Emergency control valve group, hydraulic system with emergency function, and working machine

Abstract

The utility model belongs to operation machinery technical field and provide a kind of emergency control valve group, hydraulic system with emergency function and operation machinery, emergency control valve group is equipped with emergency external oil port, emergency steering control port and emergency work control port, emergency control valve group includes emergency reversing valve, emergency reversing valve is equipped with oil inlet, first work oil port, second work oil port, oil inlet is communicated with emergency external oil port, first work oil port is communicated with emergency steering control port, second work oil port is communicated with emergency work control port, emergency reversing valve is used to select the hydraulic oil of oil inlet and guide to one of first work oil port and second work oil port.The valve group can be compatible with the emergency steering function of different architecture system and the emergency work function of work device, and the versatility is strong, the refitting threshold and the refitting cost are very low.

Description

Technical Field

[0001] This utility model belongs to the field of work machinery technology, specifically relating to an emergency control valve group, a hydraulic system with emergency function, and work machinery. Background Technology

[0002] Wide-body dump trucks, mining trucks, and other off-highway work machinery operate under extremely harsh conditions year-round, placing extremely stringent demands on system reliability. To address potential failures in the main propulsion system, emergency hydraulic modules must be installed to ensure that the vehicle can still perform basic operations such as steering and obstacle avoidance in emergency situations, thus guaranteeing operational safety.

[0003] Currently, conventional emergency hydraulic modules mainly consist of a single emergency pump. However, the installation methods differ depending on whether the system architecture is split-type or combined-flow type. In split-type systems, because the steering circuit and the working device circuit are independent, and steering priority must be ensured in emergency situations, a single emergency pump can only guarantee the system's emergency steering function during retrofitting. In combined-flow systems, the steering circuit and the working device circuit share the main hydraulic circuit. Although such systems can achieve emergency operation of steering and the working device based on a single pump, the issues of load-flow matching and steering priority necessitate that the emergency pump rely on a high-value variable frequency motor drive, resulting in high costs.

[0004] It is evident that, regardless of whether it is a separate or combined flow architecture, the existing solutions, when using only a single pump, cannot balance functional completeness with economical retrofitting. Utility Model Content

[0005] To address the aforementioned deficiencies or shortcomings, this utility model provides an emergency control valve assembly, a hydraulic system with emergency functions, and operating machinery, aiming to solve the technical problem that existing hydraulic system emergency modifications cannot simultaneously achieve full functionality and reduce modification costs by simply adding a single pump.

[0006] To achieve the above objectives, this utility model provides an emergency control valve assembly for controlling the emergency steering and emergency operation of the working device of a machine. The emergency control valve assembly is provided with an emergency external oil port, an emergency steering control port, and an emergency operation control port. The emergency control valve assembly includes an emergency reversing valve, which is provided with an oil inlet, a first working oil port, and a second working oil port. The oil inlet is connected to the emergency external oil port, the first working oil port is connected to the emergency steering control port, and the second working oil port is connected to the emergency operation control port. The emergency reversing valve is used to selectively guide the hydraulic oil from the oil inlet to one of the first working oil port and the second working oil port.

[0007] In this embodiment, the emergency control valve group is also provided with a steering master oil interface, which is used to connect to the pump port of the main steering pump. The emergency control valve group also includes a shuttle valve, the first pressure tap of the shuttle valve is connected to the first working oil port, the second pressure tap of the shuttle valve is connected to the steering master oil interface, and the output port of the shuttle valve is connected to the emergency steering control port.

[0008] In this embodiment, the emergency control valve group is also provided with a pressure relief port, and the emergency directional valve is also provided with a return port. The return port is connected to the pressure relief port. The emergency directional valve is used to control the connection between the second working port and the return port when the hydraulic oil from the emergency external oil port flows to the first working oil port.

[0009] In this embodiment, the emergency control valve assembly also includes a hydraulically controlled check valve. The hydraulically controlled check valve is disposed between the second working port and the emergency working control port. The hydraulically controlled end of the hydraulically controlled check valve is hydraulically connected to the first working port. The hydraulically controlled check valve is configured to open when hydraulic oil flows from the second working port to the emergency working control port and close in the reverse direction. The hydraulically controlled end is used to control the reverse opening of the hydraulically controlled check valve.

[0010] In this embodiment, the emergency control valve assembly is also provided with an oil source inlet and an oil source outlet, and the oil source inlet and the oil source outlet are connected.

[0011] To achieve the above objectives, this utility model also provides a hydraulic system with an emergency function. The hydraulic system with the emergency function includes a steering control circuit, a working device control circuit, a main power unit, and an emergency control valve assembly as described above. The steering control circuit includes a steering control valve and a steering cylinder. The steering control valve controls the direction of movement of the steering cylinder. The working device control circuit includes a working control valve and a working cylinder. The main power unit includes a main steering pump for supplying oil to the steering control valve and a main working pump for supplying oil to the working control valve. The emergency steering control port is connected to the steering control valve, and the emergency working control port can be connected to the pressure oil inlet of the working cylinder or the working control valve.

[0012] In this embodiment, the emergency control valve group is also provided with a steering master oil interface, the pump port of the main steering pump is connected to the steering master oil interface, the emergency control valve group also includes a shuttle valve, the first pressure tap of the shuttle valve is connected to the first working oil port, the second pressure tap of the shuttle valve is connected to the steering master oil interface, and the output port of the shuttle valve is connected to the emergency steering control port.

[0013] In this embodiment, the emergency working control port is connected to the working cylinder, the emergency control valve group is also provided with a pressure relief port, and the emergency reversing valve is also provided with a return port. The return port is connected to the pressure relief port. The emergency reversing valve is used to control the second working port to connect with the return port when the hydraulic oil from the emergency external oil port flows to the first working oil port.

[0014] In this embodiment, the emergency control valve assembly also includes a hydraulically controlled check valve. The hydraulically controlled check valve is disposed between the second working port and the emergency working control port. The hydraulically controlled end of the hydraulically controlled check valve is hydraulically connected to the first working port. The hydraulically controlled check valve is configured to open when hydraulic oil flows from the second working port to the emergency working control port and close in the reverse direction. The hydraulically controlled end is used to control the reverse opening of the hydraulically controlled check valve.

[0015] To achieve the above objectives, this utility model also provides a working machine, wherein the working machine includes a hydraulic system with emergency function as described above.

[0016] Through the above technical solution, the emergency control valve assembly provided by this utility model embodiment has the following beneficial effects: This valve assembly, with its standardized interface design, can accommodate emergency functions for both split and combined flow systems. During modification, simply connect the emergency steering control port to the steering control circuit, the emergency working control port to the working device control circuit, and connect an emergency power source to the emergency external oil port. By switching the emergency directional valve to the appropriate position, the system's emergency steering function and the working device's emergency working function can be switched. This modification method requires no major alterations to the original valve assembly or connection architecture, offering strong versatility and making it suitable for different brands and models of both new and old vehicles. The modification threshold and cost are very low. Furthermore, after modification, users do not need to configure a separate power source for each device; a minimum of one emergency power source is required to adapt to the emergency operation of multiple machines in rotation, significantly reducing purchase costs.

[0017] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a hydraulic schematic diagram of the emergency control valve group according to an embodiment of this utility model; Figure 2 This is a hydraulic schematic diagram of a hydraulic system with emergency function according to an embodiment of the present utility model.

[0019] Explanation of reference numerals in the attached figures 11. Emergency directional valve; 12. Shuttle valve; 13. Hydraulic check valve; 14. Relief valve; P1. Emergency external oil port; A1. Emergency steering control port; B1. Emergency working control port; BP. Steering master oil port; P2. Oil inlet; A2. First working oil port; B2. Second working oil port; T1. Pressure relief port; T2. Oil return port; X1. Oil source inlet; X2. Oil source outlet; 21. Steering control valve; 22. Steering cylinder; 23. Steering gear; 31. Working control valve; 32. Working cylinder; 41. Main steering pump; 42. Main working pump; 51. Priority valve; 52. Pneumatic directional valve; 6. Emergency power source; 7. Oil tank. Detailed Implementation

[0020] The specific embodiments of this utility model 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 scope of this utility model.

[0021] The emergency control valve assembly of this utility model is described below with reference to the accompanying drawings.

[0022] This utility model discloses an emergency control valve assembly, such as Figure 1 and Figure 2 As shown, the valve assembly is used to control the emergency steering of the operating machinery and the emergency operation of the working device. The valve assembly includes a valve body and several functional valve cores integrated within the valve body.

[0023] The valve body surface is provided with an emergency external oil port P1, an emergency steering control port A1, and an emergency working control port B1 for external connection. The emergency external oil port P1 is a plug-type interface. When the emergency function is required, an emergency power source 6 can be connected to the emergency external oil port P1. When the emergency function is not required, the emergency external oil port P1 can be blocked with a plug.

[0024] The valve core includes at least a directional valve core, which, together with the valve body, forms an emergency directional valve 11. Near the directional valve core, the valve body also contains an inlet P2, a first working port A2, and a second working port B2. The inlet P2 is connected to an emergency external port P1, the first working port A2 is connected to an emergency steering control port A1, and the second working port B2 is connected to an emergency working control port B1. By controlling the movement of the directional valve core, the inlet P2 can be controlled to selectively connect either the first working port A2 or the second working port B2.

[0025] This valve assembly, with its standardized interface design, can accommodate emergency functions for both split and combined flow systems. During modification, simply connect the emergency steering control port A1 to the steering control circuit, the emergency working control port B1 to the working device control circuit, and connect an emergency power source 6 to the emergency external oil port P1. By switching the emergency reversing valve 11 to the appropriate position, the system's emergency steering function and the working device's emergency working function can be switched. This modification method requires no major alterations to the original valve assembly or connection architecture, offering strong versatility and making it suitable for different brands and models of both new and old vehicles. The modification threshold and cost are very low. Furthermore, after modification, users do not need to configure a separate power source for each device; a minimum of one emergency power source 6 is required to adapt to the emergency operation of multiple machines in rotation, significantly saving on purchase costs.

[0026] like Figure 1 and Figure 2 As shown, in this embodiment, the steering control circuit generally includes a steering control valve 21 and a steering cylinder 22, with the working oil port of the steering control valve 21 connected to the steering cylinder 22. Since the steering control valve 21 is generally linked with the steering gear 23, in order to reduce modifications to the original circuit and ensure normal steering function, the emergency steering control port A1 is preferably connected to the pressure oil inlet of the steering control valve 21.

[0027] like Figure 1 and Figure 2 As shown, in this embodiment, the valve body of the emergency control valve assembly is also equipped with a main steering oil interface BP, which is used to connect to the pump port of the main steering pump 41. A shuttle valve 12 can also be integrated into the valve body of the emergency control valve assembly. The shuttle valve 12 is located between the main steering oil interface BP and the first working oil port A2. The first pressure tap of the shuttle valve 12 is connected to the first working oil port A2, the second pressure tap of the shuttle valve 12 is connected to the main steering oil interface BP, and the output port of the shuttle valve 12 is connected to the emergency steering control port A1. By setting the shuttle valve 12, the switching between main steering and emergency steering can be achieved without changing the original number of interfaces on the steering control valve 21, while ensuring the oil circuit isolation between the two.

[0028] Specifically, such as Figure 1 and Figure 2 As shown, when the main steering pump 41 is working normally and the emergency external oil port P1 is blocked by the plug, the valve core of the shuttle valve 12 will adaptively switch to a state where the second pressure tap is connected to the emergency steering control port A1 and the first pressure tap is closed (i.e., Figure 1 (Left position in the middle), at this time, the hydraulic oil output by the main steering pump 41 will flow to the steering control valve 21 after passing through the shuttle valve 12. The first pressure tap is cut off to prevent the oil output by the main steering pump 41 from flowing back to the first working oil port A2, which would affect the operation of the emergency reversing valve 11.

[0029] When the main steering pump 41 stops, the emergency external oil port P1 is connected to the emergency power source 6, and the emergency reversing valve 11 is switched to the emergency steering control valve position, the valve core of the shuttle valve 12 will move to a state where the first pressure tap is connected to the emergency steering control port A1, and the second pressure tap is closed. Figure 1 (Right position in the middle), at this time, the hydraulic oil output by the emergency power source 6 flows through the shuttle valve 12 and then flows to the steering control valve 21. The second pressure tap is cut off to prevent the oil output by the emergency power source 6 from flowing back into the main steering pump 41 and causing damage to the main steering pump 41.

[0030] In this embodiment, by setting the shuttle valve 12, isolation can be achieved between the main steering pump 41 and the emergency reversing valve 11, so as to avoid the other from being affected when one is working alone.

[0031] like Figure 1 and Figure 2 As shown, in this embodiment, the valve body of the emergency control valve group is also provided with a pressure relief port T1, and the emergency reversing valve 11 is also provided with a return port T2. The return port T2 is connected to the pressure relief port T1. The emergency reversing valve 11 is used to control the second working port B2 to be connected to the return port T2 when the hydraulic oil from the emergency external oil port P1 flows to the first working oil port A2.

[0032] The emergency directional valve 11 may include an emergency steering control valve position where the emergency external oil port P1 is connected to the first working oil port A2, and an emergency working control valve position where the emergency external oil port P1 is connected to the second working oil port B2.

[0033] When the emergency control valve is switched to the emergency steering control valve position, the emergency directional valve 11 is configured to connect the emergency external oil port P1 and the first working oil port A2, as well as the second working oil port B2 and the return oil port T2. At this time, while the system is performing emergency steering, the working oil cylinder 32 can also unload oil through the second working oil port B2 to achieve the effect of automatic reset of the working device. Especially for the lifting cylinder, when the system needs to activate the emergency steering function, the lifting cylinder can automatically reset under the drive of the load. This can prevent the boom or cargo box driven by the lifting cylinder from being in a lifted state when the machine is moving, which could lead to a collision and ensure safe driving afterwards.

[0034] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, the emergency control valve group also includes a hydraulically controlled check valve 13. The hydraulically controlled check valve 13 is disposed between the second working port B2 and the emergency working control port B1. The hydraulically controlled end of the hydraulically controlled check valve 13 is hydraulically connected to the first working port A2. The hydraulically controlled check valve 13 is configured to conduct when hydraulic oil flows from the second working port B2 to the emergency working control port B1 and to cut off in the reverse direction. The hydraulically controlled end is used to control the reverse conduction of the hydraulically controlled check valve 13.

[0035] When the emergency control valve switches to the emergency steering control valve position, the pressure oil from the emergency power source 6 flows to the first working port A2 and drives the hydraulic check valve 13 to open in the reverse direction. At this time, the working device can smoothly return oil through the second port, realizing the linkage between emergency steering and the reset of the working device. When the emergency control valve switches to the emergency working control valve position, the pressure oil from the emergency power source 6 flows to the second working port B2 to drive the working device. During this process, the first working port A2 is at low pressure, and the reverse conduction function of the hydraulic check valve 13 is closed to prevent the oil in the working cylinder 32 from flowing back to the second working port B2.

[0036] like Figure 1 and Figure 2 As shown, in this embodiment, the emergency control valve is also provided with a neutral position. The neutral position is configured such that both the first working oil port A2 and the second working oil port B2 are connected to the return oil port T2. By setting the neutral position, the emergency steering and emergency working functions of the working device can be shut off.

[0037] like Figure 1 and Figure 2 As shown, in this embodiment, the emergency control valve group also includes an overflow valve 14, which is located between the emergency external oil port P1 and the pressure relief port T1. By setting the overflow valve 14, the maximum working pressure of the emergency power source 6 can be limited.

[0038] like Figure 1 and Figure 2 As shown, in this embodiment, the emergency power source 6 can be an emergency pump. The valve body of the emergency control valve group is also provided with an oil source inlet X1 and an oil source outlet X2, which are connected. The oil source inlet X1 can be connected to the oil tank 7 of the working machinery, and the oil source outlet X2 can be connected to the oil suction port of the emergency pump. In this way, the emergency control valve group can use the original oil in the working machinery to achieve emergency control without the need for external oil to mix in, thus ensuring the purity of the original oil in the system.

[0039] To achieve the above objectives, such as Figure 1 and Figure 2 As shown, this utility model also provides a hydraulic system with emergency function, wherein the hydraulic system with emergency function includes a main hydraulic module and an emergency hydraulic module.

[0040] The main hydraulic module includes a steering control circuit, a working device control circuit, and a main power unit.

[0041] The steering control circuit includes a steering control valve 21 and a steering cylinder 22. The steering control valve 21 is used to control the direction and speed of movement of the steering cylinder 22 according to the action of the steering gear 23.

[0042] The working device control circuit includes a working control valve 31 and a working cylinder 32. The working control valve 31 is used to control the movement direction of the working cylinder 32.

[0043] The main power unit includes a main steering pump 41 for supplying oil to the steering control valve 21 and a main working pump 42 for supplying oil to the working control valve 31.

[0044] The emergency hydraulic module includes an emergency control valve group. The emergency steering control port A1 in the emergency control valve group is connected to the steering control valve 21, and the emergency working control port B1 is connected to the pressure oil inlet of the working cylinder 32 or the working control valve 31.

[0045] This system can be adapted for both split-type and combined-type architectures with its emergency control valve assembly. During installation, simply connect the emergency steering control port A1 to the pressure oil inlet of the steering control valve 21, and the emergency working control port B1 to the pressure oil inlet of the working cylinder 32 or the working control valve 31. This allows for the addition of emergency steering and emergency working functions to the entire machine without requiring changes to the existing valve assembly or architecture. The modification is simple, highly compatible, and cost-effective. Furthermore, using this system's emergency control method, multiple machines only require a single emergency power source 6 to operate in rotation, significantly reducing purchase and maintenance costs.

[0046] like Figure 1 and Figure 2 As shown, in this embodiment, the emergency control valve group is also provided with a steering master oil interface BP. The pump port of the main steering pump 41 is connected to the steering master oil interface BP. The emergency control valve group also includes a shuttle valve 12. The first pressure tap of the shuttle valve 12 is connected to the first working oil port A2. The second pressure tap of the shuttle valve 12 is connected to the steering master oil interface BP. The output port of the shuttle valve 12 is connected to the emergency steering control port A1.

[0047] By setting the shuttle valve 12, oil isolation can be achieved between the external emergency directional valve 11 and the main steering pump 41.

[0048] like Figure 1 and Figure 2 As shown, in this embodiment, when the emergency working control port B1 is connected to the pressure oil inlet of the working control valve 31, the connection between the emergency working control port B1 and the main working pump 42 can also be in the form of a shuttle valve 12.

[0049] like Figure 1 and Figure 2As shown, in this embodiment, the emergency control valve group is also equipped with a pressure relief port T1, and the emergency directional valve 11 is also equipped with a return port T2. The return port T2 is connected to the pressure relief port T1. When the emergency working control port B1 is connected to the working cylinder 32, the emergency directional valve 11 can be configured such that when the hydraulic oil from the emergency external oil port P1 flows to the first working oil port A2, the second working oil port B2 is connected to the return port T2. With this configuration, when the system switches to emergency steering, the working cylinder 32 can automatically unload oil through the second working oil port B2 to achieve a reset of the action.

[0050] like Figure 1 and Figure 2 As shown, in this embodiment, the emergency control valve group is also provided with an oil source inlet X1 and an oil source outlet X2. The oil source inlet X1 and the oil source outlet X2 are connected. The oil source outlet X2 is used to connect to the oil suction port of the emergency pump. The oil source inlet X1 and the pressure relief port T1 can both be connected to the system's oil tank 7. In this way, when the system is in emergency operation and normal operation, the oil flowing in the pipeline is the original oil inside the system, avoiding the mixing of oil from an external source.

[0051] like Figure 1 and Figure 2 As shown, in this embodiment, the emergency control valve assembly further includes a hydraulically controlled check valve 13. The hydraulically controlled check valve 13 is located between the second working port B2 and the emergency working control port B1. The hydraulically controlled end of the hydraulically controlled check valve 13 is hydraulically connected to the first working port A2. The hydraulically controlled check valve 13 is configured to open when hydraulic oil flows from the second working port B2 to the emergency working control port B1 and close in the reverse direction. The hydraulically controlled end is used to control the reverse flow of the hydraulically controlled check valve 13. By setting the hydraulically controlled check valve 13, backflow of oil in the working cylinder 32 to the second working port B2 can be prevented when the emergency steering control valve is in position.

[0052] like Figure 1 and Figure 2 As shown, in this embodiment, the hydraulic system with emergency function may also include a main return oil circuit. The emergency external oil port P1 can be connected to the pressure oil inlet of the steering control valve 21 through the priority valve 51, and the secondary outlet of the priority valve 51 can be connected to the main return oil circuit. In this way, the oil output from the emergency external oil port P1 can be preferentially supplied to the steering control circuit, and the excess flow can be discharged through the priority valve 51.

[0053] In this embodiment, the main working valve can also be connected to the main return oil circuit. By controlling the working valve to switch to the appropriate valve position, the working oil can be returned through the main return oil circuit.

[0054] In this embodiment, the working cylinder 32 can be a lifting cylinder, a boom telescopic cylinder, a luffing cylinder, etc.

[0055] like Figure 1 and Figure 2 As shown, in this embodiment, the main working valve can be a pneumatically controlled directional valve, and the system can also include an air source for controlling the directional switching of the main working valve. A pneumatically operated directional valve 52 can also be provided between the air source and the directional control terminal of the main working valve.

[0056] like Figure 1 and Figure 2 As shown, in this embodiment, the emergency reversing valve 11 can be a manual reversing valve.

[0057] To achieve the above objectives, this utility model also provides a working machine, which includes a hydraulic system with emergency function as described above. The working machine can be a wide-body dump truck, mining truck, or other vehicle that frequently travels or operates in mountainous areas. 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.

[0058] In the description of this utility model, 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 utility model according to the specific circumstances.

[0060] 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.

[0061] 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. An emergency control valve assembly for controlling the emergency steering and emergency operation of working devices of machinery, characterized in that, The emergency control valve assembly is equipped with an emergency external oil inlet (P1), an emergency steering control inlet (A1), and an emergency working control inlet (B1). The emergency control valve group includes an emergency directional valve (11). The emergency directional valve (11) is provided with an oil inlet (P2), a first working oil port (A2), and a second working oil port (B2). The oil inlet (P2) is connected to the emergency external oil port (P1), the first working oil port (A2) is connected to the emergency steering control port (A1), and the second working oil port (B2) is connected to the emergency working control port (B1). The emergency directional valve (11) is used to selectively guide the hydraulic oil from the oil inlet (P2) to one of the first working oil port (A2) and the second working oil port (B2).

2. The emergency control valve assembly according to claim 1, characterized in that, The emergency control valve group is also provided with a steering master oil port (BP), which is used to connect to the pump port of the main steering pump (41). The emergency control valve group also includes a shuttle valve (12), the first pressure tap of the shuttle valve (12) is connected to the first working oil port (A2), the second pressure tap of the shuttle valve (12) is connected to the steering master oil port (BP), and the output port of the shuttle valve (12) is connected to the emergency steering control port (A1).

3. The emergency control valve assembly according to claim 1, characterized in that, The emergency control valve group is also provided with a pressure relief port (T1), and the emergency reversing valve (11) is also provided with a return port (T2). The return port (T2) is connected to the pressure relief port (T1). The emergency reversing valve (11) is used to control the second working port (B2) to connect with the return port (T2) when the hydraulic oil from the emergency external oil port (P1) flows to the first working oil port (A2).

4. The emergency control valve assembly according to claim 3, characterized in that, The emergency control valve group also includes a hydraulically controlled check valve (13), which is located between the second working port (B2) and the emergency working control port (B1). The hydraulically controlled end of the hydraulically controlled check valve (13) is hydraulically connected to the first working port (A2). The hydraulically controlled check valve (13) is configured to open when hydraulic oil flows from the second working port (B2) to the emergency working control port (B1) and close in the reverse direction. The hydraulically controlled end is used to control the reverse opening of the hydraulically controlled check valve (13).

5. The emergency control valve assembly according to any one of claims 1 to 4, characterized in that, The emergency control valve assembly is also provided with an oil source inlet (X1) and an oil source outlet (X2), and the oil source inlet (X1) and the oil source outlet (X2) are connected.

6. A hydraulic system with emergency function, characterized in that, The hydraulic system with emergency function includes: The steering control circuit includes a steering control valve (21) and a steering cylinder (22), wherein the steering control valve (21) is used to control the direction of movement of the steering cylinder (22); The working device control circuit includes a working control valve (31) and a working cylinder (32). The main power unit includes a main steering pump (41) for supplying oil to the steering control valve (21) and a main working pump (42) for supplying oil to the working control valve (31). The emergency control valve assembly according to any one of claims 1 to 5, wherein the emergency steering control port (A1) is connected to the steering control valve (21), and the emergency working control port (B1) is connected to the pressure oil inlet of the working cylinder (32) or the working control valve (31).

7. The hydraulic system with emergency function according to claim 6, characterized in that, The emergency control valve group is also provided with a steering master oil port (BP). The pump port of the main steering pump (41) is connected to the steering master oil port (BP). The emergency control valve group also includes a shuttle valve (12). The first pressure tap of the shuttle valve (12) is connected to the first working oil port (A2). The second pressure tap of the shuttle valve (12) is connected to the steering master oil port (BP). The output port of the shuttle valve (12) is connected to the emergency steering control port (A1).

8. The hydraulic system with emergency function according to claim 6, characterized in that, The emergency working control port (B1) is connected to the working cylinder (32). The emergency control valve group is also provided with a pressure relief port (T1). The emergency reversing valve (11) is also provided with a return port (T2). The return port (T2) is connected to the pressure relief port (T1). The emergency reversing valve (11) is used to control the second working port (B2) to connect with the return port (T2) when the hydraulic oil from the emergency external oil port (P1) flows to the first working oil port (A2).

9. The hydraulic system with emergency function according to claim 8, characterized in that, The emergency control valve group also includes a hydraulically controlled check valve (13), which is located between the second working port (B2) and the emergency working control port (B1). The hydraulically controlled end of the hydraulically controlled check valve (13) is hydraulically connected to the first working port (A2). The hydraulically controlled check valve (13) is configured to open when hydraulic oil flows from the second working port (B2) to the emergency working control port (B1) and close in the reverse direction. The hydraulically controlled end is used to control the reverse opening of the hydraulically controlled check valve (13).

10. A type of operating machinery, characterized in that, The operating machinery includes the hydraulic system with emergency function as described in any one of claims 6 to 9.

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