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21. 发明专利

JPH11267536A METHOD FOR RECONDITIONING MILLING PART OF ROLLER MILL 失效
公开(公告)号：JPH11267536A
公开(公告)日：1999-10-05
申请号：JP7771698
申请日：1998-03-25
申请人： BABCOCK HITACHI KK
发明人： SATO KAZUNORI , MEGURI NOBUYASU , KANEMOTO HIROAKI , MURAKAMI EIJI , MITSUI HIDEO , SAKODA KOTARO
IPC分类号： B02C15/04 , B02C15/00 , B23K9/04
摘要： PROBLEM TO BE SOLVED: To significantly shorten the time taken to repair a milling part of a roller mill, to lower the cost for maintenance, and to keep the safety of operation. SOLUTION: In this roller mill for milling a raw material between a milling roller 4 and a milling lathe 5 of a rotary table 3 by applying a milling load to the milling roller 4 by hydraulic force of a hydraulic cylinder, in the case the milling part is worn up and deformed, inverse hydraulic force is applied to the hydraulic cylinder to lift up the milling roller 4 to part the milling roller 4 from the milling lathe 5 and in such a state, Hardening and cladding treatment is carried out on the milling faces of the milling roller 4 and the milling lathe 5. At that time, regarding the milling lathe 5, hardening and padding treatment is carried out while rotating the rotary table 3 at a low rotation speed and inserting a torch 24 through a door opened in a housing 8. On the other hand, regarding the milling roller 4, hardening and padding treatment is carried out while temporarily installing a low speed rotating and driving apparatus 26 on the stopped rotary table 3, rotating the milling roller 4 at a low rotation speed by the low speed rotating and driving apparatus 26, and inserting a torch 24 through a door for maintenance or a door for torch insertion opened in the housing 8.

22. 发明专利

JPH11147047A METHOD AND APPARATUS FOR CONTROLLING ROLLER MILL 失效
公开(公告)号：JPH11147047A
公开(公告)日：1999-06-02
申请号：JP31543497
申请日：1997-11-17
申请人： BABCOCK HITACHI KK
发明人： SATOU KAZUNORI , MEGURI NOBUYASU , SHOJI KAZUNORI , NISHIDA HIDEKAZU , HASEGAWA TADASHI , TATSUMA TERUAKI , KANEMOTO HIROAKI , TANIMOTO KAZUNORI
IPC分类号： B02C15/04 , B02C25/00
摘要： PROBLEM TO BE SOLVED: To avoid self-exitated vibration by a method in which in an apparatus for crushing a raw material by crushing rollers, the supply of the raw material, after being made excess temporarily at the start of the supply, is reduced, and a crushing load is set up low at the start of the supply of the raw material, and the crushing load is increased with the passage of time. SOLUTION: A crushing raw material 5 supplied from a raw material supply pipe 4 to the center of a rotary table 2 is moved to the periphery of the table 2 by centrifugal force to be crushed between a crushing lace 6 and a crushing roller 3. A crushed powder and granular material are dried while being lifted in a housing 1 by hot air 7 from an air throat. In order to avoid self-excited vibration generated with the actuation and stop of a roller mill, a quantitative overshoot is implemented temporarily simultaneously with the start of the supply of the crushed raw material 5. Next, the supply of the raw material, after being reduced close to a lower limit, is elevated again. The crushing load is set up low at the start of the supply of the crushed raw material 5 and increased again corresponding to the amount of the supplied raw material.

23. 发明专利

JPH09239284A ROLLER MILL 失效
公开(公告)号：JPH09239284A
公开(公告)日：1997-09-16
申请号：JP5321496
申请日：1996-03-11
申请人： BABCOCK HITACHI KK
发明人： SATOU KAZUNORI , KANEMOTO HIROAKI , MEGURI NOBUYASU , SHOJI KAZUNORI , MITSUI HIDEO
IPC分类号： B02C15/04 , B02C25/00
摘要： PROBLEM TO BE SOLVED: To control the generation of a self-oscillation in spite of the long-term use by providing a pivot in such a way that it is transferable to the fine powder discharging side of crushing rollers in a device designed for finly crushing a feedstock by the interlocked operation of the crushing rollers and a rotary table of a nearly disc shape. SOLUTION: This roller mill is equipped with a rotary table of an almost disc shape and plural tire-shaped crushing rollers 1. In addition, roller pivots 3 which work as fulcrums for the pendulum action of the crushing rollers 1, are provided on the top of a roller bracket 2 installed on the crushing rollers 1. In this case, to make it possible to support the crushing rollers 1 substantially in a toe-in state by moving the positions of the roller pivots 3 to the fine powder producing side, the roller pivots 3, held from the right/left using plural pivot spacers 21 of a semidisc shape, are mounted in an upper and a lower pivot blocks 4a, 4b. Thus, the positions of the roller pivots 3 are changed by selecting the number of pivot spacers 21.

24. 发明专利

JPH09206614A CONTROL METHOD OF PRESSING FORCE OF ROLLER MILL 失效
公开(公告)号：JPH09206614A
公开(公告)日：1997-08-12
申请号：JP2132496
申请日：1996-02-07
申请人： BABCOCK HITACHI KK
发明人： MITSUI HIDEO , HASEGAWA TADASHI , SATOU KAZUNORI , KANEMOTO HIROAKI , MEGURI NOBUYASU
IPC分类号： B02C15/04 , B02C25/00
摘要： PROBLEM TO BE SOLVED: To prevent the generation of self-exciting vibration without discharging matter to be ground as coarse particles. SOLUTION: In the case of a coal grinding roller mill, when coal supply stopping operation is performed at time t1 from a low load region, the supply quantity of coal lowers as shown by (a) of a drawing and the pressing force acting on a grinding roller is also reduced as shown by (b) of the drawing. The supply quantity of coal becomes lowest at time t2 and, when a coal supply stopping command is outputted at time t3, the roller mill increases the pressing force of the grinding roller as shown by (c) of the drawing within the residual coat treatment region up to a stop time of time t4. By this constitution, coal in the roller mill can be rapidly finely ground to be rapidly discharged out of the roller mill and can be rapidly passed, through the residual coal treatment region having the possibility of the generation of self-exciting vibration and the generation of self-exciting vibration can be suppressed. Further, since coal is finely ground to the end, coarse particles are not discharged.

25. 发明专利

JPH08238435A METHOD AND APPARATUS FOR ROLLER SYSTEM GRINDING 失效
公开(公告)号：JPH08238435A
公开(公告)日：1996-09-17
申请号：JP4325795
申请日：1995-03-02
申请人： BABCOCK HITACHI KK
发明人： MURAKAMI EIJI , NISHIDA HIDEKAZU , SATOU KAZUNORI , KANEMOTO HIROAKI
IPC分类号： B02C15/04 , B02C25/00
摘要： PURPOSE: To effectively reduce self-exciting vibration which occurs in grinding by calculating the characteristic frequency and the rate of change of the frequency of a grinding part and controlling the resistance value of a flow resistance giving means for a pressurized medium by using the results of calculation. CONSTITUTION: In a roller type grinder, a material 18 to be ground is ground by pressing a grinding roller 2 placed on a grinding ring 1 by a hydraulic device equipped with a flow resistance giving means. A roller bracket 3 is fitted with a sensor 25, its output is input into a controller 28, and the opening of a flow rate control valve 23 is controlled to change the flow resistance of a hydraulic medium 26. In other words, characteristic frequency is obtained from a wave form measured by the sensor 25 by a characteristic frequency analyzer 29, and the rate of change of the characteristic frequency for the change of flow resistance is calculated from the characteristic frequency by a characteristic frequency change rate calculator 30. The amount of the change of opening of the flow rate control valve 23 is calculated from the rate of change of the characteristic frequency by a valve opening calculator 31 to control the opening of the valve 23 through a valve opening controller 32.

26. 发明专利

JPH08155317A ROLLER MILL 失效
公开(公告)号：JPH08155317A
公开(公告)日：1996-06-18
申请号：JP29962794
申请日：1994-12-02
申请人： BABCOCK HITACHI KK
发明人： SATOU KAZUNORI , MEGURI NOBUYASU , SHOJI KAZUNORI , KANEMOTO HIROAKI , YUASA HIROSHI
IPC分类号： B02C15/04
摘要： PURPOSE: To prevent self-exciting vibration of a roller mill by constituting at least one of a pulverizing roller and a pulverizing ring of plural segments, and differentiating pressing contact lines from each other every segment. CONSTITUTION: Pulverizing rollers 4 are rolled on a compressed powder bed on a pulverizing race 17 of a pulverizing ring 5. In this case, the pulverizing roller 4 is constituted of plural segments 21a, and in any segment 21a, a pressing contact line 20a is inclined against a conventional pressing contact line. And the inclined angles of pressing contact lines 20a are differentiated from each other every roller segment 21a. A pressing contact start point and a pressing contact finish point shown as both the ends of the pressing contact line 20a do not coincide with each other. Therefore, by mutual cancel action of plural pulverizing rollers, the generation of severe self-exciting vibration in which a roller mill is synchronously moved is damped to restrain it to a level of faint forced vibration.

27. 发明专利

JPH0739773A ROLLER MILL 失效
公开(公告)号：JPH0739773A
公开(公告)日：1995-02-10
申请号：JP18824093
申请日：1993-07-29
申请人： BABCOCK HITACHI KK
发明人： SATOU KAZUNORI , HARADA TAKASHI , TANABE TAKETOSHI , KANEMOTO HIROAKI , HASEGAWA TADASHI
IPC分类号： B02C15/04
摘要： PURPOSE:To enable operation in wide area load or many kinds of coals without generating abnormal vibration by relaxing the track sudden change operation of a grinding roller by interposing a link support generating elastic deformation function accompanied by the operation of the grinding roller between a bracket and a pressure member. CONSTITUTION:A raw material is ground by a turntable 3 rotated around a vertical axis on a horizontal surface and having ring segments each having a grooved grinding surface arranged to the upper part thereof in a circumferential direction and a plurality of the grinding rollers rotated in the state pressing the peripheral surfaces thereof to the upper surface on the outer peripheral side of the turntable 3 and held to the upper parts of brackets 5 supporting rotary shafts by pressure members 6 through grinding load transmission members having pendulum like function. In this roller mill, link supports 9 generating elastic deformation function accompanied by the operation of the grinding rollers 4 are interposed between the brackets 5 and the pressure members 6. As a result, the track sudden change operation of the grinding rollers is relaxed and operation in wide area load or many kinds of coals is enabled without generating abnormal vibration.

28. 发明专利

JPH06277542A VERTICAL ROLLER MILL 失效
公开(公告)号：JPH06277542A
公开(公告)日：1994-10-04
申请号：JP7031993
申请日：1993-03-29
申请人： BABCOCK HITACHI KK
发明人： SATOU KAZUNORI , MEGURI NOBUYASU , SHOJI KAZUNORI , KANEMOTO HIROAKI , YUASA HIROSHI
IPC分类号： B02C15/04
摘要： PURPOSE:To prevent the generation of large self-excited vibration due to the synchronization of vibration of pulverizing rollers with each other in a vertical roller mill. CONSTITUTION:In a vertical roller mill where a turntable 3 which is rotatably supported in a housing 21 and which has a pulverizing surface 15 in the shape of a groove along the outer periphery of the upper surface, and plural pulverizing rollers 4 which are arranged on the pulverizing surface of the turntable in a state of pressurized contact with the turntable at prescribed intervals along the circumferential direction are provided, a weir body 13 is provided along the outer periphery of the turntable and the weir body is divided in the circumferential direction. The division cycle is made irregular in the circumferential direction or the height of the weir body 13 is changed along the circumferential direction. Consequently large self-excited vibration due to the synchronization of the pulverizing rollers is prevented to improve durability of the whole equipment.

29. 发明专利

JPH05337386A 失效
公开(公告)号：JPH05337386A
公开(公告)日：1993-12-21
申请号：JP14586092
申请日：1992-06-05
申请人： BABCOCK HITACHI KK
发明人： SATOU KAZUNORI , MEGURI NOBUYASU , SHOJI KAZUNORI , KANEMOTO HIROAKI , TAOKA YOSHINORI , HASEGAWA TADASHI
IPC分类号： B02C15/00 , B02C15/04
摘要： PURPOSE:To prevent that grinding rollers are synchronously subjected oscillation motion or up-and-down vibration motion by providing projections irregularly different in height to the outer periphery of a turntable and providing cavities changed in number or arrangement at every rollers to the outer peripheral surfaces of the rollers to mutually cancel the oscillation motions of the rollers. CONSTITUTION:In a roller mill having a turntable 3 rotating around a vertical shaft on a horizontal plane having a plurality of ring segments 14 provided thereto on the circumferential side thereof and a plurality of grinding rollers 4 rotated in the state pressed to the peripheral upper surfaces of the sigments 14 and finely grinding a solid raw material under pressure, a plurality of cavities 12 are provided to the circumferential parts on the side of a mill housing 18 of the grinding surfaces of the rollers 4 so as to be made different in number or in the arrangement on the circumferences of the rollers 4 at every rollers 4. Further, the projections 16 having shapes gently connected to the grinding races 15 provided to the upper surfaces of the segments 14 are provided to the outer peripheral parts of the ring segments 14 and arranged so that the shapes of the projections 16 are made different at every segments 14.

30. 发明专利

JPH05146696A VERTICAL ROLLER MILL AND GRINDING METHOD USING THE SAME 失效
公开(公告)号：JPH05146696A
公开(公告)日：1993-06-15
申请号：JP31106091
申请日：1991-11-26
申请人： BABCOCK HITACHI KK
发明人： SHOJI KAZUNORI , MEGURI NOBUYASU , SATOU KAZUNORI , HASEGAWA TADASHI , TAOKA YOSHINORI , KANEMOTO HIROAKI
IPC分类号： B02C15/00 , B02C15/04 , B02C25/00
摘要： PURPOSE:To stably operate a vertical roller mill even at a time of low load operation by operating holdup in the roller mill on the basis of pressure loss in the roller mill and regulating pressurization force of a grinding roll and/or rpm of a classifier so that the holdup does not reach a range being liable to induce vibration. CONSTITUTION:A vertical roller mill is constituted of a device 32 for detecting pressure loss in a roller mill, a device 704 for calculating the retention amount (holdup) of material to be ground in the roller mill on the basis of the detected value thereof, a device 500 for controlling pressurization force of a grinding roller and a device 600 for regulating rpm of a classifier so that the calculated holdup does not reach a range being liable to induce vibration. In such a way, since the holdup region generating dangerous vibration is avoided and operation is enabled, the roller mill is stably operated even when flow rate of coaling is low and it is operated at low load or coal largely different in property of coal (e.g. good in grindability) is ground.

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