JPH0429874Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paint selective supply device that selects and supplies paint of an appropriate color to a coating machine.

[Prior Art] With the increasing use of multi-colored paint for automobiles, etc., it has become necessary to paint by sequentially changing colors using a single paint machine, and a device for selectively supplying paint has been proposed. When changing paint colors in the equipment, it is necessary to clean the paint flow path to avoid color mixing.

During this cleaning, in the conventional paint selective supply device, the paint outlet of the valve that supplies paint to the paint flow path forms a liquid pool when viewed from the paint flow path side.
There was a problem that the cleaning efficiency was not good when the cleaning liquid was flowed into the paint flow path.

In addition, when using paint containing fine solid particles, there is the problem that the valve seat of the valve that opens and closes the flow path and the seals that come into contact with and separate from it wear out, so it is important to have a valve structure that can handle such wear. something is required.

[Problems to be Solved by the Invention] The purpose of the invention is to solve the above-mentioned problems in the paint selective supply device, and in particular, to solve the problems in the paint selective supply device, and in particular, to ensure that the paint outlet in the valve that supplies paint to the paint flow path is To provide a valve structure for forming a paint flow path so that it can be cleaned extremely efficiently and in a short time when a cleaning liquid is flowed therein without forming a liquid pool.

[Means for solving the problem] In order to achieve the above object, the present invention arranges and installs a plurality of three-way valves for supplying different colors of paint to the paint flow path leading to the paint sprayer, and connects these three-way valves. By selectively operating the paint of a desired color, paint of a desired color is supplied to the coating machine, and when changing the color to be painted, a cleaning liquid is flowed into the paint flow path to clean the flow path. In the supply device, a valve seat provided at the paint outlet from the three-way valve to the paint flow path,
A seal part that approaches and separates from the valve seat, which is provided on the end face of a valve seat base formed to be flush with the inner surface of the paint flow path, is attached to the tip of the valve stem whose head protrudes into the paint flow path.
It is constructed by providing the valve seat so as to be opened and closed from the paint flow path side.

[Operation] When paint is introduced into the three-way valve from the inlet,
While the valve seat of the paint outlet from the three-way valve to the paint flow path is closed, the paint is returned to the circulation path through the circulation port of the three-way valve, but when the valve seat is open, the paint is returned to the circulation path. Paint is supplied to the paint channel through the outlet.

If you want to change the color of the paint supplied to the paint sprayer,
The supply of paint from the paint outlet is stopped and the cleaning liquid is flowed into the paint flow path, but the paint flow path does not have any recesses where paint can accumulate, and the head of the valve stem where paint is attached is covered with paint. It protrudes into the flow path, disrupts the flow of the cleaning solution, and promotes the agitation cleaning action.At the same time, its head is exposed to the flow of the cleaning solution and is rapidly purified, allowing cleaning to be completed in a short time with a small amount of cleaning solution. .

[Example] Figures 1 and 2 show an example of a three-way valve in a paint selective supply device according to the present invention, and
FIG. 3 schematically shows the entire selective supply device.

As shown in Fig. 3, this paint selection supply device is equipped with a large number of three-way valves 3, 3, . By selectively operating the three-way valve 3, paint of a desired color is supplied to the coating machine 1 through any three-way valve 3. When changing the color to be painted, flush thinner or the like for cleaning from the base end 4 side of the paint flow path 2 toward the coating machine 1.
After washing, a new color paint is pumped to the coating machine by operating the other three-way valve 3.

The three-way valve 3 suppresses sedimentation of the paint by flowing the paint pumped from the pump 5, which is always in a driven state, into the circulation path 6, and closes the circulation path 6 side when sending the paint to the coating machine 1. At the same time, the paint outlet 7 is opened.

Next, the configuration of the three-way valve 3 will be explained based on FIGS. 1 and 2.

The flow path member 11 to which the valve body 10 of the three-way valve 3 is attached is made of, for example, aluminum, and has a paint flow path 2 with a rectangular cross section that communicates with the coating machine 1 inside. A recessed hole 12 is formed which reaches the paint flow path 2 for mounting the valve body 10 of the three-way valve 3 together with the valve seat 13. This flow path member 11 is formed so that each three-way valve 3 can be mounted independently or a plurality of three-way valves 3 can be mounted in parallel. In order to prevent paint from adhering to the inner surface of the paint flow path 2 and to facilitate cleaning when changing colors, it is desirable to process the inner surface of the paint flow path 2 to have a mirror surface as much as possible. Polished by flowing.

The valve body 10 has a paint inlet 1 at an opposite position.
5 and a circulation port 16, and a valve rod 17 is disposed on the side communicating with the inlet 15 and passes through a flow path within the valve body 10. This valve stem 17 is provided with a seal portion 18 at its tip for opening and closing the paint outlet 7 by coming into contact with and separating from the valve seat 19 provided on the valve seat base 13, and at the other end, the diameter of the seal formed by the seal portion 18 and the valve seat 19 is A seal rod 20 with a large diameter is connected in series, supported by a bonnet 21 on the valve body 10 via a seal ring 22, and a spring 23 compressed between the valve body 10 closes the seal portion 18. It is biased in the direction of Further, the seal rod 20 is provided with a seal end face 25 that comes into contact with and separates from the seal seat 24 on the valve body 10, and the flow of paint from the inlet 15 to the circulation port 16 is blocked by their contact. However, this blocking does not necessarily have to be done reliably.

The valve seat 13 is made of abrasion-resistant and chemical-resistant resin such as fluororesin called Teflon (trademark).
The valve body 10 is inserted into the valve body 10, and the valve body 10 is inserted so as to prevent paint from leaking between them. The end surface 26 of the valve seat 13 on which the valve seat 19 is formed forms a part of the paint flow path 2 of the flow path member 11 having a rectangular cross section, and is formed to be flush with the inner surface of the flow path 2. The seal portion 18 of the valve stem 17 that approaches and separates from the valve seat 19 is aligned with respect to the axis of the valve stem 17.
It has an angle of about 30 to 60 degrees.

Therefore, the head 27 of the valve stem 17 provided with the sealing part 18 necessarily protrudes into the paint flow path 2, and the valve seat 1
9 is opened and closed from the side of the paint flow path 2, and no recesses in which paint may temporarily accumulate are formed in the paint flow path 2.

Further, when the valve seat base 13 is formed of the above-mentioned resin, wear of the valve seat 19 is suppressed even when a paint containing a large amount of fine solid particles is used.
Even if the particles are caught between the seal portion 18 and the seal portion 18 when they come into contact with each other, they will not bite into the valve seat 19 side and cause wear or paint leakage. Furthermore, the above-mentioned angled seal portion 18 has the effect of being aligned and at the same time causing deposits to slide during sealing. Note that this seal portion 18 can be formed of metal or resin having wear resistance and chemical resistance.

On the other hand, a seal rod 20 connected to the valve rod 17
penetrates the bonnet 21 on the valve body 10 and projects into the piston chamber 30 in the cover 29 attached thereon, and its tip touches the piston 31 slidably housed in the piston chamber 30. I'm letting you touch me. A pilot port 32 for introducing pilot fluid is opened in the piston chamber 30 on the opposite side of the piston 31, and the valve stem 17 is driven via the piston 31 by the pilot fluid introduced there.

In the paint selective supply device having the above configuration, when no pilot fluid is introduced into the pilot port 32, the seal portion 18 is pressed against the valve seat 19 by the biasing force of the spring 23, and at the same time Since the seal rod 20 has a large diameter, the fluid pressure acting on the seal rod 20 exhibits self-sealing properties, and the seal portion 18 closes the valve seat 19. Therefore, when paint is introduced from the inlet 15 by the pump 5, the paint flows between the spring 23 and the seal seat 24 on the valve body 10 and the seal end face 2 of the seal rod 20.
5, reaches the circulation port 16, and is returned to the circulation path 6.

When pilot fluid is introduced into the pilot port 32, the valve rod 17 is pressed together with the piston 31, and the seal end surface 25 of the seal rod 20 is pressed against the valve body 1.
0 reaches the stroke end and blocks the flow of paint from the inlet 15 to the circulation port 16, and at the same time opens the valve seat 19 by the seal part 18 and opens the paint flow path through the paint outlet 7. Paint is supplied to 2.

Note that a spring 23 disposed in the paint flow path
It also has the function of stirring the paint to prevent solid particles from settling therein and to homogenize the paint.

When changing the color of the paint supplied to the coating machine 1, stop the supply of paint from the paint outlet 7,
A cleaning liquid such as thinner is flowed from the base end 4 side of the paint fluid 2, but there is no recess in the paint flow path 2 where paint can accumulate, and the head 27 of the valve stem 17 to which the paint is attached is not in contact with the paint flow. Since it protrudes into the channel 2, that part disturbs the flow of the cleaning liquid and promotes the agitation cleaning action, and at the same time, its head is exposed to the flow of the cleaning liquid and is rapidly purified, cleaning in a short time with a small amount of cleaning liquid. can be completed.

[Effects of the invention] According to the paint selection and supply device of the present invention, by improving the valve structure of the three-way valve that supplies paint to the paint flow path, the paint outlet of the three-way valve can When the cleaning liquid flows into the paint flow path without forming a pool, the paint flow path can be cleaned very efficiently and in a short time.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the three-way valve in the paint selection supply device according to the present invention, Fig. 2 is a longitudinal sectional view of the same main part, and Fig. 3 is a block diagram showing the outline of the overall configuration. . 1... Paint machine, 2... Paint flow path, 3... Three-way valve, 7... Paint outlet, 13... Valve seat, 17...
Valve stem, 18... Seal part, 19... Valve seat, 26...
...End face, 27...Head.

Claims (1)

[Claims for Utility Model Registration] A plurality of three-way valves for supplying different colors of paint to a paint flow path leading to a coating machine are installed in an array, and by selectively operating these three-way valves, a desired color can be obtained. When supplying paint to a coating machine and changing the color to be painted, in the paint selective supply device which flushes cleaning liquid into the paint flow path to clean the flow path, the three-way valve is connected to the paint flow path. The valve seat provided at the paint outlet is provided on the end face of the valve seat base, which is formed to be flush with the inner surface of the paint flow path, and the seal part that comes into contact with and separates from this valve seat is placed so that its head is inside the paint flow path. A paint selective supply device characterized in that a valve seat is provided at the tip of a protruding valve stem so as to open and close the valve seat from the paint flow path side.