CN109317938B - Continuous bending manufacturing process for heat exchange tube with snakelike helical fins - Google Patents
Continuous bending manufacturing process for heat exchange tube with snakelike helical fins Download PDFInfo
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- CN109317938B CN109317938B CN201811049766.3A CN201811049766A CN109317938B CN 109317938 B CN109317938 B CN 109317938B CN 201811049766 A CN201811049766 A CN 201811049766A CN 109317938 B CN109317938 B CN 109317938B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
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- Mechanical Engineering (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a continuous bending manufacturing process of a snakelike helical fin heat exchange tube, which comprises the following process steps: (1) producing a finned tube to be bent on a high-frequency welding spiral finned tube welding machine, wherein spiral fins on the finned tube to be bent are formed by spirally winding a steel strip, and spiral fins on the finned tube to be bent are formed by alternately arranging a plurality of welding fin sections and a plurality of cold-wound fin sections in turn; (2) all cold-wound spiral fins on the finned tube to be bent are completely disassembled; (3) and bending the finned tubes to be bent into coiled tubes by bending the tube bodies at the cold-wound fin sections on the tube bending machine, so as to manufacture the coiled spiral fin heat exchange tubes. The manufacturing process abandons the original welding production process and uses the continuous bending of the finned tube to be bent after the cold winding of the helical fin is disassembled to manufacture the snakelike helical fin heat exchange tube, thereby greatly improving the production efficiency, reducing the production cost, and improving the quality of the heat exchange tube without welding seams between tube bodies.
Description
Technical Field
The invention relates to the field of heat exchange tube manufacturing, in particular to a continuous bending manufacturing process of a snakelike spiral fin heat exchange tube.
Background
The snakelike spiral fin heat exchange tube is a snakelike bent spiral fin heat exchange tube, spiral fins are arranged on straight tube sections of the heat exchange tube, and the bent tube sections are light tubes without fins. At present, the process of welding the bent sections and the straight sections is commonly adopted to connect all the straight sections and all the bent sections in turn and alternately to form the snakelike helical fin heat exchange tube. The serpentine spiral fin heat exchange tube produced by adopting the welding process has the defects of low production efficiency, easy leakage at the welding position, high production cost, long manufacturing period and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the continuous bending manufacturing process of the snakelike spiral fin heat exchange tube has the advantages of high production efficiency, low production cost, high product quality and short manufacturing period.
In order to solve the problems, the technical scheme adopted by the invention is as follows: the continuous bending manufacturing process of the serpentine spiral fin heat exchange tube is characterized in that: the process comprises the following steps:
(1) the method comprises the steps that a finned tube to be bent is produced on a high-frequency welding spiral finned tube welding machine, spiral fins on the finned tube to be bent are formed by spirally winding a steel strip, welding modules in the high-frequency welding spiral finned tube welding machine are powered on and off alternately in the spiral winding process of the steel strip, so that spiral fins on the finned tube to be bent are formed by alternately arranging a plurality of welding fin sections and a plurality of cold-wound fin sections in sequence, wherein the welding fin sections correspond to straight tube sections of a snake-shaped spiral finned heat exchange tube, the cold-wound fin sections correspond to bent tube sections of the snake-shaped spiral finned heat exchange tube, the spiral fins are welded on the outer side of the straight tube through high-frequency welding when the welding modules are powered on, and the cold-wound fin sections are formed by cold-winding the outer side of the;
(2) completely disassembling cold-wound spiral fins on each cold-wound fin section on the finned tube to be bent;
(3) and bending the finned tube to be bent into a coiled tube by bending the straight tube at each cold-wound finned section on the die opening and closing tube bending machine according to the requirement of the coiled tube, thereby manufacturing the coiled spiral finned heat exchange tube.
Further, the serpentine spiral fin heat exchange tube continuous bending manufacturing process includes: cold winding helical fins on the finned tube to be bent are disassembled on the fin disassembling device, and the structure of the fin disassembling device comprises: the frame is provided with the support that can hold in the palm the finned tube that waits to bend that lies down in the frame and hold the device to the finned tube that waits to bend can also be on holding the device rotation, still includes: the hook with the pull rope can be hooked on the fracture end of the cold winding spiral fin after the finned tube to be bent is placed on the supporting device, the rack is further provided with a pull-down driving device which can drive the hook to pull downwards through the pull rope, after the hook is driven to pull downwards, the cold winding spiral fin hooked on the fracture end can be pulled by the hook to be detached from the finned tube to be bent, and the finned tube to be bent can be pulled by the hook to rotate on the supporting device in the process.
Further, the serpentine spiral fin heat exchange tube continuous bending manufacturing process includes: the structure of the supporting device is as follows: be provided with the support unit that the several was arranged at interval side by side in the frame, every structure that holds the unit all includes: the two rollers can support the finned tube to be bent placed between the two rollers, and when the finned tube to be bent is pulled to rotate, the two rollers can be driven by the finned tube to be bent to rotate together.
Further, the serpentine spiral fin heat exchange tube continuous bending manufacturing process includes: the mounting frame is provided with a U-shaped clamping block, and the mounting frame is downwards clamped outside a cross beam of the rack through the U-shaped clamping block and is mounted on the rack.
Further, the serpentine spiral fin heat exchange tube continuous bending manufacturing process includes: the structure of the pull-down driving device comprises: the rotary main shaft is arranged on the rack through a bearing, the rotary main shaft is positioned below the supporting device, one end of the pull rope of the hook is fixed with the shaft body of the rotary main shaft, the rack is also provided with a rotary driving device capable of driving the rotary main shaft to rotate, and after the rotary main shaft rotates, the pull rope can be wound on the rotary main shaft, so that the hook on the other end of the pull rope can be driven to pull downwards.
Further, the serpentine spiral fin heat exchange tube continuous bending manufacturing process includes: a placing frame used for placing the finned tube to be bent after the cold winding helical fin is disassembled is arranged in front of the supporting device, and a transferring device capable of transferring the finned tube to be bent on the supporting device to the placing frame is arranged between the supporting device and the placing frame.
Further, the serpentine spiral fin heat exchange tube continuous bending manufacturing process includes: the structure of the transfer device is as follows: the rack is at least provided with two supporting plates which incline downwards from back to front, the rack below each supporting plate is also respectively provided with a supporting plate lifting device which can drive the supporting plate to lift, each supporting plate can support the finned tube to be bent on the supporting device after moving upwards, the finned tube to be bent can roll forwards and leave the supporting device, the rear part of the rack is at least provided with two transfer inclined rods which can receive the finned tube to be bent and incline downwards from back to front, the finned tube to be bent rolls forwards and leaves the supporting device and then can fall to the rear end of each transfer inclined rod, and the finned tube to be bent can roll forwards to the rack along each transfer inclined rod.
Further, the serpentine spiral fin heat exchange tube continuous bending manufacturing process includes: the front end of each transfer diagonal rod is respectively provided with a rotating shaft, the placing frame is provided with a shaft sleeve for the rotating shafts to be inserted downwards one by one, and the rotating shafts at the front ends of the transfer diagonal rods can be installed on the placing frame in a self-rotating mode after being inserted downwards into the shaft sleeves.
Further, the serpentine spiral fin heat exchange tube continuous bending manufacturing process includes: the rack is also provided with at least two blocking rods which are detachably arranged, each blocking rod is positioned in front of the supporting device, and each blocking rod can prevent the finned tube to be bent from being separated from the supporting device by blocking the finned tube to be bent from moving forwards.
Further, the serpentine spiral fin heat exchange tube continuous bending manufacturing process includes: the fin removing method adopting the fin removing device comprises the following steps:
(1) cutting off the cold-wound helical fins on the finned tube to be bent and the high-frequency welding helical fins at each joint by using a cutter, and cutting off the cold-wound helical fins on each cold-wound fin section from the middle part, so that the cold-wound helical fins on each cold-wound fin section are divided into two sections;
(2) the finned tube to be bent is horizontally placed on the supporting device, and then the hooks are respectively hooked on the fracture end on one side of one section of cold-wound helical fin in each cold-wound fin section one by one; the cold-wound spiral fins of all sections of the hooked body are positioned on the same side, and the cut ends of all sections of the hooked body are also positioned on the same side;
(3) each hook is driven to pull downwards through a pull-down driving device, so that one section of cold-wound helical fin in each cold-wound fin segment is firstly detached;
(4) respectively hooking the hooks on one fracture end on one side of the remaining section of the cold-wound spiral fin in each cold-wound fin section one by one; each fracture end of the hooked body is positioned on the same side;
(5) and driving each hook to pull downwards through a pull-down driving device, so that the rest section of the cold-wound spiral fin in each cold-wound fin section is detached.
The invention has the advantages that: the continuous bending manufacturing process of the serpentine helical fin heat exchange tube abandons the original welding production mode, and adopts continuous bending to the finned tube to be bent after the cold-wound helical fin is disassembled to manufacture the serpentine helical fin heat exchange tube, so that the production efficiency is greatly improved, the production cost is reduced, the manufacturing period is shortened, the quality of the heat exchange tube is improved due to no welding seam between tube bodies, and the operation of a heat exchange system can be improved due to the heat exchange tube without the welding seam; in addition, the fin dismounting device downwards pulls the cold-winding helical fin through the hook to enable the to-be-bent finned tube to rotate to dismount the cold-winding helical fin, so that the cold-winding helical fin on the to-be-bent finned tube can be quickly dismounted, the to-be-bent finned tube can be automatically transferred to the placing frame after the cold-winding helical fin is dismounted, the labor intensity of workers can be greatly reduced, and the production efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of a fin removing device according to the present invention.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and the attached drawings.
The process for manufacturing the serpentine spiral fin heat exchange tube by continuous bending comprises the following process steps:
(1) the method is characterized in that a to-be-bent finned tube is produced on a high-frequency welding spiral finned tube welding machine, the high-frequency welding spiral finned tube welding machine is directly available existing equipment for producing a spiral finned tube, spiral fins on the to-be-bent finned tube are formed by spirally winding a steel strip, in addition, the welding modules in the high-frequency welding spiral finned tube welding machine are alternately powered on and off in the steel strip spiral winding process, so that spiral fins on the to-be-bent finned tube in the embodiment are formed by mutually and sequentially and alternately arranging three welding fin segments and two cold winding fin segments, wherein the welding fin segments correspond to straight tube segments of a snakelike spiral finned heat exchange tube, the cold winding fin segments correspond to bent tube segments of the snakelike spiral finned heat exchange tube, the spiral fins formed by winding the steel strip when the welding modules are powered on are welded on the outer side of the straight tube through high-frequency welding, and the cold winding of the spiral fins formed by winding the steel strip in Side by side;
(2) the cold-wound spiral fins on the two cold-wound fin sections on the finned tube to be bent are completely dismounted on the fin dismounting device;
(3) and bending the finned tube to be bent into a coiled tube by bending the straight tubes at the two cold-wound finned sections on the die opening and closing tube bending machine according to the requirement of the coiled tube so as to manufacture the coiled spiral finned heat exchange tube.
As shown in fig. 1, in the present embodiment, the structure of the fin removing device includes: frame 1 is provided with the support that can hold in the palm the finned tube 9 that waits to bend that lies down and holds the device in frame 1 to the finned tube 9 that waits to bend can also be on holding the device rotation, still includes: after the finned tube 9 to be bent is placed on the supporting device, the two hooks 2 can be respectively hooked on fracture ends of the cold-wound helical fins 12 close to the fracture ends, the fracture ends of the cold-wound helical fins 12 are obtained by cutting off the cold-wound helical fins 12 by a cutter in advance by workers, and in order to disassemble the cold-wound helical fins 12, the joints of the cold-wound helical fins 12 and the high-frequency welding helical fins 11 need to be cut off in advance; the rack 1 is also provided with a pull-down driving device which can drive the hooks 2 to pull downwards through the pull ropes 21, after the two hooks 2 are driven to pull downwards, the two cold-wound spiral fins 12 hooked at the fracture ends can be pulled by the corresponding hooks 2 to be detached from the finned tube 9 to be bent, and in the process, the finned tube 9 to be bent can be pulled by the hooks 2 to rotate on the supporting device.
In this embodiment, the fin removing step using the fin removing device is as follows:
(1) cutting off the cold-wound helical fins 12 on the finned tube 9 to be bent and the high-frequency welding helical fins 11 at the joints by using a cutter, and cutting off the cold-wound helical fins 12 on the cold-wound fin sections from the middle part, so that the cold-wound helical fins 12 on the cold-wound fin sections are divided into two sections;
(2) the finned tube 9 to be bent is horizontally placed on the supporting device, and then the two hooks 2 are respectively hooked on the right fracture end of the left section of the cold-wound helical fin in the two cold-wound fin sections one by one;
(3) the two hooks 2 are driven by the pull-down driving device to pull downwards, so that the section of the cold-wound spiral fin on the left side in the two cold-wound fin sections is firstly detached;
(4) the two hooks 2 are respectively hooked on the left fracture end of the left cold-wound spiral fin on the left section of the left cold-wound spiral fin in the two cold-wound fin sections one by one;
(5) and each hook 2 is driven by a pull-down driving device to pull downwards, so that the section on the right side of the two cold-wound fin sections is detached.
The fracture end to be hooked by the hook can be detached in advance by adopting a tool, so that the hook can be conveniently and reliably hooked.
In this embodiment, the structure of the holding device is: be provided with four side by side interval arrangement's support unit 3 in frame 1, every structure that supports unit 3 all includes: a mounting frame 31 mounted on the frame 1, in this embodiment, the mounting frame 31 is provided with a U-shaped clamping block 33, and the mounting frame 31 is mounted on the frame 1 by clamping the U-shaped clamping block 33 downwards to the outer side of the cross beam of the frame 1, so as to conveniently move the holding unit 3 to stagger the cold-wound helical fins 12; two rollers 32 are arranged on the mounting rack 31, the two rollers 32 can hold the finned tube 9 to be bent placed between the two rollers 32, and when the finned tube 9 to be bent is pulled to rotate, the two rollers 32 can be carried by the finned tube 9 to be bent to rotate together.
In this embodiment, the structure of the pull-down driving apparatus includes: the rotating main shaft 4 is arranged on the frame 1 through a bearing, the rotating main shaft 4 is positioned below the supporting device, one end of the pull rope 21 of the hook 2 is fixed with the shaft body of the rotating main shaft 4, the frame 1 is also provided with a rotating driving device 41 capable of driving the rotating main shaft 4 to rotate, and in the embodiment, the rotating driving device 41 is a speed reducing motor; after the rotating main shaft 4 rotates, the pulling rope 21 is wound on the rotating main shaft 4, so that the hook 2 on the other end of the pulling rope 21 is driven to pull downwards.
In this embodiment, a placing rack 5 for placing the finned tube 9 to be bent after the cold-rolled helical fins 12 are removed is further provided in front of the holding device, and a transfer device capable of transferring the finned tube 9 to be bent on the holding device to the placing rack 5 is provided between the holding device and the placing rack 5. The structure of the transfer device is as follows: the frame 1 is provided with three support plates 6 inclined from back to front and downwards, the frame 1 below each support plate 6 is also provided with a support plate lifting device 61 capable of driving the support plate 6 to lift, in the embodiment, the support plate lifting device 61 is a cylinder; after moving upwards, each supporting plate 6 can support the finned tube 9 to be bent on the supporting device, and can enable the finned tube 9 to be bent to roll forwards to leave the supporting device, four transfer inclined rods 51 which can receive the finned tube 9 to be bent and incline downwards from back to front are arranged at the rear part of the placing frame 5, the finned tube 9 to be bent can roll forwards to leave the supporting device and then can fall onto the rear end of each transfer inclined rod 51, and the finned tube 9 to be bent can roll forwards to the placing frame 5 along each transfer inclined rod 51.
In this embodiment, a rotating shaft 52 is provided at the front end of each transfer diagonal rod 51, a pair of bushings 53 into which the rotating shafts 52 are inserted downward are provided on the rack 5, and the rotating shaft 52 at the front end of the transfer diagonal rod 51 is inserted downward into the bushings 53 and then the transfer diagonal rod 51 is rotatably mounted on the rack 5. After the transfer diagonal member 51 is provided to be rotatable, a worker can dial the transfer diagonal member 51 to a side not obstructing the work when the transfer diagonal member 51 is not used, thereby improving the working efficiency.
In this embodiment, two blocking rods 7 which are detachably mounted are further arranged on the frame 1, each blocking rod 7 is positioned in front of the supporting device, and each blocking rod 7 can prevent the finned tube 9 to be bent from being separated from the supporting device by blocking the finned tube 9 to be bent from moving forwards. When the cold-wound spiral fin 12 is disassembled, two blocking rods 7 are required to be installed on the rack 1, so that the situation that the finned tube 9 to be bent is separated from the supporting device in the disassembling process is prevented, and after the cold-wound spiral fin 12 is disassembled, the two blocking rods 7 are required to be disassembled from the rack 1, so that the finned tube 9 to be bent is not prevented from leaving the supporting device.
Claims (10)
1. The continuous bending manufacturing process of the serpentine spiral fin heat exchange tube is characterized in that: the process comprises the following steps:
(1) the method comprises the steps that a finned tube to be bent is produced on a high-frequency welding spiral finned tube welding machine, spiral fins on the finned tube to be bent are formed by spirally winding a steel strip, welding modules in the high-frequency welding spiral finned tube welding machine are powered on and off alternately in the spiral winding process of the steel strip, so that spiral fins on the finned tube to be bent are formed by alternately arranging a plurality of welding fin sections and a plurality of cold-wound fin sections in sequence, wherein the welding fin sections correspond to straight tube sections of a snake-shaped spiral finned heat exchange tube, the cold-wound fin sections correspond to bent tube sections of the snake-shaped spiral finned heat exchange tube, the spiral fins are welded on the outer side of the straight tube through high-frequency welding when the welding modules are powered on, and the cold-wound fin sections are formed by cold-winding the outer side of the;
(2) completely disassembling cold-wound spiral fins on each cold-wound fin section on the finned tube to be bent;
(3) and bending the finned tube to be bent into a coiled tube by bending the straight tube at each cold-wound finned section on the die opening and closing tube bending machine according to the requirement of the coiled tube, thereby manufacturing the coiled spiral finned heat exchange tube.
2. The continuous bending manufacturing process of the serpentine spiral fin heat exchange tube according to claim 1, wherein: cold winding helical fins on the finned tube to be bent are disassembled on the fin disassembling device, and the structure of the fin disassembling device comprises: the frame is provided with the support that can hold in the palm the finned tube that waits to bend that lies down in the frame and hold the device to the finned tube that waits to bend can also be on holding the device rotation, still includes: the hook with the pull rope can be hooked on the fracture end of the cold winding spiral fin after the finned tube to be bent is placed on the supporting device, the rack is further provided with a pull-down driving device which can drive the hook to pull downwards through the pull rope, after the hook is driven to pull downwards, the cold winding spiral fin hooked on the fracture end can be pulled by the hook to be detached from the finned tube to be bent, and the finned tube to be bent can be pulled by the hook to rotate on the supporting device in the process.
3. The continuous bending manufacturing process of the serpentine spiral fin heat exchange tube as claimed in claim 2, wherein: the structure of the supporting device is as follows: be provided with the support unit that the several was arranged at interval side by side in the frame, every structure that holds the unit all includes: the two rollers can support the finned tube to be bent placed between the two rollers, and when the finned tube to be bent is pulled to rotate, the two rollers can be driven by the finned tube to be bent to rotate together.
4. The continuous bending manufacturing process of the serpentine spiral fin heat exchange tube according to claim 3, wherein: the mounting frame is provided with a U-shaped clamping block, and the mounting frame is downwards clamped outside a cross beam of the rack through the U-shaped clamping block and is mounted on the rack.
5. The continuous bending manufacturing process of the serpentine spiral finned heat exchange tube according to claim 2, 3 or 4, wherein: the structure of the pull-down driving device comprises: the rotary main shaft is arranged on the rack through a bearing, the rotary main shaft is positioned below the supporting device, one end of the pull rope of the hook is fixed with the shaft body of the rotary main shaft, the rack is also provided with a rotary driving device capable of driving the rotary main shaft to rotate, and after the rotary main shaft rotates, the pull rope can be wound on the rotary main shaft, so that the hook on the other end of the pull rope can be driven to pull downwards.
6. The continuous bending manufacturing process of the serpentine spiral finned heat exchange tube according to claim 2, 3 or 4, wherein: a placing frame used for placing the finned tube to be bent after the cold winding helical fin is disassembled is arranged in front of the supporting device, and a transferring device capable of transferring the finned tube to be bent on the supporting device to the placing frame is arranged between the supporting device and the placing frame.
7. The continuous bending manufacturing process of the serpentine spiral fin heat exchange tube as claimed in claim 6, wherein: the structure of the transfer device is as follows: the rack is at least provided with two supporting plates which incline downwards from back to front, the rack below each supporting plate is also respectively provided with a supporting plate lifting device which can drive the supporting plate to lift, each supporting plate can support the finned tube to be bent on the supporting device after moving upwards, the finned tube to be bent can roll forwards and leave the supporting device, the rear part of the rack is at least provided with two transfer inclined rods which can receive the finned tube to be bent and incline downwards from back to front, the finned tube to be bent rolls forwards and leaves the supporting device and then can fall to the rear end of each transfer inclined rod, and the finned tube to be bent can roll forwards to the rack along each transfer inclined rod.
8. The continuous bending manufacturing process of the serpentine spiral fin heat exchange tube according to claim 7, wherein: the front end of each transfer diagonal rod is respectively provided with a rotating shaft, the placing frame is provided with a shaft sleeve for the rotating shafts to be inserted downwards one by one, and the rotating shafts at the front ends of the transfer diagonal rods can be installed on the placing frame in a self-rotating mode after being inserted downwards into the shaft sleeves.
9. The continuous bending manufacturing process of the serpentine spiral finned heat exchange tube according to claim 2, 3 or 4, wherein: the rack is also provided with at least two blocking rods which are detachably arranged, each blocking rod is positioned in front of the supporting device, and each blocking rod can prevent the finned tube to be bent from being separated from the supporting device by blocking the finned tube to be bent from moving forwards.
10. The continuous bending manufacturing process of the serpentine spiral fin heat exchange tube as claimed in claim 2, wherein: the fin removing method adopting the fin removing device comprises the following steps:
(1) cutting off the cold-wound helical fins on the finned tube to be bent and the high-frequency welding helical fins at each joint by using a cutter, and cutting off the cold-wound helical fins on each cold-wound fin section from the middle part, so that the cold-wound helical fins on each cold-wound fin section are divided into two sections;
(2) the finned tube to be bent is horizontally placed on the supporting device, and then the hooks are respectively hooked on the fracture end on one side of one section of cold-wound helical fin in each cold-wound fin section one by one; the cold-wound spiral fins of all sections of the hooked body are positioned on the same side, and the cut ends of all sections of the hooked body are also positioned on the same side;
(3) each hook is driven to pull downwards through a pull-down driving device, so that one section of cold-wound helical fin in each cold-wound fin segment is firstly detached;
(4) respectively hooking the hooks on one fracture end on one side of the remaining section of the cold-wound spiral fin in each cold-wound fin section one by one; each fracture end of the hooked body is positioned on the same side;
(5) and driving each hook to pull downwards through a pull-down driving device, so that the rest section of the cold-wound spiral fin in each cold-wound fin section is detached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811049766.3A CN109317938B (en) | 2018-09-10 | 2018-09-10 | Continuous bending manufacturing process for heat exchange tube with snakelike helical fins |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811049766.3A CN109317938B (en) | 2018-09-10 | 2018-09-10 | Continuous bending manufacturing process for heat exchange tube with snakelike helical fins |
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| CN109317938A CN109317938A (en) | 2019-02-12 |
| CN109317938B true CN109317938B (en) | 2020-11-27 |
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| CN110666009B (en) * | 2019-09-29 | 2024-03-05 | 张家港市昆仑管业有限公司 | Big R bending machine of U type heat exchange tube |
| CN112621142B (en) * | 2020-12-01 | 2022-06-21 | 江苏东南环保科技有限公司 | Heat exchanger fin forming processing method |
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| CN109317938A (en) | 2019-02-12 |
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