A roll gap adjustment mechanism and calendering apparatus

Abstract

The utility model discloses a kind of roll gap adjusting mechanism and calendering equipment, roll gap adjusting mechanism is applied to adjust the spacing between the bearing seat of two adjacent groups of roller groups, including wedge block and adjusting piece;The two sides of bearing seat in first direction are first side and second side respectively, and the first side and the second side of adjacent two bearing seats are oppositely arranged;The side wall of first side is equipped with arc groove;One end of adjusting piece is movably adapted and embedded in arc groove, the other end protrudes to the outside of arc groove and has matching surface on end face;Wedge block is located between two adjacent bearing seats, and is driven by driving piece and moves along second direction;One side of wedge block is abutted by plane and the side wall of the second side of one of bearing seat, and the other side is abutted by matching surface on the first side of other bearing seat through inclined plane. Solve the problem that the inclined plane of the inclined wedge of existing roll gap adjusting mechanism is point or line contact with bearing seat, and the carrying capacity is poor, very easy to wear, affect service life.

Description

Technical Field

[0001] This utility model relates to the field of dry calendering film forming technology, specifically to a roll gap adjustment mechanism and calendering equipment. Background Technology

[0002] In the dry calendering process of film, the roller sets play a decisive role in the calendering effect. The precise adjustment of the roller gap between adjacent roller sets directly affects core quality indicators such as the thickness accuracy and surface flatness of the calendered film. Dry calendering equipment typically includes multiple roller sets spaced apart on a frame. Each roller set usually consists of calendering rolls and bearing seats. The two ends of the calendering rolls are slidably mounted on the frame via bearing seats. A roller gap adjustment mechanism is generally installed between the bearing seats of adjacent roller sets to adjust the distance between the two adjacent bearing seats, thereby adjusting the roller gap size.

[0003] In related technologies, roll gap adjustment mechanisms generally include a wedge and a drive device. The wedge is located between two adjacent bearing seats. The wedge is displaced under the drive device, thereby changing the roll gap size between adjacent calendering rolls. However, the inclined surface of the wedge usually abuts against the bottom corner of the bearing seat. The inclined surface of the wedge and the bearing seat usually have point or line contact. This contact form has poor load-bearing capacity and is prone to rapid wear, or even damage to the bearing seat, affecting its service life. Utility Model Content

[0004] This invention provides a roll gap adjustment mechanism and a calendering equipment, which solves the problem that in the existing roll gap adjustment mechanism, the inclined surface of the wedge and the bearing seat are usually in point or line contact during the adjustment process. This contact form has poor load-bearing capacity, is prone to rapid wear, and may even cause damage to the bearing seat, affecting the service life.

[0005] In a first aspect, this utility model provides a roll gap adjustment mechanism, which is used to adjust the distance between the bearing seats of two adjacent sets of rolls to adjust the roll gap size. The roll gap adjustment mechanism includes a wedge block and an adjustment component.

[0006] The bearing housing has a first side and a second side on two sides in the first direction, and the first side and the second side of two adjacent bearing housings are arranged opposite to each other; the side wall of the first side is provided with an arc-shaped groove; one end of the adjusting member is movably adapted to be embedded in the arc-shaped groove, and the other end protrudes to the outside of the arc-shaped groove and has a mating surface on the end face;

[0007] The wedge block is located between two adjacent bearing seats and is driven to move along the second direction by a drive member; one side of the wedge block abuts against the side wall of the second side of one of the bearing seats through a plane, and the other side abuts against the mating surface on the first side of the other bearing seat through an inclined surface; the first direction is perpendicular to the second direction.

[0008] In one optional embodiment, the adjusting component includes an arc-shaped mounting bracket, a first roller rolling block, and a fastener. The arc-shaped mounting bracket has an arc-shaped side and a flat side on its two sides, respectively. The arc-shaped side is movably fitted into the arc-shaped groove, and the flat side protrudes to the outside of the arc-shaped groove. The arc-shaped side is provided with a through hole, through which the fastener passes and connects to the arc-shaped groove, and the fastener and the through hole are in clearance fit. The flat side is provided with the first roller rolling block, which is used to form the mating surface.

[0009] In one optional embodiment, the planar side is provided with a first mounting groove, and the through hole is provided at the bottom of the first mounting groove.

[0010] In one optional embodiment, the planar side is provided with a second mounting groove, the depth of the second mounting groove being less than the depth of the first mounting groove; the first roller block is embedded in the second mounting groove and connected to the second mounting groove by screws.

[0011] In one alternative implementation, the fastener is a stud.

[0012] In one alternative embodiment, a second roller block is embedded in the sidewall of the second side of the bearing housing for contacting the plane of the wedge block.

[0013] In an alternative embodiment, a mounting plate is further included, which is connected to the bearing seat on the inclined side opposite to the wedge block;

[0014] The mounting plate is provided with a slide rail along the second direction, and the wedge block is slidably connected to the slide rail through a connecting block;

[0015] The driving component is disposed on the mounting plate and is drivenly connected to the connecting block, for driving the connecting block to move along the second direction.

[0016] In one optional embodiment, the driving component includes a lead screw and a drive motor; the lead screw is rotatably mounted on the mounting plate in a second direction; the lead screw is connected to the connecting block via a nut seat and is driven to rotate by the drive motor.

[0017] Secondly, this utility model provides a calendering apparatus, comprising:

[0018] Frame;

[0019] At least two sets of rollers are spaced apart along a first direction; each roller set includes a calendering roller and two bearing seats, and the two ends of the calendering roller are slidably connected to the frame in the first direction through the bearing seats; a roller gap adjustment mechanism is provided between the bearing seats of each two adjacent sets of rollers, and the roller gap adjustment mechanism adopts the roller gap adjustment mechanism as described in any of the first aspects.

[0020] The technical solution of this utility model has the following advantages:

[0021] 1. In this utility model, a wedge block is set between the bearing seats of two adjacent sets of rollers. The plane and inclined surface of the wedge block abut against the side wall of the first side of one bearing seat and the mating surface of the adjusting member of the second side of the other bearing seat, respectively. The wedge block is driven to move in the second direction by the driving member to adjust the distance between the two adjacent bearing seats, so as to realize the adjustment of the roller gap.

[0022] 2. In this utility model, the adjusting component is movably fitted with the arc-shaped groove on the bearing seat, and the force is transmitted through the contact between the mating surface of the adjusting component and the inclined surface of the wedge. During the adjustment process, the adjusting component can adaptably move along the arc trajectory within the arc-shaped groove as the wedge moves, ensuring that the mating surface of the adjusting component is always in close contact with the inclined surface of the wedge, maintaining a constant surface-to-surface contact state. This uniformly pushes the bearing seat to move, improving the stability and reliability of the thrust transmission generated by the wedge during the adjustment process. This makes the entire adjustment process smooth and precise, meeting the high-precision requirements for roll gap adjustment in the dry film calendering process. At the same time, it improves the overall stability and load-bearing capacity, reduces the frequency of component replacement, and increases production efficiency. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a partial structural schematic diagram of the calendering equipment provided by this utility model;

[0025] Figure 2 A schematic diagram of the roller gap adjustment mechanism provided by this utility model;

[0026] Figure 3 A schematic diagram of the connection between the adjusting component and the bearing seat provided by this utility model;

[0027] Figure 4A schematic diagram of the arc-shaped mounting bracket provided by this utility model;

[0028] Figure 5 A schematic diagram of the connection between the wedge plate and the driving component provided by this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Roller assembly; 101. Bearing housing; 102. Calendering roll; 2. Wedge block; 3. Adjusting component; 301. Arc-shaped mounting bracket; 3011. Arc-shaped side; 3012. Flat side; 302. First roller block; 303. Through hole; 304. First mounting groove; 305. Second mounting groove; 4. Arc-shaped groove; 5. Second roller block; 6. Mounting plate; 7. Slide rail; 8. Connecting block; 9. Driving component; 901. Lead screw; 902. Drive motor. Detailed Implementation

[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 element 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," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0035] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0036] According to an embodiment of the present invention, a roll gap adjustment mechanism is used to adjust the gap between the bearing seats 101 of two adjacent sets of rollers 1 to adjust the roll gap size. The roll gap adjustment mechanism includes a wedge block 2 and an adjusting member 3. The bearing seats 101 have a first side and a second side on both sides in a first direction, and the first side and the second side of two adjacent bearing seats 101 are arranged opposite to each other. The side wall of the first side is provided with an arc groove 4. One end of the adjusting member 3 is movably adapted to be embedded in the arc groove 4, and the other end protrudes to the outside of the arc groove 4 and has a mating surface on the end face. The wedge block 2 is located between two adjacent bearing seats 101 and is driven by a driving member 9 to move along a second direction. One side of the wedge block 2 abuts against the side wall of the second side of one of the bearing seats 101 through a plane, and the other side abuts against the mating surface on the first side of the other bearing seat 101 through an inclined surface. The first direction is perpendicular to the second direction.

[0037] It should be noted that the two sets of rollers 1 are spaced apart in the first direction; the two sides of the wedge block 2 have a plane and an inclined surface respectively; the plane of the wedge block 2 is parallel to the second direction.

[0038] In this embodiment, when it is necessary to adjust the gap between the two sets of rollers 1, since the wedge block 2 is located between the two bearing seats 101 of the two sets of rollers 1, and the plane of the wedge block 2 abuts against the side wall of the second side of one of the bearing seats 101, and the inclined surface of the wedge block 2 abuts against the mating surface of the adjusting member 3 on the first side of the other bearing seat 101, the wedge block 2 is driven to move along the first direction by the driving member 9. Utilizing the structural feature that the thickness of the wedge block 2 gradually increases, when the wedge block 2 moves towards the two sets of rollers 1, it pushes the two bearing seats 101 to move away from each other, thereby increasing the distance between the two bearing seats 101 and thus increasing the gap between the two sets of rollers 1; when the wedge block 2 moves away from the two sets of rollers 1, the two bearing seats 101 can move towards each other under external force. The movement of the rollers in the near direction reduces the distance between the two bearing seats 101, thereby reducing the gap between the two roller groups 1. During the adjustment process, since the adjusting component 3 is movably disposed in the arc groove 4, when the inclined surface of the wedge block 2 abuts against the mating surface of the adjusting component 3 and generates force, the adjusting component 3 can move adaptively along the arc trajectory in the arc groove 4 with the movement of the wedge block 2. This ensures that the mating surface of the adjusting component 3 is always in close contact with the inclined surface of the wedge block 2, maintaining a surface-to-surface contact state, and uniformly pushing the bearing seat 101 to move. This improves the stability and reliability of the thrust transmission generated by the wedge block 2 during the adjustment process, making the entire adjustment process smooth and precise. This meets the high precision requirements for roller gap adjustment in the dry film calendering process, while also improving the overall stability and load-bearing capacity, reducing the frequency of component replacement, and increasing production efficiency.

[0039] In one embodiment, such as Figure 3 and Figure 4 As shown, the adjusting component 3 includes an arc-shaped mounting bracket 301, a first roller rolling block 302, and a fastener. The two sides of the arc-shaped mounting bracket 301 are an arc-shaped side 3011 and a flat side 3012, respectively. The arc-shaped side 3011 is movably adapted and embedded in the arc-shaped groove 4, and the flat side 3012 protrudes to the outside of the arc-shaped groove 4. The arc-shaped side 3011 is provided with a through hole 303, through which the fastener passes and connects to the arc-shaped groove 4, and the fastener and the through hole 303 are clearance-fitted. The flat side 3012 is provided with a first roller rolling block 302, which is used to form a mating surface.

[0040] In this embodiment, by providing a through hole 303 on the arc-shaped side 3011 of the arc-shaped mounting bracket 301, the arc-shaped side 3011 of the arc-shaped mounting bracket 301 is movably fitted into the arc-shaped groove during installation. Then, a fastener passes through the through hole 303 and connects to the arc-shaped groove 4 to install the arc-shaped mounting bracket 301 in the arc-shaped groove 4. Due to the clearance fit between the fastener and the through hole 303, sufficient clearance is reserved between the fastener and the arc-shaped groove 4 during connection to facilitate the installation of the arc-shaped mounting bracket 301. 1. The arc-shaped side 3011 can move within the arc-shaped groove 4. The movement of the arc-shaped side 3011 within the arc-shaped groove 4 ensures that the mating surface remains in contact with the inclined surface of the wedge block 2 during the adjustment process. In addition, the first roller rolling block 302 abuts against the inclined surface of the wedge block 2 on the flat side 3012 of the arc-shaped mounting bracket 301, changing sliding friction into rolling friction, reducing frictional force, making the wedge block 2 move and adjust more smoothly, reducing component wear, and improving service life.

[0041] In one embodiment, such as Figure 4 As shown, the planar side 3012 is provided with a first mounting groove 304, and a through hole 303 is provided at the bottom of the first mounting groove 304.

[0042] In this embodiment, a first mounting groove 304 is provided on the planar side 3012 to reserve operating space, and the arc-shaped mounting bracket 301 is installed in the arc-shaped groove 4 by fasteners in the operating space.

[0043] In one embodiment, such as Figure 4 As shown, the planar side 3012 is provided with a second mounting groove 305, the depth of the second mounting groove 305 is less than the depth of the first mounting groove 304; the first roller rolling block 302 is embedded in the second mounting groove 305 and is connected to the second mounting groove 305 by screws.

[0044] In this embodiment, by providing a second mounting groove 305 on the flat side 3012 of the arc-shaped mounting bracket 301, during installation, the arc-shaped side 3011 of the arc-shaped mounting bracket 301 is first installed in the arc-shaped groove 4 using fasteners, and then the first roller rolling block 302 is embedded in the second mounting groove 305 and fixed in the second mounting groove 305 with screws, which facilitates installation and disassembly.

[0045] In one embodiment, the fastener is a stud.

[0046] In this embodiment, studs are used as fasteners, which facilitate installation and disassembly and improve installation efficiency.

[0047] In one embodiment, such as Figure 2 As shown, a second roller block 5 is embedded in the side wall of the second side of the bearing housing 101, which is used to abut against the plane of the wedge block 2 through the second roller block 5.

[0048] In this embodiment, by embedding a second roller block 5 on the side wall of the second side of the bearing housing 101 and abutting the plane of the wedge block 2, the side wall of the second side of the bearing housing 101 is prevented from directly contacting the plane of the wedge block 2, thus changing sliding friction into rolling friction, reducing frictional force, making the wedge block 2 move and adjust more smoothly, reducing component wear, and improving service life.

[0049] In one embodiment, such as Figure 1 , Figure 2 and Figure 5 As shown, it also includes a mounting plate 6, which is connected to a bearing seat 101 on the inclined side away from the wedge block 2; a slide rail 7 is provided on the mounting plate 6 along the second direction, and the wedge block 2 is slidably connected to the slide rail 7 through a connecting block 8; a driving component 9 is provided on the mounting plate 6 and is drivenly connected to the connecting block 8, for driving the connecting block 8 to move along the second direction.

[0050] In this embodiment, during adjustment, the connecting block 8 is driven to move on the slide rail 7 by the driving component 9, thereby driving the wedge block 2 to move in the second direction for adjustment, thereby improving the stability during movement.

[0051] Alternatively, the mounting plate 6 can be mounted on an external fixed device.

[0052] In one embodiment, such as Figure 5 As shown, the driving component 9 includes a lead screw 901 and a drive motor 902; the lead screw 901 is rotatably mounted on the mounting plate 6 in the second direction; the lead screw 901 is connected to the connecting block 8 through a nut seat and is driven to rotate by the drive motor 902.

[0053] In this embodiment, during adjustment, the lead screw 901 is driven to rotate by the drive motor 902, and then the lead screw 901 drives the connecting block 8 to move on the slide rail 7 through the nut seat, so as to realize the movement of the wedge block 2 and thereby adjust the roller gap size.

[0054] The specific working principle of the roller gap adjustment mechanism provided in this embodiment is as follows: the plane and inclined surface of the wedge block 2 respectively abut against the second roller rolling block 5 on the first side of one of the bearing seats 101 and the first roller rolling block 302 on the second side of the other bearing seat 101. When it is necessary to adjust the roller gap between the two sets of roller groups 1 to be larger, the drive motor 902 drives the lead screw 901 to rotate, and then drives the wedge block 2 to move towards the two sets of roller groups 1 through the connecting block 8. Then, the two sides of the wedge block 2 push the two bearing seats 101 to move away from each other, so that the two... The increased spacing between bearing seats 101 widens the gap between the two roller groups 1. When it is necessary to reduce the gap between the two roller groups 1, the drive motor 902 drives the lead screw 901 to rotate in the opposite direction, which in turn drives the wedge block 2 to move away from the two roller groups 1 via the connecting block 8. This allows the two bearing seats 101 to move closer to each other under external force, reducing the spacing between them and thus narrowing the gap between the two roller groups 1. The gap adjustment mechanism provided in this embodiment utilizes the arc-shaped mounting bracket 301 along the arc-shaped side 3011. The arc-shaped trajectory of the groove 4 is movably set within the groove 4, so that when the inclined surface of the wedge block 2 abuts against the first roller block 302 and generates force, the arc-shaped mounting bracket 301 can adaptively move along the arc-shaped trajectory within the groove 4 as the wedge block 2 moves. This ensures that the mating surface formed by the first roller block 302 is always in close contact with the inclined surface of the wedge block 2, maintaining a surface-to-surface contact state, and uniformly pushing the bearing seat 101 to move. This improves the stability and reliability of the thrust transmission generated by the wedge block 2 during the adjustment process, making the entire adjustment process smooth and precise. It meets the high-precision requirements for roll gap adjustment in the dry film calendering process, while improving overall stability and load-bearing capacity, reducing the frequency of component replacement, and increasing production efficiency. In addition, by using the first roller rolling block 302 and the second roller rolling block 5 to cooperate with the wedge block 2, the smoothness of wedge block 2 adjustment is improved. This solves the problem that in the existing roll gap adjustment mechanism, the inclined surface of the wedge and the bearing seat 101 are usually in point or line contact during the adjustment process. This contact form has poor load-bearing capacity, is prone to rapid wear, and may even cause damage to the bearing seat 101, affecting its service life.

[0055] According to an embodiment of the present invention, in another aspect, a calendering apparatus is also provided, comprising: a frame; at least two sets of roller groups 1, spaced apart along a first direction; each roller group 1 includes a calendering roller 102 and two bearing seats 101, the two ends of the calendering roller 102 being slidably connected to the frame in the first direction via the bearing seats 101; a set of roller gap adjustment mechanisms is provided between the bearing seats 101 of each two adjacent sets of roller groups 1, the roller gap adjustment mechanisms being the roller gap adjustment mechanisms as described in any of the first aspects.

[0056] In this embodiment, a roll gap adjustment mechanism is applied to a calendering equipment. A roll gap adjustment mechanism is provided between the bearing seats 101 of each pair of adjacent roll groups 1. The distance between two adjacent bearing seats 101 is adjusted by the roll gap adjustment mechanism, thereby causing the bearing seats 101 to drive the calendering rolls 102 to move, thus achieving adjustment of the roll gap size between the two adjacent calendering rolls 102. By employing the roll gap adjustment mechanism of any embodiment of the first aspect, the calendering equipment, with the specific structure of the roll gap adjustment mechanism being the same as that of any embodiment of the first aspect, achieves at least the same technical effect as the aforementioned roll gap adjustment mechanism. The specific principle is the same as that of any embodiment of the first aspect, and will not be described in detail here.

[0057] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A roll gap adjustment mechanism, used to adjust the distance between the bearing seats (101) of two adjacent roll groups (1) to adjust the roll gap size, characterized in that, The roll gap adjustment mechanism includes a wedge block (2) and an adjustment component (3); The bearing housing (101) has a first side and a second side on both sides in the first direction, and the first side and the second side of two adjacent bearing housings (101) are arranged opposite to each other; the side wall of the first side is provided with an arc groove (4); one end of the adjusting member (3) is movably adapted to be embedded in the arc groove (4), and the other end protrudes to the outside of the arc groove (4) and has a mating surface on the end face; The wedge block (2) is located between two adjacent bearing seats (101) and is driven by the drive member (9) to move along the second direction; one side of the wedge block (2) abuts against the side wall of the second side of one of the bearing seats (101) through a plane, and the other side abuts against the mating surface on the first side of the other bearing seat (101) through an inclined surface; the first direction is perpendicular to the second direction.

2. The roll gap adjusting mechanism according to claim 1, characterized in that, The adjusting component (3) includes an arc-shaped mounting bracket (301), a first roller rolling block (302), and a fastener. The arc-shaped mounting bracket (301) has an arc-shaped side (3011) and a flat side (3012) on its two sides. The arc-shaped side (3011) is movably fitted into the arc-shaped groove (4), and the flat side (3012) protrudes to the outside of the arc-shaped groove (4). The arc-shaped side is provided with a through hole (303), and the fastener passes through the through hole (303) and connects to the arc-shaped groove (4), and the fastener is clearance-fitted with the through hole (303). The flat side (3012) is provided with the first roller rolling block (302), which is used to form the mating surface through the first roller rolling block (302).

3. The roller gap adjustment mechanism according to claim 2, characterized in that, The planar side (3012) is provided with a first mounting groove (304), and the through hole (303) is provided at the bottom of the first mounting groove (304).

4. The roll gap adjustment mechanism according to claim 3, characterized in that, The planar side (3012) is provided with a second mounting groove (305), the depth of the second mounting groove (305) is less than the depth of the first mounting groove (304); the first roller rolling block (302) is embedded in the second mounting groove (305) and is connected to the second mounting groove (305) by screws.

5. The roller gap adjustment mechanism according to claim 2, characterized in that, The fastener is a stud.

6. The roll gap adjusting mechanism according to any one of claims 1 to 5, characterized in that, A second roller block (5) is embedded on the side wall of the second side of the bearing housing (101) for contacting the plane of the wedge block (2) through the second roller block (5).

7. The roll gap adjusting mechanism according to claim 1, characterized in that, It also includes a mounting plate (6) connected to the bearing seat (101) on the inclined side away from the wedge block (2); The mounting plate (6) is provided with a slide rail (7) along the second direction, and the wedge block (2) is slidably connected to the slide rail (7) through a connecting block (8); The driving component (9) is disposed on the mounting plate (6) and is drivenly connected to the connecting block (8) for driving the connecting block (8) to move along the second direction.

8. The roll gap adjusting mechanism according to claim 7, characterized in that, The driving component (9) includes a lead screw (901) and a drive motor (902); the lead screw (901) is rotatably mounted on the mounting plate (6) in a second direction; the lead screw (901) is connected to the connecting block (8) through a nut seat and is driven to rotate by the drive motor (902).

9. A calendering apparatus, characterized in that, include: Frame; At least two sets of rollers (1) are spaced apart along a first direction; each roller set (1) includes a calendering roller (102) and two bearing seats (101), the two ends of the calendering roller (102) are slidably connected to the frame in the first direction through the bearing seats (101); a set of roller gap adjustment mechanism is provided between the bearing seats (101) of each two adjacent sets of rollers (1), the roller gap adjustment mechanism adopts the roller gap adjustment mechanism as described in any one of claims 1 to 8.

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