JPH10249939A - Opening/closing mechanism for thermal-shrinking tube heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply, rapidly and effectively execute a remote operation of an attaching or detaching operation of a heater used in the case of covering a welded part of a coated steel tube with a thermal-shrinking tube. SOLUTION: The mechanism comprises a semicircular casing 1-1, and a pair of circular arc-like casing 1-2 openably connected to the casing 1-2 via a hinge 2. In this case, as an opening/closing means of the casing 1-2 of a thermal shrinkage tube of a three-divided structure, a threaded screw 6 provided at the casing 1-2 side is rotated by an electric motor 3 provided at the casing 1-1 side via a bevel gear 4, rotary rods 5-2, 5-3 and universal joints 8-1 to 83, thereby opening/closing the casing to the right and left sides.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating apparatus for a heat-shrinkable tube (or sheet) for corrosion-protecting a welded joint portion of a coated steel pipe provided with a corrosion-resistant protective coating, and more particularly, to the heating apparatus. The present invention relates to an opening and closing mechanism for mounting a cylindrical heater having a divided structure to a coated steel pipe.

[0002]

2. Description of the Related Art In a pipe laying work for a gas pipe or the like provided with an anticorrosion protective coating, an on-site coating (repair coating) of a pipe joint (welded portion) is performed after the welding is completed. Heat shrink tubing (or sheet)
Is generally wound and the tube is heated and shrunk. As a construction method of heating and shrinking the heat-shrinkable tube, there are generally a method of performing a manual operation using a propane torch and a method of using a heating device.

As a method of using a heating device, for example, a heating device of a system of heating a heat-shrinkable sheet by externally fixing a cylindrical heater having a divided structure in which an annular heater is incorporated to a coated steel pipe (see Jpn. No. 170809, Jikken 63-16
No. 3962) or a heating device in which the inside of the heating device is decompressed to improve the adhesion of the tube (Japanese Patent Application No. Hei 6-301).
355) is known and has been put to practical use.

[0004] A heating device of a system in which a cylindrical heater having a divided structure is externally fixed to a coated steel pipe to heat the heat-shrinkable sheet is detachable from the coated steel pipe so as to surround the heat-shrinkable tube attached to the welded portion of the coated steel pipe. A cylindrical heater having a multi-segment structure, which is fitted and fixed to the outside, is provided with a hinge so as to be openable and closable. When the heating device is mounted on a coated steel pipe, the cylindrical heater with the split structure is opened to weld the coated steel pipe. After placing on the section, the heater is closed and attached to the coated steel pipe weld. As the opening / closing means of the cylindrical heater having the divided structure, there are a method in which the heater itself is suspended and opened by its own weight, pulled up and closed by a wire or a chain, and a method in which the heater is opened and closed by a fluid pressure cylinder such as an air cylinder. .

[0005] The opening / closing mechanism of the system of pulling up and closing by means of a wire or a chain is preliminarily connected with a wire or chain to a cylindrical heater having a divided structure, and the wire or chain is placed in a state where the heater is mounted on a coated steel pipe. Is closed by pulling. As a method of opening and closing by a fluid pressure cylinder, there is a mechanism in which a fluid pressure cylinder is mounted on the front and rear surfaces of the cylindrical heater in accordance with the number of divisions of the heater, and the cylinder is tuned to open and close. General.

[0006]

However, the above-mentioned conventional opening / closing mechanism for a cylindrical heater has the following disadvantages. In other words, in the case of an opening / closing mechanism of a system that is pulled up and closed by a wire, a chain, etc., when the cylindrical heater with the divided structure is opened and placed on the coated steel pipe, the divided body that is opened by its own weight is not fixed and freely swings by the hinge. Because it is suspended in a movable state, when it is displaced and dropped on the coated steel pipe, it may come into contact with the steel pipe and close,
There is a disadvantage that the setting work takes time. In addition, in the case of the opening / closing method using a fluid pressure cylinder, since the degree of opening of the divided body cannot be adjusted, it is difficult to install the divided body in a covered steel pipe when the divided body in an open state interferes with a beam of a digging groove or the like. There are drawbacks. Furthermore, both of the above-mentioned opening and closing methods require a mechanism for locking when the cylindrical heater is closed, and the operation must be performed manually, and the operation is performed in a narrow excavation groove, so that much work is required. There is a problem that it takes time and also involves danger, which is not preferable in terms of workability and safety.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks in a heating device of a type in which a heat-shrinkable tube is heated by a cylindrical heater. An object of the present invention is to provide an opening and closing mechanism of a heat shrinkable tube heating device that can be quickly and accurately performed.

[0008]

According to the present invention, the opening / closing means of the divided body of the cylindrical heater is electrically operated so that the opening / closing operation of the divided body can be freely controlled, and a lock mechanism in the closed position is not required. The gist of the invention is that it comprises a cylindrical heater having a multi-segment structure that is removably externally fixed to the coated steel pipe so as to surround the heat-shrinkable tube attached to the coated steel pipe weld, and the cylindrical heater is An opening / closing mechanism for a heat-shrinkable tube heating device comprising a plurality of divided bodies attached to be openable and closable by hinges, wherein an opening / closing screw screw attached to the divided bodies is installed in the cylindrical heater. The split body is opened and closed right and left by rotating it via a rotation transmission mechanism consisting of a bevel gear, a rotating rod, and a universal joint by an electric motor. It is an.

A specific example of the structure is a semicircular casing and a pair of arc-shaped casings attached to the casing so as to be openable and closable left and right with hinges.
An opening / closing mechanism for a heat-shrinkable tube heating device comprising a cylindrical heater having a divided structure, wherein an opening / closing screw screw attached to the arc-shaped casing is bevel-geared by a single electric motor installed on the semicircular casing side. , By rotating through a rotation transmission mechanism consisting of a rotating rod and a universal joint, the arc-shaped casing opens and closes left and right.

The cylindrical heater according to the present invention has a plurality of divided structures such as two or three, and hinges a divided body constituting the cylindrical heater so as to be detachably fitted to the outer periphery of the coated steel pipe. It is structured so that it can be opened and closed freely from side to side. A heating source such as an annular heater is incorporated inside the openable cylindrical casing.

According to the present invention, as an opening / closing means of the cylindrical heater having the above-mentioned divided structure, one electric motor is installed on the divided body placed on the coated steel pipe, and a hinge is attached to the upper divided body. A bevel gear provided on the upper split body side, provided with an opening and closing screw screw on the lower opening type split body side connected via
By rotating the opening / closing screw screw via a rotation transmission mechanism including a rotating rod and a universal joint, a mechanism that opens and closes a lower-opening divided body to which the screw is screwed is adopted. . That is,
This opening / closing mechanism has a method of controlling the opening / closing operation of the divided body by an electric motor, so that the opening / closing operation of the divided body can be remotely controlled, the opening degree of the divided body can be freely adjusted, and the closing operation can be performed. Since the lock at the position can be fixed by the frictional force of the screw, a lock mechanism is not required.

A heat-shrinkable tube heating apparatus comprising a cylindrical heater having a three-part structure comprising a semicircular casing and a pair of arc-shaped casings attached to the casing so as to be openable and closable left and right with hinges. In such a case, the divided body placed on the coated steel pipe is a semicircular casing, and a pair of arc-shaped casings is attached to both sides of the casing with hinges to constitute a cylindrical heater. Then, an electric motor, a bevel gear, and a rotating rod are mounted on the semicircular casing side, and an opening / closing screw screw mounted on the arcuate casing side is configured to be rotatable via a universal joint.

When the inside of the heating device is decompressed to improve the adhesion of the tube, the contact portion of the cylindrical heater with the coated steel pipe and the joint portion are sealed with a seal packing, and the cylindrical heater is sealed. A vacuum evacuation pipe may be connected to one end of the heater, and the other end of the pipe may be connected to a vacuum pump or a vacuum generator to perform vacuum evacuation.

[0014]

FIG. 1 is a front view showing an embodiment of an opening / closing mechanism of a heat shrinkable tube heating apparatus according to the present invention.
1 is a side view of the opening and closing mechanism of the heat shrinkable tube heating device of the above, wherein 1 is a cylindrical heater, 1-1 is a semicircular casing,
1-2 is an arc-shaped casing, 2 is a hinge, 3 is an electric motor, 4 is a bevel gear, 5-1 to 5-3 are rotating rods, 6
Is a screw screw for opening and closing, 7 is a nut, and 8-1 to 8-3
Is a universal joint, 9-1 to 9-4 are bearings,
0 is a sprocket, 11 is a roller chain, and 12 is a coated steel pipe. Here, a cylindrical heater having a three-part structure will be described as an example.

The cylindrical heater 1 comprises one semi-circular casing 1-1 and two arc-shaped casings 1-2. The upper ends of the two arc-shaped casings 1-2 are semi-circular. The casing 1 is rotatably connected to the casing 1-1 via a hinge 2, and can be opened and closed left and right with the hinge 2 as a fulcrum. Each casing incorporates a heater (not shown) for heating the heat-shrinkable tube (not shown) of the coated steel pipe weld over the entire surface.

The opening / closing mechanism according to the present invention comprises an electric motor 3 installed above a semicircular casing 1-1 of the cylindrical heater 1 and bearings 9- on both sides of the electric motor above the semicircular casing. 1, two rotating rods 5-1 transversely arranged in the pipe axis direction, a sprocket 10 and a roller chain 11 for transmitting the rotation of the electric motor 3, and bearings 9 protruding from both end surfaces of the semicircular casing 1-1. -Two rotary rods 5-2 installed at an angle in the vertical direction at -2 and 9-3,
And two rotating rods 5-3 vertically mounted by bearings 9-4 protruding near the hinge 2 and nuts 7 protruding near the hinge 2 on both end surfaces of the two arc-shaped casings 1-2. And two opening / closing screw screws 6 vertically screwed coaxially with the vertical rotating rod 5-3, and the semicircular casing 1
Bevel gear 4 for transmitting the rotation of the two rotary rods 5-1 laterally mounted on the upper part of the casing 2-1 to the two rotary rods 5-2 inclined on both end surfaces of the casing; Two rotating rods 5-3 vertically mounted by a rotating rod 5-2 and a bearing 9-4;
3 comprises universal joints 8-1, 8-2 and 8-3 for connecting the screw 6 for opening and closing, and the rotation of the electric motor 3 installed on the upper part of the semi-circular casing 1-1 is circular. A bevel gear 4 is attached to an opening / closing screw 6 vertically screwed to the end face of the casing 1-2.
Transmitted via a transmission mechanism consisting of universal joints 8-1 to 8-3 and rotating rods 5-1 to 5-3,
The rotation of the screw causes the arc-shaped casing 1-2 to rotate.
Is a mechanism that opens and closes. That is, this opening / closing mechanism is a mechanism that opens and closes the arc-shaped casing 1-2 by changing the rotation direction of the electric motor 3, and a mechanism that can fix the operating position of the arc-shaped casing 1-2 by the electric motor 3. ing. Therefore, it is needless to say that the electric motor 3 in this opening / closing mechanism is a reversible motor capable of normal rotation and reverse rotation.

When the heat-shrinkable tube heating device having the above-described opening / closing mechanism is mounted on the coated steel pipe 12, the electric motor 3 is started, and the opening / closing screw screw 6 is turned to screw the screw. The two arc-shaped casings 1-2 are opened to a required degree of opening in accordance with the diameter of the coated steel pipe 12, the electric motor 3 is stopped and the open state is maintained, and the semi-circular casing 1-1 is closed. The semi-circular casing 1-1 is closed by operating the electric motor 3 again in the opposite direction, and then the electric motor 3 is locked when the electric motor 3 is stopped with the casing completely closed. The cylindrical heater 1 is externally fitted to the coated steel pipe 12.

When removing the heat-shrinkable tube heating device externally fitted to the coated steel pipe 12 from the steel pipe, the electric motor 3 is started again to activate the semicircular casing 1 of the cylindrical heater 1.
-1 is opened and detached from the coated steel pipe 12 in a state where it is opened until it can be detached and held at that position.

In the above description, a cylindrical heater having a three-part structure has been described as an example. However, in the case of a two-part structure, for example, a pair of left and right or a pair of front and rear semicircular casings are joined to each other with hinges so that they can be opened and closed right and left. An opening and closing mechanism similar to the above may be provided in the semicircular casing.

[0020]

As described above, according to the opening / closing mechanism of the present invention, the opening / closing operation of the open / close type heater having a plurality of divided structures can be freely controlled, and a lock mechanism is not required. Can be installed on the coated steel pipe, which eliminates the need for the operator to enter the excavation trench, ensuring the safety of the work, and also allows the heater to be installed quickly and easily. On-site coating of pipe joints (welded parts) (repair coating)
Has a tremendous effect.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an opening / closing mechanism of a heat shrinkable tube heating device according to the present invention.

FIG. 2 is a side view of an opening and closing mechanism of the heat shrinkable tube heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical heater 1-1 Semi-circular casing 1-2 Arc-shaped casing 2 Hinge 3 Electric motor 4 Bevel gear 5-1-5-3 Rotating rod 6 Screw screw for opening and closing 7 Nut 8-1-8-3 Universal joint 9-1 to 9-4 bearing 10 sprocket 11 roller chain 12 coated steel pipe

Claims (2)

[Claims] 1. A cylindrical heater having a multi-part structure detachably fitted to and fixed to a coated steel pipe so as to surround a heat-shrinkable tube attached to a coated steel pipe welded portion, and the cylindrical heater is opened and closed by a hinge. An opening / closing mechanism for a heat-shrinkable tube heating device comprising a plurality of divided bodies freely attached, wherein one open / close screw screw attached to said divided body is installed in said cylindrical heater. Wherein the split body is opened and closed right and left by being rotated through a rotation transmission mechanism comprising a bevel gear, a rotating rod and a universal joint. 2. A divided cylindrical heater which is detachably fitted to and fixed to a coated steel pipe so as to surround a heat-shrinkable tube mounted on a welded part of the coated steel pipe. The cylindrical heater includes a semicircular casing and a semicircular casing. An opening and closing mechanism for a heat-shrinkable tube heating device having a three-part structure including a pair of arc-shaped casings attached to the casing so as to be openable and closable left and right with hinges, the opening and closing attached to the arc-shaped casing. A mechanism for opening and closing the arc-shaped casing left and right by rotating a screw screw for rotation via a rotation transmission mechanism including a bevel gear, a rotating rod and a universal joint by one electric motor installed on the semicircular casing side. An opening / closing mechanism for a heat-shrinkable tube heating device, characterized in that: