JPS6138694Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flow control valve used in an airless coating device that atomizes liquid paint by pressurizing it to high pressure and ejecting it from a small-diameter nozzle hole.
This invention relates to a flow control valve that allows quick removal of paint clogging.

Flow control valves for conventional airless painting equipment include:
Variable control valves were mainly used in which the degree of aperture was adjusted by moving the needle valve relative to the orifice by rotating a knob. Extender pigments and aggregates such as silica powder, white silica powder, and talc may become clogged between the needle valve and the orifice, making it impossible for them to flow.In this case, rotate the knob to retract the needle valve. It is necessary to fully open the orifice and pour out the clogged aggregate, but since the needle valve adjustment screw has a fine pitch to allow fine adjustment, it is difficult to fully open the orifice and return it to its original position. Not only does it require multiple rotations of the knob, but it also requires delicate adjustments to accurately return to the original aperture.
It takes a considerable amount of time to remove clogging from the paint, and especially when the paint is mixed with coarse aggregate, such as zinc-rich paint for rust prevention, paint clogging of the flow control valve occurs frequently. It takes a lot of time to remove them, which is a major cause of reduced work efficiency.

The present invention was developed in view of the above circumstances, and its purpose is to provide a flow control valve that can remove paint clogging in almost a single action. .

Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

In the figure, 1 is a tube-shaped valve body with a mounting hole 2 transparently provided in the center of the upper surface, and the front and rear of the mounting hole 2 are
A paint flow hole 4 is provided in the center, and a pair of rotation guides 3, 3 each having a spherical sliding surface 5 formed on the corresponding surface is fitted, and each rotation guide 3 is screwed to both the front and rear ends of the valve body 1. The nipple 6 is pressed in the corresponding direction via the O-ring 7, and between the rotation guides 3, 3 is a substantially spherical rotating body that slides on the sliding surfaces 5, 5 and rotates freely. 8 is attached. A stepped fitting hole 9 is transparently provided in the center of the rotating body 8, and a nozzle tip 10 is fitted into the front end of the fitting hole 9, and is screwed into the rear end of the fitting hole 9. It is fixed by a set screw 12. Nozzle tip 1
0 is used for a spray gun of an airless coating device, and has a small diameter orifice 11 in the center.
is transparent. Further, a through hole 13 having a hexagonal cross section is formed in the center of the set screw 12 and engages with a hexagonal handle for tightening, and when the rotating body 8 is at the angle shown in FIGS.
Both sides of the valve body 1 are in communication with each other through the through hole 13.

A guide cylinder 14 is provided upright in the mounting hole 2 of the valve body 1, and a rectangular engaging body 15a at the lower end of the rotary operating rod 15 is supported by the guide cylinder 14 for only rotation.
It fits into a rectangular recess 8a formed on the upper surface of the rotary body 8, and a handle 1 is attached to the upper end of the rotary operation rod 15.
6 is installed.

The flow control valve of this embodiment is interposed in the paint pipe of the airless coating apparatus, with the right side in FIGS. 1 and 2 being the inflow side and the left side being the outflow side, and connected by nipples 6, 6. In normal operation, as shown in FIG. 1, the handle 16 is turned to the right and the nozzle tip
0 toward the paint outflow side, the liquid paint flowing in from the right side of the figure is throttled by the orifice 11 of the nozzle tip 10 and the flow rate flowing out to the left is suppressed, but the aggregate in the paint , when the orifice 11 is clogged with pigment, etc., the handle 16
When the nozzle tip 10 is turned 180 degrees to face the paint inlet side as shown in Figure 2, the aggregates caught in the orifice will be released by the pressure of the paint and flow out to the left in the figure. By rotating the motor 16 by 180 degrees and returning it to the state shown in Fig. 1, normal operation can be resumed.

In this embodiment, the nozzle tip of a spray gun is used as the nozzle tip 10, so if the orifice 11 expands due to wear, or if you want to change the control flow rate, the nozzle tip may become unusable for the spray gun due to wear. There is an advantage that the nozzle tip can be used as is, or the nozzle hole can be modified by wrapping.

As clarified by the above explanation, the flow control valve for airless painting equipment of the present invention has a rotary guide with a transparent paint flow hole fitted into the valve body connected to the paint pipe. A fitting hole in a direction substantially perpendicular to the straight line is provided in a rotary body that can slide approximately 180 degrees around a straight line that is in sliding contact with the rotation guide and is substantially perpendicular to the center line of the paint flow hole, and the fitting hole is provided in a direction substantially perpendicular to the straight line. A nozzle tip with an orifice for flow rate adjustment transparently inserted into the hole is removably fitted, and a rotary operating rod connected to the rotary body is protruded out of the valve body, By rotating the rotary operating rod approximately 180 degrees, the nozzle tip turns in the opposite direction along with the rotating body, and aggregates caught in the orifice can be removed by the pressure of the paint. If this is done, the nozzle tip can return to its original state and operate normally, and paint clogging can be quickly removed, which can significantly improve the efficiency of painting work, especially for paints containing coarse aggregate. effective. If the flow rate does not change even if the nozzle tip is reversed, it is sufficient to simply rotate the nozzle tip approximately 180 degrees, and there is no need to return the nozzle tip to its original position after removing the paint clog.

Furthermore, in the flow rate control valve of the present invention, since the nozzle tip is detachably attached to the rotating body, the controlled flow rate can not only be changed by replacing the nozzle tip, but also as in the previous embodiment. ,
It is also possible to use a nozzle tip for a spray gun, which is extremely convenient in practice.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, in which FIG. 1 is a vertical cross-sectional view during normal operation, and FIG. 2 is a vertical cross-sectional view during paint clogging removal. DESCRIPTION OF SYMBOLS 1... Valve body, 3... Rotation guide, 4... Paint flow hole, 8... Rotating body, 9... Fitting hole, 10... Nozzle tip, 11... Orifice, 15... Rotating operation rod.

Claims (1)

[Scope of Claim for Utility Model Registration] A flow control valve installed in a paint pipe of an airless coating device, wherein a rotation guide with a transparent paint flow hole is fitted into the valve body connected to the paint pipe. A fitting hole extending in a direction substantially perpendicular to the straight line is provided in a rotary body that can rotate approximately 180° about a straight line that is in sliding contact with the rotation guide and that is approximately perpendicular to the center line of the paint flow hole. , an airless valve characterized in that a nozzle tip having a transparent orifice for controlling flow is removably fitted into the fitting hole, and a rotating operating rod connected to the rotating body projects out of the valve body. Flow control valve for painting equipment.