A baffle component for the overflow outlet of a kiln in a rolled glass forming process

Abstract

This utility model provides a baffle component for the overflow port of a kiln in a rolled glass forming process. It is set up with a composite brick structure consisting of a frame structure and a brick body. The two work together to form a heating space to accommodate the heating unit. The shape of the heating unit matches and conforms to the shape of the alloy working surface of the brick, thereby ensuring uniform heating and heat preservation. The brick body is designed to be longitudinally movable relative to the frame structure, which facilitates the quick removal of irregularly shaped heating units from the sharp-cornered heating space and enables rapid replacement. This solves the technical problems in the prior art, such as rapid heat dissipation from the working surface of the steel-edged brick, poor heating and heat preservation uniformity of conventional heating elements, and difficulty in replacement.

Description

Technical Field

[0001] This utility model relates to the field of glass preparation equipment technology, and in particular to a baffle component for the overflow port of a kiln in a rolled glass forming process. Background Technology

[0002] Edge sealing bricks refer to two specially shaped refractory bricks or heat-resistant steel parts of the same shape located on both sides of the top surface of the lip brick, which together with the lip brick form the overflow channel. Their function is to prevent the glass melt above the lip brick from overflowing and to send the glass melt that has reached the forming temperature requirement into the rolling mill.

[0003] Chinese patent CN202421019923.7 discloses a steel brick composite edge block for rolled glass forming. This steel brick composite edge block includes: an edge block body with a pointed tip a at one end, both the upper and lower parts of which are arc-shaped. The arc-shaped surfaces at the upper and lower parts of the pointed tip a are respectively adapted to the upper and lower rolling rollers. A locking part a for engaging with a lip brick is provided on the inner side of the lower arc-shaped surface of the pointed tip a; and a baffle structure, which is located inside the pointed tip a, and at least the portion between the upper and lower rolling rollers is shaped according to the outer contour of the pointed tip a. The baffle structure is made of heat-resistant steel. By providing an alloy baffle structure shaped to the outer contour of the pointed tip of the edge block, a precise contour is achieved.

[0004] However, this technical solution has the following shortcomings: due to the high thermal conductivity of steel, the steel edge bricks dissipate heat quickly, resulting in low temperature of the glass melt at the edge during the rolling process, leading to crystallization and ultimately affecting the glass yield. In addition, the conventional structure heating element setting results in poor heating uniformity of the entire working surface of the steel edge bricks and is not easy to replace, affecting the production schedule. Summary of the Invention

[0005] One of the objectives of this invention is to address the shortcomings of existing technologies by providing a baffle component for the overflow port of a kiln in a rolled glass forming process. This component is a composite brick structure consisting of a frame structure and a brick body. The two components work together to form a heating space that accommodates a heating unit. The shape of the heating unit matches and conforms to the shape of the alloy working surface of the brick, thus ensuring uniform heating and heat preservation. Furthermore, the brick body is designed to be longitudinally movable relative to the frame structure, allowing irregularly shaped heating units to quickly detach from the sharp-angled heating space for rapid replacement. This solves the technical problems of rapid heat dissipation from the working surface of the steel-edged brick, poor heating and heat preservation uniformity of conventional heating elements, and difficulty in replacement found in existing technologies.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A baffle member for the overflow port of a kiln in a rolled glass forming process includes a frame portion and a brick portion installed within the frame portion. A heating space is formed between the longitudinal working surface side of the frame portion and the brick portion. The portion of the heating space that is adapted to the upper and lower rolling rolls has a pointed corner A. A heating unit is installed on the brick portion. At least the working part of the heating unit is accommodated within the heating space, and the shape of the working part is configured to cover the heating space in a conformal manner. The brick portion is longitudinally movable relative to the frame portion so that the working part of the heating unit moves out from the pointed corner A.

[0008] Preferably, the brick body includes a brick base frame and a brick body installed in the brick base frame, wherein the brick base frame is connected to an external drive mechanism to drive the brick body to move longitudinally, and the heating unit is installed on the brick body and its working part has a pointed corner B that conforms to the shape of the pointed corner A and the pointed corner B extends into the pointed corner A.

[0009] Preferably, both the frame portion and the brick base frame are alloy frames, and the brick body is a refractory brick.

[0010] Preferably, the heating unit is configured as an integral structure, that is, a single heating element, the shape of which is adapted to the shape of the heating space so as to cover the heating space.

[0011] Preferably, the brick base frame accommodates at least the lower part of the brick body, and includes side plates A and B arranged laterally opposite each other and side plates C and D arranged longitudinally opposite each other, which together form a frame structure, and also includes a base plate connected to the bottom of the frame structure.

[0012] Preferably, the frame portion includes a first side plate and a second side plate arranged laterally opposite each other, and a top plate and a bottom plate arranged vertically opposite each other, which together form a frame structure. It also includes a third side plate that completely seals off the longitudinal side of the frame structure away from the brick body portion. Thus, the frame portion forms an internal space, which is divided into a first part, a second part and a third part in sequence along the longitudinal direction. The first part forms the heating space, the second part forms a second installation space for accommodating the brick body portion, and the third part forms a third installation space for accommodating the wires. The installation part of the heating unit extends into the third installation space to be electrically connected to the wires.

[0013] Preferably, the longitudinal dimension of the second side plate is adapted to the longitudinal dimension of the first part, and the brick part is in contact with and limited by the second side plate; the lateral end of the bottom plate and the lateral end of the third side plate in the first part together with the second side plate form the pointed corner A.

[0014] Preferably, the longitudinal dimensions of the first side plate, top plate, and bottom plate cover the sum of the longitudinal dimensions of the first part, the second part, and the third part.

[0015] Preferably, the heating unit is configured as a split structure, which includes a first heating element that matches the pointed corner A and at least one second heating element; both the first heating element and the second heating element include a working part and an installation part that are connected to each other, and an installation groove A is provided on the brick part, and the installation part is horizontally installed in the installation groove A.

[0016] Preferably, the working portion of the first heating element has the pointed corner B.

[0017] Preferably, the second heating element is arranged side by side with the first heating element.

[0018] Preferably, the working parts of both the first heating element and the second heating element are arranged vertically; the working part of the second heating element is configured as a U-shaped structure.

[0019] Preferably, the mounting groove A is configured as a through-hole structure that penetrates the brick body or as a semi-groove structure opened on the upper surface of the brick body.

[0020] Preferably, a limiting support is provided in the heating space, and the bottom of the working part is limited and installed in the support groove of the limiting support to obtain vertical support and longitudinal limitation.

[0021] Preferably, the device also includes a temperature measuring component installed on the brick portion, wherein the brick portion has an installation groove B, the temperature measuring component is installed in the installation groove B and its working end extends into the heating space.

[0022] Preferably, the temperature measuring component is a thermocouple.

[0023] Preferably, the portion of the brick body that is adapted to the calender roll has a pointed corner C, and the pointed corner C has the same size as the pointed corner A.

[0024] Preferably, the portion of the brick body that is adapted to the calender roll has a pointed corner C, the size of which is smaller than that of the pointed corner A, thereby forming a step between them that is adapted to install the calender roll bushing.

[0025] The beneficial effects of this utility model are as follows:

[0026] (1) This utility model sets up a composite brick structure consisting of a frame structure and a brick body, which together form a heating space to accommodate the heating unit. The shape of the heating unit matches the shape of the alloy working surface of the brick, thereby ensuring the uniformity of heating and heat preservation. The brick body is designed to be able to move longitudinally relative to the frame structure, which makes it easy for the irregular heating unit to quickly leave the sharp-cornered heating space and thus achieve quick replacement. The quick replacement method of the irregular heating element is ingenious and convenient.

[0027] (2) The sealing brick for glass kiln of this utility model can take into account the full and uniform heating and heat preservation of the working surface of the sealing brick and the rapid replacement of the heating unit. The structural design is highly practical, ensures the forming quality of glass products, ensures continuous production efficiency, and effectively avoids delaying the production period, so that the labor intensity and time of operators under high temperature are greatly reduced.

[0028] (3) The present invention uses a split structure for the heating unit, which can not only fully adapt to the shape of the irregular heating space for arrangement and adapt to the customized design for the edge bricks of different sizes, but also facilitate the replacement of individual heating elements and save costs. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0030] Figure 2 This is a front perspective view of the overall structure of this utility model;

[0031] Figure 3 This is a partial structural schematic diagram of the present invention (excluding the third side plate);

[0032] Figure 4 This is a partial exploded view of the structure of this utility model (excluding the frame portion);

[0033] Figure 5 This is a schematic diagram of the frame portion of this utility model;

[0034] Figure 6 This is a partial structural diagram of the present invention (excluding the frame portion);

[0035] Figure 7 for Figure 2 Sectional view at point A in the middle;

[0036] Figure 8 for Figure 2 Sectional view at point B;

[0037] Figure 9 This is a schematic diagram of the structure of Example 5. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] Example 1

[0041] like Figures 1-3 As shown, a baffle member for the overflow port of a kiln in a rolled glass forming process includes a frame portion 1 and a brick portion 2 installed within the frame portion 1. A heating space is formed between the longitudinal working surface side of the frame portion 1 and the brick portion 2. The portion of the heating space that is adapted to the upper and lower rolling rolls has a sharp corner A110. A heating unit 3 is installed on the brick portion 2. At least the working part 301 of the heating unit 3 is accommodated within the heating space, and the shape of the working part 301 is configured to cover the heating space in a conformal manner. The brick portion 2 can be longitudinally moved relative to the frame portion 1 so that the working part 301 of the heating unit 3 can be moved out from the sharp corner A110.

[0042] In this embodiment, a composite brick structure consisting of a frame structure 1 and a brick body 2 is provided. The frame structure 1 has a sharp corner A110 that can match and conform to the contours of the upper and lower calendering rolls, thereby effectively preventing edge crystallization during glass calendering. Furthermore, the frame structure 1 and the brick body 2 are configured to form a heating space together, and an irregularly shaped heating unit 3 is provided to match the working surface of the frame structure 1 with the sharp corner. The heating unit 3 can conformally cover the sharp corner heating space on the working surface of the frame structure 1, thereby achieving sufficient and uniform heating and heat preservation of the edge of the sealing brick, thereby controlling and reducing the lateral temperature difference during glass forming in front of the calendering roll as much as possible, ensuring the quality of glass forming and the yield.

[0043] Based on this, by further designing the brick part 2 to be longitudinally movable relative to the frame structure 1, it is convenient for the irregularly shaped heating unit 3 to be quickly removed from the heating space with sharp corner A110 for replacement or maintenance. The quick-installation replacement method for the irregularly shaped heating element 3 is ingenious and convenient, which can ensure continuous production efficiency and effectively avoid delaying the production schedule.

[0044] As a preferred option, combined with Figure 4 As shown, the brick body part 2 includes a brick base frame 21 and a brick body 22 installed in the brick base frame 21. The brick base frame 21 is connected to an external drive mechanism to drive the brick body part 2 to move longitudinally. The heating unit 3 is installed on the brick body 22 and its working part 301 has a pointed corner B310 that conforms to the shape of the pointed corner A110 and extends into the pointed corner A110.

[0045] Preferably, both the frame portion 1 and the brick base frame 21 are alloy frames, and the brick body 22 is a refractory brick.

[0046] It is worth noting that by setting both the frame part 1 and the brick base frame 21 as alloy frames, and taking advantage of the material's precision machinability, the shape of the edge-sealing brick tip area can be precisely matched with the outer circle of the upper and lower rolling rollers, thereby effectively preventing the glass liquid from overflowing and ensuring the glass yield.

[0047] As a supplementary explanation, the alloy body 1 is made of a heat-resistant alloy, including but not limited to nickel-chromium alloy.

[0048] As a supplementary explanation, the brick 22 is used for thermal insulation.

[0049] As a supplementary explanation, the working surface of the frame part 1 refers to the side that is in direct contact with the molten glass.

[0050] In this embodiment, the heating unit 3 is configured as an integral structure, that is, a single heating element. The shape of the heating element is adapted to the shape of the heating space so as to cover the heating space and ensure the heating effect of all parts of the working surface of the frame part 1.

[0051] As a preferred option, such as Figure 4 As shown, the brick base frame 21 accommodates and installs at least the lower part of the brick body 22. It includes side plates A201 and B202 arranged laterally opposite each other, and side plates C203 and D204 arranged longitudinally opposite each other, which together form a frame structure. It also includes a base plate 205 connected to the bottom of the frame structure.

[0052] As a preferred option, such as Figure 1 , Figure 8 As shown, it also includes a temperature measuring component 4 installed on the brick part 2. The brick part 2 has an installation groove B212. The temperature measuring component 4 is installed in the installation groove B212 and its working end extends into the heating space.

[0053] Preferably, the temperature measuring component 4 is a thermocouple.

[0054] Example 2

[0055] The components in this embodiment that are the same as or corresponding to those in the above embodiments are referred to by the same reference numerals as those in the above embodiments. For the sake of simplicity, only the differences between this embodiment and the above embodiments are described below. The difference between this embodiment and the above embodiments is that:

[0056] As a preferred option, such as Figure 5 As shown, the frame portion 1 includes a first side plate 101 and a second side plate 102 arranged laterally opposite each other, and a top plate 104 and a bottom plate 105 arranged vertically opposite each other, which together form a frame structure. It also includes a third side plate 103 that completely seals off the longitudinal side of the frame structure away from the brick portion 2. Thus, the frame portion 1 forms an internal space, such as... Figure 1 As shown, the internal space is divided into a first part 11, a second part 12 and a third part 13 in a longitudinal direction. The first part 11 forms the heating space, the second part 12 forms the second installation space for accommodating the brick part 2, and the third part 13 forms the third installation space for accommodating the wire. The installation part 302 of the heating unit 3 extends into the third installation space to be electrically connected to the wire.

[0057] In this embodiment, the frame part 1 is designed to longitudinally connect and arrange three parts, which are used to house the heating unit 3, the brick part 2, and the wires respectively. The structural layout is reasonable and clear. Moreover, each side plate of the frame part 1 adopts a whole plate structure, and the brick part 2 is housed in the enclosed outer frame. The structure has high strength and good stability.

[0058] As a preferred option, such as Figure 1 As shown, the longitudinal dimension of the second side plate 102 is adapted to the longitudinal dimension of the first part 11, and the brick part 2 is abutted and limited by the second side plate 102; the lateral end of the bottom plate 105 and the lateral end of the third side plate 103 in the first part 11 together with the second side plate 102 form the pointed corner A110.

[0059] As a preferred option, such as Figure 5 As shown, the longitudinal dimensions of the first side plate 101, the top plate 104, and the bottom plate 105 cover the sum of the longitudinal dimensions of the first part 11, the second part 12, and the third part 13.

[0060] Example 3

[0061] The components in this embodiment that are the same as or corresponding to those in the above embodiments are referred to by the same reference numerals as those in the above embodiments. For the sake of simplicity, only the differences between this embodiment and the above embodiments are described below. The difference between this embodiment and the above embodiments is that:

[0062] As a preferred option, such as Figure 4 As shown, the heating unit 3 is configured as a split structure, comprising a first heating element 31 that matches the pointed corner A110 and at least one second heating element 32; both the first heating element 31 and the second heating element 32 include a working part 301 and a mounting part 302 connected to each other, as shown in the figure. Figure 7 As shown, the brick body part 2 has an installation groove A211, and the installation part 302 is horizontally installed in the installation groove A211.

[0063] In this embodiment, the heating unit 3 is set as a split structure, which not only fully adapts to the shape of the irregular heating space for arrangement and is suitable for customized design for edge bricks of different sizes, but also facilitates the replacement of individual heating elements, saving costs.

[0064] Preferably, the working portion 301 of the first heating element 31 has the pointed corner portion B310.

[0065] Preferably, the second heating element 32 is arranged side by side with the first heating element 31.

[0066] Preferably, the working portions 301 of the first heating element 31 and the second heating element 32 are both arranged vertically; the working portion 301 of the second heating element 32 is configured as a U-shaped structure.

[0067] As a preferred implementation method, such as Figure 4 As shown, the mounting groove A211 is configured as a through hole structure that penetrates the brick 22 of the brick body portion 2.

[0068] As another preferred implementation, such as Figure 9 As shown, the mounting groove A211 is configured as a semi-groove structure opened on the upper surface of the brick body 22.

[0069] In this embodiment, the mounting groove A211 is configured as a through-hole structure built into the brick 22 through the brick part 2 or a semi-groove structure opened on the upper surface of the brick 22, so as to support and effectively accommodate the straight rod-shaped mounting part 302. Typically, the heating unit 3 uses silicon carbide rods or silicon molybdenum rods. The structure of this embodiment can effectively prevent the silicon carbide rods or silicon molybdenum rods from being worn down and falling off, causing electrical conductivity and affecting the safety of personnel and equipment.

[0070] As a preferred option, such as Figure 9 As shown, a limiting support 5 is provided in the heating space, and the bottom of the working part 301 is limited and installed in the support groove 50 of the limiting support 5 to obtain vertical support and longitudinal limitation.

[0071] In this embodiment, the heating unit 3 is positioned and installed using both the mounting groove A211 and the support groove 50, thereby ensuring the stable installation of the heating unit 3 within the retaining brick, improving its service life and production safety.

[0072] Example 4

[0073] The components in this embodiment that are the same as or corresponding to those in the above embodiments are referred to by the same reference numerals as those in the above embodiments. For the sake of simplicity, only the differences between this embodiment and the above embodiments are described below. The difference between this embodiment and the above embodiments is that:

[0074] As a preferred option, such as Figure 1 As shown, the portion of the brick body 2 that is adapted to the calendering roll has a pointed corner C210, and the pointed corner C210 has the same size as the pointed corner A110.

[0075] In this embodiment, the height of the side of the sharp corner A110 and the sharp corner C210 that directly engages with the calender roll is consistent, and the structure of this embodiment is adapted to calender roll structures that do not require bushings.

[0076] Example 5

[0077] The components in this embodiment that are the same as or corresponding to those in the above embodiments are referred to by the same reference numerals as those in the above embodiments. For the sake of simplicity, only the differences between this embodiment and the above embodiments are described below. The difference between this embodiment and the above embodiments is that:

[0078] As a preferred option, such as Figure 9 As shown, the portion of the brick body 2 that is adapted to the calender roll has a pointed corner C210. ​​The size of the pointed corner C210 is smaller than the size of the pointed corner A110, thereby forming a step between the two that is adapted to install the calender roll bushing.

[0079] In this embodiment, the side heights of the sharp corner portions A110 and C210 that directly engage with the calender roll are misaligned, and the structure of this embodiment is adapted to the calender roll structure with bushings.

[0080] Work process:

[0081] When using the heating unit 3, first open the top plate 104 of the frame part 1, then move the brick part 2 away from the working surface of the frame part 1 longitudinally so that the working part 301 of the heating unit 3 is moved out of the sharp corner A110. Then, remove the brick part 2 by continuing to move it longitudinally or by vertically lifting it so that the heating unit 3 installed on it can be replaced.

[0082] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A baffle member for the overflow outlet of a furnace in a rolled glass forming process, characterized in that, The device includes a frame portion (1) and a brick portion (2) installed within the frame portion (1). A heating space is formed between the longitudinal working surface side of the frame portion (1) and the brick portion (2). The portion of the heating space that is adapted to the upper and lower calendering rolls has a sharp corner A (110). A heating unit (3) is installed on the brick portion (2). At least the working part (301) of the heating unit (3) is accommodated within the heating space, and the shape of the working part (301) is conformally arranged to cover the heating space. The brick portion (2) is longitudinally movable relative to the frame portion (1) so that the working part (301) of the heating unit (3) moves out of the sharp corner A (110).

2. A baffle member for the overflow outlet of a furnace in a rolled glass forming process according to claim 1, characterized in that, The brick body part (2) includes a brick base frame (21) and a brick body (22) installed in the brick base frame (21), wherein the brick base frame (21) is connected to an external drive mechanism to drive the brick body part (2) to move longitudinally, and the heating unit (3) is installed on the brick body (22) and its working part (301) has a pointed corner part B (310) that conforms to the shape of the pointed corner part A (110) and the pointed corner part B (310) extends into the pointed corner part A (110).

3. A baffle member for the overflow outlet of a furnace in a rolled glass forming process according to claim 2, characterized in that, The frame part (1) and the brick base frame (21) are both made of alloy frames, and the brick body (22) is made of refractory brick.

4. A baffle member for the overflow outlet of a furnace in a rolled glass forming process according to claim 2, characterized in that, The brick base frame (21) accommodates at least the lower part of the brick body (22), and includes side plates A (201) and B (202) arranged laterally opposite each other and side plates C (203) and D (204) arranged longitudinally opposite each other, and the four together form a frame structure, and also includes a base plate (205) connected to the bottom of the frame structure.

5. A baffle member for the overflow outlet of a furnace in a rolled glass forming process according to claim 1, characterized in that, The frame part (1) includes a first side plate (101) and a second side plate (102) arranged laterally opposite each other, and a top plate (104) and a bottom plate (105) arranged vertically opposite each other, which together form a frame structure. It also includes a third side plate (103) that completely seals the longitudinal side of the frame structure away from the brick part (2). Thus, the frame part (1) forms an internal space, which is divided into a first part (11), a second part (12) and a third part (13) in the longitudinal direction. The first part (11) forms the heating space, the second part (12) forms the second installation space for accommodating the brick part (2) and the third part (13) forms the third installation space for accommodating the wire. The installation part (302) of the heating unit (3) extends into the third installation space to be electrically connected to the wire.

6. A baffle member for the overflow outlet of a furnace in a rolled glass forming process according to claim 5, characterized in that, The longitudinal dimension of the second side plate (102) is adapted to the longitudinal dimension of the first part (11), and the brick part (2) is in contact with and limited by the second side plate (102); the horizontal end of the bottom plate (105) and the horizontal end of the third side plate (103) in the first part (11) together with the second side plate (102) form the sharp corner A (110).

7. A baffle member for the overflow outlet of a furnace in a rolled glass forming process according to any one of claims 1-6, characterized in that, The heating unit (3) is configured as a split structure, which includes a first heating element (31) that matches the pointed corner A (110) and at least one second heating element (32); the first heating element (31) and the second heating element (32) each include a working part (301) and an installation part (302) connected to each other, and an installation groove A (211) is provided on the brick part (2), and the installation part (302) is horizontally installed in the installation groove A (211).

8. A baffle member for the overflow outlet of a kiln in a rolled glass forming process according to claim 7, characterized in that, The mounting groove A (211) is configured as a through hole structure built into the brick body (22) that penetrates the brick body part (2) or as a semi-groove structure opened on the upper surface of the brick body (22); The heating space is provided with a limiting support (5), and the bottom limit of the working part (301) is installed in the support groove (50) of the limiting support (5) to obtain vertical support and longitudinal limitation.

9. A baffle member for the overflow outlet of a furnace in a rolled glass forming process according to any one of claims 1-6, characterized in that, It also includes a temperature measuring component (4) installed on the brick body part (2), the brick body part (2) having an installation groove B (212), the temperature measuring component (4) being installed in the installation groove B (212) and its working end extending into the heating space.

10. A baffle member for the overflow outlet of a furnace in a rolled glass forming process according to any one of claims 1-5, characterized in that, The brick portion (2) that is adapted to the calender roll has a pointed corner C (210), the pointed corner C (210) having the same size as the pointed corner A (110); or the size of the pointed corner C (210) being smaller than the size of the pointed corner A (110), thereby forming a step between the two that is adapted to install the calender roll bushing.

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