JPH081527A - Device for press shutting off plastic pipe - Google Patents

Abstract

PURPOSE:To facilitate operations for press shutting off an embedded plastic pie by providing a booster driving part provide on the side of a gate-shaped frame, a holding plate for pressing the outer surface of a plastic pipe and an operating rod extending upward for operating the gate-shaped frame. CONSTITUTION:A hole for receiving a press shutting-off device to an embedded plastic pipe 37 is excavated from the ground surface. Next, a gate-shaped frame 30 with an operating rod 51 is lowered from the ground surface into the hole so that front and rear locating blocks 44 is adapted to abut against the upper surface of the plastic pipe 37 and mounted thereon. Under such a condition, a hydraulic pump of the ground is operated to make oil pressure act on hydraulic cylinders 34, 35, drive pistons 36, 36 of hydraulic cylinders, move left and right holding plates 38 to the central side and press shut off the plastic pipe 37 supported by a located block 44 with the left and right holding plates 38, 38. Thus, the attaching operation of the plastic pipe to press shutting-off device is simplified and a fluid shutting-off operation can be facilitated to embedded pipings with the minimum limit of excavated holes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic pipe crimping method suitable for digging holes in a plastic pipe buried underground and crimping the plastic pipe by operation from the ground to shut off fluid in the pipe. It relates to the device.

[0002]

2. Description of the Related Art A conventional plastic pipe crimping device is shown in FIGS. 4 and 5 disclosed in Japanese Utility Model Publication No. 57-58475. The device of FIG. 5 has a U-shaped frame 10
A hydraulic booster 12 that operates vertically on the upper arm 11.
And a push plate 13 is attached to the lower end of the booster 12, and a plastic pipe 15 is attached between the lower arm 14 of the U-shaped frame 10 and the push plate 13 to send hydraulic pressure to the booster 12. Lower arm 1 by operating pump 16
The plastic pipe 15 is pressure-bonded between the pressure plate 4 and the push plate 13. The tube pressing surfaces of the push plate 13 and the lower arm 14 are parallel to each other.

In the apparatus shown in FIG. 5, an upper arm 22 having a hydraulic booster 21 which operates in the vertical direction is provided on the upper portion of a U-shaped frame 20 so as to be openable and closable by a pin 23. The upper arm 22 uses the pin 23 as a fulcrum. Open and attach the plastic tube 25, and attach the upper arm 22 to the other end of the U-shaped frame 20 by pin 2
After fixing with 4, the hydraulic pump is operated to crimp the plastic pipe 25 between the lower arm 27 of the U-shaped frame 20 and the push plate 28 at the lower end of the booster. Also push plate 2
The tube pressing surfaces of 8 and the lower arm 27 are surfaces parallel to each other.

[0004]

In the conventional crimping device shown in FIG. 4, the frame 10 of the crimping device is attached to the plastic pipe 15 or the frame is attached to the plastic pipe 15 in the work on the ground where the working place can be freely taken. A plastic tube 15 can be mounted inside the frame 10 and crimped. However, if you want to work from the ground and work with a minimum drilling hole area for the plastic pipe that is buried underground, lower the device from the ground to the side of the underground plastic pipe 15 and then pipe the device. It must move axially so that a plastic tube can be inserted between the lower arm 14 of the device and the push plate 13. Therefore, the drilling hole must also be largely dug on one side of the plastic tube, and the device must be moved laterally towards the tube axis after it has been lowered into the hole. Therefore, the work operation is complicated.

In the apparatus shown in FIG. 5, because of the U-shaped frame 20, it is difficult to mount the pipe in the U-shaped frame unless the operator enters the hole into the hole and operates it. That is, the pins 23 and 24 must be removed to remove the upper arm 22 from the frame 20. Also, the device is attached to the pipe from the lower side of the pipe, and after the attachment, the upper arm 22
Must be mounted on the frame 20, and this work is difficult when operated from the ground.

In the pipe crimping device of FIGS. 4 and 5, the push shafts of the boosters 12 and 21 push the central portions of the push plates 13 and 28, and the push plates 13 and 28 move to the center of the plastic pipes 15 and 25. Press the part. Therefore, both ends of the push plate are not supported and are in an open state, and moreover, since the bent part of the plastic pipe is pressed, both ends escape and the center part of the push plate inevitably crimps the pipe before both ends, The drive of the booster does not proceed any further. Therefore, there is a problem that the bent portions at both ends of the crimped plastic pipe are not completely crimped and the fluid in the pipe leaks from the bent portions. The present invention solves the above-mentioned conventional problems and provides a plastic pipe crimping device capable of easily crimping a plastic pipe buried underground by an operation from the ground. Further, the present invention provides a pipe crimping device that surely crimps both bent portions of both ends of the pipe.

[0007]

DISCLOSURE OF THE INVENTION The gist of the present invention is to provide a portal frame that extends from above a plastic tube, and a boost drive that drives toward the center side provided on the side portion of the portal frame. Section, a holding plate for pressing the outer surface of the plastic tube provided on the drive side of the booster drive section, and an operation rod extending upward for operating the portal frame provided on the portal frame. It is a characteristic plastic pipe crimping device. Further, in the crimping device that presses the outer surface of the plastic pipe by driving the boost drive unit integrated with the frame, the pressing unit that presses the outer surface of the pipe is centered with respect to the bent parts at both ends when the pipe is pressed. The plastic pipe crimping device is characterized in that a relief portion is provided at a portion that presses the portion, and the bent portions at both ends of the pipe are crimped more than at the central portion side.

[0008]

Since the present invention has the above-mentioned structure, the gate-shaped frame is lowered from the ground to the axial center of the embedded plastic pipe by placing it on the upper surface of the embedded plastic pipe, and the plastic pipe is placed in the crimping device. Can be attached. The plastic tube is mounted in the crimping device, and the pressing plate is driven by the boosting drive unit provided on the side frame, and the plastic tube is crimped by the pressing plate. Further, the pressing portion for directly pressing the plastic pipe is provided with a clearance for both ends at the central portion for pressing the pipe, and the bent portions at both ends of the pipe are crimped more than at the central portion side. For this reason, even if the pressing plate escapes when the plastic pipe is crimped, and even if the bent portions at both ends of the plastic pipe have a large resistance, the bent portions at both ends are strongly pressed first, and then the central portion is pressed. Therefore, the conventional problem that the central portion of the pipe comes into contact first and the crimping drive cannot be performed any more is solved. Therefore, since the bent portions at both ends of the plastic pipe are securely crimped, a reliable seal can be obtained as compared with the conventional case.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view of the embodiment, and FIG. 2 is a side view. The gate-shaped frame 30 is a buried plastic pipe 37.
And side frames 31 and 32 located on both sides of the frame, and an upper frame 33 connecting the side frames 31 and 32. The side frames 31 and 32 are provided with two hydraulic cylinders 34 and 35 respectively on the upper and lower sides.
A pressing plate 38 for crimping the side portion of the plastic tube 37 is connected to the central portion driving side of the pistons 4 and 35 via a pressing plate fixing base 47. Further, the holding plate 38 has two springs 39, 40 provided in the middle portion of the cylinder.
Are pulled toward the side frames 31, 32, and when the hydraulic pressure of the hydraulic cylinders 34, 35 is released, the holding plate 38 and the piston 36 return to their original open state.

The hydraulic pipes for driving the hydraulic cylinders 34, 35 on both sides are connected with a hydraulic hose from a hydraulic pump (not shown) to the branch joint 41, and an adapter joint 42,
It is sent to the side frame cylinders 34, 35 via the in-frame passage 43. To the upper frame 33, positioning blocks 44, 44 having V-grooves whose lower surfaces protruding from the front and rear portions thereof come into contact with the pipe 37 are fixed. This block 44 can be adjusted by a nut 45 so that the plastic pipe 37 is located at the central position of the hydraulic cylinders 34 and 35, and the blocks 44 are exchanged by bolts 46 and 46 according to the diameter of the plastic pipe 37 to be crimped. And the tube 37 can be crimped in the middle of the hydraulic cylinders 34 and 35.

An operating rod 51 is fixed to the upper surface of the portal frame 30. The operating rod 51 may have a length such that it can be operated from the ground to the position of the buried plastic pipe 37,
It has a sheath tube system and can be adjusted to an appropriate length. FIG.
The states of the holding plate 38 before and after the tube pressure bonding are shown in FIG. In the state before pipe crimping in FIG. 3-a, the pipe crimping surface 48 side of the holding plate 38 is a surface parallel to the holding plate fixing base 47, but the surface 49 on the fixing base 47 side opposite to the pipe crimping surface is , And is provided in a shape having an escape portion 50 between the pressing plate fixing base 47 and the pressing plate fixing base 47, which are successively thinner in the central portion side.

When the plastic tube 37 is crimped by the holding plate 38, the holding plate 38 is elastically deformed as shown in FIG. The thick-walled portions at both ends of the holding plate 38 strongly press-fit the vertically bent portions of the plastic pipe, and the center portion holds the holding plate 3
Escape portion 50 of 8 escapes elastically. Therefore, the bent portions at both ends of the pipe are securely crimped and the central portion of the pipe is elastically and reasonably crimped, so that the inner surface of the pipe is uniformly crimped and leakage from the bent portions at both ends is prevented. It should be noted that the relief portion 50 may be provided on the tube crimping surface 48 side of the holding plate 38 before the tube crimping. Further, in this embodiment, the hydraulic cylinders are provided on both side frames, but they may be provided only on one side frame if the stroke of the cylinder is sufficient. In this case, the clearance portion 50 may be provided on the tube contact surface of the frame for crimping the tube on the side opposite to the hydraulic cylinder.

Next, the method of use will be described. First, a hole into which the device is inserted is excavated from the ground for the buried plastic pipe 37. Next, the operation frame 46 is held from the ground and the portal frame 30 is lowered into the hole, and the front and rear positioning blocks 44 are brought into contact with the upper surface of the plastic tube 37 and placed. In this state, operate the hydraulic pump on the ground to move the hydraulic cylinder-3.
The hydraulic pressure is applied to the hydraulic pressure cylinders 4, 35 to drive the pistons 36, 36 of the hydraulic cylinders to move the left and right pressing plates 38 to the center side, and the plastic pipe 37 supported by the positioning block 44 is moved to the left and right pressing plates 38, Crimp at 38.

[0014]

As described above, in the plastic pipe crimping device of the present invention, the operation rod is operated from the ground to lower the device onto the axis of the buried plastic pipe and place it on the upper surface of the buried pipe. Can be fitted with a pipe. Therefore, the work of mounting the plastic pipe in the device can be easily performed, and the buried pipe can be drilled with a minimum of drilling holes. Therefore, the work of crimping the pipe and closing the fluid can be easily and easily performed. Further, the entire inner surface of the pipe is uniformly crimped to prevent leakage from the bent portions at both ends.

[Brief description of drawings]

FIG. 1 is a partial front sectional view of a plastic pipe crimping device according to an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a partial detailed view showing a holding plate 38 before and after tube crimping.

FIG. 4 is a diagram showing a conventional crimping device.

FIG. 5 shows another prior art crimping device.

[Explanation of symbols]

31, 32 Side frame 33 Upper frame 34, 35 Hydraulic cylinder-36 Piston 37 Embedded plastic pipe 38 Holding plate 39, 40 Spring 41 Branch joint 42 Adapter joint 43 Hydraulic passage 44 Positioning block 45 Nut 46 Bolt 47 Holding plate fixing Table 48 Tube crimping surface of the holding plate 49 Surface of the holding plate opposite to the tube crimping surface 50 Relief part 51 Operation rod

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kazuyuki Miyazaki 19-18 Sakurada-cho, Atsuta-ku, Nagoya-shi, Aichi Toho Gas Co., Ltd.

Claims (2)

[Claims] 1. A gate-shaped frame that straddles a plastic pipe from above, a booster driving unit that is provided on a side portion of the portal-shaped frame, and that drives toward the center side, and a drive of this booster driving unit. A plastic pipe crimping device comprising a holding plate for pressing the outer surface of a plastic pipe provided on the side and an operation rod extending upward for operating the gate frame provided on the gate frame. 2. In a crimping device that presses the outer surface of a plastic pipe by driving a booster drive unit provided integrally with a frame, the pressing unit that presses the outer surface of the pipe is bent at both ends when the pipe is pressed. On the other hand, the plastic pipe crimping device is characterized in that a relief portion is provided at a portion that presses the central portion, and the bent portions at both ends of the pipe are crimped more than at the central portion side.