JP2005074304A - Fluidized dip lining apparatus and fluidized dip lining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluidized dip lining apparatus and a fluidized dip lining method by which a desired film thickness is secured without repeating the preheating of an objective material to be lined with a resin and the performance deterioration of a lining material is suppressed to the minimum and the yield of lining powder is improved. <P>SOLUTION: The fluidized dip lining apparatus 100 is provided with a high frequency induction heating furnace 101 for housing the objective material 50 to be lined and heating with high frequency, a powder supply means provided with an injection port 23 for supplying the resin powder into the furnace and a powder fluidizing means composed of a porous ceramic member and including a floor plate having fine holes for supplying fluidizing fluid into the furnace. The objective material to be lined is preheated in the high frequency induction heating furnace and after being preheated, lined by dipping in the resin powder without being discharged to the outside of the furnace. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fluidized immersion lining apparatus and a fluidized immersion lining method for lining a plastic resin containing a fluororesin on the outer surface of a lining object.

  Conventionally, as a method for applying a resin lining to an outer surface of a lining object, that is, a resin lining object, an electrostatic powder coating method (for example, see Patent Document 1) or a fluid dipping method (for example, Patent Document 2). See).

  Here, when a thick resin lining is applied to the outer surface of the resin lining object, the electrostatic powder coating method first preheats the resin lining object in a firing furnace and preheats the lining object. An object was suspended in an electrostatic powder coating apparatus, and the outer surface was lined by electrostatic powder coating with a spray gun. In this case, since the film thickness of the lining by one coating is very thin, a predetermined film thickness is ensured by repeating preheating and coating.

  Also, in the fluid immersion method, as in the electrostatic powder coating method, the resin lining object is preheated in a baking furnace, and the preheated resin lining object is suspended in the furnace of the fluid immersion apparatus and sealed. Insert the resin lining powder into the furnace, feed air from the floor inside the furnace, flow the lining powder in the furnace, and put the lining powder on the outer surface of the preheated resin lining object. It was allowed to adhere and melt to form a predetermined lining film thickness. In this case, it is possible to make the film thickness thicker than the electrostatic powder coating method by one lining construction.

JP-A-11-179247

JP 2000-343013 A

  However, in the electrostatic powder coating of the conventional construction method, since the film thickness of the lining to the resin lining construction object is extremely thin, it is necessary to repeat preheating and painting many times to obtain a predetermined film thickness. Due to heat degradation of the lining material, it is difficult to obtain a stable film thickness due to spray painting by hand, and it is difficult to perform lining construction of large items, and due to repeated work of preheating work and spray painting There is a problem that work efficiency is extremely bad, such as a long construction time. Furthermore, the working environment is inferior due to the external scattering of the resin powder.

  In the fluid immersion method, the film thickness of the lining to the resin lining construction object can be thicker than that of the electrostatic powder coating method. However, in order to obtain a predetermined film thickness, it is necessary to repeat several times of preheating and lining construction. For this reason, performance deterioration due to the heat of the lining material occurs, poor work efficiency due to repeated work of installing preheated resin lining objects in the furnace of the fluidized immersion equipment, and lining due to repeated opening and closing of the equipment There were problems such as a decrease in the yield of the powder.

  The present invention has been made in view of such problems, and can ensure the required film thickness without preheating the resin lining construction object many times, and can minimize the deterioration of the performance of the lining material. And it aims at providing the fluid immersion lining apparatus and fluid immersion lining method which can improve the yield of lining powder.

  In order to achieve the above-described object, the fluid immersion lining apparatus of the present invention includes a high-frequency induction heating furnace that accommodates a lining object and heats it at high frequency, and a powder that supplies resin powder into the high-frequency induction heating furnace. It is characterized by comprising supply means and powder flow means for supplying a fluid for flow into the high-frequency induction heating furnace to flow the resin powder.

The furnace wall of the high-frequency induction heating furnace is preferably made of an inorganic material, and a part of the furnace wall is preferably made of a porous ceramic member that blows and supplies the fluid for flow into the furnace.
The furnace wall of the high frequency induction heating furnace has an inner cylinder, a floor plate, and an upper lid, and the powder supply means is an injection port that is formed on the upper lid or the inner cylinder and supplies the resin powder into the furnace. The powder flow means may be configured to have fine holes formed in the floor plate and supplying the fluid for flow into the furnace.
It is preferable that the apparatus further includes a fluid exhaust unit that is formed on the upper lid or the inner cylinder and has an exhaust port that exhausts the fluid to the outside of the furnace.
The flow fluid exhaust means includes a resin powder blocking filter provided so as to open and close an exhaust passage connected to the exhaust port, and a resin powder collection container provided downstream of the resin powder blocking filter; May be provided.
A fitting provided in the furnace of the high-frequency induction heating furnace and capable of detachably attaching a lining object, shaft means for rotatably supporting the fitting in the furnace, and the fitting outside the furnace It may further include driving means for rotationally driving. Alternatively, a suspension rod provided on the upper lid of the high-frequency induction heating furnace and suspending the object to be lined in the furnace, and driving means provided on the outer side of the upper lid and rotating the suspension rod. May be.

  In addition, the fluid immersion lining method for achieving the same object uses the fluid immersion lining apparatus described above to preheat the lining object in the high-frequency induction heating furnace, and after preheating, remove the lining object from the furnace. The lining is performed by immersing the resin powder in a resin powder without taking it out.

  According to the present invention, the necessary film thickness can be ensured without preheating the resin lining construction object many times, the performance deterioration of the lining material can be suppressed to a minimum, and the yield of the lining powder can be reduced. Can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view of a fluidized immersion lining device 100 according to Embodiment 1 of the present invention. The fluidized immersion lining apparatus 100 mainly includes a high-frequency induction heating furnace 101, a powder supply unit 102, and a powder flow unit 103. The high-frequency induction heating furnace 101 has a heat insulating material 2 and a high-frequency induction coil 3 inside the outer cylinder 1 on the outside, and a furnace wall 4 is provided inside the high-frequency induction coil 3.

  The furnace wall 4 has an inner cylinder 5, a floor plate 6, and an upper lid 7 each made of an inorganic material. As the inorganic material, a nonmagnetic material such as ceramic, glass or quartz is used. A rotary seat 8 is provided at the center of the inner cylinder 5, and a rotary shaft 9 is rotationally engaged about the horizontal axis in the rotary seat 8. 10 is provided. Further, during the lining construction, a resin lining construction object (lined substrate) 50 is attached to the fixture 10.

  The resin lining construction object 50 is an industrial part of various shapes, for example, an industrial machine part such as a pump, a valve, a semiconductor manufacturing apparatus part, a papermaking machine part, or a chemical plant part. In addition, according to the high frequency induction heating method, magnetic metal or the like is heated, but non-magnetic inorganic material or plastic resin cannot be heated. For this reason, the metal etc. which have magnetism and can endure heating temperature are employ | adopted for the material of these industrial machine parts.

  The rotating shaft 9 passes through the rotating seat 8 and protrudes toward the outer cylinder 1, and the protruding end portion is supported by being rotationally engaged with a support seat 12 provided on the support base 11. The rotary shaft 9 supported by the support seat 12 has a sprocket 13 attached to the end thereof, and is connected to a rotary drive machine 16 provided on the support base 11 via a chain or belt 14 and a drive transmission component such as the sprocket 15. It is connected.

  The floor board 6 is made of an inorganic material as described above, and is particularly made of a plate-like porous ceramic member. More specifically, the floor plate 6 is not only porous, but also has a plurality of fine holes through which a fluid for flow described later can penetrate from the lower surface to the upper surface and the flowing resin powder cannot pass. . Below the floor plate 6, a lattice-like floor plate support plate 17 is provided, and further below that, a hearth 18 that supports the entire high-frequency induction heating furnace 101 is provided. The hearth 18 is fixedly attached to the support base 11. A recess 18 a having a stepped portion is formed in the center portion of the hearth 18. The floor board support plate 17 is engaged with the step portion of the recess 18a, and the floor board 6 is supported by the floor board support plate 17 on the lower surface thereof. In addition, with such a configuration and arrangement, a gap portion 19 is formed in the center portion of the hearth 18 by the defining surface of the recess 18 a and the lower surface of the floor plate support plate 17.

  In addition, a blowing port 20 for blowing air or an inert gas as a fluid for flow is provided below the depression 18a in the hearth 18 and a blowing conduit 21 is connected to the blowing port 20 in the middle. Is provided with a dehumidifying heater 22.

  In the present embodiment, the above-described floor plate 6 and the fine holes formed thereon, the floor plate support plate 17, the recess 18a, the gap portion 19, the blowing port 20, and the blowing conduit 21 constitute powder flow means. In addition, this invention is not necessarily limited to the powder flow means including all the said components.

  An injection conduit 25 for injecting resin powder is attached to the upper portion of the inner cylinder 5 in the furnace wall 4 of the high frequency induction heating furnace 101. The inlet 23 that is the tip of the injection conduit 25 protrudes toward the furnace 101 a side of the inner cylinder 5. The inlet 23 is provided with a check valve 24 for preventing the resin powder in a fluid state from flowing back to the injection conduit 25. In the present embodiment, the powder supply means is constituted by the injection conduit 25, the check valve 24 and the injection port 23. In addition, this invention is not necessarily limited to the powder supply means including all the said components.

  In addition, an exhaust port 26 is provided on the upper side of the inner cylinder 5 on the side substantially opposite to the injection port 23. The exhaust port 26 is formed at the tip of an exhaust conduit 28 that penetrates the outer cylinder 1 and the inner cylinder 5 and defines an exhaust passage. A filter valve 31 including an exhaust filter 27 for blocking resin powder and a collection container 32 positioned downstream thereof are provided on the outer portion of the outer cylinder 1 in the exhaust conduit 28. The exhaust filter 27 operates to open and close the exhaust passage in accordance with the valve body opening / closing operation of the filter valve 31. That is, the exhaust filter 27 is disposed in the exhaust passage or removed from the exhaust passage. In the present embodiment, the above-described exhaust port 26, exhaust filter 27, exhaust conduit 28, filter valve 31, and recovery container 32 constitute a fluid exhaust means. Note that the present invention is not necessarily limited to the fact that the fluid exhaust means for flow includes all of the above components.

Next, an operation construction method of the fluidized immersion lining device 100 configured as described above will be described.
In order to accommodate the resin lining object 50, which is a magnetic material, in the furnace 101a of the high-frequency induction heating furnace 101, the upper lid 7 is opened. Thereby, the resin lining construction object 50 is inserted from the open part generated in the upper part and fixed to the fixture 10. In this state, the high-frequency induction heating furnace 101 is turned on, and the rotary lining machine 16 heats (preheats) the resin lining object 50 while rotating it at an optimum rotation speed. Here, the heating by the high frequency heats only the resin lining construction object 50 which is a magnetic material, the furnace wall 4 and the fixture 10 made of inorganic material are not heated, and the resin powder itself which will be described later is not heated. Moreover, in order to keep a lining construction target object at the fixed process temperature also during the following lining construction, the heating by a high frequency shall be performed suitably.

  When heated to a predetermined temperature, the air or inert gas heated and dried by the dehumidifying dryer 22 is blown into the gap portion 19 from the blowing port 20 through the blowing conduit 21. The air or the inert gas blown in this way is diffused in the entire lower surface of the floor board 6 through the gap portion 19, and is blown into the furnace 101a from the entire upper surface of the floor board 6 through the fine holes. At the same time, a resin powder (in this embodiment, a plastic resin powder containing a fluororesin) is injected through an injection conduit 25 and a check valve 24 from an injection port 23. The resin powder injected thereby becomes fluidized in the furnace 101a by air or inert gas ejected from the entire surface of the floor board 6. For this reason, a part of the flowing resin powder gradually adheres to the surface of the heated resin lining object 50, and the film thickness increases with time. That is, after preheating, lining is performed by immersing the lining object 50 in resin powder without taking it out of the furnace.

  At this time, since the resin lining object 50 is disposed near the center of the high-frequency induction heating furnace 101 and heated while rotating, the resin powder in a fluid state is outside the resin lining object 50. It adheres evenly to the surface. In addition, by rotating the resin lining construction object 50 so that the top and bottom of the resin lining construction object 50 are reversed during lining, dripping of the attached resin powder can be prevented and uniform film thickness construction can be performed. The rotary drive 16 has a function of adjusting the rotation speed so that the resin powder easily adheres to the resin lining object 50 in the furnace.

  Further, as described above, the high frequency induction heating furnace 101 is supplied with the resin powder from the upper part and supplied with the fluid for flowing from the lower part. By supplying the resin powder from above, convection of the resin powder at the time of stirring is likely to occur, and the resin lining can be efficiently and effectively performed. Further, by supplying the fluid for flow from the lower part, it is possible to reliably stir the resin powder that tends to accumulate in the lower part due to its own weight when stationary, and to prevent the powder from staying in the lower part.

  Here, if the inner cylinder 5, the floor plate 6 and the upper lid 7 themselves are heated in the same manner as the resin lining construction object 50, the resin powder adheres to these parts, and the heating furnace itself is used. In this embodiment, the inner cylinder 5, the floor plate 6 and the upper lid 7 are made of an inorganic material having no magnetism, so that there is no problem of resin powder adhesion due to heating. It is like that.

  Further, in order to continuously maintain the flow state of the resin powder, air or inert gas is discharged from the exhaust port 26 through the exhaust filter 27 and the exhaust conduit 28. The exhaust filter 27 is provided for the purpose of preventing the resin powder from being discharged.

  In this way, the resin powder is flowed and adhered to the heated resin lining construction object 50, but when the predetermined film thickness is secured, the filter valve 31 is opened and the exhaust filter is removed from the exhaust passage. 27, the resin powder that has not adhered to the resin lining construction object 50 is recovered from the exhaust port 26 to the recovery container 32 through the exhaust conduit 28 and reused.

  As described above, according to the present embodiment, the resin lining object 50 is heated by the high-frequency induction heating furnace 101 provided with the powder supply means and the powder flow means, so that the lining object 50 is pre-heated after preheating. Lining can be performed by immersing in resin powder without going out. Therefore, unlike the electrostatic powder coating method and the conventional fluidized dipping device, it is not necessary to preheat outside the device, so work efficiency can be improved, such as shortening the work time and reducing the number of workers. As in the electrostatic powder coating method, it is possible to prevent the working environment from being deteriorated due to the external scattering of the resin powder.

In addition, deterioration of the resin material due to repeated preheating can be prevented, and bubbles are hardly generated in the lining film.
Furthermore, the surface temperature of the resin lining object is made uniform by high-frequency induction heating, so that a resin lining with little change in film thickness can be achieved, and a predetermined film thickness can be achieved by a single operation. Conventionally, the reuse efficiency of the resin powder once used has been low, but the reuse efficiency of the resin powder is greatly improved in this apparatus.

Embodiment 2. FIG.
Next, a fluidized immersion lining apparatus according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 2 shows a structural diagram of the fluidized immersion lining apparatus 200, which is the same as the fluidized immersion lining apparatus 100 of FIG. 1 except for the structure and construction method described below.

  A suspension rod 210 is provided at the central portion of the upper lid 7 of the fluid immersion lining apparatus 200 so as to protrude and hang down into 101a. The upper end of the suspension bar 210 passes through the upper lid 7 and is connected to an external rotary drive 216. The suspension bar 210 can attach the resin lining object 250 having a shape that is difficult to attach to the fixture 10 of FIG. 1, and the lining is performed while rotating the resin lining object 250 by the rotary drive 216. Can do.

The fluid immersion lining apparatus according to the second embodiment can provide the same operational effects as those of the first embodiment.
In addition, depending on the shape of the resin lining construction object, for example, as shown in FIG. 2, it is suspended rather than being attached to a rotating shaft around the horizontal axis and heated and rotated, such as an elongated shape with a particularly long dimension in one direction. In this embodiment, the resin lining can be applied particularly favorably to the resin lining object to be formed in this embodiment.

  Note that the present invention described above is not limited to the above-described embodiment, and can be implemented with various modifications. First, the injection port of the powder supply unit and the exhaust port of the fluid fluid exhaust unit may be provided in the upper lid instead of the upper part of the inner cylinder of the furnace wall. Further, the fine hole for supplying the fluid for flow into the high frequency induction heating furnace may be provided in the lower part of the inner cylinder instead of the floor plate of the furnace wall. Further, the fluid for fluid may be fluid other than air or inert gas as long as the resin powder can be suitably fluidized.

  In addition, for the heating mode during the lining construction, in the above embodiment, when the temperature is lowered during the lining, what was preheated before the lining is performed is heated by the high frequency even while the resin powder is flowing, Although the temperature of the lining object is kept constant, the present invention is not limited to this. That is, if the temperature of the object to be enforced decreases during the lining construction, the flow of the resin powder is temporarily stopped, and after the temperature is increased by high-frequency heating, the lining operation with the flow of the resin powder is resumed. It may be.

It is a side view which shows the structure of the fluid immersion lining apparatus which concerns on Embodiment 1 of this invention. It is a side view which shows the structure of the fluid immersion lining apparatus which concerns on Embodiment 2 of this invention.

Explanation of symbols

4 furnace wall 5 inner cylinder 6 floor board (high frequency induction heating furnace, powder flow means)
7 Upper lid 9 Rotating shaft (shaft means)
10 Attaching tool 16, 216 Rotation drive (drive means)
23 Inlet (powder supply means)
26 Exhaust port 27 Filter 28 Exhaust conduit (exhaust passage)
32 Collection container 50 Lining object 100, 200 Fluid immersion lining device 101 High frequency induction heating furnace 210 Hanging rod

Claims (8)

A high-frequency induction heating furnace that accommodates objects to be lined and heats them at high frequency;
Powder supply means for supplying resin powder into the high-frequency induction heating furnace;
A fluidized immersion lining apparatus comprising powder flow means for supplying a fluid for flow into the high-frequency induction heating furnace and causing the resin powder to flow.   The furnace wall of the high-frequency induction heating furnace is made of an inorganic material, and a part of the furnace wall is made of a porous ceramic member that blows and supplies the fluid for flow into the furnace. Item 2. The fluid immersion lining apparatus according to item 1. The furnace wall of the high frequency induction heating furnace has an inner cylinder, a floor plate, and an upper lid,
The powder supply means has an inlet that is formed on the upper lid or the inner cylinder and supplies the resin powder into the furnace.
The powder flow means has fine holes formed in the floor plate and supplying the flow fluid into the furnace.
The fluidized immersion lining device according to claim 1 or 2, characterized in that   4. The flow fluid exhausting unit formed on the upper lid or the upper part of the inner cylinder and having an exhaust port for exhausting the fluid for flow outside the furnace is provided. 5. The fluidized immersion lining apparatus as described.   The flow fluid exhaust means includes a resin powder blocking filter provided so as to open and close an exhaust passage connected to the exhaust port, and a resin powder collection container provided downstream of the resin powder blocking filter; The fluidized immersion lining device according to claim 4, comprising: A fitting provided in the furnace of the high-frequency induction heating furnace and capable of detachably attaching a lining enforcement object;
Shaft means for rotatably supporting the fixture in a furnace;
The fluid immersion lining device according to any one of claims 1 to 5, further comprising a driving unit that rotationally drives the fixture from outside the furnace. A suspension rod that is provided on the upper lid of the high-frequency induction heating furnace and suspends the lining enforcement object in the furnace,
The fluid immersion lining device according to any one of claims 1 to 5, further comprising a driving unit that is provided outside the upper lid and rotates the suspension rod. Using the fluidized immersion lining device according to any one of claims 1 to 7,
A fluidized immersion lining method characterized in that the object to be lined is preheated in the high frequency induction heating furnace, and after preheating, the object to be lined is immersed in a resin powder without taking it out of the furnace. .

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