JPS5837857B2 - Paint coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paint coating apparatus, and more particularly to a paint coating apparatus having a coating cleaning means.

The coating agent here refers to carburizing agents and sealants. glue. It refers to a relatively high viscosity paint such as a cream-like liniment, and a detergent is a cleaning liquid in which a commercially available detergent is dispersed or dissolved. This refers to organic solvents, water, etc.

For example, when carburizing a steering gear 1, which is an automobile part, as shown in Fig. 1, it is necessary to prevent brittleness of the teeth by applying a carburizing agent to the bottom surface 1a of the teeth of the rack. There is.

As this carburizing material, for example, a high viscosity paint consisting of a mixture of copper powder and metal oxide filler of 35 mm or less, about 15% sodium sulfate, and residual water is used.

The coating device introduces pressurized air into a pressurized container that stores the coating material, pressurizes the coating material, and pumps it to the coating material discharging device, and opens and closes the coating material discharging valve of the coating material discharging device. There is a known type that controls the discharge of coating material from a nozzle by controlling the amount of the coating material.

In such coating equipment, when the equipment is stopped, the highly viscous paint solidifies and adheres to the inside of the equipment, especially the valves and inner surfaces of the piping, which not only hinders the restart of the application equipment but also causes problems. However, there is a problem in that coagulated substances are scattered in the coating material, making it impossible to form a normal coating film.

Therefore, in order to solve these problems, it is necessary to wash the inner surface of the coating device with a solvent immediately after the coating is finished, resulting in a large amount of man-hours.

This invention has been made in view of the above points, and includes a storage container for storing a coating agent cleaning liquid attached to the coating device, so that when the supply of the article to be coated is stopped and the carburizing agent coating process is completed, After the cleaning liquid is transferred from the storage container and filled into the pressurized container from which the paint has been discharged, the cleaning liquid is discharged from the paint discharging device to clean the inner surface of the pipe line after the pressurizer and the paint discharging device. To provide a coating material application device which solves the drawbacks of conventional devices by making the inner surface of the device substantially dry by air blowing after cleaning.

The present invention will be explained below with reference to embodiments shown in FIGS. 2 to 4.

First, referring to FIG. 2, 10 is a pneumatic switching valve, 11.1
2 are speed regulating valves, and 13 is an air cylinder having a piston 14 and a piston rod 15 that moves together with the piston 14.

Reference numeral 20 denotes a paint discharging device, the details of which are shown in FIG. It has a nozzle device part 21c attached to the body part 21b, and inside the body part 21b, there is a 1000-yen bar 22 for retaining the paint communicated from the paint supply port 24 through the paint passage 25. has been done.

A shutoff/suction valve 26 is provided in the paint passage 25 to open and close it.
A nozzle 23 having a paint passage 23b communicating with the cutoff/suction valve 26 and a discharge port 23a is attached to the nozzle device section 21c.

The shutoff/suction valve 26 is provided at the lower end of a valve rod 27 extending through the upper part of the body 2lb, and the valve rod 27 is connected to the piston rod 15 by a connecting rod 16 and moves therewith.

28 is a sealing member for preventing the intrusion of dust, etc.; 29a. 29b
is an O-ring to prevent paint from flowing out.

Reference numeral 30 denotes a pressurized container, the details of which are shown in FIG. A drug injection port 34 is provided.

A paint container 35 is installed inside the main body 31, and the paint 3 is injected from the paint inlet 34 and stored therein.

A pipe 17 is fixed to the side of the main body 31, through which air pressure is introduced into the pressurized container 30.

Reference numeral 18 denotes a pressure feed pipe inserted into the paint container 35 through the lid body 32, and the paint 3 is delivered to the paint supply port of the paint discharging device 20 via the pressure feed pipe 18 and the pipe line 19 as described later. 24.

Reference numeral 36 denotes a floating lid having a paint flow port 36a, in which the paint 3
Made of a material with lower specific gravity.

37 and 38 are rods and electric wires that extend into the paint container 35 and have a detection section 37a at the tip. 38a is attached to the coating material detector, and the height of the detection portion 38a is set at a position corresponding to the amount of coating material corresponding to a series of operating times.

39a and 39b are O-rings for sealing.

Although not shown, it is preferable to install a mower on the lid 32 of the pressurized container 30 to rotate an impeller provided in the paint 3 in the container to agitate the paint 3. .

Furthermore, in FIG. 2, 40 is an air pressure reduction regulating valve that arbitrarily adjusts the air pressure sent to the pressurized container 30, 41 is its gauge,
Reference numeral 42 denotes a two-port two-position switching valve, which is provided in a passage connecting the pressurized container 30 and the air pressure reduction regulating valve 40.

Reference numeral 43 indicates an article detection switch for detecting whether or not there is an article 2 to be coated below the nozzle 23, and 44 indicates an air pipe.

50 is a storage container for the cleaning liquid 4, which includes a main body 51 and a lid 52.
and fixing tool 53a. 53b, and
The lid body 52 has a cleaning liquid inlet 5 that is sealed by a lid 53.
4 is provided, and the cleaning liquid 4 is injected from the injection port 54 and stored.

Reference numeral 55 denotes an air supply pipe that penetrates the lid 52 and opens into the cleaning liquid storage container 50, and air pressure is introduced into the storage container 50 via the switching valve 45.

A pipe 56 is fixed to the side of the main body 51, and has 2 ports 2
It communicates with the pressurized container 30 via the position switching valve 46 and the pipe 17.

Reference numerals 57 and 58 indicate a cleaning liquid detector in which a rod and an electric wire extend into the storage container 50, and detecting parts 57a and 58a are attached to the tips, and the height of the detecting part 58a is the amount of cleaning liquid used in the cleaning process, i.e. , is normally set at a position suitable for a liquid volume several times that of the pressurized container 30.

59a and 59b are O-rings for sealing.

Note that, instead of providing the switching valves 42 and 46, a three-way switching valve may be provided at the intersection of the air introduction path, the cleaning liquid pumping path, and the pipe 17.

Next, the operation of the above-mentioned embodiment constructed in this way will be explained.

The pressurized container 30 is filled with the paint 3, and the liquid level is detected by the detection unit 37a. The paint detector 37.3 is between 38a and 38a.
8, and when the article 2 to be coated is placed on a moving table or conveyor, moves in the direction of the arrow, reaches below the nozzle 23, and is detected by the article detection switch 43, a control panel (not shown) A coating command signal is issued, which excites the electromagnetic drive member 10a and causes the pneumatic switching valve 10 to switch to the second position.
At the upper position shown in the figure, pressurized air is supplied from the pressure source [F] to the upper part of the air cylinder 13 via the speed regulating valve 11, and the lower part communicates with the atmosphere [F], so the piston 14 descends. Simultaneously, the shutoff/suction valve 26 in the paint discharging device 20 is also lowered to open the paint passage 25.

At this time, the switching valve 42 is in the left position as shown in the figure and is open, and the air switching valve 45. The switching valve 46 is closed at the left position as shown in the figure, and pressurized air is sent to the pressurized container 30 via the air pressure reduction adjustment valve 40, and the paint 3 is forced into the pressure feed pipe 18. Conduit 19
The paint is supplied to the paint discharging device 20 via.

Therefore, the coating material 3 is press-fitted into the 1000 yen bar 22 from the passage 25, and the coating material stored in the 1000 yen bar 22 is discharged from the discharge port 23a of the nozzle 23, and is applied in a band shape to a predetermined location on the upper surface of the article 2. .

FIG. 2 shows the state of this paint application process.

When the article 2 has finished passing under the nozzle 23, the article detection switch 43 is turned off, and the pneumatic switching valve 10 is thereby switched from the upper position shown in the figure to the lower position according to a command from a control panel (not shown), and the air pressure Switch the connection pipes to source ■ and atmosphere ■.

As a result, the piston 14 rises, and the shutoff/suction valve 26 also rises and fits into the paint passage 25, blocking this passage and stopping the discharge of the paint, and at the same time the switching valve 42
is switched from the illustrated position to the right position, and the inside of the pressurized container 30 is no longer pressurized.

When a series of scheduled coating steps is completed and the line is stopped, the liquid level of the coating material 3 in the pressurized container 30 is at a level below the detection part 37a.

This state and the level of the cleaning liquid 4 in the storage container 50 reaching the detection part 58a are confirmed by the detectors 37 and 58, and the component detection switch 43 is in the inactive state and the article 2 is detected. When it is confirmed that the line is not at the coating position, a control panel (not shown) receives these confirmation signals and issues a cleaning liquid transfer command signal based on the line stop signal, thereby starting the cleaning liquid transfer process.

At this time, the electromagnetic drive member 10a of the pneumatic switching valve 10 is deenergized, the switching valve 10 is in the lower position, the piston 14 of the air cylinder 13 moves upward and reaches the top dead center, and the paint discharging device 2
0 shutoff/suction valve 26 closes.

At the same time, the switching valve 42 is closed in the right position, the switching valve 45, the switching valve 4
6 are opened at the right position, and the cleaning liquid 4 in the storage container 50 is forced into the pressurized container 30 by pressurized air.

At this time, the lid 33 is loosened somewhat to prevent an increase in air pressure inside the container.

Here, when the liquid level detector 38 detects that the cleaning liquid level has reached the detection part 38a, a cleaning start signal is sent from the control panel in response to the detection signal, and the air switching valve 10 is set to the upper position as shown in the figure and the air is turned off. The cylinder 13 moves to the bottom dead center position, and the shutoff/suction valve 26 of the paint discharging device 20 opens.

At the same time, as shown in the figure, the switching valve 42 is opened in the left position, and the switching valve 7 is opened in the left position.
45, the switching valve 46 is closed in the left position even if it is tilted, and the transfer of the cleaning liquid 4 from the storage container 50 is stopped, and the cleaning liquid in the pressurized container 30 is removed by the pressurized air supplied through the switching valve 42. is force-fed to the paint discharging device 20, cleans the inside thereof, and discharged from the nozzle 23.

Note that during the cleaning process, the cleaning liquid 4 discharged from the nozzle 23
The water flows out into a drainage ditch through a drainage hose coupled to the discharge port 23a, or flows into a large drainage tank placed on a movable truck and is disposed of.

The above-described cleaning liquid transfer process and cleaning process are repeated for several cycles as long as the cleaning liquid level in the storage container 50 is between the detection parts 57a and 58a.

When the liquid level detector 57 detects that the liquid level has fallen below the detection part 57a, a detection signal is sent to the control panel, a command signal is issued from the control panel, and the cleaning process is completed.

When the cleaning process is completed, the cleaning liquid level in the pressurized container 30 and the storage container 50 is detected by the detection parts 37a and 5 of the liquid level detector 37.57.
7a or less, the pneumatic switching valve 10 is in the upper position and the cutoff/suction valve 26 of the paint dispensing device 20 is open, and the switching valve 42 is in the right position, closing the switching valve. 45. The switching valves 46 are all opened in the right position, and air is blown between the storage container 50 and the paint discharging device 20.

This is the first air blowing step.

After the start of the first airflow process, when a timer installed on the control panel has elapsed for a predetermined period of time (for example, 3 minutes), the pneumatic switching valve 10 remains in the upper position and the switching valve 42 moves to the left position and opens.
Switching valve 45. The switching valves 46 are all in the left position and closed,
A secondary air blow is performed on the pressurized container 30, the piping and the inside of the device after it for a predetermined period of time (for example, 3 minutes), and the cleaning liquid adhering to the piping and the inside of the device is discharged to the outside of the system, leaving the inside almost dry. Make it.

In the embodiment described above, the pressure feeding means introduces pressurized air into the cleaning liquid storage container 50 to pressurize the cleaning liquid in the storage container 50 and discharge it from the pipe 56. The end of the air supply pipe 5 on the outlet side is connected to an air motor, and a rotary pump or a reciprocating pump driven by the air motor is connected to the storage container 50 of the pipe 56 (FIG. 2).
It may also be constructed by interposing it on the side.

However, it is preferable to maintain the inside of the storage container 50 at atmospheric pressure by means such as looking through the O-ring 59a of the storage container 50.

In this case, the operation and stop of the pump are controlled by the switching operation of the switching valve 45 in the same way as in the cleaning liquid transfer step, and the first air blowing step is performed by performing the above-mentioned secondary air blowing. do.

It is clear that an electric motor may be used instead of the air motor.

As described above, according to the present invention, it is possible to automatically and quickly clean the coating device, which conventionally required troublesome work and a large number of man-hours, and prepare it for the next coating process. This has the excellent effect of facilitating maintenance of coating equipment that uses high-viscosity coating materials.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of an article to which a coating material is applied by the apparatus according to the present invention, FIG. 2 is an explanatory diagram showing an embodiment of the invention, and FIG. 3 is a coating material in the embodiment of FIG. FIG. 4 is a cross-sectional view showing details of the discharge device, and FIG. 4 is a cross-sectional view showing details of the pressurized container in the embodiment of FIG. 2... Goods, 3... Paint, 4...
...Washing liquid, 10...Pneumatic switching valve, 13...
... Air cylinder, 14 ... Piston, 1
5... Piston rod', 20... Paint discharging device, 23... Nozzle, 26...
・Shutoff and suction valve, 30... Pressurized container, 40...
...Air pressure reduction regulating valve, 42.45,46...
・Switching valve, 43... Article detection switch, 50.
...Storage container.

Claims (1)

[Scope of Claims] 1. A coating material discharging device having a nozzle having a coating material discharging port and a valve that is moved to a first position for opening and a second position for blocking a coating material supply passage to the nozzle. a pressurized container that stores a coating material and introduces pressurized air to pressurize the coating material and feed it to the coating material discharging device; and a first valve of the coating material discharging device.
A coating material application device comprising a valve driving device for moving the valve to a first position and a second position, and a switching device for the valve driving device for moving the valve to a first position and a second position. A storage container for storing a cleaning liquid, a pressure-feeding means for force-feeding the cleaning liquid in the storage container to the pressurized container, and a valve means for alternately switching between a pressure-feeding path for the cleaning liquid and a path for introducing air into the pressurized container. A paint application device comprising: 2. The paint coating device as set forth in claim 1, wherein the pressure feeding means is means for introducing pressurized air into the cleaning liquid storage container.