Hydraulic system and hydraulic valve for adjusting reel and harvester

Abstract

The utility model relates to the field of agricultural machinery, and discloses a hydraulic system for adjusting a reel, a hydraulic valve and a harvester. The main control valve is provided with a forward adjusting oil port, a reverse adjusting oil port, a main control valve oil inlet connected with the main oil inlet path and a main control valve oil return port connected with the main oil return path; the pressure compensation valve is provided with a compensation valve oil inlet connected with the main oil inlet path, a compensation valve oil outlet connected with the main oil return path, a first control oil port connected with the compensation valve oil inlet, and a second control oil port connected with the forward rotation adjusting oil port and the reverse rotation adjusting oil port; the first control oil port and the second control oil port are used for jointly controlling the opening degree of the pressure compensation valve; and an oil inlet of the overflow valve is directly connected with the main oil inlet path, and an oil outlet of the overflow valve is directly connected with the main oil return path. The hydraulic system can be effectively prevented from building pressure, components in the hydraulic system are prevented from being damaged, and therefore the safety and reliability of the hydraulic system are effectively improved.

Description

Technical Field

[0001] This application belongs to the technical field of agricultural machinery, and particularly relates to a hydraulic system for adjusting a reel, a hydraulic valve for adjusting a reel, and a harvester. Background Art

[0002] The reel device on the cutting table of a harvester mainly functions to support and guide the harvested crops to smoothly enter the cutting table. Under different conditions such as the type, height, density, and yield of the crops, generally different requirements for the reel speed are needed. This requires frequently adjusting the reel speed when the harvester harvests crops. Currently, the hydraulic control method for the reel speed has become common, but there is still much room for improvement in the safety and reliability of the existing hydraulic system for controlling the reel. Summary of the Utility Model

[0003] The purpose of this application is to provide a hydraulic system, a hydraulic valve, and a harvester for adjusting a reel, which can effectively prevent the hydraulic system from being blocked by pressure, thereby improving the safety and reliability of the hydraulic system.

[0004] To achieve the above purpose, on the one hand, this application provides a hydraulic system for adjusting a reel, which includes:

[0005] A main inlet oil circuit and a main return oil circuit;

[0006] A main control valve, provided with a forward rotation adjustment oil port, a reverse rotation adjustment oil port, a main control valve inlet oil port connected to the main inlet oil circuit, and a main control valve return oil port connected to the main return oil circuit. The main control valve includes a first conduction state and a second conduction state. In the first conduction state, the main control valve inlet oil port is in communication with the forward rotation adjustment oil port and the main control valve return oil port is in communication with the reverse rotation adjustment oil port. In the second conduction state, the main control valve inlet oil port is in communication with the reverse rotation adjustment oil port and the main control valve return oil port is in communication with the forward rotation adjustment oil port;

[0007] A pressure compensation valve, provided with a compensation valve inlet oil port connected to the main inlet oil circuit, a compensation valve outlet oil port connected to the main return oil circuit, a first control oil port connected to the compensation valve inlet oil port, and a second control oil port connected to the forward rotation adjustment oil port and the reverse rotation adjustment oil port. The first control oil port and the second control oil port are used to jointly control the opening degree of the pressure compensation valve; and

[0008] An overflow valve, the inlet oil port of the overflow valve is directly connected to the main inlet oil circuit, and the outlet oil port of the overflow valve is directly connected to the main return oil circuit.

[0009] In some embodiments, a filtering device is provided at the inlet oil port of the main inlet oil circuit.

[0010] In some embodiments, a back pressure valve is provided in the main oil return circuit. The oil inlet of the back pressure valve is connected to the oil return port of the main control valve, and the oil outlet of the back pressure valve is connected to the oil outlet of the compensation valve.

[0011] In some embodiments, the back pressure valve is a spring-loaded one-way valve.

[0012] In some embodiments, the hydraulic system further includes an oil return control valve connected between the main oil inlet circuit and the main oil return circuit in a switchable on-off state.

[0013] In some embodiments, the oil return control valve is a two-position two-way solenoid valve.

[0014] In some embodiments, the hydraulic system further includes a shuttle valve. The shuttle valve includes a first shuttle valve oil inlet connected to the forward rotation adjustment oil port, a second shuttle valve oil inlet connected to the reverse rotation adjustment oil port, and a shuttle valve oil outlet connected to the second control oil port.

[0015] In some embodiments, the main control valve is a three-position four-way electro-hydraulic proportional directional valve.

[0016] The second aspect of the present application further provides a hydraulic valve for adjusting a reel. The hydraulic valve integrates the above-mentioned hydraulic system for adjusting a reel.

[0017] The third aspect of the present application further provides a harvester, which includes the above-mentioned hydraulic system for adjusting a reel, or includes the above-mentioned hydraulic valve for adjusting a reel.

[0018] By adopting the hydraulic system for adjusting a reel of the present application, when the main control valve is in the first conduction state, the main oil inlet circuit can supply oil to the forward rotation motor of the reel through the main control valve, so that the forward rotation motor of the reel drives the reel to rotate forward. When the main control valve is in the second conduction state, the main oil inlet circuit can supply oil to the reverse rotation motor of the reel through the main control valve, so that the reverse rotation motor of the reel drives the reel to rotate in reverse. When the oil pressure in the main oil inlet circuit exceeds the required range of the oil inlet pressure of the reel motor, the pressure compensation valve can jointly control its own opening degree through the first control oil port and the second control oil port to adjust the oil pressure in the main oil inlet circuit back to the required range of the oil inlet pressure of the reel motor. When the spool of the pressure compensation valve is stuck and cannot relieve pressure, the main oil inlet circuit can directly relieve pressure to the main oil return circuit through the overflow valve, effectively preventing the hydraulic system from being blocked, avoiding damage to the components in the hydraulic system, and thus effectively improving the safety and reliability of the hydraulic system.

[0019] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific embodiment part. Description of the Drawings

[0020] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and form a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation to the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings. In the drawings:

[0021] Figure 1 It is a schematic diagram of a hydraulic system for adjusting a reel in a specific embodiment of the present application.

[0022] Explanation of reference numerals

[0023] 1 Hydraulic valve 2 Filter device

[0024] 3 Relief valve 4 Return oil control valve

[0025] 5 Pressure compensation valve 6 Main control valve

[0026] 7 Shuttle valve 8 Back pressure valve Specific embodiments

[0027] The following will describe in detail the specific embodiments of the present application with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0028] Refer to Figure 1 , a first exemplary embodiment of the present application provides a hydraulic system for adjusting a reel, and the hydraulic system includes:

[0029] A main inlet oil circuit and a main return oil circuit;

[0030] The main control valve 6 is provided with a forward rotation adjustment oil port A1 (for connecting to the inlet oil port A of the reel forward rotation motor), a reverse rotation adjustment oil port B1 (for connecting to the inlet oil port B of the reel reverse rotation motor), a main control valve inlet oil port P4 connected to the main inlet oil circuit, and a main control valve return oil port T4 connected to the main return oil circuit. The main control valve 6 includes a first conduction state and a second conduction state; in the first conduction state, the main control valve inlet oil port P4 is in communication with the forward rotation adjustment oil port A1 and the main control valve return oil port T4 is in communication with the reverse rotation adjustment oil port B1; in the second conduction state, the main control valve inlet oil port P4 is in communication with the reverse rotation adjustment oil port B1 and the main control valve return oil port T4 is in communication with the forward rotation adjustment oil port A1;

[0031] The pressure compensation valve 5 is provided with a compensation valve inlet oil port P3 connected to the main inlet oil circuit, a compensation valve outlet oil port T2 connected to the main return oil circuit, a first control oil port K connected to the compensation valve inlet oil port P3, and a second control oil port F connected to the forward rotation adjustment oil port A1 and the reverse rotation adjustment oil port B1. The first control oil port K and the second control oil port F are used to jointly control the opening degree of the pressure compensation valve 5; and

[0032] The overflow valve 3 has its oil inlet directly connected to the main inlet oil path and its oil outlet directly connected to the main return oil path.

[0033] By adopting the hydraulic system of the present application, when the main control valve 6 is in the first conduction state (P4 is conducted with A1, and T4 is conducted with B1), the hydraulic oil flowing in from the oil inlet P of the main inlet oil path (usually connected to the fuel tank) can supply oil to the forward rotation motor of the reel through the main control valve 6, so that the forward rotation motor of the reel drives the reel to rotate forward. At the same time, the hydraulic oil in the reverse rotation motor of the reel can flow back to the main return oil path through the main control valve 6 and flow out from the oil outlet T of the main return oil path (usually connected to the fuel tank).

[0034] When the main control valve 6 is in the second conduction state (P4 is conducted with B1, and T4 is conducted with A1), the hydraulic oil flowing in from the oil inlet P of the main inlet oil path can supply oil to the reverse rotation motor of the reel through the main control valve 6, so that the reverse rotation motor of the reel drives the reel to rotate in reverse. At the same time, the hydraulic oil in the forward rotation motor of the reel can flow back to the main return oil path through the main control valve 6 and flow out from the oil outlet T of the main return oil path.

[0035] When the oil pressure in the main inlet oil path exceeds the required range of the oil inlet pressure of the reel motor (the oil pressure at the oil inlets A or B), the pressure compensation valve 5 can jointly control its own opening degree through the first control oil port K and the second control oil port F to adjust the oil pressure in the main inlet oil path back to the required range of the oil inlet pressure of the reel motor.

[0036] Specifically, when the oil pressure in the main inlet oil path is greater than the upper threshold of the required range of the oil inlet pressure of the reel motor, the pressure at the first control oil port K of the pressure compensation valve 5 increases, which can push the spool of the pressure compensation valve 5 to move towards the second control oil port F to increase the opening degree of the pressure compensation valve 5. Thus, the main inlet oil path can discharge more hydraulic oil to the main return oil path through the pressure compensation valve 5, thereby adjusting the oil pressure in the main inlet oil path back to the required range of the oil inlet pressure of the reel motor.

[0037] When the oil pressure in the main inlet oil path is less than the lower threshold of the required range of the oil inlet pressure of the reel motor, the pressure at the first control oil port K of the pressure compensation valve 5 decreases, and the spool of the pressure compensation valve 5 moves towards the first control oil port K to reduce the opening degree of the pressure compensation valve 5. Thus, the oil volume flowing through the main inlet oil path through the pressure compensation valve 5 decreases, and the oil volume flowing from the main inlet oil path through the main control valve 6 to the reel motor increases, thereby adjusting the oil pressure in the main inlet oil path back to the required range of the oil inlet pressure of the reel motor.

[0038] In addition, when the spool of the pressure compensation valve 5 gets stuck (for example, the spool gets stuck due to dust in the working environment of the harvester blocking the spool or the spool being damaged, etc.), resulting in the inability to relieve pressure, the main inlet oil circuit can directly relieve pressure to the main return oil circuit through the overflow valve 3 (that is, P, P1, and T are connected to achieve pressure relief), thereby effectively preventing the hydraulic system from being blocked by pressure and avoiding damage to the components in the hydraulic system, and further effectively improving the safety and reliability of the hydraulic system.

[0039] In some embodiments, a filtering device 2 is provided at the oil inlet of the main inlet oil circuit. For example, the filtering device 2 can adopt different types of structures such as a filter screen (the filtering accuracy can be set to 100μm). By providing this filtering device 2, large external particles can be prevented from entering the hydraulic system and causing the spools of various valves to get stuck, thereby effectively reducing the risk of spool sticking and improving the environmental adaptability of the hydraulic system.

[0040] In some embodiments, a back pressure valve 8 is provided in the main return oil circuit. The oil inlet of the back pressure valve 8 is connected to the oil return port T4 of the main control valve, and the oil outlet T3 of the back pressure valve 8 is connected to the oil outlet T2 of the compensation valve. By providing the back pressure valve 8, when the oil inlet A of the reel forward motor is in communication with the oil return port T4 of the main control valve, a certain oil return pressure will be formed at the oil inlet A of the reel forward motor. Similarly, when the oil inlet B of the reel reverse motor is in communication with the oil return port T4 of the main control valve, due to the presence of the back pressure valve 8, a certain oil return pressure will also be formed at the oil inlet B, which is beneficial to the lubrication and heat dissipation of the reel motor, reduces motor wear, and thus extends its service life.

[0041] In some embodiments, the hydraulic system further includes an oil return control valve 4 connected between the main inlet oil circuit and the main return oil circuit. Specifically, the oil inlet P2 of the oil return control valve 4 is connected to the main inlet oil circuit, the oil outlet T1 of the oil return control valve 4 is connected to the main return oil circuit, and the oil return control valve 4 can switch its on-off state (that is, the on-off state of P2 and T1).

[0042] When the hydraulic system needs to drive the reel motor to operate, the oil return control valve 4 can be switched to the cut-off conduction state (at this time, P2 and T1 are not in communication), ensuring that the main inlet oil circuit has sufficient oil pressure to supply to the reel motor. When it is not necessary to drive the reel motor to operate, the oil return control valve 4 can be switched to the conduction state (at this time, P2 and T1 are in communication). At this time, the hydraulic oil in the main inlet oil circuit can directly flow back to the main return oil circuit through the oil return control valve 4 without returning through the pressure compensation valve 5, thereby reducing the oil return resistance and reducing the energy loss of the hydraulic system.

[0043] In some embodiments, the hydraulic system further includes a shuttle valve 7, which includes a first shuttle valve inlet connected to the forward rotation regulating oil port A1, a second shuttle valve inlet connected to the reverse rotation regulating oil port B1, and a shuttle valve outlet E connected to the second control oil port F. At this time, the one with the higher oil pressure in the first shuttle valve inlet and the second shuttle valve inlet can act on the second control oil port F of the pressure compensation valve 5 through the shuttle valve outlet E.

[0044] Finally, it should be noted that referring to Figure 1 , the main control valve 6 can adopt a three-position four-way electro-hydraulic proportional reversing valve. At this time, when the control end Y1 of the main control valve 6 is energized, the main control valve 6 switches to the first conduction state (P4 is conducted with A1, and T4 is conducted with B1). When the control end Y2 of the main control valve 6 is energized, the main control valve 6 switches to the second conduction state (P4 is conducted with B1, and T4 is conducted with A1). By inputting an electro-hydraulic proportional signal to the main control valve 6, the opening degree of the main control valve 6 can be controlled, and further the oil volume flowing into the reel motor can be controlled to achieve the adjustment of the motor speed.

[0045] In addition, referring to Figure 1 , the oil return control valve 4 can adopt a two-position two-way solenoid valve. At this time, when the control end Y0 of the oil return control valve 4 is de-energized, the oil return control valve 4 is in the conducting state (i.e., P2 is conducted with T1). When the control end Y0 of the oil return control valve 4 is energized, the oil return control valve 4 is in the cut-off conducting state (i.e., P2 is not conducted with T1).

[0046] Furthermore, the back pressure valve 8 can adopt a spring-loaded one-way valve.

[0047] Of course, valves such as the main control valve 6, the oil return control valve 4, and the back pressure valve 8 are not limited to the above valve types, as long as they can achieve the corresponding functions. The present application does not limit the specific valve type selection.

[0048] The second exemplary embodiment of the present application further provides a hydraulic valve 1 for adjusting the reel. The hydraulic system for adjusting the reel described above is integrated in the hydraulic valve 1. By integrating the above hydraulic system into a hydraulic valve 1, it is beneficial to reduce the size of the hydraulic system, save the installation space, and facilitate disassembly and assembly.

[0049] The third exemplary embodiment of the present application further provides a harvester, which includes the above-mentioned hydraulic system for adjusting the reel, or includes the above-mentioned hydraulic valve for adjusting the reel.

[0050] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0051] In the present application, unless otherwise clearly defined and limited, terms such as "installed", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0052] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0053] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A hydraulic system for adjusting a reel, characterized in that: The hydraulic system comprises: Main oil inlet circuit and main oil return circuit; A main control valve (6) is provided with a forward regulating oil port, a reverse regulating oil port, a main control valve oil port connected to the main oil inlet oil circuit, and a main control valve oil return port connected to the main oil return oil circuit, wherein the main control valve (6) comprises a first conducting state and a second conducting state, wherein in the first conducting state, the main control valve oil port is connected to the forward regulating oil port and the main control valve oil return port is connected to the reverse regulating oil port, and in the second conducting state, the main control valve oil port is connected to the reverse regulating oil port and the main control valve oil return port is connected to the forward regulating oil port; a pressure compensating valve (5) having a compensating valve oil inlet connected to the main oil inlet oil circuit, a compensating valve oil outlet connected to the main oil return oil circuit, a first control oil port connected to the compensating valve oil inlet, and a second control oil port connected to the forward regulating oil port and the reverse regulating oil port, wherein the first control oil port and the second control oil port are used to jointly control the opening of the pressure compensating valve (5); and A relief valve (3), wherein the oil inlet of the relief valve (3) is directly connected to the main oil inlet oil circuit, and the oil outlet of the relief valve (3) is directly connected to the main oil return oil circuit.

2. The hydraulic system for adjusting a reel according to claim 1, characterized in that: A filtering device (2) is provided at the oil inlet of the main oil inlet circuit.

3. The hydraulic system for adjusting a reel according to claim 1, characterized in that: A back pressure valve (8) is provided in the main oil return oil circuit, the oil inlet of the back pressure valve (8) is connected to the oil return port of the main control valve, and the oil outlet of the back pressure valve (8) is connected to the oil outlet of the compensation valve.

4. The hydraulic system for adjusting a reel according to claim 3, characterized in that: The back pressure valve (8) is a spring-type one-way valve.

5. The hydraulic system for adjusting a reel according to claim 1, characterized in that: The hydraulic system further comprises an oil return control valve (4) which is connected between the main oil inlet circuit and the main oil return circuit in a switchable on / off state.

6. The hydraulic system for adjusting a reel according to claim 5, characterized in that: The oil return control valve (4) is a two-position two-way solenoid valve.

7. The hydraulic system for adjusting a reel according to claim 1, characterized in that: The hydraulic system further comprises a shuttle valve (7), wherein the shuttle valve (7) comprises a first shuttle valve oil inlet connected to the forward regulating oil port, a second shuttle valve oil inlet connected to the reverse regulating oil port, and a shuttle valve oil outlet connected to the second control oil port.

8. The hydraulic system for adjusting a reel according to claim 1, characterized in that: The main control valve (6) is a three-position, four-way, electrically proportional directional valve.

9. A hydraulic valve for adjusting a reel, characterized in that: The hydraulic valve (1) has integrated therein a hydraulic system for adjusting a reel according to any one of claims 1 to 8.

10. A harvester, characterized in that: The harvester comprises the hydraulic system for adjusting the reel according to any one of claims 1 to 8, or comprises the hydraulic valve for adjusting the reel according to claim 9.

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