CN112829315A

CN112829315A - Welding process and equipment for PE (polyethylene) pipe joint

Info

Publication number: CN112829315A
Application number: CN202011547932.XA
Authority: CN
Inventors: 张彭
Original assignee: Xuzhou Tengze Pipe Industry Co ltd
Current assignee: Xuzhou Tengze Pipe Industry Co ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-05-25

Abstract

The invention discloses a welding process of a PE pipe joint, which comprises the following steps of cleaning the end face and the welding face of a pipe; respectively installing a left pipe and a right pipe on a welding frame, enabling end faces of the two PE pipes not to coincide, sleeving an outer sleeve on the outer wall of the left pipe, sleeving an inner sleeve on the inner wall of the right pipe, and respectively connecting binding posts of the outer sleeve and the inner sleeve to a power supply of a welding machine for heating and softening; dragging the upper and lower half rings of the outer sleeve to separate, so that the left tube softening part is sleeved outside the right tube softening part, closing the upper and lower half rings of the outer sleeve, and continuously heating to melt and weld; switching off the power switch for cooling; and (5) after the welding is finished, taking out the outer sleeve and the inner sleeve. The invention also discloses welding equipment used by the welding process. According to the welding process of the PE pipe joint, the welding process is performed through three stages of softening, overlapping and electric fusion welding, and the welding joint is stable in performance, strong in bearing capacity and long in service life.

Description

Welding process and equipment for PE (polyethylene) pipe joint

Technical Field

The invention belongs to the field of plastic pipe welding, and particularly relates to a welding process and equipment for a PE pipe joint.

Background

The PE pipe comprises a medium-density polyethylene pipe and a high-density polyethylene pipe, which are classified into SDR11 and SDR17.6 series according to the wall thickness, the former is suitable for conveying gaseous artificial gas, natural gas and liquefied petroleum gas, the latter is mainly used for conveying natural gas, compared with steel pipes, the polyethylene pipe has great advantages from the economic angle and the environmental protection angle, so the PE pipe is widely applied to building and industrial construction, the construction process is simple, the PE pipe has certain flexibility, more importantly, the PE pipe does not need to be subjected to corrosion protection treatment, a large number of working procedures are saved, in the pipeline arrangement, the PE pipe is often required to be welded so as to facilitate the transportation of the pipe, in the pipe welding, the end face is generally subjected to hot melting welding by using an electric heating plate, the contact surface is small, the molecular chain permeation entanglement area is small, the welding strength and the service life of the pipe are influenced, meanwhile, the manual experience, causing a problem of poor load-bearing capacity at the joint.

The invention aims to provide a welding process and equipment for a PE pipe joint, so as to solve the problems in the background technology.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide a welding process of a PE pipe joint, wherein the welding process comprises three stages of softening, overlapping and electric fusion welding, and the welding process is subjected to superposition type melting after softening, so that the fusion area is increased, and the welding joint has stable performance, strong bearing capacity and long service life.

In order to achieve the purpose, the invention provides a welding process of a PE pipe joint, which comprises the following steps:

1) cleaning the end face and the welding face of the pipe;

2) respectively installing a left pipe and a right pipe on a welding frame, enabling end faces of the two PE pipes not to coincide, sleeving an outer sleeve on the outer wall of the left pipe, sleeving an inner sleeve on the inner wall of the right pipe, and respectively connecting binding posts of the outer sleeve and the inner sleeve to a power supply of a welding machine for heating and softening;

3) dragging the upper and lower half rings of the outer sleeve to separate, so that the left tube softening part is sleeved outside the right tube softening part, closing the upper and lower half rings of the outer sleeve, and continuously heating to melt and weld;

4) switching off the power switch for cooling;

5) and (5) after the welding is finished, taking out the outer sleeve and the inner sleeve.

Further, in the welding process of the PE pipe joint, the cleaning in step 1 is to mill the butt joint end surfaces of the left pipe and the right pipe of the two sections of PE pipes to be welded, and to turn the inner wall and the outer wall of the connecting section to remove the oxide layer.

Further, according to the welding process for the PE pipe joint, the turning depth of the inner wall and the outer wall is one fifth of the wall thickness of the PE pipe.

Further, in the welding process for the joint of the PE pipe, after the oxide layer is removed in the step 1, the cut surface is cleaned and dried, and the oxide layer, dust, impurities and the like all affect the welding of the PE molecular chain, thereby affecting the welding performance.

Further, in the welding process of the PE pipe joint, the maximum temperature of the outer sleeve and the inner sleeve in the

steps

2 and 3 is set to be 200-.

Further, in the welding process for the PE pipe joint, the welding machine compensates the cooling time according to the welding environment temperature in the step 4, so that the influence of the environment temperature on the cooling time is avoided.

The utility model provides a PE tubular product connects welding equipment, includes electric fusion welding machine, outer sleeve, inner skleeve and tubular product clamping subassembly, tubular product clamping subassembly contains slide rail, stiff end pipe clamp and removes the end pipe clamp, stiff end pipe clamp fixed mounting is in slide rail one end, remove end pipe clamp movable mounting on the slide rail to just right with stiff end pipe clamp, the axiality precision of two PE pipes when being convenient for remove.

Furthermore, according to the PE pipe joint welding equipment, the outer sleeve is formed by combining the upper half ring and the lower half ring, and the two PE pipes are conveniently butted in the heating process of the outer sleeve.

Further, foretell PE tubular product connects welding equipment, stiff end pipe clamp base is equipped with a set of guide arm, the guide arm passes and removes the end pipe clamp, improves the straightness accuracy of removal, the slide rail other end is equipped with the guide arm support, extension guide arm life avoids receiving gravity to influence for a long time and warp and need change.

Further, in the welding equipment for the PE pipe joint, a temperature sensor is arranged in the electric fusion welding machine, and a temperature compensation system is arranged.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the welding process for the PE pipe joint, the inner wall and the outer wall of the PE pipe to be connected are turned to a certain depth, and are subjected to superposition type melting after being softened, so that the fusion area is increased, and the welding strength and the coaxiality after welding are ensured.

2. According to the welding process for the PE pipe joint, the inner sleeve and the outer sleeve are arranged to enable the two PE pipes to expand and soften in opposite directions, so that different diameters can be conveniently formed, and the PE pipes can be conveniently sleeved.

3. According to the welding equipment for the PE pipe joint, the outer sleeve is designed into a combined form of the upper part and the lower part, so that two PE pipes can be conveniently sleeved.

Drawings

FIG. 1 is a cross-sectional view of a PE tube cleaned in step 1 of a welding process;

FIG. 2 is a schematic diagram of the structure after step 2 of the welding process;

FIG. 3 is a schematic structural view of the pipe clamping assembly of the present invention.

Detailed Description

The invention will be further elucidated by taking a high density PE pipe of PE100 with a diameter of 100mm and a wall thickness of 6.6mm as an example material in conjunction with the accompanying drawings and specific examples.

In the description of the present invention, it is to be understood that the terms "lateral", "length", "width", "thickness", "left", "right", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the invention.

A welding process for a PE pipe joint comprises the following steps:

1) cleaning the end face and the welding face of the pipe, as shown in figure 1;

2) as shown in fig. 2, the left tube 100 and the right tube 200 are respectively installed on a welding frame, the end faces of the two PE tubes are not overlapped, the outer wall of the left tube 100 is sleeved with the outer sleeve 300, the inner wall of the right tube 200 is sleeved with the inner sleeve 400, the binding posts 500 of the outer sleeve 300 and the inner sleeve 400 are respectively connected to a welder power supply for heating and softening, the left tube 100 is shrunk outwards under the heating action of the outer sleeve 300, the right tube 200 is shrunk inwards under the heating action of the inner sleeve 400, wherein the section b is a heating section, and the section c is a supporting section of the outer sleeve 300 and the inner sleeve 400;

3) dragging the upper half ring and the lower half ring of the outer sleeve 300 to separate, so that the softened part of the left tube 100 is sleeved outside the softened part of the right tube 200, closing the upper half ring and the lower half ring of the outer sleeve 300, and continuously heating to melt and weld, wherein the heating time is 2 minutes;

4) as shown in fig. 3, the power switch is turned off to perform cooling, and the cooling time is set to 18 minutes;

5) after the welding is completed, the outer sleeve 300 and the inner sleeve 400 are removed.

Further, as shown in fig. 1, in the welding process of the PE pipe joint, in the step 1, cleaning is to mill the butt end faces of the left pipe 100 and the right pipe 200 of two sections of PE pipes to be welded, and to turn the inner wall and the outer wall of the connecting section to remove the oxide layer, where the section a is a part to be overlapped.

Further, according to the welding process of the PE pipe joint, the turning depth of the inner wall and the outer wall is 1.1mm, and the tolerance is 0.02.

Further, in the welding process of the PE pipe joint, after the oxide layer is removed in the step 1, the cut surface is cleaned and dried, the length of the cleaning and drying is larger than the length of the a segment, and the cleaning and drying process is mainly carried out by using a dust-removing rag for wiping.

Further, in the above welding process for the PE pipe joint, the maximum temperature of the outer sleeve 300 and the inner sleeve 400 in

steps

2 and 3 is set to 205 degrees celsius, and the welder voltage is set to 39 volts.

Further, in the welding process for the PE pipe joint, in the step 4, the welding machine compensates the cooling time according to the welding environment temperature, since the indoor temperature is 25 degrees, the cooling time is not affected, and generally, if the temperature is higher than 25 degrees or lower than 20 degrees, the compensation is performed for 1 minute every time when the welding time differs by one degree.

The utility model provides a PE tubular product connects welding equipment, as shown in fig. 3, includes electric fusion welding machine, outer sleeve 300, inner skleeve 400 and tubular product clamping subassembly, tubular product clamping subassembly contains slide rail 1, stiff end pipe holder 2 and removes end pipe holder 3, stiff end pipe holder 2 fixed mounting is in slide rail 1 one end, remove end pipe holder 3 movable mounting on slide rail 1 to just right with stiff end pipe holder 2, left pipe 100 is installed in removing end pipe holder 3, and right pipe 200 is installed in stiff end pipe holder 2, utilizes stiff end pipe holder 2 and removal end pipe holder 3 to be the looks isostructure and all install on slide rail 1, so the axle center is basic coincidence except less error.

Further, in the above PE pipe joint welding apparatus, the outer sleeve 300 is formed by combining the upper half ring and the lower half ring, and when the left pipe 100 moves, the section b is softened, so that the sleeve 300 is designed into two half rings to avoid interference with the left pipe 100.

Further, as shown in fig. 3, in the welding equipment for the PE pipe joint, the fixed end pipe clamp 2 is provided with a set of guide rods 4 on the base, the guide rods 4 penetrate through the movable end pipe clamp 3, and the other end of the slide rail 1 is provided with a guide rod support 5 for guiding when two pipes are stacked.

The above-mentioned embodiments should not be construed as limiting the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. which are made by those skilled in the art within the spirit and principle of the present invention and which are beneficial to the changes of the voltage, temperature, time, etc. of the heating softening and electrofusion welding of different materials and different pipe diameters should be included in the scope of the present invention, and the contents which are not described in detail in the present specification are the prior art known to those skilled in the art.

Claims

1. A welding process for a PE pipe joint is characterized by comprising the following steps: the method comprises the following steps:

1) cleaning the end face and the welding face of the pipe;

2) respectively installing a left pipe (100) and a right pipe (200) on a welding frame, enabling end faces of the two PE pipes not to coincide, sleeving an outer sleeve (300) on the outer wall of the left pipe (100), sleeving an inner sleeve (400) on the inner wall of the right pipe (200), and respectively connecting binding posts (500) of the outer sleeve (300) and the inner sleeve (400) to a power supply of a welding machine for heating and softening;

3) dragging the upper half ring and the lower half ring of the outer sleeve (300) to separate, so that the softened part of the left pipe (100) is sleeved outside the softened part of the right pipe (200), closing the upper half ring and the lower half ring of the outer sleeve (300), and continuously heating to melt and weld;

4) switching off the power switch for cooling;

5) after the welding is finished, the outer sleeve (300) and the inner sleeve (400) are removed.

2. The PE pipe joint welding process of claim 1, wherein: the cleaning in the step 1 is to mill the butt joint end faces of the left pipe (100) and the right pipe (200) of the two sections of PE pipes to be welded, and to turn the inner wall and the outer wall of the connecting section to remove the oxide layer.

3. The PE pipe joint welding process of claim 2, wherein: the turning depth of the inner wall and the outer wall is one fifth of the wall thickness of the PE pipe.

4. The PE pipe joint welding process of claim 2, wherein: and (3) cleaning and drying the cut surface after removing the oxide layer in the step (1).

5. The PE pipe joint welding process of claim 1, wherein: the maximum temperature of the outer sleeve (300) and the inner sleeve (400) in the step 2 and the step 3 is set to be 200-220 ℃.

6. The PE pipe joint welding process of claim 1, wherein: and in the step 4, the welding machine compensates the cooling time according to the welding environment temperature.

7. The utility model provides a PE tubular product connects welding equipment, its characterized in that, includes electric fusion welding machine, outer sleeve (300), inner skleeve (400) and tubular product clamping subassembly, tubular product clamping subassembly contains slide rail (1), stiff end pipe clamp (2) and removes end pipe clamp (3), stiff end pipe clamp (2) fixed mounting in slide rail (1) one end, remove end pipe clamp (3) movable mounting on slide rail (1) to just right with stiff end pipe clamp (2).

8. The PE pipe joint welding apparatus of claim 7, wherein: the outer sleeve (300) is formed by combining an upper half ring and a lower half ring.

9. The PE pipe joint welding apparatus of claim 7, wherein: the fixed end pipe clamp (2) is characterized in that a base is provided with a group of guide rods (4), the guide rods (4) penetrate through the movable end pipe clamp (3), and the other end of the sliding rail (1) is provided with a guide rod support (5).

10. The PE pipe joint welding apparatus of claim 7, wherein: the electric fusion welding machine is internally provided with a temperature sensor and a temperature compensation system.