CN111844768A - Anticorrosive processing equipment of steel-plastic conversion pipe - Google Patents
Anticorrosive processing equipment of steel-plastic conversion pipe Download PDFInfo
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- CN111844768A CN111844768A CN202010846812.3A CN202010846812A CN111844768A CN 111844768 A CN111844768 A CN 111844768A CN 202010846812 A CN202010846812 A CN 202010846812A CN 111844768 A CN111844768 A CN 111844768A
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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
- B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
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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
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
- B29C65/26—Hot fluid
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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
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
- B29C65/30—Electrical means
- B29C65/305—Electrical means involving the use of cartridge heaters
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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
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
- B29C65/30—Electrical means
- B29C65/32—Induction
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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
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
- B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
- B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
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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
- B29C65/66—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
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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
- 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
- B29C66/53—Joining single elements to tubular articles, hollow articles or bars
- B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
- B29C66/5324—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length
- B29C66/53241—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length said articles being tubular and said substantially annular single elements being of finite length relative to the infinite length of said tubular articles
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/74—Joining plastics material to non-plastics material
- B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
- B29C66/7428—Transition metals or their alloys
- B29C66/74283—Iron or alloys of iron, e.g. steel
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- 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
- B29L2023/22—Tubes or pipes, i.e. rigid
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- Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- Inorganic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- General Induction Heating (AREA)
Abstract
The invention belongs to the technical field of corrosion prevention of gas pipelines, and discloses an anticorrosive processing device for a steel-plastic conversion pipe, which comprises a high-pressure gas source and an electromagnetic heating device, wherein the electromagnetic heating device is provided with an air heating channel and a pipe fitting heating channel, and the air heating channel is connected with the high-pressure gas source; the electromagnetic heating device mainly comprises an electromagnetic coil and a metal heating part, and the air heating channel is arranged in the metal heating part; the metal heating part generates heat under the action of the magnetic field of the electromagnetic coil, the high-pressure air source outputs high-pressure airflow to enter the air heating channel, the high-pressure airflow is heated in the air heating channel to form high-pressure hot airflow, and the high-pressure hot airflow is sprayed to the PE anti-corrosion sleeve positioned in the pipe fitting heating channel through the spray opening in the inner wall of the pipe fitting heating channel. The invention achieves the following effects: the heating is fast, and processing pipe fitting surface quality is good, and anticorrosive sleeve pipe and steel pipe bonding effect are good, and bonding strength is even, bonding strength is big, greatly reduced processing cost, avoided naked light operation, improved the security of production greatly.
Description
Technical Field
The invention belongs to the technical field of corrosion prevention of gas pipelines, relates to an anticorrosive processing technology of a steel-plastic conversion pipe, and particularly relates to anticorrosive processing equipment suitable for a thermal shrinkage processing type 3PE anticorrosive technology.
Background
The urban natural gas pipe network consists of two pipelines, namely an underground pipeline and an above-ground pipeline, wherein the underground environment corrodes the steel pipes, so that the underground pipeline is mostly paved by adopting plastic pipes with good corrosion resistance, and the above-ground pipeline is paved by adopting the steel pipes in consideration of the fact that the plastic pipes are exposed in the air and are easy to age. The underground plastic pipe and the ground steel pipe are in conversion connection through a section of steel-plastic conversion pipe, and the steel-plastic conversion pipe is formed by coaxially connecting a section of plastic pipe and a section of steel pipe. Most of the steel-plastic conversion pipes in the whole pipe network need to be buried underground, so the steel pipe sections need to be subjected to corrosion prevention treatment.
The 3PE corrosion prevention of the steel-plastic conversion pipe mainly adopts a heat shrinkage process, a heat shrinkage sleeve is a sleeve prepared in advance, the outer layer of the heat shrinkage sleeve is radiation cross-linked polyethylene, and the inner layer of the heat shrinkage sleeve is a hot-melt polyethylene adhesive. During processing, firstly, an epoxy powder anticorrosive layer is coated on the surface of the steel pipe, then a prefabricated heat-shrinkable sleeve is sleeved on the steel pipe, the steel-plastic connecting node is sleeved with a metal hoop, the metal hoop is sleeved by the heat-shrinkable sleeve, and finally the heat-shrinkable sleeve is heated to shrink and adhere to the pipe fitting through a heated and melted adhesive.
At present, the heating mode of the anticorrosion heat shrinkable sleeve actually adopted by a factory is mainly baking by artificial fire, and the main defects are that 1, the heating is uneven, so that the bonding strength of different parts between the sleeve and the steel pipe is seriously uneven, the surface is uneven, and the appearance is ugly; 2. bubbles are easily formed inside; 3. the temperature is difficult to control, and if the sleeve is easily burnt carelessly, the requirement on the proficiency of workers is high; 4. safety accidents and burns easily occur under open fire operation, and great hidden dangers exist.
Although various other heating methods are disclosed in the patent literature, for example, the electromagnetic heating method disclosed in the utility model patent publication nos. CN210211368U and CN206879132U, and the infrared heating method disclosed in the invention patent application publication No. CN109357101A, have not been practically used. The practice shows that the heating time of the electromagnetic heating mode or the infrared heating mode is far longer than that of the fire baking heating mode. Although the one-off processing of a plurality of pipe fittings can be realized through mechanical equipment, the overall efficiency is still far lower than that achieved by manual roasting heating.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the traditional steel-plastic conversion pipe is subjected to anti-corrosion processing under manual operation, so that the sleeve is easily burnt, the rejection rate is high, the bonding strength between the sleeve and the steel pipe is uneven, and the surface quality is poor; the processing cost is high, the single operation is realized, the efficiency is low, and the method is not suitable for large-scale industrial production; the traditional manual fire-baking operation is easy to cause safety accidents and burn, so that great potential safety hazards exist; the equipment solutions disclosed in the literature have a too low processing efficiency.
The invention provides anti-corrosion processing equipment for a steel-plastic conversion pipe aiming at solving the technical problem, which is used for processing the steel-plastic conversion pipe sleeved with a PE anti-corrosion sleeve to enable the PE anti-corrosion sleeve to shrink and be adhered to the steel-plastic conversion pipe and comprises a high-pressure air source for providing high-pressure air flow and an electromagnetic heating device for heating the high-pressure air flow and heating a pipe fitting by utilizing the heated high-pressure air flow, wherein the electromagnetic heating device is provided with an air heating channel and a pipe fitting heating channel, the pipe fitting heating channel is linearly communicated, high-pressure hot air flow jet orifices distributed along the circumferential direction are arranged on the inner wall of the pipe fitting heating channel, and the jet orifices are communicated with the air heating channel; the air heating channel is connected with a high-pressure air source. The electromagnetic heating device mainly comprises an electromagnetic coil and a metal heating part arranged in the magnetic field range of the electromagnetic coil, wherein the metal heating part is at least partially made of a magnetic conductive material, and the air heating channel is arranged inside the metal heating part.
The metal heating part generates heat under the action of the magnetic field of the electromagnetic coil, high-pressure airflow output by the high-pressure air source firstly enters an air heating channel inside the metal heating part, is heated into high-pressure hot airflow in the air heating channel, and then is sprayed onto the PE anti-corrosion sleeve positioned in the pipe fitting heating channel through a spray opening on the inner wall of the pipe fitting heating channel.
According to the scheme, the PE anti-corrosion sleeve is heated in a mode of jetting high-pressure hot air flow to the surface, the air flow is in direct contact with the surface of the sleeve for heat exchange, the heat conduction speed of the air flow in contact with the flame for heat exchange with the surface of the sleeve is equivalent to that of the flame for heat exchange, and compared with the existing electromagnetic heating and infrared heating modes, the heating time can be greatly shortened; the high-pressure airflow forms surface pressure on the surface of the sleeve, so that on one hand, the bonding strength between the anti-corrosion sleeve and the steel pipe can be effectively improved, and the pipe fitting has higher peel strength. On the other hand, the anti-corrosion sleeve is more smoothly attached to the surface of the steel pipe, and the bonding strength uniformity is good.
Preferably, the electromagnetic heating device is of a cylindrical structure and comprises an outer-layer electromagnetic coil, a middle-layer heat insulation layer and an inner-layer metal heating cylinder barrel, an inner cavity of the metal heating cylinder barrel is a through pipe heating channel, the air heating channel is arranged in the cylinder wall of the metal heating cylinder barrel, and the jet orifice is arranged on the inner wall of the metal heating cylinder barrel. After the electromagnetic coil is electrified, eddy current is generated in the magnetic conductive material of the metal part, and the generated heat heats the air in the air heating channel. The electromagnetic heating device with the sleeve structure greatly increases the heating area, so that hot air can heat tubular workpieces more uniformly and efficiently.
Preferably, the air heating channel comprises a circumferential main channel and a plurality of axial branch channels, the main channel surrounds the metal heating cylinder barrel for a circle, the branch channels are divided into two groups with equal number and are respectively communicated with the main channel from two sides of the main channel, and the branch channels in each group are uniformly distributed along the circumferential direction of the metal heating cylinder barrel.
Preferably, the metal heating cylinder barrel comprises an inner-layer cylinder barrel and an outer-layer cylinder barrel, the air heating channel is arranged between the inner-layer cylinder barrel and the outer-layer cylinder barrel, an air inlet connected with a high-pressure air source is arranged on the outer-layer cylinder barrel, and the jet orifice is arranged on the inner-layer cylinder barrel. The design of the two-layer structure is beneficial to the processing of the air heating channel.
According to the principle of the invention, the material of the metal heating cylinder barrel should preferably be ferrous material with better magnetic conductivity, and the actual process is usually made of the cast iron material, but the iron material is found to generate a large amount of rust in practice, so that the hot gas outlet is blocked. In order to avoid blockage, the material of the metal heating cylinder barrel is changed into an oxidation resistant material, a copper material is often adopted in general operation, but the copper material cannot generate the effect of magnetic heating.
Preferably, the metal heating cylinder barrel comprises an outer iron cylinder barrel and an inner copper cylinder barrel. The outer iron cylinder barrel is close to the electromagnetic coil, eddy current heating is formed under the action of an alternating magnetic field of the electromagnetic coil, and the heat conversion rate is particularly high. Compared with other materials such as iron materials and the like, the inner-layer copper cylinder barrel can reduce the generation and falling of oxide substances, thereby preventing the hot air outlet from being blocked due to falling oxide. Meanwhile, as an option, the material of the inner copper cylinder barrel can also be a material with good oxidation resistance, such as stainless steel, but the copper material is often adopted in consideration of simplicity of processing technology, universality of materials and cost control.
Further, the air heating channel is formed by combining a groove formed in the outer side wall of the copper cylinder barrel and the inner side wall of the iron cylinder barrel, and the structure can ensure that the thickness of the cylinder wall of the iron cylinder barrel is uniform. The iron cylinder that thickness is even compares in setting up the groove on the iron cylinder inside wall, more is favorable to reducing the influence to the vortex effect, improves energy conversion, also plays the more even effect of distribution to the heating of air simultaneously.
Preferably, the high-pressure air source is a high-pressure fan (the air pressure is greater than 30 Kpa), and an air outlet of the high-pressure fan is communicated with an air heating channel in the heating device through an air pipe.
Preferably, the injection ports are uniformly distributed on the inner wall of the pipe heating channel along the circumferential direction and the axial direction respectively, and the opening direction of the injection ports faces to a virtual cylindrical surface which is coaxial with the pipe heating channel and has a diameter smaller than that of the pipe heating channel. Preferably, the opening direction of the injection port is directed toward the axial center of the pipe heating passage. On one hand, high-pressure hot air can be directly sprayed onto the surface of the sleeve, and on the other hand, the pressure of the air flow is enabled to point to the axis, so that the maximum surface pressure is formed on the sleeve.
Preferably, the electromagnetic heating device is provided with a plurality of sets, and a plurality of steel-plastic conversion pipes can be subjected to anti-corrosion processing at the same time. The air pipe used for communicating the air heating channel and the air pressure source is composed of a main air pipe and a plurality of branch air pipes, one end of the main air pipe is connected with the air outlet of the high-pressure fan, the other end of the main air pipe is connected with each branch air pipe, and each branch air pipe is communicated with the air heating channel of one set of electromagnetic heating device.
As an improvement, each branch air pipe is provided with a control valve, and the ventilation of a certain branch air pipe can be controlled independently. The quantity of the processed workpieces can be controlled, and energy waste can be avoided.
As an improvement, the external power supply of each set of electromagnetic heating device is respectively provided with a control switch, and the power-on and power-off conditions of a certain electromagnetic heating device can be independently controlled. The quantity of the processed workpieces can be controlled, and the waste of electric energy can be avoided.
Preferably, the anti-corrosion processing equipment further comprises a fixed rack, a movable rack and a movable rack driving mechanism, wherein the movable rack is mounted on the equipment base through a sliding rail mechanism, and the movable rack driving mechanism comprises a screw rod mounted on the base through a bearing, a screw sleeve matched with the screw rod and fixedly arranged on the movable rack, and a motor driving the screw rod to rotate. The movable rack is internally provided with a plurality of sets of electromagnetic heating devices, the fixed rack is fixed at one end of the equipment base, and the fixed rack is provided with a plurality of pipe supporting rods which are in one-to-one correspondence with the heating devices.
During equipment uses, install the anticorrosive sheathed tube of PE steel-plastic conversion pipe on the pipe fitting bracing piece of suit, electromagnetic heating device carries out the heating from one end to the other end along with the anticorrosive sheathed tube of removal PE of removing the frame, and this kind of heating methods is favorable to the anticorrosive sheathed tube of PE and steel-plastic conversion pipe between the discharge of residual air, reduces the production of workpiece surface air pocket.
As an improvement, the pipe supporting rod consists of a large-diameter rod section and a small-diameter rod section. The large-diameter rod section is connected with the fixed frame, and the small-diameter rod section is connected to the tail end of the large-diameter rod section; the diameter of the large-diameter rod section is larger than the outer diameter of the PE anti-corrosion sleeve, and the diameter of the small-diameter station rod section is smaller than the inner diameter of the steel-plastic conversion pipe. The sleeving position of the steel-plastic conversion pipe sleeved with the PE anti-corrosion sleeve on the pipe supporting rod is limited by the step between the small-diameter rod section and the large-diameter rod section, so that the operation requirement and the workload of operators are reduced, and the processing efficiency is improved.
As an improvement, the two ends of the pipe heating channel are provided with cover plates, and the hole diameters of the cover plates are smaller than the diameter of the pipe heating channel and larger than the outer diameter of a processing workpiece sleeved with a PE anti-corrosion sleeve. The cover plate is beneficial to reducing the leakage of hot air, improving the heat utilization rate and reducing the ambient temperature.
As the improvement, the four sides and the top surface of the movable rack are provided with the protective screen plates, so that when workers are prevented from touching the heating device to scald, the heat dissipation of the outer-layer electromagnetic coil of the electromagnetic heating device is facilitated, and the electromagnetic coil is prevented from being burnt due to overheating.
The invention provides steel pipe anticorrosion processing equipment aiming at the problems to be solved by the invention and how to further improve the bonding effect between an anticorrosion sleeve and a steel pipe, the steel pipe anticorrosion processing equipment is used for processing the steel pipe sleeved with the PE anticorrosion sleeve to enable the PE anticorrosion sleeve to shrink and be adhered to the steel pipe, and comprises a high-pressure air source and an electromagnetic heating device, the electromagnetic heating device is provided with an air heating channel and a pipe heating channel, the pipe heating channel is linearly communicated, the inner wall of the pipe heating channel is provided with high-pressure hot air jet orifices distributed along the circumferential direction, and the jet orifices are communicated with the air heating channel; the air heating channel is connected with a high-pressure air source; the electromagnetic heating device comprises an electromagnetic coil and a metal heating part arranged in the magnetic field range of the electromagnetic coil, the metal heating part is at least partially made of a magnetic conductive material, and the air heating channel is arranged inside the metal heating part; the magnetic field range of the electromagnetic coil covers the pipe fitting heating channel, and the steel pipe passing through the pipe fitting heating channel generates heat under the action of the magnetic field of the electromagnetic coil.
The equipment is designed based on the inventive concept of synchronously heating the PE anticorrosive sleeve and preheating the steel pipe, a heating cylinder barrel capable of heating under the action of an electromagnetic coil is arranged around a processed pipe, and the electromagnetic coil of a pipe heating channel of the inner cavity of the heating cylinder barrel can be covered in the magnetic field range is arranged on the outer side of the heating cylinder barrel. The heating cylinder barrel forms high-pressure hot air flow by virtue of high-pressure air flow output by a high-pressure air source through an air heating channel structure arranged in the cylinder wall of the heating cylinder barrel, and the high-pressure hot air flow is sprayed onto the surface of a PE anti-corrosion sleeve sleeved on the pipe fitting through a high-pressure hot air flow spraying opening arranged on the inner wall of the cylinder barrel, so that the PE anti-corrosion sleeve is heated and pressurized simultaneously; the electromagnetic coil heats the heating cylinder barrel with closer radial distance in high power to reach the temperature required by high-pressure hot air flow of over 180 deg. on one hand, and heats the steel pipe in the inner cavity of the heating cylinder barrel with farther radial distance in low power to reach the preheating temperature required by adhesion of about 80 deg. on the other hand. The equipment is adopted to carry out the anti-corrosion processing of the steel pipe, so that the bonding effect between the anti-corrosion sleeve and the steel pipe can be obviously improved.
The technical scheme of the invention has the following beneficial effects: 1. the heating speed is high; 2. the surface quality of the processed pipe fitting is good; 3. the bonding effect between the anti-corrosion sleeve and the steel pipe is good: the bonding strength is uniform and high; 4. the processing cost of the anticorrosion processing of the steel-plastic conversion pipe can be greatly reduced; 5. the open fire operation is avoided, the improvement of the automation degree reduces the direct contact between workers and the processed pipe fittings, the potential safety hazard which can appear in the operation is reduced, and the production safety is greatly improved.
Drawings
Fig. 1 is a schematic view 1 of the overall structure of the anticorrosive processing equipment of the present invention.
Fig. 2 is a schematic view 2 of the overall structure of the anticorrosive processing equipment of the present invention.
FIG. 3 is an overall external view of the heating cylinder according to the present invention.
FIG. 4 is a schematic axial cross-sectional view of the heated cylinder of the present invention.
Fig. 5 is a schematic structural view of the copper cylinder of the present invention.
Fig. 6 is a magnetic field distribution diagram of the electromagnetic heating device according to the present invention.
Fig. 7 is a schematic diagram illustrating the relative position movement between the pipe support rod and the heating cylinder in the present invention.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings. It should be noted that the following examples are only used to more clearly illustrate the technical solutions of the present invention, and the protection scope of the present invention is not limited thereby.
Referring to fig. 1 and 2, the anti-corrosion processing apparatus of the present embodiment includes a base portion, a fixed frame portion, a movable frame driving portion, and an auxiliary portion.
The base part comprises a base 1 and a base 2, the base 1 is connected with the base 2, and two sides above the base 2 are provided with slide rails 3 in parallel; the fixed rack part comprises a fixed rack 4 and pipe support rods 5, the fixed rack 4 is arranged above the base 1, the pipe support rods 5 are arranged on the front surface of the fixed rack 4, the pipe support rods 5 are arranged in 2 rows, and 4 pipe support rods are arranged in a rectangular shape; the moving rack part comprises a moving rack 6, a heating cylinder barrel 7 and a protective screen plate 8, the moving rack 6 is placed on the slideway 3, the protective screen plate 8 is arranged on the four sides and the top surface of the moving rack 6, the heating cylinder barrel 7 is in a sleeve shape and is arranged on the moving rack 6, the heating cylinder barrel 7 is provided with an upper row and a lower row, 4 heating cylinders are arranged in each row, and the heating cylinder barrels are arranged in a rectangle; the driving part of the movable rack comprises a servo motor 9 and a screw rod device 10, the screw rod device 10 comprises a screw rod which is arranged on a base through a bearing, a screw sleeve which is fixedly arranged on the movable rack is matched with the screw rod along the longitudinal central line direction of the rack 2, and the servo motor 9 drives the screw rod to rotate; the auxiliary part comprises a servo high-pressure fan 11, an air pipe branch air pipe 12, a main air pipe 13 and crawler-type wire boxes 14, wherein the servo high-pressure fan 11 is installed on one side of the fixed rack 4, the branch air pipe 12 is installed on one side of the movable rack 6 and on the same side as the servo high-pressure fan 11, the servo high-pressure fan 11 is connected with the branch air pipe 12 through the main air pipe 13, the branch air pipes 12 are totally 8 and are respectively connected with 8 heating cylinder barrels 7, and the crawler-type wire boxes 14 are on the same side as the branch air pipe 12 and are connected with the heating cylinder.
The pipe support rods 5 correspond to the heating cylinder barrels 7 one by one, and the circle centers of the cross sections of each group of pipe support rods 5 and the cross sections of the corresponding heating cylinder barrels 7 are located on the same horizontal axis.
The pipe supporting rod 5 is divided into two parts, and consists of a large-diameter rod section and a small-diameter rod section. The large-diameter rod section is connected with the fixed frame 4, and the small-diameter rod section is connected to the tail end of the large-diameter rod section; the diameter of the large-diameter rod section is larger than the outer diameter of the thermal shrinkage protective pipe, and the diameter of the small-diameter station rod section is smaller than the inner diameter of the steel-plastic conversion pipe. The sleeving position of the steel-plastic conversion pipe sleeved with the PE anti-corrosion sleeve on the pipe support rod 5 is limited by the step between the small-diameter rod section and the large-diameter rod section.
Referring to fig. 3, 4 and 5, the inner heating cylinder of the heating cylinder 7 is formed by tightly attaching an iron cylinder 17 and a copper cylinder 18, the iron cylinder 17 is located outside the copper cylinder 18, and the inner cavity of the copper cylinder 18 forms the inner cavity of the heater tubular structure. The air heating channel is formed by combining a groove formed in the outer side wall of the copper cylinder 18 and the inner side wall of the iron cylinder 17, and the thickness of the cylinder wall of the iron cylinder 17 is uniform. The air heating channel comprises a circumferential main channel and a plurality of axial branch channels, the main channel winds the heating cylinder barrel for 7 circles, the branch channels are divided into two groups with equal number and are respectively communicated with the main channel from two sides of the main channel, and the branch channels in each group are uniformly distributed along the circumferential direction of the heating cylinder barrel 7. The inner wall of the pipe fitting heating channel is respectively and uniformly distributed with jet orifices along the circumferential direction and the axial direction, the opening direction of the jet orifices faces to a virtual cylindrical surface which is coaxial with the pipe fitting heating channel and the diameter of which is smaller than that of the pipe fitting heating channel, and the opening direction of the jet orifices faces to the axis of the pipe fitting heating channel. The jet orifice penetrates through the copper cylinder barrel and is communicated with the air heating channel and the pipe fitting heating channel. The outside of the iron cylinder 18 is provided with a middle layer heat insulation layer 16, and the outside of the middle layer heat insulation layer 16 is provided with an outer layer electromagnetic coil 15. The branch air pipe 12 passes through the outer electromagnetic coil 15, the middle heat-insulating layer 16 and the iron cylinder 17 in sequence and is communicated with the air heating channel. And cover plates 19 are arranged at two ends of the heating cylinder barrel 7 to reduce the overflow of hot air. The wires in the tracked wire box 14 are connected to the coil layer 15 to supply power thereto.
The working principle is as follows:
a worker fixedly sleeves a steel-plastic conversion pipe workpiece sleeved with a PE (polyethylene) anticorrosive sleeve on the pipe support rod 5, sleeves a heat insulation sleeve on a plastic section of the steel-plastic conversion pipe, opens the servo high-pressure fan 11, and air with pressure generated by the servo high-pressure fan 11 respectively enters air heating channels in the heating cylinder barrels 7 through the main air pipe 13 and the branch air pipes 12; an electromagnetic heating switch is turned on, an electromagnetic heating structure consisting of an outer-layer electromagnetic coil 15 and an iron cylinder 17 generates heat, eddy current is formed in the iron cylinder 17, electromagnetic energy is converted into heat energy, and air in an air heating channel is heated; the heated hot air with pressure is sprayed into the pipe fitting heating channel in the heating cylinder barrel 7 through the spray opening, and the cover plates 19 at the two ends can reduce the overflow of the hot air; the servo motor 9 is started, the screw rod 10 rotates to drive the movable rack 6 to move and move towards the fixed rack 4, the steel-plastic conversion pipe workpiece sleeved with the PE anti-corrosion sleeve on the pipe supporting rod 5 penetrates through a pipe heating channel inside the heating cylinder 7 and is heated by hot air therein, and meanwhile, a steel pipe in the pipe heating channel generates heat because the steel pipe is positioned in a magnetic field covered by the outer electromagnetic coil 15, and the steel pipe generates heat. The glue layer of the inner layer of the PE anti-corrosion sleeve is heated and then melted, and the PE anti-corrosion sleeve shrinks and is tightly and uniformly attached to the steel-plastic conversion pipe under the condition that certain pressure is applied to high-pressure hot air in the channel of the heating cylinder 7.
Referring to fig. 6, the magnetic field generated by the heating coil layer 15 after being energized covers not only the iron cylinder 17 but also the pipe heating channel of the heating cylinder 7, the steel pipe 101 generates heat in the magnetic field, self-heats, because the steel pipe is located at a position farther radially from the heating coil, where the magnetic field strength is weaker than that of the heating cylinder 7, and the steel pipe wall is thinner, therefore, the temperature of the steel pipe heated by the electromagnetic coil is lower than the temperature of the heating cylinder barrel 7, and the temperature can be set just by the magnetic field distribution design of the coil, the radial distance design and the pipe fitting passing speed, so that when the heating cylinder 7 is heated to the temperature required for the PE anti-corrosion sleeve 102 to shrink by more than 180 degrees, the steel pipe passing through the pipe fitting heating channel can be heated to the preheating temperature required by hot melt adhesive bonding at about 80 ℃, so that the steel pipe 101 and the PE anti-corrosion sleeve 102 are bonded better.
Referring to fig. 7, the heating cylinder 7 is moved from the position a shown in fig. 7 to the position B shown in fig. 7 so that all parts of the workpiece can completely enter from one end of the heating cylinder 7 and exit from the other end, thereby being heated for the same time; heating the PE anti-corrosion sleeve from one end and moving the PE anti-corrosion sleeve to the other end, so that residual air between the PE anti-corrosion sleeve and the steel-plastic conversion pipe is extruded out; then, the servo motor 9 rotates reversely, and the screw rod 10 drives the movable rack 6 to move reversely and is far away from the fixed rack 4. The moving frame 6 moves back and forth repeatedly within a set time, and drives the heating cylinder 7 to heat the pipe fitting. After the heating is finished, the PE anti-corrosion sleeve is coated on the steel-plastic conversion pipe, the anti-corrosion processing of the steel-plastic conversion pipe is finished, and the steel-plastic conversion pipe is taken down by a worker.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various modifications and decorations without departing from the principle of the present invention, and these should be construed as the protection scope of the present invention.
Claims (10)
1. An anti-corrosion processing device for a steel-plastic conversion pipe is used for processing the steel-plastic conversion pipe sleeved with a PE anti-corrosion sleeve to enable the PE anti-corrosion sleeve to shrink and be adhered to the steel-plastic conversion pipe, and is characterized by comprising a high-pressure air source used for providing high-pressure air flow and an electromagnetic heating device used for heating the high-pressure air flow and heating a pipe fitting by utilizing the heated high-pressure air flow, wherein the electromagnetic heating device is provided with an air heating channel and a pipe fitting heating channel, the pipe fitting heating channel is linearly communicated, high-pressure hot air flow jet orifices distributed along the circumferential direction are arranged on the inner wall of the pipe fitting heating channel, and the jet orifices are communicated with the air; the air heating channel is connected with a high-pressure air source; the electromagnetic heating device mainly comprises an electromagnetic coil and a metal heating part arranged in the magnetic field range of the electromagnetic coil, wherein the metal heating part is at least partially made of a magnetic conductive material, and the air heating channel is arranged inside the metal heating part;
the metal heating part generates heat under the action of the magnetic field of the electromagnetic coil, high-pressure airflow output by the high-pressure air source firstly enters an air heating channel inside the metal heating part, is heated into high-pressure hot airflow in the air heating channel, and then is sprayed onto the PE anti-corrosion sleeve positioned in the pipe fitting heating channel through a spray opening on the inner wall of the pipe fitting heating channel.
2. The steel-plastic conversion pipe anticorrosion processing equipment as claimed in claim 1, wherein the electromagnetic heating device is of a cylindrical structure and is composed of an outer electromagnetic coil, a middle heat insulation layer and an inner metal heating cylinder barrel, an inner cavity of the metal heating cylinder barrel is a through pipe heating channel, the air heating channel is arranged in the cylinder wall of the metal heating cylinder barrel, and the jet orifice is arranged on the inner wall of the metal heating cylinder barrel.
3. The steel-plastic conversion pipe anti-corrosion processing equipment according to claim 2, wherein the air heating channel comprises a circumferential main channel and a plurality of axial branch channels, the main channel winds the metal heating cylinder barrel for one circle, the branch channels are divided into two groups with equal number and are respectively communicated with the main channel from two sides of the main channel, and the branch channels in each group are uniformly distributed along the circumferential direction of the metal heating cylinder barrel.
4. The steel-plastic conversion pipe anticorrosion processing equipment as recited in claim 2, wherein the metal heating cylinder comprises two layers of structures, namely an inner layer cylinder and an outer layer cylinder, the air heating channel is arranged between the inner layer cylinder and the outer layer cylinder, the air inlet connected with a high-pressure air source is arranged on the outer layer cylinder, and the jet orifice is arranged on the inner layer cylinder.
5. The steel-plastic conversion pipe anti-corrosion processing equipment according to claim 1, wherein the injection ports are uniformly distributed on the inner wall of the pipe heating channel along the circumferential direction and the axial direction, respectively, and the opening direction of the injection ports faces to the axis of the pipe heating channel.
6. The steel-plastic conversion pipe anti-corrosion processing equipment according to claim 1, wherein the high-pressure air source is a high-pressure fan, and an air outlet of the high-pressure fan is communicated with an air heating channel in the heating device through an air pipe.
7. The steel-plastic conversion pipe anticorrosion processing equipment as recited in claim 1, wherein the electromagnetic heating device is a plurality of sets, the air pipes for communicating the air heating channel and the air pressure source are composed of a main pipe and a plurality of branch air pipes, one end of the main pipe is connected with the air outlet of the high pressure blower, the other end of the main pipe is respectively connected with each branch air pipe, and each branch air pipe is respectively communicated with the air heating channel of one set of electromagnetic heating device.
8. The steel-plastic conversion pipe anticorrosion processing equipment as recited in claim 7, wherein the equipment further comprises a fixed frame, a movable frame, and a movable frame driving mechanism, the movable frame is mounted on the equipment base through a slide rail mechanism, the movable frame driving mechanism comprises a screw rod mounted on the base through a bearing, a screw sleeve fixedly arranged on the movable frame and matched with the screw rod, and a motor driving the screw rod to rotate; the movable rack is internally provided with a plurality of sets of electromagnetic heating devices, the fixed rack is fixed at one end of the equipment base, and the fixed rack is provided with a plurality of pipe supporting rods which are in one-to-one correspondence with the heating devices.
9. The steel-plastic conversion pipe anticorrosion processing equipment according to claim 8, wherein the four sides and the top surface of the movable rack are provided with protective mesh plates, so that workers are prevented from touching the heating device to scald, heat dissipation of an outer-layer electromagnetic coil of the electromagnetic heating device is facilitated, and the electromagnetic coil is prevented from being burnt due to overheating.
10. A steel pipe anticorrosion processing device is used for processing a steel pipe sleeved with a PE anticorrosion sleeve to enable the PE anticorrosion sleeve to shrink and be adhered to the steel pipe, and is characterized by comprising a high-pressure air source and an electromagnetic heating device, wherein the electromagnetic heating device is provided with an air heating channel and a pipe heating channel, the pipe heating channel is linearly communicated, high-pressure hot air jet orifices distributed along the circumferential direction are arranged on the inner wall of the pipe heating channel, and the jet orifices are communicated with the air heating channel; the air heating channel is connected with a high-pressure air source;
the electromagnetic heating device comprises an electromagnetic coil and a metal heating part arranged in the magnetic field range of the electromagnetic coil, the metal heating part is at least partially made of a magnetic conductive material, and the air heating channel is arranged inside the metal heating part; the magnetic field range of the electromagnetic coil covers the pipe fitting heating channel, and the steel pipe passing through the pipe fitting heating channel generates heat under the action of the magnetic field of the electromagnetic coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010846812.3A CN111844768A (en) | 2020-08-21 | 2020-08-21 | Anticorrosive processing equipment of steel-plastic conversion pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010846812.3A CN111844768A (en) | 2020-08-21 | 2020-08-21 | Anticorrosive processing equipment of steel-plastic conversion pipe |
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| Publication Number | Publication Date |
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| CN111844768A true CN111844768A (en) | 2020-10-30 |
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| CN202010846812.3A Pending CN111844768A (en) | 2020-08-21 | 2020-08-21 | Anticorrosive processing equipment of steel-plastic conversion pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113787726A (en) * | 2021-11-18 | 2021-12-14 | 沈阳新智源医疗用品有限公司 | Conduit heat-sealing machine |
| CN113799377A (en) * | 2021-11-18 | 2021-12-17 | 沈阳新智源医疗用品有限公司 | Automatic tensile laminating equipment of pipe |
-
2020
- 2020-08-21 CN CN202010846812.3A patent/CN111844768A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113787726A (en) * | 2021-11-18 | 2021-12-14 | 沈阳新智源医疗用品有限公司 | Conduit heat-sealing machine |
| CN113799377A (en) * | 2021-11-18 | 2021-12-17 | 沈阳新智源医疗用品有限公司 | Automatic tensile laminating equipment of pipe |
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