Mining improved electromagnetic pilot operated valve

Abstract

The invention provides a mining improved electromagnetic pilot operated valve, and relates to the field of electromagnetic pilot operated valves. The mining improved electromagnetic pilot valve comprises a reversing valve body and an electromagnetic pilot assembly, and the electromagnetic pilot assembly comprises an electromagnetic pilot unit, a manual operation unit and a multi-stage protection unit; the electromagnetic pilot unit is installed on the reversing valve body and used for controlling opening and closing of a pilot hole, the multi-stage protection unit is installed on the reversing valve body, and the electromagnetic pilot unit and the manual operation unit are both located in the multi-stage protection unit. According to the improved electromagnetic pilot operated valve for the mine, the multi-stage protection unit is arranged, the electromagnet and the valve rod are jointly protected by the first-stage cover, the second-stage cover and the third-stage cover, so that dust is not prone to entering the position of the valve rod, a manual operation rod is also protected by the third-stage cover and the protection plate, operation is smooth, and jamming is not prone to occurring; therefore, compared with the prior art, the effect of protecting the manual operation unit and the electromagnetic pilot unit is achieved at the same time.

Description

Technical Field

[0001] The invention relates to the field of electromagnetic pilot valves, in particular to an improved electromagnetic pilot valve for mining. Background Art

[0002] The solenoid pilot valve is also called the pilot-operated solenoid valve. When the power is turned on, the electromagnetic force lifts the valve stem and the pilot valve port opens. At this time, the upper chamber of the solenoid valve is depressurized through the pilot hole, forming a pressure difference around the main valve core with lower pressure at the top and higher pressure at the bottom. Under the action of the pressure difference, the fluid pressure pushes the main valve core to move upward to open the main valve port; when the power is turned off, under the action of the spring force and the gravity of the main valve core, the valve stem is reset, the pilot hole is closed, the main valve core moves downward, and the main valve port is closed; the pressure in the upper chamber of the solenoid valve increases, and the fluid pressure pressurizes the main valve core, which makes the seal better.

[0003] Mining solenoid pilot valves often face the following typical problems when used in harsh environments such as coal and metal mines. Due to the harsh operating environment and the high dust content of mines, valve cores can easily become stuck and pilot orifices can become clogged, affecting response speed (e.g., delaying actuation time from milliseconds to seconds). Moisture corrosion: When humidity exceeds 90%, insufficient coil insulation (e.g., below Class H) can lead to rust, shortening service life by over 50%. In coal mines, solenoid pilot valves often fail or require emergency manual control. Manual control systems are complex, poorly adaptable to the environment, and prone to dust blockage. Consequently, they cannot be operated promptly in an emergency, increasing the risk of accidents.

[0004] Publication (announcement) number: CN106090397A provides a manual mechanism of an electromagnetic pilot valve for mining, wherein a push rod is provided in the electromagnetic pilot valve, a fixed shell is provided on the electromagnetic pilot valve, a push rod is provided in the fixed shell, a spring is provided between the push rod and the fixed shell, the spring is sleeved on the push rod, the fixed shell is provided with a dust cover, a connecting structure is provided at the top of the push rod, a through hole is provided at the top of the dust cover, the connecting structure passes through the through hole, and the dust cover and the connecting mechanism are sealed and connected, the fixed shell is hinged with a pressing handle, a pressure head is provided at the bottom of the pressing handle, and the pressure head and the connecting structure are correspondingly arranged.

[0005] The invention describes a manual mechanism for a solenoid pilot valve for mining, which is easy and quick to operate due to the use of a push handle operation method. At the same time, by squeezing the dust cover together with the push rod cap and the push rod, and then pressing it onto the fixed shell with a pressure ring, this structural form has excellent performance in terms of waterproofing and dustproofing, and greatly improves the service life.

[0006] In the above solution, only a dust cover corresponding to the push rod is provided on the fixed shell, and no other dust-proof and waterproof treatment is done around the push rod. When pressing the handle, the dust cover is completely pressed. Due to the high humidity in the mine and the strong corrosiveness of certain liquids to rubber, the basic service life of the dust cover is relatively short. If local cracks occur, then pressing the handle in an emergency may result in the problem of not being able to press the valve stem. Summary of the Invention

[0007] In view of the deficiencies in the prior art, the present invention provides an improved electromagnetic pilot valve for mining, which solves the problems raised in the above background technology.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: an improved electromagnetic pilot valve for mining, comprising a reversing valve body and an electromagnetic pilot assembly, the electromagnetic pilot assembly comprising an electromagnetic pilot unit, a manual operation unit and a multi-stage protection unit; the electromagnetic pilot unit is installed on the reversing valve body to control the opening and closing of the pilot hole, the multi-stage protection unit is installed on the reversing valve body, the electromagnetic pilot unit and the manual operation unit are both inside the multi-stage protection unit, the manual operation unit is used to manually control the opening and closing of the pilot hole by the electromagnetic pilot unit, and the multi-stage protection unit is used to seal and protect the electromagnetic pilot unit.

[0009] Preferably, the electromagnetic pilot unit includes an electromagnet, a valve stem, a closer and an auxiliary push rod. The closer is connected to the reversing valve body, the valve stem passes through the closer and is sealed and slidably connected to it, and there are multiple auxiliary push rods, all of which are fixed around the outside of the valve stem. The electromagnet is suspended above the valve stem, and the electromagnet can adsorb the valve stem and move it upward.

[0010] Preferably, the multi-stage protection unit includes a first-stage cover, which is fixed and sealed above the closure device. The upper end of the valve stem and the lower end of the electromagnet are both located in the cavity between the first-stage cover and the closure device. The electromagnet is sealed and fixed to the upper end of the first-stage cover. The upper ends of the auxiliary push rods pass through the first-stage cover and are sealed and slidably connected thereto. It also includes a secondary cover, which is covered on the outside of the primary cover. The upper and lower ends of the secondary cover are sealed with the primary cover by elastic sealing covers, and the upper end of the auxiliary push rod is fixed to the inner top wall of the secondary cover; It also includes a third-stage cover, which is covered outside the second-stage cover. The lower end of the third-stage cover is sealed and fixed with the closure device, and the upper end of the third-stage cover is sealed and fixed with the first-stage cover.

[0011] Preferably, dust rings are fixedly installed at positions of the first-level cover corresponding to the positions through which the auxiliary push rods pass.

[0012] Preferably, the outer wall of the three-stage cover is provided with two detachable protection plates, which are magnetically attracted to the outer wall of the three-stage cover and remain flush with the outer wall, and the outer walls of the bottom ends of the protection plates are provided with friction grooves.

[0013] Preferably, the manual operation unit includes a tooth plate, a gear and a manual operation rod, the tooth plate and the gear are both installed on the bottom side of the first-stage cover, the tooth plate is connected to it for sliding up and down, the gear is connected to it for rotation, the gear is engaged with the tooth plate, and the lower end of the manual operation rod is fixed to the gear main shaft for controlling the rotation of the gear, and a pin shaft is fixedly installed on the outer wall of the secondary cover corresponding to the upper end of the tooth plate, and when the tooth plate moves up, the pin shaft can be pushed to lift the secondary cover.

[0014] Preferably, an elastic power-off trigger is installed on the outer wall of the secondary cover corresponding to the manual operating rod, which can be extended to push the manual operating rod after power is cut off.

[0015] Preferably, the manual operating rod corresponds to the protection plate, and when the elastic power-off trigger pushes the manual operating rod, the manual operating rod can push the protection plate open.

[0016] Preferably, the reversing valve body includes a valve body and a pilot chamber, the pilot hole is arranged at the bottom of the pilot chamber, the closer is sealed and fixed above the pilot chamber, a cavity is formed between the closer and the pilot chamber, the lower end of the valve stem is in the closer and the pilot chamber, the valve stem is connected to the bottom of the pilot chamber by a spring, and when the valve stem is not subjected to the suction of the electromagnet, the spring can make the bottom of the valve stem close to the pilot hole, which is used to seal the pilot hole.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The improved electromagnetic pilot valve for mining is equipped with a multi-stage protection unit. The electromagnet and the valve stem are protected by a first-stage cover, a second-stage cover, and a third-stage cover. There are multiple protection layers. Therefore, in the harsh environment of the coal mine, dust is not easily introduced into the valve stem. Even when emergency manual operation is required, the manual operating lever is protected by the third-stage cover and the protection plate and is not affected by coal dust. The operation is smooth and not easy to get stuck. Therefore, compared with the existing technology, it protects both the manual operation unit and the electromagnetic pilot unit.

[0018] 2. The improved electromagnetic pilot valve for mining is provided with a manual operating unit. Under normal operation, the manual operating lever is in a hidden state. The protective plate is responsible for protecting the manual operating lever to prevent coal dust from entering the position of the manual operating lever. In the event of a power outage, the manual operating lever will move out of the three-stage cover, so that quick operation can be achieved. If the existing technology wants to protect the manual operating lever, the manual operating lever will inevitably be difficult to operate. The present application can both quickly operate and well protect the mechanical unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a cross-sectional view of the structure of the present invention; Figure 3 It is a structural schematic diagram of the electromagnetic pilot assembly of the present invention; Figure 4 It is a structural schematic diagram of the electromagnetic pilot unit of the present invention; Figure 5 This is a diagram showing the internal structure of the electromagnetic pilot unit of the present invention; Figure 6 For the present invention Figure 5 A magnified view of the structure at point A; Figure 7 For the present invention Figure 5 A magnified view of the structure at B in the middle; Figure 8 This is a schematic diagram of the structure of the first-level cover and the second-level cover of the present invention; Figure 9 This is a structural diagram of the first-stage cover and the electromagnet of the present invention; Figure 10 It is a structural schematic diagram of the electromagnet and valve stem of the present invention.

[0020] In the picture: 1. Reversing valve body; 101. Valve body; 102. Pilot chamber; 2. Electromagnetic pilot assembly; 201. Electromagnetic pilot unit; 2011, electromagnet; 2012, valve stem; 2013, closure; 2014, auxiliary ejector; 202. Manual operation unit; 2021, tooth plate; 2022, gear; 2023, manual operating lever; 2024, pin; 203, multi-level protection unit; 2031. First-stage cover; 2032. Second-stage cover; 2033. Elastic sealing cover; 2034. Third-stage cover; 2035. Dustproof ring; 2036. Protection plate; 2037. Friction groove; 2038. Elastic power-off trigger. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0022] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0023] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0025] like Figure 1-10 As shown, an improved electromagnetic pilot valve for mining includes a reversing valve body 1 and an electromagnetic pilot assembly 2. The electromagnetic pilot assembly 2 includes an electromagnetic pilot unit 201, a manual operation unit 202 and a multi-stage protection unit 203. The electromagnetic pilot unit 201 is installed on the reversing valve body 1 and is used to control the opening and closing of the pilot hole. The multi-stage protection unit 203 is installed on the reversing valve body 1. The electromagnetic pilot unit 201 and the manual operation unit 202 are both inside the multi-stage protection unit 203. The manual operation unit 202 is used to manually control the opening and closing of the pilot hole by the electromagnetic pilot unit 201. The multi-stage protection unit 203 is used to seal and protect the electromagnetic pilot unit 201.

[0026] The solenoid pilot valve consists of a main valve section and a pilot control section. The main valve section is the directional valve body 1, while the pilot control section is the solenoid pilot assembly 2. The main valve section includes the main valve core: a large valve core driven by pilot pressure that directly controls the main oil flow. The main valve spring is used to reset the main valve or maintain the default normally open / closed state. The damping orifice / throttle orifice balances pressure and prevents oscillation caused by excessively rapid main valve movement.

[0027] The main valve core of the reversing valve body 1 adopts a poppet-type structure with a conical surface seal, suitable for high-pressure relief valves or check valves, and has excellent sealing performance. The operating principle is that the pilot valve sets the pressure. When the system pressure exceeds the set value, the pilot valve opens, and oil flows through the damping orifice. The pressure differential across the main valve core causes it to open and release pressure.

[0028] The current manual control device of the electromagnetic pilot valve generally directly drives the internal solenoid valve. Direct drive is bound to have a mechanical connection. The mechanical connection is easy to enter coal powder and moisture when running in the coal mine. Therefore, if it is not used for a long time under harsh conditions, the manual control device is likely to get stuck or become difficult to control.

[0029] In an optional embodiment, the electromagnetic pilot unit 201 includes an electromagnet 2011, a valve stem 2012, a closer 2013 and an auxiliary push rod 2014. The closer 2013 is connected to the reversing valve body 1. The valve stem 2012 passes through the closer 2013 and is sealed and slidably connected thereto. There are multiple auxiliary push rods 2014, all of which are fixed around the outside of the valve stem 2012. The electromagnet 2011 is suspended above the valve stem 2012, and the electromagnet 2011 can adsorb the valve stem 2012 and move it upward.

[0030] In this embodiment, the closer 2013 can replace the structure near the pilot hole on the traditional main valve. The closer 2013 can be removed from the reversing valve body 1 and is suitable for later modular use. When the closer 2013 is installed on the main valve, it mainly forms a cavity for pilot pressure relief.

[0031] In an optional embodiment, the multi-stage protection unit 203 includes a first-stage cover 2031, which is fixedly sealed above the closure 2013. The upper end of the valve stem 2012 and the lower end of the electromagnet 2011 are both located in a cavity between the first-stage cover 2031 and the closure 2013. The electromagnet 2011 is sealed and fixed to the upper end of the first-stage cover 2031. The upper ends of the auxiliary push rods 2014 pass through the first-stage cover 2031 and are sealed and slidably connected thereto. The secondary cover 2032 is covered on the outside of the primary cover 2031. The upper and lower ends of the secondary cover 2032 are sealed with the primary cover 2031 by elastic sealing covers 2033. The upper end of the auxiliary push rod 2014 is fixed to the inner top wall of the secondary cover 2032. It also includes a third-stage cover 2034, which is covered on the outside of the second-stage cover 2032. The lower end of the third-stage cover 2034 is sealed and fixed to the closure 2013, and the upper end of the third-stage cover 2034 is sealed and fixed to the first-stage cover 2031.

[0032] In this embodiment, the first-level cover 2031 is responsible for directly protecting the valve stem 2012. The main up and down movement of the valve stem 2012 is always within the first-level cover 2031. The auxiliary push rod 2014 is a component that moves synchronously with the valve stem 2012. The upper end movement of the auxiliary push rod 2014 is outside the first-level cover 2031.

[0033] The secondary cover 2032 is concentrically arranged with the primary cover 2031. Since the secondary cover 2032 is provided with an elastic sealing cover 2033, no matter how the secondary cover 2032 moves up and down, the elastic sealing cover 2033 separates its interior from the outside world, and the outside air, dust and moisture will not enter the secondary cover 2032.

[0034] The third-stage cover 2034 is concentrically covered on the outside of the second-stage cover 2032, so the elastic sealing cover 2033 connected to the second-stage cover 2032 is basically not affected by external corrosive gases and corrosive moisture. Therefore, the valve stem 2012 has three more layers of protection compared to the existing technology.

[0035] In an optional embodiment, dust rings 2035 are fixedly installed at the positions of the first-stage cover 2031 corresponding to the positions where the auxiliary push rods 2014 pass through.

[0036] In this embodiment, the dustproof ring 2035 can isolate the dust in the sliding component. An oil scraper ring is also provided inside the dustproof ring 2035, which mainly plays the role of lubrication and isolation of dust.

[0037] In an optional embodiment, the outer wall of the third-stage cover 2034 is provided with two detachable protective plates 2036, which are magnetically attracted to the outer wall of the third-stage cover 2034 and remain flush with its outer wall. The outer wall of the bottom end of the protective plate 2036 is provided with a friction groove 2037.

[0038] In this embodiment, a through groove with the same shape as the protective plate 2036 is provided on the outer wall of the third-stage cover 2034, and a magnetic boss is provided at the rear end of the through groove. The protective plate 2036 is adsorbed by the boss when it is placed into the through groove, and the protective plate 2036 is flush with the outer wall of the third-stage cover 2034 after being placed into the through groove. The friction groove 2037 is provided on the protective plate 2036 to achieve the effect of manually removing and installing the protective plate 2036.

[0039] In an optional embodiment, the manual operation unit 202 includes a tooth plate 2021, a gear 2022 and a manual operation rod 2023. The tooth plate 2021 and the gear 2022 are both installed on the bottom side of the first-stage cover 2031. The tooth plate 2021 is connected to it for sliding up and down, and the gear 2022 is connected to it for rotation. The gear 2022 is engaged with the tooth plate 2021. The lower end of the manual operation rod 2023 is fixed to the main shaft of the gear 2022 for controlling the rotation of the gear 2022. The outer wall of the second-stage cover 2032 is fixedly installed with a pin shaft 2024 corresponding to the upper end of the tooth plate 2021. When the tooth plate 2021 moves upward, it can push the pin shaft 2024 to lift the second-stage cover 2032.

[0040] In this embodiment, the tooth plate 2021 is sleeved with a sliding sleeve connected to the bottom side of the first cover 2031, the tooth plate 2021 and the sliding sleeve are oiled, the upper end of the tooth plate 2021 is provided with a groove corresponding to the pin shaft 2024, when the tooth plate 2021 rises, the pin shaft 2024 can enter the groove, when the manual operating rod 2023 is upward, there is a gap distance between the tooth plate 2021 and the pin shaft 2024, the gear 2022 rotates with resistance, which can make the manual operating rod 2023 hover at a fixed position.

[0041] In an optional embodiment, the outer wall of the second cover 2032 is provided with an elastic power-off trigger 2038 corresponding to the manual operating rod 2033, which can extend to push the manual operating rod 2023 after power-off.

[0042] In this embodiment, the elastic power-off trigger 2038 uses the elastic potential energy stored by the spring to release energy when power-off, drive the mechanical components to act, and the action is to extend the inner core, which can push the manual operating rod 2023 when extending.

[0043] In an optional embodiment, the manual operating rod 2023 corresponds to the protection plate 2036, when the elastic power-off trigger 2038 pushes the manual operating rod 2023, the manual operating rod 2023 can push open the protection plate 2036.

[0044] In this embodiment, the manual operating rod 2023 is attached to the protection plate 2036, and when the manual operating rod 2023 moves slightly by a certain angle, the protection plate 2036 is opened.

[0045] In an optional embodiment, the reversing valve body 1 includes a valve body 101 and a pilot chamber 102, a pilot hole is provided at the bottom of the pilot chamber 102, a closure 2013 is sealed and fixed above the pilot chamber 102, a cavity is formed between the closure 2013 and the pilot chamber 102, the lower end of the valve rod 2012 is in the closure 2013 and the pilot chamber 102, the valve rod 2012 is connected to the bottom of the pilot chamber 102 by a spring, when the valve rod 2012 is not affected by the attraction of the electromagnet 2011, the spring can make the bottom of the valve rod 2012 tightly adhere to the pilot hole for sealing the pilot hole.

[0046] In this embodiment, the pilot chamber 102 and the closure 2013 can constitute a modular assembly, which is convenient to disassemble from the main valve.

[0047] Working principle During normal use: when the valve needs to be opened, the electromagnet 2011 is energized to attract the valve stem 2012 to move upward. At this time, the pilot hole is opened, and the pressure above the main valve core is less than the pressure below it, so the main valve core will gradually open. When closing the valve, the electromagnet 2011 is de-energized. Under the influence of the spring, the valve stem 2012 will move downward to close the pilot hole. At this time, the pressure above the main valve core begins to be greater than the pressure below it, so the main valve core will gradually close. Under the influence of pressure, the main valve core will gradually achieve complete sealing. When the power is off: After the power is off, the core shaft of the elastic power-off trigger 2038 will be affected by the internal spring and extend from the inside out, thereby changing its length, so that the manual operating rod 2023 can be pushed. When the manual operating rod 2023 is pressed, it will open outward. At this time, the movement of the toothed plate 2021 has not yet contacted the pin 2024. Until the manual operating rod 2023 opens and pushes the protective plate 2036 off the third-stage cover 2034, the manual operating rod 2023 is exposed outside the third-stage cover 2034. Manual operation: Manually press the two manual operating levers 2023, at this time the gear 2022 will engage the tooth plate 2021 to move upward, the tooth plate 2021 gradually pushes the pin shaft 2024, and then the pin shaft 2024 moves up with the secondary cover 2032. When the secondary cover 2032 moves upward, it drives the valve stem 2012 to move upward through the auxiliary push rod 2014, thereby slowly opening the pilot hole. After the pilot hole is opened, the above-mentioned functions during normal use can be realized.

[0048] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0049] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An improved electromagnetic pilot valve for mining, comprising a reversing valve body (1) and an electromagnetic pilot assembly (2), characterized in that: The electromagnetic pilot assembly (2) comprises an electromagnetic pilot unit (201), a manual operation unit (202) and a multi-stage protection unit (203); the electromagnetic pilot unit (201) is mounted on the reversing valve body (1) and is used to control the opening and closing of the pilot hole; the multi-stage protection unit (203) is mounted on the reversing valve body (1); the electromagnetic pilot unit (201) and the manual operation unit (202) are both located inside the multi-stage protection unit (203); the manual operation unit (202) is used to manually control the opening and closing of the pilot hole by the electromagnetic pilot unit (201); and the multi-stage protection unit (203) is used to seal and protect the electromagnetic pilot unit (201).

2. The improved electromagnetic pilot valve for mining according to claim 1 is characterized in that: The electromagnetic pilot unit (201) comprises an electromagnet (2011), a valve stem (2012), a closer (2013) and an auxiliary push rod (2014); the closer (2013) is connected to the reversing valve body (1); the valve stem (2012) passes through the closer (2013) and is sealed and slidably connected thereto; a plurality of auxiliary push rods (2014) are provided, all of which are fixed around the outside of the valve stem (2012); the electromagnet (2011) is suspended above the valve stem (2012); and the electromagnet (2011) can adsorb the valve stem (2012) and move it upward.

3. The improved electromagnetic pilot valve for mining according to claim 2 is characterized in that: The multi-stage protection unit (203) comprises a first-stage cover (2031), the first-stage cover (2031) is fixedly sealed above the closure (2013), the upper end of the valve stem (2012) and the lower end of the electromagnet (2011) are both located in a cavity between the first-stage cover (2031) and the closure (2013), the electromagnet (211) is sealed and fixed to the upper end of the first-stage cover (2031), and the upper end of the auxiliary push rod (2014) passes through the first-stage cover (2031) and is sealed and slidably connected thereto; It also includes a secondary cover (2032) that covers the outside of the primary cover (2031). The upper and lower ends of the secondary cover (2032) are sealed with the primary cover (2031) using elastic sealing covers (2033). The upper end of the auxiliary push rod (2014) is fixed to the inner top wall of the secondary cover (2032). It also includes a third-stage cover (2034) which is covered outside the second-stage cover (2032). The lower end of the third-stage cover (2034) is sealed and fixed to the closure (2013), and the upper end of the third-stage cover (2034) is sealed and fixed to the first-stage cover (2031).

4. The improved electromagnetic pilot valve for mining according to claim 3 is characterized in that: Dustproof rings (2035) are fixedly mounted on the first-stage cover (2031) at positions corresponding to those through which the auxiliary ejector rod (2014) passes.

5. The improved electromagnetic pilot valve for mining according to claim 4 is characterized in that: The outer wall of the three-stage cover (2034) is provided with two detachable protective plates (2036), the protective plates (2036) are magnetically attracted to the outer wall of the three-stage cover (2034) and remain flush with the outer wall, and the outer walls of the bottom ends of the protective plates (2036) are each provided with a friction groove (2037).

6. The improved electromagnetic pilot valve for mining according to claim 5, characterized in that: The manual operation unit (202) comprises a tooth plate (2021), a gear (2022) and a manual operation lever (2023); the tooth plate (2021) and the gear (2022) are both mounted on the bottom side of the first-stage cover (2031); the tooth plate (2021) is connected to the first-stage cover (2031) in an upward and downward sliding manner; the gear (2022) is connected to the first-stage cover (2031) in a rotational manner; the gear (2022) is meshed with the tooth plate (2021); the lower end of the manual operation lever (2023) is fixed to the main shaft of the gear (2022) and is used to control the rotation of the gear (2022); a pin shaft (2024) is fixedly mounted on the outer wall of the second-stage cover (2032) corresponding to the upper end of the tooth plate (2021); when the tooth plate (2021) moves upward, the pin shaft (2024) can be pushed up to lift the second-stage cover (2032).

7. The improved electromagnetic pilot valve for mining according to claim 6, characterized in that: An elastic power-off trigger (2038) is installed on the outer wall of the secondary cover (2032) at a position corresponding to the manual operating rod (2023), and can extend to push the manual operating rod (2023) after power failure.

8. The improved electromagnetic pilot valve for mining according to claim 7 is characterized in that: The manual operating rod (2023) corresponds to the protection plate (2036), and when the elastic power-off trigger (2038) pushes the manual operating rod (2023), the manual operating rod (2023) can push open the protection plate (2036).

9. The improved electromagnetic pilot valve for mining according to claim 1, characterized in that: The reversing valve body (1) comprises a valve body (101) and a pilot cavity (102); a pilot hole is provided at the bottom of the pilot cavity (102); a closer (2013) is sealed and fixed above the pilot cavity (102); a cavity is formed between the closer (2013) and the pilot cavity (102); the lower end of the valve stem (2012) is located between the closer (2013) and the pilot cavity (102); the valve stem (2012) is connected to the bottom of the pilot cavity (102) by a spring; when the valve stem (2012) is not subjected to suction from the electromagnet (211), the spring can make the bottom of the valve stem (2012) close to the pilot hole, thereby sealing the pilot hole.

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