Clutch emergency disengagement hydraulic system of harvester and harvester

Abstract

The utility model relates to the technical field of agricultural machinery, in particular to a clutch emergency disengagement hydraulic system of a harvester, which comprises a clutch emergency disengagement unit, and the clutch emergency disengagement unit comprises a two-position three-way electromagnetic directional valve, a one-way valve and an energy accumulator. The outlet end of the hydraulic oil tank is communicated with the gear pump, the outlet end of the gear pump is communicated with a port P, a first outlet and a second outlet are branched from the port P, the first outlet is communicated with the energy accumulator after passing through the one-way valve, the second outlet is communicated with the two-position three-way electromagnetic reversing valve, and the two-position three-way electromagnetic reversing valve is communicated with a first connector of the three-position four-way electromagnetic reversing valve through a port A; the other three interfaces of the three-position four-way electromagnetic directional valve are respectively communicated with a left hydraulic lock, a right hydraulic lock and a hydraulic oil tank; on the premise that the engine is not started, the action of the main clutch oil cylinder is realized, so that the main driving belt is separated, the condition that the engine needs to be started with load when being started again is avoided, the damage to the engine starting with load is reduced, and the restarting of the engine is safer.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery, in particular to a clutch emergency disengagement hydraulic system of a harvester and the harvester. Background Art

[0002] At present, the power transmission of the whole working device of wheeled harvesters (some models of grain combine harvesters and corn harvesters) relies on belt transmission. The belt is tightened by pushing the pulley tensioning mechanism through the extension and contraction of the hydraulic cylinder, thereby transmitting the engine power to the parts of the whole working device of the machine and driving the parts to rotate. In order to ensure the stability of the belt tension, hydraulic locks are set at the two oil ports of the hydraulic cylinder (the two oil ports lead to the rod chamber and rodless chamber of the cylinder respectively) to prevent the hydraulic cylinder from automatically retracting. When the engine is turned off due to sudden load surges such as material accumulation, the hydraulic lock cannot be opened without engine power, and the hydraulic cylinder cannot move, so it is impossible to control the belt from the tensioned state to the relaxed state. When the engine is started again in this way, it belongs to the load starting condition, which causes greater damage to the engine and may also fail to start the engine again.

[0003] Technical problems existing in the prior art:

[0004] 1. When the working device clutch of the existing agricultural harvesting machinery accidentally shuts down the engine, the main clutch hydraulic cylinder cannot move and the tensioning wheel cannot be disengaged. When the engine is restarted, it needs to be started with load, which causes great damage to the engine and may also make it impossible to restart the engine.

[0005] 2. The main clutch cannot be disengaged, and when the engine is started again, it will drive the working parts to rotate, posing a safety hazard. Utility Model Content

[0006] The purpose of the utility model is to provide a clutch emergency disengagement hydraulic system for a harvester, which can solve at least one technical problem existing in the prior art.

[0007] Another object of the utility model is to provide a harvester that can solve at least one technical problem existing in the prior art.

[0008] The technical solution of the utility model is achieved in this way:

[0009] A clutch emergency disengagement hydraulic system for a harvester, comprising a gear pump, a three-position four-way electromagnetic reversing valve, a hydraulic lock, a main clutch oil cylinder, and a hydraulic oil tank, wherein the three-position four-way electromagnetic reversing valve has a left coil and a right coil; the hydraulic lock is divided into a left hydraulic lock and a right hydraulic lock, and the two oil ports of the main clutch oil cylinder are respectively provided with the left hydraulic lock and the right hydraulic lock, and further comprising a clutch emergency disengagement unit, wherein the clutch emergency disengagement unit comprises a two-position three-way electromagnetic reversing valve, a one-way valve, and an accumulator;

[0010] The clutch emergency release unit has an oil inlet and an oil outlet, the oil inlet of the clutch emergency release unit is port P, and the oil outlet of the clutch emergency release unit is port A;

[0011] The outlet end of the hydraulic oil tank leads to the gear pump, and the outlet end of the gear pump leads to the P port, from which the first outlet and the second outlet are branched. The first outlet of the P port leads to the accumulator after passing through the one-way valve, and the second outlet of the P port leads to the two-position three-way solenoid reversing valve. The two-position three-way solenoid reversing valve is connected to the first interface of the three-position four-way solenoid reversing valve through the A port, and the second interface, the third interface, and the fourth interface of the three-position four-way solenoid reversing valve are connected to the left hydraulic lock, the right hydraulic lock, and the hydraulic oil tank respectively, wherein the rodless chamber of the main clutch cylinder is connected to the left hydraulic lock, and the rod chamber of the main clutch cylinder is connected to the right hydraulic lock.

[0012] Furthermore, when the engine suddenly shuts down and the main clutch needs to be disengaged: the left coil of the three-position four-way electromagnetic reversing valve receives an electrical signal, and the coil of the two-position three-way electromagnetic reversing valve also receives an electrical signal.

[0013] Furthermore, the flow direction of the hydraulic oil is as follows: the hydraulic oil is output by the accumulator, and all the hydraulic oil can only pass through the two-position three-way solenoid reversing valve and flow out from port A, and then enter the oil inlet of the right hydraulic lock after passing through the three-position four-way solenoid reversing valve, and the hydraulic oil flowing out of the right hydraulic lock enters the rod chamber of the main clutch cylinder again. After the pressure of the hydraulic oil gradually increases and reaches the opening pressure of the hydraulic lock, the hydraulic oil opens the left hydraulic lock through the pilot line of the left hydraulic lock. At this time, the oil in the rodless chamber of the main clutch cylinder enters the three-position four-way solenoid reversing valve through the left hydraulic lock and flows out from the fourth interface, and then flows back to the 7 hydraulic oil tank.

[0014] Furthermore, when the engine is in the starting state and needs to engage the main clutch: the right coil of the three-position four-way electromagnetic reversing valve receives an electrical signal, and the coil of the two-position three-way electromagnetic reversing valve has no electrical signal and works in the initial position.

[0015] Furthermore, the flow direction of the hydraulic oil is as follows: the hydraulic oil is output by the gear pump, and after the hydraulic oil enters through the P port of the clutch emergency disengagement unit, a part of the hydraulic oil passes through the one-way valve and enters the accumulator, and the other part of the hydraulic oil flows out from the A port through the two-position three-way solenoid reversing valve, and then enters the three-position four-way solenoid reversing valve and flows out from the second interface, and then enters the rodless chamber of the main clutch cylinder through the left hydraulic lock. When the oil pressure of the hydraulic oil increases and reaches the opening pressure of the hydraulic lock, the hydraulic oil opens the right hydraulic lock through the pilot line of the right hydraulic lock, and the hydraulic oil in the rod chamber of the main clutch cylinder enters the three-position four-way solenoid reversing valve through the right hydraulic lock and then flows out from the fourth interface back to the hydraulic oil tank.

[0016] Furthermore, when the engine is started and the main clutch needs to be disengaged: the left coil of the three-position four-way solenoid reversing valve receives an electrical signal, and the coil of the two-position three-way solenoid reversing valve has no electrical signal and works in the initial position.

[0017] Furthermore, the flow direction of the hydraulic oil is as follows: the hydraulic oil is output by the gear pump, and after the hydraulic oil enters through the P port of the clutch emergency disengagement unit, a part of the hydraulic oil passes through the one-way valve and enters the accumulator, and the other part of the hydraulic oil flows out from the A port through the two-position three-way solenoid reversing valve, and then enters the three-position four-way solenoid reversing valve and flows out from the third interface, and then flows into the rod chamber of the main clutch cylinder through the right hydraulic lock. When the oil pressure of the hydraulic oil increases and reaches the opening pressure of the hydraulic lock, the hydraulic oil opens the left hydraulic lock through the pilot line of the left hydraulic lock, and the hydraulic oil in the rodless chamber of the main clutch cylinder enters the three-position four-way solenoid reversing valve through the left hydraulic lock and then flows out from the fourth interface back to the hydraulic oil tank.

[0018] Furthermore, it also includes an overflow pipe and an overflow valve. The fourth interface is also provided with the overflow pipe leading to the P port, and the overflow valve is provided on the overflow pipe.

[0019] Furthermore, an oil suction filter is provided between the outlet end of the hydraulic oil tank and the gear pump.

[0020] A harvester comprises a clutch emergency disengagement hydraulic system of the harvester.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] In the present application, by adding a clutch emergency disengagement unit, when the engine suddenly stalls and the main clutch needs to be disengaged, the hydraulic oil is output by the accumulator, and all the hydraulic oil can only pass through the three-position four-way solenoid reversing valve and flow out from port A, and then enter the oil inlet of the right hydraulic lock after passing through the three-position four-way solenoid reversing valve. The hydraulic oil flowing out of the right hydraulic lock enters the rod chamber of the main clutch cylinder again. At this time, the pressure of the hydraulic oil will increase. After the pressure of the hydraulic oil gradually increases and reaches the opening pressure of the hydraulic lock, the hydraulic oil passes through the pilot line of the left hydraulic lock to open the left hydraulic lock; therefore, without starting the engine, the main clutch cylinder is actuated, thereby disengaging the main drive belt, avoiding the need to start the engine with load when starting it again, reducing the damage to the engine starting with load, and making it safer to start the engine again. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, 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 utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the hydraulic principle of the clutch emergency disengagement hydraulic system of the utility model.

[0025] In the figure:

[0026] 1-gear pump; 2-clutch emergency release unit; 3-three-position four-way solenoid reversing valve; 4a-left hydraulic lock; 4b-right hydraulic lock; 5-main clutch cylinder; 6-overflow valve; 7-hydraulic oil tank; 8-oil suction filter; 9-two-position three-way solenoid reversing valve; 10-check valve; 11-accumulator; 12-return pipe; 13-overflow pipe. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] Example 1

[0035] Reference Figure 1The present embodiment provides a clutch emergency release hydraulic system for a harvester, including a gear pump 1, a three-position four-way electromagnetic reversing valve 3, a hydraulic lock, a main clutch cylinder 5, a relief valve 6, a hydraulic oil tank 7, an oil suction filter 8 and a clutch emergency release unit 2.

[0036] Among them, the valve core of the three-position four-way electromagnetic reversing valve 3 has three working positions, namely the left position, the static position (or the initial position) and the right position. The three-position four-way electromagnetic reversing valve 3 has a left coil and a right coil. The left coil and the right coil correspond to the two working positions in the internal pipeline of the three-way four-way electromagnetic reversing valve, that is, when the left coil receives an electrical signal, the valve core function works in the left position; when the right coil receives an electrical signal, the valve core function works in the right position. It should be noted that the "left" and "right" in this embodiment are based on Figure 1 The orientation in the figure is defined only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] The hydraulic lock is divided into a left hydraulic lock 4a and a right hydraulic lock 4b. The two oil ports of the main clutch cylinder 5 are respectively provided with the left hydraulic lock 4a and the right hydraulic lock 4b. Specifically, the rodless chamber of the main clutch cylinder 5 is connected with the left hydraulic lock 4a, and the rod chamber of the main clutch cylinder 5 is connected with the right hydraulic lock 4b.

[0038] The clutch emergency release unit 2 includes a two-position three-way electromagnetic reversing valve 9 , a one-way valve 10 and an accumulator 11 .

[0039] The clutch emergency release unit 2 has an oil inlet and an oil outlet. The oil inlet of the clutch emergency release unit 2 is the P port, and the oil outlet of the clutch emergency release unit 2 is the A port.

[0040] The various components in the entire hydraulic system are connected to each other through hydraulic pipelines. Specifically, the outlet end of the hydraulic oil tank 7 leads to the gear pump 1, and the outlet end of the gear pump 1 leads to the P port, from which there are a first outlet and a second outlet. The first outlet of the P port leads to the accumulator 11 after passing through the one-way valve 10, and the second outlet of the P port leads to the two-position three-way electromagnetic reversing valve 9. The two-position three-way electromagnetic reversing valve 9 is connected to the first interface of the three-position four-way electromagnetic reversing valve 3 through the A port, and the second interface, the third interface, and the fourth interface of the three-position four-way electromagnetic reversing valve 3 are connected to the left hydraulic lock 4a, the right hydraulic lock 4b, and the hydraulic oil tank 7, respectively. Figure 1In the description of the example, the first interface, the second interface, the third interface, and the fourth interface are respectively located at the lower left corner, the upper left corner, the upper right corner, and the lower right corner of the three-position four-way electromagnetic reversing valve 3. The rodless chamber of the main clutch oil cylinder 5 is connected to the left hydraulic lock 4a, and the rod chamber of the main clutch oil cylinder 5 is connected to the right hydraulic lock 4b; the fourth interface of the three-position four-way electromagnetic reversing valve 3 is connected to the hydraulic oil tank 7 through the return pipe 12. An overflow port is opened on the return pipe 12, and the overflow port is connected to the P port through the overflow pipe 13, and an overflow valve 6 is set on the overflow pipe 13. An oil suction filter 8 is also arranged between the outlet end of the hydraulic oil tank 7 and the inlet end of the gear pump 1.

[0041] When the engine suddenly shuts down and the main clutch needs to be disengaged: the left coil of the three-position four-way electromagnetic reversing valve 3 receives an electrical signal, and its valve core function works in the left position; the coil of the two-position three-way electromagnetic reversing valve 9 also receives an electrical signal, and its valve core function works in the gain potential. At this time, the flow direction of the hydraulic oil is: the hydraulic oil (or pressure oil) is output by the accumulator 11. At this time, due to the one-way effect of the one-way valve 10, the hydraulic oil cannot flow through the one-way valve 10. All the hydraulic oil can only enter from the two-position three-way electromagnetic reversing valve 9 and flow out from port A, and then pass through the three-position four-way electromagnetic reversing valve 3, enter from the first interface (the first interface is the oil inlet) of the three-position four-way electromagnetic reversing valve 3, and then flow out from the third interface of the three-position four-way electromagnetic reversing valve 3 and enter the oil inlet of the right hydraulic lock 4b, and then the hydraulic oil flowing out from the right hydraulic lock 4b enters the rod chamber of the main clutch cylinder 5. At this time, the hydraulic oil pressure will gradually increase. After the hydraulic oil pressure gradually increases and reaches the hydraulic lock opening pressure, the hydraulic oil opens the left hydraulic lock 4a through the pilot line of the left hydraulic lock 4a. At this time, the oil in the rodless chamber of the main clutch cylinder 5 enters the three-position four-way electromagnetic reversing valve 3 from the second interface through the left hydraulic lock 4a, and then flows out from the fourth interface, and then flows back to the hydraulic oil tank 7.

[0042] In this state, when the engine suddenly shuts down and the main clutch needs to be disengaged, the hydraulic oil is output by the accumulator 11, and all the hydraulic oil can only pass through the three-position four-way electromagnetic reversing valve 3 and flow out from port A, and then enter the oil inlet of the right hydraulic lock 4b after passing through the three-position four-way electromagnetic reversing valve 3. The hydraulic oil flowing out of the right hydraulic lock 4b enters the rod chamber of the main clutch cylinder 5. At this time, the pressure of the hydraulic oil will increase. After the pressure of the hydraulic oil gradually increases and reaches the hydraulic lock opening pressure, the hydraulic oil passes through the pilot line of the left hydraulic lock 4a to open the left hydraulic lock 4a; therefore, without starting the engine, the main clutch cylinder 5 is actuated, thereby disengaging the main drive belt, avoiding the need to start the engine with load when starting it again, reducing the damage to the engine with load starting, and making it safer to start the engine again.

[0043] When the engine is in the starting state and needs to engage the main clutch: the right coil of the three-position four-way solenoid reversing valve 3 receives an electrical signal, and its valve core function works in the right position; the coil of the two-position three-way solenoid reversing valve 9 has no electrical signal (no electrical signal is received) and works in the initial position. At this time, the flow direction of the hydraulic oil is as follows: the gear pump 1 outputs the hydraulic oil, and after the hydraulic oil enters through the P port of the clutch emergency disengagement unit 2, a small part of the hydraulic oil passes through the one-way valve 10 and enters the accumulator 11, and another large part of the hydraulic oil flows out from the A port through the two-position three-way electromagnetic reversing valve 9, and then enters the three-position four-way electromagnetic reversing valve 3 from the first interface and flows out from the second interface, and then enters the rodless chamber of the main clutch cylinder 5 through the left hydraulic lock 4a. At this time, the hydraulic oil pressure will gradually increase. When the oil pressure of the hydraulic oil increases and reaches the hydraulic lock opening pressure, the hydraulic oil opens the right hydraulic lock 4b through the pilot line of the right hydraulic lock 4b, and then the hydraulic oil in the rod chamber of the main clutch cylinder 5 enters the three-position four-way electromagnetic reversing valve 3 from the third interface through the right hydraulic lock 4b, and then flows out from the fourth interface, and then returns to the hydraulic oil tank 7 through the reflux pipe 12.

[0044] When the engine is started and the main clutch needs to be disengaged: the left coil of the three-position four-way solenoid reversing valve 3 receives an electrical signal, and its valve core function works in the left position; the coil of the two-position three-way solenoid reversing valve 9 has no electrical signal and works in the initial position. At this time, the flow direction of the hydraulic oil is as follows: the gear pump 1 outputs the hydraulic oil, and after the hydraulic oil enters through the P port of the clutch emergency disengagement unit 2, a small part of the hydraulic oil passes through the one-way valve 10 and enters the accumulator 11, and another large part of the hydraulic oil flows out from the A port through the two-position three-way electromagnetic reversing valve 9, and then enters the three-position four-way electromagnetic reversing valve 3 from the first interface and flows out from the third interface, and then flows into the rod chamber of the main clutch cylinder 5 through the right hydraulic lock 4b. At this time, the hydraulic oil pressure will gradually increase. When the oil pressure of the hydraulic oil increases and reaches the hydraulic lock opening pressure, the hydraulic oil opens the left hydraulic lock 4a through the pilot line of the left hydraulic lock 4a, and the hydraulic oil in the rodless chamber of the main clutch cylinder 5 enters the three-position four-way electromagnetic reversing valve 3 from the second interface through the left hydraulic lock 4a, and then flows out from the fourth interface, and flows back to the hydraulic oil tank 7 through the return pipe 12.

[0045] Example 2

[0046] A harvester comprises a clutch emergency disengagement hydraulic system of the harvester.

[0047] The technical solution of this application mainly solves the following problems:

[0048] 1. When the working device clutch of the existing agricultural harvesting machinery accidentally shuts down the engine, the main clutch hydraulic cylinder cannot be actuated and the tensioning wheel cannot be disengaged, so the engine needs to be started with load when it is restarted.

[0049] 2. The main clutch cannot be disengaged, and when the engine is started again, it will drive the working parts to rotate, posing a safety hazard.

[0050] The beneficial effects of the technical solution of the utility model are:

[0051] The present application can realize that when the engine suddenly stops unexpectedly, the main clutch oil cylinder 5 can be actuated without starting the engine, thereby disengaging the main drive belt, avoiding the need to start the engine with load when restarting the engine, reducing damage to the engine with load, and making the restart of the engine safer.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

[0053] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the above claims, any one of the claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present invention and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0055] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A clutch emergency disengagement hydraulic system for a harvester, comprising a gear pump (1), a three-position four-way electromagnetic reversing valve (3), a hydraulic lock, a main clutch cylinder (5), and a hydraulic oil tank (7), wherein the three-position four-way electromagnetic reversing valve (3) has a left coil and a right coil; the hydraulic lock is divided into a left hydraulic lock (4a) and a right hydraulic lock (4b), and two oil ports of the main clutch cylinder (5) are respectively provided with the left hydraulic lock (4a) and the right hydraulic lock (4b), characterized in that: It also includes a clutch emergency release unit (2), wherein the clutch emergency release unit (2) includes a two-position three-way electromagnetic reversing valve (9), a one-way valve (10) and an accumulator (11); The clutch emergency release unit (2) has an oil inlet and an oil outlet, the oil inlet of the clutch emergency release unit (2) is the P port, and the oil outlet of the clutch emergency release unit (2) is the A port; The outlet end of the hydraulic oil tank (7) leads to the gear pump (1), and the outlet end of the gear pump (1) leads to the P port. A first outlet and a second outlet are branched from the P port. The first outlet leads to the accumulator (11) after passing through the one-way valve (10). The second outlet leads to the two-position three-way electromagnetic reversing valve (9). The two-position three-way electromagnetic reversing valve (9) is connected to the first interface of the three-position four-way electromagnetic reversing valve (3) through the A port. The second interface, the third interface, and the fourth interface of the three-position four-way electromagnetic reversing valve (3) are respectively connected to the left hydraulic lock (4a), the right hydraulic lock (4b), and the hydraulic oil tank (7). The rodless chamber of the main clutch oil cylinder (5) is connected to the left hydraulic lock (4a), and the rod chamber of the main clutch oil cylinder (5) is connected to the right hydraulic lock (4b).

2. The clutch emergency release hydraulic system of the harvester according to claim 1, characterized in that: It also comprises an overflow pipe (13) and an overflow valve (6); the fourth interface is further provided with the overflow pipe (13) leading to the P port, and the overflow valve (6) is provided on the overflow pipe (13).

3. The clutch emergency release hydraulic system for a harvester according to claim 1, characterized in that: An oil suction filter (8) is also provided between the outlet end of the hydraulic oil tank (7) and the gear pump (1).

4. A harvester, characterized in that: A clutch emergency release hydraulic system for a harvester comprising any one of claims 1-3.

Images