JPH0143581B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coating device that conveys and applies paint using a propellant gas, and particularly relates to a spray nozzle and a cylinder that connects the nozzle to a paint supply chamber. chamber, and a sliding tube that is provided concentrically in the cylindrical chamber and has an injection gas supply passage on its axis, and the tip of the sliding tube contacts the injection port to connect the injection port and the coating. The present invention relates to a coating device that is configured to reciprocate between a position where communication with a coating agent supply chamber is cut off and a position where the injection port is retracted from the injection port and communicated with the coating agent supply chamber.

[Prior Art] Such a device is known from Japanese Utility Model Application No. 55-130770. However, in such a device shown therein, the injection gas supply passage of the sliding tube communicates with the sliding tube working cylinder chamber on its supply side, and diverts the sliding tube working fluid in the cylinder as the injection gas. ing. Therefore, the supply of injection gas and the operation of the sliding tube are interrelated, making it difficult to adjust each, and the structure of the sliding tube itself is relatively complicated.

[Problem to be solved by the invention]

Therefore, an object of the present invention is to provide a simple structure that enables appropriate painting and wiping of the paint by freely adjusting the timing of supplying and stopping the paint agent and the firing and stopping timing of the jet gas for spraying the paint. The purpose of the present invention is to provide a coating device.

[Means of problem solving]

In order to achieve such an object, the present invention provides that the rear part of the sliding tube penetrates the cylinder chamber that operates the sliding tube, and the rear end protrudes from the rear end of the casing of the coating device, and the injection gas is supplied at the rear end. It is an object of the present invention to supply the coating device described in the opening paragraph, wherein the passage is connected to an air source via an on-off valve independent of a switching valve for supplying working fluid that communicates with the working cylinder chamber. be.

[Action and effect]

As mentioned above, although the sliding tube performs both the functions of opening and closing the paint nozzle and supplying the injection gas, the injection gas supply passage and the passage of the working medium of the sliding tube are unrelated to each other. The injection gas supply passage is a straight path along the axis of the elongated sliding tube, so the injection gas can be injected only after the sliding tube is actuated to completely open the injection port. The injection of the propellant gas can be continued even after the injection port is started or the injection port is closed, and a propellant gas supply passage with a simple structure can be provided.

〔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.

The drawing shows a cylindrical tank 14 for storing slurry as a coating agent, and this tank is connected to the machine frame 21.
The rotating shaft 15 passes through the center perpendicularly,
It is rotatably supported above and below the tank.
The upper end of the rotating shaft 15 is above the tank 14 and the machine frame 2
Rotary motor 1 suitable for continuously variable speed attached to 1
It is connected to the drive shaft of No. 3. The lower end of the tank 14 also terminates in a pump 16. This pump 16
Although it is possible to use a helical diaphragm pump, it is preferable to use a monopump in which a single threaded shaft 22 rotates eccentrically in a double threaded sleeve provided in the stator 34. . A rotating shaft 15 passing through the tank 14 is connected to a threaded shaft 22 of the Mono pump 16. 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. 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 muffler 19, and a thermally conductive medium (i.e., water) inlet 23 is provided at the bottom, and an outlet 24 is provided at the top. The temperature of the paint is kept 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 paint gun 18 has a paint agent supply chamber 26 at the front (right side in the drawing), and a paint agent injection port 27 at the tip of the paint agent supply chamber 26.
The other end has a coating agent inlet and communicates with the outlet 25 of the pump 16 through a flexible connecting pipe. An elongated cylindrical sliding tube 28 passes through the axis of the coating gun 18, and a supply passage 28a for injection gas, that is, air, passes through the sliding tube 28 between the front end 28b and the rear end 28c on the shaft. There is. This sliding pipe 2
8 extends inside the paint supply chamber 26 at the front of the gun, and its front end 28b is aligned with the paint 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. Mouth 2
7, the coating agent supply chamber 26 is blocked from the coating agent injection port 27. Rear end 2 of sliding tube 28
8c passes through the rear part of the gun casing and protrudes from the gun rear end 18a. And this sliding pipe 2
The rear end 28c of 8 is an injection gas opening/closing valve 29 which is preferably a 1-port 1-position normally closed type solenoid valve.
It is connected to an air source 30 via. 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. A seal between the wall of the cylinder 31 and the piston 32 is provided by an O-ring 33. A through hole 34 for guiding the sliding tube 28 is provided in the wall separating the cylinder chamber 31 and the paint supply chamber 26, 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 38 between the end wall 18a and the piston 32.
to be placed. The end wall 18a is provided with a threaded opening 40 coaxial with the sliding tube 28, and an adjusting screw 41 having an opening 39 through which the sliding tube 28 passes through the center of the opening 40.
are screwed together to make it possible to adjust the end position of the piston 32, that is, the retracted position of the sliding tube 28, thereby making it possible to adjust the amount of paint supplied at the paint injection port 27. 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, an air escape opening 42 is required in the end wall 18a. 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 has one port and one air source 30.
An inlet 47 is provided which communicates with the injection gas chamber 44 via a normally closed type solenoid valve 46 . The air supplied to this muffler 43 forms intersecting air flows forward through two diametrically opposed openings 45, forming a paint spray pattern.

A cleaning gun that sprays a cleaning agent toward the tip of the coating gun 18 is indicated by 48. Illustrated cleaning gun 4
8 is provided with a cleaning agent supply path 49 on the axis, and provided with, for example, four or six injection gas supply paths 50 parallel to the supply path 49 arranged at equal angular intervals around the cleaning agent supply path 49, and has a gun tip opening 51. The inlet opening 52 at the other end of the cleaning agent supply path 49 and the common inlet opening 53 of the injection gas supply path 50 are each connected to a 1-port, 1-position normally closed type solenoid valve 54, which communicates with the cleaning agent supply path 49 in the vicinity. 55 to a cleaning agent tank 56 and an air source 30, respectively. A cleaning agent tank 56 stores cleaning agents such as alcohol and water thinner. Separate electromagnetic valves 54 and 55 are provided so that the supply operation is performed simultaneously, but the supply of cleaning agent is first stopped and only the injection gas is injected toward the coating gun head for a certain period of time. The supply amount of the propellant gas may be small, and the supply of the cleaning agent may depend solely on the tank internal pressure, or the substantial supply of the propellant gas may be started after the supply of the cleaning agent. The spraying of the cleaning agent is particularly important for cleaning the patterning spray gun orifice, as well as cleaning the coating agent orifice and its surroundings.
The coating gun head can be dried by injecting the cleaning agent jet gas for a certain period of time even after the cleaning agent supply is stopped.

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

When the coating device is driven, the solenoid valves 29, 37, and 46 operate simultaneously with the rotation of the motor 13, and the coating gun 1 is activated.
The communication between the coating agent injection port 27 of No. 8 and the coating agent supply chamber 26 and the injection of the coating 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 13 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. At the same time, the cleaning agent is injected from the front of the coating gun toward the leading end, and intersects with the gas, ie, air, injected from the coating gun, thereby completing the removal and cleaning of the coating agent. Since the paint supply chamber and the injection port are shut off, these jet gases do not affect the paint during this time.

[Brief explanation of drawings]

The drawings are a schematic diagram and an operation system diagram of the coating apparatus of the present invention. 26...Painting agent supply chamber, 27...Painting agent injection port, 29...Opening/closing valve, 37...Switching valve.

Claims (1)

[Claims] 1. Includes an injection port, a cylindrical chamber that connects the injection port to a paint supply chamber, and a sliding tube that is provided concentrically with the cylindrical chamber and that slides and has an injection gas supply passage at its axis,
A position where the tip of the sliding tube contacts the injection port and cuts off communication between the injection port and the paint supply chamber, and a position where the tip of the sliding tube retreats from the injection port and communicates the injection port with the paint supply chamber. In the painting device, the rear part of the sliding tube passes through the cylinder chamber for operating the sliding tube, and the rear end protrudes from the rear end of the casing of the painting device, and at this rear end, the sliding tube moves back and forth between the The painting device characterized in that the injection gas supply passage is connected to an air source via an on-off valve independent of a switching valve for supplying working fluid that communicates with the working cylinder chamber.