CN115430970B - Steam heat-insulating pipe and inner and outer pipe welding process system of heat-insulating pipe - Google Patents
Steam heat-insulating pipe and inner and outer pipe welding process system of heat-insulating pipe Download PDFInfo
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- CN115430970B CN115430970B CN202211008057.7A CN202211008057A CN115430970B CN 115430970 B CN115430970 B CN 115430970B CN 202211008057 A CN202211008057 A CN 202211008057A CN 115430970 B CN115430970 B CN 115430970B
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- rolling roller
- pipe
- circular arc
- inner tube
- strip
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- 238000003466 welding Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims description 24
- 229920000742 Cotton Polymers 0.000 claims abstract description 22
- 238000005452 bending Methods 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims description 139
- 238000009413 insulation Methods 0.000 claims description 23
- 238000001125 extrusion Methods 0.000 claims description 19
- 230000005489 elastic deformation Effects 0.000 claims description 8
- 230000003068 static effect Effects 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000000007 visual effect Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
Classifications
-
- 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
- B23K37/02—Carriages for supporting the welding or cutting element
- B23K37/0276—Carriages for supporting the welding or cutting element for working on or in tubes
-
- 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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
- B23K31/027—Making tubes with soldering or welding
-
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Thermal Insulation (AREA)
Abstract
The invention discloses a steam heat-insulating pipe, which comprises an inner pipe and an outer pipe which are coaxial, wherein heat-insulating cotton is filled between the inner pipe and the outer pipe; two circular arc holding strips are arranged at any one end of the outer tube, the middle part of each circular arc holding strip is a circular arc section coaxial with the inner tube, and the two ends of each circular arc holding strip are straight line sections tangent with the circular arc sections; the circular arc holding strip is formed by bending the middle section by a straight line strip; the arc sections of the two arc holding strips are symmetrically held tightly on the outer wall of the inner tube, and the tail ends of the two straight line sections of each arc holding strip are welded with the end face of the outer tube; because the circular arc holding strips are not directly welded on the inner tube, the outer diameter expansion of the inner tube caused by temperature rise can further elastically deform each circular arc rubber strip, and the circular arc holding strips cannot be rigidly transmitted, so that the welding seams at the two ends of the circular arc holding strips are prevented from being split due to rigid tensile force, and the temperature difference resistance strength performance between the inner tube and the outer tube is further enhanced.
Description
Technical Field
The invention belongs to the field of steam heat-insulating pipes.
Background
The heat insulation cotton is filled between the inner tube and the outer tube of the steam heat insulation tube, and as the heat insulation cotton is of a flexible structure, relative displacement in the radial direction can occur between the inner tube and the outer tube due to gravity and other factors over time, the coaxiality degree of the inner tube and the outer tube can be gradually reduced, the heat insulation cotton clamped between the inner tube and the outer tube is further subjected to local extrusion, and further the phenomenon of local densification of the heat insulation cotton is caused, so that heat is more easily transferred to the outer tube from the local extrusion position of the heat insulation cotton, and the overall heat insulation performance is further reduced; therefore, the inner tube and the outer tube need to be relatively fixed by using a welding structure, and the inner tube and the outer tube are generally welded integrally by using a welding bracket in the prior art, and the application number is as follows: a thermal insulation tube structure of CN 202021989777.2;
when the inner tube passes through high-temperature steam, the temperature of the inner tube can be rapidly increased, the outer tube is directly contacted with the external cold environment, and heat-insulating cotton is arranged between the inner tube and the outer tube at intervals, so that a very large temperature difference is generated between the inner tube and the outer tube, the thermal expansion between the inner tube and the outer tube is asynchronous, a welding bracket integrally connected between the inner tube and the outer tube generates rigid stress, and the risk of stretching a welding part exists in a long time; therefore, a connecting structure which can realize the relative fixation of the inner tube and the outer tube and can avoid the cracking of the connecting piece between the inner tube and the outer tube due to the rigid stress needs to be designed;
the following is partly based on the structural features of the new design of the present invention and therefore does not belong entirely to the prior art part:
as shown in fig. 3, as a certain pretension exists on the straight line segment 016.1 at the two ends of the circular arc holding strip 016 after the two ends of the circular arc holding strip 016 are welded, a extrusion force is formed between the circular arc rubber strip 017 and the outer wall of the inner tube 4, and the stable extrusion force ensures the maximum static friction force between each circular arc rubber strip 017 and the outer wall of the inner tube 4 so as to meet the axial positioning requirement between the inner tube 4 and the outer tube 5 and avoid the axial relative displacement between the inner tube 4 and the outer tube 5; in the existing welding process, the effect that a strip structure still has pretension after the two ends of the strip structure are welded cannot be achieved; therefore, it is necessary to design a welding process to achieve a process system in which a certain pretension exists in the straight line segment 016.1 at the two ends of the arc holding strip 016 after the two ends of the arc holding strip 016 are welded.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the invention provides a steam heat-insulating pipe and an inner pipe and outer pipe welding process system of the heat-insulating pipe, and the welding process realizes that a certain pretension exists on straight line sections at two ends of an arc holding strip after the two ends of the arc holding strip are welded, so that the axial positioning requirement between the inner pipe and the outer pipe is met.
The technical scheme is as follows: in order to achieve the aim, the steam heat-insulating pipe comprises a steam heat-insulating pipe, wherein the steam heat-insulating pipe comprises an inner pipe and an outer pipe which are coaxial, and heat-insulating cotton is filled between the inner pipe and the outer pipe;
two circular arc holding strips are arranged at any one end of the outer tube, the middle part of each circular arc holding strip is a circular arc section coaxial with the inner tube, and the two ends of each circular arc holding strip are straight line sections tangent with the circular arc sections;
the circular arc holding strip is formed by bending the middle section by a straight line strip; the arc sections of the two arc holding strips are symmetrically held tightly on the outer wall of the inner tube, and the tail ends of the two straight line sections of each arc holding strip are welded with the end face of the outer tube.
Further, a rubber strip embedding groove is formed in one side of the middle section of the straight line along the length direction, a straight rubber strip is embedded in the rubber strip embedding groove along the length direction, and after the middle section of the straight line is bent into an arc holding strip, the straight rubber strip is changed into an arc rubber strip; and the circular arc rubber strip at the inner side of the circular arc section of the circular arc holding strip is attached to the outer wall of the inner pipe.
Furthermore, the straight line sections at the two ends of each circular arc holding strip have pretension, so that each circular arc rubber strip is elastically deformed under the extrusion of the outer wall of the inner pipe; when the inner tube passes through steam, the outer diameter expansion of the inner tube caused by temperature rise can further elastically deform each circular arc rubber strip.
Further, the linear rubber strip is adhered to the bottom of the rubber strip embedded groove through an adhesive.
The inner and outer pipe welding process system of the steam heat-insulating pipe comprises an outer pipe arc placing groove, wherein the middle section of the outer pipe of the steam heat-insulating pipe is laid in the outer pipe arc placing groove coaxially; front and rear sides of the outer tube placing seat are respectively provided with a front welding auxiliary unit and a rear welding auxiliary unit which are symmetrical in structure front and rear; the front welding auxiliary unit and the rear welding auxiliary unit clamp the outer walls of the two ends of the inner tube of the steam heat-insulating tube respectively.
Further, the front welding auxiliary unit comprises an A rolling roller, a B rolling roller, a C rolling roller and a D rolling roller; the rolling roller A and the rolling roller B are bilaterally symmetrical to the upper side of the inner tube, and the rolling roller C and the rolling roller D are bilaterally symmetrical to the lower side of the inner tube; the welding machine also comprises two vertical and horizontal straight lines to be welded; the lower surface of the middle section of the straight line is tangent to the upper end of the inner tube, and the upper surface is tangent to the rolling roller A and the rolling roller B in a rolling way; the upper surface of the middle section of the other straight line is tangent to the lower end of the inner tube, and the lower surface is tangent to the C rolling roller and the D rolling roller in a rolling way; the rolling roller A, the rolling roller B, the rolling roller C and the rolling roller D can all move along the circular contour path of the inner tube under the axial visual angle, so that the middle section of the straight line is correspondingly bent and deformed along the circular contour path of the inner tube.
Further, one ends of the rolling roller A, the rolling roller B, the rolling roller C and the rolling roller D, which are far away from the end face of the outer tube, are provided with limiting outer edges along the outline, so that the straight line bar is clamped between the end face of the outer tube and each limiting outer edge.
Further, the specific process of the inner and outer pipe welding process system of the steam heat preservation pipe comprises the following steps:
firstly, primarily assembling an inner pipe, an outer pipe and heat-insulating cotton;
step two, the middle section of the outer pipe of the steam heat-insulating pipe is laid in the arc placing groove of the outer pipe coaxially, and then the front welding auxiliary unit and the rear welding auxiliary unit clamp the outer walls of the two ends of the inner pipe of the steam heat-insulating pipe respectively;
the rolling motion of the rolling roller A and the rolling roller B gradually and mutually far away along the circular contour path of the inner tube under the axial visual angle, the rolling motion of the rolling roller C and the rolling roller D gradually and mutually far away along the circular contour path of the inner tube under the axial visual angle, the middle sections of the two straight lines are bent and deformed gradually with larger bending length along the circular contour path of the inner tube, so that the two straight lines are symmetrically bent into arc holding strips with the two middle sections being arc sections, the two arc holding strips are tightly held tightly on the outer wall surface of the inner tube, the original straight rubber strips on the two arc holding strips are changed into arc rubber strips, and extrusion force is formed between the arc rubber strips and the outer wall of the tightly attached inner tube to generate elastic deformation; when the tail ends of the straight line sections at the two ends of the two circular arc holding strips just move to be overlapped with the end face of the outer tube, the rolling roller A, the rolling roller B, the rolling roller C and the rolling roller D are changed from a moving state to a static state at the same time, and at the moment, a state that the circular arc rubber strips on the circular arc holding strips and the outer wall of the tightly attached inner tube form extrusion force to generate elastic deformation is a holding state;
and fourthly, welding the superposition of the tail ends of the straight line sections at the two ends of each circular arc holding strip and the end face of the outer tube by a welding robot or manually, and forming a fixed welding line.
Step five, after the weld joint to be formed is cooled, the rolling roller A and the rolling roller B and the rolling roller C and the rolling roller D are separated from two circular arc holding strips welded on the end face of the outer tube respectively; after the rolling constraint of the rolling roller A and the rolling roller B and the rolling constraint of the rolling roller C and the rolling roller D are lost by the two circular arc holding strips, the circular arc rubber strips which are in the extruded state on the two circular arc holding strips have the trend of recovering to the free state, so that the circular arc rubber strips form certain elastic expansion force on the middle parts of the circular arc holding strips, and the straight line sections at the two ends of the circular arc holding strips generate pretension.
The beneficial effects are that: because the circular arc holding strips are not directly welded on the inner tube, the outer diameter expansion of the inner tube caused by temperature rise can further elastically deform each circular arc rubber strip, and the circular arc rubber strips cannot be rigidly transmitted to the circular arc holding strips, so that the weld joints at the two ends of the circular arc holding strips are prevented from being split due to rigid tensile force, and the temperature difference resistance strength performance between the inner tube and the outer tube is further enhanced;
after the two ends of the arc holding strip are welded, the straight line sections at the two ends of the arc holding strip still have certain pretension, so that the straight line sections at the two ends of the arc holding strip have certain pretension, extrusion force is formed between the arc rubber strip and the outer wall of the inner tube, the stable extrusion force ensures the maximum static friction force between each arc rubber strip and the outer wall of the inner tube, the axial positioning requirement between the inner tube and the outer tube is met, and the axial relative displacement between the inner tube and the outer tube is avoided.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a steam insulating pipe;
FIG. 2 is a schematic diagram showing the overall disassembly of the steam insulating pipe;
FIG. 3 is an axial schematic diagram of a steam insulation pipe after inner and outer pipes are welded and fixed;
FIG. 4 is a schematic view of a straight line bar structure which is not bent yet;
FIG. 5 is a schematic diagram of the overall structure of a welding process system;
FIG. 6 is a schematic diagram of the middle section of the outer tube of the steam insulation tube in the corresponding step two lying on the same axis in the outer tube arc placing groove, and the front welding auxiliary unit and the rear welding auxiliary unit are respectively clamped on the outer walls of the two ends of the inner tube of the steam insulation tube;
FIG. 7 is an enlarged partial schematic view of FIG. 6;
FIG. 8 is an axial view of FIG. 6;
FIG. 9 is a schematic view showing a state in which two straight lines are bent into circular arc holding bars based on FIG. 8 (see "step three end arc or step four start portion")
FIG. 10 is a schematic perspective view of FIG. 9;
FIG. 11 is a schematic view of the partial structure of FIG. 10 with the inner and outer tubes removed.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
The steam heat-insulating pipe shown in figures 1 to 11 comprises a steam heat-insulating pipe shown in figures 1, 2 and 3, wherein the steam heat-insulating pipe comprises an inner pipe 4 and an outer pipe 5 which are coaxial, and heat-insulating cotton 3 is filled between the inner pipe 4 and the outer pipe 5; as shown in fig. 2, the cylindrical heat-insulating cotton 3 is formed by splicing an A-flap heat-insulating cotton 3.1 and a B-flap heat-insulating cotton 3.2, two circular arc holding strips 016 are arranged at any one end of the outer tube 5, the middle part of each circular arc holding strip 016 is a circular arc section coaxial with the inner tube 4, and two ends of each circular arc section are straight-line sections 016.1 tangential to the circular arc sections;
the circular arc holding strip 016 is formed by bending a middle section by a straight line 16, as shown in fig. 4, a rubber strip embedded groove 18 is formed in one side of the middle section of the straight line 16 along the length direction, a straight line rubber strip 17 is embedded in the rubber strip embedded groove 18 along the length direction, the straight line rubber strip 17 is bonded with the groove bottom of the rubber strip embedded groove 18 through an adhesive, and after the middle section of the straight line 16 is bent, the straight line rubber strip 17 is changed into a circular arc rubber strip 017; the arc sections of the two arc holding strips 016 are symmetrically held tightly on the outer wall of the inner tube 4, the tail ends of the two straight line sections 016.1 of each arc holding strip 016 are welded with the end face of the outer tube 5, the arc rubber strips 017 on the inner side of the arc sections of the arc holding strips 016 are attached to the outer wall of the inner tube 4, pretension exists on the straight line sections 016.1 on the two ends of each arc holding strip 016, extrusion force is formed between the arc rubber strips 017 and the outer wall of the inner tube 4, and therefore elastic deformation occurs on each arc rubber strip 017 under extrusion of the outer wall of the inner tube 4; because each circular arc rubber strip 017 is elastically deformed under the extrusion of the outer wall of the inner tube 4, the stable extrusion force ensures the maximum static friction force between each circular arc rubber strip 017 and the outer wall of the inner tube 4, and the axial displacement between the inner tube 4 and the outer tube 5 is effectively avoided; and the coaxiality between the inner pipe 4 and the outer pipe 5 can be ensured all the time under the action of the two symmetrical arc holding strips 016; meanwhile, when the inner tube 4 passes through steam, the temperature of the inner tube 4 can rapidly rise, the outer tube 5 is directly contacted with the external cold environment, and heat preservation cotton is arranged between the inner tube 4 and the outer tube 5, so that a very large temperature difference can be generated between the inner tube 4 and the outer tube 5, at the moment, as the circular arc holding strips 016 are not directly welded on the inner tube 4, the outer diameter expansion of the inner tube 4 caused by temperature rise can further generate elastic deformation, and the circular arc rubber strips 017 can not be rigidly transmitted to the circular arc holding strips 016, so that the weld joints 6 at the two ends of the circular arc holding strips 016 are prevented from being cracked due to rigid tensile force, and the temperature difference resistance strength performance between the inner tube and the outer tube is further enhanced;
the welding process system for the inner pipe and the outer pipe of the steam heat-insulating pipe has the following required structure:
as shown in fig. 5 and 6, the steam heat-insulating pipe comprises an outer pipe placing seat 8, wherein the outer pipe placing seat 8 is provided with a horizontal outer pipe circular arc placing groove 7, and the middle section of the outer pipe 5 of the steam heat-insulating pipe is laid in the outer pipe circular arc placing groove 7 coaxially; front and rear sides of the outer tube placing seat 8 are respectively provided with a front welding auxiliary unit 1.1 and a rear welding auxiliary unit 1.2 which are symmetrical in structure front and rear; the front welding auxiliary unit 1.1 and the rear welding auxiliary unit 1.2 clamp the outer walls of the two ends of the inner tube 4 of the steam heat-insulating pipe respectively;
as in fig. 7 and 8; the front welding auxiliary unit 1.1 comprises an A rolling roller 22.1, a B rolling roller 22.2, a C rolling roller 22.3 and a D rolling roller 22.4; the rolling rollers A22.1 and B22.2 are bilaterally symmetrical to the upper side of the inner tube 4, and the rolling rollers C22.3 and D22.4 are bilaterally symmetrical to the lower side of the inner tube 4; two upper and lower horizontal straight lines 16 to be welded are also included; the lower surface of the middle section of the straight line 16 is tangent to the upper end of the inner tube 4, and the upper surface is tangent to the rolling roller A22.1 and the rolling roller B22.2 in a rolling way; the upper surface of the middle section of the other straight line bar 16 is tangent with the lower end of the inner tube 4, and the lower surface is tangent with the C rolling roller 22.3 and the D rolling roller 22.4 in a rolling way;
the rolling roller A22.1, the rolling roller B22.2, the rolling roller C22.3 and the rolling roller D22.4 can all move along a circular contour path under the axial view angle of the inner tube 4, so that the middle section of the straight line 16 is correspondingly bent and deformed along the circular contour path of the inner tube 4;
the end of the rolling roller A22.1, the rolling roller B22.2, the rolling roller C22.3 and the rolling roller D22.4, which are far away from the end face 5.1 of the outer tube 5, are provided with limiting outer edges 21 along the outline, so that the straight line bar 16 is clamped between the end face 5.1 of the outer tube 5 and each limiting outer edge 21;
the front welding auxiliary unit 1.1 further comprises a pair of guide rails 10 extending along the front-rear direction, a horizontal sliding block 9 capable of extending along the front-rear direction is arranged in the guide rails 10, the front welding auxiliary unit further comprises a translation cross beam 11, the translation cross beam 11 is fixed on the horizontal sliding block 9, and two ends of the translation cross beam 11 are fixed with left-right symmetrical vertical guide rails 15; an upper lifting beam 24.1 and a lower lifting beam 24.2 are respectively arranged between the two vertical guide rails 15; the two ends of the upper lifting cross beam 24.1 are respectively fixedly connected with A vertical sliding blocks 23.1 which are movably arranged in the two vertical guide rails 15; two ends of the lower lifting cross beam 24.2 are respectively fixedly connected with a B vertical sliding block 23.2 which is movably arranged in the two vertical guide rails 15; a vertical A lifter 12 is fixed in the middle of the translation beam 11, and the top end of an A lifting rod 13 of the A lifter 12 is fixedly connected with a lower lifting beam 24.2 through a connecting piece 14; a pair of B lifters 19 are fixed on the lower lifting cross beam 24.2, and the top ends of the B lifting rods 20 of the B lifters 19 are fixedly connected with the upper lifting cross beam 24.1;
the rolling roller A22.1, the rolling roller B22.2, the rolling roller C22.3 and the rolling roller D22.4 are respectively and rotatably arranged on the roller A seat 25.1, the roller B seat 25.2, the roller C seat 25.3 and the roller D seat 25.4 through bearings;
the left end and the right end of the upper lifting beam 24.1 are symmetrically and fixedly provided with an A telescopic device 26.1 and a B telescopic device 26.2 which extend along the length direction, and the tail end of an A telescopic rod 27.1 of the A telescopic device 26.1 and the tail end of a B telescopic rod 27.2 of the B telescopic device 26.2 are respectively and fixedly connected with an A roller seat 25.1 and a B roller seat 25.2;
the left end and the right end of the lower lifting cross beam 24.2 are symmetrically and fixedly provided with a C expansion device 26.3 and a D expansion device 26.4 which extend along the length direction, and the tail end of a C expansion rod 27.3 of the C expansion device 26.3 and the tail end of a D expansion rod 27.4 of the D expansion device 26.4 are respectively and fixedly connected with a C roller seat 25.3 and a D roller seat 25.4;
the specific process of the inner and outer pipe welding process system of the steam heat preservation pipe is as follows:
firstly, the inner tube 4, the outer tube 5 and the heat insulation cotton 3 between the inner tube 4 and the outer tube 5 are initially assembled to form a steam heat insulation tube whole 110, as the heat insulation cotton 3 is of a flexible structure, the part of the heat insulation cotton 3 is extruded for a long time along with the loss of time, so that the heat insulation effect is reduced, the relative displacement between the inner tube 4 and the outer tube 5 in the radial direction can occur due to the gravity factor in the long time, the coaxial degree of the inner tube 4 and the outer tube 5 can be gradually reduced, the heat insulation cotton 3 clamped between the inner tube 4 and the outer tube 5 is extruded locally, and the local compaction phenomenon of the heat insulation cotton is further caused, so that the heat is more easily transmitted to the outer tube 5 from the local extrusion part of the heat insulation cotton 3, and the whole heat insulation performance is further reduced; therefore, the inner tube 4 and the outer tube 5 need to be relatively fixed by a welding structure, and the inner tube 4 and the outer tube 5 are kept in a coaxial state;
step two, the middle section of the outer pipe 5 of the steam heat-insulating pipe whole 110 is laid in the outer pipe arc placing groove 7 coaxially, and then the front welding auxiliary unit 1.1 and the rear welding auxiliary unit 1.2 clamp the outer walls of the two ends of the inner pipe 4 of the steam heat-insulating pipe whole 110 respectively; because the front welding auxiliary unit 1.1 and the rear welding auxiliary unit 1.2 are of symmetrical structures, only the clamping state of one end of the inner tube 4 by the front welding auxiliary unit 1.1 is described in detail below;
as shown in fig. 6, 7 and 8, when the front welding auxiliary unit 1.1 performs an initial clamping state on one end of the inner tube 4, the a telescopic rod 27.1, the B telescopic rod 27.2, the C telescopic rod 27.3 and the D telescopic rod 27.4 are all in an extended state; the rolling roller A22.1 and the rolling roller B22.2 are in a mutually approaching state, and the rolling roller C22.3 and the rolling roller D22.4 are also in a mutually approaching state; at this time, the upper surface of the middle section of one straight line 16 waiting for welding is in rolling tangency with the A rolling roller 22.1 and the B rolling roller 22.2, the lower surface of the middle section of the other straight line 16 waiting for welding is in rolling tangency with the C rolling roller 22.3 and the D rolling roller 22.4, the inner pipe 4 is tightly clamped between the middle sections of the two horizontal straight lines 16, the middle sections of the two straight lines 16 are adaptively bent and attached to the upper and lower outer surfaces of the inner pipe 4 due to the jacking of the upper and lower ends of the inner pipe 4, at this time, one side, which is close to each other, of the two straight lines 16 is respectively provided with two straight line rubber strips 17, the middle parts of which are tightly attached to the upper and lower outer surfaces of the inner pipe 4, and are in a pressed state, so that one end of the inner pipe 4 is tightly clamped by the front welding auxiliary unit 1.1 is achieved; the other end of the inner tube 4 is tightly clamped by the rear welding auxiliary unit 1.2; and the inner tube 4 and the outer tube 5 which are clamped at the moment are just in a coaxial state;
step three, the lifting rod 13 is controlled to slowly extend, the lifting rod 20 is controlled to slowly retract, the retracting speed of the lifting rod 20 is doubled compared with the extending speed of the lifting rod 13, so that the upper lifting beam 24.1 and the lower lifting beam 24.2 move gradually close to each other at the same speed, simultaneously the lifting rod 27.1, the lifting rod 27.2, the lifting rod 27.3 and the lifting rod 27.4 are synchronously controlled to slowly retract, and under the combined action of the lifting rod 13, the lifting rod 20, the lifting rod 27.1, the lifting rod 27.2, the lifting rod 27.3 and the lifting rod 27.4, the rolling roller 22.1 and the rolling roller 22.2 gradually move away from each other along the circular outline path of the inner pipe 4 under the axial view, and the rolling roller 22.3 and the rolling roller 22.4 gradually move away from each other along the circular outline path of the inner pipe 4 under the axial view;
the middle sections of the two straight strips 16 are respectively bent and deformed to gradually enlarge the bending length along the circular contour path of the inner tube 4 under the rolling action of the rolling rollers A22.1 and B22.2 and the rolling rollers C22.3 and D22.4, so that the two straight strips 16 are symmetrically bent to form two circular arc holding strips 016 with the middle sections being circular arc sections, the two circular arc holding strips 016 are tightly held on the outer wall surface of the inner tube 4, the original straight rubber strips 17 on the two circular arc holding strips 016 are changed into circular arc rubber strips 017, and extrusion force is formed between the circular arc rubber strips 017 and the outer wall of the tightly held inner tube 4 to generate elastic deformation;
along with the continuous rolling of the rolling roller A22.1 and the rolling roller B22.2 and the rolling roller C22.3 and the rolling roller D22.4, the straight line segments 016.1 at the two ends of each circular arc holding bar 016 gradually move together, and when the tail ends of the straight line segments 016.1 at the two ends of the two circular arc holding bars 016 just move to be coincident with the end face 5.1 of the outer tube 5, the circular arc holding bars 016 are completely bent and formed, and then the lifting rod A13, the lifting rod B20, the telescopic rod A27.1, the telescopic rod B27.2, the telescopic rod C27.3 and the telescopic rod D27.4 are synchronously suspended; the rolling roller A22.1, the rolling roller B22.2, the rolling roller C22.3 and the rolling roller D22.4 are changed from a motion state to a static state at the same time, and at the moment, a state that extrusion force is formed between an arc rubber strip 017 on the arc holding strip 016 and the outer wall of the inner tube 4 which is tightly attached to the arc rubber strip 017 so as to generate elastic deformation is a holding state; as in fig. 9, 10, 11;
in the process of the step, the upper lifting cross beam 24.1 and the lower lifting cross beam 24.2 always do the movement of gradually approaching each other with the same speed, so that the inner tube 4 and the outer tube 5 are always in a coaxial state;
welding robot or manual work welds the superposition of the end of straight line segment 016.1 at two ends of each circular arc holding strip 016 and the end face 5.1 of the outer tube 5 to form a fixed welding seam 6'
Step five, after the weld joint 6 to be formed is cooled, the upper lifting cross beam 24.1 and the lower lifting cross beam 24.2 are controlled to be far away from each other, so that the A rolling roller 22.1 and the B rolling roller 22.2 as well as the C rolling roller 22.3 and the D rolling roller 22.4 are separated from two circular arc holding strips 016 which are welded on the end face of the outer tube 5 respectively;
after the rolling constraint of the A rolling roller 22.1, the B rolling roller 22.2, the C rolling roller 22.3 and the D rolling roller 22.4 is lost by the two circular arc holding strips 016, the circular arc rubber strips 017 which are in the extruded state on the two circular arc holding strips 016 have a trend of recovering to the free state, so that the circular arc rubber strips 017 form certain elastic expansion force on the middle part of the circular arc holding strips 016, the straight line sections 016.1 at the two ends of the circular arc holding strips 016 generate pretension, and the inner tube 4 and the outer tube 5 are tightly fixed relatively.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (6)
1. The steam heat-insulating pipe comprises a steam heat-insulating pipe, wherein the steam heat-insulating pipe comprises an inner pipe (4) and an outer pipe (5) which are coaxial, and heat-insulating cotton (3) is filled between the inner pipe (4) and the outer pipe (5);
the method is characterized in that: a pair of circular arc holding strips (016) are arranged at any one end of the outer tube (5), the middle part of each circular arc holding strip (016) is a circular arc section coaxial with the inner tube (4), and two ends of each circular arc section are straight line sections (016.1) tangent to the circular arc sections;
the arc holding strip (016) is formed by bending the middle section by a straight line strip (16); the arc sections of the two arc holding strips (016) are symmetrically held tightly on the outer wall of the inner tube (4), and the tail ends of the two straight line sections (016.1) of each arc holding strip (016) are welded with the end face (5.1) of the outer tube (5);
a rubber strip embedded groove (18) is formed in one side of the middle section of the straight strip (16) along the length direction, a straight rubber strip (17) is embedded in the rubber strip embedded groove (18) along the length direction, and after the middle section of the straight strip (16) is bent into an arc holding strip (016), the straight rubber strip (17) is changed into an arc rubber strip (017); and an arc rubber strip (017) at the inner side of the arc section of the arc holding strip (016) is attached to the outer wall of the inner pipe (4);
the straight line sections (016.1) at the two ends of each circular arc holding strip (016) have pretension, so that each circular arc rubber strip (017) is elastically deformed under the extrusion of the outer wall of the inner tube (4); when the inner tube (4) passes through steam, the outer diameter expansion of the inner tube (4) caused by temperature rise can further elastically deform each circular arc rubber strip (017).
2. A steam insulating pipe as claimed in claim 1, wherein: the linear rubber strip (17) is adhered to the bottom of the rubber strip embedded groove (18) through an adhesive.
3. The process system for welding an inner pipe and an outer pipe of a steam insulation pipe according to claim 1, wherein: the steam heat-insulating pipe comprises an outer pipe placing seat (8), wherein a horizontal outer pipe circular arc placing groove (7) is formed in the outer pipe placing seat (8), and the middle section of an outer pipe (5) of the steam heat-insulating pipe is laid in the outer pipe circular arc placing groove (7) coaxially; front and rear sides of the outer tube placing seat (8) are respectively provided with a front welding auxiliary unit (1.1) and a rear welding auxiliary unit (1.2) which are symmetrical in structure front and rear; the front welding auxiliary unit (1.1) and the rear welding auxiliary unit (1.2) clamp the outer walls of two ends of the inner tube (4) of the steam heat-insulating tube respectively;
the front welding auxiliary unit (1.1) comprises an A rolling roller (22.1), a B rolling roller (22.2), a C rolling roller (22.3) and a D rolling roller (22.4); the rolling rollers A (22.1) and B (22.2) are bilaterally symmetrical to the upper side of the inner tube (4), and the rolling rollers C (22.3) and D (22.4) are bilaterally symmetrical to the lower side of the inner tube (4); the welding machine also comprises two vertical and horizontal straight lines (16) to be welded; the lower surface of the middle section of the straight line bar (16) is tangential with the upper end of the inner tube (4), and the upper surface is tangential with the rolling roller A (22.1) and the rolling roller B (22.2); the upper surface of the middle section of the other straight line bar (16) is tangent with the lower end of the inner tube (4), and the lower surface is tangent with the C rolling roller (22.3) and the D rolling roller (22.4) in a rolling way; the rolling roller A (22.1), the rolling roller B (22.2), the rolling roller C (22.3) and the rolling roller D (22.4) can all move along a circular contour path of the inner tube (4) under the axial view angle, so that the middle section of the straight line (16) is correspondingly bent and deformed along the circular contour path of the inner tube (4).
4. A steam insulating pipe inner and outer pipe welding process system according to claim 3, wherein: one ends of the A rolling roller (22.1), the B rolling roller (22.2), the C rolling roller (22.3) and the D rolling roller (22.4), which are far away from the end face (5.1) of the outer tube (5), are provided with limiting outer edges (21) along the outline, so that the straight line (16) is clamped between the end face (5.1) of the outer tube (5) and each limiting outer edge (21).
5. The specific process of the inner and outer pipe welding process system of the steam insulation pipe according to claim 4, wherein the specific process is characterized in that:
firstly, performing preliminary assembly on an inner pipe (4), an outer pipe (5) and heat preservation cotton (3);
step two, the middle section of the outer pipe (5) of the steam heat-insulating pipe whole (110) is laid in the outer pipe arc placing groove (7) coaxially, and then the front welding auxiliary unit (1.1) and the rear welding auxiliary unit (1.2) clamp the outer walls of the two ends of the inner pipe (4) of the steam heat-insulating pipe whole (110) respectively;
step three, rolling motion of gradually keeping away from each other is carried out on the A rolling roller (22.1) and the B rolling roller (22.2) along the circular contour path of the inner tube (4) under the axial view angle, rolling motion of gradually keeping away from each other is carried out on the C rolling roller (22.3) and the D rolling roller (22.4) along the circular contour path of the inner tube (4) under the axial view angle, the middle sections of the two straight lines (16) are bent and deformed gradually with the bending length being gradually increased along the circular contour path of the inner tube (4), so that the two straight lines (16) are bent symmetrically to form arc holding strips (016) with the two middle sections being arc sections, the two arc holding strips (016) are tightly held tightly on the outer wall surface of the inner tube (4), the original linear rubber strips (17) on the two arc holding strips (016) are changed into arc rubber strips (017), and extrusion forces are formed between the arc rubber strips (017) and the outer wall of the tightly attached inner tube (4) so as to generate elastic deformation; when the tail ends of straight line sections (016.1) at the two ends of the arc holding strips (016) just move to be coincident with the end face (5.1) of the outer tube (5), the A rolling roller (22.1), the B rolling roller (22.2), the C rolling roller (22.3) and the D rolling roller (22.4) are changed from a moving state to a static state at the same time, and at the moment, an extrusion force is formed between an arc rubber strip (017) on the arc holding strips (016) and the outer wall of the inner tube (4) which is tightly abutted to form an elastic deformation state to be a holding state;
and fourthly, welding the superposition of the tail ends of the straight line sections (016.1) at the two ends of each arc holding strip (016) and the end face (5.1) of the outer tube (5) by a welding robot or manually, and forming a fixed welding seam (6).
6. The specific process of the inner and outer pipe welding process system of the steam insulation pipe according to claim 5, wherein the specific process is characterized in that: step five, after the weld joint (6) to be formed is cooled, the rolling roller A (22.1) and the rolling roller B (22.2) and the rolling roller C (22.3) and the rolling roller D (22.4) are separated from two circular arc holding strips (016) which are welded on the end face of the outer tube (5) respectively; after the rolling constraint of the A rolling roller (22.1) and the B rolling roller (22.2) and the C rolling roller (22.3) and the D rolling roller (22.4) is lost, the two circular arc holding strips (016) have a trend of recovering to a free state when the circular arc rubber strips (017) in an extruded state are arranged on the two circular arc holding strips (016), so that the circular arc rubber strips (017) form a certain elastic expansion force on the middle part of the circular arc holding strips (016), and the straight line sections (016.1) at the two ends of the circular arc holding strips (016) generate pretension.
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| CN202211008057.7A CN115430970B (en) | 2022-08-22 | 2022-08-22 | Steam heat-insulating pipe and inner and outer pipe welding process system of heat-insulating pipe |
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| CN202211008057.7A CN115430970B (en) | 2022-08-22 | 2022-08-22 | Steam heat-insulating pipe and inner and outer pipe welding process system of heat-insulating pipe |
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| CN115430970B true CN115430970B (en) | 2023-11-17 |
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| KR102414060B1 (en) * | 2021-04-23 | 2022-06-27 | 김성용 | Embedded steam transfer pipe |
| CN115283873A (en) * | 2022-08-18 | 2022-11-04 | 江苏恒宇管业科技有限公司 | Welding process system for inner and outer tubes of steam heat-insulating tube and coaxial retainer and retainer |
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| JP2004169741A (en) * | 2002-11-18 | 2004-06-17 | Kubota Corp | Inner pipe holding device for heat insulation double pipe |
| KR20140043611A (en) * | 2012-10-02 | 2014-04-10 | 주식회사 이듄시스템 | Dual pipe with strain compensation device |
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| CN115430970A (en) | 2022-12-06 |
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