JPS60188623A - Rotor mounting mechanism - Google Patents

Abstract

PURPOSE:To eliminate a clearance between the inner diameter of a spacer and the projection of a spindle in heating to correct the concentricity and facilitate the accuracy control by loosely fitting the projection having large rate of expansion at the end face of a rotary shaft into a hole in the rotary center of a rotor and mounting radially expansively a rotor on a flange of the rotary shaft. CONSTITUTION:In a cylindrical hole 11a at the center of a side plate 11 of a drum 1 is cold mounted a cylindrical spacer 13 having coefficient of thermal expansion larger than that of the side plate 11. The inside of the spacer 13 engages a projection 14 of a spindle 4 to fasten the drum 1 to the spindle 4 with bolts 15. The inner diameter of the spacer 13 and the outer diameter of the projection 14 on the spindle 4 are spaced from each other in the normal temperature. Since the material of the spacer 13 has the coefficient of thermal expansion larger than that of the drum side plate 11 and spindle 4, the clearance present in the normal temperature between the spacer 13 and the projection 14 is offset in heating by the difference between the coefficients of thermal expansion of the spacer 13, drum side plate 11 and spindle projection 12 in the rise of temperature to provide concentricity between the spacer and spindle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating body attachment mechanism that can be applied to a centrifugal molding machine.

An example of a conventional centrifugal molding machine is explained with reference to FIG.
A cylindrical drum 1 is mounted on a bearing 3a fixed on a base 2.
and 3b, and the rotation of the motor 5 is controlled by pulleys 6a and 6b.
The rotation is transmitted by a transmission belt 7. Further, a heater 8 for heating is arranged on the outer periphery of the drum 1, and the drum 1 and the heater 8 are covered with a heat insulating box 9 to keep them warm. Then, a liquid material is injected into the inside of the drum 1, applied to the inner surface by the centrifugal force of rotation, and hardened by heat to obtain a film of the polymeric material.

Cantilever type drums are often used for material injection and product removal.

However, in such a device, the eccentricity of the center of the inner surface of the drum 1 with respect to the center of the shaft 4 is directly related to the accuracy of the product thickness.
It is desirable that the drum and spindle be integrated, but due to processing and maintenance issues, it is difficult to realize this. For this reason, a straight boss 4a or a tapered boss 4b type as shown in FIGS. 2 and 3 is used for the mounting portion of the drum 1 and the main shaft 4. Covering the entire device with the insulation box 9 is disadvantageous in terms of heat sensitivity and thermal efficiency, so the main shaft 4 is placed outside of the insulation box 9 to prevent a temperature difference between the drum 1 and the main shaft 4. It is inevitable that it will occur.

If the straight boss 4a type shown in FIG. 2 is attached, clearance is required for assembly into the drum, and the temperature difference makes the fit loose, resulting in eccentricity. Furthermore, in the joining method using a taper shown in FIG. 3, since the processing directions of the tapered part and the cylindrical surface are different, many man-hours are required for concentric processing and confirmation of the surface angle. Since it is taken out, there is a temperature difference in the axial direction, and temperature unevenness also occurs depending on the contact of the taber, so the surface angle is likely to be distorted and there is a risk that reliable fixation may not be ensured.

The present invention was proposed to solve the above-mentioned conventional drawbacks, and includes a protrusion formed coaxially on the end face of the rotating shaft, a flange formed near the end of the rotating shaft, and a center of rotation of the rotating body. a ring-shaped spacer made of a material having a coefficient of expansion larger than that of the projection and the rotating body, and installed between the projection and the rotating body; ,
It has a structure consisting of a bolt that attaches the rotating body to the flange part so that it can expand and contract in the radial direction, and by sandwiching different materials with a high coefficient of thermal expansion in the fitting part, it is possible to eliminate gaps in the fitting part during assembly at room temperature. It is possible to eliminate gaps and at the same time correct concentricity while heating.
Moreover, since the structure itself is simple, it is an object of the present invention to provide a mounting mechanism for a rotating body that is easy to work with and has effects such as easy control of accuracy.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows a sectional view of a drum mounting portion of a rotating body mounting mechanism according to an embodiment of the present invention. In the figure, the main shaft 4 has at its tip a protrusion 14 having a cylindrical outer surface for fitting, and a bolt tightening flange 12. The side plate 11 of the drum 1 has a cylindrical hole 11a in the center, and a cylindrical spacer 13 made of a material having a higher coefficient of thermal expansion than the side plate 11 is attached to this part by cooling. The inner surface of this spacer 13 is engaged with the protrusion 14 of the main shaft 4, and the drum 1 and the main shaft 4 are tightened together by bolts 15.

Next, the operation of the embodiment shown in FIG. 4 will be explained. After the spacer 13 is cold-fitted to the side plate 11 of the drum 1,
The inner diameter of the spacer 13 and the outer diameter of the protrusion 14 of the main shaft 4 are processed to provide a clearance for assembly and disassembly at room temperature.

As the material for the spacer 13, a material having a higher linear expansion coefficient than that for the drum side plate 11 and the main shaft 4 is used. As a result, during heating, the spacer 13, the drum side plate 11, the main shaft protrusion 12
Due to the difference in the coefficient of linear expansion, the gap that existed at room temperature is filled when the temperature is raised, resulting in concentricity. In the above embodiments, the spacer is tightly fitted to the drum side, but it may be tightly fitted to the main shaft to provide the necessary cold clearance between the spacer and the drum.

Since the present invention is configured as explained in detail above,
While leaving a gap for disassembly and assembly at room temperature, the gap is eliminated when heated, resulting in a concentric assembled state. Furthermore, since there is no clearance, the drum is stable against rotation and does not deform when bolts are tightened. Furthermore, since it does not have a tapered portion, it has the advantage of being easy to process.

[Brief explanation of the drawing]

FIG. 1 is a partial side view showing an example of a conventional rotating body mounting mechanism, FIGS. 2 and 3 are cross-sectional views showing a conventional main shaft mounting portion, and FIG. 4 is a diagram showing an embodiment of the present invention. FIG. 3 is a side sectional view of an example mounting mechanism for a rotating body. Explanation of main parts in the figure 1- Drum 4- Main shaft (rotating shaft) 11- Drum side plate 12- Port tightening flange (flange part) 11a.-
Hole 13-Spacer 14-Protrusion 15-Bolt Patent Applicant Mitsubishi Heavy Industries, Ltd.

Claims (1)

[Claims] A protrusion coaxially formed on the end face of the rotating shaft, a flange formed near the end of the rotating shaft, a hole cut at the center of rotation of the rotating body into which the protrusion fits loosely, the protrusion and A ring-shaped spacer made of a material having a coefficient of expansion greater than that of the rotating body and installed between the protrusion and the rotating body, and a bolt for attaching the rotating body to the flange so that it can expand and contract in a radial direction. A mounting mechanism for a rotating body characterized by: