The anti-loosening roller 31 is rotatably mounted on the roller frame 32 via a one-way bearing, which allows the anti-loosening roller 31 to rotate only in one direction. The outer circumferential surface of the anti-loosening roller 31 is provided with a rough layer, which increases the friction between the tie-up rope and the anti-loosening roller 31, preventing accidental slippage between the tie-up rope and the anti-loosening roller 31. The roller frame 32 is slidably mounted on the upper part of the hanger 1. The roller frame 32 sliding to the right causes the anti-loosening roller 31 to gradually approach the safety roller 51. The anti-loosening roller 31 and the safety roller 51 work together to clamp the tie-up rope and prevent it from loosening. A return spring is connected between the roller frame 32 and the hanger 1, which serves to reset the tie-up rope. The locking mechanism 33 temporarily locks the position between the roller frame 32 and the hanger 1.

[0031] Reference Figure 7As shown, the locking mechanism 33 includes a locking member 331, a latching member 332, a compression spring 333, and an unlocking member 334. The locking member 331 is installed on the right side of the roller frame 32 and is arrow-shaped. The latching member 332 consists of a mounting plate, a locking block, and an unlocking block. The mounting plate is slidably disposed in a sliding cavity opened in the side wall of the mounting frame 1. A compression spring 333 is connected between the mounting plate and the sliding cavity, and the compression spring 333 plays a reset role. A locking block is installed on the left side of the mounting plate. The left side of the locking block has an inclined structure. The locking block corresponds to the position of the locking member 331. When the locking member 331 moves to the right, it presses the locking block. The pressed locking block causes the mounting plate to move upward, and the compression spring 333 is compressed. When the locking member 331 moves to the right, it presses the locking block. The locked block causes the mounting plate to move upward, and the compression spring 333 is compressed. After 331 passes the locking block, the mounting plate moves downward and resets under the action of the compression spring 333. The reset locking block locks the position of the locking piece 331, that is, the position between the roller frame 32 and the mounting frame 1. An unlocking block is installed on the right side of the mounting plate. The front side of the unlocking block is an inclined structure. The unlocking piece 334 is slidably set on the side wall of the mounting frame 1. The position of the unlocking piece 334 corresponds to the unlocking block. Pressing the unlocking piece 334 causes the unlocking piece 334 to squeeze the unlocking block. The squeezed unlocking block causes the mounting plate to move upward. The locking block moves upward with the mounting plate and no longer limits the locking piece 331. Under the action of the reset spring, the roller frame 32 resets, and the outer end of the unlocking piece 334 is connected to the pressing handle 227.

[0032] During the actual anti-loosening process, as the tightening roller 21 rotates to tighten the strap rope, the roller frame 32 gradually moves closer to the safety roller 51. The anti-loosening roller 31 and the safety roller 51 move closer together (during this process, the buckle 243 passes between them, preventing interference or jamming). The locking piece 331 moves to the right and presses against the locking block. The pressed locking block causes the mounting plate to move upward, compressing the spring 333. After the locking piece 331 passes the locking block, the mounting plate moves downward to reset under the action of the spring 333. The reset locking block locks the position of the locking piece 331, thus locking the position between the roller frame 32 and the mounting frame 1, and also locking the position between the anti-loosening roller 31 and the safety roller 51. When the rollers are brought to their minimum position, the anti-detachment roller 31 and safety roller 51, located at this position, cooperate to clamp the strap rope. Since both the anti-detachment roller 31 and safety roller 51 rotate in one direction, the strap rope can move from between the anti-detachment roller 31 and safety roller 51 toward the tightening roller 21 at this moment, but the strap rope cannot retract, thereby achieving the purpose of preventing the strap rope from loosening (preventing the loosening of the portion of the strap rope wound by the tightening roller 21). When unloading, pressing the pressing handle 227 causes the unlocking block, which is squeezed, to move the mounting plate upward. The locking block moves upward with the mounting plate, thus no longer limiting the locking component 331. Under the action of the return spring, the roller frame 32 returns to its original position, and the anti-detachment roller 31 and safety roller 51 separate, thus no longer clamping and preventing loosening of the strap rope, and the strap rope can freely return to its original position.

[0033] Reference Figure 8 As shown, using machinery to replace manual labor in tightening the straps can greatly improve efficiency. Therefore, this application includes a linkage module 4, which comprises a rotating component 41, a first bevel gear 42, a second bevel gear 43, a pulley assembly 44, and a propulsion mechanism 45. The rotating component 41 is rotatably mounted in the mounting frame 1. A locking interface 411 is provided at the left end of the rotating component 41, which is compatible with existing electric wrenches. The first bevel gear 42 is mounted at the right end of the rotating component 41, and the second bevel gear 43 is rotatably mounted in the mounting frame 1. On the rear side wall, bevel gear 43 is connected to the tightening roller 21 via pulley assembly 44. The electric wrench is fitted and engaged with the locking interface 411, and the electric wrench drives the rotating part 41 to rotate. The rotating part 41 drives bevel gear 43 to rotate via bevel gear 42. The rotating bevel gear 43 drives the tightening roller 21 to rotate via pulley assembly 44, thereby tightening the binding rope. The pushing mechanism 45 is located in the middle of the rotating part 41. The rotating part 41 and the roller frame 32 cooperate through the pushing mechanism 45.

[0034] Reference Figure 8As shown, the propulsion mechanism 45 includes an extrusion member 451 and a mating member 452. The extrusion member 451 is mounted on the rotating member 41 via an auxiliary member. The cross-section of the extrusion member 451 is arc-shaped and the extrusion member 451 tends to rise at an angle from left to right. The mating member 452 is mounted on the lower end of the roller frame 32. The mating member 452 and the extrusion member 451 are positioned correspondingly. When the rotating member 41 rotates, the extrusion member 451 rotates with the rotating member 41. The inclined surface of the rotating extrusion member 451 continuously presses the mating member 452, causing the mating member 452 to move to the right, and the roller frame 32 is pushed to the right.

[0035] During the actual driving process, the operator engages the electric wrench with the locking interface 411 and starts the electric wrench. The electric wrench drives the rotating part 41 to rotate continuously. The first bevel gear 42 rotates with the rotating part 41. The rotating bevel gear 42 drives the second bevel gear 43 to rotate. The rotating bevel gear 43 drives the tightening roller 21 to rotate through the pulley assembly 44, thereby tightening the binding rope. At the same time, as the rotating part 41 rotates continuously, the pressing part 451 rotates with the rotating part 41. The inclined surface of the rotating pressing part 451 continuously presses the mating part 452, causing the mating part 452 to move to the right, and the roller frame 32 is pushed to the right.

[0036] Reference Figure 4 , Figure 10 As shown, the strapping rope may loosen accidentally after being tightened on the goods. Therefore, this application includes a safety module 5, which comprises a safety roller 51, a base 52, a clamping mechanism 53, and a triangular block 54. The safety roller 51 is rotatably mounted on the mounting bracket via a one-way bearing. A push-out spring connects the mounting bracket and the hanger 1, acting as a reset mechanism. The one-way bearing ensures that the safety roller 51 can only rotate in one direction. The mounting bracket slides up and down on the hanger 1. The tightened strapping rope exerts pressure on the safety roller 51, causing the mounting bracket to descend to its lowest position. When the strapping rope loosens, the pressure on the safety roller 51 decreases, and the mounting bracket moves upward to reset under the action of the push-out spring. The surface is provided with an anti-slip layer, which increases the friction between the strap and the rope, thereby preventing accidental slippage between the strap and the safety roller 51. The base 52 is installed on the inner wall of the hanger 1 via an elastic telescopic rod. The clamping mechanism 53 is installed on the base 52, and the triangular block 54 is installed on the roller frame 32. The right side of the triangular block 54 has an angled structure, and the left side of the base 52 has an angled structure that cooperates with the triangular block 54. When the triangular block 54 moves to the right, it squeezes against the base 52. After being squeezed, the base 52 moves towards the center of the hanger 1, the elastic telescopic rod extends, and the clamping mechanism 53 follows the base 52 towards the center, thereby limiting the strap in the front and back directions and preventing the strap from becoming skewed during winding.

[0037] Reference Figure 10 , Figure 11 As shown, the clamping mechanism 53 includes a structural plate 531, a clamping plate 532, a guide groove 521, a gear 533, a rack plate 534, an elastic element 535, and a snap-fit ​​groove 536. The structural plate 531 is rotatably mounted on the base 52 via a rotating shaft. The clamping plate 532 is slidably mounted on the structural plate 531. There are two clamping plates 532. Guide posts are installed on the outer side of the clamping plates 532, and the guide posts are slidably mounted on the guide groove 521 opened on the inner wall of the base 52. In section 21, gear 533 is sleeved and installed on the outer circumference of the rotating shaft. Rack plate 534 is slidably disposed inside base 52. A return spring connects rack plate 534 and base 52, serving a reset function. Rack plate 534 meshes with gear 533. An elastic element 535 is installed at the upper end of rack plate 534. A locking groove 536 corresponding to the position of elastic element 535 is provided on the mounting bracket. The guide groove 521 is inclined. When the mounting bracket... When the base 52 is moved to its lowest position and close to its minimum position, the elastic element 535 is inserted into the snap-fit ​​groove 536. Then, when the strap rope loosens, the upward-moving mounting bracket drives the rack plate 534 to move upward, thereby causing the gear 533 meshing with the rack plate 534 to rotate. The rotating shaft rotates with the gear 533, the structural plate 531 rotates, and the clamping plate 532 rotates with the structural plate 531. The rotating clamping plate 532 causes the guide post to move in the guide groove 521, thereby causing the clamping plates 532 to come together. The coming together clamping plates 532 clamp the strap rope, and at this time the clamping plates 532 are in a torsional state, thereby tightening the strap rope to a certain extent. When the subsequent triangular block 54 is reset, the elastic telescopic rod retracts and resets, the base 52 resets, the elastic element 535 separates from the snap-fit ​​groove 536, and under the action of the return spring, the rack plate 534 moves downward and resets, and the clamping plate 532 resets.

[0038] During the tightening process of the tightening roller 21, the triangular block 54 moves to the right along with the roller frame 32. The rightward-moving triangular block 54 is squeezed against the base 52. After being squeezed, the base 52 moves closer to the center of the mounting frame 1, the elastic telescopic rod extends, and the clamping mechanism 53 moves closer to the center along with the base 52. The cooperation between the structural plate 531 and the clamping plate 532 plays a certain limiting role in the front-back direction of the strapping rope (at this time, the clamping plate 532 is only located on the outside of the strapping rope and does not clamp the strapping rope). At the same time, the strapping rope in the winding process puts pressure on the safety roller 51, thereby causing the mounting bracket to descend. When the strapping rope is taut, the mounting bracket descends to the lowest position. At this time, the elastic element 535 is inserted into the snap-fit ​​groove 536, and when the subsequent strapping rope... When loosening occurs, the pressure on the safety roller 51 decreases, and the mounting bracket moves upward and resets under the action of the ejection spring. The upward-moving mounting bracket drives the rack plate 534 to move upward, thereby causing the gear 533 meshing with the rack plate 534 to rotate. The rotating shaft rotates with the gear 533, the structural plate 531 rotates, and the clamping plate 532 rotates with the structural plate 531. The rotating clamping plate 532 causes the guide post to move in the guide groove 521, thereby bringing the clamping plates 532 closer together. The clamping plate 532 clamps the strap rope, and at this time the clamping plate 532 is in a torsional state, thereby re-tightening the strap rope (only for emergency tightening). At the same time, the upward-moving mounting bracket triggers the alarm component 244 to issue an audible and visual alarm.

[0039] The implementation principle of this embodiment is as follows: Step 1: Install the mounting bracket 1, and after the cargo is loaded, lock the semi-trailer's cargo compartment door using the latch locking device; Step 2: Secure one end of the strap rope to one side of the semi-trailer, and connect the other end of the strap rope to the loop fastener 243 after passing over the cargo. Step 3: Connect the electric wrench to the locking interface 411 and start the electric wrench; Step 4: Tightening module 2 continuously winds up and tightens the straps until the goods are firmly secured, and anti-loosening module 3 clamps the portion of the straps tightened by tightening module 2 to prevent loosening. Step 5: When the part of the strap that is in contact with the goods becomes loose, the safety module 5 is triggered. The safety module 5 twists and clamps the loose strap, thereby tightening the strap again. Step 6: If the straps are too loose, the tightening module 2 will issue an audible and visual alarm while ensuring that the straps do not come off, reminding the driver to tighten the straps again after driving to a safe area. Step 7: After reaching the designated position, press the handle 227 to unlock the tightening roller 21, separate the anti-detachment roller 31 from the safety roller 51, and loosen and reset the strap rope; Step 8: Remove the locking pins and open the cargo door to unload the goods.

[0040] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A lock for the cargo box door of a semi-trailer, characterized in that, include: The mounting bracket (1) is evenly installed on the cargo box of the semi-trailer by means of the mounting base. The mounting bracket (1) located on the cargo box door and the mounting bracket (1) located on the side wall of the cargo box can lock the cargo box door by means of a locking pin. The tightening module (2) is located at the lower part of the mounting frame (1). The tightening module (2) wraps and tightens the strap rope to secure the cargo on the semi-trailer. The anti-detachment module (3) is set on the upper part of the mounting frame (1). The anti-detachment module (3) clamps and limits the tightened strap rope after the tightening module (2) is tightened, so as to prevent the tightened strap rope from loosening. The tightening module (2) and the anti-detachment module (3) cooperate through the linkage module (4). Safety module (5), which is located in the middle of the hanger (1), monitors the detachment of the straps binding the goods from the goods and takes remedial tightening measures when the straps come loose; The tightening module (2) includes: The tightening roller (21) is rotatably mounted on the lower inner wall of the mounting frame (1), and a ratchet and pawl mechanism (22) is fitted between the tightening roller (21) and the mounting frame (1); A hook rod (23) is mounted on the outer periphery of the tightening roller (21); The connecting mechanism (24) is located at the upper end of the mounting frame (1), and the connecting mechanism (24) and the hanging rod (23) are connected by a rope. The anti-detachment module (3) includes: An anti-detachment roller (31) is rotatably mounted on a roller frame (32) via a one-way bearing. A rough layer is provided on the outer circumferential surface of the anti-detachment roller (31). The roller frame (32) is slidably mounted on the upper part of the hanger (1). A return spring is connected between the roller frame (32) and the hanger (1). The locking mechanism (33) temporarily locks the position between the roller frame (32) and the mounting frame (1); The linkage module (4) includes: The rotating part (41) is rotatably mounted in the mounting frame (1). The left end of the rotating part (41) is provided with a card interface (411), and the right end of the rotating part (41) is equipped with a bevel gear (42). The second bevel gear (43) is rotatably mounted on the rear side wall of the mounting frame (1), and the second bevel gear (43) is connected to the tightening roller (21) through the pulley assembly (44); The propulsion mechanism (45) is located in the middle of the rotating part (41), and the rotating part (41) and the roller frame (32) cooperate through the propulsion mechanism (45); The propulsion mechanism (45) includes: The extrusion part (451) is mounted on the rotating part (41) by means of an auxiliary part. The cross section of the extrusion part (451) is arc-shaped and the extrusion part (451) tends to rise from left to right. The mating part (452) is installed at the lower end of the roller frame (32), and the mating part (452) is positioned corresponding to the extruder (451).

2. The semi-trailer cargo box door lock according to claim 1, characterized in that, The ratchet and pawl mechanism (22) includes: A ratchet (221) is installed on the front side of the tightening roller (21), and the ratchet (221) and the tightening roller (21) are arranged coaxially. A pawl (222) is rotatably mounted on a movable frame (223). The movable frame (223) is slidably mounted on the front side wall of the mounting frame (1). A tension spring is connected between the movable frame (223) and the mounting frame (1). An inclined compression hole (224) is provided on the front side wall of the movable frame (223). The locking component (225) is slidably mounted on the side wall of the mounting frame (1). The outline shape of the locking component (225) is the same as that of the extrusion hole (224). A relief groove (226) is provided in the middle of the locking component (225). The pressing handle (227) is slidably mounted on the front side wall of the mounting frame (1). A pressing spring is connected between the pressing handle (227) and the mounting frame (1). The pressing handle (227) is connected to the outer end of the locking piece (225).

3. The semi-trailer cargo box door lock according to claim 1, characterized in that, The connecting mechanism (24) includes: Mounting bracket (241) is installed on top of the hanger (1). Inside the mounting bracket (241) is a spiral spring (242). A winding rope is connected between the spiral spring (242) and the hanger rod (23). The paperclip (243) is set on the winding rope through a spherical cover. The spherical cover is opened to connect the binding rope to the paperclip (243). After the connection is completed, the spherical cover is closed. An alarm component (244) is installed on the top inner wall of the mounting bracket (1). When the safety module (5) is triggered, the alarm component (244) emits an audible and visual alarm.

4. A semi-trailer cargo box door lock according to claim 1, characterized in that, The locking mechanism (33) includes: A locking element (331) is installed on the right side of the roller frame (32), and the locking element (331) is arrow-shaped; The locking element (332) consists of a mounting plate, a locking block, and an unlocking block. The mounting plate is slidably mounted in a sliding cavity opened on the side wall of the mounting frame (1). A compression spring (333) is connected between the mounting plate and the sliding cavity. The locking block is mounted on the left side of the mounting plate. The left side of the locking block is inclined. The locking block is positioned corresponding to the locking element (331). The unlocking block is mounted on the right side of the mounting plate. The front side of the unlocking block is inclined. The unlocking component (334) is slidably mounted on the side wall of the mounting bracket (1). The position of the unlocking component (334) corresponds to that of the unlocking block. The outer end of the unlocking component (334) is connected to the pressing handle (227).

5. A semi-trailer cargo box door lock according to claim 1, characterized in that, The security module (5) includes: The safety roller (51) is rotatably mounted on the mounting bracket via a one-way bearing. The mounting bracket is slidably mounted on the hanger (1). An ejector spring is connected between the mounting bracket and the hanger (1). The surface of the safety roller (51) is provided with an anti-slip layer. The base (52) is mounted on the inner wall of the hanger (1) by means of an elastic telescopic rod; A clamping mechanism (53) is mounted on a base (52); A triangular block (54) is mounted on a roller frame (32). The right side of the triangular block (54) is an angled structure, and the left side of the base (52) is provided with an angled structure that cooperates with the triangular block (54).

6. A semi-trailer cargo box door lock according to claim 5, characterized in that, The clamping mechanism (53) includes: The structural plate (531) is rotatably mounted on the base (52) via a rotating shaft; The clamping plate (532) is slidably mounted on the structural plate (531). There are two clamping plates (532). A guide post is installed on the outer side of the clamping plate (532). The guide post is slidably mounted in the guide groove (521) opened on the inner wall of the base (52). The guide groove (521) is inclined. Gear (533), which is sleeved and installed on the outer circumference of the rotating shaft; A rack plate (534) is slidably disposed inside the base (52). A return spring is connected between the rack plate (534) and the base (52). The rack plate (534) meshes with the gear (533). An elastic element (535) is installed on the upper end of the rack plate (534). A snap-fit ​​groove (536) corresponding to the position of the elastic element (535) is provided on the mounting bracket.

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