A handheld energy-gathering cutter for underwater use

Abstract

The present invention belongs to the field of blasting technology, and particularly relates to a handheld underwater energy-gathering cutter, comprising a first shell, a second shell, a charge liner, an initiation control assembly and an electric detonator initiation circuit; the first shell and the second shell are sequentially arranged above the charge liner, a polymer composite material is arranged in the space formed by the first shell and the second shell, explosives are filled in the space formed by the second shell and the charge liner, a detonator chamber is arranged at the center of the upper end of the first shell, an electric detonator is placed in the detonator chamber, the detonator chamber is connected to the first shell and the second shell, a handle is arranged above the first shell, the bottom of the handle is connected to the detonator chamber, an electric detonator initiation circuit is arranged in the handle, and a water pressure switch and a manual switch are connected in series in the electric detonator initiation circuit. The explosion fragments of the present invention will not jump out, the shock wave is greatly weakened, the underwater operation safety of divers can be met, and the market prospect is good.

Description

Technical Field

[0001] The invention belongs to the technical field of blasting, and in particular relates to a handheld energy-focusing cutter for underwater use. Background Art

[0002] When cutting cables, shaped charge technology is used. When the explosives explode, a high-speed jet is generated to cut the cables. When underwater divers cut underwater cables and optical cables, the large shock waves and countless fragments caused by the explosion pose a great safety threat to the operators, so there is an urgent need to improve the underwater cutting technology. Summary of the invention

[0003] In view of the above deficiencies in the prior art, the present invention provides a handheld energy-concentrating cutter for underwater use, which can greatly improve the safety factor of underwater cutting operators when cutting cables through structural improvements.

[0004] The technical solution adopted by the present invention to solve the technical problem is: an underwater handheld energy-gathering cutter for cutting underwater ropes. The cutter adopts a small-charge energy-gathering structure and uses polymer materials to absorb shock waves and fragments, thereby ensuring the cutting effect and the safety of divers.

[0005] The present invention comprises a first shell, a second shell, a charge liner, an initiation control assembly and an electric detonator initiation circuit; the charge liner has a longitudinal section of an inverted "V"-shaped structure, the first shell is arranged outside the upper part of the charge liner, the second shell is arranged below the first shell and above the charge liner, the lower ends on the left and right sides of the first shell and the lower ends on the left and right sides of the second shell are fixedly connected to the corresponding side ends of the charge liner; the first shell and the second shell are both made of high-strength steel, a polymer composite material is arranged in the space formed by the first shell and the second shell, the space formed by the second shell and the charge liner is filled with explosives, a detonator chamber is arranged in the center of the upper end of the first shell, and the detonator chamber is arranged in the lower part of the detonator chamber. The tube chamber extends from the first shell to the second shell, and electric detonators are placed in the detonator chamber. The cavity between the second shell and the outer side of the upper end of the charge cap forms the explosion height of the explosive. A handle is arranged above the first shell, and the handle is a tubular structure. The bottom of the handle is connected to the detonator chamber. An electric detonator ignition circuit is arranged in the handle. A water pressure switch, a manual switch, an electric detonator and a battery are connected in series in the electric detonator ignition circuit. The water pressure switch is 10cm~50cm away from the first shell. The water pressure switch is used to ensure the position of the ignition point in the water. Only when the water pressure switch and the manual switch are turned on together, the electric detonator ignition circuit will be connected. The battery provides power for the electric detonator ignition circuit.

[0006] The explosive is wrapped with a metal shell and a polymer composite material to block the fragments of the explosive shell and attenuate the shock wave of the explosive. The function of the water pressure switch is to use the existence of water pressure to sense the water depth and avoid the malfunction of the detonation component on the shore. The switch will only be turned on when the water depth reaches the set level.

[0007] The manual switch is the detonation button for the diver to detonate the cutter underwater. A push switch with a waterproof sealing structure can be selected.

[0008] Furthermore, the electric detonator ignition circuit also includes a mechanical switch for insurance, and the mechanical switch is connected in series in the electric detonator ignition circuit through a wire. When the mechanical switch, the water pressure switch and the manual switch are turned on together, the circuit will be turned on, and the mechanical switch is used to ensure the safety of the entire device during transportation.

[0009] Furthermore, the material of the medicine liner is copper.

[0010] Furthermore, the inverted "V"-shaped top opening angle of the medicine cover is 60 degrees to 90 degrees, and the medicine cover is a long strip.

[0011] Furthermore, the thickness of the first shell is 0.3 cm to 0.5 cm, the diameter is 3 cm, and the length is 5 cm; the thickness of the second shell is 0.2 cm to 0.4 cm, the diameter is 13 cm, and the length is 5 cm.

[0012] Furthermore, the explosive is plastic explosive, the charge length is the same as the length of the charge liner, and the charge amount is 18g~20g.

[0013] Furthermore, the liner wall thickness of the liner is 0.2 cm, and the liner busbar length of the liner is 3 cm.

[0014] Furthermore, the polymer composite material is metal foam aluminum.

[0015] Furthermore, a hole A is provided at the center of the top of the first shell, a hole B is provided at the center of the top of the second shell, the detonator chamber is arranged through hole A and hole B, the bottom of the handle is sealed and fixedly connected to the periphery of hole A of the first shell, and the bottom of the handle is communicated with the detonator chamber.

[0016] Furthermore, the handle is a metal tube.

[0017] The present invention has the following beneficial effects: the energy-focused cutter of the present invention coats the explosives through the first shell, the second shell double-layer metal shell and the polymer composite material arranged between the double metal shells, adopts a small charge design, and uses the polymer material to absorb shock waves and fragments, thereby ensuring the cutting effect and the safety of the diver; and a water pressure switch is provided to control the depth of the cutter underwater. Only when the set depth is reached can the electric detonator ignition circuit be turned on, thereby further ensuring the safety of the diver. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a longitudinal sectional front view schematic diagram of an embodiment provided by the present invention;

[0019] Figure 2 It is a schematic diagram of the detonation circuit diagram of the electric detonator provided in the embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of the structure of a mechanical switch in an embodiment provided by the present invention;

[0021] In the figure: 1, first shell 11, polymer composite material 12, electric detonator 2, second shell 21, explosive 3, charge cap 4, handle 51, water pressure switch 52, manual switch 53, mechanical switch 54, battery 55, wire 551, contact 56, safety pin 57, metal sheet 58, spring. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings.

[0023] Embodiment 1:

[0024] like Figure 1~Figure 3 As shown, the underwater handheld energy-gathering cutter described in the present invention comprises a first shell 1, a second shell 2, a charge liner 3, an ignition control assembly 4 and an electric detonator ignition circuit; the longitudinal section of the charge liner 3 is an inverted "V"-shaped structure, the first shell 1 is arranged outside the upper part of the charge liner 3, and can be an arc-shaped structure with an opening downward, the second shell 2 is arranged below the first shell 1 and above the charge liner 3, the lower ends on the left and right sides of the first shell 1 and the lower ends on the left and right sides of the second shell 2 are fixedly connected to the corresponding side ends of the charge liner 3, the second shell 2 can be an arc-shaped structure with an opening downward, the first shell 1 and the second shell 2 are both made of high-strength steel, and a polymer composite material 11 with a thickness of 10 cm is arranged in the space formed by the first shell 1 and the second shell 2 for attenuating shock waves and blocking fragments;

[0025] Both ends of the first shell 1 and the second shell 2 are sealed, the second shell 2 is spaced apart from the outer side of the upper end of the charge liner 3, the space formed by the second shell 2 and the charge liner 3 is filled with explosive 21, a hole A is provided at the center of the top of the first shell 1, a hole B is provided at the center of the top of the second shell 2, a detonator chamber is provided at the center of the upper end of the first shell 1, the detonator chamber extends from the hole A to the hole B, an electric detonator 12 is placed in the detonator chamber, the cavity between the second shell 2 and the outer side of the upper end of the charge liner 3 forms the blasting height of the explosive 21, a handle 4 is provided above the first shell 1, the handle 4 is a metal tube, and a pressure-resistant metal tube can be used, and the bottom of the handle 4 is sealed and fixedly connected to the periphery of the hole A of the first shell 1;

[0026] The handle 4 is provided with an electric detonator ignition circuit, which is a water pressure switch 51, a manual switch 52, an electric detonator 12 and a battery 54 connected in series, and the water pressure switch 51 is 10 cm to 50 cm away from the first housing 1. The water pressure switch 51 is used to ensure that the detonation point is deep enough in the water, and safety is guaranteed by a certain water pressure. Only when a certain safety water pressure is reached, the water pressure switch 51 will be opened to connect the circuit where the water pressure switch 51 is located. The manual switch 52 is used to manually detonate the electric detonator ignition circuit. Only when the water pressure switch 51 and the manual switch 52 are connected together, the electric detonator ignition circuit will be connected, and the battery 54 provides power for the electric detonator ignition circuit.

[0027] The explosive 21 is wrapped with a metal shell and a polymer composite material to block the fragments of the explosive shell and attenuate the shock wave of the explosive. The function of the water pressure switch 51 is to use the existence of water pressure to sense the water depth and avoid the malfunction of the detonation component on the shore.

[0028] The water pressure switch 51 can adopt the authorized patent "A water pressure assembly switch with manual control and its communication buoy automatic release device" invented by the inventor (publication number: CN208507573U). The water pressure membrane is mostly made of rubber material. Its basic functions are to seal and isolate the external seawater from the cavity; secondly, to convert the uniform pressure of the external sea (fresh) water into a concentrated force, which acts on the water pressure spring through the water pressure plate to deform the water pressure spring. The deformation of the spring is used to connect the detonation circuit and put the detonation circuit in a ready state. This switch does not need a watertight structure and can also be other water pressure switches that can achieve the above functions.

[0029] Manual switch 52 is the detonation button of the diver's underwater detonation cutter. A push switch with a waterproof sealing structure can be selected, such as the Thai Airways marine waterproof conversion switch HF3-1B.

[0030] Furthermore, the detonator ignition circuit also includes a mechanical switch 53 that serves as a safety device. The mechanical switch 53 is connected in series to the detonator ignition circuit via a wire 55. The mechanical switch 53 is used for normal storage and transportation and is released before entering the water for underwater operations. The mechanical switch 53 adopts a commonly used latch safety structure. Figure 3 As shown, after the safety pin 56 is pulled out, the metal sheet 57 moves upward under the elastic force of the spring 58 and connects with the two contacts 551 of the wire 55, thereby releasing the safety and connecting the wire 55.

[0031] Furthermore, the material of the medicine liner 3 is copper.

[0032] Furthermore, the inverted "V"-shaped top opening angle of the medicine liner 3 is 60°, and the medicine liner is a long strip. The medicine liner generatrix length of the medicine liner 3 is 3 cm.

[0033] Furthermore, the first shell 1 has a thickness of 0.3 cm, a diameter of 3 cm, and a length of 5 cm, and the second shell 2 has a thickness of 0.2 cm, a diameter of 13 cm, and a length of 5 cm.

[0034] Furthermore, the explosive 21 is plastic explosive, the length of the charge is the same as the length of the liner 3, the charge amount is 19g, the length of the charge is equal to the length of the liner, and the detonation method is center point detonation.

[0035] Furthermore, the liner wall thickness of the liner 3 is 0.2 cm.

[0036] Furthermore, the liner busbar length of the liner 3 is 3 cm.

[0037] Furthermore, the polymer composite material 11 is metal foam aluminum, and its impact resistance and shock wave absorption performance both meet safety requirements. The entire device has close to zero buoyancy underwater.

[0038] The technical parameters of this embodiment are:

[0039] (1) The maximum effective cutting wire rope diameter is not less than 3 cm;

[0040] (2) Maximum operating water depth: not less than 30m;

[0041] (3) At 50 cm from the detonation point of the charge, the shock wave pressure is less than 300 kPa.

[0042] It can be seen from the above parameters that when the energy-gathering cutter of this embodiment is used at a water depth greater than 30m, because there are a first shell and a second shell and a polymer composite material 11 is arranged between the two, a smaller shock wave can be ensured, and the fragments during the explosion are minimized; at the same time, the diameter of the cut steel cable is larger, and it can be seen that the cutting effect is good, because the double insurance measures of the water pressure switch 51 and the mechanical switch 53 ensure the safety of the diver's underwater operation. When the present invention is used for cable cutting, the fragments will not jump out, the shock wave is greatly weakened, and the safety of the diver's underwater operation can be met, and it has a good market prospect.

[0043] The above descriptions are embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A handheld underwater energy-concentrating cutter, characterized in that: The invention comprises a first shell, a second shell, a charge liner, an initiation control assembly and an electric detonator initiation circuit; the longitudinal section of the charge liner is an inverted "V"-shaped structure, the first shell is arranged on the upper outside of the charge liner, the second shell is arranged below the first shell and above the charge liner, the lower ends on the left and right sides of the first shell and the lower ends on the left and right sides of the second shell are fixedly connected to the corresponding side ends of the charge liner; the first shell and the second shell are both made of high-strength steel, a polymer composite material is arranged in the space formed by the first shell and the second shell, the second shell and the charge liner are fixedly connected to each other. The formed space is filled with explosives, a detonator chamber is provided at the center of the upper end of the first shell, the detonator chamber extends from the first shell into the second shell, an electric detonator is placed in the detonator chamber, the cavity between the second shell and the outer side of the upper end of the charge liner forms the explosion height of the explosive, a handle is provided above the first shell, the handle is a tubular structure, the bottom of the handle is connected to the detonator chamber, an electric detonator ignition circuit is provided in the handle, a water pressure switch, a manual switch, an electric detonator and a battery are connected in series in the electric detonator ignition circuit, and the battery provides power for the electric detonator ignition circuit; The electric detonator blasting circuit also includes a mechanical switch that serves as a safety device, and the mechanical switch is connected in series in the electric detonator blasting circuit through a wire; the inverted "V"-shaped top opening angle of the charge liner is 60 degrees to 90 degrees, and the charge liner is a long strip.

2. The underwater handheld energy-concentrating cutter according to claim 1, characterized in that: The material of the medicine liner is copper.

3. The underwater handheld energy-concentrating cutter according to claim 1, characterized in that: The thickness of the first shell is 0.3 cm to 0.5 cm, and the thickness of the second shell is 0.2 cm to 0.4 cm.

4. The underwater handheld energy-concentrating cutter according to claim 1, characterized in that: The explosive is plastic explosive, and the charge length is the same as the length of the charge liner.

5. The underwater handheld energy-focusing cutter according to claim 1, characterized in that: The wall thickness of the medicine liner is 0.2 cm, and the length of the medicine liner busbar is 3 cm.

6. The underwater handheld energy-focusing cutter according to claim 1, characterized in that: The high polymer composite material is metal foam aluminum.

7. The underwater handheld energy-focusing cutter according to claim 1, characterized in that: A hole A is provided at the center of the top of the first shell, a hole B is provided at the center of the top of the second shell, the detonator chamber is arranged through holes A and B, the bottom of the handle is sealed and fixedly connected to the periphery of hole A of the first shell, and the bottom of the handle is connected to the detonator chamber.

8. The underwater handheld energy-focusing cutter according to claim 1, characterized in that: The handle is made of metal.

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