JPH0627648Y2 - Rotating tube heating equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a rotary tube heating device applied to thermal spraying of ceramic tubes such as alumina and zirconia, brazing of steel tubes, and butt welding of steel tubes.

[Prior Art] When surface treatment is performed while rotating a conventional tube,
There is no method to heat from inside the tube.

[Problems to be solved by the device]

As described above, when the surface is processed while the tube is rotated, the melt is rapidly solidified, which causes many problems in the crystal of the metal structure and the processed surface.

[Means for Solving the Problems]

In order to solve the above problems, the present invention comprises a drive shaft and a receiving shaft with a conductive portion and an insulating portion, and a current is passed through the conductive portions of both shafts via a power feeding brush to heat a heating wire in a tube. It is a device. That is, in an apparatus for surface processing while rotating and heating various tubes, a rotating means connected to one end of the tube via a drive shaft and a bearing means supporting the other end of the tube on a bearing portion. And a heating means provided inside the hollow portion of the tube and covered with a heat-resistant sheet, and a power supply part for energizing from both ends of the heating means to insulate the drive shaft and the bearing means from each other. The present invention provides a heating device for a rotating tube, which comprises:

[Action]

Since the heating device for a rotating tube according to the present invention has the above-mentioned structure, the rotating tube is heated more evenly from the inside, and the heating temperature can be changed if necessary, so that the powder, which is a thermal spraying material, can be changed. When it collides with the tube surface as high-speed melting particles by the plasma jet, a dense sprayed coating is formed, and the residual stress of the coating itself can be reduced.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 is a conceptual diagram showing the overall configuration of a heating device for a rotary tube according to an embodiment of the present invention. FIG. 2 is a partial sectional view taken along the line II-II in FIG. 1 according to this embodiment. FIG. 3 is a vertical cross-sectional view showing the drive-side shaft structure of the heating apparatus according to this embodiment. Fourth
The drawing is a vertical cross-sectional view showing a non-driving side shaft configuration of the heating apparatus according to the present embodiment. 1 to 4, 1 is a tube, 2 is a nichrome wire, 3 is a heat resistant sheet, 4 is a slide cover, 5 is a slide shaft, 6 is a motor, 7 is a rotary head, 8 is a bearing, 9 is a bearing, 10 is a slidac, 11 is a power supply,
12 is a power supply brush, 13 is an insulating plate, 14 is a pillar, 15 is a cord,
20 is a spring, 21 is a drive shaft, 22 is an insulator, 24 is a rotating body, 26 is a receiving shaft, and 27 is a thrust bearing. The details will be described below.

In Fig. 1, a nichrome wire 2 having the same length as the tube 1
In advance, wrap the heat-resistant sheet 3 into the tube 1, insert it into the tube 1, insert one end of the nichrome wire 2 into the tip of the slide shaft 5 shown in detail in FIG. 3, tighten the screws 29a and 29b, and then attach the tube 1 to the tube 1. It is inserted at the tip of the slide shaft 5. In addition, the slide cover 5 made of a conductive material is provided around the slide shaft 5 so that an insulator disposed inside the slide cover 4 is provided.
A drive shaft 21 having a shaft end 22a attached thereto is connected to a motor 6. On the other hand, the tip of the non-driving side nichrome wire 2 is pulled out and inserted into the tip of the rotary head 7, and screws 29c and 29d are tightened to insert the tube 1 into the tip of the rotary head 7.

The rotary head 7 is made of a conductive material in a cylindrical shape, and the rotary body 24 is integrally assembled with the thrust bearing 27 inside the receiving shaft 26 with the bolt 28. An insulator 22b is fixed to the rear end of the receiving shaft 26 with a bolt 23b. Further insulation 22
It is rotatably assembled to the bearing 8 via the bearing 9 on the outer circumference of b. On the periphery of each of the slide cover 4 and the rotary head 7, the columns 14a and 14b shown in the enlarged view of FIG.
A power supply 11 for energizing the power supply brushes 12a, 12b to the nichrome wire 2 is connected to the insulators 13a, 13b fixed to the above by a cord 15 via a sliderac 10. In FIG. 2, the power supply brush 12a is fixed to the insulating plate 13a by bolts 16a and 16b so that the power supply brush 12a contacts the outer periphery of the slide cover 4.

In FIG. 3, the nichrome wire 2 wound with the heat-resistant sheet 3 and the tube 1 are attached to one end of the slide shaft 5 as described above, and the other end of the slide shaft 5 is axially grooved on the outer periphery and is coaxial. The spring 20 is abutted on the end face, and is fitted into the inner cylindrical portion of the drive shaft 21 so as to be slidably assembled in the groove of the slide shaft via the drive pin 19 in the drive shaft 21. Also, the slide shaft 5 is made of a conductive material, and the coaxial 5
Attach the slide cover 4 made of conductive material to the outer circumference of the
Mounted integrally with 17. Further, an insulator 22a is connected to one end of the drive shaft 21 with a bolt 23a in order to insulate it from other objects.

Similarly, in FIG. 4, the nichrome wire 2 wound with the heat-resistant sheet 3 and the tube 1 are attached to the rotary head 7 as described above.
A thrust bearing is provided in the rotary head 7 so that the rotary head 7 and the rotary body 24 can be integrally rotated by a round head screw 25.
26 is assembled.

The rotary head 7, the rotary body 24, and the receiving shaft 26 are all made of a conductive material. Further, an insulator 22b is connected to the end face of the other end of the receiving shaft 26 with a bolt 23b in order to insulate it from other objects.

When the surface of the ceramic tube 1 heated by the present apparatus having the above-described structure is subjected to the thermal spraying process, the powder as the thermal spraying material becomes high-speed melting particles by the plasma jet (not shown) and becomes fine when colliding with the surface of the ceramic tube 1. Since the thermal spray coating is formed and the ceramic tube is heated, the residual stress of the coating itself can be reduced.

[Effect of device]

As described above in detail, in the present invention, it is possible to select the proper temperature for preheating the tube in a stationary state and heating during rotation processing from the inside of the tube by adjusting the voltage. The residual stress of the sprayed coating itself can be reduced to improve the quality of the sprayed coating and improve the durability of the sprayed coating.

[Brief description of drawings]

FIG. 1 is a conceptual view showing the overall structure of a heating device for a rotary tube according to an embodiment of the present invention, FIG. 2 is a partial sectional view taken along the line II-II of FIG. 1 according to this embodiment, and FIG. FIG. 4 is a vertical cross-sectional view showing the drive-side shaft structure of the heating device according to this embodiment, and FIG. 4 is a vertical cross-sectional view showing the non-drive-side shaft structure of the heating device according to this embodiment. 1 ... Tube, 2 ... Nichrome wire, 3 ... Heat-resistant sheet, 4 ... Slide cover, 5 ... Slide shaft, 6 ...
Motor, 7 ... Rotating head, 8 ... Bearing, 9 ... Bearing, 10 ... Slidar, 11 ... Power supply, 12 ... Power supply brush, 13 ... Insulation plate, 14 ... Stand, 15 ... Cord, 16 ……
Screw, 17 ... Round head screw, 18 ... Groove, 19 ... Hole bolt,
20 ... Spring, 21 ... Drive shaft, 22 ... Insulator, 23 ...
… Bolt, 24 …… Rotator, 25 …… Screw, 26 …… Bearing shaft, 27
...... Thrust bearing, 28 …… Set screw, 29 …… Screw.

Claims (1)

[Scope of utility model registration request] 1. A device for surface-processing various tubes while rotating and heating the tubes, wherein rotating means connected to one end of the tubes via a drive shaft and the other end of the tubes are supported by bearings. Supporting means, a heating means provided inside the hollow portion of the tube and covered with a heat-resistant sheet, and an energizing portion energized from both ends of the heating means includes the drive shaft and the supporting means. An apparatus for heating a rotating tube, comprising: an insulated power feeding means.