JPH0787908B2 - Paint color change device for painting machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a paint color change for a painting machine for changing a paint to be applied to another paint having a different color when the paint is applied using one spray gun. Regarding the device.

2. Description of the Related Art Problems to be Solved by the Related Art and Invention Conventionally, as one of the paint color changing devices for a coating machine, a valve that opens to a paint supply passage on a base body on which a paint supply passage connected to a spray gun is formed. A plurality of housings having accommodating chambers with mouths are attached, and in the accommodating chambers of each housing,
The valve body that opens and closes the valve opening by opening and closing the valve seat is urged by the spring force in the valve closing direction, and the valve rod fixed to the valve body is attached to the piston fitted in the cylinder in the storage chamber. The valve rod and the valve body are connected together to move the valve rod and the valve body together with the piston by supplying air into the cylinder to separate the valve body from the valve seat to open the valve, and to open any one of them. In order to drive the paint with a desired color paint to the spray gun by supplying it to the spray gun, the conventional device uses an on-off valve mechanism consisting of a valve body and a valve seat and to drive it. Since the valve rod and the actuator mechanism consisting of the piston were integrally assembled in the common storage chamber, when replacing or repairing the parts of either the on-off valve mechanism or the actuator mechanism, only one of them should be used. Without others Mechanism even summer and decomposing simultaneously, extra time and effort has been made drawback related to the disassembly and assembly work on the subsequent body.

Means for Solving Problems As a means for solving the above problems, the paint color changing device for a coating machine according to the present invention is a substrate having a paint supply passage connected to an introduction passage leading to a nozzle of a spray gun. A plurality of pairs of accommodating chambers are formed at two positions sandwiching the paint supply path, and one of the accommodating chambers of each pair always makes the valve element abut against the valve seat by a spring force. An opening / closing valve mechanism is provided in which the valve opening that opens to the paint supply passage is closed by the above, and the valve opening is opened by separating the valve body from the valve seat by pressing from the paint supply passage side. In the other side of the pair of accommodating chambers, the spring force always causes the operating rod fixed to the piston fitted in the cylinder to have the tip of the operating rod facing the paint supply path the valve in the closed state of the on-off valve mechanism. While being kept in a state of being separated from the body and corresponding to it, An actuator mechanism is provided in which the piston and the operating rod are moved by the supply of air into the cylinder so that the tip of the operating rod crosses the paint supply path and presses the valve element in the valve opening direction.

In the above structure, a closing member for closing the opening from the storage chamber to the paint supply passage may be attached, and the base body and the components of the opening / closing valve mechanism and the actuator mechanism may be made of synthetic resin, ceramics, or the like. It may be made of a non-conductive material, and may be attached to a spray gun for electrostatic coating in which a high voltage applying electrode is attached to a nozzle.

The operation and effect of the present invention has the above-described structure, and when air is supplied to any one actuator mechanism and its actuating rod presses the valve body of the corresponding on-off valve mechanism to open the valve, it is opened. The paint of the desired color is guided from the valve opening to the paint supply path and ejected from the nozzle through the spray gun introduction path, and when painting with a color different from this paint, air is supplied to the actuator mechanism. Stop the valve body by releasing the pressure on the valve body by the operating rod to close the open / close valve mechanism, and wash the paint flow path from the paint supply path of the substrate to the nozzle of the spray gun with a solvent, then By opening the other on-off valve mechanism corresponding to it by supplying air to the actuator mechanism of, the other paint of a color different from the previous paint,
When the spray gun is guided to the paint supply passage and ejects from the spray gun, an opening / closing valve mechanism for opening and closing the inlet of each paint to the paint supply passage and an actuator mechanism for operating the opening / closing valve mechanism are separated from each other. Since it is provided in the above, when replacing or repairing any one of the mechanisms, unlike the conventional device in which both mechanisms have to be disassembled, only one of the necessary mechanisms needs to be disassembled, There is an effect that the disassembling work and the subsequent assembling work can be easily performed in a short time without requiring extra labor.

If the number of types of paint actually required for painting work is less than the maximum number of open / close valve mechanisms that can be installed on the base, replace the surplus open / close valve mechanism with a closed body. Of course, this has the advantage that it can be used in common without preparing the same number of substrates as the number of on-off valve mechanisms.

Also, the base body and the components of the on-off valve mechanism and actuator mechanism are made of non-conductive material such as synthetic resin and ceramics, and are attached to the spray gun for electrostatic coating in which the nozzle is equipped with electrodes for applying high voltage. In this case, internal sparks due to the components do not occur when a discharge is caused by a high-potential electrostatic field, unlike the conventional device using components made of a conductive material such as metal. , It is possible to prevent the life of components from being shortened by internal sparks, and to prevent noise caused by internal sparks from adversely affecting the control device. There is an effect that the weight can be reduced.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the drawing, reference numeral 1 is an air spray gun for electrostatic coating, which is provided in the middle of an introduction path 5 for guiding the coating material supplied from a color changing unit 2 which will be described later in detail to a coating material ejection port 4 of a nozzle 3. When the open / close valve 6 is opened by the operation of an actuator (not shown), the paint supplied from the color changing unit 2 is negatively charged by the electrode 8 connected to the high voltage applying resistor 7 housed in the spray gun 1. It is jetted from the paint jet port 4 in a state of being charged, and atomized by the repulsive action of the static electricity and the jet of high-pressure air jetted from the paint atomizing air jet port 9 of the nozzle 3 to carry this negative charge. The finely divided paint is applied to an object to be painted (not shown) that is positively charged, so that the paint is applied.

The color-changing unit 2 is composed of a non-conductive synthetic resin base 11 having a projection 12 for connecting to the spray gun 1 formed on the front end surface. The base 11 has only the front end surface of the projection 12. One paint supply path 13 that opens in the front is formed in the front-rear direction, and an on-off valve mechanism 15 that forms a pair with the paint supply path 13 in between and an actuator mechanism 16 that drives the on-off valve mechanism 15 to open and close.
However, a plurality of pairs are provided in a state of being arranged in the front-rear direction.

The opening / closing valve mechanism 15 is housed in a housing chamber 18 formed in the base body 11 by opening to the side surface and the paint supply passage 13, and the housing chamber 18 has a cylindrical shape and an inner circumference of the tip portion. A housing 20 having a conical valve seat 21 formed in a state in which a tapered surface 22 on the outer periphery of the tip end thereof is locked to a tapered surface 23 formed at the rear end opening to the paint supply passage 13 of the storage chamber 18. The connector 25, which is fitted with the connector and is formed with a connection hole 26 formed of a female screw connected to a paint pressure-feeding source or a solvent pressure-feeding source and a paint inflow passage 27 reaching the tip surface from this connection hole 26, has its tip. The positioning pin 30 is inserted in a state where the portion is inserted into the housing 20, and the projection pin is projected from the bottom of the base 11 to the tip of a bolt 29 that is screwed upward. By fitting into the positioning grooves 31, 32 which are recessed so as to be aligned with the outer circumference, The housing 20 and the connector 25 are fixed in the housing chamber 18. housing
A spherical valve body 35 that opens and closes a valve port 34 that opens to the paint supply passage 13 by being brought into and out of contact with the valve seat 21 is fitted in the hollow of 20 and is locked to the tip surface of the connector 25. Therefore, a compression coil spring 36 for urging the valve element 35 in the direction of abutting the valve seat 21 is mounted, and the urging force of the compression coil spring 36 always causes the valve element 35 to abut the valve seat 21. The opening 34 is configured to be closed, and the valve body 35 is pressed from the paint supply passage 13 side to separate from the valve seat 21 to open the valve, so that the connection hole 26 of the connector 25 is closed. ,housing
It is adapted to communicate with the paint supply passage 13 through the hollow of 20 and the open valve port 34, and in the opening / closing valve mechanism 15 having such a configuration, the compression coil spring 36 is non-conductive, In addition to being molded by ceramics, the components other than the compression coil spring 36 are non-conductive and molded by synthetic resin.

The actuator mechanism 16 is accommodated in the accommodation chamber 38 formed in the base 11 so as to correspond to the accommodation chamber 18 of the opening / closing valve mechanism 15 with the paint supply passage 13 interposed therebetween and to have the axis line with the accommodation chamber 18. The ring-shaped cylinder 40 is screwed into the stepped portion at the rear end of the large diameter portion 39 and the female screw 43 of the large diameter portion 39 in the large diameter portion 39 that is open to the side surface of the base 11 of the housing chamber 38. It is fixed while being sandwiched between the combined tightening body 44 and the housing chamber 38.
A piston 47, which is formed by fixing an operating rod 45 projecting to the rear end side of the cylinder with a nut 46, is fitted to the inner circumference of the cylinder 40 so as to make airtight sliding contact, and the piston 47 and the tightening body 44 are A pressure chamber 48 formed by the circumference is communicated with an inflow hole 50 of a connector 49 which is screwed to the tightening body 44 and connected to a compressor (not shown). Further, a seal body 51 is fitted in the rear end side of the storage chamber 38, and the operating rod 45 has a tip portion thereof, and a central hole 52 of the seal body 51 and the storage chamber 38 are connected to the paint supply path 13.
It is made to penetrate into the paint supply path 13 by penetrating to the outflow hole 53 that is opened to, and the compression coil spring 55 is mounted between the seal body 51 and the end surface of the piston 47, and always,
The piston 47 is tightened by the elastic force of the compression coil spring 55.
While contacting the end surface of the pressure chamber 48 to reduce the volume of the pressure chamber 48, at the same time, the tip of the operating rod 45 is held in a state corresponding to the valve body 35 in the closed state of the opening / closing valve mechanism 15 with a slight gap. In addition, when high pressure air is supplied from the compressor into the pressure chamber 48, as the piston 47 moves against the elasticity of the compression coil spring 55, the operating rod 45 projects and the paint supply passage 13 is formed. By crossing, the valve element 35 is pressed to be pushed into the housing 20, and the actuator mechanism 16 having such a configuration is similar to the opening / closing valve mechanism 15 in that the compression coil spring 55 is made of ceramics and other parts are Each is molded with a synthetic resin.

Further, a closing body 60 made of a non-conductive synthetic resin material is tightly fitted into one of the plurality of storage chambers 18 for the opening / closing valve mechanism 15, and a positioning groove 61 is formed in the outer periphery thereof. Is aligned with the positioning groove 31 of the accommodating chamber 18, and the positioning pin 30 is fitted into the grooves 31 and 61 so as to be fixed.
The opening to the paint supply passage 13 is closed, while the storage chamber for the actuator mechanism 16 corresponding to the storage chamber 18 is closed.
A closing body 62 also made of a non-conductive synthetic resin material is fixed in the inside of 38 by screwing a male screw 63 of the base end portion thereof into a female screw 43 of the large diameter portion 39, and the housing chamber 38 and the paint. Supply route
The outflow hole 53 communicating with 13 is closed.

In the color changing unit 2 having such a configuration, the projection 12 on the front end surface of the base body 11 is fitted into the connection hole 67 formed at the lower position of the front end portion of the spray gun 1 by fitting the O-ring 66 on the outer periphery thereof. By fitting, the paint supply passage 13 is connected to the introduction passage 5 of the spray gun 1, and the rear portion of the base body 11 is attached to the lower surface of the spray gun 1 by tightening the bolts 69 with the fixtures 68. ing.

This embodiment has the above-mentioned structure, and the connector of each actuator mechanism 16 of the color changing unit 2 attached to the spray gun 1.
A compressor is connected to each of 49 and one open / close valve mechanism
By connecting the solvent pressure supply source to the connector 25 of 15 and connecting the pressure supply sources of the paints of different colors to the connectors 25 of the other plurality of open / close valve mechanisms 15 respectively, the coating work becomes possible. When air is pressure-fed to one actuator mechanism 16, its operating rod 45 projects to separate the valve body 35 of the corresponding on-off valve mechanism 15 from the valve seat 21, thereby opening the valve port 34, and opening and closing the valve. The paint of a desired color is supplied from the paint pressure source connected to the valve mechanism 15 to the paint supply path of the base 11.
It is supplied into the spray gun 13, guided into the spray gun 1, and applied to the object to be coated.

Then, when changing colors, the on-off valve mechanism 15 in the open state is closed by stopping the supply of air to the actuating mechanism 16 in operation, and the on-off valve connected to the solvent pressure source is closed. The mechanism 15 is opened by the operation of the actuator mechanism 16 corresponding thereto, and the solvent is supplied from the paint supply path 13 to the introduction path 5 of the spray gun 1 and ejected from the paint ejection port 4 to thereby paint. The inside of the flow path is washed, and after that, the other actuator mechanism 16 is operated to open the other opening / closing valve mechanism 15, so that the paint of another color is supplied to the spray gun 1 to the object to be coated. Further, when the parts of one of the opening / closing valve mechanism 15 and the actuator mechanism 16 are replaced or repaired, it is necessary to disassemble only one mechanism 15 or 16 and perform necessary work. At this time, the other mechanism 16 or 1 Since 5 does not need to be disassembled, it is possible to perform the work in a short time and with less labor compared to the conventional case where both mechanisms have to be disassembled.

During coating, the space between the nozzle 3 having the electrode 8 at the front end portion of the spray gun 1 and the metal mounting portion 70 at the rear end portion for fixing to the drive device (not shown) is made of a non-conductive material. In addition, since the on-off valve mechanism 15 and the actuator mechanism 16 located between the nozzle 3 and the mounting portion 70 are composed of parts made of a non-conductive material, the mounting portion of the spray gun 1 is The creepage distance from 70 ensures a long dimension up to the nozzle 3, which prevents the creeping discharge from occurring due to the dust.
Open / close valve mechanism even if a discharge occurs between the
Since the components of 15 and the actuator mechanism 16 are non-conductive, internal sparks do not occur in these components, and the internal sparks are generated by the components, especially the compression coil springs 36 and 55 that are repeatedly deformed. It is possible to prevent the life of the product from being shortened and the noise generated by the internal spark from adversely affecting the control device and the like.

In this embodiment, since the number of types of paint required for the actual painting work is smaller than the number of types of paint that can be applied to the color changing unit 2, unnecessary storage chambers 18, 38 are not provided. ,
The on-off valve mechanism 15 and the actuator mechanism 16 are replaced by a closing body 6
The numbers 0 and 62 are attached, and the number thereof may be appropriately changed according to the number of types of paint required for the painting work.

In the above embodiment, the color changing unit 2 is directly attached to the spray gun 1 for use, but instead of this, the color changing unit 2 is installed at a position apart from the spray gun 1, and the color changing unit 2 is used. The paint supply passage 13 and the introduction passage 5 of the spray gun 1 may be connected by a hose.

The present invention is not limited to the air spray gun for electrostatic coating described in the above embodiments, but can be applied to a spray gun for non-electrostatic coating or an airless spray gun.

[Brief description of drawings]

The accompanying drawings show an embodiment of the present invention, FIG. 1 is a sectional view,
FIG. 2 is a perspective view in a state of being removed from the spray gun, and FIG. 3 is a partially cutaway side view in a state of being attached to the spray gun. 1: Spray gun, 2: Color change unit, 3: Nozzle, 5: Introduction path, 8: Electrode, 11: Base material, 13: Paint supply path, 15: Open / close valve mechanism, 16: Actuator mechanism, 18: (Open / close valve (Accommodation chamber), 21: valve seat, 34: valve opening, 35: valve body, 36: (of opening / closing valve mechanism)
Compression coil spring, 38: accommodating chamber (of actuator mechanism), 40: cylinder, 45: operating rod, 47: piston, 55: compression coil spring (of actuator mechanism), 60: closing body (for opening / closing valve mechanism), 62: Closure body (for actuator mechanism)

Claims (3)

[Claims] 1. A plurality of pairs of storage chambers forming a pair at two positions sandwiching the paint supply passage are formed in a base body having a paint supply passage connected to an introduction passage leading to a nozzle of a spray gun. In one of the storage chambers, the valve body that is always in contact with the valve seat by a spring force closes the valve opening that opens in the paint supply passage, and the valve is pressed by the paint supply passage side. An on-off valve mechanism was provided in which the valve opening was opened by separating the body from the valve seat, and the other of the accommodation chambers of each pair was always fitted into the cylinder by spring force. The operating rod fixed to the piston is held in a state in which the tip of the operating rod facing the paint supply path is spaced apart from and corresponds to the valve body of the on-off valve mechanism in the valve closed state, and into the cylinder. The piston and the The movement of Do杆, the actuating rod of the tip coating machine for coating color change device characterized in that a actuator mechanism so as to press the valve body in the valve opening direction across the paint feed channel 2. A paint color changing device for a coating machine according to claim 1, wherein a closing member for closing an opening from the storage chamber to the paint supply passage can be mounted. 3. The electrostatic coating in which the base body and the components of the opening / closing valve mechanism and the actuator mechanism are made of a non-conductive material such as synthetic resin or ceramics, and an electrode for applying a high voltage is attached to the nozzle. The paint color changing device for a coating machine according to claim 1 or 2, wherein the spray gun is attached to the spray gun.