Trailing device for tractor

Abstract

The utility model 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 which are used for three-point suspension are symmetrically mounted on two sides of the base, an upper pull rod fixing seat is fixedly mounted at the upper end of the base, and an upper pull rod is mounted on the upper pull rod fixing seat. 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 utility model relates to the technical field of automobile parts, and specifically relates to a towing device for tractor. BACKGROUND

[0002] Tractor comes from the Latin trahere, which means "pull". It is a device used to pull and tow other devices that cannot move by themselves. In the field of agriculture, it is called "all-purpose machine", so the towing device is an important part of it, which is used to pull agricultural machinery or trailers for plowing, harvesting and other operations.

[0003] In the prior art, the towing device is installed on the tractor, and the towing rod on the trailer or agricultural implement (hereinafter referred to as trailer) is provided with a traction hole. The traction hole of the trailer is pulled to the U-shaped hook of the towing device, so that the traction hole is inserted into the towing pin hole of the towing device after aligning, and then the connection between the trailer and the tractor can be realized. The existing towing device is mainly fixed U-shaped hook and adjustable U-shaped hook with sliding guide groove, and the height of the U-shaped hook needs to meet the requirements of the vehicle departure angle, so the ground clearance of the U-shaped hook of the towing device usually needs to be adjusted. The adjustable U-shaped hook with guide groove is provided with sliding guide grooves on both sides of the fixed plate, and the sliding guide grooves are provided with fixed pitch pin holes. In this way, the ground clearance of the U-shaped hook of the towing device can be adjusted by manpower as needed to complete the proper connection with the trailer. SUMMARY

[0004] For the problems existing in the prior art, the towing device for tractor provided by the utility model can drive the towing hook to move downward by cooperating the hydraulic cylinder with the lower pad plate, which facilitates 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, so that the towing rod can be lifted upward without additional lifting equipment or manpower, which can effectively improve the connection efficiency between the trailer and the tractor.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A towing device for tractor, comprising a base fixedly installed on the rear axle box of the tractor, left and right oil cylinder mounting seats (for installing three-point suspension) symmetrically installed on both sides of the base, an upper pull rod fixing seat fixedly installed on the upper end of the base, a driving structure obliquely installed at 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 the towing structure and the two bases can realize auxiliary automatic locking and unlocking.

[0007] Preferably, the base includes two side plates parallel to each other, one end of the two side plates is fixedly mounted on the rear axle box of the tractor, 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 rear axle box of the tractor, 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 mounting seat to install the power output shaft, and the drive structure is fixedly mounted on one end of the two side plates away from the rear axle box of the tractor.

[0008] Preferably, the driving structure includes two hydraulic cylinders parallel to each other, the two hydraulic cylinders are correspondingly installed on the two side plates, the two protruding ends of the two hydraulic cylinders are fixedly connected in parallel through a lower pad, and the towing hook is fixedly installed on the lower pad.

[0009] 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.

[0010] 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.

[0011] Preferably, the auxiliary locking structure includes a lifting lock shaft rotatably installed on the two side panels, and rotating lock blocks are fixedly installed at both ends of the lifting lock shaft through the two side panels respectively, and a sliding lock block cooperating with the rotating lock block is fixedly installed on the lower pad. 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 cooperates with the locking sleeve. A pull rod fork joint for driving the lifting lock shaft to rotate is hingedly installed on the locking sleeve, and the end of the pull rod fork joint is connected to a soft shaft for operation in the cab.

[0012] 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.

[0013] Preferably, a reinforced protective cover is provided on the outer side of the rotating locking block, and the reinforced protective cover is fixedly mounted on the corresponding side plate and the hydraulic cylinder, and the sliding locking block extends into the reinforced protective cover to cooperate with the rotating locking block.

[0014] Preferably, an angle is provided between the hydraulic cylinder and the lower pad, and the angle is set to be 75° to 85°.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1、 the utility model discloses a hydraulic cylinder is cooperated with lower tie plate can drive tow hook to go down, facilitate the connection of tow hook and tow car's drawbar, utilize hydraulic cylinder and can complete the lifting of tow car's drawbar, need not relevant hoisting equipment or manpower to go up drawbar, can effectively improve the installation efficiency between tow car and tractor;

[0017] 2、 the utility model discloses the design of hydraulic cylinder, through hydraulic cylinder and push lower tie plate to go down, through to lower tie plate and increase support, utilize reaction force and can complete the lifting of tractor rear axle, convenient for the adjustment of tractor rear wheel's track, can effectively reduce the adjustment difficulty of rear wheel track;

[0018] 3、 the utility model discloses hydraulic cylinder adopts the design of inclination, makes tow hook complete the movement to tractor rear in the process of going down, makes the space between tractor rear mounting structure and tow car drawbar, also increases the range of vision of driver in cab, is favorable to the adjustment of tow hook position of driver, makes the connection between tow car and tractor more simple and convenient;

[0019] 4、 the utility model discloses through the cooperation of sliding lock block and rotary lock block, can support the output end of hydraulic cylinder, can effectively avoid the safety accident of hydraulic cylinder due to pressure relief.

[0020] 5、 the utility model discloses be equipped with the reinforced protective cover, fixedly connected on both side plates and hydraulic cylinder, increase the strength of this structure, can effectively avoid the in-depth of grass or straw in labor operation, and do not tend to affect the use of self-locking structure. SHEET REFERENCE

[0021] Figure 1 It is the overall structure schematic diagram of a tractor towed device of the utility model;

[0022] Figure 2 It is the left view of a tractor towed device of the utility model;

[0023] Figure 3 It is the schematic diagram of the rotary lock block of a tractor towed device of the utility model;

[0024] Figure 4 It is the schematic diagram of the sliding lock block of a tractor towed device of the utility model.

[0025] In the drawing: 1-side plate, 2-stand, 3-left cylinder mounting seat, 4-right cylinder mounting seat, 5-upper pull rod fixed seat, 6-hydraulic cylinder, 7-lower tie plate, 8-tow hook, 9-upper pressing plate, 10-lifting lock pivot, 11-rotary lock block, 12-sliding lock block, 13-lock sleeve, 14-torsional spring, 15-pull rod fork joint, 16-limit bolt, 17-reinforced protective cover, 18-limiting plate. DETAILED DESCRIPTION

[0026] For the convenience of those skilled in the art to understand, the utility model is further explained below in combination with the drawings.

[0027] As Figures 1-4 The utility model provides a tractor towed device, including the base fixedly installed on the tractor rear axle box, the base both sides symmetry install left oil cylinder mounting seat 3 and right oil cylinder mounting seat 4, the base upper end fixedly installed have upper pull rod fixed seat 5, the base end away from the tractor rear axle box is obliquely installed with drive structure, drive structure lower end is connected with towed structure, drive structure adopts oblique design, makes towed structure lower displacement while moving forward, makes other structures of tractor rear axle installation and trailer between the reservation space, increases the range of vision of driver, facilitates the adjustment of driver to tow hook 8 position, easily realizes the connection between trailer and tractor, install auxiliary automatic locking structure between towed structure and base.

[0028] The base includes two parallel side plates 1, one end of the two side plates 1 is fixedly installed on the tractor rear axle box, the left oil cylinder mounting seat 3 and the right oil cylinder mounting seat 4 are fixedly installed on the side of the corresponding side plate 1 close to the tractor rear axle box, the left oil cylinder mounting seat 3 and the right oil cylinder mounting seat 4 are used for installing lifting oil cylinders and connecting rods, the connecting rods installed on the left oil cylinder mounting seat 3 and the right oil cylinder mounting seat 4 and the upper pull rod installed on the upper pull rod fixed seat 5 constitute a three-point suspension for trailer installation, a vertical plate 2 is fixedly installed between the two side plates 1, the upper pull rod fixed seat 5 is fixedly installed on the upper end of the vertical plate 2, the vertical plate 2 is located between the left oil cylinder mounting seat 3 and the right oil cylinder mounting seat 4, and the vertical plate 2 serves as the support of the side plate 1 of the left oil cylinder mounting seat 3 and the side plate 1 of the right oil cylinder mounting seat 4, so that the structural strength of the left oil cylinder mounting seat 3 and the right oil cylinder mounting seat 4 and the strength of the tractor towed device can be effectively improved, and the through hole provided on the vertical plate 2 below the upper pull rod fixed seat 5 is used for not affecting the installation and use of the power output shaft, and the drive structure is fixedly installed on the end of the two side plates 1 away from the tractor rear axle box.

[0029] The drive structure includes two parallel hydraulic oil cylinders 6, the two hydraulic oil cylinders 6 are fixedly installed on the two side plates 1, and the extension ends of the two hydraulic oil cylinders 6 are obliquely downwardly movable, the towed structure is fixedly installed on the extension ends of the two hydraulic oil cylinders 6, the up-down movement of the towed structure is pushed by the hydraulic oil cylinders 6, the towed structure is supported, the tractor rear axle can be lifted by using the reaction force, the adjustment of the wheel track of the tractor rear wheel is facilitated, the adjustment difficulty of the wheel track of the rear wheel is effectively reduced, and the work efficiency can be significantly improved.

[0030] 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 part of the end of the lower pad 7 away from the vertical plate 2. An upper pressure plate 9 that cooperates with the towing hook 8 is fixedly mounted on the cylinder barrels of the two hydraulic cylinders 6. The towing hook 8 cooperates with the upper pressure plate 9 to prevent the towing hook 8 from being separated from the trailer's tow bar.

[0031] 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.

[0032] The auxiliary automatic locking structure includes a lifting lock shaft 10 rotatably mounted on the two side panels 1, and two ends of the lifting lock shaft 10 pass through the two side panels 1 and are fixedly mounted with rotating lock blocks 11, and a sliding lock block 12 that cooperates with 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 panels 1, and the torsion spring 14 cooperates with the locking sleeve 13, and a locking sleeve 13 is hingedly mounted on the locking sleeve 13 for driving the lifting lock The shaft 10 rotates the pull rod fork joint 15, and the end of the pull rod fork joint 15 is connected to a soft shaft operating handle. The soft 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 shaft 10 to rotate, and the lifting lock 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, and then drives the lifting lock 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 with the rotating lock block 11 to realize automatic locking;

[0033] At the same time, before the lower plate 7 moves downward, the rotating lock block 11 and the sliding lock block 12 must be released. 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 plate 7 to move downward.

[0034] Limiting bolts 16 cooperating with the locking sleeve 13 are fixedly installed on the side plates 1 on both sides of the lifting lock shaft 10 near the torsion spring 14. The limiting bolts 16 can limit the rotation angle of the locking 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.

[0035] The rotating lock block 11 is provided with a reinforcing protective cover 17 which is fixedly installed on the corresponding side plate 1 and hydraulic oil cylinder 6, and the sliding lock block 12 extends into the reinforcing protective cover 17 and cooperates with the rotating lock block 11, so that the reinforcing protective cover 17 can avoid the deep influence of weeds or straws on the cooperation between the sliding lock block 12 and the rotating lock block 11, and can also enhance the connecting strength between the hydraulic oil cylinder 6 and the side plate 1.

[0036] The above is only an example and description of the structure of the present application, and those skilled in the art can make various modifications or supplements or use similar methods to replace the described specific embodiments, as long as they do not deviate from the structure of the present application or exceed the scope defined by the present application, which shall belong to the protection scope of the present application.

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 mounting seat, and the drive structure is fixedly mounted on one end of the two side plates away from the tractor rear axle box.

3. A tractor trailer according to claim 2, characterized in that: The driving structure includes 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 trailer 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 cooperating with the towing hook is fixedly mounted on the cylinder barrels of the two hydraulic cylinders.

5. A tractor trailer 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 rotating lock blocks are fixedly installed at both ends of the lifting lock shaft through the two side panels, and a sliding lock block cooperating with the rotating lock block is fixedly installed on the lower pad. 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. The torsion spring cooperates with the locking sleeve, and a pull rod fork joint for driving the lifting lock shaft to rotate is hingedly installed on the locking sleeve, and a soft shaft operating structure is connected to the end of the pull rod fork joint.

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

8. The tractor trailer according to claim 6, wherein: A reinforced protective cover is provided on the outer side of the rotating locking block, and the reinforced protective cover is fixedly mounted on the corresponding side plate and the hydraulic cylinder. The sliding locking block extends into the reinforced protective cover and cooperates with the rotating locking block.

9. The tractor trailer according to claim 4, wherein: An included angle is provided between the hydraulic cylinder and the lower pad, and the included angle is set to 75°-85°.

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