JPH077357Y2 - Agitator in papermaking screen - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is intended to effectively remove impurities from raw materials in a papermaking raw material adjustment line such as papermaking or used paper processing in a papermaking facility to recover useful fibers. The present invention relates to an agitator in a papermaking screen.

[Conventional technology]

Generally, in papermaking equipment such as papermaking and wastepaper processing, a screen basket configured with a screen plate is used to remove foreign substances such as stones, sand, metal pieces, resin pieces, etc. in the fiber suspension as a raw material. This screen is used as an internal pressure type screen that presses the raw material from the inside to the outside in the screen basket in the closed casing to increase the processing capacity or an external pressure type screen that flows the raw material in the opposite direction, and the selective treatment In order to enhance the capacity and the dust removal effect, it is known that an agitator having wings is rotatably arranged inside or outside the screen basket to enhance the screening effect. The upper and lower lengths are almost equal to each other and are almost parallel to the peripheral surface of the screen basket. Are deployed, pressurization by wings, variations in the pressure of the negative pressure is acting to prevent clogging of the screen th hole.

In a conventional agitator, a wing-shaped rotor in which a wing piece d is supported by a boss b inserted into a rotary shaft a through an arm c (Fig. 6A) or a closed drum f along the entire surface of a screen basket e is used. An agitator which is a closed drum type rotor (FIG. 6B) supporting the blade a on the outer periphery of the agitator is used.

[Problems to be solved by the invention]

However, in the agitator of the airfoil rotor, it is easy for the support arm to get tangled with dust such as threads and strings in the raw material, and once it is entangled, it will not come off easily. In addition to instability in operation, there were problems such as being caught in the screen basket during operation due to debris, being clogged with the screen basket, damaging the screen plate, and causing a clogging phenomenon. Therefore, if a sealed drum rotor is used to reduce the entanglement of dust, there is no space between the screen basket and the rotor, and if large dust or foreign matter enters, the dust will be caught and overloaded and overloaded. Not only will the screen plate be damaged, but the dust collecting zone will become smaller on the downstream side of the screen basket, which will reduce dust removal frequently, and the time that the reject valve can be operated in a short time will decrease. There was a defect that the production volume of the product also decreased.

The present invention is intended to eliminate these conventional problems, the cleaning process of the screen is simple, the dust and clogging phenomena are reduced, and the separation function of the screen is greatly improved to achieve efficient processing. It is an object of the present invention to provide an agitator in a screen that can be easily formed, stabilizes the operation, and can increase the production amount in a simple and inexpensive form.

[Means for solving problems]

The present invention is provided with a screen basket in which a drum is surrounded by a screen plate having a large number of slits or holes arranged at a predetermined pitch in a casing, and a rotor type agitator is rotatably provided around a rotary shaft along the screen basket. In a papermaking screen, a cylindrical body having a runner connected to the rotating shaft on its top surface, and a wing piece provided on the outer circumference of the cylindrical body and provided in an inclined state to recede in the rotational direction at an angle with the axis. And a drum rotor provided with a blade extending and protruding downward from the end edge of the cylindrical body is disposed in the vicinity of the downstream side of the screen basket.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 3. Slits or holes for separating a useful fiber component and a foreign matter component of impurities from a raw material into a casing 1 for supplying a fiber suspension of a papermaking raw material. In a screen in which a screen basket 2 is enclosed in a drum shape by a large number of screen plates arranged at a predetermined pitch, and an agitator 3 that rotates in close proximity to the outer peripheral side of the screen basket 2, a rotary shaft 4 of the agitator 3 is provided. A cylindrical body 6 is formed around a runner 5 having an insertion hole, and an agitator 3 is constituted by a drum rotor provided with blades 7 on the outer circumference of the cylindrical body. Finish halfway through basket 2,
And projecting the Tsubasahen 7 from tube body edge ₆₁ are then disposed close to the downstream side around the screen basket 2.

In this embodiment, the agitator 3 is an internal pressure type in which the raw material flows from the inside of the screen basket 2 toward the outside, and the agitator 3 rotates inside the screen basket 2, and the runner 5 is a vertical screen basket 2 a disk body which covers the upper end surface of the cylindrical body 6 having a runner 5 ₁ on the downstream side are deployed in the raw material inlet side, i.e. the tube body 6
Both end surfaces in Yes configured as an agitator 3 which is a sealed drum rotor with a runner 5,5 _1, provided with an inner periphery of the screen basket 2 rotatably, inside the screen basket on the upstream side and the downstream side Although it is divided into about 3: 5 to 5: 5, a hollow drum rotor provided with a runner 5 only on one end surface of the cylinder 6 on the raw material inflow side is opened on the downstream side (Fig. 4) if necessary. It may be one.

The wing pieces 7 may be one or a plurality of wing pieces that are inclined or curved in a direction retracted from the rotation direction and may be arranged at equal intervals. Further, it is taken into consideration that the length of the blade piece 7 protruding from the cylindrical body 6 is made as long as possible within the range allowable in terms of strength. Also it is contemplated that the outside of the screen basket 2 to place the ring-shaped rib as the reinforcing member 2 _1.

In this embodiment, as the casing 1, a raw material supply port 8 for tangentially supplying a fiber suspension into the casing, a foreign substance discharge port 9 for tangential discharge, and a useful fiber discharge port 10 for the stock after screening. The pressure screen has a closed vertical cylinder provided with and a screen basket 2 and an agitator 3 which are concentrically arranged. Further, the agitator 3 is fixed to the rotary shaft 4 via a runner 5 and is rotationally driven.

Reference numeral 11 in the figure is a lid, which is supported by the casing 1 by a holder 12 so as to be openable and closable. 13 is a drive pulley, 14 is a bearing, 15 is a base, and 16 is a motor.

In the specific example of FIG. 4, a cylindrical body 6 is provided below the runner 5 that covers the raw material inlet surface of the screen basket 2, and a plurality of rows of blades 7 are arranged on the outer periphery of the cylindrical body 6. The end shall consist of a rotor configuration with an open end,
This is an example in which operation is stabilized as a configuration that is lightweight and capable of light load operation.

In addition, on the outer surface of the runner 5, a linear protrusion or a concave groove,
It is also possible to use a curved projection or concave groove formed so as to generate a pumping action.

Figure 5 Examples The wings terminates at the cylindrical body edge ₆₁ of the cylinder 6 7
And an agitator 3 in which wing pieces 7 ₁ which are protruded from the cylinder end edge 6 ₁ and are hardly present outside the cylinder are arranged at intervals are provided on the inner circumference of the screen basket 2. You can also

[Action]

Then, the raw material supplied into the casing 1 through the raw material supply port 8 flows from the inside of the screen basket 2 toward the outside, and inside the screen basket 2, the agitator 3
Rotates, and the raw material is circulated and pressurized by the tubular body 6 and the blades 7 in the runner 5 to flow through to the outlet side while pressurizing the raw material to facilitate passage of useful fibers through the slits formed in the screen plate, For example, a long string is a rotor that is a blade with a tubular body on the upstream side, so it is difficult for trash to get entangled,
There is no cylinder on the downstream side, and even if trash is caught on the wing only with the winglet, it quickly slides and moves toward the tip, and it is easy to dislodge at the tip and flow to the reject side. The accumulation zone also becomes large and the reject valve is long,
It can be operated in the closed state and the production amount can be increased, and the vacuum force is also increased so that only useful fibers can be efficiently poured inward without clogging and discharged from the useful fiber outlet 10.
The operation can be performed with good processing efficiency, and the foreign matter contained in the raw material is blocked by the slit, pushed and removed on the reject outlet side, and discharged from the foreign matter discharge port 9.

[Effect of device]

The present invention relates to a tubular body having a runner connected to a rotary shaft on its top surface, a wing piece provided on the outer periphery of the tubular body and provided in an inclined state to be retracted in the rotational direction at an angle with the axis, and By disposing the drum rotor, which has the blades extending from the end edge of the cylindrical body and protruding downwardly, in the vicinity of the downstream side of the screen basket, it is difficult for dust to be caught in the rotor of the agitator and the overload operation is strong. Without being
In addition, stable operation is possible without damaging the screen plate, less frequent operation of the equipment due to reject discharge can be performed, the production volume can be greatly improved, and operation stop for removing the entanglement of garbage can be performed. With little removal work, the screening ability is significantly improved,
Even if the raw material has a high concentration, stable operation processing can be easily performed, and there is a practical effect such that the operability can be greatly improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the present invention in use, FIG. 2 is a perspective view of an agitator, and FIG.
4 and 5 are sectional side views of other embodiments,
6A and 6B are side views of the conventional cutting. 1 ... casing, 2 ... screen basket, 3 ... agitator, 4 ... rotary shaft, 5,5 ₁ ... runner, 6 ... cylindrical body 7,7 ₁ ...
Wing piece, 8 ... Raw material supply port, 9 ... Foreign matter discharge port, 10 ... Useful fiber outlet port.

Claims (3)

[Scope of utility model registration request] 1. A casing (1) is provided with a screen basket (2) surrounded by a screen plate in which a plurality of slits or holes are arranged at a predetermined pitch in a drum shape, and a rotor type is provided along the screen basket (2). A papermaking screen in which the agitator (3) is rotatably provided on a rotary shaft (4), and a tubular body (6) having a runner (5) connected to the rotary shaft (4) on the top surface, and the tubular body (6) projecting from the body periphery, wings provided on the inclined state of retracting in the direction of rotation with the axis an angle (7), the tubular member edge (6 ₁₎ from extending projecting downward wings pieces ( An agitator for a papermaking screen, characterized in that a drum rotor provided with 7 ₁ ) is arranged in the vicinity of the downstream side of the screen basket (2). Wherein said agitator (3), the runner (5) on both end faces (5 ₁₎ inside the screen basket in a closed barrel (6) with a upstream and downstream 3: 5 to 5: The agitator according to claim 1, which is divided into five. 3. A wing piece (7) provided on the outer circumference of the cylindrical body (6).
If, tube body edge ₍₆₁₎ than the projecting wing piece ₍₇₁₎ and the agitator according to claim 1 or 2, wherein the sequence at intervals by shifting the phase of the.