A raw meal grinding device for producing cement

Abstract

The utility model discloses a raw material grinding device for producing cement, including mill shell, the mill disc that sets up in the mill shell to and the air inlet of mill shell lower extreme and the air outlet of mill shell upper extreme, the middle part lateral wall of mill shell is provided with the feed inlet, sets up the feed pipe in the feed inlet, still is provided with the nozzle ring around the mill roller, sets up the air intake adjusting mechanism on the air intake pipe, and the air intake adjusting mechanism includes motor support, brake motor, driving gear, driven gear, pivot axle, valve, sets up two valves in the air intake pipe, and the middle part of each valve is provided with pivot axle, and each pivot axle is connected with driven gear, and the bottom of air intake pipe is provided with motor support, and sets up brake motor on motor support, and sets up driving gear on the output shaft of brake motor, and driving gear and driven gear gear transmission cooperation are matched. The utility model can be according to the wind pressure in the mill reasonable adjustment air supply, and the material in the mill will not jam the air intake pipe, and the grinding efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of cement production equipment technology, and in particular to a raw material grinding device for cement production. Background Technology

[0002] Traditional vertical mills grind granular materials by crushing them with grinding rollers as the grinding disc rotates. During the grinding process, the gas ejected from the nozzle ring outside the grinding disc forms an upward airflow that carries away the fine material on the grinding disc, while the coarse material on the grinding disc continues to be crushed and ground by the grinding rollers. However, the air pressure provided by the air inlet is not adjustable, which often results in excessively high air pressure inside the mill, leading to an increase in coarse material in the product and reducing product quality. In addition, the coarse material on the grinding disc is very easy to detach from the grinding disc during high-speed rotation and enter the nozzle ring under the action of centrifugal force, and then enter the air inlet pipe, causing blockage of the air inlet pipe. Utility Model Content

[0003] This utility model provides a raw material grinding device for cement production, which solves the problems of unstable air pressure inside the mill due to the non-adjustable air supply volume of traditional raw material vertical mills, which easily leads to unstable product quality and coarse material easily entering the air inlet pipe and causing blockage.

[0004] This utility model provides a raw material grinding device for cement production, including a mill housing, a grinding disc disposed within the mill housing, a grinding roller located above the grinding disc to crush the material, a drive device for driving the grinding disc to rotate, an air inlet located at the lower end of the mill housing, and an air outlet located at the upper end of the mill housing. A feed inlet is provided on the middle side wall of the mill housing, and a feed pipe is disposed within the feed inlet. A nozzle ring is also disposed around the grinding roller. The outer end of the air inlet is connected to an air inlet pipe, and an air inlet adjustment mechanism is disposed on the air inlet pipe. The air inlet adjustment mechanism includes a motor bracket, a brake motor, and... The system comprises a drive gear, a driven gear, a pivot shaft, and valves. Two vertical valves are symmetrically arranged on both sides inside the air inlet pipe. A pivot shaft is fixedly connected to the middle of each valve. The upper and lower ends of each pivot shaft are rotatably connected to the upper and lower side walls of the air inlet pipe, respectively. The lower end of each pivot shaft passes through the air inlet pipe and is coaxially fixedly connected to the driven gear. A motor bracket is provided at the bottom of the air inlet pipe. A brake motor is provided on the motor bracket. A drive gear is coaxially fixed on the output shaft of the brake motor. The drive gear and the driven gear are engaged in gear transmission.

[0005] In the above technical solution, an annular sieve plate is further provided above the nozzle ring and fixedly connected to the inner wall of the mill housing. An annular connecting plate is provided between the annular sieve plate and the grinding disc. The outer ring of the annular connecting plate is sealed and fixedly connected to the inner ring of the annular sieve plate. The inner ring of the annular connecting plate extends radially downward to above the edge of the outer ring of the grinding disc, and there is a gap between the inner ring edge of the annular connecting plate and the outer ring edge of the grinding disc.

[0006] In the above technical solution, an annular baffle is further provided on the upper side wall of the annular connecting plate.

[0007] In the above technical solution, a plurality of radially distributed scrapers are arranged on the grinding disc along the circumferential direction, and the scrapers are fixedly connected to the positioning seats provided on the annular connecting plate.

[0008] In the above technical solution, the inclination angle of the annular connecting plate is further 30° to 60°.

[0009] In the above technical solution, the scraper blade is further made of wear-resistant hard alloy steel.

[0010] In the above technical solution, a tapered tube is further provided at the lower end of the nozzle ring.

[0011] As can be seen from the above technical solutions, this utility model provides a raw material grinding device for cement production.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. The output shaft of the brake motor can drive the active gear to mesh with two driven gears. The two driven gears drive two pivot shafts to rotate, so that the two valves on the two pivot shafts open or close synchronously to control the amount of airflow supplied to the inside of the mill. This makes the air pressure supplied to the mill adjustable and prevents the air pressure inside the mill from being too high and affecting the quality of the product.

[0014] 2. The annular connecting plate and annular baffle can prevent coarse material from centrifugating the grinding disc into the nozzle ring and clogging the air inlet pipe. The annular screen plate can intercept impurities in the airflow supplied by the rotary kiln, preventing them from entering the mill and affecting product quality. After the coarse and fine materials on the grinding disc are compacted by the grinding rollers, the scraper can scrape the compacted material on the grinding disc, allowing the fine material to follow the airflow upward into the separator, where unqualified materials are intercepted. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of a raw material grinding device for cement production proposed in this utility model.

[0017] Figure 2This is a schematic diagram of the grinding disc installation position structure of a raw material grinding device for cement production proposed in this utility model.

[0018] Figure 3 Appendix to this utility model Figure 2 A partially enlarged structural diagram of position I;

[0019] Figure 4 This is a schematic diagram of the installation position of the air inlet regulating mechanism of a raw material grinding device for cement production proposed in this utility model.

[0020] Figure 5 This is a top view schematic diagram of a grinding disc for a raw material grinding device used in cement production according to the present invention.

[0021] Figure 6 Appendix to this utility model Figure 5 A schematic diagram of the AA section.

[0022] In the picture:

[0023] 1-Mill housing; 11-Air inlet; 12-Air outlet; 13-Feed pipe; 14-Air inlet pipe; 15-Discharge port; 2-Grinding disc; 21-Scraper; 22-Positioning seat; 3-Conical tube; 4-Drive device; 5-Nozzle ring; 6-Air inlet adjustment mechanism; 61-Motor bracket; 62-Brake motor; 63-Drive gear; 64-Driven gear; 65-Pivot shaft; 66-Valve; 7-Annular screen plate; 8-Annular connecting plate; 9-Annular baffle. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0025] Example 1:

[0026] See Figure 1-6A raw material grinding device for cement production includes a mill housing 1, a grinding disc 2 disposed within the mill housing 1, three grinding rollers positioned above the grinding disc 2 to crush the material, a separator disposed at the top of the mill housing 1, a drive device 4 for rotating the grinding disc 2, an air inlet 11 located at the lower end of the mill housing 1, and an air outlet 12 located at the upper end of the mill housing 1. A feed inlet is disposed on the middle side wall of the mill housing 1, and a feed pipe 13 is disposed within the feed inlet. Nozzle rings 5 ​​are also disposed around the grinding rollers. An air inlet pipe 14 is connected to the outer end of the air inlet 11. An air inlet regulating mechanism 6 is disposed on the air inlet pipe 14. The air inlet regulating mechanism 6 includes a motor bracket 61, a brake motor 62, a drive gear 63, a driven gear 64, and a pivot. A pivot shaft 65 and a valve 66 are provided. Two vertical valves 66 are symmetrically arranged on both sides inside the air inlet pipe 14. A pivot shaft 65 is fixedly connected to the middle of each valve 66. The upper and lower ends of each pivot shaft 65 are rotatably connected to the bearings in the bearing seats on the upper and lower side walls of the air inlet pipe 14, respectively. The lower end of each pivot shaft 65 passes through the lower side wall of the air inlet pipe 14 and is coaxially fixedly connected to the driven gear 64. A motor bracket 61 is fixedly installed at the bottom of the air inlet pipe 14. A brake motor 62 is fixedly installed on the motor bracket 61. A drive gear 63 is coaxially fixed on the output shaft of the brake motor 62. The drive gear 63 and the driven gear 64 are gears of the same specification and are engaged in gear transmission.

[0027] In the above embodiment, the brake motor 62 can drive its output shaft to drive the active gear 63 to mesh with the two driven gears 64. The two driven gears 64 drive the two pivot shafts 65 to rotate, so that the two valves 66 on the two pivot shafts 65 open or close synchronously to control the amount of airflow supplied to the mill, so that the air pressure inside the mill can be adjusted to prevent the air pressure inside the mill from being too high and affecting the quality of the product.

[0028] In the above embodiments, see Figure 3 , 6 An annular screen plate 7 is fixedly connected to the inner wall of the mill housing 1 above the nozzle ring 5. An annular connecting plate 8 is provided between the annular screen plate 7 and the grinding disc 2. The outer ring of the annular connecting plate 8 is sealed and fixedly connected to the inner ring of the annular screen plate 7. The inner ring of the annular connecting plate 8 extends radially downward to the edge above the outer ring of the grinding disc 2, and there is a gap between the inner ring edge of the annular connecting plate 8 and the outer ring edge of the grinding disc 2. The screen hole size of the annular screen plate 7 is Φ1mm, and the opening rate is 30%-40%. Impurities in the supplied air can be intercepted through the annular screen plate 7 to prevent them from entering the mill and affecting the quality of the product.

[0029] In the above embodiments, see Figure 3 , 6A ring baffle 9 is vertically installed on the upper side wall of the ring connecting plate 8. The ring baffle 9 can form an interception on the side wall of the ring connecting plate 8 to prevent large particles of material on the grinding disc 2 from escaping from below the grinding roller into the nozzle ring 5.

[0030] In the above embodiments, see Figure 2 , 3 6. Three radially distributed scraper blades 21 are arranged on the grinding disc 2 along the circumference. The gap between the scraper blades 21 and the grinding disc 2 is 0.5-1mm. The scraper blades 21 are fixedly connected to the positioning seat 22 on the annular connecting plate 8. The combination of the three scraper blades 21 reduces the material accumulation at the edge by 90%. The three scraper blades 21 are staggered with the three grinding rollers.

[0031] In the above embodiments, specifically, the inclination angle of the annular connecting plate 8 is 30° to 60°, and the annular connecting plate 8 is high on the outer ring and low on the inner ring. During the rotation of the grinding disc 2, the larger particles are centrifuged onto the annular connecting plate 8 by centrifugal force. By setting the annular connecting plate 8 to an inclination angle with the outer ring higher than the inner ring, the material that moves onto the annular connecting plate 8 can automatically return to the grinding disc 2 along the inclined surface of the annular connecting plate 8, thereby increasing the grinding efficiency of the material.

[0032] In the above embodiments, preferably, the scraper blade 21 is made of wear-resistant hard alloy steel to ensure that the scraper blade 21 has a long service life.

[0033] In the above embodiments, see Figure 6 Furthermore, a conical tube 3 is coaxially arranged at the lower end of the nozzle ring 5. The conical tube 3 is larger at the top and smaller at the bottom. The upper end face of the conical tube 3 is fixedly connected to the outer edge of the nozzle ring 5 so that the supplied airflow enters the conical tube 3 from the lower end of the conical tube 3, and then diffuses upward along the conical tube 3 to the surrounding area of ​​the nozzle ring 5, so that the airflow can be evenly supplied to the mill to screen the fine material.

[0034] In the above embodiments, preferably, an inspection port 15 is provided on the lower side wall of the mill housing 1, which is connected to the air chamber at the bottom of the grinding disc 2. An inspection door is provided on the outside of the inspection port 15. On the one hand, the inspection port 15 facilitates the inspection of the inside of the mill housing 1, and on the other hand, the inspection port 15 facilitates the cleaning of the dust deposited inside the lower end of the mill housing 1.

[0035] In the above embodiments, pressure transmitters are installed at locations such as the nozzle ring 5 and the mill outlet pipe to transmit absolute static pressure or differential pressure data to the controller in real time. The controller controls the opening and closing of valve 66 or the degree of opening and closing based on the monitored pressure. It can be understood that in order to ensure that the motor output shaft rotates to the accurate angle, the control system uses a position feedback device, such as a potentiometer or encoder, to convert the rotation angle of the motor output shaft into an electrical signal and feed it back to the controller. The controller compares the feedback signal with the set signal and adjusts the motor output according to the deviation value so that the output shaft rotates to the correct angle. Based on the deviation between the feedback signal and the set signal, the controller adjusts the motor output according to a certain control algorithm, such as the PID control algorithm. The PID control algorithm adjusts the motor output according to the adjustment of three parameters: proportional, integral, and derivative, so that the rotation angle of the motor output shaft can quickly and accurately track the set value, thereby achieving precise control of the valve opening.

[0036] As can be seen from the above technical solution, during use, when the sensor detects that the internal air pressure of the mill is too high, the brake motor 62 drives its output shaft to engage the drive gear 63 with the two driven gears 64. The two driven gears 64 drive the two pivot shafts 65 to rotate clockwise, causing the two valves 66 on the two pivot shafts 65 to close synchronously, thereby controlling and reducing the amount of airflow supplied to the inside of the mill. When the sensor detects that the internal air pressure of the mill is too low, the brake motor 62 drives its output shaft to engage the drive gear 63 with the two driven gears 64. The two driven gears 64 drive the two pivot shafts 65 to rotate counterclockwise, causing the two valves 66 on the two pivot shafts 65 to close synchronously, thereby controlling and reducing the amount of airflow supplied to the inside of the mill. The two valves 66 open synchronously to control the increase in the amount of airflow supplied to the inside of the mill. The controller controls the opening or closing of the air inlet pipe 14 according to the air pressure inside the mill. At the same time, when the mill is running, the coarse material on the grinding disc 2 will not enter the nozzle ring 5 and block the air inlet pipe 14 through the annular connecting plate 8 and the annular baffle 9. The annular screen plate 7 can intercept impurities in the airflow supplied by the rotary kiln to prevent them from entering the mill and affecting product quality. After the coarse and fine materials on the grinding disc 2 are compacted by the grinding roller, the scraper blade 21 can scrape up the compacted material on the grinding disc 2, so that the fine material follows the airflow upward into the separator and intercepts the unqualified material.

[0037] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art, which is common knowledge in the field. Furthermore, since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0038] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0039] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A raw material grinding device for producing cement, comprising a mill housing (1), a grinding disc (2) disposed within the mill housing (1), an air inlet (11) located at the lower end of the mill housing (1), and an air outlet (12) located at the upper end of the mill housing (1), a feed inlet being disposed on the middle side wall of the mill housing (1), a feed pipe (13) being disposed within the feed inlet, and a nozzle ring (5) being disposed around the grinding roller, characterized in that: The outer end of the air inlet (11) is connected to the air inlet pipe (14). An air inlet regulating mechanism (6) is provided on the air inlet pipe (14). The air inlet regulating mechanism (6) includes a motor bracket (61), a brake motor (62), a drive gear (63), a driven gear (64), a pivot shaft (65), and valves (66). Two vertical valves (66) are symmetrically arranged on both sides inside the air inlet pipe (14). A pivot shaft (65) is fixedly connected to the middle of each valve (66). (65) The upper and lower ends are respectively rotatably connected to the upper and lower side walls of the air inlet pipe (14). The lower end of each pivot shaft (65) passes through the air inlet pipe (14) and is coaxially fixedly connected to the driven gear (64). A motor bracket (61) is provided at the bottom of the air inlet pipe (14). A brake motor (62) is provided on the motor bracket (61). A drive gear (63) is coaxially fixed on the output shaft of the brake motor (62). The drive gear (63) and the driven gear (64) are gear transmission engaged.

2. The raw material grinding device for cement production according to claim 1, characterized in that, An annular screen plate (7) is fixedly connected to the inner wall of the mill housing (1) above the nozzle ring (5). An annular connecting plate (8) is provided between the annular screen plate (7) and the grinding disc (2). The outer ring of the annular connecting plate (8) is sealed and fixedly connected to the inner ring of the annular screen plate (7). The inner ring of the annular connecting plate (8) extends radially downward to above the edge of the outer ring of the grinding disc (2), and there is a gap between the inner ring edge of the annular connecting plate (8) and the outer ring edge of the grinding disc (2).

3. A raw material grinding device for cement production according to claim 2, characterized in that, An annular baffle (9) is provided on the upper side wall of the annular connecting plate (8).

4. A raw material grinding device for cement production according to claim 2, characterized in that, The grinding disc (2) has multiple radially distributed scraper blades (21) arranged on its circumference. The scraper blades (21) are fixedly connected to the positioning seat (22) arranged on the annular connecting plate (8).

5. A raw material grinding apparatus for cement production according to claim 4, characterized in that, The inclination angle of the annular connecting plate (8) is 30° to 60°.

6. A raw meal grinding apparatus for cement production according to claim 4, characterized in that, The scraper (21) is made of wear-resistant hard alloy steel.

7. A raw material grinding device for cement production according to claim 2, characterized in that, A tapered tube (3) is provided at the lower end of the nozzle ring (5).

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