A solid-liquid separation device for treating cadmium-containing wastewater

Abstract

The present invention relates to the technical field of solid-liquid separation, and in particular to a solid-liquid separation device for treating cadmium-containing wastewater. It comprises: a first movable frame; a screw feeder, mounted on the top of the first movable frame; a fixed frame, symmetrically arranged on the first movable frame; a hollow frame, connected to the fixed frame; a drainage frame, connected to the side of the hollow frame and kept connected; a material guide frame, connected to the top of the hollow frame and kept connected; an arc-shaped filter plate, connected to the material guide frame; and a material guide inclined plate, symmetrically connected to both sides of the material guide frame. The present invention can directly extract the bottom sludge and transport it to the material guide frame without emptying the sewage in the sedimentation tank through the cooperation of a mud pump, a material guide frame and an arc-shaped filter plate, and utilize the reciprocating squeezing action of the pressure plate to make the water in the sludge seep out through the arc-shaped filter plate to achieve solid-liquid separation, and the squeezed dry mud is discharged through the material guide inclined plate, ensuring the continuous and stable operation of the sewage treatment process and improving the overall treatment efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-liquid separation, in particular to a solid-liquid separation device for treating cadmium-containing wastewater. Background Art

[0002] Chemical precipitation is a common treatment method for cadmium-containing wastewater. This involves adding a precipitant to the wastewater to form insoluble cadmium ions, thereby achieving initial removal from the wastewater. However, in practice, this method results in a large amount of heavy metal precipitate deposited at the bottom of the sedimentation tank, forming sludge. If this sludge is not removed promptly, it will affect the effective capacity of the sedimentation tank and the treatment efficiency.

[0003] Existing sludge cleaning methods mainly rely on two means: one is to set up a gantry above the sedimentation tank, and cooperate with the mobile structure and lifting structure to drive the mud pump to move and lift, so that the mud pump can suck the sludge at the bottom; the other is to use a mobile cart to directly drive the mud pump to move at the bottom of the tank and suck the sludge. Although these two methods have their own advantages, they both have obvious defects: First, both methods require the sewage in the sedimentation tank to be emptied before operation. Otherwise, the mud pump will bring out a large amount of unprecipitated sewage while extracting the sludge, causing the sewage treatment process to be interrupted and affecting the subsequent treatment effect. Secondly, frequent drainage and silt removal not only increases operational complexity and operating costs, but also makes the entire sewage treatment process unable to operate continuously and stably, reducing the overall treatment efficiency of the system. Summary of the Invention

[0004] In view of this, the present invention provides a solid-liquid separation device for treating cadmium-containing wastewater, which can overcome the shortcomings of the existing sludge cleaning method that usually requires the sewage in the sedimentation tank to be emptied first, which will cause the entire sewage treatment process to be unable to operate continuously and stably, thereby reducing the overall treatment efficiency.

[0005] The technical solution is as follows: A solid-liquid separation device for treating cadmium-containing wastewater, comprising: a first movable frame; a screw feeder installed on the top of the first movable frame; a fixed frame symmetrically arranged on the first movable frame; a hollow frame connected to the fixed frame; a drainage frame connected to the side of the hollow frame and maintained in communication; a material guide frame connected to the top of the hollow frame and maintained in communication; a curved filter plate connected to the material guide frame; a material guide inclined plate symmetrically connected to both sides of the material guide frame; a first electric push rod installed on both sides of the hollow frame; a connecting plate connected to the telescopic rod of the first electric push rod; a cross bar connected between the connecting plates on both sides, and the cross bar passes through the interior of the material guide frame; a pressure plate connected to the cross bar, and the pressure plate contacts and cooperates with the inner wall of the material guide frame and the top of the curved filter plate; a material extraction component arranged on the first movable frame for extracting sludge in the sedimentation tank; a material blocking component arranged on the material guide frame for blocking both sides of the material guide frame.

[0006] Preferably, the material extraction assembly includes: a second movable frame, which is slidably mounted on the first movable frame, and the fixed frame is fixedly connected to the second movable frame; a second electric push rod, which is mounted on the bottom of the second movable frame; a sleeve, which is sleeved on the outside of the cylinder body of the second electric push rod, and the telescopic rod of the second electric push rod is connected to the sleeve; a mud pump, which is mounted on the bottom of the sleeve; a feeding pipe, which is connected to the discharge port of the mud pump and remains connected, and the upper end of the feeding pipe is located directly above the material guide frame.

[0007] Preferably, the blocking assembly includes: a controller installed on the side of one of the fixed frames; a third electric push rod symmetrically installed on both sides of the material guide frame; a mounting frame connected to the telescopic rod of the third electric push rod; a pressure sensor installed on the inner side of the mounting frame; a baffle connected to the side of the pressure sensor, and the baffle is in contact with the inner wall of the material guide frame.

[0008] Preferably, a flushing assembly is also included, which includes: a sliding rod, which is symmetrically slidably connected to both sides of the hollow frame; a fixed plate, which is connected to one end of the sliding rod, and the fixed plate is in contact with the connecting plate; a connecting spring, which is wound around the outside of the sliding rod, and the two ends of the connecting spring are respectively connected to the fixed plate and the hollow frame; a hollow plate, which is connected to the other end of the sliding rod, and the hollow plate is located inside the hollow frame; a nozzle, which is installed at intervals on the hollow plate; a water supply mechanism, which is arranged inside the hollow frame, and is used to transport water inside the hollow frame to the nozzle for spraying.

[0009] Preferably, the water supply mechanism includes: a water pump, installed on the inner bottom of the hollow frame; a diversion pipe, connected to the water outlet of the water pump and kept connected, and the end of the diversion pipe is connected to the hollow plate and kept connected; an electric control valve, installed on the diversion pipe; a control switch, symmetrically installed on the inner wall of the hollow frame, and the hollow plate is in contact with the control switch.

[0010] Preferably, it also includes: a guide rod, which is symmetrically slidably connected to the drainage frame; a blocking plate, which is connected to the end of the guide rod and contacts the inner wall of the drainage frame; a return spring, which is wound around the outside of the guide rod, and the two ends of the return spring are respectively connected to the drainage frame and the blocking plate.

[0011] Preferably, it further comprises: a square plate connected to the feeding pipe; and an elastic membrane, the two ends of which are respectively connected to the bottom of the square plate and the top of the material guide frame.

[0012] Preferably, it further comprises: scraper plates connected to the outer wall of the sleeve at circumferential intervals.

[0013] The beneficial effects are as follows: 1. The present invention, through the cooperation of the mud pump, the guide frame and the arc filter plate, can directly extract the bottom sludge and transport it to the guide frame without emptying the sewage in the sedimentation tank. The reciprocating squeezing action of the pressure plate is used to make the moisture in the sludge seep out through the arc filter plate to achieve solid-liquid separation, and the squeezed dry mud is discharged through the guide inclined plate, ensuring the continuous and stable operation of the sewage treatment process and improving the overall treatment efficiency.

[0014] 2. The present invention is provided with a flushing component. When the pressure plate moves left and right, the control switch is triggered through the connecting plate, so that the nozzle automatically sprays water to reversely flush the arc filter plate, preventing the filter holes from being blocked by silt, ensuring a long-lasting and stable filtering effect, and reducing the frequency of manual maintenance.

[0015] 3. The present invention utilizes the cooperation of the drainage frame, the blocking plate and the reset spring to automatically discharge the water temporarily stored inside the hollow frame when a certain pressure is reached. At the same time, a small amount of sediment that may be deposited is flushed back to the sedimentation tank to avoid secondary deposition, ensure the long-term stable operation of the system, and reduce the need for manual cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the installation of the hollow frame, drainage frame, material guide frame, connecting plate and cross bar of the present invention.

[0018] Figure 3 It is a schematic diagram of the separation structure of the hollow frame and the material guide frame of the present invention.

[0019] Figure 4 This is a schematic diagram of the installation of the pressure plate and control switch of the present invention.

[0020] Figure 5 This is a schematic diagram of the installation of the extraction component of the present invention.

[0021] Figure 6 This is a schematic diagram of the installation of the blocking component of the present invention.

[0022] Figure 7 This is a schematic diagram of the matching structure of the cross bar, pressure sensor and baffle of the present invention.

[0023] Figure 8 This is a schematic diagram of the installation of the flushing assembly of the present invention.

[0024] Figure 9 This is a schematic diagram of the installation of the guide rod, blocking plate and return spring of the present invention.

[0025] Explanation of the accompanying drawings: 1-first movable frame, 2-screw feeder, 3-fixed frame, 4-hollow frame, 5-drainage frame, 6-material guide frame, 7-arc filter plate, 8-material guide inclined plate, 9-first electric push rod, 10-connecting plate, 11-cross bar, 12-pressing plate, 13-second movable frame, 14-second electric push rod, 15-casing, 16-mud pump, 17-feeding pipe, 18-controller, 19-third electric push rod, 20-mounting frame, 21-pressure sensor, 22-baffle, 23-slide rod, 24-fixed plate, 25-connecting spring, 26-hollow plate, 27-nozzle, 28-water pump, 29-diverter pipe, 30-electrically controlled valve, 31-control switch, 32-guide rod, 33-blocking plate, 34-reset spring, 35-square plate, 36-elastic membrane, 37-scraper plate. DETAILED DESCRIPTION

[0026] Example: A solid-liquid separation device for treating cadmium-containing wastewater, such as Figure 1-Figure 7 As shown, it includes a first movable frame 1, a screw feeder 2, a fixed frame 3, a hollow frame 4, a drainage frame 5, a material guide frame 6, an arc filter plate 7, a material guide inclined plate 8, a first electric push rod 9, a connecting plate 10, a cross bar 11, a pressure plate 12, a material extraction assembly and a material blocking assembly. Two electric wheels are installed on the left and right sides of the lower part of the first movable frame 1, and chutes are opened on both sides of the top of the sedimentation tank. When the device is installed on the top of the sedimentation tank, the electric wheels can just be stuck in the chutes so that the electric wheels can move along the chutes to drive the device to move on the top of the sedimentation tank. A screw feeder 2 is installed on the top of the first movable frame 1, and a fixed frame 3 is provided in the middle of the front and rear sides of the first movable frame 1. A hollow frame 4 is connected between the middle parts of the two fixed frames 3. The top of the hollow frame 4 is an open design. The middle part of the front side of the hollow frame 4 is connected to the drainage frame 5 and remains connected, and the inner bottom height of the hollow frame 4 is the same as the inner bottom height of the drainage frame 5. The top of the material guide frame 6 is provided with an arc-shaped hole, and the top and left and right sides of the material guide frame 6 are open-type designs. The arc-shaped hole at the bottom of the material guide frame 6 is connected with an arc filter plate 7, and the left and right sides of the material guide frame 6 are connected with a material guide inclined plate 8. The front and rear sides of the hollow frame 4 are equipped with a first electric push rod 9, and the telescopic rods of the two first electric push rods 9 are connected with a connecting plate 10. The connecting plate 10 is inclined, and a cross bar 11 is connected between the upper parts of the two connecting plates 10. The cross bar 11 passes through the left and right sides of the material guide frame 6. The middle part of the cross bar 11 is connected with a pressing plate 12, and the pressing plate 12 contacts with the inner wall of the material guide frame 6 and the top of the arc filter plate 7. The first movable frame 1 is provided with a pumping assembly for extracting sludge inside the sedimentation tank, and the material guide frame 6 is provided with a blocking assembly for blocking its left and right sides.

[0027] like Figure 5As shown, the pumping assembly includes a second movable frame 13, a second electric push rod 14, a sleeve 15, a mud pump 16 and a feeding pipe 17. The second movable frame 13 is provided in the middle of the first movable frame 1, and four electric wheels are installed on the upper part of the second movable frame 13. The four electric wheels are in contact with the top of the first movable frame 1 so that the electric wheels can drive the second movable frame 13 to move left and right along the first movable frame 1, and the fixed frame 3 is fixedly connected to the second movable frame 13. The second electric push rod 14 is installed at the bottom of the second movable frame 13, and the outer side of the cylinder body of the second electric push rod 14 is sleeved with a sleeve 15, and the telescopic rod of the second electric push rod 14 is connected to the inner wall of the sleeve 15. The mud pump 16 is installed at the bottom of the sleeve 15, and the feeding pipe 17 is connected to the discharge port of the mud pump 16 and remains connected, and the upper end of the feeding pipe 17 is located directly above the guide frame 6.

[0028] like Figure 6 and Figure 7 As shown, the blocking assembly includes a controller 18, a third electric push rod 19, a mounting frame 20, a pressure sensor 21 and a baffle 22. The controller 18 is installed on the upper front part of the front fixing frame 3. The third electric push rods 19 are installed symmetrically on the front and rear sides of the material guide frame 6. The mounting frame 20 is connected between the telescopic rods of the two third electric push rods 19 on the left, and the mounting frame 20 is also connected between the telescopic rods of the two third electric push rods 19 on the right. The two mounting frames 20 are respectively located on the left and right sides of the material guide frame 6, and pressure sensors 21 are installed on the inner sides of the two mounting frames 20. The two pressure sensors 21 are connected to the side close to the material guide frame 6 with baffles 22, and the two baffles 22 are in contact with the inner wall of the material guide frame 6 and block the left and right sides of the material guide frame 6 respectively.

[0029] When the device is needed, it can be directly installed on the top of the sedimentation tank, so that the electric wheel on the first movable frame 1 is stuck in the chute on the top of the sedimentation tank; when the sludge inside the sedimentation tank needs to be cleaned, the second electric push rod 14 is first controlled by the controller 18 to drive the sleeve 15 to move downward, and the sleeve 15 can drive the mud pump 16 to move downward to the bottom of the sedimentation tank, and then the mud pump 16 is controlled by the controller 18 to start working, and the mud pump 16 can extract the sludge at the bottom of the sedimentation tank and send it to the bottom of the sedimentation tank through the feeding pipe 17. The silt is transported upward to the guide frame 6, so that the silt falls on the top of the curved filter plate 7; at this time, the controller 18 can control the first electric push rod 9 to drive the connecting plate 10 to intermittently reciprocate left and right, and the connecting plate 10 can drive the cross bar 11 and the pressure plate 12 to intermittently reciprocate left and right. When the pressure plate 12 moves to the left, it can push the silt on the top of the curved filter plate 7 to move to the left. When the pressure plate 12 moves to the left and contacts the inner wall on the left side of the guide frame 6, the pressure plate 12, the guide frame 6, the curved filter plate 7 and the baffle 22 on the left can form a A cylindrical space, and the silt is located inside the cylindrical space. As the pressure plate 12 continues to move to the left, the pressure plate 12 squeezes the silt to make its water seep out. The water can pass through the arc filter plate 7 and fall down into the hollow frame 4, and is discharged back into the sedimentation tank through the drainage frame 5, while the silt remains inside the cylindrical space. At the same time, the pressure sensor 21 on the left can monitor the pressure on the silt in real time. When the pressure detected by the pressure sensor 21 on the left is greater than the preset value, it means that the water in the silt is basically squeezed out. At this time, the pressure on the left is The sensor 21 will send a signal. After receiving the signal, the controller 18 will control the third electric push rod 19 on the left to drive the installation frame 20 on the left to move a specified distance to the left. The installation frame 20 on the left drives the pressure sensor 21 on the left and the baffle 22 on the left to move a specified distance to the left, so that the baffle 22 on the left is separated from the left side of the guide frame 6. At this time, the pressure plate 12 continues to move to the left, which can push the silt to the left, so that the silt falls down along the left guide inclined plate 8 into the screw feeder 2, and the silt can be transported to the right by the screw feeder 2.In the process of the pressing plate 12 moving to the left to squeeze the silt, the feeding pipe 17 will continue to transport the silt to the top of the curved filter plate 7, and the silt on the top of the curved filter plate 7 is located on the right side of the pressing plate 12, so when the pressing plate 12 moves to the right, similarly, the pressing plate 12 can push the silt on the top of the curved filter plate 7 to the right, and with the cooperation of the right baffle 22, it can squeeze the silt to complete the solid-liquid separation of the silt, and in the process of the pressing plate 12 moving to the right, the controller 18 will control the third electric push rod 19 on the left to drive the installation frame 20 on the left to move the specified distance to the right to reset, and the installation frame 20 on the left drives the pressure sensor 21 on the left and the left The baffle 22 moves rightward a specified distance and resets, allowing the left baffle 22 to re-block the left side of the guide frame 6. This reciprocating process allows the sewage to undergo chemical precipitation treatment while the sludge in the sewage is discharged separately. When the sludge pump 16 extracts the sludge in the sedimentation tank, the movement of the first movable frame 1 and the second movable frame 13 drives the sludge pump 16 to move forward, backward, left, and right within the sedimentation tank, ensuring that the sludge in the sedimentation tank can be fully extracted. This sludge treatment method does not require interrupting the chemical precipitation treatment of the sewage and does not discharge a large amount of unprecipitated sewage, thereby ensuring the sewage treatment effect and efficiency.

[0030] like Figure 8 As shown, it also includes a flushing assembly, which includes a slide rod 23, a fixed plate 24, a connecting spring 25, a hollow plate 26, a nozzle 27 and a water supply mechanism. Two slide rods 23 are slidably connected to the upper left and right sides of the hollow frame 4. A fixed plate 24 is connected between the ends of the two slide rods 23, and the fixed plate 24 is in contact with the connecting plate 10. A connecting spring 25 is wound around the outside of the slide rod 23, and the two ends of the connecting spring 25 are respectively connected to the fixed plate 24 and the hollow frame 4. A hollow plate 26 is connected between the other ends of the two slide rods 23. The shape of the hollow plate 26 is arc-shaped, and the hollow plate 26 is located inside the hollow frame 4. The hollow plate 26 is located below the arc-shaped filter plate 7. A plurality of nozzles 27 are installed at intervals on the top of each hollow plate 26, and a water supply mechanism is provided inside the hollow frame 4 for transporting water to the nozzles 27 for spraying; the water supply mechanism includes a water pump 28, a diverter pipe 29, an electric control valve 30 and a control switch 31. A water pump 28 is installed in the middle of the inner bottom of the hollow frame 4, and the water outlet of the water pump 28 is connected to the diverter pipe 29 and maintained in communication. The diverter pipe 29 is a hose, and the left and right ends of the diverter pipe 29 are respectively connected to the bottom of the two hollow plates 26 and maintained in communication. The electric control valve 30 is installed on the diverter pipe 29, and the control switches 31 are installed on the upper left and right sides of the inner wall of the hollow frame 4, and the hollow plate 26 is in contact with the control switch 31.

[0031] In the initial state, the left and right hollow plates 26 are respectively in contact with the control switches 31 on both sides, the electric control valve 30 is in the closed state, and the water pump 28 is in a disconnected state with the hollow plate 26; when the connecting plate 10 moves to the left, it can drive the pressure plate 12 to move to the left to squeeze the silt. At the same time, the right connecting plate 10 will squeeze the right fixed plate 24 to move to the left, driving the right sliding rod 23, the right hollow plate 26 and the right nozzle 27 to move to the left, and the right connecting spring 25 is compressed. At this time, the hollow plate 26 on the right is in the closed state. The core plate 26 will be disconnected from the control switch 31 on the right, and the control switch 31 on the right will send a signal. After receiving the signal, the controller 18 will control the electric control valve 30 to open, so that the water pump 28 can be connected to the hollow plate 26 on the right through the shunt pipe 29, and control the water pump 28 to start working. The water pump 28 can extract water from the inside of the hollow frame 4 and transport the water to the nozzle 27 on the right through the shunt pipe 29 and the hollow plate 26 on the right, so that the nozzle 27 on the right can spray water upwards to the arc filter in the process of moving to the left. The right half of the bottom of the plate 7 is reversely flushed. When the connecting plate 10 moves to the right, the connecting plate 10 on the right will be separated from the fixed plate 24 on the right. At this time, the connecting spring 25 on the right will return to its original state, driving the connecting plate 10 on the right, the sliding rod 23 on the right, the hollow plate 26 on the right and the nozzle 27 on the right to move to the right and reset. At this time, the nozzle 27 on the right is still in the state of spraying water upward to perform a secondary flush on the right half of the bottom of the curved filter plate 7. When the hollow plate 26 on the right is connected to the control switch 31 on the right, the nozzle 27 on the right will be flushed again. When touched, the control switch 31 on the right sends a signal. After receiving the signal, the controller 18 will control the electric control valve 30 to close, so that the water pump 28 is no longer connected to the hollow plate 26 on the right, and the water pump 28 is controlled to stop working, so that the nozzle 27 on the right no longer sprays water, and the connecting plate 10 continues to move to the right. Similarly, the nozzle 27 on the left can spray water upward to rinse the left half of the bottom of the curved filter plate 7. This reciprocating process can prevent the filter holes of the curved filter plate 7 from being blocked by silt, thereby ensuring the filtering effect and filtering efficiency of the curved filter plate 7.

[0032] like Figure 9 As shown, it also includes a guide rod 32, a blocking plate 33 and a return spring 34. Two guide rods 32 are slidably connected to the upper front side of the drainage frame 5. A blocking plate 33 is connected between the rear ends of the two guide rods 32, and the blocking plate 33 is in contact with the inner wall of the drainage frame 5. The outer sides of the two guide rods 32 are wound with a return spring 34, and the two ends of the return spring 34 are respectively connected to the drainage frame 5 and the blocking plate 33.

[0033] When the water squeezed out from the sludge falls down into the hollow frame 4 through the arc filter plate 7, the blocking plate 33 will block the inside of the drainage frame 5, so that the water inside the hollow frame 4 will not be discharged back into the sedimentation tank temporarily. As the water inside the hollow frame 4 increases, the water pressure inside the hollow frame 4 will gradually increase. When the thrust generated by the water pressure inside the hollow frame 4 is greater than the elastic force of the return spring 34, the water inside the hollow frame 4 will squeeze the blocking plate 33 and the guide rod 32 to move forward, and the return spring 34 will be compressed, so that the blocking plate 33 no longer blocks the inside of the drainage frame 5. At this time, the water inside the hollow frame 4 can be discharged back into the sedimentation tank through the drainage frame 5. When the thrust generated by the water pressure inside the hollow frame 4 is less than the elastic force of the return spring 34, the return spring 34 will return to its original state, driving the blocking plate 33 to move forward. 3 and the guide rod 32 move backward to reset, so that the blocking plate 33 blocks the inside of the drainage frame 5 again, so as to ensure that there is always a certain amount of water in the hollow frame 4 for the water pump 28 to extract, and the flushing effect of the curved filter plate 7 can be guaranteed; since most of the water in the hollow frame 4 is sewage that has not completed sedimentation, the sewage temporarily stored in the hollow frame 4 may precipitate. Since the inner bottom height of the hollow frame 4 is the same as the inner bottom height of the drainage frame 5, when the blocking plate 33 no longer blocks the inside of the drainage frame 5, the water in the hollow frame 4 will pass through the drainage frame 5 and be discharged back into the sedimentation tank. At this time, the water in the hollow frame 4 will flush the sediment inside it into the drainage frame 5 and be discharged back into the sedimentation tank, so that the sediment inside the hollow frame 4 can be automatically cleaned.

[0034] like Figure 1 As shown, it also includes a square plate 35 and an elastic membrane 36. The upper part of the feed pipe 17 is connected to the square plate 35, and the elastic membrane 36 is connected between the bottom of the square plate 35 and the top of the guide frame 6. When the second electric push rod 14 drives the mud pump 16 to move up and down, the mud pump 16 will drive the feed pipe 17 and the square plate 35 to move up and down synchronously, and the elastic membrane 36 can adaptively expand and contract so that the elastic membrane 36 can always block the gap between the square plate 35 and the guide frame 6 to prevent silt from splashing. And cause pollution to the device; it also includes a scraper plate 37, and four scraper plates 37 are connected to the outer wall of the sleeve 15 at circumferential intervals. When the device is processing the sludge in the sedimentation tank, the sleeve 15 can be controlled to move close to the inner wall of the sedimentation tank so that the scraper plate 37 contacts the inner wall of the sedimentation tank, and then the sleeve 15 is controlled to move along the inner wall of the sedimentation tank in a circle, so that the scraper plate 37 can scrape off the sludge adhering to the inner wall of the sedimentation tank, and there is no need to manually clean the sludge adhering to the inner wall of the sedimentation tank.

Claims

1. A solid-liquid separation device for treating cadmium-containing wastewater, comprising: a first movable frame (1); a screw feeder (2), mounted on the top of the first movable frame (1); characterized in that: The invention also includes: a fixed frame (3) symmetrically arranged on the first movable frame (1); a hollow frame (4) connected to the fixed frame (3); a drainage frame (5) connected to the side of the hollow frame (4) and maintained in communication; a material guide frame (6) connected to the top of the hollow frame (4) and maintained in communication; an arc filter plate (7) connected to the material guide frame (6); a material guide inclined plate (8) symmetrically connected to both sides of the material guide frame (6); a first electric push rod (9) respectively installed on both sides of the hollow frame (4); a connecting plate (10) connected to the telescopic rod of the first electric push rod (9); a cross bar (11) connected between the connecting plates (10) on both sides, and the cross bar (11) passes through the interior of the material guide frame (6); a pressing plate (12) connected to the cross bar ( 11), and the pressure plate (12) contacts and cooperates with the inner wall of the guide frame (6) and the top of the arc filter plate (7); the extraction component is arranged on the first movable frame (1) and is used to extract the sludge in the sedimentation tank; the blocking component is arranged on the guide frame (6) and is used to block both sides of the guide frame (6); the extraction component includes: a second movable frame (13), which is slidably mounted on the first movable frame (1), and the fixed frame (3) is fixedly connected to the second movable frame (13); a second electric push rod (14), which is mounted on the bottom of the second movable frame (13); a sleeve (15), which is sleeved on the outside of the cylinder body of the second electric push rod (14), and the telescopic rod of the second electric push rod (14) is connected to the sleeve (15); a mud pump (16), which is mounted on the sleeve (15); a feeding pipe (17) connected to the discharge port of the mud pump (16) and kept in communication, and the upper end of the feeding pipe (17) is located just above the material guide frame (6); the blocking component includes: a controller (18) installed on the side of one of the fixing frames (3); a third electric push rod (19) symmetrically installed on both sides of the material guide frame (6); a mounting frame (20) connected to the telescopic rod of the third electric push rod (19); a pressure sensor (21) installed on the inner side of the mounting frame (20); a baffle (22) connected to the side of the pressure sensor (21), and the baffle (22) contacts the inner wall of the material guide frame (6); and a flushing component, which includes: a slide rod (23) symmetrically slidingly connected to the inner wall of the material guide frame (6). connected to both sides of the hollow frame (4); a fixed plate (24) connected to one end of the slide rod (23), and the fixed plate (24) is in contact with the connecting plate (10); a connecting spring (25) wound around the outside of the slide rod (23), and the two ends of the connecting spring (25) are respectively connected to the fixed plate (24) and the hollow frame (4); a hollow plate (26) connected to the other end of the slide rod (23), and the hollow plate (26) is located inside the hollow frame (4); a nozzle (27) is installed on the hollow plate (26) at intervals; a water supply mechanism is provided inside the hollow frame (4) for transporting water inside the hollow frame (4) to the nozzle (27) for spraying; the water supply mechanism includes: a water pump (28) installed at the inner bottom of the hollow frame (4);The shunt pipe (29) is connected to the water outlet of the water pump (28) and maintained in communication, and the end of the shunt pipe (29) is connected to the hollow plate (26) and maintained in communication; the electric control valve (30) is installed on the shunt pipe (29); the control switch (31) is symmetrically installed on the inner wall of the hollow frame (4), and the hollow plate (26) is in contact with the control switch (31).

2. A solid-liquid separation device for treating cadmium-containing wastewater according to claim 1, characterized in that: The utility model further comprises: a guide rod (32) symmetrically slidably connected to the drainage frame (5); a blocking plate (33) connected to the end of the guide rod (32), and the blocking plate (33) contacts the inner wall of the drainage frame (5); and a return spring (34) wound around the outer side of the guide rod (32), and the two ends of the return spring (34) are respectively connected to the drainage frame (5) and the blocking plate (33).

3. A solid-liquid separation device for treating cadmium-containing wastewater according to claim 1, characterized in that: It also includes: a square plate (35) connected to the feeding pipe (17); and an elastic membrane (36) with two ends respectively connected to the bottom of the square plate (35) and the top of the material guide frame (6).

4. A solid-liquid separation device for treating cadmium-containing wastewater according to claim 1, characterized in that: It also includes a scraper plate (37) connected to the outer wall of the sleeve (15) at circumferential intervals.

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