A filtering mechanism with double-rotation helical rotation and one-way pushing

Abstract

The application relates to the technical field of screw solid-liquid separators, and discloses a filtering mechanism with double-rotation screw rotation and one-way material pushing, which comprises a screw shaft, the screw shaft penetrates through a filtering cavity, the screw shaft comprises a central shaft and screw blades, the central shaft is free of screw blades at the tail end, and a smooth section is formed; a sludge discharging box is arranged at the discharging end of the filtering cavity, the sludge discharging box is provided with a sludge discharging hole, and the smooth section penetrates through the sludge discharging hole; a back pressure plate group comprises a back pressure plate and reverse screw leaves arranged on the back pressure plate, the screw direction of the reverse screw leaves is opposite to that of the screw blades, and the reverse screw leaves are arranged around the smooth section; a reverse driving mechanism is used for driving the back pressure plate to rotate, the rotation direction of the back pressure plate is opposite to that of the central shaft; and the reverse screw leaves and the screw blades of the screw shaft have a spacing. The application solves the problems of sludge material blockage and reverse sludge running.

Description

Technical Field

[0001] This application relates to the technical field of spiral solid-liquid separators, and in particular to a filtration mechanism with dual-rotating spirals and unidirectional material feeding. Background Technology

[0002] Solid-liquid separation equipment is a crucial component in wastewater treatment processes, essential for ensuring the proper functioning of these processes and thus indispensable. The effectiveness of solid-liquid separation directly impacts the overall wastewater treatment outcome.

[0003] A Chinese invention patent application with application number 201610533983.4 discloses a pendulum-type spiral solid-liquid separator, which includes a fixed ring, a movable ring, and a spiral shaft passing through the filtration space. The spiral shaft has fixed rings and movable rings arranged alternately in the radial direction. It also includes a main drive rod, a secondary drive rod, and a positioning rod. One end of the conveyor head is used for feeding, and the other end is used for discharging. Feeding and solid-liquid separation are achieved by rotating the spiral shaft.

[0004] Solid-liquid separators typically have a sludge discharge box at the discharge port, through which the screw shaft passes and connects to the drive motor. A back pressure plate is installed on the outer wall of the inner cavity of the screw shaft within the sludge discharge box. This back pressure plate is located at the discharge port of the screw dewatering machine and is used to control the discharge of sludge. During solid-liquid separation, the material moves along the screw shaft towards the discharge port. The moisture content of the sludge gradually decreases, and the pressure near the discharge port is relatively high, making it prone to clogging and even reverse sludge flow. Summary of the Invention

[0005] This application provides a filter mechanism with dual-rotation spiral and unidirectional material pushing. By setting a reverse spiral blade on the back pressure plate, the back pressure plate and the spiral shaft rotate in opposite directions. The reverse spiral blade can rotate in the opposite direction at the end of the spiral shaft, thereby digging out the sludge material at the discharge port and solving the problem of sludge material blockage. There is a gap between the reverse spiral blade and the spiral shaft blade, so that a mud wall can be formed at the gap during the discharge process, solving the problem of reverse mud runoff.

[0006] The technical solution adopted in this application is as follows:

[0007] A filter mechanism with dual-rotation spiral and unidirectional material feeding includes:

[0008] A spiral shaft extends through the filter cavity. The spiral shaft includes a central shaft and spiral blades. The end of the central shaft has no spiral blades and forms a smooth section.

[0009] A mud discharge box is located at the discharge end of the filter chamber. The mud discharge box has a mud discharge hole, and the smooth section passes through the mud discharge hole.

[0010] A back pressure plate assembly, the back pressure plate assembly including a back pressure plate and a reverse spiral blade disposed on the back pressure plate, the spiral direction of the reverse spiral blade being opposite to the spiral direction of the spiral blade, the reverse spiral blade being wound around the smooth section;

[0011] A reverse drive mechanism is used to drive the back pressure plate to rotate, and the rotation direction of the back pressure plate is opposite to the rotation direction of the central shaft, so that the reverse spiral blade receives the material conveyed by the spiral blade and continues to convey it towards the discharge end.

[0012] By adopting the above technical solution, when the material is pushed to the position of the smooth section, the reverse spiral blade can receive the material conveyed by the spiral blade and continue to convey it towards the discharge end, thus solving the problem of sludge blockage.

[0013] Optionally, the spiral shaft has two, and the spiral blades of two adjacent spiral shafts are interlocked and interlocked.

[0014] The end of the spiral shaft is provided with a conical spiral shaft structure, which is located in the filter chamber. From the feed end to the discharge end of the filter chamber, the conical spiral shaft structure is such that the diameter of the central shaft gradually increases to form a conical structure, while the shaft diameter of the spiral blades set on the conical structure gradually decreases. At this time, the back pressure plate is a circular structure, and the two back pressure plates are arranged side by side with the distance between them approaching zero.

[0015] By adopting the above technical solution, when there are two spiral shafts, the reverse drive mechanism can drive the two back pressure plates and their respective corresponding spiral shafts to rotate in opposite directions, thereby achieving the effect of dredging mud in the smooth section by the reverse spiral blades; when there is a conical spiral shaft structure on the central shaft, a circular plate-shaped back pressure plate can be used to block mud, and the two back pressure plates are arranged side by side and will not affect each other.

[0016] Optionally, there are two spiral shafts, and the spiral blades of two adjacent spiral shafts are interlocked and interlocked; when the diameter of the central shaft does not change, the back pressure plate is an eccentric circle or ellipse, and when adjacent back pressure plates rotate, the distance between them approaches zero and remains equal.

[0017] By adopting the above technical solution, when the shaft diameter of the central shaft does not change, the size of the mud outlet hole needs to correspond to the spiral blade. Therefore, the back pressure plate is an elliptical structure or an eccentric plate structure, so as not to affect the discharge. In this case, the back pressure plates can be staggered.

[0018] Optionally, the reverse drive mechanism is powered by one of the spiral shafts or an external drive source, driving the back pressure plate and the corresponding spiral shafts to rotate in opposite directions.

[0019] By adopting the above technical solution, when the two helical shafts rotate in opposite directions, the reverse drive mechanism uses one of the helical shafts as a power source, combined with the gear and sprocket engagement, to achieve the reverse rotation of the back pressure plate, or it can drive the back pressure plate to rotate via the first drive shaft. When the helical shafts rotate in the same direction, the drive shaft drives the back pressure plate to rotate in the opposite direction. The power source of the drive shaft can be selected from an additional drive source, or it can use one of the helical shafts as a power source, both of which can achieve the reverse rotation of the back pressure plate. The power of the reverse drive mechanism can be adaptively adjusted according to the actual situation.

[0020] Optionally, a gap is provided between the end of the reverse spiral blade away from the back pressure plate and the end of the spiral shaft blade.

[0021] By adopting the above technical solution, there is a gap between the reverse spiral blades and the spiral shaft blades, so that a mud wall can be formed at the gap position during the discharge process, thereby effectively reducing the situation of sludge flowing backward.

[0022] Optionally, a diversion pin is also included, which is disposed in the gap between the spiral blade and the reverse spiral blade, for scraping off material on the central shaft.

[0023] By adopting the above technical solution, the caking of silt on the central shaft can be reduced under the action of the diversion pin.

[0024] Optionally, the back pressure plate assembly further includes a sleeve connected to the back pressure plate and a docking plate connected to the sleeve, wherein the back pressure plate is connected to the reverse drive mechanism through the docking plate.

[0025] By adopting the above technical solution, the back pressure plate is connected to the docking plate and the reverse drive mechanism, which facilitates the connection of the back pressure plate. The reverse drive mechanism drives the docking plate and the spiral shaft to rotate in the opposite direction, thereby driving the back pressure plate and the spiral shaft to rotate in the opposite direction.

[0026] Optionally, an elastic element connects the docking plate and the reverse drive mechanism.

[0027] By adopting the above technical solution, an elastic element is connected between the docking plate and the reverse drive mechanism, which can buffer the docking plate, allowing it to slide within a certain range and drive the back pressure plate to move, thereby facilitating mud discharge.

[0028] Optionally, both central shafts are provided with sealing plate assemblies for limiting the reversing mechanism.

[0029] By adopting the above technical solution, the reverse drive mechanism at the corresponding position can be limited under the action of the sealing plate assembly, thereby improving its stability when connected to the central shaft.

[0030] Optionally, the docking plate is provided with a screw assembly, which passes through the docking plate and is used to connect with the reverse drive mechanism.

[0031] By adopting the above technical solution, the docking plate and the reverse drive mechanism are connected by screws, thereby realizing the connection between the back plate and the reverse drive mechanism. The connection is convenient and the structure is simple.

[0032] In summary, this application includes at least one of the following beneficial effects:

[0033] 1. The reverse drive mechanism drives the back pressure plate and the connected spiral shaft to rotate in opposite directions, and the reverse spiral blades can discharge material in the opposite direction at the smooth section, which solves the problem of sludge blockage.

[0034] 2. There is a gap between the reverse spiral blades and the spiral shaft blades, so that a mud wall can be formed at the gap position during the discharge process, thereby effectively reducing the situation of sludge flowing backward.

[0035] 3. By setting diversion pins that extend to the smooth section, the occurrence of mud caking can be reduced. Attached Figure Description

[0036] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0037] Figure 2 This is an exploded view of an embodiment of this application;

[0038] Figure 3 This is a schematic diagram of the reverse drive mechanism when the two helical shafts rotate in opposite directions in an embodiment of this application;

[0039] Figure 4 This is a schematic diagram of the back pressure plate when the spiral shaft has the same diameter;

[0040] Figure 5 This is a schematic diagram illustrating the reverse spiral blade in an embodiment of this application;

[0041] Figure 6 This is a schematic diagram of the reverse drive mechanism when the two helical shafts rotate in the same direction in an embodiment of this application;

[0042] Figure 7 This is an explosion diagram of two spiral shafts rotating in the same direction in an embodiment of this application.

[0043] Explanation of reference numerals in the attached drawings: 1. Spiral shaft; 2. Sludge discharge box; 3. Back pressure plate; 4. Reverse drive mechanism; 41. Rotating cylinder; 42. Linkage gear; 43. Synchronizing element; 44. First gear; 45. Second gear; 46. Third gear; 5. Sludge discharge hole; 6. Smooth section; 7. Reverse spiral blade; 8. Sludge pressing section; 9. Diverting pin; 10. Sleeve; 11. Connecting plate; 12. Elastic element; 13. Sealing plate assembly; 14. Meshing gear; 15. Central shaft; 16. Power shaft; 17. Spiral blade; 18. Conical spiral shaft structure; 19. Back pressure plate assembly. Detailed Implementation

[0044] The present application will be further described in detail below with reference to the accompanying drawings.

[0045] This application discloses a filter mechanism with dual-directional spiral rotation and unidirectional material feeding. (Refer to...) Figure 1 and Figure 2 The filtration mechanism of this embodiment includes a spiral shaft 1, a sludge discharge box 2 for discharging sludge, and a back pressure plate assembly 19. It also includes a reverse drive mechanism 4 installed between the spiral shaft 1 and the back pressure plate 3. The back pressure plate assembly 19 includes a back pressure plate 3 and reverse spiral blades 7 installed on the back pressure plate 3. The spiral shaft 1 passes through the filtration chamber of the solid-liquid separation device, and the sludge discharge box 2 is located at the discharge end of the filtration chamber. The spiral shaft 1 includes a central shaft 15 and spiral blades 17. One end of the central shaft 15 passes through the sludge discharge box 2 and is connected to an external drive source, so that the rotation of the central shaft 15 drives the spiral blades 17 to rotate synchronously, thereby pushing the material. The back pressure plate 3 is located in the sludge discharge box 2 and is sleeved on the central shaft 15. The reverse drive mechanism 4 is used to drive the back pressure plate 3 and the spiral shaft 1 to rotate in opposite directions.

[0046] The sludge discharge box 2 has a hollow internal structure. The central shaft 15 passes through the sludge discharge box 2 and extends partially beyond its surface for connection to an external drive source. The drive source can be a motor or similar device, which drives the rotation of the screw shaft 1. (The motor is not shown in the diagram; this is prior art and not the focus of this application, so it will not be elaborated upon here.) A sludge discharge hole 5 is provided on the side wall of the sludge discharge box 2. The screw shaft 1 propels the sludge forward and continuously discharges liquid. The filtered sludge is discharged from the sludge discharge hole 5. A back pressure plate 3 is located inside the sludge discharge box 2 and is fitted onto the central shaft 15. There is a certain gap between the back pressure plate 3 and the sludge discharge hole 5 during discharge. Finally, the sludge after solid-liquid separation is discharged through this gap and falls downwards.

[0047] Reference Figure 2 and Figure 3 The central shaft 15 has no helical blades 17 at its end, forming a smooth section 6, part of which is located within the filter cavity. Figure 4The reverse spiral blade 7 on the back pressure plate 3 passes through the mud outlet hole 5 and is wound around the outer wall of the smooth section 6 in the filter chamber. The reverse spiral blade 7 and the spiral shaft blade 17 rotate in opposite directions, while the rotation direction of the back pressure plate 3 is opposite to that of the spiral shaft 1. Therefore, after the spiral shaft 1 pushes the filtered mud to the discharge end, the reverse spiral blade 7 can push the mud from the mud outlet hole 5 in the opposite direction. Discharging the mud by the reverse spiral blade 7 alleviates the blockage at the end of the discharge, and the reverse spiral blade 7 can scrape off the mud on the surface of the smooth section 6 at the discharge end, preventing the mud from adhering to the central shaft 15 near the discharge section and making it difficult to clean.

[0048] The helical shaft 1 can be one or two, see reference. Figure 2 and Figure 3 First, let's take the two spiral shafts 1 as examples. The two spiral shafts 1 can rotate in the same direction or in opposite directions. Each spiral shaft 1 is equipped with a back pressure plate 3, and the mud outlet 5 has a gourd-shaped structure that corresponds one-to-one with each spiral shaft 1. The reverse drive mechanism 4 is used to drive the back pressure plate 3 on each of the two spiral shafts 1 to rotate in opposite directions. The reverse drive mechanism 4 can use one of the spiral shafts 1 as power to drive the back pressure plate 3 to rotate, or it can be connected to an external power source to drive the back pressure plate 3 to rotate.

[0049] When there are two spiral shafts 1, the spiral blades of the two adjacent spiral shafts 1 are staggered and interlocked. A conical spiral structure 18 is provided at the end of the spiral shaft 1, and the conical spiral structure 18 is located in the filter cavity. The conical spiral structure 18 is characterized by the following: the diameter of the central shaft 15 gradually increases to form a conical structure, while the shaft diameter of the spiral blades provided on the conical structure gradually decreases, that is, the distance from the shaft diameter to the surface of the conical spiral structure 18 decreases; at this time, the back pressure plate 3 is a circular structure, and the two back pressure plates 3 are arranged side by side with the distance between them approaching zero.

[0050] Due to the presence of the conical spiral structure 18, a stepped structure can be formed at the end of the conical spiral structure 18 and at the central axis 15. The smooth section 6 corresponds to the stepped position, and the counter-rotating spiral blade 7 also corresponds to the stepped position. Due to the stepped structure, the size of the mud outlet 5 can be set relatively small. The back pressure plate 3 can be set as two circular plates. The two back pressure plates 3 are arranged side by side with a spacing close to zero, that is, the two back pressure plates 3 are close to contact each other. The back pressure plates 3 can correspond to the position of the mud outlet 5 respectively, and the back pressure plates 3 will not affect each other's rotation.

[0051] In other embodiments, refer to Figure 4The spiral shaft 1 has a constant diameter structure, meaning the diameter of the central shaft 15 remains unchanged. The smooth section 6 corresponds to the end of the spiral shaft 1, and the reverse spiral blade 7 is wound around the end of the spiral shaft 1. In this case, the size of the mud outlet 5 needs to correspond to the size of the spiral blade 17. Therefore, in this case, the back pressure plate 3 is selected as an elliptical or eccentric plate structure. When adjacent back pressure plates 3 rotate, the distance between them approaches zero and remains equal, so that the rotation between the two back pressure plates 3 will not interfere with each other. In other embodiments, the two back pressure plates 3 are staggered, that is, the two back pressure plates 3 are arranged one in front of the other and have overlapping parts.

[0052] Reference Figure 2 and Figure 3 A gap is left between the end of the reverse spiral blade 7 away from the back pressure plate 3 and the end of the spiral shaft blade 17, that is, there is a certain gap between the end of the reverse spiral blade 7 and the end of the smooth section 6. When the spiral shaft blade 17 pushes the mud to the smooth section 6, a mud wall can be formed at the position of this gap, which helps to slow down the reverse mud flow and reduce the blockage at the discharge end. The end of the spiral shaft 1 has a mud pressing section 8, which is a hollow shell structure. The mud pressing section 8 is part of the filter chamber of the water filtration equipment, and in other embodiments it can also be fixed to the side wall of the mud discharge box 2. The smooth section 6 is located in the inner cavity of the mud pressing section 8.

[0053] The filtration mechanism also includes a diverting pin 9, which passes through the over-pressed mud section 8 and extends onto the surface of the smooth section 6. The diverting pin 9 is positioned within the gap between the reverse spiral blade 7 and the spiral shaft blade 17, thus not affecting the rotation of the reverse spiral blade 7. Under the action of the diverting pin 9, the mud material can be separated during movement, thereby reducing mud caking. The diverting pin 9 can be tilted at a certain angle, allowing it to cooperate with the spiral shaft blade to push the material together.

[0054] Reference Figure 3 and Figure 5 The back pressure plate assembly 19 also includes a sleeve 10 connected to the back pressure plate 3. The sleeve 10 is slidably sleeved on the central shaft 15 and can rotate on the outer wall of the central shaft 15. The outer wall of the sleeve 10 away from the back pressure plate 3 is coaxially fixed to the docking plate 11. The back pressure plate 3 is connected to the reverse drive mechanism 4 through the docking plate 11.

[0055] Reference Figure 2 and Figure 3 First, when the two spiral shafts 1 rotate in opposite directions, the reverse drive mechanism 4 can use one of the central shafts 15 as a power source and combine it with sprockets and gears to achieve the effect of the respective central shafts 15 and the back pressure plate 3 rotating in opposite directions.

[0056] One of the central shafts 15 is connected to an external motor at its end. Both central shafts 15 have meshing gears 14 mounted on their outer walls. The two meshing gears 14 mesh with each other, causing one central shaft 15 to rotate and drive the other central shaft 15 to rotate in the opposite direction. This situation is called the two helical shafts 1 rotating in opposite directions.

[0057] When the two helical shafts 1 rotate in opposite directions, the reverse drive mechanism 4 uses one of the central shafts 15 as a power source to drive the back pressure plate 3 and the helical shafts 1 to rotate in opposite directions. The reverse drive mechanism 4 includes a rotating cylinder 41 rotatably mounted on the outer wall of one of the central shafts 15, two linkage gears 42, and a synchronizing element 43 installed between the rotating cylinder 41 and the other central shaft 15. The two linkage gears 42 mesh with each other, one linkage gear 42 is coaxially fixed to the outer wall of the rotating cylinder 41, and the other linkage gear 42 is rotatably connected to the side wall of the other central shaft 15 by means of a bearing. The mating disc 11 is connected to the adjacent linkage gear 42, and the rotation of the linkage gear 42 synchronously drives the mating disc 11 to rotate. The synchronizing element 43 is used to drive the rotating cylinder 41 and the other central shaft 15 to rotate in the same direction. The synchronizing element 43 can be a sprocket and chain installed between the rotating cylinder 41 and the central shaft 15.

[0058] Therefore, when the two spiral shafts 1 rotate in opposite directions, under the action of the synchronizing element 43, the rotating cylinder 41 and the central shaft 15 connected to the rotating cylinder 41 rotate in opposite directions, while the back pressure plate 3 connected to the rotating cylinder 41 rotates in the same direction as the rotating cylinder 41; and the two linkage gears 42 mesh, so that the rotation direction of the other linkage gear 42 is opposite to that of the rotating cylinder 41. Therefore, under the combined action of the synchronizing element 43, the rotating cylinder 41, and the linkage gear 42, the rotation direction of the two back pressure plates 3 is opposite to the direction of rotation of their respective connected spiral shafts 1.

[0059] Reference Figure 3 and Figure 5 An elastic element 12 is installed between the docking plate 11 and the adjacent linkage gear 42. The elastic element 12 is sleeved on the outer wall of the central shaft 15. The elasticity can be selected from a sheet spring or a spring. In this embodiment, the elastic element 12 is selected from a spring. Multiple screw groups are installed on the docking plate 11. The screw groups include multiple screws, and the ends of the screws pass through the docking plate and are threaded to the linkage gear 42. Therefore, when the linkage gear 42 rotates, it can synchronously drive the docking plate 11 to rotate. When the mud outlet 5 is discharging mud, it can push the back pressure plate 3 to move towards the linkage gear 42 to a certain extent, and the elastic element 12 is compressed.

[0060] Furthermore, to improve the stability of the linkage gear 42 and the rotating cylinder 41, a sealing plate assembly 13 is installed on the central shaft 15 on which the rotating cylinder 41 is mounted. The sealing plate assembly 13 is fixedly installed on the outer wall of the central shaft 15, and the sealing plate assembly 13 cannot slide on the central shaft 15. One end of the rotating cylinder 41 abuts against the sealing plate assembly 13, thereby making it less likely for the rotating cylinder 41 to deviate and improving the stability of the rotating cylinder 41. A sealing plate assembly 13 is also installed on another central shaft 15 and is used to cooperate with the linkage gear 42 on that central shaft 15 to limit the sliding of the linkage gear 42 on that central shaft 15.

[0061] When the two spiral shafts 1 rotate in opposite directions, and the reverse drive mechanism 4 drives the two back pressure plates 3 and the spiral shafts 1 to rotate in opposite directions via an external power source, in this case, the two linkage gears 42 are respectively rotatably connected to the outer walls of the two central shafts 15 and connected to the docking plate 11. Two drive shafts are installed on the sludge discharge box 2, and gears are coaxially fixed to the side walls of the drive shafts. These gears mesh with the linkage gears 42, thereby driving the corresponding back pressure plates 3 to rotate in opposite directions via the corresponding drive shafts (not shown in the figure).

[0062] Reference Figure 6 and Figure 7 When the two spiral shafts 1 rotate in the same direction, they can rotate in the same direction by three gears or by a chain and sprocket.

[0063] When the helical shaft 1 rotates in the same direction, the reverse drive mechanism 4 drives the back pressure plate 3 and the helical shaft 1 to rotate in the opposite direction by means of one of the helical shafts 1 or an external power source, in combination with a gear set.

[0064] In this configuration, the reverse drive mechanism 4 includes two first gears 44 rotatably connected to the outer wall of the helical shaft 1, and a second gear 45 meshing with both first gears 44 simultaneously. The drive shaft 16 is rotatably mounted on the mud discharge box 3, and the second gear 45 is coaxially fixedly mounted on the side wall of the drive shaft 16. The second gear 45 meshes with the two first gears 44. Therefore, the first gears 44 and the second gear 45 rotate in opposite directions; it is sufficient to make the second gear 45 rotate in the same direction as the helical shaft 1. The power source for the drive shaft 16 can be connected to an external motor, or a synchronous belt can be connected between the drive shaft 16 and one of the central shafts 15 to drive the synchronous rotation of the drive shaft 16. In this case, not only a synchronous chain can be used, but multiple gears can also be used for transmission, thereby enabling the second gear 45 to rotate in the same direction as the central shaft 15.

[0065] The mating discs 11 are respectively connected to the adjacent first gears 44, and the elastic element 12 is connected between the mating discs 11 and the first gears 44. In this case, the sealing plate assembly 13 is connected to the first gears 44 to limit the displacement of the first gears 44.

[0066] Furthermore, depending on the installation configuration of the equipment, the second gear 45 can be driven to rotate by an external drive source, ensuring that the rotation direction of the second gear 45 is the same as that of the central shaft 15. For example, refer to... Figure 6 By adding a third gear 46, which meshes with the second gear 45, and driven by an externally connected motor, the third gear 46 rotates in the opposite direction to the central shaft 15. This method can also drive the first gear 44 to rotate in the opposite direction to the central shaft 15.

[0067] Therefore, driven by the first gear 44 and the second gear 45, the rotation of the back pressure plate 3 is opposite to the rotation of the spiral shaft 1. Furthermore, the second gear 45 can rotate directly via the transmission of the central shaft 15, or be driven by an external power source, depending on the situation.

[0068] Alternatively, when there is only one helical shaft 1 (not shown in the figure), it connects to the mating disc 11 and the first gear 44. The reverse drive mechanism 4 only includes a second gear 45 meshing with the first gear 44 and the first gear 45, which are rotatably mounted on the central shaft 15. The second gear 45 is connected to the drive shaft 16, and its rotation drives the first gear 44 and the helical shaft 1 to rotate in the opposite direction. In this case, the drive shaft 16 can still be connected to an external power source or one of the central shafts 15 can be used as a power source.

[0069] The implementation principle of the filter mechanism with dual-rotation spiral and unidirectional material pushing in this application embodiment is as follows: the back pressure plate 3 and the connected spiral shaft 1 are driven to rotate in opposite directions by the reverse drive mechanism 4. The reverse spiral blades 7 can discharge material in the opposite direction at the position of the smooth section 6, thereby discharging the sludge at the discharge position, reducing the occurrence of blockage, reducing the occurrence of reverse mud runoff, and reducing the adhesion of mud blocks on the surface of the smooth section 6.

[0070] 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 filtering mechanism of double-rotational-spiral rotation and unidirectional material pushing, characterized in that, include: A spiral shaft extends through the filter cavity. The spiral shaft includes a central shaft and spiral blades. The end of the central shaft has no spiral blades and forms a smooth section. A mud discharge box is located at the discharge end of the filter chamber. The mud discharge box has a mud discharge hole, and the smooth section passes through the mud discharge hole. A back pressure plate assembly, the back pressure plate assembly including a back pressure plate and a reverse spiral blade disposed on the back pressure plate, the spiral direction of the reverse spiral blade being opposite to the spiral direction of the spiral blade, the reverse spiral blade being wound around the smooth section; A reverse drive mechanism is used to drive the back pressure plate to rotate, and the rotation direction of the back pressure plate is opposite to the rotation direction of the central shaft, so that the reverse spiral blades receive the material conveyed by the spiral blades and continue to convey it towards the discharge end. A gap is left between the end of the reverse spiral blade away from the back pressure plate and the end of the spiral shaft blade.

2. A filter mechanism according to claim 1, wherein, The spiral shaft has two, and the spiral blades of two adjacent spiral shafts are interlocked and interlocked. The end of the spiral shaft is provided with a conical spiral shaft structure, which is located in the filter chamber. From the feed end to the discharge end of the filter chamber, the conical spiral shaft structure is such that the diameter of the central shaft gradually increases to form a conical structure, while the shaft diameter of the spiral blades set on the conical structure gradually decreases. At this time, the back pressure plate is a circular structure, and the two back pressure plates are arranged side by side with the distance between them approaching zero.

3. The filtering mechanism of claim 1, wherein, The spiral shaft has two parts, and the spiral blades of the two adjacent spiral shafts are interlocked and interlocked; when the diameter of the central shaft does not change, the back pressure plate is an eccentric circle or ellipse, and when the adjacent back pressure plates rotate, the distance between them approaches zero and remains equal.

4. The dual-rotational, single-directional push mechanism of any one of claims 2 or 3, wherein, The reverse drive mechanism is powered by one of the spiral shafts or an external drive source, driving the back pressure plate and the corresponding spiral shafts to rotate in opposite directions.

5. The dual-rotational, single-directional push mechanism of claim 1, wherein, It also includes a diversion pin, which is disposed in the gap between the spiral blade and the reverse spiral blade, for scraping off material on the central shaft.

6. The dual-rotational, single-directional push mechanism of claim 2, wherein, The back pressure plate assembly also includes a sleeve connected to the back pressure plate and a docking plate connected to the sleeve. The back pressure plate is connected to the reverse drive mechanism through the docking plate.

7. A dual-rotational helical rotating and unidirectional pushing filter mechanism according to claim 6, wherein, An elastic element connects the docking plate and the reverse drive mechanism.

8. A dual-rotational helical rotating and unidirectional pushing filter mechanism according to claim 7, wherein, Both of the central shafts are provided with sealing plate groups for limiting the reverse drive mechanism.

9. The dual-rotational, single-directional push mechanism of claim 7, wherein, The docking plate is provided with a screw assembly, which passes through the docking plate and is used to connect with the reverse drive mechanism.

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