JPH09271854A - Motor-operated enlarging tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a motor-operated tube enlarging tool of being able to machine even against a high strength steel tube. SOLUTION: In a motor-operated tube enlarging tool where a diameter enlarging member 39 to freely rotate on an axis being eccentric and inclined against a main shaft 34 rotated and driven with a motor 31 and to press and enlarge the inside face of tube end is installed, while the main shaft 34 is rotated, the diameter enlarging member 39 is pressed to the tube end inside diameter part of a tube 37 to be machined supported with a tube holder 35 and the tube end part is pressed and enlarged in a cone like, the tube holder 35 attaches a liner in a space of distance to the axial direction of the tube, and the tube 47 to be machined is supported surely through the liner.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electric pipe expanding tool. More specifically, the present invention relates to an electric pipe expanding tool used for pipe expanding work when a pipe end is expanded in a conical shape, fitted into a conical part of a pipe joint body, and fixed by a cap nut to connect the pipes.

[0002]

2. Description of the Related Art Conventionally, as one of the methods of connecting pipes, there is a method of using a pipe joint as shown in FIG.
As shown in the same figure, this is a joint body 2 having conical tips and threaded parts 1 and 1'having threads on the outer periphery on both sides, and cap nuts 3 and 3 screwed into the threaded parts. ’ Then, in order to connect the pipes 4 and 4 ', the ends of the pipes 4 and 4'are expanded into a conical shape, and the portions are tightened and fixed to the conical portions of the screw parts 1 and 1'by the cap nuts 3 and 3'. To do.

In this case, the ends of the tubes 4 and 4'must be expanded in a conical shape in advance. FIG. 9 shows a tool therefor. This is a rotary shaft 6 having a handle 5 at the upper end as shown in (a), a tool body 7 for rotatably supporting the shaft 6,
It is composed of holders 8 and 8'having holes 8a for fixing the pipe to be processed, and the rotating shaft 6 is provided with a conical diameter expanding member 9 which is eccentrically rotated as shown in FIG. . Then, the holders 8 and 8'holding the pipe 10 to be processed in the hole 8a are clamped and fixed to the tool main body 7 by the tightening handle 11, and the handle 5 is rotated to rotate the pipe 5 as shown in FIGS. Ten ends can be expanded. However, this tube expanding tool is manual and requires a large amount of force, which is inconvenient. For this reason, electric pipe expanding tools have been developed.

FIG. 10 is a sectional view showing this electric pipe expanding tool. This electric pipe expanding tool includes a motor 13 driven by a battery 12 and a gear reduction mechanism 14 driven by the motor 13.
And an annular boss 16 driven via the spline shaft 15
A main shaft 17 integrated with the annular boss 16 and a holder 19 for holding the pipe 18 to be processed. A feed screw is formed on the main shaft 17 and a cone similar to FIG. The diameter expanding member 20 is provided. And motor 1
When the main shaft 17 is rotated by 3, the main shaft 17 is moved forward by the feed screw and the conical diameter expanding member 20 is rotated to expand the end portion of the pipe 18 to be processed.

[0005]

In the conventional electric pipe expanding tool described above, since the pipe 18 to be processed is held at one point of the holder 19, the rigidity is low and the stainless steel pipe having high strength cannot be processed. Have difficulty. The present invention has been made in view of the above conventional problems, and an object of the present invention is to realize an electric pipe expanding tool capable of processing a stainless steel pipe.

[0006]

In the electric pipe expanding tool of the present invention, a main shaft 34 which is rotationally driven by a motor 31.
Is provided with a diameter-expanding member 39 that freely rotates on an eccentric and inclined shaft to push and expand the inner surface of the pipe end. In the electric pipe expanding tool for expanding the pipe end by pressing the diameter expanding member 39 to the pipe to expand the pipe end in a conical shape, the pipe holder portion 35 is provided with a distance in the axial direction of the pipe.
8, 49 are mounted, and the pipe 47 to be processed is supported and fixed through the liners 48, 49.

In addition to the above, the tube holder portion 3
5, the liner 48 mounted on No. 5 is provided with a pipe end positioning means whose side portion comes into contact with the pipe end surface when the pipe 47 to be processed is mounted and which is movable in the normal direction during pipe expansion.

Further, means for resetting the pipe end positioning means to the initial state is provided in the pipe holder portion 35, and when the upper pipe holder 43 of the pipe holder portion 35 is opened from the lower pipe holder 44, It is characterized in that the positioning means is automatically reset.

Further, instead of the rear liner 49 mounted on the pipe holder 35, a stepped support 61 for supporting the rear part of the pipe 47 to be processed and a screw mechanism 62 for pressing the rear part of the stepped support 61. It is characterized in that the short tube holder 60 made of is provided in the tube holder portion 35.

The tube end expanding member 39 has a ball bearing 7 fixed so as to rotatably support the expanding member 39.
It is characterized in that it can be attached to and detached from the main shaft 34 together with 2, 73 and 74.

By adopting this structure, it is possible to obtain an electric pipe expanding tool which can machine even a stainless steel pipe having high strength.

[0012]

1 is a sectional view showing an outline of an embodiment of the present invention. In the embodiment of the present invention, as shown in the figure, a case 30 and a main shaft 3 driven by a motor 31 via a gear reduction mechanism 32 and a spline shaft 33.
4 and a pipe holder portion 35 for supporting and fixing the pipe to be processed. The main shaft 34 is provided with an annular boss 38 formed with a feed screw 37 that is screwed into a housing 36 fixed to the case 30, and a pipe expanding portion 40 having an eccentric and inclined rotatable conical diameter expanding member 39. ing. The annular boss 38 is slidable on the spindle 34 and
Rotation is transmitted by the ratchet 41 provided on the No. 4,
Further, a disc spring 42 is inserted between the expanded tube portion 40.

The tube holder portion 35 is composed of the upper tube holder 4
3 and the lower tube holder 44 are separated by a hinge pin,
The lower pipe holder 44 is formed by the case 30, and the upper pipe holder 43 is connected to the lower pipe holder 4 by a hinge pin.
4, one end of the clamp screw 4 can be opened upward and the clamp screw 4 of the clamp 45 (see FIG. 4) can be opened.
It is designed to be pressed and fixed to the lower tube holder 44 by 6. Also, replaceable liners 48 and 49 having inner diameters corresponding to the pipe 47 to be processed are mounted on the upper and lower pipe holders 43 and 44, respectively, at intervals in the axial direction of the pipe. Then, by driving the motor 31, the main shaft 34 is rotated forward and the conical diameter expanding member 39 is moved to the pipe holder portion 3.
5 is pressed against the inner surface of the pipe 47 to be processed and expanded.

FIG. 2 is a view showing the pipe support means of the present embodiment. In the figure, 35 is a tube holder part, 43 is an upper tube holder, and 44 is a lower tube holder. The upper and lower pipe holders 43 and 44 are provided with liners 48 and 49, which are divided into upper and lower semi-cylindrical shapes, respectively at two front and rear positions. That is, front liners 48a and 48b are attached to the front of the tube holder 35, and rear liners 49a and 49b are attached to the rear thereof. The inner diameters of these liners 48a, 48b, 49a, 49b are equal to the outer diameter of the target pipe to be processed, and the front liners 48a, 48b are formed with cone receiving portions 50 for expanding the pipe 47 to be processed. . Also, the split surface is the tube holder 4.
Fitting concave and convex portions for circumferential positioning are provided between the pipe holders 43 and 44 so as to match with the pipe holders 3 and 44.

Since the processed pipe supporting means of the present embodiment configured as described above can support and fix the processed pipe 47 at two positions in front and rear with a distance in the axial direction of the pipe, the supporting rigidity is large. The parallelism of the tube axis does not change. Therefore, even a stainless steel pipe having high strength can be properly and surely held and expanded.

FIG. 3 is a view showing a pipe end positioning means according to the embodiment of the present invention. As shown in the figure, the pipe end positioning means is provided with a through hole 51 in the front liner 48 in a normal direction from a predetermined position on the outer periphery thereof to a midpoint of the cone receiving portion 50. A pin 52 for positioning the pipe end is slidably provided at 51. As shown in FIG. 3B, the tip of the pipe end positioning pin 52 has an inclined surface in accordance with the inclination of the conical receiving portion 50 for pipe expansion. A flat portion 53 is formed in the middle of the pipe end positioning pin 52, and one end thereof is pressed by a pin 55 biased by a spring 54 to prevent free movement due to friction.

The front liner 48 of the present embodiment having the above-mentioned structure fixes the pipe end positioning pin 52 by abutting the tip of the pipe 47 to be processed as shown in FIG. 3B. Then, as shown in FIG. 3C, the main shaft is rotated to rotate the conical diameter expansion member 3
By rotating and advancing 9 the pipe end of the pipe 47 to be processed can be expanded. In this case, since the pipe end positioning pin 52 is pushed by the conical diameter expanding member 39 and retracts as the pipe expands, it does not hinder the pipe expanding operation of the conical diameter expanding member 39.

FIG. 4 is a diagram showing the reset means of this embodiment. In the figure, 44 is a lower tube holder holding the lower half of the front liner 48, and 43 is the front liner 4.
8 is an upper tube holder 43 which holds the upper half and is hinged to the lower tube holder 44 by hinge pins 56. A reset plate 57 is attached by bolts 58 near the hinge of the upper tube holder 43. A disc spring or a coil spring 59 is inserted between the reset plate 57 and the head of the bolt 58 so that it can be slightly swung. In addition, the reset plate 57
The length of the lower liner 48b when the upper pipe holder 43 is opened from the lower pipe holder 44 as shown by the chain double-dashed line.
The length is such that it can be reset by pressing it by abutting against the pipe end positioning pin 52 provided on the.

The reset means of the present embodiment having the above-mentioned structure, as shown in FIG. 3 (c), when the expansion of the pipe to be processed is completed, the upper pipe holder 4 is used to take out the pipe.
When 3 is released from the lower pipe holder 44 as shown in FIG. 4, the pipe end positioning pin 52 is pressed by the reset plate 57 as shown by the chain double-dashed line, and the pin 52 is pushed as shown in FIG. 3 (b). It projects from the liner 48 and is automatically reset to the initial state before mounting the pipe.

FIG. 5A shows a short tube holder 6 of this embodiment.
FIG. The short pipe holder 60 is used when forming the expanded diameter portions at both ends of the short pipe. In the figure, reference numeral 35 denotes a pipe holder part, and a front liner 48 and a rear liner 49 are mounted on the pipe holder part 35, and the rear liner mounting part is provided with a short pipe of the present embodiment. The holder 60 is attached. The short pipe holder 60 includes a stepped support 61 having a substantially conical shape for supporting the inner surface and end of the rear part of the pipe to be processed, and a screw mechanism 6 for pressing the rear part of the stepped support 61.
And 2.

The stepped support 61 is formed in a plurality of steps of substantially conical shape having different outer diameters so that the inner surfaces and ends of a plurality of types of pipes having different inner diameters can be pressed and held, and a mounting hole is formed at the center thereof. 63 is provided, and a guiding cylindrical portion 64 is provided at the rear portion. FIG. 5B shows a stepped support for a pipe having a smaller diameter than that shown in FIG. 5A, which is replaceable with the stepped support for the large diameter.

Further, the pressing screw mechanism 62 has a disc 66 having one end side flange portion attached to the ring fitted to the rear liner mounting portion and the other end having a screw hole 65 formed therein, and the stepped support member. It comprises a cylinder 67 for guiding 61, and a screw shaft 69 screwed into the screw hole 65 and having one end rotatably engaged with the stepped support 61 and the other end having a knob 68. The cylinder 67 is provided with a slit groove from the one end brim side to the middle, and when the upper pipe holder 43 of the pipe holder portion 35 is clamped as shown in FIG. Body 6
The supporting rigidity of No. 1 is increased.

The present embodiment configured as described above is shown in FIG.
As described above, the short pipe holder 60 in which the front portion of the pipe 47 to be processed is supported by the front liner 48 and the rear portion is attached to the pipe holder portion 35.
The stepped support 61 can press and support the rear portion of the short tube 47 to perform the tube expanding operation. At this time, when expanding both ends of the pipe to be processed 47, two cap nuts 70 of the pipe joint are previously prepared.
It is necessary to insert 71. Therefore, the minimum length of the pipe 47 to be processed is the sum of the thickness of the front liner 48 and the thickness of the two cap nuts 70 and 71.

FIG. 7 is a view showing the conical diameter expanding member replacing means of the present embodiment. Since the conical expanding member replacement means is suitable for various pipes having different inner diameters, a plurality of conical expanding members 39 having different sizes can be replaced as shown in the drawing. Ball bearings 72, 73, 74 are press-fitted and fixed to the shaft portion of 39. The ball bearings 72, 73, 74 are loosely fitted to the main shaft 34.

In the conical expanding member replacement means thus constructed, the conical expanding member 39 is provided with ball bearings 72, 73, 7
4 is fixed, and the ball bearings 72, 73, 74 are loosely fitted to the main shaft, so that the conical expanding member 39 is replaced integrally with the ball bearings 72, 73, 74. , Its replacement is extremely easy, so the ball bearing 72,
It is possible to prevent dust from entering the 73 and 74.

[0026]

According to the present invention, since the pipe to be processed is supported and fixed at a distance in the axial direction of the pipe, the supporting rigidity is high,
Therefore, even a high strength stainless steel pipe can be expanded. Further, by providing the pipe end positioning pin and the resetting means thereof, the pipe end can be easily positioned. Further, since the conical diameter expanding member for expanding the pipe can be attached to and detached from the main shaft together with the bearing, the bearing can be easily replaced without being contaminated.

[Brief description of drawings]

FIG. 1 is a sectional view showing an outline of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a processed pipe support means according to an embodiment of the present invention.

3A and 3B are diagrams showing a pipe end positioning means according to an embodiment of the present invention, in which FIG. 3A is a diagram showing its configuration, and FIGS. 3B and 3C are diagrams illustrating its operation.

FIG. 4 is a diagram showing reset means according to the embodiment of the present invention.

5A and 5B are views showing a short pipe supporting means of an embodiment of the present invention, FIG. 5A is a sectional view, and FIG. 5B is a sectional view showing a stepped support for a small diameter pipe.

FIG. 6 is a cross-sectional view showing a usage state of the short tube supporting means according to the embodiment of the present invention.

FIG. 7 is a diagram showing a conical diameter expanding member of the conical diameter expanding member replacing means according to the embodiment of the present invention.

FIG. 8 is a diagram for explaining an example of a conventional pipe connection method.

FIG. 9 is a view showing a conventional manual pipe expanding tool.

FIG. 10 is a view showing a conventional electric pipe expanding tool.

[Explanation of symbols]

 30 ... Case 31 ... Motor 32 ... Gear reduction mechanism 33 ... Spline shaft 34 ... Main shaft 35 ... Pipe holder part 36 ... Housing 37 ... Feed screw 38 ... Annular boss 39 ... Expanding member 40 ... Expanding part 41 ... Ratchet 42 ... Disc spring 43 ... Upper pipe holder 44 ... Lower pipe holder 45 ... Clamp 46 ... Clamp screw 47 ... Work pipe 48 ... Front liner 49 ... Rear liner 50 ... Cone receiving part 51 ... Through hole 52 ... Pipe end positioning pin 53 ... Flat Part 54 ... Spring 55 ... Pin 56 ... Hinge pin 57 ... Reset plate 58 ... Bolt 59 ... Disc spring or coil spring 60 ... Short tube holder 61 ... Stepped support 62 ... Press screw mechanism 63 ... Mounting holes 64, 65 ... Bag Nut 66 ... Disc 67 ... Cylinder 68 ... Knob 69 ... Screw shaft 70, 71 ... Cap nut 72, 73, 74 ... Ball bearing

Claims (5)

[Claims] 1. A diameter-expanding member that freely rotates on a shaft that is eccentric and inclined with respect to a main shaft that is rotationally driven by a motor to expand the inner surface of the pipe end, and is supported by a pipe holder while rotating the main shaft. In an electric pipe expanding tool that expands the pipe end by conically expanding the pipe end by pressing the expansion member against the inner diameter of the pipe end, the pipe holder part is equipped with a liner at a distance in the axial direction of the pipe. An electric pipe expanding tool is characterized in that the pipe to be processed is supported and fixed through the liner. 2. A liner attached to the pipe holder portion is provided with a pipe end positioning means whose side portion comes into contact with the pipe end surface when the pipe to be processed is attached and which is movable in the normal direction when expanding the pipe. The electric pipe expanding tool according to claim 1. 3. A means for resetting the pipe end positioning means to an initial state is provided in a pipe holder part, and the pipe end positioning means is reset when the upper pipe holder of the pipe holder part is opened from the lower pipe holder. The electric pipe expanding tool according to claim 2, wherein the operation is automatically performed. 4. A short pipe holder comprising a stepped support member that supports the rear portion of the pipe to be processed, and a screw mechanism that presses the rear portion of the stepped support member, instead of the rear liner attached to the pipe holder portion. The electric pipe expanding tool according to claim 1, wherein a tool is provided on the pipe holder portion. 5. The pipe end expanding member can be attached to and detached from a main shaft together with a ball bearing fixed so as to rotatably support the expanding member, and can be replaced. Electric pipe expanding tool.