Powder concentrator rotor structure with replaceable blades

Abstract

The invention belongs to the technical field of vertical mill powder selecting machines, and discloses a blade-replaceable powder selecting machine rotor structure which comprises a rotor shaft and a plurality of rotor blades, a rotor upper plate is connected to the upper portion of the outer end of the rotor shaft, a rotor lower plate is connected to the lower portion of the outer end of the rotor shaft, and a plurality of clamping grooves are formed in the circumferential direction of the rotor upper plate and the circumferential direction of the rotor lower plate. The upper portion and the lower portion of the rotor blade are connected into the clamping grooves in the rotor upper plate and the rotor lower plate respectively, the rotor blade is fixed to the rotor upper plate and the rotor lower plate through a special wedge-caulking structure, and the wedge-caulking structure comprises a rotor blade fixing plate connected to the upper portion of the rotor blade, a wedge-caulking bolt and a nut. According to the scheme, the rotor blade of the powder concentrator can be rapidly replaced, the maintenance work of the rotor of the powder concentrator can be completed in a short time, the maintenance cost of the powder concentrator and the replacement cost of quick-wear parts are reduced, the working efficiency is improved, and the purposes of reducing cost and improving efficiency are achieved.

Description

Technical Field

[0001] This invention relates to the field of vertical mill classifier technology, and in particular to a classifier rotor structure with replaceable blades. Background Technology

[0002] A vertical mill classifier is a separation device located above a vertical mill. Its function is to separate finished fine powder of the required fineness and discharge it from the mill cavity through the discharge port. Coarse powder that does not meet the fineness requirement cannot pass through the separation mechanism of the classifier and returns to the grinding mechanism of the vertical mill for further grinding. Its rotor structure directly affects the classification accuracy, sorting efficiency, equipment energy consumption, and product quality. The rotation of the rotor creates a forced vortex classification flow field. Qualified fine powder enters the rotor from the gap between the rotor blades and is then discharged through the discharge port. Unqualified coarse powder falls into the grinding area of ​​the vertical mill for further grinding. The classifier rotor is the core functional component of the classifier.

[0003] Currently, the rotors of mainstream air classifiers have the following technical defects: 1. Non-replaceable issue: The rotor is manufactured using integral welding or integral casting processes, with the rotor blades fixed to the overall rotor structure. Once the blades wear out severely, the entire rotor needs to be replaced or the worn blades need to be cut and re-welded for repair. Whether purchasing a new rotor or repairing the old rotor, the repair cycle is usually more than 5 days, resulting in long downtime and significant loss of production capacity. At the same time, replacing the rotor is costly, and even if the worn rotor blades are cut and repaired, the cost still accounts for 30%-50% of the total cost of the rotor.

[0004] 2. Dynamic balance issues: Local wear of welded or cast blades can disrupt the rotor's dynamic balance, causing equipment vibration. If the vibration is too great, the machine needs to be stopped to calibrate the rotor's dynamic balance. Even if some blades are designed to be replaceable, complex dynamic balancing adjustments are still required after replacement, increasing the difficulty of equipment maintenance.

[0005] 3. Poor structural redundancy: Existing replaceable blade designs rely on multi-level bolt fixing, which is complex and requires special tools for disassembly. There is also a risk of bolt loosening or breakage, resulting in low maintenance efficiency.

[0006] While some technical improvements have been proposed to address the problems inherent in the integral rotor structure, limitations still exist. 1. Split blade design: The blades are connected to the rotor body by bolts. This connection method is not precise enough. Due to the gap between the bolt holes and the bolts, the blade installation accuracy is insufficient. After replacing the blades, complex dynamic balancing is required. Moreover, once the bolt holes are worn, the rotor will lose dynamic balance and needs to be disassembled and recalibrated.

[0007] 2. Wear-resistant coating technology: Welding a tungsten carbide coating onto the blade surface can extend the blade's service life, but the blade still cannot be replaced locally. After wear and failure, repair is difficult and the blade needs to be returned to the factory for repair.

[0008] 3. Quick-connect structure: The rotor blades are installed using a slot, which allows for quick blade replacement and installation. However, it lacks an anti-loosening mechanism and is prone to loosening under high-speed operation, resulting in insufficient reliability. If a blade falls off, it will cause a major accident.

[0009] In summary, the existing rotor structure of air classifiers has significant defects in terms of maintainability, dynamic balance stability, material adaptability, and structural reliability, and an innovative design is urgently needed to solve the above problems. Summary of the Invention

[0010] This invention aims to provide a replaceable blade rotor structure for a classifier, addressing the problems mentioned in the background section. It employs a unique bayonet-bolt composite connection for fixing, with evenly distributed slots on the outer rings of the upper and lower rotor plates for precise blade positioning. The blades are fixed to the rotor body using a special wedge-tightening structure. The upper wedge-tightening structure consists of special wedge bolts and a fixing plate, while the lower wedge-tightening structure consists of a fixing ring and bolts. This fixing method not only achieves a safe and stable fixation but also makes blade replacement more convenient and efficient. The unique bayonet-locking positioning method restricts minute blade movements, ensuring that blades only reach their designed fixed positions. Theoretically, all blade positional errors are zero; in practice, this is determined by machining precision. This fixing method results in high rotor blade distribution accuracy, allowing for immediate use without complex dynamic balancing after blade replacement. This significantly improves rotor maintenance efficiency and greatly reduces the maintenance costs of the classifier.

[0011] To achieve the above objectives, the present invention provides the following technical solution: A replaceable blade classifier rotor structure includes a rotor shaft and multiple rotor blades. An upper rotor plate is connected to the upper outer end of the rotor shaft, and a lower rotor plate is connected to the lower outer end of the rotor shaft. Multiple slots are formed circumferentially on both the upper and lower rotor plates. The upper and lower parts of the rotor blades are respectively connected to the slots on the upper and lower rotor plates. The rotor blades are fixed to the upper and lower rotor plates by a special wedge-tightening structure. The wedge-tightening structure includes a rotor blade fixing plate connected to the upper part of the rotor blade, wedge bolts, and nuts, and a rotor blade connected to the lower part of the rotor blade. The rotor blade fixing plate has multiple trapezoidal holes, and the rotor upper plate has multiple square holes corresponding to the trapezoidal holes. The wedge bolts pass through the trapezoidal holes and square holes and are tightened by nuts, so that the rotor blade fixing plate is subjected to downward and inward forces, thereby locking the upper part of the rotor blade. The rotor blade fixing ring has a trapezoidal annular groove, which cooperates with the protruding part of the lower part of the rotor blade. The rotor blade fixing ring is connected to the rotor lower plate by bolts. The tightening force of the bolts is guided to the rotor blade through the wedge surface of the trapezoidal annular groove, thereby locking the lower part of the rotor blade.

[0012] Preferably, the outer rings of both the upper and lower rotor plates are configured as stepped structures, with the inner outer circle of the step contacting the corresponding position of the rotor blade to complete the radial positioning of the rotor blade, and the lower surface of the step contacting the corresponding position of the rotor blade to complete the axial positioning of the rotor blade.

[0013] Preferably, the two sides of the rotor blade fixing plate have a certain included angle with the contact surface of the adjacent rotor blade, and the center line of the wedge bolt is located on the bisector of the included angle.

[0014] Preferably, during the tightening process of the wedge bolt, the rotor blade fixing plate moves inward along the wedge surface, so that adjacent rotor blades are uniformly pressed in the radial direction.

[0015] Preferably, the trapezoidal groove wedge angle of the rotor blade fixing ring is less than 90°, and the lower protruding part of the rotor blade has a wedge angle that matches the trapezoidal groove.

[0016] Preferably, the inner end circumference of the rotor blade fixing ring is provided with a plurality of bolt holes at equal intervals, and the rotor lower plate is provided with a plurality of threaded holes corresponding to the bolt holes. The bolts are inserted through the threaded holes and bolt holes to fasten the rotor blade fixing ring to the rotor lower plate.

[0017] Preferably, a gap is provided between the top end of the rotor blade fixing ring and the bottom end of the rotor lower plate so that the tightening force generated when the bolt is tightened is guided to the lower part of the rotor blade through the wedge surface.

[0018] Preferably, the installation and positioning accuracy of the rotor blades is jointly ensured by the slots and wedge-tightening structures on the upper and lower rotor plates, thereby eliminating the need for dynamic balancing after blade replacement.

[0019] Preferably, the rotor blades can be made of different materials depending on the properties of the material, and can be quickly replaced on site.

[0020] The beneficial effects of this technical solution compared to existing technologies are as follows: This solution adopts a special bayonet-bolt composite connection and fixing method, which makes the rotor blade installation and positioning accuracy high, the gap and angle between adjacent blades highly consistent, and the blade wear more uniform during rotor operation. Compared with the traditional integral rotor, it can achieve higher classification accuracy and make the finished powder quality better.

[0021] This solution adopts a replaceable blade structure, which allows for the selection of more suitable blade materials based on the properties of the materials. At the same time, due to the high installation and positioning accuracy of the rotor blades, the wear of the blades is more uniform, extending the blade replacement cycle and improving the service life of the rotor.

[0022] This solution adopts a replaceable blade structure. Due to the special bayonet-bolt composite connection and fixing method, the rotor blade replacement operation is simple and can be quickly replaced on site. At the same time, due to the high positioning accuracy of the rotor blade, there is no need to perform dynamic balancing, which realizes efficient and convenient maintenance and greatly shortens the maintenance cycle.

[0023] This solution employs a replaceable blade structure, enabling on-site maintenance and replacement, shortening maintenance cycles, and effectively... This reduces rotor maintenance costs and indirectly saves time and labor costs, significantly improving the economic efficiency of the air classifier. Attached Figure Description

[0024] Figure 1 is a schematic diagram of the overall structure provided by the present invention; Figure 2 is a schematic diagram of the side structure provided by the present invention; Figure 3 is a top view of the structure provided by the present invention; Figure 4 is a schematic diagram of the structure at point A in Figure 2 provided by the present invention; Figure 5 is a schematic diagram of the first partial cross-sectional structure provided by the present invention; Figure 6 is a schematic diagram of the second partial cross-sectional structure provided by the present invention.

[0025] Reference numerals: 1. Rotor blade; 2. Rotor blade fixing plate; 3. Rotor shaft; 4. Rotor upper plate; 5. Rotor lower plate; 6. Bolts; 7. Rotor blade retaining rings; 8. Wedge bolts; 9. Nuts. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: As shown in Figures 1-3, a rotor structure for a classifier with replaceable blades includes a rotor shaft 3. An upper rotor plate 4 is fixedly connected to the upper part of the rotor shaft 3, and a lower rotor plate 5 is fixedly connected to the lower part. The upper rotor plate 4 and the lower rotor plate 5 have several slots evenly distributed in the circumferential direction for installing rotor blades 1. The rotor blades 1 are connected to the upper rotor plate 4 and the lower rotor plate 5 through special wedge-tightening structure fasteners to achieve the purpose of quick replacement of rotor blades.

[0027] As shown in Figures 3-5, Figure 4 is a partial view of A shown in Figure 3, and Figure 5 is... Figure 4 The cross-sectional view of section AA is shown in Figure 5. The outer side of the rotor upper plate 4 is stepped. The outer circle of the inner side of the step is used for radial positioning of the upper part of the rotor blade 1, and the lower surface of the step is used for axial positioning of the upper part of the rotor blade 1. The rotor blade fixing plate 2, the wedge bolt 8, and the nut 9 are used to lock the upper part of the rotor blade 1.

[0028] As shown in Figure 5, the rotor blade fixing plate 2 is installed on the stepped recessed surface of the rotor upper plate 4. The rotor blade fixing plate 2 has a trapezoidal hole that cooperates with the wedge bolt 8. The wedge bolt 8 is locked by the nut 9. During the locking process, the wedge bolt 8 moves downward, and the wedge surface presses against the rotor blade fixing plate 2 and applies a force to it along the wedge surface inward. Finally, the force is applied to the rotor blade 1 through the rotor blade fixing plate 2.

[0029] like Figure 4 As shown, the included angle between the two rotor blades is 2α1. The centerline of the wedge bolt 8 coincides with the bisector of the included angle between the two rotor blades, so that the inward movement direction of the rotor blade fixing plate 2 and the included angle between the two rotor blades is α1. In this way, the locking force generated by the wedge bolt 8 is evenly guided to the two rotor blades. Complete the fixing and locking of the upper part of rotor blade 1.

[0030] Figure 6 shows a partial sectional view of the lower part of the rotor. The outer side of the lower rotor plate 5 has a stepped shape similar to that of the upper rotor plate 4. The outer circle of the inner side of the step is used for radial positioning of the lower part of the rotor blade 1, and the recessed surface of the step is used for axial positioning of the lower part of the rotor blade 1. Bolts 6 and rotor blade fixing rings 7 are used to lock the lower part of the rotor blade 1. The rotor blade fixing ring 7 has a trapezoidal annular groove with a wedge angle α3 < 90°. The protruding part of the rotor blade 1 that mates with the wedge surface of the annular groove has the same wedge angle α3 as the annular groove. The inner side of the rotor blade fixing ring 7 has several bolt holes evenly distributed around its circumference. The corresponding lower rotor plate 5 has threaded holes. The rotor blade fixing ring 7 is fastened to the lower rotor plate 5 by bolts 6. There is a certain distance gap between the upper part of the rotor blade fixing ring 7 and the lower part of the lower rotor plate 5. When the bolts 6 are tightened, the tightening force is guided to the rotor blade 1 through the wedge surface, thus completing the fixing and locking of the lower part of the rotor blade 1.

[0031] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A classifier rotor structure with replaceable blades, characterized in that, include: The rotor shaft (3) has an upper rotor plate (4) connected to the upper part of its outer end and a lower rotor plate (5) connected to the lower part of its outer end. Multiple rotor blades (1) are provided with multiple slots in the circumferential direction of the upper rotor plate (4) and the lower rotor plate (5). The upper and lower parts of the rotor blades (1) are respectively connected to the slots on the upper rotor plate (4) and the lower rotor plate (5). The rotor blades (1) are fixed to the upper rotor plate (4) and the lower rotor plate (5) by a special wedge-tightening structure, the wedge-tightening structure comprising: The rotor blade fixing plate (2), wedge bolt (8) and nut (9) are connected to the upper part of the rotor blade (1). The rotor blade fixing plate (2) has multiple trapezoidal holes, and the upper rotor plate (4) has multiple square holes corresponding to the trapezoidal holes. The wedge bolt (8) passes through the trapezoidal holes and square holes and is tightened by the nut (9), so that the rotor blade fixing plate (2) is subjected to downward and inward forces, thereby achieving the locking of the upper part of the rotor blade (1). A rotor blade fixing ring (7) and a bolt (6) are connected to the lower part of the rotor blade (1). The rotor blade fixing ring (7) has a trapezoidal ring groove. The trapezoidal ring groove is matched with the protruding part of the lower part of the rotor blade (1). The rotor blade fixing ring (7) is connected to the rotor lower plate (5) by the bolt (6). The tightening force of the bolt (6) is guided to the rotor blade (1) through the wedge surface of the trapezoidal ring groove, thereby locking the lower part of the rotor blade (1).

2. The replaceable blade classifier rotor structure as described in claim 1, characterized in that: The outer rings of the upper rotor plate (4) and the lower rotor plate (5) are both set as stepped structures. The outer circle of the inner side of the step contacts the corresponding position of the rotor blade (1) to complete the radial positioning of the rotor blade (1). The lower surface of the step contacts the corresponding position of the rotor blade (1) to complete the axial positioning of the rotor blade (1).

3. The replaceable blade classifier rotor structure as described in claim 1, characterized in that: The two sides of the rotor blade fixing plate (2) have a certain angle with the contact surface of the adjacent rotor blade (1), and the center line of the wedge bolt (8) is located on the bisector of the angle.

4. The replaceable blade classifier rotor structure as described in claim 1, characterized in that: During the tightening process of the wedge bolt (8), the rotor blade fixing plate (2) moves inward along the wedge surface, so that the adjacent rotor blades (1) are uniformly pressed in the radial direction.

5. The replaceable blade classifier rotor structure as described in claim 1, characterized in that: The trapezoidal annular groove wedge angle of the rotor blade fixing ring (7) is less than 90°, and the lower protruding part of the rotor blade (1) has a wedge angle that matches the trapezoidal annular groove.

6. The replaceable blade classifier rotor structure as described in claim 1, characterized in that: The rotor blade fixing ring (7) has multiple bolt holes equidistantly spaced on its inner circumference. The rotor lower plate (5) has multiple threaded holes corresponding to the bolt holes. The bolt (6) passes through the threaded holes and bolt holes to fasten the rotor blade fixing ring (7) to the rotor lower plate (5).

7. The replaceable blade classifier rotor structure as described in claim 1, characterized in that: A gap is provided between the top end of the rotor blade fixing ring (7) and the bottom end of the rotor lower plate (5) so that the tightening force generated when the bolt (6) is tightened can be guided to the lower part of the rotor blade (1) through the wedge surface.

8. The replaceable blade classifier rotor structure as described in claim 1, characterized in that: The installation and positioning accuracy of the rotor blade (1) is jointly guaranteed by the slots and wedges on the upper rotor plate (4) and the lower rotor plate (5), so that no dynamic balancing adjustment is required after the blade is replaced.

9. The replaceable blade classifier rotor structure as described in claim 1, characterized in that: The rotor blades (1) can be made of different materials depending on the properties of the material, and can be quickly replaced on site.

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