Hydraulic system for steering of header of harvester

Abstract

The hydraulic system comprises a working hydraulic system and a steering hydraulic system of the header, the working hydraulic system comprises a working oil cylinder, a plurality of oil ways and a first electromagnetic directional valve, and the steering hydraulic system comprises a three-position seven-way electromagnetic valve, a first steering oil cylinder and a second steering oil cylinder. The three-position seven-way electromagnetic valve comprises a first inlet, a second inlet, a third inlet, a fourth inlet, a first outlet, a second outlet, a third outlet and a fourth outlet, the first inlet is connected with the first oil way, the first oil way is connected with the first electromagnetic reversing valve, the second inlet is connected with the second oil way, the second oil way is connected with the hydraulic source, and the third inlet is connected with the third oil way; the third oil way is connected with the oil return tank, the fourth inlet is connected with the fourth oil way, the fourth oil way is connected with the oil return tank, and the first outlet is connected with the first oil way.

Description

Technical Field

[0001] The utility model relates to a hydraulic system for steering a harvester cutting platform. Background Art

[0002] Harvester is a machine that harvests crops in one go. It completes harvesting and threshing at one time, and collects the grains into storage bins, and then transports the grains to transport vehicles through conveyor belts. It can also be harvested manually, and the straw of crops such as rice and wheat is spread in the field, and then picked up and threshed by grain harvesters. Crop harvesting machinery that harvests grains and straw of cereal crops such as rice and wheat. It includes harvesters, reapers, balers, grain combine harvesters and grain threshers. Grain harvesters are developed on the basis of various harvesting and threshing tools.

[0003] The oil return of the steering part of the header steering valve of the existing structure overlaps with the system oil circuit. Under the influence of the system hydraulic oil, the steering oil return is blocked and the return speed of the steering cylinder is slow. Utility Model Content

[0004] The utility model aims to solve the above-mentioned deficiencies in the prior art and provides a hydraulic system for steering a harvester header.

[0005] A hydraulic system for steering a harvester header, comprising a working hydraulic system and a steering hydraulic system of the header, wherein the working hydraulic system comprises a working oil cylinder, a plurality of oil circuits and a first electromagnetic reversing valve, the steering hydraulic system comprises a three-position seven-way electromagnetic valve, a first steering oil cylinder, and a second steering oil cylinder, and the three-position seven-way electromagnetic valve comprises a first inlet, a second inlet, a third inlet, a fourth inlet, a first outlet, a second outlet, a third outlet, and a fourth outlet,

[0006] The first inlet is connected to the first oil circuit, the first oil circuit is connected to the first electromagnetic reversing valve, the second inlet is connected to the second oil circuit, the second oil circuit is connected to the hydraulic source, the third inlet is connected to the third oil circuit, the third oil circuit is connected to the oil return tank, the fourth inlet is connected to the fourth oil circuit, the fourth oil circuit is connected to the oil return tank, the first outlet is connected to the first oil circuit, the fifth oil circuit is connected to the rodless chamber of the first steering cylinder, the second outlet is connected to the sixth oil circuit, the sixth oil circuit is connected to the rodless chamber of the second steering cylinder, the third outlet is connected to the seventh oil circuit, and the seventh oil circuit is connected to the rodless chamber of the second steering cylinder;

[0007] The three-position seven-way solenoid valve includes the first position, the second position and the third position;

[0008] First station: the first inlet is closed, the second inlet is connected to the first outlet, the third inlet is connected to the second outlet, and the third outlet is closed;

[0009] Second station: the first inlet, the fourth inlet are connected to the third outlet, and a throttle valve is provided on the oil line at the third outlet, the second inlet is closed, and the third inlet is connected to the first outlet and the second outlet;

[0010] The third station: the first inlet is closed, the second inlet is connected to the second outlet, and the third inlet is connected to the first outlet.

[0011] Preferably, the first oil circuit, the third oil circuit and the fourth oil circuit are connected via an eighth oil circuit, and an overflow valve is provided on the eighth oil circuit.

[0012] Preferably, the first electromagnetic reversing valve is a three-position five-way electromagnetic valve, which includes a first inlet, a second inlet, a third inlet, a first outlet, and a second outlet.

[0013] The first inlet is connected to the oil return tank through the ninth oil circuit, the second inlet is connected to the hydraulic source through the tenth oil circuit, the third inlet is connected to the first oil circuit, the first outlet is connected to the first working oil cylinder through the eleventh oil circuit, the eleventh oil circuit is also connected to the twelfth oil circuit, the twelfth oil circuit is connected to the second working oil cylinder, the second outlet is connected to the thirteenth oil circuit, the thirteenth oil circuit is connected to the fourteenth oil circuit, both ends of the fourteenth oil circuit are respectively connected to two one-way valves, and the two one-way valves are respectively located on the eleventh oil circuit and the twelfth oil circuit;

[0014] The three-position five-way solenoid valve includes the first position, the second position and the third position;

[0015] First station: the first inlet is connected to the second outlet, the second inlet is connected to the first outlet, and the third inlet is closed;

[0016] Second station: the first inlet is connected to the second outlet, and a throttle valve is provided on the oil line between the first inlet and the second outlet, the second inlet is connected to the third inlet, and the first outlet is closed;

[0017] The third workstation: the first inlet is connected to the first outlet, the second inlet is connected to the second outlet, and the third inlet is closed.

[0018] Preferably, a pressure reducing valve is provided on the second oil circuit, the pressure reducing valve is connected to the eighth oil circuit, and the second oil circuit is connected to the oil return tank through the fourth oil circuit.

[0019] Beneficial effect: Compared with the prior art, the utility model optimizes the steering oil return part of the valve body through a newly designed three-position seven-way solenoid valve, isolates the steering main return oil from the valve main oil circuit, avoids obstruction of the steering oil return, and accelerates the return speed of the steering cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the principle of a hydraulic system for steering a harvester header;

[0021] In the figure, 1, working hydraulic system, 2, steering hydraulic system, 3, three-position seven-way solenoid valve, 4, three-position five-way solenoid valve, 5, first oil circuit, 6, second oil circuit, 7, third oil circuit, 8, fourth oil circuit, 9, fifth oil circuit, 10, sixth oil circuit, 11, seventh oil circuit, 12, eighth oil circuit, 13, ninth oil circuit, 14, tenth oil circuit, 15, eleventh oil circuit, 16, twelfth oil circuit, 17, thirteenth oil circuit, 18, fourteenth oil circuit, 19, first steering cylinder, 20, second steering cylinder, 21, first working cylinder, 22, second working cylinder, 23, pressure reducing valve, 24, overflow valve, 25, one-way valve. DETAILED DESCRIPTION

[0022] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0023] like Figure 1 As shown, a working hydraulic system 1, a steering hydraulic system 2, a three-position seven-way solenoid valve 3, a three-position five-way solenoid valve 4, a first oil circuit 5, a second oil circuit 6, a third oil circuit 7, a fourth oil circuit 8, a fifth oil circuit 9, a sixth oil circuit 10, a seventh oil circuit 11, an eighth oil circuit 12, a ninth oil circuit 13, a tenth oil circuit 14, an eleventh oil circuit 15, a twelfth oil circuit 16, a thirteenth oil circuit 17, a fourteenth oil circuit 18, a first steering cylinder 19, a second steering cylinder 20, a first working cylinder 21, a second working cylinder 22, a pressure reducing valve 23, a relief valve 24, and a one-way valve 25;

[0024] A hydraulic system for steering a harvester header, comprising a working hydraulic system 1 and a steering hydraulic system 2 of the header, wherein the working hydraulic system 1 comprises a working oil cylinder, a plurality of oil circuits and a first electromagnetic reversing valve, and the steering hydraulic system 2 comprises a three-position seven-way electromagnetic valve 3, a first steering oil cylinder 19, and a second steering oil cylinder 20, and the three-position seven-way electromagnetic valve 3 comprises a first inlet, a second inlet, a third inlet, a fourth inlet, a first outlet, a second outlet, a third outlet, and a fourth outlet,

[0025] The first inlet is connected to the first oil circuit 5, the first oil circuit 5 is connected to the first electromagnetic reversing valve, the second inlet is connected to the second oil circuit 6, the second oil circuit 6 is connected to the hydraulic source, the third inlet is connected to the third oil circuit 7, the third oil circuit 7 is connected to the oil return tank, the fourth inlet is connected to the fourth oil circuit 8, the fourth oil circuit 8 is connected to the oil return tank, the first outlet is connected to the first oil circuit 5, the fifth oil circuit 9 is connected to the rodless chamber of the first steering cylinder 19, the second outlet is connected to the sixth oil circuit 10, the sixth oil circuit 10 is connected to the rodless chamber of the second steering cylinder 20, the third outlet is connected to the seventh oil circuit 11, the seventh oil circuit 11 is connected to the rodless chamber of the second steering cylinder 20;

[0026] The three-position seven-way solenoid valve 3 includes a first station, a second station, and a third station;

[0027] First station: the first inlet is closed, the second inlet is connected to the first outlet, the third inlet is connected to the second outlet, and the third outlet is closed;

[0028] Second station: the first inlet, the fourth inlet are connected to the third outlet, and a throttle valve is provided on the oil line at the third outlet, the second inlet is closed, and the third inlet is connected to the first outlet and the second outlet;

[0029] The third station: the first inlet is closed, the second inlet is connected to the second outlet, and the third inlet is connected to the first outlet.

[0030] In this embodiment, the first oil circuit 5 , the third oil circuit 7 , and the fourth oil circuit 8 are connected via the eighth oil circuit 12 , and a relief valve 24 is disposed on the eighth oil circuit 12 .

[0031] In this embodiment, the first electromagnetic reversing valve is a three-position five-way electromagnetic valve 4, and the three-position five-way electromagnetic valve 4 includes a first inlet, a second inlet, a third inlet, a first outlet, and a second outlet.

[0032] The first inlet is connected to the oil return tank through the ninth oil passage 13, the second inlet is connected to the hydraulic source through the tenth oil passage 14, the third inlet is connected to the first oil passage 5, the first outlet is connected to the first working oil cylinder 21 through the eleventh oil passage 15, the eleventh oil passage 15 is also connected to the twelfth oil passage 16, the twelfth oil passage 16 is connected to the second working oil cylinder 22, the second outlet is connected to the thirteenth oil passage 17, the thirteenth oil passage 17 is connected to the fourteenth oil passage 18, both ends of the fourteenth oil passage 18 are respectively connected to two one-way valves 25, and the two one-way valves 25 are respectively located on the eleventh oil passage 15 and the twelfth oil passage 16;

[0033] The three-position five-way solenoid valve 4 includes a first station, a second station, and a third station;

[0034] First station: the first inlet is connected to the second outlet, the second inlet is connected to the first outlet, and the third inlet is closed;

[0035] Second station: the first inlet is connected to the second outlet, and a throttle valve is provided on the oil line between the first inlet and the second outlet, the second inlet is connected to the third inlet, and the first outlet is closed;

[0036] The third workstation: the first inlet is connected to the first outlet, the second inlet is connected to the second outlet, and the third inlet is closed.

[0037] In this embodiment, a pressure reducing valve 23 is provided on the second oil circuit 6 , the pressure reducing valve 23 is connected to the eighth oil circuit 12 , and the second oil circuit 6 is connected to the oil return tank through the fourth oil circuit 8 .

[0038] For details on the flow direction of the hydraulic oil in the solenoid valve and the specific oil path, see Figure 1 .

[0039] 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 hydraulic system for steering a harvester header, characterized in that: It includes a working hydraulic system and a steering hydraulic system of a cutting platform, wherein the working hydraulic system includes a working oil cylinder, a plurality of oil circuits and a first electromagnetic reversing valve, wherein the steering hydraulic system includes a three-position seven-way electromagnetic valve, a first steering oil cylinder, and a second steering oil cylinder, wherein the three-position seven-way electromagnetic valve includes a first inlet, a second inlet, a third inlet, a fourth inlet, a first outlet, a second outlet, a third outlet, and a fourth outlet, The first inlet is connected to the first oil circuit, the first oil circuit is connected to the first electromagnetic reversing valve, the second inlet is connected to the second oil circuit, the second oil circuit is connected to the hydraulic source, the third inlet is connected to the third oil circuit, the third oil circuit is connected to the oil return tank, the fourth inlet is connected to the fourth oil circuit, the fourth oil circuit is connected to the oil return tank, the first outlet is connected to the fifth oil circuit, the fifth oil circuit is connected to the rodless chamber of the first steering cylinder, the second outlet is connected to the sixth oil circuit, the sixth oil circuit is connected to the rodless chamber of the second steering cylinder, the third outlet is connected to the seventh oil circuit, the seventh oil circuit is connected to the rodless chamber of the second steering cylinder; The three-position seven-way solenoid valve comprises a first station, a second station and a third station; The first station: the first inlet is closed, the second inlet is connected to the first outlet, the third inlet is connected to the second outlet, and the third outlet is closed; The second station: the first inlet, the fourth inlet are connected to the third outlet, and a throttle valve is provided on the oil circuit at the third outlet, the second inlet is closed, and the third inlet is connected to the first outlet and the second outlet; The third workstation: the first inlet is closed, the second inlet is connected to the second outlet, and the third inlet is connected to the first outlet.

2. A hydraulic system for steering a harvester header according to claim 1, characterized in that: The first oil circuit, the third oil circuit and the fourth oil circuit are connected through an eighth oil circuit, and an overflow valve is provided on the eighth oil circuit.

3. A hydraulic system for steering a harvester header according to claim 2, characterized in that: The first electromagnetic reversing valve is a three-position five-way electromagnetic valve, which includes a first inlet, a second inlet, a third inlet, a first outlet, and a second outlet. The first inlet is connected to the oil return tank through the ninth oil circuit, the second inlet is connected to the hydraulic source through the tenth oil circuit, the third inlet is connected to the first oil circuit, the first outlet is connected to the first working oil cylinder through the eleventh oil circuit, the eleventh oil circuit is also connected to the twelfth oil circuit, the twelfth oil circuit is connected to the second working oil cylinder, the second outlet is connected to the thirteenth oil circuit, the thirteenth oil circuit is connected to the fourteenth oil circuit, both ends of the fourteenth oil circuit are respectively connected to two one-way valves, and the two one-way valves are respectively located on the eleventh oil circuit and the twelfth oil circuit; The three-position five-way solenoid valve comprises a first station, a second station and a third station; First station: the first inlet is connected to the second outlet, the second inlet is connected to the first outlet, and the third inlet is closed; Second station: the first inlet is connected to the second outlet, and a throttle valve is provided on the oil line between the first inlet and the second outlet, the second inlet is connected to the third inlet, and the first outlet is closed; The third workstation: the first inlet is connected to the first outlet, the second inlet is connected to the second outlet, and the third inlet is closed.

4. A hydraulic system for steering a harvester header according to claim 3, characterized in that: The second oil circuit is provided with a pressure reducing valve, which is connected to the eighth oil circuit. The second oil circuit is connected to the oil return tank through the fourth oil circuit.

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