JPH0315160Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a liquid ejection device that can automatically remove clogging of a nozzle in a liquid ejection device such as a paint sprayer.

[Conventional technology]

Conventionally, for example, in the case of a coating machine as a liquid discharging device, the nozzle installed in the nozzle tip for spraying paint is formed into a minute diameter hole. There is a problem in that paint particles, dust, etc. adhere to the upstream side, causing the nozzle to become clogged. Therefore, periodically or whenever the nozzle becomes clogged, remove the nozzle tip from the main body of the sprayer and clean it with a solvent such as thinner, or turn the nozzle tip by hand to move the tip of the nozzle tip to the upstream side of the paint passage. for,
Pressurized paint is supplied to remove paint particles adhering to the nozzle of the nozzle chip to the outside using hydraulic pressure.

However, with the method of removing the nozzle tip from the sprayer body or manually reversing the nozzle tip to remove clogged nozzles, even when the sprayer is attached to an industrial robot etc. It has the disadvantage that it requires labor each time it is removed, that the painting work cannot be completely automated, and that the work efficiency of the operator cannot be improved.

[Problem that the invention attempts to solve]

The present invention was developed in view of the above-mentioned shortcomings of the prior art, and the problem that the present invention attempts to solve is to provide liquid ejection that automatically removes the clogging when the nozzle of the nozzle chip becomes clogged. The goal is to provide equipment.

[Means for solving problems]

The configuration adopted by the present invention in order to solve the above-mentioned problems includes a liquid ejecting device main body, a nozzle tip rotatably provided on the liquid ejecting device main body,
a piping system for supplying liquid to the dispensing device main body; a hydraulic pressure detector provided in the piping system for detecting the hydraulic pressure of the liquid; and a signal from the hydraulic pressure detector disposed in the dispensing device main body. and an actuator for rotating the nozzle tip.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, a coating machine will be taken as an example of an embodiment of the present invention, and the present invention will be described in detail based on the drawings.

A first embodiment of the present invention is shown in FIGS. 1 to 3.

In the figure, reference numeral 1 denotes a sprayer main body in which a paint passage 2 is bored in the axial direction, and a hollow cylindrical nozzle mounting member 4 is provided at the tip of the sprayer main body 1 via a sheet member 3. The nozzle mounting member 4 has a through hole 5 formed in the radial direction into which a rotating member 7, which will be described later, is inserted. The nozzle mounting member 4 and the seat member 3 are integrally fastened to the atomizer main body 1 by a lock ring 6.

Reference numeral 7 denotes a cylindrical rotating member which is rotatably inserted into the through hole 5 of the nozzle mounting member 4 with its upper and lower ends protruding in the radial direction. A stepped hole 7A communicating with the passage 2 is bored through the passage 2 in the radial direction. In addition, a square hole 7B into which a fitting portion 14C of a rotating shaft 14, which will be described later, is fitted is bored in the center of the upper end of the rotating member 7 in the axial direction.
A bottomed round hole 7C is bored in the axial direction at the center of the lower end. A nozzle chip 8 having a nozzle 8A having a minute diameter drilled in the axial direction is fitted into the stepped hole 7A.

Reference numeral 9 denotes a support member for supporting the rotary member 7, and the support member 9 has a fitting hole 9A open at both ends into which the nozzle mounting member 4 is fitted, and a fitting hole 9A on the base end side of the support member 9. The recesses 9B and 9C are located on the upper and lower sides of the fitting hole 9A in the radial direction, and the recesses 9B and 9C are located above the upper recess 9B and are bored in the vertical direction. A shaft insertion hole 9D into which the lower small diameter portion 14B is inserted and a female threaded portion 9E located on the opposite side of the shaft insertion hole 9D are provided. The support member 9 is externally fitted onto the nozzle mounting member 4, and the distal end thereof is inserted into the round hole 7C of the rotating member 7, and the set screw 1 is screwed into the female threaded portion 9E.
0 to the nozzle mounting member 4 via the rotating member 7.

Reference numeral 11 denotes an air-operated actuator provided above the lock ring 6 from the support member 9 via a mounting bracket 12 fixed to the upper end of the distal end surface of the support member 9;
Inside the cylindrical casing 13, which has both upper and lower sides closed, is located at the center and has small diameter sections 14A and 14B on both the upper and lower sides, and a lower small diameter section 14.
A rotary shaft 14 having a protruding prismatic insertion portion 14C is rotatably inserted into the tip of B. The lower small diameter portion 14B of the rotating shaft 14 is inserted into the shaft insertion hole 9D of the support member 9, and the insertion portion 14C is fitted into the square hole 7B of the rotating member 7. and the rotating member 7 are designed to rotate together.

Reference numeral 15 denotes a rotor blade located inside the casing 13 and fixed to one side in the radial direction of the rotary shaft 14, and a sealing member that slides on the inner circumferential surface of the casing 13 is provided at the tip of the rotor blade 15. , the rotary blade 1
5 rotates integrally with the rotating shaft 14 in the direction of arrow A in the figure. 16A and 16B are in contact with the rotor blade 15, so that the rotor blade 15
Casing 1 so that it can only rotate within a range of 180 degrees.
A stopper member 17 is provided protruding from the inner peripheral surface of the casing 13, and a spacer 17 is located on the opposite side of the rotary blade 15 via the stopper members 16A and 16B and has a substantially fan-shaped cross section and is disposed in the axial direction of the casing 13. A pressure chamber 18 is provided between the spacer 17 and the rotary blade 15 in contact with each stopper member 16A, 16B.
A and 18B are formed. In the figure, 19, 20
are seal members provided between the spacer 17 and the rotating shaft 14 and between the spacer 17 and the inner peripheral surface of the casing 13, respectively.

Reference numerals 21 and 22 are ventilation passages formed in the radial direction of the casing 13 so as to communicate with the pressure chambers 18A and 18B. Air for eight rotations of the nozzle tip is supplied to the ventilation passage 21 on one side, and the ventilation passage on the other side is connected to the pressure chambers 18A and 18B. Air for reversing the nozzle tip 8 is supplied to 22.

23 and 24 are air pipes for supplying air to actuate the actuator 11;
One end of 24 is connected to a directional switching valve 25 made of a solenoid valve, and the other end is connected to each of the air passages.
The directional switching valve 25 is connected to an air source 27 via an air pipe 26 and also to a control device 28, and according to a command from the control device 28, air from the air source 27 is directed to each air pipe 23, 24. It is now being selectively supplied to

Reference numeral 29 denotes a paint pipe, one end of which is connected to a paint source 30, and the other end connected to the coating machine body 1. 31 is a hydraulic pressure detector provided in the middle of the paint pipe 29;
is connected to the control device 28, and when the fluid pressure in the paint pipe 29 exceeds the set pressure, the control device 2
It is designed to send a signal to 8. Further, 32 is an air pipe provided between the air pipe 26 and the coating machine main body 1, and a control valve 33 consisting of a solenoid valve is provided in the middle of the air pipe 32, and the control valve 33 is connected to the control device 28. In response to this signal, the supply of air from the air source 27 to the coating machine body 1 is cut off. Note that 34 is an actuator that opens and closes the paint passage 2 of the sprayer main body 1.

The present embodiment is constructed as described above, and its operation will be explained next.

When the nozzle 8A of the nozzle tip 8 is in a normal state with no clogging, the hydraulic pressure of the paint supplied from the paint source 30 to the paint sprayer body 1 via the paint pipe 29 is maintained within the set value. , a normal state signal is sent from the hydraulic pressure detector 31 to the control device 28, the control valve 33 is also in the open state, and the air source 2 is in the open state.
Air from 7 is supplied to the actuator 34 of the coating machine main body 1 via the air pipe 26, control valve 33, and air pipe 32 in this order, and the paint passage 2 is in an open state.

Further, the directional control valve 25 directs air from the air source 27 to the air pipe 26 according to a signal from the control device 28.
The air is supplied to the air pipe 24 side from the air pipe 24 side. Then, the rotor blade 15 is rotated by the air pressure of the air supplied from the other side air passage 22 of the actuator 11 to the pressure chamber 18B of the casing 13, and the rotor blade 15 is rotated to the state shown in FIG. It is located in the state.

On the other hand, during painting work, nozzle tip 8
If A becomes clogged, paint pipe 2
The hydraulic pressure inside 9 increases. And the hydraulic pressure detector 31
A signal from the controller 28 causes the paint pipe 2 to
When it is determined that the hydraulic pressure in the valve 9 exceeds a set value, a signal is sent to the directional control valve 25 and the control valve 33. The control valve 33 is closed by this signal, and the supply of air from the air source 27 is cut off. As a result, the actuator 34 of the sprayer body 1 is activated, the paint passage 2 is closed, and the spraying action is stopped. . On the other hand, directional control valve 2
5 cuts off the communication between the air pipe 26 connected to the air source 27 and the air pipe 24, and allows the air pipe 23 to communicate. As a result, air from the air source 27 is supplied from the air passage 21 into the pressure chamber 18A of the actuator 11 via the air pipe 26, the directional switching valve 25, and the air pipe 23 in this order. The rotary blade 15 is rotated by air pressure until it comes into contact with the stopper member 16B, and as a result, the rotary member 7 is also rotated 180 degrees via the rotary shaft 14 that rotates together with the rotary blade 15, and the tip of the nozzle tip 8 is It faces the paint passage 2 (see Figure 3).

Thereafter, a signal from the control device 28, e.g. by time management, is sent to the control valve 33, which opens and air from the air source 27 is supplied to the actuator 34 of the sprayer body, and the paint passage is 2 opens. As a result, paint is supplied to the nozzle tip 8 which is in the opposite direction to the normal state, and paint particles etc. adhering to the inside of the nozzle 8A are gradually removed to the outside by the hydraulic pressure. Then, when the clogging in the nozzle 8A is cleared and the liquid pressure in the paint pipe 29 returns to the initial setting value, the control device 28 determines the clogging cleared state based on the signal from the liquid pressure detector 31, and The control device 28 sends signals to the control valve 33 and the directional control valve 25. The control valve 33 is closed by the signal, and the actuator 34 is operated as described above to shut off the paint passage 2 of the paint sprayer and stop the spraying of paint from the nozzle tip 8 which is in the reverse direction. At the same time, the directional switching valve 25 cuts off communication between the air source 27 and the air pipe 23 and allows the air pipe 24 to communicate with the air source 27. Thus, air from the air source 27 flows through the air pipe 26, the directional control valve 25, and the air pipe 2.
4 and the air passage 22 of the actuator 11 in sequence.
As a result, the rotor blade 15 located at the position shown by the dashed line in FIG. 3 is reversed and returned to the position shown by the solid line, and the nozzle tip 8 is also reversed to its normal position where it can be painted. After that, the control device 2
The control valve 33 is opened by the signal from 8, actuating the actuator 34, and opening the paint passage 2, thereby returning to the normal painting operation state.

As described above, according to this embodiment, the coating machine main body 1
If the nozzle 8A of the nozzle chip 8 installed at After rotating the nozzle 8A by 180 degrees, pressurized paint is passed through the nozzle 8A to remove the clogging, so that unmanned painting work and improved efficiency of painting work can be realized.

FIG. 4 shows a second embodiment of the invention.

The second embodiment is characterized in that a pulley 41 is pivoted on the rotating member 7 instead of the air-operated actuator 11 in the first embodiment, and the belt 4
2, an actuator 43 for rotating the pulley 41 is provided on the base side of the main body 1 of the coating machine.

According to this embodiment configured as described above, the weight applied to the front end side of the coating machine main body 1 can be reduced, and the workability of the coating machine can be improved.

Although each embodiment has been described using a coating machine as an example, the present invention is not limited to this and can be applied to various liquid ejecting devices. Further, in this embodiment, air-operated actuators are used as the actuators 11 and 43, but the present invention is not limited to this, and an electric actuator such as a rotary solenoid or a motor may also be used.

[Effects of the invention] Since the present invention is configured as detailed above, the nozzle tip of the liquid ejection device can be automatically clogged, and as a result, painting work, etc. can be automated, and work efficiency can be improved. It is possible to improve the performance and reduce the burden of labor.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, FIG. 1 is an overall configuration diagram showing a coating machine, FIG. 2 is a vertical sectional view of main parts of the coating machine, and FIG. An enlarged sectional view in the direction of the − arrow in the figure, FIG.
It is a partial sectional view showing an example of. 1... Painter main body (liquid discharge device), 8... Nozzle chip, 11, 41... Actuator, 2
9...Paint pipe (piping system), 31...Liquid pressure detector.

Claims (1)

[Scope of utility model registration request] A liquid discharging device main body, a nozzle chip rotatably provided on the liquid discharging device main body, a piping system for supplying liquid to the discharging device main body, and a piping system provided in the piping system for detecting the liquid pressure of the liquid. A liquid ejection device comprising: a liquid pressure detector; and an actuator, which is provided on the main body of the ejection device and rotates the nozzle tip in response to a signal from the liquid pressure detector.