Horizontal screw type sedimentation centrifugal dehydrator for screening and dehydrating slurry

Abstract

The invention discloses a horizontal screw type sedimentation centrifugal dehydrator for screening and dehydrating slurry. The horizontal screw type sedimentation centrifugal dehydrator comprises a rotary drum suite, the spiral pusher is coaxially arranged in the rotary drum sleeve piece and rotates at a differential speed relative to the rotary drum sleeve piece; the driving device is used for driving the rotary drum suite and the spiral pusher to rotate; the feeding device is used for conveying to-be-treated slurry into the rotary drum suite; the liquid phase discharge port is formed in the end part of the rotary drum kit and is used for discharging the separated liquid phase; the solid phase discharging opening is formed in the other end part of the rotary drum kit and is used for discharging the separated solid phase; and the vibration screening device is arranged on one side of the feeding device, the feeding end of the vibration screening device is used for receiving the original slurry, remaining impurities are screened on a screen of the vibration screening device, and an outlet below the screen of the vibration screening device communicates with a feeding port of the rotary drum kit. The effect of preventing the hard impurities from directly entering the rotary drum to cause serious abrasion of the spiral blades or the inner wall of the rotary drum and even cause equipment blockage or mechanical damage is achieved.

Description

Technical Field

[0001] This invention belongs to the technical field of horizontal screw centrifugal dewatering machines, and in particular, a horizontal screw sedimentation centrifugal dewatering machine for mud screening and dewatering. Background Technology

[0002] The horizontal screw centrifuge (or simply horizontal screw centrifuge) is a solid-liquid separation device widely used in environmental protection, chemical, food, and mining industries. Its basic working principle utilizes the powerful centrifugal force generated by the high-speed rotating drum to rapidly separate solid particles and liquid phases of different densities within the drum. A screw conveyor, coaxial with the drum but rotating at a different speed, continuously pushes the settled solid phase towards the conical end of the drum for discharge, while the clarified liquid phase overflows from the column end of the drum, thus achieving continuous and efficient dewatering and separation of materials. With its large processing capacity, high degree of automation, and excellent separation effect, this equipment has become a core component for treating complex slurries such as sludge and industrial wastewater.

[0003] However, in practical applications, especially when processing raw slurry containing a large amount of coarse particles (such as construction slurry, river dredging slurry, and some industrial wastewater sludge), existing horizontal screw centrifuges exhibit significant shortcomings. The drum of a horizontal screw centrifuge typically rotates at a high speed of several thousand revolutions per minute, and the screw conveyor rotates in the same direction at a similar but slightly different speed. When untreated raw slurry enters the high-speed rotating drum directly, the high-hardness, large-particle impurities such as sand, metal fragments, and gravel, under the powerful centrifugal force, violently impact and continuously grind the surface of the screw blades and the inner wall of the drum at extremely high linear velocities (up to tens of meters per second). This impact and grinding action far exceeds the tolerance limits of the equipment materials. This continuous mechanical wear causes the screw blades to rapidly thin, deform, or even break, and grooves or pits to appear on the inner wall of the drum. For example, in construction piling mud treatment sites, the mud often contains a large amount of quartz sand (extremely hard). A horizontal screw centrifuge without effective pre-screening may require replacement of its spiral blades within just a few weeks due to severe wear, while the normal design life of this component should be several months or even longer. This not only leads to frequent equipment downtime for maintenance, increasing maintenance costs (replacing a set of spiral feeders is expensive), but more seriously, the increased gap between the worn blades disrupts the fluid dynamic balance inside the centrifuge, resulting in poor solid phase discharge, turbid liquid phase, and ultimately causing the entire dewatering system to fail. Summary of the Invention

[0004] The purpose of this invention is to provide a horizontal screw centrifugal dewatering machine for mud screening and dewatering, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a horizontal screw centrifugal dewatering machine for mud screening and dewatering, comprising: A rotating drum assembly, which is arranged to rotate about its own axis; The spiral feeder is coaxially mounted inside the drum assembly and rotates at a differential speed relative to the drum assembly. Drive unit, used to drive the drum assembly and screw feeder to rotate; A feeding device is used to convey the slurry to be treated into the interior of the drum assembly; A liquid phase outlet is located at the end of the drum assembly and is used to discharge the separated liquid phase. A solid phase outlet is located at the other end of the drum assembly and is used to discharge the separated solid phase. A vibrating screen is located on one side of the feeding device. The feeding end of the vibrating screen is used to receive the raw slurry. Impurities are screened and retained on the screen. The under-screen outlet is connected to the feeding port of the rotating drum assembly.

[0006] In a preferred embodiment of this scheme, the horizontal screw sedimentation centrifuge further includes: The base frame provides a platform for supporting and mounting various components; The lower cover is embedded in the base frame, and the drum assembly is mounted in the lower cover; The upper housing is hinged to the top end of the lower housing and connected to the lower housing to form an openable and closable chamber in which the drum assembly is located.

[0007] In a preferred embodiment of this scheme, the drum assembly includes a cylindrical section and a conical section, wherein the inner diameters at the connection between the cylindrical and conical sections are the same, and the inner diameter of the conical section gradually decreases along the direction of solid phase discharge.

[0008] In this preferred embodiment, the cone angle of the conical segment is between 10° and 20°.

[0009] In a preferred embodiment of this scheme, the horizontal screw sedimentation centrifuge further includes: The first sensor is installed in the pipe of the feeding device to detect the density of the slurry entering the drum assembly; The second sensor is located outside the solid phase outlet and is used to detect the moisture content of the discharged solid phase. The controller system has its signal input terminals connected to the first sensor and the second sensor respectively, and its signal output terminal connected to the drive device. It is used to adjust the rotation speed of the drum assembly and the differential speed of the screw feeder relative to the drum assembly according to the received density signal and moisture content signal.

[0010] In a preferred embodiment of this scheme, the driving device includes a main motor for driving the spiral feeder to rotate and a differential for driving the drum assembly to rotate, and the signal output terminal of the controller system is connected to the driver of the main motor and the differential.

[0011] In this preferred embodiment, the pitch of the spiral blades of the spiral feeder in the cylindrical section is greater than the pitch in the conical section.

[0012] In a preferred embodiment, the vibrating screening device includes a screen box, a screen mesh disposed in the screen box, a feeding bin integrally connected to the bottom of the screen box, and a feeding port disposed at the bottom of the feeding bin. The feeding port is connected to the feeding pipe in the feeding device through a feeding hose.

[0013] In a preferred embodiment, a connecting shaft is rotatably mounted on one side of the main motor. The end of the connecting shaft near the main motor is connected to the main motor via a belt drive. At least two eccentric blocks are symmetrically fixed at the other end of the connecting shaft. The eccentric ends of the two eccentric blocks abut against the outer wall of the screen box. A cylinder is provided on the side of the screen box facing away from the eccentric blocks for reciprocatingly and intermittently pushing the screen box toward the eccentric blocks.

[0014] In a preferred embodiment, the spiral blades of the spiral feeder are provided with detachable wear-resistant plates, which are fixed to the spiral blades by screws. The inner walls of both the lower and upper covers are provided with corrosion-resistant components.

[0015] Compared with the prior art, the technical effects and advantages of the present invention are as follows: This horizontal screw sedimentation centrifugal dewatering machine for slurry screening and dewatering integrates the vibrating screening device on one side of the feeding device, and directly connects its undersize outlet to the feed inlet of the drum assembly. This design allows the raw slurry to undergo physical screening before entering the high-speed rotating centrifuge body, effectively pre-removing large particulate impurities (such as sand, fibers, and plastic fragments). This prevents these hard impurities from directly entering the drum and causing severe wear on the spiral blades or the inner wall of the drum, or even leading to equipment blockage or mechanical damage. It significantly improves the operational stability of the entire dewatering system and the service life of core components, while reducing the load on subsequent centrifugal separation and ensuring the continuity and efficiency of the centrifugal separation process.

[0016] By employing a design that uses a differential rotation between the drum assembly and the coaxially mounted screw pusher inside, the high-speed rotation of the drum generates a strong centrifugal force field to achieve solid-liquid stratification. At the same time, the screw pusher can continuously and steadily push the solid sediments settled on the inner wall of the drum axially with a small differential speed. This achieves the functions of continuous discharge of the solid phase and continuous clarification and separation of the liquid phase, enabling the uninterrupted processing of large amounts of slurry in a closed state. This ensures the core advantages of the horizontal screw sedimentation centrifugal dewatering machine: high processing capacity and high degree of automation. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the spiral feeder of the present invention; Figure 3 This is a schematic diagram of the structure of the vibrating screening device of the present invention; Figure 4 This is a schematic diagram of the structure of the feeding bin and feeding port of the present invention; Figure 5 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 6 This is a schematic diagram of the installation structure of the wear-resistant liner of the present invention; Figure 7 This is a schematic diagram showing the connection between the supporting base plate and the silicone noise reduction pad of the present invention; Figure 8 This is a schematic diagram of the steel ball mounting structure of the present invention.

[0019] Explanation of reference numerals in the attached figures: In the diagram: 1. Drum assembly; 2. Screw feeder; 3. Drive unit; 4. Feeding device; 5. Liquid phase outlet; 6. Solid phase outlet; 7. Vibrating screen; 8. Base frame; 9. Lower cover; 10. Upper cover; 11. Main motor; 12. Differential; 13. Cylindrical section; 14. Conical section; 15. Motor support; 16. Bearing housing assembly; 17. Support base; 18. Sensor; 19. Connecting shaft; 20. Shaft mounting base; 21. Linkage pulley; 22. Drive pulley; 23. Support base plate; 24. Fixed upright plate; 25. Positioning guide rod; 26. Eccentric block; 27. Movable support plate; 28. Screen box; 29. ​​Screen mesh; 30. Fixed plate; 31. Cylinder; 32. Piston rod; 33. Feed hose; 34. Feed pipe; 35. Feed hopper; 36. Feed port; 37. Spiral blade; 38. Removable wear-resistant plate; 39. Corrosion-resistant plate; 40. Support base plate; 41. Silicone noise reduction pad; 42. Steel ball. Detailed Implementation

[0020] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0021] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this invention, and are explained here together.

[0022] This embodiment provides, for example Figures 1 to 8 The shown is a horizontal screw sedimentation centrifugal dewatering machine for mud screening and dewatering, including a drum assembly 1, a screw pusher 2, a drive device 3, a feeding device 4, a liquid phase outlet 5, a solid phase outlet 6, and a vibrating screening device 7.

[0023] In this embodiment, the drum assembly 1 is rotatably arranged around its own axis; the screw conveyor 2 is coaxially arranged inside the drum assembly 1 and rotates at a differential speed relative to the drum assembly 1; the drive device 3 is used to drive the drum assembly 1 and the screw conveyor 2 to rotate; the feeding device 4 is used to transport the slurry to be treated into the drum assembly 1; the liquid phase outlet 5 is arranged at the end of the drum assembly 1 and is used to discharge the separated liquid phase; the solid phase outlet 6 is arranged at the other end of the drum assembly 1 and is used to discharge the separated solid phase; the vibrating screen device 7 is arranged on one side of the feeding device 4, the feeding end of the vibrating screen device 7 is used to receive the original slurry, the impurities are screened on its screen, and its under-screen outlet is connected to the feed port of the drum assembly 1.

[0024] In this embodiment, the horizontal screw sedimentation centrifuge also includes: The base frame 8 provides a platform for supporting and mounting various components; The lower cover 9 is embedded in the base frame 8, and the drum assembly 1 is mounted in the lower cover 9; The upper cover 10 is hinged to the top end of the lower cover 9 and connected to the lower cover 9 to form an openable and closable chamber, in which the drum assembly 1 is located.

[0025] In this embodiment, the drum assembly 1 includes a cylindrical section 13 and a conical section 14. The inner diameters of the cylindrical section 13 and the conical section 14 are the same at the connection point, and the inner diameter of the conical section 14 gradually decreases along the direction of solid phase discharge.

[0026] In this embodiment, the cone angle of the conical segment 14 is between 10° and 20°.

[0027] In this embodiment, the horizontal screw sedimentation centrifuge also includes: The first sensor is installed in the pipe of the feeding device 4 to detect the density of the slurry entering the drum assembly 1; The second sensor 18 is located outside the solid phase discharge port 6 and is used to detect the moisture content of the discharged solid phase. The controller system has its signal input terminals connected to the first sensor and the second sensor 18, respectively, and its signal output terminal connected to the drive device 3. It is used to adjust the rotation speed of the drum assembly 1 and the differential speed of the screw feeder 2 relative to the drum assembly 1 according to the received density signal and moisture content signal.

[0028] In this embodiment, the drive device 3 includes a main motor 11 for driving the spiral feeder 2 to rotate and a differential 12 for driving the drum assembly 1 to rotate. The signal output terminal of the controller system is connected to the driver of the main motor 11 and the differential 12.

[0029] In this embodiment, the pitch of the spiral blades 37 of the spiral feeder 2 in the cylindrical section 13 is greater than the pitch in the conical section 14.

[0030] In this embodiment, the vibrating screening device 7 includes a screen box 28, a screen mesh 29 disposed in the screen box 28, a feeding bin 35 integrally connected to the bottom of the screen box 28, and a feeding port 36 disposed at the bottom of the feeding bin 35. The feeding port 36 is connected to the feeding pipe 34 in the feeding device 4 through a feeding hose 33. The feeding device 4 also includes a bearing housing assembly 16 and a support base 17 for supporting the feeding pipe 34. The end of the feeding pipe 34 away from the feeding hose 33 extends into the screw pusher 2. The bearing housing assembly 16 and the support base 17 are fixed to the inner wall of the base frame 8.

[0031] In this embodiment, a connecting shaft 19 is rotatably provided on one side of the main motor 11. One end of the connecting shaft 19 near the main motor 11 is connected to the main motor 11 via a belt drive. At least two eccentric blocks 26 are symmetrically fixed on the other end of the connecting shaft 19. The eccentric ends of the two eccentric blocks 26 abut against the outer wall of the screen box 28. A cylinder 31 is provided on the side of the screen box 28 facing away from the eccentric blocks 26 for reciprocatingly and intermittently pushing the screen box 28 toward the eccentric blocks 26. A motor support 15 is bolted to one end of the base frame 8. The main motor 11 is fixedly mounted on the top surface of the motor support 15. At least two shaft mounting seats 20 are symmetrically welded to one side of the outer wall of the motor support 15. The connecting shaft 19 is mounted in the two shaft mounting seats 20 through bearings. The belt drive includes a drive pulley 22 mounted on the output shaft of the main motor 11, a linkage pulley 21 mounted on one end of the connecting shaft 19, and a belt connecting the drive pulley 22 and the linkage pulley 21. A support base 23 is horizontally fixed to one side of the base frame 8. Fixed upright plates 24 are welded to both ends of the top surface of the support base 23. Movable support plates 27 are welded to both ends of the bottom surface of the screen box 28. The two movable support plates 27 support the screen box 28 on the support base 23 and are located between the two fixed upright plates 24. Two positioning guide rods 25 are symmetrically welded between the two fixed upright plates 24. The two positioning guide rods 25 pass through the two movable support plates 27, so that the two movable support plates 27 can be positioned such that the screen box 28 can be positioned between the two fixed upright plates 24. The support plate 27 slides linearly back and forth on the two positioning guide rods 25, thereby driving the screen box 28 to move linearly back and forth. This allows the screen 29 to screen the original slurry to be treated. Impurities with a particle size larger than the aperture size of the screen 29 remain on the screen 29, while slurry with a particle size smaller than the aperture size of the screen 29 is fed into the feed pipe 34 through the feed hose 33. The impurities on the screen 29 are collected and processed, located between the two positioning guide rods 25 and on top of the support base 23. A fixed plate 30 is welded to the surface, and there is a safe distance between the fixed plate 30 and the movable support plate 27 so as not to hinder the linear movement of the movable support plate 27 for screening. The cylinder 31 is installed on the top outer wall of the fixed plate 30, and the piston rod 32 of the cylinder 31 passes through the fixed plate 30 and dynamically abuts against the outer wall of the screen box 28. Multiple steel balls 42 are embedded in the bottom surface of the movable support plate 27 at equal intervals. The steel balls 42 roll and rub against the top surface of the support base 23, which helps the linear movement of the movable support plate 27. When the main motor 11 is running, it can not only drive the screw feeder 2 to rotate, but also drive the connecting shaft 19 to rotate in the shaft mounting seat 20 through the belt drive component. This causes the connecting shaft 19 to drive the two eccentric blocks 26 to abut against the screen box 28, forming a force that pushes the screen box 28, causing the screen box 28 to move toward the fixed plate 30. At the same time, the cylinder 31 drives the piston rod 32 to push the screen box 28 back toward the eccentric blocks 26, so that the screen box 28 moves back and forth between the eccentric blocks 26 and the piston rod 32, thereby forming a screening action for the mud.

[0032] In this embodiment, by utilizing the same power source of the main drive motor 11, the connecting shaft 19 is driven to rotate via belt transmission components (drive pulley 22, linkage pulley 21, belt), thereby driving the eccentric blocks 26 at both ends to periodically impact the screen box 28. This design enables the power source of the vibrating screening device 7 to be linked and shared with the core drive motor of the centrifuge body. This not only provides the function of providing excitation force for the vibrating screen, but also achieves the unexpected effect of eliminating the need for an additional independent vibration motor. This simplifies the equipment structure, reduces manufacturing costs and energy consumption, and ensures the synchronization of screening vibration with the operation of the centrifuge body, avoiding interference caused by multi-source vibration. By mounting the cylinder 31 on the fixed plate 30, with its piston rod 32 dynamically abutting against the outer wall of the screen box 28 and in the opposite direction to the thrust of the eccentric block 26, the thrust of the cylinder and the centrifugal thrust of the eccentric block form a pair of opposing forces. This achieves precise control of the reciprocating intermittent pushing function of the screen box 28, resulting in an unexpected effect of dual drive and coordinated vibration. The eccentric block provides high-frequency basic vibration, while the cylinder provides controllable and clearly directional reverse thrust. The combination of the two not only enhances the vibration intensity and efficiency of screening, but also optimizes the screening process (such as preventing screen blockage) by adjusting the timing of the cylinder action, thus improving the adaptability and reliability of the vibrating screen.

[0033] In this embodiment, the surface of the spiral blade 37 of the spiral feeder 2 is provided with a removable wear-resistant plate 38. The removable wear-resistant plate 38 is fixed to the spiral blade 37 by screws. The inner walls of the lower cover 9 and the upper cover 10 are both provided with corrosion-resistant components. The corrosion-resistant components include silicone noise-reducing pads 41 respectively bonded to the inner walls of the lower cover 9 and the upper cover 10, a support base plate 40 bonded to the outer wall of the silicone noise-reducing pad 41, and a corrosion-resistant plate 39 installed on the outer wall of the support base plate 40 by screws. The corrosion-resistant plate 39 plays a role in corrosion resistance, while the silicone noise-reducing pad 41 plays a role in shock absorption and noise reduction. By providing a removable wear-resistant plate 38 on the surface of the spiral blade 37 of the spiral feeder 2, the critical working surface of this easily worn component, the spiral blade, is effectively protected. This achieves the function of replaceable maintenance of key vulnerable parts, and the effect of restoring equipment performance by replacing only the wear-resistant plate without replacing the entire spiral feeder, greatly reducing maintenance costs and downtime.

[0034] In this embodiment, by embedding multiple steel balls 42 at equal intervals on the bottom surface of the movable support plate 27 and making them roll and rub against the top surface of the support base 23, the reciprocating linear motion of the screen box 28 is transformed from traditional sliding friction to rolling friction. This not only achieves the support and guiding functions, but also achieves the unexpected effects of significantly reducing motion resistance, reducing wear, and improving vibration transmission efficiency. At the same time, the rolling contact characteristic makes the entire vibrating screening system run more smoothly and with lower noise, indirectly extending the service life of the positioning guide rod 25 and the movable support plate 27.

[0035] Working principle The horizontal screw sedimentation centrifugal dewatering machine for mud screening and dewatering first transports the raw mud to be treated to the feed end of the vibrating screening device 7 (i.e., the top of the screen box 28). When the main motor 11 starts running, its output shaft not only drives the screw pusher 2 inside the centrifuge, but also drives the connecting shaft 19 to rotate through the belt drive component (composed of the drive pulley 22, the linkage pulley 21 and the belt). The eccentric blocks 26 connecting the two ends of the shaft 19 rotate accordingly. The eccentric end periodically abuts against and pushes the screen box 28, generating a thrust in the direction of the fixed plate 30. At the same time, the cylinder 31 works according to the set program, and its piston rod 32 extends to push the screen box 28 to overcome the thrust of the eccentric block 26 and move in the opposite direction (i.e. towards the eccentric block 26). The continuous rotational thrust of the eccentric block 26 combined with the intermittent reverse thrust of the cylinder 31 causes the screen box 28 to drive the screen component 29 to reciprocate linearly under the guidance of the positioning guide rod 25. The steel ball 42 at the bottom of the moving support plate 27 rolls on the support base plate 23, which significantly reduces frictional resistance and ensures stable and efficient vibration.

[0036] Under the vibration of the screen 29, the original mud is evenly spread on the screen surface and moves forward. Mud particles and liquid with a particle size smaller than the screen aperture (i.e., undersize material) pass through the screen 29 and fall into the feed hopper 35 below. They flow into the feed pipe 34 through the feed port 36 and the feed hose 33. Large particles of impurities with a particle size larger than the screen aperture, such as sand, gravel, and fibers, are trapped on the surface of the screen 29 (i.e., oversize material) and collected and processed in a concentrated manner, thereby achieving preliminary solid-liquid separation and impurity removal. The pre-screened, relatively clean sludge is continuously and stably injected into the high-speed rotating drum assembly 1 from the center of one end of the centrifuge through the feed pipe 34. Driven by the drive device 3 (specifically by the differential 12), the drum assembly 1 rotates at high speed around its own axis, forming a strong centrifugal force field (up to thousands of times the acceleration of gravity) inside the drum. Under the action of centrifugal force, the denser solid particles (sludge, fine solids) quickly settle and adhere to the inner wall of the drum, forming a solid sedimentation layer, while the less dense liquid phase (water or clarified liquid) gathers on the inner side of the solid layer, forming a liquid layer.

[0037] The screw feeder 2 is driven by the main motor 11 through the differential 12, and rotates coaxially with the drum assembly 1 with a slight speed difference. The solid phase layer that settles on the inner wall of the drum is continuously and smoothly pushed along the inner wall of the drum towards the conical section 14 of the drum by the rotating screw blades 37. Since the drum assembly 1 is composed of a cylindrical section 13 and a conical section 14, and the inner diameter of the conical section 14 gradually decreases along the pushing direction (the cone angle is 10°-20°), the solid phase layer is subjected to gradually enhanced compression during the pushing process, further removing the water entrained in it, achieving efficient dehydration. Finally, the dehydrated solid phase is discharged from the solid phase outlet 6 (at the end of the conical section) of the drum assembly 1. The liquid phase that accumulates in the central area inside the drum is continuously discharged from the liquid phase outlet 5 through the weir plate or overflow hole of the drum assembly 1 (at the end of the cylindrical section) under the action of centrifugal force, realizing the recovery of clarified liquid.

[0038] A first sensor installed in the feed pipe 34 detects the density of the slurry entering the drum in real time, reflecting the feed concentration. A second sensor 18 installed outside the solid phase discharge port 6 detects the moisture content of the discharged solid phase in real time, reflecting the dewatering effect. These detection signals are transmitted to the controller system, which dynamically adjusts the drivers of the main motor 11 and the differential 12 through its signal output terminal, thereby precisely controlling the rotational speed of the drum assembly 1 and the differential speed of the screw conveyor 2 relative to the drum. The removable wear-resistant plate 38 on the screw conveyor 2 protects the screw blades 37 from wear and can be replaced periodically. The corrosion-resistant plates 39 on the inner walls of the lower cover 9 and the upper cover 10 effectively resist the corrosion of the slurry and extend the service life of the equipment. The silicone noise-reducing pads 41 on the inner walls can effectively absorb vibration and reduce the noise generated during equipment operation. The upper cover 10 and the lower cover 9 are connected by a hinge and can be opened and closed, facilitating the inspection and maintenance of the internal core components such as the drum assembly 1.

[0039] It should be noted that, in this document, relational terms such as "one" and "two" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A horizontal screw centrifugal dewatering machine for mud screening and dewatering, characterized in that, include: A rotating drum assembly (1) is arranged to rotate about its own axis; The spiral feeder (2) is coaxially disposed inside the drum assembly (1) and rotates at a differential speed relative to the drum assembly (1); Drive unit (3) is used to drive the drum assembly (1) and the screw feeder (2) to rotate; Feeding device (4) is used to convey the slurry to be treated into the drum assembly (1); A liquid phase outlet (5) is provided at the end of the drum assembly (1) for discharging the separated liquid phase; A solid phase outlet (6) is provided at the other end of the drum assembly (1) for discharging the separated solid phase; Vibrating screen device (7) is located on one side of the feeding device (4). The feeding end of the vibrating screen device (7) is used to receive the original mud slurry. Impurities are screened on the screen and the under-screen outlet is connected to the feed port of the drum kit (1).

2. The horizontal screw centrifugal dewatering machine for mud screening and dewatering according to claim 1, characterized in that: The horizontal screw sedimentation centrifuge also includes: The base frame (8) provides a platform for supporting and mounting various components; The lower cover (9) is embedded in the base frame (8), and the drum assembly (1) is mounted in the lower cover (9); The upper cover (10) is hinged to the top end of the lower cover (9) and connected to the lower cover (9) to form an openable and closable chamber in which the drum assembly (1) is located.

3. The horizontal screw centrifugal dewatering machine for mud screening and dewatering according to claim 2, characterized in that: The drum assembly (1) includes a cylindrical section (13) and a conical section (14). The inner diameters of the cylindrical section (13) and the conical section (14) are the same at the connection point. The inner diameter of the conical section (14) gradually decreases along the direction of solid phase discharge.

4. A horizontal screw centrifugal dewatering machine for mud screening and dewatering according to claim 3, characterized in that: The cone angle of the conical segment (14) is between 10° and 20°.

5. A horizontal screw centrifugal dewatering machine for mud screening and dewatering according to claim 4, characterized in that: The horizontal screw sedimentation centrifuge also includes: The first sensor is installed in the pipe of the feeding device (4) to detect the density of the slurry entering the drum assembly (1); The second sensor (18) is located outside the solid phase outlet (6) and is used to detect the moisture content of the discharged solid phase. The controller system has its signal input terminals connected to the first sensor and the second sensor (18) respectively, and its signal output terminal connected to the drive device (3), for adjusting the rotation speed of the drum assembly (1) and the differential speed of the screw feeder (2) relative to the drum assembly (1) according to the received density signal and moisture content signal.

6. A horizontal screw centrifugal dewatering machine for mud screening and dewatering according to claim 5, characterized in that: The drive unit (3) includes a main motor (11) for driving the spiral feeder (2) to rotate and a differential (12) for driving the drum assembly (1) to rotate. The signal output terminal of the controller system is connected to the driver of the main motor (11) and the differential (12).

7. A horizontal screw centrifugal dewatering machine for mud screening and dewatering according to claim 4, characterized in that: The pitch of the spiral blades (37) of the spiral feeder (2) in the cylindrical section (13) is greater than the pitch in the conical section (14).

8. A horizontal screw centrifugal dewatering machine for mud screening and dewatering according to claim 6, characterized in that: The vibrating screening device (7) includes a screen box (28), a screen mesh (29) disposed in the screen box (28), a feeding bin (35) integrally connected to the bottom of the screen box (28), and a feeding port (36) disposed at the bottom of the feeding bin (35). The feeding port (36) is connected to the feeding pipe (34) in the feeding device (4) through a feeding hose (33).

9. A horizontal screw centrifugal dewatering machine for mud screening and dewatering according to claim 8, characterized in that: A connecting shaft (19) is rotatably provided on one side of the main motor (11). The end of the connecting shaft (19) near the main motor (11) is connected to the main motor (11) via a belt drive. At least two eccentric blocks (26) are symmetrically fixed on the other end of the connecting shaft (19). The eccentric ends of the two eccentric blocks (26) abut against the outer wall of the screen box (28). A cylinder (31) is provided on the side of the screen box (28) facing away from the eccentric blocks (26) for reciprocating intermittently pushing the screen box (28) toward the eccentric blocks (26).

10. A horizontal screw centrifugal dewatering machine for mud screening and dewatering according to claim 2, characterized in that: The spiral blade (37) of the spiral feeder (2) is provided with a removable wear-resistant plate (38), which is fixed to the spiral blade (37) by screws. The inner walls of the lower cover (9) and the upper cover (10) are provided with corrosion-resistant components.

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