Hydraulic control system for chassis balance and grain harvester

Abstract

The hydraulic control system is used for being installed on a chassis, the chassis comprises a front vehicle body, a middle vehicle body connected with the front vehicle body, a rear vehicle body rotatably connected with the middle vehicle body, and a balance oil cylinder connected with the middle vehicle body and the rear vehicle body. The balance oil cylinder comprises a rodless cavity and a rod cavity, and the hydraulic control system comprises an oil tank, a first oil way communicating with the rodless cavity and the oil tank, a second oil way communicating with the rod cavity and the oil tank, and an oil way opening and closing assembly used for opening or closing the first oil way and the second oil way at the same time. The pressure relief assemblies are arranged on the first oil way and the second oil way respectively and used for enabling hydraulic oil in the first oil way or the second oil way to flow back into the oil tank when oil pressure in the first oil way or the second oil way is higher than preset pressure. The device is high in practicability and suitable for wide popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery, in particular to a hydraulic control system for chassis balancing. In addition, the utility model also relates to a grain harvester including the hydraulic control system for chassis balancing. Background Art

[0002] At present, the chassis of grain harvesters such as fresh corn harvesters is mainly composed of a front body, a middle body, a rear body, a balancing cylinder and a hydraulic system. The balancing cylinder is connected to the middle body and the rear body respectively, and the hydraulic system controls the operation of the balancing cylinder. When the grain harvester harvests grain or transports it to another site, the balancing cylinder can pump hydraulic oil to make the piston rod extend and retract, so that the rear body can swing within a certain swing range relative to the middle body to reduce shock, thereby improving the stability of the grain harvester during travel and avoiding grain leakage and waste; when the grain harvester tilts the grain box to unload, the two ends of the balancing cylinder are locked and the piston rod is fixed, thereby making the chassis fixed under the overload condition, thereby avoiding the risk of rollover.

[0003] However, when the grain harvester is unloading grain, the rear body is susceptible to a large eccentric load, and the balancing cylinder is also subjected to a large eccentric load, resulting in excessive working pressure of the hydraulic system, making the hydraulic system prone to bursting pipes and causing the entire machine to roll over.

[0004] It should be noted that the disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of this application, and it does not necessarily belong to the prior art of this application. In the absence of clear evidence that the above content has been disclosed on the filing date of this application, the above background technology should not be used to evaluate the novelty and creativity of this application. Utility Model Content

[0005] The utility model provides a hydraulic control system for chassis balancing and a grain harvester, which solves the technical problem that the hydraulic system on the chassis of the existing grain harvester is prone to pipe bursting during grain unloading, thereby causing the entire machine to roll over.

[0006] According to one aspect of the utility model, a hydraulic control system for chassis balancing is provided, which is used to be installed on a chassis, wherein the chassis includes a front body, an intermediate body connected to the front body, a rear body rotatably connected to the intermediate body, and a balancing oil cylinder connected to the intermediate body and the rear body, respectively, the balancing oil cylinder including a rodless chamber and a rod chamber, the hydraulic control system including an oil tank, a first oil circuit connected to the rodless chamber and the oil tank, respectively, a second oil circuit connected to the rod chamber and the oil tank, an oil circuit opening and closing assembly for simultaneously opening or closing the first oil circuit and the second oil circuit, and a pressure relief assembly respectively arranged on the first oil circuit and the second oil circuit for allowing the hydraulic oil in the first oil circuit or the second oil circuit to flow back to the oil tank when the oil pressure in the first oil circuit or the second oil circuit is higher than a preset pressure.

[0007] As a further improvement of the above technical solution:

[0008] Furthermore, the first oil circuit includes an oil pipe 1 connected to the rodless chamber and the oil tank respectively, the second oil circuit includes an oil pipe 2 connected to the rod chamber and the oil tank respectively, and the oil circuit opening and closing assembly includes an electromagnetic reversing valve 1 connected to the oil pipe 1 and the oil pipe 2 respectively for opening or closing the oil pipe 1 and the oil pipe 2 at the same time.

[0009] Furthermore, the first oil circuit also includes a return oil pipe 1 connected to the oil delivery pipe 1 and the oil tank respectively, and the pressure relief assembly includes an overflow valve 1 arranged on the return oil pipe 1 for opening the return oil pipe 1 when the oil pressure in the oil delivery pipe 1 is higher than a preset pressure.

[0010] Furthermore, the second oil circuit also includes a return oil pipe 2 connected to the oil pipeline 2 and the oil tank respectively, and the pressure relief assembly includes a relief valve 2 arranged on the return oil pipe 2 for opening the return oil pipe 2 when the oil pressure in the oil pipeline 2 is higher than a preset pressure.

[0011] Furthermore, the hydraulic control system also includes a first oil replenishing component connected to the oil pipe 1 and the oil tank respectively for replenishing hydraulic oil into the rodless cavity, and a second oil replenishing component connected to the oil pipe 2 and the oil tank respectively for replenishing hydraulic oil into the rod cavity.

[0012] Furthermore, the first oil-replenishing component includes an oil-replenishing pipe 1 connected to the oil delivery pipe 1 and the oil tank respectively, and a one-way valve 1 arranged on the oil-replenishing pipe 1 for allowing the hydraulic oil to flow in one direction into the rodless chamber; and / or the second oil-replenishing component includes an oil-replenishing pipe 2 connected to the oil delivery pipe 2 and the oil tank respectively, and a one-way valve 2 arranged on the oil-replenishing pipe 2 for allowing the hydraulic oil to flow in one direction into the rod chamber.

[0013] Furthermore, the first oil circuit includes an oil outlet pipe 1 connected to the rodless chamber and the oil tank respectively, and an oil return pipe 3 connected to the oil outlet pipe 1 and the oil tank respectively; the second oil circuit includes an oil outlet pipe 2 connected to the rod chamber and the oil tank respectively, and an oil return pipe 4 connected to the oil outlet pipe 2 and the oil tank respectively.

[0014] Furthermore, the pressure relief assembly includes a pilot overflow valve 1 arranged on the return oil pipe 3 for opening the return oil pipe 3 when the oil pressure in the oil outlet pipe 1 is higher than a preset pressure, and a pilot overflow valve 2 arranged on the return oil pipe 4 for opening the return oil pipe 4 when the oil pressure in the oil outlet pipe 2 is higher than a preset pressure.

[0015] Furthermore, the oil circuit opening and closing assembly includes a one-way valve three arranged on the oil outlet pipe one for allowing the hydraulic oil to flow unidirectionally into the rodless chamber, a one-way valve four arranged on the oil outlet pipe two for allowing the hydraulic oil to flow unidirectionally into the rod chamber, a control pipe one respectively connected to the pilot overflow valve one and the return oil pipe three, an electromagnetic reversing valve two arranged on the control pipe one for applying a preset pressure to the pilot overflow valve one to open the pilot overflow valve one in a power-off state, a control pipe two respectively connected to the pilot overflow valve two and the return oil pipe four, and an electromagnetic reversing valve three arranged on the control pipe two for applying a preset pressure to the pilot overflow valve two to open the pilot overflow valve two in a power-off state.

[0016] According to another aspect of the present invention, a grain harvester is provided, which includes the above-mentioned hydraulic control system for chassis balancing.

[0017] The utility model has the following beneficial effects:

[0018] The hydraulic control system for chassis balancing of the utility model is installed on the chassis to control the operation of the balancing oil cylinder. The chassis includes a front vehicle body, an intermediate vehicle body connected to the front vehicle body, a rear vehicle body rotatably connected to the intermediate vehicle body, and a balancing oil cylinder respectively connected to the intermediate vehicle body and the rear vehicle body. When harvesting and transferring grain, due to complex road conditions and rugged ground surfaces, the oil circuit opening and closing assembly simultaneously opens the first oil circuit and the second oil circuit. The rodless chamber of the balancing oil cylinder can draw hydraulic oil from the oil tank or return hydraulic oil to the oil tank through the first oil circuit, and the rod chamber of the balancing oil cylinder can draw hydraulic oil from the oil tank or return hydraulic oil to the oil tank through the second oil circuit, thereby making the piston of the balancing oil cylinder extend and retract. During travel, the rear vehicle body can be level relative to the intermediate vehicle body. The balancing oil cylinder swings and absorbs shock within the telescopic stroke, thereby improving stability during the stroke and avoiding grain leakage and waste. When the grain box is tipped over to unload, the oil circuit opening and closing component simultaneously closes the first oil circuit and the second oil circuit to lock the balancing oil cylinder to prevent the rear body from swinging relative to the middle body, so that the chassis is fixed under the overload condition, thereby avoiding the risk of rollover. When the oil pressure in the first oil circuit or the second oil circuit is higher than the preset pressure, the hydraulic oil in the first oil circuit or the second oil circuit is returned to the oil tank through the pressure relief component to prevent the pipes in the first oil circuit or the second oil circuit from bursting, thereby avoiding the rollover of the entire machine. Compared with the existing technology, this solution can prevent pipe bursts during the unloading process and avoid accidents of the entire machine rolling over. It is highly practical and suitable for wide promotion and application.

[0019] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is a hydraulic principle diagram of a chassis balancing hydraulic control system according to a preferred embodiment of the present invention;

[0022] Figure 2 This is a hydraulic principle diagram of a chassis balancing hydraulic control system according to a second preferred embodiment of the present invention;

[0023] Figure 3 This is a structural diagram of a grain harvesting vehicle according to a preferred embodiment of the present invention;

[0024] Figure 4 yes Figure 3 Schematic diagram of the structure of the chassis of the grain harvesting vehicle shown.

[0025] Legend:

[0026] 100, oil tank; 200, first oil circuit; 300, second oil circuit; 410, solenoid reversing valve one; 420, one-way valve three; 430, one-way valve four; 440, solenoid reversing valve two; 450, solenoid reversing valve three; 510, overflow valve one; 520, overflow valve two; 530, pilot-operated overflow valve one; 540, pilot-operated overflow valve two; 610, one-way valve one; 620, one-way valve two. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0028] like Figure 1 and Figure 4As shown, the chassis balancing hydraulic control system of this embodiment is intended to be installed on a chassis. The chassis includes a front body, an intermediate body connected to the front body, a rear body rotatably connected to the intermediate body, and balancing cylinders connected to the intermediate and rear bodies, respectively. The balancing cylinders include a rodless chamber and a rod chamber. The hydraulic control system includes a fuel tank 100, a first oil circuit 200 communicating with the rodless chamber and the fuel tank 100, respectively, a second oil circuit 300 communicating with the rod chamber and the fuel tank 100, an oil circuit opening and closing assembly for simultaneously opening or closing the first and second oil circuits 200 and 300, and a pressure relief assembly disposed on the first and second oil circuits 200 and 300, respectively, for returning the hydraulic oil in the first or second oil circuits 200 and 300 to the fuel tank 100 when the oil pressure in the first or second oil circuits exceeds a preset pressure. Optionally, the fuel tank 100 is disposed on the rear body to enhance the rear body's rollover resistance.

[0029] like Figure 1 、 Figure 3 and Figure 4 As shown, specifically, the hydraulic control system for chassis balancing of the utility model is installed on the chassis to control the operation of the balancing oil cylinder. The chassis includes a front body, an intermediate body connected to the front body, a rear body rotatably connected to the intermediate body, and a balancing oil cylinder connected to the intermediate body and the rear body respectively. When harvesting and transferring grain, due to complex road conditions and rugged ground, the oil circuit opening and closing component opens the first oil circuit 200 and the second oil circuit 300 at the same time. The rodless chamber of the balancing oil cylinder can draw hydraulic oil from the oil tank 100 or return hydraulic oil to the oil tank 100 through the first oil circuit 200, and the rod chamber of the balancing oil cylinder can draw hydraulic oil from the oil tank 100 or return hydraulic oil to the oil tank 100 through the second oil circuit 300, thereby making the piston of the balancing oil cylinder extend and retract. During the travel, the rear body can move relative to the intermediate body. The balancing oil cylinder swings and absorbs shock within the telescopic stroke, thereby improving stability during the stroke and avoiding grain leakage and waste. When the grain box is tipped over to unload, the oil circuit opening and closing component simultaneously closes the first oil circuit 200 and the second oil circuit 300 to lock the balancing oil cylinder to prevent the rear body from swinging relative to the middle body, so that the chassis is fixed under the overload condition, thereby avoiding the risk of rollover. When the oil pressure in the first oil circuit 200 or the second oil circuit 300 is higher than the preset pressure, the hydraulic oil in the first oil circuit 200 or the second oil circuit 300 is returned to the oil tank 100 through the pressure relief component to prevent the pipes in the first oil circuit 200 or the second oil circuit 300 from bursting, thereby avoiding the rollover of the entire machine. Compared with the existing technology, this solution can prevent pipe bursts during unloading and avoid accidents of rollover of the entire machine. It is highly practical and suitable for wide promotion and application.

[0030] like Figure 1As shown, in this embodiment, the first oil circuit 200 includes an oil pipe 1 connected to the rodless chamber and the oil tank 100 respectively, the second oil circuit 300 includes an oil pipe 2 connected to the rod chamber and the oil tank 100 respectively, and the oil circuit opening and closing assembly includes an electromagnetic reversing valve 410 connected to the oil pipe 1 and the oil pipe 2 respectively for opening or closing the oil pipe 1 and the oil pipe 2 at the same time. Specifically, in the de-energized state, electromagnetic reversing valve 1 410 simultaneously opens oil pipe 1 and oil pipe 2. The rodless chamber can draw hydraulic oil from the oil tank 100 or return hydraulic oil to the oil tank 100 through oil pipe 1, while the rod chamber can draw hydraulic oil from the oil tank 100 or return hydraulic oil to the oil tank 100 through oil pipe 2, thereby compressing and extending the piston of the balancing oil cylinder. In the energized state, electromagnetic reversing valve 1 410 simultaneously closes oil pipe 1 and oil pipe 2. At this time, the hydraulic oil in the rodless chamber and the rod chamber is fixed, and the piston of the balancing oil cylinder is locked and cannot move. It should be understood that the time spent harvesting and moving grain harvesters is generally longer than the time spent unloading grain. Therefore, during harvesting and moving, electromagnetic reversing valve 1 410 is in the de-energized state, and during unloading, electromagnetic reversing valve 1 410 is in the energized state. This can significantly reduce the energized time of electromagnetic reversing valve 1 410, thereby reducing energy consumption.

[0031] Optionally, in another embodiment, when powered on, the electromagnetic reversing valve 410 opens the oil pipe 1 and the oil pipe 2 at the same time, and the rodless chamber draws hydraulic oil from the oil tank 100 through the oil pipe 1 or returns the hydraulic oil to the oil tank 100, and the rod chamber draws hydraulic oil from the oil tank 100 through the oil pipe 2 or returns the hydraulic oil to the oil tank 100, thereby compressing and extending the piston of the balancing cylinder; when powered off, the electromagnetic reversing valve 410 closes the oil pipe 1 and the oil pipe 2 at the same time, and at this time the hydraulic oil in the rodless chamber and the rod chamber is fixed, and the piston of the balancing cylinder is locked and cannot move.

[0032] like Figure 1 As shown, in this embodiment, the first oil circuit 200 also includes a return oil pipe 1, which is connected to the oil delivery pipe 1 and the fuel tank 100. The pressure relief assembly includes a relief valve 1 510 disposed on the return oil pipe 1, which is configured to open the return oil pipe 1 when the oil pressure in the oil delivery pipe 1 exceeds a preset pressure. Specifically, during tipping unloading, when the oil pressure in the oil delivery pipe 1 exceeds a preset pressure, the relief valve 1 510 opens the return oil pipe 1 under the action of the preset pressure, allowing the hydraulic oil in the oil delivery pipe 1 to flow back through the return oil pipe 1 to the fuel tank 100, thereby achieving pressure relief and storage. It should be understood that when the solenoid reversing valve 1 410 closes the oil delivery pipe 1 and the relief valve 1 510 opens the return oil pipe 1, the rodless chamber, the oil delivery pipe 1, the return oil pipe 1, and the fuel tank 100 are sequentially connected.

[0033] like Figure 1As shown, in this embodiment, the second oil circuit 300 also includes a second oil return pipe, which is connected to the second oil delivery pipe and the fuel tank 100, respectively. The pressure relief assembly includes a second relief valve 520 disposed on the second oil return pipe, which is configured to open the second oil return pipe when the oil pressure in the second oil delivery pipe exceeds a preset pressure. Specifically, during tipping unloading, when the oil pressure in the second oil delivery pipe exceeds a preset pressure, the second relief valve 520 opens the second oil return pipe under the action of the preset pressure, allowing the hydraulic oil in the second oil delivery pipe to flow back into the fuel tank 100 through the second oil return pipe, thereby achieving pressure relief and storage. It should be understood that when the second solenoid reversing valve 440 closes the second oil delivery pipe and the second relief valve 520 opens the second oil return pipe, the rodless chamber, the second oil delivery pipe, the second oil return pipe, and the fuel tank 100 are sequentially connected.

[0034] like Figure 1 As shown, in this embodiment, the hydraulic control system further includes a first oil-replenishing component connected to the oil pipe 1 and the oil tank 100, respectively, for replenishing hydraulic oil into the rodless cavity, and a second oil-replenishing component connected to the oil pipe 2 and the oil tank 100, respectively, for replenishing hydraulic oil into the rod cavity. Specifically, when the piston of the balancing oil cylinder is pulled outward, while the hydraulic oil is replenished into the rodless cavity through the oil pipe 1, the hydraulic oil can also be replenished into the rodless cavity through the first oil-replenishing component, thereby achieving rapid oil replenishment, increasing the speed at which the balancing oil cylinder extends outward, so that the rear vehicle body can quickly swing and reduce shock relative to the middle vehicle body; when the balancing oil cylinder is compressed and retracted inward, while the hydraulic oil is replenished into the rod cavity through the oil pipe 2, the hydraulic oil can also be replenished into the rod cavity through the second oil-replenishing component, thereby achieving rapid oil replenishment, increasing the speed at which the balancing oil cylinder retracts inward, so that the rear vehicle body can quickly swing and reduce shock relative to the middle vehicle body.

[0035] like Figure 1 As shown, in this embodiment, the first oil replenishment component includes an oil replenishment pipe 1, which is connected to the oil delivery pipe 1 and the oil tank 100, and a one-way valve 1 610 arranged on the oil replenishment pipe 1 to ensure unidirectional flow of hydraulic oil into the rodless chamber. Specifically, when the piston of the balance cylinder is pulled outward, the hydraulic oil in the oil tank 100 is transported through the oil replenishment pipe 1 to the oil delivery pipe 1, thereby achieving rapid oil replenishment of the rodless chamber. The one-way flow of hydraulic oil is also prevented by the one-way valve 1 610, preventing the hydraulic oil from flowing back into the oil tank 100 through the oil replenishment pipe 1 when the oil delivery pipe 1 is closed.

[0036] like Figure 1 As shown, in this embodiment, the second oil replenishment component includes a second oil replenishment pipe, which is connected to the second oil delivery pipe and the oil tank 100 respectively, and a second check valve 620 arranged on the second oil replenishment pipe, which is used to ensure a one-way flow of hydraulic oil into the rod chamber. Specifically, when the balance cylinder contracts inward under pressure, the hydraulic oil in the oil tank 100 is transported through the second oil replenishment pipe into the second oil delivery pipe, thereby achieving rapid oil replenishment to the rod chamber. The second check valve 620 also ensures a one-way flow of hydraulic oil, preventing the hydraulic oil from flowing back into the oil tank 100 through the second oil replenishment pipe when the second oil delivery pipe is closed.

[0037] Example 2

[0038] like Figure 2 As shown, in this embodiment, the first oil circuit 200 includes an oil outlet pipe 1, which is in communication with the rodless chamber and the oil tank 100, and an oil return pipe 3, which is in communication with the oil outlet pipe 1 and the oil tank 100, respectively. The second oil circuit 300 includes an oil outlet pipe 2, which is in communication with the rod chamber and the oil tank 100, and an oil return pipe 4, which is in communication with the oil outlet pipe 2 and the oil tank 100, respectively. Specifically, the hydraulic oil in the oil tank 100 is delivered to the rodless chamber via the oil outlet pipe 1, the hydraulic oil in the rodless chamber is returned to the oil tank 100 via the oil return pipe 3, the hydraulic oil in the oil tank 100 is delivered to the rod chamber via the oil outlet pipe 2, and the hydraulic oil in the rod chamber is returned to the oil tank 100 via the oil return pipe 4, thereby achieving the extension and retraction of the balancing cylinder.

[0039] like Figure 2 As shown, in this embodiment, the pressure relief assembly includes a pilot-operated relief valve 1 530 disposed on oil return pipe 3 for opening oil return pipe 3 when the oil pressure in oil outlet pipe 1 exceeds a preset pressure, and a pilot-operated relief valve 2 540 disposed on oil return pipe 4 for opening oil return pipe 4 when the oil pressure in oil outlet pipe 2 exceeds a preset pressure. Specifically, when the oil pressure in oil outlet pipe 1 exceeds a preset pressure, pilot-operated relief valve 1 530 opens oil return pipe 3, allowing the hydraulic oil in oil outlet pipe 1 to return to the fuel tank 100 for pressure relief and storage. When the oil pressure in oil outlet pipe 2 exceeds a preset pressure, pilot-operated relief valve 2 540 opens oil return pipe 4, allowing the hydraulic oil in oil outlet pipe 2 to return to the fuel tank 100 for pressure relief and storage.

[0040] like Figure 2As shown, in this embodiment, the oil circuit opening and closing assembly includes a one-way valve three 420 arranged on the oil outlet pipe one for allowing the hydraulic oil to flow unidirectionally into the rodless chamber, a one-way valve four 430 arranged on the oil outlet pipe two for allowing the hydraulic oil to flow unidirectionally into the rod chamber, a control pipe one respectively connected to the pilot overflow valve one 530 and the return oil pipe three, an electromagnetic reversing valve two 440 arranged on the control pipe one for applying a preset pressure to the pilot overflow valve one 530 in a power-off state to open the pilot overflow valve one 530, a control pipe two respectively connected to the pilot overflow valve two 540 and the return oil pipe four, and an electromagnetic reversing valve three 450 arranged on the control pipe two for applying a preset pressure to the pilot overflow valve two 540 in a power-off state to open the pilot overflow valve two 540. Alternatively, the pilot-operated relief valve 1 530 , the control pipe 1 and the electromagnetic reversing valve 2 440 may constitute a normally open pilot-operated electromagnetic relief valve 1. Alternatively, the pilot-operated relief valve 2 540 , the control pipe 2 and the electromagnetic reversing valve 3 450 may constitute a normally open pilot-operated electromagnetic relief valve 2. Specifically, during harvesting and transfer, the hydraulic oil in the oil tank 100 can be transported to the rodless chamber or the rod chamber through the oil outlet pipe 1 or the oil outlet pipe 2, and the electromagnetic reversing valve 2 440 and the electromagnetic reversing valve 3 450 are both in the power-off state. A preset pressure is applied to the pilot overflow valve 1 530 and the pilot overflow valve 2 540 to open the pilot overflow valve 1 530 and the pilot overflow valve 2 540. The hydraulic oil in the rodless chamber or the rod chamber can flow back to the oil tank 100 through the return oil pipe 3 or the return oil pipe 4, thereby making the balancing cylinder extend and retract to achieve swing shock absorption; when unloading grain, the electromagnetic reversing valve 2 440 and the electromagnetic reversing valve 3 450 are both in the power-on state. At this time, under the action of one-way valve three 420 and one-way valve four 430, the hydraulic oil in the oil outlet pipe one and the oil return pipe two cannot be directly transported to the oil tank 100, and under the action of pilot relief valve one 530 and pilot relief valve two 540, the hydraulic oil in the oil outlet pipe one or the oil return pipe two cannot flow back to the oil tank 100 through the return pipe three or the return pipe four. The hydraulic oil in the rod chamber and the rodless chamber is fixed, and the balancing cylinder is locked to avoid rollover due to excessive eccentric load. When the oil pressure in the oil outlet pipe one or the oil outlet pipe two is higher than the preset pressure, the pilot relief valve one 530 or the pilot relief valve two 540 opens to achieve pressure relief and storage to prevent pipe burst and rollover.

[0041] like Figure 3 and Figure 4 As shown, the grain harvester of this embodiment includes the aforementioned chassis balancing hydraulic control system. Specifically, by adopting the aforementioned chassis balancing hydraulic control system in the grain harvester, the safety of the hydraulic control system during grain unloading is improved, and pipe burst and rollover are avoided. The harvester has strong practicality and is suitable for widespread promotion and application.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A hydraulic control system for chassis balancing, for installation on a chassis, wherein the chassis comprises a front body, an intermediate body connected to the front body, a rear body rotatably connected to the intermediate body, and a balancing oil cylinder connected to the intermediate body and the rear body, respectively. The balancing oil cylinder comprises a rodless chamber and a rod chamber, and is characterized in that: The hydraulic control system comprises an oil tank (100), a first oil circuit (200) respectively connected to the rodless chamber and the oil tank (100), a second oil circuit (300) respectively connected to the rod chamber and the oil tank (100), an oil circuit opening and closing component for simultaneously opening or closing the first oil circuit (200) and the second oil circuit (300), and a pressure relief component respectively arranged on the first oil circuit (200) and the second oil circuit (300) for returning the hydraulic oil in the first oil circuit (200) or the second oil circuit (300) to the oil tank (100) when the oil pressure in the first oil circuit (200) or the second oil circuit (300) is higher than a preset pressure; The first oil circuit (200) includes an oil delivery pipe 1 respectively communicating with the rodless chamber and the oil tank (100), and the second oil circuit (300) includes an oil delivery pipe 2 respectively communicating with the rod chamber and the oil tank (100); The hydraulic control system further comprises a first oil replenishing component connected to the first oil delivery pipe and the oil tank (100) for replenishing hydraulic oil into the rodless cavity, and a second oil replenishing component connected to the second oil delivery pipe and the oil tank (100) for replenishing hydraulic oil into the rod cavity. The first oil replenishing component comprises an oil replenishing pipe 1 connected to the oil delivery pipe 1 and the oil tank (100) respectively, and a one-way valve 1 (610) arranged on the oil replenishing pipe 1 and used for allowing the hydraulic oil to flow unidirectionally into the rodless chamber; The second oil replenishing component comprises an oil replenishing pipe 2 connected to the oil delivery pipe 2 and the oil tank (100) respectively, and a one-way valve 2 (620) arranged on the oil replenishing pipe 2 for allowing the hydraulic oil to flow unidirectionally into the rod chamber.

2. The hydraulic control system for chassis balancing according to claim 1, characterized in that The oil circuit opening and closing assembly includes an electromagnetic reversing valve 1 (410) connected to the oil pipeline 1 and the oil pipeline 2 respectively and used to open or close the oil pipeline 1 and the oil pipeline 2 at the same time.

3. The hydraulic control system for chassis balancing according to claim 2, characterized in that: The first oil circuit (200) further includes an oil return pipe (1) connected to the oil delivery pipe (1) and the oil tank (100) respectively. The pressure relief assembly includes an overflow valve (510) arranged on the oil return pipe (1) and used to open the oil return pipe (1) when the oil pressure in the oil delivery pipe (1) exceeds a preset pressure.

4. The hydraulic control system for chassis balancing according to claim 2, characterized in that: The second oil circuit (300) further includes a second oil return pipe connected to the second oil delivery pipe and the oil tank (100) respectively. The pressure relief assembly includes a second overflow valve (520) arranged on the second oil return pipe and used to open the second oil return pipe when the oil pressure in the second oil delivery pipe is higher than a preset pressure.

5. The hydraulic control system for chassis balancing according to claim 1, characterized in that: The first oil circuit (200) includes an oil outlet pipe 1 connected to the rodless chamber and the oil tank (100) respectively, and an oil return pipe 3 connected to the oil outlet pipe 1 and the oil tank (100) respectively. The second oil circuit (300) includes an oil outlet pipe 2 connected to the rod chamber and the oil tank (100) respectively, and an oil return pipe 4 connected to the oil outlet pipe 2 and the oil tank (100) respectively.

6. The hydraulic control system for chassis balancing according to claim 5, characterized in that: The pressure relief assembly includes a pilot-operated overflow valve (530) arranged on the return oil pipe (3) for opening the return oil pipe (3) when the oil pressure in the outlet oil pipe (1) is higher than a preset pressure, and a pilot-operated overflow valve (540) arranged on the return oil pipe (4) for opening the return oil pipe (4) when the oil pressure in the outlet oil pipe (2) is higher than a preset pressure.

7. The hydraulic control system for chassis balancing according to claim 6, characterized in that: The oil circuit opening and closing assembly includes a one-way valve three (420) arranged on the oil outlet pipe one for allowing the hydraulic oil to flow in one direction into the rodless chamber, a one-way valve four (430) arranged on the oil outlet pipe two for allowing the hydraulic oil to flow in one direction into the rod chamber, a control pipe one respectively connected to the pilot relief valve one (530) and the return oil pipe three, an electromagnetic reversing valve two (440) arranged on the control pipe one for applying a preset pressure to the pilot relief valve one (530) in a power-off state to open the pilot relief valve one (530), a control pipe two respectively connected to the pilot relief valve two (540) and the return oil pipe four, and an electromagnetic reversing valve three (450) arranged on the control pipe two for applying a preset pressure to the pilot relief valve two (540) in a power-off state to open the pilot relief valve two (540).

8. A grain harvester, characterized in that: The hydraulic control system for chassis balancing comprises the one described in any one of claims 1-7.

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