JPH07108602A - Pipe end processing machine - Google Patents

Abstract

PURPOSE:To provide a pipe end processing machine in which a die body replacing time can be shortened and number of components can be deleted. CONSTITUTION:The pipe end processing machine slidably form peripheral surfaces 21c, 21d of a base end 21b at sealing parts 4, opens a front door of an outer member, opens an opening 8 of a leading end side 7 of an intermediate airtight cylinder 3, and pushes out a die body 42 from the end 21b side thereby to allow a molded part 5 to protrude from the cylinder 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention heat-deforms an end of a pipe made of a thermoplastic resin material such as a vinyl chloride pipe used mainly for water supply and drainage of buildings and water supply and sewerage to process a socket. The present invention relates to a pipe end processing device used at that time.

[0002]

2. Description of the Related Art As a conventional device of this kind, for example,
There is one as shown in FIG. 12 to FIG.
-73513, JP-B-61-2023, etc.). In such a structure, first, the shell 5 on the tip side 2a of the mold body 2 is attached to the end 1a of the heated resin pipe 1.
Insert a in a bulged state (FIG. 14).

While the seal portion 4 of the intermediate airtight cylinder 3 seals the peripheral surface 2c of the base end portion 2b of the mold body 2, the end portion 1a comes into contact with the front surface 4a of the seal portion 4 and stops. To do. The intermediate airtight cylinder 3 includes a seal portion 4 and a tip side 2a.
An airtight cylindrical portion 6 extends around the molded portion 5.
A front door portion 10 of an outer member 9 is rotatably disposed in an opening 8 on the tip side 7 of the airtight cylindrical portion 6, and is configured to close the opening 8 to be in an airtight state. (Fig. 1
5).

In this state, the space 11 formed by the front door portion 10 and the airtight cylindrical portion 6 is air-pressurized to 5 to 9 atmospheres to press the end portion 1a against the molding portion 5 to a predetermined position. This end 1a is formed into a shape. At this time, the cooling air is introduced into the molding portion 5 through the air hole 4b formed in the seal portion 4 of the intermediate airtight cylinder 3.

The intermediate airtight cylinder 3 is slid toward the base end 2b of the mold body 2 to introduce cooling air into the space 11 to cool the end 1a (FIG. 1).
6). After cooling, the shell 5a is immersed in the molding portion 5 (FIG. 17), the mold body 2 is retracted to the right in the drawing, and the molding portion 5 is pulled out from the end portion 1a to make the resin pipe 1
The molding of the end portion 1a of (1) is completed (FIG. 18).

This step is almost the same as that of the so-called sleeve-type die 12 in which the shell 5a is not projected and retracted from the molding portion 5 shown in FIGS. 19 to 21, except that pressurization is not required because it is simple in shape. The same is done. In this sleeve mold 12, the intermediate airtight cylinder 3 is changed to a sliding seal member 13 in which the airtight cylindrical portion 6 is not provided.

The change of the die body is carried out as shown in FIGS. 12 and 13. That is, first, the outer member 9 is detached, moved to the storage location, and the piston rod 14a of the hydraulic cylinder 14 to which the mold body 2 is connected is contracted to the retracted position. Then, the mold exchanging jig 15 is applied from below the intermediate airtight cylinder 3, and the intermediate airtight cylinder 3 is pulled out from the tip portion 2a side. After the change of the mold body 2, this time, the assembly is performed by the procedure reverse to the above procedure.

At the time of this replacement, in order to support the weight of the die main body 2, the connecting structure between the tip end portion of the piston rod 14a and the base end portion 2b side connecting portion of the die body 2 is connected to the base end portion 2b side. The flange portion 2d formed on the above portion faces the flange portion 14c formed on the tip end portion of the piston rod 14a, and is fixed by several bolts.

[0009]

However, in such a conventional example, the engagement between the peripheral surface 2c and the seal portion 4c is tight in order to improve the sealing property. For this reason, when the intermediate airtight cylinder 3 is pulled out from the tip 2a side when the die body is replaced, the piston rod 14a of the hydraulic cylinder 14 is once retracted, and the force at the time of retracting is used to remove the engagement. ing. Therefore, when the fitting is removed, the piston rod 14
The stroke of "a" has reached the full retracted position, the mold exchanging jig 15 is inserted into the gap between the outer member 9 and the intermediate airtight cylinder 3, and this time the intermediate airtight cylinder 3 is pulled out to the right in FIG. There must be. However, since the intermediate airtight tube 3 has a large outer shape and a large weight, it must be supported from below by using a large mold exchanging jig 15 that can bear a load. Due to the insertion of the large mold changing jig 15, the outer member 9 had to be removed while avoiding interference.

Further, unless the outer diameter of the molding portion 5 is smaller than the inner diameter of the seal portion 4, it cannot be extracted from the tip portion 2a side, and the peripheral surface 2c having the same diameter or more than the outer diameter of the molding portion 5 is formed. Depending on the type of mold body 2 formed, a plurality of seal parts 4
It was necessary to prepare the intermediate airtight cylinder 3 having the inner diameter dimension of 3 and replace it at the same time as the mold body.

Therefore, there is a problem that it takes a long time for replacement, the number of parts is increased, and a storage space for parts is required to be wide.

[0012] Therefore, an object of the present invention is to provide a pipe end processing apparatus which can shorten the time for exchanging the die body and reduce the number of parts.

[0013]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, the end portion of the heated resin pipe is fitted from the front end side of the mold body to a predetermined shape. Intermediate air-tightness having a seal portion for sealing the peripheral surface of the base end portion of the mold body when forming the end portion into a shape and an airtight cylindrical portion extending from the seal portion to the periphery of the forming portion on the tip side. A closed space is formed by a tube and an outer member having a front door section that closes the opening on the tip side of the intermediate airtight tube to be in an airtight state, and the pipe end section is formed by air pressurizing the space. A pipe end processing device capable of pressing against a forming part, wherein a peripheral surface of the base end part is formed slidably with respect to the seal part, and a front door part of the outer member is opened, and the intermediate part Open the opening on the tip side of the airtight cylinder,
The pipe end processing device is characterized in that the molding part can be projected from the inside of the intermediate airtight cylinder by pushing out the mold body from the base end side.

[0014]

[Operation] According to the invention having such a configuration, when the mold body is replaced, the peripheral surface of the base end portion slides with respect to the seal portion by pushing out the mold body from the base end side. Then, the molding portion projects from the inside of the intermediate airtight cylinder and is exposed from the opening. Therefore, the mold body can be pulled out by a jig or the like, and the mold body can be easily replaced.
After the replacement of the mold body, the mold body is retracted back into the intermediate airtight cylinder and returned, and the peripheral surface of the base end portion is sealed again with the seal portion to complete the replacement.

Therefore, it is not necessary to remove the outer member as in the conventional case when replacing the mold body.

Further, as in the conventional case, it can be replaced regardless of the outer diameter of the molding portion, and if the diameter of the peripheral surface of the base end portion is unified, conventionally, it is manufactured corresponding to a plurality of mold bodies. The existing intermediate airtight cylinder can be shared by one intermediate airtight cylinder, which shortens the replacement time of the mold body and reduces the number of parts.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings.

1 to 11 show an embodiment of the present invention. The same or equivalent members as the conventional ones will be described with the same reference numerals.

First, the structure will be described. In the figure, reference numeral 1 is a resin pipe, and an end portion 1 of the heated resin pipe 1 is shown.
The sleeve-shaped mold main body 21 is moved forward to a so that the tip end side 21a of the mold main body 21 is fitted. Around the mold body 21, an annular stop member 22 is provided for adjusting the insertion amount of the end portion 1a by bringing the end portion 1a of the resin pipe 1 into contact with the front end portion 22a. An air hole 23 for introducing cooling air is formed in the stop member 22 and is electrically connected to the space inside the mold body 21.

When the end 1a of the resin pipe 1 comes into contact with the stop member 22, the stop member 22 moves in the gap 22c along the right direction in FIG. 6, which is the axial direction of the mold body 21,
A confirmation dog 25a is provided as a confirmation slide member that operates the pipe insertion confirmation limit switch 24 at the stop position of the mold body 21.

The confirmation dog 25a has a bottom surface adapted to the shape of the molding portion 5 to have an arcuate shape, and has a substantially rectangular plan shape, and the locking projections 25b are provided forward and backward from the upper surface portion of the stop member 22. 25b is formed so as to project upward, and the locking projections 25b, 25b are configured to abut at the front and rear positions on the locked bridge portion 22b formed in a part of the stop member 22.

Further, the seal portion 4 of the intermediate airtight cylinder 3 which is substantially the same as the conventional one is provided with a confirmation rod 16 slidable in the front-rear direction.

Then, the pipe end 1a is connected to the front end face 25.
When it comes into contact with c, the front end portion 1 of the confirmation rod 16 is attached to the rear end surface 25d.
The pipe insertion confirmation limit switch 2 which is brought into contact with the rear end portion of the confirmation rod 16 while sliding the contact 6a.
4 is configured to operate.

The intermediate airtight cylinder 3 is supported by airtight cylinder support rods 17a extending from the airtight cylinder support plate 17. The airtight cylinder support plate 17 is configured to move along the axis of the mold body 21, which is the left-right direction in FIG. 6, by the airtight cylinder slide hydraulic cylinder 17b.

In the figure, reference numeral 26 is an intermediate airtight cylinder advance position confirmation limit switch, reference numeral 27 is a mold retreat position confirmation limit switch, reference numeral 28 is an intermediate airtight cylinder fixed position confirmation limit switch, and reference numeral 29 is an intermediate. This is a limit switch for checking the backward position of the airtight cylinder.

The intermediate airtight cylinder 3 is arranged around the mold body 21, and the sliding seal portion 4 of the intermediate airtight cylinder 3 is provided on the peripheral surface of the base end portion 21b of the mold body 21. 21c
It is formed so that it can be slidably contacted while sealing.

The intermediate airtight cylinder 3 is provided with an airtight cylindrical portion 6 extending from the seal portion 4 to the periphery of the molding portion 5 on the tip side 2a. A front door portion 10 of an outer member 9 is rotatably disposed in an opening 8 on the tip side 7 of the airtight cylindrical portion 6, and the tip of the die body 2 or the like that requires pressurization. Side 7
The front door portion 10 abuts on the front door portion 10 and closes the opening 8 to close the space 1.
The fact that the inside of 1 is made airtight is almost the same as the conventional one.

Then, as shown in FIGS. 4 and 5, in the mold body 42 requiring pressurization of this embodiment, the base end portion 21 is
A peripheral surface 21c around b is formed continuously with a slide peripheral surface 21d having a taper shape whose diameter gradually decreases toward the rear end direction. The slide peripheral surface 21d is configured to be slidable in the axial direction with respect to the seal portion 4. The slide peripheral surface 21d is also formed on the mold body 21.

Next, the mold attachment 30 will be described.

A mold attachment 30 is used to connect the rear end of the base end 21b of the mold body 21 and the tip of the piston rod 14a of the hydraulic cylinder 14.

The die mounting tool 30 is mainly used for the female die member 3.
1, a male member 33, and a fixing cylindrical portion 35.

Of these, the female member 31 is the base end portion 2
A cylindrical main body rear end facing surface 31 fixed to the rear end 1b
The fitting recess 32 is formed in b, and the screw portion 31c is formed in the peripheral surface 31a. This fitting recess 3
2 is a bottom surface 32b and an end facing surface 31b of the female member 31.
With a certain angle with respect to the guide side surface 32 as a guide inclined surface for guiding the insertion of the fitting convex portion 34
a, 32a. Further, a taper portion 31d is formed on the peripheral surface on the tip end side to facilitate insertion into the fixing cylindrical portion 35.

The male member 33 is the piston rod 14
a fitting convex portion 34 which is fixed to the tip of the fitting concave portion 32 and fits with the fitting concave portion 32 is formed on the cylindrical body front end facing surface 33b, and has a tapered surface at a predetermined angle with respect to the sliding direction of the piston rod 14a. The engaging flange portion 33a having the above is formed on the peripheral surface. The fitting convex portion 34 is formed corresponding to the upper surface portion 34c and the guide side surfaces 32a, 32a, and the side wall portion 34a, which has a certain angle with respect to the end facing surface 33b of the male member 33. 34a and the left and right guide walls 3 for guiding to correct the horizontal displacement
It is mainly composed of 4b and 34b.

The fixing cylindrical portion 35 is arranged around the male member 33, and the screw portion 31 of the female member 31 is provided.
It has an inner threaded portion 36 that is screwed into c and is rotatably disposed while being locked to the locking flange portion 33a.
By having a taper surface at a predetermined angle with respect to the locking flange portion 33a, a flange portion 37 for positioning in the vertical and horizontal directions at the time of tightening is configured. Further, a taper portion 35a is formed on the inner peripheral surface of the die side tip portion to facilitate insertion of the female die member 31. A rotating lever 38 is provided on the fixing cylindrical portion 35 so as to project therefrom.

Further, with the front door portion 10 of the outer member 9 opened, the opening 8 on the tip side 7 of the intermediate airtight cylinder 3 is opened, and the mold body 21 is pushed out from the base end portion 21b side. Thus, the axial dimension of the mold fixture 30 is set so that the molding portion 5 projects from the inside of the intermediate airtight cylinder 3.

Next, the operation of this embodiment will be described.

First, a so-called sleeve type die main body 21.
In the case where the stop member 22 is provided around the inside of the intermediate airtight cylinder 3 common to the conventional one, the stop member 2
When the front end portion 22a of 2 moves to the left in FIG. 1 and comes into contact with the end portion 1a of the resin pipe 1 which is heated and fitted,
The confirmation dog 25a is pushed by the end portion 1a and moves rightward in FIG. 6 along the axis of the mold body 21. The confirmation rod 16 whose tip 16a abuts against the confirmation dog 25a also slides in the right direction in FIG. 6 to bring the rear end portion into contact with the pipe insertion confirmation limit switch 24 to operate it. For this reason,
Even if the so-called sleeve type mold body 21 in which the stop member 22 is disposed is used for a type in which the mold body 21 moves in the direction of the resin pipe 1 and the tip side 21a is fitted, It can be stopped up to the position with the end 1a fitted.

After the stop, cooling air is introduced to cool the end portion 1a of the resin pipe 1 to process it into a fixed shape. Since the air hole 23 for introducing the cooling air is formed closer to the base end 21b than the disposition position of the stop member 22, the air hole 4b is used in the state where the intermediate airtight cylinder 3 is retracted to the rear position. Instead, the cooling air can be introduced into the space 11 from between the tip side 7 and the front door portion 10 through the opening 8.

The processing steps of the die main body 2 which require pressurization are substantially the same as the steps shown in FIGS. 14 to 18 of the conventional example. For this reason, the intermediate airtight cylinder 3 that has been conventionally manufactured corresponding to a plurality of different mold bodies 2 and 12
Also, the sliding seal member 13 can be shared by only one intermediate airtight cylinder 3, so that the replacement time between the mold body 21 and the mold body 12 can be shortened and the number of parts can be reduced.

Next, the process of exchanging the mold body will be described with reference to the mold body 42 shown in FIGS. 4 and 5. By advancing the piston rod 14a connecting the mold body 42 by the mold fixture 30,
The peripheral surface 21c of the base end portion 21b slides out of the engagement with the seal portion 4 by pushing the base end portion 21b leftward in FIG. A slide peripheral surface 21d that is continuous with the peripheral surface 21c also slides with respect to the seal portion 4 so that the molding portion 5 projects from the inside of the intermediate airtight cylinder 3 and is exposed from the opening 8. At this time, the lower surface side of the slide peripheral surface 21d contacts the seal portion 4 to support the mold body 42.

The mold exchanging jig 43 is small enough to support the mold body 42 by exposing the molding part 5.
And the molding portion 5 is supported by inserting the molding portion 5 into the gap between the airtight cylindrical portion 6 of the intermediate airtight cylinder 3. The die main body 42 has a weight smaller than that of the intermediate airtight cylinder 3, and therefore, even a small die exchanging jig 43 which can be inserted into a gap can be supported.

Next, the rotating lever 3 of the mold mounting tool 30.
8 is rotated to release the screwing of the inner screw portion 36 with the screw portion 31c, and release the connection between the female member 31, the male member 33, and the fixing cylindrical portion 35. Then, the mold body 42 is pulled out to the left in FIG. 5, and a new mold body is inserted, so that the mold body can be easily replaced.

The mold fixture 30 is connected in the following manner. A new mold body is inserted into the intermediate airtight cylinder 3 up to the position shown in FIG. Then, the piston rod 14a is advanced to the advanced position to move the end facing surface 3 of the male member 33.
3b is faced to the end facing surface 31b of the female mold member 31, the female mold member 31 is inserted into the fixing cylindrical portion 35, and the outer peripheral surface 31a of the female mold member 31 is covered. The female member 31 and the male member 33 are to be inserted into the same fixing cylindrical portion 35, whereby the vertical positioning is almost completed.

Next, when it is rotated by the turning lever 38, the inner threaded portion 36 is screwed into the threaded portion 31c formed on the outer peripheral surface 31a, and the collar portion 37 is retained by the retaining portion flange portion 33a. The two members 31 and 33 are pulled together. At this time, since the tapered surface of the locking flange portion 33b is in contact with the flange portion at a predetermined angle, the axis of the piston rod 14a side is gradually pulled toward the axis of the mold body, and the vertical and horizontal directions. The axis of is completely positioned.

When the facing surfaces 31b and 33b on both ends are brought close to each other and the fitting convex portion 34 is fitted into the fitting concave portion 32, the fitting convex portion 3 is formed.
4 is the guide side surfaces 32a, 3 formed in the fitting recess 32.
Guided by 2a, the die main body is rotated to a predetermined rotation angle position, and is fitted and fixed at a predetermined position while positioning in the rotation direction. For example, even if the sleeve type die main body 21 which does not require pressurization is fixed, the position of the confirmation dog in the rotation direction and the confirmation rod 1 arranged in the intermediate airtight cylinder 3 are fixed.
The position of the tip of 6 fits better with this positioning.

Therefore, the positioning and the fixing are performed at the same time, and the working efficiency is good. Moreover, it does not require multiple bolts as in the past, reducing the number of parts and
The connection work time between members can be shortened.

Furthermore, this female member 33 and male member 31
The fixing cylindrical portion 35 is arranged around the opposite surfaces 31b and 33b of the both ends, and the sectional area of the fixing cylindrical portion 35 is ring-shaped as compared with the cross-sectional areas of a plurality of conventional bolts. Therefore, even if the connecting structure has the same outer diameter, it is possible to secure sufficient connecting strength against the shearing force generated between the members 31 and 33. Therefore, even if the mold body 42 and the like are extracted from the opening 8 and replaced as in this embodiment, the outer diameter of the female mold member 31 is large enough to move in and out of the inside of the seal portion 4. Therefore, it is possible to prevent the interference with the seal portion 4.

After replacing the mold body, the mold body is retracted back into the intermediate airtight cylinder 3 by retracting the piston rod 14a to the retracted position, and the peripheral surface 21c of the base end portion 21b is sealed again while being fitted. The replacement is completed by sealing at part 4.

Therefore, it is not necessary to remove the outer member 9 as in the conventional case when the die body is replaced.

Further, as in the conventional case, the molding section 5 can be replaced regardless of the outer diameter, and if the diameter of the peripheral surface 21c of the base end portion 21b is unified, conventionally, a plurality of mold bodies 21 and It is possible to share the intermediate airtight cylinder that was manufactured for 42 etc. with one intermediate airtight cylinder 3 and shorten the replacement time of the mold body, reduce the number of parts, and secure the storage space as before. There is no need to do it.

Further, even in the case of the mold main body 21 having the stop member 22 on the outer periphery, since the base end 21b is pushed out and the mold main body 21 is replaced from the opening 8, it can be replaced. And the outer diameter of the molding part 5 is
Even the mold body having a larger inner diameter than the seal portion 4 can be replaced.

In the above embodiment, the female member 31 is provided at the rear end of the mold body 42 and the male member 33 is provided at the front end of the piston rod 14a. However, the present invention is not limited to this. 42. A male member 33 is attached to the rear end of the piston rod 14a.
You may make it arrange | position each female member 31 in a front-end part.

[0053]

As described above, according to the present invention, the peripheral surface of the base end portion slides with respect to the seal portion, and the molding portion projects from the inside of the intermediate airtight cylinder and is exposed from the opening. The mold body can be pulled out by a jig or the like, and the mold body can be easily replaced.

Therefore, it is not necessary to remove the outer member as in the conventional case when replacing the die body.

Further, as in the conventional case, it can be exchanged regardless of the outer diameter of the molding portion, and if the diameter of the peripheral surface of the base end portion is unified, conventionally, it is produced corresponding to a plurality of mold bodies. The existing intermediate airtight cylinder can be shared by one intermediate airtight cylinder, which shortens the replacement time of the mold body, reduces the number of parts, and eliminates the need to secure a storage space. Demonstrate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention and a process of processing an end portion using a sleeve-type mold body.

FIG. 2 is a cross-sectional view showing the same embodiment and showing a process of processing an end portion using a sleeve-type mold body.

FIG. 3 is a cross-sectional view showing the same embodiment and a process of processing an end portion using a sleeve-type mold body.

FIG. 4 is a partial cross-sectional view of a main part illustrating the same embodiment and illustrating how the mold body is replaced.

FIG. 5 is a partial cross-sectional view of a main part illustrating the same embodiment and explaining how to replace the mold body.

FIG. 6 is a cross-sectional view illustrating the same embodiment and illustrating a configuration using a sleeve-type mold body.

FIG. 7 is a top view of a sleeve-type mold body showing the same embodiment.

FIG. 8 is a perspective view of a male member showing the same embodiment.

FIG. 9 is a perspective view showing the same embodiment and showing the configuration of a mold attachment tool.

FIG. 10 is a cross-sectional view showing the same embodiment and showing a connected state of the mold fixture.

11 is a sectional view taken along the line AA of FIG. 10 showing the same embodiment.

FIG. 12 is a partial cross-sectional view of a main part illustrating a conventional example and illustrating how the mold body is replaced.

FIG. 13 is a partial cross-sectional view of a main part illustrating a conventional example and illustrating how the mold body is replaced.

FIG. 14 is a cross-sectional view showing a conventional example and showing a process of processing an end portion using a mold main body that requires pressurization.

FIG. 15 is a cross-sectional view showing a conventional example and showing a process of processing an end portion using a mold body that requires pressurization.

FIG. 16 is a cross-sectional view showing a conventional example and showing a process of processing an end portion using a mold main body which requires pressurization.

FIG. 17 is a cross-sectional view showing a conventional example and showing a process of processing an end portion using a mold body that requires pressurization.

FIG. 18 is a cross-sectional view showing a conventional example and showing a process of processing an end portion using a mold main body which requires pressurization.

FIG. 19 is a cross-sectional view showing a conventional example and a process of processing an end portion using a sleeve-type mold body.

FIG. 20 is a cross-sectional view showing a conventional example and a process of processing an end portion using a sleeve-type mold body.

FIG. 21 is a cross-sectional view showing a conventional example and a process of processing an end portion using a sleeve-type mold body.

[Explanation of symbols]

 1 Resin pipe 1a End part 3 Intermediate airtight tube 4 Seal part 5 Molded part 6 Airtight cylinder part 7 Tip side 8 Opening 9 Outer member 10 Front door part 21b Base end part 21c, 21d Circumferential surface 42 Mold body

Claims (1)

[Claims] 1. When the end of a heated resin pipe is fitted from the tip side of a mold body to mold the end into a predetermined shape, the peripheral surface of the base end of the mold body is sealed. An intermediate airtight cylinder having a sealing part and an airtight cylindrical part extending from the sealing part to the periphery of the molding part on the tip side, and a front door for closing the opening on the tip side of the intermediate airtight tube to be in an airtight state A pipe end portion processing device capable of pressing the pipe end portion against a molding portion by forming a closed space with an outer member having a portion, and pressurizing the inside of the space with air. It is formed so as to be slidable with respect to the seal portion, and the front door portion of the outer member is opened, and an opening portion on the tip side of the intermediate airtight cylinder is opened to push the die body from the base end portion side. This allows the molded part to project from the inside of the airtight cylinder. Pipe end processing device to be collected.