JPS642435B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thickness sorting device for sorting flat objects such as wood chips according to their thickness.

Traditionally, the most common sieving equipment is
A screen with a desired size of screen openings is used to sieve into those that are large enough to pass through the openings and those that are not large enough to pass through the openings. When this type of conventional screen is used to sift flat materials such as wood chips, the flat surface comes into contact with the vibrating screen, so sieving can only be done by the size of the flat surface, and it is impossible to sift by thickness.

However, in many cases, sieving based on thickness is more necessary than sieving based on the size of the flat surface.
Specifically, the wood chips mentioned above are 25mm x 25mm x 6mm.
The standard size is 25 mm x 25 mm on an oblique surface using conventional equipment.
The size of the millimeter surface can be sieved within a range that does not cause any problems in the subsequent pulping process. However, in the case of kraft pulping (referred to as the KP method), which is the most commonly used method for pulping wood chips, wood chips are steamed in a chemical solution under high pressure and temperature to separate the lignin that binds cellulose fibers. However, if the wood chips are too thick, the high-temperature chemical solution will not penetrate into the wood chips, and the pulp will contain undigested solid knots. If you allow enough steaming time to avoid including these solid knots,
Other thin wood chips are overcooked, the semi-cellulose component that is easily altered by chemicals is decomposed, resulting in poor yields, and unnecessary heat energy and chemicals are required, which is uneconomical. Therefore, if wood chips with a certain thickness or more can be sorted out, they can be taken out and processed into two-sided slices, or they can be split to make it easier for the chemical solution to penetrate.

Furthermore, it has been suggested that a desk screen may be used for the above-mentioned thickness selection. This desk screen is as shown in FIGS. 5 and 6, with parallel axes 51, 51, 5
A large number of disks 52 rotated by the shaft 51 are arranged in 1..., and each disk 52 of the adjacent shaft 51, 51 is arranged.
The approximate radius of each disk 52, 2 is alternately located.
The interval C1 between 2, 52, . It is sifted while being sent in the same direction. However, as a result of experiments, this desk screen has low sieving efficiency because only the oblique plane moves in contact with the disk 52, and also has a valley at the lap point between the disk 52 and the disk 52 of the adjacent shaft 51. It has been found that oversized objects are difficult to rotate and be ejected in this trough, resulting in a decrease in efficiency.

Therefore, the present invention has produced a new type of thickness sorting device that solves the above-mentioned drawbacks.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

In the figure, 2, 2 is a vertical frame. On these vertical frames 2, 2, there are long comb plates 1 whose upper sides 11 are formed in a corrugated shape, with their longitudinal ends slanted downward, and a large number of comb plates 1 are arranged in parallel at predetermined intervals. Thus, an inclined comb plate array 10 is formed.

The above-mentioned comb dividing plate 1 is designed so that the distance from the top of one crest to the top of the next ridge of the corrugation on the upper side 11, that is, the pitch P of the corrugation, is about the average size of the raw material M to be sorted. It is larger than the maximum dimension of the flat surface portion (hereinafter simply referred to as the maximum dimension of the raw material).

This means that if the pitch P of the waveform on the upper side 11 is smaller than the maximum dimension of the raw material, the raw material M will rest on two or more peaks of the waveform on one comb plate 1,
This is because the height difference due to the phase change of the waveforms of the upper sides 11 of the adjacent comb plates 1, 1, which will be described later, cannot be effectively obtained. In addition, each comb plate 1 arranged in parallel,
The intervals between 1, 1, and so on are such that the distance C2 between each and the adjacent one is larger than the maximum dimension of the raw material, and the raw material M is divided into multiple combs so that the phase change of the waveform on the upper side 11 does not occur. The raw material M is placed between the plates 1 and 1 at the same time, and the difference in height of the upper side 11 of the comb plate 1 in the middle is the raw material M.
This prevents it from having any impact on the

Furthermore, each of the comb plates 1 is provided with slopes 12, 12 which are made thinner on the lower end side, but this is because the comb plate 1 is long, so the height H1 is higher than a predetermined height in terms of strength. The higher this height H1 is, the more easily the raw material M gets stuck between the adjacent comb plates 1 and 1. Therefore, the raw material M that has entered beyond the predetermined interval C can be reliably removed by widening this interval C downward. It is designed to pass downward. As shown most clearly in FIG. 3, the wall thickness of the comb plate 1 is constant up to the height H2 from the upper end of the comb plate 1 to the bottom of the valley, and the thickness of each comb plate is determined by the phase change of the waveform. The distance C between the upper end portions of 1 and 1 is kept unchanged.

All or part of each of the comb plates 1 reciprocates in the longitudinal direction, and the positions of the peaks and troughs of the waveforms on the upper side 11 of the comb plate 1 are arranged such that the waveforms on the upper side 11 are adjacent to each other. It is connected to a drive source 3 whose relationship is mutually shifted.

In the illustrated example, every other comb plate 1 is fixed to a bridge on the vertical frames 2, 2, and the remaining comb plates are connected to a drive source 3. As most clearly shown in FIG. 3, a long hole 13 is provided on the tip side (right side in FIG. 2), and the shaft 7 fixed on the vertical frame 2 is inserted into this long hole 13, and the other end is inserted into the long hole 13. The side is connected to the shaft 6. Although this shaft 6 is not necessarily clearly shown in the figure, it is made movable by bearings 5, 5 that guide the shaft 6 in the longitudinal direction of the comb plate 1 through elongated holes. This shaft 6 is connected to the crank mechanism 3a of the drive source 3.
It is connected to. Note that another drive source may be connected to the comb plates 1 fixed at every other comb plate so that the comb plates 1 reciprocate in opposite directions every other comb plate. Further, instead of the structure in which the comb dividing plates 1 are arranged side by side as shown in the figure, it is of course possible to arrange the comb dividing plates 1 upright on a frame body and to reciprocate the frame body by an appropriate drive source.

A raw material supply device 20 is disposed above the inclined upper end side of the inclined comb plate array 10. This raw material supply device 20 preferably uses a rotary feeder or the like and supplies a fixed amount of raw materials, but may simply be a chute discharge end.

In the figure, reference numeral 14 is a spring that pulls the tip of the comb plate 1 to prevent the comb plate 1 from deflecting.
A cleaner 8 is located within the interval C between each comb dividing plate 1, and moves back and forth along the comb dividing plate 1 using a drive source 4, and removes the raw material M clogged with the inclined surfaces 8b and 8c of the side surface between the comb plates. It is designed to scrape out above or below 1. In addition, this cleaner 8 prevents the comb part plate 1 from sagging by moving the lower side connecting part 8a along the lower surface of the comb part plate 1, and is positioned between each comb part plate 1, 1, 1... It also serves as a spacer. Reference numeral 21 denotes a discharge conveyor disposed below the inclined lower end side of the inclined comb dividing plate array 10.

Next, the operation of this embodiment will be explained.

First, all or part of the comb dividing plate 1 is reciprocated by the drive source 3, and the raw material M is dropped from the raw material supply device 20 onto the inclined comb dividing plate row 10. Then, raw material M
Because the inclined comb dividing plate array 10 vibrates and is tilted, it moves toward the lower end of the inclination, but at this time, due to the phase change of the waveform on the upper side of each comb dividing plate 1, the contact with the raw material M is caused. The heights of the upper surfaces of the adjacent comb plates 1, 1 are displaced. Therefore, the raw material M is tilted in accordance with the displacement of its upper surface, and falls below the inclined comb plate array 10 from the interval C between the two comb plates 1,1. Of course, at this time, the material M whose thickness is larger than the interval C cannot pass through, so it moves directly above the inclined comb dividing plate array 10 and is discharged from the lower end of the inclination as an oversized material.

The present invention has the above-mentioned structure and operation, and since the flat raw material M is always tilted while moving on the inclined comb dividing plate array 10, it is possible to sort by thickness, and there is an opportunity for the flat raw material M to stand upright. Since there are many, thickness sorting can be done efficiently.

Further, since the raw material M moves sequentially through the inclined comb dividing plate array 10 by its own weight and the vibration of the comb dividing plate 1, there is little retention of the raw material M.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the thickness sorting device of the present invention, FIG. 2 is a partial front view of the main part of the comb dividing plate, and FIG.
4 is a front view of the cleaner section, FIG. 5 is a partial plan view of a conventional example, and FIG. 6 is a front sectional view of the conventional example. DESCRIPTION OF SYMBOLS 1... Comb division plate, 2... Vertical frame, 3... Drive source, 8... Cleaner, 10... Inclined comb division plate row, 1
1... Upper side, 20... Raw material supply device, 21... Discharge conveyor.

Claims (1)

[Claims] 1. A long comb plate 1 having a corrugated upper side 11 is tilted so that its longitudinal end side is downward, and a large number of comb plates are arranged in parallel at a predetermined interval C and tilted. A row of comb plates 10 is formed, and all or part of each of the comb plates 1 reciprocates in the longitudinal direction so that the waveform of the upper side 11 of the comb plate 1 adjacent to the waveform of the upper side 11 of the comb plate 1 is formed. is connected to a drive source 3 that alternately shifts the positional relationship between its peaks and valleys, and a material supply device 20 is disposed above the inclined upper end of the inclined comb dividing plate array 10. Device.