JPH0462787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a spray gun that sprays paint in the form of a mist from a paint spout in a flat fan-shaped spray pattern. This invention relates to a device for changing the direction of a spray gun's spray pattern, which allows the spray gun to change its direction.

Conventional technology and problems to be solved by the invention Conventionally, a spray gun with a flat fan-shaped spray pattern of paint is attached to an arm that moves in three dimensions by the drive of a plurality of actuators, and the arm is moved in any direction. In such a painting robot, an actuator is installed at the end of the arm in order to orient the flat direction of the paint spray pattern in an appropriate direction with respect to the movement direction of the spray gun that moves according to the shape of the object to be painted. This actuator was used to rotate the spray gun around its axis, but the drive mechanism was complicated and expensive.

The present invention eliminates these drawbacks and allows the flat direction of the paint spray pattern to be changed even when the spray gun is fixed to the arm without rotating around its axis, simplifying the drive mechanism of the painting robot. It is an object of the present invention to provide a device for changing the direction of a paint jet pattern of a spray gun, which can change the direction of a paint jet pattern of a spray gun.

Embodiment Hereinafter, an embodiment in which the present invention is applied to an air electrostatic spray gun will be described with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a gun body, in which a screw hole 3 formed with a reduced diameter at the rear of a device hole 2 opened at the tip surface communicates with a paint passage 5, and a valve communicating with this paint passage 5. A valve seat 7 having a port 6 has a screw hole 3
A holding cylinder 12 has a through hole 8 on its rear end face communicating with the valve port 6 and a tapered mounting hole 10 on its front end face. Screwed in and abutted against the front end of the valve seat 7,
A nozzle 16 having a tapered part 14 on the outer periphery of the tip and a tapered part 15 on the outer periphery behind the nozzle 16 screws its rear end into a screw hole 17 formed at the inner end of the holding cylinder 12. The rear taper part 1
5 is tightly fitted and held in the mounting hole 10 of the holding cylinder 12, and the electrode needle 20 is placed in the center of the paint introduction hole 18 provided through the nozzle 16.
The distal end of the nozzle 16 is held by a retaining member 19 having a large number of ventilation holes fitted to the rear end of the nozzle 16 so as to protrude from the spout 21 formed protruding from the distal end of the nozzle 16 . A branch ring 22 is fitted around the holding cylinder 12 of the device hole 2 of the gun body 1, and this branch ring 22 is attached to the rear end surface of a thick-walled cylinder 23, as shown in FIGS. A partition ring 25 that partitions the end surface into an inner circumferential side and an outer circumferential side is formed in a protruding manner, and is open on the outer circumferential surface of the cylinder 23 as well as on both the front and rear end surfaces, with the openings at the rear end facing the outer circumferential side of the partition ring 25, respectively. A pair of ventilation holes 26, 26, and a pair of left and right ventilation holes 27, 27 that open on the inner peripheral surface of the cylinder 23 and open on both front and rear end surfaces, with the openings at the rear ends facing the inner peripheral side of the partition ring 25, respectively. are formed at 90 degree intervals in the circumferential direction, with the outer circumferential surface being the inner circumference of the device hole 2, the inner circumferential surface being the outer circumference of the holding cylinder 12, and the rear surface of the partition ring 25 being the device hole. 2, and a nozzle holder 30 having a center hole 43 and a conical surface 34 formed around the center hole 43 is formed on the rear surface of the tip of the nozzle 16. The rear-widening tapered mounting hole 31 is tightly fitted into the tapered part 14 at the tip of the nozzle 16 so that the jet nozzle 21 at the tip of the nozzle 16 protrudes from the center hole 43, and the rear end surface is connected to the tip surface of the branch ring 22. Inward facing tsuba 3 formed on the inner periphery of the tip
9 is a flange 29 formed on the outer periphery of the nozzle holder 30.
The hub nut 32 that is engaged with is screwed onto the outer periphery of the tip of the gun body 1. An annular air outlet 44 is formed between the nozzle 16 and an annular space 45 formed between the inner periphery of the tip of the nozzle holder 30 and the outer periphery of the air outlet 21 . and each ventilation hole 4 of the holding cylinder 12
6 and 47, it communicates with the air supply hole 48 formed in the gun body 1, and the valve opening 6 and the holding cylinder 12 are opened by the valve opening operation of the valve body 50 installed in the paint passage 5 of the gun body 1. The paint supplied to the spout 21 through the through hole 8 and the introduction hole 18 of the nozzle 16 is atomized by the air supplied from the air supply hole 48 of the gun body 1 and jetted from the air spout 44, and is heated to a high temperature. It is designed to be charged and ejected by the electrode needle 20 to which a voltage is applied. Four introduction holes 28 are formed on the outer circumference of the nozzle holder 30 at 90-degree intervals from the rear end surface, and communicate with each introduction hole 28 on the front axis of the nozzle 16 nozzle 21 . Four spout holes 33 pointing at one point
are formed at 90 degree intervals, and each introduction hole 2
8 is aligned with each ventilation groove 26, 27 of branch ring 22, and each jet hole 33, which corresponds to the upper and lower sides at 180 degree intervals,
33 is the introduction hole 28 and the ventilation groove 2 of the branch ring 22
6 communicates with an annular air pressure passage 35 configured on the outer circumferential side of the partition ring 25, and the respective jet holes 33, 33 corresponding to the left and right at 180 degree intervals are connected to the introduction hole 28 and the ventilation of the branch ring 22, respectively. Through the groove 27,
The first air supply hole 37 provided in the gun body 1 communicates with the annular air pressure passage 36 formed on the inner circumferential side of the partition ring 25, and the first air supply hole 37 provided in the gun body 1 communicates with the outer air pressure passage 3.
5, the second air supply hole 38 communicates with the inner air pressure passage 36, and each air supply hole 37, 3
8 is connected to each outlet port of a 3-port 2-position directional switching valve 41 connected to an air supply source 40, and when the directional switching valve 41 is switched, air is supplied to the first air supply hole 37. When air is ejected from the upper and lower ejection holes 33, 33 of the nozzle holder 30 along the conical surface 34 at the tip of the nozzle holder 30, and air is supplied to the second air supply hole 38,
Air is ejected from the left and right ejection holes 33, 33 of the nozzle holder 30 in the same manner along the conical surface 34 of the nozzle holder 30.

Therefore, when air is supplied to the first air supply hole 37 of the gun body 1 by switching the directional control valve 41, the paint flow atomized and ejected from the ejection port 21 is caused to flow from the upper and lower ejection holes 33, 33. The air jetted forward toward the center along the conical surface 34 is crushed from both the upper and lower directions, and is jetted in a vertically flat fan-shaped jet pattern. When supplied, the paint flow ejected from the ejection port 21 flows through the left and right ejection holes 33,
33 to the center along the conical surface 34, the air is crushed from both left and right directions, and is injected in a fan-shaped spray pattern that is flat to the left and right, and in this way, the flat direction of the spray pattern can be changed by 90 degrees by switching the directional control valve 41.

In this embodiment, two sets of jet holes 33, 33 are provided at 180 degree intervals so that the direction of the paint jet pattern can be changed by 90 degrees. By providing multiple sets, it is possible to change the direction of the spray pattern in multiple stages.

Structure and effects of the invention As specifically explained in the above embodiments,
The device for changing the direction of the paint spray pattern of the spray gun of the present invention changes the atomized paint ejected from the paint nozzle into a set of two devices arranged at 180 degree intervals around the paint nozzle. In a spray gun configured to eject in a flat sector-shaped spray pattern by an air flow that is ejected obliquely from the ejection hole toward a point in front of the paint ejection port, the set of ejection holes are positioned in the circumferential direction. Two or more sets are provided with staggered positions, and the two orifices forming the set are connected to a single pneumatic feed line for each set, and each of the pneumatic feed lines is connected to a pneumatic feed source via a switching valve. , the gist is that air is ejected by selecting any one set of the ejection holes by switching the switching valve, and by switching the switching valve, the flat direction of the spray pattern of the paint is changed. Conventionally, in painting robots in which a spray gun is attached to the tip of an arm that is driven in a three-dimensional direction and can be moved in any direction according to the shape of the object to be painted, The actuator installed at the tip rotates the spray gun around its axis to direct the flat direction of the paint spray pattern in the appropriate direction relative to the direction of movement of the spray gun. This has the effect that the structure of the drive mechanism is simplified because it is no longer necessary.

[Brief explanation of the drawing]

Fig. 1 is a front view of one embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a rear view of the branch ring, and Fig. 4 shows a partially assembled state. FIG. 21: Paint spout, 33: Spout hole, 35,3
6: Pneumatic feed line, 40: Air supply source, 41: Directional switching valve.

Claims (1)

[Claims] 1. Atomized paint ejected from a paint spout is directed toward a point in front of the paint spout from a pair of spout holes provided 180 degrees apart around the paint spout. In a spray gun configured to eject air in a flat sector-shaped ejection pattern by ejecting air obliquely, two or more sets of the one set of ejection holes are provided with positions shifted in the circumferential direction, and the two or more ejection holes forming the set are provided. Each set of ejection holes is connected to a single pneumatic feed line, and each pneumatic feed line is connected to a pneumatic feed source via a switching valve, and by switching the selector valve, any one set of the ejection holes is connected. A device for changing the direction of a paint jet pattern of a spray gun, characterized in that the device is configured to selectively eject air.