JP6436327B1 - Pipe end processing equipment - Google Patents

Abstract

The present invention provides a pipe end processing apparatus that reduces the frictional force at the time of processing and improves the degree of freedom of the folding angle of the pipe end.
A pipe end processing apparatus 200 includes: a rotation drive source 12 that rotates a shaft 11; a slide base 21 that rotates according to rotation of the shaft 1) and that can slide along the shaft axis of the shaft 11. The slide base drive unit 14X that converts the rotational motion of the shaft 11 into a linear motion to drive the slide base 21 and a roller that is provided at the tip of the slide base 21 and is rotatably supported by the roller support shaft 20b. 20. Then, the slide drive of the slide base 21 presses the roller 20 against the inner surface of the tube end to fold the tube end 1a outward in the tube radial direction.
[Selection] Figure 3

Description

  The present invention relates to a pipe end processing apparatus that performs a pipe end folding process.

  Conventionally, in order to prevent the heat transfer tube from falling off and to obtain a connection structure between pipes, a process of turning the tip portion outward in the pipe radial direction has been performed.

  As an apparatus for performing such a process, Patent Document 1 discloses a taper portion at the tip of the heat transfer tube exposed from the tube hole of the tube plate in order to prevent the heat transfer tube from falling off the tube plate. There is described a heat transfer tube expansion device in which a bell mouth process is performed in which a tube expansion jig is pressed and the tip of the heat transfer tube is folded outward in the tube diameter direction.

  Further, Patent Document 1 discloses a shape memory in which a roller is rotated outward in the tube radial direction so that the tip of the heat transfer tube exposed from the tube hole of the tube plate is turned back outward in the tube radial direction by the rotation drive of the mandrill. A tube expansion device for a heat transfer tube provided with an alloy expanded member is described.

Japanese Utility Model Publication No. 6-66828

  However, in the apparatus provided with the tube expansion jig having the tapered portion described in Patent Document 1, there is a problem that there is no degree of freedom in the folding angle of the tube end.

  In addition, in the apparatus provided with the shape memory alloy diameter-expanding member that rotates the roller described in Patent Document 1 outward in the tube diameter direction, the degree of flexibility of the tube end folding angle is somewhat, but the folding angle is set to the tube. It is difficult to make it perpendicular (90 °) with respect to the axis, or to process at an angle larger than that.

In view of the above-described problems, a pipe end processing device according to the present invention includes a shaft (11) having a polygonal cross section,
A rotational drive source (12) that rotationally drives the shaft (11), a slide base (21) that rotates according to the rotation of the shaft (11) and that can slide along the shaft axis of the shaft (11), and a shaft A slide base drive unit (14X) that converts the rotational motion of (11) into a linear motion to drive the slide base (21) and a tip of the slide base (21), and is provided by a roller support shaft (20a). A roller (20) rotatably supported, and the slide base (12) has a through hole having the same shape as the cross section of the shaft (11), and the shaft (11) is inserted into the through hole. The slide base drive unit (14X) includes a male screw part (21a) engraved on the outer peripheral surface of the slide base (21) and a gas screw provided with a female screw part (15a). And a male screw part (21a) and a female screw part (15a), and the slide base (21) is slid according to the rotational drive of the shaft (11). By sliding the slide base (21), the roller (20) is pressed against the inner surface of the tube end to fold the tube end (1a) of the tube (1) outward in the tube radial direction.

  According to the present invention, since the roller (20) is pressed against the inner surface of the pipe end and the pipe end (1a) is turned back outward in the pipe radial direction, the frictional force during the processing can be reduced. Further, since the roller (20) is pressed against the inner surface of the pipe end by the slide drive of the slide base (21), the pipe end (1a) is folded outward in the pipe radial direction, so that the folding angle of the pipe end (1a) can be freely set. For example, the folding angle can be vertical (90 °) with respect to the tube axis, or the angle can be further increased.

  Further, the slide drive of the slide base (21) is performed by converting the rotational motion of the shaft (11) into a linear motion using the rotational drive source (12) that rotationally drives the shaft (11). The rotation drive of the shaft (11) and the slide drive of the slide base (21) can be performed by a single drive source.

  According to the present invention, in addition to being able to reduce the frictional force at the time of processing, the degree of freedom of the folding angle of the pipe end is improved, for example, the folding angle is made perpendicular (90 °) to the pipe axis. It can be processed to an angle larger than that.

  Further, the rotation drive of the shaft and the slide drive of the slide base can be performed by a single drive source.

  Furthermore, the present invention is to form a pipe connection structure in which the pipe ends of two pipes are folded back perpendicularly outward in the pipe radial direction, flange parts are formed respectively, and the two flange parts are faced and fastened. Is preferred.

It is sectional drawing which looked at the pipe end pre-processing apparatus in embodiment of this invention from the front. It is a side view of a pipe end pre-processing apparatus. It is sectional drawing which looked at the pipe end processing apparatus in embodiment of this invention from the front. It is a side view of a pipe end pre-processing apparatus. It is a figure which shows the state which turned up the pipe end.

  Next, the pipe end processing apparatus 100 according to the embodiment of the present invention will be described with reference to FIGS.

<Configuration of pipe end preliminary processing apparatus 100>
In order to improve the flexibility of the folding angle of the tube end 1a of the tube 1, first, the tube end is folded to some extent using the tube end pre-processing device 100, and then the tube end folding angle is used using the tube end processing device 200. Is further increased.
Therefore, the configuration of the pipe end preliminary processing apparatus 100 that performs such preliminary processing will be described with reference to FIGS. 1 and 2.

  The tube 1 as a workpiece is chucked by a chuck member 2, and the tube end 1 a is exposed from the chuck member 2.

  The shaft 11 is coupled to a drive shaft of a rotary drive source 12 such as a motor and is driven to rotate about the shaft axis of the shaft 11. The shaft 11 has a polygonal cross section (for example, a quadrangle). The slide base 13 has a through hole having the same shape as the shaft cross section, and the shaft 11 is inserted into the through hole. For this reason, the slide base 13 rotates along with the rotation of the shaft 11 and can slide along the axis of the shaft 11.

  The slide base drive unit 14 converts the rotational motion of the shaft 11 into a linear motion, and drives the slide base 13 to slide. The slide base drive unit 14 includes a male screw portion 13a engraved on the outer peripheral surface of the slide base 13, and a guide member 15 engraved with a female screw portion 15a. The male screw portion 13a and the female screw portion. The slide base 13 is configured to slide in response to the rotational drive of the shaft 11. In this case, the outer periphery of the slide base 13 is a cylindrical surface, the guide member 15 is a cylindrical body, and a female screw portion 15a is engraved on the inner peripheral surface thereof.

A conical tapered portion 13 b is provided at the tip of the slide base 13.
Then, by sliding the slide base 13, the tapered portion 13b is pressed against the inner surface of the pipe end so that the pipe end 1a is folded outward in the pipe radial direction.

  Next, the operation of the pipe end preliminary processing apparatus 100 will be described with reference to FIG. First, in the initial state of FIG. 1A, the tube 1 is chucked by the chuck member 2, and the shaft 13 is inserted into the tube 1. At this time, the tube end 1 a is exposed from the chuck member 2.

  Next, as shown in FIG. 1B, when the rotation drive source 12 is turned on and the shaft 11 is rotationally driven, the slide base 13 slides forward while rotating. Then, by pressing the tapered portion 13b against the inner surface of the tube end, the tube end 1a is folded outward to the taper angle of the tapered portion 13b. When the preliminary machining is completed in this way, the shaft 11 is reversely rotated by turning the rotation drive source 12 to the reverse rotation on state. As a result, the slide base 13 slides backward and returns to the initial position.

<Configuration of pipe end processing apparatus 200>
Next, the structure of the pipe end processing apparatus 200 will be described with reference to FIGS. The tube end processing device 200 is configured by replacing the slide base 13 in the tube end preprocessing device 100 with another slide base 21 provided with a roller 20. Other configurations are the same as those of the tube end preliminary processing apparatus 100. Instead of replacing the slide base 13, a slide base 21 having a roller 20 may be attached to the tip of the slide base 13.

  The slide base drive unit 14X converts the rotational motion of the shaft 11 into a linear motion and drives the slide base 21 to slide. The slide base drive unit 14X includes a male screw part 21a engraved on the outer peripheral surface of the slide base 21, and a guide member 15 engraved with a female screw part 15a. The male screw part 21a and the female screw part The slide base 21 is configured to slide in response to the rotational drive of the shaft 11. In this case, the outer periphery of the slide base 21 is a cylindrical surface, the guide member 15 is a cylindrical body, and a female screw portion 15a is engraved on the inner peripheral surface thereof.

  A roller 20 is provided at the tip of the slide base 21, and is rotatably supported by a roller support shaft 20a. The roller 20 has a conical tapered surface. The slide base 21 has a slide portion 21b engaged with the shaft 11 and a screwing portion 21c screwed with the guide member 15. The roller support shaft 20a is disposed between the slide portion 21b and the screwing portion 21c. It is stretched diagonally.

The slide base 21 is driven to slide so that the roller 20 is pressed against the pre-processed inner surface of the tube end, and the tube end 1a is folded outward in the tube radial direction.
The roller 20 and the roller support shaft 20a may be one set or two sets, but in order to bend the tube end 1a uniformly in the circumferential direction, as shown in FIG. It may be provided.

  Next, operation | movement of the pipe end processing apparatus 200 is demonstrated based on FIG. First, in the initial state of FIG. 3A, the pre-processed tube 1 is chucked by the chuck member 2, and the tube end 1 a that is folded to some extent by the pre-processing is exposed from the chuck member 2.

Next, as shown in FIG. 3B, when the rotation drive source 12 is turned on and the shaft 11 is driven to rotate, the slide base 21 slides forward while rotating.
Then, the roller 20 is pressed against the preliminarily processed inner surface of the tube end to fold the tube end 1a outward in the tube radial direction.

  In this case, the folding angle of the tube end 1a is determined by the inclination angle of the roller 20 with respect to the tube axis of the tube 1. Since the tube end side tip surface 2 a of the chuck member 2 serves as a locking surface of the tube end 1 a, the inclination angle with respect to the tube axis is matched with the inclination angle of the roller 20.

  When the tube end processing is completed in this way, the shaft 11 is rotated in reverse by turning the rotation drive source 12 in the reverse rotation on state. As a result, the slide base 21 slides backward and returns to the initial position.

  Thus, according to the pipe end processing apparatus 200, the pipe end 1a is turned back by pressing the roller 20, so that the frictional force at the time of processing can be reduced, and the turn back angle of the pipe end 1a can be freely set. For example, the folding angle can be vertical (90 °) with respect to the tube axis, or the angle can be further increased. Further, the rotation drive of the shaft 11 and the slide drive of the slide base 21 can be performed by a single drive source.

  The pipe end preliminary processing apparatus 100 and the pipe end processing apparatus 200 fold the pipe ends 1a of the two pipes 1 outward in the radial direction of the pipe and perpendicularly to the pipe axis to form flange portions respectively. It is suitable for forming a pipe connection structure that is fastened with the flange portions facing each other.

  The tube end 1a folding process in this case will be described with reference to FIG. FIG. 5A shows a state in which the tube end 1a is folded back by the roller 20, and FIG. 5B shows a state in which the folding is completed and the roller 20 is moved backward from the tube end 1a.

  The folded tube end 1a (flange portion) tends to be restored by elastic force. Therefore, as shown in FIG. 5 (a), it is folded back at an angle slightly larger than the vertical in consideration of restoration by elastic force.

  Further, the inclination angle of the tube end side distal end surface 2a of the chuck member 2 with respect to the tube axis is made larger than the vertical in accordance with the turning angle of the tube end 1a. When the folding of the tube end 1a is completed and the pressing force of the roller 20 is released, the folding angle of the tube end 1a becomes vertical as shown in FIG.

DESCRIPTION OF SYMBOLS 1 Tube 1a Tube end 2 Chuck member 11 Shaft 12 Rotation drive source 13 Slide base 13a Male screw part 13b Taper part 14, 14X Slide base drive part 15 Guide member 15a Female screw part 20 Roller 20a Roller spindle 21 Slide base 21a Male screw Part 21b slide part 21c screwing part

Claims (2)

A shaft (11) having a polygonal cross section;
A rotational drive source (12) for rotationally driving the shaft (11);
A slide base (21) that rotates according to the rotation of the shaft (11) and is slidable along the shaft axis of the shaft (11);
A slide base drive unit (14X) for converting the rotary motion of the shaft (11) into a linear motion to drive the slide base (21) to slide;
A roller (20) provided at the tip of the slide base (21) and rotatably supported by a roller support shaft (20a);
The slide base (12) has a through hole having the same shape as the cross section of the shaft (11), and the shaft (11) is inserted into the through hole,
The slide base drive unit (14X) includes a male screw part (21a) engraved on the outer peripheral surface of the slide base (21), and a guide member (15) engraved with a female screw part (15a). The male screw portion (21a) and the female screw portion (15a) are coupled, and the slide base (21) is slid according to the rotational drive of the shaft (11),
Pipe end machining characterized in that the slide end of the pipe (1) is folded outwardly in the pipe radial direction by pressing the roller (20) against the pipe end inner surface by sliding the slide base (21). apparatus. The slide base (21) has a slide part (21b) engaged with the shaft (11) and a screwing part (21c) screwed with the guide member (15). The shaft (20a) is slanted between the slide part (21b) and the screwing part (21c), and the end surface (2a) of the pipe end side of the chuck member (2) that chucks the pipe (1). The pipe end processing apparatus according to claim 1 , wherein an inclination angle with respect to the pipe axis is matched with an inclination angle of the roller (20) .

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