CN113020745A - Device and method for buckling brazing filler metal on pipe body - Google Patents
Device and method for buckling brazing filler metal on pipe body Download PDFInfo
- Publication number
- CN113020745A CN113020745A CN202110326729.8A CN202110326729A CN113020745A CN 113020745 A CN113020745 A CN 113020745A CN 202110326729 A CN202110326729 A CN 202110326729A CN 113020745 A CN113020745 A CN 113020745A
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- CN
- China
- Prior art keywords
- material belt
- filler metal
- pipe body
- buckling
- brazing filler
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Classifications
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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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/06—Solder feeding devices; Solder melting pans
- B23K3/0607—Solder feeding devices
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shearing Machines (AREA)
Abstract
A device and a method for buckling brazing filler metal on a pipe body are provided, the device comprises: the material tray is used for winding the material belt; the guide groove is used for guiding the material belt on the material disc to the side of the first lifting clamping mechanism; the first lifting clamping mechanism is used for grabbing the material belt and driving the material belt to move up and down; the cutting mechanism is used for cutting the material belt moved to the target position; the second lifting clamping mechanism is used for moving the cut material belt to the buckling mechanism; and the buckling mechanism is used for buckling the cut material belt on the pipe body to be fixed. The invention also discloses a method for buckling the brazing filler metal on the pipe body. The invention has simple and compact structure, small occupied area, and automatic completion of a series of operations, thereby greatly improving the working efficiency and reducing the reject ratio.
Description
Technical Field
The invention relates to pipe body processing equipment, in particular to a device and a method for buckling brazing filler metal on a pipe body.
Background
The brazing technology of current body, it is good according to the position equipment of regulation before going into the stove usually, common self-holding assembly method is including the turn-ups location, gravity positioning, interference fit and press fit, the annular knurl, the flaring, binding off etc, however this kind is to the turn-ups of work piece, location and cooperation etc. not to the improvement of brazing filler metal, for example the pipe sets up the turn-ups on the pipe usually with the joint locate mode of board, set up brazing filler metal between turn-ups and the board and braze welding and be connected, the turn-ups setting of body can be hugged closely to the brazing filler metal, brazing filler metal this moment only plays the connection effect, and not limiting displacement.
And the connection between current brazing filler metal and the body, manual operation usually, the manual work is cut off the brazing filler metal promptly, connects it in the tip of body and fixed, then places the stove of brazing in and brazes, and this kind of mode is wasted time and energy, only is applicable to being connected between a small amount of body and the plate body, if the body has when a plurality of, can greatly increased intensity of labour, and work efficiency is extremely low.
Therefore, the present invention is directed to a device for connecting a tube body with a brazing material, which is capable of cutting a material tape, fastening a brazing material ring to the tube body, then transporting the tube body with the brazing material to a target position to pre-fix the tube body with other components, and finally brazing the tube body in a furnace.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a device and a method for buckling brazing filler metal for a pipe body, which have the advantages of compact structure, high working efficiency and high qualification rate.
The technical scheme of the invention is as follows:
the invention relates to a pipe body brazing filler metal buckling device, which comprises:
the material tray is used for winding the material belt;
the guide groove is used for guiding the material belt on the material disc to the side of the first lifting clamping mechanism;
the first lifting clamping mechanism is used for grabbing the material belt and driving the material belt to move up and down;
the cutting mechanism is used for cutting the material belt moved to the target position;
the second lifting clamping mechanism is used for moving the cut material belt to the buckling mechanism;
and the buckling mechanism is used for buckling the cut material belt on the pipe body to be fixed.
Furthermore, the material belt comprises a plurality of integrally connected brazing filler metal rings, and each brazing filler metal ring comprises a protrusion extending out along the hole and a wrenching edge arranged at the edge of the brazing filler metal ring; the buckling mechanism inserts the bulges of the cut brazing filler metal rings into the pipe body and buckles the pull edge on the pipe body in a bending mode.
Furthermore, the guide groove comprises at least one obliquely arranged channel, a closed notch is formed in the channel, the material belt can penetrate from the starting end of the closed notch, and the tail end of the material belt penetrates out of the closed notch.
Furthermore, the rear end of the guide groove is connected with a guide plate, a positioning mechanism is arranged on the side of the guide plate, and a cutting mechanism is arranged above the positioning mechanism.
Furthermore, the guide plate is provided with a positioning hole at a position corresponding to the positioning mechanism, and the positioning mechanism can extend out of the positioning hole and be inserted into the brazing ring of the material belt for positioning.
Furthermore, the guide plate is provided with a long hole at a position corresponding to the first lifting clamping mechanism, so that the first lifting clamping mechanism penetrates through the long hole to grab the material belt and drive the material belt to move.
Further, a pipe body conveying mechanism is arranged on one side of the buckling mechanism, and the second lifting mechanism is located between the buckling mechanism and the pipe body conveying mechanism; the buckling mechanism comprises a horizontal moving part used for inserting the projection of the cut brazing filler metal ring into the pipe body and a pulling edge buckling part used for buckling the pulling edge of the brazing filler metal ring on the pipe body.
Further, be equipped with between charging tray and the guide way and take inductive sensor for whether detect the material and take the material and whether pull tightly, the material area passes through from the below of taking inductive sensor.
The invention relates to a method for buckling brazing filler metal on a pipe body, which comprises the following steps:
s1: leading out and positioning the wound material belt;
s2: driving the material belt to move to a target position for cutting, so that the single brazing ring on the material belt is separated from the material belt;
s3: the brazing filler metal that breaks away from encloses to the body side, inserts the arch of brazing filler metal circle to the body in to buckle the limit of pulling of brazing filler metal circle the border of lock at the body, accomplish the fixed of brazing filler metal circle.
Further, in S1, detecting whether the tape is loaded in real time after the wound tape is drawn out, and if no tape is loaded, prompting loading; and detecting whether the material belt is tensioned, and controlling the material disc to rotate to enable the material belt to keep a loose state if the material belt is tensioned.
The invention has the beneficial effects that:
(1) by arranging the guide groove which comprises the obliquely arranged channel, the path of the material belt can be guided, the stability of the material belt is ensured, and other mechanisms can be arranged on the back of the guide groove, so that the whole structure is compact, and the occupied area is small;
(2) the material ring extending out of the guide groove can be driven to move by arranging the first lifting clamping mechanism, the cutting mechanism and the second lifting clamping mechanism, the material ring is moved to the side of the cutting mechanism to be cut off, the cut brazing filler metal ring is clamped by the second lifting clamping mechanism and is sent into the buckling mechanism, the movement and cutting of the material belt and the conveying of the brazing filler metal ring are completed through continuous operation, the intelligent operation is realized, the structure is simple and compact, and the working efficiency is high;
(3) by arranging the positioning mechanism, the material belt can be prevented from shaking during cutting, and the cutting stability is greatly improved;
(4) by arranging the buckling mechanism, the brazing filler metal ring can be buckled on the pipe body, so that the brazing filler metal ring is prevented from falling off from the pipe body in the conveying process of the pipe body, and the working efficiency is greatly improved;
(5) through setting up material area inductive pick up, and will take material area inductive pick up to locate the top in material area, can detect whether the material area gets into the guide way, have and to judge whether the material area pulls tightly to make the material area keep lax state.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is an enlarged view of the structure of the tray and the guide grooves of the embodiment shown in FIG. 1;
FIG. 3 is an enlarged view of the rear end of the guide slot of the embodiment of FIG. 1;
FIG. 4 is a schematic structural diagram of a transfer body according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a carrier tape according to an embodiment of the invention;
FIG. 6 is a schematic structural view of a solder ring according to an embodiment of the present invention;
fig. 7 is a schematic structural view of a ferrule of a tube body according to an embodiment of the present invention.
The attached drawings indicate the following:
1. a material tray; 2. a material belt; 3. a guide groove; 4. a first lifting clamping mechanism; 5. a cutting mechanism; 6. a fastening mechanism; 7. a pipe body; 8. a positioning mechanism; 9. a pipe body conveying mechanism; 10. a strip sensor; 11. a feeding motor; 21. a brazing ring; 22. connecting ribs; 31. a channel; 32. closing the notch; 33. a guide plate; 41. a linear sliding table; 42. a first lifting cylinder; 43. a finger cylinder; 61. a transfer main body; 62. a transferring cylinder; 63. a clamping portion; 64. fastening the cylinder; 65. fastening the hand grip; 211. a protrusion; 212. edge turning; 331. positioning holes; 332. a long hole; 651. and (4) pressing head.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples.
A brazing filler metal device is detained to body includes: the material tray 1 is used for winding the material belt 2; the guide groove 3 is used for guiding the material belt 2 on the material disc to the side of the first lifting clamping mechanism; the first lifting clamping mechanism 4 is used for grabbing the material belt 2 and driving the material belt to move up and down; the cutting mechanism 5 is used for cutting the material belt 2 moved to the target position; the second lifting clamping mechanism is used for moving the cut material belt to the buckling mechanism 6; and the buckling mechanism 6 is used for buckling the cut material belt on the pipe body 7 to be fixed.
In this embodiment, by providing the material tray 1, the material belt can be wound around the material tray, the center of the material tray 1 is connected to the feeding motor 11, and the feeding motor 11 controls the material tray 1 to rotate for feeding. The material tray of the embodiment can be one or more.
In this embodiment, the material strap 2 includes a plurality of integrally connected solder rings 21, and each solder ring 21 includes a protrusion 211 extending along a hole and a wrenching edge 212 disposed at an edge of the solder ring; the engaging mechanism 6 inserts the projection 211 of the cut solder ring 21 into the tube body 7 and bends the flange 212 to engage with the tube body 7. The material belt 2 is in a strip shape, the solder rings 21 are connected through connecting ribs 22, and cutting of the single solder ring 21 is achieved by cutting at the positions of the connecting ribs 22.
In this embodiment, through setting up guide way 3, can stabilize the material area, and guide the material area and extend the back from the charging tray and follow the extension to first lift fixture side along the guide way. The guide groove 3 comprises at least one obliquely arranged channel 31, a closed notch 32 is arranged on the channel, and the material belt 2 can penetrate through the closed notch 32 from the beginning and penetrate out from the tail end. The guide groove 3 of the present embodiment preferably includes two obliquely disposed channels 31, the top of the channel 31 is arc-shaped, the channel extends obliquely from bottom to top, the material belt extends from bottom to top along one side of the channel, and passes through the top to enter the other side of the channel, and extends downward to the side of the first lifting and clamping mechanism, and is positioned at the side alignment position of the first lifting and clamping mechanism.
The rear end of the other side of the channel 31 is connected with a guide plate 33, the guide plate is of a single-layer or double-layer structure, and when the guide plate is of a double-layer structure, the material belt moves in the interlayer of the guide plate. The guide plate side is equipped with the support, is equipped with positioning mechanism 8 on the support, and positioning mechanism 8 is equipped with cutting mechanism's top. The guide plate 33 is provided with a positioning hole 331 at a position corresponding to the positioning mechanism 8, and the positioning mechanism 8 can be positioned by being inserted into the solder loop of the tape 2 along the positioning hole 331. The positioning mechanism 8 is preferably a positioning cylinder, and the positioning cylinder is inserted into the solder ring 21 through extending into the positioning hole 331 to realize positioning, so that the material belt is not easy to shake during cutting.
In this embodiment, the guide plate 33 is provided with a long hole 332 at a position corresponding to the first lifting clamping mechanism 4, so that the first lifting clamping mechanism 4 can grab the tape through the long hole 332 and drive the tape to move. Or the guide plate is two plates, a gap is arranged between the two plates, the material belt passes through the gap, and the first lifting clamping mechanism and the positioning mechanism can be operated from the gap.
In this embodiment, the guide way is preferred to include the passageway that two slopes set up, and the location cylinder has two, and preferred design becomes linkage structure, and two cylinders can stretch into simultaneously and stretch out to improve work efficiency, and simplify the structure. First lift clamping mechanism 4 includes sharp slip table 41, and first lift cylinder 42 is connected to the slider of sharp slip table, and two finger cylinders 43 are connected to first lift cylinder 42, and the tongs that finger cylinder connects can snatch the material area on the corresponding passageway respectively. Wherein, the straight line slip table is located on the support and is located the middle part of deflector.
In this embodiment, the cutting mechanism 5 is disposed below the first lifting and clamping mechanism, and includes a cutting cylinder and a blade, and the cutting cylinder controls the blade to move to cut the material belt.
In this embodiment, the tube conveying mechanism 9 is provided on one side of the engaging mechanism 6, the tube conveying mechanism 9 is provided between the passage 31 of the guide groove 3 and the guide plate 33, the tube conveying mechanism 9 is preferably a conveying chain conveyor, the plurality of tubes 7 are horizontally placed for conveying, when the tube conveying mechanism moves to the engaging mechanism side, the conveying is stopped, and the brazing ring 21 is waited to be engaged with the tube 7. The second lifting mechanism is positioned between the buckling mechanism and the pipe body conveying mechanism and used for moving the cut material belt to the buckling mechanism. The second lifting mechanism and the first lifting mechanism preferably have the same structure, and are not described in detail herein.
In this embodiment, the fastening mechanism 6 includes a horizontal moving portion for inserting the projection of the cut brazing filler metal ring into the pipe body, and a pulling edge fastening portion for fastening the pulling edge of the brazing filler metal ring to the pipe body. The horizontal moving part is preferably a transfer cylinder 62 and a transfer body 61, and the transfer body 61 is provided at its front end with a clamp 63 capable of grasping a solder ring and inserting the solder ring into a pipe body. The transfer main body 61 is provided with a wrench edge engaging portion. The edge pulling buckling part comprises buckling grips 65, the number of the buckling grips corresponds to the number and the positions of pulling edges on the brazing ring, the transferring main body 61 is connected with the buckling air cylinder 64 through a connecting piece, and the transferring air cylinder 62 drives the buckling air cylinder 64 and the transferring main body 61 to move back and forth. The snap cylinder 64 controls the action of the fastening hand 65 to fasten the flange 212 to the edge of the tubular body 7. Wherein, the front end of straining tongs 65 is equipped with pressure head 651, and the contained angle between pressure head 65 and the brazing filler metal circle 21 is preferred to be designed into 30 ~75, like this, will pull the limit through the pressure head and press the curved back, because the pressure head slope sets up, just can further straining on the body pulling the limit, greatly reduced defective rate. Otherwise, the brazing filler metal ring can fall off from the pipe body, so that the pipe body needs to return to the previous process to continue buckling the brazing filler metal ring, and the working efficiency is greatly reduced.
In this embodiment, be equipped with material area inductive sensor 10 between charging tray 2 and the guide way 3 for whether detect the material area material and whether the material area is pulled tightly, material area 2 passes through from the below of material area inductive sensor 10. The material belt induction sensor 10 passes through the lower part of the material belt induction sensor, but not the upper part, so as to detect whether the material belt is pulled tightly, namely the existing induction sensor can only detect whether the material is loaded or not generally, but the invention can also detect whether the material belt is pulled tightly, and the material belt is easy to tear once the material belt is pulled tightly, so that the process operation is suspended, and the working efficiency is reduced.
A method for buckling brazing filler metal on a pipe body comprises the following steps:
s101: and leading out and positioning the wound material belt.
Specifically, the material belt is led out from the material disc, passes through the material belt induction sensor and enters the channel of the guide groove, the material belt extends along the channel, penetrates into one end of a closed notch of the channel, penetrates out of the other end of the closed notch, and is aligned and positioned on the side of the positioning mechanism and the first lifting clamping mechanism. In addition, after the wound material belt is led out, whether the material belt is fed or not is detected in real time through a material belt induction sensor, and if the material belt is not fed, feeding is prompted; and detecting whether the material belt is tensioned, and controlling the material disc to rotate to enable the material belt to keep a loose state if the material belt is tensioned.
S102: the material belt is driven to move to a target position for cutting, so that a single brazing filler metal ring on the material belt is separated from the material belt.
Specifically, first lift fixture drives the material area and moves down, when treating to move to the target position of cutting mechanism, the cylinder action of location inserts in one of them brazing filler metal circle in material area to fixed brazing filler metal circle prevents to tailor the time brazing filler metal circle and produces and rock, then cutting mechanism tailors the material area, cuts next brazing filler metal circle, and when tailorring, second lift fixture rises, snatchs the brazing filler metal circle of tailorring, and moves down to lock mechanism.
S3: the brazing filler metal that breaks away from encloses to the body side, inserts the arch of brazing filler metal circle to the body in to buckle the limit of pulling of brazing filler metal circle the border of lock at the body, accomplish the fixed of brazing filler metal circle.
Claims (10)
1. The utility model provides a brazing filler metal device is detained to body which characterized in that includes:
the material tray is used for winding the material belt;
the guide groove is used for guiding the material belt on the material disc to the side of the first lifting clamping mechanism;
the first lifting clamping mechanism is used for grabbing the material belt and driving the material belt to move up and down;
the cutting mechanism is used for cutting the material belt moved to the target position;
the second lifting clamping mechanism is used for moving the cut material belt to the buckling mechanism;
and the buckling mechanism is used for buckling the cut material belt on the pipe body to be fixed.
2. The pipe body brazing device according to claim 1, wherein the material strap comprises a plurality of integrally connected brazing filler metal rings, and each brazing filler metal ring comprises a protrusion extending out of a hole and a wrenching edge arranged at the edge of the brazing filler metal ring; the buckling mechanism inserts the bulges of the cut brazing filler metal rings into the pipe body and buckles the pull edge on the pipe body in a bending mode.
3. A pipe body brazing device according to claim 1 or 2, wherein the guide groove comprises at least one obliquely arranged channel, a closed notch is formed in the channel, and the material belt can penetrate through the closed notch from the beginning and penetrate out from the end.
4. A pipe body brazing device according to claim 1 or 2, wherein a guide plate is connected to a rear end of the guide groove, a positioning mechanism is arranged on the side of the guide plate, and the positioning mechanism is arranged above the cutting mechanism.
5. The pipe brazing device according to claim 4, wherein the guide plate is provided with positioning holes at positions corresponding to the positioning mechanisms, and the positioning mechanisms can be inserted into the brazing rings of the material belts along the positioning holes for positioning.
6. The pipe brazing device according to claim 4, wherein the guide plate is provided with a long hole at a position corresponding to the first lifting and clamping mechanism, so that the first lifting and clamping mechanism can grab the material strap through the long hole and move the material strap.
7. The pipe body brazing device according to claim 2, wherein a pipe body conveying mechanism is arranged on one side of the buckling mechanism, and the second lifting mechanism is located between the buckling mechanism and the pipe body conveying mechanism; the buckling mechanism comprises a horizontal moving part used for inserting the projection of the cut brazing filler metal ring into the pipe body and a pulling edge buckling part used for buckling the pulling edge of the brazing filler metal ring on the pipe body.
8. The pipe body brazing device according to claim 1 or 2, wherein a material belt induction sensor is arranged between the material tray and the guide groove and used for detecting whether a material belt is fed or not and whether the material belt is pulled tightly or not, and the material belt passes through the lower portion of the material belt induction sensor.
9. A method for buckling brazing filler metal on a pipe body is characterized by comprising the following steps:
s1: leading out and positioning the wound material belt;
s2: driving the material belt to move to a target position for cutting, so that the single brazing ring on the material belt is separated from the material belt;
s3: the brazing filler metal that breaks away from encloses to the body side, inserts the arch of brazing filler metal circle to the body in to buckle the limit of pulling of brazing filler metal circle the border of lock at the body, accomplish the fixed of brazing filler metal circle.
10. The method for brazing a pipe body according to claim 9, wherein in S1, after the wound tape is drawn out, whether the tape is loaded or not is detected in real time, and if no tape is loaded, loading is prompted; and detecting whether the material belt is tensioned, and controlling the material disc to rotate to enable the material belt to keep a loose state if the material belt is tensioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110326729.8A CN113020745B (en) | 2021-03-26 | 2021-03-26 | Device and method for buckling brazing filler metal on pipe body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110326729.8A CN113020745B (en) | 2021-03-26 | 2021-03-26 | Device and method for buckling brazing filler metal on pipe body |
Publications (2)
| Publication Number | Publication Date |
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| CN113020745A true CN113020745A (en) | 2021-06-25 |
| CN113020745B CN113020745B (en) | 2022-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110326729.8A Active CN113020745B (en) | 2021-03-26 | 2021-03-26 | Device and method for buckling brazing filler metal on pipe body |
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| Country | Link |
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| CN (1) | CN113020745B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0839239A (en) * | 1994-07-28 | 1996-02-13 | Nec Corp | Feeding mechanism of ribbon solder |
| CN103192153A (en) * | 2013-04-20 | 2013-07-10 | 张家口北方对焊机有限公司 | Rocket engine jet pipe brazing strip automatic rolling point welding machine and rolling point welding process |
| CN105773147A (en) * | 2016-05-26 | 2016-07-20 | 昆山思瑞奕电子有限公司 | Automatic assembling mechanism of connector assembly |
| CN109530956A (en) * | 2018-12-28 | 2019-03-29 | 远大可建科技有限公司 | The welder and method of a kind of solder, core pipe and solder |
| CN110681939A (en) * | 2019-10-21 | 2020-01-14 | 远大可建科技有限公司 | Core tube buckle brazing filler metal device |
-
2021
- 2021-03-26 CN CN202110326729.8A patent/CN113020745B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0839239A (en) * | 1994-07-28 | 1996-02-13 | Nec Corp | Feeding mechanism of ribbon solder |
| CN103192153A (en) * | 2013-04-20 | 2013-07-10 | 张家口北方对焊机有限公司 | Rocket engine jet pipe brazing strip automatic rolling point welding machine and rolling point welding process |
| CN105773147A (en) * | 2016-05-26 | 2016-07-20 | 昆山思瑞奕电子有限公司 | Automatic assembling mechanism of connector assembly |
| CN109530956A (en) * | 2018-12-28 | 2019-03-29 | 远大可建科技有限公司 | The welder and method of a kind of solder, core pipe and solder |
| CN110681939A (en) * | 2019-10-21 | 2020-01-14 | 远大可建科技有限公司 | Core tube buckle brazing filler metal device |
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| Publication number | Publication date |
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| CN113020745B (en) | 2022-07-05 |
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