Integrated lower housing of horizontal screw centrifuge

Abstract

The integrated lower housing comprises a rotary drum and a housing body, the rotary drum is rotationally arranged in the housing body and comprises a taper section and a straight pipe section, a solid-phase separation cavity is located outside a slag discharging opening of the taper section, the lower side of the solid-phase separation cavity is connected with a solid-phase outlet, and the housing body is provided with an integrated end sealing plate at one end of the solid-phase separation cavity. The end sealing plate forms a mounting side wall on the inner side of the solid-phase separation cavity and is provided with a scraping structure driven by the end part of the taper section of the rotary drum, and the scraping structure scrapes and sweeps the inner wall of the solid-phase separation cavity. According to the utility model, the lower housing and the solid-liquid phase interface of the horizontal screw centrifuge are made into an integrated lower housing structure, so that the liquid leakage of the lower housing can be prevented, the influence on the production environment is avoided, and the leakage risk of the housing is reduced. The scraping structure is arranged in the solid-phase separation cavity, and the original mode that solid sediments in the solid-phase separation cavity fall off due to the dead weight can be improved into active scraping, so that the solid-phase materials can be prevented from blocking the slag discharging opening, and smooth discharging is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to an integrated lower cover shell of a horizontal screw centrifuge. Background Art

[0002] The horizontal screw centrifuge is a processing equipment widely used in solid-liquid separation applications. Its working principle is that the drum and the screw pusher rotate at high speed in the same direction with a certain speed difference. The fluid suspension composed of liquid and solid is continuously introduced into the screw pusher through the feed pipe. After acceleration, it enters the drum. Under the action of centrifugal force, the heavier solids are deposited on the wall of the drum to form a sediment layer. The screw pusher continuously pushes the deposited solids to the conical drum and discharges them through the slag outlet. The resulting clear liquid flows to the other end of the drum and is discharged through the overflow port. After the solids are discharged through the slag outlet, they will be thrown around to the inner surface of the cover and finally discharged from the horizontal screw centrifuge through the solid phase outlet by their own gravity. At the same time, the clear liquid is also discharged from the liquid phase outlet by its own gravity. The cover is an important component of the decanter centrifuge, including the upper cover and the lower cover. The lower cover is fixed to the base. When the decanter centrifuge is operating normally, the upper and lower covers are connected by screws and are in a closed state, covering the rotating parts such as the drum and the screw pusher inside to play a safety protection role. At the same time, the lower cover also separates the separated clear liquid and solids and discharges them out of the decanter centrifuge through the liquid phase outlet and the solid phase outlet respectively.

[0003] In the prior art, a spiral pusher continuously pushes the deposited solids to the conical drum. After being discharged through the slag outlet, the solids are thrown around to the inner surface of the housing and finally discharged from the solid phase outlet of the decanter centrifuge by its own gravity. Since the separated solid materials have a certain humidity, they are thrown onto the inner wall of the housing after centrifugal separation from the drum, forming an adhered accumulation. The accumulation thickness may even adhere to the surface of the drum outlet, thereby blocking the drum outlet and affecting the discharge speed of the solid materials. Secondly, at present, decanter centrifuges widely use independent liquid phase and solid phase outlets. One end is a square flange, which is connected to the lower housing by screws and fixed with a rubber gasket in the middle. The other end is connected to the process pipeline. Usually, the liquid phase outlet uses a standard flange interface, and the solid phase outlet is an open outlet that is not connected to external equipment. In actual use, due to processing errors and deformations in the sealing plane of the square flange between the lower housing and the solid-liquid phase outlet, as well as aging, deformation and failure of the rubber gasket, liquid leakage may occur at the flange connection, affecting the production environment.

[0004] In view of the above, it is necessary to propose an integrated lower cover of a horizontal screw centrifuge to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects in the prior art and provide an integrated lower cover of a horizontal screw centrifuge.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: an integrated lower cover shell of a horizontal screw centrifuge, comprising a drum and a cover shell, the drum being rotatably arranged in the cover shell, the drum comprising a tapered section and a straight pipe section, a spiral being installed in the straight pipe section, a feeding pipe being provided at the end of the straight pipe section, the cover shell being provided with a liquid phase outlet, a solid phase outlet, and a solid phase separation chamber, the solid phase separation chamber being located outside the slag discharge port of the tapered section, the lower side of the solid phase separation chamber being connected to the solid phase outlet, the cover shell being provided with an integral end sealing plate at one end of the solid phase separation chamber, the end sealing plate forming an installation side wall on the inner side of the solid phase separation chamber, the end sealing plate being provided with a scraping structure driven by the end of the tapered section of the drum, the scraping structure scraping the inner wall of the solid phase separation chamber.

[0007] Furthermore, the scraping structure includes a gear ring and a slewing bearing; the gear ring is rotatably connected to the end cover plate through the slewing bearing, and the gear ring is coaxially arranged with the drum. A scraping rod is provided on the gear ring, and the scraping rod cooperates with the inner wall of the solid phase separation chamber.

[0008] Furthermore, an internal gear is meshed with the inner side of the gear ring, a shaft is provided on the end sealing plate, the internal gear is rotatably set on the shaft, a rocker is also provided on the shaft, a roller is rotatably provided at the other end of the rocker, the roller and the internal gear are connected by a transmission chain, and the roller is rollingly connected to the outer wall of the tapered section.

[0009] Furthermore, the rocker arm is rotatably connected with the shaft rod as an axis, and a first elastic member is provided on the shaft rod. The first elastic member is configured to make the end of the rocker arm always have a tendency to move toward the tapered section.

[0010] Furthermore, the slewing bearing includes an outer ring and an inner ring, the outer ring is fixedly arranged on the end sealing plate, the inner ring is rotatably connected inside the outer ring, and the inner wall of the inner ring forms a gear ring.

[0011] Furthermore, the scraping rod is in the shape of a Z-rod, including a rotating rod, a vertical rod, and a scraper. The rotating rod is rotatably set on the gear ring. The vertical rod is connected to one end of the rotating rod and extends to the outside of the gear ring. The outer end of the vertical rod is connected to a scraper.

[0012] Furthermore, a second elastic member is provided on the rotating rod, and a limiting protrusion is provided on the side wall of the gear ring to limit the vertical rod. The second elastic member is configured to make the vertical rod always have a tendency to move toward the limiting protrusion.

[0013] Furthermore, the cover shell includes an upper cover and a lower cover shell, and the upper cover and the lower cover shell enclose the drum therein, and the upper cover shell can be rotated open relative to the lower cover shell, and the upper side of the end sealing plate forms a semicircular sealing edge, and the upper cover shell is provided with a labyrinth sealing splint that matches the shape of the semicircular sealing edge. When the upper cover shell is closed, the labyrinth sealing splint is fitted on both sides of the semicircular sealing edge.

[0014] Furthermore, the liquid phase outlet, the solid phase outlet and the lower cover are integrally welded, the lower end of the liquid phase outlet is a standard flange interface; the lower end of the solid phase outlet is an open outlet or a square flange interface.

[0015] The advantages and beneficial effects of this utility model are as follows: the lower housing of the decanter centrifuge and the solid-liquid interface are integrated into a lower housing structure, which can prevent liquid leakage from the lower housing and affect the production environment, and reduce the risk of housing leakage. A scraping structure is provided in the solid phase separation chamber, which improves the original method of solid sediment falling by its own weight in the solid phase separation chamber to active scraping, thereby preventing solid phase materials from blocking the slag discharge port and facilitating smooth discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the lower cover in the prior art;

[0017] Figure 2 This is a side view of the integrated lower cover of a horizontal screw centrifuge of the utility model;

[0018] Figure 3 This utility model Figure 2 Bottom view of

[0019] Figure 4 It is an isometric view of the second embodiment of the present utility model;

[0020] Figure 5 This is a schematic diagram of the operating direction of each component of the scraper structure of the utility model;

[0021] Figure 6 This is an exploded view of the second embodiment of the present invention;

[0022] In the figure: 1. Tapered section; 2. Straight pipe section; 3. Liquid phase outlet; 4. Solid phase outlet; 5. Solid phase separation chamber; 6. Slag discharge port; 7. End sealing plate; 8. Scraper structure; 9. Ring gear; 10. Rotary bearing; 11. Sweep rod; 12. Internal gear; 13. Shaft; 14. Rocker; 15. Roller; 16. Transmission chain; 17. Outer ring; 18. Inner ring; 19. Rotating rod; 20. Vertical rod; 21. Scraper; 22. Limiting protrusion; 23. Upper cover of the cover; 24. Lower cover; 25. Semicircular sealing edge; 26. Labyrinth sealing splint. DETAILED DESCRIPTION

[0023] The following embodiments are used to further describe the specific embodiments of the present invention in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] Example 1:

[0025] A horizontal screw centrifuge integrated lower cover, including a drum and a cover, the drum is rotatably arranged in the cover, the drum includes a tapered section 1 and a straight pipe section 2, a spiral is installed in the straight pipe section 2, and a feeding pipe is provided at the end of the straight pipe section 2. The cover is provided with a liquid phase outlet 3, a solid phase outlet 4, and a solid phase separation chamber 5. The solid phase separation chamber 5 is located outside the slag discharge port 6 of the tapered section 1, and the lower side of the solid phase separation chamber 5 is connected to the solid phase outlet 4.

[0026] like Figure 1 The figure shows a schematic diagram of the existing structure. The upper ends of the liquid phase outlet 3 and the solid phase outlet 4 are connected to the lower cover 24. The end is a square flange, which is installed and connected to the lower cover 24 by screws and spring washers. A liquid phase sealing gasket and a solid phase sealing gasket are installed in the middle of the square flange. The other end of the liquid phase outlet 3 is a standard flange interface, and the other end of the solid phase outlet 4 adopts an open outlet. When the horizontal screw centrifuge is operating normally, the clear liquid and solid matter are discharged through the liquid phase outlet 3 and the solid phase outlet 4 respectively. However, due to the processing error and deformation of the sealing plane of the lower cover 24 and the square flanges of the liquid phase outlet 3 and the solid phase outlet 4, as well as the aging, deformation and failure of the liquid phase sealing gasket and the solid phase sealing gasket, liquid leakage will occur at the flange connection, affecting the production environment.

[0027] like Figure 2 , is a schematic diagram of the structure of this embodiment. The liquid phase outlet 3 and the lower cover 24 are made into an integrated structure, and the solid phase connection flange of the lower cover 24 is extended to replace the solid phase outlet 4. In this way, it is ensured that the clear liquid and solids can be discharged normally from the decanter centrifuge, and the elimination of the connection flange also avoids liquid leakage. Moreover, the number of flanges helps to avoid the risk of leakage caused by irregularities in the installation of the equipment, and can also avoid the risk of leakage caused by aging of the seal inside the connection installation due to long-term use of the equipment; specifically, Figure 2 、 3 As shown, the liquid phase outlet 3, the solid phase outlet 4 and the lower cover 24 are integrally welded, and the lower end of the liquid phase outlet 3 is a standard flange interface; the lower end of the solid phase outlet 4 is an open outlet or a square flange interface.

[0028] Example 2:

[0029] In the prior art, solids are sent out from the slag discharge port 6 under the centrifugal action of the drum and the driving force of the spiral, so that the solids are collected in the solid phase separation chamber 5. The solids are separated from the liquid and have a certain humidity. After being thrown out, they are very easy to adhere to the inner wall of the solid phase separation chamber 5. After a certain period of use, the solids adhere to and deposit in the solid phase separation chamber 5 and gradually become thicker, and may even stick to the slag discharge port 6, causing the subsequent separation resistance of the solids from the slag discharge port 6 to increase, which has a greater impact on the use of the equipment. As an improvement, the cover is provided with an integral end sealing plate 7 at one end of the solid phase separation chamber 5, such as Figure 2 、 4 As shown, the end sealing plate 7 forms a mounting side wall on the inner side of the solid phase separation chamber 5, and a scraper structure 8 driven by the end of the drum tapered section 1 is provided on the end sealing plate 7, and the scraper structure 8 scrapes the inner wall of the solid phase separation chamber 5. The scraper structure 8 in this embodiment does not need to be provided with a separate driving device. It uses the driving force generated by the rotation of the drum itself to drive the scraper structure 8, and continuously throws the slag discharge port 6 toward the solid matter in the solid phase separation chamber 5 to scrape off. In this embodiment, the integral end sealing plate 7 is used to install and fix the scraper structure 8, and a center hole is provided in the middle of the end sealing plate 7 for the end of the drum to pass through.

[0030] Specifically, such as Figure 4-6 As shown, the scraper structure 8 includes a gear ring 9 and a slewing bearing 10; the gear ring 9 is rotatably connected to the end cover plate 7 through the slewing bearing 10, and the gear ring 9 is coaxially arranged with the drum. The gear ring 9 is provided with a scraping rod 11, and the scraping rod 11 cooperates with the inner wall of the solid phase separation chamber 5. The slewing bearing 10 includes an outer ring 17 and an inner ring 18. The outer ring 17 is fixedly arranged on the end cover plate 7. The outer gear ring 9 is provided with multiple bolt holes around the circumference. Bolts are installed in each bolt hole and fixed to the end cover plate 7 to form a fixed structure. In this way, the gear ring 9 can rotate around one end of the drum under the support of the slewing bearing 10, and the gear ring 9 is coaxially arranged with the drum. Under the action of the slewing bearing 10, the inner ring 18 is rotatably connected to the outer ring 17, and the gear ring 9 is formed on the inner wall of the inner ring 18.

[0031] Furthermore, an internal gear 12 is meshed inside the gear ring 9. In this embodiment, in order to make the rotation more balanced, two internal gears 12 are provided and symmetrically arranged on the upper and lower sides of the gear ring 9. A shaft 13 is provided on the end cover 7. The internal gear 12 is rotatably arranged on the shaft 13. Figure 6 As shown, the shaft 13 is fixedly arranged on the end sealing plate 7, which is the rotating shaft of the internal gear 12. It can be understood that when the internal gear 12 rotates, it can drive the ring gear 9 to rotate, thereby driving the scraping rod 11 to scrape the inner wall of the solid phase separation chamber 5, and then remove the solids at a certain speed.

[0032] Furthermore, a rocker 14 is provided on the shaft 13, and the rocker 14 is rotatably connected with the shaft 13. When the rocker 14 is rotatably connected, the other end of the rocker 14 can be close to the end of the tapered section 1 to obtain the rotational driving force of the drum. Specifically, a roller 15 is rotatably provided at the other end of the rocker 14. Figure 5 As shown, a roller 15 is provided at one end close to the drum, and the roller 15 is connected to the inner gear 12 via a transmission chain 16. The roller 15 is in rolling connection with the outer wall of the tapered section 1. Figure 5 When the direction indicated by the dotted arrow approaches the drum, the roller 15 thereon is in rolling friction contact with the drum, thereby driving the roller 15 to rotate, and the power of the roller 15 is transmitted to the internal gear 12 through the transmission chain 16, thereby driving the ring gear 9 to rotate. It can be understood that by controlling the size of the sprockets at both ends of the roller 15 and the transmission chain 16 to control the transmission ratio, the purpose of deceleration is achieved, and then the ring gear 9 can be controlled to scrape the inner wall of the solid phase separation chamber 5 at a reasonable speed; Figure 5 As shown, the diameter of the roller 15 is smaller than the diameter of the coaxially arranged sprocket, and the diameter of the end sprocket is smaller than the diameter of the sprocket coaxially arranged with the inner ring gear 9, and the diameter of the sprocket on the shaft 13 is larger than the diameter of the inner gear 12, and the diameter of the inner gear 12 is much smaller than the ring gear 9, thereby achieving the purpose of step-by-step deceleration, and then controlling the speed of the ring gear 9 within a reasonable range.

[0033] In order to make the rocker 14 exert a certain pressure on the roller 15, so that the roller 15 maintains a certain pressure rolling contact with the drum to facilitate power transmission; in this embodiment, a first elastic member is provided on the shaft 13, and the first elastic member is configured to make the end of the rocker 14 always have a tendency to move toward the tapered section 1; when in use, a torsion spring can be provided on the shaft 13, and the elastic torque of the torsion spring can be used to drive the rocker 14 to squeeze toward the drum, such as Figure 5 Indicated by the dotted arrow.

[0034] When the power is transmitted from the drum to the gear ring 9, the inner wall of the solid phase separation chamber 5 is cleaned by the scraping rod 11 provided on the gear ring 9. Figure 5 、 6As shown, the scraping rod 11 device provided on the gear ring 9 is also symmetrically provided in two groups, thereby increasing the frequency of scraping and achieving a symmetrical arrangement. Specifically, the scraping rod 11 is in the shape of a Z-shaped rod, comprising a rotating rod 19, a vertical rod 20, and a scraper 21. The rotating rod 19 is rotatably provided on the gear ring 9. In this embodiment, for example, to facilitate the installation of the rotating rod 19, a mounting plate is provided on the side of the gear ring 9, and the rotating rod 19 of the scraping rod 11 is rotatably installed on the mounting plate. The vertical rod 20 is connected to one end of the rotating rod 19 and extends to the outside of the gear ring 9. The outer end of the vertical rod 20 is connected to a scraper 21. The vertical rod 20 allows the scraper 21 to be extended and provided on the periphery of the gear ring 9, thereby facilitating the scraper 21 to scrape the inner wall of the solid phase separation chamber 5.

[0035] Similar to the arrangement of the rocker arm 14, a second elastic member is provided on the rotating rod 19, and a limiting protrusion 22 is provided on the side wall of the gear ring 9 to limit the position of the vertical rod 20. The second elastic member is configured to make the vertical rod 20 always have a tendency to move toward the limiting protrusion 22. Figure 5 As shown, under the drive of the second elastic member, the vertical rod 20 moves along Figure 5 The scraper 21 is swung in the counterclockwise direction indicated by the dotted arrow, so that the scraper 21 can maintain a certain elastic pressure and stick to the inner wall of the solid phase separation chamber 5 for scraping. In addition, since the cover shell includes a cover shell upper cover 23 and a lower cover shell 24, the cover shell upper cover 23 and the lower cover shell 24 enclose the drum therein, and the cover shell upper cover 23 can be rotated and opened relative to the lower cover shell 24. The cover shell upper cover 23 is flipped open for disassembly and maintenance of the entire equipment. In order to prevent the vertical rod 20 from excessively rotating under the action of the second elastic member after the cover shell upper cover 23 is opened, a limiting protrusion 22 is provided to block it, so that when the cover shell upper cover 23 is opened, the vertical rod 20 will not cross the center line position. When the cover shell upper cover 23 is closed again, the scraper 21 can be reset to the original state of maintaining pressure and scraping.

[0036] Furthermore, a semicircular sealing edge 25 is formed on the upper side of the end sealing plate 7, and the housing cover 23 is provided with a labyrinth sealing splint 26 that matches the shape of the semicircular sealing edge 25. When the housing cover 23 is closed, the labyrinth sealing splint 26 is attached to both sides of the semicircular sealing edge 25. Figure 6 As shown, in order to maintain the sealing of the cover, when the cover is closed, the semicircular sealing edge 25 of the cover upper cover 23 is correspondingly inserted into the labyrinth sealing splint 26 to form a seal with a labyrinth sealing effect to prevent material from leaking from there during operation. It can be understood that a sealing gasket can also be added to the labyrinth sealing splint 26 to improve the sealing effect.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An integrated lower casing of a horizontal screw centrifuge, comprising a drum and a casing, wherein the drum is rotatably arranged in the casing, wherein the drum comprises a tapered section (1) and a straight pipe section (2), wherein a spiral is installed in the straight pipe section (2), and a feeding pipe is provided at the end of the straight pipe section (2), wherein the casing is provided with a liquid phase outlet (3), a solid phase outlet (4), and a solid phase separation chamber (5), wherein the solid phase separation chamber (5) is located outside the slag discharge port (6) of the tapered section (1), and the lower side of the solid phase separation chamber (5) is connected to the solid phase outlet (4), characterized in that: The housing is provided with an integral end sealing plate (7) at one end of the solid phase separation chamber (5), the end sealing plate (7) forming a mounting side wall on the inner side of the solid phase separation chamber (5), and a scraping structure (8) driven by the end of the drum tapered section (1) is provided on the end sealing plate (7), the scraping structure (8) scraping the inner wall of the solid phase separation chamber (5).

2. The integrated lower cover of a decanter centrifuge according to claim 1, characterized in that: The scraping structure (8) includes a gear ring (9) and a slewing bearing (10); the gear ring (9) is rotatably connected to the end sealing plate (7) through the slewing bearing (10), and the gear ring (9) is coaxially arranged with the rotating drum. A scraping rod (11) is provided on the gear ring (9), and the scraping rod (11) cooperates with the inner wall of the solid phase separation chamber (5).

3. The integrated lower cover of a decanter centrifuge according to claim 2, characterized in that: An internal gear (12) is meshed with the inner side of the gear ring (9), a shaft (13) is provided on the end sealing plate (7), the internal gear (12) is rotatably arranged on the shaft (13), a rocker (14) is further provided on the shaft (13), a roller (15) is rotatably provided at the other end of the rocker (14), the roller (15) is connected to the internal gear (12) via a transmission chain (16), and the roller (15) is in rolling connection with the outer wall of the tapered section (1).

4. The integrated lower cover of a decanter centrifuge according to claim 3, characterized in that: The rocker (14) is rotatably connected with the shaft (13), and a first elastic member is provided on the shaft (13). The first elastic member is configured to ensure that the end of the rocker (14) always has a tendency to move toward the tapered section (1).

5. The integrated lower cover of a decanter centrifuge according to claim 2, characterized in that: The slewing bearing (10) includes an outer ring (17) and an inner ring (18). The outer ring (17) is fixedly arranged on the end sealing plate (7). The inner ring (18) is rotatably connected inside the outer ring (17). The inner wall of the inner ring (18) forms a gear ring (9).

6. The integrated lower cover of a decanter centrifuge according to claim 2, characterized in that: The scraping rod (11) is in a Z-shaped rod shape and comprises a rotating rod (19), a hanging rod (20), and a scraper (21). The rotating rod (19) is rotatably arranged on the gear ring (9). The hanging rod (20) is connected to one end of the rotating rod (19) and extends to the outside of the gear ring (9). The outer end of the hanging rod (20) is connected to the scraper (21).

7. The integrated lower cover of a decanter centrifuge according to claim 6, characterized in that: A second elastic member is provided on the rotating rod (19), and a limiting protrusion (22) is provided on the side wall of the gear ring (9) for limiting the position of the vertical rod (20). The second elastic member is configured to make the vertical rod (20) always have a tendency to move toward the limiting protrusion (22).

8. The integrated lower cover of a decanter centrifuge according to claim 1, characterized in that: The housing comprises an upper housing cover (23) and a lower housing cover (24), wherein the upper housing cover (23) and the lower housing cover (24) enclose the drum. The upper cover (23) of the housing can be rotated and opened relative to the lower housing (24); a semicircular sealing edge (25) is formed on the upper side of the end sealing plate (7); the upper cover (23) of the housing is provided with a labyrinth sealing splint (26) that matches the shape of the semicircular sealing edge (25); when the upper cover (23) of the housing is closed, the labyrinth sealing splint (26) is attached to both sides of the semicircular sealing edge (25).

9. The integrated lower casing of a decanter centrifuge according to claim 2, characterized in that: The liquid phase outlet (3), the solid phase outlet (4) and the lower cover (24) are integrally welded and connected. The lower end of the liquid phase outlet (3) is a flange interface; the lower end of the solid phase outlet (4) is an open outlet or a square flange interface.

Images