Extruder barrel and extruder

Abstract

The utility model provides an extruder barrel and an extruder, which belong to the technical field of extruders, and comprise an outer barrel and an inner barrel which are mutually nested and matched, the lining is provided with a wear-resistant layer and is embedded in the inner cylinder, the outer side wall of the lining is tightly attached to the inner side wall of the inner cylinder, seamless attachment is formed between the lining and the inner cylinder, the lining at least comprises two arc-shaped wear-resistant sleeves, and the columnar lining with the side face arranged in a closed mode is formed by splicing the two arc-shaped wear-resistant sleeves. According to the utility model, the bushing with the alloy wear-resistant layer is spliced in a split manner, so that the worn bushing can be repaired again by spraying the alloy layer, the bushing can be continuously used, and the cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of extruders and relates to an extruder barrel and an extruder. Background Art

[0002] Extruders are a type of plastics machinery that originated in the 18th century. Extruder heads can be categorized as either right-angle or bevel-angle, depending on the direction of material flow and the angle between the screw centerline. Screw extruders rely on the pressure and shear forces generated by the screw's rotation to fully plasticize and evenly mix the material before forming it through the die. Plastic extruders can be broadly categorized as twin-screw extruders, single-screw extruders, and the less common multi-screw and screwless extruders.

[0003] Chinese patent (CN217226594U) discloses an improved twin-screw extruder barrel structure, including a barrel body, wherein the barrel body includes an outer barrel and an inner barrel, wherein the outer barrel and the inner barrel each include an upper semi-cylinder and a lower semi-cylinder, wherein the upper semi-cylinder and the lower semi-cylinder are detachably connected, and the side wall of the inner barrel is sequentially provided with a heat-conducting layer and an alloy wear-resistant layer along the axial direction.

[0004] The alloy wear-resistant layer described above is integrally arranged on the side wall of the inner cylinder. After the cylinder is used for a long time, the thickness of the alloy wear-resistant layer will be worn away. At this time, the alloy wear-resistant layer needs to be replaced. However, if the alloy wear-resistant layer is replaced as a whole, the price is relatively expensive, and the integrally arranged alloy wear-resistant layer is not easy to remove from the side wall of the inner cylinder, which is not conducive to its replacement. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems in the existing technology and to propose an extruder barrel which is convenient for replacing the alloy wear-resistant layer.

[0006] The purpose of the utility model can be achieved through the following technical solutions: an extruder barrel, comprising:

[0007] The outer cylinder and the inner cylinder are nested with each other;

[0008] A bushing with an alloy wear-resistant layer is nested in an inner tube, and the outer wall of the bushing is tightly attached to the inner wall of the inner tube, so that a seamless fit is formed between the two. The bushing includes at least two arc-shaped wear-resistant sleeves, and a columnar bushing with a closed side is formed by splicing the two arc-shaped wear-resistant sleeves.

[0009] In the above-mentioned extruder barrel, a positioning structure is provided between any two adjacent arc-shaped wear-resistant sleeves, and the relative sliding of the two adjacent arc-shaped wear-resistant sleeves in the radial direction is limited by the positioning structure.

[0010] In the above-mentioned extruder barrel, the positioning structure between any two adjacent arc-shaped wear-resistant sleeves realizes seamless splicing between the two through concave-convex matching, wherein, when the two adjacent arc-shaped wear-resistant sleeves are matched in concave-convex manner, the connection direction between the two moves relatively along the axial direction of the arc-shaped wear-resistant sleeve.

[0011] In the above-mentioned extruder barrel, when two adjacent arc-shaped wear-resistant sleeves are matched in concave and convex configuration, one of the two arc-shaped wear-resistant sleeves is provided with a convex portion and / or a concave portion, and the other arc-shaped wear-resistant sleeve is provided with a corresponding concave portion and / or convex portion.

[0012] In the above-mentioned extruder barrel, the convex part or the concave part is arranged on the end faces on both sides of the opening end of the arc-shaped wear-resistant sleeve, wherein the convex part protrudes from the end faces on both sides of the opening end of the arc-shaped wear-resistant sleeve, and the concave part is recessed downward along the end faces on both sides of the opening end of the arc-shaped wear-resistant sleeve.

[0013] In the above-mentioned extruder barrel, the two ends of the convex portion are flush with the two ends of the corresponding arc-shaped wear-resistant sleeve along the axial direction, and the two ends of the concave portion are flush with the two ends of the corresponding arc-shaped wear-resistant sleeve along the axial direction, wherein the convex portion or the concave portion is integrally arranged with the corresponding arc-shaped wear-resistant sleeve.

[0014] In the above-mentioned extruder barrel, when the number of arc-shaped wear-resistant sleeves is two, convex portions are provided on both side end faces of the open end of one of the arc-shaped wear-resistant sleeves, and concave portions are provided on both side end faces of the open end of the other arc-shaped wear-resistant sleeve, or, convex portions and concave portions are respectively provided on both side end faces of the open end of each arc-shaped wear-resistant sleeve.

[0015] In the above-mentioned extruder barrel, when there are multiple arc-shaped wear-resistant sleeves, convex portions and concave portions are respectively provided on the end faces on both sides of the opening end of each arc-shaped wear-resistant sleeve, or convex portions and concave portions are respectively provided on the end faces on both sides of the opening end of at least one arc-shaped wear-resistant sleeve, and convex portions are provided on the end faces on both sides of the opening end of the remaining arc-shaped wear-resistant sleeves, or concave portions are provided.

[0016] In the above-mentioned extruder barrel, the convex portion is a long strip convex block, and the two ends of the long strip convex block are respectively flush with the two ends of the corresponding arc-shaped wear-resistant sleeve along the axial direction; or the convex portion includes multiple short strip convex portions, and one end of the short strip convex block close to the two ends of the corresponding arc-shaped wear-resistant sleeve along the axial direction is flush with the end surface of the arc-shaped wear-resistant sleeve.

[0017] In the above-mentioned extruder barrel, when the convex portion includes a plurality of short strip-shaped protrusions, the plurality of short strip-shaped protrusions are located on the same straight line, or two adjacent short strip-shaped protrusions are staggered.

[0018] In the above-mentioned extruder barrel, the recess is a long strip groove, and both ends of the long strip groove are flush with the two ends of the corresponding arc-shaped wear-resistant sleeve along the axial direction, wherein the number of the long strip groove is at least one.

[0019] In the above-mentioned extruder barrel, the cross section of the bushing is circular.

[0020] In the above-mentioned extruder barrel, the cross section of the bushing is arranged in an "8" shape.

[0021] In the above-mentioned extruder barrel, the bushing is a cylindrical bushing or a tapered cylindrical bushing.

[0022] In the above-mentioned extruder barrel, any two adjacent arc-shaped wear-resistant sleeves are fixed by welding after the concave-convex fitting.

[0023] The utility model also provides an extruder, comprising an extruder barrel.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The extruder barrel provided by the present invention is configured to split and splice a bushing with an alloy wear-resistant layer, thereby facilitating the repair of the worn bushing sprayed with an alloy layer, enabling continuous use and saving costs.

[0026] (2) By setting up a positioning structure, it can be ensured that the two adjacent arc-shaped wear-resistant sleeves do not move relative to each other at the joint. On the one hand, it ensures that the outer wall of the spliced ​​sleeve can be tightly attached to the inner wall of the inner tube to avoid the formation of gaps between the two. On the other hand, it ensures that the inner wall surface of the spliced ​​sleeve is smooth and does not collide with the screw nested in the inner tube, thereby improving the smoothness of material extrusion.

[0027] (3) The concave-convex fit between any two adjacent arc-shaped wear-resistant sleeves not only serves as a connecting structure between any two adjacent arc-shaped wear-resistant sleeves, but also serves as a guiding structure between the rear arc-shaped wear-resistant sleeve and the front adjacent arc-shaped wear-resistant sleeve, thereby ensuring the reliability of multiple arc-shaped wear-resistant sleeves when splicing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The utility model is a cross-sectional view of a bushing in an extruder barrel that is arranged in a cylindrical shape.

[0029] Figure 2 yes Figure 1 Cross-section of the extruder barrel shown.

[0030] Figure 3 It is an exploded view of the cross section of the bushing in a preferred embodiment of the present invention.

[0031] Figure 4 It is a partial structural diagram of a preferred embodiment of the present invention in which the protrusion on the bushing is a short strip-shaped protrusion.

[0032] Figure 5 yes Figure 4 Enlarged view of part A.

[0033] Figure 6 The utility model is a cross-sectional view of a bushing in an extruder barrel that is arranged in a conical column shape.

[0034] Figure 7 yes Figure 6 Cross-section of the extruder barrel shown.

[0035] Figure 8 yes Figure 6 The cross-section of the bushing in the extruder barrel is shown as an "8" shape.

[0036] Figure 9 yes Figure 6 The bushing in the extruder barrel with an "8"-shaped cross section is shown in an exploded view with the cross section divided into upper and lower parts.

[0037] Figure 10 yes Figure 6 The bushing in the extruder barrel with an "8"-shaped cross section is shown in an exploded view with the cross section divided into upper and lower parts and left and right parts.

[0038] Figure 11 It is a cross-sectional view of a bushing with an "8"-shaped cross section in another embodiment of an extruder barrel of the present utility model.

[0039] Figure 12 yes Figure 11 Explosion of the bushing shown Figure 1 .

[0040] Figure 13 yes Figure 11 Explosion of the bushing shown Figure 2 .

[0041] In the figure, 10, outer cylinder; 20, inner cylinder; 30, bushing; 31, arc-shaped wear-resistant sleeve; 311, wear-resistant layer; 32, long strip-shaped protrusion; 33, short strip-shaped protrusion; 34, long strip-shaped groove. DETAILED DESCRIPTION

[0042] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0043] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] Example 1

[0045] like Figures 1 to 10 As shown, the utility model provides an extruder barrel, comprising:

[0046] The outer cylinder 10 and the inner cylinder 20 are nested with each other;

[0047] The bushing 30 having an alloy wear-resistant layer 311 is nested in the inner tube 20, and the outer wall of the bushing 30 is tightly attached to the inner wall of the inner tube 20, so that the two form a seamless fit, wherein the bushing 30 includes at least two arc-shaped wear-resistant sleeves 31, and a columnar bushing 30 with a closed side is formed by splicing the two arc-shaped wear-resistant sleeves 31.

[0048] The utility model provides an extruder barrel, which is advantageous for repairing the sprayed alloy layer of the worn bushing 30 by splicing the bushing 30 in parts, so that the bushing 30 can be used continuously and the cost can be saved.

[0049] It is worth mentioning that the extruder barrel is used in conjunction with the extrusion screw, that is, the extrusion screw is nested in the extruder barrel, and the fluid material is extruded by the rotation of the extrusion screw in the extruder barrel, wherein the fluid extrusion material can be plastic, or other materials such as metal powder. During the extrusion process, the material will rub against the alloy wear-resistant layer 311 of the bushing 30, thereby wearing the thickness of the alloy wear-resistant layer 311, and then causing the overall thickness of the bushing 30 to become thinner. When the thickness of the bushing 30 becomes thinner, the bushing 30 needs to be replaced.

[0050] In the prior art, two methods are generally used to extend the service life of an extruder barrel. One method is to embed a bushing 30 within the inner barrel 20, and the bushing 30 is made of a solid alloy material with holes and then subjected to a quenching heat treatment process. The other method is to embed the bushing 30 within the inner barrel, and the bushing 30 includes an outer shell made of a common substrate and an alloy wear-resistant layer 311 attached to the inner wall of the outer shell by centrifugal casting. If the first method is used, when the bushing 30 is worn out after long-term use, the entire bushing 30 needs to be replaced, which is relatively expensive, as described in the reference document disclosed in the background art. If the second method is used, when the bushing 30 is worn out after long-term use, the thickness of the alloy wear-resistant layer 311 can be increased again by centrifugal casting. However, this method can only be used to increase the thickness of the alloy wear-resistant layer 311 by centrifugal casting when the diameters of the two ends of the bushing 30 are the same. If the diameters of the two ends of the bushing 30 are different, the thickness of the alloy wear-resistant layer 311 cannot be increased by centrifugal casting.

[0051] Therefore, in this embodiment, the bushing 30 is provided in separate parts, so that the inner surface of each arc-shaped wear-resistant sleeve 31 can be increased in thickness by plasma surfacing, thermal spraying, laser cladding, supersonic velocity alloying, hot isostatic pressing, etc., after the bushing 30 is worn. After the thickness of the alloy wear-resistant layer 311 is increased, the multiple arc-shaped wear-resistant sleeves 31 are spliced ​​together to form a complete bushing 30. This allows for continued use, saves costs, and is convenient for assembly and disassembly.

[0052] It is further pointed out that in order to avoid misalignment of any two adjacent arc-shaped wear-resistant sleeves 31 at the splicing point when two or even more arc-shaped wear-resistant sleeves 31 are spliced, a positioning structure can be set between any two adjacent arc-shaped wear-resistant sleeves 31, and the connection between the two adjacent arc-shaped wear-resistant sleeves 31 can be fixed by welding at the positioning structure.

[0053] In this embodiment, by setting a positioning structure, it is possible to ensure that the two adjacent arc-shaped wear-resistant sleeves 31 do not move relative to each other at the splicing point. On the one hand, it is ensured that the outer wall of the spliced ​​sleeve 30 can be tightly attached to the inner wall of the inner tube 20 to avoid the formation of gaps between the two. On the other hand, it is ensured that the inner wall surface of the spliced ​​sleeve 30 is smooth and does not collide with the screw nested in the inner tube 20, thereby improving the smoothness of material extrusion.

[0054] Preferably, the positioning structure can be selected in various ways, as long as it can ensure that no radial relative movement occurs between two adjacent arc-shaped wear-resistant sleeves 31. In this embodiment, the positioning structure is to achieve seamless splicing between any two adjacent arc-shaped wear-resistant sleeves 31 through concave-convex matching, and fix the splicing at the splicing point by welding.

[0055] When the bushing 30 needs to be replaced, it is only necessary to knock off the welding points and then remove the two separately arranged arc-shaped wear-resistant sleeves 31 from the inner cylinder 20 , thereby achieving the purpose of replacing the bushing 30 .

[0056] It is worth mentioning that, when two or more arc-shaped wear-resistant sleeves 31 are assembled into the inner cylinder 20, two methods can be adopted. One is to first splice the two or more arc-shaped wear-resistant sleeves 31 into a cylindrical sleeve 30 with a closed side, and then insert the spliced ​​sleeve 30 into the inner cylinder 20 as a whole to realize the assembly of the sleeve 30; the other is to insert the two or more arc-shaped wear-resistant sleeves 31 into the inner cylinder 20 one by one, so that the two or more arc-shaped wear-resistant sleeves 31 form a cylindrical sleeve 30 with a closed side in the inner cylinder 20, thereby realizing the assembly of the sleeve 30. When the sleeve 30 needs to be replaced, it is first necessary to knock off the welding point between the two adjacent arc-shaped wear-resistant sleeves 31, and then the arc-shaped wear-resistant sleeves 31 are pulled out from the inner cylinder 20 one by one. Therefore, in order to facilitate the replacement of the sleeve 30, the concave-convex fit between the two adjacent arc-shaped wear-resistant sleeves 31 is completed by plugging, and the plugging direction is along the axial direction of the sleeve 30. Such a positioning method not only facilitates the assembly of the bushing 30 , but also facilitates the disassembly of the arc-shaped wear-resistant sleeve 31 .

[0057] Further preferably, when two adjacent arc-shaped wear-resistant sleeves 31 are matched in concave-convex manner, a convex portion and / or a concave portion is provided on one of the two arc-shaped wear-resistant sleeves 31 , and a corresponding concave portion and / or convex portion is provided on the other arc-shaped wear-resistant sleeve 31 .

[0058] It is worth mentioning that when assembling the bushing 30, one of the arc-shaped wear-resistant sleeves 31 can be optionally inserted into the inner cylinder 20, and then the adjacent arc-shaped wear-resistant sleeves 31 are inserted into the inner cylinder 20 one by one. At this time, the concave-convex fit between any two adjacent arc-shaped wear-resistant sleeves 31 not only serves as a connecting structure between any two adjacent arc-shaped wear-resistant sleeves 31, but also serves as a guiding structure between the latter arc-shaped wear-resistant sleeve 31 and the previous adjacent arc-shaped wear-resistant sleeve 31, thereby ensuring the reliability of multiple arc-shaped wear-resistant sleeves 31 when splicing.

[0059] Preferably, when the number of arc-shaped wear-resistant sleeves 31 is two, the cross-section of each arc-shaped wear-resistant sleeve 31 is semicircular; when the number of arc-shaped wear-resistant sleeves 31 is multiple, the cross-section of each arc-shaped wear-resistant sleeve 31 is circular arc-shaped. However, regardless of whether it is a semicircular arc-shaped wear-resistant sleeve 31 or a circular arc-shaped arc-shaped wear-resistant sleeve 31, its convex portion or concave portion is located on the end surfaces on both sides of the open end of the arc-shaped wear-resistant sleeve 31. If it is a convex portion, it protrudes from the end surfaces on both sides of the open end of the arc-shaped wear-resistant sleeve 31; if it is a concave portion, it is recessed downward along the end surfaces on both sides of the open end of the arc-shaped wear-resistant sleeve 31.

[0060] It is worth mentioning that the two ends of the convex portion are flush with the two ends of the corresponding arc-shaped wear-resistant sleeve 31 along the axial direction, and the two ends of the concave portion are also flush with the two ends of the corresponding arc-shaped wear-resistant sleeve 31 along the axial direction. This arrangement makes the side surface of the entire spliced ​​bushing 30 a complete closed structure, preventing the extruded material from falling into the splicing area of ​​any two adjacent arc-shaped wear-resistant sleeves 31 when the extruder barrel is in operation.

[0061] In addition, the convex portion or the concave portion is integrally provided with the corresponding arc-shaped wear-resistant sleeve 31 .

[0062] Further preferably, when the number of arc-shaped wear-resistant sleeves 31 is two, convex portions are provided on both side end faces of the open end of one of the arc-shaped wear-resistant sleeves 31, and concave portions are provided on both side end faces of the open end of the other arc-shaped wear-resistant sleeve 31, or, convex portions and concave portions are respectively provided on both side end faces of the open end of each arc-shaped wear-resistant sleeve 31.

[0063] Further preferably, when there are multiple arc-shaped wear-resistant sleeves 31, convex portions and concave portions are respectively provided on both side end faces of the open end of each arc-shaped wear-resistant sleeve 31, or convex portions and concave portions are respectively provided on both side end faces of the open end of at least one arc-shaped wear-resistant sleeve 31, and convex portions are provided on both side end faces of the open end of the remaining arc-shaped wear-resistant sleeves 31, or concave portions are provided on both side end faces of the open end.

[0064] It is worth mentioning that, depending on the number of arc-shaped wear-resistant sleeves 31 , the arc-shaped wear-resistant sleeves 31 can be selectively replaced to achieve splicing between two adjacent arc-shaped wear-resistant sleeves 31 , and finally form a bushing 30 with a closed side structure, which is flexible and reliable to operate.

[0065] Preferably, the convex portion can be a whole long strip convex block 32, extending from one end of the arc-shaped wear-resistant sleeve 31 along the axial direction to the other end of the arc-shaped wear-resistant sleeve 31, or the whole strip convex block can be divided into multiple short strip convex blocks 33, wherein the lengths of the multiple short strip convex blocks 33 can be the same or different, and the spacing between any two adjacent short strip convex blocks 33 can be the same or different. When the convex portion is a long strip convex block 32, the two ends of the long strip convex block 32 are respectively flush with the two ends of the corresponding arc-shaped wear-resistant sleeve 31 along the axial direction; when the convex portion includes multiple short strip convex blocks 33, one end of the short strip convex block 33 close to the two ends of the corresponding arc-shaped wear-resistant sleeve 31 along the axial direction is flush with the end surface of the arc-shaped wear-resistant sleeve 31.

[0066] It is worth mentioning that when the convex portion includes a plurality of short strip-shaped protrusions 33 , the plurality of short strip-shaped protrusions 33 may be located on the same straight line, or two adjacent short strip-shaped protrusions 33 may be staggered.

[0067] Preferably, since any two adjacent arc-shaped wear-resistant sleeves 31 are connected by plugging during assembly, the concave portion is a whole long strip groove 34, and the two ends of the long strip groove 34 are respectively flush with the two ends of the corresponding arc-shaped wear-resistant sleeve 31 along the axial direction, wherein the number of the whole long strip groove 34 can be one or more. The reason why the long strip groove 34 is set as one or more is that when the convex portion is a whole long strip protrusion 32, or a plurality of short strip protrusions 33 not on the same straight line, a single long strip groove 34 can include the whole long strip protrusion 32, or include the short strip protrusions 33 on different straight lines, or a plurality of long strip grooves 34 can include the long strip protrusions 32 on different straight lines, or include the short strip protrusions 33 on different straight lines.

[0068] It is worth mentioning that the convex portion can be in the shape of a "J", or in the shape of a "dome", or in the shape of a "sawtooth", or in the shape of a "wave", etc. As long as the corresponding concave and convex fit can be achieved, it is acceptable. Preferably, the cross section of the bushing 30 can be set to different shapes according to the number of extrusion screws applicable to the extruder barrel. When the extruder barrel is applicable to a single extrusion screw, the cross section of the bushing 30 is a circular setting; when the extruder barrel is applicable to two extrusion screws, the cross section of the bushing 30 is an "8" shaped setting.

[0069] It is worth mentioning that no matter the bushing 30 is circular in cross section or the bushing 30 is 8-shaped in cross section, the bushing 30 is cylindrical. When the diameters at both ends of the cylindrical bushing 30 are the same, it is a cylindrical bushing 30; when the diameters at both ends of the cylindrical bushing 30 are different, it is a conical bushing 30.

[0070] In addition, when the cross-section of the bushing 30 is set in an "8" shape, the entire "8"-shaped bushing can be divided into two "3"-shaped arc-shaped wear-resistant sleeves 31, or the "8"-shaped bushing can be first divided into two large semicircular arc-shaped wear-resistant sleeves 31, and then the large semicircular arc-shaped wear-resistant sleeve 31 can be divided into two small semicircular arc-shaped wear-resistant sleeves 31, or multiple small semicircular arc-shaped wear-resistant sleeves 31.

[0071] Example 2

[0072] like Figures 11 to 13As shown, the difference between this embodiment and the first embodiment is that the bushing splicing structure in the first embodiment is different from that in the present embodiment. Although both use a concave-convex splicing method, the concave-convex splicing in the present embodiment is like a stepped concave-convex splicing, which is more convenient to process. In addition, the bushing splicing method in this embodiment can be the same as that in the first embodiment, and can be divided into two pieces or four pieces.

[0073] It should be noted that, in the present utility model, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0074] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0075] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. An extruder barrel, comprising an outer barrel and an inner barrel which are nested with each other, characterized in that: Also includes: A bushing with a wear-resistant layer is nested in an inner tube, and the outer wall of the bushing is tightly attached to the inner wall of the inner tube, so that a seamless fit is formed between the two. The bushing includes at least two arc-shaped wear-resistant sleeves, and a columnar bushing with a closed side is formed by splicing the two arc-shaped wear-resistant sleeves.

2. The extruder barrel according to claim 1, characterized in that A positioning structure is arranged between any two adjacent arc-shaped wear-resistant sleeves, and the relative sliding of the two adjacent arc-shaped wear-resistant sleeves in the radial direction is limited by the positioning structure.

3. The extruder barrel according to claim 2, characterized in that The positioning structure between any two adjacent arc-shaped wear-resistant sleeves realizes seamless splicing between the two through concave-convex matching, wherein, when the two adjacent arc-shaped wear-resistant sleeves are in concave-convex matching, the connection direction between the two moves relatively along the axial direction of the arc-shaped wear-resistant sleeves.

4. The extruder barrel according to claim 3, characterized in that When two adjacent arc-shaped wear-resistant sleeves are matched in concave and convex configuration, a convex portion and / or a concave portion is arranged on one of the two arc-shaped wear-resistant sleeves, and a corresponding concave portion and / or a convex portion is arranged on the other arc-shaped wear-resistant sleeve.

5. The extruder barrel according to claim 4, characterized in that The convex part or the concave part is arranged on the end surfaces on both sides of the opening end of the arc-shaped wear-resistant sleeve, wherein the convex part protrudes from the end surfaces on both sides of the opening end of the arc-shaped wear-resistant sleeve, and the concave part is concave downward along the end surfaces on both sides of the opening end of the arc-shaped wear-resistant sleeve.

6. The extruder barrel according to claim 4, characterized in that The two ends of the convex part are flush with the two ends of the corresponding arc-shaped wear-resistant sleeve along the axial direction, and the two ends of the concave part are flush with the two ends of the corresponding arc-shaped wear-resistant sleeve along the axial direction, wherein the convex part or the concave part is integrally arranged with the corresponding arc-shaped wear-resistant sleeve.

7. The extruder barrel according to any one of claims 4 to 6, characterized in that When there are two arc-shaped wear-resistant sleeves, convex portions are provided on both side end surfaces of the opening end of one arc-shaped wear-resistant sleeve, and concave portions are provided on both side end surfaces of the opening end of the other arc-shaped wear-resistant sleeve, or convex portions and concave portions are provided on both side end surfaces of the opening end of each arc-shaped wear-resistant sleeve.

8. The extruder barrel according to any one of claims 4 to 6, characterized in that When there are multiple arc-shaped wear-resistant sleeves, convex portions and concave portions are respectively arranged on the end surfaces on both sides of the opening end of each arc-shaped wear-resistant sleeve, or convex portions and concave portions are respectively arranged on the end surfaces on both sides of the opening end of at least one arc-shaped wear-resistant sleeve, and convex portions are arranged on the end surfaces on both sides of the opening ends of the remaining arc-shaped wear-resistant sleeves, or concave portions are arranged.

9. The extruder barrel according to any one of claims 4 to 6, characterized in that The convex portion is a long strip convex block, and the two ends of the long strip convex block are respectively flush with the two ends of the corresponding arc-shaped wear-resistant sleeve along the axial direction; or the convex portion includes multiple short strip convex portions, and one end of the short strip convex blocks close to the two ends of the corresponding arc-shaped wear-resistant sleeve along the axial direction is flush with the end surface of the arc-shaped wear-resistant sleeve.

10. The extruder barrel according to claim 9, characterized in that When the convex portion includes a plurality of short strip-shaped convex blocks, the plurality of short strip-shaped convex blocks are located on the same straight line, or two adjacent short strip-shaped convex blocks are arranged in a staggered manner.

11. The extruder barrel according to claim 9, characterized in that The concave portion is a long strip groove, and two ends of the long strip groove are respectively flush with two ends of the corresponding arc-shaped wear-resistant sleeve along the axial direction, wherein the number of the long strip groove is at least one.

12. The extruder barrel according to claim 1, characterized in that The cross section of the bushing is circular.

13. The extruder barrel according to claim 1, characterized in that The cross section of the bushing is arranged in an "8" shape.

14. The extruder barrel according to claim 1, characterized in that The bushing is a cylindrical bushing or a conical bushing.

15. The extruder barrel according to claim 1, characterized in that Any two adjacent arc-shaped wear-resistant sleeves are fixed by welding after the concave-convex fitting.

16. An extruder, characterized in that Comprising the extruder barrel according to any one of claims 1 to 15.

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