JPS6056542B2 - explosive coating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for applying a coating to the surface of an article by spraying a coating, in particular an explosive coating apparatus.

The invention can be applied in the shipbuilding and aircraft industry, aerospace technology, mechanical technology and metrology technology for the production of parts that are subjected to high loads during operation and are also subject to corrosion and thermal wear. There are some difficulties associated with producing coatings of desired thickness with detonation wave coating techniques, and these difficulties make precise powder batch metering with the batch scales used in known coating equipment impractical. It is extremely difficult to directly measure the thickness of the coating when using this technique, since this is not possible to achieve and the measuring equipment is directly affected by the strong dynamic and thermal effects generated by the pulsating flow of gold powder particles. There are certain points.

In the case of most conventional explosive cladding devices, which typically have an explosion chamber and a detonator constructed in the shape of a barrel and communicating with a powder supply system and a mixed gas supply system, the amount of cladding powder at the exit of the explosion chamber is controlled. No. 2,950,867 and 3,773;
(See Intestine 25).

Recently developed devices include the above devices, batch meter valves integrated into the powder supply system, mixer valves integrated into the mixed gas supply system, and conventional control devices for actuating the detonator (as described above). A separate powder detector (omitted here) is provided, which is adapted to indicate the amount of powder in the explosion products, via a feedback circuit with an amplifier (powder detection signal converter). The detector, together with the amplifier and the control device, constitutes a control system for monitoring the operation of the device (pending application filed March 28, 1979 under the name ``Apparatus for Explosive Painting''). (See Japanese Patent Application No. 36,779/1979).
A powder detector determines the brightness of the explosion products exiting the barrel during operation of the device. This brightness depends on the amount of powder coating material contained in the explosion product and is proportional to this. The signal from the powder detector is sent via an amplifier to a control device, where, if the level of this signal decreases, a command signal is formed to increase the amount of powder sent from the batch meter of the powder supply system to the explosion chamber. be done.

If the powder is not present in the explosion products (not detected), the control device shuts down the entire system of the device. However, even if a powder detector is provided to indicate the amount of powder in the explosion products, this detector will in principle only detect deviations from the predetermined amount of explosion products due to a single shot, so the above-mentioned With this device, it is not possible to form a coating to an exact thickness.

Therefore, the resulting coating is generally thicker than necessary, and the parts thus coated require mechanical treatment.

Other methods of applying a coating of a predetermined thickness will reduce the length of the shot. The coating is applied in successive shots, and the thickness of the coating being formed is measured after each such successive shot. In either case, the labor consumption increases while the efficiency of the coating process decreases. The present invention aims to obviate the above-mentioned drawbacks.

It is an object of the present invention to provide an explosive coating apparatus which further improves the efficiency of the coating process by providing a novel device in the apparatus control system feedback circuit which provides precise control of the thickness of the coating being formed. It's about getting. This object of the invention is achieved by providing an explosive cladding device having an explosion chamber and connected thereto a powder supply system, a mixed gas supply system and an initiator.

The powder feed system includes a batch meter that meters out the powder that is being delivered to the explosion chamber. The mixed gas supply system includes a gas mixer that communicates with the gas source through a valve. The device of the invention further includes a control device for actuating the valves of the batch meter and mixer and for actuating the detonator, the control device being adapted to determine the amount of powder contained in the explosive product. electrically connected to the powder detector via an amplifier. According to the invention, this electrical connection is carried out through a coating thickness measuring device which has a predetermined thickness setting device, an analog-to-digital converter, an adder and a comparison device. One of the inputs of the comparison device is connected to the output of the coating thickness setting device, and the input is connected via a key to the control device. The aim of the invention is to obtain a device for explosive coating, in which a high efficiency of spray coating is ensured.

In accordance with the above and other objects of the invention, there is provided a powder supply system including an explosion chamber and a batch meter leading to the explosion chamber and a gas source at the inlet through a valve and at the discharge end passing to the explosion chamber. a mixed gas supply system having a mixer, a detonator connected to the explosion chamber, a control device electrically connected to the batch meter and the valve of the mixer and the detonator;
It has a powder detector electrically connected to a control device through an amplifier and a coating thickness measuring device to indicate the amount of powder in the explosion product, and the coating thickness measuring device has a coating thickness setting device and an analog/digital It has a series circuit including a converter, an adder and a comparator, the analog-to-digital converter having an input connected to the output of the amplifier, and the comparator having one of its inputs connected to the output of the coating thickness setting device. An explosive cladding device is obtained whose output is connected to a control device via a key. Controlling the coating thickness during coating by providing a coating thickness measuring device in the feedback circuit connecting a powder detector for detecting the amount of powder in the explosive product to the control device of the device; It becomes possible to stop coating formation when the desired thickness is achieved.

As a result, the formed coating does not require extra processing to bring its thickness to the required thickness, and the equipment does not have to be stopped during operation to measure the thickness of the coating being formed, thus reducing the labor consumption of the process. is reduced and its efficiency is increased. Next, embodiments of the present invention will be explained with reference to the accompanying drawings. Ru. The device for explosive covering includes an explosion chamber 1 made in the form of a cylindrical barrel closed at one end thereof and an initiator 2 in the form of a spark plug fixed inside the barrel, connected to the explosion chamber 1. It has a mixed gas supply system and a powder supply system 4.

The mixed gas supply system 3 includes a gas mixer 5 for producing a mixed gas from a combustion gas (eg acetylene), an oxidizing agent (eg oxygen) and an inert gas (eg nitrogen). These gas sources 6, 7 and 8 are connected to valve 12
, 13 and 14 are connected to the mixer 5 via vibrating lines 9, 10 and 11. The mixer 5 communicates with the explosion chamber through a coiled vibrator 15 adapted to suppress reverse surges. The powder supply system 4 includes a batch meter 16 into which the coating powder is fed from above.

The inlet 17 of this batch meter is adapted to convey carrier gas, and its outlet 18 communicates with the explosion chamber 1 via a feed vibrator 19. Through a gas supply vibrating line 20 connected to the inlet 17, the batch meter 16 communicates with a source of carrier gas, in this case a source 8 of inert gas. According to the invention, an ordinary pulse feeder (see USSR Inventor's Certificate No. 523,846, International Classification B65C5314O, 19) is used as a batch meter, but any other suitable device in the art can be used for the above purpose. Feeders known in the art may also be used.

A valve 21 is mounted on the gas delivery vibe 20 at the inlet 17 to control the delivery of carrier gas to the batch meter 16.

The control system provided in this device includes the valve 12 of the gas mixer 5 through the control circuits 23 and 24.
13 and 14, there is a control device 22 whose outputs are electrically connected to the valve 21 of the batch meter 16 via a control circuit 25 and to the detonator via a control circuit 26, respectively.

The control device 22 includes a pulse shaper 27 and a binary evolution w
It has a base counter 28, a decoder 29, a program setting device 30, and an amplifier 31. The control system further includes a powder detector 32 adapted to determine the amount of powder in the explosion products, which powder detector 32 is electrically connected to the control device 22 via a feedback circuit 33. ing.

The powder detector 32 is constructed in the form of a photodiode that is sensitive to the radiated light and heat generated by the detonation products. Other devices such as photoresistors can also be used instead of photodiodes. The feedback circuit 33 includes an amplifier 34 whose input is connected to the powder detector 32;
There is a coating thickness measuring device 35 whose input is connected to the output of the control device 22 and whose output is connected to the control device 22 .

The amplifier 34 has a series circuit including a voltage amplifier, a first power amplifier, an integrating RC circuit, and a second power amplifier (not shown).

The coating thickness measuring device 35 includes a coating thickness setting device 36 and a series circuit consisting of an analog-to-digital converter 37, an adder 38 and a comparator 39.

Coating thickness setting device 36 is a w-adic wafer switch device that includes a plurality of separate wafer switches that encode a number indicating the desired thickness of the coating being formed. An analog-to-digital converter is placed at the input of the coating thickness measuring device 35, and an analog signal from the powder detector 32 (this signal from the output of the amplifier 34 is connected to the input of the analog-to-digital converter in the form of an alternating voltage E). ) is converted into a digital code at the moment when the brightness of the powder in the explosion product of a single shot is at its maximum.

The adder 38 is for adding numbers determining the thickness of a coating formed in one shot; these numbers are transmitted from the analog-to-digital converter 37 to the adder in the form of a digital code. be done.

One input of the comparator circuit 39 is connected to the output of the setting device 36, and the other input is connected to the output of the adder 38, which provides a command signal to the device as soon as the predetermined thickness of the coating being applied is obtained. stop. The output of the device 39 is connected to the control device 22 via a key 40, which is made in the form of a relay with a backbrake contact in a circuit 41 that applies the supply voltage to the control device 22. The working of the proposed device for this explosive coating is as follows.

When pushbutton 1 of the control panel (not shown) is pressed, supply voltage is applied to the control device 22 through the key 40 of the device 35.

Shaper 27 generates rectangular pulses which are applied to a binary coded W-adic counter 28 which converts the serial number of each arriving pulse within the device operating cycle into a binary coded decimal code. In the decoder 29, these pulses are distributed in the usual manner and a potential is generated at the pair of outputs corresponding to the code of the respective arriving pulse.
A program setting device made in the form of a decimal switch selects the required pulses by the program and these are transmitted to the control circuits 23, 26 via an amplifier 31 and the valves 12 to 1 of the gas mixer 5 are activated. The valve 21 of the batch meter 16 and the detonator 2 are activated.

First, a command signal is generated by the device 22, in response to which the valves 12, 13 open to cause combustion gases and oxidizing gases to be delivered from the source to the gas mixer 5 via the vibration lines 9, 10; A command signal is transmitted from control device 22 to circuit 24 to open 14.

The inert gas from the source 8 flows through the vibrator line 11 into the mixer 5 where all three components of the gas mixture are mixed together and this gas mixture is sent to the explosion chamber 1 through the coiled vibrator 15. It will be done. When the explosion chamber 1 is filled with this gas mixture, a command signal is sent to open the valve 21. is sent via circuit 25 to the device 22 output. The valve 21 is held in the open position for a period of time, the length of which is determined by the length of the pulses generated by the pulse shaper 27, to deliver inert gas from the source 8 to the batch meter 16 for coating. The J material powder is injected into the explosion chamber 1 through the feed vibrator 19. After the explosion chamber 1 is filled with the mixed gas and powder, a command signal is sent from the control device 22 to the control circuit 23 to close the valves 12 and 13 on the combustion gas and oxidizing gas vibe lines 9 and 10, respectively. It will be done. Since the valve 14 is still open, the inert gas is subsequently pumped into the mixer 5, cleaning the mixer and the cavity of the coiled vibrator 15. Simultaneously with the command signal to close the valve 14, a signal sent from the device 22 via the control circuit 26 ignites the spark plug to cause an explosion in the explosion chamber 1. Explosion chamber 1 where coating powder is placed on the explosion product
and is deposited on a target part 42 positioned on the path of movement of the detonation products. When other conditions are held constant (these are constant when forming the same coating)
Since the brightness of the explosion product stream depends on the amount of powder coating material contained in the explosion product, the powder detector 32 detects the maximum brightness of the explosion stream during one shot. The signal generated is proportional to the amount of powder, which varies from shot to shot due to inaccuracies in powder metering by the powder batch meter 16. The signal from the powder detector 32 is sent to an amplifier 34 where it is first voltage amplified and then power amplified. The analog-to-digital converter 37 of the coating thickness measuring device 35 converts the signal arriving at its input from the output of the device 36 into a digital code, which signal is then applied to the input of an adder 38 and converted from the converter 37 by the adder. By adding up the signals that arrive one after the other, the thickness of the coating being formed is determined. The signal from the adder 38 is compared in a comparator 39 with a predetermined thickness of the coating being applied, the magnitude of which is stored in the memory of the setting device 36. If, after successive shots, the compared values match or the signal from the acidifier exceeds a predetermined value (within tolerance limits), the device 39 issues a signal in response to which the relay at key 40 is activated. The back contact is opened, cutting off the voltage supply to the control device 22 and shutting down the device. When the stored value in the memory of the adder 38 is erased, the device becomes operational again.

The coating process in the proposed device is therefore fully automated, guaranteeing high operational precision, efficiency and safety.

Although the preferred embodiments of the present invention have been described above, various modifications will be obvious to those skilled in the art, and therefore modifications can be made within the spirit and scope of the present invention as defined in the claims. .

[Brief explanation of the drawing]

The accompanying drawing is a schematic representation of the entire proposed device for explosive coatings according to the invention. 1: Explosion chamber, 2: Detonator, 3: Mixed gas supply system, 4
: Powder supply system, 5: Mixer, 6, 7, 8: Gas source, 1
2, 13, 14: Mixer valve, 16: Batch measurer, 21: Batch measurer valve, 22: Control device, 32: Powder detector, 34: Amplifier, 35: Coating thickness measuring device, 36: Coating Thickness setting device, 37: Analog
Digital converter, 38: Adder, 39: Comparator, 4
0: key.

Claims (1)

[Claims] 1 explosion chamber 1, powder supply system 4 with batch meter 16 and gas sources 6, 7 via valves 12, 13, 14;
, 8 , both of which are connected to the explosion chamber 1 , and a starting device 2 and a batch meter 16 . and a control device 22 electrically connected to the valves 21, 12, 13, 14 of the mixer 5 and a powder detector 32 for actuating the detonator 2 and for indicating the amount of powder in the explosion product. The electrical connection of the control device 22 to the powder detector 32 for indicating the amount of powder in the explosive products comprises
It is carried out through a coating thickness measuring device 35 which is provided with a coating thickness setting device 36 and a series circuit, said series circuit including an analog-to-digital converter 37, an adder 38 and a comparator device 39, the analog-to-digital converter 37 The comparator device 39 has its input connected to the output of the amplifier 34 , and the comparator device 39 has one of its inputs connected to the output of the coating thickness setting device 36 and its output connected to the control device 22 via the key 40 . An explosive coating device characterized by: