Heating control methods and heating systems

Abstract

This invention relates to a pipeline anti-corrosion and patching system, and discloses a heating control method comprising the following steps: arranging a plurality of axial heating zones uniformly along the pipeline axis to surround a heat-shrinkable tape; dividing each axial heating zone into several circumferential heating zones along a clockwise direction, with the heating power of each circumferential heating zone decreasing sequentially from the 6 o'clock position to the 12 o'clock position; arranging heating elements within each circumferential heating zone; and controlling each axial heating zone to heat and shrink the heat-shrinkable tape according to a preset heating and shrinking control program, based on a preset heating power and heating time, so that the heat-shrinkable tape can shrink rapidly and uniformly from the center outwards. This method enables zoned heating and precise control of the heat-shrinkable tape, ensuring uniform heating and improving the installation quality and efficiency of the heat-shrinkable tape. Furthermore, this invention also relates to a heating system.

Description

Technical Field

[0001] This invention relates to a pipeline corrosion protection and repair system, specifically, to a heating control method. Furthermore, this invention also relates to a heating system. Background Technology

[0002] Most pipelines are constructed by sequentially welding multiple seamless steel pipes, resulting in weld seams between adjacent pipes. Since the weld seams are the least corrosion-resistant parts of the entire pipeline, it is necessary to perform anti-corrosion repair work at these weld seams to ensure smooth pipeline transportation. Heat-shrinkable tape coating is currently the most commonly used anti-corrosion repair method in oil and gas pipeline laying. The process includes sandblasting of the steel pipe for rust removal, application of epoxy primer, and installation of the heat-shrinkable tape. There are generally two installation methods: manual flame baking and automatic installation using infrared heating equipment. In engineering practice, both methods are widely used.

[0003] Manual flame heating is currently the most common method used for heat shrinkable tape corrosion protection and repair in China. During the operation, two or more people stand symmetrically on both sides of the steel pipe and use a propane flame to heat the heat shrinkable tape circumferentially from the center outwards, causing it to gradually and evenly shrink and wrap around the surface of the steel pipe. Heating is then continued for tempering, allowing the hot melt adhesive of the heat shrinkable tape to fully melt and adhere to the steel pipe. During installation, the shrinkage of the heat shrinkable tape is carefully observed, and wrinkles or air bubbles are promptly removed using a pressure roller. Manual flame heating for installing heat shrinkable tape has advantages such as simple procedures and low requirements for site conditions; however, it also has the following problems:

[0004] 1. Flame intensity, the location of the flame, the distance between the flame and the steel pipe, the heating sequence, and the effective heating time for each part all significantly affect the shrinkage of the heat shrink tape and the melting of the hot melt adhesive. In other words, the operator's skills and sense of responsibility directly determine the installation quality of the heat shrink tape. However, these parameters generally rely entirely on the operator's experience and visual observation for control, making precise temperature control difficult. This often results in uneven heating of the heat shrink tape, leading to insufficient melting of the hot melt adhesive and charring or carbonization of the backing material.

[0005] 2. When performing anti-corrosion repair on large-diameter pipelines, the heating of the top and bottom of the heat shrinkable tape is difficult due to the limitations of the height and arm span of the workers. This results in high labor intensity and low construction efficiency for the workers. In addition, insufficient or uneven heating can also have an adverse effect on the installation quality of the heat shrinkable tape.

[0006] 3. When working in low-temperature environments such as winter, the problem of insufficient melting of hot melt adhesive due to uneven heating caused by the low efficiency of flame heating and rapid heat loss will be more prominent, making it difficult to effectively guarantee the installation quality and work efficiency of heat shrink tape.

[0007] Compared to manual flame heating, infrared heating equipment better meets the installation requirements of heat shrinkable tape and overcomes the shortcomings of manual flame heating. It represents the future direction of heat shrinkable tape anti-corrosion repair technology. Compared to manual flame heating, it has the following advantages:

[0008] 1. Heating parameters are easy to control, resulting in high installation quality. Infrared heating equipment can automatically heat and install heat shrink tape according to preset parameters and methods. The heat shrink tape is heated evenly and the temperature is controllable, minimizing the impact of human factors and ensuring that the heat shrink tape shrinks evenly in sequence and the hot melt adhesive melts fully.

[0009] 2. Utilizing a zone heating method, installation efficiency is high. Densely arranged heating elements cover the entire anti-corrosion repair area, enabling large-area or even overall heating of the heat shrinkable tape. Compared to a single-point heat source like a flame, heating efficiency is significantly improved, with particularly noticeable effects on anti-corrosion repair of large-diameter pipelines.

[0010] 3. It reduces the number of workers, lowers labor intensity, and achieves inherent safety. Infrared heating equipment automates most of the installation process of heat shrink tape; at the same time, the output power of the equipment can be adjusted by selecting the heating element, avoiding the problem of needing to add workers to improve installation efficiency when manually heating heat shrink tape with flames.

[0011] Patent document CN201610179556.0 discloses a pipe corrosion repair device, the main features of which are: the heating blocks of the repair device are symmetrically and evenly arranged in three or five rows (or an odd number of rows) along the axial direction, and each row of rings is composed of evenly arranged heating blocks. When the device is working, the heating blocks in the middle row are used to heat the heat-shrinkable tape first, and then the heating blocks on both sides are used sequentially for heating. The heating process is temperature-controlled. However, the corrosion repair device involved in this patent lacks clear technical specifications for the heating blocks, only having axial heating zones without circumferential heating zones. Each row uses a single temperature sensor for centralized temperature control, the heating system lacks power adjustment function, and all heating blocks only have two states: on and off. This patent fails to effectively solve the problem of precise heating control for different parts of the heat-shrinkable tape, making the heat-shrinkable tape prone to wrinkles, air bubbles, overheating, or underheating.

[0012] Patent document CN201711217916.2 discloses a pipe jointing device, whose main features and contents are: the overall structure of the jointing device is an openable and closable annular support, which can rotate around the pipe. A second heating component is installed on the frame of a winding mechanism mounted on the support, and multiple infrared lamps are fixed on the infrared lamp holder of the second heating component. During operation, the second heating component rotates with the support, heating the adhesive layer of the jointing tape, which is then adhered to the pipe surface by a rotating adsorption roller. However, the jointing device involved in this patent lacks clear technical specifications for the infrared lamps of the second heating component, has no axial heating zone, and cannot meet the requirement of a gradual heating sequence from the center to both sides for heat shrinkable tape anti-corrosion jointing. Furthermore, the heating component is arranged in a specific position on the jointing device, which is generally only suitable for the winding installation of non-shrinkable jointing tape and cannot be used for the heating installation of heat shrinkable tape. Regarding the above-mentioned invention's description of its applicability to heat shrinkable tape installation, due to the axial temperature difference of the steel pipe, the axial temperature difference of the patch tape, and the inherent uneven irradiance of the heat shrinkable tape itself, severe wrinkles and air bubbles will inevitably occur during actual installation.

[0013] Patent documents CN201810129332.8 and CN201820224350.X disclose a pipe patching heating device. Its main features and contents are: the heating device is an annular structure composed of a fixed frame, a first rotatable frame, a second rotatable frame, and an opening / closing device. Dozens of ceramic electric heating plates are installed on the fixed frame, the first rotatable frame, and the second rotatable frame. Each frame is equipped with a temperature sensor for heating control, monitoring the heating temperature of each section. The pipe patching heating devices involved in these two patents lack descriptions of the heating zoning method, the main control circuit lacks power adjustment function, and all infrared heaters only have two states: on and off. In other words, the above inventions and utility models fail to effectively solve the problem of precise heating control for different parts of the heat shrinkable tape, making the heat shrinkable tape prone to wrinkles, air bubbles, overheating, or underheating.

[0014] Patent document CN201911303314.8 discloses a control method and system for mechanized patching of oil and gas pipelines. Its main features and contents are: the control method divides the patching area into three regions from the center outwards: a first heat-shrinkable zone, a second heat-shrinkable zone, and a third heat-shrinkable zone; when the control system is working, the heating control module controls the infrared heaters to heat the three regions sequentially from the center outwards; the heating process is controlled by heating temperature and heating time. The control method and system involved in this patent only have axial heating zones and no circumferential heating zones; the heating control system lacks power adjustment functionality; and all infrared heaters only have two states: on and off. In other words, the above invention fails to effectively solve the problem of precise heating control for different parts of the heat-shrinkable zone, and the heat-shrinkable zone is prone to wrinkles, air bubbles, overheating, or underheating.

[0015] In summary, the pipe repair methods and devices mentioned in the published patent documents can all repair pipes by using infrared heating. However, they all have the problem of not being able to accurately control the heating temperature of different parts of the heat shrinkable tape. Furthermore, due to the uneven heating of different parts of the heat shrinkable tape, it is easy for the heat shrinkable tape to wrinkle, contain air bubbles, or be overheated or underheated. Summary of the Invention

[0016] The technical problem to be solved by this invention is to provide a heating control method. This heating system can perform zoned heating and precise control of heat shrinkable tape, ensuring uniform heating of all parts of the heat shrinkable tape, avoiding wrinkles and blistering, and improving the installation quality and efficiency of pipeline heat shrinkable tape anti-corrosion repair. A second objective of this invention is to provide a heating system.

[0017] To address the aforementioned technical problems, the present invention provides a heating control method, comprising the following steps:

[0018] Several axial heating zones that can be uniformly arranged along the axial direction of the pipe and can be wrapped around the heat shrinkable strip of the pipe are arranged sequentially and evenly.

[0019] The axial heating zone is divided into several circumferential heating zones along the clock direction, and the heating power of each circumferential heating zone decreases sequentially from the circumferential heating zone centered at the six o'clock position to the circumferential heating zone centered at the twelve o'clock position. Heating elements are arranged in each circumferential heating zone.

[0020] According to the preset heating and shrinkage control program, each of the axial heating zones is controlled to heat and shrink the heat shrinkage strip according to the preset heating power and heating time, so that the heat shrinkage strip can shrink quickly and evenly from the center to both sides.

[0021] Furthermore, each of the axial heating zones is divided into a centrally located axial heating zone and several pairs of axial heating zones symmetrically arranged to both sides of the centrally located axial heating zone. The centrally located axial heating zone and the several pairs of axial heating zones symmetrically arranged to both sides of the centrally located axial heating zone are respectively controlled by the corresponding heating contraction control program to form several corresponding axial control zones. Each of the axial heating zones is divided into several circumferential control zones along the clock direction. The circumferential heating zones using the same heating parameters belong to the same circumferential control zone for control.

[0022] Furthermore, the heat shrink control procedure includes:

[0023] The heating and shrinkage control program heats the centrally located axial heating zone using a power control method that changes from high power to medium power and then to low power. It also heats the outermost axial heating zone using a power control method that changes from low power to medium power and then to high power. The remaining axial heating zones are heated using a power control method that changes from low power to high power and then to medium power or from medium power to high power and then to low power.

[0024] Furthermore, the heat shrink control program also includes:

[0025] The total output energy of the centrally located axial heating zone is used as the axial reference benchmark, and the total output energy of the remaining axial heating zones is set to 100%-150% of the axial reference benchmark. From the center to both sides, the total output energy of each axial heating zone increases sequentially.

[0026] Furthermore, the heating power ranges of the high power, medium power, and low power are respectively 60%-100%, 20-80%, and 0-40% of the rated power of the heating element in the circumferential heating zone centered at the six o'clock position in the axial heating zone.

[0027] Furthermore, the heat shrink control program also includes:

[0028] In one of the axial heating zones, the output power of the circumferential heating zone centered at the six o'clock position is the circumferential reference reference, and the heating power of the remaining circumferential heating zones is 75%-100% of the circumferential reference reference.

[0029] Furthermore, the heating shrinkage control program includes several sub-heating shrinkage control programs. Each axial control zone controls the corresponding axial heating zone to heat and shrink the heat shrinkage strip according to a preset heating power and heating time through the corresponding sub-heating shrinkage control program. The heating time of each sub-heating shrinkage control program is the same.

[0030] Furthermore, each of the axial heating zones is sequentially divided along the axial direction of the pipeline into a fourth axial heating zone, a second axial heating zone, a first axial heating zone, a third axial heating zone, and a fifth axial heating zone. The first axial heating zone is centrally located, the second and third axial heating zones are symmetrically arranged about the first axial heating zone, and the fourth and fifth axial heating zones are symmetrically arranged about the first axial heating zone. Each of the axial control zones is a first axial control zone, a second axial control zone, and a third axial control zone. The first axial heating zone is controlled by the first axial control zone, the second and third axial heating zones are controlled by the second axial control zone, and the fourth and fifth axial heating zones are controlled by the third axial control zone.

[0031] Furthermore, the heating and shrinking control program includes a first sub-heating and shrinking control program, a second sub-heating and shrinking control program, and a third sub-heating and shrinking control program. The first sub-heating and shrinking control program is used to control the first axial control area, the second sub-heating and shrinking control program is used to control the second axial control area, and the third sub-heating and shrinking control program is used to control the third axial control area.

[0032] Furthermore, the axial heating zone is divided into a sixth circumferential heating zone, a fourth circumferential heating zone, a second circumferential heating zone, a first circumferential heating zone, a third circumferential heating zone, a fifth circumferential heating zone, a seventh circumferential heating zone, and an eighth circumferential heating zone, with the two o'clock, three o'clock, four-and-a-half o'clock, six o'clock, seven-and-a-half o'clock, nine o'clock, ten o'clock, and twelve o'clock directions as the centers. The third and second circumferential heating zones are symmetrically arranged about the first circumferential heating zone, the fifth and fourth circumferential heating zones are symmetrically arranged about the first circumferential heating zone, and the sixth and seventh circumferential heating zones are symmetrically arranged about the first circumferential heating zone.

[0033] Furthermore, the circumferential control area includes a first circumferential control area, a second circumferential control area, a third circumferential control area, a fourth circumferential control area, a fifth circumferential control area, and a sixth circumferential control area. The first circumferential control area controls the first circumferential heating area, the second circumferential control area controls the third circumferential heating area and the second circumferential heating area, the third circumferential control area controls the fifth circumferential heating area and the fourth circumferential heating area, the fourth circumferential control area controls the sixth circumferential heating area, the fifth circumferential control area controls the seventh circumferential heating area, and the sixth circumferential control area controls the eighth circumferential heating area.

[0034] Furthermore, each of the circumferential heating zones is provided with a heating element whose radial position is adjustable. The heating elements on two adjacent axial heating zones are arranged in a staggered manner, and the length direction of the heating element is parallel to the length direction of the pipe.

[0035] Furthermore, each of the aforementioned circumferential heating zones is also equipped with a temperature detection device.

[0036] Furthermore, according to the preset tempering control program, each of the axial heating zones is controlled to temper the heat shrinkable strip according to the preset heating power and heating time.

[0037] Another aspect of the present invention discloses a heating system, including a heating controller and a heater. The heating controller stores a heating shrinkage control program and a tempering control program. The heater is provided with a plurality of axial heating zones. Each axial heating zone is divided into a plurality of circumferential heating zones along the clock direction. Heating elements are arranged in each of the circumferential heating zones. The heating controller is wirelessly connected to each of the heating elements to control each axial heating zone to heat and shrink the heat shrinkable strip according to a preset heating power and heating time, so that the heat shrinkable strip can shrink rapidly and uniformly from the center to both sides.

[0038] The beneficial effects of the present invention through the above technical solution are as follows:

[0039] The first aspect of this invention provides a heating control method, comprising a plurality of axial heating zones evenly arranged along the axial direction of a pipe on a heat shrinkable tape that can be wrapped around the pipe. Each axial heating zone is divided into a plurality of circumferential heating zones along the circumferential direction and according to the clockwise direction. The heating power of the circumferential heating zone centered at the six o'clock position decreases sequentially from the circumferential heating zone centered at the twelve o'clock position. Heating elements are also arranged on each circumferential heating zone. According to a preset heating and shrinkage control program, each axial heating zone is controlled to heat and shrink the heat shrinkable tape according to a preset heating power and heating time, so that the heat shrinkable tape can shrink rapidly and evenly from the center to both sides. This heating control method can perform zoned heating and control of the heat shrinkable tape, ensuring that all parts of the heat shrinkable tape are heated evenly, avoiding wrinkles and blistering, and improving the installation quality and efficiency of pipe heat shrinkable tape anti-corrosion repair.

[0040] A second aspect of this invention provides a heating system, including a heating controller and a heater. The heating controller stores a heating shrinkage control program and a tempering control program. The heater has several axial heating zones, each axial heating zone being divided into several circumferential heating zones along a clockwise direction. Heating elements are arranged in each circumferential heating zone. The heating controller is wirelessly connected to each heating element to control each axial heating zone to heat and shrink the heat shrinkable tape according to a preset heating power and heating time, so that the heat shrinkable tape can shrink rapidly and uniformly from the center to both sides. This system can divide and control the heating of the heat shrinkable tape on the pipeline, ensuring uniform heating of all parts of the heat shrinkable tape, avoiding wrinkles and blistering, and improving the installation quality and efficiency of the heat shrinkable tape anti-corrosion repair of the pipeline.

[0041] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0042] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0043] Figure 1 This is a flowchart of the heating control method in a specific embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram showing the arrangement of the axial control area, axial heating area, and heating element in a specific embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the arrangement of the circumferential control area and the circumferential heating area in a specific embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the heating system in a specific embodiment of the present invention.

[0047] Explanation of reference numerals in the attached figures

[0048] 1. Pipeline 2. Main body anti-corrosion layer

[0049] 3. Heat shrink tape 4. Heater

[0050] 45 Temperature detection device 5 Heating controller

[0051] E heating element A1 first axial control zone

[0052] A2 Second Axial Control Zone; A3 Third Axial Control Zone

[0053] A11 First Axial Heating Zone; A21 Second Axial Heating Zone

[0054] A22 Third Axial Heating Zone; A31 Fourth Axial Heating Zone

[0055] A32 Fifth Axial Heating Zone C1 First Circumferential Control Zone

[0056] C2 Second Ring Control Zone C3 Third Ring Control Zone

[0057] C4 Fourth Ring Control Zone; C5 Fifth Ring Control Zone

[0058] C6 Sixth Ring Control Zone, C11 First Ring Heating Zone

[0059] C21 Second circumferential heating zone; C22 Third circumferential heating zone

[0060] C31 Fourth Circular Heating Zone; C32 Fifth Circular Heating Zone

[0061] C41 Sixth Ring Heating Zone; C51 Seventh Ring Heating Zone

[0062] C61 Eighth Circular Heating Zone Detailed Implementation

[0063] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention, and the scope of protection of the present invention is not limited to the specific embodiments described below.

[0064] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "provided with," "divided," "arranged," and "distributed" should be interpreted broadly. For example, a connection can be a direct connection or an indirect connection through an intermediate medium; it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate connector; it can be a connection within two elements or an interaction between two elements; or it can be a communication connection through signals. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] Furthermore, the terms “first,” “second,” etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with “first,” “second,” etc., may explicitly or implicitly include one or more of the stated features.

[0066] In this invention, unless otherwise stated, directional terms such as "both sides" are defined with respect to the sides of the corresponding component, "center" is defined with respect to the direction of use of the heating controller 5, and "axial" is defined with respect to the arrangement direction of the pipe 1 provided by this invention. Specifically, in the accompanying drawings provided by this invention, the orientations or positional relationships used are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention; the directional terms of this invention should be understood in conjunction with the actual installation state.

[0067] See Figures 1 to 3 The present invention provides a heating control method, comprising the following steps:

[0068] Several axial heating zones that can be uniformly arranged along the axial direction of pipe 1 and can be wrapped around the heat shrinkable strip 3 of pipe 1 are arranged sequentially.

[0069] Several circumferential heating zones are divided along the clock direction on each axial heating zone, and the heating power of each circumferential heating zone decreases sequentially from the circumferential heating zone centered at the six o'clock position to the circumferential heating zone centered at the twelve o'clock position. Heating elements E are arranged in each circumferential heating zone.

[0070] According to the preset heating and shrinkage control program, the heating zones of each axis are controlled to heat and shrink the heat shrinkable belt 3 according to the preset heating power and heating time, so that the heat shrinkable belt 3 can shrink quickly and evenly from the center to both sides.

[0071] It should be noted that the specific order of the above method steps can be set according to the actual use environment. Specifically, it can be applied to the baking and installation of heat shrinkable tape 3 for anti-corrosion repair of steel pipelines such as oil and gas pipelines, centralized heating pipelines, and urban water supply pipelines.

[0072] To better illustrate the heating control method provided by the present invention, a specific embodiment is described below:

[0073] First, several axial heating zones that can surround the outer side of the heat shrinkable band 3 on the outer circumference of the pipe 1 are arranged evenly along the axial direction of the pipe 1.

[0074] Secondly, each axial heating zone is divided into several circumferential heating zones along the clock direction. Furthermore, from the circumferential heating zone centered at the six o'clock position to the circumferential heating zone centered at the twelve o'clock position, the heating power of each circumferential heating zone decreases sequentially. Heating elements E are arranged in each circumferential heating zone.

[0075] Finally, according to the heating and shrinking control program pre-programmed based on the heat shrinkable tape 3 and the usage environment, the axial heating zone is controlled to heat and shrink the heat shrinkable tape 3 according to the preset heating power and heating time, so that the heat shrinkable tape 3 can shrink evenly from the center to both sides.

[0076] It should be noted that "according to the clock direction" in the above specific embodiments can be understood as referring to... Figure 3 As shown, the circumferential heating zone is divided according to the clock direction of a commonly used clock, combined with... Figure 1 and Figure 4 Axial heating zones are arranged evenly along the axial direction of pipe 1, and each axial heating zone is further divided into several circumferential heating zones. Figure 2 The diagram shows the distribution of the heating zones. It can be seen that the axial and circumferential heating zones work together to form a matrix arrangement, dividing the heat shrinkable tape 3 installed on the outside of pipe 1 into zones. Each zone has a corresponding heating element E to heat it, ensuring more uniform and thorough heating of the heat shrinkable tape 3. A preset heating and shrinkage program controls each axial and circumferential heating zone, achieving precise control and avoiding insufficient or excessive heating. This not only improves the efficiency of the heat shrinkable tape 3 installation but also ensures rapid and uniform shrinkage from the center outwards, preventing wrinkles and air bubbles, further improving installation quality.

[0077] It should also be noted that the heating shrink program can set the heating power and heating time of the heating zone. The specific parameter settings need to be set according to the specific object to be heated, the environment in which it is installed and used, and its own materials.

[0078] Furthermore, as a specific embodiment of the present invention, the axial heating zone can be divided, with a centrally located axial heating zone as the center, and several axial heating zones evenly arranged on both sides of the centrally located axial heating zone. Each pair of axial heating zones with the centrally located axial heating zone as the center of symmetry forms a group. The centrally located axial heating zone and each group of axial heating zones are controlled by corresponding heating shrinkage control programs to form several axial control zones. Each axial heating zone is divided into several circumferential control zones along the clock direction. Circumferential heating zones using the same heating parameters are controlled by the same circumferential control zone. In this way, not only is the heating area reasonably divided, but each divided heating zone can also be controlled individually, improving control accuracy and heating accuracy, and avoiding wrinkles and air bubbles caused by insufficient or excessive heating temperature.

[0079] Furthermore, the heating shrinkage program can use a heating power control method that controls the centrally located axial heating zone from high power to medium power to low power, and a heating power control method that controls the outermost axial heating zone from low power to medium power and then to high power, while the remaining axial heating zones can use a heating power control method that controls the zone from low power to high power and then to medium power or from medium power to low power and then to high power. By employing a multi-stage heating power control method, the heat shrinkable tape 3 is heated sufficiently and uniformly in all directions during the heating process. It is understood that when the central axial heating zone is heated with high power, its temperature will diffuse to the surrounding areas. If adjacent axial heating zones also use high power, the heat shrinkable tape 3 will be heated too high, resulting in excessive shrinkage. Conversely, when the central axial heating zone is heated with low power, if adjacent axial heating zones also use low power, the heating temperature will be too low, preventing the heat shrinkable tape 3 from shrinking. However, using the three-stage heating method mentioned in this invention, adjacent axial heating zones use different powers, thus uniformly distributing the temperature of the heat shrinkable tape 3. This prevents the heat shrinkable tape 3 from shrinking rapidly and uniformly from the center outwards, without wrinkles or bubbles, ensuring the backing material of the heat shrinkable tape 3 is not charred or carbonized, and allowing the hot melt adhesive to fully melt and evenly overflow along the edges.

[0080] Furthermore, in order to ensure the normal operation of the heating shrinkage control program and that the heat shrinkage belt 3 can shrink normally after being heated, the heating shrinkage control program needs to follow the energy ratio principle, that is, the total output energy of the centrally located axial heating zone is used as the axial reference benchmark, and the total output energy of the other axial heating zones is set to 100%-150% of the axial reference benchmark. From the middle to both sides, the total output energy of each axial heating zone increases sequentially.

[0081] Furthermore, as a specific embodiment of the present invention, the heating power ranges of high power, medium power and low power are 60%-100%, 20-80% and 0-40% of the rated power of the heating element E in the circumferential heating zone centered at the six o'clock position in the corresponding axial heating zone.

[0082] It should be noted that the above specific implementation method is only one specific implementation method of the present invention. In actual operation, not only can a three-stage heating power control method be adopted, but also a four-stage or five-stage method can be adopted. As long as the temperature of each part of the heat shrinkable tape 3 reaches a balance at the same time, and the heat shrinkable tape 3 can shrink normally, the installation of the heat shrinkable tape 3 for the anti-corrosion repair of the pipeline 1 can be completed.

[0083] Furthermore, when setting the heating shrinkage control program, the heating power settings for each circumferential heating zone also need to follow the power ratio principle. That is, in an axial heating zone, the output power of the circumferential heating zone centered at the six o'clock position is the circumferential reference benchmark, and the heating power of the remaining circumferential heating zones is 75%-100% of the circumferential reference benchmark.

[0084] In summary, the heating control method provided by the present invention, when setting the heating power of the axial heating zone and the circumferential heating zone, i.e., when presetting the heating shrinkage control program, needs to follow the principles of energy ratio and power ratio to avoid insufficient or uneven heating, which would prevent the heat shrinkage tape 3 from being installed normally.

[0085] Furthermore, as a specific embodiment of the heating and shrinking control program in this invention, the heating and shrinking control program includes several sub-heating and shrinking control programs. Each axial control zone controls the corresponding axial heating zone to heat and shrink the heat shrinkable tape 3 according to a preset heating power and heating time through the corresponding sub-heating and shrinking control program. The heating time of each sub-heating and shrinking control program is the same. By controlling the corresponding axial heating zone through each sub-heating and shrinking control program, the heating and shrinking of the heat shrinkable tape 3 is completed while ensuring that the heating time of each sub-heating and shrinking control program is the same. This ensures both the installation efficiency and the installation quality of the heat shrinkable tape 3.

[0086] As one specific embodiment of the present invention, see Figure 2 and Figure 3 The axial heating zones, evenly distributed along the axis of pipe 1, can be divided into a fourth axial heating zone A31, a second axial heating zone A21, a first axial heating zone A11, a third axial heating zone A22, and a fifth axial heating zone A32. The first axial heating zone A11 is centrally located; the second and third axial heating zones A21 and A22 are symmetrically arranged about the first axial heating zone A11; and the fourth and fifth axial heating zones A31 and A32 are symmetrically arranged about the first axial heating zone A11. Each axial control zone is designated as the first axial control zone A1, the second axial control zone A2, and the third axial control zone A3. The first axial heating zone A11 is controlled by the first axial control zone A1; the second and third axial heating zones A21 and A22 are controlled by the second axial control zone A2; and the fourth and fifth axial heating zones A31 and A32 are controlled by the third axial control zone A3. In this specific embodiment, five axial heating zones are arranged to provide sufficient and uniform heating to the heat-shrinkable tape 3.

[0087] It should be noted that the number of axial heating zones should be no less than five, and can be five, seven, or nine, depending on the specific application environment. The total number of axial heating zones can be odd or even. When the number of axial heating zones is odd, the arrangement of each axial heater and its contact area with the heat shrinkable tape 3 should be the same. Except for the centrally located axial heating zone, which is controlled by one axial control zone, the remaining axial heating zones are grouped together, with each pair symmetrical about the centrally located zone being controlled by the same axial control zone. If the number of axial heating zones is even, the two centrally located axial heating zones should be grouped together and controlled by the same axial control zone. The axial heating zones on either side of these zones should be symmetrical, and each pair of symmetrically located axial heating zones should be controlled by the same axial control zone. However, it is important to ensure that the heating area of ​​each axial heating zone on the heat shrinkable tape 3 is evenly divided to guarantee uniform heating.

[0088] Furthermore, when setting the heating and shrinkage control program, as in the specific embodiment described above, five axial heating zones are set, corresponding to three axial control zones. Therefore, the heating and shrinkage control program is also set as three subroutines that can be started and stopped simultaneously. These are the first sub-heating and shrinkage control program that can control the first axial control zone A1, the second sub-heating and shrinkage control program that can control the second axial control zone A2, and the third sub-heating and shrinkage control program that can control the third axial control zone A3. The three subroutines respectively adopt the corresponding three-stage heating control method to control the corresponding axial heating zone for heating through axial control.

[0089] As a specific embodiment of the above subroutines, the first sub-heating shrinkage control program uses a heating power setting from high power to medium power and then to low power; the second sub-heating shrinkage control program uses a heating power setting from medium power to high power and then to low power; and the third sub-heating shrinkage control program uses a heating power setting from low power to medium power and then to high power. It should be noted that when setting the power, the heating time using the power can be set according to the power level to ensure uniform heating of the heat shrinkable belt 3. However, it is necessary to control the three subroutines to start and end at the same time, and to follow the energy ratio principle. The total output energy of the centrally located axial heating zone is used as the reference benchmark, and the total output energy of the other axial heating zones is 100%-150% of the reference benchmark. From the center to both sides, the total output energy of each axial heating zone increases sequentially.

[0090] It should be noted that, taking the above specific implementation as an example, the total output energy of each axial heating zone in the shrinkage control program follows the following energy ratio principle: with the total output energy of the first axial heating zone A11 as the benchmark, the total output energy of the second axial heating zone A21 and the third axial heating zone A22 is 100%-120% of that of the first axial heating zone A11, and the total output energy of the fourth axial heating zone A31 and the fifth axial heating zone A32 is 110%-150% of that of the first axial heating zone A11.

[0091] Furthermore, the axial heating zone is divided along the circumference with the two o'clock, three o'clock, four-and-a-half, six o'clock, seven-and-a-half, nine o'clock, ten o'clock, and twelve o'clock directions as the centers, into the sixth circumferential heating zone C41, the fourth circumferential heating zone C31, the second circumferential heating zone C21, the first circumferential heating zone C11, the third circumferential heating zone C22, the fifth circumferential heating zone C32, the seventh circumferential heating zone C51, and the eighth circumferential heating zone C61. The third circumferential heating zone C22 and the second circumferential heating zone C21 are symmetrically arranged about the first circumferential heating zone C11, the fifth circumferential heating zone C32 and the fourth circumferential heating zone C31 are symmetrically arranged about the first circumferential heating zone C11, and the sixth circumferential heating zone C41 and the seventh circumferential heating zone C51 are symmetrically arranged about the first circumferential heating zone C11. This division of the heating zone within the axial heating zone allows for more reasonable and balanced control of the temperature received by each part of the heat shrinkable tape 3, ensuring that the heat shrinkable bag is fully heated during the heating and shrinking process and shrinks rapidly from the center outwards.

[0092] Specifically, each annular heating zone is controlled by an annular control zone. Taking the above specific implementation as an example, the annular control zone includes a first annular control zone C1, a second annular control zone C2, a third annular control zone C3, a fourth annular control zone C4, a fifth annular control zone C5, and a sixth annular control zone C6. The first annular control zone C1 controls the first annular heating zone C11, the second annular control zone C2 controls the third annular heating zone C22 and the second annular heating zone C21, the third annular control zone C3 controls the fifth annular heating zone C32 and the fourth annular heating zone C31, the fourth annular control zone C4 controls the fourth annular heating zone C31, the fifth annular control zone C5 controls the seventh annular heating zone C51, and the sixth annular control zone C6 controls the eighth annular heating zone C61. When setting the heating parameters for each circumferential heating zone, the power ratio principle must be followed. The output power of the circumferential control zone centered at the six o'clock position is used as the reference benchmark. The output power of the heating element E in the other circumferential control zones of the axial control zone is 75%-100% of the reference benchmark. The higher the position of the circumferential control zone, the lower the heating power. "The higher the position" means that the heating power of the circumferential heating zone gradually decreases from the six o'clock position to the twelve o'clock position.

[0093] It should be noted that the arrangement of the circumferential heating zones is not limited to the specific implementation methods described above. The division of the circumferential heating zones can be set according to the specific usage environment. However, it should be noted that the division of the circumferential heating zones must include circumferential heating zones centered at the two o'clock position, the six o'clock position, the ten o'clock position, and the twelve o'clock position. The circumferential heating zone centered at the ten o'clock position can heat the overlapping parts of the heat shrinkable tape 3 itself. In addition, the circumferential heating zones centered at the two o'clock position, the six o'clock position, the ten o'clock position, and the twelve o'clock position all need to be controlled separately through their respective corresponding circumferential control zones.

[0094] It should also be noted that, taking the above specific implementation as an example, the heating power of the heating element E in each circumferential control zone in the shrinkage control program follows the following power ratio principle: based on the power of the heating element E in the first circumferential control zone C1, the heating power of the heating elements E in the second circumferential control zone C2, the third circumferential control zone C3, the fourth circumferential control zone C4, the fifth circumferential control zone C5, and the sixth circumferential control zone C6 is 85%-100%, 85%-100%, 80%-95%, 80%-95%, and 75%-90% of the heating power of the heating element E in the first circumferential control zone C1 in the axial heating zone, respectively.

[0095] Furthermore, to achieve better heating, each circumferential heating zone is equipped with radially adjustable heating elements E. The heating elements E in adjacent axial heating zones are staggered, with the length of each element parallel to the length of the pipe 1. This staggered arrangement ensures more uniform heating of the heat shrinkable tape 3, preventing excessive temperature differences between the gap between adjacent heating elements E and the location of the heating element E, which could negatively impact the heating effect. Secondly, the adjustable arrangement of the heating elements E within the axial heating zone allows for adjustment of the circumferential heating zone division. Thus, this invention is applicable to the installation of various heat shrinkable tapes 3 in various environments. When adjustment is needed, only the position of the heating element E and its corresponding circumferential control zone need to be controlled. The heating shrinkage control program can individually control and set each circumferential and axial heating zone, preventing a malfunction in one heating zone from affecting the overall installation and use of the heat shrinkable tape 3.

[0096] It should be noted that the heating elements E on two adjacent axial heating zones can not only be arranged in a staggered manner, but the specific arrangement can also be changed according to the specific usage environment by adjusting the position of the heating elements E on the axial heating zone.

[0097] It should also be noted that the heating element E can not only be adjustablely installed on the axial heating zone, but also has a power adjustment module. Each heating unit has an independent power adjustment module. During use, if a heating element E in a certain heating zone malfunctions, the heating power of several adjacent heating elements E can be adjusted through the power adjustment module to compensate for the insufficient heating temperature in the missing heating area of ​​the damaged heating element E. In addition, the length direction of the heating element E can be parallel to or perpendicular to the axial direction of the pipe 1. Parallel or perpendicular arrangement can make the distribution of heating elements E more uniform, ensuring that all parts of the heat shrinkable tape 3 are heated evenly during operation.

[0098] Furthermore, as a specific embodiment of the present invention, see [link to relevant documentation]. Figure 4 Temperature detection devices 54 are installed in each circumferential heating zone to monitor the real-time temperature of the area, thereby adjusting and monitoring the heating parameters of each circumferential heating zone to ensure the accuracy and efficiency of the heating and shrinking process.

[0099] In a preferred embodiment of the present invention, the heating element E is preferably a quartz lamp tube capable of infrared heating. The infrared wavelength range radiated by this quartz lamp tube needs to be 1.1μm-1.4μm, and the quartz lamp tube is coated with a coating whose reflectivity to infrared light is not less than 70%. The coating process of the quartz lamp tube is gold plating, or white plating. The heating wire of this quartz lamp tube is preferably tungsten wire or carbon fiber. It should be noted that when selecting a quartz lamp tube as the heating element E, the length direction of the quartz lamp tube needs to be parallel to the axis of the pipe 1.

[0100] Furthermore, as a specific embodiment of the present invention, after the heat shrinkable tape 3 has been heated and shrunk, it can be tempered according to a preset tempering control program. Specifically, the preset tempering control program controls the heating zones of each axis to temper the heat shrinkable tape 3 according to preset heating power and heating time. Tempering can reduce the stress on the heat shrinkable tape 3 and reduce the risk of damage or deformation during subsequent use.

[0101] A second aspect of the invention also provides a heating system, see [link to relevant documentation]. Figure 4 It includes a heating controller 5 and a heater 4. The heating controller 5 stores a heating shrinkage control program and a tempering control program. The heater 4 is as follows: Figure 4 The illustrated circular mechanical structure includes several axial heating zones within the heater 4. Each axial heating zone is further divided into several circumferential heating zones along a clockwise direction. Heating elements E are arranged within each circumferential heating zone. The heating controller 5 is wirelessly connected to each heating element E to control the axial heating zones to heat and shrink the heat shrinkable strip 3 according to preset heating power and heating time, ensuring that the heat shrinkable strip 3 shrinks rapidly and uniformly from the center outwards. A pre-programmed heating shrinkage control program and a tempering control program with pre-set heating parameters are input into the heating controller 5. The heating controller 5, through wireless communication with the heater 4, precisely controls each axial and circumferential control zone, ensuring that each axial and circumferential heating zone heats and shrinks the heat shrinkable strip 3 according to preset heating power and heating time, allowing the heat shrinkable strip 3 to shrink rapidly and uniformly from the center outwards.

[0102] Furthermore, the heating controller 5 can wirelessly communicate with the temperature detection device 54 to detect the real-time heating temperature of each area of ​​the heater 4. By using the heating temperature as feedback data for the heating effect and the average output energy of each heating zone as auxiliary feedback data, the heating parameters can be corrected to make the heating temperature more accurate. This achieves precise control of the heating zone, ensuring the installation efficiency and quality of the heat shrinkable tape 3. The temperature detection device 54 can be a temperature sensor.

[0103] Secondly, in order to better understand the technical solution and usage method of the present invention, the preferred embodiments are described below in conjunction with relatively comprehensive preferred technical features.

[0104] Combination Figures 1 to 4 The heat shrinkable tape 3 is installed on the anti-corrosion repair of pipe 1. A main anti-corrosion layer 2 is set on the outer circumference of pipe 1, and then the heat shrinkable tape 3 is installed on the outside of the main anti-corrosion layer 2. The heating control method provided in the first aspect of the present invention is applied to... Figure 4 The heating system in the pipeline 1 includes a heating control device 5 and a heater 4. The heating system employs the heating control method provided by this invention. The heating shrinkage control program and tempering control program are pre-set in the heating control device 5. The heater 4 has five axial heating zones, evenly arranged sequentially along the axial direction of the pipeline 1. Figure 2 As shown, the heating zones are a fourth axial heating zone A31, a second axial heating zone A21, a first axial heating zone A11, a third axial heating zone A22, and a fifth axial heating zone A32. The first axial heating zone A11 is centrally located and controlled by a first axial control zone A1. The second and third axial heating zones A21 and A22 are symmetrically arranged about the first axial heating zone A11 and are both controlled by a second axial control zone A2. The fourth and fifth axial heating zones A31 and A32 are symmetrically arranged about the first axial heating zone A11 and are both controlled by a third axial control zone A3. (See also...) Figure 3Each axial control zone is divided along the circumference with centers at the two o'clock, three o'clock, four-thirty, six o'clock, seven-thirty, nine o'clock, ten o'clock, and twelve o'clock directions, into the following sequentially defined circumferential heating zones: the sixth circumferential heating zone C41, the fourth circumferential heating zone C31, the second circumferential heating zone C21, the first circumferential heating zone C11, the third circumferential heating zone C22, the fifth circumferential heating zone C32, the seventh circumferential heating zone C51, and the eighth circumferential heating zone C61. The third circumferential heating zone C22 and the second circumferential heating zone C21 are symmetrically arranged about the first circumferential heating zone C11, and the fifth circumferential heating zone C32 and the fourth circumferential heating zone C31 are symmetrically arranged about the first circumferential heating zone C11. The sixth circumferential heating zone C41 is symmetrically arranged about the first circumferential heating zone C11. The seventh circumferential heating zone C51 is symmetrically arranged about the first circumferential heating zone C11. The first circumferential heating zone C11 is controlled by the first circumferential control zone C1; the second circumferential heating zone C21 and the third circumferential heating zone C22 are controlled by the second circumferential control zone C2; ​​the fourth circumferential heating zone C31 and the fifth circumferential heating zone C32 are controlled by the third circumferential control zone C3; the sixth circumferential heating zone C41 is controlled by the fourth circumferential heating zone C31; the seventh circumferential heating zone C51 is controlled by the fifth circumferential control zone C5; and the eighth circumferential heating zone C61 is controlled by the sixth circumferential control zone C6. Specifically, the correspondence between each axial heating zone, axial control zone, circumferential heating zone, and circumferential control zone is shown in Tables 1 and 2.

[0105] Table 1. Correspondence between circumferential heating zone and axial heating zone

[0106]

[0107] Table 2. Correspondence between circumferential control zone and axial control zone

[0108]

[0109] Quartz lamps serving as heating elements E are arranged within each circumferential heating zone. Heating elements E in adjacent axial heating zones are arranged in a staggered pattern, with the length direction of heating element E parallel to the axial direction of pipe 1. A temperature detection device 54 is also installed within each circumferential heating zone. The temperature detection device 54 is wirelessly connected to the heating controller 5 to reflect real-time temperature changes within its respective circumferential heating zone. Heating shrinkage control programs and tempering control programs are programmed within the heating control device 5. These programs control the heating power and temperature of each circumferential and axial heating zone. The heating time is set. In this preferred embodiment, the heating shrinkage control program includes a first sub-heating shrinkage control program, a second sub-heating shrinkage control program, and a third sub-heating shrinkage control program. The first sub-heating shrinkage control program is used to control the first axial control area A1, the second sub-heating shrinkage control program is used to control the second axial control area A2, and the third sub-heating shrinkage control program is used to control the third axial control area A3. The parameters of the first sub-heating shrinkage control program are set based on the rated power of the heating element E of the first circumferential heating area C11 in the first axial heating area A11. In the three heating stages of the control program, the heating power of heating element E is sequentially set to 80%, 50%, and 10% of its rated power, corresponding to heating times accounting for 50%, 37.5%, and 12.5% ​​of the total running time of the sub-shrinkage control program, respectively. The parameters of the second sub-heating shrinkage control program are set based on the rated power of heating element E in the first circumferential heating zone C11 of the second axial heating zone A21 or the third axial heating zone A22. In the three heating stages of the second sub-shrinkage control program, the heating power of heating element E is sequentially set to 50%, 80%, and 10% of its rated power. The corresponding heating times account for 18.75%, 68.75%, and 12.5% ​​of the total running time of the sub-shrinkage control program, respectively. The parameter settings of the third sub-heating shrinkage control program are based on the rated power of the heating element E in the first circumferential heating zone C11 in the fourth axial heating zone A31 or the fifth axial heating zone A32. In the three heating stages of the third sub-shrinkage control program, the heating power of the heating element E is set to 20%, 60%, and 90% of its rated power, respectively, and the corresponding heating times account for 12.5%, 31.25%, and 56.25% of the total running time of the shrinkage control program, respectively.

[0110] Furthermore, the heating power settings of the second circumferential control zone C2, the third circumferential control zone C3, the fourth circumferential control zone C4, the fifth circumferential control zone C5, and the sixth circumferential control zone C6 in each axial heating zone are 98%, 95%, 92%, 90%, and 88% of the rated power of the heating element E in the first circumferential control zone C1, respectively.

[0111] It should be noted that the total heating run time is the same for the first sub-heating shrinkage control program, the second sub-heating shrinkage control program, and the third sub-heating shrinkage control program.

[0112] Furthermore, the tempering control program is also set based on the heating element E in the first circumferential heating zone C11 within the first axial heating zone A11. The output power of the heating element E in the first axial control zone A1 is set to 40% of its rated power, the output power of the heating element E in the second axial control zone A2 is set to 44% of its rated power, and the output power of the heating element E in the third axial control zone A3 is set to 49% of its rated power. The heating power of the heating elements E in the second circumferential control zone C2, the third circumferential heating zone C22, the fourth circumferential control zone C4, the fifth circumferential heating zone C32, and the sixth circumferential control zone C6 can be set to 98%, 95%, 92%, 90%, and 88% of the heating power of the heating element E in the first circumferential control zone C1 of their respective axial control zones. The running time of the tempering control program is 15% of the total running time of the heating shrinkage control program. Specifically, the settings for heating time and heating power are shown in Table 3.

[0113] Table 3. Parameter settings and operation flow of the heat shrinkage control program and tempering control program.

[0114]

[0115]

[0116] Tests have shown that, according to the parameters set in Table 3, the present invention can ensure that the maximum temperature difference of each heated zone of the heat shrinkable tape 3 is less than 10°C, and the peel strength deviation of each heated zone of the heat shrinkable tape 3 does not exceed 15%.

[0117] The heating control method provided by this invention can divide the heating area of ​​the heat shrinkable tape 3 and perform precise individual control on each divided area to ensure that the heat shrinkable tape 3 can shrink quickly and evenly from the center to both sides, without wrinkles or bubbles, without scorching or carbonization of the backing material of the heat shrinkable tape 3, and with the hot melt adhesive of the heat shrinkable tape 3 fully melted and evenly overflowing along the edge, thereby improving the efficiency and quality of the installation of the heat shrinkable tape 3.

[0118] In the description of this invention, references to terms such as "one embodiment," "some embodiments," and "a specific implementation" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this invention, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0119] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0120] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0121] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A heating control method, characterized in that, Includes the following steps: Several axial heating zones that can be uniformly arranged along the axial direction of the pipe (1) on the heat shrinkable strip (3) that can surround the pipe (1); The axial heating zone is divided into several circumferential heating zones along the clock direction, and the heating power of each circumferential heating zone decreases sequentially from the circumferential heating zone centered at the six o'clock position to the circumferential heating zone centered at the twelve o'clock position. Heating elements (E) are arranged in each circumferential heating zone. According to the preset heating and shrinkage control program, each of the axial heating zones is controlled to heat and shrink the heat shrinkable strip (3) according to the preset heating power and heating time, so that the heat shrinkable strip (3) can shrink rapidly and evenly from the center to both sides. The heating and shrinkage control program includes: heating the centrally located axial heating zone using a heating power control method that changes from high power to medium power and then to low power; heating the outermost axial heating zone using a control method that changes from low power to medium power and then to high power; and heating the remaining axial heating zones using a control method that changes from low power to high power and then to medium power or from medium power to high power and then to low power. Each of the axial heating zones is divided into a centrally located axial heating zone and several pairs of axial heating zones symmetrically arranged to both sides of the centrally located axial heating zone. The centrally located axial heating zone and the several pairs of axial heating zones symmetrically arranged to both sides of the centrally located axial heating zone are controlled by corresponding heating shrinkage control programs to form several corresponding axial control zones. Each of the axial heating zones is divided into several circumferential control zones along the clock direction. Circumferential heating zones with the same heating parameters belong to the same circumferential control zone. The heating shrinkage control program includes a first sub-heating shrinkage control program, a second sub-heating shrinkage control program, and a third sub-heating shrinkage control program. The first sub-heating shrinkage control program, the second sub-heating shrinkage control program, and the third sub-heating shrinkage control program are set to start and end simultaneously. The first sub-heating shrinkage control program, the second sub-heating shrinkage control program, and the third sub-heating shrinkage control program are configured with corresponding axial control zones. The axial control zones control the corresponding axial heating zones to heat shrink the heat shrinkage strip (3) according to preset heating power and heating time through the corresponding sub-heating shrinkage control programs.

2. The heating control method according to claim 1, characterized in that, The heat shrink control program also includes: The total output energy of the centrally located axial heating zone is used as the axial reference benchmark. The total output energy of the remaining axial heating zones is set to 100%-150% of the axial reference benchmark. From the center to both sides, the total output energy of each axial heating zone increases sequentially.

3. The heating control method according to claim 2, characterized in that, The high-power, medium-power, and low-power heating power ranges are respectively 60%-100%, 20-80%, and 0-40% of the rated power of the heating element (E) in the circumferential heating zone centered at the six o'clock position in the axial heating zone.

4. The heating control method according to claim 3, characterized in that, The heat shrink control program also includes: In one of the axial heating zones, the output power of the circumferential heating zone centered at the six o'clock position is the circumferential reference reference, and the heating power of the remaining circumferential heating zones is 75%-100% of the circumferential reference reference.

5. The heating control method according to claim 4, characterized in that, Each of the axial heating zones is sequentially divided along the axial direction of the pipe (1) into a fourth axial heating zone (A31), a second axial heating zone (A21), a first axial heating zone (A11), a third axial heating zone (A22), and a fifth axial heating zone (A32). The first axial heating zone (A11) is centrally located, the second axial heating zone (A21) and the third axial heating zone (A22) are symmetrically arranged about the first axial heating zone (A11), and the fourth axial heating zone (A31) and the fifth axial heating zone (A32) are symmetrically arranged about the first axial heating zone (A11). The first axial heating zone (A11) is symmetrically arranged, and each of the axial control zones is a first axial control zone (A1), a second axial control zone (A2), and a third axial control zone (A3). The first axial heating zone (A11) is controlled by the first axial control zone (A1), the second axial heating zone (A21) and the third axial heating zone (A22) are controlled by the second axial control zone (A2), and the fourth axial heating zone (A31) and the fifth axial heating zone (A32) are controlled by the third axial control zone (A3).

6. The heating control method according to claim 5, characterized in that, The heating and shrinking control program includes a first sub-heating and shrinking control program, a second sub-heating and shrinking control program, and a third sub-heating and shrinking control program. The first sub-heating and shrinking control program is used to control the first axial control area (A1), the second sub-heating and shrinking control program is used to control the second axial control area (A2), and the third sub-heating and shrinking control program is used to control the third axial control area (A3).

7. The heating control method according to claim 6, characterized in that, The axial heating zone is divided into the following circumferential heating zones along the 2 o'clock, 3 o'clock, 4:30, 6 o'clock, 7:30, 9 o'clock, 10 o'clock, and 12 o'clock directions: a sixth circumferential heating zone (C41), a fourth circumferential heating zone (C31), a second circumferential heating zone (C21), a first circumferential heating zone (C11), a third circumferential heating zone (C22), a fifth circumferential heating zone (C32), a seventh circumferential heating zone (C51), and an eighth circumferential heating zone (C61). The third circumferential heating zone (C22) and the second circumferential heating zone (C21) are symmetrically arranged with respect to the first circumferential heating zone (C11). The fifth circumferential heating zone (C32) and the fourth circumferential heating zone (C31) are symmetrically arranged with respect to the first circumferential heating zone (C11). The sixth circumferential heating zone (C41) and the seventh circumferential heating zone (C51) are symmetrically arranged with respect to the first circumferential heating zone (C11).

8. The heating control method according to claim 7, characterized in that, The circumferential control area includes a first circumferential control area (C1), a second circumferential control area (C2), a third circumferential control area (C3), a fourth circumferential control area (C4), a fifth circumferential control area (C5), and a sixth circumferential control area (C6). The first circumferential control area (C1) controls the first circumferential heating area (C11), the second circumferential control area (C2) controls the third circumferential heating area (C22) and the second circumferential heating area (C21), the third circumferential control area (C3) controls the fifth circumferential heating area (C32) and the fourth circumferential heating area (C31), the fourth circumferential control area (C4) controls the sixth circumferential heating area (C41), the fifth circumferential control area (C5) controls the seventh circumferential heating area (C51), and the sixth circumferential control area (C6) controls the eighth circumferential heating area (C61).

9. The heating control method according to any one of claims 1 to 8, characterized in that, Each of the circumferential heating zones is provided with a heating element (E) whose radial position is adjustable. The heating elements (E) on two adjacent axial heating zones are arranged in a staggered manner, and the length direction of the heating element (E) is parallel to the length direction of the pipe (1).

10. The heating control method according to any one of claims 1 to 8, characterized in that, Each of the aforementioned circumferential heating zones is also equipped with a temperature detection device (45).

11. The heating control method according to any one of claims 1 to 8, characterized in that, According to the preset tempering control program, each of the axial heating zones is controlled to temper the heat shrinkable strip (3) according to the preset heating power and heating time.

12. A heating system, characterized in that, The heating system is used to implement the heating control method according to any one of claims 1 to 11. The heating system includes a heating controller (5) and a heater (4). The heating controller (5) stores a heating shrinkage control program and a tempering control program. The heater (4) is provided with a plurality of axial heating zones. Each axial heating zone is divided into a plurality of circumferential heating zones along the clock direction. A heating element (E) is arranged in each circumferential heating zone. The heating controller (5) is wirelessly connected to each heating element (E) to control each axial heating zone to heat and shrink the heat shrinkage strip (3) according to a preset heating power and heating time, so that the heat shrinkage strip (3) can shrink quickly and evenly from the center to both sides.

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