Folding transportation semitrailer and system

Abstract

The invention relates to the technical field of trailers, in particular to a folding transportation semitrailer and system. The folding transportation semitrailer comprises a connecting frame and a bearing assembly; the bearing assembly comprises a middle vehicle body, a first sliding beam, a second sliding beam, a third sliding beam, a rear vehicle body, two first butt joint cylinders, two second butt joint cylinders, two third butt joint cylinders, two fourth butt joint cylinders, two front locking mechanisms, two rear locking mechanisms, a clamping mechanism, a front butt joint block, a rear butt joint block and a butt joint mechanism. During transportation and use, the first sliding beam and the third sliding beam both extend out of the middle vehicle body, the connecting frame, the first sliding beam, the middle vehicle body, the third sliding beam and the rear vehicle body are matched to bear goods, the whole body is long, during no-load, the first sliding beam and the third sliding beam both retract into the middle vehicle body, the rear vehicle body is close to the middle vehicle body, and the whole length is shortened. Driving is convenient, wind resistance and oil consumption are effectively reduced, and no-load cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of trailers, and in particular to a foldable transport semitrailer and a system thereof. Background Art

[0002] A semi-trailer is a trailer without a front axle. Its front end is connected to the tractor through a traction device. During driving, the tractor not only provides power but also bears part of the weight of the vehicle. This structure makes the semi-trailer have high flexibility and loading capacity, and is widely used in long-distance transportation, logistics distribution and other fields.

[0003] Some semi-trailers with large cargo capacity in the prior art have a long overall length. After transporting the goods to the destination and unloading them, they are empty on the return journey and still occupy a large space, which is inconvenient to drive. They cannot effectively reduce wind resistance and fuel consumption, causing unnecessary waste and resulting in still high empty-load transportation costs. Summary of the invention

[0004] The purpose of the present invention is to provide a foldable transport semitrailer and system, which can effectively reduce the empty-load transport cost.

[0005] To achieve the above-mentioned object, in a first aspect, the present invention provides a foldable transport semitrailer, comprising a connecting frame; Also included is a load-bearing assembly; The bearing assembly includes an intermediate car body, a first sliding beam, a second sliding beam, a third sliding beam, a rear car body, two first docking cylinders, two second docking cylinders, two third docking cylinders, two fourth docking cylinders, two front locking mechanisms, two rear locking mechanisms, a clamping mechanism, a front docking block, a rear docking block and a docking mechanism; The first sliding beam is slidably arranged in the middle car body and is fixedly connected to the connecting frame; the second sliding beam is slidably arranged in the first sliding beam; the third sliding beam is slidably arranged in the middle car body; the rear car body is fixedly arranged on one side of the third sliding beam; the two first docking tubes are respectively fixedly arranged on the top and bottom of the first sliding beam; the two second docking tubes are respectively fixedly arranged on the top and bottom of the first sliding beam; the two third docking tubes are respectively fixedly arranged on the top and bottom of the third sliding beam; the two fourth docking tubes are respectively fixedly arranged on the top and bottom of the third sliding beam; the two front locking mechanisms are arranged in the middle car body; the two rear locking mechanisms are arranged in the middle car body; the clamping mechanism is arranged in the second sliding beam; the front docking block is fixedly arranged on one side of the second sliding beam; the rear docking block is fixedly arranged on one side of the third sliding beam; the docking mechanism is arranged on one side of the third sliding beam.

[0006] Wherein, the front locking mechanism comprises two first electric push rods and two first pin rods; The two first electric push rods are fixedly arranged in the middle body respectively; the two first pin rods are slidably arranged in the middle body respectively, and are fixedly connected with the output ends of the two first electric push rods respectively.

[0007] Wherein, the rear locking mechanism comprises two second electric push rods and two second pin rods; The two second electric push rods are respectively fixedly arranged in the middle body; the two second pin rods are respectively slidably arranged in the middle body and are respectively fixedly connected to the output ends of the two second electric push rods.

[0008] Wherein, the first sliding beam has a clamping hole; the clamping mechanism includes a third electric push rod and a third pin rod; The third electric push rod is fixedly arranged in the second sliding beam; the third pin is fixedly connected to the output end of the third electric push rod, and is slidably connected to the second sliding beam and passes through the second sliding beam.

[0009] Wherein, the docking mechanism includes a fourth electric push rod and a fourth pin rod; The fourth electric push rod is fixedly arranged at one side of the third sliding beam; the fourth pin is fixedly arranged at the output end of the fourth electric push rod.

[0010] Wherein, the bearing assembly further comprises two enclosure mechanisms; The two enclosure mechanisms are respectively arranged on both sides of the middle vehicle body.

[0011] Wherein, the enclosure mechanism comprises a first rotating rod, a second rotating rod, a first connecting rod and a second connecting rod; The first rotating rod is rotatably arranged on the side of the middle vehicle body; the second rotating rod is rotatably arranged on the side of the middle vehicle body; one end of the first connecting rod is rotatably connected to the connecting frame, and the other end is rotatably connected to the first rotating rod; one end of the second connecting rod is rotatably connected to the first rotating rod, and the other end is rotatably connected to the second rotating rod.

[0012] In a second aspect, the present invention provides a system for a folding transport semi-trailer, comprising the folding transport semi-trailer.

[0013] A foldable transport semitrailer and system of the present invention, wherein the connecting frame is used to connect with the tractor, the first sliding beam can slide in the middle vehicle body, and the second sliding beam is slidably arranged in the first sliding beam, and the first sliding beam and the second sliding beam form a telescopic beam. After the telescopic beam is fully extended, it can be locked by the clamping mechanism, so that the first sliding beam and the second sliding beam can no longer slide relative to each other and can only move synchronously; the third sliding beam can also slide in the middle vehicle body, and the rear vehicle body moves synchronously with the third sliding beam; the two first docking cylinders are arranged one above the other on the first sliding beam, and the two second docking cylinders are also arranged one above the other on the first sliding beam. The first docking cylinder and the second docking cylinder are both adapted to the front locking mechanism, and the front locking mechanism can lock the first docking cylinder or the second docking cylinder, thereby locking the first sliding beam and preventing it from sliding further; the two third docking cylinders are arranged one above the other on the third sliding beam, and the two fourth docking cylinders are also arranged one above the other on the third sliding beam, and the two third docking cylinders and the two fourth docking cylinders are both adapted to the rear locking mechanism, and the rear locking mechanism can lock the third docking cylinder or the fourth docking cylinder, thereby locking the third sliding beam and preventing it from sliding further; the front docking block and the rear docking block can be docked together by the docking mechanism, so that the second The sliding beam and the third sliding beam are connected together; in an unloaded state, the two front locking mechanisms lock the two first docking cylinders, thereby locking the first sliding beam and preventing it from sliding any further, and the two rear locking mechanisms lock the two fourth docking cylinders, thereby locking the third sliding beam and preventing it from sliding any further, and the second sliding beam and the third sliding beam are connected together through the front docking block, the rear docking block and the docking mechanism, and the first sliding beam and the third sliding beam are both retracted within the middle vehicle body, with a small overall length, which is convenient for driving, and also effectively reduces wind resistance and fuel consumption, thereby reducing unloaded costs; when the transport of goods needs to be unfolded, the two front locking mechanisms release the two first docking cylinders, and the tractor drives The connecting frame drives the first sliding beam to slide out of the middle vehicle body for a distance, so that the telescopic beam composed of the first sliding beam and the second sliding beam is fully extended, and then locked by the clamping mechanism, and then the two rear locking mechanisms release the two fourth docking cylinders, and then the tractor drives the first sliding beam to slide toward the middle vehicle body, and the first sliding beam drives the second sliding beam, and the second sliding beam pushes the third sliding beam to slide out, and the rear vehicle body moves backward until the two third docking cylinders move to the sides of the two rear locking mechanisms, and then the two third docking cylinders are locked by the two rear locking mechanisms, and at this time, the third sliding beam is located outside the middle vehicle body;Then the docking mechanism releases the front docking block and the rear docking block, the second sliding beam separates from the third sliding beam, and the tractor drives the first sliding beam to slide outward until the two second docking cylinders move to the sides of the two front locking mechanisms, and then the two second docking cylinders can be locked with the two front locking mechanisms; the first sliding beam and the third sliding beam are both extended to the outside of the middle vehicle body, fully unfolded, and have a long length, so that goods such as logs can be transported. ; BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0015] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention.

[0016] Figure 2 It is a front view of the first embodiment of the present invention.

[0017] Figure 3 yes Figure 2 Cross-sectional view along the AA direction.

[0018] Figure 4 yes Figure 2 Cross-sectional view along direction BB.

[0019] Figure 5 yes Figure 4 A partial enlargement of detail A.

[0020] Figure 6 yes Figure 4 A partial enlargement of detail B.

[0021] Figure 7 It is a left side view of the first embodiment of the present invention.

[0022] Figure 8 yes Figure 7 Cross-sectional view along CC direction.

[0023] Fig. 9 yes Figure 8 A partial enlargement of detail C.

[0024] Fig.10 yes Figure 8 A partial enlargement of detail D.

[0025] 1-connecting frame, 2-intermediate vehicle body, 3-first sliding beam, 4-second sliding beam, 5-third sliding beam, 6-rear vehicle body, 7-first docking cylinder, 8-second docking cylinder, 9-third docking cylinder, 10-fourth docking cylinder, 11-front locking mechanism, 12-rear locking mechanism, 13-clamping mechanism, 14-front docking block, 15-rear docking block, 16-docking mechanism, 17-enclosing mechanism, 31-clamping hole, 111-first electric push rod, 112-first pin rod, 121-second electric push rod, 122-second pin rod, 131-third electric push rod, 132-third pin rod, 161-fourth electric push rod, 162-fourth pin rod, 171-first rotating rod, 172-second rotating rod, 173-first connecting rod, 174-second connecting rod. DETAILED DESCRIPTION

[0026] The first embodiment of the present application is: See also Figure 1-Figure 10 ,in, Figure 1 It is a schematic structural diagram of the first embodiment of the present invention. Figure 2 It is a front view of the first embodiment of the present invention. Figure 3 yes Figure 2 Cross-sectional view along the AA direction. Figure 4 yes Figure 2 Cross-sectional view along direction BB. Figure 5 yes Figure 4 A partial enlargement of detail A. Figure 6 yes Figure 4 A partial enlargement of detail B. Figure 7 It is a left side view of the first embodiment of the present invention. Figure 8 yes Figure 7 Cross-sectional view along CC direction. Fig. 9 yes Figure 8 A partial enlargement of detail C. Fig.10 yes Figure 8 A partial enlargement of detail D.

[0027] The present invention provides a folding transport semitrailer: comprising a connecting frame 1; and also comprising a bearing assembly; the bearing assembly comprises an intermediate body 2, a first sliding beam 3, a second sliding beam 4, a third sliding beam 5, a rear body 6, two first docking cylinders 7, two second docking cylinders 8, two third docking cylinders 9, two fourth docking cylinders 10, two front locking mechanisms 11, two rear locking mechanisms 12, a clamping mechanism 13, a front docking block 14, a rear docking block 15 and a docking mechanism 16; the front locking mechanism 11 comprises two first electric push rods 111 and two first pin rods 112. 12; the rear locking mechanism 12 includes two second electric push rods 121 and two second pin rods 122; the first sliding beam 3 has a clamping hole 31; the clamping mechanism 13 includes a third electric push rod 131 and a third pin rod 132; the docking mechanism 16 includes a fourth electric push rod 161 and a fourth pin rod 162; the bearing assembly also includes two enclosure mechanisms 17; the enclosure mechanism 17 includes a first rotating rod 171, a second rotating rod 172, a first connecting rod 173 and a second connecting rod 174; the above-mentioned scheme can effectively reduce the cost of empty transportation.

[0028] Furthermore, the first sliding beam 3 is slidably arranged in the middle car body 2 and is fixedly connected to the connecting frame 1; the second sliding beam 4 is slidably arranged in the first sliding beam 3; the third sliding beam 5 is slidably arranged in the middle car body 2; the rear car body 6 is fixedly arranged on one side of the third sliding beam 5; the two first docking tubes 7 are respectively fixedly arranged at the top and bottom of the first sliding beam 3; the two second docking tubes 8 are respectively fixedly arranged at the top and bottom of the first sliding beam 3; the two third docking tubes 9 are respectively fixedly arranged at the top and bottom of the third sliding beam 5; the two fourth docking tubes 10 are respectively fixedly arranged at the top and bottom of the third sliding beam 5; the two front locking mechanisms 11 are arranged in the middle car body 2; the two rear locking mechanisms 12 are arranged in the middle car body 2; the clamping mechanism 13 is arranged in the second sliding beam 4; the front docking block 14 is fixedly arranged on one side of the second sliding beam 4; the rear docking block 15 is fixedly arranged on one side of the third sliding beam 5; the docking mechanism 16 is arranged on one side of the third sliding beam 5.

[0029] In this embodiment, the connecting frame 1 is used to connect with the tractor, the first sliding beam 3 can slide in the middle car body 2, and the second sliding beam 4 is slidably arranged in the first sliding beam 3, the first sliding beam 3 and the second sliding beam 4 form a telescopic beam, and after the telescopic beam is fully extended, it can be locked by the clamping mechanism 13, so that the first sliding beam 3 and the second sliding beam 4 can no longer slide relative to each other, and can only move synchronously; the third sliding beam 5 can also slide in the middle car body 2, and the rear car body 6 moves synchronously with the third sliding beam 5; the two first docking cylinders 7 are arranged on the first sliding beam 3 one above and one below, and the two second docking cylinders 8 are also arranged on the first sliding beam 3 one above and one below, and the first docking cylinder 7 and the second docking cylinder 8 are both adapted to the front locking mechanism 11, and the front locking mechanism 11 can lock the first docking cylinder 7 or the second docking cylinder 8, so as to lock the first sliding beam 3 and prevent it from sliding; the two third docking cylinders 9 are arranged on the third sliding beam 5 one above and one below, and the two fourth docking cylinders 9 are arranged on the third sliding beam 5 one above and one below. The two third docking cylinders 9 and the two fourth docking cylinders 10 are also arranged one above the other on the third sliding beam 5. The two third docking cylinders 9 and the two fourth docking cylinders 10 are adapted to the rear locking mechanism 12. The rear locking mechanism 12 can lock the third docking cylinder 9 or the fourth docking cylinder 10, thereby locking the third sliding beam 5 and preventing it from sliding. The front docking block 14 and the rear docking block 15 can be docked together by the docking mechanism 16, so that the second sliding beam 4 and the third sliding beam 5 are connected together. In the no-load state, the two front locking mechanisms 11 will The two first docking cylinders 7 are locked, thereby locking the first sliding beam 3 and preventing it from sliding any further. The two rear locking mechanisms 12 lock the two fourth docking cylinders 10, thereby locking the third sliding beam 5 and preventing it from sliding any further. The second sliding beam 4 and the third sliding beam 5 are connected together through the front docking block 14, the rear docking block 15 and the docking mechanism 16. The first sliding beam 3 and the third sliding beam 5 are both retracted in the middle vehicle body 2. The overall length is small, which is convenient for driving, and also effectively reduces wind resistance and fuel consumption, thereby reducing no-load costs.When the transported goods need to be unfolded, the two front locking mechanisms 11 release the two first docking cylinders 7, the tractor drives the connecting frame 1, and the connecting frame 1 drives the first sliding beam 3 to slide out of the intermediate body 2 for a distance, so that the telescopic beam composed of the first sliding beam 3 and the second sliding beam 4 is fully extended, and then locked by the clamping mechanism 13, and then the two rear locking mechanisms 12 release the two fourth docking cylinders 10, and then the tractor drives the first sliding beam 3 to slide toward the inside of the intermediate body 2, the first sliding beam 3 drives the second sliding beam 4, and the second sliding beam 4 pushes the third sliding beam 5 to slide out, and the rear body 6 moves backward until the two third docking cylinders 9 move To the side of the two rear locking mechanisms 12, the two third docking cylinders 9 are locked by the two rear locking mechanisms 12, and the third sliding beam 5 is located outside the middle vehicle body 2; then the docking mechanism 16 releases the front docking block 14 and the rear docking block 15, the second sliding beam 4 is separated from the third sliding beam 5, and the tractor drives the first sliding beam 3 to slide outward until the two second docking cylinders 8 move to the side of the two front locking mechanisms 11, and the two second docking cylinders 8 are locked by the two front locking mechanisms 11; the first sliding beam 3 and the third sliding beam 5 are both extended to the outside of the middle vehicle body 2, fully unfolded, and have a long length, and can transport goods such as logs. ;

[0030] Furthermore, the front locking mechanism 11 includes two first electric push rods 111 and two first pin rods 112; The two first electric push rods 111 are fixedly disposed in the middle body 2 , respectively; the two first pins 112 are slidably disposed in the middle body 2 , respectively, and are fixedly connected to the output ends of the two first electric push rods 111 , respectively.

[0031] In this embodiment, the two first electric push rods 111 are used to drive the two first pins 112 to slide. When the two first pins 112 are slidably inserted into the first docking tube 7 or the second docking tube 8, the first sliding beam 3 can be locked.

[0032] Furthermore, the rear locking mechanism 12 includes two second electric push rods 121 and two second pin rods 122; The two second electric push rods 121 are respectively fixedly disposed in the middle body 2 ; the two second pins 122 are respectively slidably disposed in the middle body 2 , and are respectively fixedly connected to the output ends of the two second electric push rods 121 .

[0033] In this embodiment, the two second electric push rods 121 are used to drive the two second pins 122 to slide. When the two second pins 122 are slidably inserted into the third docking cylinder 9 or the fourth docking cylinder 10 , the third sliding beam 5 can be locked.

[0034] Furthermore, the first sliding beam 3 has a clamping hole 31; the clamping mechanism 13 includes a third electric push rod 131 and a third pin 132; the third electric push rod 131 is fixedly arranged in the second sliding beam 4; the third pin 132 is fixedly connected to the output end of the third electric push rod 131, and is slidably connected to the second sliding beam 4, and passes through the second sliding beam 4.

[0035] In this embodiment, the third pin rod 132 is adapted to the clamping hole 31. When the first sliding beam 3 slides out of the intermediate vehicle body 2, the clamping hole 31 gradually approaches the third pin rod 132. After they are fully aligned, the third electric push rod 131 drives the third pin rod 132 to slide and insert into the clamping hole 31. At this time, the first sliding beam 3 and the second sliding beam 4 are locked with each other and cannot slide relative to each other, and can only move synchronously.

[0036] Furthermore, the docking mechanism 16 includes a fourth electric push rod 161 and a fourth pin rod 162; The fourth electric push rod 161 is fixedly disposed on one side of the third sliding beam 5 ; the fourth pin 162 is fixedly disposed at the output end of the fourth electric push rod 161 .

[0037] In this embodiment, when the front docking block 14 and the rear docking block 15 are aligned with each other, the fourth electric push rod 161 pushes the fourth pin 162 to pass through the front docking block 14 and the rear docking block 15 in sequence. At this time, the front docking block 14 and the rear docking block 15 are locked together, and the second sliding beam 4 and the third sliding beam 5 are connected together.

[0038] Furthermore, the bearing assembly further includes two enclosure mechanisms 17; The two enclosure mechanisms 17 are respectively arranged on both sides of the intermediate vehicle body 2 .

[0039] In this embodiment, the two enclosure mechanisms 17 are used to conveniently block the goods from both sides and to conveniently tie and fix the goods with ropes to prevent the goods such as logs from falling.

[0040] Furthermore, the enclosure mechanism 17 includes a first rotating rod 171, a second rotating rod 172, a first connecting rod 173 and a second connecting rod 174; The first rotating rod 171 is rotatably arranged on the side of the middle vehicle body 2; the second rotating rod 172 is rotatably arranged on the side of the middle vehicle body 2; one end of the first connecting rod 173 is rotatably connected to the connecting frame 1, and the other end is rotatably connected to the first rotating rod 171; one end of the second connecting rod 174 is rotatably connected to the first rotating rod 171, and the other end is rotatably connected to the second rotating rod 172.

[0041] In this embodiment, when unloaded, the first rotating rod 171, the second rotating rod 172, the first connecting rod 173 and the second connecting rod 174 are all in a low position to reduce wind resistance. When goods need to be transported and the tractor drives the connecting frame 1 away from the intermediate vehicle body 2, the first connecting rod 173 will pull the first rotating rod 171 to rotate and stand up, and the first rotating rod 171 will pull the second rotating rod 172 to rotate and stand up through the second connecting rod 174. The first rotating rod 171, the second rotating rod 172, the first connecting rod 173 and the second connecting rod 174 cooperate to enclose the goods.

[0042] The foldable transport semi-trailer described in this embodiment, when in an unloaded state, the two front locking mechanisms 11 lock the two first docking cylinders 7, thereby locking the first sliding beam 3 and preventing it from sliding further, and the two rear locking mechanisms 12 lock the two fourth docking cylinders 10, thereby locking the third sliding beam 5 and preventing it from sliding further, the second sliding beam 4 and the third sliding beam 5 are connected together by the front docking block 14, the rear docking block 15 and the docking mechanism 16, the first sliding beam 3 and the third sliding beam 5 are both retracted in the middle body 2, the overall length is small, convenient to drive, and the wind resistance and fuel consumption are effectively reduced, and the unloaded cost is reduced; when the transported goods need to be unfolded, the two front locking mechanisms 11 release the two first docking cylinders 7, the tractor drives the connecting frame 1, and the connecting frame 1 drives the first sliding beam 3 to slide a distance outside the middle body 2, so that the telescopic beam composed of the first sliding beam 3 and the second sliding beam 4 is fully extended, and then locked by the clamping mechanism 13, and then the two rear locking mechanisms 12 are locked. The fixing mechanism 12 releases the two fourth docking cylinders 10, and then the tractor drives the first sliding beam 3 to slide toward the middle body 2, the first sliding beam 3 drives the second sliding beam 4, the second sliding beam 4 pushes the third sliding beam 5 to slide out, and the rear body 6 moves backward until the two third docking cylinders 9 move to the sides of the two rear locking mechanisms 12, at which time the two third docking cylinders 9 are locked by the two rear locking mechanisms 12, and the third sliding beam 5 is located outside the middle body 2; then the docking mechanism 16 releases the front docking block 14 and the rear docking block 15, the second sliding beam 4 is separated from the third sliding beam 5, and the tractor drives the first sliding beam 3 to slide outward until the two second docking cylinders 8 move to the sides of the two front locking mechanisms 11, and at this time the two second docking cylinders 8 are locked by the two front locking mechanisms 11; the first sliding beam 3 and the third sliding beam 5 are both extended to the outside of the middle body 2, fully unfolded, and have a long length, so that logs and other goods can be transported; When the goods are transported and the vehicle returns empty, the two front locking mechanisms 11 release the two second docking cylinders 8, and the tractor drives the first sliding beam 3 to slide toward the middle vehicle body 2, and the first sliding beam 3 drives the second sliding beam 4 to approach the third sliding beam 5 until the front docking block 14 and the rear docking block 15 are aligned, and then the docking mechanism 16 docks the front docking block 14 and the rear docking block 15 together, and the second sliding beam 4 and the third sliding beam 5 are connected together, and then the two rear locking mechanisms 12 release the two third docking cylinders 9, and then the tractor drives the first sliding beam 3 to slide outward. The second sliding beam 4 drives the third sliding beam 5 to slide toward the middle car body 2 until the two fourth docking tubes 10 move to the sides of the two rear locking mechanisms 12, and then the two fourth docking tubes 10 are locked by the two rear locking mechanisms 12, and then the clamping mechanism 13 is released, and the tractor drives the first sliding beam 3 to slide toward the middle car body 2 until the two first docking tubes 7 move to the sides of the two front locking mechanisms 11, and then the two first docking tubes 7 are locked by the two front locking mechanisms 11. At this time, the first sliding beam 3 and the third sliding beam 5 are both located in the middle car body 2.

[0043] The second embodiment of the present application is: On the basis of the first embodiment, the present invention provides a foldable transport semi-trailer system, including the foldable transport semi-trailer.

[0044] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A foldable transport semitrailer, comprising a connecting frame; characterized in that: Also included is a load-bearing assembly; The bearing assembly includes an intermediate car body, a first sliding beam, a second sliding beam, a third sliding beam, a rear car body, two first docking cylinders, two second docking cylinders, two third docking cylinders, two fourth docking cylinders, two front locking mechanisms, two rear locking mechanisms, a clamping mechanism, a front docking block, a rear docking block and a docking mechanism; The first sliding beam is slidably arranged in the middle car body and is fixedly connected to the connecting frame; the second sliding beam is slidably arranged in the first sliding beam; the third sliding beam is slidably arranged in the middle car body; the rear car body is fixedly arranged on one side of the third sliding beam; the two first docking tubes are respectively fixedly arranged on the top and bottom of the first sliding beam; the two second docking tubes are respectively fixedly arranged on the top and bottom of the first sliding beam; the two third docking tubes are respectively fixedly arranged on the top and bottom of the third sliding beam; the two fourth docking tubes are respectively fixedly arranged on the top and bottom of the third sliding beam; the two front locking mechanisms are arranged in the middle car body; the two rear locking mechanisms are arranged in the middle car body; the clamping mechanism is arranged in the second sliding beam; the front docking block is fixedly arranged on one side of the second sliding beam; the rear docking block is fixedly arranged on one side of the third sliding beam; the docking mechanism is arranged on one side of the third sliding beam.

2. A foldable transport semitrailer as claimed in claim 1, characterized in that: The front locking mechanism includes two first electric push rods and two first pin rods; The two first electric push rods are fixedly arranged in the middle body respectively; the two first pin rods are slidably arranged in the middle body respectively, and are fixedly connected with the output ends of the two first electric push rods respectively.

3. A foldable transport semitrailer as claimed in claim 2, characterized in that: The rear locking mechanism comprises two second electric push rods and two second pin rods; The two second electric push rods are respectively fixedly arranged in the middle body; the two second pin rods are respectively slidably arranged in the middle body and are respectively fixedly connected to the output ends of the two second electric push rods.

4. A foldable transport semitrailer as claimed in claim 3, characterized in that: The first sliding beam has a clamping hole; the clamping mechanism includes a third electric push rod and a third pin rod; The third electric push rod is fixedly arranged in the second sliding beam; the third pin is fixedly connected to the output end of the third electric push rod, and is slidably connected to the second sliding beam and passes through the second sliding beam.

5. A foldable transport semitrailer as claimed in claim 4, characterized in that: The docking mechanism includes a fourth electric push rod and a fourth pin rod; The fourth electric push rod is fixedly arranged at one side of the third sliding beam; the fourth pin is fixedly arranged at the output end of the fourth electric push rod.

6. A foldable transport semitrailer as claimed in claim 5, characterized in that: The bearing assembly also includes two enclosure mechanisms; The two enclosure mechanisms are respectively arranged on both sides of the middle vehicle body.

7. A foldable transport semitrailer as claimed in claim 6, characterized in that: The enclosure mechanism comprises a first rotating rod, a second rotating rod, a first connecting rod and a second connecting rod; The first rotating rod is rotatably arranged on the side of the middle vehicle body; the second rotating rod is rotatably arranged on the side of the middle vehicle body; one end of the first connecting rod is rotatably connected to the connecting frame, and the other end is rotatably connected to the first rotating rod; one end of the second connecting rod is rotatably connected to the first rotating rod, and the other end is rotatably connected to the second rotating rod.

8. A system for folding a semi-trailer, characterized in that: It comprises a foldable transport semi-trailer as described in any one of claims 1 to 7.

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