KR20150045046A - Apparatus for expanding bore over full length of pipe - Google Patents

Abstract

This invention relates to an apparatus for expanding bore over full length of pipe, which comprises a working unit that supports a pipe subjected to expansion and calibrates bore measurement through pipe diameter expansion; a moving unit that moves the pipe on the working unit front and back to calibrate bore measurement through pipe diameter expansion; and a mounting unit to insert and fix the front end of a pipe at the boundary portion of the said working unit and moving unit. The said moving unit includes a chain that runs in the reverse direction of the pipe on the working unit; a removable carrier connected to the said chain to move along the chain; and a tie rod in predefined length that is placed at the front end of the said carrier and passes through the inside of the pipe via the said mounting unit to combine with an expansion plug at the end in a way that the tie rod can be removable.

Description

APPARATUS FOR EXPANDING BORE OVER FULL LENGTH OF PIPE

More particularly, the present invention relates to a pipe full-bore diameter expansion pipe system capable of ensuring an accurate inner diameter tolerance along with an inner diameter expansion.

In general, steel pipes used for inserting other parts among the mechanical structural steel pipes are not precisely fixed when the inner diameters are not precisely dimensioned, and they cause collision with the inside of the steel pipe, thereby causing the durability of the machine to deteriorate . Therefore, the manufacture of steel pipes for such use requires a guarantee of a precise inner diameter dimensional tolerance of +/- 0.1 mm or less.

However, since there is no adjustment process such as the contact of the fixture on the inside diameter of the pipe during the manufacturing process of the ERW which uses the multi-step roll to press the original rope on both sides to produce the circular shape, A variation in the inner diameter dimension may occur due to the thickness deviation.

Therefore, after a pipe is manufactured, it is subjected to a separate process for obtaining inner diameter dimensional tolerance such as drawing or expansion of a press, but the cost of the process itself is high, thereby increasing the price of the final product.

Fig. 1 illustrates a pipe inner diameter enlargement by a press as an example of a conventional pipe inner diameter enlarging technique.

The pipe inner diameter enlarging by press is performed by separately fixing the short pipes P ₁ , P ₂ , ... cut into the predetermined length of the steel pipe P and fixing the jig to the cut pipes P ₁ , P _2, ...) flaring _{(P '1, P' 2} , the inner diameter is moved in a manner to push in the direction to the bottom of the upper ...) it is how to.

However, since the process of fixing the short pipes P ₁ , P ₂ , ... to each other and moving them again after the press work is repeated, the process time is lengthened, and accordingly, The manufacturing cost is also increased.

Further, when the inner diameter of the pipes cut off is smaller than the tip of the jig due to the manufacturing method in which the pipe is pushed from the upper end to the lower end through the high-pressure press, there is a risk that the product is damaged in the process of expanding the pipe.

Fig. 2 illustrates pipe expansion by drawing as another example of the conventional pipe inner diameter enlarging technique.

The pipe inner diameter enlargement by drawing is a process for simultaneously reducing the outer diameter through the dies and enlarging the inner diameter by using a plug, and simultaneously correcting the dimensional tolerances of the outer diameter and the inner diameter.

For this purpose, the pipe P is moved in a state in which the die 10 and the plug 30 are fixed. In order to move the pipe P, the pipe end Pa is first pushed to the chuck 20, Pointing process' is preceded and then the chuck is pulled to pass the pipe through the dice. In this process, the outer diameter of the pipe is reduced by the die (10) and the inner diameter is expanded by the plug (30) to perform dimensional correction.

However, in the pipe inner diameter enlarging method by drawing, the pipe end is damaged due to the pointing process in which the pipe end is interlocked with the chuck in order to move the pipe, so that the pipe end is cut and discarded after the operation .

In the case of the steel pipe pipe, precise tolerance for the outer diameter is not required because the outer part is welded to other parts. However, since there is a part to be inserted in the inside, a precise inner diameter dimensional tolerance is required to be guaranteed. Recently, There is a need for a new process that replaces the press or draw-out method of high risk of damage or loss as described above.

The present invention has been developed in order to solve the above-described problems, and it is an object of the present invention to provide a pipe capable of performing an inner diameter enlarging operation once for a long uncut pipe, The purpose of this paper is to provide a pipe full length internal diameter expansion pipe system.

According to an aspect of the present invention, there is provided a piping system for a piping system, comprising: a working unit for receiving a pipe to be expanded and correcting an inner diameter dimension through pipe enlargement; And a mounting portion for fitting and fixing a front end portion of the pipe at a boundary portion between the working portion and the operating portion.

According to the present invention, the operating section includes: a chain that is driven in a backward direction with respect to the pipe on the work section; a carrier detachably connected to the chain and moving along the chain; And a support rod penetrating the inside of the pipe through the through hole and detachably connecting the diameter plug to an end thereof.

In addition, the present invention provides a method for expanding the pipe internal diameter by using the above apparatus, wherein the elevating arm is operated through the operation switch to push the lower ends of the waiting pipes to the stacking table so as to pass over the stopping jaw, ; Fixing the drawn pipe to the die of the mounting table and pushing the carrier against the installed pipe by pressing the first operating button under the die; The carrier is moved forward by the driving of the motor by the first operating button and the carrier is stopped when the front end of the mounting table is reached; The carrier reaches the starting point, the end of the support rod is partially exposed to the rear end of the pipe, and the diameter-limiting plug for expanding the inner diameter of the pipe is coupled to the end of the exposed support rod; Pressing the second operating button under the die to cause the carrier to move backward; A hook arm extending and supported at a front end of the cylinder is driven to rotate by a driving cylinder provided in the carrier to engage with the chain and the chain is driven in the reverse direction with respect to the pipe by driving the motor by the second operating button; The carrier moving backward along the chain and at the same time a diameter plug of a support rod end extending from one side of the carrier performing an expansion and inner diameter dimension correction along an inner diameter of the pipe; The carrier reaches the end point of the operating end and stops, and at the same time, the diameter-increasing plug at the end of the supporting rod passes through the pipe and is drawn out to the front of the mounting portion; And separating the diameter plug from the support rod and repeating the steps.

As described above, according to the present invention, since the inner diameter enlarging operation can be performed at a time on the long uncut pipe, the process of moving the product for the expanding operation is omitted, There is an advantage of shortening. In addition, since the contact between the jig and the inner diameter of the pipe is made by pulling the support rod in a state where the support rod and the jig, that is, the diameter plug, are engaged with each other at the pipe front end portion, there is no fear of defective product.

The present invention does not have a pointing process such as a conventional drawing process, so that there is no loss due to pipe end damage, and the inner diameter dimension can be corrected for the pipe length in a more cost effective manner. In addition, it is possible to reduce costs due to pipe manufacturing by replacing processes such as drawing or press expansion which are expensive.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory view of a press-type pipe inner diameter enlarging according to the prior art,
FIG. 2 is an explanatory drawing of a pipe inner diameter enlarging method of a drawing type according to the prior art,
FIG. 3 is a view showing a pipe full length inner diameter expanding pipe installation according to the present invention, a state of preparation for operation through forward movement of a carrier and installation of a pipe,
FIG. 4 is a schematic view of a pipe full length bore expanding apparatus according to the present invention, schematically showing a forward movement of a carrier according to FIG. 3;
FIG. 5 is a view showing a pipe full length bore expanding apparatus according to the present invention, in which the carrier is ready to be retracted for reaching a starting point of a carrier, passing a pipe at the end of a support rod, Fig.
6 is a view showing a pipe full length inner diameter expanding apparatus according to the present invention for performing a pipe full length inner diameter enlarging operation in accordance with the engagement of a diameter plug on the end of a support rod and the backward movement of the carrier,
FIG. 7 is a view showing a pipe supply in a loading table of a pipe full length bore expanding apparatus according to the present invention,
8 is a view showing a structure of a die and a coupling structure between pipes in a mounting portion of a pipe full length internal diameter expansion pipe installation according to the present invention,
Fig. 9 is a view showing a configuration and a coupling structure of a diameter-increasing plug coupled to an end of a support rod;
10 is a view showing a process of joining an end of a support rod and a diameter-increasing plug;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a schematic view of a pipe full length bore expanding apparatus according to the present invention. The pipe 100 includes a working unit 100 for receiving a pipe 101 to be expanded and correcting an inner diameter of the pipe 101, And an operation unit 200 for performing a forward and backward reciprocating operation with respect to the pipe 101 to be expanded for the purpose of correcting the inner diameter through the pipe. A mounting portion 300 for fitting and fixing the front end portion of the pipe 101 to be expanded is disposed at a boundary portion between the working portion 100 and the operating portion 200. A front surface of the mounting portion 300 is provided with, As shown in the drawing, a die 310 having a step 312 is disposed in the inside so that the front end of the pipe 101 to be expanded can be held in a locked state.

The work unit 100 has a die 110 of a predetermined length on which a pipe to be processed 101 is installed and a stacking table 120 on which a plurality of pipes are stacked on one side of the die, And a latching jaw (121), which prevents the loaded pipes from falling. A sliding bar 140 having a predetermined length for receiving the respective pipes drawn out from the stacking table 120 is extended in front of the latching jaws 121 to support the pipe 101 so that the operator can easily grasp the pipe.

An elevating arm 130 is provided below the inside of the latching jaw 121 and capable of vertically moving up and down separately from the loading table 120. The elevation of the elevating arm 130 is transmitted to the frontmost pipe 101 are pushed up and over the engaging jaws 121 so that the foremost pipe 101 is pulled out in a workable manner with the sliding bar 140 (see Fig. 7). This operation can be accomplished by operating the operation switch 170 attached to the front surface of the work part die 110. [

The operation unit 200 includes a chain 223 that is rotationally driven by predetermined connecting means 221 and V for connecting the first motor 220 and the sprocket 222. An upper portion of the chain 223 A carrier 210 which is movable in the forward and backward directions with respect to the pipe 101 is provided for expanding the pipe 101 that is placed on the working unit 100. A support rod 211 having a predetermined length to penetrate the pipe 101 to be expanded through the mounting part 300 and the die 310 is provided at the front end of the carrier 210. Preferably, Is formed thinner than the pipe (101).

The advance movement of the carrier 210 toward the pipe 101 to be expanded on the operation part 200 is performed by a predetermined connection means (for example, a " 231), and the backward movement of the carrier 210 is moved along the chain drive direction through the connection with the chain 223. In this process, the support rod 211 of the carrier 210 and the diameter-setting plug 400 coupled to the end of the pipe 210 pass through the entire length of the pipe 101 to be expanded, and the inner diameter of the pipe is expanded and corrected.

The carrier 210 includes an operating cylinder 212 rotatably extended from the body for connection with the chain 223 and a hook arm 213 rotatably extended from the front end of the cylinder. The carrier 210 is provided with a plurality of driving rolls 214 at the lower portion of the body 210 so that the carrier 210 can be moved forward by the second motor 230 and the rope 231.

It is preferable that the connection of the diameter-increasing plug 400 to the support rod 211 is detachable. For this purpose, the tip of the support rod 211 and the front end of the diameter-adjusting plug 400 are formed to have a latching structure (for example, a tip of the support rod 211 has a triangular projection structure and a front end of the diameter- (See Fig. 9B).

The diameter plug 400 may be provided in two parts as shown in FIG. 9A for convenience in use and fabrication. In this case, the joint member 410 is connected to the support rod 211, And a large diameter portion 420 having a large diameter portion 422. The connection structure of the joint member 410 and the enlarged diameter member 420 may be provided by a bolt fastening type 421 and the substantial diameter expansion of the pipe 101 by the diameter- And a large-diameter portion 422 of a large diameter. At this time, the inner diameter dimension of the pipe 101 is also corrected.

9A, when the diameter-increasing plug 400 is formed as two parts, the joint member 410 and the diameter-enlarging member 420 are first connected to each other, The triangular protrusion 211a of the support rod 211 is inserted into the triangular groove 411 of the joint member 410 and the joint member 410 is rotated and fastened as shown in FIG. At this time, the support rod 211 and the joint member 410 maintain the mutual engagement state.

3 to 6, pipe diameter inner diameter enlarging and inner diameter correction according to the present invention will be described.

When the operation switch 170 provided on the die 110 of the work unit 100 is pressed, the lifting arm 130 is lifted and the pipe 101 positioned at the foremost position on the loading table 120 is pushed up, Thereby allowing the foremost pipe 101 to be operably pulled out of the slider bar 140. [

When the operator puts the pipe 101 drawn out by the slide bar 140 and inserts the front end portion into the through hole of the die on the mounting portion, the front end portion of the pipe is held in the step 312 inside the die 310. In this state, when the first operation button 150 provided at the lower side of the die 110 is pressed, the second motor 230 is driven and the carrier is moved by the rope 231 to the pipe 101 to be expanded on the work unit 100 (See Figs. 3 and 4). The support rod 211 is inserted into the pipe 101 in accordance with the advancement of the carrier 210 and the carrier 210 automatically stops in front of the mounting portion 300. The carrier 210 can be stopped by installing a limit switch (not shown). When the carrier 210 reaches the front of the mounting portion 300, the support rod 211 passes through the pipe 101 and its end is drawn out of the pipe. In this state, the worker connects the diameter-setting plug 400 to the end 211a of the pipe 101 as shown in FIG.

When the diameter setting plug 400 is connected to the end of the pipe 101 and the second operation button 160 provided below the die 110 is pressed, the first motor 220 is driven, The chain 223 rotates in a direction opposite to the work unit 100. [ In addition, the operating cylinder 212 is extended and driven in the carrier 210, so that the hooking arm 213 at the front end of the cylinder 212 rotates to be engaged with the chain 223 (refer to FIG. 5) And moves backward along the chain 223 corresponding to the pipe 101 on the working unit 100 (see FIG. 6). Here, although the first operation button 150 and the second operation button 160 are illustrated as separate elements in the drawing together with the operation switch 170, they may be integrated into one control means Of course.

The carrier 210 moving backward along the chain 223 is automatically stopped and stopped at the end of the operating part 200. [ The stopping of the carrier 210 is realized by installing a limit switch (not shown). The operating cylinder 212 of the carrier 210 is retracted and driven so that the hooking arm 213 at the front end of the cylinder 212 is rotated and returned to the end of the chain 210 while the carrier 210 reaches the end of the operating portion 200. Thus, The latching state is released from the latching portion 223. In this state, the support rod 211 is pulled out of the mounting portion 300 through the pipe 101 in a state where the diameter-increasing plug is engaged with the end of the support rod 211. In this process, the inner diameter of the pipe 101 is enlarged, Is corrected. The operator removes the diameter-reducing plug 400 from the end 211a of the support rod 211 drawn out of the mounting portion 300. [

The pipe length internal diameter expanding apparatus of the present invention described above can be applied to a mechanical part (for example, a combined part is inserted in the inside and a part is welded to the outside part) where the maintenance of the inside diameter tolerance is more important than the correction for the outside diameter This is possible.

100:
101: pipe to be expanded
110: die
120: Stacking table
121: hanging jaw
130; Lift arm
140: Sliding bar
150,160: Operation button
170: Operation switch
200:
210: Carrier
211:
211a: the tip of the support rod
212: Operation cylinder
213: Hanging arm
214: driving roll
220, 230:
222: Sprocket
223: Chain
231: Rope
300:
310: Dice
312:
400: diameter plug
411: Front of the diameter plug
410: joint member
422:
420:
V: drive belt

Claims (10)

An operation part for receiving the pipe to be expanded and for correcting the inner diameter dimension through pipe enlargement, an operation part for performing a back and forth reciprocating motion with respect to the pipe on the operation part to perform the inner diameter dimension correction through pipe enlargement, And a mounting portion for fitting and fixing a front end portion of the pipe at a boundary portion between the operating portion and the operating portion,
The operating portion includes a chain that is driven to move backward with respect to the pipe on the working portion, a carrier detachably connected to the chain and moving along the chain, and a carrier provided at a front end of the carrier, And a support rod having a predetermined length through which a diameter plug is detachably coupled to an end thereof. The method according to claim 1,
Wherein the carrier is connected to the motor through a predetermined connecting means that is driven in a direction to advance with respect to the pipe on the working portion and moves forward. The method according to claim 1,
The carrier includes a working cylinder rotatably extended and supported from the body for connection with the chain, a hook arm rotatably extended and supported from the front end of the cylinder, and a plurality of And a drive roll is provided. The method according to claim 1,
Wherein the support rod is elongated and thinner than the pipe to be expanded, wherein an end of the support rod and a front end of the diameter plug are provided in a mutually engageable structure having the same shape. The method according to claim 1,
Wherein the diameter plug is composed of a joint member connected to the support rod and a diameter-enlarged portion having a large diameter portion for expanding the pipe, and the joint member and the diameter-enlarged portion are detachably connected to each other. The method according to claim 1,
Wherein the mounting portion includes a die having an inner step so that a front end of the pipe to be expanded can be held in a latching state. The method according to claim 1,
The work unit includes a die having a predetermined length on which a pipe to be processed is installed, and a stacking table on which a plurality of pipes are stacked on one side of the die. The stacking platform is formed of a front jaw to prevent falling of the stacked pipes Pipe length bore length expansion pipe system. 8. The method of claim 7,
Wherein a sliding bar of a predetermined length is extended in front of the latching jaw so as to receive the respective pipes drawn out from the loading area. 9. The method of claim 8,
A lifting arm capable of lifting and lowering up and down independently from the loading table is provided on the inner lower side of the holding jaw, and the frontmost pipe of the loading table is pushed up by the elevation of the lifting arm, And the pipe length bore length expansion pipe system. A pipe full length inner diameter enlarging method through the expansion pipe set forth in any one of claims 1 to 9,
Moving the lift arm through the operation switch to push the lower ends of the waiting pipes to the stacking table so that they pass over the stopping jaws and are pulled out of the slides;
Fixing the drawn pipe to the die of the mounting table and pushing the carrier against the installed pipe by pressing the first operating button under the die;
The carrier is moved forward by the driving of the motor by the first operating button and the carrier is stopped when the front end of the mounting table is reached;
The carrier reaches the starting point, the end of the support rod is partially exposed to the rear end of the pipe, and the diameter-limiting plug for expanding the inner diameter of the pipe is coupled to the end of the exposed support rod;
Pressing the second operating button under the die to cause the carrier to move backward;
A hook arm extending and supported at a front end of the cylinder is driven to rotate by a driving cylinder provided in the carrier to engage with the chain and the chain is driven in the reverse direction with respect to the pipe by driving the motor by the second operating button;
The carrier moving backward along the chain and at the same time a diameter plug of a support rod end extending from one side of the carrier performing an expansion and inner diameter dimension correction along an inner diameter of the pipe;
The carrier reaches the end point of the operating end and stops, and at the same time, the diameter-increasing plug at the end of the supporting rod passes through the pipe and is drawn out to the front of the mounting portion; And
Separating the diameter plug from the support bar and repeating the steps.

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