JP3690637B2 - Ceramic roller drive structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drive structure for a ceramic roller used for conveying an object to be heat treated in a heat treatment furnace such as a roller hearth furnace.
[0002]
[Prior art]
Conventionally, a ceramic roller used for conveying an object to be heat treated in a roller hearth furnace or the like is connected to and supported by a metal drive shaft and is driven to rotate.
For example, FIG. 5 and FIG. 6 are both cross-sectional views showing a ceramic roller driving structure described in Japanese Utility Model Laid-Open No. 63-75793. In FIG. 5, one end of the cylindrical ceramic roller 101 (the same applies to the other end) is provided with a tapered portion 103 a on the tip side of the drive shaft 103 that is rotatably supported from a furnace body (not shown) by a bearing 102. It is arranged in contact. In this state, when the drive shaft 103 is rotationally driven, the ceramic roller 101 is also rotationally driven in the same direction.
[0003]
On the other hand, in FIG. 6, the cylindrical tip 203a of the drive shaft 203 rotatably supported from the furnace body by the bearing 202 is attached to one end of the cylindrical ceramic roller 201 (the same applies to the other end). By inserting and passing the pin 204, the drive shaft 203 and the ceramic roller 201 are fixed to each other. Accordingly, the ceramic roller 201 is supported by the drive shaft 203 and is driven to rotate according to the rotation of the drive shaft 203. In this structure, even if there is a slight shift (for example, about 2 mm) between the axis CL1 of the ceramic roller 201 and the axis CL2 of the drive shaft 203 due to warping or bending of the ceramic roller 201, this can be absorbed by the loose fitting state. Because it can, there is no hindrance to transmission of driving force.
[0004]
[Problems to be solved by the invention]
In the conventional ceramic roller driving structure shown in FIG. 5, when various types of ceramic rollers 101 having different inner diameters exist, various types of driving shafts 103 having different outer diameters of the tapered portions 103a must be prepared accordingly. Further, slippage is likely to occur due to wear at the contact portion between the ceramic roller 101 and the tapered portion 103a, and in order to prevent this, maintenance work for adjusting the position of the drive shaft 103 in the axial direction is necessary, which is troublesome. . On the other hand, in the conventional ceramic roller driving structure shown in FIG. 6, if the amount of play is too large, the ceramic roller 201 rotates greatly eccentrically, so the amount of play is naturally limited. Therefore, the inner diameter of the cylindrical tip 203a of the drive shaft 203 must be determined according to the outer diameter of the ceramic roller 201. As a result, when there are various outer diameters of the ceramic roller 201, various drive shafts 203 must be prepared.
As described above, in the conventional ceramic roller driving structure, it is practically impossible to make the driving shaft common regardless of the diameter of the ceramic roller, and thus the manufacturing efficiency is poor.
[0005]
In view of the conventional problems as described above, the present invention provides a drive structure for a ceramic roller that can be applied regardless of the diameter of the ceramic roller while driving force is reliably transmitted. Objective.
[0006]
[Means for Solving the Problems]
The ceramic roller driving structure of the present invention is supported at both ends by two support rollers so as to be rotatable with respect to the furnace body of the heat treatment furnace. a ceramic roller engagement portion is provided, wherein the ceramic roller separately, is rotatably supported with respect to the furnace body, loosely fitted in Rudake inserted in the axial directions with respect to the engaged portion In the drive direction, a drive shaft having an engaging portion that engages with the engaged portion is provided.
In the ceramic roller drive structure configured as described above, the ceramic roller and the drive shaft are supported separately from each other, and the engagement portion is engaged with the engaged portion having a fixed shape regardless of the outer diameter, thereby driving. The driving force of the shaft is transmitted to the ceramic roller.
[0007]
In the ceramic roller driving structure (Claim 1), the engaged portion is a metal member attached to the end face and having a polygonal hole, and the engaging portion is loosely fitted in the hole. It may be a polygonal columnar projection (claim 2).
In this case, the polygonal column is loosely fitted in the polygonal hole to transmit the driving force, and some eccentricity of the ceramic roller with respect to the driving shaft is absorbed by play.
[0008]
In the ceramic roller driving structure (Claim 2), the ceramic roller has a thin cylindrical shape, and the metal member may have a cap shape and be pinned to the outer peripheral surface of the end portion of the ceramic roller ( Claim 3).
In this case, the cap is fixed to the outer peripheral surface of the end portion of the ceramic roller by a pin. Therefore, the only processing required for the ceramic roller when attaching the cap is to make a pin hole.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 2 is a cross-sectional view of the furnace body 1 cut along a vertical plane orthogonal to the conveyance direction of the object to be heat treated (not shown). A cylindrical ceramic roller 2 penetrating the furnace body 1 horizontally is pivotally supported with respect to the furnace body 1 at both ends thereof. Both ends of the ceramic roller 2 protruding from the furnace body 1 are covered with metal covers 3 and 4, respectively. A drive shaft 5 is rotatably attached to the right cover 3 and a sprocket 6 is attached to the right end of the drive shaft 5. A chain 7 is stretched around the sprocket 6 and driven by a motor 8.
[0010]
FIG. 1A is a partially enlarged cross-sectional view showing a connection structure with the drive shaft 5 on the right end side of the ceramic roller 2. The furnace body 1 mainly includes a heat insulating material 1a, a skin metal 1b, and a cylindrical metal pipe 1c. A roller mounting seat 9 is attached to the right end side of the metal pipe 1c. A roller mounting plate 10 is mounted on the roller mounting seat 9, and two support rollers 11 are rotatably mounted on the roller mounting plate 10.
[0011]
FIG. 3 corresponds to a view in which only the support roller 11 and the ceramic roller 2 are seen from the line III-III in FIG. As shown in FIG. 3, the two support rollers 11 are in rolling contact with the ceramic roller 2, and support the ceramic roller 2 so as to be rotatable about its axis.
[0012]
Returning to FIG. 1, two holes 2 a are provided in the vicinity of the right end of the ceramic roller 2 in order to pass the pin 12. A metal cap 13 is crowned on the right end surface of the ceramic roller 2. (B) is a front view showing only the cap 13, and a square hole 13a is provided at the center. In addition, holes 13b for allowing the pins 12 to pass therethrough are provided on the upper and lower sides. With the cap 13 placed on the right end of the ceramic roller 2, the hole 13 b of the cap 13 and the hole 2 a of the ceramic roller 2 are aligned, the pin 12 is passed through, and the pin 12 is fixed with the nut 14, whereby the cap 13 Is fixed to the ceramic roller 2.
In addition, since the cap 13 is a metal and has a larger coefficient of thermal expansion than the ceramic roller 2, there is a possibility that the end of the ceramic roller 2 may be damaged due to thermal expansion when the cap 13 is fitted into the ceramic roller 2. Therefore, the cap 13 is preferably extrapolated to the ceramic roller 2.
[0013]
On the other hand, the cover 3 is provided with a hole 3a through which the drive shaft 5 is passed. In order to improve the mechanical strength around the hole 3a, the reinforcing member 15 having a hole 15a having the same size as the hole 3a is provided with the cover 3. It is fixed to. A cooling jacket 16 having a heat dissipation effect is fixed to the right side of the cover 3, and a cylindrical drive shaft support member 17 is fixed to the cooling jacket 16. The drive shaft 5 is rotatably supported via a bearing 18. The cooling jacket 16 is used only when the furnace temperature is high and the bearing 18 needs to be cooled.
[0014]
An oil seal 19 is mounted on the inner peripheral side of the cooling jacket 16 to prevent a gap from being formed with the drive shaft 5. The oil seal 19 is provided in order to enhance gas tightness and prevent gas leakage when the furnace is filled with atmospheric gas. The front end portion (left end portion) 5a of the drive shaft 5 is formed as a rectangular column slightly smaller than the hole 13a of the cap 13, and this portion engages with the hole 13a of the cap 13 so Power can be transmitted to the roller 2. The aforementioned sprocket 6 is attached to the right end portion of the drive shaft 5 and is prevented from coming off by a bolt 20 and a washer 21.
[0015]
The inner diameter (side length) of the hole 13 a of the cap 13 is formed to be, for example, about 2 mm larger than the outer diameter (side length) of the distal end portion 5 a at the left end of the drive shaft 5. Even if the axis of the ceramic roller 2 is slightly displaced, mutual engagement is possible within the range of 2 mm, and there is no problem in transmission of power. Further, even when there is no axial misalignment, since they are a quadrangular hole and a quadrangular prism, mutual engagement is always ensured, and slipping and drive efficiency are not reduced.
[0016]
In general, ceramic processing is not easy, and processing costs are also required. However, in the above-described embodiment, the processing applied to the end portion of the ceramic roller 2 is only two holes 2a. Therefore, the processing is simple, and the cost increase is hardly a problem. In addition, if the cap 13 is formed in which the shape of the hole 13a is constant and only the radial dimension is adjusted to the ceramic roller 2 having various outer diameters, the drive shaft 5 can be used regardless of the outer diameter of the ceramic roller 2. Can be connected. Since the cap 13 itself is made of metal and easy to process, it is easy to prepare a large number of caps 13 and the cost increase is very small. On the other hand, since the same thing can be used for the drive shaft 5 irrespective of the size of the ceramic roller 2, it can be used as a common member, which is convenient in manufacturing.
[0017]
In addition, although the hole 13a of the cap 13 and the tip 5a of the drive shaft 5 are illustrated as a quadrangle and a quadratic prism based on a square, a form based on a rectangle or a rhombus is also possible. Moreover, the shape based on polygon other than a rectangle may be sufficient. Further, various other engagement shapes (for example, a cross shape) are possible.
Furthermore, in the said embodiment, although it is the engagement form which makes the front-end | tip part 5a of the drive shaft 5 a convex part, and the hole 13a of the cap 13 is a recessed part, this may be a reverse relationship. That is, for example, a square hole may be provided at the tip of the drive shaft 5 and a quadrangular prism protrusion may be provided at a corresponding position of the cap 13.
[0018]
Moreover, (a) of FIG. 4 is sectional drawing of the edge part vicinity of the ceramic roller 22 different from the said embodiment, (b) is a front view. The ceramic roller 22 has a shape in which an end is closed in a bag shape, and a square hole 22a is provided at the center thereof. The tip 5a of the drive shaft 5 is directly engaged with the hole 22a.
Such a form is advantageous because mass production is difficult with the current ceramic member manufacturing technique, but the number of members is reduced in that the cap 13 can be omitted.
[0019]
【The invention's effect】
The present invention configured as described above has the following effects.
According to the ceramic roller driving structure of the first aspect, the ceramic roller and the driving shaft are supported separately from each other, and the engaging portions are inserted in the axial direction with respect to the engaged portion having a fixed shape regardless of the outer diameter. Re by engaging with the engaged portion in the driving direction loosely in Rudake, the driving force of the drive shaft is transmitted to the ceramic roller, transmission of the driving force is always ensured, ceramic Regardless of the outer diameter of the roller, a fixed engagement form can be obtained. Further, even if there is some eccentricity of the ceramic roller with respect to the drive shaft, it is absorbed by play, so there is no hindrance to transmission of the drive force.
[0020]
According to the ceramic roller driving structure of claim 2, the polygonal column is loosely fitted in the polygonal hole to transmit the driving force, and even if there is some eccentricity of the ceramic roller with respect to the driving shaft, Therefore, there is no problem in transmitting the driving force.
[0021]
According to the driving structure of the ceramic roller of the third aspect, the cap is fixed to the ceramic roller by the pin, and the processing necessary for the ceramic roller when attaching the cap is only to make a pin hole, so that the processing is easy. .
[Brief description of the drawings]
FIG. 1 (a) is a partially enlarged sectional view showing a driving structure of a ceramic roller according to an embodiment of the present invention, and FIG. 1 (b) is a front view of a cap shown in FIG.
FIG. 2 is a cross-sectional view of a furnace body including the ceramic roller driving structure.
FIG. 3 is a diagram showing a positional relationship between a ceramic roller and a support roller in the ceramic roller driving structure.
FIGS. 4A and 4B are a cross-sectional view and a front view showing a shape of an end portion of a ceramic roller according to another embodiment. FIGS.
FIG. 5 is a cross-sectional view showing a conventional ceramic roller driving structure.
FIG. 6 is a cross-sectional view showing another conventional ceramic roller driving structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Furnace body 2 Ceramic roller 5 Drive shaft 5a Tip part 10 Roller mounting plate 11 Support roller 12 Pin 13 Cap 13a Hole 17 Drive shaft support member 18 Bearing 22 Ceramic roller 22a Hole

Claims (3)

A ceramic roller in which both ends are rotatably supported by two support rollers with respect to the furnace body of the heat treatment furnace, and one end face is provided with an engaged portion having a fixed shape regardless of the outer diameter;
Apart from the ceramic roller, is rotatably supported with respect to the furnace body, said the driving direction loosely in Rudake plugged into each other in the axial direction with respect to the engagement portion the engagement portion And a drive shaft having an engaging portion for engaging with the ceramic roller.   The engaged portion is a metal member attached to the end face and having a polygonal hole, and the engaging portion is a polygonal columnar protrusion that is loosely fitted into the hole. The drive structure for a ceramic roller according to claim 1.   The ceramic roller according to claim 2, wherein the ceramic roller has a thin cylindrical shape, and the metal member has a cap shape and is pinned to an outer peripheral surface of an end portion of the ceramic roller. Construction.

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