Hydraulic-controlled steering device, control method for hydraulic-controlled steering device, and working machine

Abstract

A hydraulic-controlled steering device, a control method for a hydraulic-controlled steering device, and a working machine. The hydraulic-controlled steering device comprises a pilot valve, a control valve (6), state detection elements, and a control device; the pilot valve comprises a pilot valve body (1) and operating mechanisms; the pilot valve body (1) is provided with an oil inlet (2) and at least two oil outlets (3); state switching of the operating mechanisms controls valve position switching of the pilot valve body (1), so that the at least two oil outlets (3) and the oil inlet (2) are selectively connected or disconnected, and the oil outlets (3) are connected to hydraulic control ports of a hydraulic-controlled directional valve (4); the control valve (6) is arranged on an oil path between a pilot oil source and the oil inlet, and the action of the control valve (6) can control on / off of the oil path; the state detection elements detect state information of the operating mechanisms; and the state detection elements and the control valve (6) are both electrically connected to the control device, and the control device controls on / off of the oil path on the basis of the state information of the operating mechanisms and state information of the working machine.

Description

Hydraulic control device, control method of hydraulic control device and operating machine

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202410002739.X, filed on January 2, 2024, entitled “Hydraulic control device, control method for hydraulic control device and operating machinery”, which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application relates to the technical field of hydraulic systems, and in particular to a hydraulically controlled operating device, a control method for the hydraulically controlled operating device, and an operating machine. Background Art

[0004] With the development of diversified applications of operating machinery, the structure of operating machinery tends to be more refined, more humanized, and easier to operate and maintain. For example, taking a crane as an example, the telescopic action, boom amplitude change action, and retraction and extension action of the crane's hoisting mechanism in the relevant technology correspond to a group of actuators, and each group of actuators corresponds to a main valve. Taking the telescopic action of the boom as an example, the actuator used to drive the telescopic action of the boom is connected to a main valve. The main valve is a hydraulically controlled reversing valve. The two hydraulic control ports of the main valve are connected to the oil outlet of the pilot valve. The driver can control the action of the pilot valve by manipulating the operating handle of the pilot valve, thereby controlling the flow direction of the pilot oil. When the pilot oil flows to different hydraulic control ports, the main valve can be switched to different working positions, so that the actuator switches the direction of action, realizing the switching of the boom extension and retraction actions.

[0005] Summary of the Invention

[0006] The present application provides a hydraulically controlled operating device, a control method for the hydraulically controlled operating device, and an operating machine, so as to solve the defect of the complex structure of the pilot oil circuit of the operating machine in the prior art.

[0007] The present application provides a hydraulic control device, comprising:

[0008] A pilot valve comprising a pilot valve body and an operating mechanism, wherein the pilot valve body has an oil inlet and at least two oil outlets, and the operating mechanism is adapted to control the valve position switching of the pilot valve body so that the at least two oil outlets can be selectively connected to or blocked from the oil inlet, and the oil outlets are connected to the hydraulic control port of the hydraulically controlled reversing valve;

[0009] A control valve is provided in the oil circuit between the pilot oil source and the oil inlet, and the action of the control valve can control the on-off of the oil circuit;

[0010] a state detection element configured to detect state information of the operating mechanism;

[0011] A control device is provided, wherein the state detection element and the control valve are both electrically connected to the control device, and the control device is configured to control the on-off of the oil circuit according to the state information of the operating mechanism and the state information of the working machine.

[0012] According to a hydraulic control device provided by the present application, the pilot valve body has at least two push rods, and the operating mechanism includes an operating handle capable of interacting with each of the push rods;

[0013] The state detection element includes:

[0014] A position sensor is provided for each push rod, and the position sensor is configured to detect the relative position of the push rod and the operating mechanism.

[0015] According to a hydraulic control device provided in the present application, the position sensor includes a micro switch or a first pressure sensor, the micro switch is configured to be able to offset against the operating mechanism or to offset against the push rod, and the first pressure sensor is configured to be able to detect the squeezing force between the push rod and the operating mechanism.

[0016] According to a hydraulic control device provided by the present application, the state detection element includes:

[0017] A second pressure sensor is provided for each hydraulic control port, and the second pressure sensor is configured to detect the oil pressure at the hydraulic control port.

[0018] According to a hydraulically controlled operating device provided by the present application, the pilot valve body has two pairs of oil outlets, and one pair of oil outlets is correspondingly connected to one hydraulically controlled reversing valve.

[0019] According to a hydraulic control device provided by the present application, at least two pilot valves and at least two control valves are provided, and each control valve is connected to the same pilot oil source.

[0020] According to a hydraulic control device provided by the present application, the control valve is an electric proportional control valve.

[0021] The present application also provides an operating machine, comprising the above-mentioned hydraulic control device.

[0022] The present application further provides a control method for a hydraulically controlled operating device, which is applied to the above-mentioned working machine. The control method for the hydraulically controlled operating device includes:

[0023] Obtaining status information of operating mechanisms and operating machinery;

[0024] determining the movement trend information of the working machine according to the state information of the operating mechanism;

[0025] The on-off state of the oil passage between the oil inlet of the pilot valve and the pilot oil source is controlled according to the movement trend information of the working machine and the state information of the working machine.

[0026] According to a control method for a hydraulically controlled operating device provided by the present application, the control valve is an electric proportional control valve, the operating mechanism includes an operating handle, and the state information of the operating mechanism includes at least the movement amplitude of the operating handle. The control method for the hydraulically controlled operating device further includes:

[0027] The opening of the electric proportional control valve is controlled according to the movement amplitude of the operating handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] FIG1 is a schematic structural diagram of a hydraulic control device provided by the present application;

[0030] FIG2 is a flow chart of a control method of a hydraulic control device provided by the present application;

[0031] FIG3 is a second flow chart of the control method of the hydraulic control device provided in the present application.

[0032] Figure numerals: 1. Pilot valve body; 2. Oil inlet; 3. Oil outlet; 4. Hydraulic-controlled reversing valve; 5. Hydraulic control port; 6. Control valve; 7. Push rod; 8. Micro switch. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0034] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0036] In the embodiments of the present application, unless otherwise expressly 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, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do 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. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0038] The hydraulic control device according to the embodiment of the present application will be described below with reference to FIG. 1 to FIG. 3 .

[0039] As shown in FIG. 1 to FIG. 3 , an embodiment of the present application provides a hydraulic control device, including a pilot valve, a control valve 6 , a state detection element and a control device.

[0040] 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 . The oil outlets 3 are connected to the hydraulic control ports 5 of the hydraulically controlled reversing valve 4 .

[0041] The pilot valve body 1 comprises a valve core and a valve body. The valve core moves relative to the valve body, connecting the oil inlet 2 to different oil outlets 3. An operating mechanism is connected to the pilot valve body 1 and controls the movement of the valve core 6. The operating mechanism can switch states, and this switching of the operating mechanism controls the valve position of the pilot valve body 1, allowing at least two oil outlets to selectively connect to the oil inlet or medium.

[0042] That is to say, the state of the operating mechanism is different, and the pilot oil at the oil inlet 2 can flow out from different oil outlets 3, thereby acting on different hydraulic control ports 5 to control the reversing of the hydraulic control reversing valve 4.

[0043] It should be noted that the number of states of the operating mechanism is one more than the number of the oil outlets of the pilot valve body 1 . When the operating mechanism is in the initial state, none of the oil outlets is connected to the oil inlet.

[0044] Control valve 6 is located in the oil circuit between the pilot oil source and oil inlet 2. Its operation controls the flow of this oil circuit. Both the status detection element and control valve 6 are electrically connected to the control device. The status detection element detects the state of the operating mechanism. The control device then controls the flow of the oil circuit based on this information, along with the state of the operating mechanism and the working machine.

[0045] With such arrangement, after the operating mechanism is actuated, the action of the control valve 6 is controlled by detecting the status information of the operating mechanism to determine whether pilot oil is supplied to the oil inlet 2 of the pilot valve body 1. There is no need to configure a control valve 6 for each hydraulic control port 5 of the hydraulically controlled reversing valve 4. The action and safety of the operating machinery can also be ensured, the number of control valves 6 is effectively reduced, the structure of the pilot oil circuit is simplified, the inspection and maintenance are convenient, and the cost is reduced, thus solving the problem of the complex structure of the pilot oil circuit of the operating machinery in the prior art.

[0046] Control valve 6 can be a two-position, three-way solenoid directional valve. See the diagram for its structural principle. The pilot valve also has an oil return port, which is connected to the oil tank. When the operating mechanism is in a certain state, the oil outlet 3, which is not connected to the oil inlet 2, is connected to the oil return port.

[0047] The above-mentioned status information of the operating machinery includes information such as the position and posture of the operating machinery. Taking a crane as an example, its status information includes the boom's amplitude angle, the degree of boom extension, etc. If the crane's stability is critical at the current boom's amplitude angle and the current degree of boom extension, the crane may tip over if the boom's amplitude angle is reduced or the boom is extended. Therefore, if the state of the operating mechanism corresponds to reducing the boom's amplitude angle or continuing to extend the boom, the control device controls the oil circuit between the pilot oil source and the oil inlet 2 of the pilot valve to be in a closed state. If the state of the operating mechanism corresponds to increasing the boom's amplitude angle or shortening the boom, the control device controls the oil circuit between the pilot oil source and the oil inlet 2 of the pilot valve to be in a connected state.

[0048] The pilot valve body 1 has at least two push rods 7 , which correspond to the valve cores one by one. The push rods 7 can slide relative to the valve body.

[0049] The operating mechanism includes an operating handle that interacts with each push rod 7. The operating handle can be adjusted in different directions, and the state of the operating mechanism includes at least the direction of the operating handle's movement. Different operating handle movement directions result in different push rods 7 that can slide relative to the valve body, thus actuating different valve cores and, consequently, different oil outlets 3 connected to the oil inlet 2.

[0050] The relative position of each push rod 7 to the operating handle varies depending on the direction of the operating handle. In some embodiments, position sensors are selected as state detection elements. The number of position sensors is the same as the number of push rods 7, and each push rod 7 is equipped with a position sensor. Each position sensor is used to detect the relative position of each push rod 7 to the operating handle.

[0051] A micro switch 8 can be selected as a position sensor, and each micro switch 8 is set on the side of each push rod 7 facing the operating handle. When the operating handle is moved, the position of the operating handle corresponding to its movement direction will gradually approach the push rod 7 in the movement direction. When the operating handle contacts the micro switch 8, the micro switch 8 is triggered. Alternatively, each micro switch 8 can be set on the operating handle so that each micro switch 8 is directly opposite each push rod 7.

[0052] Alternatively, a first pressure sensor may be used as a position sensor. The first pressure sensor is used to detect the squeezing force between each push rod 7 and the operating handle. Similar to the micro switch 8, the number of first pressure sensors is the same as the number of push rods 7. Each push rod 7 is equipped with a first pressure sensor. Each first pressure sensor can be installed on the side of each push rod 7 facing the operating handle, or each first pressure sensor can be installed on the operating handle so that each first pressure sensor is directly opposite each push rod 7.

[0053] At this time, the control valve 6 can be placed in a normally closed state. After the position sensor detects the direction of the operating handle, the control valve 6 is controlled based on the status information of the working machine. The control valve 6 is in a normally closed state and is switched to an on state only when it is determined that the hydraulically controlled reversing valve 4 is allowed to reverse. This helps to extend the service life of the control valve 6 and reduce the occurrence of solenoid valve failures.

[0054] In other embodiments, the control valve 6 can be placed in a normally open state. When the operating handle is not actuated, the pilot valve's oil outlets 3 are disconnected from the oil inlet 2, and the oil pressure at each hydraulic control port 5 is the same. When the operating handle is actuated, the oil outlet 3 corresponding to the operating handle's direction of movement connects with the pilot valve's oil inlet 2, allowing pilot oil to flow to that outlet 3, increasing the oil pressure at the hydraulic control port 5 connected to that outlet 3. Therefore, by detecting the oil pressure at each hydraulic control port 5, the operating handle's direction of movement can be determined.

[0055] After determining the direction of the operating handle, the control valve 6 is controlled based on the state information of the working machine. If it is determined that the hydraulically controlled reversing valve 4 is allowed to change direction, the control valve 6 is controlled to remain in the connected state; if it is determined that the hydraulically controlled reversing valve 4 is not allowed to change direction, the control valve 6 is controlled to switch to the closed state.

[0056] Specifically, the state detection element includes a second pressure sensor. The number of the second pressure sensors is the same as the number of the hydraulic control ports 5 . A second pressure sensor is configured for each hydraulic control port 5 , and each second pressure sensor is used to detect the oil pressure at each hydraulic control port 5 .

[0057] In this embodiment, the pilot valve body 1 has two pairs of oil outlets 3, each of which is connected to a hydraulically controlled reversing valve 4. One pilot valve can be connected to two hydraulically controlled reversing valves 4. The operating handle can be moved in four directions: forward, backward, left, and right. Moving the handle in one of these directions connects one of the oil outlets 3 to the oil inlet 2.

[0058] At least two pilot valves and control valves 6 are provided, and each control valve 6 is connected to the same pilot oil source. In this way, the hydraulic control device can realize the control of multiple hydraulic control reversing valves 4.

[0059] For a dual-winch crane, the crane has a main winch and an auxiliary winch. The boom's amplitude angle can be adjusted, and the boom can be extended or retracted. Two pilot valves and two control valves 6 can be provided. Both pilot valves have two pairs of oil outlets 3. One pilot valve can be connected to a hydraulically controlled reversing valve 4 for controlling the main winch and a hydraulically controlled reversing valve 4 for controlling the boom's amplitude angle. The other pilot valve can be connected to a hydraulic orifice reversing valve for controlling the auxiliary winch and a hydraulic orifice reversing valve for controlling boom extension or retraction.

[0060] In the embodiment of the present application, an electric proportional control valve can be selected. The state detection element can not only detect the movement direction of the operating handle, but also detect the movement amplitude of the operating handle. The control device generates different electrical signals according to the movement amplitude of the operating handle, thereby controlling the opening of the electric proportional control valve, and realizing precise control of the operating action.

[0061] In another aspect, embodiments of the present application further provide a work machine comprising the hydraulic control device provided in any of the aforementioned embodiments. The hydraulic control devices provided in the aforementioned embodiments have the advantages of simple structure and low cost. Therefore, the work machine provided in this embodiment has the advantages of simple structure, easy maintenance, and low cost. The derivation process for the beneficial effects of the work machine in the embodiments of the present application is generally similar to that for the aforementioned hydraulic control devices, and therefore will not be elaborated upon here.

[0062] In the embodiments of the present application, the type of working machine is not limited, for example, the working machine may be an excavator, a crane, a loader, etc. In other words, as long as the working machine can use the hydraulic control device in the embodiments of the present application, it will be sufficient.

[0063] In another aspect, the present application further provides a control method for a hydraulic control device applied to the above-mentioned working machine. The control method for the hydraulic control device described below can be referred to in conjunction with the hydraulic control device described above.

[0064] As shown in FIG2 and FIG3, the control method of the hydraulic control device provided in the embodiment of the present application includes:

[0065] Step 110: Acquire status information of the operating mechanism and the operating machine.

[0066] Step 120: Determine the motion trend information of the operating machine based on the status information of the operating mechanism.

[0067] Step 130 : Control the on / off state of the oil circuit between the oil inlet of the pilot valve and the pilot oil source according to the motion trend information and the state information of the working machine.

[0068] In the embodiment of the present application, the control valve 6 is an electric proportional control valve, the operating mechanism includes an operating handle, and the state information of the operating mechanism includes at least the movement amplitude of the operating handle. The control method of the hydraulic control device also includes:

[0069] The opening of the electric proportional control valve is controlled according to the movement amplitude of the operating handle.

[0070] The derivation process of the beneficial effects of the control method of the hydraulic control device in the embodiment of the present application is generally similar to the derivation process of the beneficial effects of the above-mentioned hydraulic control device, so it will not be repeated here.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydraulic control device, comprising: A pilot valve, including a pilot valve body and an operating mechanism. The pilot valve body has an oil inlet and at least two oil outlets. The state switching of the operating mechanism is adapted to control the valve position switching of the pilot valve body so that the at least two oil outlets can be selectively communicated with or cut off from the oil inlet. The oil outlet is connected to the hydraulic control port of a hydraulic control valve; A control valve, arranged in the oil circuit between the pilot oil source and the oil inlet. The action of the control valve can control the on-off of the oil circuit; A state detection element, arranged to be able to detect the state information of the operating mechanism; A control device. Both the state detection element and the control valve are electrically connected to the control device. The control device is arranged to be able to control the on-off of the oil circuit according to the state information of the operating mechanism and the state information of the working machine.

2. The hydraulic control device according to claim 1, wherein, The pilot valve body has at least two ejector rods, and the operating mechanism includes an operating handle that can act on each of the ejector rods; The state detection element includes: A position sensor. One position sensor is correspondingly arranged for each ejector rod. The position sensor is arranged to be able to detect the relative position between the ejector rod and the operating handle.

3. The hydraulic control device according to claim 2, wherein, The position sensor includes a microswitch or a first pressure sensor. The microswitch is arranged to be able to abut against the operating handle or the ejector rod, and the first pressure sensor is arranged to be able to detect the extrusion force between the ejector rod and the operating handle.

4. The hydraulic control device according to claim 1, wherein, The state detection element includes: A second pressure sensor. One second pressure sensor is correspondingly arranged for each hydraulic control port. The second pressure sensor is arranged to be able to detect the oil pressure magnitude at the hydraulic control port.

5. The hydraulic control 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 correspondingly connected to one hydraulic control valve.

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

7. The hydraulic control device according to any one of claims 1 to 6, wherein, The control valve is an electro-hydraulic proportional valve.

8. A working machine, including the hydraulic control device according to any one of claims 1-7.

9. A control method for a hydraulic control device, applied to the working machine according to claim 8. The method includes: Obtaining the state information of the operating mechanism and the state information of the working machine; Determining the action trend information of the working machine according to the state information of the operating mechanism; Controlling the on-off state of the oil circuit between the oil inlet of the pilot valve and the pilot oil source according to the action trend information of the working machine and the state information of the working machine.

10. The control method of the hydraulic control device according to claim 9, wherein, The control valve is an electro-hydraulic proportional valve, the operating mechanism includes an operating handle, and the state information of the operating mechanism at least includes the action amplitude of the operating handle. The control method of the hydraulic control device further includes: Controlling the opening degree of the electro-hydraulic proportional valve according to the action amplitude of the operating handle.

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