JPH035219B2 - - Google Patents

Description

Claim 1: An explosive cylinder 1 having a batching device 2 for powder of the material to be sprayed and an ignition device 3, and a fuel gas supply connected to a gas mixing device 5 having devices 15, 21, 28 for changing the gas pressure. line 6, inert gas supply line 7, oxygen gas supply line 8, gas flow rate measurement devices 17, 23, 30, and normally closed main valves 19, 25 connected in series to these in the gas flow direction. 32 and fuel gas supply line 6
and the normally closed main valve 1 of the oxygen supply line 8
9, 32, an explosion detector 42 that is acoustically connected to the explosion tube 1 and electrically connected to the gas supply control device 39, and a gas supply control device 39 and ignition device 3
It has a control system 40 that is electrically connected to, and three types of gas supply source devices 10, 11, 12 provided outside the building in which each of the above devices is installed,
The first gas supply device is connected to the fuel gas supply line 6, the second gas supply device is connected to the inert gas supply line 7, and the third gas supply device is connected to the oxygen supply line 8. In the explosive flame spraying device connected to the gas supply control device 39, the fuel gas supply line 6 and the oxygen supply line 8 are connected to gas supply source devices 10 and 12 outside the building, respectively, and electrically connected to the gas supply control device 39. Explosive flame spray device characterized in that it has a normally closed auxiliary valve 13, 27 connected to.

2 Fuel gas supply line 6 and oxygen supply line 8
each of which has one or more gas pressure pickups 36, 37 located within said building, said pickups 36, 37 being electrically connected to a gas supply control device 39. Explosive flame spray device according to paragraph 1.

3. When there are two gas pressure pickups in the fuel gas supply line, one of the pickups is attached to a pressure reduction measuring device and connected to the flow rate measuring device and the normally closed main valve 19. Explosive flame spraying device according to claim 2.

4 has two pipes 44, 45 and two normally closed auxiliary valves 47, 48, one end of each pipe is connected to the inert gas supply line 7 outside the building.
The other end of the one pipe line 44 is connected to the normally closed valve 1 of the fuel gas supply line 6.
3, and the other pipe line 46
The other end of the fuel gas supply line 6 is connected to the immediately downstream side of the normally closed main valve 19, and the two normally closed auxiliary valves 47, 48 are attached to each pipe line 44, 45, respectively. 4. The explosive flame spray device according to claim 1, wherein the explosive flame spray device is electrically connected to a control system 40.

TECHNICAL FIELD This invention relates to flame coatings, and more particularly to explosive flame spray devices.

BACKGROUND OF THE INVENTION Safety problems with explosive flame spray equipment using gaseous fuels, such as acetylene gas and oxygen, arise when carrying out the explosive flame spray process, especially when the explosive spray equipment is specifically constructed for explosive spray operations. This occurs when the equipment is installed in a building that is not

Conventionally known explosive flame spray devices (SS Bartenov, Yu.P.
Fedko, AI Grigorov; Explosive flame coatings in mechanical engineering; 1982, Mashinostroenie Publishing House
Publishers) (Leningrad branch office)
(see pages 118-119, published by Subsidiary)) incorporates the following devices: That is, an explosion cylinder having a flame spraying explosive batching device and an ignition device, a gas mixing device connected to this cylinder, a fuel supply system having devices connected to the gas mixing device to change the pressure, and oxygen gas. a supply system and an inert gas supply system, a control device, a gas flow meter, a normally closed main valve attached in series thereto, and a normally closed main valve of the fuel supply system and the oxygen gas supply system. a gas supply control device electrically connected to the valve; an explosion detector acoustically connected to the barrel and electrically connected to the gas supply control device; and a gas supply control device and an ignition device. an electrically connected control system;
3 installed outside the building where each of the above equipment is installed
a first gas source device in the fuel source line, a second gas source device in the oxygen source line, and a third gas source device in the inert gas source line. Connected to gas supply line.

A significant drawback of this conventional explosive flame spray system is that the fuel gas source device and the oxygen source device cannot be quickly disconnected if the gas supply system becomes loose. the gas supply source device;
In particular, if the fuel gas supply system (for example, the acetylene gas supply source device) becomes loose, the building will be filled with a large amount of air and fuel gas, which will mix in a situation that is likely to cause an explosion, which is extremely dangerous. The explosive flame spray equipment cannot be used for production in buildings that are not designed for flame spray.

Moreover, in order to ensure the safety of the gas supply line, the valve of the explosive flame blowing device is installed immediately upstream of the gas mixing device, but this valve is subject to the thermal effect of the impact of the explosion, and this thermal effect is particularly Damage to the normally closed main valve of the fuel gas (acetylene gas) supply line. Therefore, the main valve is not allowed to loosen when closed. If something goes loose, the flame traces back to the gas mixing device, or if the igniter is activated accidentally, i.e. the explosion detector does not detect another explosion and the gas supply is interrupted. Even if a command is clearly issued to return the normally closed main valve to its initial position when it should be stopped, the supply of gas, such as acetylene gas, continues. If the flame has traced back to the gas mixing device and the next explosion shock does not occur, if the supply of acetylene gas is continued, the gas mixing device will be overheated, and therefore the flame will be further transmitted to the fuel gas supply system. Go back in time. This is because acetylene gas automatically decomposes when heated. If ignition current does not flow to the igniter due to a malfunction in the ignition system, and the supply of acetylene gas is continued, the acetylene gas will accumulate in the building where the above-mentioned explosive cylinder is installed and reach an explosive concentration. Even if the fuel supply device can be disconnected very quickly through the efforts of the workers, there is a risk that explosive gas will accumulate.

Therefore, if the reliability of the normally closed main valve is low, especially if the main valve of the fuel gas supply line is unreliable, the safety of the entire explosive flame spraying device is reduced.

The above-mentioned explosive flame spraying device cannot be objectively controlled, for example, quantitatively checking that the gas mixing device is operating normally. When the gas to be mixed is continuously supplied, the gas mixing device consists of a well-known jet-type mixing device, and it is important not only for process stability that this gas mixing device is in a normal state. , is also extremely important for the safety of the entire explosive flame spray device.

Finally, the above-mentioned explosive flame spraying device is designed to
or the fuel gas supply line of the device cannot be filled with inert gas when some danger exists (for example, in an emergency situation, ie, when there is a risk of explosion). Therefore, the above-mentioned explosive flame spraying device has the disadvantage that its usable range within normal facilities is limited from a safety standpoint.

DISCLOSURE OF THE INVENTION The present invention is an explosive flame spraying device having a fuel gas supply line and an oxygen supply line, these supply lines having an auxiliary member, and the auxiliary member providing the entire explosive flame spraying device with a fuel gas supply line and an oxygen supply line. The objective is to provide an explosive flame spray device that improves speed limits, safety, and reliability.

The above object is achieved by an explosive flame blowing device having the following various devices. That is, the above-mentioned explosive flame spraying device includes an explosion tube having a batch device for powder of the material to be sprayed and an igniter, a gas mixing device connected to the explosion tube, and a fuel gas supply connected to the gas mixing device. line, oxygen supply line,
and an inert gas supply line, a device for changing the pressure of each of the gases provided in each line, a control device, a flow rate measuring device for the gas, and usually arranged in series in the flow direction of the gas. a main valve that is closed, a gas supply control device that is provided in the fuel gas supply line and the oxygen gas supply line and that is electrically connected to the normally closed main valve, and that is acoustically coupled to the explosion cylinder and It has an explosion detection device electrically connected to the gas supply control device, and a control system electrically connected to the gas supply control device and ignition device, and each of the devices is installed in the building. The explosive flame spraying device has three types of gas supply source devices installed outside the building, and a first gas source device of the gas source device is connected to the fuel gas supply line. , a second gas supply source device is connected to the oxygen gas supply line, and a third gas supply source device is connected to the inert gas supply line. Both gas supply lines have normally closed auxiliary valves located outside the building and connected to the gas source device and electrically connected to the gas supply control device.

In the explosive flame spray device according to the present invention, both the fuel gas supply line and the oxygen gas supply line have one or more gas pressure pickups, and the pickups are electrically connected to the gas supply control device. It is preferable that the above-mentioned building be provided with the same structure as the above-mentioned building.

In the above explosive flame spraying device according to the present invention, two gas pressure pickups are provided in the fuel supply line, one of the gas pressure pickups is preferably used for pressure reduction measurement, and a gas flow rate measurement device and It is attached to the above main valve which is normally closed.

The explosive flame blowing device according to the present invention has two pipes, one end of each pipe is connected to the inert gas supply line outside the building, and one end of each pipe is connected to the inert gas supply line outside the building. The other end of the pipe is connected to the fuel gas supply line, and the connection position is immediately downstream of the normally closed auxiliary valve of the fuel gas supply line, and the other end of the other pipe is connected to the fuel gas supply line. It is connected to the fuel gas supply line, and its connection position is immediately downstream of the normally closed main valve of the fuel gas supply line, and two normally closed auxiliary valves are respectively attached to each of the pipes and the connection position is immediately downstream of the normally closed main valve. Preferably, it is electrically connected to a control system.

The present invention prevents the formation of an explosive mixture within the manufacturing plant building when the fuel gas supply line becomes loose, and reduces the risk of flames occurring when the oxygen supply line becomes loose. .

At the same time, the overall reliability of the explosive flame blowing device according to the invention is improved by an order of magnitude in the event of a typical malfunction of the normally closed main valve of the fuel gas supply line.

Furthermore, since it is possible to quickly and quantitatively evaluate whether the gas mixing device according to the present invention is in a normal state, the overall safety of the explosive flame spraying device is improved.

Finally, the explosive flame spray device according to the present invention is capable of scavenging the fuel gas supply line with an inert gas, so that when the explosive flame spray device is out of service for a long period of time, it is possible to scavenge the surrounding area by the fuel gas and other gases. Contamination can be prevented, and the gas mixing device and explosive canister can be quickly scavenged in an emergency situation.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an explosive flame spray device according to the invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

The explosive flame spraying device has an explosive cylinder 1 disposed in a building, and a powder batching device 2 for spraying is attached to the end of the explosive cylinder 1 so as to close this end. The interior space of the explosion tube 1 is connected to an ignition chamber 3, into which an ignition device (hereinafter referred to as an ignition plug 4) is inserted and screwed. The ignition chamber 3 is provided with a gas mixer 5, which is an injection type gas mixer widely used for flame spraying. A fuel gas supply line 6, an inert gas supply line 7, and an oxygen supply line 8 (hereinafter referred to as an acetylene line 6, a nitrogen line 7, and an oxygen line 8) are connected to one end of the gas mixer 5. Ru. Each of the components 1 to 5 and the work piece are installed in a soundproof spray booth (not shown). The other end of each of the lines 6 to 8 extends outside through the outer wall 9 of the building, and a gas supply source device 10 is installed outdoors adjacent to the outer wall 9.
to 12 (hereinafter, acetylene source 10, nitrogen source 1
1 and an oxygen source 12), respectively. The acetylene line 6 includes an auxiliary valve 13 installed outside the building and normally closed, a gas pressure pickup 14 (for example, an electrical contact separation type pressure gauge), and a device 15 for changing the gas pressure.
(e.g., a group of pressure reducing valves), a control valve 16, a gas flow measuring device 17 (e.g., a flowmeter with a constant differential pressure or a well-known rotameter), and a pressure and vacuum measuring device 18 (e.g., an electrical contact separation type pressure vacuum gauge), a normally closed main valve 19, and a fire spread prevention device 20 (for example, a porous fireproof wall) (all of these devices 14 to 20 are installed indoors). The nitrogen line 7 includes a device 21 for changing the gas pressure (gas pressure reducing valve 21), a control valve 22, a gas pressure gauge 23 (rotameter), a gas pressure pick-up 24 (pressure gauge), a main valve 25 which is normally closed, and A check valve 26 is provided, and each of these devices is mounted in the direction of nitrogen flow. The oxygen line 8 has an auxiliary valve 27 installed outside the building and normally closed, and the following devices installed inside the building: a device 28 (pressure reducing valve) for changing the pressure of oxygen, and a control valve 29. , oxygen gas flowmeter 3
0 (rotameter), pressure pick-up 31 (pressure gauge), normally closed main valve 32, and check valve 3
3, and each of these devices 28 to 33 is connected in the direction of oxygen gas flow. The pressure pickups 14, 31 have contacts 34, 35 corresponding to the maximum pressure and contacts 36, 36 corresponding to the minimum pressure, respectively.
37, and the pressure pickup 18 has a contact 38 corresponding to the maximum pressure. The contacts 34 to 38 are connected to the inlet of a gas supply control device 39, and the outlet of the gas supply control device 39 is connected to the normally closed auxiliary valve 13 and the main valve 1 of the acetylene line.
9 and a normally closed auxiliary valve 27 in the oxygen line 8
and the main valve 32. The output of the control device 40 is connected to a pressure supply device 41 , a device 41 for periodically varying the pressure, and a spark plug 4 . The output of the pressure varying device 41 is connected to the normally closed main valve 25 of the nitrogen line. An explosion detector 42 made of a carbon microphone is installed in the spray booth and acoustically connected to the cylindrical member, ie, the explosion tube 1. The output of the sensor 42 is input to the gas supply control device 39 and the pressure changing device 41. The device 41 for changing the pressure has a pickup 43 of a gas analyzer, which pickup 43 is connected to the control device 40. The acetylene line 6 and nitrogen line 7 are connected by a conduit 44 provided outside the building, and are also connected to a conduit 45. This conduit 45 is connected at one end to the nitrogen line outside the building and at the other end to the oxygen line inside the building, immediately downstream of the normally closed main valve 19 of this nitrogen line. connected to. The pipe line 44 includes a valve 46 and a check valve 4 which are normally closed in the direction of flow of nitrogen gas.
7 is attached, and this valve 46 is connected to the control device 4.
electrically connected to 0. A normally closed valve 48 and a check valve 49 are attached to the pipe line 45 in the direction in which the nitrogen gas flows, and the valve 48 is connected to the control device 40 .

The explosive flame spray device according to the invention has several modes of operation. That is, the operating modes are "gas mixing device normal state confirmation mode", "acetylene ventilation mode", "spraying mode", "acetylene scavenging mode", and "emergency mode".

The "gas mixing device control state confirmation mode" is a preparatory mode, and is a mode for detecting an accidental malfunction of the jetting type gas mixing device 5 before starting the spraying operation.

This is a mode for preparing for the above-mentioned "acetylene ventilation mode", and is carried out immediately after the above-mentioned "gas mixing device normal state confirmation mode" is executed. The reason this mode is necessary is that depending on the factory, the gas supply line,
This is particularly because the scale of the acetylene line 6 is large, and the pressure of the acetylene gas in the gas mixing device may be relatively low.

The above-mentioned "spraying mode" is the basic operating mode, and is for coating by the above-mentioned explosive flame spraying method.

The above-mentioned "acetylene scavenging mode" is the final stage mode, and is executed after the above-mentioned "spraying mode". This mode is of particular importance and is used when no acetylene gas is allowed to pass through the acetylene line 6 for long periods of time (e.g. overnight) under given operating conditions, or when it is not allowed to leave acetylene gas. Ru.

The above-mentioned "emergency mode" may be activated, for example, if there is a risk of explosion in the spray booth, if the ventilation system does not operate, if the acetylene line or oxygen line in the spray booth is damaged or loosened, or in other cases. In the event of an emergency situation, the system is automatically activated or initiated by operator operation.

The above explosive flame spray device operates as follows.

Before opening the acetylene gas supply source device 10, the nitrogen gas supply source device 11 and the oxygen gas supply source device 12 are opened, and the acetylene line, nitrogen line,
and bring the oxygen line to the specified pressure.

Next, using the control system 40, the mode is set to the "gas mixing device normal operation state confirmation mode". In this mode, the electrical connection between the gas supply control device 39 and the contacts 34 to 38 is cut off. At the same time, the normally closed auxiliary valve 27 and main valve 32 of the oxygen line 8 and the normally closed main valve 19 of the acetylene line 6 are opened. The normally closed auxiliary valve 13 of the acetylene line 6 is kept closed from the beginning. Next, in order to flow oxygen from the oxygen gas supply source device 12 to the oxygen line 8, the auxiliary valve 27 and the pressure reducing valve 28 are opened, and the control valve 29 and the flow meter 30 are opened.
is fully opened, the valve 32 is opened, the check valve 33 is connected to the gas mixing device 5, and the explosion tube 1 is connected via the ignition chamber 3. Spark plug 4 is not yet activated in this mode. The worker operates the pressure reducing valve 28 to adjust the pressure of oxygen gas to a value necessary for checking the pressure gauge 31, and operates the valve 29 while watching the flow meter 30 to adjust the flow rate of oxygen. When oxygen is ejected, this oxygen becomes a carrier fluid and the downstream side of the acetylene line 6 from the closed valve 13 is reduced in pressure. This reduced pressure is under normal operating conditions, for example -0.5 in the gas mixing device 5.
Kg/cm ² to -0.4 Kg/cm ² , and this reduced pressure value is indicated on the pressure gauge 18. If this reduced pressure value is within the allowable range, the gas mixing device is in normal operation.
It is ready for spraying operation. If the above pressure reduction is not performed or if this pressure reduction is not appropriate, spraying cannot be performed to ensure safety.

When the pressure cannot be reduced or cannot be carried out properly, there is an abnormality in the gas mixing device 5, such as blockage or loosening, or there is a loosening in the acetylene gas supply line 6. If this state continues for a predetermined period of time, the control system 40 automatically stops the "gas mixing device normal operation confirmation mode" and returns the valves 27, 32, and 19 to their initial positions.

After confirming the normal operation of the gas mixing device 5, the operator operates the control system 40 to set the "acetylene ventilation mode". In this mode, the spark plug 4 is not yet activated, and the contacts 34, 36 of the pressure gauge 14,
38 and the pressure vacuum gauge 18 are disconnected. The normally closed auxiliary valve 13 of the acetylene line 6 is opened, and the normally closed main valve 19 of this line 6 is still closed. During the above-mentioned "gas mixing device normal state confirmation mode", the acetylene line 6 is depressurized, and the acetylene gas flows through the acetylene line 6 through the acetylene gas supply source device 10, the opened valve 13, the pressure reducing valve 14, and the pre-adjustment. It flows to the main valve 19 through the opened valve 16 and flow meter 17.

The worker operates the pressure reducing valve 15 to adjust the pressure of the acetylene gas, and while watching the pressure vacuum gauge 18, brings the pressure of the acetylene gas to a pressure that allows spraying work, and closes the valve 16. The above-mentioned "acetylene venting mode" is terminated by a signal from the control system 40 after a preset period of time, the auxiliary valve 13 is returned to its initial closed position, and the explosive flame spraying device is enabled for spraying operation. become a state.

When the operator operates the control system 40 to set the "spraying mode", the pressure gauge 1 of the acetylene line
4 contacts 34, 36 and pressure vacuum gauge 18 contact 3
8 and contacts 35 and 37 of the pressure gauge of the oxygen line 8 are electrically connected to a gas supply control device 39.
If the pressures of the acetylene gas and oxygen are within the preset range for carrying out the predetermined process, that is, if no signal is received on the leads electrically connecting the contacts 34 to 37 and the control system 40. , by pressing a pushbutton (not shown) on the control system 40 to close the acetylene gas supply line 6.
Gas is simultaneously supplied to the normally closed auxiliary valve 13 and main valve 19 of the oxygen line 8, and the valves 27, 32 of the oxygen line 8. The valves 27 and 32 are kept open until the spraying operation time has completely elapsed (provided that the gas pressure is within a preset range), and the acetylene gas and oxygen are kept open. The gas is supplied at a flow rate determined according to the capacity of the explosive cylinder 1, and the gas mixing device 5 is supplied according to the capacity of the explosive cylinder 1.
parameters and the speed of the discharge pulse sent to the spark plug 4 from the control system 40 are determined.

For example, if the push button is pressed while the acetylene line 6 is loose, the supply of acetylene gas from the acetylene gas supply source device 10 to the acetylene line 6 is automatically suspended (in such a state, the acetylene line 6 is Pressure is pressure gauge 1
(This is because it is lower than the preset value of 4).
Valve 13 and valves 19, 2 for gas supply device 39
A signal is sent to open 7,30.

Just as above, if the acetylene line 6 becomes loose during spraying, a signal is sent from the contact 36 to the gas supply control device 39, which immediately closes the valves 13, 19, 27, 32. The supply of the gas is stopped.

What is extremely important is that the normally closed auxiliary valve 13 closes the acetylene line 6, and the installation position of this auxiliary valve 13 is immediately downstream of the acetylene gas supply device 10, and is located on the outside wall of the building. It is on the upstream side of the inlet position of the acetylene line 6 that extends through it. Therefore, the amount of acetylene sent into the building is determined by the length of the acetylene gas supply line from valve 13 to valve 19, regardless of the flow rate of gas that can be supplied by the acetylene gas supply source device 10. (Thus, the part of the acetylene line 6 between valves 13 and 19 has an inner diameter d of 10 mm and a length l of 200 mm.
m, the maximum flow rate V ₁ of acetylene gas sent into the interior of the building is 0.016 m ³ . ) The supply of acetylene gas is automatically stopped by closing the normally closed auxiliary valve 13 located outside the building. It can also be closed by remote control from an appropriate location, by the skill and appropriate actions of the worker, or by other human efforts. If the gas supply capacity g of the acetylene gas supply source device is 10 m ³ per second, and this is an explosive cylinder 1 with a capacity of 1 liter, the discharge rate of the ignition plug corresponding to this is 6 pulses per second, and there is no discharge into the building. Acetylene gas feed amount
If V ₁ is 1.6 m ³ and there is no auxiliary valve 13,
It takes 10 minutes to manually stop the supply of acetylene after the above-mentioned portion of the acetylene gas supply line 6 becomes loose and gas leakage begins. ) The above-mentioned explosive flame spraying device based on the present invention operates in the following manner as described above even when the oxygen line 8 becomes loose.

If the pressure in the acetylene line 6 exceeds the preset pressure in the acetylene line 6 (the part upstream of the pressure reducing valve 15) due to an adjustment error in the acetylene gas supply device 10 or other causes, A signal is sent to the line electrically connecting the contact point 34 corresponding to the preset maximum pressure and the gas supply control device 39, and this signal causes the auxiliary valve 1 of the acetylene line 6 and oxygen line 8 to be activated.
3, 27 and the main valves 19, 32 are closed (or not opened). By doing so, the danger level of the acetylene line 6 can be lowered. This is because the higher the pressure in an acetylene line, the higher the danger, and the higher the pressure, the more stable the flow.

Also, due to an adjustment error, the pressure regulating valve 1 was closed during spraying work.
5 has stopped functioning, or if the gas mixing device 5
Alternatively, if the check valve 20 is blocked, the pressure of the acetylene gas upstream of the valve 19 becomes higher than the preset value for the given working conditions, and the contact point corresponding to the maximum pressure on the pressure vacuum gauge 18 A signal is sent to a line electrically connecting the gas supply device 39 and the valves 13, 19,
27 and 32 are immediately closed, the supply of acetylene gas and oxygen gas is stopped.

Also, suppose that the pressure of oxygen gas is
If the pressure becomes higher than necessary to maintain predetermined operating conditions due to malfunction (for example, blockage) or maladjustment or loss of adjustment function of the pressure reducing valve 28, the contact point between the gas supply control device 39 and the pressure gauge 31 35, a signal is sent to the line connecting valves 13, 19, 2.
7, 32, the gas supply is stopped.

Naturally, when the acetylene gas supply source device 10 and the oxygen gas supply source device 12 become empty, gas is no longer supplied (this actually means that the above-mentioned explosive flame spraying device ceases to operate). ). In such a case, the pressure gauges 14, 31
The contacts 36 and 37 are activated, respectively.

If there is no slack in the acetylene line 6 and oxygen line 8 and the gas pressure in both lines is within the specified range, the worker can close the control valve 16 and the flowmeter 17.
is opened until it indicates the flow rate required for the above spraying operation.
Acetylene gas is supplied from acetylene gas supply source device 1
0 to the acetylene line 6 opened valve 13, pressure reducing valve 15, valve 16, flow meter 17, opened valve 19
The gas is then supplied to the gas mixing device 5 via the flame retrieval prevention valve 20. Oxygen gas is supplied from the oxygen gas supply device 12 to the gas mixing device 5 through the open valve 27 of the oxygen line 8, the pressure reducing valve 28, the valve 29, the flow meter 30, the opened valve 32, and the check valve 33. be done. Oxygen gas is the carrier fluid, and acetylene gas is the fluid from which it is ejected. Explosive gas is produced in a gas mixing device 5 and sent to the explosive tube 1 through an ignition chamber 3. Nitrogen gas is supplied from the nitrogen gas supply source device 11 of the nitrogen line 7 to a pressure reducing valve 21, a control valve 22,
and a portion of the conduit 44 up to the normally closed valve 46 via the flow meter 23, and a portion of the conduit 45 up to the normally closed valve 48. The time required for the explosive gas delivered from the gas mixing device 5 of a predetermined volume to fill the explosive cylinder 1 is preset in the form of a time interval, after which the control system 40 controls the pressure changing device 41. This device 41
opens the valve 25 of the nitrogen line 7, and the nitrogen gas is batched into minute amounts at a pressure slightly higher than that of the acetylene and sent to the gas injection part of the gas mixing device 5, and this sent nitrogen gas The acetylene gas supplied to the mixing section of the mixing device is dynamically prevented from mixing with the oxygen gas, i.e. forming a nitrogen "plug" which allows the flame after the explosion to take place in the gas mixing device 5. It works to prevent it from going back. Then, after the time required for the nitrogen gas to flow to the inlet of the ignition chamber 3, the control system 4
0 activates the dot plug 4.

The explosive gas is ignited in the ignition chamber 3, then enters the internal space of the explosive cylinder 1, and explodes inside the explosive cylinder 1. Before this explosion takes place, the material to be sprayed is ejected in powder form from the powder batching device 2 into the active part of the explosive tube 1. This injection is
This is performed each time an explosion shock is applied to the powder batching device 2 due to an explosion (if injection is performed,
In each case, a batch of powder is made for the next injection). The injected powder particles are heated and melted in the explosion tube 1, and the molten powder particles are accelerated by the gas generated from the explosion and travel straight through the explosion tube 1 at high speed, causing the surface of the workpiece to be It adheres to and covers it. In order to obtain the desired thickness of the coating, the explosion may be repeated several times in succession, if necessary. A loud sound (noise) enters the microphone 42 for each explosion. If the microphone 42 receives the above-mentioned loud sound, it indicates that the explosion tube 1, the ignition plug 4, and the gas mixing device 5 are operating normally, so safety can be confirmed.

The output signal of the microphone is sent to the pressure change device 41 and the gas supply device 39. This signal causes the pressure change device 41 to close the valve 25,
The gas supply control device 39 includes valves 13, 19, 27, 3
Open 2. The pressure and pulsed flow of the nitrogen gas acting as the "plug" can be adjusted by an operator operating the valves 21 and 22 according to the readings of the pressure gauge 24 and flow meter 23. The conditions for spouting acetylene may be readjusted by spouting it several times at first, if necessary.

If there is no next explosion sound, that is, if there is no output signal from the microphone 42 even after a certain period of time has elapsed, and if the certain period of time is slightly longer than the discharge interval of the ignition plug 4, it is possible that the ignition plug 4 has failed. Alternatively, it indicates that the flame has gone up to the gas mixing device 5. In the absence of a signal from the microphone 42, the valves 13, 15, 27, 32 are simultaneously closed by the gas supply device 39, and the gas mixing device 5
gas supply is stopped and no explosive gas is generated. Valve 25 of nitrogen line 7 still remains open for a predetermined period of time. This is to burn out the gas in the gas mixing device 5, and after the predetermined time has elapsed, the valve 25 is closed by the pressure changing device 41.

The explosive flame blowing device according to the present invention can distinguish between a failure of the spark plug and a flame flowing back into the gas mixing device 5. If acetylene gas is burning in the acetylene line 6, the pressure upstream of the gas mixing device 5 will rise, so a signal is sent from the contact 38 of the pressure vacuum gauge 18 to the gas supply device 39, and the gas A supply device 39 actuates valves 13, 19, 23, 32. The valves 13, 19, 27, and 32 operate this valve.
is opened before the signal from the microphone 42 disappears. Furthermore, if the spark plug 4 is out of order, the pressure vacuum gauge 18 will not work.
After the gas mixing device 5 is ignited, the explosion flame spraying device cannot start a repeating operation until after the flame has been extinguished, that is, after the signal from the contact point 38 has disappeared. .

If there is an explosion hazard in the spray booth, the ventilation system fails, a gas supply line ruptures, or other emergency occurs inside the spray booth, workers must use high-pressure nitrogen gas to prevent the flames. The device 20, the gas mixing device 5, the ignition chamber 3, and the explosive tube 1 are scavenged all at once. To do so, an emergency button (not shown) on control system 40 is pressed to open valve 48 .

At the same time, valves 13, 19, 27, 32 (if open) are closed. Nitrogen gas is sent from the pipe 45 to the downstream side of the normally closed valve 19 of the acetylene line via the open valve 48 and check valve 49, and is sent to the flameproofing device 20, the gas mixing device 5, and the ignition chamber 3. and scavenging the explosive tube 1.

The "emergency" state is automatically canceled after the time preset in the control device 40 has elapsed, and the "emergency" state and its cancellation are repeated a predetermined number of times as necessary (however, if the nitrogen gas is (only while in the source device 11). If the concentration of nitrogen in the booth reaches a level that prevents an explosion for some reason (exceeds 2% by volume), the detector 43 of the gas analyzer sends a signal to the control system 40 and automatically to initiate “emergency mode” as described above.

After the "spraying mode" is completed (eg, at the end of the work day), the operator commands the control system 40 to enter the "acetylene line scavenging mode." Then the valve 19 of the acetylene gas supply line 6
The normally closed valve 46 is simultaneously opened.
The valve 13 of the acetylene line 6 remains in its initial state (closed state). Nitrogen gas passes through the opened valve 46 and check valve 47 upstream of the position where it penetrates the outer wall 9 of the acetylene gas supply pipe 6 and enters the building, and flows from the pipe 44 into the acetylene gas supply line 6. flows into.

Nitrogen gas flows through the acetylene line 6, gas mixer 5, ignition chamber 3, and explosive tube 1 to displace or scavenge the acetylene gas and control system 40.
As in the case of the "spraying mode", a discharge current is applied to the ignition plug 4 in a pulsed manner. As long as the gas fed into the explosive tube 1 contains a sufficient amount of acetylene to ignite, this acetylene is combusted within the explosive tube 1. This "acetylene gas scavenging mode" is automatically stopped when a preset time has elapsed. Nitrogen gas is used in the "gas mixing device normal status confirmation mode" described above for the explosive flame spraying device.
It will be automatically removed.

The check valve 47 of the explosive flame blowing device according to the invention prevents acetylene gas from entering the line 44 and valve 46. The check valves 26, 33, 49 also
Acetylene gas flows from controlled valves 25, 32, 48 to nitrogen line 7, oxygen line 8, and conduit 45.
Prevent from entering the exit side.

What is important about the operation of the explosive flame blowing device according to the invention is that when any stop signal is issued as described above, the normally closed 2
The two valves are closed at the same time.

If one valve, for example main valve 1 which is normally closed,
If the probability of occurrence n ₁ of 9 failures (for example, when they do not close when they should) is 10 ^-3 (i.e., the number of failures occurring is 1 per 1000 operations), then two valves installed in series , for example, the probability that the normally closed auxiliary valve 13 and main valve 19 will fail at the same time.
Since n ₂ is (n ₁ ) ² or 10 ^-6 , the reliability of the explosive flame blowing device according to the invention is substantially improved. From this point of view, for example, acetylene line 6
After valve 19 is closed, no acetylene gas is delivered to the booth in sufficient quantities to cause an explosion. This is because the acetylene gas source device 10 is in a closed state by the normally closed auxiliary valve 13. In this case, only the acetylene remaining in the acetylene line 6 is sent to the booth, although it is small compared to the volume of the booth (the volume V ₂ of the acetylene line is 0.016
m ³ and the volume of the booth V ₃ is 2.0 m ³ , the concentration of acetylene gas in this booth C
is C=(0.016/2)×100(%) =0.8%<2%). Similarly, even if the valve 19 is loosened after being closed, for example, even if the flame runs up to the gas mixing device 5, the flame will not continue to burn for a very long time. This is because the acetylene gas supply device 10 is closed by the valve 13, so that no acetylene gas is supplied.

The invention can improve the stability of the working parameters of the spraying stage.

INDUSTRIAL APPLICABILITY The present invention is an explosive type device used for processing a large number of batched workpieces in a large assembly type production line such as the automobile manufacturing industry, or an explosive type device incorporating the same. It is most useful when applied to equipment.