CN111347679A - Small PPR pipe welding device and welding method - Google Patents
Small PPR pipe welding device and welding method Download PDFInfo
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- CN111347679A CN111347679A CN202010212311.XA CN202010212311A CN111347679A CN 111347679 A CN111347679 A CN 111347679A CN 202010212311 A CN202010212311 A CN 202010212311A CN 111347679 A CN111347679 A CN 111347679A
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- ppr pipe
- sleeve
- ppr
- vertical plate
- welding
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- 238000003466 welding Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 56
- 230000006698 induction Effects 0.000 claims abstract description 45
- 230000008878 coupling Effects 0.000 claims abstract description 22
- 238000010168 coupling process Methods 0.000 claims abstract description 22
- 238000005859 coupling reaction Methods 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 8
- 230000007246 mechanism Effects 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 abstract description 4
- 230000008018 melting Effects 0.000 abstract description 4
- 229910052759 nickel Inorganic materials 0.000 description 9
- 239000012943 hotmelt Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Images
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
- B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
-
- 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
- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
- B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
- B29C65/7805—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features
-
- 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
- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
- B29C65/7841—Holding or clamping means for handling purposes
-
- 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
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
-
- 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
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/65—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles with a relative motion between the article and the welding tool
-
- 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
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/14—Copolymers of polypropylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
A welding device and a welding method for a small PPR pipe are disclosed, wherein a high-frequency heater and an induction coil are arranged in a base; the upper end surface of the base is provided with a vertical plate, a fixed clamp, a connecting rod, a connecting sleeve and a telescopic handle; the vertical plate is fixedly connected to one end of the base and is provided with a conical through hole which is coaxial with the induction coil; the fixed clamp is positioned at one end opposite to the vertical plate, the connecting rod is transversely arranged, and one end of the connecting rod is connected with the vertical plate; the connecting sleeve is sleeved outside the connecting rod, and the other end of the connecting sleeve, which is far away from the connecting rod, penetrates through the fixing clamp; the PPR pipe penetrates through the vertical plate, one end of the PPR pipe is clamped with the conical through hole, and the other end of the PPR pipe is sleeved with a nickel wire welding net sleeve and then penetrates into the heating coil; one end of the PPR pipe joint is clamped in the fixed clamp, and the other end of the PPR pipe joint is close to the nickel wire welding net sleeve; the fixing clamp enables the connecting sleeve to be linked with the PPR pipe joint; the method comprises the following steps: utilize induction heating principle, induction coil is indirect to PPR pipe heating and melting back, accomplishes the welding with PPR coupling welding into PPR pipe through telescopic drive. The welding device and the welding method simplify the operation process and have high safety.
Description
Technical Field
The invention relates to a small PPR pipe welding device and method.
Background
The PPR pipe which is the most common material in building engineering and is also called a three-type polypropylene pipe has the advantages of environmental protection, light weight, high strength, corrosion resistance, smooth inner wall, no scaling, long service life and the like, and is widely applied to building water supply and drainage, urban and rural water supply and drainage, urban gas, electric power and optical cable sheaths, industrial fluid delivery, agricultural irrigation and the like.
At present, PPR pipe connection modes mainly include: hot melt connection, electric melting connection, flange connection, mechanical connection and clamping sleeve connection. The hot melt connection is a connection mode that a special heating tool is adopted to heat and melt a connection part, and then pressure is applied to connect the connection part into a whole. Because the connection points are made of the same material, the connection quality is reliable, and in addition, other special material accessories are not needed, so that the connection device is widely adopted.
However, the existing hot-melt connection method also has obvious defects, which are shown as follows: PPR pipe hot melt is connected mainly adopts the manual operation mode, during the welding, hand cooperation work about needs, pushes welding tool's heating position both sides simultaneously with PPR pipe tip and PPR coupling, extracts simultaneously behind the hot melt, is in the same place two tube head butt welds again, and operating procedure is loaded down with trivial details, and because hot melt instrument keeps the temperature about 300 ℃ throughout in welding process, manual operation is scalded very easily, consequently still has certain danger.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a welding device and a welding method for a small-sized PPR pipe, which can simplify the welding operation process, conveniently weld the PPR pipe and reduce the risk of scalding the operation worker in the welding process.
In order to achieve the purpose, the invention provides a small PPR pipe welding device, which comprises a base, wherein a high-frequency induction heater is arranged in the base, and an induction coil is connected with the high-frequency induction heater through a through hole formed in the upper end surface of the base;
the upper end surface of the base is provided with a clamping mechanism, and the clamping mechanism comprises a vertical plate, a fixed clamp, a connecting rod and a connecting sleeve, wherein the connecting rod and the connecting sleeve are arranged between the vertical plate and the fixed clamp; the vertical plate is fixedly connected to one end of the base, and a conical through hole coaxial with the induction coil is formed in the vertical plate;
the fixing clamp is positioned at one end of the base opposite to the vertical plate and comprises a middle connecting part, and a clamp opening I and a clamp opening II which are positioned at two sides of the connecting part; the induction coil is positioned between the vertical plate and the first clamp opening;
the connecting rod is transversely arranged, one end of the connecting rod is connected with the vertical plate, and the other end of the connecting rod is sleeved with a spring in sliding fit with the vertical plate;
the connecting sleeve is sleeved outside the connecting rod, and the other end of the connecting sleeve, which is far away from the connecting rod, penetrates through the second clamp opening; a spring limiting block is arranged on the inner wall of one end of the connecting sleeve matched with the connecting rod;
a horizontal pull rod is arranged in the connecting rod cavity along the length direction of the connecting rod cavity, one end of the horizontal pull rod is connected with the retraction handle, the other end of the horizontal pull rod penetrates through the connecting rod cavity for a certain distance and then is connected with a longitudinal pull rod vertically arranged in the connecting sleeve, and both ends of the longitudinal pull rod are fixedly connected with the inner wall of the connecting sleeve;
one end of the spring is pressed against the end face of the longitudinal pull rod, and the other end of the spring is pressed against the spring limiting block;
one side of the connecting rod is provided with a shrinkage handle mounting groove communicated with the interior of the cavity;
the PPR pipe transversely penetrates through the vertical plate from the conical through hole, one end of the PPR pipe is tightly matched with the conical through hole through a conical rubber plug in a clamping manner, and the other end of the PPR pipe is sleeved with a nickel wire welding net sleeve and then penetrates into the induction coil;
one end of the PPR pipe joint is clamped in the first clamp opening, the other end of the PPR pipe joint is close to the nickel wire welding net sleeve, and the inner diameter of the PPR pipe joint is slightly larger than the outer diameter of the nickel wire welding net sleeve;
connecting sleeve is parallel with PPR coupling axis, and mounting fixture's intermediate junction portion is located between connecting sleeve and the PPR coupling, makes connecting sleeve and PPR coupling linkage.
Furthermore, the first clamp opening and the second clamp opening are formed by connecting the two clamping plates through a connecting shaft in a cross connection mode, semicircular grooves matched with the outer diameter of the PPR pipe joint and the outer diameter of the connecting sleeve are formed in the two ends of each clamping plate respectively, a locking pull buckle is arranged at one end, far away from the middle connecting shaft, of the first clamp opening, one end of the locking pull buckle is connected with the upper clamping plate, and the other end of the locking pull buckle is connected with the lower clamping plate.
Furthermore, the end part of the nickel wire welding net sleeve is provided with an inward-folding section.
This device is through installation high frequency induction heater in the base, base up end installation fixture, it forms linkage structure to make connecting sleeve and PPR coupling through the mounting fixture among the fixture, heat nickel wire welding screen cover through induction coil, when beginning to melt with the PPR pipe of nickel wire welding screen cover contact segment, through applying the bond tension to the journey handle that contracts, drive PPR coupling to PPR pipe direction and remove, and force PPR pipe to press into in the PPR coupling, the in-process that heats at induction coil lies in its inboard PPR pipe and the PPR coupling that lies in its outside all can melt, with reaching the welded purpose, and avoided the direct hand contact hot melt tube head of operation workman at the welded in-process, prevented the emergence of the danger of being scalded, the device convenient operation, can convenient quick welding construction.
A welding method of a small PPR pipe comprises the following steps:
(1) one end of a PPR pipe to be welded penetrates through a conical through hole formed in the vertical plate, is sleeved with a nickel wire welding net sleeve and then extends into the induction coil, the rubber sleeve is plugged into the conical through hole after the adjustment is in place, and the PPR pipe is pulled backwards to form a self-locking self-anchor;
(2) fixing one end of the PPR pipe joint to be welded in the first clamp opening, tightening and locking the pull buckle after the other end of the PPR pipe joint is close to the nickel wire welding net sleeve, and simultaneously clamping the PPR pipe joint and the connecting sleeve by the fixing clamp;
(3) starting a button of a high-frequency induction heater, starting heating of a nickel wire welding net sleeve by an induction coil, enabling the nickel wire welding net sleeve to transfer heat to the end part of a PPR pipe contacted with the nickel wire welding net sleeve, when the end part of the PPR pipe begins to melt, holding a retraction handle and applying tension, enabling the retraction handle to drive a longitudinal pull rod through a horizontal pull rod, enabling the longitudinal pull rod to drive a connecting sleeve to move towards a vertical plate, enabling the connecting sleeve to move to drive a PPR pipe joint connected with the connecting sleeve through a fixing clamp to move in the same direction with the PPR pipe joint, gradually welding the PPR pipe with the nickel wire welding net sleeve into the PPR pipe joint, and closing the high-frequency heater when the length of an overlapped section reaches 8;
(4) continuously applying pressure to the shrinkage handle, continuously driving the PPR pipe joint to move in the same direction with the PPR pipe joint by the connecting sleeve, continuously pressing the PPR pipe and the nickel wire welding net sleeve into the PPR pipe joint by utilizing waste heat, and finishing welding when the length of the overlapped section reaches 15 mm; the locking pull buckle is loosened, the retraction handle is loosened, and the connecting sleeve is pushed to return under the action of the return elasticity of the spring;
(5) and taking down the conical rubber sleeve in the conical through hole, and taking out the PPR pipe and the PPR pipe joint which are welded from the conical through hole to finish the whole construction process.
Further, the heating temperature in the step (3) is 260-300 ℃.
The method utilizes the induction heating principle, heats the induction coil through the high-frequency induction heater, heats and melts the PPR pipe indirectly through the nickel wire welding net sleeve, and then welds the PPR pipe joint sleeve on the outer part of the PPR pipe by applying pulling force to the shrinkage handle, thereby completing the welding. This welding has effectively prevented the dangerous emergence of being scalded, and operation flow is simple and convenient, and difficult welding is askew, can convenient quick welding construction.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the clamping mechanism;
FIG. 3 is a schematic view of the mating structure of the holding clip with the coupling sleeve and the PPR pipe joint;
fig. 4 is a schematic structural view of a nickel wire welded mesh.
In the figure: 1. the base, 2, induction coil, 3, the riser, 4, mounting fixture, 5, the connecting rod, 6, the connecting sleeve, 7, the toper through-hole, 8, anchor clamps mouth one, 9, anchor clamps mouth two, 10, the spring, 11, the spring stopper, 12, horizontal pull rod, 13, the journey handle that contracts, 14, vertical pull rod, 15, the journey handle mounting groove that contracts, 16, PPR pipe, 17, nickel silk welding net cover, 18, PPR coupling, 19, the button, 20, the locking is drawn and is detained, 21, go up the grip block, 22, lower grip block.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1 to 4, a small PPR pipe welding device comprises a base 1, a high-frequency induction heater is installed in the base 1, and an induction coil 2 is connected with the high-frequency induction heater through a through hole formed in the upper end surface of the base 1;
wherein the induction coil 2 belongs to a part of the high-frequency induction heater;
the upper end face of the base 1 is provided with a clamping mechanism, and the clamping mechanism comprises a vertical plate 3, a fixed clamp 4, a connecting rod 5 and a connecting sleeve 6, wherein the connecting rod 5 and the connecting sleeve 6 are arranged between the vertical plate 3 and the fixed clamp 4; the vertical plate 3 is fixedly connected to one end of the base, and a conical through hole 7 which is coaxial with the induction coil 2 is formed in the vertical plate 3;
the fixed clamp 4 is positioned at the other end of the base opposite to the vertical plate 3, and the fixed clamp 4 comprises a middle connecting part, and a clamp opening I8 and a clamp opening II 9 which are positioned at two sides of the connecting part; the induction coil 2 is positioned between the vertical plate 3 and the first clamp opening 9;
the connecting rod 5 is transversely arranged, one end of the connecting rod is connected with the vertical plate 3, and the other end of the connecting rod is sleeved with a spring 10 in sliding fit with the vertical plate;
the connecting sleeve 6 is sleeved outside the connecting rod 5, and the other end of the connecting sleeve, which is far away from the connecting rod 5, penetrates through the second clamp opening 9; a spring limiting block 11 is arranged on the inner wall of one end of the connecting sleeve 6 matched with the connecting rod 5;
a horizontal pull rod 12 is arranged in the cavity of the connecting rod 5 along the length direction of the cavity, one end of the horizontal pull rod 12 is connected with an external telescopic handle 13, the other end of the horizontal pull rod 12 penetrates through the cavity of the connecting rod 5 for a certain distance and then is connected with a longitudinal pull rod 14 vertically arranged in the connecting sleeve 6, and two ends of the longitudinal pull rod 14 are fixedly connected with the inner wall of the connecting sleeve 6;
one end of the spring 10 is pressed against the end face of the longitudinal pull rod 14, and the other end of the spring is pressed against the spring limiting block 11;
one side of the connecting rod 5 is provided with a shrinkage handle mounting groove 15 communicated with the inside of the cavity;
the PPR pipe 16 transversely penetrates through the vertical plate 3 from the conical through hole 7, one end of the PPR pipe is tightly matched with the conical through hole 7, and the other end of the PPR pipe is sleeved with a nickel wire welding net sleeve 17 and then penetrates into the induction coil;
one end of the PPR pipe joint 18 is clamped in the first clamp opening 8, the other end of the PPR pipe joint is close to the nickel wire welding net sleeve 17, and the inner diameter of the PPR pipe joint 18 is slightly larger than the outer diameter of the nickel wire welding net sleeve 17;
connecting sleeve 6 is parallel with PPR coupling 18 axis, and the intermediate junction portion of mounting fixture 4 is located between connecting sleeve 6 and PPR coupling 18, makes connecting sleeve 6 and PPR coupling 18 interlock.
As a preferred form, the first clamp opening 8 and the second clamp opening 9 are formed by connecting two clamping plates in a cross manner through a connecting shaft, semicircular grooves matched with the outer diameter of the PPR pipe joint 18 and the outer diameter of the connecting sleeve 6 are formed in two ends of each clamping plate respectively, a locking pull buckle 20 is arranged at one end of the first clamp opening 8, which is far away from the middle connecting shaft, one end of the locking pull buckle 20 is connected with the upper clamping plate 21, and the other end of the locking pull buckle is connected with the lower clamping plate 22.
For guaranteeing that nickel silk welding net cover 17 does not take place the displacement with PPR pipe 16's connection position, not influenced by external force during the welding, nickel silk welding net cover 17 tip be equipped with the infolding section, similar bottle lid top cavity shape of nickel silk welding net cover 17, 0.2mm is directly got to the nickel silk, net density 20 meshes, the net cover height 10mm, tip infolding 0.3mm, according to PPR pipe 16's internal diameter size, the internal diameter of nickel silk welding net cover 17 is greater than PPR pipe 16 internal diameter 1mm can.
Make PPR coupling 18 and connecting rod sleeve 6 form linkage structure through mounting fixture 4, heat nickel wire welding net cover 17 through induction coil 2, PPR pipe 16 when with nickel wire welding net cover 17 contact part begins to melt, through applying the bond wrap pulling force to shrink journey handle 13, connecting sleeve 6 compression spring 10, drive PPR coupling 18 and move to PPR pipe 16 direction, and will be more thin section PPR pipe 16 impresses in thick section PPR coupling 18, locate in the process of induction coil 2 heating its inboard thinner section PPR pipe 16 and be located its outside thick section PPR coupling 18 and all can melt, in order to reach the welded mesh.
A welding method of a small PPR pipe comprises the following steps:
(1) one end of a PPR pipe 16 to be welded penetrates through a conical through hole 7 formed in the vertical plate 3, a nickel wire welding net sleeve 17 is sleeved on the PPR pipe, then the PPR pipe extends into the induction coil 2, the PPR pipe 16 is adjusted in place, a rubber sleeve is plugged into the conical through hole 7, and the PPR pipe 16 is pulled backwards to form a self-locking self-anchor;
(2) fixing one end of a PPR pipe joint 18 to be welded in the first clamp opening 8, tightening the locking pull buckle 20 after the other end is close to the nickel wire welding net sleeve 17, and simultaneously clamping the PPR pipe joint 18 and the connecting sleeve 6 by the fixing clamp 4;
(3) starting a high-frequency induction heater button 19, starting heating of a nickel wire welding mesh sleeve 17 by an induction coil 2, enabling the nickel wire welding mesh sleeve 17 to transfer heat to the end portion of a PPR pipe 16 in contact with the nickel wire welding mesh sleeve, when the end portion of the PPR pipe 16 begins to melt, holding a retraction handle 13 and applying tension, enabling the retraction handle 13 to drive a longitudinal pull rod 14 through a horizontal pull rod 12, enabling the longitudinal pull rod 14 to drive a connecting sleeve 6 to move towards a vertical plate 3, enabling the connecting sleeve 6 to move to drive a PPR pipe joint 18 connected with the connecting sleeve through a fixing clamp 4 to move in the same direction with the connecting sleeve, gradually welding the PPR pipe 16 with the nickel wire welding mesh sleeve 17 into the PPR pipe joint 18, and closing the high-frequency heater when the length of a lap joint reaches 8-12;
(4) continuously applying pulling force to the shrinkage handle 13, continuously driving the PPR pipe joint 18 to move in the same direction with the shrinkage handle by the connecting sleeve 6, continuously pressing the PPR pipe 16 and the nickel wire welding net sleeve 17 into the PPR pipe joint 18 by utilizing waste heat, and finishing welding when the length of the overlapped section reaches 15 mm; the locking pull buckle 20 is loosened, the retraction handle 13 is loosened, and the connecting sleeve 6 is pushed to return under the action of the return elasticity of the spring 10;
(5) and (3) taking off the conical rubber sleeve in the conical through hole 7, and taking out the PPR pipe 16 and the PPR pipe joint 18 which are welded from the conical through hole 7 to finish the whole construction process.
In order to ensure the welding effect, the heating temperature in the step (3) is 260-300 ℃.
In the invention, a 24V20A power supply is adopted for a high-frequency induction heating circuit, and the power is about 500W; the nickel metal of preparation nickel silk welding wire netting not only can carry out fine heating and heat conduction, and its stability in the air is very high, has better acid and corrosion resistance, requires the welding material of ideal under the higher condition of environmental protection to the PPR feed pipe, and more importantly, this nickel silk welding wire netting is preserved between PPR pipe and PPR coupling after the welding is accomplished, has increased the frictional force between the two, has extremely improved welded fastness effectively.
The invention utilizes the induction heating principle on the premise of keeping the mature and reliable welding of the traditional hot melting technology, ensures the safety and the quick construction, heats the metal material by the high-frequency induction principle, does not directly heat the PPR material, is different from the traditional PPR direct heating welding equipment, and also has the advantage of firm welding by the hot melting method.
Claims (5)
1. A small PPR pipe welding device comprises a base (1) and is characterized in that a high-frequency induction heater is installed in the base (1), and an induction coil (2) is connected with the high-frequency induction heater through a through hole formed in the upper end face of the base (1);
the upper end face of the base (1) is provided with a clamping mechanism, and the clamping mechanism comprises a vertical plate (3), a fixed clamp (4), a connecting rod (5) and a connecting sleeve (6) which are arranged between the vertical plate (3) and the fixed clamp (4); the vertical plate (3) is fixedly connected to one end of the base (1), and a conical through hole (7) which is coaxial with the induction coil (2) is formed in the vertical plate (3);
the fixed clamp (4) is positioned at the other end of the base (1) opposite to the vertical plate (3), and the fixed clamp (4) comprises a middle connecting part, and a first clamp opening (8) and a second clamp opening (9) which are positioned at two sides of the connecting part; the induction coil (2) is positioned between the vertical plate (3) and the first clamp opening (8);
the connecting rod (5) is transversely arranged, one end of the connecting rod is connected with the vertical plate (3), and the other end of the connecting rod is sleeved with a spring (10) in sliding fit with the vertical plate;
the connecting sleeve (6) is sleeved outside the connecting rod (5), and the other end of the connecting sleeve, which is far away from the connecting rod (5), penetrates through the second clamp opening (9); a spring limiting block (11) is arranged on the inner wall of one end of the connecting sleeve (6) matched with the connecting rod (5);
a horizontal pull rod (12) is arranged in the cavity of the connecting rod (5) along the length direction of the cavity, one end of the horizontal pull rod (12) is connected with a telescopic handle (13), the other end of the horizontal pull rod penetrates through the cavity of the connecting rod (5) for a certain distance and then is connected with a longitudinal pull rod (14) vertically arranged in the connecting sleeve (6), and two ends of the longitudinal pull rod (14) are fixedly connected with the inner wall of the connecting sleeve (6);
one end of the spring (10) is pressed against the end surface of the longitudinal pull rod (14), and the other end of the spring (10) is pressed against the spring limiting block (11);
one side of the connecting rod (5) is provided with a shrinkage handle mounting groove (15) communicated with the interior of the cavity;
the PPR pipe (16) transversely penetrates through the vertical plate (3) from the conical through hole (7), one end of the PPR pipe is tightly matched with the conical through hole (7) through a conical rubber plug, and the other end of the PPR pipe is sleeved with a nickel wire welding net sleeve (17) and then penetrates into the induction coil (2);
one end of the PPR pipe joint (18) is clamped in the first clamp opening (8), the other end of the PPR pipe joint is close to the nickel wire welding net sleeve (17), and the inner diameter of the PPR pipe joint (18) is slightly larger than the outer diameter of the nickel wire welding net sleeve (17);
connecting sleeve (6) are parallel with PPR coupling (18) axis, and the intermediate junction portion of mounting fixture (4) is located between connecting sleeve (6) and PPR coupling (18), makes connecting sleeve (6) and PPR coupling (18) linkage.
2. The small-sized PPR pipe welding device according to claim 1, wherein the first clamp opening (8) and the second clamp opening (9) are formed by connecting two clamping plates through a connecting shaft in a cross manner, semicircular grooves matched with the outer diameter of the PPR pipe joint (18) and the outer diameter of the connecting sleeve (6) are formed in the two ends of each clamping plate respectively, a locking pull buckle (20) is arranged at one end, far away from the middle connecting shaft, of the first clamp opening (8), one end of the locking pull buckle (20) is connected with the upper clamping plate (21), and the other end of the locking pull buckle is connected with the lower clamping plate (22).
3. The small-sized PPR pipe welding device according to claim 1 or 2, wherein the end of the nickel wire welding net sleeve (17) is provided with an inward-folded section.
4. A welding method of a small PPR pipe is characterized by comprising the following steps:
(1) one end of a PPR pipe (16) to be welded penetrates through a conical through hole (7) formed in a vertical plate (3), a nickel wire welding net sleeve (17) is sleeved on the PPR pipe and then extends into an induction coil (2), the PPR pipe is adjusted in place and then a rubber sleeve is plugged into the conical through hole (7), and the PPR pipe (16) is pulled backwards to form a self-locking self-anchor;
(2) one end of a PPR pipe joint (18) to be welded is fixed in the first clamp opening (8), after the other end of the PPR pipe joint is close to the nickel wire welding net sleeve (17), a locking pull buckle (20) is tightened, and at the moment, the PPR pipe joint (18) and the connecting sleeve (6) are clamped tightly by the fixing clamp (4);
(3) starting a button (19) of a high-frequency induction heater, heating a nickel wire welding mesh sleeve (17) by an induction coil (2), transferring heat to the end part of a PPR pipe (16) contacted with the nickel wire welding mesh sleeve (17), holding a retraction handle (13) and applying pulling force when the end part of the PPR pipe (16) begins to melt, driving a longitudinal pull rod (14) by the retraction handle (13) through a horizontal pull rod (12), driving a connecting sleeve (6) to move towards a vertical plate (3), driving a PPR pipe joint (18) connected with the connecting sleeve through a fixing clamp (4) to move in the same direction with the vertical pull rod (14) by the longitudinal pull rod (14), gradually welding the PPR pipe (16) with the nickel wire welding mesh sleeve (17) into the PPR pipe joint (18), and closing the high-frequency heater when the length of a lap joint reaches 8-12 mm;
(4) continuously applying pulling force to the shrinkage handle (13), continuously driving the PPR pipe joint (18) to move in the same direction with the shrinkage handle by the connecting sleeve (6), continuously pressing the PPR pipe (16) and the nickel wire welding net sleeve (17) into the PPR pipe joint (18) by utilizing waste heat, and finishing welding when the length of the overlapped section reaches 15 mm; the locking pull buckle (20) is loosened, the retraction handle (13) is loosened, and the connecting sleeve (6) is pushed to return under the action of the return elasticity of the spring (10);
(5) and taking down the conical rubber sleeve in the conical through hole (7), and taking out the PPR pipe (16) and the PPR pipe joint (18) which are welded from the conical through hole (7) to finish the whole construction process.
5. The welding method of the small PPR pipe according to claim 4, wherein the heating temperature in step (3) is 260-300 ℃.
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| CN115091765A (en) * | 2022-05-25 | 2022-09-23 | 长春亚大汽车零件制造有限公司 | Non-metal pipeline and joint induction type welding method and device |
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