JPS6332920B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to equipment used in the paper and pulp industry to screen raw materials for papermaking.

Conventional paper stock sorting machines have an inlet for the suspension of paper stock etc. in the center and a discharge port for foreign matter on the outer periphery.
A device that effectively generates forced vortex flow and centrifugal force in the primary chamber by making the primary chamber into a thin circular shape with a fine-mesh screen separating it from the secondary chamber and installing an impeller that rotates at high speed inside the primary chamber is as follows. This type of device is known from Japanese Patent Application Laid-Open No. 53-81708, which was filed by the present inventor, and there is a part for separating foreign matter from the paper stock on the front side of the impeller in the primary chamber. When paper stock is fed through the central feeding port, the paper stock is swirled by the rotation of the impeller, and the resulting centrifugal force removes paper stock lumps and foreign matter that have a higher specific gravity than the paper stock. The screen plate, which is automatically washed by the action of the vortex generated by the rotation of the impeller, is separated from the secondary chamber. Because it is passed through by pressure,
Screening can be carried out efficiently without interference from foreign objects, and there is no possibility that minute foreign objects will pass through the screen plate and get mixed into the selected stock, or that large foreign objects can get caught between the screen plate and the impeller and cause the screen to fail. Because the plates were not damaged, high-capacity paper stock selection was performed with low power and no breakdowns, and high-quality paper stock was obtained at a good yield. Since a cleaning member for the screen surface was not provided, paper residue may adhere to the back of the screen plate, or the paper stock may become tangled, which may separate and mix into the selected paper stock, resulting in stains on the paper. This has the drawback of causing paper breakage and paper breakage, which has been a major problem when long fibers, asbestos, or synthetic fibers are used as paper stock.

In contrast, the present invention arranges a thin circular primary chamber and a secondary chamber with a screen plate in between, and passes a rotating shaft through the center of these primary chambers and secondary chambers from the secondary chamber side. The screen plate is held between the shafts, and the primary and secondary impellers are installed correspondingly in the primary and secondary chambers. A foreign matter discharge port is provided in the secondary chamber, and a selected paper delivery port is provided in an appropriate location in the secondary chamber, so the above-mentioned JP-A-53-
Not only does it have the same effects as No. 81708, but
An impeller placed close to the screen plate rotates in the secondary chamber, creating a vortex on the screen plate surface, and this action causes paper waste to adhere to the back of the screen plate and paper waste to clean the screen surface without interruption. The selected paper stock discharged from the discharge port of the secondary chamber is Since it is uniformly dispersed and does not cause stains or paper breaks in paper making, it has the effect of making it possible to obtain high-quality products without problems even when long fibers, asbestos, or synthetic fibers are used as paper stock.

Next, an embodiment of the paper stock sorting machine according to the present invention will be described below with reference to the drawings.

In the figure, 1 and 2 are thin circular primary and secondary chambers, and a screen plate 3 with 0.1 to 0.15 mm slits (holes similar to these are also acceptable) is placed between them, and the outer peripheral side of the primary chamber is A foreign matter discharge port 4 is provided tangentially to. Reference numeral 5 denotes an impeller installed in the primary chamber 1 by being attached to a shaft 6 passing through the secondary chamber 2, and is positioned so as to approach the screen plate 3 and to be separated from the front wall on the opposite side from the screen plate 3. A blade 7 is provided on the screen plate 3 side. Reference numeral 8 denotes an inlet for feeding paper stock into the primary chamber 1, which is provided at the center of the front wall corresponding to the center of the impeller 5. Reference numeral 9 denotes a foreign matter separation section provided on the front side of the impeller 5, which removes foreign matter from the paper stock and prevents foreign matter from reaching the screen plate 3. 10 is a motor for driving the impeller 5, and its shaft 11 is connected to the shaft 6 by a coupling 12. 13 is a vortex separator connected to the foreign matter discharge port 4 of the primary chamber 1 through a pipe 14;
5 is connected to the stock inlet 7 of the primary chamber 1 via piping 16, and the foreign matter discharge port 17 is opened downward, thereby causing the foreign matter sent from the discharge port 4 to swirl and flow, thereby removing the paper stock mixed with the foreign matter. The foreign substances are removed from the discharge port 17, and the stock is returned to the primary chamber 1 from the reflux port 15 for selection. 18 is attached to the shaft 6 with a phase of 90 degrees with the impeller 5,
An impeller provided in the secondary chamber 2 is brought close to the screen plate 3, and the back surface of the screen plate 3 is cleaned by rotating with a vortex. Reference numeral 19 denotes a selected paper stock delivery port provided on the outside of the back of the secondary chamber 2, through which the selected paper stock is delivered to the next process.

Since one embodiment of the paper stock sorting machine according to the present invention is constructed as described above, the impeller 5 in the primary chamber 1 is rotated by the motor 10, and the paper stock is transferred from the inlet port 8 into the primary chamber 1. When fed, the paper stock swirls around the foreign matter separating section 9 in the primary chamber 1 due to the vortex generated by the rotation of the impeller 5, and undisintegrated parts are disintegrated by mutual friction and friction with the wall of the primary chamber, and the paper stock is disintegrated. Due to the action of centrifugal force generated by the rotation, the heavy foreign matter that enters the space moves along the front wall from the center to the outer periphery, is concentrated in this area, and is removed from the discharge port 4 to the outside. Only paper stock from which foreign matter has been removed exists on the impeller side of 9, and as the subsequent paper stock is fed, it reaches the position of the screen plate 3, and due to the rotation of the impeller 5, it is divided into the primary chamber 1 and the secondary chamber 2. It is discharged into the secondary chamber 2 through the 0.1 to 0.15 mm slit in the screen plate 3 under the differential pressure of 0.3 to 0.6 kg/cm ² generated between the two. Screening is extremely efficient because there are no foreign substances intervening that would impede screening. Since it does not get caught in between, it is possible to easily select high-density paper stocks of 1.5 to 2.5% using minute slits of 0.1 to 0.15 mm.

In addition, in this paper stock sorting machine, an impeller 18 is also supported on a shaft 6 in the secondary chamber 2, and rotates in cooperation with the impeller 5 to generate a vortex on the back side of the screen plate 3 to clean the screen surface. Therefore, the paper residue does not adhere to the back surface of the screen plate 3, and the paper stock does not get tangled, and even if the paper stock gets tangled, the impeller 18 disintegrates it and prevents it from being sent. Uniformly disperses the paper stock sent out from the outlet 19,
Since it enables the production of uniform and defect-free paper, good results can also be obtained in paper production using long fibers, asbestos, and synthetic fibers as stock materials.

In this stock sorting machine, the foreign matter discharged from the foreign matter discharge port 4 in the primary chamber is sent to the vortex separator 13 as shown in Figure 2 of the drawing, and if it is swirled in this separator 13, the lower part of the foreign matter is removed. The paper stock that is removed to the discharge port 17 and mixed with foreign matter is collected in the center and returned to the primary chamber 1 through the circulation port 15 to be carefully selected and made into a product, which has a great effect on improving the paper stock yield. It is something that

[Brief explanation of the drawing]

The drawings show an embodiment of the paper stock sorting machine according to the present invention, and FIG. 1 is a partially longitudinal side view, and FIG. 2 is a longitudinal sectional front view of the primary chamber. In the figure, 1 is the primary chamber, 2 is the secondary chamber, 3 is the screen plate, 4 is the foreign matter outlet, 5 is the impeller, and 6
8 is a shaft, 8 is a stock inlet, 9 is a foreign matter separating section, and 18 is an impeller.

Claims (1)

[Claims] 1 Arrange a thin circular primary chamber and a secondary chamber with a screen plate in between, pass a rotating shaft through the center of these primary and secondary chambers from the secondary chamber side, and sandwich the screen plate on the rotating shaft. In the primary chamber and the secondary chamber, primary and secondary impellers are installed correspondingly, a stock inlet is provided in the center of the front wall of the primary chamber, and a foreign matter discharge port is provided tangentially to the peripheral wall, A paper stock sorting machine characterized by having an outlet for the selected paper stock at an appropriate location in a secondary chamber.