CN117046978A

CN117046978A - Stretching assembly and stretching device

Info

Publication number: CN117046978A
Application number: CN202310780084.4A
Authority: CN
Inventors: 杨立华
Original assignee: Lanjun New Energy Technology Co ltd
Current assignee: Lanjun New Energy Technology Co ltd
Priority date: 2023-06-28
Filing date: 2023-06-28
Publication date: 2023-11-14

Abstract

The application relates to a stretching assembly and a stretching device. The pole piece can pass through the stretching assembly and enable the coating area and the blank area to correspond to the supporting roller and the stretching roller respectively. The portion of the stretching roller in contact with the pole piece can protrude from the surface of the supporting roller, so that larger tension is applied to the blank area of the pole piece to realize extension. When the material of the pole piece changes, the driving piece can drive the mandrel to rotate around the axis of the mandrel. At this time, the eccentric wheel also rotates along with the mandrel, so that the axis of the outer ring of the eccentric wheel, that is, the axis of the stretching roller 140 also rotates around the axis of the mandrel, and the height of the contact part of the stretching roller and the pole piece protruding from the surface of the supporting roller is adjusted. Therefore, the stretching effect of the stretching assembly on the blank area of the pole piece can be adjusted in real time by driving the mandrel to rotate through the driving piece, so that the adjustment is more convenient.

Description

Stretching assembly and stretching device

Technical Field

The application relates to the technical field of automation, in particular to a stretching assembly and an extending device.

Background

In the production process of lithium batteries, the electrode sheet needs to be rolled. The pole piece comprises a coating area and a blank area, and the tension of the coating and the foil is different, so that the blank area of the pole piece after rolling has larger tensile stress, and the edge of the foil in the blank area is wrinkled.

To solve this problem, it is necessary to provide a tension mechanism for pre-stretching the pole piece before or after rolling. The tension mechanism comprises a tension roller, and a plurality of layers of material belts are wound at preset positions of the tension roller to form annular bulges. When the pole piece passes through the tension roller, the annular bulge is contacted with the blank area of the pole piece. Thus, most of the tension roller is applied to the blank area of the pole piece, thereby enabling the foil of the blank area to be "pulled apart" to achieve pre-stretching.

Since the incoming material of the pole piece is changed frequently, the height of the annular protrusion needs to be adjusted frequently to realize matching. Currently, the height adjustment of the annular projection depends on manual operations, which can be achieved by adjusting the number of layers or thickness of the wound strip. When each time of adjustment, the requirement can be met only by trying for different material belt thicknesses and layer numbers, and the adjustment is very inconvenient due to the narrow operation space.

Disclosure of Invention

Accordingly, it is desirable to provide a stretching assembly and an extension device that facilitate adjustment according to incoming material changes.

The stretching assembly comprises a mandrel, a supporting roller, an eccentric wheel and a stretching roller, wherein the supporting roller is rotatably sleeved on the mandrel and is coaxially arranged with the mandrel; the eccentric wheel is provided with an inner ring and an outer ring eccentrically arranged relative to the inner ring, and the inner ring is fixedly sleeved on the mandrel and is coaxially arranged with the mandrel; the stretching roller is rotatably sleeved on the outer ring and is coaxially arranged with the outer ring;

the pole piece can pass through the stretching assembly in a winding way, and the coating area and the blank area correspond to the supporting roller and the stretching roller respectively.

In one embodiment, the support rollers and the stretching rollers are alternately arranged along the axial direction of the mandrel.

In one embodiment, the two ends of the mandrel are provided with first bearings.

In one embodiment, the support roller is rotatably sleeved on the mandrel through a second bearing, and the stretching roller is rotatably sleeved on the outer ring through a third bearing.

In one embodiment, the two side edges of the stretching roller are formed with chamfer structures extending along the circumferential direction.

In one embodiment, the surface of the stretching roller is coated with a wear layer.

In one embodiment, the wear-resistant layer comprises a plurality of layers of material strips sleeved with each other, and the widths of the layers of material strips are gradually reduced from inside to outside so as to form chamfer structures on two side edges of the stretching roller.

An extension device, comprising:

a stretching assembly as in any one of the preceding preferred embodiments; a kind of electronic device with high-pressure air-conditioning system

The driving piece is in transmission connection with the mandrel, and the mandrel can rotate around the axis of the mandrel under the driving of the driving piece.

In one embodiment, the driving member is a servo motor, and a rotating shaft of the servo motor is connected with the mandrel through a coupling.

In one embodiment, the device further comprises a first passing roller and a second passing roller which are respectively positioned at the upstream and downstream of the stretching assembly, and the pole piece can pass through the first passing roller and the second passing roller so as to form a wrap angle on the stretching assembly.

The stretching assembly and the stretching device enable the pole piece to pass through the stretching assembly and enable the coating area and the blank area to correspond to the supporting roller and the stretching roller respectively. The portion of the stretching roller in contact with the pole piece can protrude from the surface of the supporting roller, so that larger tension is applied to the blank area of the pole piece to realize extension. When the material of the pole piece changes, the driving piece can drive the mandrel to rotate around the axis of the mandrel. At this time, the eccentric wheel also rotates along with the mandrel, so that the axis of the outer ring of the eccentric wheel, namely the axis of the stretching roller, also rotates around the axis of the mandrel, and the height of the part, which is contacted with the pole piece, of the stretching roller protruding from the surface of the supporting roller is adjusted. Therefore, the stretching effect of the stretching assembly on the blank area of the pole piece can be adjusted in real time by driving the mandrel to rotate through the driving piece, so that the adjustment is more convenient.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view showing a partial structure of an extension device according to a preferred embodiment of the present application;

fig. 2 is a front view of the extension device of fig. 1;

FIG. 3 is a cross-sectional view of the extension device of FIG. 2 taken along line A-A;

FIG. 4 is a schematic view of the structure of the stretching assembly of the stretching apparatus shown in FIG. 1;

FIG. 5 is a cross-sectional view of the stretching assembly of FIG. 4;

FIG. 6 is a schematic view of the eccentric in the drawing assembly of FIG. 4;

fig. 7 is a front view of the extension device of fig. 1 in another use state;

FIG. 8 is a cross-sectional view of the extension device of FIG. 7 taken along E-E;

fig. 9 is an enlarged schematic view of a stretching roller in another embodiment.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1, 2 and 3, the present application provides an extension device 10 and a stretching assembly 100. The stretching device 10 includes a stretching assembly 100 and a driving member 200.

The pole piece 20 to be extended is able to pass around the stretching assembly 100. Specifically, the pole piece 20 includes a coating region 21 and a blank region 22. The coating region 21 and the blank region 22 are juxtaposed in the width direction of the pole piece 20, and both extend in the length direction of the pole piece 20.

Referring to fig. 4 and 5, the stretching assembly 100 according to the preferred embodiment of the application includes a mandrel 110, a support roller 120, an eccentric 130, and a stretching roller 140.

Mandrel 110 is typically formed of stainless steel and has high mechanical strength. The driving member 200 is in transmission connection with the mandrel 110, and the mandrel 110 can rotate around the axis of the driving member 200. The two ends of the mandrel 110 are generally rotatably mounted on a frame (not shown) of the extension device 10, and specifically in this embodiment, the two ends of the mandrel 110 are provided with first bearings 150, and the first bearings 150 cooperate with bearing seats (not shown) to rotatably mount the mandrel 110 on the frame, so that the mandrel 110 is more stable and smoother when rotating.

The driving member 200 may be a motor, a rotary cylinder, or the like. Referring to fig. 3 again, in the embodiment, the driving member 200 is a servo motor, and a rotating shaft of the servo motor is connected to the mandrel 110 through a coupling 300. The coupling 300 enables a rigid connection between the shaft of the servomotor and the spindle 110. Moreover, the number of rotations of the servo motor can be precisely controlled by an electric control signal. Therefore, the rotation angle of the mandrel 110 can be accurately controlled under the driving of the servo motor.

The support roller 120 is rotatably sleeved on the mandrel 110 and is coaxially arranged with the mandrel 110. The support roller 120 is annular and is rotatable around the spindle 110. In particular, in the present embodiment, the support roller 120 is rotatably sleeved on the mandrel 110 through the second bearing 160, so that the support roller 120 is more stable and smoother when rotating.

Referring to fig. 6, the eccentric 130 has an inner ring (not shown) and an outer ring (not shown). The eccentric wheel 130 is ring-shaped and is provided with a circular mounting hole 131. The inner wall of the mounting hole 131 constitutes the inner ring, the center of which is denoted as O1, and the outer circumferential profile of the eccentric 130 constitutes the outer ring, the center of which is denoted as O2. The outer ring is eccentrically arranged relative to the inner ring, i.e. O1 and O2 do not coincide. For convenience of subsequent analysis, four points are uniformly marked on the circumference of the outer ring of the eccentric 130, respectively, C1 (the point closest to the inner ring), C3 (the point farthest from the inner ring), C2 and C4 (respectively, located at the middle between C1 and C3).

Further, the inner ring of the eccentric wheel 130 is fixedly sleeved on the mandrel 110 and is coaxially arranged with the mandrel 110. It can be seen that eccentric 130 is capable of rotating with spindle 110. Since the inner ring of the eccentric wheel 130 is coaxially disposed with the spindle 110, the center O1 of the inner ring coincides with the axis of the spindle 110, and the center O2 of the outer ring can rotate around the axis of the spindle 110 with the rotation of the spindle 110.

Specifically in this embodiment, the inner ring of eccentric 130 is secured to spindle 110 by flat key 170. Flat key grooves (not shown) are formed in positions of the inner ring corresponding to the surface of the mandrel 110, and flat keys 170 are clamped into the flat key grooves to fix the eccentric wheel 130 and the mandrel 110.

The stretching roller 140 has a circular ring shape. The stretching roller 140 is rotatably sleeved on the outer ring of the eccentric wheel 130 and is coaxially arranged with the outer ring. That is, the axis of the stretching roller 140 coincides with the center O2 of the outer ring. In this embodiment, the stretching roller 140 is rotatably sleeved on the outer ring through the third bearing 180, so that the stretching roller 140 is more stable and smoother when rotating around the outer ring.

Referring again to fig. 1, the coating area 21 and the blank area 22 correspond to the support roller 120 and the stretching roller 140, respectively, as the pole piece 20 passes around the stretching assembly 100. As the pole piece 20 is carried, friction is generated between the coating area 21 and the surface of the support roller 120, so that the support roller 120 is driven to rotate around the mandrel 110; while the blank 22 generates friction with the surface of the stretching roller 140, thereby driving the stretching roller 140 to rotate around the outer ring of the eccentric 130.

In particular, in the present embodiment, the support rollers 120 and the stretching rollers 140 are alternately arranged along the axial direction of the mandrel 110. The support roller 120 and the stretching roller 140 are arranged in a manner corresponding to the distribution of the coating area 21 and the blank area 22 on the pole piece 20. As shown in fig. 5, for example, four support rollers 120 are disposed at intervals along the axial direction of the mandrel 110, and one stretching roller 140 is disposed between two adjacent support rollers 120.

When the material of the pole piece 20 changes, the driving piece 200 drives the mandrel 110 to rotate around the axis of the mandrel. At this time, the eccentric wheel 130 will also rotate with the mandrel 110, so that the center of the outer ring of the eccentric wheel 130, that is, the axis of the stretching roller 140, also rotates around the axis of the mandrel 110, and the height of the portion of the stretching roller 140 contacting the pole piece 20 protruding from the surface of the supporting roller 120 can be adjusted. Therefore, the stretching effect of the stretching assembly 100 on the blank area 22 of the pole piece can be adjusted in real time by driving the mandrel 110 to rotate by the driving member 200, so that the adjustment is more convenient.

As shown in fig. 2 and 3, the point of entry of the coating region 21 into the backup roll 120 is denoted as point B, the point of entry of the backup roll 120 is denoted as point D, and the point of contact of the coating region between point B and point D with the backup roll 120 is denoted as point C. When the driving member 200 drives the mandrel 110 to rotate, the center O2 of the outer ring of the eccentric wheel 130, that is, the axis of the stretching roller 140 will also rotate around the center O1 of the inner ring of the eccentric wheel 130. And the angle formed by the C point, the O1 point and the C1 point is +.C1O1C. When the eccentric 130 rotates to make the point C1 closest to the contact point C, that is, the included angle C1O1C is equal to 0 °, the height of the portion of the stretching roller 140 in contact with the pole piece 20 (the portion between the contact points B and D) protruding from the surface of the supporting roller 120 is minimized, and at this time, the stretching of the blank region 22 of the pole piece 20 by the stretching roller 140 is weakest or has no stretching effect.

As shown in fig. 7 and 8, when the eccentric 130 rotates to make the point C1 farthest from the contact point C, that is, the included angle +.c1o1c is equal to 180 °, the portion of the stretching roller 140 in contact with the pole piece 20 protrudes to the greatest extent from the surface of the supporting roller 120, and at this time, the stretching effect of the stretching roller 140 on the blank region 22 of the pole piece 20 is strongest.

The driving member 200 can change the included angle C1O1C between 0 ° and 180 ° by driving the mandrel 110 to rotate. And the included angle C1O1C is different, and the corresponding stretching roller 140 protrudes from the surface of the supporting roller 120 by different heights. It can be seen that different stretching effects can be achieved by controlling the rotation angle of the mandrel 110 by the driving member 200.

In the present embodiment, both side edges of the stretching roller 140 are formed with chamfer structures 141 extending in the circumferential direction. When the stretching roller 140 abuts against the blank 22, the chamfer structure 141 can prevent the edge of the stretching roller 140 from generating larger friction with the blank 22, so as to prevent the stretching roller 140 from propping the pole piece 20 open when stretching the blank 22.

To prevent the stretching roller 140 from being rapidly worn during operation, and thereby extend the service life of the stretching assembly 100 and the extension device 10, the stretching roller 140 may be formed of a wear resistant material such as ceramic. At this time, the chamfer structures 141 may be machined at both side edges of the stretching roll 140 by cutting and grinding.

Referring to fig. 9, in other embodiments, a wear-resistant layer 142 may be coated on the surface of the stretching roller 140 to prevent the stretching roller 140 from being worn rapidly during operation. The wear-resistant layer can be formed by using wear-resistant materials such as teflon, DLC (diamond-like carbon film) and ceramics. The wear-resistant layer 142 may be a multilayer structure or a single-layer structure.

More specifically, the wear layer 142 includes multiple layers of material strips 1421 that are nested within each other, with the widths of the multiple layers of material strips 1421 decreasing from the inside to the outside. Each layer of material strip 1421 is annular and is sleeved on the outer circumference of the stretching roller 140. Since the width of the web 1421 is narrower toward the outside, slopes are formed at both side edges of the abrasion-resistant layer 142, thereby forming the chamfer structures 141 at both side edges of the stretching roller 140.

In addition, in the present embodiment, the stretching device 10 further includes a first passing roller 400 and a second passing roller 500, and the first passing roller 400 and the second passing roller 500 are respectively located upstream and downstream of the stretching assembly 100. Pole piece 20 can be wound around first pass roller 400, then around stretching assembly 100, and finally around second pass roller 500 to form a wrap angle on stretching assembly 100.

The first passing roller 400 and the second passing roller 500 can better envelope the pole piece 20 on the surface of the stretching assembly 100, so that the contact area between the stretching roller 140 and the blank area 22 can be increased when the pole piece 20 passes through the stretching assembly 100, and the extending effect on the blank area 22 is further ensured.

The stretching assembly 100 and the stretching device 10 described above, the pole piece 20 can pass around the stretching assembly 100 and make the coating area 21 and the blank area 22 correspond to the support roller 120 and the stretching roller 140, respectively. The portion of the stretch roll 140 that contacts the pole piece 20 can protrude from the surface of the support roll 120, thereby applying a greater tension to the blank 22 of the pole piece 20 to effect stretching. When the material of the pole piece 20 changes, the driving piece 200 can drive the mandrel 110 to rotate around the axis of the mandrel. At this time, the eccentric wheel 130 will also rotate with the mandrel 110, so that the axis of the outer ring of the eccentric wheel 130, that is, the axis of the stretching roller 140, also rotates around the axis of the mandrel 110, and the height of the portion of the stretching roller 140 contacting the pole piece 20 protruding from the surface of the supporting roller 120 is adjusted. Therefore, the stretching effect of the stretching assembly 100 on the blank area 22 of the pole piece 20 can be adjusted in real time by driving the spindle 110 to rotate by the driving member 200, so that the adjustment is more convenient.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. The stretching assembly is characterized by comprising a mandrel, a supporting roller, an eccentric wheel and a stretching roller, wherein the supporting roller is rotatably sleeved on the mandrel and is coaxially arranged with the mandrel; the eccentric wheel is provided with an inner ring and an outer ring eccentrically arranged relative to the inner ring, and the inner ring is fixedly sleeved on the mandrel and is coaxially arranged with the mandrel; the stretching roller is rotatably sleeved on the outer ring and is coaxially arranged with the outer ring;

2. The stretching assembly of claim 1, wherein the support rollers alternate with the stretching rollers along the axial direction of the mandrel.

3. The stretching assembly of claim 1, wherein the mandrel is provided with first bearings at both ends.

4. The stretching assembly of claim 1, wherein the support roller is rotatably sleeved on the mandrel through a second bearing, and the stretching roller is rotatably sleeved on the outer ring through a third bearing.

5. The stretching assembly of claim 1, wherein both side edges of the stretching roller are formed with chamfer structures extending in a circumferential direction.

6. The stretching assembly of claim 1, wherein a surface of the stretching roller is coated with a wear layer.

7. The stretching assembly of claim 6, wherein the wear layer comprises a plurality of layers of material strips nested within each other, and wherein the widths of the plurality of layers of material strips decrease from inside to outside to form a chamfer structure at both side edges of the stretching roller.

8. An extension device, comprising:

a stretching assembly as claimed in any one of the preceding claims 1 to 7; a kind of electronic device with high-pressure air-conditioning system

9. The extension device of claim 8, wherein the driving member is a servo motor, and a rotating shaft of the servo motor is connected with the mandrel through a coupling.

10. An extension device according to claim 8, further comprising first and second pass rollers upstream and downstream of the stretching assembly, respectively, through which a pole piece can be passed to form a wrap angle on the stretching assembly.