KR101567848B1

KR101567848B1 - Thermal strain prevention appratus when welding metallic pipe

Info

Publication number: KR101567848B1
Application number: KR1020140081016A
Authority: KR
Inventors: 임동욱; 나경수
Original assignee: 한국씨티에스주식회사
Priority date: 2014-06-30
Filing date: 2014-06-30
Publication date: 2015-11-11

Abstract

The present invention relates to a thermal strain preventing apparatus during welding of a metallic pipe which comprises: a base plate (110) with a sliding groove formed on the side; a bundle guide (120) erected on the base plate; a top plate (130) combined with the top end of the bundle guide with a bar hole formed in the center; a screw bar (140) inserted through the bar hole of the top plate, which has a handle on one side to be rotated within the bar hole when the handle is rotated in a normal direction and a reverse direction; a variable bundle (150) combined with the screw bar with a screw, which has multiple pin openings with a pinhole formed on the outer circumference and which is located in between the base plate and the top plate to be elevated when the screw bar is rotated in the normal direction and to be lowered when the screw bar is rotated in the reverse direction; a contact plate (170) connected to the pin openings of the variable bundle through a plate link (160), which is moved into the inside with a hinge pin as the axis reducing the diameter when the variable bundle rises and which is moved to the outside extending the diameter when the variable bundle falls; and a sliding piece (172) protruding to the inside at the bottom of the contact plate and inserted into the sliding groove of the base plate to guide the contact plate not to move up and down but to move only to the sides when the variable bundle rises and falls.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus for preventing thermal deformation of a steel pipe during welding,

More particularly, the present invention relates to an apparatus for preventing thermal deformation of a steel pipe during welding, which prevents deformation of a steel pipe by welding heat when two steel pipes are welded to each other.

Roads are equipped with traffic light holding devices to effectively control traffic flow. As shown in FIG. 1, the traffic light holding device is installed at a crossing or a crossing, and a supporting bar is installed on a road side, and a crossbeam extending toward the road is formed at the upper end of the pillar. A plurality of signal lamps, do.

It is made up of a steel pipe with a supporting and a horizontal line. If the width of the road is wide, it should be extended long enough to fit there. In other words, the length of the side can be shortened to several meters, but it should be made as long as tens of meters.

It is expensive to move to the installation site when the crossbar is long, since it needs to be moved by the car looking in the landscape and then the tower should be installed and formed on it. Therefore, when connecting to the tower, Therefore, the installation cost is high. Especially, it is difficult to lift the vehicle to 20 meters or more in the horizontal direction. Therefore, there is a separate trailer and heavy weight, which causes traffic congestion and causes of accidents while moving to the installation site.

Recently, in view of such a problem, as shown in Fig. 1, there is used a method in which a horizontal length of steel pipe of a certain length or more is divided into a plurality of unit lengths and is welded at the installation site.

When a steel pipe divided by a unit length is welded, a connecting pipe is inserted between a steel pipe and a steel pipe. One of the steel pipe is welded to one side of the connecting pipe, and a male screw is formed on the other side of the connecting pipe. A female screw is formed on the inner surface of the housing and is coupled by a bolt / nut method. That is, the male thread is formed on the outer periphery of one side with respect to the center of the connecting pipe, and the other side where the male thread is not formed is inserted into the inside of the steel pipe to weld the end portion of the steel pipe and the connecting pipe so as to be integrated with the steel pipe. The male thread on the outer periphery of the connector is formed in advance when the connector is manufactured, and the female thread corresponding to the male thread is formed on the inner surface of the steel pipe to which the connector is attached.

When the joint pipe is welded to the steel pipe and welded, the outer diameter is reduced because the joint pipe is thermally deformed by the heat of the weld. When the outer diameter of the connecting pipe is reduced, the shape of the male thread formed on the outer periphery of the connecting tube is finely deformed. When connecting the other steel pipe formed with the female screw in a bolt / nut manner, the female thread and the male thread do not fit each other, It also becomes impossible to connect.

In order to solve this problem, it is possible to insert another member in the form of a concentric circle fitting into the inner diameter of the connecting pipe so that the outer diameter of the connecting pipe is not reduced when the steel pipe and the connecting pipe are welded. However, since there is no clearance, It is hard to use this method in actual field because it is difficult to remove after welding. Therefore, there are various advantages such as the ease of moving and the reduction of the installation cost by dividing the beam into unit lengths and connecting them at the installation site. However, there are cases where it is necessary to repeat the connection operation twice or more due to the deformation of the connection pipe occurring during welding, It is time-consuming to install the signal lamp holding device and the cost increase, thereby hindering the productivity improvement.

Korean Patent No. 10-1103563 Korean Patent No. 10-1029039 Korean Patent No. 10-1058878 Korean Patent No. 10-1113137

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, And to provide a device for preventing thermal deformation of a steel pipe during welding which can be repeatedly used.

In order to achieve the above-mentioned object, the present invention provides a sliding device, comprising: a base plate 110 having a sliding groove formed on a side thereof; a bundle guide 120 installed on the base plate; an upper plate 130 coupled to the bundle guide, A screw bar 140 that is rotated in the bar when the handle is rotated in the normal direction, a number of pin holes that are screwed to the screw bar and have a pin hole formed on the outer periphery thereof, A variable bundle 150 that is positioned between the upper plates and ascends when the screw bar rotates in a forward direction and is lowered when the screw bar rotates in a reverse direction, a hinge pin 150 connected to the pin of the variable bundle through a plate link 160, (170) which is moved inwardly in the axial direction to reduce its diameter, and moves downward to expand its diameter, and an inner side And the sliding piece 172 is inserted into the sliding groove of the bottom plate so as to guide the closing plate to the left and right without moving up and down when the bottom plate moves up and down. A thermal deformation prevention device is provided.

In addition, the fin spheres formed in the variable bundle are formed in two rows in the upper and lower rows, and the plate links formed in the upper and lower rows of the pin assembly are formed in two rows, and the plate links connecting the variable bundle and the fastening plate are also connected to the pin holes in the two rows Wherein the plate link connecting the variable bundle and the adhesive plate is coupled to both side surfaces of the pin sphere of the variable bundle and the pin sphere of the adhesive plate to increase the structural strength, And a bar receiving groove is formed so that the screw bar can be held without being moved in a horizontal direction when the screw bar is rotated by supporting the end of the screw bar.

According to the present invention, a connecting tube, which is a structural medium between steel pipes, is welded when another steel pipe is joined to a steel pipe constituting a cross beam. In this case, the device is positioned inside the connecting pipe to be welded and the handle So that the deformation of the connecting pipe, particularly, the deformation of the threaded portion is prevented by the welding heat, thereby facilitating the following steel pipe clamping operation. In addition, welding work is performed without worrying about thermal deformation by preventing deformation caused by welding heat, so workability is improved, and an untrained worker can perform welding work.

1 shows a typical signal lamp holding device.
2 is an assembled perspective view of the device according to the invention.
3 is an exploded perspective view of the device according to the invention.
4 is a perspective view of the main part of the apparatus according to the present invention before the fastening plate is expanded.
Fig. 5 is a sectional view of a main portion of a state before the fastening plate of the device according to the present invention is extended.
FIG. 6 is a perspective view of the main part of the apparatus according to the present invention in a state in which the contact plate is extended. FIG.
Fig. 7 is a sectional view of the main part in a state in which the contact plate of the device according to the present invention is extended.
8 is a conceptual diagram showing a state before the device according to the present invention is mounted inside the connection pipe.
Fig. 9 is a conceptual diagram of a state in which the device according to the present invention is positioned inside the connection pipe and the adherend is expanded.
10 is a conceptual diagram of a state in which the device according to the present invention is positioned inside the connection pipe and the handle is rotated to cause the fastening plate to expand and closely contact the inner wall of the connection pipe.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 and 3, the bottom plate 110 is provided, and three sliding grooves 112 are formed on the outer circumference at intervals of 120 degrees with respect to the center point. The sliding groove is formed on the bottom surface of the bottom plate in the center direction of the bottom plate, and the front side is opened. In the center of the bottom plate, there is formed a bar receiving groove 114 in which the end of the screw bar is supported so as to prevent the horizontal movement of the screw bar described later.

In the base plate 10, three bundle guides 120 are formed at intervals of 120 degrees with respect to the center point of the base plate, and a space formed by three bundle guides is formed. As shown in Fig.

An upper plate 130 having a bolt hole bh is fitted to the upper end of the bottom plate 110 to correspond to the bundle guide 120 and the upper plate 130 is integrally coupled to the bundle guide. A barb 132 is formed in the center of the upper plate 130.

In the space between the three bundle guides 120, a variable bundle 150 is inserted which is caught by the bundle guide 120 and can not move horizontally but can only move up and down. A bar fastening hole 152 is formed through the center of the variable bundle 150 and formed with a thread on the inner wall.

A screw bar 140 having a handle 142 at an end thereof is inserted into the barrel 132 of the upper plate 130. The screw bar 140 passes through the barrel 132 and is coupled to the bar fixing hole 152 of the variable bundle 150 positioned between the bundle guides 120. When the screw bar 140 is rotated clockwise, The variable bundle 150 is lowered when the variable bundle 150 coupled with the nut type is lifted up and rotated counterclockwise.

Three pin holes pf protruding at intervals of 120 degrees with respect to the center point are formed on the outer periphery of the variable bundle 150. The pin slots are positioned between the bundle guide 120 and the bundle guide 120, So that it can not move in the horizontal direction. The pin holes pf may be formed in two rows in the up and down direction, and may be formed in three rows. However, since interference may occur during operation, it is preferable that the pin holes pf are formed in two rows. A pin hole (ph) is formed in each of the pin holes pf.

The three closure plates 170 are coupled to the variable bundle 150 at intervals of 120 DEG with respect to the center point so as to form one circle. The outer peripheral surface of the tightening plate 170 is rounded in consideration of the curvature of the coupling tube. The variable bundle 150 and each of the adhered plates 170 are connected to each other through a plate link 160. One end of a pair of plate links 160 having a pin hole formed at both ends thereof is inserted into a pin hole the plate link 160 can freely rotate up and down about the hinge pin by inserting a hinge pin into the pin hole formed in the pin hole pf. The other end of the plate link 160 is inserted into a pin hole ph of a pin hole pf formed on the inner side of the contact plate 170 to insert a hinge pin, So that it can freely rotate up and down. The connection between the plate link 160 and the mask bundle 150 and the connection between the plate link 160 and the adhesive plate 170 can be freely rotated up and down by a hinge pin.

The plate link 160 may be formed in two rows in the upper and lower rows in the variable bundle. The plate link 160 may be formed in the same manner as the pin plate 160 formed on the upper portion of the variable bundle 150, A pin hole is formed so as to correspond to the pin hole formed in the upper portion of the plate link 160, and the plate link 160 is coupled using the hinge pin in the same manner. Since the two plate links 160 are to be interlocked with each other, they must be prevented from interfering with operation.

The width of the fastening plate 170 is set so that when the three opposite end portions of the fastening plate 170 are brought into contact with each other, the diameter of the fastening plate 170 is changed by the length of the plate link 160 . For example, if the length of the plate link is 5 cm and the tilting angle is 0 to 90 °, the diameter can be changed by about 7 to 8 cm because the tilting angle of the plate link is extended even considering the installation angle of 120 ° between the three contact plates. That is, when the tightening plates 170 are brought into contact with each other and the screw bar 140 is turned, the diameter becomes about 7 to 8 cm larger. Since the diameter change of the connecting plate by the contact plate means that the diameter difference of the connecting pipe can be applied in the range of about 7 to 8 cm, the diameter variation of the contact plate is designed to be larger or smaller . The outer surface of the tightening plate 170 may be coated using a refractory material having excellent frictional force so that it does not slip when it is in close contact with the connection pipe.

A sliding piece 172 protruding toward the center of the bottom plate 110 and inserted into the sliding groove 112 and moving back and forth along the sliding groove is formed at the lower end of each of the contact plates 170.

The operation of the apparatus for preventing thermal deformation of a steel pipe during welding according to the present invention will be described below.

As shown in Figs. 8, 9, and 10, before the welding portion of the connecting pipe that joins the connecting pipe to the steel pipe and welds the end portion of the steel pipe is abutted against each other, the total diameter of the closing plate formed by the closing plate is larger than the inside diameter With the connector in the smallest position, push the device into the area to be welded.

When the apparatus is rotated in the counterclockwise direction with the connecting tube in a position to be welded as shown in FIGS. 4 and 5, the threaded coupling tool 150 is rotated together, but the pin hole pf It is caught by the bundle guide 120 and can not be rotated and moves down along the screw bar 140 in proportion to the amount of rotation of the screw bar. When the variable bundle 150 is lowered, the plate link 160 connected to the pin port pf is rotated around the hinge pin to be angled as shown in Figs. 6 and 7, The sliding piece 172 formed on the contact plate 170 is caught in the sliding groove 112 and can not move up and down so that the angle of the plate link 160 The sliding piece 172 moves horizontally along the sliding groove 112. The sliding piece 172 moves in the horizontal direction. That is, the diameter of the fastening plate 170 is expanded by the horizontal movement distance. When the screw bar 140 is rotated, the fastening plate 170 is extended and tightly contacted with the inner wall of the connection pipe.

When the welded plate 170 is welded to the inner wall of the connecting pipe, the welded plate is pressurized even if the welded heat is transferred to the thread of the connecting pipe, so that the diameter of the welded plate is not reduced.

When the handle 142 is turned clockwise in the state of FIGS. 6 and 7, the screw is coupled with the screw bar 140 and the rotation is restricted by the bundle guide 120. Therefore, (150) rises. When the variable bundle 150 rises, the angle at which the plate link 160 is pulled up by the hinge pin is narrowed as shown in FIGS. 4 and 5, and the contact plate 160, which is connected to the plate link 160, The lift is restricted by the sliding piece 112 and the diameter of the contact plate 170 is reduced by moving along the sliding piece 112 in the horizontal direction (inward) by the narrowing angle of the plate link 160. [

When the diameter of the three adhesive plates 170 is reduced, when the adhesive plate 170, which has been pressed against the connection pipe, is separated and a part of the device such as the handle 142 or the screw bar 140 is pulled out, do.

In this way, when connecting other steel pipes to the steel pipe and extending the length, the connecting pipe which is a structural medium between the steel pipes is welded. In this case, the device is placed inside the connection pipe to be welded, So that the deformation of the connecting pipe, particularly the deformation of the threaded portion, is prevented by the welding heat, thereby facilitating the subsequent steel pipe clamping operation. In addition, welding work is performed without worrying about thermal deformation by preventing deformation due to welding heat, and workability is improved because skilled workers can perform welding work.

110: Base plate 112: Sliding groove
114: bar seating groove 120: bundle guide
130: top plate 132: barge
140: screw bar 142: handle
150: variable bundle 152: bar fastening ball
160: plate link 170: close plate
172: Sliding piece
pf: pin hole ph: pin hole
bh: bolt hole pin: hinge pin

Claims

A bottom plate 110 having three sliding grooves formed at intervals of 120 degrees on its side surfaces;
Three bundle guides (120) standing at 120 [deg.] Intervals on the bottom plate;
An upper plate 130 coupled to the upper end of the bundle guide and having a bar hole at its center;
A screw bar 140 inserted through the bar top of the upper plate and formed with a handle at one side thereof and rotated in the bar when the handle is rotated in the normal direction;
A plurality of pin holes formed on the outer circumference of the screw bar and disposed between the bottom plate and the top plate so that the screw bar is raised when the screw bar is rotated in the forward direction and is lowered when the screw bar is rotated in the reverse direction, A variable bundle 150 which is held in a horizontal direction and can be moved up and down without moving in a horizontal direction;
A fastening plate 170 connected to the pin of the variable bundle through a plate link 160 to move the hinge pin inward to reduce the diameter of the variable bundle when the variable bundle rises;
And a sliding piece 172 that protrudes inwardly from a lower portion of the close plate and is inserted into a sliding groove of the bottom plate to guide the close plate to the left and right without moving up and down when the press plate is lifted up
Wherein the steel pipe is made of steel.

The method of claim 1,
The fin spheres formed in the variable bundle are formed in two rows in the vertical direction and the plate links formed in the upper and lower rows of the pin assembly are formed in two rows and the plate links connecting the variable bundle and the fastening plate are also connected to the pin holes in the two rows Wherein the steel pipe is a steel pipe.

The method according to claim 1,
Wherein the plate link connecting the variable bundle and the adhesive plate is coupled to both side surfaces of the pin sphere of the variable bundle and the pin sphere of the adhesive plate to increase the structural strength.

The method according to claim 1,
And a bar receiving groove is formed at the center of the close plate so that the screw bar can be held without being moved in a horizontal direction when the screw bar is rotated by supporting the end of the screw bar.