CN110454161B - Multi-pulse gas explosion pre-splitting equipment for coal mine development - Google Patents

Abstract

The present invention is a multi-pulse gas explosion pre-splitting equipment for coal mine development. The present invention sets multiple low-trigger-point initiation sections A, medium-trigger-point initiation sections B, and high-trigger-point initiation sections C, which are arranged at intervals from each other; After that, the low trigger point initiating section A in the upper part detonates first, and after the low trigger point detonating section A detonates, the middle trigger point detonating section B detonates, and then the middle trigger point detonating section B detonates and then triggers the adjacent high trigger point. The point initiation section C is detonated, which can well realize the multi-pulse initiation pre-split of the coal seam, improve the fracture performance of the pre-split position, and facilitate the subsequent gas extraction. By setting the detonation valves with different required energy or required detonation pressure, the invention realizes the control of different initiation times for the initiation section A of the low trigger point, the initiation section B of the middle trigger point and the initiation section C of the high trigger point, and realizes detonation in sequence. The multi-pulse detonation is guaranteed to be carried out in sequence and the pre-splitting capability is improved, and the invention can conveniently realize the multi-pulse gas explosion pre-splitting.

Description

A multi-pulse gas explosion pre-splitting equipment for coal mine development

technical field

The invention relates to the technical field of blasting devices, in particular to a multi-pulse gas explosion pre-splitting device used in coal mine development.

Background technique

For coal mining, in order to release gas such as gas in the coal seam quickly and facilitate the drilling and mining of the coal seam, it is generally necessary to pre-split the coal seam of the coal mine. Pre-splitting can effectively generate cracks, and these cracks can be very good. It helps gas extraction and facilitates subsequent coal seam mining and cutting. The current pre-splitting methods mainly include high-pressure water pre-splitting and blasting pre-splitting. For blasting pre-splitting, it generally uses the impact of carbon dioxide phase change expansion. To achieve the purpose of pre-splitting to increase cracks.

However, for the pre-splitting of coal seams, the liquid carbon dioxide blasting device used in the existing blasting device can generally only achieve one-time blasting, and cannot achieve multiple rhythmic multi-pulse blasting, which leads to cracks in the blasting part during blasting. If it is larger, it will have an adverse effect on the safety of coal seam support, or the cracks are small, and it is difficult to achieve a large-scale pre-cracking effect, which will affect the mining capacity of coal mines.

Therefore, the present invention provides a multi-pulse gas explosion pre-splitting equipment for coal mine development, so as to solve the problems raised in the above-mentioned background art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a multi-pulse gas explosion pre-splitting equipment for coal mine development, so as to solve the problems raised in the above-mentioned background technology.

To achieve the above object, the present invention provides the following technical solutions:

A multi-pulse gas explosion pre-splitting equipment for coal mine development includes a detonator, an upper centralizer, a lower centralizer and a multi-pulse gas explosion fracturing section, wherein the detonator is installed on the top of the upper centralizer, so the The multi-pulse gas explosion fracturing section is connected between the upper centralizer and the lower centralizer; the multi-pulse gas explosion fracturing section includes a liquid filling section of a tubular structure and a connection control section of the tubular structure, which are adjacent to each other. The two liquid filling sections of the tubular structure are connected together by the connection control section; it is characterized in that, the liquid filling section at least includes a plurality of low trigger point initiation sections A and middle trigger point initiation sections B arranged at intervals from each other and high trigger point detonation section C; and after the detonator triggers detonation, the low trigger point detonation section A in the upper part detonates first, and the middle trigger point can be triggered only after the low trigger point detonation section A detonates The detonation section B is detonated, and then the middle trigger point detonation section B is detonated to trigger the adjacent high trigger point detonation section C to detonate.

Further, preferably, the multi-pulse gas explosion fracturing section is provided with a detonation lead located in the center and extending along its axial direction, and the detonation lead can directly trigger the low trigger point detonation section A to detonate.

Further, preferably, one end of the liquid filling section is provided with a first threaded connection post of a tubular structure, and the other end of the liquid filling section is provided with a second threaded connection post of a tubular structure; The detonation liquid is installed in the body, and the outer periphery of the liquid filling section is provided with a plurality of axially extending notches, and a plurality of injection holes are arranged on the notches, and the injection holes are provided with the necessary components for controlling the detonation. Detonation valve of energy size or desired detonation pressure.

Further, preferably, both ends of the connection control section are provided with threaded holes for threaded connection with the first threaded connection column or the second threaded connection column, and the bottom wall of the threaded hole is provided with the detonating lead wire and the first threaded connection post or the second threaded connection post is sleeved with a sealing connection ring.

Further, preferably, at least two radially extending connecting pipe columns are respectively provided on the first threaded connection column and/or the second threaded connection column of the connection control section, and both ends of the connection control section correspond to the The position of the connecting pipe column is provided with an accommodating card slot, the connecting pipe string can be inserted into the accommodating card groove, and the accommodating card grooves at both ends of the connection control section are connected by a trigger hole. There is a trigger rod. When the low trigger point detonation section A or the middle trigger point detonation section B is detonated, the detonation impact energy can make the trigger rod generate heat, and the heat of the trigger rod is applied to the middle trigger point detonation section B or high trigger point. Detonating section C, and can trigger middle trigger point detonation section B or high trigger point detonation section C to detonate.

Further, preferably, no trigger rod is provided in the trigger hole on the connection control section between the high trigger point initiation section C and the low trigger point initiation section A.

Further, preferably, the number of trigger rods on the connection control section between the low trigger point initiation section A and the middle trigger point initiation section B is less than the middle trigger point initiation section B and the high trigger point initiation section C. The connection between controls the number of trigger bars on the segment.

Further, preferably, the first threaded connection column or the second threaded connection column is provided with a radially through radial installation hole at the position where the connection pipe column is installed, and the radial inner side of the radial installation hole is provided with a an air outlet hole, the first spring is sleeved in the radial installation hole, one end abuts the air outlet hole, and the other end is abutted and connected to a connecting pipe string, and the connecting pipe string is a T-shaped structure.

Further, preferably, a clamping block is arranged in the accommodating card slot, a radially extending guide column is arranged on the radial outer side of the accommodating card slot, a second spring is sleeved on the guide column, and the clamping block is A limit slide shoulder is connected to the radial outer side, the limit slide shoulder is slidably fitted on the guide column, and is pressed against by the second spring, and is provided between the clamping block and the inner wall of the accommodating slot. There is a gap, and the connecting pipe column is abutted and connected to the clamping block by the second spring.

Further, preferably, the detonation valve structure of the liquid filling section is configured to sequentially increase the detonation temperature or required detonation energy of the low trigger point detonation section A, the middle trigger point detonation section B and the high trigger point detonation section C.

Compared with the prior art, the beneficial effects of the present invention are:

1. The present invention arranges multiple low-trigger-point detonating sections A, middle-trigger-point detonating sections B and high-trigger-point detonating sections C arranged at intervals from each other; in this way, after the detonator triggers detonation, the low-trigger point detonating section in the upper part is A detonates first, and the low trigger point detonation section A detonates before the middle trigger point detonation section B detonates, and then the middle trigger point detonation section B detonates to trigger the adjacent high trigger The point initiation section C is detonated, so that the multi-pulse initiation pre-split of the coal seam can be well achieved, the fracture performance of the pre-split part is improved, and the subsequent gas extraction is facilitated.

2. The present invention realizes the control of different initiation times for the initiation section A of the low trigger point, the initiation section B of the middle trigger point, and the initiation section C of the high trigger point by setting detonation valves with different required energy sizes or required initiation pressures, and realizes sequential control. Detonation ensures that the multi-pulse detonation is carried out in an orderly manner and improves the pre-splitting ability. The invention can conveniently realize the multi-pulse gas explosion pre-splitting.

Description of drawings

Fig. 1 is a kind of overall appearance structure schematic diagram of multi-pulse gas explosion pre-splitting equipment used in coal mine development;

Fig. 2 is a schematic diagram of a partial structure of a multi-pulse gas explosion fracturing section using multi-pulse gas explosion pre-cracking equipment for coal mine development;

Fig. 3 is a partial enlarged structural schematic diagram of a part of a multi-pulse gas explosion fracturing section of a coal mine with multi-pulse gas explosion pre-cracking equipment;

Fig. 4 is a kind of enlarged structural schematic diagram of place A in Fig. 3 in the multi-pulse gas explosion pre-splitting equipment used in coal mine development;

Figure 5 is a schematic structural diagram of a liquid loading section in a multi-pulse gas explosion pre-splitting equipment used in coal mine development.

Detailed ways

Please refer to FIGS. 1 to 5. In the embodiment of the present invention, a multi-pulse gas explosion pre-fracture equipment is used for coal mine development, including a detonator 4, an upper centralizer 1, a lower centralizer 21 and a multi-pulse gas explosion fracturing section, wherein , the detonator 4 is installed on the top of the upper centralizer 1, and the multi-pulse gas explosion fracturing section is connected between the upper centralizer 1 and the lower centralizer 21; the multi-pulse gas explosion pressure The split section includes a tubular structure liquid filling section 3 and a tubular structure connection control section 2, and two adjacent tubular structure liquid filling sections 3 are connected together by the connection control section 2; it is characterized in that the The liquid filling section 3 at least includes a plurality of low-trigger-point detonation sections A, middle-trigger-point detonation sections B and high-trigger-point detonation sections C, which are arranged at intervals from each other; and after the detonator 4 is triggered and detonated, the low trigger point in the upper The point detonation segment A detonates first, and only after the low trigger point detonation segment A detonates can the middle trigger point detonation segment B detonate, and after the middle trigger point detonation segment B detonates, it can trigger all adjacent ones. The high trigger point detonation section C detonates.

In this embodiment, the multi-pulse gas explosion fracturing segment is provided with a detonating lead located in the center and extending along its axial direction, and the detonating lead can directly trigger the low trigger point detonating segment A to detonate.

As a preferred embodiment, one end of the liquid filling section 3 is provided with a first threaded connection column 5 with a tubular structure, and the other end of the liquid filling section 3 is provided with a second threaded connection column 6 with a tubular structure; The inner cavity 7 of the liquid filling section 3 is equipped with a detonating liquid, and the outer periphery of the liquid filling section 3 is provided with a plurality of axially extending notches 10, and a plurality of injection holes are arranged on the notches, so The injection hole is provided with a detonation valve for controlling the amount of energy required for detonation or the required detonation pressure.

The two ends of the connection control section 2 are provided with threaded holes 11 and 12 that are threadedly connected to the first threaded connection column 5 or the second threaded connection column, and the bottom wall of the threaded hole is provided with a threaded hole for the detonation. A small hole through which the lead wire passes; and a sealing connection ring 9 is sleeved on the first threaded connection post 5 or the second threaded connection post.

In the present invention, at least two radially extending connecting pipe columns 8 are respectively provided on the first threaded connection column 5 and/or the second threaded connection column of the connection control section 2 . An accommodating slot 24 is provided at the position of the end corresponding to the connecting pipe column 8 , and the connecting pipe column can be inserted into the accommodating slot 24 , and there is a gap between the accommodating slots 24 at both ends of the connection control section 2 . The trigger hole is connected, and a trigger rod is arranged in the trigger hole. When the low trigger point detonation section A or the middle trigger point detonation section B is detonated, the detonation impact energy can make the trigger rod generate heat, and the heat of the trigger rod is applied to the middle trigger point. Point detonation section B or high trigger point detonation section C, and can trigger middle trigger point detonation section B or high trigger point detonation section C to detonate.

As a preferred embodiment, no trigger rod is provided in the trigger hole on the connection control section 2 between the high trigger point initiation section C and the low trigger point initiation section A. The number of trigger rods on the connection control section 2 between the low trigger point initiation section A and the middle trigger point initiation section B is less than the connection between the middle trigger point initiation section B and the high trigger point initiation section C Controls the number of trigger bars on segment 2.

Wherein, the first threaded connection post 5 or the second threaded connection post is provided with a radially penetrating radial installation hole 14 at the position where the connection pipe post 8 is installed, and the radial inner side of the radial installation hole 14 is provided There is an air outlet hole 26, the first spring 15 is sleeved in the radial installation hole, one end abuts the air outlet hole, and the other end is abutted and connected with the connecting pipe string 8, and the connecting pipe string 8 is T-shaped structure.

The accommodating slot 24 is provided with a clamping block 17 , the radially outer side of the accommodating slot 24 is provided with a radially extending guide post 18 , and a second spring 20 is sleeved on the guide post. A limit slide shoulder 19 is connected to the radial outer side. The limit slide shoulder slidably fits on the guide column and is pressed against by the second spring. A gap 16 is provided between, and the connecting pipe column is abutted and connected to the clamping block through the second spring. The detonation valve structure of the liquid filling section 3 is set to increase the detonation temperature or required detonation energy of the low trigger point detonation section A, the middle trigger point detonation section B and the high trigger point detonation section C sequentially.

In the present invention, a plurality of low-trigger point initiation sections A, middle-trigger-point initiation sections B and high-trigger-point initiation sections C are arranged at intervals. Detonation, and the low trigger point detonation section A can trigger the middle trigger point detonation section B to detonate, and then the middle trigger point detonation section B can trigger the adjacent high trigger point detonation after the detonation section B detonates Section C is detonated, so that the multi-pulse detonation pre-split of the coal seam can be well achieved, the fracture performance of the pre-split part is improved, and the subsequent gas extraction is facilitated. By setting the detonation valves with different required energy or required detonation pressure, the invention realizes the control of different initiation times for the initiation section A of the low trigger point, the initiation section B of the middle trigger point and the initiation section C of the high trigger point, and realizes detonation in sequence. The multi-pulse detonation is guaranteed to be carried out in sequence and the pre-splitting ability is improved, and the invention can conveniently realize the multi-pulse gas explosion pre-splitting.

The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The equivalent replacement or modification of the solution and its inventive concept shall be included within the protection scope of the present invention.

Claims (6)

1. A multi-pulse gas explosion pre-splitting device for coal mine development, comprising a detonator (4), an upper centralizer (1), a lower centralizer (21) and a multi-pulse gas explosion fracturing section, wherein the detonator (4) Installed on the top of the upper centralizer (1), the multi-pulse gas explosion fracturing section is connected between the upper centralizer (1) and the lower centralizer (21); The gas explosion fracturing section includes a liquid filling section (3) of a tubular structure and a connection control section (2) of the tubular structure, and the two adjacent liquid filling sections (3) of the tubular structure adopt the connection control section ( 2) connected together; it is characterized in that, the liquid filling section (3) at least includes a plurality of low trigger point detonation sections A, middle trigger point detonation sections B and high trigger point detonation sections C arranged at intervals from each other; and the detonation section After the device (4) is triggered and detonated, the low trigger point detonation section A at the upper part detonates first, and only after the low trigger point detonation section A is detonated can the middle trigger point detonation section B be detonated, and then the middle trigger point detonation section B is detonated. After the trigger point detonation section B is detonated, the adjacent high trigger point detonation section C can be detonated; The multi-pulse gas explosion fracturing section is provided with a detonating lead located in the center and extending along its axial direction, and the detonating lead can directly trigger the low trigger point detonating section A to detonate; One end of the liquid filling section (3) is provided with a first threaded connection column (5) with a tubular structure, and the other end of the liquid filling section (3) is provided with a second threaded connection column (6) with a tubular structure; The inner cavity (7) of the liquid filling section (3) is provided with a detonating liquid, and the outer periphery of the liquid filling section (3) is provided with a plurality of axially extending slots (10). A plurality of injection holes are arranged on the mouth, and a detonation valve for controlling the energy required for detonation or the required detonation pressure is arranged in the injection holes; Both ends of the connection control section (2) are provided with threaded holes (11, 12) that are threadedly connected to the first threaded connection column (5) or the second threaded connection column, and the bottom wall of the threaded hole is provided with a threaded hole (11, 12). A small hole for the detonating lead to pass through; and a sealing connection ring (9) is sleeved on the first threaded connection post (5) or the second threaded connection post; At least two radially extending connecting pipe columns (8) are respectively provided on the first threaded connection column (5) and/or the second threaded connection column of the connection control section (2). ) are provided with accommodating slots (24) at positions corresponding to the connecting pipe string (8), the connecting pipe string can be inserted into the accommodating groove (24), and the connection control section (2) The accommodating slots at both ends are also connected by a trigger hole, and a trigger rod is arranged in the trigger hole. When the low trigger point detonation section A or the middle trigger point detonation section B is detonated, the impact energy of the detonation can make the trigger rod generate heat , and the heat of the trigger rod is applied to the middle trigger point detonation section B or the high trigger point detonation section C, and can trigger the middle trigger point detonation section B or the high trigger point detonation section C to detonate. 2. a kind of coal mine development according to claim 1 adopts multi-pulse gas explosion pre-splitting equipment, it is characterized in that, the connection control section (2) between described high trigger point detonation section C and low trigger point detonation section A The trigger rod is not set in the trigger hole on the 3. a kind of coal mine development according to claim 1 adopts multi-pulse gas explosion pre-splitting equipment, it is characterized in that, the connection control section (2) between described low trigger point detonation section A and middle trigger point detonation section B The number of trigger rods on the upper part is less than the number of trigger rods on the connection control section (2) between the middle trigger point initiation section B and the high trigger point initiation section C. 4. The multi-pulse gas explosion pre-splitting equipment used for coal mine development according to claim 1, characterized in that, the first threaded connection column (5) or the installation of the second threaded connection column ( 8) is provided with a radially through radial mounting hole (14), the radial inner side of the radial mounting hole (14) is provided with an air outlet hole (26), and the first spring (15) is sleeved on the said radial mounting hole (14). One end of the radial installation hole is abutted against the air outlet hole, and the other end is abutted and connected to a connecting pipe string (8), and the connecting pipe string (8) has a T-shaped structure. 5 . The multi-pulse gas explosion pre-splitting equipment for coal mine development according to claim 1 , wherein a clamping block (17) is arranged in the accommodating slot (24), and the accommodating slot (24) is provided with a clamping block (17). A radially extending guide post (18) is provided on the radially outer side of the block ), a second spring (20) is sleeved on the guide post, and a limiting sliding shoulder (19) is connected on the radially outer side of the clamping block, so The limit sliding shoulder is slidably fitted on the guide post and is pressed against by the second spring, and a gap (16) is provided between the clamping block and the inner wall of the accommodating clamping slot (24), through which The second spring enables the connecting pipe column to be abutted and connected to the clamping block. 6. The multi-pulse gas explosion pre-splitting equipment used for coal mine development according to claim 1, wherein the detonation valve structure of the liquid charging section (3) is set as the low trigger point detonation section A, middle The initiation temperature or required initiation energy of the initiation section B of the trigger point and the initiation section C of the high trigger point are increased in sequence.

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