CN214000602U

CN214000602U - Porous anticorrosion heat-shrinkable sleeve heating device

Info

Publication number: CN214000602U
Application number: CN202021757535.0U
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: 2021-08-20
Anticipated expiration: 2030-08-21

Abstract

The utility model belongs to the technical field of the anticorrosion of gas pipeline, a anticorrosive heat shrinkage sleeve heating device in porous position is disclosed, including the high pressure wind regime, a plurality of electromagnetic heating section of thick bamboo of radially arranging, electromagnetic heating section of thick bamboo is by outer solenoid, the middle level insulating layer, the metal heating cylinder is constituteed, the metal heating cylinder is made by magnetic material at least partially, the pipe fitting heating channel that the inner chamber is link up for the axial, be equipped with the high-pressure hot gas flow jet along circumference distribution on the inner wall, the section of thick bamboo is equipped with the air heating passageway in the wall, jet and air heating passageway intercommunication, the air heating passageway is equipped with the interface that admits air, the air outlet in high pressure wind regime communicates with the air heating passageway interface that admits air of each electromagnetic heating section of thick bamboo respectively. 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, avoided naked light operation, improved the security of production greatly.

Description

Porous anticorrosion heat-shrinkable sleeve heating device

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 potential safety hazards 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 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.

In order to solve the problems, the utility model provides a multi-hole anti-corrosion heat shrinkage sleeve heating device which can be suitable for anti-corrosion processing equipment of a steel-plastic conversion pipe, comprising a high-pressure air source for providing high-pressure air flow and a plurality of electromagnetic heating cylinders which are radially arranged, the electromagnetic heating cylinder consists of an outer electromagnetic coil, a middle heat-insulating layer and an inner metal heating cylinder barrel positioned in the magnetic field range of the electromagnetic coil, the metal heating cylinder barrel is at least partially made of magnetic conductive materials, the inner cavity of the metal heating cylinder barrel is a pipe fitting heating channel which is axially communicated, high-pressure hot air jet orifices which are distributed along the circumferential direction are arranged on the inner wall of the metal heating cylinder barrel, an air heating channel is arranged in the barrel wall of the metal heating cylinder barrel, the jet orifice is communicated with an air heating channel, the air heating channel is provided with an air inlet interface, and an air outlet of the high-pressure air source is respectively communicated with the air inlet interfaces of the air heating channels of the electromagnetic heating cylinders.

The metal heating cylinder barrel generates heat under the action of a magnetic field of the electromagnetic coil, high-pressure airflow output by the high-pressure air source firstly enters an air heating channel inside the barrel wall of the metal heating cylinder barrel, is heated into high-pressure hot airflow in the air heating channel, and then is sprayed to a heat-shrinkable sleeve positioned in the pipe fitting heating channel through a spray opening on the inner wall of the metal heating cylinder barrel.

The scheme adopts a mode of jetting high-pressure hot air flow to the surface to heat the heat-shrinkable sleeve, the air flow directly contacts the surface of the sleeve to exchange heat, the heat conduction speed of the air flow and the surface of the sleeve in contact with flame is equivalent to that of the heat exchange, and compared with the existing electromagnetic heating and infrared heating modes, the heating time can be greatly shortened; the high-pressure air flow forms surface pressure on the surface of the sleeve, which is helpful for the heat-shrinkable sleeve to uniformly shrink towards the axis. The tubular structure of the electromagnetic heating cylinder greatly increases the heating area, so that the hot air can heat the tubular workpiece more uniformly and efficiently. It is understood that the heating device of the utility model is not only suitable for the anti-corrosion processing of the steel-plastic conversion pipe, but also suitable for the anti-corrosion processing of other heat shrinkable sleeves.

As an improvement, the magnetic field range of the electromagnetic coil covers the pipe fitting heating channel, and a steel pipe passing through the pipe fitting heating channel can generate heat under the action of the electromagnetic coil.

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 cast iron material is often adopted in the actual process, but in practice, the injection port is often found to be blocked after being used for a short period of time, and the blockage is proved to be caused by that the iron at the injection port is oxidized to generate oxide and continuously grows and expands, and meanwhile, the ferrous material exposed in the air heating channel is oxidized to generate oxide which falls off and then gathers at the injection port along with the air flow, so that the injection port 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.

Aiming at the problems, the invention provides a special heating cylinder barrel, and 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 injection port 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 jetting ports are uniformly distributed on the inner wall of the metal heating cylinder along the circumferential direction and the axial direction respectively, and the opening direction of the jetting ports faces to a virtual cylindrical surface which is coaxial with the metal heating cylinder and has a diameter smaller than that of the metal heating cylinder. Preferably, the orifice opening direction is directed toward the axis of the metal heating cylinder. 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 air pipe for communicating the air heating channel and the high-pressure air 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 connected with the air inlet interface of the air heating channel of the electromagnetic heating cylinder.

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 electromagnetic heating cylinder is respectively provided with a control switch, and the power-on and power-off conditions of a certain electromagnetic heating cylinder can be independently controlled. The quantity of the processed workpieces can be controlled, and the waste of electric energy can be avoided.

As an improvement, cover plates are arranged at two ends of the pipe heating channel, and the hole diameter of each cover plate is smaller than that of the pipe heating channel and larger than that of a processing workpiece sleeved with an anti-corrosion heat-shrinkable 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 heating device are provided with the protective screen plates, so that when workers are prevented from touching the electromagnetic heating cylinder to scald, the heat dissipation of the outer-layer electromagnetic coil of the electromagnetic heating cylinder is facilitated, and the electromagnetic coil is prevented from being overheated and burnt.

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 is 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 using the heating device of the present invention.

Fig. 2 is a schematic view 2 of the overall structure of the anti-corrosion processing equipment using the heating device of the present invention.

Fig. 3 is an overall appearance diagram of the heating cylinder in the heating device of the present invention.

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

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

Fig. 6 is a schematic diagram of the relative position movement between the heating cylinder and the pipe support rod of the processing equipment in the heating device of 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 equipment using the heating device of the present invention 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 barrels 7 to supply power.

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 anti-corrosion heat-shrinkable sleeve on the pipe support rod 5 is limited by a 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:

a worker fixedly sleeves a steel-plastic conversion pipe workpiece sleeved with an anticorrosion heat-shrinkable 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 heater sleeve 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 to the direction of the fixed rack 4, the steel-plastic conversion pipe workpiece sleeved with the anti-corrosion heat-shrinkable pipe on the pipe supporting rod 5 penetrates through a pipe heating channel inside the heating cylinder 7 and is heated by hot air in the heating cylinder, and meanwhile, a steel pipe in the pipe heating channel generates heat due to the fact that the steel pipe is located in a magnetic field covered by the outer-layer electromagnetic coil 15, and the steel pipe is heated. The glue layer in the anticorrosion heat-shrinkable sleeve is heated and then melted, and the anticorrosion heat-shrinkable sleeve shrinks and is tightly and uniformly attached to the steel-plastic conversion pipe under the condition that a 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 anticorrosive heat-shrinkable sleeve from one end and moving the sleeve to the other end so as to extrude out residual air between the anticorrosive heat-shrinkable sleeve and the steel-plastic conversion pipe; 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 corrosion-resistant heat shrinkable sleeve is coated on the steel-plastic conversion pipe, the corrosion-resistant 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. A multi-hole-position anticorrosion heat-shrinkable sleeve heating device comprises a high-pressure air source for providing high-pressure air flow and a plurality of electromagnetic heating cylinders which are radially arranged, and is characterized in that each electromagnetic heating cylinder comprises an outer electromagnetic coil, a middle-layer heat-insulating layer and an inner metal heating cylinder barrel which is positioned in the magnetic field range of the electromagnetic coil, each metal heating cylinder barrel is at least partially made of a magnetic conductive material, an inner cavity of each metal heating cylinder barrel is a pipe fitting heating channel which is axially communicated, high-pressure hot air flow jet ports which are circumferentially distributed are arranged on the inner wall of each metal heating cylinder barrel, an air heating channel is arranged in the barrel wall of each metal heating cylinder barrel and communicated with the air heating channel, the air heating channel is provided with an air inlet, and an air outlet of the high-pressure air source is respectively communicated.

2. The porous anticorrosion heat-shrinkable sleeve heating device of claim 1, wherein the injection ports are uniformly distributed on the inner wall of the metal heating cylinder along the circumferential direction and the axial direction; the opening direction of the jet orifice faces to the axis of the metal heating cylinder.

3. The porous anticorrosion heat-shrinkable sleeve heating device of claim 1, wherein the air heating channel comprises a circumferential main channel and a plurality of axial branch channels, the main channel surrounds the metal heating cylinder for one turn, 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.

4. The porous anticorrosion heat-shrinkable sleeve heating device of claim 1, wherein the metal heating cylinder comprises an inner cylinder and an outer cylinder, the air heating channel is arranged between the inner cylinder and the outer cylinder, the air inlet connected with a high-pressure air source is arranged on the outer cylinder, and the jet orifice is arranged on the inner cylinder.

5. The porous anticorrosion heat-shrinkable sleeve heating device of claim 1, wherein the metal heating cylinder comprises an outer iron cylinder and an inner copper cylinder, the air heating channel is arranged between the copper cylinder and the iron cylinder, an air inlet connected with a high-pressure air source is arranged on the iron cylinder, and the jet orifice is arranged on the copper cylinder; 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.

6. The porous anticorrosion heat-shrinkable sleeve heating device according to claim 1, wherein the air pipes for communicating the air heating channel and the high-pressure air source are composed of a main air pipe and a plurality of branch air pipes, one end of the main air pipe is connected to the air outlet of the high-pressure air source, the other end of the main air pipe is connected to each branch air pipe, and each branch air pipe is connected to the air inlet port of the air heating channel of one electromagnetic heating cartridge.

7. The porous anticorrosion heat-shrinkable sleeve heating device of claim 1, wherein the magnetic field range of the electromagnetic coil covers the pipe heating channel, and the steel pipe passing through the pipe heating channel generates heat under the action of the electromagnetic coil.

8. The porous anticorrosion heat-shrinkable sleeve heating device of claim 1, wherein cover plates are arranged at two ends of the pipe heating channel, and the hole diameter of each cover plate is smaller than that of the pipe heating channel and larger than that of a processing workpiece sleeved with a heat-shrinkable protective pipe.

9. The porous anticorrosion heat-shrinkable sleeve heating device of claim 1, wherein the protection screens are arranged on four sides and the top surface of the heating device, so that workers can be prevented from touching the electromagnetic heating cylinder to scald the heating device, heat dissipation of an outer-layer electromagnetic coil of the electromagnetic heating cylinder is facilitated, and the electromagnetic coil is prevented from being burnt due to overheating.

10. The porous anticorrosion heat shrinkable sleeve heating device of 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.