A semi-trailer facilitating loading and unloading of goods

Abstract

The application discloses a semi-trailer convenient for loading and unloading goods, which is characterized by the following: a plurality of moving platforms are arranged in the carriage; two moving plates of a previous moving platform are arranged to rotate more than 90 degrees around a clamping shaft and to be obliquely placed on the inner side of the carriage through telescopic clamping bases; at this time, the two moving plates of the previous moving platform do not interfere with the movement of the moving plates of a subsequent moving platform, so that the plurality of moving platforms can be moved to the position close to the door for loading and unloading goods; meanwhile, the arrangement of the moving platforms can make the loading and unloading of goods be divided into different areas, which is not conducive to the loading and unloading of scattered goods, but is convenient for the loading and unloading of large household appliances; when the two telescopic clamping bases are moved to the limit state in the direction of approaching each other and are fixed through fixing mechanisms respectively, a limiting shaft is inserted into a limiting tube, so that the two moving plates of the same moving platform can move simultaneously, which is convenient for moving the moving platform.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of semi-trailers, in particular to a semi-trailer facilitating loading and unloading of goods. BACKGROUND

[0002] The semi-trailer is a trailer with an axle placed behind the center of gravity of the vehicle (when the vehicle is uniformly loaded) and equipped with a coupling device capable of transmitting horizontal and vertical forces to the towing vehicle. The van-type semi-trailer is used for transporting goods such as household appliances, light textile goods, and building materials. The conventional van-type semi-trailer is usually provided with doors on both sides or at the tail for loading and unloading goods.

[0003] When loading and unloading goods in the van-type semi-trailer, the following two methods are usually adopted: (1) when loading, the goods are lifted by a forklift, a scissor-type lifting platform, or a loading and unloading platform, so that the goods can enter the door, and then the goods are moved to different parts of the vehicle by a trolley or directly by the operator; when unloading, the goods are moved to the door by a trolley or directly by the operator, and then the goods are unloaded by a forklift, a scissor-type lifting platform, or a loading and unloading platform; (2) when loading and unloading, a loading bridge is provided, so that the forklift can directly drive into the vehicle through the loading bridge, and then the goods on the forklift are moved down for loading, or the goods are moved onto the forklift for unloading.

[0004] However, in the above-mentioned first method, the distance from the placement point of different goods to the door is different, and the goods close to the door are easy to load and unload, while the goods far from the door are not easy to load and unload, especially in the field of transporting household appliances, the weight of the household appliances is usually very large, and the loading and unloading is very inconvenient; in the second method, the width of the vehicle is not too large, and after the forklift drives into the vehicle through the loading bridge, the driving operation is difficult, and the vehicle is prone to deformation under a large load. SUMMARY

[0005] The present application aims to provide a semi-trailer facilitating loading and unloading of goods, which is mainly used for household appliances and other goods, and can move the goods in the vehicle to the door, and then cooperate with a forklift, a scissor-type lifting platform, or a loading and unloading platform to achieve the purpose of facilitating loading and unloading of goods.

[0006] The technical problem is solved by the following technical scheme: a semi-trailer facilitating loading and unloading of goods, comprising a semi-trailer body, a carriage arranged on the semi-trailer body, a tail end of the carriage being provided with a door, a bottom of the carriage being provided with a slide rail assembly extending along a length direction thereof, a plurality of movable platforms movably arranged on the slide rail assembly being arranged side by side on the slide rail assembly, and a shaft being arranged on both sides of the bottom of the carriage and extending along a length direction thereof; the movable platform comprises two movable base plates movably arranged on the slide rail assembly and symmetrically arranged, a telescopic clamping seat telescopically arranged on the bottom of the movable base plate and being capable of being buckled with or separated from the shaft during telescopic movement, two guide shafts arranged on end faces of the telescopic clamping seat close to each other, a limiting tube arranged on an end of one of the guide shafts, a limiting shaft arranged on an end of the other guide shaft, and a fixing mechanism arranged between the guide shaft and the movable base plate and being capable of being fixed when the telescopic clamping seat moves to an extreme state to the left or right; when the two telescopic clamping seats move to an extreme state in a direction of approaching each other and are fixed by the fixing mechanism, the limiting shaft is inserted into the limiting tube, and the telescopic clamping seat does not interfere with the shaft; when the two telescopic clamping seats move to an extreme state in a direction of moving away from each other and are fixed by the fixing mechanism, the limiting tube and the limiting shaft are separated, the telescopic clamping seat is buckled on the shaft, and the movable base plate is rotated by more than 90 degrees around the shaft through the telescopic clamping seat and is obliquely arranged on an inner side of the carriage, and at this time, a front movable base plate arranged on the inner side of the carriage does not affect movement of a rear movable base plate.

[0007] By arranging a plurality of movable platforms in the carriage, and rotating the two movable base plates of the front movable platform by more than 90 degrees around the shaft through the telescopic clamping seat and obliquely arranging the two movable base plates on the inner side of the carriage, at this time, the two movable base plates of the front movable platform do not interfere with movement of the movable base plates of the rear movable platform, so that the plurality of movable platforms can be moved to the position close to the door to load and unload goods, and the arrangement of the movable platforms can divide the loading and unloading area, at this time, the loading and unloading of scattered goods is not facilitated, but the loading and unloading of large household appliances is facilitated; when the two telescopic clamping seats move to an extreme state in a direction of approaching each other and are fixed by the fixing mechanism, the limiting shaft is inserted into the limiting tube, at this time, the two movable base plates of the same movable platform can move simultaneously, which facilitates movement of the movable platform; when the two telescopic clamping seats move to an extreme state in a direction of moving away from each other and are fixed by the fixing mechanism, the limiting tube and the limiting shaft are separated to eliminate the mutual influence of the two movable base plates, the telescopic clamping seat is buckled on the shaft, and the movable base plate is rotated by more than 90 degrees around the shaft through the telescopic clamping seat and is obliquely arranged on the inner side of the carriage, so that the movable base plate can be stably and conveniently arranged on the inner side of the carriage.

[0008] The further arrangement of the present application is that the slide rail assembly comprises four rails arranged along the length direction of the compartment, a plurality of rollers arranged in the rails, the same mobile platform is arranged on two rails, the bottom of the mobile platform is provided with sliding bars abutting on the plurality of rollers, two telescopic clamping seats are arranged on the mobile platform, a linkage rod is arranged between the two guide shafts connected with the two telescopic clamping seats, and the bottom of the mobile platform is provided with a guide sleeve for telescopic arrangement of the guide shaft; the fixing mechanism is arranged between the guide sleeve and the guide shaft close to the door, the bottom of the guide sleeve is provided with a waist-shaped hole, and the fixing mechanism comprises a fixing shaft screwed on the guide shaft through the waist-shaped hole, a connecting seat arranged at the lower end of the fixing shaft, a connecting plate arranged on the guide sleeve and provided with threaded holes at both ends, and a fixing knob bolt screwed in any one of the threaded holes of the connecting plate through the connecting seat.

[0009] By adopting the above technical scheme, the fixing mechanism comprises a fixing shaft screwed on the guide shaft through the waist-shaped hole, a connecting seat arranged at the lower end of the fixing shaft, a connecting plate arranged on the guide sleeve and provided with threaded holes at both ends, and a fixing knob bolt screwed in any one of the threaded holes of the connecting plate through the connecting seat, so that the fixing can be realized when the telescopic clamping seat moves to the limit state; and the plurality of rollers in the rail can reduce the friction between the sliding bars at the bottom of the mobile platform, so that the mobile platform is facilitated to move.

[0010] The further arrangement of the present application is that the mobile platform is provided with an embedding groove for local embedding of the telescopic clamping seat during telescopic movement, when the guide shaft penetrates out of the embedding groove, the guide shaft is sleeved with a first compression spring abutting tightly between the embedding groove and the telescopic clamping seat at both ends.

[0011] By adopting the above technical scheme, the arrangement of the first compression spring can realize the buffering effect during the movement of the telescopic clamping seat in the direction away from the clamping shaft.

[0012] The further arrangement of the present application is that the top of the compartment on both sides is provided with a limiting structure for limiting the top of the mobile platform rotating upward by more than 90 degrees, the limiting structure comprises a limiting seat arranged on the top of the inner side of the compartment and provided with a limiting groove, a second compression spring arranged between the compartment and the limiting seat and driving the limiting seat to move downward, and a guide piece arranged on the limiting seat, when the mobile platform rotates upward by more than 90 degrees, the mobile platform first gradually abuts on the guide piece and overcomes the elastic force of the second compression spring, so that the limiting seat gradually moves upward and rotates to the limiting groove, and then the top of the mobile platform after rotation is embedded in the limiting groove after the second compression spring resets.

[0013] By adopting the above technical scheme, in the process that the movable platform is turned more than 90 degrees around the clamping shaft by the telescopic clamping seat and is leaned and placed on the inner side of the carriage, the limiting structure is used for limiting, so that the stability of the movable platform when being placed is improved, and when the limiting structure limits the movable platform, the movable platform is first gradually abutted on the guide piece and overcomes the elastic force of the second compression spring, so that the limiting seat is gradually moved upward and is rotated to the limiting groove, and then the top of the movable platform after being rotated is embedded in the limiting groove after the second compression spring is reset, so that the movable platform is in the leaning state after being upwardly rotated, and the movable platform at the front is convenient for loading the goods.

[0014] Further, the top of the movable platform is separated from the limiting groove by separating the fixed knob bolt from the corresponding threaded hole after the movable platform is upwardly rotated more than 90 degrees.

[0015] Further, the top of the movable platform is separated from the limiting groove by separating the fixed knob bolt from the corresponding threaded hole after the movable platform is upwardly rotated more than 90 degrees.

[0016] Further, the movable platform is provided with a plurality of recesses on the front and rear sides, and the recesses are provided with connecting hooks for fixing the binding ropes for binding and reinforcing the goods.

[0017] Further, the movable platform is provided with a plurality of recesses on the front and rear sides, and the recesses are provided with connecting hooks for fixing the binding ropes for binding and reinforcing the goods.

[0018] Further, the movable platform is provided with a plurality of recesses on the front and rear sides, and the recesses are provided with connecting hooks for fixing the binding ropes for binding and reinforcing the goods.

[0019] Further, the movable platform is provided with a plurality of recesses on the front and rear sides, and the recesses are provided with connecting hooks for fixing the binding ropes for binding and reinforcing the goods.

[0020] The further arrangement of the present application is that the operation method for loading and unloading the household appliances includes the following steps: (S1) in the initial state, the moving platform farthest from the compartment door is removed, and the moving platform of the remaining moving platform is rotated more than 90 degrees around the clamping shaft through the telescopic clamping seat and is inclined and placed on the inner side of the compartment, and the top of the moving platform is limited through the limiting groove of the limiting structure; (S2) in the loading process, the moving platform farthest from the compartment door is first moved to the vicinity of the compartment door, the goods are reinforced through the connecting hook and the binding rope after the loading and unloading of the goods, and the moving platform is reset after installation; then, the two moving platforms of the moving platform are placed one by one, and the loading is completed; (S3) in the unloading process, the moving platform closest to the compartment door and loaded with goods is first moved to the vicinity of the compartment door for unloading, and then the moving platform is reset, and the two moving platforms of the moving platform are upwardly rotated and placed on the inner side of the compartment, and the top of the moving platform is limited through the limiting groove of the limiting structure.

[0021] The further arrangement of the present application is that the operation process of placing the two moving platforms of the moving platform in step (S2) is as follows: the fixed knob bolt is first separated from the corresponding threaded hole, at this time, the moving platform falls downward by a distance, so that the top of the moving platform is separated from the limiting groove, thereby releasing the limiting of the limiting structure on the moving platform; the moving platform is downwardly rotated and reset through the telescopic clamping seat around the clamping shaft, the sliding bar falls on the guide inclined surface of the track and slides and is placed on the plurality of rollers, and finally the two telescopic clamping seats are moved to the limit state in the direction of approaching each other and are fixed through the fixing mechanism respectively. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1 is a structural schematic diagram of embodiment 1;

[0024] Figure 2 is a sectional view of the compartment in embodiment 1;

[0025] Figure 3 is a partial structural schematic diagram of the moving platform in embodiment 1;

[0026] Figure 4 is another structural schematic diagram of the moving platform in embodiment 1;

[0027] Figure 5 is Figure 4 the enlarged view of A in the above

[0028] Figure 6 This is a partial structural diagram of the telescopic card slot in Embodiment 1;

[0029] Figure 7 yes Figure 2 A schematic diagram of a partially upward-flipping moving platform based on a given structure;

[0030] Figure 8 This is a cross-sectional view of the carriage in Example 2;

[0031] Figure 9 yes Figure 8 A magnified view of the area located at point B;

[0032] Figure 10 yes Figure 8 A magnified view of the area located at point C.

[0033] In the diagram: 1. Semi-trailer body; 2. Cargo box; 21. Cargo box door; 22. Slide rail assembly; 221. Rail; 2211. Guide ramp; 222. Roller; 23. Shaft; 3. Moving platform; 31. Moving table; 311. Sliding bar; 312. Guide sleeve; 3121. Waist-shaped hole; 313. Embedded groove; 314. First compression spring; 315. Recess; 316. Connecting hook; 317. Handle; 32. Telescopic seat; 33. Guide shaft; 34. Limiting tube; 35. Limiting shaft; 36. Fixing mechanism; 361. Fixing shaft; 362. Connecting seat; 363. Connecting plate; 3631. Threaded hole; 364. Fixing knob bolt; 37. Linkage rod; 4. Limiting structure; 41. Limiting seat; 411. Limiting groove; 42. Second compression spring; 43. Guide plate. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] Example 1: A semi-trailer that facilitates loading and unloading of goods, such as Figures 1 to 3 As shown, the vehicle includes a semi-trailer body 1 and a cargo box 2 mounted on the semi-trailer body 1. A cargo box door 21 is provided at the rear end of the cargo box 2. A slide rail assembly 22 extending along its length is provided at the bottom of the cargo box 2. Multiple movable platforms 3 that can move along the slide rail assembly 22 are placed side by side on the slide rail assembly 22.

[0036] For example, 2 to Figure 4As shown, the bottom of the car 2 is provided with a clamping shaft 23 extending along the length direction thereof. The moving platform 3 comprises two moving plates 31 symmetrically arranged on the slide rail assembly 22, two telescopic clamping seats 32 arranged on the bottom of the moving plate 31 and capable of being buckled or separated from the clamping shaft 23 during the telescopic process, two guide shafts 33 arranged on the end faces of the telescopic clamping seats 32 respectively, a limiting tube 34 arranged on the end of one of the guide shafts 33, a limiting shaft 35 arranged on the end of the other guide shaft 33, and a fixing mechanism 36 arranged between the guide shaft 33 and the moving plate 31 and capable of being fixed when the telescopic clamping seats 32 are moved to the limit state. When the two telescopic clamping seats 32 are moved to the limit state in the direction of approaching each other and are fixed by the fixing mechanism 36 respectively, the limiting shaft 35 is inserted into the limiting tube 34, and the telescopic clamping seats 32 do not interfere with the clamping shaft 23; when the two telescopic clamping seats 32 are moved to the limit state in the direction of moving away from each other and are fixed by the fixing mechanism 36 respectively, the limiting tube 34 and the limiting shaft 35 are separated, the telescopic clamping seats 32 are buckled on the clamping shaft 23, the moving plate 31 is rotated by more than 90 degrees around the clamping shaft 23 through the telescopic clamping seats 32 and is inclined and placed on the inner side of the car 2, and at this time, the front moving plate 31 placed on the inner side of the car 2 does not affect the movement of the rear moving plate 31.

[0037] As shown in the figure, Figures 3 to 5 The slide rail assembly 22 comprises four rails 221 arranged along the length direction of the car 2, a plurality of rollers 222 arranged in the rails 221, the same moving plate 31 is slidably arranged on two rails 221, the bottom of the moving plate 31 is provided with a sliding bar 311 abutting on the plurality of rollers 222, two telescopic clamping seats 32 are arranged on one moving plate 31, a linkage rod 37 is arranged between the two guide shafts 33 connected with the two telescopic clamping seats 32, and the bottom of the moving plate 31 is provided with a guide sleeve 312 for telescopic arrangement of the guide shaft 33. The fixing mechanism 36 is arranged between the guide sleeve 312 and the guide shaft 33 close to the door 21, the bottom of the guide sleeve 312 is provided with a waist-shaped hole 3121, the fixing mechanism 36 comprises a fixing shaft 361 screwed on the guide shaft 33 through the waist-shaped hole 3121, a connecting seat 362 arranged on the lower end of the fixing shaft 361, a connecting plate 363 arranged on the guide sleeve 312 and provided with threaded holes 3631 at both ends, and a fixing knob screw 364 screwed in any one of the threaded holes 3631 of the connecting plate 363 after passing through the connecting seat 362.

[0038] As shown in the figure, Figures 4 to 6As shown, the mobile platform 3 is provided with the telescopic seat 32 which is partially embedded in the embedding slot 313 on the mobile platform 31 during the telescopic process, and the guide shaft 33 is provided with the first compression spring 314 which is tightly arranged at the two ends of the embedding slot 313 and the telescopic seat 32. The mobile platform 31 is provided with the plurality of recesses 315 on the front and rear sides, and the connecting hooks 316 for fixing the binding ropes of the bound and reinforced goods are arranged at the recesses 315. The handle 317 is arranged at the bottom of the mobile platform 31 close to the compartment door 21.

[0039] Effects of the implementation: As shown, Figures 1 to 7 The plurality of mobile platforms 3 are arranged in the compartment 2, and the two mobile platforms 31 of the previous mobile platform 3 are tilted and placed on the inner side of the compartment 2 by rotating more than 90 degrees around the clamping shaft 23 through the telescopic seat 32. At this time, the two mobile platforms 31 of the previous mobile platform 3 do not interfere with the movement of the mobile platform 31 of the subsequent mobile platform 3, so that the plurality of mobile platforms 3 can be moved to the compartment door 21 to load and unload the goods. At the same time, the arrangement of the mobile platform 3 can make the loading and unloading of goods be divided into zones. At this time, it is not conducive to the loading and unloading of scattered goods, but it is convenient for loading and unloading large goods such as household appliances. When the two telescopic seats 32 are moved to the limit state in the direction of approaching each other and are fixed through the fixing mechanism 36 respectively, the limiting shaft 35 is inserted into the limiting tube 34. At this time, the two mobile platforms 31 of the same mobile platform 3 can move simultaneously, which is convenient for moving the mobile platform 3. When the two telescopic seats 32 are moved to the limit state in the direction of moving away from each other and are fixed through the fixing mechanism 36 respectively, the limiting tube 34 and the limiting shaft 35 are separated to eliminate the mutual influence of the two mobile platforms 31. The telescopic seat 32 is buckled on the clamping shaft 23, and the mobile platform 31 is tilted and placed on the inner side of the compartment 2 by rotating more than 90 degrees around the clamping shaft 23 through the telescopic seat 32, so that the mobile platform 31 can be stably and conveniently placed on the inner side of the compartment 2.

[0040] Embodiment 2: A semi-trailer convenient for loading and unloading goods, as shown in Figures 8 to 10The difference between the embodiment 1 and the embodiment 2 is that the top of the moving table plate 31 on both sides of the carriage 2 is provided with a limiting structure 4 for limiting the top of the moving table plate 31 which is turned upward more than 90 degrees. The limiting structure 4 comprises a limiting seat 41 which is provided on the top of the inner side of the carriage 2 and has a limiting slot 411, a second compression spring 42 which is provided between the carriage 2 and the limiting seat 41 and drives the limiting seat 41 to move downward, a guide piece 43 which is provided on the limiting seat 41, when the moving table plate 31 is turned upward more than 90 degrees, the moving table plate 31 first gradually contacts the guide piece 43 and overcomes the elastic force of the second compression spring 42, so that the limiting seat 41 is gradually turned to the limiting slot 411 during the upward movement, and then the top of the moving table plate 31 after being turned is embedded in the limiting slot 411 after the second compression spring 42 is reset. At the same time, after the moving table plate 31 is turned upward more than 90 degrees, the top of the limiting plate is separated from the limiting slot 411 by separating the fixed knob bolt 364 from the corresponding threaded hole 3631; the side of the slot opening of the track 221 in which the sliding bar 311 is embedded is provided with a guide inclined surface 2211, and during the downward turning reset of the moving table plate 31, the sliding bar 311 falls on the guide inclined surface 2211 and gradually slides into the slot opening of the track 221.

[0041] The implementation effect is that during the turning of the moving table plate 31 around the clamping shaft 23 more than 90 degrees by the telescopic clamping seat 32 and the tilting of the moving table plate 31 on the inner side of the carriage 2, the limiting structure 4 is used for limiting, so as to improve the stability of the moving table plate 31 during the tilting, and when the limiting structure 4 limits the moving table plate 31, the moving table plate 31 first gradually contacts the guide piece 43 and overcomes the elastic force of the second compression spring 42, so that the limiting seat 41 is gradually turned to the limiting slot 411 during the upward movement, and then the top of the moving table plate 31 after being turned is embedded in the limiting slot 411 after the second compression spring 42 is reset, which has the purpose of facilitating use, and after the previous unloading, all the moving table plates 31 in front can be in the tilting state after being turned upward, which facilitates the loading of the innermost moving table plate 31 during the subsequent loading. After the moving table plate 31 is turned upward more than 90 degrees, the top of the moving table plate 31 is separated from the limiting slot 411 by separating the fixed knob bolt 364 from the corresponding threaded hole 3631, so that the limiting of the limiting structure 4 to the moving table plate 31 is released; and at this time, when the moving table plate 31 is turned downward to reset around the clamping shaft 23, the sliding bar 311 and the track 221 are misaligned, the side of the slot opening of the track 221 in which the sliding bar 311 is embedded is provided with a guide inclined surface 2211, and during the downward turning reset of the moving table plate 31, the sliding bar 311 falls on the guide inclined surface 2211 and gradually slides into the slot opening of the track 221, so as to facilitate the reset.

[0042] The operation method for loading and unloading the household appliances comprises the following steps: (S1) in the initial state, the moving platform 3 farthest from the compartment door 21 is removed, the moving platform 3 is rotated by more than 90 degrees around the clamping shaft 23 through the telescopic clamping seat 32, and is leaned against the inner side of the compartment 2, and the top of the moving platform 3 is limited by the limiting groove 411 of the limiting structure 4; (S2) in the loading process, the moving platform 3 farthest from the compartment door 21 is first moved to the position close to the compartment door 21, the goods are reinforced by the connecting hook 316 and the binding rope after the loading and unloading of the goods, and the moving platform 3 is reset after the installation; then, the two moving platforms 3 are lowered one by one, and the loading is completed; (S3) in the unloading process, the moving platform 3 closest to the compartment door 21 and loaded with the goods is first moved to the position close to the compartment door 21 for unloading, and then the moving platform 3 is reset, the two moving platforms 3 are rotated upward and leaned against the inner side of the compartment 2, and the top of the moving platform 3 is limited by the limiting groove 411 of the limiting structure 4.

[0043] Meanwhile, the operation process of lowering the two moving platforms 31 of the moving platform 3 in step (S2) is as follows: the fixed knob bolt 364 is separated from the corresponding threaded hole 3631, at this time, the moving platform 31 is lowered by a distance, the top of the moving platform 31 is separated from the limiting groove 411, and the limiting structure 4 is removed from the limiting of the moving platform 31; the moving platform 31 is rotated downward around the clamping shaft 23 through the telescopic clamping seat 32, the sliding bar 311 is placed on the guide inclined surface 2211 of the track 221 and slides and leans against the plurality of rollers 222, and finally the two telescopic clamping seats 32 are moved to the limit state in the direction of approaching each other and are fixed through the fixing mechanism 36, respectively.

Claims

1. A semi-trailer facilitating loading and unloading of goods, comprising a semi-trailer body (1), a carriage (2) arranged on the semi-trailer body (1), a tail end of the carriage (2) being provided with a carriage door (21), characterized in that: The bottom of the carriage (2) is provided with a slide rail assembly (22) extending along the length direction thereof, a plurality of mobile platforms (3) capable of moving along the slide rail assembly (22) are arranged side by side on the slide rail assembly (22), the bottom of each side of the carriage (2) is provided with a clamping shaft (23) extending along the length direction thereof, the mobile platform (3) comprises two mobile base plates (31) symmetrically arranged and slidingly arranged on the slide rail assembly (22), a telescopic clamping seat (32) telescopically arranged at the bottom of the mobile base plate (31) and capable of being buckled with or separated from the clamping shaft (23) during the telescopic process, two guide shafts (33) respectively arranged on the end faces of the two telescopic clamping seats (32) close to each other, a limiting tube (34) arranged at the end of one of the guide shafts (33), a limiting shaft (35) arranged at the end of the other guide shaft (33), and a fixing mechanism (36) arranged between the guide shaft (33) and the mobile base plate (31) and capable of being fixed when the telescopic clamping seat (32) moves to the limit state left and right; When the two telescopic clamping seats (32) move to the limit state in the direction of approaching each other and are fixed by the fixing mechanism (36) respectively, the limiting shaft (35) is inserted into the limiting tube (34), and the telescopic clamping seat (32) does not interfere with the clamping shaft (23); when the two telescopic clamping seats (32) move to the limit state in the direction of moving away from each other and are fixed by the fixing mechanism (36) respectively, the limiting tube (34) and the limiting shaft (35) are separated, the telescopic clamping seat (32) is buckled on the clamping shaft (23), the mobile base plate (31) rotates more than 90 degrees around the clamping shaft (23) through the telescopic clamping seat (32) and is inclined and arranged on the inner side of the carriage (2), and at this time, the front mobile base plate (31) arranged on the inner side of the carriage (2) does not affect the movement of the rear mobile base plate (31).

2. A semi-trailer for facilitating the loading and unloading of cargo as claimed in claim 1 wherein: The slide rail assembly (22) comprises four tracks (221) arranged along the length direction of the carriage (2), a plurality of rollers (222) arranged in the tracks (221), the same mobile base plate (31) slidingly arranged on two tracks (221), the bottom of the mobile base plate (31) provided with a sliding bar (311) abutting on the plurality of rollers (222), two telescopic clamping seats (32) arranged on one mobile base plate (31), a linkage rod (37) arranged between the two guide shafts (33) connected with the two telescopic clamping seats (32), and a guide sleeve (312) telescopically arranged on the bottom of the mobile base plate (31) for the guide shaft (33). The fixing mechanism (36) is arranged between the guide sleeve (312) close to the door (21) and the guide shaft (33), the bottom of the guide sleeve (312) is provided with a waist-shaped hole (3121), the fixing mechanism (36) comprises a fixing shaft (361) screwed on the guide shaft (33) through the waist-shaped hole (3121), a connecting seat (362) arranged at the lower end of the fixing shaft (361), a connecting plate (363) arranged to the guide sleeve (312) and provided with threaded holes (3631) at both ends, and a fixing knob bolt (364) screwed in any threaded hole (3631) of the connecting plate (363) after passing through the connecting seat (362).

3. A semi-trailer for facilitating the loading and unloading of cargo as claimed in claim 2 wherein: The moving plate (31) is provided with an embedding groove (313) for partially embedding the telescopic holder (32) during the telescopic process, and the guide shaft (33) is provided with the first compression spring (314) abutting tightly between the embedding groove (313) and the telescopic holder (32) at both ends when the guide shaft (33) penetrates the embedding groove (313).

4. A semi-trailer for facilitating the loading and unloading of cargo as claimed in claim 3 wherein: The top of each side of the carriage (2) is provided with a limiting structure (4) for limiting the top of the moving plate (31) rotating upward by more than 90 degrees, the limiting structure (4) comprises a limiting seat (41) arranged on the top of the inner side of the carriage (2) and provided with a limiting groove (411), a second compression spring (42) arranged between the carriage (2) and the limiting seat (41) and driving the limiting seat (41) to move downward, and a guide piece (43) arranged on the limiting seat (41), when the moving plate (31) rotates upward by more than 90 degrees, the moving plate (31) first abuts on the guide piece (43) and overcomes the elastic force of the second compression spring (42) to make the limiting seat (41) rotate to the limiting groove (411) during the process of gradually moving upward, and then the top of the moving plate (31) after rotation is embedded in the limiting groove (411) after the second compression spring (42) resets.

5. A semi-trailer for facilitating the loading and unloading of cargo as claimed in claim 4 wherein: After the moving plate (31) rotates upward by more than 90 degrees, the top of the moving plate (31) is separated from the limiting groove (411) by separating the fixing knob bolt (364) from the corresponding threaded hole (3631); the side of the slot of the track (221) for embedding the sliding bar (311) is provided with a guide slope (2211), and during the process of the moving plate (31) rotating downward to reset, the sliding bar (311) falls on the guide slope (2211) and gradually slides into the slot of the track (221).

6. A semi-trailer for facilitating the loading and unloading of cargo as claimed in claim 5 wherein: The moving plate (31) is provided with a plurality of recesses (315) on the front and rear sides, and the recesses (315) are provided with connecting hooks (316) for fixing the binding ropes of the bound and reinforced goods.

7. A semi-trailer for facilitating the loading and unloading of cargo as claimed in claim 6 wherein: The bottom of the side of the moving plate (31) close to the door (21) is provided with a handle (317).

8. A semi-trailer for facilitating the loading and unloading of cargo as claimed in claim 7 wherein: The operation method for loading and unloading the household electrical goods comprises the following steps: The operation method for loading and unloading the household electrical goods comprises the following steps: (S1) In the initial state, the moving platform (3) farthest from the door (21) is removed, and the moving platform (3) is rotated by more than 90 degrees around the clamping shaft (23) through the telescopic clamping seat (32) and is inclined and placed on the inner side of the carriage (2), and the top of the moving platform (31) is limited by the limiting groove (411) of the limiting structure (4); (S2) When loading, first move the moving platform (3) farthest from the door (21) to the vicinity of the door (21), and after loading and unloading the goods, reinforce the goods through the connecting hook (316) and the binding rope, and then reset the moving platform (3); Then, the two moving platforms (31) of the moving platform (3) are lowered and loaded, and the loading is completed; (S3) When unloading, first move the moving platform (3) closest to the door (21) and loaded with goods to the vicinity of the door (21) to unload, then reset the moving platform (3), and then rotate the two moving platforms (31) of the moving platform (3) upward and rest on the inner side of the carriage (2), and the top of the moving platform (31) is limited by the limiting groove (411) of the limiting structure (4).

9. A semi-trailer for facilitating the loading and unloading of cargo as claimed in claim 8 wherein: The operation process of lowering the two moving platforms (31) of the moving platform (3) in step (S2) is as follows: first, separate the fixed knob bolt (364) from the corresponding threaded hole (3631), at this time the moving platform (31) will fall down by one end distance, so that the top of the moving platform (31) is separated from the limiting groove (411), thereby releasing the limiting structure (4) to the moving platform (31); Make the moving platform (31) rotate downward and reset around the clamping shaft (23) through the telescopic clamping seat (32), the sliding bar (311) will fall on the guide slope (2211) of the track (221) and slide and rest on the plurality of rollers (222), and finally make the two telescopic clamping seats (32) move to the limit state in the direction of approaching each other and are fixed through the fixing mechanism (36) respectively.

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