CN102049329A - Roller type mill - Google Patents

Roller type mill Download PDF

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Publication number
CN102049329A
CN102049329A CN2009102090711A CN200910209071A CN102049329A CN 102049329 A CN102049329 A CN 102049329A CN 2009102090711 A CN2009102090711 A CN 2009102090711A CN 200910209071 A CN200910209071 A CN 200910209071A CN 102049329 A CN102049329 A CN 102049329A
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China
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roller
roll
ring
control
mentioned
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CN2009102090711A
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Chinese (zh)
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CN102049329B (en
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井上芳隆
初谷长治
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Inoue Mfg Inc
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Inoue Mfg Inc
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Publication of CN102049329A publication Critical patent/CN102049329A/en
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Abstract

The utility model provides a roller type mill for carrying out uniform mixing-distributed processing to micro powder-nano particles in processing materials and other matters in the manufacturing process of ink, coatings, ceramics, medicaments, foods, electronic materials and other various products, and particularly relates to a fully-automatic and electronic control roller type mill capable of automatically controlling the distances among rollers. A front roller (2) and a rear roller (3) which can slightly move relatively to a middle roller 1 along the right-angle direction of the rollers under the action of a servo motor and a ball screw are arranged on a stand of the roller type mill. A laser sensor (18) for measuring the distances among the rollers and a force measurement sensor (10) for measuring the pushing pressure among the rollers are arranged between the middle roller and the front roller and between the middle roller and the rear roller. The roller type mill is provided with an automatic and electronic control mechanism for feeding back and managing a detection signal from each sensor to be a certain distance and a certain pushing pressure. The position of a movable roller is adjusted by driving the servo motor.

Description

Ring-roller mill
Technical field
The present invention relates to the ring-roller mill of use in wet type is disperseed, more particularly, relate in the manufacturing process of China ink, coating, pottery, medicine, food, electronic material and other various products, the ring-roller mill in order to handle material mixing-dispersion treatment such as powder body-nano particle in the material and to use.
Background technology
To handle the device of the material mixing-dispersion treatment such as powder body-nano particle in the material as being used for, and make the different a plurality of rollers of rotating speed, for example preliminary roller, central roll, back roller widely along horizontal 3 ring-roller mills arranged side by side 3.And, in this ring-roller mill, for example open strictly according to the facts shown in the flat 1-83438 communique, with the load of force cell (dynamometer) detection effect between roller, move distance between dancer rools by make preliminary roller and back roller with manual manipulation.Only by controls automatically such as servo motors, then can produce following such variety of issue if want to replace such manual manipulation, only the load control of being undertaken by force cell is difficult to control automatically exactly.
Generally, the ring-roller mill that is used for handling material mixing-dispersions is provided with afterwards roller, preliminary roller as shown in Figure 1 movably on pallet (framework), each roller has roll shaft at both ends, on roll shaft, be equipped with and omitted illustrated bearing, be applied in pushing force via this bearing.The bearing fixing of the roll shaft of the central roll between above-mentioned back roller and preliminary roller is on pallet.Thereby, pushing away on the side roller contact wire of two rollers " pushing force b " arranged, on fixation side roller contact wire, produce " reaction force a ".On the surface of roller, be provided with convex surface R1, R2, so that this pushing force (contact reaction force) is not as among Fig. 2 being the curve as c or d and be the distribution (a smooth line) of certain value on contact wire.In addition, push away the side roller and rotate with different mutually rotating speeds with the fixation side roller, they are actuated to make and also produce frictional force that between two rollers this frictional force is also born the part of dispersion effect.
Above-mentioned pushing force (or reaction force) is in the lip-deep convex surface of roller and has certain relevant delicate relation, and this dependency relation must be set up association in theory with the relation of appropriate cause and effect.In addition, the frictional force that is applied between two rollers is brought influence to this pushing force (or reaction force), as can be known this influence be as the variation of pushing force the existence that can not ignore.That is, become (extrapolation pushing; P1, P2)=(pushing on the contact wire)+(because frictional force bring variation), the extrapolation pushing force can former state become the pushing force on the contact wire.
For such phenomenon, basically make the limited analysis of essentials model of combination of two rollers of these contacts, carry out on contact wire the temporary transient non-linear parsing that contact portion enlarges in the load that increases, obtain particularly based on this parsing from the back roller pushing P1, from the pushing P2 of preliminary roller, convex surface R1, the convex surface R2 of central roll, the convex surface R3 of preliminary roller and the relation apart from δ 1, central roll and preliminary roller of back roller and central roll of back roller apart from δ 2.
In addition, about the friction between roller, as mentioned above, if known existence friction, then it participates in as variation, and required " pushing force " is dilatory to incorrect direction.Thereby, just passable as long as the pushing of above-mentioned each roller and roll gap are kept the relation of P1, P2 when not rubbing, δ 1, δ 2.For this reason, just passable as long as will remove the δ 1, the δ 2 that are left behind P1, the P2 as can be known as the index of control.Given this, as long as carry out displacement control, roll gap δ 1, the δ 2 of decision when maintaining the processing beginning is just passable for the control running of promptly carrying out ring-roller mill.
More particularly,, certain roller size is arranged, and the pushing force of the dispersion processing aspect that the user requires is arranged about ring-roller mill.Use these at first to implement the quiet parsing of a roller.What kind of value the curve shape and the peak of curve (being in central authorities usually) of the additional convex surface of pair roller are then as can be known according to its result.Then, enroll this analysis result, to the roller analytic modell analytical model change that has added convex surface.Use two these models, make the contact analytic modell analytical model of the convex surface peak part contact that only makes central authorities at first.With with 1 roller as stationary roll, implement limited factors method nonlinear contact from the program of the two end portions effect same load of another roller at backing roll both ends according to the load increment method and resolve.Thereby load is cut apart meticulously according to each step, finally reaches P1 or P2.Consequently roughly be in " certain reaction force " such shape among Fig. 2.Obtain having the distribution of certain pushing force (or reaction force) according to this result on contact wire, obtain R1, R2, R3, P1, P2, δ 1, δ 2 as correlation values this moment.Convex surface amount when R1 wherein, R2, R3 are used as the roller design, remaining P1, P2, δ 1, δ 2 become the numerical value that uses in controlling automatically.
As mentioned above, the automatic control of ring-roller mill is the preferably displacement control by the position of sensor measuring roll basically, but, carry out the correction of part while except displacement control, need to monitor load owing to only have following such problem by displacement control.At first, because following undesirable condition can take place in the imbalance of the load of holding about roller.As shown in Figure 3, usually, the place that contacts the convex shape balance that line pressure and pair roller add at roller and roller is almost smooth distributed load.But in fact, if to establish fulcrum that A, B are roller in Fig. 3, establish C be the central point, establish AC=L2, CB=L1, then in distributed load, the central point C of AB/2=L1=L2 becomes big slightly.
In addition, it is simpler that this distributed load is replaced with the concentrfated load consideration of resolving among the last C, so concentrfated load P2 (P1) in consideration effect here.So the double side acting of ordering at C on roller has moment P2 * L1, P2 * L2 as can be known.But, have because of certain interference to contact the situation that line pressure distributes and to tilt as the hypomere of figure.Have this moment that depart from from central point C the position of P2, for example become L1>L2 (situation that L2>L1) is also arranged certainly.This moment is not if the then total P2 of load control changes, so the above-mentioned moment of result becomes P2 * L1>P2 * L2, the torque difference about generation.Like this, P2 by to the L1 side that is used for this torque difference (B side), be that the moment larger side stretches.This is external is stretched to the A layback when opposite.Thus, always possessing, effect has the power that will make P2 stay central point C, so-called self-regulation power.
But,, then become the mechanism that does not have effect that above-mentioned self-regulation power is arranged if be made as the FEEDBACK CONTROL of having only displacement control in the control.Particularly, control according to displacement, though that holds about also should correct roller is load unbalanced, if but in fact running, then only by displacement control, taken place delicate do not show in the numerical error in displacement when uneven but can detect delicate unbalanced phenomenon as load even can see having time and again when both ends at roller.
And then, " relation of load and displacement " when if " relation of load and displacement " during research real work running and static load, then when effect has pushing P2 (P1) on roller as described above, as shown in Figure 4, contact portion observation in the cross section can become the circle that a bit flattens certainly.That is in Fig. 4, be that distance then is 2R>D for D between R, roll shaft, if establish the radius of roller.If the flattening amount of this moment is made as 2R-D=2d, then in 1 roller, this d can be called the flattening amount.The above-mentioned roll gap δ 1 (δ 2) of this moment is used as D control.
So, whether say when having dropped into material as beginning real work displacement control running apart from D between roll shaft, really not so in fact, but will consider " D+e " that clip the gap e that material brings actual numerical value running as displacement control.Whether thereby it is consistent with the P2 (P1) that static state is obtained to regulate load during at work displacement control running, needs this moment to detect the monitoring value of dynamometer and turns round with " D+e " consistent with P2 (P1).Therefore, under these circumstances, above-mentioned roll gap δ 1 (δ 2) is used as D+e control.
In ring-roller mill, generally should " e " be called the portion of gripping (nip), the portion of gripping that material is dropped into side (the 1st gap) is called feeding especially and grips portion (feed nip), to transfer to the portion of gripping of side (the 2nd gap) to be called baffle plate and grip portion (apron nip), but following in this manual both general designations will be called the portion of gripping.
In addition, known: owing in mixing-dispersion process, between roller, clip the processing material, so the initial thickness of the processing material by gripping portion identical with gap e be thickness e, this thickness e minimizing if mixing-dispersion is proceeded.When grasping on Function e (t) experience of timeliness variation as the time with this thickness e, with above-mentioned e sequencing, above-mentioned roll gap δ 1 (δ 2) is used as D+e (t) control.
And then, in the time will handling material and put in 3 ring-roller mills, be the known fact according to the original character of material, the tendency that descends along with the viscosity of disperseing to proceed material.If imagination should inferior the recycling of machinery multichannel (パ ス), then might be along with viscosity descend, if only keep " displacement control " then the load minimizing that when the road number of times increases, material applied.Current, nearly all be with 3 ring-roller mills example of using of road repeatedly in the industry cycle.Under these circumstances, need carry out dynamometer (load) monitors, even do not apply the mechanism that intervention also can be carried out this correction in program when becoming remarkable from the outside if make when the viscosity of material under certain width descends, then the user can realize the dispersion wanted by the dispersion treatment of 1 operation.Like this, though to possess running control be its variation is regulated in displacement control by dynamometer (force cell) supervision load, by program mechanism.
Problem when in addition, abnormal load having taken place in addition.When supposing that in 3 ring-roller mill processes of running between roller mistake has been sneaked into than big usually object, if just " displacement control ", then controlling organization is wanted to keep its displacement and is produced huge load, and the result also can imagine the situation of the function that loss is mechanical.For corresponding to this; to push measuring dynamometer (force cell) and be inserted in the control system, and can adopt in moment of the situation of the rapid displacement that inevitable triggering has taken place and avoid huge load, the program of protection machinery by feedback rapidly.So-called " avoiding the Security Countermeasures of abnormal load " is assembled in the system aspect dynamometer also be effective.And then, except sandwiching abnormal conditions as described above, the situation that occurs the difference of bigger displacement because of the bias of the processing material on the inhomogeneous or roller of certain significant viscosity etc. is arranged also than usually big object.In addition, under these situations about taking place continuously, aspect the time efficiency of the control that makes the convergence of this difference, as can be known displacement control compare with load control poor slightly.
So, control rapidly for fear of this tediously long property, more preferably, though be made as in the program that load control has taken place displacement control to be switched to when not being the degree that promptly stops but bigger interference temporarily, be made as in the program of disturbing the convergence back directly to return to displacement control from load control.
Summary of the invention
The objective of the invention is to solve each shortcoming of displacement control as described above or load control, the ring-roller mill that provides a kind of and can control roll gap by Automatic Control, dispersion quality is improved.
According to the present invention, a kind of ring-roller mill is provided, it is ring-roller mill in order to handle material mixing-dispersion treatment such as powder body-nano particle in the material and to use, it is characterized in that, has the stationary roll that is fixed on the pallet, but with contact separation be located at mobile roller on this stationary roll, this is moved roller can be provided with on the right angle orientation minute movement ground of servo motor and this roller of ball-screw effect lower edge, be provided with the laser sensor of measuring roll gap between said fixing roller and the mobile roller and be provided with the force cell that pushes between the above-mentioned roller of measurement, possess the detection signal feedback that to bring along with effluxion from each sensor and management between stationary roll and the mobile roller is the certain distance and the automatic electronic controlling mechanism of pushing force necessarily, drive above-mentioned servo motor and regulate the position of mobile roller successively by this automatic electronic controlling mechanism.
And, a kind of ring-roller mill is provided, and as above-mentioned ring-roller mill, is 3 ring-roller mills that have along 3 rollers laterally arranged side by side, the central roll that is fixed on the central authorities on the pallet as stationary roll, will be located at the preliminary roller of front and back of this central roll and back roller as distinguishing the mobile roller of controlling automatically.
In addition, above-mentioned automatic control is to monitor that by force cell load is controlled to be the basis by the displacement of laser sensor control roll gap on one side on one side.And, made when bigger interference has taken place temporarily from displacement control and switch to load control and control, disturbing the convergence back directly to return the program of displacement control from load control.In addition, provide roll gap as to add the above-mentioned automatic control of value programming of the Function e (t) of the time that the timeliness of the thickness of the processing material of expression by gripping portion changes between the roll shaft of the flattening of considering the roller in the work apart from D.
The present invention constitutes as described above, adopt the control of displacement control and load simultaneously, automatically control to keep the roll gap of regulation along with effluxion by FEEDBACK CONTROL, so can access pushing force (reaction force) certain on the contact wire that uses the roller that has convex surface distributes, and can not lose the dispersion effect of the frictional force that produces from rotation difference because of roller, can access flattening amount corresponding to self-regulation and roller, the viscosity of handling material changes, the generation of abnormal load etc. and 3 ring-roller mills such as ring-roller mill of always under predefined certain roller contact force, working, by with this ring-roller mill as dispersion machine, can respond higher dispersion quality (precision) requirement.In other words, the size distribution after the dispersion also is the amplitude narrower than ring-roller mill in the past, and by being made as automatic control, can be with the operation of control technology that depends on the people from the people to mechanical transfer.
Description of drawings
The skeleton diagram of convex surface curve that Fig. 1 is the expression stationary roll when pushing away side roller (mobile roller) and contact under certain pushing force and roller contact wire etc.
Fig. 2 is the key diagram of the distribution pushing force (reaction force) on the contact wire of representing under the roller contact condition.
Fig. 3 is the key diagram that pushing force distributes and self-regulation power concerns on the explanation contact wire.
Fig. 4 is the key diagram that expression is accompanied by the roll gap of the flattening amount that acts on the roller when pushing is arranged.
Fig. 5 is the vertical view of the ring-roller mill of expression one embodiment of the invention.
Fig. 6 is the front view to the mounting portion of pallet of the mobile roller of expression.
Fig. 7 is another routine front view to the mounting portion of pallet of the mobile roller of expression.
The specific embodiment
The present invention can be applied in the manufacturing process of China ink, coating, pottery, medicine, food, electronic material and other various products, in the various ring-roller mills that will handle material mixing-dispersion treatment such as powder body-nano particle in the material and use, and in Fig. 5, Fig. 6, as an embodiment of ring-roller mill of the present invention, but 3 central roll 1 of central authorities is fixing, be provided with preliminary roller 2 and back roller 3 side by side on its horizontal contact separation ground, front and back ring-roller mills have been represented.In Fig. 5, the bearing 5 of the roll shaft 4 of supporting central roll 1 is fixed on the pallet (framework) (diagram slightly), and preliminary roller 2 and back roller 3 are positioned at its both sides.
Preliminary roller 2 and back roller 3 are installed to pallet with roughly the same installation constitution, Fig. 6 represents an embodiment of mounting portion, in the drawings, the servo motor carriage 6 that is fixed on the pallet is arranged in the left side, be provided with displacement thereon and drive dedicated servo motor (diagram slightly), the revolving force of this servo motor is transmitted to ball-screw coupling 7.With the transmission revolving force while, also be subjected to transmitting the reaction force of coming via ball-screw 8, it is transmitted to motor carriage 6.Therefore, be assembled with bearing 9 between the two, the dynamometer (force cell) 10 that is used for the reaction force measurement is installed between carriage 6 and bearing 9 simultaneously.
Ball-screw 8 and ball-screw coupling 7 close securely by bond and combine, with revolving force to the ball-screw transmission.In ball-screw, revolving force is transmitted thrust (propulsive force) via roller tappet 11 to roller bearing retainer 12 by the power of marching forward (propulsive force) conversion.
Ball-screw 8 is installed on the identical leading screw fixed head 13 with roller tappet 11, and LM (rectilinear motion) guidance part 14 is installed on this leading screw fixed head.In addition, same LM guidance part 15 is installed also on roller bearing retainer 12, these two LM guidance parts are made as it are moved on two common tracks, keep both rectilinear propagations.
In the embodiment shown in fig. 6, as can be vertically the structure of rotating bearing ball leading screw 8 movably, ball-screw 8 is fixed on the leading screw fixed head 13, this leading screw fixed head 13 is installed on the framework movably via LM (rectilinear motion) guidance part 14.Fig. 7 represents holding plate is fixed on embodiment on the framework, and holding plate 13a is fixed on the framework, and ball-screw 8 is inserted via bearings such as cylinder roller journal bearing 20 and led in holding plate 13a.By this structure, ball-screw can move axially in the state lower edge that is held the plate supporting.
Be assembled with the roll shaft 16 of back roller (preliminary roller) main body on the bearing in roller bearing retainer 12.On this roll shaft 16, linking CD-ROM drive motor (diagram slightly) respectively via Schmidt's coupling 17.This Schmidt's coupling 17 is the parallel mobile mechanisms that can carry out axle in the different transmission of power in axle center in rotation, so by this mechanism, can be when roll shaft 16 being allowed the moving of right angle orientation, in the future self-driven motor the rotary driving force constant speed pass to this roll shaft 16.
In order to measure the distance between servo motor carriage 6 and the roller exactly, on servo motor carriage 6, be fixed with laser displacement gauge (laser sensor) 18, the roller flange part direct irradiation laser light on the end that is present in roller is come measuring distance.
Because above-mentioned servo motor carriage 6 is fixed on the pallet, the bearing 5 of the roll shaft 4 of above-mentioned central roll 1 also is fixed on the pallet, so, can measure the roll shaft 4 of central roll and the back distance between the roll shaft 16 of roller 3 (preliminary roller 2) by measuring the distance between servo motor carriage 6 and the roller (flange).Distance between this servo motor carriage 6 and the roller (flange) by initial pushing (static state) decision, is carried out FEEDBACK CONTROL so that it becomes necessarily later in roller drives under the roller inactive state.Use ball-screw propulsive force according to the servo motor revolving force for this control.In addition, being provided with automatic electronic controlling mechanism, is certain distance, certain pushing so that it drives by FEEDBACK CONTROL moment that above-mentioned servo motor manages.
As shown in Figure 5, Fig. 6, control system shown in Figure 7 are equipped in 4 places altogether at the two ends, the left and right sides of the two ends, the left and right sides of preliminary roller 2, back roller 3, and they are via on the fixing pallet at grade of LM guidance part, and the two ends, the left and right sides of central roll are fixed on the pallet.Thereby, if above-mentioned ring-roller mill running, then bringing roll gap and moment to bring between the roller that acts on the roller by above-mentioned laser sensor 18 and 10 moments of force cell (dynamometer) pushes, so by driving above-mentioned servo motor from the detection signal feedback of this sensor, making roll shaft 16 edges and roller right angle orientation minute movement, automatically optimum operation is certain distance, certain pushing, can improve dispersion effect.At this moment, control monitors that by force cell load is controlled to be the basis by the displacement of laser sensor control roll gap on one side with one side as mentioned above automatically.And, be made as when bigger interference takes place temporarily from displacement control switch to load control and control, in the program of disturbing the convergence back directly to get back to displacement control from load control.In addition, also adopt roll gap as to having added the above-mentioned automatic control that the value of the Function e (t) of the time that the timeliness of the thickness of the processing material of expression by gripping portion changes is programmed apart from D between the roll shaft of the flattening of considering the roller in the work.

Claims (7)

1. ring-roller mill, it is ring-roller mill in order to handle material mixing-dispersion treatment such as powder body-nano particle in the material and to use, it is characterized in that, has the stationary roll that is fixed on the pallet, but with contact separation be located at mobile roller on this stationary roll, this is moved roller can be provided with on the right angle orientation minute movement ground of servo motor and this roller of ball-screw effect lower edge, be provided with the laser sensor of measuring roll gap between said fixing roller and the mobile roller and be provided with the force cell that pushes between the above-mentioned roller of measurement, possess the detection signal feedback that to bring along with effluxion from each sensor and management between stationary roll and the mobile roller is the certain distance and the automatic electronic controlling mechanism of pushing force necessarily, drive above-mentioned servo motor and regulate the position of mobile roller successively by this automatic electronic controlling mechanism.
2. ring-roller mill as claimed in claim 1, it is characterized in that, above-mentioned ring-roller mill is 3 ring-roller mills that have along 3 rollers laterally arranged side by side, to be fixed on the central roll of central authorities of pallet as stationary roll, with being located at the preliminary roller of front and back of this central roll and back roller, made and to have moved in the right angle orientation of servo motor and ball-screw effect lower edge central roll so that the mobile roller that the contact wire pushing force between each roller that produces between central roll and preliminary roller, central roll and the back roller is all equated on which position on the contact wire as mobile roller.
3. ring-roller mill as claimed in claim 2, it is characterized in that, on preliminary roller, central roll, back roller, be provided with convex surface, the variation of pushing force that is accompanied by the difference of the frictional force by the rotation difference generation between each pair roller of preliminary roller and central roll, central roll and back roller also added up to feed back to automatic electronic controlling mechanism.
4. ring-roller mill as claimed in claim 3 is characterized in that, above-mentioned automatic electronic controlling mechanism is to monitor the displacement control of load one side by laser sensor control roll gap by force cell on one side.
5. ring-roller mill as claimed in claim 4, it is characterized in that, above-mentioned automatic electronic controlling mechanism is to monitor the displacement control of load one side by laser sensor control roll gap by force cell on one side, be made as in the program of disturbing the convergence back directly to return to displacement control to the program of switching according to the load control of force cell though be made as having taken place when not being the degree that promptly stops but bigger interference temporarily from load control from displacement control.
6. as claim 4 or 5 described ring-roller mills, it is characterized in that above-mentioned roll gap is by Function e (t) regulation of the time that changes along the time of the axle base D of the flattening of the contact-making surface of considering the roller in the work, the thickness e of processing material by the portion that grips between roller and thickness e.
7. as claim 2 or 3 described ring-roller mills, it is characterized in that, each roll shaft of the preliminary roller of above-mentioned mobile roller and back roller is attached at respectively on the CD-ROM drive motor, is provided with the Schmidt's coupling that moves of allowing with the roll shaft right angle orientation between the roll shaft of this CD-ROM drive motor and each roller.
CN200910209071.1A 2009-10-30 2009-10-30 Roller type mill Active CN102049329B (en)

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CN102049329B CN102049329B (en) 2014-05-14

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105327732A (en) * 2014-08-06 2016-02-17 丹阳市陵口镇郑店土地股份专业合作社 Chemical fertilizer feedstock smashing device
CN105435895A (en) * 2013-11-13 2016-03-30 蒋春花 Working method for metal crusher
CN105665064A (en) * 2013-11-13 2016-06-15 蒋春花 Working method of metal crusher
CN105728104A (en) * 2016-03-02 2016-07-06 李娟� Liquid auxiliary treatment-based hot ore crushing equipment
CN106166505A (en) * 2016-07-29 2016-11-30 黑龙江金芽粮机科技有限公司 Double grinding strips stay embryo to grind rice device
CN109351430A (en) * 2018-11-13 2019-02-19 姚燊 A kind of industrial crushing material machinery device

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Publication number Priority date Publication date Assignee Title
US20160199841A1 (en) * 2015-01-12 2016-07-14 Kwok Fai Edmund SO Ceramic material granulator

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105435895A (en) * 2013-11-13 2016-03-30 蒋春花 Working method for metal crusher
CN105665064A (en) * 2013-11-13 2016-06-15 蒋春花 Working method of metal crusher
CN105327732A (en) * 2014-08-06 2016-02-17 丹阳市陵口镇郑店土地股份专业合作社 Chemical fertilizer feedstock smashing device
CN105728104A (en) * 2016-03-02 2016-07-06 李娟� Liquid auxiliary treatment-based hot ore crushing equipment
CN106166505A (en) * 2016-07-29 2016-11-30 黑龙江金芽粮机科技有限公司 Double grinding strips stay embryo to grind rice device
CN109351430A (en) * 2018-11-13 2019-02-19 姚燊 A kind of industrial crushing material machinery device

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