JPH0880459A - Filter for coating material - Google Patents

Abstract

PURPOSE: To install two filters in parallel in a flow passage for the coating material and even when one of the filters is used, to automatically backwash the other filter by using a part of the coating material with the operation of valves. CONSTITUTION: In a filter for coating material used for a device in which the coating material fed from the coating material feeder is ejected from a spray gun through a filter, the 1st filter 1 and the 2nd filter 2 installed in parallel in a feeding path for the coating material and accumulators are provided. The accumulators are made to communicate with each other by a line through the discharge holes of the filters and cleaning valves 27, 28. Further, they are connected through gate valves and throttle valves installed in series in lines branching from the lines downstream of discharge valves 23, 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtering device for a coating material provided with a cleaning circuit, and more specifically, two filtering devices are provided in parallel in a flow path of the coating material, and one of the filtering devices is provided in parallel. The present invention relates to a filtration device for a coating material, which can automatically backwash another filtration device by using a part of the coating material by operating a valve provided in the coating material circuit while using the filtration device. It is a thing.

[0002]

2. Description of the Related Art When canning beverages, foods, etc., it is necessary to prevent the can, which is a container, from being corroded by the contents, or conversely, preventing the components of the can material from being eluted into the contents and impairing the umami. For the purpose, the inner surface of the can has been coated with a coating material. No foreign matter is allowed in these coating materials. Therefore, the coating equipment
A filtration device is incorporated to remove foreign matter in the coating material.

Further, such coating work has been automated today, and the work to be coated transferred by a conveyor is continuously coated for a long period of time. Meanwhile, the screen of the filtering device arranged in the coating material supply line is gradually clogged with foreign matter. To eliminate this clogging,
In order to clean the line without stopping, a plurality of filtration devices are installed in parallel, the switching valve provided in the coating material supply pipe is operated, and any one filtration device is stopped,
The screen of the stopped filtration device was removed and cleaned. The operation and cleaning of these switching valves were performed manually by workers.

An example of such a conventional filtering device for coating material will be described with reference to FIG.
That is, FIG. 5 shows a conventional filtering device for coating materials. In the figure, reference numeral 70 indicates a first filtering device, 71 indicates a second filtering device, and the first filtering device 70 and the second filtering device 71 are provided in parallel with the flow path of the coating material, and have a structure. Are the same. Ie the first
The structures of the filtering device 70 and the second filtering device 71 are composed of a substantially cylindrical casing 72, a cylindrical screen 73 disposed inside the casing 72, a lid 74 and the like.

The coating material 76 stored in the coating material tank 75 is pumped up and pumped by a pump 77. And the coating material 7 which is sent under pressure
6 flows to either one of the first filtering device 70 or the second filtering device 71 by the first switching valve 78. Then, the coating material 76 from which the foreign matter is removed by either one of the filtering devices is pressure-fed to the ejection gun 80 via the second switching valve 79 and ejected from the ejection gun 80 toward the object to be coated,
Is applied.

In normal operation, either the first filtration device 70 or the second filtration device 71 is thus used,
The other filtration devices stand by in the ready state. Now, a procedure for temporarily cleaning the screen 73 of the first filtering device 70 which is clogged will be described.

First, the coating material flowing to the side of the first filtering device 70 is switched between the first switching valve 78 and the second switching valve 79 to change the flow of the coating material 76 to the second.
It switches to the direction to the ejection gun 80 via the filtering device 71. Next, the drain valve 81 of the first filtering device is opened to release the pressure in the first filtering device 70, and the coating material remaining inside is discharged. Next, the lid 74 of the first filtration device 70 is removed, the internal screen 73 is taken out, and the cleaning operation is performed.

Then, the screen 73 cleaned by the cleaning work is again attached to the casing 7 of the first filtering device 70.
2 and set the lid 74. Next, the first filtering device 70 that has been emptied by the cleaning work
In order to fill the inside with the coating material, the partition valve 82 is opened, and the coating material 76 whose flow rate is throttled by the throttle valve 83 is supplied to the first filtering device 7
After the air in 0 is sufficiently removed, the drain valve 81 and the partition valve 82 are closed, the cleaning work is completed, and the first filtering device 70 is in the standby state.

The throttle valve 83 changes the pressure of the coating material 76 flowing to the ejection gun 80 via the second filtration device 71 in use in the process of filling the inside of the first filtration device 70 with the coating material. To minimize the influence on the coating work. Further, the cleaning of the second filtering device 71 is also performed in the same manner as the above-described procedure, with the first filtering device and the second filtering device in the opposite positions.

[0010]

As described above,
The cleaning work in the conventional filtering device for coating materials is all performed manually by workers.
Therefore, if the work procedure is wrong, the ejection of the coating material from the ejection gun 80 is interrupted, causing defective products to be continuously supplied. In addition, during the cleaning work, the filtering device is disassembled and the screen is taken out to the outside, so a large amount of coating material is wasted, and high-pressure coating material is blown out from the filtering device, which is dangerous. However, there is a problem that it takes a long time, and improvement of these has been desired.

The present invention has been made in view of the above problems, and an object of the present invention is to provide two filtering devices in parallel in a flow path of a coating material and use either one of the filtering devices. Provided is a filtration device for coating material, in which a part of the coating material is automatically backwashed by operating a valve provided with another filtration device in the flow path of the coating material. That is the purpose. Another object of the present invention is to provide a filtering device for coating material, which is easy and safe to operate, and which allows a clogged screen to be cleaned and returned in a short time so that the coating material is not wasted during cleaning work. . Furthermore, the pressure sensor detects the clogging state of the screen, and based on the signal from the pressure sensor, the program entered in advance on the operation panel
It is an object of the present invention to provide a filtration device for coating material, which is automatically operated with a valve.

[0012]

The present invention has the following constitution in order to achieve the above object. In addition, the code | symbol attached with () displayed the code | symbol of the Example mentioned later in order to help understanding. That is, in a filtering device for a coating material, which is used in a device for ejecting a coating material supplied from a coating material supply device from an ejection gun (20) through a filtering device, (a) is parallel to a coating material supply path. A first filtration device (1) and a second filtration device (2), which are provided in, and (b) an accumulator,
(C) A first supply valve (17) and a second supply valve (18) provided in a pipeline for supplying a coating material from the coating material supply device to the first filtering device (1) and the second filtering device (2). And (d) the first filtering device (1) and the second
First discharge valve (23) provided in the discharge line of the filtration device (2)
And a second discharge valve (24), and (e) a first provided in the drain holes of the first filtration device (1) and the second filtration device (2).
Drain valve (25) and second drain valve (26), (f)
The accumulator communicates with the discharge holes of the first filtering device (1) and the second filtering device (2) through a first cleaning valve (27) and a second cleaning valve (28) by a pipe line, and further, The first exhaust (23) valve and the second exhaust valve (24) are connected via a throttle valve and a sluice valve that is provided in series in a pipeline branched from the downstream pipeline. It was a filter device for a coating material, which was a feature.

Further, in the filtering device for the coating material, the first filtering device (1) and the second filtering device (2)
The coating material filtering device was provided with a pressure sensor (33) for detecting the pressure of the coating material at the supply hole and the discharge hole.

Further, in the filtration device for coating material, the first drain valve (25) and the second drain valve (2
6), first supply valve (17), second supply valve (18), first
The discharge valve (23), the second discharge valve (24), the first cleaning valve (27), the second cleaning valve (28), and the sluice valve are opened and closed by the operation of the actuator by the operation signal from the operation panel (34). The filtration device for coating material is composed of a valve structure that operates.

[0015]

Next, the operation of the present invention will be described. In the present invention, since the filtering device for the coating material having the above-described configuration is used, even when one of the first filtering device (1) and the second filtering device (2) is in use,
Other filter devices can be automatically backwashed by utilizing a part of the coating material by operating a valve provided in the flow path of the coating material.

That is, the case of cleaning the second filtration device (2) during the normal coating material application operation using the first filtration device (1) will be described. First, the coating material is supplied from the coating material supply device. The coating material passes through the first supply valve by opening the first supply valve (17),
It is filtered by the first filtration device (1), and further the first discharge valve (2
By opening 3), it passes through the first discharge valve and is pressure-fed to the ejection gun (20), ejected from the ejection gun (20) toward the object to be coated, and normal coating operation is performed. In this state, all the valves except the first supply valve (17) and the first discharge valve (23) are closed.

Next, the ejection gun (2) is discharged from the first discharge valve (23).
The amount of coating material that passes through the throttle valve by branching from the coating material supply path to 0) and opening the sluice valve of the sluice valve and the throttle valve that are provided in series in the pipeline to the accumulator. That is, a small amount of coating material that does not affect the normal coating operation is branched and supplied to the accumulator, and pressure is accumulated in the accumulator. When the pressure is sufficiently accumulated in the accumulator, the sluice valve is closed.

Next, the second drain valve (26) of the second filtration device (2) is opened, and subsequently the second cleaning valve (28) provided in the pipe line connecting the discharge hole of the second filtration device and the accumulator. To open. As a result, the coating material accumulated in the accumulator becomes the second filtration device (2).
Backwash vigorously, and the foreign matter clogged in the screen is discharged from the first drain valve (26) out of the system. When the backwash is completed, the second cleaning valve (28) and the second drain valve (26) are closed, and the second filtering device (2) returns to the standby state.

When the first filtration device is washed while the second filtration device is in use, the same operation as this is carried out.
The first filtering device and the second filtering device may be reversed.

Further, the clogging of the screen of the filtering device can be detected by the pressure difference of the coating material detected by the pressure sensor (33) provided in the supply hole portion and the discharge hole portion of the filtering device.

The above-mentioned series of valve operations for backwashing the screen include the first drain valve, the second drain valve, the first supply valve, the second supply valve, the first discharge valve, the second discharge valve, The first cleaning valve, the second cleaning valve, and the sluice valve have a valve structure in which the opening and closing operation is performed by the operation of the actuator in response to an operation signal from the operation panel. It can be automatically performed based on the signal of.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed description will be given below with reference to the drawings showing an embodiment of a filtration apparatus for coating materials according to the present invention. FIG. 1 is a view showing a filter device for coating materials according to a first embodiment of the present invention. 2 and 3 show a first embodiment according to the present invention.
It is a figure which shows the procedure of cleaning of the filtration apparatus for coating materials of an Example. FIG. 4 is a view showing a filter device for coating material according to a second embodiment of the present invention.

In the figure, reference numeral 1 is a first filtering device, 2 is a second filtering device, and the first filtering device 1 and the second filtering device 2 are provided in parallel to a coating material supply path. And the structure is the same. That is, the first filtering device 1 and the second filtering device 2 have a substantially cylindrical casing 3
And a cylindrical screen 4 and a lid 5 arranged therein. In addition, the filter unit has a supply hole 1
a, 2a, discharge holes 1b, 2b, drain holes 1c, 2c are provided, the first drain valve 1 is provided in the drain hole 1c of the first filtering device 1, and the second drain valve 2c is provided in the drain hole 2c of the second filtering device. A drain valve 26 is provided

Reference numeral 6 is a first accumulator, and 7 is a second accumulator. The first accumulator 6 and the second accumulator 7 are piston type accumulators utilizing the compression spring force, which will be described in detail later.
The structure is the same for temporarily storing the coating material 14 used when backwashing the screen 4 of the filtration device. That is, the first accumulator 6 and the second accumulator 7 are composed of a substantially cylindrical cylinder 8, a piston 9, a U-cup seal 10, and a compression spring 1.
1 and the cover 12 and the like.

15 is a pump, and the pump 15 is a tank 1
The coating material 14 stored in 3 is pumped up and sent under pressure to the filtration device. The supply pipe 16 of the coating material connecting the pump 15 and the filtration device is branched into two, and the first supply valve 17 and the second supply valve 17 are provided in the supply pipe connected to the supply hole 1a of the first filtration device 1, respectively. A second supply valve 18 is provided in the supply line connecting to the supply hole 2a of the filtration device 2.

20 is a coating material 14 for the object to be coated.
Is a jet gun for jetting the water, and the jet gun 20 is connected to a filter device through a discharge valve via a discharge pipe line 21. That is, the first discharge valve 23 is provided in the discharge conduit 21 connecting the discharge hole 1b of the first filtering device 1 and the spray gun 20, and the discharge conduit 21 connecting the discharge hole 2b of the second filtering device 2 and the spray gun 20. The second discharge valve 24 is provided in each of the two
The discharge valve 23 and the second discharge valve 24 are joined together at the downstream side and then connected to the ejection gun 20.

Further, the above-mentioned accumulator is connected to the filtering device and the discharge pipe of the coating material. That is, the first accumulator 6 is connected to the discharge hole 1b of the first filtering device 1 via the first cleaning valve 27 by a pipe line,
Further, it is connected to a pipeline of a coating material branched downstream of the first discharge valve 23 via a first partition valve 29 and a first throttle valve 31. The second accumulator 7 is the second filtration device 2
Of the discharge hole 2b of the second exhaust valve 2 and the second cleaning valve 28, and is connected to a pipe branching downstream of the second exhaust valve 24 via the second partition valve 30 and the second throttle valve 32. There is.

The supply hole 1a and the discharge hole 1b of the first filtering device 1 and the supply hole 2a and the discharge hole 2 of the second filtering device 2 are also provided.
A pressure sensor 33 for detecting the pressure of the coating material is provided in each part b, and a signal detected by the pressure sensor is input to the operation panel 34. The operation panel 34 includes a microprocessor and the like, and includes a first supply valve 17, a second supply valve 18, and a first discharge valve 2.
3, second discharge valve 24, first drain valve 25, second drain valve 26, first cleaning valve 27, second cleaning valve 2
8. The actuators of the first sluice valve 29 and the second sluice valve 30 are respectively connected by signal circuits. The present embodiment is configured as described above.

Next, the operation of the embodiment configured as described above,
That is, the procedure for cleaning the filtering device will be described. A procedure for cleaning the second filtration device 2 when the normal coating operation of the coating material is performed using the first filtration device 1 will be described with reference to FIGS. 2 and 3.
First, the coating material 14 stored in the tank 13 is pumped up and pumped by the pump 15, passes through the first supply valve by opening the first supply valve 17, and is pumped to the first filtering device 1. . In the first filtering device 1, the screen 4 filters foreign matter in the coating material.

The filtered coating material is the first
Passing the first discharge valve by opening the discharge valve 23,
It is pressure-fed to the ejection gun 20 through the discharge pipe 21, ejected from the ejection gun 20 toward the object to be coated, and a normal coating operation is performed. In this state, all the valves except the first supply valve 17 and the first discharge valve 23 are closed.

Next, at the downstream side of the first discharge valve 23, the discharge line 21
By opening the second sluice valve 30 provided in the pipe path branching from the second accumulator 7, the coating material that has passed through the second throttle valve 32 has the force of the compression spring 11 of the second accumulator 7. The pressure is stored in the second accumulator 7 against the pressure. This state is shown in FIG.
When the pressure of the coating material 14 is sufficiently accumulated in the second accumulator 7, the second sluice valve 30 is closed.

Next, the second drain valve 26 of the second filtration device 2 is opened, and the second cleaning valve 28 is opened.
As a result, the coating material 14 accumulated in the second accumulator 7 enters the second filtering device 2 through the discharge hole 2b of the second filtering device 2, backwashes the screen 4, and adheres to the screen 4. The foreign matter is discharged from the second drain valve 26 to the outside of the system. This state is shown in FIG. When the backwash is completed, the second drain valve 26 and the second cleaning valve 28 are closed, and the second filtering device 2 is in the standby state.

When the first filtration device 1 is washed while the second filtration device 2 is in use, the same operation as this is performed.
The filtering device 1 and the second filtering device 2 may be reversed.

Further, in order to know the clogging state of the screen 4 of the filtering device, the supply holes 1a and 2a and the discharging hole 1 of the filtering device 1
It can be detected by the pressure difference of the coating material detected by the pressure sensor 33 provided at the parts b and 2b, and the cleaning operation may be performed when this value exceeds a certain set value.

Further, a series of valve operations for backwashing the screen of the above-mentioned filtering device is performed by the first drain valve 25, the second drain valve 26, the first supply valve 17, the second supply valve 18, the first discharge. Valve 23, second discharge valve 24, first cleaning valve 27,
The second cleaning valve 28, the first sluice valve 29, and the second sluice valve 30 have a valve structure in which the opening / closing operation is performed by the operation of the actuator according to the operation signal from the operation panel 34,
By inputting the operation procedure program into the operation panel in advance, all operations can be automatically performed based on the signal from the pressure sensor 33.

FIG. 4 shows a filter device for coating material according to a second embodiment of the present invention. The difference from the first embodiment is that in the first embodiment, a first accumulator 6 is provided for the first filtration device 1 and a second accumulator 7 is provided for the second filtration device 2, whereas In the second embodiment, one accumulator 40 is provided for the first filtering device 1 and the second filtering device 2, and one accumulator 40 corresponds. Therefore, only one sluice valve 41 and throttle valve 42 are required, and other configurations are the same as in the first embodiment. Therefore, the reference numerals used in the drawings are the same as those used in the first embodiment, and detailed description thereof will be omitted. Also, the operation is almost the same as that of the first embodiment, and the description thereof will be omitted.

Further, in the present embodiment, the structure of the accumulator is the piston type utilizing the compression spring force, but it is not limited to this. For example, a gas pressure may be used. Further, when the coating material is discharged from the accumulator, if the piston 9 of the accumulator is forcibly discharged by an actuator mechanism such as an air cylinder, the backwash pressure of the screen is increased and the cleaning effect is further enhanced.

[0038]

Since the filtering device for coating material of the present invention is configured as described above in detail, one of the two filtering devices provided in parallel in the flow path of the coating material is used. Even during use, backwashing can be automatically performed using a part of the coating material by operating a valve provided with another filtration device in the flow path of the coating material. Moreover, the operation is easy and safe, and the clogged screen can be cleaned and returned in a short time, and the waste of the coating material in the cleaning work can be reduced. In addition, the pressure sensor detects the clogging state of the screen, and based on the signal from the pressure sensor, the program entered in the operation panel automatically operates the valve automatically. A filtration device can be provided.

[Brief description of drawings]

FIG. 1 shows a filter device for coating materials according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a cleaning procedure of the first embodiment according to the present invention.

FIG. 3 is a diagram showing a cleaning procedure of the first embodiment according to the present invention.

FIG. 4 shows a filter device for a coating material according to a second embodiment of the present invention.

FIG. 5 is a view showing a conventional filtering device for coating materials.

[Explanation of symbols]

1 ... 1st filtration apparatus, 2 ... 2nd filtration apparatus, 6 ... 1st accumulator, 7 ... 2nd accumulator, 15
... pump, 17 ... first supply valve, 18 ... second supply valve,
20 ... Jet gun, 23 ... 1st discharge valve, 24 ... 2nd discharge valve, 25 ... 1st drain valve, 26 ... 2nd drain valve,
27 ... 1st cleaning valve, 28 ... 2nd cleaning valve, 29 ... 1st gate valve, 30 ... 2nd gate valve,
31 ... First throttle valve, 32 ... Second throttle valve, 33 ... Pressure sensor, 34 ... Operation panel, 40 ... Accumulator, 41 ... Partition valve, 42 ... Throttle valve,

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display B05C 11/10

Claims (3)

[Claims] 1. A filtering device for a coating material, which is used in a device for ejecting a coating material supplied from a coating material supply device from an ejection gun through a filtering device, comprising: (a) parallel to a coating material supply path. A first filtering device (1) and a second filtering device (2) provided in (b) an accumulator, (c) a coating material supplying device to the first filtering device (1) and the second filtering device (2) A first supply valve (17) and a second supply valve (18) provided in a pipe line for supplying a coating material to the head, and (d) a discharge pipe of the first filtration device (1) and the second filtration device (2) The first discharge valve (23) and the second provided in the passage
A discharge valve (24), (e) a first drain valve (25) and a second drain valve (26) provided in drain holes of the first filtering device (1) and the second filtering device (2), f) The accumulator communicates with the discharge holes of the first filtering device (1) and the second filtering device (2) via a first cleaning valve (27) and a second cleaning valve (28) by a pipe line, Furthermore, the first exhaust valve (23) and the second exhaust valve (24) are connected to each other through a sluice valve and a throttle valve that are provided in series in a pipeline branched from the downstream pipeline. A filtration device for coating materials, which is characterized in that 2. A pressure sensor (33) for detecting the pressure of the coating material is provided in the supply hole portion and the discharge hole portion of the first filtration device (1) and the second filtration device (2), A filtration device for the coating material according to claim 1. 3. A first drain valve (25) and a second drain valve (26), a first supply valve (17), a second supply valve (18),
The first discharge valve (23), the second discharge valve (24), the first cleaning valve (27), the second cleaning valve (28) and the sluice valve are actuated by the actuator from the operation panel (34). The filtering device for coating material according to claim 1 or 2, which has a valve structure in which opening and closing operations are performed by the method.