JPH0815574B2 - Flat spray nozzle with cleaning device - Google Patents

Description

The present invention relates to an orifice type flat-spray nozzle equipped with a cleaning device for eliminating blockage due to foreign matter and the like, and to a nozzle suitable for airless spray coating by fan-shaped spray formation.

[Conventional technology and its problems]

The orifice type nozzle used for airless spray coating may be blocked by foreign matter during use because of its small opening area.To clean the blocked nozzle, the nozzle is conventionally a spherical or cylindrical rotor. The nozzles are provided to reverse the direction of the nozzles as necessary, so that foreign matters and the like in the nozzles are cleaned by the backward pressure fluid.

According to such a rotary cleaning device, it is necessary to swivel the nozzle 180 ° for cleaning before cleaning, and further swivel 180 ° after cleaning to restore the nozzle. When it is a nozzle for spray coating, it requires a relatively long time, and since the paint pressure is as high as 100 kg / cm ² , the rotation resistance due to the pressure contact between the rotor and packing is large to prevent liquid leakage. , Has a defect that requires a powerful turning operation.

[Object of the Invention]

An object of the present invention is to provide a flat-spraying nozzle with a cleaning device that can perform cleaning and restoration in a remarkably short time and can be operated easily, and another object is to provide a gun and a supply nozzle. It is an object of the present invention to provide a flat-spraying nozzle with a cleaning device that can enlarge the flow passage without removing the nozzle even when cleaning the liquid system passage and improve the efficiency of the cleaning work.

[Means for solving problems]

In order to achieve the above object, the present invention is configured to divide a nozzle tip having a lip-shaped orifice type nozzle into two parts that come in contact with and separate from each other in the left-right direction, and to move one segment constituting the nozzle tip back and forth in the left-right direction. The advancing / retreating drive means is attached, and the injection port is expanded by the advancing / retreating drive means.

〔Example〕

Hereinafter, the flat spray nozzle of the present invention will be described in detail with reference to the illustrated embodiments.

In the embodiment shown in FIGS. 1 to 4, while the nozzle tip 2 having the lip-shaped orifice type nozzle 1 is provided in the holder 3, the holder 3 is retailed at the tip of the spray gun body 4 with the packing 5 interposed. A valve seat 7 and a needle valve 8 corresponding to the valve seat 7 are provided near the tip of the gun body 4 by a nut 6, and the needle valve 8 is retracted so that a pressurized liquid such as paint is supplied to the nozzle tip 2 The fact that the fan-shaped spray can be ejected from the nozzle 1 to the front by supplying the fan-shaped spray to the rear is similar in nature to the conventional flat-blowing nozzle.

Regarding the nozzle tip 2, a so-called semi-cylindrical so-called semi-cylindrical recess 9 is formed in the rear open state, and the V-shaped external groove 10 is opened in the front open state so as to cross the recess 9 to an appropriate depth. To form a lip-shaped orifice-type injection port 1 and a nozzle tip 2
Is a split type consisting of segments 2a, 2b that are contacted and separated in the left-right direction on a plane including the center line of the groove bottom parallel to the external groove 10 and the nozzle axis (spray ejection axis).
As its concrete structure, as shown in detail in FIG. 3 and FIG. 4, two short cylindrical materials made of hard material such as cemented carbide having a pore 11 at the center are formed under a common axis relationship. In addition, the joint surface 12 is made to abut on each other, and a diagonally forward facing cut portion 10 'is formed substantially in the front half of the joint surface 12 so that the external groove 10 is formed by both cut portions 10'. ,
Also, a rear release notch 13 communicating with the pore 11 so as to communicate with the rear end portion of the joint surface 12 of both the segments 2a, 2b is machined to such a degree that the joint surface 12 is slightly left, and a further machined portion is formed. A portion near the front end close to 10 'is formed in the chevron portion 14, and both segments 2a, 2
In b, a groove 15 for turning control and for guiding forward / backward in the left / right direction
Is cut in the left-right direction at right angles to the nozzle axis (spout axis from the injection port 1).

Regarding the mounting of the nozzle tip 2 composed of the segments 2a and 2b, the holder 3 which is configured by combining and combining the holder members 3a and 3b in which the forward facing notches 16 and 17 are formed at right angles is provided, and one of the holders 3a and 3b is provided. The nozzle tip 2 is attached to the holder member 3a with the nozzle 1 of the nozzle tip 1 corresponding to the notches 16 and 17, but one segment
While fitting 2a to the holder member 3a, the other segment
As for 2b, it is provided so as to be in contact with each other at the joint surface 12 with the 2a while being fitted to the tip of the slider 18 which can be moved forward and backward in the holder member 3a.
In addition, the holder member 3a is provided with a projection 19 that engages with the groove 15 in the segments 2a and 2b separately, and a position regulation mechanism by the groove 20 and the projection 21 is provided for coupling with both holder members 3a for angular relationship regulation. In addition to installing, tighten the screws 22.

As a means for driving the slider 18 forward and backward, it is preferable to use, for example, a pneumatic actuator including a cylinder 23 and a piston 24, that is, the cylinder 23 is fixed to the holder member 3a with the interposition of the spring receiving member 25. At the same time, while the piston 24 and the slider 18 are connected by the rod 26, a compression spring 27 is provided behind the slider 18 so as to keep the slider 18 easily advancing at all times, and the cylinder 23 is under pressurized air. Pressurized air can be timely supplied from a source 28 via a solenoid valve 29.

Power supply to the solenoid valve 29 when the nozzle nozzle 1 is closed may be manually operated, but as shown in the drawing, the valve seat 7 and the nozzle nozzle 1 are provided on the side of the segment 2a of the holder 3a. Measuring chamber 30 communicating with the supply path between
Is provided so that the pressurized fluid near the injection port 1 can be introduced, and a pressure sensor 31 such as a semiconductor pressure sensor is provided in the measurement chamber 30 to amplify the signal from the pressure sensor 31. It is possible to input to the controller 33 under the intervention of 32, and only when the input signal is a value corresponding to the pressure of the supply fluid of pressurized fluid such as paint or a pressure close thereto in the controller 33. A drive signal is output to the solenoid valve 29, whereby the pressure sensor 31 detects that the pressure in the flow path near the nozzle 1 has rapidly increased due to the blockage of the nozzle 1, and at the same time operates the solenoid valve 29 based on the detection result. Therefore, the pressurized air is supplied to the cylinder 23 to separate the segment 2b from the segment 2a, and the injection port 1
Automatically expands to remove the foreign matter that has caused the blockage as the pressurized liquid is ejected, and the pressure upstream of the nozzle 1 near the injection port 1 decreases due to the release of the foreign matter. The detection signal from 31 stops or drops, and the solenoid valve
When 29 is restored, the slider 18 is restored by the spring 27, that is, the segment 2b, and returns to the normal ejection state.

In cleaning foreign matter, the nozzle 1 is expanded and a large amount of pressure liquid is sprayed at once. Therefore, the nozzle 1 is expanded by the actuator in order to prevent the front coated article from being contaminated. Prior to this, the shield plate 34 is advanced in front of the injection port 1 by the actuator 36 by the air pressure from the solenoid valve 35, or the gun body 4 is directed in a direction such as a drainage tank which does not hinder the collision of the injection liquid. It is better to let them do it.

A pressure sensor is used as a sensor for detecting the blockage of the injection port 1.
Unlike the method by 31, the optical sensor may be adopted, and as shown by the chain line in FIG.
38 is provided, and when the injection port 1 is closed, there is no light-shielding effect by the injection liquid, so that the amount of received light is increased as compared with that in the normal injection system, and this is amplified by the amplifier 32 and input to the controller 33.

In the above-mentioned embodiment, the cleaning for removing the blockage of the injection port 1 is performed under the remote control by pneumatic pressure. However, it is preferable to manually perform the cleaning of the handgun each time the blockage is performed. As shown in FIG. 5, while the slider 18 fitted with the segment 2b is provided by the spring 27 so as to easily advance forward, the passive piece 39 is fixed to the rear end of the slider 18 by the rod 26 and the spring receiving member is provided. 25 is used as a scaffold and a "lever" type handle 40 is provided, and the point of action is the passive piece.
The slider 18 is segmented by making the handle 40 push and swivel in the direction of the arrow as required.
2b together with the spring 27 so as to be able to retreat against the spring 27 so that the injection port 1 can be expanded, or as shown in FIG. 26 'is screwed and the rod 26' and the slider 18 are connected by a freely rotatable shaft joint 41, and the handle 40 is rotated as necessary, so that the slider 18 'is rotated.
It is also possible to advance and retreat to allow the nozzle hole 1 to expand and contract.

Machining portion 10 'of the segments 2a, 2b for forming the nozzle 1
With regard to the above, various modifications can be made without being limited to the shapes shown in FIGS. 1 to 6.
The external groove 10 formed by synthesizing may have a trapezoidal shape as shown in FIG. 7, a rectangular shape as shown in FIGS. 8 and 9, or a U-shaped shape as shown in FIG. The shape is not limited to the cylindrical shape, and may be a V-shaped groove shape or a dome shape as shown in FIG.

〔The invention's effect〕

As described above, according to the present invention, while the flat-blowing nozzle is vertically divided into two parts in the center parallel to the external groove, the injection port is expanded by the advancing / retreating drive means for advancing / retreating the divided segment in the left-right direction. I decided to open it,
This not only makes it possible to remove the foreign matter that has caused the blockage by enlarging the injection port significantly and quickly as necessary, but also without removing the nozzle when cleaning the gun and the liquid supply system passage. There is an effect that the work path can be improved by enlarging the path, and cleaning can be easily performed by remote control by using a pneumatic actuator or the like.

[Brief description of drawings]

In the drawings, FIGS. 1 to 4 show a flat-spraying nozzle with a cleaning device according to an embodiment of the present invention. FIG. 1 is a longitudinal side view, FIG. 2 is a front view, and FIG. A cross-sectional plan view, FIG. 4 is an exploded perspective view of only the nozzle tip, and FIGS. 5 and 6 are cross-sectional plan views of only essential parts showing other embodiments respectively, FIG. 7, FIG. 8, FIG. 9 and 10
FIG. 11 is a cross-sectional plan view of only a main portion showing still another embodiment of FIG. 11 and FIG. 11, respectively. 1 …… Nozzle 2 …… Nozzle tip 2a …… Segment 2b …… Segment 10 …… External groove 12 …… Joint surface

Claims (1)

[Claims] 1. A flat-blowing nozzle provided with a nozzle tip (2) having a lip-shaped orifice type nozzle (1), wherein the nozzle tip (2) is a center line of a groove bottom parallel to an external groove (10). And a nozzle axis are divided into two, and the two divided segments (2a) and (2b) are provided so as to be able to come in contact with and separate from each other in the left-right direction while corresponding to each other at the joint surface (12), and one segment (2b ) Is provided with an advancing / retreating drive means in the left-right direction, and the advancing / retreating drive means separates both segments (2a), (2b) to widen the injection port (1).