Semi-trailer for double trailers

Abstract

A semi-trailer trailer for double trailers comprises a traction trailer head and trailers, two movable traction seats on a first trailer or a second trailer can move in the central axis direction and used for adjusting the distance between the two movable traction seats, and the movable traction seats are installed at the front ends and the rear ends of the trailers so that the distance between the two movable traction seats can be adjusted. The traction seats can be matched with each other in a pulling and hanging manner, and the specific positions of the movable traction seats on the trailers can be adjusted according to use requirements, so that the total length between the two trailers can be adjusted, and the defects of the double trailers in a no-load state are overcome to a certain extent; the trailer can independently move in the horizontal state through cooperation of the telescopic rod and the supporting wheels at the bottom, the trailer is controlled to be in pull-hanging cooperation with the first traction base on the traction vehicle head, and compared with a driving traction vehicle head, the operation mode is simpler.

Description

Technical Field

[0001] The invention relates to the technical field of double trailers, and in particular to a semi-trailer for double trailers. Background Art

[0002] A double trailer is a vehicle that tows two standard semi-trailers in a row behind a standard tractor, or tows a standard semi-trailer and a mid-axle carriage. This type of vehicle can significantly increase transportation volume and efficiency, reduce transportation costs, and reduce carbon dioxide emissions and road wear, but it is more difficult to drive and is limited by the maximum allowable total mass and length of the vehicle.

[0003] The cargo carrying capacity of a double trailer is superior to that of a traditional semi-trailer, which can significantly reduce the unit cost of transportation. However, after the double trailer completes the delivery, there is still a situation where the trailer returns empty. Compared with a semi-trailer, the cargo carrying performance of a double trailer cannot be highlighted when the trailer is empty, which magnifies its shortcomings. When empty, the total length of the trailer is longer, which increases the difficulty of driving, and the vehicle stability is reduced, increasing the safety risks of driving. Summary of the invention

[0004] The present invention provides a semi-trailer for double trailers, comprising:

[0005] A tractor head, wherein the tractor head is provided with a tractor body with a first traction seat mounted on the top;

[0006] A trailer, the trailer comprising a first trailer and a second trailer sequentially towed to the rear side of the tractor body;

[0007] Wherein, two movable traction seats are installed on each of the first trailer and the second trailer, and the two movable traction seats are distributed on the front and rear sides of the trailer along the central axis of the trailer, and the movable traction seats on the first trailer and the second trailer can be locked with each other, and the two movable traction seats on the first trailer or the second trailer can be movable along the central axis direction to adjust the distance between the two movable traction seats, and when the first trailer and the second trailer overlap each other in the height direction, the total length of the first trailer and the second trailer when towing is controlled by adjusting the distance between the two movable traction seats.

[0008] Preferably, the trailer includes a trailer frame and a load-bearing wheel group fixed at the bottom of the trailer frame, the load-bearing wheel group is transmission-connected to the tractor body, two groups of guide racks symmetrically distributed along the central axis are provided in the middle position of the trailer frame, the movable traction seat is installed between the two groups of guide racks, and the movable traction seat can move along the guide racks to adjust the position of the movable traction seat on the trailer frame.

[0009] Preferably, the trailer frame includes an upper frame, a transition frame and a lower frame distributed in sequence along the length direction, the upper frame, the transition frame and the lower frame are welded and fixed to each other, and the bottom surface height of the upper frame is higher than the top surface height of the lower frame.

[0010] Preferably, the length of the lower frame in the first trailer is equal to the length of the upper frame in the second trailer, and is equal to the maximum length of the overlapping area of ​​the first trailer and the second trailer.

[0011] Preferably, the length of the overlapping area between the first trailer and the second trailer is greater than or equal to / of the length of a single trailer.

[0012] Preferably, the load-bearing wheel group is arranged at the bottom of the lower plate frame, the guide rack is arranged at the middle position of the upper plate frame and the lower plate frame, and connecting rods are fixed at both ends of the guide rack, so that the two movable traction seats are respectively restricted to move on the upper plate frame and the lower plate frame.

[0013] Preferably, the movable traction seat includes a second traction seat fixedly mounted on the top of the movable seat body and a traction pin fixedly arranged on the bottom of the movable seat body, and the second traction seat is provided with a pin hole for the traction pin to be inserted and a locking arm for locking the traction pin.

[0014] Preferably, guide grooves are provided on both sides of the movable seat body corresponding to the guide rack, and the guide grooves are slidably mounted on the outside of the guide rack. A worm gear that can be driven to rotate by an internal driver of the movable seat body is provided in the guide groove, and the worm gear is meshed with the guide rack for transmission, so as to drive the movable seat body to move along the guide rack.

[0015] Preferably, the movable traction seat on the upper plate frame also includes a telescopic rod installed on the movable seat body, and a support wheel is installed at one end of the telescopic rod away from the movable seat body. The telescopic rod controls the support wheel to contact the ground downward or to leave the ground upward by telescoping.

[0016] Preferably, a steering drive is provided at the connection between the telescopic rod and the support wheel, and the steering drive is used to control the support wheel to rotate in a horizontal direction.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] The present invention installs movable traction seats at the front and rear ends of the trailer, and the traction seats can be towed and matched with each other. The specific position of the movable traction seat on the trailer can be adjusted according to usage requirements, so that the total length between the two trailers can be adjusted, which makes up for the shortcomings of the double trailer in an unloaded state to a certain extent. At the same time, a retractable telescopic rod is arranged on the traction seat, and the trailer can independently move in a horizontal state through the cooperation of the telescopic rod and the support wheels at the bottom, and the trailer is controlled to be towed and matched with the first traction seat on the tractor head. Compared with driving the tractor head, the operation method is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which:

[0020] Figure 1 It is a schematic diagram of a loading state of a semi-trailer for double trailers shown in an embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of an unloaded state of a semi-trailer for double trailers shown in an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the side structure of a trailer shown in an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of a top view of the structure of a trailer shown in an embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of the three-dimensional structure of the movable traction seat shown in an embodiment of the present invention from the front side perspective;

[0025] Figure 6 is a schematic diagram of the three-dimensional structure of the movable fifth wheel shown in an embodiment of the present invention from a rear side perspective;

[0026] Figure 7 is a schematic diagram of the three-dimensional structure of the movable fifth wheel shown in an embodiment of the present invention from a bottom perspective;

[0027] 10. Tractor head; 11. Tractor body; 12. First traction seat; 20. Trailer; 2a. First trailer; 2b. Second trailer; 21. Trailer plate frame; 210. Reinforcing rod; 211. Upper plate frame; 212. Transition frame; 213. Lower plate frame; 22. Load-bearing wheel set; 221. Load-bearing frame; 222. Wheel set; 23. Guide rack; 231. Connecting rod; 30. Movable traction seat; 31. Movable seat body; 310. Guide slide groove; 32. Second traction seat; 320. Pin hole; 321. Guide groove; 322. Locking arm; 33. Worm; 34. Traction pin; 40. Telescopic rod; 41. Support wheel; 42. Steering drive. DETAILED DESCRIPTION

[0028] In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0029] Although a double trailer has a more prominent advantage with its double cargo capacity, its disadvantages of being long and difficult to drive are also more obvious. In particular, when the vehicle is running unloaded, it not only loses the advantage of cargo capacity, but the lighter body weight reduces the stability of the vehicle and the adhesion between the tires and the ground, which can easily lead to loss of control such as skidding or tail swinging during braking, increasing the safety hazard of driving. Based on the above, the present invention provides a semi-trailer for double trailers, aiming to make up for the shortcomings of double trailers in an unloaded state, and the double trailer includes a tractor head 10 and a trailer 20.

[0030] like Figure 1 and Figure 2 As shown, a tractor body 11 with a first traction seat 12 installed on the top is provided on the tractor head 10, and the trailer 20 includes a first trailer 2a and a second trailer 2b towed in sequence to the rear side of the tractor body 11. The tractor body 11, the first trailer 2a and the second trailer 2b are towed backwards in sequence to form a double-trailer car train to obtain double cargo space.

[0031] Among them, two movable traction seats 30 are installed on the first trailer 2a and the second trailer 2b. The two movable traction seats 30 are distributed on the front and rear sides of the trailer 20 along the central axis of the trailer 20. The two movable traction seats 30 on the first trailer 2a or the second trailer 2b can move along the central axis direction to adjust the distance between the two movable traction seats 30.

[0032] Furthermore, the movable traction seats 30 on the first trailer 2a and the second trailer 2b can be locked together, and when the first trailer 2a and the second trailer 2b overlap each other in the height direction, the total length of the first trailer 2a and the second trailer 2b when towing can be controlled by adjusting the distance between the two movable traction seats 30.

[0033] When a double trailer needs to be loaded, Figure 1As shown, the movable traction seats 30 on the first trailer 2a and the second trailer 2b are respectively moved to the front and rear ends of the trailer 20, so that the two movable traction seats 30 on the trailer 20 reach the maximum distance. At this time, the movable traction seat 30 at the front end of the first trailer 2a is towed and matched with the first traction seat 12 on the traction body 11, and the movable traction seat 30 at the front end of the second trailer 2b is towed and matched with the movable traction seat 30 at the rear end of the first trailer 2a, so that the towing length between the traction body 11, the first trailer 2a and the second trailer 2b reaches the maximum length.

[0034] When the double trailer is unloaded, Figure 2 As shown, the movable traction seats 30 on the first trailer 2a and the second trailer 2b move to the middle position respectively, so that the distance between the two movable traction seats 30 is shortened. At this time, the movable traction seat 30 at the front end of the first trailer 2a is towed and matched with the first traction seat 12 on the traction vehicle body 11, and the movable traction seat 30 at the front end of the second trailer 2b is towed and matched with the movable traction seat 30 at the rear end of the first trailer 2a. An overlapping area is presented between the first trailer 2a and the second trailer 2b, so as to reduce the total length of the vehicle, reduce the driving difficulty and improve the vehicle stability.

[0035] like Figure 3 As shown, the trailer 20 includes a trailer plate frame 21 and a load-bearing wheel group 22 fixed to the bottom of the trailer plate frame 21, and the load-bearing wheel group 22 is transmission-connected to the tractor body 11. In a specific embodiment, the load-bearing wheel group 22 includes a load-bearing frame 221 and a wheel group 222. The load-bearing frame 221 includes a frame, an axle, a wheel suspension device, a braking device and other devices and structures necessary for operation. The wheel group 222 is installed on the load-bearing frame 221 to support the movement of the load-bearing frame 221 and the trailer plate frame 21.

[0036] Furthermore, two groups of guide racks 23 symmetrically distributed along the central axis are provided in the middle position of the trailer frame 21, and the movable traction seat 30 is installed between the two groups of guide racks 23, and the movable traction seat 30 can move along the guide racks 23 to adjust the position of the movable traction seat 30 on the trailer frame 21.

[0037] In some embodiments, Figure 4 As shown, a plurality of reinforcing rods 210 are arranged along the length direction of the trailer frame 21 to increase the overall strength of the trailer frame 21. A guide rack 23 is arranged in the middle position of the trailer frame 21. Through the gap between the two sets of guide racks 23, a movable space is provided for the movable traction seat 30 to adjust the specific position of the movable traction seat 30 on the trailer frame 21 according to usage requirements.

[0038] Furthermore, in order to allow the first trailer 2a and the second trailer 2b to be staggered in the height direction when they overlap, the trailer frame 21 includes an upper frame 211, a transition frame 212 and a lower frame 213 distributed in sequence along the length direction, the upper frame 211, the transition frame 212 and the lower frame 213 are welded and fixed to each other, and the bottom surface height of the upper frame 211 is higher than the top surface height of the lower frame 213.

[0039] like Figure 1-Figure 3 As shown, when the first trailer 2a and the second trailer 2b overlap each other, the relatively higher upper frame 211 is located above the relatively lower lower frame 213, so that the total length of the first trailer 2a and the second trailer 2b is reduced.

[0040] Furthermore, in order to achieve the maximum overlapping area when the first trailer 2a and the second trailer 2b overlap and cooperate with each other, the length of the lower frame 213 in the first trailer 2a is equal to the length of the upper frame 211 in the second trailer 2b, and is equal to the maximum length of the overlapping area of ​​the first trailer 2a and the second trailer 2b.

[0041] In some embodiments, the length of the overlapping area of ​​the first trailer 2a and the second trailer 2b is greater than or equal to 1 / 2 of the length of a single trailer 20, wherein when the overlapping area of ​​the first trailer 2a and the second trailer 2b is equal to 1 / 2 of the length of a single trailer 20, it is the minimum overlapping length of the first trailer 2a and the second trailer 2b. At this time, the length of the first trailer 2a and the second trailer 2b in the unloaded state is 3 / 4 of the length of the first trailer 2a and the second trailer 2b in the fully loaded state. In order to further reduce the length of the first trailer 2a and the second trailer 2b in the unloaded state, the length of the lower frame 213 in the first trailer 2a and the length of the upper frame 211 in the second trailer 2b can be further increased. The larger the overlapping area of ​​the first trailer 2a and the second trailer 2b, the smaller the total length of the first trailer 2a and the second trailer 2b in the unloaded state.

[0042] Among them, in some preferred embodiments, the ratio of the upper frame 211 and the lower frame 213 in the first trailer 2a is set to 1:4, and the ratio of the upper frame 211 and the lower frame 213 in the second trailer 2b is set to 4:1. In this way, the length of the first trailer 2a and the second trailer 2b after overlapping is 3 / 5 of the total length of the first trailer 2a and the second trailer 2b, which greatly reduces the total length of the vehicle and compensates for the shortcomings of the double trailer in an empty state to a certain extent.

[0043] Specifically, Figure 3 and Figure 4As shown, the load-bearing wheel group 22 is arranged at the bottom of the lower plate frame 213, and the guide rack 23 is arranged at the middle position of the upper plate frame 211 and the lower plate frame 213. Connecting rods 231 are fixed at both ends of the guide rack 23, so that the two movable traction seats 30 are respectively restricted to move on the upper plate frame 211 and the lower plate frame 213.

[0044] Furthermore, the movable traction seat 30 includes a movable seat body 31, a second traction seat 32 fixedly installed on the top of the movable seat body 31, and a traction pin 34 fixedly arranged at the bottom of the movable seat body 31. The second traction seat 32 is provided with a pin hole 320 for the traction pin 34 to be inserted and a locking arm 322 for locking the traction pin 34. A guide groove 321 for guiding the traction pin 34 is also provided at the corresponding pin hole 320 on the second traction seat 32, so that the traction pin 34 can enter the pin hole 320 from the horizontal direction more easily. Generally, the locking arm 322 is controlled by or electrically controlled to limit the traction pin 34 in the pin hole 320 and prevent the traction pin 34 from falling out of the pin hole 320 when the vehicle is running.

[0045] Furthermore, guide grooves 310 are provided on both sides of the movable seat body 31 corresponding to the guide racks 23. The guide grooves 310 are slidably mounted on the outer sides of the guide racks 23. A worm 33 which can be driven to rotate by an internal driver of the movable seat body 31 is provided in the guide grooves 310. The worm 33 is meshed with the guide rack 23 for transmission, and is used to drive the movable seat body 31 to move along the guide rack 23. The movable seat body 31 is equipped with a motor for driving the worm 33 forward and reversely. The rotation direction of the worm 33 is controlled by the motor, so that the worm 33 and the guide rack 23 are meshed with each other to drive the movable seat body 31 to move forward or reversely along the guide rack 23. The cooperation mode of the worm 33 and the guide rack 23 has a strong self-locking performance, which can ensure the stability of the position of the movable traction seat 30 when the vehicle is running.

[0046] At present, the front end of the trailer 20 is generally kept horizontal by a retractable support frame, and the driver drives the tractor head 10 in a reverse manner to match the tractor head 10 with the trailer 20 to complete the towing. After the towing is locked, the support frame is retracted. However, this method requires the driver to drive the tractor head 10, and usually requires the cooperation of others, otherwise it is difficult to align the trailer, which is relatively troublesome.

[0047] like Figure 5 , Figure 6 and Figure 7 As shown, in order to reduce the difficulty of towing between the tractor head 10 and the trailer 20, the movable towing seat 30 on the upper frame 211 also includes a telescopic rod 40 installed on the movable seat body 31, and a support wheel 41 is installed at one end of the telescopic rod 40 away from the movable seat body 31. The telescopic rod 40 controls the support wheel 41 to contact the ground downward or leave the ground upward by telescoping.

[0048] Furthermore, a steering driver 42 is provided at the connection between the telescopic rod 40 and the supporting wheel 41, and the steering driver 42 is used to control the supporting wheel 41 to rotate in the horizontal direction and in the rotation direction.

[0049] In some embodiments, the telescopic rod 40 is retracted and rotated to a position parallel to the movable traction seat 30. The steering drive 42 can be controlled by a remote control. The trailer 20 can be independently supported by the telescopic rod 40 to maintain a horizontal state, and the support wheel 41 at the bottom of the telescopic rod 40 can be controlled by the remote control to rotate in a set direction to drive the entire trailer 20 to move. In this way, the driver can control the head end of the trailer 20 to tow with the first traction seat 12 on the tractor head 10, which is simpler to operate than driving the tractor head 10.

[0050] In combination with the above embodiments, by installing movable active traction seats 30 at the front and rear ends of the trailer 20, and the movable traction seats 30 can be towed and coordinated with each other, the specific position of the movable traction seat 30 on the trailer 20 can be adjusted according to the use requirements, so that the total length between the two trailers 20 can be adjusted, which makes up for the shortcomings of the double trailer in the unloaded state to a certain extent. At the same time, a retractable telescopic rod 40 is provided on the movable traction seat 30, and the trailer 20 can independently move in a horizontal state through the cooperation of the telescopic rod 40 and the support wheel 41 at the bottom, and the trailer 20 is controlled to be towed and coordinated with the first traction seat 12 on the tractor head 10. Compared with driving the tractor head 10, the operation method is simpler.

[0051] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A semi-trailer for double trailers, characterized in that: include: A tractor head (10), wherein the tractor head (10) is provided with a tractor body (11) with a first traction seat (12) mounted on the top; A trailer (20), the trailer (20) comprising a first trailer (2a) and a second trailer (2b) which are sequentially towed to the rear side of the tractor body (11); Wherein, two movable traction seats (30) are installed on both the first trailer (2a) and the second trailer (2b), and the two movable traction seats (30) are distributed on the front and rear sides of the trailer (20) along the central axis of the trailer (20), and the movable traction seats (30) on the first trailer (2a) and the second trailer (2b) can be locked with each other, and the two movable traction seats (30) on the first trailer (2a) or the second trailer (2b) can be movable along the central axis direction to adjust the distance between the two movable traction seats (30), and when the first trailer (2a) and the second trailer (2b) overlap each other in the height direction, the total length of the first trailer (2a) and the second trailer (2b) when towing is controlled by adjusting the distance between the two movable traction seats (30).

2. A double trailer semitrailer according to claim 1, characterized in that: The trailer (20) comprises a trailer frame (21) and a load-bearing wheel group (22) fixed at the bottom of the trailer frame (21); the load-bearing wheel group (22) is drivingly connected to the tractor body (11); two groups of guide racks (23) symmetrically distributed along a central axis are provided at the middle position of the trailer frame (21); the movable traction seat (30) is installed between the two groups of guide racks (23); and the movable traction seat (30) can move along the guide racks (23) to adjust the position of the movable traction seat (30) on the trailer frame (21).

3. A double trailer semitrailer according to claim 2, characterized in that: The trailer frame (21) comprises an upper frame (211), a transition frame (212) and a lower frame (213) which are sequentially distributed along the length direction; the upper frame (211), the transition frame (212) and the lower frame (213) are welded and fixed to each other, and the bottom surface height of the upper frame (211) is higher than the top surface height of the lower frame (213).

4. A double trailer semitrailer according to claim 3, characterized in that: The length of the lower frame (213) in the first trailer (2a) is equal to the length of the upper frame (211) in the second trailer (2b), and is equal to the maximum length of the overlapping area of ​​the first trailer (2a) and the second trailer (2b).

5. The double trailer semitrailer according to claim 4, characterized in that: The length of the overlapping area between the first trailer (2a) and the second trailer (2b) is greater than or equal to 1 / 2 of the length of a single trailer (20).

6. The double trailer semitrailer according to claim 3, characterized in that: The load-bearing wheel group (22) is arranged at the bottom of the lower plate frame (213), and the guide rack (23) is arranged at the middle position of the upper plate frame (211) and the lower plate frame (213). Connecting rods (231) are fixedly provided at both ends of the guide rack (23), so that the two movable traction seats (30) are respectively restricted to move on the upper plate frame (211) and the lower plate frame (213).

7. The double trailer semitrailer according to claim 3, characterized in that: The movable traction seat (30) comprises a movable seat body (31), a second traction seat (32) fixedly mounted on the top of the movable seat body (31), and a traction pin (34) fixedly arranged on the bottom of the movable seat body (31); the second traction seat (32) is provided with a pin hole (320) for the traction pin (34) to be inserted and received, and a locking arm (322) for locking the traction pin (34).

8. The semi-trailer for double trailers according to claim 7, characterized in that: Guide grooves (310) are provided on both sides of the movable seat body (31) corresponding to the guide rack (23); the guide grooves (310) are slidably sleeved on the outer side of the guide rack (23); a worm (33) which can be driven to rotate by an internal driver of the movable seat body (31) is provided in the guide grooves (310); the worm (33) is meshed with the guide rack (23) for transmission, and is used to drive the movable seat body (31) to move along the guide rack (23).

9. The semi-trailer for double trailers according to claim 7, characterized in that: The movable traction seat (30) on the upper plate frame (211) further comprises a telescopic rod (40) mounted on the movable seat body (31); a support wheel (41) is mounted on one end of the telescopic rod (40) away from the movable seat body (31); the telescopic rod (40) controls the support wheel (41) to contact the ground downward or to leave the ground upward by telescoping.

10. The semi-trailer for double trailers according to claim 9, characterized in that: A steering driver (42) is provided at the connection between the telescopic rod (40) and the supporting wheel (41), and the steering driver (42) is used to control the supporting wheel (41) to rotate in a horizontal direction.

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