A vertical roller mill grinding mechanism

Abstract

The application provides a vertical roller mill grinding mechanism, which comprises a driving mechanism and a grinding disc, the driving mechanism is arranged above the grinding disc, a plurality of groups of transmission shafts are arranged on the ring side of the driving mechanism; a grinding unit is assembled on the transmission shaft, the grinding unit comprises a grinding roller, a rotating sleeve rod and a connecting rod, the connecting rod is fixedly connected with the transmission shaft, the rotating sleeve rod is nested on the transmission shaft, and the grinding roller is arranged on the rotating sleeve rod; a transmission rod piece connection is arranged between the rotating sleeve rod and the connecting rod, and the grinding roller is suspended above the grinding disc. According to the application, the transmission rod piece is deformed to pull the rotating sleeve rod to change the gap between the grinding roller and the grinding disc along with the rotation of the transmission shaft, thereby achieving grading treatment through active change adjustment, treating material particles in stages, reducing frequent changes of stress of the grinding roller, improving the effect of the grinding roller on the material, and improving the efficiency of the processing process.

Description

Technical Field

[0001] This invention belongs to the technical field of vertical roller mills, and particularly relates to a grinding mechanism for a vertical roller mill. Background Technology

[0002] The vertical roller mill is driven by a motor and a reducer to rotate the grinding disc. Material falls into the center of the grinding disc through the feed inlet via an airlock feeder, while hot air enters the mill through the air inlet. As the grinding disc rotates, the material moves towards the edge of the grinding disc under centrifugal force. When it passes through the annular groove on the grinding disc, it is crushed by the grinding rollers. After crushing, the material is carried up by the high-speed airflow of the air ring at the edge of the grinding disc. Large particles fall directly onto the grinding disc for re-grinding. When the material in the airflow passes through the upper separator, under the action of the rotating rotor, the coarse powder falls from the cone hopper onto the grinding disc for re-grinding, while the qualified fine powder exits the mill with the airflow and is collected by a dust collection device, which is the product.

[0003] In vertical roller mills, large particles are returned to the grinding disc for further grinding under the action of cyclone separation. In existing technology, the grinding rollers in vertical roller mills adopt a passive structure, which causes the gap between the grinding disc and the grinding disc to change during the grinding process. This method usually applies a large pressure and deformation only occurs when the extrusion pressure between the grinding roller and the grinding disc is too large. This processing method results in uneven extrusion pressure when the particle diameter of the material on the grinding disc is different, and the grinding roller cannot effectively act on the material, resulting in low grinding efficiency. Summary of the Invention

[0004] This invention provides a grinding mechanism for a vertical roller mill, which aims to solve the problem of uneven pressure on the grinding rollers when the particle diameter of the material on the grinding disc is different, resulting in the grinding rollers not being able to effectively act on the material and thus causing low grinding efficiency.

[0005] This invention is implemented as follows: a vertical roller mill grinding mechanism, comprising:

[0006] A drive mechanism and a grinding disc, wherein the drive mechanism is located above the grinding disc and a plurality of transmission shafts are provided on the circumferential side of the drive mechanism;

[0007] A grinding unit is mounted on a drive shaft. The grinding unit includes a grinding roller, a rotating sleeve rod, and a connecting rod. The connecting rod is fixedly connected to the drive shaft. The rotating sleeve rod is nested on the drive shaft. The grinding roller is located at the end of the rotating sleeve rod away from the connecting rod.

[0008] A transmission rod is provided between the rotating sleeve rod and the connecting rod. The transmission rod includes a first connecting rod and a second connecting rod. The first connecting rod is hinged to the connecting rod, and the two ends of the second connecting rod are respectively hinged to the first connecting rod and the rotating sleeve rod.

[0009] The grinding roller is suspended above the grinding disc, and the transmission rod deforms as the transmission shaft rotates, pulling the rotating sleeve to change the gap between the grinding roller and the grinding disc.

[0010] Preferably, the drive mechanism includes a drive motor and a transmission mechanism, and the transmission shaft extends from the circumferential side of the transmission mechanism.

[0011] Preferably, the transmission shaft is arranged perpendicular to the motor shaft of the drive motor, the rotating sleeve is arranged parallel to the rotation plane of the grinding disc, and the grinding roller has a frustum structure.

[0012] Preferably, the end of the motor shaft of the drive motor is provided with a driving wheel, and the end of the transmission shaft away from the return spring is provided with a driven wheel, the rotation axis of the driven wheel being perpendicular to the rotation axis of the driving wheel.

[0013] Preferably, the transmission shaft is arranged inclined to the motor shaft of the drive motor, the rotating sleeve is arranged inclined to the rotation plane of the grinding disc, and the grinding roller is a cylindrical structure.

[0014] Preferably, the end of the motor shaft of the drive motor is provided with a driving wheel, and the end of the transmission shaft away from the return spring is provided with a driven wheel. The rotation axis of the driven wheel and the rotation axis of the driving wheel are obtuse. The end of the transmission shaft away from the transmission mechanism is also provided with a return spring, which is connected to the end face of the grinding roller away from the rotating sleeve rod.

[0015] Preferably, the first connecting rod is provided with a counterweight, the end of the first connecting rod away from the counterweight is rotatably connected to a connecting rod, and the second connecting rod is rotatably connected to the middle section of the first connecting rod.

[0016] Preferably, both the rotating sleeve and the grinding roller are provided with guide holes to accommodate the transmission shaft, and the rotating sleeve and the grinding roller are elastically connected.

[0017] Preferably, the rotating sleeve includes a front rod, a rear rod, and a spring, with one end of the front rod extending into the interior of the rear rod, and the spring nested on the outside of the front rod and the rear rod and connected to the front rod and the rear rod respectively.

[0018] Preferably, the front rod is provided with a hinge seat, the end of the second connecting rod away from the first connecting rod is hinged to the hinge seat, and the end of the rear rod away from the front rod is connected to the grinding roller.

[0019] Compared with the prior art, the embodiments of this application have the following main advantages:

[0020] 1. The vertical roller mill grinding mechanism provided by the present invention controls the rotational speed of the transmission shaft to cause the transmission rod to deform to different degrees under the action of centrifugal force, so that the gap between the grinding roller and the grinding disc can be actively adjusted to meet the processing needs of different diameters. By actively changing and adjusting, it can achieve graded processing, process the particle diameter of the material step by step, reduce the frequent changes in the force on the grinding roller, improve the interaction effect between the grinding roller and the material, and thus improve the efficiency of the processing process.

[0021] 2. The vertical roller mill grinding mechanism provided by the present invention changes the gap between the grinding roller and the grinding disc by controlling the rotation speed of the transmission shaft. The periodic change of the rotation speed can be used to process in segments, thereby reducing the time that the grinding roller is in the fine grinding state, relieving the processing pressure of the grinding roller, and improving the processing effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a vertical roller mill grinding mechanism provided by the present invention.

[0023] Figure 2 This is a top view schematic diagram of the grinding mechanism of a vertical roller mill provided by the present invention.

[0024] Figure 3 This is a schematic diagram of the grinding unit structure of a vertical roller mill grinding mechanism using a frustum-shaped grinding roller, as provided by the present invention.

[0025] Figure 4 yes Figure 3 A cross-sectional structural diagram of a grinding unit is provided.

[0026] Figure 5 This is a schematic diagram of a grinding unit structure using a cylindrical grinding roller in a vertical roller mill grinding mechanism provided by the present invention.

[0027] Figure 6 yes Figure 5 A cross-sectional structural diagram of a grinding unit is provided.

[0028] Figure 7 This is an exploded structural diagram of the transmission rod of a vertical roller mill grinding mechanism provided by the present invention.

[0029] Figure 8 This is a schematic diagram of the grinding roller and return spring structure of a vertical roller mill grinding mechanism provided by the present invention.

[0030] Figure 9 This is a schematic diagram of the front and rear rod structures of a vertical roller mill grinding mechanism provided by the present invention.

[0031] Figure 10This is a schematic diagram of the vertical arrangement of the motor shaft and transmission shaft of a vertical roller mill grinding mechanism provided by the present invention.

[0032] Figure 11 This is a schematic diagram of the inclined arrangement of the motor shaft and transmission shaft of a vertical roller mill grinding mechanism provided by the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100. Drive mechanism; 110. Drive motor; 111. Motor shaft; 120. Transmission mechanism; 121. Driving wheel; 122. Driven wheel; 130. Transmission shaft; 140. Return spring;

[0035] 200. Grinding unit; 210. Grinding roller; 220. Rotating sleeve; 221. Hinge seat; 222. Front rod; 223. Rear rod; 224. Spring; 230. Connecting rod; 240. Transmission rod; 241. First connecting rod; 242. Second connecting rod; 243. Counterweight;

[0036] 300. Grinding disc. Detailed Implementation

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] This invention provides a grinding mechanism for a vertical roller mill, such as... Figures 1-11 As shown, the grinding mechanism of the vertical roller mill includes:

[0040] The system includes a drive mechanism 100 and a grinding disc 300. The drive mechanism 100 is positioned above the grinding disc 300, and several sets of transmission shafts 130 are arranged around its circumference. The grinding disc 300 is arranged parallel to the ground, and its top surface is a sloping structure to facilitate the diffusion of material from the central area to the surrounding area. A motor is located below the grinding disc 300 to drive its rotation. The drive mechanism 100 includes a drive motor 110 and a transmission mechanism 120. The transmission shafts 130 extend from the circumference of the transmission mechanism 120. The drive motor 110 is perpendicular to the rotation of the grinding disc 300. Through the action of the transmission mechanism 120, several sets of power output shafts are formed. The grinding process is completed by utilizing the relative motion between the grinding mechanism on the power output shaft and the grinding disc 300.

[0041] A grinding unit 200 is mounted on a drive shaft 130. The grinding unit 200 includes a grinding roller 210, a rotating sleeve 220, and a connecting rod 230. The connecting rod 230 is fixedly connected to the drive shaft 130. The rotating sleeve 220 is nested on the drive shaft 130. The grinding roller 210 is located at the end of the rotating sleeve 220 away from the connecting rod 230. A transmission rod 240 is provided between the rotating sleeve 220 and the connecting rod 230. The transmission rod 240 includes a first connecting rod 241 and a second connecting rod 242. The first connecting rod 241 is hinged to the connecting rod 230, and the two ends of the second connecting rod 242 are respectively hinged to the first connecting rod 241 and the rotating sleeve 220.

[0042] The connecting rod 230 and the transmission shaft 130 maintain synchronous movement, while the rotating sleeve 220 is nested on the transmission shaft 130. The rotating sleeve 220 moves in sync with the connecting rod 230 under the action of the transmission rod 240. The transmission rod 240 adopts linkage transmission technology. When the rotation speed changes and the transmission rod 240 deforms, the rotating sleeve 220 will slide along the axial direction of the transmission shaft 130 under the action of deformation. The grinding roller 210 is suspended above the grinding disk 300. When the grinding roller 210 and the rotating sleeve 220 slide during rotation, the gap between the grinding roller 210 and the grinding disk 300 will change under the action of sliding.

[0043] Through the above functions, during the grinding process, the rotational speed of the drive shaft 130 can be controlled to cause the drive rod 240 to deform to different degrees under the action of centrifugal force, allowing the gap between the grinding roller 210 and the grinding disc 300 to be actively adjusted to meet the processing needs of different diameters. For example, during the processing, the rotational speed of the drive shaft 130 can be made to change periodically. When the rotational speed of the drive shaft 130 is low, the gap between the grinding roller 210 and the grinding disc 300 is larger, which can process large particles into small particles. When the rotational speed of the drive shaft 130 is high, the gap between the grinding roller 210 and the grinding disc 300 is smaller, which can process small particles into even finer particles.

[0044] By adjusting the rotation speed, the processing can be carried out in stages, thus avoiding the grinding roller 210 being in a constant state of fine grinding. This reduces processing pressure and improves processing efficiency. The segmented processing relies on the structural characteristics of the vertical roller mill. If the material does not meet the particle diameter requirements, it will be returned to the processing area for reprocessing. By adjusting the rotation speed, the material can be processed into a semi-finished product first, and then processed again after the material is returned. This reduces the huge wear and tear on the equipment caused by the first processing. The rotation speed variation curve can be adapted to the properties and particle size of the processed material.

[0045] In a preferred embodiment of this invention, the transmission shaft 130 is arranged perpendicular to the motor shaft 111 of the drive motor 110, the rotating sleeve 220 is arranged parallel to the rotation plane of the grinding disc 300, and the grinding roller 210 has a frustum structure; the transmission shaft 130 and the motor shaft 111 are connected by a helical gear transmission and speed reduction, thereby reducing the rotational speed of the transmission shaft 130.

[0046] The drive motor 110 has a drive wheel 121 at the end of the motor shaft 111, and a driven wheel 122 at the end of the transmission shaft 130 away from the return spring 140. The rotation axis of the driven wheel 122 is perpendicular to the rotation axis of the drive wheel 121.

[0047] In this embodiment, the gap between the sidewall of the grinding roller 210 and the grinding disk 300 is an inclined structure, and the grinding roller 210 moves parallel to the rotation plane of the grinding disk 300. In this way, the gap between the two will change during the movement. Here, there are three sets of drive shafts 130, and the number of grinding units 200 is the same as the number of drive shafts 130.

[0048] The transmission rod 240 deforms as the transmission shaft 130 rotates, pulling the rotating sleeve 220 to change the gap between the grinding roller 210 and the grinding disc 300.

[0049] In this embodiment, a return spring 140 is provided at the end of the drive shaft 130 away from the transmission mechanism 120, and a baffle is provided at the end of the drive shaft 130 away from the transmission mechanism 120. One end of the return spring 140 is connected to the side of the baffle facing the grinding roller 210, and the other end is connected to the grinding roller 210. The return spring 140 generates a pulling force on the end face of the grinding roller 210 away from the rotating sleeve 220, so that the grinding roller 210 is kept away from the transmission mechanism 120.

[0050] When the transmission rod 240 deforms during rotation, pulling the grinding roller 210 closer to the transmission mechanism 120, the return spring 140 begins to store energy. When the transmission rod 240 no longer needs to generate centripetal force to counteract centrifugal force due to the decrease in rotational speed, the elastic potential energy on the return spring 140 is released, pulling the grinding roller 210 away from the transmission mechanism 120 again, increasing the gap between the grinding roller 210 and the grinding disc 300.

[0051] In a preferred embodiment of this invention, the transmission shaft 130 is arranged inclined to the motor shaft 111 of the drive motor 110, the rotating sleeve 220 is arranged inclined to the rotation plane of the grinding disc 300, and the grinding roller 210 is a cylindrical structure; the transmission shaft 130 and the motor shaft 111 are connected by a helical gear transmission and speed reduction, thereby reducing the rotational speed of the transmission shaft 130.

[0052] The motor shaft 111 of the drive motor 110 is provided with a drive wheel 121 at its end, and the drive shaft 130 is provided with a driven wheel 122 at its end away from the return spring 140. The angle between the rotation axis of the driven wheel 122 and the rotation axis of the drive wheel 121 is an obtuse angle.

[0053] In this embodiment, there are three sets of drive shafts 130, and the number of grinding units 200 is the same as the number of drive shafts 130. The grinding roller 210 moves inclined to the rotation plane of the grinding disk 300. When the rotation speed changes, the grinding roller 210 moves along the inclined drive shaft 130. During the movement, the gap between the two will change. When the grinding roller 210 is inclined to the transmission rod 240 and no longer needs to generate centripetal force to counteract centrifugal force after the rotation speed decreases, the grinding roller 210 will automatically move away from the transmission mechanism 120 under its own weight, increasing the gap between the grinding roller 210 and the grinding disk 300.

[0054] In a further preferred embodiment of the present invention, a counterweight 243 is provided on the first connecting rod 241, and the end of the first connecting rod 241 away from the counterweight 243 is rotatably connected to the connecting rod 230, and the second connecting rod 242 is rotatably connected to the middle section of the first connecting rod 241.

[0055] In this embodiment, the counterweight 243 mainly increases the centrifugal force generated during rotation. When rotation occurs, the counterweight 243 will move away from the transmission shaft 130 under centrifugal force. By utilizing the characteristic of centrifugal force to traction the deformation of the transmission rod 240, the rotating sleeve rod 220 is pulled to move accordingly. The principle in this process can be referred to as the movement process of the centrifugal speed regulator. The hinge between the first connecting rod 241 and the second connecting rod 242 can also be achieved by a sealed bearing to realize the rotational connection, which on the one hand enhances the structural strength of the connection and on the other hand reduces the impact of powder on the rotational connection.

[0056] In a preferred embodiment of this invention, both the rotating sleeve 220 and the grinding roller 210 are provided with guide holes to accommodate the transmission shaft 130. The rotating sleeve 220 and the grinding roller 210 are elastically connected. The elastic connection between the rotating sleeve 220 and the grinding roller 210 gives the grinding roller 210 a certain degree of toughness. When there is too much material and the processing is unstable, the grinding roller 210 will actively slide under the thrust generated during the extrusion process to increase the gap between the grinding roller 210 and the grinding disc 300, thereby preventing material blockage and affecting the grinding progress.

[0057] In this application, the elastic connection between the rotating sleeve 220 and the grinding roller 210 is achieved as follows: the rotating sleeve 220 includes a front rod 222, a rear rod 223, and a spring 224. One end of the front rod 222 extends into the interior of the rear rod 223. The spring 224 is nested on the outside of the front rod 222 and the rear rod 223 and is connected to the front rod 222 and the rear rod 223 respectively. The center of both the front rod 222 and the rear rod 223 is provided with a guide hole to accommodate the transmission shaft 130 passing through.

[0058] The hinge seat 221 is mounted on the front rod 222, and the end of the second connecting rod 242 away from the first connecting rod 241 is hinged to the hinge seat 221. The end of the rear rod 223 away from the front rod 222 is connected to the grinding roller 210.

[0059] In this embodiment, the rear rod 223 is provided with a sliding cavity 252 for accommodating the front rod 222 at the end away from the grinding roller 210. A limiting ring plate is provided at the port of the sliding cavity 252 to restrict the slippage of the front rod 222. The end of the front rod 222 inserted into the sliding cavity is also provided with a limiting ring 251. The main function of the spring 224 is to maintain a certain distance between the front rod 222 and the rear rod 223. When subjected to force, the spring 224 can deform to change the relative position of the grinding roller 210. Under the condition of no external force interference, the limiting ring plate and the limiting ring 251 do not directly contact each other, providing space for deformation.

[0060] In a preferred embodiment of this invention, the outer wall of the limiting ring 251 is provided with a transmission guide groove, and the inner wall of the sliding cavity 252 is provided with a transmission guide rail adapted to the transmission guide groove. The transmission guide groove slides on the transmission guide rail. When the limiting ring 251 slides in the sliding cavity, the transmission guide groove and the transmission guide rail transmit torque from the front rod 222 to the rear rod 223.

[0061] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A grinding mechanism for a vertical roller mill, characterized in that, include: A drive mechanism (100) and a grinding disc (300) are provided. The drive mechanism (100) is located above the grinding disc (300). Several sets of transmission shafts (130) are provided on the circumferential side of the drive mechanism (100). The drive mechanism (100) includes a drive motor (110). A grinding unit (200) is mounted on a drive shaft (130). The grinding unit (200) includes a grinding roller (210), a rotating sleeve (220), and a connecting rod (230). The connecting rod (230) is fixedly connected to the drive shaft (130). The rotating sleeve (220) is nested on the drive shaft (130). The grinding roller (210) is located at the end of the rotating sleeve (220) away from the connecting rod (230). A transmission rod (240) is provided between the rotating sleeve (220) and the connecting rod (230). The transmission rod (240) includes a first connecting rod (241) and a second connecting rod (242). The first connecting rod (241) is hinged to the connecting rod (230), and the two ends of the second connecting rod (242) are respectively hinged to the first connecting rod (241) and the rotating sleeve (220). The grinding roller (210) is suspended above the grinding disc (300). The transmission rod (240) deforms as the transmission shaft (130) rotates, pulling the rotating sleeve (220) to change the gap between the grinding roller (210) and the grinding disc (300). A return spring (140) is provided at the end of the transmission shaft (130) away from the transmission mechanism (120). The return spring (140) is connected to the end face of the grinding roller (210) away from the rotating sleeve (220). The end of the motor shaft (111) of the drive motor (110) is provided with a drive wheel (121), and the end of the transmission shaft (130) away from the return spring (140) is provided with a driven wheel (122). A counterweight (243) is provided on the first connecting rod (241). The rotating sleeve (220) includes a front rod (222), a rear rod (223), and a spring (224). One end of the front rod (222) extends into the interior of the rear rod (223). The spring (224) is nested on the outside of the front rod (222) and the rear rod (223) and is connected to the front rod (222) and the rear rod (223) respectively. The front rod (222) is provided with a hinge seat (221), and the end of the second connecting rod (242) away from the first connecting rod (241) is hinged to the hinge seat (221). The end of the rear rod (223) away from the front rod (222) is connected to the grinding roller (210).

2. The grinding mechanism of a vertical roller mill as described in claim 1, characterized in that, The drive mechanism (100) further includes a transmission mechanism (120), and the drive shaft (130) extends from the circumferential side of the transmission mechanism (120).

3. The grinding mechanism of a vertical roller mill as described in claim 2, characterized in that, The transmission shaft (130) is arranged perpendicular to the motor shaft (111) of the drive motor (110), the rotating sleeve (220) is arranged parallel to the rotation plane of the grinding disc (300), and the grinding roller (210) is a frustum structure.

4. The grinding mechanism of a vertical roller mill as described in claim 3, characterized in that, The rotation axis of the driven wheel (122) is perpendicular to the rotation axis of the driving wheel (121).

5. The grinding mechanism of a vertical roller mill as described in claim 2, characterized in that, The transmission shaft (130) is arranged inclined to the motor shaft (111) of the drive motor (110), the rotating sleeve (220) is arranged inclined to the rotating plane of the grinding disc (300), and the grinding roller (210) is a cylindrical structure.

6. The grinding mechanism of a vertical roller mill as described in claim 5, characterized in that, The angle between the rotation axis of the driven wheel (122) and the rotation axis of the driving wheel (121) is an obtuse angle.

7. A vertical roller mill grinding mechanism as described in claim 1 or 6, characterized in that, The end of the first connecting rod (241) away from the counterweight (243) is rotatably connected to the connecting rod (230), and the second connecting rod (242) is rotatably connected to the middle section of the first connecting rod (241).

8. The grinding mechanism of a vertical roller mill as described in claim 7, characterized in that, Both the rotating sleeve (220) and the grinding roller (210) are provided with guide holes to accommodate the transmission shaft (130) through which it passes. The transmission shaft (130) passes through the guide holes to penetrate the rotating sleeve (220) and the grinding roller (210), and the rotating sleeve (220) and the grinding roller (210) are elastically connected.

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