JP3077819B2 - Paint gun - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating gun for spraying a coating material on an object to be coated, the coating gun having a cleaning function of a nozzle portion.

[0002]

2. Description of the Related Art Conventionally, there has been known an apparatus for detecting clogging of a nozzle opening in a coating gun in which a coating is sprayed from a nozzle portion to spray the coating. In such an apparatus, as shown in, for example, Japanese Utility Model Application Laid-Open No. 63-58661, a detection means provided near a nozzle injection hole detects a collapse of the injection pattern shape at the time of spraying paint, and the nozzle opening is opened. When it becomes clogged, an alarm is issued using the change in the injection pattern. As a clogging detection device of the same kind, Japanese Utility Model Application Laid-Open No. 63-144868 or Japanese Utility Model Application Laid-Open No.
An apparatus such as -120958 is also disclosed. On the other hand, a device for cleaning the inside of such a coating gun when it is clogged is also known. For example, Japanese Unexamined Utility Model Application
In the case of No. 6, thinner and air are alternately introduced into the coating gun to remove paint remaining on the hose or the like.

[0003]

However, in the conventional case, even if the clogging is detected by the clogging detection device, if the clogged place is a narrowed portion such as the nozzle, the nozzle is disassembled and cleaned. There is a problem that it is necessary and takes time. That is, as in the above-mentioned Japanese Utility Model Application No. 2-866666,
If the cleaning liquid flows in the same direction as the paint discharge direction even if the cleaning liquid and air are introduced, it cannot be effectively removed, especially in places where the passage is narrow, and the nozzle is removed to improve the cleaning effect. It is necessary to do.

[0004]

According to the present invention, a valve chamber inside a gun body and an inlet of a paint supply passage are opened and closed by a valve member, and a paint and a cleaning liquid are selected by the valve member. The liquid was supplied to the tip nozzle portion. And this nozzle part has a penetrating
A pair of orifice injection holes is provided at both ends of the hole to provide a reversible liquid-tight orifice member in the housing, and the ends of the optical cable face each other outward.
A pair of pattern detection members facing each other is provided. Soshi
If the injection pattern is normal, one orifice injection hole
From the other orifice through the through hole
The light path is interrupted by the spray particles and the orifice member is inverted.
If the ejection pattern is abnormal, the optical path is
The orifice member is inverted and the other orifice injection hole is
One orifice injection port facing the paint supply path outlet
It was made to be injected from the hole .

[0005]

The paint supplied to the valve chamber inside the gun body is supplied to the nozzle through the paint supply passage, but the supply of the paint is interrupted by closing the inlet of the paint supply passage with a valve member.
A circuit for supplying the cleaning liquid to the nozzle portion is configured. And
Injection using a pattern detection member using an optical cable
By automatically reversing the orifice member when the pattern is abnormal, the cleaning liquid can be introduced from the orifice injection hole on the side opposite to the direction of spraying the paint, and the cleaning efficiency is opposite to the flow direction of the paint. Increase. Therefore, labor such as disassembly can be saved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a coating gun according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall view of a coating gun of the present invention, FIG. 2 is an enlarged view of a gun body and a nozzle portion, and FIG.
FIG. 4 is a cross-sectional view taken along the line AA of FIG. As shown in FIG. 1, the coating gun according to the present invention includes a gun body (1) that can be attached to the tip of a robot, a nozzle part (2) attached to the tip of the gun body (1), and a paint supply. And a cleaning circuit (4) for cleaning, so that operations from painting to cleaning are automatically performed.

As shown in FIG. 2, the gun body (1) has a valve chamber (6) connected to the paint circuit connection port (5), and a valve seat (7) is provided in front of the valve chamber (6). A valve rod (8) as a valve member is slidably fitted into the opening on the rear side of the valve chamber (6), and runs vertically through the valve chamber (6). The valve rod (8) is provided with a cleaning liquid conducting hole (9), which will be described later, and a cylinder unit (not shown) is further provided on the rear end side thereof. ) Is movable forward and backward. A paint supply passage (10) is formed in the center of the valve seat (7).
The distal end of a valve stem (8) can freely contact the inlet of the paint supply passage (10) on the valve chamber (6) side.

On the other hand, a washing circuit connection port (11) is provided behind the valve chamber (6). Then, a space (1) in the center of the main body leading to the cleaning circuit connection port (11).
In (2), sealing members (13) and (13) are provided before and after, and are pressed in the separating directions by elastic members (14), respectively. The central space (12) is kept liquid-tight. Also, the cleaning liquid passage hole (9) of the valve rod (8) described above.
With the valve rod (8) advanced, the rear opening faces the space (12) and the front opening of the valve rod (8) faces the paint supply path (10) with the valve rod (8) advanced. .

Next, the nozzle part (2) is provided with a nut member (16) which is screwed to the tip of the main body (1).
A pattern detecting member (18) is screwed around the outer periphery of the air nozzle member (17) engaged with the tip of (6). A housing member (19) is attached to an inner peripheral surface of the air nozzle member (17), and a rear end side of the housing member (19) is attached to a front end surface of the valve seat (7). It is in close contact with the packing member (20). A paint supply path (20a) communicating with the paint supply path (10) of the main body (1) is also provided at the center of the packing member (20). Housing member (19)
A substantially spherical orifice member (2)
2) is provided. This orifice member (22)
Is provided in a liquid-tight manner with respect to the inner surface of the housing member (19), and has two orifice injection holes (25) and (26) communicating with each other through an internal through hole (24).

The orifice member (22)
Are configured to be able to be inverted by 180 degrees. That is, as shown in FIG. 3, a shaft member (27) is attached to the orifice member (22). The shaft member (27) includes a housing member (19), an air nozzle member (17), and a pattern. Each of the detection members (18) is rotatably penetrated and extends to the outside.
8) is attached. And this gear member (2
A chain belt (29) is wound around 8) and connected to a drive source (not shown). Therefore, when the rotational driving force is transmitted to the gear member (28) via the chain belt (29), the orifice member (22) rotates around the shaft together with the shaft member (27). And two orifice injection holes (2
Both 5) and (26) are designed to be able to face the front of the outlet of the paint supply path (20a).

Next, the configuration of an air supply system for shaping the spray pattern of the paint at the time of spraying the paint and the detecting means for detecting the collapse of the pattern will be described. As shown in FIGS. 1 and 2, the gun body (1) is provided with an air connection port (31). The air connection port (31) is provided with an air source (33) through an on-off valve (32). ) Is connected, and communicates with the air chamber (35) of the nozzle portion (2) by an air conducting hole (34) provided in the gun body (1). The above-mentioned air nozzle member (17) is provided with an air communication hole (36) communicating with the air chamber (35).
6) passes through a bent portion (17a) projecting inward from both sides in front of the air nozzle member (17), and has a blowing port (37) facing the front of the orifice member (22). .

The pattern detecting member (18) attached to the outside of the air nozzle member (17) also has bent portions (18a) projecting inward from both front sides.
The ends of the optical cable (38) face each other in a pair of bent portions (18a) (18a), facing each other. And the optical cable (3
At the base end on one side of 8), a projector (3) as shown in FIG.
9) is provided, and a photodetector (40) is provided on the other side, which is connected to an amplifier (41) for amplifying the received light signal. The signal automatically controls the reversal of the orifice member (22) and the operation of the cleaning circuit described later, as described later.

Next, the paint circuit (3) and the cleaning circuit (4) will be described. The paint circuit (3) is provided with a plurality of paint sources (43), a thinner source (44), and an air source (45) for applying various colors, and is provided with a manifold via respective on-off valves (46). Field (47). The manifold (47) is connected to the paint circuit connection port (5) described above. On the other hand, the cleaning circuit (4) includes a thinner source (49) for cleaning and an air source (50), and can be controlled by respective on-off valves (51) and (52), and a check valve (49). 53) through the cleaning circuit connection port (1
1). And this on-off valve (51),
(52) is configured to automatically control the opening / closing based on the detection result of the above-mentioned pattern detecting means. For example, when the above-mentioned paint spray pattern is detected, the opening / closing valve (51) in a predetermined sequence, (52) operates.

The operation of the present coating gun having the above configuration is as follows. During coating by spraying the paint, the valve stem (8) of the gun body (1) is at the retracted position, and the valve chamber (6) and the inlet of the paint supply passage (10) are open and in communication. For this reason, the paint supplied from the paint circuit (3) enters the internal space (21) from the valve chamber (6) through the paint supply passages (10) (20a), and enters the orifice member (22).
Orifice injection hole (26) to through hole (24)
Through the orifice injection hole (25) on the other side. At this time, since the orifice injection hole (25) has a vertically long flat circular shape as shown in FIG. 4, the orifice injection hole (25) expands in a vertically long fan shape and is injected. At the same time, the air supplied from the air source (33) is supplied to the air nozzle member (1).
7) The fuel is blown out from the blowing port (37) at the tip, and the fan-shaped spray pattern is shaped into a flatter one.

An optical cable (38) of the pattern detecting member (18) detects an abnormality of the injection pattern. That is, as shown in FIG. 3, if the pattern is normal, the optical path between the pair of optical cables (38), (38) is blocked by the spray particles and no light is received, but the normal pattern is broken. Then, one of the optical cables (38) becomes conductive and detects an abnormality. The collapse of the injection pattern is caused by the orifice injection hole (25) of the orifice member (22).
In many cases, paint residue or foreign matter adheres to the vicinity.

When an abnormality is detected, the painting operation is interrupted and the cleaning circuit operates. That is, once the main body (1) separates from the object to be coated, the valve stem (8) moves forward to shut off the space between the valve chamber (6) and the paint supply path (10). And the paint supply passage (10). At the same time, the orifice member (22) is turned 180 degrees by the driving means. Therefore, the positions of the orifice injection holes (25) and (26) are reversed. Next, the thinner source (49) and the air source (50) of the cleaning circuit (4) are alternately supplied, and the orifice injection hole (2) is supplied from the paint supply path (10).
5), the through-hole (24) is washed and discharged to the outside through the other orifice injection hole (26). At this time, the orifice injection hole (25) which has been the discharge downstream side is located upstream of the flow path in the cleaning state, and the orifice injection hole (26) which has been upstream is the downstream side. Removal of paint residue and foreign matter is effectively performed. When the cleaning is completed, the valve stem (8) is retracted again and the coating operation is restarted.

[0017]

As described above, according to the coating gun of the present invention, the clogging of the discharge nozzle can be checked by the pattern detecting member using the optical cable.
Automatically detects when the injection pattern is abnormal by using
The cleaning circuit was immediately activated, and the orifice member was turned upside down for cleaning, so that quick measures were taken, and in the through hole of the orifice member, the flow direction of the paint and the flow of the cleaning liquid were reversed, and the cleaning efficiency was reduced. High cleaning is possible. Further, by configuring the switching between the paint and the cleaning by the valve member, the apparatus can be simplified and downsized.

[Brief description of the drawings]

FIG. 1 is an overall view of a coating gun.

FIG. 2 is an enlarged view of a gun body.

FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, showing a nozzle portion.

FIG. 4 is a view as viewed from B in FIG. 3;

[Explanation of symbols]

1. 1. Gun body Nozzle part 3. Paint circuit, 4. Cleaning circuit 6. 7. valve chamber; Valve stem 9. Cleaning liquid passage, 10, 20a. Paint supply path 22. Orifice member, 24. Through holes 25, 26. Orifice orifice.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B05B 15/02 B05B 7/02

Claims (1)

(57) [Claims] 1. A coating gun in which a valve chamber and a paint supply path inlet inside a gun body can be freely opened and closed by a valve member, and the valve member selectively supplies paint and a cleaning liquid to a tip nozzle. , The nozzle portion penetrates the inside
A pair of orifice injection holes are provided at both ends of the through-hole, and a liquid-tight orifice member that can be inverted in the housing is provided, and the ends of the optical cable face each other outward.
Provide a pattern detection member that looks like a pair and looks like a pair,
If the injection pattern is normal, from one orifice injection hole
Spray injected from the other orifice through the through hole
The optical path is interrupted by the particles and the orifice member does not reverse,
If the injection pattern is abnormal, the optical path is conducted and the orifice
The orifice member is turned over and the other orifice injection hole is turned into the gas.
Face the paint supply path outlet of the main body.
A coating gun characterized by being sprayed from an orifice injection hole .