A hydraulic unloading system and unloading structure for a grain ear box

Abstract

This invention relates to the field of grain unloading technology for harvester ear boxes, and particularly to a hydraulic unloading system and structure for harvester ear boxes. The hydraulic unloading system includes a hydraulic pump connected to the harvester's oil tank; an electromagnetic multi-way valve connecting the hydraulic pump and the oil tank; a deflection cylinder connected to the electromagnetic multi-way valve via a first oil circuit; a first sequence valve connected to the first oil circuit; a first directional valve connected to the first sequence valve and the electromagnetic multi-way valve; a lifting cylinder connected to the first directional valve and connected to the deflection cylinder via a second oil circuit; a tilting cylinder connected to the first directional valve and connected to the deflection cylinder via a second oil circuit; a second sequence valve located on the second oil circuit and connected to the first directional valve; a limit sensor; and a controller electrically connected to the limit sensor. This hydraulic unloading system and structure for harvester ear boxes solve the problem of safely and cost-effectively adjusting the unloading height of the harvester ear box.

Description

Technical Field

[0001] This application relates to the field of grain unloading technology for grain boxes, and in particular to a grain unloading hydraulic system and a grain unloading structure for grain boxes. Background Technology

[0002] The stalk-and-ear corn harvester can harvest both corn ears and stalks simultaneously, significantly improving the diversity and economic benefits of material harvesting. In recent years, it has experienced rapid development and widespread application in my country. The ear box, a key component of the stalk-and-ear corn harvester, is mainly used to load the harvested corn ears and transfer them to the grain receiving vehicle. Specifically, the harvester uses belts or material rollers to transport the corn ears to the ear box for storage. When the ear box is full, a hydraulic cylinder pushes it to tilt, thereby transferring the harvested corn to the grain receiving vehicle.

[0003] However, the height of grain receiving vehicles on the market varies, and existing harvesters are not equipped with the function of adjusting the height of the ear box. When the grain receiving vehicle is too high, the ear box cannot smoothly transfer the corn ears into the vehicle, which greatly limits the harvester's working efficiency. If three sets of three-position four-way reversing valves are used to control three sets of hydraulic cylinders to achieve coordinated movement, and limit sensors are installed on each set of hydraulic cylinders to monitor whether the ear box movement is in place, it will increase the complexity and cost of the system. Moreover, multi-sensor control is prone to sensor failure, leading to abnormal operation and thus safety issues. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a hydraulic unloading system and an unloading structure for a harvester ear box, so as to solve the problem of how to safely and cost-effectively adjust the unloading height of the harvester ear box.

[0005] According to a first aspect of the present invention, a hydraulic unloading system for a harvester is provided, comprising: a hydraulic pump connected to an oil tank of the harvester; an electromagnetic multi-way valve connected to the hydraulic pump and the oil tank; an offset cylinder connected to the electromagnetic multi-way valve via a first oil circuit; a first sequence valve connected to the first oil circuit; a first directional valve connected to the first sequence valve and the first directional valve connected to the electromagnetic multi-way valve; a lifting cylinder connected to the first directional valve and the lifting cylinder connected to the offset cylinder via a second oil circuit; a tilting cylinder connected to the first directional valve and the tilting cylinder connected to the offset cylinder via the second oil circuit; a second sequence valve disposed on the second oil circuit and the second oil circuit connected to the first directional valve; a limit sensor for detecting whether the lifting cylinder has returned to its position; and a controller electrically connected to the limit sensor for controlling whether the first directional valve is energized.

[0006] Preferably, the electromagnetic multi-way valve includes an oil inlet, an oil return port, a first oil port, and a second oil port. The oil inlet is connected to the hydraulic pump, the oil return port is connected to the oil tank, the first oil port is connected to the first directional valve, and the second oil port is connected to the first oil circuit.

[0007] Preferably, the electromagnetic multi-way valve further includes a second directional valve and an enabling valve, wherein the second directional valve is connected to the first oil inlet and the second oil inlet, and the enabling valve is connected to the second directional valve.

[0008] Preferably, the first directional valve is a two-position six-way directional valve, the second directional valve is a three-position four-way directional valve, and the enabling valve is a two-position two-way directional valve.

[0009] Preferably, the electromagnetic multi-way valve is equipped with an overflow valve, the first oil line is equipped with a one-way speed regulating valve, and a filter is provided between the hydraulic pump and the oil inlet.

[0010] Preferably, the first sequence valve is provided with a first preset pressure. When the ear box is unloading grain, after the offset cylinder moves to its position, the system pressure continues to rise to the first preset pressure, and the first sequence valve opens, allowing hydraulic oil to flow to the first directional valve. The second sequence valve is provided with a second preset pressure. When the ear box is returning to its original position, after the tilting cylinder falls back to its position, the system pressure continues to rise to the second preset pressure, and the second sequence valve opens, allowing hydraulic oil to flow to the offset cylinder.

[0011] Preferably, when the first directional valve is not energized, the first directional valve is connected to the tilting cylinder; when the first directional valve is energized, the first directional valve is connected to the lifting cylinder.

[0012] Preferably, when the ear-shaped box is adjusted in height, the controller energizes the first reversing valve to extend the lifting cylinder. After the lifting cylinder extends to the required length, the controller de-energizes the first reversing valve. When the ear-shaped box is in its return position, if the limit sensor detects that the lifting cylinder has not returned to its original position, the controller energizes the first reversing valve. When the limit sensor detects that the lifting cylinder has returned to its original position, the controller de-energizes the first reversing valve.

[0013] According to a second aspect of the present invention, a grain unloading structure for a grain-ear box is provided, wherein the grain unloading structure for the grain-ear box utilizes the grain unloading hydraulic system for a grain-ear box as described above. The grain unloading structure for the grain-ear box includes: a chassis, on which an offset cylinder is mounted; a bottom bracket, pivotally mounted on the chassis, wherein the offset cylinder is capable of driving the bottom bracket to pivot relative to the chassis, and a lifting cylinder is mounted on the bottom bracket; a chute bracket, mounted on the bottom bracket; a sliding bracket, telescopically mounted within the chute bracket, wherein the lifting cylinder is capable of driving the sliding bracket to extend or retract within the chute bracket; a cylinder seat bracket, mounted on the chute bracket, wherein a tilting cylinder is mounted on the cylinder seat bracket; and a grain-ear box, pivotally mounted on the top of the sliding bracket, wherein the tilting cylinder is capable of driving the grain-ear box to pivot relative to the sliding bracket.

[0014] Preferably, the limit sensor is located at the lower part of the sliding bracket and is used to detect whether the lifting cylinder has returned to its original position.

[0015] The unloading hydraulic system and unloading structure for the ear-shaped grain box in this invention, through the setting of a first sequence valve and a second sequence valve, combined with the coordinated operation of limit sensors and a controller, enables the offset cylinder, lifting cylinder, and tilting cylinder to operate sequentially in a predetermined order, thereby avoiding the need for three sets of three-position four-way directional valves to control three sets of cylinders separately. With this configuration, only one limit sensor is needed to detect whether the lifting cylinder has returned to its position, thus adjusting the unloading height of the ear-shaped grain box. This not only reduces the number of limit sensors but also correspondingly reduces the number of three-position four-way directional valves required, thereby lowering the overall cost. Furthermore, reducing the number of limit sensors helps reduce the risk of sensor failure, improving the safety of the system during use. This effectively solves the problem of how to safely and cost-effectively adjust the unloading height of the ear-shaped grain box of a harvester.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the unloading hydraulic system for the ear-of-grain box according to the present invention.

[0019] Figure 2 This is a schematic diagram of the unloading structure for the ear-of-grain box according to the present invention.

[0020] Figure 3 This is a schematic diagram of the unloading structure for the ear of grain box according to the present invention during unloading.

[0021] Figure 4 This is a schematic diagram of the support for the unloading structure of the ear of grain according to the present invention.

[0022] Reference numerals: 1-Lifting cylinder; 2-Tilting cylinder; 3-Offset cylinder; 4-Hydraulic pump; 5-Solenoid multi-way valve; 51-Second directional valve; 52-Enable valve; 53-Relief valve; 54-One-way speed control valve; 501-Oil inlet; 502-Oil return port; 503-First oil port; 504-Second oil port; 61-First sequence valve; 62-Second sequence valve; 7-First directional valve; 8-Limit sensor; 9-Controller; 10-Oil tank; 100-Filter; 11-First oil circuit; 12-Second oil circuit; 13-Chassis; 14-Bottom support; 15-Slide rail support; 16-Sliding support; 17-Cylinder seat support; 18-Harvest box. Detailed Implementation

[0023] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0024] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0025] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0026] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0027] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0028] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0029] The terminology used herein is for the purpose of describing various examples only and is not intended to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0030] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0031] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0032] like Figures 1 to 4 As shown, according to a first aspect of the present invention, a hydraulic unloading system for a grain-ear box is provided. The hydraulic unloading system for the grain-ear box includes a hydraulic pump 4, a solenoid multi-way valve 5, an offset cylinder 3, a first sequence valve 61, a first reversing valve 7, a lifting cylinder 1, a tilting cylinder 2, a second sequence valve 62, a limit sensor 8, and a controller 9.

[0033] In the following description, reference will be made to Figures 1 to 4 The specific structure of the aforementioned components of the unloading hydraulic system used for the ear of grain is described in detail, as well as the connection relationship of the aforementioned components.

[0034] like Figures 1 to 4As shown, in this embodiment, the hydraulic pump 4 (which may be a gear pump) is connected to the harvester's oil tank 10 via a pipeline. The electromagnetic multi-way valve 5 is connected to the hydraulic pump 4 via a pipeline, and the electromagnetic multi-way valve 5 is also connected to the oil tank 10 via a pipeline. The offset cylinder 3 is used to drive the ear-box support to pivot relative to the vehicle's chassis 13. The offset cylinder 3 is connected to the electromagnetic multi-way valve 5 via a first oil passage 11 to supply oil to the offset cylinder 3. The first sequence valve 61 is connected to the first oil passage 11 via a pipeline, and the first directional valve 7 is connected to the first sequence valve 61 via a pipeline, so that when the first sequence valve 61 is open, the first directional valve 7 is connected to the first oil passage 11. Additionally, the first directional valve 7 can be connected to the electromagnetic multi-way valve 5. The lifting cylinder 1 is connected to the first directional valve 7 via a pipeline and to the offset cylinder 3 via a second oil passage 12. The lifting cylinder 1 is used to adjust the height of the ear-box 18. The tilting cylinder 2 can also be connected to the first directional valve 7 via a pipeline, allowing the first directional valve 7 to control the flow of hydraulic oil to either the lifting cylinder 1 or the tilting cylinder 2. The tilting cylinder 2 is used to drive the ear box 18 to reverse, thereby unloading the grain. The tilting cylinder 2 can also be connected to the offset cylinder 3 via the second oil circuit 12, and a second sequence valve 62 is provided on the second oil circuit 12. The second oil circuit 12 can be connected to the first directional valve 7, so that when the second sequence valve 62 is open, the first directional valve 7 can be connected to the offset cylinder 3. The controller 9 and the limit sensor 8 can be electrically connected. The limit sensor 8 is used to detect whether the lifting cylinder 1 has fallen back into place, and the controller 9 can control whether the first directional valve 7 is energized based on the detection status of the limit sensor 8.

[0035] Preferred, such as Figure 1 As shown, in this embodiment, the electromagnetic multi-way valve 5 may include an inlet 501, a return port 502, a first oil inlet 503, and a second oil inlet 504. The inlet 501 can be connected to the hydraulic pump 4 via a pipeline. The return port 502 can be connected to the oil tank 10 via a pipeline. The first oil inlet 503 can be connected to the first directional valve 7 via a pipeline, and the second oil inlet 504 can be connected to the first oil passage 11. This configuration allows the oil tank 10 to supply oil to the electromagnetic multi-way valve 5, and the hydraulic oil flowing out of the electromagnetic multi-way valve 5 can flow to the offset cylinder 3 or the first directional valve 7.

[0036] Furthermore, preferably, such as Figure 1 As shown, in this embodiment, the first sequence valve 61 may be provided with a first preset pressure. When the ear box 18 is unloading grain, after the offset cylinder 3 moves to its position, when the system pressure continues to rise to the first preset pressure, the first sequence valve 61 opens, allowing hydraulic oil to flow to the first reversing valve 7, thereby supplying oil to the lifting cylinder 1 and the tilting cylinder 2.

[0037] Preferred, such as Figure 1 As shown, in this embodiment, the electromagnetic multi-way valve 5 may further include a second directional valve 51 and an enabling valve 52. The second directional valve 51 can be connected to the first oil port 503 and the second oil port 504, and the enabling valve 52 can be connected to the second directional valve 51 via a pipeline. More preferably, the first directional valve 7 can be a two-position six-way directional valve, the second directional valve 51 can be a three-position four-way directional valve, and the enabling valve 52 can be a two-position two-way directional valve.

[0038] In addition, preferred, such as Figure 1 As shown, in this embodiment, an overflow valve 53 may also be provided within the electromagnetic multi-way valve 5 for regulating flow rate. A one-way speed regulating valve 54 may be provided on the first oil circuit 11 for regulating the flow rate of hydraulic oil. A filter 100 may be provided between the hydraulic pump 4 and the oil inlet 501. The filter 100 may be a high-pressure filter for reducing impurities in the hydraulic oil.

[0039] Preferred, such as Figure 1 As shown, in this embodiment, the limit sensor 8 and the controller 9 can cooperate. The controller 9 can be electrically connected to the limit sensor 8, allowing the limit sensor 8 to transmit signals to the controller 9. The limit sensor 8 can detect whether the lifting cylinder 1 has returned to its position, and the controller 9 controls whether the first reversing valve 7 is energized based on the return status of the lifting cylinder 1. Preferably, when the first reversing valve 7 is not energized, the first reversing valve 7 is connected to the tilting cylinder 2. When the first reversing valve 7 is energized, the first reversing valve 7 is connected to the lifting cylinder 1. This configuration ensures that the first reversing valve 7 can only be connected to either the tilting cylinder 2 or the lifting cylinder 1 at the same time, allowing the lifting cylinder 1 and the tilting cylinder 2 to move sequentially and orderly.

[0040] Specifically, such as Figure 1 As shown, in this embodiment, when the ear-shaped box 18 needs height adjustment, the controller 9 can energize the first reversing valve 7 to extend the lifting cylinder 1. After the lifting cylinder 1 extends to the required length, the controller 9 controls (or the operator can manually control according to the height of the grain receiving vehicle) to de-energize the first reversing valve 7, stopping the lifting cylinder 1 from extending. When the ear-shaped box 18 is returning to its original position, if the limit sensor 8 detects that the lifting cylinder 1 has not returned to its original position, the controller 9 can energize the first reversing valve 7 to continue lowering the lifting cylinder 1. When the limit sensor 8 detects that the lifting cylinder 1 has returned to its original position, the controller 9 can de-energize the first reversing valve 7 to lower the tilting cylinder 2. Furthermore, the second sequence valve 62 can be provided with a second preset pressure. After the tilting cylinder 2 returns to its original position, the system pressure continues to rise to the second preset pressure, the second sequence valve 62 opens, allowing hydraulic oil to flow to the offset cylinder 3, thereby causing the offset cylinder 3 to fall.

[0041] During overall use, when the ear-shaped box 18 is not in operation, the power unit drives the hydraulic pump 4 to rotate. The hydraulic oil in the oil tank 10 enters the hydraulic pump 4, and the oil discharged from the hydraulic pump 4 enters the solenoid multi-way valve 5 through the filter 100. Under these conditions, the enable valve 52 is not energized, and the hydraulic oil enters the return port 502 of the solenoid multi-way valve 5 through the enable valve 52, and finally returns to the oil tank 10.

[0042] When the grain box 18 unloads grain directly without height adjustment, the power unit drives the hydraulic pump 4 to rotate. The hydraulic oil in the oil tank 10 enters the hydraulic pump 4, and the oil discharged from the hydraulic pump 4 enters the solenoid multi-way valve 5 through the filter 100. In this case, the enable valve 52 is energized, the first solenoid of the second directional valve 51 is energized, and the second directional valve 51 switches to the left position. The hydraulic oil enters the offset cylinder 3 through the one-way speed regulating valve 54. After the offset cylinder 3 moves to the maximum position (i.e., the position is reached), the system pressure continues to rise to the preset pressure of the first sequence valve 61. The first sequence valve 61 opens, and the hydraulic oil passes through the first sequence valve 61 to the first directional valve 7. In this case, the controller 9 controls the first directional valve 7 to be de-energized, that is, the first directional valve 7 is in the right position. The hydraulic oil enters the tilting cylinder 2 through the first directional valve 7, causing the tilting cylinder 2 to extend, thereby realizing the two-stage grain unloading action.

[0043] When the grain box 18 needs to be height adjusted before unloading, the power unit drives the hydraulic pump 4 to rotate. The hydraulic oil in the oil tank 10 enters the hydraulic pump 4, and the oil discharged from the hydraulic pump 4 enters the solenoid multi-way valve 5 through the filter 100. In this case, the enable valve 52 is energized, the first solenoid of the second directional valve 51 is energized, and the second directional valve 51 switches to the left position. The hydraulic oil enters the offset cylinder 3 through the one-way speed regulating valve 54. After the offset cylinder 3 moves to the maximum position (i.e., the position is reached), the system pressure continues to rise to the preset pressure of the first sequence valve 61. The first sequence valve 61 opens, and the hydraulic oil passes through the first sequence valve 61 to the first directional valve 7. In this case, the controller 9 controls the first directional valve 7 to be energized, that is, the first directional valve 7 is in the left position, and the hydraulic oil enters the lifting cylinder 1 through the first directional valve 7. When the lifting cylinder 1 extends to the required length, the operator controls the first directional valve 7 to stop being energized through the controller 9, and the lifting cylinder 1 stops extending. At this time, hydraulic oil enters the tilting cylinder 2 through the first directional valve 7, causing the tilting cylinder 2 to extend, thereby realizing the three-stage unloading action.

[0044] When the ear-shaped box 18 lowers, the power unit drives the hydraulic pump 4 to rotate. Hydraulic oil from the oil tank 10 enters the hydraulic pump 4, and the oil discharged from the hydraulic pump 4 passes through the filter 100 and enters the solenoid multi-way valve 5. In this situation, the enable valve 52 is energized, the second solenoid of the second directional valve 51 is energized, and the second directional valve 51 switches to the right position. At this time, the limit sensor 8 detects the lifting cylinder 1.

[0045] If the limit sensor 8 detects that the lifting cylinder 1 has returned to its position, the controller 9 de-energizes the first directional valve 7. At this time, the first directional valve 7 is in the right position, and the hydraulic oil enters the rod chamber of the tilting cylinder 2 through the solenoid multi-way valve 5 and the first directional valve 7. After the tilting cylinder 2 returns to its position, the system pressure continues to rise to the preset pressure of the second sequence valve 62. After the second sequence valve 62 opens, the hydraulic oil flows through the second sequence valve 62 to the rod chamber of the offset cylinder 3, causing the offset cylinder 3 to fall, thereby causing the ear box 18 to fall.

[0046] If the limit sensor 8 does not detect that the lifting cylinder 1 has not returned to its position, the controller 9 can energize the first directional valve 7. At this time, the first directional valve 7 is in the right position, and the hydraulic oil enters the rod chamber of the offset cylinder 3 through the solenoid multi-way valve 5 and the first directional valve 7. After the box offset cylinder 3 returns to its position, the limit sensor 8 detects that the lifting cylinder 1 has returned to its position, and the controller 9 de-energizes the first directional valve 7. At this time, the first directional valve 7 is in the right position, and the hydraulic oil enters the rod chamber of the tilting cylinder 2 through the solenoid multi-way valve 5 and the first directional valve 7. After the box tilting cylinder 2 returns to its position, the system pressure continues to rise to the preset pressure of the second sequence valve 62. After the second sequence valve 62 opens, the hydraulic oil flows through the second sequence valve 62 to the rod chamber of the offset cylinder 3, causing the offset cylinder 3 to fall, thereby realizing the fall of the ear box 18.

[0047] In addition, such as Figures 1 to 4 As shown, according to a second aspect of the present invention, a grain unloading structure for a grain-ear box is provided, wherein the grain unloading structure for the grain-ear box applies the grain unloading hydraulic system for the grain-ear box as described above.

[0048] Preferred, such as Figures 1 to 4As shown, in this embodiment, the unloading structure for the ear-shaped box may include a chassis 13, a bottom support 14, a chute support 15, a sliding support 16, a cylinder seat support 17, and an ear-shaped box 18. The ear-shaped box support can be a frame composed of the bottom support 14, the chute support 15, and the sliding support 16. The chassis 13 can be the chassis 13 of a harvester. The offset cylinder 3 can be fixedly mounted to the chassis 13 via a support. The bottom support 14 is pivotally mounted on the upper part of the chassis 13, and the end of the bottom support 14 can be connected to the chassis 13 via a pivot. The offset cylinder 3 can be located at the lower part of the bottom support 14, and the piston rod of the offset cylinder 3 can be connected to the bottom support 14, allowing the offset cylinder 3 to drive the bottom support 14 to pivot relative to the chassis 13, thereby offsetting the ear-shaped box support. The bottom end of the lifting cylinder 1 can be mounted to the top surface of the bottom support 14 via a fixing bracket. The chute support 15 can be vertically mounted to the end of the bottom support 14. The sliding bracket 16 is telescopically mounted within the chute bracket 15. The piston rod of the lifting cylinder 1 can be connected to the sliding bracket 16, allowing the lifting cylinder 1 to drive the sliding bracket 16 to extend or retract within the chute bracket 15, thereby adjusting the height of the ear-shaped box 18. The cylinder seat bracket 17 can be installed in the middle of the chute bracket 15. The bottom end of the tilting cylinder 2 can be installed on the cylinder seat bracket 17. The ear-shaped box 18 is pivotally mounted on the top of the sliding bracket 16, and the end of the ear-shaped box 18 can be connected to the top of the sliding bracket 16 via a pivot. The piston rod of the tilting cylinder 2 can be fixed to the side wall of the ear-shaped box 18, allowing the tilting cylinder 2 to drive the ear-shaped box 18 to pivot relative to the sliding bracket 16, thereby unloading the grain.

[0049] Furthermore, preferably, such as Figures 1 to 4 As shown, in this embodiment, there can be two lifting cylinders 1, two tilting cylinders 2, and two offset cylinders 3, symmetrically arranged on both sides of the ear-shaped box 18. Additionally, a limit sensor 8 can be installed at the lower part of the sliding brackets. Specifically, a crossbeam can be provided between the two sliding brackets 16, and the limit sensor 8 can detect whether the lifting cylinder 1 has returned to its original position by detecting the position of the crossbeam of the sliding bracket 16.

[0050] During use, the unloading hydraulic system and unloading structure for the ear-shaped container, through the setting of a first sequence valve 61 and a second sequence valve 62, combined with the cooperation structure of the limit sensor 8 and the controller 9, realizes the function of making the offset cylinder 3, lifting cylinder 1, and tilting cylinder 2 operate in a predetermined order, thereby avoiding the need to use three sets of three-position four-way directional valves to control three sets of cylinders separately. With this setting, only one limit sensor 8 is needed to detect whether the lifting cylinder 1 has fallen back to the correct position, which can adjust the unloading height of the ear-shaped container 18. This not only reduces the number of limit sensors required, but also correspondingly reduces the number of three-position four-way directional valves required, thereby reducing the overall cost. In addition, reducing the number of limit sensors helps to reduce the risk of sensor failure and improves the safety of the system during use.

[0051] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A hydraulic unloading system for a grain ear box, installed in a harvester, characterized in that, The unloading hydraulic system for the ear-of-grain box includes: A hydraulic pump is connected to the oil tank of the harvester; An electromagnetic multi-way valve is connected to the hydraulic pump, and the electromagnetic multi-way valve is connected to the oil tank; The offset cylinder is connected to the electromagnetic multi-way valve via the first oil circuit; The first sequence valve is connected to the first oil circuit; A first directional valve is connected to the first sequence valve, and the first directional valve is connected to the electromagnetic multi-way valve. A lifting cylinder is connected to the first directional valve, and the lifting cylinder is connected to the offset cylinder through a second oil circuit; A tilting cylinder is connected to the first directional valve, and the tilting cylinder is connected to the offset cylinder through the second oil circuit; A second sequence valve is disposed in the second oil circuit, and the second oil circuit is connected to the first directional valve; Limit sensors are used to detect whether the lifting cylinder has returned to its original position; and The controller is electrically connected to the limit sensor and is used to control whether the first reversing valve is energized.

2. The unloading hydraulic system for the ear-of-grain box according to claim 1, characterized in that, The electromagnetic multi-way valve includes an oil inlet, an oil return port, a first oil port, and a second oil port. The oil inlet is connected to the hydraulic pump, the oil return port is connected to the oil tank, the first oil port is connected to the first directional valve, and the second oil port is connected to the first oil circuit.

3. The unloading hydraulic system for the ear-of-grain box according to claim 2, characterized in that, The electromagnetic multi-way valve further includes a second directional valve and an enabling valve. The second directional valve is connected to the first oil inlet and the second oil inlet, and the enabling valve is connected to the second directional valve.

4. The unloading hydraulic system for the ear-of-grain box according to claim 3, characterized in that, The first directional valve is a two-position six-way directional valve, the second directional valve is a three-position four-way directional valve, and the enabling valve is a two-position two-way directional valve.

5. The unloading hydraulic system for the ear-of-grain box according to claim 3, characterized in that, The electromagnetic multi-way valve is equipped with an overflow valve, the first oil line is equipped with a one-way speed regulating valve, and a filter is installed between the hydraulic pump and the oil inlet.

6. The unloading hydraulic system for the ear-of-grain box according to claim 1, characterized in that, The first sequence valve is provided with a first preset pressure. When the ear box is unloading grain, after the offset cylinder moves to the position, the system pressure continues to rise to the first preset pressure, and the first sequence valve opens, so that the hydraulic oil flows to the first reversing valve. The second sequence valve is equipped with a second preset pressure. When the ear box returns to its original position, after the tilting cylinder falls back into place, the system pressure continues to rise to the second preset pressure, and the second sequence valve opens, allowing hydraulic oil to flow to the offset cylinder.

7. The unloading hydraulic system for the ear-of-grain box according to claim 1, characterized in that, When the first directional valve is not energized, it is connected to the tilting cylinder; when the first directional valve is energized, it is connected to the lifting cylinder.

8. The unloading hydraulic system for the ear-of-grain box according to claim 7, characterized in that, When the height of the ear box is adjusted, the controller controls the first reversing valve to be energized, causing the lifting cylinder to extend. After the lifting cylinder extends to the required length, the controller controls the first reversing valve to stop being energized. When the ear box is returning to its original position, if the limit sensor detects that the lifting cylinder has not returned to its original position, the controller controls the first reversing valve to be energized. When the limit sensor detects that the lifting cylinder has returned to its original position, the controller controls the first reversing valve to stop being energized.

9. A grain unloading structure for a grain ear box, characterized in that, The unloading structure for the ear-shaped grain box utilizes the unloading hydraulic system for the ear-shaped grain box as described in any one of claims 1 to 8, and the unloading structure for the ear-shaped grain box comprises: The chassis, on which the offset cylinder is mounted; A bottom bracket is pivotally mounted on the chassis, the offset cylinder is capable of driving the bottom bracket to pivot relative to the chassis, and the lifting cylinder is mounted on the bottom bracket; A slide rail bracket is installed on the bottom bracket; A sliding bracket is telescopically installed inside the slide rail bracket, and the lifting cylinder can drive the sliding bracket to extend or retract into the slide rail bracket; The cylinder seat bracket is mounted on the slide rail bracket, and the tilting cylinder is mounted on the cylinder seat bracket; and The ear of grain is pivotally mounted on the top of the sliding support, and the tilting cylinder can drive the ear of grain to pivot relative to the sliding support.

10. The unloading structure for the ear-of-grain box according to claim 9, characterized in that, The limit sensor is located at the lower part of the sliding bracket and is used to detect whether the lifting cylinder has fallen back into place.

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