CN108188649A - A kind of clamping device of thin-walled varying cross-section duct - Google Patents

A kind of clamping device of thin-walled varying cross-section duct Download PDF

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Publication number
CN108188649A
CN108188649A CN201810084463.9A CN201810084463A CN108188649A CN 108188649 A CN108188649 A CN 108188649A CN 201810084463 A CN201810084463 A CN 201810084463A CN 108188649 A CN108188649 A CN 108188649A
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CN
China
Prior art keywords
thin
clamp
type
sliding
section
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CN201810084463.9A
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Chinese (zh)
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CN108188649B (en
Inventor
蒋兰芳
王亚群
邵泓
陈志雅
马万琪
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/053Auxiliary 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/0426Fixtures for other work
    • B23K37/0435Clamps
    • B23K37/0443Jigs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/053Auxiliary 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
    • B23K37/0533Auxiliary 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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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)
  • Supports For Pipes And Cables (AREA)

Abstract

The present invention discloses a kind of clamping device of thin-walled varying cross-section duct, the first clamp module for being used to clamp variable cross-section section thin-wall tube including bottom plate and on bottom plate and the second clamp module for clamping straightway thin-wall tube;The first sliding groove for installing the first clamp module and the second sliding slot for installing the second clamp module are provided on bottom plate, first clamp module includes V-type clamp system, upright sliding bar and U-shaped mounting bracket, upright sliding bar is installed in the first sliding groove, U-shaped mounting bracket is fixed on upright sliding bar, V-type clamp system one end is connected on upright sliding bar, middle part is connected on U-shaped mounting bracket, and the V-type pawl of V-type clamp system is used to clamp the periphery of variable cross-section section thin-wall tube;Second clamp module includes several grip slides, and grip slide is mounted on second sliding slot, for clamping straightway thin-wall tube.The clamping device of the present invention has certain versatility, and accurate positioning, and welding precision and operating efficiency are high.

Description

A kind of clamping device of thin-walled varying cross-section duct
Technical field
The present invention relates to the manufacture fields of thin-walled varying cross-section duct, and in particular to a kind of clamping device of thin-walled varying cross-section duct.
Background technology
In the environmental control system of aerospace field, transport system, dynamical system, it is often necessary to using thin-walled varying cross-section duct, Global design is realized to make full use of limited space, and mitigate overall weight.It is generally first right when processing thin-walled varying cross-section duct Straightway thin-wall tube and variable cross-section thin-wall tube carry out the pretreatment such as cutting, then carry out welding processing respectively.During welding, to straightway The positioning requirements of thin-wall tube and variable cross-section thin-wall tube are very high.Since the application range of such pipe fitting is more special, belong to small lot If production without targetedly clamping device, can only rely on positioning to be by hand subjected to, so as to be easy to cause processing The problem of precision is not high, operating efficiency is not high, time-consuming and laborious.
Invention content
Processing is be easy to cause during the present invention seeks to solve by positioning progress thin-walled varying cross-section duct welding processing by hand The problem of precision is not high, operating efficiency is low, time-consuming and laborious, propose a kind of welding, have certain versatility, one can be applicable in Fixed tube part size range, and accurate positioning, can improve welding precision and operating efficiency thin-walled varying cross-section duct clamping device.
The technical solution adopted by the present invention is as follows:
A kind of clamping device of thin-walled varying cross-section duct, which is characterized in that the clamping device includes bottom plate 1 and mounted on institute On the bottom plate 1 stated for clamp variable cross-section thin-wall tube the first clamp module 2 and for clamp straightway thin-wall tube second Clamp module 3;
The first sliding groove 11 for installing the first clamp module 2 is provided on the bottom plate 1 and for installing the second folder The second sliding slot 12 of tight module 3, first clamp module 2 include V-type clamp system 21, upright sliding bar 22 and U-shaped installation Frame 23, the upright sliding bar 22 are installed in the first sliding groove 11, and the U-shaped mounting bracket 23 is fixed on described erect On straight slide bar 22, described 21 one end of V-type clamp system is connected on the upright sliding bar 22, and middle part is connected to the U On type mounting bracket 23, the V-type pawl of the V-type clamp system 21 is used to clamp the periphery of the variable cross-section section thin-wall tube;
Second clamp module 3 includes several grip slides 31, and the grip slide 31 is mounted on described Second sliding slot 12, for clamping the straightway thin-wall tube.
Further, the V-type clamp system 21 includes the adjustable clamp arm 211 of a pair of of angle, slide guide frame 212 and prevents Transfer gasket 213, one end of the slide guide frame 212 is provided with clamp arm mounting platform 2121 and installation through-hole 2122, described Clamp arm 211, anti-transfer gasket 213 be fixedly connected in the installation through-hole 2122 of one end of the slide guide frame 212, and The anti-transfer gasket 213 is mounted among a pair of of clamp arm 211.
Further, the first sliding groove for adjusting 21 position of V-type clamp system is additionally provided on the slide guide frame 212 2124 and for V-type clamp system 21 to be installed on to the second sliding slot 2123 on the upright sliding bar 22, the U-shaped installation U-type groove 231 is provided on frame 23, sliding groove 221 is provided on the upright sliding bar 22, fixing device passes through described first The V-type clamp system 21 is fixedly connected by sliding slot 2124 with the U-type groove 231 with U-shaped mounting bracket 23, and described is vertical Slide bar 22 passes through the second sliding slot 2123, and passes through fixing device by the V-type clamp system 21 and described vertical Slide bar 22 is fixedly connected.
Further, rubber antiskid pad 2111 is provided on the inside of the clamping of the clamp arm 211, outside is set as hollow Structure 2112.
Further, the first sliding groove 11 and second sliding slot 12 are T-slot.
Further, the bottom of the upright sliding bar 22 is provided with and 11 corresponding sliding block of the first sliding groove.
Further, the grip slide 31 of second clamp module 3 be L-type grip slide, the grip slide 31 are provided with rubber antiskid pad 311 on the surface of the straightway thin-wall tube, the L-type grip slide 31 it is another End is provided with mounting platform 312 and installation through-hole 313, and the L-type grip slide 31 is installed on described by fixing device In second sliding slot 12 on bottom plate 1.
Further, the first through hole slot 13 of positioning, the first through hole slot 13 are additionally provided on the bottom plate 1 The lower part of the first sliding groove 11 is set to, and is connected with the first sliding groove 11, it is fixed to be additionally provided on the bottom plate 1 Position the second through-hole groove 14, second through-hole groove 14 be set to described in second sliding slot 12 lower part, and with it is described Second sliding slot 12 connects.
Further, the first sliding groove 11, second sliding slot 12,13 and second through-hole groove 14 of first through hole slot are more It is a, and be uniformly distributed on the bottom plate 1.
Further, the fixing device is bolt and nut.
Beneficial effects of the present invention are embodied in:
1) adjustable angle between the clamp arm of V-type clamp system, can clamp the pipe fitting in the range of certain size, have Certain versatility.It clamps wall and clamps the rubber antiskid pad that inside is set, can effectively increase friction, prevent from sliding, simultaneously Cushioning effect can be played, avoid crushing thin-wall tube or destroys thin-walled tube exterior.The hollow structure of clamp arm improves rigidity Dead weight is alleviated again, improves the stability of entire mechanism.
2) slide guide frame is provided in V-type clamp system, can realize its slip, adjustment and fixation in left and right directions;It is perpendicular The sliding groove set on straight slide bar achieves the whole slip, adjustment and positioning in upper-lower height direction of V-type clamp system; The bottom of upright sliding bar is provided with T-shaped slider corresponding with the T shape sliding slots on bottom plate, so as to fulfill upright sliding bar in the horizontal plane Slip, so as to fulfill three one-movement-freedom-degrees of clamping device, improve the versatility of clamping device.
3) U-shaped mounting bracket on upright sliding bar is installed, can adjust the holding angle of V-type clamp system and variable cross-section section thin-wall tube Degree, so as to which V-type clamp system be made effectively to clamp variable cross-section section thin-wall tube.
Description of the drawings
Fig. 1 is the overall structure diagram of the clamping device of the thin-walled varying cross-section duct of the present invention;
Fig. 2 is the structural blast schematic diagram of V-type clamp system;
Fig. 3 is the structure diagram of L-type grip slide;
Fig. 4 is that the ladder of bottom plate cuts open structure diagram;
In figure, 1- bottom plates, the first clamp modules of 2-, the second clamp modules of 3-, the first T shape sliding slots of 11-, the 2nd T shapes of 12- cunning Slot, 13- first through hole slots, the second through-hole grooves of 14-, 21-V type clamp systems, 22- upright sliding bars, 23-U type mounting brackets, 31-L types Grip slide, 41- variable cross-section section thin-wall tubes, 42- straightway thin-wall tubes, 211- clamp arms, 212- slide guide framves, the anti-transfer pads of 213- Piece, 221- sliding grooves, 231-U type grooves, 232-U type mounting bracket mounting platforms, 311- the second rubber antiskid pads, 312- installations are flat Platform, 313- installation through-holes, 2111- the first rubber antiskid pads, 2112- hollow structures, 2113- circular mounting boss, 2114- are round Installation through-hole, 2121- clamp arm mounting platforms, 2122- clamp arm installation through-holes, 2123- second sliding slots, 2124- the first sliding grooves.
Specific embodiment
Below according to attached drawing and the preferred embodiment detailed description present invention, the objects and effects of the present invention will become brighter In vain, below in conjunction with drawings and examples, the present invention will be described in further detail.It is it should be appreciated that described herein specific Embodiment is only used to explain the present invention, is not intended to limit the present invention.
As shown in Figs 1-4, a kind of clamping device of thin-walled varying cross-section duct including bottom plate 1, is equipped with clamping and becomes on bottom plate 1 First clamp module 2 of section thin-wall tube and the second clamp module 3 for clamping straightway thin-wall tube;First clamp module 2 wraps Include V-type clamp system 21, upright sliding bar 22 and U-shaped mounting bracket 23;Second clamp module 3 includes several L-type grip slides 31; Several the first T shapes sliding slots 11 for installing clamp module 2 and the 2nd T shapes for installing clamp module 3 are provided on bottom plate 1 Sliding slot 12.
V-type clamp system 21 includes the adjustable clamp arm 211 of a pair of of angle, slide guide frame 212 and anti-transfer gasket 213.Folder The first rubber antiskid pad 2111 is provided on the inside of the clamping of tight arm 211, to increase friction, and avoids crushing thin-wall tube;Outside is set Hollow structure 2112 is set to, so as to improve rigidity and mitigate dead weight;Tail end is provided with circular mounting boss 2113 and circular mounting Through-hole 2114.One end of slide guide frame 212 is provided with clamp arm mounting platform 2121 and clamp arm installation through-hole 2122, and opposite side is set It is equipped with the first sliding groove 2124 for adjusting 21 position of V-type clamp system and for V-type clamp system 21 to be installed on vertical cunning Second sliding slot 2123 on bar 22.Clamp arm 211 and anti-transfer gasket 213 are installed on the folder of slide guide frame 212 by nut bolt At tight arm mounting platform 2121, anti-transfer gasket 213 is installed among a pair of of clamp arm 211.
Sliding groove 221 is provided on upright sliding bar 22;Slide guide frame 212 is installed on the cunning of upright sliding bar 22 by nut bolt On dynamic slot 221, so as to fulfill the whole slip, adjustment and positioning in upper-lower height direction of V-type clamp system 21.Upright sliding bar 22 Bottom be provided with the 11 corresponding sliding block of the first T shapes sliding slot on bottom plate 1, so as to fulfill upright sliding bar 22 in the lateral direction Slip.
U-type groove 231 is provided on U-shaped mounting bracket 23, slide guide frame 212 is connect by nut bolt with U-type groove 231, so as to Adjust the claming angle of V-type clamp system 21 and variable cross-section section thin-wall tube, make V-type clamp system 21 to variable cross-section section thin-wall tube into Row effectively clamping.U-shaped mounting bracket 23 is provided at both ends with U-shaped mounting bracket mounting platform 232, and it is vertical to be mounted on by nut bolt On slide bar 22.
The second rubber antiskid pad 311 is provided on the surface of the close straightway thin-wall tube of L-type grip slide 31, to increase Friction, and avoid crushing thin-wall tube;The other end of L-type grip slide 31 is provided with mounting platform 312 and installation through-hole 313, L-type Grip slide 31 is installed on by nut bolt in the 2nd T shapes sliding slot 12 on bottom plate 1.
The first through hole slot 13 of positioning is additionally provided on bottom plate 1, first through hole slot 13 is set to the first T shapes sliding slot 11 Lower part, and connected with the first T shapes sliding slot 11, the second through-hole groove 14 of positioning is additionally provided on bottom plate 1, the second through-hole groove 14 is set The lower part of the 2nd T shapes sliding slot 12 is placed in, and is connected with second sliding slot 12.
When it is implemented, before welding, variable cross-section section thin-wall tube 41 and straightway thin-wall tube 42 are pre-processed respectively.Peace During dress, straightway thin-wall tube 43 is first placed center with bottom plate 1 by the first step, completes just to position.Second step installs straightway Second clamp module 3 of thin-wall tube.Several L-type grip slides 31 are mounted in the 2nd T shapes sliding slot 12 of bottom plate 1, it is just fixed Position, and L-type grip slide 31 by nut bolt is pre-tightened and is mounted in the 2nd T shapes sliding slot 12.Third walks, and installs variable cross-section section First clamp module 2 of thin-wall tube.Upright sliding bar 22 by sliding block is slipped into, is installed to corresponding first T shape sliding slots on bottom plate 1 In 11, positioned with bolt and nut in the precalculated position of pedestal 1 by 13 pre-screwing of first through hole slot.Then by V-type clamp system 21st, U-shaped mounting bracket 23 is mounted on upright sliding bar 22, is positioned by nut bolt pre-screwing.4th step, installation variable cross-section section are thin Wall pipe 42.V-type clamp system 21 is adjusted to suitable position, variable cross-section section thin-wall tube is installed, then adjusts variable cross-section section thin-walled The height of pipe 42 makes the welding portion of variable cross-section section thin-wall tube 42 downward, and is overlapped with the welding portion of straightway thin-wall tube 41, After the completion of 5th step, straightway thin-wall tube 41 and variable cross-section section thin-wall tube 42 all position, all clampings, location structure are twisted Tightly, to complete last clamping.Later, you can carry out the welding processing of thin-walled varying cross-section duct.
It will appreciated by the skilled person that the foregoing is merely the preferred embodiment of invention, it is not used to limit System invention, although invention is described in detail with reference to previous examples, for those skilled in the art, still It can modify to the technical solution of aforementioned each case history or equivalent replacement is carried out to which part technical characteristic.It is all Within the spirit and principle of invention, modification, equivalent replacement for being made etc. should be included within the protection domain of invention.

Claims (10)

1. a kind of clamping device of thin-walled varying cross-section duct, which is characterized in that the clamping device includes bottom plate (1) and mounted on institute On the bottom plate (1) stated for clamping the first clamp module (2) of variable cross-section section thin-wall tube and for clamping straightway thin-wall tube The second clamp module (3);
The first sliding groove (11) for installing the first clamp module (2) is provided on the bottom plate (1) and for installing second The second sliding slot (12) of clamp module (3), first clamp module (2) include V-type clamp system (21), upright sliding bar (22) it is installed in the first sliding groove (11) with U-shaped mounting bracket (23), the upright sliding bar (22), the U-shaped peace It shelves (23) to be fixed on the upright sliding bar (22), described V-type clamp system (21) one end is connected to described vertical On slide bar (22), middle part is connected on the U-shaped mounting bracket (23), and the V-type pawl of the V-type clamp system (21) is used to press from both sides Hold the periphery of the variable cross-section section thin-wall tube.
Second clamp module (3) includes several grip slides (31), and the grip slide (31) is mounted on described Second sliding slot (12), for clamping the straightway thin-wall tube.
2. the clamping device of thin-walled varying cross-section duct according to claim 1, which is characterized in that the V-type clamp system (21) including the adjustable clamp arm of a pair of of angle (211), slide guide frame (212) and anti-transfer gasket (213), the slide guide frame (212) one end is provided with clamp arm mounting platform (2121) and installation through-hole (2122), the clamp arm (211), it is anti-with Turn gasket (213) to be fixedly connected in the installation through-hole (2122) of one end of the slide guide frame (212), and it is described it is anti-with It is intermediate mounted on a pair of of clamp arm (211) to turn gasket (213).
3. the clamping device of thin-walled varying cross-section duct according to claim 1, which is characterized in that the slide guide frame (212) On be additionally provided with the first sliding groove (2124) for adjusting V-type clamp system (21) position and for by V-type clamp system (21) The second sliding slot (2123) being installed on the upright sliding bar (22) is provided with U-type groove on the U-shaped mounting bracket (23) (231), sliding groove (221) is provided on the upright sliding bar (22), fixing device passes through the first sliding groove (2124) The V-type clamp system (21) is fixedly connected with U-shaped mounting bracket (23) with the U-type groove (231), the vertical cunning Bar (22) passes through fixing device by the V-type clamp system (21) and described across the second sliding slot (2123) Upright sliding bar (22) is fixedly connected.
4. the clamping device of thin-walled varying cross-section duct according to claim 1, which is characterized in that the clamp arm (211) Clamping on the inside of be provided with rubber antiskid pad (2111), outside is set as hollow structure (2112).
5. the clamping device of thin-walled varying cross-section duct according to claim 1, which is characterized in that the first sliding groove (11) It is T-slot with second sliding slot (12).
6. the clamping device of thin-walled varying cross-section duct according to claim 5, which is characterized in that the upright sliding bar (22) Bottom be provided with sliding block corresponding with the first sliding groove (11).
7. the clamping device of thin-walled varying cross-section duct according to claim 1, which is characterized in that second clamp module (3) grip slide (31) is L-type grip slide, and the grip slide (31) is close to the surface of the straightway thin-wall tube On be provided with rubber antiskid pad (311), the other end of the L-type grip slide (31) is provided with mounting platform (312) and peace Through-hole (313) is filled, the L-type grip slide (31) is installed on the second sliding slot on the bottom plate (1) by fixing device (12) in.
8. the clamping device of thin-walled varying cross-section duct according to claim 1, which is characterized in that on the bottom plate (1) also The first through hole slot (13) of positioning is provided with, the first through hole slot (13) is set under the first sliding groove (11) Portion, and connected with the first sliding groove (11), the second through-hole groove (14) of positioning is additionally provided on the bottom plate (1), Second through-hole groove (14) is set to the lower part of the second sliding slot (12), and with the second sliding slot (12) even It is logical.
9. the clamping device of thin-walled varying cross-section duct according to claim 8, which is characterized in that the first sliding groove (11), second sliding slot (12), first through hole slot (13) and the second through-hole groove (14) are multiple, and on the bottom plate (1) It is uniformly distributed.
10. the clamping device of the thin-walled varying cross-section duct according to claim 3 or 7, which is characterized in that the fixing device For bolt and nut.
CN201810084463.9A 2018-01-29 2018-01-29 Clamping device for thin-wall variable-section pipe Active CN108188649B (en)

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
CN109141335A (en) * 2018-10-11 2019-01-04 浙江工业大学之江学院 A kind of device for fast detecting of the continuous bend pipe in space
CN109623187A (en) * 2019-01-02 2019-04-16 江苏新天宝机械有限公司 A kind of cylinder closes up seam welding device
CN109648238A (en) * 2018-12-25 2019-04-19 安徽惠宁进出口有限公司 A kind of electric kettle production work platform
CN109823652A (en) * 2019-03-25 2019-05-31 深圳市高能精密机械有限公司 Compatible heterogenous stator heating jacket supply tray and stator positioning device
CN110899908A (en) * 2019-12-13 2020-03-24 嘉兴锐视智能科技有限公司 Robot welding seam tracking laser visual detection device
CN112453714A (en) * 2020-12-07 2021-03-09 重庆康斯顿激光科技股份有限公司 Laser marking machine convenient to operation
CN113399915A (en) * 2021-07-12 2021-09-17 中国石油化工股份有限公司 Non-power-driven fire replacement tool for field oil transportation special-shaped pipe section and off-site prefabricating method

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CN204997249U (en) * 2015-06-02 2016-01-27 中山亚力菲自动化设备有限公司 Square sealing of tube machine
CN106493501A (en) * 2016-10-31 2017-03-15 亿和精密工业(苏州)有限公司 Pipe fitting welding tool and welding method
CN208005093U (en) * 2018-01-29 2018-10-26 浙江工业大学 A kind of clamping device of thin-walled varying cross-section duct

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CN103029115A (en) * 2013-01-08 2013-04-10 南通市建筑科学研究院有限公司 Line marker for test of thermoplastic plastics pipes
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109141335A (en) * 2018-10-11 2019-01-04 浙江工业大学之江学院 A kind of device for fast detecting of the continuous bend pipe in space
CN109648238A (en) * 2018-12-25 2019-04-19 安徽惠宁进出口有限公司 A kind of electric kettle production work platform
CN109648238B (en) * 2018-12-25 2021-02-19 安徽惠宁进出口有限公司 Electric kettle production work platform
CN109623187A (en) * 2019-01-02 2019-04-16 江苏新天宝机械有限公司 A kind of cylinder closes up seam welding device
CN109623187B (en) * 2019-01-02 2020-09-04 江苏新天宝机械有限公司 Barrel folds seam group to welding set
CN109823652A (en) * 2019-03-25 2019-05-31 深圳市高能精密机械有限公司 Compatible heterogenous stator heating jacket supply tray and stator positioning device
CN110899908A (en) * 2019-12-13 2020-03-24 嘉兴锐视智能科技有限公司 Robot welding seam tracking laser visual detection device
CN112453714A (en) * 2020-12-07 2021-03-09 重庆康斯顿激光科技股份有限公司 Laser marking machine convenient to operation
CN112453714B (en) * 2020-12-07 2022-11-25 重庆康斯顿激光科技股份有限公司 Laser marking machine convenient to operation
CN113399915A (en) * 2021-07-12 2021-09-17 中国石油化工股份有限公司 Non-power-driven fire replacement tool for field oil transportation special-shaped pipe section and off-site prefabricating method

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CN108188649B (en) 2024-03-22

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