Control valve, hydraulic system, work machine and hydraulic control method

Abstract

Provided in the present application are a control valve, a hydraulic system, a work machine and a hydraulic control method. The control valve comprises: a valve body, which has a valve cavity inside, and is circumferentially provided with a fluid inlet hole and a fluid outlet hole arranged in a staggered manner; and a valve element, which is slidably arranged inside the valve cavity, wherein the outer wall surface of the valve element fits against the inner wall surface of the valve body; the valve element is provided with a fluid channel for communicating the fluid inlet hole with the fluid outlet hole; and when the valve element moves to one side, one of the fluid inlet hole and the fluid outlet hole remains in communication with the fluid channel, and the other is gradually staggered from the fluid channel. When faced with different load requirements, the opening states of the fluid inlet hole and the fluid outlet hole are changed by means of controlling the back-and-forth movement of the valve element, so as to achieve proportional control over the flow rate of a fluid, thereby ultimately realizing adjustment and control of the pressure and flow rate of the fluid.

Description

Control valve, hydraulic system, working machine and hydraulic control method

[0001] The present application claims priority to the Chinese patent application No. 202411061733.6 filed on August 5, 2024, and entitled "Control valve, hydraulic system, working machine and hydraulic control method", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of safety valve, more particularly, to a control valve, a hydraulic system, a working machine and a hydraulic control method. BACKGROUND

[0003] The unloading valve is one of the key components of the pump station system, and its main function is to stabilize the pump working pressure within a specified pressure range.

[0004] In the related art, a cone valve is usually used to realize the loading and unloading functions of the system. However, this scheme relies on a single on-off valve operating mode in actual application, and it is not satisfactory when dealing with variable load and flow requirements. The system cannot dynamically adjust the opening degree of the valve according to the real-time working condition, so it is difficult to accurately match the pressure control requirements under different load and flow conditions, lacks flexibility, and cannot effectively adapt to the control requirements of different loads and flows. TECHNICAL SOLUTION

[0005] The present application aims to at least solve one of the technical problems in the related art.

[0006] To this end, a first aspect of the present application is to provide a control valve.

[0007] A second aspect of the present application is to provide a hydraulic system.

[0008] A third aspect of the present application is to provide a working machine.

[0009] A fourth aspect of the present application is to provide a hydraulic control method.

[0010] A fifth aspect of the present application is to provide a hydraulic control device.

[0011] A sixth aspect of the present application is to provide another working machine.

[0012] A seventh aspect of the present application is to provide a computer-readable storage medium.

[0013] An eighth aspect of the present application is to provide a computer program product.

[0014] Therefore, according to a first aspect of the present application, a control valve is provided, comprising: a valve body, an inner portion of the valve body having a valve cavity, the valve body being provided with fluid inlet holes and fluid outlet holes arranged in a staggered manner in a circumferential direction; a valve core being slidably arranged in the valve cavity, an outer wall surface of the valve core being in abutment with an inner wall surface of the valve body; the valve core being provided with a fluid passage for connecting the fluid inlet holes and the fluid outlet holes; when the valve core moves to one side, one of the fluid inlet holes and the fluid outlet holes is kept in communication with the fluid passage, and the other is gradually staggered and closed from the fluid passage.

[0015] In the above technical solution, when the valve core moves to one side, one of the fluid inlet holes and the fluid outlet holes is kept in communication with the fluid passage, and the other is gradually staggered and closed from the fluid passage. In this way, when facing different load requirements, the opening state of the fluid inlet holes and the fluid outlet holes is changed by controlling the back-and-forth movement of the valve core, that is, the flow area from the fluid inlet holes to the fluid outlet holes is adjusted; the different opening states of the fluid inlet holes and the fluid outlet holes of the control valve result in different flow rates of the fluid, forming proportional control of the flow rate of the fluid, and finally realizing adjustment and control of the pressure and flow rate of the fluid. Thus, the adaptability of the control valve to multiple loads can be improved.

[0016] In some technical solutions, an annular groove is arranged on the outer wall surface of the valve core to form the fluid passage; the annular groove is provided with a first throttling edge and a second throttling edge on both sides of the moving direction.

[0017] Specifically, the first throttling edge and the second throttling edge have different shapes and structures. In this way, two flow area curves can be formed, so that multiple load requirements can be met, and the adaptability of the control valve to the control requirements of system flow rate and pressure can be further improved.

[0018] In the above technical solution, the first throttling edge is designed as an arc shape, and / or the second throttling edge is designed as a wave shape.

[0019] The arc-shaped design helps the fluid to achieve a smoother transition when passing through the throttling edge, reducing fluid impact and vortex formation, thereby reducing energy loss and noise; at the same time, due to the relatively simple and continuous geometric characteristics of the arc shape, the corresponding flow area change curve is also more predictable, facilitating accurate control of flow and pressure. The wavy design provides more flow path changes, so that the fluid can experience multiple different cross-section contractions and expansions when passing through, thereby achieving more flexible flow and pressure regulation. Therefore, in the above technical solution, the first throttling edge is designed as an arc shape, and the second throttling edge is designed as a wavy shape, combining the advantages of both, two completely different flow area curves can be formed. This means that during the adjustment process of the control valve, the two throttling modes can be flexibly selected or switched by adjusting the position of the valve core according to the actual load demand, thereby achieving optimal control of system flow and pressure. This design not only improves the flexibility and adaptability of the control valve, but also expands its application range, enabling it to meet more diverse needs.

[0020] In the above technical solution, the valve core forms a first pressure chamber and a second pressure chamber at both ends of the moving direction and the valve body, respectively. The valve body is provided with an oil passage in communication with the first pressure chamber and the second pressure chamber, respectively, and a pilot valve is arranged on the oil passage.

[0021] In this way, the pilot valve controls the oil passage to inject oil into the first pressure chamber and the second pressure chamber, respectively, according to the load demand, forming oil pressure, which pushes the valve core to move left and right, thereby changing the opening state of the fluid inlet hole and the fluid outlet hole, and achieving adjustment and control of the pressure and flow of the fluid.

[0022] In the above technical solution, by designing a pilot control oil passage, the control oil and the system oil are isolated, thereby avoiding the influence of the system oil on the displacement of the valve core, thereby helping to improve the response speed of the control valve.

[0023] In some technical solutions, the pilot valve is a pilot proportional valve or a proportional electromagnetic valve.

[0024] In some technical solutions, considering the failure of the pilot valve, in order to deal with emergency situations and ensure safety, the control valve further includes an emergency device. The emergency device is connected to the valve core and is used to push the valve core to move. In this way, in the event of an emergency, the valve core can be pushed to move by controlling the emergency device, thereby changing the opening state of the fluid inlet hole and the fluid outlet hole to ensure safety.

[0025] In actual application, the emergency device includes: a connecting piece slidably arranged in the first pressure chamber or the second pressure chamber, the connecting piece being connected to the valve core; and a pushing piece slidably arranged on the valve body, used to push the connecting piece to move, thereby driving the valve core to move.

[0026] In the technical solution, the elastic member is arranged between the connecting member and the valve core. In this way, when the oil pressure pushes the valve core to move to the limit position, the elastic member is compressed when the valve core continues to move, so that the control valve is prevented from being damaged due to over-movement, thereby helping to improve the service life of the control valve.

[0027] In some technical solutions, the control valve further comprises a displacement feedback device; the displacement feedback device is used to monitor the displacement distance of the valve core in real time. In this way, when adjustment is performed, the displacement distance of the valve core is monitored in real time by the displacement feedback device to determine the current position of the valve core, so as to ensure that the valve core is accurately moved to the predetermined position; at the same time, the displacement information can be fed back to the control system, so as to perform accurate adjustment, and the response speed of the control valve is also improved.

[0028] According to a second aspect of the present application, the present application provides a hydraulic system, which comprises a control pressure oil source, a system pressure oil source and the control valve provided in any of the above technical solutions. The control pressure oil source is connected with the valve core to drive the displacement of the valve core, and the system pressure oil source is communicated with the fluid inlet hole and the fluid outlet hole. In this way, the hydraulic system has all the beneficial effects of any of the above technical solutions, which will not be repeated here.

[0029] According to a third aspect of the present application, the present application provides a working machine, which comprises the control valve or the hydraulic system provided in any of the above technical solutions. In this way, the working machine has all the beneficial effects of any of the above technical solutions, which will not be repeated here.

[0030] According to a fourth aspect of the present application, the present application provides a hydraulic control method, which is used in the working machine provided in any of the above technical solutions, and the hydraulic control method specifically comprises the following steps:

[0031] The displacement of the valve core is controlled by using the pilot valve and the control pressure oil source, so as to adjust the different opening degrees of the fluid inlet hole and the fluid outlet hole, and form proportional control of the flow and pressure of the system pressure oil source.

[0032] Since the hydraulic control method is realized by using the control valve provided in any of the above technical solutions, the hydraulic control method has all the beneficial effects of any of the above technical solutions, which will not be repeated here.

[0033] According to a fifth aspect of the present application, the present application provides a hydraulic control device, which is used in the hydraulic control method provided in any of the above technical solutions, and the hydraulic control device specifically comprises:

[0034] The control module is configured to control the displacement of the spool by using the pilot valve and the control pressure oil source, so as to adjust the different opening degrees of the fluid inlet hole and the fluid outlet hole, and form proportional control of the flow and pressure of the system pressure oil source.

[0035] According to a sixth aspect of the present application, the present application provides another working machine, comprising: a memory, a processor;

[0036] The memory stores computer-executable instructions;

[0037] The processor executes the computer-executable instructions stored in the memory, so that the processor implements the method according to the fourth aspect.

[0038] According to a seventh aspect of the present application, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are executed by a processor to implement the method according to the fourth aspect.

[0039] According to an eighth aspect of the present application, the present application provides a computer program product, comprising a computer program, wherein the computer program is executed by a processor to implement the method according to the fourth aspect.

[0040] Additional aspects and advantages of the present application will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0041] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0042] FIG. 1 is a structural schematic view of a control valve according to the present application;

[0043] FIG. 2 is an enlarged structural schematic view of A in FIG. 1;

[0044] FIG. 3 is a structural schematic view of a hydraulic system according to the present application.

[0045] In FIGS. 1-3, the correspondence between the reference numerals and the component names is as follows:

[0046] 10 - control valve; 100 - valve body; 110 - valve cavity; 120 - fluid inlet hole; 130 - fluid outlet hole; 140 - first pressure chamber; 150 - second pressure chamber; 160 - oil passage;

[0047] 200 - spool; 210 - annular groove; 211 - first throttling edge; 212 - second throttling edge; 300 - pilot valve; 400 - emergency device; 410 - connecting piece; 420 - pushing piece; 430 - elastic piece; 500 - displacement feedback device; 600 - fluid passage;

[0048] 21 - system pressure oil source; 22 - control pressure oil source. Embodiments of the present application

[0049] In order to more clearly understand the above objectives, features and advantages of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0050] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and therefore the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0051] The control valve, hydraulic system, working machine and hydraulic control method provided by the embodiments of the present application will be described in detail below with reference to Figs. 1 to 3 through specific embodiments and application scenarios.

[0052] Referring to Figs. 1 and 2, some embodiments of the present application provide a control valve, which has a structure including a valve body 100 and a valve core 200.

[0053] Specifically, the valve body 100 has a valve cavity 110 formed inside; the valve body 100 is provided with a fluid inlet hole 120 and a fluid outlet hole 130, and the fluid inlet hole 120 and the fluid outlet hole 130 are arranged in a circumferential direction (as shown by the Y direction in Fig. 1) of the valve body 100, i.e., the fluid inlet hole 120 and the fluid outlet hole 130 are not on the same plane or straight line of the valve body 100, but are distributed at different positions of the valve body 100. Among them, the fluid inlet hole 120 constitutes a P port for liquid inlet, and the fluid outlet hole 130 constitutes a T port for liquid outlet.

[0054] The valve core 200 is slidingly arranged on the valve cavity 110 and keeps consistent with the axis of the valve cavity 110. Moreover, the outer wall surface of the valve core 200 is tightly attached to the inner wall surface of the valve body 100. The outer wall surface of the valve core 200 is formed with an annular groove 210, which is used to communicate the fluid inlet hole 120 and the fluid outlet hole 130 to allow the fluid to pass through.

[0055] In operation, when the spool 200 moves to one side, one of the fluid inlet hole 120 and the fluid outlet hole 130 and the annular groove 210 remain in communication, and the other gradually deviates from the annular groove 210. In this way, when facing different load requirements, by controlling the back-and-forth movement of the spool 200, the opening state of the fluid inlet hole 120 and the fluid outlet hole 130 is changed, that is, the flow area from the P port to the T port is adjusted; the different opening states of the fluid inlet hole 120 and the fluid outlet hole 130 of the control valve result in different fluid flow rates, forming proportional control of the fluid flow rate, and finally realizing adjustment and control of the fluid pressure and flow rate. Thus, the adaptability of the control valve to multiple loads can be improved.

[0056] In the above embodiment, the annular groove 210 is provided on the outer wall surface of the spool 200 to form the fluid passage 600. However, it can be understood that the spool 200 can also be provided with a through hole or the like to form the fluid passage 600, and the present embodiment is not limited thereto.

[0057] In some embodiments, the annular groove 200 is provided with a first throttling edge 211 and a second throttling edge 212 on both sides of the movement direction (indicated by the X direction in FIG. 2).

[0058] Specifically, the first throttling edge 211 and the second throttling edge 212 have different shapes and structures. In this way, two flow area curves can be formed, so that multiple load requirements can be met, and the adaptability of the control valve to the control requirements of system flow rate and pressure can be further improved.

[0059] In the above embodiment, the first throttling edge 211 is designed as an arc shape, and the second throttling edge 212 is designed as a wave shape.

[0060] The arc shape design helps the fluid to realize a smoother transition when passing through the throttling edge, reduces the formation of fluid impact and vortex, and thus reduces energy loss and noise; at the same time, due to the relatively simple and continuous geometric characteristics of the arc shape, the corresponding flow area change curve is also more predictable, facilitating accurate control of flow rate and pressure. The wave shape design provides more flow path changes, so that the fluid can experience multiple different cross-sectional contractions and expansions when passing through, thereby realizing more flexible flow rate and pressure adjustment. Therefore, in the above embodiment, the first throttling edge 211 is designed as an arc shape, and the second throttling edge 212 is designed as a wave shape, which combines the advantages of both. Two completely different flow area curves can be formed. This means that during the adjustment of the control valve, according to the actual load requirements, by adjusting the position of the spool 200, the two throttling modes can be flexibly selected or switched, so as to realize optimal control of the system flow rate and pressure. This design not only improves the flexibility and adaptability of the control valve, but also expands its application range, so that it can meet more diversified requirements.

[0061] In the above embodiments, the valve core 200 is provided with a first pressure chamber 140 and a second pressure chamber 150 at both ends of the moving direction of the valve core 200 and the valve body 100 respectively. The valve body 100 is provided with an oil passage 160 in communication with the first pressure chamber 140 and the second pressure chamber 150 respectively, and the oil passage 160 is provided with a pilot valve 300.

[0062] In this way, the pilot valve 300 controls the oil passage 160 to inject oil to the first pressure chamber 140 and the second pressure chamber 150 respectively according to the load demand, and forms oil pressure, which pushes the valve core 200 to move left and right, so as to change the opening state of the fluid inlet hole 120 and the fluid outlet hole 130, and realize the adjustment and control of the pressure and flow of the fluid. In the embodiments, the pilot control oil passage is designed to isolate the control oil and the system oil, so as to avoid the influence of the system oil on the displacement of the valve core 200, thereby helping to improve the response speed of the control valve.

[0063] In actual applications, the pilot valve 300 can be a pilot proportional valve or a proportional electromagnetic valve.

[0064] Considering the failure of the pilot valve 300, in some embodiments, the control valve further comprises an emergency device 400 connected with the valve core 200 and used to push the valve core 200 to move. In this way, in the case of an emergency, the valve core 200 can be pushed to move by controlling the emergency device 400, so as to change the opening state of the fluid inlet hole 120 and the fluid outlet hole 130, thereby ensuring safety.

[0065] In the above embodiments, the emergency device 400 comprises a connecting piece 410 and a pushing piece 420. The connecting piece 410 is slidingly arranged in the first pressure chamber 140 and connected with the valve core 200. The pushing piece 420 is slidingly arranged on the valve body 100. When an emergency occurs, the pushing piece 420 is controlled to move and contact the connecting piece 410, thereby driving the valve core 200 to move and changing the opening state of the fluid inlet hole 120 and the fluid outlet hole 130, so as to ensure safety.

[0066] It can be understood that the emergency device 400 can also be arranged in the second pressure chamber 150.

[0067] In actual applications, an elastic piece 430 is arranged between the connecting piece 410 and the valve core 200. In this way, when the valve core 200 is pushed to move to the limit position by oil pressure and continues to move, the elastic piece 430 can be compressed, thereby avoiding excessive movement of the valve core 200 to cause damage to the control valve, and thus helping to improve the service life of the control valve. Exemplarily, the elastic piece 430 is a spring and is sleeved on the connecting piece 410.

[0068] In order to accurately restore and move the valve core 200 to the required position, in some embodiments, a displacement feedback device 500 is further included. The displacement feedback device 500 is used to monitor the displacement distance of the valve core 200 to determine the position of the valve core 200. In this way, when adjusting, the displacement distance of the valve core 200 is monitored in real time by the displacement feedback device 500 to determine the current position of the valve core 200, so as to ensure that the valve core 200 is accurately moved to the predetermined position; at the same time, the displacement information can be fed back to the control system for accurate adjustment, and it is also helpful to improve the response speed of the control valve.

[0069] Referring to FIG. 3, in some embodiments, the present application further provides a hydraulic system, which comprises a system pressure oil source 21, a control pressure oil source 22, and the control valve 10 provided by any of the above embodiments. The control pressure oil source 22 is connected with the valve core 200 to drive the displacement of the valve core 200; and the system pressure oil source 21 is in communication with the fluid inlet hole 120 and the fluid outlet hole 130. Therefore, the hydraulic system has all the beneficial effects of any of the above embodiments, which will not be repeated here.

[0070] In some embodiments, the present application further provides a working machine, which comprises the control valve or the hydraulic system provided by any of the above embodiments. Therefore, the working machine has all the beneficial effects of any of the above embodiments, which will not be repeated here.

[0071] In some embodiments, the present application further provides a hydraulic control method for the hydraulic system or the working machine provided by any of the above embodiments. The specific steps of the hydraulic control method are:

[0072] The displacement of the valve core 200 is controlled by the pilot valve 300 and the control pressure oil source 22, so as to adjust the different opening degrees of the fluid inlet hole 120 and the fluid outlet hole 130, and form proportional control of the flow and pressure of the system pressure oil source 21.

[0073] Specifically, according to the load demand, the pilot valve 300 controls the oil passage 160 to inject oil into the first pressure chamber 140 or the second pressure chamber 150 to form oil pressure, which pushes the valve core 200 to move and changes the opening state of the fluid inlet hole 120 and the fluid outlet hole 130, so as to change the flow area from the fluid inlet hole 120 to the fluid outlet hole 130; at this time, the displacement feedback device 500 monitors the displacement distance of the valve core 200 in real time to determine the current position of the valve core 200, so as to ensure that the valve core 200 is accurately moved to the predetermined position; at the same time, the displacement information is fed back to the control system of the hydraulic system or the working machine.

[0074] Since the hydraulic control method is realized by the control valve provided by any of the above embodiments, it has all the beneficial effects of any of the above embodiments, which will not be repeated here.

[0075] In some embodiments, the present application also provides a hydraulic control device for the hydraulic control method provided in any of the above embodiments. The hydraulic control device specifically includes:

[0076] The control module is configured to control the displacement of the spool 200 by using the pilot valve 300 and the control pressure oil source 22, so as to adjust the different opening degrees of the fluid inlet hole 120 and the fluid outlet hole 130, and form proportional control of the flow and pressure of the system pressure oil source 21.

[0077] In some embodiments, the present application also provides another working machine, which includes a memory and a processor.

[0078] The memory stores computer-executable instructions.

[0079] The processor executes the computer-executable instructions stored in the memory, so that the processor implements the hydraulic control method provided in any of the above embodiments.

[0080] Specifically, the processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor, etc. The steps of the method disclosed in the application can be directly embodied as the execution of the hardware processor, or be executed by the combination of hardware and software modules in the processor.

[0081] The memory can include a random access memory (RAM), and can also include a non-volatile memory (NVM), such as at least one disk memory.

[0082] In some embodiments, the present application also provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are executed by a processor, the computer-executable instructions are used to implement the hydraulic control method provided in any of the above embodiments.

[0083] Specifically, the storage medium can include a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0084] In some embodiments, the present application also provides a computer program product comprising a computer program which, when executed by a processor, implements the hydraulic control method provided by any of the above embodiments.

[0085] It should be noted that, in the claims, the specification and the drawings of the present application, the terms "multiple" means two or more, unless otherwise specifically limited, and the terms "upper", "lower", and the like, indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only used to facilitate the description of the present application and make the description process more simple, and are not intended to indicate or imply that the device or element must have the specific orientation described, be constructed and operated in a specific orientation, therefore these descriptions cannot be understood as a limitation on the present application; the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be a fixed connection between objects, or a detachable connection between objects, or an integral connection; can be a direct connection between objects, or an indirect connection between objects through an intermediate medium. 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 of the above data.

[0086] In the claims, the specification and the drawings of the present application, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the claims, the specification and the drawings of the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0087] The above is only the preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A control valve characterized by comprising: The control valve comprises: a valve body, an inner part of which has a valve cavity, and the valve body is provided with fluid inlet holes and fluid outlet holes arranged in a staggered manner in a circumferential direction; a valve core which is slidingly arranged in the valve cavity, and an outer wall surface of the valve core is in close contact with an inner wall surface of the valve body; a fluid passage is arranged on the valve core, and the fluid passage is used to connect the fluid inlet holes and the fluid outlet holes; when the valve core moves to one side, one of the fluid inlet holes and the fluid outlet holes is kept in communication with the fluid passage, and the other is gradually staggered with the fluid passage.

2. The control valve according to claim 1, characterized in that An annular groove is arranged on the outer wall surface of the valve core to form the fluid passage, and the annular groove is respectively provided with a first throttling edge and a second throttling edge on both sides in the moving direction.

3. The control valve according to claim 2, characterized in that The first throttling edge is designed in an arc shape, and / or the second throttling edge is designed in a wave shape.

4. The control valve of claim 1, wherein The valve core is respectively provided with a first pressure chamber and a second pressure chamber at both ends in the moving direction; wherein the valve body is provided with oil paths which are respectively connected with the first pressure chamber and the second pressure chamber; the oil paths are provided with a pilot valve.

5. The control valve according to claim 4, characterized in that The control valve further comprises an emergency device which is connected with the valve core and is used to push the valve core to move.

6. The control valve according to claim 5, characterized in that The emergency device comprises: a connecting piece which is slidingly arranged in the first pressure chamber or the second pressure chamber, and the connecting piece is connected with the valve core; a pushing piece which is slidingly arranged on the valve body and is used to push the connecting piece to move; an elastic piece which is arranged between the connecting piece and the valve core.

7. The control valve according to any one of claims 1 to 6, characterized in that The control valve further comprises a displacement feedback device which is used to monitor the displacement distance of the valve core in real time.

8. A hydraulic system characterized by, The hydraulic system comprises a control pressure oil source, a system pressure oil source and the control valve according to any one of claims 1 to 7. The control pressure oil source is connected with the valve core to drive the valve core to displace. The system pressure oil source is connected with the fluid inlet holes and the fluid outlet holes.

9. A work machine characterized by, The hydraulic system comprises the control valve according to any one of claims 1 to 7 or the hydraulic system according to claim 8. The hydraulic control method is used for the working machine according to claim 9, and the hydraulic control method comprises the following steps:

10. A hydraulic control method, characterized by, the displacement of the valve core is controlled by using the pilot valve and the control pressure oil source, so that the different opening degrees of the fluid inlet holes and the fluid outlet holes are adjusted to form proportional control of the flow and pressure of the system pressure oil source. The hydraulic control device is used for the hydraulic control method according to claim 10, and the hydraulic control device comprises:

11. A hydraulic control device characterized by comprising: a control module which is used to control the displacement of the valve core by using the pilot valve and the control pressure oil source, so that the different opening degrees of the fluid inlet holes and the fluid outlet holes are adjusted to form proportional control of the flow and pressure of the system pressure oil source. The hydraulic control device comprises:

12. A work machine characterized by, a processor and a memory; the memory stores computer execution instructions; the processor executes the computer execution instructions stored in the memory to realize the method according to claim 10. The computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by the processor to realize the method according to claim 10.

13. A computer-readable storage medium, characterized in that, The computer program is executed by the processor to realize the method according to claim 10.

14. A computer program product, characterised in that, ​

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