RU2381306C1 - Device for sink of bast-fibers material - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to preprocessing of fibre crops and can be applied to breaker machinery. Device for sink of bast-fibers material contains pairs of rollers with longitudinal and located by helical curve riffles. Riffles of top and bottom rollers are located relative to each other with angular deflection in neighbouring couples for half of pitch of toothing. Under action of riffles of neighbouring couples of rollers layer executes plane-parallel motion and herewith in layer there are appeared oscillations of considerable intensity. In the issue there are increases bending stress in layer and inertial forces, operating for chaff in layer that will promote better removing of chaff from layer.

EFFECT: usage of particular invention provides increasing of effectiveness of cleaning of bast-fibers material against chaff and yield of long bast fiber.

4 dwg

Description

The invention relates to the primary processing of bast crops and can be applied to milling machines in order to increase the efficiency of cleaning bast fiber material from a fire and increase the yield of long bast fiber.

The main objective of the mashing process is the destruction of the stem structure, as a result of which the bond between the fiber and the wood should be broken while maintaining the fiber strength [1, p. 184]. In this case, the bonfire formed during the destruction of the stem is partially removed from the layer. A significant part of the bonfire remains in the bast-fiber material and for its removal at the subsequent stage of the primary processing (when scuffing), more intensive processing of the material is required, which inevitably leads to a decrease in the yield of long fiber.

Thus, in the process of mashing, it is necessary to provide conditions for the maximum removal of fires.

The solution to this problem is possible by various methods.

A device is known for scouring bast-fiber material [2], in which, in order to increase the efficiency of cleaning material from a fire, pairs of rolls with disks coaxially arranged on them are installed between pairs of rolls with longitudinal flutes.

The disadvantage of this device is to complicate the design and increase the size of the grinding machine.

The closest in its technical essence and the achieved effect to the claimed proposed invention is a device for promin bast-fiber material [1, p.183 ... 201, 240 ... 260], which is selected as a prototype.

This device contains pairs of corrugated rolls with longitudinal and helical corrugations.

This device does not provide effective removal of bonfires from a portion of the layer located between adjacent pairs of rolls, due to insufficient dynamic effects on it.

The objective of the invention is to increase the efficiency of cleaning the bast-fiber material from a bonfire with a promine by increasing the dynamic effects on the layer in the roll space.

The solution to this problem is achieved by the fact that in the device for the promin of the bast fiber material containing pairs of rolls with longitudinal and helical riffles, according to the invention, the riffles of the upper and lower rolls are located relative to each other with angular displacement in adjacent pairs by half of the groove step.

The installation of rollers with the displacement of the corrugations by half of the corrugation step makes it possible to intensify the dynamic effects on the layer and the campfire due to the fact that the ends of the layer section between the wrinkled fields of adjacent pairs of melt rolls move in opposite directions under the action of the corrugations, and the layer itself performs plane-parallel motion.

The invention is illustrated by drawings.

Figure 1 presents a diagram of a device for sculling bast-fiber material with the installation of rolls according to the invention, when the grooves of the upper and lower rolls are located relative to each other with an angular offset in adjacent pairs by half a step of the corrugation. Figure 2 shows the layout of the corrugations when the rolls are rotated by the corrugation angle. Figure 3 presents a diagram of a device for scouring bast-fiber material with the installation of the rolls, when the grooves of the upper and lower rolls in adjacent pairs of rolls are located relative to each other without bias. Figure 4 shows the location of the grooves when turning the rolls at the angle of the grooves for the circuit in figure 3.

The device for prominov bast-fiber material contains a pair of rolls A and B with longitudinal flutes. In figure 1 and figure 2 it is indicated: 1 and 2 - corrugations in the crumple field of the lower and upper rolls of pair A, respectively, with 2α being the corrugation angle; 3 - the flute of the lower roll of pair B, rotated half the angle of the corrugation with respect to the flute 1 of the lower roll of pair A; 4 - flute of the upper roll of pair B, rotated half the angle of the corrugation with respect to flute 2 of the upper roll of pair A; 5 - layer and its position in the roll space.

The layout of the riffles in figure 3 and figure 4 is presented for comparison with the proposed device.

A comparative analysis of the presented schemes shows that the layer in the roll space will move differently. In the diagram of FIG. 3 and FIG. 4, the layer moves progressively. In the proposed scheme in figure 1 and figure 2, the layer performs plane-parallel motion. Being in the roll space, the layer, in addition to the longitudinal displacement, performs an oscillatory motion excited by the corrugations. Due to this, at the moments of changing the direction of movement of the ends, the layer is shaken more intensively. In addition, under the action of the noted movements of the ends, transverse vibrations occur in the layer, which, at certain ratios of the structural and technological parameters of the rolls and the layer, can have a greater intensity.

The device operates as follows.

The layer of stems 5 after a promin in the mint pair A enters the next pair B. Under the action of the corrugations of adjacent pairs of rolls, the layer performs plane-parallel motion and, at the same time, vibrations of considerable intensity occur in the layer.

As a result, bending stresses in the layer and inertial forces acting on the bonfire in the layer increase, which will contribute to better removal of the bonfire from the layer.

Using the proposed device does not require significant capital investments, its implementation can be carried out by reconfiguring the working bodies of the existing milling machine.

Information sources

1. Markov V.V., Suslov N.N., Trifonov V.G., Ipatov A.M. Primary treatment of bast fibers. - M.: Light Industry, 1974. - 416 p.

2. USSR author's certificate No. 1196424, cl. D01B 1/10, 1/27, dated 07.12.85.

Claims (1)

A device for basting bast-fiber material containing pairs of rolls with longitudinal and helical flutes, characterized in that the flutes of the upper and lower rolls are located relative to each other with angular displacement in adjacent pairs by half of the groove step.

Images