Agricultural machine hydraulic system and agricultural machine

Abstract

The utility model belongs to the technical field of agricultural machinery, and discloses an agricultural machinery hydraulic system and agricultural machinery, in the agricultural machinery hydraulic system, no matter a first priority valve is located at a first position or a second position, a pump can supply oil to a steering gear all the time so as to ensure that hydraulic oil is supplied to the steering gear all the time and ensure that the steering gear can work; dangerous conditions are avoided; in addition, when the first priority valve is located at the second position, the pump supplies oil to the steering gear and other functional modules at the same time, by arranging the first control valve and the second control valve, the pump can only supply oil to one functional module, the situation that the multiple functional modules are shunted is avoided, and therefore when the pump supplies oil to one functional module, the pump can supply oil to the other functional modules. And the flow entering the functional module is large, so that the normal work of the functional module is ensured. The agricultural mechanical hydraulic system is only provided with one motor and one pump, and hydraulic oil supply to the steering gear and other functional modules can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery, in particular to a hydraulic system for agricultural machinery and an agricultural machinery. Background Art

[0002] Tractors are essential production tools in agricultural production. With the advancement of the new energy wave, different types of electric tractors have been introduced in the domestic and foreign agricultural machinery fields. Among them, operations such as steering, implement lifting, and hydraulic output of small-horsepower tractors usually need to be realized through a hydraulic system. Specifically, an electric motor drives a hydraulic pump to work, and relevant structures are driven by hydraulic oil to realize the above operations.

[0003] Generally speaking, the oil flow required for tractor steering is small, but it is necessary to ensure that hydraulic oil is always supplied to the steering system to ensure that the steering system can work and avoid dangerous situations. In addition, the oil flow required for implement lifting is large, and compared with other hydraulic output modules, hydraulic oil needs to be supplied to the implement lifting module as preferentially as possible. To meet the above requirements, the prior art provides an electro-hydraulic control system for an electric tractor, which uses two electric motors to drive two hydraulic pumps respectively for steering and implement operations, which can ensure that hydraulic oil is always supplied to the steering system and can provide sufficient hydraulic oil for the implement lifting module. However, this solution uses two electric motors and two hydraulic pumps, which not only increases the vehicle cost but also easily causes power waste. Summary of the Utility Model

[0004] According to one aspect of the utility model, the utility model provides a hydraulic system for agricultural machinery to solve the problems that the prior art uses a solution with two electric motors and two hydraulic pumps, resulting in a relatively high vehicle cost and easy power waste.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] The hydraulic system for agricultural machinery includes:

[0007] A fuel tank;

[0008] A pump having a pump input end and a pump output end, and the pump input end is connected to the fuel tank;

[0009] A first priority valve having a first inlet end, a first outlet end, and a second outlet end. The first inlet end is connected to the pump output end, the first outlet end is used for connecting to a steering gear, and the first priority valve has a first position and a second position. When the first priority valve is in the first position, the first inlet end is only communicated with the first outlet end. When the first priority valve is in the second position, the first inlet end is simultaneously communicated with the first outlet end and the second outlet end;

[0010] The first control valve has a first input end, a first output end and a second output end. The first input end can be connected to the first output end or the second output end. The first input end is connected to the second outlet end, and the first output end is used to connect to the first functional module;

[0011] The second control valve has a second input end, a third output end and a fourth output end. The second input end can be connected to the third output end or the fourth output end. The second input end is connected to the second output end, the third output end is used to connect to the second functional module, and the fourth output end is used to connect to the third functional module.

[0012] As a preferred solution of the hydraulic system of agricultural machinery, the third functional module is a hydraulic lifter.

[0013] As a preferred solution of the hydraulic system of agricultural machinery, the first control valve has a first output position and a first communication position. When the first control valve is in the first output position, the first input end is connected to the first output end; when the first control valve is in the first communication position, the first input end is connected to the second output end;

[0014] The second control valve has a second output position and a second communication position. When the second control valve is in the second output position, the second input end is connected to the third output end; when the second control valve is in the second communication position, the second input end is connected to the fourth output end.

[0015] As a preferred solution of the hydraulic system of agricultural machinery, the third control valve has a third input end, a fifth output end and a sixth output end. The third input end can be connected to the fifth output end or the sixth output end. The third input end is connected to the second output end, the sixth output end is connected to the second input end, and the fifth output end is used to connect to the fourth functional module.

[0016] The hydraulic system of agricultural machinery includes:

[0017] An oil tank;

[0018] A pump having a pump input end and a pump output end, and the pump input end is connected to the oil tank;

[0019] The first priority valve has a first inlet end, a first outlet end, and a second outlet end. The first inlet end is connected to the pump output end. The first outlet end is used to connect to the steering gear. The first priority valve has a first position and a second position. When the first priority valve is in the first position, the first inlet end is only in communication with the first outlet end. When the first priority valve is in the second position, the first inlet end is in communication with both the first outlet end and the second outlet end at the same time;

[0020] The second priority valve has a second inlet end, a third outlet end, and a fourth outlet end. The second inlet end is connected to the second outlet end. The third outlet end is connected to the hydraulic lift. The fourth outlet end is used to connect to the multi-way valve assembly. The second priority valve has a third position and a fourth position. When the second priority valve is in the third position, the second inlet end is only in communication with the third outlet end. When the second priority valve is in the fourth position, the second inlet end is in communication with both the third outlet end and the fourth outlet end at the same time.

[0021] As a preferred solution for the hydraulic system of agricultural machinery, the first priority valve further has a first adjustment end and a second adjustment end. The hydraulic fluid located at the first adjustment end can drive the first priority valve to move towards the second position. The hydraulic fluid located at the second adjustment end can drive the first priority valve to move towards the first position. The first adjustment end is in communication with the first outlet end. The second adjustment end is in communication with the control port of the steering gear. The first priority valve is connected with a first elastic member, and the first elastic member is used to provide an elastic force for moving the first priority valve towards the first position.

[0022] As a preferred solution for the hydraulic system of agricultural machinery, an oil supply line filter is further provided between the pump output end and the first inlet end.

[0023] As a preferred solution for the hydraulic system of agricultural machinery, it further includes an oil return line. The oil return line is connected to the fuel tank, and an oil return line filter is provided on the oil return line.

[0024] As a preferred solution for the hydraulic system of agricultural machinery, an oil return cooling device is further provided on the oil return line.

[0025] According to another aspect of the present invention, there is provided an agricultural machinery, including the above-mentioned hydraulic system of agricultural machinery, and further including a steering gear. The first outlet end of the first priority valve is connected to the steering gear.

[0026] The beneficial effects of the present invention are:

[0027] The utility model provides an agricultural machinery hydraulic system, which includes an oil tank, a pump, a first priority valve, a first control valve and a second control valve. The pump has a pump input end and a pump output end, and the pump input end is connected to the oil tank; the first priority valve has a first inlet end, a first outlet end and a second outlet end. The first inlet end is connected to the pump output end, and the first outlet end is used to connect to a steering gear. The first priority valve has a first position and a second position. When the first priority valve is in the first position, the first inlet end is only communicated with the first outlet end. When the first priority valve is in the second position, the first inlet end is simultaneously communicated with the first outlet end and the second outlet end. Thus, no matter whether the first priority valve is in the first position or the second position, the pump can always supply oil to the steering gear to ensure that there is always hydraulic oil supplied to the steering gear, ensuring that the steering gear can work and avoiding dangerous situations; in addition, when the first priority valve is in the second position, the pump supplies oil to the steering gear and other functional modules at the same time. The first control valve has a first input end, a first output end and a second output end. The first input end can be connected to the first output end or the second output end. The first input end is connected to the second outlet end, and the first output end is used to connect to a first functional module; the second control valve has a second input end, a third output end and a fourth output end. The second input end can be connected to the third output end or the fourth output end. The second input end is connected to the second output end, the third output end is used to connect to a second functional module, and the fourth output end is used to connect to a third functional module. That is to say, the oil supply circuits of the three functional modules are independent of each other. The pump can only supply oil to one of the functional modules, and there will be no situation of multiple functional modules sharing the flow, so that when the pump supplies oil to one of the functional modules, the flow rate entering the functional module is larger, ensuring that it can work properly. One of the functional modules can be set as a lifter of the agricultural machinery, so that the pump can only supply oil to the steering gear and the lifter, ensuring that the oil flow rates of the two can meet the requirements. The agricultural machinery hydraulic system is only provided with one motor and one pump, which can realize the supply of hydraulic oil to the steering gear and other functional modules. By setting the first priority valve, the pump can always supply oil to the steering gear. By setting the first control valve and the second control valve, the hydraulic oil can be supplied only to the first functional module, only to the second functional module or only to the third functional module, and different functional modules can be set according to actual needs.

[0028] The present utility model also provides another hydraulic system for agricultural machinery, which includes an oil tank, a pump, a first priority valve and a second priority valve. The pump has a pump input end and a pump output end, and the pump input end is connected to the oil tank. The first priority valve has a first inlet end, a first outlet end and a second outlet end. The first inlet end is connected to the pump output end, and the first outlet end is used to connect to a steering gear. The first priority valve has a first position and a second position. When the first priority valve is in the first position, the first inlet end is only connected to the first outlet end. When the first priority valve is in the second position, the first inlet end is simultaneously connected to the first outlet end and the second outlet end, so that no matter whether the first priority valve is in the first position or the second position, the pump can always supply oil to the steering gear to ensure that there is always hydraulic oil supplied to the steering gear, ensuring that the steering gear can work and avoiding dangerous situations. In addition, when the first priority valve is in the second position, the pump supplies oil to the steering gear and other functional modules simultaneously. The second priority valve has a second inlet end, a third outlet end and a fourth outlet end. The second inlet end is connected to the second outlet end, the third outlet end is connected to a hydraulic lifter, and the fourth outlet end is used to connect to a multi-way valve assembly. The second priority valve has a third position and a fourth position. When the second priority valve is in the third position, the second inlet end is only connected to the third outlet end. When the second priority valve is in the fourth position, the second inlet end is simultaneously connected to the third outlet end and the fourth outlet end, so that no matter whether the second priority valve is in the third position or the fourth position, as long as the first priority valve is in the second position, the pump can supply oil to the hydraulic lifter to ensure that the hydraulic oil is preferentially supplied to the hydraulic lifter, ensuring that the oil flow rate of the hydraulic lifter can meet the requirements. When the second priority valve is in the fourth position, the pump can supply oil to the hydraulic lifter and the multi-way valve assembly simultaneously to drive other hydraulic functional modules to work. This hydraulic system for agricultural machinery is only provided with one motor and one pump, which can realize the supply of hydraulic oil to the steering gear and other functional modules. By setting the first priority valve, the pump can always supply oil to the steering gear. By setting the second priority valve, the hydraulic oil can be preferentially supplied to the hydraulic lifter to meet the oil flow rate requirements of the hydraulic lifter.

[0029] The present utility model also provides an agricultural machinery, which includes the hydraulic system for agricultural machinery in any of the above solutions, and also includes a steering gear. The first outlet end of the first priority valve is connected to the steering gear. The above-mentioned hydraulic system for agricultural machinery is only provided with one motor and one pump, which can realize the supply of hydraulic oil to the steering gear and other functional modules, and can preferentially supply oil to the hydraulic lifter on the premise of meeting the flow rate requirements of the steering gear. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of the hydraulic system for agricultural machinery in Embodiment 1 of the present utility model;

[0031] Figure 2It is a partial structural schematic diagram of the hydraulic system of an agricultural machine in the first embodiment of the present utility model;

[0032] Figure 3 It is a structural schematic diagram of the hydraulic system of an agricultural machine in the second embodiment of the present utility model;

[0033] Figure 4 It is a partial structural schematic diagram of the hydraulic system of an agricultural machine in the second embodiment of the present utility model;

[0034] Figure 5 It is a structural schematic diagram of the hydraulic system of an agricultural machine in the third embodiment of the present utility model.

[0035] In the figure:

[0036] 100, steering gear; 101, control port; 110, steering cylinder; 200, hydraulic lifter;

[0037] 1, fuel tank;

[0038] 2, pump; 21, pump input end; 22, pump output end; 23, fuel supply line filter;

[0039] 3, first priority valve; 31, first inlet end; 32, first outlet end; 33, second outlet end; 34, first adjustment end; 35, second adjustment end; 36, first elastic member;

[0040] 4, first control valve; 41, first input end; 42, first output end; 43, second output end; 44, first oil return end; 45, third elastic member;

[0041] 5, second control valve; 51, second input end; 52, third output end; 53, fourth output end; 54, second oil return end; 55, fourth elastic member;

[0042] 6, third control valve; 61, third input end; 62, fifth output end; 63, sixth output end; 64, third oil return end; 65, fifth elastic member;

[0043] 7, second priority valve; 71, second inlet end; 72, third outlet end; 73, fourth outlet end; 74, third adjustment end; 75, fourth adjustment end; 76, second elastic member;

[0044] 8, oil return line; 81, oil return line filter; 82, oil return cooling device;

[0045] 9, overflow valve. Detailed implementation manners

[0046] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the accompanying drawings.

[0047] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0048] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and to the right", and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and to the left", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0049] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0050] Embodiment 1

[0051] The oil flow required for the steering of a tractor is relatively small, but it is necessary to ensure that hydraulic oil is always supplied to the steering system to ensure that the steering system can work and avoid dangerous situations. In addition, the oil flow required for the lifting of agricultural implements is relatively large, and compared with other hydraulic output modules, the hydraulic oil needs to be supplied to the agricultural implement lifting module as preferentially as possible. To meet the above requirements, the prior art provides an electro-hydraulic control system for an electric tractor, which uses two motors to drive two hydraulic pumps respectively for steering and agricultural implement operation, which can ensure that hydraulic oil is always supplied to the steering system and can provide sufficient hydraulic oil for the agricultural implement lifting module. However, this solution uses two motors and two hydraulic pumps, which not only increases the cost of the whole vehicle but also easily causes power waste.

[0052] In view of the above problems, the present embodiment provides a hydraulic system for agricultural machinery to solve the problems that the prior art uses a solution with two motors and two hydraulic pumps, resulting in a relatively high cost of the whole vehicle and easy power waste, and can be used in the technical field of agricultural machinery. In this embodiment, the agricultural machinery is a tillage machine, and in other embodiments, the agricultural machinery can also be a planting machine such as a seeding machine or a planting machine, or a harvesting machine such as a ear picker, or a machine such as a weeding machine.

[0053] Referring to Figure 1 - Figure 2 , the hydraulic system for agricultural machinery includes a fuel tank 1, a pump 2, and a first priority valve 3. The pump 2 has a pump input end 21 and a pump output end 22. The pump input end 21 is connected to the fuel tank 1. Herein, the pump 2 in this embodiment is a motor pump, and its impeller can rotate driven by a motor. In other embodiments, other types of pumps can also be used; the first priority valve 3 has a first inlet end 31, a first outlet end 32, and a second outlet end 33. The first inlet end 31 is connected to the pump output end 22. The first outlet end 32 is used to connect to a steering gear 100. Herein, the steering gear 100 is used to connect to a steering cylinder 110, and the steering cylinder 110 is used to drive the agricultural machinery to complete steering. The first priority valve 3 has a first position and a second position. When the first priority valve 3 is in the first position, the first inlet end 31 is only communicated with the first outlet end 32. When the first priority valve 3 is in the second position, the first inlet end 31 is simultaneously communicated with the first outlet end 32 and the second outlet end 33. Thus, no matter whether the first priority valve 3 is in the first position or the second position, the pump 2 can always supply oil to the steering gear 100 to ensure that hydraulic oil is always supplied to the steering gear 100, ensure that the steering gear 100 can work, and avoid dangerous situations; in addition, when the first priority valve 3 is in the second position, the pump 2 supplies oil to the steering gear 100 and other functional modules simultaneously.

[0054] Optionally, the first priority valve 3 is configured to preferentially move to the first position so that the first priority valve 3 preferentially supplies oil only to the steering gear 100.

[0055] Specifically, the first priority valve 3 further has a first adjustment end 34 and a second adjustment end 35. The hydraulic fluid located at the first adjustment end 34 can drive the first priority valve 3 to move towards the second position, and the hydraulic fluid located at the second adjustment end 35 can drive the first priority valve 3 to move towards the first position. The first adjustment end 34 communicates with the first outlet end 32, and the second adjustment end 35 communicates with the control port 101 of the steering gear 100; the first priority valve 3 is connected with a first elastic member 36, and the first elastic member 36 is used to provide an elastic force for making the first priority valve 3 move towards the first position. When the steering gear 100 does not work, no hydraulic fluid is output from the control port 101, and when the steering gear 100 works, a certain amount of hydraulic fluid is output from the control port 101. In the initial state, the first priority valve 3 is located at the first position under the action of the first elastic member 36.

[0056] Refer to Figure 1, the adjustment process of the first priority valve 3 is as follows: When the steering gear 100 is not working, the oil pressure at the control port 101 is zero, and the oil pressure at the second adjustment end 35 is zero. The oil fluid enters the first outlet end 32 through the first inlet end 31 and simultaneously enters the first adjustment end 34. As long as the oil pressure at the first adjustment end 34 can overcome the elastic force of the first elastic member 36, the first priority valve 3 can be pushed towards the second position. When the steering gear 100 is working, some oil fluid enters the second adjustment end 35. The first adjustment end 34 needs to have a relatively large oil pressure to simultaneously overcome the oil pressure at the second adjustment end 35 and the elastic force of the first elastic member 36 to push the first priority valve 3 towards the second position. If the power of the pump 2 is relatively low, the oil fluid enters the first outlet end 32 through the first inlet end 31 and simultaneously enters the first adjustment end 34. However, the oil pressure is relatively low and cannot overcome the oil pressure at the second adjustment end 35 and the elastic force of the first elastic member 36 to push the first priority valve 3 to move. Therefore, at this time, the first priority valve 3 always remains in the first position. If the power of the pump 2 is relatively high, the oil fluid first enters the first outlet end 32 through the first inlet end 31 and simultaneously enters the first adjustment end 34. In addition, after another part of the oil fluid enters the steering gear 100, it enters the second adjustment end 35 through the control port 101. After the oil pressure provided by the pump 2 can meet the requirements of the steering gear 100, the oil pressure at the first adjustment end 34 gradually increases, overcomes the oil pressure at the second adjustment end 35 and the elastic force of the first elastic member 36, and pushes the first priority valve 3 towards the second position. At this time, the first inlet end 31 is simultaneously connected to the first outlet end 32 and the second outlet end 33, and the pump 2 supplies oil to the steering gear 100 and other functional modules simultaneously. When the first priority valve 3 is in the second position, if the power of the pump 2 drops again and the oil pressure at the first adjustment end 34 cannot overcome the oil pressure at the second adjustment end 35 and the elastic force of the first elastic member 36, the oil pressure at the second adjustment end 35 and the elastic force of the first elastic member 36 push the first priority valve 3 towards the first position. At this time, the first inlet end 31 is only connected to the first outlet end 32, and the pump 2 only supplies oil to the steering gear 100. Through the above process, the first priority valve 3 can automatically adapt to the flow rate required by the steering gear 100. When the flow rate cannot meet the requirements of the steering gear 100, the first priority valve 3 is in the first position and only supplies oil to the steering gear 100; when the oil fluid flow rate can meet the requirements of the steering gear 100, the first priority valve 3 is in the second position and starts to supply oil to the steering gear 100 and other functional modules.

[0057] Continue to refer to Figure 1 - Figure 2, the agricultural machinery hydraulic system further includes a first control valve 4 and a second control valve 5. The first control valve 4 has a first input end 41, a first output end 42 and a second output end 43. The first input end 41 can be connected to the first output end 42 or the second output end 43. The first input end 41 is connected to the second outlet end 33, and the first output end 42 is used to connect to the first functional module; the second control valve 5 has a second input end 51, a third output end 52 and a fourth output end 53. The second input end 51 can be connected to the third output end 52 or the fourth output end 53. The second input end 51 is connected to the second output end 43, the third output end 52 is used to connect to the second functional module, and the fourth output end 53 is used to connect to the third functional module. That is to say, the oil supply circuits for the three functional modules are independent of each other. The pump 2 can only supply oil to one of the functional modules, and there will be no situation of multiple functional modules sharing the flow, so that when the pump 2 supplies oil to one of the functional modules, the flow rate entering this functional module is relatively large, ensuring its normal operation. One of the functional modules can be set as the lifter 200 of the agricultural machinery, so that the pump 2 can only supply oil to the steering gear 100 and the lifter 200, ensuring that the oil flow rates of the two can meet the requirements.

[0058] The agricultural machinery hydraulic system is only provided with one motor and one pump, which can realize the supply of hydraulic oil to the steering gear 100 and other functional modules. By setting the first priority valve 3, the pump 2 can always supply oil to the steering gear 100. By setting the first control valve 4 and the second control valve 5, the hydraulic oil can be supplied only to the first functional module, only to the second functional module or only to the third functional module, and different functional modules can be set according to actual needs.

[0059] In this embodiment, since the agricultural machinery is a tillage machine, the hydraulic output module is specifically a speed change mechanism and other structures. For a rotary tiller, the hydraulic output module can also be a driving mechanism for driving the plow to rotate. For other types of agricultural machinery, the hydraulic output module is the corresponding working module.

[0060] Optionally, the third functional module is a hydraulic lifter 200. Thus, when the first input end 41 is connected to the second output end 43 and the second input end 51 is connected to the fourth output end 53, the pump 2 only supplies oil to the steering gear 100 and the lifter 200.

[0061] Continue to refer to Figure 1 - Figure 2 , the first control valve 4 has a first output position and a first communication position. When the first control valve 4 is in the first output position, the first input end 41 is connected to the first output end 42; when the first control valve 4 is in the first communication position, the first input end 41 is connected to the second output end 43. The connection between the first input end 41 and the first output end 42 or the second output end 43 can be controlled by controlling the position of the first control valve 4. Figure 2Among them, the A1 connection terminal and the B1 connection terminal are the connection terminals of the first functional module, the A2 connection terminal and the B2 connection terminal are the connection terminals of the second functional module, and the A3 connection terminal and the B3 connection terminal are the connection terminals of the third functional module.

[0062] Optionally, the first control valve 4 further has a first oil return end 44. The first oil return end 44 is used for the oil to flow back to the fuel tank 1. The first output position includes a first forward output position and a first reverse output position. When the first control valve 4 is in the first forward output position, the first input end 41 is connected to the B1 connection terminal for supplying oil to the first functional module, and the A1 connection terminal is connected to the first oil return end 44 for oil return. When the first control valve 4 is in the first reverse output position, the first input end 41 is connected to the A1 connection terminal for supplying oil to the first functional module, and the B1 connection terminal is connected to the first oil return end 44 for oil return. Among them, the first forward output position is Figure 2 the left position of the first control valve 4 in Figure 2 the middle position of the first control valve 4 in Figure 2 the right position of the first control valve 4 in.

[0063] Optionally, the first control valve 4 is further connected with a third elastic member 45. The third elastic member 45 is used to provide an elastic force that makes the first control valve 4 move toward the first communication position, that is, toward the middle position of the first control valve 4.

[0064] Continue to refer to Figure 1 - Figure 2 , the second control valve 5 has a second output position and a second communication position. When the second control valve 5 is in the second output position, the second input end 51 is connected to the third output end 52; when the second control valve 5 is in the second communication position, the second input end 51 is connected to the fourth output end 53. The connection between the second input end 51 and the third output end 52 or the fourth output end 53 can be controlled by controlling the position of the second control valve 5.

[0065] Optionally, the second control valve 5 further has a second oil return end 54. The second oil return end 54 is used for the oil to flow back to the fuel tank 1. The second output position includes a second forward output position and a second reverse output position. When the second control valve 5 is in the second forward output position, the second input end 51 is connected to the B2 connection terminal for supplying oil to the second functional module, and the A2 connection terminal is connected to the second oil return end 54 for oil return. When the second control valve 5 is in the second reverse output position, the second input end 51 is connected to the A2 connection terminal for supplying oil to the second functional module, and the B2 connection terminal is connected to the second oil return end 54 for oil return. Among them, the second forward output position is Figure 2 the left position of the second control valve 5 in Figure 2 the middle position of the second control valve 5 in Figure 2 the right position of the second control valve 5 in.

[0066] Optionally, the second control valve 5 is further connected with a fourth elastic member 55 for providing an elastic force to move the second control valve 5 toward the second communication position, i.e., toward the middle position of the second control valve 5.

[0067] Continue to refer to Figure 1 - Figure 2 , an oil supply line filter 23 is further provided between the pump output end 22 and the first inlet end 31, so that when the oil is supplied to between the first priority valve 3, the oil can be filtered by the oil supply line filter 23 to remove impurities in the oil. Continue to refer to Figure 1 - Figure 2 , the agricultural machinery hydraulic system further includes an oil return line 8 connected to the fuel tank 1, and the oil return line 8 is provided with an oil return line filter 81. In this embodiment, both the first oil return end 44 and the second oil return end 54 are connected to the oil return line 8, so that when the oil flows back from the first oil return end 44 or the second oil return end 54, the oil is filtered by the oil return line filter 81 to remove impurities in the oil.

[0068] Since the steering gear 100 and each functional module generate a certain amount of heat during operation, and heat is also generated during the flow of the oil, resulting in a gradual increase in the temperature of the oil. To cool the oil, the oil return line 8 is further provided with an oil return cooling device 82 to play a role in cooling and prevent the oil temperature from being too high.

[0069] Optionally, an overflow valve 9 is further provided between the second outlet end 33 and the oil return line 8 for relieving pressure when the oil pressure at the second outlet end 33 is too high.

[0070] Embodiment 2

[0071] This embodiment provides another agricultural machinery hydraulic system, which is basically the same as the structure of the agricultural machinery hydraulic system in the first embodiment above. The difference is that the agricultural machinery hydraulic system provided in this embodiment further includes a third control valve 6.

[0072] Refer to Figure 3 - Figure 4 , the third control valve 6 has a third input end 61, a fifth output end 62 and a sixth output end 63. The third input end 61 can be connected to the fifth output end 62 or the sixth output end 63. The third input end 61 is connected to the second output end 43, and the sixth output end 63 is connected to the second input end 51. The fifth output end 62 is used to connect to the fourth functional module, thereby increasing the number of functional modules that the pump 2 can be connected to. Optionally, multiple third control valves 6 can be provided, so that multiple fourth functional modules can be connected, thereby further increasing the number of functional modules that the pump 2 can be connected to.

[0073] Continue to refer to Figure 3 - Figure 4, the third control valve 6 has a third output position and a third communication position. When the third control valve 6 is in the third output position, the third input end 61 is connected to the fifth output end 62; when the third control valve 6 is in the third communication position, the third input end 61 is connected to the sixth output end 63. The connection between the third input end 61 and the fifth output end 62 or the sixth output end 63 can be controlled by controlling the position of the third control valve 6. Figure 4 Among them, the A4 connection end and the B4 connection end are the connection ends of the fourth functional module.

[0074] Optionally, the third control valve 6 further has a third oil return end 64. The third oil return end 64 is connected to the oil return pipeline 8 for the oil to flow back to the fuel tank 1. The third output position includes a third forward output position and a third reverse output position. When the third control valve 6 is in the third forward output position, the third input end 61 is connected to the B4 connection end to supply oil to the fourth functional module, and the A4 connection end is connected to the third oil return end 64 for oil return. When the third control valve 6 is in the third reverse output position, the third input end 61 is connected to the A4 connection end to supply oil to the fourth functional module, and the B4 connection end is connected to the third oil return end 64 for oil return. Among them, the third forward output position is Figure 4 the left position of the third control valve 6 in Figure 4 the middle position of the third control valve 6 in Figure 4 the right position of the third control valve 6 in

[0075] Optionally, the third control valve 6 is further connected with a fifth elastic member 65. The fifth elastic member 65 is used to provide an elastic force that makes the third control valve 6 move towards the third communication position, that is, towards the middle position of the third control valve 6.

[0076] Embodiment 3

[0077] This embodiment provides another agricultural machinery hydraulic system. The difference between this agricultural machinery hydraulic system and the agricultural machinery hydraulic system in the above embodiment is that the first control valve 4, the second control valve 5 and the third control valve 6 are not provided, but a second priority valve 7 is provided.

[0078] Refer to Figure 5, the agricultural machinery hydraulic system includes an oil tank 1, a pump 2, and a first priority valve 3. The pump 2 has a pump input end 21 and a pump output end 22, and the pump input end 21 is connected to the oil tank 1. The first priority valve 3 has a first inlet end 31, a first outlet end 32, and a second outlet end 33. The first inlet end 31 is connected to the pump output end 22, and the first outlet end 32 is used to connect to a steering gear 100. The first priority valve 3 has a first position and a second position. When the first priority valve 3 is in the first position, the first inlet end 31 is only in communication with the first outlet end 32. When the first priority valve 3 is in the second position, the first inlet end 31 is in communication with both the first outlet end 32 and the second outlet end 33. Thus, regardless of whether the first priority valve 3 is in the first position or the second position, the pump 2 can always supply oil to the steering gear 100 to ensure that hydraulic oil is always supplied to the steering gear 100, ensuring that the steering gear 100 can operate and avoiding dangerous situations. In addition, when the first priority valve 3 is in the second position, the pump 2 supplies oil to both the steering gear 100 and other functional modules.

[0079] Optionally, the first priority valve 3 is configured to preferentially move to the first position so that the first priority valve 3 preferentially supplies oil only to the steering gear 100.

[0080] Specifically, the first priority valve 3 also has a first adjustment end 34 and a second adjustment end 35. The oil fluid at the first adjustment end 34 can drive the first priority valve 3 to move towards the second position, and the oil fluid at the second adjustment end 35 can drive the first priority valve 3 to move towards the first position. The first adjustment end 34 is in communication with the first outlet end 32, and the second adjustment end 35 is in communication with the control port 101 of the steering gear 100. The first priority valve 3 is connected to a first elastic member 36, and the first elastic member 36 is used to provide an elastic force for moving the first priority valve 3 towards the first position. When the steering gear 100 is not working, no oil fluid is output from the control port 101, and when the steering gear 100 is working, a certain amount of oil fluid is output from the control port 101. In the initial state, the first priority valve 3 is in the first position under the action of the first elastic member 36.

[0081] Continue to refer to Figure 5, the adjustment process of the first priority valve 3 is as follows: When the steering gear 100 is not working, the oil pressure at the control port 101 is zero, and the oil pressure at the second adjustment end 35 is zero. The oil fluid enters the first outlet end 32 through the first inlet end 31 and simultaneously enters the first adjustment end 34. As long as the oil pressure at the first adjustment end 34 can overcome the elastic force of the first elastic member 36, the first priority valve 3 can be pushed towards the second position. When the steering gear 100 is working, some oil fluid enters the second adjustment end 35. The first adjustment end 34 needs to have a relatively large oil pressure to be able to overcome the oil pressure at the second adjustment end 35 and the elastic force of the first elastic member 36 to push the first priority valve 3 towards the second position. If the power of the pump 2 is relatively low, the oil fluid enters the first outlet end 32 through the first inlet end 31 and simultaneously enters the first adjustment end 34. However, the oil pressure is relatively low and cannot overcome the oil pressure at the second adjustment end 35 and the elastic force of the first elastic member 36 to push the first priority valve 3 to move. Therefore, at this time, the first priority valve 3 always remains in the first position. If the power of the pump 2 is relatively high, the oil fluid first enters the first outlet end 32 through the first inlet end 31 and simultaneously enters the first adjustment end 34. In addition, after another part of the oil fluid enters the steering gear 100, it enters the second adjustment end 35 through the control port 101. After the oil pressure and flow rate provided by the pump 2 can meet the requirements of the steering gear 100, the oil pressure at the first adjustment end 34 gradually increases, overcoming the oil pressure at the second adjustment end 35 and the elastic force of the first elastic member 36, and pushing the first priority valve 3 towards the second position. At this time, the first inlet end 31 is simultaneously connected to the first outlet end 32 and the second outlet end 33, and the pump 2 supplies oil to the steering gear 100 and other functional modules simultaneously. When the first priority valve 3 is in the second position, if the power of the pump 2 drops again and the oil pressure at the first adjustment end 34 cannot overcome the oil pressure at the second adjustment end 35 and the elastic force of the first elastic member 36, the oil pressure at the second adjustment end 35 and the elastic force of the first elastic member 36 push the first priority valve 3 towards the first position. At this time, the first inlet end 31 is only connected to the first outlet end 32, and the pump 2 only supplies oil to the steering gear 100. Through the above process, the first priority valve 3 can automatically adapt to the flow rate required by the steering gear 100. When the flow rate cannot meet the requirements of the steering gear 100, the first priority valve 3 is in the first position and only supplies oil to the steering gear 100; when the flow rate can meet the requirements of the steering gear 100, the first priority valve 3 is in the second position and starts to supply oil to the steering gear 100 and other functional modules.

[0082] Continue to refer to Figure 5, the agricultural machinery hydraulic system further includes a second priority valve 7. The second priority valve 7 has a second inlet end 71, a third outlet end 72, and a fourth outlet end 73. The second inlet end 71 is connected to the second outlet end 33. The third outlet end 72 is connected to the hydraulic lifter 200. The fourth outlet end 73 is used to connect to the multi-way valve assembly. The second priority valve 7 has a third position and a fourth position. When the second priority valve 7 is in the third position, the second inlet end 71 is only communicated with the third outlet end 72. When the second priority valve 7 is in the fourth position, the second inlet end 71 is simultaneously communicated with the third outlet end 72 and the fourth outlet end 73. Thus, no matter whether the second priority valve 7 is in the third position or the fourth position, as long as the first priority valve 3 is in the second position, the pump 2 can supply oil to the hydraulic lifter 200 to ensure that the hydraulic oil is preferentially supplied to the hydraulic lifter 200 and ensure that the oil flow rate of the hydraulic lifter 200 can meet the requirements. When the second priority valve 7 is in the fourth position, the pump 2 can supply oil to the hydraulic lifter 200 and the multi-way valve assembly simultaneously to drive other hydraulic function modules to work.

[0083] The agricultural machinery hydraulic system is only provided with one motor and one pump, and can realize the supply of hydraulic oil to the steering gear 100 and other function modules. By setting the first priority valve 3, the pump 2 can always supply oil to the steering gear 100. By setting the second priority valve 7, the hydraulic oil can be preferentially supplied to the hydraulic lifter 200 to meet the oil flow rate requirements of the hydraulic lifter 200.

[0084] Optionally, the second priority valve 7 is configured to preferentially move to the third position so that the second priority valve 7 preferentially supplies oil only to the hydraulic lifter 200.

[0085] Specifically, the second priority valve 7 further has a third adjustment end 74 and a fourth adjustment end 75. The oil at the third adjustment end 74 can drive the second priority valve 7 to move towards the fourth position. The oil at the fourth adjustment end 75 can drive the second priority valve 7 to move towards the third position. The third adjustment end 74 is communicated with the third outlet end 72. The fourth adjustment end 75 is communicated with the lifter control port of the hydraulic lifter 200. The second priority valve 7 is connected with a second elastic member 76. The second elastic member 76 is used to provide an elastic force for the second priority valve 7 to move towards the third position. When the hydraulic lifter 200 does not work, no oil is output from the lifter control port. When the hydraulic lifter 200 works, a certain amount of oil is output from the lifter control port. In the initial state, the second priority valve 7 is in the third position under the action of the second elastic member 76.

[0086] Refer to Figure 5, the adjustment process of the second priority valve 7 is as follows: When the hydraulic lifter 200 is not working, the oil pressure at the lifter control port is zero, and the oil pressure at the fourth adjustment end 75 is zero. The oil enters the third outlet end 72 through the second inlet end 71 and simultaneously enters the third adjustment end 74. As long as the oil pressure at the third adjustment end 74 can overcome the elastic force of the second elastic member 76, the second priority valve 7 can be pushed towards the fourth position. When the hydraulic lifter 200 is working, some oil enters the fourth adjustment end 75. The third adjustment end 74 needs to have a relatively large oil pressure to simultaneously overcome the oil pressure at the fourth adjustment end 75 and the elastic force of the second elastic member 76 to push the second priority valve 7 towards the fourth position. If the power of the pump 2 is relatively low, the oil enters the third outlet end 72 through the second inlet end 71 and simultaneously enters the third adjustment end 74. However, the oil pressure is relatively low and cannot overcome the oil pressure at the fourth adjustment end 75 and the elastic force of the second elastic member 76 to push the second priority valve 7 to move. Therefore, at this time, the second priority valve 7 always remains in the third position. If the power of the pump 2 is relatively high, the oil first enters the third outlet end 72 through the second inlet end 71 and simultaneously enters the third adjustment end 74. In addition, another part of the oil enters the hydraulic lifter 200 and then enters the fourth adjustment end 75 through the lifter control port. After the oil pressure and flow rate provided by the pump 2 can meet the requirements of the hydraulic lifter 200, the oil pressure at the third adjustment end 74 gradually increases, overcoming the oil pressure at the fourth adjustment end 75 and the elastic force of the second elastic member 76, and pushing the second priority valve 7 towards the fourth position. At this time, the second inlet end 71 is simultaneously connected to the third outlet end 72 and the fourth outlet end 73, and the pump 2 supplies oil to other functional modules. When the second priority valve 7 is in the second position, if the power of the pump 2 drops again and the oil pressure at the third adjustment end 74 cannot overcome the oil pressure at the fourth adjustment end 75 and the elastic force of the second elastic member 76, the oil pressure at the fourth adjustment end 75 and the elastic force of the second elastic member 76 push the second priority valve 7 towards the third position. At this time, the second inlet end 71 is only connected to the third outlet end 72, and the pump 2 only supplies oil to the hydraulic lifter 200. Through the above process, the second priority valve 7 can automatically adapt to the flow rate required by the hydraulic lifter 200. When the flow rate cannot meet the requirements of the hydraulic lifter 200, the second priority valve 7 is in the third position and only supplies oil to the hydraulic lifter 200; when the flow rate can meet the requirements of the hydraulic lifter 200, the second priority valve 7 is in the fourth position and starts to supply oil to other functional modules.

[0087] Embodiment IV

[0088] This embodiment provides an agricultural machine, which includes the agricultural machine hydraulic system in any of the above embodiments, and further includes a steering gear 100. The first outlet end 32 of the first priority valve 3 is connected to the steering gear 100. The above agricultural machine hydraulic system is provided with only one motor and one pump, which can realize the hydraulic oil supply to the steering gear 100 and other functional modules, and can preferentially supply oil to the hydraulic lifter 200 on the premise of meeting the flow demand of the steering gear 100.

[0089] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An agricultural machinery hydraulic system, characterized in that, Comprising: Fuel tank (1); A pump (2) having a pump input end (21) and a pump output end (22), the pump input end (21) being connected to the fuel tank (1); A first priority valve (3) having a first inlet end (31), a first outlet end (32) and a second outlet end (33), the first inlet end (31) being connected to the pump output end (22), the first outlet end (32) being adapted to be connected to a steering gear (100), the first priority valve (3) having a first position and a second position, when the first priority valve (3) is in the first position, the first inlet end (31) is only in communication with the first outlet end (32), and when the first priority valve (3) is in the second position, the first inlet end (31) is in communication with both the first outlet end (32) and the second outlet end (33); A first control valve (4) having a first input end (41), a first output end (42) and a second output end (43), the first input end (41) being capable of being connected to the first output end (42) or to the second output end (43), the first input end (41) being connected to the second outlet end (33), the first output end (42) being adapted to be connected to a first functional module; A second control valve (5) having a second input end (51), a third output end (52) and a fourth output end (53), the second input end (51) being capable of being connected to the third output end (52) or to the fourth output end (53), the second input end (51) being connected to the second output end (43), the third output end (52) being adapted to be connected to a second functional module, and the fourth output end (53) being adapted to be connected to a third functional module.

2. The agricultural machinery hydraulic system according to claim 1, characterized in that, The third functional module is a hydraulic lifter (200).

3. The agricultural machinery hydraulic system according to claim 1, characterized in that, The first control valve (4) has a first output position and a first communication position, when the first control valve (4) is in the first output position, the first input end (41) is connected to the first output end (42); when the first control valve (4) is in the first communication position, the first input end (41) is connected to the second output end (43); The second control valve (5) has a second output position and a second communication position, when the second control valve (5) is in the second output position, the second input end (51) is connected to the third output end (52); when the second control valve (5) is in the second communication position, the second input end (51) is connected to the fourth output end (53).

4. The agricultural machinery hydraulic system according to claim 1, wherein It further comprises a third control valve (6), the third control valve (6) having a third input end (61), a fifth output end (62) and a sixth output end (63), the third input end (61) being capable of being connected to the fifth output end (62) or to the sixth output end (63), the third input end (61) being connected to the second output end (43), the sixth output end (63) being connected to the second input end (51), and the fifth output end (62) being adapted to be connected to a fourth functional module.

5. Agricultural machinery hydraulic system, characterized in that, Comprising: Fuel tank (1); A pump (2) having a pump input end (21) and a pump output end (22), the pump input end (21) being connected to the fuel tank (1); A first priority valve (3) having a first inlet end (31), a first outlet end (32) and a second outlet end (33), the first inlet end (31) being connected to the pump output end (22), the first outlet end (32) being adapted to be connected to a steering gear (100), the first priority valve (3) having a first position and a second position, when the first priority valve (3) is in the first position, the first inlet end (31) communicates only with the first outlet end (32), and when the first priority valve (3) is in the second position, the first inlet end (31) communicates simultaneously with the first outlet end (32) and the second outlet end (33); A second priority valve (7) having a second inlet end (71), a third outlet end (72) and a fourth outlet end (73), the second inlet end (71) being connected to the second outlet end (33), the third outlet end (72) being connected to a hydraulic lifter (200), and the fourth outlet end (73) being adapted to be connected to a multi-way valve assembly; the second priority valve (7) having a third position and a fourth position, when the second priority valve (7) is in the third position, the second inlet end (71) communicates only with the third outlet end (72), and when the second priority valve (7) is in the fourth position, the second inlet end (71) communicates simultaneously with the third outlet end (72) and the fourth outlet end (73).

6. The agricultural machinery hydraulic system according to any one of claims 1-5, characterized in that, The first priority valve (3) further has a first adjustment end (34) and a second adjustment end (35), the hydraulic fluid at the first adjustment end (34) being capable of driving the first priority valve (3) towards the second position, the hydraulic fluid at the second adjustment end (35) being capable of driving the first priority valve (3) towards the first position, the first adjustment end (34) communicating with the first outlet end (32), the second adjustment end (35) communicating with a control port (101) of the steering gear (100), and the first priority valve (3) being connected with a first elastic member (36), the first elastic member (36) being adapted to provide an elastic force for moving the first priority valve (3) towards the first position.

7. The agricultural machinery hydraulic system according to any one of claims 1-5, characterized in that, An oil supply line filter (23) is further provided between the pump output end (22) and the first inlet end (31).

8. The agricultural machinery hydraulic system according to any one of claims 1-5, characterized in that, A return oil line (8) is further included, the return oil line (8) being connected to the fuel tank (1), and a return oil line filter (81) is provided on the return oil line (8).

9. The agricultural machinery hydraulic system according to claim 8, characterized in that, A return oil cooling device (82) is further provided on the return oil line (8).

10. Agricultural machinery, characterized in that, An agricultural machinery hydraulic system according to any one of claims 1-9, further includes a steering gear (100), and the first outlet end (32) of the first priority valve (3) is connected to the steering gear (100).

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