CN107052555A - A kind of mechanical tensioning device - Google Patents
A kind of mechanical tensioning device Download PDFInfo
- Publication number
- CN107052555A CN107052555A CN201710010625.XA CN201710010625A CN107052555A CN 107052555 A CN107052555 A CN 107052555A CN 201710010625 A CN201710010625 A CN 201710010625A CN 107052555 A CN107052555 A CN 107052555A
- Authority
- CN
- China
- Prior art keywords
- block
- end cap
- connecting shaft
- fixed
- fixed end
- 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.)
- Granted
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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
- B23K15/00—Electron-beam welding or cutting
- B23K15/0013—Positioning or observing workpieces, e.g. with respect to the impact; Aligning, aiming or focusing electronbeams
-
- 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
- B23K15/00—Electron-beam welding or cutting
- B23K15/04—Electron-beam welding or cutting for welding annular seams
-
- 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
- B23K15/00—Electron-beam welding or cutting
- B23K15/06—Electron-beam welding or cutting within a vacuum chamber
-
- 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
- B23K37/0531—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 internal pipe alignment clamps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
Abstract
The invention discloses a kind of mechanical tensioning device, including tension base, fixed end cap one, screw rod, boss, internal thread, nut seat, cone, guide pillar, lateral connection block, fixed block, connecting shaft, fixture, spring, fixed end cap two, external screw thread, adapter sleeve, groove fixture block and operating parts；The present invention has simple, production cost rational in infrastructure low, easy for installation, multiple functional, and the present invention is provided with fixed block, and T-slot is provided with the top of fixed block, bottom is provided with T-shaped block, is used so as to which effectively fixed block stacks up, it is ensured that the need for different size cylinder tensioner；Adapter sleeve is provided with addition, when barrel lenght is longer, this swelling device can effectively be sent to the position of needs by adapter sleeve, then rotary operating member can carry out tensioner to cylinder, so as to facilitate the use of workman.
Description
Technical field
The present invention relates to a kind of swelling device, more particularly to a kind of mechanical tensioning device.
Background technology
Two sections of cylinders need the simplified inwall tensioner in joint to hold round in butt welding, to control weldquality.Certain
Simplified use vacuum electron beam welding technique, such as application hydraulic pressure or Pneumatic expanded device are when vacuumizing probably due to environmental pressure
Drastically change influence device swelling effect, and liquid, gas medium once occur leakage be likely to result in welding failure, zero
Part such as scraps at the serious consequence；And existing swelling device is cumbersome when using, swelling device tensioner scope is also smaller in addition.
The content of the invention
The purpose of the present invention is that provides a kind of mechanical tensioning device to solve the above problems, and solves and shows
Some swelling devices are cumbersome when using, and swelling device tensioner scope is also smaller in addition.
In order to solve the above problems, the invention provides a kind of technical scheme：A kind of mechanical tensioning device, its innovative point
It is：Including tension base, fixed end cap one, screw rod, boss, internal thread, nut seat, cone, guide pillar, lateral connection block, fixation
Block, connecting shaft, fixture, spring, fixed end cap two, external screw thread, adapter sleeve, groove fixture block and operating parts；In the tension base
Portion's left end is fixedly connected with right-hand member inside fixed end cap one, the tension base and is fixedly connected with fixed end cap two；The screw rod position
Inside tension base, the screw rod is movably connected between the fixed end cap two of fixed end cap one and center, living above the screw rod
It is dynamic to be connected with nut seat；The nut seat is fixedly connected on cone center of inside；Described cone or so is movably connected in tension base
It is internal；The connecting shaft is several, and the connecting shaft is movably connected on the outside of tension base in medium pore by fixture respectively, institute
State connecting shaft bottom surface with cone surface to be connected, be equipped with the downside of the connecting shaft between step surface and the fixture bottom surface
Spring；The guide pillar is several, and the guide pillar is located on the downside of connecting shaft both sides, the guide pillar respectively is movably connected in tensioner
In the two side holes of seat outside；The lateral connection block is several, and the lateral connection block bottom center is respectively fixedly connected with connection
At the top of axle, the lateral connection block two bottom sides are fixed on the upside of the lateral connection block to connect respectively with being fixedly connected at the top of guide pillar
It is connected to fixed block；The internal thread is respectively provided in the outside medium pore of fixed end cap one and fixed end cap two, the internal thread
It is connected with external screw thread；The external screw thread be located at adapter sleeve side it is cylindrical on；The adapter sleeve internal activity is connected to groove card
Block；The groove fixture block right-hand member is fixedly connected with operating parts, and the groove fixture block is connected with boss；The boss is respectively provided at
Screw rod two ends.
Preferably, being provided with T-slot at the top of the fixed block, and match with the T-shaped block of bottom.
Preferably, the boss is rectangular block, and match with groove fixture block further groove.
Preferably, the adapter sleeve outer surface is provided with anti-slip veins.
Beneficial effects of the present invention：The present invention has simple, production cost rational in infrastructure low, easy for installation, multiple functional,
The present invention, which is provided with the top of fixed block, and fixed block, is provided with T-slot, and bottom is provided with T-shaped block, so as to effectively by fixed block
Stack up and used, it is ensured that the need for different size cylinder tensioner；Adapter sleeve is provided with addition, when barrel lenght is longer
When, this swelling device can effectively be sent to the position of needs by adapter sleeve, and then rotary operating member can be carried out to cylinder
Tensioner, so as to facilitate the use of workman.
Brief description of the drawings：
For ease of explanation, the present invention is described in detail by following specific implementations and accompanying drawing.
Fig. 1 is structural representation of the invention.
Fig. 2 is side view of the invention.
1- tension bases；2- fixes end cap one；3- screw rods；4- boss；5- internal threads；6- nut seats；7- cones；8- guide pillars；
9- lateral connection blocks；10- fixed blocks；11- connecting shafts；12- fixtures；13- springs；14- fixes end cap two；15- external screw threads；
16- adapter sleeves；17- groove fixture blocks；18- operating parts.
Embodiment：
As depicted in figs. 1 and 2, present embodiment uses following technical scheme：A kind of mechanical tensioning device, including tensioner
Seat 1, fixed end cap 1, screw rod 3, boss 4, internal thread 5, nut seat 6, cone 7, guide pillar 8, lateral connection block 9, fixed block 10,
Connecting shaft 11, fixture 12, spring 13, fixed end cap 2 14, external screw thread 15, adapter sleeve 16, groove fixture block 17 and operating parts 18；
The inside left end of tension base 1 is fixedly connected with fixed end cap 1, and the inside right-hand member of tension base 1 is fixedly connected with fixing end
Lid 2 14；The screw rod 3 is located inside tension base 1, and the screw rod 3 is movably connected in fixed end cap 1 and the fixed end cap in center
Between 2 14, the screw rod 3 is connected with nut seat 6 above；The nut seat 6 is fixedly connected on the center of inside of cone 7；Institute
Cone 7 or so is stated to be movably connected in inside tension base 1；The connecting shaft 11 is several, and the connecting shaft 11 passes through fixation respectively
Part 12 is movably connected in the outside medium pore of tension base 1, and the bottom surface of connecting shaft 11 is connected with the surface of cone 7, the company
Spring 13 is equipped between the downside step surface of spindle 11 and the bottom surface of the fixture 12；The guide pillar 8 be several, the guide pillar
8 are located at the both sides of connecting shaft 11 respectively, and the downside of guide pillar 8 is movably connected in the outside two side holes of tension base 1；The transverse direction connects
It is several to connect block 9, and the bottom center of lateral connection block 9 is respectively fixedly connected with the top of connecting shaft 11, the lateral connection block 9
Two bottom sides are fixedly connected with the top of guide pillar 8 respectively, and the upside of lateral connection block 9 is fixedly connected with fixed block 10；In described
Screw thread 5 is respectively provided in the outside medium pore of fixed end cap 1 and fixed end cap 2 14, the internal thread 5 and the phase of external screw thread 15
Connection；The external screw thread 15 be located at the side of adapter sleeve 16 it is cylindrical on；The internal activity of adapter sleeve 16 is connected to groove fixture block 17；
The right-hand member of groove fixture block 17 is fixedly connected with operating parts 18, and the groove fixture block 17 is connected with boss 4；4 points of the boss
The two ends of screw rod 3 are not located at.
Wherein, the top of fixed block 10 is provided with T-slot, and matches with the T-shaped block of bottom；The boss 4 is rectangle
Block, and match with the further groove of groove fixture block 17；The outer surface of adapter sleeve 16 is provided with anti-slip veins.
The present invention use state be：The present invention is low, easy for installation with simple, production cost rational in infrastructure, and function is neat
Entirely, the present invention is provided with fixed block 10, and the top of fixed block 10 is provided with T-slot, and bottom is provided with T-shaped block, so as to effective
Fixed block 10 is stacked up and used, it is ensured that the need for different size cylinder tensioner；Adapter sleeve 16 is provided with addition, when
When barrel lenght is longer, this swelling device can effectively be sent to the position of needs by adapter sleeve 16, then rotary operating member
18 can carry out tensioner to cylinder, so as to facilitate the use of workman.
The general principle and principal character and advantages of the present invention of the present invention, the technology of the industry has been shown and described above
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention, the claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (4)
1. a kind of mechanical tensioning device, it is characterised in that：Including tension base（1）, fixed end cap one（2）, screw rod（3）, boss
（4）, internal thread（5）, nut seat（6）, cone（7）, guide pillar（8）, lateral connection block（9）, fixed block（10）, connecting shaft（11）、
Fixture（12）, spring（13）, fixed end cap two（14）, external screw thread（15）, adapter sleeve（16）, groove fixture block（17）And operating parts
（18）；
The tension base（1）Internal left end is fixedly connected with fixed end cap one（2）, the tension base（1）Internal right-hand member, which is fixed, to be connected
It is connected to fixed end cap two（14）；
The screw rod（3）Positioned at tension base（1）Inside, the screw rod（3）It is movably connected in fixed end cap one（2）Fixed with center
End cap two（14）Between, the screw rod（3）Nut seat is connected with above（6）；
The nut seat（6）It is fixedly connected on cone（7）Center of inside；
The cone（7）Left and right is movably connected in tension base（1）It is internal；
The connecting shaft（11）For several, the connecting shaft（11）Pass through fixture respectively（12）It is movably connected in tension base（1）
In the medium pore of outside, the connecting shaft（11）Bottom surface is and cone（7）Surface is connected, the connecting shaft（11）Downside step surface
With the fixture（12）Spring is equipped between bottom surface（13）；
The guide pillar（8）For several, the guide pillar（8）It is located at connecting shaft respectively（11）Both sides, the guide pillar（8）Live downside
It is dynamic to be connected to tension base（1）In the two side holes of outside；
The lateral connection block（9）For several, the lateral connection block（9）Bottom center is respectively fixedly connected with connecting shaft（11）
Top, the lateral connection block（9）Two bottom sides respectively with guide pillar（8）Top is fixedly connected, the lateral connection block（9）Upside
It is fixedly connected with fixed block（10）；
The internal thread（5）It is respectively provided at fixed end cap one（2）With fixed end cap two（14）Outside medium pore in, the interior spiral shell
Line（5）With external screw thread（15）It is connected；
The external screw thread（15）It is located at adapter sleeve（16）On side is cylindrical；
The adapter sleeve（16）Internal activity is connected to groove fixture block（17）；
The groove fixture block（17）Right-hand member is fixedly connected with operating parts（18）, the groove fixture block（17）With boss（4）It is connected；
The boss（4）It is respectively provided at screw rod（3）Two ends.
2. a kind of mechanical tensioning device according to claim 1, it is characterised in that：The fixed block（10）Top is provided with
T-slot, and match with the T-shaped block of bottom.
3. a kind of mechanical tensioning device according to claim 1, it is characterised in that：The boss（4）For rectangular block, and
With groove fixture block（17）Further groove matches.
4. a kind of mechanical tensioning device according to claim 1, it is characterised in that：The adapter sleeve（16）On outer surface
Provided with anti-slip veins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710010625.XA CN107052555B (en) | 2017-01-06 | 2017-01-06 | A kind of mechanical tensioning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710010625.XA CN107052555B (en) | 2017-01-06 | 2017-01-06 | A kind of mechanical tensioning device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107052555A true CN107052555A (en) | 2017-08-18 |
| CN107052555B CN107052555B (en) | 2019-03-08 |
Family
ID=59623353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710010625.XA Active CN107052555B (en) | 2017-01-06 | 2017-01-06 | A kind of mechanical tensioning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107052555B (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108087397A (en) * | 2017-12-06 | 2018-05-29 | 昆山恩都照明有限公司 | Metal plate connection structure |
| CN108907599A (en) * | 2018-07-31 | 2018-11-30 | 河南工学院 | Automatic welding device is used in a kind of machining |
| CN108972088A (en) * | 2018-09-27 | 2018-12-11 | 马鞍山常裕机械设备有限公司 | A kind of thin-walled motor shell milling fixture convenient for mounting and clamping |
| CN108971851A (en) * | 2018-08-13 | 2018-12-11 | 繁昌县通民机械制造有限公司 | A kind of article welding fixture |
| CN109500537A (en) * | 2018-12-28 | 2019-03-22 | 徐工消防安全装备有限公司 | Tension tool and tensioner system |
| CN110480445A (en) * | 2019-08-21 | 2019-11-22 | 马鞍山常裕机械设备有限公司 | A kind of deburring equipment for the steering motor shell for preventing from scratching |
| CN110524184A (en) * | 2019-09-20 | 2019-12-03 | 中铁大桥局第七工程有限公司 | A kind of weld fixture apparatus |
| CN110757373A (en) * | 2019-11-22 | 2020-02-07 | 林琳 | Galvanized steel pipe special fixture with inside and outside clamped simultaneously |
| CN110978771A (en) * | 2019-12-21 | 2020-04-10 | 杭州旭美包装制品有限公司 | Stamping machine |
| CN111408893A (en) * | 2020-04-30 | 2020-07-14 | 中国航发哈尔滨东安发动机有限公司 | Self-centering expansion welding fixture |
| CN111547618A (en) * | 2020-04-29 | 2020-08-18 | 江苏盐电阀门有限公司 | Hoisting and conveying device for replacing valve element of large ball valve |
| CN112548801A (en) * | 2020-12-08 | 2021-03-26 | 孟辉 | Alloy valve casting forming process |
| CN112894029A (en) * | 2020-12-10 | 2021-06-04 | 机械科学研究总院青岛分院有限公司 | RV reduction gear machining is with location frock |
| CN113319622A (en) * | 2021-08-03 | 2021-08-31 | 江苏鑫沪莱泵业有限公司 | Positioning fixture for milling end cover of submersible pump |
| CN113681186A (en) * | 2021-08-17 | 2021-11-23 | 上海龙炽机械设备有限公司 | Welding method for rotor of horizontal spiral centrifuge |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201537781U (en) * | 2009-10-23 | 2010-08-04 | 北京星航机电设备厂 | Mechanical tensioning device |
| CN202667952U (en) * | 2012-06-05 | 2013-01-16 | 西安向阳航天材料股份有限公司 | Tension device of sealing weld lining at pipe end of mechanical bimetallic composite pipe |
| CN203541567U (en) * | 2013-11-29 | 2014-04-16 | 山东双轮股份有限公司 | Clamping tool for expansion sleeve type thin-wall outer sleeve |
| CN104128815A (en) * | 2014-07-30 | 2014-11-05 | 张家港化工机械股份有限公司 | Tool for rounding barrel |
| CN105834470A (en) * | 2016-04-29 | 2016-08-10 | 武汉船用机械有限责任公司 | Universal tensioning device for thin-wall rotation type components |
-
2017
- 2017-01-06 CN CN201710010625.XA patent/CN107052555B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201537781U (en) * | 2009-10-23 | 2010-08-04 | 北京星航机电设备厂 | Mechanical tensioning device |
| CN202667952U (en) * | 2012-06-05 | 2013-01-16 | 西安向阳航天材料股份有限公司 | Tension device of sealing weld lining at pipe end of mechanical bimetallic composite pipe |
| CN203541567U (en) * | 2013-11-29 | 2014-04-16 | 山东双轮股份有限公司 | Clamping tool for expansion sleeve type thin-wall outer sleeve |
| CN104128815A (en) * | 2014-07-30 | 2014-11-05 | 张家港化工机械股份有限公司 | Tool for rounding barrel |
| CN105834470A (en) * | 2016-04-29 | 2016-08-10 | 武汉船用机械有限责任公司 | Universal tensioning device for thin-wall rotation type components |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108087397A (en) * | 2017-12-06 | 2018-05-29 | 昆山恩都照明有限公司 | Metal plate connection structure |
| CN108907599A (en) * | 2018-07-31 | 2018-11-30 | 河南工学院 | Automatic welding device is used in a kind of machining |
| CN108971851A (en) * | 2018-08-13 | 2018-12-11 | 繁昌县通民机械制造有限公司 | A kind of article welding fixture |
| CN108972088A (en) * | 2018-09-27 | 2018-12-11 | 马鞍山常裕机械设备有限公司 | A kind of thin-walled motor shell milling fixture convenient for mounting and clamping |
| CN109500537A (en) * | 2018-12-28 | 2019-03-22 | 徐工消防安全装备有限公司 | Tension tool and tensioner system |
| CN110480445A (en) * | 2019-08-21 | 2019-11-22 | 马鞍山常裕机械设备有限公司 | A kind of deburring equipment for the steering motor shell for preventing from scratching |
| CN110524184B (en) * | 2019-09-20 | 2022-02-22 | 中铁大桥局第七工程有限公司 | Welding fixing device |
| CN110524184A (en) * | 2019-09-20 | 2019-12-03 | 中铁大桥局第七工程有限公司 | A kind of weld fixture apparatus |
| CN110757373A (en) * | 2019-11-22 | 2020-02-07 | 林琳 | Galvanized steel pipe special fixture with inside and outside clamped simultaneously |
| CN110978771A (en) * | 2019-12-21 | 2020-04-10 | 杭州旭美包装制品有限公司 | Stamping machine |
| CN111547618A (en) * | 2020-04-29 | 2020-08-18 | 江苏盐电阀门有限公司 | Hoisting and conveying device for replacing valve element of large ball valve |
| CN111408893A (en) * | 2020-04-30 | 2020-07-14 | 中国航发哈尔滨东安发动机有限公司 | Self-centering expansion welding fixture |
| CN112548801A (en) * | 2020-12-08 | 2021-03-26 | 孟辉 | Alloy valve casting forming process |
| CN112894029A (en) * | 2020-12-10 | 2021-06-04 | 机械科学研究总院青岛分院有限公司 | RV reduction gear machining is with location frock |
| CN113319622A (en) * | 2021-08-03 | 2021-08-31 | 江苏鑫沪莱泵业有限公司 | Positioning fixture for milling end cover of submersible pump |
| CN113681186A (en) * | 2021-08-17 | 2021-11-23 | 上海龙炽机械设备有限公司 | Welding method for rotor of horizontal spiral centrifuge |
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| Publication number | Publication date |
|---|---|
| CN107052555B (en) | 2019-03-08 |
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