Electronically controlled multi-way valve

Abstract

The present invention relates to an electrically controlled multi-way valve, comprising a first valve body, a first control assembly, a motor, and a controller; the first valve body having a first oil return port, a first oil inlet port connected to an oil pump, and an oil inlet and outlet port connected to an oil cylinder; an inlet and outlet oil passage connecting the inlet and outlet ports, the first oil return port, and the first oil inlet is provided within the first valve body; the first valve body also has two oil drain passages, respectively disposed at opposite ends of the inlet and outlet oil passages and connected to the first oil return port; the first control assembly comprises a valve stem slidably disposed on the inlet and outlet oil passages, and a driving member disposed within the first valve body, the driving member being configured to drive the valve stem to slide back and forth to control the opening and closing of the inlet and outlet oil passages, and when the valve stem slides back and forth, pressurized oil leaking from both ends of the valve stem can be discharged from the oil drain passages; the motor being electrically connected to the oil pump, the motor being configured to drive the oil pump to rotate and supply oil; and the controller being electrically connected to the driving member and the motor, and being configured to control the synchronous operation of the motor and the driving member. This ensures smooth movement of the valve stem while protecting the multi-way valve.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic valve bodies, in particular to an electrically controlled multi-way valve. Background Art

[0002] The development of smart manufacturing products and industries, such as smart warehousing, smart logistics, smart factories, and the Industrial Internet, has led to an increasing demand for automated guided vehicle (AGV) forklifts. However, existing multi-way valves often require manual control and operation, making them incapable of autonomous driving or remote control.

[0003] Furthermore, in the existing multi-way valve, when the oil circuit is controlled by the valve stem, leakage of pressurized oil may cause the valve stem to become stuck during movement. Summary of the Invention

[0004] Based on this, it is necessary to provide an electrically controlled multi-way valve to address the above problems. The electrically controlled multi-way valve can ensure smooth movement of the valve stem while realizing the unmanned driving or remote control function of the AGV unmanned forklift.

[0005] and a tube connecting the dischar e side of the pump with a plug in the forward end of the crank case, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, and said former tube which connects the oil drain plug, and said former tube which connects the oil drain plug, and said former tube which connects the oil drain plug, and said former tube which connects the oil drain plug, and said former

[0006] In the above-mentioned electrically controlled multi-way valve, two oil drain paths respectively arranged at the two ends of the inlet and outlet oil paths are further provided in the first valve body. When the valve stem slides, the pressure oil leaked from the two ends of the valve stem can return to the first return oil port through the oil drain paths at the two ends respectively, thereby ensuring the pressure balance at both ends of the valve stem and ensuring that the valve stem can slide smoothly during movement; and, the electrically controlled multi-way valve will only control the motor to start when it needs to work, and the motor drives the oil pump to rotate and supply oil, and the pressure oil is supplied through the first oil inlet. At the same time, the controller controls the driving member to drive the valve stem to slide in the inlet and outlet oil paths to ensure that the opening between the inlet and outlet oil ports and the first oil inlet and the first return oil port matches the oil supply of the oil pump, so as to better control the rising speed and realize the unmanned driving or remote control function of the AGV unmanned forklift.

[0007] In one embodiment, the number of the first valve bodies and the number of the first control components are both plural, and the first control components are arranged in a one-to-one correspondence with the first valve bodies.

[0008] Such an arrangement ensures that the electrically controlled multi-way valve can realize multiple functions and has a wide range of applications.

[0009] In one embodiment, the oil inlet and outlet ports in each of the first valve bodies include a first oil inlet and outlet port and a second oil inlet and outlet port respectively connected to the two ends of the tilt cylinder or the two ends of the accessory cylinder, and the oil inlet and outlet circuits include a first return oil circuit, a second return oil circuit, a first oil inlet circuit and a second oil inlet circuit; the first oil return circuit is provided between the first oil return port and the first oil inlet and outlet ports, the second oil return circuit is provided between the first oil return port and the second oil inlet and outlet ports, the first oil inlet circuit is provided between the first oil inlet and the first oil inlet and outlet ports, and the second oil inlet circuit is provided between the first oil inlet and the second oil inlet and outlet ports.

[0010] In one embodiment, the number of the first oil return ports is two. In the length direction of the inlet and outlet oil passages, the two first oil return ports are respectively arranged on both sides of the first oil inlet, the first oil inlet and outlet ports are arranged between the first oil inlet and one of the first oil return ports, and the second oil inlet and outlet ports are arranged between the first oil inlet and the other first oil return port.

[0011] With such an arrangement, the two first oil return ports can prevent the internal oil circuits from being too complicated or interfering with each other, thereby facilitating the processing of the first valve body.

[0012] In one embodiment, the first valve body connected to the tilt cylinder also has a balancing oil circuit connected to the first inlet and outlet oil ports and the second inlet and outlet oil ports, and the first control component also includes a balancing valve arranged on the balancing oil circuit, and the balancing valve can prevent the tilt cylinder from operating when the oil pump is not working.

[0013] With this arrangement, the first valve body connected to the tilt cylinder needs to pass through the balance valve when oil enters and exits. The balance valve can prevent the tilt cylinder from tilting forward when the oil pump is not working, thereby causing danger.

[0014] In one embodiment, a sealing screw plug is provided at one end of the oil drain passage away from the oil inlet and outlet passages.

[0015] With this arrangement, the oil drain passage can be grooved from one side wall of the first valve body during processing and sealed from the outside by a sealing screw plug, thereby facilitating the production and processing of the first valve body while ensuring the sealing of the oil passage.

[0016] In one embodiment, the angle between the oil drain passage and the oil inlet and outlet passage is 90 degrees.

[0017] With this arrangement, the angle between the oil drain passage and the inlet and outlet oil passages is 90 degrees, which prevents the oil drain passage from interfering with other internal oil passages in the first valve body, thereby further facilitating the production and processing of the first valve body.

[0018] In one embodiment, the driving member includes a first electromagnet and a second electromagnet respectively located at two ends of the inlet and outlet oil passages, and the first electromagnet and the second electromagnet can generate a thrust or a pull on the valve stem through an electric current.

[0019] With this arrangement, the magnitude of the current flowing through the first and second electromagnets can change the magnitude of the thrust or pull on the valve stem, thereby controlling the opening between the oil inlet and outlet ports and the first oil inlet and the first oil return port.

[0020] In one embodiment, at least one end of the valve stem is connected to the inner wall of the end corresponding to the inlet and outlet oil passage via an elastic member, and the elastic member can exert an elastic force away from the valve stem.

[0021] With such arrangement, the elastic member can assist the valve stem in resetting when the first electromagnet or the second electromagnet is powered off.

[0022] In one embodiment, the electrically controlled multi-way valve further includes a second valve body and a lifting control assembly for controlling the movement of the lifting cylinder. The lifting control assembly includes a control valve electrically connected to the controller and capable of controlling the opening / closing of the second valve body.

[0023] With this setting, when the lifting cylinder needs to perform a lifting action, the controller controls the opening of the solenoid valve to match the oil supply of the oil pump, so as to better control the rising speed and protect the electronically controlled multi-way valve; when the lifting cylinder needs to perform a descending action, the controller controls the solenoid valve to open the corresponding opening to prevent the lifting cylinder from descending too quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic structural diagram of the electrically controlled multi-way valve provided by the present invention;

[0026] Figure 2 The present invention provides Figure 1Schematic diagram of the structure from a top-down perspective;

[0027] Figure 3 The present invention provides Figure 2 Schematic diagram of the cross-sectional structure at aa in the middle;

[0028] Figure 4 The present invention provides Figure 3 Schematic diagram of the local structure Figure 1 ;

[0029] Figure 5 The present invention provides Figure 3 Schematic diagram of the local structure Figure 2 ;

[0030] Figure 6 This is a piping diagram of the electronically controlled multi-way valve provided by the present invention.

[0031] Figure numerals: 1, first valve body; 11, oil inlet and outlet circuits; 111, first oil return circuit; 112, second oil return circuit; 113, first oil inlet circuit; 114, second oil inlet circuit; 12, oil drain circuit; 13, balancing oil circuit; 2, first control assembly; 21, valve stem; 22, drive member; 221, first electromagnet; 222, second electromagnet; 23, balancing valve; 3, second valve body; 31, second oil return circuit; 32, second oil inlet circuit; 4, lifting control assembly; 41, control valve; 411, first proportional solenoid valve; 412, second proportional solenoid valve; 5, sealing plug; 6, elastic member; P1, first oil inlet; P2, second oil inlet; T1, first oil return port; T2, second oil return port; A1, first oil inlet and outlet; A2, third oil inlet and outlet; B1, second oil inlet and outlet. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0033] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0034] Furthermore, 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0035] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0037] The development of smart manufacturing products and industries, such as smart warehousing, smart logistics, smart factories, and the Industrial Internet, has led to an increasing demand for automated guided vehicle (AGV) forklifts. However, existing multi-way valves often require manual control and operation, making them incapable of autonomous or remotely controlled AGVs. Furthermore, the valve stem in existing multi-way valves, which controls the flow of oil, can cause valve stem jamming due to pressurized oil leakage.

[0038] In order to solve the above problems, Figures 1 to 6 As shown, the present invention provides an electrically controlled multi-way valve, which can realize the unmanned driving or remote control function of an AGV unmanned forklift while ensuring that the valve stem can move smoothly.

[0039] like Figure 3 and Figure 5As shown, specifically, the electronically controlled multi-way valve includes a first valve body 1, a first control assembly 2, a motor and a controller; the first valve body 1 has a first oil return port T1, a first oil inlet P1 connected to the oil pump, and an oil inlet and outlet connected to the oil cylinder, and an inlet and outlet oil path 11 is provided in the first valve body 1 to connect the oil inlet and outlet ports, the first oil return port T1 and the first oil inlet P1, and the first valve body 1 is further provided with two oil drain paths 12 respectively arranged at both ends of the inlet and outlet oil path 11 and connected to the first oil return port T1; the first control assembly 2, a motor and a controller; the first valve body 1 has a first oil return port T1, a first oil inlet P1 connected to the oil pump, and an oil inlet and outlet connected to the oil cylinder, and an inlet and outlet oil path 11 is provided in the first valve body 1 to connect the oil inlet and outlet ports, the first oil return port T1 and the first oil inlet P1, and the first valve body 1 is further provided with two oil drain paths 12 respectively arranged at both ends of the inlet and outlet oil path 11 and connected to the first oil return port T1; The control component 2 includes a valve stem 21 that slides through the inlet and outlet oil circuits 11 and a driving member 22 that is arranged on the first valve body 1. The driving member 22 is used to drive the valve stem 21 to slide back and forth to control the on and off of the inlet and outlet oil circuits 11, and when the valve stem 21 slides back and forth, the pressure oil leaked from both ends of the valve stem 21 can be discharged from the oil drain circuit 12; the motor is electrically connected to the oil pump, and the motor is used to drive the oil pump to rotate and supply oil; the controller is electrically connected to the driving member 22 and the motor, and can control the motor and the driving member 22 to operate synchronously.

[0040] As mentioned above, in the existing multi-way valve, when the valve stem is used to control the oil circuit, the valve stem may become stuck due to leakage of pressure oil. In the electrically controlled multi-way valve provided by the embodiment of the present invention, the pressure oil can enter the inlet and outlet oil circuit 11 through the first oil inlet P1, and can also return to the first oil return port T1 through the inlet and outlet oil circuit 11. When the driving member 22 drives the valve stem 21 to slide back and forth in the inlet and outlet oil circuit 11, it can control the connection and disconnection between the inlet and outlet oil circuit and the first oil inlet P1 and the first oil return port T1, thereby driving the oil cylinder to move; at the same time, two oil drain paths 12 are respectively provided in the first valve body 1, which are respectively arranged at the two ends of the inlet and outlet oil circuit 11. When the valve stem 21 slides, the pressure oil leaked from the two ends of the valve stem 21 can return to the first oil return port T1 through the oil drain paths 12 at the two ends, thereby ensuring the pressure balance at the two ends of the valve stem 21 and ensuring that the valve stem 21 can slide smoothly when moving.

[0041] Furthermore, in order to prevent the oil pump from supplying oil when the multi-way valve is not working or the oil supply of the oil pump exceeds the required amount, which may cause damage to the multi-way valve, an unloading element is usually provided in the multi-way valve; however, this will increase the number of oil circuits and components in the multi-way valve, making processing and assembly difficult. In the electronically controlled multi-way valve provided by the embodiment of the present invention, only when the electronically controlled multi-way valve needs to work, the controller controls the motor to start, and the motor drives the oil pump to rotate and supply oil. Pressurized oil enters through the first oil inlet P1. At the same time, the controller controls the driving member 22 to drive the valve stem 21 to slide in the inlet and outlet oil circuit 11 to ensure that the opening between the inlet and outlet oil ports and the first oil inlet P1 and the first oil return port T1 matches the oil supply of the oil pump, thereby better controlling the rising speed and preventing the oil pump from supplying oil when the electronically controlled multi-way valve is not working or the oil supply of the oil pump exceeds the required amount, which may cause damage to the multi-way valve, thereby protecting the electronically controlled multi-way valve. At the same time, program control can be achieved through controller control to meet unmanned needs, and modern needs such as remote control can also be adopted.

[0042] The opening degree refers to the degree of opening of the communication port between the oil outlet and the first oil inlet P1 and the first oil return port T1, which can directly affect the flow rate of the pressurized oil.

[0043] like Figure 5 As shown, both the first valve bodies 1 and the first control assemblies 2 are multiple, and each first control assembly 2 corresponds to the first valve body 1. In the illustrated embodiment, there are three first valve bodies 1 and three first control assemblies 2. The inlet and outlet ports of one first valve body 1 are connected to the tilt cylinder, while the inlet and outlet ports of the other two first valve bodies 1 are connected to the two attachment cylinders, respectively. This ensures that the electrically controlled multi-way valve can perform multiple functions and has a wide range of applications.

[0044] like Figure 5As shown, specifically, the oil inlet and outlet ports in each first valve body 1 include a first oil inlet and outlet port A1 and a second oil inlet and outlet port B1 respectively connected to the two ends of the tilt cylinder or the two ends of the accessory cylinder, and the inlet and outlet oil circuit 11 includes a first oil return circuit 111, a second oil return circuit 112, a first oil inlet circuit 113 and a second oil inlet circuit 114; a first oil return circuit 111 is provided between the first oil return port T1 and the first oil inlet and outlet port A1, a second oil return circuit 112 is provided between the first oil return port T1 and the second oil inlet and outlet port B1, a first oil inlet circuit 113 is provided between the first oil inlet port P1 and the first oil inlet and outlet port A1, and a second oil inlet circuit 114 is provided between the first oil inlet port P1 and the second oil inlet and outlet port B1. There are two first oil return ports T1, one on either side of the first oil inlet P1 along the length of the inlet / outlet oil passage 11. The first oil inlet / outlet port A1 is located between the first oil inlet P1 and one of the first oil return ports T1, and the second oil inlet / outlet port B1 is located between the first oil inlet P1 and the other first oil return port T1. The two first oil return ports T1 prevent the internal oil passage from becoming overly complex or interfering with each other, facilitating the machining of the first valve body 1.

[0045] When the valve stem 21 slides upward, the first oil inlet P1 is connected to the second oil inlet and outlet B1, and the first oil return port T1 on the lower side is connected to the first oil inlet and outlet A1. The pressurized oil flows from the first oil inlet P1 through the second oil inlet path 114 and then enters one end of the cylinder from the second oil inlet and outlet B1. The oil at the other end of the cylinder flows from the first oil inlet and outlet A1 through the first oil return path 111 and then returns from the first oil return port T1 on the lower side, and the tilt cylinder or the accessory cylinder is activated. When the valve stem 21 slides downward, the first oil inlet P1 is connected to the first oil inlet and outlet A1, and the upper first oil return port T1 is connected to the second oil inlet and outlet B1. The pressurized oil flows from the first oil inlet P1 through the first oil inlet path 113 and then enters one end of the cylinder from the first oil inlet and outlet A1. The oil at the other end of the cylinder flows from the second oil inlet and outlet B1 through the second oil return path 112 and then returns from the upper first oil return port T1. The tilt cylinder or the accessory cylinder reverses or resets.

[0046] like Figure 5As shown, the driving member 22 includes a first electromagnet 221 and a second electromagnet 222, respectively located at the ends of the inlet and outlet oil passages 11. The first electromagnet 221 and the second electromagnet 222 can generate a thrust or pull on the valve stem 21 through an electric current. The magnitude of the current flowing through the first electromagnet 221 and the second electromagnet 222 can change the magnitude of the thrust or pull generated on the valve stem 21, thereby controlling the opening between the inlet and outlet oil ports and the first oil inlet port P1 and the first oil return port T1. In one embodiment, magnets with the same magnetic properties as the first electromagnet 221 and the second electromagnet 222 are provided at both ends of the valve stem 21. When the first electromagnet 221 is energized, the valve stem 21 slides upward, and when the second electromagnet 222 is energized, the valve stem 21 slides downward. Of course, in other embodiments, magnets or iron blocks with opposite magnetic properties to those of the first electromagnet 221 and the second electromagnet 222 when energized can also be set at both ends of the valve stem 21. When the first electromagnet 221 is energized, the valve stem 21 slides downward, and when the second electromagnet 222 is energized, the valve stem 21 slides upward.

[0047] Furthermore, at least one end of the valve stem 21 is connected to the inner wall of the end corresponding to the inlet and outlet oil passages 11 via an elastic member 6. The elastic member 6 can exert an elastic force on the valve stem 21 away from itself. In one embodiment, the elastic member 6 is a spring, and a spring is provided at both ends of the valve stem 21. When the valve stem 21 slides upward, the bottom spring stretches, and when the valve stem 21 slides downward, the top spring stretches, thereby assisting the valve stem 21 in resetting when the first electromagnet 221 or the second electromagnet 222 is de-energized. Of course, in other embodiments, the elastic member 6 can also be another elastic element such as a rubber block that can assist in resetting the valve stem 21, and this is not specifically limited here.

[0048] like Figure 1 、 Figure 5 and Figure 6 As shown, the first valve body 1 connected to the tilt cylinder also has a balancing oil circuit 13 communicating with the first and second oil inlet and outlet ports A1 and B1. The first control assembly 2 also includes a balancing valve 23 disposed on this balancing oil circuit 13. This balancing valve 23 prevents the tilt cylinder from actuating when the oil pump is not operating. Both oil inflow and outflow from the first valve body 1 connected to the tilt cylinder must pass through the balancing valve 23. This prevents the tilt cylinder from tilting forward when the oil pump is not operating, which could cause a dangerous situation.

[0049] like Figure 5As shown, a sealing plug 5 is provided at one end of the oil drain passage 12 away from the inlet and outlet oil passages 11. In this way, the oil drain passage 12 can be grooved from a side wall of the first valve body 1 during processing, and sealed from the outside world by the sealing plug 5, thereby facilitating the production and processing of the first valve body 1 while ensuring the sealing of the oil passage. In addition, the angle between the oil drain passage 12 and the inlet and outlet oil passages 11 is 90 degrees, preventing the oil drain passage 12 from interfering with other internal oil passages in the first valve body 1, thereby further facilitating the production and processing of the first valve body 1. At the same time, other oil passages or oil ports can also be grooved from a side wall of the first valve body 1 and sealed from the outside world by a sealing plug, thereby further facilitating the production and processing of the first valve body 1.

[0050] like Figure 4 As shown, the electrically controlled multi-way valve also includes a second valve body 3 and a lifting control assembly 4 for controlling the movement of the lifting cylinder. The second valve body 3 has a second oil return port T2, a second oil inlet P2 connected to the oil pump, and a third oil inlet and outlet A2 connected to the lifting cylinder. A second oil return circuit 31 is provided between the third oil inlet and outlet A2 and the second oil return port T2, and a second oil inlet circuit 32 is provided between the second oil inlet P2 and the third oil inlet and outlet A2; the lifting control assembly 4 includes a control valve 41 that is electrically connected to the controller and can control the opening or closing of the second valve body 3. The control valve 41 includes a first proportional solenoid valve 411 and a second proportional solenoid valve 412 respectively arranged on the second oil return circuit 31 and the second oil inlet circuit 32. The first proportional solenoid valve 411 and the second proportional solenoid valve 412 are used to control the on-off of the second oil return circuit 31 and the second oil inlet circuit 32, respectively. When the second proportional solenoid valve 412 is opened, the pressurized oil can enter the lifting cylinder from the second oil inlet port P2 through the second oil inlet circuit 32 and then from the third oil inlet and outlet port A2, and the lifting cylinder performs a lifting action; when the first proportional solenoid valve 411 is opened, the pressurized oil can return from the third oil inlet and outlet port A2 through the second oil return circuit 31 and then from the second oil return port T2, and the lifting cylinder performs a descending action.

[0051] When the lifting cylinder needs to perform a lifting action, the controller controls the motor to start, and the motor drives the oil pump to rotate and supply oil. The pressurized oil enters through the second oil inlet P2. At the same time, the controller controls the second proportional solenoid valve 412 to open to ensure that the opening of the second proportional solenoid valve 412 matches the oil supply of the oil pump, so as to better control the rising speed and avoid the oil pump supplying oil when the electronically controlled multi-way valve is not working or the oil supply of the oil pump exceeds the demand, causing damage to the multi-way valve, thereby protecting the electronically controlled multi-way valve. When the lifting cylinder needs to perform a descending action, the controller controls the first proportional solenoid valve 411 to open the corresponding opening to prevent the lifting cylinder from descending too quickly. Of course, in other embodiments, the control valve 41 can also be other types of valves, as long as it can control the opening and closing of the oil circuit.

[0052] Furthermore, the first valve body 1 and the second valve body 3 may be of a split design or of an integrally formed design.

[0053] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. An electrically controlled multi-way valve, characterized in that: include: The first valve body (1) has a first oil return port (T1), a first oil inlet port (P1) connected to an oil pump, and an oil inlet and outlet port connected to an oil cylinder. The first valve body (1) is provided with an oil inlet and outlet passage (11) connected to the oil inlet and outlet ports, the first oil return port (T1), and the first oil inlet port (P1). The first valve body (1) is also provided with two oil discharge passages (12) respectively arranged at both ends of the oil inlet and outlet passage (11) and connected to the first oil return port (T1). A first control assembly (2) includes a valve stem (21) slidably inserted into the inlet and outlet oil passages (11) and a driving member (22) provided on the first valve body (1), wherein the driving member (22) is used to drive the valve stem (21) to slide back and forth to control the on and off of the inlet and outlet oil passages (11), and when the valve stem (21) slides back and forth, the pressure oil leaked from both ends of the valve stem (21) can be discharged from the oil discharge passage (12); a motor, electrically connected to the oil pump, and configured to drive the oil pump to rotate and supply oil; as well as, a controller electrically connected to the driving member (22) and the motor, and capable of controlling the motor and the driving member (22) to operate synchronously; The included angle between the oil discharge passage (12) and the oil inlet and outlet passage (11) is 90 degrees.

2. The electrically controlled multi-way valve according to claim 1, characterized in that: The number of the first valve bodies (1) and the number of the first control components (2) are both plural, and the first control components (2) and the first valve bodies (1) are arranged in a one-to-one correspondence.

3. The electrically controlled multi-way valve according to claim 2, characterized in that: The oil inlet and outlet ports in each first valve body (1) include a first oil inlet and outlet port (A1) and a second oil inlet and outlet port (B1) respectively connected to the two ends of the tilt cylinder or the two ends of the attachment cylinder, and the oil inlet and outlet circuit (11) includes a first oil return circuit (111), a second oil return circuit (112), a first oil inlet circuit (113) and a second oil inlet circuit (114); The first oil return path (111) is provided between the first oil return port (T1) and the first oil inlet and outlet port (A1), the second oil return path (112) is provided between the first oil return port (T1) and the second oil inlet and outlet port (B1), the first oil inlet path (113) is provided between the first oil inlet port (P1) and the first oil inlet and outlet port (A1), and the second oil inlet path (114) is provided between the first oil inlet port (P1) and the second oil inlet and outlet port (B1).

4. The electrically controlled multi-way valve according to claim 3, characterized in that: The number of the first oil return ports (T1) is two. In the longitudinal direction of the oil inlet and outlet passage (11), the two first oil return ports (T1) are respectively arranged on both sides of the first oil inlet (P1), the first oil inlet and outlet port (A1) is arranged between the first oil inlet (P1) and one of the first oil return ports (T1), and the second oil inlet and outlet port (B1) is arranged between the first oil inlet (P1) and the other first oil return port (T1).

5. The electrically controlled multi-way valve according to claim 3, characterized in that: The first valve body (1) connected to the tilt oil cylinder further comprises a balancing oil circuit (13) communicating with the first oil inlet and outlet (A1) and the second oil inlet and outlet (B1). The first control assembly (2) further comprises a balancing valve (23) arranged on the balancing oil circuit (13). The balancing valve (23) can prevent the tilt oil cylinder from operating when the oil pump is not operating.

6. The electrically controlled multi-way valve according to claim 1, characterized in that: A sealing screw plug (5) is provided at one end of the oil discharge passage (12) away from the oil inlet and outlet passage (11).

7. The electrically controlled multi-way valve according to claim 1, characterized in that: The driving member (22) comprises a first electromagnet (221) and a second electromagnet (222) respectively located at two ends of the inlet and outlet oil passages (11); the first electromagnet (221) and the second electromagnet (222) can generate a thrust or a pull on the valve stem (21) through electric current.

8. The electrically controlled multi-way valve according to claim 7, characterized in that: At least one end of the valve stem (21) is connected to the inner wall of one end corresponding to the inlet and outlet oil passage (11) via an elastic member (6), and the elastic member (6) can exert an elastic force away from the valve stem (21).

9. The electrically controlled multi-way valve according to claim 1, characterized in that: The electrically controlled multi-way valve further comprises a second valve body (3) for controlling the movement of the lifting cylinder and a lifting control assembly (4); the lifting control assembly (4) comprises a control valve (41) electrically connected to the controller and capable of controlling the opening / closing of the second valve body (3).

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