Buffering hydraulic system and agricultural equipment

Abstract

The utility model relates to the technical field of agricultural equipment, in particular to a buffering hydraulic system and agricultural equipment. The first main pipeline and the second main pipeline are respectively connected with the oil tank; the oil cylinder is provided with a large cavity and a small cavity, the first main pipeline is communicated with the large cavity, and the second main pipeline is communicated with the small cavity; the cushion valve group is connected with the first main pipeline and the second main pipeline; the buffer valve group is provided with a first interface and a second interface; the first interface is connected with the oil tank; the second connector is connected with the energy accumulator; the large cavity can communicate with the oil tank through the cushion valve set, and the small cavity can communicate with the energy accumulator through the cushion valve set. The buffer hydraulic system provided by the utility model has multiple working states, can meet general load requirements, can start a buffer mode when the agricultural equipment runs, transports and transfers, reduces the parking maintenance frequency of the agricultural equipment, and can also improve the driving comfort of a driver and the control comfort of the whole machine.

Description

Technical Field

[0001] The present application relates to the technical field of agricultural machinery and equipment, and in particular to a buffer hydraulic system and agricultural machinery and equipment. Background Art

[0002] In order to expand the application range of tractors, it is usually necessary to configure the tractor with a front suspension system. Through the combination of different machines and implements, the market space for tractors as the main machine is broader. Weeding, pruning, spraying, rotary tillage, traction, etc., more and more diversified machines and implements are emerging in an endless stream, which also puts higher requirements on the tractor as the main machine. As the attachment point of the machine, the front suspension is flexible, reliable, easy to adjust, electro-hydraulic control, front lights, front operation buttons, etc., and its functions are becoming more and more abundant.

[0003] When the tractor is working, the whole machine is often impacted during the operation of the implement or when transferring, causing the front suspension to be impacted by the load, which can easily cause damage to the front suspension and require timely repair, affecting the operation process and efficiency of the tractor. When the impact occurs, it will also affect the driver's driving comfort and the control comfort of the whole machine. Utility Model Content

[0004] The purpose of the present application is to provide a buffer hydraulic system and agricultural machinery equipment, so as to solve to a certain extent the technical problem existing in the prior art that the whole machine is often impacted during the operation of the machine or when transferring, causing the front suspension to be subjected to load impact.

[0005] The present application provides a buffer hydraulic system, comprising: a fuel tank;

[0006] a first main pipe and a second main pipe, wherein the first main pipe and the second main pipe are respectively connected to the oil tank;

[0007] An oil cylinder, wherein the oil cylinder has a large cavity and a small cavity, the first main pipeline is connected to the large cavity, and the second main pipeline is connected to the small cavity;

[0008] A buffer valve group, the buffer valve group is connected to the first main line and the second main line; the buffer valve group is provided with a first interface and a second interface, the first interface is connected to the oil tank;

[0009] an accumulator, the second interface being connected to the accumulator;

[0010] The large chamber can be communicated with the oil tank through the buffer valve group, and the small chamber can be communicated with the accumulator through the buffer valve group.

[0011] In the above technical solution, further, the buffer hydraulic system also includes a reversing valve, the reversing valve is arranged in the oil tank, and the reversing valve is connected to the first main line and the second main line at the same time.

[0012] In any of the above technical solutions, further, the valve core of the reversing valve has a first position, an intermediate position and a second position. When the valve core of the reversing valve is in the intermediate position, the oil tank does not supply oil to the outside; when the valve core of the reversing valve is in the first position, the first main line serves as an oil return line, and the second main line serves as an oil supply line; when the valve core of the reversing valve is in the second position, the first main line serves as an oil supply line, and the second main line serves as an oil return line.

[0013] In any of the above technical solutions, further, the buffer valve group includes a main valve component, the main valve component includes a main valve core, the main valve core has four working positions, namely, position one, position two, position three and position four, and the main valve core can switch between the four working positions; when the main valve core is located at the position two, the oil tank and the accumulator are connected through the second main line and the cavity forming the position two;

[0014] When the main valve core is located at the first position, the oil tank is connected to the accumulator, and the first main line is connected to the first interface;

[0015] The position three is the closing valve position of the main valve component; the position four is the pressure relief valve position of the main valve component.

[0016] In any of the above technical solutions, further, the buffer hydraulic system also includes:

[0017] a third pipeline, one end of the third pipeline being connected to the main valve component, and the other end of the third pipeline being connected to the accumulator;

[0018] A fifth pipeline, one end of which is connected to the main valve component, and the other end of which is connected to the first interface.

[0019] In any of the above technical solutions, further, the buffer hydraulic system also includes a fourth pipeline, one end of the fourth pipeline is connected to the main valve component, and the other end of the fourth pipeline is connected to the third pipeline, and the fourth pipeline is used to relieve pressure on the main valve component.

[0020] In any of the above technical solutions, further, the buffer valve group also includes:

[0021] A control valve, the control valve is connected to the third pipeline and the fourth pipeline; the control valve has a first working state and a second working state; the valve core of the control valve has two working positions, a third position and a fourth position; in the first working state, the valve core of the control valve is in the third position, and in the second working state, the valve core of the control valve is in the fourth position;

[0022] A one-way throttle valve is arranged between the control valve and the main valve component. When the valve core of the control valve is in the third position, the control valve is connected to the one-way throttle valve.

[0023] In any of the above technical solutions, further, the buffer valve group also includes a safety valve, and the safety valve is provided with a set pressure value; the safety valve is connected to the third pipeline and the fifth pipeline at the same time.

[0024] In any of the above technical solutions, further, the buffer valve group also includes a release valve, the release valve is connected to the third pipeline and the fifth pipeline at the same time, and the release valve is located between the safety valve and the main valve component;

[0025] The valve core of the release valve has two working positions, namely a fifth position and a sixth position, and the release valve can switch between the fifth position and the sixth position.

[0026] The present application also provides an agricultural machinery device, including the buffer hydraulic system described in any of the above technical solutions, and thus has all the beneficial technical effects of the buffer hydraulic system, which will not be repeated here.

[0027] Compared with the prior art, the beneficial effects of this application are:

[0028] The buffer hydraulic system provided by the present application includes: an oil tank; a first main line and a second main line, the first main line and the second main line are respectively connected to the oil tank; an oil cylinder, the oil cylinder has a large cavity and a small cavity, the first main line is connected to the large cavity, and the second main line is connected to the small cavity; a buffer valve group, the buffer valve group is connected to the first main line and the second main line; the buffer valve group is provided with a first interface and a second interface, the first interface is connected to the oil tank; an accumulator, the second interface is connected to the accumulator; the large cavity can be connected to the oil tank through the buffer valve group, and the small cavity can be connected to the accumulator through the buffer valve group.

[0029] The buffer hydraulic system provided in the present application has multiple working states. It can not only meet general load requirements, but also enable the buffer mode when the agricultural machinery is being transported and transferred, so that the impact of the load can be effectively buffered under special working conditions such as bumpy road conditions, thereby stabilizing the vehicle body, reducing the impact of the load on the vehicle body, and reducing the risk of damage to the cylinder, thereby reducing the frequency of agricultural machinery shutdown and maintenance, and can also improve the driver's driving comfort and the control comfort of the entire machine.

[0030] The agricultural machinery equipment provided in the present application includes the buffer hydraulic system described above. Therefore, through the buffer hydraulic system, the buffer operation mode can be performed when necessary, reducing the risk of cylinder damage, and also reducing the frequency and duration of the agricultural machinery equipment's shutdown for maintenance, thereby ensuring the operation time and efficiency of the agricultural machinery equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of the structure of a buffer hydraulic system provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the oil circuit of the rising and flushing states of the buffer hydraulic system provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the oil circuit of the descending state of the buffer hydraulic system provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of an oil circuit in a buffer state of a buffer hydraulic system provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of the oil circuit of the buffer hydraulic system in the pressure release state provided in an embodiment of the present application.

[0037] Reference numerals:

[0038] 1-oil tank, 2-oil cylinder, 201-large chamber, 202-small chamber, 203-piston rod, 3-reversing valve, 4-first main line, 5-second main line, 6-main valve component, a-position one, b-position two, c-position three, d-position four, 7-control valve, 701-third position, 702-fourth position, 8-one-way throttle valve, 9-release valve, 901-fifth position, 902-sixth position, 10-accumulator, 11-safety valve, 12-buffer valve group, T-first interface, X-second interface, A-first pipeline, B-second pipeline, C-third pipeline, D-fourth pipeline, E-fifth pipeline, F-sixth pipeline, G-seventh pipeline, H-eighth pipeline, I-ninth pipeline, J-tenth pipeline, K-eleventh pipeline, L-twelfth pipeline, M-thirteenth pipeline. DETAILED DESCRIPTION

[0039] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0040] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0041] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0042] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, 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 cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] Refer to the following Figures 1 to 5 The buffer hydraulic system and agricultural machinery according to the embodiments of the present application are described.

[0045] See also Figures 1 to 5 As shown, an embodiment of the present application provides a buffer hydraulic system, which is particularly suitable for tractor front suspension. The buffer hydraulic system includes: an oil cylinder 2, an oil tank 1, a buffer valve group 12 and an accumulator 10. The oil tank 1 is connected to the oil cylinder 2, so as to supply oil to the oil cylinder 2 so that the oil cylinder 2 can work normally. The oil cylinder 2 is provided with a first main line 4 and a second main line 5. One of the first main line 4 and the second main line 5 is used to supply pressure oil to the outside, and the other of the two is used to return pressure oil to the oil tank 1. The specific role of the two is determined by the working state of the buffer hydraulic system.

[0046] The buffer hydraulic system also includes a reversing valve 3, which is arranged in the oil tank 1. The reversing valve 3 is connected to the first main line 4 and the second main line 5 at the same time, and is used to control the on-off of the oil supply and return oil lines of the oil cylinder 2. The buffer valve group 12 is connected to the first main line 4 and the second main line 5 at the same time. The buffer valve group 12 is provided with a first interface T and a second interface X. The first interface T is connected to the oil tank 1, and the second interface X is connected to the accumulator 10. The pressure oil in the oil tank 1 can flow to the accumulator 10 through the buffer valve group 12 to replenish the pressure oil to the accumulator 10. , and the pressure oil in the accumulator 10 can also flow back to the oil tank 1 through the buffer valve group 12 to relieve the pressure of the accumulator 10. The oil cylinder 2 can be connected and communicated with the buffer valve group 12 through the second main line 5, so that the oil cylinder 2 can communicate with the accumulator 10 through the buffer valve group 12. When the oil cylinder 2 or the front suspension using the buffer hydraulic system is impacted, the pressure oil in the oil cylinder 2 can flow to the accumulator 10 and finally flow back to the oil tank 1, so that the impact on the oil cylinder 2 is buffered, so as to stabilize the vehicle body and reduce the impact of the load on the vehicle body. The load here can specifically be the agricultural machinery loaded on the front suspension.

[0047] It should be noted that the first interface T is specifically an end port of the first main line 4 away from the oil tank 1, and the first interface T is directly connected to the oil tank 1 through another pipeline. The end of the second main line 5 away from the oil tank 1 is provided with a second interface X, and the second interface X is connected to the accumulator 10, and the second interface X is located between the accumulator 10 and the safety valve 11 described below.

[0048] Further, the oil cylinder 2 includes a piston rod 203 and a large chamber 201 and a small chamber 202 separated by the piston rod 203, wherein Figure 2 As shown, the large chamber 201 is connected to the first main line 4 through the first pipeline A, the small chamber 202 is connected to the second main line 5 through the second pipeline B, the upper chamber of the oil cylinder 2 is the large chamber 201, and the lower chamber of the oil cylinder 2 is the small chamber 202. When the pressure oil flows into the small chamber 202 through the second main line 5 and the second pipeline B, the piston rod 203 moves upward and squeezes the large chamber 201, so that the pressure oil in the large chamber 201 can flow from the first pipeline A to the first main line 4.

[0049] Furthermore, the reversing valve 3 is a multi-way valve, preferably a three-position valve, and may be, but not limited to, a solenoid valve. The valve core of the reversing valve 3 has three working positions, namely, a first position, a middle position and a second position. When the valve core is in the middle position, the oil tank 1 does not supply oil to the outside, and the oil cylinder 2 has no oil inlet or outlet, and can remain at a certain position without moving.

[0050] Furthermore, the buffer valve group 12 includes a main valve member 6, and the main valve member 6 includes a main valve core. Preferably, the main valve member 6 is a four-position valve, and the main valve core has four working positions, namely position 1 a, position 2 b, position 3 c and position 4 d. When pressure oil enters the main valve member 6, the main valve core can switch between various working positions under the action of the pressure oil. The first main line 4 and the second main line 5 are respectively connected to the main valve member 6. The buffer hydraulic system also includes a third line C, one end of which is connected to the main valve member 6, and the other end of which is connected to the accumulator 10. In this embodiment, Figure 1 As shown, from left to right, they are position 1a, position 2b, position 3c and position 4d. When the main valve core is at position 3c, the main valve member 6 is in a closed state. At this time, the oil path between the reversing valve 3 and the accumulator 10 is blocked, and the pressure oil flowing out of the reversing valve 3 will not flow to the accumulator 10 through the main valve core. When the main valve core is at position 2b, the first pipeline A is connected with the third pipeline C through the cavity at position 1a, so that the pressure oil can flow to the accumulator 10 through the third pipeline C to fill the accumulator 10. When the pressure of the accumulator 10 reaches the set value, and the pressure oil is still introduced into the main valve member 6 in a short time, the main valve core is affected by the pressure of the pressure oil and moves from position 2b to position 4d.

[0051] The buffer hydraulic system also includes a fourth pipeline D, one end of which is connected to the portion of the main valve component 6 corresponding to position four d, and the other end of the fourth pipeline D is connected to the third pipeline C. When the main valve core moves to position four d, the pressure oil and the pressure generated by it move to position four d accordingly, so that the pressure in the main valve component 6 can be released through the fourth pipeline D at this time. After the main valve component 6 completes the pressure relief, the main valve core returns to position one a.

[0052] The buffer hydraulic system also includes a fifth pipeline E, one end of which is connected to the main valve component 6, and the other end of the fifth pipeline E is connected to the oil tank 1 or the first interface T. When the main valve core is at position a, the first main pipeline 4 and the fifth pipeline E can be connected through the cavity at position a.

[0053] Furthermore, the buffer valve group 12 also includes a control valve 7, which has a first working state and a second working state. The control valve 7 is preferably a two-position solenoid valve. The first working state corresponds to the energized state of the solenoid valve, and the second working state corresponds to the de-energized state of the solenoid valve. When the solenoid valve is energized, the valve core is in the third position 701, and when the solenoid valve is de-energized, the valve core is in the fourth position 702.

[0054] The buffer hydraulic system also includes a sixth pipeline F and a seventh pipeline G, wherein one end of the sixth pipeline F is connected to the fifth pipeline E, and the other end of the sixth pipeline F is connected to the control valve 7; one end of the seventh pipeline G is connected to the third pipeline C, and the other end of the seventh pipeline G is connected to the control valve 7.

[0055] Furthermore, the buffer valve group 12 also includes a one-way throttle valve 8, and the buffer hydraulic system also includes an eighth pipeline H, one end of the eighth pipeline H is connected to the control valve 7, and the other end of the eighth pipeline H is connected to the one-way throttle valve 8. When the valve core of the control valve 7 is in position three c, the seventh pipeline G, the control valve 7, the eighth pipeline H, and the one-way throttle valve 8 are connected in sequence. When the valve core of the control valve 7 is in position four d, the control valve 7 and the one-way throttle valve 8 are not connected.

[0056] Furthermore, the buffer hydraulic system also includes a ninth pipeline I, one end of which is connected to the one-way throttle valve 8, and the other end of the ninth pipeline I is connected to the main valve component 6. When pressure oil flows out through the one-way throttle valve 8 and the ninth pipeline I, this part of the pressure oil can flow into the main valve component 6 and act on the main valve core to move the main valve core from other positions to position a.

[0057] Further, the buffer valve group 12 also includes a release valve 9, which is preferably a two-position valve, and the valve core of the release valve 9 can be switched between the fifth position 901 and the sixth position 902 by manual control or electric control. The buffer hydraulic system also includes a tenth pipeline J and an eleventh pipeline K, one end of the tenth pipeline J is connected to the third pipeline C, the other end of the tenth pipeline J is connected to the release valve 9, one end of the eleventh pipeline K is connected to the release valve 9, and the other end of the eleventh pipeline K is connected to the fifth pipeline E.

[0058] Furthermore, the buffer valve group 12 also includes a safety valve 11, a twelfth pipeline L and a thirteenth pipeline M, one end of the twelfth pipeline L is connected to the second main pipeline 5, and the other end of the twelfth pipeline L is connected to the safety valve 11; one end of the thirteenth pipeline M is connected to the first main pipeline 4, and the other end of the thirteenth pipeline M is connected to the safety valve 11.

[0059] The buffer hydraulic system provided in the present application has an oil circuit capable of realizing a plurality of working states including a neutral state, an ascending and flushing state, a descending state, a buffer state and a pressure release state.

[0060] (1) Median state

[0061] In the neutral state, the reversing valve 3 is in the middle position, the oil tank 1 does not pump oil outward, and the buffer valve group 12 does not work. At this time, the oil cylinder 2 remains in a certain position, and the main valve core is in position three c, and the accumulator 10 does not participate in the work.

[0062] (2) Rising and flushing status

[0063] In this state, the buffer pressure system performs as follows Figure 2 In the oil circuit indicated by the middle arrow, the reversing valve 3 moves to the first position. At this time, the second main line 5 acts as the oil supply line, and the first main line 4 acts as the oil return line. The pressure oil in the oil tank 1 flows out through the reversing valve 3 and is divided into two paths. One path is delivered to the small chamber 202 of the oil cylinder 2 through the second line B. The piston rod 203 moves, and the pressure oil in the large chamber 201 of the oil cylinder 2 flows from the first line A to the first main line 4 and flows back to the oil tank 1. The other path of pressure oil after flowing out of the reversing valve 3 continues to flow along the second main line 5 and flows to the main valve component 6. The hydraulic oil flows to the accumulator 10 through the cavity at position 2b. When the filling pressure in the accumulator 10 reaches the set value, the main valve core shifts from position 2b to position 4d to release the pressure in the main valve component 6. When there is no pressure in the main valve component 6, the main valve core returns to position 1a under the elastic force of the spring to wait.

[0064] The above oil circuit not only completes the filling of the accumulator 10, but also completes the normal oil circuit of the oil cylinder 2, so that the oil cylinder 2 can be injected with pressurized oil and have sufficient power to carry the load and rise synchronously, so as to ensure the normal operation of agricultural machinery such as tractors using this buffer hydraulic system.

[0065] (3) Descending state

[0066] In this state, the buffer pressure system performs as follows Figure 3 In the oil circuit indicated by the middle arrow, the reversing valve 3 moves to position three c again. At this time, the second main line 5 acts as the return oil line, the first main line 4 acts as the supply oil line, the buffer valve group 12 and the accumulator 10 do not need to participate in the work, and the pressure oil in the oil tank 1 flows out through the reversing valve 3 through the first main line 4 and the first line A to the large chamber 201 of the oil cylinder 2, and the pressure oil squeezes the piston rod 203, while the pressure oil in the small chamber 202 of the oil cylinder 2 flows back to the oil tank 1 through the second line B, the second main line 5 and the reversing valve 3. The piston rod 203 is squeezed by the above-mentioned oil circuit. Combined with the gravity of the load, the oil cylinder 2 can descend together with the load.

[0067] (4) Buffer status

[0068] This working state can be executed when the tractor's front suspension is carrying heavy objects in the state of transfer or transportation. In the buffer state, this buffer hydraulic system performs as follows: Figure 4The oil circuit indicated by the middle arrow first triggers the control valve 7, so that the control valve 7 switches from the non-powered state to the powered state, and the valve core of the control valve 7 switches from the third position 701 to the fourth position 702. The pressure oil in the accumulator 10 is mainly used to the main valve component 6 through the control valve 7 and the one-way throttle valve 8. Under the action of the pressure oil, the main valve core moves to position a. At this time, the pipeline between the small chamber 202 of the oil tank 1 and the accumulator 10 is connected through the main valve component 6, so that the small chamber 202 of the oil cylinder 2 can be connected to the accumulator 10 through the second pipeline B, the cavity of the main valve component 6 at position a, and the second main pipeline 5, while the large chamber 201 of the oil cylinder 2 is connected to the oil tank 1 through the first pipeline A, the first main pipeline 4, the cavity of the main valve component 6 at position a, and the first interface T. It should be noted that when the front suspension is stably loaded, the oil cylinder 2 can be stabilized in the current state without continuous oil supply.

[0069] When the load or the front suspension is impacted, the piston rod 203 of the oil cylinder 2 retracts due to the impact force, causing the pressure in the large chamber 201 and the small chamber 202 of the oil cylinder 2 to change, and the small chamber 202 is connected to the accumulator 10, so that the pressure oil in the accumulator 10 can buffer the pressure change in the small chamber 202, and the large chamber 201 is connected to the oil tank 1 to buffer the pressure change in the large chamber 201, and the pressure oil flowing through the safety valve 11 will also flow back to the oil tank 1, thereby reducing the risk of damage to the oil cylinder 2, and can also stabilize the vehicle body, reduce the impact of the load on the vehicle body, and improve the comfort of the whole machine operation, and the solenoid valve can be controlled manually or electronically to achieve one-click switching to the buffer state, which is simple to operate and will not affect the normal operation of the driver.

[0070] In addition, it should be noted that when the load or the front suspension is impacted, not only the pressure in the large chamber 201 and the small chamber 202 of the cylinder 2 will change, but the pressure in the third pipeline C, the fifth pipeline E and other pipelines will also change. This change will also affect the change of the pressure oil flowing through the safety valve 11. When the pressure change is greater than the set value of the safety valve 11, the excess pressure oil will also pass through the safety valve 11.

[0071] (5) Pressure release state

[0072] In this state, the buffer pressure system performs as follows Figure 5 In the oil circuit indicated by the middle arrow, when the pressure of the accumulator 10 needs to be released, the valve core of the release valve 9 can be switched to the sixth position 902 from the fifth position 901 in the above multiple states by manually controlling the release valve 9, and the pressure oil in the accumulator 10 flows into the oil tank 1 through the release valve 9, the first main line 4, and the first interface T, so that the accumulator 10 can quickly release the pressure.

[0073] To sum up, the buffer hydraulic system provided by the present application has multiple working states, which can not only meet general load requirements, but also enable the buffer mode when the agricultural machinery equipment is traveling, transporting, and transferring, so that the impact of the load can be effectively buffered under special working conditions such as bumpy road conditions, thereby stabilizing the vehicle body, reducing the impact of the load on the vehicle body, and reducing the risk of damage to the cylinder 2, thereby reducing the frequency of agricultural machinery equipment stopping for maintenance, and can also improve the driver's driving comfort and the control comfort of the entire machine.

[0074] An embodiment of the present application also provides an agricultural machinery device, including the buffer hydraulic system described in any of the above embodiments, and thus has all the beneficial technical effects of the buffer hydraulic system, which will not be repeated here.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A buffer pressure system, characterized in that: include: tank; a first main pipe and a second main pipe, wherein the first main pipe and the second main pipe are respectively connected to the oil tank; An oil cylinder, wherein the oil cylinder has a large cavity and a small cavity, the first main pipeline is connected to the large cavity, and the second main pipeline is connected to the small cavity; A buffer valve group, the buffer valve group is connected to the first main line and the second main line; the buffer valve group is provided with a first interface and a second interface, the first interface is connected to the oil tank; an accumulator, the second interface being connected to the accumulator; The large chamber can be communicated with the oil tank through the buffer valve group, and the small chamber can be communicated with the accumulator through the buffer valve group.

2. The buffer hydraulic system according to claim 1, characterized in that: The buffer hydraulic system further includes a reversing valve, which is disposed on the oil tank and is connected to the first main line and the second main line at the same time.

3. The buffer hydraulic system according to claim 2, characterized in that: The valve core of the reversing valve has a first position, an intermediate position and a second position. When the valve core of the reversing valve is in the intermediate position, the oil tank does not supply oil to the outside; when the valve core of the reversing valve is in the first position, the first main line serves as an oil return line, and the second main line serves as an oil supply line; when the valve core of the reversing valve is in the second position, the first main line serves as an oil supply line, and the second main line serves as an oil return line.

4. The buffer hydraulic system according to claim 1, characterized in that: The buffer valve group includes a main valve component, the main valve component includes a main valve core, the main valve core has four working positions, namely, position one, position two, position three and position four, and the main valve core can switch between the four working positions; when the main valve core is located at position two, the oil tank is connected to the accumulator through the second main pipeline and the cavity forming the position two; When the main valve core is located at the first position, the oil tank is connected to the accumulator, and the first main line is connected to the first interface; The position three is the closing valve position of the main valve component; the position four is the pressure relief valve position of the main valve component.

5. The buffer hydraulic system according to claim 4, characterized in that: The buffer hydraulic system also includes: a third pipeline, one end of the third pipeline being connected to the main valve component, and the other end of the third pipeline being connected to the accumulator; A fifth pipeline, one end of which is connected to the main valve component, and the other end of which is connected to the first interface.

6. The buffer hydraulic system according to claim 5, characterized in that: The buffer hydraulic system further includes a fourth pipeline, one end of which is connected to the main valve component, and the other end of which is connected to the third pipeline. The fourth pipeline is used to relieve pressure on the main valve component.

7. The buffer hydraulic system according to claim 6, characterized in that: The buffer valve group also includes: A control valve, the control valve is connected to the third pipeline and the fourth pipeline; the control valve has a first working state and a second working state; the valve core of the control valve has two working positions, a third position and a fourth position; in the first working state, the valve core of the control valve is in the third position, and in the second working state, the valve core of the control valve is in the fourth position; A one-way throttle valve is arranged between the control valve and the main valve component. When the valve core of the control valve is in the third position, the control valve is connected to the one-way throttle valve.

8. The buffer hydraulic system according to claim 5, characterized in that: The buffer valve group also includes a safety valve, and the safety valve is provided with a set pressure value; the safety valve is connected to the third pipeline and the fifth pipeline at the same time.

9. The buffer hydraulic system according to claim 8, characterized in that: The buffer valve group further comprises a release valve, which is connected to the third pipeline and the fifth pipeline at the same time, and is located between the safety valve and the main valve component; The valve core of the release valve has two working positions, namely a fifth position and a sixth position, and the release valve can switch between the fifth position and the sixth position.

10. An agricultural machine, characterized in that: A buffer hydraulic system comprising the buffer hydraulic system according to any one of claims 1 to 9.

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