CN103240148A - Vertical grinder - Google Patents

Vertical grinder Download PDF

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Publication number
CN103240148A
CN103240148A CN2012101021010A CN201210102101A CN103240148A CN 103240148 A CN103240148 A CN 103240148A CN 2012101021010 A CN2012101021010 A CN 2012101021010A CN 201210102101 A CN201210102101 A CN 201210102101A CN 103240148 A CN103240148 A CN 103240148A
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CN
China
Prior art keywords
raw
rotating grinding
chute
grinding board
vertical crusher
Prior art date
Application number
CN2012101021010A
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Chinese (zh)
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CN103240148B (en
Inventor
池田充
繁本康弘
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宇部兴产机械株式会社
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Priority to JP2012-028821 priority Critical
Priority to JP2012028821A priority patent/JP5906782B2/en
Application filed by 宇部兴产机械株式会社 filed Critical 宇部兴产机械株式会社
Publication of CN103240148A publication Critical patent/CN103240148A/en
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Publication of CN103240148B publication Critical patent/CN103240148B/en

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Abstract

The invention provides a vertical grinder capable of regularly regulating the layer thickness of a raw material and inhibiting abnormal vibration so as to efficiently micro-grind the raw material. The vertical grinder (1) comprises a rotating millstone (7), a chute (19), a taper body (18) and a scraper (15), wherein the rotating millstone (7) is provided with a central region (11) for holding supplied raw material and a grinding roller rolling region (13) for the rolling of a grinding roller (21) and an auxiliary roller (22); the chute (19) is used for supplying the new raw material to the central region; the taper body (18) is used for supplying the internally circulated raw material to the central region; and the scraper (15) is installed and fixed at the lower end part of the taper body through a support shaft (17) and used for stirring the raw material on the central region. The layer thickness of the raw material on the rotating millstone is fixed into the height of a gap (59) between the scraper and the rotating millstone and is regulated by using the height of a material retaining ring (47). In the grinding roller rolling region, the raw material layer is exhausted by the auxiliary roller and then micro-ground by the grinding roller.

Description

Vertical crusher

Technical field

The present invention relates to for raw materials such as blast-furnace cinder, electric furnace slag and clinker are carried out fine vertical crusher.

Background technology

Device as pulverizing raw materials such as slag or grog extensively adopts vertical crusher (being also referred to as Vertical Mill, vertical roller grinder).That raw material is carried out micro mist is broken though vertical crusher can be efficiently, because there is the such problem of abnormal vibrations that takes place in a variety of causes such as Material Characteristics or pulverization conditions.All the time, constantly seek be used to the various countermeasures that prevent such abnormal vibrations.

As one of them countermeasure, known for example following patent documentation 1 disclosed vertical crusher.This vertical crusher constitutes, and rotation pulverization roller and help roll freely is configured on the rotating grinding board, and the size of the central diameter of help roll is bigger than the size of the central diameter of pulverization roller.Thus, utilize the wide cut part of help roll that the raw material layer (crushing layer) that contains a large amount of air on the rotating grinding board is engaging-in, on one side exhaust compress lentamente on one side, thus, efficiently raw material to be carried out micro mist broken thereby can suppress abnormal vibrations.

Patent documentation 1: TOHKEMY 2010-234219 communique

Summary of the invention

The objective of the invention is to, further improve above-mentioned prior art, a kind of vertical crusher is provided, described vertical crusher can be adjusted the raw material bed thickness regularly, thereby and can suppress abnormal vibrations efficiently raw material to be carried out micro mist broken.

Vertical crusher of the present invention is characterised in that described vertical crusher comprises: chute cylindraceous, and it is used for supplying with new raw material; Funnelform cone, it is disposed at the outer circumferential side of described chute, is used for supplying with the inner loop raw material; Rotating grinding board, the grinding roller scroll zones that it has middle section and is positioned at described its central area, new raw material is supplied to described middle section from described chute, and the inner loop raw material is supplied to described middle section from described cone, and this rotating grinding board guides to described grinding roller scroll zones with described each raw material from described middle section by rotation; Pulverization roller and help roll, it rolls in described grinding roller scroll zones being pressed under the state of described grinding roller scroll zones along with the rotation of described rotating grinding board drivenly; Blocking material ring, it is arranged in the outer peripheral edges portion of described rotating grinding board, is used for blocking described each raw material that has passed through between described rotating grinding board and each roller; And scraper plate, its mode with the inboard that is positioned at described grinding roller scroll zones is configured in the top of described middle section, and guiding is fixed to the bed thickness of described each raw material of described grinding roller scroll zones, and the bottom of described cone is installed and is fixed in two ends of described scraper plate via bolster.

According to vertical crusher of the present invention, because scraper plate is mounted and is fixed in the bottom of the cone of middle section top via bolster in the mode that is positioned at grinding roller scroll zones inboard, therefore, can prevent that raw material from piling up or be attached on the rotating grinding board, the raw material bed thickness is fixed, and, can prevent from stopping up chute, thereby can efficiently raw material be guided to pulverization roller and help roll.And, can reduce the frictional force that acts on scraper plate and rotating grinding board that caused by raw material layer, thus noise and the vibration that can reduce or prevent from vertical crusher, producing.And, even on the grinding roller scroll zones, also can utilize help roll that the raw material bed thickness is fixed, therefore, can improve crush efficiency.

In an embodiment of the invention, described chute is the chute that vertically extends towards rotating grinding board central authorities from the top of vertical crusher.

And, be set at the diameter with described rotating grinding board under the situation of D, be set to the distance H 1 of the upper surface of described rotating grinding board from the lower surface of described chute and satisfy H1=D * (0.1~0.2) [mm].

And, in yet another embodiment of the present invention, be set at the diameter with described rotating grinding board under the situation of D, the height H 2 of described scraper plate is set to and satisfies H2=D * (0.015~0.02) [mm], be under the situation of h with the height setting between described rotating grinding board and the described scraper plate, the distance H 3 of the upper surface from the upper surface of described rotating grinding board to described scraper plate is set to H2+h[mm].

In another embodiment of the present invention, in the unit projected area of described pulverization roller, the load that is applied to described pulverization roller is set to 9~12kg/cm 2, in the unit projected area of described help roll, the load that is applied to described help roll is set to 2~5kg/cm 2

In another embodiment of the present invention, described blocking material ring constitutes and can carry out Height Adjustment.

According to the present invention, can adjust the raw material bed thickness regularly, thereby and can suppress abnormal vibrations efficiently raw material to be carried out micro mist broken.

Description of drawings

Fig. 1 is the integrally-built figure that the vertical crusher of an embodiment of the invention is shown.

Fig. 2 is the cutaway view of the part of vertical crusher shown in Figure 1.

Fig. 3 is the enlarged drawing of the part of vertical crusher shown in Figure 1.

Fig. 4 is the figure that the dependency relation between rotating grinding board speed and the coefficient of kinetic friction is shown.

Fig. 5 is the figure that the dependency relation between help roll contact pressure and the virtual friction coefficient is shown.

Label declaration:

1: vertical crusher;

3: motor;

5: reductor;

7: rotating grinding board;

9: housing;

11: middle section;

13: the grinding roller scroll zones;

15: scraper plate;

17: bolster;

18: cone;

19: chute;

21: pulverization roller;

22: help roll;

23,25: rocking arm;

27: hydraulic cylinder;

29: piston rod;

31: the annulus passage;

33: airduct;

35: powder concentrator;

37: blade;

39: product outlet;

41: loss of weight portion;

43: liner plate;

47: blocking material ring;

59: the gap.

The specific embodiment

Below, with reference to accompanying drawing, the vertical crusher of embodiments of the present invention is at length described.Fig. 1 is the integrally-built figure that the vertical crusher of an embodiment of the invention is shown, and its part is represented by the cross section.Fig. 2 is the cutaway view of the part of this vertical crusher, and Fig. 3 is the enlarged drawing of the part of this vertical crusher.As Fig. 1~shown in Figure 3, vertical crusher 1 constitutes to be possessed: motor 3; Reductor 5, it slows down to the revolving force from described motor 3 and transmits; Rotating grinding board 7, it is disposed at the top of described reductor 5, and is driven by motor 3 and rotate via reductor 5; And housing 9, it takes in these structural elements except motor 3.

And the part of rotating grinding board 7 illustrates with the cross section in Fig. 1, and rotating grinding board 7 is illustrated with the cross section partly in Fig. 2.At this, rotating grinding board 7 constitutes the circular grinding roller scroll zones 13 around the middle section 11 that possesses circular middle section 11 and described circle.Elongated scraper plate 15 is configured on the middle section 11 along the diameter of rotating grinding board 7, and the length of described elongated scraper plate 15 is the long and length roughly the same with the diameter of cone 18 than the diameter of chute described later (chute) 19.Two ends of scraper plate 15 for example are fixed on the bottom of cone 18 via bolster 17.

And vertical crusher 1 constitutes to be possessed: chute 19 cylindraceous, and it is disposed at the top of the middle section 11 of rotating grinding board 7 in order to supply with new raw material, and vertically extends towards rotating grinding board central authorities from the top of vertical crusher 1; With funnelform cone 18, it is disposed at the periphery of described chute 19, is used for supplying with the inner loop raw material.The bottom of described chute 19 and cone 18 is configured to constitute same plane respectively.Therefore, new raw material and inner loop raw material are stably transmitted and are supplied on the middle section 11 of rotating grinding board 7 via these chutes 19 and cone 18.Be supplied to each raw material on the middle section 11 and be rotated power and guide to grinding roller scroll zones 13, being stirred (being stirred) but described each raw material contacts with scraper plate 15 at this moment becomes fixing bed thickness.

And, as the form of the chute 19 of the central authorities that are used for supplying source materials to rotating grinding board 7, there is chute 19 (the so-called form that is called as the center chute) that embodiment as the aforementioned vertically extends towards the central authorities of rotating grinding board 7 from the top of vertical crusher 1 like that and extends the back to the inside towards the chute (the so-called form that is called as the side chute) of the central authorities of rotating grinding board 7 from the side of vertical crusher 1.

At this, in the aforesaid form that is called as the side chute, owing to need not at the top of vertical crusher 1 configuration chute, therefore can reduce the size of the bearing etc. of powder concentrator 35, consequently, have the advantage of manufacturing installation at an easy rate.

, in order to form from the side of vertical crusher 1 chute towards the central authorities of rotating grinding board 7, need make chute crooked or tilt in machine usually.

Under these circumstances, move while raw material slides in chute, but because the coefficient of friction of stock yard and the combination of the coefficient of friction between raw material and the sliding stand (chute), can produce and to make raw material move to problem on the rotating grinding board 7 swimmingly.

In other words, using under the situation of side chute as the supply member of raw material, may occur in the raw material that flows in the chute and be attached to the such problem of chute, particularly, have bend or raw material supplying that will tack is higher in chute to the situation of rotating grinding board 7, this problem is more remarkable.

And, after making chute bending in machine change the flow direction of raw material, supply source materials on the rotating grinding board or with raw material and be supplied under the situation such on the rotating grinding board from the chute that tilts, because the The Effect of Inertia Force of raw material, near the flow direction deflection that the chute outlet, can cause raw material, consequently, raw material may the direction from chute outlet to deflection flies out and flows, thereby can produce the problem that raw material can't be supplied to equably the central authorities of rotating grinding board 7.

To this, present embodiment is utilized raw material from the top importing of vertical crusher 1 and the chute 19 that vertically extends, raw material is fallen as the crow flies towards the central authorities of rotating grinding board 7 to be supplied with, in the present embodiment, need not to make raw material in chute 19, to slide, also need not to make chute 19 in the pulverizer interior curve, therefore, not existing in the direction that the raw material described in the explanation of side chute form is attached to the such problem of chute or the raw material deflection on from chute to rotating grinding board and fly out and such problem that flows, is particularly preferred mode.

And vertical crusher 1 possesses two pulverization rollers 21 and two help rolls 22 that can rotate along with the rotation of rotating grinding board 7 drivenly on the grinding roller scroll zones 13 of rotating grinding board 7.Pulverization roller 21 is disposed at grinding roller scroll zones 13 binary positions, help roll 22 be disposed between the pulverization roller 21 with grinding roller scroll zones 13 binary positions.

Pulverization roller 21 via rocking arm 23,25 and the piston rod 29 of hydraulic cylinder 27 link, described rocking arm 23,25 is swung by means of axle is installed on housing 9 freely.By making this hydraulic cylinder 27 work, pulverization roller 21 is pressed on grinding roller scroll zones 13 so that raw material layer is applied crush force.And help roll 22 also is supported to and can swings freely with same structure.It is broken that pulverization roller 21 is mainly used in that raw material is carried out micro mist, and help roll 22 is mainly used in carrying out exhaust from raw material layer.

And, each raw material is on being supplied to middle section 11 and utilize scraper plate 15 to form after the fixing bed thickness, be supplied to grinding roller scroll zones 13, and between this zone 13 is by rotating grinding board 7 and each roller 21,22, has passed through the blocking material ring 47 that each raw material between rotating grinding board 7 and each roller 21,22 is arranged in the outer peripheral edges portion of rotating grinding board 7 and stopped.The mode that this blocking material ring 47 can be adjusted with its height is configured.

And, formed annulus passage 31 as air blowing portion by rotating grinding board 7 and housing 9.Dispose airduct 33 in the bottom of housing 9, described airduct 33 is for provide gas tangentially to annulus passage 31 from the outside.And in the top of housing 9, powder concentrator 35 is disposed at the inboard of cone 18 around chute 19.Powder concentrator 35 utilizes the raw material after 37 pairs of pulverizing of blade to carry out classification.And, be provided with fixed blade 37a in blade top and powder concentrator 35 the 37 corresponding positions of cone 18.Be formed with product outlet 39 on the top of housing 9, the raw material after described product outlet 39 is used for pulverizing is together discharged as product and gas.

Be formed with the loss of weight portion 41 of the weight that for example is used for alleviating rotating grinding board 7 at the middle section 11 of rotating grinding board 7.The plane of loss of weight portion 41 is the circle shape, and embedding in the upper end of described loss of weight portion 41 has liner plate 43 made of iron.Below liner plate 43, be equipped with for the not shown rib of strengthening rotating grinding board 7.

In the vertical crusher 1 that constitutes like this, scraper plate 15 being installed under the state of cone 18 via bolster 17, between scraper plate 15 and rotating grinding board 7, be formed with gap 59.The height h in this gap 59 becomes the bed thickness of raw material layer.The height h in this gap 59 is set to for example 50mm.

And, be set at the diameter with rotating grinding board 7 under the situation of D, be set to the distance H 1 of the upper surface of rotating grinding board 7 from the lower surface of chute 19 (perhaps cone 18) and satisfy H1=D * (0.1~0.2) [mm].And, being set at the diameter with rotating grinding board 7 under the situation of D, the height H 2 of scraper plate 15 is set to and satisfies H2=D * (0.015~0.02) [mm].Therefore, the distance H 3 from the upper surface of scraper plate 15 to the upper surface of rotating grinding board 7 is H3=H2+h[mm].And, owing to together determine the bed thickness of raw material layer with gap 59, so the height H 4 of blocking material ring 47 is variable.

Like this, the bottom of the cone 18 of middle section 11 tops installed and is fixed in by scraper plate 15 in the mode of the amount of the height h that left gap 59 from middle section 11, therefore, scraper plate 15 is fixed to and does not contact with rotating grinding board 7 and not driven with the rotation of this rotating grinding board 7.Therefore, pile up like a mountain on the middle section 11 of rotating grinding board 7 and raw material stops up chute 19 can effectively to prevent raw material, can make flowing and the raw material layer homogenising of raw material.

Vertical crusher 1 moves as following.At first, under the state that makes rotating grinding board 7 rotations, new raw material is supplied on the middle section 11 of rotating grinding board 7 from chute 19.As new raw material, can consider slag that mean particle dia is bigger and moist or grog etc.Be supplied to new raw material on the middle section 11 owing to the rotation of rotating grinding board 7 is subjected to centrifugal force towards the mill radial direction, thereby while on rotating grinding board 7, slide to peripheral direction and move.At this moment, raw material is subjected to the power of direction of rotation by rotating grinding board 7, this raw material and rotating grinding board 7 between slide, thereby carry out the go round and round a millstone slow slightly rotation of rotating speed of dish 7 of specific rotation.

Thus, the raw material that is used for being supplied to middle section 11 by the synthetic masterpiece of the power of the radial direction of rotating grinding board 7 and this both direction of direction of rotation, therefore, Yi Bian raw material is drawn out spiral helicine track on rotating grinding board 7, Yi Bian be directed to grinding roller scroll zones 13 from middle section 11.At this moment, rotating grinding board 7 rotates below scraper plate 15 across gap 59, and described gap 59 is arranged at rotating grinding board 7 and is between the scraper plate 15 that rotates under the state that is obstructed, and therefore, makes the bed thickness that is supplied to the raw material on the middle section 11 fix.

By bed thickness is fixed, can prevent on the stockpile mass in the middle zone 11, thereby can for example improve maintainability.That is, in the running of vertical crusher 1, the physics value of raw material constantly changes.Particularly, taken place under the situation of change in the size distribution that influences the raw material flowability or moisture, the raw material that is supplied to rotating grinding board 7 can be trapped on the middle section 11, thereby causes bed thickness to change.Thus, raw material is with respect to the engaging-in rate change of pulverization roller 21 or help roll 22, so the differential pressure of vertical crusher 1 becomes unstable, must adjust the raw material supplying amount, consequently causes crush efficiency to reduce.

Therefore, by as the vertical crusher 1 of present embodiment, scraper plate 15 being set, fixedly be effective thereby raw material layer on the rotating grinding board 7 is become evenly make bed thickness.And, under the mobile relatively poor situation of raw material, when vertical crusher 1 shuts down, raw material can be deposited on the middle section 11 of rotating grinding board 7 with maintaining the original state, therefore maintainability is significantly worsened, still, utilize above-mentioned scraper plate 15 can also prevent such unfavorable condition.

Bed thickness is fixed and is blocked by blocking material ring 47 by the raw material that the middle section 11 from rotating grinding board 7 guides to grinding roller scroll zones 13 in the mode of drawing helix.On grinding roller scroll zones 13, be pressed in this zone 13 pulverization roller 21 and help roll 22 roll along with the rotation of rotating grinding board 7 drivenly.Raw material from and the angled direction of the axis direction of roller enter between pulverization roller 21 and help roll 22 the two and the rotating grinding board 7, and by engaging-in and carry out exhaust and pulverizing.

Be blown in the housing 9 from annulus passage 31 from gases such as the air of airduct 33 or hot blasts.After pulverizing, cross the raw material of blocking material ring 47 or disperse when pulverizing and among the raw material that in machine, swims or the inner loop raw material mean particle dia be not king-sized raw material along with above the air-flow of gas is blown to.

Blowed to the raw material of top along with gas rises in housing 9, and be subjected to grading by the blade 37 of superposed powder concentrator 35, the raw material of prescribed particle size is together discharged from product outlet 39 as product and gas.Meanwhile, thicker powder drops on the rotating grinding board 7 as the inner loop raw material again via cone 18 and is pulverized.As the prescribed particle size of product, for example average particle diameter (=Dp50) for the granularity of about 5~20 μ m is preferred, the following granularity of 15 μ m more preferably.

Among the raw material of having crossed blocking material ring 47, the king-sized raw material of mean particle dia or contain metal etc. and heavy especially raw material falls to the below of vertical crusher 1 from annulus passage 31, and be taken out to the outside from the bottom of vertical crusher 1.As required, utilize the not shown line that transports to make the raw material of taking-up be back to chute 19 again, thereby pulverize in vertical crusher 1 by outer loop.

In the present embodiment, pulverization roller 21 forms the diameter bigger than the diameter of help roll 22.Because help roll 22 is not for the roller of pulverizing raw material, therefore, compares less the getting final product of plus-pressure that 22 pairs of rotating grinding boards 7 of help roll apply with pulverization roller 21.Be set at RD, the width dimensions of roller is set at W, will be set under the situation of F as the signature pressure that roller is pressed on the power of rotating grinding board 7 along vertical direction at the diameter with the central portion of the thickness direction of roller, if the center line of the width of roller and the angle of inclination between the vertical axis are set at θ, then each roller 21,22 are pressed on the roller surface pressing S (Mpa) of rotating grinding board 7 by S=(F * cos θ)/(W * RD) represent.

Specifically, in the unit projected area of pulverization roller 21, the load (roller surface pressing S) that is applied to pulverization roller 21 is 9~12kg/cm 2(0.882~1.176Mpa), in the unit projected area of help roll 22, the load (roller surface pressing S) that is applied to help roll 22 is 2~5kg/cm 2(0.196~0.49Mpa).By such setting roller surface pressing S, can pulverize with the crush efficiency of the best.

As the result in order to attempt constantly attentively studying from suppressing in essence to mill vibration, the applicant has obtained following such understanding.At first, analyzed the essence of the vibration of milling.At this moment, be what is sought to the starting point of the vibration of milling, the result finds out that its reason is the sliding phenomenon of the moment of pulverization roller 21, and has understood fully: is that starting point can continue to produce the diffusion vibration with this sliding phenomenon.But also understood: the occurrence cause of the sliding phenomenon of moment is because coefficient of friction reduces.

In vertical crusher 1, wish to get average particle diameter (=Dp50) under the situation of the fine product below the 15 μ m, because the specific area of particulate increases, therefore in raw material layer, there is the such medium of more gas, thereby cause coefficient of friction to reduce gradually, therefore, will obtain fine product, grinding mill is easy vibration the more just.

And, as the applicant's experimental result, having obtained new opinion, this opinion has been overthrown of science going up the final conclusion of coefficient of friction, i.e. following law (a)~(c): (a) coefficient of friction is by material and the decision of its surface roughness of mutual friction; (b) coefficient of friction and vertical force are proportional, and irrelevant with the size of contact area; And (c) size of coefficient of friction and sliding speed is irrelevant.That is, as can be known: the final conclusion of above-mentioned (a)~(c) is applicable to be a material and the situation of its size more than mm unit, and there is significant environmental difference in the situation of the pulverizing portion of this and vertical crusher 1.

Therefore, the applicant not only is conceived to the bigger particulate more than the mm of the new new raw material that drops in the pulverizing portion of vertical crusher 1, also be conceived to following situation: if the granularity of desired product is less, then the mean particle dia of the inner loop raw material of circulation is μ m unit in pulverizer 1; With the inner loop raw material of circulation in pulverizer 1 be not single particulate, but the particulate group who mixes with gas.

Based on such starting point, implemented various experiments, the result has obtained dependency relation shown in Figure 4.Fig. 4 is the figure that rotating grinding board speed and the dependency relation between the coefficient of kinetic friction of vertical crusher 1 are shown, and at the longitudinal axis coefficient of kinetic friction is shown with percentage respectively, at transverse axis rotating speed is shown.Can be clear that according to this figure and to have following trend: if mean particle dia diminishes, then coefficient of friction can significantly reduce.

Find: this trend can produce subtle difference according to the kind of 1 raw material to be processed of vertical crusher etc., but does not change substantially.Therefore, the coefficient of friction under the state that media such as gas and raw material are mixed is called " virtual friction coefficient ".And, as shown in Figure 4, as result of experiment, find: the final conclusion that the coefficient of friction that the virtual friction coefficient has been overthrown above-mentioned (c) and the size of sliding speed have nothing to do.That is, as shown in Figure 4, can think that when speed increased, the virtual friction coefficient significantly reduced.

In vertical crusher 1, owing in raw material layer, there is a such medium of gas, therefore we can say, be difficult in the existence of ignoring the such medium of gas in the environment of pulverizing portion of vertical crusher 1 fully and use above-mentioned final conclusion (a)~(c).Hence one can see that, in order to suppress the vibration of milling of vertical crusher 1, keeps regularly or increase virtual friction coefficient particular importance.

And owing to contain the such medium of gas in raw material layer, therefore as can be known, the scavenging action of raw material layer is extremely important, and how removing gas is maximum problem.And find: as the final conclusion of above-mentioned (b), known coefficient of friction and vertical force are proportional, but this is applicable to the raw material more than the mm unit-sized, if be applied under the environment of pulverizing portion of vertical crusher 1, then not too suitable.

This be because, in the vertical crusher 1, particulate and the gas of raw material mix, therefore, even will pulverize and destroy particulate, particulate also can be driven away under pulverization roller 21 by this gas.Therefore, pulverizing is not exerted an influence fully.Therefore, need make the particulate of the raw material that mixes with media such as gases stay pulverization roller 21 under, in the vertical crusher 1 of present embodiment, blocking material ring 47 is being undertaken such effect.

That is, owing to utilize this blocking material ring 47 to prevent that the raw material layer of grinding roller scroll zones 13 from overflowing from rotating grinding board 7, therefore can increase the virtual friction coefficient effectively.And, because help roll 22 is moved with roller surface pressing as described above, therefore can further significantly increase the virtual friction coefficient.

And find, as shown in Figure 5, if make the roller surface pressing of help roll 22 too high, the virtual friction coefficient is reduced, thereby be easy to generate the vibration of milling.Fig. 5 illustrates the contact pressure of help roll 22 of vertical crusher 1 and the figure of the dependency relation between the virtual friction coefficient, at the longitudinal axis virtual friction coefficient is shown with percentage respectively, at transverse axis contact pressure is shown.

When making the roller surface pressing too high, the vibration of milling easily, this is remarkable observed trend in vertical crusher in the past, this becomes with making pulverizing load and acts on the identical situation of the situation of all pulverization rollers in a plurality of pulverization rollers 21, therefore, consequently can bring out the vibration of milling.Thus, in the vertical crusher 1 of present embodiment, in order effectively to suppress to mill vibration to improve crush efficiency, adopted following such structure.

That is, as mentioned above, pulverization roller 21 and help roll 22 have been adopted in groups.Thus, can after utilizing raw material layer on 22 pairs of rotating grinding boards 7 of the less help roll of roller surface pressing to carry out exhaust, utilize the bigger pulverization roller of roller surface pressing 21 to pulverize, therefore, can improve the effect that compresses of raw material layer on the grinding roller scroll zones 13, thereby improve crush efficiency.

And, for help roll 22, also exist only utilize help roll 22 deadweight with it by the method that is pressed on the rotating grinding board 7, in this case, even the more weak parts of cantilever or roll shaft equal strength also can use, therefore there is the such advantage of manufacturing installation at an easy rate.

, only utilize help roll 22 can't obtain sufficient surface pressing to cause the inadequate situation of exhaust, therefore, in aforesaid present embodiment, as preferred mode, record and narrate the scope that pair help roll 22 preferred surface pressings are arranged owing to also existing.

And, the close rotating grinding board 7 in the lower end of chute 19 and cone 18 is configured, scraper plate 15 is mounted on cone 18, and has set the distance of each configuration relation and the parameter of size as described above.Thus, can eliminate the stockpile on the middle section 11 that is deposited in rotating grinding board 7, thereby make the bed thickness of raw material layer even, and, can also prevent from stopping up chute 19.Therefore, can improve crush efficiency.And, by adopting such chute 19, cone 18 and scraper plate 15, can further improve the exhaust effect of help roll 22, further improve crush efficiency while therefore can suppress vibration.

And, dispose the blocking material ring 47 that can carry out Height Adjustment in the outer peripheral edges portion of rotating grinding board 7.The thickness of the raw material layer on the rotating grinding board 7 also is subjected to the effect of altitude of blocking material ring 47, and therefore, the height by making this blocking material ring 47 can further improve crush efficiency according to the changeable parameters of chute 19 or scraper plate 15 etc.

And, the arrangement angles of scraper plate 15 is for for example by the angle of following two straight lines regulation: described two straight lines are the straight line of the length direction of the straight line that gets between the central point that links opposed two pulverization rollers 21 and scraper plate 15, arrangement angles at Fig. 2 middle scraper 15 is set to about 45 °, but can be set at various angles.And pulverization roller 21 and help roll 22 are one group with two respectively, and dispose one group respectively, but also can dispose many groups according to the ability of vertical crusher 1 more.

Particularly, under the situation of the vertical crusher 1 that designs bigger disposal ability, the whole overall dimensions of device can become big along with the increase for the treatment of capacity, but if the size of pulverization roller 21 is maximized, then the engaging-in speed of raw material can significantly increase, consequently, as shown in Figure 4, the virtual friction coefficient diminishes, and pulverization roller 21 becomes the situation of easy slip.

The present invention is by using help roll 22 raw material layer is compressed and the laggard row of exhaust being pulverized, and the virtual friction coefficient can be increased in case sliding stop, thereby disposal ability can be improved, be preferred aspect the maximization of vertical crusher 1 therefore.

Claims (6)

1. a vertical crusher is characterized in that,
Described vertical crusher comprises:
Chute cylindraceous, it is used for supplying with new raw material;
Funnelform cone, it is disposed at the outer circumferential side of described chute, is used for supplying with the inner loop raw material;
Rotating grinding board, the grinding roller scroll zones that it has middle section and is positioned at described its central area, new raw material is supplied to described middle section from described chute, and the inner loop raw material is supplied to described middle section from described cone, and this rotating grinding board guides to described grinding roller scroll zones with described each raw material from described middle section by rotation;
Pulverization roller and help roll, it rolls in described grinding roller scroll zones being pressed under the state of described grinding roller scroll zones along with the rotation of described rotating grinding board drivenly;
Blocking material ring, it is arranged in the outer peripheral edges portion of described rotating grinding board, is used for blocking described each raw material that has passed through between described rotating grinding board and each roller; And
Scraper plate, its mode with the inboard that is positioned at described grinding roller scroll zones is configured in the top of described middle section, and guiding is fixed to the bed thickness of described each raw material of described grinding roller scroll zones,
The bottom of described cone is installed and is fixed in two ends of described scraper plate via bolster.
2. vertical crusher according to claim 1 is characterized in that,
Described chute is the chute that vertically extends towards rotating grinding board central authorities from the top of vertical crusher.
3. vertical crusher according to claim 1 and 2 is characterized in that,
Be set at the diameter with described rotating grinding board under the situation of D, be set to the distance H 1 of the upper surface of described rotating grinding board from the lower surface of described chute and satisfy H1=D * (0.1~02) [mm].
4. according to each the described vertical crusher in the claim 1~3, it is characterized in that,
Be set at the diameter with described rotating grinding board under the situation of D, the height H 2 of described scraper plate is set to and satisfies H2=D * (0.015~0.02) [mm],
Be under the situation of h with the height setting between described rotating grinding board and the described scraper plate, the distance H 3 of the upper surface from the upper surface of described rotating grinding board to described scraper plate is set to H2+h[mm].
5. according to each the described vertical crusher in the claim 1~4, it is characterized in that,
By the unit projected area of described pulverization roller, the load that is applied to described pulverization roller is set to 9~12kg/cm 2,
By the unit projected area of described help roll, the load that is applied to described help roll is set to 2~5kg/cm 2
6. according to each the described vertical crusher in the claim 1~5, it is characterized in that,
Described blocking material ring constitutes and can carry out Height Adjustment.
CN201210102101.0A 2012-02-13 2012-04-09 Vertical crusher CN103240148B (en)

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