Self-locking lifting device for cargo transfer of freight trailer

Abstract

The utility model provides a self-locking lifting device for cargo transfer of a freight trailer, and belongs to the technical field of transfer equipment in a trailer compartment. The trailer comprises a trailer compartment, a self-locking lifting appliance mechanism and a multidirectional transfer mechanism connected with the self-locking lifting appliance mechanism are arranged at the top in the trailer compartment, and the multidirectional transfer mechanism comprises a moving beam and a first translation assembly capable of driving the moving beam to translate in the length direction of the trailer compartment. The self-locking type lifting appliance mechanism can be used for lifting goods, then the goods can be moved to any position in the trailer compartment through the multi-directional transferring mechanism, the self-locking type lifting appliance mechanism can achieve self-locking after the goods are lifted, the goods cannot shake in the moving process, and therefore the situation that the goods are damaged can be prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of transport equipment in trailer compartments and relates to a self-locking hanging device for transporting goods on freight trailers. Background Art

[0002] Freight trailers with closed compartments have a large cargo capacity and a long compartment, so manual handling is time-consuming and labor-intensive when loading and unloading goods. The current slings used in the compartment that are raised and lowered by chains will shake when moving goods, which can easily cause damage to the goods.

[0003] For example, a Chinese patent discloses a semitrailer capable of self-loading and unloading goods [application number: 201310634418.3], which includes a liftable traction pin, a frame, liftable independent suspension wheels, an upper clamp, a lower clamp, a tailgate, and a transverse connection device. The frame consists of a front frame and two rear frames, and the space between the rear frames is a component-free space, and a flange for a self-loading and unloading special pallet is set at the bottom of the inner side. The height of the frame can be raised or lowered by manipulating the liftable traction pin at the bottom of the front frame and the multiple liftable independent suspension wheels at the lower rear of the rear frame. A rotatable transverse connection device is set in the middle of the rear frame. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems and provide a self-locking hanging device for cargo transfer on a freight trailer.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A self-locking lifting device for cargo transfer on a freight trailer comprises a trailer compartment, wherein a self-locking lifting device mechanism and a multi-directional transfer mechanism connected to the self-locking lifting device mechanism are arranged on the top of the trailer compartment, wherein the multi-directional transfer mechanism comprises a moving beam and a No. 1 translation component capable of driving the moving beam to translate along the length direction of the trailer compartment, wherein a translation slider and a No. 2 translation component capable of driving the translation slider to translate along the width direction of the trailer compartment are arranged on the moving beam, and the self-locking lifting device mechanism is arranged on the translation slider.

[0007] In the above-mentioned self-locking lifting device for cargo transfer on freight trailers, the self-locking lifting device mechanism includes a rotation limit plate, a rotating plate and a lifting plate with two hooks at the bottom, the rotation limit plate is fixed on the translation slider, the translation slider is provided with a rotating component connected to the rotating plate, a rotation limit component and a rotation locking component are provided between the rotation limit plate and the rotating plate, and the rotating plate is also provided with a lifting component connected to the lifting plate.

[0008] In the above-mentioned self-locking lifting device for cargo transfer on a freight trailer, the rotating assembly includes a rotating driver arranged in a translation slider, and the output shaft of the rotating driver passes through the rotating limit plate and is connected to the rotating plate.

[0009] In the above-mentioned self-locking lifting device for cargo transfer on freight trailers, the output shaft end of the rotating driver is provided with a bearing mounting portion recessed inwardly, and a bearing with an inner ring inserted into the bearing mounting portion is provided in the rotating plate. A limiting pressure plate is also fixed to the rotating plate by a plurality of bolts, and the inner end of the limiting pressure plate abuts against the outer side of the outer ring of the bearing.

[0010] In the above-mentioned self-locking lifting device for cargo transfer on a freight trailer, the rotation limit assembly includes an annular limit groove recessed inwardly on the rotation limit plate, and two rotation limit rods inserted into the annular limit groove are symmetrically arranged on the rotation plate.

[0011] In the above-mentioned self-locking lifting device for cargo transfer on freight trailers, the rotation locking assembly includes an annular plate mounting chamber arranged in a rotation limit plate, the annular plate mounting chamber is arranged directly above the annular limit groove and the bottom is connected to the annular limit groove, an annular plate is arranged in the annular plate mounting chamber, and a rotation self-locking structure is arranged at the bottom of the annular plate, which can be inserted into the annular limit groove and lock the rotation limit rod, and the rotation self-locking structure includes a plurality of telescopic rods arranged along the circumferential direction, and the rotation limit plate is also symmetrically provided with two lifting drives connected to the annular plate, which can drive the annular plate to move downward so that the telescopic end of the telescopic rod is inserted into the annular limit groove to lock the rotation limit rod.

[0012] In the above-mentioned self-locking lifting device for cargo transfer on freight trailers, the lifting assembly includes two rope installation boxes symmetrically arranged on both sides of a rotating plate, a rotating drum driven by a motor is arranged in the rope installation box, a rope connected to the lifting plate is fixedly wound around the rotating drum, and a positioning structure is also provided between the rotating plate and the lifting plate.

[0013] In the above-mentioned self-locking lifting device for cargo transfer on a freight trailer, the positioning structure includes two positioning grooves corresponding to the pull rope installation box, and two positioning rods corresponding to the positioning grooves are protruding from the top of the lifting plate. A guide wheel is also provided in the positioning groove, and the pull rope is wrapped around the guide wheel and fixedly connected to the top of the positioning rod. The cross-sections of the positioning groove and the positioning rod are both circular and an open portion is also provided at the bottom of the positioning groove.

[0014] In the above-mentioned self-locking lifting device for cargo transfer in freight trailers, the top of the trailer compartment is also provided with an inwardly recessed No. 1 slide groove, the movable beam is arranged in the No. 1 slide groove, the No. 1 translation assembly includes a No. 1 screw rod arranged along the length direction of the trailer compartment and a No. 1 translation driver capable of driving the No. 1 screw rod to rotate, the No. 1 screw rod and the movable beam are screwed together, and translation limit rods slidingly cooperating with the movable beam are also provided on both sides of the No. 1 slide groove.

[0015] In the above-mentioned self-locking lifting device for cargo transfer of freight trailers, the bottom of the movable beam is recessed inwardly to provide a No. 2 slide groove, the top of the translation slider is inserted into the No. 2 slide groove, the No. 2 translation assembly includes a No. 2 screw rod arranged along the width direction of the trailer compartment and a No. 2 translation driver capable of driving the No. 2 screw rod to rotate, and the No. 2 screw rod and the translation slider rod are threadedly connected.

[0016] Compared with the existing technology, the advantages of the utility model are:

[0017] 1. The self-locking sling mechanism can be used to lift the goods, and then the goods can be moved to any position in the trailer compartment through the multi-directional transfer mechanism. The self-locking sling mechanism can self-lock after lifting the goods, and the goods will not shake when moving, thereby preventing damage to the goods.

[0018] 2. The No. 2 translation component can be used to drive the translation slider to translate along the width direction of the trailer compartment, and the No. 1 translation component can be used to drive the moving beam to translate along the length direction of the trailer compartment, thereby realizing multi-directional movement of goods in the trailer compartment.

[0019] 3. The lifting assembly cooperates with the lifting plate with a hook to lift or lower the goods. The rotating assembly can drive the rotating plate and the lifting plate connected to the rotating plate to rotate, so as to facilitate the adjustment of the placement of the goods in the trailer compartment. The rotating limit assembly can limit the rotating plate when the rotating plate rotates. After the rotating plate completes the rotation, the rotating locking assembly can lock the rotating plate to prevent the rotating plate from rotating during the movement of the goods.

[0020] 4. After the annular plate moves downward, the telescopic end of the telescopic rod abutting against the rotation limit rod will be squeezed and contracted, and the telescopic end of the telescopic rod abutting against the rotation limit rod is inserted into the annular limit groove to lock the rotation limit rod, so that the rotating plate cannot rotate. The above structure can ensure that the rotating plate can be locked when the rotating plate is rotated to any angle, rather than being limited to specific angles. When the rotating plate needs to rotate, the annular plate moves upward to the telescopic end of the telescopic rod and disengages from the annular limit groove, and the lifting drive can drive the annular plate to rise and fall in the vertical direction.

[0021] 5. The motor drives the rotation to realize the retraction and release of the pull rope, thereby realizing the lifting and lowering of the lifting platform. The positioning structure can fix the lifting platform after the goods are lifted to prevent shaking during the transportation of goods. When the lifting platform rises to the highest point, the positioning rod can be inserted into the positioning groove. The positioning rod and the positioning groove can lock the lifting platform. The open part at the bottom of the positioning groove can facilitate the insertion of the positioning rod into the positioning groove.

[0022] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model;

[0024] Figure 2 It is a structural diagram of a self-locking sling mechanism;

[0025] Figure 3 It is a structural schematic diagram of the rotating limit plate;

[0026] Figure 4 It is a schematic diagram of the structure at the annular plate;

[0027] Figure 5 It is a structural diagram of the multi-directional transport mechanism;

[0028] Figure 6 yes Figure 2 A magnified schematic diagram of center A.

[0029] In the figure, trailer carriage 1, self-locking hoisting device mechanism 2, multi-directional transfer mechanism 3, moving beam 4, No. 1 translation component 5, translation slider 6, No. 2 translation component 7, rotation limit plate 8, rotating plate 9, hook 10, lifting plate 11, rotation driver 12, bearing mounting part 13, bearing 14, limit pressure plate 15, annular limit groove 16, rotation limit rod 17, annular plate mounting chamber 18, annular plate 19, telescopic rod 20, lifting driver 21, pull rope mounting box 22, rotating drum 23, pull rope 24, positioning groove 25, positioning rod 26, guide wheel 27, open part 28, No. 1 slide groove 29, No. 1 screw 30, No. 1 translation driver 31, translation limit rod 32, No. 2 slide groove 33, No. 2 screw 34, No. 2 translation driver 35. DETAILED DESCRIPTION

[0030] like Figure 1 , Figure 2 and Figure 5As shown, a self-locking lifting device for cargo transfer on a freight trailer includes a trailer compartment 1, a self-locking lifting device mechanism 2 and a multi-directional transfer mechanism 3 connected to the self-locking lifting device mechanism 2 are arranged on the top of the trailer compartment 1, the multi-directional transfer mechanism 3 includes a moving beam 4 and a No. 1 translation component 5 that can drive the moving beam 4 to translate along the length direction of the trailer compartment 1, the moving beam 4 is provided with a translation slider 6 and a No. 2 translation component 7 that can drive the translation slider 6 to translate along the width direction of the trailer compartment 1, and the self-locking lifting device mechanism 2 is arranged on the translation slider 6.

[0031] In the utility model, the self-locking sling mechanism 2 can be used to lift the goods, and then the goods can be moved to any position in the trailer compartment through the multi-directional transfer mechanism 3. The self-locking sling mechanism 2 can be self-locked after lifting the goods, and the goods will not shake during the movement, thereby preventing the goods from being damaged;

[0032] The No. 2 translation component 7 can drive the translation slider 6 to translate along the width direction of the trailer compartment 1, and the No. 1 translation component 5 can drive the moving beam 4 to translate along the length direction of the trailer compartment 1, thereby realizing multi-directional movement of goods in the trailer compartment.

[0033] Specifically, the self-locking sling mechanism 2 includes a rotation limit plate 8, a rotation plate 9, and a lifting plate 11 with two hooks 10 at the bottom. The rotation limit plate 8 is fixed on the translation slider 6. The translation slider 6 is provided with a rotation component connected to the rotation plate 9. A rotation limit component and a rotation locking component are provided between the rotation limit plate 8 and the rotation plate 9. The rotation plate 9 is also provided with a lifting component connected to the lifting plate 11. The lifting component cooperates with the lifting plate 11 with a hook to lift or lower the goods. The rotation component can drive the rotation plate 9 and the lifting plate connected to the rotation plate to rotate so as to facilitate the adjustment of the placement of the goods in the trailer compartment. The rotation limit component can limit the rotation plate when the rotation plate rotates. After the rotation plate completes the rotation, the rotation locking component can lock the rotation plate to prevent the rotation of the rotation plate during the movement of the goods.

[0034] Specifically, the rotating assembly includes a rotating driver 12 disposed in the translation slider 6, and the output shaft of the rotating driver 12 passes through the rotating stop plate 8 and is connected to the rotating plate 9. The rotating driver can drive the rotating plate to rotate. Those skilled in the art should understand that the rotating driver can be a rotating cylinder or a motor, etc.

[0035] Preferably, combined Figure 2 and Figure 6As shown, the output shaft end of the rotary driver 12 is provided with an inwardly recessed bearing mounting portion 13, the rotary plate 9 is provided with a bearing 14 whose inner ring is inserted into the bearing mounting portion 13, and the rotary plate 9 is also fixed with a limit pressure plate 15 by a plurality of bolts, and the inner end of the limit pressure plate 15 abuts against the outer side of the outer ring of the bearing 14. The above structure can realize the fixing of the output shaft of the rotary driver and the rotary plate, and can facilitate the disassembly of the output shaft of the rotary driver and the rotary plate.

[0036] Specifically, combined with Figure 2-Figure 4 As shown, the rotation limit assembly includes an annular limit groove 16 recessed inwardly on the rotation limit plate 8, and two rotation limit rods 17 inserted into the annular limit groove 16 are symmetrically arranged on the rotation plate 9. The rotation limit rods 17 cooperate with the annular limit groove to limit the rotation plate when the rotation plate rotates.

[0037] Specifically, combined with Figure 2-Figure 4 As shown, the rotation locking assembly includes an annular plate mounting chamber 18 arranged in the rotation limit plate 8, the annular plate mounting chamber 18 is arranged directly above the annular limit groove 16 and the bottom is connected to the annular limit groove 16, an annular plate 19 is arranged in the annular plate mounting chamber 18, and a rotation self-locking structure which can be inserted into the annular limit groove 16 and lock the rotation limit rod 17 is arranged at the bottom of the annular plate 19, the rotation self-locking structure includes a plurality of telescopic rods 20 arranged along the circumferential direction, and two lifting drivers 21 connected to the annular plate 19 are symmetrically arranged on the rotation limit plate 8, and the lifting driver 21 can drive the annular plate 19 to move downward so that the telescopic end of the telescopic rod 20 is inserted into the annular limit groove 16 to lock the rotation limit rod 17. After the annular plate moves downward, the telescopic end of the telescopic rod that abuts the rotation limit rod will be squeezed and contracted, and the telescopic end of the telescopic rod located at the rotation limit rod is inserted into the annular limit groove to lock the rotation limit rod, so that the rotating plate cannot rotate. The above structure can ensure that the rotating plate can be locked when it is rotated to any angle, rather than being limited to a few specific angles. When the rotating plate needs to rotate, the annular plate moves upward to the telescopic end of the telescopic rod and disengages from the annular limit groove, and the lifting drive 21 can drive the annular plate to rise and fall in the vertical direction.

[0038] Those skilled in the art should understand that the lifting drive may be an oil cylinder, an air cylinder or a linear motor, etc.

[0039] Specifically, combined with Figure 2As shown, the lifting assembly includes two rope installation boxes 22 symmetrically arranged on both sides of the rotating plate 9, and a rotating drum 23 driven by a motor is arranged in the rope installation box 22. A rope 24 connected to the lifting plate 11 is fixedly wound around the rotating drum 23, and a positioning structure is also arranged between the rotating plate 9 and the lifting plate 11. The motor drives the rope to rotate and retract, thereby realizing the lifting and lowering of the lifting plate. The positioning structure can fix the lifting plate after the goods are lifted to prevent shaking during the transportation of the goods.

[0040] Specifically, the positioning structure includes two positioning grooves 25 corresponding to the pull rope installation box 22, and two positioning rods 26 corresponding to the positioning grooves 25 are protruding from the top of the lifting plate 11. A guide wheel 27 is also provided in the positioning groove 25. The pull rope 24 is passed through the guide wheel 27 and is fixedly connected to the top of the positioning rod 26. The cross-sections of the positioning groove 25 and the positioning rod 26 are both circular, and an open portion 28 is also provided at the bottom of the positioning groove 25. When the lifting plate rises to the highest point, the positioning rod can be inserted into the positioning groove, and the positioning rod and the positioning groove can be used to lock the lifting plate. The open portion 28 at the bottom of the positioning groove 25 can facilitate the insertion of the positioning rod into the positioning groove.

[0041] Specifically, combined with Figure 1 and Figure 5 As shown, the top of the trailer compartment 1 is also provided with a No. 1 slide groove 29 which is recessed inwards, the moving beam 4 is arranged in the No. 1 slide groove 29, the No. 1 translation assembly 5 includes a No. 1 screw rod 30 arranged along the length direction of the trailer compartment 1 and a No. 1 translation driver 31 which can drive the No. 1 screw rod 30 to rotate, the No. 1 screw rod 30 is screwed to the moving beam 4, and the No. 1 slide groove 29 is also provided with a translation limit rod 32 which is slidably matched with the moving beam 4 on both sides. The No. 1 translation driver 31 can drive the No. 1 screw rod 30 to rotate, and the rotation of the No. 1 screw rod can drive the moving beam to translate along the length direction of the trailer compartment, and the translation limit rod can limit the moving beam.

[0042] Those skilled in the art should understand that the first translation driver may be a rotary cylinder or a motor, etc.

[0043] Specifically, combined with Figure 1 and Figure 5 As shown, the bottom of the moving beam 4 is inwardly recessed to be provided with a No. 2 slide groove 33, the top end of the translation slider 6 is inserted into the No. 2 slide groove 33, the No. 2 translation assembly 7 includes a No. 2 screw rod 34 arranged along the width direction of the trailer compartment 1 and a No. 2 translation driver 35 capable of driving the No. 2 screw rod 34 to rotate, and the No. 2 screw rod 34 and the translation slider 6 are screwed. The No. 2 translation driver 35 can drive the No. 2 screw rod 34 to rotate, and the rotation of the No. 2 screw rod can drive the translation slider to translate along the width direction of the trailer compartment.

[0044] Those skilled in the art should understand that the second translation driver 35 can be a rotary cylinder or a motor, etc.

[0045] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0046] Although this article uses more trailer carriage 1, self-locking sling mechanism 2, multi-directional transfer mechanism 3, moving beam 4, No. 1 translation component 5, translation slider 6, No. 2 translation component 7, rotation limit plate 8, rotation plate 9, hook 10, lifting plate 11, rotation drive 12, bearing mounting part 13, bearing 14, limit pressure plate 15, annular limit groove 16, rotation limit rod 17, annular plate installation chamber 18, annular plate 19, telescopic rod 20, lifting drive 21, The rope installation box 22, the rotating drum 23, the rope 24, the positioning groove 25, the positioning rod 26, the guide wheel 27, the open portion 28, the No. 1 slide groove 29, the No. 1 screw rod 30, the No. 1 translation driver 31, the translation limit rod 32, the No. 2 slide groove 33, the No. 2 screw rod 34, the No. 2 translation driver 35, etc., these terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A self-locking lifting device for cargo transfer on a freight trailer, comprising a trailer compartment (1), characterized in that: A self-locking sling mechanism (2) and a multi-directional transfer mechanism (3) connected to the self-locking sling mechanism (2) are arranged on the top of the trailer compartment (1); the multi-directional transfer mechanism (3) comprises a moving beam (4) and a first translation assembly (5) capable of driving the moving beam (4) to translate along the length direction of the trailer compartment (1); a translation slider (6) and a second translation assembly (7) capable of driving the translation slider (6) to translate along the width direction of the trailer compartment (1) are arranged on the moving beam (4); and the self-locking sling mechanism (2) is arranged on the translation slider (6).

2. The self-locking hanging device for cargo transfer on a freight trailer according to claim 1, characterized in that: The self-locking sling mechanism (2) comprises a rotation limit plate (8), a rotating plate (9) and a lifting plate (11) with two hooks (10) at the bottom, wherein the rotation limit plate (8) is fixed on a translation slider (6), and a rotating component connected to the rotating plate (9) is provided on the translation slider (6), a rotation limit component and a rotation locking component are provided between the rotation limit plate (8) and the rotating plate (9), and a lifting component connected to the lifting plate (11) is also provided on the rotating plate (9).

3. The self-locking hanging device for cargo transfer on a freight trailer according to claim 2, characterized in that: The rotating assembly comprises a rotating driver (12) arranged in the translation slider (6), and the output shaft of the rotating driver (12) passes through the rotating limit plate (8) and is connected to the rotating plate (9).

4. The self-locking hanging device for cargo transfer on a freight trailer according to claim 3, characterized in that: The output shaft end of the rotary driver (12) is provided with an inwardly recessed bearing mounting portion (13), and the rotating plate (9) is provided with a bearing (14) whose inner ring is inserted into the bearing mounting portion (13). A limiting pressure plate (15) is also fixed to the rotating plate (9) by a plurality of bolts, and the inner end of the limiting pressure plate (15) abuts against the outer side of the outer ring of the bearing (14).

5. The self-locking hanging device for cargo transfer on a freight trailer according to any one of claims 2 to 4, characterized in that: The rotation limiting assembly comprises an annular limiting groove (16) which is recessed inwardly and arranged on the rotation limiting plate (8), and two rotation limiting rods (17) which are inserted into the annular limiting groove (16) and are symmetrically arranged on the rotation plate (9).

6. The self-locking hanging device for cargo transfer on a freight trailer according to claim 5, characterized in that: The rotation locking assembly comprises an annular plate installation chamber (18) arranged in the rotation limiting plate (8), the annular plate installation chamber (18) being arranged just above the annular limiting groove (16) and the bottom thereof being in communication with the annular limiting groove (16), an annular plate (19) being arranged in the annular plate installation chamber (18), a rotation self-locking structure which can be inserted into the annular limiting groove (16) and lock the rotation limiting rod (17) being arranged at the bottom of the annular plate (19), the rotation self-locking structure comprising a plurality of telescopic rods (20) arranged along the circumferential direction, and two lifting drivers (21) connected to the annular plate (19) being symmetrically arranged on the rotation limiting plate (8), the lifting driver (21) being capable of driving the annular plate (19) to move downward so that the telescopic end of the telescopic rod (20) is inserted into the annular limiting groove (16) to lock the rotation limiting rod (17).

7. The self-locking hanging device for cargo transfer on a freight trailer according to any one of claims 2 to 4, characterized in that: The lifting assembly comprises two rope installation boxes (22) symmetrically arranged on both sides of the rotating plate (9), a rotating drum (23) driven by a motor is arranged in the rope installation box (22), a rope (24) connected to the lifting plate (11) is fixedly wound around the rotating drum (23), and a positioning structure is also arranged between the rotating plate (9) and the lifting plate (11).

8. The self-locking hanging device for cargo transfer on a freight trailer according to claim 7, characterized in that: The positioning structure comprises two positioning grooves (25) corresponding to the pull rope installation box (22); two positioning rods (26) corresponding to the positioning grooves (25) are protruded from the top of the lifting plate (11); a guide wheel (27) is also provided in the positioning groove (25); the pull rope (24) is passed around the guide wheel (27) and is fixedly connected to the top of the positioning rod (26); the cross-sections of the positioning groove (25) and the positioning rod (26) are both circular and an open portion (28) is also provided at the bottom of the positioning groove (25).

9. The self-locking hanging device for cargo transfer on a freight trailer according to any one of claims 1 to 4, characterized in that: The top of the trailer compartment (1) is also provided with a No. 1 slide groove (29) which is recessed inwards, and the movable beam (4) is arranged in the No. 1 slide groove (29). The No. 1 translation assembly (5) includes a No. 1 screw rod (30) arranged along the length direction of the trailer compartment (1) and a No. 1 translation driver (31) which can drive the No. 1 screw rod (30) to rotate. The No. 1 screw rod (30) and the movable beam (4) are screwed together, and translation limit rods (32) which are slidably matched with the movable beam (4) are also provided on both sides of the No. 1 slide groove (29).

10. The self-locking hanging device for cargo transfer on a freight trailer according to claim 9, characterized in that: The bottom of the movable beam (4) is inwardly recessed and provided with a No. 2 slide groove (33), and the top end of the translation slider (6) is inserted into the No. 2 slide groove (33). The No. 2 translation assembly (7) includes a No. 2 screw rod (34) arranged along the width direction of the trailer compartment (1) and a No. 2 translation driver (35) capable of driving the No. 2 screw rod (34) to rotate. The No. 2 screw rod (34) and the translation slider (6) are screwed together.

Images