Reversing control valve group, working machine, and hydraulic system thereof

Abstract

This invention belongs to the field of operating machinery technology and provides a reversing control valve assembly, operating machinery, and its hydraulic system. The reversing control valve assembly has a main oil inlet and a main oil return port, and includes a mechanical reversing coupling and an electrically controlled reversing coupling. The mechanical reversing coupling connects the main oil inlet and the main oil return port. The electrically controlled reversing coupling includes an electrically controlled reversing valve and an electrically controlled switching valve. The oil circuit of the electrically controlled reversing valve connects the main oil inlet and the main oil return port and has multiple electrically controlled working ports. The electrically controlled reversing valve is used to control the connection between some of the electrically controlled working ports and the main oil inlet during reversing, and to control the connection between the remaining ports and the main oil return port. The electrically controlled switching valve is used to control the on / off state of each electrically controlled working port. This valve assembly can realize manual operation and electric control of the attachment. In the electric control mode, it can realize one-button linkage, step execution, and independent intervention of sub-actions for multiple attachment actions. In addition, all electric control functions can be concentrated on one electrically controlled reversing coupling.

Description

Technical Field

[0001] This invention belongs to the field of operating machinery technology, specifically relating to a reversing control valve group, operating machinery and its hydraulic system. Background Technology

[0002] In construction machinery, agricultural machinery, and special-purpose vehicles, the main unit is usually equipped with standardized hydraulic interfaces to connect various attachments. However, existing attachment control valve assemblies are usually composed of multiple mechanical reversing couplings arranged in parallel, and their control modes are relatively simple and fixed, making it difficult to flexibly adapt to the multi-action requirements of certain attachments.

[0003] Taking a reversible plow as an example, its operation requires two actions: "lifting" and "reversing." Current systems typically bind these two functions to two independent reversing couplings, requiring the operation of the corresponding handles on each coupling to achieve the aforementioned actions. This one-to-one control method not only limits the flexibility of the system's functional combinations but also means that in situations requiring continuous and coordinated actions, the operator can only execute them step by step, rather than performing a single-button operation. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies, the present invention provides a reversing control valve group, a working machine and its hydraulic system, which aims to solve the technical problem of the single control mode of existing attachment control valve groups.

[0005] To achieve the above objectives, in one aspect, the present invention provides a reversing control valve assembly, wherein the reversing control valve assembly is provided with a main oil inlet, a main oil return port, and includes a mechanical reversing coupling and an electrically controlled reversing coupling. The mechanical reversing coupling oil circuit connects the main oil inlet and the main oil return port; the electrically controlled reversing coupling includes an electrically controlled reversing valve and an electrically controlled switching valve. The electrically controlled reversing valve oil circuit connects the main oil inlet and the main oil return port and is provided with multiple electrically controlled coupling working ports. The electrically controlled reversing valve is used to control the connection between some of the electrically controlled coupling working ports and the main oil inlet during reversing, and to control the connection between the remaining ports and the main oil return port. The electrically controlled switching valve is used to control the on / off state of each electrically controlled coupling working port.

[0006] In this embodiment, the multiple electrically controlled working ports include multiple first ports and multiple second ports. The first ports and second ports are arranged in pairs. The electrically controlled directional valve is used to control the hydraulic oil from the main inlet port to be directed to one of the first ports and the second ports during directional switching, and to control the hydraulic oil from the other port to flow to the main return port. Each first port and each second port is provided with an electrically controlled switching valve.

[0007] In this embodiment, the electrically controlled switching valve includes a conducting valve position and a shut-off valve position. The shut-off valve position is bidirectional and is the permanent valve position of the electrically controlled switching valve.

[0008] In this embodiment, the mechanical reversing coupling includes a mechanical reversing valve. The mechanical reversing valve has an oil circuit connected to the main oil inlet and the main oil return port and is provided with a third oil port and a fourth oil port arranged in pairs. The mechanical reversing valve is used to control one of the third oil port and the fourth oil port to be connected to the main oil inlet port and to control the other to be connected to the main oil return port during reversal.

[0009] In this embodiment, when the mechanical directional valve is in the neutral position, it forms a neutral position connecting oil passage. One end of the neutral position connecting oil passage is connected to the main oil inlet, and the other end is connected to the electronically controlled directional valve. When the mechanical directional valve is in the neutral position, the electronically controlled directional valve is connected to the main oil inlet through the neutral position connecting oil passage.

[0010] In this embodiment, there are multiple mechanical reversing couplings, which are arranged side by side in sequence. The intermediate position connecting oil passages formed by each mechanical reversing valve in the intermediate position are connected sequentially. The intermediate position connecting oil passage in the first mechanical reversing coupling is connected to the main oil inlet, and the intermediate position connecting oil passage in the last mechanical reversing coupling is connected to the electronically controlled reversing valve.

[0011] In this embodiment, at least one of the mechanical reversing couplings is equipped with a check hydraulic lock on the third or fourth oil port.

[0012] In this embodiment, the mechanical reversing coupling also includes a single- or double-acting switch switching device, and one of the third and fourth oil ports is connected to the main return oil port through the single- or double-acting switch switching device.

[0013] To achieve the above objectives, the present invention also provides a hydraulic system for a working machine, wherein the hydraulic system of the working machine includes a reversing control valve group, a hydraulic pump, and an oil tank as described above, wherein the pump port of the hydraulic pump is connected to the main oil inlet of the reversing control valve group, and the oil tank is connected to the main oil return port of the reversing control valve group.

[0014] To achieve the above objectives, the present invention also provides a working machine, wherein the working machine includes the hydraulic system described above.

[0015] Through the above technical solutions, the reversing control valve assembly provided in the embodiments of the present invention has the following beneficial effects: This valve assembly supports both traditional manual operation in pure mechanical mode and multiple operating modes such as one-button linkage, step-by-step execution, and independent intervention of sub-actions in electronic control mode. All electronic control functions can be concentrated on one electronic control reversing link, without the need to occupy other reversing links or set up more electronic control reversing links. This not only significantly improves the valve assembly's adaptability and operational flexibility to different operating scenarios, but also effectively reduces costs.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a hydraulic schematic diagram of the reversing control valve group in an embodiment of the present invention; Figure 2 This is a hydraulic schematic diagram of the hydraulic system composed of the reversing control valve group according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures P, Main oil inlet; T, Main oil return port; 1, Mechanical reversing coupling; A1, Third oil port; B1, Fourth oil port; 11, Mechanical reversing valve; L, Neutral connecting oil passage; 12, Check hydraulic lock; 13, Double-acting switch; 2, Electrically controlled reversing coupling; 21, Electrically controlled reversing valve; A2, First oil port; B2, Second oil port; 22, Electrically controlled switching valve; 3, Hydraulic pump; 4, Oil tank; 51, Tilting cylinder; 52, Lifting cylinder. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] The reversing control valve assembly of the present invention will now be described with reference to the accompanying drawings.

[0021] This invention provides a reversing control valve assembly, such as Figure 1 and Figure 2 As shown, the reversing control valve group is provided with a main oil inlet P, a main oil return port T, and includes a mechanical reversing link 1 and an electronic reversing link 2.

[0022] The mechanical reversing coupling 1 oil circuit connects the main oil inlet P and the main oil return port T, and is equipped with a mechanical coupling working oil port for reversing control.

[0023] The electrically controlled reversing linkage 2 includes an electrically controlled reversing valve 21 and an electrically controlled switching valve 22. The electrically controlled reversing valve 21 is connected to the main oil inlet P and the main oil return port T in an oil circuit and is provided with multiple electrically controlled linkage working oil ports. The electrically controlled reversing valve 21 is used to control the connection between some of the electrically controlled linkage working oil ports and the main oil inlet P during reversal, and to control the connection between the remaining part and the main oil return port T. The electrically controlled switching valve 22 is used to control the on / off state of each electrically controlled linkage working oil port.

[0024] This valve assembly combines mechanical reversing link 1 with electronic reversing link 2, enabling it to have more operating control modes. Specifically: By connecting the attachment to the mechanical coupling port of the mechanical reversing coupling 1, the operator can manually control the device via a handle or corresponding control device, thus preserving the traditional manual operation habits.

[0025] By connecting the attachment to the working port of the electric control reversing coupling 2, the operator can achieve one-button control of the attachment's movement simply by pressing the corresponding button according to the preset electric control logic.

[0026] Meanwhile, the multiple electrically controlled working ports allow all electrical control functions to be concentrated on the electrically controlled directional control coupling 2, eliminating the need to occupy other directional control couplings or set up more electrically controlled directional control couplings 2. In other words, based on the traditional mechanical directional control coupling 1, this valve group only needs to add one electrically controlled directional control coupling 2 to enable the system to have complete multi-action automated electrical control capabilities, significantly reducing the complexity and manufacturing cost of the valve group and effectively freeing up the resources occupied by other directional control couplings. During operation, by controlling the electrically controlled directional control valve 21 to switch the valve position, some electrically controlled working ports are connected to the main inlet port P, and the rest are connected to the main return port T, thereby controlling the overall output direction of the attachment; while the electrically controlled switching valve 22 independently controls the start and stop of each sub-action. In this way, the operator only needs to press the corresponding control button, and the system can switch the state of the electrically controlled directional control valve 21 and each electrically controlled switching valve 22 according to the preset logic sequence corresponding to the button, thereby realizing the automatic execution of multiple actions of the attachment.

[0027] In summary, this valve assembly supports both traditional manual operation in pure mechanical mode and multiple operating modes such as one-button linkage, step-by-step execution, and independent intervention of sub-actions in electronic control mode. Furthermore, all electronic control functions can be concentrated on one electronic control reversing link 2, without the need to occupy other reversing links or set up more electronic control reversing links 2. This not only significantly improves the valve assembly's adaptability and operational flexibility to different operating scenarios, but also effectively reduces costs.

[0028] like Figure 1 and Figure 2 As shown, in this embodiment, the multiple electrically controlled working ports include multiple first ports A2 and multiple second ports B2. The first ports A2 and the second ports B2 are arranged in pairs. The electrically controlled directional valve 21 is used to control the hydraulic oil from the main inlet port P to be directed to one of the first ports A2 and the second ports B2 during directional switching, and to control the hydraulic oil from the other port to flow to the main return port T.

[0029] The drive unit typically includes two ports (such as the rodless chamber and rod chamber ports of a hydraulic cylinder), and divides multiple electrically controlled working ports into a pair of first port A2 and second port B2, thereby facilitating the connection of the drive unit.

[0030] It is understandable that, in order to facilitate the distinction between the first oil port A2 and the second oil port B2, the first oil ports A2 of each pair are ordered as A2.1, A2.2, etc., and the second oil ports B2 of each pair are ordered as B2.1, B2.2, etc.

[0031] like Figure 1 and Figure 2 As shown, in this embodiment, the electrically controlled switching valve 22 can be a two-position reversing cartridge valve, a two-position connecting valve, or a reversing valve that controls the on / off state of only one oil port. For this type of reversing valve, an electrically controlled switching valve 22 needs to be provided on each of the first oil port A2 and each of the second oil ports B2.

[0032] The electrically controlled directional valve 21 is responsible for switching the flow direction of the main inlet port P, directing it to either the first port A2 or the second port B2. Simultaneously, it directs the hydraulic oil from the other port to the main return port T, thus controlling the overall output direction of the attachment. By configuring an independent electrically controlled switching valve 22 for each port, each valve can independently control the on / off state of its corresponding port, thereby achieving precise start / stop of the oil inlet and return states for each actuator. During attachment installation, simply connect the attachment's actuator unit to the corresponding port according to the operational requirements. The attachment can then perform complex controls such as sequential execution of multiple actions, synchronous linkage of multiple actions, or mid-action intervention through a preset program.

[0033] In addition, this valve assembly integrates all electronic control functions into a single reversing link, eliminating the need to occupy additional reversing link resources. This significantly reduces valve assembly costs and space requirements while greatly enhancing the system's control capabilities and programming flexibility for complex actions involving multiple attributes.

[0034] In this embodiment, the electrically controlled switching valve 22 can also be a multi-position multi-way directional valve with multiple oil port on / off control functions. For example, the on / off of the two first oil ports A2 can be controlled by a three-position three-way directional valve.

[0035] In this embodiment, the electrically controlled switching valve 22 includes a conducting valve position and a shut-off valve position. The shut-off valve position is bidirectional and is the permanent valve position of the electrically controlled switching valve 22.

[0036] In its default state, the electrically controlled switching valve 22 remains bidirectionally closed, with the corresponding electrically controlled working port and the valve core of the electrically controlled directional valve in a bidirectional cut-off state. This bidirectional closure reliably locks the actuator connected to this port in its current position, effectively preventing unexpected actions such as actuator drift and settling caused by internal leakage of the valve core or external disturbances, significantly improving the accuracy and safety of the attachment's operation. When the electrically controlled switching valve 22 is energized and switched to the open position, the oil circuit can then execute the corresponding action according to the flow direction set by the electrically controlled directional valve 21. This allows for independent and precise start-stop scheduling of each actuator, based on the centralized control of the overall direction by the electrically controlled directional valve 21. Furthermore, the design of the permanently closed position also facilitates system power failure protection. In the event of an unexpected power failure, all electrically controlled switching valves 22 automatically reset to the closed position, and each actuator immediately stops and locks, avoiding equipment damage or safety accidents that may be caused by uncontrolled actions, further improving the reliability of the overall machine operation.

[0037] like Figure 1 and Figure 2 As shown, in this embodiment, the mechanical reversing link 1 includes a mechanical reversing valve 11. The mechanical reversing valve 11 is connected to the main oil inlet P and the main oil return port T and is provided with a third oil port A1 and a fourth oil port B1 arranged in pairs. The mechanical reversing valve 11 is used to control one of the third oil port A1 and the fourth oil port B1 to be connected to the main oil inlet P and to control the other to be connected to the main oil return port T during reversal.

[0038] The mechanical directional valve 11 can be directly driven by a handle or associated mechanism, without the need for electronic intervention. It offers direct response and reliable operation, fully preserving the operating feel and habits of traditional hydraulic systems. The mechanical directional valve 11 has a mature structure and low manufacturing cost, does not rely on electronic components, and can operate stably under harsh conditions such as high temperature, high humidity, strong vibration, or electromagnetic interference. This valve assembly arranges the mechanical directional valve 1 and the electronic directional valve 2 in parallel within the assembly, retaining both manual control and one-button automatic control functions, thus greatly enriching the valve assembly's operating modes.

[0039] like Figure 1 and Figure 2 As shown, in this embodiment, when the mechanical directional valve 11 is in the neutral position, it forms a neutral position connecting oil passage L. One end of the neutral position connecting oil passage L is connected to the main oil inlet P, and the other end is connected to the electronically controlled directional valve 21. When the mechanical directional valve 11 is in the neutral position, the electronically controlled directional valve 21 is connected to the main oil inlet P through the neutral position connecting oil passage L.

[0040] When the mechanical directional valve 11 is in the neutral position, it forms a neutral position connecting oil passage L. One end of this oil passage is connected to the main oil inlet P, and the other end is connected to the oil inlet of the electrically controlled directional valve 21. When the mechanical directional valve 11 is in the neutral position, the high-pressure oil from the main oil inlet P is directly introduced into the electrically controlled directional valve 21 through the neutral position connecting oil passage L, so that the electrically controlled directional valve 21 obtains pressure oil and operates normally. When the mechanical directional valve 11 deviates from the neutral position and switches to the upper or lower position, its internal valve core cuts off the neutral position connecting oil passage L. At this time, all the hydraulic oil from the main oil inlet P is supplied to the actuator connected to the mechanical directional valve 11, and no more oil is supplied to the electrically controlled directional valve 21.

[0041] This valve assembly directly connects to the electrically controlled directional valve 21 via the neutral position oil passage L of the mechanical directional valve 11. Oil supply and distribution are completed solely through the cast oil passages within the valve body, resulting in a highly integrated structure that significantly simplifies external pipeline connections. Simultaneously, when the mechanical directional valve 11 is in the neutral position, the electrically controlled directional valve 21 operates normally, with the actuator driven in electrically controlled mode. Once the operator pushes the mechanical handle to disengage the mechanical directional valve 11 from the neutral position, the main oil circuit automatically switches to mechanical connection, and the electrically controlled directional valve 21 stops operating due to loss of pressurized oil. This characteristic naturally establishes a safety logic of "manual intervention takes precedence over electrical control." Any mechanical operation will automatically cut off the oil supply to the electrically controlled valve, preventing simultaneous output of conflicting commands from both valves and actuators, eliminating the need for additional electrical interlocks or program checks, and significantly improving the reliability and safety of the control system.

[0042] like Figure 1 and Figure 2 As shown, in this embodiment, when the electrically controlled directional valve 21 is in the neutral position, its port connected to the neutral position communication oil passage L is connected to the main return oil port T. Specifically, when the mechanical directional valve 11 is in the neutral position, the pressure oil from the main inlet P is supplied to the electrically controlled directional valve 21 through the neutral position communication oil passage L; if the electrically controlled directional valve 21 is also in the neutral position, the pressure oil is unloaded and returned to the main return oil port T through the internal channel of the valve core of the electrically controlled directional valve 21, so that the system operates under low pressure standby. When the mechanical directional valve 11 is switched off from the neutral position for manual operation, the neutral position communication oil passage L is cut off, and the flow of the main inlet P is entirely supplied to the mechanical directional valve 1, and the electrically controlled directional valve 21 loses its pressure oil source and stops working.

[0043] In this embodiment, there are multiple mechanical reversing couplings 1, which are arranged side by side in sequence. The intermediate connection oil passages L formed by each mechanical reversing valve 11 when in the intermediate position are connected one after the other in sequence. The intermediate connection oil passage L in the first mechanical reversing coupling 1 is connected to the main oil inlet P, and the intermediate connection oil passage L in the last mechanical reversing coupling 1 is connected to the electronically controlled reversing valve 21.

[0044] This valve assembly uses a series connection of the central connecting oil passages L, allowing the main inlet P to connect only to the first mechanical directional valve 1. The oil is then transmitted step-by-step through the central connecting oil passages L, ultimately supplying pressurized oil to the electrically controlled directional valve 21 connected to the last valve. The entire oil supply channel is fully integrated within the series oil passages of the valve body, eliminating the need for additional branch lines or external pipelines, significantly simplifying the valve body structure and system layout.

[0045] Understandably, in order to facilitate the distinction between the third oil port A1 and the fourth oil port B1, the third oil ports A1 of each section are ordered as A1.1, A1.2, etc., and the fourth oil ports B1 of each section are ordered as B1.1, B1.2, etc.

[0046] In this embodiment, the multiple mechanical reversing valves 1 arranged side by side also form a pressurized oil inlet passage and a return oil passage connected in sequence. The pressurized oil inlet passage is connected to the main oil inlet P, and the return oil passage is connected to the main return oil outlet T. Each mechanical reversing valve 11 is connected to both the pressurized oil inlet passage and the return oil passage, and the electrically controlled reversing valve 21 is connected to the main return oil outlet T through the return oil passage.

[0047] The pressure oil inlet passage is directly connected to each mechanical directional valve 11, allowing each mechanical directional valve 11 to independently obtain pressure oil from the main inlet port P without interference, supporting parallel control of different attachment actions by multiple valves simultaneously. The return oil passage collects the return oil from each valve and directs it to the main return oil port T. Meanwhile, the intermediate connecting oil passage L serves a dedicated function of supplying oil to the electrically controlled directional valve 21 in series. Both functions are independent and do not conflict. This dual-oil circuit architecture allows the multi-operation mechanical valves to retain the ability of traditional parallel valve groups to perform multiple actions in parallel, while also providing an independent and controllable oil supply channel for the electrically controlled valves, significantly improving the system's adaptability in multi-attachment and multi-mode operation scenarios.

[0048] In this embodiment, at least one of the mechanical reversing couplings 1 is also provided with a check hydraulic lock 12 on the third oil port A1 or the fourth oil port B1.

[0049] By setting a check hydraulic lock 12, the actuator can be effectively prevented from settling or drifting unexpectedly due to internal leakage of the valve core of the mechanical directional valve 11 or external load disturbance. This significantly improves the positioning accuracy and operational safety of the attachment in the stopped, standby and neutral states. It is especially suitable for working conditions with strict requirements for locking reliability, such as lifting, grabbing and high-altitude operations.

[0050] It is understood that in this embodiment, the check hydraulic lock 12 is linked with the valve core of the mechanical directional valve 11. When the valve core moves to the neutral position, the check hydraulic lock 12 is closed, and when the valve core moves to the working valve position, the check hydraulic lock 12 is opened.

[0051] In this embodiment, the mechanical reversing linkage 1 also includes a single- or double-acting switch switching device 13, and one of the third oil port A1 and the fourth oil port B1 is connected to the main return oil port T through the single- or double-acting switch switching device 13.

[0052] When the third port A1 and the fourth port B1 are connected to a double-acting hydraulic cylinder, the switching device can be turned off. In this case, the oil inlet and outlet of the third port A1 and the fourth port B1 are controlled by the switching of their respective mechanical directional valves 11. When the third port A1 and the fourth port B1 are connected to a single-acting hydraulic cylinder or a cylinder with spring return, the switching device can be turned on. In this case, the oil inlet and outlet of one port are controlled by the switching of the mechanical directional valve 11, while the other port is always connected to the main return port T.

[0053] like Figure 2As shown, to achieve the above objectives, the present invention also provides a hydraulic system for a working machine, wherein the hydraulic system of the working machine includes a reversing control valve group, a hydraulic pump 3, and an oil tank 4 as described above. The pump port of the hydraulic pump 3 is connected to the main oil inlet P of the reversing control valve group, and the oil tank 4 is connected to the main oil return port T of the reversing control valve group. Since the hydraulic system adopts all the technical solutions of the above embodiments, it has at least the beneficial effects brought by the above embodiments, which will not be repeated here.

[0054] In this embodiment, the hydraulic pump 3 can be a fixed displacement pump. Fixed displacement pumps are low in cost and highly reliable, and can work reliably and stably for a long time under harsh working conditions.

[0055] In this embodiment, filter elements can also be installed between the hydraulic pump 3 and the valve group, and between the oil tank 4 and the valve group. The filter elements can filter impurities in the oil to ensure the cleanliness of the oil.

[0056] For ease of understanding, the working principle of the reversing control valve group of the present invention will be explained below in conjunction with the specific application scenario of the system.

[0057] Hydraulic reversible plows require frequent execution of a series of "lifting-tilting-lowering" actions during operation. Traditional solutions require two mechanical valves to control the lifting cylinder 52 and the tilting cylinder 51 of the reversible plow separately. The operator must pull two handles sequentially, and the coordination of these actions relies on manual experience, resulting in low efficiency and a high risk of errors.

[0058] In this valve assembly, such as Figure 2 As shown, the lifting cylinder 52 and the tilting cylinder 51 of the reversible plow can be connected to two different pairs of electrical control ports in the tail-mounted electrical control reversing coupling 2 (e.g., connect one pair of electrical control ports A2.1 / B2.1 to the tilting cylinder 51, and the other pair of electrical control ports A2.2 / B2.2 to the lifting cylinder 52). Through corresponding control, the lifting, tilting, floating, and neutral functions of the reversible plow can be realized. The correspondence between the actions of the reversible plow and the states of each valve is shown in the table below:

[0059] Among them, DT1 and DT2 are the two electromagnetic control terminals of the electrically controlled directional valve 21, DT3 and DT4 are the electromagnetic control terminals of the corresponding electrically controlled switching valve 22 on A2.1 / B2.1, and DT5 and DT6 are the electromagnetic control terminals of the corresponding electrically controlled switching valve 22 on A2.2 / B2.2.

[0060] To achieve the above objectives, the present invention also provides a working machine, wherein the working machine includes the hydraulic system described above. Since the working machine adopts all the technical solutions of the above embodiments, it at least possesses the beneficial effects brought about by the above embodiments, and will not be repeated here.

[0061] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative 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 combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0064] Although embodiments of the present invention have been described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A reversing control valve group, characterized by comprising: The reversing control valve assembly is provided with a main oil inlet (P) and a main oil return port (T) and includes: Mechanical reversing coupling (1), with the oil circuit connecting the main oil inlet (P) and the main oil return port (T); The electrically controlled reversing coupling (2) includes an electrically controlled reversing valve (21) and an electrically controlled switching valve (22). The electrically controlled reversing valve (21) is connected to the main oil inlet (P) and the main oil return port (T) and has multiple electrically controlled working oil ports. The electrically controlled reversing valve (21) is used to control some of the electrically controlled working oil ports to be connected to the main oil inlet (P) during reversal, and to control the remaining electrically controlled working oil ports to be connected to the main oil return port (T). The electrically controlled switching valve (22) is used to control the on / off state of each of the electrically controlled working oil ports.

2. The reversing control valve assembly according to claim 1, characterized in that, Multiple electrically controlled working ports include multiple first ports (A2) and multiple second ports (B2). The first ports (A2) and the second ports (B2) are arranged in pairs. The electrically controlled directional valve (21) is used to control the hydraulic oil of the main inlet port (P) to be directed to one of the first ports (A2) and the second ports (B2) during directional switching, and to control the hydraulic oil of the other port to flow to the main return port (T). Each of the first ports (A2) and each of the second ports (B2) is provided with an electrically controlled switching valve (22).

3. The reversing control valve assembly according to claim 2, characterized in that, The electrically controlled switch valve (22) includes a conducting valve position and a shut-off valve position. The shut-off valve position is bidirectional and is the permanent valve position of the electrically controlled switch valve (22).

4. The reversing control valve assembly according to any one of claims 1 to 3, characterized in that, The mechanical reversing coupling (1) includes a mechanical reversing valve (11). The mechanical reversing valve (11) is connected to the main oil inlet (P) and the main oil return port (T) and is provided with a third oil port (A1) and a fourth oil port (B1) in pairs. The mechanical reversing valve (11) is used to control one of the third oil port (A1) and the fourth oil port (B1) to be connected to the main oil inlet (P) and to control the other to be connected to the main oil return port (T) during reversal.

5. The reversing control valve assembly according to claim 4, characterized in that, When the mechanical directional valve (11) is in the neutral position, it forms a neutral position connecting oil passage (L). One end of the neutral position connecting oil passage (L) is connected to the main oil inlet (P), and the other end is connected to the electronically controlled directional valve (21). When the mechanical directional valve (11) is in the neutral position, the electronically controlled directional valve (21) is connected to the main oil inlet (P) through the neutral position connecting oil passage (L).

6. The reversing control valve assembly according to claim 5, characterized in that, The number of mechanical reversing couplers (1) is multiple, and the multiple mechanical reversing couplers (1) are arranged side by side in sequence. The intermediate connecting oil passages (L) formed by each mechanical reversing valve (11) when in the intermediate position are connected first and second in sequence. The intermediate connecting oil passage (L) in the first mechanical reversing coupler (1) is connected to the main oil inlet (P), and the intermediate connecting oil passage (L) in the last mechanical reversing coupler (1) is connected to the electronically controlled reversing valve (21).

7. The reversing control valve assembly according to claim 6, characterized in that, At least one of the mechanical reversing couplings (1) is provided with a check hydraulic lock (12) on the third oil port (A1) or the fourth oil port (B1).

8. The reversing control valve assembly according to claim 4, characterized in that, The mechanical reversing coupling (1) also includes a single- or double-acting switch (13), and one of the third oil port (A1) and the fourth oil port (B1) is connected to the main return oil port (T) through the single- or double-acting switch (13).

9. A hydraulic system for a work-operating machine, characterized in that, The hydraulic system of the operating machinery includes: The reversing control valve assembly according to any one of claims 1 to 8; Hydraulic pump (3), the pump port of the hydraulic pump (3) is connected to the main inlet (P) of the reversing control valve group; The oil tank (4) is connected to the main return port (T) of the reversing control valve group.

10. A type of operating machinery, characterized in that, The hydraulic system of the working machinery as described in claim 9.

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