Hydraulic unloading system for ear box and unloading structure for ear box

Abstract

The invention relates to the technical field of ear box unloading, in particular to an unloading hydraulic system for an ear box and an unloading structure for the ear box, and the unloading hydraulic system for the ear box comprises a hydraulic pump and an oil tank communicated with a harvester; the electromagnetic multi-way valve is communicated with the hydraulic pump and the oil tank; the offset oil cylinder is communicated with the electromagnetic multi-way valve through a first oil way; the first sequence valve is connected with the first oil path; the first reversing valve is connected to the first sequence valve and the electromagnetic multi-way valve; the lifting oil cylinder is connected to the first reversing valve and is connected to the offset oil cylinder through a second oil way; the overturning oil cylinder is connected to the first reversing valve and is connected to the offset oil cylinder through a second oil way; the second sequence valve is arranged on the second oil way and communicated with the first reversing valve; a limit sensor; and the controller is electrically connected with the limiting sensor. The unloading hydraulic system for the ear box and the unloading structure for the ear box can solve the problem of how to safely adjust the unloading height of the ear box of a harvester at low cost.

Description

Technical Field

[0001] The present application relates to the technical field of grain unloading from a fruit ear box, and in particular to a grain unloading hydraulic system and a grain unloading structure for a fruit ear box. Background Art

[0002] Corn harvesters that harvest both corn ears and stalks can harvest corn ears and stalks at the same time, which significantly improves the diversity and economic benefits of material harvesting. In recent years, they have been rapidly developed and widely used in my country. As a key component of corn harvesters that harvest both corn ears and stalks, the ear box is mainly used to load the harvested corn ears and transfer them to the grain collection vehicle. Specifically, the harvester transfers the corn ears to the ear box for storage through a belt or material roller. When the ear box is full, the hydraulic cylinder will push the ear box to flip over, thereby transferring the harvested corn to the grain collection vehicle.

[0003] However, the heights of grain collecting vehicles on the market vary, and existing harvesters are not equipped with the function of adjusting the height of the ear box. When the height of the grain collecting vehicle is high, the ear box cannot smoothly transfer the corn ears to the grain collecting vehicle, which greatly limits the working efficiency of the harvester. If three groups of three-position four-way reversing valves are used to control three groups of oil cylinders to achieve coordinated movement, and limit sensors are installed on each group of oil cylinders to monitor whether the movement of the ear box is in place, the complexity and cost of the system will increase, and multi-sensor control actions are prone to sensor failure, resulting in abnormal movements, which in turn causes safety problems. Summary of the invention

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

[0005] According to a first aspect of the present invention, a grain unloading hydraulic system for a fruit ear box is provided, wherein the grain unloading hydraulic system for the fruit ear box comprises: a hydraulic pump connected to the oil tank of the harvester; an electromagnetic multi-way valve connected to the hydraulic pump, and the electromagnetic multi-way valve is connected to the oil tank; an offset cylinder connected to the electromagnetic multi-way valve through a first oil circuit; a first sequence valve connected to the first oil circuit; a first reversing valve connected to the first sequence valve, and the first reversing valve is connected to the electromagnetic multi-way valve; a lifting cylinder connected to the first reversing valve, and the lifting cylinder is connected to the offset cylinder through a second oil circuit; a flip cylinder connected to the first reversing valve, and the flip cylinder is connected to the offset cylinder through the second oil circuit; a second sequence valve arranged on the second oil circuit, and the second oil circuit is connected to the first reversing valve; a limit sensor for detecting whether the lifting cylinder falls back into place; and a controller conductively connected to the limit sensor for controlling whether the first reversing 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 reversing valve, and the second oil port is connected to the first oil circuit.

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

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

[0009] Preferably, an overflow valve is provided in the electromagnetic multi-way valve, a one-way speed regulating valve is provided on the first oil circuit, 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 fruit ear box is unloading grain, after the offset cylinder moves into position, the system pressure continues to rise to reach the first preset pressure, and the first sequence valve opens, allowing the hydraulic oil to flow to the first reversing valve; the second sequence valve is provided with a second preset pressure. When the fruit ear box is returning, after the flip cylinder falls back into position, the system pressure continues to rise to reach the second preset pressure, and the second sequence valve opens, allowing the hydraulic oil to flow to the offset cylinder.

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

[0012] Preferably, when the height of the fruit ear box is adjusted, the controller controls the first reversing valve to be energized to extend the lifting cylinder. After the lifting cylinder is extended to the required length, the controller controls the first reversing valve to stop being energized. When the fruit ear box is returning, if the limit sensor detects that the lifting cylinder has not returned to its position, the controller controls the first reversing valve to be energized. When the limit sensor detects that the lifting cylinder has returned to its position, the controller controls the first reversing valve to stop being energized.

[0013] According to a second aspect of the present invention, a grain unloading structure for a fruit ear box is provided, wherein the grain unloading structure for the fruit ear box applies the grain unloading hydraulic system for the fruit ear box as described above, and the grain unloading structure for the fruit ear box comprises: a chassis, the offset cylinder is installed on the chassis; a bottom bracket is pivotally installed on the chassis, the offset cylinder can drive the bottom bracket to pivot relative to the chassis, and the lifting cylinder is installed on the bottom bracket; a slide bracket is installed on the bottom bracket; a sliding bracket is telescopically installed in the slide bracket, and the lifting cylinder can drive the sliding bracket to extend or retract into the slide bracket; a cylinder seat bracket is installed on the slide bracket, and the flip cylinder is installed on the cylinder seat bracket; and a fruit ear box is pivotally installed on the top end of the sliding bracket, and the flip cylinder can drive the fruit ear box to pivot relative to the sliding bracket.

[0014] Preferably, the limit sensor is arranged at the lower part of the sliding bracket to detect whether the lifting cylinder falls back into place.

[0015] The grain unloading hydraulic system for the ear box and the grain unloading structure for the ear box of the embodiment of the present invention realize the function of making the offset cylinder, the lifting cylinder and the flip cylinder act in sequence according to a predetermined order by setting a first sequence valve and a second sequence valve, and combining the coordinated work of the limit sensor and the controller, thereby avoiding the situation of using three groups of three-position four-way reversing valves to control the three groups of cylinders respectively. With such a setting, only one limit sensor is needed to detect whether the lifting cylinder falls back into place, so as to adjust the grain unloading height of the ear box of the machine. This not only reduces the number of limit sensors, but also reduces the number of three-position four-way reversing 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. In this way, the problem of how to safely and cost-effectively adjust the grain unloading height of the harvester ear box can be effectively solved.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

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

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

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

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

[0022] Figure markings: 1-lifting cylinder; 2-turning cylinder; 3-offset cylinder; 4-hydraulic pump; 5-electromagnetic multi-way valve; 51-second reversing valve; 52-enabling valve; 53-overflow valve; 54-one-way speed regulating 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 reversing valve; 8-limit sensor; 9-controller; 10-oil tank; 100-filter; 11-first oil circuit; 12-second oil circuit; 13-chassis; 14-bottom bracket; 15-slide bracket; 16-sliding bracket; 17-cylinder seat bracket; 18-fruit bunch box. DETAILED DESCRIPTION

[0023] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve 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 interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

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

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

[0027] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0028] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the 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 relational terms used herein will be interpreted accordingly.

[0029] The terms used herein are only used to describe various examples and are not used to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprising" and "having" list the existence of the stated features, quantities, operations, components, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0030] Variations in the shapes shown in the 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 drawings but include variations in shapes that occur during manufacturing.

[0031] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0032] like Figures 1 to 4 As shown, according to the first aspect of the present invention, a grain unloading hydraulic system for a fruit ear box is provided, and the grain unloading hydraulic system for the fruit ear box includes a hydraulic pump 4, an electromagnetic multi-way valve 5, an offset cylinder 3, a first sequence valve 61, a first reversing valve 7, a lifting cylinder 1, a flip 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 above components of the grain unloading hydraulic system for the ear box and the connection relationship of the above components are specifically described.

[0034] like Figures 1 to 4As shown, in the embodiment, the hydraulic pump 4 (which can be a gear pump) can be connected to the oil tank 10 of the harvester through a pipeline. The electromagnetic multi-way valve 5 can be connected to the hydraulic pump 4 through a pipeline, and the electromagnetic multi-way valve 5 can be connected to the oil tank 10 through a pipeline. The offset cylinder 3 is used to drive the ear box bracket to pivot relative to the chassis 13 of the vehicle. The offset cylinder 3 can be connected to the electromagnetic multi-way valve 5 through the first oil circuit 11 to realize oil supply to the offset cylinder 3. The first sequence valve 61 can be connected to the first oil circuit 11 through a pipeline, and the first reversing valve 7 can be connected to the first sequence valve 61 through a pipeline, so that when the first sequence valve 61 is opened, the first reversing valve 7 can be connected to the first oil circuit 11. In addition, the first reversing valve 7 can be connected to the electromagnetic multi-way valve 5. The lifting cylinder 1 can be connected to the first reversing valve 7 through a pipeline, and is connected to the offset cylinder 3 through the second oil circuit 12. The lifting cylinder 1 is used to adjust the height of the ear box 18. The flip cylinder 2 can also be connected to the first reversing valve 7 through a pipeline, so that the first reversing valve 7 can control the flow of hydraulic oil to the lifting cylinder 1 or the flip cylinder 2. The flip cylinder 2 is used to drive the ear box 18 to reverse to achieve grain unloading. The flip cylinder 2 can also be connected to the offset cylinder 3 through 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 reversing valve 7, so that when the second sequence valve 62 is opened, the first reversing valve 7 can be connected to the offset cylinder 3. The controller 9 and the limit sensor 8 can be conductively connected. Among them, the limit sensor 8 is used to detect whether the lifting cylinder 1 falls back into place, and the controller 9 can control whether the first reversing valve 7 is energized according to the detection of the limit sensor 8.

[0035] Preferably, Figure 1 As shown, in the embodiment, the electromagnetic multi-way valve 5 may include an oil inlet 501, an oil return port 502, a first oil port 503 and a second oil port 504. The oil inlet 501 may be connected to the hydraulic pump 4 through a pipeline. The oil return port 502 may be connected to the oil tank 10 through a pipeline. The first oil port 503 may be connected to the first reversing valve 7 through a pipeline, and the second oil port 504 may be connected to the first oil circuit 11. In this way, the oil tank 10 can 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 reversing valve 7.

[0036] Further, preferably, Figure 1 As shown, in the embodiment, the first sequence valve 61 can be provided with a first preset pressure. When the ear box 18 is unloading grain, after the offset cylinder 3 moves into place, when the system pressure continues to rise and reaches the first preset pressure, the first sequence valve 61 is opened, so that the hydraulic oil can flow to the first reversing valve 7, and then the lifting cylinder 1 and the tilting cylinder 2 can be supplied with oil.

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

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

[0039] Preferably, Figure 1 As shown, in the embodiment, the limit sensor 8 and the controller 9 can cooperate. The controller 9 can be conductively connected to the limit sensor 8, so that the limit sensor 8 can transmit a signal to the controller 9. The limit sensor 8 can detect whether the lifting cylinder 1 falls back into place, and the controller 9 controls whether the first reversing valve 7 is energized according to the fall of the lifting cylinder 1. Preferably, when the first reversing valve 7 is not energized, the first reversing valve 7 is connected to the flipping cylinder 2. When the first reversing valve 7 is energized, the first reversing valve 7 is connected to the lifting cylinder 1. In this way, the first reversing valve 7 can only be connected to one of the flipping cylinder 2 or the lifting cylinder 1 at the same time, so that the lifting cylinder 1 and the flipping cylinder 2 can move in sequence in an orderly manner.

[0040] Specifically, Figure 1 As shown, in the embodiment, when the height of the ear box 18 needs to be adjusted, the controller 9 can control the first reversing valve 7 to be energized to extend the lifting cylinder 1. After the lifting cylinder 1 is extended to the required length, the controller 9 controls (it can be manually controlled by the operator according to the height of the grain collecting vehicle) the first reversing valve 7 to stop being energized, so that the lifting cylinder 1 stops extending. When the ear box 18 is returning to its original position, if the limit sensor 8 detects that the lifting cylinder 1 has not fallen back to its original position, the controller 9 can control the first reversing valve 7 to be energized to continue to fall back. When the limit sensor 8 detects that the lifting cylinder 1 has fallen back to its original position, the controller 9 can control the first reversing valve 7 to stop being energized to make the flip cylinder 2 fall back. Further, the second sequence valve 62 can be provided with a second preset pressure. After the flip cylinder 2 falls back to its original position, the system pressure continues to rise to reach the second preset pressure, and the second sequence valve 62 is opened, so that the hydraulic oil flows to the offset cylinder 3, thereby making the offset cylinder 3 fall back.

[0041] During the overall use process, when the ear box 18 is not in motion, the power device drives the hydraulic pump 4 to rotate, the hydraulic oil in the oil tank 10 enters the hydraulic pump 4, and the oil discharged by the hydraulic pump 4 enters the electromagnetic multi-way valve 5 through the filter 100. In this case, the enabling valve 52 is not energized, and the hydraulic oil enters the oil return port 502 of the electromagnetic multi-way valve 5 through the enabling valve 52, and finally returns to the oil tank 10.

[0042] When the ear box 18 is unloaded directly without height adjustment, the power device 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 electromagnetic multi-way valve 5 through the filter 100. In this case, the enabling valve 52 is energized, the first electromagnet of the second reversing valve 51 is energized, and the second reversing valve 51 is switched 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., moves to the position), the system pressure continues to rise to reach the preset pressure of the first sequence valve 61, the first sequence valve 61 is opened, and the hydraulic oil passes through the first sequence valve 61 to reach the first reversing valve 7. In this case, the controller 9 controls the first reversing valve 7 to be de-energized, that is, the first reversing valve 7 is in the right position, and the hydraulic oil enters the flip cylinder 2 through the first reversing valve 7, so that the flip cylinder 2 extends, thereby realizing the secondary unloading action.

[0043] When the ear box 18 needs to be unloaded after height adjustment, the power device drives the hydraulic pump 4 to rotate, the hydraulic oil in the oil tank 10 enters the hydraulic pump 4, and the oil discharged by the hydraulic pump 4 enters the electromagnetic multi-way valve 5 through the filter 100. In this case, the enabling valve 52 is energized, the first electromagnet of the second reversing valve 51 is energized, and the second reversing valve 51 is switched 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., moves to the position), the system pressure continues to rise to reach the preset pressure of the first sequence valve 61, the first sequence valve 61 is opened, and the hydraulic oil passes through the first sequence valve 61 to reach the first reversing valve 7. In this case, the controller 9 controls the first reversing valve 7 to be energized, that is, the first reversing valve 7 is in the left position, and the hydraulic oil enters the lifting cylinder 1 through the first reversing valve 7. When the lifting cylinder 1 extends to the required length, the operator controls the first reversing valve 7 to stop being energized through the controller 9, and the lifting cylinder 1 stops extending further. At this time, the hydraulic oil enters the turning cylinder 2 through the first reversing valve 7, causing the turning cylinder 2 to extend, thereby realizing the three-stage grain unloading action.

[0044] When the ear box 18 performs the falling action, the power device drives the hydraulic pump 4 to rotate, the hydraulic oil in the oil tank 10 enters the hydraulic pump 4, and the oil discharged by the hydraulic pump 4 enters the electromagnetic multi-way valve 5 through the filter 100. In this case, the enabling valve 52 is energized, the second electromagnet of the second reversing valve 51 is energized, and the second reversing valve 51 is switched 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 fallen back into place, the controller 9 controls the first reversing valve 7 to be de-energized. At this time, the first reversing valve 7 is in the right position, and the hydraulic oil enters the rod chamber of the flip cylinder 2 through the electromagnetic multi-way valve 5 and the first reversing valve 7. After the box flip cylinder 2 falls back into place, the system pressure continues to rise to reach the preset pressure of the second sequence valve 62. After the second sequence valve 62 is opened, 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 back, thereby achieving the fall of the ear box 18.

[0046] If the limit sensor 8 does not detect that the lifting cylinder 1 has not fallen back into place, the controller 9 can control the first reversing valve 7 to be energized. At this time, the first reversing valve 7 is in the right position, and the hydraulic oil passes through the electromagnetic multi-way valve 5 and the first reversing valve 7 to enter the rod chamber of the offset cylinder 3. After the box offset cylinder 3 falls back into place, the limit sensor 8 detects that the lifting cylinder 1 has fallen back into place, and the controller 9 controls the first reversing valve 7 to stop being energized. At this time, the first reversing valve 7 is in the right position, and the hydraulic oil passes through the electromagnetic multi-way valve 5 and the first reversing valve 7 to enter the rod chamber of the flip cylinder 2. After the box flip cylinder 2 falls back into place, the system pressure continues to rise to reach the preset pressure of the second sequence valve 62. After the second sequence valve 62 is opened, the hydraulic oil flows to the rod chamber of the offset cylinder 3 through the second sequence valve 62, causing the offset cylinder 3 to fall back, thereby achieving the fall of the ear box 18.

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

[0048] Preferably, Figures 1 to 4As shown, in an embodiment, the grain unloading structure for the ear box may include a chassis 13, a bottom bracket 14, a chute bracket 15, a sliding bracket 16, a cylinder seat bracket 17 and an ear box 18. Among them, the ear box bracket can be a frame composed of a bottom bracket 14, a chute bracket 15 and a sliding bracket 16. The chassis 13 can be a complete chassis 13 of a harvester. The offset cylinder 3 can be fixedly mounted on the chassis 13 through a bracket. The bottom bracket 14 can be pivotally mounted on the upper part of the chassis 13, and the end of the bottom bracket 14 can be connected to the chassis 13 through a rotating shaft. The offset cylinder 3 can be arranged at the lower part of the bottom bracket 14, and the piston rod of the offset cylinder 3 can be connected to the bottom bracket 14, so that the offset cylinder 3 can drive the bottom bracket 14 to pivot relative to the chassis 13 to drive the ear box bracket to deflect. The bottom end of the lifting cylinder 1 can be mounted on the top surface of the bottom bracket 14 through a fixed frame. The chute bracket 15 can be vertically mounted on the end of the bottom bracket 14. The sliding bracket 16 can be telescopically installed in the chute bracket 15. The piston rod of the lifting cylinder 1 can be connected to the sliding bracket 16, so that the lifting cylinder 1 can drive the sliding bracket 16 to extend or retract in the chute bracket 15 to adjust the height of the ear box 18. The cylinder seat bracket 17 can be installed in the middle of the chute bracket 15. The bottom end of the flip cylinder 2 can be installed on the cylinder seat bracket 17. The ear box 18 can be pivotally installed on the top of the sliding bracket 16, and the end of the ear box 18 can be connected to the top of the sliding bracket 16 through a rotating shaft. The piston rod of the flip cylinder 2 can be fixed to the side wall of the ear box 18, so that the flip cylinder 2 can drive the ear box 18 to pivot relative to the sliding bracket 16 to achieve grain unloading.

[0049] Further, preferably, Figures 1 to 4 As shown, in the embodiment, the number of the lifting cylinder 1, the flipping cylinder 2 and the offset cylinder 3 can all be two, which are symmetrically arranged on both sides of the ear box 18. In addition, the limit sensor 8 can be arranged at the lower part of the sliding bracket. Specifically, a crossbeam can be arranged between the two sliding brackets 16, and the limit sensor 8 can detect whether the lifting cylinder 1 falls back into place by detecting the position of the crossbeam of the sliding bracket 16.

[0050] During use, the grain unloading hydraulic system and grain unloading structure for the ear box, by setting the first sequence valve 61 and the second sequence valve 62, and combining the matching structure of the limit sensor 8 and the controller 9, realizes the function of making the offset cylinder 3, the lifting cylinder 1 and the flip cylinder 2 act in sequence according to a predetermined order, thereby avoiding the situation of using three groups of three-position four-way reversing valves to control the three groups of cylinders respectively. With such a setting, only one limit sensor 8 is needed to detect whether the lifting cylinder 1 falls back into place, so as to realize the grain unloading height of the ear box 18 of the regulating machine. This not only reduces the number of limit sensors required, but also correspondingly reduces the number of three-position four-way reversing valves required, thereby reducing the overall cost. In addition, reducing the number of limit sensors used helps to reduce the risk of sensor failure and improve the safety of the system during use.

[0051] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A grain unloading hydraulic system for a fruit ear box, arranged on a harvester, characterized in that: The grain unloading hydraulic system for the ear box comprises: A hydraulic pump connected to the oil tank of the harvester; An electromagnetic multi-way valve connected to the hydraulic pump, and the electromagnetic multi-way valve is connected to the oil tank; An offset oil cylinder is connected to the electromagnetic multi-way valve through a first oil path; A first sequence valve connected to the first oil circuit; A first reversing valve connected to the first sequence valve, wherein the first reversing valve is connected to the electromagnetic multi-way valve; A lifting cylinder connected to the first reversing valve, wherein the lifting cylinder is connected to the offset cylinder via a second oil circuit; A tilting oil cylinder connected to the first reversing valve, wherein the tilting oil cylinder is connected to the offset oil cylinder through the second oil circuit; a second sequence valve, arranged in the second oil circuit, wherein the second oil circuit is connected to the first reversing valve; A limit sensor, used to detect whether the lifting cylinder has fallen back into place; and A controller is conductively connected to the limit sensor and is used to control whether the first reversing valve is energized.

2. The grain unloading hydraulic system for a fruit ear 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 reversing valve, and the second oil port is connected to the first oil circuit.

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

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

5. The grain unloading hydraulic system for a fruit ear box according to claim 3, characterized in that: An overflow valve is arranged in the electromagnetic multi-way valve, a one-way speed regulating valve is arranged in the first oil circuit, and a filter is arranged between the hydraulic pump and the oil inlet.

6. The grain unloading hydraulic system for a fruit ear 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 oil cylinder moves into position, the system pressure continues to rise to reach the first preset pressure, and the first sequence valve is opened, so that the hydraulic oil flows to the first reversing valve; The second sequence valve is provided with a second preset pressure. When the ear box performs a return action, after the flip cylinder falls back into place, the system pressure continues to rise to reach the second preset pressure, and the second sequence valve opens, allowing the hydraulic oil to flow to the offset cylinder.

7. The grain unloading hydraulic system for a fruit ear box according to claim 1, characterized in that: When the first reversing valve is not energized, the first reversing valve is connected to the tilting cylinder. When the first reversing valve is energized, the first reversing valve is connected to the lifting cylinder.

8. The grain unloading hydraulic system for a fruit ear 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 to extend the lifting cylinder. After the lifting cylinder is extended to a required length, the controller controls the first reversing valve to stop being energized. When the fruit ear box performs a return action, if the limit sensor detects that the lifting cylinder has not returned to its position, the controller controls the first reversing valve to be energized. When the limit sensor detects that the lifting cylinder has returned to its position, the controller controls the first reversing valve to stop being energized.

9. A grain unloading structure for a fruit ear box, characterized in that: The grain unloading structure for the ear box is applied with the grain unloading hydraulic system for the ear box according to any one of claims 1 to 8, and the grain unloading structure for the ear box comprises: a chassis, the offset cylinder being mounted on the chassis; a bottom bracket pivotally mounted on the chassis, the offset cylinder being capable of driving the bottom bracket to pivot relative to the chassis, the lifting cylinder being mounted on the bottom bracket; A slide bracket, mounted on the bottom bracket; A sliding bracket is telescopically mounted in the slide bracket, and the lifting cylinder can drive the sliding bracket to extend or retract into the slide bracket; A cylinder seat bracket, mounted on the slide bracket, and the tilting cylinder is mounted on the cylinder seat bracket; and The ear box is pivotally mounted on the top end of the sliding bracket, and the turning oil cylinder can drive the ear box to pivot relative to the sliding bracket.

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

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