SU1288084A1 - Screw kneader for treating thermosetting materials with fibrous filler - Google Patents

Abstract

The invention relates to the chemical industry and m. B. used for kneading and accurate dosing of thermosetting materials with fibrous filler. The aim of the invention is to improve the performance, stability and reliability of the plasticiser. For this, a cylindrical section of the screw is located in the material vertical cylinder, and a conical section of the screw is located in the conical feed hopper. In the loading bunker, the longitudinal grooves are flattened out along its inner surface, and the COP is made truncated in the plane, which coincides with the plane of the beginning of the longitudinal grooves from the top of the cone at the lower position of the COP. When working with fluctuations in the supply of material into the hopper in the groove zone, the material is not cut by screw cutting, but slips relative to the cut plane of the CS. At the same time, in the upper part of the CS, the material slips in the circumferential direction, not moving in the axial direction. T. o. there is a decrease in pressure in the lower part of the loading hopper without cutting the material in the grooves and without stopping the supply of material. After rebalancing, the material in the upper zone of the feed hopper stops rotating in the circumferential direction and begins to move in the axial direction. The supply of material from the upper zone of the feed hopper to the lower zone is restored. T. o. self-regulation of the CS material supply is provided when loading conditions change. This allows the processing of materials with fibrous filler with high productivity, stability and without fear of destruction of the components of the plasticizer construction. 6 Il. W n :) 00 00 00

Description

The invention relates to equipment for the processing of plastics and can be used in the chemical industry for kneading and accurate dosing of thermosetting materials with fibrous filler when they are pressed into the product.

The purpose of the invention is to improve the performance, stability and reliability of the plasticator.

material and mixes it in the zone of the cylindrical section 5 of the screw. In the upper part of the truncated conical section 4 of the screw (zone 1, figs. 2 and 5), the material particles move freely relative to each other due to the lack of sufficient compaction and slip relative to the surface of the hopper 2.

The movement of the material in the area of the grooves 3 (zone 2, Fig. 2 and 5) occurs

Fig. 1 shows a screw plate along the slots, wherein the material is a distributor for processing thermally reactive pressure and is compacted. Kolebematerialov with fibrous filler,

General view; FIG. 2 — node I in FIG. one,

performance of transporting devices (pneumatic devices, screw feeders, etc.), despite the tendency

FIG. 2; in fig. 4 is a section BB in FIG. 2; fibrin to clumping, does not lead to

in fig. 5 - node P in FIG. 2, an incision; this plasticator to a sharp re-cut; in fig. 3 - section AA

on

in fig. 6 is a diagram with characteristic dimensions of a groove, hopper, auger. The screw kneader contains a vertically positioned material cylinder 1, a conical feed hopper 2 20 with longitudinal grooves 3 along the inner surface (the grooves are located from the transition line of the conical surface of the hopper 2 into the cylindrical material cylinder 1 for screws with a diameter of 40-90 mm

the material in the zone of the grooves 3, the length of which is determined by the combination of the geometries of the grooves 3, the screw and the conical hopper. This is explained as follows.

In the area of the grooves 3 on the conical surface of the hopper 2 (zone 2), the material is not cut by conical cutting, but slides relative to the cutting plane of the coil of the conical section 4 of the screw from the top of the cone (plane B-B, Fig. 5). At the same time, the material located in the upper part of the conical section 4 of the screw (zone 1, Fig. 5) begins to slip relative to the conical surface of the hopper

a distance of 0.4-0.7 in diameter), a screw screw cutted with a truncated hollow conical section 4 and a cylindrical section 5 connected with a rotational drive 6. The cylindrical section 5 is placed in the material cylinder of zo 2 in the circumferential direction, practically not 1, and the floor of the conic section 4, is made-moving in the axial direction. Thereby, the process is truncated in a plane that coincides at its lower position from the side of the cone tip with the plane of the beginning of the longitudinal grooves 3 on the inner surface of the bunker, mounted in the feed hopper 2 35 of the weight between the material feed and the axial displacement of the relative 4 and the cylindrical 5 sections of the length-wise axis, by means of the screw in zone 1, ceases to rotate with the screw thread 7, which is made with a profile, which is in the circumferential direction and begins

corresponding to the profile of the screw to move in the axial. The feed of the cutting material 8 of the cylindrical section 5. Zola from zone 1 to zone 2 by the conical section 4, the truncated conical section 4 is connected to the screw. In this way.

The pressure is reduced at the bottom of the loading hopper 2 without cutting the material in the slots 3 and, accordingly, without stopping its supply. After restoration by ravobravom,

self-regulation of the feed by the cone section 4 of the screw is provided when the conditions of its loading change. This allows the processing of material with a fibrous cut.

with cylindrical section 5 by means of two slotted joints 9 and 10 with different number of slots.

The plasticator also contains hydraulic cylinders 11 and 12, chambers 13 and 14, a high-performance hydraulic fluid 45, a cylinder 15 and a guide bar 16. The operation stability and without fear of development of the splined joints 9 and 10 are made in a splined hub 17.

Plasticizer works as follows.

The material to be processed is fed by pneumatic conveying (not shown) or any other device into the hopper 2. The conic section 4 of the auger, made truncated in a plane, is used. coinciding from the side of the cone apex with the plane on jj when the piston of the hydraulic cylinder 11 reaches the longitudinal grooves 3 on the inner lower position, the vrash drive 6

the surface of the bunker 2, rotating, grips-automatically and off

Rasheni individual elements of the designs of auger plasticator.

As the material is fed and moved in the cylindrical section 5, the material is heated, kneaded and fed into the receiving chamber 13. During the set of a given dose of material, the piston of the hydraulic cylinder 11 moves downward under the action of the pressure generated in the dose. With

material and mixes it in the zone of the cylindrical section 5 of the screw. In the upper part of the truncated conical section 4 of the screw (zone 1, figs. 2 and 5), the material particles move freely relative to each other due to the lack of sufficient compaction and slip relative to the surface of the hopper 2.

The movement of the material in the area of the grooves 3 (zone 2, Fig. 2 and 5) occurs

 along the grooves, whereby in the material the material is split in the zone of the grooves 3, the length of which is determined by the combination of the geometries of the grooves 3, the screw and the conical hopper. This is explained as follows.

In the area of the grooves 3 on the conical surface of the hopper 2 (zone 2), the material is not cut by conical cutting, but slides relative to the cutting plane of the coil of the conical section 4 of the screw from the top of the cone (plane B-B, Fig. 5). At the same time, the material located in the upper part of the conical section 4 of the screw (zone 1, Fig. 5) begins to slip relative to the conical surface of the hopper

2 in the circumferential direction, practically not moving in the axial direction. Thus, the progression between the material feed of the conic 4 and the cylindrical 5 sections makes it difficult to reduce the pressure in the lower part of the loading hopper 2 without cutting the material in the grooves 3 and accordingly without stopping its supply. After recovery, move in axial direction. The feed of material from zone 1 to zone 2 by the conical section 4 of the screw is restored. In this way.

in the way

self-regulation of the feed by the cone section 4 of the screw is provided when the conditions of its loading change. This allows the material to be processed with a fibrous filler with high productivity, stable operation and without fear of development.

with high performance, stable operation and without fear of

reaching the piston of the hydraulic cylinder 11 of the lower position of the actuator 6 vrasheni

Rasheni individual elements of the designs of auger plasticator.

As the material is fed and moved in the cylindrical section 5, the material is heated, kneaded and fed into the receiving chamber 13. During the set of a given dose of material, the piston of the hydraulic cylinder 11 moves downward under the action of the pressure generated in the dose. With

Measures 13 and 14 together with hydraulic cylinders 11 and 12 are moved along guide plate 16 by means of hydraulic cylinder 15 to the extreme right position (pos. II). When moving receiving chambers 13 and 14, the dose is cut off. The dose is pushed out of the cavity of the receiving chamber 13 under the action of the piston of the hydraulic cylinder 11 when it is moved to the upper end position. At the same time, the dose is set into the receiving chamber 14, which is under the cylindrical section 5. After the dose is set into the receiving chamber 14, the hydraulic cylinder 15 moves the receiving chambers 13 and 14 together with the hydraulic cylinders 11 and 12 to the extreme left position (pos. I). In this position, the dose is ejected simultaneously from the receiving chamber 14 and the dose is set into the chamber 13. Subsequently, the cycle repeats.

The beginning of the location of the grooves on the conical surface of the hopper 2 and, accordingly, the location of the slice of the conical section of the screw depends on a number of geometrical parameters of the groove, hopper, and the cylindrical section of the screw. The mathematical formula, the derivation of which is given below, makes it possible to connect the length of the groove on the conical surface of the bunker with a number of geometrical parameters of the bunker, the cylindrical section of the screw, the groove.

From the geometry of the longitudinal groove and the hopper (Fig. 4), by the sine theorem, we have L. - .1.SP

And -

Transforming expression (1) relative to //, we get

H -, (2)

where H is the distance between the beginning of the longitudinal grooves on the surface of the bunker and l {1 the transition of the conical surface of the bunker into the cylindrical material cylinder, L is the distance between the end of the longitudinal grooves on the surface of the material cylinder and the transition line of the conical surface of the hopper in the cylindrical material cylinder;

P is the angle of inclination of the conical hopper;

 - the angle of inclination of the longitudinal groove, which can be determined from the expression

wives

Neither

L

where Hfi is the maximum depth of the groove.

Experimental studies have shown that the length of the groove in the material cylinder (zone 3) should be equal to one auger diameter:

,

ten

20 25

thirty

35

45

50

55

where D is the diameter of the screw, and the maximum depth is equal to the average particle diameter of the material, i.e. LL 10-15 m.m.

Then for screws with a diameter of 40-90 mm

min arcsin- 6.41, glad arc sin l 19.4 degrees

Accepted in p 60 °, we find by the formula (2) the maximal and minimal values of H.

For screws with a diameter of 40-90 mm

H (0.4-0.7) D, (4)

moreover, a smaller value of the coefficient refers to a larger value of the diameter of the screw.

Thus, the diameters of the screw auger from the expression (4), you can always find the length of the groove 3 in the conical bunker 2 and, accordingly, the sectional plane of the conical cutting В-В (Fig. 5) provided that at the time of truncation the conical section is in the lower position, i.e. with a gap equal to 0.

The proposed plasticizer, by making the conical section truncated in a plane that coincides from the top of the cone with the plane of the beginning of the longitudinal grooves on the surface of the bunker, allows to feed thermosetting materials with fibrous filler with a sufficiently high performance at any unstable material supply to the screw plasticizer. In addition, the self-regulation of the material supply by the truncated conical section of the screw when changing the conditions of its filling increases the reliability of the screw auger, eliminates the possibility of destruction of its structural elements by eliminating over-compaction of the material in the slot area. The use of screw plasticizers with the proposed loading unit significantly intensifies and fully automates the process of forming products, eliminates intermediate operations and releases a significant number of personnel involved in the operations of tabletting, storage, transportation of tablets and maintenance of presses.

Claims (1)

Invention Formula Screw plastikator for processing thermosetting materials with fibrous filler, containing vertically located material cylinder and conical loading hopper with longitudinal grooves on the inner surface, screw with screw thread, connected to a rotation drive and made with a cylindrical section placed in a material cylinder and a hollow conical section mounted in the hopper with the possibility of axial movement relative to the longitudinal axis by means of a screw thread, made minutes with a profile corresponding to the profile of the cylindrical screw thread section of the screw and connected with the latter by means of two splined connections to different numbers The splines are characterized in that, in order to improve the performance, stability and reliability of the plasticizer, the conic sections are made truncated in a plane that coincides from the apex of the cone with the plane of the beginning of the longitudinal grooves along the inner surface of the hopper when the conic section is in the lower position. LI .ff Aa 6-5 Fig.Z fig L  i Conic / a section Ses cut f slot area LoVerhnos / P cut material S grooves CM FIG. five srig.6 Editor I.Nikolaychuk Order 7760/17 Compiled by I. Skopintsev Tehred I. VeresKorrektor V. Butt ha Circulation 587 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 1 13035, Moscow, Raushsk nab., 4/5 Production and printing company, Uzhgorod, ul. Project, 4