JPH05186993A - Device for discharging refuse of flat screen in paper machine having device for quantifying cleaning water - Google Patents

Abstract

PURPOSE:To automatically discharge separated refuse of flat screen used for paper machine by water sprinkling method, to clean the face of screen plate, to always make an amount of water spray constant and to prevent pulsative change of concentration of paper making stock. CONSTITUTION:A refuse discharging device consists of an air type continuous cable cylinder and a cleaning shower traveling and moving on a slide bar by a dispatch of contactless switches at both ends of the cylinder, the cleaning shower sprinkles water only during moving in the discharge direction of refuse and a defoaming shower on a flow box of a screen inlet part sprinkles water during returning or a waiting action. Both the showers sprinkle a fixed amount of water by a constant delivery valve and changing action of both the showers is linked to moving action of the cleaning shower.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to the separation of lees on a flat screen screen plate, which is installed just before the process of a paper machine in the paper manufacturing industry for the purpose of carefully selecting the stock flowing into the paper machine. TECHNICAL FIELD The present invention relates to a technique for discharging lees that are automatically discharged while washing the screen plate surface, and a technique for preventing the fluctuation of the stock material concentration by keeping the amount of washing water constant.

[0002]

2. Description of the Related Art Conventionally, in a flat screen immediately before the process of a paper machine, in order to avoid a change in the concentration of stock due to the use of washing water, the separating meal on the screen plate is manually scooped by a shovel. It is the current situation.

[0003]

In the above-mentioned conventional method for scooping the separated meal, not only the workability is poor due to the manual work, but also this work pushes the meal into the slit of the screen plate and causes the clogging of the slit. There was a problem that became. According to the present invention, while washing the screen plate surface with a fountain shower, the separating meal on the screen plate is automatically discharged, and at the same time, the shower jetting operation is automatically programmed, and the amount of fountain poured on the screen is fixed. It is an object of the present invention to provide a device that prevents fluctuations in stock density as a quantity.

[0004]

In order to achieve the above object, the lees discharge device of the present invention separates the screen plate surface by a fountain from a washing shower pipe that reciprocates along the screen plate surface of a flat screen. The lees are automatically discharged to the outside of the machine from the lees discharge port opened in the frame of the screen body. The fountain from the washing shower pipe is fountain only while moving in the dreg discharge direction, and the dregs are recalled or pushed into the slit during the returning operation, so the fountain is stopped. In addition, it is necessary to perform the drainage operation by the washing shower according to the state of the separated meal accumulated on the screen plate, and excessive washing involves discharging high-quality fibers. To stop. Furthermore, the angle of the fountain with respect to the screen plate should be such that the lees are not pushed into the screen plate and that the angle is suitable for draining the lees. In the reciprocating motion of the washing shower, the surroundings of the screen are always in a moist atmosphere due to working conditions and shower water splashes.When cleaning the inside of the screen, the frame of the screen body is opened and closed, but the mechanical parts are removed during the work. In order to avoid such troubles, the mechanical mechanism such as an electric motor or a chain is avoided, and the present invention does so by a long cable cylinder that is pneumatically operated. In addition, a wash water meter will be installed. This is because the fountain from the washing shower pipe is intermittent as described above, so that the density of the stock material changes in a pulsating manner, resulting in a variation in the basis weight of the papermaking paper. Therefore, in the present invention, a foam defoaming shower is provided on the screen inflow side flow box to eliminate the foam generated on the upper surface of the stock material that causes papermaking troubles, and the fountain shower from the foam defoaming shower stops when the washing shower pipe is stopped. Let
Then, the ejection amount per unit time of both showers is made the same and constant. The above-mentioned lees discharge device and wash water metering device both work automatically in cooperation to save labor.

[0005]

[Operation] While the cleaning shower pipe sprays water on the slide bar along the screen plate surface from the standby side toward the lees discharge port, it moves to wash the plate surface and sends the lees to the lees discharge port to receive the lees. Discharge from the gutter to the outside of the machine. During the return operation and during standby, the fountain of the washing shower pipe stops, and the defoaming shower on the upper part of the flow box on the screen inflow side does the fountain instead. Further, the reciprocating speed of the washing shower pipe is adjusted by a speed controller on the supply line of the air serving as the operation source, and further, the reciprocating operation is stopped during standby, and this waiting time is arbitrarily set by a timer. Switching back and forth between the movements of the washing shower pipe
Proximity switches provided at both ends of the cable cylinder,
This is done by changing the open / close position of supply and discharge by an air valve on an air pipe connected to the cable cylinder in response to a signal that the support for moving the washing shower pipe is in proximity. In addition, the switching signal of the water supply pipe operates by the same signal, and the fountains of the washing shower pipe and the defoaming shower are switched, and a fixed amount of each fountain is constantly ejected per unit time. The operation of the reciprocating cable cylinder of the washing shower pipe and the operation of the jet switching valve with the bubble-eliminating shower are all automatically performed in sequence by the sequencer in the control panel.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The lees discharger according to the present invention as shown in FIGS. 1 to 4 has a long cable cylinder (2) which is pneumatically actuated and is attached to the upper outer surface of a (flat) screen body frame (1). Wash shower pipe (3) on its cable (a)
The moving support base (4) is fixed [see Fig. 2], and the moving support base (4) is placed on the slide bar (6) fixed to the screen body frame (1) by the bracket (5). (7), (8), (9)
It is provided through [see FIG. 4]. The end of the washing shower pipe (3) facing away from this transfer support (4) is the roller (9).
Place it on the slide bar (6 ') in a free state to support [see Fig. 3]. The washing shower pipe (3) has a fan-shaped nozzle (12) that serves as a washing shower, and the screen plate (11).
It is suitable for discharging the dregs against the surface, and sprays the dregs at an angle that does not push it into the slit (10) of the screen plate (11), and discharges the dregs (b) at one end of the screen body frame (1). )
The dregs are discharged to the slag, and the spilled dregs are received by the dregs receiving gutter (13) and discharged out of the machine through the discharge pipe (14) [see FIG. 1]. The connection between the washing shower pipe (3) and the water supply pipe is a rotary joint.
A flexible hose (16) is connected via (15) to facilitate the reciprocating motion of the washing shower pipe (3) [see FIG. 3]. Cable cylinder (2) Proximity switch (1
7) and (18) are provided, the signal for reciprocating movement of the cable cylinder (2) is issued in the vicinity of the moving support (4), and the operating air valves (19) and (20) of the cable cylinder (2) are issued. Switch between open and close. (25) and (25 ') are speed controllers [Fig. 2
reference]. Further, as shown in FIG. 1 above, a foam elimination shower (21) serving as a foam elimination spray shower is provided above the flow box (B) on the stock material inflow side (A). And as shown in FIG.
When opening and closing the screen body frame (1) during screen cleaning, use a fulcrum on the connection side of the water supply pipe, air pipe, and electric wire.
(c) is provided. Next, in the washing water metering device of FIG. 5, a metering valve (22) and a three-way automatic switching valve (23) are provided on the water supply pipe (d) path, and the three-way automatic switching valve (23) and subsequent ones are respectively washed in the shower. Connect to pipe (3) and foam shower pipe (21 ') of foam shower (21). Three-way automatic switching valve (23)
The switching operation is performed by the signals of the proximity switches (17) and (18) described above. The control panel (24) has a sequencer, a timer,
Provide an electromagnetic switching valve for the operation air pipe system. According to the present invention, the cleaning shower pipe (3) thus moves from the standby position (T) side to the lees discharge port (b) along the screen plate (11) surface on the slide bars (6) and (6 '). While fountain towards
While moving to clean the screen plate (11) surface, the dregs are sent to the dreg discharge port (b) and discharged from the dregs receiving gutter (13) to the outside of the machine.

[0007]

EFFECTS OF THE INVENTION The separation waste of the screen is mechanically operated by hand so that labor can be saved.
The dregs discharging method does not push the dregs into the slits of the screen plate due to the water spray, and the screen plate surface can always be automatically cleaned. In addition, the moving mechanism of the washing shower pipe does not rely on a mechanical mechanism such as an electric motor or a chain, but rather a mechanism based on a pneumatically actuated cable cylinder, so it is not affected by the moist atmosphere around the equipment, which is important for maintenance. It is advantageous. In addition, a washing water metering device was installed, and a bubble elimination shower was installed on the flow box on the screen inflow side to eliminate the bubbles generated on the upper surface of the paper stock, which causes papermaking troubles. The amount of water injected into the stock supplied to the paper machine is
Since the amount is always constant, the stock concentration can be kept constant.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the main part of the device of the present invention.

FIG. 2 is an explanatory view seen from the right side of FIG.

FIG. 3 is a vertical sectional view of a screen body frame.

FIG. 4 is a cross-sectional view of a moving support base.

FIG. 5 is a view showing a cleaning water quantification device of the present invention.

[Explanation of symbols]

 (1) Screen frame (2) Cable cylinder (3) Washing shower pipe (4) Moving support (5) Bracket (6) Slide bar (6 ') Slide bar (7) Roller (8) Roller (9) Roller (10) Slit (11) Screen plate (12) Fan-shaped nozzle (13) Lean gutter (14) Discharge pipe (15) Rotary joint (16) Flexible hose (17) Proximity switch (18) Proximity switch (19) Air Valve (20) Air valve (21) Bubble shower (21 ') Bubble shower pipe (22) Metering valve (23) Three-way automatic switching valve (24) Control panel (25) Speed controller (25') Speed controller (A ) Paper material inflow side (B) Flow box (T) Standby position (a) Cable (b) Waste port (c) Support point (d) Water supply pipe

Claims (1)

[Claims] 1. A washing water metering device in which a washing shower pipe and a defoaming shower are switched to each other and a constant amount of water is injected into a flat screen by a metering valve is provided. A flat screen lees discharge device in a paper machine having a washing water quantitative device characterized by automatically discharging separated lees while washing the screen plate with a fountain from a shower pipe.