CN104668044B - Cross roll pressurization outer circulation flour mill - Google Patents

Abstract

The invention discloses a powder mill with inclined roller pressurization and external circulation. The bottom of the base of the main machine is equipped with a central shaft frame, the upper part of the base is equipped with a grinding ring, the end face of the base is equipped with a cover tube, the lower part of the main shaft is installed in the central shaft frame, and the upper part of the main shaft is equipped with a grinding wheel. Roller device, grinding roller device includes grinding roller frame and grinding roller, the circumference of the grinding roller frame is uniformly arranged on the fixed roller frame and inclined outward and downward, and the grinding roller is installed on the grinding roller frame and against the upper and lower sides of the grinding ring On the small conical grinding surface, the fixed roller frame is installed on the upper end of the main shaft, and a coaxially rotating uniform material plate is arranged above the fixed roller frame; A scraper is installed at the bottom, and the scraper is evenly distributed on the circumference of the scraper frame. The scraper frame and the fixed roller frame are coaxially fixed, and the discharge port of the main machine is connected to the external classification system. The invention has the advantages of simple structure, low cost, easy maintenance, and short replacement and maintenance time; the loss of total power is greatly reduced because there is no blade throwing action and heavy grinding roller device.

Description

Inclined Roller Pressurized External Circulation Mill

(1) Technical field:

The invention relates to powder processing equipment, in particular to a skew roller pressurized external circulation pulverizer.

(two) background technology:

Grinding machine is the most widely used equipment in mineral powder industry.

The general structure of a main engine of a mill is as follows: the base of the main engine is equipped with a hollow central shaft frame, a coaxial grinding ring and a cover cylinder. The upper end of the main shaft outside the frame is equipped with a fixed roller frame (or called plum blossom frame), and the grinding roller assemblies distributed in the circumference are set on the fixed roller frame; during the revolution process of the grinding roller assembly, the grinding roller assembly is driven by centrifugal force. Each grinding roller keeps rolling contact with the grinding ring, and the mutual rolling between the grinding roller and the grinding ring crushes the mineral material. Under the negative pressure of the system, the suspended mineral powder is classified by the classifier, and the qualified mineral powder is passed through The classifier conveys to the collector, and the unqualified ore powder falls back to the bottom of the base of the main machine.

The mineral material at the bottom of the main machine base is conveyed to the rolling area between the grinding roller and the grinding ring, which is mainly realized by the rotation of the shovel driven by the shovel holder. During the rotation, the shovel throws the mineral material obliquely upward to the corresponding Set between the grinding roller and the grinding ring.

In the process of throwing ore on the shovel, the deposited ore produces resistance to the shovel, and the shovel overcomes the resistance of the ore to do work, which is bound to consume part of the power of the main engine. This is because the output per unit time of this type of mill is not high. , One of the reasons for low efficiency.

(3) Contents of the invention:

Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is to propose a skewed roller pressurized external circulation mill for the purpose of improving processing efficiency.

The oblique roller pressurized external circulation mill that can solve the above technical problems includes a milling host, a central shaft frame is installed at the bottom of the inner hole of the base of the milling host, a grinding ring is installed on the upper part of the inner hole of the base, and a grinding ring is installed on the end surface of the base. The cover tube, the feed port of the main machine is opened on the upper cover of the cover tube, the lower part of the main shaft of the main machine is installed in the central shaft frame through the bearing structure and extends downwards to connect the transmission mechanism, and the grinding roller device of the main machine is installed on the main shaft of the main machine. The grinding roller device includes a fixed roller frame, a grinding roller frame and a grinding roller. The grinding roller shaft is installed on the grinding roller frame and abuts against the large and small conical grinding surface of the grinding ring (the oblique angle of the grinding roller frame is the same as the cone angle of the conical grinding surface), the fixed roller The frame is installed on the upper end of the main shaft of the main machine, and a coaxially rotating uniform material plate is arranged above the fixed roller frame; the main machine discharge port is set at the bottom of the inner hole of the base beside the central shaft frame, corresponding to the main machine discharge port at the bottom of the inner hole of the base The scraper is installed, and the scraper is evenly distributed on the circumference of the scraper frame. The scraper frame is coaxially set on the central shaft frame and its top is connected with the fixed roller frame. The outlet of the main engine is connected through a pipeline. External classification system; the external classification system includes a classification elevator, a classifier and a cyclone separator. Above, the inlet of the grading elevator is connected to the outlet of the main engine through the pipeline, and the outlet of the grading elevator is connected to the inlet of the classifier through the pipeline, and the qualified products of the classifier enter the cyclone separator through the pipeline The unqualified products of the classifier are collected and returned to the main machine for re-grinding through the feeding port of the main machine.

In the above structure, the raw material enters the main mill through the feeding port, and is evenly distributed by the material disc and falls into the conical grinding surface of the grinding ring (the conical grinding surface increases the grinding area, and the weight component of the grinding roller acts The grinding force is added to the grinding ring) for grinding, and the ground material falls to the bottom of the inner hole of the base, is brought to the discharge port of the main machine by the scraper and falls into the external classification system for classification.

The grinding rollers can be erected at the same height position on the fixed roller frame, and then the grinding rollers are at the same height to become a single-layer roller; or the grinding rollers can be erected at different positions on the fixed roller frame, then the grinding rollers There are more than two layers of rollers with different heights.

Conventionally, the grinding roll stand is fixed at the upper and lower positions on the fixed roll stand to form two layers of rollers with upper and lower dislocations.

A structure that allows the grinding roller to have the oblique degree of freedom is: the grinding roller frame is a double-layer parallel four-bar linkage mechanism, and the hinge points opposite to the parallel four-bar linkage mechanism respectively hinge the fixed roller frame and the grinding roller Grinding roller shaft, the fixed roller frame is provided with a booster mechanism that applies force to the grinding roller to increase the grinding force, and the booster mechanism includes a folded booster rod, a booster block, a booster plate, a compression spring and a hydraulic oil cylinder or air cylinder, the hydraulic oil cylinder or air cylinder is set at the center of the top of the fixed roll frame, the said force plate is coaxially set on the piston rod protruding upward from the hydraulic oil cylinder or air cylinder, and the folded force force rod corresponds to The circumference of each grinding roller is evenly distributed, and the folded part of each folded booster rod is hinged, and the compression spring is pressed between the inner end of the inner transverse rod of the folded booster rod and the plate body of the corresponding part of the booster plate , in order to balance the pressure, the spring force adjustment assembly for adjusting the spring pressure is arranged on the booster plate, and the booster block perpendicular to the direction of the degree of freedom is placed obliquely in the corresponding double-layer parallel four-bar linkage mechanism, and the booster The upper and lower ends of the block exceed the double-layer parallel four-bar linkage mechanism, the upper end of the booster block is connected to the bottom end of the vertical rod outside the folded booster rod, and the upper and lower ends of the grinding roller exceed the double-layer parallel four-link mechanism. The rod mechanism is respectively clamped on the bottom of the clamping groove opened on the outwardly extending parts of the upper and lower ends of the force block, and the direction of the clamping groove is the same as the direction of the degree of freedom. In the above structure, the force applying mechanism acts downward on the inner end of the horizontal bar of the folded afterburner rod (equivalent to the active end of the lever), and the bottom of the vertical rod body of the folded afterburner rod (equivalent to the driven end of the lever) end) to drive the booster block to push the grinding roller on the grinding ring, so as to increase the grinding force of the grinding roller on the grinding ring; the setting of the hydraulic oil cylinder or air cylinder is to facilitate the grinding force for processing different materials adjust.

A rib is provided on the peripheral edge of the uniform material disc to prevent the material from being thrown out due to centrifugal force and hitting the cover tube to generate noise.

Beneficial effects of the present invention:

1. The oblique roller pressurized external circulation pulverizer of the present invention adopts external circulation to separate finished products, the energy consumption loss of the exhaust fan is small, and the equipment maintenance is convenient.

2. There is no spatula in the structure of the present invention, because there is no action of throwing material, the power consumption is reduced, and the total power loss of the main mill is greatly reduced.

3. In the structure of the present invention, there is no material throwing action due to the lack of a shovel mechanism, that is, there will be no jamming or crashing of the machine due to hard iron ore and scattered iron pieces.

4. The present invention adopts inclined rollers to grind materials, which realizes the simultaneous output of gravity and centrifugal force of inclined rollers, and improves the grinding efficiency.

5. The present invention adds a booster mechanism to facilitate the adjustment of the grinding force for processing different materials.

6. The outer edge of the material equalizing plate of the present invention is provided with a material retaining edge, so that the material will not be thrown out and hit the cover cylinder due to centrifugal force to generate noise, and the material will be evenly sprinkled on the grinding area, and the distribution is more reasonable.

7. The invention has the advantages of simple structure, low cost and easy manufacturing and processing, and is the preferred equipment for a new generation of milling machines.

(4) Description of drawings:

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a top view of the embodiment of Fig. 1 .

Fig. 3 is a schematic structural view of the milling host in the embodiment shown in Fig. 1 and Fig. 2 .

Fig. 4 is a view along the direction A in Fig. 3 .

Drawing number identification: 1. Mill main engine; 2 Base; 3. Central shaft frame; 4. Grinding ring; 5. Cover tube; 6. Main engine feeding port; 7. Upper cover; Frame; 10. Grinding roller; 11. Fixed roller frame; 12. Material bin; 13. Evening tray; 14. Main engine outlet; 15. Scraper plate; 16. Scraper rack; 17. Grading hoist; 18 , folded booster rod; 19. classifier; 20. cyclone separator; 21. coupling; 22. fan; 23. booster block; 24. booster plate; 25. compression spring; 26. hydraulic cylinder; 27, card slot; 28, collecting hopper; 29, collecting box.

(5) Specific implementation methods:

The technical solutions of the present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

The oblique roller pressurized external circulation pulverizer of the present invention comprises a pulverizing host 1 and an external grading system.

The base 2 of the milling host 1 is fixed on the concrete base, the bottom of the inner hole of the base 2 is coaxially equipped with a hollow central shaft frame 3, and the upper part of the inner hole of the base 2 is coaxially installed with a grinding ring 4, and the grinding ring 4 The grinding surface is a tapered grinding surface with a large top and a small bottom. A cover tube 5 is coaxially installed on the end surface of the base 2. The cover tube 5 is sealed by a top cover 7, and a main engine feeder is provided at the center of the top cover 7. The material port 6; the lower part of the main shaft 8 of the milling host 1 is installed in the central shaft frame 3 through the upper and lower bearing structures, and the lower end of the main shaft 8 protrudes from the central shaft frame 3 and is connected to the shaft driven by the motor through the coupling 21. The reducer, the grinding roller device of the grinding host 1 is installed on the top of the main shaft 8 (the part protruding from the central shaft frame 3 ) through the fixed roller frame 11; The bottom is opened, and the scraper 15 is used to scrape the material. The scraper 15 is evenly distributed on the bottom of the scraper frame 16 in the base 2. The scraper frame 16 is coaxial with the central shaft frame 3. , the top of the scraper frame 16 is coaxially fixed with the fixed roller frame 11, and the external classification system is connected to the discharge port 14 of the main machine through a pipeline; a coaxially rotating uniform material plate 13 is installed above the fixed roller frame 11 through a bracket , The circumferential edge of the uniform material tray 13 is provided with ribs, as shown in FIG. 3 .

The grinding roller device includes a grinding roller frame 9 and a grinding roller 10. The circumference of the grinding roller frame 9 is uniformly arranged on the fixed roller frame 11 and is arranged obliquely outward and downward. The grinding roller frame 9 is installed on and abuts against the large and small conical grinding surface of the grinding ring 4. The oblique angle of the grinding roller frame 9 is the same as the cone angle of the conical grinding surface. In the grinding roller device, The grinding roller 10 has the function of free movement in the oblique direction, as shown in FIG. 3 .

The grinding roller stand 9 of the described grinding roller device is fixed at the same height position on the fixed roller stand 11, then a plurality of grinding rollers 10 are on the same level to form a single-layer roller, or the grinding roller stand 9 of the described grinding roller device Fixed at the upper and lower height positions of the fixed roller stand 11, half of the grinding rollers 10 are on the upper level and obliquely against the upper conical grinding surface of the grinding ring 4, and the other half of the grinding rollers 10 are on the lower level and The grinding rollers 10 of the upper and lower layers form a double-layer roller structure and are staggered in position against the lower conical grinding surface of the grinding ring 4 obliquely.

The structural form that can make the grinding roller 10 have the oblique degree of freedom is:

The grinding roller frame 9 is an upper and lower double-layer parallel four-bar linkage mechanism, and the relative hinge points of the parallel four-bar linkage mechanism respectively hinge the fixed roller frame 11 and the grinding roller shaft of the grinding roller 10 .

During the grinding process, the structure can automatically compensate for the wear of the grinding roller 10, and can effectively avoid bulky materials in the grinding area.

In order to increase the grinding force, the fixed roller frame 11 is provided with a force-applying mechanism that pushes the grinding roller 10 along the oblique direction. Inboard transverse rod body and outside vertical rod body), booster block 23, booster plate 24, compression spring 25 and hydraulic oil cylinder 26, described hydraulic oil cylinder 26 is installed in the center of the top of fixed roll frame 11 below the uniform material tray 13 by the oil cylinder seat , the booster plate 24 is coaxially installed on the piston rod protruding upwards from the hydraulic cylinder 26, the folded booster rods 18 are evenly distributed on the circumference of each grinding roller 10, and the folded booster rods 18 are The shape part is hinged on the fixed roller frame 11, and the compression spring 25 is press-fitted between the inner end of the transverse bar body of the folded force bar 18 and the plate body of the corresponding part of the force plate 24, perpendicular to the direction of the degree of freedom The booster block 23 is obliquely placed in the corresponding double-layer parallel four-bar linkage mechanism (avoiding the grinding roller 10), and the upper and lower ends of the booster block 23 exceed the double-layer parallel four-bar linkage mechanism. The upper end is connected to the bottom end of the vertical rod body of the folded booster rod 18. The upper and lower ends of the grinding roller 10 exceed the double-layer parallel four-bar linkage mechanism and are respectively clamped on the upper and lower ends of the booster block 23 to extend outward. The bottom of the card slot 27 opened on the position, the direction of the card slot 27 is the same as the direction of the degree of freedom; due to the use of the force-adding mechanism of the structure, the grinding roller 10 produces additional pressure on the grinding ring 4, and the grinding When the main machine 1 is working, the additional pressure, the centrifugal force of the grinding roller 10 and the weight component of the grinding roller 10 are combined to form the grinding force between the grinding roller 10 and the grinding ring 4, as shown in Fig. 3 and Fig. 4 .

The discharge port 14 of the main machine is connected to the classification system outside the machine through pipelines.

The off-machine classification system includes a classification hoist 17, a classifier 19 and a cyclone separator 20, the classification hoist 17 is arranged on the left side of the mill main engine 1, and the cyclone separator 20 is arranged on the left side of the mill main engine 1. On the right side, the classifier 19 is installed above the main mill 1 through a frame, and the discharge port 14 of the main machine is connected to the feed port at the bottom of the classifying hoist 17 through a pipeline obliquely downward, and the top of the classifying hoist 17 is The discharge port is connected to the feed port of the classifier 19 through the pipeline inclined downward, the discharge port of the qualified product of the classifier 19 is connected to the feed port of the cyclone separator 20 through the horizontal pipeline, and the unqualified product of the classifier 19 passes through the set The hopper 28 flows back to the feed port 6 of the main machine, and the feed port 6 of the main machine is also connected to the discharge port of the feed bin 12 through an obliquely upward pipeline, as shown in Fig. 1 , Fig. 2 and Fig. 3 .

In the external classification system, the negative pressure of the classifier 19 and the cyclone separator 20 is generated by the fan 22, and the qualified powder of the classifier 19 is sent into the cyclone separator 20 for powder and gas separation, and the separated powder is the finished product , the finished product is collected in the collection box 29; the unqualified material of the classifier 19 settles in the collecting hopper 28 of the classifier 19, and flows back into the main machine 1 through the feeding port 6 of the main machine and continues to fall into the homogeneous material together with the raw materials introduced by the silo 12. On the disc 13 and evenly sprinkled to the grinding area for grinding, so that the cycle continues.

Claims (4)

1. Inclined roller pressurized external circulation mill, including a milling host (1), the base (2) of the milling host (1) is equipped with a central shaft frame (3) at the bottom of the inner hole, and the base (2) The grinding ring (4) is installed on the upper part of the inner hole, the cover cylinder (5) is installed on the end surface of the base (2), the main engine feeding port (6) is opened on the upper cover (7) of the cover cylinder (5), and the lower part of the main engine spindle (8) The bearing structure is installed in the central shaft frame (3) and extends downwards to connect the transmission mechanism. The grinding roller device of the milling main engine (1) is installed on the main machine main shaft (8), and the grinding roller device includes a fixed roller frame (11 ), grinding roller frame (9) and grinding roller (10), the circumference of said grinding roller frame (9) is evenly distributed on the fixed roller frame (11) and is arranged obliquely outward and downward, and the grinding roller with oblique degree of freedom (10) Install on the grinding roller frame (9) through the grinding roller shaft and abut against the large and small conical grinding surface of the grinding ring (4). The fixed roller frame (11) is installed on the main shaft (8) ) upper end, above the fixed roller stand (11) is provided with a coaxially rotating uniform material tray (13); the main engine discharge port (14) is set at the bottom of the inner hole of the base (2) next to the central shaft frame (3), Corresponding to the discharge port (14) of the main engine, a scraper (15) is arranged at the bottom of the inner hole of the base (2). The frame (16) is coaxially set on the central shaft frame (3) and its top is connected with the fixed roller frame (11), and the discharge port (14) of the main machine is connected with the external classification system through the pipeline; the external classification system includes Grading hoist (17), classifier (19) and cyclone separator (20), described grading hoist (17) and cyclone separator (20) are respectively arranged on both sides of the milling host (1), and the grading The machine (19) is arranged above the main machine (1) of the powder mill, and the feed port of the classifying hoist (17) is connected to the discharge port (14) of the main machine through a pipeline, and the discharge port of the classifying hoist (17) is connected through a pipeline. The feed port of the classifier (19), the qualified product of the classifier (19) enters the cyclone separator (20) to collect through the pipeline, and the unqualified product of the classifier (19) is refluxed through the feed port (6) of the main engine Re-grinding in the main mill (1) is characterized in that the structure that allows the grinding roller (10) to have the oblique degree of freedom is: the grinding roller frame (9) is a double-layer parallel four-bar linkage mechanism, so The relative hinge points of the parallel four-bar linkage mechanism respectively hinge the grinding roller shafts of the fixed roller frame (11) and the grinding roller (10). The adding force mechanism of the grinding force, the adding force mechanism includes a folded adding force rod (18), an adding force block (23), an adding force plate (24), a compression spring (25) and a hydraulic oil cylinder (26) or an air cylinder , the hydraulic cylinder (26) or the cylinder is arranged at the center of the top of the fixed roller frame (11), and the added force plate (24) is coaxially arranged on the hydraulic cylinder (26) or the piston rod protruding upward from the cylinder. The folded booster rods (18) are evenly distributed on the circumference of each grinding roller (10), and the folded parts of each folded booster rod (18) are hinged, and the compression springs (25) are press-fitted on the folded booster rods (18). Force bar (18 ) between the inner end of the inner transverse rod and the plate body at the corresponding position of the force plate (24), the force block (23) perpendicular to the direction of the oblique degree of freedom is obliquely placed in the corresponding double-layer parallel four-bar linkage mechanism Inside, the upper and lower ends of the booster block (23) exceed the double-layer parallel four-bar linkage mechanism, and the upper end of the booster block (23) is connected to the bottom end of the folded shape booster rod (18) outside vertical bar body, and the mill The upper and lower ends of the roller (10) exceed the double-layer parallel four-bar linkage mechanism and are respectively clamped in the bottom of the slot (27) opened on the outwardly extending part of the upper and lower ends of the force block (23). (27) The direction is the same as the direction of the oblique degree of freedom. 2. The oblique roller pressurized external circulation mill according to claim 1, characterized in that: the grinding roller frame (9) is set at the same height position on the fixed roller frame (11), and the grinding roller (10 ) at the same height to form a single-layer roll; or the grinding roll frame (9) is set at different positions on the fixed roll frame (11), and the grinding roll (10) is at different heights to form more than two layers of rolls. 3. The oblique roller pressurized external circulation mill according to claim 1, characterized in that: the grinding roller frame (9) is fixed on the upper and lower positions of the fixed roller frame (11) to form an upper and lower position. Lower misaligned two-layer rolls. 4. The inclined-roll pressurized external circulation mill according to any one of claims 1-3, characterized in that: the circumferential edge of the uniform material pan (13) is provided with ribs.