JPS6347609B2 - - Google Patents

Abstract

PURPOSE:To enable the titled pipes to be inserted smoothly into a socket without compressing, reducing the pipe diameters by a method wherein pipings are grasped by clamping devices, the segments of the pipings except the inserting lengths of the pipings are grasped by clamping devices and the pipings are inserted to connect each other. CONSTITUTION:In connection of plastics that two pipings P are grasped by separate clamping devices 5, 6 and the pipings P are press-fitted to a socket to connect each other, when the segments of the pipings except the inserting length L1 of a piping (such as a socket S1) are grasped by a clamping device (such as an auxiliary clamping device 33) and the pipe P is inserted into the socket S1, the pipe can be inserted smoothly into the socket S1 because the diameter of the segment of the inserting length L1 of the socket S1 is not compressed and reduced by the outer periphery.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting plastic pipes.

Generally, the method for connecting two pipes is to grasp the two pipes with separate clamp mechanisms, and use a heater block provided between both clamp mechanisms to tighten the mating connection range of both pipes. A method is adopted in which the pipes are heated and then the two pipes are fitted and connected. In addition, as a method of gripping pipes with a clamp mechanism, for example, when connecting a socket and a pipe, for the pipe that is inserted into the socket, of course the outer periphery of the pipe outside the fitting connection range is held by the clamp mechanism. For a socket that fits on the outer circumferential side of a pipe, the clamp mechanism grips the socket within the fitting connection range, that is, the end of the socket on the mating pipe side.

However, when the fitting connection area of a socket or the like is grasped, the diameter of the inner circumferential surface of the fitting connection area of the socket is reduced, which causes a problem in that the work of fitting the pipe into the socket cannot be carried out smoothly. In particular, in plastic pipe connection methods such as fitting and connecting pipes that are heated,
If the fitting process takes a lot of time, the pipes will get cold and a good connection will not be possible. In other words, there is a possibility that the connection cannot be made reliably.

Even if the pipes, such as sockets, fit onto the outer periphery of the other pipe, the present invention can hold the pipes outside the fitting connection range using a clamp mechanism. This is intended to facilitate the fitting and connecting work of comrades. First, an example of a plastic pipe connecting device for carrying out the present invention will be explained with reference to the drawings.

In FIG. 1, a guide plate 1 having a certain length is supported at both ends by a frame 2, and casters 3 are easily attached to and detached from each frame 2. As shown in FIG. Guide rail 1
As shown in FIG. 2, there are two parallel wires spaced apart from each other. First and second clamp mechanisms 5 and 6 are provided on both the left and right sides of the guide rail 1 in FIG. 7 is fixed so that the position in the rail length direction can be changed. A heater block 8 is detachably provided on the pedestal 7, and on both sides of the heater block 8, first and second heater attachments 9, 10 each having a cylindrical shape with a bottom are fixed to each other by bolts 11 at the same center. .

To explain the first clamp mechanism 5 in detail, the first clamp mechanism 5 consists of an upper holder 13 and a lower holder 14, as shown in FIG.
A pair of bosses 15 are integrally provided at the left and right lower end portions of the lower holder 14 in FIG. 3, and these bosses 15 are fitted to the rail 1 (FIG. 1) via the bushes. One end of the upper holder 13, for example the left end side in FIG.
The upper holder 13 can be opened around the pin 16. A bolt 19 is rotatably supported at the upper right end of the lower holder 14 in FIG. 3 via a horizontal pin 17, and a nut 20 is screwed into the tip of the bolt 19. On the other hand, a right-opening bolt insertion groove 21 (see FIG. 2) is formed at the free end (right end in FIG. 3) of the upper holder 13.
That is, by turning the bolt 19 counterclockwise to an upwardly protruding position as shown in Fig. 3 and then tightening the nut 20, it is possible to tighten the pipes inserted into the sleeve 23, or to move the rail in the longitudinal direction. The goal is to guide you. The sleeve 23 is divided into upper and lower halves, and the outer circumferential groove of the lower sleeve portion 23b meshes with the upper-opening semicircular circumferential edge 14a of the lower holder 14 so as not to be able to move in the axial direction, and the upper sleeve portion 23a has its outer circumferential groove The groove is a downwardly opening semicircular peripheral edge 13a of the upper holder 13.
It is meshed and fitted so that it cannot move in the axial direction. Further, an upper holder 13 is provided at the upper end of the upper sleeve portion 23a.
A bolt 24 that protrudes upward through the upper hole is fixed, and a nut 2 is attached to the upper end of this bolt 24.
6 by tightening the upper sleeve part 2
3a is held so that it cannot fall off.

Two auxiliary rails 28 are removably fixed to the lower end of the lower holder 14 so as to extend parallel to the rails 1 on the side opposite to the pedestal 7, as shown in FIG. For example, a stepped bolt portion 28 formed at the end of the auxiliary rail 28 on the arrow A side (frame 7 side)
a is inserted into the bolt insertion hole 30 of the lower holder 14 and tightened with a chrysanthemum nut 31. The auxiliary rail 28 is provided with an auxiliary clamp mechanism 33 having a similar structure to the first clamp mechanism 5 and whose position in the rail length direction can be adjusted. That is, the auxiliary clamp mechanism 33 consists of an upper holder 34, a lower holder 35, etc., and a boss 36, and the boss 36 fits into the auxiliary rail 28. However, a lock bolt 37 that is perpendicular to the auxiliary rail 28 is screwed into the boss 36, and by tightening the lock bolt 37, the auxiliary clamp mechanism 33 can be fixed at any position on the auxiliary rail 28. 38 is a sleeve for the auxiliary clamp mechanism.

The second clamp mechanism 6 has a similar structure to the first clamp mechanism 5, and parts corresponding to the first clamp mechanism 5 are given the same numbers as the first clamp mechanism 5. 39 is a sleeve for the second clamp mechanism.

As shown in FIG.
They are integrally connected by a bottom plate 42, a block regulating pin 43 shown in FIG. 4, and the like. A pair of bosses 41 are provided on the left and right sides of FIG. 4, and each is fitted into the guide rail 1 via a bush. The boss 41 is movable in the rail length direction with respect to the rail 1, but the lock bolt 45 is perpendicular to the rail 1.
is screwed into the rail, and by tightening a lock bolt 45, the position of the rail in the longitudinal direction can be fixed. That is, the pedestal 7 is fixed to the rail 1 so that its position in the rail length direction can be changed. Further, both plates 40 are formed with a generally semicircular recess 40a (FIG. 4) that opens upward.

The heater block 8 is inserted between the plates 40 from above, and the circular notches 8a at the lower left and right ends of FIG. 4 are engaged with the bosses 41. For example, a handle 48 (FIG. 1) is fixed to the upper end of the heater block 8, and the heater block 8 can be taken out upward from the pedestal 7 by holding this handle 48. Heater block 8 is connected to a suitable power source,
For example, 240 with heater attachments 9 and 10.
It can be heated up to about ℃.

Next, a hydraulic cylinder mechanism for independently moving the first clamp mechanism 5 (and the auxiliary clamp mechanism 33) and the second clamp mechanism 6 in the rail length direction will be described. As shown in FIG. 2, in the plastic pipe connecting device, a first hydraulic cylinder 51 is arranged on the arrow A side of the pedestal 7 (the right side in FIG. 2), and a second hydraulic cylinder 51 is arranged on the arrow B side of the pedestal 7 (the left side in FIG. 2). A hydraulic cylinder 52 is arranged. As shown in FIG. 1, the first hydraulic cylinder 51 is supported at the lower end portion of the side surface indicated by arrow A (the right side surface in FIG. 1) of the pedestal 7 via a pair of first pin receivers 53 and a horizontal support pin 54. The rod 55 extends along the lower side of the rail 1 in the direction of arrow B through a rod passage hole 56 at the lower end of the pedestal 7, and is attached to a horizontal pin at the two crotches 57 at the lower end of the lower holder of the first clamp mechanism 5. 58. Reference numerals 59 and 60 denote first and second oil supply parts, which are connected to appropriate hydraulic pressure supply mechanisms and switching valves, and supply oil to the first oil supply part 59 to move the rod 55 in the direction of arrow A. Pull the first clamp mechanism 5 and the auxiliary clamp mechanism 33 in the direction of arrow A.
move in the direction. Further, by supplying oil to the second oil supply section 60, the rod 55 is pushed out in the direction of arrow B, and the first clamp mechanism 5 and the auxiliary clamp mechanism 33 are moved in the direction of arrow B.

The second hydraulic cylinder 52 is also the first hydraulic cylinder 51
It has a similar structure as shown in FIG. 2, and is supported via a horizontal pin 62 by a second pin receiving part 61 fixed to the side of arrow B of the pedestal 7 (left side of FIG. 2). The rod 63 extends in the direction of arrow A, and is connected to the lower end bifurcated portion 64 of the second clamp mechanism 6 via a horizontal pin 65. 66, 67
are first and second oil supply parts, which are connected to the hydraulic pressure supply mechanism and the switching valve. By supplying oil to the first oil supply part 66, the rod 63 is pulled in the direction of arrow B, and the second oil supply part 66 is pulled in the direction of arrow B. Move the clamp mechanism 6 to the arrow B side. Further, by supplying oil to the second oil supply section 67, the rod 63 is pushed out in the direction of arrow A, and the second clamp mechanism 6 is moved in the direction of arrow A.

Next, a method for connecting pipes using the illustrated connecting device will be described. First, the second clamp mechanism 6 (first
For example, in the case shown in Fig. 1, a joint P' to which a pipe P is fixed is held. Of course, the gripping position of the second clamp mechanism 6 is outside the fitting connection range _L2 of the pipe P. On the other hand, a socket _S1 , for example, is inserted into the first clamp mechanism 5 and the auxiliary clamp mechanism 33. The socket S ₁ is gripped with strong pressure by the auxiliary clamping mechanism 33, but little pressure is applied by the first clamping mechanism 5. That is, the first clamping mechanism 5 only guides the centering of the socket _S1 . The position where the auxiliary clamp mechanism 33 grips the socket _S1 is on the arrow B side from the portion (width _L1 ) where the pipe P can fit into the socket _S1 . i.e. socket S ₁
The portion of the socket _S1 outside the fitting connection range _L1 is gripped by the auxiliary clamp mechanism 33.

Next, by contracting the rod 63 of the second hydraulic cylinder 52 (FIG. 2), the pipe P is moved in the direction of arrow B together with the second clamp mechanism 6, and is brought into constant pressure contact with the inner peripheral surface of the second heater attachment 10. Fit with force. Also, the rod 55 of the first hydraulic cylinder 51
By contracting, the socket S ₁ is moved in the direction of arrow A together with the auxiliary clamp mechanism 33 and the first clamp mechanism 5, and the socket S ₁ is fitted to the outer circumferential surface of the first heater attachment 9 with a constant pressure. . Note that if the pipe P and fitting P' are already fixed to equipment, etc. at a piping site, for example, the second
When the rod 63 of the hydraulic cylinder 52 is retracted, the frame 2, pedestal 7, etc. are attached to the caster 3 with respect to the second clamp mechanism 6, pipe P, and joint P'.
, the pipe P is relatively moved in the direction of the arrow A, and the pipe P is fitted into the second heater attachment 10. Furthermore, since the first clamp mechanism 5 does not apply pressure in the diameter reduction direction to the socket _S1 , the first heater attachment 9 fits smoothly into the socket _S1 . With the socket _S1 and the pipe P fitted into both attachments 9 and 10, respectively, the inner circumferential surface of the socket _S1 and the outer circumferential surface of the pipe P are heated by the heat from the heater block 8.

After heating, the rods 55 of both cylinders 51, 52,
63 and both heater attachments 9,
10, and apply adhesive to the inner peripheral surface of _the socket _S1 and the outer peripheral surface of the pipe P. Then, retract the rods 55, 63 of both cylinders 51, 52, fit the socket _S1 and pipe P into both heater attachments 9, 10,
Heat. In addition, both heater attachments 9 and 10
Since these are coated with Teflon, the socket _S1 and the pipe P will not adhere to the heater attachments 9 and 10 during the heating process.

After heating, the rods 5 of both cylinders 51 and 52 are
5, 63 and pull out the socket _S1 and pipe P from both heater attachments 9,10.

After that, the heater block 8 is taken out upward from the pedestal 7 together with the heater attachments 9 and 10, and the rods 55 and 6 of both cylinders 51 and 52 are reattached.
3, and fit the pipe P into the socket S ₁ with a constant pressure to connect both S ₁ and P. In this case as well, the person who is actually holding socket _S1 is the socket.
Auxiliary clamp mechanism 33 outside the mating connection range L ₁ of S ₁
Therefore, the inner circumferential surface of the socket in the fitting connection range _L1 is not compressed in diameter. Therefore, the pipe P fits smoothly into the socket _S1 .

FIG. 5 shows the case of gripping the flange type joint _S2 . That is, the flange gripping member 68 is gripped by the auxiliary clamp mechanism 33, and the flange portion S' ₂ (portion outside the fitting connection range L ₁ ) of the flange type joint S ₂ is gripped via the gripping member 68. ing. The gripping member 68 has two upper and lower parts.
The annular inner circumferential groove 69 and the annular outer circumferential groove 70 are provided at positions shifted from each other in the axial direction, and the flange portion S' ₂ of the flange type joint S ₂ is formed in the annular inner circumferential groove 69. The upper and lower holders 34 and 35 are engaged with the annular outer circumferential groove 70. In this case, the first clamp mechanism 5 is a flange type joint S ₂
Almost no pressure is applied in the direction of diameter reduction,
It simply guides the flange type joint _S2 . Therefore, the operation of fitting the flange type joint S ₂ to the second heater attachment 9 and the flange type joint S ₂
The operation of fitting the pipe inside can also be performed smoothly. The procedure for connecting the flange type fitting S ₂ and the pipe is the first step.
The procedure is similar to that described in the figure.

In FIG. 1, the auxiliary clamp mechanism 33 provided on the side opposite to the pedestal 7 (the side in the direction of arrow B) of the first clamp mechanism 5 is used to grip the portion of the socket S ₁ outside the fitting connection range L ₁ . However, in addition to such a method, for example, it is possible to extend the rail 1 in the direction of the arrow B and move the first clamp mechanism 5 itself in the direction of the arrow B to outside the fitting connection range _L1 of the socket _S1 . possible,
The first clamp mechanism 5 may grip a portion of the socket _S1 outside the fitting connection range _L1 .

As explained above, _the present invention provides a plastic pipe connection method in which two pipes are gripped by separate clamp mechanisms and the pipes are press-fitted and connected. Since the pipes outside the range _L1 are gripped by a clamp mechanism (for example, the auxiliary clamp mechanism 33), when fitting the pipe P into the socket _S1 , for example, the fitting of the socket _S1 is difficult. The diameter of the connection range _L1 is not compressed from the outer circumferential side. Therefore, the pipe P can be smoothly inserted into the socket _S1 , and the connection work can be performed easily and quickly. In particular, when heating the socket S ₁ and pipe P to connect them, the fitting connection can be quickly made before the temperatures of both S ₁ and P drop, so both S ₁ and P can be firmly and reliably connected. Can be connected.

It also has the following advantages:

(1) This method involves applying adhesive to the mating surfaces of pipes, heating them, and then bonding the mating surfaces together with the adhesive. In other words, in principle, this is a connection method using adhesive, and the purpose of heating is not to melt the mating surfaces, but to heat the mating surfaces of both pipes and the adhesive, and at the same time make it easier for both pipes to fit together. This is to soften the material.

Therefore, in a connection method using such an adhesive, the clamping mechanism 6, 33 does not apply the softened fitting connection area, but the area outside the fitting connection area that has not softened.
Since the fitting is gripped by the grip, it is possible to prevent the diameter of the fitting surface portion from shrinking when the fitting is gripped, and to enable smooth connection without restricting the deformation of the softened fitting connection portion at the time of connection.

(2) Each clamp mechanism 6, 33 grips each pipe from the outer circumferential direction, so compared to the method of holding the pipe by inserting a jig into the pipe, for example, the clamp mechanism is used when pulling out the pipe from the heater block. Pipes will not fall out of the socket, and even pipes such as sockets can be securely fixed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a plastic pipe connecting device for carrying out the present invention, FIG. 2 is a plan view of FIG. 1, and FIGS.
FIG. 5 is a partial vertical sectional view of the plastic pipe connecting device showing the case where the flange type joint is gripped. 33...Auxiliary clamp mechanism (an example of a clamp mechanism).

Claims (1)

[Claims] 1 The separate clamp mechanisms 6 and 33 clamp the pipe parts outside the fitting connection range of each of the two pipes from the outer circumferential direction, and the two pipes gripped by the respective clamp mechanisms 6 and 33 are fitted together. The mating surface is heated by the heater block 8, and after heating, the pipes are pulled out from the heater block 8, adhesive is applied to the heated mating surface, heated again by the heater block 8, and then removed from the heater block 8. A method for connecting plastic pipes, which comprises taking out the pipes again, and then press-fitting the pipes together and bonding them with the adhesive described above.