CN110000504A - A kind of welding platform with adjustable apparatus - Google Patents
A kind of welding platform with adjustable apparatus Download PDFInfo
- Publication number
- CN110000504A CN110000504A CN201910407669.5A CN201910407669A CN110000504A CN 110000504 A CN110000504 A CN 110000504A CN 201910407669 A CN201910407669 A CN 201910407669A CN 110000504 A CN110000504 A CN 110000504A
- Authority
- CN
- China
- Prior art keywords
- cylindrical tube
- face
- welded
- welding platform
- locking mechanism
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 52
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 79
- 229910052742 iron Inorganic materials 0.000 claims description 38
- 229910000831 Steel Inorganic materials 0.000 abstract description 12
- 239000010959 steel Substances 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
- B23K37/0443—Jigs
-
- 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
- B23K37/0461—Welding tables
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention provides a kind of welding platform with adjustable apparatus, including fixed plate, locking mechanism and cone tank；The fixed plate top end face rearward position is welded with a bonding machine mounting base；The clamping fixture seat top end face is welded with a fixed cylindrical tube, and a cylindrical tube is rotatably connected in the fixed cylindrical tube；There are six gripper jaws structures for the cylinder pipe outer wall right positions rectangular array shape elasticity setting.Because locking mechanism front end face offers a cone tank, therefore in rotation lock structure, locking mechanism, which can gradually oppress gripper jaws structure and move inward, is clamped steel cylindrical tube, it compares with existing apparatus, the mode that is fixedly clamped of the present apparatus, on the one hand, it can be achieved that being fixedly clamped to different-diameter cylindrical tube；On the other hand, present apparatus method when being fixedly clamped is relatively simple quick, and practicability is higher.
Description
Technical field
The invention belongs to welding processing platform technology fields, more specifically, in particular to a kind of to have adjustable apparatus
Welding platform.
Background technique
Pipeline is to require to be welded substantially in construction, reaches required installation effect and installation length with this, therefore
Require to be grouped, weld operation substantially in pipeline construction, conventional group to, welding be all on the ground or on step it is complete
Pipe is fixed at one people when, operation, people's counterpart, people's spot welding, at least needs three people that could complete group pair.
Such as application number: CN201620623077.9, the invention discloses a kind of processing platform, especially a kind of pipeline group
To, welding platform.The present invention provides a kind of pipe strings for avoiding pipeline from shaking, welding platform, including support column, station
And clamping device, the station are arranged on the support column, the clamping device includes positioning seat and clamping device, the positioning
Seat is arranged on station and is located on the surrounding side wall of station, and the clamping head of the clamping device is corresponding with positioning seat.
By the way that clamping device is arranged on the side wall of station, pipeline can be fixed on the side wall of station, so that pipeline is hanging
It is fixed, to facilitate group to, welding.In small-bore pipeline group to being operated in, welding platform, small-bore pipeline can be rotated and be welded
It connects, so reducing operation difficulty.It can achieve oneself ideal welding position after rotation, even more raising welding quality.
Based on to application number: CN201620623077.9, although pipeline can be carried out being suspended vacantly realization conveniently by this application
Docking, but there are still following deficiencies: one is that welding efficiency is higher, above-mentioned application be by the mounting rack of lower section and
Pipeline is fixed in angle adjustment device, but side welding edge is needed to rotate cylinder when welding to cylindrical pipe
Pipe carries out annular solder to two cylindrical tubes, and above-mentioned apparatus can not rotate the cylindrical tube for needing to weld while welding, and
That elastic fixed structure is needed repeatedly to carry out axial rotation cylindrical tube to realize the welding at remaining position, just affect welding
Efficiency；Furthermore be that adjustability is poor, above-mentioned apparatus mounting rack, which is fixedly connected on, to be not available for adjusting on station, when two compared with
When being welded between short pipeline, above-mentioned apparatus will can not achieve fixation.
Then, it in view of this, being studied improvement for existing structure and missing, provides a kind of with adjustable apparatus
Welding platform, to achieve the purpose that with more more practical value.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of welding platforms with adjustable apparatus, existing to solve
One is that welding efficiency is higher, and above-mentioned application is that pipeline is fixed by the mounting rack and angle adjustment device of lower section,
But side welding edge is needed to rotate cylindrical tube when welding to cylindrical pipe, annular solder is carried out to two cylindrical tubes,
Above-mentioned apparatus can not rotate the cylindrical tube for needing to weld while welding, but elastic fixed structure is needed repeatedly to carry out axis
The welding at remaining position is realized to rotation cylindrical tube, just affect the efficiency of welding；Furthermore it is that adjustability is poor, it is above-mentioned
Device mounting rack, which is fixedly connected on, to be not available for adjusting on station, above-mentioned when being welded between two shorter pipelines
Device will can not achieve fixed problem.
The present invention is used for the purpose and effect of a kind of welding platform with adjustable apparatus, by technological means in detail below
Reached:
A kind of welding platform with adjustable apparatus, including fixed plate, trapezoidal slide post, bonding machine mounting base, clamping fixture seat, ladder
Shape slot, cylindricality iron, fixed cylindrical tube, cylindrical tube, gripper jaws structure, clamp rod, clamp head, buting iron, spring, irony ball, lock
Locking structure and cone tank；The fixed plate top end face rearward position is welded with a bonding machine mounting base；The clamping fixture seat top
Face is welded with a fixed cylindrical tube, and a cylindrical tube is rotatably connected in the fixed cylindrical tube；The cylinder pipe outer wall
There are six gripper jaws structures for the setting of right positions rectangular array shape elasticity.
Further, fixed plate top end face center is welded with a trapezoidal slide post, and the trapezoidal sliding
Symmetrically being slidably connected on column, there are two clamping fixture seats.
Further, the front end face of each clamping fixture seat and rear end face are symmetrically welded with two blocks of cylindricality iron, and described
Cylindricality iron bottom face is in contact with fixed plate top end face, and the cylindricality iron is trapezoidal rod structure.
Further, the gripper jaws structure is made of clamp rod, clamp head, buting iron, spring and irony ball；The folder
Tool bar is slidably connected to cylinder pipe outer wall, and the clamp rod is rectangle rod structure.
Further, the clamp rod bottom face is welded with a clamp head, and the clamp head bottom face offers one
A triangle cylindrical groove.
Further, the clamp rod outer wall is welded with a buting iron, and the clamp rod outer wall is located at buting iron and cylinder
A spring is also socketed between pipe, and the clamp rod top end face is welded with an irony ball.
Further, the cylinder pipe outer wall offers screw thread, and the locking mechanism is threadedly connected in cylindrical tube；Institute
Stating locking mechanism is ladder tubular structure, and the locking mechanism front end face offers a cone tank.
Compared with prior art, the invention has the following beneficial effects:
Because offering a cone tank because of locking mechanism front end face, therefore in rotation lock structure, locking mechanism can be oppressed gradually
Gripper jaws structure, which moves inward, is clamped steel cylindrical tube, compares with existing apparatus, the mode that is fixedly clamped of the present apparatus,
On the one hand, it can be achieved that being fixedly clamped to different-diameter cylindrical tube；On the other hand, present apparatus method when being fixedly clamped is more simple
Just quick, practicability is higher.
Because the front end face and rear end face of each clamping fixture seat are symmetrically welded with two blocks of cylindricality iron, and cylindricality iron bottom face and solid
Fixed board top end face is in contact, and cylindricality iron is triangle rod structure, therefore in mobile fixture seat, the cylindricality iron of triangle rod structure can
The disintegrating slag that welding generates is rooted out in the process of moving, is compared with existing apparatus, present apparatus structure is more reasonable and failure
The low iron filings for preventing welding from generating of rate are stuck by clamping fixture seat.
Because cylindrical tube is rotationally connected in fixed cylindrical tube, in welding, steel pipe can be realized by rotation cylindrical tube
Rotation welding, therefore the convenience of steel cylindrical tube welding can be improved and improve welding efficiency.
Detailed description of the invention
Fig. 1 is axis view structural schematic diagram of the invention.
Fig. 2 is axis view structural schematic diagram of the invention.
Fig. 3 is the axis view amplification knot of present clip seat, fixed cylindrical tube, cylindrical tube, gripper jaws structure and locking mechanism
Structure schematic diagram.
Fig. 4 is enlarged structure schematic diagram at the A of Fig. 3 of the present invention.
Fig. 5 is the axis view fractionation structural representation of Fig. 3 of the present invention.
Fig. 6 is the schematic cross-sectional view of Fig. 3 of the present invention.
Fig. 7 is enlarged structure schematic diagram at the B of Fig. 6 of the present invention.
In figure, the corresponding relationship of component names and accompanying drawing number are as follows:
1, fixed plate；101, trapezoidal slide post；2, bonding machine mounting base；3, clamping fixture seat；301, dovetail groove；302, cylindricality iron；4,
Fixed cylindrical tube；5, cylindrical tube；6, gripper jaws structure；601, clamp rod；602, clamp head；603, buting iron；604, spring；605,
Irony ball；7, locking mechanism；701, cone tank (701).
Specific embodiment
Embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples.Following embodiment is used for
Illustrate the present invention, but cannot be used to limit the scope of the invention.
In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or more；Term " on ",
The orientation or positional relationship of the instructions such as "lower", "left", "right", "inner", "outside", " front end ", " rear end ", " head ", " tail portion " is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second ", " third " etc. are used for description purposes only, and should not be understood as instruction or
Imply relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " connected " " connects
Connect " it shall be understood in a broad sense, for example, it may be being fixedly connected, it may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, it can also be indirectly connected through an intermediary.For this field
For those of ordinary skill, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
Embodiment:
As shown in attached drawing 1 to attached drawing 7:
The present invention provides a kind of welding platform with adjustable apparatus, including fixed plate 1, trapezoidal slide post 101, bonding machine peace
Fill seat 2, clamping fixture seat 3, dovetail groove 301, cylindricality iron 302, fixed cylindrical tube 4, cylindrical tube 5, gripper jaws structure 6, clamp rod 601,
Clamp head 602, buting iron 603, spring 604, irony ball 605, locking mechanism 7 and cone tank 701；1 top end face of fixed plate
Rearward position is welded with a bonding machine mounting base 2；3 top end face of clamping fixture seat is welded with a fixed cylindrical tube 4, and described
A cylindrical tube 5 is rotatably connected in fixed cylindrical tube 4；The 5 outer wall right positions rectangular array shape elasticity of cylindrical tube is set
Gripper jaws structure 6 there are six setting.
With reference to such as Fig. 1, the 1 top end face center of fixed plate is welded with a trapezoidal slide post 101, and described trapezoidal
Symmetrically being slidably connected on slide post 101, there are two clamping fixture seats 3, therefore exist when carrying out pipeline welding by adjusting the clamping fixture seat 3
Left-right position on trapezoidal slide post 101 can realize the docking and welding of different length pipeline.
With reference to such as Fig. 3 and Fig. 4, the front end face and rear end face of each clamping fixture seat 3 are symmetrically welded with two blocks of cylindricality iron
302, and 302 bottom face of cylindricality iron is in contact with 1 top end face of fixed plate, and the cylindricality iron 302 is trapezoidal rod structure,
Therefore in the movement clamping fixture seat 3, the cylindricality iron 302 of triangle rod structure can shovel in the process of moving the disintegrating slag that welding generates
It removes, the iron filings that can prevent welding from generating are stuck by clamping fixture seat 3.
With reference to such as Fig. 7, the gripper jaws structure 6 is by clamp rod 601, clamp head 602, buting iron 603, spring 604 and irony
Ball 605 forms；The clamp rod 601 is slidably connected to 5 outer wall of cylindrical tube, and the clamp rod 601 is rectangle rod structure, therefore
It can prevent that axial rotation occurs when the clamp rod 601 slides up and down, cause the clamp head 602 cannot preferably and pipeline
Surface contact.
With reference to such as Fig. 7,601 bottom face of clamp rod is welded with a clamp head 602, and 602 bottom end of the clamp head
Face offers a triangle cylindrical groove, therefore can enhance the stability that the clamp head 602 is contacted with pipe surface.
With reference to such as Fig. 7,601 outer wall of clamp rod is welded with a buting iron 603, and 601 outer wall of the clamp rod is located at
A spring 604 is also socketed between buting iron 603 and cylindrical tube 5, and 601 top end face of the clamp rod is welded with an irony
Ball 605, therefore the flatness that the gripper jaws structure 6 rubs with locking mechanism 7 can be enhanced.
With reference to such as Fig. 6,5 outer wall of cylindrical tube offers screw thread, and the locking mechanism 7 is threadedly connected to cylindrical tube 5
On；The locking mechanism 7 is ladder tubular structure, and 7 front end face of the locking mechanism offers a cone tank 701, therefore
When rotating the locking mechanism 7, the locking mechanism 7, which can gradually oppress gripper jaws structure 6 and move inward, clamps cylindrical tube, uses
It is fixedly clamped with realizing to different-diameter cylindrical tube.
The specifically used mode and effect of the present embodiment:
In use, two steel cylindrical tubes welded will be needed to be separately fixed in two cylindrical tubes 5, method is, by cylinder
Shape steel pipe is inserted into cylindrical tube 5, then tightens locking mechanism 7, when tightening locking mechanism 7, because 7 front end face of locking mechanism is opened
Equipped with a cone tank 701, therefore in rotation lock structure 7, locking mechanism 7 can gradually oppress gripper jaws structure 6 and move inward
Steel cylindrical tube is clamped, such mode that is fixedly clamped is fixedly clamped to different-diameter cylindrical tube to realize；
After two steel cylindrical tubes fix, unscrew the fixing bolt on clamping fixture seat 3, two clamping fixture seats 3 are moved inward until
Two steel cylindrical tubes are in contact, and finally tighten the fixing bolt on two clamping fixture seats 3 again, complete at this time to two cylinders
The fixation work of shape steel pipe；
In welding, it can realize that the rotation of steel pipe is welded by rotation cylindrical tube 5, therefore the side of steel cylindrical tube welding can be improved
Just property and raising welding efficiency.
Because the front end face and rear end face of each clamping fixture seat 3 are symmetrically welded with two blocks of cylindricality iron 302, and 302 bottom of cylindricality iron
End face is in contact with 1 top end face of fixed plate, and cylindricality iron 302 is triangle rod structure, therefore in mobile fixture seat 3, triangular prism
The cylindricality iron 302 of structure can root out in the process of moving the disintegrating slag that welding generates, and the iron filings that can prevent welding from generating will press from both sides
It is stuck to have seat 3.
The embodiment of the present invention is given for the purpose of illustration and description, and is not exhaustively or by this to send out
It is bright to be limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Choosing
Selecting and describe embodiment is and to make those skilled in the art to more preferably illustrate the principle of the present invention and practical application
It will be appreciated that the present invention is to design various embodiments suitable for specific applications with various modifications.
Claims (7)
1. a kind of welding platform with adjustable apparatus, it is characterised in that: including, fixed plate (1), trapezoidal slide post (101),
Bonding machine mounting base (2), clamping fixture seat (3), dovetail groove (301), cylindricality iron (302), fixed cylindrical tube (4), cylindrical tube (5), folder
Have pawl structure (6), clamp rod (601), clamp head (602), buting iron (603), spring (604), irony ball (605), locking knot
Structure (7) and cone tank (701)；Fixed plate (1) the top end face rearward position is welded with a bonding machine mounting base (2)；It is described
Clamping fixture seat (3) top end face is welded with a fixed cylindrical tube (4), and is rotatably connected to a circle in the fixed cylindrical tube (4)
Column tube (5)；There are six gripper jaws structure (6) for cylindrical tube (5) the outer wall right positions rectangular array shape elasticity setting.
2. as described in claim 1 for the welding platform with adjustable apparatus, it is characterised in that: fixed plate (1) top
End face center position is welded with a trapezoidal slide post (101), and symmetrically slidably connects two on the trapezoidal slide post (101)
A clamping fixture seat (3).
3. as described in claim 1 for the welding platform with adjustable apparatus, it is characterised in that: each clamping fixture seat
(3) front end face and rear end face is symmetrically welded with two pieces of cylindricality iron (302), and cylindricality iron (302) bottom face and fixation
Plate (1) top end face is in contact, and the cylindricality iron (302) is trapezoidal rod structure.
4. as described in claim 1 for the welding platform with adjustable apparatus, it is characterised in that: the gripper jaws structure
(6) it is made of clamp rod (601), clamp head (602), buting iron (603), spring (604) and irony ball (605)；The fixture
Bar (601) is slidably connected to cylindrical tube (5) outer wall, and the clamp rod (601) is rectangle rod structure.
5. as described in claim 1 for the welding platform with adjustable apparatus, it is characterised in that: the clamp rod (601)
Bottom face is welded with a clamp head (602), and the clamp head (602) bottom face offers a triangle cylindrical groove.
6. as described in claim 1 for the welding platform with adjustable apparatus, it is characterised in that: the clamp rod (601)
Outer wall is welded with a buting iron (603), and the clamp rod (601) outer wall is located between buting iron (603) and cylindrical tube (5) and also covers
It is connected to a spring (604), and the clamp rod (601) top end face is welded with an irony ball (605).
7. as described in claim 1 for the welding platform with adjustable apparatus, it is characterised in that: the cylindrical tube (5) is outside
Wall offers screw thread, and the locking mechanism (7) is threadedly connected on cylindrical tube (5)；The locking mechanism (7) is ladder tubulose
Structure, and the locking mechanism (7) front end face offers a cone tank (701).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910407669.5A CN110000504A (en) | 2019-05-15 | 2019-05-15 | A kind of welding platform with adjustable apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910407669.5A CN110000504A (en) | 2019-05-15 | 2019-05-15 | A kind of welding platform with adjustable apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110000504A true CN110000504A (en) | 2019-07-12 |
Family
ID=67177178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910407669.5A Pending CN110000504A (en) | 2019-05-15 | 2019-05-15 | A kind of welding platform with adjustable apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110000504A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110814417A (en) * | 2019-11-21 | 2020-02-21 | 倪树华 | Square pipe surrounding type cutting equipment |
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|---|---|---|---|---|
| WO1998003310A1 (en) * | 1996-07-23 | 1998-01-29 | Mcdonnell Douglas Corporation | Tube welding fixture and heat shield |
| CN202240322U (en) * | 2011-06-28 | 2012-05-30 | 中国石油天然气集团公司 | Tube material supporting device for welding test |
| CN203820832U (en) * | 2014-05-15 | 2014-09-10 | 武汉钢铁(集团)公司 | Slag push device for converter slag car |
| CN104708263A (en) * | 2015-01-30 | 2015-06-17 | 无锡昊瑜节能环保设备有限公司 | Clamp of welding platform for welding between pipelines |
| CN105826713A (en) * | 2016-01-15 | 2016-08-03 | 胡小青 | Electric power fitting having double clamping effects |
| CN207272490U (en) * | 2017-08-29 | 2018-04-27 | 青岛海洋热电化工设备有限公司 | A kind of repeatable welding tooling utilized |
| CN109268602A (en) * | 2018-04-30 | 2019-01-25 | 中山市道格装饰设计工程有限公司 | A kind of sealing device of quick locking |
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| CN210172886U (en) * | 2019-05-15 | 2020-03-24 | 贵州大学 | Welding platform with adjustable device |
-
2019
- 2019-05-15 CN CN201910407669.5A patent/CN110000504A/en active Pending
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|---|---|---|---|---|
| WO1998003310A1 (en) * | 1996-07-23 | 1998-01-29 | Mcdonnell Douglas Corporation | Tube welding fixture and heat shield |
| CN202240322U (en) * | 2011-06-28 | 2012-05-30 | 中国石油天然气集团公司 | Tube material supporting device for welding test |
| CN203820832U (en) * | 2014-05-15 | 2014-09-10 | 武汉钢铁(集团)公司 | Slag push device for converter slag car |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110814417A (en) * | 2019-11-21 | 2020-02-21 | 倪树华 | Square pipe surrounding type cutting equipment |
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