A safety mechanism for an automatic explosion isolation device in a well

Abstract

The utility model discloses an insurance mechanism of underground automatic explosion-proof device relates to the field of coal mine explosion-proof safety. The insurance mechanism includes the protective shell, protective shell insurance pin, trigger device insurance pin, power transmission rod and axle sleeve, and power transmission rod is arranged in the axle sleeve and slides, and the axle sleeve is connected in the protective shell with screw threads. The first, second, third limit hole of co-axial is equipped on power transmission rod, axle sleeve and protective shell, and the second limit hole part is equipped with internal thread Mb, and the outer thread mb of insurance pin matches, and the front end of two insurance pins is locked by connecting thread Mc / mc, and one pin is screwed into the other pin, and it is ensured that one pin is locked all the time. When transporting, trigger device insurance pin locks power transmission rod, and when installing, protective shell insurance pin locks protective shell, and when disassembling, trigger device must be locked first. The utility model solves the problem that traditional insurance mechanism is easy to loosen and misfires, realizes the disassembly touch lock, reduces the operation uncertainty, is applicable to the gas / coal dust explosion protection in pit, and the safety and environmental adaptability are improved obviously.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof safety in underground coal mines, specifically to a safety mechanism for an automatic explosion-proof device in underground mines. Background Technology

[0002] The underground working environment in coal mines is complex, and gas and coal dust explosions are among the main safety threats. Automatic explosion-proof devices (AEDs) are widely used in coal mines and metal and non-metal mine roadways as a key protective device. Their core function is to receive the shock wave in the early stages of an explosion, convert it into axial motion, trigger the release of high-pressure gas, and instantly spray out extinguishing media (such as dry powder or water mist) to form an explosion barrier, extinguish the explosion flames, and prevent the propagation of shock waves and flames, thereby preventing the disaster from escalating and protecting the safety of personnel and equipment underground.

[0003] Traditional automatic explosion-proof devices for downhole drilling typically include a shock wave receiver, a trigger rod, a safety pin, and a extinguishing agent injection port. In standby mode, the device locks the trigger via a safety mechanism to prevent accidental triggering. When an explosion occurs, the shock wave pushes the trigger rod to release the safety, releasing the extinguishing agent. However, traditional safety mechanisms have significant drawbacks. First, the safety pin is usually locked only by inserting its tip into a sleeve, lacking anti-loosening measures. It is prone to detachment during downhole vibration, impact, or transportation, leading to safety failure and potential accidental triggering of the device in non-explosive situations, wasting extinguishing agents or causing secondary accidents. Second, traditional safety mechanisms fail to achieve "disassembly-touch interlocking," meaning that the locking state of the trigger during disassembly or maintenance depends on the operator's safety awareness and responsibility, introducing uncertainty. For example, if the operator does not insert the safety pin correctly, the device may be accidentally triggered during handling, causing personal injury or equipment damage. Furthermore, traditional safety pins can be easily removed by external tools, posing a risk of tampering and further reducing safety. Utility Model Content

[0004] In view of this, the purpose of this utility model is to solve the above problems and provide a safety mechanism for an automatic explosion-proof device for underground wells.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A safety mechanism for an automatic explosion-proof device for downhole mining includes a protective shell, a protective shell safety pin, a triggering device safety pin, a force transmission rod, and a bushing; the force transmission rod is slidably disposed within the bushing, and the bushing is threadedly connected to the protective shell; The force transmission rod is provided with a first limiting hole that penetrates radially, the bushing is provided with a second limiting hole that penetrates radially, and the protective shell is provided with a third limiting hole that penetrates radially. The first limiting hole, the second limiting hole, and the third limiting hole are coaxial. The second limiting hole has an internal thread Mb at one end near the protective shell safety pin, and both the trigger device safety pin and the protective shell safety pin have external threads mb that match the internal thread Mb; the front ends of the protective shell safety pin and the trigger device safety pin have connecting parts, and can be detachably connected through the connecting parts. The protective shell safety pin and the trigger device safety pin are interlocked. When either the protective shell safety pin or the trigger device safety pin is screwed in, the other safety pin is pushed out through the connecting part, ensuring that one safety pin is always in the locked state. When the trigger device safety pin is screwed in, the trigger device safety pin is screwed from one end of the third limiting hole into the second limiting hole and the first limiting hole. The external thread mb on the trigger device safety pin is connected to the internal thread Mb, and neither end of the trigger device safety pin protrudes from the outer cylindrical surface of the bushing, so that the force transmission rod is fixed and locked to the bushing. When the protective housing safety pin is screwed in, the protective housing safety pin is screwed into the second limiting hole from the other end of the third limiting hole. The external thread mb on the protective housing safety pin is connected to the internal thread Mb, and the protective housing safety pin does not extend into the first limiting hole, so that the protective housing and the bushing are fixedly locked.

[0006] Furthermore, the connection between the protective shell safety pin and the front end of the trigger device safety pin is a connecting thread, where one is an internal thread Mc and the other is a corresponding external thread mc.

[0007] Furthermore, both the protective shell safety pin and the trigger device safety pin are T-shaped, and the second and third limiting holes are stepped holes. The axial position of the protective shell safety pin and the trigger device safety pin is restricted by the large end face of the T-shape cooperating with the stepped end face of the stepped hole. Both the protective housing safety pin and the trigger device safety pin are fitted with spring washers. The spring washers are located between the large end face of the T-shaped part and the stepped end face of the stepped hole, providing a reverse force to prevent the threads from loosening.

[0008] Furthermore, both the protective housing safety pin and the trigger device safety pin have tool connecting parts at their tail ends, and are connected to disassembly and assembly tools through the tool connecting parts.

[0009] Furthermore, the tool connection part at the tail end of the protective shell safety pin and the trigger device safety pin are both internally threaded Ma. Utilizing the unidirectional action of the thread, the two safety pins can only achieve the disassembly and locking function by using disassembly and assembly tools, and neither safety pin can be disassembled individually.

[0010] Furthermore, the internal thread Ma is a standard thread.

[0011] Furthermore, both the internal thread Mb and the external thread mb are standard threads.

[0012] Furthermore, both the internal thread Mc and the external thread mc are non-standard threads.

[0013] A method for disassembling and locking an automatic explosion-proof device in a well, employing the safety mechanism described above, includes the following steps: In the transport state, the trigger device safety pin is screwed from one end of the third limiting hole into the second limiting hole and the first limiting hole, so that the external thread mb on the trigger device safety pin is connected with the internal thread Mb on the second limiting hole, ensuring that the two ends of the trigger device safety pin do not protrude from the outer cylindrical surface of the bushing, and locking the force transmission rod and the bushing. In the installation state, first put the protective shell into the force transmission rod and screw it into the bushing through the thread. Then, screw the protective shell safety pin into the second limit hole from the other end of the third limit hole, so that the external thread mb on the protective shell safety pin is connected with the internal thread Mb on the second limit hole. At the same time, connect the trigger device safety pin through the connecting part and push the trigger device safety pin out to lock the protective shell and unlock the trigger device. During operation, the protective casing remains locked to prevent disassembly; In the disassembled state, screw the trigger device safety pin into the first and second limit holes from one end of the third limit hole, so that the external thread mb on the trigger device safety pin is connected to the internal thread Mb on the second limit hole. At the same time, the protective shell safety pin is connected through the connecting part, and the protective shell safety pin is pushed out, so that the protective shell can only be unlocked after the trigger device is locked.

[0014] Furthermore, the screwing in and unscrewing out operations of the protective shell safety pin and the trigger device safety pin are both performed by connecting the tool connection part at the tail end of the protective shell safety pin and the trigger device safety pin to the disassembly tool.

[0015] Furthermore, during any state switch, ensure that at least one of the protective housing safety pin and the trigger device safety pin locks the second limit hole to prevent accidental unlocking or false triggering.

[0016] The beneficial effects of this utility model are as follows: This invention has significant advantages over traditional technologies: 1. High safety and reliability: The safety pin of the triggering device passes completely through the force transmission rod, and combined with the spring pad anti-loosening design, it significantly improves the safety margin of the safety mechanism. Even in environments with strong downhole vibrations, the safety pin can remain stably locked, avoiding resource waste or secondary accidents caused by accidental triggering.

[0017] 2. Interlocking Function: The interlocking design of the protective housing safety pin and the trigger device safety pin ensures that one safety pin is always locked when screwed in, as screwing in one pin pushes the other out. During operation, the protective housing is locked to prevent disassembly; during disassembly, the trigger device must be locked before the protective housing can be unlocked, eliminating the risk of accidental triggering due to operator negligence and ensuring safety during downhole operations.

[0018] 3. Tamper-proof and operational standardization: The safety pin's connecting part uses a non-standard thread Mc / mc, while the tool connecting part uses a standard internal thread Ma, allowing operation only with specialized tools to prevent unauthorized disassembly or tampering. The T-shaped safety pin mates with the stepped hole to restrict axial movement, further enhancing structural stability.

[0019] In summary, this invention effectively solves the problems of safety and interlocking uncertainty in traditional safety mechanisms, improves device reliability, reduces accident risks, and provides a solid guarantee for downhole safety.

[0020] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a diagram showing the installation status of the protective shell safety pin in this utility model.

[0022] Figure 2 This is a diagram showing the installation status of the safety pin of the trigger device in this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of the bushing of this utility model.

[0024] Figure 4 This is a schematic diagram of the protective shell in this utility model.

[0025] Figure 5 This is a schematic diagram of the protective shell safety pin in this utility model.

[0026] Figure 6 This is a schematic diagram of the safety pin of the triggering device in this utility model.

[0027] Reference numerals: 1-Protective shell; 2-Spring washer; 3-Protective shell safety pin; 4-Trigger device safety pin; 5-Spring washer; 6-Force transmission rod; 7-Shaft sleeve; 8-Connecting nut. Detailed Implementation

[0028] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0030] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0031] Example 1 like Figures 1-6 As shown, this embodiment provides a safety mechanism for an automatic explosion-proof device in underground mines, which is suitable for rapid explosion-proof protection against gas or coal dust explosions in underground coal mine roadways. The safety mechanism includes a protective shell 1, a spring pad 2, a protective shell safety pin 3, a triggering device safety pin 4, a spring pad 5, a force transmission rod 6, a bushing 7, and a connecting nut 8.

[0032] The force transmission rod 6 is slidably disposed within the bushing 7, which is connected to the protective shell 1 via an external thread md and an internal thread Md. The force transmission rod 6 has a first radially penetrating limiting hole, the bushing 7 has a second radially penetrating limiting hole, and the protective shell 1 has a third radially penetrating limiting hole. The first, second, and third limiting holes are coaxial. The end of the second limiting hole near the protective shell safety pin 3 has an internal thread Mb, and both the protective shell safety pin 3 and the trigger device safety pin 4 have external threads mb that match the internal thread Mb. The front ends of the protective shell safety pin 3 and the trigger device safety pin 4 have connecting parts, which can be detachably connected via the connecting parts (one with an internal thread Mc and the other with a corresponding external thread mc, preferably a non-standard thread) to achieve mutual locking. Both the protective shell safety pin 3 and the trigger device safety pin 4 are T-shaped, and the second and third limiting holes are stepped holes. The large end face of the T-shape mates with the stepped end face of the stepped hole, restricting the axial position of the safety pin. Spring washers 2 and 5 are respectively fitted onto the protective housing safety pin 3 and the trigger device safety pin 4, located between the large end face of the T-shaped pin and the stepped end face of the stepped hole, providing a counterforce to prevent loosening of the threads. The tail end of the safety pin is provided with a tool connection part (internal thread Ma, preferably a standard thread), which allows only special tools to be connected for operation.

[0033] In the factory and shipping condition: the trigger device safety pin 4 is screwed into the second and first limit holes from one end of the third limit hole, with the external thread mb connected to the internal thread Mb, and neither end protruding from the outer cylindrical surface of the bushing 7, locking the force transmission rod 6 to the bushing 7 to prevent the trigger device from malfunctioning. The protective shell 1 can rotate relative to the bushing 7, facilitating transportation and initial assembly.

[0034] In the downhole installation and operation state: First, fit the protective shell 1 onto the force transmission rod 6 and screw it into the bushing 7 via threads. Connect the two force transmission rods 6 using the connecting nut 8. Then, screw the protective shell safety pin 3 into the second limit hole from the other end of the third limit hole, with the external thread mb connecting to the internal thread Mb, but not extending into the first limit hole. Simultaneously, push the trigger device safety pin 4 out through the connecting part (Mc / mc), thus fixing and locking the protective shell 1 and the bushing 7, and unlocking and unlocking the force transmission rod 6. The protective shell 1 covers the connecting nut 8 to prevent disassembly during operation.

[0035] In the disassembly state: the trigger device safety pin 4 is screwed into the first and second limit holes from one end of the third limit hole. The external thread mb is connected to the internal thread Mb. The two ends do not protrude from the outer cylindrical surface of the bushing 7. At the same time, the protective shell safety pin 3 is pushed out through the connecting part (Mc / mc). The protective shell 1 can only be unlocked after the force transmission rod 6 is locked with the bushing 7, which facilitates safe disassembly.

[0036] The specific usage method of this embodiment is as follows: The device is shipped in transport condition with the trigger device safety pin 4 locked. Before downhole installation, the condition is checked using a special tool via the tool connection section (Ma). First, assemble the force transmission rod 6 and bushing 7, and connect the multiple sections of the force transmission rod 6 using the connecting nut 8. Screw the protective shell 1 into the bushing 7, then screw in the protective shell safety pin 3, simultaneously pushing out the trigger device safety pin 4. After installation, the device enters the operating state, and the protective shell 1 is locked to prevent disassembly. In the event of an explosion, the shock wave drives the force transmission rod 6 to move axially, triggering the explosion-proof mechanism to release the extinguishing medium. During disassembly, the trigger device safety pin 4 must be screwed in to lock the force transmission rod 6 before the protective shell safety pin 3 can be unscrewed to disassemble the protective shell 1 and connecting nut 8.

[0037] Example 2 like Figures 1-6 As shown, this embodiment provides a safety mechanism for an automatic explosion-proof device in underground mines, suitable for metal and non-metal mines or environments with higher vibration intensity. The structure is basically the same as that of Embodiment 1, including a protective shell 1, a spring pad 2, a protective shell safety pin 3, a trigger device safety pin 4, a spring pad 5, a force transmission rod 6, a bushing 7, and a connecting nut 8. The difference lies in the material reinforcement and size adjustment to improve durability.

[0038] The core structure of the safety mechanism is the same as in Example 1. The internal thread Mb and external thread mb of the second limiting hole are reinforced standard threads, while the connecting part Mc / mc is a high-strength non-standard thread. The force transmission rod 6, bushing 7, and protective shell 1 are made of corrosion-resistant high-strength alloy steel (e.g., with added chromium and molybdenum). The outer diameter of bushing 7 is increased to 80mm, and the diameter of force transmission rod 6 is increased to 50mm to withstand higher impacts. Spring pads 2 and 5 are made of high-elasticity stainless steel, increasing the reverse force by 20%. The large end diameter of the T-shaped safety pin is increased to 40mm, and the stepped hole is correspondingly enlarged to ensure more stable axial restraint. The tool connecting part Ma has a deepened standard internal thread for easy operation with heavy-duty special tools.

[0039] The operating logic for the factory and transportation status, installation and operation status, and disassembly status is the same as that in Example 1, but due to the material reinforcement, it is suitable for environments with higher vibration frequencies (such as blasting operation areas in metal mines).

[0040] Specific usage instructions: The device is suitable for mines with wider roadways. Before installation, confirm the transport condition and ensure it is securely locked. During assembly, use connecting nut 8 to connect the reinforced force transmission rod 6 and screw in the enlarged protective shell 1. During operation, the protective shell 1 locks and covers the connecting nut 8. During disassembly, enforce the interlocking sequence to ensure safety.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A safety mechanism for an automatic explosion-proof device for underground mining, characterized in that, It includes a protective shell, a protective shell safety pin, a trigger device safety pin, a force transmission rod, and a bushing; the force transmission rod is slidably disposed within the bushing, and the bushing is threadedly connected to the protective shell; The force transmission rod is provided with a first limiting hole that penetrates radially, the bushing is provided with a second limiting hole that penetrates radially, and the protective shell is provided with a third limiting hole that penetrates radially. The first limiting hole, the second limiting hole, and the third limiting hole are coaxial. The second limiting hole has an internal thread Mb at one end near the protective shell safety pin, and both the trigger device safety pin and the protective shell safety pin have external threads mb that match the internal thread Mb; the front ends of the protective shell safety pin and the trigger device safety pin have connecting parts, and can be detachably connected through the connecting parts. The protective shell safety pin and the trigger device safety pin are interlocked. When either the protective shell safety pin or the trigger device safety pin is screwed in, the other safety pin is pushed out through the connecting part, ensuring that one safety pin is always in the locked state. When the trigger device safety pin is screwed in, the trigger device safety pin is screwed from one end of the third limiting hole into the second limiting hole and the first limiting hole. The external thread mb on the trigger device safety pin is connected to the internal thread Mb, and neither end of the trigger device safety pin protrudes from the outer cylindrical surface of the bushing, so that the force transmission rod is fixed and locked to the bushing. When the protective housing safety pin is screwed in, the protective housing safety pin is screwed into the second limiting hole from the other end of the third limiting hole. The external thread mb on the protective housing safety pin is connected to the internal thread Mb, and the protective housing safety pin does not extend into the first limiting hole, so that the protective housing and the bushing are fixedly locked.

2. The insurance institution according to claim 1, characterized in that, The connection between the protective shell safety pin and the front end of the trigger device safety pin is a connecting thread. When one of them is an internal thread Mc, the other is a corresponding external thread mc.

3. The insurance institution according to claim 2, characterized in that, The protective shell safety pin and the trigger device safety pin are both T-shaped. The second limiting hole and the third limiting hole are both stepped holes. The axial position of the protective shell safety pin and the trigger device safety pin is restricted by the large end face of the T-shape cooperating with the stepped end face of the stepped hole. Both the protective housing safety pin and the trigger device safety pin are fitted with spring washers. The spring washers are located between the large end face of the T-shaped part and the stepped end face of the stepped hole, providing a reverse force to prevent the threads from loosening.

4. The insurance institution according to claim 1, characterized in that, Both the protective housing safety pin and the trigger device safety pin have tool connecting parts at their tail ends, and are connected to disassembly and assembly tools through the tool connecting parts.

5. The insurance institution according to claim 2, characterized in that, Both the safety pin of the protective shell and the tool connection at the tail end of the safety pin of the triggering device have internal threads (Ma).

6. The insurance institution according to claim 5, characterized in that, The internal thread Ma is a standard thread.

7. The insurance institution according to claim 1, characterized in that, Both the internal thread Mb and the external thread mb are standard threads.

8. The insurance institution according to claim 2, characterized in that, Both the internal thread Mc and the external thread mc are non-standard threads.

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