A device for processing wood chips

 

(57) Abstract:

Usage: devices for processing wood chips. The inventive device ledges rolls taper towards the top and have a height equivalent to the desired chip thickness. 8 C. p. F.-ly. 6 Il. table 4.

The invention relates to the pulp and paper industry, in particular to a device for processing wood chips.

In a conventional papermaking process logs being unloaded and turned into chips, and then separated to separate the cellulose fibers from the chip for further processing and forming rolls of paper. The usual way to separate the cellulose fibers consists of vyvarki wood chips in a chemical solution at high temperatures and pressures in the digesters in order to remove lignin from the chips, which holds the fibers together. For further papermaking process, it is desirable that the obtained obuslovlyennyi fiber had essentially the same properties. To reduce getting nevyarovych or perevyazannyh chips in digesters, it is necessary that the penetration of the cooking solution in chips was the same for all St considered desirable to use the device for sorting chips, which simultaneously removes nepolnomernye and emergency chip size so that nepolnomernye can be processed separately, and excessive pass through a device designed to reduce the chip size to its vyvarki.

A device used to reduce the size of excessive shavings, separated from the flow of chips through walls, is a knife for cutting chips. Basic operation of the knife for cutting is the work of the rotor drum in which an excessive amount of chips are driven under the knife and treated them to an acceptable thickness. An example of a knife for cutting chips can be knife, described in U.S. patent N 4235382, issued in the name of William C. Smith, "Method and device for grinding wood chips".

The disadvantage of the invention is that the knives for cutting chips do not provide the processing chip to optimum size in those cases when they're stupid, or if not appropriate speed or load while reducing non-standard sizes tend to produce too small chips.

Known interacting rolls for processing chip excessive amount of compression affecting prom for directions shavings sharp end in the fork between the rollers, with rollers, compression chips across their thickness to at least one-fifth of their original thickness, but not more than one-tenth of their original thickness. After that, the chips provide an opportunity to be heard prior to their original shape with a gap fibers in them by increasing the porosity of chips.

In the well-known inventions opposite closely interacting rolls or splitting the rolls compress the chips to break them in fibers. The rolls are made smooth so that the impact on the chip was only compressive, due to which the structure of the chips varies not only to break the fibers.

Chips tend to hide in the space above the rollers, and, in particular, the largest chip, who require splitting, stuck between the rollers in the upper part of the pair of rolls, and not stretched between them.

Restructurirovanie or cleavage is not acceptable as a normal process due to the low performance of the splitting device and the subsequent impact on the operation vyvarki.

The purpose of the invention a device for processing chip size, providing a reduction in the time required vyvarki, the STS.

Another objective of the invention is to provide a device for processing an excessive amount of chips quickly and efficiently with the fast transmittance while minimizing congestion or clogging of the device.

Another objective of the invention is to provide a device for the processing of wood chips, which splits or razmelchite excessive amount of chips without the formation of small shavings or chips, simple in operation, which requires minimal adjustment for optimal performance.

Another objective of the invention is to provide a device for the processing of wood chips to increase the speed of impregnation solution, in particular large chips, and a device for destructuring wood chips, which would not depend on the specific orientation of the chip between closely interacting rolls.

The goal is achieved by performing closely interacting opposing rotating rolls having aggressive surface. In the preferred construction the rolls have a pyramid-shaped projections made by machining on their surfaces. In the preferred exemplary embodiment, the peaks of the pyramids are located at a distance OA. When working peaks rolls can be accommodated orientations peak-to-peak or peak-to-trough. In the process, the chips are crushed in the direction of fiber orientation, and with the help of this device will be split regardless of how the chip is clamped between the rollers.

The invention differs from known intended for destructuring or splitting devices that aggressive surface of the rolls is not only used for compression chips, but also to break or fracture the chip thickness.

In Fig.1 shows a device for splitting wood chips; Fig.2 section a-a in Fig.1; Fig.3 the portion of the surface of one of the rolls of a device for splitting wood chips; Fig.4 a partial view from the end of one of the pairs of rolls in a device for splitting wood chips; Fig.5 different orientation of the roll; Fig.6 is the same, a different orientation of the roll.

Wood chips in the device 1 is supplied with the switchgear 2, which delivers a steady stream of 3 wood chips to the pairs of upper and lower rolls 4 and 5. A pair of rolls 4 and 5 are placed in the housing 6, having a top opening 7, through which is sourced wood chips 3, and the lower hole 8, through the MIS 9 and 10 to the upper pair of 4 rolls, and the chips passing through the upper pair of rolls, shall be sent by the blades 11 and 12 on the lower pair of rolls 5. The transporting mechanism transports the processed chips from device 1 on the following stages of the process.

The upper pair of rolls 4 includes rollers 13 and 14, located close to the opposed rotating so that the upper recess between the rollers surface moved to the narrow area formed by closely interacting rollers 13 and 14, as shown by the arrows 15 and 16.

The lower pair of rolls 5 includes rollers 17 and 18, closely spaced and opposed rotating so that the upper recess between the rollers surface passed to the narrow area formed by closely spaced rollers 17 and 18, as shown by the arrows 19 and 20.

Each of the rolls 13, 14, 17, 18 rotates in bearings 21, for rotation of the rolls is provided a drive mechanism 22. The drive mechanism 22 includes a motor 23 or other source of energy and drive gear 24. The drive gear 24 drives each of the rollers, however, it is sometimes necessary to give effect to only one roller of each pair of rolls. Smooth roller in each pair of rolls, opposed rotating the roll position can be blank, which is only one roller of each pair. When the chips are received in the device and wedged between the rotating and non-rotating rolls, non-rotating roller will rotate, contributing to the splitting and passing through the wood chips.

Distribution mechanism 22 includes a housing 25 having an aperture 26 for receiving the chips from the feeder chips, switch screw 27 for flow equalization chips along the distribution mechanism and distribution grid 28 through which the chips pass with the distribution mechanism 22 to the first pair of rolls 4. Distribution auger 27 is driven by an appropriate power source 29 and rotates in bearings 30 in the housing 25.

In known installations, use only one pair of rolls or more than two pairs of rolls, and mechanism for feeding chips on a pair or pairs of rolls may be of other types than the distribution mechanism 2 described above.

The surface of the rolls used in the present invention, differ from the surfaces of the rolls used for splitting chips earlier, the fact that the surface of the rolls have an aggressive path. In the exemplary embodiment shown in Fig. 3, the surface of the roll is the basis witheringly V-shaped grooves 32 and axial V-shaped grooves 33 on the roll at right angles. By performing a mechanical processing such intersecting grooves on the surface of the roll is formed of a quadrilateral pyramid, lying radially outward. Each of the protrusions 31 has a peak 34 formed by the remaining material of the outer parts of the machined surface of the roll, and the base 35, the limited depth of the intersecting grooves 32 and 33 in the material area of the machine. Usually both roll roll pairs have the same surface configuration, but you can have one of Valka in each pair smooth or to have a more aggressive or less aggressive contour than the contour of the surface of the other roll in the roll pair.

In one embodiment, the structure was formed, the surface of the roll at which the peaks 34 was placed at a distance from each other in a half inch and each peak had a smooth surface about one-sixteenth of an inch squared. The depth of each pyramid peak 34 to the base was 35 mm

When the use and operation of the device for destructuring wood chips, shavings served on a distribution mechanism 2, and the distribution mechanism 2 is uniformly along the axial length of the first pair of rolls 4. Entering on raspredeliteli, separated in the previous step, sorting, or the entire flow of chips to be recycled into wood pulp in the device.

Possible separation from the flow of chips only nepolnomernyh size and then processing chip unsuitable size and the appropriate size by means of the proposed device.

The device can skip a large amount of chips, providing the ability to handle the entire flow of chips in the car with the exception of dropping excessive shavings. When passing through the device unsuitable size of the chips, there is no need to separate the unsuitable chips for separate processing. Small chips passing through the respective rollers will pass through the raw device and in this case, the split will only unsuitable chip size. After treatment acceptable and excessive size of chips processed chips will be equally meet the educational process wood pulp.

With distribution mechanism 2 chips are in an area over a pair of rolls. The rollers may be rotated separately, and their positions are controlled so that they were aligned with the peaks with the orientation of the grooves as shown in the same process, where in addition to the splitting of the desirable compression, or where appropriate the chip thickness is thin, it may be desirable closely interacting ratio of peak-to-trough, as shown in Fig.6. In other operations, where the flow of energy in the device is minimized, and is driven by one roller of each roller pair and the others remain idle. When the chips are suitable to the rolls and are clamped between them, the idle roller is driven by a drive roller via a drive connection is formed sandwiched between wood shavings.

When the chips pass between the pairs of rolls, regardless of orientation, the chips have a tendency to split or crack parallel to the orientation of the fibers in the chips. This happens regardless, are there chips between the rollers along or forward end.

When applied orientation peak-trough, as shown in Fig.4 and 6, together with pyramidal protrusions, spaced a half inch apart from each other and a height of 6 mm, cracks appearing in the shavings, occur approximately every quarter of an inch. Emerging intermediate distance between the cracks meet acceptable to the thickness of the chips in the operations of clicks is relevant to the penetration of the solution. Rupture of the fibers, resulting compression, penetration of the solution into chips contribute to the holes created by the cracks. The displacement of the material at the crack more for thick chips than thin, and as a result, holes for penetration of the solution are less thick shavings than thin, thereby equating the rate of penetration of the solution into thick and thin shavings. Due to the fact that the rolls are at a distance from each other, the middle of the chip is not shifted, although the offset of the cracks can be significant and chips remain intact without the formation of small particles, splinters or broken chips.

In those cases, when using multiple vertically arranged roller pairs, as shown in Fig.1 and 2, it is expedient to provide smaller swath of space in the lower roller pairs. In this case, excessively exceeding standard dimensions of the chip will be compressed and/or fragmentation of the upper rollers with the formation of acceptable or exceeding the minimum standard size chips that pass through them. These roller pairs will additionally be able to handle significantly larger than the standard size and the minimum is larger than the standard size Botanik one pair of rolls, on which the protrusions of adjacent rolls are in mutual engagement, as shown in Fig.6. To control one sample was not processed, while other samples were cut into pieces known machines for cutting thick shavings. Several samples have been processed so-called soft processing, and other processed hard treatment. When soft processing the distance between the protrusions in the area where the tabs with each roll have the smallest distance from each other, is 6 mm hard When processing the shortest distance between the projections of the rolls was 3 mm

In table.1 shows the characteristics of the different samples, on which the study was carried out.

The samples were classified by the classifier chip SS (Prader Companie). Samples were separated on a trifle, which passes through a circular hole of 3 mm, the chip thickness from 0 to 2 mm; the acceptance of a thickness of from 2 to 8 mm; everything has a thickness more than 8 mm; the other had a thickness of more than 14 mm In table.2 shows characteristics thickness of each sample.

In all samples, except those that have been chopped vertolety chips, 50% or more of the chips in each sample were greater than the maximum established acceptable thickness is remained in a laboratory digester way Kraft vyvarki. Several samples were produced by individual parties in the terms of a separate boiling cycles. One party were produced using a mixture of 15% (85% shavings from samples 3 and 4). The cooking conditions for each batch, and sample type chip described in table.3.

Strength properties of the pulp were calculated after cleaning boiled mass at 30000 rpm. In table.4 shows the results.

As can be seen from the table.4, the length of the break and elongation did not change under the action of the degradation process of the chip. As planed, and split the chips had the same strength characteristics. However, the performance gap, strength and tangled below for split shavings.

Smaller gaps were noted among the range of grinding with minimal breaks chips when their hard processing. When mixed with breaks shavings breaks in weight from a combination of samples 3 and 4 were greater than for the broken chips (sample). Therefore, acceptable for the formation of wood pulp are considered to be mixtures of fissionable chips with conventional chips.

Wood pulp from chips, processed by the device according to the invention, had minimal levels of marriage and considerably smaller than the mass of the floor

Means for processing the excessive size of the chips provides obtaining suitable, acceptable wood pulp, with characteristics similar to the mass obtained from the appropriate size of the chips. The device reduces the formation of fines and defective fibers.

1. A DEVICE FOR PROCESSING WOOD CHIPS, comprising a housing with an inlet for loading the chip and the outlet for discharging the treated chips, means for flow of wood chips and its distribution along the length of the gap of a predetermined size formed between at least one pair of parallel rolls mounted in the housing for rotation, at least one pair of rolls is associated with a rotational drive, and on the surface of at least one of the rolls in the pair performed a multitude of protrusions, wherein the protrusions taper towards the top and have a height, equivalent to the desired thickness of the chip.

2. The device under item 1, characterized in that the projections are made on the surface of both rolls in a pair, while the shape and location of the protrusions on the surface of one and the other rolls in the pair are identical.

3. The device according to PP.1 and 2, Otley which have the shape of a regular square pyramid, which are adjacent to each other.

5. The device according to PP.2 to 4, characterized in that the rolls in the pair is installed with the possibility of placing the vertices of the projections of one roll across the tops of the projections of the other roll in the gap between the rollers.

6. The device according to PP.2-4, characterized in that the rolls in the pair is installed with the possibility of placing the vertices of the projections of one roll opposite to troughs of the other roll in the gap between the rollers.

7. The device according to PP.2 4 and 6, characterized in that the rolls in the pair is installed with the possibility of placing the vertices of the projections of one roll in the hollows of the other roll in the gap between the rollers.

8. The device according to PP. 1 and 2, characterized in that the protrusions are in the form of axisymmetric shapes and their axes arranged radially with respect to the surface of the roll.

9. The device according to PP.1, wherein a distance between tops of the projections essentially equal to their height.

 

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