JPH0832313B2 - Coating agent pressure feed system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pressure-feeding system for pressure-feeding a coating agent such as a primer, a paint, or an adhesive, particularly a coating agent which is hardened or reaction-altered by moisture in the air. Regarding

[Conventional technology]

2. Description of the Related Art Conventionally, when applying a coating agent, a system that pressure-feeds the coating agent using a pressure gas is often used.

In the conventional pressure feeding system, 150 Kg /
A high-pressure tank filled with high-pressure nitrogen gas of about cm ² is used.

Since the pressure of nitrogen gas from the high-pressure tank is too high for pumping the coating agent, the pressure is successively reduced by a two- to three-stage regulator, and finally an ultra-low pressure of 0.1-0.5 Kg / cm ² is applied to the pressure vessel. Has been added to.

[Problems to be Solved by the Invention]

In the above-described conventional pressure feeding system, since the high pressure tank is used, the difference from the pressure required for pressure feeding the coating agent is extremely large, and the precision of the set pressure is poor in the two-stage regulator, so the pressure reduction must be performed in multiple stages. did not become. Therefore, the regulator requires a lot of cost, and depending on the number of stages of the regulator and the set pressure value, if the pressure of the nitrogen gas filling the high-pressure tank drops significantly due to use, the pressure applied to the pressure vessel will drop. However, there is a problem that the pressure-feeding flow rate of the coating agent is reduced and uniform coating cannot be performed.

Further, since the high-pressure tank is large in both bulk and weight, it is not easy to replace it, and it is necessary to secure a transfer path for replacement, which causes a problem that the floor area required for the pumping system becomes large. there were.

In view of the above-mentioned problems, the present invention applies a pressure gas having no pressure fluctuation to a pressure container to make a pressure-feeding flow rate of a coating agent constant, and a pressure-feeding system for a coating agent which does not require replacement of a high-pressure tank as in the conventional case. Is intended to provide.

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention is a pressure-feeding system for pressure-feeding a coating agent by a pressure gas, which comprises a first regulator for reducing the pressure of compressed air from a compressed air source, and a compression from the first regulator. An air dryer for removing water contained in the air, a second regulator for decompressing the compressed air from the air dryer, and a pressure container for pressure-feeding the coating agent by the compressed air from the second regulator. It is characterized by.

[Work]

Compressed air from a compressed air source, such as an air compressor or an air tank, is depressurized in a first stage by a first regulator.

The set pressure of the first regulator is selected to be lower than the pressure of the compressed air source and to allow the air dryer to function efficiently, for example, about 3 to 8 kg / cm ² .

The air dryer cools the compressed air from the first regulator to remove moisture contained in the compressed air.

The compressed air from which moisture has been removed by the air dryer is subjected to the second stage depressurization by the second regulator.

The set pressure of the second regulator is selected to be, for example, about 0.1 to 0.5 Kg / cm ² according to the viscosity of the coating agent.

The pressure vessel contains the coating agent, and the coating agent is pressure-fed by the compressed air from the second regulator.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

1 (a) and 1 (b) are fluid circuit diagrams of the pressure feeding system 3 according to the present invention. In this example, a case where the black primer BP is pressure-fed as a coating agent will be described.

The pressure feeding system 3 includes an adjusting unit 81 for supplying clean air whose pressure is properly adjusted, and a supplying unit 82 for supplying the black primer BP by the pressure of the air.

The adjusting unit 81 includes a receiving port 83 through which air is input from a compressor (not shown), an auto drain type filter 84,
Regulator 85, pressure gauge 86 for coarse adjustment of pressure,
Air dryer 87 for removing moisture and water, regulators 88, 92 and pressure gauge 89, for fine adjustment of pressure in normal air line LN1 and cleaning air line LN2, respectively.
93, stop valves 90, 94, and a switching valve 91 for switching air from both air lines LN1, 2 and the like.

The supply section 82 is a solvent tank containing the solvent SE for curing.
95, stop valve 96, pressure gauge 97, and primer tank
It is composed of a pressure feeding device 80 having 98.

The air dryer 87 lowers the temperature of the high-temperature air that is input, discharges and removes condensed water, and lowers the dew point to, for example, about minus 70 degrees C to prevent dew condensation on subsequent lines. Centering on the exchanger,
It has a known structure in itself including a prefilter, a final filter, an automatic drainer and the like.

However, by using this air dryer 87,
There is no risk that the black primer BP will react with water to cure, and there is no need for special piping for nitrogen gas as in the conventional case of using high-pressure nitrogen gas, so the pressure difference is small and precise. The pressure can be adjusted,
Air without pressure fluctuation can be added to the subsequent primer tank 98 to make the pumping flow rate of the black primer BP constant, and it is not necessary to replace the conventional high pressure tank filled with nitrogen gas. In addition, since the flow rate required for applying the black primer BP is small, a small air dryer 87 can be used, and it fits compactly.

As shown in FIG. 1 (b), the solvent tank 95 is a cylindrical tank body 111 sealed with a lid 112. The solvent SE is pressurized by the air pressure from the air line LN5 and the solvent line LN7 from the solvent line LN7. Send SE. Also, the solvent tank 9
The air that has entered the inside 5 flows out from the air line LN6 and flows into the primer tank 98. When the solvent SE is insufficient, the solvent SE is put into the hopper 113, and the stop valve 96 is opened to replenish it. 114 is a safety valve.

FIG. 2 is a sectional front view of the pressure feeding device 80 used in the pressure feeding system 3 of FIG.

In FIG. 2, the primer tank 98 is the tank body.
It is composed of 116 and lid 117.

The tank body 116 is configured by integrally forming a bottom plate 115 and a tube 116a by screws or welding, and an opening 116b at an upper portion of the tank body 116 is detachably attached to a lid 117 by a clamp device 118, 118 .... It is hermetically sealed.

A pedestal 119 made of synthetic resin or the like is removably placed on the bottom plate 115, and a cartridge-type primer container 127 filled with black primer BP has a cap on the pedestal 119. In the detached state, the inner peripheral surface 127a of the bottom portion is positioned and placed such that it fits into the outer peripheral surface 119a of the convex portion of the pedestal 119.

The lid 117 has a primer line LN via the connector 121.
8 is connected to the pipe 122 and the liquid amount detection sensor 99,
It is attached in a hermetically sealed state by screw type bushes 120 and 123, respectively. The primer tank 98 is attached to the attachment plate 3a of the coating agent supply device 3 via an attachment fitting 128 with a bolt (not shown) or the like.

Next, the operation of the pressure feeding system 3 configured as described above will be described.

The pressure of each part of the fluid circuit is adjusted by the regulator 85.
To 7Kg / cm ^2, about by the regulator 88 0.1~0.5Kg / cm ²
Further, it is adjusted to about 2 kg / cm ² by the regulator 92, respectively. The switching valve 91 is normally the air line LN1
Is in a position to connect with the air line LN5. Change valve 101
Is at a position connecting the primer line LN8 with the supply line LN9.

About 10 Kg / cm ² of air from the compressed air source should be filtered.
84 removes dust and foreign substances and cleans
The pressure is reduced to about 7 Kg / cm ² by the regulator 85. Thereafter, the air dryer 87 cools as described above and removes water. Then regulator 88
The pressure is reduced to about 0.1 to 0.5 Kg / cm ² , passes through the solvent tank 95, and flows into the primer tank 98 from the air line LN6 via the connector 126. As a result, the pressure in the primer tank 98 rises and the liquid surface of the black primer BP filled in the primer container 127 is pressed. Then, the black primer BP is pressure-fed from the primer line LN8 via the pipe 122.

The liquid amount detection sensor 99 has a thermistor enclosed at its tip (lowermost end), and a constant current is supplied to the thermistor from the lead wire 125. The temperature of the thermistor changes depending on the presence or absence of the black primer BP. It is configured to be detected as a change in resistance value due to a change. The liquid amount detection sensor 99 detects that the black primer BP in the primer container 127 has become empty.

When the black primer BP in the primer container 127 becomes empty, the air from the air line LN6 is stopped to release the pressure in the primer tank 98, and then the clamp device 118
Is operated to remove the lid 117, and replace it with a new primer container 127 which is filled with the black primer BP and is well shaken and stirred to prevent the precipitation.

Therefore, it is extremely easy to replenish the primer tank 98 with the black primer BP, and it is possible to use the one in which the black primer BP is not settled by shaking each time the primer container 127 is replaced. The volume of the primer container 127 is set to 1 in the pumping system 3.
Primer container 12 by adjusting it to the appropriate amount according to the daily usage amount and shaking it well when exchanging
The black primer BP in 7 is used up by the time sedimentation occurs, and there is no need to repeat the shake. In addition, even if the black primer BP remains in the primer container 127 and is not used for a long time, the primer container
Since 127 can be easily taken out from the primer tank 98 and shaken, the concentration of the black primer BP pressure-fed from the primer line LN8 becomes uniform, which is extremely convenient for the coating in the subsequent step and a dark solution of the black primer BP. Does not remain at the bottom of the primer container 127 and become uneconomical. Since the inside of the primer tank 98 is hardly soiled, cleaning is easy. Pedestal 119
Since is made of synthetic resin, it is easy to wash.

In addition, in FIG. 1 (b), the primer line LN8
Black Primer BP and solvent line LN7 sent by pressure from
The solvent SE that is pressure-fed from is sent by the switching valve 101 to the pilot-type switching valve 102, and the electromagnetic switching valve 103 is switched,
The black primer BP is supplied to the port 67 of the coating agent supply jig 12 that requires the black primer BP via the supply line LN9. Further, the air supplied by the air line LN3 is input to the switching valve 103 described above, and is also input to the parallel opening / closing drive chuck 14 of the load via the regulator 104 and the electromagnetic switching valve 105, and the switching valve 105 is The parallel opening / closing drive chuck 14 is opened / closed by being on / off controlled.

To clean the change valves 101, 102 and the coating agent supply jig 12, the switching valve 91 is switched to clean the cleaning air line LN2.
Is connected to the air line LN5, and the exchange valve 101 is switched to connect the solvent line LN7 to the supply line LN9.

As a result, the solvent SE in the solvent tank 95 is pressurized at a high pressure and flows into equipment such as the replacement valves 101 and 102, and the black primer BP, etc. adhering to the equipment is cleaned, preventing clogging and malfunction. To be done. Further, the primer line LN8 can be washed by replacing the primer container 127 in the primer tank 98 with a container containing the solvent SE.

In the above-mentioned embodiment, the fluid circuit of the pumping system 3 can be variously modified. For example, if the filter 84 is replaced by a two-stage structure including a coarse mesh filter and a fine mesh filter, cleaner air can be obtained. Also, a switching valve for relief may be provided in the middle of the air line LN5. The set pressure by the regulators 85 and 88 can be changed variously. Regulator 3
It may be more than steps. The pumping device 80 may have another structure. It can be applied to various coating agents other than the black primer BP.

In the above embodiment, the bushes 120 and 123 are of the screw type, but may be of the welding type. A socket or a flange may be used instead of the connector 126. Although the inner peripheral surface 127a of the primer container 127 and the outer peripheral surface 119a of the pedestal 119 are configured to be fitted to each other, the present invention is not limited to this. Various types of clamp devices 118 can be used.
The structure, shape, arrangement, material, etc. of the other constituent members can be various other than those described above.

〔The invention's effect〕

According to the present invention, since the pressure difference is small, precise pressure adjustment is possible, pressure gas without pressure fluctuation can be added to the pressure vessel, the pressure-feeding flow rate of the coating agent is constant, and high pressure as in the conventional case There is no need for a high-pressure tank because no tank is required.

Moreover, the dew point can be lowered by the air dryer, which eliminates the risk of curing the coating agent, and does not require special piping for nitrogen gas as in the past, and replaces the conventional high pressure tank. A small air dryer can be used, so it fits compactly.

[Brief description of drawings]

The drawings show an embodiment of the present invention, which is shown in FIGS. 1 (a) and (b).
2 is a fluid circuit diagram of the pressure feeding system, and FIG. 2 is a sectional front view of the pressure feeding device used in the pressure feeding system of FIG. 3 ... pressure feeding system, 85 ... regulator (first regulator), 87 ... air dryer, 88 ... regulator (second regulator), 98 ... primer tank (pressure container), BP ... black primer (coating agent) ).

Claims (1)

[Claims] 1. A pressure-feeding system for pressure-feeding a coating agent by a pressure gas, comprising: a first regulator for reducing the pressure of compressed air from a compressed air source; and moisture contained in the compressed air from the first regulator. And a second regulator for decompressing the compressed air from the air dryer, and a pressure vessel for pumping the coating agent by the compressed air from the second regulator. Pumping system.