CN112429119B

CN112429119B - Same-track traction trailer

Info

Publication number: CN112429119B
Application number: CN202011354804.3A
Authority: CN
Inventors: 付文辉; 谢峰; 陈向长
Original assignee: Shanghai Sikeqi Intelligent Equipment Technology Co ltd
Current assignee: Shanghai Sikeqi Intelligent Equipment Technology Co ltd; Ningde Sikeqi Intelligent Equipment Co Ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2022-10-04
Anticipated expiration: 2040-11-27
Also published as: CN112429119A

Abstract

The invention relates to the technical field of transport vehicles, in particular to a same-track traction trailer, which comprises: a vehicle body; the front wheel assembly is rotatably arranged on the front side of the bottom of the vehicle body; the rear wheel assembly is rotatably arranged at the rear side of the bottom of the vehicle body, and the front wheel assembly and the rear wheel assembly jointly support the vehicle body to run; two ends of the connecting rod component are respectively hinged with the diagonal positions of the front wheel component and the rear wheel component; and a drawbar assembly coupled with the front wheel assembly. When turning to, the traction bar subassembly rotates and drives the front wheel subassembly and takes place to rotate, can drive the motion of connecting rod subassembly to drive the rear wheel subassembly by the connecting rod subassembly and rotate, realize turning to of front wheel subassembly and rear wheel subassembly, the mode that turns to of this kind of direct transmission can adjust the turning to of front wheel subassembly and rear wheel subassembly in a flexible way through the connecting rod subassembly, avoids the driving track to take place the skew, guarantees to pull the trailer and moves on fixed orbit, realizes that all pull the trailer moves with the orbit.

Description

Same-track traction trailer

Technical Field

The invention relates to the technical field of transport vehicles, in particular to a same-track traction trailer.

Background

At present, in workshops or warehouses in many logistics industries and other industries, due to the limitation of fields, a reserved passage space is very narrow, related goods are transported by means of a transport trolley in the industries, and due to the fact that the goods to be transported are different, the goods are difficult to stack in a container mode and are generally transported in a trailer mode.

Because the quantity in trailer carriage can increase and decrease along with actual need, consequently under the more circumstances of goods, the towed trailer carriage quantity of head car also can be more, whole traction length also can corresponding increase, can make whole transportation trailer more difficult control, especially when turning through constrictive passageway or, back trailer is according to inertia and the effect of traction under, the skew often can take place for the traffic track, cause the drive car and pull the inconsistent condition of trailer orbit, so not only can not provide convenience for work, cause the damage of passageway equipment or personnel, still can bring extra trouble, can't satisfy customer's user demand comprehensively. In addition, under some circumstances, in a narrow space, a single trailer needs to be laterally pushed or turned around on site, and the conventional trailer cannot meet the use requirement.

Disclosure of Invention

The invention aims to solve the technical problem of providing a traction trailer with the same track, which can avoid the deviation of the driving track and realize the operation with the same track so as to overcome the defects in the prior art.

In order to solve the technical problem, the invention adopts the following technical scheme: a co-track tractor trailer comprising: a vehicle body; the front wheel assembly is rotatably arranged on the front side of the bottom of the vehicle body; the rear wheel assembly is rotatably arranged at the rear side of the bottom of the vehicle body, and the front wheel assembly and the rear wheel assembly jointly support the vehicle body to run; the two ends of the connecting rod component are respectively hinged with the diagonal positions of the front wheel component and the rear wheel component; and a drawbar assembly coupled with the front wheel assembly.

Preferably, the front wheel subassembly is including rotationally locating the front wheel fixing base of bottom of the car body front side and locating the preceding directive wheel at front wheel fixing base both ends, is equipped with the preceding mounting panel that is used for connecting the connecting rod subassembly and is used for connecting the mounting bracket of traction bar subassembly on the front wheel fixing base.

Preferably, the rear wheel subassembly is including rotationally locating the rear wheel fixing base of automobile body bottom rear side and locating the rear directional wheel at rear wheel fixing base both ends, is equipped with the rear mounting panel that is used for connecting the connecting rod subassembly on the rear wheel fixing base.

Preferably, the length of the connecting rod assembly is adjustable.

Preferably, the traction rod assembly comprises a mounting seat for connecting the front wheel assembly, a traction rod with one end hinged on the mounting seat, a connecting piece arranged at the other end of the traction rod and a pull handle arranged on the traction rod with an adjustable mounting angle.

Preferably, the rear end of the vehicle body is provided with a tail hook.

Preferably, the left side and the right side of the bottom of the vehicle body are both provided with a fixed switching assembly, and the fixed switching assembly comprises an auxiliary wheel fixing seat arranged at the bottom of the vehicle body in a lifting manner, universal wheels arranged at two ends of the auxiliary wheel fixing seat and a driving mechanism for driving the auxiliary wheel fixing seat to lift.

Preferably, the top of the auxiliary wheel fixing seat is provided with a connecting shaft, the vehicle body is provided with a linear bearing, and the connecting shaft is connected with the linear bearing in a matched mode.

Preferably, the top of jockey pulley fixing base is equipped with guide post, preforming and spring, and the automobile body is passed movably to the guide post, and the top of guide post is located to the preforming, and the guide post is located to the spring housing and roof pressure in between preforming and the automobile body.

Preferably, the bottom of the vehicle body is provided with a groove frame, the groove frame is formed with a plugging groove, the driving mechanism comprises a pressing rod which is contacted with the top of the auxiliary wheel fixing seat, one end of the pressing rod is hinged on the vehicle body, the other end of the pressing rod is movably inserted into the plugging groove, the plugging groove is provided with an upper clamping portion and a lower clamping portion which are matched with the pressing rod in a clamping manner, and the upper clamping portion is located above the lower clamping portion.

Compared with the prior art, the invention has the remarkable progress that:

according to the same-track traction trailer, the front wheel assembly and the rear wheel assembly are rotatably arranged at the bottom of the trailer body and are connected through the connecting rod assembly to form the connecting rod linkage mechanism, when the trailer steers, the traction rod assembly rotates to drive the front wheel assembly to rotate so as to drive the connecting rod assembly to move, and the connecting rod assembly drives the rear wheel assembly to rotate so as to realize steering of the front wheel assembly and the rear wheel assembly. The same-track traction trailer has the advantages of simple structure, convenience in use and strong functionality.

Drawings

FIG. 1 is a schematic front view of a co-track tractor-trailer according to an embodiment of the present invention.

Fig. 2 is a schematic bottom view of the co-track tractor trailer of fig. 1 (with the left side dead man switching assembly removed).

Fig. 3 is a schematic bottom view of the co-track tractor trailer of fig. 1 (with the left side dead man switching assembly removed) in a steering mode.

Fig. 4 is a schematic view of the front wheel assembly of the co-track tractor trailer of fig. 1.

Fig. 5 is a schematic view of the rear wheel assembly of the co-track tractor trailer of fig. 1.

Fig. 6 is a schematic view of the coupling rod assembly of the co-track tractor trailer of fig. 1.

Fig. 7 is a schematic view of the structure of the drawbar assembly in the co-track tractor trailer of fig. 1.

Fig. 8 is a schematic view of the same track trailer of fig. 1 with the pull handle of the drawbar assembly collapsed.

Figure 9 is a front view of two of the tractor-trailer of figure 1 coupled together.

Fig. 10 is an enlarged schematic view of a portion a in fig. 9.

Fig. 11 is an enlarged view of a portion a of fig. 9 from another view angle.

Fig. 12 is a schematic structural view of a fixed switching assembly in the same-track tractor trailer shown in fig. 1.

Fig. 13 is a front partially cross-sectional view of the same-track tractor trailer of fig. 1 with the fixed switching assembly assembled with the body.

Fig. 14 is a schematic view of the same track trailer of fig. 1 with the switch assembly depressed.

Fig. 15 is a schematic front view of the same-track tractor trailer shown in fig. 1 when making a fixed switch.

Wherein the reference numerals are as follows:

1. vehicle body 2, front wheel assembly

21. Front wheel fixing seat 22 and front steering wheel

23. Front wheel bearing mounting shaft 24 and front wheel adapter seat

25. Front mounting plate 26 and mounting frame

3. Rear wheel assembly 31 and rear wheel fixing seat

32. Rear directional wheel 33, rear wheel bearing mounting shaft

34. Rear wheel adapter seat 35 and rear mounting plate

4. Connecting rod assembly 41 and connecting rod

42. Adjusting rod 43 and joint bearing

44. Joint bearing installation shaft 5 and traction rod assembly

51. Mounting seat 52 and traction rod

53. Connecting piece 54, handle

55. Articulated shaft 56, knob plunger

57. Clamp 571 and push rod

572. Rotating handle 58 and shifting fork

581. Horizontal bottom plate 582 and vertical side plate

583. Clamping groove 6 and tail hook

61. Tail hook bracket 62 and tail hook ball head

7. Decide ten thousand switching components 71, auxiliary wheel fixing base

72. Universal wheel 731 and connecting shaft

732. Linear bearing 741 and guide post

742. Pressure sheet 743, spring

75. Slot frame 751 and insertion slot

751a, upper clamp portion 751b, and lower clamp portion

76. Pressure lever 77, auxiliary shaft

78. Joint 79 and pin shaft

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1 to 15, one embodiment of the co-track tractor trailer of the present invention. The same-track traction trailer of the embodiment can be connected with a driving vehicle for providing power, runs under the traction of the driving vehicle, and can also be connected with one or more same-track traction trailers of the embodiment in series for use. In the description of the present invention, the front side refers to the left side of the paper of fig. 1, the back side refers to the right side of the paper of fig. 1, the bottom side refers to the lower side of the paper of fig. 1, the bottom side is also referred to as the lower side, the top side refers to the upper side of the paper of fig. 1, the top side is also referred to as the upper side, the left side refers to the paper outside of the paper of fig. 1, and the right side refers to the paper inside of the paper of fig. 1; the front-rear direction is also referred to as the horizontal direction, and the up-down direction is also referred to as the vertical direction.

Referring to fig. 1 and 2, the co-track tractor trailer of the present embodiment includes a vehicle body 1, a front wheel assembly 2, a rear wheel assembly 3, a connecting rod assembly 4, and a drawbar assembly 5. Wherein, the automobile body 1 is the horizontal setting, and automobile body 1 is used for loading the goods of being transported. The front wheel assembly 2 is rotatably arranged at the front side of the bottom of the vehicle body 1, and the rotating center of the front wheel assembly 2 is a vertical axis. The rear wheel assembly 3 is rotatably arranged at the rear side of the bottom of the vehicle body 1, the rotating center of the rear wheel assembly 3 is also a vertical axis, and the rotating center of the rear wheel assembly 3 and the rotating center of the front wheel assembly 2 are positioned on the same horizontal line. The front wheel assembly 2 and the rear wheel assembly 3 support the vehicle body 1 to operate together. In an initial state, the front wheel assembly 2 and the rear wheel assembly 3 are arranged in the left-right direction and are parallel to each other, and the front wheel assembly 2 and the rear wheel assembly 3 support the vehicle body 1 to move along the horizontal direction together. The both ends of tie rod assembly 4 are articulated mutually with the diagonal position of front wheel subassembly 2 and rear wheel subassembly 3 respectively, for example, the front end of tie rod assembly 4 is articulated mutually with the right-hand member of front wheel subassembly 2, and the rear end of tie rod assembly 4 is then articulated mutually with the left end of rear wheel subassembly 3. The front wheel assembly 2 and the rear wheel assembly 3 are connected through the connecting rod assembly 4 to form a connecting rod linkage mechanism, when the front wheel assembly 2 rotates, the connecting rod assembly 4 can be driven to move, and the connecting rod assembly 4 drives the rear wheel assembly 3 to rotate. The traction rod assembly 5 is connected with the front wheel assembly 2, and the traction rod assembly 5 transmits traction force to the front wheel assembly 2 so as to drive the front wheel assembly 2 and drive the rear wheel assembly 3 to operate. The drawbar assembly 5 may be coupled to the powered drive vehicle or to the co-track tractor trailer of the other embodiment or may be manually pushed or pulled directly by the operator, so that the traction may be provided by the drive vehicle coupled to the drawbar assembly 5 or the co-track tractor trailer of the other embodiment or by the operator manually pushing or pulling. In the initial state, traction force is applied to the traction rod assembly 5 in the horizontal direction, so that the front wheel assembly 2 and the rear wheel assembly 3 jointly support the vehicle body 1 to run in the horizontal direction; when turning is needed, referring to fig. 3, the traction force is turned, the traction rod assembly 5 rotates along with the turning and drives the front wheel assembly 2 to rotate, so that the connecting rod assembly 4 is driven to move and the connecting rod assembly 4 drives the rear wheel assembly 3 to rotate, the turning of the front wheel assembly 2 and the rear wheel assembly 3 is realized, and the front wheel assembly 2 and the rear wheel assembly 3 jointly support the vehicle body 1 to turn and run along with the change of the traction force direction. The steering mode of this kind of direct transmission can avoid the driving track to take place the skew through the nimble steering of adjusting front wheel subassembly 2 and rear wheel subassembly 3 of connecting rod subassembly 4, guarantees to pull the trailer and moves on fixed orbit, realizes that all pull the trailer and move with the orbit.

Referring to fig. 2 and 4, in the present embodiment, the front wheel assembly 2 preferably includes a front wheel holder 21 and a front steering wheel 22. The front wheel fixing seat 21 is rotatably arranged at the front side of the bottom of the vehicle body 1, and preferably, the middle part of the front wheel fixing seat 21 is rotatably arranged at the middle part of the front side of the bottom of the vehicle body 1 around a vertical axis. The front wheel fixing seat 21 can be rotatably installed at the bottom of the vehicle body 1 through a front wheel bearing (not shown in the figure), a front wheel bearing installing shaft 23 is arranged in the middle of the front wheel fixing seat 21, the front wheel bearing is installed and fixed on the vehicle body 1, and the front wheel bearing installing shaft 23 is connected with the front wheel bearing in a matching mode. The number of the front directional wheels 22 is two, the two front directional wheels 22 are respectively disposed at the left and right ends of the front wheel fixing seat 21, and preferably, the left and right ends of the front wheel fixing seat 21 are respectively disposed with a front wheel adapter seat 24 for respectively mounting and fixing the two front directional wheels 22. The front wheel fixing seat 21 is provided with a front mounting plate 25 and a mounting frame 26. Preceding mounting panel 25 is used for connecting rod assembly 4, and preferably, preceding mounting panel 25 is located the rear side of front wheel fixing base 21 right-hand member, and the front end of connecting rod assembly 4 is articulated mutually with preceding mounting panel 25. The mounting bracket 26 is used for connecting the drawbar assembly 5, and preferably, the mounting bracket 26 is provided at a front side of a middle portion of the front wheel fixing base 21.

Referring to fig. 2 and 5, in the present embodiment, the rear wheel assembly 3 preferably includes a rear wheel holder 31 and a rear directional wheel 32. The rear wheel fixing seat 31 is rotatably disposed at the rear side of the bottom of the vehicle body 1, and preferably, the middle of the rear wheel fixing seat 31 is rotatably disposed at the middle of the rear side of the bottom of the vehicle body 1 around a vertical axis. The rear wheel fixing seat 31 can be rotatably installed at the bottom of the vehicle body 1 through a rear wheel bearing (not shown in the figure), a rear wheel bearing installing shaft 33 is arranged in the middle of the rear wheel fixing seat 31, the rear wheel bearing is installed and fixed on the vehicle body 1, and the rear wheel bearing installing shaft 33 is connected with the rear wheel bearing in a matching mode. The number of the rear directional wheels 32 is two, the two rear directional wheels 32 are respectively disposed at the left and right ends of the rear wheel fixing seat 31, and preferably, the left and right ends of the rear wheel fixing seat 31 are respectively disposed with a rear wheel adapter seat 34 for respectively mounting and fixing the two rear directional wheels 32. Be equipped with rear mounting panel 35 on rear wheel fixing base 31, rear mounting panel 35 is used for connecting rod assembly 4, and preferably, rear mounting panel 35 locates the front side of rear wheel fixing base 31 left end, and connecting rod assembly 4's rear end is articulated mutually with rear mounting panel 35.

In the present embodiment, it is preferable that the length of the link assembly 4 is adjustable to ensure that the front wheel assembly 2 and the rear wheel assembly 3 in the initial state are both arranged in the left-right direction to be parallel to each other. Referring to fig. 6, the connecting rod assembly 4 may include a connecting rod 41 and an adjusting rod 42, the adjusting rod 42 is connected with the connecting rod 41 through a screw-thread fit, the adjustment of the overall length of the connecting rod assembly 4 may be realized by rotating the adjusting rod 42 or the connecting rod 41, preferably, the adjusting rod 42 is provided with two, two ends of the connecting rod 41 are respectively connected with the two adjusting rods 42 through screw-threads, a three-section connecting rod assembly 4 is formed, and the adjusting rod assembly has the advantages of convenience in adjustment and large adjustable range.

Referring to fig. 2 and fig. 6, in this embodiment, preferably, the front end and the rear end of the connecting rod assembly 4 may be respectively provided with a joint bearing 43, the two joint bearings 43 are respectively sleeved on a joint bearing mounting shaft 44, and the two joint bearing mounting shafts 44 are respectively connected with the front mounting plate 25 on the front wheel assembly 2 and the rear mounting plate 35 on the rear wheel assembly 3, so as to realize the hinge joint between the front end and the rear end of the connecting rod assembly 4 and the front wheel assembly 2 and the rear wheel assembly 3, respectively.

Referring to fig. 2 and 7, in the present embodiment, the drawbar assembly 5 preferably includes a mounting base 51, a drawbar 52, a coupling member 53 and a drawbar 54. The mounting seat 51 is used for connecting the front wheel assembly 2, and the mounting seat 51 is fixedly connected with the mounting frame 26 of the front wheel assembly 2. The rear end of the drawbar 52 is hinged to the mounting seat 51 through a hinge shaft 55, and the axis of the hinge shaft 55 extends in the left-right direction, so that the drawbar 52 can rotate back and forth in the vertical plane around the hinge shaft 55. A coupling 53 is provided at the forward end of the tow bar 52, the coupling 53 being for coupling to a drive vehicle or another co-track towing trailer of the present embodiment, the coupling 53 preferably being a ball joint connector. The pull handle 54 is arranged at the front end of the traction rod 52, and the pull handle 54 can be conveniently operated by a person. The pull handle 54 is arranged on the traction rod 52 in an adjustable angle, and preferably, the pull handle 54 can be arranged on the traction rod 52 through a knob plunger 56, the axis of the knob plunger 56 extends along the left-right direction, and when the knob plunger 56 is screwed, the pull handle 54 can be fixed on the traction rod 52; when the knob plunger 56 is unscrewed, the handle 54 can be rotated to realize the adjustment of the installation angle of the handle 54 on the traction rod 52, and after the adjustment is in place, the knob plunger 56 is screwed down to fix the handle 54. Referring to fig. 8 and 9, when the coupler 53 is coupled to a drive cart or another co-track tractor trailer of this embodiment, the pull handle 54 may be pivoted rearwardly to fold the pull handle 54 over the tow bar 52 to avoid the pull handle 54 interfering with the coupling assembly of the drive cart or another co-track tractor trailer of this embodiment to the coupler 53.

Referring to fig. 1 and 2, in the present embodiment, preferably, the rear end of the vehicle body 1 is provided with a tail hook 6, and the tail hook 6 is used for connecting a connecting piece 53 of a drawbar assembly 5 of the co-track towing trailer of another embodiment, so as to realize the connection of the co-track towing trailer of the two embodiments. Preferably, the tail hook 6 includes a tail hook bracket 61 and a tail hook ball 62, the tail hook bracket 61 is fixedly installed at the rear end of the vehicle body 1, and the tail hook ball 62 is fixedly installed on the tail hook bracket 61. Referring to fig. 9, 10 and 11, in both embodiments of the tractor trailer, the coupler 53 (ball connector) of the trailing trailer fits over the hitch ball 62 of the preceding trailer. To increase the stability of the connection between the two trailers, the front end of the tow bar 52 of the tow bar assembly 5 may be preferably provided with a clamp 57 and a fork 58, the fork 58 being movably provided on the tow bar 52 in a horizontal direction, the clamp 57 acting on the fork 58 to move or fix the fork 58. Referring to fig. 10 and 11, the shifting fork 58 includes a horizontal bottom plate 581 and a vertical side plate 582 vertically connected to form an L-shape, the horizontal bottom plate 581 is located at the bottom of the drawbar 52, a locking groove 583 is formed on the front end surface of the horizontal bottom plate 581, the vertical side plate 582 is connected with the rear end of the horizontal bottom plate 581, and the vertical side plate 582 passes through the drawbar 52 and extends out of the top of the drawbar 52. The clamp 57 is arranged at the top of the traction rod 52, the clamp 57 comprises a push rod 571 and a rotating handle 572, the push rod 571 is arranged horizontally, the front end of the push rod 571 is connected with the vertical side plate 582, and the rear end of the push rod 571 and the lower end of the rotating handle 572 are hinged on the traction rod 52. The rotating handle 572 is rotated to drive the push rod 571 to move back and forth, so as to drive the shifting fork 58 to move back and forth. After the connecting piece 53 (ball head connector) of the rear trailer is sleeved on the tail hook ball head 62 of the front trailer, the rotating handle 572 of the rear trailer can be rotated to push the shifting fork 58 to move forwards until the clamping groove 583 of the shifting fork 58 is inserted and tightly abutted on the tail hook bracket 61 of the front trailer, so that the state is maintained, the traction rod 52 of the rear trailer and the tail hook bracket 61 of the front trailer can be relatively fixed through the abutting action of the shifting fork 58, and the connecting piece 53 is prevented from being separated from the tail hook ball head 62.

In order to realize the functions of side pushing and in-situ turning of the same-track towing trailer in the embodiment, referring to fig. 2, preferably, the fixed ten thousand switching assemblies 7 are arranged on the left and right sides of the bottom of the trailer body 1, and the fixed ten thousand switching assemblies 7 on the left and right sides of the bottom of the trailer body 1 are symmetrically arranged. Referring to fig. 2, 12 and 13, the fixed switching assembly 7 includes a sub-wheel holder 71, a universal wheel 72 and a driving mechanism. The auxiliary wheel fixing base 71 is arranged at the bottom of the vehicle body 1 in a liftable manner, and the auxiliary wheel fixing base 71 is arranged along the horizontal direction. Two universal wheels 72 are provided, and the two universal wheels 72 are respectively and fixedly installed at the front end and the rear end of the auxiliary wheel fixing seat 71. The driving mechanism is used for driving the auxiliary wheel fixing seat 71 to lift. When the front wheel assembly 2 and the rear wheel assembly 3 jointly support the vehicle body 1 to run, the front directional wheel 22 of the front wheel assembly 2 and the rear directional wheel 32 of the rear wheel assembly 3 land on the ground, the auxiliary wheel fixing seat 71 is located at an initial position, and the universal wheel 72 is suspended at the initial position, at this time, the fixed switching assembly 7 does not influence the normal running of the same-track traction trailer of the embodiment. When the side push or the in-situ turning is needed, the auxiliary wheel fixing seat 71 can be driven by the driving mechanism to descend to drive the universal wheel 72 to descend and land, the vehicle body 1 is jacked up, the vehicle body 1 drives the front wheel component 2 and the rear wheel component 3 to ascend integrally, the front directional wheel 22 and the rear directional wheel 32 are suspended in the air, the fixed universal switching is realized, the universal wheels 72 of the fixed universal switching components 7 on the left side and the right side of the vehicle body 1 support the vehicle body 1 to operate together, and the functions of the side push and the in-situ turning of the same-track traction trailer of the embodiment can be realized. After the side pushing or turning-around is finished, the auxiliary wheel fixing seat 71 can be driven by the driving mechanism to ascend, the universal wheel 72 is driven to ascend and suspend in the air, the vehicle body 1 drives the front wheel component 2 and the rear wheel component 3 to integrally descend, the front directional wheel 22 and the rear directional wheel 32 land, and the state that the front wheel component 2 and the rear wheel component 3 jointly support the vehicle body 1 to run is recovered.

Referring to fig. 12 and 13, in the present embodiment, preferably, a connecting shaft 731 is disposed at the top of the auxiliary wheel fixing seat 71, a linear bearing 732 is disposed on the vehicle body 1, the connecting shaft 731 is connected to the linear bearing 732 in a matching manner, and both the axis of the connecting shaft 731 and the axis of the linear bearing 732 extend in the vertical direction, so that the auxiliary wheel fixing seat 71 can be installed on the vehicle body 1 in a lifting manner. Preferably, a connecting shaft 731 is disposed on each of the front and rear sides of the top of the auxiliary wheel fixing seat 71, and correspondingly, two linear bearings 732 are disposed on the vehicle body 1 and are respectively connected to the two connecting shafts 731 in a matching manner.

Referring to fig. 12 and 13, in the present embodiment, preferably, a guide post 741, a pressing sheet 742 and a spring 743 are disposed at the top of the auxiliary wheel fixing seat 71. The lower end of the guide post 741 is fixed on the auxiliary wheel fixing seat 71, the upper end of the guide post 741 movably penetrates through the vehicle body 1, the pressing sheet 742 is fixed at the top end of the guide post 741, the spring 743 is sleeved on the guide post 741, and the spring 743 elastically pushes against between the pressing sheet 742 and the vehicle body 1. When the driving mechanism drives the auxiliary wheel fixing seat 71 to descend, the auxiliary wheel fixing seat 71 drives the guide post 741 and the pressing sheet 742 to descend relative to the vehicle body 1, so that the pressing sheet 742 compresses the spring 743; when the driving mechanism drives the auxiliary wheel fixing seat 71 to ascend, the pressure acting on the spring 743 disappears, the spring 743 automatically and elastically recovers, and the elastic force of the spring can act on the auxiliary wheel fixing seat 71 and the vehicle body 1, so that the auxiliary wheel fixing seat 71 and the vehicle body 1 can be restored. Preferably, a set of guiding posts 741, a pressing plate 742 and a spring 743 are disposed at the front and rear sides of the top of the auxiliary wheel fixing base 71.

Referring to fig. 12, 13 and 14, in the present embodiment, preferably, a slot frame 75 is fixedly arranged at the bottom of the vehicle body 1, the slot frame 75 is formed with an insertion slot 751, the driving mechanism includes a press rod 76, and a part of the outer peripheral surface of the press rod 76 contacts with the top of the auxiliary wheel fixing seat 71. One end of the pressing rod 76 is hinged to the vehicle body 1, preferably, the vehicle body 1 may be provided with an auxiliary shaft 77, the auxiliary shaft 77 is vertically disposed, the upper end of the auxiliary shaft 77 is fixedly connected to the bottom of the vehicle body 1, the lower end of the auxiliary shaft 77 is provided with a joint 78, the joint 78 can rotate around the axis of the auxiliary shaft 77, the joint 78 is provided with a pin 79, the axis of the pin 79 extends substantially in the horizontal direction, the pressing rod 76 is disposed substantially in the left-right direction, and one end of the pressing rod 76 is rotatably sleeved on the pin 79, thereby realizing the hinging of one end of the pressing rod 76 and the vehicle body 1. The other end of the pressing rod 76 is movably inserted into the insertion groove 751, the insertion groove 751 is provided with an upper clamping portion 751a and a lower clamping portion 751b which are in clamping fit with the pressing rod 76, the upper clamping portion 751a is positioned above the side of the lower clamping portion 751b, and one end of the pressing rod 76 inserted into the insertion groove 751 can be changed between a position where the pressing rod is clamped in the upper clamping portion 751a and a position where the pressing rod is clamped in the lower clamping portion 751b, and the change can be realized by manually operating the pressing rod 76. Referring to fig. 12 and 13, in the initial position of the auxiliary wheel fixing seat 71, one end of the pressing rod 76 inserted into the insertion groove 751 is clamped in the upper clamping portion 751a, and the universal wheel 72 is suspended. Referring to fig. 14, when a lateral push or a pivot turn is required, the pressing rod 76 can be manually pressed down, so that one end of the pressing rod 76 inserted into the insertion groove 751 moves down from the upper clamping portion 751a into the lower clamping portion 751b and is clamped and fixed in the lower clamping portion 751b, and in the process, the pressing rod 76 presses down the auxiliary wheel fixing seat 71 to realize the descending of the auxiliary wheel fixing seat 71, the landing of the universal wheel 72 and the suspension of the front directional wheel 22 and the rear directional wheel 32, that is, the fixed universal switching is realized. After the side pushing or the in-situ U-turn is completed, the pressing rod 76 can be manually lifted, so that one end of the pressing rod 76 inserted into the inserting groove 751 is moved upwards from the lower clamping portion 751b to the upper clamping portion 751a and is clamped and fixed in the upper clamping portion 751a, and in the process, the auxiliary wheel fixing seat 71 and the vehicle body 1 are reset under the elastic force of the spring 743. Preferably, the middle of the auxiliary wheel fixing seat 71 is recessed to form a U-shaped groove, and the pressing rod 76 is in contact fit with the auxiliary wheel fixing seat 71 in the U-shaped groove. For the convenience of assembly, the top of the slot frame 75 is fixedly installed at the bottom of the vehicle body 1, and the insertion groove 751 of the slot frame 75 is a groove formed on the lower surface of the slot frame 75 and penetrating the left and right side surfaces of the slot frame 75.

Referring to fig. 15, when performing a side push or a pivot turn after the fixed universal switching, the drawbar 52 may be rotated about the hinge shaft 55 in a vertical plane to a vertical state, so that the drawbar assembly 5 is erected integrally, which may facilitate an operation in a narrow passage.

In conclusion, the same-track traction trailer of the embodiment can realize the same-track operation during steering, can realize the constant-speed switching to perform side pushing or in-situ turning operation, and has the advantages of simple structure, convenience in use and strong functionality.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A co-track tractor trailer, comprising:

a vehicle body (1);

the front wheel assembly (2) is rotatably arranged on the front side of the bottom of the vehicle body (1);

the rear wheel assembly (3) is rotatably arranged at the rear side of the bottom of the vehicle body (1), and the front wheel assembly (2) and the rear wheel assembly (3) jointly support the vehicle body (1) to run;

the two ends of the connecting rod component (4) are respectively hinged with the diagonal positions of the front wheel component (2) and the rear wheel component (3); and

a traction rod assembly (5) connected with the front wheel assembly (2);

the left side and the right side of the bottom of the vehicle body (1) are respectively provided with a fixed switching assembly (7), and each fixed switching assembly (7) comprises an auxiliary wheel fixing seat (71) arranged at the bottom of the vehicle body (1) in a lifting manner, universal wheels (72) arranged at two ends of the auxiliary wheel fixing seat (71) and a driving mechanism for driving the auxiliary wheel fixing seat (71) to lift;

the bottom of the vehicle body (1) is provided with a slot frame (75), the slot frame (75) is provided with an insertion slot (751), the driving mechanism comprises a pressure lever (76) which is in contact with the top of the auxiliary wheel fixing seat (71), one end of the pressure lever (76) is hinged to the bottom of the vehicle body (1), the other end of the pressure lever is movably inserted into the insertion slot (751), the insertion slot (751) is provided with an upper clamping part (751 a) and a lower clamping part (751 b) which are in clamping fit with the pressure lever (76), the upper clamping part (751 a) is positioned above the lower clamping part (751 b), one end of the pressure lever (76) inserted into the insertion slot (751) can be changed between the position of clamping the upper clamping part (751 a) and the position of clamping the lower clamping part (751 b), and the change is realized by manually operating the pressure lever (76);

the front end of a traction rod (52) of the traction rod assembly (5) is provided with a clamp (57) and a shifting fork (58), the shifting fork (58) is movably arranged on the traction rod (52) along the horizontal direction, the clamp (57) acts on the shifting fork (58) to enable the shifting fork (58) to move or be fixed, the shifting fork (58) comprises a horizontal bottom plate (581) and a vertical side plate (582) which are vertically connected to form an L shape, the horizontal bottom plate (581) is positioned at the bottom of the traction rod (52), a clamping groove (583) is formed in the front end face of the horizontal bottom plate (581), the vertical side plate (582) is connected with the rear end of the horizontal bottom plate (581), the vertical side plate (582) penetrates through the traction rod (52) and extends out of the top of the traction rod (52), the clamp (57) is arranged at the top of the traction rod (52), the clamp (57) comprises a push rod (571) and a rotating handle (572), the push rod (571) is horizontally arranged, the front end of the push rod (52) is connected with the front end of the vertical side plate (571), and the lower end of the rotating handle (582) is hinged to the lower end of the traction rod (582).

2. The co-track towing trailer according to claim 1, wherein the front wheel assembly (2) comprises a front wheel fixing seat (21) rotatably arranged at the front side of the bottom of the vehicle body (1) and front directional wheels (22) arranged at two ends of the front wheel fixing seat (21), and a front mounting plate (25) used for connecting the connecting rod assembly (4) and a mounting frame (26) used for connecting the towing rod assembly (5) are arranged on the front wheel fixing seat (21).

3. The co-track tractor trailer according to claim 1, wherein the rear wheel assembly (3) comprises a rear wheel fixing seat (31) rotatably arranged at the rear side of the bottom of the vehicle body (1) and rear directional wheels (32) arranged at two ends of the rear wheel fixing seat (31), and a rear mounting plate (35) for connecting the connecting rod assembly (4) is arranged on the rear wheel fixing seat (31).

4. Co-track tractor trailer according to claim 1, characterised in that the length of the tie rod assembly (4) is adjustable.

5. The co-track trailer according to claim 1, wherein the drawbar assembly (5) comprises a mounting seat (51) for connecting the front wheel assembly (2), a drawbar (52) having one end hinged to the mounting seat (51), a connecting member (53) arranged at the other end of the drawbar (52), and a handle (54) arranged on the drawbar (52) with an adjustable mounting angle.

6. Co-track tractor trailer according to claim 1, characterised in that the rear end of the body (1) is provided with a tail hook (6).

7. The co-track tractor trailer according to claim 1, wherein a connecting shaft (731) is arranged at the top of the auxiliary wheel fixing seat (71), a linear bearing (732) is arranged on the trailer body (1), and the connecting shaft (731) is in fit connection with the linear bearing (732).

8. The co-track trailer according to claim 1, wherein a guide post (741), a pressing plate (742) and a spring (743) are disposed on a top of the auxiliary wheel holder (71), the guide post (741) can movably pass through the vehicle body (1), the pressing plate (742) is disposed on a top end of the guide post (741), and the spring (743) is sleeved on the guide post (741) and presses between the pressing plate (742) and the vehicle body (1).