JP2959816B2 - PTFE liner tube end opening device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a polytetrafluoroethylene resin (hereinafter, “PTFE”) lined in a flanged metal pipe such as a straight pipe, an L-shaped pipe, a T-shaped pipe and the like. The present invention relates to a PTFE liner tube end expanding device capable of expanding an end of a liner tube made of PTFE along a flange surface.

Technical background of the invention PTFE has excellent properties in heat resistance, chemical resistance and non-adhesion compared to other synthetic resins, but its processing method is close to powder metallurgy, It is difficult to process by the processing method used for the above-mentioned hot-melt synthetic resin, and it is necessary to use special processing means.

For example, when lining PTFE on a metal tube with a flange, firstly insert a sleeve into the metal tube to be lined, and mold these metal tube and sleeve with a mold,
PTFE powder is pre-pressed in these molds and then PTFE
Baking at a temperature equal to or higher than the melting point (about 327 ° C.) The liner tube after firing is the fifth,
As shown in FIG. 6, it protrudes from the metal flange surface by a predetermined length, and this protruding portion is expanded along the flange surface. Alternatively, make a PTFE liner tube in another mold in advance, insert it into a metal tube,
The tube end projecting from the flange surface may be expanded along the flange surface.

The operation of expanding the end of the liner tube inserted into the metal tube along the flange surface is conventionally performed as follows.

Fix the metal tube into which the PTFE liner tube has been inserted by some means so that the end of the PTFE liner tube protrudes from the flange surface by a predetermined length, and attach the heated conical flare to the end surface of the liner tube. The jig is pressed to expand the end of the tube along the flare jig, and a first-stage expansion process is performed. Since it is difficult to expand the end of the liner tube by approximately 90 degrees in one expanding step, the expanding step uses a plurality of flare jigs with different top angles to gradually remove the end of the liner tube. It is performed by expanding. In the final expansion process, a convex cooling flare jig matching the shape of the flange surface of the metal pipe is used, and this is pressed against the end of the liner tube, so that the tube end is finally moved along the flange surface. Expands approximately 90 degrees.

However, the conventional flare jigs used in such a conventional end opening process are individually managed, and the control of the heating temperature or the pressing force of each flare jig is performed by an operator. It has a disadvantage that workability is poor because it is dependent and not systematized.

In addition, it is difficult to center (align the shaft) between each flare jig and the liner tube during the expanding process.
Skill is required, and the workability is also poor in this respect.

Object of the Invention The present invention is made to solve the disadvantages of the prior art described above, it is easy to systematize the temperature control or pressing force control of each flare jig required for a series of expanding process, Moreover, it is an object of the present invention to provide a PTFE liner end opening device that can easily center each flare jig and the liner tube and can manage each flare jig collectively.

SUMMARY OF THE INVENTION In order to achieve such an object, a PTFE according to the present invention is used.
The liner tube end expansion device is a PTFE liner tube end expansion device that can expand the end of a polytetrafluoroethylene resin liner tube lined inside a flanged metal tube along the flange surface. In the opening device, tube holding means for holding the vicinity of the flange of the metal tube into which the liner tube is inserted so that the end of the liner tube protrudes from the flange of the metal tube, and an end of the liner tube. A plurality of flare jigs are sequentially pressed against each other to gradually expand the end of the liner tube along the flange surface, and these flare jigs are held movably in the axial direction. The position of the axis is substantially coincident with the axis of the liner tube inserted into the metal tube held by the tube holding means. A jig holding plate which is rotatably mounted so that the rear end of the flare jig is pressed when the axis of one of the flare jigs substantially coincides with the axis of the liner tube. Jig pressing means for pressing the flare jig against the end of the liner tube.

According to such a PTFE liner tube end expanding device according to the present invention, a plurality of flare jigs required for a series of expanding processes are collectively mounted on a jig holding plate. It is possible to manage tools collectively.

In order to perform the expansion, the jig holding plate is rotated so that the axis of the flare jig used for the expansion process at each stage is
The axis of the liner tube end in the metal tube held by the tube holding means is made substantially coincident with the axis, and the rear end of the jig is pressed by the jig pressing means. At this time, since the jig holding plate on which the flare jig is mounted is rotatably mounted, when the tip of the flare jig is inserted into the end of the liner tube,
When the jig holding plate is slightly rotated, the axes of the two are almost completely coincident. Therefore, the axis alignment work is also easy.

It is also possible to provide individual heating means or cooling means for each flare jig and control these temperatures collectively. Further, the pressing force of the jig pressing means can be controlled collectively.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a schematic front view of a PTFE liner tube end expanding device according to an embodiment of the present invention, FIG. 2 is a plan view of the expanding device, and FIG. 3 is a flare jig shown in FIG. III-III
FIG. 4 is a schematic arrow view along the line, FIG. 4 is a schematic arrow view along the IV-IV line of the tube holding means shown in FIG. 2, and FIGS. 7 and 8 are cross-sectional views of main parts of the liner tube showing an expanding step in which the end is expanded.

As shown in FIGS. 1 and 2, PTFE according to one embodiment of the present invention
The liner tube end expanding device 2 is made of, for example,
It has a pipe holding means 10 for holding the vicinity of the flange 8 side of the metal pipes 5, 6 into which the liner tube 4 is inserted as shown in the figure. The end 4a of the liner tube 4 projects from the flange surfaces of the metal tubes 5, 6 by a predetermined length, and this portion is expanded along the flange surfaces.

In the present embodiment, the tube holding means 10 comprises a pair of holding pieces 12, 14, as shown in FIGS.
V-shaped notches 16, 18 for sandwiching the metal tube 5 from both sides
Is formed. Each of the holding pieces 12 and 14 can move close to and away from each other in the Y-axis direction along a pair of guide rods 21 and 22 arranged in parallel on the support base 20. The movement of the holding pieces toward and away from the Y-axis direction is performed by the drive rod 24 and the clamp handle 26. The drive rod 24 is formed with screw portions in mutually opposite directions.
2,14 mesh. And drive rod 24
Are rotated by the clamp handle 26.

In the present embodiment, the following mechanism is provided to make such tube holding means 10 movable in three axial directions perpendicular to each other.

In order to translate the tube holding means 10 in the Y-axis direction, the outer periphery of an outer cylinder 27 arranged on the outer periphery of the rod 24 so as to be coaxial with the Y-axis drive rod 24 is fixed on a support base 20 by a support plate.
The drive rod 24 is mounted on the inner periphery of the outer cylinder 27 so as to be relatively rotatable and move simultaneously in the axial direction, and the outer cylinder 27 is rotated by the Y-axis handle 28. It is possible. With this configuration, by turning the Y-axis handle 28, the drive rod 24 moves in parallel with the holding pieces 12, 14 in the Y-axis direction.

Further, in order to move the tube holding means 10 in the X-axis direction, a rod 32 for X-axis movement is mounted below the support base 20,
The bevel gear 34 formed at the tip of the X-axis drive rod 38 is screwed into the bevel gear 34 formed at the tip of the rod, and the X-axis handle 40 is rotated to rotate the X-axis moving rod 32. The support base 20 screwed to this moves in the X direction. Although not shown, a guide rod for guiding the X-axis movement is also mounted below the support table 20, whereby the support table 20 is instructed from below. With this configuration, by rotating the X-axis handle 40, the X-axis moving rod 32 is rotated, and the support base 20 is rotated.
Move in the X-axis together with the tube holding means 10.

In order to move the tube holding means 10 in the Z-axis direction (see FIG. 1), an auxiliary support table 41 is provided below the support table 20, and a male screw is formed on the support table 41. Four legs 42 are screwed together, and the outer periphery of the legs 42
, And a Z-axis gear 46 disposed at the center of the four gears 44 is screwed with each gear 44, and a rod 48 fixed to the Z-axis gear 46 can be rotated by a Z-axis handle 50. Has become.
By rotating the Z-axis handle 50, the respective gears 46 and 44 rotate, and the auxiliary support 41 moves in the Z-axis direction with respect to the base support 51. As a result, the tube holding means 10 also moves in the Z-axis direction. It is movable.

In this embodiment, it is unstable to hold the flange-side portion of the metal pipe 5 by the pipe holding means 10, and as shown in FIG. I support it at 53.

A jig holding board 54 is mounted on the base support table 51 so as to be rotatable in the direction A shown in FIG. The rotation shaft 55 is supported by a bearing 56 installed on the base support 51. A plurality of flare jigs 57, 58, and 59 (three in this embodiment) are installed on the jig holding plate 54 so as to protrude toward the tube holding means 10. Each of these flare jigs 57 to 59 includes a jig holding plate 54
Is rotated about the rotation axis 55, the rotation radius from the rotation axis 55 is substantially equal to the axis of the liner tube 4 in the metal pipe held by the pipe holding means 10. Attached to the same position.

Moreover, each of the flare jigs 57 to 59 is attached to the jig holding plate 54 so as to be movable in the axial direction so as to be movable forward and backward in the direction of the tube holding means 10. Specifically, at the rear end of each of the jigs 57 to 59, there are formed rods 60, 61, and 62 for axial movement, and these rods 60 to 62 are fixed to bearings 63, 6
It is mounted so that the axis can be moved by 4,65. At any time, the rear ends 60a, 61a, 62a of the rods 60-62 are so arranged that the jigs 57-59 are at the maximum retracted position with respect to the tube holding means 10.
A return spring 66 is mounted between the jig holding plate 54 and the jig holding plate 54, respectively.

Also, as shown in FIG. 3, both sides of the base support 51 and the jig holding plate 54 are formed by a pair or a plurality of pairs of springs 68 so that the jig holding plate 54 stops at a predetermined intermediate rotation position. It is to be connected. A handle 70 is formed at an outer peripheral position of the jig holding plate 54. An operator can put his / her hand on the handle 70 and turn the jig holding plate 54 in the direction of arrow A with relatively little force. ing.

The first flare jig 57 of the plurality of flare jigs is
The jig tip angle θ ₁ (see FIG. 2) is used for the initial expanding step as shown in FIG. 7, and is 70 to 100 degrees, preferably 85 to 95 degrees. The first flare jig 57 is equipped with a heating means (not shown).
It is possible to heat to about 350 to 370 ° C. The heating temperature is determined so as to soften and not gel the PTFE liner tube, although it depends on the pressing time described later. As the heating means, a band heater or the like is exemplified, and it is preferable to control the jig heating temperature by attaching a temperature sensor or the like.

Second flare jig 58 is for use in medium-term widening step, the jig tip angle theta ₂ is 100-140 degrees, preferably 110 to 130 degrees. The heating temperature of the jig 58 is 150
~ 200 ° C is preferred. The heating means and the heating control can be performed similarly to the first flare jig 57.

The third flare jig 59 is for use in the final expanding step as shown in FIG. 8, and the tip shape is a convex shape according to the flange surface shape to be lined. Third flare jig 59 used for final spreading process
Is preferably cooled without heating. Therefore, cooling water is circulated in the jig 59.

A jig pressing means 72 is provided on the control device 74 on the jig holding plate 54 on which the jig is mounted, on the side of the rod rear ends 60a to 62a of the jig. The control device 74 includes the jigs 57 to 59
This is for controlling the temperature, the pressing force control or the pressing time control by the pressing means 72, and is installed on the base support 51.

In the present embodiment, the pressing means 72 includes a pressing rod 77 and a pressure cylinder 76. The supply and discharge control of the pressure fluid to and from the pressure cylinder 76 is performed by the control device 74. Push rod 77
When the axis of any of the jigs 57 to 59 substantially matches the axis of the end of the liner tube, the jigs 57 to 59 are installed at positions where the rod rear ends 60a to 62a, which are the rear ends of the jigs, can be pressed. ing. When the pressure cylinder 76 is driven and the pressing rod 77 protrudes and presses one of the rod rear ends 60a to 62a, the corresponding jigs 57 to 59 are pressed against the end of the liner tube to expand it. become. The pressing force and pressing time by the pressing rod 77 differ depending on the jig. For example, in the case of the first flare jig 57 and the second flare jig 58, the pressing force is when the cylinder diameter of the pressure cylinder 76 is 80A, The pressing force is preferably such that the fluid pressure of the pressure fluid is about 7 kg / cm ^{2 in} gauge pressure, and the pressing time is 2 to 3 minutes. In the case of the third flare jig 59, the pressing force is preferably about the same as described above, and the pressing time is 2 to 10 minutes. When the pressing by the pressing rod 77 is released, the pressed jig is automatically returned to the original position by the force of the return spring 66.

Using such a PTFE liner tube end expanding device 2, the end 4a of the liner tube 4 inserted into the flanged metal tube 5 as shown in FIGS. In order to follow the joining surface of the flange 8, the following procedure is performed.

First, the metal pipe 5 is fixed by the pipe holding means 10 shown in FIGS.
And fix it near the flange.

Next, the handles 28, 40, 50 are operated, and the tube holding means 10 is moved to X,
The metal tube 5 is moved by moving in the Y and Z axis directions.

Thereafter, the operator puts his hand on the grip 70 of the jig holding plate 54 and rotates the holding plate 54, and the axis of the first flare jig 57 and the end of the liner tube inside the pipe held by the tube holding means 10. The axis of the portion 4a is substantially aligned with the axis. Next, the pressure cylinder 76 is driven, the pressing rod 77 is made to protrude, the rod rear end 60a is pressed, and the first flare jig 57 is pressed against the liner tube end 4a as shown in FIG. At this time, since the jig holding plate 54 is rotatable, even if the axis is slightly deviated, the holding plate 54 slightly rotates, so that the axis of the jig and the liner tube is substantially complete. Matches.

Hereinafter, if the flare jigs 58 and 59 are sequentially pressed against the liner tube end 4a in the same manner, the end opening step is completed, and the tube end 4a is connected to the flange 8 as shown in FIG. It is finally expanded by approximately 90 degrees along the joint surface.

Note that the present invention is not limited to the above-described embodiments, and can be variously modified within the scope of the present invention.

For example, the tube holding means 10 and the jig pressing means are not limited to the above-described embodiment, but may be any as long as they exhibit these functions.

Further, the structure of the jig holding plate 54 is not limited to the above embodiment.

Advantageous Effects of the Invention As described above, according to the present invention, since the flare jigs are collectively mounted on the jig holding plate, the temperature control of each flare jig required for a series of expanding steps or Control such as pressing force or pressing time can be performed collectively, which facilitates systematization or management of the control.

In addition, since the jig holding plate is mounted so that it can rotate freely,
Subtle centering (axis alignment) between each flare jig and the liner tube also becomes extremely easy.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a PTFE liner tube end expanding device according to an embodiment of the present invention, FIG. 2 is a plan view of the expanding device, and FIG. 3 is a flare jig shown in FIG. FIG. 4 is a schematic view taken along the line III-III of FIG.
Schematic arrow view along the IV-IV line, FIGS. 5 and 6 are schematic cross-sectional views of the liner tube before the end is expanded by the same expanding device, and FIGS. 7 and 8 are the expanded end. It is principal part sectional drawing of a liner tube which shows the spreading process performed. 2 ... PTFE liner tube end opening device 4 ... liner tube, 4a ... tube end 5 ... metal tube, 8 ... flange 10 ... tube holding means, 54 ... jig holding plate 55 … Rotating shaft 57,58,59… Flare jig 72… Jig pressing means, 77… Press rod 76… Pressure cylinder

Claims (3)

(57) [Claims] A PT capable of expanding an end of a polytetrafluoroethylene resin liner tube lined in a flanged metal tube along a flange surface.
In a FE liner tube end expanding device, tube holding means for holding the vicinity of a flange of a metal tube into which the liner tube is inserted, such that an end of the liner tube protrudes from a flange of the metal tube. A plurality of flare jigs that are sequentially pressed against the end of the liner tube to gradually expand the end of the liner tube along the flange surface, and that these flare jigs are movably held in the axial direction. A jig rotatably mounted so as to be positioned at a position where the axis of each flare jig substantially coincides with the axis of the liner tube inserted into the metal tube held by the tube holding means. When the axis of one of the flare jigs substantially coincides with the axis of the liner tube, the rear end of the flare jig is pressed, and the flare jig is pressed. PTFE liner tube end widening device and a jig pressing means for pressing the end portion of the liner tube. 2. One of the flare jigs is a final expansion jig, which has a cooling means, and the other flare jigs include:
2. The PTFE liner tube end expanding device according to claim 1, further comprising a heating means. 3. The apparatus according to claim 1, wherein said pipe holding means includes three pipe holding means.
3. The PTFE liner tube end expanding device according to claim 1 or 2, further comprising a tube holding unit moving means for moving the tube holding unit in the axial direction.