KR102345033B1 - Mixer for mixing of rubber and method for controlling the same - Google Patents

Abstract

A mixer for mixing rubber according to one embodiment of the present invention comprises: a chamber; a rotor which rotates in the chamber and mixes the rubber; and at least one sleeve which is arranged along an inner lateral side of the chamber, wherein the at least one sleeve is attached to and detached from the inner lateral side of the chamber. According to the present invention, the mixer can be easily managed.

Description

Mixer for mixing rubber and method for controlling the same

The present invention relates to a rubber mixing mixer and a control method therefor, and more particularly, to a rubber mixing rubber mixer for manufacturing rubber for tires and a control method thereof.

In general, rubber for tires is manufactured by mixing natural rubber, chemical rubber, and chemicals into a chamber of a mixer and then mixing in the chamber to have desired physical properties. At this time, it is required to secure the stable quality of the compound manufactured through mixing.

The compound is formed by mixing rubber and chemicals by the rotor rotating in the chamber. In the process of mixing rubber and chemicals, the inner surface of the chamber or the rotor is worn, so that the gap between the inner surface of the chamber and the rotor is expanded. can When the gap is expanded, there may be problems in the quality and productivity of the compound generated in the chamber, and it is necessary to periodically replace the chamber in order to secure stable quality of the compound and maintain productivity.

However, even though the inner surface of the chamber is partially worn during replacement, since the entire large chamber constituting the mixer needs to be replaced, it is difficult to manage the mixer equipment, and there is a problem in that the replacement cost is also consumed considerably.

The present invention is to solve the above problems, and to provide a mixer for rubber mixing having a structure that can be easily replaced and a control method therefor.

However, these problems are exemplary, and the problems to be solved by the present invention are not limited thereto.

A mixer for mixing rubber according to an embodiment of the present invention includes: a chamber; a rotor rotating inside the chamber and mixing rubber; and at least one sleeve arranged along an inner surface of the chamber, wherein the at least one sleeve is detachable from the inner surface of the chamber.

In the mixer for mixing rubber according to an embodiment of the present invention, the rotor includes first and second rotors arranged side by side and rotating, and the chamber has an inner side surface of one side surface of the first rotor and the second rotor side It includes first and second chambers respectively surrounding the other side surfaces, and first and second sleeve parts each including at least one sleeve may be mounted on inner surfaces of the first and second chambers.

In the mixer for mixing rubber according to an embodiment of the present invention, an inner surface of the chamber may have a concave curved surface, and at least one sleeve may be mounted on the first and second sleeve parts along the curved surface of the chamber.

In the mixer for mixing rubber according to an embodiment of the present invention, the at least one sleeve may be formed to be bent to have a curvature corresponding to the inner surface of the chamber.

In the mixer for mixing rubber according to an embodiment of the present invention, the at least one sleeve may include a plurality of sleeves.

In the mixer for mixing rubber according to an embodiment of the present invention, all of the plurality of sleeves may be formed in the same shape.

In the mixer for rubber mixing according to an embodiment of the present invention, the first and second sleeve parts may include at least one sleeve extending in a direction perpendicular to the rotation direction of the rotor.

In the mixer for mixing rubber according to an embodiment of the present invention, the at least one sleeve may include a plurality of assembly holes formed on the surface.

In the mixer for mixing rubber according to an embodiment of the present invention, the at least one sleeve may further include a cooling water flow passage passing therethrough.

In the mixer for mixing rubber according to an embodiment of the present invention, the cooling water flow path may include: a first cooling water flow path formed in a direction parallel to an extension direction of the at least one sleeve; and a second coolant flow path formed in a direction perpendicular to an extension direction of the at least one sleeve.

In the mixer for mixing rubber according to an embodiment of the present invention, the at least one sleeve may include a plurality of sleeves, and second coolant flow paths disposed in each of the plurality of sleeves may be connected to each other.

In the mixer for mixing rubber according to an embodiment of the present invention, the first and second sleeve parts may include at least one sleeve extending along a rotational direction of the rotor.

In the mixer for mixing rubber according to an embodiment of the present invention, the surface of the at least one sleeve may be subjected to thermosetting treatment.

In the mixer for mixing rubber according to an embodiment of the present invention, the surface hardness (HRC) of the at least one sleeve may be 45 or more.

In the mixer for mixing rubber according to an embodiment of the present invention, the at least one sleeve may be plated with hard chrome.

A method for controlling a mixer for mixing rubber according to an embodiment of the present invention includes increasing a gap between the at least one sleeve and a rotor positioned inside the chamber due to wear; and adjusting the gap by replacing at least one sleeve arranged on the inner surface of the chamber with at least one sleeve having a thicker thickness.

Other aspects, features and advantages other than those described above will become apparent from the following detailed description, claims and drawings for carrying out the invention.

A mixer for rubber mixing and a control method thereof according to an embodiment of the present invention are designed so that a sleeve is placed on the inner surface of a chamber, which is an expensive and large-scale facility that requires periodic replacement, and only the sleeve can be replaced at the time of replacement. Management of the mixer can be made more easily.

In addition, the mixer for rubber mixing and the control method thereof according to an embodiment of the present invention can improve the quality of the compound by manufacturing a sleeve formed of a material different from the chamber to have high hardness.

In addition, the mixer for rubber mixing and the control method thereof according to an embodiment of the present invention can secure the cooling performance of the mixer by processing the coolant flow path inside the sleeve.

In addition, the mixer for rubber mixing and the control method thereof according to an embodiment of the present invention can minimize the risk of problems such as oil leakage and abnormal wear due to cracks by plating the sleeve with hard chrome.

In addition, in the mixer for rubber mixing and the control method thereof according to an embodiment of the present invention, the replacement cycle of the sleeve can be extended by using a sleeve of excellent hardness, and the sleeve structure other than the friction surface is reused by re-plating, etc. It can provide you with advantages.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a cross-sectional view of the inside of a rubber mixing mixer according to an embodiment of the present invention, in which a chamber and a rotor are visible.
Figure 2a is a view showing a state in which the sleeve according to an embodiment of the present invention is mounted on the inner surface of the chamber.
Figure 2b is a view showing a state in which a part of the sleeve according to an embodiment of the present invention is separated from the inner surface of the chamber.
FIG. 3 is a view showing a state in which a rotor disposed to form a sleeve and a gap in the chamber of FIG. 2 is inserted.
4 is a view showing the structure of a sleeve according to an embodiment of the present invention.
5 is a view showing a chamber in which a sleeve is disposed according to another embodiment of the present invention.
6 is a view showing a control method of a mixer for mixing rubber according to an embodiment of the present invention.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the description of the invention. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In the description of the present invention, even though shown in other embodiments, the same identification numbers are used for the same components.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and when described with reference to the drawings, the same or corresponding components are given the same reference numerals, and the overlapping description thereof will be omitted. .

In the following embodiments, terms such as first, second, etc. are used for the purpose of distinguishing one component from another, not in a limiting sense.

In the following examples, the singular expression includes the plural expression unless the context clearly dictates otherwise.

In the following embodiments, terms such as include or have means that the features or components described in the specification are present, and the possibility that one or more other features or components will be added is not excluded in advance.

In the drawings, the size of the components may be exaggerated or reduced for convenience of description. For example, since the size and thickness of each component shown in the drawings are arbitrarily indicated for convenience of description, the present invention is not necessarily limited to the illustrated bar.

In the following embodiments, the x-axis, the y-axis, and the z-axis are not limited to three axes on a Cartesian coordinate system, and may be interpreted in a broad sense including them. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but may refer to different directions that are not orthogonal to each other.

In cases where certain embodiments may be implemented otherwise, a specific process sequence may be performed different from the described sequence. For example, two processes described in succession may be performed substantially simultaneously, or may be performed in an order opposite to the order described.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. In the present application, terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, component, part, or a combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

For reference, unless specifically limited herein, the traveling direction may correspond to the X-axis direction, the width direction to the Y-axis direction, and the height direction to the Z-axis direction, respectively.

Hereinafter, a mixer for rubber mixing according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 .

1 is a cross-sectional view of the inside of a rubber mixing mixer according to an embodiment of the present invention, in which a chamber and a rotor are visible. Figure 2a is a view showing a state in which the sleeve according to an embodiment of the present invention is mounted on the inner surface of the chamber. Figure 2b is a view showing a state in which a part of the sleeve according to an embodiment of the present invention is separated from the inner surface of the chamber. FIG. 3 is a view showing a state in which a rotor disposed to form a sleeve and a gap in the chamber of FIG. 2 is inserted.

1 to 3 , the mixer for rubber mixing according to an embodiment of the present invention includes a chamber 100 , a rotor 200 rotating inside the chamber 100 and mixing rubber to produce a compound, and and at least one sleeve 311 , 321 arranged along the inner surface of the chamber 100 . At this time, the at least one sleeve 311 , 321 is detached from the inner surface of the chamber 100 .

In the process of manufacturing a compound by mixing rubber constituting the tire, the compound may be produced through rotation of the rotor 200 disposed inside the chamber 100 according to an embodiment of the present invention. The rotor 200 is formed in a circular shape, and rubber may be mixed by rotation of the rotor 200 to form a compound.

Referring to FIG. 1 , the chamber 100 may be mounted on side plates (not shown) disposed on both sides of the mixer. The rotor 200 may include first and second rotors 210 and 220 that are arranged side by side and rotate. In addition, the chamber 100 may include first and second chambers 110 and 120 formed so that the inner surface surrounds one side of the first rotor 210 and the other side of the second rotor 220 , respectively. The first and second sleeve portions 310 and 320 each including at least one sleeve 311 and 321 may be mounted on inner surfaces of the first and second chambers 110 and 120 .

Here, the first and second chambers 110 and 120 may be disposed to be spaced apart from each other. In the upper space spaced apart from the first and second chambers 110 and 120 , an input unit 130 for injecting raw materials for rubber and a chemical to mix them is located between the rotor 200 and the first and second chambers 110 and 120 . can do. In the lower space spaced apart from the first and second chambers 110 and 120 , the discharge unit 140 through which the mixing process is completed may be discharged.

A drop door 160 may be disposed below the first chamber 110 . The drop door 160 may open and close the discharge unit 140 through a rotational movement. Therefore, when the compound is manufactured by the rotation of the rotor 200 in the chamber 100, the drop door 160 is rotated to rotate the discharge unit 140 disposed on the lower side between the first and second chambers 110 and 120. can be closed After the compound manufacturing is completed, the drop door 160 may be reversely rotated to open the discharge unit 140 as shown in FIG. 1 , and the manufactured compound may be discharged to the lower side of the chamber 100 . The support 150 for supporting the chamber 100 , the drop door 160 , and the locking cylinder 170 may be formed at the lower end of the mixer.

A locking cylinder 170 may be disposed below the second chamber 120 . When the drop door 160 closes the discharge unit 140 , the locking cylinder 170 moves forward to lock the drop door 160 while the drop door 160 closes the discharge unit 140 .

When discharging the compound, the locking cylinder 170 is reversed to unlock the locking cylinder 170 and the drop door 160, and then the drop door 160 is rotated reversely to open the discharge unit 140. can

At least one of the sleeves 311 and 312 may be plated with hard chrome (Cr). In the case of hard chrome, there is no risk of cracking, so it is possible to prevent the occurrence of oil leakage or abnormal wear due to cracks in advance. In addition, the friction surface is plated with chrome with high hardness to ensure abrasion resistance, so that the quality of the compound can be secured during the mixing process. Surfaces of at least one of the sleeves 311 and 312 may be heat-cured. Through this, the hardness and abrasion resistance of the sleeves 311 and 312 may be improved.

At least one sleeve 311 , 312 may be detachable from the chamber 100 . Through this, the chamber 100 may be left as it is, and only the at least one sleeve 311 and 312 forming the friction surface may be removed from the chamber 100 and replaced with at least one new sleeve. Therefore, only at least one sleeve 311, 312 disposed on the friction surface of the chamber 100 as shown in FIG. 2b can be replaced by separating from the chamber 100 without replacing the entire large chamber 100. have.

For example, when the at least one sleeve 311, 312 located in the portion adjacent to the upper input part of the chamber 100 is worn due to the input material, only the worn at least one sleeve 311, 312 may be replaced. have. It is also possible to replace only the at least one sleeve 311 , 312 having an intensively worn friction surface.

At least one sleeve 311 , 312 may be formed of a plurality of sleeves 311 , 312 . In this case, when any one of the sleeves 311 and 312 is intensively worn, only the corresponding sleeve among the plurality of sleeves 311 and 312 may be replaced.

In addition, if only the sleeves 311 and 312 are plated with hard chrome, even if the chrome plate surfaces of the sleeves 311 and 312 are peeled off due to wear, after separating the sleeves 311 and 312 from the chamber 100 Since it can be re-plated on the friction surface of the chamber 100 by re-plating, the sleeves 311 and 312 can be reused, thereby significantly reducing equipment costs.

In addition, when the sleeves 311 and 312 are plated with hard chrome, the sleeve can have high hardness, and wear resistance is secured, so that the replacement cycle of the equipment itself can be extended compared to when using a conventional large integrated structure chamber. have. In this case, the surface hardness (HRC) of the sleeves 311 and 312 according to the present embodiment may have a high hardness value of 45 or more.

2A and 2B , the inner surface of the chamber 100 according to an embodiment of the present invention is formed in a concave curved surface, and the first and second sleeve parts 310 and 320 are curved surfaces of the chamber 100 . Accordingly, at least one sleeve 311 , 321 may be mounted. More specifically, the at least one sleeve 311 , 321 according to the present embodiment may be formed to extend along a direction perpendicular to the rotation direction of the rotor 200 .

At least one sleeve 311 , 321 may be formed to be bent to have a curvature corresponding to the inner surface of the chamber 100 . At least one sleeve 311 , 321 may be mounted to match the inner surface of the chamber 100 , thereby improving assembly properties.

The at least one sleeve 311 , 321 may be coupled to the inner surface of the chamber 100 in various ways. As an example, the assembly holes 311a and 321a shown in FIG. 4 are disposed in the sleeves 311 and 321 , the holes are also disposed on the inner surface of the chamber 100 , and the coupling member is formed in the assembly holes 311 and 321a and The sleeves 311 and 321 may be coupled to the inner surface of the chamber 100 by penetrating the hole formed in the inner surface of the chamber 100 . In this case, the coupling member may include various types of coupling members such as bolts and pins.

2A and 2B , at least one sleeve 311 , 312 may include two or more plurality of sleeves 311 , 312 . Since the plurality of sleeves 311 and 312 are mounted on the inner surface of the chamber 100 , only some of the sleeves 311 and 312 among the plurality of sleeves 311 and 312 may be selectively replaced.

Meanwhile, the plurality of sleeves 311 and 312 may be formed in the same shape as shown in FIGS. 2A and 2B . Therefore, even if only a part of the plurality of sleeves 311 and 312 is replaced, if the replaced sleeve is reused, the reuse sleeve can be remounted at a position different from the previously mounted position, so that the plurality of sleeves 311 and 312 can be more efficiently Can be recycled.

Hereinafter, the structure of the sleeve according to an embodiment of the present invention will be described in more detail with reference to FIG. 4 .

4 is a view showing the structure of a sleeve according to an embodiment of the present invention. For a description of a configuration not shown in FIG. 4 , reference may be made to the contents shown in FIGS. 1 to 3 .

Referring to FIG. 4 , at least one sleeve 311 , 321 according to an embodiment of the present invention may include a plurality of assembly holes 311a and 321a formed on a surface thereof. The at least one sleeve 311 and 321 may be coupled to the inner surface of the chamber 100 through the assembly hole.

For example, the at least one sleeve 311 and 321 may be coupled to the inner surface of the chamber 100 using a coupling member such as a bolt passing through the assembly holes 311a and 321a. When the at least one sleeve 311, 321 is removed from the chamber 100, after releasing the coupling of the coupling member fastened to the assembly hole 311a, 321a, the at least one sleeve 311, 321 is inserted into the chamber. It can be removed from (100).

According to the present embodiment, the at least one sleeve 311 and 321 may further include cooling water passages 311b and 321b passing therethrough. In more detail, the coolant flow passages 311b and 321b include first coolant flow passages 311b1 and 321b1 and at least one sleeve 311 and 321 formed in a direction parallel to the extending direction of the at least one sleeve 311 and 321 . It may include second cooling water passages 311b2 and 321b2 formed in a direction perpendicular to the extending direction of the . The first and second cooling water passages 311b1 , 311b2 , 321b1 , and 321b2 may be disposed to be perpendicular to each other in a direction corresponding to the curved rectangular parallelepiped shape of the sleeves 311 and 321 .

In order to maintain the stable quality and productivity of the compound, it is essential to secure the cooling performance of the mixer. In addition, with the development of rubber raw materials, a cooling facility that manages the temperature inside the chamber for raw materials such as silica can play an important role.

Accordingly, according to the present embodiment, by arranging the cooling water flow path structure responsible for the cooling function inside the at least one sleeve 311 and 321 that is compactly mounted on the friction surface of the chamber, the entire chamber is cooled when an abnormality occurs in the cooling function. By replacing only the sleeves 311 and 321 without replacement, it is possible to secure the cooling performance of the mixer through the coolant flow path mounted inside the sleeves 311 and 321 .

According to the present embodiment, the at least one sleeve 311 and 321 includes a plurality of sleeves 311 and 321 , and the second coolant flow passages 311b2 and 321b2 disposed in each of the plurality of sleeves 311 and 321 are can be connected to each other. Accordingly, the second coolant flow paths 311b2 and 321b2 may be connected to cover the entire friction surface covered by the plurality of sleeves 311 and 321 . Also, even when the sleeves 311 and 321 are replaced and reused as described above, the entrance and exit positions between the second cooling water passages 311b2 and 321b2 are all formed at the same position, so through the connection of the plurality of sleeves 311 and 321 Cooling performance can be ensured.

Hereinafter, a chamber structure of a mixer for rubber mixing according to another embodiment of the present invention will be described with reference to FIG. 5 .

5 is a view showing a chamber in which a sleeve is disposed according to another embodiment of the present invention. For a description of a configuration not shown in FIG. 5 , reference may be made to the contents shown in FIGS. 1 and 3 .

Referring to FIG. 5 , the first and second sleeve parts 310 and 320 according to another embodiment of the present invention include at least one sleeve 311 ′, 321 ′ extending along the rotation direction of the rotor 200 . may include The sleeve structure extending along the rotational direction of the rotor 200 according to another embodiment of the present invention is similarly mounted to be separated and replaced from the chamber 100, and the sleeves 311' and 312' with high hardness and wear resistance. They can be reused to increase the sleeve replacement cycle and prolong service life.

Hereinafter, a method of controlling a mixer for mixing rubber according to an embodiment of the present invention will be described with reference to FIG. 6 .

6 is a view showing a control method of a mixer for mixing rubber according to an embodiment of the present invention. For a description of a configuration not shown in FIG. 6 , reference may be made to the contents shown in FIGS. 1 to 3 .

Referring to FIG. 6 , in the control method of the mixer for rubber mixing according to an embodiment of the present invention, a gap between at least one sleeve 311 , 321 and the rotor 200 located inside the chamber due to wear ) is increased step (S100) and at least one sleeve (311, 321) arranged on the inner surface of the chamber 100 is replaced with at least one sleeve (311, 321) having a thicker thickness, the gap (Gap) This includes the adjusting step (S200).

When the mixer is operated, the surfaces of the rotor 200 and the at least one sleeve 311 and 321 are abraded in the process of producing the compound, so that the gap between the rotor 200 and the at least one sleeve 311 and 321 is a gap. This can be large. When the gap increases, the quality of compound production may be deteriorated, and it is necessary to maintain a constant gap between the at least one sleeve 311 and 321 and the rotor 200 .

Accordingly, according to the present embodiment, when the gap between the rotor 200 and the at least one sleeve 311 and 321 increases due to wear during operation of the mixer, a sleeve thicker than the sleeve originally mounted to maintain the gap It may include the process of replacing

Through this, the gap space in which the compound is produced due to wear is prevented from being widened and the gap between the rotor 200 and the at least one sleeve 311 and 321 is maintained at a certain level to maintain the quality of the compound.

As described above, the present invention has been described with reference to the embodiment shown in the drawings, but this is only an example. Those of ordinary skill in the art can fully understand that various modifications and equivalent other embodiments are possible from the embodiments. Therefore, the true technical protection scope of the present invention should be determined based on the appended claims.

Specific technical content described in the embodiment is an embodiment and does not limit the technical scope of the embodiment. In order to concisely and clearly describe the description of the invention, descriptions of conventional general techniques and configurations may be omitted. In addition, the connection or connection member of the lines between the components shown in the drawings exemplifies functional connections and/or physical or circuit connections, and in an actual device, various functional connections, physical connections that are replaceable or additional It may be expressed as a connection, or circuit connections. In addition, unless there is a specific reference such as "essential", "importantly", etc., it may not be a necessary component for the application of the present invention.

In the description and claims, "above" or similar referents may refer to both the singular and the plural unless otherwise specified. In addition, when a range is described in the embodiment, it includes the invention to which individual values belonging to the range are applied (unless there is a description to the contrary), and each individual value constituting the range is described in the description of the invention. same. In addition, the steps constituting the method according to the embodiment may be performed in an appropriate order unless the order is explicitly stated or there is no description to the contrary. The embodiments are not necessarily limited according to the order of description of the above steps. The use of all examples or exemplary terminology (eg, etc.) in the embodiment is merely for describing the embodiment in detail, and unless it is limited by the claims, the scope of the embodiment is limited by the examples or exemplary terminology. it is not In addition, those skilled in the art will appreciate that various modifications, combinations, and changes may be made in accordance with design conditions and factors within the scope of the appended claims or their equivalents.

100: chamber
110: first chamber
120: second chamber
200: rotor
210: first rotor
220: second rotor
310: first sleeve portion
320: second sleeve portion
311, 321, 311', 321': sleeve
311a, 321a: assembly hole
311b, 321b: coolant flow path
311b1, 321b1: first coolant flow path
311b2, 321b2: second coolant flow path
G: Gap

Claims (16)

chamber;
a rotor rotating inside the chamber and mixing rubber; and
at least one sleeve arranged along an inner surface of the chamber;
the at least one sleeve is detachable from the inner surface of the chamber;
The at least one sleeve further includes a coolant flow passage passing through the inside,
The cooling water flow path is
a first coolant flow path formed in a direction parallel to an extension direction of the at least one sleeve; and
and a second coolant flow path formed in a direction perpendicular to an extension direction of the at least one sleeve;
The at least one sleeve includes a plurality of sleeves, and the second coolant passages disposed in each of the plurality of sleeves are connected to each other. According to claim 1,
The rotor includes first and second rotors arranged side by side to rotate,
The chamber includes first and second chambers each having an inner surface surrounding one side of the first rotor and the other side of the second rotor,
A mixer for rubber mixing in which first and second sleeve parts each including at least one sleeve are mounted on inner surfaces of the first and second chambers. 3. The method of claim 2,
The inner surface of the chamber is formed to have a concave curved surface, and the first and second sleeve parts are equipped with at least one sleeve along the curved surface of the chamber. 4. The method of claim 3,
The at least one sleeve is formed to be bent to have a curvature corresponding to the inner surface of the chamber. delete According to claim 1,
A mixer for mixing the plurality of sleeves are all formed in the same shape. 3. The method of claim 2,
The first and second sleeve parts include at least one sleeve extending in a direction perpendicular to a rotation direction of the rotor. 8. The method of claim 7,
The at least one sleeve is a mixer for mixing rubber including a plurality of assembly holes formed on the surface. delete delete delete According to claim 1,
The first and second sleeve parts include at least one sleeve extending along a rotational direction of the rotor. According to claim 1,
A surface of the at least one sleeve is thermoset-treated for mixing rubber. According to claim 1,
A mixer for rubber mixing, wherein the surface hardness (HRC) of the at least one sleeve is 45 or more. According to claim 1,
wherein the at least one sleeve is plated with hard chrome. increasing a gap between the at least one sleeve and the rotor positioned inside the chamber due to wear; and
adjusting the gap by replacing at least one sleeve arranged on the inner surface of the chamber with at least one sleeve having a thicker thickness;
The at least one sleeve further includes a coolant flow passage passing through the inside,
The cooling water flow path is
a first coolant flow path formed in a direction parallel to an extension direction of the at least one sleeve; and
and a second coolant flow path formed in a direction perpendicular to an extension direction of the at least one sleeve;
The at least one sleeve includes a plurality of sleeves, and the second coolant passages disposed in each of the plurality of sleeves are connected to each other.

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