A mining explosion-proof equipment housing interlocking mechanism

Abstract

A mining explosion-proof equipment housing interlocking mechanism includes an explosion-proof housing, a control shaft, a control handle, a stop plate, a guide slide rod, a locking rod, and an interlocking block. The control shaft is rotatably connected to the explosion-proof housing via a bearing sleeve, with one end connected to an external control handle and the other end connected to an internal switch control block and a stop plate. The outer edge of the stop plate has a first arc-shaped surface and a second arc-shaped surface with different radii. The guide slide rod abuts against the contour of the stop plate via an abutment rod and is reset by a return spring; the locking rod on its side cooperates with the interlocking block on the door cover. Rotating the control handle to the on-state causes the stop plate to push the guide slide rod, causing the locking rod to block the interlocking block, achieving mechanical locking while simultaneously powering on the equipment; rotating it to the off-state causes the return spring to retract the locking rod, allowing the door cover to open while simultaneously de-powering the equipment. This utility model achieves absolute synchronization between electrical on / off and mechanical interlocking through a purely mechanical structure, fundamentally eliminating the risk of opening the cover while it is energized, and has the advantages of inherent safety, reliable interlocking, and simple operation.

Description

Technical Field

[0001] This utility model relates to the field of safety technology for explosion-proof mining equipment, and specifically to an interlocking mechanism for the housing of explosion-proof mining equipment. Background Technology

[0002] Mining explosion-proof equipment is a critical safety feature in coal mines, petrochemical plants, and natural gas plants where explosive gas environments exist. Its casing is typically designed with a quick-opening door for easy installation, commissioning, and maintenance. However, this quick-opening door design also presents significant safety risks: if the equipment is accidentally opened while energized, internal electrical sparks or high-temperature components coming into contact with external explosive gases can easily trigger a serious explosion, posing a fatal threat to personnel and mine safety. Therefore, national standards and industry regulations mandate that such equipment be equipped with a "power supply-door interlock" mechanism. Its core function is to ensure that the quick-opening door can only be opened when the equipment is completely de-energized; conversely, the equipment cannot be powered on or started when the quick-opening door is open or not fully closed.

[0003] Currently, most interlocking mechanisms on the market employ a direct mechanical linkage structure between the locking rod and the handle. The rotation of the door handle directly drives one or more locking rods, engaging or disengaging them with the lock holes on the door frame. Simultaneously, the movement of this locking rod is linked to a microswitch via a linkage mechanism to control the main circuit power supply. However, this type of structure suffers from numerous transmission links, high frictional losses, and the need to overcome the contact pressure of the microswitch, resulting in laborious opening / closing operations, especially under frequent opening and closing conditions, which is extremely inconvenient for operators. Furthermore, after prolonged use, multiple hinge points and sliding surfaces are prone to mechanical wear, leading to interlock failure and posing safety hazards. Additionally, the numerous transmission components such as linkages and shafts result in poor compactness, hindering equipment miniaturization. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a mining explosion-proof equipment housing interlocking mechanism that overcomes the deficiencies of existing technologies. It is reasonably designed and achieves absolute synchronization between electrical switching and mechanical interlocking through a purely mechanical structure, thereby effectively eliminating the risk of opening the cover while it is energized. It has the advantages of inherent safety, reliable interlocking, and simple operation.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A mining explosion-proof equipment housing interlocking mechanism includes an explosion-proof housing. The front side of the explosion-proof housing is connected to a door cover via a quick-opening door structure. A control shaft is rotatably connected to the front side of the explosion-proof housing via a bearing sleeve. A control handle is fixedly installed at one end of the control shaft, which is located outside the explosion-proof housing. The other end of the control shaft extends into the explosion-proof housing and is fixedly installed with a switch control block. The switch control block is connected to the control terminal of an isolating reversing switch body inside the explosion-proof housing. A stop plate is fixedly sleeved on the outer surface of the control shaft, which is located inside the explosion-proof housing.

[0007] The outer circumference of the gear shift disc is provided with a first gear shift groove and a second gear shift groove, which are spaced apart along the circumferential direction. The outer circumference of the gear shift disc is provided with a first arc-shaped surface and a second arc-shaped surface, which are located on the radial sides of the gear shift disc and the second arc-shaped surface and the second gear shift groove are located on the other radial sides of the gear shift disc. The first arc-shaped surface and the second arc-shaped surface are connected by a smooth transition.

[0008] A guide slide rod is provided on the front side of the explosion-proof housing cavity. The guide slide rod is slidably connected in the guide seat, which is fixedly installed on the front side of the explosion-proof housing cavity. An abutment rod is vertically fixedly installed on the upper end of the guide slide rod. The abutment rod abuts against the outer edge of the stop plate. A locking rod is fixedly connected to the side of the guide slide rod. An interlocking block is fixedly installed on the inner side of the door cover. The locking rod and the interlocking block are movably engaged. When the abutment rod abuts against the first arc-shaped surface, the locking rod disengages from the interlocking block, and the door cover can be opened freely. When the abutment rod abuts against the second arc-shaped surface, the locking rod engages with the side of the interlocking block, and the door cover is locked and cannot be opened. A return spring is sleeved on the outer surface of the guide slide rod. One end of the return spring is connected to the guide seat, and the other end of the return spring abuts against the stepped surface of the guide slide rod.

[0009] Preferably, the guide slide rod includes two vertical guide rods and one horizontal connecting rod. The upper ends of the two vertical guide rods are vertically fixed to the lower surface of the horizontal connecting rod. The locking rod is vertically fixed to the lower surface of the end of the horizontal connecting rod. The abutting rod is vertically fixed to the upper surface of the horizontal connecting rod. One end of the return spring is connected to the guide seat, and the other end of the return spring abuts against the horizontal connecting rod.

[0010] Preferably, a limiting sleeve is fitted on the outer surface of the abutment rod, and the limiting sleeve is fixedly installed on the front side of the inner cavity of the explosion-proof housing.

[0011] Preferably, an emergency stop button is movably provided on the front side of the explosion-proof housing. The emergency stop button passes through the front side of the explosion-proof housing and is slidably connected to the explosion-proof housing through a guide sleeve. A limit block is fixedly installed on the inner end of the emergency stop button. The limit block is movably engaged with the first stop groove and the second stop groove.

[0012] Preferably, a support base is fixedly installed on the front side wall of the inner cavity of the explosion-proof housing, and a micro switch is fixedly installed on the support base, with the sensing end of the micro switch in movable contact with the limit block.

[0013] This utility model provides a mining explosion-proof equipment housing interlocking mechanism with the following advantages: By using a single control shaft to rigidly and synchronously drive the stop plate and the switch control block, the synchronous occurrence and release of "mechanical locking" and "electrical connection" can be physically forced. This ensures the "power off first, door open later" operation sequence, guaranteeing the safety of maintenance personnel. The entire operation process is smooth and intuitive, requiring no unnecessary steps, greatly improving work efficiency and reducing operational complexity. Through the precise contour design of the first and second arc surfaces on the stop plate, different rotation angles correspond to different linear displacements of the abutment rod, thereby precisely controlling the extension and retraction of the locking rod, ensuring the uniqueness and stability of the "on" and "off" positions. Furthermore, the smooth transition between the first and second arc surfaces ensures the smoothness and shock-free movement of the abutment rod. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the accompanying drawings used in the description of this utility model or the prior art will be briefly introduced below.

[0015] Figure 1 A schematic diagram of the structure of this utility model;

[0016] Figure 2 A schematic diagram of the structure of the front wall of the inner cavity of the explosion-proof shell in this utility model;

[0017] Figure 3 A schematic diagram of the cross-sectional structure of this utility model;

[0018] Figure 4 A schematic diagram of the structure of the stop plate and guide slide rod in this utility model;

[0019] Figure 5 A schematic diagram of the gear shift disc in this utility model;

[0020] Explanation of the labels in the diagram:

[0021] 1. Explosion-proof housing; 2. Quick-opening door structure; 3. Door cover; 4. Control shaft; 5. Control handle; 6. Stop plate; 7. Switch control block; 8. First stop slot; 9. Second stop slot; 10. First arc-shaped surface; 11. Second arc-shaped surface; 12. Guide slide rod; 13. Guide seat; 14. Abutment rod; 15. Locking rod; 16. Interlocking block; 17. Return spring; 18. Limit sleeve; 19. Emergency stop button; 20. Limit block; 21. Support seat; 22. Micro switch. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0023] Example 1, as Figure 1-5 As shown, a mining explosion-proof equipment housing interlocking mechanism includes an explosion-proof housing 1. The front side of the explosion-proof housing 1 is connected to a door cover 3 through a quick-opening door structure 2. A control shaft 4 is rotatably connected to the front side of the explosion-proof housing 1 through a bearing sleeve. A control handle 5 is fixedly installed at one end of the control shaft 4. The control handle 5 is located outside the explosion-proof housing 1. The other end of the control shaft 4 extends into the interior of the explosion-proof housing 1 and is fixedly installed with a switch control block 7. The switch control block 7 is connected to the control end of the isolation reversing switch body inside the explosion-proof housing 1. A stop plate 6 is fixedly sleeved on the outer surface of the control shaft 4. The stop plate 6 is located inside the explosion-proof housing 1.

[0024] The outer periphery of the gear shift disc 6 is provided with a first gear shift groove 8 and a second gear shift groove 9, which are spaced apart along the circumferential direction. The outer periphery of the gear shift disc 6 is provided with a first arc-shaped surface 10 and a second arc-shaped surface 11, which are located on the radial sides of the gear shift disc 6, respectively. The second arc-shaped surface 11 and the second gear shift groove 8 are located on the other radial sides of the gear shift disc 6, respectively. The first arc-shaped surface 10 and the second arc-shaped surface 11 are connected by a smooth transition.

[0025] A guide slide rod 12 is provided on the front side of the inner cavity of the explosion-proof housing 1. The guide slide rod 12 is slidably connected in the guide seat 13. The guide seat 13 is fixedly installed on the front side of the inner cavity of the explosion-proof housing 1. An abutment rod 14 is vertically fixedly installed on the upper end of the guide slide rod 12. The abutment rod 14 abuts against the outer edge of the stop plate 6. A locking rod 15 is fixedly connected to the side of the guide slide rod 12. An interlocking block 16 is fixedly installed on the inner side of the door cover 3. The locking rod 15 and the interlocking block 16 are movably engaged. When the abutting rod 14 abuts against the first arc-shaped surface 10, the locking rod 15 disengages from the interlocking block 16, and the door cover 3 can be opened freely; when the abutting rod 14 abuts against the second arc-shaped surface 11, the locking rod 15 engages with the side of the interlocking block 16, and the door cover 3 is locked and cannot be opened; a return spring 17 is sleeved on the outer surface of the guide slide rod 12, one end of the return spring 17 is connected to the guide seat 13, and the other end of the return spring 17 abuts against the stepped surface of the guide slide rod 12.

[0026] Working principle:

[0027] The core of this utility model lies in the fact that rotating the control handle 5 drives the control shaft 4 to rotate, thereby synchronously driving the switch control block 7 and the stop plate 6 to rotate. This achieves the switching of the isolation reversing switch body, and simultaneously realizes the interlocking control of the door cover 3 through the cooperation of the first arc-shaped surface 10 and the second arc-shaped surface 11 on the stop plate 6 with the abutment rod 14. Specifically:

[0028] In the power-off unlocked state (door cover 3 can be opened), the first arc-shaped surface 10 on the stop plate 6 rotates to the position where it contacts the abutment rod 14. The design radius of the first arc-shaped surface is small, so it cannot push the abutment rod outward. Therefore, at this time, the locking rod 15 fixed to the guide slide rod 12 is completely disengaged from the interlocking block 16 installed on the inside of the door cover 3. Since the locking rod 15 does not form an obstruction, the door cover 3 can be freely opened through the quick-opening door structure 2 (in this embodiment, when the door cover 3 is opened, it first slides to the left through the quick-opening door structure 2, so that the claw of the door cover 3 disengages from the locking block of the explosion-proof housing 1, and then flips outward to open, which facilitates the inspection and maintenance of internal components. This is prior art and will not be described in detail). At the same time, the switch control block 7 rotates synchronously with the stop plate 6 to the power-off position of the isolation reversing switch body, ensuring that the main circuit is completely disconnected and forming a safety isolation.

[0029] When it is necessary to close the door cover and connect the power, first close the door cover 3 and lock it through the quick-opening door structure 2. At this time, the operator rotates the control handle 5 from the "power off" position to the "power on" position (for example, rotate 80° or 90° clockwise). As the control handle 5 rotates, the control shaft 4 synchronously drives the stop plate 6 and the switch control block 7 to rotate. The second arc surface 11 on the stop plate 6 gradually turns and contacts the abutment rod 14. Due to the large design radius of the second arc surface 11, it will gradually push the abutment rod 14 downward during the rotation, so as to force the entire guide slide rod 12 to overcome the elastic force of the return spring 17 and slide downward, thereby driving the locking rod 15 to move downward, so that it re-contacts and engages with the side of the interlocking block 16 to limit and lock the interlocking block 16, thereby ensuring that the door cover 3 cannot be opened accidentally and realizing mechanical interlocking. At the same time, the switch control block 7 rotates synchronously to switch the isolating reversing switch body to the power-on position, the main circuit is turned on, and the equipment enters the operation preparation state. The entire process achieves a closed-loop safety logic of "closing the door first, then turning on the power," ensuring that the power cannot be connected when the door is not fully locked, effectively preventing safety accidents caused by misoperation.

[0030] This invention employs a single control shaft 4 to rigidly and synchronously drive the stop plate 6 and the switch control block 7, thereby physically forcing the simultaneous occurrence and release of "mechanical locking" and "electrical connection." Specifically, only when the control handle 5 is rotated to the energized position can the stop plate 6 push the abutment rod 14 downwards via the second arc-shaped surface 11, causing the locking rod 15 to engage with the interlocking block 16, achieving mechanical locking of the door cover. Simultaneously, the switch control block connects the circuit. Conversely, in the de-energized state, the first arc-shaped surface of the stop plate cannot push the abutment rod, the locking rod disengages from the interlocking block, and the door cover can be opened freely, ensuring the "power off first, door open later" operation sequence and protecting the safety of maintenance personnel. Operators only need to rotate one control handle to complete both key actions—"power off + mechanical unlocking" or "mechanical locking + energizing"—in one operation. The operation is smooth and intuitive, requiring no extra steps, greatly improving work efficiency and reducing operational complexity. Through the precise contour design of the first and second arc-shaped surfaces on the stop plate 6, different rotation angles correspond to different linear displacements of the abutment rod, thereby precisely controlling the extension and retraction of the locking rod and ensuring the uniqueness and stability of the "on" and "off" positions. Furthermore, a smooth transition is achieved between the first and second arc-shaped surfaces, ensuring the smoothness and shock-free movement of the abutment rod 14. When the abutment rod 14 is at the second arc-shaped surface 11, its force state is approximately the "dead point" position of the cam mechanism, exhibiting excellent self-locking characteristics and effectively preventing locking failure due to equipment vibration or accidental force on the door cover.

[0031] In Embodiment Two, as a further preferred embodiment of Embodiment One, the guide slide 12 includes two vertical guide rods and one horizontal connecting rod. The upper ends of the two vertical guide rods are vertically fixed to the lower surface of the horizontal connecting rod. The locking rod 15 is vertically fixed to the lower surface of the end of the horizontal connecting rod. The abutment rod 14 is vertically fixed to the upper surface of the horizontal connecting rod. One end of the return spring 17 is connected to the guide seat 13, and the other end of the return spring 17 abuts against the horizontal connecting rod. The two vertical guide rods and the horizontal connecting rod form a stable frame structure, thereby enabling the entire guide slide assembly to maintain extremely high rigidity and morphological stability when subjected to the force applied by the stop plate 6 through the abutment rod 14. When the abutment rod 14 is pushed by the arc-shaped surface of the stop plate 6, the force is evenly distributed to the two vertical guide rods through the horizontal connecting rod, and then the two vertical guide rods slide within the guide seat 13. This two-point guiding method completely avoids the torsion, warping, or jamming that may occur between a single guide rod and the guide seat when under force, ensuring absolutely smooth and reliable operation.

[0032] In embodiment three, as a further preferred embodiment two, a limiting sleeve 18 is fitted onto the outer surface of the abutment rod 14, and the limiting sleeve 18 is fixedly installed on the front side of the inner cavity of the explosion-proof housing 1. The limiting sleeve 18 provides an additional lateral support point for the abutment rod 14 located above its movement path. This effectively suppresses lateral swaying of the abutment rod 14 in any direction, ensuring that the end of the abutment rod 14 maintains precise and stable line or point contact with the contour of the stop plate 6. This, in turn, ensures the accuracy of the displacement of the locking rod 15, thereby improving the reliability of the interlocking.

[0033] In Example 4, as a further preferred embodiment of Example 2, an emergency stop button 19 is movably inserted through the front side of the explosion-proof housing 1. The emergency stop button 19 passes through the front side of the explosion-proof housing 1 and is slidably connected to the explosion-proof housing 1 via a guide sleeve. A limit block 20 is fixedly installed at the inner end of the emergency stop button 19, and the limit block 20 is movably engaged with the first stop groove 8 and the second stop groove 9. A support base 21 is fixedly installed on the front side wall of the inner cavity of the explosion-proof housing 1. A micro switch 22 is fixedly installed on the support base 21, and a contact plate is fixedly installed on the limit block 20. The sensing end of the micro switch 22 is in movable contact with the contact plate.

[0034] Therefore, in the event of an emergency during equipment operation or maintenance, the operator can instantly press the emergency stop button 19. This causes the inner limit block 20 to move and engage with the corresponding first or second stop slot on the stop plate 6. This instantly locks the rotation of the stop plate 6. Since the stop plate is rigidly connected to the control shaft 4 and control handle 5, the operating handle is completely locked, preventing any "on" or "off" switching operations. Simultaneously, the micro switch 22 is triggered by the limit block 20. When the emergency stop is reset, the limit block 20 retracts, and the micro switch resets. This on / off signal can be transmitted to the central control room or ground monitoring system, thus achieving rapid power cut-off and safety interlocking of the main circuit or critical equipment.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A mining explosion-proof equipment housing interlocking mechanism, comprising an explosion-proof housing (1), wherein the front side of the explosion-proof housing (1) is connected to a door cover (3) via a quick-opening door structure (2), characterized in that: The front side of the explosion-proof housing (1) is rotatably connected to a control shaft (4) via a bearing sleeve. A control handle (5) is fixedly installed at one end of the control shaft (4). The control handle (5) is located outside the explosion-proof housing (1). The other end of the control shaft (4) extends into the explosion-proof housing (1) and is fixedly installed with a switch control block (7). The switch control block (7) is connected to the control end of the isolation reversing switch body inside the explosion-proof housing (1). A stop plate (6) is fixedly sleeved on the outer surface of the control shaft (4). The stop plate (6) is located inside the explosion-proof housing (1). The outer periphery of the gear shift disc (6) is provided with a first gear shift groove (8) and a second gear shift groove (9), which are spaced apart along the circumferential direction. The outer periphery of the gear shift disc (6) is provided with a first arc-shaped surface (10) and a second arc-shaped surface (11), which are located on the radial sides of the gear shift disc (6) and the second arc-shaped surface (11) and the second gear shift groove (9) are located on the other radial sides of the gear shift disc (6). The first arc-shaped surface (10) and the second arc-shaped surface (11) are connected by a smooth transition. A guide slide rod (12) is provided on the front side of the inner cavity of the explosion-proof housing (1). The guide slide rod (12) is slidably connected in the guide seat (13). The guide seat (13) is fixedly installed on the front side of the inner cavity of the explosion-proof housing (1). An abutment rod (14) is vertically fixedly installed on the upper end of the guide slide rod (12). The abutment rod (14) is in circumferential contact with the outer edge of the stop plate (6). A locking rod (15) is fixedly connected to the side of the guide slide rod (12). An interlocking block (16) is fixedly installed on the inner side of the door cover (3). The locking rod (15) and the interlocking block (16) are connected. When the abutting rod (14) abuts against the first arc-shaped surface (10), the locking rod (15) disengages from the interlocking block (16), and the door cover (3) can be opened freely; when the abutting rod (14) abuts against the second arc-shaped surface (11), the locking rod (15) engages with the side of the interlocking block (16), and the door cover (3) is locked and cannot be opened; a return spring (17) is sleeved on the outer surface of the guide slide rod (12), one end of the return spring (17) is connected to the guide seat (13), and the other end of the return spring (17) abuts against the stepped surface of the guide slide rod (12).

2. The interlocking mechanism for the housing of an explosion-proof mining equipment according to claim 1, characterized in that: The guide slide (12) includes two vertical guide rods and a horizontal connecting rod. The upper ends of the two vertical guide rods are vertically fixed to the lower surface of the horizontal connecting rod. The locking rod (15) is vertically fixed to the lower surface of the end of the horizontal connecting rod. The abutting rod (14) is vertically fixed to the upper surface of the horizontal connecting rod. One end of the return spring (17) is connected to the guide seat (13), and the other end of the return spring (17) abuts against the horizontal connecting rod.

3. The interlocking mechanism for the housing of an explosion-proof mining equipment according to claim 1, characterized in that: The outer surface of the abutment rod (14) is fitted with a limiting sleeve (18), which is fixedly installed on the front side of the inner cavity of the explosion-proof housing (1).

4. The interlocking mechanism for the housing of an explosion-proof mining equipment according to claim 1, characterized in that: An emergency stop button (19) is movably inserted through the front side of the explosion-proof housing (1). The emergency stop button (19) passes through the front side of the explosion-proof housing (1) and is slidably connected to the explosion-proof housing (1) through a guide sleeve. A limit block (20) is fixedly installed at the inner end of the emergency stop button (19). The limit block (20) is movably engaged with the first stop groove (8) and the second stop groove (9).

5. The interlocking mechanism for the housing of an explosion-proof mining equipment according to claim 4, characterized in that: A support base (21) is fixedly installed on the front side wall of the inner cavity of the explosion-proof housing (1). A micro switch (22) is fixedly installed on the support base (21). The sensing end of the micro switch (22) is in contact with the limit block (20).

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