Electro-hydraulic leveling suspension system for crawler tractor in hilly and mountainous areas

Abstract

The utility model relates to an electro-hydraulic leveling suspension system for a hilly and mountain crawler tractor, which comprises a crawler tractor and a leveling suspension assembly arranged at the rear end of the crawler tractor and used for being connected with a suspension farm tool, the leveling suspension assembly comprises a mounting frame and a quick-change frame positioned behind the mounting frame, and an upper pull rod is hinged between the mounting frame and the quick-change frame; a lifting arm is rotationally arranged on the mounting frame, two lifting plates are symmetrically arranged on the lifting arm, two connecting parts are symmetrically arranged on the mounting frame, a lifting oil cylinder is hinged between the connecting part and the lifting plate on the same side, a lower pull rod is hinged between the connecting part and the quick change frame, and a leveling oil cylinder is hinged between one lower pull rod and the lifting plate on the same side; a lifting rod is hinged between the other lower pull rod and the lifting plate on the same side, and a limiting rod is hinged between the lower pull rod and the mounting frame. The relative angle between the quick-change frame and the set datum plane can be controlled by adjusting the telescopic amount of the leveling oil cylinder.

Description

Technical Field

[0001] This utility model relates to the field of tractor suspension system technology, and in particular to an electro-hydraulic leveling suspension system for a tracked tractor in hilly terrain. Background Technology

[0002] my country's hilly and mountainous terrain, with its undulating landscape, narrow and rugged roads, and fragmented fields, significantly limits mechanized operations. When tracked tractors operate on slopes, the uneven terrain causes the tractor chassis to tilt from side to side. Since suspended implements are typically connected to the tracked tractor via a three-point suspension system and are relatively fixed in position, they also tilt along with the tractor. This can easily cause one end of the implemented implement to strike the ground, affecting not only the quality of work but also posing a safety hazard.

[0003] Currently, the three-point suspension system of tracked tractors can be easily leveled by manually adjusting the left and right lift rods. However, when operating in hilly and mountainous terrain with complex terrain, manual leveling is time-consuming and laborious, and cannot be leveled in real time. Utility Model Content

[0004] In view of the problems existing in the prior art, this utility model provides an electro-hydraulic leveling suspension system for tracked tractors in hilly and mountainous areas.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: an electro-hydraulic leveling suspension system for a tracked tractor in hilly and mountainous areas, including a tracked tractor and a leveling suspension assembly disposed at the rear end of the tracked tractor for connection with suspended implements. The leveling suspension assembly includes a mounting frame and a quick-change frame located behind the mounting frame. An upper pull rod is hinged between the mounting frame and the quick-change frame. A lifting arm is rotatably disposed on the mounting frame. Two lifting plates are symmetrically disposed on the lifting arm. Two connecting parts are symmetrically disposed on the mounting frame. A lifting cylinder is hinged between the connecting part on the same side and the lifting plate. A lower pull rod is hinged between the connecting part and the quick-change frame. A leveling cylinder is hinged between one lower pull rod and the lifting plate on the same side. A lifting rod is hinged between the other lower pull rod and the lifting plate on the same side. A limiting rod is hinged between the lower pull rod and the mounting frame.

[0006] As a preferred embodiment, the quick-change frame is equipped with an angle sensor and is used to connect to suspended agricultural implements.

[0007] As a preferred embodiment, the system also includes a leveling hydraulic system connected to the leveling cylinder. The leveling hydraulic system is installed on the tracked tractor and includes a hydraulic tank, a suction filter, a pump, a three-position four-way electro-proportional directional valve, a dual-hydraulic control check valve, and a return filter. The pump's inlet is connected to the hydraulic tank via the suction filter. The inlet P of the three-position four-way electro-proportional directional valve is connected to the pump's outlet via a hydraulic pipe. The outlet T of the three-position four-way electro-proportional directional valve is connected to the inlet of the return filter. The outlet of the return filter is connected to the hydraulic tank via a hydraulic pipe. The working port A of the three-position four-way electro-proportional directional valve is connected to the rodless chamber of the leveling cylinder via the dual-hydraulic control check valve, and the working port B of the three-position four-way electro-proportional directional valve is connected to the rod chamber of the leveling cylinder via the dual-hydraulic control check valve.

[0008] As a preferred embodiment, the leveling hydraulic system also includes a safety valve, the inlet of which is connected to the outlet of the oil pump, and the outlet of which is connected to the inlet of the return oil filter.

[0009] As a preferred embodiment, one end of the lifting cylinder is hinged to the connecting part, and the other end is hinged to the middle of the lifting plate.

[0010] As a preferred embodiment, the connecting part is located at the lower end of the mounting frame, and the lifting arm is located at the upper end of the mounting frame.

[0011] As a preferred embodiment, the mounting bracket is provided with a connecting plate between the two connecting parts, and the two ends of the limiting rod are respectively hinged to the connecting plate and the pull rod.

[0012] The beneficial effects of this application are as follows: 1. This application can control the relative angle between the quick-change frame and the set reference plane by adjusting the extension and retraction of the leveling cylinder. The system realizes that when the tracked tractor tilts, the suspended implements are adjusted in real time to keep parallel to the set reference plane, ensuring that the working depth of the suspended implements is uniform, the working quality is high, and the work efficiency is improved.

[0013] 2. This application adopts a three-position four-way proportional directional valve, which can not only change the direction of the oil circuit to control the extension and retraction of the leveling cylinder, but also adjust the speed of the extension and retraction of the leveling cylinder by controlling the input electrical signal; thus ensuring the precise control of the leveling suspension system when changing different suspension implements. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the leveling suspension assembly of this utility model;

[0016] Figure 3 This is a schematic diagram of the leveling hydraulic system of this utility model.

[0017] The markings in the diagram are: 1. Tracked tractor; 11. Mounting frame; 111. Connecting part; 112. Connecting plate; 2. Leveling hydraulic system; 21. Hydraulic oil tank; 22. Suction filter element; 23. Oil pump; 24. Safety valve; 25. Electro-proportional valve / directional valve; 26. Dual-hydraulic control check valve; 27. Return oil filter; 3. Leveling suspension assembly; 31. Lifting arm; 311. Lifting plate; 32. Lifting rod; 33. Upper pull rod; 34. Quick change frame; 35. Limit rod; 36. Lower pull rod; 37. Leveling cylinder; 38. Lifting cylinder. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] Please see Figure 1-3 This utility model provides an electro-hydraulic leveling suspension system for a tracked tractor in hilly terrain, including a tracked tractor 1 and a leveling suspension assembly 3 located at the rear end of the tracked tractor 1 for connection with suspended implements. The leveling suspension assembly 3 includes a mounting frame 11 and a quick-change frame 34 located behind the mounting frame 11. An upper pull rod 33 is hinged between the mounting frame 11 and the quick-change frame 34. A lifting arm 31 is rotatably mounted on the mounting frame 11. Two lifting plates 311 are symmetrically mounted on the lifting arm 31. Two connecting parts 111 are symmetrically mounted on the mounting frame 11. A lifting cylinder 38 is hinged between the connecting part 111 and the lifting plate 311 on the same side. A lower pull rod 36 is hinged between the connecting part 111 and the quick-change frame 34. One lower pull rod 36 is hinged to the lifting plate 311 on the same side and is equipped with a leveling cylinder 37. The other lower pull rod 36 is hinged to the lifting plate 311 on the same side and is equipped with a lifting rod 32. A limiting rod 35 is hinged between the lower pull rod 36 and the mounting frame 11.

[0020] The quick-change frame 34 is equipped with an angle sensor and is used to connect to the suspended agricultural implements.

[0021] Specifically, it also includes a leveling hydraulic system 2 connected to the leveling cylinder 37. The leveling hydraulic system 2 is installed on the tracked tractor 1. The leveling hydraulic system 2 includes a hydraulic oil tank 21, a suction filter element 22, an oil pump 23, a safety valve 24, a three-position four-way proportional directional valve 25, a dual-hydraulic control check valve 26, and a return oil filter 27. The oil inlet of the oil pump 23 is connected to the hydraulic oil tank 21 via the suction filter element 22. The oil inlet P of the three-position four-way proportional directional valve 25 is connected to the hydraulic oil tank 21 via the suction filter element 22. The oil pump 23's outlet is connected to the oil pipe. The outlet T of the three-position four-way proportional directional valve 25 is connected to the inlet of the return oil filter 27. The outlet of the return oil filter 27 is connected to the hydraulic oil tank 21 via a hydraulic oil pipe. The working port A of the three-position four-way proportional directional valve 25 is connected to the rodless chamber of the leveling cylinder 37 via a double-hydraulic-controlled check valve 26. The working port B of the three-position four-way proportional directional valve 25 is connected to the rod chamber of the leveling cylinder 37 via a double-hydraulic-controlled check valve 26. The safety valve 24's inlet is connected to the oil pump 23's outlet, and the safety valve 24's outlet is connected to the return oil filter 27's inlet. It should be noted that any parts not detailed in this application are prior art.

[0022] More specifically, one end of the lifting cylinder 38 is hinged to the connecting part 111, and the other end is hinged to the middle of the lifting plate 311. The connecting part 111 is located at the lower end of the mounting frame 11, and the lifting arm 31 is located at the upper end of the mounting frame 11. A connecting plate 112 is provided on the mounting frame 11 between the two connecting parts 111, and the two ends of the limiting rod 35 are hinged to the connecting plate 112 and the pull rod 36, respectively.

[0023] Furthermore, the lifting arm 31 is fixed to the rear end of the mounting frame 11 of the tracked tractor 1 by a bushing, and the lifting arm 31 can rotate relative to the mounting frame 11; the leveling cylinder 37 is set on one side of the leveling suspension system 3, and the two ends of the leveling cylinder 37 are respectively connected to the pull rod 36 and the lifting plate 311 on the same side by pins; the lifting rod 32 is set on the other side of the leveling suspension system 3, and the two ends of the lifting rod 32 are respectively connected to the pull rod 36 and the lifting plate 311 on the same side by pins; the two pull rods 36 are set on both sides of the mounting frame 11, and the two ends of the pull rods 36 are respectively hinged to the connecting part 111 and the quick change frame 34 by pins; the quick change frame 34 adopts a three-point suspension to attach to the suspended implements; the upper pull rod 33 is set in the middle and upper part of the leveling suspension system 3, and the two ends of the upper pull rod 33 are respectively hinged to the mounting frame 11 and the quick change frame 34 by pins.

[0024] When the three-position four-way proportional directional valve 25 is not energized, the valve core is in the middle position. At this time, the oil pump 23 draws oil through the hydraulic oil tank 21 and the suction filter element 22, and the hydraulic oil flows through the electro-proportional directional valve 24 into the return oil filter 27 and then into the hydraulic oil tank 21. When one side coil is energized, the valve opening of the three-position four-way proportional directional valve 25 is proportional to the input electrical signal, thereby controlling the pressure oil flow rate in that direction. At this time, the hydraulic oil of the oil pump 23 flows through the three-position four-way proportional directional valve 25 into the leveling cylinder 37 and acts on the quick-change frame 34, causing the quick-change frame 34 to undergo a corresponding angle change; the reverse is also true.

[0025] This application enables the control of the relative angle between the quick-change frame 34 and the set reference plane by adjusting the extension and retraction of the leveling cylinder 37. This system ensures that when the tracked tractor 1 tilts, the suspended implements are kept parallel to the set reference plane in real time, guaranteeing uniform working depth, high working quality, and improved work efficiency. The extension and retraction of the leveling cylinder 37 are controlled by the three-position four-way proportional directional valve 25, achieving automatic leveling.

[0026] Of course, this utility model is not limited to the embodiments described above. Several other embodiments based on the design concept of this utility model are also provided below.

[0027] For example, in other embodiments, unlike the embodiments described above, a control unit is also included. The control unit includes a PLC controller, which is electrically connected to the oil pump 23, the lifting cylinder 38, the three-position four-way proportional directional valve 25, and the tilt sensor.

[0028] It should be noted that the above embodiments are only used to illustrate the present utility model, but the present utility model is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An electro-hydraulic leveling suspension system for a tracked tractor in hilly terrain, characterized in that, The system includes a tracked tractor (1) and a leveling suspension assembly (3) located at the rear end of the tracked tractor (1) for connection with suspended implements. The leveling suspension assembly (3) includes a mounting frame (11) and a quick-change frame (34) located behind the mounting frame (11). An upper tie rod (33) is hinged between the mounting frame (11) and the quick-change frame (34). A lifting arm (31) is rotatably mounted on the mounting frame (11). Two lifting plates (311) are symmetrically mounted on the lifting arm (31). Two connecting parts are symmetrically mounted on the mounting frame (11). A lifting cylinder (38) is hinged between the connecting part (111) and the lifting plate (311) on the same side. A pull rod (36) is hinged between the connecting part (111) and the quick change frame (34). One of the pull rods (36) is hinged to the lifting plate (311) on the same side and is equipped with a leveling cylinder (37). The other pull rod (36) is hinged to the lifting plate (311) on the same side and is equipped with a lifting rod (32). A limit rod (35) is hinged between the pull rod (36) and the mounting frame (11).

2. The electro-hydraulic leveling suspension system for a tracked tractor in hilly terrain according to claim 1, characterized in that: The quick-change frame (34) is equipped with an angle sensor and is used to connect with suspended agricultural implements.

3. The electro-hydraulic leveling suspension system for a tracked tractor in hilly terrain according to claim 1, characterized in that: It also includes a leveling hydraulic system (2) connected to the leveling cylinder (37). The leveling hydraulic system (2) is installed on the tracked tractor (1). The leveling hydraulic system (2) includes a hydraulic oil tank (21), a suction filter element (22), an oil pump (23), a three-position four-way proportional directional valve (25), a dual-hydraulic control check valve (26), and a return oil filter (27). The oil inlet of the oil pump (23) is connected to the hydraulic oil tank (21) through the suction filter element (22). The oil inlet P of the three-position four-way proportional directional valve (25) is connected to the hydraulic oil pipe. The oil outlet T of the three-position four-way proportional directional valve (25) is connected to the oil outlet of the return oil filter (27), and the oil outlet of the return oil filter (27) is connected to the hydraulic oil tank (21) through the hydraulic oil pipe; the working port A of the three-position four-way proportional directional valve (25) is connected to the rodless chamber of the leveling cylinder (37) through the double hydraulic check valve (26), and the working port B of the three-position four-way proportional directional valve (25) is connected to the rod chamber of the leveling cylinder (37) through the double hydraulic check valve (26).

4. The electro-hydraulic leveling suspension system for a tracked tractor in hilly terrain according to claim 3, characterized in that: The leveling hydraulic system (2) also includes a safety valve (24), the inlet of which is connected to the outlet of the oil pump (23), and the outlet of which is connected to the inlet of the return oil filter (27).

5. The electro-hydraulic leveling suspension system for a tracked tractor in hilly terrain according to claim 1, characterized in that: One end of the lifting cylinder (38) is hinged to the connecting part (111), and the other end is hinged to the middle of the lifting plate (311).

6. The electro-hydraulic leveling suspension system for a tracked tractor in hilly terrain according to claim 1, characterized in that: The connecting part (111) is located at the lower end of the mounting frame (11), and the lifting arm (31) is located at the upper end of the mounting frame (11).

7. The electro-hydraulic leveling suspension system for a tracked tractor in hilly terrain according to claim 1, characterized in that: The mounting bracket (11) has a connecting plate (112) located between the two connecting parts (111), and the two ends of the limiting rod (35) are hinged to the connecting plate (112) and the pull rod (36) respectively.

Images