A negative pressure sewage treatment device and process

Abstract

The present application relates to the technical field of sewage treatment, and specifically relates to a negative pressure sewage treatment device and process, which comprises a treatment tank, a negative pressure connecting pipe for connecting a negative pressure pump is arranged at the top of the treatment tank, and a sewage inlet is further connected to the treatment tank; a sundry separation assembly and a sundry collection assembly are arranged in the treatment tank; the sundry separation assembly comprises a filter cartridge, the filter cartridge is rotatably arranged in the treatment tank through a fixing frame fixedly installed in the treatment tank; a squeezing roller is arranged in the filter cartridge and is used for rolling along the inner wall of the filter cartridge to squeeze sundries attached to the inner wall of the filter cartridge; a driving assembly is connected with the filter cartridge and the squeezing roller and is used for driving the filter cartridge to rotate; a mud receiving plate is arranged inside the filter cartridge and receives the squeezed sundries falling from the highest part of the filter cartridge; and the sundry collection assembly collects the sundries on the mud receiving plate. The present application has the effect of reducing the moisture content of filtered sundries by filtering the sundries through the filter cartridge and then squeezing the sundries by the squeezing roller.

Description

Technical Field

[0001] This invention relates to the technical field of wastewater treatment, and specifically to a negative pressure wastewater treatment device and process. Background Technology

[0002] In the processes of machining, food production, textile printing and dyeing, and urban wastewater treatment, large amounts of wastewater containing solid impurities, fibers, and fine particles are often generated. Due to their small particle size, large specific surface area, and strong water retention capacity, these impurities are difficult to completely separate from water during treatment, easily forming sludge with high water content and large volume, which significantly increases the difficulty and operating cost of subsequent solid waste disposal.

[0003] Chinese patent CN213202671U discloses a vacuum negative pressure wastewater recycling device, including a treatment tank, a vacuum pump, an inlet pipe, an outlet pipe, and a sealing mechanism. The inlet and outlet pipes are connected to the top of the treatment tank, and the sealing mechanism is located inside the inlet and outlet pipes. The vacuum pump establishes and maintains negative pressure inside the tank, and the sealing mechanism in the inlet and outlet pipes achieves sealing during the wastewater inflow and outflow process, reducing energy consumption. Simultaneously, mounting blocks are fixedly connected between the inner walls of both sides of the treatment tank. Two first springs are fixedly connected to the upper surface of the mounting blocks, and filter screens are fixedly connected to the other ends of the two first springs. One side of the filter screen is fixedly connected to the inner wall of one edge of the treatment tank. Through the inclined design of the filter screen, the accumulated solid waste on the filter screen automatically slides and is collected inside the collection box.

[0004] However, during the filtration process, debris in the wastewater may adhere to a large amount of wastewater due to its size or water absorption capacity, resulting in a high water content in the debris. The debris rolls down the filter screen into the collection box for collection, while also collecting a large amount of wastewater, which brings greater difficulties to the subsequent debris treatment and increases the treatment cost. Summary of the Invention

[0005] This invention provides a negative pressure sewage treatment device and process, which aims to solve the problem that some of the impurities filtered out in the prior art have a high water content.

[0006] This invention discloses a negative pressure wastewater treatment device, comprising a treatment tank, a negative pressure connecting pipe for connecting a negative pressure pump is provided on the top of the treatment tank, and a wastewater inlet is also connected to the treatment tank; further comprising:

[0007] A debris separation assembly and a debris collection assembly are disposed within the processing tank; the debris separation assembly includes:

[0008] The filter cartridge is rotatably mounted inside the treatment tank via a fixed bracket that is fixedly installed inside the treatment tank.

[0009] A squeeze roller is disposed inside the filter cylinder and is used to roll along the inner wall of the filter cylinder to squeeze out the debris adhering to the inner wall of the filter cylinder.

[0010] A drive assembly, connected to the filter cartridge and the extrusion roller, is used to drive the filter cartridge to rotate and drive the extrusion roller to roll along the inner wall of the filter cartridge;

[0011] The mud receiving plate is installed inside the filter cylinder and collects the squeezed debris that falls from the highest point of the filter cylinder.

[0012] The debris collection component is located at one end of the mud receiving plate and collects debris on the mud receiving plate.

[0013] Its effect is as follows: The treatment tank is kept under negative pressure by a negative pressure pump, and the sewage at the sewage inlet is sucked into the treatment tank by the negative pressure. The sewage first reaches the inside of the debris separation component, which includes a filter cylinder and a squeezing roller. The sewage enters the filter cylinder, and the filter cylinder can filter the debris in the sewage through the filtration effect of the filter cylinder. At the same time, the filter cylinder is kept rotating under the action of the drive component, so that the debris can be evenly spread on the inner wall of the filter cylinder. Under the action of the drive component, the squeezing roller revolves around the center line of the filter cylinder. As the squeezing roller rolls along the inner wall of the filter cylinder, it squeezes the debris attached to the inner wall of the filter cylinder, so that the sewage in the debris flows out further. The debris falls off due to gravity when the filter cylinder rotates to the highest point of the filter cylinder and falls onto the mud receiving plate. Finally, the debris is collected by the debris collection component on the mud receiving plate, thereby reducing the moisture content of the debris and reducing the difficulty and cost of subsequent debris treatment.

[0014] Preferably, the driving component is used to drive the angular velocity of the extrusion roller to be greater than the angular velocity of the filter cartridge, and the direction of the extrusion roller's revolution is the same as the direction of the filter cartridge's rotation.

[0015] Its effect is that the angular velocity of the driving component driving the squeezing roller is greater than the angular velocity of the filter cartridge rotation. During the slow rotation of the debris in the filter cartridge, it is squeezed by the squeezing roller multiple times, so that excess sewage can be squeezed out more fully.

[0016] Preferably, the driving component includes:

[0017] A central shaft, one end of which extends out of the processing tank and is connected to a drive motor;

[0018] An elastic telescopic arm is radially disposed inside the filter cylinder, with one end connected to the central shaft and the other end rotatably mounted with the extrusion roller;

[0019] A planetary gear set, which connects the central shaft and the filter cartridge, is used to drive the filter cartridge to rotate in the same direction at a speed lower than that of the central shaft when the central shaft rotates.

[0020] Its effect is as follows: the central shaft is connected to the drive motor, and the central shaft rotates under the action of the drive motor. The central shaft makes the filter cylinder rotate through the planetary gear set. At the same time, the central shaft can also directly drive the extrusion roller to roll along the inner wall of the filter cylinder through the elastic telescopic arm. The elastic telescopic arm can make the extrusion roller have the extrusion force to extrude impurities.

[0021] Preferably, the filter cartridge further includes a mud-pushing assembly, which is positioned at the highest point of the filter cartridge's rotation path. When the extrusion roller revolves with the central axis to the highest point of the filter cartridge, the mud-pushing assembly is used to restrict the rotation of the extrusion roller, so that the extrusion roller pushes the extruded debris on the inner wall of the filter cartridge and causes it to fall off.

[0022] Preferably, the mud-pushing assembly includes an arc-shaped rack fixed on the fixed frame and a connecting gear fixed coaxially with the extrusion roller; when the extrusion roller moves to the highest point of the filter cylinder, the connecting gear meshes with the arc-shaped rack.

[0023] Its effect is that when the connecting gear meshes with the arc-shaped rack, the connecting gear makes the rotation speed of the squeezing roller different from the relative rolling speed of the squeezing roller against the inner wall of the filter cylinder. As a result, the squeezing roller not only clamps the squeezed debris against the inner wall of the filter cylinder, but also pushes the debris to slide relative to the inner wall of the filter cylinder. This makes it easier for the debris to fall off the inner wall of the filter cylinder and facilitates collection.

[0024] Preferably, it further includes an adjustment component for adjusting the position of the elastic telescopic arm to change the squeezing force of the extrusion roller on the inner wall of the filter cylinder during rolling; a fixing sleeve is fixedly provided on the fixing frame, the fixing sleeve is located inside the filter cylinder, the adjustment component includes a cam disk fixedly connected to the fixing sleeve, and a roller installed on the elastic telescopic arm, the cam disk has a cam groove, and the roller rolls in the cam groove.

[0025] Its effect is as follows: the cam disc is fixedly set on the fixed sleeve. When the roller rolls along the cam groove on the cam disc, the distance between the end of the elastic telescopic arm with the roller and the center of the filter cylinder changes, thereby adjusting the squeezing pressure of the squeezing roller on the inner wall of the filter cylinder. By gradually increasing the squeezing of impurities, the sewage can be squeezed more thoroughly. At the same time, controlling the amount of squeezing each time can reduce the operating resistance.

[0026] Preferably, a connecting rod is fixedly provided on the side wall of one end of the elastic telescopic arm where the extrusion roller is mounted, and a scraper is fixedly provided on the connecting rod. The scraper abuts against the side wall of the extrusion roller and is used to clean debris on the periphery of the extrusion roller.

[0027] Preferably, a pusher plate is provided at the end of the mud receiving plate away from the debris collection assembly, and the pusher plate is connected to a cylinder. The debris collection assembly includes a box and a horizontally sliding receiving plate. A screw conveyor is provided at the bottom of the box and extends to the outside of the box. The screw conveyor is used to transport the debris inside the box to the outside of the processing tank.

[0028] Its effect is that the pusher plate moves from one end of the receiving plate to the other under the action of the cylinder, and the receiving plate can transfer the debris pushed out of the receiving plate into the box. Finally, the debris is discharged from the processing tank periodically by the screw conveyor.

[0029] Preferably, at least one sewage inlet is provided on the peripheral wall of the filter cartridge, and a cover is provided at the sewage inlet. An opening cylinder is provided at the position of the sewage inlet of the treatment tank to open the cover. The opening cylinder opens the cover into the filter cartridge. The cover is rotatably connected to the sewage inlet and the cover is reset to close the sewage inlet by a reset member installed on the cover.

[0030] Its effect is as follows: when sewage needs to be sent into the filter cartridge, the sewage inlet on the filter cartridge rotates to the opening cylinder, the opening cylinder extends and abuts against the cover, causing the cover to rotate into the filter cartridge to open the sewage inlet; after the sewage has entered, the opening cylinder retracts, and the cover automatically resets and closes the sewage inlet under the action of the reset component.

[0031] This invention also discloses a negative pressure wastewater treatment process, comprising the following steps:

[0032] Under the negative pressure inside the treatment tank, sewage is drawn into a rotating filter cartridge, allowing the sewage to be filtered out through the peripheral wall of the filter cartridge, while impurities are trapped on the inner wall of the filter cartridge.

[0033] A squeezing roller disposed inside the filter cylinder rolls along the inner wall of the filter cylinder to continuously squeeze and dehydrate the impurities attached to the inner wall.

[0034] At the highest point of the rotation path of the filter cartridge, the impurities after squeezing and dehydration are peeled off from the inner wall of the filter cartridge;

[0035] Collect and drain the stripped debris.

[0036] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0037] This invention uses negative pressure to draw sewage from the inlet into the treatment tank. The sewage first enters the filter cartridge, which filters out impurities from the sewage. A squeezing roller, driven by a drive assembly, revolves around the center line of the filter cartridge. As the squeezing roller rolls along the inner wall of the filter cartridge, it squeezes the impurities attached to the inner wall, expelling the sewage from the impurities. This reduces the moisture content of the impurities and eases the difficulty of subsequent impurity treatment. When the connecting gear meshes with the arc-shaped rack, the connecting gear causes the rotational speed of the squeezing roller to differ from the relative rolling speed of the squeezing roller against the inner wall of the filter cartridge. This means the squeezing roller not only clamps the squeezed impurities against the inner wall of the filter cartridge but also pushes the impurities to slide relative to the inner wall, making it easier for the impurities to detach from the inner wall of the filter cartridge and collect. As the roller rolls along the cam groove on the cam disc, the distance between the end of the elastic telescopic arm with the roller and the center of the filter cartridge changes, thereby adjusting the squeezing pressure of the squeezing roller on the inner wall of the filter cartridge. By gradually increasing the squeezing of impurities, the sewage can be squeezed more thoroughly. At the same time, controlling the amount of squeezing each time can reduce operating resistance. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the external shape of a negative pressure sewage treatment device according to the present invention;

[0039] Figure 2 This is a schematic diagram of the internal structure of the processing tank in an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the structure of the debris separation component in an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the internal structure of the filter cartridge in an embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the planetary gear set in an embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the installation position of the mud-pushing component in an embodiment of the present invention;

[0044] Figure 7 yes Figure 3 A magnified view of part A in the middle;

[0045] Figure 8 This is a schematic diagram showing the position of the cover in an embodiment of the present invention;

[0046] Figure 9 This is a schematic diagram of the debris collection component in an embodiment of the present invention.

[0047] Figure label:

[0048] 1. Treatment tank; 11. Negative pressure connection pipe; 12. Sewage discharge pipe; 13. Sewage inlet; 2. Debris separation assembly; 21. Filter cartridge; 211. Sewage inlet; 212. Cover; 2121. Opening cylinder; 22. Squeezing roller; 221. Connecting rod; 222. Scraper; 23. Annular plate; 3. Debris collection assembly; 31. Box; 32. Receiving plate; 33. Screw conveyor; 34. Control valve; 4. Fixing frame; 51. Central shaft; 52. Elastic Telescopic boom; 53, planetary gear set; 531, sun gear; 532, first planetary gear; 533, second planetary gear; 534, planetary carrier; 535, gear ring; 536, fixed sleeve; 54, drive motor; 6, mud receiving plate; 61, fixed rod; 7, mud pushing assembly; 71, arc rack; 72, connecting gear; 8, mud pushing plate; 9, adjusting assembly; 91, cam plate; 92, guide sleeve; 93, roller; 94, clearance groove; 95, cam groove. Detailed Implementation

[0049] The following is combined Figures 1 to 9 Embodiments of the present invention will be described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the invention.

[0050] This embodiment discloses a negative pressure sewage treatment device, such as Figure 1 As shown, the device includes a treatment tank 1, which is placed horizontally. A negative pressure connection pipe 11 is installed at the top of the treatment tank 1, and a drain pipe 12 is installed at the bottom of the treatment tank 1. The drain pipe 12 is used to discharge the treated wastewater in the treatment tank 1 to the next stage for further treatment. The negative pressure connection pipe 11 is used to connect to a negative pressure pump, which creates a negative pressure inside the treatment tank 1. A wastewater inlet 13 is also connected to the treatment tank 1. A solenoid valve is installed on the wastewater inlet 13. The solenoid valve opens when wastewater needs to be pumped into the treatment tank 1, allowing the wastewater to enter the treatment tank 1 through the wastewater inlet 13 for treatment.

[0051] refer to Figure 2 The treatment tank 1 is equipped with a debris separation component 2 and a debris collection component 3. The wastewater entering the treatment tank 1 has already undergone one or more filtrations. The debris separation component 2 is mainly for debris with a diameter of 0.2 to 1 mm. Because these debris still have a large surface water content after filtration, they are difficult to remove, resulting in a large amount of solid waste that is difficult to treat. The debris collection component 3 is located on one side of the debris separation component 2, so that the debris separated by the debris separation component 2 is collected before being discharged in a centralized manner.

[0052] refer to Figure 3 , Figure 4 and Figure 5The impurity separation assembly 2 includes a filter cylinder 21 and a squeezing roller 22 disposed inside the filter cylinder 21. The filter cylinder 21 is rotatably connected to the treatment tank 1 via a fixing frame 4. The rotation axis of the filter cylinder 21 is horizontally arranged and parallel to the center line of the treatment tank 1. The fixing frame 4 can be fixed to the inner wall of the treatment tank 1 by welding. The outer peripheral wall of the filter cylinder 21 has filter holes (not shown in the attached figure) to filter out moisture from the impurities; or a filter cloth can be fixed on the outer or inner peripheral wall of the filter cylinder 21. Annular plates 23 are provided at both ends of the filter cylinder 21. The annular plates 23 are located inside the filter cylinder 21. Wastewater entering the filter cylinder 21 is contained within the filter cylinder 21 and filtered through the peripheral wall of the filter cylinder 21. The squeeze roller 22 rolls along the inner wall of the filter cylinder 21, simultaneously squeezing the impurities filtered out from the inner wall of the filter cylinder 21, further separating the wastewater from the impurities. Smaller impurities in the wastewater, such as suspended solids, will be filtered out along with the wastewater through the peripheral wall of the filter cylinder 21. Most of the wastewater will flow out from the side of the inner wall of the filter cylinder 21 that has not been squeezed by the squeeze roller 22. Therefore, as the filter cylinder 21 rotates, the impurities in the wastewater can be evenly spread on the inner wall of the filter cylinder 21 for the squeeze roller 22 to squeeze. When the impurity content in the wastewater is low, the rotation speed of the filter cylinder 21 can be reduced; when the impurity content in the wastewater is high, the rotation speed of the filter cylinder 21 can be increased. The impurity content can be detected by a sensor before the wastewater enters the treatment tank 1.

[0053] refer to Figure 2 , Figure 3 and Figure 4 The filter cartridge 21 and the extrusion roller 22 are connected to a drive assembly, which is used to drive the filter cartridge 21 and the extrusion roller 22 to rotate. The drive assembly includes a central shaft 51, an elastic telescopic arm 52 and a planetary gear set 53. One end of the central shaft 51 extends out of the outer wall of the processing tank 1 and is connected to a drive motor 54, which drives the central shaft 51 to rotate. The other end is coaxial with the filter cartridge 21 and inserted into the filter cartridge 21. The elastic telescopic arm 52 is arranged radially along the filter cartridge 21. One end of the elastic telescopic arm 52 is fixed on the central shaft 51, and the other end is used to rotatably connect to the extrusion roller 22. When the drive motor 54 rotates, the central shaft 51 will simultaneously drive the elastic telescopic arm 52 to rotate around the axis of the central shaft 51. The squeeze roller 22 is close to the inner wall of the filter cylinder 21, so that the squeeze roller 22 revolves around the axis of the filter cylinder 21 inside the filter cylinder 21, and at the same time rotates around its own axis. During the two movements of the squeeze roller 22 revolving relative to the filter cylinder 21 and the squeeze roller 22 rotating, the squeeze roller 22 squeezes the impurities filtered out on the inner wall of the filter cylinder 21, so that the impurities stick to the inner wall of the filter cylinder 21 and reach the highest point of the filter cylinder 21.

[0054] refer to Figure 5The planetary gear set 53 includes a sun gear 531, a first planet gear 532, a second planet gear 533, a planet carrier 534, and a ring gear 535. The sun gear 531 is coaxially fixed to the central shaft 51. The planet carrier 534 has a configuration on both end faces of the sun gear 531, and the first planet gear 532 and the second planet gear 533 are rotatably mounted on the planet carrier 534. There are three of each of the first planet gear 532 and the second planet gear 533. The planet carrier 534 is fixedly connected to the fixed frame 4 and does not rotate. The first planet gear 532 and the second planet gear 533 mesh in a one-to-one correspondence. The first planet gear 532 meshes with the sun gear 531, and the second planet gear 533 meshes internally with the ring gear 535. When the central shaft 51 rotates, the sun gear 531 drives the ring gear 535 to rotate through the first planet gear 532 and the second planet gear 533. One of the annular plates 23 at both ends of the filter cylinder 21 is fixed coaxially with the filter cylinder 21, and the other is rotatably mounted with the filter cylinder 21 and fixedly connected to the fixing frame 4. The annular plate 23 fixed to the filter cylinder 21 is coaxially fixed with the gear ring 535, so that the filter cylinder 21 also rotates at the same time, and the rotation direction of the filter cylinder 21 is the same as that of the central shaft 51. The rotation speed of the central shaft 51 is greater than that of the filter cylinder 21. In this embodiment, the transmission ratio between the central shaft 51 and the filter cylinder 21 is greater than or equal to 10, so that the impurities can be squeezed multiple times as they move from the bottom of the filter cylinder 21 to the highest point of the filter cylinder 21.

[0055] refer to Figure 4 A fixing sleeve 536 is provided at the center of the filter cylinder 21. The fixing sleeve 536 is located outside the central shaft 51, so that the central shaft 51 is installed inside the fixing sleeve 536. One end of the fixing sleeve 536 is fixedly connected to the fixing frame 4. A mud receiving plate 6 is provided inside the filter cylinder 21. In this embodiment, the mud receiving plate 6 is configured as a V-shaped groove. The mud receiving plate 6 is arranged parallel to the axis of the filter cylinder 21, and the mud receiving plate 6 is located above the fixing sleeve 536. The distance between the mud receiving plate 6 and the fixing sleeve 536 is less than the radius of the toothed ring 535. The mud receiving plate 6 is fixedly connected to the fixing sleeve 536 by a fixing rod 61, and the V-shaped opening of the mud receiving plate 6 faces upward. The mud receiving plate 6 is used to collect debris falling from the highest point of the filter cylinder 21.

[0056] refer to Figure 4 and Figure 6To detach debris from the inner wall of the filter cylinder 21 at its highest point, a mud-pushing assembly 7 is provided at one end of the extrusion roller 22. The mud-pushing assembly 7 includes an arc-shaped rack 71 and a connecting gear 72. The arc-shaped rack 71 is fixed on an annular plate 23 fixedly connected to the fixing frame 4, and the arc-shaped rack 71 is located at the highest point of the filter cylinder 21. The connecting gear 72 is coaxially fixed on the extrusion roller 22. When the extrusion roller 22 revolves around the central axis 51 to the highest point of the filter cylinder 21, the connecting gear 72 meshes with the arc-shaped rack 71. At this time, the elastic telescopic arm 52 has a large extrusion force that can maintain the connection between the connecting gear 72 and the arc-shaped rack 71. Because the connecting gear 72 is restricted by the arc-shaped rack 71, the linear velocity of the outer wall of the extrusion roller 22 is not equal to the linear velocity of the inner wall of the filter cylinder 21. As a result, the extrusion roller 22 has a pushing effect on the debris on the inner wall of the filter cylinder 21, causing the debris to move along the inner wall of the filter cylinder 21 and detach from the inner wall of the filter cylinder 21 under the action of gravity, and then fall into the mud receiving plate 6.

[0057] refer to Figure 3 and Figure 7 A pusher plate 8 is provided at one end of the mud receiving plate 6. The pusher plate 8 is connected to a cylinder. The cylinder is fixed to the outside of the treatment tank 1, and the moving end of the cylinder extends into the treatment tank 1 and is fixedly connected to the pusher plate 8. Under the action of the cylinder, the pusher plate 8 moves from one end of the mud receiving plate 6 to the other end to push out the debris on the mud receiving plate 6. At the same time, a scraper 222 is provided on one side of the extrusion roller 22. A connecting rod 221 is provided between the two elastic telescopic arms 52. The two ends of the connecting rod 221 are respectively fixed to the two elastic telescopic arms 52. The connecting rod 221 allows the two elastic telescopic arms 52 to rotate simultaneously, making the position of the extrusion roller 22 more stable. At the same time, the scraper 222 is fixed to the side wall of the connecting rod 221, so that the scraper 222 abuts against the extrusion roller 22. When the extrusion roller 22 rotates, the scraper 222 can clean the debris adhering to the extrusion roller 22.

[0058] refer to Figure 6 and Figure 7Each elastic telescopic arm 52 has an adjusting component 9 at one end near the central shaft 51. The adjusting component 9 is used to adjust the position of the elastic telescopic arm 52 so that the extrusion roller 22 has different extrusion forces during rolling. The adjusting component 9 includes a cam disk 91, a guide sleeve 92, and a roller 93. The guide sleeve 92 of one adjusting component 9 is coaxially and fixedly connected to the central shaft 51, and the guide sleeve 92 of the other adjusting component 9 is rotatably connected to the fixed sleeve 536. The guide sleeve 92 is arranged parallel to the elastic telescopic arm 52, so that one end of the elastic telescopic arm 52 slides within the guide sleeve 92. At the same time, the roller 93 is installed on the side wall of the end of the elastic telescopic arm 52 that is inserted into the guide sleeve 92. The roller 93 is located outside the guide sleeve 92. In order to make the roller 93 outside the guide sleeve 92 and connected to the elastic telescopic arm 52, a clearance groove 94 is provided on the side wall of the guide sleeve 92. The cam disk 91 is coaxially fixed with the fixed sleeve 536. The cam disk 91 has a cam groove 95 for mounting the roller 93. When the roller 93 rolls along the cam groove 95, the distance between the elastic telescopic arm 52 and the center line of the central shaft 51 can be adjusted, thereby adjusting the distance between the squeeze roller 22 and the inner wall of the filter cylinder 21. In this embodiment, the cam groove 95 is arc-shaped at the top of the cam disk 91 so that the arc-shaped rack 71 and the connecting gear 72 mesh. From the bottom to the top of the cam disk 91 along the rolling direction of the roller 93, the distance of the cam groove 95 from the center gradually increases, so that the squeeze roller 22 can gradually squeeze the sewage in the impurities.

[0059] refer to Figure 8 At least one sewage inlet 211 is provided on the peripheral wall of the filter cartridge 21. A cover 212 is provided at the sewage inlet 211. The edge of the cover 212 is rotatably connected to the outer wall of the filter cartridge 21 via a hinge. A reset element, which is a torsion spring, is provided at the hinge. The force of the torsion spring is used to drive the cover 212 from the inside of the filter cartridge 21 towards the outer wall of the filter cartridge 21. An opening cylinder 2121 is provided at the position of the sewage inlet 13. The end of the opening cylinder 2121 extends into the treatment tank 1. When the cover 212 rotates with the filter cartridge 21 to the position of the opening cylinder 2121, the opening cylinder 2121 extends and abuts against the cover 212, causing the cover 212 to open into the filter cartridge 21. After opening, the sewage inlet 211 corresponds exactly to the sewage inlet 13, allowing sewage to enter the interior of the filter cartridge 21 through the sewage inlet 13 and the sewage inlet 211. Then, the cylinder 2121 is opened to retract, so that the cover 212 is automatically reset and the sewage inlet 211 is closed under the action of the reset component.

[0060] refer to Figure 9The debris collection assembly 3 includes a housing 31, a receiving plate 32, and a screw conveyor 33. The housing 31 is located inside the treatment tank 1, with an opening at the top. The housing 31 is positioned at the sludge outlet end of the sludge receiving plate 6. The screw conveyor 33 is connected to the housing 31 and is located at the bottom of the housing 31. The screw conveyor 33 is used to discharge the sludge from the housing 31. The end of the screw conveyor 33 away from the housing 31 extends horizontally out of the treatment tank 1, and a control valve 34 is installed at the outlet of the screw conveyor 33. When discharging sludge, the control valve 34 opens, and the screw conveyor 33 then discharges the sludge from the housing 31. The receiving plate 32 is horizontally slidable and connected to a cylinder. The cylinder moves one end of the receiving plate 32 closer to the sludge receiving plate 6, allowing the sludge to be pushed from the sludge receiving plate 6 onto the receiving plate 32 before entering the housing 31.

[0061] The working process of this embodiment is as follows: First, during the rotation of the filter cylinder 21, when the inlet 211 is in the position corresponding to the sewage inlet 13, the solenoid valve opens. At this time, under the negative pressure in the treatment tank 1, sewage is sucked into the filter cylinder 21, and then the inlet 211 is closed. The filter cylinder 21 continues to rotate, and at the same time, the dirt in the filter cylinder 21 is filtered through the filter cylinder 21. The impurities are left on the inner wall of the filter cylinder 21. Meanwhile, the squeezing roller 22 rotates along the inner wall of the filter cylinder 21, so that the squeezing roller 22 further squeezes the impurities, further reducing the water content in the impurities. The sludge sheet formed by the squeezing adheres to the inner wall of the filter cylinder 21. As the filter cylinder 21 reaches the highest point, the squeezing roller 22 is no longer at the same rotational linear speed as the filter cylinder 21 due to the action of the connecting gear 72 and the arc rack 71. Therefore, the squeezing roller 22 will push the sludge to move on the inner wall of the filter cylinder 21. At this time, the sludge will fall onto the sludge receiving plate 6 under the action of gravity. When the debris on the receiving plate 6 accumulates to a certain amount, the drive assembly stops driving the filter cartridge 21 and the squeezing roller 22. Then, the receiving plate 32 moves horizontally towards the receiving plate 6, connecting with the end of the receiving plate 6 furthest from the pushing plate 8. The pushing plate 8, under the action of a cylinder, moves from one end of the receiving plate 6 to the other, allowing the sludge to reach the receiving plate 32 and then fall into the housing 31 for temporary storage. Finally, the screw conveyor 33 can be opened and the control valve 34 opened to discharge the sludge from the housing 31 into the treatment tank 1 for further processing. The wastewater filtered by the filter cartridge 21 is discharged from the drain pipe 12 at the bottom of the treatment tank 1 for the next stage of treatment.

[0062] This application also discloses a negative pressure wastewater treatment process, which includes using the aforementioned negative pressure wastewater treatment device to first filter impurities with a particle size of 0.2 to 1 mm in the wastewater. Specifically, under the action of negative pressure in the treatment tank 1, the wastewater is drawn into a rotating filter cylinder 21, allowing the wastewater to pass through the peripheral wall of the filter cylinder 21, while the impurities are trapped on the inner wall of the filter cylinder 21. A squeezing roller 22 installed inside the filter cylinder 21 rolls along the inner wall of the filter cylinder 21, continuously squeezing and dewatering the impurities attached to the inner wall. At the highest point of the rotation path of the filter cylinder 21, the squeezed and dewatered impurities are peeled off from the inner wall of the filter cylinder 21. The peeled impurities are collected and discharged, and the wastewater in the impurities is squeezed out.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A negative pressure sewage treatment device, comprising a treatment tank, a negative pressure connecting pipe for connecting a negative pressure pump is arranged at the top of the treatment tank, and a sewage inlet is further connected to the treatment tank; characterized in that, Also comprising: a dirt separation assembly and a dirt collection assembly arranged in the processing tank; the dirt separation assembly comprises: a filter cartridge rotatably arranged in the processing tank by a fixed frame fixedly arranged in the processing tank; a squeezing roller arranged in the filter cartridge and used for rolling along the inner wall of the filter cartridge to squeeze the dirt attached to the inner wall of the filter cartridge; a driving assembly connected with the filter cartridge and the squeezing roller, used for driving the filter cartridge to rotate and driving the squeezing roller to roll along the inner wall of the filter cartridge; a mud receiving plate arranged inside the filter cartridge and used for receiving the squeezed dirt falling from the highest part of the filter cartridge; the dirt collection assembly is arranged at one end of the mud receiving plate and used for collecting the dirt on the mud receiving plate; the driving assembly comprises: one end of a central shaft extending out of the processing tank and connected with a driving motor, and the other end of the central shaft coaxial with the filter cartridge and inserted into the filter cartridge; an elastic telescopic arm arranged in the filter cartridge along the radial direction of the filter cartridge, one end of the elastic telescopic arm connected with the central shaft, and the other end of the elastic telescopic arm rotatably arranged with the squeezing roller; and the rotating speed of the central shaft is greater than the rotating speed of the filter cartridge; the driving assembly further comprises a mud pushing assembly arranged at the highest point of the rotating path of the filter cartridge; when the squeezing roller revolves with the central shaft to the highest point of the filter cartridge, the mud pushing assembly is used for limiting the rotation of the squeezing roller, so that the squeezing roller pushes the squeezed dirt on the inner wall of the filter cartridge and makes the dirt fall off; the mud pushing assembly comprises an arc-shaped rack fixed on the fixed frame, and a connecting gear coaxially fixed with the squeezing roller; when the squeezing roller moves to the highest point of the filter cartridge, the connecting gear is engaged with the arc-shaped rack; an adjusting assembly used for adjusting the position of the elastic telescopic arm to change the squeezing force of the squeezing roller on the inner wall of the filter cartridge during rolling; a fixed sleeve fixedly arranged on the fixed frame and sleeved on the outside of the central shaft, the fixed sleeve being arranged inside the filter cartridge; the adjusting assembly comprises a cam disc fixedly connected with the fixed sleeve, a guide sleeve connected with the central shaft, and one end of the elastic telescopic arm slidingly fitted in the guide sleeve; and a roller arranged on the elastic telescopic arm, a cam groove being formed in the cam disc, and the roller rolling in the cam groove.

2. The negative pressure sewage treatment device according to claim 1, characterized in that, The driving assembly is used for driving the revolving angular velocity of the squeezing roller to be greater than the rotating angular velocity of the filter cartridge, and the revolving direction of the squeezing roller is the same as the rotating direction of the filter cartridge.

3. A negative pressure sewage treatment device according to claim 2, wherein The driving assembly further comprises: a planetary gear set connected with the central shaft and the filter cartridge, used for driving the filter cartridge to rotate at a speed lower than the rotating speed of the central shaft in the same direction when the central shaft rotates.

4. A negative pressure sewage treatment device according to claim 3, wherein One side wall of the elastic telescopic arm arranged with the squeezing roller is fixedly arranged with a connecting rod, the connecting rod is fixedly arranged with a scraper, the scraper abuts against the side wall of the squeezing roller, and the scraper is used for cleaning the dirt on the circumferential wall of the squeezing roller.

5. The negative pressure sewage treatment device according to claim 1, characterized in that, The mud receiving plate is provided with a mud pushing plate at the end away from the dirt collection assembly, the mud pushing plate is connected with an air cylinder, the dirt collection assembly comprises a box body and a receiving plate horizontally slidingly arranged, and the bottom of the box body is provided with a screw conveyor extending to the outside of the box body, the screw conveyor is used for conveying the dirt in the box body to the outside of the processing tank.

6. The negative pressure sewage treatment device according to claim 1, characterized in that, At least one sewage inlet is formed on the peripheral wall of the filter cartridge, and a cover is arranged at the sewage inlet. An opening cylinder is arranged at a position where the sewage inlet of the treatment tank is arranged, and the opening cylinder opens the cover to the inside of the filter cartridge. The cover is rotationally connected to the sewage inlet and is reset to close the sewage inlet by a reset member arranged on the cover.

7. A negative pressure sewage treatment process, using the negative pressure sewage treatment device of any one of claims 1-6 to treat sundries in sewage, characterized in that, The method comprises the following steps: Under the action of negative pressure in the treatment tank, sewage is sucked into a rotating filter cartridge, and the sewage is filtered through the peripheral wall of the filter cartridge, and impurities are intercepted on the inner wall of the filter cartridge; An extrusion roller arranged in the filter cartridge rolls along the inner wall of the filter cartridge to continuously extrude and dewater the impurities attached to the inner wall; The extruded and dewatered impurities are stripped from the inner wall of the filter cartridge at the highest point of the rotating path of the filter cartridge; The stripped impurities are collected and discharged.

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