CN220500016U - Heater and heating system - Google Patents

Abstract

The utility model relates to an anti-corrosion joint coating device for a pipeline, and discloses a heater and a heating system. The heater can enable the heat shrinkage belt to shrink rapidly and uniformly in the order from the center to the two sides, has no folds and bubbles, and improves the installation quality and efficiency of the anti-corrosion joint of the pipeline heat shrinkage belt.

Description

Heater and heating system

Technical Field

The utility model relates to an anti-corrosion joint coating device for a pipeline, in particular to a heater. Furthermore, a heating system is disclosed.

Background

Most conveying pipelines are formed by sequentially welding a plurality of seamless steel pipes, and welding seams are formed between two adjacent seamless steel pipes. Because the welding seam is the part with the worst anticorrosion effect in the whole pipeline, in order to ensure the smooth operation of pipeline transportation, the welding seam of the pipeline is necessary to be subjected to anticorrosion joint coating operation. The heat-shrinkable tape coating is the most commonly used anti-corrosion joint coating form in the current oil gas transmission pipeline laying process, and the process flow comprises the main flow links of steel pipe sand blasting rust removal, epoxy primer brushing, heat-shrinkable tape installation and the like, wherein the heat-shrinkable tape installation generally comprises two methods: manual flame baking installation and automatic installation of infrared heating equipment. From the engineering practice, both installation modes have very wide application.

Manual flame baking is a method commonly used for the corrosion-resistant joint coating of the domestic pipeline heat shrinkage belt at present. During operation, two or more persons symmetrically stand at two sides of the pipeline, propane gas flames are used for heating the heat shrinkage belt in the circumferential direction in the sequence from the middle to the two sides, so that the heat shrinkage belt gradually and uniformly shrinks and wraps the surface of the steel pipe, and then the tempering treatment is carried out by continuing to heat, so that the hot melt adhesive of the heat shrinkage belt is fully melted and adhered to the pipeline. In the installation process, attention is paid to observing the shrinkage condition of the heat shrinkage belt, and a press roller is used for treating wrinkles or bubbles in time. The manual flame baking installation heat shrinkage belt has the advantages of simple operation procedure, low requirement on the condition of a construction site and the like, but simultaneously has the following defects:

1. flame intensity, flame position used, distance between flame and pipeline, heating sequence, effective heating time of each position, etc. all have important influence on shrinkage of heat shrinkage belt and melting of hot melt adhesive. That is, the operating skill and responsibility consciousness of the operator directly determine the installation quality of the heat-shrinkable belt, and because the parameters are generally controlled completely depending on the experience and visual observation of the operator, the accurate control of the heating temperature is difficult to realize, and the problems of insufficient melting of the hot melt adhesive, scorching and carbonization of the backing material and the like often occur due to uneven heating of the heat-shrinkable belt;

2. when the anti-corrosion joint coating of the large-caliber pipeline is carried out, the anti-corrosion joint coating is limited by factors such as the height and arm expansion of an operator, the heating difficulty of the top and the bottom of the heat-shrinkable belt is high, the labor intensity of the operator is high, the construction efficiency is low, meanwhile, the problems of insufficient and uneven heating exist, and the installation quality of the heat-shrinkable belt can be adversely affected;

3. when working in low-temperature environments such as winter, the problems of insufficient melting of the hot melt adhesive are more outstanding because the flame heating efficiency is lower, the heat dissipation is faster, and the non-uniform heating is easy to occur, so that the installation quality and the working efficiency of the heat shrinkage belt are more difficult to effectively ensure.

Compared with a manual flame baking mode, the infrared heating equipment can better meet the installation requirement of the heat shrinkage belt, can solve the defects of the manual flame baking mode, and is the development direction of the heat shrinkage belt anti-corrosion joint coating construction technology. Compared with a manual flame baking mode, the method has the following advantages:

1. the heating parameters are easy to control, and the installation quality is high. The infrared heating equipment can heat the heat shrinkage belt according to preset parameters and methods, the heat shrinkage belt is heated uniformly and the temperature is controllable, so that the influence of human factors is reduced to the greatest extent, the heat shrinkage belt is ensured to shrink uniformly in sequence, and the hot melt adhesive is fully melted;

2. and the area heating mode is adopted, so that the installation efficiency is high. The densely arranged heating elements cover the whole anti-corrosion joint coating area, can heat the heat shrinkage belt in a large area even in a whole way, and compared with a single-point heat source of flame, the heating efficiency is obviously improved, and the anti-corrosion joint coating effect on a large-caliber pipeline is particularly obvious;

3. the number of operators is reduced, the labor intensity is reduced, and the intrinsic safety is realized. The infrared heating equipment realizes the automatic operation of most installation procedures of the heat shrink belt, the output power of the equipment can be adjusted through the selection of the infrared heating element, and the problem that operators need to increase in order to improve the installation efficiency when the heat shrink belt is installed by manual flame heating is avoided. Meanwhile, propane gas is avoided, and potential safety hazards on site are reduced.

Patent document CN201711217916.2 discloses a joint coating device for a pipeline, the joint coating device has an integral structure of an openable and closable annular bracket, the bracket can rotate around the pipeline, a second heating component is mounted on a frame of a winding mechanism arranged on the bracket, and a plurality of infrared lamp tubes are fixed on an infrared lamp frame of the second heating component. During operation, the second heating component rotates along with the support, heats the adhesive layer of the joint coating area, and is adhered to the surface of the pipeline through the rotary adsorption roller. The above-mentioned mending device can not satisfy the order requirement that the anticorrosive mending mouth of heat shrinkage area gradually transited the heating from the centre to both sides, because the axial temperature difference of pipeline, the axial temperature difference of mending mouth area and the irradiancy inhomogeneous problem that heat shrinkage area itself had necessarily to exist, moreover, when heating installation heat shrinkage area, the factor influences such as heated air flows, the heat shrinkage area has great temperature gradient in the hoop direction, the problem of heating inadequately or overheated appears easily, in the actual installation process, produces fold and bubble parcel easily.

Disclosure of Invention

The utility model aims to provide a heater which can enable a heat shrinkage belt to shrink rapidly and uniformly from the center to two sides, has no wrinkles and bubbles, and improves the installation quality and efficiency of an anti-corrosion joint of a pipeline heat shrinkage belt. It is a second object of the present utility model to provide a heating system.

In order to achieve the above object, according to an aspect of the present utility model, there is provided a heater including a support frame capable of being mounted on a pipe, the support frame including a pair of ring frames and a plurality of ring plates disposed between the pair of ring frames, the ring plates being divided into a plurality of ring heating zones in a clock direction in a ring direction, heating elements having adjustable positions in a radial direction being disposed in each of the ring heating zones, the heating elements on adjacent ring plates being arranged in a staggered manner.

In some embodiments, the annular plate is uniformly provided with a plurality of positioning holes, the heating element is detachably arranged on the annular plate through a porous plate, and the length direction of the heating element is parallel to the length direction of the pipeline.

In some embodiments, the heating element is snapped onto an end of the perforated plate remote from the ring plate.

In some embodiments, a temperature detection device is further disposed in each of the annular heating zones.

In some embodiments, the annular heating zones are divided in the annular direction on the annular plate in two o 'clock directions, six o' clock directions, ten o 'clock directions and twelve o' clock directions, respectively.

In some embodiments, the annular heating zones are divided in the annular direction by two o 'clock, three o' clock, four o 'clock, six o' clock, seven o 'clock, nine o' clock, ten o 'clock and twelve o' clock directions on the annular plate.

In some embodiments, each of the ring frames and each of the ring plates are connected by a connecting rod.

In some embodiments, the annular frame comprises a first frame, a second frame and a third frame, one end of the first frame is hinged with one end of the second frame, the other end of the first frame is hinged with one end of the third frame, and the other end of the second frame is connected with the other end of the third frame through an opening and closing mechanism.

In some embodiments, a plurality of support rods for positioning the pipeline are arranged on the annular frame along the annular direction.

In some embodiments, a positioning mechanism for positioning the pipe is disposed on each of the annular frames.

In another aspect, the present utility model provides a heating system, including a heating controller and a heater according to any one of the foregoing technical solutions, where the heating controller is communicatively connected to each of the heating elements.

Through the technical scheme, the utility model has the following beneficial effects:

the annular heating zones are divided along the annular direction in the clock direction, heating elements are arranged in each annular heating zone, and the heating elements on adjacent annular plates are arranged in a crossed and staggered mode, so that heating is more uniform when the heat shrinkage belt is installed in a heating mode, the heating elements are controlled according to a set program, the sequential requirement that the anti-corrosion joint of the heat shrinkage belt is heated from the middle to the two sides in a gradual transition mode can be met, folds and bubble wrapping cannot be generated, the backing material of the heat shrinkage belt cannot be burnt and carbonized, the hot melt adhesive of the heat shrinkage belt is fully melted and overflows uniformly along the edges, and the installation quality and efficiency of the anti-corrosion joint of the heat shrinkage belt of the pipeline are improved.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the description serve to explain, without limitation, the utility model. In the drawings:

FIG. 1 is a schematic perspective view of a heater according to an embodiment of the present utility model;

FIG. 2 is one of the schematic structural views of the heater according to the embodiment of the present utility model;

FIG. 3 is a second schematic diagram of a heater according to an embodiment of the present utility model;

FIG. 4 is a schematic view of the assembly of a perforated plate and a heating element in accordance with an embodiment of the present utility model;

FIG. 5 is a schematic illustration of the arrangement of the axial control zone, axial heating zone and heating elements in an embodiment of the utility model;

fig. 6 is a schematic diagram of the arrangement of the annular control zone and the annular heating zone in an embodiment of the utility model.

Description of the reference numerals

1 pipeline 2 main body anti-corrosion layer

3 thermal contraction belt 4 heater

41 ring frame

411 first frame 412 second frame

413 third frame 414 rotation axis

415 opening and closing mechanism 416 connecting rod

417 supporting rod 418 hydraulic cylinder

First ring plate of 42 ring plate 421

422 second ring plate 423 third ring plate

424 fourth ring plate 425 fifth ring plate

43 perforated plate 431 positioning block

432 buckle 44 positioning mechanism

45 temperature detecting device 5 heating controller

E first axial control zone of heating element A1

A2 second axial control zone A3 third axial control zone

A11 first axial heating zone A21 second axial heating zone

A22 third axial heating zone A31 fourth axial heating zone

A32 fifth axial heating zone C1 first circumferential control zone

C2 second circumferential control zone C3 third circumferential control zone

C4 fourth circumferential control zone C5 fifth circumferential control zone

C6 sixth annular control zone C11 first annular heating zone

C21 second annular heating zone C22 third annular heating zone

C31 fourth annular heating zone C32 fifth annular heating zone

C41 sixth circumferential heating zone C51 seventh circumferential heating zone

C61 eighth annular heating zone

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured," or "connected" are to be construed broadly, and for example, the terms "connected" may be either fixedly connected, detachably connected, or integrally connected; either directly or indirectly via an intermediate medium, or in communication with each other or in interaction with each other. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," "eighth" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying any particular order of magnitude in which technical features are indicated, and thus, features defining "first," "second," "third," "fourth," "fifth," "sixth," "seventh," "eighth" may explicitly or implicitly include one or more of said features.

In the present utility model, the directional terms used are based on the orientation or positional relationship shown in the drawings and do not indicate or imply that the device or element in question must have a particular orientation, be constructed and operate in a particular orientation and therefore should not be construed as limiting the utility model; the directional terms of the present utility model should be construed in connection with its actual installation state.

As shown in fig. 1 to 6, the present utility model provides a heater 4, which comprises a support frame, wherein the support frame can be sleeved on a pipeline 1, the support frame comprises a pair of annular frames 41 and a plurality of annular plates 42, the annular plates 42 are arranged between the pair of annular frames 41, the annular plates 42 divide a plurality of annular heating areas along the annular direction according to the clock direction, heating elements E with adjustable radial positions are arranged in each annular heating area, and as shown in fig. 5, the heating elements E on adjacent annular plates 42 are arranged in a staggered manner. Therefore, when the heat shrinkage belt is installed by heating, the heat shrinkage belt can be heated more uniformly, the heating element E is controlled according to a set program, the sequence requirement that the anti-corrosion joint coating of the heat shrinkage belt is heated from the middle to the two sides in a gradual transition manner can be met, wrinkles and bubble wrapping can not be generated, the back material of the heat shrinkage belt can not be burnt and carbonized, the hot melt adhesive of the heat shrinkage belt is fully melted and overflows uniformly along the edges, and the installation quality and efficiency of the anti-corrosion joint coating of the pipeline heat shrinkage belt are improved. Specifically, as shown in fig. 1, the heater 4 of the utility model is arranged around the joint of the pipeline 1, and the heating element E is used for baking and heating the heat shrinkage belt 3 according to the control program and heating parameters of the heating controller 5, so that the automatic installation of the heat shrinkage belt 3 is realized, and the heat shrinkage belt 3 is adhered to the joint of the pipeline 1 and is tightly adhered to the main body anti-corrosion layer 2 of the pipeline 1.

The heating element E can be an infrared heating element, and can be a quartz lamp tube, the infrared wavelength range of radiation is 1.1-1.4 mu m, the quartz lamp tube adopts coating treatment, and the reflectivity of the coating to infrared is not lower than 70%. For example, the coating process of the quartz lamp tube is gold plating, a gold reflecting film is formed by coating half surface on the inner surface of the quartz lamp tube, the reflectivity of the gold reflecting film to infrared rays is 90%, or the coating process of the quartz lamp tube can be silver plating. The heating wire of the quartz lamp tube is tungsten wire, and can radiate infrared rays with the wavelength of 1.1-1.4 mu m after being electrified for 1-3 seconds, or the heating wire of the quartz lamp tube can be carbon fiber. In a specific embodiment, the rated heating power of each quartz tube may be 1kW. Of course, the heating element E may be other elements capable of performing a similar heating function. The circumferential direction means, for example, the annular frame 41 has an annular structure as a whole, and the annular plate 42 has an annular structure as a whole, and the circumferential direction means the circumferential direction of the annular structure.

As shown in fig. 3 and 4, a plurality of positioning holes are uniformly arranged on the ring plate 42, the heating element E is mounted on the porous plate 43, a plurality of through holes are correspondingly formed in the porous plate 43, the heating element E is detachably mounted on the ring plate 42 by adopting a pin shaft, a bolt and a screw to pass through the through holes in the porous plate 43 and the positioning holes in the ring plate 42, the position of the heating element E away from a pipeline is adjusted by adjusting the relative positions of the porous plate 43 and the ring plate 42, and the length direction of the heating element E is parallel to the length direction of the pipeline 1, so that the applicability of the pipeline 1 with different pipe diameters can be effectively improved. Multiple perforated plates 43, for example 100, may be mounted on one ring plate 42 to achieve better heating uniformity. Specifically, as shown in fig. 4, a mounting plate is formed at an end of the porous plate 43 remote from the through hole thereon, and a buckle 432 is provided on the mounting plate, the buckle 432 being capable of being engaged with the heating element E, thereby engaging the heating element E on the porous plate 43. The distance between the heating element E and the pipeline 1 can be adjusted by adjusting the relative positions of the porous plate 43 and the annular plate 42, so that the distance between the heating element E and the pipeline 1 can be adjusted to adapt to pipelines 1 with different pipe diameters, the device has good applicability, and is suitable for the installation of at least three pipelines 1 with continuous diameter specifications, such as corrosion-resistant joint coating heat shrink belts for three continuous diameter specifications of steel pipes with phi 457mm, phi 508mm and phi 559 mm.

In some embodiments, the support frame is integrally formed as a collapsible ring structure. Specifically, in the embodiment shown in fig. 2, the ring frame 41 includes a first frame 411, a second frame 412, and a third frame 413, one end of the first frame 411 is hinged to one end of the second frame 412, the other end of the first frame is hinged to one end of the third frame 413, and the other end of the second frame 412 is connected to the other end of the third frame 413 through an opening and closing mechanism 415, for example, the opening and closing mechanism 415 may be a buckle opening and closing mechanism. Correspondingly, the ring plate 42 is also divided into three parts corresponding to the first frame 411, the second frame 412 and the third frame 413 one by one respectively, and the corresponding parts of the first frame 411 and the ring plate 42 are connected through a connecting rod 416, and a positioning block 431 is arranged at the corresponding part of the ring plate 42, and the connecting rod 416 passes through the positioning block 431; similarly, the second frame 412 is connected with the corresponding portion of the ring plate 42 through a connecting rod 416, and the corresponding portion of the ring plate 42 is provided with a positioning block 431, and the connecting rod 416 passes through the positioning block 431; the third frame 413 is connected with the corresponding part of the ring plate 42 through a connecting rod 416, and the corresponding part of the ring plate 42 is provided with a positioning block 431, and the connecting rod 416 passes through the positioning block 431; so that the whole of the support frame is three circular arc structures which are sequentially connected to form an annular structure, the circular arc structure with the first frame 411 and the circular arc structure with the second frame 412 and the third frame 413 are respectively connected through the rotating shaft 414, and the two circular arc structures with the second frame 412 and the third frame 413 are connected through the opening and closing mechanism 415. A hydraulic oil cylinder 418 is arranged between the first frame 411 and the second frame 412 and between the first frame 411 and the third frame 413 respectively, and the second frame 412 and the third frame 413 are driven to open and close by controlling the expansion and contraction of the hydraulic oil cylinder 418, so that the opening of the support frame is controlled, and the heater 4 can be sleeved at a pipeline butt welding seam of a to-be-preserved joint through the crane under the condition that the support frame is opened.

Further, a plurality of support bars 417 are arranged on the ring frame 41, and each support bar 417 is arranged in the circumferential direction for positioning the pipe 1. Specifically, as shown in fig. 1 and 2, after the heater 4 is sleeved at the butt weld of the pipe to be repaired, the supporting frame is controlled to be closed, and then the supporting rod 417 is controlled to extend, so that the end of the supporting rod 417 is pressed against the pipe 1, the heater 4 is clamped on the pipe 1, and the annular frame 41 is concentric with the pipe 1. The support rod 417 may be a hydraulic cylinder, an electric cylinder, or the like.

As shown in fig. 2, positioning mechanisms 44 are disposed on the respective ring frames 41, the positioning mechanisms 44 are used for positioning the pipes 1, the positioning mechanisms 44 may be laser width indicators, specifically may be lasers, and in the process of sleeving the heater 4 on the pipes 1, the positioning mechanisms 44 emit laser light to irradiate the pipes 1, and the mounting positions of the heater 4 are adjusted according to deviation from marks on the pipes 1.

The heater 4 of the present utility model skillfully designs the layout of the heating elements E, specifically, as shown in fig. 3, the number of the ring plates 42 is five, and is divided into a first ring plate 421, a second ring plate 422, a third ring plate 423, a fourth ring plate 424 and a fifth ring plate 425, as shown in fig. 5, so that five axial heating zones are formed along the axial direction, and are 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, and the heating elements E in adjacent axial heating zones form a cross dislocation arrangement as shown in fig. 5, that is, the heating elements E on the adjacent ring plates 42 are cross dislocation arrangement. In terms of control strategies, the first axial heating zone a11 is located in the middle, the second axial heating zone a21 and the third axial heating zone a22 are located on two sides of the first axial heating zone a11 respectively, the fourth axial heating zone a31 is located on the outer side of the second axial heating zone a21, the fifth axial heating zone a32 is located on the outer side of the third axial heating zone a22, and three control zones, namely a first axial control zone A1, a second axial control zone A2, a third axial control zone A3, are arranged, the first axial heating zone a11 is attributed to the first axial control zone A1, the second axial heating zone a21 and the third axial heating zone a22 are attributed to the second axial control zone A2, the fourth axial heating zone a31 and the fifth axial heating zone a32 are attributed to the third axial control zone A3, so that the first axial heating zone a11, the second axial heating zone a21, the third axial heating zone a22, the fourth axial heating zone a31 and the fifth axial heating zone a32 are respectively controlled in three parts, and the control strategies of the heating elements E in the same axial control zones are the same. Further, for each annular plate 42, a number of annular heating zones which are continuous in the annular direction are divided in the annular direction in each annular plate 42, the number of annular heating zones is not less than six, and annular heating zones centered on two points, six points, ten points and twelve points must be included. In the embodiment shown in fig. 6, the annular plate 42 is divided into two-o 'clock, three-o' clock, four-o 'clock, six-o' clock, seven-o 'clock, nine-o' clock, ten-o 'clock and twelve-o' clock annular heating zones respectively, specifically, into a first annular heating zone C11, a second annular heating zone C21, a third annular heating zone C22, a fourth annular heating zone C31, a fifth annular heating zone C32, a sixth annular heating zone C41, a seventh annular heating zone C51, an eighth annular heating zone C61, the first annular heating zone C11 being located in the six-o 'clock direction, the second annular heating zone C21 being located in the four-o' clock direction, the third annular heating zone C22 being located in the seven-o 'clock direction, the fourth annular heating zone C31 is located at the three o' clock direction, the fifth annular heating zone C32 is located at the nine o 'clock direction, the sixth annular heating zone C41 is located at the two o' clock direction, the seventh annular heating zone C51 is located at the ten o 'clock direction, the eighth annular heating zone C61 is located at the twelve o' clock direction, the first annular heating zone C11, the second annular heating zone C21, the third annular heating zone C22, the fourth annular heating zone C31, the fifth annular heating zone C32, the sixth annular heating zone C41, the seventh annular heating zone C51 and the eighth annular heating zone C61 are respectively provided with heating elements E, and the space occupied by each annular heating zone is not completely the same, and is designed according to the temperature gradient of the annular direction of the heat shrinkage zone during heating. Similarly, six control zones such as 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, a sixth annular control zone C6 and the like are also provided, the first annular heating zone C11, the second annular heating zone C21, the third annular heating zone C22, the fourth annular heating zone C31, the fifth annular heating zone C32, the sixth annular heating zone C41, the seventh annular heating zone C51, the eighth annular heating zone C61 belong to different annular control zones, specifically, the first annular heating zone C11 belongs to the first annular control zone C1, the second annular heating zone C21 belongs to the second annular control zone C2 with the third annular heating zone C22, the fourth annular heating zone C31 belongs to the third annular control zone C3 with the fifth annular heating zone C32, the sixth annular heating zone C41 belongs to the fourth annular control zone C4, the seventh annular heating zone C61 belongs to the same annular control zone C6, and the eighth annular heating zone C61 belongs to the same annular control zone C.

As shown in fig. 3, a temperature detecting device 45 for monitoring heating condition can be arranged at each annular heating zone; alternatively, a temperature detection device 45 for monitoring the heating condition may be arranged in each circumferential control zone; the temperature detection device 45 may be specifically a temperature sensor.

In order to better understand the technical idea of the present utility model, the following description is made in connection with relatively comprehensive technical features.

As shown in fig. 1 to 6, a preferred embodiment of the present utility model provides a heater 4 comprising a support frame capable of being fitted over a pipe 1, the support frame comprising a pair of ring frames 41 and at least five ring plates 42, each ring plate 42 being disposed between the pair of ring frames 41, a plurality of positioning holes being uniformly disposed on the ring plates 42, a heating element E being mounted on a porous plate 43, the porous plate 43 being correspondingly provided with a plurality of through holes, the heating element E being detachably mounted on the ring plates 42, the position of the heating element E from the pipe being adjusted by adjusting the relative positions of the porous plate 43 and the ring plates 42, and the length direction of the heating element E being parallel to the length direction of the pipe 1. The ring frame 41 includes a first frame 411, a second frame 412, and a third frame 413, where one end of the first frame 411 is hinged to one end of the second frame 412, and the other end of the first frame is hinged to one end of the third frame 413, and the other end of the second frame 412 is connected to the other end of the third frame 413 through an opening and closing mechanism 415, for example, the opening and closing mechanism 415 may be a buckle opening and closing mechanism. The ring plate 42 is also divided into three parts corresponding to the first frame 411, the second frame 412 and the third frame 413 one by one respectively, and the corresponding parts of the first frame 411 and the ring plate 42 are connected through a connecting rod 416, and a positioning block 431 is arranged at the corresponding part of the ring plate 42, and the connecting rod 416 passes through the positioning block 431; similarly, the second frame 412 is connected with the corresponding portion of the ring plate 42 through a connecting rod 416, and the corresponding portion of the ring plate 42 is provided with a positioning block 431, and the connecting rod 416 passes through the positioning block 431; the third frame 413 is connected with the corresponding part of the ring plate 42 through a connecting rod 416, and the corresponding part of the ring plate 42 is provided with a positioning block 431, and the connecting rod 416 passes through the positioning block 431; so that the whole of the support frame is three circular arc structures which are sequentially connected to form an annular structure, the circular arc structure with the first frame 411 and the circular arc structure with the second frame 412 and the third frame 413 are respectively connected through the rotating shaft 414, and the two circular arc structures with the second frame 412 and the third frame 413 are connected through the opening and closing mechanism 415. Hydraulic cylinders 418 are respectively arranged between the first frame 411 and the second frame 412 and between the first frame 411 and the third frame 413, and the second frame 412 and the third frame 413 are driven to open and close by controlling the expansion and contraction of the hydraulic cylinders 418, so that the opening of the support frame is controlled. A plurality of support bars 417 are arranged on the ring frame 41, each support bar 417 being arranged in a circumferential direction for positioning the pipe 1. On each ring frame 41, a positioning mechanism 44 is arranged, the positioning mechanism 44 is used for positioning the pipeline 1, and the positioning mechanism 44 may be a laser width indicator, in particular a laser. The number of the ring plates 42 is five, and the ring plates are divided into a first ring plate 421, a second ring plate 421, a third ring plate 421, a fourth ring plate 421 and a fifth ring plate 421, and are 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, and the heating elements E in adjacent axial heating zones form a crossed staggered arrangement mode as shown in FIG. 5. For each annular plate 42, a plurality of continuous annular heating areas are divided into a first annular heating area C11, a second annular heating area C21, a third annular heating area C22, a fourth annular heating area C31, a fifth annular heating area C32, a sixth annular heating area C41, a seventh annular heating area C51, an eighth annular heating area C61, wherein the first annular heating area C11 is located in the six-o-clock direction, the second annular heating area C21 is located in the four-o-half-clock direction, the third annular heating area C22 is located in the seven-o-half-clock direction, the fourth annular heating area C31 is located in the three-o-clock direction, the fifth annular heating area C32 is located in the nine-o-clock direction, the sixth annular heating area C41 is located in the two-o-clock direction, the seventh annular heating area C51 is located in the ten-o-clock direction, the eighth annular heating area C61 is located in the twelve-o-clock direction, and heating elements E are respectively arranged in each annular heating area.

Typically, a heating controller 5 is provided in communication with each heating element E to form a heating system. The heating process of the heat shrinkage belt is controlled by controlling each heating element E, and specifically, the heating power of the heating elements E is controlled and regulated by a power regulating module.

During the heating of the heat-shrinkable band, the heater 4 heats according to the heating control principle provided by the heating controller 5 and the set heating parameters.

The heating controller 5 adopts sectional control of not less than three sections for each axial control region, the heating power and the heating time of the heating element in each stage can be set respectively, the heating of each axial control region is started and stopped simultaneously, and the total heating time is the same. Specifically, the heating control principle provided by the heating controller 5 adopts a control mode of high power, medium power and low power for the heating power of the heating element E in the first axial control area A1, a control mode of low power, medium power and high power for the heating power of the heating element E in the third axial control area A3, and a control mode of medium/low power, high power, low/medium power for the heating power of the heating element E in the second axial control area A2; the heating power of the heating element E in the initial stage of each axial control zone is gradually decreased from the center to the two sides, the stage in the high power stage is gradually and backwardly extended, and the heating power of the final stage is gradually increased; the heating control principle is defined as high power, medium power and low power: the heating power of the heating element E in the first circumferential heating zone C11 centered at six o' clock reaches 60% -100%, 20-80% and 0-40% of its rated power, respectively.

The heating controller 5 may set heating parameters for the heating elements E of each control zone separately, the total output energy of the heating elements E of each axial heating zone following the energy scaling principle, the heating power of the heating elements E of each circumferential control zone following the power scaling principle.

The energy proportion principle is that the total output energy of the first axial heating zone A11 is taken as a reference standard, the total output energy of the other axial heating zones is 100% -150% of the reference standard, and the total output energy of each axial heating zone is sequentially increased from the center to the two sides; in the embodiment of fig. 5, the total output energy of the second axial heating zone a21 or the third axial heating zone a22 is 100% -120% of the first axial heating zone a11, and the total output energy of the fourth axial heating zone a31 or the fifth axial heating zone a32 is 110% -150% of the first axial heating zone a11, based on the total output energy of the first axial heating zone a 11.

The power proportion principle is that the output power of the heating element E of the first annular heating zone C11 taking six points as the center is taken as a reference standard, the output power of the infrared heating elements of the other annular control zones of the axial control zone where the output power is positioned is 75% -100% of the reference standard, and the heating power of the heating element E is lower when the position of the annular control zone is higher. In the embodiment of fig. 6, the heating power of the heating elements E of the second, third, fourth, fifth and sixth circumferential control zones C2, C3, C4, C5 and C6 is 85% -100%, 80% -95% and 75% -90% of the heating power of the heating elements E of the first circumferential control zone C1 of the axial control zone, based on the power of the heating elements E of the first circumferential control zone C1.

The temperature of each heating zone can be monitored in real time by the heating controller 5 through the temperature detection device 45; the heating controller 5 uses the heating temperature as feedback data of the heating effect, assists the output energy data of the heating element E of each control region, and can perform heating parameter correction. The heating zone is short for each axial heating zone and each circumferential heating zone, and the control zone is short for each axial control zone and each circumferential control zone.

As an example of the heating control principle provided by the heating controller 5 and the set heating parameters, the control program and the heating parameters of the heating controller 5 may be set with reference to the following: the heating power of the heating element E of the axial control zone is controlled by three sections, and the heating time is set to 90s. The heating power of the heating element E of each annular control zone is set based on the heating power of the heating element E of the first annular heating zone C11 of the axial control zone where the heating element E is positioned, and for three heating stages of the first axial control zone A1, the heating power of the heating element E is sequentially set to 80%, 50% and 10% of the rated power, and the corresponding heating time is respectively 50%, 37.5% and 12.5% of the total running time of the control program; for the three heating phases of the second axial control zone A2, the heating power of the heating element E is set to 50%, 80% and 10% of its rated power in sequence, the corresponding heating times being 18.75%, 68.75% and 12.5% of the total running time of the control program, respectively; for the three heating phases of the third axial control zone A3, the heating power of the heating element E is set to 20%, 60% and 90% of its rated power in sequence, the corresponding heating times being respectively 12.5%, 31.25% and 56.25% of the total running time of the control program; the heating power of the heating elements E of the second, third, fourth, fifth, sixth circumferential control zones C2, C3, C4, C5, C6 may be set at 98%, 95%, 92%, 90% and 88% of the heating power of the infrared heating elements E of the first circumferential control zone C1 of the axial control zone in which they are located.

The temperature sensor 45 can monitor the heating temperature of the thermal contraction band 3 of the anti-corrosion joint coating in real time, and based on the control program and the heating parameters of the heating controller 5, the temperature monitoring data of the heating controller 5 shows that the extreme difference of the highest temperature of each heated area of the thermal contraction band can be less than 10 ℃, and the peeling strength deviation of the thermal contraction band in each heated area can not exceed 15%.

The heater 4 can be clamped on at least three pipelines with continuous diameter specifications, and the heating sequence, the heating temperature and the heat accumulation of each part of the anti-corrosion joint coating heat shrinkage belt of the oil gas pipeline are precisely controlled according to a control program and heating parameters preset by the heating controller 5, so that the heat shrinkage belt uniformly shrinks according to the sequence from the center to the two sides and the hot melt adhesive of the heat shrinkage belt is fully melted; the heat-shrinkable tape coating after the installation is free of wrinkles and bubbles, the heat-shrinkable tape backing material is free of scorching and carbonization, and the heat-shrinkable tape hot melt adhesive uniformly overflows along the edge of the coating.

Under the control of the heating controller, the heater 4 and the heating system can automatically finish the baking and the installation of the steel pipeline corrosion-resistant joint coating heat shrinkage belts of oil gas pipelines, central heating pipelines, urban water pipelines and the like.

The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited thereto. Within the scope of the technical idea of the utility model, a number of simple variants of the technical solution of the utility model are possible, including combinations of individual specific technical features in any suitable way. The various possible combinations of the utility model are not described in detail in order to avoid unnecessary repetition. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.

Claims (11)

1. The heater is characterized by comprising a support frame which can be sleeved on a pipeline (1), wherein the support frame comprises a pair of annular frames (41) and a plurality of annular plates (42) which are arranged between the pair of annular frames (41), a plurality of annular heating areas are divided in the annular direction according to the clock direction on the annular plates (42), heating elements (E) with adjustable radial positions are arranged in each annular heating area, and the heating elements (E) on the adjacent annular plates (42) are arranged in a staggered manner.

2. The heater according to claim 1, wherein a plurality of positioning holes are uniformly arranged on the annular plate (42), the heating element (E) is detachably mounted on the annular plate (42) through a porous plate (43), and the length direction of the heating element (E) is parallel to the length direction of the pipe (1).

3. A heater according to claim 2, characterized in that the heating element (E) is clamped at the end of the perforated plate (43) remote from the ring plate (42).

4. A heater according to claim 1, wherein a temperature sensing means (45) is also provided in each of the annular heating zones.

5. The heater of any of claims 1 to 4, wherein the annular heating zone is divided in two o 'clock, six o' clock, ten o 'clock and twelve o' clock directions on the annular plate (42).

6. The heater of any of claims 1 to 4, wherein the annular heating zones are divided in the annular direction on the annular plate (42) by two o 'clock, three o' clock, four o 'clock and half o' clock, six o 'clock, seven o' clock and half o 'clock, nine o' clock, ten o 'clock and twelve o' clock directions, respectively.

7. The heater according to any one of claims 1 to 4, wherein each of the annular frames (41) and each of the annular plates (42) are connected by a connecting rod (416).

8. The heater according to claim 7, wherein the ring frame (41) comprises a first frame (411), a second frame (412) and a third frame (413), one end of the first frame (411) is hinged to one end of the second frame (412), the other end of the first frame is hinged to one end of the third frame (413), and the other end of the second frame (412) is connected to the other end of the third frame (413) through an opening and closing mechanism (415).

9. The heater according to any one of claims 1 to 4, characterized in that a number of support bars (417) for positioning the pipe (1) are arranged in the circumferential direction on the ring frame (41).

10. A heater according to any one of claims 1 to 4, wherein a positioning mechanism (44) for positioning the pipe (1) is arranged on each of the annular frames (41).

11. A heating system comprising a heating controller (5) and a heater (4) according to any one of claims 1 to 10, said heating controller (5) being in communication with each of said heating elements (E).