JPS6319636B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for further grinding coarsely crushed papermaking raw materials to defibrate bound fibers to produce highly flexible fibers suitable for papermaking.

In general, when coarsely crushed raw materials are used as papermaking raw materials, a treatment for disintegrating the bound fibers and fibrillating the fibers, that is, a refining process, is indispensable. The above object was attempted to be achieved by providing a fixed metal disk and a rotary disk, each having a grinding blade, with a required clearance, and passing the coarsely ground raw material between them.

However, the conventional method described above has the problem that the bound fibers are not disintegrated sufficiently, and furthermore, the refiner using a metal disk consumes a large amount of energy and is therefore very uneconomical. Was.

For this reason, in recent years, a system has been considered in which a fixed grindstone and a rotary grindstone are provided in place of the metal disk, and the coarsely crushed raw material is passed between them. It has been found that according to this method, refining can be performed effectively and energy consumption can be significantly reduced. However, on the other hand, when using a grindstone, it is necessary to make the clearance small, and if the clearance is made small in order to rapidly refine coarse raw materials, the ability to take in the raw materials will decrease and the processing capacity will drop sharply. There is a problem with storing it away. Therefore, in order to deal with this problem, it is necessary to install a large number of refiners with different clearances in order to gradually carry out refining, but if each refiner is driven independently, the entire device becomes very large. As a result, the installation space also increases, leading to an increase in equipment costs.

The present invention was made in view of these points.
A pair of rotating grindstones provided on both sides in the direction of the rotational axis of a rotating plate attached to a rotating shaft whose axial movement is fixed; a non-rotating grindstone disposed opposite each of the rotating grindstones; and the non-rotating grindstone. a sliding body for individually fixing and supporting the sliding bodies, a fixed stand for supporting the sliding bodies, and a fixed stand for supporting the sliding bodies so as to be movable in parallel to the rotational axis direction of the rotary grindstone. A sliding means provided between a sliding body and a fixed base is connected to adjust the distance between the two sliding bodies to adjust the clearance between the rotating whetstone and the non-rotating whetstones on both sides. an adjustment sliding device having a plurality of adjustment shafts, the clearance between the rotary whetstone and the non-rotating whetstones on both sides is determined based on the pressure of the raw material introduced into the clearance; A refiner having a raw material supply port airtightly communicating with the inner peripheral side of the clearance formed therebetween and a raw material outlet airtightly communicating with the outer peripheral side thereof is adjusted so that the clearance becomes smaller sequentially. By arranging a plurality of refiners on the top and sequentially connecting the raw material outlet of the refiner with a large clearance to the raw material supply port of another refiner with a small clearance via a flow path, the papermaking raw material can be ground in stages. The structure is such that it is possible to achieve the objectives of uniform and good disintegration and increase of throughput.

Embodiments of the present invention will be described below based on the drawings.

Figures 1 and 2 show an example of the present invention, in which a rotating shaft 4 is formed by attaching a plurality of rotating plates 3 having rotating grindstones 1 and 2 on both sides at a required interval in the axial direction.
The rotary shaft 4 is supported on a fixed base 5 via bearings 6 and 7 so as to be rotatable and fixed against axial movement, and is connected to an output shaft 9 of a drive motor 8. Furthermore, sealing materials 10 and 11 are provided on the outer periphery of the rotating shaft 4 at positions on both side surfaces of the respective rotating plates 3.
It has flange portions 14 and 15 that airtightly form annular flow paths 12 and 13 through the flange portions 14 and 15, and has non-rotating grindstones 16 and 17 on surfaces facing the rotary grindstones 1 and 2, respectively, and further includes Sliding bodies 19 and 20 are provided which are freely movable on the table 5 via rollers 18 in the axial direction of the rotating shaft 4. Furthermore, the sliding body 1
9 and 20 are connected by a plurality of connecting rods 22 that are parallel to the rotating shaft 4 and have reverse threads 21 and 21', and a stepping motor 23 or the like is connected to the connecting rods 22. A device 24 is provided to constitute an adjustment slide.

Note that the connection rods 22 of the clearance adjustment device 24 may be arranged on the left or right without being limited to the top or bottom, and the number of the connection rods 22 is not limited to two, but may be used in large numbers. That is, the connecting rod 22 only needs to be able to hold the sliding bodies 19, 20 with high accuracy and withstand deformation due to internal pressure.

Also, the flange portions 14, 15 or the fixing base 5
are provided with raw material supply ports 25 and 26 that communicate with the annular channels 12 and 13, and are provided with raw material supply ports 25 and 26 that communicate with the annular channels 12 and 13,
A casing cover 29 is provided around the outer circumferences of the casings 16 and 17 to form an airtight annular flow path 28 using a sealing material 27, and a raw material outlet 30 is provided at a predetermined position of the casing cover 29. Due to the above, a plurality of refiners 31a, 31 are provided on the rotating shaft 4.
b, 31c are configured.

Furthermore, the coarsely crushed raw material 32 is introduced into the raw material supply ports 25 and 26 of the first refiner 31a, and the raw material outlet 30 of the first refiner 31a is introduced.
and the raw material supply port 25 of the second refiner 31b,
26 through a flow path 33, and further connect between the raw material outlet 30 of the second refiner 31b and the raw material supply ports 25, 26 of the third refiner 31c through a flow path 34, and the last stage Refiner 31c
The refined raw material 35 is taken out from the raw material outlet 30 of. Further, in the above, the clearance adjustment device 24 is used to adjust the clearance between the rotating grindstones 1 and 2 and the non-rotating grindstones 16 and 17 so that the clearances become narrower in the order of the first, second and third refiners.

In the above configuration, the coarsely crushed raw material 32 is supplied to the raw material supply port 25 of the first refiner 31a at a required pressure.
When the drive motor 8 is driven in the state in which the raw material is supplied to The raw material is then directed to the raw material outlet 30. At this time, the sliding bodies 1 are connected by the connecting rod 22 so that the interval can be adjusted.
Since the grinding wheels 9 and 20 can freely move in the axial direction with respect to the fixed table 5, the clearance between the rotating grinding wheels 1 and 2 and the non-rotating grinding stones 16 and 17 is determined by the amount of the coarsely crushed raw material acting on both clearances. By moving the sliding bodies 19 and 20 based on the pressure of 32, a balanced state is naturally adjusted (determined).

In other words, when there is a difference between one clearance and the other, the static pressure in the axial direction applied to the non-rotating wheel with the smaller clearance is more hydrodynamic than the static pressure applied to the non-rotating wheel with the larger clearance. As a result of the increased size, the sliding bodies 19, 20 are moved to the non-rotating grindstone side where the clearance is smaller, and both clearances are naturally adjusted to achieve a balanced state. Since the clearance of the first refiner 31a is set relatively large, the coarsely crushed raw material 32
The main purpose is to grind the coarse raw material fibers inside.

The raw material ground in the first refiner 31a is passed through the flow path 33 to the second refiner 31b.
is guided and further ground. At this time, since the clearance of the second refiner 31b is set smaller than that of the first refiner 31a,
Further fine grinding is performed.

Subsequently, the raw material is guided through the flow path 34 to a third refiner 31c having a smaller clearance, where it is ground and taken out as the target refined raw material 35.

By doing so, the coarsely crushed raw material can be continuously refined.

In addition, at this time, each refiner 31a, 31
If the clearances of the refiners 31a, 31b, and 31c are changed, the throughput of each refiner 31a, 31b, and 31c may change. For this reason, in the present invention, if there is one first refiner 31a with a large clearance and the highest processing capacity, there are two second refiners 31b,
The clearance of each refiner is adjusted so that the number of subsequent refiners can be increased as needed, such as three or four third refiners 31c, and the sum of the processing capacities of the front and rear stages is the same. Adjustment can be made using the device 24. Therefore, by doing this, it is possible to effectively refine the coarsely crushed raw material while continuously driving a plurality of refiners with one drive motor without reducing processing capacity. Can be done.

It should be noted that the present invention is not limited to the above embodiments, and is not limited to the number of refiners arranged on one rotating shaft, and the clearance adjustment device can be finely adjusted remotely. Therefore, it is possible to adopt a stepping cylinder, hydraulic control system, etc., the axis of rotation may be tilted or vertical, and the case where the clearance adjustment device is provided at the top and bottom of the refiner is illustrated. Of course, it may be provided at a side position, and various other changes may be made without departing from the gist of the present invention.

According to the paper-making raw material grinding apparatus of the present invention described above, the following excellent effects can be achieved.

(i) By arranging a plurality of refiners on the same rotating shaft and guiding the raw material sequentially to the refiners whose clearances are set to become narrower, papermaking raw materials can be milled continuously and effectively. be able to.

(ii) The problem of reduced throughput can be solved by changing the number of refiners in the refining stage depending on the size of the clearance.

(iii) By installing a plurality of refiners on the same rotating shaft, the entire device can be downsized, and installation space and equipment costs can be reduced.

(iv) Sliding bodies that support non-rotating whetstones placed on both sides of the rotary whetstone are connected to each other by screw shafts so that the distance between them can be adjusted, and the sliding bodies support the rotary whetstone along the upper surface of the fixed table. Since it is configured to be able to move freely in the axial direction of the rotating shaft, the clearance between the rotating whetstone and the non-rotating whetstones on both sides is
Both clearances can be naturally adjusted according to the pressure of the raw material acting on them, and thereby a plurality of refiners can be arranged on the same axis and the clearance can be adjusted with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view showing one embodiment of the present invention;
FIG. 2 is a view taken along the - arrow in FIG. 1 and 2 are rotating grindstones, 4 is a rotating shaft, 5 is a fixed stand,
8 is a drive motor, 16 and 17 are non-rotating grindstones, 1
9 and 20 are sliding bodies, 24 is a clearance adjustment device, 25 and 26 are raw material supply ports, 30 is a raw material outlet,
31a, 31b, 31c are refiners, 33,
34 indicates a flow path.

Claims (1)

[Scope of Claims] 1. A pair of rotating grindstones provided on both sides in the direction of the rotational axis of a rotating plate attached to a rotating shaft whose movement in the axial direction is fixed, and a pair of grindstones disposed opposite to each of the rotating grindstones, respectively. a rotating grindstone, a sliding body for individually fixing and supporting the non-rotating grindstone, a fixed base for supporting the sliding body, and a sliding body on the fixed base in the direction of the rotational axis of the rotating grindstone. A sliding means is provided between a sliding body and a fixed base to support the sliding body so as to be movable in parallel; An adjustment slide having a plurality of adjustment shafts for adjusting the clearance between the rotating grindstone and the non-rotating grindstones on both sides based on the pressure of the raw material introduced into the clearance between the rotating grindstone and the non-rotating grindstones on both sides. Equipped with equipment,
Further, a refiner is adjusted such that the clearance is successively smaller, the refiner having a raw material supply port airtightly communicating with the inner circumferential side of the clearance formed between the grinding wheels, and a raw material outlet airtightly communicating with the outer circumferential side thereof. Grinding of papermaking raw materials, characterized in that a plurality of refiners are arranged on the rotating shaft, and the raw material outlet of the refiner with a large clearance is sequentially connected to the raw material supply port of another refiner with a small clearance via a flow path. Device. 2. Claim 1, wherein the sliding means is a roller rotatably mounted on the flat upper sliding surface of the fixed base.
A grinding device for papermaking raw materials as described in Section 1.