A press dewatering device for phosphorus-containing sludge treatment

Abstract

The present application relates to sludge squeezing dewatering technical field, specifically to a kind of for phosphorus-containing sludge treatment's squeezing dewatering device, including rotatable rotary drum and rotatable installation in rotary drum inside screw conveyor, screw conveyor can be helical pushing motion relative to the rotation of rotary drum, the squeezing dewatering device for phosphorus-containing sludge treatment, by reducing the way of cylinder rotation speed, can extend the residence time of sludge in rotary drum cylindrical section, so that the sludge in cylindrical section rotary drum can be centrifuged for a longer period of time, without reducing water intake, also no need to replace rotary drum, can effectively improve dewatering effect.If it is the case of reducing the speed of cylinder, still produce thin mud, for this, it needs to be blocked ring cover part to be discharged from the outlet 1, reduce water intake, and the cover process can be superimposed with reducing speed, further improve dewatering effect.And cover process is simple and rapid, and with the same structure as speed regulation mechanism, will not increase the cost of equipment.

Description

Technical Field

[0001] This invention relates to the field of sludge pressing and dewatering technology, and more specifically to a pressing and dewatering device for treating phosphorus-containing sludge. Background Technology

[0002] Phosphorus-containing sludge (also known as phosphorus-rich sludge) is a solid waste with a significantly higher phosphorus content than ordinary sludge, produced during wastewater treatment processes due to biological or chemical phosphorus removal. It is one of the main byproducts of urban wastewater treatment plants.

[0003] To treat phosphorus-containing sludge, it needs to be dewatered before subsequent recycling. However, the moisture content of each batch of sludge varies, resulting in dewatered sludge that is still quite wet when the moisture content is high. This wet sludge cannot be fed back into the horizontal centrifugal dewatering machine. To improve dewatering efficiency, existing technologies use an extended cylindrical section of the drum, allowing the sludge to undergo centrifugal pushing for a longer period. However, this method requires changing the length of the drum, which can only be determined during product design and cannot be changed during production.

[0004] Therefore, existing technologies also include adjusting the transmission ratio. By making the transmission ratio of the drum and the screw conveyor close, the speed at which the sludge is transported is slowed down. This method requires reducing the water inlet speed, which leads to a decrease in the working efficiency of the equipment.

[0005] Therefore, it is necessary to design a pressing and dewatering device for treating phosphorus-containing sludge that can extend the residence time of sludge in the cylindrical section of the drum without reducing the water intake or replacing the drum, and can still effectively improve the dewatering effect when the sludge has a high water content. Summary of the Invention

[0006] To address the aforementioned technical shortcomings, the present invention aims to provide a pressing and dewatering device for treating phosphorus-containing sludge, which can extend the residence time of sludge in the cylindrical section of the drum without reducing the water intake or replacing the drum, and can still effectively improve the dewatering effect when the sludge has a high water content.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides a pressing and dewatering device for treating phosphorus-containing sludge, comprising a rotatable drum and a rotatable screw conveyor installed inside the drum. The screw conveyor is capable of performing a screw-driven motion relative to the rotation of the drum. The screw conveyor includes a rotatable cylindrical body and a conical cylindrical body, with one end of the cylindrical body and the conical cylindrical body in contact. The conical cylindrical body is connected to the cylindrical body via a feeding pipe. The rotation of the conical cylindrical body drives the feeding pipe to rotate, and the feeding pipe then drives the cylindrical body to enter the drum. The drum rotates, and a rotating tube is provided on the conical cylinder that extends through the side wall of the drum. The rotating tube is connected to the feeding tube through a transmission mechanism. The transmission mechanism is used to transmit the power of the rotating tube to the feeding tube. The transmission mechanism is also connected to a transmission switching mechanism, which is used to change the transmission ratio of the transmission mechanism. The feeding tube is inserted into the middle of the cylinder and is slidably connected to the middle of the cylinder. A first sewage outlet is provided in the middle of the feeding tube. The first sewage outlet is located in the hollow cavity of the conical cylinder. A second sewage outlet is provided on the conical cylinder and communicates with the hollow cavity.

[0008] Preferably, the transmission mechanism includes a transmission gear set, a locking seat, and a driven gear. The transmission gear set includes a driving gear and a large gear and a small gear connected coaxially. The driving gear is fixedly installed on the rotating tube and meshes with the large gear. The locking seat is installed on the feeding tube, and the rotating tube has a locking groove for the locking seat to engage. The driven gear is fixedly installed on the feeding tube. The transmission switching mechanism includes a linear push plate that can move horizontally. The linear push plate is connected to the feeding tube, and an elastic mechanism is provided in the axial direction of the linear push plate and the feeding tube.

[0009] Preferably, the feeding pipe includes a sliding column installed at its tail end, with a plurality of protrusions on the outer edge of the sliding column, and a support sliding ring fixedly installed on the inner edge of the cylinder, with a groove on the inner edge of the support sliding ring for the protrusions to slide into.

[0010] Preferably, a retaining ring is fixedly installed inside the conical cylinder. The retaining ring is fixedly connected to the inner wall of the conical cylinder through a conical ring. The retaining ring and the conical ring have a clearance hole for the sludge fluid to flow through. An extension gear is fixedly installed at the tail of the driven gear. When the two sides of the driven gear are coplanar, the retaining ring fits against one side of the outlet. When the extension gear meshes with the pinion, the retaining ring covers the end area of ​​the outlet.

[0011] Preferably, the elastic mechanism includes a spring and a retaining ring 2 fixedly installed on the outer edge of the feed tube. One end of the spring contacts the flange step on the feed tube, and the other end of the spring contacts the linear push plate.

[0012] Preferably, a plurality of protrusions are fixedly provided on the feeding tube, and a groove is provided on the inner edge of the snap-fit ​​seat to slide and snap with the protrusions. A limiting ring is fixedly provided on the feeding tube to contact the end of the snap-fit ​​seat. A buffer spring is provided between the snap-fit ​​seat and the extension gear. The buffer spring is used to apply an elastic force away from the extension gear to the snap-fit ​​seat.

[0013] Preferably, a protruding strip is fixedly provided on the outer edge of the snap-fit ​​seat, and the snap-fit ​​groove includes a recess that snaps into the protruding strip.

[0014] Preferably, multiple support bars are provided between the retaining ring and the conical ring.

[0015] Preferably, the transmission switching mechanism includes an electric push rod, the output end of which is fixedly connected to a linear push plate.

[0016] The beneficial effects of this invention are as follows: This pressing and dewatering device for treating phosphorus-containing sludge can extend the residence time of sludge in the cylindrical section of the drum by reducing the rotation speed of the drum. This allows the sludge in the cylindrical section of the drum to undergo centrifugation for a longer period of time, without reducing the water intake or replacing the drum, thus effectively improving the dewatering effect. However, even when the drum speed is reduced, thin sludge may still be produced. Therefore, a baffle ring is needed to cover part of the sludge outlet to reduce the water intake. This covering process can be combined with the speed reduction to further improve the dewatering effect. Moreover, the covering process is simple and quick, and it uses the same structure as the speed adjustment mechanism, so it does not increase the cost of the equipment. Attached Figure Description

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

[0018] Figure 1 This is the front view of the present invention.

[0019] Figure 2 for Figure 1 A cross-sectional view along line AA.

[0020] Figure 3 for Figure 2 A magnified view of section B.

[0021] Figure 4 for Figure 2 A magnified view of a portion of point C.

[0022] Figure 5 for Figure 2 A magnified view of a portion of point D.

[0023] Figure 6 This is an exploded view of the connector and the rotating tube.

[0024] Figure 7 This is an exploded view of the sliding column and the supporting slip ring.

[0025] Figure 8 This is a front view of the driven gear and pinion in meshing.

[0026] Figure 9 This is the front view of the retaining ring.

[0027] Explanation of reference numerals in the attached diagram: 1. Drum; 1a. Cylindrical section drum; 1b. Conical section drum; 2. Feed pipe; 2a. Outlet 1; 2b. Sliding column; 2c. Raised strip 1; 2d. Supporting slip ring; 2e. Groove 1; 2f. Raised strip 2; 2h. Limiting ring; 3. Screw conveyor; 3a. Cylinder; 3c. Screw blade; 3d. Conical screw blade; 3e. Conical cylinder; 3e1. Outlet 2; 3e2. Rotary pipe; 3e3. Pulley; 3e4. 3. Snap-fit ​​groove; 3e5. Retaining ring one; 3e6. Clearance hole; 3e7. Support bar; 4. Transmission mechanism; 4a. Transmission gear set; 4a1. Large gear; 4a2. Small gear; 4a3. Driving gear; 4b. Snap-fit ​​seat; 4b1. Groove two; 4b2. Raised bar three; 4c. Driven gear; 4d. Extension gear; 5. Transmission switching mechanism; 5a. Linear push plate; 5b. Electric push rod; 6. Elastic mechanism; 6a. Retaining ring two; 6b. Spring. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example: This invention provides a pressing and dewatering device for treating phosphorus-containing sludge, such as... Figure 1-9As shown, the pressing and dewatering device for treating phosphorus-containing sludge has a main structure of a horizontal centrifuge. It is characterized by including a rotatable drum 1 and a rotatable screw conveyor 3 installed inside the drum 1. The screw conveyor 3 can perform a screw-driven motion relative to the rotation of the drum 1. The screw conveyor 3 includes a rotatable cylindrical body 3a and a conical cylindrical body 3e. One end of the cylindrical body 3a and the conical cylindrical body 3e are in contact but not fixedly connected. The conical cylindrical body 3e is connected to the cylindrical body 3a via a feeding pipe 2. The rotation of the conical cylindrical body 3e drives the feeding pipe 2 to rotate, which in turn drives the cylindrical body 3a to rotate. A rotating pipe 3e2 is provided on the conical cylindrical body 3e, extending through the side wall of the drum 1. The rotating pipe 3e2 is connected to the drum 1 via a screw conveyor... The drive mechanism 4 is connected to the feeding pipe 2. The drive mechanism 4 is used to transmit the power of the rotating pipe 3e2 to the feeding pipe 2. The drive mechanism 4 is also connected to the drive switching mechanism 5, which is used to change the transmission ratio of the drive mechanism 4. The feeding pipe 2 is inserted into the middle of the cylinder 3a and is slidably connected to the middle of the cylinder 3a. The slidable connection means that the feeding pipe 2 can slide relative to the cylinder 3a. When the feeding pipe 2 rotates, it can drive the cylinder 3a to rotate together. The middle of the feeding pipe 2 is provided with a first sewage outlet 2a, which is located in the hollow cavity of the conical cylinder 3e. The conical cylinder 3e is provided with a second sewage outlet 3e1, which is connected to the hollow cavity. The rotating drum 1 includes a cylindrical section drum 1a and a conical section drum 1b. A pulley 3e3 is connected to the outside of the rotating pipe 3e2. The pulley 3e3 is driven to rotate by a motor and a belt. When pulley 3e3 rotates, it drives rotating tube 3e2 to rotate, which in turn rotates with the integrally formed conical cylinder 3e. When no sludge is discharged, the rotational speed of the feed pipe 2 driven by the transmission mechanism 4 is the same as the rotational speed of pulley 3e3, meaning the conical cylinder 3e and the cylinder 3a rotate at the same speed. However, once sludge discharge occurs, the sludge needs to remain in the cylindrical drum 1a for a longer period, meaning the feed pipe 2 needs to be in a decelerated state relative to the rotating tube 3e2. This is achieved through a transmission switching mechanism 5, which reduces the transmission ratio of the transmission mechanism 4 and slows down the feed pipe 2. This ensures that the sludge on the inner wall of the cylindrical drum 1a takes longer to reach the conical drum 1b, increasing the sludge's retention time inside the cylindrical drum 1a, thus increasing the centrifugation time and extending the length of the cylindrical drum 1a compared to existing technologies. The outer edge of the cylinder 3a is provided with a spiral blade 3c, and the outer edge of the conical cylinder 3e is provided with a conical spiral blade 3d. The spiral blade 3c and the conical spiral blade 3d drive the sludge on the inner wall of the drum 1 to move.

[0030] The sewage discharged from outlet 2a will flow along Figure 4 The flow proceeds in the direction of the arrow shown, eventually exiting through the outlet 3e1 and entering the interior of the drum 1.

[0031] To ensure that the speed of the feeding pipe 2 decreases after switching, the transmission mechanism 4 includes a transmission gear set 4a, a locking seat 4b, and a driven gear 4c. The transmission gear set 4a includes a driving gear 4a3 and a large gear 4a1 and a small gear 4a2 coaxially connected. The driving gear 4a3 is fixedly mounted on the rotating pipe 3e2 and meshes with the large gear 4a1. The locking seat 4b is mounted on the feeding pipe 2, and the rotating pipe 3e2 has a locking groove 3e4 for the locking seat 4b to engage. The driven gear 4c is fixedly mounted on the feeding pipe 2. The transmission switching mechanism 5 includes a horizontally movable linear push plate 5a connected to the feeding pipe 2, and an elastic mechanism 6 is provided in the axial direction of the linear push plate 5a and the feeding pipe 2. When no sludge is generated, the rotating pipe 3e2 will drive the feeding pipe 2 to rotate at the same speed through the connection of the locking seat 4b, so that the cylindrical section drum 1a and the conical section drum 1b rotate at the same speed. When sludge is generated, the linear push plate 5a pulls the feed pipe 2 horizontally, causing the clamping seat 4b to be pulled out from the rotating pipe 3e2. Simultaneously, the feed pipe 2 drives the driven gear 4c to move horizontally, eventually meshing with the small gear 4a2. At this point, the rotational power of the rotating pipe 3e2 is transferred through the driving gear 4a3, the large gear 4a1, and the small gear 4a2, ultimately transmitting to the driven gear 4c. This causes the driven gear 4c to rotate the feed pipe 2. However, because the gear profile of the large gear 4a1 is larger than that of the small gear 4a2, the rotational speed of the feed pipe 2 decreases during transmission. This allows the speed of the feed pipe 2 to decrease after switching, increasing the retention time of the sludge inside the cylindrical drum 1a.

[0032] To ensure that the feeding pipe 2 can still drive the cylinder 3a to rotate before and after the switching, the feeding pipe 2 includes a sliding column 2b installed at its tail. Multiple protrusions 2c are provided on the outer edge of the sliding column 2b, and a support slip ring 2d is fixedly installed on the inner edge of the cylinder 3a. The inner edge of the support slip ring 2d has a groove 2e for the protrusions 2c to slide into. When the sliding column 2b rotates, it drives the support slip ring 2d to rotate through the protrusions 2c and the groove 2e, causing the groove 2e to drive the connected cylinder 3a to rotate. Furthermore, during the linear sliding of the sliding column 2b, the protrusions 2c remain within the groove 2e.

[0033] To further prevent the formation of sludge, a retaining ring 3e5 is fixedly installed inside the conical cylinder 3e. The retaining ring 3e5 is fixedly connected to the inner wall of the conical cylinder 3e via a conical ring. An obstacle hole 3e6 is provided between the retaining ring 3e5 and the conical ring to allow the sludge fluid to flow through. An extension gear 4d is fixedly installed at the tail of the driven gear 4c. Figure 8As shown, when the two sides of the driven gear 4c are coplanar, the retaining ring 3e5 fits against one side of the outlet 2a. When the extending gear 4d meshes with the pinion 4a2, the retaining ring 3e5 covers the end area of ​​the outlet 2a. If sludge is still generated when the driven gear 4c meshes with the pinion 4a2, the transmission switching mechanism 5 needs to continue to push forward, so that the extending gear 4d meshes with the pinion 4a2. As it moves forward, the retaining ring 3e5 will gradually cover the end of the outlet 2a, thus reducing the size of the outlet 2a and reducing the water inflow. By reducing the water inflow, and with the sludge remaining in the cylindrical drum 1a for a longer time, the generation of sludge is further avoided.

[0034] The elastic mechanism 6 includes a spring 6b and a retaining ring 6a fixedly mounted on the outer edge of the feed tube 2. One end of the spring 6b contacts the flange step on the feed tube 2, and the other end of the spring 6b contacts the linear push plate 5a. During the pushing process of the linear push plate 5a, there is a brief contact between the driven gear 4c and the pinion 4a2 due to their engagement. Therefore, the action of the spring 6b avoids rigid contact, allowing time for the gears of 4a and 4a2 to engage.

[0035] If the snap-fit ​​seat 4b is fixedly installed on the feed pipe 2, a rigid collision will also occur during the process of the linear push plate 5a pushing the snap-fit ​​seat 4b in the opposite direction to snap it into the snap-fit ​​groove 3e4. Therefore, multiple protrusions 2f are fixedly provided on the feed pipe 2, and a groove 4b1 is provided on the inner edge of the snap-fit ​​seat 4b to slide and snap into the protrusions 2f. A limiting ring 2h is fixedly provided on the feed pipe 2 to contact the end of the snap-fit ​​seat 4b. A buffer spring 4e is provided between the snap-fit ​​seat 4b and the extension gear 4d. The buffer spring 4e is used to apply an elastic force to the snap-fit ​​seat 4b away from the extension gear 4d. During the insertion of the snap-fit ​​seat 4b into the snap-fit ​​groove 3e4, if rigid contact occurs, it will abut against the snap-fit ​​seat 4b, causing the buffer spring 4e to be compressed. When the rotating pipe 3e2 rotates, the feed pipe 2 will rotate together through the connection between the protrusions 2f and the groove 4b1.

[0036] A protruding strip 4b2 is fixedly provided on the outer edge of the snap-fit ​​seat 4b, and the snap-fit ​​groove 3e4 includes a groove 3 that snaps into the protruding strip 4b2. Through the action of the protruding strip 4b2, when the conical cylinder 3e rotates, the protruding strip 4b2 can drive the snap-fit ​​seat 4b to rotate, thereby driving the feeding pipe 2 to rotate.

[0037] Multiple support bars 3e7 are provided between the retaining ring 3e5 and the conical ring. Through the connection and support of the multiple support bars 3e7, the clearance hole 3e6 is thus created.

[0038] The transmission switching mechanism 5 includes an electric push rod 5b, the output end of which is fixedly connected to a linear push plate 5a. By controlling the movement of the output end of the electric push rod 5b, the linear movement of the linear push plate 5a is achieved.

[0039] In use, when no sludge is present, the locking seat 4b engages with the conical cylinder 3e. When the conical cylinder 3e rotates, it drives the feeding pipe 2 to rotate simultaneously, causing the cylinder 3a and the conical cylinder 3e to rotate at the same speed. However, when sludge is present, the transmission switching mechanism 5 switches gears, engaging the driven gear 4c with the pinion 4a2, disengaging the locking seat 4b from the conical cylinder 3e. This allows the speed of the conical cylinder 3e to be transmitted through the transmission gear set 4a, reducing the rotational speed of the feeding pipe 2. In other words, the rotational speed of the cylinder 3a becomes slower relative to the conical cylinder 3e. If sludge is still produced after the transmission switching mechanism 5 switches, it continues to push, causing the retaining ring 3e5 to partially cover the sewage outlet 2a, thus reducing the outflow.

[0040] This dewatering device for treating phosphorus-containing sludge extends the residence time of sludge in the cylindrical section of the drum by reducing the rotation speed of the drum body 3a. This allows the sludge in the cylindrical drum 1a to undergo a longer centrifugation period without reducing the influent flow or replacing the drum, effectively improving the dewatering effect. However, even with reduced drum body 3a rotation speed, some sludge may still be produced. Therefore, a baffle ring 3e5 is needed to cover part of the sludge outlet 2a to reduce the influent flow. This covering process can be combined with the speed reduction to further improve the dewatering effect. Furthermore, the covering process is simple and quick, and uses the same structure as the speed adjustment mechanism, without increasing the equipment cost.

[0041] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A pressing and dewatering device for treating phosphorus-containing sludge, characterized in that, The device includes a rotatable drum (1) and a rotatable screw conveyor (3) installed inside the drum (1). The screw conveyor (3) can perform a screw-driven motion relative to the rotation of the drum (1). The screw conveyor (3) includes a rotatable cylinder (3a) and a conical cylinder (3e). One end of the cylinder (3a) and the conical cylinder (3e) are in contact. The conical cylinder (3e) is connected to the cylinder (3a) via a feeding pipe (2). The rotation of the conical cylinder (3e) can drive the feeding pipe (2) to rotate, and the feeding pipe (2) then drives the cylinder (3a) to rotate. A rotating pipe (3e2) is provided on the conical cylinder (3e) that extends through the side wall of the drum (1). 3e2) is connected to the feeding pipe (2) via the transmission mechanism (4). The transmission mechanism (4) is used to transmit the power of the rotating pipe (3e2) to the feeding pipe (2). The transmission mechanism (4) is also connected to the transmission switching mechanism (5). The transmission switching mechanism (5) is used to change the transmission ratio of the transmission mechanism (4). The feeding pipe (2) is inserted into the middle of the cylinder (3a) and the feeding pipe (2) is slidably connected to the middle of the cylinder (3a). The middle of the feeding pipe (2) is provided with a sewage outlet one (2a). The sewage outlet one (2a) is located in the hollow cavity of the conical cylinder (3e). The conical cylinder (3e) is provided with a sewage outlet two (3e1). The sewage outlet two (3e1) is connected to the hollow cavity. The transmission mechanism (4) includes a transmission gear set (4a), a locking seat (4b), and a driven gear (4c). The transmission gear set (4a) includes a driving gear (4a3) and a large gear (4a1) and a small gear (4a2) connected coaxially. The driving gear (4a3) is fixedly installed on the rotating tube (3e2). The driving gear (4a3) meshes with the large gear (4a1). The locking seat (4b) is installed on the feeding tube (2). The rotating tube (3e2) has a locking groove (3e4) for the locking seat (4b) to be inserted into. The driven gear (4c) is fixedly installed on the feeding tube (2). The transmission switching mechanism (5) includes a linear push plate (5a) that can move horizontally. The linear push plate (5a) is connected to the feeding tube (2), and an elastic mechanism (6) is provided in the axial direction of the linear push plate (5a) and the feeding tube (2). A retaining ring 1 (3e5) is fixedly installed inside the conical cylinder (3e). The retaining ring 1 (3e5) is fixedly connected to the inner wall of the conical cylinder (3e) through the conical ring. The retaining ring 1 (3e5) and the conical ring have a clearance hole (3e6) for the sludge fluid to flow through. An extension gear (4d) is fixedly installed at the tail of the driven gear (4c). When the two sides of the driven gear (4c) are coplanar with the two sides of the driven gear (4c), the retaining ring 1 (3e5) fits against one side of the sewage outlet 1 (2a). When the extension gear (4d) meshes with the pinion (4a2), the retaining ring 1 (3e5) covers the end area of ​​the sewage outlet 1 (2a).

2. The pressing and dewatering device for treating phosphorus-containing sludge as described in claim 1, characterized in that, The feeding tube (2) includes a sliding column (2b) installed at its tail. Multiple protrusions (2c) are provided on the outer edge of the sliding column (2b). A support slip ring (2d) is fixedly provided on the inner edge of the cylinder (3a). A groove (2e) is provided on the inner edge of the support slip ring (2d) for the protrusions (2c) to slide into.

3. The pressing and dewatering device for treating phosphorus-containing sludge as described in claim 1, characterized in that, The elastic mechanism (6) includes a spring (6b) and a retaining ring (6a) fixedly installed on the outer edge of the feed tube (2). One end of the spring (6b) contacts the flange step on the feed tube (2), and the other end of the spring (6b) contacts the linear push plate (5a).

4. The pressing and dewatering device for treating phosphorus-containing sludge as described in claim 1, characterized in that, Multiple protrusions (2f) are fixedly provided on the feeding tube (2). A groove (4b1) is provided on the inner edge of the snap-fit ​​seat (4b) to slide and snap with the protrusions (2f). A limiting ring (2h) is fixedly provided on the feeding tube (2) to contact the end of the snap-fit ​​seat (4b). A buffer spring (4e) is provided between the snap-fit ​​seat (4b) and the extension gear (4d). The buffer spring (4e) is used to apply an elastic force away from the extension gear (4d) to the snap-fit ​​seat (4b).

5. A pressing and dewatering device for treating phosphorus-containing sludge as described in claim 1, characterized in that, A protrusion three (4b2) is fixedly provided on the outer edge of the snap-fit ​​seat (4b), and the snap-fit ​​groove (3e4) includes a groove three that snaps into the protrusion three (4b2).

6. A pressing and dewatering device for treating phosphorus-containing sludge as described in claim 1, characterized in that, Multiple support bars (3e7) are provided between the retaining ring 1 (3e5) and the conical ring.

7. A pressing and dewatering device for treating phosphorus-containing sludge as described in claim 1, characterized in that, The transmission switching mechanism (5) includes an electric push rod (5b), the output end of which is fixedly connected to the linear push plate (5a).

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