JPH075922Y2 - Chamfering equipment for existing piping - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention targets protection pipes for communication cables and power lines, and existing pipes such as water pipes and gas pipes, and removes burrs at their cutting ports. A chamfering device.

[Conventional technology]

When the existing pipe is cut, burrs appear on the inner edge of the cut. In the past, the removal of this flash has relied on manual work using an electric grinder or a rasp.

[Problems to be solved by the device]

In such chamfering work by human power, chamfering cannot be performed accurately, and work efficiency is poor. In particular, when chamfering pipes buried underground, the work space is narrow and it is impossible to force a posture. Since the pipe cutting performed prior to the chamfering work can be efficiently performed by the power cutter, the chamfering work is a factor that prolongs a series of works, and it is strongly desired to improve the efficiency.

In the case of protective piping where communication cables and power lines are buried, the cables are an obstacle and it is difficult to chamfer,
The cable may be damaged during chamfering, and the conventional type also has problems in these respects.

An object of the present invention is to solve the above-mentioned conventional problems and to obtain a power type chamfering device capable of performing chamfering work accurately and efficiently.

Another object of the present invention is to obtain a chamfering device that can chamfer a cable without damaging the cable even when the cable is passed through the pipe.

[Means for Solving the Problems]

The chamfering device of the present invention is a frame 1 which is externally fitted and attached to a pipe P.
And a drive mechanism 3 provided on the frame 1 for outputting external power as rotational power around the tube axis, and a chamfering blade unit 2 that receives rotational power of the drive mechanism 3 and is driven to rotate around the tube axis. ing.

Of these, the frame 1 includes a pair of holding blocks 5 and 6 that can be divided in the radial direction, and these holding blocks 5 and 6 can be detachably fastened with screws 8. The holding blocks 5 and 6 are provided with a clamp screw 9 for fixing the frame 1 to the pipe P.

The chamfering blade unit 2 is a cylindrical blade holder whose both ends are open.
21 and a chamfering blade 24 fixed to the outer surface of the blade holder 21. The blade holder 21 includes a pair of semi-cylindrical half-divided cylinders 25, 25, and these half-divided cylinders 25, 25 can be detachably fastened with a screw 26.

It has a plurality of slide shafts 28 attached to the final gear 17 of the drive mechanism 3 that outputs rotational power, and supports the blade holder 21 slidably in the tube axis direction by the slide shafts 28. The requirement is that a feed screw 30 for feeding the blade holder 21 toward the frame 1 is provided between the slide shaft 28 and the blade holder 21.

[Action]

By guiding the pair of holding blocks 5 and 6 constituting the frame 1 in a divided state to the outer circumference of the pipe P from the outside in the radial direction thereof and fastening both holding blocks 5 and 6 with the clamp screw 9, Assemble and mount the frame 1 on the outer periphery of P.

Next, the blade holder 21 is supported by the slide shaft 28, and then the feed screw 30 is operated to feed the chamfered blade 24 to the cutting opening of the pipe P under pressure. In this state, the blade holder 21 is rotationally driven via the drive mechanism 3.

As described above, the chamfering blade unit 2 rotates around the pipe axis, and the chamfering of the cutting opening of the pipe P is performed in the same manner as the cutting process.

Further, since the chamfering blade 24 is fixed to the cylindrical blade holder 21 with both ends open, and the chamfering is performed by rotating the blade holder 21 around the pipe axis, even if the cable is passed through the pipe, the cable It only makes sliding contact with the inner surface of the cylinder wall of the blade holder 21,
Moreover, since the chamfering can be performed with only a few rotations, the cable is not damaged.

〔Example〕

In FIG. 1, the chamfering device of the present invention includes a frame 1, a drive mechanism 3 provided on the frame 1 for outputting external power as rotational power around a tube axis, and driven by the drive mechanism 3 to rotate around the tube axis. And a chamfering blade unit 2 for cutting the inner edge of the cutting opening of the pipe P.

The frame 1 is composed of half-ring-shaped holding blocks 5 and 6 which are divided into two in the radial direction. Both blocks 5 and 6 are mounted on the outer periphery of the pipe P, and then the joining surfaces (division surfaces) 7 are joined to each other. Can be integrated by fastening with a screw 8. A total of three clamp screws 9 are screwed into the holding blocks 5 and 6 in order to fix the frame 1 to the pipe P in a free-moving manner.
Is equipped with.

The upper and lower holding blocks 5 and 6 are formed in a multi-stage half ring shape having different left and right outer diameters. In the figure, only the upper holding block 5 has a protruding portion 10. A gear chamber 11 is formed inside 10.

A holding groove 12 that partially communicates with the gear chamber 11 is formed in a circumferential shape on the left side surface of both holding blocks 5 and 6, and the drive mechanism 3 is incorporated from the gear chamber 11 to the holding groove 12. .

In FIGS. 1 and 2, the drive mechanism 3 receives rotational power from an external drive source via an input shaft 13 projecting outside the projection 10 of the frame 1, and this rotational power is transmitted to the worm shaft.
14, the worm gear 15, the drive spur gear 16, and the final stage gear 17 composed of a ring gear in this order to the chamfering blade unit 2.
Of these transmission members, the worm shaft 14 and worm gear
A gear support shaft 18, which is orthogonal to the drive spur gear 16 and the worm shaft 14, is incorporated in the gear chamber 11.

The final gear 17 is a pair of half-split gears that can be divided into upper and lower parts.
17a and 17a and half rings 17b and 17b, a groove 19 is formed between each half gear 17a and half ring 17b.
Is rotatably supported by holding blocks 5 and 6.

With the frame 1 assembled together, the final gear
The half gear 17a of the 17 is fitted in the holding groove 12, and the groove 19 is rotatably supported by the two holding blocks 5 and 6. Therefore, the final gear 17 is rotatably supported with respect to the frame 1 in a state in which it cannot be removed.

2 and 3, the chamfering blade unit 2 includes a cone-shaped blade holder 21 with both ends open, and a plurality of chamfering blades 24 fixed to the outer surface of the cylindrical wall 22 of the blade holder 21. Have.

The blade holder 21 is one in which a flange 23 is extended to the large-diameter opening edge of the cylindrical wall 22, and has a pair of half-split cylinders 25, 25 in which the cylindrical wall 22 and the flange 23 are radially divided into two. The half-split cylinders 25, 25 can be separably fastened with screws 26.

The cylindrical wall 22 also serves as a protective wall that prevents the chamfering blade 24 from coming into contact with the cable during chamfering. The chamfering blade 24 in the figure is made up of a total of four metal chips, and is half-embedded in the cylindrical wall 22 of the blade holder 21 and fixed with screws at equal intervals.

In order to transmit power to the blade holder 21 and also to support the blade holder 21 slidably in the tube axis direction, a total of two slide shafts, one at each outer end of the half ring 17b / 17b of the final gear 17, Install 28 and 28 in parallel with the pipe axis direction. The flange 23 of the blade holder 21 is provided with a slide hole 29 penetrating therethrough at a position corresponding to both slide shafts 28.

The blade holder 21 has the slide hole 29 inserted into the slide shaft 28 with the small diameter side of the cylindrical wall 22 facing the frame 1. In this inserted state, a feed screw 30 is provided between the slide shaft 28 and the blade holder 21 to feed the entire chamfering blade unit 2 toward the frame 1.

In FIG. 1, the feed screw 30 shown in the drawing is a wing nut,
This is screwed into a screw shaft 31 formed near the protruding end of the slide shaft 28, and feeds the blade holder 21 through the flange 23 to operate. Between the flange 23 and the final gear 17, the blade holder
A compression coil type spring 32 for pushing back 21 toward the feed screw 30 is interposed. When the feed screw 30 is screwed in against the spring 32, the chamfering blade 24 contacts the inner edge of the cutting opening of the pipe P.

Next, a description will be given of how to use the chamfering device of the present invention. In the state before assembly, the pair of holding blocks 5 and 6, the divided final stage gear 17, and the pair of half-split cylinders 25 and 25 are six pieces. It is divided into parts.

At the time of use, first of all, the half block 17a is attached to the lower holding block 6.
And the half ring 17b are integrated, and these are positioned below the pipe P. Next, the remaining half-split gear 17a side is joined to assemble the final stage gear 17, and the upper holding block 5 and the lower holding block 6 are joined in a state where the tooth surface is fitted in the holding groove 12. Then, these are integrated with the screw 8 and the frame 1 is assembled on the pipe P. After that, the frame 1 is moved in the pipe axis direction to position the slide shaft 28 in the axial direction,
The three clamp screws 9 are screwed in to fix the frame 1 to the pipe P.

Next, after inserting the spring 32 and the half-split cylinder 25 into the slide shafts 28, respectively, the half-split cylinders 25 are fastened together with the screws 26 and the blade holder.
Assemble 21. Furthermore, by screwing the feed screw 30 into the screw shaft 31 and screwing it against the spring 32, the chamfering blade
24 is pressed against the inner edge of the cut end of the pipe P. Also, input shaft 13
A flexible shaft is connected to the input shaft 13 and an external drive source. A hand drill, a small motor, or the like is used as the external drive source, and one end of the flexible shaft is connected to its output shaft.

When the external drive source is activated and the chamfering blade unit 2 is rotated several times after the above preparatory work is completed, the chamfering blade 24 bites into the inner edge of the opening of the pipe P to perform chamfering. As a result, the burr on the inner edge of the opening is completely cut off, but when chamfering with a wider width, the rotation of the blade holder 21 is temporarily stopped and the feed screw 30
After screwing in, the blade holder 21 is rotated and driven again.

[Another embodiment]

The cylindrical wall 22 of the blade holder 21 does not necessarily have to be a tapered wall, and may be formed of a cylindrical wall concentric with the pipe P.
In this case, the chamfering blade 24 is attached to the cylindrical wall 22 in an inclined posture.

The lead screw 30 need not be a wing nut. For example, a screw shaft may be provided between the blade holder 21 and the final stage gear 17 separately from the slide shaft 28, and the blade holder 21 can be fed and operated by this.

[Effect of device]

In the chamfering device of the present invention, the chamfering blade unit 2 is driven around the tube axis, and the chamfering blade 24 provided on the cylindrical wall 22 of the chamfering blade unit 2 can chamfer the cutting edge of the pipe P in the same manner as the machining. I chose Therefore, after the chamfering blade unit 2 is pressed against the opening edge of the pipe P,
Only by rotating the unit 2 several times, chamfering can be performed accurately and quickly, and labor saving and improvement of workability on site can be realized at the same time.

Since the chamfering blade 24 is fixed to the cylindrical blade holder 21 whose both ends are open, it is possible to prevent the chamfering blade 24 from coming into contact with the cable even when a communication cable or the like passes through the pipe P. At times, it is possible to reliably prevent the cable from being damaged by the chamfering blade 24.

[Brief description of drawings]

The drawings show an embodiment of the chamfering device according to the present invention. Fig. 1 is a vertical sectional front view, Fig. 2 is a sectional view taken along the line AA in Fig. 1, and Fig. 3 is B- in Fig. 1. It is a B line sectional view. 1 ... Frame, 2 ... Chamfering blade unit, 3 ... Drive mechanism, 5/6 ... Holding block, 8 ... Screw, 9 ... Clamp screw, 17 ... Final gear, 21 ... Blade Holder, 24 …… Chamfering blade, 25 …… Half-cylinder, 26 …… Screw, 28 …… Slide shaft,
30 ... Feed screw, P ... tube.

Continuation of the front page (72) Minor Takahashi Minor Kogyo Co., Ltd. 1-26-7, Uemachi, Chuo-ku, Osaka City, Osaka Prefecture (56) References 52-5587 (JP, U) 71892 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A frame (1) externally fitted to a pipe (P).
And a drive mechanism (3) provided on the frame (1) for outputting external power as rotational power around the tube axis, and a chamfer that is rotationally driven around the tube axis by receiving the rotational power of the drive mechanism (3). The blade unit (2) is provided, and the frame (1) includes a pair of holding blocks (5.6) that can be divided in the radial direction, and these holding blocks (5.6) are attached by screws (8). It can be fastened separably, and the frame (1) is piped (P) to the holding block (5, 6).
The chamfering blade unit (2) is equipped with a clamp screw (9) for fixing to a cylindrical blade holder (21) with both ends open, and a surface fixed to the outer surface of the blade holder (21). It consists of a blade (24) and the blade holder (21) includes a pair of semi-cylindrical halves (25, 25) that can be separated by screws (26). It has a plurality of slide shafts (28) that can be fastened and attached to the final gear (17) of the drive mechanism (3) that outputs rotational power. The slide shafts (28) move the blade holder (21) in the pipe axis direction. A feed screw (30) for slidably supporting the blade holder (21) toward the frame (1) side is provided between the slide shaft (28) and the blade holder (21). Chamfering device for existing piping.