GB2171636A - Pin-barrel extruder having adjustable pins - Google Patents

Pin-barrel extruder having adjustable pins Download PDF

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Publication number
GB2171636A
GB2171636A GB08530699A GB8530699A GB2171636A GB 2171636 A GB2171636 A GB 2171636A GB 08530699 A GB08530699 A GB 08530699A GB 8530699 A GB8530699 A GB 8530699A GB 2171636 A GB2171636 A GB 2171636A
Authority
GB
United Kingdom
Prior art keywords
barrel
pin
pins
extruder
piston rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08530699A
Other versions
GB2171636B (en
GB8530699D0 (en
Inventor
Klaus Bellmer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KraussMaffei Berstorff GmbH
Original Assignee
Hermann Berstorff Maschinenbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hermann Berstorff Maschinenbau GmbH filed Critical Hermann Berstorff Maschinenbau GmbH
Publication of GB8530699D0 publication Critical patent/GB8530699D0/en
Publication of GB2171636A publication Critical patent/GB2171636A/en
Application granted granted Critical
Publication of GB2171636B publication Critical patent/GB2171636B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/24—Extrusion presses; Dies therefor using screws or worms
    • B30B11/248—Means preventing the material from turning with the screw or returning towards the feed hopper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/68—Barrels or cylinders
    • B29C48/685—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads
    • B29C48/687—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads having projections with a short length in the barrel direction, e.g. pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

A pin-barrel extruder (1, 2, 4) used for processing rubber or thermoplastics materials or for the removing of water from liquid/solid mixtures has pin adjusting means (6). The adjustment means (6) comprises a plurality of hydraulic piston and cylinder arrangements, the cylinders being mounted on the external surface of the barrel (1) and each pin (4) forms a part of the piston rod of each arrangement. Each pin (4) may be integrally formed with, or detachably affixable to the piston rod with which it is associated. By so doing, the pins (4) are insertable into and retractable from the interior of the barrel (1) in a simple manner. If desired, check valves may be provided so as to make it possible to displace the piston rods individually, in groups or all simultaneously, thereby permitting the pins (4) to be moved into or out of the extrusion barrel (1) interior extremely quickly. <IMAGE>

Description

SPECIFICATION Pin-barrel extruder having adjustable pins Field of the invention The present invention relates to a pin-barrel extruder. More particularly, it relates to an extruder in which the pins are adjustable.
Background of the invention and prior art discussion Pin-barrel extruders are known and comprise a screw conveyor which is rotatable in the hollow interior of a barrel. Disposed along the length of the barrel and projecting radially into the hollow interior of the barrel are a plurality of pins. These pins project to adjacent the core of the screw, the flight or flights on the screw being discontinuous in the region of the pins.
It is desirable if the depth of penetration of the pins into the barrel is adjustable. Such an arrangement is disclosed in United States Patent Specification No. 4,178,104. In such arrangement the pins are screw-fitted in holding members and are nonrotatably connected thereto by means of lock nuts.
The holding fixtures are radially displaceable in guide members mounted on the extruder cylinder.
A gear member is used for adjustment purposes.
One face of the gear faces the holding fixture and is provided with a cam track. The track engages corresponding complementary cam-followers on the holding fixtures. The gear member is driven by a pinion, is freely rotatable and is prevented from axial movement by a collar ring.
However, such an arrangement suffers from numerous disadvantages. In setting up such an arrangement, the gear member must firstly be positioned over the extruder barrel. In its end position, it then has to be mounted on a sleeve-like guide means which, in turn, has to be screw-connected to the extruder barrel. Finally, complementary cams and cam tracks have to be provided laterally on the gear member and in the holding fixtures. This is time-consuming and costly.
In addition, an extremely elaborate construction is also required, for the mounting of the drive pinion which engages with the gear on the extruder cylinder. This adds to the costs associated with the production of an extruder having such an adjustment arrangement.
It is also difficult to assemble the adjusting means. Before a barrel flange connecting member, which is usually provided to permit barrel portions to be connected together, is welded to one end of a barrel portion, it is necessary for the sleeve-like guide member to be slid onto the barrel so as to receive the bearings for the gear. The gear is then positioned over the cylinder and brought into its intended position. Only after this has been done can the guide member be screw-connected to the extruder barrel. The holding fixture, which is provided with the lateral cam followers, is then slid onto the extruder barrel into its intended position.
The individual pins are screwed radially inwardly through the holding fixture. Only when the assembly of all of these integers has been completed, can the barrel flange be welded to the end of the barrel portion.
After a period of time, it is likely that the cam followers on the holding fixture and the cam track on the gear member will exhibit signs of wean To replace them, the above-described procedure must be reversed. So much work is involved that it is simpler to replace the entire barrel portion. Moreover, it is also necessary to extract the screw from the extruder, and to remove the barrel flange connection. These measures which need to be taken mean that the extruder is inoperative for long, and therefore costly, periods of time.
Objects of the present invention It is an object of the present invention to provide a pin-barrel extruder in which the pins are adjustable but in which adjusting means are of a very simple construction and require little assembly and dismantling. In particular, it is an object of the present invention to avoid the necessity for extracting the screw of the extruder and for disconnecting, by removing the weld, the flanges of individual barrel portions when it is desired to change or replace the means for adjusting the pins.
Summary of the invention According to the present invention, there is provided a pin-barrel extruder suitable for processing rubber or thermoplastics materials, comprising a hollow cylindrical barrel, a screw rotatable in the interior of the barrel, the screw comprising a core portion and at least one flight portion helically disposed therearound, the at least one flight portion being discontinuous, the barrel having radially directed throughbores formed therethrough, which throughbores are distributed around the periphery of the barrel at substantially uniform intervals, pins being located in the throughbores, which pins are directed radially inwardly towards the longitudinal axis of the core of the screw such that the one end of each pin lies adjacent the core of the barrel in one of the discontinuous portions of the at least one flight, and adjusting devices for adjusting the depth of penetration of the pins into the barrel means, wherein the adjusting devices comprise hydraulic piston-and-cylinder arrangements, each arrangement comprising a cylinder mounted on the outer surface of the barrel and a piston rod slidable therein, each pin forming an end portion of its associated piston rod.
By making the pins form part of the piston rods, an extremely simple and effective arrangement is achieved for adjusting the pins. The depth of penetration of the pins into the hollow interior of the barrel may be varied simply by moving the respective piston rods in the individual hydraulic cylinders either radially inwardly or radially outwardly.
The piston rods in the hydraulic piston and cylinder arrangements mounted on the extruder barrel may be moved simultaneously or merely all of the pins in a particular radial plane or in a particular extruder barrel portion may be moved simultaneously, or even individual piston rods may be moved. This permits a highly individual adaptation to the specific temperature requirements or viscosities of the materials being treated can be achieved within the barrel portions.
Moreover, even if the screw needs to be extracted for cleaning or any other purpose, the pins can be extracted from the extrusion chamber extremely quickly, so that the screw can be extracted easily.
Preferably, each pin member is detachably affixed to its associated piston rod. Alternatively, each pin member may be integrally formed with its associated piston rod.
Advantageously, the end of each piston rod remote from the pin projects from the cylinder in a radially outward direction, the projecting portion carrying indicia means.
Brief description of the drawings One embodiment of a pin-barrel extruder in accordance with the present invention will be further described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a longitudinal sectional view through a portion of a pin barrel extruder in accordance with the present invention; and Figure 2 is a cross-sectional view taken along the line Il-Il of Figure 1.
Description of preferred embodiments In Figure 1, there is shown a pin-barrel extruder in which, in a conventional manner, a screw 2 rotates in an extruder barrel portion 1. Material to be extruded such as rubber or thermoplastics material are fed into the barrel 1 and are conveyed therealong by means of one or more helically extending flights 3 provided around the periphery of the screw 2. Pin members 4 provided along the length of the barrel portion 1 and project radially inwardly into the interior 5 of the barrel portion 1. The flight 3 are discontinuous in the regions where the pins 4 project into the interior 5 of the barrel portion 1.
To permit adjustment of the pins 4, hydraulic piston and cylinder arrangements 6 are mounted on the exterior surface of the barrel portion 1.
These arrangements are so designed that each pin is integrally formed with, or is affixable to, a respective one of the piston rods of the piston and cylinder arrangements.
The hydraulic piston and cylinder arrangements 6 are controlled by means of one or more check valves (not shown). Depending upon the intended purpose of the apparatus, the piston and cylinder arrangements may be controlled in groups or all together.
By simply operating such a check valve or valves, it is therefore possible to move the pins 4 into and out of the interior 5 of the barrel portion in a matter of seconds. Accordingly, the apparatus can rapidly be adapted to cope with the viscosity and/or temperature sensitivity of almost any material requiring extrusion.
The piston rods of the hydraulic cylinders may be continuous so that one end thereof forms one of the homogenising pins 4 and the other ends, which projects from the hydraulic cylinder, can also serve as a visible control means if it is provided with appropriate markings because it de notes the depth of penetration of the pin end 4 into the interior 5 of the barrel portion 1.
Alternatively, the pins 4 may be separate integers which are screw-threadedly affixed into the piston rods of the hydraulic cylinders. Accordingly, ~if wear phenomena appear on the pins 4, it is pos sible to replace the pins 4 in an economic and rapid manner.

Claims (5)

1. A pin-barrel extruder suitable for processing rubber or thermoplastics materials, comprising a hollow cylindrical barrel, a screw rotatable in the interior of the barrel, the screw comprising a core portion and at least one flight portion helically dis posed therearound, the at least one flight portion being discontinuous, the barrel having radially di rected throughbores formed therethrough, which throughbores are distributed around the periphery of the barrel at substantially uniform intervals, pins being located in the throughbores, which pins are directed radially inwardly towards the longitudinal axis of the core of the screw such that one end of each pin lies adjacent the core of the barrel in one of the discontinuous portions of the at least one flight, and adjusting devices for adjusting the depth of penetration of the pins into the barrel means, wherein the adjusting devices comprise hydraulic piston-and-cylinder arrangements, each ar rangement comprising a cylinder mounted on the outer surface of the barrel and a piston rod slida ble therein, each pin forming an end portion of its associated piston rod.
2. A pin-barrel extruder as claimed in claim 1, wherein the pin member is detachably affixed to its associated piston rod.
3. A pin-barrel extruder as claimed in claim 1, wherein each pin member is integrally formed with its associated piston rod.
4. A pin-barrel extruder as claimed in claim 1, wherein the end of each piston rod remote from the pin projects from the cylinder in a radially outward direction, the projecting portion carrying indi cia means.
5. A pin-barrel extruder as claimed in claim 1 substantially as hereinbefore described with refer ence to the accompanying drawings.
GB08530699A 1985-02-06 1985-12-13 Pin-barrel extruder having adjustable pins Expired GB2171636B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3503911A DE3503911C1 (en) 1985-02-06 1985-02-06 Pen adjustment device on a pen extruder for the processing of rubber or thermoplastic materials

Publications (3)

Publication Number Publication Date
GB8530699D0 GB8530699D0 (en) 1986-01-22
GB2171636A true GB2171636A (en) 1986-09-03
GB2171636B GB2171636B (en) 1988-12-14

Family

ID=6261736

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08530699A Expired GB2171636B (en) 1985-02-06 1985-12-13 Pin-barrel extruder having adjustable pins

Country Status (10)

Country Link
JP (1) JPH0655410B2 (en)
CN (1) CN1003436B (en)
AT (1) AT389672B (en)
CA (1) CA1282215C (en)
DE (1) DE3503911C1 (en)
FR (1) FR2576833B1 (en)
GB (1) GB2171636B (en)
IT (1) IT1204763B (en)
SE (1) SE8600500L (en)
SU (1) SU1393312A3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5190771A (en) * 1990-04-20 1993-03-02 Kraftanlagen Ag Screw extruder

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0305692B1 (en) * 1987-09-02 1992-05-06 HERMANN BERSTORFF Maschinenbau GmbH Process for the continuous production of rubber mixtures and other filler-containing polymer-based mixtures
FR2648261B1 (en) * 1989-06-07 1992-04-17 Mecanique Moderne MONOVIS CONTINUOUS PRESS WITH ADAPTABLE COMPRESSION RATE
DE4010540C1 (en) * 1990-04-02 1991-11-07 Wilfried Dipl.-Ing. 3017 Pattensen De Baumgarten
DE4208284C1 (en) * 1992-03-13 1993-02-11 Paul Troester Maschinenfabrik, 3000 Hannover, De
DE4244312C1 (en) * 1992-12-28 1994-01-20 Baumgarten Wilfried Screw extruder
CN109732804B (en) * 2019-01-25 2020-05-08 维希艾环保新材料(上海)股份有限公司 High-dispersity extrusion equipment for producing environment-friendly antirust master batches
DE102020214857A1 (en) 2020-11-26 2022-06-02 Continental Reifen Deutschland Gmbh Apparatus for extruding a rubber compound having a Mooney viscosity greater than 50 MU and using the apparatus to extrude a first rubber compound into a second rubber compound and to extrude a third rubber compound into a fourth rubber compound

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2124466B2 (en) * 1971-05-17 1978-09-28 Fried. Krupp Gmbh, 4300 Essen Extruder for processing plastics and elastomers
US4178104A (en) * 1972-07-21 1979-12-11 Uniroyal, Ag Method and apparatus for mixing viscous materials
JPS5249267A (en) * 1975-10-17 1977-04-20 Japan Steel Works Ltd Degassing modifying extruder
DE2758266C2 (en) * 1977-12-27 1982-11-25 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Device for regulating the throughput of a single or twin screw extruder connected to a polymerisation system
JPS55139825A (en) * 1979-03-29 1980-11-01 Kobe Steel Ltd Continuous type kneader
DE2931387A1 (en) * 1979-08-02 1981-02-05 Continental Gummi Werke Ag Extrusion press for plastomers and elastomers - has radial kneading pins inserted in solid bridges across cooling jacket
DE3407789A1 (en) * 1983-03-18 1984-10-25 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Screw extruder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5190771A (en) * 1990-04-20 1993-03-02 Kraftanlagen Ag Screw extruder

Also Published As

Publication number Publication date
IT1204763B (en) 1989-03-10
JPH0655410B2 (en) 1994-07-27
GB2171636B (en) 1988-12-14
CN85109401A (en) 1987-03-04
SE8600500D0 (en) 1986-02-04
CN1003436B (en) 1989-03-01
DE3503911C1 (en) 1986-09-04
CA1282215C (en) 1991-04-02
IT8619107A0 (en) 1986-01-17
AT389672B (en) 1990-01-10
FR2576833A1 (en) 1986-08-08
SE8600500L (en) 1986-08-07
ATA9886A (en) 1989-06-15
SU1393312A3 (en) 1988-04-30
FR2576833B1 (en) 1989-03-24
JPS61182922A (en) 1986-08-15
GB8530699D0 (en) 1986-01-22

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20051212