CN102000699B - Roll mark spot wiper for rolling mill - Google Patents
Roll mark spot wiper for rolling mill Download PDFInfo
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- CN102000699B CN102000699B CN 200910194756 CN200910194756A CN102000699B CN 102000699 B CN102000699 B CN 102000699B CN 200910194756 CN200910194756 CN 200910194756 CN 200910194756 A CN200910194756 A CN 200910194756A CN 102000699 B CN102000699 B CN 102000699B
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- roll shaft
- active section
- support bar
- wiper
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- 238000005096 rolling process Methods 0.000 title claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 9
- 230000006698 induction Effects 0.000 claims description 6
- 230000008054 signal transmission Effects 0.000 claims description 3
- 241000397426 Centroberyx lineatus Species 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 13
- 238000004140 cleaning Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
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Abstract
一种用于轧钢机的辊印污渍擦拭器，包括由电机驱动的滑动螺旋副，滑动螺旋副包括与辊轴工作段平行设置的丝杆，丝杆上设有与辊轴工作段相对的螺纹段，且丝杆螺纹段的长度大于或等于辊轴工作段的长度，丝杆螺纹段上设有与其相配合的螺母，螺母朝向辊轴工作段的一侧固定有气缸，气缸内的活塞上设有活塞杆伸出气缸外，活塞杆伸出的一端上设有擦拭头，且工作位置上的擦拭头与辊轴工作段的外表面相接触。本擦拭器的擦拭过程无须手动，彻底杜绝了人工擦辊过程中的各种安全隐患，保障了工人的安全生产；能够及时清除辊轴表面的污渍、清擦效果理想，产品质量得到了保障；更换辊轴的时间间隔延长，降低了产品的生产成本；操作简单方便、维护保养成本低。
A roller print stain wiper for a rolling mill, including a sliding screw pair driven by a motor, the sliding screw pair includes a screw rod arranged parallel to the working section of the roller shaft, and the screw rod is provided with a screw thread opposite to the working section of the roller shaft section, and the length of the threaded section of the screw rod is greater than or equal to the length of the working section of the roller shaft. The threaded section of the screw rod is provided with a nut that matches it. A piston rod extends out of the cylinder, and a wiping head is provided on the protruding end of the piston rod, and the wiping head at the working position is in contact with the outer surface of the working section of the roller shaft. The wiping process of this wiper does not need to be done manually, which completely eliminates various safety hazards in the manual roller wiping process and ensures the safe production of workers; it can remove the stains on the surface of the roller shaft in time, the cleaning effect is ideal, and the product quality is guaranteed; The time interval for replacing the roller shaft is extended, which reduces the production cost of the product; the operation is simple and convenient, and the maintenance cost is low.
Description
Technical field
The present invention relates to rolling mill, refer more particularly to the roll shaft cleaning of rolling mill.
Background technology
During modern steel is produced, pair of parallel commonly used is arranged, the roll shaft of reverse rotation comes rolled plate, roll shaft to the material high-pressure, utilizes the shearing force between two roll shafts under the effect of hydraulic system pressure, can will continue to offset by the steel ingot of pressure area between two roll shafts.But in process, the tiny chip of steel ingot is adhered in the meeting that cannot avoid on the roll shaft, these chips can stay on the surface of rolled parts cut and hole hole, i.e. roll marks in the operation of rolling, thereby the surface accuracy of influence of rolled spare, even can cause scrapping of rolled parts.
Remove at present the method for roll shaft surface blot mainly in two steps; at first be to remove manually; the crew uses manual wiping roller device (combination of wooden stick and wiping head) wiping is carried out on the roll shaft surface that produces roll marks; because the roll shaft outer surface is periphery; the cleaning angle is large, cleaning effect often undesirable, efficient is not high yet; the more important thing is, in this course because working roll is non-stop-machine, so whole artificial wiping roller process exists very large potential safety hazard.In addition; because artificial wiping roller cleaning effect is bad; how long have more than is needed roll shaft often make; normally several hours; when the rolled parts surface accuracy that processes when the roll shaft of artificial cleaning does not reach and requires; will carry out second step: shut down and change working roll, whole roll change work need be shut down more than 30 minutes, so will affect the output of whole unit.Because the roll shaft of changing must could continue by the processing of follow-up lathe to use, the production cost of product is further risen again.
Summary of the invention
Technical problem to be solved by this invention mainly is to provide a kind of device that can clean timely and effectively the roll shaft surface in the roll shaft process.
The present invention is achieved by the following technical solutions:
A kind of roll mark spot wiper for rolling mill, it is characterized in that: described wiper comprises by motor-driven sliding spiral pair, sliding spiral pair comprises the screw mandrel that be arranged in parallel with the roll shaft active section, screw mandrel is provided with the thread segment relative with the roll shaft active section, and the length of wire rod thread section is more than or equal to the length of roll shaft active section, the wire rod thread section is provided with the nut that matches with it, nut is fixed with cylinder towards a side of roll shaft active section, piston in the cylinder is provided with piston rod and stretches out outside the cylinder, the end that piston rod stretches out is provided with the wiping head, and the wiping head on the operating position contacts with the outer surface of roll shaft active section.
In when work, the rodless cavity of cylinder constantly has pressed gas to inject, and piston rod is stretched out, the wiping head on the piston rod just with rotate in the working roll outer circumference surface contact, and keep this invariant position; This moment starter motor, the motor-driven screw mandrel, screw mandrel is rotated, nut on the wire rod thread section under the drive of screw mandrel along screw axis to moving linearly, thereby drive moving horizontally of wiping head on the cylinder realization piston rod be fixedly connected with nut, and then reach the purpose of wiping clearly the roll shaft outer circumference surface.Because screw mandrel and roll shaft be arranged in parallel, so the wiping head can contact with the roll shaft outer circumference surface in the process that moves horizontally always; Because the length of thread segment is corresponding more than or equal to axial length and both positions of spiral shell axle active section on the screw mandrel, so when the wiping head moves to the other end from wire rod thread Duan Yiduan, can clean the outer circumference surface of whole roll shaft active section comprehensively; Simultaneously, by regulating the pressure by the pressed gas of piston below, can control the dynamics of a wiping wiping, also can regulate the wiping head to the speed that roll shaft moves, avoid excessive velocities wiping head to impinge upon on the roll shaft.
Further, in actual use, consider that roll shaft is longer, its active section length is usually more than 1M, the screw mandrel length that adapts with it is also more than 1M, the wiping head can be subject to the radial reaction force of roll shaft in the process of wiping roll shaft, this power passes to screw mandrel by the nut that moves horizontally on the screw mandrel, elongated screw mandrel easily produces flexural deformation under the effect of long-time radial load, therefore can increase a support bar and be used for holding nut, thereby increase the rigidity of screw mandrel, avoid the screw mandrel distortion.Support bar and roll shaft lay respectively at the screw mandrel both sides, three's axis is in same plane and parallel to each other, the support bar active section is corresponding with the wire rod thread section, and the length of strut active section is more than or equal to the length of wire rod thread section, support bar can contact with the outer surface of nut with the support bar outer surface with distance between the screw mandrel or gapped being advisable slightly, and the gap is generally in the scope of 0.5mm～0.7mm.
Further again, consider in the course of the work, the outer surface of nut slides at support bar, gets off for a long time, and the wearing and tearing meeting of nut and the contacted outer surface of support bar is larger, therefore, axial pass trough can be offered in the position of matching with support bar on the nut excircle, groove two side and/or bottom land arrange wear block, and part or all of support bar is positioned at groove, and support bar only contacts with friction block, and is separated with friction block or leaves the gap between the bottom land of groove, cell wall.
Wear block can be made by the softer tin bronze of quality, the outer circumference surface of nut when support bar slides, wearing and tearing be wear block, basically do not produce wearing and tearing between support bar and the nut.After wear block is used a period of time, can change after the excessive wear.
Further again, for the layout that makes whole equipment is more compact, preferred piston rod is straight-bar, and piston rod is mutually vertical with the roll shaft axis, and the thread segment on the screw mandrel and the active section on the support bar be the active section on the roll shaft all.
Because the wiping head only is supported on the roll shaft outer circumference surface by piston rod and relatively rotates and move horizontally, piston easily produces in the process that ejects and swings, the wiping head is prone to creeping phenomenon in the process of clear wiping working roll, the action of wiping is unstable, therefore cylinder can be fixedly connected with nut by support, the end that piston rod stretches out cylinder is provided with travel(l)ing rest and is connected with the wiping head, guide post one end parallel with piston rod is fixed on the travel(l)ing rest, other end activity is stretched in the fairlead on the support, the setting of guide post and fairlead, the direction of motion that can guarantee piston only is along on the cylinder-bore axis, descending, avoid a wiping fluctuation of service.
Further again, the position that the wiping head is connected with travel(l)ing rest can be processed as the form that dovetail groove cooperates: wiping head bottom is processed as swallow-tail form, be big top and small bottom trapezoidal, travel(l)ing rest is provided with dovetail groove with matching, because the wiping headband has certain elastomer material material to make, therefore the dovetail of wiping head partly slightly can be inserted after the compression in the dovetail groove on the travel(l)ing rest and fix, installing/dismounting is easy like this, and fixation degree is reliable.
Further again, can set up travel switch and link to each other with motor by control circuit, this is because the rotation of screw mandrel makes nut make linear slide, owing to sliding distance, being the restriction of thread segment length, screw rod must reverse when nut is positioned at extreme position, thereby makes the nut reverse slide.The rotating of screw rod realizes by the control motor positive and inverse, motor positive and inverse can be by manually control, also can control by travel switch, during work, press lower stroke switch, electric motor starting, after after a while, the wiping head moves to an end of wire rod thread section, travel switch work this moment, control motor reversal, a wiping counter motion, so circulation.
Further again, the threaded portion of preferred screw mandrel adopts one start screw, when motor outage rear screw partly can be good at self-locking, makes things convenient for equipment in time to stop.Simultaneously, sliding spiral pair has adopted trapezoidal thread transmission commonly used, the angle of thread of screw thread, refer to that namely the adjacent two tooth top-cross angles of screw thread are 30 °, the large footpath of the screw thread pair of this thread form and path place have that equal radial clearance, root of the tooth intensity are high, the good manufacturability of screw thread, internal and external threads with the conical surface fit, centering is good, it is loosening to be difficult for.
The present invention has following beneficial effect:
1. because this whole process that is used for the roll mark spot wiper of rolling mill is all carried out automatically, thoroughly stop the various potential safety hazards in the artificial wiping roller process, ensured workman's safety in production;
2. because in process of production, in case the roll shaft surface produces spot or product surface is found roll marks, operating personnel will carry out cleaning to the work roll surface that spot is arranged at once by this device, can in time remove the spot on roll shaft surface, distance between wiping head and work roll surface need not too much adjustment, wipes satisfactory for resultly clearly, and product quality has obtained maximum guarantee;
3. owing to the spot that can remove timely and effectively for the roll mark spot wiper of rolling mill on the roll shaft, the time interval of therefore changing roll shaft is extended for 2 times of artificial wiping roller, greatly reduces the production cost of product;
4. owing to utilizing travel switch to realize automatically wiping roller, can further reduce workman's operation easier, simple to operation, easy left-hand seat;
5. the present invention is simple in structure, the maintaining cost is low, substantially can not cause extra financial burden to enterprise.
Description of drawings
Fig. 1 is the front view of a kind of preferred version of the present invention
Fig. 2 is the left view of Fig. 1
Fig. 3 is that the wiping head cooperates schematic diagram with the amplification of travel(l)ing rest
Fig. 4 is that the amplification of nut, friction block and support bar cooperates schematic diagram
Among Fig. 1-4: 1 is the roll shaft active section, and 2 is screw mandrel, and 3 is the thread segment on the screw mandrel, and 4 is bearing, 5 is bearing block, and 6 is base, and 7 is support bar, and 8 is travel(l)ing rest, 9 is nut, and 10 are the wiping head, and 11 is guide post, and 12 is fairlead, 13 is piston rod, and 14 is piston, and 15 is support, and 16 is shaft joint, 17 is reduction box, and 18 is motor, and 19 is the groove of nut bottom, and 20 is friction block, 21 is spacing inductor, and 22 is travel switch, and 23 is the signal transmission line road, and 24 is control circuit.
Specific implementation method
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is the front view of a preferred embodiment of the present invention, screw mandrel 2 is by bearing 4, bearing block 5 is installed on the base 6, thread segment 3 on the screw mandrel be positioned at roll shaft active section 1 under, the transmission of power and the kind of drive of changing the employing screw pair, the output shaft of motor 18 is by reduction box 17, shaft coupling 16 links to each other with screw mandrel 2, cover has a nut 9 that cooperates with it on the wire rod thread section 3, nut 9 tops, one side of nearly roll shaft active section 1 is installed a support 15, cylinder 14 is housed on the support 15, wiping 10 is fixed on the travel(l)ing rest 8 of piston rod 13 upper ends of cylinder 14, and be fixed with guide post 11 on the travel(l)ing rest 8, an end of guide post 11 activities stretches in the fairlead 12 on the support 15.
The two ends of corresponding roll shaft active section 1 are provided with limit induction device 21 on the support bar 7, limit induction device 21 links to each other with travel switch 22 by signal transmission line road 23, travel switch 22 links to each other with motor 18 by control circuit 24, when nut 9 bottoms when support bar 7 moves to limit induction device 21 position, limit induction device 21 sends signal to travel switch 22,18 counter-rotatings of travel switch 22 control motors, thus realize the automatic reverse of wiping 10.
Fig. 2 is the left view of Fig. 1, and Fig. 4 is the local enlarged diagram of Fig. 2.Support bar 7 is fixed under the wire rod thread section 3, and nut 9 is processed with a groove 19 with the outer wall that support bar 7 joins, and groove 19 two sides are provided with wear block 20, and the outer surface of support bar 7 contacts with friction block 20, and and bottom land between leave the gap.
When using the roll mark spot wiper that this is used for rolling mill, at first, injection pressure gas in the rodless cavity of piston makes wiping 10 move to roll shaft active section 1, adjusts the closeness of contact of wiping 10 and roll shaft active section 1 and keeps this invariant position; Then, start travel switch 22, drive screw mandrel 2 rotations after when motor 18 energisings, by reduction box 17 decelerations, this moment, the nut 9 on the screw mandrel 2 drove supports 15 together along the axis moving linearly of screw mandrel 2, the piston rod 13 of support 15 upper cylinders 14 is vertical with the axis of roll shaft active section 1, the wiping of adjusted good position 10 is at moving linearly on the roll shaft active section 1 in rotation just under the effect of screw pair on the piston rod 13, and then reaches the purpose of wiping clearly roll shaft active section 1.
Claims (5)
1. roll mark spot wiper that is used for rolling mill, it is characterized in that: described wiper comprises the sliding spiral pair that is driven by motor (18), sliding spiral pair comprises the screw mandrel (2) that be arranged in parallel with roll shaft active section (1), screw mandrel (2) is provided with the thread segment (3) relative with roll shaft active section (1), and the length of wire rod thread section (3) is more than or equal to the length of roll shaft active section (1), wire rod thread section (3) is provided with the nut (9) that matches with it, nut (9) is fixed with cylinder (14) towards a side of roll shaft active section (1), piston in the cylinder (14) is provided with piston rod (13) and stretches out outside the cylinder (14), the end that piston rod (13) stretches out is provided with wiping head (10), and the wiping head (10) on the operating position contacts with the outer surface of roll shaft active section (1);
Described screw mandrel (2) one sides are provided with support bar (7), support bar (7) lays respectively at screw mandrel (2) both sides with roll shaft active section (1), three's axis is in same plane and parallel to each other, support bar (7) active section is relative with wire rod thread section (3), and the length of support bar (7) active section is more than or equal to the length of wire rod thread section (3), and support bar (7) contacts with nut (9) or has the gap;
Offer axial pass trough (19) on the described nut (9), groove (19) sidewall and/or bottom are provided with friction block (20), and part or all of support bar (7) is positioned at groove (19), and support bar (7) only contacts with friction block (20);
Described piston rod (13) is straight-bar, and piston rod (13) is mutually vertical with the axis of roll shaft active section (1), and wire rod thread section (3) and support bar (7) active section are all over against roll shaft active section (1);
Described cylinder (14) is fixedly connected with nut (9) by support (15), the end that piston rod (13) stretches out cylinder (14) is provided with travel(l)ing rest (8) and is connected with wiping head (10), guide post (11) one ends parallel with piston rod (13) are fixed on the travel(l)ing rest (8), and other end activity is stretched in the fairlead (12) on the support (15);
Described wiping head (10) bottom transverse cross section is swallow-tail form, and travel(l)ing rest (8) is provided with dovetail groove with matching.
2. the roll mark spot wiper for rolling mill according to claim 1, it is characterized in that: described gap is 0.5mm～0.7mm.
3. the roll mark spot wiper for rolling mill according to claim 1, it is characterized in that: the position at upper corresponding roll shaft active section (1) two ends of described support bar (7) is provided with limit induction device (21), limit induction device (21) links to each other with travel switch (22) by signal transmission line road (23), and travel switch (22) links to each other with motor (18) by control circuit (24).
4. the roll mark spot wiper for rolling mill according to claim 1 is characterized in that: the output shaft of described motor (18) links together with screw mandrel (2) by decelerator (17), shaft coupling (16).
5. the roll mark spot wiper for rolling mill according to claim 1, it is characterized in that: the screw thread on the described wire rod thread section (3) is the single head trapezoidal thread, and angle of thread is 30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910194756 CN102000699B (en) | 2009-08-28 | 2009-08-28 | Roll mark spot wiper for rolling mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910194756 CN102000699B (en) | 2009-08-28 | 2009-08-28 | Roll mark spot wiper for rolling mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102000699A CN102000699A (en) | 2011-04-06 |
| CN102000699B true CN102000699B (en) | 2013-01-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910194756 Expired - Fee Related CN102000699B (en) | 2009-08-28 | 2009-08-28 | Roll mark spot wiper for rolling mill |
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| Country | Link |
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| CN (1) | CN102000699B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102658269A (en) * | 2012-04-27 | 2012-09-12 | 宝钢发展有限公司 | Handheld roller wiping tool |
| CN103894420B (en) * | 2012-12-28 | 2017-05-03 | 上海宝钢工业技术服务有限公司 | Online roll surface cleaning and polishing device capable of being quickly disassembled |
| CN108311427B (en) * | 2018-01-29 | 2023-09-19 | 东佑达机器人（苏州）有限公司 | Rotary wiping machine for screw rod |
| CN109502957A (en) * | 2018-10-31 | 2019-03-22 | 彩虹集团（邵阳）特种玻璃有限公司 | Roller boss processing unit and method in a kind of production of cover-plate glass |
| CN113432905A (en) * | 2021-06-23 | 2021-09-24 | 中国核动力研究设计院 | Nuclear waste bucket surface wiping sampling device and shielding transfer chamber |
| CN118437768B (en) * | 2024-07-05 | 2024-09-03 | 溧阳市兴达机械有限公司 | Metal roller surface cleaning and maintaining device and application method thereof |
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| JPS5910406A (en) | 1982-07-08 | 1984-01-19 | Nippon Steel Corp | Roll grinding device in rolling mill stand |
| JPS59156508A (en) | 1983-02-24 | 1984-09-05 | Mitsubishi Heavy Ind Ltd | Inline grinding method of roll of rolling mill |
| JPH04148819A (en) | 1990-10-12 | 1992-05-21 | Sumitomo Metal Ind Ltd | Roll profile measurement method and device |
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| CN2834720Y (en) * | 2005-09-30 | 2006-11-08 | 邢台纳科诺尔极片轧制设备有限公司 | Casting roller on-line polishing device for battery pole plate casting machine |
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| CN200998732Y (en) * | 2007-01-25 | 2008-01-02 | 上海宝钢工程技术有限公司 | Modified roller on-line wiping cleaning device |
| CN201505668U (en) * | 2009-08-28 | 2010-06-16 | 宝钢发展有限公司 | Roll mark blur wiper for a rolling mill |
-
2009
- 2009-08-28 CN CN 200910194756 patent/CN102000699B/en not_active Expired - Fee Related
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5910406A (en) | 1982-07-08 | 1984-01-19 | Nippon Steel Corp | Roll grinding device in rolling mill stand |
| JPS59156508A (en) | 1983-02-24 | 1984-09-05 | Mitsubishi Heavy Ind Ltd | Inline grinding method of roll of rolling mill |
| JPH04148819A (en) | 1990-10-12 | 1992-05-21 | Sumitomo Metal Ind Ltd | Roll profile measurement method and device |
| JPH04148818A (en) | 1990-10-12 | 1992-05-21 | Sumitomo Metal Ind Ltd | Roll wear measurement method and device |
| CN2235329Y (en) * | 1995-07-17 | 1996-09-18 | 华东冶金学院 | On line reparing and milling device for roll of cold belt rolling machine |
| CN1355084A (en) * | 2000-11-30 | 2002-06-26 | 钱远强 | On-site grinding polisher |
| CN2834720Y (en) * | 2005-09-30 | 2006-11-08 | 邢台纳科诺尔极片轧制设备有限公司 | Casting roller on-line polishing device for battery pole plate casting machine |
| CN2920468Y (en) * | 2006-05-16 | 2007-07-11 | 上海精裕设备成套工程有限公司 | Pinch roller on line automatic finishing device of reeling machine |
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| CN200988048Y (en) * | 2006-12-19 | 2007-12-12 | 比亚迪股份有限公司 | Roller cleaning mechanism |
| CN200998732Y (en) * | 2007-01-25 | 2008-01-02 | 上海宝钢工程技术有限公司 | Modified roller on-line wiping cleaning device |
| CN201505668U (en) * | 2009-08-28 | 2010-06-16 | 宝钢发展有限公司 | Roll mark blur wiper for a rolling mill |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102000699A (en) | 2011-04-06 |
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