A screw press for sewage discharge

Abstract

The application relates to a screw press for sewage discharge, which comprises a press box, a screw device arranged in the press box, a feeding pipe, a drainage tank and a residue discharging pipe communicated on the press box, a filter plate arranged in the drainage tank, an extrusion assembly arranged in the residue discharging pipe, the extrusion assembly comprising an extrusion ring slidingly connected to the inner side wall of the residue discharging pipe, the opposite sides of the extrusion ring being provided with moving blocks, the inner side wall of the residue discharging pipe being provided with moving grooves in sliding cooperation with the moving blocks, one of the moving grooves being rotationally connected with a moving screw rod, the moving blocks being threadedly connected to the moving screw rod, the residue discharging pipe being provided with a driving piece for driving the moving screw rod to rotate, and the bottom of the residue discharging pipe being provided with a connecting pipe communicated with the drainage tank. The application has the effect of improving the dewatering effect of the screw press.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a screw press for wastewater discharge. Background Technology

[0002] As an auxiliary device to the screen, the screw press plays a crucial role in the sewage treatment system. It is mainly used to press and dewater the screenings and other debris collected by the screen, reducing their weight and volume for easier transportation and disposal. Existing screw presses typically include a pressing chamber with a screw mechanism for material conveying and compression. A feed pipe is connected to the top of the pressing chamber, an upward-sloping discharge pipe is connected to the outlet, and a drain tank is connected to the bottom. The working process involves the screenings entering the pressing chamber through the feed pipe and being continuously squeezed and dewatered by the screw mechanism. The water squeezed out collects in the drain tank and is discharged through the drain pipe, while the compressed material is discharged through the discharge pipe, thus achieving the reduction of screenings volume.

[0003] However, in practical applications, it has been found that existing screw presses rely solely on the squeezing force of the screw plates inside the pressing box to dehydrate the material. This single squeezing method is difficult to completely remove the water that has seeped into the material, resulting in an overall dehydration effect that is not obvious and has significant shortcomings. Utility Model Content

[0004] In order to improve the dewatering effect of the screw press, this application provides a screw press for wastewater discharge.

[0005] The screw press for wastewater discharge provided in this application adopts the following technical solution: A screw press for wastewater discharge includes a pressing box containing a screw mechanism. The pressing box is connected to a feed pipe, a drain box, and a slag discharge pipe. A filter plate is installed in the drain box. An extrusion assembly is installed in the slag discharge pipe. The extrusion assembly includes an extrusion ring slidably connected to the inner wall of the slag discharge pipe. Movable blocks are located on opposite sides of the extrusion ring. A moving groove is formed on the inner wall of the slag discharge pipe, slidingly engaging with the moving blocks. A moving screw is rotatably connected to one of the moving grooves. The moving blocks are threaded onto the moving screw. A driving component is installed on the slag discharge pipe to drive the moving screw to rotate. A connecting pipe communicating with the drain box is located at the bottom of the slag discharge pipe.

[0006] By adopting the above technical solution, during dewatering, the material is fed into the pressing box through the feed pipe. The screw device performs a first-stage compression dewatering on the material. Subsequently, the compressed and dewatered material enters the slag discharge pipe. The driving component drives the moving screw to rotate. Under the guidance of the moving groove and the moving block, the moving screw drives the extrusion ring to move along the axis of the slag discharge pipe. During the movement, the material after the first compression is subjected to a second-stage compaction and extrusion, further squeezing out the water that has not been completely discharged from the material. The extruded water collects along the inner wall of the slag discharge pipe to the connecting pipe at the bottom, and flows into the drainage tank through the connecting pipe, where it is discharged together with the water dewatered by the first compression. In this way, the secondary compression of the material and the directional collection and discharge of water are achieved, improving the dewatering effect of the screw press.

[0007] Optionally, the inner wall of the extrusion ring is provided with a plurality of sliding grooves along the circumference, and a sliding rod is slidably connected inside each sliding groove. The end of the sliding rod extends out of the sliding groove and is provided with an extrusion arc plate. A limit block is provided on the outer surface of the sliding rod. A limit groove is provided on the inner wall of the sliding groove to slide with the limit block. The inner wall of the limit groove and the limit block are connected by a spring. In the natural state of the spring, the extrusion arc plate abuts against the inner wall of the extrusion ring. A pushing component is provided inside the slag discharge pipe. The pushing component intermittently overcomes the spring force to drive the limit block to move.

[0008] By adopting the above technical solution, during the movement of the extrusion ring along the inner wall of the slag discharge pipe, the pushing component intermittently overcomes the spring force to drive the limiting block to move toward the center of the slag discharge pipe. The limiting block drives the extrusion arc plate on the sliding rod to extend synchronously toward the center of the slag discharge pipe, forming radial extrusion on the material in the slag discharge pipe. When the pushing component releases the force on the limiting block, the spring pulls the limiting block back to its original position under its own elastic force, causing the extrusion arc plate to retract to the inner wall of the extrusion ring. In this way, the extrusion arc plate is intermittently extended and retracted during the movement of the extrusion ring. On the basis of the axial extrusion of the extrusion ring, the material is superimposed with a radial intermittent compaction effect, thereby further improving the dewatering effect of the screw press.

[0009] Optionally, the inner wall of the slag discharge pipe is provided with a pushing groove along the axial direction to slide with the sliding rod. The pushing assembly includes a first magnetic sheet disposed at the end of the sliding rod away from the extrusion arc plate. A plurality of second magnetic sheets are spaced apart along the length direction on the inner wall of the pushing groove. The second magnetic sheets and the first magnetic sheets are magnetically repelled, and the magnetic force is greater than the elastic force of the spring.

[0010] By adopting the above technical solution, when the extrusion ring moves, it drives the sliding rod to move in the pushing groove. When the first magnetic piece approaches the second magnetic piece, the magnetic repulsion force generated by the two is greater than the spring force, which in turn pushes the sliding rod to drive the extrusion arc plate to extend towards the center of the slag discharge pipe, forming radial compaction of the material in the pipe. When the extrusion ring continues to move and the first magnetic piece moves away from the second magnetic piece, the magnetic repulsion force disappears, and the spring pulls the limit block to reset under its own elastic force, driving the sliding rod and the extrusion arc plate to retract to the initial position. In this way, the extrusion arc plate can achieve intermittent radial expansion and contraction as the extrusion ring continues to move.

[0011] Optionally, the outer surface of the extrusion ring is provided with a connecting sleeve that slides with the sliding groove. The connecting sleeve is slidably sleeved on the outer periphery of the sliding rod. Corrugated covers are provided on the outer surfaces of the connecting sleeve and the moving block. The other end of the corrugated cover on the connecting sleeve is provided on the inner sidewall of the pushing groove, and the other end of the corrugated cover on the moving block is provided on the inner sidewall of the moving groove.

[0012] By adopting the above technical solution, as the extrusion ring moves, the corrugated covers on both sides of the connecting sleeve and the moving block are squeezed or stretched, and always cover the moving groove or pushing groove at the location. This reduces the probability of dirty materials entering the moving groove and pushing groove, reduces the influence of materials on the moving screw and the second magnetic plate, and thus ensures the stability of the axial movement of the extrusion ring and the radial extension and retraction of the extrusion arc plate.

[0013] Optionally, the outer surface of the extrusion ring is provided with a connecting sleeve that slides with the sliding groove. The connecting sleeve is slidably sleeved on the outer periphery of the sliding rod. Corrugated covers are provided on the outer surfaces of the connecting sleeve and the moving block. The other end of the corrugated cover on the connecting sleeve is provided on the inner sidewall of the pushing groove, and the other end of the corrugated cover on the moving block is provided on the inner sidewall of the moving groove.

[0014] By adopting the above technical solution, when the filter plate becomes clogged or damaged, the worker can remove the fixing function of the fixing component, and then pull out the mounting frame to move the filter plate to the outside of the drain tank. At this time, the worker can rinse the filter plate or remove the connecting bolts to replace it. After replacement or rinsing, the mounting frame is pushed back into the drain tank and re-fixed by the fixing component. This makes the maintenance and replacement of the filter plate more convenient for the worker, without having to disassemble the entire drain tank.

[0015] Optionally, the fixing assembly includes two fixing plates slidably connected to the outer surface of the drain tank. The two fixing plates are disposed on the upper and lower sides of the mounting frame. Each fixing plate is provided with a pin plate. Guide blocks are provided on opposite sides of the fixing plates. A guide groove is formed on the outer surface of the drain tank to slide with the guide blocks. A return spring is provided in each guide groove. The return spring pulls the fixing plate away from the mounting frame. A screw and a guide rod are respectively provided on opposite sides of the mounting frame. A pin sleeve that engages with the two pin plates is threaded onto the screw. The end of the pin sleeve away from the screw is slidably sleeved on the guide rod. When the two pin plates engage with the pin sleeve, the two fixing plates abut against the outer surface of the mounting frame.

[0016] By adopting the above technical solution, when the filter plate needs to be pulled out, the worker rotates the screw forward. Under the guidance of the guide rod, the screw drives the pin sleeve to move outward until it disengages from the two pin plates. At this time, the two fixed plates move in opposite directions under the action of the return spring until they disengage from the outer surface of the mounting frame. Then, the worker pulls the mounting frame to make the filter plate slide out of the drain box. When installing the filter plate, the mounting frame is pushed back to the preset position of the drain box. Then, the two fixed plates are manually pulled relative to each other to make the opposite end faces of the two pin plates fit together. Then, the screw is rotated in the opposite direction to drive the pin sleeve to move inward along the guide rod until the pin sleeve is completely fitted onto the outside of the two pin plates.

[0017] Optionally, the slag discharge pipe is detachably connected to the pressing box via a connecting flange.

[0018] By adopting the above technical solution, workers can disassemble and assemble the slag discharge pipe through the connecting flange, which facilitates the workers to inspect and maintain the extrusion components inside the slag discharge pipe without disassembling the entire pressing box, thus improving the convenience of maintenance for workers.

[0019] In summary, this application includes at least one of the following beneficial technical effects: 1. This application sets up an extrusion assembly to perform a secondary extrusion on the material that has been extruded once by the screw press, further squeezing out the water that has not been discharged from the material. The water that has been discharged collects along the inner wall of the slag discharge pipe to the bottom connecting pipe, and then flows into the drainage box through the connecting pipe and is discharged together with the water dewatered by the first extrusion. In this way, the secondary extrusion of the material and the directional collection and discharge of water are achieved, which improves the dewatering effect of the screw press. 2. By setting up a pushing component and an extrusion arc plate, during the movement of the extrusion ring, the pushing component intermittently overcomes the spring force to drive the extrusion arc plate to extend towards the center of the slag discharge pipe. On the basis of the axial extrusion of the extrusion ring, the material is subjected to an additional radial intermittent compaction effect, thereby further improving the dewatering effect of the screw press. 3. By setting up an installation frame and fixing components, when the filter plate becomes clogged or damaged, the worker can release the fixing components and then pull out the installation frame to move the filter plate to the outside of the drain tank. At this time, the worker can rinse the filter plate or remove the connecting bolts to replace it. After replacement or rinsing, the installation frame is pushed back into the drain tank and re-fixed by the fixing components. This makes the maintenance and replacement of the filter plate more convenient for workers, without the need to disassemble the entire drain tank. Attached Figure Description

[0020] Figure 1 This is a structural diagram of this application.

[0021] Figure 2 This is a cross-sectional view of the slag discharge pipe in an embodiment of this application.

[0022] Figure 3 This is a cross-sectional view of the extrusion ring in an embodiment of this application.

[0023] Figure 4 This is a schematic diagram of the structure of the fixed component in the embodiments of this application.

[0024] Explanation of reference numerals in the attached drawings: 01, Screw assembly; 1, Pressing box; 101, Feed pipe; 102, Connecting flange; 2, Drainage box; 21, Filter plate; 22, Drainage pipe; 23, Guide groove; 3, Slag discharge pipe; 31, Moving groove; 32, Connecting pipe; 33, Pushing groove; 4, Extrusion assembly; 41, Extrusion ring; 411, Sliding groove; 412, Limiting groove; 413, Spring; 414, Connecting sleeve; 42, Moving block; 43, Moving screw; 44, Driving component; 5, Sliding rod; 51, Extrusion arc plate; 52, Limiting block; 6, Pushing assembly; 61, First magnetic plate; 62, Second magnetic plate; 7, Corrugated cover; 8, Mounting frame; 81, Connecting bolt; 9, Fixing assembly; 91, Fixing plate; 92, Return spring; 93, Pin plate; 94, Screw; 95, Guide rod; 96, Pin sleeve. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0026] This application discloses a screw press for wastewater discharge.

[0027] Reference Figure 1 and Figure 4A screw press for wastewater discharge includes a pressing box 1. Inside the pressing box 1, a screw device 01 for extruding and conveying materials is installed. The screw device 01 is existing technology in this field, and its specific composition and principle will not be described in this embodiment. The top of the pressing box 1 is connected to a feed pipe 101 for adding materials, and the bottom is integrally formed with a drain box 2 for collecting wastewater. A slag discharge pipe 3 is detachably installed at the outlet through a connecting flange 102. The slag discharge pipe 3 is inclined upward. Inside the drain box 2, a filter plate 21 for filtering wastewater is installed, and a drain pipe 22 connected to the drainage system is installed at the bottom.

[0028] During operation, the slag collected by the screen is poured into the press box 1 through the feed pipe 101. Under the action of the spiral plate of the spiral device 01, the material is continuously squeezed and dehydrated. The water squeezed out from the material is collected in the drain box 2. After one compression process, the material is pushed to the slag discharge pipe 3.

[0029] Reference Figure 1 and Figure 2 The slag discharge pipe 3 is equipped with a compression assembly 4 for secondary compression of the material. The compression assembly 4 includes a compression ring 41 slidably connected to the inner wall of the slag discharge pipe 3. The sliding direction of the compression ring 41 is parallel to the axis of the slag discharge pipe 3. Moving blocks 42 are fixedly connected to the radially opposite outer surfaces of the compression ring 41. The inner wall of the slag discharge pipe 3 is provided with a moving groove 31 that slides with the moving block 42 along the axial direction. The cross-section of the moving block 42 and the moving groove 31 is square. A moving screw 43 is rotatably connected inside one of the moving grooves 31. The moving block 42 in the moving groove 31 is threadedly connected to the moving screw 43. A driving component 44 is installed on the slag discharge pipe 3 to drive the moving screw 43 to rotate. In this embodiment, the driving component 44 is a geared motor and a gearbox. The specific driving principle is existing technology and will not be described in detail in this embodiment. A connecting pipe 32 connected to the drainage tank 2 is installed at the bottom of the slag discharge pipe 3. The connection port between the connecting pipe 32 and the drainage tank 2 is located above the filter plate 21.

[0030] After the material has been squeezed once, it enters the slag discharge pipe 3. The drive component 44 drives the moving screw 43 to rotate. Under the guidance of the moving groove 31 and the moving block 42, the moving screw 43 drives the extrusion ring 41 to move along the axis of the slag discharge pipe 3. During the movement, the material after the first extrusion is subjected to secondary compaction and extrusion, which further squeezes out the water that has not been discharged from the material. The extruded water flows along the inner wall of the slag discharge pipe 3 to the bottom connecting pipe 32, and then flows into the drainage box 2 through the connecting pipe 32 and is discharged together with the water dewatered by the first extrusion. In this way, the secondary extrusion of the material and the directional collection and discharge of water are realized, which improves the dewatering effect of the screw press.

[0031] Reference Figure 2 and Figure 3To further improve the extrusion effect of the extrusion ring 41, multiple sliding grooves 411 are provided circumferentially on the inner wall of the extrusion ring 41. The multiple sliding grooves 411 are evenly distributed at equal intervals between the two moving blocks 42. A sliding rod 5 is slidably connected inside each sliding groove 411. The end of the sliding rod 5 extends out of the sliding groove 411 and is fixedly connected to an extrusion arc plate 51. The arc of the extrusion arc plate 51 is the same as the arc of the extrusion ring 41. A limit block 52 is fixedly connected to the outer surface of the sliding rod 5. A limit groove 412 is provided on the inner wall of the sliding groove 411 to slide with the limit block 52. A spring 413 is provided inside the limit groove 412. One end of the spring 413 is fixedly connected to the inner wall of the limit groove 412 near the center of the slag discharge pipe 3, and the other end is fixedly connected to the limit block 52. In the natural state of the spring 413, the extrusion arc plate 51 abuts against the inner wall of the extrusion ring 41.

[0032] Reference Figure 2 and Figure 3 The slag discharge pipe 3 is provided with a pushing component 6 corresponding to a plurality of extrusion arc plates 51. The inner side wall of the slag discharge pipe 3 is provided with a pushing groove 33 along the axial direction, which slides and engages with the sliding rod 5. The pushing component 6 includes a first magnetic piece 61 fixedly connected to the end of the sliding rod 5 away from the extrusion arc plate 51. The first magnetic piece 61 is slidably disposed inside the pushing groove 33. A plurality of second magnetic pieces 62 are installed at intervals along the length direction on the inner side wall of the pushing groove 33. The second magnetic pieces 62 and the first magnetic pieces 61 are magnetically repelled, and the magnetic force is greater than the elastic force of the spring 413.

[0033] As the extrusion ring 41 moves along the inner wall of the slag discharge pipe 3, it drives the sliding rod 5 to move within the pushing groove 33. When the first magnetic piece 61 approaches the second magnetic piece 62, the magnetic repulsion force generated by the two is greater than the elastic force of the spring 413, which in turn pushes the sliding rod 5 to extend the extrusion arc plate 51 toward the center of the slag discharge pipe 3, thereby forming radial extrusion on the material in the slag discharge pipe 3. When the extrusion ring 41 continues to move and the first magnetic piece 61 moves away from the second magnetic piece 62, the magnetic repulsion force disappears, and the spring 413 pulls the limiting block 52 back to its original position under its own elastic force, causing the sliding rod 5 and the extrusion arc plate 51 to retract to the inner wall of the extrusion ring 41. In this way, the extrusion arc plate 51 achieves intermittent radial extension and contraction as the extrusion ring 41 continues to move. On the basis of the axial extrusion of the extrusion ring 41, the material is subjected to intermittent radial compaction, thereby further improving the dewatering effect of the screw press.

[0034] Reference Figure 2 and Figure 3A connecting sleeve 414 that slides with the sliding groove 411 is fixedly connected to the outer surface of the extrusion ring 41 near the inner wall of the slag discharge pipe 3. The connecting sleeve 414 is slidably sleeved on the outer periphery of the sliding rod 5. Corrugated covers 7 are fixedly connected to the outer surfaces of the connecting sleeve 414 and the moving block 42. The other end of the corrugated cover 7 on the connecting sleeve 414 is fixedly connected to the inner wall of the push groove 33. The other end of the corrugated cover 7 on the moving block 42 is fixedly connected to the inner wall of the moving groove 31. In this embodiment, the cross section of the corrugated cover 7 is corrugated, and its expansion and contraction principle is the same as that of the corrugated hose. The corrugated cover 7 can be connected to the inner wall of the moving groove 31 and the moving block 42 by adhesive. The above are all prior art, so they will not be described again in this application.

[0035] As the extrusion ring 41 moves, the corrugated covers 7 on both sides of the connecting sleeve 414 and the moving block 42 are squeezed or stretched, and always cover the moving groove 31 or the pushing groove 33 at the location. This reduces the probability of dirty materials entering the moving groove 31 and the pushing groove 33, and reduces the influence of materials on the moving screw 43 and the second magnetic sheet 62, thereby ensuring the stability of the axial movement of the extrusion ring 41 and the radial extension and retraction of the extrusion arc plate 51.

[0036] Reference Figure 1 and Figure 4 As the filter plate 21 is used for a longer period of time, the surface of the filter plate 21 may become clogged due to the accumulation of impurities. This will prevent sewage from flowing smoothly through the filter holes into the drainage tank 2, resulting in a reduction in the dewatering effect. In order to solve the above technical problem, an installation frame 8 is slidably connected to the inner wall of the drainage tank 2. In this embodiment, a protrusion (not shown in the figure) is fixedly connected to the outer surface of the installation frame 8. A groove (not shown in the figure) is opened on the inner wall of the drainage tank 2 to slide with the protrusion, thereby realizing the sliding of the installation frame 8. The filter plate 21 is detachably connected to the installation frame 8 by multiple connecting bolts 81. In this embodiment, the connecting bolts 81 are countersunk bolts. The outer surface of the installation frame 8 is fixed to the drainage tank 2 by the fixing component 9.

[0037] Reference Figure 1 and Figure 4 The fixing component 9 includes two fixing plates 91 slidably connected to the outer surface of the drain tank 2. The two fixing plates 91 are respectively set on the upper and lower sides of the mounting frame 8. Each fixing plate 91 has a guide block (not shown in the figure) integrally formed on opposite sides. The outer surface of the drain tank 2 is provided with a guide groove 23 that slides with the guide block. A return spring 92 is installed inside the guide groove 23. One end of the return spring 92 is fixedly connected to the inner side wall of the guide groove 23 away from the mounting frame 8, and the other end is fixedly connected to the guide block. The spring force of the return spring 92 causes the fixing plate 91 to detach from the mounting frame 8. The opposite ends of the two fixing plates 91 are integrally formed with a pin plate 93, which is perpendicular to the fixing plate 91.

[0038] Reference Figure 1 and Figure 4 A screw 94 and a guide rod 95 are respectively provided on the left and right sides of the outer surface of the mounting frame 8. The screw 94 is rotatably connected to the outer surface of the mounting frame 8, and the guide rod 95 is fixedly connected to the outer surface of the mounting frame 8. A pin sleeve 96 is threadedly connected to the screw 94 and engages with two pin plates 93. The end of the pin sleeve 96 away from the screw 94 is slidably sleeved on the guide rod 95. The moving direction of the pin sleeve 96 is the same as the moving direction of the mounting frame 8. When the two pin plates 93 engage with the pin sleeve 96, the two fixing plates 91 abut against the outer surface of the mounting frame 8.

[0039] Reference Figure 1 and Figure 4 When the filter plate 21 becomes clogged or damaged, the worker rotates the screw 94 in the forward direction. Under the guidance of the guide rod 95, the screw 94 drives the pin sleeve 96 to move outward until it disengages from the two pin plates 93. At this time, the two fixing plates 91 move in opposite directions under the action of the return spring 92 until they disengage from the outer surface of the mounting frame 8. Then, the worker pulls the mounting frame 8 to make the filter plate 21 slide out of the drain box 2. The worker can then rinse the filter plate 21 or remove the connecting bolts 81 to replace it. After rinsing or replacement, the worker pushes the mounting frame 8 back to the preset position of the drain tank 2, then manually pulls the two fixing plates 91 relative to each other to make the opposite end faces of the two pin plates 93 fit together. Then, the screw 94 is rotated in the opposite direction to drive the pin sleeve 96 to move inward along the guide rod 95 until the pin sleeve 96 is completely fitted onto the outside of the two pin plates 93. At this time, the two fixing plates 91 abut against the outer surface of the mounting frame 8, thereby fixing the mounting frame 8. In this way, the rinsing and replacement of the clogged or damaged filter plate 21 is completed without disassembling the entire drain tank 2, making the operation more convenient.

[0040] The implementation principle of a screw press for wastewater discharge in this application embodiment is as follows: During dewatering, the material is fed into the pressing box 1 through the feed pipe 101. The screw device 01 performs a first-stage compression dewatering on the material. Subsequently, the compressed and dewatered material enters the slag discharge pipe 3. The driving component 44 drives the moving screw 43 to rotate. Under the guidance of the moving groove 31 and the moving block 42, the moving screw 43 drives the extrusion ring 41 to move along the axial direction of the slag discharge pipe 3. During the movement, the material after the first compression is subjected to a second-stage compaction and extrusion, further squeezing out the water that has not been completely discharged from the material. The extruded water collects along the inner wall of the slag discharge pipe 3 to the bottom connecting pipe 32, and flows into the drainage box 2 through the connecting pipe 32 and is discharged together with the water dewatered by the first compression. In this way, the secondary compression of the material and the directional collection and discharge of water are realized, which improves the dewatering effect of the screw press.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A screw press for wastewater discharge, comprising a pressing box (1), wherein a screw device (01) is provided inside the pressing box (1), and a feed pipe (101), a drain box (2), and a slag discharge pipe (3) are connected and connected to the pressing box (1), wherein a filter plate (21) is provided inside the drain box (2), characterized in that, The slag discharge pipe (3) is provided with an extrusion assembly (4). The extrusion assembly (4) includes an extrusion ring (41) slidably connected to the inner wall of the slag discharge pipe (3). Movable blocks (42) are provided on both sides of the extrusion ring (41). The inner wall of the slag discharge pipe (3) is provided with a moving groove (31) that slides with the moving block (42). A moving screw (43) is rotatably connected inside one of the moving grooves (31). The moving block (42) is threadedly connected to the moving screw (43). A driving member (44) is provided on the slag discharge pipe (3) to drive the moving screw (43) to rotate. A connecting pipe (32) communicating with the drainage tank (2) is provided at the bottom of the slag discharge pipe (3).

2. A screw press for wastewater discharge according to claim 1, characterized in that, The inner wall of the extrusion ring (41) is provided with a plurality of sliding grooves (411) along the circumferential direction. Each sliding groove (411) is slidably connected to a sliding rod (5). The end of the sliding rod (5) extends out of the sliding groove (411) and is provided with an extrusion arc plate (51). A limit block (52) is provided on the outer surface of the sliding rod (5). A limit groove (412) is provided on the inner wall of the sliding groove (411) to slide with the limit block (52). The inner wall of the limit groove (412) and the limit block (52) are connected by a spring (413). In the natural state of the spring (413), the extrusion arc plate (51) abuts against the inner wall of the extrusion ring (41). A pushing component (6) is provided in the slag discharge pipe (3). The pushing component (6) intermittently overcomes the elastic force of the spring (413) to drive the limit block (52) to move.

3. A screw press for wastewater discharge according to claim 2, characterized in that, The inner wall of the slag discharge pipe (3) is provided with a pushing groove (33) that slides with the sliding rod (5) along the axial direction. The pushing assembly (6) includes a first magnetic piece (61) disposed at the end of the sliding rod (5) away from the extrusion arc plate (51). A plurality of second magnetic pieces (62) are spaced apart along the length direction on the inner wall of the pushing groove (33). The second magnetic pieces (62) and the first magnetic pieces (61) are magnetically repelled, and the magnetic force is greater than the elastic force of the spring (413).

4. A screw press for wastewater discharge according to claim 3, characterized in that, The outer surface of the extrusion ring (41) is provided with a connecting sleeve (414) that slides in cooperation with the sliding groove (411). The connecting sleeve (414) is slidably sleeved on the outer periphery of the sliding rod (5). Corrugated covers (7) are provided on the outer surfaces of the connecting sleeve (414) and the moving block (42). The other end of the corrugated cover (7) on the connecting sleeve (414) is provided on the inner wall of the pushing groove (33), and the other end of the corrugated cover (7) on the moving block (42) is provided on the inner wall of the moving groove (31).

5. A screw press for wastewater discharge according to claim 1, characterized in that, The inner wall of the drainage tank (2) is slidably connected to an installation frame (8). The filter plate (21) is detachably connected to the installation frame (8) by multiple connecting bolts (81). The connection port of the connecting pipe (32) and the drainage tank (2) is located above the filter plate (21). The installation frame (8) is fixed inside the drainage tank (2) by a fixing component (9).

6. A screw press for wastewater discharge according to claim 5, characterized in that, The fixing assembly (9) includes two fixing plates (91) slidably connected to the outer surface of the drainage tank (2). The two fixing plates (91) are arranged on the upper and lower sides of the mounting frame (8). Each fixing plate (91) is provided with a pin plate (93). Guide blocks are provided on opposite sides of the fixing plates (91). A guide groove (23) is opened on the outer surface of the drainage tank (2) to slide with the guide block. A return spring (92) is provided in each guide groove (23). The return spring (92) pulls the fixing plate (91) to slide. Plate (91) is away from the mounting frame (8). On opposite sides of the mounting frame (8) are provided screws (94) and guide rods (95). Screws (94) are threadedly connected to the screws (94) and are engaged with the two pin plates (93). The end of the pin plate (96) away from the screws (94) is slidably sleeved on the guide rod (95). When the two pin plates (93) are engaged with the pin plate (96), the two fixing plates (91) abut against the outer surface of the mounting frame (8).

7. A screw press for wastewater discharge according to claim 1, characterized in that, The slag discharge pipe (3) is detachably connected to the pressing box (1) via a connecting flange (102).

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