CN217303756U - Allowable electronic detonator and detonation system suitable for underground coal mine - Google Patents

Abstract

The utility model discloses an allowable electronic detonator and a detonation system which are suitable for underground coal mines, wherein the electronic detonator comprises an electronic ignition element and a basic detonator; the electronic ignition element consists of a pin wire, a chip module and an ignition structure; the chip module adopts an intrinsic safety type electronic control circuit, and the input end of the chip module is provided with a safety protection diode; and the chip module is provided with a delay setting unit which can set a plurality of delay times which are all less than 130 ms. The initiation system includes an initiator having a delay time setting unit. The utility model has the advantages that the electronic detonator is of intrinsic safety type, the delay precision is high, the delay time is convenient to obtain, and the safety guarantee is provided for the use of the detonator allowed for coal; the priming system is suitable for the electronic detonator.

Description

Allowable electronic detonator and detonation system suitable for underground coal mine

Technical Field

The utility model relates to an electron detonator structure, especially a be adapted to permissible type electron detonator in colliery in the pit and priming system.

Background

In recent years, in order to meet the structural adjustment requirements of the civil explosion industry, electronic detonators need to be popularized vigorously to promote the upgrading and transformation of the civil explosion industry with safe and excellent new products. Based on the basic research and development innovation which are constantly carried out by tens of technical personnel in the industry and the combination of public safety factors and the continuous maturity of relevant chip modules and matched industrial chain core equipment technology, the digital electronic detonator service with characteristics is formed.

With the rapid development of the application technology of the electronic detonator, the technical bottleneck of the electronic detonator product in a complex environment is overcome continuously, the product quality also tends to be mature, but the application of the electronic detonator in the special environment of underground coal mine blasting is not realized. The reason is that the safety requirement of underground coal mine blasting on blasting equipment is extremely high, a chip module is arranged in the electronic detonator, the product structure is changed, and the safety is not fully demonstrated. Therefore, the coal mine is still adopted to permit electric detonators to explode at present, and the technical level of civil explosion industry and the comprehensive popularization and application of the electric detonators are seriously restricted.

Chinese patent publication No. CN210862407U, published as 2020, 6 and 5, discloses a coal mine permitted electronic detonator, which achieves the purpose of delay control by arranging an equal delay barrier device, i.e., equal length delay explosive columns of the same type. The method has the following defects that firstly, the charging process of the delay powder is increased during production, and the workload is increased; and secondly, the delay time precision is controlled by the characteristics of the explosive and the charging length, so that the delay time precision is difficult to be fully ensured. For this reason, further improvements are required for the electronic detonator.

Disclosure of Invention

The utility model discloses a first purpose is to be difficult to really satisfy the not enough of the allowable requirement of colliery environment in the pit to current electronic detonator, provide one kind and be adapted to the allowable type electronic detonator in colliery in the pit, its chip module adopts this ampere of type electronic control circuit, and the chip module has a plurality of confessions and selects the setting, and all be less than the delay setting unit of 130ms delay time quantum, make it can satisfy the security requirement in colliery in the pit, still can obtain delay time through setting up the mode on the control circuit of detonator, obtain delay time's physical structure in order to replace delay separation device such as adoption, delay time's acquisition time has not only been shortened, delay precision has still been improved, the accuracy of its detonating moment control has been ensured, quality and safety for the coal blasting in the pit provide the guarantee. The second objective of the present invention is to provide a detonation system with the aforesaid electronic detonator suitable for underground coal mine allowable use for controlling the detonation of the aforesaid electronic detonator.

In order to achieve the first objective, the present invention adopts the following technical solution.

An allowable electronic detonator applicable to underground coal mines comprises an electronic ignition element and a basic detonator; the electronic ignition element consists of a pin wire, a chip module and an ignition structure; the chip module adopts an intrinsic safety type electronic control circuit, and safety protection diodes are respectively arranged between two input end electrodes of the chip module and the electronic circuit of the chip module; and the chip module is provided with a delay setting unit which can set a plurality of delay times which are all less than 130 ms.

According to the electronic detonator adopting the scheme, the chip module adopts the intrinsic safety type electronic control circuit, the safety protection diode is arranged between the electrode at the input end of the chip module and the electronic circuit, the delay time setting unit is provided with a plurality of delay time setting units which are selected and delay time less than 130ms, so that the safety protection diode can meet the safety requirement of an underground coal mine, the delay time can be obtained on the control circuit of the detonator in a setting mode to replace a physical structure for obtaining the delay time by adopting an equal-time delay separation device, compared with the electronic detonator, the obtaining time of the delay time is shortened, the delay precision is improved, the accuracy of detonation moment control is ensured, and safety guarantee is provided for underground coal allowable detonators. Wherein the deferral time should have 5 or more alternative times, the 5 times including 0ms, 25ms, 50ms, 75ms, and 100 ms; more, 125ms may also be included. The interval of 25ms between every two selectable time periods can fully meet the requirement of normal networking of the electronic detonator designed for blasting. When the delay time is 0ms, the delay time is equivalent to no delay.

Preferably, the base detonator comprises a steel shell; the chip module is packaged by injection molding, and a conductive spring piece is arranged between the packaging layer and the steel tube shell. The steel tube shell is communicated with the packaging layer of the chip module through the conductive spring pieces, static electricity on the chip module is eliminated, and therefore the anti-electromagnetic interference performance is improved, and the intrinsic safety performance of the detonator is further improved. The corrosion resistance of the steel pipe shell can be improved by surface treatment such as bluing or copper plating, and the storage time can be prolonged.

Preferably, the ignition structure is composed of a patch type bridge wire, a patch type resistor, a patch type energetic material or a semiconductor bridge, and is connected with the output end of the chip module in an SMT mode. The ignition structure with different forms is adopted, so that the convenience of purchasing related accessories in detonator production is realized, and the production cost is reduced. Wherein, the patch type bridge wire and the patch type resistor are required to be stained with explosive to form a explosive head; the patch type energetic material and the semiconductor bridge do not need to be stained with medicine; the patch type energetic material can excite the built-in chemical energy to form flame or flame after certain electric energy is conducted, and the semiconductor bridge can form sparks after the electric energy is conducted, so that the purpose of detonating the explosive can be achieved.

Preferably, the basic detonator is of a three-layer charging structure, the first layer of explosive and the second layer of explosive are both graphite granulation hexogen explosives containing a flame retardant, the content ratio of the flame retardant in the second layer of explosive is larger than that of the first layer of explosive, and the third layer of explosive is a detonating explosive consisting of nickel hydrazine nitrate. The raw material of nickel hydrazine nitrate is easy to obtain, the synthesis process is simple, the convenience of detonator manufacture is improved, the manufacture cost is reduced, and meanwhile, the flame suppressor is added into the graphite granulated hexogen explosive to ensure that the allowable safety requirement of underground coal mine use is met. The explosive protection pipe cap is preferably tightly matched with the inner hole of the shell of the basic detonator, so that the three layers of explosives are tightly limited in the corresponding pipe sections, and the explosive explosion power is ensured. When the shell is made of steel, the explosive protection cap is preferably made of steel.

Further preferably, the flame suppressor is composed of cryolite; wherein the cryolite content in the first layer of explosive is greater than the cryolite content in the second layer of explosive. Further improving the allowable safety requirement of underground coal mine.

Preferably, a protective sleeve is formed on the outer periphery of the ignition structure. The lag can form the protection to the ignition structure, improves the ignition reliability to ensure the security of detonator in the transportation.

Preferably, the protective sleeve is made of heat shrink tube, silica gel sleeve or steel pipe cap; or, the plastic injection molding is carried out. To form a variety of alternative configurations to select based on a particular use environment and production cost control scheme. When a heat shrink tube, a silica gel sleeve or an injection plastic package structure is adopted, the protective sleeve only surrounds the periphery of the ignition structure, and an ignition hole is formed at the free end of the ignition structure. When the steel pipe cap is adopted, an ignition hole is reserved on the steel pipe cap, the steel pipe cap is preferably tightly matched with an inner hole of a pipe shell of the basic detonator so as to improve the vibration resistance and the shock resistance of the ignition structure and the chip module, and the steel pipe cap is preferably subjected to the same surface protection treatment as the steel pipe shell.

In order to achieve the second objective, the present invention adopts the following technical solutions.

An electronic detonator initiation system is used for initiating a first purpose and is suitable for an underground coal mine allowable electronic detonator, and comprises an initiator with a delay time setting unit; and the plurality of allowable electronic detonators suitable for underground coal mines are connected with the exploder through leg wires.

The initiation system adopting the scheme is used for initiating the first purpose and is suitable for the allowable electronic detonator in the underground coal mine, and the leg wire of the electronic detonator is connected with the initiator through a bus or other connecting wires or directly so as to realize networking of the electronic detonator. The delay time is optionally set by the underground coal mine allowed electronic detonator and the detonator, respectively, to be suitable for the case where the delay time is preset or not preset at the time of detonator production. The two electronic detonators can realize detonation control of corresponding delayed detonation through the detonator, and the control mode is flexible.

The utility model has the advantages that the electronic detonator is provided with the intrinsic safety type electronic control circuit, the obtaining time of the delay time is shortened, the delay precision is also improved, the controllability of the detonation moment is ensured, and the safety guarantee is provided for the allowable detonator of underground coal; the detonation system is suitable for the electronic detonator with preset delay time and the electronic detonator without preset delay time.

Drawings

Fig. 1 is a schematic structural diagram of the middle electronic detonator of the present invention.

Fig. 2 is a schematic view of a part of the structure of the electronic detonator of the present invention.

Fig. 1 and 2 are also used for explaining the detonation system of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, which are not intended to limit the scope of the embodiments described herein.

Example 1, referring to fig. 1 and 2, a permissible electronic detonator for a downhole coal mine comprises an electronic ignition element and a base detonator 1; the electronic ignition element consists of a pin wire 2, a chip module 3 and an ignition structure 4, wherein the chip module 3 is an electronic control circuit; the chip module 3 is an intrinsic safety type electronic control circuit, the chip module 3 is provided with a first input electrode 3a and a second input electrode 3b, and a safety protection diode is respectively arranged between two input end electrodes of the chip module 3 and the electronic circuit of the chip module 3; and the chip module 3 has a delay setting unit capable of setting a plurality of delay time periods, and the maximum delay time is less than 130 ms.

Wherein, one end of the leg wire 2 is provided with an injection molding plug 8, the leg wire 2 is tightly matched and fixed on the basic detonator 1 through the injection molding plug 8 and a tube hole at the free end of the tube shell of the basic detonator 1, and two core wires of the leg wire 2 are respectively connected with two electrodes at the input end of the chip module 3; the other end of the leg wire 2 is provided with a line card 9 for networking. The lead of the leg wire 2 is a double-strand composite lead, the wire cores are formed by drawing a tinned copper-clad steel core wire, a layer of inner-layer insulating material is wrapped on a single wire core, and the two wire cores are compounded into a whole through the outer-layer insulating material.

The basic detonator 1 comprises a steel tube shell 10, the steel shell 10 is subjected to bluing or copper plating treatment, the chip module 3 forms a packaging layer through injection molding and packaging, and a conductive spring piece is arranged between the packaging layer and the steel tube shell 10. The outside cover of ignition structure 4 has lag 11, and lag 11 adopts steel material to make and through bluing or copper facing processing, and is equipped with ignition hole 11a on lag 11, and lag 11 and the pipe shell hole tight fit of basic detonator 1. The ignition structure 4 is composed of a patch type bridge wire and a patch type resistor and is connected with the output end of the chip module 3 in an SMT mode; the protective sleeve 11 is covered after the ignition structure 4 is dipped with the medicine. The basic detonator has a three-layer explosive loading structure, wherein a first layer of explosive 5 and a second layer of explosive 6 are graphite granulation hexogen explosives containing flame suppressants, the content of the flame suppressants in the second layer of explosive 6 is larger than that of the first layer of explosive 5, the content of cryolite in the first layer of explosive 5 accounts for 15-16% and the content of cryolite in the second layer of explosive 6 accounts for 8.5-9.5% in percentage by weight; the third layer of explosive 7 is a detonating explosive consisting of nickel hydrazine nitrate; the flame suppressor is composed of cryolite. Wherein, the outside cover of third layer explosive 7 distal end is equipped with explosive protection cap 12, explosive protection cap 12 sets up ignition hole 12a, ignition hole 12a and ignition hole 11a set up in opposite directions to the flame or the flame that flees from ignition hole 11a of lag 11, or, the spark or the spark of jumping out, ignite the initiating explosive through ignition hole 12a, explosive protection cap 12 and the shell hole tight fit of basic detonator 1, explosive protection cap 12 adopts steel material to make and through bluing or copper facing processing. The blueing or copper plating treatment modes of the shell of the basic detonator 1, the protective sleeve 11 and the explosive protective pipe cap 12 are the same, namely when the basic detonator 1 is blued, the protective sleeve 11 and the explosive protective pipe cap 12 are also blued; when the basic detonator 1 is plated with copper, the protective sleeve 11 and the explosive protective pipe cap 12 are also plated with copper.

In this embodiment, the chip module 3 has a delay setting unit having 5 delay time periods for selection, including 0ms, 25ms, 50ms, 75ms, and 100ms, so that the detonators are respectively cured according to delay blasting times of 0ms, 25ms, 50ms, 75ms, and 100ms when the product is shipped. The 0ms delay time is the default delay time, and no additional operation is needed.

In this embodiment, the ignition structure 4 may also be formed by a patch type energetic material or a semiconductor bridge, so as to replace a scheme in which a patch type bridge wire or a patch type resistor forms the ignition structure 4, and in the case of using the patch type energetic material or the semiconductor bridge, the ignition structure 4 does not need to be stained with a chemical.

In this embodiment, the protective sleeve 11 may also be made of a heat shrink tube, a silica gel sleeve, a steel cap, or the like, or may be formed by plastic injection; when adopting pyrocondensation pipe, silica gel cover or injecting glue plastic envelope structure, the lag only surrounds at ignition structure 4 periphery, forms an ignition hole at ignition structure 4's free end.

Embodiment 2, with reference to fig. 1 and 2, an electronic detonator initiation system for initiating an allowable electronic detonator for a downhole coal mine of embodiment 1, comprising an initiator having a delay time setting unit; a plurality of allowable electronic detonators suitable for underground coal mines are connected with the detonator through the leg wires 2 through bus bars or other conducting wires or directly.

Wherein, the allowable electronic detonator suitable for the underground coal mine can be preset to be a delay time of 25ms, 50ms, 75ms or 100 ms. And when blasting networking is performed, the delay blasting time of a corresponding detonator can be set on the detonator according to the blasting design.

The rest of the structure of this embodiment is the same as embodiment 1, and is not described herein again.

For a better understanding of the solution of the invention, the method of operation of the initiation system of example 2 in the specific application is further described below.

An electronic detonator initiation method implemented based on the initiation system of embodiment 2 is applicable to pre-curing the allowable electronic detonator applicable to the underground coal mine with delay time of embodiment 1, and comprises the following specific steps:

s1, when in production, presetting delay time on the electronic detonator, configuring the leg wire with corresponding color according to the preset time, and marking by using a label on the leg wire;

s2, when charging the blast hole, putting the electronic detonator preset with delay time into the corresponding blast hole along with the explosive according to the blasting design scheme;

s3, after the blast hole is blocked, networking is carried out by using a leg wire, after networking, the information of the electronic detonator is detected and read on line at the initiation point through the detonator, and after the detection result is normal, charging and initiating are carried out.

In the present method, the delay time has 4 alternative times, 25ms, 50ms, 75ms and 100ms respectively.

An electronic detonator initiation method implemented based on the initiation system of embodiment 2 is applicable to the allowable electronic detonator applicable to underground coal mines of embodiment 1 without delay time solidification in advance, and comprises the following specific steps:

s1, during production, the electronic detonator only indicates the detonator identity information by the label on the leg wire, and the electronic detonator adopts the default 0ms delay time;

s2, when charging the blast hole, randomly putting the electronic detonator into the blast hole along with the explosive;

s3, setting delay time of each blast hole on the detonator according to the blasting design scheme after the blast holes are blocked;

s4, scanning the label by the initiator in a non-contact manner to obtain detonator identity information, registering codes and forming one-to-one correspondence of blast holes, time and detonator identities;

and S5, after the blast hole is blocked, networking by using a leg wire, after networking, carrying out networking detection at a detonation point by using an initiator, and after a detection result is normal, charging and detonating.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims (7)

1. A allowable electronic detonator applicable to underground coal mines comprises an electronic ignition element and a basic detonator (1); the electronic ignition element consists of a pin wire (2), a chip module (3) and an ignition structure (4); the circuit is characterized in that the chip module (3) adopts an intrinsic safety type electronic control circuit, and a safety protection diode is respectively arranged between two input end electrodes of the chip module (3) and an electronic circuit of the chip module (3); and the chip module (3) is provided with a delay setting unit which can set a plurality of delay times which are all less than 130 ms.

2. The allowable electronic detonator for downhole coal mines according to claim 1, wherein the base detonator (1) comprises a steel shell (10); the chip module (3) is packaged through injection molding, and a conductive spring piece is arranged between the packaging layer and the steel tube shell (10).

3. The allowable electronic detonator for underground coal mines according to claim 1, wherein the ignition structure (4) is composed of a patch type bridge wire, a patch type resistor, a patch type energetic material or a semiconductor bridge and is connected with the output end of the chip module (3) in an SMT manner.

4. The allowable electronic detonator for underground coal mines according to any one of claims 1 to 3, wherein a protective sleeve is formed around the outer periphery of the ignition structure (4).

5. The allowable electronic detonator for underground coal mines as claimed in claim 4, wherein the protective sleeve is composed of a heat-shrinkable tube, a silica gel sleeve or a steel cap; or, the plastic injection molding is carried out.

6. The allowable electronic detonator for underground coal mines according to any one of claims 1 to 3, wherein the delay time has 5 alternative times, in particular values of 0ms, 25ms, 50ms, 75ms and 100 ms.

7. An electronic detonator initiation system, which is used for initiating the allowable electronic detonator applicable to underground coal mines in any one of claims 1 to 6, and comprises an initiator with a delay time setting unit; and a plurality of allowable electronic detonators suitable for underground coal mines are connected with the detonator through foot lines (2).

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