A lifting device for semi-trailer container unloading

Abstract

The present application relates to container unloading device technical field, propose a kind of for semi-trailer container unloading spreader, comprising: lifting plate, lifting mechanism is arranged between lifting plate and the top of moving frame to lift lifting plate, two suspension mechanisms are symmetrically arranged in the bottom of lifting plate, translation mechanism is arranged on lifting plate, for adjusting the spacing between two suspension mechanisms.Suspension mechanism includes displacement installation component, support component and traction component, in the process of lifting container by suspension mechanism, the support plate on support component will automatically extend to the bottom of container body, support and protect container during suspension, greatly reduce the risk of container falling.And before container is about to land on the ground, the support plate can be separated from the bottom of container body by traction component, so that container can be smoothly unloaded, simple structure, ingenious design, improve the safety guarantee of container unloading work significantly.

Description

Technical Field

[0001] This invention relates to the field of container unloading equipment technology, specifically to a lifting device for unloading containers from semi-trailers. 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. Among them, the low-bed semi-trailer is a type of semi-trailer. Low-bed semi-trailers have no sideboards on the vehicle's loading side and are widely used, mainly for medium and long-distance freight transportation. They are usually used in conjunction with containers, and during the use of semi-trailers, unloading spreaders are required for unloading containers.

[0003] Existing unloading spreaders are prone to swaying between the fixing mechanism and the container during use, which reduces the docking accuracy of the fixing mechanism and the safety of the unloading operation. To address this, an existing patent (publication number: CN116812749B) discloses a spreader and unloading method for unloading containers from semi-trailers. The user can move the unloading frame 1 to the top of the semi-trailer container to be unloaded through the transfer mechanism 2. Then, the two first motors 33 can be started synchronously, which can drive the corresponding main synchronous pulley 34 to rotate. This, in turn, can drive the corresponding two auxiliary synchronous pulleys 37 to rotate through the corresponding synchronous belt 38. This can further drive the corresponding winding roller 36 to rotate, thereby unwinding the corresponding traction steel rope 39. This allows the lifting frame 31 to move downward under its own weight until the lifting frame 31 is tightly attached to the top of the container to be unloaded. At this time, the four fixing blocks 411 will be inserted into the locking holes at the four corners of the top of the container. Through the use of auxiliary mechanisms, it can fix the semi-trailer container a second time, thereby effectively improving the stability of unloading the semi-trailer container. It can also limit and guide the movement of the fixing mechanism and the semi-trailer container, thereby effectively improving the docking accuracy of the fixing mechanism.

[0004] However, the above solution still has some shortcomings: First, when raising and lowering the lifting frame 31, it is necessary to start two first motors 33 simultaneously to rotate the winding rollers 36, so as to wind and unwind the traction steel rope 39. However, during this process, since the winding rollers 36 have a certain length, when winding and unwinding the traction steel rope 39, the traction steel rope 39 will wind and unwind along the axis of the winding rollers 36. During this process, the winding and unwinding positions of the traction steel rope 39 on each winding roller 36 may deviate, which may easily lead to different lengths of the traction steel rope 39 suspending the lifting frame 31, resulting in different suspension forces at the four corners of the lifting frame 31, causing the lifting frame 31 to tilt during suspension. Second, similar to existing unloading spreaders, the unloading of containers is only achieved by suspending them through the locking holes on the containers. Once the rope breaks or the locking hole cracks, the container will instantly lose its balance and may fall and break, resulting in low safety.

[0005] In view of this, the present invention proposes a lifting device for unloading semi-trailer containers. Summary of the Invention

[0006] This invention proposes a spreader for unloading containers from semi-trailers, which solves the problem that existing unloading spreaders in related technologies only suspend containers by the locking holes on the containers. If the rope breaks or the locking hole breaks, the container will instantly lose its balance and may fall and be damaged, resulting in low safety.

[0007] The technical solution of the present invention is as follows: A spreader for unloading containers from a semi-trailer includes: a mobile frame and four mobile wheels respectively disposed at the four corners of the bottom end of the mobile frame; a lifting plate is disposed inside the mobile frame; a lifting mechanism for lifting the lifting plate is disposed between the lifting plate and the top of the mobile frame; two suspension mechanisms are symmetrically disposed at the bottom of the lifting plate; and a translation mechanism is disposed on the lifting plate for adjusting the distance between the two suspension mechanisms, thereby enabling the container placed on the semi-trailer transport plate to be suspended and installed through the two suspension mechanisms. The suspension mechanism includes a displacement mounting assembly, a support assembly, and a traction assembly. The support assembly includes a pallet for supporting the bottom of the container body. The displacement mounting assembly is located on the side of the container body and is used for suspending the support assembly. The traction assembly is located on one side of the displacement mounting assembly and is used for traction of the pallet, so that the pallet is pulled away from the bottom of the container body.

[0008] Preferably, the displacement installation assembly includes a lifting frame, a movable seat fixedly connected to the top of the lifting frame, T-shaped sliding rods fixedly connected to the top of the lifting frame on both sides of the movable seat, and plug-in posts that mate with the lock holes of the container body fixedly connected to the side wall of the lifting frame.

[0009] Preferably, a displacement groove is provided inside the lifting frame, a lifting plate is slidably sleeved inside the displacement groove, an installation cavity is provided through the lower side of the lifting plate, a plurality of guide rods are fixedly connected to the top of the displacement groove, the guide rods extend into the lifting plate and are slidably connected thereto, and a return spring is sleeved on the outside of the guide rods, the top and bottom ends of the return springs are fixedly connected to the displacement groove and the lifting plate respectively. The lifting plate has a T-shaped cross-section, and the displacement groove consists of two rectangular cavities, with the upper cavity being wider than the lower cavity.

[0010] Preferably, the support assembly further includes a fixed frame fixedly sleeved inside the mounting cavity, the support plate extends to the inside of the frame groove and is slidably connected thereto, a plurality of connecting springs are fixedly connected between the frame groove and the support plate, and a plurality of pulleys are rotatably connected to the end of the support plate away from the frame groove.

[0011] Preferably, the traction assembly includes a horizontal plate fixed to the side wall of the moving frame, a sliding plate provided on the lower side of the horizontal plate, a T-shaped rod fixed to the bottom end of the sliding plate, a T-shaped cavity for the T-shaped rod to slide in the bottom of the horizontal plate, an inner plate fixed to the bottom end of the sliding plate, and a vertical frame fixed to the top of the fixed frame. The inner plate extends into the interior of the vertical frame and is slidably connected to it.

[0012] Preferably, the traction assembly further includes an extension plate fixed to the side wall of the upright frame, a pull rope connected to the bottom end of the slide plate, a limit plate connected to the bottom end of the pull rope, the limit plate being mounted on the upper wall of the extension plate, a traction rope connected between the limit plate and the support plate, the traction rope sliding through the inside of the fixed frame and the extension plate, a guide wheel installed on the side wall of the upright frame, and the traction rope being sleeved on the outside of the guide wheel.

[0013] Preferably, the bottom of the lifting plate is provided with a transmission groove, and the bottom of the lifting plate on both sides of the transmission groove is provided with a T-shaped sliding groove. The number of T-shaped sliding grooves and T-shaped sliding rods are the same and correspond one-to-one. The T-shaped sliding rods and T-shaped sliding grooves are slidably fitted and connected.

[0014] Preferably, the translation mechanism includes a bidirectional lead screw rotatably connected inside the transmission groove. The bidirectional lead screw is divided into two sections along its axial direction, and the threads on the outer walls of the two sections of the bidirectional lead screw are in opposite directions. A first motor for rotating the bidirectional lead screw is installed on the side wall of the lifting plate. The bidirectional lead screw passes through the interior of the moving seat and is threadedly connected to it.

[0015] Preferably, the lifting mechanism includes a fixed plate fixed to the top of the movable frame. The fixed plate is arranged parallel to the lifting plate. The top four corners of the lifting plate are connected to the bottom of the fixed plate by telescopic rods. The telescopic rod includes an outer rod fixed to the top of the lifting plate and an inner rod fixed to the bottom of the fixed plate. The inner rod extends into the outer rod and is slidably connected to it.

[0016] Preferably, two internally threaded cylinders are symmetrically arranged at the bottom of the fixed plate. Both internally threaded cylinders are rotatably connected to the bottom of the fixed plate. A lead screw is threaded inside each of the two internally threaded cylinders. The bottom end of the lead screw is fixedly connected to the top end of the lifting plate. A worm gear is fixedly sleeved on the outer wall of each of the two internally threaded cylinders. Two hanging plates are fixedly connected to the bottom of the fixed plate. A shaft is rotatably connected between the two hanging plates. A second motor for rotating the shaft is installed on the outer wall of one of the hanging plates. Worms are fixedly sleeved at both ends of the shaft. The worms mesh with the worm gears.

[0017] The working principle and beneficial effects of this invention are as follows: In this invention, a lifting plate is provided inside the movable frame, and a lifting mechanism for raising and lowering the lifting plate is provided between the lifting plate and the top of the movable frame. Two suspension mechanisms are symmetrically arranged at the bottom of the lifting plate, and a translation mechanism is provided on the lifting plate for adjusting the distance between the two suspension mechanisms. The suspension mechanism includes a displacement mounting component, a support component, and a traction component. During the lifting of the container by the suspension mechanism, the pallet on the support component automatically extends to the bottom of the container body to support and protect the container during suspension, greatly reducing the risk of the container falling. Before the container is about to land, the traction component can pull the pallet away from the bottom of the container body, allowing the container to be unloaded smoothly. The structure is simple and the design ingenious, significantly improving the safety of container unloading. In this invention, a lifting plate is provided inside the movable frame, and a lifting mechanism for raising and lowering the lifting plate is provided between the lifting plate and the top of the movable frame. During operation, a second motor drives a shaft to rotate, which in turn drives two worm gears to rotate, thereby driving two worm wheels to rotate, which in turn drives two internal threaded cylinders to rotate. This allows the lead screw to move along the inner wall of the internal threaded cylinders, thus enabling the lifting plate to move stably downward. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the planar structure of a spreader for unloading semi-trailer containers proposed in this invention; Figure 2 This is a three-dimensional structural diagram of a lifting device for unloading semi-trailer containers proposed in this invention; Figure 3 This is a schematic diagram of the structural composition of the lifting mechanism proposed in this invention; Figure 4 This is a schematic diagram of the assembly structure of the translation mechanism and the lifting plate proposed in this invention; Figure 5 This is a three-dimensional structural diagram of the suspension mechanism proposed in this invention; Figure 6 This is a schematic diagram of the structural composition of the displacement mounting assembly proposed in this invention; Figure 7 This is a schematic diagram of the assembly structure of the support component and the traction component proposed in this invention; In the diagram: 1. Moving frame; 2. Translation mechanism; 21. First motor; 22. Double-acting lead screw; 3. Moving wheel; 4. Semi-trailer body transport plate; 5. Container body; 6. Suspension mechanism; 61. Displacement installation assembly; 611. Insertion column; 612. T-shaped slide bar; 613. Moving seat; 614. Lifting upright plate; 615. Installation cavity; 616. Guide rod; 617. Return spring; 618. Lifting frame; 619. Displacement groove; 62. Support assembly; 621. Pulley; 622. Pallet; 623. Fixed frame; 6 24. Connecting spring; 625. Frame groove; 63. Traction assembly; 631. Vertical frame; 632. Inner plate; 633. Horizontal plate; 634. Slide plate; 635. Pull rope; 636. Limiting plate; 637. Guide wheel; 638. Traction rope; 639. Extension plate; 7. Lifting plate; 71. T-shaped slide; 72. Transmission groove; 8. Lifting mechanism; 81. Fixed plate; 82. Telescopic rod; 83. Hanging plate; 84. Shaft; 85. Worm gear; 86. Worm wheel; 87. Second motor; 88. Lead screw; 89. Internal threaded cylinder. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1 Please see Figure 1 , Figure 2 as well as Figure 3 A spreader for unloading containers from a semi-trailer includes: a mobile frame 1 and four mobile wheels 3 respectively located at the four corners of the bottom of the mobile frame 1; a lifting plate 7 is provided inside the mobile frame 1; and a lifting mechanism 8 for lifting the lifting plate 7 is provided between the lifting plate 7 and the top of the mobile frame 1.

[0022] Specifically, the lifting mechanism 8 includes a fixed plate 81 fixed to the top of the movable frame 1. The fixed plate 81 is arranged parallel to the lifting plate 7. The top four corners of the lifting plate 7 are connected to the bottom of the fixed plate 81 by telescopic rods 82. The telescopic rod 82 includes an outer rod fixed to the top of the lifting plate 7 and an inner rod fixed to the bottom of the fixed plate 81. The inner rod extends into the outer rod and is slidably connected to it. Two internally threaded cylinders 89 are symmetrically arranged at the bottom of the fixed plate 81. Both internally threaded cylinders 89 are rotatably connected to the bottom of the fixed plate 81. Both internally threaded cylinders 89 are threadedly connected to a lead screw 88. The bottom end of the lead screw 88 is fixedly connected to the top end of the lifting plate 7. Worm gears 86 are fixedly sleeved on the outer wall of both internally threaded cylinders 89. Two hanging plates 83 are fixedly connected to the bottom end of the fixed plate 81. A shaft 84 is rotatably connected between the two hanging plates 83. A second motor 87 for rotating the shaft 84 is installed on the outer wall of one of the hanging plates 83. Worms 85 are fixedly sleeved at both ends of the shaft 84. The worm gears 85 mesh with the worm gears 86.

[0023] The working principle of this embodiment is as follows: The second motor 87 is started, which drives the shaft 84 to rotate. The shaft 84 drives the two worm gears 85 to rotate, which in turn drives the two worm wheels 86 to rotate, which in turn drives the two internal threaded cylinders 89 to rotate. This allows the lead screw 88 to move along the inner wall of the internal threaded cylinder 89, thereby moving the position of the lifting plate 7 downward.

[0024] Example 2 Please see Figure 1 , Figure 2 , Figure 4 as well as Figure 6 Two suspension mechanisms 6 are symmetrically arranged at the bottom of the lifting plate 7. A translation mechanism 2 is provided on the lifting plate 7 to adjust the distance between the two suspension mechanisms 6, so that the container body 5 placed on the semi-trailer transport plate 4 can be suspended and installed through the two suspension mechanisms 6.

[0025] Furthermore, a transmission groove 72 is provided at the bottom of the lifting plate 7, and T-shaped sliding grooves 71 are provided at the bottom of the lifting plate 7 on both sides of the transmission groove 72. The number of T-shaped sliding grooves 71 and T-shaped sliding rods 612 are the same and correspond one-to-one. The T-shaped sliding rods 612 and T-shaped sliding grooves 71 are slidably fitted and connected.

[0026] Furthermore, the translation mechanism 2 includes a bidirectional lead screw 22 rotatably connected inside the transmission groove 72. The bidirectional lead screw 22 is divided into two sections along its axial direction. The threads on the outer walls of the two bidirectional lead screw sections 22 are in opposite directions. A first motor 21 that rotates the bidirectional lead screw 22 is installed on the side wall of the lifting plate 7. The bidirectional lead screw 22 passes through the movable seat 613 on the suspension mechanism 6 and is threadedly connected to it.

[0027] The working principle of this embodiment is as follows: After the movable frame 1 is positioned across both sides of the semi-trailer transport plate 4 via the movable wheels 3, the first motor 21 is started to rotate the double-acting screw 22, allowing the movable seat 613 to move along the outer wall of the double-acting screw 22, thereby adjusting the relative distance between the two suspension mechanisms 6. The two suspension mechanisms 6 are then brought closer together to clamp the container body 5.

[0028] Example 3 Please see Figure 1 , Figure 2 , Figure 5 , Figure 6 as well as Figure 7 The suspension mechanism 6 includes a displacement mounting assembly 61, a support assembly 62, and a traction assembly 63. The support assembly 62 includes a pallet 622 for supporting the bottom of the container body 5. The displacement mounting assembly 61 is located on the side of the container body 5 and is used for suspending the support assembly 62. The traction assembly 63 is located on one side of the displacement mounting assembly 61 and is used for traction of the pallet 622, so that the pallet 622 is pulled away from the bottom of the container body 5.

[0029] Furthermore, the displacement mounting assembly 61 includes a lifting frame 618, with a movable seat 613 fixedly connected to the top of the lifting frame 618. T-shaped sliding rods 612 are fixedly connected to the top of the lifting frame 618 on both sides of the movable seat 613. Insertion posts 611 that mate with the locking holes of the container body 5 are fixedly connected to the side wall of the lifting frame 618. A displacement groove 619 is provided inside the lifting frame 618. A lifting plate 614 is slidably fitted inside the displacement groove 619. An installation cavity 615 is provided through the lower side of the lifting plate 614. Several guide rods 616 are fixedly connected to the top of the displacement groove 619. The guide rods 616 extend into the lifting plate 614 and are slidably connected to it. A return spring 617 is fitted outside the guide rods 616. The top and bottom ends of the return spring 617 are fixedly connected to the displacement groove 619 and the lifting plate 614, respectively. The lifting plate 614 has a T-shaped cross-section, and the displacement groove 619 consists of two rectangular cavities. The width of the upper cavity is greater than that of the lower cavity, ensuring that the lifting plate 614 will not completely detach from the displacement groove 619.

[0030] In addition, the support assembly 62 also includes a fixed frame 623 fixedly sleeved inside the mounting cavity 615, a support plate 622 extending to the inside of the frame groove 625 and slidably connected thereto, a number of connecting springs 624 fixedly connected between the frame groove 625 and the support plate 622, and a number of pulleys 621 rotatably connected to the end of the support plate 622 away from the frame groove 625.

[0031] Furthermore, the traction assembly 63 includes a horizontal plate 633 fixed to the side wall of the movable frame 1, a sliding plate 634 provided on the lower side of the horizontal plate 633, a T-shaped rod fixed to the bottom end of the sliding plate 634, a T-shaped cavity for the T-shaped rod to slide in the bottom of the horizontal plate 633, an inner plate 632 fixed to the bottom end of the sliding plate 634, and a vertical frame 631 fixed to the top of the fixed frame 623. The inner plate 632 extends into the interior of the vertical frame 631 and is slidably connected to it. The traction assembly 63 also includes an extension plate 639 fixed to the side wall of the upright frame 631. A pull rope 635 is connected to the bottom end of the slide plate 634. A limiting plate 636 is connected to the bottom end of the pull rope 635. The limiting plate 636 is mounted on the upper wall of the extension plate 639. A traction rope 638 is connected between the limiting plate 636 and the support plate 622. The traction rope 638 slides through the fixed frame 623 and the interior of the extension plate 639. A guide wheel 637 is installed on the side wall of the upright frame 631. The traction rope 638 is sleeved on the outside of the guide wheel 637.

[0032] The working principle of this embodiment is as follows: As the two suspension mechanisms 6 approach each other, the pallet 622 is squeezed against the container body 5, causing the pallet 622 to gradually retract into the frame groove 625, compressing the connecting spring 624. The traction rope 638 located inside the frame groove 625 twists. However, due to the friction between the traction rope 638 and the fixed frame 623, the portion of the traction rope 638 located outside the fixed frame 623 retains its shape. Next, the lifting mechanism 8 lowers the position of the lifting plate 7. During this process, the displacement mounting component 61 drives the support component 62 to move downwards, and the pallet 622 slides down the outer wall of the container body 5 via the pulley 621. When the bottom of the suspension mechanism 6 contacts the top of the semi-trailer transport plate 4, as the lifting plate 7 continues to move downwards, the lifting upright plate 614 will slide into the displacement groove 619, compressing the return spring 617 until the insertion post 611 is exactly located on one side of the lock hole of the container body 5. This brings the two suspension mechanisms 6 closer to each other, so that the insertion post 611 is exactly inserted into the lock hole of the container body 5.

[0033] The working principle and usage process of this invention are as follows: During operation, the movable frame 1 is positioned across both sides of the semi-trailer transport plate 4 via the movable wheels 3. Then, the first motor 21 is started to rotate the double-acting screw 22, allowing the movable seat 613 to move along the outer wall of the double-acting screw 22, thereby adjusting the relative distance between the two suspension mechanisms 6. The two suspension mechanisms 6 are brought closer together to clamp the container body 5. During this process, the pallet 622 is squeezed against the container body 5, causing the pallet 622 to gradually retract into the inner side of the frame groove 625, compressing the connecting spring 624. The traction rope 638 located inside the frame groove 625 twists, but due to the friction between the traction rope 638 and the fixed frame 623, the portion of the traction rope 638 located outside the fixed frame 623 retains its shape.

[0034] Next, the lifting mechanism 8 lowers the position of the lifting plate 7. Specifically, the second motor 87 is started, which drives the shaft 84 to rotate. The shaft 84 drives the two worm gears 85 to rotate, which in turn drives the two worm wheels 86 to rotate, which in turn drives the two internal threaded cylinders 89 to rotate. This allows the lead screw 88 to move along the inner wall of the internal threaded cylinder 89, thus allowing the lifting plate 7 to continue to move downward. During this process, the displacement mounting assembly 61 drives the support assembly 62 to move downward. The support plate 622 slides down the outer wall of the container body 5 via the pulley 621. When the bottom of the suspension mechanism 6 contacts the top of the semi-trailer transport plate 4, as the lifting plate 7 continues to move downward, the lifting upright plate 614 slides into the displacement groove 619, compressing the return spring 617 until the insertion post 611 is exactly located on one side of the lock hole of the container body 5. At this point, the two suspension mechanisms 6 are brought closer together, so that the insertion post 611 is inserted into the lock hole of the container body 5. It should be noted that the pull rope 635 is still in a bent state at this time.

[0035] After the plug-in post 611 is inserted into the lock hole of the container body 5, the lifting mechanism 8 raises the lifting plate 7. The lifting plate 7 drives the displacement mounting component 61 to rise. Since the return spring 617 is in a compressed state at this time, the lifting plate 614 remains in a fixed position when the lifting frame 618 rises. When the bottom height of the container body 5 is higher than the pallet 622, the connecting spring 624, which was originally in a compressed state, will drive the pallet 622 to extend out of the fixed frame 623, so that the pallet 622 is located at the bottom of the container body 5 and supports the bottom of the container body 5.

[0036] Next, the mobile frame 1, along with the container body 5 suspended by the suspension mechanism 6, is moved out of the semi-trailer transport platform 4. Then, the lifting platform 7 is lowered by the lifting mechanism 8, allowing the container body 5 to be lowered. This allows the displacement installation component 61 to drive the support component 62 to move down, and the support component 62 to drive the upright frame 631 to move down. When the container body 5 is about to land, the pull rope 635 is taut. At this time, as the upright frame 631 continues to move down, the pull rope 635 will pull the traction rope 638, which in turn pulls the pallet 622, causing the pallet 622 to retract into the fixed frame 623. In other words, the pallet 622 is pulled away from the bottom of the container body 5, allowing the container body 5 to land smoothly on the ground.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A spreader for unloading containers from semi-trailers, comprising: The mobile frame and four wheels respectively located at the four corners of the bottom of the mobile frame are characterized in that a lifting plate is provided inside the mobile frame, a lifting mechanism for lifting the lifting plate is provided between the lifting plate and the top of the mobile frame, two suspension mechanisms are symmetrically arranged at the bottom of the lifting plate, and a translation mechanism is provided on the lifting plate for adjusting the distance between the two suspension mechanisms, so that the container placed on the semi-trailer transport plate can be suspended and installed through the two suspension mechanisms; The suspension mechanism includes a displacement mounting assembly, a support assembly, and a traction assembly. The support assembly includes a pallet for supporting the bottom of the container body. The displacement mounting assembly is located on the side of the container body and is used for suspending the support assembly. The traction assembly is located on one side of the displacement mounting assembly and is used for traction of the pallet, so that the pallet is pulled away from the bottom of the container body. The displacement installation assembly includes a lifting frame, a movable seat fixed to the top of the lifting frame, T-shaped sliding rods fixed to the top of the lifting frame on both sides of the movable seat, and plug-in posts that mate with the lock holes of the container body fixed to the side wall of the lifting frame. A displacement groove is provided inside the lifting frame, and a lifting plate is slidably sleeved inside the displacement groove. An installation cavity is provided through the lower side of the lifting plate. Several guide rods are fixedly connected to the top of the displacement groove. The guide rods extend into the lifting plate and are slidably connected to it. A return spring is sleeved on the outside of the guide rods. The top and bottom ends of the return springs are fixedly connected to the displacement groove and the lifting plate, respectively. The lifting plate has a T-shaped cross-section, and the displacement groove consists of two rectangular cavities, with the upper cavity being wider than the lower cavity. The support assembly also includes a fixed frame that is fixedly sleeved inside the mounting cavity. The support plate extends to the inside of the frame groove and is slidably connected thereto. Several connecting springs are fixedly connected between the frame groove and the support plate. Several pulleys are rotatably connected to the end of the support plate away from the frame groove. The traction assembly includes a horizontal plate fixed to the side wall of the mobile frame, a sliding plate provided on the lower side of the horizontal plate, a T-shaped rod fixed to the bottom end of the sliding plate, a T-shaped cavity for the T-shaped rod to slide in the bottom of the horizontal plate, an inner plate fixed to the bottom end of the sliding plate, and a vertical frame fixed to the top of the fixed frame. The inner plate extends into the interior of the vertical frame and is slidably connected to it. The traction assembly also includes an extension plate fixed to the side wall of the upright frame, a pull rope connected to the bottom end of the slide plate, a limit plate connected to the bottom end of the pull rope, the limit plate being mounted on the upper wall of the extension plate, a traction rope connected between the limit plate and the support plate, the traction rope sliding through the inside of the fixed frame and the extension plate, a guide wheel installed on the side wall of the upright frame, and the traction rope being sleeved on the outside of the guide wheel. During operation, the two suspension mechanisms are brought close together to clamp the container body. As the two suspension mechanisms approach each other, the pallet is squeezed against the container body, causing the pallet to gradually retract into the frame groove. Then, the lifting mechanism lowers the position of the lifting plate, and the displacement mounting component moves the position of the support component downward. The pallet slides down the outer wall of the container body through the pulley. When the bottom of the suspension mechanism contacts the top of the semi-trailer body transport plate, as the lifting plate continues to move downward, the lifting plate slides into the displacement groove, compressing the return spring until the insertion post is exactly located on one side of the container body lock hole. At this point, the two suspension mechanisms are brought close together so that the insertion post is inserted into the container body lock hole. After the plug-in column is inserted into the lock hole of the container body, the lifting mechanism raises the lifting plate. The lifting plate drives the displacement installation component to rise. Since the return spring is in a compressed state at this time, the lifting plate remains in a fixed position when the lifting frame rises. When the bottom of the container body is higher than the pallet, the connecting spring, which was originally in a compressed state, will drive the pallet to extend out of the fixed frame, so that the pallet is located at the bottom of the container body and supports the bottom of the container body. Next, the mobile frame, along with the container suspended by the suspension mechanism, is moved off the semi-trailer's transport platform. Then, the lifting mechanism lowers the lifting platform, allowing the container to be lowered. This allows the displacement installation component to move the support component down, which in turn moves the upright frame down. As the container is about to land, the pull rope is taut. At this point, as the upright frame continues to move down, the pull rope pulls the traction rope, which in turn pulls the pallet, causing the pallet to retract into the fixed frame. In other words, the pallet is pulled away from the bottom of the container, allowing the container to land smoothly on the ground.

2. The spreader for unloading semi-trailer containers according to claim 1, characterized in that, The bottom of the lifting plate is provided with a transmission groove, and the bottom of the lifting plate on both sides of the transmission groove is provided with a T-shaped sliding groove. The number of T-shaped sliding grooves and T-shaped sliding rods are the same and correspond one-to-one. The T-shaped sliding rods are slidably fitted and connected to the T-shaped sliding grooves.

3. A lifting device for unloading semi-trailer containers according to claim 2, characterized in that, The translation mechanism includes a bidirectional lead screw rotatably connected inside the transmission groove. The bidirectional lead screw is divided into two sections along its axial direction. The threads on the outer walls of the two bidirectional lead screw sections are in opposite directions. A first motor for rotating the bidirectional lead screw is installed on the side wall of the lifting plate. The bidirectional lead screw passes through the interior of the moving seat and is threadedly connected to it.

4. A spreader for unloading semi-trailer containers according to claim 3, characterized in that, The lifting mechanism includes a fixed plate fixed to the top of the movable frame. The fixed plate is arranged parallel to the lifting plate. The top four corners of the lifting plate are connected to the bottom of the fixed plate by telescopic rods. The telescopic rod includes an outer rod fixed to the top of the lifting plate and an inner rod fixed to the bottom of the fixed plate. The inner rod extends into the outer rod and is slidably connected to it.

5. A spreader for unloading semi-trailer containers according to claim 4, characterized in that, Two internally threaded cylinders are symmetrically arranged at the bottom of the fixed plate. Both internally threaded cylinders are rotatably connected to the bottom of the fixed plate. A lead screw is threaded inside each of the two internally threaded cylinders. The bottom end of the lead screw is fixedly connected to the top end of the lifting plate. A worm gear is fixedly sleeved on the outer wall of each of the two internally threaded cylinders. Two hanging plates are fixedly connected to the bottom of the fixed plate. A shaft is rotatably connected between the two hanging plates. A second motor for rotating the shaft is installed on the outer wall of one of the hanging plates. Worms are fixedly sleeved at both ends of the shaft. The worms mesh with the worm gears.

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