Filtering mechanism capable of achieving double-rotation-direction spiral rotation and one-way material pushing

Abstract

The invention relates to the technical field of spiral solid-liquid separators, and discloses a double-rotation-direction spiral rotation and one-way material pushing filtering mechanism which comprises a spiral shaft, the spiral shaft penetrates through a filtering cavity and comprises a center shaft and spiral blades, the tail end of the center shaft is not provided with the spiral blades, and a smooth section is formed; the sludge discharging box is located at the discharging end of the filtering cavity, a sludge outlet hole is formed in the sludge discharging box, and the smooth section penetrates through the sludge outlet hole; the back pressure plate group comprises a back pressure plate and a reverse spiral blade arranged on the back pressure plate, the spiral direction of the reverse spiral blade is opposite to that of the spiral blade, and the reverse spiral blade is wound on the smooth section; the reverse driving mechanism is used for driving the back pressure plate to rotate, and the rotating direction of the back pressure plate is opposite to the rotating direction of the central shaft; and a gap is formed between the reverse spiral blade and the spiral shaft blade of the spiral shaft. The problems of sludge material blockage and reverse sludge running are solved.

Description

Technical Field

[0001] The present application relates to the technical field of spiral solid-liquid separators, and in particular to a filtering mechanism with double-direction spiral rotation and unidirectional material pushing. Background Art

[0002] Solid-liquid separation equipment is a treatment equipment in the sewage treatment process. It is an important equipment to ensure the normal progress of the sewage treatment process and is an indispensable equipment. The effect of solid-liquid separation is directly related to the effect of sewage treatment.

[0003] The existing Chinese invention patent document with application number 201610533983.4 discloses a pendulum-like motion laminated spiral solid-liquid separator, including a fixed ring, a movable ring, and a spiral shaft passing through the filter space. The spiral shaft is provided with staggered fixed rings and movable rings 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 carried out by rotating the spiral shaft.

[0004] The solid-liquid separator is usually equipped with a mud discharge box at the discharge port, and the spiral shaft passes through the mud discharge box and is connected to the drive motor. A back pressure plate is installed on the outer wall of the inner cavity of the spiral shaft located in the mud discharge box. The back pressure plate is located at the discharge port of the spiral dewatering machine and is used to control the discharge of sludge in the spiral dewatering machine. During solid-liquid separation, the material moves toward the discharge port along the spiral shaft, the water content of the sludge gradually decreases, and the pressure near the discharge port is relatively high. The sludge is easily blocked at the discharge port, and even reverse mud flow occurs. Summary of the invention

[0005] The present application provides a filtering mechanism with double-direction spiral rotation and unidirectional pushing. By arranging reverse spiral blades on the back pressure plate, the back pressure plate and the spiral shaft rotate in reverse directions. The reverse spiral blades can rotate in reverse directions at the end position of the spiral shaft, thereby digging out the silt material at the discharge port, solving the problem of silt material blockage; there is a spacing between the reverse spiral blades and the spiral shaft blades of the spiral shaft, so that during the discharge process, a mud wall can be formed at the position of the spacing, solving the problem of reverse mud running.

[0006] This application adopts the following technical solutions: A filtering mechanism with double-direction spiral rotation and unidirectional material pushing, comprising: A spiral shaft, the spiral shaft runs through the filter cavity, the spiral shaft comprises a central shaft and spiral blades, and the end of the central shaft has no spiral blades, forming a smooth section; A mud discharge box, the mud discharge box is located at the discharge end of the filter cavity, the mud discharge box is provided with a mud discharge hole, and the smooth section passes through the mud discharge hole; A back pressure plate group, the back pressure plate group comprising a back pressure plate and a reverse spiral blade arranged on the back pressure plate, the spiral direction of the reverse spiral blade is opposite to the spiral direction of the spiral blade, and the reverse spiral blade is 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 axis, so that the reverse spiral blade receives the material transported by the spiral blade and continues to transport it toward the discharge end.

[0007] 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 transported by the spiral blade and continue to transport it toward the discharge end, thereby solving the blockage of sludge material.

[0008] Optionally, there are two spiral shafts, and the spiral blades of two adjacent spiral shafts are staggered and interlocked with each other; A conical spiral shaft structure is provided at the end of the spiral shaft, and the conical spiral shaft structure is located in the filter cavity. From the feed end to the discharge end of the filter cavity, the conical spiral shaft structure is as follows: the diameter of the central axis gradually increases to form a conical structure, and the shaft diameter of the spiral blades arranged 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 and the distance between them approaches zero.

[0009] By adopting the above technical solution, when there are two spiral shafts, the two back pressure plates and their corresponding spiral shafts can be driven to rotate in opposite directions through the reverse driving mechanism, thereby achieving the effect of reverse spiral blades dredging in smooth sections; when there is a conical spiral shaft structure on the central axis, 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.

[0010] Optionally, there are two spiral shafts, and the spiral blades of two adjacent spiral shafts are staggered and interlocked with each other; when the axial 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 spacing tends to zero and is always equal.

[0011] By adopting the above technical solution, when the axial diameter of the central axis does not change, the size of the mud outlet hole needs to correspond to the spiral blade, so the back pressure plate is an elliptical structure or an eccentric plate structure, which does not affect the discharge, and in this case the back pressure plates can be staggered.

[0012] Optionally, the reverse driving mechanism uses one of the screw shafts or an external driving source as a power source to drive the back pressure plate and the corresponding screw shaft to rotate in opposite directions.

[0013] By adopting the above technical solution, when the two screw shafts rotate in opposite directions, the reverse driving mechanism uses one of the screw shafts as a power source and combines with the gear sprocket to realize the reverse rotation of the back pressure plate, or drives the back pressure plate to rotate through the first driving shaft; and when the screw shafts rotate in the same direction, the back pressure plate is driven to rotate in the opposite direction by the driving shaft, and the power of the driving shaft can be selected from an additional driving source, or one of the screw shafts is used as a power source, both of which can realize the reverse rotation of the back pressure plate. The power of the reverse driving mechanism can be adaptively adjusted according to actual conditions.

[0014] Optionally, a gap is provided between an end of the reverse spiral blade away from the back pressure plate and a tip of the spiral shaft blade.

[0015] By adopting the above technical solution, there is a distance between the reverse spiral blades and the spiral shaft blades of the spiral shaft, so that during the discharging process, a mud wall can be formed at the position of the distance, thereby effectively reducing the reverse flow of sludge.

[0016] Optionally, a diverter pin is further included, which is arranged in the gap between the spiral blade and the reverse spiral blade and is used to scrape off the material on the central axis.

[0017] By adopting the above technical solution, the compaction of sludge on the central axis can be reduced under the action of the diverter pin.

[0018] Optionally, the back pressure plate group further includes a sleeve connected to the back pressure plate, and a docking plate connected to the sleeve, and the back pressure plate is connected to the reverse drive mechanism via the docking plate.

[0019] By adopting the above technical solution, the back pressure plate is connected through the docking disk and the reverse drive mechanism, which facilitates the connection of the back pressure plate. The reverse drive mechanism drives the docking disk and the screw shaft to rotate in the opposite direction, thereby driving the back pressure plate and the screw shaft to rotate in the opposite direction.

[0020] Optionally, an elastic member is connected between the docking plate and the reverse driving mechanism.

[0021] By adopting the above technical solution, an elastic member is connected between the docking disc and the reverse drive mechanism, which can buffer the docking disc, so that the docking disc has a sliding movement within a certain small range and drives the back pressure plate to move, thereby facilitating mud discharge.

[0022] Optionally, a sealing plate group for limiting the reversing mechanism is provided on both of the central shafts.

[0023] By adopting the above technical solution, under the action of the sealing plate group, the reverse driving mechanism at the corresponding position can be limited, thereby improving the stability of its connection to the central axis.

[0024] Optionally, a screw group is provided on the docking plate, and the screw group passes through the docking plate and is used to connect with the reverse drive mechanism.

[0025] By adopting the above technical solution, the docking plate and the reverse driving mechanism are connected by a screw group, thereby realizing the connection between the back plate and the reverse driving mechanism, and the connection is convenient and the structure is simple.

[0026] In summary, the present application includes at least one of the following beneficial effects: 1. The reverse drive mechanism drives the back pressure plate and the connected spiral shaft to rotate in opposite directions. The reverse spiral blades can discharge materials in the reverse direction at the position of the smooth section, thus solving the problem of sludge material blockage; 2. There is a gap between the reverse spiral blades and the spiral shaft blades of the spiral shaft, so that during the discharging process, a mud wall can be formed at the position of the gap, thereby effectively reducing the reverse mud flow; 3. By setting a diverter pin, which extends to the position of the smooth section, the compaction of the mud can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application; Figure 2 is an exploded schematic diagram of an embodiment of the present application; Figure 3 is a schematic diagram of a reverse driving mechanism when two spiral shafts rotate in reverse directions in an embodiment of the present application; Figure 4 This is a schematic diagram of the structure of the back pressure plate when the spiral shaft has equal diameters; Figure 5 is a schematic diagram of a reverse spiral blade in an embodiment of the present application; Figure 6 is a schematic diagram of a reverse driving mechanism when two spiral shafts rotate in the same direction in an embodiment of the present application; Figure 7 It is a schematic diagram of an explosion when two spiral shafts rotate in the same direction in an embodiment of the present application.

[0028] Explanation of the reference numerals: 1. spiral shaft; 2. mud discharge box; 3. back pressure plate; 4. reverse drive mechanism; 41. rotating cylinder; 42. linkage gear; 43. synchronizer; 44. first gear; 45. second gear; 46. third gear; 5. mud outlet hole; 6. smooth section; 7. reverse spiral blade; 8. mud pressing section; 9. diverter pin; 10. sleeve; 11. docking plate; 12. elastic member; 13. sealing plate group; 14. meshing gear; 15. central shaft; 16. power shaft; 17. spiral blade; 18. conical spiral shaft structure; 19. back pressure plate group. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with the accompanying drawings.

[0030] The present application embodiment discloses a filtering mechanism with double-direction spiral rotation and unidirectional material pushing. Figure 1 and Figure 2 The filtering mechanism of this embodiment includes a spiral shaft 1, a mud discharge box 2 for discharging mud, and a back pressure plate group 19, and also includes a reverse driving mechanism 4 installed between the spiral shaft 1 and the back pressure plate 3. The back pressure plate group 19 includes a back pressure plate 3 and a reverse spiral blade 7 installed on the back pressure plate 3. The spiral shaft 1 passes through the filter cavity of the solid-liquid separation equipment, and the mud discharge box 2 is located at the discharge end of the filter cavity. The spiral shaft 1 includes a central shaft 15 and a spiral blade 17, and one end of the central shaft 15 passes through the mud discharge box 2 and is connected to an external driving source, so that the rotation of the central shaft 15 drives the spiral blade 17 to rotate synchronously, thereby pushing the material. The back pressure plate 3 is located in the mud discharge box 2, and the back pressure plate 3 is sleeved on the central shaft 15. The reverse driving mechanism 4 is used to drive the back pressure plate 3 and the spiral shaft 1 to rotate in the opposite direction.

[0031] The mud discharge box 2 is an internal hollow structure, and the central axis 15 passes through the mud discharge box 2, and partially extends out of the surface of the mud discharge box 2 for connection with an external driving source. The driving source can be a device such as a motor, which can drive the rotation of the spiral shaft 1. The motor is not shown in the figure. This is a prior art and is not the focus of this application. It will not be described in detail here. A mud discharge hole 5 is provided on the side wall of the mud discharge box 2. The spiral shaft 1 pushes the sludge material forward and continuously discharges liquid. The sludge after water filtration is discharged from the mud discharge hole 5. The back pressure plate 3 is located inside the mud discharge box 2 and is sleeved on the central axis 15. There is a certain gap between the back pressure plate 3 and the mud discharge hole 5 when discharging. Finally, the mud after solid-liquid separation is discharged from the gap and falls downward.

[0032] Reference Figure 2 and Figure 3 The end of the central shaft 15 has no spiral blade 17, forming a smooth section 6, and part of the smooth section 6 is located in the filter cavity. Figure 4 , the 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 cavity. The spiral directions of the reverse spiral blade 7 and the spiral shaft blade 17 are opposite, and 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 mud after water filtration to the position of the discharge end, the reverse spiral blade 7 can push the material from the reverse direction to discharge the mud from the mud outlet hole 5. Discharging by the reverse spiral blade 7 alleviates the blockage during the end discharge, and the reverse spiral blade 7 can scrape off the mud blocks on the surface of the smooth section 6 at the discharge end, avoiding the situation where the center axis 15 is close to the discharge section and is difficult to clean.

[0033] The spiral shaft 1 can be one or two, refer to Figure 2 and Figure 3 First, the two spiral shafts 1 are used for explanation. The two spiral shafts 1 can rotate in the same direction or in opposite directions. Back pressure plates 3 are installed on the two spiral shafts 1, and the mud outlet holes 5 are in a gourd-shaped structure and correspond to the spiral shafts 1 one by one. The reverse driving mechanism 4 is used to drive the back pressure plates 3 on the two spiral shafts 1 to rotate in the opposite direction to the corresponding spiral shafts 1. The reverse driving mechanism 4 can use one of the spiral shafts 1 as power to drive the back pressure plate 3 to rotate, or connect to an external power source to drive the back pressure plate 3 to rotate.

[0034] 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 as follows: the diameter of the central shaft 15 gradually increases to form a conical structure, and 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 and the distance between them approaches zero.

[0035] Due to the existence of the conical spiral structure 18, a stepped structure can be formed at the end of the conical spiral structure 18 and the central axis 15, and the smooth section 6 corresponds to the stepped position, and the reverse 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, and the back pressure plate 3 can be set as two circular plate structures, and the two back pressure plates 3 are arranged side by side and the distance between them is zero, that is, the two back pressure plates 3 are close to contacting each other, and the back pressure plates 3 can correspond to the positions of the mud outlet 5 respectively, and the back pressure plates 3 will not affect each other's rotation.

[0036] In other embodiments, refer to Figure 4 , the spiral shaft 1 is of equal diameter, that is, the diameter of the central shaft 15 does not change. 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. At this time, the size of the mud outlet hole 5 needs to correspond to the size of the spiral shaft blade 17. Therefore, in this case, the back pressure plate 3 selects an elliptical or eccentric plate-shaped structure. When the adjacent back pressure plates 3 rotate, the spacing tends to zero and is always 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 after the other, and there are overlapping parts.

[0037] Reference Figure 2 and Figure 3There is a spacing 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 spacing 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 material to the smooth section 6, a mud wall can be formed at the position of the spacing, which is conducive to slowing down the reverse mud running of the material and reducing the blockage at the discharge end. The end of the spiral shaft 1 has a mud pressing section 8, which is a hollow shell-like structure. The mud pressing section 8 is a part of the filter cavity of the water filtration equipment. 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.

[0038] The filtering mechanism also includes a diverter pin 9, which passes through the mud pressing section 8 and extends to the surface of the smooth section 6, and the diverter pin 9 is correspondingly located in the gap between the reverse spiral leaf 7 and the spiral shaft leaf 17, so as not to affect the rotation of the reverse spiral leaf 7. Under the action of the diverter pin 9, the mud can be separated by the diverter pin 9 during movement, thereby reducing the situation of mud compaction. The diverter pin 9 can be tilted at a certain angle, so that it can cooperate with the spiral shaft leaf to push the material together.

[0039] Reference Figure 3 and Figure 5 The back pressure plate group 19 also includes a sleeve 10 connected to the back pressure plate 3. The sleeve 10 is slidably mounted on the central axis 15 and can rotate on the outer wall of the central axis 15. The outer wall of one end of the sleeve 10 away from the back pressure plate 3 is coaxially fixed with a docking disk 11. The back pressure plate 3 is connected to the reverse drive mechanism 4 through the docking disk 11.

[0040] Reference Figure 2 and Figure 3 First, when the two screw shafts 1 rotate in opposite directions, the reverse driving mechanism 4 can use one of the central shafts 15 as a power source and combine with sprocket gears to achieve the effect of reverse rotation of each central shaft 15 and the back pressure plate 3.

[0041] The end of one of the central shafts 15 is connected to an external motor, and meshing gears 14 are installed on the outer walls of the two central shafts 15. The two meshing gears 14 mesh with each other, so that the rotation of one of the central shafts 15 drives the other central shaft 15 to rotate in the opposite direction. In this case, the two spiral shafts 1 rotate in the opposite direction.

[0042] When the two spiral shafts 1 rotate in opposite directions, the reverse driving mechanism 4 uses one of the central shafts 15 as a power source to drive the back pressure plate 3 and the spiral shaft 1 to rotate in opposite directions. The reverse driving 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 synchronous member 43 installed between the rotating cylinder 41 and the other central shaft 15. The two linkage gears 42 are meshed with each other, wherein one linkage gear 42 is coaxially fixed to the outer wall of the rotating cylinder 41, and the other linkage gear 42 is rotationally connected to the side wall of the other central shaft 15 by means of a bearing. The docking disk 11 is respectively connected to adjacent linkage gears 42, and the linkage gears 42 rotate synchronously to drive the docking disk 11 to rotate. The synchronous member 43 is used to drive the rotating cylinder 41 and the other central shaft 15 to rotate in the same direction, and the synchronous member 43 can be a sprocket chain installed between the rotating cylinder 41 and the central shaft 15.

[0043] Therefore, when the two screw shafts 1 rotate in opposite directions, under the action of the synchronizer 43, the rotation direction of the rotating cylinder 41 and the central shaft 15 connected to the rotating cylinder 41 are opposite, while the rotation direction of the back pressure plate 3 connected to the rotating cylinder 41 is the same as that of the rotating cylinder 41; and the two linkage gears 42 are meshed, so that the rotation direction of the other linkage gear 42 is opposite to that of the rotating cylinder 41. Therefore, under the cooperation of the synchronizer 43, the rotating cylinder 41 and the linkage gear 42, the rotation direction of the two back pressure plates 3 is opposite to the rotation direction of the screw shafts 1 connected to them.

[0044] Reference Figure 3 and Figure 5 An elastic member 12 is installed between the docking plate 11 and the adjacent linkage gear 42. The elastic member 12 is sleeved on the outer wall of the central shaft 15. The elasticity can be selected from a spring or a spring. In this embodiment, the elastic member 12 is selected from a spring. A plurality of screw groups are provided on the docking plate 11. The screw group includes a plurality of screws, and the ends of the screws pass through the docking plate and are threadedly connected to the linkage gear 42. Therefore, when the linkage gear 42 rotates, the docking plate 11 can be driven to rotate synchronously, and when the mud outlet hole 5 is discharging mud, the back pressure plate 3 can be pushed to move in the direction of the linkage gear 42 to a certain extent, and the elastic member 12 is compressed.

[0045] Furthermore, in order to improve the stability of the linkage gear 42 and the rotating cylinder 41, a sealing plate group 13 is installed on the central shaft 15 on which the rotating cylinder 41 is installed. The sealing plate group 13 is fixedly installed on the outer wall of the central shaft 15, and the sealing plate group 13 cannot slip on the central shaft 15. One end of the rotating cylinder 41 abuts against the sealing plate group 13, so that the rotating cylinder 41 is not easily offset, thereby improving the stability of the rotating cylinder 41. A sealing plate group 13 is also installed on the other central shaft 15, and is used to cooperate with the linkage gear 42 on the central shaft 15 to limit the slippage of the linkage gear 42 on the central shaft 15.

[0046] When the two screw shafts 1 rotate in opposite directions, and the reverse driving mechanism 4 drives the two back pressure plates 3 and the screw shaft 1 to rotate in opposite directions by means of an external power source, in this case, the two linkage gears 42 are respectively connected to the outer walls of the two central shafts 15 and are connected to the docking plate 11. A driving shaft is installed on the mud discharge box 2, and two driving shafts are provided. Gears are coaxially fixed to the side walls of the driving shafts, and the gears are respectively meshed with the linkage gears 42, so that the corresponding back pressure plates 3 are driven to rotate in opposite directions through the one-to-one corresponding driving shafts, which are not shown in the figure.

[0047] Reference Figure 6 and Figure 7 When the two spiral shafts 1 rotate in the same direction, the two spiral shafts 1 can rotate in the same direction by means of three gears, or can rotate synchronously by means of chains and sprockets.

[0048] When the screw shafts 1 rotate in the same direction, the reverse driving mechanism 4 uses one of the screw shafts 1 or an external power source as power and combines with a gear set to drive the back pressure plate 3 and the screw shaft 1 to rotate in the opposite direction.

[0049] In this case, the reverse drive mechanism 4 includes two first gears 44 respectively connected to the outer wall of the screw shaft 1, and a second gear 45 meshing with the two first gears 44 at the same time. 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 rotation directions of the first gear 44 and the second gear 45 are opposite, and it is only necessary to make the second gear 45 and the screw shaft 1 rotate in the same direction. The power source of the drive shaft 16 can be connected to an external motor, or it can be connected between the drive shaft 16 and one of the central shafts 15 in a synchronous belt to drive the synchronous rotation of the drive shaft 16. In this case, not only a synchronous chain can be used, but also a transmission can be carried out by cooperating with multiple gears, so that the second gear 45 and the central shaft 15 can rotate in the same direction.

[0050] The docking plates 11 are respectively connected to the adjacent first gears 44, and the elastic member 12 is connected between the docking plates 11 and the first gears 44. In this case, the sealing plate set 13 is connected to the first gear 44 to limit the first gear 44 from deflecting.

[0051] In addition, according to the installation conditions of the device, the second gear 45 can be driven to rotate by an external driving source, and the rotation direction of the second gear 45 is kept the same as the rotation direction of the central shaft 15. Figure 6By setting up a third gear 46, the third gear 46 is meshed with the second gear 45, and the third gear 46 is driven by an externally connected motor to rotate, and the rotation direction is opposite to the central shaft 15. This method can also drive the first gear 44 and the central shaft 15 to rotate in the opposite direction.

[0052] Therefore, driven by the first gear 44 and the second gear 45, the rotation direction of the back pressure plate 3 is opposite to the rotation direction of the screw shaft 1. The second gear 45 can be directly rotated by the central shaft 15, or driven by an external power source, which can be selected according to the situation.

[0053] In addition, when there is only one spiral shaft 1 (not shown in the figure), the docking plate 11 is connected to the first gear 44, and the reverse driving mechanism 4 only includes the first gear 44 rotatably mounted on the central shaft 15 and the second gear 45 meshing with the first gear 45, and the second gear 45 is connected to the driving shaft 16, and the second gear 45 rotates to drive the first gear 44 and the spiral shaft 1 to rotate in the opposite direction. At this time, the driving shaft 16 can still be connected to an external power source or use one of the central shafts 15 as a power source.

[0054] The implementation principle of a filtering mechanism with double-direction spiral rotation and unidirectional pushing in the embodiment of the present application is as follows: the reverse driving mechanism 4 drives the back pressure plate 3 and the connected spiral shaft 1 to rotate in opposite directions, and the reverse spiral blades 7 can discharge in the reverse 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 running, and reducing the occurrence of mud blocks adhering to the surface of the smooth section 6.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A filtering mechanism with double-direction spiral rotation and unidirectional material pushing, characterized in that: include: A spiral shaft, the spiral shaft runs through the filter cavity, the spiral shaft comprises a central shaft and spiral blades, and the end of the central shaft has no spiral blades, forming a smooth section; A mud discharge box, the mud discharge box is located at the discharge end of the filter cavity, the mud discharge box is provided with a mud discharge hole, and the smooth section passes through the mud discharge hole; A back pressure plate group, the back pressure plate group comprising a back pressure plate and a reverse spiral blade arranged on the back pressure plate, the spiral direction of the reverse spiral blade is opposite to the spiral direction of the spiral blade, and the reverse spiral blade is 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 axis, so that the reverse spiral blade receives the material conveyed by the spiral blade and continues to convey it toward the discharge end.

2. A filtering mechanism with double-direction spiral rotation and unidirectional material pushing according to claim 1, characterized in that: There are two spiral shafts, and the spiral blades of two adjacent spiral shafts are staggered and interlocked with each other; A conical spiral shaft structure is provided at the end of the spiral shaft, and the conical spiral shaft structure is located in the filter chamber. From the feed end to the discharge end of the filter chamber, the conical spiral shaft structure is as follows: the diameter of the central axis gradually increases to form a conical structure, and the shaft diameter of the spiral blades arranged 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 and the distance between them approaches zero.

3. A filtering mechanism with double-direction spiral rotation and unidirectional material pushing according to claim 1, characterized in that: There are two spiral shafts, and the spiral blades of two adjacent spiral shafts are staggered and interlocked with each other; when the shaft 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 spacing tends to zero and is always equal.

4. A filtering mechanism with double-direction spiral rotation and unidirectional material pushing according to any one of claims 2 or 3, characterized in that: The reverse driving mechanism uses one of the screw shafts or an external driving source as a driving force to drive the back pressure plate and the corresponding screw shaft to rotate in opposite directions.

5. A filtering mechanism with double-direction spiral rotation and unidirectional material pushing according to claim 1, characterized in that: A distance is left between one end of the reverse spiral blade away from the back pressure plate and the end of the spiral shaft blade.

6. A filtering mechanism with double-direction spiral rotation and unidirectional material pushing according to claim 5, characterized in that: It also includes a diverter pin, which is arranged in the gap between the spiral blade and the reverse spiral blade and is used to scrape off the material on the central shaft.

7. A filtering mechanism with double-direction spiral rotation and unidirectional material pushing according to claim 2, characterized in that: The back pressure plate assembly further comprises a sleeve connected to the back pressure plate, and a docking plate connected to the sleeve, and the back pressure plate is connected to the reverse driving mechanism via the docking plate.

8. A filtering mechanism with double-direction spiral rotation and unidirectional material pushing according to claim 7, characterized in that: An elastic member is connected between the docking plate and the reverse driving mechanism.

9. A filtering mechanism with double-direction spiral rotation and unidirectional material pushing according to claim 7, characterized in that: The two central shafts are both provided with sealing plate groups for limiting the reverse driving mechanism.

10. A filtering mechanism with double-direction spiral rotation and unidirectional material pushing according to claim 7, characterized in that: The docking plate is provided with a screw group, which passes through the docking plate and is used to connect with the reverse driving mechanism.

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