PE pipe drawing device and pipe drawing process

Abstract

The invention discloses a PE pipe drawing device and a pipe drawing process, and relates to the technical field of PE pipe drawing, the PE pipe drawing device comprises a sleeve and a pipe expanding plug, the sleeve is arranged on a PE pipe in a sleeving mode, the PE pipe penetrates out of the sleeve and is arranged on the pipe expanding plug in a sleeving mode, and the pipe expanding plug is in a circular truncated cone shape which is convenient for tightly extruding the PE pipe on the inner wall of the sleeve; the casing pipe and the pipe expanding plug are fixed through a tensioning mechanism, and a pipe pulling jack is arranged between the casing pipe and the steel pipe. The method has the advantages that construction difficulty is lowered, and construction efficiency is improved; for special pipe sections, the PE flanging technology is eliminated, the PE flange welding technology can also be used, and the pipeline operation risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of PE pipe extraction, and particularly to a PE pipe extractor and an extraction process. Background Art

[0002] When lining the PE pipe by reducing its diameter, it is necessary to reduce the diameter of the PE pipe through a reducing machine, then line it into the original pipeline, and then achieve close contact with the original pipeline through the automatic recovery performance of the PE pipe.

[0003] Each lining section needs to be connected in the form of a combined flange of a steel flange and a PE flange. When welding the PE flange, it is necessary to wait for the lining PE pipe to fully recover, then stretch the PE pipe, calculate the retraction size for welding the PE flange, and then weld the PE flange to achieve the perfect fit effect of the PE flange and the steel flange.

[0004] The current technology uses an extrusion clamp to fix the extractor, which can only be used for long lining pipelines or in the case of relatively small extraction force. In the case where short pipes cannot be extracted, the prior art adopts the operation of making flanged flanges.

[0005] Disadvantages of the prior art:

[0006] (1) The current pipe extraction fixing method is prone to slippage when the pipe extraction force increases, resulting in pipe extraction failure, and the operation is cumbersome, requiring continuous tightening of bolts;

[0007] (2) With the continuous change of construction scenarios, there are many individual elbows and short sections that need to be reduced in diameter and lined, and welded with PE flanges. Due to the shortening of the lining section, the pipe extraction force increases sharply, and the traditional fixing method cannot meet the construction requirements;

[0008] (3) With the development of construction technology and the increasing improvement of lining construction standards, the process of making flanged flanges has been disapproved and will be phased out. Summary of the Invention

[0009] The purpose of the present invention is to provide a PE pipe extractor and an extraction process to solve the above problems. By using an inner plug type extractor, even when the force reaches the tensile limit of the PE pipe, the extractor will not slip.

[0010] The present invention achieves the above purpose through the following technical solutions:

[0011] A PE pipe extractor includes a sleeve and an expansion plug. The sleeve is sleeved on the PE pipe, and the PE pipe passes through the sleeve and is sleeved on the expansion plug. The outer shape of the expansion plug is a frustum of a cone that is convenient for squeezing the PE pipe against the inner wall of the sleeve. The sleeve and the expansion plug are fixed by a tensioning mechanism, and a pipe extraction jack is arranged between the sleeve and the steel pipe.

[0012] Preferably, the tensioning mechanism includes a stud and a nut.

[0013] Preferably, a first flange is provided at one end of the sleeve away from the steel pipe, a second flange is provided at one end of the expansion plug away from the steel pipe, the stud passes through the first flange and the second flange, and nuts for tensioning the first flange and the second flange are sleeved at both ends of the stud.

[0014] Preferably, a third flange is provided on the steel pipe, and the pipe pulling jack is arranged between the third flange and the first flange.

[0015] A PE pipe pulling process uses the above-mentioned PE pipe pulling device, and specifically includes the following steps:

[0016] Step S1: After the PE pipe is reduced in diameter and lined, leave a certain length of the PE pipe.

[0017] Step S2: Let the lined PE pipe fully retract to reach the state before diameter reduction.

[0018] Step S3: Sleeve the sleeve of the pipe pulling device on the PE pipe at the outlet.

[0019] Step S4: Insert the matching expansion plug into the PE pipe from the pipe orifice.

[0020] Step S5: Squeeze the expansion plug into the pipe pulling device through the tensioning mechanism to expand the port of the PE pipe to form a "bell mouth", and make the PE pipe squeeze between the outer wall of the expansion plug and the inner wall of the sleeve.

[0021] Step S6: Drive the pipe pulling jack to extend to stretch the lined pipe.

[0022] Step S7: After the PE pipe is stretched in place, fix the stretched PE pipe.

[0023] Step S8: Remove the pipe pulling device and perform subsequent construction operations such as PE flange welding.

[0024] Preferably, in the step S7, the PE pipe is fixed by placing a jack inside the PE pipe and extending it to make the PE pipe abut against the inner wall of the steel pipe to achieve the fixation of the PE pipe.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. Significantly improve construction efficiency: The internal plug-type pipe extractor adopted in the present invention makes the fixation of the PE pipe more stable and efficient during the pipe extraction process through the tight fit between the expansion plug and the casing and the unique design of the tensioning mechanism; compared with the traditional extrusion fixture fixation method, there is no need to repeatedly tighten bolts, greatly reducing the operation steps and time consumption during construction;

[0027] 2. Reduce construction difficulty and risk: In the face of a large pipe extraction force, the traditional pipe extraction and fixation method is prone to slippage, resulting in pipe extraction failure, which not only increases the uncertainty of construction but also may damage the pipeline and construction equipment. However, through the unique structural design of the present invention, this problem is effectively avoided. The frustum-shaped outer shape of the expansion plug can, under the action of the tensioning mechanism, tightly squeeze the PE pipe between the outer wall of the expansion plug and the inner wall of the casing, forming a strong frictional force and extrusion force. Even when reaching the tensile limit force of the PE pipe, the pipe extractor will not slip, greatly improving the reliability and safety of construction;

[0028] 3. Adapt to complex construction scenarios: With the diversification of construction scenarios, the demand for reducing the diameter of linings and welding PE flanges for single elbows and short sections is gradually increasing. When facing these special pipe sections, the traditional fixation method cannot meet the construction requirements due to the sharp increase in pipe extraction force caused by the shortening of the lining section. The pipe extractor and process of the present invention can well address this challenge. Whether it is a long lining pipeline or special short pipes and elbows, efficient pipe extraction and PE flange welding operations can be achieved; for special pipe sections, the gradually unrecognized PE flanging technology is eliminated, and the welding PE flange technology is adopted, which not only ensures the quality of pipeline connection but also reduces the pipeline operation risk and improves the overall reliability and stability of the pipeline system, providing a practical solution for various complex construction scenarios;

[0029] 4. Apply to a wider range of PE pipe sizes: The traditional fixture form for fixing PE pipes requires customization of various sizes for one-to-one use, while the present application meets the expansion fixation of pipe diameters within a certain range through the shape of the expansion plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a schematic internal structure diagram of a PE pipe extractor described in the present invention.

[0032] The reference numerals are explained as follows:

[0033] 1. Casing; 11. First flange; 2. Tube expanding plug; 21. Second flange; 3. Tensile bolt; 4. Tube pulling jack; 5. Steel pipe; 51. Third flange; 6. PE pipe. Detailed implementation mode

[0034] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0036] The present invention will be further described below with reference to the drawings:

[0037] Embodiment 1

[0038] As Figure 1 shown, a PE pipe pulling device includes a casing 1 and a tube expanding plug 2. The casing 1 is sleeved on the PE pipe 6, and the PE pipe 6 passes through the casing 1 and is sleeved on the tube expanding plug 2. The outer shape of the tube expanding plug 2 is a frustum of a cone that is convenient for squeezing the PE pipe 6 against the inner wall of the casing 1; the casing 1 and the tube expanding plug 2 are fixed by a tensioning mechanism, and a tube pulling jack 4 is arranged between the casing 1 and the steel pipe 5.

[0039] The tensioning mechanism includes a stud and a nut; a first flange 11 is provided at one end of the sleeve 1 away from the steel pipe 5, and a second flange 21 is provided at one end of the expansion plug 2 away from the steel pipe 5. The stud passes through the first flange 11 and the second flange 21, and nuts for tensioning the first flange 11 and the second flange 21 are sleeved at both ends of the stud; a third flange 51 is provided on the steel pipe 5, and the pipe extraction jack 4 is arranged between the third flange 51 and the first flange 11.

[0040] In addition, this embodiment also provides a PE pipe extraction process, which uses the above-mentioned PE pipe extractor, and specifically includes the following steps:

[0041] Step S1: After the PE pipe 6 is reduced in diameter and lined, leave a certain length of the PE pipe 6 (the length of the PE pipe left is 1 meter from the steel pipe). This step reserves a suitable operating space for the subsequent pipe extraction operation, ensures that the PE pipe 6 has enough length for stretching and other operations, and avoids the inability to effectively perform pipe extraction and subsequent flange welding construction due to the too short length of the PE pipe 6.

[0042] Step S2: Let the lined PE pipe 6 fully retract to reach the state before diameter reduction. This utilizes the elastic recovery performance of the PE pipe 6 to restore the PE pipe 6 to its original pipe diameter state, prepares for accurately stretching to a suitable length for flange welding subsequently, ensures that the welded PE flange and steel flange can be closely fitted, and improves the connection quality.

[0043] Step S3: Sleeve the sleeve 1 of the pipe extractor on the PE pipe 6 at the outlet. This provides a basic support structure for subsequent fixing of the PE pipe 6 and stretching operation, enabling components such as the expansion plug 2 and the tensioning mechanism to act effectively on the PE pipe 6.

[0044] Step S4: Insert the matching expansion plug 2 into the PE pipe 6 from the pipe orifice. The frustum shape design of the expansion plug 2 is crucial. After insertion, it can cooperate with the tensioning mechanism to expand the port of the PE pipe 6.

[0045] Step S5: Squeeze the expansion plug into the pipe extractor through the tensioning mechanism, so that the port of the PE pipe 6 expands to form a "bell mouth", and the PE pipe 6 is squeezed between the outer wall of the expansion plug 2 and the inner wall of the sleeve 1. The stud and nut of the tensioning mechanism cooperate to squeeze the expansion plug 2 into the sleeve 1. The frustum-shaped outer wall of the expansion plug 2 forces the port of the PE pipe 6 to expand outwards and tightly squeeze between the expansion plug 2 and the sleeve 1. This internal plugging type of fixing method, using the special shape and squeezing effect of the expansion plug 2, enables the PE pipe 6 to be tightly connected to the pipe extractor and is not likely to slip even under a large pipe extraction force. Compared with the traditional extrusion fixture fixing method, it greatly improves the reliability of fixing, effectively solves the problem that the traditional fixing method is prone to slipping when the pipe extraction force increases, and reduces the construction risk.

[0046] Step S6: Drive the pipe extraction jack 4 to extend and stretch the inner liner pipe. The pipe extraction jack 4 provides a stable and controllable pulling force to stretch the PE pipe 6 according to the dimensions required for construction, ensuring accurate stretching length and meeting the retraction size requirements for PE flange welding, creating favorable conditions for subsequent welding work, ensuring perfect fitting of the welded PE flange and steel flange, and improving the sealing and stability of the pipeline connection.

[0047] Step S7: After the PE pipe 6 is stretched in place, fix the stretched PE pipe 6. Place a jack inside the PE pipe 6 and extend it to make the PE pipe 6 abut against the inner wall of the steel pipe 5, realizing the fixation of the PE pipe 6. This fixation method is simple and effective, using the jacking force of the jack to firmly fix the PE pipe 6 inside the steel pipe 5, preventing the PE pipe 6 from shifting when the pipe extractor is removed and during subsequent construction operations, and ensuring the accuracy and stability of construction.

[0048] Step S8: Remove the pipe extractor and perform subsequent construction operations such as PE flange welding. At this time, the PE pipe 6 has been stretched and fixed in place. After removing the pipe extractor, PE flange welding can be directly carried out. Since the previous operations have ensured the accurate position and stretching dimensions of the PE pipe 6, it can effectively improve the welding quality, reduce welding defects, eliminate the traditional process of making flanged flanges, reduce the pipeline operation risk, simplify the construction process, and improve the construction efficiency.

[0049] Embodiment 2

[0050] The difference between this embodiment and Embodiment 1 is that a hydraulic cylinder is provided between the first flange 11 and the second flange 21, and the hydraulic cylinder contracts to complete the squeezing and fixing of the expansion plug 2 and the sleeve 1 on the PE pipe 6.

[0051] Implementation principle: In this embodiment, the hydraulic cylinder replaces the tightening method of the stud and nut in Embodiment 1. When the hydraulic cylinder contracts, it generates a strong squeezing force, pushing the expansion plug 2 into the sleeve 1. The frustum-shaped outer wall of the expansion plug 2 expands the port of the PE pipe 6 and tightly squeezes it between the outer wall of the expansion plug 2 and the inner wall of the sleeve 1. The hydraulic cylinder can provide a more uniform and stable squeezing force. Compared with the tightening method of the stud and nut, the adjustment is more convenient and fast, and the squeezing force can be flexibly controlled according to the actual construction requirements, better adapting to PE pipes 6 of different diameters and materials, and further optimizing the fixing effect on the PE pipe 6.

[0052] Effect achieved: By using a hydraulic cylinder to tightly fix, it not only inherits the advantage of the inner plug type fixation in Embodiment 1 that it is not easy to slip off, but also can complete the fixation operation more efficiently. During the construction process, the construction personnel can quickly adjust the extrusion force on the PE pipe 6 by controlling the telescopic movement of the hydraulic cylinder, reducing the time for the fixation operation and improving the construction efficiency. At the same time, since the extrusion force provided by the hydraulic cylinder is more stable, it can better ensure the uniformity of the expansion of the port of the PE pipe 6, making the force on the PE pipe 6 more uniform during the stretching process, avoiding damage to the PE pipe 6 caused by uneven local force, further improving the construction quality and reducing the construction risk.

[0053] The pipe extraction jack 4 and the jack for fixing the PE pipe 6 are both general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or obtained through conventional experimental methods, so no further description will be given here.

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A PE pipe extractor, characterized in that: It includes a casing (1) and an expansion plug (2). The casing (1) is sleeved on a PE pipe (6), and the PE pipe (6) passes through the casing (1) and is sleeved on the expansion plug (2). The outer shape of the expansion plug (2) is a frustum of a cone that is convenient for squeezing the PE pipe (6) tightly against the inner wall of the casing (1). The casing (1) and the expansion plug (2) are fixed by a tensioning mechanism, and a pipe-pulling jack (4) is arranged between the casing (1) and a steel pipe (5).

2. The PE pipe extractor according to claim 1, characterized in that: The tensioning mechanism includes a stud and a nut.

3. The PE pipe extractor according to claim 2, characterized in that: A first flange (11) is arranged at one end of the casing (1) away from the steel pipe (5), and a second flange (21) is arranged at one end of the expansion plug (2) away from the steel pipe (5). The stud passes through the first flange (11) and the second flange (21), and nuts for tensioning the first flange (11) and the second flange (21) are sleeved at both ends of the stud.

4. The PE pipe extractor according to claim 3, characterized in that: A third flange (51) is arranged on the steel pipe (5), and the pipe-pulling jack (4) is arranged between the third flange (51) and the first flange (11).

5. A PE pipe extraction process, characterized in that: When using a PE pipe pulling device according to any one of claims 1-4, it specifically includes the following steps: Step S1: After the PE pipe (6) is reduced in diameter and lined, leave a certain length of the PE pipe (6). Step S2: Let the lined PE pipe (6) fully retract to reach the state before diameter reduction. Step S3: Sleeve the casing (1) of the pulling device on the PE pipe (6) at the outlet. Step S4: Insert the matching expansion plug (2) into the pipe orifice of the PE pipe (6). Step S5: Squeeze the expansion plug into the pulling device through the tensioning mechanism to expand the port of the PE pipe (6) to form a "flare", and let the PE pipe (6) be squeezed between the outer wall of the expansion plug (2) and the inner wall of the casing (1). Step S6: Drive the pipe-pulling jack (4) to extend to stretch the lined pipe. Step S7: After the PE pipe (6) is stretched in place, fix the stretched PE pipe (6). Step S8: Remove the pulling device and perform subsequent construction operations such as welding the PE flange.

6. A PE pipe pulling process according to claim 5, characterized in that: In step S7, the fixing of the PE pipe (6) is achieved by placing a jack inside the PE pipe (6) and extending it to make the PE pipe (6) abut against the inner wall of the steel pipe (5).

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