CN105855030A - Electro-magnetic vibrating and screening and returning device of ceramic raw material roller mill - Google Patents

Abstract

The invention discloses an electromagnetic vibrating screening and returning device for a ceramic raw material roller mill, which is characterized in that it includes a material trough arranged on the outer edge of the grinding disc of the roller mill, a base and a vibration generator connected between the material trough and the base Device, the trough is provided with a spiral upward inclined material plate, the inclined material plate divides the material trough into upper and lower layers, and the inclined material plate is provided with several holes for installing screens and/or holes for convenient blanking , the lower cavity is provided with a discharge port, and the sieved raw material particles fall to the bottom plate of the lower cavity of the trough; the upper layer of the trough is provided with one or more discharge chutes leading to the roller mill track, At least one discharge opening is arranged on the discharge chute. The invention adopts electromagnetic force to work, has no rotating parts, does not need lubrication, is convenient to adjust the feeding amount, and is easy to realize automatic control.

Description

Electromagnetic Vibration Screening and Returning Device for Ceramic Raw Roller Mill

technical field

The invention relates to the technical field of ceramic machinery, in particular to a screening and returning device for roller mill equipment used for processing ceramic raw materials.

Background technique

In the production process of ceramic products, the preparation of raw materials is a very important link. The traditional process is: as shown in Figure 1, use a jaw crusher to process coarse and hard sand and gravel into coarse materials with a particle size of less than 15mm. The feeder is sent to the ball mill for grinding, and the ball milling time is as long as 12-16 hours, which has low efficiency, high power consumption, and high material consumption such as ball stones and ball linings. In recent years, roller mills have been widely used in cement, coal, mining and other industries. Because of their high grinding efficiency, energy saving and consumption reduction, they have been used in the ceramic industry. The new process is: as shown in Figure 2, the coarse and hard sand and stone with a particle size of less than 60mm are sent to the roller mill, and after grinding, the coarse material with a particle size of less than 2mm and uniform particle size is obtained by screening, and then sent to the ball mill for further processing. Grinding can save 40-55% of ball milling time, and about 42% of material consumption such as ball stones and ball linings, which greatly reduces production costs and improves production efficiency.

The structure and working principle of the roller mill are: as shown in Figure 3 (a), the driving part 1 is composed of a main motor and a reduction transmission part, which drives the grinding disc 2 to rotate, and the coarse ceramic raw material (coarse hard sand and stone, the particle size is less than 60mm ) from the feed pipe 3 into the central position of the grinding disc 2, the rotation of the grinding disc 2 gives the coarse raw material an outward centrifugal force, thereby slowly moving to the outer edge of the grinding disc and gradually entering the roller grinding track 4, the material layer on the grinding disc 2 makes the roller 5 obtains frictional force and rotates itself, and the coarse raw material continuously enters between the roller 5 and the grinding disc 2 and is rolled. The hydraulic device exerts tension on the grinding roller part 7 through the tension cylinder 6, so that the roller obtains a positive pressure against the rough raw material. The shear force is further crushed by rolling.

Centrifugal force makes the rolled raw material particles continue to move to the edge of the grinding disc 2, and fly out with a high linear velocity, and fall into the annular trough 8, as shown in Figure 3(b), the rotary scraper 9 is in contact with the grinding disc 2 connected and rotated together, the raw material particles 10 in the annular trough 8 are scraped to the discharge port, sent to the screening system by the conveyor belt and screened, and can pass through the 10-mesh screen to reach the required fine raw material particles (particle size ≤2mm) is sent to the ball mill by the belt conveyor for further grinding, and the coarse particles that cannot pass through are sent back to the roller mill by the belt conveyor for further grinding. Although the efficiency of the roller mill plus ball mill process is improved and the loss is reduced, it needs to be screened outside the roller mill, which makes the production line long, the equipment investment is large, and the power consumption and loss of the screening system are relatively large.

Contents of the invention

The purpose of the present invention is to solve the deficiencies of the prior art and provide a ceramic raw material roller mill with electromagnetic vibration that is simple in structure, can shorten the process, improve production efficiency, reduce equipment investment, and save power consumption and material consumption in the screening process. Screening return device.

The present invention adopts the following technical solution to achieve the above object: an electromagnetic vibrating screening device for ceramic raw material roller mill, characterized in that it includes a trough arranged on the outer edge of the grinding disc of the roller mill, a base and a The vibration generating device between the trough and the base, the trough is provided with a spiral upward inclined material partition, and the inclined material partition divides the trough into upper and lower layers. There are a number of holes for installing screens and/or holes for raw material particles to fall on the inclined material plate. The raw material particles passing through the screen fall to the bottom of the lower chamber of the trough, and move toward the bottom of the bottom under the action of electromagnetic vibration. The discharge port moves, and finally flows out from the discharge pipe, and is sent to the ball mill through the conveyor belt to continue grinding; the raw material particles that cannot pass through the screen move to the discharge chute along the inclined material plate and the surface of the screen under the action of electromagnetic vibration , the outlet of the discharge chute leads to the roller mill track, and is blown into the millstone under the action of compressed air to continue to be ground.

As a further description of the above scheme, the trough includes a base plate and an inner plate and an outer plate that are separately arranged on the inner and outer sides of the base plate, and the inner plate is 5-10 mm away from the outer edge of the grinding disc; the outer plate of the chute is 5 mm away from the roller mill cover plate -10mm, there is a rubber seal between the roller mill cover plate and the outer plate to prevent particles from leaking from the gap.

The trough is an integrated annular trough, or a complete annular trough composed of multi-section trough components. The inclined material plate spirals up in an arc shape, and the inclined material plate and the inner and outer plates Welded together, the inclination angle to the horizontal plane is 6°-10°.

Preferably, the structure of each section of the chute assembly is in the shape of a 1/8 ring, and there are eight sections of chute assemblies evenly distributed along the circumference of the outer edge of the grinding disc, and the heads and tails of the adjacent two sections of the chute assemblies are connected and overlapped part, forming a 360-degree complete ring, which can ensure that the raw material particles fall on the trough of the device.

The overlapping distance between the head and the tail of the two adjacent trough assemblies is 10-20mm.

Preferably, the sieve belt of the inclined material plate is provided with a square hole, and a 5-15 mesh screen is laid on the inclined material plate, so that the raw material particles passing through the screen fall from the square hole on the inclined material plate. The bottom plate of the lower chamber of the trough.

One or more intermediate material plates are arranged in the trough, and one or more intermediate material plates divide the material trough into several sections, the purpose is to make the particles move on the inclined material plate to the distance of the discharge port. shortening; each section has at least one discharge chute, one end of the discharge chute is provided with a blowing port, and the blowing port is connected with a trachea or an air nozzle, and the intermittently blown compressed air is blown into the grinding disc to continue to be ground.

The vibration generating device includes upper and lower support plates, an elastic system connected between the upper and lower support plates, and an excitation device, and the material trough is fixed on the upper support plate.

The elastic system includes two sets of leaf springs stacked as a group and a fixed seat connected between the leaf springs and the upper and lower support plates. The installation inclination angle of the leaf springs is 20-25 degrees. The fixing seat is installed on the upper support plate and the lower support plate with screws.

The excitation device includes an iron core coil, an armature and a wedge, the armature is fixed on the upper support plate, the iron core coil is installed on the lower support plate through the wedge, and the wedge is provided with an adjusting screw for adjusting the extension of the wedge Length, so as to adjust the gap between the armature and the core.

The armature is formed by stacking in-line silicon steel sheets of 0.23-0.50 mm; the iron core is stacked of mountain-shaped silicon steel sheets of 0.23-0.50 mm.

There are a plurality of rubber damping columns on the bottom surface of the lower support plate, which play the role of vibration isolation for the roller mill frame.

The beneficial effect that the present invention can reach by adopting above-mentioned technical solution is:

1. The present invention adopts the form of adding a trough and an electromagnetic vibration screening device on the outer edge of the grinding disc of the roller mill. The raw material particles after the roller mill are directly in the roller mill to complete the screening and return the coarse material to the grinding disc, eliminating the need for Screening equipment and belt conveyor shorten the process, reduce equipment, improve production efficiency, and reduce power consumption and material consumption in the screening process.

2. When the material layer of the present invention is sieved and moved, the movement of the particles jumps forward according to the parabolic trajectory, and the wear on the screen and the trough is small; and the entire feeding process relies on electromagnetic force, no rotating parts, no lubrication, It is convenient to adjust the feeding amount, and it is easy to realize automatic control.

Description of drawings

Fig. 1 is the production process flowchart of known crusher adding ball mill;

Fig. 2 is the production process flowchart of known roller mill plus ball mill;

Fig. 3 (a) is a known three-dimensional structural diagram of a roller mill;

Fig. 3 (b) is the schematic diagram of roller mill;

Fig. 4 is the installation diagram of the electromagnetic vibrating screening feeding device of the present invention on the roller mill;

Fig. 5 is the schematic diagram that the electromagnetic vibrating screening return device of the present invention is assembled into a whole;

Figure 6 is a top view of Figure 7;

Fig. 7 is the main cross-sectional view of the electromagnetic vibrating screening return device of the present invention;

Fig. 8 is the B-B direction sectional view of Fig. 7;

Fig. 9 is a C-C sectional view of Fig. 7;

Fig. 10 is a schematic diagram of the electromagnetic vibration of the present invention.

Explanation of reference numerals: 1. Driving component 2, grinding disc 3, feeding pipe 4, roller grinding track 5, roller wheel 6, tension cylinder 7, grinding roller component 8, annular trough 9, rotary scraper 10, raw material particles 11. Feed trough 11-1, upper layer 11-2 of feed trough, lower cavity 11-3, bottom plate 11-4, inner plate 11-5, outer plate 11-6, inclined partition plate 11-7, screen

11-8, discharge chute 11-9, air pipe or air nozzle 11-10, intermediate material plate 12, base 13, vibration generating device 13-1, upper support plate 13-2, lower support plate 13-3, Elastic system 13-31, plate spring group 13-32, fixed seat 13-33, screw 13-4, vibration excitation device 13-41, iron core coil 13-42, armature 13-43, wedge 13-44, adjustment Screw 13-5, rubber damping column 14, roller mill cover plate 15, rubber seal.

detailed description

In order to facilitate those skilled in the art to better understand the essence of the present invention, the specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

Example 1

As shown in Fig. 4-Fig. 10, the present invention is a kind of ceramic raw material roller mill electromagnetic vibrating screening return device, and it comprises the hopper 11 that is arranged on the outside of roller mill grinding disc 2, base 12 and is connected with hopper and The vibration generating device 13 between the bases is provided with an inclined upward inclined material partition 11-6 in the feed tank 11, and the inclined material partition 11-6 divides the feed tank into upper and lower layers 11-1, 11-2. The material plate 11-6 is provided with several hole positions for installing screens. In the present embodiment, there are several square holes for the raw material particles to fall on the inclined material plate 11-6, and on the inclined material plate 11-6 A 10-mesh screen 11-7 is installed above, and the raw material particles passing through the screen 11-7 fall onto the bottom plate of the lower chamber 11-2 of the trough, and move to the discharge port of the bottom plate under the action of electromagnetic vibration, and finally from the The discharge pipe flows out and is sent to the ball mill through the conveyor belt to continue grinding; the raw material particles that cannot pass through the screen move to the discharge chute 11-8 along the inclined partition plate 11-6 and the surface of the screen under the action of electromagnetic vibration, The outlet of the discharge chute is led to the roller grinding track, and under the action of compressed air, it is blown into the grinding disc to continue to be ground.

Feed trough 11 comprises base plate 11-3 and is located at the inner side plate 11-4 of base plate inner and outer sides and outer side plate 11-5 respectively, and the board height of outer side plate will be greater than inner side plate, and inner side plate 11-4 is apart from millstone 2 outer edges 5- 10mm; the outer plate 11-5 of feed trough 11 is 5-10mm apart from the roller mill cover plate 14, and there is a rubber seal 15 between the roller mill cover plate and the outer plate to prevent particles from leaking from the gap. Wherein, the material chute 11 is an annular trough made up of multi-section material chute assemblies, each section of material chute assembly is in the shape of a 1/8 ring, and there are eight sections of material chute assemblies evenly distributed along the circumference of the outer edge of the grinding disc. The head and the tail of the two sections of feed chute assembly are connected and have an overlapping portion of 15mm, which can ensure that the raw material particles all fall on the feed chute 11 of the device. The oblique material partition 11-6 spirally rises in an arc shape, and the oblique material partition 11-6 is welded together with the inner and outer side plates 11-4, 11-5, and the inclination angle with the horizontal plane is 6°-10°.

As shown in Figure 7, a middle partition 11-10 is arranged in the trough 11, and the middle partition 11-10 divides the trough into two sections, the purpose is to make the particles move to the discharge port on the inclined partition The distance is shortened; each section has at least one discharge chute 11-8, one end of the discharge chute is provided with a blowing port, and the blowing port is connected with a trachea or an air nozzle 11-9, and the compressed air blown out intermittently blows the raw material particles quickly Blow into the grinding disc to continue to be ground, see Figure 9.

As shown in Figure 10, the vibration generating device 13 comprises upper and lower support plates 13-1, 13-2, an elastic system 13-3 connected between the upper and lower support plates, an excitation device 13-4, and a trough 11 Be fixed on the upper support plate 13-1. The elastic system 13-3 comprises 6 sets of leaf spring groups 13-31 stacked up by two or more leaf springs and a fixed seat 13-32 connected between the leaf springs and the upper and lower support plates. Made with 60Si2Mn or 60Si2A material, the installation inclination angle of leaf spring is 20-25 degree, and holder 13-32 is installed on upper support plate 13-1, lower support plate 13-2 with screw 13-33. The excitation device 13-4 includes an iron core coil 13-41, an armature 13-42 and a wedge 13-43, the armature 13-43 is fixed on the upper support plate 13-1, and the iron core coil is installed on the lower support plate 13 through the wedge On -2, the wedge is provided with an adjusting screw 13-44, which is used to adjust the protruding length of the wedge, thereby adjusting the gap between the armature and the iron core. The armature is formed by stacking 0.23-0.50mm in-line silicon steel sheets; the iron core is stacked by 0.23-0.50mm mountain-shaped silicon steel sheets. There are 6 or more than 6 rubber damping columns 13-5 on the bottom surface of the lower support plate, which play the vibration isolation effect to the roller mill frame.

The following is the working principle of the vibration generating device. The unidirectional pulsating current after half-wave rectification passes through the coil, and the current passes through the coil in the positive half cycle. The iron core generates a pulse electromagnetic force to attract the armature, and the plate spring is affected by the electromagnetic force. Deformation, a certain potential energy is stored, no current passes through the coil in the negative half cycle, the electromagnetic force disappears, and the leaf spring recovers to deform, forming a forced vibration system with electromagnetic force as the periodic interference force.

The armature is installed on the upper support plate, so it drives the trough to move downward under the action of electromagnetic attraction, the position shown by the double dotted line in the figure. When the electromagnetic force disappears, under the action of the elastic force of the six sets of leaf springs distributed along the circular arc, a torsional parabolic upward movement is generated from left to right, returning to the position of the solid line in the figure, and falling on the inclined partition plate and the screen. The raw material particles with a particle size of less than 2mm pass through the screen and the large holes on the inclined material plate, and fall into the bottom plate of the lower layer of the hopper, which is equivalent to the function of a vibrating screen, and the remaining materials remain on the screen. Under the combined effect of inertial force, gravity and frictional force, the fine particles in the lower layer perform a helical parabolic motion from left to right. The fine material in the lower layer flows to the discharge port, and the coarse material in the upper layer flows to the discharge trough plate.

By changing the input current of the electromagnet coil, the amplitude of the material tank can be adjusted, and then the feeding rate of the device can be adjusted. Adjusting the protruding length of the wedge can change the gap between the iron core and the armature, and the vibration isolation column plays the role of isolating the vibration of the roller mill frame.

During the roller grinding process of ceramic raw materials, the raw material particles after being rolled move to the edge of the grinding disc due to the centrifugal force, and fly out along the radial direction of the grinding disc with a relatively high linear velocity, and fall into the inclined partition plate and the trough of the device of the present invention. On the screen, under the action of electromagnetic vibration, the fine particles fall through the screen and the square holes on the inclined material plate to the bottom plate of the trough, and move forward in a parabolic motion until they reach the discharge port, and flow out through the discharge pipe to become Finished product; the coarse particles left on the slanted material plate and the screen also do a parabolic motion forward, and move to the discharge trough plate, and the compressed air blown intermittently by the air pipe is blown into the grinding disc to continue to be ground.

Example 2

The difference between this embodiment and Embodiment 1 is that the trough is an annular trough composed of 8 sections of chute components, and each section of the trough component is in the shape of a 1/8 ring, and is evenly distributed along the circumference of the outer edge of the grinding disc. distributed.

It is worth noting that the material trough can also be set as a welded one-piece circular ring-shaped trough.

Compared with the prior art, the present invention has the main distinguishing technical feature that the raw material particles after roller milling are directly in the roller mill, and the screening and coarse material return to the grinding table are completed, eliminating the need for screening equipment and belt conveyors , shorten the process, reduce equipment, improve production efficiency, reduce power consumption and material consumption in the screening process, and have significant progress.

When the material layer is sieved and moved, the movement of the particles jumps forward according to the parabolic trajectory, which has little wear on the screen and the trough; the electromagnetic force has no rotating parts, no lubrication, and it is convenient to adjust the feeding amount, and it is easy to realize automatic control. Unexpected technical effects.

The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, without departing from the inventive concept of the present invention, some modifications and improvements can also be made, and these all belong to the present invention. protection scope of the invention.

Claims (10)

1. a ceramic raw material roller mill electromagnetic vibrating screening device is characterized in that it comprises a hopper arranged on the outer edge of the roller mill grinding disc, a base and a vibration generating device connected between the hopper and the base, The trough is provided with a spiral upward inclined material plate, which divides the material trough into an upper layer and a lower layer. The inclined material plate is provided with a number of holes for installing screens and/or holes for easy feeding. The lower layer The cavity is provided with a discharge port, and the sieved raw material particles fall from the bottom plate of the lower chamber of the trough; the upper layer of the trough is provided with one or more discharge chutes leading to the roller mill track. At least one discharge opening is arranged on the material chute. 2. The electromagnetic vibrating screening return device of ceramic raw material roller mill according to claim 1, characterized in that, the trough comprises a base plate and an inner plate and an outer plate which are respectively arranged on the inner and outer sides of the base plate, and the inner plate and the outer plate of the grinding disc The distance between the edges is 5-10mm; the distance between the outer plate of the trough and the cover plate of the roller mill is 5-10mm and there is a sealing rubber plate. 3. The electromagnetic vibrating screening device for ceramic raw material roller mill according to claim 1, characterized in that, the feed tank is an integrated annular groove or an annular groove composed of multi-section material groove components , The oblique material plate spirals up in the shape of an arc, and the oblique material plate is welded together with the inner and outer plates, and the inclination angle with the horizontal plane is 6°-10°. 4. The electromagnetic vibrating screening device for ceramic raw material roller mill according to claim 3, characterized in that, each section of the material device is in the shape of a 1/8 ring, and is evenly distributed along the circumference of the outer edge of the grinding disc. Two adjacent sections are connected head to tail and have overlapped parts to form a 360-degree complete ring, which can ensure that the raw material particles fall on the trough of the device. 5 . The electromagnetic vibrating screening device for ceramic raw material roller mill according to claim 4 , wherein the overlapping distance between the head and the tail of the two adjacent trough assemblies is 10-20 mm. 5 . 6. The ceramic raw material roller mill electromagnetic vibration screening return device according to claim 1 is characterized in that, a square hole is arranged on the inclined material plate, and a 5-15 mesh screen is laid on it, The particles passing through the screen fall from the square hole on the inclined material plate to the bottom plate of the lower chamber of the chute. 7. The ceramic raw material roller mill electromagnetic vibration screening and feeding device according to claim 1 is characterized in that, one or more than one intermediate material plates are arranged in the trough, and the trough is divided into several sections, The purpose is to shorten the moving distance of the particles on the inclined material plate; each section has at least one discharge chute, and one end of the discharge chute is provided with a blowing port connected with a trachea. 8. The electromagnetic vibrating screening device for ceramic raw material roller mill according to claim 1, characterized in that, the vibration generating device comprises upper and lower support plates, an elastic system connected between the upper and lower support plates , Vibration device, the trough is fixed on the upper support plate. 9. The electromagnetic vibrating screening return device for ceramic raw material roller mill according to claim 8, characterized in that, the elastic system comprises a plurality of sets of leaf springs composed of more than two leaf springs stacked together as a group and Be connected to the fixed seat between the leaf spring and the upper and lower support plates, the installation inclination angle of the leaf spring is 20-25 degrees, and the fixed seat is installed on the upper support plate and the lower support plate with screws. 10. The electromagnetic vibrating screening and returning device for ceramic raw material roller mill according to claim 8, characterized in that, the excitation device comprises an iron core coil, an armature and a wedge, the armature is fixed on the upper support plate, and the iron The core coil is installed on the lower support plate through a wedge, and the wedge is provided with an adjusting screw for adjusting the protruding length of the wedge, thereby adjusting the gap between the armature and the iron core; The armature is formed by stacking in-line silicon steel sheets of 0.23-0.50 mm; the iron core is stacked of mountain-shaped silicon steel sheets of 0.23-0.50 mm; There are a plurality of rubber damping columns on the bottom surface of the lower support plate, which play the role of vibration isolation for the roller mill frame.