Central shaft structure of a disc filter for tailings

Abstract

The present invention introduces a central axis structure of a large disc filter for tailings, including a shaft body, a spacer ring plate, a wear-resistant bushing, a collar, an end cover, a non-driving end support shaft, a driving end support shaft and an end distribution pad; the spacer ring plate is arranged on the outer edge of the middle part of the shaft body, and the wear-resistant bushing is respectively arranged in each flow channel of the shaft body; a number of collars are evenly spaced and arranged on the outer edge of the shaft body; the end covers are respectively arranged in both ends of the central tube body; the non-driving end support shaft and the driving end support shaft are both arranged on the two end covers by bolts; and the end distribution pads are respectively arranged on both ends of the shaft body. The present invention ensures the overall strength of the shaft body, simplifies the processing procedures, shortens the processing cycle, and is easy to install; improves the wear resistance and corrosion resistance of the shaft body, extends the service life of the shaft body, ensures uniform air volume in the filter discs at the ends and the middle of the shaft body, and facilitates unloading; the two-stage setting of the shaft body can meet the requirements of separate unloading on both sides without cross-flow of air, and high unloading efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of disc filters, in particular to a central axis structure of a large disc filter for tailings. Background Art

[0002] The main process flow of tailings dry stacking is generally thickening + filtration / filter pressing. Generally, a high-efficiency thickener is used, that is, multi-stage thickening is supplemented by the effect of flocculants to increase the tailings concentration by 50%-60%. The tailings are then subjected to vacuum filtration or filter pressing to maximize the solid-liquid separation of the slurry, thereby obtaining a filter cake with a moisture content of less than 20%, which is then transported to the tailings pond by a belt conveyor for dry storage.

[0003] Tailings filtration equipment mainly includes filters and filter presses. With the large-scale mining, ordinary filter presses and filters can no longer meet the needs of modern tailings treatment. Especially in large-scale metal beneficiation plants abroad, in order to reduce the number of equipment, reduce operating costs and improve dehydration efficiency, stable and reliable large-scale disc filters are urgently needed.

[0004] The center shaft is a key component of a large disc filter. The filter disc assembly, distribution head, and transmission are mounted on it. When the main shaft rotates, the filter discs rotate with it, adsorbing the slurry. High-velocity filtrate is transported through the center shaft's flow channel to the distribution heads on both ends. The tailings slurry has a strong impact on the flow channel, which can easily cause wear. If the center shaft is worn, poor wear resistance, and poor sealing performance will lead to cross-flow of air between channels, causing large amounts of slurry to leak, requiring extensive maintenance, affecting the operation of the entire equipment system, and causing serious economic losses. As the channel for vacuum suction, filtrate discharge, compressed air, and water for filter cloth regeneration, the center shaft flow channel needs to be wear-resistant, stable, reliable, and have a long service life to prevent impact and wear on the center shaft from the slurry.

[0005] The shaft body of the existing large-scale mining filter center shaft mostly adopts a welded structure, and the small shafts at both ends are forged and combined with the central tube of the central shaft body through heat installation. The subsequent flow channel welding work can only be carried out after the small shaft and the central tube are assembled as one. The disadvantage is that the processing cycle is long and annealing cannot be performed to eliminate stress; and there is no wear-resistant treatment in the flow channel, which is very easy to wear, seriously affecting the life of the central shaft; and as the filter becomes larger, the shaft body length becomes longer and longer, and a large amount of air is required for simultaneous blowing and unloading on both sides. During use, there is a situation where the air volume does not reach the few discs near the middle of the shaft body when blowing and unloading, and the air volume distribution is uneven, which is not conducive to cake unloading and affects the normal use of the filter. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a central axis structure of a large disc filter for tailings, which is highly wear-resistant, stable and reliable, has a long service life, a short processing cycle, and requires less spare parts replacement.

[0007] The technical solution adopted in the present invention is:

[0008] A central shaft structure of a large disc filter for tailings, comprising a shaft body, a spacer ring plate, a wear-resistant bushing, a collar, an end cover, a non-driving end support shaft, a driving end support shaft and an end distribution pad;

[0009] The shaft body includes a central tube body, vertical ribs and a top plate; the spacer ring plate is arranged on the outer edge of the middle part of the central tube body, dividing the central tube body into two sections, and a plurality of vertical ribs are evenly arranged on the outer edges of the two sections of the central tube body in a radial pattern along the circumferential direction of the central tube body. The outer ends of the two groups of vertical ribs on the outer edges of the two sections of the central tube body are respectively flush with the two ends of the central tube body, and the inner ends are respectively arranged perpendicular to the annular surfaces on both sides of the spacer ring plate. The two groups of vertical ribs are staggered on the two sections of the central tube body; the top plate is arranged between two adjacent vertical ribs, and the top plate, vertical ribs and spacer ring plate together form a plurality of flow channels with trapezoidal cross sections;

[0010] The wear-resistant bushing is a tubular structure with a trapezoidal cross section that matches the flow channel. The outer end of the wear-resistant bushing is open and the inner end is closed. The wear-resistant bushing is respectively arranged in each flow channel of the shaft body. A partition plate is arranged in the wear-resistant bushing. The partition plate extends inward from the outer end of the wear-resistant bushing. The length of the partition plate is less than the length of the wear-resistant bushing; a plurality of collars are evenly spaced on the outer edge of the shaft, and a plurality of filter plate mounting holes of the filter disc are evenly arranged on the circumference of the collar; each wear-resistant bushing and the top plate are provided with through holes that penetrate to the wear-resistant bushing at positions corresponding to the filter plate mounting holes;

[0011] The end covers are circular plates that match the inner diameter of the central tube body of the shaft body, and the end covers are respectively arranged inside the two ends of the central tube body; the non-driving end support shaft and the driving end support shaft are both arranged on the two end covers by bolts; the end distribution pads are annular plates, and the end distribution pads are respectively arranged on the two ends of the shaft body, and the inner rings of the two end distribution pads match the outer diameters of the non-driving end support shaft and the driving end support shaft respectively, and the end distribution pads are both fastened to the end covers by bolts, and the annular surface of the end distribution pad is provided with trapezoidal holes corresponding to the outer ends of each wear-resistant bushing in the shaft body.

[0012] Specifically, the wear-resistant bushing is made of ultra-high molecular polyethylene, and the four corners of the wear-resistant bushing are all arranged with arc-shaped transitions. A gap is left between the wear-resistant bushing and the shaft, and the gap is filled with adhesive.

[0013] Specifically, the length of the partition plate is 55%-60% of the length of the wear-resistant bushing, and the partition plate is arranged at a position where the wear-resistant bushing is divided into two cavities with equal cross-sectional areas.

[0014] More specifically, mounting grooves are provided on the inner walls on both sides of the wear-resistant bushing along the length direction, and the partition plate is arranged in the wear-resistant bushing through the mounting grooves.

[0015] Specifically, flanges for connecting to end distribution pads are provided on both ends of the shaft, and the end distribution pads and the flanges are fastened together by bolts.

[0016] Specifically, the middle part of the outer side surface of the end cover is provided with a step installation groove matching the non-driving end support shaft and the driving end support shaft, so as to facilitate the positioning and installation of the non-driving end support shaft and the driving end support shaft.

[0017] The central axis structure of the large disc filter for tailings of the present invention is characterized by vertical ribs and a top plate of the shaft body being welded to the central tube body, and fan-shaped filter plates being installed in the filter plate mounting holes on each collar to form each filter disc; when the filter is working, the filtrate inside the filter plate enters the wear-resistant bushing inside the shaft body from the filter plate mounting holes, flows out from the outer end of the wear-resistant bushing through the holes on the end distribution pad and enters the distribution heads at both ends; when unloading, air is blown from the distribution head to the filter disc through each wear-resistant bushing; since a partition plate is provided in the wear-resistant bushing, the cross-sectional areas of the upper and lower cavities are equal, and the air volume in the upper part of the wear-resistant bushing preferentially reaches the disc surface close to the distribution head, and the air volume in the lower part directly enters the disc surfaces close to the center of the shaft body, so that the air blowing is uniform and unloading is convenient.

[0018] Due to the adoption of the above technical solution, the present invention has the following advantages:

[0019] The non-driving end support shaft and the driving end support shaft of the present invention are integrated with the shaft body through a connecting bolt group, thereby ensuring overall strength, simplifying the processing process, shortening the processing cycle, and facilitating installation;

[0020] The wear-resistant bushing is made of ultra-high molecular polyethylene material, which improves the wear resistance and corrosion resistance of the shaft and extends the service life of the shaft. It is light in weight, has a large opening area, and is perfectly matched with the special-shaped shaft flow channel. The gap between the flow channel and the wear-resistant bushing is filled with adhesive to make it bonded and tightly bonded to the shaft, with good sealing to ensure no leakage and prevent air from crossing between the flow channels. The partition plate set in the wear-resistant bushing improves the strength of the bushing, and the cross-sectional areas of the upper and lower cavities of the flow channel in the wear-resistant bushing are uniform and smooth, which divides the air volume and ensures uniform air volume in the filter discs at the end and middle of the shaft, making unloading convenient. The end distribution pad is made of wear-resistant steel plate, which reduces the replacement rate of spare parts and saves costs. The two-stage setting of the shaft can meet the requirements of separate unloading on both sides without air crossing, high unloading efficiency, which is conducive to reducing the maximum instantaneous air volume used for blowing unloading and solving the problem of uneven distribution of compressed air on both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an overall schematic diagram of the invention.

[0022] Figure 2 It is a schematic diagram of a cross-section of the shaft body of the present invention.

[0023] Figure 3 It is a partial cross-sectional schematic diagram of the shaft body of the present invention.

[0024] Figure 4 It is a cross-sectional schematic diagram of the wear-resistant bushing of the present invention installed in the flow channel of the shaft.

[0025] Figure 5 Schematic diagram of the wear-resistant bushing of the present invention.

[0026] In the figure: 1-shaft body, 11-center tube body, 12-vertical rib, 13-top plate, 2-spacer ring plate, 3-wear-resistant bushing, 31-partition plate, 32-installation slot, 4-collar, 5-end cover, 6-non-drive end support shaft, 7-drive end support shaft, 8-end distribution pad, 9-flange. DETAILED DESCRIPTION

[0027] The present invention will be further explained below with reference to the accompanying drawings and embodiments, which should not be used to limit the scope of protection of the present invention. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0028] Combined with attachment Figure 1-5 The central shaft structure of a large disc filter for tailings shown includes a shaft body 1, a spacer ring plate 2, a wear-resistant bushing 3, a collar 4, an end cover 5, a non-drive end support shaft 6, a drive end support shaft 7, an end distribution pad 8 and a flange 9.

[0029] The shaft body 1 includes a central tube body 11, vertical ribs 12 and a top plate 13; the spacer ring plate 2 is arranged on the outer edge of the middle part of the central tube body 11, dividing the central tube body 11 into two sections, and a number of vertical ribs 12 are evenly arranged radially along the circumferential direction of the central tube body 11 on the two outer edges of the central tube body 11. The outer ends of the two groups of vertical ribs 12 on the two outer edges of the central tube body 11 are respectively flush with the two ends of the central tube body 11, and the inner ends are respectively perpendicular to the annular surfaces on both sides of the spacer ring plate 2. The two groups of vertical ribs 12 are staggered on the two sections of the central tube body 11; the top plate 13 is arranged between two adjacent vertical ribs 12, and the top plate 13, the vertical ribs 12 and the spacer ring plate 2 together form a number of flow channels with trapezoidal cross sections.

[0030] The wear-resistant bushing 3 is a tubular structure with a trapezoidal cross-section that matches the flow channel. The outer end of the wear-resistant bushing 3 is open and the inner end is closed. The wear-resistant bushing 3 is respectively arranged in each flow channel of the shaft body 1. Installation grooves 32 are provided on the inner walls on both sides of the wear-resistant bushing 3 along the length direction. The partition plate 31 is arranged in the wear-resistant bushing 3 through the installation groove 32. The partition plate 31 extends inward from the outer end of the wear-resistant bushing 3. The length of the partition plate 31 is 55%-60% of the length of the wear-resistant bushing 3. The partition plate 31 is arranged at a position where the wear-resistant bushing 3 is divided into two cavities with equal cross-sectional areas; the wear-resistant bushing 3 is made of ultra-high molecular polyethylene, and the four corners of the wear-resistant bushing 3 are all arc-shaped transition settings. There is a gap between the wear-resistant bushing 3 and the shaft body 1, and the gap is filled with adhesive.

[0031] Several collars 4 are evenly spaced on the outer edge of the shaft 1, and several filter plate mounting holes of the filter discs are evenly arranged on the circumference of the collars 4; each wear-resistant bushing 3 and the top plate 13 are provided with through holes penetrating to the wear-resistant bushing 3 at positions corresponding to the filter plate mounting holes.

[0032] The end cover 5 is a circular plate that matches the inner diameter of the central tube body 11 of the shaft body 1, and the end covers 5 are respectively arranged in the two ends of the central tube body 11; the non-driving end support shaft 6 and the driving end support shaft 7 are both arranged on the two end covers 5 by bolts; the end distribution pad 8 is an annular plate, and the end distribution pads 8 are respectively arranged on the two ends of the shaft body 1, and the inner rings of the two end distribution pads 8 match the outer diameters of the non-driving end support shaft 6 and the driving end support shaft 7 respectively, and the end distribution pads 8 are fastened to the end cover 5 by bolts, and the annular surface of the end distribution pad 8 is provided with a trapezoidal hole corresponding to the outer end of each wear-resistant bushing 3 in the shaft body 1; the flange 9 is arranged on the two ends of the shaft body 1, and the end distribution pad 8 and the flange 9 are fastened by bolts.

[0033] Preferably, the middle part of the outer side surface of the end cover 5 is provided with a step installation groove that matches the non-driving end support shaft 6 and the driving end support shaft 7, respectively, to facilitate the positioning and installation of the non-driving end support shaft 6 and the driving end support shaft 7.

[0034] The central axis structure of the large disc filter for tailings of the present invention, the vertical ribs 12 and the top plate 13 of the shaft body 1 are welded and arranged on the central tube body 11, and the fan-shaped filter plates are installed in the filter plate mounting holes on each collar 4 to form each filter disc; when the filter is working, the filtrate inside the filter plate enters the wear-resistant bushing 3 in the shaft body 1 from the filter plate mounting hole, flows out from the outer end of the wear-resistant bushing 3 through the holes on the end distribution pad 8 and enters the distribution heads at both ends; when unloading, air is blown from the distribution head through the end distribution pad 8 and each wear-resistant bushing 3 to the filter disc. Since a partition plate 31 is provided in the wear-resistant bushing 3, the cross-sectional areas of the upper and lower cavities are equal. The air volume in the upper part of the wear-resistant bushing 3 first reaches the disc surface close to the distribution head, and the lower air volume directly enters the disc surfaces close to the center of the shaft body 1, so that the blowing is uniform and unloading is convenient.

[0035] The parts not described in detail in this invention are prior art.

[0036] The embodiments selected herein for the purpose of disclosing the invention are presently considered suitable, but it should be understood that the invention is intended to include all variations and modifications of the embodiments that fall within the scope of the concept and invention.

Claims

1. A central axis structure of a large disc filter for tailings, characterized in that: It includes a shaft body, a spacer ring plate, a wear-resistant bushing, a collar, an end cover, a non-drive end support shaft, a drive end support shaft and an end distribution pad; The shaft body includes a central tube body, vertical ribs and a top plate; the spacer ring plate is arranged on the outer edge of the middle part of the central tube body, dividing the central tube body into two sections, and a plurality of vertical ribs are evenly arranged on the outer edges of the two sections of the central tube body in a radial pattern along the circumferential direction of the central tube body. The outer ends of the two groups of vertical ribs on the outer edges of the two sections of the central tube body are respectively flush with the two ends of the central tube body, and the inner ends are respectively arranged perpendicular to the annular surfaces on both sides of the spacer ring plate. The two groups of vertical ribs are staggered on the two sections of the central tube body; the top plate is arranged between two adjacent vertical ribs, and the top plate, vertical ribs and spacer ring plate together form a plurality of flow channels with trapezoidal cross sections; The wear-resistant bushing is a tubular structure with a trapezoidal cross section that matches the flow channel. The outer end of the wear-resistant bushing is open and the inner end is closed. The wear-resistant bushing is respectively arranged in each flow channel of the shaft body. A partition plate is arranged in the wear-resistant bushing. The partition plate extends inward from the outer end of the wear-resistant bushing. The length of the partition plate is less than the length of the wear-resistant bushing; a plurality of collars are evenly spaced on the outer edge of the shaft, and a plurality of filter plate mounting holes of the filter disc are evenly arranged on the circumference of the collar; each wear-resistant bushing and the top plate are provided with through holes that penetrate to the wear-resistant bushing at positions corresponding to the filter plate mounting holes; The end covers are circular plates that match the inner diameter of the central tube body of the shaft body, and the end covers are respectively arranged inside the two ends of the central tube body; the non-driving end support shaft and the driving end support shaft are both arranged on the two end covers by bolts; the end distribution pads are annular plates, and the end distribution pads are respectively arranged on the two ends of the shaft body, and the inner rings of the two end distribution pads match the outer diameters of the non-driving end support shaft and the driving end support shaft respectively, and the end distribution pads are both fastened to the end covers by bolts, and the annular surface of the end distribution pad is provided with trapezoidal holes corresponding to the outer ends of each wear-resistant bushing in the shaft body.

2. The central axis structure of the large disc filter for tailings according to claim 1 is characterized by: The wear-resistant bushing is made of ultra-high molecular polyethylene. The four corners of the wear-resistant bushing are all arranged with arc-shaped transitions. A gap is left between the wear-resistant bushing and the shaft body, and the gap is filled with adhesive.

3. The central axis structure of the large disc filter for tailings according to claim 2 is characterized in that: The length of the partition plate is 55%-60% of the length of the wear-resistant bushing, and the partition plate is arranged at a position where the wear-resistant bushing is divided into two cavities with equal cross-sectional areas.

4. The central axis structure of the large disc filter for tailings according to claim 3 is characterized by: The inner walls on both sides of the wear-resistant bushing are provided with mounting grooves along the length direction, and the partition plate is arranged in the wear-resistant bushing through the mounting grooves.

5. The central axis structure of the large disc filter for tailings according to claim 1 is characterized by: Flanges for connecting to end distribution pads are also provided on both ends of the shaft, and the end distribution pads and the flanges are fastened together by bolts.

6. The central axis structure of the large disc filter for tailings according to claim 1, characterized in that: The middle part of the outer side surface of the end cover is respectively provided with a step installation groove which matches the non-driving end support shaft and the driving end support shaft.

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