KR101650540B1 - Apparatus for correcting measurement error of distance between each joining objects in butt fusion of polyethylene pipes - Google Patents

Apparatus for correcting measurement error of distance between each joining objects in butt fusion of polyethylene pipes Download PDF

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Publication number
KR101650540B1
KR101650540B1 KR1020150061029A KR20150061029A KR101650540B1 KR 101650540 B1 KR101650540 B1 KR 101650540B1 KR 1020150061029 A KR1020150061029 A KR 1020150061029A KR 20150061029 A KR20150061029 A KR 20150061029A KR 101650540 B1 KR101650540 B1 KR 101650540B1
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South Korea
Prior art keywords
distance
correction
measuring
unit
distance measurement
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KR1020150061029A
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Korean (ko)
Inventor
이기원
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주식회사 세전더블유엠에스
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/16—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring distance of clearance between spaced objects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

Disclosure of the present invention is directed to a method of joining a large diameter polyethylene pipe such as a cooling water inlet pipe of a nuclear power plant or a city gas transfer pipe by a butt joining heat fusion method, A distance measuring apparatus for measuring a distance between a first bonding surface and a second bonding surface of a first pipe and a second pipe, A first and second clamps respectively coupled to and fixed to the first and second pipes; A measuring bar provided on at least one of the first and second clamps; A distance measuring unit for measuring a moving distance by using an electrical signal generated in accordance with the movement of the measuring rod; And an error correction unit coupled to one side of the distance measurement unit for adjusting a relative position of the distance measurement unit with respect to the measurement rod to correct a difference between the distance measured by the distance measurement unit and the actual travel distance, The present invention provides a first aspect of the present invention is a distance measuring error correction apparatus for a welded joint of a polyethylene pipe.

Description

TECHNICAL FIELD [0001] The present invention relates to a distance measurement error correction apparatus and a distance measurement error correction apparatus. [0001] The present invention relates to a distance measurement error correction apparatus,

Disclosure of the Invention The present invention relates to an apparatus for correcting a distance measurement error between joint surfaces in the case of welding a polyethylene pipe by heat welding and more particularly to a method of butt joining a large diameter polyethylene pipe such as a cooling water inlet pipe for a nuclear power plant, The present invention relates to an apparatus for correcting an error between a measured distance and an actual distance between pipes to be joined in a process of joining by a heat welding method.

Herein, the background art relating to the present invention is provided, and they are not necessarily referred to as known arts.

When a large amount of cooling water or city gas is supplied to a necessary place in a nuclear power plant or a city gas reservoir, a metal pipe is mainly used as a piping material.

However, for example, in a nuclear power plant, a large amount of cooling water is required to cool a primary coolant in a nuclear power plant. Accordingly, a large-diameter cooling water inlet pipe is buried in the sea, and seawater is taken out through it to be used as cooling water. When a metal pipe is used as a lead-in pipe, there is a problem that the lead pipe is easily corroded by seawater. Therefore, recently, a synthetic pipe such as a polyethylene pipe is used instead of a metal pipe as a coolant intake pipe.

In particular, polyethylene has excellent chemical resistance, hygienic properties, flexibility, light weight, and the like compared with other materials. Particularly since polyethylene has no electric corrosion (corrosion corrosion) and corrosion and can be used semi-permanently, It is used not only for the inlet pipe but also for the upper and the sewage pipes and for gas transfer.

When such a polyethylene pipe is used for piping, it is necessary to connect the polyethylene pipes to each other. In the method of connecting the polyethylene pipes, there are a mechanical connection method using a metal coupling and a method of connecting using a heat. Since the coupling and the connecting material used for it are made of metal, there is still a possibility of corrosion. In the case of connecting the polyethylene pipe, a method of connecting using mainly heat is used.

Heat fusion method and electro fusion method are also used for the connection of polyethylene pipe by using heat. Butfusion method, socket fusion method, And saddle fusion, and electric fusion is divided into electric socket fusion and electric saddle fusion. In this case, the heat fusion method is a method of melting a portion to be connected by using an external heat source, And electric fusion is a fusion method in which a part to be connected is melted and connected by inserting a heating coil into a joint pipe and applying a power source to the heat wire of the joint pipe to generate a connection, Since there is an inconvenience to use a separate connecting pipe (socket) for socket welding, when connecting the cooling water inlet pipe and the gas transfer pipe, The butt-welding method by heat fusion pipe does not need to be used.

When polyethylene pipes are connected to each other by the butt welding method, first, the two pipe ends to be connected are cleaned through the process of removing an oxide film formed on the outer surface of the pipe during the production of the pipe, and then the soil or dust is removed. After the polyethylene pipes are clamped by a fusing device and arranged in a line at regular intervals, the pipes are aligned so that the opposite cross sections of the pipes to be connected exactly match each other.

After the two pipes are accurately aligned on the fusing device by the above process, a plate-shaped heater is inserted between the two pipe ends to melt the end of the pipe, and then the two pipes are connected to each other The joint is completed by applying a suitable pressure until the molten part is cooled after it is left.

The joining procedure is performed by using an electronic control device when joining two pipes during the above process. The interval between two pipes is measured for each joining step (T1 to T5 in FIG. 1) .

That is, the distance measured at each bonding process step is a very important process variable, which is a potentiometer (a device that measures a linear displacement or a rotational displacement by detecting a change in electrical resistance).

However, when an error between the actual distance between the bonding surfaces and the measurement distance is generated, the bonding process proceeds abnormally, resulting in a decrease in bonding strength and a frequent occurrence of cracks (see Patent Documents 1, 2 and 3).

1. Patent Document 0001) JP 2001-162898 A 2. Patent document 0002) US 8128853 B2 3. Patent document 0003) US 2006-0032349 A1

It is an object of the present disclosure to provide an apparatus for correcting an error between a measured distance and an actual distance between bonding surfaces in a process of bonding a polyethylene pipe by a butt joining heat fusion method.

The present invention is not intended to be exhaustive or to limit the scope of the present invention to the full scope of the present invention. of its features).

In order to solve the above-described problems, the present disclosure relates to a method for measuring the distance between the first and second bonding surfaces during a thermal fusion bonding process of first and second bonding surfaces of first and second pipes separated from each other An apparatus for correcting a distance measurement error between joint surfaces in a welded polyethylene pipe for correcting a measurement error of a distance measuring apparatus, comprising: first and second clamps respectively coupled to and fixed to the first and second pipes; A measuring bar provided on at least one of the first and second clamps; A distance measuring unit for measuring a moving distance by using an electrical signal generated in accordance with the movement of the measuring rod; And an error correction unit coupled to one side of the distance measurement unit for adjusting a relative position of the distance measurement unit with respect to the measurement rod to correct a difference between the distance measured by the distance measurement unit and the actual travel distance, The present invention provides a first aspect of the present invention is a distance measuring error correction apparatus for a welded joint of a polyethylene pipe.

The present disclosure relates to an apparatus for correcting a distance measurement error between bonding surfaces in the case of heat-sealing of a polyethylene pipe according to the first invention, wherein the error correction unit measures a relative position of the distance measurement unit with respect to the measurement bar from 0.1 mm to 1 mm To the second aspect of the present invention.

The present disclosure relates to an apparatus for correcting a distance measurement error between bonding surfaces in the case of heat sealing of a polyethylene pipe according to the first invention, wherein the error correction unit has one end connected to one side of the distance measurement unit, A correction bar formed to be elongated in the same direction as the moving direction, the correction bar having a thread having a pitch of 0.1 mm to 1 mm on the outer surface; A correction nut screwed into the correction rod; And a stationary support which is fitted in the correction rod and is disposed on at least one side of both sides of the correction nut and restricts the movement of the correction nut in a state in which correction is completed.

The present disclosure relates to an apparatus for correcting a distance measurement error between bonding surfaces in a heat fusion bonding process of a polyethylene pipe according to the third invention, wherein the fixing nut is screwed to the correction bar, And a fixing nut located on the opposite side of the fixing nut.

The present disclosure relates to an apparatus for correcting a distance measurement error between joint surfaces in the case of the fusion welding of a polyethylene pipe according to the third invention, wherein the correction bar is connected at one end to one side of the distance measurement unit, A first correction bar formed to be elongated in the same direction as the first correction bar; And a second correction rod linked with the first correction rod and coupled with the correction nut and the fixed support.

According to the present disclosure, it is possible to easily correct the error between the actual distance and the distance between the bonding surfaces required in the process of heat sealing the polyethylene pipe, thereby improving the accuracy of the process and the quality of the bonding.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a relationship between a time and a bonding pressure in a heat-sealing process of a polyethylene pipe. FIG.
2 is a view showing a first embodiment of an apparatus for correcting a distance measurement error between bonding surfaces in the case of a polyethylene pipe heat-sealing according to the present disclosure;
3 is a view showing a second embodiment of an apparatus for correcting a distance measurement error between joining surfaces in a heat pipe welding process of a polyethylene pipe according to the present disclosure;
4 is a view showing a third embodiment of an apparatus for correcting a distance measurement error between bonding surfaces in the case of heat-sealing a polyethylene pipe according to the present disclosure.

Hereinafter, various embodiments in which an apparatus for correcting a distance measurement error between bonding surfaces during heat-sealing of a polyethylene pipe according to the present disclosure is implemented will be described with reference to the drawings.

It should be understood, however, that there is no intention to limit the scope of the present disclosure to the embodiments described below, and that those skilled in the art, having the benefit of the teachings of this disclosure, It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

In addition, the terms used below are selected for convenience of explanation. Therefore, in order to grasp the technical contents of the present disclosure, they should be interpreted appropriately in accordance with the technical idea of the present disclosure without being limited to the prior meaning.

2 is a view showing a first embodiment of an apparatus for correcting a distance measurement error between bonding surfaces in the case of a polyethylene pipe heat fusion according to the present disclosure.

Referring to FIG. 2, in the apparatus for correcting the distance measurement errors 100 between the bonding surfaces in the heat fusion bonding process of the polyethylene pipe according to the present embodiment, the first and second pipes 10 and 20, 21 between the first and second bonding surfaces 11 and 21 during the heat fusion bonding process of the bonding surfaces 11 and 21 of the polyethylene pipe for correcting the measurement error of the distance measurement device for measuring the distance between the first and second bonding surfaces 11 and 21. [ And includes a clamp 110, a measuring bar 120, a distance measuring unit 130, and an error correcting unit 140. The distance measuring unit 130 includes a clamp 110, a distance measuring unit 130,

The clamp 110 is fixedly coupled to the first and second pipes 10 and 20 and is moved together with the first and second pipes 10 and 20 during the bonding process.

The measurement rod 120 is provided on all or one of the clamps 110 (the state shown in FIG. 2 is provided in the first clamp 110).

The distance measuring unit 130 is provided as an apparatus for measuring a moving distance by using an electrical signal (for example, a change in resistance) generated in accordance with the movement of the measuring rod 120.

For example, a potentiometer may be mentioned.

The error correction unit 140 is coupled to one side of the distance measurement unit 130 to adjust the relative position of the distance measurement unit 130 with respect to the measurement rod 120, And compensates for the difference between the distance traveled and the actual travel distance.

Specifically, the error correction unit 140 includes a correction bar 141, a correction nut 142, and a fixed support 143.

One end of the correction rod 141 is coupled to one side of the distance measurement unit 130 and is elongated in the same direction as the movement direction of the measurement rod 120.

Further, the correction rod 141 is formed with a thread having a pitch of 0.1 mm to 1 mm on its outer surface.

The correction nut 142 is provided to be screwed into the correction rod 141.

The correction nut 142 adjusts the relative position of the distance measurement unit 130 with respect to the measurement rod 120 by pushing or pulling the correction rod 141 by rotation.

Therefore, it is preferable that the correction nut 142 is provided with a handle shape on its outer circumference for easy rotation.

The fixed support 143 is fitted to the correction rod 141 and is arranged to be disposed on at least one side of both sides of the correction nut 142. And preferably includes a correction nut 142 on both sides thereof.

The fixed support 143 restricts the movement of the correction nut 142 in a state where the correction is completed.

To this end, one side of the fixed support 143 is preferably coupled to a separate, fixed position.

In the present embodiment, the error correcting unit 140 is preferably provided so that the relative position of the distance measuring unit 130 with respect to the measuring rod 120 is adjusted in units of 0.1 mm to 1 mm .

This is to enable precise error correction using fine adjustment.

3 is a view showing a second embodiment of an apparatus for correcting a distance measurement error between bonding surfaces in a heat pipe welding process of a polyethylene pipe according to the present disclosure.

This embodiment is similar to the first embodiment in most of the configurations but is a fixing nut 144 that is screwed to the correction rod 141. The fixing nut 144 is fixed to the opposite side of the correction nut 142 And a fixing nut 144 positioned at the lower end of the fixing nut 144 is further provided.

In this way, the fixing of the correction nut 142 can be surely secured in a state in which the correction is completed.

In the present embodiment, the description of other structures except for the fixing nut 144 is omitted in the description of the first embodiment, and is omitted here.

Fig. 4 is a view showing a third embodiment of a distance measurement error correcting apparatus between bonding surfaces in the case of a polyethylene pipe heat-sealing according to the present disclosure. Fig.

In this embodiment, most of the configuration is the same as that of the first embodiment, except that the correction bar 141 is connected to the first and second correction bars 141a and 141b coupled by the link member 145 so as to allow relative hinge movement There is a difference in terms of being provided.

The first correction rod 141a is connected at one end to one side of the distance measurement unit 130 and is formed long in the same direction as the movement direction of the measurement rod 120. [

The second correction rod 141b is linked with the first correction rod 141a, and the correction nut 142 and the fixed support 143 are coupled.

According to this, even if the first and second correction bars 141a and 141b are not located on a straight line, they can be corrected.

In the present embodiment, the description of other components except for the first and second correction bars 141 is omitted in the description of the first embodiment, and is omitted here.

Claims (5)

A polyethylene pipe column for correcting the measurement error of the distance measuring device for measuring the distance between the first and second bonding surfaces during the heat fusion bonding process of the first and second bonding surfaces of the first and second pipes, An apparatus for correcting a distance measurement error between bonding surfaces at the time of welding,
First and second clamps coupled to and fixed to the first and second pipes, respectively;
A measuring bar provided on at least one of the first and second clamps;
A distance measuring unit for measuring a moving distance by using an electrical signal generated in accordance with the movement of the measuring rod; And
An error correction unit coupled to one side of the distance measurement unit to adjust a relative position of the distance measurement unit with respect to the measurement rod to correct a difference between the distance measured by the distance measurement unit and the actual travel distance; / RTI >
Wherein the error correction unit comprises:
A correction bar having one end connected to one side of the distance measurement unit and formed to be elongated in the same direction as the movement direction of the measurement rod, the correction bar having a screw thread having a pitch of 0.1 mm to 1 mm on the outer surface;
A correction nut screwed into the correction rod; And
And a fixed support which is fitted in the correction bar and is disposed on at least one side of both sides of the correction nut and restricts the movement of the correction nut in a state where the correction is completed, A distance measurement error correction device. The method according to claim 1,
Wherein the error correction unit adjusts the relative position of the distance measurement unit with respect to the measurement rod in units of 0.1 mm to 1 mm as a unit. delete The method according to claim 1,
And a fixing nut screwed to the correction bar, the fixing nut being positioned on the opposite side of the correction nut with the fixing support interposed therebetween. Measuring error correction device. The method according to claim 1,
The correction bar may include:
A first correction bar coupled at one end to one side of the distance measurement unit and elongated in the same direction as the movement direction of the measurement rod; And
And a second correction bar linked to the first correction bar and coupled to the correction nut and the fixed support.
KR1020150061029A 2015-04-30 2015-04-30 Apparatus for correcting measurement error of distance between each joining objects in butt fusion of polyethylene pipes KR101650540B1 (en)

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KR1020150061029A KR101650540B1 (en) 2015-04-30 2015-04-30 Apparatus for correcting measurement error of distance between each joining objects in butt fusion of polyethylene pipes

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200098463A (en) * 2020-08-12 2020-08-20 한영훈 3Dprinting output component splicing device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08215847A (en) * 1995-02-14 1996-08-27 Sekisui Chem Co Ltd Control method of welding robot
KR0130947B1 (en) * 1994-04-29 1998-04-13 문수창 Auto-welding apparatus for plastic pipe
KR20010047858A (en) * 1999-11-23 2001-06-15 오동찬 Automatic welding device and method for controlling the same
JP2001162898A (en) 1999-12-14 2001-06-19 Casio Comput Co Ltd Printer and method for printing
US20060032349A1 (en) 2002-03-08 2006-02-16 Pe Fusion, Llc Beveled cutter
US8128853B2 (en) 2003-06-13 2012-03-06 Underground Solutions Technologies Group, Inc. Fusion process for conduit
KR20140021440A (en) * 2012-08-10 2014-02-20 삼성중공업 주식회사 Pipe cutting and beveling apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0130947B1 (en) * 1994-04-29 1998-04-13 문수창 Auto-welding apparatus for plastic pipe
JPH08215847A (en) * 1995-02-14 1996-08-27 Sekisui Chem Co Ltd Control method of welding robot
KR20010047858A (en) * 1999-11-23 2001-06-15 오동찬 Automatic welding device and method for controlling the same
JP2001162898A (en) 1999-12-14 2001-06-19 Casio Comput Co Ltd Printer and method for printing
US20060032349A1 (en) 2002-03-08 2006-02-16 Pe Fusion, Llc Beveled cutter
US8128853B2 (en) 2003-06-13 2012-03-06 Underground Solutions Technologies Group, Inc. Fusion process for conduit
KR20140021440A (en) * 2012-08-10 2014-02-20 삼성중공업 주식회사 Pipe cutting and beveling apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200098463A (en) * 2020-08-12 2020-08-20 한영훈 3Dprinting output component splicing device
KR102166161B1 (en) 2020-08-12 2020-10-15 한영훈 3Dprinting output component splicing device

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