JPH04243987A - Powder coating system of ceramic product - Google Patents

Abstract

PURPOSE:To carry out speed-up of soldering, to use inexpensive lead wire, to form a uniform and stable insulating coating film while eliminating foaming phenomena during coating film formation of insulating coating film and to simplify the whole system not requiring a masking device, omitting a cleaning process and having excellent maintenance. CONSTITUTION:A coating line consists of a heating and transporting conveyer 2 of heating and controlling ceramic products, to be covered with a heat generating coating film, at a given temperature and a laying conveyer of transporting in a laying state, a soldering device of soldering lead wire to the heat generating coating film and a powder coating compound feeder for spraying a powder coating compound on the whole surface of the heat generating coating film are successively installed and the powder coating compound is fused to coat the products with an insulating coating film.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder coating system for ceramic products, which enables coating of ceramic products with a powder coating.

0002

[Prior Art] Conventionally, liquid paints containing a solvent to give the paint fluidity have been generally used as paints to form a film on the surface of an object to protect it. When used in products, it must be heat-cured after application, and for this reason, in the case of porous and water-absorbing ceramic products, the air and moisture inside the ceramic product is heated during heat-curing. This has the disadvantage that it is discharged to the outside and appears on the surface as foam, making it impossible to form a protective film.

[0003] Furthermore, since liquid paint has a very short pot life, which is the time it takes to harden, it is not possible to stop the production line, resulting in defective ceramic products before the painting process. If there is a problem, the production line cannot be stopped, which results in the formation of a film on defective products, resulting in poor product yield, and if the production line is stopped for a long time. Moreover, since it is a liquid paint, the painting equipment must be cleaned after each working day, making it less easy to maintain, and it also has the drawback of deteriorating the environment due to the solvent in the liquid paint. Ta.

0004

[Problems to be Solved by the Invention] The present invention not only speeds up soldering, but also enables the use of inexpensive lead wires, and eliminates the foaming phenomenon during the formation of an insulating coating, thereby achieving uniform and stable soldering. It is an object of the present invention to provide a powder coating system for ceramic products that forms an insulating film, eliminates the need for a masking device, eliminates a cleaning process, has excellent maintainability, and simplifies the entire system.

[0005]

[Means for Solving the Problems] In view of the problems of foaming phenomenon, yield, etc. based on the above-mentioned prior art, the present invention involves heating a ceramic product to a predetermined temperature, then soldering the lead wires, and applying a heat-generating coating using powder paint. The object of the present invention is to provide a powder coating system for ceramic products which is capable of coating ceramic products to overcome the above-mentioned drawbacks.

[0006] As a powder coating system for ceramic products, a heating conveyor is installed at the base end of the line to convey a ceramic product coated with a heat-generating coating that generates heat when energized to a predetermined temperature. , a coating line is formed by linking the heated conveyor with an inverted conveyor that conveys ceramic products in an inverted state, and a soldering device that solders lead wires to the heat-generating coating from the conveying upstream side of the inverted conveyor, and a powder coating. Powder paint supply devices that spray powder paint over the entire surface of the heat-generating coating are sequentially arranged, and the powder paint is fused by the temperature of the preheated tile to coat the insulation film.

[0007]

[Function] In the present invention, a ceramic product that has been fired and glazed in advance and has a heat-generating film coated on the back side is heated to a predetermined temperature on a heating conveyor and conveyed to a soldering position of a soldering device. The lead wire is soldered to the heat generating film at this position.

[0008] After that, the ceramic product to which the lead wires have been soldered is transported to the coating position, and at this position, powder paint is sprayed by a powder paint supply device, so that the powder paint is melted by the heat of the tiles. It is cured and coated as an insulating film.

The heating temperature of the ceramic product by the heating conveyor is controlled so that it is lower than the melting temperature of the solder when it reaches the soldering device, and the heating temperature of the ceramic product by the heating conveyor is controlled so that it is lower than the melting temperature of the solder when it reaches the coating position by the powder coating supply device. The temperature is controlled to a temperature at which the powder coating fuses and hardens.

0010

[Embodiment] An embodiment of the present invention will be described below based on the drawings. Reference numeral 1 is a powder coating system according to the present invention, in which a heating conveyor 2, an overturning conveyor 3, and a stock conveyor 4 are successively connected. A counter transfer device 6 is disposed between the heating conveyor 2 and the overturning conveyor 3 of the coating line 5, and a soldering device 7 and a powder coating are provided on the coating line 5. It is configured by disposing a coating device 8.

The heating conveyor 2 has a conveyor frame 9
Rotating bodies 10, 10 such as sprockets pivotally supported at both ends of
Wind endless chains 11 and 11a around a,
The upper surfaces of the chains 11, 11a are arranged so as to face the front and back surfaces of both sides of a ceramic product (hereinafter referred to as "tile W"), which has a heat-generating coating F and an electrode E applied to the back surface of a tile W that has been fired and glazed in advance. Upright receivers 13, 13a formed by protruding support rods 12, 12a, etc. in a fork shape are attached to the mounts.

[0012] Also, in the middle part of the conveyor frame 9, a temperature is set such that when the tile W being conveyed in an upright state reaches the powder paint coating device 8, the temperature is such that the fusion and curing reaction of the powder paint occurs. A heating furnace 14 is provided which is equipped with an appropriate heat source such as hot air, electric heater, microwave, etc. for heating to a predetermined temperature.

In the figure, reference numeral 15 denotes a drive section for driving the heating conveyor 2. As shown in FIG.

The lodging conveyor 3 includes a rotating body 18 such as a sprocket, which has endless chain belts 16, 16a which are driven in circulation so as to receive the tiles W on both sides and convey them in a laid down manner, which are pivotally supported at both ends of the conveyor frame 17. , 18a.

In the figure, reference numeral 19 denotes a drive section for driving the falling conveyor 3.

[0016] Further, a mounting member having a curved surface matching the shape of the tile W can be freely raised and lowered via guide shafts 20, 20a below between the chain belts 16, 16a at the receiving position P2, which is the starting end side of the lodging conveyor 3. 21 is disposed, and the mounting member 21 is connected to a cylinder 22, and by the operation of the cylinder 22, the tile W on the mounting member 21 is moved by the chain belt 16.
, 16a A tile placement unit 23 that is controlled to move up and down so as to be transferred to the top.
has been set up.

The counter-transfer loading device 6 has a moving plate 26 disposed above the frame 24 so as to be movable back and forth via guide shafts 25, 25a extending horizontally between the heating conveyor 2 and the falling conveyor 3. The reciprocating movement of the movable plate 26 is controlled by the operation of the cylinder 27.

Further, below the movable plate 26, an elevating body 29 is connected to a cylinder 30 via guide shafts 28, 28a so as to be movable up and down. Fixed plates 32, 3 via 31a...
2a are provided for each.

Further, bearing members 33, 3 are provided at the bottom of the fixed plates 32, 32a so as to be rotatable and slidable in the axial direction perpendicular to the conveying direction of the heating conveyor 2.
3a supports the rotationally moving shaft bodies 34, 34a via...
A clamping body 35, 35a having a U-shaped cross section is attached to one end of the rotating shaft body 34, 34a, and the clamping body 35, 35a is
A cylinder 3 is installed at the other end of the rotary shaft bodies 34, 34a so as to face both sides of the tile W and to control the movement in opposite directions.
6, 36a are connected.

In addition, a buffer member 38 made of a heat-resistant material such as urethane is provided in the recess 37 of the clamping bodies 35, 35a into which both end edges of the tile W are fitted, in order to prevent damage when the tile W is clamped. Good too.

Further, a rotary shaft 39 is rotatably mounted on the upper part of the fixed plates 32, 32a in parallel with the rotationally movable shafts 34, 34a, and a pinion gear 40 is disposed in the middle of the rotary shaft 39.
is fixed, and meshes with a rack gear 41 provided slidably in the same direction as the conveyance direction of the heating conveyor 2, and the rack gear 41 is connected to a cylinder 42, and the rotation of the rotating shaft 39 is controlled by the operation of the cylinder 42. ing.

[0022] Also, the intermediate portions of the rotationally moving shafts 34, 34a are configured to be slidable in the axial direction, and the rotationally moving shafts 34, 34a
At the same time, the pulleys 43, 43a are mounted on which only the rotation of the pulleys 4, 34a is restricted, and the pulleys 44, 44a are fixed on both sides of the rotating shaft 39.
Timing belt 4 between 3, 43a, 44, 44a
5 and 45a are wound around each other, and the rotation of the rotating shaft 39 caused by the operation of the cylinder 42 is transmitted to the rotationally moving shaft bodies 34 and 34a, thereby controlling the rotation.

[0023] The soldering device 7 connects the connector Y at one end to the electrode E of the heat-generating coating F which has a heat-generating effect by energization and is coated on the back side B of the roof tile W which is stopped and fixed at the coating position CP of the falling conveyor 3. The lead wire L is supported and positioned by an appropriate mechanism, and soldering is performed.

The powder coating device 8 is mounted on a movable frame 4.
6. Comprised of powder paint supply device 47, soldering device 7
Powder paint is sprayed over the entire upper surface of the heat-generating coating F of the tile W to which the lead wire L is soldered.

The movable frame 46 has a fixed base 48 fixed to the side of the collapsing conveyor 3, and linear rails 49, 4 are installed on the upper part of the fixed base 48 in a direction perpendicular to the conveyance direction of the collapsing conveyor 3.
9a are arranged in parallel, and a plate 51 is slidably attached to the linear rails 49, 49a through guides 50, 50a.

The fixed base 48 also has rotating shafts 52, 52a.
is mounted horizontally so as to be freely rotatable parallel to the conveying direction of the toppling conveyor 3, and a sprocket 53 is fixed to one rotating shaft 52, and the sprocket 53 and the driving part 54 are connected by a connecting member 55 such as a chain. , the rotation of the rotating shafts 52, 52a is controlled by the operation of the drive unit 54, and the rotating shafts 52, 52a are
Sprockets 56, 56a are fixed to the sprockets 56, 56a, and a connecting member 57 such as a chain
They are linked and interlocked.

Further, a disc 58, 58a is fixed to one end of the rotating shaft 52, 52a, and the disc 58, 58a is
Engaging bodies 60, 60a with rollers 59, 59a attached to both ends are fixed to the outer peripheral edge of the rollers 59, 59.
Engagement plates 62, 62a with elongated holes 61, 61a bored in the vertical direction so that a... can be freely moved are hung from the lower surface of both ends of the plate 51, and rollers 59, 5 are inserted into the elongated holes 61, 61a.
9a... are fitted to constitute a first conversion mechanism 63 that converts the rotational movement of the rotating shafts 52, 52a into horizontal linear movement.

Further, one rotating shaft 52 and the plate 51 are connected by a second conversion mechanism 64 such as a cam mechanism, so that the rotating shaft 52
The rotational motion of the plate 51 is converted into vertical linear motion, and the movement locus of the plate 51 is made to correspond to the curved shape of the tile W to be stopped and fixed on the lodging conveyor 3 by the first conversion mechanism 63 and the second conversion mechanism 64. .

The powder paint supply device 47 has a gate portion 67 that drops the powder paint at the tip onto a vibrating device 66 that fixes a linear feeder plate 65 having a U-shaped cross section and opening upward onto the plate 51 of the movable frame 46. is appropriately tilted downward and positioned above the coating position CP of the falling conveyor 3.

Further, an intermediate hopper 68 is disposed above the rear portion of the linear feeder plate 65, and a vibrating sieve 69 for supplying a fixed amount of powder coating is disposed above the intermediate hopper 68. A paint tank 70 containing powder paint is disposed above.

[0031] Also, the coating position C of the falling conveyor 3
P is provided with a stopper 71 that is controlled to move up and down to stop the conveyance of the tile W, and holding plates 72 and 72a are disposed on both sides of the tile W whose conveyance has been stopped by the stopper 71 so that the tile W can move forward and backward toward the tile W side. A fixing device 74 is provided to connect the cylinders 73, 73a to the clamping plates 72, 72a and control the cylinders 73 and 73a to clamp and fix them.

In the figure, 75 is a coating booth, and 76 is a coating booth.
is a back filter device that exhausts the air inside the coating booth 75.

Epoxy resins are preferable as powder coatings, but they are not limited to such epoxy resins, and any resin that fuses by heating and causes a curing reaction may be used, such as acrylic resins, silicone resins, It may be made of urethane resin.

Reference numeral 77 denotes a reheating furnace provided with an appropriate heat source, which is disposed downstream of the powder coating device 8 as required.

The stock conveyor 4 is a conveyor frame 7
Rotating bodies 79, such as sprockets, pivoted at both ends of 8, 7
An endless chain 80, 80a is wound around 9a, and support rods 81, 81a are provided in a fork shape on the upper surface of the chain 80, 80a so as to face the front and back surfaces of both sides of the roof tile W. Raising tools 82, 82a are installed.

[0036] Also, to explain a snow melting tile manufacturing system which is an example of using the powder coating system for ceramic products according to the present invention, the base material is conveyed lying down on the side of the coating line 5 with the back side B of the tile W facing upward. A conveyor 101 is disposed, the tiles W on the base material conveyor 101 are transferred onto a pallet (not shown) via a transfer device 102, and a pallet conveyor 103 is disposed to sequentially convey the pallets. During the conveyance path of the pallet conveyor 103, a surface treatment device 104 having functions such as sandblasting that adjusts the surface roughness of the back surface B of the tile W, a plasma spraying device 105 that applies a heat-generating coating F that generates heat when energized, and a heat-generating device Electrode spraying device 1 for depositing an electrode E for soldering a lead wire L onto a coating F
06. A resistance measuring device 107 is provided to measure the resistance value of the heat-generating film F and judge whether it is good or bad.

Furthermore, the terminal end of the pallet conveyor 103 and the starting end of the heated transport conveyor 2 are connected via a transfer device 102 at a traverser 108, and a defective product discharge conveyor 109 is connected to an intermediate portion of the traverser 108. A series of snow melting tile manufacturing systems 110 are constructed.

Next, to explain the operation of the powder coating system according to the present invention, the roof tile W coated with the heat-generating coating F and the electrode E is coated on both front and back sides by the support rods 12, 12a of the heating conveyor 2. While being supported, the particles are transported intermittently in an upright position, and when they reach the coating position CP of the powder coating device 8 in the heating furnace 14, the temperature is such that the powder coating undergoes a fusion and curing reaction. The tile W is heated to a predetermined temperature, the heating conveyor 2 is changed to a substantially horizontal position at a receiving position P2 on the terminal end side, and the heated conveyor 2 is stopped.

Next, the cylinders 36, 36 are set in advance so that the gap between the clamping bodies 35, 35a is wider than the width of the tile W.
The movement of the rotary shafts 34, 34a is controlled by the operation of a, and in this state the cylinders 27, 30 are operated to position the clamping bodies 35, 35a facing each other on both sides of the roof tile W, and the cylinders 36, 36a are operated. The holding body 35
35a is moved inward, and the tile W is held between the holding bodies 35 and 35a.

Next, the cylinder 27 is operated in the above-mentioned clamped state to move the tile W forward by a predetermined amount so as to release the support from the support rods 12, 12a, etc., and then the cylinder 30 is operated to raise it and collapse it. The tile W is moved to above the delivery position P1 of the conveyor 3.

In this movement process, by operating the cylinder 42 and rotating the rotating shaft 39 by 180 degrees in a predetermined direction via the pinion gear 40 and the rack gear 41, the rotating shaft 39 is rotated through the timing belts 45, 45a. 34, 34a are rotated by the same angle and the clamping body 35
, 35a is inverted.

After that, the delivery position P1 of the overturning conveyor 3
The mounting member 21 provided on the chain belt 16, 16a
The cylinder 22 is activated and raised in advance so as to protrude from the upper surface, and the cylinder 30 is activated to lower the tile W and transfer it onto the mounting member 21, and then the cylinders 36, 3
6a to move the clamping bodies 35, 35a outward to release the clamping of the tile W by the clamping bodies 35, 35a, and then operate the cylinder 22 to lower the placement member 21 and remove the tile W from the clamping bodies 35, 35a. The tile W on the member 21 is connected to the chain belt 16,
16a.

Then, the tile W is transported to the soldering position HP of the soldering device 7, stopped and fixed by an appropriate mechanism, and the lead wire L is soldered to the electrode E.

Next, the tile W to which the lead wire L is soldered is conveyed to the coating position CP of the powder paint coating device 8, and at this position the tile W is stopped by the stopper 71, and the cylinders 73, 73a are stopped. The tile W is clamped and fixed on both sides by the clamping plates 72 and 72a, and the powder paint in the paint tank 70 is sequentially supplied in fixed quantities to the linear feeder plate 65 via the vibrating sieve 69, and the vibrating device 66 is activated to cause the powder paint on the linear feeder plate 65 to fall downward from the gate portion 67.

[0045] When the powder coating is supplied by dropping,
The drive unit 54 of the powder coating supply device 47 is operated to rotate the discs 58, 58a fixed to the rotating shafts 52, 52a, and the engaging bodies 60, 60 are attached to the discs 58, 58a.
The engaging plates 62, 62a connected to each other by the rollers 59, 59a of a are controlled to move forward and backward toward the lodging conveyor 3 side, and the plate 51 is moved along the curved shape of the tile W via the second conversion mechanism 64. The movement of the plate 51 is controlled.
The heat-generating coating F of the roof tile W is uniformly spread over the entire surface of the heat-generating coating F of the roof tile W from the gate portion 67 of the linear feeder plate 65 fixed via a vibrating device 66.

[0046] The sprayed powder coating is preliminarily applied to the roof tile W, which is positioned at a temperature (usually 150 to 180 degrees) at which the powder coating is fused and hardened at the coating position CP.
It is fused and hardened by the heat of the heat, and is coated as an insulating film RF.

Furthermore, the heating temperature of the tile W by the heating furnace 14 of the heating conveyor 2 is controlled so that it is lower than the melting temperature of the solder when it reaches the soldering device 7, and the heating temperature of the tile W is controlled to be lower than the melting temperature of the solder when it reaches the soldering device 7. The temperature is controlled so that the temperature reaches the point at which the powder coating fuses and undergoes a curing reaction.

[0048]

[Effects of the Invention] In short, the present invention includes a heating conveyor 2 that conveys a ceramic product coated with a heat-generating coating F that generates heat when energized at the base end of the line, heating it to a predetermined temperature and conveying it. A painting line 5 is formed by linking the conveyor 2 with a lodging conveyor 3 that conveys ceramic products in a laid-down state, and a soldering device 7 that solders the lead wire L to the heat-generating coating F from the conveyance upstream side of the lodging conveyor 3. Powder paint supply devices 47 that spray powder paint over the entire surface of the heat-generating coating F are sequentially arranged, and the powder paint is fused by the temperature of the preheated ceramic product to coat the insulating film RF. Therefore, the ceramic product, which has been fired and glazed in advance and has a heat-generating film F coated on the back side B, is heated to a predetermined temperature on the heating conveyor 2, and is transported to the soldering position of the soldering device 7, and then placed at that position. Since the lead wire L can be soldered to the heat-generating coating F, the temperature at which the electrode E, which is the soldering point, is heated during soldering is small, and the soldering speed can be increased. By soldering the lead wires L after the wires have been soldered, it is also possible to use inexpensive vinyl electric wires that do not have much heat resistance.

Furthermore, the ceramic product to which the lead wire L is soldered is transported to the coating position CP, and the powder coating is sprayed at this position by the powder coating supply device 47, so that the powder is coated by the heat of the tile W. Since the paint can be fused and cured to form the insulation coating RF, the moisture contained inside the ceramic product is discharged in advance, which may cause a foaming phenomenon when the insulation coating RF is formed. Since there is no porosity, it is possible to form a uniform and stable insulating film RF.

[0050] Furthermore, by using the powder paint supply device 47 that uses vibration and resonance to apply powder paint to the entire surface of the heat-generating coating F, it is possible to eliminate the need for a masking device. Therefore, it is possible to eliminate the cleaning process that is absolutely necessary with conventional liquid paints when the painting line 5 is stopped or finished, making it possible to improve maintainability and simplify the entire system. The practical effects are enormous.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a powder coating system for ceramic products according to the present invention.

FIG. 2 is a plan view of the heating conveyor.

FIG. 3 is a side view of the heating conveyor.

FIG. 4 is a plan view of the lodging conveyor.

FIG. 5 is a side view of the lodging conveyor.

FIG. 6 is a front view of the lodging conveyor.

FIG. 7 is a partially omitted side view of the counter-transfer loading device.

[FIG. 8] A in FIG. 7 showing a reversing device in a reversing transfer device.
- A view from arrow A.

FIG. 9 is a side view of a main part of a reversing device in the reversing transfer device.

10 is a view taken along the line B-B in FIG. 7 showing the tile placement section of the lodging conveyor.

FIG. 11 is a partially omitted side view of a movable stand in the powder paint coating device.

FIG. 12 is a partially omitted front view of a movable stand in the powder paint coating device.

FIG. 13 is a partially omitted side view of the powder paint coating device.

FIG. 14 is a plan view of the stock conveyor.

FIG. 15 is a side view of the stock conveyor.

FIG. 16 is a perspective view of the back side of the tile to which lead wires are soldered.

FIG. 17 is a schematic plan view of a snow melting tile manufacturing system.

[Explanation of symbols]

2 Heating conveyor 3. Overturning conveyor 5 Painting line 7 Soldering device 47 Powder paint supply device

Claims (1)

[Claims] Claim 1: A heating conveyor is provided at the base end of the line to convey a ceramic product coated with a heat-generating coating that generates heat when energized to a predetermined temperature, and the ceramic product is laid down on the heating conveyor. A painting line is formed by connecting the overturning conveyors that convey the condition, and a soldering device that solders lead wires to the heat-generating film from the conveyance upstream side of the overturn conveyor, and a powder that spreads powder paint over the entire surface of the heat-generating film. A powder coating system for ceramic products, characterized in that paint supply devices are sequentially arranged, and the temperature of the preheated ceramic product fuses the powder paint to coat the ceramic product with an insulating film.