Multi-stage shearing anti-blocking sludge conveying system

Abstract

The invention provides a multi-stage shearing anti-blocking sludge conveying system which comprises a sludge conveying pipe and a spiral propeller, an electromagnetic coil is wound on the outer wall of the sludge conveying pipe, the electromagnetic coil is made of a high-temperature-resistant and corrosion-resistant enameled copper flat wire, and the electromagnetic coil is spirally wound in the axial direction of the sludge conveying pipe by adopting a multi-layer close winding method. When sludge passes through the expansion section, the flow velocity is slowed down, and after block masses are dispersed due to inertia and enter the contraction section, the pipe diameter suddenly contracts, the flow velocity is increased, and the pressure generated by the high rotating speed of the spiral blade and the pipe diameter change suddenly increases, a strong composite stress field is formed, and the sludge is subjected to compression-release circulating operation at high frequency; due to the asymmetric design of the rhombic convex lines on the inner wall of the contraction section and the forward inclination of the spiral blades, the scraping and disturbing effects on the sludge are further enhanced, the sludge is effectively prevented from being adhered and blocked in the pipeline, and the smoothness and efficiency of sludge conveying are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sludge treatment, and more specifically, relates to a multi-stage shearing and anti-blocking sludge conveying system. Background Art

[0002] During the sludge treatment process, a sludge screw feeder is usually used to transport the sludge in the material pool upward to the sludge drying equipment, and then the sludge drying equipment is used to remove moisture to reduce the sludge.

[0003] Existing sludge screw feeders are prone to sludge sticking during sludge conveying, which can easily cause blockage within the conveying device. This not only increases the energy consumption of the sludge conveying device, but also brings great inconvenience to the daily cleaning of the conveying device. Therefore, in view of this, we have studied and improved the existing structure and shortcomings, and provided a multi-stage shearing and anti-blocking sludge conveying system. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a multi-stage shearing and anti-blocking sludge conveying system, which is achieved by the following specific technical means:

[0005] A multi-stage shearing and anti-blocking sludge conveying system includes a sludge conveying pipe and a spiral propeller. The outer wall of the sludge conveying pipe is wound with an electromagnetic coil. The material of the electromagnetic coil is high-temperature resistant and corrosion-resistant enameled copper flat wire. The electromagnetic coil adopts a multi-layer dense winding method and is spirally wound along the axial direction of the sludge conveying pipe. The interlayer of the electromagnetic coil is filled with insulating thermal conductive glue. The insulating thermal conductive glue is silicone rubber. The sludge conveying pipe consists of stable sections at both ends and multiple diameter-changing units located in the middle. The stable section is a circular tube structure. The diameter-changing units are arranged in sequence along the axial direction of the sludge conveying pipe. Each diameter-changing unit consists of an expansion section and a contraction section, and the multiple diameter-changing units are in a contraction section-expansion section arrangement. They are arranged alternately, the cone angle of the expansion section is 15°-20°, the cone angle of the contraction section is 25°-30°, the spacing between adjacent variable-diameter units is 3-5 times the diameter of the sludge conveying pipe, the screw propeller includes a shaft and spiral blades, the screw propeller is located inside the sludge conveying pipe, the spiral blades are fixedly mounted on the shaft, the spiral blades adopt an asymmetric design with a forward tilt of 12°-15°, the pitch of the spiral blades increases by 10%-15% in the expansion section, and decreases by 8%-12% in the contraction section, the inner wall of the contraction section is provided with diamond convex patterns, the height of the diamond convex patterns is 0.8-1.2mm, and an embedded microwave moisture content sensor is installed on the sludge conveying pipe.

[0006] Furthermore, the two ends of the sludge conveying pipe are respectively fixedly installed with connection part one and connection part two, the upper end of the connection part one is fixedly installed with a sludge feed pipe, and the bottom of the connection part two is fixedly installed with a sludge discharge pipe, and the surfaces of the connection part one and the connection part two are both provided with annular grooves.

[0007] Furthermore, a motor is fixedly mounted on the connecting part 1, a driving gear is fixedly mounted on the output shaft of the motor, both ends of the shaft body are rotationally connected to the connecting part 1 and the connecting part 2 respectively, and the output shaft of the motor is fixedly connected to the shaft body.

[0008] Furthermore, a connecting rod is fixedly mounted on the connecting portion, a rotating shaft is rotatably mounted on the connecting rod, a driven gear is fixedly mounted on the rotating shaft, and the driving gear is meshed with the driven gear.

[0009] Furthermore, a cooling fan is rotatably mounted on the connecting rod, a second bevel gear is fixedly mounted on the shaft end of the cooling fan, a first bevel gear is fixedly mounted on the rotating shaft, and the first bevel gear is meshed with the second bevel gear.

[0010] Furthermore, a protective assembly is provided on the outer side of the sludge conveying pipe, and the protective assembly includes two semicircular protective tubes, and two raised rings are fixedly installed at the opposite ends of the two semicircular protective tubes, each of the raised rings is inserted into the annular groove respectively, and the inner wall of each semicircular protective tube is in contact with the outer surface of the connecting part one and the connecting part two.

[0011] Furthermore, a fixing ring is fixedly installed on the outer wall of each semicircular protective tube, a bolt is rotatably screwed into the fixing ring on the upper side, and the fixing ring on the upper side is threadedly fixed to the fixing ring on the lower side through the bolt.

[0012] Furthermore, a number of reinforcement blocks are fixedly installed on both sides of the inner wall of each semicircular protective tube, the reinforcement block on the upper side is fitted with the end of the reinforcement block on the lower side, and a support rod is fixedly installed at the bottom end of the fixing ring on the lower side.

[0013] Furthermore, an extension portion is fixedly installed on each of the semicircular protective tubes, each of the extension portions is respectively communicated with the interior of the semicircular protective tube, a dustproof net is fixedly installed at the port of each of the extension portions, the two extension portions form a semi-enclosed structure, and the cooling fan is located in the semi-enclosed structure.

[0014] Furthermore, a heat dissipation opening is provided on the bottom surface of the semicircular protective tube at the lower side, and a second dustproof net is embedded in the heat dissipation opening.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The variable diameter unit inside the sludge conveying pipe is composed of alternating expansion sections and contraction sections. Combined with the variable pitch design of the spiral propeller, it can produce strong shearing and squeezing effects on the sludge. When the sludge passes through the expansion section, the flow rate slows down and the agglomerates are dispersed due to inertia. After entering the contraction section, the pipe diameter shrinks suddenly and the flow rate accelerates. The high speed of the spiral blades and the pressure surge caused by the change in pipe diameter form a powerful composite stress field, which performs a "compression-release" cycle operation on the sludge at a high frequency. At the same time, the diamond-shaped convex pattern on the inner wall of the contraction section and the asymmetric design of the forward-leaning spiral blades further enhance the scraping and disturbance effect on the sludge, effectively preventing sludge from adhering to and clogging the pipeline, improving the smoothness and efficiency of sludge transportation, ensuring long-term stable operation, and avoiding downtime and maintenance due to blockage.

[0017] 2. The electromagnetic coil wrapped around the outer wall of the sludge conveying pipe is made of enameled copper flat wire of special material, and is filled with silicone rubber insulation and thermal conductive adhesive through a multi-layer dense winding method. It not only ensures the stable operation of the electromagnetic coil, but also generates a high-frequency pulse magnetic field. This magnetic field acts on the sludge, causing the water molecules in it to produce polarity oscillations, reducing the surface tension and viscosity of the sludge, further assisting the transportation and treatment of the sludge, and reducing the adhesion and accumulation of sludge in the pipeline. At the same time, it also helps to improve the sludge crushing effect, so that the sludge can be more fully pre-treated during the transportation process, laying a good foundation for subsequent treatment procedures.

[0018] 3. The embedded microwave moisture content sensor monitors the fluidity and adhesion of the sludge in real time. The system dynamically adjusts the spiral speed and electromagnetic field strength based on this data, enabling the system to automatically optimize operating parameters according to the actual state of the sludge and always maintain the best working state. This not only improves the quality of sludge treatment, but also avoids energy waste and equipment loss caused by improper parameter settings, achieving an efficient and energy-saving operation mode.

[0019] 4. The motor provides stable power to the propeller through a reasonable gear transmission structure. At the same time, the rotation of the motor output shaft drives the cooling fan. The cooling fan adopts an exhaust method to quickly take away the heat generated by the electromagnetic coil, ensuring that the electromagnetic coil is always in a suitable temperature range during long-term operation, extending the service life of the electromagnetic coil and improving the reliability and stability of the system.

[0020] 5. The annular grooves on the surfaces of connection part 1 and connection part 2 cooperate with the raised rings at both ends of the semicircular protective tube to realize the installation of the protective component. The two semicircular protective tubes form a protective component, which is fixed by a fixing ring and bolts. The support rod at the bottom end of the lower fixing ring supports the sludge conveying pipe. The protective component protects the electromagnetic coil to prevent external objects from damaging the electromagnetic coil. Dustproof net 1 and dustproof net 2 prevent external dust from covering the electromagnetic coil to ensure stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the sludge conveying pipe of the present invention.

[0022] Figure 2 Schematic diagram of the semicircular protective tube of the present invention.

[0023] Figure 3 Schematic diagram of the connecting portion 1 of the present invention.

[0024] Figure 4 It is a schematic diagram of a sludge conveying pipe of the present invention when it is cut apart.

[0025] Figure 5 Schematic diagram of the shaft of the present invention.

[0026] Figure 6 Schematic diagram of the extension portion of the present invention.

[0027] Figure 7 Schematic diagram of the second dustproof net of the present invention.

[0028] Figure 8 This invention Figure 3 Schematic diagram of the enlarged view at point A.

[0029] In the figure, the corresponding relationship between the component names and the drawing numbers is as follows:

[0030] 1. Sludge conveying pipe; 11. Expansion section; 12. Contraction section; 13. Stabilization section; 2. Shaft; 21. Spiral blade; 3. Electromagnetic coil; 4. Connection part 1; 41. Sludge feed pipe; 5. Connection part 2; 51. Sludge discharge pipe; 52. Annular groove; 6. Motor; 61. Driving gear; 7. Connecting rod; 71. Driven gear; 72. Rotating shaft; 73. Bevel gear 1; 74. Cooling fan; 75. Bevel gear 2; 8. Semicircular protective tube; 81. Extension; 82. Dust screen 1; 83. Raised ring; 84. Fixing ring; 85. Bolt; 86. Reinforcement block; 87. Support rod; 9. Dust screen 2. DETAILED DESCRIPTION

[0031] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0034] Example:

[0035] As attached Figure 1 To the attached Figure 8 As shown:

[0036] The present invention provides a multi-stage shearing and anti-blocking sludge conveying system, comprising a sludge conveying pipe 1 and a spiral propeller. The outer wall of the sludge conveying pipe 1 is wound with an electromagnetic coil 3. The electromagnetic coil 3 is made of high-temperature-resistant and corrosion-resistant enameled copper rectangular wire. The electromagnetic coil 3 is wound spirally along the axial direction of the sludge conveying pipe 1 using a multi-layer dense winding method. The interlayers of the electromagnetic coil 3 are filled with an insulating thermally conductive adhesive, which is silicone rubber. The electromagnetic coil 3 generates a high-frequency pulse magnetic field of 1-5 kHz. Under the action of the magnetic field, the water molecules in the sludge in the conveying pipe produce polarity oscillations, reducing surface tension, further weakening the viscosity of the sludge, and preventing the sludge from adhering to the wall.

[0037] The sludge conveying pipe 1 is composed of a stable section 13 at both ends and a plurality of variable diameter units in the middle. The stable section 13 is a circular tube structure. The variable diameter units are arranged in sequence along the axial direction of the sludge conveying pipe 1. Each variable diameter unit is composed of an expansion section 11 and a contraction section 12. The plurality of variable diameter units are alternately arranged in a contraction section 12-expansion section 11. The cone angle of the expansion section 11 is 15°-20°, and the cone angle of the contraction section 12 is 25°-30°. The distance between adjacent variable diameter units is 3-5 times the diameter of the sludge conveying pipe 1. The spiral push The propeller includes a shaft 2 and a spiral blade 21. The spiral propeller is located inside the sludge conveying pipe 1. The spiral blade 21 is fixedly mounted on the shaft 2. The spiral blade 21 adopts an asymmetric design with a forward tilt of 12°-15°. The pitch of the spiral blade 21 increases by 10%-15% in the expansion section 11 and decreases by 8%-12% in the contraction section 12. The inner wall of the contraction section 12 is provided with a diamond convex pattern with a height of 0.8-1.2mm. The spiral blade 21 of the spiral propeller adopts a forward tilt of 12°-1 The 5° asymmetric design, combined with the 0.8-1.2mm high diamond-shaped convex pattern on the inner wall of the contraction section 12, forms axial scraping and eddy current disturbance during propulsion, stripping off the sludge attached to the pipe wall to prevent blockage. The sludge passes through the variable diameter unit composed of the expansion section 11 and the contraction section 12 alternately. The cone angle of the expansion section 11 is 15°-20°, and the cone angle of the contraction section 12 is 25°-30°. The spacing between adjacent variable diameter units is 3-5 times the pipe diameter. The pitch of the spiral blade 21 increases by 10%-15% in the expansion section 11, slowing down the flow of the pipe. The propulsion speed causes the sludge flow rate to drop sharply by 30%-40%. The agglomerates are dispersed due to inertia. The pitch of the screw is reduced by 8%-12% in the contraction section 12, and the speed is increased by 20%-25%. The pressure surge caused by the sudden contraction of the pipe diameter and the tangential shear force generated by the high speed of the spiral blade 21 form a composite stress field, which "compresses and releases" the sludge in a cycle at a frequency of 1-3 Hz. After passing through multiple diameter-changing units, more than 95% of the sludge agglomerates are broken into particles of ≤5 mm and finally discharged from the sludge discharge pipe 51.

[0038] An embedded microwave moisture content sensor is installed on the sludge conveying pipe 1 to monitor the fluidity and adhesion of the sludge in real time during transportation. Based on the monitoring data, the screw speed of the propeller and the electromagnetic field strength of the electromagnetic coil 3 are adjusted to ensure the transportation efficiency of the sludge during transportation and match the optimal transportation parameters.

[0039] The two ends of the sludge conveying pipe 1 are respectively fixedly installed with a connecting part 1 4 and a connecting part 2 5. The upper end of the connecting part 1 4 is fixedly installed with a sludge feeding pipe 41, and the bottom of the connecting part 2 5 is fixedly installed with a sludge discharging pipe 51 for the inlet and outlet of sludge.

[0040] A motor 6 is fixedly mounted on the connecting part 1 4, and a driving gear 61 is fixedly mounted on the output shaft of the motor 6. The two ends of the shaft body 2 are rotatably connected to the connecting part 1 4 and the connecting part 2 5 respectively. The output shaft of the motor 6 is fixedly connected to the shaft body 2. A connecting rod 7 is fixedly mounted on the connecting part 1 4. A rotating shaft 72 is rotatably mounted on the connecting rod 7. A driven gear 71 is fixedly mounted on the rotating shaft 72. The driving gear 61 meshes with the driven gear 71. A cooling fan 74 is rotatably mounted on the connecting rod 7. A bevel gear 2 75 is fixedly mounted on the shaft end of the cooling fan 74. A bevel gear 1 73 is fixedly mounted on the rotating shaft 72. The bevel gear 1 73 meshes with the bevel gear 2 75. The motor 6 provides power for the propeller and the cooling fan 74. The cooling fan 74 is operated to discharge the heat generated when the electromagnetic coil 3 is working, to ensure that the electromagnetic coil 3 is at a suitable working temperature, thereby ensuring its stable performance and service life.

[0041] The outer side of the sludge conveying pipe 1 is provided with a protective assembly, which includes two semicircular protective tubes 8, two raised rings 83 are fixedly installed at opposite ends of the two semicircular protective tubes 8, and an annular groove 52 is provided on the surface of the connecting part 1 4 and the connecting part 2 5. Each raised ring 83 is inserted into the annular groove 52 respectively. The inner wall of each semicircular protective tube 8 is in contact with the outer surface of the connecting part 1 4 and the connecting part 2 5. A fixing ring 84 is fixedly installed on the outer wall of each semicircular protective tube 8. A bolt 85 is rotatably twisted into the fixing ring 84 on the upper side. The fixing ring 84 on the upper side is threadedly fixed to the fixing ring 84 on the lower side by the bolt 85. The two semicircular protective tubes 8 are fixed to each other for protecting the sludge conveying pipe 1 and the electromagnetic coil 3.

[0042] A plurality of reinforcement blocks 86 are fixedly installed on both sides of the inner wall of each semicircular protective tube 8, and the reinforcement block 86 on the upper side fits in with the end of the reinforcement block 86 on the lower side. A support rod 87 is fixedly installed at the bottom end of the fixing ring 84 on the lower side. The support rod 87 is used to support the sludge conveying pipe 1. The ends of the upper and lower reinforcement blocks 86 fit in, which plays a role in reinforcing the two semicircular protective tubes 8;

[0043] An extension portion 81 is fixedly mounted on each semicircular protective tube 8. Each extension portion 81 communicates with the interior of the semicircular protective tube 8. The two extension portions 81 form a semi-enclosed structure. The cooling fan 74 is located within the semi-enclosed structure, which protects the cooling fan 74 from collision damage.

[0044] A dustproof net 82 is fixedly installed at the port of each extension part 81, and a heat dissipation vent is opened on the bottom surface of the semicircular protective tube 8 on the lower side, and a dustproof net 9 is embedded in the heat dissipation vent. The dustproof net 82 and the dustproof net 9 prevent external dust from covering the electromagnetic coil 3, ensuring stable operation.

[0045] The working principle of this embodiment is as follows:

[0046] Step 1: The sludge enters the system from the sludge feed pipe 41 and moves along the sludge conveying pipe 1 under the action of the spiral propeller. The spiral blade 21 of the spiral propeller adopts an asymmetric design with a forward tilt of 12°-15°, and cooperates with the diamond-shaped convex pattern of 0.8-1.2mm high on the inner wall of the contraction section 12. During the propulsion, axial scraping and eddy current disturbance are formed to peel off the sludge attached to the pipe wall to prevent blockage. The sludge passes through the variable diameter unit composed of the alternating expansion section 11 and the contraction section 12 in turn. The cone angle of the expansion section 11 is 15°-20°, and the cone angle of the contraction section 12 is 25°-30°. The distance between adjacent variable diameter units is 3 pipe diameters. -5 times, the pitch of the spiral blade 21 increases by 10%-15% in the expansion section 11, slowing down the propulsion speed and causing the sludge flow rate to drop sharply by 30%-40%. Due to inertia, the agglomerates are dispersed, and the pitch is reduced by 8%-12% in the contraction section 12, while the rotation speed is increased by 20%-25%. The pressure surge caused by the sudden contraction of the pipe diameter and the tangential shear force generated by the high rotation speed of the spiral blade 21 form a composite stress field, which performs a "compression-release" cycle on the sludge at a frequency of 1-3 Hz. After passing through multiple diameter-changing units, more than 95% of the sludge agglomerates are broken into particles ≤5 mm and finally discharged from the sludge discharge pipe 51;

[0047] Step 2: The electromagnetic coil 3 is wound around the outer wall of the sludge conveying pipe 1. It is made of high-temperature resistant and corrosion-resistant enameled copper flat wire. It is spirally wound along the axial direction through a multi-layer dense winding method. The interlayers are filled with silicone rubber insulation and thermal conductive adhesive. The electromagnetic coil 3 generates a high-frequency pulse magnetic field of 1-5kHz. Under the action of the magnetic field, the water molecules in the sludge in the conveying pipe produce polarity oscillation, reducing surface tension, further weakening the viscosity of the sludge, preventing sludge from adhering to the wall, and assisting in sludge transportation and treatment.

[0048] Step 3: The embedded microwave moisture content sensor installed on the sludge conveying pipe 1 monitors the fluidity and adhesion of the sludge during transportation in real time. Based on the monitoring data, the system automatically and dynamically adjusts the screw speed of the propeller and the electromagnetic field strength of the electromagnetic coil 3 to ensure the conveying efficiency of the sludge during transportation and match the optimal conveying parameters;

[0049] Step 4: The motor 6 on the connecting part 4 provides power for the propeller. The output shaft of the motor 6 is fixedly installed with a driving gear 61, which meshes with the driven gear 71 on the shaft body 2, driving the shaft body 2 and the spiral blade 21 to rotate. At the same time, the output shaft of the motor 6 rotates and drives the cooling fan 74 to rotate through a series of transmission structures. When the output shaft of the motor 6 rotates, it drives the bevel gear 1 73 on the rotating shaft 72 to rotate, and the bevel gear 2 75 meshing with the bevel gear 1 73 drives the shaft end of the cooling fan 74 to rotate, so that the cooling fan 74 is running. The cooling fan 74 is located in a semi-enclosed structure formed by two extensions 81. The heat generated by the electromagnetic coil 3 when it is working is extracted from the port of the extension 81, and the external air enters the protective component from the heat dissipation vent to realize air circulation, ensure that the electromagnetic coil 3 is at a suitable working temperature, and ensure its stable performance and service life. The dustproof net 1 82 and the dustproof net 2 9 prevent external dust from covering the electromagnetic coil 3 to ensure stable operation.

[0050] Step 5: The connection part 1 4 and the connection part 2 5 at both ends of the sludge conveying pipe 1 are respectively equipped with a sludge feed pipe 41 and a sludge discharge pipe 51 for the entry and exit of sludge. The annular grooves 52 on the surfaces of the connection part 1 4 and the connection part 2 5 cooperate with the raised rings 83 at both ends of the semicircular protective tube 8 to realize the installation of the protective assembly. The two semicircular protective tubes 8 form a protective assembly, which is fixed by a fixing ring 84 and a bolt 85. The support rod 87 at the bottom end of the lower fixing ring 84 supports the sludge conveying pipe 1. The protective assembly not only protects the internal components, but also cooperates with the cooling fan 74 to optimize the heat dissipation path and ensure stable operation of the system.

[0051] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. A multi-stage shearing and anti-blocking sludge conveying system, comprising a sludge conveying pipe (1) and a screw propeller, characterized in that: The outer wall of the sludge conveying pipe (1) is wound with an electromagnetic coil (3), the material of the electromagnetic coil (3) is a high-temperature resistant and corrosion-resistant enameled copper flat wire, the electromagnetic coil (3) is wound spirally along the axial direction of the sludge conveying pipe (1) using a multi-layer dense winding method, and the interlayers of the electromagnetic coil (3) are filled with an insulating thermal conductive adhesive, and the insulating thermal conductive adhesive is silicone rubber; The sludge conveying pipe (1) is composed of stable sections (13) at both ends and a plurality of variable diameter units located in the middle. The stable section (13) is a circular tube structure. The variable diameter units are arranged in sequence along the axial direction of the sludge conveying pipe (1). Each variable diameter unit is composed of an expansion section (11) and a contraction section (12). The plurality of variable diameter units are arranged alternately in the form of contraction section (12)-expansion section (11). The cone angle of the expansion section (11) is 15°-20°, and the cone angle of the contraction section (12) is 25°-30°. The spacing between adjacent variable diameter units is 3-5 times the diameter of the sludge conveying pipe (1). The screw propeller comprises a shaft (2) and a spiral blade (21), the screw propeller is located inside the sludge conveying pipe (1), the spiral blade (21) is fixedly mounted on the shaft (2), the spiral blade (21) adopts an asymmetric design with a forward tilt of 12°-15°, the pitch of the spiral blade (21) increases by 10%-15% in the expansion section (11), and decreases by 8%-12% in the contraction section (12); The inner wall of the contraction section (12) is provided with diamond-shaped convex patterns, the height of the diamond-shaped convex patterns is 0.8-1.2 mm, and an embedded microwave moisture content sensor is installed on the sludge conveying pipe (1).

2. A multi-stage shearing and anti-blocking sludge conveying system according to claim 1, characterized in that: The two ends of the sludge conveying pipe (1) are respectively fixedly mounted with a connecting portion 1 (4) and a connecting portion 2 (5); the upper end of the connecting portion 1 (4) is fixedly mounted with a sludge feeding pipe (41), and the bottom of the connecting portion 2 (5) is fixedly mounted with a sludge discharging pipe (51); Wherein, the surfaces of the connecting portion 1 (4) and the connecting portion 2 (5) are both provided with an annular groove (52).

3. A multi-stage shearing and anti-blocking sludge conveying system as claimed in claim 2, characterized in that: A motor (6) is fixedly mounted on the connecting portion 1 (4), and a driving gear (61) is fixedly mounted on the output shaft of the motor (6). Both ends of the shaft body (2) are rotatably connected to the connecting portion 1 (4) and the connecting portion 2 (5), respectively, and the output shaft of the motor (6) is fixedly connected to the shaft body (2).

4. A multi-stage shearing and anti-blocking sludge conveying system as claimed in claim 3, characterized in that: A connecting rod (7) is fixedly mounted on the connecting portion 1 (4), a rotating shaft (72) is rotatably mounted on the connecting rod (7), and a driven gear (71) is fixedly mounted on the rotating shaft (72); Wherein, the driving gear (61) is meshed with the driven gear (71).

5. A multi-stage shearing and anti-blocking sludge conveying system as claimed in claim 4, characterized in that: A cooling fan (74) is rotatably mounted on the connecting rod (7), a second bevel gear (75) is fixedly mounted on the shaft end of the cooling fan (74), and a first bevel gear (73) is fixedly mounted on the rotating shaft (72); Wherein, the bevel gear 1 (73) is meshed with the bevel gear 2 (75).

6. A multi-stage shearing and anti-blocking sludge conveying system as claimed in claim 5, characterized in that: The outer side of the sludge conveying pipe (1) is provided with a protective assembly, the protective assembly comprising two semicircular protective pipes (8), and two protruding rings (83) are fixedly mounted on opposite ends of the two semicircular protective pipes (8); Each of the raised rings (83) is inserted into the annular groove (52), and the inner wall of each of the semicircular protective tubes (8) is in contact with the outer surface of the connecting portion 1 (4) and the connecting portion 2 (5).

7. A multi-stage shearing and anti-blocking sludge conveying system as claimed in claim 6, characterized in that: A fixing ring (84) is fixedly mounted on the outer wall of each semicircular protective tube (8), a bolt (85) is rotatably screwed into the fixing ring (84) on the upper side, and the fixing ring (84) on the upper side is threadedly fixed to the fixing ring (84) on the lower side through the bolt (85).

8. A multi-stage shearing and anti-blocking sludge conveying system as claimed in claim 7, characterized in that: A plurality of reinforcement blocks (86) are fixedly mounted on both sides of the inner wall of each semicircular protective tube (8), and the reinforcement block (86) located on the upper side is fitted with the end of the reinforcement block (86) located on the lower side; Wherein, a support rod (87) is fixedly installed at the bottom end of the fixing ring (84) located at the lower side.

9. A multi-stage shearing and anti-blocking sludge conveying system as claimed in claim 8, characterized in that: An extension portion (81) is fixedly mounted on each of the semicircular protective tubes (8), each of the extension portions (81) is communicated with the interior of the semicircular protective tube (8), and a dust screen (82) is fixedly mounted at the end of each of the extension portions (81); The two extension portions (81) form a semi-enclosed structure, and the heat dissipation fan (74) is located in the semi-enclosed structure.

10. A multi-stage shearing and anti-blocking sludge conveying system according to claim 9, characterized in that: A heat dissipation opening is provided on the bottom surface of the semicircular protective tube (8) located at the lower side, and a second dustproof net (9) is embedded in the heat dissipation opening.

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