CN106346176B - A kind of railway freight-car part assembles multipurpose positioning clamping device - Google Patents
A kind of railway freight-car part assembles multipurpose positioning clamping device Download PDFInfo
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- CN106346176B CN106346176B CN201610808959.7A CN201610808959A CN106346176B CN 106346176 B CN106346176 B CN 106346176B CN 201610808959 A CN201610808959 A CN 201610808959A CN 106346176 B CN106346176 B CN 106346176B
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- clamping device
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- 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
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
- Connection Of Plates (AREA)
Abstract
The present invention relates to a kind of railway freight-car part to assemble multipurpose positioning clamping device, and it includes a pedestal, a support block, a location-plate, dynamic plate, a round pin, the first screw rod and second screw rod;Rear end is provided with the support block on the pedestal, and front end is provided with the location-plate, and the dynamic plate is flexibly connected by the round pin with the pedestal;First screw rod and the second screw rod are provided with the dynamic plate.The present invention is different with the position of location-plate due to assembling dynamic plate, and has a variety of positioning and clamping functions.Other accessories need not be manufactured and just can make up various body part group mounted welders, be simple to manufacture, accessory is general, easy to maintenance.It present invention can be widely used in the body part group mounted welder of railway freight-car, be particularly adapted to single-piece, small lot car bodywork group welding part flexible frock uses.
Description
Technical field
The present invention relates to a kind of railway truck's accessories, especially with regard to one kind in railway freight-car side wall, headwall assembling
The railway freight-car part assembling multipurpose positioning clamping device used.
Background technology
In the car body manufacture of railway freight-car, its part such as side wall, headwall are plate, the part of beam group weldering, by by blanking
Plurality of steel plates and various shaped steel beam weldering is organized in assembling tyre and is formed.The lorry part produced in batches now need to be typically equipped with specially
The group weldering tire of door carries out being welded into one after completing the positioning of each accessory, clamping.But carrying out manufacturing experimently new lorry part
Or when carrying out small lot production, it is just very uneconomical to manufacture special group weldering tire, and manufacture specialized groups weldering tire need to carry out it is special
Industry design, manufacture, workload is larger, the time is longer, and often the production of influence small lot and the trial-production of new product car body, remodeling produce
Progress.It is an important factor for restricting railway freight-car trial production of new products and small lot production.At present, it is no preferably conveniently to adjust
, the railway freight-car part assembly tool of flexible combination.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide a kind of assembling multipurpose positioning of railway freight-car part to clamp dress
Put, the device need not newly increase other parts, in that context it may be convenient to positioning that various car body assembling parts are assembled and
Clamp, can ensure to positioning parts are accurate, reliable clamping is firm by a group weldering, while make single-piece group mounted welder ease of assembly, adjust
Lift face is easy.It can adapt to the assembling requirement of the group weldering part of different kinds of railways truck body.
To achieve the above object, the present invention takes following technical scheme:A kind of railway freight-car part assembling multipurpose positioning
Clamping device, it is characterised in that:The positioning clamping device include a pedestal, a support block, a location-plate, a dynamic plate, a round pin,
First screw rod and the second screw rod;Rear end is provided with the support block on the pedestal, and front end is provided with the location-plate, and described
Dynamic plate is flexibly connected by the round pin with the pedestal;First screw rod and the second spiral shell are provided with the dynamic plate
Bar.
The pedestal includes a bottom plate, two risers and a fixed board;The bottom plate both sides are symmetrically arranged with some oval
Through hole, the bottom plate and steel platform bolt are fixed by the long round tube hole;Two are symmetrically arranged with the middle part of the bottom plate
The riser, the chute of L-shaped insertion is both provided with each riser, and the round pin is located in the chute;It is described
Bottom plate front end is provided with the fixed board, and described four vertex of fixed board are respectively arranged with a mounting hole, the fixation
One first major thread through hole is provided with the middle part of riser, second screw rod matches setting with the first major thread through hole, described
Second screw rod can be screwed in the first major thread through hole;The base plate rear end is provided with some tapped through holes, the support block
The bottom rear is fixed on by the tapped through hole.
There is a circular arc nest positioned at the end set of the L-shaped horizontal segment of the chute.
The circular arc nest depth is 3~5mm.
The pedestal uses steel plate assembly welding shaping.
The dynamic plate include plate body and with the integrally formed L-square of the plate body;The plate body front end is the right angle
Plate, rear end is provided with fillet structure, and the plate body rear side is provided with some through holes, and the round pin passes through the through hole
The plate body is connected on the pedestal;Plane middle part is provided with second on the plate body close to the L-square
Major thread through hole, first screw rod screw in the plate body by the second largest tapped through hole;In the L-square end face
Between position be provided with the third-largest tapped through hole, second screw rod passes through the third-largest tapped through hole and screws in the L-square.
Some tapped blind holes for being used to assemble the location-plate are additionally provided with positioned at the L-square both sides.
The lower end of first screw rod and the second screw rod be both provided with the integrally formed hemispherical head of screw rod, upper end is all set
There is the big cylinder being integrally formed with screw rod and with through hole.
The support block top setting is fluted, and the well width of the groove matches with the dynamic plate width, described
The bottom of groove sets two through holes with step.
The location-plate includes a rectangle steel plate body, and rectangle steel plate body one end end set has and one
It is body formed and with the orthogonal block card of rectangle steel plate body;The middle part of the rectangle steel plate body sets four spiral shells
Line through hole.
For the present invention due to taking above technical scheme, it has advantages below:1st, the present invention due to using pedestal and dynamic plate,
Position between support block, locating piece is arranged to the unit module structure of composable adjustment, can according to the size of part, structure and
Assembling is needed, and only unit inner body assembling position is adjusted, it becomes possible to adapts to part assembling needs.Therefore, it is of the invention
It is suitable for positioning and clamping requirement of the various sizes of vehicle part when steel platform carries out group weldering.When workpiece converts, without system
A variety of accessories are made, are simple to manufacture, accessory is general, easy to maintenance.2nd, the present invention is penetrated due to moving plate and pedestal using round pin and L-shaped
Chute slidably fixed form, dynamic plate can be fixed quickly with pedestal during clamping, during release dynamic plate by simply sliding, overturning,
Can quickly with isolation of components and concede section upper lifting space.To member grip, loosen it is quick, conveniently.Its is simple in construction,
It is easily manufactured.3rd, the present invention in dynamic front edge of board due to being provided with L-square and the orthogonal tapped through hole at middle part, in its spiral shell
Two screw rods are screwed in line through hole.When the round pin of dynamic plate be located at the chute lower end that L-shaped penetrates and afterbody is placed in support block groove
When, screwing two screw rods can recline part with location-plate backward, be reclined with platform downwards, and workpiece is positioned, therefore the present apparatus
Workpiece clamping can be positioned in both direction, frock service efficiency is higher, simple to operate.4th, it is of the invention in dynamic front edge of board and straight
The two sides of gusset are provided with tapped blind hole, and its pitch-row and aperture are suitable with location-plate, can assemble location-plate with bolt
In dynamic front edge of board, the position of the column of part beam vertical can be positioned.The present apparatus can be made to have to middle stud location
Function.5th, the present invention sets some through holes for wearing round pin in two middle side parts of dynamic plate, and its pitch-row at the rear portion of pedestal with setting
The pitch-row of the screwed hole of fixed support block is equal, and the hole site for wearing round pin can be set according to the distance of dynamic front edge of board and workpiece,
Support block is fixed on the corresponding screwed hole of pedestal simultaneously, makes plate unsupported piece of interference when rotating.Its is simple in construction
Intuitively, it is easily operated.6th, support block top of the invention is provided with groove, and its width dimensions is equal with dynamic plate width, in dynamic plate
When being put into groove, support block can position to dynamic plate afterbody, to keep dynamic Board position reliably to fix.So as to ensure positioning rule
It is very little accurate.7th, the chute for the L-shaped insertion that riser of the invention is set, sets a circular arc nest on its horizontal component.In dynamic plate
When clamping workpiece, round pin cylinder enters clamping after the circle nest, to avoid round pin from departing from due to vibrations.8th, of the invention pedestal
Vertical fixed plate screws in screw rod, and the forward thrust available for the free end to being positioned workpiece is held out against, and without increasing accessory, realizes more
Function.9th, the vertical block card that location-plate end side of the invention is set, can be to the crossbeam end of workpiece when block card assembles forward
Portion is positioned.When vertical block card assembles backward, only crossbeam medium position is positioned, with simple structure, realization device
It is multi-functional.Lorry body group weldering part is present invention can be widely used to flexibly to use in common group welds platform frock.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the present invention;
Fig. 2 is Fig. 1 schematic top plan view;
Fig. 3 is Fig. 1 dextrad view;
Fig. 4 is Fig. 1 D-D cross-sectional views;
Fig. 5 is Fig. 1 Section A-A sectional view;
Fig. 6 is Fig. 1 left-hand view;
Fig. 7 is the axial side view of the present invention;
Fig. 8 is the present invention in the shaft side figure positioned to workpiece centre position;
Fig. 9 is the present invention in the shaft side figure positioned to workpiece end position;
Figure 10 is shaft side figure of the present invention in the stud positioning to crossbeam;
Figure 11 is the shaft side figure positioned when the present invention does not assemble location-plate to the stud of crossbeam.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
As shown in Fig. 1~Fig. 7, the present invention provides a kind of railway freight-car part assembling multipurpose positioning clamping device, and it is wrapped
Include a pedestal 1, a support block 2, a location-plate 3, one and move plate 4, a round pin 5, the first screw rod 6 and the second screw rod 7.After on pedestal 1
End is provided with support block 2, and front end is provided with location-plate 3, and dynamic plate 4 is flexibly connected by round pin 5 with pedestal 1.On dynamic plate 4
The first screw rod 6 and the second screw rod 7 are provided with, for clamping action.
In above-described embodiment, pedestal 1 includes a bottom plate 10, two risers 12 and a fixed board 15.The both sides of bottom plate 10 are symmetrical
Some long round tube holes 11 are provided with, are fixed bottom plate 10 and steel platform bolt by long round tube hole 11;It is right positioned at the middle part of bottom plate 10
Title is provided with two risers 12, and the chute 13 of L-shaped insertion is both provided with each riser 12, and round pin 5 is located in chute 13, will
Dynamic plate 4 is connected between two risers 12.There are a circular arc nest 14, circular arc nest 14 positioned at the end set of the L-shaped horizontal segment of chute 13
Depth is 3~5mm, is departed from when avoiding round pin 5 from clamping at circular arc nest 14 due to vibrations.The front end of bottom plate 10 is provided with fixed vertical
Plate 15,15 4 vertex of fixed board are respectively arranged with a mounting hole 16, and the middle part of fixed board 15 is provided with one first big spiral shell
Line through hole 17;The rear end of bottom plate 10 is provided with some tapped through holes 18, after support block 2 is fixed on bottom plate 10 by tapped through hole 18
Portion, and the position of support block 2 can be adjusted by some tapped through holes 18.
Wherein, pedestal 1 can use steel plate assembly welding shaping, be made after being machined after shaping.
In the various embodiments described above, dynamic plate 4 includes plate body 40 and L-square integrally formed with plate body 40 41, the first screw rod
6 and second screw rod 7.The front end of plate body 40 is L-square 41, and rear end is provided with fillet structure, and is provided with the rear side of plate body 40
Some through holes 42, between plate body 40 is connected to two risers 12 by round pin 5 by through hole 42, to realize the assembling of dynamic plate 4 and pedestal 1
Positioning;Reduce its radius of turn when plate 4 is rotated entirely around round pin 5 by the fillet structure of plate body 40, avoid and support
Block 2 is interfered.Plane middle part is provided with second largest tapped through hole 43, the first screw rod 6 on the plate body 40 close to L-square 41
Plate body 40 is screwed in by second largest tapped through hole 43, clamped to treat assembling parts;Set in the end face middle part of L-square 41
The third-largest tapped through hole 44 is equipped with, the second screw rod 7 screws in L-square 41 by the third-largest tapped through hole 44, to treat assembled portion
Part clamps;Second screw rod 7 also matches setting with the first major thread through hole 17 of base 1, and the second screw rod 7 can screw in the first major thread
In through hole 17.Some tapped blind holes 45 are additionally provided with positioned at the both sides of L-square 41, are positioned in order to which location-plate 3 assembles.
Wherein, move after the entirety of plate 4 is machined after forging, is heat-treated using tool steel and be made, make it have
Higher strength and stiffness.
In above-described embodiment, the first screw rod 6 and the second screw rod 7 are all made up of steel through over mechanical processing, its diameter, spiral shell
Line, pitch and the first major thread through hole 17 of pedestal 1, the second largest tapped through hole 43 of dynamic plate 4, the phase of the third-largest tapped through hole 44
Deng.The lower end of first screw rod 6 and the second screw rod 7 be both provided with the integrally formed hemispherical head of screw rod, upper end is both provided with and spiral shell
Bar is integrally formed and the big cylinder with through hole.Through hole on big cylinder is easy to instrument to the first screw rod 6 and turn of the second screw rod 7
It is dynamic.
In the various embodiments described above, support block 2 uses rectangular parallelepiped structure, is made up of steel through over mechanical processing.In support block 2
Portion sets fluted 21, and the width of the well width of groove 21 and plate body 40 in dynamic plate 4 matches, and groove 21 is put into plate body 40
When, support block 2 can position to the afterbody of plate body 40, to keep plate body 40 reliably to be fixed position in positioning, so as to
Ensure that location dimension is accurate.Two through holes 22 with step are set in the bottom of groove 21, the hole with the through hole 22 of step
Pitch-row away from the tapped through hole 18 with the rear portion of 1 bottom plate of pedestal 10 is equal, for being fixed through bolt and the bottom plate 10 of pedestal 1.According to
The dynamic through hole 42 of plate 4 wears round pin position, it is determined that wear bolt position of the positioning support block 2 in pedestal 1, simple and direct-viewing operation, easily with
Adjustment.
In the various embodiments described above, location-plate 3 is machined by tool steel after forging, be heat-treated after be made, because
This has the characteristics of wear-resistant, the high surface of hardness is hardly damaged deformation.Location-plate 3 includes a rectangle steel plate body 30, rectangular
One end end set of shape steel plate body 30 has to be integrally formed and block card orthogonal with rectangle steel plate body 30 31 with it.It is long
The length and width of square plate body 30 are in match setting with the length and width of the fixed board 15 of the front end of pedestal 1, in rectangle steel plate body
30 four tapped through holes 32 of middle part setting, its pitch-row are equal with the pitch-row of fixed board 15;And the pitch-row of tapped through hole 32 with
The pitch-row of tapped blind hole 45 on the dynamic L-square 41 of plate 4 is equal, so that location-plate 3 and dynamic plate 4 are assembled.
In the various embodiments described above, round pin 5 is ordinary steel round pin, is made up of steel through over mechanical processing, its diameter and dynamic plate 4
The bore dia of through hole 42 that two sides are set is equal.After the assembled washer of round pin 5, split pin, it can integrally be passed through in the L-shaped of pedestal 1
It is movable in logical chute 13.
Embodiment:As shown in Fig. 8~Figure 11, each part of positioning clamping device of the invention can be according to different body parts
Group weldering positioning clamp needs assembled, set.A usual body part needs multiple parts, and is arranged to different sides
Formula, the positioning clamping tool of composition body part can be spelled in general steel platform.It is as follows that it assembles positioning method:
1st, as shown in figure 8, the block card 31 of location-plate 3 assembles backward, before being fixed by bolts to the fixed board 15 of pedestal 1
Face, the longer positioning for being positioned the middle side of beam 100 for body part.The L-square 41 of dynamic plate 4 assembles downwards, with rotation
Tight first screw rod 6, the second screw rod 7 make to be positioned beam 100 and steel platform plane, the both direction of location-plate 3 clamp.
2nd, as shown in figure 9, the block card 31 of location-plate 3 assembles forward, be fixed by bolts to pedestal 1 consolidate plate 15 of halting before
Face, the positioning (location-plate 3 can left and right assembling) for being positioned the left and right ends position of beam 100 for body part.With to quilt
The positioning action of the axis direction of positioning beam 100.
3rd, as shown in Figure 10, location-plate 3 (transverse direction or stand to) is fixed with bolt is assembled in the dynamic side of 4 front end L-square of plate 41
On the tapped blind hole 45 of (the dynamic contrary class of plate 4 dress), the position available for the vertical pillars 200 for being positioned beam 100 to body part
One side positions.
4th, as shown in figure 11, location-plate 3 is not assembled, the first major thread through hole 17 of the fixed board 15 of pedestal 1 screws in the
Two screw rods 722, can be used for that ejection is tight forward to body part a part.
In the above-mentioned various assembling modes of implementation, after the completion of the weldering of assembled body part group, the first screw rod 6 of reverse rotation,
Second screw rod 7 unclamps the body part clamped, plate 4 and round pin 5 is slided backward along chute 13, then slid up along chute 13
It is dynamic, then the dynamic plate 4 of unitary rotation, make the head of plate 4 upward, the tail down of dynamic plate 4 is finally fallen into two risers 12 of pedestal 1
Central space, and it is close into stable state with the fixed board 15 of support block 2 or pedestal 1.So can be with quick opening pair
The clamping of part, concede the space that part hangs out frock.
In summary, in the use of the present invention, pedestal 1 uses bolt by being arranged on the long round tube holes 11 of the both sides of bottom plate 10
The overall fixation of pedestal 1 is assembled in the T-slot of general steel platform.According to the actual conditions of lorry body part, this is set
The assembling mode of the particular location of cell arrangement, quantity and the present apparatus, the group weldering tire of any body part is quickly assembled into, it is real
The now positioning to body part, clamp, hold out against effect.Reuse can be quickly removed after use, is re-assemblied.It need not be increased
Its accessory, the group weldering positioning for adapting to any body part clamp needs.
The various embodiments described above are merely to illustrate the present invention, and structure and size, set location and the shape of each part are all can be with
It is varied from, on the basis of technical solution of the present invention, all improvement carried out according to the principle of the invention to individual part and waits
With conversion, should not exclude outside protection scope of the present invention.
Claims (9)
1. a kind of railway freight-car part assembles multipurpose positioning clamping device, it is characterised in that:The positioning clamping device includes one
Pedestal, a support block, a location-plate, dynamic plate, a round pin, the first screw rod and second screw rod;Rear end is provided with the pedestal
The support block, front end is provided with the location-plate, and the dynamic plate is flexibly connected by the round pin with the pedestal;It is located at
First screw rod and the second screw rod are provided with the dynamic plate;
The pedestal includes a bottom plate, two risers and a fixed board;The bottom plate both sides are symmetrically arranged with some long round tube holes,
The bottom plate and steel platform bolt are fixed by the long round tube hole;It is described vertical that two are symmetrically arranged with the middle part of the bottom plate
Plate, the chute of L-shaped insertion is both provided with each riser, and the round pin is located in the chute;Before the bottom plate
End is provided with the fixed board, and described four vertex of fixed board are respectively arranged with a mounting hole, in the fixed board
Portion is provided with one first major thread through hole, and second screw rod matches setting, second spiral shell with the first major thread through hole
Bar can be screwed in the first major thread through hole;The base plate rear end is provided with some tapped through holes, and the support block passes through institute
State tapped through hole and be fixed on the bottom rear.
A kind of 2. railway freight-car part assembling multipurpose positioning clamping device as claimed in claim 1, it is characterised in that:It is located at
The end set of the L-shaped horizontal segment of the chute has a circular arc nest.
A kind of 3. railway freight-car part assembling multipurpose positioning clamping device as claimed in claim 2, it is characterised in that:It is described
Circular arc nest depth is 3~5mm.
A kind of 4. railway freight-car part assembling multipurpose positioning clamping device as claimed in claim 1, it is characterised in that:It is described
Pedestal uses steel plate assembly welding shaping.
A kind of 5. railway freight-car part assembling multipurpose positioning clamping device as claimed in claim 1, it is characterised in that:It is described
Dynamic plate include plate body and with the integrally formed L-square of the plate body;The plate body front end is the L-square, and rear end is set
There is a fillet structure, and the plate body rear side is provided with some through holes, the round pin is by the through hole by the plate body
It is connected on the pedestal;Plane middle part is provided with the second major thread and led on the plate body close to the L-square
Hole, first screw rod screw in the plate body by the second largest tapped through hole;Set in L-square end face middle part
The third-largest tapped through hole is equipped with, second screw rod screws in the L-square by the third-largest tapped through hole.
A kind of 6. railway freight-car part assembling multipurpose positioning clamping device as claimed in claim 5, it is characterised in that:It is located at
The L-square both sides are additionally provided with some tapped blind holes for being used to assemble the location-plate.
A kind of 7. railway freight-car part assembling multipurpose positioning clamping device as described in claim 1 or 5, it is characterised in that:
The lower end of first screw rod and the second screw rod be both provided with the integrally formed hemispherical head of screw rod, upper end is both provided with and screw rod
It is integrally formed and the big cylinder with through hole.
A kind of 8. railway freight-car part assembling multipurpose positioning clamping device as claimed in claim 1, it is characterised in that:It is described
The setting of support block top is fluted, and the well width of the groove matches with the dynamic plate width, is set in the bottom of the groove
Put two through holes with step.
A kind of 9. railway freight-car part assembling multipurpose positioning clamping device as claimed in claim 1, it is characterised in that:It is described
Location-plate includes a rectangle steel plate body, rectangle steel plate body one end end set have be integrally formed with it and with institute
State the orthogonal block card of rectangle steel plate body;The middle part of the rectangle steel plate body sets four tapped through holes.
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CN201610808959.7A CN106346176B (en) | 2016-09-07 | 2016-09-07 | A kind of railway freight-car part assembles multipurpose positioning clamping device |
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CN201610808959.7A CN106346176B (en) | 2016-09-07 | 2016-09-07 | A kind of railway freight-car part assembles multipurpose positioning clamping device |
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CN109398746A (en) * | 2017-08-15 | 2019-03-01 | 中航贵州飞机有限责任公司 | A kind of undercarriage assembly Special clamping device |
CN111168293A (en) * | 2018-11-09 | 2020-05-19 | 上海申龙客车有限公司 | Can dismantle positioner of rotatable oblique torsion bar seat |
KR102686638B1 (en) * | 2022-02-16 | 2024-07-22 | 로만시스(주) | Frame support device for assembling train body |
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JP2000126895A (en) * | 1998-10-22 | 2000-05-09 | Kobe Steel Ltd | Welding tool, and joining method using it |
DE202011000981U1 (en) * | 2011-04-26 | 2011-10-10 | Jen Yung Yang | Clamping device for spot welding |
CN203045249U (en) * | 2013-01-16 | 2013-07-10 | 无锡肯克重工设备有限公司 | Plate manual clamping device |
CN203357300U (en) * | 2013-06-04 | 2013-12-25 | 北汽福田汽车股份有限公司 | Clamping fixing device |
CN204183157U (en) * | 2014-10-30 | 2015-03-04 | 郑州市长城机器制造有限公司 | A kind of pipe profile hold down gag |
CN205043419U (en) * | 2015-10-20 | 2016-02-24 | 安徽江淮汽车股份有限公司 | Clamping mechanism through gasket height -adjusting |
CN205184111U (en) * | 2015-11-10 | 2016-04-27 | 广州电力机车有限公司 | Electric locomotive bogie frame welding fixture is with pushing away tight mechanism |
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Effective date of registration: 20190605 Address after: 161002 Qigihar City, Heilongjiang province Tiefeng District Plant Road No. 36 Patentee after: CRRC QIQIHAR VEHICLE CO., LTD. Address before: 100072 No. 1 Zhangguozhuangjia, Fengtai District, Beijing Patentee before: Beijing Zhongche 27 Vehicles Co. Ltd. |