Interlocking proportional mining intrinsic safety electromagnetic pilot valve

Abstract

The invention relates to an interlocking proportional mining intrinsic safety electromagnetic pilot valve, and belongs to the technical field of coal mine hydraulic control. Comprising a shell, two sets of electromagnets in bilateral symmetry are arranged on the upper side in the shell, armatures of the two sets of electromagnets are each fixedly provided with a vertical push rod, two sets of pilot valve elements in bilateral symmetry are arranged on the lower side in the shell, a working cavity is formed in the middle of the inner side of the shell, and the lower ends of the two push rods extend downwards into the working cavity. The upper ends of ejector rods of the two groups of pilot valve cores extend upwards into the working cavity, the lower ends of two push rods are respectively connected with the upper end of the ejector rod on the other side through a lever, an interlocking mechanism is arranged in the working cavity, the interlocking mechanism comprises a locking rod which is arranged in a sliding manner, and two ends of the locking rod are respectively provided with a group of inclined holes; two actuating rods which are horizontal in the front-back direction are fixedly arranged on the two push rods respectively, and the two actuating rods are inserted into the two sets of inclined holes respectively; the problems that an existing electromagnetic pilot valve is prone to being triggered by mistake and insufficient in control precision are solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal mine hydraulic control, and particularly relates to an interlocking proportional mine intrinsic safety electromagnetic pilot valve. BACKGROUND

[0002] The electromagnetic pilot valve is a main component of an electro-hydraulic control reversing valve, and is usually used to control a two-position three-way directional valve in the field of coal mines, so as to realize functions such as lifting and stretching of a support by controlling extension and retraction of a corresponding oil cylinder. The existing electromagnetic pilot valve has the following defects: (1) Safety hazard in operation: the control panel button or the manual button is prone to causing misoperation (double key triggering at the same time) to cause misoperation of the support and lead to equipment damage or personnel injury; (2) Insufficient control precision: the oil cylinder movement can only realize constant speed, and the initial start impact is large, which damages connecting parts such as the trunnion and the equipment, and the support posture cannot be accurately adjusted; although the traditional electromagnetic pilot valve can realize flow regulation, the complex structure leads to response lag and control fluctuation, thereby reducing support precision and increasing failure rate of associated devices such as the scraper conveyor and the support. SUMMARY

[0003] The present application overcomes the shortcomings of the prior art and provides an interlocking proportional mine intrinsic safety electromagnetic pilot valve, which solves the problems of easy misoperation and insufficient control precision of the existing electromagnetic pilot valve.

[0004] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme.

[0005] An interlocking proportional mine intrinsic safety electromagnetic pilot valve comprises a shell, two groups of electromagnets symmetrically arranged on the upper side inside the shell, a vertical push rod fixedly arranged on the armature of each group of electromagnets, two groups of pilot valve cores symmetrically arranged on the lower side inside the shell, a working cavity arranged on the inner side of the shell, the lower ends of the two push rods extending into the working cavity, the upper ends of the top rods of the two groups of pilot valve cores extending into the working cavity, the lower end of each push rod being connected to the upper end of the top rod on the other side through a lever, and an interlocking mechanism arranged in the working cavity, the interlocking mechanism comprising a lock rod slidingly arranged and having a group of inclined holes arranged at each end of the lock rod.

[0006] Further, the upper shell, the lower shell and the fixed seat are arranged, the upper shell is arranged at the upper end of the lower shell, the working cavity is arranged at the upper end face of the lower shell, an installation groove is arranged on one side of the upper end face of the lower shell, and the fixed seat is arranged in the installation groove; the two groups of electromagnets are fixedly arranged in the upper shell, and the two groups of pilot valve cores are fixedly arranged in the lower shell.

[0007] Further, a sliding seat is fixedly arranged on the outer side of the fixed seat and extends into the working cavity; a sliding groove is arranged on the side end face of the sliding seat away from the fixed seat; the lock rod is slidingly arranged in the sliding groove; and an upright elastic rod is fixedly arranged in the sliding groove and is inserted into the middle part of the lock rod.

[0008] Further, an avoiding groove is arranged at each end of the lock rod, and a slant hole is arranged on the front and back sides of each avoiding groove; the slant holes on the two sides are symmetrically arranged, and the upper ends of the slant holes on the two sides are close to each other and the lower ends of the slant holes on the two sides are away from each other.

[0009] Further, the two push rods slide downward through the sliding seat and are located in the avoiding grooves at the two ends of the lock rod respectively, and the action rods on each push rod are inserted into the slant holes on the front and back sides of the same side avoiding groove, and the action rods are located in the middle part of the slant holes.

[0010] Further, the two levers are a first lever and a second lever, and the first lever and the second lever are horizontally arranged along the left-right direction and are located below the lock rod.

[0011] Further, the left end of the first lever is hingedly connected to the left inner wall of the working cavity, and the right end of the first lever is connected to the lower end of the left push rod; and the right end of the second lever is hingedly connected to the right inner wall of the working cavity, and the left end of the second lever is connected to the lower end of the right push rod.

[0012] Further, the upper end of the top rod of the left pilot valve core is in contact with the left side of the lower end face of the first lever, and the upper end of the top rod of the right pilot valve core is in contact with the right side of the lower end face of the second lever.

[0013] Further, a front-rear through waist-shaped groove is arranged in the middle part of the lock rod, and a left-right extending driven rack is fixedly arranged at the inner bottom face of the waist-shaped groove.

[0014] Further, a driving motor is fixedly arranged in the fixed seat, a driving gear is fixedly arranged on the output shaft of the driving motor, and the driving gear is located in the waist-shaped groove of the fixed seat and is engaged with the driven rack.

[0015] The beneficial effects of the present application relative to the prior art are: (1) By means of the ingenious slant hole-action rod mechanical structure, when a single electromagnet is powered to trigger a side pilot valve core, the valve core on the other side is forced to be locked in the untriggered state. This interlocking mechanism completely eliminates the possibility of simultaneous triggering of the two pilot valve cores due to misoperation or signal interference from the physical layer, greatly improving the safety and reliability of the system in high-risk environments such as mining.

[0016] (2) The proportional adjusting mechanism driven by servo motor, gear and rack is innovatively integrated. By precisely controlling the steering and rotation angle of the motor, the lock rod can be linearly moved, so as to realize stepless and proportional accurate control of the opening of the single-sided pilot valve core. This meets the higher requirement of modern hydraulic system for fine adjustment of flow or pressure.

[0017] (3) When the two electromagnets are accidentally powered at the same time, the forces of the two push rods will cancel each other on the lock rod, so that it cannot be moved. At this time, the push rods on both sides are locked, and the lever cannot be pressed down, so as to ensure that the valve cores on both sides cannot be triggered, and another important safety protection is provided.

[0018] (4) The built-in elastic rod can automatically push the lock rod back to the center position after the electromagnet is powered off, drive the entire mechanism to reset, and make the pilot valve cores on both sides return to the untriggered state. This design ensures the stability and ready state of the valve, and the reset can be completed without additional control.

[0019] (5) The functions of electromagnetic drive, mechanical interlocking and proportional adjustment are highly integrated in the valve body, and the structure design is compact and the layout is reasonable.

[0020] (6) As a mine intrinsic safety device, the design meets the explosion-proof safety requirements, and is especially suitable for use in explosive dangerous environments such as coal mines, so as to ensure the safe operation in harsh working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0021] The application will be further described in detail below with reference to the drawings: Figure 1 is a structure schematic diagram of the whole application Figure One ; Figure 2 is a structure schematic diagram of the whole application Figure Two ; Figure 3 is a three-dimensional schematic diagram of the shell after half cutaway; Figure 4 is a front view of the shell after half cutaway; Figure 5 is a structure schematic diagram of the application after removing the shell Figure One ; Figure 6 is a structure schematic diagram of the application after removing the shell Figure Two ; Figure 7 is a structure schematic diagram of the interlocking mechanism Figure One ; Figure 8 is a structure schematic diagram of the interlocking mechanism Figure Two ; Figure 9 is a connection schematic diagram of the first lever, the second lever and the push rod; Figure 10 This is a diagram illustrating the connection between the locking rod and the push rod. Figure One ; Figure 11 This is a schematic diagram showing the connection between the locking rod, the push rod, and the sliding seat; Figure 12 This is a diagram illustrating the connection between the locking rod and the push rod. Figure Two ; Among them, 1 is the upper housing, 2 is the lower housing, 3 is the fixed seat, 4 is the electromagnet, 5 is the pilot valve core, 6 is the working chamber, 7 is the push rod, 8 is the top rod, 9 is the locking rod, 10 is the oblique hole, 11 is the actuating rod, 12 is the sliding seat, 13 is the elastic rod, 14 is the clearance groove, 15 is the first lever, 16 is the second lever, 17 is the hinge shaft, 18 is the drive motor, 19 is the driven rack, and 20 is the driving gear. Detailed Implementation

[0022] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0023] like Figure 1 As shown in Figure 12, this invention provides an interlocking proportional intrinsically safe electromagnetic pilot valve for mining, comprising a housing, two sets of symmetrically arranged electromagnets 4 on the upper side inside the housing, each set of electromagnets 4 having a vertical push rod 7 fixedly mounted on its armature, two sets of symmetrically arranged pilot valve cores 5 on the lower side inside the housing, and a working chamber 6 in the middle of the inner side of the housing. The lower ends of the two push rods 7 extend downward into the working chamber 6, and the upper ends of the top rods 8 of the two sets of pilot valve cores 5 extend upward into the working chamber 6. The lower ends of the two push rods 7 are respectively connected to the upper ends of the top rods 8 on the other side through a lever. An interlocking mechanism is provided inside the working chamber 6, the interlocking mechanism including a slidably arranged locking rod 9, each end of the locking rod 9 having a set of inclined holes 10; and a horizontally arranged actuating rod 11 is fixedly mounted on each of the two push rods 7, the two actuating rods 11 being inserted into the two sets of inclined holes 10 respectively.

[0024] The upper housing 1, lower housing 2, and fixing base 3 are described. The upper housing 1 is located at the upper end of the lower housing 2 and is fixedly connected to the lower housing 2 by two bolts. The working cavity 6 is located at the upper end face of the lower housing 2. A mounting groove is provided on one side of the upper end face of the lower housing 2, and the fixing base 3 is located in the mounting groove and is fixedly connected to the lower housing 2 by four locking screws.

[0025] Two groups of electromagnet 4 are fixedly arranged inside the upper shell 1, and two groups of pilot valve core 5 are fixedly arranged inside the lower shell 2.

[0026] A sliding seat 12 is fixedly arranged on the outer side of the fixed seat 3 and extends into the working cavity 6. A horizontal sliding groove is arranged on the side end face of the sliding seat 12 away from the fixed seat 3, and the lock rod 9 is arranged in the sliding groove in the left-right direction. An elastic rod 13 is fixedly arranged in the sliding groove in the vertical direction, and the elastic rod 13 is inserted into the middle part of the lock rod 9. When the lock rod 9 slides in the left-right direction under the action of external force, the elastic rod 13 can assist the lock rod 9 to return to the middle position of the sliding groove after the external force disappears.

[0027] The lock rod 9 is a horizontally arranged square rod structure, and the length direction of the lock rod 9 is horizontally arranged in the left-right direction. An avoiding groove 14 is arranged at each end of the lock rod 9, and an inclined hole 10 is arranged on the front and back of each avoiding groove 14. The two inclined holes 10 are symmetrically arranged, and the upper ends of the two inclined holes 10 are close to each other and the lower ends are away from each other.

[0028] The two levers are a first lever 15 and a second lever 16, and the first lever 15 and the second lever 16 are horizontally arranged in the left-right direction and located below the lock rod 9. The left end of the first lever 15 is hingedly connected to the left inner wall of the working cavity 6 through a front-rear horizontal hinge shaft 17, and the right end of the first lever 15 is connected to the lower end of the right push rod 7. The right end of the second lever 16 is hingedly connected to the right inner wall of the working cavity 6 through a front-rear horizontal hinge shaft 17, and the left end of the second lever 16 is connected to the lower end of the left push rod 7. The two hinge shafts 17 are located outside the top rods 8 of the two groups of pilot valve cores 5. The upper end of the top rod 8 of the left pilot valve core 5 is in contact with the left side of the lower end face of the first lever 15, and the upper end of the top rod 8 of the right pilot valve core 5 is in contact with the right side of the lower end face of the second lever 16.

[0029] The two push rods 7 slide downward through the sliding seat 12 and are located in the avoiding grooves 14 at the two ends of the lock rod 9, and the action rods 11 on the two push rods 7 are respectively inserted into the inclined holes 10 on the front and back of the same side avoiding groove 14, and the action rods 11 are located in the middle part of the inclined holes 10.

[0030] The interlocking mechanism further comprises a driving motor 18, a driving gear 20 and a driven rack 19. A waist-shaped slot is arranged in the middle of the lock rod 9, and the length direction of the waist-shaped slot is horizontally arranged along the left-right direction. A left-right extending driven rack 19 is fixedly arranged at the inner bottom surface of the waist-shaped slot. A driving motor 18 is fixedly arranged in the fixed seat 3, and the driving motor 18 is a servo motor. The output shaft of the driving motor 18 is horizontally arranged along the front-rear direction, and a driving gear 20 is fixedly arranged on the output shaft of the driving motor 18. The driving gear 20 is located in the waist-shaped slot of the fixed seat 3 and is engaged with the driven rack 19.

[0031] The working principle of the present application is as follows: When the present application is in the non-working state, the push rods 7 of the two groups of electromagnets 4 are in the state of not extending downward. At this time, the action rods 11 on the two push rods 7 are located at the middle positions of the two groups of inclined holes 10 respectively, the lock rod 9 is located at the middle position of the sliding slot, the first lever 15 and the second lever 16 are both in the horizontal state and do not exert downward pressure on the top rods 8 of the two groups of pilot valve spools 5, and the two groups of pilot valve spools 5 are both in the non-triggering state.

[0032] When the left pilot valve spool 5 needs to be triggered, the right electromagnet 4 is controlled to be powered on, so that the right push rod 7 slides downward. The right push rod 7 drives the right end of the first lever 15 to rotate downward around the left hinge shaft 17. The lower end surface of the first lever 15 starts to exert downward pressure on the upper end of the top rod 8 of the left pilot valve spool 5, so that the top rod 8 of the left pilot valve spool 5 is pressed downward, thereby triggering the left pilot valve spool 5.

[0033] When the right push rod 7 slides downward, the right action rod 11 slides downward, and the right action rod 11 exerts downward pressure on the bottom surface of the right inclined hole 10, so that the lock rod 9 starts to slide leftward in the sliding slot. The right action rod 11 slides to the lower end of the right inclined hole 10. Since the lock rod 9 slides leftward, the bottom surface of the left inclined hole 10 exerts pressure on the left action rod 11, so that the left action rod 11 slides upward and slides to the upper end of the left inclined hole 10. The left action rod 11 drives the left push rod 7 to slide upward, and the left end of the second lever 16 rotates upward around the right hinge shaft 17, so that the second lever 16 moves away from the top rod 8 of the right pilot valve spool 5, thereby ensuring that the right pilot valve spool 5 will not be triggered.

[0034] When the right pilot valve spool 5 needs to be triggered, the left electromagnet 4 is controlled to be powered on, so that the left push rod 7 slides downward. The left push rod 7 drives the left end of the second lever 16 to rotate downward around the right hinge shaft 17. The lower end surface of the second lever 16 starts to exert downward pressure on the upper end of the top rod 8 of the right pilot valve spool 5, so that the top rod 8 of the right pilot valve spool 5 is pressed downward, thereby triggering the right pilot valve spool 5.

[0035] When the left push rod 7 slides down, the left action rod 11 slides down, and the left action rod 11 exerts downward pressure on the bottom surface of the left inclined hole 10, so that the lock rod 9 starts to slide right inside the sliding groove, and the left action rod 11 slides to the lower end of the left inclined hole 10. As the lock rod 9 slides right, the bottom surface of the right inclined hole 10 exerts pressure on the right action rod 11, so that the right action rod 11 slides up and slides to the upper end of the right inclined hole 10, and the right action rod 11 drives the right push rod 7 to slide up, and the right push rod 7 drives the right end of the first lever 15 to rotate upward around the left hinge shaft 17, so that the first lever 15 moves away from the top rod 8 of the left pilot spool 5, thereby ensuring that the left pilot spool 5 will not be triggered.

[0036] Therefore, no matter which side of the pilot spool 5 is triggered, the top rod 8 of the other side of the pilot spool 5 is in a interlocking state and will not be accidentally triggered.

[0037] When the electromagnet 4 is de-energized, the push rod 7 no longer exerts pressure on the lock rod 9 through the action rod 11, and at this time, under the action of the elastic rod 13, the lock rod 9 returns to the middle position inside the sliding groove, and the left and right action rods 11 return to the middle position of the inclined hole 10, and the left and right push rods 7 also return to the initial position, and the left and right pilot spools 5 return to the untriggered state.

[0038] When both groups of electromagnets 4 are energized, the left and right push rods 7 are in a state of sliding down, and the left and right action rods 11 simultaneously exert pressure on the middle part of the bottom surface of the left and right inclined holes 10, and both sides of the lock rod 9 are pushed to the other side, and the two sides of the push force cancel each other out, so that the lock rod 9 will not slide to any side, and the two sides of the push rod 7 will not slide down, meaning that the two sides of the pilot spool 5 will not be triggered, and the simultaneous accidental triggering of the two sides of the pilot spool 5 is physically eliminated.

[0039] When it is necessary to proportionally adjust the opening of one side of the pilot spool 5, the control driving motor 18 starts to rotate.

[0040] When the drive motor 18 rotates in the forward direction, it drives the drive gear 20 to rotate in the forward direction. Since the drive gear 20 meshes with the driven rack 19, it drives the locking rod 9 to slide to the left. The right actuating rod 11 slides downward from the middle position of the right inclined hole 10, and the left actuating rod 11 slides upward from the middle position of the left inclined hole 10, causing the right push rod 7 to slide downward and the left push rod 7 to slide upward. The right push rod 7 drives the right end of the first lever 15 to rotate downward around the left hinge shaft 17. The lower end face of the first lever 15 begins to apply downward pressure to the upper end of the top rod 8 of the left pilot valve core 5, causing the top rod 8 of the left pilot valve core 5 to be pressed down, thereby triggering the left pilot valve core 5. The left push rod 7 drives the left end of the second lever 16 to rotate upward around the right hinge shaft 17, causing the second lever 16 to move away from the top rod 8 of the right pilot valve core 5, thereby ensuring that the right pilot valve core 5 is not triggered. By controlling the rotation angle of the drive motor 18, the distance the locking rod 9 slides to the left is adjusted, thereby adjusting the downward sliding range of the push rod 7 on the right side. This adjusts the downward rotation range of the right end of the first lever 15, which in turn adjusts the downward pressure of the push rod 8 of the pilot valve core 5 on the left side. Finally, the opening of the pilot valve core 5 on the left side is adjusted proportionally.

[0041] When the drive motor 18 rotates in the reverse direction, it drives the drive gear 20 to rotate in the reverse direction. Since the drive gear 20 meshes with the driven rack 19, it drives the locking rod 9 to slide to the right. The left actuating rod 11 slides downward from the middle position of the left inclined hole 10, and the right actuating rod 11 slides upward from the middle position of the right inclined hole 10, causing the left push rod 7 to slide downward and the right push rod 7 to slide upward. The left push rod 7 drives the left end of the second lever 16 to rotate downward around the right hinge shaft 17. The lower end face of the second lever 16 begins to apply downward pressure to the upper end of the top rod 8 of the right pilot valve core 5, causing the top rod 8 of the right pilot valve core 5 to be pressed down, thereby triggering the right pilot valve core 5. The right push rod 7 drives the right end of the first lever 15 to rotate upward around the left hinge shaft 17, causing the first lever 15 to move away from the top rod 8 of the left pilot valve core 5, thereby ensuring that the left pilot valve core 5 is not triggered. By controlling the rotation angle of the drive motor 18, the distance the locking rod 9 slides to the right is adjusted, thereby adjusting the downward sliding range of the push rod 7 on the left side. This, in turn, adjusts the downward rotation range of the left end of the second lever 16, thereby adjusting the downward pressure range of the push rod 8 of the pilot valve core 5 on the right side. Finally, the opening degree of the pilot valve core 5 on the right side is adjusted proportionally.

[0042] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims with respect to the figures of the patent document.

Claims

1. An interlocking proportional intrinsically safe electromagnetic pilot valve for mining applications, characterized in that: The device includes a housing, with two sets of symmetrical electromagnets (4) arranged on the upper side inside the housing. A vertical push rod (7) is fixedly arranged on the armature of each set of electromagnets (4). Two sets of symmetrical pilot valve cores (5) are arranged on the lower side inside the housing. A working chamber (6) is arranged in the middle of the inner side of the housing. The lower ends of the two push rods (7) extend downward into the working chamber (6). The upper ends of the top rods (8) of the two sets of pilot valve cores (5) extend upward into the working chamber (6). The lower ends of the two push rods (7) are connected to the upper ends of the top rods (8) on the other side through a lever. An interlocking mechanism is arranged inside the working chamber (6). The interlocking mechanism includes a sliding locking rod (9). A set of inclined holes (10) are arranged at both ends of the locking rod (9). A horizontal action rod (11) is fixedly arranged on each of the two push rods (7). The two action rods (11) are inserted into the two sets of inclined holes (10).

2. The intrinsically safe electromagnetic pilot valve for mining applications of an interlocking proportional type according to claim 1, characterized in that: The upper housing (1), lower housing (2), and fixed seat (3) are provided. The upper housing (1) is located at the upper end of the lower housing (2). The working chamber (6) is located at the upper end face of the lower housing (2). An installation groove is provided on one side of the upper end face of the lower housing (2). The fixed seat (3) is located at the installation groove. Two sets of electromagnets (4) are fixedly installed inside the upper housing (1), and two sets of pilot valve cores (5) are fixedly installed inside the lower housing (2).

3. The intrinsically safe electromagnetic pilot valve for mining applications of an interlocking proportional type according to claim 2, characterized in that: A sliding seat (12) is fixedly installed on the outer side of the fixed seat (3), and the sliding seat (12) extends into the working cavity (6); a sliding groove is provided on the side end face of the sliding seat (12) away from the fixed seat (3), and the locking rod (9) is slidably installed in the sliding groove; a vertical elastic rod (13) is fixedly installed in the sliding groove, and the elastic rod (13) is inserted into the middle of the locking rod (9).

4. The intrinsically safe electromagnetic pilot valve for mining applications of an interlocking proportional type according to claim 3, characterized in that: A clearance groove (14) is provided at both ends of the locking bar (9), and a slanted hole (10) is provided on the front and back sides of each clearance groove (14); the slanted holes (10) on both sides are symmetrically arranged, with the upper ends of the slanted holes (10) on both sides close to each other and the lower ends far apart from each other.

5. The intrinsically safe electromagnetic pilot valve for mining applications of an interlocking proportional type according to claim 4, characterized in that: Two push rods (7) slide downward through the sliding seat (12) and are located in the clearance grooves (14) at both ends of the locking rod (9). The action rod (11) on each push rod (7) is inserted into the oblique holes (10) on the front and rear sides of the clearance groove (14) on the same side. The action rod (11) is located in the middle of the oblique hole (10).

6. The intrinsically safe electromagnetic pilot valve for mining applications of an interlocking proportional type according to claim 1, characterized in that: The two levers are the first lever (15) and the second lever (16). Both the first lever (15) and the second lever (16) are set horizontally in the left and right direction. Both the first lever (15) and the second lever (16) are located below the locking bar (9).

7. The intrinsically safe electromagnetic pilot valve for mining applications of an interlocking proportional type according to claim 6, characterized in that: The left end of the first lever (15) is hinged to the left inner wall of the working chamber (6), and the right end of the first lever (15) is connected to the lower end of the right push rod (7); the right end of the second lever (16) is hinged to the right inner wall of the working chamber (6), and the left end of the second lever (16) is connected to the lower end of the left push rod (7).

8. The intrinsically safe electromagnetic pilot valve for mining applications of an interlocking proportional type according to claim 7, characterized in that: The upper end of the push rod (8) of the pilot valve core (5) on the left side is in contact with the left side of the lower end face of the first lever (15), and the upper end of the push rod (8) of the pilot valve core (5) on the right side is in contact with the right side of the lower end face of the second lever (16).

9. The intrinsically safe electromagnetic pilot valve for mining applications of an interlocking proportional type according to claim 3, characterized in that: A waist-shaped groove that runs through the front and back is provided in the middle of the locking bar (9), and a driven rack (19) that extends left and right is fixedly provided at the bottom surface inside the waist-shaped groove.

10. The intrinsically safe electromagnetic pilot valve for mining applications of an interlocking proportional type according to claim 9, characterized in that: A drive motor (18) is fixedly installed inside the fixed base (3), and a drive gear (20) is fixedly installed on the output shaft of the drive motor (18). The drive gear (20) is located inside the waist-shaped groove of the fixed base (3) and meshes with the driven rack (19).

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