CN102039537B - Heavy rail sizing device and method - Google Patents
Heavy rail sizing device and method Download PDFInfo
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- CN102039537B CN102039537B CN 200910187812 CN200910187812A CN102039537B CN 102039537 B CN102039537 B CN 102039537B CN 200910187812 CN200910187812 CN 200910187812 CN 200910187812 A CN200910187812 A CN 200910187812A CN 102039537 B CN102039537 B CN 102039537B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004513 sizing Methods 0.000 title abstract description 12
- 229920002635 polyurethane Polymers 0.000 claims abstract description 12
- 239000004814 polyurethane Substances 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000010720 hydraulic oil Substances 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims description 5
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 210000000245 forearm Anatomy 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000013016 damping Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Machines For Laying And Maintaining Railways (AREA)
Abstract
The invention provides a heavy rail sizing device and a method thereof, which is a single-group or double-group mechanical sizing device consisting of a ram lifting system, a transmission system, a rack and a detection switch. The electro-hydraulic push rod is used as a power source to drive the swing rod to swing, the lifting of the lifting plate is controlled by the top wheel arranged at the front end of the swing rod, the collision head at the upper end of the lifting plate rises and falls at two positions of working or stopping, and the collision head is matched with the sizing saw to realize accurate sizing of the heavy rail. Due to the adoption of the front detection switch and the damping and thickness-adjusting collision head with the polyurethane cushion pad and the adjusting gasket group, the collision to the collision head is reduced while the speed of the variable frequency roller bed is controlled, the service life of the sizing device is prolonged, the sizing precision of the heavy rail is improved, and the length tolerance of the heavy rail is controlled within +/-4 mm. The method has the advantages of simple structure, easy operation, reasonable method design, stable system operation, high operation rate, low accident rate and convenient maintenance, and can correspondingly improve the yield of the heavy rail. The invention is especially suitable for the four-group heavy rail sizing of 95, 96, 99 and 100 meters.
Description
Technical field
The invention belongs to the rolling equipment field, relate in particular to a kind of accurate mechanical length measuring device and method for scaling for the railway high speed heavy rail.
Background technology
Along with the speed-raising of rolling stock and the progress of steel rolling field high-speed rail production technology, the high-speed rail that speed per hour reaches 350km/h is also developed rapidly, thereby the quality requirement of the high-speed rail especially accuracy of length scaling is had higher requirement.
The high-speed rail scale is the accurately machined important step of rail.At present, almost all adopt bar none in the world the length measuring device of photo-electric control.German WAGNER, the U.S. CMI that China introduces and Austrian LINSINGER rail saw, bore the building-block machine scale and be that clamping roller-way counting, Photoelectric Detection and control realizes, namely realize the scale processing of heavy rail by fifth wheel, frequency conversion roller-way, clamping device, scale grating, Photoelectric Detection and automatically controlled programme-control.Yet, find in the use procedure, although above-mentioned automatically controlled length measuring device automaticity is higher, exist that investment is large, fault rate is high, the defective of maintenance difficult; And because fifth wheel and the wearing and tearing of frequency conversion roller-way, the gap of clamping device and the deviation of scale grating measuring data, its sizing accuracy obviously reduces after long-term the use, that have even do not reach the requirement of scale tolerance standard and have to stop using, not only waste fund and resource, and affected carrying out smoothly of Heavy-rail Production.
Summary of the invention
Purpose of the present invention aims to provide a kind of simple in structure, and is cheap, and sizing accuracy is high, and long service life, and convenient operation and maintenance can automatically switch and control heavy rail machinery length measuring device and method for scaling.
For this reason, the concrete technical solution taked of the present invention is:
A kind of heavy rail scaling apparatus is comprised of the jacking system of raming, transmission system, frame and sense switch; The jacking system of raming comprises lifter plate and rams; Transmission system comprises Electrohydraulic push rod, swing rod and the fork of taking turns with the top; Frame comprises column, base plate and connects the floor of column and base plate; The Electrohydraulic push rod that connects fork is fixed on above the framework soleplate by support, fork " ancon " with " arm is curved " is sleeved in the rotating shaft of being located at the swing rod on the framework soleplate, the lifter plate lower end that is installed on framework pillar one side falls to leaning against on the wheel of fork front end top, rams by the bolt flexible connection of a side in the lifter plate upper end; Electrohydraulic push rod is connected with external power source, hydraulic system and the sense switch that is arranged on frame the place ahead respectively.
Ram and comprise collision head plate, polyurethane cushion pad, adjusting shims and connecting bolt; The adjusting shims that connecting bolt passes collision head plate suit polyurethane cushion pad and is comprised of two different-thickness pads at least.
Described sense switch is installed in heavy-rail transportation roller-way one side apart from 8～18m place, frame the place ahead.
Be connected with anti-skidding gusset below the described framework soleplate.
The maximum ga(u)ge of described adjusting shims is 20mm, is comprised of 5 pads.
It is that length measuring device is combined by two covers that of the present invention another becomes example, by a unit frame forward and backward two cover length measuring devices is connected as one; Being about to framework soleplate lengthens, set up a column, the jacking system of raming, transmission system are installed and connect external power source, hydraulic system and sense switch at base plate and column respectively, and set up two crossbeams in the column upper end, by crossbeam two root posts are linked into an integrated entity; Simultaneously, a carrying roller is set between two crossbeams, the carrying roller two ends use bolt the inboard of knot at two crossbeams.
Distance between described front and back two two of length measuring devices of cover are ramed is 1m.
A kind of method of using above-mentioned heavy rail scaling apparatus, its specific works program and method are:
According to setting program, the length measuring device rising magnetic valve that the heavy rail length saw is selected is charged, and hydraulic oil is through the intersection position of solenoid directional control valve, and Electrohydraulic push rod backhaul pulling fork swings around the shaft, the anterior top of fork wheel promotes lifter plate and rises, and delivers to the scale position that upper surface is higher than roller-way 30mm with raming; Time-delay 2s outage after lifter plate rises, lifter plate remains on lifting position by hydraulic lock;
Be located at the sense switch detection in length measuring device the place ahead when the heavy rail of operation after, instruction frequency conversion roller-way reduces speed now, successively move 8s with the speed of 1m/s, with 0.5m/s operation 3s, with 0.2m/s operation 3s, still turn again 0.5s to the heavy rail rear frequency conversion roller-way of raming, make heavy rail eliminate bounce-back, the heavy rail end face with ram close contact;
After length saw, the processing of brill building-block machine, selected length measuring device decline magnetic valve is charged, hydraulic pressure is by the parallel position through solenoid directional control valve, Electrohydraulic push rod stretches out and promotes fork forearm retraction, fork front end top wheel and the lifter plate that is pressed against on the wheel of top descend simultaneously, time-delay 2s outage after descending, the upper surface of raming is lower than roller-way 30mm, namely finishes the scale process one time;
Length measuring device for two cover combinations if change cut lengths, uses another set of length measuring device, only needs the selected another set of length measuring device of length saw, then comes again said process.
The stroke of described Electrohydraulic push rod is 30mm; The pivot angle of fork is 11.4 °; The lifting distance of raming is 60mm.
Beneficial effect of the present invention is:
Since be provided with the polyurethane cushion pad in the raming of this length measuring device, behind the heavy rail bump, the compressed 5～15mm of polyurethane cushion pad, thereby absorbed the kinetic energy that impacts, reach the purpose of deceleration, damping, avoided the damage of raming, prolonged service life of length measuring device.
The adjustment pad of different-thickness is housed in owing to raming, can increases and decreases according to the variation of season and weather temperature the thickness of adjusting shims, accurately control the heavy rail length tolerance for minimum, thereby improve the sizing accuracy of heavy rail.According to statistics, Heavy-rail Production physical length tolerance all be controlled at ± 4mm in.
Adopt the mode of two cover length measuring devices combinations, both can improve the stability of length measuring device integral body, can make again length only poor 1m scale and be used for the general frame of non-scale rail of railroad curve inboard, reduce and take up an area; Framework soleplate arranges anti-skidding gusset, can avoid the frame foundation bolt to be subject to shearing force, reduces the vibrations of integral body when being impacted, and the base plate that lengthens can reduce the tilting moment that produces when heavy rail clashes into.Upper rack crossbeam centre position arranges a carrying roller, can prevent because fixed ruler baffle is long, the rollgang spacing is wider heavy rail head downwarp and cause impact to the rear portion conveying roller.
Owing to before length measuring device, being provided with sense switch, can effectively control the frequency conversion roller table speed, alleviate heavy rail to the impact of raming and the bounce-back of clashing into rear heavy rail self, when guaranteeing high-speed rail end face and baffle plate close contact, avoided the accidental damage of raming.
Be used as power with Electrohydraulic push rod, adopt the type of attachment of fork, flexible movements are reliable, and quick and precisely, and floor space is little, and energy consumption is low, it is large to exert oneself.
Length measuring device of the present invention is particularly suitable for 95,96,99,100 meters four groups of scale heavy rails and uses, it is simple in structure, easy operating, method is reasonable in design, system run all right, and operating rate is high, accident rate is low, be convenient to maintenance and safeguard, when significantly improving the heavy rail sizing accuracy, lumber recovery that can corresponding raising heavy rail.
Description of drawings
Fig. 1 is the heavy rail scaling apparatus front view.
Fig. 2 is the heavy rail scaling apparatus top view.
Fig. 3 is the heavy rail scaling apparatus cutaway view of raming.
Among the figure: anti-skidding gusset 1, base plate 2, floor 3, top wheel 4, column 5, ram 6, lifter plate 7, carrying roller 8, crossbeam 9, fork 10, rotating shaft 11, swing rod 12, Electrohydraulic push rod 13, support 14, collision head plate 15, connecting bolt 16, polyurethane cushion pad 17, adjusting shims 18.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
By accompanying drawing as seen, the present invention's heavy rail scaling apparatus mainly is comprised of the jacking system of raming, transmission system, frame and sense switch four parts.The jacking system of raming comprises lifter plate 7 and rams 6; Transmission system comprises that Electrohydraulic push rod 13, swing rod 12 reach the fork 10 with top wheel 4; Frame comprises column 5, base plate 2 and connects the floor 3 of column 5 and base plate 2.
Ram and 6 comprise collision head plate 15, connecting bolt 16, polyurethane cushion pad 17, adjusting shims 18.Connecting bolt 16 passes is with reeded collision head plate 15, and cushion pad 17 and adjusting shims 18 are cascaded.When quality is the heavy rail of 60kN when raming with 1.5m/s speed, polyurethane cushion pad 17 is compressed 5～10mm, thereby absorbed the kinetic energy that impacts, and reaches the purpose of deceleration, damping; Adjusting shims 18 selects respectively that thickness is 1,2,3,5, five kinds of 10mm adjust pads, and the thickness of the real data correction polyurethane cushion pad 17 of measuring according to heavy rail and adjusting shims 18 is in order to drop to minimum with length tolerance.
For independent use one cover length measuring device, frame is comprised of a root post 5, an anti-skidding gusset 1, a base plate 2 and two floors 3, and bracket height is that 800mm, width are 300mm, and base plate 2 length are 1000mm.Electrohydraulic push rod 13 is fixed on the support 14, support 14 usefulness bolts be connected to framework soleplate 2 above; Electrohydraulic push rod 13 front ends are flexibly connected a fork 10 with " arm is curved ", and " ancon " of fork 10 is sleeved in the rotating shaft 11, and 11 rotary oscillations around the shaft, and its pivot angle is 11.4 °; Rotating shaft 11 is fixed in above the swing rod 12,12 of swing rods with bolt knot on framework soleplate 2.The front end of fork 10 is provided with top wheel 4, and top wheel 4 stretches in notch is reserved in framework pillar 5 bottoms after installing; Lifter plate 7 lower ends that are installed in the framework pillar 5 fall to leaning against on the top wheel 4, and lifter plate 7 upper ends are flexibly connected by a monodirectional locking bolt and ram 6.Electrohydraulic push rod 13 also connects respectively external power source, hydraulic system and is arranged on the sense switch of heavy-rail transportation roller-way one side at 15m place, frame the place ahead.
It is that length measuring device is combined by two covers that of the present invention another becomes example, namely by a unit frame front and back two cover length measuring devices is connected as one.Specific practice is: framework soleplate 2 is added grow to 2000mm, the distance between two two of length measuring devices of cover are ramed before and after making reaches 1m; Set up a column 5, are connected with column at base plate 2 respectively and the jacking system of raming, transmission system are installed and connect external power source, hydraulic system and sense switch.At two crossbeams 9 of column 5 upper ends welding, two root posts 5 are linked into an integrated entity simultaneously; And a carrying roller 8 is set between two crossbeams 9, uses bolt the inboard of knot at two crossbeams 9 at carrying roller 8 two ends.By the transitional function of carrying roller 8, make the unlikely impact that causes the rear portion conveying roller of heavy rail of head downwarp.
Specific works program and the method for heavy rail scaling apparatus of the present invention are:
According to predefined program, the heavy rail length saw rises selected length measuring device, makes the rising magnetic valve charged, and hydraulic oil is through the intersection position of solenoid directional control valve, Electrohydraulic push rod 13 backhauls; Because " ancon " of fork 10 is sleeved in the fixing rotating shaft 11, therefore Electrohydraulic push rod 13 must spur around the shaft 11 swings of fork 10, fork 10 anterior top wheels 4 rise, and promotion lifter plate 7 rises, be pushed into the upper limit position thereby will ram on 6,6 the upper surface of namely raming is higher than the scale position of roller-way 30mm.After lifter plate 7 rises and puts in place, time-delay 2s outage, lifter plate 7 remains on the motionless position of rising by the hydraulic lock of Electrohydraulic push rod 13.
Be located at the sense switch detection at 15m place, length measuring device the place ahead when the heavy rail of operation after, sense switch sends deceleration instruction, the frequency conversion roller-way reduces speed now, with the speed operation 8s of 1m/s, with 0.5m/s operation 3s, move 3s with 0.2m/s afterwards more first, until heavy rail is ramed after 6, the frequency conversion roller-way still turns 0.5s again, thereby moves after eliminating the bounce-back of heavy rail, guarantees the heavy rail end face and rams 6 tight the contact.
After length saw, the sawing of brill building-block machine, boring finish, selected length measuring device descends, the decline magnetic valve is charged, hydraulic oil is through the parallel position of solenoid directional control valve, Electrohydraulic push rod 13 stretches out, and promotes fork 10 retractions, the top wheel 4 of fork 10 front ends and be pressed against lifter plate 7 on the top wheel 4 and drop to simultaneously 6 the upper surface of raming and be lower than roller-way 30mm, then the scale process is namely finished in the 2s that delays time outage one time.
Length measuring device for two cover combinations if change cut lengths, uses another set of length measuring device, only needs the selected another set of length measuring device of length saw, then comes again said process and gets final product.
Claims (10)
1. a heavy rail scaling apparatus is characterized in that, mainly is comprised of the jacking system of raming, transmission system, frame and sense switch; The jacking system of raming comprises lifter plate and rams; Transmission system comprises Electrohydraulic push rod, swing rod and the fork of taking turns with the top; Frame comprises column, base plate and connects the floor of column and base plate; The Electrohydraulic push rod that connects fork is fixed on above the framework soleplate by support, fork " ancon " with " arm is curved " is sleeved in the rotating shaft of being located at the swing rod on the framework soleplate, the lifter plate lower end that is installed on framework pillar one side falls to leaning against on the wheel of fork front end top, rams by the bolt flexible connection of a side in the lifter plate upper end; Electrohydraulic push rod is connected with external power source, hydraulic system and the sense switch that is arranged on frame the place ahead respectively; Described raming comprises collision head plate, polyurethane cushion pad, adjusting shims and connecting bolt; Connecting bolt passes is with reeded collision head plate, polyurethane cushion pad and adjusting shims are serially connected, and described connecting bolt is connected to the lifter plate upper end successively with collision head plate, polyurethane cushion pad and adjusting shims, wherein, described adjusting shims is comprised of the pad of two different-thickness at least.
2. heavy rail scaling apparatus according to claim 1 is characterized in that, described sense switch is installed in heavy-rail transportation roller-way one side apart from 8～18m place, frame the place ahead.
3. heavy rail scaling apparatus according to claim 1 is characterized in that, is connected with anti-skidding gusset below the described framework soleplate.
4. heavy rail scaling apparatus according to claim 1 is characterized in that, the maximum ga(u)ge of described adjusting shims is 20mm, is comprised of 5 pads.
5. heavy rail scaling apparatus according to claim 1 is characterized in that, described length measuring device is combined by two covers, by a unit frame front and back two cover length measuring devices is connected as one; Wherein, framework soleplate is lengthened, two cover length measuring devices one in front and one in back divide and are listed on the framework soleplate, and two crossbeams are set up in the column upper end of two cover length measuring devices in front and back, link into an integrated entity by the column of crossbeam with front and back two cover length measuring devices; Simultaneously, a carrying roller is set between two crossbeams, the carrying roller two ends are connected to the inboard of two crossbeams with bolt.
6. heavy rail scaling apparatus according to claim 1 is characterized in that, the pivot angle of described fork is 11.4 °.
7. heavy rail scaling apparatus according to claim 1 is characterized in that, the lifting distance of raming is 60mm.
8. heavy rail scaling apparatus according to claim 5 is characterized in that, the distance between described front and back two two of length measuring devices of cover are ramed is 1m.
9. a right to use requires the method for 1 described heavy rail scaling apparatus, it is characterized in that, the using method of described heavy rail scaling apparatus is specially:
According to setting program, the length measuring device rising magnetic valve that the heavy rail length saw is selected is charged, and hydraulic oil is through the intersection position of solenoid directional control valve, and Electrohydraulic push rod backhaul pulling fork swings around the shaft, the anterior top of fork wheel promotes lifter plate and rises, and delivers to the scale position that upper surface is higher than roller-way 30mm with raming; Time-delay 2s outage after lifter plate rises, lifter plate remains on lifting position by hydraulic lock;
Be located at the sense switch detection in length measuring device the place ahead when the heavy rail of operation after, instruction frequency conversion roller-way reduces speed now, successively move 8s with the speed of 1m/s, with 0.5m/s operation 3s, with 0.2m/s operation 3s, still turn again 0.5s to the heavy rail rear frequency conversion roller-way of raming, make heavy rail eliminate bounce-back, the heavy rail end face with ram close contact;
After length saw, the processing of brill building-block machine, selected length measuring device decline magnetic valve is charged, hydraulic oil is through the parallel position of solenoid directional control valve, Electrohydraulic push rod stretches out and promotes fork forearm retraction, fork front end top wheel and the lifter plate that is pressed against on the wheel of top descend simultaneously, time-delay 2s outage after descending, the upper surface of raming is lower than roller-way 30mm, namely finishes the scale process one time.
10. a right to use requires the method for 5 described heavy rail scaling apparatus, it is characterized in that, the using method of described heavy rail scaling apparatus is specially:
According to setting program, the length measuring device rising magnetic valve that the heavy rail length saw is selected is charged, and hydraulic oil is through the intersection position of solenoid directional control valve, and Electrohydraulic push rod backhaul pulling fork swings around the shaft, the anterior top of fork wheel promotes lifter plate and rises, and delivers to the scale position that upper surface is higher than roller-way 30mm with raming; Time-delay 2s outage after lifter plate rises, lifter plate remains on lifting position by hydraulic lock;
Be located at the sense switch detection in length measuring device the place ahead when the heavy rail of operation after, instruction frequency conversion roller-way reduces speed now, successively move 8s with the speed of 1m/s, with 0.5m/s operation 3s, with 0.2m/s operation 3s, still turn again 0.5s to the heavy rail rear frequency conversion roller-way of raming, make heavy rail eliminate bounce-back, the heavy rail end face with ram close contact;
After length saw, the processing of brill building-block machine, selected length measuring device decline magnetic valve is charged, hydraulic oil is through the parallel position of solenoid directional control valve, Electrohydraulic push rod stretches out and promotes fork forearm retraction, fork front end top wheel and the lifter plate that is pressed against on the wheel of top descend simultaneously, time-delay 2s outage after descending, the upper surface of raming is lower than roller-way 30mm, namely finishes the scale process one time;
If the change cut lengths is used another set of length measuring device, only need the selected another set of length measuring device of length saw, then come again said process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910187812 CN102039537B (en) | 2009-10-10 | 2009-10-10 | Heavy rail sizing device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910187812 CN102039537B (en) | 2009-10-10 | 2009-10-10 | Heavy rail sizing device and method |
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| CN102039537A CN102039537A (en) | 2011-05-04 |
| CN102039537B true CN102039537B (en) | 2013-05-01 |
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| CN 200910187812 Active CN102039537B (en) | 2009-10-10 | 2009-10-10 | Heavy rail sizing device and method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102305088B (en) * | 2011-08-05 | 2013-10-02 | 大连华锐重工集团股份有限公司 | Duct piece transporter for small-diameter shield machine and operating method of duct piece transporter |
| CN109209370B (en) * | 2018-09-28 | 2023-08-22 | 招远华丰机械设备有限公司 | Underground wool prying vehicle |
| CN113751625B (en) * | 2021-08-26 | 2024-03-22 | 山东省冶金设计院股份有限公司 | Lifting baffle device of length-changing length-setting machine and length-setting shearing method |
| CN113858078B (en) * | 2021-10-25 | 2023-04-07 | 山东瑞博电机有限公司 | Clamp for machining three-phase asynchronous motor shell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2045654A (en) * | 1979-03-22 | 1980-11-05 | Crosfield Electronics Ltd | Work holding mechanisms |
| US4243084A (en) * | 1979-07-27 | 1981-01-06 | Cranston Machinery Co., Inc. | Door sizing machine |
| CN2088461U (en) * | 1991-04-30 | 1991-11-13 | 涟源钢铁总厂 | Pendulum type size fixing machine |
| CZ284730B6 (en) * | 1997-06-11 | 1999-02-17 | Třinecké Železárny A. S. | Method of exact positioning of bodies and apparatus for making the same |
| CN2701547Y (en) * | 2004-06-21 | 2005-05-25 | 北京科技大学 | Length shear gauge for cut deals |
-
2009
- 2009-10-10 CN CN 200910187812 patent/CN102039537B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2045654A (en) * | 1979-03-22 | 1980-11-05 | Crosfield Electronics Ltd | Work holding mechanisms |
| US4243084A (en) * | 1979-07-27 | 1981-01-06 | Cranston Machinery Co., Inc. | Door sizing machine |
| CN2088461U (en) * | 1991-04-30 | 1991-11-13 | 涟源钢铁总厂 | Pendulum type size fixing machine |
| CZ284730B6 (en) * | 1997-06-11 | 1999-02-17 | Třinecké Železárny A. S. | Method of exact positioning of bodies and apparatus for making the same |
| CN2701547Y (en) * | 2004-06-21 | 2005-05-25 | 北京科技大学 | Length shear gauge for cut deals |
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