CN220965535U - Agricultural machine and pulling device - Google Patents

Abstract

The application relates to the technical field of agricultural machinery and discloses a pulling device and agricultural machinery, wherein the pulling device is arranged on a traction frame and comprises a pulling component, a locking shaft and an adjusting component; the pulling component is in sliding fit with the inner peripheral wall of the traction frame along the height direction, and two ends of the pulling component along the horizontal direction are respectively provided with a sliding groove; the locking shaft is arranged in the sliding groove in a sliding way, and through holes for the locking shaft to be inserted are formed in the inner wall of the traction frame at intervals along the height direction; the adjusting component is arranged on the pulling component and is used for driving the locking shaft to extend out or retract from the sliding groove in a sliding manner along the horizontal direction so as to drive the locking shaft to unlock or lock with the through hole. The locking shaft is driven by the adjusting component to extend out of the sliding groove and is inserted into the through hole, so that the pulling device and the traction frame are locked; the locking shaft is driven to withdraw from the through hole and retract into the sliding groove, so that the pulling device and the traction frame are unlocked, and the position of the pulling device in the height direction can be adjusted at the moment.

Description

Agricultural machine and pulling device

Technical Field

The application belongs to the technical field of agricultural machinery, and particularly relates to agricultural machinery and a pulling device.

Background

The towing device is a connecting device for connecting a tractor with farm tools such as a trailer, and in the process of matching operation of the traditional tractor and the farm tools, the height requirement of the towing hook is that the towing hook is required to be consistent with the farm tool connecting ring, so that when the farm tools with different ground clearance height requirements are met, the ground clearance height of the towing hook is required to be readjusted so as to adapt to the farm tool requirements. The traditional connection mode of the towing hook on the traction frame is that the towing hook is fixed on the traction frame through a long towing pin, the towing pin is limited through a safety lock pin, if the ground clearance of the towing hook needs to be adjusted, a driver needs to take down the safety lock pin in actual operation, then take out the towing pin, readjust the hole site corresponding to the towing hook, penetrate into the towing pin, and finally insert the safety lock pin. The whole disassembly and assembly process is extremely complicated to operate by one person, two persons are often needed to cooperate in actual operation, and the labor intensity of a driver is easily increased.

Disclosure of utility model

The application aims to provide an agricultural machine and a traction device, which can quickly adjust the height position of the traction device and realize the self-locking function with a traction frame _.

In order to achieve the above object, the present application provides a pulling device, which is mounted on a pulling frame, wherein a plurality of through holes are spaced apart in a height direction on an inner wall of the pulling frame, and the pulling device comprises:

the traction frame is used for being matched with the sliding frame in a sliding way, and sliding grooves are respectively formed in two ends of the traction frame along the horizontal direction;

the locking shaft is arranged in the chute in a sliding manner and is inserted into the through hole; and

The adjusting component is arranged on the pulling component and used for driving the locking shaft to extend out or retract from the sliding groove in a sliding manner along the horizontal direction so as to drive the locking shaft to unlock or lock with the through hole.

In an embodiment of the application, the side of the rear mounting plate facing the front mounting plate is provided with a fixing ring, and the adjusting assembly comprises:

the first end of the first rod body is pivotally connected with the front mounting plate;

The two ends of the second rod body are respectively and pivotally connected with the second end of the first rod body and the locking shaft; and

The adjusting ring is rotatably sleeved on the periphery of the fixing ring, two arc-shaped guide holes are symmetrically arranged on the adjusting ring relative to the central axis in the height direction, and the inner concave surfaces of the two arc-shaped guide holes are oppositely arranged;

The first rod body is connected with the second rod body through a pivot connecting shaft, and the pivot connecting shaft is inserted into the arc-shaped guide hole in a sliding mode.

In the embodiment of the application, the front mounting plate and the rear mounting plate are respectively provided with an arc-shaped groove, the arc-shaped grooves are arranged corresponding to the arc-shaped guide holes, and the pivot connecting shaft penetrates through the arc-shaped guide holes and movably abuts against the bottom wall of the arc-shaped groove.

In an embodiment of the application, the adjusting assembly further comprises an elastic member, a connecting rod is connected between the rear mounting plate and the front mounting plate, the elastic member is arranged along the height direction, one end of the elastic member is hung on the connecting rod, and the other end of the elastic member is hung on the pivot connecting shaft.

In an embodiment of the application, the top of the adjusting ring is provided with a handle position.

In an embodiment of the application, the pulling device further comprises a pulling hook component, wherein the pulling hook component is arranged on one surface of the front mounting plate, which is away from the rear mounting plate, and is used for being connected with an external vehicle body in a hanging mode.

In an embodiment of the present application, a hitch assembly includes:

a connecting column;

The connecting handle is arranged at the top of the connecting column;

A hanging chain which is hung at the end part of the connecting handle; and

The towing hook is inserted into the fixing ring, the end part of the towing hook is provided with a mounting lug plate, the mounting lug plate is positioned on one surface of the front mounting plate, which is away from the rear mounting plate, and the mounting lug plate forms a lug hole for inserting the connecting column.

In the embodiment of the application, a plurality of first mounting holes are formed in the rear mounting plate in a matched manner with the fixed ring, a positioning spring and a positioning ball are sequentially arranged in each first mounting hole, one end of the positioning spring is abutted against the bottom wall of the first mounting hole, the other end of the positioning spring ejects the positioning ball part out of the first mounting hole, and one side of the positioning ball, which is away from the positioning spring, is abutted against the fixed ring and can rotate along with the rotation of the fixed ring.

In the embodiment of the application, a plurality of second mounting holes are circumferentially arranged on one side of the fixing ring, which is close to the rear mounting plate, and the exposed parts of the positioning balls in the first mounting holes are embedded into the second mounting holes, so that the sizes of the first mounting holes and the second mounting holes are the same.

In an embodiment of the application, an agricultural machine is proposed, comprising a traction frame and a hitch as described above.

Through the technical scheme, the agricultural machinery and the towing device provided by the embodiment of the utility model have the following beneficial effects:

According to the application, the adjusting component is driven to apply acting force to the locking shaft, so that the locking shaft is driven to extend or retract from sliding grooves formed in two ends of the adjusting component. When the locking shaft completely extends out of the sliding groove, the locking shaft is inserted into a through hole formed in the traction frame, so that the adjusting component is locked on the traction frame, and the traction device is in a locking state and cannot adjust the height of the traction device; when the locking shaft is completely retracted into the sliding groove, the locking shaft which is originally inserted into the through hole exits from the through hole, the pulling device is in an unlocking state, and the pulling device can be adjusted in the height direction relative to the pulling frame, so that the position of the pulling device can be quickly adjusted in the height direction.

Additional features and advantages of embodiments of the application will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain, without limitation, the embodiments of the application. Other figures may be made from the structures shown in these figures without inventive effort for a person of ordinary skill in the art. In the drawings:

FIG. 1 is a schematic view of a hitch mounted on a towing bracket according to the present application;

FIG. 2 is a schematic front view of the hitch with the front mounting plate and hitch hook assembly removed, in accordance with the present application;

FIG. 3 is a schematic view of the construction of the hitch with the front mounting plate, retaining ring, adjustment ring and hitch hook assembly removed and one side of the locking shaft, in accordance with the present application;

FIG. 4 is a schematic view of the structure of the mounting plate and hitch assembly with the hitch device removed, in accordance with the present application;

FIG. 5 is a schematic view of the structure of the rear mounting plate in the hitch according to the present application;

FIG. 6 is a schematic view of the structure of a hitch assembly in a hitch assembly according to the present application;

FIG. 7 is a schematic view of a retaining ring of the hitch according to the present application;

FIG. 8 is a schematic view of a structure of a retaining ring in a hitch according to another aspect of the present application;

fig. 9 is a schematic structural view of a locking ring in a hitch according to the present application.

Description of the reference numerals

1. Traction frame 43 adjusting ring

11. Arc-shaped guide hole of through hole 431

2. Handle position of pulling assembly 432

21. Chute 44 pivot connection shaft

22. Front mounting plate 45 elastic member

23. Rear mounting plate 5 hitch assembly

24. Fixed ring 51 connecting column

25. The arc-shaped groove 52 is connected with the handle

26. Connecting rod 53 hanging chain

27. First mounting hole 54 hitch hook

28. First screw portion of second mounting hole 541

29. Second screw portion of partition 542

3. Locking shaft 6 positioning spring

4. Adjusting component 7 positioning ball

41. First rod body 8 locking ring

42. Second rod body

Detailed Description

The following describes specific embodiments of the present application in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the application, are not intended to limit the application.

The agricultural machine and the hitch according to the present application are described below with reference to the accompanying drawings.

As shown in fig. 1, in the embodiment of the present application, a pulling device is provided and is mounted on a pulling frame 1, and the pulling device includes a pulling assembly 2, a locking shaft 3 and an adjusting assembly 4. The pulling component 2 is in sliding fit with the inner peripheral wall of the traction frame 1 along the height direction, and sliding grooves 21 are respectively formed in two ends of the pulling component 2 along the horizontal direction. The locking shaft 3 is slidably arranged in the chute 21, through holes 11 for the locking shaft 3 to be inserted are formed in the inner wall of the traction frame 1 at intervals along the height direction, the traction devices are arranged at different heights, and the through holes 11 on the two sides of the inner wall are symmetrically arranged. The adjusting component 4 is installed on the pulling component 2, and the adjusting component 4 is used for driving the locking shaft 3 to extend out or retract from the chute 21 in a sliding manner along the horizontal direction so as to drive the locking shaft 3 to be unlocked or locked with the through hole 11.

Wherein, the pulling assembly 2 includes preceding mounting panel 22, back mounting panel 23 and sets up a plurality of baffles 29 between preceding mounting panel 22 and back mounting panel 23, every baffle 29 all is close to preceding mounting panel 22 and back mounting panel 23's tip setting, still is equipped with a plurality of fasteners on the pulling assembly 2, and the fastener loops through preceding mounting panel 22, baffle 29 and back mounting panel 23 with preceding mounting panel 22 and back mounting panel 23 detachable connection, is convenient for through changing baffle 29 and locking axle 3 to adapt to the rotatory pulling device of most adjustable off-ground height in the market at present. As shown in fig. 2 and 3, two partition plates 29 are arranged at the left and right ends of the pulling assembly 2, two partition plates 29 at the same side are arranged along the height direction, a chute 21 for placing the locking shaft 3 is formed between the two partition plates 29, when the adjusting assemblies 4 at the left and right sides of the pulling device drive the locking shaft 3 to extend out of the chute 21 and reach the maximum extension limit, the locking shaft 3 is inserted into a through hole 11 positioned at the same horizontal position on the pulling frame 1, and at the moment, the pulling device is in a locking state and cannot adjust the position of the pulling device along the height direction; when the adjusting components 4 on the left side and the right side of the pulling device withdraw from the through holes 11 and retract into the sliding groove 21, the pulling device is in an unlocking state, and the pulling device can adjust the position of the pulling device inserted on the pulling frame 1 along the height direction, so that the pulling device can be quickly adjusted in the height direction.

As shown in fig. 2 and 3, in the embodiment of the present application, the side of the rear mounting plate 23 facing the front mounting plate 22 is provided with a fixing ring 24, and the adjusting assembly 4 includes a first rod 41, a second rod 42 and an adjusting ring 43. A first end of the first lever 41 is pivotally connected to the front mounting plate 22. Both ends of the second rod body 42 are pivotally connected to the second end of the first rod body 41 and the locking shaft 3, respectively. The adjusting ring 43 is rotatably sleeved on the outer periphery of the fixed ring 24, two arc-shaped guide holes 431 are symmetrically arranged on the adjusting ring 43 about the central axis in the height direction, and the inner concave surfaces of the two arc-shaped guide holes 431 are oppositely arranged. The first rod 41 and the second rod 42 are connected by a pivot connecting shaft 44, and the pivot connecting shaft 44 is slidably inserted into the arc-shaped guide hole 431. In particular, for the adjustment assembly 4 located on the same side, the first end of the first rod 41 is the end facing away from the locking shaft 3.

The adjusting ring 43 is rotatably sleeved on the outer periphery of the fixing ring 24, but the rotation of the adjusting ring 43 does not drive the fixing ring 24 to move along with the adjusting ring 43. In the locked state, the locking shaft 3 is inserted into the through hole 11, the first rod 41, the second rod 42 and the locking shaft 3 are located at the same horizontal position, the second rod 42 and the locking shaft 3 are in pivot connection through a pin shaft, the first end of the first rod 41 is fixed on the front mounting plate 22 through the pin shaft, the second end of the first rod 41 and the second rod 42 are connected through a pivot connection shaft 44, and the pivot connection shaft 44 penetrates through the arc-shaped guide hole 431 and is arranged at one end, far away from the connecting rod 26, of the arc-shaped guide hole 431. When the adjusting ring 43 rotates to the other end of the arc-shaped guide hole 431 in the counterclockwise direction and abuts against the pivot connection shaft 44, the pivot connection shaft 44 is continuously applied with a rotation driving force, at this time, the pivot connection shaft 44 moves along the opening direction of the arc-shaped groove 25 under the action of the rotation driving force, and the first rod 41 and the second rod 42 are pulled to move together with the pivot connection shaft 44, so that the distance between two pins on the adjusting assembly 4 arranged on the same side is shortened, the locking shaft 3 is withdrawn from the through hole 11, the locking shaft 3 is retracted into the chute 21, at this time, the pulling device is in an unlocked state, and the pulling device can move along the height direction. When the adjusting ring 43 rotates clockwise to contact with the inner wall of the end of the arc-shaped guide hole 431 away from the connecting rod 26, the first rod 41, the second rod 42 and the locking shaft 3 return to the same horizontal position again, and the locking shaft 3 is inserted into the through hole 11 again, so that the pulling device is locked on the pulling frame 1, and at this time, the pulling device is in a locked state, and the pulling device is connected to the pulling frame 1 and is not movable. In particular, the length of the first rod 41 and the second rod 42 may be adjusted according to the actual needs.

As shown in fig. 3, in the embodiment of the present application, the front mounting plate 22 and the rear mounting plate 23 are symmetrically provided with arc grooves 25, the arc grooves 25 are disposed corresponding to the arc guide holes 431, and the pivot connection shaft 44 penetrates the arc guide holes 431 and movably abuts against the bottom wall of the arc groove 25.

Wherein, the both ends of the pivot connection shaft 44 are respectively inserted into the arc-shaped grooves 25 formed on the front mounting plate 22 and the rear mounting plate 23, thereby ensuring that the adjusting ring 43 can be kept stable when a rotational driving force is applied to the pivot connection shaft 44. In the locked condition, the pivot connection shaft 44 is located at the end of the arcuate slot 25 adjacent the connecting rod 26; in the unlocked state, the pivot connection shaft 44 is located at the end of the arcuate slot 25 remote from the connection rod 26; the arrangement of the arcuate slot 25 in correspondence with the arcuate guide hole 431 ensures that the pivotal connection shaft 44 can move along the arcuate slot 25 under the action of the driving force, and can effectively cooperate with the adjustment ring 43.

As shown in fig. 2, in the embodiment of the present application, the adjusting assembly 4 further includes an elastic member 45, a connecting rod 26 is connected between the rear mounting plate 23 and the front mounting plate 22, and the elastic member 45 is disposed in the height direction and has one end hooked on the connecting rod 26 and the other end hooked on the pivot connecting shaft 44; the elastic member 45 is an extension spring, and the extension spring can effectively ensure that the pulling device can realize a self-locking function with the traction frame 1.

In the adjusting assembly 4 located on the same side, when the pivot connecting shaft 44 moves along the arc-shaped groove 25 to the end far away from the connecting rod 26 under the driving of the adjusting ring 43, the pulling device is in an unlocking state, the tension spring arranged between the connecting rod 26 and the pivot connecting shaft 44 is in a tension state and can provide tension force directed to the connecting rod 26, and once the adjusting ring 43 is loosened and the rotational driving force is not continuously applied to the adjusting ring 43, the tension spring can pull the pivot connecting shaft 44 back to the initial position where the pivot connecting shaft 44 is not subjected to the rotational driving force of the adjusting ring 43, and the pulling device is in a locking state, so that the self-locking efficiency of the pulling device is improved.

As shown in fig. 4, in the embodiment of the present application, the top of the adjusting ring 43 is provided with a handle 432, which can effectively improve the working efficiency of the adjusting ring 43 for driving the locking shaft 3 to lock.

As shown in fig. 6, the trailer device further comprises a trailer hook component 5, the trailer hook component 5 is mounted on one surface of the front mounting plate 22, which faces away from the rear mounting plate 23, the trailer hook component 5 is used for being connected with an external vehicle body in a hanging mode, and the trailer hook component 2 is matched with the locking shaft 3 to be used for being connected with a carriage behind the external vehicle body, so that the trailer device can be ensured to play a role in connecting the vehicle body and the carriage.

As shown in fig. 6 and 9, the hitch assembly 5 includes a connection post 51, a connection handle 52, a hitch chain 53, and a hitch hook 54. The connecting handle 52 is arranged at the top of the connecting column 51, and the hanging chain 53 is hung at the end part of the connecting handle 52; the towing hook 54 is inserted into the fixing ring 24, and a first end of the towing hook 54 is provided with a mounting lug plate, the mounting lug plate is positioned on one surface of the front mounting plate 22, which faces away from the rear mounting plate 23, and the mounting lug plate forms a lug hole for inserting the connecting column 51.

The first end of the hanging chain 53 is connected to the connecting handle 52, the second end of the hanging chain 53 is connected to the bottom end of the connecting column 51, and is used for locking the connecting column 51 on the pulling hook 54 and connecting with an external vehicle body through the connecting column 51; the circumference of the pulling hook 54 is gradually reduced along the first end of the pulling hook 54 to the second end of the pulling hook 54, a first thread portion 541 and a second thread portion 542 are arranged at intervals in a trapezoid shape, the pulling hook 54 is arranged in a trapezoid shape along the first end of the pulling hook 54 to the second end of the pulling hook 54, a first smooth portion and a second smooth portion are further arranged on the pulling hook 54, and the front mounting plate 22 and the rear mounting plate 23 are respectively arranged on the first smooth portion and the second smooth portion; the attachment lug plate, the first smooth portion, the first screw portion 541, the second smooth portion, and the second screw portion 542 are provided in this order from the first end of the hitch hook 54 to the second end of the hitch hook 54. Wherein, the first screw thread portion 541 is provided with a fixing ring 24 and is detachably connected with the pulling hook 54 through a fixing bolt, and the second screw thread portion 542 is provided with a locking ring 8 and locks the relative position of the locking ring 8 through a cotter pin, so as to prevent the pulling hook 54 from falling loose.

As shown in fig. 4 and 5, in the embodiment of the present application, a plurality of first mounting holes 27 are provided on the rear mounting plate 23 in cooperation with the fixing ring 24, and a positioning spring 6 and a positioning ball 7 are sequentially installed in each first mounting hole 27, one end of the positioning spring 6 abuts against the bottom wall of the first mounting hole 27, the other end ejects the positioning ball 7 partially out of the first mounting hole 27, one side of the positioning ball 7 away from the positioning spring 6 abuts against the fixing ring 24 and can rotate along with the rotation of the fixing ring 24, so that the fixing ring 24 can be adjusted in rotation and can be selectively stopped at different positions.

As shown in fig. 7 and 8, in the embodiment of the present application, a plurality of second mounting holes 28 are circumferentially arranged on one side of the fixing ring 24 near the rear mounting plate 23, the exposed portion of the positioning ball 7 in the first mounting hole 27 is embedded in the second mounting holes 28, the first mounting hole 27 and the second mounting hole 28 have the same size, but the first mounting hole 27 and the second mounting hole 28 are not provided to the same depth, and the second mounting hole 28 has a depth capable of accommodating only half of the positioning ball 7.

Specifically, the number of the first mounting holes 27 of the rear mounting plate 23 is 6 and is equally spaced, each first mounting hole 27 is sequentially mounted with the positioning spring 6 and the positioning ball 7, and the number of the second mounting holes 28 on the fixing ring 24 is 12 and is equally spaced, and the hitch hook 54 is detachably connected to the fixing ring 24, so that the fixing ring 24 can be selectively stopped at 12 positions to facilitate adjustment of the angle of the hitch hook 54. When the position of the towing hook 54 needs to be adjusted, the fixing ring 24 can rotate clockwise or anticlockwise by applying a rotation force to the towing hook 54, and at this time, the fixing ring 24 will apply a force to the positioning ball 7 to press the positioning ball 7 into the first mounting hole 27 briefly, so that the positioning spring 6 is in a compressed state. When the angle adjustment is finished, the positioning spring 6 is in an extension state, the positioning spring 6 jacks up the positioning ball 7 from the first mounting hole 27, half of the positioning ball 7 is embedded into the second mounting hole 28, and the relative positions of the fixing ring 24 and the rear mounting plate 23 are fixed again; thereby ensuring that multi-angle adjustment of the tow hook 54 can be achieved by selectively stopping the securing ring 24 in 12 different positions, enhancing the ability to avoid the risk of tractor rollover.

In addition, the application also provides an agricultural machine, which comprises the traction frame 1 and the traction device, wherein the traction frame 1 is a carriage part, the connecting column 51 is connected with an external carriage, and the traction device is arranged between the external carriage and the carriage to play a role of connection and fixation. The agricultural machine can be a tractor, a seeder or a harvester and other machines which need to be connected with farm tools for operation, the adjusting component 4 controls the locking shaft 3 to extend out of the chute 21 completely and be inserted into the through hole 11, so that the trailer is locked on the traction frame 1, the adjusting component 4 controls the locking shaft 3 to exit from the through hole 11 and retract into the chute 21 completely, the trailer is unlocked from the traction frame 1, and the height of the trailer can be adjusted in the height direction. Since the agricultural machine adopts all embodiments of the hitching means, it also has all the advantageous effects brought by the hitching means, and detailed description thereof will be omitted.

In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (10)

1. A hitch device mounted on a hitch frame (1), a plurality of through holes (11) being provided on an inner wall of the hitch frame (1) at intervals along a height direction, the hitch device comprising:

The traction frame (1) is used for being matched with the traction frame (2) in a sliding mode, and sliding grooves (21) are respectively formed in two ends of the traction frame (2) along the horizontal direction;

the locking shaft (3) is arranged in the sliding groove (21) in a sliding manner, and the locking shaft (3) is inserted into the through hole (11); and

The adjusting component (4) is arranged on the pulling component (2), and the adjusting component (4) is used for driving the locking shaft (3) to extend out or retract from the sliding groove (21) in a sliding manner along the horizontal direction so as to drive the locking shaft (3) to be unlocked or locked with the through hole (11).

2. A hitch device as claimed in claim 1, characterized in that the hitch assembly (2) comprises a front mounting plate (22) and a rear mounting plate (23), the rear mounting plate (23) being provided with a securing ring (24) on the side facing the front mounting plate (22), the adjustment assembly (4) comprising:

A first lever body (41) having a first end pivotally connected to the front mounting plate (22);

The two ends of the second rod body (42) are respectively and pivotally connected with the second end of the first rod body (41) and the locking shaft (3); and

The adjusting ring (43) is rotatably sleeved on the periphery of the fixed ring (24), two arc-shaped guide holes (431) are symmetrically arranged on the adjusting ring (43) about the central axis in the height direction, and the inner concave surfaces of the two arc-shaped guide holes (431) are oppositely arranged;

The first rod body (41) is connected with the second rod body (42) through a pivot connecting shaft (44), and the pivot connecting shaft (44) is slidably inserted into the arc-shaped guide hole (431).

3. The pulling device according to claim 2, wherein the front mounting plate (22) and the rear mounting plate (23) are respectively provided with an arc-shaped groove (25), the arc-shaped grooves (25) are arranged corresponding to the arc-shaped guide holes (431), and the pivot connecting shaft (44) penetrates through the arc-shaped guide holes (431) and movably abuts against the bottom wall of the arc-shaped grooves (25).

4. The hitch device as claimed in claim 2, characterized in that the adjustment assembly (4) further comprises an elastic element (45), a connecting rod (26) being connected between the rear mounting plate (23) and the front mounting plate (22), the elastic element (45) being arranged in the height direction and having one end being hooked to the connecting rod (26) and the other end being hooked to the pivot connection shaft (44).

5. A hitch device as claimed in claim 2, characterized in that the top of the adjustment ring (43) is provided with a grip position (432).

6. The hitch device as claimed in claim 2, characterized in that it further comprises a hitch assembly (5), the hitch assembly (5) being mounted to a face of the front mounting plate (22) facing away from the rear mounting plate (23), the hitch assembly (5) being adapted to be coupled to an external vehicle body.

7. A hitch device as claimed in claim 6, characterized in that the hitch hook assembly (5) comprises:

A connecting column (51);

a connection handle (52) arranged on the top of the connection column (51);

A link (53) which is hung at the end of the connecting handle (52); and

The drag hook (54) is inserted into the fixed ring (24), an installation lug plate is arranged at the end part of the drag hook (54), the installation lug plate is positioned on one surface of the front installation plate (22) deviating from the rear installation plate (23), and the installation lug plate forms a lug hole for inserting the connecting column (51).

8. The pulling device according to claim 7, wherein a plurality of first mounting holes (27) are formed in the rear mounting plate (23) in a manner of being matched with the fixing ring (24), a positioning spring (6) and a positioning ball (7) are sequentially arranged in each first mounting hole (27), one end of the positioning spring (6) is abutted to the bottom wall of the first mounting hole (27), the other end of the positioning spring partially ejects the positioning ball (7) out of the first mounting hole (27), and one side, deviating from the positioning spring (6), of the positioning ball (7) is abutted to the fixing ring (24) and can rotate along with the rotation of the fixing ring (24).

9. The hitch device as claimed in claim 8, characterized in that a plurality of second mounting holes (28) are circumferentially arranged on the side of the securing ring (24) adjacent to the rear mounting plate (23), the exposed portions of the locating balls (7) in the first mounting holes (27) being embedded in the second mounting holes (28), the first mounting holes (27) being the same size as the second mounting holes (28).

10. Agricultural machine, characterized by comprising a traction frame (1) and a hitch device according to any one of claims 1 to 9.