JPS62152558A - Gas explosion coating apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an industrial explosion bonding method, and more particularly to a gas explosion coating device.

Traditional coatings include metals, kelmet alloys, ceramics, wear-resistant steels, heat-resistant steels, and other coatings on parts of a variety of machines and equipment.

(Prior Art) In general, various explosive mixtures are used in industrial explosive bonding.Among the flammable gases, acetylene is particularly dangerous because the acetylene-air mixture is highly explosive. be.

Furthermore, it is easy to explode even in the absence of air, and
It has the disadvantage that it is more expensive than flammable gases such as natural gas and general gas (propane-butane gas).

On the other hand, broban-butane gas is suitable for use in this explosive bonding method because it is not as highly explosive as the aforementioned acetylene gas and is inexpensive.

However, in the case of propane-butane gas, the explosion delay time (transition period from ignition to explosion) is required to be quite long, several times the inner diameter of the barrel, and 10 times longer than the conventional acetylene-air mixed gas. A barrel length that is between twice and 100 times is required.

Therefore, when changing the gas used from acetylene gas to another less explosive gas, a special i-position is required to accelerate the transition process from ignition to explosion, and this transition process of explosion delay can be shortened. Otherwise, problems such as the length of the device, reduced capacity, and increased consumption of gas will arise.

A prior art gas explosion coating device, as shown in US Pat. No. 3,150,828, for example, has a barrel disposed within a casing, and a spark plug communicating with the barrel via a main pipe. Powder injection 04 into this barrel
A buffer unit with a gas conduit is provided, and this buffer unit is connected to the barrel via a communication tube, and has a gas supply device connected to the gas conduit of the loose chamber.

However, the amount of mixed gas of propane-butane and air to be supplied is affected by the length of the explosion delay period, and since this cannot be shortened, a large amount is consumed.

In addition, the high gas consumption and explosion delay period lengthen the operating cycle, resulting in a reduction in detonability and thus in capacity.

Furthermore, due to the long combustion delay period from ignition to explosion,
There are disadvantages such as a longer barrel.

C. Problems to be Solved] The present invention provides an apparatus that eliminates the above-mentioned drawbacks, reduces gas consumption, and makes it possible to increase performance.

[Means to solve]

In order to solve the above problems, the present invention has the following configuration.

A barrel is placed inside the casing, an ignition plug communicating with the main pipe is attached to the barrel, a powder injection pipe is inserted into the barrel, a buffer unit equipped with a gas pipe is provided, and this buffer unit is connected to the communication pipe. This is a gas coating device that is connected to the barrel through a gas supply unit and has a gas supply unit that is connected to the gas conduit of this buffer unit, and includes a gas heating device attached to the barrel and a gas heating adjustment device provided at the end of the barrel. It is characterized by having the following.

In order to increase the effectiveness of the gas heating device for the purpose of reducing the amount of gas consumed and shortening the explosion delay period described above, an annular groove is provided on the inner surface of the cover that covers the barrel inlet and/or barrel end, and a buffer chamber is also provided. The connecting pipe with the main pipe is an insulated pipe.

Furthermore, since there is a difference in thermal expansion between the barrel and casing during gas heating, an adjustment device is placed at the tip of the barrel.

With the above configuration, the explosion delay period can be shortened, so gas consumption can be reduced and the device capacity can be increased.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

The explosion coating device has a barrel 2 built into a casing 1, and an annular groove 4 is cut into the inner peripheral surface of an inlet portion 3 of the barrel 2. Inlet part 3 of this barrel 2
A main pipe 5 is inserted in the same way, and an annular groove 6 is formed on the inner surface of the main pipe 5.
is formed.

Further, a spark plug 7 is attached to the entrance of the main pipe 5. A cover 9 is attached to the end 8 of the barrel 2, and an annular groove 10 is formed on the inner surface of the cover 9, that is, at a position facing the opening [1] of the end of the barrel 2.

This cover 9 is integrally formed at the front end of the casing 11 of the buffer unit 12.

Spiral gas conduits 13 and 14 are built into the casing 11, and these gases 311 are connected to the barrel 2 through communication pipes 15 and 16, which are covered on the outside by heat-insulating pipes 17 and 18, respectively.

A gas heating adjustment device 19 is formed by the side plate 11a of the casing 11 and the cover 9, and the cover 9 is provided with cooling water passages 20 and 21.

The injection tube 22 of the powder injector 23 is inserted into the barrel 2 through the opening of the cover 9 and the end 8. Furthermore, an expansion absorption device 25 is located near the powder injection port 24 of the barrel 2.
is provided to absorb thermal expansion of the barrel 2 relative to the casing 1 during heating.

The thermal expansion absorber 25 is attached to the barrel side and includes a bushing 26, a gasket 27, a disk 28, and a gasket 2.
9, a disk 30 and a nut 31.

The gas conduits 13 and 14 are gas supply pipes 33 and 34.
are respectively connected to the gas supply device 32 via.

The powder injector 23 is connected to a control device 35 via a cooling pipe 36 for the flow of cooling water.

The explosion coating equipment is equipped with a cooling water supply system.
This supply system is composed of a cooling water supply pipe 38 incorporating a cooling water valve 37, a cooling pipe 39, and a cooling pipe 40 which are interconnected. The cooling water supply pipe 38 is connected to the casing 11 of the buffer unit 12, the cooling pipe 39 connects the inner space of the casing 11 and the barrel casing 1, and the cooling pipe 40 connects the inner space of the barrel casing 1 with the cooling water. The cooling pipe 41 communicates with the cooling water passage 20.
and the powder injection OA device 23 are connected. Rough cooling pipe 3
6 communicates the powder injector 23 and the flow a control device 35.

The cooling water discharged from the barrel casing 1 is passed through the cooling pipe 4.
0, the water that was connected to the cooling water passage 21 bored in the cover 9 is also discharged from the cooling water passage 20, and the cooling water pipe 4
1 to the powder injector 23, and further connected to the cooling pipe 36.
It is connected to a cooling water flow control device 35 via.

[Effect]

The operation of the explosion coating apparatus according to the present invention will be explained below.

In preparation for startup, the cooling water valve 37 is opened and the cooling pipe 3 is opened.
8.39.40. Cooling water is supplied into 41 and 36, and the gap J3 between the casing 1 and the barrel 2 and the space between the casing 11 and the cover 9 are filled with cooling water. The drain is drained through the flow rate control device 35.

Then, the gas supply device 32 is activated and starts operating, and all gas lines, ie, inside the barrel 2, the main pipe 5, the gas supply pipes 33 and 34. The filling cycle is completed by filling the gas conduits 13 and 14 and the connecting pipes 15 and 16 with gas, after which the spark plug is ignited. The explosive gas instantaneously heats the inner circumferential wall of the barrel 2 and the annular grooves 4, 6 and 10.

The present invention is characterized in that the explosive gas is heated in two stages. That is, in the first stage, the connecting pipe 1
5 and 16, and then passed through the heat insulated pipes 17 and 18.
holds.

The second stage is heated in the barrel 2 and partly in the main pipe 5. As is clear from FIGS. 3 to 5, annular grooves 4, 6, and 10 are formed in the inlet portion 3 of the barrel, the main pipe 5, and the cover 9 disposed at the end of the barrel 2, respectively. These have the effect of increasing the heat exchange area and promoting turbulent heat exchange, thereby improving the heat exchange efficiency.

Since the detonation gas is heated almost to its autoignition temperature, high temperature heating and formation of a cold flame zone are facilitated, and the explosion delay period is considerably shortened.

Furthermore, the grooves 4, 10 and 6 have the advantage of increasing the heating of the gas mixture, imparting impingement turbulence to the gas mixture and accelerating the flame speed.

The mixed gas that is reversed after hitting these grooves is sufficiently heated and includes a cold flame range, so it instantly reaches the autoignition temperature before reaching the edge of the bulge, creating a state where it is easy to explode. . A number of rflli/1.10.6 are placed around the barrel 2 to act as ignition sources and accelerate the combustion rate.

If we also consider the preheating of the mixed gas that diffuses in turbulent flow,
The explosion delay period can be dramatically shortened, making it an extremely good explosive device.

According to the present invention, since the contact surface with the explosive gas is kept at a high temperature, it is possible to suppress the condensation of water vapor contained in the explosive gas, and the powder is prevented from sticking to the wall surface of the barrel 2 and the powder is ejected. Blockage of the opening 22 can be prevented.

Furthermore, by keeping the inlet temperature of the cold water supply valve 37 at 20°C, the gas conduits 13 and 14 can be reliably cooled.
In addition, backflow to the gas supply device 32 can also be prevented.

When the cooling water passes through the gas heating adjustment device 19,
The inner surface 10 of the cover 9 is kept at a high temperature.

The cooling water flow m ff, III device 35 controls the cooling water system, and also controls the temperature of the gas by changing the inner surface temperature of the cover 9 and also the cooling water temperature.

The gas heating here is at the same time as the temperature of the barrel 2, and the temperature difference between the casing 1 and the barrel 2 causes a difference in expansion due to their heat, but as in the present invention, the thermal expansion absorber i!
? If the gasket 29 of :25 is slidably arranged with respect to the casing 1, damage to the barrel 2 can be prevented.

〔Effect of the invention〕

The present invention can greatly reduce the risk of explosion. Furthermore, the capacity of the detonation device can be increased with a relatively simple and inexpensive device using commercially available inexpensive gases, and various economic effects can be brought about in the production of new products and the repair of defective products.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the gas explosion coating apparatus according to the present invention, and FIG. 2 is a plan view of the same apparatus.
3 is a detailed view of section B in FIG. 1, FIG. 4 is a detailed view of section 0, and FIG. 5 is a detailed view of section D. 1... Casing, 2... Barrel, 3... Barrel inlet, 4.6.10... Groove, 5... Main pipe, 7...
・Spark plug, 9...Cover, 11...Casing, 1
2...Ml! li unit, 13... gas conduit, 1
4... Gas conduit, 15. 16... Communication pipe, 19... Gas heating adjustment device, 22
...+IC, 10J pipe, 23...powder injector, 25
...Thermal expansion absorber, 32...Gas supply device, 35
...Cooling water control device, 36.37...Cooling water supply device, 38.39.40°41.36...Cooling pipe.

Claims (1)

[Claims] 1. A buffer unit including a barrel disposed within a casing, an ignition plug communicating with the barrel via a main pipe, a powder injection pipe inserted into the barrel, and a gas conduit. The buffer unit is connected to the barrel via a communication pipe, and the gas explosion coating apparatus has a gas supply device connected to the gas conduit of the buffer unit, the gas heating device attached to the barrel and the end of the barrel 1. A gas explosion coating apparatus, comprising: a gas heating adjustment device provided at a gas heating adjustment device. 2. The first aspect of the present invention is characterized in that the gas heating control device is constituted by an annular groove carved in the inner peripheral surface of the inlet of the barrel and the inner surface of a cover that covers the end of the barrel. Gas explosion coating equipment as described in Section. 3. The explosion caused by the gas according to claim 2, wherein the gas heating device is constituted by a heat insulating pipe covered around a communication pipe that communicates the buffer unit and the barrel. Coating equipment. 4. The gas explosion coating according to claim 1 or 2, characterized in that an annular groove is provided on the inner surface of the main pipe interposed between the ignition plug and the barrel. Device. 5. The gas explosion bonding device according to claim 1, wherein a device is installed at the tip of the barrel to absorb a difference in thermal expansion between the casing and the barrel caused by gas heating. Coating equipment.