CN114377756B - Multilayer double-roller grinding machine and control method thereof - Google Patents
Multilayer double-roller grinding machine and control method thereof Download PDFInfo
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- CN114377756B CN114377756B CN202210062195.7A CN202210062195A CN114377756B CN 114377756 B CN114377756 B CN 114377756B CN 202210062195 A CN202210062195 A CN 202210062195A CN 114377756 B CN114377756 B CN 114377756B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/32—Adjusting, applying pressure to, or controlling the distance between, milling members
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- Crushing And Grinding (AREA)
Abstract
The invention relates to the technical field of grinding machines, in particular to a multilayer double-roller grinding machine and a control method thereof; comprises a frame and a plurality of grinding mechanisms arranged from top to bottom in the frame; wherein, the top end of the frame is provided with an opening; each grinding mechanism comprises a power mechanism, a first roller, a second roller, an adjusting structure, a discharge hopper and two scraping devices; the power mechanism drives the first roller to rotate; the first roller and the second roller are horizontally arranged in a clearance manner and are in transmission connection; the adjusting structure is used for adjusting the gap between the first roller and the second roller; the discharge hopper is arranged below the gap between the first roller and the second roller; the two scraping devices are respectively arranged at the bottom ends of the first roller and the second roller and are used for scraping the slurry on the first roller and the second roller. The invention aims to provide a multilayer double-roller grinding machine and a control method thereof aiming at the defects in the prior art, so that the production efficiency of slurry is improved, and the product quality is improved.
Description
Technical Field
The invention relates to the technical field of grinding machines, in particular to a multilayer double-roller grinding machine and a control method thereof.
Background
The grinder is mainly suitable for manufacturing slurry of paint, printing ink, pigment and the like, is used for fully mixing solid and liquid materials in the slurry, and is particularly suitable for grinding products with high dispersion viscosity and fine granularity requirement.
The grinding machine in the prior art usually adopts a tiled three-roller structure, but the grinding effect of the structure on the slurry is limited, the slurry with larger solid particles needs to be ground for many times, the gap between rollers in the grinding machine needs to be readjusted every time of grinding, the adjustment time is longer, the production efficiency is seriously influenced, and the more important problem is that the slurry can be placed on one side when the grinding machine is adjusted, and the slurry is in contact with air for a longer time, so that the final product quality is influenced.
In view of the above problems, the present inventors have conducted research and innovation based on practical experience and professional knowledge that has been abundant for many years in engineering application of such products, and by using the theory, and have provided a multi-layer double-roll grinder and a control method thereof, which can improve the production efficiency of slurry and the product quality.
Disclosure of Invention
The invention aims to provide a multi-layer double-roller grinding machine and a control method thereof aiming at the defects in the prior art, and solves the problems that the grinding machine in the prior art needs to grind pulp for multiple times, and the grinding machine needs to be adjusted for a longer time each time, so that the production efficiency and the product quality are seriously influenced.
In order to achieve the above object, the present invention provides a multi-layered double roll grinder comprising: the grinding machine comprises a rack and a plurality of grinding mechanisms arranged in the rack from top to bottom;
wherein, the top end of the frame is provided with an opening;
each grinding mechanism comprises a power mechanism, a first roller, a second roller, a gap adjusting mechanism, a discharge hopper and two scraping mechanisms; the power mechanism drives the first roller to rotate; the first roller and the second roller are horizontally arranged in a clearance mode, and are in transmission connection, and the rotating speeds of the first roller and the second roller are different; the gap adjusting mechanism is used for adjusting the gap between the first roller and the second roller; the discharging hopper is arranged below a gap between the first roller and the second roller; the two scraping mechanisms are respectively arranged at the bottom ends of the first roller and the second roller and are used for scraping the slurry on the first roller and the second roller.
Further, the power mechanism comprises a variable frequency motor and a speed reducer, and the variable frequency motor drives the first roller to rotate through the speed reducer.
Further, the clearance adjusting mechanism comprises a first shaft seat, a second shaft seat, a first telescopic rod, a fine adjustment shaft sleeve and a rotating shaft; the first roller and the second roller rotate on the first shaft seat and the second shaft seat respectively; the bottom ends of the first shaft seat and the second shaft seat are respectively hinged with the frame; the top end of the first shaft seat is hinged with one end of the first telescopic rod; the other end of the first telescopic rod is hinged with one end of the fine adjustment shaft sleeve; the other end of the fine tuning shaft sleeve is provided with a threaded hole; one end of the rotating shaft is rotatably arranged at the top end of the second shaft seat; and the other end of the rotating shaft is provided with a thread and is screwed into the threaded hole.
Further, the clearance adjusting mechanism also comprises a fine adjustment gear, a servo motor and a planetary reducer; the fine adjustment gear is fixedly sleeved on the rotating shaft; the servo motor drives the fine adjustment gear to rotate through the planetary reducer.
Furthermore, each scraping mechanism comprises a fixed block, a rotating plate, a scraping plate and a second telescopic rod; the fixed block is fixedly arranged on the rack and is provided with an installation groove; a rotating column is arranged on the side surface of the rotating plate and extends into the mounting groove; the scraper blade with the second telescopic link sets up in the both sides of rotating the post, the scraper blade fixed mounting be close to on the commentaries on classics board first roller or one side of second roller, the motion end of second telescopic link with commentaries on classics board opposite side butt.
Further, the mounting groove comprises a vertical groove and a horizontal groove; the top end of the vertical groove is communicated with the top surface of the fixed block, the bottom end of the vertical groove is communicated with one end of the horizontal groove, and the other end of the horizontal groove extends towards the first roller or the second roller; and the rotating column is positioned at one end of the horizontal groove close to the first roller or the second roller after the installation is finished.
Furthermore, each grinding mechanism also comprises a leakage-proof mechanism which is arranged at two ends of a gap between the first roller and the second roller; the leak protection mechanism sets up the baffle, the baffle both sides support respectively first roller with the top side of second roller, just the bottom downwardly extending of baffle is in the clearance.
Further, each grinding mechanism also comprises a pushing mechanism; mounting ends are arranged at two ends of the first roller and the second roller, and the diameter of each mounting end is smaller than that of the middle section of the first roller and the middle section of the second roller; the baffle sets up in the installation section, push away tight mechanism and be used for making the side of baffle is all the time with the terminal surface laminating of the interlude of first roller with the second roller.
The invention also provides a control method of the multilayer double-roller grinder, which is suitable for the multilayer double-roller grinder, and the plurality of grinding mechanisms are sequentially marked as a 1 st grinding mechanism and a 2 nd grinding mechanism … … nth grinding mechanism from top to bottom; wherein n is a positive integer; then there are:
before the slurry is poured, the first rollers of all grinding mechanisms are kept at V 1 A rotational speed;
after the slurry was poured, the first roll of the No. 1 grinding mechanism was at V 1 Rotational speed t 1 Gradually increasing to V after time 2 A rotational speed; the first roller of the 2 nd grinding mechanism is at V 1 Rotational speed t 2 Gradually increasing to V after time 2 A rotational speed; … … grinding mechanism n has a first roller at V 1 Rotation speed t n Gradually increasing to V after time 2 A rotational speed;
t 1 、t 2 ……t n the numerical values of (A) and (B) are increased in sequence;
V 1 rotational speed and V 2 The relationship of the rotation speed is as follows:
V 1 ＝C×V 2
wherein, V 1 And V 2 The units are the same; and C is a deceleration coefficient, and is related to the transmission ratio of the first roller and the second roller, the viscosity of the slurry and the radius of the first roller.
Further, the value model of the deceleration coefficient C is as follows:
wherein k is a proportional adjustment coefficient, the numerical value is set by a system, and the unit is mm/s; s is the gap distance between the first roller and the second roller, and the unit is mm; l is the effective grinding length of the first roller and is in mm; tau is the viscosity of the slurry in mm 2 S; r is the radius of the first roller and the unit is mm; and i is the transmission ratio of the second roller to the first roller.
Through the technical scheme of the invention, the following technical effects can be realized:
after the slurry is poured into the machine frame from the upper side, the gap between the first roller and the second roller in each grinding mechanism is adjusted through the plurality of grinding mechanisms distributed from top to bottom and the gap adjusting mechanism in each grinding mechanism, so that the slurry is continuously ground.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is also possible for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a front cross-sectional view of a multi-layered double roll grinder in an embodiment of the present invention;
FIG. 2 is a schematic perspective view of a grinding mechanism according to an embodiment of the present invention;
FIG. 3 is another view of a schematic perspective view of a grinding mechanism in an embodiment of the invention;
FIG. 4 is a side view of a grinding mechanism in an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a gap adjustment mechanism according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a scraping mechanism according to an embodiment of the present invention;
FIG. 7 is a schematic view of the slurry flow direction when the grinding mechanism is activated according to an embodiment of the present invention;
reference numerals: the device comprises a frame 1, a power mechanism 2, a variable frequency motor 21, a speed reducer 22, a first roller 3, a second roller 4, a gap adjusting mechanism 5, a first shaft seat 51, a second shaft seat 52, a first telescopic rod 53, a fine adjustment shaft sleeve 54, a rotating shaft 55, a fine adjustment gear 56, a servo motor 57, a planetary speed reducer 58, a discharge hopper 6, a scraping mechanism 7, a fixed block 71, a rotating plate 72, a scraping plate 73, a second telescopic rod 74, a vertical groove 75, a horizontal groove 76, a leakage-proof mechanism 8, a baffle plate 81 and a pushing mechanism 82.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
A multi-layer double-roller grinding machine is disclosed, as shown in figures 1-6, and comprises a frame 1 and a plurality of grinding mechanisms arranged from top to bottom in the frame 1;
wherein, the top end of the frame 1 is provided with an opening; the opening part is preferably provided with a feed hopper which is gradually folded from top to bottom, and the slurry is poured into the opening part above the frame 1 and enters the inside of the frame 1 along the feed hopper.
Each grinding mechanism comprises a power mechanism 2, a first roller 3, a second roller 4, a gap adjusting mechanism 5, a discharge hopper 6 and two scraping mechanisms 7; the power mechanism 2 drives the first roller 3 to rotate; the first roller 3 and the second roller 4 are horizontally arranged in a clearance mode, the first roller 3 is in transmission connection with the second roller 4, the rotating speeds of the first roller 3 and the second roller 4 are different, and therefore the first roller 3 and the second roller 4 can achieve a grinding effect by rubbing slurry at different speeds; the gap adjusting mechanism 5 is used for adjusting the gap between the first roller 3 and the second roller 4; the discharge hopper 6 is arranged below the gap between the first roller 3 and the second roller 4; the two scraping mechanisms 7 are respectively arranged at the bottom ends of the first roller 3 and the second roller 4 and are used for scraping the slurry on the first roller 3 and the second roller 4.
Specifically, before slurry is poured, the gap between the first roller 3 and the second roller 4 in each grinding machine is adjusted through the gap adjusting mechanism 5 of each grinding machine, so that the gap in each grinding machine is reduced from top to bottom; after make first roller 3 and second roller 4 begin to rotate by opening equipment, and pour into thick liquids from the frame 1 top, thick liquids from last grinding through a plurality of grinding mechanisms down, solid particle in the thick liquids will be ground gradually and become the tiny particle of needs, to personnel only need pour into thick liquids from the top and can realize the many times of thick liquids and grind, production efficiency has been promoted effectively, and all accomplish before pouring into thick liquids to the debugging in clearance, make thick liquids can accomplish grinding in the shortest time, avoid thick liquids and air to produce the contact of overlength time, thereby product quality has been guaranteed.
As a preferred arrangement of the power mechanism 2, the power mechanism 2 includes a variable frequency motor 21 and a speed reducer 22, and the variable frequency motor 21 drives the first roller 3 to rotate through the speed reducer 22. The variable frequency motor 21 can realize accurate speed regulation through simple electric control, thereby facilitating the speed regulation of the first roller 3; the speed reducer 22 can increase the torque by reducing the rotating speed, and improve the grinding effect of the first roller 3 on the slurry.
As a preferable configuration of the gap adjusting mechanism 5, the adjusting mechanism 5 includes a first shaft seat 51, a second shaft seat 52, a first telescopic rod 53, a fine adjustment shaft sleeve 54, and a rotating shaft 55; the first roller 3 and the second roller 4 rotate on the first shaft base 51 and the second shaft base 52 respectively; the bottom ends of the first shaft seat 51 and the second shaft seat 52 are respectively hinged with the frame 1; the top end of the first shaft seat 51 is hinged with one end of a first telescopic rod 53; the other end of the first telescopic rod 53 is hinged with one end of the fine tuning shaft sleeve 54; the other end of the fine tuning shaft sleeve 54 is provided with a threaded hole; one end of the rotating shaft 55 is rotatably arranged at the top end of the second shaft seat 52; the other end of the rotating shaft 55 is provided with a thread and is screwed into the threaded hole.
Specifically, the first telescopic rod 53 may be a telescopic cylinder or a telescopic oil cylinder, and the like, and the first telescopic rod 53 may be extended and shortened to push the first shaft seat 51 and the second shaft seat 52 to open and close to each other by a large margin; when the device is machined, the first telescopic rod 53 is in a shortened state, and at the moment, the rotating shaft 55 is rotated, so that the thread on the rotating shaft 55 is screwed into or out of the threaded hole of the fine adjustment shaft sleeve 54, and the fine adjustment of the gap between the first shaft seat 51 and the second shaft seat 52 can be realized.
The backlash adjustment mechanism 5 preferably further includes a fine adjustment gear 56, a servo motor 57, and a planetary reducer 58; the fine adjustment gear 56 is fixedly sleeved on the rotating shaft 55 and is used for driving the rotating shaft 55 to rotate; the servomotor 57 rotates the fine adjustment gear 56 through the planetary reduction gear 58. The servo motor 57 accurately controls the rotational speed and the rotational position, thereby facilitating accurate adjustment.
As a preferable arrangement of the scraping mechanisms 7, each scraping mechanism 7 comprises a fixed block 71, a rotating plate 72, a scraping plate 73 and a second telescopic rod 74; the fixed block 71 is fixedly arranged on the rack 1 and is provided with an installation groove; the side surface of the rotating plate 72 is provided with a rotating column which extends into the mounting groove; the scraper 73 and the second telescopic rod 74 are arranged at two sides of the rotating column, the scraper 73 is fixedly arranged at one side of the rotating plate 72 close to the first roller 3 or the second roller 4, and the moving end of the second telescopic rod 74 is abutted against the other side of the rotating plate 72.
Specifically, the second telescopic rod 74 can be a telescopic cylinder or a telescopic oil cylinder, when the second telescopic rod 74 is extended, one side of the rotating plate 72 can be pushed to rotate the rotating plate 72, and the scraper 73 arranged on the other side of the rotating plate 72 can rotate upwards to finally abut against the side face of the first roller 3 or the second roller 4, so that the surface of the first roller 3 or the second roller 4 is scraped. Preferably, the mounting grooves of the fixing block 71 include a vertical groove 75 and a horizontal groove 76; the top end of the vertical groove 75 is communicated with the top surface of the fixed block 71, the bottom end of the vertical groove is communicated with one end of the horizontal groove 76, and the other end of the horizontal groove 76 extends towards the first roller 3 or the second roller 4; through the structure, the rotating column can be put in from the communication position of the vertical groove 75 and the top surface of the fixed block 71, and then enters the horizontal groove 76 through the vertical groove 75 to complete installation, so that the installation of personnel is facilitated; rotate the post and be located the one end that horizontal groove 76 is close to first roller 3 or second roller 4 after the installation is accomplished, make and rotate the post and can have in horizontal groove 76 to keep away from the gliding ability of first roller 3 or second roller 4, when first roller 3 or second roller 4 produce the skew, second telescopic link 74 extension is promoting commentaries on classics board 72 pivoted in-process, commentaries on classics board 72 is whole can rotate the slip of post through both ends and produce the skew that adapts to first roller 3 or second roller 4 automatically, thereby guarantee thereby scraper blade 73 can guarantee with first roller 3 or the laminating of second roller 4 and strike off the effect.
Each grinding mechanism preferably further comprises a leakage-proof mechanism 8 which is arranged at two ends of the gap between the first roller 3 and the second roller 4; the leak protection mechanism 8 sets up baffle 81, and the top side that first roller 3 and second roller 4 were supported respectively to baffle 81 both sides, and in the bottom downwardly extending of baffle 81 reached the clearance, baffle 81 can prevent effectively that thick liquids from spilling from the both ends in the clearance of first roller 3 and second roller 4, makes whole thick liquids homoenergetic ground, guarantees product quality. Each grinding mechanism preferably further includes a pushing mechanism 82; mounting ends are arranged at two ends of the first roller 3 and the second roller 4, and the diameters of the mounting ends are smaller than the middle sections of the first roller 3 and the second roller 4; the baffle 81 is arranged at the installation section, and the pushing mechanism 82 is used for enabling the side surface of the baffle 81 to be always attached to the end surface of the middle section of the first roller 3 and the second roller 4. Specifically, the pushing mechanism 82 may be an air spring structure abutting against the baffle 81, or a structure including a abutting block abutting against the side surface of the baffle 81 and a spring arranged in the abutting block and the frame, and by attaching the side surface of the baffle 81 to the end surface of the middle section of the first roller 3 or the second roller 4, it is ensured that no gap is generated between the baffle 81 and the first roller 3 or the second roller 4, thereby preventing the slurry from leaking and further ensuring the product quality.
The invention also relates to a control method of the multilayer double-roller grinder, which is suitable for the multilayer double-roller grinder, and the plurality of grinding mechanisms are sequentially marked as a 1 st grinding mechanism and a 2 nd grinding mechanism … … nth grinding mechanism from top to bottom; wherein n is a positive integer; then there are:
before the slurry is poured, the first rollers 3 of all the grinding mechanisms are kept at V 1 A rotational speed;
after the slurry was poured, the first roll 3 of the No. 1 grinding mechanism was at V 1 Rotational speed t 1 Gradually increasing to V after time 2 A rotational speed; the first roller 3 of the 2 nd grinding mechanism is at V 1 Rotational speed t 2 Gradually increasing to V after time 2 A rotational speed; … …The first roller 3 of the n-th grinding mechanism is at V 1 Rotational speed t n Gradually increasing to V after time 2 A rotational speed;
t 1 、t 2 ……t n the numerical values of (A) and (B) are increased in sequence;
V 1 rotational speed and V 2 The relationship of the rotation speed is as follows:
V 1 ＝C×V 2
wherein, V 1 And V 2 The units are the same; and C is a deceleration coefficient, and is related to the transmission ratio of the second roller 4 to the first roller 3, the viscosity of the slurry and the radius of the first roller 3.
Specifically, when slurry is poured, if the rotating speeds of the first roller 3 and the second roller 4 are too high, slurry is easily splashed, so that the rotating speeds of the first roller 3 and the second roller 4 need to be reduced; more importantly, as shown in fig. 7, since there must be a certain difference between the rotation speeds of the first roller 3 and the second roller 4 to rub the slurry for grinding, usually the rotation speed of the first roller 3 is several times of the rotation speed of the second roller 4, so the linear speed of the surface contacting with the slurry is also greatly different, if the rotation speeds of the first roller 3 and the second roller 4 are faster, the difference between the linear speeds of the surfaces of the first roller 3 and the second roller 4 is larger, the kinetic energy obtained by the slurry at the a side is several times larger than that of the slurry at the B side, since the viscosity of the slurry is larger, and the gap between the first roller 3 and the second roller 4 is smaller (usually only tens of micrometers or even several micrometers), the slurry at the a side flows back to the B side more easily than the slurry at the active position, and the kinetic energy of the slurry at the B side is not enough to block the slurry flowing back, and even the slurry at the back flow, this results in the slurry being difficult to drop from the gap during the initial start-up of the mill, and the grinding mechanism starts slowly.
In the method, the rotating speeds of the first roller 3 and the second roller 4 are kept at the slower rotating speeds, although certain grinding effect and efficiency are abandoned at the initial starting stage, the difference between the linear speeds of the surfaces of the first roller 3 and the second roller 4 is smaller, so that the kinetic energy difference between the slurry on the A side and the slurry on the B side is smaller, and the difference between the flow speeds is smaller, therefore, the slurry on the A side and the slurry on the B side can be used for grinding the slurry on the B side and the slurry on the A sideThe limitation is generated mutually, so that the slurry on the two sides flows to the gap rapidly, and the rapid starting of the grinding mechanism is realized; when the slurry forms stable flow passing through the gap, the rotating speeds of the first roller 3 and the second roller 4 can be slowly increased, even though the kinetic energy difference exists between the slurry on the two sides of A, B, the slurry on the two sides of A, B should be a flow channel passing through the gap, the slurry on the two sides of A, B passively enters the gap preferentially under the influence of the flow channel, the backflow amount is obviously small, and therefore the rotating speeds of the first roller 3 and the second roller 4 can be increased to V 2 Thereby ensuring the grinding effect and efficiency in subsequent work.
Since the time for the slurry to reach each grinding mechanism is different, t is set to ensure that each grinding mechanism can be started quickly 1 、t 2 ……t n The size of the slurry is increased in turn so as to adapt to the falling time of the slurry.
Since different slurries have different requirements for the rotational speed of the first roller 3 during grinding, i.e. the rotational speed V at which the first roller 3 is maintained during continuous operation of the grinding mill 2 With different requirements, the deceleration coefficient C is set so that the lowest speed V of the first roller 3 can be set 1 And the highest speed V 2 Making a connection so that the lowest speed V is 1 It can also be matched with different slurries. Preferably, in order to improve the grinding efficiency and effect as much as possible on the premise of ensuring the quick start of the grinding mechanism, the value model of the deceleration coefficient is as follows:
wherein k is a proportional adjustment coefficient, the numerical value is set by a system, the unit is mm/s, the system is mainly used for adjusting the numerical value of each variable after the numerical value is calculated, and the specific value can be used for measuring the most appropriate lowest speed V of several kinds of slurry through experiments 1 And the highest speed V 2 Obtaining a plurality of k values and then averaging the k values;
s is the gap distance between the first roller 3 and the second roller 4, and the unit is mm; l is effective for the first roll 3Grinding length in mm; the value of S multiplied by L is the area of the gap through which the slurry can pass, and the larger the area is, the more the slurry can actively pass, so that the V can be increased 1 So sxl is positively correlated with the deceleration coefficient C;
tau is the viscosity of the slurry in mm 2 The greater the viscosity of the slurry, the less likely the slurry will pass through the gap, so τ is inversely related to the deceleration coefficient C;
r is the radius of the first roll 3 in mm, the second roll 4 has generally the same radius as the first roll 3, the larger the radius R, the greater the linear velocity of the surface of the first roll 3 at the same speed, and the more the speed reduction is required, so R is inversely related to the deceleration coefficient C;
i is the transmission ratio of the second roller 4 to the first roller 3, and the larger i indicates that the greater the difference between the rotation speeds of the second roller 4 and the first roller 3, the more the rotation speed needs to be reduced to make the rotation speeds of the second roller 4 and the first roller 3 close to each other, so that i is inversely related to the deceleration coefficient C.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A multi-layer double-roller grinding machine is characterized by comprising a machine frame (1) and a plurality of grinding mechanisms arranged from top to bottom in the machine frame (1);
wherein the top end of the frame (1) is provided with an opening;
each grinding mechanism comprises a power mechanism (2), a first roller (3), a second roller (4), a gap adjusting mechanism (5), a discharge hopper (6) and two scraping mechanisms (7); the power mechanism (2) drives the first roller (3) to rotate; the first roller (3) and the second roller (4) are horizontally arranged in a clearance mode, the first roller (3) is in transmission connection with the second roller (4), and the rotating speeds of the first roller (3) and the second roller (4) are different; the gap adjusting mechanism (5) is used for adjusting the gap between the first roller (3) and the second roller (4); the discharging hopper (6) is arranged below a gap between the first roller (3) and the second roller (4); the two scraping mechanisms (7) are respectively arranged at the bottom ends of the first roller (3) and the second roller (4) and are used for scraping the slurry on the first roller (3) and the second roller (4);
the power mechanism (2) comprises a variable frequency motor (21) and a speed reducer (22), and the variable frequency motor (21) drives the first roller (3) to rotate through the speed reducer (22);
the clearance adjusting mechanism (5) comprises a first shaft seat (51), a second shaft seat (52), a first telescopic rod (53), a fine adjustment shaft sleeve (54) and a rotating shaft (55); the first roller (3) and the second roller (4) rotate on the first axle seat (51) and the second axle seat (52), respectively; the bottom ends of the first shaft seat (51) and the second shaft seat (52) are respectively hinged with the frame (1); the top end of the first shaft seat (51) is hinged with one end of the first telescopic rod (53); the other end of the first telescopic rod (53) is hinged with one end of the fine adjustment shaft sleeve (54); the other end of the fine adjustment shaft sleeve (54) is provided with a threaded hole; one end of the rotating shaft (55) is rotatably arranged at the top end of the second shaft seat (52); the other end of the rotating shaft (55) is provided with threads and is screwed into the threaded hole; the clearance adjusting mechanism (5) further comprises a fine adjustment gear (56), a servo motor (57) and a planetary reducer (58); the fine adjustment gear (56) is fixedly sleeved on the rotating shaft (55); the servo motor (57) drives the fine adjustment gear (56) to rotate through the planetary reducer (58);
each scraping mechanism (7) comprises a fixed block (71), a rotating plate (72), a scraping plate (73) and a second telescopic rod (74); the fixed block (71) is fixedly arranged on the rack (1) and is provided with an installation groove; a rotating column is arranged on the side surface of the rotating plate (72) and extends into the mounting groove; the scraper (73) and the second telescopic rod (74) are arranged on two sides of the rotating column, the scraper (73) is fixedly arranged on one side, close to the first roller (3) or the second roller (4), of the rotating plate (72), and the moving end of the second telescopic rod (74) is abutted to the other side of the rotating plate (72); the mounting grooves comprise vertical grooves (75) and horizontal grooves (76); the top end of the vertical groove (75) is communicated with the top surface of the fixed block (71), the bottom end of the vertical groove is communicated with one end of the horizontal groove (76), and the other end of the horizontal groove (76) extends towards the first roller (3) or the second roller (4); the rotating column is positioned at one end of the horizontal groove (76) close to the first roller (3) or the second roller (4) after the installation is finished.
2. The multiroller double roll mill of claim 1, characterized in that each of said grinding means further comprises leakproof means (8) arranged at both ends of the gap between said first roll (3) and said second roll (4); leak protection mechanism (8) set up baffle (81), baffle (81) both sides support respectively first roller (3) with the top side of second roller (4), just the bottom downwardly extending of baffle (81) is in the clearance.
3. The multi-tier double-roll grinder of claim 2, wherein each of the grinding mechanisms further comprises a pushing mechanism (82); mounting ends are arranged at two ends of the first roller (3) and the second roller (4), and the diameters of the mounting ends are smaller than the middle sections of the first roller (3) and the second roller (4); the baffle (81) is arranged at the mounting end, and the pushing mechanism (82) is used for enabling the side surface of the baffle (81) to be always attached to the end surfaces of the middle sections of the first roller (3) and the second roller (4).
4. A control method of a multi-layer double-roller grinder, which is applied to the multi-layer double-roller grinder as set forth in any one of claims 1 to 3, characterized in that:
the plurality of grinding mechanisms are sequentially marked as a 1 st grinding mechanism and a 2 nd grinding mechanism … … nth grinding mechanism from top to bottom; wherein n is a positive integer; then there are:
before the slurry is poured, the first rollers (3) of all the grinding mechanisms are kept at V 1 A rotational speed;
after the slurry is poured, the first roller (3) of the 1 st grinding mechanism is at V 1 Rotational speed t 1 Gradually increasing to V after time 2 A rotational speed; the first roller (3) of the 2 nd grinding mechanism is at V 1 Rotational speed t 2 Gradually increasing to V after time 2 A rotational speed; … … n grinding mechanism has a first roller (3) at V 1 Rotational speed t n Gradually increasing to V after time 2 A rotational speed;
t 1 、t 2 ……t n the numerical value of (2) is increased in sequence;
V 1 rotational speed and V 2 The relationship of the rotation speed is as follows:
V 1 =C×V 2
wherein, V 1 And V 2 The units are the same; c is a deceleration coefficient, and is related to the transmission ratio of the second roller (4) to the first roller (3), the viscosity of the slurry and the radius of the first roller (3); the value model of the deceleration coefficient C is as follows:
wherein k is a proportional adjustment coefficient, the numerical value is set by a system, and the unit is mm/s; s is the clearance distance between the first roller (3) and the second roller (4), and the unit is mm; l is the effective grinding length of the first roller (3) and is in mm; tau is the viscosity of the slurry in mm 2 S; r is the radius of the first roller (3) and the unit is mm; i is the transmission ratio of the second roller (4) to the first roller (3).
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