KR102278111B1 - Friction shaft for electrode film winding of secondary battery - Google Patents

Abstract

A disclosed friction shaft for winding an electrode film of a secondary battery includes: a rotating shaft; and a plurality of air friction members mounted on the outer circumferential surface of the rotating shaft and gripping a winding core via compressed air supplied from the rotating shaft. The air friction member includes: a plurality of pistons arranged to be rotationally symmetrical with respect to the rotational center of the rotating shaft and performing a linear reciprocating motion in the longitudinal direction of the rotating shaft; a piston housing to which compressed air is supplied from the rotating shaft and which supports the pistons such that the pistons can perform a linear reciprocating motion; a plurality of fixed jaws arranged to be rotationally symmetrical with respect to the rotational center of the rotating shaft and elastically supported by an elastic member surrounding the outer surface; a jaw housing disposed on one side of the piston housing; and a bearing housing disposed on one side of the jaw housing. At this time, the jaw housing is not exposed to the outside by means of the bearing housing. The present invention can prevent foreign materials from being mixed toward the pistons.

Description

Friction shaft for winding electrode film of secondary battery {FRICTION SHAFT FOR ELECTRODE FILM WINDING OF SECONDARY BATTERY}

The present invention (Disclosure) relates to a friction shaft for winding an electrode film of a secondary battery, which allows the winding cores to be gripped and rotated when the slitted electrode film for secondary batteries is wound on the winding core in the form of a roll.

Herein, background information related to the present invention is provided, which does not necessarily imply prior art (This section provides background information related to the present disclosure which is not necessarily prior art).

In general, in a conventional slitting machine (slitting machine), a plurality of unit materials slitted to a predetermined width, for example, a plurality of slitted electrode films for secondary batteries, etc., are wound with a uniform torque. A friction shaft is mounted and used.

Winding cores are sandwiched and gripped by the friction shaft, and the friction shaft rotates the gripped winding cores so that the electrode films for secondary batteries slitted on the outer peripheral surfaces of the winding cores are wound in a roll form.

On the other hand, as can be known by anyone, most of the friction shaft presses the hollow part of the winding core using air pressure to grip the winding cores.

That is, when air pressure is introduced into the friction shaft, the pistons protrude the fixing jaws in the radial direction by the air pressure. At this time, the fixing jaws hold the winding cores by pressing the hollow part of the winding cores.

However, the conventional friction shaft has a problem of interfering with the operation of the piston by mixing foreign matter to the side of the piston protruding the fixed jaw, there was a problem that the replacement cycle of the piston cannot be easily checked with the naked eye.

In addition, the conventional friction shaft had a problem in that air leaked when a scratch occurred due to foreign matter caught between the components when the components were combined, and there was another problem in that the entire amount of the components in the part where the air leaked had to be replaced.

Korean Patent Publication No. 10-1694472. Korean Patent Publication No. 10-1174456. Korean Patent Publication No. 10-1949863. Korean Patent Publication No. 10-20-0417275.

An object of the present invention (Disclosure) is to provide a friction shaft for winding an electrode film of a secondary battery that can prevent foreign substances from being mixed into the pistons.

An object of the present invention (Disclosure) is to provide a friction shaft for winding an electrode film of a secondary battery that can easily check the replacement cycle of the pistons with the naked eye.

An object of the present invention (Disclosure) is to provide a friction shaft for winding an electrode film of a secondary battery that prevents air from leaking between components.

Herein, a general summary of the present invention is provided, which should not be construed as limiting the scope of the present invention (This section provides a general summary of the disclosure and is not a comprehensive disclosure of its full scope or all of its features).

In order to solve the above problems, according to any one aspect of the various aspects describing the present invention, it is mounted on the outer circumferential side of the rotating shaft and the rotating shaft and holding the winding core through the compressed air supplied from the rotating shaft. In the friction shaft for winding the electrode film of a secondary battery having a plurality of air friction members, the air friction member is rotationally symmetrical with respect to the rotation center of the rotation shaft, and linearly reciprocating along the longitudinal direction of the rotation shaft. multiple pistons; a piston housing supplied with compressed air from the rotating shaft, and supporting the pistons in a linear reciprocating motion; A plurality of fixed jaws arranged to be rotationally symmetrical with respect to the rotational center of the rotating shaft and elastically supported by an elastic member surrounding the outer surface; a jaw housing disposed on one side of the piston housing; and a bearing housing disposed on one side of the jaw housing, but the jaw housing may not be exposed to the outside by the bearing housing.

In the friction shaft for winding the electrode film of a secondary battery according to an aspect of the present invention, the bearing housing includes: an inner ring portion provided in an annular ring shape; an outer ring portion surrounding the outer circumferential surface of the inner ring portion while being provided in an annular ring shape; A connection end connecting one side of the inner ring and one side of the outer ring; but, in the outer ring, cut-out holes for guiding the entry and exit of the fixed jaws are formed to extend from the other side of the outer ring to one side, and the jaw housing is wrapped by the outer ring. can

In the friction shaft for winding electrode film of a secondary battery according to an aspect of the present invention, a first elastic member seating groove into which an elastic member is fitted is formed on the outer surface of the fixing jaws, and an elastic member is formed on the outer peripheral surface of the outer ring part A second elastic member seating groove to be fitted may be formed along the outer circumferential surface of the outer ring portion, and the first elastic member seating groove and the second elastic member seating groove may be formed in a straight line when viewed from the side.

In the friction shaft for winding the electrode film of a secondary battery according to an aspect of the present invention, a pressing protrusion for pressing the other side of the jaw housing is integrally formed on one side of the pistons to protrude, and the other side of the jaw housing An insertion groove portion into which the pressing protrusion is inserted may be formed on the top.

According to the present invention, since the jaw housing is not exposed by the outer ring portion of the bearing housing when the winding core is gripped or the core is drawn out, it is possible to provide an effect of preventing foreign substances from being mixed into the pistons in advance. .

According to the present invention, since the pressure protrusion is integrally formed on one side of the piston in contact with the other side of the jaw housing, it is possible to visually check the degree of wear of the pressure protrusion during regular inspection, thereby making it easy to replace the pistons. It is possible to provide an effect that makes it possible to discriminate.

According to the present invention, it is possible to provide an effect of preventing the fixed jaws from moving left and right in advance because the cut-out holes formed in the outer ring of the bearing housing support the side surfaces of the fixing jaws.

1 is a cross-sectional view showing a friction shaft for winding an electrode film of a secondary battery according to the present invention.
Figure 2 is a perspective view showing any one of the air friction member shown in Figure 1;
Figure 3 is an exploded exploded perspective view showing the air friction member shown in Figure 2 by disassembling.
Fig. 4 is an enlarged cross-sectional view taken along line AA of Fig. 2;
Fig. 5 is an enlarged cross-sectional view taken along line BB of Fig. 2;
6 and 7 are views showing the operating state of the friction shaft according to the present invention, showing a state in which the air friction member grips the winding core.

Hereinafter, an embodiment in which the friction shaft for winding the electrode film of the secondary battery according to the present invention is implemented will be described in detail with reference to the drawings.

However, the intrinsic technical idea of the present invention cannot be said to be limited by the embodiments described below, and the following by those skilled in the art based on the intrinsic technical idea of the present invention. It is revealed that the range that can be easily suggested as a method of substitution or change of the embodiment described in is included.

In addition, since the terms used below are selected for convenience of explanation, in grasping the intrinsic technical idea of the present invention, they are not limited to the dictionary meaning and are appropriately interpreted as meanings consistent with the technical spirit of the present invention. it should be

Among the accompanying drawings, FIG. 1 is a view showing a friction shaft for winding an electrode film of a secondary battery according to the present invention, and the friction shaft 100 for winding an electrode film of a secondary battery according to the present invention is a rotating shaft 110 and , including a plurality of air friction members (120).

First, the rotating shaft 110 is installed on the winding part (not shown) side of a conventional slitting machine (not shown), and is connected to a driving means (not shown) provided in the winding part of the slitting machine to rotate. .

And the rotating shaft 110 transmits compressed air (air) to the air friction members 120 are installed on the outer circumferential surface side, and transmits a rotational driving force to the air friction members (120).

The rotating shaft 110 extends horizontally as shown, and an air supply passage 112 is formed therein.

The air supply passage 112 is formed to extend along the longitudinal direction of the rotation shaft 110 from the other end side of the rotation shaft 110 to one end side of the rotation shaft 110 .

At this time, the starting end side of the air supply passage 112 exposed to the other end side of the rotation shaft 110 is connected to an air supply source (not shown) such as a conventional air compressor.

And on the outer peripheral surface of the rotating shaft 110, a plurality of air distribution passages 114 for guiding the compressed air supplied from the air supply source toward the air friction members 120 installed on the outer peripheral surface of the rotating shaft 110 is formed.

That is, the compressed air supplied from the air supply source at the time of gripping the winding core (C; see FIGS. 6 and 7 ) is supplied to the air supply passage 112 formed in the rotation shaft 110 , and is supplied to the air supply passage 112 . The compressed air is supplied to each air friction member 120 through each air distribution passage 114 to the side.

The air friction members 120 are installed in close contact with each other on the outer circumferential surface of the rotation shaft 110 along the longitudinal direction of the rotation shaft 110 as shown in FIG. 1, and the rotation shaft 110 when the slit electrode film for a secondary battery is wound. ) to grip the winding cores (C) fitted to the air friction members 120 using the compressed air supplied through the.

And the air friction members 120 release the grip on the winding core (C) so as to take out the winding core (C) when the winding of the electrode film for a secondary battery is completed.

Among the accompanying drawings, FIGS. 2 to 5 are views showing any one of the air friction members shown in FIG. 1 .

2 to 5 , the air friction member 120 includes a plurality of pistons 122 and a piston housing 124 supporting the pistons 122 .

In addition, the air friction member 120 includes a plurality of fixing jaws 136 , and a jaw housing 144 and a bearing housing 140 supporting the fixing jaws 136 .

The pistons 122 are provided in a cylindrical shape extending horizontally along the longitudinal direction of the rotation shaft 110 as shown, and are rotationally symmetrical with respect to the rotation center of the rotation shaft 110 .

These pistons 122 are supported by the piston housing 124 to be linearly reciprocating along the longitudinal direction of the rotation shaft 110 .

And at one end of the pistons 122, a pressing protrusion 123 for pressing the other side of the jaw housing 144 is integrally formed to protrude, and whether the pistons 122 are replaced according to the degree of wear of the pressing protrusion 123 can be easily identified.

The piston housing 124 is provided in an annular ring shape having an inner circumferential surface and an outer circumferential surface, and the inner circumferential side is inserted into the outer circumferential side of the rotary shaft 110 to be installed on the rotary shaft 110 .

And on one side of the piston housing 124, cylinder chambers 126 into which the pistons 122 are linearly reciprocated are provided.

The cylinder chambers 126 extend horizontally from one side of the piston housing 124 to the other side of the piston housing 124 so that the pistons 122 can linearly reciprocate along the longitudinal direction of the rotating shaft 110 as shown. is formed

On the other hand, on the inner circumferential surface of the piston housing 124 in contact with the outer circumferential surface of the rotation shaft 110 , any one air distribution channel 114 and a first inflow channel 128 connected thereto are formed along the inner circumferential surface of the piston housing 124 .

In addition, a plurality of second inflow passages 130 are formed in the piston housing 124 to connect the first inflow passage 128 and the extended end side of each cylinder chamber 126 .

The second inflow passages 130 are branched from the annular first inflow passage 128 in the radial direction of the first inflow passage 128 and are individually connected to the cylinder chamber 126 .

That is, the compressed air guided to the air supply flow path 112 when the winding core C fitted into the air friction members 120 is gripped is each air friction member 120 through each air distribution flow path 114 . Compressed air introduced into the first inflow passage 128 of the , and introduced into the first inflow passage 128 is introduced into the extended end side of each cylinder chamber 126 through each of the second inflow passages 130 .

At this time, the compressed air flowing into the extended end side of each cylinder chamber 126 applies pressure to the pistons 122 to protrude the pistons 122 to the outside of the cylinder chambers 136 .

And each of the pistons 122 protruding to the outside of the cylinder chamber 126 is the restoring force of the elastic member 138 that elastically supports the fixing jaws 136 when the compressed air flowing into the extension end of the cylinder chamber 126 is lost. are respectively inserted into the cylinder chamber 126 by the

On the other hand, a plurality of rolling balls 132 are rotatably mounted on the outer circumferential surface of the piston housing 124 , and these rolling balls 132 are easily inserted into or withdrawn from the air friction member 120 by the winding cores (C). guide you to

Here, the configuration and action of the rolling balls 132 that are mounted on the piston housing 124 to guide the winding cores C, and the connection relationship with the piston housing 124 are well-known techniques, so a detailed description thereof will be omitted.

And the first collar 166 is fitted between the inner peripheral surface of the piston housing 124 and the rotation shaft 110 .

The other side of the first collar 166 is exposed to the other side of the piston housing 124 as shown, and the other side of the exposed first collar 166 is attached to the bearing housing 140 in another air friction member 120 . ) is inserted into the inner circumferential side to support the bearing 142 .

The fixing jaws 136 are provided in a substantially block shape as shown, and are disposed to be rotationally symmetrical with respect to the center of rotation of the rotation shaft 110 , like the pistons 122 .

And the fixing jaws 136 are tightened by the annular elastic member 138 fitted in the first elastic member seating grooves 137 formed on the outer surface of the fixing jaw 136 so as to surround the outer surface of the fixing jaws 136 . It is elastically supported between the housing 144 and the bearing housing 140 .

That is, the fixed jaws 136 extend the elastic member 138 by the jaw housing 144 moving toward the bearing housing 140 when the winding cores C fitted to the air friction members 120 are gripped. The housing 144 and the bearing housing 140 protrude radially outward to press and hold the hollow portion (inner circumferential surface) of the winding cores (C).

And when the compressed air flowing into the extension end of each cylinder chamber 126 is lost, the fixing jaws 136 are radially inside the bearing housing 140 and the jaw housing 144 by the restoring force of the elastic member 138 . is returned At this time, the jaw housing 144 is moved to one side of the piston housing 124 by the returning fixed jaws 136 .

Here, the elastic member 138 may be a conventional tension coil spring formed in an annular shape.

The jaw housing 144 is disposed on one side of the piston housing 124 , and the bearing housing 140 is disposed on one side of the jaw housing 144 .

The bearing housing 140 has an inner ring portion 140a provided in an annular ring shape as shown, and an outer ring portion 140b and an inner ring portion (140b) and an inner ring portion ( It includes a connection end 140c connecting one side of 140a) and one side of the outer ring portion 140b.

At this time, the bearing housing 140 is installed on the rotating shaft 110 via a bearing 142 interposed between the inner peripheral surface side of the inner ring part 140a and the outer peripheral surface of the rotating shaft 110, and the bearing 142 and the piston housing ( The second collar 168 is fitted to the rotation shaft 110 so as not to interfere with the pistons 122 between the 124 .

And in the outer ring portion 140b of the bearing housing 140, cut-out holes 141a for guiding the entry and exit of the fixing jaws 136 are formed to extend from the other side of the outer ring portion 140b to one side, and the outer ring portion 140b On the outer circumferential surface, a second elastic member seating groove 141b into which the elastic member 138 is fitted is formed along the outer circumferential surface of the outer ring portion 140b.

Here, the second elastic member seating groove 141b formed in the outer ring portion 140b of the bearing housing 140 and the first elastic member seating groove 137 formed in the fixing jaws 136 form a straight line when viewed from the side. formed to achieve

The jaw housing 144 is provided in an annular ring shape having an inner circumferential surface and an outer circumferential surface, and the inner circumferential side is fitted to the outer circumferential side of the second collar 168 and at the same time is installed by the operation of the pistons 122 toward the bearing housing 140 side. It is moved and is movably installed toward the piston housing 124 by the restoring force of the elastic member 138 .

In addition, the jaw housing 144 is installed so as not to be exposed to the outside of the bearing housing 140 surrounded by the outer ring portion 140b of the bearing housing 140 .

On the other hand, on the outer circumferential surface of the jaw housing 144, the fixed jaws 136 are formed with sliders 146 that allow them to enter and exit through the cutout holes 141a formed in the outer ring portion 140b of the bearing housing 140 .

The sliders 146 are formed to be rotationally symmetrical with respect to the center of the jaw housing 144 to face the cut-out holes 141a, and the bottom of each slider 146 is the bearing housing 140 of the jaw housing 144. ) when moving to the side, the fixing jaws 136 protrude radially outward through the cut-out holes 141a formed in the outer ring portion 140b of the bearing housing 140, and the fixing jaws 136 by the restoring force of the elastic member 138. ) is formed as a first inclined surface 148 such that the jaw housing 144 moves toward the piston housing 124 when descending to the lower portion of the cut-out holes 141a.

In other words, the bottom of the slider 146 is provided as a first inclined surface 148 whose inclination is gradually lowered from a position adjacent to the other side of the jaw housing 144 to one side of the jaw housing 144, and the slider 146 is ) of the bottom, that is, the inner side of each of the fixing jaws 136 in contact with the first inclined surface 148 and the other side of the fixing jaw 136 to one side of the fixing jaw 136. 2 is provided as an inclined surface 150 .

That is, the winding cores C fitted to the air friction members 120 are moved along the first inclined surfaces 148 when the jaw housing 144 is moved toward the bearing housing 140 by the operation of the piston 122 during gripping. The second inclined surfaces 150 of each of the fixing jaws 136 are guided, whereby the fixing jaws 136 protrude radially outward through the incision hole 141a formed in the outer ring portion 140b of the bearing housing 140 . do.

In addition, when the fixing jaws 136 descend to the lower side of the cut-out holes 141a formed in the outer ring portion 140b of the bearing housing 140 by the restoring force of the elastic member 138, the second inclined surfaces 150 The first inclined surface 148 is guided, whereby the jaw housing 144 is moved to one side of the piston housing 124 .

And on the other side of the jaw housing 144 to which the pressing protrusions 123 of the pistons 122 are in contact, an insertion groove 145 into which the pressing protrusions 123 are not exposed is formed.

Meanwhile, between the first collar 166 and the piston housing 124 and between the second collar 168 and the piston housing 124, the first packing P1 and the second packing P2 are fitted for airtightness.

Hereinafter, a state of gripping the winding cores C using the friction shaft 100 for winding the electrode film of the secondary battery according to the present invention formed as described above will be briefly described.

In order to grip the winding cores (C) on the friction shaft 100 according to the present invention, first, the hollow parts of the winding cores (C) are inserted into the outer surfaces of the air friction members 120 installed on the outer peripheral surface of the rotation shaft 110 . insert (see FIG. 6).

When the winding cores (C) are fitted as described above, the winding core (C) under the condition that the friction shaft 100 according to the present invention is installed on the winding part (not shown) side of the slitting machine (not shown) ) to supply compressed air to the rotating shaft 110 to hold them (see FIG. 7 ).

At this time, the compressed air supplied to the rotation shaft 110 is guided to the air supply flow path 112 and filled, and the compressed air guided to the air supply flow path 112 is each air flick through each air distribution flow path 114 . After being introduced into the first inflow passage 128 of the seal member 120 , it is introduced into the extended end side of each cylinder chamber 126 through each of the second inflow passages 130 .

And the compressed air introduced into each cylinder chamber 126 presses the pistons 122 to protrude the pistons 122, whereby the jaw housing 144 is moved to the bearing housing 140 side, and thus the bearing housing Each of the fixed jaws 136 by the jaw housing 144 moved to the 140 side is radially through the cutouts 141a formed in the outer ring portion 140b of the bearing housing 140 while extending the elastic member 138 . While protruding to the outside, the hollow part of the winding cores (C) is pressed and gripped.

On the other hand, when the winding of the slitted electrode film for a secondary battery is completed and the compressed air flowing into the cylinder chamber 126 is lost, the fixing jaws 136 by the restoring force of the elastic member 138 are attached to the winding core (C). While releasing the grip, it descends to the lower side of the cut-out holes 141a formed in the outer ring portion 140b of the bearing housing 140, and the jaw housing 144 is moved to one side of the piston housing 124, and the piston housing 124 ) The jaw housing 144 moved to the side inserts the pistons 122 into the cylinder chamber 126, respectively.

When the fixing jaws 136 release the grip on the winding cores (C) in this way, the friction shaft 100 according to the present invention is separated from the winding part of the slitting machine and then the slit film for secondary batteries is wound. Take out the winding cores (C).

The friction shaft 100 for winding the electrode film of the secondary battery according to the present invention formed in this way is the outer ring portion of the bearing housing 124, the jaw housing 144 when the winding core C is gripped or the winding core C is drawn out. Because it is not exposed by (140b), it is possible to prevent in advance that foreign substances are mixed into the pistons 122 side.

In addition, in the friction shaft 100 for winding the electrode film of the secondary battery according to the present invention, the pressure protrusion 123 is integrally formed on one side of the piston 122 in contact with the other side of the jaw housing 144 . During regular inspection, the degree of wear of the pressing protrusion 123 can be visually checked, thereby making it possible to easily determine whether the pistons 122 are replaced.

In addition, in the friction shaft 100 for winding the electrode film of the secondary battery according to the present invention, the cut-out holes 141a formed in the outer ring portion 140b of the bearing housing 140 support the side surfaces of the fixing jaws 136 . It makes it possible to prevent in advance the fixing jaws 136 from moving left and right.

In the foregoing, specific embodiments of the present invention have been described and shown, but it is common knowledge in the art that the present invention is not limited to the described embodiments, and that various modifications and variations can be made without departing from the spirit and scope of the present invention. It is self-evident to those who have Accordingly, such modifications or variations should not be individually understood from the technical spirit or point of view of the present invention, and modified embodiments should be said to belong to the claims of the present invention.

Claims (4)

In the friction shaft for winding the electrode film of a secondary battery having a rotating shaft and a plurality of air friction members mounted on the outer circumferential side of the rotating shaft and holding the winding core through the compressed air supplied from the rotating shaft,
The air friction member,
a plurality of pistons arranged to be rotationally symmetrical with respect to the rotational center of the rotational shaft and reciprocating linearly along the longitudinal direction of the rotational shaft;
a piston housing supplied with compressed air from the rotating shaft, and supporting the pistons to be linearly reciprocated;
a plurality of fixing jaws arranged rotationally symmetrically with respect to the rotation center of the rotation shaft and elastically supported by an elastic member surrounding the outer surface;
a jaw housing disposed on one side of the piston housing; and
Including; a bearing housing disposed on one side of the jaw housing;
The jaw housing is not exposed to the outside by the bearing housing,
The bearing housing is
an inner ring portion provided in an annular ring shape;
an outer ring portion surrounding an outer circumferential surface of the inner ring portion while being provided in an annular ring shape;
Containing; a connection end for connecting one side of the inner ring portion and one side of the outer ring portion;
In the outer ring portion, cut-out holes for guiding the entry and exit of the fixed jaws are formed to extend from the other side of the outer ring portion to one side, and the jaw housing is a friction shaft for winding an electrode film of a secondary battery wrapped by the outer ring portion.
delete The method according to claim 1,
A first elastic member seating groove into which the elastic member is fitted is formed on the outer surface of the fixing jaws,
On the outer circumferential surface of the outer ring, a second elastic member seating groove into which the elastic member is fitted is formed along the outer circumferential surface of the outer ring,
The friction shaft for winding the electrode film of the secondary battery in which the first elastic member seating groove and the second elastic member seating groove are formed in a straight line when viewed from the side.
The method according to claim 1,
At one end of the pistons, a pressing protrusion for pressing the other side of the jaw housing is integrally formed to protrude,
A friction shaft for winding an electrode film of a secondary battery in which an insertion groove portion into which the pressing protrusion is inserted is formed on the other side of the tank housing.

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