CN219464344U

CN219464344U - Compression roller and rolling system

Info

Publication number: CN219464344U
Application number: CN202321028896.5U
Authority: CN
Inventors: 彭波; 康鸥; 祝维海; 邓建斌; 满彪; 刘虹岑
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-05-04
Filing date: 2023-05-04
Publication date: 2023-08-04
Anticipated expiration: 2033-05-04

Abstract

The application provides a compression roller and roll-in system relates to the battery field. The press roller has a rolling surface for rolling the workpiece. The press roll is formed with a receiving chamber therein for receiving a pressure medium to deform the roll surface at least partially outwardly. The compression roller comprises a compression roller and a connecting piece, wherein the compression roller and the connecting piece are arranged in a split mode and are connected, and the compression roller and the connecting piece jointly define a containing cavity. The pressure roller is internally provided with the accommodating cavity, and the pressure medium is introduced into the accommodating cavity, so that the rolling surface of the pressure roller is outwards slightly deformed, the thickness of a rolled workpiece is compensated, and the thickness of the workpiece is more uniform. Through manufacturing roller casting die and connecting piece respectively, link together roller casting die and connecting piece and form the compression roller to inject in the compression roller and hold the chamber, be favorable to reducing manufacturing cost, promote the yields of compression roller.

Description

Compression roller and rolling system

Technical Field

The application relates to the field of batteries, in particular to a compression roller and a rolling system.

Background

Batteries are widely applied in the field of new energy, such as electric automobiles, new energy automobiles and the like, and the new energy automobiles and the electric automobiles have become new development trends of automobile industry. The battery includes an electrode assembly, which is a component in the battery in which an electrochemical reaction occurs. The electrode assembly is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate. The uniformity of the thickness of the pole piece can affect the performance of the pole piece and thus the performance of the battery. However, the thickness uniformity of the current pole piece is poor.

Disclosure of Invention

An object of an embodiment of the present application is to provide a press roller and a press roller system, which aim to improve the problem of poor thickness uniformity of a pole piece in the related art.

In a first aspect, embodiments of the present application provide a press roll having a roll surface for rolling a workpiece, the press roll having a receiving cavity formed therein for receiving a pressure medium to at least partially deform the roll surface outwardly; the compression roller comprises a roller pressing piece and a connecting piece, wherein the roller pressing piece and the connecting piece are arranged in a split mode and are connected, and the roller pressing piece and the connecting piece jointly define the accommodating cavity.

In the technical scheme, the accommodating cavity is formed in the press roll, and the pressure medium is introduced into the accommodating cavity, so that the roll surface of the press roll can be slightly deformed outwards, the thickness of a rolled workpiece is compensated, and the thickness of the workpiece is more uniform. Through manufacturing roller casting die and connecting piece respectively, link together roller casting die and connecting piece and form the compression roller to inject in the compression roller and hold the chamber, be favorable to reducing manufacturing cost, promote the yields of compression roller.

As an alternative to the embodiment of the present application, the accommodating cavity includes a surrounding cavity, and the surrounding cavity is disposed around the axis of the pressing roller.

In the above technical scheme, through setting up the chamber of encircleing that encircles the axis setting of compression roller, to encircle the intracavity and let in pressure medium, can make the whole circumference of compression roller all outwards trace deformation, like this, at the in-process of continuous roll-in, the work piece can be better along its length direction's thickness homogeneity.

As an alternative to the embodiments of the present application, the extending direction of the encircling cavity is parallel to the axial direction of the pressing roller.

In the technical scheme, the extending direction of the surrounding cavity is parallel to the axial direction of the press roller, so that the degree of outward micro deformation of different positions of the press roller surface can be consistent; on the other hand, the processing and manufacturing are convenient, and the production cost is reduced.

As an optional technical solution of this embodiment of the present application, along the radial direction of the pressing roller, the space between the surrounding cavity and the rolling surface is L, and satisfies: l is less than or equal to 60mm.

In the technical scheme, the distance between the surrounding cavity and the rolling surface is smaller than or equal to 60mm, so that the rolling surface deforms outwards in a trace manner under the action of pressure medium. When L is more than 60mm, the distance between the surrounding cavity and the rolling surface is too large, the rolling surface is difficult to deform or the deformation is too tiny (less than 0.5 mu m) under the action of pressure medium, and the thickness of the rolled workpiece is difficult to compensate.

As an alternative technical scheme of the embodiment of the application, L is more than or equal to 40mm.

In the technical scheme, the distance between the surrounding cavity and the rolling surface is larger than or equal to 40mm, so that the compression roller has enough strength, and the risk of damage of the compression roller in the rolling process is reduced. When L is less than 40mm, the distance between the surrounding cavity and the roller surface is too small, so that insufficient strength of the roller is easily caused, and the risk of damage of the roller in the rolling process is increased.

As an alternative technical scheme of the embodiment of the application, L is more than or equal to 45mm and less than or equal to 55mm.

In the above-mentioned technical scheme, through making the interval of encircling chamber and roll-in face in 45~55mm, both be convenient for roll-in face outside micro deformation under pressure medium's effect, make the compression roller have sufficient intensity again, the compression roller is less at the risk of roll-in-process damage.

As an alternative solution of the embodiment of the present application, the encircling cavity includes an inner cavity surface and an outer cavity surface that encircle the axis of the press roll, the outer cavity surface is located at the outer side of the inner cavity surface, along the radial direction of the press roll, and the distance between the inner cavity surface and the outer cavity surface is D ₁ The method comprises the following steps: d is not less than 20mm ₁ ≤60mm。

In the technical scheme, the inner cavity surface is limited within 20-60 mm along the radial direction of the press roll and the distance between the outer cavity surface, the size of the surrounding cavity is moderate, the surrounding cavity is favorably filled with pressure medium rapidly, so that the rolling surface is enabled to deform slightly outwards, the rolling preparation time is shortened, the press roll can have enough strength, and the risk of damage of the press roll in the rolling process is reduced. When D is ₁ The size of the surrounding cavity is smaller than 20mm, the resistance of the pressure medium entering the surrounding cavity is larger, and the entering speed is slower. When D is ₁ The size of the surrounding cavity is over-large, which easily results in insufficient strength of the press roll, so that the risk of damage to the press roll during the rolling process is increased.

As an alternative technical scheme of the embodiment of the application, D is 30mm less than or equal to D ₁ ≤50mm。

In the technical scheme, the inner cavity surface is limited within 30-50 mm along the radial direction of the press roll and the distance between the outer cavity surface, the size of the surrounding cavity is moderate, the surrounding cavity is favorably filled with pressure medium rapidly, so that the rolling surface is enabled to deform slightly outwards, the rolling preparation time is shortened, the press roll can have enough strength, and the risk of damage of the press roll in the rolling process is reduced.

As an optional technical solution of the embodiment of the present application, the press roller is provided with a medium flow channel, the medium flow channel is communicated with the surrounding cavity, and one end of the medium flow channel extends to the outer surface of the press roller, so as to form a medium inlet.

In the technical scheme, the medium flow channel is arranged so that pressure medium is introduced from the medium inlet, so that the pressure medium enters the surrounding cavity, and the rolling surface of the compression roller is subjected to outward micro deformation, the thickness of the rolled workpiece is compensated, and the thickness of the workpiece is more uniform.

As an optional technical scheme of this application embodiment, the medium runner is followed the axial extension of compression roller, hold the chamber still including the intercommunication chamber, the one end of medium runner extends to the compression roller is along axial one end, the other end and the intercommunication chamber intercommunication of medium runner, the intercommunication chamber with encircle the chamber intercommunication.

In the above-described aspect, one end of the medium flow passage extends to one end of the platen roller in the axial direction to form the medium inlet on one end of the platen roller in the axial direction. Thus, the position of the medium inlet is not easy to interfere with other parts, so that pressure medium can be conveniently introduced into the medium flow passage through the medium inlet. At this time, the medium flow passage is arranged to extend along the axis of the press roller, so that the length of the medium flow passage is shorter, the pressure medium is conveniently and rapidly introduced, and the rolling preparation time is reduced. Through setting up intercommunication chamber intercommunication medium runner and encircle the chamber to be convenient for make the pressure medium who lets in the medium runner enter into encircle the intracavity, and then make the roll-in face of compression roller outwards micro deformation, thereby compensate the thickness of the work piece of roll-in, make the thickness of work piece more even.

As an alternative solution of the embodiment of the present application, the diameter of the medium flow channel is D ₂ The method comprises the following steps: d is not less than 20mm ₂ ≤60mm。

In the technical scheme, the diameter of the medium flow channel is limited to be within 20-60 mm, the size of the medium flow channel is moderate, so that the pressure medium can quickly enter the surrounding cavity through the medium flow channel, the rolling surface can be quickly deformed outwards in a micro manner, the rolling preparation time is shortened, the compression roller can have enough strength, and the risk of damage of the compression roller in the rolling process is reduced. When D is ₂ The size of the medium flow channel is smaller than 20mm, and pressure medium entersThe resistance of the medium flow passage is larger and the entering speed is slower. When D is ₂ The size of the medium flow channel is bigger than 60mm, which easily causes insufficient strength of the press roller, so that the risk of damage of the press roller is increased.

As an alternative technical scheme of the embodiment of the application, D is 30mm less than or equal to D ₂ ≤50mm。

In the technical scheme, the diameter of the medium flow channel is limited to be within 30-50 mm, the size of the medium flow channel is more suitable, pressure medium can quickly enter the surrounding cavity through the medium flow channel, so that the rolling surface can be quickly deformed outwards in a micro manner, the rolling preparation time is shortened, the strength of the pressing roller is higher, and the damage risk of the pressing roller in the rolling process is reduced.

As an optional technical solution of the embodiment of the present application, a center line of the medium flow channel coincides with an axis of the pressing roller.

In the technical scheme, when the central line of the medium flow channel is coincident with the axis of the press roller, the medium flow channel is positioned at the central position of the press roller, and the mass distribution on the press roller is uniform, so that the press roller is not easy to shake in the rotation process. In addition, the medium runner is located the central point of compression roller for after the pressure medium passes through the medium runner, can flow to the surrounding cavity from the intermediate position to both sides, be favorable to the pressure medium to fill surrounding cavity fast, in order to make the roll-in face outwards trace deformation fast, reduce the roll-in preparation time.

As an alternative solution of the embodiment of the present application, the cross section of the communicating cavity is circular, and the cross section is perpendicular to the axis of the pressing roller.

In the technical scheme, the cross section of the communicating cavity perpendicular to the axis of the press roller is circular, so that the pressure medium can flow to the surrounding cavity at 360 degrees after passing through the medium flow channel, the surrounding cavity is favorably and rapidly filled with the pressure medium, the rolling surface is conveniently and rapidly deformed outwards in a trace manner, and the rolling preparation time is reduced.

As an optional technical solution of an embodiment of the present application, along an axial direction of the press roll, the communicating cavity includes a first cavity surface and a second cavity surface that are oppositely disposed, where the first cavity surface and the second cavity surface The distance between the two cavity surfaces is D ₃ The method comprises the following steps: d is not less than 20mm ₃ ≤60mm。

In the technical scheme, the distance between the axial direction of the first cavity surface along the press roll and the second cavity surface is limited to be within 20-60 mm, and the size of the communicating cavity is moderate, so that the pressure medium can quickly enter the surrounding cavity through the communicating cavity, the rolling surface can be quickly deformed outwards in a micro mode, the rolling preparation time is shortened, the press roll can have enough strength, and the risk of damage of the press roll in the rolling process is reduced. When D is ₃ The size of the communicating cavity is smaller than 20mm, the resistance of the pressure medium passing through the communicating cavity is larger, and the passing speed is slower. When D is ₃ The size of the communicating cavity is bigger than 60mm, which easily causes insufficient strength of the press roller, so that the risk of damaging the press roller is increased.

As an alternative technical scheme of the embodiment of the application, D is 30mm less than or equal to D ₃ ≤50mm。

In the technical scheme, the distance between the axial direction of the first cavity surface along the press roll and the second cavity surface is limited to be within 20-60 mm, and the size of the communicating cavity is moderate, so that the pressure medium can quickly enter the surrounding cavity through the communicating cavity, the rolling surface can be quickly deformed outwards in a micro mode, the rolling preparation time is shortened, the press roll can have enough strength, and the risk of damage of the press roll in the rolling process is reduced.

As an optional technical scheme of the embodiment of the application, two accommodating cavities are formed in the press roll, and the two accommodating cavities are arranged along the axial direction of the press roll.

In the technical scheme, two accommodating cavities are formed in the press roller, and pressure medium can be respectively introduced into the two accommodating cavities, so that the accommodating cavities are filled with the pressure medium more quickly, the rolling surface is enabled to deform outwards in a micro-amount, and the rolling preparation time is shortened.

As an optional technical solution of this embodiment of the present application, the press roller includes a partition portion, two accommodation cavities are respectively disposed on two sides of the partition portion along an axial direction of the press roller, and the partition portion is configured to partition the two accommodation cavities.

In the technical scheme, the separation part separates two accommodating cavities, and the two accommodating cavities are mutually independent and are not communicated, so that the pressure of pressure medium in the accommodating cavities is more conveniently controlled, and the rolling surface is more accurate in the amount of outward micro deformation. In addition, the separation part can also play a supporting role, so that the strength of the press roller is better, and the risk of damage to the press roller is reduced.

As an alternative solution of the embodiment of the present application, the separation part is located at a middle position of the rolling surface along the axial direction of the pressing roller.

In the above technical scheme, through setting up the partition portion in the axial intermediate position of roll-in face along the compression roller, the size of two accommodation cavities can be set up comparatively closely, and when filling pressure medium, the required time of two accommodation cavities is comparatively close, is favorable to reducing roll-in preparation time.

As an alternative solution of the embodiment of the present application, two accommodating cavities are symmetrically distributed on two sides of the partition portion.

In the above technical solution, by symmetrically distributing the two accommodating chambers on both sides of the partition, the time required for the two accommodating chambers is almost the same when the pressure medium is filled, which is advantageous for reducing the rolling preparation time.

As an optional technical scheme of this application embodiment, the compression roller is provided with two medium runners, one medium runner's one end corresponds with one hold the chamber intercommunication, the other end of medium runner forms the medium entry, two the medium entry is located respectively the axial both ends of compression roller.

In the technical scheme, the two medium inlets are respectively arranged at the two axial ends of the press roller, the positions of the medium inlets are not easy to interfere with other parts, and pressure medium is conveniently introduced into the corresponding accommodating cavities through the two medium inlets.

As an alternative aspect of the embodiment of the present application, the outer circumferential surface of the roll member forms the roll surface.

In the above technical solution, the outer peripheral surface of the roll member forms a rolling surface, mainly the outer peripheral surface of the roll member contacts with the workpiece to roll the workpiece.

As an optional technical scheme of this application embodiment, the connecting piece is provided with the convex part, follows the axial of compression roller, the one end of roll-in spare is provided with the recess, the convex part hold in the recess, the surface of convex part and the cell wall face of recess jointly define hold the chamber.

In the technical scheme, the convex part stretches into the groove and has a gap with the wall surface of the groove, so that the outer surface of the convex part and the wall surface of the groove jointly define the accommodating cavity, thereby being beneficial to simplifying the manufacture and reducing the manufacturing cost.

As an alternative solution of the embodiment of the present application, the accommodating cavity includes a surrounding cavity and a communicating cavity, the surrounding cavity is communicated with the communicating cavity, and the surrounding cavity is disposed around the axis of the press roll; the groove wall surface comprises a groove bottom surface and a groove side surface which surrounds the groove bottom surface, the outer surface of the convex part comprises an end surface and an outer peripheral surface which surrounds the end surface, the groove bottom surface and the end surface define the communication cavity, and the groove side surface and the outer peripheral surface of the convex part define the surrounding cavity.

In the technical scheme, the surrounding cavity is defined by the groove side surface of the groove and the outer peripheral surface of the convex part, the surrounding cavity is arranged around the axis of the compression roller, and the pressure medium is introduced into the surrounding cavity, so that the whole periphery of the compression roller can be outwards and slightly deformed. Thus, the thickness uniformity of the workpiece along its length is better during continuous rolling. A communication chamber is defined by the groove bottom surface of the groove and the end surface of the convex portion so that the pressure medium enters the surrounding chamber through the communication chamber.

As an optional technical solution of this embodiment of the present application, the connecting piece is provided with a medium runner, one end of the medium runner is communicated with the communication cavity, and the other end of the medium runner extends to the outer surface of the connecting piece, so as to form a medium inlet.

In the technical scheme, the medium flow channel is arranged so that pressure medium is introduced from the medium inlet, the pressure medium passes through the communication cavity from the medium flow channel and reaches the surrounding cavity, and the rolling surface of the compression roller is further deformed outwards in a micro manner, so that the thickness of a rolled workpiece is compensated, and the thickness of the workpiece is more uniform.

As an optional technical solution of this embodiment of the present application, along an axial direction of the pressing roller, an end of the medium flow channel away from the communication cavity extends to an end of the connecting piece away from the bottom surface of the groove.

In the above technical solution, along the axial direction of the press roller, one end of the medium flow passage extends to one end of the connecting piece away from the bottom surface of the groove, so that a medium inlet is formed on one end of the press roller in the axial direction. Thus, the position of the medium inlet is not easy to interfere with other parts, so that pressure medium can be conveniently introduced into the medium flow passage through the medium inlet.

As an optional technical solution of this embodiment, the connecting piece includes supporting part and connecting portion, follows the axial of compression roller, supporting part with the convex part is located respectively the both sides of connecting portion, connecting portion with the roll-in piece is connected.

In the above technical scheme, the supporting part can be connected with the bearing seat of the press roller to support the press roller, and the connecting part is connected with the roll-in piece to enable the connecting piece to be connected with the roll-in piece to form the press roller.

As an optional technical scheme of this application embodiment, the compression roller includes two the connecting piece, follows the axial of compression roller, the relative both ends of compression roller all are provided with the recess, two the convex part of connecting piece holds respectively in two in the recess, one the surface of convex part and the cell wall face of a recess jointly define one hold the chamber.

In the technical scheme, through setting up two connecting pieces, the convex part on two connecting pieces cooperates with two recesses on the roll casting die respectively, jointly defines two accommodation cavities. Pressure medium can be respectively introduced into the two accommodating cavities, so that the accommodating cavities can be filled with the pressure medium more quickly, the rolling surface is enabled to deform outwards slightly, and the rolling preparation time is shortened.

As an optional technical solution of this embodiment of the present application, the rolling member includes a partition portion, and two grooves are respectively located at two sides of the partition portion along an axial direction of the pressing roller.

In a second aspect, an embodiment of the present application further provides a rolling system, where the rolling system includes the press roller and a medium supply device, where the medium supply device is in communication with the accommodating cavity, and the medium supply device is configured to supply the pressure medium into the accommodating cavity.

As an alternative to the embodiments of the present application, the rolling system further comprises a pressure adjusting device configured to adjust the pressure of the pressure medium in the receiving chamber.

In the technical scheme, the pressure of the pressure medium in the accommodating cavity is regulated by the pressure regulating device, so that the outward deformation of the rolling surface is accurately controlled, the thickness of the rolled workpiece is more accurately compensated, and the thickness of the workpiece is more uniform.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a press roll according to some embodiments of the present application;

FIG. 2 is a schematic front view of a press roll provided in some embodiments of the present application;

FIG. 3 is a cross-sectional view taken at the A-A position of FIG. 2;

FIG. 4 is a schematic cross-sectional view of a press roll according to further embodiments of the present application;

FIG. 5 is a schematic cross-sectional view of a press roll provided in accordance with further embodiments of the present application;

FIG. 6 is a schematic cross-sectional view of a press roll provided in accordance with further embodiments of the present application;

FIG. 7 is a cross-sectional view of the B-B position of FIG. 3;

FIG. 8 is a schematic cross-sectional view of a press roll provided in accordance with further embodiments of the present application;

FIG. 9 is an exploded view of a press roll provided in some embodiments of the present application;

fig. 10 is a schematic structural diagram of a rolling system according to some embodiments of the present disclosure.

Icon: 10-rolling system; 100-pressing rolls; 110-a receiving cavity; 111-surrounding the cavity; 1111-an external luminal surface; 1112-lumen surface; 112-communicating the cavity; 1121-a first facet; 1122-a second facet; 120-medium flow channel; 121-media inlet; 130-partitions; 140-rolling piece; 141-grooves; 1411-groove sides; 1412-groove bottom surface; 142-rolling the surface; 150-connecting piece; 151-a protrusion; 1511-an outer peripheral surface; 1512-end face; 152-a support; 153-connection; 200-medium supply means; 300 pressure regulating means.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

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 in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases 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.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

The term "and/or" in this application is merely an association relation describing an associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and in the interest of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the present application, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are illustrative only and should not be construed as limiting the present application in any way.

The term "plurality" as used herein refers to more than two (including two).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited by the embodiment of the present application. The battery cells may be cylindrical, flat, rectangular, or otherwise shaped, as well as the embodiments herein are not limited in this regard. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft pack battery cell are not limited thereto.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cell to some extent.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive plate, a negative plate and a separation membrane. The battery cell mainly relies on metal ions to move between the positive and negative electrode plates to operate. The positive plate comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode lug. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive lugs is multiple and stacked together, and the number of negative lugs is multiple and stacked together. The material of the separator may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may be a wound structure or a lamination structure, and the embodiment of the present application is not limited thereto.

Currently, the more widely the battery is used in view of the development of market situation. The 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 various fields such as aerospace and the like. With the continuous expansion of the battery application field, the market demand thereof is also continuously expanding.

The battery includes an electrode assembly, which is a component in the battery in which an electrochemical reaction occurs. The electrode assembly is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate. The uniformity of the thickness of the pole piece can affect the performance of the pole piece and thus the performance of the battery. However, the thickness uniformity of the current pole piece is poor.

In the manufacturing process of the pole piece, the pole piece is required to be rolled, and the thickness of the pole piece is controlled. When the pole piece is rolled by the compression roller in the related art, the two ends of the compression roller can be subjected to pressure, so that the compression roller is provided with enough pressure to roll the pole piece. However, since the forces at both ends of the pressing roller are different from the forces at the middle of the pressing roller, the middle of the pressing roller slightly arches or dents with respect to the both ends (when both ends of the pressing roller are subjected to downward pressure, the middle of the pressing roller slightly dents when both ends of the pressing roller are subjected to upward pressure), thereby resulting in a thickness of the middle of the pole piece being 1-3 μm greater than that of the both ends, and thus resulting in poor thickness uniformity of the pole piece.

In view of this, the present embodiment provides a press roller having a rolling surface for rolling a workpiece. The press roll is formed with a receiving chamber therein for receiving a pressure medium to deform the roll surface at least partially outwardly.

The pressure roller is internally provided with the accommodating cavity, and the pressure medium is introduced into the accommodating cavity, so that the rolling surface of the pressure roller is outwards slightly deformed, the thickness of a rolled workpiece is compensated, and the thickness of the workpiece is more uniform.

The technical scheme described in the embodiment of the application is suitable for high-precision rolling of workpieces, such as pole pieces.

Referring to fig. 1, fig. 2, and fig. 3, fig. 1 is a schematic structural diagram of a press roll 100 according to some embodiments of the present application. Fig. 2 is a schematic front view of a press roll 100 according to some embodiments of the present application. Fig. 3 is a cross-sectional view of the position A-A in fig. 2. The present embodiment provides a press roll 100, the press roll 100 having a roll surface 142 for rolling a workpiece. The press roll 100 has a receiving chamber 110 formed therein, the receiving chamber 110 being adapted to receive a pressure medium to at least partially deform the roll surface 142 outwardly.

The rolling surface 142 is a surface of the press roller 100 for contacting the workpiece to roll the workpiece. In general, the rolling surface 142 is the outer peripheral surface of the portion of the press roll 100 having the largest diameter.

The accommodating chamber 110 is a chamber formed inside the press roller 100, and the pressure medium is introduced into the accommodating chamber 110 to apply pressure to the chamber wall of the accommodating chamber 110, thereby slightly deforming the rolling surface 142 of the press roller 100 outward. In the present embodiment, the micro deformation means deformation having an amplitude (deformation amount) of deformation of 1 μm or more.

The pressure medium may be a liquid medium, for example, water or oil. The pressure medium may also be a gaseous medium, for example air.

The accommodating cavity 110 is formed in the press roll 100, and the pressure medium is introduced into the accommodating cavity 110 to enable the roll surface 142 of the press roll 100 to deform slightly outwards, so that the thickness of a rolled workpiece is compensated, and the thickness of the workpiece is more uniform.

Referring to fig. 3, in some embodiments, the receiving chamber 110 includes a surrounding chamber 111, the surrounding chamber 111 being disposed about the axis of the platen roller 100.

The surrounding chamber 111 is a chamber provided around the axis of the platen roller 100. For example, the surrounding cavity 111 may be an annular cavity having a circular cross section, and the axis of the press roll 100 is located within the range defined by the annular inner ring. Optionally, the axis of the pressure roller 100 passes through the center of the circle.

Through setting up the chamber 111 of encircleing that encircles the axis setting of compression roller 100, to encircling the intracavity and leading in pressure medium, can make the whole week of compression roller 100 all outwards trace deformation, like this, at the in-process of continuous roll-in, the work piece can be better along its length direction's thickness homogeneity.

In other embodiments, the receiving chamber 110 may include a plurality of first chambers disposed around the axis of the platen roller 100, or alternatively, the plurality of first chambers may be spaced apart along the circumference of the platen roller 100. By providing a plurality of first chambers provided around the axis of the press roll 100, the pressure medium is introduced into the first chambers, and the roll surface 142 of the press roll 100 can be deformed slightly outwardly. The smaller the interval between the adjacent two first chambers in the circumferential direction of the press roll 100, the better the thickness uniformity of the workpiece along the length direction thereof during the continuous rolling.

Referring to fig. 3, in some embodiments, the extension of the circumferential chamber 111 is parallel to the axial direction of the press roll 100.

The axial direction of the press roller 100 refers to the direction of the rotation center axis of the press roller 100, that is, the extending direction of the axis of the press roller 100. The axial direction of the press roll 100 is perpendicular to the radial direction of the press roll 100, and the radial direction of the press roll 100 refers to the radial or diametrical direction of the circular end surface of the press roll 100. Referring to fig. 3, the axial direction of the pressing roller 100 may be the X direction shown in fig. 3. The radial direction of the press roll 100 may be the Y direction shown in fig. 3.

The encircling chamber 111 includes an inner chamber surface 1112 and an outer chamber surface 1111 disposed about the axis of the platen roller 100, the outer chamber surface 1111 being located outboard of the inner chamber surface 1112. The extending direction of the surrounding cavity 111 means: along the radial direction of the press roller 100, the projection of the axis of the press roller 100 onto the outer cavity surface 1111 is directed.

Referring to fig. 3, in the embodiment shown in fig. 3, the projection of the axis of the platen roller 100 onto the outer cavity surface 1111 is parallel to the axis of the platen roller 100 in the radial direction of the platen roller 100. Thus, the extending direction of the encircling chamber 111 is parallel to the axial direction of the press roll 100.

By making the extending direction of the encircling cavity 111 parallel to the axial direction of the press roll 100, on the one hand, the degree of outward micro deformation of the rolling surface 142 at different positions can be made relatively uniform. On the other hand, the processing and manufacturing are convenient, and the production cost is reduced.

Referring to fig. 4, fig. 4 is a schematic cross-sectional view of a press roll 100 according to other embodiments of the present disclosure. In other embodiments, the extension of the projection of the axis of the platen roller 100 onto the outer chamber surface 1111 intersects the axis of the platen roller 100 in the radial direction of the platen roller 100, and the extension direction of the circumferential chamber 111 intersects the axial direction of the platen roller 100.

Referring to fig. 3, in some embodiments, the spacing L between the circumferential cavity 111 and the rolling surface 142 along the radial direction of the pressing roller 100 satisfies: l is less than or equal to 60mm.

Referring to fig. 3, the circumferential cavity 111 is spaced from the roll surface 142 at the same distance in the radial direction of the roll 100 at different positions in the axial direction or the circumferential direction of the roll 100. At this time, the distance between any position of the encircling chamber 111 and the roll surface 142 in the radial direction of the press roll 100 may be taken as the distance between the encircling chamber 111 and the roll surface 142. The circumferential chamber 111 is required to have a distance of 60mm or less from the roll surface 142 in the radial direction of the roll 100.

In other embodiments, the circumferential cavity 111 is spaced apart from the roll surface 142 at different locations along the axial direction of the roll 100 in the radial direction of the roll 100. At this time, the maximum distance between the surrounding cavity 111 and the roll surface 142 in the radial direction of the roll 100 is less than or equal to 60mm.

In still other embodiments, the circumferential cavity 111 is spaced apart from the roll surface 142 at different locations along the circumference of the roll 100 in the radial direction of the roll 100. At this time, the maximum distance between the surrounding cavity 111 and the roll surface 142 in the radial direction of the roll 100 is less than or equal to 60mm.

The spacing between the surrounding cavity 111 and the roll surface 142 in the radial direction of the roll 100 may be: l=60 mm, 55mm, 50mm, 45mm, 40mm, 35mm, 30mm, 25mm, etc.

By making the distance between the surrounding cavity 111 and the roll-pressing surface 142 smaller than or equal to 60mm, the roll-pressing surface 142 is made to deform slightly outwards by the pressure medium. When L > 60mm, the spacing between the surrounding cavity 111 and the rolling surface 142 is too large, the rolling surface 142 is difficult to deform or deform too little (less than 0.5 μm) under the action of the pressure medium, and the thickness of the rolled workpiece is difficult to compensate.

Referring to FIG. 3, in some embodiments, L is 40mm.

Referring to fig. 3, the circumferential cavity 111 is spaced from the roll surface 142 at the same distance in the radial direction of the roll 100 at different positions in the axial direction or the circumferential direction of the roll 100. At this time, the distance between any position of the encircling chamber 111 and the roll surface 142 in the radial direction of the press roll 100 may be taken as the distance between the encircling chamber 111 and the roll surface 142. It is desirable that the circumferential chamber 111 be spaced from the roll surface 142 by a distance of 40mm or more in the radial direction of the roll 100.

In other embodiments, the circumferential cavity 111 is spaced apart from the roll surface 142 at different locations along the axial direction of the roll 100 in the radial direction of the roll 100. At this time, the minimum distance from the roll surface 142 to the surrounding cavity 111 in the radial direction of the roll 100 is 40mm or more.

In still other embodiments, the circumferential cavity 111 is spaced apart from the roll surface 142 at different locations along the circumference of the roll 100 in the radial direction of the roll 100. At this time, the minimum distance from the roll surface 142 to the surrounding cavity 111 in the radial direction of the roll 100 is 40mm or more.

The spacing between the surrounding cavity 111 and the roll surface 142 in the radial direction of the roll 100 may be: l=60 mm, 58mm, 55mm, 52mm, 50mm, 48mm, 45mm, 42mm, 40mm, etc.

By spacing the surrounding cavity 111 from the roll surface 142 by greater than or equal to 40mm so that the roll 100 has sufficient strength, the risk of damage to the roll 100 during the roll process is reduced. When L < 40mm, too small a distance between the surrounding cavity 111 and the face of the press roll 100 easily causes insufficient strength of the press roll 100, so that the risk of damage to the press roll 100 during the rolling process increases.

In some embodiments, 45 mm.ltoreq.L.ltoreq.55 mm.

The spacing between the surrounding cavity 111 and the roll surface 142 in the radial direction of the roll 100 may be: l=55 mm, 54mm, 53mm, 52mm, 51mm, 50mm, 49mm, 48mm, 47mm, 46mm, 45mm, etc.

By making the distance between the surrounding cavity 111 and the rolling surface 142 within 45-55 mm, the rolling surface 142 is convenient to deform slightly outwards under the action of pressure medium, the compression roller 100 has enough strength, and the risk of damage of the compression roller 100 in the rolling process is small.

Referring to fig. 3, in some embodiments, the encircling chamber 111 includes an inner chamber surface 1112 disposed about the axis of the platen roller 100 and an outer chamber surface 1111, the outer chamber surface 1111 being located outboard of the inner chamber surface 1112. Along the radial direction of the press roll 100, the distance D between the inner cavity surface 1112 and the outer cavity surface 1111 is ₁ The method comprises the following steps: d is not less than 20mm ₁ ≤60mm。

Along the radial direction of the press roll 100, the encircling cavity 111 comprises an inner cavity surface 1112 and an outer cavity surface 1111 which are oppositely arranged, the inner cavity surface 1112 and the outer cavity surface 1111 are both arranged around the axis of the press roll 100, and the inner cavity surface 1112 is located inside the outer cavity surface 1111. The distance between the inner chamber surface 1112 and the outer chamber surface 1111 in the radial direction of the press roll 100 characterizes the size of the surrounding chamber 111. The greater the distance of the inner surface 1112 from the outer surface 1111 in the radial direction, the greater the circumferential cavity 111. The smaller the distance of the inner surface 1112 from the outer surface 1111 in the radial direction, the smaller the circumferential cavity 111.

Referring to fig. 3, in some embodiments, the inner chamber surface 1112 is spaced from the outer chamber surface 1111 at the same distance along the radial direction of the platen roller 100 at different locations along the axial or circumferential direction of the platen roller 100. At this time, the distance between any position of the inner surface 1112 and the outer surface 1111 in the radial direction of the press roll 100 may be set as the distance between the inner surface 1112 and the outer surface 1111. The inner cavity surface 1112 is required to be less than or equal to 60mm and greater than or equal to 20mm from the outer cavity surface 1111 in the radial direction of the press roller 100.

In other embodiments, the spacing of the inner chamber surface 1112 from the outer chamber surface 1111 may be different at different locations along the axial or circumferential direction of the platen roller 100 in the radial direction of the platen roller 100. At this time, in the radial direction of the press roller 100, the maximum distance of the inner chamber surface 1112 from the outer chamber surface 1111 is less than or equal to 60mm, and the minimum distance of the inner chamber surface 1112 from the outer chamber surface 1111 is greater than or equal to 20mm.

The distance between the inner chamber surface 1112 and the outer chamber surface 1111 in the radial direction of the press roll 100 may be: d (D) ₁ =60 mm, 55mm, 50mm, 45mm, 40mm, 35mm, 30mm, 25mm, 20mm, etc.

By limiting the distance between the inner cavity surface 1112 and the outer cavity surface 1111 in the radial direction of the press roll 100 to 20-60 mm, the size of the surrounding cavity 111 is moderate, which is beneficial for the pressure medium to rapidly fill the surrounding cavity 111, so as to facilitate rapid useThe rolling surface 142 deforms slightly outwards, so that the rolling preparation time is reduced, the compression roller 100 can have enough strength, and the risk of damage to the compression roller 100 in the rolling process is reduced. When D is ₁ The size of the surrounding cavity 111 is too small, the resistance of the pressure medium entering the surrounding cavity 111 is large, and the entering speed is slow. When D is ₁ The size of the circumferential cavity 111 is too large, which easily results in insufficient strength of the press roll 100, so that the risk of damage to the press roll 100 during the rolling process increases.

In some embodiments, 30 mm.ltoreq.D ₁ ≤50mm。

The distance between the inner chamber surface 1112 and the outer chamber surface 1111 in the radial direction of the press roll 100 may be: d (D) ₁ =50 mm, 48mm, 45mm, 42mm, 40mm, 38mm, 35mm, 32mm, 30mm, etc.

Through limiting the distance between the inner cavity surface 1112 and the outer cavity surface 1111 along the radial direction of the press roll 100 within 30-50 mm, the size of the surrounding cavity 111 is moderate, so that the surrounding cavity 111 is conveniently and rapidly filled with pressure medium, the roll surface 142 is conveniently and rapidly deformed outwards in a micro manner, the roll preparation time is shortened, the press roll 100 can have enough strength, and the risk of damage of the press roll 100 in the roll process is reduced.

Referring to fig. 3 and 5, fig. 5 is a schematic cross-sectional view of a press roll 100 according to still other embodiments of the present application. In some embodiments, the platen roller 100 is provided with a media flow path 120, the media flow path 120 being in communication with the surrounding cavity 111. One end of the medium flow path 120 extends to the outer surface of the pressing roller 100 to form a medium inlet 121.

One end of the medium flow path 120 communicates with the surrounding chamber 111, and the other end of the medium flow path 120 extends to the outer surface of the press roller 100, forming a medium inlet 121. The medium flow passage 120 may be directly connected to the surrounding chamber 111, or may be connected to the surrounding chamber 111 through some intermediate chamber. Referring to fig. 3, in the embodiment shown in fig. 3, the medium flow channel 120 communicates with the surrounding cavity 111 through some intermediate chamber. Referring to fig. 5, in the embodiment shown in fig. 5, the medium flow channel 120 is directly connected to the surrounding cavity 111.

The shape of the cross section of the medium flow channel 120 along the direction perpendicular to its extending direction includes, but is not limited to, a circle, a square, a triangle, etc.

By providing the medium flow channel 120 so as to facilitate the introduction of the pressure medium from the medium inlet 121, the pressure medium enters the surrounding cavity 111, and the rolling surface 142 of the pressing roller 100 is slightly deformed outwards, so that the thickness of the rolled workpiece is compensated, and the thickness of the workpiece is more uniform.

Referring to fig. 3, in some embodiments, the media flow path 120 extends in the axial direction of the platen roller 100. The accommodating chamber 110 further includes a communication chamber 112, one end of the medium flow path 120 extends to one end of the platen roller 100 in the axial direction, and the other end of the medium flow path 120 communicates with the communication chamber 112. The communication chamber 112 communicates with the surrounding chamber 111.

"the medium flow path 120 extends in the axial direction of the platen roller 100" is also understood to mean that the direction of extension of the medium flow path 120 is parallel to the axial direction of the platen roller 100.

The communication chamber 112 is a chamber structure that communicates the medium flow passage 120 with the surrounding chamber 111. The shape of the communication chamber 112 is not limited as long as the medium flow passage 120 and the surrounding chamber 111 can be communicated. For example, the communication chamber 112 may be a chamber structure extending in the radial direction of the platen roller 100.

Referring to fig. 3 and 9, the pressing roller 100 includes a pressing member 140 and a supporting portion 152, and the pressing member 140 is connected to the supporting portion 152. The rolling member 140 is used for rolling a workpiece, and a rolling surface 142 is formed on the rolling member 140. The supporting portion 152 is for connection with a bearing housing to support the platen roller 100. The outer diameter of the supporting portion 152 is smaller than the outer diameter of the rolling member 140. In the embodiment shown in fig. 3, one end of the media flow path 120 extends to an end face 1512 of the support 152.

One end of the medium flow path 120 extends to one end of the platen roller 100 in the axial direction to form a medium inlet 121 on one end of the platen roller 100 in the axial direction. In this way, the medium inlet 121 is not easily interfered with other components, so that pressure medium can be conveniently introduced into the medium flow channel 120 through the medium inlet 121. At this time, the medium flow channel 120 is disposed to extend along the axis of the pressing roller 100, so that the length of the medium flow channel 120 is shorter, so as to facilitate rapid feeding of the pressure medium, and reduce the preparation time for rolling. Through setting up intercommunication chamber 112 intercommunication medium runner 120 and encircle chamber 111 to in being convenient for make the pressure medium that lets in medium runner 120 enter into encircle the intracavity 111, and then make the roll-in face 142 of compression roller 100 outwards micro deformation, thereby compensate the thickness of work piece of roll-in, make the thickness of work piece more even.

Referring to fig. 5 and 9, one end of the medium flow path 120 extends to an end face 1512 of the roller 140, and a medium inlet 121 is formed in the end face 1512 of the roller 140, so that pressure medium can be supplied into the medium flow path 120.

Referring to fig. 6 and 9, fig. 6 is a schematic cross-sectional view of a press roll 100 according to still other embodiments of the present application. In still other embodiments, one end of the medium flow path 120 extends to the circumferential surface of the support portion 152, and the medium inlet 121 is formed on the circumferential surface of the support portion 152, which can also achieve the supply of the pressure medium into the medium flow path 120.

Referring to FIG. 3, in some embodiments, the medium flow channel 120 has a diameter D ₂ The method comprises the following steps: d is not less than 20mm ₂ ≤60mm。

In the embodiment shown in fig. 3, the medium flow path 120 has a circular shape in a cross section perpendicular to the extending direction thereof. Along the extending direction of the medium flow path 120, the diameter of the medium flow path 120 is unchanged. At this time, the diameter of one position of the medium flow path 120 may be taken as the diameter of the medium flow path 120 such that the diameter of the medium flow path 120 is 20mm or more and 60mm or less.

In other embodiments, the media flow path 120 is circular in shape in cross-section perpendicular to its direction of extension. Along the extending direction of the medium flow path 120, the diameter of the medium flow path 120 is changed, for example, gradually increased. At this time, the minimum diameter of the medium flow path 120 is 20mm or more, and the maximum diameter is 60mm or less.

The diameter of the media flow path 120 may be: d (D) ₂ =60 mm, 55mm, 50mm, 45mm, 40mm, 35mm, 30mm, 25mm, 20mm, etc.

By limiting the diameter of the medium flow channel 120 within 20-60 mm, the medium flow channel 120 has moderate size, which is beneficial to the pressure medium to quickly enter the surrounding cavity 111 through the medium flow channel 120, so as to quickly lead the rolling surface 142 to be slightly deformed outwards, reduce the rolling preparation time and lead the press roll 100 to have the following characteristics Sufficient strength to reduce the risk of damage to the press roll 100 during the rolling process. When D is ₂ The size of the medium flow channel 120 is smaller than 20mm, the resistance of the pressure medium entering the medium flow channel 120 is larger, and the entering speed is slower. When D is ₂ The medium flow passage 120 is oversized by > 60mm, which easily results in insufficient strength of the press roll 100, so that the risk of damage to the press roll 100 increases.

In some embodiments, 30 mm.ltoreq.D ₂ ≤50mm。

The diameter of the media flow path 120 may be: d (D) ₂ =50 mm, 48mm, 45mm, 42mm, 40mm, 38mm, 35mm, 32mm, 30mm, etc.

Through limiting the diameter of the medium flow channel 120 within 30-50 mm, the size of the medium flow channel 120 is more suitable, so that pressure medium can quickly enter the surrounding cavity 111 through the medium flow channel 120, the rolling surface 142 can be quickly and slightly deformed outwards, the rolling preparation time is shortened, the strength of the press roll 100 is higher, and the damage risk of the press roll 100 in the rolling process is reduced.

Referring to fig. 3, in some embodiments, the center line of the media flow path 120 coincides with the axis of the platen roller 100.

"the center line of the medium flow path 120 coincides with the axis of the press roll 100" may also be understood as that the center line of the medium flow path 120 is in the same line as the axis of the press roll 100, or that the medium flow path 120 takes the axis of the press roll 100 as the center line.

When the center line of the medium flow channel 120 is coincident with the axis of the press roller 100, the medium flow channel 120 is located at the center of the press roller 100, and the mass distribution on the press roller 100 is relatively uniform, so that the press roller 100 is not easy to shake in the rotation process. In addition, the medium flow channel 120 is located at the center of the press roll 100, so that the pressure medium can flow from the middle position to two sides to the surrounding cavity 111 after passing through the medium flow channel 120, which is beneficial to the rapid filling of the surrounding cavity 111 by the pressure medium, so as to rapidly and slightly deform the roll surface 142 outwards, and reduce the roll preparation time.

Referring to fig. 5, in other embodiments, the center line of the media flow path 120 is parallel to the axis of the platen roller 100.

Referring to fig. 3 and 7, fig. 7 is a cross-sectional view of the B-B position in fig. 3. The communication chamber 112 has a circular cross section perpendicular to the axis of the press roll 100.

The communication chamber 112 is a cylindrical cavity, and the axis of the cylindrical cavity coincides with the axis of the press roller 100.

By making the cross section of the communication chamber 112 perpendicular to the axis of the press roll 100 circular, the pressure medium can flow 360 ° to the surrounding chamber 111 after passing through the medium flow channel 120, which is beneficial for the pressure medium to rapidly fill the surrounding chamber 111, so as to rapidly and slightly deform the roll surface 142 outwards, and reduce the roll preparation time.

Referring to FIG. 3, in some embodiments, in the axial direction of the platen roller 100, the communication chamber 112 includes a first chamber surface 1121 and a second chamber surface 1122 that are disposed opposite to each other, and the distance between the first chamber surface 1121 and the second chamber surface 1122 is D ₃ The method comprises the following steps: d is not less than 20mm ₃ ≤60mm。

In some embodiments, the first and second chamber faces 1121, 1122 are two axially opposite faces of the communication chamber 112. The first and second chamber surfaces 1121, 1122 may be disposed in parallel, and in this case, any point on the first chamber surface 1121 is the same distance from the second chamber surface 1122 in the axial direction of the press roll 100. The distance between a point on the first cavity surface 1121 and the second cavity surface 1122 may be taken as the distance between the first cavity surface 1121 and the second cavity surface 1122 such that the distance between the first cavity surface 1121 and the second cavity surface 1122 in the axial direction of the press roll 100 is 20mm or more and 60mm or less.

In other embodiments, the distance from the second web 1122 to different locations on the first web 1121 along the axial direction of the platen roller 100 may be different. At this time, the maximum distance between the first cavity surface 1121 and the second cavity surface 1122 in the axial direction of the press roll 100 is 60mm or less, and the minimum distance between the first cavity surface 1121 and the second cavity surface 1122 is 20mm or more.

The distance between the first and second chamber surfaces 1121, 1122 in the axial direction of the pressure roller 100 may be: d (D) ₃ =60 mm, 55mm, 50mm, 45mm, 40mm, 35mm, 30mm, 25mm, 20mm, etc.

By limiting the distance between the first cavity surface 1121 and the second cavity surface 1122 in the axial direction of the roll 100 to 20 to 60mm, the roll is continuously connectedThe through cavity 112 has moderate size, which is beneficial for pressure medium to enter the surrounding cavity 111 through the through cavity 112, so as to lead the rolling surface 142 to deform outwards slightly, reduce the rolling preparation time, lead the press roll 100 to have enough strength and reduce the risk of damage of the press roll 100 in the rolling process. When D is ₃ The size of the communication cavity 112 is smaller than 20mm, the resistance of the pressure medium passing through the communication cavity 112 is larger, and the passing speed is slower. When D is ₃ The size of the communication cavity 112 is too large, which easily results in insufficient strength of the press roll 100, so that the risk of damage to the press roll 100 increases.

In some embodiments, 30 mm.ltoreq.D ₃ ≤50mm。

The distance between the first and second chamber surfaces 1121, 1122 in the axial direction of the pressure roller 100 may be: d (D) ₃ =50 mm, 48mm, 45mm, 42mm, 40mm, 38mm, 35mm, 32mm, 30mm, etc.

Through limiting the distance between the first cavity surface 1121 and the second cavity surface 1122 along the axial direction of the press roll 100 within 20-60 mm, the size of the communicating cavity 112 is moderate, which is beneficial for the pressure medium to quickly enter the surrounding cavity 111 through the communicating cavity 112, so that the roll surface 142 can be quickly and slightly deformed outwards, the rolling preparation time is reduced, the press roll 100 can have enough strength, and the risk of damage of the press roll 100 in the rolling process is reduced.

Referring to fig. 3, in some embodiments, two receiving chambers 110 are formed in the press roll 100, and the two receiving chambers 110 are arranged along the axial direction of the press roll 100.

The press roll 100 has two receiving chambers 110 formed therein, and in some embodiments, the two receiving chambers 110 may be independent of each other and not communicate with each other. The two receiving chambers 110 may be spaced apart along the axial direction of the pressing roller 100. In other embodiments, the two receiving chambers 110 may also communicate with each other.

By forming two accommodating chambers 110 in the press roller 100, pressure medium can be respectively introduced into the two accommodating chambers 110, so that the accommodating chambers 110 can be filled with the pressure medium more quickly, the rolling surface 142 deforms slightly outwards, and the rolling preparation time is reduced.

Referring to fig. 3, in some embodiments, the pressing roller 100 includes a partition 130, and two accommodating chambers 110 are respectively disposed at two sides of the partition 130 along an axial direction of the pressing roller 100. The partition 130 is configured to partition the two accommodating chambers 110.

The two accommodating chambers 110 are partitioned by the partition 130, and the two accommodating chambers 110 are independent from each other and do not communicate with each other.

The partition 130 separates the two accommodating chambers 110, and the two accommodating chambers 110 are independent of each other and are not communicated with each other, so that the pressure of the pressure medium in the accommodating chambers 110 can be more conveniently controlled, and the amount of the outward micro deformation of the rolling surface 142 can be more accurate. In addition, the partition 130 can also provide a supporting function, so that the strength of the press roll 100 is better, and the risk of damage to the press roll 100 is reduced.

Referring to fig. 3, in some embodiments, the separator 130 is located at a middle position of the rolling surface 142 along the axial direction of the roll 100.

The partition 130 is located at an intermediate position of the press roller 100 or the press surface 142 or within 50mm from the intermediate position in the axial direction of the press roller 100.

By disposing the partition 130 at an intermediate position of the rolling surface 142 in the axial direction of the press roller 100, the sizes of the two accommodating chambers 110 can be set closer together, and the time required for the two accommodating chambers 110 when filling the pressure medium is closer together, which is advantageous in reducing the rolling preparation time.

Referring to fig. 3, in some embodiments, two accommodating chambers 110 are symmetrically disposed at two sides of the partition 130.

By having two receiving chambers 110 symmetrically distributed on both sides of the partition 130, the time required for the two receiving chambers 110 when filling with pressure medium is nearly the same, which is advantageous in reducing the roll preparation time.

Referring to fig. 3, in some embodiments, the pressing roller 100 is provided with two medium channels 120, one end of one medium channel 120 is correspondingly communicated with one accommodating cavity 110, and the other end of the medium channel 120 forms a medium inlet 121. Two medium inlets 121 are located at both ends of the platen roller 100 in the axial direction, respectively.

The two medium flow passages 120 are respectively communicated with the two accommodating chambers 110, and are respectively used for supplying pressure medium to the two accommodating chambers 110. The two medium flow passages 120 form two medium inlets 121 on the platen roller 100, and the two medium inlets 121 are respectively located at both ends of the platen roller 100 in the axial direction thereof.

The two medium inlets 121 are respectively arranged at two axial ends of the press roll 100, and the positions of the medium inlets 121 are not easy to interfere with other components, so that pressure medium can be conveniently introduced into the corresponding accommodating cavities 110 through the two medium inlets 121.

Referring to fig. 8, fig. 8 is a schematic cross-sectional view of a press roll 100 according to still other embodiments of the present application. In still other embodiments, a receiving chamber 110 and a medium flow path 120 are provided in the press roll 100, and one end of the medium flow path 120 communicates with the receiving chamber 110 in the axial direction of the press roll 100, and the other end of the medium flow path 120 forms a medium inlet 121 at one end of the press roll 100.

Referring to fig. 3 and 9, fig. 9 is an exploded view of a press roll 100 according to some embodiments of the present application. In some embodiments, the press roll 100 includes a press roll 140 and a connection member 150, and the press roll 140 and the connection member 150 are separately provided and connected. The crimp 140 and the connector 150 together define the receiving chamber 110.

By "the roll pressing member 140 and the connection member 150 are separately provided and connected" is meant that the roll pressing member 140 and the connection member 150 are separately provided and finally connected together at the time of manufacture. For example, the connection member 150 may be welded to the rolling member 140. After the roll pressing member 140 is coupled with the coupling member 150, a receiving chamber 110 is defined in the roll pressing member 100. The rolling surface 142 may be formed on the rolling member 140 or on the connecting member 150.

By separately manufacturing the pressing member 140 and the connecting member 150, and then connecting the pressing member 140 and the connecting member 150 together to form the pressing roller 100, the accommodating cavity 110 is defined in the pressing roller 100, which is beneficial to reducing manufacturing cost and improving yield of the pressing roller 100.

In some embodiments, the outer peripheral surface 1511 of the crimp 140 forms the roll nip 142.

The outer peripheral surface 1511 of the rolling member 140 forms a rolling surface 142, mainly the outer peripheral surface 1511 of the rolling member 140 contacts the workpiece to roll the workpiece.

Referring to fig. 3 and 9, in some embodiments, the connector 150 is provided with a protrusion 151. Along the axial direction of the press roller 100, one end of the press member 140 is provided with a groove 141, and the convex portion 151 is accommodated in the groove 141. The outer surface of the protrusion 151 and the wall surface of the groove 141 define the accommodating chamber 110 together.

The connection member 150 is provided with a protrusion 151, and the roll member 140 has a groove 141, and the protrusion 151 has a size smaller than that of the groove 141 so that the protrusion 151 can extend into the groove 141. The outer surface of the protrusion 151 and the wall surface of the groove 141 are spaced from each other, and the space may serve as the accommodating chamber 110.

The protrusion 151 extends into the groove 141 and has a gap with the groove wall surface of the groove 141, so that the outer surface of the protrusion 151 and the groove wall surface of the groove 141 together define the accommodating cavity 110, which is beneficial to simplifying the manufacture and reducing the manufacturing cost.

Referring to fig. 3 and 9, in some embodiments, the accommodating chamber 110 includes a surrounding chamber 111 and a communicating chamber 112, the surrounding chamber 111 communicates with the communicating chamber 112, and the surrounding chamber 111 is disposed around the axis of the platen roller 100. The groove wall surface includes a groove bottom surface 1412 and a groove side surface 1411 disposed around the groove bottom surface 1412. The outer surface of the convex portion 151 includes an end surface 1512 and an outer peripheral surface 1511 disposed around the end surface 1512. The groove bottom face 1412 and the end face 1512 define the communication cavity 112, and the groove side 1411 and the outer peripheral surface 1511 of the boss 151 define the surrounding cavity 111.

The groove side 1411 is a wall surface provided around the axis of the platen roller 100 in the groove wall surface. In the axial direction of the press roll 100, the groove bottom surface 1412 is connected to one end of the groove side surface 1411.

The outer peripheral surface 1511 is a surface disposed around the axis of the platen roller 100 in the outer surface of the convex portion 151. The end surface 1512 is connected to one end of the outer peripheral surface 1511 of the convex portion 151 in the axial direction of the platen roller 100.

In the axial direction of the press roller 100, there is a gap between the groove bottom face 1412 and the end face 1512 of the convex portion 151 to define the communication cavity 112 between the groove bottom face 1412 and the end face 1512 of the convex portion 151. In the radial direction of the press roller 100, a gap is provided between the groove side 1411 and the outer peripheral surface 1511 of the convex portion 151 to define the encircling cavity 111 between the groove side 1411 and the outer peripheral surface 1511 of the convex portion 151.

The circumferential chamber 111 is defined by the groove side surface 1411 of the groove 141 and the outer peripheral surface 1511 of the projection 151, and the circumferential chamber 111 is provided around the axis of the press roll 100, and the pressure medium is introduced into the circumferential chamber 111, so that the entire circumference of the press roll 100 can be slightly deformed outward. Thus, the thickness uniformity of the workpiece along its length is better during continuous rolling. The communication chamber 112 is defined by the groove bottom face 1412 of the groove 141 and the end face 1512 of the convex portion 151 so as to facilitate the pressure medium to enter into the surrounding chamber 111 through the communication chamber 112.

Referring to fig. 9, in some embodiments, the connecting member 150 is provided with a medium flow channel 120, and one end of the medium flow channel 120 is in communication with the communication cavity 112. The other end of the medium flow path 120 extends to the outer surface of the connection member 150 to form the medium inlet 121.

One end of the medium flow channel 120 may extend to an outer surface of the protrusion 151, for example, one end of the medium flow channel 120 extends to an end face 1512 of the protrusion 151, so that the medium flow channel 120 communicates with the communication cavity 112. The other end of the medium flow path 120 may extend to the outer surface of the connection member 150, thereby forming a medium inlet 121, and pressure medium is supplied into the accommodating chamber 110 through the medium inlet 121.

By arranging the medium flow channel 120 so as to facilitate the pressure medium to be introduced from the medium inlet 121, the pressure medium passes through the communication cavity 112 from the medium flow channel 120 to reach the surrounding cavity 111, and the rolling surface 142 of the press roll 100 is further slightly deformed outwards, so that the thickness of the rolled workpiece is compensated, and the thickness of the workpiece is more uniform.

Referring to FIG. 9, in some embodiments, the end of the media flow path 120 remote from the communication cavity 112 extends in the axial direction of the platen roller 100 to the end of the connector 150 remote from the groove bottom surface 1412.

The media flow path 120 extends from an end face 1512 of the connector 150 to an end face 1512 of the boss 151 in the axial direction of the platen roller 100. In other words, along the axial direction of the press roller 100, the end of the medium flow path 120 near the communication chamber 112 is an end face 1512 extending to the convex portion 151, and the end of the medium flow path 120 far from the communication chamber 112 is an end of the connecting member 150 far from the groove bottom face 1412.

In the axial direction of the platen roller 100, one end of the medium flow path 120 extends to one end of the connection member 150 away from the groove bottom surface 1412 to form the medium inlet 121 on one end in the axial direction of the platen roller 100. In this way, the medium inlet 121 is not easily interfered with other components, so that pressure medium can be conveniently introduced into the medium flow channel 120 through the medium inlet 121.

Referring to fig. 9, in some embodiments, the connection member 150 includes a supporting portion 152 and a connection portion 153, and the supporting portion 152 and the protrusion 151 are respectively located at two sides of the connection portion 153 along the axial direction of the pressing roller 100. The connection portion 153 is connected to the nip member 140.

The supporting portion 152 is a portion of the coupling 150 or the platen roller 100 for coupling with the bearing housing, and is coupled with the bearing housing through the supporting portion 152 to support the platen roller 100.

The connection portion 153 is a portion of the connection member 150 connected to the rolling member 140. The supporting portion 152 and the protruding portion 151 are located on both sides of the connecting portion 153, respectively, in the axial direction of the press roller 100, and the protruding portion 151 protrudes from the surface of the connecting portion 153 facing away from the supporting portion 152.

The connection portion 153 may be connected to the roll 140 by connecting the outer peripheral surface of the connection portion 153 to the groove side surface 1411, or by connecting the end surface of the connection portion 153 to the end surface of the roll 140.

The supporting portion 152 may be connected to a bearing housing of the pressing roller 100 to support the pressing roller 100, and the connecting portion 153 is connected to the pressing roller 140 such that the connecting member 150 is connected to the pressing roller 140 to form the pressing roller 100.

Referring to fig. 9, in some embodiments, the pressure roller 100 includes two connectors 150. Opposite ends of the rolling member 140 are provided with grooves 141 in the axial direction of the roll 100. The protrusions 151 of the two connectors 150 are respectively received in the two grooves 141, and the outer surface of one protrusion 151 and the groove wall surface of one groove 141 define a receiving chamber 110.

By providing two connecting members 150, the protrusions 151 of the two connecting members 150 are respectively engaged with the two grooves 141 of the rolling member 140 to define two accommodating chambers 110. Pressure medium can be respectively introduced into the two accommodating cavities 110, so that the accommodating cavities 110 can be filled with the pressure medium more quickly, the rolling surface 142 deforms outwards slightly, and the rolling preparation time is shortened.

Referring to fig. 9, in some embodiments, the pressing member 140 includes a partition 130, and two grooves 141 are respectively located at two sides of the partition 130 along the axial direction of the pressing roller 100.

The partition 130 has two surfaces disposed opposite to each other in the axial direction of the platen roller 100. These two surfaces may be referred to as the bottom 1412 of the grooves 141, respectively.

When the press roll 100 is manufactured, the press roll 140 can be machined through bore milling, the connecting piece 150 is assembled with the press roll 140 through a mechanical insert assembly process, and final machining is finished through a large-ramp chamfer welding process after the assembly is finished.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a rolling system 10 according to some embodiments of the present disclosure. The embodiment of the present application also provides a rolling system 10, where the rolling system 10 includes the press roller 100 and the medium feeding device 200, and the medium feeding device 200 is in communication with the accommodating chamber 110. The medium supply device 200 is used for supplying a pressure medium into the accommodating chamber 110.

The medium supply device 200 is a device for supplying a pressure medium to the accommodating chamber 110 of the press roller 100. For example, the medium supply device 200 may include a driving member for storing a pressure medium and a medium reservoir for driving the medium stored in the medium reservoir into the accommodating chamber 110. The driving member may be a water pump, an oil pump, an air pump, etc.

Referring to fig. 10, in some embodiments, the rolling system 10 further includes a pressure adjustment device configured to adjust the pressure of the pressure medium within the receiving cavity 110.

The pressure regulating means is a means for regulating the pressure of the pressure medium in the receiving chamber 110. For example, the pressure regulating device may be a servo valve.

The pressure of the pressure medium in the accommodating cavity 110 is regulated by setting the pressure regulating device so as to accurately control the outward deformation of the rolling surface 142, and more accurately compensate the thickness of the rolled workpiece, so that the thickness of the workpiece is more uniform.

Please refer to fig. 3 and 10, according to some embodiments of the present application.

The present embodiment provides a press roll 100, the press roll 100 having a roll surface 142 for rolling a workpiece. The press roll 100 has a receiving chamber 110 formed therein, the receiving chamber 110 being adapted to receive a pressure medium to at least partially deform the roll surface 142 outwardly. The accommodating cavity 110 is formed in the press roll 100, and the pressure medium is introduced into the accommodating cavity 110 to enable the roll surface 142 of the press roll 100 to deform slightly outwards, so that the thickness of a rolled workpiece is compensated, and the thickness of the workpiece is more uniform.

The accommodating chamber 110 includes a surrounding chamber 111 and a communicating chamber 112, the surrounding chamber 111 is provided around the axis of the press roller 100, the press roller 100 is further provided with a medium flow passage 120, one end of the medium flow passage 120 extends to one end of the press roller 100 in the axial direction, the other end of the medium flow passage 120 communicates with the communicating chamber 112, and the communicating chamber 112 communicates with the surrounding chamber 111. Through setting up the chamber 111 of encircleing that encircles the axis setting of compression roller 100, to encircling the intracavity and leading in pressure medium, can make the whole week of compression roller 100 all outwards trace deformation, like this, at the in-process of continuous roll-in, the work piece can be better along its length direction's thickness homogeneity. One end of the medium flow path 120 extends to one end of the platen roller 100 in the axial direction to form a medium inlet 121 on one end of the platen roller 100 in the axial direction. In this way, the medium inlet 121 is not easily interfered with other components, so that pressure medium can be conveniently introduced into the medium flow channel 120 through the medium inlet 121. At this time, the medium flow channel 120 is disposed to extend along the axis of the pressing roller 100, so that the length of the medium flow channel 120 is shorter, so as to facilitate rapid feeding of the pressure medium, and reduce the preparation time for rolling. Through setting up intercommunication chamber 112 intercommunication medium runner 120 and encircle chamber 111 to in being convenient for make the pressure medium that lets in medium runner 120 enter into encircle the intracavity 111, and then make the roll-in face 142 of compression roller 100 outwards micro deformation, thereby compensate the thickness of work piece of roll-in, make the thickness of work piece more even.

The press roller 100 includes a press member 140 and a coupling member 150, and the press member 140 and the coupling member 150 are separately provided and coupled. The connection member 150 is provided with a protrusion 151, one end of the rolling member 140 is provided with a groove 141 along the axial direction of the rolling roller 100, the protrusion 151 is accommodated in the groove 141, and the outer surface of the protrusion 151 and the wall surface of the groove 141 together define the accommodating chamber 110. The connection member 150 is provided with a medium flow path 120, one end of the medium flow path 120 communicates with the communication chamber 112, and the other end of the medium flow path 120 extends to an outer surface of the connection member 150 to form a medium inlet 121. The protrusion 151 extends into the groove 141 and has a gap with the groove wall surface of the groove 141, so that the outer surface of the protrusion 151 and the groove wall surface of the groove 141 together define the accommodating cavity 110, which is beneficial to simplifying the manufacture and reducing the manufacturing cost. By arranging the medium flow channel 120 so as to facilitate the pressure medium to be introduced from the medium inlet 121, the pressure medium passes through the communication cavity 112 from the medium flow channel 120 to reach the surrounding cavity 111, and the rolling surface 142 of the press roll 100 is further slightly deformed outwards, so that the thickness of the rolled workpiece is compensated, and the thickness of the workpiece is more uniform.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A press roll, characterized in that the press roll is provided with a roll surface for rolling a workpiece, and a containing cavity is formed in the press roll and is used for containing a pressure medium so as to at least partially deform outwards;

the compression roller comprises a roller pressing piece and a connecting piece, wherein the roller pressing piece and the connecting piece are arranged in a split mode and are connected, and the roller pressing piece and the connecting piece jointly define the accommodating cavity.

2. The pressure roller of claim 1, wherein the receiving chamber comprises a surrounding chamber disposed about an axis of the pressure roller.

3. A press roll according to claim 2, characterized in that the extension direction of the encircling cavity is parallel to the axial direction of the press roll.

4. The press roll according to claim 2, wherein the spacing between the surrounding cavity and the roll surface in the radial direction of the press roll is L, satisfying: l is less than or equal to 60mm.

5. The press roll according to claim 4, wherein L.gtoreq.40 mm.

6. The press roll according to claim 5, wherein 45 mm.ltoreq.L.ltoreq.55 mm.

7. The press roll according to claim 2, wherein the surrounding cavity includes an inner cavity surface and an outer cavity surface disposed around an axis of the press roll, the outer cavity surface being located outside the inner cavity surface, a distance D between the inner cavity surface and the outer cavity surface in a radial direction of the press roll ₁ The method comprises the following steps: d is not less than 20mm ₁ ≤60mm。

8. The press roll according to claim 7, wherein 30 mm.ltoreq.D ₁ ≤50mm。

9. A pressure roller according to claim 2, wherein the pressure roller is provided with a media flow passage communicating with the surrounding cavity, one end of the media flow passage extending to an outer surface of the pressure roller to form a media inlet.

10. The nip roll of claim 9, wherein the media flow path extends in an axial direction of the nip roll, the receiving chamber further comprising a communication chamber, one end of the media flow path extending to one end of the nip roll in the axial direction, the other end of the media flow path communicating with the communication chamber, the communication chamber communicating with the surrounding chamber.

11. According to the weightsThe pressure roller as claimed in claim 10, wherein the medium flow path has a diameter D ₂ The method comprises the following steps: d is not less than 20mm ₂ ≤60mm。

12. The press roll according to claim 11, wherein 30 mm.ltoreq.D ₂ ≤50mm。

13. The pressure roller of claim 10, wherein a centerline of the media flow path coincides with an axis of the pressure roller.

14. The pressure roller of claim 10, wherein the cross section of the communication chamber is circular, the cross section being perpendicular to the axis of the pressure roller.

15. The press roll according to claim 10, wherein the communicating chamber includes a first chamber surface and a second chamber surface which are disposed opposite to each other in an axial direction of the press roll, a distance between the first chamber surface and the second chamber surface being D ₃ The method comprises the following steps: d is not less than 20mm ₃ ≤60mm。

16. The press roll according to claim 15, wherein 30 mm.ltoreq.D ₃ ≤50mm。

17. A press roll according to any one of claims 1-16, characterized in that two of said receiving cavities are formed in said press roll, both of said receiving cavities being arranged in the axial direction of said press roll.

18. The pressure roller according to claim 17, characterized in that the pressure roller includes a partition portion, two of the accommodation chambers are provided on both sides of the partition portion, respectively, in an axial direction of the pressure roller, the partition portion being configured to partition the two accommodation chambers.

19. A press roll according to claim 18, characterized in that the partition is located in the middle of the roll surface in the axial direction of the press roll.

20. The pressure roller of claim 18, wherein two of said receiving chambers are symmetrically disposed on both sides of said partition.

21. A press roll according to claim 17, characterized in that the press roll is provided with two medium flow channels, one end of one medium flow channel is correspondingly communicated with one accommodating cavity, the other end of the medium flow channel forms a medium inlet, and the two medium inlets are respectively positioned at two axial ends of the press roll.

22. The roll of claim 1, wherein an outer peripheral surface of the roll member forms the roll surface.

23. A press roll according to claim 1, characterized in that the connecting member is provided with a protrusion, and in the axial direction of the press roll, one end of the press roll is provided with a recess, in which the protrusion is accommodated, and the outer surface of the protrusion and the wall surface of the recess together define the accommodation chamber.

24. The pressure roller of claim 23, wherein the receiving chamber includes a surrounding chamber and a communicating chamber, the surrounding chamber in communication with the communicating chamber, the surrounding chamber disposed about an axis of the pressure roller;

the groove wall surface comprises a groove bottom surface and a groove side surface which surrounds the groove bottom surface, the outer surface of the convex part comprises an end surface and an outer peripheral surface which surrounds the end surface, the groove bottom surface and the end surface define the communication cavity, and the groove side surface and the outer peripheral surface of the convex part define the surrounding cavity.

25. A pressure roller according to claim 24, wherein said connecting member is provided with a medium flow passage, one end of which communicates with said communicating chamber, and the other end of which extends to an outer surface of said connecting member to form a medium inlet.

26. A pressure roller according to claim 25, wherein the end of said medium flow passage remote from said communication chamber extends to the end of said connecting member remote from the bottom surface of the groove in the axial direction of said pressure roller.

27. The press roll according to claim 23, wherein the connecting member includes a supporting portion and a connecting portion, the supporting portion and the protruding portion being located on both sides of the connecting portion, respectively, in an axial direction of the press roll, the connecting portion being connected with the press roll.

28. A press roll according to claim 23, wherein the press roll comprises two connecting members, the grooves are provided at opposite ends of the press roll member in the axial direction of the press roll, the protrusions of the two connecting members are respectively accommodated in the two grooves, and the outer surface of one of the protrusions and the wall surface of one of the grooves define one of the accommodating chambers.

29. The press roll according to claim 28, wherein the press roll member includes a partition portion, and two grooves are located on both sides of the partition portion, respectively, in an axial direction of the press roll.

30. A roll-in system, comprising:

a press roll according to any one of claims 1-29;

And the medium supply device is communicated with the accommodating cavity and is used for supplying the pressure medium into the accommodating cavity.

31. The roll-in system of claim 30, further comprising a pressure adjustment device configured to adjust a pressure of the pressure medium within the containment chamber.