JPH07100745A - Top guide of internal sliding device for pipe inner surface - Google Patents

Abstract

PURPOSE:To prevent the elevation/lowering disorder of a bearing box due to the heat generation and expansion through the revolution disorder and the seizure of an inner race contact part which are generated by the oil exhaustion of the bearing inner race of a top guide which supports a rod body having a rotary grinding wheel at the top end, and further to surely prevent the splash and outflow of grease. CONSTITUTION:A sleeve 21 which supports a rod body 5 in a revolutionarily slidable manner is supported by an automatic center adjusting bearing 22, and both the sides of the bearing 22 are covered by the eccentricity following type oil seals 37 and 39, and the bearing 22 is allowed to follow the gradient of the rod body 5, and also the oil seals 37 and 39 are allowed to follow the gradient.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a top guide for a center slide device on the inner surface of a pipe.

[0002]

2. Description of the Related Art A conventional inner slide device for the inner surface of a pipe is shown in FIG.
As shown in FIG. 1, a tube 1 formed of a centrifugally cast product using ductile cast iron is horizontally supported by a supporting roller 2 so as to be rotatable about an axis and rotationally driven by an appropriate mechanism to support the same. A bearing rail 6 is provided in which a traveling rail 3 is provided in the same direction as the pipe axis direction of the pipe 1, and a horizontal end of a rod body 5 is supported on a carriage 4 traveling on the traveling rail 3.
Is provided, and by rotating the rod body 5 by the motor 7 provided on the bearing device 6, the rotary grindstone 8 provided at the tip of the rod body 5 is rotationally driven, and the carriage 4 is moved toward the pipe 1. The rod body 5 is inserted into the inside of the pipe 1 by traveling, and the rotating grindstone 8 provided at the tip end of the rod body 5 is moved in the pipe axial direction by the traveling of the trolley 4 to grind the inner surface of the pipe 1 so as to perform a centering work. It is known to implement. At this time, a top guide 9 slidably supporting the tip side of the rod body 5 is provided at a fixed position between the carriage 4 and the pipe 1 to apply a grinding pressure to the rotary grindstone 8 at the tip of the rod body 5.

The top guide 9 has a structure as shown in FIG. 2, for example. In FIG. 2, the top guide 9 has a fixed frame 10, and inside the fixed frame 10, an elevating frame 12 is provided which is vertically movable along a guide rail 11 provided in the vertical direction. Is supported by the jack device 13. Further, in the elevating frame 12, a bearing box 15 accommodating a bearing 14 for rotatably and slidably supporting the rod body 5 is provided so as to be vertically movable. This bearing box 15 is a lifting frame 12
It is possible to descend by the jack device 16 installed inside, and the contraction operation of the jack device 16 causes the bearing box 15 to move.
Can descend by its own weight. At this time, a pressing force is applied to the inner surface of the pipe 1 by the rotary grindstone 8 at the tip of the rod body 5, and the inner grinding work of the inner surface of the pipe by the rotary grindstone 8 is performed.

[0004]

In the above structure, since the rod body 5 is bent by the load of the rotary grindstone 8, the rotary grindstone 8
In order to uniformly apply the side surface of the rod to the inner surface of the tube, the rod body 5 is used with its tip inclined in advance. However, since the bearing does not follow the rod gradient, one-sided contact with the inner ring of the bearing occurs, lubricating grease scatters and oil runs out due to outflow, and the bearing rotation resistance increases and heat is generated. In addition, the heat generated by the seizure also occurs at the contact area of the bearing inner ring, and the bearing housing expands, hindering the vertical movement.
The pressing force of the rotary grindstone 8 against the inner surface of the tube 1 may be affected, resulting in defective grinding.

The present invention is intended to solve the above problems, and has a bearing capable of following the rod gradient, and an eccentric follower type oil seal is provided to prevent scattering and outflow of lubricating grease. It is an object of the present invention to provide a top guide for an in-plane slide device.

[0006]

In order to solve the above problems, the top guide of the present invention has a sleeve for slidably supporting a rod body having a rotary grindstone at its tip, and an inner ring fitted to the sleeve. Self-aligning bearing, a bearing box body fitted to the outer ring of the self-aligning bearing, and interposed between the sleeve outer peripheral surface and the inner peripheral surface of the bearing box on both sides of the self-aligning bearing, An annular oil seal having concentric folds is provided in an intermediate portion.

[0007]

With the above structure, when the sleeve end is swung in the direction orthogonal to the axis due to the slant of the rod body, the inner ring of the self-aligning bearing performs the self-aligning operation with respect to the outer ring. It is possible to avoid one-sided contact of the bearing inner ring with the sleeve, and thus to prevent heat generation due to an increase in bearing rotation resistance due to oil shortage caused by the scattering and outflow of lubricating grease, and also because the contact portion of the bearing inner ring is seized. The heat generation is also eliminated, and the bearing box does not rise or fall due to the expansion due to the heat generation, and this does not affect the pipe inner surface grinding by the rotary grindstone. Further, since the oil seal follows the runout of the inner ring due to the self-aligning operation of the self-aligning bearing, it is possible to more reliably prevent the lubricating grease from scattering and flowing out.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a main portion of a top guide in a pipe inner surface slide device according to an embodiment of the present invention. In FIG. 1, 2
Reference numeral 1 denotes a sleeve that penetrates the rod body 5 and supports the rod body 5 so as to be rotatable and slidable. Reference numeral 22 denotes a self-aligning bearing, which includes an inner ring 24 that holds the roller 23 and an outer ring 26 whose surface that contacts the roller 23 forms a curved surface 25 for self-alignment. It is fitted so as to be in close contact with the outer peripheral surface. Reference numeral 27 denotes an inner ring pressing collar that presses the inner ring 24 of the self-aligning bearing 22 fitted on the outer peripheral surface of the sleeve 21, and is press-fitted from the other end side of the sleeve 21 to the outer peripheral surface of the sleeve 21, and the tip of the press-fitted side. Between the inner ring 2 of the self-aligning bearing 22 and the step portion 28 formed on one end side of the sleeve 21.
4 is pressed and clamped.

Reference numeral 29 denotes a bearing support member which is fitted onto the outer ring 26 of the self-aligning bearing 22 and holds the outer ring 26. The flange portion 30 projects inward from the end face toward the sleeve 21 on one end side.
And a step portion 31 formed thereby so as to be engaged with the outer ring 26 on the side of the self-aligning bearing 22. Further, the outer ring 2 is provided so as to communicate with the roller accommodating space of the self-aligning bearing 22.
A grease passage 33 that communicates with an oil hole 32 that is provided to penetrate 6 is provided. Reference numeral 34 is a lock member that is fitted into the bearing support member 29 from the other end side, and a flange portion 35 that protrudes inward from the end surface toward the inner ring holding collar 27 side fitted into the sleeve 21. The outer ring 26 of the self-aligning bearing 22 is pressed and sandwiched between the tip of the inner fitting side and the step portion 31 of the bearing support member 29, and is fixed to the other end of the bearing support member 29 by the bolt 36. To be done. The bearing support member 29 and the lock member 34 form a bearing box.

Reference numeral 37 denotes an annular oil seal which is housed in the space surrounded by the outer surface of the sleeve 21, the inner surface of the bearing support member 29, and the collar portion 30 and the self-aligning bearing 22. The outer peripheral surface of the sleeve 21 and the inner peripheral surface of the bearing support member 29 are in close contact with each other, and a fold portion 38 is concentrically formed in the middle portion thereof to prevent oil leakage from the self-aligning bearing 22 and It is possible to follow the runout in the direction orthogonal to the axis. Further, 39 is accommodated in the outer peripheral surface of the inner ring pressing collar 27 that is externally fitted to the sleeve 21, the inner peripheral surface of the lock member 34 that is internally fitted to the bearing support member 29, and the space surrounded by the collar portion 35 and the self-aligning bearing 22. Is an annular oil seal whose inner and outer peripheral edges are in close contact with the outer peripheral surface of the inner ring pressing collar 27 and the inner peripheral surface of the lock member 34, respectively, and, like the oil seal 37, have concentric folds in the middle portion. By having the portion 40, it is possible to prevent oil leakage from the self-aligning bearing 22 and to follow the runout of the sleeve 21 in the direction orthogonal to the axis. An outer frame 41 supports the bearing support member 29.

Next, the operation will be described. As already described, when the rod body 5 is used with the tip inclined in advance downward in order to uniformly apply the side surface of the rotary grindstone 8 to the pipe inner surface, the sleeve 21 swings slightly upward on the rod body 5 proximal end side. , The tip side of the rod 5 swings slightly downward,
The inner ring 24 of the self-aligning bearing 22 is self-aligned by the roller 23 sliding along the curved surface 25 of the outer ring 26 and avoids one-sided contact. Defects can be prevented. At the same time, the oil seals 37 and 39 can follow the deflection of the sleeve 21,
Oil leakage from the bearing can also be prevented.

[0012]

As described above, according to the present invention, it is possible to avoid uneven contact of the inner ring of the bearing with the sleeve, to prevent heat generation due to oil shortage due to scattering and outflow of lubricating grease, and contact of the inner ring of the bearing. There is no heat generation due to seizure of the portion, and the bearing box does not rise or fall due to expansion due to these heat generation, and does not affect the pipe inner surface grinding by the rotating grindstone. Furthermore, since the oil seal is an eccentric follow-up type, it is possible to more reliably prevent the lubricating grease from scattering and flowing out.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a top guide in a pipe inner surface slide device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main portion of a top guide in a conventional pipe inner surface slide device.

FIG. 3 is a schematic configuration diagram for explaining the entire inner slide device on the inner surface of the pipe.

[Explanation of symbols]

 21 sleeve 22 self-aligning bearing 23 roller 24 inner ring 26 outer ring 27 inner ring retainer collar 28 step portion 29 bearing support member 30 flange portion 31 step portion 34 locking member 35 collar portion 37, 39 oil seal 38, 40 fold portion

Claims (1)

[Claims] 1. A sleeve for slidably supporting a rod body having a rotary grindstone at its tip, a self-aligning bearing having an inner ring fitted to the sleeve, and an outer ring of the self-aligning bearing. A bearing box body, and an annular oil seal interposed between the outer peripheral surface of the sleeve and the inner peripheral surface of the bearing box body on both sides of the self-aligning bearing, and having an annular oil seal having a concentric fold portion at an intermediate portion. A top guide for a pipe inner surface slide device.