JPH03502778A - Device that conveys powder to the drum of gas detonation equipment - 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] FIELD OF THE INVENTION Apparatus for conveying powder to the drum of a gas fan apparatus The present invention generally relates to an apparatus for applying powder coatings by gas fanning. In particular, the background of the invention of the gas fan device Equipment that applies powder coatings using the gas fanning method deposits a certain amount of powder at a set point. This is an important element for transporting the ram to a predetermined location. meet these conditions The important thing is the quality of the film, such as the stability of the film, the adhesion strength between the film and the base material surface, and The porosity of the coating is often determined.

Into the drum of a gas instigator, which is filled with an explosive gas mixture at one end. Powder is introduced and then agitation is started in the drum. High temperature of stirring product The flow accelerates and heats the powder particles, causing these particles to ii ! Thermal spray is applied to the surface of the base material. Powder used in gas fanning equipment The final weighing feed means must have a quick response, a long service life, and a weighing capacity of 1 Ikr 1 degree. Its housing against the advance of bank fires and explosive gas mixtures. The purpose is to protect.

Powder as a method of feeding powder into a device that applies a film by gas fanning End-weigh feeding means are classified into pneumatic means and mechanical means. Pneumatic powder weighing feed In the means, the powder is conveyed by pulses of compressed air. But like this In a suitable powder weighing and feeding means, the amount of entrained gas exceeds the amount of powder, and this amount of powder As the powder particles are introduced into the drum, the powder particles form an elongated mist inside the drum. Due to the axial spread, it is not possible to send the powder to a specific part of the drum; Generally, a non-combustible gas such as nitrogen is used as the powder carrier gas, and this gas This process dilutes the explosive gas mixture in the drum in the inlet area. It creates instability and also deteriorates the properties of the stirred product. Also, the agitation process under conditions that do not allow even the slightest dilution of the explosive mixture by non-combustible gases. be. Under these conditions, the powder is removed by mechanical means, such as screws, packets, etc. Powder is weighed and transported by a belt conveyor or worm mechanism. The entry means is prone to severe wear and blockage, and has a short lifespan.

Therefore, in order to obtain a high-quality film, the length of the powder mist in the axial direction of the drum must be minimized. It is necessary to limit i.e. powder particles introduced into the drum through the introduction opening of the drum. The initial position of the powder particles in the axial direction of the drum is the same as before stirring. In an elongated mist of powder particles, which is preferably Since the initial position changes, the interaction time with the agitation product changes, resulting in the The properties of the film obtained by this gas fanning process vary in speed and heating temperature. becomes unstable.

Additionally, the powder metering delivery means must ensure a uniform distribution of powder particles in the mist. There should be no uneven distribution.

Non-uniformity in the thickness of the film applied to the surface of the base material, and differences in thickness, adhesion, and stiffness from the film. This results in the appearance of spots with conglomeration and porosity.

Prior art powder weighing delivery means effectively introduce powder into the drum. ° Scratches and gas fanning reduce the efficiency of the coating application equipment.

A known device ( (See Soviet Patent No. 582,004).

It is most similar to the device according to the invention. Placed directly on this prior art ram powder weighing feeder with a weighing cavity and a valve at its bottom. including steps.

The movement of the rond is caused by a pulse of compressed gas acting on a piston connected to the rond. The piston is placed on a sleeve to limit its stroke. be placed. During the Rondo movement, the valve enters the drum and the piston hits the sleeve. During the impact, powder is dispersed inside the drum.

The powder particles introduced into the drum form an elongated mist in the axial direction of the drum, and As mentioned above, this causes non-uniformity of film properties. Furthermore, this powder weighing feeding means The powder is introduced in bulk, and as the stiff mass interacts with the agitated product stream, it is transferred to the drum. Non-uniform coating thickness because the powder particles are not converted into a mist evenly dispersed in the occurs.

Another disadvantage of this prior art is that the time required to charge the powder into the drum is The response time is determined by the time it takes to move the powder to the cavity and fill the powder into the cavity. The answer is late.

Another disadvantage of this structure is that the part that communicates the inside of the powder weighing feed means with the inside of the drum is The interior of the powder weighing feed means is exposed to an explosive gas mixture through a partially opened channel. It could become filled and cause an explosion.

Summary of the invention The object of the present invention is to convey powder to the drum of a device for applying a film by agitation. In equipment, minimize the length of the powder mist as it is introduced into the drum. to ensure uniform distribution of powder particles in the mist and when conveying the powder into the drum. The purpose of this invention is to provide a device that can shorten the time required.

An object of the present invention is to provide a device for conveying powder to a drum of a gas fanning device. , the housing includes a drum of a gas fan passing through the housing. and means for metering in the powder to be sealed, the device comprising: a drive; The shoulder side member is rigidly attached to the housing, and the middle member is this member. The powder weighing device is provided with a drive means for reciprocating the powder along the axis of the drum. A feeding means is housed in an area where the movable means and the fixed member are interconnected, and the feeding means The bottom of the housing below the weighing feed means and the drum forms a powder collection chamber; This chamber is configured to include a mechanism for returning the powder to the powder weighing delivery means. This is accomplished by means of a device that conveys the powder to the drum of the fanning device.

This structure allows the powder to be guided locally in the drum, i.e. It can ensure the same cutting position of the powder and uniform distribution of the powder throughout the inside of the draft. . This is carried out from the hopper at the joint separating the fixed member and the movable member from each other. The curtain of powder that is continuously conveyed to the joints of these parts passes through this gap to the drum. This is because the inside is filled.

The time to fill the drum with powder depends on the falling distance of the powder particles in the mist determined by the speed and the distance from the discharge hole of the powder weighing means to the drum introduction opening. determined. By changing this distance, the filling time of the drum with powder and thus The operating efficiency of the device can be controlled.

In this structure, the powder is transported from the powder weighing and feeding means to the Mth part of the drum member. A continuous and uniform flow of powder is ensured by a mechanism that returns the powder to the powder metering feed means.

In a preferred embodiment of the present invention, the movable member driving means includes a movable member and a fixed part. materials are stored in other areas that are interconnected and are affixed to the ends of the movable and fixed members. and a sealed annular chamber disposed coaxially with the drum; The shaped chamber is connected to an overpressure source, the walls of the housing and the movable member and the flexible membrane One end of this membrane is fixed to the housing and the other end is attached to the movable member. It's stuck.

The advantage of this construction is that the drive means are located at the end of the drum member, just inside the drum. The object of the present invention is to enable reciprocating motion of the drum member without increasing the size of the device.

According to another preferred embodiment of the invention, the area of the drive means of the movable member is An annular ring disposed on the outer cylindrical surface of the joint portion of the fixed member that engages with the inner surface of the moving member. Equipped with grouped labyrinth seals.

This construction prevents the escape of explosive mixtures and agitation products into the interior of the housing.

In a preferred embodiment of the invention, one of the side walls of the powder weighing feed means has a housing. The discharge width of the slot of the powder weighing feeding means can be adjusted. .

The above structure regulates the amount of powder introduced into the drum and also controls the amount of powder in the powder stream. Uniform distribution of particles can be guaranteed.

Preferably, the wall of the housing has a passage connecting to a source of overpressure internal to the housing. have This structure is used when the drum is filled with explosive gas and the explosion is started. The inside of the housing is filled with gas under overpressure, and the inside of the housing is filled with gas. This can prevent explosive mixtures from entering and destroy the equipment.

Brief description of the drawing Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. In the attached figure, FIG. 1 shows a longitudinal section of the device of the present invention for conveying powder to the drum of a gas fanning device; Figure 2 is a tIR plane view along the II-II line of Figure m1, and Figure 3 is the circle of Figure 1!1. It is an enlarged view of shape A.

BEST WAY OF CARRYING OUT THE INVENTION The structure that transports the powder to the drum of the device that applies the film by gas fanning is the housing. drum 2 (only a part of which is shown in Figure 1) of the gas fan device. ) passes through the housing 1. Fixing member 3 relative to housing 1. 4 are connected to each other, and a movable member 5 is fitted between these fixed members. ．． 4.5 is arranged coaxially with the drum 2 and forms part of the drum 2 with a passage 6; Inside the housing On one side, means 7 with a shaker 8 for metering the powder to be sprayed are arranged. ing. of the housing 1 below the said powder weighing feed means 7 and the passage 6 of the drum 2. The bottom part forms a powder collection chamber 9, from which a packet, e.g. A lifting mechanism in the form of a conveyor 10 conveys the powder to said weighing feed means 7. (Figure 1).

The movable member 5 is provided with a drive means 11 for reciprocating the movable member 5, and this drive means is movable. A compression spring 12 fixed to the ends of the member 5 and the fixed member 3 and coaxial with the drum 2. a sealed chamber 13, the walls of which are formed on the outer surface of the housing 1. and a flexible membrane 14, one end of which is connected to the housing 1. The other end is fixed to the movable member 5. The chamber 13 has a passage 16 and a tube. 15 to an overpressure source (not shown) and a control valve 17 such as a solenoid valve. Ru. The valve 17 periodically opens and closes the introduction passage 16 of the chamber 13 . The interior is communicated via pipe 15 with a source of overpressure or with the atmosphere.

The joint “A” between the fixed member 3 and the movable member 5 (FIGS. 1 and 3) is the joint “A” between the fixed member 3 and the movable member 5. The cylindrical outer surface of the fixing member 3 engages with the inner surface with a play of 0.1-0.2 mm. is sealed by a labyrinth seal 18 in the form of an annular group 19 of. This sea The tube 18 prevents the leakage of explosive mixtures and stirring products from the passage 6 of the drum 2. The powder weighing feed means 7 is located inside the housing 1 with respect to the fixing member 3. It is defined by one wall body 20 (FIG. 2) and a fourth movable wall body 21, and this movable wall The body 21 is pivotally connected to the housing by a pin 22 and is co-located with the wall 20 of the housing 1. At t!, the powder is conveyed to drum 2. Forms the slit hole 23 (Fig. 1) that can be controlled. .

Furthermore, the wall of the housing 1 below the drum 2 is provided with a passage 24, which passage is The interior of the housing 1 is communicated with an overpressure source so that the explosive gas mixture is passed through the housing 1 to the step. This prevents the powder from entering the inside of the powder weighing feed means 7. A chamber 25 is provided, each chamber 25 having a passageway for collecting the powder. 26 and 27 communicate with the interior of the means 7 and with the atmosphere.

An adjusting ring 28 is attached to the housing 1, and this ring 28 is attached to the movable member 5. This is to limit the movement of the members 4 and 5, and to set the play between the members 4 and 5.

Structure of the present invention for conveying powder to a drum of a device for coating a film by gas fanning operates as follows.

The drum has a uniform flow rate of powder, corresponding to the agitation speed produced by this device. The time τ is set so as to completely occupy the inside of 2. This time is essentially CL /V is equal to o, where d is the inner diameter of drum 2, i! Vo is the entrance of drum 2 is the powder particle velocity of This powder particle velocity is above 6111ifi in drum 2. The ejection hole of the hand ff7 from the edge is equal to the lower Ti, where g is the free fall acceleration degree.

In the above structure, the drive device moves the member 5 within 5 to 7 ms. For example, assuming h = 50 m m, τ = 20 m s, the stirring skewer of this device is It can increase up to 20 shots per second, which increases the operating efficiency several times. Ru.

In this case, the base material to be applied (not shown) is placed at the open end of the drum 2.

In the initial position, the movable member 5 is pressed against the fixed member 4 by the spring 12. The powder continuously escapes from the metering feed means 7 through the slot 23 and into the member 4. The powder flows around the joint between It is returned to the final weighing amount feeding means 7. The result is a continuous uniform flow of powder. control valve When an electrical pulse is applied to 17, the pressure within chamber 13 increases.

is transmitted to the movable member 5 through the flexible y & 14, and this movable member moves to move the member 4 and 5 to allow the powder to enter the passages 6 of the drum 2.

In this way, the member 5 is moved from the member 4 towards the one-pitch ring 28, and the powder is removed from the powder. From the slot 23 of the end weighing feed means 7, through the gap formed, a uniform curtain is formed. It passes through the entire cross section of the passage 6.

When the solenoid valve 17 is released, the spring 12 returns the member 5 to its initial position and the driver Close the drum 2 and fill the inside of the passage 6 of the drum 2 with -2 amount of uniformly distributed powder. Cut. At the time of this drum 2 deadline, there are The agitation of the explosive mixture begins, and the agitation products entrain and accelerate the powder particles. , this is sprayed onto the base material.゛ Fanning from drum 2 through joint A of members 3 and 5 The discharge of the condensation products is prevented by the labyrinth seal 18 between the parts 4 and 5. The expulsion of explosive mixtures from inside the housing 1 through the This is prevented by maintaining overpressure in the area. Isolation of powder from inside housing 1 This is prevented by the powder collection chamber 25.

industrial use The present invention relates to mechanical components operating under conditions of abrasive or corrosive media and Heat resistance to the unit, a layer of heat resistance and a layer of heat resistance Leave it alone.

It can be used particularly effectively.

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Claims (1)

[Claims] 1. A device for conveying powder to the drum of a gas detonation device, which includes a housing (1), this housing passes through the drum (2) of the gas detonator. and means (7) for metering in the powder to be sprayed. comprises three members (3, 4, 5) defining a drum (2), with members (3, 4) on both sides is rigidly attached to the housing (1), and the intermediate member (5) aligns it with the axis of the drum (2). A driving means (11) for reciprocating along the powder weighing means ( 7) is housed in one area where the movable means and the fixed member are interconnected; The bottom of the housing (1) below the powder weighing feed means (7) and the drum (2) is It forms a collection chamber (9) which transfers the powder to the powder metering feed means (7). ) for a drum of a gas detonation device characterized by being equipped with a mechanism (10) for returning A device that transports powder. 2. The driving means (11) for the movable member (5) is such that the movable member and the fixed member are interconnected. Pressure is stored in another area and fixed to the ends of the movable member (5) and the fixed member (3). a compression spring (12) and a sealed annular chamber (13) arranged coaxially with the drum (2); said annular chamber is connected to a source of overpressure and is connected to a housing (1) and a movable part. It is formed by the wall of the material (5) and a flexible membrane (14), one end of which is It is fixed to the housing (1), and the other end is fixed to the movable member (5). 3. The device according to claim 2. 3. The area of the drive means (11) of the movable member (5) is located on the inner surface of said movable member (5). an annular groove arranged on the outer cylindrical surface of the joint part of the fixing member (3) that engages with the According to claim 2, further comprising a (19)-shaped labyrinth seal (18). equipment. 4. One of the side walls (21) of the powder weighing feed means (7) is pivotally attached to the housing (1). It is possible to adjust the discharge width of the slot (23) of the powder weighing feeding means (7). The device according to claim 1, characterized in that the device can 5. The wall of the housing (1) has an opening connecting the interior of the housing (1) to a source of overpressure. Device according to claim 1, characterized in that it has a channel (24).