Trailing device for tractor

Abstract

The invention discloses a towing device for a tractor, which belongs to the technical field of automobile parts and comprises a base fixedly mounted on a rear axle box of the tractor, a left oil cylinder mounting seat and a right oil cylinder mounting seat for three-point suspension are symmetrically mounted on two sides of the base, and an upper pull rod fixing seat is fixedly mounted at the upper end of the base. A driving structure is obliquely installed at the end, away from a rear axle box body of the tractor, of the base, the lower end of the driving structure is connected with a pull hanging structure, and an auxiliary automatic locking structure is installed between the pull hanging structure and the base.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, and in particular to a towing device for a tractor. Background Art

[0002] The word tractor comes from the Latin word trahere, which means "pull". It is a kind of equipment used to tow and pull other equipment that cannot move on its own. It can be called a "universal machine" in the agricultural field. Therefore, the towing device is an important part of it, which is used to tow agricultural machinery or trailers for farming, harvesting and other operations.

[0003] In the prior art, a towing device is installed on a tractor, and a towing rod on a trailer or agricultural machinery (hereinafter referred to as a trailer) is provided with a towing hole. The towing hole of the trailer is pulled to the U-shaped hook of the towing device, and the towing hole is aligned with the towing pin hole of the towing device, and then the towing pin is inserted, so that the connection between the trailer and the tractor can be achieved. Existing towing devices are mostly fixed U-shaped hooks and adjustable U-shaped hooks with sliding guide grooves. The height of the U-shaped hook needs to meet the requirements of the vehicle departure angle, so the height of the U-shaped hook of the towing device is usually adjusted from the ground. The towing device with an adjustable U-shaped hook with a guide groove is provided with sliding guide grooves on the fixed plates on both sides, and pin holes with fixed spacing are provided in the sliding guide grooves, so that the height of the U-shaped hook of the towing device can be adjusted from the ground by manpower as needed to complete a proper connection with the trailer. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a towing device for a tractor, which can drive the towing hook to move downward by cooperating with the lower pad through the hydraulic cylinder, so as to facilitate the connection between the towing hook and the towing rod of the trailer. The hydraulic cylinder can be used to lift the towing rod of the trailer, and the towing rod can be lifted upward without additional lifting equipment or manpower movement, which can effectively improve the connection efficiency between the trailer and the tractor.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A towing device for a tractor comprises a base fixedly mounted on a rear axle box of the tractor, a left cylinder mounting seat and a right cylinder mounting seat (for mounting a three-point suspension) being symmetrically mounted on both sides of the base, an upper pull rod mounting seat being fixedly mounted on the upper end of the base, a driving structure being obliquely mounted on one end of the base away from the rear axle box of the tractor, a towing structure being connected to the lower end of the driving structure, and auxiliary automatic locking and unlocking can be achieved between the towing structure and the two bases.

[0006] Preferably, the base includes two parallel side plates, one end of the two side plates is fixedly mounted on the tractor rear axle box, the left cylinder mounting seat and the right cylinder mounting seat are both fixedly mounted on the side of the corresponding side plate close to the tractor rear axle box, a vertical plate is fixedly mounted between the two side plates, the vertical plate is located between the left cylinder mounting seat and the right cylinder mounting seat, a through hole is provided on the vertical plate below the upper pull rod fixing seat to install the power output shaft, and the driving structure is fixedly mounted on one end of the two side plates away from the tractor rear axle box.

[0007] Preferably, the driving structure comprises two hydraulic cylinders parallel to each other, the two hydraulic cylinders are correspondingly mounted on the two side plates, the two protruding ends of the two hydraulic cylinders are fixedly connected in parallel via a lower pad, and the towing hook is fixedly mounted on the lower pad.

[0008] Preferably, the towing structure includes a lower pad fixedly mounted on the protruding ends of the two hydraulic cylinders and arranged horizontally, a towing hook is fixedly mounted on the middle part of one end of the lower pad away from the vertical plate, and an upper pressure plate cooperating with the towing hook is fixedly mounted on the cylinder barrels of the two hydraulic cylinders.

[0009] Preferably, a limiting plate is provided between the upper pressing plate and the lower pad, and the limiting plate is fixedly mounted on an end of the upper pressing plate away from the towing hook.

[0010] Preferably, the auxiliary locking structure includes a lifting lock shaft rotatably installed on the two side panels, both ends of the lifting lock shaft respectively pass through the two side panels and are fixedly installed with rotating lock blocks, the lower pad is fixedly installed with a sliding lock block matching the rotating lock block, one end of the lifting lock shaft between the two side panels is fixedly installed with a locking sleeve, the locking sleeve and the lifting lock shaft between the adjacent side panels are provided with a torsion spring, the torsion spring matches the locking sleeve, and a pull rod fork joint is hingedly installed on the locking sleeve for driving the lifting lock shaft to rotate, and the end of the pull rod fork joint is connected to a flexible shaft so that it can be operated in the cab.

[0011] Preferably, limiting bolts cooperating with the locking sleeve are fixedly mounted on the side plates on both sides of the lifting lock shaft close to the torsion spring.

[0012] Preferably, a reinforced protective cover is provided on the outer side of the rotating lock block, and the reinforced protective cover is fixedly mounted on the corresponding side plate and the hydraulic cylinder, and the sliding lock block extends into the reinforced protective cover to cooperate with the rotating lock block.

[0013] Preferably, an angle is provided between the hydraulic cylinder and the lower pad, and the angle is set to be 75° to 85°.

[0014] The beneficial effects of the present invention are as follows: 1. In the present invention, the towing hook can be driven downward by the cooperation of the hydraulic cylinder and the lower pad, which facilitates the connection between the towing hook and the towing rod of the trailer. The towing rod of the trailer can be lifted by the hydraulic cylinder, and the towing rod can be lifted upward without related lifting equipment or manpower, which can effectively improve the installation efficiency between the trailer and the tractor; 2. The present invention adopts a design of a hydraulic cylinder, which pushes the lower pad downward. By adding support to the lower pad, the rear axle of the tractor can be lifted by the reaction force, which is convenient for adjusting the wheelbase of the tractor's rear wheels and can effectively reduce the difficulty of adjusting the wheelbase of the rear wheels; 3. The hydraulic cylinder of the present invention adopts an inclined design, so that the towing hook can move to the rear of the tractor during the downward movement, so that space is reserved between the rear mounting structure of the tractor and the trailer drawbar, which also increases the driver's field of vision in the cab, facilitates the driver to adjust the position of the towing hook, and makes the connection between the trailer and the tractor simpler and more convenient; 4. In the present invention, the output end of the hydraulic cylinder can be supported by cooperating with the sliding lock block and the rotating lock block, which can effectively avoid safety accidents caused by pressure relief of the hydraulic cylinder.

[0015] 5. The present invention is provided with a reinforced protective cover, which is fixedly connected to the two side plates and the hydraulic cylinder, which not only increases the strength of the structure, but also effectively prevents weeds or straw from penetrating during labor operations without affecting the use of the self-locking structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a towing device for a tractor of the present invention; Figure 2 It is a left side view of a towing device for a tractor of the present invention; Figure 3 A schematic diagram of a rotating lock block of a tractor towing device according to the present invention; Figure 4 The present invention is a schematic diagram of a sliding lock block of a tractor towing device.

[0017] In the figure: 1-side plate, 2-vertical plate, 3-left cylinder mounting seat, 4-right cylinder mounting seat, 5-upper pull rod fixing seat, 6-hydraulic cylinder, 7-lower pad, 8-tow hook, 9-upper pressure plate, 10-lifting lock shaft, 11-rotating lock block, 12-sliding lock block, 13-lock sleeve, 14-torsion spring, 15-pull rod fork joint, 16-limiting bolt, 17-reinforced protective cover, 18-limiting plate. DETAILED DESCRIPTION

[0018] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0019] like Figure 1-4A towing device for a tractor shown in the figure includes a base fixedly mounted on the rear axle box of the tractor, with a left cylinder mounting seat 3 and a right cylinder mounting seat 4 symmetrically mounted on both sides of the base, an upper pull rod mounting seat 5 fixedly mounted on the upper end of the base, a driving structure obliquely mounted on the end of the base away from the rear axle box of the tractor, and a towing structure connected to the lower end of the driving structure. The driving structure adopts an inclined design so that the towing structure moves forward while moving downward, so that space is reserved between other structures installed on the rear axle of the tractor and the trailer, thereby increasing the driver's field of vision, facilitating the driver to adjust the position of the towing hook 8, and easily realizing the connection between the trailer and the tractor, and an auxiliary automatic locking structure is installed between the towing structure and the base.

[0020] The base includes two parallel side panels 1, one end of the two side panels 1 is fixedly mounted on the tractor rear axle box, the left cylinder mounting seat 3 and the right cylinder mounting seat 4 are fixedly mounted on the side of the corresponding side panel 1 close to the tractor rear axle box, the left cylinder mounting seat 3 and the right cylinder mounting seat 4 are used to install the lifting cylinder and the connecting rod, the connecting rod installed on the left cylinder mounting seat 3 and the right cylinder mounting seat 4 and the upper pull rod installed on the upper pull rod fixing seat 5 constitute a three-point suspension for trailer installation, a vertical plate 2 is fixedly installed between the two side panels 1, and the upper The pull rod fixing seat 5 is fixedly installed on the upper end of the vertical plate 2, and the vertical plate 2 is located between the left cylinder mounting seat 3 and the right cylinder mounting seat 4. The vertical plate 2 serves as a support for the side plate 1 of the left cylinder mounting seat 3 and the side plate 1 of the right cylinder mounting seat 4, which can effectively improve the structural strength of the left cylinder mounting seat 3 and the right cylinder mounting seat 4 and the strength of the towing device. A through hole is provided on the vertical plate 2 below the upper pull rod fixing seat 5 in order not to affect the installation and use of the power output shaft. The driving structure is fixedly installed on one end of the two side plates 1 away from the tractor rear axle box.

[0021] The driving structure includes two hydraulic cylinders 6 parallel to each other, and the two hydraulic cylinders 6 are fixedly mounted on the two side plates 1 respectively. The extended ends of the two hydraulic cylinders 6 are tilted and moved downward. The trailer structure is fixedly mounted on the extended ends of the two hydraulic cylinders 6. The trailer structure is pushed up and down by the hydraulic cylinders 6. By increasing support for the trailer structure, the rear axle of the tractor can be lifted by utilizing the reaction force, which facilitates the adjustment of the track width of the rear wheels of the tractor, effectively reduces the difficulty of adjusting the track width of the rear wheels, and can significantly improve the working efficiency.

[0022] The towing structure includes a lower pad 7 fixedly mounted on the protruding ends of the two hydraulic cylinders 6 and arranged horizontally, a towing hook 8 is fixedly mounted on the middle of one end of the lower pad 7 away from the vertical plate 2, and an upper pressure plate 9 matched with the towing hook 8 is fixedly mounted on the cylinder barrels of the two hydraulic cylinders 6. The towing hook 8 and the upper pressure plate 9 are matched to prevent the towing hook 8 from being separated from the trailer towing rod.

[0023] A limit plate 18 is provided between the upper pressing plate 9 and the lower pad 7 . The limit plate 18 is fixedly mounted on one end of the upper pressing plate 9 away from the towing hook 8 , thereby enhancing the connection strength of the driving structure.

[0024] The auxiliary automatic locking structure includes a lifting lock shaft 10 rotatably mounted on the two side panels 1, and rotating lock blocks 11 are fixedly mounted on both ends of the lifting lock shaft 10 respectively passing through the two side panels 1, and a sliding lock block 12 matching the rotating lock block 11 is fixedly mounted on the lower pad 7, and a locking sleeve 13 is fixedly mounted on one end of the lifting lock shaft 10 between the two side panels 1, and a torsion spring 14 is mounted on the lifting lock shaft 10 between the locking sleeve 13 and the adjacent side panel 1, and the torsion spring 14 matches the locking sleeve 13, and a locking member for driving the lifting lock is hingedly mounted on the locking sleeve 13. The pull rod fork joint 15 of the rotating shaft 10 is connected to a flexible shaft operating handle at the end of the pull rod fork joint 15. The flexible shaft operating handle is placed in the cab. The handle can be operated in the cab to make the pull rod fork joint 15 drive the lifting lock rotating shaft 10 to rotate, and the lifting lock rotating shaft 10 drives the rotating lock block 11 to disengage from the sliding lock block 12. After the hydraulic cylinder 6 drives the lower pad 7 to move downward, the torsion spring 14 is used to push the lock sleeve 13 to rotate, thereby driving the lifting lock rotating shaft 10 to rotate to realize the reset of the rotating lock block 11. When the hydraulic cylinder 6 drives the lower pad 7 to move upward, the lower pad 7 drives the sliding lock block 12 to move upward and contact the rotating lock block 11 to realize automatic locking; At the same time, before the lower pad 7 moves downward, the rotating lock block 11 and the sliding lock block 12 need to be unlocked. First, the flexible shaft joystick is operated to make the pull rod fork joint 15 drive the lifting lock shaft 10 to rotate, and the lifting lock shaft 10 drives the rotating lock block 11 to disengage from the sliding lock block 12, and then the hydraulic cylinder 6 drives the lower pad 7 to move downward.

[0025] Limit bolts 16 cooperating with the lock sleeve 13 are fixedly installed on the side plates 1 on both sides of the lifting lock shaft 10 close to the torsion spring 14. The limit bolts 16 can be used to limit the rotation angle of the lock sleeve 13. The rotating lock block 11 is fixedly connected to the lifting lock shaft 10 with an elastic cylindrical pin, which can ensure that the sliding lock block 12 and the rotating lock block 11 are automatically locked.

[0026] A reinforced protective cover 17 is provided on the outside of the rotating lock block 11, and the reinforced protective cover 17 is fixedly mounted on the corresponding side plate 1 and the hydraulic cylinder 6. The sliding lock block 12 extends into the reinforced protective cover 17 and cooperates with the rotating lock block 11. The reinforced protective cover 17 can be used to prevent weeds or straw from penetrating into the sliding lock block 12 and the rotating lock block 11, and can also enhance the connection strength between the hydraulic cylinder 6 and the side plate 1.

[0027] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific implementation examples described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A tractor trailer, characterized in that: It includes a base fixedly mounted on the rear axle box of the tractor, with a left cylinder mounting seat and a right cylinder mounting seat symmetrically mounted on both sides of the base, an upper pull rod mounting seat fixedly mounted on the upper end of the base, a driving structure obliquely mounted on one end of the base away from the rear axle box of the tractor, a towing structure connected to the lower end of the driving structure, and an auxiliary automatic locking structure installed between the towing structure and the base.

2. A tractor trailer according to claim 1, characterized in that: The base includes two parallel side plates, one end of the two side plates is fixedly mounted on the tractor rear axle box, the left cylinder mounting seat and the right cylinder mounting seat are both fixedly mounted on the side of the corresponding side plate close to the tractor rear axle box, a vertical plate is fixedly mounted between the two side plates, the vertical plate is located between the left cylinder mounting seat and the right cylinder mounting seat, a through hole is provided on the vertical plate below the upper pull rod fixing seat, and the driving structure is fixedly mounted on one end of the two side plates away from the tractor rear axle box.

3. A tractor towing device according to claim 2, characterized in that: The driving structure comprises two hydraulic cylinders parallel to each other, the two hydraulic cylinders are fixedly mounted on the two side plates respectively, and the towing structure is fixedly mounted on the protruding ends of the two hydraulic cylinders.

4. A tractor towing device according to claim 3, characterized in that: The towing structure includes a lower pad fixedly mounted on the protruding ends of the two hydraulic cylinders and arranged horizontally, a towing hook is fixedly mounted on the middle part of one end of the lower pad away from the vertical plate, and an upper pressure plate matching the towing hook is fixedly mounted on the cylinder barrels of the two hydraulic cylinders.

5. A tractor-mounted towing device according to claim 4, characterized in that: A limiting plate is provided between the upper pressing plate and the lower pad, and the limiting plate is fixedly mounted on an end of the upper pressing plate away from the towing hook.

6. A tractor trailer according to claim 4, characterized in that: The auxiliary automatic locking structure includes a lifting lock shaft rotatably installed on the two side panels, and both ends of the lifting lock shaft pass through the two side panels and are fixedly installed with rotating lock blocks, and a sliding lock block matching the rotating lock block is fixedly installed on the lower pad, and a locking sleeve is fixedly installed on one end of the lifting lock shaft between the two side panels, and a torsion spring is mounted on the lifting lock shaft between the locking sleeve and the adjacent side panels, and the torsion spring matches the locking sleeve, and a pull rod fork joint is hingedly installed on the locking sleeve for driving the lifting lock shaft to rotate, and a soft shaft operating structure is connected to the end of the pull rod fork joint.

7. A tractor-mounted towing device according to claim 6, characterized in that: Limit bolts matching with the lock sleeve are fixedly mounted on the side plates at both sides of the lifting lock rotating shaft close to the torsion spring.

8. A tractor-mounted towing device according to claim 6, characterized in that: A reinforced protective cover is arranged on the outer side of the rotating lock block, and the reinforced protective cover is fixedly mounted on the corresponding side plate and the hydraulic cylinder, and the sliding lock block extends into the reinforced protective cover to cooperate with the rotating lock block.

9. A tractor-mounted towing device according to claim 4, characterized in that: An included angle is arranged between the hydraulic cylinder and the lower pad, and the included angle is set to be 75°-85°.

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