CN110157885B - Crawler-type heater - Google Patents

Crawler-type heater Download PDF

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Publication number
CN110157885B
CN110157885B CN201910538091.7A CN201910538091A CN110157885B CN 110157885 B CN110157885 B CN 110157885B CN 201910538091 A CN201910538091 A CN 201910538091A CN 110157885 B CN110157885 B CN 110157885B
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China
Prior art keywords
heater
mounting
thermocouple
mounting block
heating
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CN201910538091.7A
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Chinese (zh)
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CN110157885A (en
Inventor
赵世斌
刘鸿国
严宝琴
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Shenhua Fuzhou luoyuan Bay Port&power Co ltd
Fujian Jinjiang Cogeneration Co ltd
Shenhua Fujian Energy Co Ltd
Original Assignee
Shenhua Fuzhou luoyuan Bay Port&power Co ltd
Fujian Jinjiang Cogeneration Co ltd
Shenhua Fujian Energy Co Ltd
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Application filed by Shenhua Fuzhou luoyuan Bay Port&power Co ltd, Fujian Jinjiang Cogeneration Co ltd, Shenhua Fujian Energy Co Ltd filed Critical Shenhua Fuzhou luoyuan Bay Port&power Co ltd
Priority to CN201910538091.7A priority Critical patent/CN110157885B/en
Publication of CN110157885A publication Critical patent/CN110157885A/en
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34Methods of heating
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/14Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00Ohmic-resistance heating
    • H05B3/40Heating elements having the shape of rods or tubes
    • H05B3/42Heating elements having the shape of rods or tubes non-flexible
    • H05B3/44Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Resistance Heating (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

The invention discloses a crawler-type heater, which comprises a plurality of heating blocks connected with each other, and also comprises at least one mounting block, wherein the at least one mounting block is configured to replace a corresponding number of the heating blocks in the plurality of heating blocks and has the same interconnection structure with the heating blocks in the crawler-type heater so as to be connected with the heating blocks; the mounting block is configured to mount a temperature measuring device to measure a temperature of a workpiece heated by the tracked heater. The crawler heater provided by the invention is provided with the mounting blocks, so that the temperature measuring device can be conveniently fixed, and a more accurate measuring result can be obtained when the temperature measuring device is used for measuring a workpiece heated by the crawler heater.

Description

Crawler-type heater
Technical Field
Embodiments of the present invention relate to heating devices, and more particularly to a track heater.
Background
The crawler heater is a common flexible heater, can be attached to a workpiece for heating, is generally formed by connecting heating wires in series with ceramic heating plates, is provided with a quick plug and the like, and is commonly used for pre-welding preheating or post-welding heat treatment (collectively called as welding heat treatment) of industrial pipeline field welding joints in the industries of electric power, chemical industry and the like.
The heat treatment of the on-site pipeline generally needs a heater, a thermocouple, heat insulation cotton, a heat insulation blanket, binding iron wires and the like. The heater is used for heating the pipeline; the thermocouple is used for measuring the temperature of the pipeline; heat insulating blankets, heat insulating cotton, etc. are used to coat the heater, tubing, to maintain temperature; the heat-insulating iron wire or iron binding belt is used for fixing a heater, a thermocouple, heat-insulating cotton and the like.
The prior pipeline heat treatment mode is generally as follows: thermocouples are arranged on the pipeline according to the positions specified by the technical regulations, such as the positions of a welding line, a heat affected zone, a base metal and the like in the axial direction, and the positions of the thermocouples are arranged at 12 o ' clock, 3 o ' clock, 9 o ' clock and the like in the circumferential direction, so that the thermocouples are used for temperature measurement and signal feedback for temperature control of a heater. The commonly used thermocouples include K-type armoured thermocouples and simple wire type thermocouples. The K-shaped armoured thermocouple is fixed on the pipeline in a mode of binding iron wires and the like, and the simple wire-shaped thermocouple welds cathodes and anodes of two wire shapes on the pipeline by adopting an energy storage type welding instrument. After the thermocouple is installed on the surface of the pipeline, the crawler heater is covered on the surfaces of the thermocouple and the pipeline, then the heater is fixed by iron wires, and the heat insulation blanket, the heat insulation cotton and the like are covered outside the heater. 4 layers of structures are arranged on the section of the pipeline: pipeline, thermocouple and lead-out wire, heater and heat preservation cotton (or heat insulation blanket).
The arrangement of the crawler heater, thermocouple, etc. has the following problems: the thermocouple is bound by iron wires or welded and fixed, and the site operation is time-consuming and labor-consuming; the thermocouple and the outgoing line are arranged inside the heater, and the thermocouple and the outgoing line are easy to slip and fall off due to the influence of gravity of the heater after being coated outside the heater, so that the measurement result is inaccurate; the iron wires for binding the thermocouples are easy to be heated and expanded, so that the measuring end parts of the thermocouples are in poor contact with the surface of the pipeline, and inaccurate measuring results can be caused; in addition, the operator cannot visually recognize the dislocation of the thermocouple from the outside and take corrective action in time; in addition, according to the arrangement mode of the existing heater and thermocouple, the thermocouple and the heater are generally not isolated by adopting a heat insulation blanket or heat preservation cotton, so that the influence on the heating of the heater on the pipeline is avoided, the local non-uniformity of a heat treatment temperature field is caused, the pipeline safety is influenced, but on the other hand, the thermocouple and the heater are not isolated, so that the thermocouple measurement result is influenced by the heat of the heater and is inaccurate. In addition, the existing heater and thermocouple arrangement cannot be used for pipeline temperature measurement by using a screw type thermocouple.
Disclosure of Invention
The invention aims to provide a crawler-type heater integrated with a temperature acquisition device, which solves the problems of inconvenient installation, difficult fixation and inaccurate measurement of a thermocouple in the prior art.
The crawler-type heater comprises a plurality of heating blocks which are connected with each other, and is characterized by further comprising at least one mounting block which is configured to replace a corresponding number of the heating blocks in the plurality of heating blocks and has the same interconnection structure with the heating blocks in the crawler-type heater so as to be connected with the heating blocks; the mounting block is configured to mount a temperature measuring device to measure a temperature of a workpiece heated by the tracked heater.
According to an exemplary embodiment, in the above crawler heater, a mounting hole for mounting the screw type thermocouple is formed in the mounting block.
According to one exemplary embodiment, the mounting hole includes a large diameter portion configured for insertion of a screw-type thermocouple and a small diameter portion configured for mounting a nut threadedly coupled with the screw-type thermocouple.
According to an exemplary embodiment, an insulation means is provided in the mounting hole to thermally insulate the screw type thermocouple and the nut from the mounting block.
According to an exemplary embodiment, after the screw type thermocouple is mounted in the mounting block, an end portion thereof protrudes out of the mounting hole.
According to an exemplary embodiment, the mounting block is made of a thermally conductive material and has mounting holes formed therein for mounting an armoured thermocouple, such as a K-armoured thermocouple; the armored thermocouple is in heat conduction connection with the mounting block.
According to an exemplary embodiment, the mounting holes include a first mounting hole and a second mounting hole that communicate with each other; the first mounting hole is parallel to the surface of the mounting block, which is to be contacted with the workpiece, and is used for inserting an armored thermocouple; and the second mounting hole is perpendicular to the first mounting hole and is used for mounting a fixing screw.
According to an exemplary embodiment, the mounting block further comprises a heater through hole for penetrating a heating wire; and a heat insulation device is arranged on the inner wall of the hot wire through hole so as to thermally insulate the heating wire from the mounting block.
According to an exemplary embodiment, the thermal insulation means is an insulating sleeve.
According to an exemplary embodiment, the surface of the mounting block that is to be in contact with the workpiece protrudes from a corresponding surface of the heating block of the track heater.
The crawler-type heater provided by the invention is provided with the mounting blocks, overcomes various defects of the conventional binding fixing or welding type fixing thermocouples, can conveniently fix the temperature measuring device, and is time-saving and labor-saving; and the temperature measuring device can be kept fixed, so that the measuring result of the temperature measuring device is more accurate.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the following brief description will be given to the accompanying drawings of the embodiments, and it is obvious that the accompanying drawings in the following description are only for the purpose of illustrating the concept of the present invention, not for limiting the invention.
In the accompanying drawings, a schematic structural diagram according to an embodiment of the present invention is shown. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various components shown in the figures, as well as the relative sizes between them, are merely exemplary, and those skilled in the art may additionally devise components having different shapes and sizes as actually required.
FIG. 1 is a schematic view of a track heater according to one embodiment of the invention;
FIG. 2 is a schematic structural view of an arrangement of a crawler heater according to one embodiment of the present invention when applied to a heating tunnel;
FIG. 3 is a schematic cross-sectional view of the arrangement of the tracked heater of FIG. 2;
FIG. 4a is a schematic plan view of a mounting block in a track heater according to one embodiment of the invention;
FIG. 4b is a schematic cross-sectional structural view of the mounting block of FIG. 4 a;
FIG. 4c is a schematic structural view of a state in which the mounting block of FIG. 4a is used to mount a screw type thermocouple;
FIG. 5a is a schematic perspective view of a mounting block in a track heater according to one embodiment of the invention; and
fig. 5b is a schematic plan view of the mounting block of fig. 5 a.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. In addition, in the following description, descriptions of some well-known structures and techniques are omitted.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to denote relative positional relationships, which may also change accordingly when the absolute position of the object to be described changes.
Some exemplary embodiments of the crawler heater of the present invention are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic view of a crawler heater according to an embodiment of the present invention. As shown in fig. 1, a track heater 100 according to an exemplary embodiment of the present invention includes a plurality of heating blocks 10 connected to each other. In particular, unlike the existing track-type heater, the track-type heater 100 of this embodiment of the present invention further includes at least one mounting block 20, which replaces a corresponding number of the heating blocks 10 in the track-type heater 100, and has the same interconnection structure as the heating blocks 10 in the track-type heater 100, so that the mounting blocks 20 can be interconnected with surrounding heating blocks 10 as one heating block, forming an integral track-type heater. The mounting block 20 is configured to mount a temperature measuring device to measure the temperature of a workpiece, such as a pipe, being heated by the tracked heater 100.
In an embodiment of the present invention, the track-type heater 100 may be constructed in various conventional track-type heater structures, in addition to the mounting blocks 20 connected in series in the heating block 10. For example, the tracked heater 100 includes the power connection cord 30 as a conventional tracked heater; each heating block 10 in the track heater 100 may be a conventional ceramic heating block; the interconnect structure of each heater block may comprise a male-female mating structure, i.e. one heater block comprises a male plug and the other heater block comprises a female plug slot, so that the individual heater blocks may be plugged into each other. In addition, each heating block may include heating wire through holes communicating with each other. The electric heating wire through holes can also be used as interconnection structures of the heating blocks, and the heating blocks are connected into a whole when the electric heating wires are penetrated.
In general, the structure of the mounting block 20 should be substantially the same as that of the heating block 10 replaced by it. For example, the mounting block 20 may include a protruding plug for insertion into a plug slot of the heating block 10 with which it interfaces. In addition, as with the heating block 10, a through hole communicating with the heating wire through hole of the heating block 10 may be included in the mounting block 20 to penetrate the heating wire. Thus, each mounting block 20 may be strung into a heating block of the entire track heater 100 as one heating block 10. The mounting block 20 may be the same or different in material from the heating block 10. The number and location of the mounting blocks 20 may be selected based on the actual measured workpiece requirements. The track heater 100 may be manufactured while commissioned to be completed by the heat treatment heater manufacturer.
The structure of the mounting block 20 is different from that of the heating block 10 in that another structure for mounting a temperature measuring device is also formed in the mounting block 20. For example, the mounting structure is a suitable mounting hole formed in the mounting block 20 for mounting the thermocouple. Thus, when the crawler-type heater 100 of the embodiment of the present invention is used to heat a workpiece such as a pipe, it is not necessary to separately arrange a temperature measuring device on the pipe, simplifying the process flow and saving man-hours. In addition, the basic structure of the track-type heater 100 of the present invention is consistent with that of a conventional track-type heater, and can be used as a direct replacement for a conventional track-type heater without imposing an additional burden on the operator.
Fig. 2 is a schematic structural view of an arrangement in which the crawler-type heater 100 is added to the heating pipe 40 according to an embodiment of the present invention. Fig. 3 is a schematic cross-sectional view of an arrangement of the track heater 100 of fig. 2. As shown in fig. 2 to 3, the track type heater 100 is coated on the pipe 40 for heating the pipe 40, and a heat insulation layer 60 such as a heat blanket and heat insulation cotton is provided at the outside of the track type heater 100. The crawler-type heater 100 includes a plurality of mounting blocks 20 therein, and each mounting block 20 is connected with a temperature measuring device 50 for measuring the temperature of the pipe 40. The temperature measuring device 50 may be, for example, a suitable thermocouple such as a K-armoured thermocouple or a screw thermocouple.
When the crawler-type heater 100 is used for heating a pipeline, the pipeline can be correspondingly heated only by installing the temperature measuring device 50 on the installation block 20, then coating the crawler-type heater 100 on the pipeline, and coating the heat insulation layer 60 such as heat insulation cotton and the like outside the crawler-type heater 100 as a heat insulation device. The temperature change of the pipeline can be monitored simultaneously in the heating process so as to adjust the heating temperature timely.
Specifically, the operation of the track heater 100 of the present invention for heating a pipe is as follows:
first, a temperature acquisition device is mounted on a mounting block of the crawler heater.
Then, the crawler-type heater integrated with the temperature acquisition device is coated on the surface of the pipeline. The width of the pipe to be heat treated is checked against the heater width and aligned. Checking whether the position of the installation block on the heater is consistent with the position of the temperature to be measured of the pipeline.
And then, fixing the heater by adopting an iron wire (or a steel belt), and binding a plurality of channels according to the firmness and effect. The general iron wire ligature is in the head and the tail of heater width direction, centre and has the position of installation piece.
Then, the heater power supply connection wire and the thermocouple outgoing wire are led out to the side along the axis direction of the pipeline and fixed by iron wires.
Finally, the thermocouple and the temperature acquisition device are covered by a heat insulation blanket, and are bundled by iron wires. The thickness and the width of the heat-insulating cotton are required to meet the requirements of regulations. Thereafter, heating and temperature measurements can be performed.
The above sequence of operations is not fixed and can be adjusted as desired. For example, mounting the temperature acquisition device on the mounting block of the tracked heater may be performed after mounting the heater to the pipe.
By adopting the crawler-type heater, the thermocouple is directly arranged in the heater, so that the step of binding iron wires or welding and fixing the thermocouple is omitted, and the thermocouple is convenient to install; the thermocouple is arranged in the heater, so that the problems of sliding and falling of the thermocouple caused by the gravity of the heater when the heater slides and poor contact between the measuring end part of the thermocouple and the surface of the pipeline caused by thermal expansion of an iron wire binding the thermocouple are avoided; in addition, the thermocouple is fixed in position and can be externally seen; a thermal insulation means may be provided between the thermocouple and the heater without affecting the heating of the channel by the heater. Therefore, the crawler-type heater provided by the invention avoids a plurality of defects in the prior art, and can enable the thermocouple to obtain an accurate temperature measurement result.
The structure of the mounting block of the present invention will be specifically described below by way of examples.
Fig. 4a shows a schematic plan view of a mounting block 20a that may be used in the track-type heater 100 of fig. 1, according to an example embodiment of the invention. Fig. 4b is a schematic cross-sectional structural view of the mounting block 20 a. Fig. 4c is a structural view showing a state in which the mounting block 20a is used to mount the screw type thermocouple.
As shown in fig. 4a to 4c, a mounting hole 21 is formed in the mounting block 20a for mounting the screw type thermocouple 50a. The mounting hole 21 is bored through the mounting block 20a perpendicularly to the surface of the mounting block 20a that contacts the workpiece (i.e., the spreading surface of the track heater). It is preferable that the mounting hole 21 is located at a central position of the surface of the mounting block 20a, and the mounting hole 21 includes a small diameter portion 21a for inserting the screw type thermocouple 50a and a large diameter portion 21b for mounting a nut (not shown) which is screw-coupled with the screw type thermocouple 50a to fix the screw type thermocouple 50a. The small diameter portion 21a of the mounting hole 21 may have a circular shape, and the large diameter portion 21b may have a hexagonal shape. The present invention does not limit the shape of the mounting hole as long as the screw type thermocouple 50a can be properly mounted.
One end of the mounting block 20a includes a male plug 22 and the other end includes a female plug slot 23 at a corresponding location. The mounting block 20 also includes a through hole 24 therein for passing a heating wire. The through holes 24 extend parallel to the workpiece-contacting surface of the heating block 20a, and the positions of the through holes 24 should be offset from the mounting holes 21. The through hole 24 may be provided in the mounting block 20a at the positions of the plug 22 and the plug groove 23, communicate with the plug groove 23, and pass through the plug 22. Fig. 4a shows two through holes 24 at both side ends of the mounting block 20 a. The heating block 10 connected to the mounting block 20a may have the same structure as the mounting block 20a except that there are no mounting holes, thereby facilitating the series connection of the mounting block 20a into the heating block 10 to form an integrated track-type heater.
In this embodiment, the mounting block 20a may be of the same ceramic material as the heating block 10 in the track heater 100. In this case, in order to obtain more accurate measurement results, an insulating means 25, such as insulating cotton, may be optionally provided in the mounting hole 21 for thermally insulating the screw-type thermocouple 50a and the nut from the mounting block 20 a. In this way, the measurement result of the thermocouple is not affected by the heat of the mounting block and the surrounding heating blocks, so that the measurement result is more accurate.
According to some embodiments, it is preferable that the mounting hole 21 is sized such that its measuring end protrudes outside the mounting hole 21 after the screw type thermocouple 50a is mounted in the mounting block 20. In this way, when the crawler heater 100 is coated outside the pipe, the measuring end of the screw type thermocouple 50a can more reliably contact the pipe, thereby easily obtaining accurate measurement results. Further, the surface of the mounting block 20 contacting the pipe may be provided as a concave surface so as to closely contact the pipe, making it easier to obtain the measurement result by the screw type thermocouple 50a.
When the crawler-type heater 100 with the mounting block 20a of the present embodiment is used for heating a pipe, the operation is as follows:
first, a screw-type thermocouple is inserted into the central circular hole of the mounting block and secured with a nut, and the screw-type thermocouple tip is typically slightly raised 1-2mm above the heater surface so that the thermocouple end is in closer contact with the pipe surface.
Then, the surface of the pipe to be heat-treated is covered with the surface of the crawler heater facing the pipe to be heat-treated with the thermocouple tip. The width of the pipe to be heated by heat treatment is checked against the width of the heater and aligned. Checking whether the position of the installation block on the heater is consistent with the temperature to be measured of the pipeline.
Then, an iron wire (or a steel belt) is adopted to fix the heater, and a plurality of binding channels can be carried out according to the firmness and effect. The general iron wire ligature is in the head and the tail of heater width direction, centre and has the position of installation piece.
Then, the thermocouple connection is checked, and the thermocouple is covered with a heat insulation blanket to insulate it from the heating block. And a thermocouple connecting wire is led out along the axial direction of the pipeline and fixed by an iron wire.
And then, leading out the power supply connecting wire of the heater to the side along the axis direction of the pipeline, and fixing the power supply connecting wire by using iron wires.
Finally, the heat preservation cotton is coated on the heater and the thermocouple, and is bound by iron wires. The thickness and the width of the heat-insulating cotton are required to meet the requirements of regulations.
And then, the heater and the thermocouple can be started to respectively perform pipeline heating and temperature measurement.
Fig. 5a is a schematic perspective view of a mounting block 20b that may be used in the track heater 100 of fig. 1 in accordance with another embodiment of the present invention. Fig. 5b is a schematic plan view of the mounting block 20 b. In this embodiment, the mounting block 20b is used to mount an armored thermocouple. As shown in fig. 5a and 5b, the mounting block 20b is formed substantially in a rectangular parallelepiped structure. The mounting block 20b includes a first mounting hole 211 and a second mounting hole 212 which are connected to each other to form a mounting hole 21 for mounting the K-type sheathed thermocouple. The K-shaped armoured thermocouple is in heat conduction connection with the mounting block 20 b. In this case, the mounting block 20b serves as a heat collecting block made of a heat conductive material, and the thermocouple measures the temperature of the pipe through the mounting block 20 b.
Specifically, as shown in fig. 5a and 5b, the first mounting holes 211 are parallel to the upper surface 32 and the lower surface 31 of the mounting block 21, the lower surface 31 being a surface to be in contact with a workpiece for heat transfer, and the first mounting holes 211 are for inserting a K-type sheathed thermocouple (not shown). The first mounting hole 211 is a blind hole having an open end positioned on one end surface 33 of the mounting block 20b and a closed end adjacent to the other end surface 34 opposite to the surface where the open end is positioned, thereby forming a deep hole for stable insertion of the thermocouple. The second mounting hole 212 is substantially perpendicular to the first mounting hole 211, and opens on the upper surface 32 of the mounting block 20b, and preferably the second mounting hole 212 is located at the center of the upper surface 32. The second mounting hole 212 communicates with the first mounting hole 211 for mounting a screw 28 to fix the K-type armoured thermocouple inserted into the first mounting hole 211. In addition, the first mounting hole 211 may extend near the upper surface 32 to facilitate screwing the thermocouple therein.
In this embodiment, both side ends of the mounting block 20b further include hot wire through holes 24 for penetrating a heating wire (not shown). The first mounting hole 211 is located approximately at the center of the mounting block 20b in the direction parallel to the upper surface 32 and the lower surface 31 and parallel to the hot wire through hole 24. The hot wire through hole 24 is offset from the mounting hole 21 (including the first mounting hole 211 and the second mounting hole 212). Preferably, the two through holes 24 are respectively located at both end sides of the mounting block 20b, and the first mounting hole 211 is located at a middle position of the two through holes 24.
To avoid inaccurate measurement results due to heat conduction from the heater wire to the mounting block, a heat insulating device may be provided on the inner wall of the heater wire through hole 24 to thermally insulate the heater wire from the mounting block 20 b. The insulating means may comprise an insulating sleeve 29, for example a ceramic insulating sleeve. Optionally, insulating material such as insulation blanket 27 may also be wrapped around insulating sleeve 29 to further insulate the heat generated by the heater wire.
Further, the lower surface of the mounting block 20b, i.e. the surface of the mounting block that will be in contact with the workpiece, preferably protrudes from the corresponding lower surface of the heating block 10 of the track heater 100. In this way, when the crawler-type heater 100 is coated outside the pipe, the mounting block 20b can more reliably contact the pipe, obtain the same temperature as the pipe, and thus the thermocouple can easily obtain an accurate measurement result. In addition, the surface of the mounting block 20 contacting the pipe may be provided as a concave surface so as to closely contact the pipe, allowing the thermocouple to obtain an accurate measurement result.
When the crawler-type heater 100 with the mounting block 20b of the present embodiment is used for heating a pipe, the operation is as follows:
first, the surface of the pipe to be heat-treated is covered with the surface of the crawler heater, which does not have the mounting holes exposed or the surface having the concave surface facing the pipe to be heat-treated. The width of the pipe to be heated for the heat treatment is checked and aligned with the width of the heater. Checking whether the position of the mounting block on the heater is consistent with the position of the pipeline to be measured in temperature.
Then, an iron wire (or a steel belt) is adopted to fix the heater, and a plurality of binding channels can be carried out according to the firmness and effect. The general iron wire ligature is in the head and the tail of heater width direction, centre and has the position of installation piece.
And then, inserting the end part of the K-shaped armored thermocouple into a deep hole in the center of the side surface of the mounting block, inserting the end part into the bottom, and tightening a fixing screw to fix firmly.
Then, the thermocouple connection condition was checked, and the thermocouple connection wire was led out to the side of the heater along the pipe axis direction and fixed with iron wires.
Then, the heater power connection wire is led out to the side along the axis direction of the pipeline and fixed by iron wires.
Finally, the heat-insulating cotton is coated on a heat treatment heater and is bound by iron wires. The thickness and the width of the heat-insulating cotton are required to meet the requirements of regulations.
Thereafter, the heater and thermocouple may be turned on for pipe heating and temperature measurement, respectively.
The crawler heater of the embodiments of the present invention has the following advantages:
1) The installation block for fixing the thermocouple can be directly connected in series with the plane of the expansion of the crawler heater according to the position required to be measured by the pipeline, and the installation block and the heating block of the crawler heater form a whole.
2) The heat treatment process can keep close contact with the surface of the pipeline, and the measurement is accurate and reliable.
3) The problem of measurement reliability caused by the traditional K-type thermocouple and wire-type thermocouple mounting mode is solved.
4) The thermocouple is simple and convenient to install, and the installation quality is reliable and visible.
Although the above-described embodiment of the present invention uses a screw thermocouple and a sheathed thermocouple as examples of the temperature measuring device, it is apparent that the concept of the present invention of stringing a thermocouple mounting block in a crawler heater is also applicable to other types of temperature measuring devices and achieves the same technical effects.
Therefore, the above embodiments are only for illustrating the technical concept and features of the present invention, and are not intended to limit the scope of the present invention for those skilled in the art to understand the present invention and implement the same. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.

Claims (10)

1. A crawler-type heater comprises a plurality of heating blocks which are connected with each other, and is characterized in that,
further comprising at least one mounting block configured to replace a corresponding number of the plurality of heating blocks and having the same interconnection structure as the heating blocks in the track heater to interconnect the heating blocks;
the mounting block is configured to mount a temperature measuring device to measure a temperature of a workpiece heated by the tracked heater;
the mounting block further comprises a hot wire through hole for penetrating a heating wire; and a mounting hole is formed in the mounting block, and the position of the hot wire through hole is staggered with the position of the mounting hole.
2. The track heater of claim 1, wherein the mounting holes are for mounting screw thermocouples.
3. The crawler heater according to claim 2, wherein the mounting hole includes a large diameter portion for inserting the screw thermocouple and a small diameter portion for mounting a nut screw-coupled with the screw thermocouple.
4. A crawler heater according to claim 3, wherein insulation means are provided in the mounting holes to thermally insulate the screw type thermocouples and the nuts from the mounting blocks.
5. The crawler heater according to any one of claims 2 to 4, wherein the screw type thermocouple is mounted in the mounting block with its end protruding out of the mounting hole.
6. The track heater of claim 1, wherein the mounting block is made of a thermally conductive material and,
the mounting holes are used for mounting the armored thermocouples, and the armored thermocouples are in heat conduction connection with the mounting blocks.
7. The track heater of claim 6, wherein the mounting holes comprise a first mounting hole and a second mounting hole in communication with each other;
the first mounting hole is parallel to the surface of the mounting block, which is to be contacted with the workpiece, and is used for inserting an armored thermocouple; and is also provided with
The second mounting hole is perpendicular to the first mounting hole and is used for mounting a fixing screw.
8. The track heater of claim 6, wherein the track heater comprises a heater unit,
and a heat insulation device is arranged on the inner wall of the hot wire through hole so as to thermally insulate the heating wire from the mounting block.
9. The track heater of claim 8, wherein the insulating means comprises an insulating sleeve.
10. The track heater of any one of claims 6-9, wherein a surface of the mounting block that is to be in contact with the workpiece protrudes from a corresponding surface of the heating block of the track heater.
CN201910538091.7A 2019-06-20 2019-06-20 Crawler-type heater Active CN110157885B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11105106A (en) * 1997-10-06 1999-04-20 Japan Steel Works Ltd:The Structure of thermocouple mount for heating cylinder
JP2016085864A (en) * 2014-10-27 2016-05-19 日本特殊陶業株式会社 Heater with thermoelectric couple, and gas sensor with the same
CN205501345U (en) * 2015-05-14 2016-08-24 天津三元鼎盛科技有限公司 Module fast -assembling type heat treatment furnace
CN206553588U (en) * 2017-03-29 2017-10-13 中国水利水电第十工程局有限公司 Novel steel tube integrally annealed stove
CN207749153U (en) * 2017-12-26 2018-08-21 中国石油天然气第一建设有限公司 A kind of pipeline-weld heat treatment heating and heat insulation integrated device
CN108977647A (en) * 2018-09-27 2018-12-11 中国电建集团山东电力建设第工程有限公司 Boiler heating surface pin post weld heat treatment special tooling and heat treatment method
CN210176920U (en) * 2019-06-20 2020-03-24 福建晋江热电有限公司 Crawler-type heater

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11105106A (en) * 1997-10-06 1999-04-20 Japan Steel Works Ltd:The Structure of thermocouple mount for heating cylinder
JP2016085864A (en) * 2014-10-27 2016-05-19 日本特殊陶業株式会社 Heater with thermoelectric couple, and gas sensor with the same
CN205501345U (en) * 2015-05-14 2016-08-24 天津三元鼎盛科技有限公司 Module fast -assembling type heat treatment furnace
CN206553588U (en) * 2017-03-29 2017-10-13 中国水利水电第十工程局有限公司 Novel steel tube integrally annealed stove
CN207749153U (en) * 2017-12-26 2018-08-21 中国石油天然气第一建设有限公司 A kind of pipeline-weld heat treatment heating and heat insulation integrated device
CN108977647A (en) * 2018-09-27 2018-12-11 中国电建集团山东电力建设第工程有限公司 Boiler heating surface pin post weld heat treatment special tooling and heat treatment method
CN210176920U (en) * 2019-06-20 2020-03-24 福建晋江热电有限公司 Crawler-type heater

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