A central shaft device for a mining disc filter

Abstract

This invention relates to a central shaft device for a mining disc filter, belonging to the field of mining disc filters. The central shaft device includes a central shaft body, which comprises an axial flow channel and a radial flow channel. The radial flow channel uses a composite bushing with a steel outer bushing and an inner bushing of wear-resistant ceramic tubes. The easily worn areas of the axial flow channel are entirely lined with wear-resistant ceramic plates. The wear-resistant ceramic plates are arranged in sections and fixed to the easily worn areas of the axial flow channel by welding, thereby improving the corrosion resistance and reliability of the flow channel. The central shaft device uses a sliding bearing support method to reduce dust interference and improve the ease of maintenance of the distribution head. A gear ring mounting flange is provided on the central shaft body, and the gear ring is connected by flange positioning and bolt engagement, improving the reliability of torque transmission. The central shaft device proposed in this invention effectively improves the wear resistance, operational stability, maintenance convenience, and transmission reliability of the central shaft.

Description

Technical Field

[0001] This invention relates to the field of mining disc filter technology, and more specifically to a central shaft device for a mining disc filter. Background Technology

[0002] Mining disc filters are core equipment for solid-liquid separation operations in the mining and beneficiation industry. They are mainly used for filtering and separating mineral slurry particles with different material properties. The central shaft device, as a key component for supporting transmission and guiding the medium in mining disc filters, must withstand the impact and abrasion of the slurry and continuously transmit torque over a long period of time.

[0003] The existing central shaft device has the following technical defects: 1. Insufficient wear resistance of the flow channel: Traditional central shaft flow channels are mostly made of metal and directly formed. When the slurry impacts the bottom surface of the flow channel at high speed, it is easy to cause local wear. Moreover, the wear rate difference between the non-impact area and the impact area is large, which leads to the destruction of the overall flatness of the flow channel, resulting in failures such as leakage and reduced filtration efficiency. Although some existing patents consider using irregular flow channels and built-in wear-resistant bushings to improve wear resistance, these bushings are mostly one-piece tubular structures adapted to the shape of the flow channel and fixed in the flow channel by adhesive. However, due to the long length of the flow channel, deformation is inevitable during processing. This one-piece bushing structure has poor feasibility in actual use, is difficult to fit the flow channel, and is easy to fall off or be damaged after impact, resulting in low reliability.

[0004] 2. Inconvenient operation and maintenance: The existing central shaft is mostly supported by rolling bearings, which are prone to jamming due to the influence of slurry dust. In addition, the distribution head is mostly integrated inside the bearing, and the bearing needs to be disassembled during maintenance, which is cumbersome, time-consuming and labor-intensive.

[0005] 3. Poor transmission reliability: The gear ring and the central shaft are mostly connected by a key, which has problems such as low positioning accuracy and unreliable torque transmission. Long-term operation is prone to problems such as keyway wear and key loosening, which can lead to abnormal transmission noise or even failure. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a central shaft device for a mining disc filter. By optimizing the structure of the central shaft device, it has advantages such as good wear resistance, high operational stability, convenient maintenance, and high transmission reliability.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A central shaft device for a mining disc filter includes a central shaft body, which comprises a central cylinder and axial flow channels. The axial flow channels extend axially along the central cylinder and are arranged around the circumference of the central cylinder. A partition ring plate is provided in the middle of the central cylinder. The axial flow channels on both sides of the partition ring plate are arranged alternately. Multiple support sleeve assemblies for mounting filter plates are evenly distributed axially on the outside of the central shaft body. Each support sleeve assembly has multiple radial flow channels in the circumferential direction. The radial flow channels are respectively connected to the axial flow channels and the filter plates. Radial wear-resistant bushings are provided inside the radial flow channels. The easily abraded areas of the axial flow channels are all lined with wear-resistant ceramic plates. The wear-resistant ceramic plates are arranged in sections and fixed to the side and bottom surfaces of the axial flow channels respectively. They are arranged in multiple segments along the length of the axial flow channels. Wear-resistant ceramic plates are also fixed on both sides of the partition ring plate at positions corresponding to each axial flow channel.

[0008] Furthermore, the wear-resistant ceramic plate has a through hole in the middle, the lower half of which is a conical hole and the upper half is a cylindrical hole. A matching stainless steel conical sleeve is fitted inside the conical hole, and a cylindrical pressure cap is installed inside the cylindrical hole. During installation, the wear-resistant ceramic plate is press-welded to the bottom and sides of the axial flow channel and the two sides of the partition ring plate through the stainless steel conical sleeve. Then, wear-resistant ceramic adhesive is used to insert the cylindrical pressure cap into the cylindrical hole to achieve sealing.

[0009] Furthermore, the wear-resistant ceramic plate is designed with different thicknesses, including double-thick ceramic plates and single-thick ceramic plates. Single-thick ceramic plates are welded to both sides of the axial flow channel, and single-thick ceramic plates are welded to both sides of the partition ring plate. The bottom surface of the axial flow channel facing the impact part of the slurry adopts a double-thick ceramic plate, while the bottom surface of the non-impact part adopts a double-layer structure of "metal pad + single-thick ceramic plate". The thickness of the metal pad is equal to the thickness of the single-thick ceramic plate, ensuring that the bottom surface of the entire axial flow channel is flat and smooth.

[0010] Furthermore, the lower edges of the wear-resistant ceramic plates on both sides of the axial flow channel are pressed against the upper edges of the bottom wear-resistant ceramic plate, forming a "side-pressing-bottom" sealing structure. All gaps between the wear-resistant ceramic plates are filled and compacted with wear-resistant ceramic adhesive to achieve wear-resistant protection throughout the flow channel and prevent slurry from seeping into the metal matrix of the flow channel.

[0011] Furthermore, the radial wear-resistant bushing is a composite bushing assembled from a steel outer bushing, wear-resistant ceramic adhesive, and an inner wear-resistant ceramic tube.

[0012] Furthermore, the partition ring plate is welded to the middle of the central cylinder, and the axial flow channel is formed by welding the flow channel partition plate and the flow channel cover plate. The drive end flow channel partition plate is welded to the central cylinder on the left side of the partition ring plate, and the non-drive end flow channel partition plate is welded to the central cylinder on the right side of the partition ring plate. The drive end and non-drive end flow channel partition plates are evenly distributed along the circumference. The drive end and non-drive end flow channel partition plates are staggered in the circumferential direction by half the angle of the axial flow channel. The flow channel cover plate is welded to the top surface of two adjacent flow channel partition plates, thus forming several axial flow channels with closed fan-shaped cross sections evenly distributed along the circumference.

[0013] Furthermore, shaft end flanges are welded to both ends of the central shaft for connecting the distribution pad assembly; the central shaft is supported by sliding bearings, and drive end sliding bearing support rings and non-drive end sliding bearing support rings are welded to the central shaft inside the shaft end flanges at both ends for supporting the entire central shaft on the transmission bearing seat; the distribution head is installed on the distribution pad assembly located outside the sliding bearing support rings at both ends.

[0014] Furthermore, the dispensing pad assembly includes a dispensing pad, a support shaft, and an end cap. The dispensing pad is connected and fixed to the shaft end flange of the central shaft body by fasteners. The support shaft is fixed in the middle of the dispensing pad, and the dispensing head is mounted on the support shaft. An end cap is installed at the end of the support shaft, and the dispensing head is positioned and pressed against the outer end face of the dispensing pad by the end cap.

[0015] Furthermore, both the drive end sliding bearing support ring and the non-drive end sliding bearing support ring are designed as a segmented structure. Each sliding bearing support ring consists of 4 segments. The 4 segments are rolled into circles with the same curvature and then assembled on the central shaft. They are then welded together and then welded to the central shaft.

[0016] Furthermore, the drive end of the central shaft is provided with a gear ring mounting flange, which is fitted onto the central shaft and welded to it. The outer ring of the gear ring mounting flange is machined with a radial positioning surface, an axial positioning surface, and a connecting flange hole. The gear ring mounting flange and the gear ring body flange are positioned by a stop to ensure the coaxiality of the gear ring and the central shaft. The gear ring mounting flange and the gear ring body flange are connected by bolts evenly distributed around the circumference.

[0017] Using the technical solution of the present invention has at least the following beneficial effects: Significantly improved wear and corrosion resistance: The radial flow channel adopts a composite bushing with an inner lining of wear-resistant ceramic tubes, effectively enhancing the wear and corrosion resistance of the radial flow channel; the entire axial flow channel is lined with welded wear-resistant ceramic plates, and the impact area uses a double-thickness ceramic plate design, while the non-impact area uses a "pad plate + single-thickness ceramic plate" structure, ensuring both a flat bottom surface and full-area impact and wear resistance, extending the service life of the flow channel by 2-3 times. Furthermore, the wear-resistant ceramic plates are made of independently segmented small-sized plates, assembled from multiple small units inside the axial flow channel, resulting in better fit with the flow channel and better adaptability to complex stress and deformation conditions. This design offers strong feasibility, and the unique structural design, using metal welding to fix the wear-resistant ceramic plates within the flow channel, greatly improves the reliability and durability of the wear-resistant bushing.

[0018] High operational stability: The use of sliding bearings reduces dust interference and reduces the radial runout of the central shaft to less than 0.1mm, avoiding equipment downtime caused by bearing jamming.

[0019] Reduced maintenance costs: The distribution heads are installed on the distribution pad assemblies on the outside of the sliding bearings at both ends. During maintenance, there is no need to disassemble the central shaft bearing. Only the end cover plate of the distribution pad assembly needs to be removed, which greatly improves the convenience of maintenance, reduces maintenance time by more than 50%, and reduces equipment downtime losses.

[0020] Enhanced transmission reliability: The gear ring mounting flange is designed, and the transmission gear ring is positioned by the flange stop to ensure coaxiality with the central shaft. The torque is transmitted through a large friction surface and high-strength bolts, which can reliably withstand the maximum working torque of the central shaft. There is no risk of slippage or wear, and the probability of transmission failure is greatly reduced. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the central shaft device of the present invention.

[0022] Figure 2 This is a partial schematic diagram of the AA section of the drive end flow channel.

[0023] Figure 3 This is a partial schematic diagram of the cross-section of the drive end flow channel BB.

[0024] Figure 4 This is a partial schematic diagram of the CC section of the non-driving end flow channel.

[0025] Figure 5 This is a partial schematic diagram of the DD cross-section of the non-driving end flow channel.

[0026] Figure 6 This is a schematic diagram of the cross-section of the composite bushing inside the radial flow channel.

[0027] Figure 7 This is a schematic diagram of the structure of a wear-resistant ceramic plate.

[0028] Figure 8 This is a schematic diagram of the cross-section of the sliding bearing support ring EE at the drive end.

[0029] Figure 9 This is a schematic diagram of the cross-section of the non-driving end sliding bearing support ring FF.

[0030] Figure 10 This is a schematic diagram of the distribution pad assembly structure.

[0031] Figure 11 A schematic diagram of the flange structure for mounting the gear ring.

[0032] Figure 12 for Figure 11 Left view of the flange mounting on the gear ring.

[0033] Reference numerals: 1. Distribution pad assembly; 2. Shaft end flange; 3. Gear ring mounting flange; 4. Drive end sliding bearing support ring; 5. Drive end flow channel cover plate; 6. Bracket sleeve assembly; 7. Separator ring plate; 8. Non-drive end flow channel cover plate; 9. Non-drive end sliding bearing support ring; 10. Wear-resistant ceramic plate; 11. Center cylinder; 12. Separator ring plate side ceramic plate; 13. Drive end flow channel partition plate; 14. Drive end flow channel side ceramic plate; 15. Drive end flow channel bottom ceramic plate; 16. Drive end flow channel bottom pad plate; 17. Double-thickness ceramic plate; 18. Composite bushing; 19. Non-drive end... 20. Ceramic plate on the side of the moving end flow channel; 21. Baffle plate of the non-driving end flow channel; 22. Ceramic plate at the bottom of the non-driving end flow channel; 23. Bottom pad of the non-driving end flow channel; 24. Steel outer bushing; 25. Wear-resistant ceramic adhesive; 26. Wear-resistant ceramic tube; 27. End cap fastener; 28. End cap; 29. ​​Support shaft; 30. Distribution pad; 31. Outer ring fastener; 32. Inner ring fastener; 33. Support shaft fastener; 34. Axial positioning surface of the gear ring; 35. Radial positioning surface of the gear ring; 36. Gear ring connecting flange hole; 37. Stainless steel tapered sleeve; 38. Cylindrical gland; 39. Stainless steel weld metal. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0035] This invention provides a central shaft device for a mining disc filter, aiming to solve the problems of poor wear and corrosion resistance, insufficient operational stability, inconvenient maintenance, and low transmission reliability of existing mining disc filter central shaft devices. The following description, in conjunction with embodiments and appendices, provides further details. Figure 1-12 The central shaft devices of each of the present invention will be described in detail.

[0036] Example 1

[0037] The central shaft device of a mining disc filter according to this embodiment includes a central shaft body, a wear-resistant ceramic lining, a support device, a transmission assembly, and a distribution pad assembly 1.

[0038] like Figure 1-5 As shown, the central shaft mainly consists of a central cylinder 11, a partition ring plate 7, flow channel baffles, flow channel cover plates, shaft end flanges 2, and a support sleeve assembly 6. The partition ring plate 7 is welded to the circumferential surface of the central cylinder 11. A drive-end flow channel baffle 13 is welded to the central cylinder 11 on the left side of the partition ring plate 7, and a non-drive-end flow channel baffle 20 is welded to the central cylinder 11 on the right side of the partition ring plate 7. Both the drive-end and non-drive-end flow channel baffles extend axially and are evenly distributed circumferentially. The drive-end and non-drive-end flow channel baffles are arranged alternately, specifically, as shown in the figure. Figure 2-5 As shown, the angle between the drive end flow channel baffle 13 and the vertical center line is half the flow channel angle θ / 2, and the angle between the non-drive end flow channel baffle 20 and the vertical center line is the flow channel angle θ. That is, the drive end and non-drive end flow channel baffles are arranged on both sides of the partition ring plate 7 at a half flow channel angle. The drive end flow channel cover plate 5 and the non-drive end flow channel cover plate 8 are respectively welded to the top surface of the corresponding flow channel baffle, thereby forming a number of staggered axial flow channels with closed fan-shaped cross sections at both ends of the central cylinder 11.

[0039] The central shaft has a built-in closed fan-shaped cross-section flow channel, which has a larger flow area and a smaller radial dimension than the traditional circular cross-section flow channel. This can effectively reduce the flow velocity of the filtrate in the flow channel, reduce the scouring and erosion of the flow channel by the filtrate, and improve the wear resistance life of the flow channel. The staggered arrangement of the drive end and non-drive end flow channels can save 50% of the unloading compressed air volume, effectively achieving energy saving and consumption reduction.

[0040] The shaft end flanges 2 are welded to both ends of the central shaft and are used to connect the distribution pad assembly 1. The bracket sleeve assembly 6 is evenly distributed along the axial direction on the central shaft and is used to install the filter plate. Each bracket sleeve assembly 6 has multiple radial flow channels in the circumferential direction, which are connected to the axial flow channel and the fan-shaped filter plate respectively. The transmission assembly is used to transmit the torque of the drive motor, and the support device is used to support the entire central shaft. The transmission assembly and the support device are respectively located at corresponding positions on the central shaft. The distribution pad assembly 1 is installed on the shaft end flanges 2 at both ends of the central shaft and is used to suspend the distribution head. All the above components constitute the central shaft.

[0041] Both the radial and axial flow channels of the central shaft are provided with wear-resistant ceramic linings, which are the core of the medium flow guide and specifically include a radial wear-resistant bushing and a wear-resistant ceramic plate 10 lining the axial flow channel.

[0042] The radial wear-resistant bushing is a composite structure consisting of a steel outer bushing 23 and an inner wear-resistant ceramic tube 25, bonded together with ceramic adhesive. It is positioned within the radial flow channel of the support sleeve assembly 6. Specifically, as shown... Figure 6As shown, the radial wear-resistant bushing is a composite bushing 18 assembled from a steel outer bushing 23, wear-resistant ceramic adhesive 24, and an inner wear-resistant ceramic tube 25.

[0043] The wear-prone areas of the axial flow channel are all lined with wear-resistant ceramic plates 10. The wear-resistant ceramic plates 10 in this invention are designed as independent small-sized plates, which are set in sections and fixed to the side and bottom surfaces of the axial flow channel, as well as the two sides of the partition ring plate 7. Since they are small-sized plates designed in sections, the wear-resistant ceramic plates 10 are arranged in multiple segments along the length of the axial flow channel. Preferably, the wear-resistant ceramic plate 10 is a small rectangular plate, and the width of a single rectangular plate is adapted to the bottom width of the axial flow channel. The length L of the wear-resistant ceramic plate 10 can be distributed according to the total length of the axial flow channel. For example, it can be set according to the number of filter plates on the central shaft. Usually, 5-8 wear-resistant ceramic plates 10 are arranged between every two filter plates. In this embodiment, the length and width of the wear-resistant ceramic plate 10 are 100mm and 50mm, respectively. Of course, it is not limited to this in actual use. Those skilled in the art can choose a suitable size as needed. Furthermore, the wear-resistant ceramic plates 10 arranged on both sides of the partition ring plate 7 can use the small rectangular plates mentioned above to reduce manufacturing complexity and cost. Alternatively, small fan-shaped plates with the same cross-sectional shape as the axial flow channel can be selected to better match the end face shape of the axial flow channel and achieve better protection for the partition ring plate 7.

[0044] In this embodiment, a series of wear-resistant ceramic plates 10 are arranged on the sides, bottom, and both sides of the partition ring plate 7 of the axial flow channel, which can provide comprehensive protection for the easily eroded areas of the axial flow channel and improve the wear resistance of the flow channel. The wear-resistant ceramic plates 10 are designed as independent small-sized plates, which are assembled from multiple small units inside the axial flow channel. This makes it easy to adapt to the welding deformation of the axial flow channel and can effectively match the shape of the flow channel during installation, ensuring the feasibility and operability of the wear-resistant layer installation.

[0045] To improve the reliability of the wear-resistant ceramic lining, the wear-resistant ceramic plates 10 in this embodiment are all fixed by welding. For example... Figure 7As shown, taking the wear-resistant ceramic plate 10 welded to the bottom of the axial flow channel as an example, a through hole is provided in the middle of the wear-resistant ceramic plate 10. The lower half of the through hole is a conical hole, and the upper half is a cylindrical hole. The diameter of the cylindrical hole is larger than the large end diameter of the conical hole. A matching stainless steel conical sleeve 36 is fitted inside the conical hole, and a cylindrical pressure cap 37 is provided inside the cylindrical hole. The stainless steel conical sleeve 36 is welded with stainless steel welding rods, forming stainless steel weld metal 38 inside to prevent loosening due to rust. During installation, the wear-resistant ceramic plate 10 is press-welded to the bottom, side, and side of the axial flow channel and the partition ring plate 7 through the stainless steel conical sleeve 36. Then, the cylindrical pressure cap 37 is installed on top of the stainless steel conical sleeve 36 using wear-resistant ceramic adhesive 24, thereby pressing and fixing the wear-resistant ceramic plate 10 to each surface of the axial flow channel by welding. This structure can effectively prevent the wear-resistant layer from falling off due to the harsh working conditions of slurry entering the flow channel, ensuring the reliable and stable wear resistance of the flow channel.

[0046] Furthermore, the wear-resistant ceramic plate 10 of the present invention is designed with two thickness specifications: conventional thickness and thickened thickness. In this embodiment, the single-thickness ceramic plate is the conventional thickness wear-resistant ceramic plate 10, and the double-thickness ceramic plate 17 is the thickened wear-resistant ceramic plate 10. The thickness of the double-thickness ceramic plate 17 is twice the thickness of the single-thickness ceramic plate. Figure 3-4 As shown, the bottom surface of the axial flow channel facing the slurry impact (usually the position corresponding to the filter plate) uses a double-thickness ceramic plate 17, the thickness of which is adapted according to the slurry impact intensity, such as... Figure 2 and 5 As shown, the bottom surface of the axial flow channel, which is not directly facing the impact, adopts a double-layer structure of "metal pad + single-thickness ceramic plate". The thickness of the metal pad is equal to the thickness of the single-thickness ceramic plate, and the sum of the two is equal to the thickness of the double-thickness ceramic plate 17. This ensures that the entire bottom surface of the axial flow channel is flat and smooth, avoiding medium retention or uneven local wear. Single-thickness ceramic plates are welded to both sides of the axial flow channel, and the lower edge of the wear-resistant ceramic plates 10 on both sides is pressed against the upper side edge of the bottom wear-resistant ceramic plate 10, forming a "side-pressing-bottom" sealing structure. Single-thickness ceramic plates are welded to both sides of the central shaft dividing ring plate 7. All gaps between the wear-resistant ceramic plates 10 are filled and compacted with wear-resistant ceramic adhesive 24 to achieve wear-resistant protection of the entire flow channel area, prevent slurry from penetrating into the flow channel metal matrix, and improve the overall anti-abrasion and anti-impact capabilities.

[0047] In specific implementation, such as Figure 2-5As shown, before the flow channel baffle is welded and the flow channel cover is welded, the top surface of the axial flow channel is not yet closed to facilitate the welding of the wear-resistant ceramic plate 10. First, a double-thickness ceramic plate 17 is welded to the impact area (the position corresponding to the filter plate) on the central cylinder 11. In the non-impact area, the drive end flow channel bottom pad plate 16 and the non-drive end flow channel bottom pad plate 22 are welded first, followed by the drive end flow channel bottom ceramic plate 15 and the non-drive end flow channel bottom ceramic plate 21. Then, the ceramic plate 12 on the side of the partition ring plate is welded to both sides of the partition ring plate 7. All the welded wear-resistant ceramic plates 10 are then connected to the flow channel steel. All gaps between the plates are filled, compacted, and smoothed with wear-resistant ceramic adhesive 24. After the wear-resistant ceramic adhesive 24 has completely cured, the ceramic plate 14 on the drive end flow channel side and the ceramic plate 19 on the non-drive end flow channel side are welded to the two sides of the drive end flow channel partition 13 and the non-drive end flow channel partition 20, respectively, to ensure that all flow channel side ceramic plates press tightly against the flow channel bottom ceramic plate. Similarly, all gaps between all flow channel side ceramic plates and flow channel steel plates, and between flow channel side ceramic plates and flow channel bottom ceramic plates are filled, compacted, and smoothed with wear-resistant ceramic adhesive 24 to form an axial wear-resistant flow channel structure. Then, the flow channel cover plate is welded. The ceramic plate 12 on the side of the partition ring plate, the ceramic plate 14 on the side of the drive end flow channel, the ceramic plate 15 at the bottom of the drive end flow channel, the ceramic plate 19 on the side of the non-drive end flow channel, and the ceramic plate 21 at the bottom of the non-drive end flow channel are all single-thickness ceramic plates. The bottom pad plate 16 at the drive end flow channel and the bottom pad plate 22 at the bottom of the non-drive end flow channel are metal pads with the same thickness as the single-thickness ceramic plates.

[0048] The radial flow channel of this invention adopts a composite bushing 18 with a wear-resistant ceramic tube 25 as the inner lining, which effectively enhances the wear and corrosion resistance of the radial flow channel. The wear-resistant ceramic plate 10 is welded throughout the axial flow channel, which effectively improves the reliability of the wear-resistant layer. The impact area adopts a double-thick ceramic plate 17 design, and the non-impact area adopts a "metal pad + single-thick ceramic plate" structure, which not only ensures the flatness of the bottom surface, but also achieves impact and wear resistance throughout the entire area, which can extend the service life of the flow channel by 2-3 times.

[0049] Example 2

[0050] Based on Embodiment 1 above, this embodiment provides a detailed description of the support device for the central shaft assembly. In this embodiment, the central shaft assembly adopts a sliding bearing support method, using a sliding bearing support ring to support the entire central shaft on the transmission bearing seat. Compared with traditional rolling bearings, this reduces the impact of slurry dust on the bearing, lowers the risk of jamming, and ensures smooth operation of the central shaft.

[0051] like Figure 1 and Figure 8 , Figure 9As shown, the drive end sliding bearing support ring 4 and the non-drive end sliding bearing support ring 9 are respectively arranged at both ends of the central shaft. Both are designed as a segmented structure, with each sliding bearing support ring having 4 segments. The 4 segments are rolled into circles with the same curvature and then assembled on the central shaft. The four bevel welding positions are positioned at the flow channel partition. The four segments are welded together axially using a V-shaped weld with a blunt edge. The two ends of the sliding bearing support ring are welded to the central shaft using a continuous circumferential fillet weld. After welding, the ring is machined as a whole with the central shaft to meet the assembly dimensions.

[0052] Because the outer surface of the central shaft is polygonal rather than a complete circle, the segmented structure of the sliding bearing support ring can better fit the outer surface of the central shaft for welding, which is convenient to manufacture, easy to implement, and has high connection strength and small gap.

[0053] This embodiment uses a sliding bearing support method. The support position is set inside the flange 2 at the end of the central shaft. The distribution head is installed on the distribution pad assembly 1 on the outer side of the sliding bearings at both ends. In this way, when inspecting the distribution head, it is not necessary to disassemble the bearing of the central shaft. Only the end cover plate of the distribution pad assembly 1 needs to be removed, which greatly improves the convenience of maintenance.

[0054] like Figure 10 As shown, the distribution pad assembly 1 includes: a distribution pad 29, an outer ring fastener 30, an inner ring fastener 31, a support shaft 28, a support shaft fastener 32, an end cap 27, and an end cap fastener 26. One end of the support shaft 28 is mounted on the distribution pad 29 via the support shaft fastener 32. The distribution pad 29 is mounted on the shaft end flange 2 of the central shaft via the outer ring fastener 30 and the inner ring fastener 31. The distribution head (not shown in the figure) is mounted on the support shaft 28. The end cap 27 is mounted on the other end of the support shaft 28 via the end cap fastener 26. The distribution head is pressed and positioned on the outer end face of the distribution pad 29 by the cooperation of the end cap fastener 26 and the end cap 27. When inspecting the distribution head, the end cap fastener 26 and the end cap 27 can be removed without disassembling the bearing or other components. The operation is simple, time-saving, and labor-saving, greatly improving the maintenance efficiency.

[0055] Example 3

[0056] Based on the above embodiment 1, the transmission component in this embodiment uses a gear ring mounting flange 3 for torque transmission. The torque of the drive motor is transmitted to the central shaft through the gear ring. The gear ring that drives the central shaft to rotate is connected to the central shaft through a flange structure, thereby improving the reliability of the transmission.

[0057] Gear ring mounting flange 3 welded as follows Figure 11-12 The structure shown has an inner ring fitted onto a central shaft. The two end faces are welded to the central shaft using continuous circumferential fillet welds. After welding, the inner ring is machined integrally with the central shaft. Separate machining processes are then performed. Figure 11-12The radial positioning surface 34, axial positioning surface 33, and connecting flange hole 35 of the gear ring shown are used for mounting and fixing the gear ring. Specifically, the radial positioning surface 34 and axial positioning surface 33 are used to position the gear ring body flange (not shown in the figure) with a stop, and the connecting flange hole 35 is used to connect the gear ring body flange and the gear ring mounting flange 3 by bolts.

[0058] The gear ring mounting flange 3 is welded and fixed to the end of the drive end of the central shaft. In this embodiment, as shown... Figure 1 As shown, the gear ring mounting flange 3 is located between the shaft end flange 2 of the drive end and the sliding bearing support ring 4 of the drive end. The gear ring mounting flange 3 and the gear ring body flange are positioned by a stop to ensure the coaxiality of the gear ring and the central shaft. The gear ring mounting flange 3 and the gear ring body flange are connected by high-strength bolts evenly distributed around the circumference. After the bolts are pre-tightened, the contact surface between the gear ring mounting flange 3 and the gear ring body flange forms a large friction surface, which transmits torque through frictional torque, avoiding the stress concentration and wear problems of traditional key connections, and ensuring the reliability of transmission.

[0059] Example 4

[0060] The technical solution of this embodiment is a combination of the solutions of the above embodiments 1, 2 and 3. That is, based on embodiment 1, it adopts both the sliding bearing support method of embodiment 2 and the large friction surface torque transmission method of the gear ring mounting flange 3 described in embodiment 3. The overall technical solution achieves the comprehensive effect of high wear and corrosion resistance, stable operation, convenient maintenance and high transmission reliability.

[0061] The technical solutions of the present invention have been described in detail above with reference to embodiments 1-4. Of course, the implementation of the present invention is not limited to the above embodiments. Those skilled in the art can implement the above embodiments individually or in combination in actual use.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A central shaft device for a mining disc filter, comprising a central shaft body, the central shaft body including a central cylinder and axial flow channels, the axial flow channels extending axially along the central cylinder and arranged around the circumference of the central cylinder, a partition ring plate provided in the middle of the central cylinder, the axial flow channels on both sides of the partition ring plate being arranged alternately, and a plurality of support sleeve assemblies for mounting filter plates being evenly distributed axially on the outside of the central shaft body, each support sleeve assembly having a plurality of radial flow channels in the circumferential direction, the radial flow channels being respectively connected to the axial flow channels and the filter plates, characterized in that: The radial flow channel is provided with a radial wear-resistant bushing, and the easily worn areas of the axial flow channel are all lined with wear-resistant ceramic plates. The wear-resistant ceramic plates are arranged in sections and fixed to the side and bottom surfaces of the axial flow channel respectively. They are also arranged in multiple sections along the length of the axial flow channel. The wear-resistant ceramic plates are also fixed on both sides of the partition ring plate at the positions corresponding to each axial flow channel.

2. The central shaft device of a mining disc filter according to claim 1, characterized in that, The wear-resistant ceramic plate has a through hole in the middle. The lower half of the through hole is a conical hole and the upper half is a cylindrical hole. A matching stainless steel conical sleeve is fitted inside the conical hole, and a cylindrical pressure cap is installed inside the cylindrical hole. During installation, the wear-resistant ceramic plate is press-welded to the bottom and side of the axial flow channel and the two sides of the partition ring plate through the stainless steel conical sleeve. Then, wear-resistant ceramic adhesive is used to insert the cylindrical pressure cap into the cylindrical hole to achieve a seal.

3. The central shaft device of a mining disc filter according to claim 2, characterized in that, The wear-resistant ceramic plate is designed with different thicknesses, including double-thick ceramic plates and single-thick ceramic plates. Single-thick ceramic plates are welded to both sides of the axial flow channel, and single-thick ceramic plates are welded to both sides of the partition ring plate. The bottom surface of the axial flow channel facing the impact part of the slurry adopts a double-thick ceramic plate, while the bottom surface of the non-impact part adopts a double-layer structure of "metal pad + single-thick ceramic plate". The thickness of the metal pad is equal to the thickness of the single-thick ceramic plate, ensuring that the bottom surface of the entire axial flow channel is flat and smooth.

4. The central shaft device of a mining disc filter according to claim 1, characterized in that, The lower edges of the wear-resistant ceramic plates on both sides of the axial flow channel are pressed against the upper edges of the bottom wear-resistant ceramic plate, forming a "side-pressing-bottom" sealing structure. All gaps between the wear-resistant ceramic plates are filled and compacted with wear-resistant ceramic adhesive to achieve wear-resistant protection of the entire flow channel area and prevent slurry from seeping into the flow channel metal matrix.

5. The central shaft device of a mining disc filter according to claim 1, characterized in that, The radial wear-resistant bushing is a composite bushing assembled from a steel outer bushing, wear-resistant ceramic adhesive, and an inner wear-resistant ceramic tube.

6. The central shaft device of a mining disc filter according to claim 1, characterized in that, The partition ring plate is welded to the middle of the central cylinder. The axial flow channel is formed by welding the flow channel baffle and the flow channel cover plate. The drive end flow channel baffle is welded to the central cylinder on the left side of the partition ring plate, and the non-drive end flow channel baffle is welded to the central cylinder on the right side of the partition ring plate. The drive end and non-drive end flow channel baffles are evenly distributed along the circumference. The drive end and non-drive end flow channel baffles are staggered in the circumferential direction by half the angle of the axial flow channel. The flow channel cover plate is welded to the top surface of two adjacent flow channel baffles, finally forming several axial flow channels with closed fan-shaped cross sections evenly distributed along the circumference.

7. The central shaft device of a mining disc filter according to claim 1, characterized in that, The central shaft is welded with shaft end flanges at both ends for connecting the distribution pad assembly; the central shaft is supported by sliding bearings, and drive end sliding bearing support rings and non-drive end sliding bearing support rings are welded to the central shaft inside the shaft end flanges at both ends for supporting the entire central shaft on the transmission bearing seat; the distribution head is installed on the distribution pad assembly located outside the sliding bearing support rings at both ends.

8. The central shaft device of a mining disc filter according to claim 7, characterized in that, The dispensing pad assembly includes a dispensing pad, a support shaft, and an end cap. The dispensing pad is connected and fixed to the shaft end flange of the central shaft body by fasteners. The support shaft is fixed in the middle of the dispensing pad, and the dispensing head is mounted on the support shaft. An end cap is installed at the end of the support shaft, and the dispensing head is positioned and pressed against the outer end face of the dispensing pad by the end cap.

9. The central shaft device of a mining disc filter according to claim 7, characterized in that, Both the drive end sliding bearing support ring and the non-drive end sliding bearing support ring are designed as a segmented structure. Each sliding bearing support ring consists of 4 segments. The 4 segments are rolled into circles with the same curvature and then assembled on the central shaft. They are then welded together and then welded to the central shaft.

10. The central shaft device of a mining disc filter according to claim 1, characterized in that, The drive end of the central shaft is provided with a gear ring mounting flange, which is fitted onto the central shaft and welded to it. The outer ring of the gear ring mounting flange is machined with a radial positioning surface, an axial positioning surface, and a connecting flange hole. The gear ring mounting flange and the gear ring body flange are positioned by a stop to ensure the coaxiality of the gear ring and the central shaft. The gear ring mounting flange and the gear ring body flange are connected by bolts evenly distributed around the circumference.

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