Disassembling type scraper structure for scraper discharge centrifuge

Abstract

This utility model relates to the field of spiral scrapers, specifically a detachable scraper structure for scraper discharge centrifuges. It includes a base with a tapered shape (smaller at the top, larger at the bottom), on which a scraper assembly is detachably mounted. The scraper assembly has a limiting component, and a flange is fixedly connected to the top of the base. The scraper assembly includes several blades arranged in a circular array. Several dovetail grooves are formed on the base, also arranged in a circular array. Each dovetail groove contains a dovetail block, which is fixedly connected to its corresponding blade. The blades and dovetail blocks are integrally cast or welded together. The limiting component includes several threaded posts located above the base, arranged in a circular array, with their bottom ends fixedly connected to the top of the base. Compared to existing technologies, this patent, by designing the scraper assembly, allows personnel to individually replace worn blades according to their degree of wear.

Description

Technical Field

[0001] This utility model relates to the field of spiral scrapers, specifically a detachable scraper structure for scraper discharge centrifuges. Background Technology

[0002] In the mineral washing and processing, the main semi-finished products after mineral washing are concentrate and middlings. Depending on the process and product requirements, these two semi-finished products are generally dewatered by centrifugation to meet the moisture requirements of qualified products. During the dewatering process, the spiral scraper's main function is to scrape the dewatered product off the screen using a speed difference and to crush large particles. Therefore, the scraper blades on the spiral scraper are prone to wear during use.

[0003] Chinese Patent No. CN206778722U discloses a spiral scraper for a vertical spiral scraper centrifuge, including a scraper hub, blades and a cone. The scraper hub and blades are fixed on the cone. The spiral scraper is equipped with an expansion sleeve, which is tightly fitted with the mounting hole of the scraper hub. A positioning hole is opened on the outside of the mounting hole.

[0004] This invention uses a positioning connection structure with an expansion sleeve tightening fit instead of the keyed positioning connection structure in the prior art, making the spiral scraper easy to assemble and disassemble. Riveting and welding the blade and scraper hub onto the cone body reduces the manufacturing cost of the spiral scraper. Adding wear-resistant plates to the stress surface of the blade improves its wear resistance and extends its service life. However, the spiral scraper in the existing vertical spiral scraper discharge centrifuge has the following drawbacks during operation:

[0005] The blades and cones of the existing device are welded together, and the entire device needs to be replaced after local wear, which increases maintenance costs. Utility Model Content

[0006] This utility model aims to provide a detachable scraper structure for scraper discharge centrifuges, mainly to solve the technical problems of existing technologies where the blades are welded to the cone, requiring overall replacement after local wear, which increases maintenance costs.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0008] A detachable scraper structure for a scraper discharge centrifuge includes a base that is conical in shape, with a smaller upper part and a larger lower part. A scraper assembly is detachably mounted on the base. A limit component is provided on the scraper assembly. A flange is fixedly connected to the top of the base.

[0009] The working principle and beneficial effects of this utility model:

[0010] 1. Working principle: The scraper assembly is detachably installed on the conical base by the dovetail groove snap-fit. The limiting component prevents the scraper assembly from loosening or shifting under the impact of scraping material and centrifugal force, ensuring that the scraper assembly works stably during high-speed rotation.

[0011] 2. Beneficial effects:

[0012] (1) Existing technology reduces the manufacturing cost of spiral scrapers by riveting the blade and scraper hub onto the cone. However, the blade of the above-mentioned existing device is welded to the cone. After local wear, the whole device needs to be replaced, which increases the maintenance cost. This solution sets up a scraper assembly so that personnel can replace the worn blade individually according to the different degrees of wear.

[0013] (2) This solution sets a limiting component so that the limiting component can limit the scraper assembly and prevent it from loosening under high speed.

[0014] Preferably, the scraper assembly includes several blades arranged in a circular array. The base has several dovetail grooves arranged in a circular array. Each dovetail groove contains a dovetail block, which is fixedly connected to the corresponding blade. The multiple blades are arranged in a circular array to ensure that the scraper scrapes material evenly on the inner wall of the centrifuge drum with balanced force. The dovetail grooves on the base fix the blades through the dovetail blocks. The self-locking property of the dovetail structure prevents the blades from coming out radially, while allowing for quick axial disassembly and assembly. The modular design facilitates the replacement of damaged blades and reduces maintenance costs.

[0015] Preferably, the blade and the dovetail block are integrally cast or welded together. The blade and the dovetail block are integrally formed or welded to ensure connection strength and high-precision positioning, avoid the risk of bolt loosening, enhance overall rigidity, and adapt to the high vibration conditions of the centrifuge.

[0016] Preferably, the limiting component includes a plurality of threaded posts located above the base. The plurality of threaded posts are arranged in a circular array. The bottom end of the threaded posts is fixedly connected to the top end of the base. A positioning ring is provided above the base. The positioning ring has a plurality of first through holes arranged at equal intervals. The threaded posts pass through the corresponding first through holes and extend to the outside. An internal threaded sleeve is threadedly connected to the threaded post. The circularly distributed threaded posts are vertically fixed to the base, serving as the support skeleton for the positioning ring. The positioning ring is sleeved on the threaded posts through the first through holes, constraining the circumferential displacement of the blade assembly. Rotating the sleeve presses the positioning ring, thereby fixing the blade axially, providing adjustable clamping force, and ensuring stable operation of the blade assembly.

[0017] Preferably, an anti-slip ring is provided below the positioning ring, and the anti-slip ring has several second through holes arranged at equal intervals. The threaded post passes through the corresponding second through holes and extends to the outside. The bottom surface of the anti-slip ring is in close contact with and abuts against the top surface of the dovetail block. The anti-slip ring is located below the positioning ring and is sleeved on the threaded post. Its bottom surface is in close contact with the top surface of the dovetail block, which increases the frictional resistance and prevents the blade from rotating or moving under vibration; it also disperses the clamping force, protects the surface of the dovetail block, enhances the vibration resistance of the system, and extends the blade life.

[0018] Preferably, the bottom end of the internal threaded sleeve is provided with a snap-fit ​​groove, in which a sealing ring is snapped. The sealing ring is tightly fitted and abuts against the top surface of the positioning ring. The snap-fit ​​groove at the bottom of the sleeve is embedded with the sealing ring, and after being pressed, it is sealed and fitted with the top surface of the positioning ring to prevent materials or liquids in the centrifuge from seeping into the gap of the threaded column, avoid corrosion or blockage, maintain the cleanliness of the threads, and ensure long-term disassembly and assembly flexibility.

[0019] Preferably, a fixing ring is fixedly connected to the bottom end of the base, and the bottom end of the dovetail block is closely attached to and abuts against the top surface of the fixing ring. The fixing ring is connected to the bottom of the base, and the bottom end of the dovetail block abuts against its top surface to bear the axial cutting reaction force of the blade and avoid deformation of the dovetail block under force; the auxiliary dovetail groove constrains the radial displacement of the blade, improves the overall structural rigidity, and ensures the stability of the scraper operation. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the detachable scraper structure for a scraper discharge centrifuge according to this utility model patent.

[0021] Figure 2 This is a three-dimensional structural diagram of the base of the detachable scraper structure for the scraper discharge centrifuge of this utility model patent.

[0022] Figure 3 This is an exploded view of the scraper assembly area of ​​the detachable scraper structure for a scraper discharge centrifuge according to this utility model patent.

[0023] Figure 4 This is a cross-sectional view of the positioning ring area of ​​the detachable scraper structure for the scraper discharge centrifuge of this utility model patent;

[0024] Figure 5 This is a cross-sectional view of the internal threaded sleeve area of ​​the detachable scraper structure for the scraper discharge centrifuge of this utility model patent.

[0025] The reference numerals in the accompanying drawings include: 1. Base; 2. Blade; 3. Dovetail groove; 4. Dovetail block; 5. Retaining ring; 6. Threaded post; 7. Positioning ring; 8. Anti-slip ring; 9. First through hole; 10. Second through hole; 11. Internal threaded sleeve; 12. Snap-fit ​​groove; 13. Sealing ring; 14. Flange. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figures 1-5 As shown, the scraper discharge centrifuge uses a detachable scraper structure, including a base 1 that is conical in shape with a smaller upper part and a larger lower part. A scraper assembly is detachably mounted on the base 1. The scraper assembly includes several blades 2 arranged in a circular array. Several dovetail grooves 3 are formed on the base 1 and arranged in a circular array. Each dovetail groove 3 has a dovetail block 4 engaged, and the dovetail block 4 is fixedly connected to the corresponding blade 2. The blade 2 and the dovetail block 4 are integrally cast or welded together. The scraper assembly is provided with a limit component, which includes several threaded posts. 6. Threaded posts 6 are located above the base 1. Several threaded posts 6 are arranged in a circular array. The bottom end of the threaded posts 6 is fixedly connected to the top end of the base 1. A positioning ring 7 is provided above the base 1. The positioning ring 7 has several first through holes 9 arranged at equal intervals. The threaded posts 6 pass through the corresponding first through holes 9 and extend to the outside. An internally threaded sleeve 11 is threadedly connected to the threaded posts 6. An anti-slip ring 8 is provided below the positioning ring 7. The anti-slip ring 8 has several second through holes 10 arranged at equal intervals. The threaded posts 6 pass through the corresponding second through holes 10 and extend to the outside. Extending outwards, the bottom surface of the anti-slip ring 8 is tightly fitted and abuts against the top surface of the dovetail block 4. The bottom end of the internally threaded sleeve 11 has a snap-fit ​​groove 12, within which a sealing ring 13 is snapped. The sealing ring 13 is tightly fitted and abuts against the top surface of the positioning ring 7. A fixing ring 5 is fixedly connected to the bottom end of the base 1. The bottom end of the dovetail block 4 is tightly fitted and abuts against the top surface of the fixing ring 5. A flange 14 is fixedly connected to the top end of the base 1. With the conical base 1 as its core, the dovetail blocks 4, integrally formed with the blade 2, are snapped into the annular array of dovetail grooves 3. This is achieved through the dovetail structure... Radial self-locking enables modular quick-release of the blade; the fixing ring 5 at the bottom of the base 1 abuts against the bottom of the dovetail block 4, and the tapered structure enhances rigidity and constrains the blade height; the annular threaded column 6 fixed at the top of the base 1 passes through the second through hole 10 of the anti-slip ring 8 and the first through hole 9 of the positioning ring 7, and the sealing ring 13 is pressed and locked by the internal threaded sleeve 11, so that the bottom surface of the anti-slip ring 8 presses against the top surface of the dovetail block 4 to prevent rotation and the positioning ring 7 to prevent swaying, forming a triple anti-vibration limit; the top flange 14 realizes standardized connection, and solves the problems of low blade replacement efficiency, insufficient rigidity and high-speed loosening.

[0028] As can be seen from the above, the specific embodiments of this utility model are as follows:

[0029] After the centrifuge starts, the entire scraper structure, as a whole, is connected to the centrifuge drive shaft via the top flange 14 and rotates at high speed inside the drum. When unloading is required, the hydraulic or pneumatic system pushes the entire scraper structure close to the filter cake layer on the inner wall of the drum. The cutting edge of the blade 2 cuts into the filter cake, and under the action of axial movement of the scraper or relative rotation of the drum, the filter cake is scraped off and guided to the discharge port through the conical inclined surface of the base 1. The bottom end of the dovetail block 4 tightly abuts against the top surface of the fixing ring 5. The fixing ring 5 is fixedly connected to the base 1, providing solid axial downward support for the entire scraper assembly, resisting the upward impact force and axial component caused by centrifugal force generated during scraping. The bottom surface of the anti-slip ring 8 is tightly pressed against all the dovetail blocks. On the top surface of the dovetail block 4, the positioning ring 7 is located above the anti-slip ring 8. The internal threaded sleeve 11 is screwed onto the threaded post 6, and its bottom end applies downward pressure. The pressure of the internal threaded sleeve 11 is transmitted to the top surface of the positioning ring 7 through the sealing ring 13 at its bottom. The positioning ring 7 then transmits the pressure downward to the anti-slip ring 8. After the anti-slip ring 8 is subjected to downward pressure, a huge static friction force is generated between its bottom surface and the top surface of the dovetail block 4. This friction force effectively prevents the dovetail block 4 and the blade 2 from having any radial or circumferential sliding tendency in the dovetail groove 3. Especially when subjected to uneven scraping reaction force and centrifugal force, the sealing ring 13 deforms under pressure and tightly fits the top surface of the positioning ring 7 and the bottom surface of the snap-fit ​​groove of the internal threaded sleeve 11. To prevent material or cleaning fluid from seeping into the gap between the scraper assembly and the base from the threaded column area, all blades 2 are firmly "clamped" in the dovetail groove 3 of the base 1 by their dovetail blocks 4, supported by the bottom fixing ring 5 and locked by the strong friction of the top anti-slip ring 8. The entire scraper assembly and the base 1 form a solid whole, capable of withstanding the centrifugal force of high-speed rotation and the severe scraping impact. When it is necessary to disassemble the scraper assembly, each internal threaded sleeve 11 is loosened by rotating counterclockwise one by one, so that it moves upward along the threaded column 6. When the internal threaded sleeve 11 moves upward to a certain height, its downward pressing force on the sealing ring 13, positioning ring 7 and anti-slip ring 8 is completely released, and the sealing ring 13 rebounds. At this time, the fixing ring 7 and anti-slip ring 8 are completely released. The positioning ring 7 and anti-slip ring 8 are no longer compressed and can be easily lifted and removed along the threaded post 6. After removing the anti-slip ring 8, the top surface of the dovetail block 4 is no longer constrained, and the friction lock between it and the base 1 disappears. Due to the presence of the fixing ring 5 at the bottom of the dovetail groove 3, the blade 2 together with the dovetail block 4 cannot fall directly downwards. It is necessary to pull the individual blade 2 and dovetail block 4 combination radially upwards. The dovetail block 4 will slide radially outwards along the trajectory of the dovetail groove 3 where it is located until it is completely free from the constraint of the dovetail groove 3. Take out all the blade 2 and dovetail block 4 combinations in sequence. All the blade 2 and dovetail block 4 are removed, and the base 1 is left in place. The blades can be inspected, replaced, cleaned, or the base dovetail groove can be cleaned and maintained.

[0030] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall 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 detachable scraper structure for a scraper discharge centrifuge, comprising a base (1) that is conical in shape with a smaller upper part and a larger lower part, characterized in that: A scraper assembly is detachably mounted on the substrate (1), and a limit component is provided on the scraper assembly. A flange (14) is fixedly connected to the top of the substrate (1). The limiting component includes several threaded posts (6), which are located above the base (1). The several threaded posts (6) are arranged in a ring array. The bottom end of the threaded post (6) is fixedly connected to the top end of the base (1). A positioning ring (7) is provided above the base (1). Several first through holes (9) are provided on the positioning ring (7) at equal intervals. The threaded post (6) passes through the corresponding first through hole (9) and extends to the outside. An internal threaded sleeve (11) is threadedly connected to the threaded post (6).

2. The detachable scraper structure for a scraper discharge centrifuge according to claim 1, characterized in that: The scraper assembly includes several blades (2), which are arranged in a circular array. Several dovetail grooves (3) are provided on the base (1), which are arranged in a circular array. Each dovetail groove (3) is fitted with a dovetail block (4), which is fixedly connected to the corresponding blade (2).

3. The detachable scraper structure for a scraper discharge centrifuge according to claim 2, characterized in that: The blade (2) and the dovetail block (4) are integrally cast or welded together.

4. The detachable scraper structure for a scraper discharge centrifuge according to claim 1, characterized in that: An anti-slip ring (8) is provided below the positioning ring (7). Several second through holes (10) are provided on the anti-slip ring (8) at equal intervals. The threaded post (6) passes through the corresponding second through hole (10) and extends to the outside. The bottom surface of the anti-slip ring (8) is closely attached to and abuts against the top surface of the dovetail block (4).

5. The detachable scraper structure for a scraper discharge centrifuge according to claim 1, characterized in that: The bottom end of the internal threaded sleeve (11) is provided with a snap-fit ​​groove (12), and a sealing ring (13) is snapped into the snap-fit ​​groove (12). The sealing ring (13) is tightly attached to and abuts against the top surface of the positioning ring (7).

6. The detachable scraper structure for a scraper discharge centrifuge according to claim 2, characterized in that: The bottom end of the base (1) is fixedly connected to a fixing ring (5), and the bottom end of the dovetail block (4) is closely attached to and abuts against the top surface of the fixing ring (5).

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