A double-fan hydraulic system, double-fan impurity removal device and sugarcane harvester

Abstract

The present application relates to a kind of double-fan hydraulic system, double-fan impurity removal device and sugarcane harvester, the hydraulic system includes suction fan motor, centrifugal fan motor, hydraulic pump and two reversing valves, the oil port one of suction fan motor and the oil port one of centrifugal fan motor are respectively communicated with two oil outlets A by pipeline one, the oil port two of suction fan motor and the oil port two of centrifugal fan motor are respectively communicated with two oil outlets B by pipeline two;The inlet of hydraulic pump is communicated with the one end of oil inlet pipeline, and the outlet thereof is communicated with the one end of oil supply pipeline, the other end of oil supply pipeline is respectively communicated with two oil inlet ports P by pipeline three, and the other end of oil supply pipeline is also communicated with the one end of oil return pipeline;Two return ports T1 and two return ports T2 are respectively communicated with oil return pipeline by pipeline four.The present application is compact in structure, reasonable in design, can realize the effective control of double-fan motor, effectively reduce the impurity content and loss rate of sugarcane harvesting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sugarcane harvesters, in particular to a double-fan hydraulic system, a double-fan impurity removal device and a sugarcane harvester. BACKGROUND

[0002] With the development of industrial and agricultural mechanization, agricultural harvesting machinery has begun to be applied to sugarcane harvesting operations. At present, the impurity removal system of the sectioning type sugarcane harvester is a single-fan impurity removal system with a longitudinal shaft, which is driven by a hydraulic motor to rotate the fan for impurity removal. This structure is prone to extract small sections of sugarcane, and generally has a high loss rate. If the fan rotates too fast, the sugarcane entering the impurity removal system is easily extracted, resulting in an increased loss rate. If the fan rotates too slowly, the impurities entering the impurity removal system cannot be extracted, resulting in an increased impurity content. SUMMARY

[0003] The present application provides a double-fan hydraulic system, a double-fan impurity removal device and a sugarcane harvester, aiming to solve the problem of high impurity content and loss rate in the prior art.

[0004] The technical solution of the present application to solve the above technical problem is as follows:

[0005] A double-fan hydraulic system, comprising an air extraction fan motor, a centrifugal fan motor, a hydraulic pump and two reversing valves, each of the reversing valves is provided with an oil inlet P, an oil outlet A, an oil outlet B, an oil return port T1 and an oil return port T2, the oil inlet P is in communication with the oil outlet A and the oil outlet B is in communication with the oil return port T2, or the oil inlet P is in communication with the oil outlet B and the oil outlet A is in communication with the oil return port T1;

[0006] The oil port one of the air extraction fan motor and the oil port one of the centrifugal fan motor are respectively in communication with two oil outlets A through a pipeline one, and the oil port two of the air extraction fan motor and the oil port two of the centrifugal fan motor are respectively in communication with two oil outlets B through a pipeline two;

[0007] The inlet of the hydraulic pump is in communication with one end of an oil inlet pipeline, the outlet thereof is in communication with one end of an oil supply pipeline, the other end of the oil supply pipeline is in communication with two oil inlets P through a pipeline three, and the other end of the oil supply pipeline is also in communication with one end of an oil return pipeline; two oil return ports T1 and two oil return ports T2 are respectively in communication with the oil return pipeline through a pipeline four.

[0008] The beneficial effects of the present application are as follows: during operation, the oil is sent to the air extraction fan motor and the centrifugal fan motor through the two reversing valves by the hydraulic pump, the operation of the two motors is realized, and the subsequent impurity removal function is performed.

[0009] Meanwhile, by changing the positions of the two reversing valve spools, the directions of the two motor oil flows are changed, the directions of the two motors are changed, and the directions of the two fans are changed.

[0010] In addition, the hydraulic system has a speed sensor for each of the exhaust fan and the centrifugal fan, which is used to collect and feed back the speeds of the exhaust fan and the centrifugal fan.

[0011] The application has compact structure, reasonable design, and can effectively control the double-fan motor, and effectively reduce the impurity content and loss rate of the harvested sugarcane.

[0012] On the basis of the above technical solution, the application can be further improved as follows.

[0013] Further, two pressure compensators are fixedly installed on the two pipe threes; each of the reversing valves is further provided with two load feedback oil ports S in communication with the oil outlets A and B, respectively; the two load feedback oil ports S are in communication with one ends of two pipe fives, respectively; the other ends of the two pipe fives are in communication with each other, and the communication part is in communication with the spring cavity oil port of the corresponding pressure compensator through a pipe six.

[0014] The above further scheme has the beneficial effects that the two pressure compensators are used to control the constant pressure difference before and after the reversing valve, ensure the constant hydraulic oil flow through the reversing valve, and further ensure the stable speed of the exhaust fan motor and the centrifugal fan motor, and the structure is simple and reasonable.

[0015] Further, the communication part between the other ends of the two pipe fives corresponding to the reversing valve of the exhaust fan motor is fixedly installed with a shuttle valve one, and two secondary overflow valves are further provided, and the interfaces one of the two secondary overflow valves are in communication with the corresponding two pipe fives through pipes, and the interfaces two are in communication with the oil return pipe through pipes.

[0016] The above further scheme has the beneficial effects that the secondary overflow valves are used to ensure that the working pressure of the exhaust fan motor does not exceed the set value, and the shuttle valve one detects the pressures of the two load feedback oil ports S of the reversing valve, i.e., the pressures of the two oil ports of the exhaust fan motor, and sends the corresponding pressure signals to the corresponding pressure compensators, so as to ensure the constant hydraulic oil flow through the reversing valve, and further ensure the stable speed of the exhaust fan motor and the centrifugal fan motor, and the structure is simple and reasonable.

[0017] Further, the main overflow valve is fixedly installed on the oil return pipeline.

[0018] The beneficial effect of the further scheme is that when the impurity removal system is working, the oil delivered by the hydraulic pump is supplied to the two motors through the two reversing valves, and the excess oil directly returns through the main overflow valve, avoiding excessive system pressure and safe operation.

[0019] When the impurity removal system is not working, the overflow pressure of the main overflow valve is only the spring pressure, thereby ensuring that the hydraulic oil output by the hydraulic pump can return to the hydraulic oil tank through the main overflow valve at low pressure when the impurity removal system is not working, reducing system power loss.

[0020] Further, two shuttle valves two are provided, the interfaces one of the two shuttle valves two are respectively connected to the two pipelines six through pipelines, the interfaces two of the two shuttle valves two are connected to each other, and the interface three of the shuttle valve two corresponding to the centrifugal fan motor is connected to one end of the load pipeline.

[0021] The beneficial effect of the further scheme is that the pressure of the two load feedback oil ports S of the two reversing valves is detected through the two shuttle valves two, the higher pressure signal of the two pressures is transmitted to the spring cavity oil port of the valve core of the main overflow valve through the load pipeline, and the overflow pressure of the main overflow valve is dynamically controlled, thereby reducing power loss.

[0022] Further, the spring cavity oil port of the valve core of the main overflow valve is connected to the load pipeline through the pipeline seven, and an auxiliary overflow valve is further provided, the interface one of the auxiliary overflow valve is connected to the pipeline seven, and the interface two of the auxiliary overflow valve is connected to the part of the oil return pipeline between the main overflow valve and the two pipelines four connected to the oil return pipeline.

[0023] The beneficial effect of the further scheme is that the upper limit of the overflow pressure of the main overflow valve is limited to be not more than a set value through the auxiliary overflow valve, thereby ensuring the safety and reliability of the system.

[0024] Further, two buffer oil supplement valve groups are further provided, each of the buffer oil supplement valve groups comprises two buffer valves, the interfaces one of the two buffer valves are respectively connected to the corresponding pipeline one and pipeline two through pipelines eight, the two pipelines eight are connected to each other through a pipeline nine, and two unidirectional valves with opposite flow directions are fixedly installed on the pipeline nine at intervals; the interfaces two of the two buffer valves are connected to each other through a pipeline ten, the pipeline ten is connected to the oil return pipeline through a pipeline eleven; the interface three of the shuttle valve two corresponding to the centrifugal fan motor is connected to the corresponding pipeline eleven through a pipeline twelve, and the pipeline eleven is further connected to the part of the pipeline nine between the two unidirectional valves.

[0025] The beneficial effect of the further scheme is that each buffer valve is matched with two one-way valves respectively, so as to prevent system pressure impact and air suction of the oil circuit when the fan stops, prolong the service life of the fan and reduce the cost.

[0026] Further, the oil tank is further included, and the other end of the oil inlet pipeline and the other end of the oil return pipeline are communicated with the oil tank respectively.

[0027] The beneficial effect of the further scheme is that the oil tank is used for oil supply of the whole system, and the oil after system operation is recovered, so that the oil circulation is realized, resources are saved, and the cost is reduced.

[0028] The application also relates to a double-fan impurity removal device.

[0029] The beneficial effect of the further scheme is that the double-fan impurity removal device provided by the application is compact in structure and reasonable in design, and can effectively control the double-fan motor and effectively reduce the impurity content and loss rate of the sugarcane harvesting.

[0030] The application also relates to a sugarcane harvester.

[0031] The beneficial effect of the further scheme is that the sugarcane harvester provided by the application is compact in structure and reasonable in design, and can effectively control the double-fan motor and effectively reduce the impurity content and loss rate of the sugarcane harvesting. BRIEF DESCRIPTION OF DRAWINGS

[0032] Fig. 1 It is a principle diagram when the two fan motors of the system run in the forward direction;

[0033] Fig. 2 It is a principle diagram when the two fan motors of the system run in the reverse direction;

[0034] Fig. 3 It is a principle diagram when the system does not run.

[0035] In the drawings, the components represented by the numbers are listed as follows:

[0036] 1, suction fan motor; 2, centrifugal fan motor; 3, main overflow valve; 4, reversing valve; 5, hydraulic pump; 6, pressure compensator; 7, buffer valve; 8, secondary overflow valve; 9, oil inlet pipeline; 10, oil supply pipeline; 11, oil return pipeline; 12, shuttle valve 1; 13, shuttle valve 2; 14, load pipeline; 15, auxiliary overflow valve; 16, one-way valve; 17, oil tank; 18, throttle valve. DETAILED DESCRIPTION

[0037] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other in the case of no conflict.

[0038] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0039] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0041] Embodiment 1

[0042] As Figs. 1 to 3 shown, the present embodiment provides a double-fan hydraulic system, which comprises an exhaust fan motor 1, a centrifugal fan motor 2, a hydraulic pump 5 and two reversing valves 4, each of which is provided with an oil inlet P, an oil outlet A, an oil outlet B, an oil return port T1 and an oil return port T2, the oil inlet P is in communication with the oil outlet A and the oil outlet B is in communication with the oil return port T2, or the oil inlet P is in communication with the oil outlet B and the oil outlet A is in communication with the oil return port T1;

[0043] The oil port one of the exhaust fan motor 1 and the oil port one of the centrifugal fan motor 2 are respectively communicated with two oil outlets A through pipelines one, and the oil port two of the exhaust fan motor 1 and the oil port two of the centrifugal fan motor 2 are respectively communicated with two oil outlets B through pipelines two;

[0044] The inlet of the hydraulic pump 5 is communicated with one end of the oil inlet pipeline 9, the outlet is communicated with one end of the oil supply pipeline 10, the other end of the oil supply pipeline 10 is communicated with the two oil inlet ports P through the pipeline three respectively, and the other end of the oil supply pipeline 10 is also communicated with one end of the oil return pipeline 11; the two oil return ports T1 and the two oil return ports T2 are communicated with the oil return pipeline 11 through the pipeline four respectively.

[0045] During operation, the oil is sent to the exhaust fan motor 1 and the centrifugal fan motor 2 through the hydraulic pump 5 and the two reversing valves 4, so that the two motors are operated to realize the subsequent impurity removal function.

[0046] At the same time, by changing the position of the valve core of the two reversing valves 4, the direction of the oil flow of the two motors is changed, so that the direction of the rotation of the two motors is changed, and the direction of the rotation of the two fans is changed.

[0047] In addition, the hydraulic system has a speed sensor for each of the exhaust fan and the centrifugal fan, which is used to collect and feedback the speed of the exhaust fan and the centrifugal fan. When the impurity removal system is working, the collected speed signal is displayed on the central control screen. The driver changes the current value input to the reversing valve to change the opening of the valve core, so that the flow of hydraulic oil flowing into the two motors is changed, and then the speed of the two motors is controlled to realize stepless speed regulation.

[0048] Preferably, in the embodiment, the two reversing valves 4 are preferably proportional reversing valves.

[0049] Preferably, in the embodiment, the oil return port T1 and the oil return port T2 of each reversing valve 4 can be merged into a branch pipeline, and then the two branch pipelines of the two reversing valves can be merged into a main pipeline which is communicated with the oil return pipeline 11. This design is reasonable, the pipeline distribution is reasonable, the space is saved, and the cost is reduced.

[0050] Alternatively, the oil return port T1 and the oil return port T2 of each reversing valve 4 can also be communicated with the oil return pipeline through separate pipelines, but this scheme adopts more pipelines and occupies more space.

[0051] Preferably, in the embodiment, the two oil inlet ports P can be merged into a pipeline which is communicated with the other end of the oil supply pipeline 10, which is reasonable in design and saves space.

[0052] It should be noted that the two motors, the two reversing valves and the hydraulic pump are all existing technologies, and their specific structures and principles will not be described here.

[0053] The embodiment has compact structure, reasonable design, can realize effective control of the double fan motors, and effectively reduces the impurity content and loss rate of sugarcane harvesting.

[0054] Embodiment 2

[0055] In this embodiment, two pressure compensators 6 are fixedly installed on two of the third pipelines, and each of the reversing valves 4 is further provided with two load feedback oil ports S in communication with the oil outlet A and the oil outlet B respectively, and the two load feedback oil ports S are in communication with one ends of two fifth pipelines respectively, and the other ends of the two fifth pipelines are in communication with each other, and the communication part is in communication with the spring cavity oil port of the corresponding pressure compensator 6 through a sixth pipeline.

[0056] The two pressure compensators 6 are used to control the constant pressure difference before and after the reversing valve 4, to ensure the constant hydraulic oil flow through the reversing valve, and to ensure the stable rotation speed of the exhaust fan motor 1 and the centrifugal fan motor 2, and the structure is simple and reasonable.

[0057] According to the above scheme, the two load feedback oil ports S are in communication with the oil outlet A and the oil outlet B of the corresponding reversing valve 4.

[0058] It should be noted that each of the pressure compensators 6 (equivalent to a compensation valve) is a prior art, and its internal specific structure and principle will not be described here.

[0059] In addition, the pressure compensator 6 is provided with a valve core cavity, and a valve core is installed in the valve core cavity, and the communication and disconnection of each oil port are switched by the valve core.

[0060] Embodiment 3

[0061] In this embodiment, a shuttle valve one 12 is fixedly installed at the communication part between the other ends of the two fifth pipelines corresponding to the reversing valve corresponding to the exhaust fan motor 1, and two secondary overflow valves 8 are further included, and the interfaces one of the two secondary overflow valves 8 are in communication with the corresponding two fifth pipelines through pipelines, and the interfaces two are in communication with the oil return pipeline 11 through pipelines.

[0062] The secondary overflow valve 8 is used to ensure that the working pressure of the exhaust fan motor 1 does not exceed the set value, and at the same time, the pressure of the two load feedback oil ports S of the reversing valve 4, i.e. the pressure of the two oil ports of the exhaust fan motor 1, is detected through the shuttle valve one 12, and the corresponding pressure signal is sent to the corresponding pressure compensator 6, to ensure the constant hydraulic oil flow through the reversing valve 4, and to ensure the stable rotation speed of the exhaust fan motor 1 and the centrifugal fan motor 2, and the structure is simple and reasonable.

[0063] According to the above scheme, a throttle valve 18 is fixedly installed on each of the fifth pipelines.

[0064] Embodiment 4

[0065] Based on any one of Embodiments 2 to 3, this embodiment further includes a main relief valve 3, which is fixedly installed on the return oil pipeline 11.

[0066] When the impurity removal system is working, the oil delivered by the hydraulic pump 5 is supplied to the two motors through the two reversing valves 4 respectively, and the excess oil is directly returned through the main relief valve 3 to avoid excessive system pressure and ensure safe operation.

[0067] When the impurity removal system is not working, the overflow pressure of the main relief valve 3 is only the spring pressure, thus ensuring that when the impurity removal system is not working, the hydraulic oil output by the hydraulic pump 5 can overflow back to the hydraulic oil tank 17 at low pressure through the main relief valve 3, reducing system power loss.

[0068] Example 5

[0069] Based on embodiment 4, this embodiment also includes two shuttle valves 2 13. The interface 1 of the two shuttle valves 2 13 is connected to the two pipelines 6 through pipelines respectively. The interface 2 of the two shuttle valves 2 13 is connected to each other, and the interface 3 of the shuttle valve 2 13 corresponding to the exhaust fan motor 1 is connected to one end of the load pipeline 14.

[0070] In this scheme, the pressure of the two load feedback ports S of the two directional valves 4 is detected by two shuttle valves 13, and the higher pressure signal of the two pressures is transmitted to the spring cavity port inside the valve core of the main relief valve 3 through the load pipeline 14, so as to dynamically control the relief pressure of the main relief valve and reduce power loss.

[0071] Example 6

[0072] Based on embodiment 7, in this embodiment, the main overflow valve 3 and the spring cavity oil port inside its valve core are connected to the load pipeline 14 through pipeline seven. It also includes an auxiliary overflow valve 15. The first interface of the auxiliary overflow valve 15 is connected to pipeline seven, and its second interface is connected to the return oil pipeline 11 at the part between the main overflow valve 3 and the two pipelines four and the return oil pipeline.

[0073] This solution uses an auxiliary relief valve 15 to limit the upper limit of the overflow pressure of the main relief valve 3 to not exceed the set value, ensuring the safety and reliability of the system.

[0074] Example 7

[0075] On the basis of embodiment 6, this embodiment further comprises two buffer oil supplement valve groups, each of which comprises two buffer valves 7, the interfaces one of the two buffer valves 7 are respectively communicated with the corresponding pipeline one and pipeline two through pipeline eight, the two pipeline eights are communicated through pipeline nine, and two unidirectional valves 16 with opposite flow directions are fixedly installed on the pipeline nine at intervals; the interfaces two of the two buffer valves 7 are communicated through pipeline ten, the pipeline ten is communicated with the oil return pipeline 11 through pipeline eleven; the interface three of the shuttle valve two 13 corresponding to the centrifugal fan motor 2 is communicated with the corresponding pipeline eleven through pipeline twelve, and the pipeline eleven is also communicated with the part between the two unidirectional valves 16 of the pipeline nine.

[0076] Each buffer valve 7 is matched with two unidirectional valves 16, so as to prevent system pressure impact and oil way air suction when the fan stops, prolong the service life of the fan, and reduce the cost.

[0077] Embodiment 8

[0078] On the basis of each of the above embodiments, this embodiment further comprises an oil tank 17, and the other end of the oil inlet pipeline 9 and the other end of the oil return pipeline 11 are respectively communicated with the oil tank 17.

[0079] The scheme supplies oil to the whole system through the oil tank 17, recovers oil after system operation, realizes recycling of the oil, saves resources, and reduces the cost.

[0080] Embodiment 9

[0081] On the basis of each of the above embodiments, this embodiment further provides a double-fan impurity removal device, which comprises the double-fan hydraulic system as described above.

[0082] The double-fan impurity removal device provided by this embodiment is compact in structure, reasonable in design, can realize effective control of the double-fan motor, and effectively reduces the impurity content and loss rate of sugarcane harvesting.

[0083] Embodiment 10

[0084] On the basis of each of the above embodiments, this embodiment further provides a sugarcane harvester, which comprises the double-fan impurity removal device as described above.

[0085] The double-fan impurity removal device provided by this embodiment is compact in structure, reasonable in design, can realize effective control of the double-fan motor, and effectively reduces the impurity content and loss rate of sugarcane harvesting.

[0086] The working principle of the present application is as follows:

[0087] When the impurity removal system works, the oil delivered by the hydraulic pump 5 is supplied to the two motors through the two reversing valves 4 respectively, and the excess oil is directly returned through the main overflow valve 3 to avoid excessive system pressure and safe operation;

[0088] When the impurity removal system does not work, the overflow pressure of the main overflow valve 3 is only the spring pressure, so that when the impurity removal system does not work, the hydraulic oil output by the hydraulic pump 5 can be returned to the hydraulic oil tank 17 through the main overflow valve 3 at low pressure, reducing the power loss of the system.

[0089] It should be noted that the letters in the drawings only represent the oil ports corresponding to the reversing valves or the oil paths corresponding to the motors, and have no other substantive meanings; moreover, the arrows in the drawings only represent the flow direction of the oil.

[0090] In addition, each electronic component involved in the present application adopts the prior art, and each component is electrically connected with the controller, and the control circuit between the controller and each component is the prior art.

[0091] It will be apparent to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims, not the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0092] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

[0093] The above is only the preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A dual-fan hydraulic system, characterized in that: It includes an exhaust fan motor (1), a centrifugal fan motor (2), a hydraulic pump (5) and two reversing valves (4). Each of the reversing valves (4) is provided with an oil inlet P, an oil outlet A, an oil outlet B, an oil return port T1 and an oil return port T2. The oil inlet P is connected to the oil outlet A and the oil outlet B is connected to the oil return port T2, or the oil inlet P is connected to the oil outlet B and the oil outlet A is connected to the oil return port T1. The oil port 1 of the exhaust fan motor (1) and the oil port 1 of the centrifugal fan motor (2) are respectively connected to the two oil outlets A through the first pipeline. The oil port 2 of the exhaust fan motor (1) and the oil port 2 of the centrifugal fan motor (2) are respectively connected to the two oil outlets B through the second pipeline. The inlet of the hydraulic pump (5) is connected to one end of the oil inlet pipeline (9), and its outlet is connected to one end of the oil supply pipeline (10). The other end of the oil supply pipeline (10) is connected to the two oil inlets P through pipeline three, and the other end of the oil supply pipeline (10) is also connected to one end of the return oil pipeline (11). The two return oil ports T1 and the two return oil ports T2 are connected to the return oil pipeline (11) through pipeline four. It also includes speed sensors for collecting and feeding back the speeds of the exhaust fan motor (1) and the centrifugal fan motor (2), respectively; It also includes two pressure compensators (6), which are fixedly installed on the two pipelines three respectively; each of the reversing valves (4) is also provided with two load feedback oil ports S respectively connected to the oil outlet A and the oil outlet B, the two load feedback oil ports S are respectively connected to one end of the two pipelines five, the other ends of the two pipelines five are connected to each other, and their connection is connected to the spring cavity oil port inside the valve core of the corresponding pressure compensator (6) through the pipeline six; A shuttle valve (12) is fixedly installed at the connection between the other ends of the two pipelines corresponding to the reversing valve (4) of the exhaust fan motor (1), and two secondary overflow valves (8) are also included. The interface one of the two secondary overflow valves (8) is connected to the two corresponding pipelines through pipelines, and the interface two on them is connected to the return oil pipeline (11) through pipelines.

2. The dual-fan hydraulic system according to claim 1, characterized in that: It also includes a main relief valve (3), which is fixedly installed on the return oil line (11).

3. The dual-fan hydraulic system according to claim 2, characterized in that: It also includes two shuttle valves (13), the interfaces of the two shuttle valves (13) are respectively connected to the two pipes (6) through pipes, the interfaces of the two shuttle valves (13) are connected to each other, and the interface of the shuttle valve (13) corresponding to the exhaust fan motor (1) is connected to one end of the load pipe (14).

4. The dual-fan hydraulic system according to claim 3, characterized in that: The main relief valve (3) is connected to the load pipeline (14) through the spring cavity oil port inside its valve core via pipeline seven. It also includes an auxiliary relief valve (15). The first interface of the auxiliary relief valve (15) is connected to pipeline seven, and its second interface is connected to the part of the return oil pipeline (11) corresponding to the connection between the main relief valve (3) and the two pipelines four and the return oil pipeline (11).

5. The dual-fan hydraulic system according to claim 4, characterized in that: It also includes two buffer oil replenishment valve groups, each of which includes two buffer valves (7). The interface 1 of the two buffer valves (7) is connected to the corresponding pipeline 1 and pipeline 2 through pipeline 8, respectively. The two pipelines 8 are connected to each other through pipeline 9. Two one-way valves (16) with opposite flow directions are fixedly installed on pipeline 9 at intervals. The interface 2 of the two buffer valves (7) is connected to each other through pipeline 10. Pipeline 10 is connected to the return oil pipeline (11) through pipeline 11. The interface 3 of the shuttle valve 2 (13) corresponding to the centrifugal fan motor (2) is connected to the corresponding pipeline 11 through pipeline 12. Pipeline 11 is also connected to the part between the two one-way valves (16) of pipeline 9.

6. The dual-fan hydraulic system according to any one of claims 1-5, characterized in that: It also includes an oil tank (17), and the other end of the oil inlet pipe (9) and the other end of the oil return pipe (11) are respectively connected to the oil tank (17).

7. A dual-fan impurity removal device, characterized in that: Includes the dual-fan hydraulic system as described in any one of claims 1-6.

8. A sugarcane harvester, characterized in that: Includes the dual-fan impurity removal device as described in claim 7.

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