CN212764841U

CN212764841U - Anticorrosive processing equipment of steel-plastic conversion pipe

Info

Publication number: CN212764841U
Application number: CN202021757951.0U
Authority: CN
Inventors: 孙志强; 童津金; 孙杰
Original assignee: Ningbo Hengyuan Precision Valves Technology Co ltd
Current assignee: Ningbo Hengyuan Precision Valves Technology Co ltd
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2021-03-23
Anticipated expiration: 2030-08-21

Abstract

The utility model belongs to the technical field of corrosion prevention of gas pipelines, and discloses an anticorrosive processing device of 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 utility model discloses reach following effect: 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, avoid open fire operation, improve the security of production greatly.

Description

Anticorrosive processing equipment of steel-plastic conversion pipe

Technical Field

The utility model belongs to the technical field of the anticorrosion of gas pipeline, a anticorrosive processing technique of steel-plastic switching tube is related to, especially relate to the anticorrosive processing equipment who is applicable to the anticorrosive technique of pyrocondensation processing formula 3 PE.

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. the air bag is 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 utility model 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 utility model discloses the technical problem who solves: 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 utility model discloses the technical scheme who adopts: an anticorrosion processing device of a steel-plastic conversion pipe is used for processing the steel-plastic conversion pipe sleeved with a PE anticorrosion sleeve, so that the PE anticorrosion sleeve is contracted and adhered to the steel-plastic conversion pipe, and comprises a high-pressure air source for providing high-pressure air flow and a heating device for heating the high-pressure air flow and heating a pipe fitting by utilizing the heated high-pressure air flow, wherein the heating device is provided with an air heating channel, a pipe fitting heating channel and a heating part for heating air in the air heating channel; the pipe fitting heating channel penetrates through the heating device in a straight line, 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 high-pressure air flow output by the high-pressure air source firstly enters an air heating channel in the heating device, is heated into high-pressure hot air flow in the air heating channel, and then is sprayed to the PE anti-corrosion sleeve 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 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 fitting 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 fitting heating channel and has a diameter smaller than that of the pipe fitting 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 heating devices are multiple 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 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 heating device is respectively provided with a control switch, and the power-on and power-off conditions of a certain heating device can be independently controlled. The quantity of the processed workpieces can be controlled, and the waste of electric energy can be avoided.

As preferred, the utility model discloses anticorrosive processing equipment still includes fixed frame, removes the frame, removes frame actuating mechanism, removes the frame and passes through slide rail mechanism and install on the equipment base, removes frame actuating mechanism and includes the lead screw of installing on the base through the bearing, with the fixed screw cover, the rotatory motor of drive lead screw that sets up on removing the frame of lead screw complex. The heating device is arranged in the movable rack in multiple sets, 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 correspond to the heating device one by one.

During equipment uses, install the conversion pipe on the pipe fitting bracing piece with the anticorrosive sheathed tube steel of PE, heating device carries out the heating from one end to the other end along with the anticorrosive sleeve pipe of removal PE of removing the frame, and this kind of heating methods is favorable to the anticorrosive sleeve pipe of PE and steel to mould the discharge of residual air between the conversion pipe, 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.

Preferably, 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 workpiece to be machined sleeved with the 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.

Preferably, the heating device is of a cylindrical structure, the heating component is a heating cylinder, an inner cavity of the heating cylinder is the pipe heating channel, the air heating channel is arranged in the cylinder wall of the heating cylinder, and the jet orifice is arranged on the inner wall of the heating cylinder. Preferably, the air heating channel comprises a circumferential main channel and a plurality of axial branch channels, the main channel surrounds the 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 heating cylinder barrel.

Furthermore, the 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.

Alternatively, the heating device is an electric heating device and consists of an inner heating cylinder and an outer heat-insulating layer, the air heating channel is arranged in the heating cylinder, and an electric heating wire or a PTC heating element is arranged in the air heating channel. Compared with the common electric heating wire, the PTC element has the characteristics of automatic power regulation, self-limiting temperature and the like.

Furthermore, the air heating channel is composed of an air inlet cavity and a plurality of air outlet channels, the air outlet channels are respectively communicated with the air inlet cavity, the air inlet cavity is communicated with the air inlet, the air inlet is connected with a high-pressure air source, the jet ports are communicated with the air outlet channels in groups, and the heating wires or PTC heating elements are distributed in the air outlet channels.

Alternatively, the heating device is an electromagnetic heating device and comprises an electromagnetic coil and a metal part which is arranged in the magnetic field range of the electromagnetic coil and used as the heating part, the metal part is at least partially made of a magnetic conductive material, and the air heating channel is positioned inside the metal part.

Furthermore, the electromagnetic heating device is composed of an outer layer electromagnetic coil and an inner layer metal heating cylinder barrel, an inner cavity of the metal heating cylinder barrel is a pipe heating channel which is communicated from front to back, the air heating channel is arranged inside 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.

Furthermore, the metal heating cylinder barrel is formed by tightly attaching an iron cylinder barrel and a copper cylinder barrel, the iron cylinder barrel is arranged on the outer side of the copper cylinder barrel, and the inner cavity of the copper cylinder barrel forms the inner cavity of the heater tubular structure. The ferrous material is in the magnetic field generated by the electromagnetic coil due to the characteristics of the ferrous material, forms an eddy current, and has particularly high heat conversion rate. The copper material is more anticorrosive as sleeve inner wall because its characteristic, can reduce the oxide and generate and drop and avoid the jam of jet, and equipment loss is lower, and the sleeve inner wall needs to have the trompil simultaneously, and copper material processing is more convenient.

Further, the air heating channel is formed by the combination of 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 thickness of the cylinder wall of the iron cylinder barrel is uniform. The iron cylinder that thickness is even compares and sets up the groove in setting up on the iron cylinder inside wall, more is favorable to reducing the influence to the vortex effect, improves energy conversion, and is also distributed more evenly to the heating of air simultaneously.

Preferably, the electromagnetic heating device is provided with an intermediate heat insulation layer between the electromagnetic coil and the metal heating cylinder barrel. The heat dissipation of the metal heating cylinder barrel is reduced, the heat dissipation of the electromagnetic coil is not influenced, the heat utilization rate is improved, and the loss of the coil is reduced.

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 electromagnetic 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 utility model discloses technical scheme has following beneficial effect: 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 anti-corrosion processing equipment of the present invention.

Fig. 2 is the overall structure schematic diagram 2 of the anti-corrosion processing equipment of the present invention.

Fig. 3 is an overall appearance view of the heating cylinder of the present invention.

Fig. 4 is a schematic axial sectional view of the heating cylinder according to the present invention.

Fig. 5 is a schematic structural view of the copper cylinder of the heating cylinder of the present invention.

Fig. 6 is a schematic diagram of 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 illustrate the technical solutions of the present invention more clearly, 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 matched with the screw rod and fixedly arranged on the movable rack is arranged along the direction of the longitudinal central line 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 crawler-type wire box 14 are connected with the outer electromagnetic coil 15 to supply power to the crawler-type wire box.

The working principle is as follows:

the worker fixedly sleeves the steel-plastic composite pipe workpiece sleeved with the thermal shrinkage protective pipe on the pipe support rod 5, sleeves a heat insulation sleeve on the plastic section of the steel-plastic composite pipe, opens the servo high-pressure fan 11, and air with pressure generated by the servo high-pressure fan 11 respectively enters the 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 in 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 heating cylinder 7 is moved from the position a shown in fig. 6 to the position B shown in fig. 6 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, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these should be considered as the protection scope of the present invention.

Claims

1. An anticorrosion processing device of a steel-plastic conversion pipe is used for processing the steel-plastic conversion pipe sleeved with a PE anticorrosion sleeve, so that the PE anticorrosion sleeve is contracted and adhered to the steel-plastic conversion pipe, and is characterized by comprising a high-pressure air source for providing high-pressure air flow and a heating device for heating the high-pressure air flow and heating a pipe fitting by utilizing the heated high-pressure air flow, wherein the heating device is provided with an air heating channel, a pipe fitting heating channel and a heating part for heating air in the air heating channel; the pipe fitting heating channel penetrates through the heating device in a straight line, 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 high-pressure air flow output by the high-pressure air source firstly enters an air heating channel in the heating device, is heated into high-pressure hot air flow in the air heating channel, and then is sprayed to the PE anti-corrosion sleeve 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 according to claim 1, wherein the high-pressure air source is a high-pressure blower, and an air outlet of the high-pressure blower is communicated with an air heating channel in the heating device through an air pipe.

3. The apparatus for corrosion-proofing a steel-plastic conversion pipe according to claim 1, wherein said injection ports are uniformly distributed on the inner wall of the pipe heating passage in the circumferential direction and the axial direction, respectively, and the opening direction of the injection ports is toward the axial center of the pipe heating passage.

4. The steel-plastic conversion pipe anticorrosion processing equipment as recited in claim 1, wherein the heating device is integrally of a cylindrical structure, the heating component is a heating cylinder, the inner cavity of the heating cylinder is the pipe heating channel, the air heating channel is arranged in the wall of the heating cylinder, and the jet orifice is arranged on the inner wall of the heating cylinder.

5. The steel-plastic conversion pipe anticorrosion processing equipment as recited in claim 4, wherein the heating cylinder comprises two layers of structure of 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 the high-pressure air source is arranged on the outer layer cylinder, and the jet orifice is arranged on the inner layer cylinder.

6. The steel-plastic conversion pipe anticorrosion processing equipment according to claim 1, wherein the heating device is an electric heating device and is composed of an inner heating cylinder and an outer insulating layer, the air heating channel is arranged inside the heating cylinder, and an electric heating wire or a PTC heating element is arranged in the air heating channel.

7. The steel-plastic conversion pipe anticorrosion processing equipment as recited in claim 2, wherein the 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 heating device.

8. The anticorrosive processing equipment for a steel-plastic switching pipe according to claim 7, wherein each branch air pipe is provided with a control valve, and the ventilation of one branch air pipe can be independently controlled; the external power supply of each set of heating device is respectively provided with a control switch, and the power-on and power-off conditions of a certain heating device can be independently controlled.

9. The steel-plastic conversion pipe anticorrosion processing equipment according to 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, and the movable frame 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 frame, and a motor driving the screw rod to rotate; the heating device is arranged in the movable rack in multiple sets, 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 correspond to the heating device one by one.

10. The anticorrosive processing equipment for a steel-plastic conversion pipe according to claim 9, wherein the pipe support rod is composed 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 pipe fitting heating channel both ends are provided with the apron, and the apron aperture is less than the diameter of pipe fitting heating channel, is greater than the cover and has the anticorrosive sheathed tube of PE's processing work piece external diameter.