Resistance reduction device of cemented filling slurry conveying pipeline

Abstract

The invention discloses a resistance reduction device for a cemented filling slurry conveying pipeline, and relates to the technical field of pipeline resistance reduction. Comprising a conveying pipe and a resistance reduction support, the resistance reduction support is fixedly installed at the top end of the conveying pipe, the side end face of the conveying pipe fixedly communicates with two material distribution inlet pipes, and a spiral conveying assembly is arranged in the conveying pipe; a resistance reduction assembly is arranged on the conveying pipe, slurry entering the conveying pipe is in a uniform flowing state through the resistance reduction assembly, the spiral conveying assembly comprises a driving motor fixedly installed on a resistance reduction support, a driving shaft is fixedly installed at the output end of the driving motor, spiral conveying blades are fixedly installed on the driving shaft, and the spiral conveying blades are arranged on the spiral conveying assembly. The end, away from the driving motor, of the driving shaft extends into the conveying pipe. Through cooperative use of the spiral conveying assembly and the resistance reduction assembly, the fluidity of slurry in the conveying pipe is improved, and meanwhile friction and resistance between the slurry and the inner wall of the conveying pipe in the conveying process are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline drag reduction, in particular to a drag reduction device for a cementing filling slurry conveying pipeline. Background Art

[0002] Cemented filling slurry is an important process material in gold mining. It is often used for backfilling and supporting underground spaces during mining, especially in abandoned spaces generated during mining. It is made by mixing fine materials with cement or other cementing materials to form a slurry with cohesiveness, fluidity and certain strength, which is used to fill the voids or unmined parts after mining.

[0003] In the prior art, a Chinese patent with the authorization announcement number CN111981235B discloses a drag reduction device for a cemented filling slurry conveying pipeline. When the filling slurry flows through the variable diameter cone section of the feed pipeline, the filling slurry forms a full pipe flow, and the pressure is gradually reduced. When the filling slurry enters the discharge pipeline, the space between the filling slurry and the inner wall of the discharge pipeline is filled with an annular water film; that is, the annular water film covers the inner wall of the discharge pipeline, and the filling slurry does not contact the inner wall of the pipeline, but is wrapped by the annular water film; after that, the annular water film wraps the cemented filling slurry and continues to be conveyed to the downstream pipeline by gravity until the annular water film gradually disappears. Therefore, during the existence of the annular water film, the friction coefficient between the filling slurry and the pipe wall is reduced, the conveying resistance of the filling slurry is reduced, the conveying distance of the filling slurry is extended, and the wear degree of the pipeline is reduced, which solves the problem that the friction between the slurry and the inner wall of the existing conveying pipeline is large, resulting in low conveying efficiency of the conveying pipeline.

[0004] When the existing conveying pipeline is transporting slurry, the friction between the slurry and the inner wall of the pipeline is large, which can easily cause the slurry to be blocked in the pipeline and cause pipeline damage. The current method is to inject water to increase the fluidity of the slurry to reduce the friction between the slurry and the inner wall of the pipeline. However, in this method, since the slurry needs to be filled in the holes, the performance of the slurry needs to be guaranteed. Too much water injection will cause the performance of the slurry to decrease, and the holes cannot be filled. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a drag reducing device for a cementing filling slurry conveying pipeline, which solves the problems mentioned in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: The drag reduction device of the cementing filling slurry conveying pipeline comprises a conveying pipe and a drag reduction bracket, wherein the drag reduction bracket is fixedly installed at the top of the conveying pipe, the side end surface of the conveying pipe is fixedly connected with two material distribution inlet pipes, and a spiral conveying component is arranged inside the conveying pipe; The conveying pipe is provided with a drag reduction component, through which the slurry entering the conveying pipe is kept in a uniform flow state; The spiral conveying assembly includes a driving motor fixedly mounted on a drag reduction bracket, a driving shaft fixedly mounted on the output end of the driving motor, a spiral conveying blade fixedly mounted on the driving shaft, an end of the driving shaft away from the driving motor extends to the interior of a conveying pipe, and the spiral conveying blade is located inside the conveying pipe and below the outlets of two material distribution inlet pipes.

[0007] Preferably, symmetrically arranged heating rings are fixedly installed inside the conveying pipe and below the spiral conveying blades, and a heating rod is fixedly installed between two of the heating rings. There are multiple heating rods and they are arranged in a ring shape between the two heating rings. The heating rings and the heating rods are both in contact with the inside of the conveying pipe.

[0008] Preferably, the drag reduction assembly includes a positioning plate fixedly mounted on the drag reduction bracket, a bearing fixedly mounted on the positioning plate, an auxiliary shaft fixedly mounted on the bearing, a small transmission wheel fixedly mounted on the top end of the auxiliary shaft, a push blade fixedly mounted on the side end surface of the auxiliary shaft, and a large transmission wheel fixedly mounted on the drive shaft.

[0009] Preferably, the bottom end of the auxiliary shaft passes through the material distribution inlet pipe and is located below the material distribution inlet pipe, the pushing blade is located inside the material distribution inlet pipe, and the small transmission wheel and the large transmission wheel are driven by a belt.

[0010] Preferably, a reciprocating screw is fixedly installed on the driving shaft and above the large transmission wheel, a movable block is movably installed on the reciprocating screw, a crescent pin is movably installed on the movable block, a limiting block is fixedly installed on the side end face of the movable block, and a limiting groove for use with the limiting block is provided on the inner side face of the drag reduction bracket.

[0011] Preferably, an air outlet pipe is fixedly installed on the inner bottom of the drag reduction bracket, a push rod is movably installed on the air outlet pipe, the air outlet of the air outlet pipe is fixedly connected to a connecting pipe, the end of the connecting pipe away from the air outlet pipe is fixedly connected to an annular pipe, the annular pipe is fixedly connected to an exhaust pipe, and a one-way valve is provided on the exhaust pipe.

[0012] Preferably, one end of the push rod away from the exhaust pipe is fixedly connected to the lower end surface of the limit block, and there are multiple exhaust pipes, which are arranged to have different lengths.

[0013] Preferably, a rotating disk is fixedly installed on the bottom end of the auxiliary shaft, a positioning shaft is fixedly installed on the lower end surface of the rotating disk, a driving rod is rotatably installed on the positioning shaft, a U-shaped frame is fixedly installed on the lower end surface of the material distribution inlet pipe, and a knocking rod is slidably installed inside the U-shaped frame.

[0014] Preferably, one end of the knocking rod is rotatably connected to a driving rod, and through the rotation of the rotating disk, the driving rod is utilized to drive the knocking rod to move horizontally on the U-shaped frame, so that the knocking rod reciprocates to knock the outer side wall of the conveying pipe.

[0015] The present invention provides a drag reduction device for cementing filling slurry conveying pipeline. Compared with the prior art, it has the following beneficial effects: 1. The present invention drives the spiral conveying blades on the driving shaft to rotate by a driving motor, so that the slurry entering the conveying pipe is pushed by the spiral conveying blades. At the same time, the slurry is in a spiral state during the process of being pushed, which can effectively reduce the friction between the slurry and the inner wall of the conveying pipe. When the slurry flows in a spiral, the heat generated is transferred to the heating rod through the heating ring, and the heat is transferred to the slurry through the heating rod, which can effectively reduce the viscosity of the slurry, ensure the flow effect of the slurry in the conveying pipe, greatly reduce the friction between the slurry and the inner wall of the pipe, and play a good drag reduction effect. 2. In the present invention, when the driving shaft rotates, the large transmission wheel will drive the small transmission wheel on the auxiliary shaft to rotate through the belt, and the rotation of the small transmission wheel drives the push blade on the auxiliary shaft to rotate. The slurry in the material distribution inlet pipe is quickly discharged into the conveying pipe by the rotation of the push blade, ensuring that the slurry can be quickly and evenly conveyed to the conveying pipe, avoiding the problem of slurry retention or agglomeration, and ensuring the continuous and stable flow of the slurry; 3. In the present invention, when the driving shaft rotates, the reciprocating screw is driven to rotate. The movable block on the reciprocating screw can ensure the movable block to realize reciprocating movement on the reciprocating screw through the rotation of the crescent pin and the limited sliding of the limit block in the limit groove. The limit block on the movable block drives the piston on the push rod to reciprocate in the air outlet pipe. The gas in the air outlet pipe is discharged into the annular pipe through the connecting pipe. The gas in the annular pipe is discharged into the conveying pipe through exhaust pipes of different lengths. The gas is discharged into the slurry at different positions through the exhaust pipe. The viscosity of the slurry is reduced by the action of the gas, and the friction between the slurry and the inner wall of the pipeline is reduced, thereby greatly improving the drag reduction effect of the drag reduction device. 4. In the present invention, when the auxiliary shaft rotates, the auxiliary shaft will synchronously drive the rotating disk to rotate, and the positioning shaft on the rotating disk will be used to drive the driving rod to rotate. The U-shaped frame limits the knocking rod, and the driving rod rotates around the rotating disk, thereby realizing the reciprocating horizontal movement of the knocking rod. The reciprocating movement of the knocking rod is used to complete the continuous knocking of the conveying pipe, and the vibration force generated by the knocking is transmitted to the inner wall of the conveying pipe, thereby improving the fluidity of the slurry in the conveying pipe and enhancing the drag reduction effect of the drag reduction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a front cross-sectional view of the delivery pipe in the present invention; Figure 3 is a side cross-sectional view of the delivery pipe in the present invention; Figure 4 It is a schematic diagram of the structure of the limit block in the present invention; Figure 5 It is a structural schematic diagram of the annular tube in the present invention; Figure 6 It is a schematic diagram of the structure of the drag reduction component in the present invention; Figure 7 It is a schematic diagram of the structure of the knocking rod in the present invention; Figure 8 It is a schematic diagram of the structure of the heating ring in the present invention.

[0017] In the figure: 1. conveying pipe; 2. drag reduction bracket; 3. material feeding pipe; 4. driving motor; 5. driving shaft; 6. spiral conveying blade; 7. heating ring; 8. heating rod; 9. positioning plate; 10. bearing; 11. auxiliary shaft; 12. small transmission wheel; 13. pushing blade; 14. large transmission wheel; 15. reciprocating screw; 16. movable block; 17. crescent pin; 18. limit block; 19. limit groove; 20. exhaust pipe; 21. push rod; 22. connecting pipe; 23. annular pipe; 24. exhaust pipe; 25. one-way valve; 26. rotating disk; 27. positioning shaft; 28. driving rod; 29. ​​U-shaped frame; 30. knocking rod. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 8The drag reduction device of the cementing filling slurry conveying pipeline of the present invention comprises a conveying pipe 1 and a drag reduction bracket 2, the drag reduction bracket 2 is fixedly installed at the top of the conveying pipe 1, the side end face of the conveying pipe 1 is fixedly connected to two material distribution inlet pipes 3, a spiral conveying assembly is arranged inside the conveying pipe 1, the spiral conveying assembly comprises a driving motor 4 fixedly installed on the drag reduction bracket 2, a driving shaft 5 is fixedly installed at the output end of the driving motor 4, a spiral conveying blade 6 is fixedly installed on the driving shaft 5, the end of the driving shaft 5 away from the driving motor 4 extends to the inside of the conveying pipe 1, the spiral conveying blade 6 is inside the conveying pipe 1 and below the outlets of the two material distribution inlet pipes 3, a symmetrically arranged heating ring 7 is fixedly installed inside the conveying pipe 1 and below the spiral conveying blade 6, and a heating ring 7 is fixed between the two heating rings 7 A heating rod 8 is installed. There are multiple heating rods 8 and they are arranged in a ring between two heating rings 7. The heating ring 7 and the heating rod 8 are both in contact with the inside of the conveying pipe 1, wherein the heating ring 7 and the heating rod 8 are in contact with the inner wall of the conveying pipe 1 to ensure that the slurry in the conveying pipe 1 will not be blocked by the heating ring 7 and the heating rod 8, so as to avoid affecting the normal conveying of the slurry. The power supply of the heating ring 7 can be installed on the surface of the conveying pipe 1. Since this technology is well known to people in this field, it will not be described in detail here. In the process of heating the slurry, the slurry is heated slowly, and the heating temperature is within the heat resistance range of the slurry. The principle of the heating ring 7 is to use electric heating. People use the principle of the temperature controller in the prior art to complete the control of the slurry heating temperature.

[0020] In the present invention, the spiral conveying blades 6 on the driving shaft 5 are driven to rotate by the driving motor 4, so that the slurry entering the conveying pipe 1 is pushed by the spiral conveying blades 6. At the same time, the slurry is in a spiral state during the process of being pushed, which can effectively reduce the friction between the slurry and the inner wall of the conveying pipe 1. When the slurry flows in a spiral, the heat generated is transferred to the heating rod 8 through the heating ring 7. The heat is transferred to the slurry through the heating rod 8, which can effectively reduce the viscosity of the slurry, ensure the flow effect of the slurry in the conveying pipe 1, greatly reduce the friction between the slurry and the inner wall of the pipe, and achieve a good drag reduction effect.

[0021] A drag reduction component is provided on the conveying pipe 1, through which the slurry entering the conveying pipe 1 is in a state of uniform flow. The drag reduction component includes a positioning plate 9 fixedly mounted on the drag reduction bracket 2, a bearing 10 fixedly mounted on the positioning plate 9, an auxiliary shaft 11 fixedly mounted on the bearing 10, a small transmission wheel 12 fixedly mounted on the top of the auxiliary shaft 11, a pushing blade 13 fixedly mounted on the side end face of the auxiliary shaft 11, a large transmission wheel 14 fixedly mounted on the driving shaft 5, the bottom end of the auxiliary shaft 11 passes through the material distribution inlet pipe 3 and is located below the material distribution inlet pipe 3, the pushing blade 13 is located inside the material distribution inlet pipe 3, the small transmission wheel 12 and the large transmission wheel 14 are driven by a belt, wherein the friction between the small transmission wheel 12, the large transmission wheel 14 and the belt is large, and the size of the small transmission wheel 12 is smaller than that of the large transmission wheel 14, when the large transmission wheel 14 rotates one circle, the small transmission wheel 12 rotates multiple circles.

[0022] In the present invention, when the driving shaft 5 rotates, the large transmission wheel 14 will be driven to rotate, and the large transmission wheel 14 will drive the small transmission wheel 12 on the auxiliary shaft 11 to rotate through the belt drive, and the rotation of the small transmission wheel 12 drives the push blade 13 on the auxiliary shaft 11 to rotate. By utilizing the rotation of the push blade 13, the slurry in the material distribution inlet pipe 3 is quickly discharged into the conveying pipe 1, ensuring that the slurry can be quickly and evenly conveyed to the conveying pipe 1, avoiding the problem of slurry retention or agglomeration, and ensuring the continuous and stable flow of the slurry.

[0023] A reciprocating screw 15 is fixedly installed on the driving shaft 5 and above the large transmission wheel 14, a movable block 16 is movably installed on the reciprocating screw 15, a crescent pin 17 is movably installed on the movable block 16, a limit block 18 is fixedly installed on the side end face of the movable block 16, a limit groove 19 for use with the limit block 18 is opened on the inner side face of the drag reduction bracket 2, the limit block 18 is slidably connected to the limit groove 19, wherein the shape of the limit block 18 is set to be T-shaped, an air outlet pipe 20 is fixedly installed on the inner bottom of the drag reduction bracket 2, a push rod 21 is movably installed on the air outlet pipe 20, and the air outlet of the air outlet pipe 20 is fixedly connected to a connecting pipe 22, and the connecting pipe 22 is away from the outlet One end of the air pipe 20 is fixedly connected to a ring-shaped tube 23, and the ring-shaped tube 23 is fixedly connected to an exhaust pipe 24, and a one-way valve 25 is provided on the exhaust pipe 24. The end of the push rod 21 away from the air outlet pipe 20 is fixedly connected to the lower end surface of the limit block 18. There are multiple exhaust pipes 24, and the multiple exhaust pipes 24 are set to different lengths. The air outlet pipe 20 is fixedly connected to a ventilation pipe, and a valve is provided on the ventilation pipe. A piston is fixedly installed on the end of the push rod 21 away from the limit block 18. The structure of the air outlet pipe 20 is the same as the structure of the air pump in the prior art. Since this technology is well known to people in this field, it will not be described in detail here.

[0024] In the present invention, when the driving shaft 5 rotates, the reciprocating screw 15 will be driven to rotate. The movable block 16 on the reciprocating screw 15 will slide in the limiting groove 19 through the rotation of the crescent pin 17 and the limiting block 18, ensuring that the movable block 16 can achieve reciprocating movement on the reciprocating screw 15. The limiting block 18 on the movable block 16 drives the piston on the push rod 21 to reciprocate in the outlet pipe 20. The gas in the outlet pipe 20 will be discharged into the annular pipe 23 through the connecting pipe 22. The gas in the annular pipe 23 will be discharged into the conveying pipe 1 through exhaust pipes 24 of different lengths. The gas is discharged into the slurry at different positions through the exhaust pipe 24, and the viscosity of the slurry is reduced by the action of the gas, and the friction between the slurry and the inner wall of the pipeline is reduced, thereby greatly improving the drag reduction effect of the drag reduction device.

[0025] A rotating disk 26 is fixedly installed at the bottom end of the auxiliary shaft 11, and a positioning shaft 27 is fixedly installed on the lower end surface of the rotating disk 26. A driving rod 28 is rotatably installed on the positioning shaft 27. A U-shaped frame 29 is fixedly installed on the lower end surface of the material distribution inlet pipe 3, and a knocking rod 30 is slidably installed inside the U-shaped frame 29. One end of the knocking rod 30 is rotatably connected to the driving rod 28. Through the rotation of the rotating disk 26, the driving rod 28 is used to drive the knocking rod 30 to move horizontally on the U-shaped frame 29, so that the knocking rod 30 reciprocates and knocks on the outer wall of the conveying pipe 1, wherein the positioning shaft 27 on the rotating disk 26 rotates around the auxiliary shaft 11 as the center.

[0026] In the present invention, when the auxiliary shaft 11 rotates, the auxiliary shaft 11 will synchronously drive the rotating disk 26 to rotate, and the positioning shaft 27 on the rotating disk 26 will be used to drive the driving rod 28 to rotate. The U-shaped frame 29 limits the knocking rod 30, and the driving rod 28 rotates around the rotating disk 26, thereby realizing the reciprocating horizontal movement of the knocking rod 30. The reciprocating movement of the knocking rod 30 is used to complete the continuous knocking of the conveying pipe 1, and the vibration force generated by the knocking is transmitted to the inner wall of the conveying pipe 1, thereby improving the fluidity of the slurry in the conveying pipe 1 and enhancing the drag reduction effect of the drag reduction device.

[0027] Working principle: When in use, the slurry is discharged into the conveying pipe 1 through the material distribution inlet pipe 3. During the conveying process of the slurry in the conveying pipe 1, the spiral conveying blade 6 on the driving shaft 5 is driven by the driving motor 4 to rotate, so that the slurry entering the conveying pipe 1 is pushed by the spiral conveying blade 6. At the same time, the slurry is in a spiral state during the process of being pushed, which can effectively reduce the friction between the slurry and the inner wall of the conveying pipe 1. When the slurry flows in a spiral, the heat generated is transferred to the heating rod 8 through the heating ring 7. The heat is transferred to the slurry through the heating rod 8, which can effectively reduce the viscosity of the slurry. When the driving shaft 5 rotates, it will drive the large transmission wheel 14 to rotate. The large transmission wheel 14 will drive the small transmission wheel 12 on the auxiliary shaft 11 to rotate through the belt drive. The rotation of the small transmission wheel 12 drives the push blade 13 on the auxiliary shaft 11 to rotate. The rotation of the push blade 13 is used to quickly discharge the slurry in the material distribution inlet pipe 3 into the conveying pipe 1, ensuring that the slurry can be quickly and evenly transported to the conveying pipe 1. When the driving shaft 5 rotates, the reciprocating screw 15 is driven to rotate. The movable block 16 on the reciprocating screw 15 can ensure that the movable block 16 can achieve reciprocating movement on the reciprocating screw 15 through the rotation of the crescent pin 17 and the limiting block 18 sliding in the limiting groove 19. The limiting block 18 on the movable block 16 drives the piston on the push rod 21 to reciprocate in the outlet pipe 20. The gas in the outlet pipe 20 is discharged into the annular pipe 23 through the connecting pipe 22. The gas in the annular pipe 23 is discharged into the conveying pipe 1 through the exhaust pipes 24 of different lengths. The gas is discharged into the slurry at different positions through the exhaust pipe 24, and the viscosity of the slurry is reduced by the effect of the gas, thereby reducing the friction between the slurry and the inner wall of the pipeline. When the auxiliary shaft 11 rotates, the auxiliary shaft 11 will synchronously drive the rotating disk 26 to rotate, and the positioning shaft 27 on the rotating disk 26 will drive the driving rod 28 to rotate. The U-shaped frame 29 limits the knocking rod 30, and the driving rod 28 rotates around the rotating disk 26, thereby realizing the reciprocating horizontal movement of the knocking rod 30. The reciprocating movement of the knocking rod 30 is used to complete the continuous knocking of the conveying pipe 1, and the vibration force generated by the knocking is transmitted to the inner wall of the conveying pipe 1, thereby improving the fluidity of the slurry in the conveying pipe 1.

[0028] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A drag reduction device for a cementing filling slurry conveying pipeline, comprising a conveying pipe (1) and a drag reduction bracket (2), characterized in that: The drag reduction bracket (2) is fixedly mounted on the top end of the conveying pipe (1); the side end surface of the conveying pipe (1) is fixedly connected to two material distribution inlet pipes (3); and a spiral conveying assembly is arranged inside the conveying pipe (1); The conveying pipe (1) is provided with a drag reduction component, and the drag reduction component enables the slurry entering the conveying pipe (1) to be in a uniform flow state; The spiral conveying assembly comprises a driving motor (4) fixedly mounted on a drag reduction bracket (2); a driving shaft (5) is fixedly mounted on the output end of the driving motor (4); a spiral conveying blade (6) is fixedly mounted on the driving shaft (5); an end of the driving shaft (5) away from the driving motor (4) extends to the interior of a conveying pipe (1); and the spiral conveying blade (6) is located inside the conveying pipe (1) and below the outlets of two material distribution inlet pipes (3).

2. The drag reducing device for cementing filling slurry conveying pipeline according to claim 1 is characterized in that: A symmetrically arranged heating ring (7) is fixedly installed inside the conveying pipe (1) and below the spiral conveying blade (6); a heating rod (8) is fixedly installed between two of the heating rings (7); the heating rods (8) are multiple in number and are arranged in a ring shape between the two heating rings (7); the heating rings (7) and the heating rods (8) are both in contact with the inside of the conveying pipe (1).

3. The drag reducing device for cementing filling slurry conveying pipeline according to claim 1 is characterized in that: The drag reduction assembly comprises a positioning plate (9) fixedly mounted on the drag reduction bracket (2), a bearing (10) fixedly mounted on the positioning plate (9), an auxiliary shaft (11) fixedly mounted on the bearing (10), a small transmission wheel (12) fixedly mounted on the top end of the auxiliary shaft (11), a push blade (13) fixedly mounted on the side end surface of the auxiliary shaft (11), and a large transmission wheel (14) fixedly mounted on the drive shaft (5).

4. The drag reducing device for cementing filling slurry conveying pipeline according to claim 3 is characterized in that: The bottom end of the auxiliary shaft (11) passes through the material distribution inlet pipe (3) and is located below the material distribution inlet pipe (3). The pushing blade (13) is located inside the material distribution inlet pipe (3). The small transmission wheel (12) and the large transmission wheel (14) are driven by a belt.

5. The drag reducing device for cementing filling slurry conveying pipeline according to claim 3 is characterized in that: A reciprocating screw (15) is fixedly mounted on the drive shaft (5) and above the large transmission wheel (14); a movable block (16) is movably mounted on the reciprocating screw (15); a crescent pin (17) is movably mounted on the movable block (16); a limit block (18) is fixedly mounted on the side end surface of the movable block (16); and a limit groove (19) for use with the limit block (18) is provided on the inner side surface of the drag reduction bracket (2).

6. The drag reducing device for cementing filling slurry conveying pipeline according to claim 4 is characterized in that: An air outlet pipe (20) is fixedly mounted on the inner bottom of the drag reduction bracket (2), a push rod (21) is movably mounted on the air outlet pipe (20), an air outlet of the air outlet pipe (20) is fixedly connected to a connecting pipe (22), one end of the connecting pipe (22) away from the air outlet pipe (20) is fixedly connected to an annular pipe (23), an exhaust pipe (24) is fixedly connected to the annular pipe (23), and a one-way valve (25) is provided on the exhaust pipe (24).

7. The drag reducing device for cementing filling slurry conveying pipeline according to claim 6 is characterized by: One end of the push rod (21) away from the air outlet pipe (20) is fixedly connected to the lower end surface of the limit block (18); there are a plurality of exhaust pipes (24), and the plurality of exhaust pipes (24) are arranged to have different lengths.

8. The drag reducing device for cementing filling slurry conveying pipeline according to claim 3 is characterized by: A rotating disk (26) is fixedly mounted on the bottom end of the auxiliary shaft (11), a positioning shaft (27) is fixedly mounted on the lower end surface of the rotating disk (26), a driving rod (28) is rotatably mounted on the positioning shaft (27), a U-shaped frame (29) is fixedly mounted on the lower end surface of the material distribution inlet pipe (3), and a knocking rod (30) is slidably mounted inside the U-shaped frame (29).

9. The drag reducing device for cementing filling slurry conveying pipeline according to claim 8, characterized in that: One end of the knocking rod (30) is rotatably connected to the driving rod (28). The driving rod (28) drives the knocking rod (30) to move horizontally on the U-shaped frame (29) through the rotation of the rotating disk (26), so that the knocking rod (30) reciprocates and knocks the outer wall of the conveying pipe (1).

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