JPH028075B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a papermaking screen used in the papermaking industry for selecting and washing paper stock. More specifically, the present invention relates to a papermaking screen that has been improved so that water is blown up by the movement of the screen frame, thereby transporting paper stock and foreign matter.

BACKGROUND TECHNOLOGY Conventionally, as a paper manufacturing screen, the one shown in FIG. 11 is known. The shaking means 11 shakes the material to be processed, which is supplied to one end of the screen plate 12, so that paper stock and contaminants are sieved by the vertical vibrations of the screen plate 12, and the back-and-forth vibrations The paper stock and foreign matter are sent to the other end of the screen plate 12 for continuous processing.

Problems to be Solved by the Invention In the conventional papermaking screen described above, the object is fed by the vibration in the front and back direction when the screen frame 10 is shaken, so in order to exhibit the desired feeding ability, it is necessary to Shaking means 11 for the screen frame 10
The rotation speed is set to 700R・P・M or more,
Such high-speed operation generates vibrations that can be transmitted over long distances along the ground, making it difficult for nearby residents to sleep, and creating problems that make it impossible to install such systems in factories located in residential areas. Ta.

Means for Solving the Problems In order to eliminate the above problems, in the papermaking screen of the present invention, a screen plate having holes is provided at the bottom of the screen frame, and the vertical movement of the screen frame allows water to flow upward. In order to cause the air to blow up, a plurality of guide members are erected under the screen plate to form the side walls of a large number of small compartments, and the holes in the screen plate are formed so as to face the small compartments.

Function The papermaking screen configured as described above is
The shaking means 4 of the screen frame 2 is rotated at a speed of about 350R・P・M, and the screen frame 2 supported so as to be swingable is shaken at this speed, and the vertical vibrations cause the paper stock and foreign matter to be removed. In addition to sieving, the vertical movement of the screen frame 2 raises and lowers the small compartments 7 provided below the screen plate 6 in the water, and each small compartment 7 functions as a water iron plane. When the screen frame 2 is lowered, water is blown up from each compartment 7 through the holes 6a of the screen plate 6, and when the object to be sent is being lifted up, the screen frame 2 is moved back due to back and forth vibration.
If the descending object is received and moved forward, even if the rotational speed of the shaking means 4 of the screen frame 2 is slow as described above, the object will be reliably fed and moved out of the screen plate 6. Furthermore, rotation at this speed does not generate vibrations that are transmitted far.

Embodiment An example of the implementation of a paper manufacturing screen according to the present invention will be described below with reference to the drawings.

In FIG. 1 of the drawings, 1 is a tank in which white water or water is stored.

Reference numeral 2 denotes a screen frame, which is suspended and swingably supported by an elastic member 3 such as a spring into the tank 1 so that it can be freely swung up and down, and back and forth. The screen frame 2 is shaken by a shaking means 4, and the side surfaces of the screen frame 2 are either flat on the paper inlet side and upwardly sloped on the outlet side, as shown in FIG. As shown in Figure 3, the entire paper stock may be inclined so that the outlet side is higher than the inlet side, or as shown in Figure 4, the entire surface is flat and a discharge groove 5 is provided on the rear side. It has been formed.

Reference numeral 6 denotes a screen plate, which is stretched within the screen frame 2 to sieve the paper stock.This screen plate 6 leaves the paper stock on the screen plate 6 and removes ink, clay, ash, etc. In the case of washing paper stock by passing it through the screen plate 6, use a wire mesh or synthetic resin mesh as shown in Fig. 5, leave the waste on the screen plate 6, and wash the paper stock through the screen plate 6. In the case of sorting, a perforated plate shown in FIG. 6 or a slit plate shown in FIG. 7 is used. The screen plate 6 is located on the bottom surface of the screen frame 2 and has a hole 6a, and the hole 6a of the screen plate 6 is formed so as to face a small compartment 7, which will be described later.

Reference numeral 7 denotes a large number of small compartments provided below the screen plate 6, and a plurality of guide members 7a are erected to form the side walls of the large number of small compartments 7, as shown in FIGS. 8 and 9. It is formed by joining a large number of round, square, triangular, rhombic, polygonal, etc. pipes a at their mutual contact parts, or by combining plates b shown in Fig. 10 by means such as phase cutouts. , these small compartments 7 are caused by the vertical vibration accompanying the shaking of the screen frame 2. When the screen frame 2 is shaken, the water therein is pulled downwards, and when it is descending, it is pushed upwards, causing the water iron to be blown upwards into the screen plate 6. Since it performs the action of a plane, it is better to have as small a cross-sectional area as possible, but the smaller the screen plate, the more difficult and expensive it is to manufacture. It shall be set taking into consideration the sheath stock density and other conditions.

The papermaking screen shown in the above embodiment for selecting and washing paper stocks has a large number of small compartments 7 formed on the lower side of the screen plate 6 that function like water iron planes when moved up and down. Even if the shaking means 4 was rotated at a low speed that does not cause harmful vibrations, the object could be reliably sent at the required speed by blowing up water and moving the screen frame 2 back and forth. That is, although the liquid level fluctuates as the screen frame 2 moves up and down, the force acting on the small compartment 7 is divided by the subdivided small compartments 7, so there is no imbalance in the forces acting on the small compartment 7. This prevents water from being blown up from the holes 6a of the screen plate 6, and as a result, the object on the screen plate 6 can be easily sent, and the screen frame 2 can be moved as in the conventional case. It has the effect of reducing vibration and noise since there is no need for vigorous rocking.

Effects of the Invention The paper manufacturing screen according to the present invention is provided with a screen plate having holes on the bottom surface of the screen frame, and furthermore, a guide member is placed under the screen plate in order to cause water to be blown upward by vertical movement of the screen frame. Since the holes in the screen plate face the small compartments, the liquid level fluctuates as the screen frame moves up and down, but it does not affect the small compartments. Since the force is divided by the subdivided small compartments, an imbalance in the forces acting on the small compartments is prevented from being promoted, and water is more reliably blown up through the holes in the screen plate. As a result, the object on the screen plate can be easily moved, and there is no need to violently swing the screen frame as in the conventional case, which has the effect of reducing vibration and noise.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional side view showing an example of an embodiment of a papermaking screen according to the present invention. FIGS. 2 to 4 are longitudinal sectional side views showing examples of screen frames in the same as above. FIGS. 5 to 7 are partial plan views showing each example of the screen plate in the same as above. FIGS. 8 to 10 are partial plan views showing examples of small compartments.
FIG. 11 is a longitudinal sectional side view showing a conventional papermaking screen. In the figure, 1 is a tank, 2 is a screen frame, 3 is an elastic member, 4 is a shaking means, and 7 is a small compartment.

Claims (1)

[Claims] 1. In a papermaking screen in which paper stocks are selected and washed using a screen frame that is suspended in a tank by an elastic member and is swingably supported, a screen plate having holes is provided on the bottom surface of the screen frame, and further In order to cause upward water to blow up due to the vertical movement of the screen frame, a plurality of guide members are erected under the screen plate to form the side walls of a large number of small compartments, and the holes in the screen plate are connected to the A paper manufacturing screen characterized by being formed so as to face a small compartment.