JP2003080666A - Filter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter device capable of shortening the time required in the replacement of a filter and capable of being operated efficiently. SOLUTION: In the filter device 1 constituted so that filters 8-10 for removing foreign matter in dampening water used in offset printing are provided in a replaceable manner and dampening water is allowed to flow out of an outflow pipeline 11 from inflow pipings 2-4 through the filters 8-10 in housings 5-7, a changeover valve 18 for supplying either one of dampening water and air for removing dampening water is provided to the inflow pipelines 2-4. Dampening water can be rapidly removed from the filters 8-10 without waiting the dropping of dampening water under its own weight to rapidly replace the filters 8-10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dampening water circulating treatment device for treating dampening water used for offset printing.

[0002]

2. Description of the Related Art In offset printing, dampening water is used to separate a portion where printing ink is applied (image area) and a portion where it is not applied (non-image area). If the temperature or flow rate of this dampening water fluctuates, the passage of dampening water between the nip will deteriorate, the water film thickness on the plate surface will not be constant, and the appropriate emulsified state cannot be maintained. Is extremely important. The dampening water circulation device stably supplies the planned dampening water of each component concentration to the water tank of the printing unit at a constant flow rate and at a constant temperature, and collects the dampening water that has passed through the water tank. Water is passed through a filtration device having multiple types of filters to be regenerated into fresh dampening water and supplied to the water boat.

FIG. 3 is an explanatory view showing a connected state of a conventional filtering device. A filtering device 74 in which different types of cylindrical filters 72 and 73 are housed in housings 70 and 71,
75 are arranged and connected in two stages. By manually opening the ball valves 76, 82, the filtering device 7
Water can be passed to 4,75. Damping water is pipe 79
Of the pump 77, flows into the filtration device 74 to be filtered, flows into the filtration device 75 through the pipe 81, is filtered, and flows out through the pipe 83.

When the value of the pressure sensor 78 provided in the pipe 79 on the upstream side of the filtering device 74 becomes larger than a predetermined value, it is considered that the filters 72 and 73 have reached the end of their service lives and are replaced. When replacing, first, the pump 77 is stopped, the ball valves 76 and 82 are closed, and the drain valves 80 and 84 are
Open to discharge the dampening water accumulated in the housings 70, 71. After discharging, the housings 70 and 71 are opened and the filters 72 and 73 are taken out and replaced. After the replacement, close the drain valves 80, 84 to close the ball valves 76, 82.
Open and start passing water.

At this time, since air is likely to stay in the housings 70 and 71, the air vent valves 85 and 86 are opened to expel the air. Further, during operation, fine air bubbles contained in the dampening water accumulate in the housings 70, 71, so the air vent valves 85, 86 are opened at predetermined intervals to expel air. The operation of these valves is all done manually.

[0006]

However, in the above-mentioned conventional filter device, the dampening water is discharged by opening the drain valves 80 and 84, but the dampening water contained in the filters 72 and 73 is Since it is separated from the filter and discharged by its own weight, it takes a long time to complete the discharge and the replacement time of the filter becomes long.

Further, since the valves are all opened and closed manually, it takes time, malfunctions occur, and the filtration efficiency decreases. Therefore, the problem to be solved by the present invention is to shorten the time required for filter replacement,
It is to provide a filter filtration device that can be operated efficiently.

[0008]

In order to solve the above-mentioned problems, in the filter filtration device of the present invention, a filter for removing foreign matters in the dampening water used for offset printing is replaceably provided, and A filter filtering device for flowing out from an outflow side pipe through a filter in a housing, wherein the inflow side pipe line is provided with a switching valve for supplying either dampening water or air for removing dampening water. Is.

Before replacing the filter, it is necessary to surely remove the dampening water remaining in the housing. The water is removed to prevent water from flowing out when the housing is opened and to reduce the weight of the filter to be replaced. Since air is supplied when the filter is replaced, a pump that can supply either gas or fluid (self-priming type) is used. Or, for example, a compressor is used as an air source for supplying compressed air,
0.005 to 0.0 at a pressure of about 3 to 5 kg / cm ^2.
Air is supplied at a flow rate of 1 m ³ / s.

When the switching valve is switched to the air source side, compressed air is sent into the filter arranged in the housing, and the dampening water held in the filter is pushed out of the filter by the air. With this configuration,
The dampening water can be quickly removed from the filter without waiting for dropping due to its own weight, and the filter can be replaced quickly.

It is also possible to connect both ends of a discharge pipe for extracting the air staying in the housing, to the upper portion of the housing and the outflow side conduit, respectively. The exhaust pipe is provided with a valve that can be opened and closed, and by opening this valve, the air accumulated in the housing is exhausted.
Since the discharge pipe is connected to the outflow side pipe, the dampening water is prevented from being discharged from the housing together with the air, and the dampening water that has flowed out is returned to the outflow side pipe.

Further, it is possible to connect to the discharge pipe a timer device which automatically opens an opening / closing valve for discharging the air staying in the housing in an opened state at predetermined intervals for a predetermined time. The fine air bubbles that circulate with the dampening water are captured by the filter and stay in the housing,
It becomes an air mass. If this air mass is left as it is, the filtration efficiency will deteriorate, so it is necessary to remove it every predetermined time. Since a timer device is connected, work can be performed reliably every predetermined time, quality deterioration due to forgetting work can be prevented, and since it opens only for a certain period of time, set this time according to the amount of air lumps. Thus, the air lump can be reliably removed.

Further, when the timer device is in the ON state, the control by the timer device is released to hold the open / close valve in the open state, and in the OFF state, the timer device is forced to restart the control of the open / close valve. It is also possible to provide a switch. Immediately after the filter is replaced, air is likely to be accumulated in the filter, and the time for removing this air is longer than the normal time for removing air lumps. Therefore, when the force switch is turned on, the open / close valve is fixed in the open state until the force switch is pressed again, so that air can be reliably removed. In this case, the state of air removal can be easily visually checked by the sight glass provided on the most downstream side.

Further, a pressure sensor for measuring the pressure of dampening water is provided in the inflow side pipe line, and an alarm is issued to the pressure sensor when the measured pressure exceeds a set pressure to replace the filter. It is also possible to provide an alarm device for informing. The alarm can be given by, for example, light, sound or the like. Since the pressure sensor is provided, the life of the filter is judged depending on the clogging state of the filter, and the alarm device is provided so that the replacement time of the filter is surely notified.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 is an explanatory view of a filter filtration device of the present invention, and FIG. 2 is an explanatory view of a display panel of a control device of the filter filtration device.

The filter filtration device 1 is a filtration device 12, in which cylindrical filters 8, 9, 10 for removing foreign matters in dampening water used for offset printing are replaceably provided in housings 5, 6, 7. Dampening water is introduced into the respective filtering devices 12, 13, 14 from the inflow side pipelines 2, 3, 4 and flows out from the outflow side pipeline 11 via the filters 8, 9, 10. Device.

The filter 8 removes rough foreign matter having a diameter of, for example, about 1 to 5 μm. The filter 9 has a positive potential and removes foreign matters having a small diameter such as colloidal particles having negative ions. The filter 10 is made of activated carbon and removes pigments and odors in water. In addition, a water activation device 15 is provided in the outflow side pipe line 11 to prevent scale.
Slime control, red water prevention, etc. are performed, and a flow meter 46 with a visual window is also provided.

A pump 16 for passing dampening water is provided in the inflow pipe line 2 on the most upstream side, and a switching valve 18 is provided on the upstream side of the pump 16. Switching valve 18
A pipe 19 that is open to the atmosphere or that is connected to the air source 17 and a pipe 19a that allows circulating dampening water to pass therethrough are connected to.

The inflow side conduit 3 connects the outflow port of the filtering device 12 and the inflow port of the filtering device 13, and the inflow side conduit 4 connects the outflow port of the filtering device 13 and the inflow port of the filtering device 14. ing. Each of the filtering devices 12 to 14 includes a filter 8
Pressure sensors 20 to 22 are provided to measure the pressure difference between the upstream side and the downstream side.

One ends of the discharge pipes 23 to 25 are attached to the upper ends of the housings 5 to 7 of the filtration devices 12 to 14, respectively, and the other ends of the discharge pipes 23 to 25 are attached to the outflow side pipe line 11. ing. The discharge pipes 23 to 25 are provided with open / close valves 26 to 28, respectively. By opening the opening / closing valves 26 to 28, the air staying in the housings 5 to 7 can be extracted from the exhaust pipes 23 to 25.

Switching valve 18 and open / close valves 26-28
Are connected to the control device 33. The control device 33 is provided with a timer device 30 having a compulsory switch 29 (see FIG. 2) and controls the operation of the opening / closing valves 26 to 28. Further, the control device 33 includes an air feeding device 31 for controlling the operation of the switching valve 18 and pressure sensors 20 to 2.
An alarm generating device 32 is provided which is connected to 2 and operates in conjunction with the value.

The timer device 30 includes open / close valves 26 to 28.
Can be automatically opened for a fixed time T2 every predetermined time T1. The predetermined time T1 and the fixed time T2 can be set in advance. When the predetermined time T1 is set to be long, the amount of air accumulated increases, so that the fixed time T2 required for bleeding air also becomes long, but the operation frequency of the open / close valves 26 to 28 can be reduced to prevent an operation error. it can. Further, if the predetermined time T1 is set to be short, the fixed time T2 is also shortened and the operation frequency is increased, but since the state in which there is almost no air in the housing can be maintained, the filters 8 to 10 can be used efficiently.

The compulsory switch 29 is turned on each time it is pressed,
It can be switched off. When the forced switch 29 is turned on, the control by the timer device 30 is released and the open / close valves 26 to 28 are held in the open state. The time for removing the air is set to be longer than the fixed time T2, and the filter 8 to
10 It is possible to deal with special situations such as immediately after replacement.
In the OFF state, control by the timer device 30 is restarted.

The alarm generator 32 includes pressure sensors 20-2.
When the pressure of the dampening water measured in 2 exceeds the preset pressure set in the control device 33, an alarm is issued to notify the time of replacement of the filter.

The air feeding device 31 is connected to the switching valve 18, and the switching valve 18 is switched to filter 8 to 1.
A predetermined amount of compressed air is fed into 0. This predetermined amount is
It can be set in the control device 33 in advance according to the sizes of the filters 8 to 10.

As shown in FIG. 2, a display panel 34 of the control device 33 is provided with various visual lamps and display portions of measuring instruments. On the upper stage of the display panel 34, an operation switch 35 with a lamp, a power supply lamp 36, a warning lamp 37, and a filter replacement switch 3 with a lamp are arranged in order from the left.
8. A reset switch 39 for canceling the alarm and a compulsory switch 29 are arranged. In the center of the display panel 34,
A buzzer device 40 with a built-in speaker is arranged, and in the lower stage, a main power switch 41 and a pressure sensor 20-
22, the display unit 42, the switching valve 18 of the air feeding device 31
The setting display section 43 for setting and displaying the switching time of the above, and the setting display section 44 for setting and displaying the predetermined time T1 and the constant time T2 of the timer device 30 are arranged.

Next, a procedure for using the filter filtration device 1 will be described. (During Normal Operation) During normal operation, first, when the main power switch 41 is turned on, the power lamp 36 and the pressure sensor 20 are turned on.
The display units 42 to 22 light up. Next, switching valve 1
It is set so that the dampening water side of 8 is opened and the opening / closing valves 26 to 28 are closed. Next, turn on the operation switch 35.
Then, the pump 16 is started, and the dampening water circulation starts. The dampening water passes through the inflow-side pipe line 2, the filtering device 12, the inflow-side pipe line 3, the filtering device 13, the inflow-side pipe line 4, the filtering device 14, and the outflow-side pipe line 11 in order to remove foreign matters. .

(When replacing the filter) From the normal operation state,
When the pressure of the pressure sensors 20 to 22 rises and becomes higher than the set pressure, the warning lamp 37 is turned on and the buzzer device 40 is activated.
Sounds and the pump 16 stops. The operator pushes the reset switch 39 to stop the buzzer device 40. Next, the display unit 42 identifies the filter 8 to 10 that needs to be replaced, confirms the stock, and then presses the filter replacement switch 38. Then, the switching valve 18 is connected to the air side pipe 19 side by the air feeding device 31, and the dampening water in the filters 8 to 10 in each of the filtering devices 12 to 14 is pushed out by the compressed air. After that, the air feeding device 31
Thus, the switching valve 18 is switched to the dampening water side pipe 19a side, and the outflow side valve 45 provided in the outflow side pipe line 11 is closed to prevent backflow.

Then, the main power switch 41 is turned off, a predetermined one of the filters 8 to 10 is replaced, and after the replacement, the main power switch 41 is turned on again. Next, the outflow side valve 45 is opened and the pump 16 is operated.

When the compulsory switch 29 is pressed, the open / close valves 26 to 28 are opened. The dampening water flows into each of the filtering devices 12 to 14, and the air therein is pushed out. Further, since the air that tends to stay is pushed out also from the discharge pipes 23 to 25, the inside of the filtering devices 12 to 14 is quickly filled with dampening water. After observing the inside from a flow meter 46 (site glass) with a visual window and confirming the removal of air, the forced switch 29 is pressed again to close the opening / closing valves 26 to 28.
In this way, normal operation can be restored.

(At the time of bleeding air) When the predetermined time T1 set on the setting display section 44 has elapsed from the start of the operation of the apparatus, the open / close valves 26 to 28 are automatically opened. Then, the air accumulated in the filtering devices 12 to 14 is discharged from the discharge pipes 23 to 25. The on-off valves 26 to 28 have a predetermined time T2.
It will be closed automatically after the passage. The discharge pipes 23 to 25
Is connected to the outflow side pipe line 11, and since the drain valve is not provided in the outflow side pipe line 11, the dampening water will not flow out of the system at the time of air removal or filter replacement. Absent.

[0032]

The present invention has the following effects. (1) Since a switching valve for supplying either the dampening water or the air to the filtering device is provided in the inflow side pipe line,
The dampening water in the filtering device can be quickly removed from the filter without waiting for the dropping of the dampening water due to its own weight, the filter can be replaced quickly, and the device can be operated efficiently by shortening the operation interruption time.

(2) In the upper part of the housing and the outlet side pipe line,
By connecting both ends of the discharge pipe respectively, it is possible to prevent dampening water from being discharged together with air from the inside of the housing.
Since the dampening water that has flowed out is returned to the outflow side pipeline, there is no outflow of dampening water.

(3) By connecting a timer device that automatically opens and closes the open / close valve for a fixed period of time, the air accumulated in the filtration device can be automatically removed, and the entire surface area of the filter is immersed in the fluid. This makes it possible to secure the maximum filtration area, prevent deterioration of quality due to forgetting work, and stabilize the quality of dampening water with a constant working time.

(4) If the timer device is provided with a compulsory switch for holding the open / close valve in the open state in the ON state, the compulsory switch is pushed again when a large amount of air needs to be removed immediately after the filter is replaced. Since the open / close valve is fixed in the open state, the air can be reliably removed.

(5) Since the filter is provided with the pressure sensor, the life of the filter can be judged by the clogging state of the filter, the waste of the filter can be prevented, and the members can be saved.

(6) Since the switching valve is provided with an air supply passage or an air supply device is connected to supply a predetermined amount of compressed air to the filter, operating costs and time due to wasteful air are reduced. Waste can be eliminated, the time required for filter replacement can be shortened, and the device can be operated efficiently.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a filter filtration device of the present invention.

FIG. 2 is an explanatory diagram of a display panel of a control device of the filter filtration device.

FIG. 3 is an explanatory diagram showing a connected state of a conventional filtering device.

[Explanation of symbols]

1 Filter filtration device 2-4 Inflow side pipeline 5-7 housing 8-10 filters 11 Outflow side pipeline 12-14 Filtering device 15 Live water device 16 pumps 17 Air source 18 Switching valve 19, 19a piping 20-22 Pressure sensor 23-25 discharge pipe 26-28 open / close valve 29 Forced switch 30 timer device 31 Air feeding device 32 alarm generator 33 Control device 34 Display panel 35 Operation switch 36 Power lamp 37 Warning lamp 38 Filter exchange switch 39 Reset switch 40 buzzer device 41 Main power switch 42 Display 43,44 Setting display 45 Outflow side valve 46 Flow meter with viewing window

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B41F 33/14 B41F 33/14 Z

Claims (5)

[Claims] 1. A filter filtration device for use in offset printing, wherein a filter for removing foreign matter in dampening water is replaceably provided, and flows out from an inflow-side conduit via a filter in a housing to an outflow-side conduit. A filter device, characterized in that a switching valve for supplying either dampening water or air for removing dampening water is provided in the inflow side pipe line. 2. An exhaust pipe for extracting air staying in the housing is connected to the upper portion of the housing and the outflow side pipe, respectively.
The filter filtration device described. 3. The discharge pipe is connected with a timer device that automatically opens an opening / closing valve that discharges air accumulated in the housing in an open state at predetermined intervals for a predetermined time. The filter filtration device described. 4. The timer device is provided with a compulsory switch for releasing the control by the timer device to keep the on-off valve in the open state when the timer device is in an ON state and restarting the control by the timer device when the valve is in an OFF state. The filter filtration device according to claim 3, wherein 5. A pressure sensor for measuring the pressure of dampening water is provided in the inflow side pipe line, and an alarm is issued to the pressure sensor when the measured pressure exceeds a set pressure to replace the filter. The filter device according to any one of claims 1 to 4, further comprising an alarm device for notifying the user.