CN104723172B - A kind of steel plate shear gauge and its method for scaling - Google Patents
A kind of steel plate shear gauge and its method for scaling Download PDFInfo
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- CN104723172B CN104723172B CN201510133619.4A CN201510133619A CN104723172B CN 104723172 B CN104723172 B CN 104723172B CN 201510133619 A CN201510133619 A CN 201510133619A CN 104723172 B CN104723172 B CN 104723172B
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- steel plate
- scale
- shear gauge
- dolly
- drive motor
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D33/00—Accessories for shearing machines or shearing devices
- B23D33/10—Stops for positioning work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Accessories And Tools For Shearing Machines (AREA)
Abstract
The invention provides a kind of steel plate shear gauge, conveying mechanism including scale dolly, trolley drive motor and for conveying steel plate, conveying direction of the top of conveying mechanism along steel plate is parallel to be provided with two racks, scale dolly lower end is equipped with the gear for walking, wheel and rack is meshed, and gear is arranged on by reductor on the output shaft of trolley drive motor；Encoder is equipped with the output shaft of trolley drive motor, trolley drive motor connects a frequency converter, and described frequency converter, encoder are connected on a controller；Also including one is used for the fixed ruler baffle of fixing steel plate, and the fixed ruler baffle is fixed on scale dolly by elevating mechanism.A kind of steel plate shear gauge method for scaling is additionally provided, by the output frequency of Discrete control frequency converter, the Discrete control to trolley drive motor rotating speed is realized.The present invention largely improves the sizing accuracy of shear gauge.
Description
Technical field
The present invention relates to a kind of shear gauge and method for scaling, specifically a kind of steel plate shear gauge and its method for scaling.
Background technology
It is well known that sizing accuracy is influence lumber recovery, the key factor of steel scrap rate, length measuring device is the investment of influence steel mill
One of key of cost.Shear gauge is a kind of conventional length measuring device.Existing shear gauge mainly passes through motor direct-drive
Scale dolly adhesion wheel or rack-and-pinion mode, to realize scale dolly moving horizontally in orbit, when scale dolly reaches
Stop, respectively positioned scale dolly with track from scale dolly both sides during to precalculated position by alignment pin, prevent
Only dolly is moved.This mode for preventing scale dolly from moving, it is cumbersome, influence the scale efficiency of shear gauge；And it is above-mentioned fixed
It is not easily taken out, not only bad for the regulation of shear gauge cut lengths, and during using positioning finger setting, can also causes during the pin conquassation of position
The change of the small truck position of scale, so as to influence the sizing accuracy of shear gauge.
In addition, generally shear gauge is placed in after the shearing equipments such as cutter or saw in the prior art, coordinate shear gauge
Carry out scale.And during the scale of above-mentioned scale, existing shear gauge generally uses formula for v=k × e automatic gauging mould
Type carries out the scale of steel plate, wherein, above-mentioned v represents the given speed of above-mentioned motor, and e represents the reality of above-mentioned steel plate scale
The difference of length value and default steel plate scale, K represents proportionality constant.In above-mentioned automatic gauging Controlling model, the size of K values is direct
The dynamic response of influence system, K values then system transients response change bigger than normal is big, easily causes system unstable；K values are less than normal, cause
Transient response change is small, and the response time is long.Therefore, the change of K values causes system steady-state error easily occur, so that can be in very great Cheng
The sizing accuracy of steel plate is influenceed on degree.
This is the deficiencies in the prior art.
The content of the invention
The technical problems to be solved by the invention are that there is provided a kind of steel plate scale for problems of the prior art
Machine and its method for scaling, the sizing accuracy for improving shear gauge.
In order to solve the problems of the prior art, the invention provides a kind of steel plate shear gauge, including scale dolly, it is used for
The trolley drive motor of scale dolly movement and the conveying mechanism for conveying steel plate are driven, the top of conveying mechanism is parallel to be provided with
Two racks, conveying direction distribution of the rack along steel plate, scale dolly is located at the top of rack, and the lower end of scale dolly is equipped with
For the gear of walking, the gear is meshed with described rack, and the gear is arranged on dolly by reductor and drives electricity
On the output shaft of machine；Encoder is equipped with the output shaft of trolley drive motor, trolley drive motor connects a frequency converter, described
Frequency converter, encoder are connected on a controller；Also including one is used for the fixed ruler baffle of fixing steel plate, and the fixed ruler baffle passes through
Elevating mechanism is fixed on scale dolly.
Described elevating mechanism includes being used for the barrier driving motor for driving fixed ruler baffle rise and fall and rotatable
Eccentric shaft on fixed ruler baffle, the axial line and fixed ruler baffle of eccentric shaft is perpendicular, eccentric shaft and barrier driving motor
Output shaft be coaxially connected；The elevating mechanism also includes an expansion link, and the two ends of the expansion link are respectively hinged at scale dolly
Bottom and fixed ruler baffle on.
Described trolley drive motor, reductor and barrier driving motor is separately mounted on scale dolly.
Encoder uses absolute value encoder.
The side of the rack is provided with scale, and the scale is parallel with rack.The use of scale, is easy to more intuitively
Observe the actual cut lengths of shear gauge.
Present invention also offers a kind of steel plate shear gauge method for scaling, it is characterised in that including：
Step A, the actual range L that measurement scale dolly is moved by initial position to current location in real time；
Step B, actual range L in real time according to above-mentioned measurement, and the scale on initial position demarcated in advance
The initial interval S between fixed ruler baffle and shearing equipment on dolly, calculates the scale on the scale dolly in current location
Interval S L, SL=L+S between baffle plate and the shearing equipment；
Step C, calculate in real time above-mentioned interval S L and default steel plate scale L0 difference absolute value e, 0≤e；
Step D, the absolute value e calculated is subjected to sizes with multiple default difference thresholds compared, according to comparative result
Control the output frequency v of frequency converter；
Step E, as the output frequency v=0 of frequency converter, scale dolly locking, then described interval S L be steel plate reality
Border sheared length；Otherwise, the rotating speed of trolley drive motor is controlled by the output frequency v of frequency converter, and continues executing with step A.
Wherein, the scale dolly locking described in step E refers to that the given rotating speed of trolley drive motor is 0, now scale
Dolly stops movement.
In above-mentioned steps C, default difference threshold is x1、x2And x3, wherein 0 ＜ x1＜ x2＜ x3。
It is described to control the output frequency v of the frequency converter control method to be according to comparative result：
As e ＞ x3When, 37≤v≤40；
Work as x2≤e≤x3When, 32≤v≤37；
Work as x1＜ e ＜ x2When, v=0.2 × e+2；
As 0≤e≤x1When, v=0；
Wherein, v represents the output frequency of the frequency converter, and e is the absolute value of the difference calculated in step B.
Wherein, v is divided to for 37≤v≤40 and 32≤v≤37 two stage by the above-mentioned size according to absolute value e, both can be with
Accelerate the translational speed of scale dolly, can prevent from causing scale dolly to be not easy to quick deceleration because scale dolly inertia is excessive again
Phenomenon occur, this can improve to scale dolly translational speed control flexibility, so as to improve the sizing accuracy of shear gauge.
In addition, working as x1＜ e ＜ x2When, v=0.2 × e+2 uses " 2 " to do compensation rate, can both eliminate causes because coefficient " 0.2 " is less than normal
Phenomenon of the system without response, can accelerate the corresponding speed of system again.
Preferably, x1=1mm, x2=150mm, x3=500mm.
In above-mentioned steps A, the actual range L's that measurement scale dolly is moved by initial position to current location in real time
Method is：Encoder is arranged on to the output shaft for the trolley drive motor for being used for driving scale dolly to move, passes through encoder
The rotating speed of trolley drive motor is fed back, described actual range L is calculated by the information of encoder feedback.
The beneficial effects of the invention are as follows：
(1) steel plate shear gauge of the present invention, is provided with two racks the top of conveying mechanism is parallel, and two racks are along steel plate
Conveying direction distribution, scale dolly is located at the top of rack, and the lower end of scale dolly is equipped with the gear for walking, the tooth
Wheel is meshed with described rack respectively, and the gear is arranged on by reductor on the output shaft of trolley drive motor；Wherein,
Rack and pinion is used cooperatively, and cooperative achievement scale dolly is moved along conveying mechanism, is easy to fine-tune the scale of shear gauge,
So as to improve the sizing accuracy of shear gauge；In addition, two racks are applied not only to realize the movement of scale dolly, and rack and pinion
Intermeshing so that be easy to position scale dolly, in use, the output speed that need to only control trolley drive motor is 0,
Located lateral can be carried out to dolly, this can largely be avoided cumbersome to positioning trolley position fixing process in the prior art
Deficiency, it is more practical.
(2) steel plate shear gauge method for scaling of the present invention, using the compound scale model of segmented, can not only be improved
The stability of shear gauge scale, can also largely improve the sizing accuracy of shear gauge.
Brief description of the drawings
Fig. 1 is the structural representation for inventing the steel plate shear gauge；
Fig. 2 is the structural representation of the drive mechanism of scale dolly and fixed ruler baffle described in Fig. 1；
Fig. 3 is the structural representation of expansion link shown in Fig. 1；
Fig. 4 is the method flow diagram of steel plate shear gauge method for scaling of the present invention；
Fig. 5 is a kind of implementation method flow chart of step D shown in Fig. 4.
Wherein：1 is shearing equipment, and 2 be scale dolly, and 3 be conveying mechanism, and 4 be steel plate, and 5 be reductor, and 6 be rack, 7
For gear, 8 be trolley drive motor, and 9 be encoder, and 10 be output shaft, 11, fixed ruler baffle, 12 be eccentric shaft, and 13 be that baffle plate drives
Dynamic motor, 14 be expansion link, and 15 be scale, 16, output shaft, 17 be output shaft, and 18 be flexible rod set, and 19 be positioning hole, and 20 are
Alignment pin, 21 be connecting rod, 22, positioning hole.
Embodiment
To make technical scheme and advantage clearer, below in conjunction with the accompanying drawing of the present invention, to the present invention's
Technical scheme is clearly and completely described.Wherein, present embodiment explanation by taking the steel Heavy Plate Plant shear gauge that helps as an example.
Fig. 1, Fig. 2 for the present invention a kind of steel plate shear gauge, including scale dolly 2, for drive scale dolly 2 move
Trolley drive motor 8 and the conveying mechanism 3 for conveying steel plate 4, the top of conveying mechanism 3 is parallel to be provided with two racks 6, the tooth
Conveying direction distribution of the bar 6 along steel plate 4, scale dolly 2 is located at the top of rack 6, and the lower end of scale dolly 2, which is equipped with, to be used to walk
Gear 7, the gear 7 is meshed with described rack 6, and the gear 7 is arranged on trolley drive motor 8 by reductor 5
Output shaft 10 on；Encoder 9 is equipped with the output shaft 10 of trolley drive motor 8, trolley drive motor 8 connects a frequency converter,
Described frequency converter, encoder 9 are connected on a controller；Also including one is used for the fixed ruler baffle 11 of fixing steel plate 4, described fixed
Chi baffle plate 11 is fixed on scale dolly 2 by elevating mechanism.Wherein, encoder 9 uses absolute value encoder, for anti-in real time
Present trolley drive motor 8 rotate the number of turns, so that it is determined that scale dolly 2 by initial position to current location moved actually away from
From.
Before use, the fixed ruler baffle 11 first on scale dolly 2 of the demarcation in initial position arrives preset cutter
Or the initial spacing between the shearing equipment 1 such as saw, after demarcation is completed, the initial bit of fixed shear equipment 1 and scale dolly 2
Put.In use, scale dolly 2 is under the driving of trolley drive motor 8, moved on rack 6, encoder 9 is real anti-to controller
The number of turns that trolley drive motor 8 is rotated is presented, after certain control condition is reached, trolley drive motor 8 stops operating, Zhi Houtong
Elevating mechanism regulation fixed ruler baffle 11 is crossed to decline.In use, steel plate 4 is fed forward by conveying mechanism 3, until steel plate 4 is touched
To described fixed ruler baffle, now, between the fixed ruler baffle 11 and shearing equipment 1 on the scale dolly 2 in current location between
Actual shearing length away from as steel plate.
Described elevating mechanism is included for driving the barrier driving motor 13 of the rise and fall of fixed ruler baffle 11 and can turn
The dynamic eccentric shaft 12 being arranged on fixed ruler baffle 11, the axial line and fixed ruler baffle 11 of eccentric shaft 12 is perpendicular, eccentric shaft 12
With the output shaft 16 of barrier driving motor 13 is coaxial is connected；The elevating mechanism also includes an expansion link 14, the expansion link 14
Two ends are respectively hinged on the bottom of scale dolly 2 and fixed ruler baffle 11.
Described expansion link 14 is enclosed on the connecting rod 21 in flexible rod set 18 including flexible rod set 18 and one end, rod set 18 of stretching
Positioning hole 19 and alignment pin 20 are provided with, connecting rod 21 is provided with and used cooperatively with the positioning hole 19 and alignment pin 20 on expansion link 14
Positioning hole 22, as shown in Figure 3.In use, removing alignment pin 20, adjusting fixed ruler baffle 11 by barrier driving motor 13 rises
Or decline, after regulation is finished, fixed ruler baffle 11 is positioned by alignment pin 20.
Wherein, described trolley drive motor 8, reductor 5 and barrier driving motor 13 are separately mounted to scale dolly 2
On.
The side of the rack 6 is provided with scale 15, and the scale 15 is parallel with rack 6.The use of scale 15, is easy to more
Intuitively to observe the actual cut lengths of shear gauge.
Wherein, output shaft 17 is the output shaft of reductor 5.In the present embodiment, described reductor 5 is 1:40 turbines
Worm decelerating machine.
Present invention also offers a kind of steel plate shear gauge method for scaling, as shown in figure 4, including：
Step A, the actual range L that measurement scale dolly is moved by initial position to current location in real time；
Step B, actual range L in real time according to above-mentioned measurement, and the scale on initial position demarcated in advance
The initial interval S between fixed ruler baffle and shearing equipment on dolly, calculates the scale on the scale dolly in current location
Interval S L, SL=L+S between baffle plate and the shearing equipment；
Step C, calculate in real time above-mentioned interval S L and default steel plate scale L0 difference absolute value e, 0≤e；
Step D, the absolute value e calculated is subjected to sizes with multiple default difference thresholds compared, according to comparative result
Control the output frequency v of frequency converter；
Step E, as the output frequency v=0 of frequency converter, scale dolly locking, then described interval S L be steel plate reality
Border sheared length；Otherwise, the rotating speed of trolley drive motor is controlled by the output frequency v of frequency converter, and continues executing with step A.
Wherein, above-mentioned default difference threshold has x1、x2And x3, 0 ＜ x1＜ x2＜ x3.And in the present embodiment,
x1=1mm, x2=150mm, x3=500mm, and have
Wherein, v represents the output frequency of frequency converter, that is, represents the given frequency of motor described in the transducer drive
Rate, unit is hz；The difference that e is the interval S L and default steel plate scale L0 calculated by step B.
The method for the actual range L that measurement scale dolly 2 is moved by initial position to current location is in real time：Will coding
Device 9 is arranged on the output shaft 10 of trolley drive motor 8, and the rotating speed of trolley drive motor 8 is fed back by encoder 9, by compiling
The code feedack of device 9 calculates described actual range L.Wherein, described encoder 9 uses absolute value encoder.
Wherein, the calculation formula for the actual range L that above-mentioned scale dolly 2 is moved by initial position to current location is：
L=(EU-EUMin) × [(LMax-Lmin)/(EUMax-EUMin)],
Wherein, LMax is the current location of scale dolly 2, and LMin is the initial position of scale dolly 2；EU is encoder 9
Actual value, EUMax is the code value of correspondence encoder 9 when scale dolly 2 is in current location, and EUMin is that scale dolly 2 is in just
The code value of corresponding encoder 9 during beginning position.
In use, trolley drive motor 8 drives scale dolly 2 to be moved on rack 6, the Real-time Feedback dolly of encoder 9 drives
The rotating speed of dynamic motor 8, and described actual range L is calculated by the feedack of encoder 9, so that according to above-mentioned measurement
Actual range L and the initial interval S demarcated in advance, calculate fixed ruler baffle 11 on the scale dolly 2 in current location with
The interval S L of cutter, and SL=S+L；The absolute value e of interval S L and default steel plate scale L0 difference is calculated afterwards,
And by the absolute value e calculated and default difference threshold x1=1mm, x2=150mm and x3=500mm carries out size comparison, root
The output frequency v of frequency converter is controlled according to comparative result, as shown in Figure 5：
As e ＞ 500, v=40hz；
Otherwise as 150≤e≤500, v=32hz；
Otherwise as 1 ＜ e ＜ 150, v=0.2 × e+2；
Otherwise as 0≤e≤1, v=0.
Wherein, during above-mentioned v=0, the given rotating speed of trolley drive motor 8 is 0, that is, realizes the locking of scale dolly 2.
The output frequency v of frequency converter of the present invention is the given frequency of trolley drive motor 8, that is, passes through the defeated of frequency converter
Go out the rotating speed that frequency v controls trolley drive motor 8, it is achieved thereby that to the Discrete control of the rotating speed of trolley drive motor 8, this both existed
The quick movement of scale dolly 2 is largely ensure that, and largely ensure that the flexibility that scale dolly 2 slows down
Control, improves the positioning precision of scale dolly 2, and then improve the positioning precision of shear gauge.
The experiment proved that, after this steel plate shear gauge method for scaling comes into operation, by the control of the sizing accuracy of steel plate ±
1mm, largely eliminates the quantity for the out-of-size steel plate section sheared, makes steel plate oven improvement from 0.165%
Drop to 0.095%；In addition, every steel plate length in reserve shortens to 15mm by conventional 45mm, the slitter edge rate of recovery of steel plate by
Conventional 10% brings up to 20%.
Claims (9)
1. a kind of steel plate shear gauge method for scaling, it is characterised in that
Described steel plate shear gauge includes scale dolly, the trolley drive motor for driving the movement of scale dolly and for conveying
The conveying mechanism of steel plate, it is characterised in that the top of conveying mechanism is parallel to be provided with two racks, conveying side of the rack along steel plate
To distribution, scale dolly is located at the top of rack, and the lower end of scale dolly is equipped with the gear for walking, the gear with it is described
Rack be meshed, the gear by reductor be arranged on trolley drive motor output shaft on；Trolley drive motor it is defeated
Encoder is equipped with shaft, trolley drive motor connects a frequency converter, and described frequency converter, encoder are connected to a controller
On；Also including one is used for the fixed ruler baffle of fixing steel plate, and the fixed ruler baffle is fixed on scale dolly by elevating mechanism；
The method for scaling of the steel plate shear gauge includes：
Step A, the actual range L that measurement scale dolly is moved by initial position to current location in real time；
Step B, actual range L in real time according to above-mentioned measurement, and the scale dolly on initial position demarcated in advance
On fixed ruler baffle and shearing equipment between initial interval S, calculate in current location scale dolly on fixed ruler baffle
Interval S L, SL=L+S between the shearing equipment；
Step C, calculate in real time above-mentioned interval S L and default steel plate scale L0 difference absolute value e, 0≤e；
Step D, the absolute value e calculated is subjected to sizes with multiple default difference thresholds compared, according to comparative result control
The output frequency v of frequency converter；
Step E, as the output frequency v=0 of frequency converter, scale dolly locking, then described interval S L actually being cut for steel plate
Cut length；Otherwise, the rotating speed of trolley drive motor is controlled by the output frequency v of frequency converter, and continues executing with step A.
2. steel plate shear gauge method for scaling according to claim 1, it is characterised in that in step C, default difference threshold
It is worth for x1、x2And x3, wherein 0 ＜ x1＜ x2＜ x3。
3. steel plate shear gauge method for scaling according to claim 2, it is characterised in that described according to comparative result control
The output frequency v of frequency converter control method is：
As e ＞ x3When, 37≤v≤40；
Work as x2≤e≤x3When, 32≤v≤37；
Work as x1＜ e ＜ x2When, v=0.2 × e+2；
As 0≤e≤x1When, v=0；
Wherein, v represents the output frequency of the frequency converter, and e is the absolute value of the difference calculated in step B.
4. steel plate shear gauge method for scaling according to claim 3, it is characterised in that x1=1mm, x2=150mm, x3=
500mm。
5. the steel plate shear gauge method for scaling according to claim 1 or 2 or 3 or 4, it is characterised in that in step, real
When the actual range L method that is moved by initial position to current location of measurement scale dolly be：Encoder is arranged on and used
In on the output shaft of the trolley drive motor of driving scale dolly movement, by the rotating speed of encoder feedback trolley drive motor,
Described actual range L is calculated by the information of encoder feedback.
6. steel plate shear gauge method for scaling according to claim 1, it is characterised in that the lift of the steel plate shear gauge
Structure includes the barrier driving motor for driving fixed ruler baffle rise and fall and is rotatably arranged on inclined on fixed ruler baffle
Heart axle, the axial line and fixed ruler baffle of eccentric shaft is perpendicular, and eccentric shaft is coaxially connected with the output shaft of barrier driving motor；The liter
Descending mechanism also includes an expansion link, and the two ends of the expansion link are respectively hinged on the bottom and fixed ruler baffle of scale dolly.
7. steel plate shear gauge method for scaling according to claim 6, it is characterised in that the dolly of the steel plate shear gauge drives
Dynamic motor, reductor and barrier driving motor are separately mounted on scale dolly.
8. the steel plate shear gauge method for scaling according to claim 1 or 6 or 7, it is characterised in that the steel plate shear gauge
Encoder uses absolute value encoder.
9. the steel plate shear gauge method for scaling according to claim 1 or 6 or 7, it is characterised in that the steel plate shear gauge
The side of rack is provided with scale, and the scale is parallel with rack.
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| CN201510133619.4A CN104723172B (en) | 2015-03-25 | 2015-03-25 | A kind of steel plate shear gauge and its method for scaling |
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| CN201510133619.4A CN104723172B (en) | 2015-03-25 | 2015-03-25 | A kind of steel plate shear gauge and its method for scaling |
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| CN105537721B (en) * | 2016-02-24 | 2018-11-16 | 山信软件股份有限公司 | A kind of fire cuts machine-cut burning torch localization method and device |
| CN105751009B (en) * | 2016-03-03 | 2017-11-21 | 山东钢铁股份有限公司 | A kind of scale control method of circular big rod |
| CN106975791B (en) * | 2017-05-03 | 2018-03-20 | 新疆源盛科技发展有限公司 | Positioning rule and positioning ruler system |
| CN108274065B (en) * | 2018-01-19 | 2020-04-14 | 山东钢铁集团日照有限公司 | Sizing baffle protection system and control method |
| CN112777535B (en) * | 2021-02-18 | 2023-03-28 | 胡兵 | High-rise building operation platform |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5283751A (en) * | 1990-04-24 | 1994-02-01 | Tornos-Bechler Sa, Fabrique De Machines Moutier | Control device and method for an incremental numerical axis in a machining station |
| JP3112294B2 (en) * | 1991-02-15 | 2000-11-27 | 株式会社アマダ | Actuator positioning control device for machine tools |
| CN202344025U (en) * | 2011-11-14 | 2012-07-25 | 湖南华菱湘潭钢铁有限公司 | Simple length-measuring device for length-measuring scissors |
| CN203003243U (en) * | 2012-12-05 | 2013-06-19 | 南京钢铁股份有限公司 | Swing type cutting-to-length machine lower tool apron with slitter edge removal function |
| CN203438010U (en) * | 2013-07-23 | 2014-02-19 | 济南同济机械有限公司 | Fixed length measuring device |
| CN203526693U (en) * | 2013-09-10 | 2014-04-09 | 北京中冶设备研究设计总院有限公司 | Trolley positioning device of size determining machine |
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