Tractor trailer device and tractor

Abstract

The present application relates to a kind of tractor towed device and tractor, tractor towed device includes towed support, height adjusting mechanism and towed hook, the towed side of towed support is equipped with first guide rail and second guide rail, first guide rail is equipped with first positioning hole, and second guide rail is equipped with second positioning hole;Height adjusting mechanism includes mounting plate, first elastic pin, second elastic pin and telescopic drive part, the both ends of mounting plate are slidably connected with first guide rail and second guide rail, and towed hook and telescopic drive part are respectively installed in the middle of mounting plate, first telescopic hole and second telescopic hole are opened in mounting plate, first elastic pin and second elastic pin are respectively elastically connected in corresponding telescopic hole, and telescopic drive part is respectively connected and drives first elastic pin and second elastic pin to extend or retract from first telescopic hole and second telescopic hole;Wherein, first elastic pin and second elastic pin extend from first telescopic hole and second telescopic hole, and can be respectively inserted in corresponding positioning hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tractor, in particular to a tractor towing device and tractor. BACKGROUND

[0002] The existing tractor towing device cannot adjust the towing height, and the flexibility of the towing device is poor, which consumes a lot of manpower and is not suitable for operation. SUMMARY

[0003] The present application relates to the field of tractor, in particular to a tractor towing device and tractor.

[0004] The technical scheme for solving the above technical problems is as follows: a tractor towing device, comprising a towing bracket, a height adjusting mechanism and a towing hook, the towing bracket comprising a towing side and a connecting side;

[0005] The towing side of the towing bracket is provided with a first guide rail and a second guide rail, the first guide rail is provided with a first positioning hole, and the second guide rail is provided with a second positioning hole;

[0006] The height adjusting mechanism comprises a mounting plate, a first elastic pin, a second elastic pin and a telescopic driving part, the two ends of the mounting plate are respectively connected with the first guide rail and the second guide rail, the towing hook and the telescopic driving part are respectively installed in the middle part of the mounting plate, the mounting plate is provided with a first telescopic hole and a second telescopic hole, the first elastic pin and the second elastic pin are respectively elastically connected in the first telescopic hole and the second telescopic hole of the mounting plate, and the telescopic driving part is connected with and drives the first elastic pin and the second elastic pin to extend out of or retract into the first telescopic hole and the second telescopic hole respectively;

[0007] When the first elastic pin and the second elastic pin extend out of the first telescopic hole and the second telescopic hole, they can be respectively inserted into the corresponding first positioning hole and second positioning hole.

[0008] The tractor towing device of the present application can drive the first elastic pin and the second elastic pin to extend and retract by using the telescopic driving part, and then can be inserted into the positioning holes of the two guide rails at different heights, so as to realize the quick adjustment of the hanging height and the quick hanging of the towing bracket, which is flexible, reliable, convenient and practical.

[0009] On the basis of the above technical scheme, the present application can also be improved as follows.

[0010] Further, the telescopic driving part comprises a driving ring and two pull rods, one end of each of the two pull rods is connected with the driving ring, and the two pull rods are arranged in 180° rotational symmetry with the center of the driving ring as the symmetry center.

[0011] The other ends of the two pull rods are connected with the first elastic pin and the second elastic pin respectively; the driving ring is provided with an arc-shaped hole, and the mounting plate is provided with a guide pin which is inserted into the arc-shaped hole.

[0012] The beneficial effect of the above further scheme is that the structure of the driving ring and the two pull rods can be rotated by pulling the driving ring, and then the two elastic pins are moved by the pull rods, so that the structure has good stability.

[0013] Further, the mounting plate is further provided with a first sliding hole and a second sliding hole, the first sliding hole is arranged along the axial direction of the first telescopic hole and communicates with the first telescopic hole, and the second sliding hole is arranged along the axial direction of the second telescopic hole and communicates with the second telescopic hole; the other ends of the two pull rods are hingedly connected with the first elastic pin and the second elastic pin through a first rotating shaft and a second rotating shaft respectively, and the first rotating shaft and the second rotating shaft are slidably inserted into the corresponding first sliding hole and second sliding hole respectively.

[0014] The beneficial effect of the above further scheme is that the first sliding hole and the second sliding hole are matched with the first rotating shaft and the second rotating shaft respectively, so that stable transmission between the pull rod and the elastic pin can be realized, and stable sliding of the elastic pin in the telescopic hole can be realized.

[0015] Further, the outer ring side of the driving ring is provided with two oppositely arranged hinged interfaces, and one end of each of the two pull rods is movably inserted into the two hinged interfaces.

[0016] The beneficial effect of the above further scheme is that the hinged interface and the pull rod are matched, so that the pull rod can be moved relative to the driving ring, which is conducive to the linear movement of the elastic pin.

[0017] Further, the driving ring is located outside the mounting plate, and a rotating handle is connected to the driving ring.

[0018] Further, the driving ring is provided with a limiting pin which is elastically connected to the driving ring and protrudes from one side surface of the driving ring; when the first elastic pin and the second elastic pin are extended from the first telescopic hole and the second telescopic hole, the limiting pin abuts against the circumferential edge of the mounting plate.

[0019] The beneficial effect of the above further scheme is that the limiting pin can be abutted and limited when the elastic pin is in the extended locking state, so as to further ensure the safety and reliability of the hanging.

[0020] Further, the circumferential edge of the driving ring is provided with a connecting plate, the limiting pin is elastically connected to the connecting plate, the other side of the connecting plate is fixed with a connecting base, the two sides of the connecting base in the axial direction are respectively provided with a first limiting groove and a second limiting groove, a return spring is arranged in the first limiting groove, one end of the return spring abuts against the groove bottom of the first limiting groove, and the other end of the return spring is connected to the limiting pin, a snap spring is arranged in the second limiting groove, and the limiting pin penetrates through the connecting plate, the first limiting groove and the second limiting groove, and one end of the limiting pin protrudes from one side of the connecting plate, and the other end of the limiting pin is located in the second limiting groove and is clamped with the snap spring.

[0021] Further, the first telescopic hole and the second telescopic hole are blind holes, the first telescopic hole and the second telescopic hole are coaxially arranged, the ends of the first telescopic hole and the second telescopic hole away from each other are open ends, the bottoms of the first telescopic hole and the second telescopic hole are respectively provided with a first spring and a second spring, and the first elastic pin and the second elastic pin are respectively connected with the first spring and the second spring.

[0022] Further, a connecting hole penetrating through the two sides of the middle part of the mounting plate is formed in the middle part of the mounting plate, a first pin hole is further formed in the mounting plate, the axis of the first pin hole is perpendicular to the axis of the connecting hole, one end of the first pin hole communicates with the connecting hole, the connecting column of the towing hook penetrates through the connecting hole and is locked to the middle part of the mounting plate through a locking nut, a second pin hole is formed in the connecting column, the axis of the second pin hole is perpendicular to the axis of the connecting column, the first pin hole and the second pin hole are coaxially and correspondingly arranged and are connected through a pin.

[0023] The beneficial effect of the above further scheme is that the connecting hole is arranged, which is conducive to the connection and fixation between the towing hook and the mounting plate.

[0024] A tractor comprises a tractor body and the tractor towing device, and the towing side of the towing bracket is mounted on the tractor body through fixing bolts.

[0025] The tractor of the present application can quickly adjust the height of the towing hook on the towing device, has good structural stability and high flexibility. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a front view of the main structure of the towing side of the tractor towing device of the present application;

[0027] Figure 2 FIG. 2 is a side view of the structure of the tractor towing device of the present application;

[0028] Figure 3Fig. 1 is a schematic view of the top structure of the tractor towing device of the present application;

[0029] Figure 4 Fig. 2 is a schematic view of the side structure of the towing hook of the present application;

[0030] Figure 5 Fig. 3 is a schematic view of the matching structure of the height adjusting mechanism of the present application;

[0031] Figure 6 Fig. 4 is a schematic view of the top structure of the height adjusting mechanism of the present application;

[0032] Figure 7 Fig. 5 is a schematic view of the front structure of the matching of the driving ring and the elastic pin of the present application; Figure 1

[0033] Fig. 6 is a schematic view of the side structure of the matching of the driving ring and the elastic pin of the present application; Figure 8 Figure 2 Fig. 7 is a schematic view of the three-dimensional structure of the matching of the driving ring and the elastic pin of the present application;

[0034] Figure 9 Fig. 8 is a schematic view of the partial cross-section of the side structure of the matching of the driving ring and the elastic pin of the present application;

[0035] Figure 10 Fig. 9 is a schematic view of the front structure of the mounting plate of the present application;

[0036] Figure 11 Figure 1 Fig. 10 is a schematic view of the front structure of the mounting plate of the present application;

[0037] Figure 12 Fig. 11 is a schematic view of the front structure of the mounting plate of the present application; Figure 2

[0038] Fig. 12 is a schematic view of the structure of the elastic pin in the extended locking state of the present application; Figure 13

[0039] Fig. 13 is a schematic view of the structure of the elastic pin in the moving retracted state of the present application. Figure 14 In the drawings, the components represented by the respective reference numerals are listed as follows:

[0040] 1, towing bracket; 11, first guide rail; 12, second guide rail; 13, first positioning hole; 14, second positioning hole; 15, cross plate; 16, fixed plate; 17, fixed bolt;

[0041]

[0042] ​​​2 height adjusting mechanism; 21 mounting plate; 22 first elastic pin; 23 second elastic pin; 24 first telescopic hole; 25 second telescopic hole; 26 driving ring; 27 pull rod; 271 first rotating shaft; 272 second rotating shaft; 28 arc-shaped hole; 29 guide pin; 290 first sliding hole; 291 second sliding hole; 292 connecting plate; 293 rotating handle; 294 limiting pin; 295 connecting base; 2950 return spring; 2951 clamping spring; 296 connecting hole; 297 first pin hole; 298 first spring; 299 second spring;

[0043] 3 towing hook; 31 connecting column; 32 locking nut; 33 pin. DETAILED DESCRIPTION

[0044] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are only used to explain the present application and not to limit the scope of the present application.

[0045] As shown in the drawings, Figures 1-14 A towing device for a tractor according to the present embodiment includes a towing bracket 1, a height adjusting mechanism 2, and a towing hook 3. The towing bracket 1 includes a towing side and a connecting side.

[0046] The towing side of the towing bracket 1 is provided with a first guide rail 11 and a second guide rail 12. The first guide rail 11 is provided with a first positioning hole 13, and the second guide rail 12 is provided with a second positioning hole 14.

[0047] The height adjusting mechanism 2 includes a mounting plate 21, a first elastic pin 22, a second elastic pin 23, and a telescopic driving part. The two ends of the mounting plate 21 are respectively connected with the first guide rail 11 and the second guide rail 12 in a sliding manner. The towing hook 3 and the telescopic driving part are respectively installed at the middle part of the mounting plate 21. The mounting plate 21 is provided with a first telescopic hole 24 and a second telescopic hole 25. The first elastic pin 22 and the second elastic pin 23 are respectively elastically connected in the first telescopic hole 24 and the second telescopic hole 25 of the mounting plate 21. The telescopic driving part is connected with and drives the first elastic pin 22 and the second elastic pin 23 to extend out of or retract into the first telescopic hole 24 and the second telescopic hole 25.

[0048] When the first elastic pin 22 and the second elastic pin 23 extend out of the first telescopic hole 24 and the second telescopic hole 25, they can be respectively inserted into the corresponding first positioning hole 13 and second positioning hole 14.

[0049] As shown in the drawings, Figures 1-3As shown, the specific structure of the trailer support 1 of the embodiment can include two fixed plates 16 and a plurality of cross plates 15, the two fixed plates 16 are arranged in parallel, the plurality of cross plates 15 are fixed between the two fixed plates 16 respectively, one end of the two fixed plates 16 forms the trailer side, and the other end of the two fixed plates 16 is connected with the first guide rail 11 and the second guide rail 12 respectively; the other end of the two fixed plates 16 forms the connecting side, and the other end of the two fixed plates 16 is bent to form a bent edge, and the two bent edges are connected with the fixed bolts 17 respectively. The lower end of the first guide rail 11 and the second guide rail 12 is further provided with a limiting screw, the limiting screw extends into the first guide rail 11 and the second guide rail 12, and is used for limiting the two ends of the mounting plate 21 from sliding out of the first guide rail 11 and the second guide rail 12.

[0050] As shown in the drawings, Figures 5-9 As shown, the telescopic driving part of the embodiment includes a driving ring 26 and two pull rods 27, one end of the two pull rods 27 is connected with the driving ring 26 respectively, and the two pull rods 27 are arranged in 180° rotational symmetry with the center of the driving ring 26 as the symmetry center; the other end of the two pull rods 27 is connected with the first elastic pin 22 and the second elastic pin 23 respectively; the driving ring 26 is provided with an arc-shaped hole 28, the mounting plate 21 is provided with a guide pin 29, and the guide pin 29 is inserted into the arc-shaped hole 28. The structure of the driving ring and the two pull rods can be rotated by pulling the driving ring, and then the two elastic pins are pulled to move, so that the structure is stable.

[0051] As shown in the drawings, Figure 5 , Figure 11 and Figure 12 As shown, the mounting plate 21 of the embodiment is further provided with a first sliding hole 290 and a second sliding hole 291, the first sliding hole 290 extends along the axial direction of the first telescopic hole 24 and communicates with the first telescopic hole 24, and the second sliding hole 291 extends along the axial direction of the second telescopic hole 25 and communicates with the second telescopic hole 25; the other end of the two pull rods 27 is hinged with the first elastic pin 22 and the second elastic pin 23 through a first rotating shaft 271 and a second rotating shaft 272 respectively, and the first rotating shaft 271 and the second rotating shaft 272 are slidably inserted into the corresponding first sliding hole 290 and the second sliding hole 291 respectively. The first sliding hole and the second sliding hole are matched with the first rotating shaft and the second rotating shaft respectively, so that stable transmission between the pull rod and the elastic pin can be realized, and stable sliding of the elastic pin in the telescopic hole can be realized.

[0052] As shown in the drawings, Figures 7-9As shown in the drawings, the outer ring side of the driving circular ring 26 of the embodiment is provided with two oppositely arranged hinged joints, and one end of each of the two pull rods 27 is movably inserted into the two hinged joints. The hinged joint and pull rod cooperation structure can realize the movement of the pull rod relative to the driving circular ring, which is conducive to the linear movement of the elastic pin.

[0053] As shown in the drawings, Figure 6 The driving circular ring 26 of the embodiment is located outside the mounting plate 21, and a rotating handle 293 is connected to the driving circular ring 26.

[0054] As shown in the drawings, Figure 9 and Figure 10 The driving circular ring 26 of the embodiment is provided with a limiting pin 294, which is elastically connected to the driving circular ring 26 and protrudes from one side of the driving circular ring 26. When the first elastic pin 22 and the second elastic pin 23 are extended from the first telescopic hole 24 and the second telescopic hole 25, the limiting pin 294 abuts against the circumferential edge of the mounting plate 21. The limiting pin can abut and limit when the elastic pin is in the extended locking state, further ensuring the safety and reliability of the hanging connection.

[0055] As shown in the drawings, Figures 5-9 The circumferential edge of the driving circular ring 26 of the embodiment is provided with a connecting plate 292, and the limiting pin 294 is elastically connected to the connecting plate 292. The other side of the connecting plate 292 is fixed with a connecting base 295, and the connecting base 295 is provided with a first limiting groove and a second limiting groove on the two sides in the axial direction. A return spring 2950 is arranged in the first limiting groove, one end of the return spring 2950 abuts against the groove bottom of the first limiting groove, and the other end of the return spring 2950 is connected to the limiting pin 294. A snap spring 2951 is arranged in the second limiting groove, and the limiting pin 294 penetrates the connecting plate 292, the first limiting groove and the second limiting groove. One end of the limiting pin 294 protrudes from one side of the connecting plate 292, and the other end of the limiting pin 294 is located in the second limiting groove and is connected to the snap spring 2951.

[0056] The connecting plate 292 can be fixedly connected to the driving circular ring 26 through a connecting piece, or can be integrally connected and fixed, so that the connecting plate 292 extends relative to the outer ring edge of the driving circular ring 26.

[0057] The first telescopic hole 24 and the second telescopic hole 25 of the embodiment are both blind holes, the first telescopic hole 24 and the second telescopic hole 25 are coaxially arranged, one end of the first telescopic hole 24 and the second telescopic hole 25 away from each other is an open end, the bottom of the first telescopic hole 24 and the second telescopic hole 25 is respectively provided with a first spring 298 and a second spring 299, the first elastic pin 22 and the second elastic pin 23 are respectively connected with the first spring 298 and the second spring 299.

[0058] As shown in Figure 4 , Figure 5 , Figure 11 and Figure 12 , the middle part of the mounting plate 21 is provided with a connecting hole 296 penetrating through the two side faces, the mounting plate 21 is further provided with a first pin hole 297, the axis of the first pin hole 297 is perpendicular to the axis of the connecting hole 296, one end of the first pin hole 297 communicates with the connecting hole 296; the connecting column 31 of the towing hook 3 penetrates through the connecting hole 296 and is locked in the middle part of the mounting plate 21 through a locking nut 32, the connecting column 31 is provided with a second pin hole, the axis of the second pin hole is perpendicular to the axis of the connecting column 31, the first pin hole and the second pin hole are coaxially arranged and connected through a pin 33. The arrangement of the connecting hole is conducive to the connection and fixation between the towing hook and the mounting plate.

[0059] The working principle of the tractor towing device of the embodiment is that when the height adjusting mechanism 2 of the tractor towing device is locked, the whole tractor towing device can be used to tow a trailer or other devices. At this time, the first elastic pin 22 is in the telescopic position under the action of the first spring 298, the first elastic pin 22 extends into the first positioning hole 13 of the first guide rail 11; the second elastic pin 23 is in the telescopic position under the action of the second spring 299, the second elastic pin 23 is in the second positioning hole 14 of the second guide rail 12. In this state, the telescopic driving part is firmly locked, the pin 33 is pulled out, the towing pin is pulled out, and the trailer and other working devices are extended into the U-shaped hook of the towing hook 3, so that the towing and traction can be realized. When towing, the traction force acts on the mounting plate through the first guide rail 11 and the second guide rail 12, the first elastic pin 22 and the second elastic pin 23 are not stressed, and only play a locking and positioning role, as shown in Figure 13 .

[0060] When the tractor towing device is in the fast hitching state and needs to change the towing position, the limit pin 294 is pressed down, and the rotating handle 293 is counterclockwise rotated, the rotating handle 293 is rotated to drive the two pull rods 27 to drive the first elastic pin 22 and the second elastic pin 23 respectively, so that the first spring 298 and the second spring 299 are compressed, at this time, the whole height adjusting mechanism 2 is in a free state, as shown in Figure 14As shown, the first elastic pin 22 and the second elastic pin 23 are in the extended state and locked in the first positioning hole 13 of the first guide rail 11 and the second positioning hole 14 of the second guide rail 12 under the action of the first spring 298 and the second spring 299 by releasing the rotating handle 293, so that the quick hitching of the towing device is realized.

[0061] The tractor towing device can drive the first elastic pin and the second elastic pin to extend and retract by the telescopic driving part, and then can be inserted into the positioning holes at different heights of the two guide rails, so that the quick adjustment of the hitching height and the quick hitching of the towing bracket are realized, which is flexible, reliable, convenient and practical.

[0062] The embodiment also provides a tractor, which comprises a tractor body and the tractor towing device.

[0063] The tractor can realize the quick adjustment of the height of the towing hook on the towing device, has good structural stability and high flexibility.

[0064] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0065] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A tractor-trailer device for a tractor, characterized in that, The trailer support, the height adjusting mechanism and the trailer hook are included, the trailer support includes a trailer side and a connecting side; The trailer side of the trailer support is provided with a first guide rail and a second guide rail, the first guide rail is provided with a first positioning hole, and the second guide rail is provided with a second positioning hole; The height adjusting mechanism includes a mounting plate, a first elastic pin, a second elastic pin and a telescopic driving part, both ends of the mounting plate are respectively connected with the first guide rail and the second guide rail in a sliding mode, the telescopic driving part and the trailer hook are respectively installed on the middle part of the mounting plate, the mounting plate is provided with a first telescopic hole and a second telescopic hole, the first elastic pin and the second elastic pin are respectively elastically connected in the first telescopic hole and the second telescopic hole of the mounting plate, and the telescopic driving part is connected with and drives the first elastic pin and the second elastic pin to respectively extend out of or retract into the first telescopic hole and the second telescopic hole; When the first elastic pin and the second elastic pin extend out of the first telescopic hole and the second telescopic hole, the first elastic pin and the second elastic pin can be respectively inserted into the corresponding first positioning hole and second positioning hole; The telescopic driving part includes a driving ring and two pull rods, one end of each of the two pull rods is connected with the driving ring, and the two pull rods are arranged in a 180° rotational symmetry mode with the center of the driving ring as the symmetry center; The other end of each of the two pull rods is connected with the first elastic pin and the second elastic pin, the driving ring is provided with an arc-shaped hole, the mounting plate is provided with a guide pin, and the guide pin is inserted into the arc-shaped hole; The mounting plate is also provided with a first sliding hole and a second sliding hole, the first sliding hole is arranged in an axial extension mode along the first telescopic hole and communicates with the first telescopic hole, the second sliding hole is arranged in an axial extension mode along the second telescopic hole and communicates with the second telescopic hole, and the other end of each of the two pull rods is hingedly connected with the first elastic pin and the second elastic pin through a first rotating shaft and a second rotating shaft, respectively. The first rotating shaft and the second rotating shaft are slidably inserted into the corresponding first sliding hole and second sliding hole, respectively; The driving ring is provided with a limiting pin, the limiting pin is elastically connected to the driving ring and protrudes from one side of the driving ring, and when the first elastic pin and the second elastic pin extend out of the first telescopic hole and the second telescopic hole, the limiting pin abuts against the circumferential edge of the mounting plate; The circumferential edge of the driving ring is provided with a connecting plate, the limiting pin is elastically connected to the connecting plate, the other side of the connecting plate is fixedly provided with a connecting base, the connecting base is provided with a first limiting groove and a second limiting groove on the two sides in the axial direction, the first limiting groove is provided with a return spring, one end of the return spring abuts against the groove bottom of the first limiting groove, and the other end of the return spring is connected to the limiting pin, the second limiting groove is provided with a clamping spring, the limiting pin penetrates through the connecting plate, the first limiting groove and the second limiting groove, one end of the limiting pin protrudes from one side of the connecting plate, and the other end of the limiting pin is located in the second limiting groove and is clamped with the clamping spring.

2. The tractor-trailer device of claim 1, wherein, The outer ring side of the driving ring is provided with two opposite hinge interfaces, and one end of the two pull rods is respectively movably inserted into the two hinge interfaces.

3. The tractor-trailer device of claim 1, wherein, The driving ring is located on the outer side of the mounting plate, and a rotating handle is connected to the driving ring.

4. The tractor-trailer device of claim 1, wherein, The first and second telescopic holes are blind holes, the first and second telescopic holes are coaxially arranged, one end of the first and second telescopic holes away from each other is an open end, the bottom of the first and second telescopic holes is respectively provided with a first spring and a second spring, and the first and second elastic pins are respectively connected with the first and second springs.

5. The tractor-trailer device of claim 1, wherein, The middle part of the mounting plate is provided with a connecting hole penetrating through the two side surfaces, and a first pin hole is further provided on the mounting plate, the axis of the first pin hole is perpendicular to the axis of the connecting hole, one end of the first pin hole is in communication with the connecting hole; the connecting column of the towing hook penetrates through the connecting hole and is locked in the middle part of the mounting plate through a locking nut, a second pin hole is provided on the connecting column, the axis of the second pin hole is perpendicular to the axis of the connecting column, the first pin hole and the second pin hole are coaxially and correspondingly arranged and connected through a pin.

6. A tractor characterised in that, The tractor comprises a tractor body and the towing device for tractor according to any one of claims 1 to 5, and the towing side of the towing bracket is mounted on the tractor body through fixing bolts.

Images