CN112222748B - External pipeline welding assembly device - Google Patents
External pipeline welding assembly device Download PDFInfo
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- CN112222748B CN112222748B CN202011070728.3A CN202011070728A CN112222748B CN 112222748 B CN112222748 B CN 112222748B CN 202011070728 A CN202011070728 A CN 202011070728A CN 112222748 B CN112222748 B CN 112222748B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0533—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 external pipe alignment clamps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention relates to the technical field of external pipeline welding assembly accessories, in particular to an external pipeline welding assembly device, which is a portable pipeline rounding and assembly device, prevents the pipe orifice of a pipeline from deforming, ensures that the pipeline keeps coaxial and round when being welded, avoids the quality problems of staggered joint welding and weld crater stress concentration when being welded on a construction site, and comprises a first pipeline rounding device, a second pipeline rounding device and a connecting device for connecting the first pipeline rounding device and the second pipeline rounding device; first pipeline rounding device and second pipeline rounding device all include fixed baseplate, movable base and two sets of mechanism box bodies, and fixed baseplate includes that two sets of right angles set up fixed rack, and movable base includes the movable rack that two sets of right angles set up, is provided with fixed drive gear, movable drive gear, motor and slip gear on the mechanism box body, and connecting device includes two sets of power auto-change over device, two sets of to drawing screw rod and two sets of to drawing drive gear.
Description
Technical Field
The invention relates to the technical field of external pipeline welding assembly accessory devices, in particular to an external pipeline welding assembly accessory device.
Background
During engineering construction, improper measures and self-weight reasons of pipelines in the processes of loading, unloading and transportation can cause deformation of pipe orifices, and phenomena of wrong seam welding, weld stress concentration and more pressure test leakage points of the pipelines can occur during groove or welding of the pipelines, so that hidden dangers are buried for engineering quality, and the common fault of the engineering quality is caused.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a portable pipeline rounding and assembling device, which is an external pipeline welding and assembling device for preventing the pipe orifice of a pipeline from deforming, ensuring that the pipeline keeps coaxial and round during welding and avoiding the quality problems of staggered joint welding and weld crater stress concentration during welding in a construction site.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: an external pipeline welding assembly device comprises a first pipeline rounding device, a second pipeline rounding device and a connecting device for connecting the first pipeline rounding device and the second pipeline rounding device; the first pipeline rounding device and the second pipeline rounding device both comprise a fixed base, a movable base and two groups of mechanism box bodies, the fixed base comprises two groups of fixed toothed bars arranged at right angles, the movable base comprises two groups of movable toothed bars arranged at right angles, cavities are arranged inside the two groups of mechanism box bodies, a fixed driving gear, a movable driving gear and a transmission gear which can rotate are arranged in the cavity, the movable driving gear is meshed with the transmission gear, the outer side of the mechanism box body is provided with a motor, the output end of the motor extends into the working cavity, a sliding gear is arranged at the output end of the motor, the sliding gear is meshed with the transmission gear and the fixed driving gear, a fixed through hole for the fixed rack rod to pass through and a movable through hole for the movable rack rod to pass through are arranged on the mechanism box body, the fixed toothed bar passes through the fixed through hole and is meshed with the fixed driving gear, the movable toothed bar passes through the movable through hole and is meshed with the movable driving gear, the connecting device comprises two groups of power switching devices, two groups of opposite-pulling screw rods and two groups of opposite-pulling driving gears, the two groups of opposite-pull driving gears are respectively and rotatably arranged on the two groups of mechanism box bodies of the first pipeline rounding device, the two groups of power switching devices are respectively arranged on the two groups of mechanism box bodies of the first pipeline rounding device, the two groups of power switching devices respectively drive the two groups of sliding gears of the first pipeline rounding device, the sliding gears of the first pipeline rounding device can slide between the transmission gear and the opposite-pull driving gear, one ends of the two groups of counter-pulling screw rods are respectively connected with the two groups of counter-pulling driving gears, and the other ends of the two groups of counter-pulling screw rods are in threaded connection with the second pipeline rounding device.
Preferably, a limiting wheel for limiting the fixed toothed bar and the movable toothed bar is arranged in the cavity, and the limiting wheel is tightly attached to one sides of the planes of the fixed toothed bar and the movable toothed bar.
Preferably, the two groups of fixed toothed bars and the two groups of movable toothed bars enclose a square structure.
Preferably, the inside of mechanism box body is provided with two sets of electronic contrary devices that carry out spacing respectively to fixed ratch and activity ratch, electronic contrary device that ends includes miniature electric putter and contrary tooth, miniature electric putter's output is connected with contrary tooth, and is two sets of contrary tooth that ends respectively with fixed ratch and the interlock of activity ratch.
Preferably, the pipeline rounding device further comprises a guide sliding rod, a limiting hole is formed in the second pipeline rounding device, one end of the guide sliding rod is fixedly connected with the first pipeline rounding device, and the other end of the guide sliding rod penetrates through the limiting hole.
Preferably, the first pipeline rounding device and the second pipeline rounding device are respectively provided with a controller for controlling two groups of motors, and the controllers are electrically connected with a remote controller.
Preferably, the movable base is provided with a connector, and the two groups of movable toothed bars are connected with the connector through bolts.
Preferably, the power switching device comprises a second electric push rod, the second electric push rod is installed on a mechanism box body of the first pipeline rounding device, an output end of the second electric push rod extends into the cavity, and a finger shifting piece for shifting the sliding gear is arranged at the end part of the second electric push rod.
(III) advantageous effects
Compared with the prior art, the invention provides an external pipeline welding assembly device, which has the following beneficial effects: according to the external pipeline welding assembly device, a first pipeline rounding device and a second pipeline rounding device are respectively sleeved on the outer sides of two groups of pipelines, a sliding gear is driven to rotate through a motor, the sliding gear drives a fixed driving gear and a transmission gear to rotate, the transmission gear drives a movable driving gear to rotate, and the fixed driving gear and the movable driving gear respectively drive a fixed toothed bar and a movable toothed bar to slide, so that a square formed by the two groups of fixed toothed bars and the two groups of movable toothed bars is reduced, and the pipelines are extruded to be in a perfect circle shape; then the sliding gear of the motor is switched to the opposite-pulling driving gear through the power switching device, the motor drives the sliding gear to rotate, the sliding gear drives the opposite-pulling driving gear and the opposite-pulling screw to rotate, the first pipeline rounding device and the second pipeline rounding device are drawn close through the opposite-pulling screw, the end faces of the two groups of pipelines are drawn close, after the two groups of pipelines are drawn to a specified gap, spot welding fixing is carried out, the pipelines are assembled, finally, the first pipeline rounding device and the second pipeline rounding device are disassembled, and the portable pipeline rounding and assembling device can prevent the pipe orifice of the pipeline from deforming, ensure that the pipelines are kept coaxial and round during welding, and avoid the quality problems of staggered seam welding and weld stress concentration during welding in a construction site.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic perspective view of the present invention;
FIG. 3 is a schematic left side view of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3;
FIG. 5 is a schematic structural diagram of the connection of the mechanism box, the motor and the power switching device of the present invention;
FIG. 6 is a schematic top view of the power switching device and sliding gear connection of the present invention;
in the drawings, the reference numbers: 1. a first pipe rounding device; 2. a second pipe rounding device; 3. a mechanism case; 4. a fixed rack bar; 5. a movable rack bar; 6. a fixed drive gear; 7. a movable drive gear; 8. a transmission gear; 9. an electric motor; 10. a sliding gear; 11. a power switching device; 12. oppositely pulling the screw rod; 13. a counter-pulling driving gear; 14. a limiting wheel; 15. a miniature electric push rod; 16. stopping the teeth reversely; 17. a guide slide bar; 18. a controller; 19. a remote controller; 20. a connector; 21. a second electric push rod; 22. a finger plectrum.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, an external pipeline welding assembly device according to the present invention includes a first pipeline rounding device 1, a second pipeline rounding device 2, and a connecting device for connecting the first pipeline rounding device 1 and the second pipeline rounding device 2; the first pipeline rounding device 1 and the second pipeline rounding device 2 both comprise a fixed base, a movable base and two groups of mechanism box bodies 3, the fixed base comprises two groups of right-angle arranged fixed toothed bars 4, the movable base comprises two groups of right-angle arranged movable toothed bars 5, cavities are arranged inside the two groups of mechanism box bodies 3, fixed driving gears 6, movable driving gears 7 and transmission gears 8 are rotatably arranged in the cavities, the movable driving gears 7 are meshed with the transmission gears 8, the outer sides of the mechanism box bodies 3 are provided with motors 9, the output ends of the motors 9 extend into the working cavity, sliding gears 10 are arranged at the output ends of the motors 9, the sliding gears 10 are meshed with the transmission gears 8 and the fixed driving gears 6, fixed through holes for the fixed toothed bars 4 to penetrate and movable through holes for the movable toothed bars 5 to penetrate are arranged on the mechanism box bodies 3, the fixed toothed bars 4 penetrate through the fixed through holes and are meshed with the fixed driving gears 6, the movable toothed bars 5 penetrate through the movable through holes and are meshed with the driving gears 7, the connecting devices comprise two groups of power switching devices 11, two groups of counter-pulling screws 12 and two groups of counter-pulling screws 13, the connecting devices 13 of the first pipeline rounding device 1 and the second pipeline rounding device 13 are respectively arranged on the first pipeline rounding device 3, the first pipeline rounding device and the first pipeline rounding device 1 and the second mechanism box bodies 3, the connecting devices 11, the sliding gears 10 of the two groups of the second pipeline rounding device 3, the sliding gears 10 are respectively, the other ends of the two groups of counter-pulling screw rods 12 are connected with the second pipeline rounding device 2 through threads; the first pipeline rounding device 1 and the second pipeline rounding device 2 are respectively sleeved on the outer sides of two groups of pipelines, a sliding gear 10 is driven to rotate through a motor 9, the sliding gear 10 drives a fixed driving gear 6 and a transmission gear 8 to rotate, the transmission gear 8 drives a movable driving gear 7 to rotate, and the fixed driving gear 6 and the movable driving gear 7 respectively drive a fixed toothed bar 4 and a movable toothed bar 5 to slide, so that a square surrounded by the two groups of fixed toothed bars 4 and the two groups of movable toothed bars 5 is reduced, and the pipelines are extruded to be in a perfect circle shape; then, a sliding gear 10 of a motor 9 is switched to a counter-pull driving gear 13 through a power switching device 11, the motor 9 drives the sliding gear 10 to rotate, the sliding gear 10 drives the counter-pull driving gear 13 and a counter-pull screw 12 to rotate, a first pipeline rounding device 1 and a second pipeline rounding device 2 are drawn close through the counter-pull screw 12, so that end faces of two groups of pipelines are drawn close, after the end faces are drawn to a specified gap, spot welding and fixing are carried out, assembly of the pipelines is completed, finally the first pipeline rounding device 1 and the second pipeline rounding device 2 are disassembled, the portable pipeline rounding and assembly device is used for preventing pipe orifices of the pipelines from deforming, ensuring that the pipelines are kept coaxial and rounded during welding, avoiding the problems of wrong joint welding and weld stress concentration quality during welding in a construction site, and further comprises a guide slide rod 17, wherein a limit hole is formed in the second pipeline rounding device 2, one end of the guide slide rod 17 is fixedly connected with the first pipeline rounding device 1, and the other end of the guide slide rod 17 penetrates through the limit hole; the alignment of the first pipe rounding device 1 and the second pipe rounding device 2 is ensured by the guide slide 17.
A limiting wheel 14 for limiting the fixed toothed bar 4 and the movable toothed bar 5 is arranged in the cavity, and the limiting wheel 14 is tightly attached to one side of the plane of the fixed toothed bar 4 and one side of the plane of the movable toothed bar 5; the stability of the fixed toothed bar 4 and the movable toothed bar 5 during movement is improved by the limiting wheel 14.
The two groups of fixed toothed bars 4 and the two groups of movable toothed bars 5 form a square structure; the two groups of fixed toothed bars 4 and the two groups of movable toothed bars 5 can be ensured to shape the pipeline.
Two groups of electric check devices for limiting the fixed toothed bar 4 and the movable toothed bar 5 respectively are arranged in the mechanism box body 3, each electric check device comprises a miniature electric push rod 15 and a check tooth 16, the output end of the miniature electric push rod 15 is connected with the check tooth 16, and the two groups of check teeth 16 are meshed with the fixed toothed bar 4 and the movable toothed bar 5 respectively; will end through miniature electric putter 15 against tooth 16 promote to with fixed ratch 4, the position of activity ratch 5 interlock, it is not hard up that the tooth 16 that ends prevents fixed ratch 4 and activity ratch 5 back slip, accomplish the group of pipeline to the back, will end against tooth 16 through miniature electric putter 15 and return, can carry out the split to fixed ratch 4 and activity ratch 5.
The first pipeline rounding device 1 and the second pipeline rounding device 2 are both provided with controllers 18 for controlling two groups of motors 9, and the controllers 18 are electrically connected with a remote controller 19; the controller 18 is controlled by a remote control 19, and the motor 9 is controlled by the controller 18.
The movable base is provided with a connector 20, and the two groups of movable toothed bars 5 are connected with the connector 20 through bolts; the movable rack bar 5 is connected with the connector 20, so that the movable rack bar 5 is conveniently disassembled.
The power switching device comprises a second electric push rod 21, the second electric push rod 21 is installed on a mechanism box body of the first pipeline rounding device, the output end of the second electric push rod extends into the cavity, and a finger shifting piece 22 for shifting the sliding gear 10 is arranged at the end part of the second electric push rod; the second electric push rod 21 pushes the finger shifting piece 22 to move, the finger shifting piece 22 drives the sliding gear 10 to slide on the output shaft of the motor 9, switching of the sliding gear 10 is achieved, transmission is guaranteed through key groove connection between the output shaft of the motor and the sliding gear, the counter-pull driving gear, the fixed driving gear and the transmission gear are all conical wheels, and the sliding gear is guaranteed to be meshed with the counter-pull driving gear, the fixed driving gear and the transmission gear conveniently.
When the pipeline rounding device is used, the first pipeline rounding device 1 and the second pipeline rounding device 2 are respectively sleeved on the outer sides of two groups of pipelines, the sliding gear 10 is driven to rotate by the motor 9, the sliding gear 10 drives the fixed driving gear 6 and the transmission gear 8 to rotate, the transmission gear 8 drives the movable driving gear 7 to rotate, the fixed gear rod 4 and the movable gear rod 5 are respectively driven to slide by the fixed driving gear 6 and the movable driving gear 7, and therefore a square formed by the two groups of fixed gear rods 4 and the two groups of movable gear rods 5 is reduced, and the pipelines are extruded to be in a perfect circle shape; then, a sliding gear 10 of a motor 9 is switched to a split drive gear 13 through a power switching device 11, the motor 9 drives the sliding gear 10 to rotate, the sliding gear 10 drives the split drive gear 13 and a split screw 12 to rotate, a first pipeline rounding device 1 and a second pipeline rounding device 2 are drawn close through the split screw 12, so that end faces of two groups of pipelines are drawn close, after the two groups of pipelines are drawn to a specified gap, spot welding fixing is carried out, assembly of the pipelines is completed, a reverse stop tooth 16 is pushed to a position meshed with a fixed toothed bar 4 and a movable toothed bar 5 through a micro electric push rod 15, the reverse stop tooth 16 prevents the fixed toothed bar 4 and the movable toothed bar 5 from sliding backwards and loosening, after assembly of the pipelines is completed, the reverse stop tooth 16 is returned through the micro electric push rod 15, the fixed toothed bar 4 and the movable toothed bar 5 can be detached, finally the first pipeline rounding device 1 and the second pipeline rounding device 2 can be detached, the two groups of movable toothed bars can be detached conveniently through a connector, the portable pipeline rounding device and the assembly of the pipelines can be prevented from deforming, the pipelines, the welding deformation and the problem of the welding and the concentrated welding stress of the welding ports can be avoided during construction.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. An external pipeline welding assembly device is characterized by comprising a first pipeline rounding device (1), a second pipeline rounding device (2) and a connecting device for connecting the first pipeline rounding device (1) with the second pipeline rounding device (2); the first pipeline rounding device (1) and the second pipeline rounding device (2) respectively comprise a fixed base, a movable base and two groups of mechanism box bodies (3), the fixed base comprises two groups of fixed toothed bars (4) which are arranged at a right angle, the movable base comprises two groups of movable toothed bars (5) which are arranged at a right angle, cavities are arranged inside the two groups of mechanism box bodies (3), and respectively provided with a rotatable fixed driving gear (6), a movable driving gear (7) and a transmission gear (8) in the cavities, the movable driving gear (7) is meshed with the transmission gear (8), an electric motor (9) is arranged outside the mechanism box bodies (3), the output end of the electric motor (9) extends into the working cavity and is provided with a sliding gear (10) at the output end of the electric motor (9), the sliding gear (10) is respectively meshed with the transmission gear (8) and the fixed driving gear (6), a fixed through hole for the fixed toothed bar (4) to pass through and a movable through hole for the movable toothed bar (5) to pass through are arranged on the mechanism box body (3), the fixed toothed bar (4) passes through hole and is meshed with the fixed driving gear (6), the movable driving gear (7) and the movable driving gear (12) and is connected with a pair-pulling screw rod switching device (12), the two groups of counter-pulling driving gears (13) are respectively and rotatably arranged on two groups of mechanism box bodies (3) of the first pipeline rounding device (1), the two groups of power switching devices (11) are respectively arranged on the two groups of mechanism box bodies (3) of the first pipeline rounding device (1), the two groups of power switching devices (11) respectively drive two groups of sliding gears (10) of the first pipeline rounding device (1), the sliding gears (10) of the first pipeline rounding device (1) can slide between the transmission gears (8) and the counter-pulling driving gears (13), one ends of the two groups of counter-pulling screw rods (12) are respectively connected with the two groups of counter-pulling driving gears (13), and the other ends of the two groups of counter-pulling screw rods (12) are connected with the second pipeline rounding device (2) through threads; a limiting wheel (14) for limiting the fixed toothed bar (4) and the movable toothed bar (5) is arranged in the cavity, and the limiting wheel (14) is tightly attached to one sides of the planes of the fixed toothed bar (4) and the movable toothed bar (5); the two groups of fixed toothed bars (4) and the two groups of movable toothed bars (5) form a square structure in a surrounding manner; the inside of mechanism box body (3) is provided with two sets ofly and carries out spacing electronic contrary device that ends to fixed ratch (4) and activity ratch (5) respectively, electronic contrary device that ends includes miniature electric putter (15) and contrary tooth (16) that ends, the output and the contrary tooth (16) of miniature electric putter (15) are connected, and are two sets of contrary tooth (16) that ends interlock with fixed ratch (4) and activity ratch (5) respectively.
2. The external pipeline welding pairing device according to claim 1, further comprising a guide sliding rod (17), wherein a limiting hole is formed in the second pipeline rounding device (2), one end of the guide sliding rod (17) is fixedly connected with the first pipeline rounding device (1), and the other end of the guide sliding rod (17) penetrates through the limiting hole.
3. The external pipeline welding group pairing device as defined in claim 2, wherein the first pipeline rounding device (1) and the second pipeline rounding device (2) are respectively provided with a controller (18) for controlling the two groups of motors (9), and the controllers (18) are electrically connected with a remote controller (19).
4. An external pipeline welding pairing device according to claim 3, wherein a connector (20) is arranged on the movable base, and the two groups of movable toothed bars (5) are connected with the connector (20) through bolts.
5. The external pipeline welding assembly device as claimed in claim 4, wherein the power switching device (11) comprises a second electric push rod (21), the second electric push rod is mounted on the mechanism box body (3) of the first pipeline rounding device (1), an output end of the second electric push rod extends into the cavity, and a finger poking piece (22) for poking the sliding gear is arranged at an end portion of the second electric push rod (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011070728.3A CN112222748B (en) | 2020-10-09 | 2020-10-09 | External pipeline welding assembly device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011070728.3A CN112222748B (en) | 2020-10-09 | 2020-10-09 | External pipeline welding assembly device |
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| Publication Number | Publication Date |
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| CN112222748A CN112222748A (en) | 2021-01-15 |
| CN112222748B true CN112222748B (en) | 2023-01-17 |
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| JP6426482B2 (en) * | 2015-01-14 | 2018-11-21 | ＨＯＹＡ Ｔｅｃｈｎｏｓｕｒｇｉｃａｌ株式会社 | Surgical instruments |
| CN205096800U (en) * | 2015-11-25 | 2016-03-23 | 华创天元实业发展有限责任公司 | Compound effective group is to connecting advancing device |
| CN210557869U (en) * | 2019-07-02 | 2020-05-19 | 常州市郝思琳医用仪器有限公司 | Mechanism for continuously loading glass slides |
| CN210721957U (en) * | 2019-07-19 | 2020-06-09 | 常志红 | Teaching aid is used in teaching of many show forms of height-adjustable |
| CN210439521U (en) * | 2019-08-02 | 2020-05-01 | 深圳龙源精造建设集团有限公司 | Non-welding environment-friendly energy-saving slotted back bolt stone curtain wall |
| CN210878388U (en) * | 2019-10-11 | 2020-06-30 | 浙江华锦焊接设备有限公司 | Radial fixing mechanism for welding circular tube |
| CN111006727B (en) * | 2019-12-31 | 2024-06-25 | 姜春林 | Elastic variable cross-section device |
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