A mud slurry wastewater purification treatment device for construction engineering construction

Abstract

This invention discloses a device for purifying and treating mud wastewater used in construction engineering, relating to the field of construction wastewater treatment technology. The device includes a frame; a settling tank, fixedly mounted on the frame, for containing and settling mud wastewater, with a downwardly contracting sludge collection hopper at its bottom and a sludge discharge port at the lowest point of the hopper; a cover plate, detachably mounted on the top of the settling tank, with an external power supply drive unit mounted on the top of the cover plate; and a rotating shaft, vertically positioned at the center of the settling tank and the sludge collection hopper, its upper end connected to the output shaft of the drive unit via a coupling, and its lower end extending into the sludge collection hopper. This invention uses a forward and reverse rotation control linkage mechanism of the drive unit, ensuring that during settling, only the bottom wall is scraped to avoid disturbance, and during sludge discharge, the double scrapers work in tandem to break up the mud, thereby keeping the inner wall clean, reducing clogging, and making the mud treatment process smoother.

Description

Technical Field

[0001] This invention relates to the field of construction wastewater treatment technology, specifically to a device for purifying and treating mud wastewater used in construction projects. Background Technology

[0002] In construction engineering, especially in pile foundation engineering, diaphragm wall construction, and tunnel boring, a large amount of mud wastewater is generated. This mud wastewater is characterized by high sand content and high viscosity. Construction sites are usually equipped with mud purification and treatment devices, the main structure of which includes a settling tank. The mud wastewater is transported into the settling tank, where, through gravity settling, the denser mud and sand particles settle to the bottom of the tank, while the less dense supernatant is discharged from the outlet pipe at the top of the tank, thus achieving preliminary solid-liquid separation of the mud.

[0003] However, existing mud wastewater purification devices have a significant drawback in practical applications that greatly troubles on-site operators: after the mud settles in the settling tank, a dense, poorly fluid, concentrated mud layer forms at the bottom, which easily hardens and clogs the discharge port. Simultaneously, mud and sand particles gradually adhere to the inner walls of the settling tank and the conical inner wall of the sludge collection hopper, forming a hard scale layer. To clean this scale and unclog the discharge port, operators must frequently stop the machine for manual cleaning, using steel bars to poke or high-pressure water guns to flush. This unclogging operation is not only labor-intensive and inefficient, but also causes mud to splash out upon opening, polluting the equipment and the surrounding environment, severely impacting the continuity of construction and maintaining civilized construction practices. Summary of the Invention

[0004] The purpose of this invention is to provide a mud wastewater purification and treatment device for construction engineering, which aims to solve the problems of easy scaling on the inner wall of the settling tank and easy blockage of the mud discharge port in the existing device, realize the automation of the cleaning process, and at the same time avoid disturbing the mud settling during the cleaning process.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a mud wastewater purification and treatment device for construction engineering, comprising a frame;

[0006] A settling tank, fixedly mounted on the frame, is used to contain mud wastewater and perform settling and separation. It has a downward-contracting mud collection hopper at the bottom, and a mud discharge port at the lowest end of the mud collection hopper.

[0007] A cover plate is detachably installed on the top of the settling tank, and a drive unit with an external power supply is installed on the top of the cover plate;

[0008] A rotating shaft is vertically positioned at the center of the settling tank and the sludge hopper. Its upper end is connected to the output shaft of the drive unit via a coupling, and its lower end extends into the sludge hopper.

[0009] The second scraper is installed in a ring-shaped inclined manner at the lower end of the rotating shaft and is located inside the sludge hopper. The scraper blade of the second scraper is in sliding contact with the conical inner wall of the sludge hopper.

[0010] At least one sleeve is fitted onto the rotating shaft and is distributed vertically at intervals. The top and bottom of the sleeve are respectively provided with a first bearing. The inner ring of the first bearing is fixedly connected to the rotating shaft, and the outer ring is fixedly connected to the sleeve.

[0011] The first scraper, having multiple scrapers arranged in a ring, is fixedly installed on the outer wall of the sleeve. The scraping blade of the first scraper slides in contact with the inner wall of the settling tank.

[0012] A linkage transmission mechanism is provided between the rotating shaft and the sleeve, which is used to keep the sleeve stationary when the driving component rotates forward and to make the sleeve rotate synchronously with the rotating shaft when the driving component rotates in reverse.

[0013] Multiple crushing blades are provided and fixedly installed on the rotating shaft in a multi-layered ring distribution, located below the second scraper and above the sludge discharge port.

[0014] Furthermore, the linkage transmission mechanism includes:

[0015] The driving plate, consisting of at least two layers, is fixedly installed on the outer wall of the rotating shaft in a ring-shaped distribution. Each driving plate is located inside one of the sleeves. The cross-section of the driving plate is hook-shaped, and a first groove that is recessed inward is formed on the side facing the rotation direction of the rotating shaft.

[0016] A linkage plate is disposed inside the sleeve, corresponding to the position of the driving plate. The cross-section of the linkage plate is also hook-shaped, and a second groove that is recessed inward is formed on the side facing the driving plate.

[0017] A movable rod is radially inserted through the sleeve wall. The inner end of the movable rod is fixedly connected to the linkage plate, and the outer end extends to the outside of the sleeve and is fixedly provided with an abutment ring.

[0018] A return spring is sleeved on the movable rod and located inside the sleeve. One end of the return spring abuts against the linkage plate, and the other end abuts against the inner wall of the sleeve.

[0019] Furthermore, in its natural state, the reset spring pushes the linkage plate to move closer to the rotation axis, causing the abutment ring to abut against the outer wall of the sleeve, while keeping the linkage plate in contact or close to contact with the driving plate.

[0020] Furthermore, the driving plate has a first inclined surface, and the linkage plate has a second inclined surface; when the driving member rotates forward, the first inclined surface of the driving plate slides into contact with the second inclined surface of the linkage plate, pushing the linkage plate to overcome the elastic force of the return spring and move away from the rotation axis, so that the driving plate and the linkage plate disengage; when the driving member rotates in reverse, the first groove of the driving plate and the second groove of the linkage plate engage with each other, driving the linkage plate to rotate synchronously with the driving plate.

[0021] Furthermore, a positioning ring is fixedly connected to the rotating shaft, and the outer wall of the positioning ring is provided with annularly distributed docking parts. The end of the docking parts is provided with a threaded part, which is detachably connected to the positioning ring through the threaded part. The other end of the docking parts is detachably connected to the second scraper through a locking part. The scraper blade of the second scraper is made of steel and is serrated.

[0022] Furthermore, the hardness of the first scraper blade is less than the hardness of the second scraper blade.

[0023] Furthermore, the crushing blade is made of steel and is inclined downwards or to the side.

[0024] Furthermore, the sludge hopper is provided with a support plate inside, the support plate has a cross-shaped cross section, a second bearing is provided inside the support plate, the rotating shaft is movably mounted on the second bearing, the bottom of the sludge discharge port is provided with a threaded sealing switch door, the top of the cover plate is symmetrically welded with a support frame, and the driving component is mounted on the top of the support frame.

[0025] Furthermore, the side wall of the settling tank is provided with a feed pipe for conveying mud wastewater into the settling tank, and the side wall of the settling tank is provided with a discharge pipe, which is connected to a clear liquid collection tank through a conveying pipeline.

[0026] Compared with the prior art, the present invention provides a slurry wastewater purification and treatment device for construction engineering. By setting a relatively rotatable sleeve on a rotating shaft, and installing a first scraper for scraping the inner wall of the settling tank on the sleeve, and a second scraper for scraping the inner wall of the sludge collection hopper at the lower end of the rotating shaft, and cooperating with a linkage transmission mechanism set between the rotating shaft and the sleeve, when the driving component rotates forward, the linkage transmission mechanism is in a disengaged state, and only the second scraper rotates with the rotating shaft to clean the inner wall of the sludge collection hopper, while the first scraper remains stationary, thus avoiding disturbance to the slurry settling process caused by the rotation of the first scraper.

[0027] When the drive component reverses, the linkage transmission mechanism engages, causing the sleeve and the first scraper to rotate synchronously with the rotating shaft. This allows the first and second scrapers to thoroughly clean the inner walls of the settling tank and the sludge hopper. Simultaneously, the crushing blades at the lower end of the rotating shaft break up the concentrated sludge above the discharge port during rotation. This structural design ensures the device maintains clean inner walls during continuous operation, reduces the likelihood of sludge port blockage, and minimizes interference with sludge settling during cleaning, resulting in smoother sludge treatment. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0029] Figure 1 This is a three-dimensional view of the overall structure of the construction mud wastewater purification and treatment device provided in an embodiment of the present invention.

[0030] Figure 2 This is a cross-sectional view of the internal structure of the settling tank and sludge hopper provided in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the overall internal structure of the sleeve provided in an embodiment of the present invention;

[0032] Figure 4 This is a cross-sectional view of the internal linkage plate and other components of the sleeve provided in an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the rotating shaft driving the reverse state according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the rotating shaft driving forward rotation provided in an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the structure of components such as the second scraper inside the mud collection chamber provided in an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Frame; 2. Settling tank; 3. Sludge hopper; 4. Sludge discharge port; 5. Cover plate; 6. Drive component; 7. Rotating shaft; 8. Coupling; 9. Second scraper; 10. Sleeve; 11. First bearing; 12. First scraper; 13. Crusher blade; 14. Drive plate; 1401. First groove; 1402. First inclined surface; 15. Linkage plate; 1501. Second groove; 1502. Second inclined surface; 16. Movable rod; 17. Abutment ring; 18. Return spring; 19. Positioning ring; 20. Connecting component; 21. Locking component; 22. Support plate; 23. Second bearing; 24. Sealing switch door; 25. Bearing frame; 26. Feed pipe; 27. Discharge pipe; 28. Clear liquid collection tank. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] As attached Figure 1 To be continued Figure 7 As shown:

[0040] Example:

[0041] This invention provides a device for purifying and treating mud wastewater used in construction engineering, including a frame 1;

[0042] Settling tank 2 is fixedly installed on the frame 1 and is used to contain mud wastewater and perform settling and separation. It has a downward-contracting mud collection hopper 3 at its bottom and a mud discharge port 4 at the lowest end of the mud collection hopper 3.

[0043] The cover plate 5 is detachably installed on the top of the settling tank 2, and the top of the cover plate 5 is equipped with a drive unit 6 connected to an external power supply.

[0044] The rotating shaft 7 is vertically positioned at the center of the settling tank 2 and the sludge hopper 3. Its upper end is connected to the output shaft of the drive component 6 via a coupling 8, and its lower end extends into the sludge hopper 3.

[0045] The second scraper 9 is installed in a ring-shaped inclined manner at the lower end of the rotating shaft 7 and is located inside the mud collection hopper 3. The scraper blade of the second scraper 9 slides in contact with the conical inner wall of the mud collection hopper 3.

[0046] At least one sleeve 10 is sleeved on the rotating shaft 7 and distributed vertically at intervals. The top and bottom of the sleeve 10 are respectively provided with a first bearing 11. The inner ring of the first bearing 11 is fixedly connected to the rotating shaft 7, and the outer ring is fixedly connected to the sleeve 10.

[0047] Multiple first scraper blades 12 are provided and are fixedly installed on the outer wall of the sleeve 10 in a ring-shaped distribution. The scraping blades of the first scraper blades 12 slide in contact with the inner wall of the settling tank 2.

[0048] A linkage transmission mechanism is provided between the rotating shaft 7 and the sleeve 10, which is used to keep the sleeve 10 stationary when the driving member 6 rotates forward and to make the sleeve 10 rotate synchronously with the rotating shaft 7 when the driving member 6 rotates in reverse.

[0049] Multiple crushing blades 13 are provided and are fixedly installed on the rotating shaft 7 in a multi-layered ring distribution, and are located below the second scraper 9 and above the mud discharge port 4.

[0050] It should be noted that by setting a relatively rotatable sleeve 10 on the rotating shaft 7, and installing a first scraper 12 for scraping the inner wall of the settling tank 2 on the sleeve 10, and simultaneously installing a second scraper 9 for scraping the inner wall of the sludge collection hopper 3 at the lower end of the rotating shaft 7, and cooperating with the linkage transmission mechanism set between the rotating shaft 7 and the sleeve 10, when the driving component 6 rotates forward, the linkage transmission mechanism is in a disengaged state, and only the second scraper 9 rotates with the rotating shaft 7 to clean the inner wall of the sludge collection hopper 3, while the first scraper 12 remains stationary, thus avoiding disturbance to the sludge settling process caused by the rotation of the first scraper 12.

[0051] When the drive component 6 reverses, the linkage transmission mechanism is engaged, causing the sleeve 10 and the first scraper 12 to rotate synchronously with the rotating shaft 7. This allows the first scraper 12 and the second scraper 9 to thoroughly clean the inner walls of the settling tank 2 and the sludge collection hopper 3. Simultaneously, the crushing blade 13 at the lower end of the rotating shaft 7 crushes the concentrated sludge above the discharge port 4 during rotation. This structural design ensures the device maintains a clean inner wall during continuous operation, reduces the possibility of clogging the discharge port 4, and minimizes interference with sludge settling during the cleaning process, resulting in a smoother sludge treatment process.

[0052] To further clarify: the first bearing 11 can be a rolling bearing or a sliding bearing. If a rolling bearing is used, its inner ring is fixed to the rotating shaft 7 by an interference fit or a key connection, and its outer ring is fixed to the sleeve 10 by an interference fit or an end cap clamping; if a sliding bearing is used, the bearing sleeve and the rotating shaft 7 are in clearance fit, allowing relative rotation, and the bearing housing and the sleeve 10 are fixed by bolts or welding.

[0053] In this embodiment, the linkage transmission mechanism includes:

[0054] The driving plate 14, in no less than two layers, is fixedly installed on the outer wall of the rotating shaft 7 in a ring distribution. Each layer of driving plate 14 is located inside a sleeve 10. The cross-section of the driving plate 14 is hook-shaped, and a first groove 1401 is formed inwardly recessed on the side facing the rotation direction of the rotating shaft 7.

[0055] Linkage plate 15 is disposed inside the sleeve 10 and corresponds to the position of the driving plate 14. The cross-section of the linkage plate 15 is also hook-shaped, and an inwardly recessed second groove 1501 is formed on the side facing the driving plate 14.

[0056] The movable rod 16 is radially inserted through the cylinder wall of the sleeve 10. The inner end of the movable rod 16 is fixedly connected to the linkage plate 15, and the outer end extends to the outside of the sleeve 10 and is fixedly provided with an abutment ring 17.

[0057] A return spring 18 is sleeved on the movable rod 16 and located inside the sleeve 10. One end of the return spring 18 abuts against the linkage plate 15, and the other end abuts against the inner wall of the sleeve 10.

[0058] It should be noted that: the drive plate 14 is fixedly mounted on the rotating shaft 7 and rotates synchronously with the rotating shaft 7. The linkage plate 15 is mounted on the sleeve 10 via the movable rod 16 and can move radially along the sleeve 10. The return spring 18 always applies a thrust toward the rotating shaft 7 to the linkage plate 15, so that the linkage plate 15 remains in contact or close to contact with the drive plate 14 in its natural state. The abutment ring 17 is provided at the outer end of the movable rod 16 to limit the maximum outward movement of the movable rod 16 and prevent the linkage plate 15 from moving excessively inward under the action of the return spring 18 and disengaging from its working position. This structure transforms the cooperation relationship between the drive plate 14 and the linkage plate 15 into a transmission control between the rotating shaft 7 and the sleeve 10. The rotation direction of the drive plate 14 determines whether to drive the linkage plate 15, thereby controlling whether the sleeve 10 rotates with the rotating shaft 7.

[0059] In this embodiment: the reset spring 18 pushes the linkage plate 15 to move closer to the rotating shaft 7 in its natural state, so that the abutment ring 17 abuts against the outer wall of the sleeve 10, while keeping the linkage plate 15 in contact or close to contact with the driving plate 14.

[0060] It should be noted that the preload of the return spring 18 causes the linkage plate 15 to always tend to move towards the rotation axis 7. The contact between the abutment ring 17 and the outer wall of the sleeve 10 limits the inward movement limit of the linkage plate 15, ensuring that the linkage plate 15 and the driving plate 14 maintain an appropriate initial gap or slight contact, so that the driving plate 14 can accurately interact with the linkage plate 15 when rotating. This setting ensures the consistency of the position of the linkage transmission mechanism at startup, avoiding the driving plate 14's inability to effectively contact the linkage plate 15 due to excessive gap, or unnecessary friction due to insufficient gap.

[0061] In this embodiment: the driving plate 14 has a first inclined surface 1402, and the linkage plate 15 has a second inclined surface 1502; when the driving member 6 rotates forward, the first inclined surface 1402 of the driving plate 14 and the second inclined surface 1502 of the linkage plate 15 slide in contact, pushing the linkage plate 15 to overcome the elastic force of the return spring 18 and move away from the rotation axis 7, so that the driving plate 14 and the linkage plate 15 disengage; when the driving member 6 rotates in reverse, the first groove 1401 of the driving plate 14 and the second groove 1501 of the linkage plate 15 engage with each other, driving the linkage plate 15 to rotate synchronously with the driving plate 14.

[0062] It should be noted that when the driving component 6 rotates forward, the first inclined surface 1402 of the driving plate 14 first contacts the second inclined surface 1502 of the linkage plate 15. Due to the relative angle between the two inclined surfaces, the driving plate 14 generates a radially outward pushing force on the linkage plate 15, causing the linkage plate 15 to overcome the elastic force of the return spring 18 and move outward. The driving plate 14 slides past the linkage plate 15 without engaging, so the sleeve 10 does not rotate with the rotating shaft 7. When the driving component 6 rotates in reverse, the first groove 1401 of the driving plate 14 faces the second groove 1501 of the linkage plate 15. When the driving plate 14 rotates to the position of the linkage plate 15, the two grooves interlock and engage. At this time, the force exerted by the driving plate 14 on the linkage plate 15 is a circumferential pulling force, which will not push the linkage plate 15 outward. Therefore, the linkage plate 15 is hooked by the driving plate 14 and rotates with it, driving the sleeve 10 to rotate synchronously through the movable rod 16. This design utilizes the hook-shaped structure and inclined surface of the drive plate 14 to achieve a natural switching of the transmission state during forward and reverse rotation, without the need for additional control components.

[0063] In this embodiment: a positioning ring 19 is fixedly connected to the rotating shaft 7. The outer wall of the positioning ring 19 is provided with annularly distributed docking parts 20. The end of the docking part 20 is provided with a threaded part, which is detachably connected to the positioning ring 19 through the threaded part. The other end of the docking part 20 is detachably connected to the second scraper 9 through a locking part 21. The scraper blade of the second scraper 9 is made of steel and is serrated.

[0064] It should be noted that: the positioning ring 19 is used to install the second scraper 9, and the mating part 20 is connected to the positioning ring 19 through a threaded part, which facilitates disassembly and replacement. The second scraper 9 is fixed to the mating part 20 by the locking part 21. This detachable structure allows the second scraper 9 to be replaced individually when it wears out, without replacing the entire rotating shaft 7. The scraper blade of the second scraper 9 is made of steel and machined into a serrated shape. The serrated structure can enhance the scraping effect on the hard scale layer on the conical inner wall of the mud collection hopper 3. The steel material ensures the wear resistance and service life of the scraper blade, enabling it to withstand long-term scraping of high-concentration mud.

[0065] In this embodiment, the hardness of the first scraper blade 12 is less than the hardness of the second scraper blade 9.

[0066] It should be noted that the first scraper 12 is mainly used to scrape off floating sludge and soft deposits on the inner wall of the settling tank 2. The scale layer in its working environment has relatively low hardness; therefore, using a material with lower hardness (such as polyurethane rubber) can meet the cleaning requirements while reducing wear on the inner wall of the settling tank 2, thus extending the equipment's service life. The second scraper 9 needs to scrape off the hard scale layer formed by long-term deposition on the conical inner wall of the sludge collection hopper 3; therefore, a steel serrated scraper with higher hardness is used to ensure effective scraping. This differentiated design allows the scrapers in different parts to adapt to their respective working environments, ensuring both cleaning effectiveness and equipment durability.

[0067] In this embodiment: the crushing blade 13 is made of steel and is inclined downward or to the side.

[0068] It should be noted that the crusher blade 13 is installed at the lower end of the rotating shaft 7, located below the second scraper 9 and above the sludge discharge port 4, and rotates with the rotating shaft 7. The blade faces downwards or tilts slightly downwards, allowing the crusher blade 13 to cut and crush the concentrated sludge accumulated at the bottom of the sludge collection hopper 3 during rotation, breaking up large pieces of hardened sludge into smaller pieces for easy discharge from the sludge discharge port 4. The crusher blade 13 is made of steel, possessing sufficient strength and wear resistance to withstand the impact and abrasion of high-concentration sludge over a long period. This design physically solves the problem of clogging the sludge discharge port 4, avoiding the inconvenience of manual shoveling.

[0069] In this embodiment: the sludge hopper 3 is provided with a support plate 22 inside, the support plate 22 has a cross-shaped cross section, a second bearing 23 is provided inside the support plate 22, the rotating shaft 7 is movably mounted on the second bearing 23, the bottom of the sludge discharge port 4 is provided with a threaded sealing switch door 24, the top of the cover plate 5 is symmetrically welded with a support frame 25, and the driving component 6 is mounted on the top of the support frame 25.

[0070] It should be noted that the support plate 22 is located inside the sludge hopper 3. Its cross-shaped cross-section structure ensures sufficient structural strength without excessively obstructing the downward flow of sludge, allowing the sludge to pass smoothly through the four fan-shaped areas of the cross-shaped support plate 22. A second bearing 23 is installed at the center of the support plate 22, and the lower part of the rotating shaft 7 passes through the second bearing 23. The second bearing 23 provides auxiliary support and radial positioning for the rotating shaft 7, preventing it from swaying during rotation and ensuring the smooth operation of the rotating shaft 7. Especially for longer rotating shafts 7, this lower support can reduce vibration and extend the service life of the bearings and scrapers.

[0071] The sealing switch door 24 controls the opening and closing of the sludge discharge port 4. The threaded connection ensures a tight seal, preventing sludge leakage. The support frame 25 is welded to the top of the cover plate 5 and is used to mount the drive component 6, suspending it above the settling tank 2. This facilitates heat dissipation and prevents sludge splashing from contaminating the drive component 6. The symmetrical structure of the support frame 25 ensures the stability of the drive component 6 installation and reduces vibration during operation.

[0072] In this embodiment: the side wall of the settling tank 2 is provided with a feed pipe 26 for conveying mud wastewater into the settling tank 2, and the side wall of the settling tank 2 is provided with a discharge pipe 27, which is connected to a clear liquid collection tank 28 through a conveying pipeline.

[0073] It should be noted that: the feed pipe 26 transports the mud wastewater generated at the construction site to the settling tank 2. After the mud settles in the tank, the supernatant overflows from the discharge pipe 27 and flows into the clear liquid collection tank 28 through the conveying pipeline for temporary storage, which can be used for construction reuse or further treatment. This setup achieves preliminary solid-liquid separation of the mud, and the recycling of the clear liquid reduces water waste, meeting the requirements of green construction.

[0074] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for purifying and treating mud wastewater used in construction engineering, characterized in that, include: Rack (1); The settling tank (2) is fixedly installed on the frame (1) and is used to contain mud wastewater and perform settling separation. The bottom of the settling tank is provided with a downward-shrinking mud collection hopper (3), and the lowest end of the mud collection hopper (3) is provided with a mud discharge port (4). The cover plate (5) is detachably installed on the top of the settling tank (2), and the top of the cover plate (5) is equipped with a drive unit (6) connected to an external power supply. The rotating shaft (7) is vertically positioned at the center of the settling tank (2) and the sludge hopper (3). Its upper end is connected to the output shaft of the drive component (6) via a coupling (8), and its lower end extends into the sludge hopper (3). The second scraper (9) is installed in a ring-shaped inclined manner at the lower end of the rotating shaft (7) and is located inside the mud collection hopper (3). The scraper blade of the second scraper (9) slides in contact with the conical inner wall of the mud collection hopper (3). At least one sleeve (10) is sleeved on the rotating shaft (7) and distributed vertically at intervals. The top and bottom of the sleeve (10) are respectively provided with a first bearing (11). The inner ring of the first bearing (11) is fixedly connected to the rotating shaft (7) and the outer ring is fixedly connected to the sleeve (10). Multiple first scrapers (12) are provided and are fixedly installed on the outer wall of the sleeve (10) in a ring-shaped distribution. The scraping blade of the first scraper (12) slides in contact with the inner wall of the settling tank (2). The linkage transmission mechanism is set between the rotating shaft (7) and the sleeve (10) to keep the sleeve (10) stationary when the driving member (6) rotates forward and to make the sleeve (10) rotate synchronously with the rotating shaft (7) when the driving member (6) rotates in reverse. Multiple crushing blades (13) are provided and fixedly installed on the rotating shaft (7) in a multi-layered ring distribution, and are located below the second scraper (9) and above the mud discharge port (4).

2. The construction mud wastewater purification and treatment device according to claim 1, characterized in that, The linkage transmission mechanism includes: The driving plate (14) has at least two layers and is fixedly installed on the outer wall of the rotating shaft (7) in a ring distribution. Each driving plate (14) is located inside a sleeve (10). The cross-section of the driving plate (14) is hook-shaped, and a first groove (1401) is formed inwardly on the side facing the rotation direction of the rotating shaft (7). The linkage plate (15) is located inside the sleeve (10) and corresponds to the position of the driving plate (14). The cross-section of the linkage plate (15) is also hook-shaped, and a second groove (1501) is formed inwardly on the side facing the driving plate (14). The movable rod (16) is radially inserted through the cylinder wall of the sleeve (10). The inner end of the movable rod (16) is fixedly connected to the linkage plate (15), and the outer end extends to the outside of the sleeve (10) and is fixedly provided with an abutment ring (17). A reset spring (18) is sleeved on the movable rod (16) and located inside the sleeve (10). One end of the reset spring (18) abuts against the linkage plate (15), and the other end abuts against the inner wall of the sleeve (10).

3. The construction mud wastewater purification and treatment device according to claim 2, characterized in that, The reset spring (18) pushes the linkage plate (15) to move closer to the rotating shaft (7) in its natural state, so that the abutment ring (17) abuts against the outer wall of the sleeve (10), while keeping the linkage plate (15) in contact or close to contact with the driving plate (14).

4. The construction mud wastewater purification and treatment device according to claim 3, characterized in that, The driving plate (14) has a first inclined surface (1402), and the linkage plate (15) has a second inclined surface (1502). When the driving member (6) rotates forward, the first inclined surface (1402) of the driving plate (14) and the second inclined surface (1502) of the linkage plate (15) slide into contact, pushing the linkage plate (15) to overcome the elastic force of the return spring (18) and move away from the rotation axis (7), so that the driving plate (14) and the linkage plate (15) disengage. When the driving member (6) rotates in reverse, the first groove (1401) of the driving plate (14) and the second groove (1501) of the linkage plate (15) engage with each other, driving the linkage plate (15) to rotate synchronously with the driving plate (14).

5. The construction mud wastewater purification and treatment device according to claim 1, characterized in that, A positioning ring (19) is fixedly connected to the rotating shaft (7). The outer wall of the positioning ring (19) is provided with annularly distributed docking parts (20). The end of the docking part (20) is provided with a threaded part, which is detachably connected to the positioning ring (19) through the threaded part. The other end of the docking part (20) is detachably connected to the second scraper (9) through a locking part (21). The scraper blade of the second scraper (9) is made of steel and is serrated.

6. The construction mud wastewater purification and treatment device according to claim 1, characterized in that, The hardness of the first scraper (12) is less than that of the second scraper (9).

7. A construction mud wastewater purification and treatment device according to claim 1, characterized in that, The crushing blade (13) is made of steel and is set with the blade facing downward or tilted to the side and downward.

8. A device for purifying and treating construction mud wastewater according to claim 1, characterized in that, The sludge hopper (3) is provided with a support plate (22) inside. The support plate (22) has a cross-shaped cross section. A second bearing (23) is provided inside the support plate (22). The rotating shaft (7) is movably installed on the second bearing (23). The bottom of the sludge discharge port (4) is provided with a threaded sealing switch door (24). The top of the cover plate (5) is symmetrically welded with a support frame (25). The driving component (6) is installed on the top of the support frame (25).

9. A device for purifying and treating construction mud wastewater according to claim 1, characterized in that, The side wall of the settling tank (2) is provided with a feed pipe (26) for conveying mud wastewater into the settling tank (2), and the side wall of the settling tank (2) is provided with a discharge pipe (27), which is connected to a clear liquid collection tank (28) through a conveying pipeline.

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