CN111347679B - Small PPR pipe welding device and welding method - Google Patents
Small PPR pipe welding device and welding method Download PDFInfo
- Publication number
- CN111347679B CN111347679B CN202010212311.XA CN202010212311A CN111347679B CN 111347679 B CN111347679 B CN 111347679B CN 202010212311 A CN202010212311 A CN 202010212311A CN 111347679 B CN111347679 B CN 111347679B
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- ppr pipe
- sleeve
- pipe joint
- vertical plate
- connecting rod
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- 238000003466 welding Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 23
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 48
- 230000006698 induction Effects 0.000 claims abstract description 47
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000010276 construction Methods 0.000 claims description 7
- 230000008602 contraction Effects 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 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
- 239000000155 melt Substances 0.000 abstract description 2
- 239000012943 hotmelt Substances 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 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
- 229910052759 nickel Inorganic materials 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
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 of a small PPR pipe are provided, 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 stroke shrinking handle; the vertical plate is fixedly connected to one end of the base and provided with a conical through hole coaxially arranged 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, passes through the fixing clamp; the PPR pipe passes 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 is close to the nickel wire welding net sleeve; the connecting sleeve is linked with the PPR pipe joint through the fixing clamp; the method comprises the following steps: after the induction coil indirectly heats and melts the PPR pipe by utilizing the induction heating principle, the PPR pipe joint is welded into the PPR pipe by the driving of the sleeve to finish welding. The welding device and the welding method simplify the operation procedure and have high safety.
Description
Technical Field
The invention relates to a small PPR pipe welding device and method.
Background
The PPR pipe, also called as a three-type polypropylene pipe, is the most common material in the construction engineering, 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 fuel gas, electric power and optical cable jackets, industrial fluid transportation, agricultural irrigation and the like.
At present, the PPR pipe connection mode mainly comprises the following steps: hot melt connection, electrofusion connection, flange connection, mechanical connection and clamping sleeve connection. The hot melting connection is a connection mode that a special heating tool is adopted to heat the connection part to melt the connection part, and then the connection part is pressed and connected into a whole. The connecting point is made of the same material, so that the connecting quality is reliable, and no other special material fittings are needed, so that the connecting point is widely used.
However, the existing hot melt connection mode has obvious defects, which are expressed as follows: the PPR pipe hot-melt connection mainly adopts manual operation mode, and during the welding, needs control hand collaborative work, pushes the heating position both sides of welding tool with PPR pipe tip and PPR coupling simultaneously, pulls out simultaneously after the hot melt, and is in the same place two tube heads butt welding again, and operation process is loaded down with trivial details, and because the welding in-process hot-melt tool remains the temperature around 300 ℃ throughout, manual operation is scalded very easily, consequently still has certain danger.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a small-sized PPR pipe welding device and a method, which can simplify the welding operation procedure, conveniently weld the PPR pipe and reduce the scalding risk of operators in the welding process.
In order to achieve the above 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 face of the base is provided with a clamping mechanism, and the clamping mechanism comprises a vertical plate, a fixing clamp and a connecting rod and a connecting sleeve which are arranged between the vertical plate and the fixing clamp; the vertical plate is fixedly connected to one end of the base, and a conical through hole which is coaxially arranged 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, 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 connecting rod;
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, passes through the second clamp opening; a spring limiting block is arranged on the inner wall of one end of the connecting sleeve, which is 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 shrinkage Cheng Bashou, the other end of the horizontal pull rod penetrates out of the connecting rod cavity for a certain distance and then is connected with a longitudinal pull rod vertically arranged in the connecting sleeve, and two ends of the longitudinal pull rod are fixedly connected with the inner wall of the connecting sleeve;
One end of the spring is propped against the end face of the longitudinal pull rod, and the other end of the spring is propped against the spring limiting block;
One side of the connecting rod is provided with a telescopic handle mounting groove communicated with the inside of the cavity;
the PPR pipe transversely passes through the vertical plate from the conical through hole, one end of the PPR pipe is tightly matched with the conical through hole through the conical rubber plug, 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;
The connecting sleeve is parallel to the axis of the PPR pipe joint, and the middle connecting part of the fixing clamp is positioned between the connecting sleeve and the PPR pipe joint, so that the connecting sleeve and the PPR pipe joint are linked.
Further, the first clamp opening and the second clamp opening are formed by connecting two clamping plates through connecting shafts in a cross mode, semicircular grooves which are respectively matched with the outer diameter of the PPR pipe joint and the outer diameter of the connecting sleeve are formed in two ends of each clamping plate, a locking buckle is arranged at one end, far away from the connecting shaft in the middle, of the first clamp opening, one end of the locking buckle is connected with the upper clamping plate, and the other end of the locking buckle is connected with the lower clamping plate.
Further, the end part of the nickel wire welding net sleeve is provided with an inward folded section.
This device is through installing high frequency induction heater in the base, base up end installation fixture, make connecting sleeve and PPR coupling form the linkage structure through mounting fixture in the fixture, through induction coil to nickel wire welding net cover heating, when the PPR pipe that contacts the part with nickel wire welding net cover begins to melt, through exerting the bond pulling force to the stroke handle, drive PPR coupling to PPR pipe direction removal, and force PPR pipe to impress in the PPR coupling, the PPR pipe that is located its inboard and the PPR coupling that is located its outside all can melt at the in-process of induction coil heating, in order to reach welded purpose, and avoided the direct hand contact hot melt tube head of operating personnel at welded in-process, the dangerous emergence of being scalded has been prevented, 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 passes 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 being adjusted in place, and a self-locking self-anchor is formed by pulling the PPR pipe;
(2) One end of the PPR pipe joint to be welded is fixed in the first clamp opening, after the other end is close to the nickel wire welding net sleeve, the locking buckle is tensioned, and at the moment, the PPR pipe joint and the connecting sleeve are clamped by the fixing clamp at the same time;
(3) Starting a high-frequency induction heater button, starting heating a nickel wire welding net sleeve by an induction coil, transferring heat to the end part of a PPR pipe in contact with the nickel wire welding net sleeve by the nickel wire welding net sleeve, holding a stroke shrinking handle and applying pulling force when the end part of the PPR pipe starts to melt, driving a longitudinal pull rod by the stroke shrinking handle through a horizontal pull rod, driving a connecting sleeve to move towards a vertical plate by the longitudinal pull rod, driving a PPR pipe joint connected with the connecting sleeve through a fixing clamp to move in the same direction by the connecting sleeve, 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 a lap joint section reaches 8-12 mm;
(4) Continuously applying pressure to the contraction handle, continuously driving the PPR pipe joint and the PPR pipe joint to move in the same direction 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 lap joint section reaches 15 mm; releasing the locking buckle, releasing the shrinkage Cheng Bashou, and pushing the connecting sleeve to return under the action of return elastic force of the spring;
(5) Taking down the conical rubber sleeve in the conical through hole, taking out the welded PPR pipe and the PPR pipe joint from the conical through hole, and completing the whole construction process.
Further, the heating temperature in the step (3) is 260 to 300 ℃.
The method utilizes the induction heating principle, the induction coil is heated by the high-frequency induction heater, the induction coil indirectly heats and melts the PPR pipe by the nickel wire welding net sleeve, and the PPR pipe joint is sleeved outside the PPR pipe by applying a pulling force to the contraction handle, so that the welding is completed. The welding effectively prevents the occurrence of the risk of being scalded, has simple and convenient operation flow, is not easy to weld askew, and can be used for welding construction conveniently and rapidly.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a cross-sectional view of the clamping mechanism;
FIG. 3 is a schematic diagram of the mating structure of the fixture and the connecting sleeve and the PPR pipe joint;
Fig. 4 is a schematic structural view of a nickel wire welded mesh.
In the figure: 1. the device comprises a base, 2, an induction coil, 3, a vertical plate, 4, a fixed clamp, 5, a connecting rod, 6, a connecting sleeve, 7, a conical through hole, 8, a first clamp opening, 9, a second clamp opening, 10, a spring, 11, a spring limiting block, 12, a horizontal pull rod, 13, a stroke handle, 14, a longitudinal pull rod, 15, a stroke handle mounting groove, 16, a PPR pipe, 17, a nickel wire welding net sleeve, 18, a PPR pipe joint, 19, a button, 20, a locking pull buckle, 21, an upper clamping plate, 22 and a lower clamping plate.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 4, a small PPR pipe welding device comprises a base 1, wherein a high-frequency induction heater is arranged 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 is part of a high frequency induction heater;
The upper end face of the base 1 is provided with a clamping mechanism which 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 coaxially arranged 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, 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 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 which is in sliding fit with the connecting rod;
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, passes 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 connecting rod, one end of the horizontal pull rod 12 is connected with an external 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 propped against the end face of the longitudinal pull rod 14, and the other end is propped against the spring limiting block 11;
one side of the connecting rod 5 is provided with a telescopic handle mounting groove 15 communicated with the inside of the cavity;
The PPR pipe 16 transversely passes through the vertical plate 3 from the conical through hole 7, one end of the PPR pipe is in clamping fit 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;
The connecting sleeve 6 is parallel to the axis of the PPR pipe joint 18, and the middle connecting part of the fixing clamp 4 is positioned between the connecting sleeve 6 and the PPR pipe joint 18, so that the connecting sleeve 6 and the PPR pipe joint 18 are linked.
As a preferred form, the first clamp opening 8 and the second clamp opening 9 are formed by connecting two clamping plates through connecting shafts in a cross mode, semicircular grooves which are respectively 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, a locking 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 buckle 20 is connected with the upper clamping plate 21, and the other end of the locking buckle is connected with the lower clamping plate 22.
In order to ensure that the connection part of the nickel wire welding net sleeve 17 and the PPR pipe 16 is not displaced and is not influenced by external force during welding, the end part of the nickel wire welding net sleeve 17 is provided with an inward folding section, the nickel wire welding net sleeve 17 is similar to the hollow shape at the top of the bottle cap, the diameter of the nickel wire is 0.2mm, the mesh density is 20 meshes, the height of the net sleeve is 10mm, the end part is folded inwards by 0.3mm, and the inner diameter of the nickel wire welding net sleeve 17 is larger than the inner diameter of the PPR pipe 16 by 1mm according to the inner diameter of the PPR pipe 16.
The PPR pipe joint 18 and the connecting rod sleeve 6 form a linkage structure through the fixing clamp 4, the induction coil 2 is used for heating the nickel wire welding net sleeve 17, when the PPR pipe 16 at the contact part of the nickel wire welding net sleeve 17 begins to melt, the connecting sleeve 6 compresses the spring 10 through applying the holding tension to the contraction handle 13, the PPR pipe joint 18 is driven to move towards the PPR pipe 16, the thinner PPR pipe joint 16 is pressed into the thicker PPR pipe joint 18, and both the thinner PPR pipe 16 positioned at the inner side and the thicker PPR pipe joint 18 positioned at the outer side of the induction coil 2 are melted in the heating process of the induction coil 2 so as to achieve the purpose of welding.
A welding method of a small PPR pipe comprises the following steps:
(1) One end of a PPR pipe 16 to be welded passes through a conical through hole 7 formed in the vertical plate 3, is sleeved with a nickel wire welding net sleeve 17 and then extends into the induction coil 2, the rubber sleeve is plugged into the conical through hole 7 after being adjusted in place, and the PPR pipe 16 is pulled 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 approaches the nickel wire welding net sleeve 17, the locking buckle 20 is tightened, and at the moment, the PPR pipe joint 18 and the connecting sleeve 6 are clamped by the fixing clamp 4 at the same time;
(3) Starting a high-frequency induction heater button 19, starting heating a nickel wire welding net sleeve 17 by an induction coil 2, transferring heat to the end part of a PPR pipe 16 in contact with the nickel wire welding net sleeve 17, holding a shrinkage Cheng Bashou and applying a pulling force when the end part of the PPR pipe 16 starts to melt, driving a longitudinal pull rod 14 by a horizontal pull rod 12 by a shrinkage Cheng Bashou, driving a connecting sleeve 6 to move towards a vertical plate 3 by the longitudinal pull rod 14, driving a PPR pipe joint 18 connected with the connecting sleeve 6 by a fixing clamp 4 to move in the same direction by the connecting sleeve 6, gradually welding the PPR pipe 16 with the nickel wire welding net sleeve 17 into the PPR pipe joint 18, and closing the high-frequency heater when the length of a lap joint section reaches 8-12 mm;
(4) Continuously applying pulling force to the contraction handle 13, continuously driving the PPR pipe joint 18 and the PPR pipe joint to move in the same direction 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 using waste heat, and finishing welding when the length of the lap joint section reaches 15 mm; releasing the unlocking and tightening buckle 20, releasing the contraction handle 13, and pushing the connecting sleeve 6 to return under the action of the return elastic force of the spring 10;
(5) And taking down the conical rubber sleeve in the conical through hole 7, and taking out the welded PPR pipe 16 and PPR pipe joint 18 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 the high-frequency induction heating circuit, and the power is about 500W; the nickel metal for manufacturing the nickel wire welding net sleeve not only can be heated and conduct heat well, but also has high stability in air, better acid resistance and corrosion resistance, is an ideal welding material under the condition of high environmental protection requirement on the PPR water supply pipe, and more importantly, the nickel wire welding net sleeve is reserved between the PPR pipe and the PPR pipe joint after welding is finished, so that friction force between the PPR pipe and the PPR pipe joint is increased, and welding firmness is improved extremely effectively.
On the premise of keeping the mature and reliable welding of the traditional hot melting technology, the invention utilizes the induction heating principle, thereby ensuring the safety and the rapid construction, heating the metal material by the high-frequency induction principle, and not directly heating the PPR material, thus being different from the traditional equipment for directly heating and welding by the PPR, and taking the advantage of firm welding by the hot melting method into account.
Claims (4)
1. The small PPR pipe welding device comprises a base (1) and is characterized in that a high-frequency induction heater is arranged 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, the clamping mechanism comprises a vertical plate (3), a fixing clamp (4), and a connecting rod (5) and a connecting sleeve (6) which are arranged between the vertical plate (3) and the fixing clamp (4); the vertical plate (3) is fixedly connected to one end of the base (1), and a conical through hole (7) which is coaxially arranged with the induction coil (2) is formed in the vertical plate (3);
The fixing clamp (4) is positioned at the other end of the base (1) opposite to the vertical plate (3), and the fixing clamp (4) comprises a middle connecting part, a clamp opening I (8) 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 (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) which is in sliding fit with the connecting rod;
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), passes 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 connecting rod, one end of the horizontal pull rod (12) is connected with a telescopic handle (13), the other end of the horizontal pull rod penetrates out of 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 propped against the end face of the longitudinal pull rod (14), and the other end is propped against the spring limiting block (11);
one side of the connecting rod (5) is provided with a telescopic handle mounting groove (15) communicated with the inside of the cavity;
The PPR pipe (16) transversely passes 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);
The connecting sleeve (6) is parallel to the axis of the PPR pipe joint (18), and the middle connecting part of the fixing clamp (4) is positioned between the connecting sleeve (6) and the PPR pipe joint (18) so as to enable the connecting sleeve (6) to be in linkage with the PPR pipe joint (18);
the end part of the nickel wire welding net sleeve (17) is provided with an inward folding section, and the end part is folded inwards by 0.3mm.
2. The welding device for the small PPR pipe according to claim 1, wherein the first clamp opening (8) and the second clamp opening (9) are formed by connecting two clamping plates through connecting shafts in a cross mode, semicircular grooves which are respectively 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, a locking 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 buckle (20) is connected with the upper clamping plate (21), and the other end of the locking buckle is connected with the lower clamping plate (22).
3. A welding method of a small PPR tube welding device according to claim 1 or 2, comprising the steps of:
(1) One end of a PPR pipe (16) to be welded passes through a conical through hole (7) formed in the vertical plate (3), is sleeved with a nickel wire welding net sleeve (17) and then extends into the induction coil (2), the position is adjusted, then the rubber sleeve is plugged into the conical through hole (7), and the PPR pipe (16) is pulled to form a self-locking self-anchor;
(2) One end of a PPR pipe joint (18) to be welded is fixed in a first clamp opening (8), after the other end is close to a nickel wire welding net sleeve (17), a locking buckle (20) is tensioned, and at the moment, the PPR pipe joint (18) and a connecting sleeve (6) are clamped by a fixed clamp (4) at the same time;
(3) Starting a high-frequency induction heater button (19), heating a nickel wire welding net sleeve (17) by an induction coil (2), transferring heat to the end part of a PPR pipe (16) in contact with the nickel wire welding net sleeve (17), holding a shrinkage handle (13) and applying tension when the end part of the PPR pipe (16) begins to melt, shrinking Cheng Bashou (13) to drive a longitudinal pull rod (14) through a horizontal pull rod (12), driving a connecting sleeve (6) to move towards a vertical plate (3) by the longitudinal pull rod (14), driving a PPR pipe joint (18) connected with the connecting sleeve (6) 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 net sleeve (17) into the PPR pipe joint (18), and closing the high-frequency heater when the length of a lap joint section reaches 8-12 mm;
(4) Continuously applying pulling force to the contraction handle (13), continuously driving the PPR pipe joint (18) to move in the same direction 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 using waste heat, and finishing welding when the length of a lap joint section reaches 15 mm; releasing the locking and unlocking tension buckle (20), releasing the contraction handle (13), and pushing the connecting sleeve (6) to return under the action of return elastic force of the spring (10);
(5) And taking down the conical rubber sleeve in the conical through hole (7), and taking out the welded PPR pipe (16) and the PPR pipe joint (18) from the conical through hole (7) to finish the whole construction process.
4. A welding method according to claim 3, wherein the heating temperature in step (3) is 260 to 300 ℃.
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