Power reversing hydraulic device of wheeled tractor

Abstract

The utility model provides a power reversing hydraulic device of a wheeled tractor, which comprises a tractor body, a reversing box body and a controller, one end of a first hydraulic cylinder is hinged to a seat, the other end of the first hydraulic cylinder is hinged to the tractor body, and a liquid storage tank is communicated with an upper end cavity of the first hydraulic cylinder through a first hydraulic pipe. A cavity in the lower end of the first hydraulic cylinder is connected with a hydraulic energy accumulator through a third hydraulic pipe, the hydraulic energy accumulator is connected with a reversing valve through a fourth hydraulic pipe, the reversing valve is connected to the second hydraulic cylinder through a fifth hydraulic pipe and a sixth hydraulic pipe, a shifting rod is arranged in the reversing box in a sliding mode, a reversing handle is arranged on the shifting rod, and a fixing plate is rotationally arranged on the shifting rod. One end of the fixing plate is connected with the telescopic end of the second hydraulic rod, the other end of the fixing plate extends out of the sliding groove, the travel switches are oppositely arranged at the two ends of the sliding groove, the operation direction of the reversing handle is judged through the travel switches, the second hydraulic cylinder assists the reversing handle, operation force of the reversing handle is reduced, labor intensity is relieved, and the reversing speed is increased. And the tractor is more flexible during field operation.

Description

Technical Field

[0001] The utility model relates to the technical field of power reversing, in particular to a power reversing hydraulic device for a wheeled tractor. Background Art

[0002] In agricultural production, tractors are a type of agricultural machinery that is often used to pull and drive various farm implements for farmland operations, such as plowing, sowing, and harvesting. Tractors have greatly improved the efficiency of agricultural production and reduced the labor intensity of farmers through their powerful power system and flexible maneuverability. Wheeled tractors are a type of tractor. Their main feature is that they use wheels as moving parts. Compared with crawler tractors, wheeled tractors have higher driving speeds and better road adaptability. They can move quickly on roads and are convenient for transfer between different fields. In addition, the structure of wheeled tractors is relatively simple, and the cost of the whole machine and maintenance is low, so they have been widely used in agricultural production.

[0003] Wheeled tractors are used in a wide range of scenarios. In farmland operations, they can tow various farm implements such as seeders, harvesters, and plows to complete tasks such as sowing, harvesting, and tillage. Due to the complex terrain of farmland and uneven roads, tractors need to change direction frequently during driving. Traditional mechanical reversing devices are cumbersome to operate and inefficient. In the prior art, the power reversing hydraulic device of a wheeled tractor has the following problems: the traditional power reversing system has a complex mechanical structure, requiring the driver to manually reverse the direction through an operating handle. The operating force of the operating handle is large. Due to the limitations of the mechanical structure, the operating handle also has a certain operating stroke. The tractor needs to frequently change direction when working in the field, which increases the labor intensity. Utility Model Content

[0004] In view of this, the utility model proposes a power reversing hydraulic device for a wheeled tractor to solve the above problems raised in the background technology.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A power reversing hydraulic device for a wheeled tractor comprises a vehicle body, a reversing box and a controller, wherein the reversing box is arranged at the front part of the vehicle bottom, a seat is arranged at the top surface of the rear part of the vehicle body, one end of the seat is hinged to the vehicle body, and the other end thereof is hinged to the telescopic end of a first hydraulic cylinder, the bottom of the first hydraulic cylinder is hinged to the top of the vehicle body, a liquid storage tank is arranged on the top of the vehicle body, the liquid storage tank is communicated with the upper end cavity of the first hydraulic cylinder through a first hydraulic pipe, the lower end cavity of the first hydraulic cylinder is connected to a hydraulic accumulator through a third hydraulic pipe, a one-way valve is arranged on the third hydraulic pipe, the hydraulic accumulator is connected to a reversing valve through a fourth hydraulic pipe, and the reversing valve is connected to a second hydraulic accumulator through a fifth hydraulic pipe. The reversing valve is connected to the cavity 2 of the second hydraulic cylinder through the sixth hydraulic pipe. The second hydraulic cylinder is arranged on the inner wall of the reversing box. A shift rod is slidably provided in the reversing box. A reversing handle is provided on the side wall of the shift rod. A reversing groove is provided on the top of the reversing box. A slide groove is provided on the side of the reversing box. The reversing handle is slidably provided in the reversing groove. A fixed plate is rotatably provided on the shift rod. One end of the fixed plate is connected to the telescopic end of the first hydraulic rod, and the other end extends out of the slide groove and is slidably connected to the slide groove. Travel switches are relatively provided at both ends of the slide groove. The travel switch is arranged on the outer wall of the reversing box. The controller is arranged on the top surface of the front part of the vehicle body and is electrically connected to the travel switch and the reversing valve.

[0007] Preferably, the hydraulic accumulator includes an inflation valve, an airbag and a shell, the inflation valve is arranged on the top of the shell, the airbag is arranged inside the shell, the inflation valve is communicated with the airbag, and the shell is installed on the top surface of the rear part of the vehicle body.

[0008] Preferably, it further includes a second hydraulic pipe, the liquid storage tank is connected to the lower end cavity of the first hydraulic cylinder through the second hydraulic pipe, and the second hydraulic pipe is provided with a pressure relief valve.

[0009] Preferably, the first hydraulic cylinder includes a piston rod, a piston, a one-way valve and a hydraulic cylinder, wherein one end of the piston rod away from the hydraulic cylinder is hinged to the seat, and the other end is connected to the top surface of the piston, the piston is slidably arranged in the hydraulic cylinder, the one-way valve is arranged on the piston, the water inlet of the one-way valve is located on the top surface of the piston, and the water outlet is located on the bottom surface of the piston, and the bottom of the hydraulic cylinder is hinged to the top surface of the vehicle body.

[0010] Preferably, the second hydraulic cylinder includes a piston rod, a piston and a hydraulic cylinder, wherein one end of the piston rod away from the hydraulic cylinder is connected to a fixed plate, and the other end is connected to a top surface of the piston, the piston is slidably disposed in the hydraulic cylinder, and the bottom of the hydraulic cylinder is fixed to the inner wall of the reversing box.

[0011] Preferably, the horizontal height of the bottom of the liquid storage tank is greater than the height of the upper end cavity of the first hydraulic cylinder.

[0012] Preferably, it also includes a forward gear slot and a reverse gear slot, wherein the forward gear slot is located at the front end side of the reversing slot and are interconnected, and the reverse gear slot is located at the rear end side of the reversing slot and are interconnected.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] ① The power reversing device used in wheeled tractors is equipped with a hydraulic cylinder on the seat. The kinetic energy of the vibration generated by the wheeled tractor during driving is converted into hydraulic energy and stored in a hydraulic accumulator. The operating direction of the reversing handle is determined by the travel switch, and the second hydraulic cylinder assists the reversing handle, thereby reducing the operating force of the reversing handle, reducing labor intensity, and increasing the reversing speed, making the tractor more flexible when operating in the field;

[0015] ② A pressure relief circulation pipeline is provided on the first hydraulic cylinder, so that the hydraulic cylinder has a damping effect. When the tractor generates vibration during driving, the kinetic energy is absorbed by the hydraulic cylinder, thereby reducing the bumpiness of the seat and increasing the comfort of the seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a three-dimensional structural schematic diagram of a power reversing hydraulic device of a wheeled tractor of the utility model;

[0018] Figure 2 It is a cross-sectional structural schematic diagram of a power reversing hydraulic device of a wheeled tractor of the utility model;

[0019] Figure 3 for Figure 2 Cross-section at AA in the middle;

[0020] Figure 4 for Figure 2 Cross-section at the middle BB;

[0021] Figure 5 for Figure 2 Sectional view at CC;

[0022] Figure numerals: 1. body; 2. seat; 3. first hydraulic cylinder; 4. fluid storage tank; 5. first hydraulic pipe; 6. second hydraulic pipe; 7. pressure relief valve; 8. first piston rod; 9. first piston; 10. one-way valve; 11. third hydraulic pipe; 12. air bag; 13. accumulator housing; 14. fourth hydraulic pipe; 15. reversing valve; 16. fifth hydraulic pipe; 17. sixth hydraulic pipe; 18. reversing box; 19. reversing handle; 20. lever; 21. fixing plate; 22. second piston rod; 23. second piston; 24. second hydraulic cylinder; 25. slide groove; 26. reversing groove; 27. travel switch; 28. controller; 29. ​​transmission; 30. engine; 31. forward gear slot; 32. reverse gear slot; 33. charging valve. DETAILED DESCRIPTION

[0023] In order to better understand the technical content of the present invention, a specific embodiment is provided below, and the present invention is further described in conjunction with the accompanying drawings.

[0024] See also Figures 1 to 5 The utility model provides a power reversing hydraulic device for a wheeled tractor, comprising a vehicle body 1, a reversing box 18 and a controller 28, wherein the reversing box 18 is arranged at the front part of the bottom of the vehicle, a seat 2 is arranged on the top surface of the rear part of the vehicle body 1, one end of the seat 2 is hinged to the vehicle body 1, and the other end thereof is hinged to the telescopic end of the first hydraulic cylinder 3, the bottom of the first hydraulic cylinder 3 is hinged to the top of the vehicle body 1, a liquid storage tank 4 is arranged on the top of the vehicle body 1, the liquid storage tank 4 is communicated with the upper end cavity of the first hydraulic cylinder 3 through a first hydraulic pipe 5, the lower end cavity of the first hydraulic cylinder 3 is connected to a hydraulic accumulator through a third hydraulic pipe 11, the hydraulic accumulator is installed on the top surface of the rear part of the bottom of the vehicle 1, a one-way valve 10 is arranged on the third hydraulic pipe 11, the hydraulic accumulator is connected to a reversing valve 15 through a fourth hydraulic pipe 14, the reversing valve 15 adopts a two-position two-way model, and the reversing valve 15 is connected to a second hydraulic cylinder 24 through a fifth hydraulic pipe 16 The reversing valve 15 is connected to the cavity 2 of the second hydraulic cylinder 24 through the sixth hydraulic pipe 17. The second hydraulic cylinder 24 is arranged on the inner wall of the reversing box 18. A lever 20 is slidably provided in the reversing box 18. A reversing handle 19 is provided on the side wall of the lever 20. A reversing groove 26 is provided on the top of the reversing box 18. A slide groove 25 is provided on the side of the reversing box 18. The reversing handle 19 is slidably provided in the reversing groove 26. A fixed plate 21 is rotatably provided on the lever 20. One end of the fixed plate 21 is connected to the telescopic end of the first hydraulic rod, and the other end extends out of the slide groove 25 and is slidably connected to the slide groove 25. Travel switches 27 are arranged at both ends of the slide groove 25. The travel switch 27 is arranged on the outer wall of the reversing box 18. The controller 28 is arranged on the top surface of the front part of the vehicle body 1 and is electrically connected to the travel switch 27 and the reversing valve 15. A transmission 29 and an engine 30 are arranged in front of the lever 20.

[0025] Before starting the wheeled tractor, it is first necessary to add brake fluid to the fluid storage tank 4, and the brake fluid flows into the upper end cavity of the first hydraulic cylinder 3 through the first hydraulic pipe 5. Then the wheeled tractor is started. When the tractor is running, the uneven road surface generates vibration, and the seat 2 drives the telescopic end of the first hydraulic cylinder 3 to vibrate up and down. When the telescopic end of the first hydraulic cylinder 3 is shortened, the brake fluid in the lower end cavity of the first hydraulic cylinder 3 is squeezed and flows into the hydraulic accumulator through the third hydraulic pipe 11. The hydraulic accumulator converts the vibration kinetic energy of the seat 2 into compression energy and stores it. When the tractor moves forward, the reversing handle 19 is located at the front end of the reversing groove 26. At this time, the fixed plate 21 squeezes the contact of the travel switch 27. When the tractor needs to reverse, the reversing handle 19 is manually pushed backward. At this time, the lever 20 drives the fixed plate 21 to move along the slide groove 25. The fixed plate 21 and the contact of the travel switch 27 are separated. The travel switch 27 transmits the signal to the controller 28 through the wire. The controller 28 controls the reversing valve 15 to connect the fourth hydraulic pipe 14 and the sixth hydraulic pipe 17. The shortening of the telescopic end of the second hydraulic cylinder 24 drives the fixed plate 21 to move. The movement of the fixed plate 21 drives the lever 20 to move, thereby reducing the operating force of the reversing handle 19 and increasing the speed of the reversing operation. The reversing handle 19 moves to the rear end of the reversing groove 26. When the side of the fixed plate 21 squeezes the contact of another travel switch 27, the travel switch 27 transmits the signal to the controller 28 through the wire. The controller 28 controls the reversing valve 15 to disconnect the fourth hydraulic pipe 14 and the sixth hydraulic pipe 17, that is, the auxiliary operation of converting the forward gear to the reverse gear is completed. force; when the tractor is reversing, the reversing handle 19 is located at the rear end of the reversing groove 26, and the fixed plate 21 squeezes the contact of the travel switch 27. When the tractor needs to move forward, the reversing handle 19 is manually moved forward, and the lever 20 drives the fixed plate 21 to move along the slide groove 25, and the fixed plate 21 and the contact of the travel switch 27 are separated. The travel switch 27 transmits the signal to the controller 28 through the wire, and the controller 28 controls the reversing valve 15 to connect the fourth hydraulic pipe 14 and the fifth hydraulic pipe 16, and the second hydraulic cylinder 2 The extension of the telescopic end of the tractor 4 drives the fixed plate 21 to move, and the movement of the fixed plate 21 drives the lever 20 to move, thereby reducing the operating force of the reversing handle 19 and increasing the speed of the reversing operation. The reversing handle 19 moves to the front end of the reversing groove 26. When the side of the fixed plate 21 squeezes the contact of the travel switch 27, the travel switch 27 transmits the signal to the controller 28 through the wire. The controller 28 controls the reversing valve 15 to disconnect the fourth hydraulic pipe 14 and the fifth hydraulic pipe 16, that is, the power assist of switching from the reverse gear to the forward gear is completed. The power reversing hydraulic device generates power assist during reversing, assisting the reversing handle 19 to complete the reversing operation, which not only reduces the labor intensity, but also increases the reversing speed, making the tractor more flexible when working in the field.

[0026] Preferably, the hydraulic accumulator includes an inflation valve 33, an airbag 12 and a shell, wherein the inflation valve 33 is arranged on the top of the shell, the airbag 12 is arranged inside the shell, the inflation valve 33 is communicated with the airbag 12, and the shell is installed on the top surface of the rear part of the vehicle body 1.

[0027] When the power reversing hydraulic device works normally, helium needs to be filled into the airbag 12 in the shell through the inflation valve 33 first. When the brake fluid is pressed into the shell by the first hydraulic cylinder 3 through the third hydraulic pipe 11, the brake fluid will squeeze the airbag 12, causing the airbag 12 to shrink continuously and store the compression energy of the helium.

[0028] Preferably, it further comprises a second hydraulic pipe 6 , the liquid storage tank 4 is connected to the lower end cavity of the first hydraulic cylinder 3 through the second hydraulic pipe 6 , and a pressure relief valve 7 is provided on the second hydraulic pipe 6 .

[0029] When the power reversing hydraulic device works normally, after the energy storage pressure of the hydraulic accumulator reaches a certain value, the pressure relief valve 7 on the second hydraulic pipe 6 will open, and when the seat 2 drives the telescopic end of the first hydraulic cylinder 3 to vibrate up and down, when the telescopic end of the first hydraulic cylinder 3 is shortened, the brake fluid in the lower end cavity of the first hydraulic cylinder 3 is squeezed and flows back into the fluid storage tank 4 through the second hydraulic pipe 6. The first hydraulic cylinder 3 has a damping effect. When the tractor vibrates during driving, the kinetic energy is absorbed by the hydraulic cylinder, thereby reducing the bumps of the seat 2 and increasing the comfort of the seat 2.

[0030] Preferably, the first hydraulic cylinder 3 includes a piston rod, a piston, a one-way valve 10 and a hydraulic cylinder, wherein one end of the piston rod away from the hydraulic cylinder is hinged to the seat 2, and the other end is connected to the top surface of the piston, the piston is slidably arranged in the hydraulic cylinder, the one-way valve 10 is arranged on the piston, the water inlet of the one-way valve 10 is located on the top surface of the piston, and the water outlet is located on the bottom surface of the piston, and the bottom of the hydraulic cylinder is hinged to the top surface of the vehicle body 1.

[0031] When the tractor is driving, the seat 2 drives the piston rod to move up and down, and the piston rod drives the piston to slide in the hydraulic cylinder. When the seat 2 drives the piston rod to move downward, the piston rod moves downward and drives the piston to move downward, the brake fluid in the lower end cavity of the first hydraulic cylinder 3 is compressed by the piston, and the brake fluid flows into the hydraulic accumulator through the third hydraulic pipe 11, and at the same time, the brake fluid flows from the reservoir 4 through the first hydraulic pipe 5 into the upper end cavity of the first hydraulic cylinder 3; when the seat 2 drives the piston rod to move upward, the piston rod moves upward and drives the piston to move upward, the brake fluid in the upper end cavity of the first hydraulic cylinder 3 is compressed by the piston, and the brake fluid is squeezed and flows into the lower end cavity of the first hydraulic cylinder 3 through the one-way valve 10 on the piston.

[0032] Preferably, the second hydraulic cylinder 24 includes a piston rod, a piston and a hydraulic cylinder, wherein one end of the piston rod away from the hydraulic cylinder is connected to the fixed plate 21, and the other end is connected to the top surface of the piston, the piston is slidably arranged in the hydraulic cylinder, and the bottom of the hydraulic cylinder is fixed to the inner wall of the reversing box 18.

[0033] When the reversing handle 19 moves from front to back, the reversing valve 15 connects the fourth hydraulic pipe 14 and the sixth hydraulic pipe 17, and the brake fluid flows into the cavity of the second hydraulic cylinder 24 and pushes the piston to slide backward in the hydraulic cylinder. The backward sliding of the piston drives the piston rod to move backward, and the backward movement of the piston rod drives the fixed plate 21 to move backward, and the backward movement of the fixed plate 21 drives the lever 20 to move, thereby reducing the operating force of the reversing handle 19; when the reversing handle 19 moves from back to front, the reversing valve 15 connects the fourth hydraulic pipe 14 and the fifth hydraulic pipe 16, and the brake fluid flows into the cavity of the second hydraulic cylinder 24 and pushes the piston to slide forward in the hydraulic cylinder. The forward sliding of the piston drives the piston rod to move forward, and the forward movement of the piston rod drives the fixed plate 21 to move forward, and the forward movement of the fixed plate 21 drives the lever 20 to move, thereby reducing the operating force of the reversing handle 19.

[0034] Preferably, the horizontal height of the bottom of the liquid storage tank 4 is greater than the height of the upper cavity of the first hydraulic cylinder 3 .

[0035] The bottom level of the fluid storage tank 4 is greater than the upper cavity height of the first hydraulic cylinder 3 . The brake fluid in the fluid storage tank 4 can flow into the first hydraulic cylinder 3 through the first hydraulic pipe 5 under the action of gravity, thereby ensuring the replenishment of the brake fluid.

[0036] Preferably, it further includes a forward gear slot 31 and a reverse gear slot 32 , wherein the forward gear slot 31 is located at the front end side of the reversing slot 26 and are interconnected, and the reverse gear slot 32 is located at the rear end side of the reversing slot 26 and are interconnected.

[0037] When the tractor is in the forward state, the reversing handle 19 is located at the front end of the reversing groove 26, and the reversing handle 19 can be rotated around the lever 20 and inserted into the forward gear groove 31; similarly, when the tractor is in the reverse state, the reversing handle 19 is located at the rear end of the reversing groove 26, and the reversing handle 19 can be rotated around the lever 20 and inserted into the reverse gear groove 32; when the reversing handle 19 is located in the forward gear groove 31 and the reverse gear groove 32, because it is restricted, it can prevent accidental touching, resulting in abnormal reversing of the reversing handle 19.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A power reversing hydraulic device for a wheeled tractor, characterized in that: It includes a vehicle body, a reversing box and a controller, the reversing box is arranged at the front part of the bottom of the vehicle, a seat is arranged on the top surface of the rear part of the vehicle body, one end of the seat is hinged to the vehicle body, and the other end thereof is hinged to the telescopic end of the first hydraulic cylinder, the bottom of the first hydraulic cylinder is hinged to the top of the vehicle body, a liquid storage tank is arranged on the top of the vehicle body, the liquid storage tank is connected with the upper end cavity of the first hydraulic cylinder through a first hydraulic pipe, the lower end cavity of the first hydraulic cylinder is connected with a hydraulic accumulator through a third hydraulic pipe, a one-way valve is arranged on the third hydraulic pipe, the hydraulic accumulator is connected with a reversing valve through a fourth hydraulic pipe, the reversing valve is connected with a cavity of the second hydraulic cylinder through a fifth hydraulic pipe, and the reversing valve is connected with a cavity of the second hydraulic cylinder through a fifth hydraulic pipe. The directional valve is connected to cavity 2 of the second hydraulic cylinder through a sixth hydraulic pipe. The second hydraulic cylinder is arranged on the inner wall of the reversing box. A shift rod is slidably provided in the reversing box. A reversing handle is provided on the side wall of the shift rod. A reversing groove is provided on the top of the reversing box. A slide groove is provided on the side of the reversing box. The reversing handle is slidably provided in the reversing groove. A fixed plate is rotatably provided on the shift rod. One end of the fixed plate is connected to the telescopic end of the first hydraulic rod, and the other end extends out of the slide groove and is slidably connected to the slide groove. Travel switches are relatively provided at both ends of the slide groove. The travel switch is arranged on the outer wall of the reversing box. The controller is arranged on the top surface of the front part of the vehicle body and is electrically connected to the travel switch and the reversing valve.

2. A power reversing hydraulic device for a wheeled tractor according to claim 1, characterized in that: The hydraulic accumulator comprises an inflation valve, an airbag and a shell, wherein the inflation valve is arranged on the top of the shell, the airbag is arranged inside the shell, the inflation valve is communicated with the airbag, and the shell is installed on the top surface of the rear part of the vehicle body.

3. The power reversing hydraulic device for a wheeled tractor according to claim 1, characterized in that: It also includes a second hydraulic pipe, through which the liquid storage tank is connected to the lower end cavity of the first hydraulic cylinder, and a pressure relief valve is provided on the second hydraulic pipe.

4. A power reversing hydraulic device for a wheeled tractor according to claim 1, characterized in that: The first hydraulic cylinder includes a piston rod, a piston, a one-way valve and a hydraulic cylinder. The piston rod is hinged to the seat at one end away from the hydraulic cylinder, and the other end is connected to the top surface of the piston. The piston is slidably arranged in the hydraulic cylinder. The one-way valve is arranged on the piston. The water inlet of the one-way valve is located on the top surface of the piston, and the water outlet is located on the bottom surface of the piston. The bottom of the hydraulic cylinder is hinged to the top surface of the vehicle body.

5. The power reversing hydraulic device for a wheeled tractor according to claim 1, characterized in that: The second hydraulic cylinder includes a piston rod, a piston and a hydraulic cylinder. The piston rod is connected to a fixed plate at one end away from the hydraulic cylinder, and the other end is connected to the top surface of the piston. The piston is slidably arranged in the hydraulic cylinder, and the bottom of the hydraulic cylinder is fixed to the inner wall of the reversing box.

6. The power reversing hydraulic device for a wheeled tractor according to claim 1, characterized in that: The horizontal height of the bottom of the liquid storage tank is greater than the height of the upper end cavity of the first hydraulic cylinder.

7. The power reversing hydraulic device for a wheeled tractor according to claim 1, characterized in that: It also includes a forward gear slot and a reverse gear slot. The forward gear slot is located on the front end side of the reversing slot and is connected to each other, and the reverse gear slot is located on the rear end side of the reversing slot and is connected to each other.

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