CN111889955A - Novel preheating device for surfacing of end face of cylinder and using method - Google Patents
Novel preheating device for surfacing of end face of cylinder and using method Download PDFInfo
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- CN111889955A CN111889955A CN202010776409.8A CN202010776409A CN111889955A CN 111889955 A CN111889955 A CN 111889955A CN 202010776409 A CN202010776409 A CN 202010776409A CN 111889955 A CN111889955 A CN 111889955A
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- preheating pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
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- Engineering & Computer Science (AREA)
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- Arc Welding In General (AREA)
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Abstract
The invention provides a novel preheating device for surfacing of the end face of a cylinder and a using method, and belongs to the field of welding preheating. The inner preheating pipe and the outer preheating pipe are both arc-shaped, two ends of the inner preheating pipe and the outer preheating pipe are sealed through plugs, the inner preheating pipe and the outer preheating pipe are concentrically aligned and placed on the movable hook, an inner air inlet connecting pipe of the inner preheating pipe is communicated with an outer air inlet connecting pipe of the outer preheating pipe through a rubber pipe, an inner combustion nozzle and an outer combustion nozzle are respectively arranged at positions at certain central angles of an interval between the outer side of the inner preheating pipe and the inner side of the outer preheating pipe, and an inner positioning needle and an outer positioning needle are respectively arranged at positions at opposite centers of the outer side of the inner preheating pipe and the inner side of the outer preheating pipe. According to the novel preheating device for the surfacing of the end face of the cylinder and the using method, the preheating device is simple in structure, convenient to operate, good in universality and wide in usable range, the manufacturing cost of a new tool is reduced, and the preheating and postheating efficiencies are improved.
Description
Technical Field
The invention relates to a preheating device for surfacing of the end surface of a barrel and a use method thereof, belonging to the field of welding preheating.
Background
The steam cooler is an important device for condensing redundant superheated steam generated by a steam generator, preheating and post-heating are needed when the end surface of the cylinder body is built up, and because the size of the cylinder body of the product is large and the preheating surface is in an arc shape, the requirement of simultaneous preheating is difficult to achieve according to the existing device. Meanwhile, the product of the type has multiple dimensions, and if a conventional preheating means is used, devices with multiple dimensions need to be designed to realize the purpose of preheating.
The preheating device for the surfacing of the end face of the cylinder is designed, the difficult problem that the preheating requirement of the end face of the large-diameter cylinder body is difficult to guarantee is solved, and meanwhile, the preheating device has good universality for meeting various dimensions.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and further provides a novel preheating device for surfacing of the end face of a cylinder and a using method.
The purpose of the invention is realized by the following technical scheme:
a novel preheating device for build-up welding of the end face of a cylinder and a using method thereof are disclosed, the preheating device for build-up welding of the end face of the cylinder and the using method thereof comprise a heating part and a frame part, the frame part comprises a bolt, a first nut, a movable hook, an L-shaped adjusting bracket, a positioning pin and a support, the support and one end of the L-shaped adjusting bracket are fixed through the positioning pin, and the other end of the L-shaped adjusting bracket is fixed with the movable hook through the first bolt and the first nut;
the heating part consists of an inner preheating pipe and an outer preheating pipe, the inner preheating pipe comprises an inner combustion pipe, an inner combustion nozzle, a plug, an inner air inlet connecting pipe and an inner positioning needle, the outer preheating pipe comprises an outer combustion pipe, an outer combustion nozzle, a plug, an outer air inlet connecting pipe, an outer positioning needle, an air inlet nozzle and a nut II, the inner preheating pipe and the outer preheating pipe are both arc-shaped, two ends of the inner preheating pipe and the outer preheating pipe are sealed through the plugs, the inner preheating pipe and two ends of the outer preheating pipe are provided with the inner air inlet connecting pipe and the outer air inlet connecting pipe, the inner preheating pipe and the outer preheating pipe are concentrically aligned and placed on the movable hook, the inner air inlet connecting pipe of the inner preheating pipe and the outer air inlet connecting pipe of the outer preheating pipe are communicated through rubber pipes, the inner combustion nozzle and the outer combustion nozzle are respectively arranged on the outer side of the inner preheating pipe and the inner side of the outer preheating pipe at a position with a certain central angle, the inner positioning needle and the outer positioning needle are respectively arranged on the, the outer side of the central position of the outer preheating pipe is communicated with one end of an outer air inlet connecting pipe, and the other end of the outer air inlet connecting pipe is fixedly provided with an air inlet nozzle through a second nut; each heating section requires two sets of frame portions to be secured.
The invention relates to a novel preheating device for surfacing of the end face of a cylinder, wherein a movable hook comprises two symmetrical L-shaped hooks, and the angle range of the movable hook capable of being freely opened and closed is 0-180 degrees.
According to the novel preheating device for the end surface overlaying of the cylinder, air can be mixed into the notches formed at the bottoms of the inner combustion nozzle and the outer combustion nozzle.
According to the novel barrel end surface surfacing preheating device, the distance between the inner preheating pipe and the outer preheating pipe which are arranged on the two sides of the barrel is realized by the length of the positioning needle.
According to the novel preheating device for the end surface overlaying of the barrel, the L-shaped adjusting support is provided with the plurality of gears, and the height of the L-shaped adjusting support can be adjusted on the support through the positioning pin.
The invention relates to a novel preheating device for surfacing of the end face of a cylinder, wherein combustion nozzles are arranged at the outer side of an inner preheating pipe and the inner side of an outer preheating pipe at a certain circle center angle, and the angle range of the certain circle center angle is 9-10 degrees.
The invention relates to a novel preheating device for surfacing of the end face of a cylinder body, wherein the circle center angle of a heating part is 90 degrees, one cylinder body to be welded is fixed through three heating parts and six frame parts, and the three heating parts are uniformly distributed on the cylinder body.
The invention discloses a using method of a novel barrel end surface overlaying preheating device, which comprises the following steps:
the method comprises the following steps: placing the support at a proper position around the cylinder to be welded, and adjusting the support until the movable hook is positioned right above the end surface to be preheated;
step two: adjusting the L-shaped adjusting bracket to a proper height, and fixing by using a positioning pin;
step three: assembling a bolt, a nut II and a movable hook at the other end of the L-shaped bracket;
step four: placing the outer preheating pipe and the inner preheating pipe on the movable hook on the inner side and the outer side of the cylinder body, and connecting the outer preheating pipe and the inner preheating pipe by using rubber pipes;
step five: connecting the air inlet nozzle of the outer preheating pipe with the air bottle, and igniting after the inner preheating pipe and the outer preheating pipe are filled with combustible gas;
step six: according to the actual condition of the device burning, the position of the support and the height of the L-shaped adjusting bracket are adjusted.
According to the application method of the novel preheating device for the end surface overlaying of the cylinder, the specific height adjustment in the second step needs to be adjusted according to the combustion condition.
According to the using method of the novel barrel end surface surfacing preheating device, in the sixth step, the preheating position of the flame is adjusted by adjusting the height of the support according to the specific combustion exuberance degree of the flame.
According to the novel preheating device for the end surface overlaying of the cylinder and the using method, the preheating device is simple in structure, convenient to operate, good in universality and wide in usable range, the manufacturing cost of a new tool is reduced, and the preheating and postheating efficiencies are improved; this novel build-up welding preheating device has solved the difficult technical problem that preheats before jumbo size stack end face is built-up welding, through changing the preheater tube, can satisfy the stack of different specifications, simultaneously, adopts the form of activity couple and pilot pin, and applicable in the stack wall thickness of difference, adjusts the support and can carry out height control to satisfy the not product stack of co-altitude.
Drawings
Fig. 1 is a schematic structural diagram of a novel preheating device for barrel end surface surfacing and a use method thereof.
Fig. 2 is an installation schematic diagram of the novel barrel end surface overlaying preheating device and the use method thereof.
Fig. 3 is a schematic view of a movable hook according to the present invention.
Fig. 4 is a schematic view of a front view of an inner preheater tube according to the present invention.
FIG. 5 is a schematic view of an inner preheater tube according to the present invention.
Fig. 6 is a cross-sectional view a-a of fig. 5.
Fig. 7 is a schematic view of the outer preheater tube of the present invention from the front.
FIG. 8 is a schematic view of an outer preheater tube according to the present invention.
Fig. 9 is a cross-sectional view of B-B in fig. 8.
FIG. 10 is a schematic view showing the communication between the inner and outer preheating tubes in the present invention.
FIG. 11 is a schematic view showing the connection of the inner and outer preheater tubes in the present invention.
The reference numbers in the figures are: 1 is a bolt; 2 is a first nut; 3 is a movable hook; 4 is an L-shaped adjusting bracket; 5 is a positioning pin; 6 is a support; 7 is an outer preheating pipe; 8 is an inner preheating pipe; 9 is a rubber tube; 10 is a plug; 7-2 is an external combustion nozzle; 7-3 is a second nut; 7-4 is an air inlet nozzle; 7-5 is an external air inlet connecting pipe; 7-6 are external positioning needles; 7-7 is an external combustion pipe; 8-2 is an internal combustion nozzle; 8-3 is an inner positioning needle; 8-4 is an inner burning pipe; 8-5 is an internal air inlet connecting pipe.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.
The first embodiment is as follows: as shown in fig. 1 to 11, the novel preheating device for barrel end face surfacing according to the embodiment includes a heating portion and a frame portion, the frame portion includes a bolt, a first nut, a movable hook, an L-shaped adjusting bracket, a positioning pin and a support, the support and one end of the L-shaped adjusting bracket are fixed by the positioning pin, and the other end of the L-shaped adjusting bracket is fixed with the movable hook by the first bolt and the first nut; the movable hook is fixedly arranged at the end point of the L-shaped bracket.
The heating part consists of an inner preheating pipe and an outer preheating pipe, the inner preheating pipe comprises an inner combustion pipe, an inner combustion nozzle, a plug, an inner air inlet connecting pipe and an inner positioning needle, the outer preheating pipe comprises an outer combustion pipe, an outer combustion nozzle, a plug, an outer air inlet connecting pipe, an outer positioning needle, an air inlet nozzle and a nut II, the inner preheating pipe and the outer preheating pipe are both arc-shaped, two ends of the inner preheating pipe and two ends of the outer preheating pipe are sealed through the plugs, the inner preheating pipe and the outer preheating pipe are concentrically aligned and placed on the movable hook, the inner air inlet connecting pipe of the inner preheating pipe is communicated with the outer air inlet connecting pipe of the outer preheating pipe through a rubber pipe, the inner combustion nozzle and the outer combustion nozzle are respectively arranged at positions at a certain central angle interval between the outer side of the inner preheating pipe and the inner side of the outer preheating pipe, the inner positioning needle and the outer positioning needle are respectively arranged at positions opposite to the center of the outer preheating pipe, and one end of the outer air inlet connecting pipe is, the other end of the outer air inlet connecting pipe is fixedly provided with an air inlet nozzle through a second nut; each heating section requires two sets of frame portions to be secured.
The bottom of the support is directly and horizontally placed on the ground. Through calculating during the design, guarantee that the bottom has certain weight, make the whole device can not topple over.
The movable hook comprises two symmetrical L-shaped hooks, the angle range of the movable hook capable of freely opening and closing is 0-180 degrees, the two hooks naturally droop under the action of gravity without structural limitation, the initial angle is indefinite, and after the combustion pipe is placed on the movable hook, the movable hook naturally opens and closes due to the fact that a certain distance is controlled between the inner combustion pipe and the outer combustion pipe through the positioning needle. The movable hook is composed of hanging rods forming an obtuse angle, one ends of the two hanging rods are fixed on the L-shaped support through bolts and nuts, and after the preheating pipe is placed on the movable hanging rods, the other ends of the two hanging rods are parallel.
The notches at the bottom of the inner combustion nozzle and the outer combustion nozzle can be mixed with air, and the purpose of combustion heating is achieved after ignition. As shown in fig. 6, the incisions are horseshoe-shaped, with an angle of 60 degrees between the two incisions.
The distance between the inner preheating pipe and the outer preheating pipe which are arranged on the two sides of the cylinder body is realized by the length of the positioning needle. The length of the positioning needle of the inner preheating pipe and the length of the positioning needle of the outer preheating pipe are the same, the length of the positioning needle can be adjusted according to the requirement of preheating temperature, and when the required preheating temperature is lower, shorter positioning needles can be welded on the inner preheating pipe and the outer preheating pipe.
A plurality of gears are arranged on the L-shaped adjusting support, and the height of the L-shaped adjusting support can be adjusted on the support through the positioning pin.
The outer side of the inner preheating pipe and the inner side of the outer preheating pipe are provided with combustion nozzles at a certain central angle, and the angle range of the certain central angle is 9-10 degrees. The heating part is a quarter of circular arc, namely a central angle of 90 degrees, if the central angle is 9 degrees, one combustion nozzle is arranged, and the heating part is provided with 11 combustion nozzles in total; if central angle interval 10 sets up a burner, the heating part is provided with 10 burners altogether, sets up the burner that quantity equals on the inside and outside preheating tube, guarantees that the burning preheats the area ratio global even. The pilot pin passes through the welded mode to be fixed on the preheater tube, forms the acute angle between pilot pin and the combustion nozzle, and the scope that this angle is 45 ~ 60, through pilot pin, combustion nozzle and the flame length of predicting, the specific angle of comprehensive calculation pilot pin and combustion nozzle.
The circle center angle of the heating parts is 90 degrees, one to-be-welded cylinder body is fixed through the three heating parts and the six frame parts, and the three heating parts are uniformly distributed on the cylinder body. A heating part is fixed at intervals of 30 degrees on the inner side and the outer side of the barrel, two ends of the heating part are respectively fixed by a frame part, namely, the preheating work before welding is realized by three heating parts and six frame parts around the whole barrel.
Example two: as shown in fig. 1 to 11, in the application method of the novel cylinder end-face weld-up preheating device according to this embodiment, the application method of the novel cylinder end-face weld-up preheating device includes the specific steps of:
the method comprises the following steps: the supports are arranged at proper positions around the cylinder to be welded, the distance between each support and the cylinder is ensured to be the same, and the proper positions mean that the supports are adjusted until the movable hooks are positioned right above the end surface to be preheated;
step two: adjusting the L-shaped adjusting bracket to a proper height, and fixing by using a positioning pin; the proper height can be adjusted in the preheating process according to the combustion condition;
step three: assembling a bolt, a nut I and a movable hook at one end of the L-shaped adjusting bracket;
step four: placing an outer preheating pipe and an inner preheating pipe on the inner side and the outer side of the cylinder body on the movable hooks, and connecting the inner air inlet connecting pipe and the outer air inlet connecting pipe by using a rubber pipe;
step five: connecting the air inlet nozzle of the outer preheating pipe with the air bottle, and igniting after the inner preheating pipe and the outer preheating pipe are filled with combustible gas; any method can be used to sense when gas flows out of the combustion nozzle, namely full filling;
step six: adjusting the position of the support and the height of the L-shaped adjusting bracket according to the actual combustion condition of the device; according to the specific combustion exuberance degree of the flame, the preheating position of the flame is adjusted by adjusting the height of the support, and when the flame is more exuberant, the position of the adjusting support moves in the direction away from the cylinder wall and the height of the L-shaped adjusting support is increased; when the flame is weak, the position of the adjusting support moves towards the direction close to the cylinder wall and the height of the L-shaped adjusting support is reduced.
When the preheating temperature requirement is met, the preheating is finished, and when the outer flame of the combustion flame does not reach the designated preheating area, the gear of the L-shaped bracket is controlled by adjusting the positioning pin, so that the outer flame of the combustion flame reaches the designated preheating area.
The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The novel preheating device for the barrel end face surfacing is characterized by comprising a heating part and a frame part, wherein the frame part comprises a bolt (1), a nut I (2), a movable hook (3), an L-shaped adjusting support (4), a positioning pin (5) and a support (6), the support (6) and one end of the L-shaped adjusting support (4) are fixed through the positioning pin (5), and the movable hook (3) is fixed at the other end of the L-shaped adjusting support (4) through the bolt (1) and the nut I (2);
the heating part consists of an inner preheating pipe (8) and an outer preheating pipe (7), the inner preheating pipe (8) comprises an inner combustion pipe (8-4), an inner combustion nozzle (8-2), a plug (10), an inner air inlet connecting pipe (8-5) and an inner positioning needle (8-3), the outer preheating pipe (7) comprises an outer combustion pipe (7-7), an outer combustion nozzle (7-2), a plug (10), an outer air inlet connecting pipe (7-5), an outer positioning needle (7-6), an air inlet nozzle (7-4) and a second nut (7-3), the inner preheating pipe (8) and the outer preheating pipe (7) are both arc-shaped, two ends of the inner preheating pipe (8) and the outer preheating pipe (7) are sealed through the plug (10), the inner air inlet connecting pipe (8-5) and the outer air inlet connecting pipe (7-5) are arranged at two ends of the inner preheating pipe (8) and the outer preheating pipe (9), the inner preheating pipe (8) and the outer preheating pipe (9) are concentrically arranged on the movable hook in an alignment way, an inner air inlet connecting pipe (8-5) of the inner preheating pipe (8) is communicated with an outer air inlet connecting pipe (7-5) of the outer preheating pipe (7) through a rubber pipe (9), the outer side of the inner preheating pipe (8) and the inner side of the outer preheating pipe (7) are respectively provided with an inner combustion nozzle (8-2) and an outer combustion nozzle (7-2) at positions which are separated by a certain central angle, the central opposite positions of the outer side of the inner preheating pipe (8) and the inner side of the outer preheating pipe (7) are respectively provided with an inner positioning needle (7-6) and an outer positioning needle (8-3), the outer side of the central position of the outer preheating pipe (7) is communicated with one end of an outer air inlet connecting pipe (7-5), and the other end of the outer air inlet connecting pipe (7-5) is fixedly provided with an air inlet nozzle (7-4) through a second nut (7-3); each heating section requires two sets of frame portions to be secured.
2. The novel preheating device for the end face surfacing of the cylinder body according to claim 1, wherein the movable hook (3) comprises two symmetrical L-shaped hooks, and the angle range of the movable hook (3) which can be freely opened and closed is 0-180 degrees.
3. A novel preheating device for build-up welding of cylinder end face according to claim 1 is characterized in that the bottom processing cuts of the inner combustion nozzle (8-2) and the outer combustion nozzle (7-2) can be mixed with air.
4. A novel preheating device for build-up welding of the end face of a cylinder body according to claim 1, characterized in that the distance between the inner preheating tube (8) and the outer preheating tube (8) arranged at the two sides of the cylinder body is realized by the length of a positioning needle.
5. The novel preheating device for the end face overlaying of the cylinder body and the using method of the novel preheating device are characterized in that a plurality of gears are arranged on the L-shaped adjusting support (4), and the height of the L-shaped adjusting support (4) can be adjusted on the support (6) through the positioning pin (5).
6. The novel preheating device for the surfacing of the end face of the cylinder body and the using method of the novel preheating device according to claim 1 are characterized in that a combustion nozzle is arranged on the outer side of the inner preheating pipe (8) and the inner side of the outer preheating pipe (7) at a certain central angle, and the certain central angle ranges from 9 degrees to 10 degrees.
7. The novel preheating device for the end face surfacing of the cylinder body and the using method of the novel preheating device for the end face surfacing of the cylinder body according to claim 1 are characterized in that the angle of the circle center of the heating part is 90 degrees, one cylinder body to be welded is fixed through three heating parts and six frame parts, and the three heating parts are uniformly distributed on the cylinder body.
8. The use method of the novel cylinder end face overlaying preheating device according to claims 1 to 7 is characterized by comprising the following steps:
the method comprises the following steps: the support (6) is placed at a proper position around the cylinder to be welded, and the support (6) is adjusted until the movable hook (3) is positioned right above the end surface to be preheated;
step two: adjusting the L-shaped adjusting bracket (4) to a proper height, and fixing by using a positioning pin (5);
step three: a bolt (1), a nut I (2) and a movable hook (3) are assembled at the other end of the L-shaped adjusting bracket (4);
step four: an outer preheating pipe (7) and an inner preheating pipe (8) are placed on the movable hook (3) at the inner side and the outer side of the cylinder body and are connected by a rubber pipe (9);
step five: connecting an air inlet nozzle (7-4) of the outer preheating pipe (7) with the air bottle, and igniting after the inner preheating pipe and the outer preheating pipe are filled with combustible gas;
step six: according to the actual condition of the device combustion, the position of the support (6) and the height of the L-shaped adjusting bracket (4) are adjusted.
9. The use method of the novel preheating device for barrel end face surfacing according to claim 8, wherein the specific height adjustment in the second step is adjusted according to the combustion condition.
10. The use method of the novel preheating device for the surfacing of the end face of the cylinder body according to claim 8 is characterized in that in the sixth step, the preheating position of the flame is adjusted by adjusting the height of the bracket according to the specific combustion exuberance degree of the flame.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010776409.8A CN111889955B (en) | 2020-08-05 | 2020-08-05 | Novel preheating device for surfacing of end face of cylinder and using method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010776409.8A CN111889955B (en) | 2020-08-05 | 2020-08-05 | Novel preheating device for surfacing of end face of cylinder and using method |
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| CN111889955A true CN111889955A (en) | 2020-11-06 |
| CN111889955B CN111889955B (en) | 2022-04-29 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001207216A (en) * | 1999-11-18 | 2001-07-31 | Dai Ichi High Frequency Co Ltd | Heat treatment method and device for metallic cylindrical body |
| CN101761935A (en) * | 2009-10-21 | 2010-06-30 | 上海锅炉厂有限公司 | Rotary high-temperature air preheater |
| CN202766579U (en) * | 2012-08-06 | 2013-03-06 | 中国联合工程公司 | Annular bell-type resistance furnace for heating cylindrical shell section of pressure container |
| CN205420488U (en) * | 2016-03-24 | 2016-08-03 | 安徽心连心重型封头有限公司 | Spherical head thermal treatment fixes frock |
| CN110280928A (en) * | 2019-04-11 | 2019-09-27 | 镇江市高等专科学校 | A kind of adjustable flange resurfacing welding heating device |
-
2020
- 2020-08-05 CN CN202010776409.8A patent/CN111889955B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001207216A (en) * | 1999-11-18 | 2001-07-31 | Dai Ichi High Frequency Co Ltd | Heat treatment method and device for metallic cylindrical body |
| CN101761935A (en) * | 2009-10-21 | 2010-06-30 | 上海锅炉厂有限公司 | Rotary high-temperature air preheater |
| CN202766579U (en) * | 2012-08-06 | 2013-03-06 | 中国联合工程公司 | Annular bell-type resistance furnace for heating cylindrical shell section of pressure container |
| CN205420488U (en) * | 2016-03-24 | 2016-08-03 | 安徽心连心重型封头有限公司 | Spherical head thermal treatment fixes frock |
| CN110280928A (en) * | 2019-04-11 | 2019-09-27 | 镇江市高等专科学校 | A kind of adjustable flange resurfacing welding heating device |
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| CN111889955B (en) | 2022-04-29 |
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