A control valve, a reversing valve and a control system thereof

Abstract

The application discloses a control valve, a reversing valve and a control system comprising the reversing valve. The valve body of the control valve is provided with a first fluid passage, a second fluid passage and a third fluid passage, and is further provided with a first control switch, a second control switch and a third control switch. When one of the first fluid passage, the second fluid passage and the third fluid passage is in an on state, the other two are in an off state. When the first fluid passage is in the on state, the control valve is in a working state of supplying fluid working medium to an executing element. When the second fluid passage is in the on state, the control valve is in a working state of returning fluid working medium. When the third fluid passage is in the on state, the control valve is in a working state of supplementing fluid working medium to the executing element. The reversing valve composed of the control valve disclosed by the application can replace the traditional reversing valve, and can make two inlets and outlets of the executing element independently controllable. Meanwhile, the reversing valve has a brake function.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of fluid transmission technology, especially the field of hydraulic transmission technology, and particularly relates to a control valve, a reversing valve and a control system thereof. BACKGROUND

[0002] Fluid transmission technology is widely used in various industries. It is particularly widely used in the field of engineering machinery. Engineering machinery (such as loaders, excavators, cranes, concrete pump trucks, etc. with hydraulic systems) has the advantages of high work efficiency and strong work capacity and is widely used. It can be said that the emergence of engineering machinery makes the operation of building high-rise buildings, erecting high-speed rails, and installing some special equipment simpler, more efficient, more labor-saving, and cost-saving, and even can complete the work that was previously impossible. In the process of modernization, engineering machinery plays a vital role. Although the existing engineering machinery can meet the requirements of most engineering, most of the existing engineering machinery needs to be operated by the operator on site to implement the relevant work. In some special working conditions and high-risk application scenarios, it may even pose a great threat to the life of the operator. Even if individual hydraulic systems can be remotely operated by artificial means through sensing technology, due to the nonlinear relationship between flow and pressure at the throttle, it is difficult to establish a linear correspondence between the flow or pressure and the modern electric control pulse signal, thereby making it difficult to achieve intelligent control through the control program of the chip. At most, it can achieve remote analog control by a specific person. Taking excavators as an example, hydraulic control excavators are indispensable mechanical equipment in various earthwork construction, especially in special working conditions such as earthquake relief, toxic environment, dangerous tunnel, fire fighting and rescue, cliff opening, and explosion site cleaning. It poses a great danger to the operator. If the remote and intelligent control operation of engineering machinery can be realized, the engineering machinery will not only liberate labor and improve work safety, but also greatly improve the work capacity of the engineering machinery and reduce the cost of use and maintenance. However, to realize the intelligent control of equipment containing a hydraulic control system, it is necessary to first realize the discretization and digitization of the hydraulic system. The existing hydraulic control system is limited by the structure, function defects of the constituent elements and the combination defects between the components, which makes the various functions of the hydraulic control system coupled and restricted with each other, making it difficult to realize the discretization and digitization of the hydraulic medium. Under the existing technical strength, the intelligent control of the hydraulic control system is only a fitting algorithm that is constantly adjusted, and it is not easy to realize quantitative control. Therefore, it is necessary to rethink and redesign the various constituent elements and the combination between the elements contained in the existing hydraulic control system.

[0003] The existing reversing valve all comprises a valve body and a valve core matched with the valve body, and the number of working positions of the valve core staying in the valve body is two, three or the like, and the number of oil passages connected with the valve body is two, three, four and six or the like. However, no matter what kind of reversing valve is, the two working substance inlets and outlets of the executing element are mostly simultaneously associated and coupled, and the executing element cannot be in the on state at one working substance inlet and outlet, and the other working substance inlet and outlet can be in any state including the off state, the on state and the state between the two states, which can be flexibly selected. Therefore, the existing reversing valve only has the linkage reversing function, and does not have the advantage of independent controllability of the two load ports of the executing element. In some working conditions, due to the existence of liquid power, when the executing element is braked, the hydraulic impact damage of the hydraulic system pipeline or element is often caused. In addition, the existing independent oil port control valve still adopts the spool valve structure, and the reversing valve often has the phenomenon of hydraulic clamping, the reversing dead zone is large, and the requirement for the cleanliness of oil is high, which is one of the important reasons affecting the application of the reversing valve in the control system.

[0004] In order to adapt to the high pressure, discretization, digitization and intelligent control of the hydraulic control system, a new type of discretization and digitization control system needs to be combined to innovatively conceive and design the existing reversing valve, so as to overcome the problems of the existing reversing valve, such as large reversing dead zone, many coupling factors in control and lack of flexible adaptation to the variable working conditions of the executing element. Therefore, the applicant proposes a reversing valve capable of independently controlling the two inlets and outlets of the executing element and having a brake function.

[0005] It should be noted that the above content belongs to the technical cognition range of the inventor, and does not necessarily constitute the prior art. SUMMARY

[0006] The present application provides a control valve, a reversing valve and a control system thereof, so as to solve at least one of the above technical problems.

[0007] The technical scheme adopted by the present application is as follows:

[0008] A control valve comprises a valve body, a first fluid passage, a second fluid passage and a third fluid passage are arranged on the valve body, a first control switch for controlling the on-off of the first fluid passage, a second control switch for controlling the on-off of the second fluid passage and a third control switch for controlling the on-off of the third fluid passage are further arranged on the valve body; when one of the first fluid passage, the second fluid passage and the third fluid passage is in the on state, the other two are in the off state.

[0009] When the first fluid passage is in the on state, the control valve is in the working state of supplying fluid working substance to the executing element.

[0010] When the second fluid passage is in the on state, the control valve is in the working state of fluid working medium backflow;

[0011] When the third fluid passage is in the on state, the control valve is in the working state of supplementing fluid working medium to the actuating element.

[0012] Further selectively, the control valve further comprises a driving unit, the first control switch is provided with a first rotating body with a flow channel, the second control switch is provided with a second rotating body with a flow channel, and the third control switch is provided with a third rotating body with a flow channel; the first rotating body, the second rotating body and the third rotating body are respectively driven by the driving unit.

[0013] Further selectively, the first rotating body, the second rotating body and the third rotating body are provided as valve cores arranged coaxially, the valve body is provided with a valve core cavity matched with the valve cores, the valve cores are arranged in the valve core cavity, the driving unit is provided as a driving motor, the valve cores are in transmission connection with the driving motor, and the on state or off state of the first fluid passage, the second fluid passage and the third fluid passage is controlled in the rotating process of the valve cores.

[0014] Further selectively, the flow channel on the first rotating body is provided as a first through hole penetrating the side wall of the valve core, the flow channel on the second rotating body is provided as a second through hole penetrating the side wall of the valve core, and the flow channel on the third rotating body is provided as a third through hole penetrating the side wall of the valve core; and further, the included angle of the axis of the first through hole, the axis of the second through hole and the axis of the third through hole projected on one end of the valve core is in the range of 55° to 65°.

[0015] Further selectively, a fourth control switch is arranged on the second fluid passage at the downstream side of the second control switch, when the control valve is in the working state of fluid working medium backflow, the fourth control switch is in the open state;

[0016] A fifth control switch is arranged on the third fluid passage at the upstream side of the third control switch, when the control valve is in the working state of supplementing fluid working medium to the actuating element, the fifth control switch is in the open state.

[0017] Further selectively, the third fluid passage at the upstream side of the fifth control switch is communicated with the first fluid passage at the upstream side of the first control switch through a sixth control switch, when the control valve is in the working state of supplying fluid working medium to the actuating element and needs to supplement oil to the actuating element, the sixth control switch is in the open state.

[0018] Further selectively, the valve body is provided with an actuator working medium pipeline interface end, the first fluid passage downstream of the first control switch, the second fluid passage upstream of the second control switch and the third fluid passage downstream of the third control switch are respectively communicated with the actuator working medium pipeline interface end.

[0019] A reversing valve, comprising a first control valve and a second control valve, the first control valve and the second control valve are provided as the control valve in any of the preceding solutions;

[0020] The first control valve controls one of the load ports of the actuator, and the second control valve controls the other load port of the actuator;

[0021] The load port of the actuator comprises a first working medium inlet and outlet port and a second working medium inlet and outlet port;

[0022] Further selectively, the valve body is provided with a working medium inflow passage, the working medium inflow passage is communicated with the working medium inlet end of the first fluid passage of the first control valve and the working medium inlet end of the first fluid passage of the second control valve through a seventh control switch, and the seventh control switch is in an open state when the fluid working medium is provided to the actuator.

[0023] Further selectively, the reversing valve comprises an electronic control unit, the drive unit included in the first control valve is controlled by the electronic control unit, and the drive unit included in the first control valve controls the on-off of the first fluid passage, the second fluid passage and the third fluid passage of the first control valve according to the set rotation direction and rotation angle; the drive unit included in the second control valve is controlled by the electronic control unit, and the drive unit included in the second control valve controls the on-off of the first fluid passage, the second fluid passage and the third fluid passage of the second control valve according to the set rotation direction and rotation angle.

[0024] A control system applying the reversing valve in any of the preceding solutions, the control system comprises a fluid working medium source, a pumping unit and an actuator, the actuator comprises a first working medium inlet and outlet port and a second working medium inlet and outlet port;

[0025] The fluid working medium source is communicated with the working medium inlet end of the first fluid passage of the first control valve through the pumping unit, and the working medium outlet end of the first fluid passage of the first control valve is communicated with the first working medium inlet and outlet port;

[0026] The working medium inlet end of the second fluid passage of the first control valve is communicated with the first working medium inlet and outlet port, and the working medium outlet end of the second fluid passage of the first control valve is communicated with the fluid working medium source;

[0027] The working medium inlet end of the third fluid channel of the first control valve is connected to the working medium source, and the working medium outlet end of the third fluid channel of the first control valve is connected to the first working medium inlet and outlet port;

[0028] The fluid working medium source is connected to the working medium inlet end of the first fluid channel of the second control valve through the pumping unit, and the working medium outlet end of the first fluid channel of the second control valve is connected to the second working medium inlet and outlet port;

[0029] The working medium inlet end of the second fluid channel of the second control valve is connected to the second working medium inlet and outlet port, and the working medium outlet end of the second fluid channel of the second control valve is connected to a fluid working medium source;

[0030] The working medium inlet end of the third fluid channel of the second control valve is communicated with a fluid working medium source, and the working medium outlet end of the third fluid channel of the second control valve is communicated with the second working medium inlet and outlet port.

[0031] In this application, those skilled in the art are motivated to set necessary components, units or systems at necessary places according to the known technologies in the relevant fields.

[0032] In this application, the so-called control system refers to a system that uses a fluid medium as a working medium and can implement control, such as a hydraulic control system, a pneumatic control system, etc.

[0033] In the present application, the fluid medium is not specifically limited and can be a liquid medium or a gaseous medium. In a specific implementation, the liquid medium is preferably set to hydraulic oil.

[0034] In the present application, the so-called “downstream side of A” refers to the flow direction of the fluid working medium as a reference, that is, the fluid working medium first flows through A and then flows through the downstream position of A.

[0035] The so-called "upstream side of A" refers to the flow direction of the fluid, that is, the fluid first flows through the upstream position of A and then flows through A.

[0036] The control valve, reversing valve and control system proposed in this application can bring the following beneficial effects:

[0037] 1. In the present application, the control valve includes three fluid channels, and each fluid channel is controlled by a control switch. The two control valves are used to control the flow of the fluid medium of the same actuator respectively. Moreover, while realizing the function of the reversing valve, the two control valves can not only independently control the load port of the actuator, but also more flexibly select multiple oil circuits to adapt to the variable load conditions.

[0038] 2. The reversing valve formed by two independent control valves has independent control over the working medium supply channel and the working medium return channel, so that the brake function is realized under certain working conditions, for example, when the large arm of the excavator moves from the high position to the low position, the large arm has a tendency to move to the low position under the action of gravity. By controlling the rapid opening and closing of the control valve arranged on the return channel, the throttling loss is reduced, and the large hydraulic impact is avoided, so that the large arm can move smoothly and controllably from the high position to the low position, and the function of the point brake is realized without affecting the normal operation of the system. BRIEF DESCRIPTION OF DRAWINGS

[0039] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0040] Figure 1 A schematic diagram of a control valve provided by an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the structure of a control valve provided by an embodiment of the present application;

[0042] Figure 3 A schematic diagram of the axis of the first through hole, the axis of the second through hole and the axis of the third through hole on one end of the valve core;

[0043] Figure 4 A schematic diagram of a reversing valve provided by an embodiment of the present application.

[0044] Among them,

[0045] 1 valve body, 11 first fluid channel, 12 second fluid channel, 13 third fluid channel, 14 valve core,

[0046] 2 first control switch, 21 first rotating body, 211 first through hole,

[0047] 3 second control switch, 31 second rotating body, 311 second through hole,

[0048] 4 third control switch, 41 third rotating body, 411 third through hole,

[0049] 5 fourth control switch,

[0050] 6 fifth control switch,

[0051] 7 sixth control switch,

[0052] 8 seventh control switch,

[0053] 9 drive unit,

[0054] 10 execution element working medium pipeline interface end,

[0055] 20 first control valve,

[0056] 30 second control valve. DETAILED DESCRIPTION

[0057] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail with reference to the accompanying drawings.

[0058] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0059] In addition, the terms "first", "second" are only for descriptive purposes 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" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0060] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between 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.

[0061] In the present application, unless specifically stated and limited otherwise, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact with an intermediate medium. In the description of the specification, the description of the terms "one scheme", "some schemes", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the scheme or example are included in at least one scheme or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more schemes or examples.

[0062] For the convenience of description, "front", "back", "left", "right", "up", "down" in the following are relative to the orientation of the control valve when used by a user.

[0063] In the present application, the fluid working medium is not specifically limited, which can be a liquid working medium or a gas working medium. In specific implementation, the liquid working medium is preferably set as hydraulic oil.

[0064] In the present application, a value above includes the value, for example, two or more includes two.

[0065] As Figure 1 and Figure 2The control valve comprises a valve body 1, a first fluid passage 11, a second fluid passage 12 and a third fluid passage 13 are arranged on the valve body 1, a first control switch 2 for controlling the on-off of the first fluid passage 11, a second control switch 3 for controlling the on-off of the second fluid passage 12 and a third control switch 4 for controlling the on-off of the third fluid passage 13 are arranged on the valve body 1; in operation, one of the first fluid passage 11, the second fluid passage 12 and the third fluid passage 13 is in the on state while the other two are in the off state; when the first fluid passage 11 is in the on state, the control valve is in the working state of supplying fluid working medium to the actuator; when the second fluid passage 12 is in the on state, the control valve is in the working state of fluid working medium backflow; when the third fluid passage 13 is in the on state, the control valve is in the working state of supplementing fluid working medium to the actuator. In specific implementation, the first control switch 2, the second control switch 3 and the third control switch 4 can be selectively and independently arranged, and the first control switch 2, the second control switch 3 and the third control switch 4 are driven by a driving unit 9 respectively; as an alternative implementation, at least two of the first control switch 2, the second control switch 3 and the third control switch 4 can be selectively and associatedly arranged and driven by the driving unit 9; preferably, the first control switch 2, the second control switch 3 and the third control switch 4 are all associatedly arranged and the opening and closing of the first control switch 2, the second control switch 3 and the third control switch 4 are driven by the same driving unit 9. In specific implementation, the driving unit 9 can be further selectively arranged as a driving motor, and the driving motor can be further preferably arranged as a servo motor or a stepping motor. In specific operation, the first fluid passage 11, the second fluid passage 12 and the third fluid passage 13 can be simultaneously in the off state under the action of the first control switch 2, the second control switch 3 and the third control switch 4. The control valve comprises three fluid passages, each fluid passage is controlled by a control switch, the flow of fluid medium of the same actuator is controlled by two control valves respectively, and the two control valves can be independently controlled while realizing the function of the reversing valve.

[0066] As a preferred embodiment of the present application, all the aforementioned embodiments of the present application and their alternative embodiments can further selectively provide that the first control switch 2 is provided as a first rotating body 21 with a flow channel, the second control switch 3 is provided as a second rotating body 31 with a flow channel, and the third control switch 4 is provided as a third rotating body 41 with a flow channel; the first rotating body 21, the second rotating body 31 and the third rotating body 41 are respectively driven by the driving unit 9. In a specific implementation, a rotating body mounting position adapted to the first rotating body 21, the second rotating body 31 and the third rotating body 41 can be further selectively provided on the valve body 1, the first rotating body 21, the second rotating body 31 and the third rotating body 41 are respectively adapted to the rotating body mounting position, and the first fluid passage 11, the second fluid passage 12 and the third fluid passage 13 are required to be in an on or off state during the rotation of the first rotating body 21, the second rotating body 31 and the third rotating body 41.

[0067] As a preferred embodiment of the present application, all the aforementioned embodiments of the present application and their alternative embodiments can further selectively provide that the first rotating body 21, the second rotating body 31 and the third rotating body 41 are provided as a valve core 14 arranged coaxially, the valve body 1 is provided with a valve core accommodating cavity adapted to the valve core 14, the valve core 14 is arranged in the valve core accommodating cavity, the driving unit 9 is provided as a driving motor, the valve core 14 is in transmission connection with the driving motor, and the on or off state of the first fluid passage 11, the second fluid passage 12 and the third fluid passage 13 is controlled during the rotation of the valve core 14. In a specific implementation, the flow channel on the first rotating body 21 is further selectively provided as a first through hole 211 penetrating the side wall of the valve core, the flow channel on the second rotating body 31 is further selectively provided as a second through hole 311 penetrating the side wall of the valve core, and the flow channel on the third rotating body 41 is further selectively provided as a third through hole 411 penetrating the side wall of the valve core; the angle between the axis of the first through hole 211, the axis of the second through hole 311 and the axis of the third through hole 411 projected at one end of the valve core 14 is in the range of 55° to 65°; as shown in the figure, and the angle between the axis of the first through hole 211, the axis of the second through hole 311 and the axis of the third through hole 411 projected at one end of the valve core 14 is further preferably 60°. In a specific implementation, in order to provide a large enough torque for the driving unit 9, the driving motor with a larger driving power or the driving motor with a suitable speed reducer can be further selectively used to drive the valve core 14 to rotate. Figure 3

[0068] As a preferred embodiment of the present application,​Figure 2 As shown in the drawings, the control valve can be further selectively provided with a fourth control switch 5 on the second fluid passage 12 downstream of the second control switch 3, and the fourth control switch 5 is in an open state when the control valve is in a working state of fluid working medium backflow; and a fifth control switch 6 on the third fluid passage 13 upstream of the third control switch 4, and the fifth control switch 6 is in an open state when the control valve is in a working state of supplementing fluid working medium to the actuator. In specific implementation, the fourth control switch 5 is further selectively provided as a controlled switch or as a one-way valve, and the fourth control switch 5 is in an open state when the second fluid passage 12 is in a connected state. In specific implementation, the fifth control switch 6 can be further selectively provided as a controlled switch or as a one-way valve, and the fifth control switch 6 is in an open state when the third fluid passage 13 is in a connected state.

[0069] As a preferred embodiment of the present embodiment, all embodiments of the present application containing the fifth control switch 6 can further selectively connect the third fluid passage 13 upstream of the fifth control switch 6 to the first fluid passage 11 upstream of the first control switch 2 through a sixth control switch 7, and the sixth control switch 7 is in an open state when the control valve is in a working state of supplying fluid working medium to the actuator and needs to supplement oil to the actuator; for example, when the actuator is driven by a load in the process of supplying fluid working medium to the actuator, the sixth control switch 7 is in an open state to supplement fluid working medium to the actuator. In specific implementation, the sixth control switch 7 can be further selectively provided as a controlled switch or as a one-way valve.

[0070] As a preferred embodiment of the present application, as shown in the drawings, Figure 2 As shown in the drawings, all the foregoing embodiments of the present application can further selectively provide the valve body 1 with an actuator working medium pipeline interface end 10, and the first fluid passage 11 downstream of the first control switch 2, the second fluid passage 12 upstream of the second control switch 3, and the third fluid passage 13 downstream of the third control switch 4 are respectively connected to the actuator working medium pipeline interface end 10. In specific implementation, the actuator working medium pipeline interface end 10 is connected to one working medium inlet and outlet port of the actuator through a fluid pipeline.

[0071] The present application also discloses a reversing valve, as shown in the drawings, Figure 4As shown, the reversing valve comprises a first control valve 20 and a second control valve 30, which are any one of the control valves in the aforementioned all embodiments, examples and their convertible embodiments, examples; the first control valve 20 controls one of the load ports of the actuator, and the second control valve 30 controls the other load port of the actuator; the load ports of the actuator include a first working medium inlet and outlet port and a second working medium inlet and outlet port;

[0072] When the first fluid passage 11 of the first control valve 20 is in the on state, the first fluid passage 11 of the second control valve 30 is in the off state and its second fluid passage 12 is in the on state; when the second fluid passage 12 of the first control valve 20 is in the on state, the second fluid passage 12 of the second control valve 30 is in the off state and its first fluid passage 11 is in the on state; when the first fluid passage 11 of the second control valve 30 is in the on state, the first fluid passage 11 of the first control valve 20 is in the off state and its second fluid passage 12 is in the on state; when the second fluid passage 12 of the second control valve 30 is in the on state, the second fluid passage 12 of the first control valve 20 is in the off state and its first fluid passage 11 is in the on state.

[0073] As a preferred embodiment of the present application, the aforementioned reversing valve can further selectively provide a working medium inflow passage on the valve body 1 in specific implementation, which is communicated with the working medium inlet end of the first fluid passage 11 of the first control valve 20 and the working medium inlet end of the first fluid passage 11 of the second control valve 30 through the seventh control switch 8, and the seventh control switch 8 is in the open state when the fluid working medium is provided to the actuator. In specific implementation, the seventh control switch 8 can be selectively referred to as being on the valve body or being provided outside the valve body.

[0074] As a convertible embodiment, the valve body 1 of the first control valve 20 and the second control valve 30 included in the reversing valve of the present application can be integrally provided or separately provided.

[0075] As a preferred embodiment of the present application, all the aforementioned reversing valves of the present application can further selectively comprise an electric control unit, the drive unit 9 comprised by the first control valve 20 is controlled by the electric control unit, the drive unit 9 comprised by the first control valve 20 controls the on-off of the first fluid passage 11, the second fluid passage 12 and the third fluid passage 13 of the first control valve 20 according to the set rotation direction and rotation angle respectively; and further selectively, the drive unit 9 comprised by the second control valve 30 is controlled by the electric control unit, the drive unit 9 comprised by the second control valve 30 controls the on-off of the first fluid passage 11, the second fluid passage 12 and the third fluid passage 13 of the second control valve 30 according to the set rotation direction and rotation angle respectively. Since the reversing valve of the present application is formed by two independent control valves, it has the characteristics of independent control of the working medium supply passage and the working medium return passage, so that the reversing valve can meet more functions; for example, in some working conditions, the brake function is realized, for example, when the large arm of the excavator moves from the high position to the low position, under the action of gravity, the large arm has the tendency to move to the low position, by controlling the opening and closing of the control valve arranged on the return passage, the large arm can stably and controllably move from the high position to the low position, without affecting the normal operation of the system, realizing the function of brake. In addition, the two control valves comprised by the reversing valve are respectively driven by different drive units, when the drive unit is set as a drive motor or a drive unit comprising a drive motor, the drive motor is controlled by the control unit, thereby realizing precise control of each control valve, and providing a technical basis for the intelligentization of the control system.

[0076] The present application also discloses a control system applying the reversing valve, now combining Figure 4 The control system is described as follows, the control system comprises a fluid working medium source, a pumping unit and an execution element, the execution element comprises a first working medium inlet and outlet port and a second working medium inlet and outlet port; the fluid working medium source is communicated with the working medium inlet end of the first fluid passage 11 of the first control valve 20 through the pumping unit, the working medium outlet end of the first fluid passage 11 of the first control valve 20 is communicated with the first working medium inlet and outlet port through the A port in the Figure 4 The working medium inlet end of the second fluid passage 12 of the first control valve 20 is communicated with the first working medium inlet and outlet port through the A port in the Figure 4 The working medium outlet end of the second fluid passage 12 of the first control valve 20 is communicated with the fluid working medium source; the working medium inlet end of the third fluid passage 13 of the first control valve 20 is communicated with the fluid working medium source through the T1 port in the Figure 4 The working medium outlet end of the third fluid passage 13 of the first control valve 20 is communicated with the first working medium inlet and outlet port through the A port in the Figure 4 The working medium inlet end of the second fluid passage 12 of the first control valve 20 is communicated with the first working medium inlet and outlet port through the A port in the

[0077] The fluid working medium source is communicated with the working medium inlet end of the first fluid passage 11 of the second control valve 30 through the pumping unit, the working medium outlet end of the first fluid passage 11 of the second control valve 30 is communicated with the second working medium inlet and outlet port through the B port in the T1 port, the working medium inlet end of the second fluid passage 12 of the second control valve 30 is communicated with the second working medium inlet and outlet port through the B port in the T2 port, the working medium outlet end of the second fluid passage 12 of the second control valve 30 is communicated with the fluid working medium source, the working medium inlet end of the third fluid passage 13 of the second control valve 30 is communicated with the fluid working medium source through the T2 port in the T1 port, and the working medium outlet end of the third fluid passage 13 of the second control valve 30 is communicated with the second working medium inlet and outlet port through the B port in the T2 port. Figure 4 Figure 4 Figure 4 Figure 4 The inlet end of the first fluid passage 11 of the first control valve 20 and the inlet end of the first fluid passage 11 of the second control valve 30 are communicated, and the seventh control switch 8 is arranged upstream of the communicated position, and the inlet end P of the seventh control switch 8 is communicated with the fluid working medium source, the inlet end of the second fluid passage 12 of the first control valve 20 and the inlet end of the second fluid passage 12 of the second control valve 30 are communicated and merged, and then communicated with the working medium source through the P' in the T1 port, as an alternative embodiment, the inlet end of the first fluid passage 11 of the first control valve 20 and the inlet end of the first fluid passage 11 of the second control valve 30 can be independently arranged, and / or the inlet end of the second fluid passage 12 of the first control valve 20 and the inlet end of the second fluid passage 12 of the second control valve 30 can be independently arranged. Figure 4

[0078] In the implementation of the foregoing control system, the fluid working medium source can be selected to be one, two, three or more than four, and can be arranged according to actual needs.

[0079] In the implementation of the foregoing control system, the actuator can be selected to be a pneumatic actuator or a hydraulic actuator, for example, a fluid motor, a pneumatic cylinder or a hydraulic cylinder.

[0080] The drawings of the foregoing control system are only schematic, and any technical solution meeting the description of the foregoing control system is within the protection scope of the foregoing control system.

[0081] Each embodiment in the foregoing description is described in a progressive manner, and the same or similar parts of each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments. In particular, the system embodiment is basically similar to the method embodiment, and the description is relatively simple, and the related parts can be referred to the part of the method embodiment.​​​​

[0082] The above descriptions are only some embodiments of the present application and are not intended to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A control system for a reversing valve, characterized in that, The control valve comprises a valve body provided with a first fluid passage, a second fluid passage and a third fluid passage, and a first control switch, a second control switch and a third control switch are arranged on the valve body; one of the first fluid passage, the second fluid passage and the third fluid passage is in an open state, and the other two are in a closed state; The control system further comprises a fluid source, a pumping unit and an actuator; When the first fluid passage is in the open state, the control valve is in a working state of supplying the fluid to the actuator; when the second fluid passage is in the open state, the control valve is in a working state of returning the fluid; when the third fluid passage is in the open state, the control valve is in a working state of supplementing the fluid to the actuator; The control system further comprises a reversing valve, and the reversing valve comprises two control valves, i.e. a first control valve and a second control valve; the first control valve controls one of load ports of the actuator, and the second control valve controls the other load port of the actuator; the load ports of the actuator comprise a first fluid inlet and outlet port and a second fluid inlet and outlet port; The fluid source is communicated with a fluid inlet end of a first fluid passage of the first control valve through the pumping unit, and a fluid outlet end of the first fluid passage of the first control valve is communicated with the first fluid inlet and outlet port; A fluid inlet end of a second fluid passage of the first control valve is communicated with the first fluid inlet and outlet port, and a fluid outlet end of the second fluid passage of the first control valve is communicated with the fluid source; A fluid inlet end of a third fluid passage of the first control valve is communicated with the fluid source, and a fluid outlet end of the third fluid passage of the first control valve is communicated with the first fluid inlet and outlet port; The fluid source is communicated with a fluid inlet end of a first fluid passage of the second control valve through the pumping unit, and a fluid outlet end of the first fluid passage of the second control valve is communicated with the second fluid inlet and outlet port; A fluid inlet end of a second fluid passage of the second control valve is communicated with the second fluid inlet and outlet port, and a fluid outlet end of the second fluid passage of the second control valve is communicated with the fluid source; A fluid inlet end of a third fluid passage of the second control valve is communicated with the fluid source, and a fluid outlet end of the third fluid passage of the second control valve is communicated with the second fluid inlet and outlet port; The control valve further comprises a driving unit, the first control switch is a first rotating body provided with a flow channel, the second control switch is a second rotating body provided with a flow channel, and the third control switch is a third rotating body provided with a flow channel; The first rotating body, the second rotating body and the third rotating body are respectively driven by the driving unit.

2. The control system of the reversing valve according to claim 1, wherein The first rotating body, the second rotating body and the third rotating body are coaxially arranged valve spools, the valve body is provided with a valve spool cavity matched with the valve spools, the valve spools are arranged in the valve spool cavity, and the driving unit is a driving motor.

3. The control system of the reversing valve according to claim 2, wherein the first rotating body is provided with a first through hole penetrating the side wall of the valve spool, the second rotating body is provided with a second through hole penetrating the side wall of the valve spool, and the third rotating body is provided with a third through hole penetrating the side wall of the valve spool. The first through hole, the second through hole and the third through hole are arranged on the valve spool, and the axes of the first through hole, the second through hole and the third through hole are arranged at an angle of 55° to 65°.

4. The control system of the reversing valve according to claim 1, wherein a fourth control switch is arranged on the second fluid passage downstream of the second control switch, and the fourth control switch is in an open state when the control valve is in a working state of returning fluid working medium. A fifth control switch is arranged on the third fluid passage upstream of the third control switch, and the fifth control switch is in an open state when the control valve is in a working state of supplying fluid working medium to the actuator.

5. The control system of the reversing valve according to claim 4, wherein the third fluid passage upstream of the fifth control switch is connected to the first fluid passage upstream of the first control switch through a sixth control switch, and the sixth control switch is in an open state when the control valve is in a working state of supplying fluid working medium to the actuator and needs to supply oil to the actuator.

6. The control system of the reversing valve according to any one of claims 1 to 5, wherein the valve body is further provided with an actuator working medium pipeline interface end, and the first fluid passage downstream of the first control switch, the second fluid passage upstream of the second control switch and the third fluid passage downstream of the third control switch are respectively connected to the actuator working medium pipeline interface end.

7. The control system of the reversing valve according to claim 1, wherein the reversing valve comprises an electronic control unit, the driving unit of the first control valve is controlled by the electronic control unit, and the driving unit of the first control valve controls the on-off of the first fluid passage, the second fluid passage and the third fluid passage of the first control valve according to a set rotating direction and a set rotating angle. The driving unit of the second control valve is controlled by the electronic control unit, and the driving unit of the second control valve controls the on-off of the first fluid passage, the second fluid passage and the third fluid passage of the second control valve according to a set rotating direction and a set rotating angle. ​ ​ ​ ​ ​

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