A separate explosion-proof and intrinsically safe dual power switching control box for mining

Abstract

The present invention discloses a separate type explosion-proof and intrinsically safe dual power switching control box for mining, which relates to the technical field of control boxes, and comprises a box body, wherein a terminal block is installed inside the box body, and a protection box is matched on the terminal block; both upper and lower ends of the terminal block are provided with wiring posts, and the wiring posts have a wire clamping groove for the wire to pass through, and a pressing block for squeezing the wire is slidably provided inside the wire clamping groove; the wire passes through the wire clamping groove, and when the protection box is closed on the terminal block, the protection box drives the pressing block to squeeze and position the wire. The separate type explosion-proof and intrinsically safe dual power switching control box for mining can squeeze and position multiple wires at the same time by providing structures such as a terminal block, a protection box and wiring posts, and the wires are automatically bent and wound around the wiring posts, and the contact area between the wires and the wiring posts can also be expanded, so that the electrical connection is more firm, and the use efficiency of the separate type explosion-proof and intrinsically safe dual power switching control box for mining is improved.

Description

Technical Field

[0001] The invention relates to the technical field of control boxes, and in particular to a separate type mine-used flameproof and intrinsically safe dual-power switching control box. Background Art

[0002] The shell of mining explosion-proof control box is mostly made of steel plate welding or cast aluminum alloy or stainless steel die-casting, and the surface is sprayed with high-voltage electrostatic spray. The whole product generally adopts a composite structure composed of flameproof shell and intrinsically safe shell. The control box includes instruments, wiring terminals and other structures.

[0003] In the prior art, the wiring terminals of the explosion-proof control box for mines are usually fixed by a row of parallel screws. This fixing method requires tightening the screws of the fixed terminals one by one, which is not only time-consuming and labor-intensive, affecting the wiring efficiency, but also may cause the screws to become loose due to insufficient tightening due to improper operation of the staff, making it easy for the wiring terminals to have poor contact or even fail during use, affecting the effective and stable operation of the explosion-proof control box for mines.

[0004] Therefore, it is necessary to propose a separate mining flameproof and intrinsically safe dual power switching control box to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a split-type explosion-proof and intrinsically safe dual power supply switching control box for mining, so as to solve the problem in the prior art that the wiring terminals of the mining explosion-proof control box are usually fixed by a row of parallel screws. This fixing method requires tightening the screws of the fixed terminals one by one, which is not only time-consuming and labor-intensive, affecting the wiring efficiency, but also may cause the screws to become loose due to insufficient tightening due to improper operation of the staff, thereby making it easy for the wiring terminals to have poor contact or even fail during use, affecting the effective and stable operation of the mining explosion-proof control box.

[0006] To achieve the above object, the present invention provides the following technical solution: a separate type mine flameproof and intrinsically safe dual power supply switching control box, comprising a box body, a terminal block is installed inside the box body, and a protection box is matched on the terminal block;

[0007] The upper and lower ends of the terminal block are both provided with terminal posts, the terminal posts are provided with wire clamping grooves for the wires to pass through, and a pressing block for squeezing the wires is slidably provided inside the wire clamping grooves;

[0008] The wire passes through the wire clamping slot. When the protection box is closed on the terminal block, the protection box drives the pressing block to squeeze and position the wire, and the terminal is squeezed and rotated, so that the wire is wrapped around the terminal to prevent it from falling off.

[0009] Preferably, a threaded hole matching with the thread of the terminal post is provided on the terminal block, a contraction groove is provided inside the threaded hole, the terminal post extends into the contraction groove, and a second spring is provided inside the contraction groove.

[0010] Preferably, an electric contact piece is fixedly embedded on the side wall of the shrinkage groove, and the terminal is matched with the electric contact piece.

[0011] Preferably, a sliding hole is provided at one end of the terminal near the pressure block, a sliding column is slidably arranged inside the sliding hole, the pressure block is fixedly connected to the sliding column, and a rotating block is rotatably connected to the end of the sliding column away from the pressure block, the rotating block abuts against the protection box, and a first spring is sleeved on the outside of the sliding column.

[0012] Preferably, an elastic clip is provided on one side of the terminal post close to the edge of the terminal block, and a limiting block for correspondingly cooperating with the elastic clip is fixedly connected to the inner wall of the protection box.

[0013] Preferably, both upper and lower ends of the protection box are provided with threading grooves for the wires to pass through.

[0014] Preferably, a receiving groove is provided on one side of the wire threading groove facing the terminal block, an airbag is fixedly connected to the interior of the receiving groove, an extrusion component cooperating with the airbag is provided on one side of the receiving groove, and an adjustment component cooperating with the airbag is provided on the other side of the receiving groove.

[0015] Preferably, the extrusion assembly includes a fixed block, a slide groove, a first slide plate, a third spring and a first air hole, the slide groove is arranged on a side of the protective box facing the terminal block, the first air hole is arranged on the inner wall of the slide groove, the slide groove is connected with the airbag through the first air hole, the third spring is located inside the slide groove, one end of the third spring is fixedly connected to the first slide plate, one end of the third spring is fixedly connected to the inner wall of the slide groove, the fixed block is fixedly connected to the terminal block, and the fixed block abuts against the first slide plate.

[0016] Preferably, the adjustment assembly includes an adjustment rod, an inner cavity, a second slide plate, a threaded groove and a second air hole, the inner cavity is opened inside the wall of the protection box, the second air hole is opened on the inner wall of the inner cavity, the inner cavity is connected with the airbag through the second air hole, the second slide plate is slidably arranged inside the inner cavity, the threaded groove is opened on the outer wall of the protection box, the threaded groove is connected with the inner cavity, the adjustment rod is threadedly connected inside the threaded groove, and the second slide plate is rotatably connected to the adjustment rod.

[0017] Preferably, the binding posts are provided in plurality.

[0018] Technical effects and advantages of the present invention:

[0019] 1. The present invention can squeeze and position multiple wires at the same time by arranging structures such as terminal blocks, protection boxes and terminal posts, and the wires are automatically bent and wound around the terminal posts, and the contact area between the wires and the terminal posts can be expanded, making the electrical connection more secure and improving the use efficiency of the separated mining flameproof and intrinsically safe dual power supply switching control box;

[0020] 2. When the protection box is closed on the terminal block, the terminal moves toward the contraction slot and contacts the electrical contact piece to ensure the subsequent power connection. At the same time, the wires are always in the power-off state to pass through the wire slot to avoid safety hazards caused by improper operation of the operator.

[0021] 3. If some of the terminals do not need to be connected to the wires, the terminals will not come into contact with the electric contacts, and the idle terminals will not heat up when they are powered on, thus improving the safety of the separated mining flameproof and intrinsically safe dual power switching control box;

[0022] 4. During the rotation of the terminal, the elastic clamp prevents the wire from swinging randomly, thus improving the efficiency of wire winding; at the same time, when the protection box moves toward the terminal block, the elastic clamp will close and clamp the wire;

[0023] 5. When the protection box moves toward the terminal block, the airbag expands and becomes larger and adaptively squeezes on the wire to squeeze and position the wire;

[0024] 6. The adjusting rod can be rotated to allow the airbag to continue to expand to fill the part where the wire is missing, increasing the flexibility of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a separated mining flameproof and intrinsically safe dual power supply switching control box from one perspective of the present invention.

[0026] Figure 2 This is a structural schematic diagram from another perspective of the separate mining flameproof and intrinsically safe dual power supply switching control box of the present invention.

[0027] Figure 3 It is a schematic diagram of the protection box and wire threading trough structure of the present invention.

[0028] Figure 4 It is a schematic diagram of the terminal block and terminal post structure of the present invention.

[0029] Figure 5 It is a schematic diagram of the terminal block and the shrinkage groove structure of the present invention.

[0030] Figure 6 For the present invention Figure 5 A schematic diagram of the enlarged structure in the middle.

[0031] Figure 7It is a schematic diagram of the terminal block and protection box structure of the present invention.

[0032] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point B in the middle.

[0033] Fig. 9 It is a schematic diagram of the structure of the protection box of the present invention.

[0034] Fig.10 For the present invention Fig. 9 Enlarged schematic diagram of the structure at point C in the middle.

[0035] Fig.11 It is a schematic diagram of the structure of the adjusting rod of the present invention.

[0036] Fig.12 For the present invention Fig.11 Enlarged schematic diagram of the structure at point D in the middle.

[0037] Fig.13 For the present invention Fig.11 Enlarged schematic diagram of the structure at point E in the middle.

[0038] In the figure: 1. Box body; 2. Terminal block; 3. Protection box; 4. Threaded hole; 5. Contraction groove; 6. Terminal post; 7. Wire slot; 8. Slide hole; 9. Slide post; 10. Rotating block; 11. First spring; 12. Pressure block; 13. Second spring; 14. Electric contact piece; 15. Threading groove; 16. Adjusting rod; 17. Elastic clamp; 18. Limiting block; 19. Storage groove; 20. Airbag; 21. Fixed block; 22. Slide groove; 23. First slide plate; 24. Third spring; 25. First air hole; 26. Inner cavity; 27. Second slide plate; 28. Threaded groove; 29. ​​Second air hole. DETAILED DESCRIPTION

[0039] The present invention provides Figures 1 to 13 The shown separated mining flameproof and intrinsically safe dual power switching control box comprises a box body 1. The box body 1 adopts a composite structure composed of a flameproof housing and an intrinsically safe housing, and has a dual power switching function to ensure stability of use and is suitable for mining.

[0040] A terminal block 2 is installed inside the box 1, and a protection box 3 is matched on the terminal block 2. The protection box 3 and the terminal block 2 are detachable structures and are fixed by screws or the like during installation.

[0041] The box body 1 includes a control chamber and a wiring chamber, forming an upper and lower separated structure and cooperating with each other. Instruments and the like are arranged in the control chamber, and the terminal block 2 is arranged in the wiring chamber.

[0042] Taking into account that in the prior art, a row of parallel screws is usually used to fix the wires and the terminal block 2, which affects the wiring efficiency and may also cause the screws to loosen due to insufficient tightening due to improper operation by the operator, in order to improve the use efficiency of the separate mining explosion-proof and intrinsically safe dual power switching control box, a plurality of terminal posts 6 are provided at the upper and lower ends of the terminal block 2, and the number of terminal posts 6 at both ends can be adjusted according to the purpose and usage requirements, wherein the terminal posts 6 at one end are used for incoming lines and the other end are used for outgoing lines.

[0043] The terminal block 2 is provided with a threaded hole 4 that is threadedly matched with the terminal post 6. Specifically, the terminal post 6 is provided with an external thread structure, and the threaded hole 4 is provided with an internal thread structure (not shown in the figure), and the external thread structure cooperates with the internal thread structure, and in actual production, the surfaces of the external thread structure and the internal thread structure are relatively smooth.

[0044] A contraction groove 5 is provided inside the threaded hole 4, and the terminal 6 extends into the contraction groove 5. A second spring 13 is provided inside the contraction groove 5, and one end of the second spring 13 abuts against the inner wall of the contraction groove 5. One end of the second spring 13 abuts against the terminal 6, which does not affect the rotation of the terminal 6.

[0045] When the terminal 6 is squeezed toward the contraction groove 5, since the terminal 6 and the threaded hole 4 are threadedly matched, the terminal 6 will move toward the contraction groove 5 and rotate, and the second spring 13 will contract; and the elastic supporting force of the second spring 13 can prevent the terminal 6 from moving at will when not under pressure.

[0046] The terminal 6 is provided with a wire clamping groove 7 for the wire to pass through, and a pressure block 12 for squeezing the wire is slidably arranged inside the wire clamping groove 7. A sliding hole 8 is provided at one end of the terminal 6 close to the pressure block 12, and a sliding column 9 is slidably arranged inside the sliding hole 8. The pressure block 12 is fixedly connected to the sliding column 9, and a rotating block 10 is rotatably connected to the end of the sliding column 9 away from the pressure block 12. The rotating block 10 is abutted and matched with the protection box 3. A first spring 11 is sleeved on the outside of the sliding column 9, and one end of the first spring 11 abuts on the rotating block 10, and the other end of the first spring 11 abuts on the terminal 6, and the elastic supporting force of the first spring 11 is less than the elastic supporting force of the second spring 13. In the initial state, the reset elastic force of the first spring 11 makes the pressure block 12 close to the sliding hole 8, which is convenient for the wire to pass through the wire clamping groove 7.

[0047] In actual use (refer to Figure 6): The first step is to close the protection box 3 on the terminal block 2 after the wire passes through the wire clamping slot 7. When the protection box 3 moves from top to bottom, the protection box 3 first contacts the rotating block 10. Since the elastic supporting force of the first spring 11 is less than the elastic supporting force of the second spring 13, the protection box 3 will first squeeze the rotating block 10, the sliding column 9, and the pressing block 12 to move vertically downward. During this process, the terminal 6 remains stationary, and then the pressing block 12 is squeezed on the wire to complete the squeezing and fixing of the wire.

[0048] In the second step, when the pressing block 12 is pressed on the wire, the squeezing force will act on the terminal 6 from top to bottom. Since the terminal 6 and the threaded hole 4 are threadedly matched (the terminal 6 is provided with an external thread structure, and the threaded hole 4 is provided with an internal thread structure, and the surfaces of the external thread structure and the internal thread structure are relatively smooth), the terminal 6 will undergo spiral motion under the action of the squeezing force, that is, the terminal 6 moves toward the direction of the contraction groove 5 and rotates.

[0049] In this process, since the rotating block 10 and the sliding column 9 are rotationally connected, the protection box 3 is attached to the rotating block 10 and squeezed, which will not affect the movement of the terminal 6 and other structures.

[0050] In the third step, the slide post 9, the pressure block 12 and the terminal 6 move synchronously, and the wire is automatically bent and wound around the terminal 6 to avoid subsequent loosening and falling off. It can also expand the contact area between the wire and the terminal 6, making the electrical connection more secure and more stable to use, especially when the box 1 is used in special environments such as mines.

[0051] By providing structures such as the terminal block 2, the protection box 3 and the terminal 6, multiple wires can be squeezed and positioned at the same time, and the wires are automatically bent and wound around the terminal 6. The contact area between the wires and the terminal 6 can also be expanded, making the electrical connection more secure and improving the use efficiency of the separate mining flameproof and intrinsically safe dual power supply switching control box.

[0052] During the closing and squeezing process of the protection box 3, since the rotating block 10 is rotationally connected to the slide post 9, the rotating block 10 is directly attached to the protection box 3, which does not affect the rotation of structures such as the slide post 9 and the pressure block 12, thereby ensuring the smooth rotation of the terminal 6.

[0053] In addition, since it can automatically bend and wrap around the terminal 6, it is suitable for wires with appropriate hardness and has bending properties; at the same time, the contact part of the wire and the terminal 6 is peeled, and the terminal 6 and other structures are made of conductive materials, such as copper, and the protection box 3 and other structures are made of insulating materials, such as polypropylene, which can be adjusted according to specific usage.

[0054] Considering that in actual use, some of the terminals 6 may not need to be connected to the wires, an electric contact 14 is fixedly embedded on the side wall of the shrink groove 5, and the terminal 6 cooperates with the electric contact 14. A conductive sheet (not shown in the figure) is arranged inside the terminal block 2 to connect the corresponding electric contact 14 at the incoming line position and the electric contact 14 at the outgoing line position to ensure power supply. Figure 6 When the wire is not installed, the electric contact piece 14 is staggered with the terminal 6.

[0055] If a wire is connected to the terminal post 6, when the protection box 3 is closed on the terminal block 2, the terminal post 6 moves toward the shrink groove 5 and contacts the electric contact piece 14 to ensure subsequent electrical connection.

[0056] At the same time, when the end of the wire passes through the wire clamping groove 7 on the corresponding terminal 6, since the electric contact piece 14 is staggered with the terminal 6, the wire is always in the power-off state when passing through the wire clamping groove 7, avoiding the safety hazard caused by the operator's improper operation resulting in power failure.

[0057] If some of the terminals 6 do not need to be connected to the wires (idle terminals 6), there is a lack of blocking and limiting of the wires, and the pressing block 12 will continue to move toward the shrinkage groove 5 inside the wire clamping groove 7, and the terminal 6 will not move, that is, the terminal 6 will not contact the electric contact piece 14, and the idle terminal 6 will not generate heat when it is powered on and used subsequently, thereby improving the safety of the separate mining explosion-proof and intrinsically safe dual power supply switching control box.

[0058] In order to improve the stability of the connection between the wire and the terminal block 2, an elastic clip 17 is provided on one side of the terminal block 6 close to the edge of the terminal block 2. The elastic clip 17 has a certain elasticity. A limit block 18 for correspondingly cooperating with the elastic clip 17 is fixedly connected to the inner wall of the protection box 3. The limit block 18 is provided with a trapezoidal groove (refer to Fig.10 ), and the width of the side close to the protection box 3 is small.

[0059] When in use, the operator removes the protection box 3, clips the wire into the elastic clip 17, and performs preliminary fixation; and the end of the wire passes through the wire clamping groove 7 on the corresponding terminal 6, and the arrangement of all wires is completed in this way.

[0060] The protection box 3 is closed on the terminal block 2. During the rotation of the terminal post 6, the elastic clip 17 prevents the wire from swinging randomly, thereby improving the efficiency of wire winding. At the same time, during the movement of the protection box 3 toward the terminal block 2, the limit block 18 moves synchronously. When the two sides of the elastic clip 17 respectively abut against the inclined walls on both sides of the limit block 18, the elastic clip 17 will be retracted to clamp and fix the wire.

[0061] The position where the wire is clamped into the elastic clamp 17 does not need to be peeled to avoid abrasion of the wire core.

[0062] The upper and lower ends of the protection box 3 are provided with threading grooves 15 for the wires to pass through, and the threading groove 15 is provided with a receiving groove 19 on one side facing the terminal block 2, and an air bag 20 is fixedly connected inside the receiving groove 19. When the air bag 20 expands, it will adaptively squeeze on the wire to squeeze and position the wire.

[0063] A pressing assembly that cooperates with the airbag 20 is provided on one side of the storage groove 19, and the pressing assembly includes a fixed block 21, a slide groove 22, a first slide plate 23, a third spring 24 and a first air hole 25. The slide groove 22 is provided on the side of the protection box 3 facing the terminal block 2, and the first air hole 25 is provided on the inner wall of the slide groove 22. The slide groove 22 is connected with the airbag 20 through the first air hole 25. The third spring 24 is located inside the slide groove 22, one end of the third spring 24 is fixedly connected to the first slide plate 23, one end of the third spring 24 is fixedly connected to the inner wall of the slide groove 22, the fixed block 21 is fixedly connected to the terminal block 2, and the fixed block 21 abuts and cooperates with the first slide plate 23.

[0064] When the protection box 3 is closed on the terminal block 2, the fixed block 21 corresponds to the corresponding slide groove 22. When the protection box 3 moves toward the terminal block 2, the fixed block 21 extends into the corresponding slide groove 22. Under the squeezing action of the fixed block 21, the first slide plate 23 moves away from the terminal block 2. The gas inside the slide groove 22 enters the interior of the airbag 20 through the first air hole 25, so that the airbag 20 expands and adaptively squeezes on the wire to extrude and position the wire.

[0065] Considering that when some of the terminals 6 do not need to be connected to the wires, the wires passing through the threading groove 15 become less, and the airbag 20 needs to continue to expand and fill the part where the wires are missing. Since the fixed block 21 has completely extended into the corresponding slide groove 22 at this time, in order to adjust the airbag 20, an adjustment component that cooperates with the airbag 20 is provided on the other side of the storage groove 19. The adjustment component includes an adjustment rod 16, an inner cavity 26, a second slide plate 27, a thread groove 28 and a second air hole 29. The inner cavity 26 is provided inside the wall of the protection box 3, the second air hole 29 is provided on the inner wall of the inner cavity 26, the inner cavity 26 is connected with the airbag 20 through the second air hole 29, the second slide plate 27 is slidably provided inside the inner cavity 26, the thread groove 28 is provided on the outer wall of the protection box 3, the thread groove 28 is connected with the inner cavity 26, the adjustment rod 16 is threadedly connected inside the thread groove 28, and the second slide plate 27 is rotatably connected to the adjustment rod 16.

[0066] The adjusting rod 16 can be rotated to drive the second slide plate 27 to move toward the terminal block 2, and the gas inside the inner cavity 26 enters the interior of the airbag 20 through the second air hole 29, so that the airbag 20 can continue to expand to fill the part where the wire is missing, thereby increasing the flexibility of use.

[0067] The friction coefficient between the adjusting rod 16 and the inner wall of the threaded groove 28 is appropriate, and the airbag 20 will not rotate in the opposite direction after it expands. In actual use, a limiting structure such as a latch can be provided to position the adjusting rod 16, which can be adjusted according to specific usage conditions.

[0068] Working principle: The operator removes the protection box 3, clips the wire into the elastic clip 17, and the end of the wire passes through the wire slot 7 on the corresponding terminal 6. In this way, the arrangement of all wires is completed.

[0069] Then, the protection box 3 is closed on the terminal block 2. In the process of the protection box 3 moving toward the terminal block 2, the protection box 3 first contacts the rotating block 10, and squeezes the rotating block 10, the sliding column 9, and the pressing block 12 to move toward the terminal block 2. The pressing block 12 is squeezed on the wire to complete the squeezing and fixing of the wire; then the squeezing force acts on the terminal post 6. Since the terminal post 6 and the threaded hole 4 are threadedly matched, the terminal post 6 moves toward the contraction groove 5 and rotates, the sliding column 9 and the pressing block 12 move synchronously, and the wire automatically bends and wraps around the terminal post 6 to avoid subsequent loosening and falling off, thereby improving the use efficiency of the mining explosion-proof control box; in addition, the terminal post 6 moves toward the contraction groove 5 and contacts with the electric contact piece 14 to ensure subsequent power connection.

[0070] If some of the terminals 6 do not need to be connected to the wires, there is a lack of blocking and limiting means for the wires, and the pressing block 12 will continue to move inside the wire clamping groove 7 toward the shrinkage groove 5, and the terminal 6 will not move, that is, the terminal 6 will not contact the electric contact piece 14, and the idle terminal 6 will not generate heat when it is subsequently powered on, thereby improving the safety of the separate type mining explosion-proof and intrinsically safe dual power supply switching control box.

[0071] During the rotation of the terminal 6, the elastic clip 17 prevents the wire from swinging randomly, thereby improving the efficiency of wire winding; at the same time, during the movement of the protection box 3 toward the terminal block 2, the limit block 18 moves synchronously, and when the two sides of the elastic clip 17 respectively abut against the inclined walls on both sides of the limit block 18, the elastic clip 17 will retract to clamp and fix the wire.

[0072] At the same time, the fixed block 21 extends into the corresponding slide groove 22. Under the squeezing effect of the fixed block 21, the first slide plate 23 moves away from the terminal block 2. The gas inside the slide groove 22 enters the interior of the airbag 20 through the first air hole 25, causing the airbag 20 to expand and adaptively squeeze on the wire to squeeze and position the wire.

[0073] When some of the terminals 6 do not need to be connected to wires, the number of wires passing through the wire threading groove 15 becomes less, and the airbag 20 needs to continue to expand and fill the part where the wires are missing. Since the fixing block 21 has been fully extended into the corresponding slide groove 22, the adjusting rod 16 can be rotated at this time to drive the second slide plate 27 to move toward the terminal block 2. The gas inside the inner cavity 26 enters the interior of the airbag 20 through the second air hole 29, so that the airbag 20 can continue to expand to fill the part where the wires are missing, thereby increasing the flexibility of use.

[0074] When the protection box 3 cannot be moved any further, the protection box 3 is fixed to the terminal block 2 using screws.

Claims

1. A separate type explosion-proof and intrinsically safe dual power supply switching control box for mining, comprising a box body (1), characterized in that: A terminal block (2) is installed inside the box (1), and a protection box (3) is provided on the terminal block (2); The upper and lower ends of the terminal block (2) are both provided with terminal posts (6), the terminal posts (6) have a wire clamping groove (7) for the wire to pass through, and a pressing block (12) for squeezing the wire is slidably provided inside the wire clamping groove (7); The wire passes through the wire clamping groove (7), and when the protection box (3) is closed on the terminal block (2), the protection box (3) drives the pressing block (12) to squeeze and position the wire, and the terminal post (6) is squeezed to rotate, so that the wire is wound around the terminal post (6); The upper and lower ends of the protection box (3) are both provided with threading grooves (15) for the wires to pass through; A receiving groove (19) is provided on one side of the threading groove (15) facing the terminal block (2); an air bag (20) is fixedly connected to the interior of the receiving groove (19); an extrusion component cooperating with the air bag (20) is provided on one side of the receiving groove (19); and an adjustment component cooperating with the air bag (20) is provided on the other side of the receiving groove (19); The extrusion assembly comprises a fixed block (21), a slide groove (22), a first slide plate (23), a third spring (24) and a first air hole (25); the slide groove (22) is provided on a side of the protection box (3) facing the terminal block (2); the first air hole (25) is provided on an inner wall of the slide groove (22); the slide groove (22) is connected to the air bag (20) through the first air hole (25); the third spring (24) is located inside the slide groove (22); one end of the third spring (24) is fixedly connected to the first slide plate (23); one end of the third spring (24) is fixedly connected to the inner wall of the slide groove (22); the fixed block (21) is fixedly connected to the terminal block (2); the fixed block (21) is in abutment with the first slide plate (23); The adjustment assembly comprises an adjustment rod (16), an inner cavity (26), a second slide plate (27), a thread groove (28) and a second air hole (29); the inner cavity (26) is formed inside a wall of the protection box (3); the second air hole (29) is formed on an inner wall of the inner cavity (26); the inner cavity (26) is communicated with the air bag (20) via the second air hole (29); the second slide plate (27) is slidably arranged inside the inner cavity (26); the thread groove (28) is formed on an outer wall of the protection box (3); the thread groove (28) is communicated with the inner cavity (26); the adjustment rod (16) is threadedly connected to the inner wall of the thread groove (28); and the second slide plate (27) is rotatably connected to the adjustment rod (16).

2. According to claim 1, a separate type explosion-proof and intrinsically safe dual power supply switching control box for mining, characterized in that: The terminal block (2) is provided with a threaded hole (4) threadably matched with the terminal post (6), a contraction groove (5) is provided inside the threaded hole (4), the terminal post (6) extends into the contraction groove (5), and a second spring (13) is provided inside the contraction groove (5).

3. According to claim 2, a separate type explosion-proof and intrinsically safe dual power supply switching control box for mining, characterized in that: An electric contact sheet (14) is fixedly embedded on the side wall of the shrinkage groove (5), and the terminal post (6) cooperates with the electric contact sheet (14).

4. According to claim 1, a separate type explosion-proof and intrinsically safe dual power supply switching control box for mining, characterized in that: A sliding hole (8) is provided at one end of the terminal (6) close to the pressure block (12), a sliding column (9) is slidably arranged inside the sliding hole (8), the pressure block (12) is fixedly connected to the sliding column (9), and a rotating block (10) is rotatably connected to one end of the sliding column (9) away from the pressure block (12), the rotating block (10) is in abutment with the protection box (3), and a first spring (11) is sleeved on the outside of the sliding column (9).

5. According to claim 1, a separate type explosion-proof and intrinsically safe dual power supply switching control box for mining, characterized in that: An elastic clip (17) is provided on one side of the terminal post (6) close to the edge of the terminal block (2), and a limit block (18) for correspondingly cooperating with the elastic clip (17) is fixedly connected to the inner wall of the protection box (3).

6. A separate type explosion-proof and intrinsically safe dual power switching control box for mining according to claim 1, characterized in that: The terminal posts (6) are provided in plurality.

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