Hydraulic control steering device, control method for hydraulic control steering device, and work machine

Abstract

The present application relates to the technical field of hydraulics and provides a hydraulic control steering device, a control method for a hydraulic control steering device, and a work machine, wherein the hydraulic control steering device includes a pilot valve, a control valve, a state detection element, and a control device, the pilot valve includes a pilot valve body and an operating mechanism, the pilot valve body has an oil inlet and at least two oil outlets, state switching of the operating mechanism controls valve position switching of the pilot valve body to selectively connect or block the at least two oil outlets and the oil inlet, the oil outlets are connected to the hydraulic control port of the hydraulic control switching valve, and the control valve is provided in an oil passage between a pilot oil source and the oil inlet, and the opening and closing of the oil passage can be controlled by operating the control valve, the state detection element detects state information of the operating mechanism, and the state detection element and the control valve are both electrically connected to the control device, and the control device controls the opening and closing of the oil passage according to the state information of the operating mechanism and the state information of the work machine.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority from a Chinese patent application bearing application number 202410002739.X, filed on January 2, 2024, entitled "Hydraulic Control Steering Device, Control Method for Hydraulic Control Steering Device, and Working Machine," the entire contents of which are incorporated herein by reference.

[0002] [Technical field] The present application relates to the technical field of hydraulic systems, and more particularly to a hydraulic control steering device, a control method for a hydraulic control steering device, and a work machine. [Background technology]

[0003] As the applications of work machinery become more diverse, the structure of work machinery tends to develop in terms of precision, humanization, and ease of operation and maintenance. For example, taking a crane as an example, in the related art, the boom extension / retraction operation, luffing operation, and winch mechanism winding / unwinding operation of the crane each correspond to a set of execution mechanisms, and each set of execution mechanisms corresponds to a main valve. Taking the boom extension / retraction operation as an example, the execution element for driving the boom extension / retraction operation is connected to a main valve, which is a hydraulic control switching valve, and the two hydraulic control ports of the main valve are connected to the oil outlets of the pilot valve. The operator can control the operation of the pilot valve by operating the pilot valve operating handle, thereby controlling the flow direction of the pilot oil. When pilot oil flows to different hydraulic control ports, the main valve switches to different operating positions, which causes the execution mechanism to switch the operating direction and realize the switching of the boom extension / retraction operation. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application provides a hydraulic control steering device, a control method for a hydraulic control steering device, and a work machine to solve the drawback of the complicated structure of the pilot oil passage of the work machine in the prior art. [Means for solving the problem]

[0005] This application is a pilot valve including a pilot valve body and an operating mechanism, the pilot valve body having an oil inlet and at least two oil outlets, the state switching of the operating mechanism being suitable for controlling the valve position switching of the pilot valve body, thereby selectively connecting or blocking the at least two oil outlets and the oil inlet, and the oil outlet being connected to a hydraulic control port of a hydraulic control switching valve; a control valve that is provided in an oil passage between a pilot oil source and the oil inlet and that can control opening and closing of the oil passage by operating the control valve; a state detection element configured to detect state information of the operating mechanism; A hydraulic control operation device is provided that includes a control device, wherein the state detection element and the control valve are both electrically connected to the control device, and the control device is configured to be able to control the opening and closing of the oil passage in accordance with state information of the operating mechanism and state information of the work machine.

[0006] In the hydraulic control operation device according to the present application, the pilot valve body has at least two ejector pins, and the operating mechanism includes an operating handle that can interact with each of the ejector pins, the state detection element includes a position sensor; Each of the ejector pins is provided with one of the position sensors, and the position sensors are configured to be able to detect the relative position between the ejector pin and the operating mechanism.

[0007] In the hydraulically controlled operation device according to the present application, the position sensor includes a microswitch or a first pressure sensor, the microswitch is configured to be able to abut against the operating mechanism or the ejector pin, and the first pressure sensor is configured to be able to detect the pushing force between the ejector pin and the operating mechanism.

[0008] In the hydraulic control operation device according to the present application, the state detection element includes a second pressure sensor, Each of the hydraulic control ports is provided with one corresponding second pressure sensor, and the second pressure sensor is configured to be able to detect the magnitude of the hydraulic pressure at the hydraulic control port.

[0009] In the hydraulic control operation device according to the present application, the pilot valve body has two pairs of oil outlets, and one pair of the oil outlets is connected to one hydraulic control changeover valve.

[0010] In the hydraulic control operation device according to the present application, at least two pilot valves and at least two control valves are provided, and each of the control valves is connected to the same pilot oil source.

[0011] In the hydraulic control operation device according to the present application, the control valve is an electric proportional control valve.

[0012] The present application further provides a work machine including the hydraulic control steering device described above.

[0013] The present application provides a control method for a hydraulic control steering device applied to the above-mentioned work machine, acquiring status information of the operating mechanism and status information of the work machine; determining operation tendency information of the work machine in accordance with state information of the operation mechanism; The present invention further provides a method for controlling a hydraulic control steering device, the method including a step of controlling the open / closed state of an oil passage between an oil inlet of the pilot valve and a pilot oil source in accordance with operation trend information of the work machine and status information of the work machine.

[0014] In the control method for a hydraulic control operation device according to the present application, the control valve is an electric proportional control valve, the operation mechanism includes an operation handle, and state information of the operation mechanism includes at least an operating range of the operation handle, the control method for the hydraulic control operation device comprises: The method further includes a step of controlling the opening degree of the electric proportional control valve in accordance with the operating width of the operating handle.

[0015] In order to more clearly explain the technical solutions in the present application or the prior art, the drawings necessary for use in the description of the embodiments or the prior art will be briefly described below. It will be apparent that the drawings described below are some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without any creative work. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a structural schematic diagram of a hydraulic control steering device according to the present application. [Figure 2] 1 is a flowchart 1 of a control method for a hydraulic control steering device according to the present application. [Figure 3] 4 is a flowchart 2 of the control method for the hydraulic control steering device according to the present application. DETAILED DESCRIPTION OF THE INVENTION

[0017] In order to clarify the purpose, technical solution and advantages of the present application, the technical solution of the present application will be described below clearly and completely with reference to the drawings of the present application, and it is obvious that the described embodiments are only some of the embodiments of the present application, but not all of the embodiments, and all other embodiments that a person skilled in the art can obtain without creative work based on the embodiments of the present application fall within the scope of protection of the present application.

[0018] In describing the embodiments of the present application, it should be understood that orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are based on the illustrations and are used merely for convenience and simplification of the description of the embodiments of the present application, and do not indicate or imply that such devices or elements necessarily have a particular orientation or are constructed and operated in a particular orientation, and therefore do not limit the embodiments of the present application. It should also be understood that the terms "first," "second," and "third" are used for descriptive purposes only and do not indicate or imply relative importance.

[0019] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, the terms "connection" and "connection" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection via an intermediate medium. Those skilled in the art will be able to understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0020] In the embodiments of the present application, unless otherwise clearly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact with each other, or that the first and second features are in indirect contact with each other via an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may only mean that the first feature is directly above or diagonally above the second feature, or that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below," or "below" a second feature may also mean that the first feature is directly below or diagonally below the second feature, or that the horizontal height of the first feature is lower than that of the second feature.

[0021] In the description herein, a description that refers to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described with reference to the embodiment or example is included in at least one embodiment or example of the present application. In the description herein, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be appropriately combined in any one or more embodiments or examples. Furthermore, if not mutually inconsistent, those skilled in the art may combine or combine different embodiments or examples and features of different embodiments or examples described herein.

[0022] Hereinafter, a hydraulic control operation device according to an embodiment of the present invention will be described with reference to FIGS.

[0023] As shown in FIGS. 1 to 3, an embodiment of the present application provides a hydraulic control operation device including a pilot valve, a control valve 6, a state detection element, and a control device.

[0024] Specifically, the pilot valve includes a pilot valve body 1 and an operating mechanism, the pilot valve body 1 has an oil inlet 2 and at least two oil outlets 3, and the oil outlets 3 are connected to hydraulic control ports 5 of the hydraulic control switching valve 4.

[0025] The pilot valve body 1 includes a valve core and a valve element, and the valve core moves relative to the valve element to connect the oil inlet 2 to different oil outlets 3. The operating mechanism is connected to the pilot valve body 1 and can control the operation of the valve core. The operating mechanism can be switched, and switching the state of the operating mechanism can control the valve position switching of the pilot valve body 1, thereby selectively connecting or blocking communication between at least two oil outlets and the oil inlet.

[0026] That is, when the state of the operating mechanism is different, the pilot oil at the position of the oil inlet 2 can flow out from different oil outlets 3, thereby acting on different hydraulic control ports 5 and controlling the switching of the hydraulic control switching valve 4.

[0027] The number of states of the operating mechanism is one more than the number of oil outlets of the pilot valve body 1, and when the operating mechanism is in the initial state, none of the oil outlets communicates with the oil inlet.

[0028] A control valve 6 is provided in the oil passage between the pilot oil source and the oil inlet 2, and the opening and closing of the oil passage can be controlled by the operation of the control valve 6. The state detection element and the control valve 6 are both electrically connected to the control device, and the state detection element is used to detect state information of the operating mechanism, and the control device controls the opening and closing of the oil passage according to the state information of the operating mechanism and the state information of the work machine.

[0029] With this configuration, after the operating mechanism operates, the operation of the control valve 6 is controlled by detecting the status information of the operating mechanism, and it is determined whether or not to supply pilot oil to the oil inlet 2 of the pilot valve body 1. This eliminates the need to place a control valve 6 in each of the hydraulic control ports 5 of the hydraulic control switching valve 4, ensuring the operation and safety of the work machine, effectively reducing the number of control valves 6, simplifying the structure of the pilot oil passage, facilitating inspection and maintenance, reducing costs, and solving the problem of the complicated structure of the pilot oil passage of the work machine in the prior art.

[0030] The control valve 6 can be a two-position, three-way solenoid valve. The structural principle is shown in the diagram. The pilot valve also has an oil return port, which is connected to the oil tank. When the operating mechanism is in a specific state, the oil outlet 3, which is not connected to the oil inlet 2, is connected to the oil return port.

[0031] The work machine status information includes information such as the position and attitude of the work machine. Taking a crane as an example, the status information includes the boom pitch angle and boom extension / retraction degree. If the crane's current boom pitch angle and boom extension degree cause a critical state of crane stability, reducing the boom pitch angle or lengthening the boom will cause the crane to tip over. In this case, when the operating mechanism's state corresponds to reducing the boom pitch angle or continuing to lengthen the boom, the control device controls the oil line between the pilot oil source and the pilot valve oil inlet 2 to a closed state. When the operating mechanism's state corresponds to increasing the boom pitch angle or shortening the boom, the control device controls the oil line between the pilot oil source and the pilot valve oil inlet 2 to a connected state.

[0032] The pilot valve body 1 has at least two ejector pins 7, each of which corresponds to a valve core in a one-to-one relationship, and the ejector pins 7 are slidable relative to the valve body.

[0033] The operating mechanism includes an operating handle, which can interact with each ejector pin 7. The operating handle can be adjusted in different directions, and the state of the operating mechanism includes at least the operating direction of the operating handle. When the operating handle operates in different directions, different ejector pins 7 slide relative to the valve body, which in turn operates different valve cores, and the oil outlets 3 communicating with the oil inlets 2 also differ.

[0034] When the operating direction of the operating handle is different, the relative position between each ejector pin 7 and the operating handle is different. In some embodiments, position sensors are selected as the state detection elements, the number of position sensors is the same as the number of ejector pins 7, one position sensor is disposed on each ejector pin 7, and each position sensor is used to detect the relative position between each ejector pin 7 and the operating handle.

[0035] A microswitch 8 may be selected as the position sensor, and each microswitch 8 is provided on the side of each ejector pin 7 facing the operating handle, and when the operating handle is operated, the position of the operating handle corresponding to the operating direction gradually approaches the ejector pin 7 in the operating direction, and when the operating handle abuts against the microswitch 8, the microswitch 8 is triggered. Each microswitch 8 may be provided on the operating handle, and each microswitch 8 may be directly opposite each ejector pin 7.

[0036] The first pressure sensors may be selected as position sensors, and are used to detect the ejection force between each ejector pin 7 and the operating handle. As with the microswitches 8, the number of first pressure sensors is the same as the number of ejector pins 7, and one first pressure sensor is disposed on each ejector pin 7, and each first pressure sensor may be provided on the side of each ejector pin 7 facing the operating handle, or each first pressure sensor may be provided on the operating handle, and each first pressure sensor may be directly opposite each ejector pin 7.

[0037] At this time, the control valve 6 may be kept always in the OFF state, and after the direction of movement of the operating handle is detected by a position sensor, the operation of the control valve 6 is controlled in combination with the status information of the work machine. The control valve 6 is always in the OFF state, and is switched to the ON state only when it is determined that switching of the hydraulic control switching valve 4 is permitted, which is advantageous for extending the service life of the control valve 6 and reducing the occurrence of failures of solenoid valves.

[0038] In some other embodiments, the control valve 6 may be always on, and when the operating handle is not operated, none of the oil outlets 3 of the pilot valve communicates with the oil inlet 2, and the hydraulic pressure of each hydraulic control port 5 is the same. When the operating handle is operated, the oil outlet 3 corresponding to the operating handle's operating direction communicates with the pilot valve's oil inlet 2, allowing pilot oil to flow to that oil outlet 3, and the hydraulic pressure of the hydraulic control port 5 connected to that oil outlet 3 increases. Therefore, the operating handle's operating direction can be determined by detecting the hydraulic pressure of each hydraulic control port 5.

[0039] After determining the direction of movement of the operating handle, the operation of the control valve 6 is controlled in combination with the status information of the work machine. If it is determined that switching of the hydraulic control changeover valve 4 is permitted, the control valve 6 can be controlled to maintain the connected state, and if it is determined that switching of the hydraulic control changeover valve 4 is not permitted, the control valve 6 can be controlled to switch to the shutoff state.

[0040] Specifically, the state detection element includes second pressure sensors, the number of which is the same as the number of hydraulic control ports 5, with one second pressure sensor disposed in each hydraulic control port 5, and each second pressure sensor being used to detect the hydraulic pressure at each hydraulic control port 5.

[0041] In the embodiment of the present application, the pilot valve body 1 has two pairs of oil outlets 3, each pair of oil outlets 3 is connected to one hydraulic control switching valve 4, and one pilot valve can be connected to two hydraulic control switching valves 4. The operating handle can be moved in four directions, forward, backward, left, and right, and moving it in one of these directions can connect one of the oil outlets 3 to the oil inlet 2.

[0042] At least two pilot valves and two control valves 6 are provided, and each control valve 6 is connected to the same pilot oil source, so that the hydraulic control steering device can control a plurality of hydraulic control switching valves 4.

[0043] In the case of a double winch crane, the crane has a main winch and a secondary winch, the pitch angle of the crane's boom is adjustable, and the boom is extendable and retractable. Two pilot valves and two control valves 6 may be provided, each with two pairs of oil outlets 3, one pilot valve may be connected to a hydraulic control switch valve 4 for controlling the operation of the main winch and a hydraulic control switch valve 4 for controlling changes in the boom pitch angle, and the other pilot valve may be connected to a hydraulic control switch valve for controlling the operation of the secondary winch and a hydraulic control switch valve for controlling the extension and retraction of the boom.

[0044] In the embodiment of the present application, an electric proportional control valve can be selected, and the state detection element can detect not only the moving direction of the operating handle but also the moving range of the operating handle, and the control device generates different electric signals according to the moving range of the operating handle, thereby controlling the opening degree of the electric proportional control valve and realizing high-precision control of the work operation.

[0045] In another aspect, an embodiment of the present application further provides a work machine including a hydraulic control steering device according to any one of the above embodiments. The hydraulic control steering device according to the above embodiments has the advantages of being simple in structure and low in cost. Therefore, the work machine according to this embodiment has the advantages of being simple in structure, easy to maintain, and low in cost. The process of deriving the beneficial effects of the work machine in the embodiment of the present application is substantially similar to the process of deriving the beneficial effects of the hydraulic control steering device described above, so a duplicated explanation will be omitted here.

[0046] In the embodiments of the present application, the type of work machine is not limited, and the work machine may be, for example, an excavator, a crane, a loader, etc. In other words, any work machine may be used as long as it is capable of using the hydraulic control steering device in the embodiments of the present application.

[0047] In yet another aspect, the present application further provides a control method for a hydraulic control steering device applied to the above-described work machine. The control method for a hydraulic control steering device described below can be referenced correspondingly to the hydraulic control steering device described above.

[0048] As shown in FIGS. 2 and 3, the control method for a hydraulic control operation device according to an embodiment of the present application includes steps 110 to 130.

[0049] In step 110, status information of the operating mechanism and status information of the work machine are acquired.

[0050] In step 120, operational tendency information of the work machine is determined in accordance with the status information of the operating mechanism.

[0051] In step 130, the open / closed state of the oil passage between the oil inlet of the pilot valve and the pilot oil source is controlled in accordance with the operation tendency information of the work machine and the state information of the work machine.

[0052] In the embodiment of the present application, the control valve 6 is an electric proportional control valve, the operating mechanism includes an operating handle, the state information of the operating mechanism includes at least the operating range of the operating handle, and the control method of the hydraulic control operation device includes: The method further includes a step of controlling the opening degree of the electric proportional control valve in accordance with the operating width of the operating handle.

[0053] The process of deriving the beneficial effects of the control method for the hydraulic control control device in the embodiment of the present application is almost the same as the process of deriving the beneficial effects of the hydraulic control control device described above, so a duplicated explanation will be omitted here.

[0054] It should be noted that the above examples are only for explaining the technical solutions of the present application, and are not intended to limit the same. The present application has been described in detail with reference to the above examples. However, as can be understood by those skilled in the art, the technical solutions described in the above examples may be modified or some of the technical features may be replaced with equivalents, and these modifications and replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application. [Explanation of symbols]

[0055] 1. Pilot valve body 2, oil inlet 3, oil outlet 4. Hydraulic control switching valve 5. Hydraulic control port 6. Control valve 7. Ejector pin 8. Microswitch

Claims

1. A hydraulically controlled steering device, a pilot valve including a pilot valve body and an operating mechanism, the pilot valve body having an oil inlet and at least two oil outlets, the state switching of the operating mechanism being suitable for controlling the valve position switching of the pilot valve body, thereby selectively connecting or blocking the at least two oil outlets and the oil inlet, and the oil outlet being connected to a hydraulic control port of a hydraulic control switching valve; a control valve that is provided in an oil passage between a pilot oil source and the oil inlet and that can control opening and closing of the oil passage by operating the control valve; a state detection element configured to detect state information of the operating mechanism; a control device, wherein the state detection element and the control valve are both electrically connected to the control device, and the control device is configured to be able to control the opening and closing of the oil passage in accordance with state information of the operating mechanism and state information of the work machine.

2. the pilot valve body has at least two ejector pins, and the operating mechanism includes an operating handle interactable with each of the ejector pins; the state detection element includes a position sensor; 2. The hydraulic control operation device according to claim 1, wherein each of the ejector pins is provided with one of the position sensors, and the position sensor is configured to be able to detect the relative position between the ejector pin and the operating handle.

3. 3. The hydraulic control operation device according to claim 2, wherein the position sensor includes a microswitch or a first pressure sensor, the microswitch being configured to be able to abut against the operating handle or the ejector pin, and the first pressure sensor being configured to be able to detect an ejection force between the ejector pin and the operating handle.

4. the state detection element includes a second pressure sensor; 2. The hydraulic control steering device according to claim 1, wherein each of the hydraulic control ports is provided with one corresponding second pressure sensor, and the second pressure sensor is configured to detect the magnitude of hydraulic pressure at the hydraulic control port.

5. 2. The hydraulic control operation device according to claim 1, wherein the pilot valve body has two pairs of the oil outlets, and one pair of the oil outlets is connected to one of the hydraulic control changeover valves.

6. 6. The hydraulic control steering device according to claim 5, wherein at least two of the pilot valves and at least two of the control valves are provided, and each of the control valves is connected to the same pilot oil source.

7. 7. A hydraulic control steering device according to claim 1, wherein the control valve is an electric proportional control valve.

8. A work machine comprising the hydraulic control steering device according to any one of claims 1 to 7.

9. A control method for a hydraulic control steering device applied to a work machine according to claim 8, comprising: acquiring status information of the operating mechanism and status information of the work machine; determining operation tendency information of the work machine in accordance with state information of the operating mechanism; and controlling the open / closed state of an oil passage between an oil inlet of the pilot valve and a pilot oil source in accordance with operation trend information of the work machine and status information of the work machine.

10. The control valve is an electric proportional control valve, the operation mechanism includes an operation handle, and state information of the operation mechanism includes at least an operating range of the operation handle, and the control method of the hydraulic control operation device comprises:

10. The method for controlling a hydraulic control operation device according to claim 9, further comprising the step of controlling an opening degree of the electric proportional control valve in accordance with the operating range of the operating handle.

Images