• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A sieve for plastics processing machines, esp. extruders is fitted between the extruder and the mould. A moving assembly comprising sieve frame, sieve and sieve support plate has a number of parallel rows of holes which constitute the sieve for filtering inhomogeneities out of the plastics. During the extrusion process, this assembly slides slowly relative to the fixed housing so that each row of holes in turn becomes aligned with a row of discharge passages in the fixed housing, which discharge to atmosphere. These passages are on the upstream side of the sieve which, in this region, is cut off from the supply coming from the extruder; thus the flow is reversed through the sieve holes aligned with the passages, causing these holes to be back-flushed. A control valve enable the individual holes of a row to be connected to atmosphere one at a time.
    公开号:SU956277A1
    申请号:SU742003607
    申请日:1974-03-07
    公开日:1982-09-07
    发明作者:Ролле Хельмут；Венде Петер
    申请人:Феб-Пласт-Унд Еластферарбайтунгсмашинен Комбинат Карл-Маркс-Штадт (Инопредприятие)；
    IPC主号:
    专利说明:

    one
    The invention relates to the field of equipment for the processing of polymeric materials, in particular, to devices for (filtering polymer melts during their extrusion.
    A device for an extruder is known (filtering a polymer melt containing an adapter located between the cylinder of a screw press and its {{jerm head), in which a mandrel with two mutually perpendicular melt passage channels equipped with alternating Lilter tubes is installed with rotation. elements, and one of the channels is made in a sleeve with a streamlined outer surface mounted with a gap in the cavity of another channel symmetrically with respect to its longitudinal With the second axis.
    The drawback of the device lies in the low degree of purification of the melt.
    Closest to the invention is a device for extruder for filtering polymer melt, comprising a housing located between the cylinder and the extruder head with channels for supplying drainage and reflux of the melt, in which (1) the rotary unit is installed with the possibility of movement relative to the reverse flow channel openings communicating through the valve with the external environment 2.
    The disadvantage of such a device is the impossibility of cleaning each hole of the filtering unit, which makes the process () illtraction is not effective (x is objective, and the operation of the device is unreliable.
    The purpose of the invention is to improve the cleaning effect of the filter of the block and increase the reliability of the device.
    This goal is achieved by the fact that the device is equipped with a valve block mounted in the housing in which there are openings for communication with the external environment and a valve is installed that sequentially connects each opening of the filtration unit with a return flow channel made in the form of a series of parallel openings coaxially openings m filtering and valve blocks. Fig, 1 shows the proposed device, the section, and the filter unit is located in the housing coaxially; in fig. 2 shows section A-A in FIG. one; in fig. 3 embodiment of the device with a filtering unit located perpendicular to the axis of the housing; in fig. L - section in FIG. 3; in fig. 5 shows an embodiment of the device with a filtering unit made of lamellar and moved perpendicular to the housing axis; in fig. 6 shows a section bb of FIG. five; in fig. 7, a partial cut-out according to FIG. 5. The device for filtering comprises a housing 1 in which a filtering unit consisting of a holder 2, a filter 3 and a holder 4 is mounted for rotation, this unit having holes 5 and mounted coaxially with respect to the axis of the housing on one side parts 6, on the other hand, on the flange | cone 7. The filtering unit has a gear wheel 8 along its perimeter, with which gear wheel 9 is mounted, which means that the filtering unit can rotate. The displacing part 6 has a channel D for supplying the melt divided into several passes a1 in the radial direction of the guide channels D. The channels D enter other distribution channels E which are located in housing 1. Channels E are separated from each other. Rounded the projections 10, running parallel to the axis of the housing 1. In the projections 10, there are channels of reverse flow, made in the form of o and parallel openings Ж, which are arranged in a row that runs perpendicular to the axis of the housing. The axial lines of the holes M are perpendicular to the axis of the body. On the vertices there is a valve block 1 in which there is a control valve 12, made in the form of a valve plug or a flat or piston stopper, and holes 3 are made for communication with the external environment. FIG. 2 is a cross section of the device along line A-A of FIG. 1. Holes 5 are distributed in several segments separated by a considerable distance from each other on the outer surface of the filtration unit. The protrusions 10 separate the distribution channels E from each other as separate chambers, and these protrusions fit snugly to the outer surface of the filtration unit. The valve unit 11 is fixed with a cover 13 in the corresponding recess on the outer surface of the housing 1. The principle of operation of the filtering device is as follows: the mass flow coming from the extruder flows through the inlet channel D, directing channel D to distribution channels E and then through openings 5 of the filter unit to channel I for retraction (esplav. Foreign particles in plastic mass, osaka is given in the holes of the filtration unit 5. With the increasing number of impurity inclusions and thus with a reduced filtration area, the mass pressure in the space is constantly increased in front of the loaded side filtering unit. The tendency for an increase in pressure serves as an indicator of the contamination of the filtering unit and is measured by a pressure sensor. When a certain amount of pressure is reached, the filtering unit is rotated so that the number of holes 5 is compatible with the holes M and 3. With the help of the connection valve 12 forms a connection between the openings 5 and the outside space to such an extent that each individual opening is sequentially washed one after the other in countercurrent by creating a partial flow and the masses withdrawn from the channel I and the impurity inclusions collected in the openings 5 are removed to the external space. The rotation of the filtering unit is carried out discretely, with the result that each hole 5 is blocked by holes Ж and 3. Thus, all holes are subjected to a cleaning process. The filtration unit as well as the control valves 12 can be driven automatically depending on the mass pressure, whereby the cleaning process proceeds continuously. FIG. 3 shows a longitudinal section of a filtering device, which is another embodiment of the subject invention. The filter unit is installed perpendicular to the axis of body 1. Holes 5 are arranged in parallel rows on one segment that is bounded by the edges of channel G steaks. On the side of the filter unit X opposite to the holes 5 of the filter unit X there are reverse flow channels Ж, which are limited the edges 1N of the wall of the outlet channel I. In the case 1 near the channel D there are installed sealing strips 15 with openings 3 for communication with the external medium. Control valve 12 is installed separately with sealing strip 15. Another structural embodiment of sealing strip 15 is shown in FIG. 3 in its right side. A tubular control valve 12 is connected to the sealing strip 15, which has a channel a in the plug of the valve for the discharge of the ground current. The control valve 12 is clamped with a clamping screw 16 against the sealing strip 15. FIG. k is a section along the line B-B of FIG. 3. The ends of the filtering unit, which can be rotated in the housing 1, are formed on one side by the support part 17, and on the other side by the lid 18 fixed by means of a nut 19. The support part 17 is provided with a protrusion .0 to which the unbroken in the drawing, a driving device for communicating rotation to a filtering unit. The principle of operation of the device, as shown in FIG. 3 is similar to the method of operation of the device shown in FIG. 1. The difference consists only in the operation of turning the filtering unit, which, in accordance with the design of the device according to FIG. 3 should, depending on the circumstances, rotate 90 ° to the right or left from the quiescent state to the cleaning mode of the holes 5, as a result of which the holes 5 are successively blocked by the holes of the channel D and the primary filter 21 is also placed to delay large impurity particles. FIG. 5 shows a longitudinal section through another embodiment of the filtering device according to the invention. The filter unit is made in the form of a plate part and is installed perpendicular to the axis of the housing 1 so that it can rotate. Holes Ж are located on both sides of channel G parallel to its axis in housing 1. The equalizing valve 12 is located in the veins | Tilting unit 11, the openings 3 are connected with the external medium of which are connected to the openings W of the reverse flow. FIG. 5 in the upper half shows the constructive execution of the control valve in the form of a flat slide gate, and in the lower part of the drawing, in the form of a valve plug. On the reverse side of the filtering unit, there is a gate 22 with an abutment lip 23. The gateway 22 is designed to connect the outlet channel W with a series of holes 5 if the filter unit moves from a state of rest to the position for the cleaning process and the hole 5 overlaps G, FIG. 6 is a cross section along line B-B according to FIG. 5. Holes 5 are placed in parallel rows on the same segment, which by their size corresponds to the cross-sectional area of channel G. Valve block 11 with control valve 12 is connected to holes G in housing 1. Control valve is made according to the drawing in The form of a tap of a crane and has through holes b, the axes of which are displaced relative to each other by a corresponding (definite) angle, as a result of which only one hole 5 by means of holes 3 is permanently connected with the outer space. FIG. 7 shows the mastic cutout of the filtering unit according to FIG. 5. The segment of the holes 5 on the side rotated to the outlet channel I is provided with a reverse thrust surface 2 3a of estimates for such an implementation of the filtration unit, eliminating the need for application-. nor the gate valve 22 on the reverse side ({ultra. The principle of operation of the filtering device according to Fig. 5. is similar to the constructive options considered. Shown in Figs. 1 and 3. In order to clean the holes 5 of the filter unit, the latter moves from its rest position and hole 5 in series, one after the other, are aligned with the openings G. Through the appropriate installation of the control valve 12, the connection between the openings 5 and the outer space is established. The plastic mass of the Tenet from the outlet channel I is in countercurrent through the opening and 5 and contaminants are withdrawn outwardly.
    The proposed device, due to the presence of a valve block, made with holes for communication with the external environment and a valve, connecting each hole of the filter unit with a return flow channel, made in a series of parallel holes, coaxially the holes of the filter and valve block, allows improve the efficiency of the cleaning process and the reliability of the device.
    权利要求:
    Claims (2)
    [1]
    1. USSR author's certificate number 376255, cl. In, 29. F 3/06, 1971.
    [2]
    2. Kaplun Ya.B. Forming equipment extruders. M., Mechanical Engineering,
    1969, p. fig 28 (prototype).
    FagL
    17
    FIG. five
    in- in
    .2
    12
    uzJ
    类似技术:
    公开号 | 公开日 | 专利标题
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    同族专利:
    公开号 | 公开日
    DD102635A1|1973-12-20|
    DE2407663A1|1974-09-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    IT1109660B|1978-02-23|1985-12-23|Lavorazione Mat Plast|REFINEMENT FOR EXTRUSION OF SYNTHETIC FOAMS|
    DE2947673C2|1979-11-27|1982-06-16|Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover|Filter device for screw extruders processing thermoplastic molding compounds|
    GB2102691B|1981-08-05|1985-01-09|Cresta Tech|Rotary filter|
    DE3430992C2|1983-11-03|1985-11-21|Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover|Filter device|
    NL192607C|1983-11-03|1997-11-04|Berstorff Gmbh Masch Hermann|Screening device.|
    DE3419822C2|1984-05-26|1986-04-03|Werner & Pfleiderer, 7000 Stuttgart|Filter device for screw extruders|
    DE3902061C2|1989-01-25|1991-02-21|Gneuss Kunststofftechnik Gmbh, 4970 Bad Oeynhausen, De|
    AT509706B1|2010-07-05|2011-11-15|Erema|FILTRATION DEVICE FOR FLUIDE|
    CN102529063A|2012-01-16|2012-07-04|王敬达|Filtering device of high polymer material extruder|
    CN104029373B|2014-06-25|2018-04-06|魏正才|A kind of double-plate not draping filter|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DD169300A|DD102635A1|1973-03-08|1973-03-08|
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