Hydraulic system suitable for sequential action of oil cylinders of corn machine

Abstract

The utility model provides a hydraulic system suitable for sequential actions of oil cylinders of a corn machine, which comprises a hydraulic pump, a lifting oil cylinder and an overturning oil cylinder, and an outlet of the hydraulic pump is connected with a multi-way valve; the multi-way valve is provided with a first interface and a second interface, the first interface is provided with a first branch and a second branch, the first branch is connected with the extension end of the lifting oil cylinder, the second branch is connected with the extension end of the overturning oil cylinder, and the second branch is provided with a first sequence valve; the two-way connector is provided with a third branch and a fourth branch, the third branch is connected with the withdrawing end of the lifting oil cylinder, the third branch is provided with a second sequence valve, and the fourth branch is connected with the withdrawing end of the overturning oil cylinder. According to the utility model, the sequence action of the oil cylinder is controlled through the multi-way valve and the sequence valve, so that the turnover unloading and returning work of the grain tank is controlled, electric control structures such as a sensor are omitted, faults are avoided, and the reliability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of harvester hydraulic systems, in particular to a hydraulic system suitable for sequential actions of corn harvester oil cylinders. Background Art

[0002] At present, harvesting operations have more and more requirements on the functions of agricultural harvesting machinery. Many functions of corn harvesters that harvest both stalks and ears need to add more hydraulic components to perform. For example, when unloading grain from the grain box of a corn harvester, the harvester needs to lift the grain box first, then flip it; when returning the grain box, it needs to flip it back first, then lift it back to complete the entire grain unloading action.

[0003] At present, the hydraulic system of the corn harvester is controlled by auxiliary components such as multi-way valves, various functional hydraulic cylinders, and sensors. For the sequential actions of lifting and flipping the grain box, the two-way valve in the multi-way valve controls the grain box lifting cylinder and the grain box flipping cylinder respectively. The position of the grain box is detected by the sensor to determine that the lifting cylinder action is completed, and then feedback is given to control the flip cylinder action. When returning to the position, the sensor first detects the return of the flip cylinder, and then feedback is given to control the sequential action of the lifting cylinder. When this device is actually put into use, the sensor has a high failure rate and insufficient reliability; in addition, the installation position of the sensor is inevitably close to the movement path of the grain box, resulting in frequent accidents of the grain box moving and damaging the sensor; there are obstacles to the normal application of the grain box flipping and unloading function. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to reliably control the sequential actions of lifting and turning over of a grain box.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] The utility model provides a hydraulic system suitable for the sequential action of the oil cylinders of a corn machine, comprising a hydraulic pump, a lifting cylinder and a turning cylinder, wherein the outlet of the hydraulic pump is connected to a multi-way valve; the multi-way valve is provided with a one-way interface and a two-way interface, the one-way interface is provided with a first branch and a second branch, the first branch is connected to the extension end of the lifting cylinder, the second branch is connected to the extension end of the turning cylinder, and the second branch is provided with a first sequence valve; the two-way interface is provided with a third branch and a fourth branch, the third branch is connected to the retraction end of the lifting cylinder, the third branch is provided with a second sequence valve, and the fourth branch is connected to the retraction end of the turning cylinder.

[0007] The beneficial effects of the utility model are:

[0008] By adopting the utility model, the one-way interface output and the two-way interface output are switched through the multi-way valve, so as to operate the overturning and unloading and returning work of the grain box of the corn machine; when overturning and unloading, the first sequence valve is used to control the sequential action of the lifting cylinder extending to the overturning cylinder extending, and when the grain box returns, the second sequence valve is used to control the sequential action of the overturning cylinder retracting to the lifting cylinder retracting, thereby realizing reliable control of the sequential action of lifting and overturning of the grain box; the electric control structure such as the sensor is omitted, thus avoiding malfunction and avoiding the problem of the grain box hitting the instrument, and having good reliability.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the first sequence valve and the second sequence valve are fixed differential pressure reducing valves.

[0011] It is convenient to set the sequential action pressure of the oil cylinder, with good reliability and stable operation.

[0012] Furthermore, the multi-way valve includes an oil inlet circuit, an oil return circuit and a three-position four-way solenoid valve, the hydraulic oil port of the three-position four-way solenoid valve is connected to the oil inlet circuit, the oil return port of the three-position four-way solenoid valve is connected to the oil return circuit, the first external interface of the three-position four-way solenoid valve is the one-way interface, and the second external interface of the three-position four-way solenoid valve is the two-way interface; the outlet of the hydraulic pump is connected to the oil inlet circuit of the multi-way valve.

[0013] Simple structure and good reliability.

[0014] Furthermore, it also includes an oil tank, and the inlet of the hydraulic pump and the oil return port of the three-position four-way solenoid valve are both connected to the oil tank.

[0015] It is convenient for oil supply and recycling and easy to install.

[0016] Furthermore, the outlet of the hydraulic pump is also connected to a filter.

[0017] It is convenient to improve the cleanliness of the hydraulic system and prolong the service life of the multi-way valve, the lifting cylinder and the tilting cylinder.

[0018] Furthermore, the multi-way valve also includes a pressure relief valve, and two ends of the pressure relief valve are respectively connected to the oil inlet circuit and the oil return circuit.

[0019] It is convenient to return the excess oil pressure in the oil inlet line to avoid excessive pressure in the oil inlet line.

[0020] Furthermore, the multi-way valve also includes a safety valve, and two ends of the safety valve are respectively connected to the oil inlet circuit and the oil return circuit.

[0021] It is convenient to release pressure when the oil inlet pressure is too high, thereby improving the safety of the hydraulic system.

[0022] Furthermore, a one-way throttle valve is also provided on the one-way interface.

[0023] The one-way throttle valve is composed of a one-way valve and a throttle valve in parallel, which is convenient for controlling the hydraulic flow of one interface, reducing the pressure fluctuation of the cylinder and having good reliability.

[0024] Furthermore, a first one-way overflow valve is also provided on the one-way interface, and an overflow end of the first one-way overflow valve is connected to the two-way interface.

[0025] The one-way relief valve is composed of a one-way valve and a relief valve in series. When lifting and unloading grain, it is convenient to guide the excess oil pressure on the first interface to the second interface for oil return, reducing the pressure fluctuation during the lifting process of the cylinder and having good stability.

[0026] Furthermore, a second one-way overflow valve is provided on the two-way interface, and an overflow end of the second one-way overflow valve is connected to the one-way interface.

[0027] When the grain tank returns to its original position, it is convenient to guide the excess oil pressure on the second-way interface to the first-way interface for oil return, reducing the pressure fluctuation during the oil cylinder retraction process and improving stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the utility model.

[0029] In the accompanying drawings, the technical features represented by the reference numerals are as follows:

[0030] 1-Oil tank; 2-Hydraulic pump; 3-Multi-way valve; 31-Oil inlet; 32-Oil return; 33-Three-position four-way solenoid valve; 34-Pressure relief valve; 35-Safety valve; 4-Lifting cylinder; 5-Tilting cylinder; 6-First sequence valve; 7-Second sequence valve; 8-One-way throttle valve; 9-First one-way overflow valve; 10-Second one-way overflow valve; 11-Filter. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0032] This utility model refers to Figure 1 .

[0033] The utility model provides a hydraulic system suitable for the sequential action of the oil cylinders of a corn machine, comprising a hydraulic pump 2, a lifting cylinder 4, and a turning cylinder 5. The outlet of the hydraulic pump 2 is connected to a multi-way valve 3; the multi-way valve 3 is provided with a one-way interface and a two-way interface, the one-way interface is provided with a first branch and a second branch, the first branch is connected to the extension end of the lifting cylinder 4, the second branch is connected to the extension end of the turning cylinder 5, and the second branch is provided with a first sequence valve 6; the two-way interface is provided with a third branch and a fourth branch, the third branch is connected to the retraction end of the lifting cylinder 4, the third branch is provided with a second sequence valve 7, and the fourth branch is connected to the retraction end of the turning cylinder 5.

[0034] principle:

[0035] In the installed state, the inlet of the hydraulic pump 2 and the oil return port of the multi-way valve 3 are connected to the oil tank 1 for oil supply. The hydraulic pump 2 supplies oil to the multi-way valve 3, and the multi-way valve 3 has three states: closed, one-way interface output, and two-way interface output. The lifting cylinder 4 and the tilting cylinder 5 are both two-way cylinders, so there are oil ports at both ends. When oil is supplied from one end, the cylinder extends, which is called the extension end; when oil is supplied from the other end, the cylinder retracts, which is called the retraction end.

[0036] In the working state, when the multi-way valve 3 is closed, the corn machine grain box does not move. When the multi-way valve 3 switches to the output of the one-way interface, the two-way interface can return oil, the corn machine grain box flips and unloads grain, and the oil cylinder sequence moves as follows: the hydraulic oil enters the extension end of the lifting cylinder 4 through the first branch, and the lifting cylinder 4 extends. At this time, due to the action of the first sequence valve 6 on the second branch, the oil pressure has not yet reached the action pressure of the flip cylinder 5, and the flip cylinder 5 does not move. After the lifting cylinder 4 extends, the oil pressure rises further until the second branch reaches the extension pressure of the flip cylinder 5, and the flip cylinder 5 extends. When the multi-way valve 3 switches to the output of the two-way interface, the one-way interface can return oil, the corn machine grain box returns to its position, and the oil cylinder sequence moves as follows: the hydraulic oil enters the retraction oil circuit 32 of the flip cylinder 5 through the fourth branch, and the flip cylinder 5 retracts. At this time, due to the action of the second sequence valve 7 on the third branch, the oil pressure has not yet reached the action pressure of the lifting cylinder 4, and the lifting cylinder 4 does not move. After the tilting cylinder 5 is retracted, the oil pressure further increases until the third branch reaches the retraction pressure of the lifting cylinder 4, and the lifting cylinder 4 is retracted.

[0037] In summary, by adopting the utility model, the one-way interface output and the two-way interface output are switched through the multi-way valve 3, so as to operate the flipping, unloading and returning of the grain box of the corn machine; when flipping and unloading, the first sequence valve 6 is used to control the sequential action of the extension of the lifting cylinder 4 to the extension of the flipping cylinder 5, and when the grain box returns, the second sequence valve 7 is used to control the sequential action of the retraction of the flipping cylinder 5 to the retraction of the lifting cylinder 4, thereby realizing reliable control of the lifting and flipping sequential actions of the grain box; the electronic control structure such as the sensor is omitted, thus avoiding malfunctions and avoiding the problem of the grain box hitting the instrument, and the reliability is good.

[0038] Furthermore, the first sequence valve 6 and the second sequence valve 7 are fixed differential pressure reducing valves.

[0039] Note: If the set pressure is 5MPa, and the action pressures of lifting cylinder 4 and tilting cylinder 5 are both 6MPa, then when the system pressure is 6MPa, the pressure of the one without sequence valve reaches 6MPa and can act; the other one has a sequence valve, and the outlet pressure of the sequence valve is 6-5=1MPa, so it will not act. When the action of one way is completed and the system pressure continues to rise to 11MPa, the pressure of the other way can reach 11-5=6MPa and can act, thus realizing sequential action.

[0040] It is convenient to set the sequential action pressure of the oil cylinder, with good reliability and stable operation.

[0041] Furthermore, the multi-way valve 3 includes an oil inlet circuit 31, an oil return circuit 32 and a three-position four-way solenoid valve 33, the hydraulic oil port of the three-position four-way solenoid valve 33 is connected to the oil inlet circuit 31, the oil return port of the three-position four-way solenoid valve 33 is connected to the oil return circuit 32, the first external interface of the three-position four-way solenoid valve 33 is the one-way interface, and the second external interface of the three-position four-way solenoid valve 33 is the two-way interface; the outlet of the hydraulic pump 2 is connected to the oil inlet circuit 31 of the multi-way valve 3.

[0042] Simple structure and good reliability.

[0043] Furthermore, it also includes an oil tank 1, and the inlet of the hydraulic pump 2 and the oil return port of the three-position four-way solenoid valve 33 are both connected to the oil tank 1.

[0044] It is convenient for oil supply and recycling and easy to install.

[0045] Furthermore, the outlet of the hydraulic pump 2 is also connected to a filter 11 .

[0046] It is convenient to improve the cleanliness of the hydraulic system and prolong the service life of the multi-way valve 3, the lifting cylinder 4 and the tilting cylinder 5.

[0047] Furthermore, the multi-way valve 3 further includes a pressure relief valve 34 , and two ends of the pressure relief valve 34 are respectively connected to the oil inlet circuit 31 and the oil return circuit 32 .

[0048] This facilitates the reflux of the excess oil pressure on the oil inlet line 31 , thereby preventing the oil inlet line 31 from having excessive pressure.

[0049] Furthermore, the multi-way valve 3 further includes a safety valve 35 , and two ends of the safety valve 35 are respectively connected to the oil inlet circuit 31 and the oil return circuit 32 .

[0050] It is convenient to release the pressure when the pressure of the oil inlet circuit 31 is too high, thereby improving the safety of the hydraulic system.

[0051] Furthermore, a one-way throttle valve 8 is also provided on the one-way interface.

[0052] The one-way throttle valve 8 is composed of a one-way valve and a throttle valve in parallel, which is convenient for controlling the hydraulic flow of one interface, reduces the pressure fluctuation of the oil cylinder, and has good reliability.

[0053] Furthermore, a first one-way overflow valve 9 is also provided on the one-way interface, and an overflow end of the first one-way overflow valve 9 is connected to the two-way interface.

[0054] The one-way relief valve is composed of a one-way valve and a relief valve in series. When lifting and unloading grain, it is convenient to guide the excess oil pressure on the first interface to the second interface for oil return, reducing the pressure fluctuation during the lifting process of the cylinder and having good stability.

[0055] Furthermore, a second one-way overflow valve 10 is provided on the two-way interface, and an overflow end of the second one-way overflow valve 10 is connected to the one-way interface.

[0056] When the grain tank returns to its original position, it is convenient to guide the excess oil pressure on the second-way interface to the first-way interface for oil return, reducing the pressure fluctuation during the oil cylinder retraction process and improving stability.

[0057] In the description of the present invention, it should be understood that if there are descriptive terms indicating orientation, direction or positional relationship, such as: "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the referred part, element or whole must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0058] In addition, if there are order description terms, such as "first", "second", etc., their purpose in this specification is to facilitate understanding or simplify description. For example, in order to distinguish multiple technical features of the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] In the present utility model, if the terms describing the relative functional relationship of the structures are used, such as "install", "connect", "connect", "fix", etc., they should be understood in a broad sense unless otherwise clearly specified and limited. For example, "install", "connect", "connect", etc. can be a fixed connection, a detachable connection, or an integrated one; can be a mechanical connection or an electrical connection; can be a direct connection or an indirect connection through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements; "fix" can be an integrated fixation or a detachable fixation through fasteners; can be a direct fixation or a fixation through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present utility model can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0060] In the present invention, if there are descriptive terms with subsidiary or connecting meanings, for example, a first feature is "on" or "below" a second feature, unless otherwise clearly specified and limited, it should not be understood in a restrictive manner. For example, "on" or "below" may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0061] Furthermore, the first feature being “above”, “above”, and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “below”, “below”, and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of the different embodiments and examples described in this specification without contradiction, and these combinations or combinations shall all fall within the scope summarized by the utility model.

[0063] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. A person skilled in the art can change, modify, replace and modify the above embodiments within the scope of information available from public channels and in combination with the technical inspiration provided by the present application documents.

Claims

1. A hydraulic system suitable for sequential action of corn machine oil cylinders, characterized by: The invention comprises a hydraulic pump (2), a lifting cylinder (4) and a tilting cylinder (5), wherein the outlet of the hydraulic pump (2) is connected to a multi-way valve (3); the multi-way valve (3) is provided with a one-way interface and a two-way interface, the one-way interface is provided with a first branch and a second branch, the first branch is connected to the extension end of the lifting cylinder (4), the second branch is connected to the extension end of the tilting cylinder (5), and the second branch is provided with a first sequence valve (6); the two-way interface is provided with a third branch and a fourth branch, the third branch is connected to the retraction end of the lifting cylinder (4), the third branch is provided with a second sequence valve (7), and the fourth branch is connected to the retraction end of the tilting cylinder (5).

2. The hydraulic system for sequential action of corn machine oil cylinders according to claim 1 is characterized in that: The first sequence valve (6) and the second sequence valve (7) are fixed differential pressure reducing valves.

3. The hydraulic system for sequential action of corn machine oil cylinders according to claim 1 is characterized in that: The multi-way valve (3) comprises an oil inlet (31), an oil return (32) and a three-position four-way solenoid valve (33); the hydraulic oil port of the three-position four-way solenoid valve (33) is connected to the oil inlet (31), the oil return port of the three-position four-way solenoid valve (33) is connected to the oil return (32), the first external interface of the three-position four-way solenoid valve (33) is the one-way interface, and the second external interface of the three-position four-way solenoid valve (33) is the two-way interface; the outlet of the hydraulic pump (2) is connected to the oil inlet (31) of the multi-way valve (3).

4. The hydraulic system for sequential action of corn machine cylinders according to claim 3 is characterized in that: It also comprises an oil tank (1), and the inlet of the hydraulic pump (2) and the oil return port of the three-position four-way solenoid valve (33) are both connected to the oil tank (1).

5. The hydraulic system for sequential action of corn machine oil cylinders according to claim 4 is characterized in that: The outlet of the hydraulic pump (2) is also connected to a filter (11).

6. The hydraulic system for sequential action of corn machine oil cylinders according to claim 3 is characterized in that: The multi-way valve (3) further comprises a pressure relief valve (34), the two ends of which are respectively connected to the oil inlet path (31) and the oil return path (32).

7. The hydraulic system for sequential action of corn machine oil cylinders according to claim 3 is characterized by: The multi-way valve (3) further comprises a safety valve (35), and two ends of the safety valve (35) are respectively connected to the oil inlet path (31) and the oil return path (32).

8. The hydraulic system for sequential action of corn machine oil cylinders according to claim 1 is characterized in that: A one-way throttle valve (8) is also provided on the first interface.

9. The hydraulic system for sequential action of corn machine oil cylinders according to claim 1 is characterized in that: The one-way interface is also provided with a first one-way overflow valve (9), and the overflow end of the first one-way overflow valve (9) is connected to the two-way interface.

10. The hydraulic system for sequential action of corn machine cylinders according to claim 1, characterized in that: A second one-way overflow valve (10) is also provided on the two-way interface, and the overflow end of the second one-way overflow valve (10) is connected to the one-way interface.

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