JPS6146181B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coating agent supply device used in a coating device for cement mortar molded products.

[Conventional technology]

Conventionally, it has not been possible to obtain high-quality coating agents for cement mortar press molded products. A slurry coating agent that is adaptable to the surface of a molded product that has solidified but is not stable with respect to moisture is
In particular, the moisture content is delicate and must be relatively low. Therefore, the coating agent tends to harden and clog the coating equipment. Particularly sensitive to atmospheric temperature. If temperature changes are ignored, the cement will harden in the summer and will have a negative effect on the reaction of the cement, making it necessary to frequently shut down the coating equipment and thoroughly clean it.

A coating agent supply device having a temperature control device is disclosed in Japanese Utility Model Publication No. 56-24990, Japanese Patent Application Laid-Open No. 51-103948,
This method is known from Japanese Patent Application Laid-open No. 78243/1983. However, all of these devices use heated paints with low viscosity, and the tank and temperature-regulating medium container are separate, or a pump is used to draw the paint upward using a valve. Because it is simply sent out by gravity, it cannot be used as a slurry coating agent for coating cement mortar molded products that have little water content and harden easily.

[Problem that the invention seeks to solve]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a simple and effective coating agent supplying device suitable for coating cement mortar molded products that can withstand long-term use and optimize coating agent supply and coating. do.

[Means for solving problems]

In order to achieve the above object, the present invention provides a metering pump as an outlet at the lower end of a paint tank having a cylindrical upper part and a conical lower part, and a cylindrical temperature regulating medium circulation muffler surrounding this tank. An object of the present invention is to provide a coating device for a cement mortar molded product, which is characterized in that it is enclosed.

[Effect]

Since the present invention has the above configuration, it is possible to reliably deliver an appropriate amount of relatively high viscosity material by adjusting the position of the tank outlet and the delivery device, reducing clogging and the number of times of cleaning, and also reducing the need for tank and muffler. Although the arrangement and shape are simple, the material can be reliably maintained at the appropriate temperature. The tank has a conical shape near the tank outlet, and the material in that area is decreasing, but the muffler has an increased media storage capacity in this area, so the temperature of the paint at the tank outlet is lower than that of the medium in the muffler. It can be said that the temperature is approximately equal to that of 100 mL, and it has been possible to provide a coating material supply device that is extremely suitable for storing and supplying materials that have high viscosity and are easily solidified.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a coating agent supply device suitable for coating cement mortar molded articles that can withstand long-term use and maintain the effectiveness of the coating agent.

In order to achieve the above object, the present invention provides a coating for use in a coating apparatus for cement mortar molded products, characterized in that a coating agent tank having an outlet communicating with a pump at the lower end is surrounded by a muffler for circulating a temperature regulating medium. The present invention provides a drug supply device.

Use of the above equipment improves the workability of paints containing cement, whose curing time varies depending on the temperature. Normally, the pot life of cement slurry is 30
Whereas it takes about 1 hour and 30 minutes with this device,
A pot life of about minutes can be obtained. When using a paint with relatively low water content, the paint tends to adhere to the inner wall of the tank and become unusable, but cooling can cause the water in the paint to condense on the inside of the tank, causing the paint to slip. Become. In the winter, hot water can be circulated to prevent freezing, which inhibits cement reaction and flow.

〔Example〕

In the following, features of the invention will be explained in more detail with reference to the accompanying drawings, which illustrate embodiments of the invention.

Figure 1 shows a cylindrical tank 1 with a cylindrical upper part and a conical lower part that stores slurry as a coating agent.
4 is shown, this tank 14 is supported by a machine frame 21, a rotating shaft 15 passes vertically through the center, and is rotatably supported above and below the tank. The upper end of the rotary shaft 15 is connected to the drive shaft of a rotary motor 13, which is preferably continuously variable speed and is mounted on the machine frame 21 above the tank 14. The lower end of the tank 14 also terminates in a pump 16. Although it is possible to use a helical diaphragm pump as the pump 16, it is preferable to use a monopump in which a single threaded shaft 22 rotates eccentrically inside a double threaded sleeve provided in the stator. Good. A rotating shaft 15 passing through the tank 14 is connected to a mono pump 16.
It is connected to a screw shaft 22 of. A stirring blade 17 is attached to the lower part of the rotating shaft 15 to maintain uniformity of the coating agent and improve heat transfer. The stirring blade 17 may not be provided. (See Figure 2). Since the concentration and viscosity of the paint used are easily affected by temperature, the outer periphery of the tank 14 is surrounded by a cylindrical muffler 19 that surrounds at least the center and lower part of the tank, and a thermally conductive medium (i.e., water) is placed in the lower part. ) Inlet 23 and outlet 24 at the top
is installed to keep the temperature of the paint constant by circulating hot water in the winter and cooling water in the summer.

An outlet 25 at the lower end of the pump 16 is connected to a slurry coating gun 18 . The slurry coating gun 18 has a coating agent supply chamber 26 at the front (on the right side of the drawing).
It has a paint injection port 27 at the tip of the paint supply chamber 26, and a paint inlet at the other end, which communicates with the outlet 25 of the pump 16 through a flexible connecting pipe. . A cylindrical sliding tube 28 passes through the axis of the slurry coating gun 18 , extends inside the coating agent supply chamber 26 at the front of the gun, and has its front end aligned with the coating agent injection port 27 . The sliding tube 28 is a supply tube for injection gas, that is, air, and its tip is formed into a tapered shape, and the inner wall of the paint injection port 27 of the gun casing is also tapered, and the material is moved through the sliding tube 28 and injected. When connected to the opening 27, the coating agent supply chamber 26 is blocked from the coating agent injection port 27. The rear end of the sliding tube 28 passes through the rear part of the gun casing and projects from the rear end of the gun. The rear end of the sliding tube 28 is connected to an air source 30 via an injection gas on-off valve 29 which is preferably a 1-port, 1-position normally closed type solenoid valve. A cylinder chamber 31 for operating the sliding tube 28 is formed at the rear of the gun, and an operating piston 32 that is fitted and fixed around the sliding tube 28 slides in the cylinder chamber 31.
An O-ring 33 provides a seal between the wall of the cylinder chamber 31 and the piston 32. A sliding pipe 28 is provided on the wall separating the cylinder chamber 31 and the paint supply chamber 26.
There is a through hole 34 for guiding the chamber, and both chambers are sealed by an O-ring 35. A working gas inlet 36 is provided at the inner end of the cylinder chamber 31, and is connected to a working air source via a switching valve 37 which is preferably a 2-port, 2-position normally closed type solenoid valve. The outer end of the cylinder chamber 31, that is, the rear end of the gun casing has a return spring 3 between the end wall and the piston 32.
Place 8. A threaded opening 40 coaxial with the sliding tube 28 is provided in the end wall, and the sliding tube 2 is inserted into the center of the opening 40.
An adjustment screw 41 having an opening 39 through which the piston 32 passes is screwed on, thereby making it possible to adjust the end position of the piston 32, that is, the retracted position of the sliding tube 28, thereby adjusting the amount of paint supplied at the paint injection port 27. is adjustable. Although the sliding tube 28 and the opening of the adjusting screw 41 may be brought into sliding contact, a gap may be provided. If sliding contact is to be made, air relief openings 42 are required in the end walls. An annular muffler 43 is attached and fixed around the front end of the painting gun 18, and the inner wall of the tip of the annular muffler 43 surrounds the injection port 27, and an annular injection gas chamber 44 is provided inside the tip of the muffler 43 through a diameter. Openings 45 facing diagonally forward and inward from the injection gas chamber 44 are provided at two locations. The muffler 43 also includes an inlet 47 that communicates the air source 30 with the propellant gas chamber 44 via a one-port normally closed solenoid valve 46 . Air is supplied to this muffler 43 through two openings 45 that oppose each other via the diameter.
Creates more intersecting airflow forward, creating a paint spray pattern.

A cleaning gun 48 injects a cleaning agent toward the tip of the slurry coating gun 18a. The illustrated cleaning device or cleaning gun 48 has a cleaning agent supply passage 49 on its axis, and four or six cleaning agent supply passages arranged parallel to the supply passage 49 at equiangular intervals around the axis.
A main injection gas supply path 50 is provided, and a gun tip opening 5 is provided.
The inlet opening 52 at the other end of the cleaning agent supply path 49 and the common inlet opening 53 of the cleaning agent wiping injection gas supply path 50 are connected to the cleaning agent supply path 49 near 1, and each has a 1 port 1 position normally closed type. are connected to a cleaning agent tank 56 and an air source 30 via solenoid valves 54 and 55, respectively. The cleaning agent tank 56 stores cleaning agents such as alcohol, water, and thinner.

The operation of the coating apparatus having the above structure will be described below.

Simultaneously with the rotation of the motor 12 that drives the coating device, the solenoid valves 29, 37, and 46 operate, and the coating gun 16
The communication between the coating agent injection port 27 and the coating agent supply chamber 26 and the injection of the injection gas for conveying the coating agent and the pattern forming gas are started. The injection is stopped by stopping the motor and closing the opening of the paint supply chamber 27.
Since the motor 12 is of a continuously variable speed type, it is possible to adjust the supply amount of the coating agent and the spray amount of the coating gun. The injection of the pattern forming gas and the injection of the coating agent injection gas are continued even after the injection of the coating agent is stopped, and the coating agent is peeled off from the tip of the coating gas, particularly around the injection port 27. Paint the molded product at the painting position,
When this one coat of coating is completed and the operation of the coating gun is stopped, the coating gun is left in the same position or rotated to the cleaning position. When the cleaning device is activated, the cleaning agent supply solenoid valve 65 is activated, and the cleaning agent collides with the front end of the coating gun in the cleaning position, causing the paint to scatter. The jetting power of the cleaning agent can be increased by operating the injection gas supply solenoid valve 66 at the same time as the cleaning agent is supplied, but when the cleaning agent can be sprayed with just the internal pressure of the cleaning agent tank and the wide spread of the cleaning agent becomes an obstacle. The propellant gas is not used to transport the cleaning agent.
After the supply of the cleaning agent is stopped, the solenoid valve 66 is operated to supply a jet of gas to the coating gun to wipe off the cleaning agent, thereby scattering and drying the cleaning agent present at the top of the painting gun.

Of course, when starting the supply of the cleaning agent and the injection gas at the same time, it is sufficient to stop the supply of the cleaning agent and then continue supplying only the injection gas. After stopping, one cycle of the painting gun ends either as it is or by moving from the cleaning position to the painting position. Of course, the cleaning method is not limited to the above-mentioned method or apparatus, and depending on the properties of the coating material or the condition of the object to be coated, cleaning may be carried out after a certain period of operation has been completed.

Figure 2 is a system diagram of the heat transfer medium of the temperature control muffler 19, where 81 is a water bottle and 82 is a 50 cycle.
35 circulation pumps, 8 with 25 or 60 cycles
3 is a check valve that prevents backflow of fluid, 84 is a water cooling system, three-phase 200V, 1000W at 50 cycles, or 1200W at 60 cycles, 1700-1900Kca.
It is preferable to use one having a cooling capacity of 1/h, and when the temperature is 25°C, the inside of the apparatus can be maintained at a low temperature of 5°C to 20°C. The water cooled by the water cooling device 84 is introduced into the muffler 19 of the first paint supply device through a path 85, passes through the mufflers of the paint agent supply devices connected in series, and then passes through the path 88 to the pump 82.
will be returned to. 89 is a water level gauge installed in the return path 88. Near the water level gauge, a branch pipe 90 whose upper part is open to the atmosphere is connected, and below the top, it is connected to an overflow pipe, so that the pressure inside the pipe becomes atmospheric pressure. Therefore, it is naturally adjusted. The overflow water can be used as water for preparing coating agents. In winter, water is warmed and circulated by a boiler to prevent raw materials from freezing. This is especially necessary in cold regions, where increasing the temperature to about 10° C. makes a suitable coating supply device work.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram and an operation system diagram of a coating device having one embodiment of the coating agent supply device of the present invention;
FIG. 2 is a schematic diagram showing a coating agent supply device as another embodiment of the present invention, and shows a temperature regulating medium circulation system. 13... Rotating motor, 14... Tank, 16...
...Pump, 19...Muffler for temperature control.

Claims (1)

[Claims] 1. A metering pump is installed at the lower end of the paint tank, which has a cylindrical upper part and a conical lower part, and serves as an outlet.
A coating agent supply device for use in a coating device for cement mortar molded products, characterized in that the tank is surrounded by a cylindrical muffler for circulating a temperature regulating medium.