CN110260078B - Wedge-shaped welding method and welding structure of large-caliber plastic pipe - Google Patents
Wedge-shaped welding method and welding structure of large-caliber plastic pipe Download PDFInfo
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- CN110260078B CN110260078B CN201910651178.5A CN201910651178A CN110260078B CN 110260078 B CN110260078 B CN 110260078B CN 201910651178 A CN201910651178 A CN 201910651178A CN 110260078 B CN110260078 B CN 110260078B
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- pin rod
- wedge
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- 238000003466 welding Methods 0.000 title claims abstract description 287
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000004033 plastic Substances 0.000 title claims abstract description 36
- 229920003023 plastic Polymers 0.000 title claims abstract description 36
- 230000004927 fusion Effects 0.000 claims abstract description 15
- 238000011282 treatment Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims description 49
- 239000000463 material Substances 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 239000004429 Calibre Substances 0.000 claims description 2
- 238000003825 pressing Methods 0.000 abstract description 6
- 238000001125 extrusion Methods 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
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- 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
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/02—Welded joints; Adhesive joints
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention discloses a wedge-shaped welding method and a welding structure of a large-caliber plastic pipe, which are suitable for forming and processing of a straight pipe, an elbow and a tee joint of a large-caliber (with the diameter DN more than 3000 mm) and a thick-wall pipe (with the diameter more than 200 mm). And the connection and fixation of the two pipe bodies are realized through one-time or two-time welding treatment. Utilize the wedge face structure of taper pin stick, on the one hand can be very easy put into the butt fusion downthehole with the taper pin stick, on the other hand combines the length of taper pin stick to be greater than the characteristic of butt fusion downthehole, through pressing taper pin stick axial, promotes the taper pin stick to the butt fusion downthehole motion, utilizes the conical surface extrusion butt fusion hole of taper pin stick axle, and taper pin stick and butt fusion downthehole face contact extrusion, and the pressurize is stable, effectual, has improved taper pin stick and body coupling's intensity.
Description
Technical Field
The invention relates to the technical field of welding of large-caliber plastic pipes, in particular to a wedge-shaped welding method and a welding structure of a large-caliber plastic pipe, which are suitable for forming and processing straight pipes, elbows and three-way pipes of large caliber (more than 3000mm in diameter) and thick-wall pipes (more than 200mm in diameter).
Background
Welding is the process of forming an integral joint by means of interatomic bonding and proton diffusion. Welding is also considered to be a method of joining two or more workpieces together using a filler material to form an inseparable, strong joint by using thermal energy or mechanical pressure, or both.
The existing welding modes for large-caliber pipes mainly comprise groove fusion welding, hot fusion butt welding and electric fuse socket fusion welding.
The groove fusion welding generally adopts an electric fusion welding gun, and adopts a manual operation welding method of forming a welding line by using hot air to melt a welding wire and a base material, wherein the temperature of the hot air is about 160-220 ℃, the electric fusion welding gun is suitable for short welding lines, and the electric fusion welding gun has the advantages of great labor intensity and low working efficiency for welding large-caliber pipes. And in groove fusion welding, the weld seams are required to be uniform.
The hot-melt butt welding is a welding method which is carried out by heating two ends of a pipe by using a heating plate and then connecting the two ends, wherein pressure (heating or not) is applied to a welding surface in the connecting process. The clamp is needed to be used for pressing the welding end face of the pipe body in the operation process, and when the clamp is installed and detached, the two pipe bodies are needed to be axially moved, so that the two pipe bodies are separated by a certain distance to be used for installing the clamp and applying pressure to the clamp, the operation is complex, when the diameter and the weight of the pipe body are large, the required clamp is large in size, the pipe body is difficult to move, certain requirements are also met for the operation space, and the uniformity of joints of the two pipe bodies is also met during pressure welding, so that the welding seam is required to be uniform.
The electric fuse is used for socket joint and welding, the electric fuse is arranged at the joint, and the material at the joint is melted by heating the electric fuse, so that the two pipes are connected. When the large-caliber pipe body is inserted, the diameter error of the pipe is increased along with the larger diameter of the pipe body, the pipe can be elliptical, the error of the two pipes is larger, the contact area of the two pipe bodies is reduced, and the connecting strength and the sealing performance of the pipe are poor.
Therefore, there is a difficulty in welding a large-diameter pipe in the related art.
Disclosure of Invention
The invention aims to solve the technical problem of providing a wedge-shaped welding method and a welding structure of a large-caliber plastic pipe, which are suitable for large-caliber pipe connection molding, convenient to operate and high in connection strength.
In order to solve the technical problems, the invention adopts the following technical scheme:
The wedge-shaped welding method of the large-caliber plastic pipe is characterized by comprising the following steps of:
A. Pretreatment:
processing and forming two or more sections of end faces or intersecting grooves of the same plastic material according to requirements, then assembling the two sections of end faces or intersecting grooves to the shape of a finished product, and pre-fixing the two sections of end faces of the two sections of pipe to be welded so as to keep stable contact;
B. And (3) primary welding treatment:
b1. preparing a plurality of wedge-shaped primary welding holes at equal intervals in the circumferential direction at the joint of the two pipe bodies, wherein the centers of the primary welding holes are positioned on the joint of the two pipe bodies, and the plurality of primary welding holes are radially arranged by taking the center of the circle where the joint is positioned as the center;
b2. Acquiring a primary taper pin rod which is matched with the primary welding hole and is made of the same material as the pipe body, wherein the length of the primary taper pin rod is larger than the depth of the primary welding hole, so that the large end of the primary taper pin rod can protrude out of the primary welding hole after being matched with the primary welding hole;
b3. the primary welding hole and the primary taper pin rod are matched in a heating welding way, and the primary taper pin rod is axially pressurized, so that the primary taper pin rod extrudes the primary welding hole;
b4. maintaining pressure until the primary welding holes and the primary taper pin bars are cooled;
C. secondary welding treatment:
c1. Preparing a second welding hole which is also wedge-shaped between two adjacent first welding holes, intersecting the second welding hole with the adjacent first welding holes, and radially arranging the plurality of second welding holes by taking the center of the circle where the joint is positioned as the center;
c2. The method comprises the steps of obtaining a secondary taper pin rod which is matched with a secondary welding hole and made of the same material as a pipe body, wherein the length of the secondary taper pin rod is larger than the depth of the secondary welding hole, so that the large end of the secondary taper pin rod can protrude out of the secondary welding hole after being matched with the secondary welding hole;
c3. the secondary welding hole and the secondary taper pin rod are heated, welded and matched, and the secondary taper pin rod is axially pressurized, so that the secondary taper pin rod extrudes the secondary welding hole;
c4. And maintaining the pressure until the secondary welding holes and the secondary taper pin bars are cooled.
The further technical proposal is that: step C is followed by a step D shaping process: and removing the primary taper pin rod and the secondary taper pin rod protruding out of the pipe body.
The further technical proposal is that: step b3 and/or step c3 comprises the steps of:
e1. Separately heating the inner surfaces of the primary welding holes and/or the secondary welding holes and the outer surfaces of the primary taper pin rods and/or the secondary taper pin rods to ensure that the primary taper pin rods and/or the secondary taper pin rods are provided with softening layers with the thickness of 2-5 mm;
e2. The primary taper pin rod and/or the secondary taper pin rod are placed in the corresponding primary welding hole and/or secondary welding hole;
e3. Extruding from the big end to the small end of the primary taper pin rod and/or the secondary taper pin rod or pulling from the small end. The further technical proposal is that: also between step e1 and step e2 is a step e1.5:
e1.5. and cooling the primary taper pin rod and/or the secondary taper pin rod and/or the primary welding hole and/or the secondary welding hole to the surface crust.
The further technical proposal is that: step b3 or step c3 comprises the steps of:
f1. spirally winding a heating wire on the surface of the primary taper pin rod or the secondary taper pin rod;
f2. Placing the primary taper pin rod or the secondary taper pin rod in a corresponding primary welding hole or secondary welding hole, and electrifying the heating wire to enable the contact surface to be molten to realize welding;
f3. The primary taper pin rod or the secondary taper pin rod is extruded from the large end to the small end or pulled from the small end.
The further technical proposal is that: the diameter of the heating wire is 1-2.2 mm, and the interval between two adjacent heating wires is 2-10 mm.
The further technical proposal is that: the preparation of the primary welding hole comprises the following steps:
g1. After the pretreatment operation is carried out to hoist the pipe body in place, a plurality of wedge-shaped half grooves are processed on the end face of the pipe body to be welded at equal intervals in the circumferential direction;
g2. after the pretreatment operation is carried out to assemble the pipe body to a finished product shape, the pipe body is rotated, so that the wedge-shaped half grooves of the two pipe bodies form a complete wedge-shaped hole.
The further technical proposal is that: the small end of the primary welding hole and the small end of the secondary welding hole are arranged in opposite directions.
The further technical proposal is that: the small ends of the primary welding hole and the secondary welding hole are arranged towards the inside of the pipe body.
The further technical proposal is that: the center distance between the large ends of two adjacent primary welding holes is more than 20 mm.
The further technical proposal is that: the cross sections of the primary welding holes and the secondary welding holes are round, rectangular, elliptic or regular polygon.
The further technical proposal is that: the small ends of the primary taper pin rod and the secondary taper pin rod are respectively provided with a pulling part for pulling the primary taper pin rod and the secondary taper pin rod to move axially.
The utility model provides a wedge butt fusion structure of heavy-calibre plastic tubing, is coaxial, is angle or intersecting connection, and is two sections or multistage body with the plastics material, its characterized in that: and the joint of the connected first pipe body and the connected second pipe body is welded by a wedge-shaped welding method of a large-caliber plastic pipe to form a connecting body.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in:
The method realizes the connection and fixation of two pipe bodies through two welding treatments.
When in one-time welding treatment, a plurality of one-time welding holes are processed at intervals at the joint of the two pipe bodies, the inner wall of the same one-time welding hole is formed by the end surfaces of the two pipe bodies, one-time taper pin rod is embedded into the one-time welding hole, and one periphery of the one-time taper pin rod is welded with the two pipe bodies at the same time, so that the connection of the two pipe bodies is realized.
During secondary welding treatment, a secondary welding hole is processed between two primary welding holes, so that the inner wall of the same secondary welding hole is formed by the end faces of two pipe bodies and two primary taper pin rods, the secondary taper pin rods are embedded into the secondary welding hole, and one periphery of each secondary taper pin rod is welded with the two pipe bodies and the two primary taper pin rods simultaneously, so that connection of the two pipe bodies is realized, and a plurality of primary taper pin rods are connected into a whole, and welding strength is improved.
When primary welding and secondary welding, the wedge-shaped surface structure of the taper pin rod is utilized, on one hand, the taper pin rod can be easily placed into the welding hole, on the other hand, the length of the taper pin rod is combined with the characteristic that the depth of the welding hole, the taper pin rod is axially pressed, the taper pin rod is promoted to move towards the welding hole, the taper pin rod shaft is utilized to extrude the welding hole, the taper pin rod and the welding hole are in surface-to-surface contact extrusion, the pressure maintaining is stable, the effect is good, and the connection strength of the taper pin rod and the pipe body is improved.
The method is suitable for connecting the pipe bodies of various forms (such as identical pipes, elbows, tees and the like) of the large-caliber and thick-wall pipes, particularly for welding special pipes, the thicker the pipe wall is, the higher the connecting strength is, the method does not need to use a clamp, move the pipe bodies and the like, and is convenient, reliable, flexible, high in efficiency and high in strength.
The wedge-shaped welding structure of the large-caliber plastic pipe formed by the method has the performance of connecting the two pipes at high efficiency.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic view of a prior art straight tube construction;
FIG. 2 is a schematic view of a prior art elbow;
FIG. 3 is a schematic view of a prior art tee;
FIG. 4 is a schematic view of the structure of the welded holes at the seam of the pipe body in example 3.1 of the present invention (the primary welded holes and the secondary welded holes are oriented in the same direction);
FIG. 5 is a schematic view showing the installation structure of the taper pin rod at the joint of the pipe body in the embodiment 3.1 of the present invention;
FIG. 6 is a schematic view of the pipe joint (circular weld hole) according to example 3.1 of the present invention;
FIG. 7 is another schematic view of the pipe joint of example 3.1 of the present invention (rectangular weld hole);
FIG. 8 is a schematic view of the structure of the welded holes at the seam of the pipe body in example 3.2 (the primary welded holes and the secondary welded holes are opposite in orientation);
FIG. 9 is a schematic view showing the installation structure of the taper pin rod at the joint of the pipe body in the embodiment 3.2 of the present invention;
FIG. 10 is a schematic view of the pipe joint (circular weld hole) according to example 3.2 of the present invention;
FIG. 11 is another schematic view of the pipe joint of example 3.2 according to the present invention (rectangular weld hole);
FIG. 12 is a schematic view of a taper pin according to the present invention;
Fig. 13 is a schematic view of another construction of the taper pin of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present invention based on only the embodiments of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
The wedge-shaped welding method of the large-caliber plastic pipe comprises the following steps:
A. Pretreatment:
processing and forming two or more sections of end faces or intersecting grooves of the same plastic material according to requirements, then assembling the two sections of end faces or intersecting grooves to the shape of a finished product, and pre-fixing the two sections of end faces of the two sections of pipe to be welded so as to keep stable contact;
B. And (3) primary welding treatment:
b1. preparing a plurality of wedge-shaped primary welding holes 11 at equal intervals in the circumferential direction at the joint of the two pipe bodies, wherein the centers of the primary welding holes 11 are positioned on the joint of the two pipe bodies, and the plurality of primary welding holes 11 are radially arranged by taking the center of the circle where the joint is positioned as the center;
b2. Acquiring a primary taper pin 13 which is matched with the primary welding hole 11 and is made of the same material as the pipe body, wherein the length of the primary taper pin 13 is larger than the depth of the primary welding hole 11, so that the large end of the primary taper pin 13 can protrude out of the primary welding hole 11 after being matched with the primary welding hole 11;
b3. the primary welding hole 11 and the primary taper pin 13 are in heating welding fit, and the primary taper pin 13 is axially pressurized, so that the primary taper pin 13 extrudes the primary welding hole 11;
b4. maintaining the pressure for a certain time until the primary welding hole 11 and the primary taper pin 13 are cooled;
C. secondary welding treatment:
c1. Preparing a second welding hole 12 which is also wedge-shaped between two adjacent first welding holes 11, intersecting the second welding holes 12 with the adjacent first welding holes 11, and radially arranging a plurality of the second welding holes 12 by taking the center of the joint as the center;
c2. Acquiring a secondary taper pin 14 which is matched with the secondary welding hole 12 and is made of the same material as the pipe body, wherein the length of the secondary taper pin 14 is larger than the depth of the secondary welding hole 12, so that the large end of the secondary taper pin 14 can protrude out of the secondary welding hole 12 after being matched with the secondary welding hole 12;
c3. the secondary welding hole 12 and the secondary taper pin 14 are heated, welded and matched, and the secondary taper pin 14 is axially pressurized, so that the secondary taper pin 14 extrudes the secondary welding hole 12;
c4. And maintaining the pressure for a certain time until the secondary welding holes 12 and the secondary taper pin bars 14 are cooled.
The method realizes the connection and fixation of two pipe bodies through two welding treatments.
When in primary welding treatment, a plurality of primary welding holes 11 are machined at intervals at the joint of two pipe bodies, the inner wall of the same primary welding hole 11 is formed by the end faces of the two pipe bodies, a primary taper pin 13 is embedded in the primary welding hole 11, and one periphery of the primary taper pin 13 is welded with the two pipe bodies at the same time, so that the primary fixing of the connection of the two pipe bodies is realized.
During secondary welding treatment, the secondary welding hole 12 is processed between the two primary welding holes 11, so that the inner wall of the same secondary welding hole 12 is formed by the end faces of two pipe bodies and the two primary taper pin rods 13, the secondary taper pin rods 14 are embedded into the secondary welding hole 12, and one periphery of each secondary taper pin rod 14 is welded with the two pipe bodies and the two primary taper pin rods 13 at the same time, so that connection of the two pipe bodies is realized, and a plurality of primary taper pin rods 13 are connected into a whole to complete secondary welding fixation, and welding strength is improved.
When primary welding and secondary welding, the wedge-shaped surface structure of the taper pin rod is utilized, on one hand, the taper pin rod can be easily placed into the welding hole, on the other hand, the length of the taper pin rod is combined with the characteristic that the depth of the welding hole, the taper pin rod is axially pressed, the taper pin rod is promoted to move towards the welding hole, the taper pin rod shaft is utilized to extrude the welding hole, the taper pin rod and the welding hole are in surface-to-surface contact extrusion, the pressure maintaining is stable, the effect is good, and the connection strength of the taper pin rod and the pipe body is improved.
The method is suitable for connecting the pipe bodies of various forms (such as coaxial, elbow, tee joint and the like as shown in figures 1-3) of large-caliber and thick-wall pipes, particularly for welding special pipes, the thicker the pipe wall is, the higher the connecting strength is, the method does not need to use a clamp, move the pipe bodies and the like, and has the advantages of convenient operation, reliability, flexibility, high efficiency and high strength.
According to the use requirement, the shaping treatment of step D is further carried out after step C, and as the lengths of the primary taper pin 13 and the secondary taper pin 14 are larger than the hole depths, the primary taper pin 13 and the secondary taper pin 14 protruding out of the pipe body are removed according to the use requirement. When the pipe body is buried underground, only the taper pin rod protruding out of the inner wall of the pipe body is required to be removed, and the use strength of the pipe body can be improved by forming the reinforcing rib at the part protruding out of the pipe body, so that the bonding strength of the pipe body and soil is improved.
For the heat-melted form of the welding hole and the taper pin rod, separate heating or simultaneous heating may be employed, and in particular, three embodiments may be employed.
Example 1.1
In the primary welding and the secondary welding, the welding hole and the taper pin rod are heated independently, and the specific operation of the step b3 and the step c3 is the same, and the method comprises the following steps:
e1. The inner surfaces of the primary welding hole 11 and the secondary welding hole 12 and the outer surfaces of the primary taper pin 13 and the secondary taper pin 14 are respectively heated independently, so that the primary taper pin and the secondary taper pin have softening layers with the thickness of 2-5 mm;
e2. Placing the primary taper pin 13 and the secondary taper pin 14 in the corresponding primary welding hole 11 and secondary welding hole 12;
e3. the primary taper pin 13 and the secondary taper pin 14 are pressed from the large end to the small end or pulled from the small end.
Example 1.2
The primary welding hole 11 and the primary taper pin 13 are heated simultaneously in primary welding, and the secondary welding hole 12 and the secondary taper pin 14 are heated separately in secondary welding.
The specific step b3 comprises the following steps: f1. spirally winding a heating wire on the surface of the primary taper pin 13;
f2. The primary taper pin 13 is placed in the corresponding primary welding hole 11, and the heating wire is electrified to melt the contact surface to realize welding;
f3. Pressing from the large end to the small end of the primary taper pin 13, or pulling from the small end.
Step c3 comprises the steps of:
e1. independently heating the inner surface of the secondary welding hole 12 and the outer surface of the secondary taper pin 14 to form a softened layer with the thickness of 2-5 mm;
e2. placing the secondary taper pin 14 into the corresponding secondary welding hole 12;
e3. squeezing from the large end to the small end of the secondary taper pin bar 14, or pulling from the small end.
Example 1.3
The primary welding hole 11 and the primary taper pin 13 in the primary welding are heated separately, and the secondary welding hole 12 and the secondary taper pin 14 in the secondary welding are heated simultaneously.
The specific step b3 comprises the following steps:
e1. Independently heating the inner surface of the primary welding hole 11 and the outer surface of the primary taper pin 13 to ensure that the primary taper pin 13 has a softening layer with the thickness of 2-5 mm;
e2. Placing the primary taper pin 13 in the corresponding primary welding hole 11;
e3. Pressing from the large end to the small end of the primary taper pin 13, or pulling from the small end.
Step c3 comprises the steps of:
f1. Spirally winding a heating wire on the surface of the secondary taper pin rod 14;
f2. Placing the secondary taper pin rods 14 in the corresponding secondary welding holes 12, and electrifying the heating wires to melt the contact surfaces to realize welding;
f3. squeezing from the large end to the small end of the secondary taper pin bar 14, or pulling from the small end.
If both electric fuses are used for welding, a short circuit phenomenon occurs when the electric fuses are heated at the same time, so that the electric fuses cannot be used for welding and fixing the two times.
The taper pin rod and the welding hole adopt a single heating mode, the taper pin rod and the welding hole can be heated by utilizing a heating tool, and the heating effect is controllable.
The heating tool for wedge-shaped welding of the large-caliber plastic pipe comprises a heating rod for heating the inner wall of the primary welding hole 11 and/or the secondary welding hole 12 and a heating sleeve for heating the outer wall of the primary taper pin 13 and/or the secondary taper pin 14.
The heating rods are metal shell electric heating elements, the outer surface shapes of the heating rods are matched with the inner surfaces of the primary welding holes 11 and/or the secondary welding holes 12, the inner surfaces of the primary welding holes 11 and/or the secondary welding holes 12 can be heated respectively, and a plurality of heating rods can also heat a plurality of welding holes simultaneously. The heating rod can automatically control the heating temperature to enable the inner surface of the welding hole to be evenly melted.
The heating sleeve is a metal shell electric heating element, the shape of the inner surface of the heating sleeve is matched with the outer surfaces of the primary taper pin 13 and/or the secondary taper pin 14, the outer surfaces of the primary taper pin 13 and/or the secondary taper pin 14 can be heated respectively, and a plurality of heating sleeves can also heat a plurality of taper pin simultaneously. The heating sleeve can automatically control the heating temperature, so that the outer surface of the taper pin rod is uniformly melted.
In order to prevent the taper pin and the welding hole from being welded Kong Nianlian during placement of the taper pin when the taper pin is placed in the welding hole after being heated alone, a step e1.5 is further provided between the step e1 and the step e 2. Step e1.5, cooling the primary taper pin 13 and/or the secondary taper pin 14 and the primary welding hole 11 and/or the secondary welding hole 12 to the surface crust, wherein the cooling mode can lead out the surface heat of the primary taper pin 13 and/or the secondary taper pin 14 and the primary welding hole 11 and/or the secondary welding hole 12 to the crust by means of heat conducting materials such as an iron seat, a fan and the like, and the cooling time is about 2-10 s. When the taper pin rod is placed in place and extruded, the heat inside the taper pin rod and the welding hole breaks the crust of the surface layer, so that the welding of the two pipe bodies is realized.
The welding holes and the taper pin rods are heated simultaneously by the heating wires, so that operators are prevented from being scalded in the operation process, and the production safety is improved. In order to ensure the welding strength of the pipe body and the taper pin rod after the heating wires are electrified, the diameter of the heating wires is 1-2.2 mm, and the distance between two adjacent circles of heating wires is 2-10 mm, so that the heating wires are ensured to heat the welding holes and the taper pin rod to a softening layer with the thickness of 2-5mm after the heating wires are electrified.
And for the processing of the welding hole, the welding hole can be manufactured by once processing on site after fixing the pipe body in place. But in order to save the construction time, the steel can be processed before leaving the factory.
Example 2.1
The preparation of the primary welding hole 11 includes the steps of:
g1. After the pretreatment operation is carried out to hoist the pipe body in place, a plurality of wedge-shaped half grooves are processed on the end face of the pipe body to be welded at equal intervals in the circumferential direction;
g2. after the pretreatment operation is carried out to assemble the pipe body to a finished product shape, the pipe body is rotated, so that the wedge-shaped half grooves of the two pipe bodies form a complete wedge-shaped hole.
The arrangement of the primary welding hole 11 and the secondary welding hole 12 may specifically include two forms.
Example 3.1
As shown in fig. 4 to 7, the small ends of the primary welding hole 11 and the secondary welding hole 12 are opened toward the inside of the tube body. The arrangement mode is convenient for applying pressure to the welding rod from outside to inside, and can also pull the welding rod from the inside of the pipe body.
Example 3.2
As shown in fig. 8 to 11, the small end of the primary welding hole 11 and the small end of the secondary welding hole 12 are opened in opposite directions. By the arrangement mode, the primary taper pin rod 13 and the secondary taper pin rod 14 can be completely overlapped and intersected under the condition of smaller area intersection, the distance between the two primary welding holes 11 is enlarged, the arrangement of the welding holes is reduced, materials are reduced, the cost is saved, and the welding strength is improved.
In the above embodiment, the center distance between the large ends of the adjacent primary welding holes 11 is 20mm or more, so as to ensure the diameter of the taper pin rod and ensure the welding area of the taper pin rod and the two pipe bodies.
As for the shape of the welding holes, as shown in fig. 12 and 13, the cross-sectional shapes of the primary welding holes 11 and the secondary welding holes 12 are circular, rectangular, elliptical, or regular polygon. For convenience in processing and manufacturing, the primary welding hole 11 and the secondary welding hole 12 may be provided in the same shape and size. However, in order to enhance the annular welding strength between the primary taper pin 13 and the secondary taper pin 14 and the pipe body, when the cross section is rectangular or regular polygonal, and the form of example 3.1 is selected, the dimensions of the primary welding hole 11 and the secondary welding hole 12 are selected to be two sizes, so that after the primary taper pin 13 and the secondary taper pin 14 are welded, the concave-convex structure is formed on the side wall welded with the pipe body.
The wedge-shaped welding structure of the large-caliber plastic pipe comprises two or more sections of pipe bodies which are coaxial, are connected in an angle or through way and are made of the same plastic material, and the joint of the connected first pipe body 101 and the connected second pipe body 102 is welded to form the connecting body 10 by using a wedge-shaped welding method of the large-caliber plastic pipe.
Specifically, the primary welding structure in which the cross section of the connector 10 is in a wedge-shaped structure includes: the primary welding holes 11 are in a wedge-shaped through hole structure, are positioned at the joint of the first pipe body 101 and the second pipe body 102, and comprise a plurality of circumferentially equidistant openings, and the plurality of primary welding holes 11 are radially arranged by taking the center of the circle where the joint is positioned as the center; the connector 10 includes a primary taper pin 13, the primary taper pin 13 is made of plastic material and is filled in the primary welding hole 11, and the same circumferential surface of the primary taper pin 13 is welded with the first pipe body 101 and the second pipe body 102 respectively and can be in interference fit with the primary welding hole 11.
The secondary welding structure includes: the secondary welding holes 12 are in a wedge-shaped through hole structure, are positioned between two adjacent primary welding holes 11, are intersected with the two primary welding holes 11, and are radially arranged by taking the center of a circle where the joints are positioned as the center; the connector 10 further includes a secondary taper pin 14, the secondary taper pin 14 is made of plastic, and is filled in the secondary welding hole 12, and the same circumferential surface of the secondary taper pin 14 is welded with the first pipe 101, the second pipe 102 and the primary taper pin 13, and can be in interference fit with the secondary welding hole 12.
In order to facilitate pulling the taper pin, the small ends of the primary taper pin 13 and the secondary taper pin 14 are provided with a pulling portion 15 for pulling the axial movement thereof, and the pulling portion 15 may be in the form of a pull rope or a pull ring.
The foregoing is only a preferred embodiment of the present invention, and any and all simple modifications, variations and equivalents of the present invention will fall within the scope of the present invention.
Claims (13)
1. The wedge-shaped welding method of the large-caliber plastic pipe is characterized by comprising the following steps of:
A. Pretreatment:
processing and forming two or more sections of end faces or intersecting grooves of the same plastic material according to requirements, then assembling the two sections of end faces or intersecting grooves to the shape of a finished product, and pre-fixing the two sections of end faces of the two sections of pipe to be welded so as to keep stable contact;
B. And (3) primary welding treatment:
b1. Preparing a plurality of wedge-shaped primary welding holes (11) which are arranged along the radial direction at equal intervals in the circumferential direction at the joint of the two pipe bodies, wherein the centers of the primary welding holes (11) are positioned on the joint of the two pipe bodies, and the plurality of primary welding holes (11) are arranged in a radial manner by taking the center of the circle where the joint is positioned as the center;
b2. Acquiring a primary taper pin rod (13) which is matched with the primary welding hole (11) and is made of the same material as the pipe body, wherein the length of the primary taper pin rod (13) is larger than the depth of the primary welding hole (11), so that the large end of the primary taper pin rod (13) can protrude out of the primary welding hole (11) after being matched with the primary welding hole (11);
b3. The primary welding hole (11) and the primary taper pin (13) are matched in a heating welding way, and the primary taper pin (13) is axially pressurized, so that the primary taper pin (13) extrudes the primary welding hole (11);
b4. Maintaining pressure until the primary welding holes (11) and the primary taper pin bars (13) are cooled;
C. secondary welding treatment:
c1. Preparing a second welding hole (12) which is also wedge-shaped between two adjacent first welding holes (11), intersecting the second welding holes (12) with the adjacent first welding holes (11), and radially arranging a plurality of the second welding holes (12) by taking the center of the joint as the center;
c2. Acquiring a secondary taper pin rod (14) which is matched with the secondary welding hole (12) and is made of the same material as the pipe body, wherein the length of the secondary taper pin rod (14) is larger than the depth of the secondary welding hole (12), so that the large end of the secondary taper pin rod (14) can protrude out of the secondary welding hole (12) after being matched with the secondary welding hole (12);
c3. The secondary welding hole (12) and the secondary taper pin rod (14) are matched in a heating welding way, and the secondary taper pin rod (14) is axially pressurized, so that the secondary taper pin rod (14) extrudes the secondary welding hole (12);
c4. And maintaining the pressure until the secondary welding holes (12) and the secondary taper pin rods (14) are cooled.
2. A wedge welding method of large caliber plastic pipes according to claim 1, characterized in that: step C is followed by a step D shaping process: and removing the primary taper pin rod (13) and the secondary taper pin rod (14) protruding out of the pipe body.
3. A wedge welding method of large caliber plastic pipes according to claim 1, characterized in that: step b3 and/or step c3 comprises the steps of:
e1. The inner surfaces of the primary welding holes (11) and/or the secondary welding holes (12) and the outer surfaces of the primary taper pin rods (13) and/or the secondary taper pin rods (14) are respectively and independently heated, so that the primary taper pin rods and/or the secondary taper pin rods have softening layers with the thickness of 2-5 mm;
e2. The primary taper pin rod (13) and/or the secondary taper pin rod (14) are placed in the corresponding primary welding hole (11) and/or secondary welding hole (12);
e3. the primary taper pin rod (13) and/or the secondary taper pin rod (14) are extruded from the big end to the small end or pulled from the small end.
4. A wedge welding method of large caliber plastic pipes according to claim 3, wherein: also between step e1 and step e2 is a step e1.5:
e1.5. And cooling the primary taper pin rod (13) and/or the secondary taper pin rod (14) and the primary welding hole (11) and/or the secondary welding hole (12) to the surface crust.
5. A wedge welding method of large caliber plastic pipes according to claim 1, characterized in that: step b3 or step c3 comprises the steps of:
f1. Spirally winding a heating wire on the surface of a primary taper pin rod (13) or a secondary taper pin rod (14);
f2. The primary taper pin rod (13) or the secondary taper pin rod (14) is placed in the corresponding primary welding hole (11) or secondary welding hole (12), and the heating wire is electrified to enable the contact surface to be molten to realize welding;
f3. the primary taper pin rod (13) or the secondary taper pin rod (14) is extruded from the big end to the small end or pulled from the small end.
6. A wedge welding method of large caliber plastic pipes as claimed in claim 5, wherein: the diameter of the heating wire is 1-2.2 mm, and the distance between two adjacent circles of heating wires is 2-10 mm.
7. A wedge welding method of large caliber plastic pipes according to claim 1, characterized in that: the preparation of the primary welding hole (11) comprises the following steps:
g1. After the pretreatment operation is carried out to hoist the pipe body in place, a plurality of wedge-shaped half grooves are processed on the end face of the pipe body to be welded at equal intervals in the circumferential direction;
g2. after the pretreatment operation is carried out to assemble the pipe body to a finished product shape, the pipe body is rotated, so that the wedge-shaped half grooves of the two pipe bodies form a complete wedge-shaped hole.
8. A wedge welding method of large caliber plastic pipes according to claim 1, characterized in that: the small end of the primary welding hole (11) and the small end of the secondary welding hole (12) are opened in opposite directions.
9. A wedge welding method of large caliber plastic pipes according to claim 1, characterized in that: the small ends of the primary welding hole (11) and the secondary welding hole (12) are both arranged towards the inside of the pipe body.
10. A wedge welding method of large caliber plastic pipes according to claim 1, characterized in that: the center distance between the large ends of two adjacent primary welding holes (11) is more than 20 mm.
11. A wedge welding method of large caliber plastic pipes according to claim 1, characterized in that: the cross sections of the primary welding holes (11) and the secondary welding holes (12) are round, rectangular, elliptic or regular polygon.
12. A wedge welding method of large caliber plastic pipes according to claim 1, characterized in that: the small ends of the primary taper pin rod (13) and the secondary taper pin rod (14) are respectively provided with a pulling part (15) for pulling the axial movement of the primary taper pin rod and the secondary taper pin rod.
13. The utility model provides a wedge butt fusion structure of heavy-calibre plastic tubing, is coaxial, is angle or intersecting connection, and is two sections or multistage body with the plastics material, its characterized in that: the joint of the connected first pipe body (101) and the second pipe body (102) is welded by the wedge-shaped welding method of the large-caliber plastic pipe as claimed in any one of claims 1-12 to form the connector (10).
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| CN201910651178.5A CN110260078B (en) | 2019-07-18 | 2019-07-18 | Wedge-shaped welding method and welding structure of large-caliber plastic pipe |
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| CN201910651178.5A CN110260078B (en) | 2019-07-18 | 2019-07-18 | Wedge-shaped welding method and welding structure of large-caliber plastic pipe |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0419494A (en) * | 1990-05-11 | 1992-01-23 | Kubota Corp | Electric fusion joint |
| JPH06265083A (en) * | 1993-03-05 | 1994-09-20 | Tokyo Gas Co Ltd | Electric fusion pipe coupling, joining method therefor, and anti-slip-off member used therefor |
| JPH08312869A (en) * | 1995-05-22 | 1996-11-26 | Mitsui Petrochem Ind Ltd | Fixation method for pipe at welding of pipe joint and pipe, and cutting tool for pipe |
| CN105333261A (en) * | 2015-11-25 | 2016-02-17 | 南京晨光复合管工程有限公司 | Bolt fastened type ocean high-pressure reinforced thermoplastic pipe (RTP) connector and assembling method thereof |
| CN210566918U (en) * | 2019-07-18 | 2020-05-19 | 王子艺 | Wedge-shaped welding structure of large-diameter plastic pipe |
-
2019
- 2019-07-18 CN CN201910651178.5A patent/CN110260078B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0419494A (en) * | 1990-05-11 | 1992-01-23 | Kubota Corp | Electric fusion joint |
| JPH06265083A (en) * | 1993-03-05 | 1994-09-20 | Tokyo Gas Co Ltd | Electric fusion pipe coupling, joining method therefor, and anti-slip-off member used therefor |
| JPH08312869A (en) * | 1995-05-22 | 1996-11-26 | Mitsui Petrochem Ind Ltd | Fixation method for pipe at welding of pipe joint and pipe, and cutting tool for pipe |
| CN105333261A (en) * | 2015-11-25 | 2016-02-17 | 南京晨光复合管工程有限公司 | Bolt fastened type ocean high-pressure reinforced thermoplastic pipe (RTP) connector and assembling method thereof |
| CN210566918U (en) * | 2019-07-18 | 2020-05-19 | 王子艺 | Wedge-shaped welding structure of large-diameter plastic pipe |
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| CN110260078A (en) | 2019-09-20 |
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