A hydraulic control system, material box turnover mechanism and corn harvester

Abstract

This utility model relates to a hydraulic control system, a material box tipping mechanism, and a corn harvester, specifically in the field of corn harvesters. In the hydraulic control system, the reversing return port of an electrically controlled directional valve is connected to the inlet of a second electrically controlled switching valve. The first working port of the electrically controlled directional valve is connected to the rod chamber of the material box cylinder via a first working pipeline, and the second working port is connected to the rodless chamber of the material box cylinder via a second working pipeline. A check valve allows unidirectional flow between the first and second working pipelines. The electrically controlled directional valve can be switched so that the reversing inlet is connected to the second working port and the first working port is connected to the reversing return port, or vice versa. The beneficial effects of this utility model are: by utilizing a check valve and a second electrically controlled switching valve, rapid oil intake is achieved without changing the existing oil pump displacement, increasing the tipping speed of the material box cylinder and improving operating efficiency.

Description

Technical Field

[0001] This utility model relates to the field of corn harvesters, specifically to a hydraulic control system, a material box tipping mechanism, and a corn harvester. Background Technology

[0002] Agricultural harvesting machinery is being used more and more widely, and the demand for its functions is also increasing. Among them, corn harvesters are machines used to complete various harvesting processes when corn is ripe, based on planting methods and agronomic requirements. These processes include cutting corn stalks, picking ears, peeling, threshing, straw processing, and post-harvest tillage. During harvesting, the harvested material is stored in a material bin. When the bin is full, a hydraulic cylinder rotates the bin around a shaft, transferring the material to a collection vehicle.

[0003] To improve operational efficiency, hydraulic cylinders need to ensure rapid extension and retraction speeds. Current methods to increase hydraulic cylinder speed include: 1. Increasing the displacement of the gear pump to provide more flow at the same speed, thus accelerating cylinder extension and retraction. However, corn harvester hydraulic systems generally require gear pumps to provide hydraulic energy for multiple operations. For most operations, a large flow is not needed, necessitating a throttle valve to control the speed. A large amount of flow returns to the oil tank from the relief valve, resulting in energy waste. 2. Adopting a dual-pump confluence scheme, combining the flow from the other pumps to the material tank hydraulic cylinder. However, this scheme requires additional switching valves and complex piping.

[0004] The purpose of this invention is to increase the tilting speed of the hydraulic cylinder of the material box without changing the displacement of the existing gear pump, thereby improving work efficiency. Utility Model Content

[0005] The technical problem to be solved by this utility model is how to improve the speed of the material box flipping action.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A hydraulic control system includes an oil pump, a check valve, a material box cylinder, an electrically controlled directional valve, and a second electrically controlled switching valve. The oil pump is connected to the reversing inlet of the electrically controlled directional valve through a main oil inlet pipeline. The reversing return port of the electrically controlled directional valve is connected to the inlet of the second electrically controlled switching valve. The outlet of the second electrically controlled switching valve is connected to the main return pipeline. The first working port of the electrically controlled directional valve is connected to the material box cylinder through a first working pipeline. The rod chamber is connected, and the second working port of the electrically controlled directional valve is connected to the rodless chamber of the material box cylinder through the second working pipeline. The inlet of the one-way valve is connected to the first working pipeline, and the outlet of the one-way valve is connected to the second working pipeline, so that the first working pipeline and the second working pipeline are connected in one direction. The electrically controlled directional valve can be switched to connect the directional inlet to the second working port and the first working port to the directional return port, or connect the directional inlet to the first working port and the second working port to the directional return port.

[0007] The beneficial effects of this utility model are: by utilizing a one-way valve and a second electrically controlled switch valve, rapid oil intake can be achieved without changing the existing oil pump displacement, thereby increasing the speed of the material box cylinder's tilting action and improving work efficiency.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the material box cylinder is provided with at least two cylinders, and the first working pipeline is connected to the rod chamber of at least two of the material box cylinders respectively, and the second working pipeline is connected to the rodless chamber of at least two of the material box cylinders respectively.

[0010] The beneficial effects of adopting the above-mentioned further scheme are: at least two material box cylinders are used simultaneously to drive the material box to flip, resulting in a large force, uniform force on the material box, and rapid action.

[0011] Furthermore, the material box cylinder is provided with two cylinders.

[0012] Furthermore, hydraulic locks are also installed on the first working pipeline and the second working pipeline.

[0013] Furthermore, the electronically controlled directional valve can be switched so that both the first working port and the second working port are connected to the directional return oil port.

[0014] The beneficial effect of adopting the above-mentioned further solution is that when the material box is not working, the electrically controlled reversing valve switches to the first working port and the second working port, both of which are connected to the reversing return oil port.

[0015] Furthermore, the hydraulic control system also includes a safety valve, the inlet of which is connected to the main oil inlet line, and the outlet of which is connected to the main oil return line.

[0016] The beneficial effect of adopting the above-mentioned further solution is that when the oil pressure in the main inlet pipeline is too high, the hydraulic oil overflows from the safety valve to the main return pipeline.

[0017] Furthermore, the hydraulic control system also includes a first electrically controlled switching valve, the inlet of which is connected to the main oil inlet pipeline, and the outlet of which is connected to the main oil return pipeline.

[0018] The beneficial effect of adopting the above-mentioned further scheme is that when the material box is not working, the first electrically controlled switch valve connects the main oil inlet pipeline and the main oil return pipeline, and the oil pump output flow is unloaded through the first electrically controlled switch valve and returns to the hydraulic oil tank.

[0019] Furthermore, a filter is installed on the main oil inlet pipeline at the outlet of the oil pump.

[0020] This utility model also provides a material box tilting mechanism, including the aforementioned hydraulic control system.

[0021] This utility model also provides a corn harvester, including the aforementioned hydraulic control system. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the hydraulic control system of this utility model.

[0023] The attached diagram lists the components represented by each number as follows: 1. Hydraulic oil tank; 2. Oil pump; 3. Filter; 4. Safety valve; 5. First electrically controlled switch valve; 6. Check valve; 7. Material box cylinder; 8. Hydraulic lock; 9. Electrically controlled directional valve; 10. Second electrically controlled switch valve. Detailed Implementation

[0024] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0025] Example 1 like Figure 1As shown, this embodiment provides a hydraulic control system, including an oil pump 2, a check valve 6, a material tank cylinder 7, an electrically controlled directional valve 9, and a second electrically controlled switching valve 10. The oil pump 2 is connected to the reversing inlet of the electrically controlled directional valve 9 via a main inlet pipeline. The reversing return port of the electrically controlled directional valve 9 is connected to the inlet of the second electrically controlled switching valve 10. The outlet of the second electrically controlled switching valve 10 is connected to the main return pipeline. The first working port of the electrically controlled directional valve 9 is connected to the rod chamber of the material tank cylinder 7 via a first working pipeline. The second working port of the electrically controlled directional valve 9 is connected to the rodless chamber of the material tank cylinder 7 via a second working pipeline. The inlet of the check valve 6 is connected to the first working pipeline, and the outlet of the check valve 6 is connected to the second working pipeline, allowing unidirectional flow from the first working pipeline to the second working pipeline. The electrically controlled directional valve 9 can be switched so that its reversing inlet is connected to the second working port, and its first working port is connected to the reversing return port (e.g., ...). Figure 1 As shown, the electronically controlled directional valve 9 is in the left position), or the directional inlet is connected to the first working port, and the second working port is connected to the directional return port (e.g. Figure 1 As shown, the electronically controlled directional valve 9 is in the right position.

[0026] By utilizing the one-way valve 6 and the second electrically controlled switch valve 10, rapid oil intake is achieved without changing the displacement of the existing oil pump 2, thereby increasing the speed of the material box cylinder 7's tilting action and improving operational efficiency.

[0027] Specifically, oil pump 2 is a gear pump, but it can also be other types of hydraulic pumps.

[0028] Specifically, such as Figure 1 As shown, the hydraulic port at the lower left of the electronically controlled directional valve 9 is the directional inlet, the hydraulic port at the lower right is the directional return port, the hydraulic port at the upper left is the first working port, and the hydraulic port at the upper right is the second working port. The electromagnetic control terminals on both sides are denoted as a1 and b1, respectively.

[0029] Specifically, the second electrically controlled switch valve 10 can be switched to have its inlet connected to its outlet (left position) or disconnected (right position). The electromagnetic control terminal of the second electrically controlled switch valve 10 is denoted as b2.

[0030] Specifically, the inlet of oil pump 2 and the main return oil line are both connected to hydraulic oil tank 1.

[0031] The working principle of the hydraulic control system is as follows: 1. When the material box is tilted for unloading, the b1 of the electrically controlled directional valve 9 is energized, and the electrically controlled directional valve 9 is in the leftmost position; the b2 of the second electrically controlled switch valve 10 is energized, and the second electrically controlled switch valve 10 is in the right position. Hydraulic oil enters the rodless chamber of the material box cylinder 7 through the oil pump 2 and the left position of the electrically controlled directional valve 9, and the material box begins to tilt. Since the second electrically controlled switch valve 10 is in the right position at this time, the hydraulic oil in the rod chamber of the material box cylinder 7 cannot return to the hydraulic oil tank 1, which causes the hydraulic pressure in the rod chamber of the material box cylinder 7 to increase, causing the check valve 6 to open. The hydraulic oil in the material box cylinder 7 enters the rodless chamber through the check valve 6, thereby greatly increasing the extension speed of the material box cylinder 7.

[0032] 2. When the material box returns to its original position, valve a1 of the electrically controlled directional valve 9 is energized, and valve 9 is in its rightmost position; valve b2 of the second electrically controlled switch valve 10 is de-energized, and valve 10 is in its left position. Hydraulic oil enters the rod chamber of the material box cylinder 7 through oil pump 2 and the right-hand position of the electrically controlled directional valve 9; since the second electrically controlled switch valve 10 is in its left position at this time, the hydraulic oil in the rodless chamber of the material box cylinder 7 returns to the oil tank through the left-hand position of the second electrically controlled switch valve 10, thus completing the material box's return action.

[0033] Based on the above technical solution, the material box cylinder 7 is provided with at least two cylinders, the first working pipeline is connected to the rod chamber of at least two material box cylinders 7 respectively, and the second working pipeline is connected to the rodless chamber of at least two material box cylinders 7 respectively.

[0034] At least two material box cylinders 7 are used simultaneously to drive the material box to flip, resulting in a large force, uniform force distribution on the material box, and rapid action.

[0035] Optionally, three, four or more material box cylinders 7 can be connected in parallel as needed.

[0036] In one specific example, the material box cylinder 7 is provided in two.

[0037] Based on the above technical solution, a hydraulic lock 8 is also provided on the first working pipeline and the second working pipeline.

[0038] Based on the above technical solution, the electronically controlled reversing valve 9 can also be switched so that both the first working port and the second working port are connected to the reversing return oil port.

[0039] When the material box is not working, the electrically controlled reversing valve 9 switches to connect both the first and second working ports to the reversing return oil port. Figure 1 As shown, the electrically controlled directional valve 9 is in the neutral position at this time.

[0040] Based on the above technical solution, the hydraulic control system also includes a safety valve 4, the inlet of which is connected to the main oil inlet pipeline, and the outlet of which is connected to the main oil return pipeline.

[0041] When the oil pressure in the main inlet line is too high, the hydraulic oil overflows from safety valve 4 to the main return line.

[0042] Based on the above technical solution, the hydraulic control system also includes a first electrically controlled switching valve 5, the inlet of which is connected to the main oil inlet pipeline, and the outlet of which is connected to the main oil return pipeline.

[0043] When the material box is not working, the first electrically controlled switch valve 5 connects the main oil inlet pipeline and the main oil return pipeline, and the output flow of the oil pump 2 is unloaded through the first electrically controlled switch valve 5 and returns to the hydraulic oil tank 1.

[0044] Specifically, the first electrically controlled switch valve 5 can be switched to have its inlet connected to its outlet (left position) or disconnected (right position). The electromagnetic control terminal of the first electrically controlled switch valve 5 is denoted as b0.

[0045] In one specific example, the safety valve 4, the first electrically controlled switch valve 5, the hydraulic lock 8, the electrically controlled directional valve 9, and the second electrically controlled switch valve 10 are integrated in the hydraulic valve block. The main oil inlet line forms a P port on the hydraulic valve block, the main oil return line forms a T port on the hydraulic valve block, the first working line forms an A1 port on the hydraulic valve block, and the second working line forms a B1 port on the hydraulic valve block.

[0046] Based on the above technical solution, a filter 3 is provided on the main oil inlet pipeline at the outlet of the oil pump 2.

[0047] The working principle of the hydraulic control system in this embodiment is as follows: 1. When the material box is tilted for unloading, the first solenoid valve 5 (b0) is energized, and the first solenoid valve 5 is in the right position. The solenoid directional valve 9 (b1) is energized, and the solenoid directional valve 9 is in the leftmost position; the second solenoid valve 10 (b2) is energized, and the second solenoid valve 10 is in the right position. Hydraulic oil passes through the oil pump 2, filter 3, the left position of the solenoid directional valve 9, and the hydraulic lock 8 into the rodless chamber of the material box cylinder 7, and the material box begins to tilt. Since the second solenoid valve 10 is in the right position at this time, the hydraulic oil in the rod chamber of the material box cylinder 7 cannot return to the hydraulic oil tank 1, causing the hydraulic pressure in the rod chamber of the material box cylinder 7 to increase, which opens the check valve 6. The hydraulic oil in the material box cylinder 7 enters the rodless chamber through the check valve 6, thereby greatly increasing the extension speed of the material box cylinder 7.

[0048] 2. When the material box returns to its original position, the first solenoid valve 5 (b0) is energized, placing it in the right position. The solenoid directional valve 9 (a1) is energized, placing it in the far right position. The second solenoid valve 10 (b2) is de-energized, placing it in the left position. Hydraulic oil passes through the oil pump 2, filter 3, the right-position solenoid valve 9, and the hydraulic lock 8, entering the rod chamber of the material box cylinder 7. Since the second solenoid valve 10 is in the left position, the hydraulic oil in the rodless chamber of the material box cylinder 7 returns to the oil tank through the left-position second solenoid valve 10, thus completing the material box's return action.

[0049] 3. When the material box is not working, there is no signal from either of the solenoid coils at both ends of the electrically controlled directional valve 9, and the valve core is in the middle position. At this time, the output flow of the oil pump 2 enters through port P, passes through the left-position unloading of the first electrically controlled switch valve 5, and flows out through port T back to the hydraulic oil tank 1. During this process, the system is in an unloading state.

[0050] Example 2 This embodiment provides a material box tipping mechanism, including the hydraulic control system described in Embodiment 1.

[0051] Specifically, the material box tilting mechanism includes a material box that is rotatably mounted on a bracket, one end of the material box cylinder is hinged to the material box, and the other end of the material box cylinder is hinged to the bracket.

[0052] Example 3 This embodiment provides a corn harvester, including the hydraulic control system described in Embodiment 1.

[0053] It should be noted that the terms "left position" or "right position" used in this embodiment are based on Figure 1 The valve positions shown are described in the diagram. It is understood that the positional relationships of each valve position can be interchanged. For example, the left and right positions of the second electrically controlled switch valve 10 can be interchanged. The change of valve position does not affect the realization of the above-mentioned hydraulic function. Therefore, these variations should all be included within the protection scope of this utility model.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic control system, characterized in that, The system includes an oil pump (2), a check valve (6), a material tank cylinder (7), an electrically controlled directional valve (9), and a second electrically controlled switch valve (10). The oil pump (2) is connected to the directional inlet of the electrically controlled directional valve (9) via a main oil inlet pipeline. The directional return port of the electrically controlled directional valve (9) is connected to the inlet of the second electrically controlled switch valve (10). The outlet of the second electrically controlled switch valve (10) is connected to the main return pipeline. The first working port of the electrically controlled directional valve (9) is connected to the rod chamber of the material tank cylinder (7) via a first working pipeline. The second working port of the electrically controlled directional valve (9) is connected to the rodless chamber of the material box cylinder (7) through the second working pipeline. The inlet of the one-way valve (6) is connected to the first working pipeline, and the outlet of the one-way valve (6) is connected to the second working pipeline, so that the first working pipeline to the second working pipeline is unidirectionally connected. The electrically controlled directional valve (9) can be switched to connect the directional inlet to the second working port and the first working port to the directional return port, or connect the directional inlet to the first working port and the second working port to the directional return port.

2. A hydraulic control system according to claim 1, characterized in that, The material box cylinder (7) is provided with at least two cylinders. The first working pipeline is connected to the rod chamber of at least two material box cylinders (7) respectively, and the second working pipeline is connected to the rodless chamber of at least two material box cylinders (7) respectively.

3. A hydraulic control system according to claim 2, characterized in that, The material box cylinder (7) is provided in two parts.

4. A hydraulic control system according to claim 1, characterized in that, Hydraulic locks (8) are also provided on the first working pipeline and the second working pipeline.

5. A hydraulic control system according to claim 1, characterized in that, The electronically controlled reversing valve (9) can also be switched so that both the first working port and the second working port are connected to the reversing return oil port.

6. A hydraulic control system according to claim 1, characterized in that, It also includes a safety valve (4), the inlet of which is connected to the main oil inlet pipeline, and the outlet of which is connected to the main oil return pipeline.

7. A hydraulic control system according to claim 1, characterized in that, It also includes a first electrically controlled switch valve (5), the inlet of which is connected to the main oil inlet pipeline, and the outlet of which is connected to the main oil return pipeline.

8. A hydraulic control system according to any one of claims 1-7, characterized in that, A filter (3) is installed on the main oil inlet pipeline at the outlet of the oil pump (2).

9. A material box flipping mechanism, characterized in that, Including the hydraulic control system as described in any one of claims 1-8.

10. A corn harvester, characterized in that, Including the hydraulic control system as described in any one of claims 1-8.

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