SU1168423A1 - Device for disintegrating fibres and preparing fibre-filled compositions - Google Patents

Abstract

1. A DEVICE FOR CUTTING FIBERS AND PREPARING FIBER COMPOSITSM, containing a fiber cutting mechanism with fixed and mounted on the drive shaft movable knives, a fiber feeding mechanism, a feeder for. supplying the polymer to the chamber and the branch pipe, characterized in that, in order to reduce the heating and wear of the knives and stabilize the cutting process, the device is equipped with a plate spring, one side of which is fixed to the drive shaft, and the other side is in contact with the end of the movable knife , the other end of which is mounted on the drive shaft is hinged, while the cutting edge of the fixed knife is made concave. 2. The device according to claim 1, is molded by the fact that, in order to improve the removal of the composition from the chamber, the device is equipped with a nozzle that is in common with the pneumatic system and is installed% is 5 "long at the bottom of the chamber at the branch pipe.

Description

4 YO

one

The invention relates to the polymer machinery industry, mainly to the equipment for rubber, tire and plastics industries, and can be used for grinding fibers and making fiber-filled compositions.

The aim of the invention is to reduce the heating and wear of the blades and stabilize the cutting process.

Figure 1 shows the proposed device, a general view of figure 2, view A in figure 1 and the location of coordinate axes, in the system of which the shape of the cutting edge of a fixed knife is determined; in FIG. 3, node 1 in FIG. figure 4 - node II in figure 1; figure 5 view B in figure 4; Fig.6section bb in Fig.1.

The device contains a chamber 1 in which a cutting mechanism is located. In the upper part of the chamber there is a feeder 2 for feeding polymer, and in the lower part there is a branch pipe 3 with a nozzle 4 and a conveying sleeve 5. On the front wall of the chamber there is a mechanism 6 for feeding fiber to the cutting Mechanism 7.

The cutting mechanism 7 consists of a drive shaft 8 placed in an end groove and pivotally fixed thereto by means of a finger 9 of the movable knife Yu, a pressure plate spring 11 mounted on the shaft 8 on the counterweight 12. The spring 11 presses the movable knife 10 against the stop 13 on the drive shaft 8 In addition, in the cutting mechanism 7 includes a fixed knife 14, having a cutting edge 15, which is made of a concave shape.

To adjust the preload force of the movable knife, the spring 11 has an opening at its end for mounting an adjusting screw 16 fixed by nuts 17.

The device works as follows.

The driving shaft 8 drives the movable knife 10, which is pressed by the spring 11 to the stop 18. The movable knife attaches to the cutting edge 15 of the stationary knife 14, which is a concave-shaped curve, I determined by the dependence

V „Рнхг-р„ К „х Уf в

684.232

where X, y - cutting coordinates

edges, CMj

P const - axial force at a point

the contact of the knives, H 5 "t force the spring,

n;

Rf ,. - distance along the X axis from the origin to the point of application of force

springs, CMj

Cj - spring stiffness, N / cm,

This dependence is obtained from the condition of constant axial force in

5 point of contact of the knives.

The inclination of the cutting edge 15, the movable knife 10 rotates around the finger 9, pressing the spring 11. In the contact zone of the knives, a force arises, the main component of which is directed along the axis of the drive shaft and the magnitude of which depends on the force of pressing the spring and the distance from the contact point to shaft axis. Due to the fact that the edge is filled with a concave shape, the axial force maintains a constant value.

For a smooth rolling

0 knife on cutting edge provides a smooth transition area. The spring preload force can be adjusted by a screw 16, depending on the material being ground.

The fiber 16 is fed by the feed mechanism 6 to the fixed knife 14 and along it to the cutting zone. Cutting takes place on the cutting edge 15 of the unfastened knife 14 when the movable knife Y is attached to it. Simultaneously with cutting the fiber, the polymer enters chamber 1 through the feeder 2. At the moment the polymer enters the chamber 1, it

5 is sucked in by a circulating vortex flow created by rotating the counterweight 12 mounted on the drive shaft 8. Due to the low inertia of the polymer and fiber, the mixture obtained is well mixed due to the high turbulence of the vortex flow.

Then the flow of the mixture comes from 55 chamber 1 to the branch pipe 3

and the air flow from the nozzle 4 is transported by sleeve 5 to the processing machine.

31168423-4

In the proposed device, the quality of grinding of noBceii is ensured by the constancy of the axial force in the length of the cutting part, because of this the contact of the knives is eliminated, which ensures that the fiber is smoothed and fluffed.

Vozuk

Ml

/ g

15

17

/ f

Fi.2

S

10 F (g.Z.

View b

Fig.Ch

FIG. five

Turning around the note

/ e

J / lt

W

-Ki

6

Claims (2)

1. DEVICE FOR GRINDING FIBERS AND PREPARING FIBERFILLED COMPOSITIONS, containing a fiber cutting mechanism with a movable knife fixed on a drive shaft and a movable knife mounted on the drive shaft, a fiber feeder, and a feeder. polymer supply to the chamber and the branch pipe, characterized in that, in order to reduce the heating and wear of the knives and stabilize the cutting process, the device is equipped with a leaf spring, one side of which is fixed to the drive shaft, and the other through the adjusting screw is in contact with the end of the movable knife, the other the end of which is pivotally mounted on the drive shaft, while the cutting edge of the fixed knife is concave. 2. The device according to claim 1, wherein the, in order to improve the removal of the composition from the chamber, the device is equipped with a nozzle connected to the pneumatic system and installed at the bottom of the chamber at the branch pipe. SU. „, 1168423> 11684.23