CN110539469B

CN110539469B - Combined type extruder barrel and assembling method thereof

Info

Publication number: CN110539469B
Application number: CN201910825134.XA
Authority: CN
Inventors: 张益�
Original assignee: Leistritz Machinery Taicang Co ltd
Current assignee: Leistritz Machinery Taicang Co ltd
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2021-11-05
Anticipated expiration: 2039-09-03
Also published as: CN110539469A

Abstract

The invention discloses a combined type extruder barrel and an assembling method thereof. The barrel facilitates replacement of worn inner liners in individual barrel units during use. The assembling method can ensure that all the machine barrel units keep consistent in size and have high coaxiality, material leakage among the machine barrel units can be avoided after assembling, step surfaces can be avoided among the machine barrel units, and normal operation and finished product quality of the extruder are guaranteed. In addition, the insert structure of the machine barrel is easy to replace after being worn and can be disassembled according to different working conditions, so that auxiliary mechanisms such as an exhaust mechanism and a side feeding mechanism are assembled on the machine barrel of the extruder, the quality of a processed product is improved, and the use flexibility of the machine barrel is improved.

Description

Combined type extruder barrel and assembling method thereof

Technical Field

The invention relates to the field of extruders, in particular to a combined extruder barrel and an assembling method thereof.

Background

The barrels of extruders are generally divided into monolithic and combined types, in which:

the barrel structure of the integral cylinder is an integral structure, the screw lining structure of the integral cylinder is also an integral structure or an integral structure with the inner wall of the cylinder, but no matter which structure is adopted by the lining, once the lining is worn in the using process, the lining and even the cylinder need to be replaced integrally.

The combined machine barrel is formed by sequentially matching a plurality of sections of barrels, and has the advantages that the single-section seriously worn barrel or lining can be independently replaced, and the maintenance cost is saved. However, in order to facilitate assembly, the barrel and the inner liner of the combined barrel in the prior art are generally in transition or even clearance fit, and are fixed by screws, that is, after the barrel is integrally assembled, coaxiality between multiple sections of inner liners is hardly ensured, and a step surface is formed between adjacent barrels, which affects the quality of extruded products of the extruder, and even barrel leakage occurs because adjacent inner liners cannot be tightly coupled.

Therefore, the above problems need to be solved.

Disclosure of Invention

In order to overcome the defects in the prior art, the embodiment of the invention provides a combined extruder barrel and an assembling method thereof, which are used for solving the problems that the combined extruder barrel in the prior art is poor in assembling effect, easy to leak materials and affect the quality of a finished product.

The embodiment of the application discloses: a modular extruder barrel formed by sequential connection of a plurality of barrel units, said barrel units comprising:

an outer cylinder;

the inner bushing is made of a metal material and can be sleeved in the outer barrel and is in interference fit with the outer barrel;

the outer barrel has at least one first end surface;

the inner bushing is provided with a second end face which is positioned at the same end as the first end face;

the first end face and the second end face are in a flush state by cutting or grinding after the inner bushing is sleeved on the outer barrel.

Furthermore, both ends of the outer cylinder are also provided with positioning parts which are used for matching with the outer cylinder of the adjacent cylinder unit so as to enable the two cylinder units to be coaxial.

Further, the outer wall of the outer cylinder is provided with at least one first notch communicated to the inner cavity of the outer cylinder; the outer wall of the inner bushing is provided with a second notch portion which can correspond to the first notch portion when the outer barrel and the inner bushing are integrated, the combined extruder barrel further comprises a plurality of embedded blocks, all the embedded blocks are detachably connected to the first notch portion and block the second notch portion, so that all the embedded blocks and the inner wall of the inner bushing jointly form a working chamber of an extruder screw, and all the embedded blocks are used for forming the end face of the working chamber and the surface of the inner wall of the inner bushing are smoothly connected.

Further, the insert is made of a wear and/or corrosion resistant metal material.

Further, the metal material includes a cobalt-based alloy, a nickel-based alloy, a chromium-based alloy, a manganese-based alloy, and/or a tungsten-based alloy.

Furthermore, the positioning part comprises flanges arranged at two ends of the outer barrel, and pin holes are formed in the flanges.

Further, a first notch part communicated to the inner cavity of the outer cylinder is formed on the outer wall of the outer cylinder; the outer wall of the inner bushing is provided with a second notch part which can correspond to the first notch part when the outer bushing and the inner bushing are integrated, the combined extruder cylinder further comprises a side feeding mechanism, and the side feeding mechanism blocks the first notch part and is communicated with a working chamber used for accommodating an extruder screw in the inner bushing sequentially through the first notch part and the second notch part.

Furthermore, a first notch part communicated to the inner cavity of the outer cylinder is formed on the outer wall of the top of the outer cylinder; the outer wall of the inner bushing is provided with a second notch portion which can correspond to the first notch portion when the outer bushing and the inner bushing are integrated, the combined extruder barrel further comprises an exhaust mechanism, and the exhaust mechanism blocks the first notch portion and is communicated with a working chamber used for accommodating an extruder screw in the inner bushing sequentially through the first notch portion and the second notch portion.

Further, the working mode of the exhaust mechanism comprises forced exhaust or natural exhaust.

The embodiment of the application also discloses: a method of assembling a barrel of a modular extruder comprising the steps of:

heating an outer cylinder of the combined extruder barrel, and then placing an inner lining sleeve in an inner cavity of the outer cylinder to enable the outer cylinder and the inner lining sleeve to be in interference fit so as to obtain a semi-finished product of the barrel unit;

cutting or grinding two end parts of the semi-finished product of the machine barrel unit to enable the outer cylinder and the inner bushing of the semi-finished product of the machine barrel unit to reach a preset size, and enabling two ends of the outer cylinder and the inner bushing to be flush to obtain the machine barrel unit;

and sequentially matching the positioning parts of the plurality of barrel units so as to enable all the barrel units to be coaxial.

The invention has the following beneficial effects:

1. the combined type extruder barrel provided by the invention consists of a plurality of barrel units, each barrel unit consists of the outer barrel and the inner bushing which are in interference fit, and the worn inner bushing in a single barrel unit is convenient to replace in the using process.

2. According to the assembling method of the combined type extruder barrel, after the outer barrel and the inner bushing are assembled, the two ends of the barrel units are cut or ground, the size of the outer barrel and the size of the inner bushing reach the preset size, the end faces of the outer barrel and the inner bushing are flush, all the barrel units can keep consistent size and high coaxiality, material leakage cannot occur among the barrel units after assembly, step surfaces cannot exist among the barrel units, and normal operation and finished product quality of the extruder are guaranteed.

3. The embedded block structure arranged on the combined extruder barrel provided by the invention is easy to replace, so that a vulnerable part and a non-vulnerable part of the barrel can be reasonably distinguished according to different extruder structures and processing media, and further, a vulnerable part of an inner cavity of the barrel, which is in contact with the processing media, can be directly replaced from the outside of the outer barrel, and the maintenance time cost is saved.

4. According to the combined type extruder barrel provided by the invention, the set insert block structure can be disassembled according to different working conditions, so that auxiliary mechanisms such as an exhaust mechanism and a side feeding mechanism are assembled on the extruder barrel, the quality of processed products is improved, and the use flexibility of the barrel is improved.

In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the structure of a barrel unit in an embodiment of the invention;

FIG. 2 is an exploded view of the barrel unit in an embodiment of the present invention;

FIG. 3 is a schematic sectional view taken along line A-A of FIG. 1;

FIG. 4 is a schematic view showing an assembly structure of a barrel unit and a side feeding mechanism in example 1 of the present invention;

reference numerals of the above figures:

100. a barrel unit; 200. a side feeding mechanism;

1. an outer cylinder; 2. an inner liner; 3. a flange; 4. 4a, 4b, an insert; 5. a side feed liner; 6. a first substrate; 7. a second substrate;

10. a first notch portion; 20. a second notch portion.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present embodiment provides a combined extruder barrel, which is formed by connecting a plurality of barrel units 100 shown in fig. 1, fig. 2 and fig. 3 in sequence, wherein the barrel units 100 comprise:

an outer cylinder 1;

the inner bushing 2 is made of a metal material, and the inner bushing 2 can be sleeved in the outer barrel 1 and is in interference fit with the outer barrel 1;

the outer cylinder 1 has at least one first end surface;

the inner bushing 2 is provided with a second end face which is positioned at the same end as the first end face;

the first end face and the second end face are in a flush state by cutting or grinding after the inner bushing 2 is sleeved on the outer cylinder 1.

By means of the above mechanism, the barrel unit 100 is roughly divided into the outer barrel 1 and the inner bush 2, which are tightly and fixedly connected in an interference fit manner after assembly, and the outer barrel 1 and the inner bush 2 which can be regarded as an integral structure are cut or ground at two ends (the two ends respectively include the first end surface of the outer barrel 1 and the second end surface of the inner bush 2 which are located at the same side of the barrel unit 100) after assembly, so that the side sizes of the outer barrel 1 and the inner bush 2 reach the preset size, and the end surfaces are flush. Therefore, all the barrel units 100 can keep consistent in size and high in coaxiality, material leakage among the barrel units 100 after assembly can be avoided, step surfaces can be avoided among the barrel units 100, and normal operation and finished product quality of the extruder are guaranteed.

It is understood that the length of the outer sleeve 1 and the inner bush 2, which are not assembled, is longer than the design size, i.e., one end or both ends of the outer sleeve 1 and the inner bush 2 have a machining allowance. Preferably, the forming size of the inner bush 2 (i.e. the size which is not cut or ground before assembly) is designed to be slightly larger than the forming size of the outer cylinder 1, so that both ends of the inner bush 2 can be conveniently extended out of both ends of the outer cylinder 1 during assembly, and thus, both ends of the outer cylinder 1 and the inner bush 2 can be kept flush after both ends of the assembled outer cylinder 1 and inner bush 2 are cut or ground.

For different processing media, since the inner liner 2 is a wear-prone part, the inner liner 2 may be made of a wear-resistant or corrosion-resistant material or a material that is both wear-resistant and corrosion-resistant, such as a cobalt-based alloy, a nickel-based alloy, a chromium-based alloy, a manganese-based alloy, and/or a tungsten-based alloy. And, when wearing and tearing to a certain degree, because the structure of dividing between interior bush 2 and urceolus 1, can pass through the press and force the extrusion of interior bush 2, change into the new bush. Preferably, both ends of the outer cylinder 1 are further provided with positioning parts for mating with the outer cylinder 1 of the barrel unit 100 adjacent thereto so as to make the two barrel units 100 coaxial. For example, the positioning portion may include flanges 3 provided at both ends of the outer cylinder 1, and pin holes are provided in the flanges 3, and pin holes of two or more adjacent cylinder units 100 are fixed by pins or tie rods, so that all the cylinder units 100 may be coaxial.

Specifically, the assembling method of the combined extruder cylinder can comprise the following steps:

firstly, after an outer cylinder 1 of a machine barrel of the combined extruder is heated, an inner bushing 2 is arranged in an inner cavity of the outer cylinder 1, and the outer cylinder 1 and the inner bushing 2 are in interference fit to obtain a semi-finished product of the machine barrel unit 100. The heated outer tube 1 expands to increase the inner diameter thereof, and the inner liner 2 can be smoothly inserted. As mentioned above, the length of the inner liner 2 should be slightly greater than the length of the outer cylinder 1, and in this step, both ends of the inner liner 2 should protrude out of the outer cylinder 1, or one end of the inner liner is flush with the end surface of the outer cylinder 1 and the other end of the inner liner protrudes out of the outer cylinder 1. Preferably, before assembly, the inner bushing 2 may be hardened, or a high-hardness material may be directly selected, and the hardness of the inner bushing 2 is higher than that of the outer sleeve 1 which is not hardened, so that during assembly, scratches are not easily generated between the outer sleeve 1 and the inner bushing 2 which have large differences in hardness and properties.

Subsequently, after the semi-finished product of the standby cylinder unit 100 is cooled to form an interference fit, the two end portions of the semi-finished product of the cylinder unit 100 are cut or ground to make the outer cylinder 1 and the inner bushing 2 of the semi-finished product of the cylinder unit 100 reach a preset size, and the two ends of the outer cylinder 1 and the inner bushing 2 are flush to obtain the cylinder unit 100. In this step, the cutting or grinding process of the semifinished product of the barrel unit 100 may be performed by milling or grinding or the like.

Finally, the positioning parts of the plurality of barrel units 100 are sequentially coupled, so that all the barrel units 100 are coaxial, and the combined extruder barrel is obtained.

In a preferred embodiment, the outer wall of the outer cylinder 1 is formed with at least one first notch portion 10 communicated to the inner cavity thereof; the outer wall of the inner bush 2 is provided with a second notch portion 20 which corresponds to the first notch portion 10 when the outer barrel 1 and the inner bush 2 are sleeved into a whole, the combined extruder barrel further comprises a plurality of embedded blocks 4, all the embedded blocks 4 are detachably connected to the first notch portion 10 and block the second notch portion 20, so that all the embedded blocks 4 and the inner wall of the inner bush 2 jointly form a working chamber of an extruder screw, and all the embedded blocks 4 are used for forming the end face of the working chamber and are smoothly connected with the surface of the inner wall of the inner bush 2. The above structure can further make the extruder cylinder easy to replace the wear parts, specifically, the position of the second notch portion 20 can be set for the easy-to-wear part of the neck bush, so that the insert 4 which seals the second notch portion 20 from the first notch portion 10 can be directly replaced from the outside of the outer cylinder 1 after being worn, and the maintenance time and cost are saved. Likewise, the insert 4 is also made of a wear-resistant and/or corrosion-resistant metal material. The embedded block 4 can be a plurality of blocks and is fixedly connected onto the outer barrel 1 through a fixing piece.

In other preferred embodiments, the following specific design of the insert 4 and the fixture for fixing the insert 4 can be used to provide the barrel of the modular extruder with better functionality and more flexibility, for example:

case 1:

referring to fig. 4, the structure of the barrel unit in the above preferred embodiment may be provided with a side feeding mechanism 200 for feeding the processing material or pigment into the interior of the barrel. Specifically, the first notch portion 10 is formed at least on the side wall of the outer cylinder 1, that is, the second notch portion 20 is provided at the side of the inner liner 2 corresponding to the first notch portion 10. A side feeding bush 5 having the above-mentioned fixing function is fixed to the outer cylinder 1 and extends into the first notched portion 10, so that the cylinder can be attached with the side feeding mechanism 200 through the side feeding bush 5, and the screw of the side feeding mechanism 200 can be fed through the inner cavity of the side feeding bush 5 and the second notched portion 20 to communicate with the inner cavity of the cylinder unit 100.

When the side feeding mechanism 200 is not required to be attached, the first notch portion 10 is blocked by inserting the insert 4a adapted to the inner cavity of the side feeding bush 5 into the side feeding bush 5, and specifically, as described above, the end surface of the insert 4a corresponding to the inner cavity of the inner liner 2 is smoothly connected with the inner wall surface of the inner liner 2 to form the working chamber.

The insert 4a for blocking the first notch portion 10 may be one or more, for example, the insert 4a may be a cylindrical body having a diameter slightly larger than the outer diameter of the single screw of the side feeding mechanism 200, and the insert 4a may also be two cylindrical bodies capable of being spliced into an "8" shape to fit with the double screws of the side feeding mechanism 200. It can be fixed to the outer cylinder 1 by another first base plate 6 as a fixing element and arranged outside the cylinder.

Case 2:

the structure of the barrel unit in the above preferred embodiment may be attached with a gas discharge mechanism for discharging gas generated in the operation inside the barrel. Specifically, the first notch portion 10 is formed at least on the outer wall of the top portion of the outer cylinder 1, that is, the second notch portion 20 is provided at the side portion of the inner bush 2 corresponding to the first notch portion 10. And the exhaust mechanism is fixedly connected with the outer barrel 1 and is communicated with the first notch part 10, so that the exhaust mechanism is communicated with the inner cavity of the machine barrel unit through the second notch part 20 to exhaust the air of the machine barrel unit. Specifically, the operation mode of the exhaust mechanism may include forced exhaust or natural exhaust.

When the exhaust mechanism is not required to be attached, the first notch portion 10 and the second notch portion 20 are sealed by an insert 4 fitted to the first notch portion 10 and the second notch portion, and specifically, as described above, the end face of the insert 4b corresponding to the inner cavity of the inner liner 2 is also smoothly connected to the inner wall surface of the inner liner 2 to form the working chamber.

The insert 4b for closing the first notch portion 10 may be one or more. It can be fixed to the outer cylinder 1 by means of a second base plate 7, which acts as a fixing element and is arranged outside the cylinder.

It should be noted that the side feeding mechanism 200 and the air discharging mechanism in case 1 and case 2 can be alternatively or simultaneously mounted on the outer cylinder 1. The insert blocks 4a/4b and the first base plate 6 and the second base plate 7 as fixing parts, and the first base plate 6 and the second base plate 7 as fixing parts and the outer barrel 1 can be in transition fit, so that the arrangement can be adjusted/replaced at any time in the production process. And the side feeding lining 5 is a wearing part contacted with the processing medium, and can be made of wear-resistant and/or corrosion-resistant materials. The first substrate 6 and the second substrate 7 are not in contact with the processing medium, and a common steel material can be selected. Such as above-mentioned, rationally distinguish vulnerable part and non-vulnerable part to adopt difference and cooperation to different operating modes, can promote the quality of processing product, promote the flexibility of use of this barrel.

The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A modular extruder barrel is formed by connecting a plurality of barrel units in turn, characterized in that the barrel units include:

an outer cylinder;

the outer barrel has at least one first end surface;

the first end face and the second end face are in a flush state by cutting or grinding after the inner bushing is sleeved on the outer cylinder;

wherein, the outer wall of the outer cylinder is provided with at least one first gap part communicated to the inner cavity of the outer cylinder; the outer wall of the inner lining sleeve is provided with a second gap part which corresponds to the first gap part when the outer cylinder and the inner lining sleeve are integrated, and the combined extruder cylinder further comprises a plurality of embedded blocks and/or a side feeding mechanism or an exhaust mechanism;

all the inserts can be detachably connected to the first notch parts and block the second notch parts, so that all the inserts and the inner wall of the inner bushing jointly form a working chamber of the screw rod of the extruder, and the end face of each insert, which is used for forming the working chamber, is smoothly connected with the surface of the inner wall of the inner bushing;

the side feeding mechanism is communicated with the inner bushing through a side feeding bushing, the side feeding bushing is fixed on the outer barrel and extends into the first notch part, a screw of the side feeding mechanism can be communicated with an inner cavity of the barrel unit through an inner cavity of the side feeding bushing and the second notch part, and one insert block can be inserted into the inner bushing to block the first notch part;

the exhaust mechanism blocks the first notch portion and is communicated with a working chamber used for accommodating an extruder screw in the inner liner sequentially through the first notch portion and the second notch portion.

2. The barrel of a combination extruder of claim 1, wherein the outer barrel further has locating portions at both ends for mating with the outer barrel of a barrel unit adjacent thereto to make the two barrel units coaxial.

3. The modular extruder barrel of claim 1 wherein the insert is made of a wear and/or corrosion resistant metallic material.

4. The combined extruder barrel of claim 3, wherein the metallic material comprises a cobalt-based alloy, a nickel-based alloy, a chromium-based alloy, a manganese-based alloy, and/or a tungsten-based alloy.

5. The barrel of a combination extruder of claim 2, wherein the locating portion comprises flanges provided at both ends of the outer barrel, the flanges having pin holes provided thereon.

6. The modular extruder barrel of claim 1 wherein the venting mechanism operates in a manner that includes forced venting or natural venting.