Equipment for accurately controlling combustion damage in large area

Abstract

The invention discloses large-area accurate control combustion damage equipment, which comprises a pipeline provided with three cavity pipelines which are respectively used for installing a propelling device, a combustion agent and a fan; the propelling device is used for propelling the combustion agent to the cavity pipeline on the fan side in a power-on state; the fan is used for blowing the combustion agent to the telescopic spray pipe in a power-on state; the telescopic spray pipe is arranged at the bottom of the pipeline, is used for extending to the target cavity and can pull the circuit switch to be closed through the connecting wire; the electric ignition head is arranged at the bottom of the telescopic spray pipe and is used for igniting the combustion agent in a power-on state; the limiting mechanism is used for limiting the position of the telescopic spray pipe to enable the telescopic spray pipe to be in a contraction state in a normal state; the circuit switch is used as a power-on switch of the power supply, the propelling device, the fan and the delay circuit; and the time delay circuit is used for starting the electric ignition head in a time delay manner after the telescopic spray pipe and the fan work. The device can achieve the effects that the damage area is large, the damage effect is controllable, and the damage is not prone to recovery.

Description

Technical Field

[0001] The present invention belongs to the field of demolition equipment, in particular to a large-area precisely controlled burning and damage equipment, which is mainly used for internal damage to oil and gas pipelines, material warehouses, vehicles, etc. Background Art

[0002] In modern society, demolition and incendiary equipment plays a significant role. In the military, the use of demolition and incendiary weapons can effectively penetrate enemy obstacles and fortifications. Possessing demolition and incendiary equipment enables reconnaissance of enemy rear waters and areas, large-scale precision damage strikes against key locations such as mobile launch systems, air defense facilities, water conservancy projects, and command posts, and other special combat missions. In civilian applications, urban construction and renewal require the demolition of large numbers of old buildings. Demolition and incendiary equipment can speed up demolition and improve work efficiency. In the processing of building materials, demolition and incendiary equipment can be used for cutting and shaping raw materials. For example, plasma cutting equipment can be used to cut metal sheets to obtain shapes and sizes that meet building design requirements. Furthermore, through the demolition and recycling of waste building materials, such as flame cutting of scrap steel, waste steel can be recycled, saving resources.

[0003] Civilian incendiary demolition equipment typically includes the following: A flame spray gun uses a mixture of combustible gas and air, ignited through a spray gun, to produce a high-temperature flame. Use of a flame spray gun requires good ventilation to prevent the accumulation of combustible gas. Furthermore, the area of use must be clear of any accumulation of flammable or explosive materials, placing high demands on the cleanliness and safety of the space. A gasoline-powered cutting saw generates power by burning gasoline, driving the saw blade to rotate at high speeds and cut the material. However, the startup procedure is cumbersome, and gasoline must be carried as fuel, which increases the inconvenience and danger of carrying it. Furthermore, the saw blade rotates at high speeds, and operators can easily be cut by the blade if they make mistakes or are not paying attention.

[0004] None of the above-mentioned means of destruction can meet the requirements of precise control of demolition equipment and efficient internal destruction. Summary of the Invention

[0005] The purpose of the present invention is to provide a large-area precise control burning damage equipment, so as to achieve the effects of large damage area, controllable damage effect and difficult recovery of damage.

[0006] The technical solutions for achieving the purpose of the present invention are:

[0007] A large-area, precisely controlled burning and damage device, comprising:

[0008] The pipeline is provided with three cavity pipelines for installing the propulsion device, the combustion agent and the fan respectively;

[0009] A propulsion device is used to propel the combustion agent toward the cavity pipe on the fan side when powered;

[0010] The fan is used to blow the combustion agent into the telescopic nozzle when the power is on;

[0011] A telescopic nozzle is provided at the bottom of the pipe, is used to extend to the target cavity, and can pull the circuit switch to close through the connecting wire;

[0012] The electric ignition head is arranged at the bottom of the telescopic nozzle and is used to ignite the fuel when the power is on;

[0013] A limiting mechanism is used to limit the position of the telescopic nozzle so that the telescopic nozzle is in a retracted state under normal circumstances;

[0014] Circuit switch module, serving as the power switch for the power supply, propulsion device, fan and delay circuit;

[0015] The delay circuit is used to delay the start of the electric ignition head after the telescopic nozzle and fan are working.

[0016] Compared with the prior art, the present invention has the following significant advantages:

[0017] (1) By controlling the telescopic nozzle in the propulsion structure, efficient damage to the interior of the target can be achieved.

[0018] (2) By controlling the diffusion angle of the telescopic nozzle in the propulsion structure and the wind speed of the centrifugal fan in the spreading structure, it is possible to achieve high-efficiency damage such as a large damage area and controllable damage effect.

[0019] (3) By coupling the propulsion structure, the dispersal structure, the combustion structure and other structures, the miniaturization and efficiency of the destruction equipment can be achieved, and the mobility of the users can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a cross-sectional view of the damaged equipment.

[0021] Figure 2 This is the front view of the damaged equipment.

[0022] Figure 3 This is the overall circuit diagram.

[0023] Figure 4 This is the delay circuit diagram. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] The present invention provides a large-area precision-controlled combustion and destruction equipment structure that is divided into four parts, including a cavity pipe, a propulsion structure, a spreading structure, and a combustion structure. The overall structure of this equipment is cylindrical, and the overall cavity pipe is divided into three parts by the propulsion structure and the spreading structure. The propulsion structure is located at the top of the equipment and is connected to the spreading structure. The spreading structure is located in the middle of the equipment, connecting the propulsion structure at the top and the combustion structure at the bottom. When the destruction device is in operation, the propulsion structure propels the combustion agent, the spreading structure quickly spreads the combustion agent over a large area, and finally the electric ignition head of the combustion structure ignites, achieving the effect of large-area destruction.

[0026] The cavity conduit section consists of three sections. The first cavity conduit 15-1 extends from the top of the device to the upper portion of the piston 3. This section primarily houses the electric telescopic rod 2, which propels the piston 3 at a constant speed. The second cavity conduit 15-2 extends from the lower portion of the piston 3 to the upper portion of the barrier plate 5. This section stores the combustion agent 12. Therefore, the barrier plate 5 seals this portion of the cavity bottom. The third cavity conduit 15-3 extends from the lower portion of the barrier plate 5 to the telescopic nozzle 7.

[0027] The propulsion mechanism utilizes two combined structures. The first consists of an electric telescopic rod 2, a piston 3, a rigid rod 4, and a blocking plate 5. The second consists of a spring 6, a telescopic nozzle 7, a connecting wire 8, and a spring switch wire 14. These two combinations provide a boost to the incendiary agent 12. In the first combined structure, the upper end of the electric telescopic rod 2 is connected to the equipment top cover fixed to the upper end of the first cavity pipe 15-1, and the lower end is connected to the upper end of the piston 3, which is used to push the piston 3 downward within the first cavity pipe 15-1. The lower end of the piston 3 is connected to the blocking plate 5 located at the bottom of the second cavity pipe 15-2 via the rigid rod 4. The blocking plate 5 is fixed to the bottom of the second cavity pipe 15-2, blocking the incendiary agent 12 within the second cavity pipe 15-2. In the second combined structure, one end of the connecting wire 8 is connected to the first circuit switch 13-1 and the second circuit switch 13-2, and the other end is connected to the outside of the telescopic nozzle 7. One end of the spring 6 and the spring switch wire 14 are connected to the outer wall of the third cavity pipe 15-3, and the other end is connected to the outer wall of the telescopic nozzle 7. The spring 6 is in a pre-compression state under the restriction of the spring switch wire 14, and the telescopic nozzle 7 is in a contracted state.

[0028] The dispensing mechanism utilizes a power supply 1, a first circuit switch 13-1, a second circuit switch 13-2, a centrifugal fan 11, and a delay circuit (including a fixed resistor R1, a sliding rheostat R2, a capacitor C, an NE555 delay chip, and an inverter). The positive terminal of the power supply is split into two paths after passing through the fixed resistor R1, the first circuit switch 13-1, the centrifugal fan 11, and the electric telescopic rod 2 (M2). One path is connected to ground via the second circuit switch 13-2, and the other path is connected to pin 2 of the NE555 delay chip. Pin 1 of the NE555 delay chip is connected to ground, while pin 2 is connected to ground via the second circuit switch 13-2. Pin 3 is the output, connected to the inverter, and then to the ignition system's electric ignition head 10 (C). Pin 4 is connected to pin 8 and then to the negative terminal of the power supply, which is then grounded. Pin 6 is connected to pin 7 and then to the positive terminal of capacitor C. One end of the sliding rheostat R2 is connected to the positive terminal of the power supply 1, and the other end is connected to the positive terminal of capacitor C, which is grounded. The power supply 1 is located at the top of the entire device, the first circuit switch 13-1 and the second circuit switch 13-2 are located outside the overall cavity pipe, and the centrifugal fan 11 is located in the cavity pipe 15-3. The specific circuit structure is: the delay circuit is connected in series with the ignition system, the centrifugal fan 11 is connected in series with the electric telescopic rod 2, and in parallel with the delay circuit and ignition system. The overall circuit diagram is as follows Figure 3 .

[0029] The combustion structure part uses a combination of a screen 9 and an electric ignition head 10. The screen 9 is located at the bottom of the telescopic nozzle 7, and the electric ignition head is located outside the bottom of the telescopic nozzle 7.

[0030] When the propulsion mechanism is in operation, the first and second circuit switches 13-1, 13-2 are closed by the pull of the connecting wire 8, completing the circuit. The electrically operated telescopic rod 2 begins to push the piston 3 downward, which in turn drives the rigid rod 4 and the stop plate 5 downward. At this point, due to the pressure of the piston 3 and its own weight, the incendiary agent 12 enters the third cavity conduit 15-3 from the second cavity conduit 15-2, moving downward. The second cavity conduit 15-2 is coated with polytetrafluoroethylene (PTFE) on the inner side of the cavity, and the piston 3 is made of polytetrafluoroethylene (PTFE) with carbon black added. This material has a high conductivity, effectively reducing static electricity. It also has a low coefficient of friction, effectively addressing the friction sensitivity and anti-static issues of the incendiary agent 12. The spring switch wire 14 restrains the spring 6 when the device is stationary. When in use, the spring switch wire 14 is cut off, and the spring 6 provides the power to push the telescopic nozzle 7 into the target cavity. Because the load is small, there is no unbalanced spring loading. When the telescopic nozzle 7 reaches its maximum limit, the connecting line 8 pulls the first circuit switch 13-1 and the second circuit switch 13-2 to close them, starting the centrifugal fan 11 of the spreading structure and the electric ignition head 10 of the combustion structure. Since the electric ignition head 10 is installed at the bottom of the telescopic nozzle 7, the material of the telescopic nozzle must be resistant to high temperatures and have good ductility, so high-temperature resistant silicon carbide material can be selected. The telescopic nozzle is usually a gradual expansion type or a straight-through type. The diffusion angle of the gradual expansion nozzle is controlled between 10°-30°, so that the powder and air can be fully mixed and the risk of backfire can be reduced. This embodiment adopts a gradual expansion nozzle and changes the diffusion angle of the telescopic nozzle 7, which can achieve the large-area damage feature of the device.

[0031] Assume that the inlet diameter of the telescopic nozzle is D1, the outlet diameter is D2, and the total length of the telescopic nozzle after being extended is L. The calculation formula of the diffusion angle α (half angle) is

[0032]

[0033] Assuming the blowing distance is L0, if you want to calculate the horizontal cross-sectional area at a certain height (such as the coverage area on the ground), it is still

[0034]

[0035] Where A is the horizontal cross-sectional area, π is the circumference of a circle, and R is the radius of the horizontal cross-sectional area.

[0036] When the spraying mechanism is in operation, connecting line 8 opens first circuit switch 13-1 and second circuit switch 13-2, completing the circuit and activating centrifugal fan 11. Rotating guide vanes at the outlet of centrifugal fan 11 simultaneously change the wind direction from horizontal to vertically downward, rapidly spraying the combustible 12 into the target cavity. By varying the wind speed of centrifugal fan 11 and the direction of the nozzle of telescopic nozzle 7, the blowing distance and direction of the combustible 12 can be varied, changing the coverage area of the combustible 12 and achieving a controllable damage effect.

[0037] The overall circuit diagram of the device is as follows Figure 4 As shown, when the first circuit switch 13-1 and the second circuit switch 13-2 are closed, the circuit between the centrifugal fan 11 and the electric telescopic rod 2 is closed, and the centrifugal fan 11 (M1 in the circuit diagram) and the electric telescopic rod 2 (M2 in the circuit diagram) work normally. At the same time, Pin2 (TRI) of the NE555 (delay chip) is grounded. The voltage of Pin2 is less than the power supply VCC voltage. , Pin3 output is turned on, the final output is low level, the ignition system spark plug 10 (C in the circuit diagram) does not work. Pin6 (Threshold) is connected to the positive electrode of the capacitor. When the capacitor is detected to be charged to the power supply VCC voltage The output of Pin3 is low, and capacitor C discharges until the voltage returns to 0. The ignition system starts working. At the same time, the delay time can be changed by adjusting the resistance of the sliding rheostat R2. The calculation formula for the delay time T should be: T = 1.1·R2·C. Where R2 is the resistance of the sliding rheostat, and C is the value of the capacitor. The specific delay circuit diagram is as follows Figure 4 .

[0038] When the combustion structure is working, the fuel 12 is ejected outward through the screen 9, and the electric ignition head 10 ignites the fuel 12. The screen 9 can prevent the fuel from agglomerating, thereby increasing the distribution area of the fuel 12. At the same time, since the screen 9 needs to withstand the high temperature of the combustion of the fuel 12, the screen 9 should also be made of silicon carbide material. The electric ignition head 10 of the combustion structure uses a pulse electric ignition head for ignition. After a short delay of the delay circuit, when the centrifugal fan 11 blows the fuel 12 out of the screen 9, the ignition system starts working, and the electric ignition head 10 starts electric ignition to ignite the fuel 12. The motion trajectory of the powder particles can be approximated as uniformly accelerated linear motion. According to the uniformly accelerated linear motion formula:

[0039]

[0040] Where g is the acceleration due to gravity, h0 is the vertical distance from the initial position of the blocking plate 5 to the centrifugal fan outlet, and t0 is the time it takes for the combustion agent 12 powder particles to move from the initial position of the blocking plate 5 to the centrifugal fan outlet. The specific extended time t1 can be calculated as:

[0041] t1=t2+t0

[0042] where v p is the wind speed, and h1 is the vertical distance from the centrifugal fan 11 to the fully extended outlet of the telescopic nozzle 7. Since the above formula ignores the acceleration time of the powder particles to the wind speed, the time t2 for the fuel to pass through the telescopic nozzle 7 needs to be multiplied by the coefficient β, which should be 1.01 according to the derivation. The specific formula is:

[0043]

[0044] At the same time, in order to prevent the occurrence of backfire, it is assumed that the ejection velocity is v p , burning speed v b , ensuring the ejection velocity v of the powdered combustion agent 12 p Greater than the burning velocity v b At the same time, suitable nozzles and fans can ensure stable ejection speed, usually ensuring v p At least v b 1.2 times, that is, v p ≥1.2v b At this time, because the pipe length is limited, the ejection speed v p It can be approximated as the initial wind speed of the centrifugal fan 11, and the combustion speed v b The combustion rate formula based on combustion heat and heat conduction is:

[0045]

[0046] where v b represents the combustion velocity, k is the thermal conductivity of the combustion agent, T f is the combustion temperature, T0 is the ambient temperature, Q is the heat released by the complete combustion of unit mass of fuel, and π is pi.

[0047] The specific implementation method is: ensure that the telescopic nozzle 7 is aligned with the aperture, the piston 3 is in the initial position of the cavity, the blocking piece 5 is in the specified position, the seal is intact and there is no leakage of the combustion agent 12, the spring switch line 14 is not damaged, the spring 6 is in a compressed state, the power supply 1 is turned off, the connecting line 8 is not broken, and the circuit is disconnected. When the device is in use, use scissors or a knife to cut the spring switch line 14, and the telescopic nozzle 7 begins to enter the target cavity. When the spring 6 is extended to the maximum length, the connection line 8 is pulled to be tight, and the connecting line 8 pulls to open the first circuit switch 13-1 and the second circuit switch 13-2. At this time, the electric telescopic rod 2 begins to push the piston 3 downward at a uniform speed, and the piston 3 drives the rigid rod 4 and the blocking plate 5 to move downward at the same time. The combustion agent 12 is assisted by the piston 3 and reaches the third cavity pipe 15-3 through the hole. At the same time, the centrifugal fan 11 of the spreading structure starts to work, and the combustion agent 12 is quickly sprayed into the target cavity along the telescopic nozzle 7 through the screen 9. After a short delay, the electric ignition head 10 of the ignition system in the combustion structure is electrically ignited, igniting the sprayed combustion agent 12, thereby causing large-scale damage to the inside of the target cavity.

Claims

1. A large-area precision-controlled burning and damage equipment, characterized by: include: The pipeline is provided with three cavity pipelines for installing the propulsion device, the combustion agent and the fan respectively; A propulsion device is used to propel the combustion agent toward the cavity pipe on the fan side when powered; The fan is used to blow the combustion agent into the telescopic nozzle when the power is on; A telescopic nozzle is provided at the bottom of the pipe, is used to extend to the target cavity, and can pull the circuit switch to close through the connecting wire; The electric ignition head is arranged at the bottom of the telescopic nozzle and is used to ignite the fuel when the power is on; A limiting mechanism is used to limit the position of the telescopic nozzle so that the telescopic nozzle is in a retracted state under normal circumstances; Circuit switch module, serving as the power switch for the power supply, propulsion device, fan and delay circuit; The delay circuit is used to delay the start of the electric ignition head after the telescopic nozzle and fan are working.

2. The large-area precision controlled burning and damage equipment according to claim 1 is characterized in that: The delay circuit includes a fixed resistor R1, a sliding variable resistor R2, a capacitor C, a delay chip, and an inverter; the circuit switch module includes a first circuit switch and a second circuit switch; The positive electrode of the power supply is divided into two paths after passing through the fixed resistor R1, the first circuit switch, the fan, and the propulsion device. One path is grounded through the second circuit switch, and the other path is connected to pin 2 of the delay core; pin 1 of the delay core is connected to the ground, pin 3 is connected to the inverter and then connected to the electric ignition head of the ignition system, pin 4 is connected to pin 8 and connected to the negative electrode of the power supply, pin 6 is connected to pin 7 and connected to the positive electrode of capacitor C, and the negative electrode of capacitor C is grounded; the electric ignition head is grounded; one end of the sliding rheostat R2 is connected to the positive electrode of the power supply, and the other end is connected to the positive electrode of capacitor C.

3. The large-area precision controlled burning and damage equipment according to claim 2 is characterized in that: satisfy: 1.1·R2·C=t2+t0 Where R2 is the resistance of the sliding transformer, C is the value of the capacitor, t0 is the movement time of the combustion agent powder particles from the initial position to the centrifugal fan outlet, t2 is the time for the combustion agent to pass through the telescopic nozzle, β is the setting coefficient, v p is the fuel ejection velocity, and h1 is the vertical distance between the centrifugal fan and the outlet of the telescopic nozzle after it is fully extended.

4. The large-area precision controlled burning and damage equipment according to claim 3 is characterized in that: in v p ≥1.2v b where v b is the combustion velocity, k is the thermal conductivity of the combustion agent, T f is the combustion temperature, T0 is the ambient temperature, and Q is the heat released by the complete combustion of unit mass of the fuel.

5. The large-area precision controlled burning and damage equipment according to claim 1 is characterized in that: The limiting mechanism adopts a spring and a connecting line arranged between the pipeline and the telescopic nozzle, and the spring is in a compressed state under normal conditions.

6. The large-area precision-controlled burning and damage equipment according to claim 1 is characterized in that: A screen is provided at the bottom of the telescopic nozzle.

7. The large-area precision controlled burning and damage equipment according to claim 1 is characterized in that: The propulsion device includes an electric telescopic rod 2, a piston 3, a rigid rod 4, and a blocking plate; the electric telescopic rod is connected to the piston and is used to push the piston to move in the pipeline. The piston is connected to the blocking plate through the rigid rod, and the blocking plate is used to seal the burner.

8. The large-area precision controlled burning and damage equipment according to claim 1 is characterized in that: The pipeline is provided with a polytetrafluoroethylene coating applied to the inner side material of the cavity.

9. The large-area precision-controlled burning and damage equipment according to claim 1 is characterized in that: The telescopic nozzle is of a gradually expanding type, and the diffusion angle is controlled between 10° and 30°.

10. The large-area precision-controlled burning and damage equipment according to claim 1 is characterized in that: The telescopic nozzle is made of silicon carbide.

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