A wear-resistant multi-way reversing valve

Abstract

The present invention belongs to the technical field of supporting equipment for marine and water transport engineering, and specifically discloses a wear-resistant multi-way reversing valve, comprising: a valve body with a sliding channel and an oil chamber, a valve core sliding in the sliding channel, a second oil hole and a first oil hole respectively provided on the side and end of the valve core, and an electromagnetic push rod assembly consisting of a push rod, an electromagnetic valve body, a first oil tank, a second oil tank, an electromagnetic oil chamber, a piston, a first armature, a second armature, an electromagnetic coil, an elastic member, and a plug. When the electromagnetic coil is energized, the armature can drive the piston and the push rod to move together, causing the valve core to move and shift gears while also causing the piston to compress the lubricating oil in the electromagnetic oil chamber, allowing the lubricating oil to flow between the two oil chambers on both sides of the valve core. During the flow process, due to the principle of liquid pressure transmission, a small amount of lubricating oil can flow out from the second oil hole, thereby achieving active lubrication, thereby overcoming the defect of existing reversing valves that cannot actively lubricate.

Description

Technical Field

[0001] The present invention belongs to the technical field of marine and water transport engineering equipment support, and in particular relates to a wear-resistant multi-way reversing valve. Background Art

[0002] The hydraulic reversing valve is a commonly used component in hydraulic systems. It mainly plays the role of opening and closing the oil circuit and switching the oil circuit. According to the structure, it can be divided into slide valve type, rotary valve type and ball valve type. According to the driving method of the valve core, it can be divided into manual type, motorized type, hydraulic type and electromagnetic type. Among them, the electromagnetic slide valve type multi-way reversing valve is widely used in industrial products because of its fast response speed, easy control and high precision.

[0003] However, as the valve core slides in the sliding channel, the outer wall of the valve plug of the valve core and the inner wall of the sliding channel are prone to wear due to long-term sliding friction. Since the reversing valve has high requirements for sealing, the lubrication between the outer wall of the valve plug and the sliding channel can usually only be passively lubricated by the penetration of hydraulic oil, and active lubrication is not possible. Therefore, the lubrication effect is limited, which will seriously affect the service life of the reversing valve.

[0004] Patent No. CN202123202054.0 discloses an ultra-high-pressure hydraulic solenoid reversing valve, comprising a reversing valve block, a reversing valve sleeve, a reversing valve core, an electromagnet spring baffle, an electromagnet, a first electromagnet ejector pin, and a second electromagnet ejector pin. The bottom of the reversing valve block is provided with first, second, third, and fourth oil delivery ports. The reversing valve block has a chamber disposed therein. Electromagnets for path A and path B are located at the bottom of the reversing valve block. The reversing valve sleeve, reversing valve core, electromagnet spring baffle, electromagnet, first electromagnet ejector pin, and second electromagnet ejector pin are all mounted within the reversing valve block. The reversing valve block is made of a wear-resistant alloy and is internally fitted with a wear-resistant alloy steel sleeve. The reversing valve core is also made of a wear-resistant alloy. Although the use of wear-resistant materials in this reference improves the pressure resistance and service life of the device, the high processing cost and manufacturing difficulty make it difficult to promote and apply in production. Furthermore, the valve plug and the sliding channel lack active lubrication.

[0005] The disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of this application. Summary of the Invention

[0006] The object of the present invention is to provide a wear-resistant multi-way directional valve, thereby overcoming the defect that the existing directional valve cannot automatically and actively lubricate the valve plug and the sliding channel during operation.

[0007] To achieve the above-mentioned purpose, the present invention provides a wear-resistant multi-way reversing valve, including a valve body, a plurality of sliding channels are provided in the valve body, a plurality of oil chambers are provided along the sliding channels, the valve body is provided with oil inlets and outlets separately connected to the oil chambers, a slidable valve core is provided in each of the sliding channels, a plurality of valve plugs are provided on the valve core, the outer periphery of the valve plug is in sliding contact with the inner wall of the sliding channel, an electromagnetic push rod assembly is provided at each end of the valve body, the electromagnetic push rod assembly includes a movable push rod, the push rod is connected to the end of the valve core to drive the valve core to slide along the sliding channel, and the electromagnetic push rod assembly also It includes an electromagnetic valve body, an electromagnetic oil chamber is provided in the electromagnetic valve body, a slidable piston is provided in the electromagnetic oil chamber, one end of the push rod is fixedly connected to one end of the piston, and the other end of the push rod is fixedly connected to the end of the valve core, a first armature and a second armature are respectively provided in the piston and the electromagnetic oil chamber, an electromagnetic coil is provided on the outer periphery of the electromagnetic oil chamber, and an oil filling hole connected to the electromagnetic oil chamber is provided on the electromagnetic valve body; it also includes a lubricating oil channel, a first oil hole is provided at the other end of the piston, and a plurality of second oil holes are provided on the outer periphery of the valve plug, and the lubricating oil channel connects the first oil hole and the second oil hole to each other.

[0008] Preferably, in the above technical solution, the solenoid valve body includes a first end and a second end relative to each other, the first end is fixedly connected to the valve body, the two ends of the electromagnetic oil chamber are respectively facing the first end and the second end, the piston can move back and forth between the two ends of the electromagnetic oil chamber, and the outer periphery of the piston is movably sealed with the inner wall of the electromagnetic oil chamber.

[0009] Preferably, in the above technical solution, the second armature is arranged at the end of the electromagnetic oil chamber corresponding to the second end, the first armature is arranged at the end of the piston facing the second end, and the oil filling hole passes through the middle of the second armature.

[0010] Preferably, the above technical solution also includes an elastic member, which is arranged in the electromagnetic oil chamber, and the two ends of the elastic member are respectively in contact with the piston and the second armature, and the valve core can remain stationary in the sliding channel through the elastic force of the elastic member.

[0011] Preferably, in the above technical solution, a plug is provided at each second end, and an oil filling channel is provided on the plug. One end of the oil filling channel is connected to the oil filling hole, and the other end of the oil filling channel extends outward from the end of the plug to form an oil drain hole, and a detachable oil drain plug is provided in the oil drain hole.

[0012] Preferably, the above technical solution also includes a first oil tank and a second oil tank, the first oil tank and the second oil tank are respectively fixedly connected to the solenoid valve body, the first oil tank is interconnected with each of the oil injection channels located at one end of the valve body through a first oil channel, and the second oil tank is interconnected with each of the oil injection channels located at the other end of the valve body through a second oil channel.

[0013] Preferably, in the above technical solution, the first fuel tank and the second fuel tank are respectively provided with a refueling port, and the mouth of the refueling port is provided with a detachable sealing cover.

[0014] Preferably, in the above technical solution, the diameter of the opening of the first oil hole is larger than the diameter of the bottom of the first oil hole.

[0015] Preferably, in the above technical solution, the lubricating oil channel includes a main oil channel and an auxiliary oil channel, both ends of the main oil channel pass through the end of the valve core and the end of the push rod, and are connected to the bottom of the first oil hole at the same time, one end of the auxiliary oil channel is connected to the side of the main oil channel, and the other end of the auxiliary oil channel is connected to the second oil hole, and the diameter of the main oil channel is larger than the diameter of the auxiliary oil channel.

[0016] Preferably, in the above technical solution, the second oil hole is arranged near both ends of the valve plug, and when the valve core moves along the sliding channel, the mouth of the second oil hole can contact the inner wall of the sliding channel between each oil cavity.

[0017] Compared with the existing technology, the present invention has the following beneficial effects:

[0018] 1. The wear-resistant multi-way reversing valve in the present invention is provided with an electromagnetic oil chamber for storing lubricating oil in the electromagnetic push rod assembly of the electromagnetic reversing valve, a piston is provided on the push rod, and lubricating oil channels are provided on the push rod and the valve core. A first oil hole and a second oil hole connected to the lubricating oil channel are respectively opened on the outer walls of the piston and the valve plug. When the electromagnetic coil is energized, the armature can drive the piston and the push rod to move together, and while the valve core moves to shift gears, the piston can also compress the lubricating oil in the electromagnetic oil chamber, so that the lubricating oil can flow between the two oil chambers on both sides of the valve core. During the flow process, due to the principle of liquid pressure transmission, a small amount of lubricating oil can flow out from the second oil hole, thereby playing a role of active lubrication, overcoming the defect that the existing reversing valve cannot actively lubricate.

[0019] 2. The electromagnetic oil chamber in the present invention is also provided with an elastic part, which can play a role of automatic reset. The elastic part is located in the electromagnetic oil chamber and can be immersed in lubricating oil for a long time. It can not only play an anti-rust effect, but also reduce the friction coefficient between the elastic part and the electromagnetic oil chamber, thereby improving the service life of the elastic part and the corresponding speed.

[0020] 3. The plug in the present invention is provided with an oil drain hole, and an oil drain plug is provided on the oil drain hole. The oil drain plug can be opened during maintenance and replacement of lubricating oil, which facilitates replacement of the lubricating oil in the electromagnetic oil chamber and discharge of impurities in the electromagnetic oil chamber.

[0021] 4. The first oil tank and the second oil tank in the present invention can store lubricating oil and can maintain the oil pressure in the electromagnetic oil chamber on both sides of the valve core. A refueling port is respectively provided on the first oil tank and the second oil tank. When refueling, the two refueling ports are opened at the same time. When refueling is added to any one of the refueling ports, the air in the first oil tank, the second oil tank, the first oil channel, the second oil channel, the oil filling channel and the electromagnetic oil chamber can be completely discharged, so that the lubricating oil is filled more fully.

[0022] 5. The first oil hole in the present invention is a trumpet-shaped structure that is wide at the top and narrow at the bottom. When the piston compresses the lubricating oil in the electromagnetic oil chamber, the lubricating oil can flow into the lubricating oil channel more easily.

[0023] 6. The diameter of the main oil passage in the present invention is larger than that of the auxiliary oil passage, which enables the lubricating oil in the main oil passage to enter the auxiliary oil passage more easily.

[0024] 7. The second oil hole in the present invention is located close to both ends of the valve plug to ensure that when the valve core moves along the sliding channel, the mouth of the second oil hole can contact the inner wall of the sliding channel between the oil chambers, thereby achieving a better and more economical lubrication effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the wear-resistant multi-way reversing valve of the present invention.

[0026] Figure 2 This is a partial cross-sectional view of a valve core unit of a wear-resistant multi-way reversing valve.

[0027] Figure 3 It is a partial cross-sectional view of the valve core, push rod, piston and first armature.

[0028] Description of main reference numerals:

[0029] 100-valve body, 101-sliding channel, 102-oil chamber, 103-oil inlet and outlet;

[0030] 200-valve core, 201-valve plug, 202-lubricating oil channel, 203-first oil hole, 204-second oil hole, 205-main oil channel, 206-auxiliary oil channel;

[0031] 300- electromagnetic push rod assembly, 310- push rod, 320- electromagnetic valve body, 321- first end, 322- second end, 323- first oil tank, 324- second oil tank, 325- first oil channel, 326- second oil channel, 327- oil filling port, 328- sealing cover, 330- electromagnetic oil chamber, 340- piston, 350- first armature, 360- second armature, 361- oil filling hole, 370- electromagnetic coil, 380- elastic part, 390- plug, 391- oil filling channel, 392- oil drain hole, 393- oil drain plug. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inside", "outside", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The terms "first," "second," and "third" are used solely for descriptive purposes and to distinguish technical features. They are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified or limited, the terms "installed," "connected," "connected," and "set" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. The following describes an embodiment of the present invention based on its overall structure.

[0036] like Figures 1 to 3 As shown, the wear-resistant multi-way reversing valve in this embodiment includes: a valve body 100, a sliding channel 101, an oil chamber 102, an oil inlet and outlet 103, a main oil channel 104, an auxiliary oil channel 105, a valve core 200, a valve plug 201, a lubricating oil channel 202, a first oil hole 203, a second oil hole 204, an electromagnetic push rod assembly 300, a push rod 310, an electromagnetic valve body 320, a first end 321, a second end 322, a first oil tank 323, a second oil tank 324, a first oil channel 325, a second oil channel 326, a refueling port 327, a sealing cover 328, an electromagnetic oil chamber 330, a piston 340, a first armature 350, a second armature 360, an oil filling hole 361, an electromagnetic coil 370, an elastic member 380, a plug 390, an oil filling channel 391, an oil drain hole 392, and an oil drain plug 393.

[0037] A plurality of cylindrical sliding channels 101 are provided in the valve body 100. The sliding channels 101 are parallel to each other and spaced a certain distance apart from each other. Five oil chambers 102 are provided along the axis of the sliding channel 101. Oil inlet and outlet ports 103 are provided on the valve body 100 to control the B path, P path, A path and T path. The oil output of the B path and the T path is communicated with each corresponding oil chamber 102 separately, and the oil inlet and outlet ports 103 of the P path and the A path are communicated with the corresponding oil chamber 102 at the same time. A slidable valve core 200 is installed in each sliding channel 101. Two valve plugs 201 are provided on the valve core 200. The outer periphery of the valve plug 201 is in sliding contact with the inner wall of the sliding channel 101. Two valve plugs 201 are provided at both ends of the valve body 100. The electromagnetic push rod assembly 300 includes a push rod 310, a solenoid valve body 320, an electromagnetic oil chamber 330 and a piston 340. A solenoid valve body 320 is installed at both ends of each sliding channel 101. An electromagnetic oil chamber 330 is opened in the solenoid valve body 320. The solenoid valve body 320 includes a first end 321 and a second end 322 opposite to each other. The first end 321 is fixedly connected to the valve body 100. The two ends of the electromagnetic oil chamber 330 are respectively facing the first end 321 and the second end 322. A slidable piston 340 is installed in the electromagnetic oil chamber 330. One end of the push rod 310 is fixedly connected to one end of the piston 340, and the other end of the push rod 310 is fixedly connected to the end of the valve core 200. A first armature 350 and a second armature 360 ​​are respectively installed inside. The second armature 360 ​​is installed at the end of the electromagnetic oil chamber 330 corresponding to the second end 322. The first armature 350 is installed at the end of the piston 340 facing the second end 322. An electromagnetic coil 370 is installed on the outer periphery of the electromagnetic oil chamber 330. An oil filling hole 361 connected to the electromagnetic oil chamber 330 is opened on the solenoid valve body 320. The oil filling hole 361 passes through the middle of the second armature. When the electromagnetic coil 370 is energized, the magnetic circuit between the first armature 350 and the second armature 360 ​​can be connected, so that the first armature 350 and the second armature 360 ​​are close to each other. An elastic member 380 is also installed in the electromagnetic oil chamber 330. The elastic member 380 is a cylindrical spring structure. One end of 380 is sleeved on the first armature 350 and abuts against the end of the piston 340, and the other end of the elastic member 380 abuts against the end face of the second armature 360. The valve core 200 can remain stationary in the sliding channel 101 through the elastic force of the elastic member 380. A first oil hole 203 is provided on the end face of the piston 340, and a plurality of second oil holes 204 are provided on the outer periphery of the valve plug 340. A lubricating oil channel 202 is provided inside the push rod 310 and the valve core 200. The lubricating oil channel 202 connects the first oil hole 203 and the second oil hole 204 to each other. A closed space for storing lubricating oil is formed between the piston 340 and one end 322 of the electromagnetic oil chamber 330 near the second end, which is called the effective volume area of ​​the electromagnetic oil chamber 330.

[0038] It is understandable that the piston 340 can reciprocate between the two ends of the electromagnetic oil chamber 330 , and at the same time, the outer periphery of the piston 340 and the inner wall of the electromagnetic oil chamber 330 are movably sealed.

[0039] In addition, a plug 390 is provided at each second end 322, and an oil filling channel 391 is opened in the center of the plug 390. One end of the oil filling channel 391 is connected to the oil filling hole, and the other end of the oil filling channel 391 extends outward from the end of the plug 390 to form an oil drain hole 392, and a removable oil drain plug 393 is installed in the oil drain hole 392; the first oil tank 323 and the second oil tank 324 are respectively fixedly connected to the solenoid valve body 320, and the first oil tank 323 connects the oil filling channels 391 located at one end of the valve body 100 to each other through the first oil channel 325, and the second oil tank 324 connects the oil filling channels 391 located at the other end of the valve body 100 to each other through the second oil channel 326; a refueling port 327 is respectively opened at the top of the first oil tank 323 and the second oil tank 324, and a removable sealing cover 328 is installed at the mouth of the refueling port 327.

[0040] In addition, the diameter of the opening of the first oil hole 203 is larger than the diameter of the bottom of the first oil hole 203, so that the hole wall of the first oil hole 203 is a trumpet-shaped structure; the lubricating oil channel 202 includes a main oil channel 205 and an auxiliary oil channel 206. The two ends of the main oil channel 205 pass through the end of the valve core 200 and the end of the push rod 310, and are simultaneously connected to the bottom of the first oil hole 203 on the end faces of the two pistons 340. One end of the auxiliary oil channel 206 is connected to the side of the main oil channel 205, and the other end of the auxiliary oil channel 206 is connected to the second oil hole 204. The diameter of the main oil channel 205 is larger than the diameter of the auxiliary oil channel 206, so that the outflow of lubricating oil is smoother; the second oil hole 204 is arranged near the two ends of the valve plug 201 to ensure that when the valve core 200 moves along the sliding channel 101, the mouth of the second oil hole 204 can contact the inner wall of the sliding channel 101 between each oil chamber 102.

[0041] Next, the working principle of a wear-resistant multi-way reversing valve in this embodiment is described in detail to enable those skilled in the art to better understand the present invention:

[0042] When adding lubricating oil, first add oil from the refueling port 327 of the first oil tank 323. The lubricating oil can first flow into the electromagnetic oil chambers 330 interconnected with the first oil tank 323, then pass through the lubricating oil channel 202, and then enter the electromagnetic oil chambers 330 interconnected with the second oil tank 323. Finally, the second oil tank 324 is continuously filled until the liquid level of the lubricating oil is close to the refueling port of the second oil tank 324 or a small amount overflows, and then the sealing covers 328 on the first oil tank 323 and the second oil tank 324 are covered.

[0043] When the reversing valve is working, after the electromagnetic coil 370 is energized, a magnetic circuit can be continuously formed between the first armature 350 and the second armature 360 ​​at both ends of each valve core 200, so that the two armatures can attract each other, and the piston 340 drives the push rod 310 to push the valve core 200 to slide along the sliding channel 101. Through the position change of the plug valve 201, the oil circuit switching of each inlet and outlet oil port 103 is realized; when the piston 340 moves in the electromagnetic oil chamber 330, the effective volume area of ​​the two electromagnetic oil chambers 330 at both ends of the valve core 200 can be continuously expanded or reduced synchronously with an equal difference, so that the lubricating oil can flow back and forth in the main oil channel 205 of the lubricating oil channel 202. During the flow process, the lubricating oil can flow from the auxiliary oil channels 206 to the second oil hole 204 due to the instantaneous increase in pressure and the action of gravity, thereby actively lubricating the outer wall of the valve core 200 and the inner wall of the sliding channel 101.

[0044] To sum up, the wear-resistant multi-way reversing valve in this embodiment is achieved by providing an electromagnetic oil chamber for storing lubricating oil in the electromagnetic push rod assembly of the electromagnetic reversing valve, providing a piston on the push rod, and providing lubricating oil channels on the push rod and the valve core. A first oil hole and a second oil hole connected to the lubricating oil channel are respectively opened on the outer walls of the piston and the valve plug. When the electromagnetic coil is energized, the armature can drive the piston and the push rod to move together, and while moving the valve core to shift gears, the piston can also compress the lubricating oil in the electromagnetic oil chamber, so that the lubricating oil can flow between the two oil chambers on both sides of the valve core. During the flow process, due to the principle of liquid pressure transmission, a small amount of lubricating oil can flow out from the second oil hole, thereby playing a role of active lubrication, overcoming the defect of not being able to actively lubricate.

[0045] The foregoing descriptions of specific exemplary embodiments of the present invention are for the purpose of illustration and description. These descriptions are not intended to limit the invention to the precise form disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although an embodiment of the present invention has been shown and described, this specific embodiment is only an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described can be combined in an appropriate manner in any one or more embodiments or examples. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can make modifications, substitutions, variations and various different selections and changes to the embodiments as needed without departing from the principles and purpose of the present invention after reading this specification, but they are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A wear-resistant multi-way reversing valve, comprising a valve body, a plurality of sliding channels provided therein, a plurality of oil chambers provided along the sliding channels, an oil inlet and outlet provided on the valve body and independently communicating with the oil chambers, a slidable valve core provided in each of the sliding channels, a plurality of valve plugs provided on the valve core, the outer periphery of the valve plugs being in sliding contact with the inner wall of the sliding channel, an electromagnetic push rod assembly provided at each end of the valve body, the electromagnetic push rod assembly including a movable push rod connected to an end of the valve core to drive the valve core to slide along the sliding channel, characterized in that: The electromagnetic push rod assembly also includes a solenoid valve body, an electromagnetic oil chamber is provided in the solenoid valve body, a slidable piston is provided in the electromagnetic oil chamber, one end of the push rod is fixedly connected to one end of the piston, and the other end of the push rod is fixedly connected to the end of the valve core, a first armature and a second armature are provided in the piston and the electromagnetic oil chamber respectively, an electromagnetic coil is provided on the outer periphery of the electromagnetic oil chamber, and an oil filling hole connected to the electromagnetic oil chamber is provided on the solenoid valve body; It also includes a lubricating oil passage, a first oil hole is provided at the other end of the piston, and a plurality of second oil holes are provided on the outer periphery of the valve plug, and the lubricating oil passage connects the first oil hole and the second oil hole to each other; The solenoid valve body includes a first end and a second end opposite to each other, the first end being fixedly connected to the valve body, the two ends of the electromagnetic oil chamber facing the first end and the second end respectively, the piston being capable of reciprocating between the two ends of the electromagnetic oil chamber, and the outer periphery of the piston being movably sealed against the inner wall of the electromagnetic oil chamber; The diameter of the opening of the first oil hole is larger than the diameter of the bottom of the first oil hole; The lubricating oil channel includes a main oil channel and an auxiliary oil channel. Both ends of the main oil channel pass through the end of the valve core and the end of the push rod, and are connected to the bottom of the first oil hole at the same time. One end of the auxiliary oil channel is connected to the side of the main oil channel, and the other end of the auxiliary oil channel is connected to the second oil hole. The diameter of the main oil channel is larger than the diameter of the auxiliary oil channel.

2. The wear-resistant multi-way directional valve according to claim 1, characterized in that: The second armature is arranged at an end of the electromagnetic oil chamber corresponding to the second end, the first armature is arranged at an end of the piston facing the second end, and the oil filling hole passes through the middle of the second armature.

3. The wear-resistant multi-way directional control valve according to claim 2, characterized in that: It also includes an elastic member, which is arranged in the electromagnetic oil chamber, and the two ends of the elastic member are respectively in contact with the piston and the second armature, and the valve core can remain stationary in the sliding channel through the elastic force of the elastic member.

4. The wear-resistant multi-way directional control valve according to claim 3, characterized in that: A plug is provided at each second end, and an oil filling channel is provided on the plug. One end of the oil filling channel is connected to the oil filling hole, and the other end of the oil filling channel extends outward from the end of the plug to form an oil drain hole. A detachable oil drain plug is provided in the oil drain hole.

5. The wear-resistant multi-way directional valve according to claim 4, characterized in that: It also includes a first oil tank and a second oil tank, the first oil tank and the second oil tank are respectively fixedly connected to the solenoid valve body, the first oil tank is interconnected with the oil injection channels located at one end of the valve body through a first oil channel, and the second oil tank is interconnected with the oil injection channels located at the other end of the valve body through a second oil channel.

6. The wear-resistant multi-way directional control valve according to claim 5, characterized in that: The first fuel tank and the second fuel tank are respectively provided with a fuel filling port, and the mouth of the fuel filling port is provided with a detachable sealing cover.

7. The wear-resistant multi-way directional control valve according to claim 1, characterized in that: The second oil holes are arranged near both ends of the valve plug. When the valve core moves along the sliding channel, the mouth of the second oil hole can contact the inner wall of the sliding channel between the oil chambers.

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