SU1412980A1 - Auger-type plasticizer for processing thermosetting materials with fibrous filler - Google Patents

Description

(21) 4J98104 / 23-05

(22) 02.19.87

(46) 07/30/88. Bnhp. № 28 (72) O. I. Kvasenkov, V. A. Tatarkin, I. R. Aleksandrovich, B. A. Petrov and S. V. Milov

(53) 678.037 (088.8)

(56) USSR Author's Certificate No. 1127776, cl. B 29 C 45/04, 1984.

USSR Author's Certificate No. 1288084, cl. B 29 B 7/54, 1985.

(54) ISHEKA STYLE ASTERICATOR FOR PROCESSING TESE-REACTIVE MATERIALS WITH A FIBER FILLER

(57) The invention relates to the field of plastics processing. It m. used in chemical industry for kneading and accurate dosing of thermosetting materials with fibrous filler. The purpose of the invention is to increase the stability and reliability of the plasticator. For this, a cylindrical screw section is located in the material vertical cylinder. In the conical loading hopper there is a conical section of the tank. In the transition zone of the conical part of the hopper into the cylindrical neck, the longitudinal grooves of variable depth with a constant cross-sectional area along the groove length are made. The depth of each slot is chosen decreasing to zero in the direction of the exit opening. The width of each groove is chosen to increase to join it with adjacent grooves. When working with fluctuations in the supply of the material into the plasticizer bin, the material moves along the longitudinal grooves without over-compaction. When the material pressure in the lower part of the bunker increases, its slip in the circumferential direction increases relative to the wall of the bunker. The material moves along the longitudinal grooves accelerated due to their filling in the conical section of the loading buffer. There is no resistance to movement on the cyphermal throat. In this way, the pressure of the material in the lower part of the conical hopper is equalized and the material feed is self-regulated as the loading conditions change. 2 hp f-ly. 4 il.

with SS

(/

The invention relates to the processing of plastics and can be used in the chemical industry for kneading and precise dosage.

No thermosetting materials with a single filler when pressed into the product.

The purpose of the invention is to increase the stablity and reliability of plastic

ty ator,

Fig. 1 shows schematically the proposed plasticizer; figure 2 - section of the grooves; on fig.Z - the scheme of grooves with characteristic sizes.

The screw plasticator contains a vertically located material cyrindr 1 with an outlet, a conical feed hopper 2 with a cylindrical throat, inside the inside: 14 of its surface in the transition zone of the conical part into the cylindrical Kyto throat are made of longitudinal grooves 3 variable depth screw auger made with a truncated conical hollow section (and 1BL section section 5 associated with rotation drive 6). The cylindrical section 5 is mounted in the material i-cylinder 1 and the floor is truncated conical and 4 is mounted in a conical loading hopper 2 with axial displacement relative to the longitudinal axis of the material cylinder I by means of a screw thread 7 made with profiles corresponding to the screw thread profile 8 of the cylindrical section 5. IIoiiaH the truncated conic section 4 is connected to the cylindrical section 5 by slotted joints 9 and 10 with different numbers of slots. The screw kneader also contains receiving chambers 11 and 12 with ri-counters 13 and 14 counter-pressure, mounted on the output of the material cylinder. ndra 1, with reciprocating motion in the horizontal plane from 15 gvdrotsilshschra

The longitudinal grooves 3 are made with a transverse area of the groove length, section on a cylindrical throat, the depth of each groove is chosen decreasing to zero in the direction of the exit hole, the width of each groove is increasing before connecting it with adjacent grooves 3. ensuring the constancy of the cross-sectional area

groove 3 on the cylindrical throat, the width of each groove 3 can be chosen non-linearly increasing, and the depth linearly decreasing. In addition, the depth of the roller groove 3 can be chosen to be non-linearly decreasing, and the width linearly increasing to ensure the constancy of the cross-sectional area of the groove 3 on the cylindrical throat.

The screw plate works as follows.

Processing material with the help of any loading device (not shown) is fed into the skull-loading hopper 2. The floor of the truncated conical section 4 of the screw captures the material (zone 1, figs 1 and 2), and, rotating, moves it to the zone the location of the cylindrical section 5 of the screw. In the upper part of the hollow truncated conical section 4 of the screw (zone. 1), the material particles freely move relative to each other and slip relative to the surface of the hopper 2.

In the zone of the beginning of the longitudinal grooves 3 (zone 2, FIGS. 1 and 2), the material swallows and fills the longitudinal grooves 3, while the adhesion of the material to the wall of the conical hopper 2 increases and it moves in the direction of cutting the longitudinal grooves 3.

The implementation of the longitudinal grooves 3 on the cylindrical mouth of the conical hopper 2 (zone 3, figs, 1 and 2) with a constant cross-sectional area along their length ensures the movement of the material along the longitudinal grooves 3 in this zone without over-compaction. To avoid material compaction in the longitudinal grooves 3, the depth of each groove is chosen decreasing to zero in the direction of the outlet orifice and the width of each groove increasing before connecting it to adjacent grooves. In the line of groove junction points (Fig. 3 and 4), the cross-sectional area the annular groove formed is equal to the sum of the cross-sectional areas of all the slots in any place on the cylindrical throat of the hopper 2. This ensures that the material leaves the longitudinal grooves 3 without repacking. In the section of the annular groove, the material coming out of the P EODOLENE of the grooves 3 is caught by the turns of the rotating cylindrical section 5 of the screw and is transported by it to the material cylinder 1.

In case of supply by a transporting device (pneumatic devices, screw feeders, etc.), the performance of which fluctuates due to uneven fluffing and the tendency of fibrous materials to clumping, a large dose of material, its overpacking does not occur in the lower part of the conical loading hopper 2 Since when the pressure of the material in the lower part of the conical feed hopper 2 increases, its slippage in the circumferential direction relative to the wall of the hopper 2 in its upper part increases, while an accelerated movement of the material along the longitudinal slots 3 by virtue of their enhanced filling station on Ko shgcheskom hopper 2 and no resistance to movement of the cylindrical neck. Thus, there is a pressure increase in the material in the lower part of the conical feed hopper 2 and self-regulation of the stability of the auger plasticiser performance. This allows the processing of thermosetting materials with fibrous filler with high reliability and stable performance.

As the material is fed and moved by the screw section 5 of the screw through the material cylinder 1, the material is heated, plasticized, and fed into the receiving chamber 11. During the set dose process, the piston of the hydraulic cylinder 13 moves backwards under the pressure of the dose . When the piston reaches the hydraulic cylinder 13 of the counterpressure of the lower position, the rotational drive b is automatically turned off, the material supply by the cylindrical section 5 is stopped, and the receiving chambers 11 and 12, together with the hydraulic cylinders 13 and. 14 The backpressures are moved to the extreme right position (item 2 in FIG. 1) by the hydraulic cylinder 5.

When the receiving chambers 1 G and 12 are moved, the dose is cut off and it is pushed out by the piston of the backpressure hydraulic cylinder 13 as it moves to the extreme upper position. At the same time, the rotation drive 6 is turned on and the dbzi set into the receiving chamber 12, which is under the material cylinder 1.

After dialing the dose into the receiving chamber 12, the hydrocylinder 15 moves the receiving chambers P and 12 to the extreme left position (pos. 1 in Fig. 1). In this position, the dose is ejected from the receiving chamber 12 by the piston of the counter-pressure hydraulic cylinder 14 and the dose is set into the receiving chamber 11. The cycle then repeats.

In practical calculations of the design design of the bunker 2 in the cutting zone of the longitudinal grooves 3, the following recommendations should be used. The maximum depth of the groove is H, the angle of inclination of the groove on the conical section of the loading hopper, and on the cylindrical throat J-, the length of grooves on the conical H and cylindrical parts of the hopper is determined by the known formulas.

. The minimum width of the groove f is selected in accordance with the average particle size of the processed material. material, this size is chosen in the range of 10-15 mm, and the remaining parameters are chosen arbitrarily, taking into account the following relationships:

. j Oh, at 1st o; (one)

| j- Oh, with 1 (2)

-.f .. Oh, at 1 o; L, - (3)

db dl

de S - is the cross-sectional area of the groove, calculated depending on the shape of the cross-section by parameters;

h - the current value of the depth of the groove on the cylindrical neck;

b - the current value of the width of the groove on the cylindrical neck;

1 - the current value of the distance from the line of the grooves to the zero depth;

L is the length of grooving on the cylindrical neck of the hopper. The number of grooves on the inner surface of the conical boot

Yukgker 2 is chosen in such a way that they join to form an annular groove, the size of which (at least half of the size of the particle size mediums being processed is processed (for fiber Y2-301-0 this size will be 5-7 mm). This size the annular groove contributes to free release of material from the grooves (size d in FIGS. 3 and 4).

; In order to simplify the calculation of the geometrical parameters of the grooves and those of the technological cutting, they limit the variation of one of the variable parameters, n, or depth. You should choose a linear change in one of these parameters, and the other should be defined as its function.

j To perform grooves with linear | depth (fig. 3), it is necessary, depending on the shape of the cross section of the groove and the specified angle y, to determine the function:

- b F (h) (4)

Terms of compliance (1) and conditions

const

 0

(five)

I For making grooves with a linearly increasing width (FIG. 3), it is necessary depending on the shape of the cross section of the groove and

about define function

h f (b) compliance with the conditions

(one)

db.

dl

const 0.

(b)

and condition (7)

The implementation of the grooves on the inner surface of the conical loading hopper in one of the proposed options will improve the reliability of work and achieve a stable performance of auger plasticizer.

j 0

s

20

25

thirty

35

40

45

Claims (3)

1. A screw plastikator for processing thermosetting materials with fibrous filler, containing a vertically positioned material cylinder with an outlet, a conical feed hopper with a cylindrical neck, along the inner surface of which in the transition zone of the conical part into the cylindrical neck are variable longitudinal grooves. cut, made with a cylindrical section placed in the material cylinder, and a hollow conical section mounted in a conical m loading hopper with axial movement relative to the longitudinal axis of the material cylinder, characterized in that, in order to increase the stability and reliability of the plasticator, the longitudinal grooves along the inner surface of the loading bunker are made with a constant groove length, cross-sectional area on the cylindrical neck of the loading the bunker, the depth of each groove is chosen decreasing to zero in the direction of the outlet, and the width of each groove - increasing to the joint it with adjacent grooves. 2. A plasticizer as claimed in claim 1, wherein the width of each groove is non-linearly increased and the depth linearly choked to ensure that the cross-sectional area of the groove remains constant on the cylindrical neck. 3. Plasticizer according to claim 2, so that the depth of each groove is chosen nonlinearly and the width is linearly increased to ensure a constant cross-sectional area of the groove on the neck.