CN103240148B - Vertical crusher - Google PatentsVertical crusher Download PDF
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- CN103240148B CN103240148B CN201210102101.0A CN201210102101A CN103240148B CN 103240148 B CN103240148 B CN 103240148B CN 201210102101 A CN201210102101 A CN 201210102101A CN 103240148 B CN103240148 B CN 103240148B
- Prior art keywords
- rotating grinding
- grinding board
- scraper plate
- Prior art date
- 238000000227 grinding Methods 0.000 claims abstract description 129
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
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The present invention relates to for the raw materials such as blast-furnace cinder, electric furnace slag and clinker are carried out with fine vertical powder Broken machine.
As the device pulverizing the raw material such as slag or grog, widely used vertical crusher (also referred to as Vertical Mill, vertical rolls Mill).Although vertical crusher efficiently can carry out Crushing of Ultrafine to raw material, because the characteristic of raw material or pulverization conditions etc. are various , there is the generation such problem of abnormal vibrations in reason.All the time, constantly seek for preventing the various of such abnormal vibrations Countermeasure.
As one of countermeasure it is known that vertical crusher disclosed in for example following patent documentation 1.This Verticle grinding Mechanism becomes, and the pulverization roller rotating freely and help roll is configured on rotating grinding board, the size ratio of the central diameter of help roll The size of the central diameter of pulverization roller is big.Thus, using help roll wide cut part by rotating grinding board containing large quantity of air Raw material layer (crushing layer) is engaging-in, and aerofluxuss lentamente compress on one side, thereby, it is possible to suppress abnormal vibrations thus efficiently to former Material carries out Crushing of Ultrafine.
Patent documentation 1：Japanese Unexamined Patent Publication 2010-234219 publication
Content of the invention
It is an object of the invention to, improve above-mentioned prior art further, a kind of vertical crusher, described vertical powder are provided Broken machine can regularly adjust raw material thickness, and can suppress abnormal vibrations thus efficiently carrying out Crushing of Ultrafine to raw material.
The vertical crusher of the present invention is characterised by, described vertical crusher includes：Cylindric chute, it is used for supplying To new raw material；Funnelform cone, it is configured at the outer circumferential side of described chute, for supplying inner loop raw material；Rotating grinding board, Its grinding roller scroll zones having middle section and being located at described its central area, new raw material is supplied to institute from described chute State middle section, and inner loop raw material is supplied to described middle section from described cone, and this rotating grinding board passes through Described each raw material is guided to described grinding roller scroll zones by rotation from described middle section；Pulverization roller and help roll, it is being pressed It is pressed in the state of described grinding roller scroll zones with the rotation of described rotating grinding board drivenly in described grinding roller scroll zones Roll；Blocking material ring, it is arranged on the periphery edge of described rotating grinding board, is used for blocking and has passed through described rotating grinding board and each roller Between described each raw material；And scraper plate, its be configured in the way of the inner side positioned at described grinding roller scroll zones described in The top in centre region, and so that the thickness of described each raw material to described grinding roller scroll zones for the guiding is fixed, the two of described scraper plate Individual end is mounted and fixed to the bottom of described cone via support shaft.
According to the vertical crusher of the present invention, due to scraper plate in the way of inside grinding roller scroll zones via support shaft It is mounted and is fixed on the bottom of the cone above middle section, therefore, it is possible to preventing raw material from piling up or being attached to rotation mill On disk, raw material thickness can be made to fix, further, it is possible to prevent from blocking chute such that it is able to efficiently guide raw material to pulverizing Roller and help roll.And, the frictional force acting on scraper plate and rotating grinding board being caused by raw material layer can be reduced such that it is able to drop Low or prevent in vertical crusher produce noise and vibration.And, even if it is also possible to utilize auxiliary in grinding roller scroll zones Roller is helped so that raw material thickness is fixed, therefore, it is possible to improve crush efficiency.
In an embodiment of the invention, described chute is towards rotating grinding board central authorities from the top of vertical crusher The chute being extends in the vertical direction.
And, in the case that the diameter of described rotating grinding board is set as D, from the lower surface of described chute to described rotation Go round and round a millstone disk upper surface be set to meet H1=D × (0.1～0.2) [mm] apart from H1.
And, in yet another embodiment of the present invention, in the situation that the diameter of described rotating grinding board is set as D Under, the height H2 of described scraper plate is set to meet H2=D × (0.015～0.02) [mm], by described rotating grinding board and institute State in the case that the height between scraper plate is set as h, from the upper surface of described rotating grinding board to the upper surface of described scraper plate away from It is set to H2+h [mm] from H3.
In another embodiment of the present invention, in terms of the unit projection area of described pulverization roller, apply to described pulverizing The load of roller is set to 9～12kg/cm2, in terms of the unit projection area of described help roll, apply to the load of described help roll Lotus is set to 2～5kg/cm2.
In another embodiment of the present invention, described blocking material ring is configured to carry out height adjustment.
In accordance with the invention it is possible to regularly adjust raw material thickness, and abnormal vibrations can be suppressed thus efficiently to former Material carries out Crushing of Ultrafine.
Fig. 1 is the integrally-built figure of the vertical crusher illustrating an embodiment of the invention.
Fig. 2 is the sectional view of a part for the vertical crusher shown in Fig. 1.
Fig. 3 is the enlarged drawing of a part for the vertical crusher shown in Fig. 1.
Fig. 4 is the figure illustrating the dependency relation between rotating grinding board speed and the coefficient of kinetic friction.
Fig. 5 is the figure illustrating the dependency relation between help roll contact pressure and virtual friction coefficient.
7：Rotating grinding board；
13：Grinding roller scroll zones；
41：T loss of weight portion；
47：Blocking material ring；
Below, referring to the drawings, the vertical crusher of embodiments of the present invention is described in detail.Fig. 1 is to illustrate The integrally-built figure of the vertical crusher of an embodiment of the invention, one part is represented by section.Fig. 2 is that this is vertical The sectional view of a part for pulverizer, Fig. 3 is the enlarged drawing of a part for this vertical crusher.As shown in FIG. 1 to 3, vertical Pulverizer 1 is configured to possess：Motor 3；Reductor 5, it is slowed down and is transmitted to the revolving force from described motor 3；Rotation Mill 7, it is configured at the top of described reductor 5, and is driven by motor 3 via reductor 5 and rotate；And housing 9, its Storage these structural elements in addition to motor 3.
And, a part for rotating grinding board 7 is illustrated with section in FIG, rotating grinding board 7 is by partly to cut in fig. 2 Face illustrates.Here, rotating grinding board 7 is configured to the circle around the middle section 11 possessing circle and described circular middle section 11 The grinding roller scroll zones 13 of ring-type.Elongated scraper plate 15 configures on middle section 11 along the diameter of rotating grinding board 7, described thin The length of long scraper plate 15 is diameter length and the length roughly the same with the diameter of cone 18 than chute described later (chute) 19 Degree.Two ends of scraper plate 15 are for example fixed on the bottom of cone 18 via support shaft 17.
And, vertical crusher 1 is configured to possess：Cylindric chute 19, it is configured at rotation to supply new raw material Go round and round a millstone disk 7 middle section 11 top, and vertically prolong towards rotating grinding board central authorities from the top of vertical crusher 1 Stretch；With funnelform cone 18, it is configured at the periphery of described chute 19, for supplying inner loop raw material.Described chute 19 It is each configured to constitute same plane with the bottom of cone 18.Therefore, new raw material and inner loop raw material are via these chutes 19 and cone 18 stably transmitted and supplied to the middle section 11 of rotating grinding board 7.Supply each to middle section 11 Raw material is guided to grinding roller scroll zones 13 by revolving force, but described each raw material is contacted with scraper plate 15 at this moment and is stirred and (stirred Mix) become fixing thickness.
And, there is reality as the aforementioned in the form of the chute 19 as the central authorities for supplying source materials to rotating grinding board 7 The chute 19 that mode of applying is extends in the vertical direction towards the central authorities of rotating grinding board 7 like that from the top of vertical crusher 1 is (so-called Be referred to as the form of center chute) and the side from vertical crusher 1 to inner side extension after towards rotating grinding board 7 central authorities Chute (the so-called form being referred to as side chute).
Here, in the aforesaid form being referred to as side chute, due to need not slip in the configuration of the top of vertical crusher 1 Groove, therefore, it is possible to reduce the size of the bearing of powder concentrator 35 etc., as a result, have the advantages that to be manufactured inexpensively device.
But, in order to form the chute in the central authorities towards rotating grinding board 7 from the side of vertical crusher 1, it usually needs Chute is made to bend in machine or tilt.
In this case, raw material slides in chute and moves, but due to raw material between coefficient of friction and Combining of coefficient of friction between raw material and sliding stand (chute), can produce and raw material cannot be made swimmingly to move to rotating grinding board 7 On problem.
In other words, be used side chute as the supply member of raw material in the case of it may occur that in chute flow Dynamic raw material is attached to the such problem of chute, particularly, has bending section or will be higher for tack former in chute To rotating grinding board 7, this problem is than more significant for material supply.
And, make chute bend in machine to change raw material flow direction after supply source materials to rotating grinding board Above or raw material is supplied to rotating grinding board under such circumstances from the chute tilting, due to the impact of the inertia force of raw material, The flow direction deflection of raw material can be led near trough outlet, as a result, raw material may be from trough outlet to the side of deflection To flying out and flowing, thus the problem in central authorities raw material cannot being supplied uniformly across to rotating grinding board 7 can be produced.
In this regard, present embodiment using by raw material from slipping that the top of vertical crusher 1 imports and is extends in the vertical direction Groove 19, makes raw material fall as the crow flies and supplied towards the central authorities of rotating grinding board 7, in the present embodiment, need not make raw material Slide in chute 19, without making chute 19 bend inside pulverizer, therefore, do not exist in the explanation of side chute form Described raw material is attached to problem as chute or raw material and flies out cocurrent from chute to the direction of the deflection rotating grinding board Dynamic such problem, is particularly preferred mode.
And, vertical crusher 1 possesses can be with rotating grinding board 7 in the grinding roller scroll zones 13 of rotating grinding board 7 Two pulverization rollers 21 rotating and rotating drivenly and two help rolls 22.Pulverization roller 21 is configured at grinding roller scroll zones 13 2 The position of decile, help roll 22 be configured between pulverization roller 21 by binary for grinding roller scroll zones 13 position.
Pulverization roller 21 links via the piston rod 29 of rocking arm 23,25 and hydraulic cylinder 27, and described rocking arm 23,25 is by means of axle quilt Rotatably it is installed on housing 9.Worked by making this hydraulic cylinder 27, by pulverization roller 21 press on grinding roller scroll zones 13 with Crush force is applied to raw material layer.And, help roll 22 is also supported to can swing freely in the same configuration.Pulverization roller 21 is main It is used for raw material is carried out Crushing of Ultrafine, help roll 22 is mainly used in being exhausted from raw material layer.
And, each raw material is on being supplied to middle section 11 and after being formed as fixing thickness using scraper plate 15, quilt Supply to grinding roller scroll zones 13, and pass through between rotating grinding board 7 and each roller 21,22 in this region 13, passed through rotating grinding board 7 The blocking material ring 47 that each raw material and each roller 21,22 between is arranged on the periphery edge of rotating grinding board 7 stops.This blocking material ring 47 Highly can be configured in the way of adjusting by it.
And, the annulus passage 31 as air blowing portion is defined by rotating grinding board 7 and housing 9.Bottom in housing 9 It is configured with airduct 33, described airduct 33 is used for providing gas tangentially to annulus passage 31 from outside.And, upper in housing 9 In portion, powder concentrator 35 is configured at the inner side of cone 18 around chute 19.Powder concentrator 35 is entered to the raw material after pulverizing using blade 37 Row classification.And, on the top of cone 18, the corresponding position of blade 37 of powder concentrator 35 is provided with fixing blade 37a.? The top of housing 9 is formed with product outlet 39, and described product outlet 39 is used for the raw material after pulverizing as product and gas one With discharge.
It is formed with the middle section 11 of rotating grinding board 7 and be for example used for mitigating the t loss of weight portion 41 of the weight of rotating grinding board 7.Subtract The plane in weight portion 41 is round shape, is embedded with liner plate 43 made of iron in the upper end of described t loss of weight portion 41.Install in the lower section of liner plate 43 There is the rib (not shown) for strengthening rotating grinding board 7.
In such vertical crusher 1 constituting, in the state of scraper plate 15 being installed on cone 18 via support shaft 17, It is formed with gap 59 between scraper plate 15 and rotating grinding board 7.The height h in this gap 59 becomes the thickness of raw material layer.This gap 59 Height h be set to such as 50mm.
And, in the case that the diameter of rotating grinding board 7 is set as D, from the lower surface of chute 19 (or cone 18) To rotating grinding board 7 upper surface be set to meet H1=D × (0.1～0.2) [mm] apart from H1.And, rotation is being ground In the case that the diameter of disk 7 is set as D, the height H2 of scraper plate 15 is set to meet H2=D × (0.015～0.02) [mm]. Therefore, from the upper surface of scraper plate 15 to the upper surface of rotating grinding board 7 apart from H3 be H3=H2+h [mm].And, due to Gap 59 together determines the thickness of raw material layer, and the height H4 of therefore blocking material ring 47 is variable.
So, during scraper plate 15 is mounted and fixed in the way of have left the amount of height h in gap 59 from middle section 11 The bottom of the cone 18 of centre region 11 top, therefore, scraper plate 15 is fixed to not contact with rotating grinding board 7 and not with this rotation The rotation of mill 7 and driven.Therefore, it is possible to effectively prevent raw material, on the middle section 11 of rotating grinding board 7, pile up like a mountain and former Material blocking chute 19, can make flowing and the raw material layer homogenization of raw material.
Vertical crusher 1 carries out action as following.First, by new raw material in the state of making rotating grinding board 7 rotate Supply to the middle section 11 of rotating grinding board 7 from chute 19.As new raw material it may be considered that mean particle dia is larger and moist Slag or grog etc..The new raw material supplying to middle section 11 is subject to towards mill radius due to the rotation of rotating grinding board 7 The centrifugal force in direction, thus slide to peripheral direction on rotating grinding board 7 move.Now, raw material is ground by rotation Disk 7 and be subject to the power of direction of rotation, this raw material slides between rotating grinding board 7, thus carry out than rotating grinding board 7 rotating speed slightly Slow rotation.
Thus, supply is acted on by the power that the radial direction of rotating grinding board 7 and the power of this both direction of direction of rotation synthesize To the raw material of middle section 11, therefore, raw material draws out spiral helicine track on rotating grinding board 7, while from central area Domain 11 is directed to grinding roller scroll zones 13.Now, rotating grinding board 7 across gap 59 the lower section of scraper plate 15 rotate, described between Gap 59 is arranged at rotating grinding board 7 and is between the scraper plate 15 in the state of rotation is obstructed, therefore so that supplying to central area The thickness of the raw material on domain 11 is fixed.
Fixed by making thickness, be prevented from stockpile mass in the middle region 11 such that it is able to for example improve maintainability. That is, in the operating of vertical crusher 1, the physics value of raw material is continually changing.Particularly, the granularity in impact material flow is divided In the case that cloth or moisture there occurs variation, supply and can be trapped on middle section 11 to the raw material of rotating grinding board 7, thus leading to Thickness changes.Thus, raw material changes with respect to the engaging-in rate of pulverization roller 21 or help roll 22, therefore vertical crusher 1 differential pressure becomes unstable it is necessary to adjust raw material quantity delivered, and its result is to lead to crush efficiency to reduce.
Therefore, by arranging scraper plate 15 the vertical crusher 1 as present embodiment, to make former on rotating grinding board 7 The bed of material becomes uniform so that thickness fixation is effective.And, in the case that the mobility of raw material is poor, work as Verticle grinding When machine 1 shuts down, raw material can be deposited on the middle section 11 of rotating grinding board 7 with maintaining the original state, and therefore can make maintainability Notable deterioration, but, such unfavorable condition can also be prevented using above-mentioned scraper plate 15.
Thickness is fixed and is guided on the middle section 11 from rotating grinding board 7 in the way of drawing helix and rolled to grinding roller The raw material in dynamic region 13 is blocked by blocking material ring 47.In grinding roller scroll zones 13, it is pressed against pulverization roller 21 He in this region 13 Help roll 22 rolls with the rotation of rotating grinding board 7 drivenly.Raw material is from the direction angled with the axis direction of roller Enter both pulverization roller 21 and help roll 22 and rotating grinding board 7 between, and by engaging-in and be exhausted and pulverize.
It is blown in housing 9 from annulus passage 31 from the gas such as the air of airduct 33 or hot blast.Cross after being pulverized Among the raw material dispersing and swimming in machine when the raw material of blocking material ring 47 or pulverizing or inner loop raw material, microgranule is straight Footpath is not that king-sized raw material is blown to top with the air-flow of gas.
The raw material having blowed to top rises in housing 9 with gas, and by the leaf of superposed powder concentrator 35 Piece 37 and be subject to grading, the raw material of prescribed particle size is together discharged from product outlet 39 with gas as product.Meanwhile, Thicker powder drops on rotating grinding board 7 and crushed again as inner loop raw material via cone 18.As product Prescribed particle size, such as average particle diameter (=Dp50) are of about 5～20 μm of granularity is preferred, more preferably 15 μm Following granularity.
Among the raw material having crossed blocking material ring 47, the king-sized raw material of mean particle dia or special containing metal etc. The raw material of weight falls to the lower section of vertical crusher 1 from annulus passage 31, and is taken out to from the bottom of vertical crusher 1 Outside.As needed, return again to chute 19 using the raw material that shipping line (not shown) makes taking-up, thus passing through outer loop Pulverized in vertical crusher 1.
In the present embodiment, pulverization roller 21 is formed as the diameter bigger than the diameter of help roll 22.Due to help roll 22 not It is the roller for pulverizing raw material, therefore, compared with pulverization roller 21, the plus-pressure that help roll 22 applies to rotating grinding board 7 is less i.e. Can.By the diameter of the central part of the thickness direction of roller be set as RD, the width dimensions of roller are set as W, will be used as along hanging down In the case that Nogata is set as F to the signature pressure of the power that roller presses on rotating grinding board 7, if the center by the width of roller Angle of inclination between line and vertical axises is set as θ, then each roller 21,22 presses on the roller surface pressure S of rotating grinding board 7 (Mpa) to be represented by S=(F × cos θ)/(W × RD).
Specifically, in terms of the unit projection area of pulverization roller 21, apply to the load of pulverization roller 21 (roller surface pressure S) For 9～12kg/cm2(0.882～1.176Mpa), in terms of the unit projection area of help roll 22, applies to the load of help roll 22 Lotus (roller surface pressure S) is 2～5kg/cm2(0.196～0.49Mpa).Set roller surface pressure S by such, can be with Good crush efficiency is pulverized.
As in order to attempt inherently suppressing the result of vibration and constantly wholwe-hearted research of milling, under the applicant has obtained The such understanding in face.First, analyze the essence of vibration of milling.Now, it is what is carried out to the starting point of vibration of milling Seek as a result, finding out that its reason is the sliding phenomenon of the moment of pulverization roller 21, and understand fully：With this sliding phenomenon for rise Point may proceed to produce diffusion vibration.But also understand：The occurrence cause of the sliding phenomenon of moment is due to coefficient of friction fall Low.
In vertical crusher 1, in the feelings of fine product below 15 μm for the average particle diameter to be obtained (=Dp50) Under condition, the specific surface area due to microgranule increases, and therefore there is the such medium of more gases in raw material layer, thus leading to rub Wipe coefficient to be gradually reduced, therefore, be more intended to obtain fine product, mill is more susceptible to vibrate.
And, as the experimental result of the applicant, obtain new opinion, this opinion has been overthrown on of science to friction system The final conclusion of number, i.e. following law (a)～(c)：A () coefficient of friction is determined by the material of rubs mutually and its surface roughness；(b) Coefficient of friction is proportional to vertical force, and unrelated with the size of contact area；And the size of (c) coefficient of friction and sliding speed Unrelated.I.e. it is known that：The final conclusion of above-mentioned (a)～(c) is suitable for a material and situation more than mm unit for its size, this There is significant environmental difference with the situation of the smashing portion of vertical crusher 1.
Therefore, the applicant is not only conceived to more than the mm of the new raw material of new input in the smashing portion of vertical crusher 1 Larger microgranule, be also conceived to following situations：If the granularity of required product is less, in pulverizer 1 interior circulation The mean particle dia of inner loop raw material is μm unit；It is not single microgranule with the inner loop raw material in pulverizer 1 interior circulation, and It is the Particle Swarm with gas mixing.
Based on such starting point, implement various experiments, result has obtained the dependency relation shown in Fig. 4.Fig. 4 is to illustrate The figure of the dependency relation between the rotating grinding board speed of vertical crusher 1 and the coefficient of kinetic friction, is shown in the longitudinal axis with percentage ratio respectively Go out the coefficient of kinetic friction, in transverse axis, rotating speed is shown.According to this figure it can be clearly seen that there are following trend：If mean particle dia becomes Little, then coefficient of friction can significantly reduce.
Find：This trend can produce subtle difference according to species of vertical crusher 1 raw material to be dealt with etc., but Generally without change.Therefore, the coefficient of friction in the state of the media such as gas being mixed with raw material is referred to as and " apparent rubs Wipe coefficient ".And, as shown in figure 4, as the result of experiment, find：Virtual friction coefficient has overthrown the friction system of above-mentioned (c) The number final conclusion unrelated with the size of sliding speed.That is, as shown in Figure 4 it is believed that when speed increases, virtual friction coefficient Significantly reduce.
In vertical crusher 1, due to there is the such medium of gas in raw material layer, accordingly, it can be said that being difficult to vertical Above-mentioned final conclusion (a)～(c) is applied entirely without the presence depending on the such medium of gas in the environment of the smashing portion of formula pulverizer 1. It follows that for the vibration of milling suppressing vertical crusher 1, regularly keeping or increase virtual friction coefficient be especially heavy Will.
It is additionally, since and contains the such medium of gas in raw material layer, thus, it can be known that the scavenging action of raw material layer is very heavy Will, how to remove gas is maximum problem.And find：As the final conclusion of above-mentioned (b), known coefficient of friction and vertical force Proportional, but this is applied to the raw material of more than mm unit-sized, if the ring of the smashing portion of vertical crusher to be applied to 1 Under border, then less suitable.
This is because, in vertical crusher 1, the microgranule of raw material together with gas mixing, therefore, even if will pulverizing and breaking Bad microgranule, microgranule also can be driven away from the underface of pulverization roller 21 by this gas.Therefore, do not produce impact to pulverizing completely.Therefore, Need the underface making the microgranule of the raw material mixing with media such as gases stay pulverization roller 21, vertical in present embodiment In formula pulverizer 1, blocking material ring 47 is responsible for such effect.
That is, due to preventing the raw material layer of grinding roller scroll zones 13 to overflow from rotating grinding board 7 using this blocking material ring 47, therefore Virtual friction coefficient can effectively be increased.It is additionally, since and make help roll 22 carry out action with roller surface pressure as described above, Therefore, it is possible to significantly increase virtual friction coefficient further.
And find, if as shown in figure 5, making the roller surface hypertonia of help roll 22, virtual friction system can be made on the contrary Number reduces, thus easily producing vibration of milling.Fig. 5 is that the contact pressure of help roll 22 illustrating vertical crusher 1 is rubbed with apparent Wipe the figure of the dependency relation between coefficient, respectively virtual friction coefficient is illustrated in the longitudinal axis with percentage ratio, in transverse axis, contact pressure is shown Power.
When making roller surface hypertonia, it is susceptible to vibration of milling, this is significantly to see in conventional vertical crusher The trend observing, this becomes and makes pulverizing load act on the situation identical shape of all of pulverization roller in multiple pulverization rollers 21 Condition, therefore, its result is to induce vibration of milling.Thus, in the vertical crusher 1 of present embodiment, in order to effectively suppress Mill vibration to improve crush efficiency, employs following such structures.
That is, as described above, employing pulverization roller 21 and help roll 22 in groups.Thereby, it is possible to using roller surface pressure Less help roll 22 is carried out using the larger pulverization roller of roller surface pressure 21 after the raw material layer on rotating grinding board 7 is exhausted Pulverize, therefore, it is possible to improve the compression effect of the raw material layer in grinding roller scroll zones 13, thus improving crush efficiency.
And, for help roll 22, also there is the deadweight merely with help roll 22 and be pressed against on rotating grinding board 7 Method, in this case, even if cantilever or the weaker part of roll shaft equal strength also can use, therefore existing can be at a low price The such advantage of manufacture device.
But, sufficient surface pressing cannot be obtained merely with help roll 22 and lead to aerofluxuss insufficient due to also existing Situation, therefore, in aforesaid present embodiment, as preferred mode, describing has the preferred surface pressing to help roll 22 Scope.
And, the lower end of chute 19 and cone 18 is configured near rotating grinding board 7, scraper plate 15 is mounted on cone Body 18, and set the distance of each configuration relation and the parameter of size as described above.It is deposited in rotation thereby, it is possible to eliminate Stockpile on the middle section 11 of mill 7, so that the thickness of raw material layer is uniformly, and, can also prevent from blocking chute 19. Therefore, it is possible to improve crush efficiency.And, by using such chute 19, cone 18 and scraper plate 15, carrying further The exhaust effect of high help roll 22, therefore, it is possible to suppress vibration to improve crush efficiency further.
And, the periphery edge of rotating grinding board 7 is equipped with carry out the blocking material ring 47 of height adjustment.Rotating grinding board The thickness of the raw material layer on 7 is also affected by the height of blocking material ring 47, therefore, by making the height of this blocking material ring 47 according to chute 19 Or the changeable parameters of scraper plate 15 etc., crush efficiency can be improved further.
And, the arrangement angles of scraper plate 15 are the angle for example being specified by following two straight lines：Described two straight lines are even Obtained by between the peering central point of two pulverization rollers 21 put, the straight line of the length direction of straight line and scraper plate 15, scrapes in fig. 2 The arrangement angles of plate 15 are set to about 45 °, but can be set as various angles.And, pulverization roller 21 and 22 points of help roll Not with two for one group, and it is each configured with one group but it is also possible to more configure many according to the ability of vertical crusher 1 Group.
Particularly, in the case of the vertical crusher 1 designing larger disposal ability, the overall overall dimensions meeting of device Become big with the increase for the treatment of capacity, but, maximize if over it and make the size-enlargement of pulverization roller 21, then raw material is nibbled The speed entering can be significantly increased, as a result, as shown in figure 4, virtual friction coefficient diminishes, pulverization roller 21 becomes easy slip Situation.
By the present invention in that being pulverized after raw material layer compression aerofluxuss with help roll 22, virtual friction system can be increased Number, in case sliding stop is such that it is able to improve disposal ability, is preferred therefore in terms of the maximization of vertical crusher 1.
Priority Applications (2)
|Application Number||Priority Date||Filing Date||Title|
|JP2012028821A JP5906782B2 (en)||2012-02-13||2012-02-13||Vertical crusher|
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|CN103240148A CN103240148A (en)||2013-08-14|
|CN103240148B true CN103240148B (en)||2017-03-01|
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|CN201210102101.0A CN103240148B (en)||2012-02-13||2012-04-09||Vertical crusher|
|CN 201220146883 CN202621230U (en)||2012-02-13||2012-04-09||Vertical grinder|
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|CN 201220146883 CN202621230U (en)||2012-02-13||2012-04-09||Vertical grinder|
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|JP (1)||JP5906782B2 (en)|
|CN (2)||CN103240148B (en)|
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