Semi-trailer traction device

Abstract

The present invention provides a semitrailer traction device, which relates to the technical field of traction equipment, and comprises a positioning column arranged at the center line of the semitrailer, a connecting assembly with one end rotatably connected to the positioning column, and a traction mechanism connected to the other end of the connecting assembly, wherein the traction mechanism is circumferentially slidably connected to the semitrailer with the positioning column as the central axis, and the traction mechanism is close to the end of the semitrailer connected to the tractor, and the traction mechanism comprises a traction pin and a lifting assembly for driving the traction pin to move vertically; and also comprises a limiting mechanism for limiting the traction mechanism at the center line of the semitrailer. The present invention has the effect of improving the problem in the prior art that semitrailers and tractors of different models cannot be used in coordination.

Description

Technical Field

[0001] The present invention relates to the technical field of traction equipment, and in particular to a traction device for a semitrailer. Background Art

[0002] Trailers are one of the common ways to transport goods over long distances and in large quantities. Semi-trailers, as a type of trailer, are used in conjunction with tractors through the cooperation of traction devices. Usually, the traction device includes a traction pin at the front end of the semi-trailer and a traction seat fixed to the rear end of the tractor. When in use, the tractor moves backward so that the traction pin is hung on the traction seat. When the tractor moves backward and inserts into the V-shaped opening of the traction seat, it is necessary to try to keep the center lines of the tractor and the semi-trailer consistent, and the center line offset of the two vehicles is limited to less than 40mm. The angle between the two center lines is limited to less than 5° when fully loaded and less than 7° when unloaded.

[0003] In the prior art, the height of a tractor is generally between 1300mm and 1400mm, but there are obvious differences in the heights of tractors from different manufacturers and models, which means that the tractor can only be used in conjunction with a semi-trailer within the corresponding height range. Tractors and semi-trailers of different models cannot be used in coordination, and their scope of use is limited, which hinders economic development. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a semitrailer towing device, which can improve the problem in the prior art that semitrailers and tractors of different models cannot be used in coordination.

[0005] According to an embodiment of the present invention, a semi-trailer traction device includes a positioning column arranged at the center line of the semi-trailer, a connecting component with one end rotatably connected to the positioning column, and a traction mechanism connected to the other end of the connecting component. The traction mechanism is circumferentially slidably connected to the semi-trailer with the positioning column as the central axis, and the traction mechanism is close to the end where the semi-trailer is connected to the tractor. The traction mechanism includes a traction pin and a lifting component for driving the traction pin to move vertically; and also includes a limiting mechanism for limiting the traction mechanism at the center line of the semi-trailer.

[0006] By adopting the above technical solution, before connecting the tractor to the semi-trailer, the limit of the traction mechanism by the limit mechanism is first cancelled, and then the traction pin is vertically moved to a height that can be connected to the traction seat through the lifting assembly, and then the tractor is connected to the semi-trailer; during the connection process, when the center lines of the tractor and the semi-trailer deviate and the traction pin contacts the V-shaped opening of the traction seat of the tractor, under the guiding action and reaction force of the V-shaped opening, the traction mechanism slides adaptively on the semi-trailer with the positioning column as the central axis to ensure that the traction pin is smoothly connected to the tractor, reducing the need for multiple driving and adjustment operations of the tractor, and relatively improving the traction efficiency; When the traction is completed and the semi-trailer is driven by the tractor, the traction force of the tractor causes the traction mechanism to slide in the opposite direction and return to the center line of the semi-trailer. At this time, the limiting mechanism forms a connection with the traction mechanism and limits the traction mechanism to the center line of the semi-trailer to ensure the good connection effect of the traction pin on the tractor and the semi-trailer, and prevents the center lines of the two from shifting during driving; during the traction process, the lifting assembly allows the traction pin to move in the vertical direction within its installation range, so as to increase the collaborative operation range of the semi-trailer and the tractor, and improve the problem in the prior art that semi-trailers and tractors of different models cannot be used collaboratively.

[0007] Preferably, the lifting assembly includes a sleeve slidably connected to the semi-trailer with a positioning column as the central axis, a lifting cylinder threadedly connected to the sleeve, and a driving member for driving the lifting cylinder to rotate. The sleeve is an upper and lower opening structure and is formed with an internal thread. One end of the lifting cylinder is formed with an external thread and is threadedly connected to the sleeve, and the other end extends downward from the sleeve and is connected to the traction pin; the limiting mechanism is used to limit the sliding of the sleeve.

[0008] By adopting the above technical solution, when the traction pin is moved vertically by using the lifting assembly, the lifting cylinder is driven to rotate by the driving member, and the lifting cylinder moves vertically during the rotation process, driving the traction pin to move vertically, thereby completing the stepless adjustment of the traction pin in the vertical direction, thereby improving the problem in the prior art that semi-trailers and tractors of different models cannot be used in coordination.

[0009] Preferably, the driving member includes a cover plate detachably connected to the opening on the sleeve, a spline shaft coaxially connected to the lifting cylinder at one end and rotatably connected to the cover plate, a driven bevel gear key-connected to the other end of the spline shaft, a driving bevel gear meshing with the driven bevel gear, a plurality of rotating seats fixed on the cover plate, and a driving shaft, wherein the driving shaft is rotatably connected to the rotating seat and has one end coaxially fixed to the driving bevel gear, and the other end extends horizontally out of the semi-trailer in a direction perpendicular to the center line of the semi-trailer.

[0010] By adopting the above technical solution, when the lifting cylinder is driven to rotate by the driving member, the driving shaft is rotated by applying force to the other end of the driving shaft, thereby driving the active bevel gear to rotate, causing the driven bevel gear and the spline shaft to rotate in turn, thereby driving the lifting cylinder to rotate, and driving the lifting cylinder and the traction pin to perform vertical lifting.

[0011] Preferably, the driving shaft includes a sleeve shaft having one end coaxially fixed to the active bevel gear and rotatably connected to the rotating seat, and an insertion shaft inserted at the other end of the sleeve shaft, a polygonal hole is opened at the other end of the sleeve shaft, and one end of the insertion shaft is adapted and inserted in the polygonal hole of the sleeve shaft.

[0012] By adopting the above technical solution, when the driving bevel gear needs to be driven to rotate by the driving shaft, the end of the plug shaft with a polygonal cross-section is inserted into the polygonal hole of the sleeve shaft, and the sleeve shaft can be rotated by applying force to the plug shaft, thereby driving the driving bevel gear to rotate. That is, during driving, the plug shaft can be removed to reduce the possibility of the driving shaft breaking.

[0013] Preferably, a limiting hole is provided on the side wall of the sleeve, and two inclined surfaces are provided on one side of the limiting hole, and the two inclined surfaces are respectively connected to the two sides of the sleeve in the horizontal direction; the limiting mechanism includes a limiting rod slidably connected to the semi-trailer and an elastic member for driving one end of the limiting rod to insert into the limiting hole, the limiting rod is provided with a slot, and the slot is provided with a retraction surface facing the limiting rod close to one end of the sleeve, the semi-trailer is provided with a socket for the insertion of the plug shaft and abutting against the retraction surface, and the plug shaft is threadedly connected to the hole wall of the socket.

[0014] By adopting the above technical solution, after the height of the traction pin is adjusted by the lifting assembly and before the tractor is connected to the semi-trailer, the plug shaft is first removed from the sleeve shaft and inserted into the socket, so that the plug shaft is gradually rotated into the semi-trailer and abuts against the retraction surface. As the plug shaft is rotated in, under the guidance of the retraction surface, the elastic member is compressed, and the limit rod slides and slides out of the limit hole, thereby canceling the limit of the traction mechanism by the limit mechanism; after the docking is completed, the plug shaft is rotated in the opposite direction so that the plug shaft is disengaged from the slot, so that the limit rod can be extended to the sleeve under the action of the elastic member returning to the natural state; when the semi-trailer is towed by the tractor and the center planes of the semi-trailer and the tractor return to the same plane, the end of the limit rod extending to the sleeve contacts the inclined surface and retracts until the limit rod is inserted into the limit rod, thereby forming a limit to the sleeve; the plug shaft can drive the sleeve shaft to rotate, and can also drive the limit rod to slide, so it has two uses, and during driving, the plug shaft can be inserted into the socket, which not only forms a sealing effect on the socket, but also facilitates the placement of the plug shaft.

[0015] Preferably, the connecting assembly comprises two collars respectively sleeved and rotatably connected to the positioning column and the lifting assembly and a connecting rod simultaneously connected to the collars, and the connecting rod is circumferentially slidably connected to the semi-trailer with the positioning column as the central axis.

[0016] By adopting the above technical solution, when the traction mechanism slides on the semi-trailer, it drives one of the rings to slide, and the connecting rod slides adaptively in a fan-shaped trajectory with the positioning column as the central axis in the semi-trailer; when the semi-trailer is towed by the tractor, under the action of the connecting rod, the traction mechanism slides toward the center line of the semi-trailer until the limiting mechanism extends and limits the sliding of the limiting mechanism.

[0017] Preferably, the upper side of the semi-trailer is provided with a mounting hole for installing a positioning column, an arc-shaped groove for sliding a traction mechanism, a fan-shaped groove for installing a connecting assembly, and a mounting groove for installing a limiting mechanism. The lower opening radius difference of the arc-shaped groove is smaller than the upper opening radius difference. The fan-shaped groove connects the mounting hole and the arc-shaped groove, and the mounting hole, the arc-shaped groove and the fan-shaped groove are simultaneously covered with a top cover, the top cover is provided with an arc-shaped opening, the fan-shaped groove and the mounting groove are connected up and down, and the connection point is covered with a cover for closing the mounting groove, and the mounting groove is arranged at the center line of the semi-trailer and connected to the arc-shaped groove.

[0018] By adopting the above technical solution, during installation, first install the limit mechanism in the installation groove and cover it, then install the positioning column in the installation hole, install the traction mechanism in the arc groove, and finally cover the top cover.

[0019] Preferably, the diameter of the lower opening of the sleeve is smaller than the diameter of the upper opening, the diameter of the upper end of the lifting cylinder is larger than the diameter of the lower end, and the upper end of the lifting cylinder is threadedly connected to the upper opening end of the sleeve.

[0020] By adopting the above technical solution, since the lower opening diameter of the sleeve is smaller than the upper opening diameter, the upper end of the lifting cylinder is threadedly connected to the upper opening end of the sleeve, so that the lower end of the sleeve forms a limit effect on the downward sliding of the lifting cylinder to prevent the lifting cylinder from directly sliding downward.

[0021] Preferably, a guide ring is provided at one end of the sleeve shaft for inserting the plug shaft, the diameter of the guide ring is larger than the diameter of the sleeve shaft, and the guide ring opens toward the plug shaft, and the opening is a bell mouth.

[0022] By adopting the above technical solution, when the insertion shaft is inserted into the polygonal hole of the sleeve shaft, the guide ring can guide the insertion of the insertion shaft to facilitate the insertion of the insertion shaft.

[0023] Preferably, the opening of the jack is a bell mouth.

[0024] By adopting the above technical solution, it is convenient to insert the insertion shaft into the insertion hole.

[0025] In summary, the present invention includes at least one of the following beneficial technical effects:

[0026] 1. A lifting cylinder is provided to install the traction pin, a sleeve is provided to be threadedly connected to the lifting cylinder, and a driving member connected to the lifting cylinder is provided to drive the lifting cylinder to rotate through the driving member, so that the lifting cylinder moves vertically while rotating, so as to adjust the traction pin to a height suitable for the tractor, thereby improving the problem in the prior art that different models of semi-trailers and tractors cannot be used in coordination;

[0027] 2. The traction mechanism is slidably arranged in the arc groove, and a positioning column is arranged at the center line of the semi-trailer. The traction mechanism and the positioning column are connected by a connecting assembly, so that the traction mechanism can slide at a certain angle in the arc groove with the positioning column as the central axis, so that when the tractor and the semi-trailer are connected, the traction mechanism can slide adaptively, and the connection between the tractor and the semi-trailer can be completed relatively quickly, reducing the number of times the position of the semi-trailer needs to be adjusted, and relatively improving the traction efficiency;

[0028] 3. By setting a limit rod and an elastic part, the limit rod can form a limiting effect on the sleeve after it returns to the center line of the semi-trailer, preventing the center line of the tractor and the semi-trailer from shifting when the tractor is towing the semi-trailer, thereby ensuring the long-term effectiveness of traction and the safety of driving; the plug shaft can be connected to the sleeve shaft, and can also drive and limit the sliding of the limit rod. It has multiple uses, is more practical, and has a relatively better use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of a partial explosion structure of an embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of a partial cross-sectional structure of an embodiment of the present invention;

[0032] Figure 4 yes Figure 3 The enlarged structural diagram of the middle A part mainly shows the traction mechanism;

[0033] Figure 5 yes Figure 3 The enlarged structural diagram of part B in the middle mainly shows the limiting mechanism.

[0034] In the above drawings: 1, semi-trailer; 11, mounting hole; 12, arc groove; 121, top cover; 13, fan-shaped groove; 14, mounting groove; 141, cover; 15, socket; 2, positioning column; 3, connecting assembly; 31, collar; 32, connecting rod; 4, traction pin; 5, lifting assembly; 51, sleeve; 511, limiting hole; 512, inclined surface; 52, lifting cylinder; 53, driving member; 531, cover plate; 532, spline shaft; 533, driven bevel gear; 534, driving bevel gear; 535, rotating seat; 536, driving shaft; 5361, sleeve shaft; 53611, guide ring; 5362, plug shaft; 6, limiting rod; 61, slot; 611, retracting surface; 7, elastic member. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-5 The present invention is further described.

[0036] Reference Figures 1 to 3 The embodiment of the present invention provides a semitrailer traction device, including a positioning column 2, a connecting assembly 3, a traction mechanism and a limiting mechanism; the positioning column 2 is installed at the center line of the semitrailer 1. The traction mechanism includes a traction pin 4 and a lifting assembly 5 for driving the traction pin 4 to move vertically, so that the semitrailer 1 and the tractor are connected through the traction pin 4, and the vertical movement of the traction pin 4 is achieved through the lifting action of the lifting assembly 5, thereby improving the problem in the prior art that semitrailers and tractors of different models cannot be used in coordination.

[0037] The traction mechanism is connected to the semitrailer 1 by sliding around the positioning column 2 as the central axis, and the traction mechanism is close to the end of the semitrailer 1 connected to the tractor relative to the positioning column 2, and the connecting assembly is simultaneously rotated and connected to the positioning column 2 and the traction mechanism; that is, when the tractor is towing the semitrailer 1, and the center lines of the tractor and the semitrailer 1 do not coincide, the traction pin 4 contacts the V-shaped opening of the traction seat of the tractor, and under the guidance of the V-shaped opening, the traction mechanism slides adaptively on the semitrailer 1 to ensure that the traction pin 4 is connected to the tractor smoothly, reducing the number of times the tractor needs to adjust its position repeatedly, thereby improving the traction efficiency. After the traction is completed, when the semitrailer 1 is towed by the tractor, the traction mechanism slides in the opposite direction with the positioning column 2 as the central axis and returns to the central axis of the semitrailer 1.

[0038] The limiting end of the limiting mechanism is arranged at the center line of the semitrailer 1 to limit the traction mechanism that slides in the opposite direction and is located at the center line of the semitrailer 1, so as to prevent the center lines of the semitrailer 1 and the tractor from deviating when the tractor is towing the semitrailer 1, thereby ensuring the safety of driving.

[0039] Reference Figure 1 and Figure 2In order to install the positioning column 2, the connecting assembly 3, the traction mechanism and the limiting mechanism, a mounting hole 11, an arc groove 12, a fan-shaped groove 13 and a mounting groove 14 are opened on the upper side of the semi-trailer 1.

[0040] Specifically, the mounting hole 11 is provided at the center line of the semitrailer 1 for the insertion of the positioning column 2 .

[0041] The arc groove 12 is located at one end of the semitrailer 1 connected to the tractor relative to the mounting hole 11, and takes the mounting hole 11 as the center of the circle to complete the installation of the traction mechanism; the arc groove 12 vertically penetrates the semitrailer 1, and the lower opening radius difference of the arc groove 12 is smaller than the upper opening radius difference, that is, a step is formed at the lower opening of the arc groove 12.

[0042] The fan-shaped groove 13 takes the mounting hole 11 as the center of the circle and is connected to the mounting hole 11 and the arc-shaped groove 12 at the same time, so as to install the connecting component 3. The connected mounting hole 11, the arc-shaped groove 12 and the fan-shaped groove 13 are covered with a top cover 121 at the same time to relatively close the upper openings of the three; the top cover 121 is also provided with an arc-shaped opening connected to the arc-shaped groove 12.

[0043] The mounting groove 14 is opened at the center line of the semi-trailer 1 and is connected to the arc groove 12 to install the limiting mechanism, and the limiting end of the limiting mechanism extends out of the mounting groove 14 to limit the traction mechanism at the center line of the semi-trailer 1. The mounting groove 14 is arranged at the lower side of the fan-shaped groove 13, and the fan-shaped groove 13 and the mounting groove 14 are connected up and down, and the connection is covered with a cover 141 to close the connection to ensure that the limiting mechanism limits the traction mechanism smoothly.

[0044] A socket 15 connected to the mounting groove 14 is also provided on the side wall of the semitrailer 1. The socket 15 is a round hole formed with an internal thread. The opening of the socket 15 connected to the side wall of the semitrailer 1 is a bell mouth to form a guide to facilitate the insertion of objects.

[0045] Reference Figures 3 to 5 The connecting assembly 3 includes two collars 31 and a connecting rod 32. The two collars 31 are rotatably connected to the positioning column 2 and the lifting assembly 5, respectively. The connecting rod 32 is slidably connected in the fan-shaped groove 13, and its two ends are respectively connected to the two collars 31. When installing, after removing the top cover 121, the two collars 31 are respectively sleeved on the positioning column 2 and the lifting assembly 5. When the traction mechanism slides in the arc groove 12, the connecting rod 32 rotates with the positioning column 2 as the central axis.

[0046] The lifting assembly 5 includes a sleeve 51 formed with an internal thread, a lifting cylinder 52 threadedly connected to the sleeve 51 , and a driving member 53 for driving the lifting cylinder 52 to rotate.

[0047] The sleeve 51 abuts against the step of the arc groove 12, and the outer side is an arc surface abutting against the inner wall of the arc groove 12; the sleeve 51 penetrates the opening to form an upper and lower opening structure, and the inner wall of the upper opening is formed with an internal thread, and the diameter of the upper opening is larger than the diameter of the lower opening, thereby forming a step. A limiting hole 511 is provided on the side of the sleeve 51 close to the installation groove 14, and the limiting hole 511 is connected to the installation groove 14; two inclined surfaces 512 are provided on one side of the sleeve 51 where the limiting hole 511 is provided, and the two inclined surfaces 512 are respectively connected to the two sides of the sleeve 51 in the horizontal direction; an annular groove is also provided on the outer side of the sleeve 51 to facilitate the installation of the collar 31.

[0048] The lifting cylinder 52 is an internal hollow structure, with an external thread formed on its upper end to form a threaded connection structure with the sleeve 51, and the lower end extends downward from the lower opening of the sleeve 51 to be connected to the traction pin 4; the diameter of the upper end of the lifting cylinder 52 is larger than the diameter of the lower end, so that the steps of the sleeve 51 and the lifting cylinder 52 abut against each other, which can prevent the lifting cylinder 52 from slipping out of the sleeve 51.

[0049] The driving member 53 includes a cover plate 531, a spline shaft 532, a driven bevel gear 533, a driving bevel gear 534, a plurality of rotating seats 535 and a driving shaft 536; the cover plate 531 is detachably connected to the upper opening of the sleeve 51; a plurality of keyways are arranged on the outer side of the spline shaft 532, the lower end of which is coaxially connected to the lifting cylinder 52 and rotatably connected to the cover plate 531, and the upper end of the spline shaft 532 can extend out of the cover plate 531 and extend out of the arc-shaped opening of the top cover 121. The driven bevel gear 533 is key-connected to one end of the spline shaft 532 extending out of the cover plate 531 and meshes with the driving bevel gear 534; a plurality of rotating seats 535 are fixed to the cover plate 531; the driving shaft 536 is rotatably connected to the rotating seat 535, one end of which is coaxially fixed to the driving bevel gear 534, and the other end of which extends horizontally out of the semitrailer 1 in a direction perpendicular to the center line of the semitrailer 1.

[0050] When the traction pin 4 is raised or lowered, the driving shaft 536 is rotated to drive the active bevel gear 534 to rotate, and then indirectly drives the driven bevel gear 533 and the spline shaft 532 to rotate, so that the lifting cylinder 52 rotates and is lifted or lowered vertically in the sleeve 51, thereby driving the traction pin 4 to achieve vertical movement, thereby improving the problem in the prior art that different models of semi-trailers 1 and tractors cannot be used in coordination. During installation, the lifting range of the traction pin 4 can be designed to be 1300mm-1400mm to adapt to different models of semi-trailers 1 and tractors as much as possible; of course, other range values ​​can also be used.

[0051] The drive shaft 536 includes a sleeve shaft 5361 and an insertion shaft 5362; one end of the sleeve shaft 5361 is coaxially fixed to the driving bevel gear 534 and rotatably connected to the rotating seat 535, and the other end is provided with a polygonal hole (non-circular hole). The cross section of one end of the insertion shaft 5362 is polygonal, so as to fit and be inserted into the polygonal hole of the sleeve shaft 5361, and the other end is formed with an external thread and can be threadedly connected to the hole wall of the insertion hole 15. The drive shaft 536 is disassembled into two to prevent breakage due to the excessive length of its suspended end. At the same time, after it is damaged, the number of replacement parts is relatively reduced, thereby reducing costs.

[0052] A guide ring 53611 is fixed to one end of the sleeve shaft 5361 having a polygonal hole. The diameter of the guide ring 53611 is larger than the diameter of the sleeve shaft 5361 and is opened toward the insertion shaft 5362. The opening is a bell-shaped opening to facilitate the insertion of the insertion shaft 5362 and relatively improve efficiency.

[0053] The limiting mechanism includes a limiting rod 6 and an elastic member 7; the limiting rod 6 is T-shaped and slidably connected to the mounting groove 14, one end of which can slide out of the mounting groove 14 and extend into the limiting hole 511 to form a limiting effect on the sleeve 51; a slot 61 is provided on the outer side of the limiting rod 6, and the slot 61 is provided with a retracting surface 611 facing one end of the limiting rod 6 close to the sleeve 51, the elastic member 7 is a spring, and its two ends are respectively fixed to the limiting rod 6 and the groove wall of the mounting groove 14, and when the elastic member 7 is in a natural state, the limiting rod 6 extends out of the mounting groove 14 and extends into the limiting hole 511, the slot 61 is connected to the socket 15, and the upper end of the inclined retracting surface 611 is close to the socket 15.

[0054] When connecting the tractor and the semi-trailer 1, first insert the plug shaft 5362 into the sleeve shaft 5361 and rotate it to indirectly drive the lifting cylinder 52 to rotate and move vertically, and drive the traction pin 4 to move vertically, so as to complete the change of the height of the traction pin 4 to adapt to different types of tractors; then insert the plug shaft 5362 into the socket 15, so that the plug shaft 5362 continues to enter and abuts against the retracting surface 611, the elastic member 7 is compressed, and the limit rod 6 is recovered in the installation groove 14, and the limit rod 6 is separated from the sleeve 51; then connect the tractor and the semi-trailer 1. During the connection process, the traction pin 4 contacts the V-shaped mouth of the traction seat of the tractor, and the V-shaped mouth wall guides the traction mechanism and makes the lifting assembly 5 slide in the arc groove 12 to ensure that the traction pin 4 is smoothly connected to the tractor, reducing the number of times the tractor needs to be repeatedly adjusted; after the connection is completed, the plug shaft 5362 is rotated in the opposite direction to make the plug shaft 5362 disengage from the slot 61 (the plug shaft 5362 is placed in the socket 15 for next use), at this time, the limit rod 6 extends out of the installation slot 14 and extends into the arc groove 12 under the action of the elastic member 7; then, the tractor is started, and the semi-trailer 1 is driven by the tractor. Under the action of the traction force and the positioning column 2, the lifting assembly 5 slides in the opposite direction in the arc groove 12, and after the limit rod 6 touches the inclined surface 512 and is recovered, as the lifting assembly 5 continues to slide and enters the limit hole 511, the limit rod 6 forms a limit on the lifting assembly 5 to prevent the lifting assembly 5 from sliding during the driving of the vehicle.

[0055] It should be noted that the top cover 121, the cover 141, the traction pin 4, the cover plate 531, and the spline shaft 532 are all installed by countersunk screws to prevent the protrusion of the screw head from hindering the operation of other parts.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A semitrailer traction device, characterized in that: The invention comprises a positioning column (2) arranged at the center line of a semitrailer (1), a connecting assembly (3) having one end rotatably connected to the positioning column (2), and a traction mechanism connected to the other end of the connecting assembly (3); the traction mechanism is slidably connected to the semitrailer (1) with the positioning column (2) as the center axis, and the traction mechanism is close to the end of the semitrailer (1) connected to the tractor; the traction mechanism comprises a traction pin (4) and a lifting assembly (5) for driving the traction pin (4) to move vertically; and also comprises a limiting mechanism for limiting the traction mechanism at the center line of the semitrailer (1); The lifting assembly (5) comprises a sleeve (51) slidably connected to the semi-trailer (1) with the positioning column (2) as the central axis, a lifting cylinder (52) threadedly connected to the sleeve (51), and a driving member (53) for driving the lifting cylinder (52) to rotate, wherein the sleeve (51) is an upper and lower opening structure and is formed with an internal thread, one end of the lifting cylinder (52) is formed with an external thread and is threadedly connected to the sleeve (51), and the other end extends downward from the sleeve (51) and is connected to the traction pin (4); the limiting mechanism is used to limit the sliding of the sleeve (51); The driving member (53) comprises a cover plate (531) detachably connected to the opening of the sleeve (51), a spline shaft (532) one end of which is coaxially connected to the lifting cylinder (52) and rotatably connected to the cover plate (531), a driven bevel gear (533) key-connected to the other end of the spline shaft (532), a driving bevel gear (534) meshed with the driven bevel gear (533), a plurality of rotating seats (535) fixed on the cover plate (531), and a driving shaft (536); the driving shaft (536) is rotatably connected to the rotating seat (535) and one end of which is coaxially fixed to the driving bevel gear (534), and the other end of which horizontally extends out of the semitrailer (1) in a direction perpendicular to the center line of the semitrailer (1); The connecting assembly (3) comprises two sleeves (31) respectively sleeved and rotatably connected to the positioning column (2) and the lifting assembly (5), and a connecting rod (32) simultaneously connected to the sleeves (31); the connecting rod (32) is circumferentially slidably connected to the semitrailer (1) with the positioning column (2) as the central axis; The upper side of the semitrailer (1) is provided with a mounting hole (11) for mounting a positioning column (2), an arc-shaped groove (12) for sliding a traction mechanism, a fan-shaped groove (13) for mounting a connecting assembly (3), and a mounting groove (14) for mounting a limiting mechanism. The lower opening radius difference of the arc-shaped groove (12) is smaller than the upper opening radius difference. The fan-shaped groove (13) is connected to the mounting hole (11) and the arc-shaped groove (12). The mounting hole (11), the arc-shaped groove (12), and the fan-shaped groove (13) are simultaneously covered with a top cover (121). The top cover (121) is provided with an arc-shaped opening. The fan-shaped groove (13) and the mounting groove (14) are connected up and down, and a cover (141) for closing the mounting groove (14) is provided at the connection point. The mounting groove (14) is arranged at the center line of the semitrailer and is connected to the arc-shaped groove (12).

2. A semitrailer traction device according to claim 1, characterized in that: The driving shaft (536) includes a sleeve shaft (5361) having one end coaxially fixed to the active bevel gear (534) and rotatably connected to the rotating seat (535), and an insertion shaft (5362) inserted into the other end of the sleeve shaft (5361), wherein a polygonal hole is formed at the other end of the sleeve shaft (5361), and one end of the insertion shaft (5362) is adapted to and inserted into the polygonal hole of the sleeve shaft (5361).

3. A semitrailer traction device according to claim 2, characterized in that: The side wall of the sleeve (51) is provided with a limiting hole (511), and two inclined surfaces (512) are provided on one side of the sleeve (51) where the limiting hole (511) is provided, and the two inclined surfaces (512) are respectively connected to the two sides of the sleeve (51) in the horizontal direction; the limiting mechanism comprises a limiting rod (6) slidably connected to the semi-trailer (1) and an elastic member (7) for driving one end of the limiting rod (6) to insert into the limiting hole (511), the limiting rod (6) is provided with a slot (61), and the slot (61) is provided with a retracting surface (611) facing the limiting rod (6) and close to one end of the sleeve (51), the semi-trailer (1) is provided with an insertion hole (15) for the insertion shaft (5362) to be inserted and abut against the retracting surface (611), and the insertion shaft (5362) is threadedly connected to the hole wall of the insertion hole (15).

4. A semitrailer traction device according to claim 1, characterized in that: The diameter of the lower opening of the sleeve (51) is smaller than the diameter of the upper opening, the diameter of the upper end of the lifting cylinder (52) is larger than the diameter of the lower end, and the upper end of the lifting cylinder (52) is threadedly connected to the upper opening end of the sleeve (51).

5. A semitrailer traction device according to claim 2, characterized in that: A guide ring (53611) is provided at one end of the sleeve shaft (5361) for inserting the insertion shaft (5362), the diameter of the guide ring (53611) is larger than the diameter of the sleeve shaft (5361), and the guide ring (53611) opens toward the insertion shaft (5362), and the opening is a bell mouth.

6. A semitrailer traction device according to claim 3, characterized in that: The opening of the jack (15) is a bell mouth.

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