Electric detonating system

FIELD: electricity.

SUBSTANCE: electric detonating system comprises circuits of electric detonators, each of them consisting of two in series electric detonators and distinguished by the fact that each electric detonator includes external electrode and internal electrode, at that in each circuit of electric detonators their inner electrodes are interconnected and insulated while external electrodes of the first electric detonators in each circuit are jointed and form the first input for connection to power supply source, external electrodes of the second electric detonators in each circuit are jointed and form the second input for connection to power supply source, at that the first and second outputs for connection to power supply source are shunted.

EFFECT: improving safety of use.

3 cl, 2 dwg

 

The invention relates to the field of blasting, in particular to electrical devices designed for simultaneous initiation of several explosive substance or multiple points in a single charge.

Most similar in essential characteristics is a parallel-serial electrical explosive network (centuries Matveichuk, B. N., Churilov, Blasting: a Training manual. - Moscow: Academic project, 2002. - 384 C.) containing parallel connected to the power supply chain of series-connected electric detonators.

The disadvantage of this device is the lack of protection from accidental contact with electricity from the outside to the electrodes of electric detonators during the period of preparation for the explosion, if the network is grounded intentionally or accidentally (Gruevski M. M. Handbook of electrical blasting explosive charge. Ed. 2nd, Rev. and ext. M: Rendezvous-AM - 2000. - 448 C.). Protective isolation of both electrodes of the detonators is not always possible within a fairly short period of time. It is not excluded accidental electricity to any of the electrodes of electric detonators so that electric current will flow in parallel electric detonators of the same chain. If the chain two detonator, the current will be distributed between n the mi spread around evenly and the amount of current, flowing through each detonator chain will be approximately half of the current supply. At a certain threshold current values can occur premature explosion of both electric detonators and the explosion of the charges (charge).

A known electric detonators or explosives coaxial configuration, with internal and external electrodes (patent RF №2104467; IPC F42B 3/12, publ. in bull. No. 4 from 10.02.1998,, RF patent №2179699; IPC F42B 3/12, F42C 19/12, publ. in bull. №5 dated 20.02.2002 year). The external electrode is simultaneously the capacity for explosives, so they detonators have smaller dimensions and high manufacturability.

The task, which is aimed by the invention, consists in the development of technical measures to reduce the risk and protect electrical explosive network with two installed electric detonators coaxial configuration in each of the parallel chains from a premature explosion of electric detonators accidental release electricity from outside on any of the open current carrying parts of the network, for example, to open the electrode of any of the detonator, if the network is intentionally or accidentally grounded.

The technical result is to increase the safe use of electrical explosive network.

This technology is static result is achieved by in electric blast network containing chain electric detonators, each of which consists of two series-connected electric detonators, what's new is that each detonator includes external and internal electrodes, each chain electric detonators their internal electrodes are interconnected and isolated, and the external electrodes of the first electric detonators each chain are combined and the first output for connection to a power source, the external electrodes of the second electric detonators each chain are combined and a second output for connection to a power source, and first and second leads for connection to a power source shunted by.

To isolate the detonator can be applied cartridge comprising a conductive casing and the inner electrode, while the conductive Chuck body is electrically connected with the external electrode of the electric detonator, and the internal electrode with the inner electrode of the electric detonator.

Connection and external isolation of the internal electrodes of electric detonators each chain allows you to provide multiple decrease the amount of current flowing through the electric detonators chain accidental release electricity at one of the open electrodes of the network, significantly reducing ve is aatest premature explosion of electric detonators and charges (charge), which leads to safer use.

Repeated reduction in the magnitude of the current is due to the fact that a large part of electricity, accidentally falling on open leads for connection of the power source or the exposed electrodes of the electric detonators, flows to the ground through a shunt area of the conductor chain, parallel plot with electric detonators. This is because the ratio of the values of the currents flowing through the section of chain with electric detonators and parallel shunt portion of the chain is inversely proportional to the ratio of the electrical resistances of the circuit of these sites. The greater the resistance of the section of chain with electric detonators compared with the resistance of the shunt plot in it, the less current will flow through the electric detonators. Usually the resistance of electric detonators higher resistance supply conductors. Therefore, the resistance of the plot with electric detonators will be several times higher than the resistance of the shunt site. Thus, significantly increases the permissible value of the random current flowing from the outside of the chain of the electric detonators, not causing an explosion. Electric blast network is more secure to use.

The electrical connection of the conductive body and the outer electrode is electrocatheter carry out pin locking device which additionally blocks the detonator in the cartridge to prevent access to the inner electrode of the electric detonator.

The use of electric detonators coaxial configuration, i.e. including external and internal electrodes, is not new in itself, but in combination with other essential features is new and allows to achieve the stated technical result.

In Fig.1 shows an embodiment of the circuit of explosive network of Fig.2 is a diagram of the design of the cartridge with a detonator and pin locking device.

Electric blast network (Fig.1) contains three parallel chains of electric detonators. All chain electric detonators are made identical.

Each chain electric detonators (Fig.1) contains the first 1 and second 2 electric detonators, insulators 3, 4, the conductors 5, 6, 7.

The first 1 and second 2 electric detonators contain explosive 8, 9, the external electrodes 10, 11 and the internal electrodes 12, 13.

The internal electrodes 12, 13 electric detonators 1, 2 are connected by a conductor 5 and closed by the insulators 3, 4. External electrodes 10 of the first electric detonators 1 of each chain are connected with the conductors 6 and are the first 14 output for connection to a power source (shown in Fig.1 is not shown). The external electrodes 11 of the second electrodein the tori 2 of each chain are connected with the conductors 7 and are 15 second output for connection to a power source (shown in Fig.1 is not shown). The first 14 and second 15 conclusions bridged between a shunt 16 until the connection with the power source and bringing electric blast network is ready to explode.

The second conclusion 15 the grounded conductor 17. All conductors are made isolated.

Possible options random electricity shows zigzag arrows 18, 19 and 20.

As insulators 3, 4 is used cartridges (Fig.2), each of which contains a conductive housing 21, the inner electrode 22, an insulating sleeve 23, the contact locking mechanism 24.

Pin locking device 24 is made in the form of a collet electrode and mounted in the conductive housing 21. Elastic lamellae collet electrode 24 in contact with the external electrode is installed in the Chuck of the electric detonator 25 and abuts the structural element 26 made on the outer surface of the detonator in the form of grooves, groove (grooves) or protrusions (protrusions). This prevents the removal of a detonator of the cartridge. The connection of the cartridge with other network elements is carried out by conductors 27.

Electric blast network works as follows.

For the period prior to connection to the power source (Fig.1 not shown) and bringing electric blast network is ready to explode findings 15 and 16 connected to the I power source is bridged between a shunt 16. Therefore, in case of accidental contact with electricity, 18, 19, 20 from the outside on one of the outdoor live parts of electrical explosive network, for example, to the conclusions of 15 and 16, or to the electrodes 10 or 11 one of the electric detonators 1, 2 one of the chains, a large part of the electricity will flow through the conductor 17 to the ground bypassing the electric detonators.

After you install the cartridge (Fig.2) the detonator 25 protection of the internal electrode of the electric detonator and the internal electrode 22 of the cartridge from access and the occasional electricity guaranteed locked in locking collet electrode 24.

To protect other live parts of electrical explosive network from accidental contact with electricity from the outside also apply locking device. For example, the electrodes 10 and 11 with the shunt 16 can be placed in the connector (USSR author's certificate No. 938342; IPC H01R 17/00, publ. in bull. No. 23 of 23.06.1982,), whose input is protected by a flap locking type.

1. Electric blast network containing chain electric detonators, each of which consists of two series-connected electric detonators, characterized in that each electric detonator includes external and internal electrodes, each chain electric detonators their internal electrodes are interconnected and isolated, and the external electrodes of the first electrode is of Natarov each chain are combined and the first output for connection to a power source, external electrodes of the second electric detonators each chain are combined and a second output for connection to a power source, and first and second leads for connection to a power source shunted by.

2. Electric blast network p. 1, wherein each detonator has additionally introduced in the cartridge comprising a conductive casing and the inner electrode, while the conductive Chuck body is electrically connected with the external electrode of the electric detonator, and the internal electrode with the inner electrode of the electric detonator.

3. Electric blast network p. 2, characterized in that the conductive Chuck body contains contact locking mechanism.



 

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