CN216459856U - Roller and coating machine - Google Patents

Abstract

The utility model relates to a roller and coating machine, the roller includes the main part, graduation part and air exhaust device, the main part has a plurality of cavitys, and the cavity is provided with first through-hole and second through-hole respectively, the graduation part has the third through-hole, the third through-hole is used for communicating with first through-hole, air exhaust device is used for communicating with the third through-hole and bleeds, wherein the main part can rotate for the graduation part, when first through-hole and third through-hole intercommunication, air exhaust device draws the air of the cavity that corresponds with first through-hole through the third through-hole, the gas pressure in the corresponding cavity reduces, adsorb the pole piece through the second through-hole that corresponds, improve the tension that the pole piece receives, reduce the possibility that the pole piece produced the fold, and the roller is when drawing the pole piece, only partial cavity is bled, the cost of bleeding has been reduced in comparison in whole.

Description

Roller and coating machine

Technical Field

The application relates to the technical field of battery manufacturing, in particular to a roller and a coating machine.

Background

The coating machine is needed in battery pole piece processing, the roller of the coating machine is used for drawing the pole piece, the influence of the difference of the technological varieties and the temperature of the pole piece is needed to be considered during processing, the compression degree of the roller is frequently adjusted, so that the problems of slipping, wrinkling and the like of the pole piece caused by the fact that transverse tension cannot be released are reduced, the manual maintenance cost is high, and meanwhile, the cost of vacuumizing the current vacuum adsorption roller is high.

SUMMERY OF THE UTILITY MODEL

The application provides a roller and coating machine for the human cost is high and the problem that the evacuation is with high costs when solving and pull pole piece.

The embodiment of the application provides a roller, be used for the coating machine, the roller includes the main part, graduation piece and air exhaust device, the main part has a plurality of cavitys, each cavity is provided with first through-hole and second through-hole respectively, the graduation piece has the third through-hole, the third through-hole is used for and first through-hole intercommunication, air exhaust device and third through-hole intercommunication, wherein, the main part can rotate for the graduation piece, when the main part rotates to first through-hole and third through-hole intercommunication, air exhaust device is used for taking out the air of the cavity that corresponds with first through-hole through the third through-hole, the second through-hole is used for adsorbing the pole piece. The main part rotates around the axis of the roller and is used for drawing the pole piece, the main part rotates relative to the indexing part, and when the third through hole is communicated with the first through hole, the air pumping device pumps out air in the cavity corresponding to the first through hole through the third through hole, so that at least part of the main part is pumped out, the air pressure of the corresponding cavity is reduced, and the pole piece is adsorbed through the second through hole. Therefore, the tension borne by the pole piece is improved, the pole piece is unfolded, the possibility of wrinkles generated on the pole piece is reduced, the roller only exhausts air to a part of the cavity when adsorbing the pole piece, and the air exhaust cost is reduced.

In a possible embodiment, the plurality of cavities are arranged around the axis of the roller, one side of the main body portion has a first end surface and the other side has a second end surface along the direction of the axis of the roller, at least one of the first end surface and the second end surface is provided with a first through hole, and the index member is located at the side of the main body portion provided with the first through hole. The first through hole is at least arranged on one of the first end face and the second end face, when the main body portion rotates, the third through hole of the dividing piece is matched with different first through holes conveniently, and different cavities are pumped, so that pole pieces can be adsorbed only by pumping partial cavities, and the pumping cost is reduced.

In a possible embodiment, the third through hole communicates with a plurality of first through holes at the same time. Can bleed simultaneously to a plurality of first through-holes through the third through-hole, along with the axis rotation around the roller of main part, the third through-hole can communicate with different first through-holes. The gas pressure of the corresponding cavities is reduced, the adsorption area and the adsorption force to the pole piece are increased, and the stability of the pole piece adsorption is improved.

In one possible embodiment, the third through hole extends in the circumferential direction of the first end face or the second end face. The third through holes may be arc-shaped, the main body portion rotates relative to the index member along the axis of the roller, and the third through holes extend in the circumferential direction of the first end surface or the second end surface so that the third through holes are connected with different first through holes when the main body portion rotates.

In a possible implementation, the central angle corresponding to the third through hole is equal to the wrap angle formed by the contact of the pole piece and the main body part. The central angle corresponding to the arc part where the pole piece and the main body part are contacted with each other is a wrap angle, the third through hole extends along the circumferential direction of the first end surface or the second end surface to form an arc shape, the corresponding central angle is the same as the central angle corresponding to the wrap angle, so that the contact area of the cavity corresponding to the first through hole corresponding to the third through hole is the same as that of the pole piece, and the contact part of the pole piece and the main body part can be adsorbed.

In a possible embodiment, the dimension of the third through hole in the diameter direction of the roller is equal to the diameter of the first through hole. The third through hole is used for communicating with first through hole, and the size of third through hole along the diameter direction of roller equals the diameter of first through hole, makes third through hole and first through hole closely cooperate, if the third through hole is too big, then probably increase the possibility of leaking gas, if the third through hole undersize, air exhaust efficiency can reduce.

In one possible embodiment, the indexing element has a sealing ring which is arranged around the third through-opening and which is mounted between the indexing element and the body part. The sealing ring is arranged around the third through hole, and is arranged between the dividing piece and the main body part when the third through hole is connected with the first through hole. The sealing ring is used for improving the air tightness of the connecting position, reducing the possibility that air enters the cavity, and enhancing the adsorption force of the second through hole on the pole piece.

In a possible embodiment, the main body is provided with a mounting portion which projects relative to the main body in the direction of the axis of the roller. The mounting portions are portions protruding from the first end surface and the second end surface, respectively, in the axial direction of the roller, and may be cylindrical. The installation part is used for installing the roller on equipment, and the main part of being convenient for rotates and draws the pole piece.

In one possible embodiment, the roller comprises a sleeve having a plurality of ventilation holes in a surface thereof, the sleeve being sleeved to the main body portion. The sleeve can be made of rubber, is sleeved on the main body part and is in contact with the pole piece when the main body rolls to draw the pole piece. The sleeve can provide great frictional force, and the sleeve surface is provided with a plurality of air vents, and air vent and second through-hole intercommunication for adsorb the pole piece.

The present application provides a coater comprising a roll, wherein the roll is any one of the rolls described above.

The utility model relates to a roller and coating machine, the roller includes the main part, graduation part and air exhaust device, the main part has a plurality of cavitys, and the cavity is provided with first through-hole and second through-hole respectively, the graduation part has the third through-hole, the third through-hole is used for communicating with first through-hole, air exhaust device is used for communicating with the third through-hole and bleeds, wherein the main part can rotate for the graduation part, when first through-hole and third through-hole intercommunication, air exhaust device draws the air of the cavity that corresponds with first through-hole through the third through-hole, the gas pressure in the corresponding cavity reduces, adsorb the pole piece through the second through-hole that corresponds, improve the tension that the pole piece receives, reduce the possibility that the pole piece produced the fold, and the roller is when drawing the pole piece, only partial cavity is bled, the cost of bleeding has been reduced in comparison in whole.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

FIG. 1 is a schematic structural view of a roll provided herein;

FIG. 2 is a cross-sectional view of a roll provided herein;

fig. 3 is a schematic structural view of an index provided in the present application.

Reference numerals:

1-a body portion;

11-a cavity;

111-a first via;

112-a second via;

12-a first end face;

13-a second end face;

14-a mounting portion;

2-an index;

21-third via hole.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms of art "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal" and "top" are used for the description of the embodiments of the present application "

The references to "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings and are only for convenience in describing the embodiments of the present application and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

The coating machine is an important device in battery manufacturing, after a pole piece is dried by an oven, when the pole piece passes through a traction roller and a glue compression roller, the process and variety difference of the pole piece and the influence of the baking temperature and the environmental temperature on the pole piece need to be considered, the current coating machine needs to frequently adjust the compression degree of the glue compression roller according to the process variety difference and the influence of the temperature of the pole piece so as to avoid the slipping and the wrinkling of the pole piece, in the process of frequently adjusting the compression degree of the glue compression roller, the technical requirement on operators is high on one hand, the glue compression roller is seriously abraded due to the tension difference between the front section and the rear section after being used for a long time, the long-term maintenance cost is high, and the maintenance cost and the labor cost of the glue compression roller are finally improved. Can use the vacuum adsorption roller to improve these problems at present, the hole that is used for the evacuation is opened along the length direction of whole roller to current vacuum adsorption roller to whole steel roller evacuation through the terminal flange of bleeding of steel roller, can realize cutting off the tension of pole piece, reduce the risk that the pole piece appears crumpling. However, in actual production, the pole piece and the vacuum adsorption roller have a certain wrap angle, and the vacuumizing holes outside the wrap angle cannot be utilized, so that the vacuumizing cost is increased.

In order to solve the problems of pole piece slipping and wrinkling when the pole piece is taken out of an oven and passes through a traction steel roller and a rubber compression roller in the coating process and relieve the problems of high maintenance cost and high labor cost, the roller can be designed into a vacuum adsorption roller to replace the steel roller and the rubber compression roller to be used as a tension isolating mechanism, through holes for vacuumizing are distributed in the length direction of the roller of the vacuum adsorption roller, the position of an indexing vacuum disc is fixed, when the vacuum adsorption roller passes through the indexing vacuum disc in the rotating process, the partial holes in the vacuum adsorption roller can be vacuumized, other holes cannot be vacuumized, the vacuum adsorption of the orientation angle of the pole piece is finally realized, the tension isolating of the pole piece is realized, the risk of wrinkling of the pole piece is reduced, the air exhaust cost is reduced, the vacuum adsorption roller of the orientation angle can be effectively adopted according to the wrap angle between the pole piece and the steel roller in the actual use process, the transverse tension of the pole piece after the pole piece is taken out of the drying oven is improved, so that the pole piece is transversely unfolded, and the wrinkling risk is improved.

The roller disclosed in the embodiment of the application can be used in the field of lithium battery production and manufacturing, such as a lithium battery anode coating process, and comprises belt roller type equipment applied in other fields.

For convenience of description, the following embodiments will be described by taking a belt roller apparatus as an example of a coater according to an embodiment of the present application.

The embodiment of the application provides a coating machine, and the coating machine comprises a roller.

The coating machine is mainly used for surface coating process production of films, paper, lithium batteries and the like, and the equipment is used for coating a layer of glue, paint or ink with a specific function on a coiled substrate, drying and then rolling. The multifunctional coating head can realize the generation of surface coating in various forms, the winding and unwinding of the coating machine are all provided with a full-speed automatic film connecting mechanism, and a controller is used for program tension closed-loop automatic control.

The coating machine can actively unreel, the automatic tension control of the reeling and unreeling floating roller is reliable in use, the surface coupon is smooth, the coating mode can adopt transfer coating, the coating mode of metering by the metering roller is uniform and stable, the electrical control of the whole machine of the coating machine adopts the centralized control of a controller computer, the operation of a human-computer interface is visual, simple and convenient, the split control box is matched with the operation of the human-computer interface, the concentration and coordination of the machine are ensured, the occupied area of the coating machine is small, and the space is saved.

As shown in fig. 1 and 2, the present embodiment provides a roller for a coating machine, the roller includes a main body portion 1, an index member 2, and an air extracting device (not shown in the figure), the main body portion 1 has a plurality of cavities 11, each cavity 11 is respectively provided with a first through hole 111 and a second through hole 112, the index member 2 has a third through hole 21, the third through hole 21 is used for communicating with the first through hole 111, and the air extracting device is communicated with the third through hole 21, wherein the main body portion 1 can rotate relative to the index member 2, when the main body portion 1 rotates to communicate with the first through hole 111 and the third through hole 21, the air extracting device is used for extracting air of the cavity 11 corresponding to the first through hole 111 through the third through hole 21, and the second through hole 112 is used for adsorbing a pole piece.

The main body part 1 rotates around the axis of the roller and is used for drawing the pole piece, the main body part 1 rotates relative to the dividing piece 2, when the third through hole 21 is communicated with the first through hole 111, the air suction device sucks air in the cavity 11 corresponding to the first through hole 111 through the third through hole 21, at least partial air suction of the main body part 1 is realized, the air pressure of the corresponding cavity 11 is reduced, and therefore the pole piece is adsorbed through the second through hole 112.

Thereby improve the tension that the pole piece received, make the pole piece expand, reduce the pole piece and produce the possibility of fold, the roller only bleeds to partial cavity 11 when adsorbing the pole piece, has reduced the cost of bleeding, can select the roller of suitable size and adjust the volume size of cavity 11 according to the size of pole piece during the use, also can adjust the tightness degree of pole piece through the relative position of adjustment roller and pole piece.

As shown in fig. 1 and 2, in one possible embodiment, a plurality of cavities 11 are arranged around the axis of the roller, one side of the main body portion 1 has a first end surface 12 and the other side has a second end surface 13 along the direction of the axis of the roller, at least one of the first end surface 12 and the second end surface 13 is provided with a first through hole 111, and the index member 2 is located on the side of the main body portion 1 provided with the first through hole 111.

The first through holes 111 are provided in at least one of the first end surface 12 and the second end surface 13, and the third through holes 21 of the index member 2 are easily engaged with different first through holes 111 when the main body portion 1 is rotated.

The air pressure in the partial cavity 11 is reduced by pumping air to different cavities 11, so that the pole piece can be adsorbed only by pumping air to the partial cavity 11, and the air pumping cost is reduced.

As shown in fig. 3, in one possible embodiment, the third through hole 21 can communicate with a plurality of first through holes 111 at the same time.

The plurality of first through holes 111 can be simultaneously evacuated through the third through holes 21, so that the plurality of cavities 11 corresponding to the plurality of first through holes 111 are evacuated, the gas pressure in the plurality of cavities 11 is reduced, and the third through holes 21 can communicate with different first through holes 111 as the main body portion 1 rotates about the axis of the roller.

The gas pressure of the corresponding cavities 11 is reduced, so that the second through holes 112 corresponding to the cavities 11 adsorb the pole pieces, the adsorption area and the adsorption force of the pole pieces are increased, and the stability of the adsorption of the pole pieces is improved.

In one possible embodiment, as shown in fig. 3, the third through hole 21 extends in the circumferential direction of the first end face 12 or the second end face 13.

The third through hole 21 may be an arc, the arc extends along the circumferential direction of the first end surface 12 or the second end surface 13, the circle center of the corresponding circle of the arc coincides with the circle center of the first end surface 12, and the third through hole 21 also rotates along with the main body portion 1 along with the rotation of the main body portion 1.

The main body part 1 rotates relative to the index part 2 along the axis of the roller, the third through holes 21 extend along the circumferential direction of the first end surface 12 or the second end surface 13, so that the third through holes 21 are connected with different first through holes 111 when the main body part 1 rotates, when the matching number of the third through holes 21 and the first through holes 111 is minimum, the number of the cavities 11 to be pumped is also minimum, and at the moment, the cavities 112 corresponding to the cavities 11 can also generate enough adsorption force.

In a possible embodiment, the central angle corresponding to the third through hole 21 is equal to the wrap angle formed by the contact of the pole piece with the main body portion 1.

The central angle corresponding to the arc part where the pole piece and the main body part 1 contact with each other is a wrap angle, the third through hole 21 extends in the circumferential direction of the first end surface 12 or the second end surface 13 to be in an arc shape, and the corresponding central angle is the same as the central angle corresponding to the wrap angle.

The contact area of the cavity 11 corresponding to the first through hole 111 corresponding to the third through hole 21 is the same as that of the pole piece, so that the contact part of the pole piece and the main body part 1 can be adsorbed.

In a possible embodiment, as shown in fig. 3, the dimension of the third through hole 21 in the diameter direction of the roller is equal to the diameter of the first through hole 111.

The dimension of the third through holes 21 in the diameter direction of the roller may be equal everywhere and equal to the diameter of the second through holes 112, the third through holes 21 being able to communicate with the first through holes 111 when the main body 1 rotates relative to the index plate 2.

The third through hole 21 is used for communicating with the first through hole 111, the size of the third through hole 21 in the diameter direction of the roller is equal to the diameter of the first through hole 111, so that the third through hole 21 and the first through hole 111 can be tightly matched, if the third through hole 21 is too large, the possibility of air leakage can be increased, if the third through hole 21 is too small, the air exhaust efficiency can be reduced, when the size of the third through hole 21 in the diameter direction of the roller is equal to the diameter of the first through hole 111, the third through hole 21 can be communicated with the first through hole 111, the area of the third through hole 21 is smaller, the risk of air leakage cannot be increased, and the air exhaust efficiency is ensured.

In one possible embodiment, the index 2 has a sealing ring which is arranged around the third through opening 21 and which is mounted between the index 2 and the body 1.

The sealing ring is arranged around the third through hole 21, when the third through hole 21 and the first through hole 111 are connected, the sealing ring is arranged between the dividing part 2 and the main body part 1, the sealing ring can be made of elastic materials, and can deform and cling to the dividing part 2 and the main body part 1 under the extrusion of the dividing part 2 and the main body part 1, so that better air tightness is achieved.

The sealing ring is used for improving the air tightness of the connecting position of the dividing part 2 and the main body part 1, when the cavity 11 is pumped through the third through hole 21, the possibility that air enters the cavity 11 is reduced, the air pumping efficiency is improved, the air pressure in the cavity 11 can be quickly reduced, and the adsorption force of the second through hole 112 on the pole piece is enhanced.

As shown in fig. 1, in one possible embodiment, the main body 1 is provided with a mounting portion 14, the mounting portion 14 projecting relative to the main body 1 in the direction of the axis of the roller.

The mounting portions 14 are portions projecting from the first end face 12 and the second end face 13, respectively, in the axial direction of the roller, and the mounting portions 14 may be cylindrical.

The mounting portion 14 is used to mount the roller to the coater and enables the roller to rotate relative to the coater, facilitating rotation of the main body portion 1 to draw the pole pieces.

In a possible embodiment, the roller comprises a sleeve having a plurality of ventilation holes in its surface, which sleeve is sleeved on the body portion 1.

The sleeve can be the rubber material, and the sleeve cup joints in main part 1, when the main part rolls and draws the pole piece, sleeve and pole piece contact, and rubber has certain elasticity, and thereby after with pole piece contact atress, take place deformation and form arcwall face and pole piece contact promotion skid resistance ability.

The sleeve can provide great frictional force, and the sleeve surface is provided with a plurality of air vents, and air vent and second through-hole 112 intercommunication for adsorb the pole piece, when maintaining the roller, thereby can dismantle sleeve surface and air vent, reduce the maintenance cost with the sleeve.

The application provides a roller comprising a main body portion 1, an index member 2 and an air extraction device, the main body portion 1 having a plurality of cavities 11, the cavity 11 is respectively provided with a first through hole 111 and a second through hole 112, the dividing piece 2 is provided with a third through hole 21, the third through hole 21 is used for being communicated with the first through hole 111, the air extracting device is used for being communicated with the third through hole 21 and extracting air, in which the body portion 1 is able to rotate relative to the index 2, when the first through hole 111 and the third through hole 21 are communicated, the air exhausting means exhausts the air of the chamber 11 corresponding to the first through hole 111 through the third through hole 21, the pressure of the gas in the corresponding cavity 11 is reduced, the pole piece is absorbed through the corresponding second through hole 112, the tension applied to the pole piece is improved, the possibility of wrinkles generated on the pole piece is reduced, and when the roller draws the pole piece, only part of the cavity 11 is pumped, and compared with the whole pumping, the pumping cost is reduced.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (10)

1. A roll for a coater, the roll comprising:

the main body part (1), the main body part (1) is provided with a plurality of cavities (11), and each cavity (11) is provided with a first through hole (111) and a second through hole (112);

an index (2), said index (2) having a third through hole (21), said third through hole (21) being for communication with said first through hole (111);

the air extracting device is communicated with the third through hole (21);

the main body part (1) can rotate relative to the dividing piece (2), when the main body part (1) rotates to the first through hole (111) and the third through hole (21) are communicated, the air extracting device is used for extracting air of the cavity (11) corresponding to the first through hole (111) through the third through hole (21), and the second through hole (112) is used for adsorbing a pole piece.

2. A roll according to claim 1, characterized in that a plurality of said cavities (11) are arranged around the axis of the roll, that in the direction of the axis of the roll the main body part (1) has a first end surface (12) on one side and a second end surface (13) on the other side, that at least one of the first end surface (12) and the second end surface (13) is provided with said first through holes (111), and that the indices (2) are located on the side of the main body part (1) where the first through holes (111) are provided.

3. A roller according to claim 2, characterized in that said third through holes (21) are able to communicate simultaneously with a plurality of said first through holes (111).

4. A roll according to claim 2, characterized in that the third through holes (21) extend in the circumferential direction of the first end surface (12) or the second end surface (13).

5. A roller according to claim 4, characterized in that the third through hole (21) has a corresponding central angle equal to the wrap angle of the pole piece in contact with the main portion (1).

6. A roller according to claim 1, characterized in that the dimension of the third through hole (21) in the direction of the diameter of the roller is equal to the diameter of the first through hole (111).

7. A roll according to any one of claims 1-6, characterized in that the indices (2) have a sealing ring, which is arranged around the third through hole (21) and which is mounted between the indices (2) and the body part (1).

8. A roll according to any one of claims 1-6, characterized in that the main body (1) is provided with a mounting (14), which mounting (14) projects in the direction of the roll axis relative to the main body (1).

9. A roll according to any of claims 1-6, characterized in that it comprises a sleeve, the sleeve surface having a plurality of ventilation holes, the sleeve being journalled in the body part (1).

10. A coater comprising a roll, wherein the roll is the roll of any one of claims 1 to 9.

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