JPS5833806B2 - Cement tile painting method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides ventilation gaps 2 between upper and lower cement tiles 1 in overlapping parts of a large number of cement tiles 1 arranged in a tiled state.
A large number of cement tiles 1 are conveyed by a metal conveyor 3, and a high voltage is applied between the electrostatic coating machine 4 and the conveyor 3 to apply a box-shaped coating to the cement tiles 1. The specified invention is a method for painting cement tiles characterized by sucking a part of the atomized and flying paint from the ventilation gap 2 to the lower part of the conveyor 3, and also the upper surface from which the air inside is sucked by the fan 6. A metal conveyor 3 having air permeability is arranged above the suction space 5 of the opening, and a ventilation gap 2 is formed between the upper and lower cement tiles 1 in the overlapping part of the cement tiles 1 arranged in a tiled manner on the conveyor 3. Placement protrusion 1 for
is provided on the upper surface of the conveyor 3, and an electrostatic coating machine 4 for applying a high voltage between the conveyor 3 and the electrostatic coating is disposed above the conveyor 3. The object of the present invention is to provide a method and device for painting cement tiles that can uniformly paint not only the top surface but also the side end surfaces of the cement tiles without corners.

In conventional cement tile painting, as shown in Fig. 7, cement tiles 1 are placed on a conveyor g in a tiled state and conveyed by a conveyor 3', and paint is sprayed from a general coating machine 4. Then, the surface of cement tile 1 was painted.

However, when painted in this way, cement tiles 1 and 8
a, b as shown in the figure.

C, d, e, f and the thickness of the coating film increased.

However, it is thinner as a and thicker as f.

When there was a difference in coating thickness in this way, it was noticeable that the coating thickness was extremely thin in the area indicated by a, and the product was not coated properly.

The present invention has been made in view of the above points, and the present invention will be explained in detail below with reference to Examples.

First, the electrostatic coating machine 4 will be explained. Reference numeral 3 is a pipe-shaped rotating shaft that rotates at high speed, has a female threaded portion 9 at the rear end, and is screwed and connected to a male threaded portion 11 at the tip of a relay pipe shaft 10.

A disk-shaped base body 12 is integrally provided at the tip of the pipe-shaped rotating shaft 8, and the hollow part 13 tip of the rotating shaft 8 is closed with the front wall of the base body 12, and the base body 12 is coaxial with the rotating shaft 8. Substrate 1 of
A cylindrical body 14 is integrally provided on the outer end side of 2.

The cylindrical body 14 has an inner circumferential surface that gradually increases in diameter in a tapered manner from the front to the rear of the base 12. It is continuous with tunnel parts 15..., and the tunnel parts 15...
... are formed at equal intervals in the circumferential direction at the outer peripheral end of the base body 12.

Further, a knife portion 16 is formed at the tip of the cylinder 14 by making the taper slope of the inner circumferential surface of the cylinder 14 even steeper.

Further, an annular air chamber 17 is formed on the outer periphery of the cylindrical body 14 rearward from the knife portion 16.
A plurality of air ejection holes 18 are bored at equal intervals in the front wall of the air conditioner.

The base body 12 is provided with an appropriate number of communication holes 19 radially outward from the hollow part 13 of the rotating shaft 8, and an annular air chamber 17.
is connected to the hollow portion 13 of the pipe-shaped rotating shaft 8 through the communication holes 19 .

In the figure, reference numeral 20 denotes a paint supply pipe, through which the paint is allowed to fall onto the inner peripheral surface of the rear part of the base 12 of the cylinder 14 from the tip 20a. communicatively connected to the supply section 21;
Paint is supplied continuously.

This paint supply section 21 is one that has been subjected to high voltage insulation treatment.

Reference numeral 22 denotes a fixed cylinder fixed on the front surface of the air motor 23 coaxially with the motor shaft 24. A bearing cylinder 25 is disposed at the tip of the fixed cylinder 22. Bearing bearings 26, 26 and these bearing bearings 26
, 26 are disposed to form a button, and a relay pipe shaft 1 is connected to the tip of the motor shaft 24 via a joint 28.
The rear end of 0 is connected.

The relay pipe shaft 10I/c has a hollow portion 2 whose rear end is closed.
9, and a through hole 30 that opens to the outer peripheral surface of the relay pipe shaft 10 is communicated with the rear end of the hollow portion 29.

An annular groove 31 is formed on the inner circumferential surface of the metal part 27 corresponding to the opening 30a of the through hole 30, and a connecting hole 32 is connected to the annular structure 31, and an air tube 3 is connected to the rear end of the connecting hole 32.
3, high pressure air is fed into the annular groove 31 from the high pressure air generation source 34, and the high pressure air is further fed from the annular groove 31 into the hollow portion 29t13 of the relay pipe shaft 10 and the pipe-shaped rotating shaft 8. It is introduced into the annular air chamber 17 through the communication holes 19 of the base body 12, and the annular cylindrical jet air stream is sent forward from the annular air chamber 11 along the outer peripheral surface of the cylinder body 14. .

A terminal screw 35 provided on the housing of the bearing tube 25 is used to connect the other end of a lead wire 37 whose one end is connected to a high voltage generation source 36, and is used to connect the metal conveyor 3 and the fixed tube 22. , relay pipe shaft 10, rotating shaft 8, cylinder body 14, base body 1
A high voltage is applied between the

A plurality of electrostatic coating machines 4 having the above-mentioned configuration are arranged at an appropriate angle above the metal conveyor 3.

In this case, the cylinders 14 of the plurality of electrostatic coating machines 4 are arranged so that their openings face obliquely forward and downward, and the other cylinders 14 are arranged so that their openings face diagonally downwardly.

The metal conveyor 3 is grounded by appropriate means.

The metal conveyor 3 is made of air permeable material, and may be made of wire mesh or punching board, or may be made of cedar bark by providing intervals between the ivy strips of the slatter-like conveyor. There is.

Placement protrusions 7 are protruded on this conveyor 3 at pitches at which cement tiles 1 are placed, and the cement tiles 1 arranged in a tiled manner on the conveyor 3 are inclined by the placement protrusions 7. , a ventilation gap 2 is formed between the cement tiles 1 in the overlapping part of the cement tiles 1.

A suction space 5 is provided below the conveyor 3, and air in the suction space 5 is sucked by a fan 6.

Next, a method of the present invention for coating cement tiles using the cement tile coating apparatus of the present invention constructed as described above will be explained.

First, water is added to 2 parts cement) sand, kneaded and molded, and after curing for 10 days, it is naturally dried to have a moisture content of 4 to 1.
Cement tile 1 with 0% content is obtained.

This cement tile 1 with a moisture content of 4 to 10 yen is heated at 30℃ to 40℃.
The surface is preheated to remove moisture from the surface and create a surface condition that is suitable for painting.

In this case, the moisture content of the parts other than the surface of cement tile 1 is 4 to 1.
It holds the 0 section.

Here, the moisture content of cement tile 1 is 4 to 10%, which is 10
If it is more than 4%, the adhesion of the paint will be poor, and if it is less than 4%, the suction force during electrostatic painting will be weak.

As a result, it is necessary to use a cement tile 1 with a moisture content of 4 to 10%, and a moisture content of 6 ton is good for a good case.

After preheating the cement tiles 1 with a moisture content of 4 to 6φ, the cement tiles 1 are arranged in a tiled state on the conveyor 3, and at the mounting protrusion 7, the overlapping parts of the cement tiles 1 are placed between the ends of the cement tiles 1. It is conveyed with a ventilation gap 2 formed.

Therefore, the front surface 1a, front surface 1b and side surface 1c of each cement tile 1 are directly exposed to the outside.

Next, a high voltage is applied between the cylindrical body 14 and the metal conveyor 3 to electrostatically coat the cement tiles 1 carried by the conveyor 3.

Specifically describing the electrostatic coating method in the present invention, paint is supplied from the paint supply section 21 to the supply pipe 20 via the paint tube 38, and is continuously supplied in small amounts from the opening at the tip 20a of the supply pipe 20. The paint is caused to flow down onto the rear inner circumferential surface of the cylinder 14.

On the other hand, the high-pressure air flow supplied from the high-pressure air generation source 34 through the air tube 33 rotates the air motor 23, thereby causing the rotating shaft 8, the base body 12, the cylinder body 14,
The motor shaft 24, relay pipe shaft 10, etc. are rotated at high speed.

Centrifugal force acts due to the high speed rotation of the cylinder 14 of the paint tobacco that has flowed into the inner peripheral surface of the tube 14, causing it to spread to the rear inner peripheral surface of the cylinder 14 and at the same time cause the inner peripheral surface of the cylinder 14 to taper. It moves in the direction of the tip in a thin film shape, and finally passes through the tunnel part 15 of the base body 12 and is supplied to the front inner circumferential surface of the cylinder 14, and then the front inner circumferential surface of the cylinder 14. Also, since it does not spread in the inner circumferential direction, it is supplied in the form of a thin film along the taper toward the knife portion 16.

The paint thus formed into a thin film is supplied to the knife section 16, where it is electrostatically atomized by the action of a high electric field caused by a high voltage applied to the cylinder 14, etc., and further atomized. Due to the action of this electric field, the atomized paint starts flying toward the cement tile 1 with a moisture content of 4 to 10% on the metal conveyor 3 kept at ground potential.

- The atomized paint is atomized by the wind pressure of the annular jet stream that is ejected from the air outlet 18 provided at the rear of the knife part 16 and flows in a spiral shape, and the paint supplied from the knife part 16 is atomized. An initial velocity is given to the atomized paint, and the atomized paint is transferred to the cement tile 1 by the action of the electric field.
Forced to fly in a certain direction.

The atomized paint that is atomized by the synergistic effect of the high electric field and the jet stream as described above is given an initial velocity by the jet stream and is accelerated by the high electric field, causing it to fly in one direction of the cement tiles. However, at the same time, the atomized paint is surrounded by the annular cylindrical jet stream flowing in a spiral shape, preventing the atomized paint from scattering in unnecessary directions, and changing the flying direction of the atomized paint. The atomized paint is uniformized in the direction of the cement tile 1, and the atomized paint is applied to the externally exposed portions of the cement tile 1, namely the surface 1a, front 1b, and side 1c.

At this time, the air in the suction space 5 is sucked by the fan 6, and a part of the atomized paint is sucked out from the ventilation gap 2, so that the paint is sufficiently deposited on the front surface 1b and the rear surface 1b of the cement tile 1. .

As described in the description, the present invention transports a large number of cement tiles arranged in a tiled state on a metal conveyor, and applies electrostatic coating to the cement tiles by applying a high voltage between the electrostatic coating machine and the conveyor. Because of this coating, it is possible to achieve a uniform coating with no uneven coating thickness compared to using a general coating machine.In addition, when arranging cement tiles in a tiled state, it is possible to paint the overlapping parts of the cement tiles top and bottom. A ventilation gap is formed between the cement tiles, and some of the atomized and flying paint is sucked downward from the conveyor through the ventilation gap, so the paint is spread all over the edge of the cement tile. It can be painted evenly.

In the combined invention of the present invention, a conveyor having ventilation is arranged above the suction space of the top opening where air is sucked into the inside by a fan, so that air is uniformly drawn from a large number of passages. The paint can be sucked up and the paint evenly spreads over the end face of each cement tile.Moreover, there is a placement protrusion on the conveyor, so each cement tile is placed on the placement protrusion and the cement tile is tilted. It is possible to create ventilation gaps between each cement tile by simply letting it slide.

As the paint used in the present invention, for example, a urethane resin paint is used, to which urethane thinner is added as a solvent, and an inorganic pigment such as aluminum powder is also added, but this is not necessarily the only one. It is not limited.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the coating state of the present invention, Fig. 2 is a front sectional view of the same as above, Fig. 3 is a front view of the head of the electrostatic coating machine of the present invention, and Fig. 4 is the same as Fig. 3. XX sectional view, Fig. 5 is a sectional view of the relay pipe shaft section of the same as above, Fig. 6 is a schematic oblique raft diagram showing the entire electrostatic coating machine of the above, and Fig. 7 is a normal view showing the conventional painting method. The sectional view and FIG. 8 are perspective views showing the coating state of the conventional example, in which 1 is a cement tile, 2-pore ventilation gap, 3 is a conveyor, 4 is an electrostatic coating machine, 5 is a suction space, 6 is a fan, 7 is a placement protrusion.

Claims (1)

[Scope of Claims] 1. A large number of cement tiles arranged in a tile roofing state are conveyed by a metal conveyor so that ventilation gaps are created between the upper and lower cement tiles in overlapping parts, The present invention is characterized in that a high voltage is applied between the electrostatic coating machine and the conveyor to apply electrostatic coating to the cement tiles, and at the same time, two parts of the atomized and flying paint are sucked into the lower part of the conveyor through the ventilation gap. How to paint cement tiles. 2. A metal conveyor with ventilation is placed above the suction space of the top opening where the internal air is sucked by a fan,
A placement protrusion is provided on the top surface of the conveyor to form a ventilation gap between the upper and lower cement tiles in the overlapping part of the cement tiles arranged in a tiled manner on the conveyor, and a high voltage is applied between the conveyor and the cement tiles. A cement tile coating device comprising an electrostatic coating machine for electrostatic coating disposed above a conveyor.