JP2022110444A - Roller device for heat treatment - Google Patents

Abstract

To suppress heat transfer to a drive shaft and furthermore to enable both ends of the drive shaft to follow thermal deformation of a roller body.SOLUTION: A roller device for heat treatment comprises: a hollow cylindrical roller body; drive shafts 41 provided at both ends of the roller body respectively and rotatably supported; and thermal deformation follow-up mechanisms 42 each of which is interposed between the roller body and the drive shaft 41 and follows thermal deformation of the roller body, the thermal deformation follow-up mechanisms 42 include a plurality of spring elements 421 provided along the circumferential direction of the drive shaft 41, and follow the thermal deformation of the roller body by deformation of the plurality of spring elements 421.SELECTED DRAWING: Figure 2

Description

The present invention relates to a heat treatment roller device.

A roller device for heat treatment such as an induction heating roller device has a hollow cylindrical roller body in which a heat-treated object contacts the outer peripheral surface, and a drive shaft is rotatably supported by bearings at both ends of the roller body. An axis is provided. Here, in the conventional heat-treating roller device, flange-like end plates provided on the drive shaft are fixed to both ends of the roller body.

In this heat-treating roller device, in addition to the configuration in which both ends of the roller body are constrained by the end plates, the thermal expansion difference due to the temperature difference between the end plates and the central portion of the roller body causes the both ends of the roller body to The diameter is reduced compared to the central portion of the main body. As a result, adverse effects such as a decrease in nip pressure are exerted on the heat-treated object.

Here, as shown in Patent Document 1, by providing an auxiliary heating device in the hollow at both ends of the roller body, the induction heating roller eliminates the difference in thermal expansion due to the temperature difference between the central portion of the roller body and the end plates. device is considered. In addition, in Patent Document 1, the shape of the end plate is conical to provide flexibility.

However, it is necessary to provide an auxiliary heating device in the roller device, which not only leads to an increase in the cost of the device, but also the driving shaft is heated by the auxiliary heating device, which causes a thermal effect on the bearings that support the driving shaft. It becomes a problem. If the end plate has a conical shape, the axial dimension of the roller device is correspondingly increased, and the flexibility of the installation space is reduced.

Japanese Patent No. 3556287

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and its main object is to enable both ends to follow the thermal deformation of the roller body while suppressing heat conduction to the drive shaft. It is.

That is, the heat-treating roller device according to the present invention includes a hollow cylindrical roller body, drive shafts provided at both ends of the roller body and rotatably supported, and a drive shaft between the roller body and the drive shaft. a thermal deformation follow-up mechanism intervening to follow thermal deformation of the roller body, wherein the thermal deformation follow-up mechanism has a plurality of spring elements provided along the circumferential direction of the drive shaft; The thermal deformation of the roller body is followed by the deformation of the spring element.

In such a device, a thermal deformation follow-up mechanism is interposed between the roller body and the drive shaft to follow the thermal deformation of the roller body, and the thermal deformation follow-up mechanism extends along the circumferential direction of the drive shaft. Since it has a plurality of spring elements provided at the same position, it is possible to follow the thermal deformation of the roller body by deforming the plurality of spring elements. As a result, both ends can follow the thermal deformation of the roller body. That is, the central portion and both ends of the roller body can be thermally deformed in the same manner, and problems such as a decrease in nip pressure with respect to the heat-treated object can be resolved. In addition, the roller body and the drive shaft are connected in the circumferential direction by a plurality of spring elements, restricting the path through which heat from the roller body is transferred to the drive shaft, thereby suppressing heat transfer to the drive shaft. be able to. Furthermore, since the end plate does not need to be conical as in the prior art, the flexibility of the installation space does not decrease.

As a specific embodiment of the plurality of spring elements, it is desirable that the plurality of spring elements have portions bent in the circumferential direction as they go radially outward. Here, as a mode of bending in the circumferential direction, in addition to a configuration in which the member is curved in the circumferential direction as it goes radially outward, a configuration in which the member is bent may be used.

In order to uniformly follow the thermal deformation of the roller body over the entire circumferential direction, it is desirable that the plurality of spring elements be provided so as to have a symmetrical shape in the circumferential direction.

In order to give a predetermined rigidity to the plurality of spring elements, it is desirable that the plurality of spring elements be plate-like bodies having a predetermined width in the axial direction of the drive shaft.

It is desirable that the width dimension of the plurality of spring elements on the drive shaft side increases toward the inner side in the radial direction. With this configuration, it is possible to ensure strength against bending rigidity.

In order to simplify the construction of the spring elements, it is desirable that the plurality of spring elements be constructed of annular ring-shaped members. When the spring elements are formed of ring-shaped members in this manner, each spring element can be formed by cutting a circular tube having a predetermined diameter, and the processing cost can be reduced.

The drive shaft preferably has a bearing portion supported by a bearing and a joint portion to which the plurality of spring elements are joined, and the joint portion preferably has a larger diameter than the bearing portion. With this configuration, the installation space for the plurality of spring elements can be reduced while maintaining the conventional bearing configuration. In addition, strength against bending rigidity can be ensured.

Rotating multiple spring elements can cause noise and heat dissipation problems. In order to preferably solve this problem, it is desirable that end plates are provided outside the plurality of spring elements in the axial direction to close the openings at both ends of the roller body.

It is desirable that a jacket chamber in which a gas-liquid two-phase heat medium is enclosed is formed within the thickness of the roller body. With this configuration, the temperature in the axial direction of the roller body becomes uniform, so that the central portion and both ends of the roller body can be thermally deformed in the same manner in conjunction with the configuration provided with the thermal deformation follow-up mechanism. can be done.

As an application example of the present invention, it is preferable that the induction heating roller device further includes an induction heating mechanism that is provided inside the roller body and causes the roller body to generate heat by induction.

According to the present invention configured in this way, it is possible to enable both ends to follow thermal deformation of the roller body while suppressing heat conduction to the drive shaft.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically the structure of the roller apparatus for heat processing of one Embodiment of this invention. 3A and 3B are a perspective view and a side view mainly showing a thermal deformation follow-up mechanism of the same embodiment; FIG. It is an expanded sectional view which shows the fixing structure of the support flange of the same embodiment. FIG. 5 is a cross-sectional view and a perspective view schematically showing a modification of the thermal deformation follow-up mechanism of the present invention; FIG. 4 is a cross-sectional view and a side view schematically showing a modification of the thermal deformation follow-up mechanism of the present invention; FIG. 4 is a cross-sectional view and a side view schematically showing a modification of the thermal deformation follow-up mechanism of the present invention; FIG. 10 is a perspective view and a side view schematically showing a modification of the thermal deformation follow-up mechanism of the present invention; FIG. 10 is a perspective view and a side view schematically showing a modification of the thermal deformation follow-up mechanism of the present invention; FIG. 10 is a perspective view and a side view schematically showing a modification of the thermal deformation follow-up mechanism of the present invention;

<One embodiment of the present invention>
An embodiment of a heat-treating roller device 100 according to the present invention will be described below with reference to the drawings.

The heat-treating roller device 100 is used in a continuous heat-treating process for sheet materials such as plastic films, paper, cloth, non-woven fabrics, synthetic fibers, metal foils, web materials, and continuous materials such as wire (thread) materials. be.

The heat-treating roller device 100 of this embodiment is an induction heating roller device, and as shown in FIG. An induction heating mechanism 3 is provided.

A journal 4 having a hollow drive shaft 41 is provided at both ends of the roller body 2, and the drive shaft 41 is rotatably supported by a machine base 9 via a bearing 8 such as a rolling bearing. The journal 4 has a drive shaft 41 , a thermal deformation following mechanism 42 provided on the drive shaft 41 , and a support flange 43 fixed to the axial end of the roller body 2 . Details of these will be described later. The roller body 2 is configured to be rotated by a driving force externally applied by a rotation driving mechanism (not shown) such as a motor. Further, in the side peripheral wall of the roller body 2 of the present embodiment, a plurality of jacket chambers 2A enclosing a gas-liquid two-phase heat medium extending in the longitudinal direction (rotational axis direction) are formed at regular intervals in the circumferential direction. there is

The induction heating mechanism 3 includes a cylindrical iron core 31 having a cylindrical shape and an induction coil 32 wound around the outer peripheral surface of the cylindrical iron core 31 .

Both ends of the cylindrical iron core 31 are supported by a support shaft 34 via a flange member 33. The support shafts 34 are inserted through the drive shafts 41, respectively, via bearings 10 such as rolling bearings. It is rotatably supported by the drive shaft 41 . As a result, the induction heating mechanism 3 is held stationary with respect to the base 9 (fixed side) inside the rotating roller body 2 .

An external lead wire L1 is connected to the induction coil 32, and a power supply circuit 5 for applying an AC voltage of a commercial frequency (50 Hz or 60 Hz) is connected to the external lead wire L1. .

When an AC voltage is applied to the induction coil 32 , an alternating magnetic flux is generated by the induction heating mechanism 3 , and the alternating magnetic flux passes through the side wall of the roller body 2 . Due to this passage, an induced current is generated in the roller body 2, and the induced current causes the roller body 2 to generate Joule heat. Moreover, the jacket chamber 2A makes the temperature distribution of the side peripheral wall of the roller body 2 uniform in the rotation axis direction.

Thus, in the heat treatment roller device 100 of this embodiment, the journals 4 at both ends in the axial direction are interposed between the roller main body 2 and the drive shaft 41 as shown in FIGS. A thermal deformation follow-up mechanism 42 is provided to follow the thermal deformation.

The thermal deformation follow-up mechanism 42 has a plurality of spring elements 421 provided along the circumferential direction of the drive shaft 41 (rotational direction of the roller body 2 ). It is configured to follow thermal deformation along the radial direction of the.

Specifically, the plurality of spring elements 421 have portions bent in the circumferential direction as they go radially outward. Also, the plurality of spring elements 421 are provided so as to be symmetrical in the circumferential direction.

The plurality of spring elements 421 of the present embodiment are belt-shaped bodies having a predetermined width in the axial direction of the drive shaft 41, and more specifically, are configured from ring-shaped members that form an annular shape when viewed from the side in the axial direction. It is

The plurality of spring elements 421 includes a plurality of first ring-shaped members 421 a fixed in contact with the outer peripheral surface of the drive shaft 41 and an inner peripheral portion of the support ring 43 fixed to the axial end of the roller body 2 . and a plurality of second ring-shaped members 421b fixed in contact with the surface. Also, the plurality of first ring-shaped members 421a and the plurality of second ring-shaped members 421b are fixed in contact with each other. As a fixing method, screw fixation or welding fixation may be used, but screw fixation is desirable in order to configure the plurality of spring elements 421 to be replaceable.

Here, in FIG. 2, the plurality of first ring-shaped members 421a are configured to be fixed in a state in which adjacent ones are also in contact with each other, but may be configured to be separated from each other. In addition, although the plurality of second ring-shaped members 421b are configured so that adjacent ones are separated from each other, they may be configured to be fixed while being in contact with each other.

The plurality of first ring-shaped members 421a are formed by cutting a circular pipe having the same predetermined diameter into a predetermined axial length. Also, the plurality of second ring-shaped members 421b are formed by cutting a circular pipe having the same predetermined diameter into a predetermined axial length. In this embodiment, the diameter of the second ring-shaped member 421b is larger than that of the first ring-shaped member 421a. Also good.

The support flange 43 , as shown in FIG. 3 , is fitted to the axial end of the roller body 2 and fixed to the roller body 2 with bolts 46 . Further, the support flange 43 is fitted so as to cover the axial end of the roller body 2 . With this configuration, when the axial end of the roller body 2 is thermally deformed, the support flange 43 receives the deformation, and the follow-up function of the plurality of spring elements 421 is exhibited.

Further, in this embodiment, end plates 44 are provided outside the plurality of spring elements 421 in the axial direction to close the openings at both ends of the roller body 2 . Specifically, the end plates 44 are provided so as to close the outer openings of the annular support flanges 43 , thereby closing the openings at both ends of the roller body 2 .

<Effects of this embodiment>
According to the heat treatment roller device 100 configured as described above, the roller main body 2 and the drive shaft 41 are connected to each other, and the thermal deformation follow-up mechanism 42 for following the thermal deformation of the roller main body 2 is provided. Since the driving shaft 41 has a plurality of spring elements 421 provided along the circumferential direction, the deformation of the plurality of spring elements 421 can follow the thermal deformation of the roller body 2 . As a result, both ends can follow the thermal deformation of the roller body 2 . That is, the central portion and both ends of the roller body 2 can be thermally deformed in the same manner, and problems such as a decrease in nip pressure with respect to the heat-treated object can be resolved. Further, since the roller body 2 and the drive shaft 41 are connected in the circumferential direction by a plurality of spring elements 421, the path through which the heat from the roller body 2 is transferred to the drive shaft 41 is restricted. can suppress heat conduction to Furthermore, since the end plate does not need to be conical as in the prior art, the flexibility of the installation space does not decrease.

In addition, in this embodiment, since the plurality of spring elements 421 are formed of ring-shaped members, the spring elements 421 can be easily manufactured, and the cost can be reduced particularly in small-lot manufacturing. In addition, since the axial length of the thermal deformation follow-up mechanism 42 can be made the same as that of the conventional end plate structure, the installation space for the induction heating mechanism 3 in the roller body 2 is not reduced.

Furthermore, since the support flange 43 to which the plurality of spring elements 421 are fixed is fitted over the axial end of the roller body 2 , the thermal expansion of the roller body 2 causes the gap between the roller body 2 and the support flange 43 to move. There is no gap between them, and on the contrary, it becomes tighter, so that the structure maintains robustness and high precision can be maintained even in a heated state.

<Modification 1 of the present invention>
FIG. 4 shows a modification of the invention. The heat-treating roller device 100 shown in FIG. 4 differs from the above embodiment in the configuration of the plurality of spring elements 421 .

Specifically, the heat-treating roller device 100 is configured such that the drive shaft side of the plurality of spring elements 421 increases in width as it goes radially inward. In the example of FIG. 4, the end surface of the first ring-shaped member 421a on the side opposite to the roller body 2 is formed as an inclined surface so that the width increases toward the inner side in the radial direction. The first ring-shaped member 421 a is fixed in a state in which the outer peripheral surface having the longest axial length is in tangential contact with the outer peripheral surface of the drive shaft 41 . By configuring in this way, bending rigidity can be ensured, and strength against the bending load received from the roller body 2 can be ensured.

<Modification 2 of the present invention>
FIG. 5 shows a modification of the invention. The heat-treating roller device 100 shown in FIG. 5 differs from the above embodiment in the configuration of the plurality of spring elements 421 . That is, in the above-described embodiment, the double structure of the first ring-shaped member 421a and the second ring-shaped member 421b was employed, but the heat treatment roller device 100 shown in FIG. is.

Specifically, in this heat treatment roller device 100, the drive shaft 41 has a bearing portion 41a supported by the bearing 8, and a joint portion 41b to which a plurality of ring-shaped members 421c, which are a plurality of spring elements 421, are joined. is doing. The joint portion 41b is a collar portion having a diameter larger than that of the bearing portion 41a. With this configuration, the installation space for the plurality of spring elements 421 can be reduced while maintaining the configuration of the bearing 8 as in the conventional case. In addition, strength against bending rigidity can be ensured.

In addition to the above configuration, as shown in FIG. 6, an inner support ring 45 may be provided inside the plurality of ring-shaped members 421c and fixed in a state in which the plurality of ring-shaped members 421c are in tangential contact. A plurality of ring-shaped members 421c are fixed to the outer peripheral surface of the inner support ring 45 in a tangent state. The inner support ring 45 is detachably fitted to the joint portion 41b of the drive shaft 41 and fixed by bolts. The configuration using this inner support ring 45 can be applied to the above-described embodiment, and can also be applied to the configuration of FIG.

<Modification 3 of the present invention>
FIG. 7 shows a modification of the invention. The heat-treating roller device 100 shown in FIG. 7 differs from the above embodiment in the configuration of the plurality of spring elements 421 .

Specifically, in this heat-treating roller device 100, the plurality of spring elements 421 are a plurality of main ring-shaped members 421d that are fixed in contact with both the outer peripheral surface of the drive shaft 41 and the inner peripheral surface of the support flange 43. and a plurality of secondary ring-shaped members 421e provided between the ring-shaped members 421d adjacent to each other and fixed in tangential contact therewith and fixed in tangent contact with the inner peripheral surface of the support flange 43. be done.

<Modification 4 of the present invention>
FIG. 8 shows a modification of the invention. The heat-treating roller device 100 shown in FIG. 8 differs from the above embodiment in the configuration of the plurality of spring elements 421 .

More specifically, in the heat-treating roller device 100, the plurality of spring elements 421 have an arc-wave plate shape, and a plurality of inner arc portions 421f fixed in contact with the outer peripheral surface of the drive shaft 41. , a plurality of outer arcuate portions 421g fixed in a state of tangential contact with the inner peripheral surface of the support flange 43, and a connecting portion 421h connecting the inner arcuate portion 421f and the outer arcuate portion 421g adjacent to each other. The plurality of inner arc portions 421f and the plurality of outer arc portions 421g are provided at regular intervals in the circumferential direction.

<Modification 5 of the present invention>
FIG. 9 shows a modification of the first embodiment. The heat-treating roller device 100 shown in FIG. 9 differs from the above embodiment in the configuration of the plurality of spring elements 421 .

Specifically, in the heat-treating roller device 100 , the plurality of spring elements 421 are plate-shaped and curved radially outward in the circumferential direction. Connect with the peripheral surface. The spring element 421 shown in FIG. 9 has an involute curve shape when viewed from the side. The shape of the spring element 421 is not limited to the involute curve shape, and may be an arc shape or a partially curved shape. Alternatively, the shape of the spring element 421 may be curved in the circumferential direction.

Further, the plurality of spring elements 421 may be spoke-like connecting the support flange 43 and the inner support ring 45 . The spring element 421 is, for example, in the shape of a straight rod, and connects the support flange 43 and the inner support ring 45 while being inclined with respect to the radial direction. This also allows the plurality of spring elements 421 to follow the thermal deformation of the roller body 2 .

Moreover, in the above-described embodiment, the spring element is composed of a ring-shaped member having an annular shape, but it may be a ring-shaped member having another shape, such as an elliptical shape. It may be a ring-shaped member having a rhombus shape or a rectangular shape arranged along.

Although the above embodiment shows an example in which the present invention is applied to an induction heating roller device, it may be a heat treatment roller device in which another heat source is accommodated inside the roller body.

In addition, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications are possible without departing from the spirit of the present invention.

100... Roller device for heat treatment (induction heating roller device)
2 Roller main body 2A Jacket chamber 3 Induction heating mechanism 41 Drive shaft 42 Thermal deformation follow-up mechanism 421 Plural spring elements 41a Bearing portion 41b・Joint portion 44 ・・・End plate

Claims (10)

a hollow cylindrical roller body;
a drive shaft provided at both ends of the roller body and rotatably supported;
a thermal deformation follow-up mechanism interposed between the roller body and the drive shaft and following thermal deformation of the roller body,
The thermal deformation follow-up mechanism has a plurality of spring elements provided along the circumferential direction of the drive shaft, and follows the thermal deformation of the roller body by deformation of the plurality of spring elements. roller device. 2. The heat-treating roller device according to claim 1, wherein said plurality of spring elements have portions bent in the circumferential direction as they go radially outward. 3. The heat-treating roller device according to claim 1, wherein said plurality of spring elements are provided so as to be symmetrical in the circumferential direction. 4. The thermal processing roller device according to claim 1, wherein said plurality of spring elements are plate-like bodies having a predetermined width in the axial direction of said drive shaft. 5. The heat-treating roller device according to claim 4, wherein the plurality of spring elements on the drive shaft side have widths that increase radially inward. 6. The heat-treating roller device according to claim 1, wherein said plurality of spring elements are formed of annular ring-shaped members. The drive shaft has a bearing portion supported by a bearing and a joint portion to which the plurality of spring elements are joined,
The heat-treating roller device according to any one of claims 1 to 6, wherein the joint portion has a diameter larger than that of the bearing portion. 8. The heat-treating roller device according to claim 1, wherein end plates are provided outside the plurality of spring elements in the axial direction to close the openings at both ends of the roller body. 9. The heat-treating roller device according to claim 1, wherein a jacket chamber in which a gas-liquid two-phase heat medium is enclosed is formed within the thickness of said roller body. 10. The heat-treating roller device according to claim 1, further comprising an induction heating mechanism provided inside said roller body to cause said roller body to generate heat by induction.

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