Conveying device and control method for cementitious slurry

Abstract

This invention discloses a conveying device and control method for cementitious slurry. The conveying device includes a feed pump, an inner pipe, an outer pipe, multiple pressure gauges, and multiple first sealing caps. The outer pipe is sleeved on the inner pipe and spaced radially from the inner pipe to define an annular channel between the inner and outer pipes. The inlet end of the outer pipe is sealed to the inner pipe. The inner pipe has multiple openings spaced along its axial direction. At least one pressure gauge is positioned between two adjacent openings. Each pressure gauge has a probe placed inside the inner pipe to monitor the pressure within the inner pipe. Each opening is provided with at least one first sealing cap, the position of which is adjustable and connected to the inner pipe to seal or open the opening. The conveying device for cementitious slurry of this invention has the advantages of high conveying and filling efficiency.

Description

Technical Field

[0001] This invention relates to the field of cementitious slurry conveying technology, and more specifically to a conveying device and control method for cementitious slurry. Background Technology

[0002] Backfilling mining technology is one of the important technologies for achieving green and low-carbon mining. It has significant technical advantages in terms of surface subsidence control, ecological environment protection, mine solid waste disposal and utilization, and green and low-carbon emission reduction. Cemented backfilling, as one of the backfilling mining technologies, has unique advantages in solving technical problems such as controlling surface subsidence, realizing underground mining, and increasing the upper limit of coal mining.

[0003] However, in backfilling mining, pipeline transportation is a relatively weak link in the backfilling process. Its stability restricts the safety and continuity of the backfilling system. Among them, pipeline blockage is the most serious problem and is a common problem faced by mine backfilling. When the pipeline is blocked, it is necessary to suspend filling and waste a lot of manpower and resources to clear the pipeline, resulting in low transportation and filling efficiency and seriously hindering the normal progress of backfilling operations. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention provide a conveying device for cementing slurry with high conveying and filling efficiency.

[0006] Embodiments of the present invention also propose a control method for a conveying device for cementing slurry with high conveying and filling efficiency.

[0007] The conveying device for cementing slurry according to an embodiment of the present invention includes a feed pump, an inner tube, an outer tube, multiple pressure gauges, and multiple first sealing caps. The feed pump has an inlet and an outlet. The inlet end of the inner tube is connected to the outlet. The outer tube is sleeved on the inner tube and is spaced apart from the inner tube in its radial direction so that an annular channel is defined between the inner tube and the outer tube. The inlet end of the outer tube is sealed to the inner tube. The inner tube has multiple openings spaced apart along the axial direction of the inner tube.

[0008] At least one pressure gauge is provided between two adjacent openings, and the pressure gauge has a probe placed inside the inner tube to monitor the pressure of the inner tube;

[0009] Each of the openings is provided with at least one first sealing cap, the first sealing cap being adjustablely connected to the inner tube so that the first sealing cap can switch between a first position and a second position. In the first position, the first sealing cap is fitted onto the opening to seal the opening, and in the second position, the first sealing cap is separated from the opening.

[0010] In some embodiments, the conveying device for cementing slurry of the present invention further includes a rotating shaft, a first driving member, and a plurality of turbine fans. At least a portion of the rotating shaft is disposed inside the inner tube and the axis of the rotating shaft coincides with the axis of the inner tube. The rotating shaft is rotatably connected to the inner tube. The first driving member is throttle connected to the rotating shaft to drive the rotating shaft to rotate. The plurality of turbine fans are spaced apart on the rotating shaft along the axial direction of the rotating shaft.

[0011] In some embodiments, the conveying device for cementing slurry of the present invention further includes a plurality of second sealing caps, each of the openings having at least one second sealing cap, the second sealing caps being positionably connected to the inner tube so that the second sealing caps can be switched between a third position and a fourth position. In the third position, the second sealing cap is fitted onto the opening and cooperates with the first sealing cap to block the opening. In the fourth position, the second sealing cap is separated from the opening, and the second sealing cap blocks the rear section of the inner tube corresponding to the opening.

[0012] In some embodiments, the conveying device for cementing slurry of the present invention further includes a second driving member, which is disposed between the inner tube and the outer tube. The second driving member includes a first fixing part and a first telescopic part. The first telescopic part is telescopic relative to the first fixing part. The first fixing part is hinged to the inner tube. The first telescopic part is hinged to one end of the first sealing cover. The other end of the first sealing cover is hinged to the inner tube. The second driving member is used to drive the first sealing cover to rotate so that the first sealing cover switches between the first position and the second position.

[0013] In some embodiments, the conveying device for cementing slurry of the present invention further includes a third driving member disposed inside the inner tube. The third driving member includes a second fixed part and a second telescopic part. The second telescopic part is telescopic relative to the second fixed part. The second fixed part is hinged to the inner tube. The second telescopic part is hinged to one end of the second sealing cover. The other end of the second sealing cover is hinged to the inner tube. The third driving member is used to drive the second sealing cover to rotate so that the second sealing cover switches between the third position and the fourth position.

[0014] In some embodiments, the conveying device for cementing slurry of the present invention further includes a control system. The pressure gauges are all signal-connected to the control system to receive the pressure values ​​of the pressure gauges. The first drive member, the second drive member, and the third drive member are all electrically and signal-connected to the control system. When the inner tube between two adjacent openings is blocked, the pressure gauge on the blocked section of the inner tube exceeds a first preset value. The pressure gauge transmits a first signal to the control system. The control system controls the first drive member to increase the rotational speed of the rotating shaft to clear the blocked section of the inner tube. The control system also controls the second drive member to drive the first sealing cover to the second position and controls the third drive member to the fourth position.

[0015] In some embodiments, the conveying device for cementing slurry of the present invention further includes a cleaning and pressurizing device, which includes a pressurizing water pump and an air compressor. The outlet of the pressurizing water pump is connected to the inner pipe and the annular channel respectively for cleaning the inner pipe and the outer pipe. The outlet of the air compressor is connected to the annular channel for pressurizing the annular channel.

[0016] In some embodiments, the ratio between the inner diameter of the outer tube and the outer diameter of the inner tube is 2-3.

[0017] In some embodiments, the distance between two adjacent openings is 1.5m-2m.

[0018] The control method for a conveying device for cementing slurry according to embodiments of the present invention, based on the conveying device for cementing slurry described in any of the above embodiments, includes the following steps:

[0019] S1: During normal use, the first sealing cover is located in the first position, the second sealing cover is located in the third position, the binder slurry is transported to the filling area through the inner tube, and the cleaning and pressurizing device delivers compressed air into the annular channel to assist in sealing the first sealing cover.

[0020] S2: The pressure of the inner tube is detected by the pressure gauge. When the value of one of the pressure gauges exceeds the first preset pressure value, the pressure gauge that exceeds the first preset pressure value is the first pressure gauge. The two openings adjacent to the first pressure gauge are the first opening and the second opening. The first opening is located closer to the inlet end of the inner tube than the second opening. The first pressure gauge gives a first signal to the control system.

[0021] S3: After receiving the first signal, the control system controls the first driving component to increase the rotation speed of the rotating shaft to clear the blockage in the inner tube. The control system also controls the second driving component located at the first opening to drive the first sealing cover to the second position and the control system controls the third driving component located at the first opening to drive the second sealing cover to the fourth position, so that the cementing slurry can be transported to the filling area through the annular channel and the air compressor can be turned off.

[0022] S4: After the filling operation is completed, turn off the material pump and turn on the pressurized water pump to clean the inner pipe and the outer pipe.

[0023] In the use of the conveying device for cementing slurry according to the present invention, during normal material conveying, each first sealing cap is located in the first position to block the opening on the inner tube. The cementing slurry enters the conveying pump through the inlet and enters the inner tube through the outlet under the action of the conveying pump. The cementing slurry entering the inner tube fills the filling area through the outlet end of the inner tube.

[0024] When a blockage occurs between two adjacent openings on the inner tube, the pressure in that area of ​​the inner tube rises. The pressure gauge reading on the inner tube between the two blocked openings will then rise rapidly and exceed a first preset value. The location of the blockage can be quickly determined by observing the pressure change on the gauge. At this point, the first sealing cap adjacent to the left side of the blockage location is moved to a second position to open the opening. This allows the cementitious slurry entering the inner tube to pass through the opening before the blocked section into the annular channel, and then fill the area that needs filling through the annular channel. As the cementitious slurry fills the area through the annular channel, the blockage in the inner tube can be cleared, ensuring that the filling operation is uninterrupted even when the inner tube is blocked, without delaying subsequent operations, achieving continuous filling. This results in high filling and conveying efficiency for the cementitious slurry conveying device of this embodiment.

[0025] Therefore, the conveying device for cementing slurry in the embodiments of the present invention has the advantages of high conveying and filling efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a conveying device for cementing slurry according to an embodiment of the present invention.

[0027] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0028] Figure 3 This is a schematic diagram of the structure of the first sealing cover in the first position and the second sealing cover in the third position according to an embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of the structure of the first sealing cover in the second position and the second sealing cover in the fourth position according to an embodiment of the present invention.

[0030] Figure 5 This is a side view of a conveying device for cementing slurry according to an embodiment of the present invention.

[0031] Figure label:

[0032] 100 is a conveying device for cementitious slurry.

[0033] Feed pump 1;

[0034] Inner tube 2; Opening 201; First opening 2011; Second opening 2012;

[0035] Outer tube 3;

[0036] Circular channel 4;

[0037] Pressure gauge 5; First pressure gauge 501;

[0038] First sealing cap 6;

[0039] Second sealing cap 7;

[0040] Rotating shaft 8;

[0041] WS-9;

[0042] First driving component 10;

[0043] Second driving component 11; First fixing part 1101; First telescopic part 1102;

[0044] Third driving component 12; Second fixing part 1201; Second telescopic part 1202;

[0045] Cleaning and pressurizing device 13. Detailed Implementation

[0046] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0047] The technical solution of this application will now be described in detail with reference to the accompanying drawings.

[0048] like Figures 1 to 5As shown, the conveying device 100 for cementing slurry according to an embodiment of the present invention includes a conveying pump 1, an inner tube 2, an outer tube 3, a plurality of pressure gauges 5, and a plurality of first sealing caps 6. The conveying pump 1 has an inlet and an outlet. The inlet end of the inner tube 2 is connected to the outlet. The outer tube 3 is sleeved on the inner tube 2 and is spaced apart from the inner tube 2 in its radial direction so that an annular channel 4 is defined between the inner tube 2 and the outer tube 3. The inlet end of the outer tube 3 is sealed to the inner tube 2. The inner tube 2 has a plurality of openings 201 spaced apart along the axial direction of the inner tube 2.

[0049] At least one pressure gauge 5 is provided between two adjacent openings 201. The pressure gauge 5 has a probe, which is placed inside the inner tube 2 to monitor the pressure in the inner tube 2. At least one first sealing cap 6 is provided at each opening 201. The position of the first sealing cap 6 is adjustablely connected to the inner tube 2 so that the first sealing cap 6 can switch between a first position and a second position. In the first position, the first sealing cap 6 is fitted onto the opening 201 to seal the opening 201. In the second position, the first sealing cap 6 is separated from the opening 201.

[0050] To make the technical solution of this application easier to understand, the following description further illustrates the technical solution of this application, taking the example that the axial direction of the inner tube 2 is consistent with the left and right directions, where the left and right directions are as follows: Figures 1 to 4 As shown.

[0051] For example, such as Figures 1 to 5 As shown, the left end of the inner tube 2 is connected to the left end of the outer tube 3 via a flange, and the connection is sealed with a sealing strip. Both the inner tube 2 and the outer tube 3 are made of wear-resistant steel. The length of the inner tube 2 matches the length of the outer tube 3, and the inner diameter of the inner tube 2 is reasonably selected according to the pressure and flow rate requirements of the feed pump 1. A pressure gauge 5 is installed between two adjacent openings 201. Each opening 201 has two symmetrically distributed first sealing caps 6. The first sealing caps 6 are arc-shaped and fit the outer wall surface of the inner tube 2 so that the first sealing caps 6 can be installed on the opening 201.

[0052] In the use of the conveying device 100 for cementing slurry according to an embodiment of the present invention, during normal material conveying, each first sealing cap 6 is located in a first position to block the opening 201 on the inner tube 2 (e.g., Figure 3 As shown, the cementing slurry enters the feed pump 1 through the feed inlet, and under the action of the feed pump 1, it enters the inner tube 2 through the discharge outlet. The cementing slurry entering the inner tube 2 fills the filling area through the outlet end of the inner tube 2.

[0053] When a blockage occurs between two adjacent openings 201 on the inner tube 2, the pressure in the inner tube 2 at that location will rise. The pressure gauge 5 on the inner tube 2 between the two blocked openings 201 will then rise rapidly and exceed a first preset value. The location of the blockage can be quickly determined by observing the pressure change on the pressure gauge 5. At this point, the first sealing cap 6 adjacent to the left side of the blockage location in the inner tube 2 is moved to a second position (e.g.,...). Figure 4 As shown, the opening 201 is opened here, allowing the cementitious slurry entering the inner pipe 2 to enter the annular channel 4 through the opening 201 before the blockage section, and then fill the area to be filled through the annular channel 4. While the cementitious slurry is filling the area through the annular channel 4, the blockage in the inner pipe 2 can be cleared, ensuring that the filling operation is not interrupted even when the inner pipe 2 is blocked, and that subsequent operations are not delayed, thus achieving continuous filling. This results in high filling and conveying efficiency for the cementitious slurry conveying device 100 of this embodiment.

[0054] Therefore, the conveying device 100 for cementing slurry of the present invention has the advantages of high conveying and filling efficiency.

[0055] In some embodiments, the conveying device 100 for cementing slurry of the present invention further includes a rotating shaft 8, a first driving member 10, and a plurality of turbine fans 9. At least a portion of the rotating shaft 8 is disposed inside the inner tube 2, and the axis of the rotating shaft 8 coincides with the axis of the inner tube 2. The rotating shaft 8 is rotatably connected to the inner tube 2. The first driving member 10 is drively connected to the rotating shaft 8 to drive the rotating shaft 8 to rotate. The plurality of turbine fans 9 are spaced apart along the axial direction of the rotating shaft 8.

[0056] For example, such as Figures 1 to 5 As shown, the length of the rotating shaft 8 is adapted to the length of the inner tube 2. The turbofan 9 is shaped like a fan blade and is made of high-strength wear-resistant material. During normal conveying of the cementing slurry, the rotating blades of the turbofan 9 compress and pressurize the cementing slurry in the inner tube 2, thereby conveying it to the rear of the turbofan 9 and providing a certain power for the conveyed cementing slurry. The first driving component 10 can be a servo motor or a stepper motor. The output shaft of the first driving component 10 is connected to the rotating shaft 8 through a coupling to drive the rotating shaft 8 to rotate.

[0057] Specifically, when the cementitious slurry is being normally transported within the inner tube 2, the rotating shaft 8 drives the turbine fan 9 to rotate at a relatively low speed to provide auxiliary power to the cementitious slurry. This not only helps reduce the risk of blockage of the cementitious slurry within the inner tube 2 but also improves the transport efficiency of the cementitious slurry. When blockage occurs in the inner tube 2, the output power of the first driving component 10 is increased to increase the rotational speed of the turbine fan 9. The rotation of the turbine fan 9 serves as the primary force to clear the blockage of the cementitious slurry in the inner tube 2.

[0058] Therefore, the conveying device 100 for cementing slurry in this embodiment of the invention can automatically handle pipeline blockage by setting a rotating shaft 8 and a turbine fan 9, without the need to disassemble the pipe for unblocking, saving a lot of manpower and material resources, and thus saving costs.

[0059] In some embodiments, the conveying device 100 for cementing slurry of the present invention further includes a plurality of second sealing caps 7, each opening 201 having at least one second sealing cap 7. The second sealing cap 7 is positionally connected to the inner tube 2 so that the second sealing cap 7 can switch between a third position and a fourth position. In the third position, the second sealing cap 7 is fitted onto the opening 201 and cooperates with the first sealing cap 6 to block the opening 201. In the fourth position, the second sealing cap 7 is separated from the opening 201, and the second sealing cap 7 blocks the rear section of the inner tube 2 corresponding to the opening 201.

[0060] For example, such as Figures 1 to 4 As shown, each opening 201 is provided with two symmetrically arranged second sealing caps 7. The second sealing caps 7 are arc-shaped and fit the outer wall surface of the inner tube 2, so that the first sealing cap 6 can be installed on the opening 201. When the inner tube 2 is conveying materials normally, the second sealing caps 7 are in the third position (e.g., Figure 3 As shown), the second sealing cap 7 and the first sealing cap 6 are sealed together to seal the opening 201. When the inner tube 2 becomes blocked, the second sealing cap 7 adjacent to the left side of the blocked location of the inner tube 2 is moved to the fourth position (as shown). Figure 4 As shown), the inner pipe 2 of the rear section is blocked to prevent the cementitious slurry delivered by the feed pump 1 to the inner pipe 2 from continuing to squeeze the blocked section of the inner pipe 2 backward, thereby avoiding a sudden increase in pressure in the blocked section of the inner pipe 2 and causing a safety accident. This is beneficial to improving the safety of the conveying device 100 for cementitious slurry in this embodiment of the invention.

[0061] Optionally, the conveying device 100 for cementing slurry in this embodiment of the invention further includes a second driving member 11. The second driving member 11 is disposed between the inner tube 2 and the outer tube 3. The second driving member 11 includes a first fixing part 1101 and a first telescopic part 1102. The first telescopic part 1102 is telescopic relative to the first fixing part 1101. The first fixing part 1101 is hinged to the inner tube 2. The first telescopic part 1102 is hinged to one end of the first sealing cover 6. The other end of the first sealing cover 6 is hinged to the inner tube 2. The second driving member 11 is used to drive the first sealing cover 6 to rotate so that the first sealing cover 6 can switch between a first position and a second position.

[0062] For example, such as Figures 1 to 5As shown, the second driving component 11 is a hydraulic telescopic rod. The first fixing part 1101 is located at the left end of the first telescopic part 1102. The left end of the first fixing part 1101 is hinged to the inner tube 2. The right end of the first telescopic part 1102 is hinged to one end of the first sealing cover 6. The left end of the first sealing cover 6 is hinged to the inner tube 2. By controlling the extension and retraction of the first telescopic part 1102, the first sealing cover 6 is driven to rotate, thereby facilitating the switching of the first sealing cover 6 between the first position and the second position. This makes the control of the first sealing cover 6 simple and the adjustment convenient.

[0063] Optionally, the conveying device 100 for cementing slurry in this embodiment of the invention further includes a third driving member 12. The third driving member 12 is disposed inside the inner tube 2. The third driving member 12 includes a second fixing part 1201 and a second telescopic part 1202. The second telescopic part 1202 is telescopic relative to the second fixing part 1201. The second fixing part 1201 is hinged to the inner tube 2. The second telescopic part 1202 is hinged to one end of the second sealing cover 7. The other end of the second sealing cover 7 is hinged to the inner tube 2. The third driving member 12 is used to drive the second sealing cover 7 to rotate so that the second sealing cover 7 switches between a third position and a fourth position.

[0064] For example, such as Figures 1 to 5 As shown, the third driving component 12 is a hydraulic telescopic rod. The second fixing part 1201 is located at the right end of the first telescopic part 1102. The right end of the second fixing part 1201 is hinged to the inner tube 2. The left end of the second telescopic part 1202 is hinged to one end of the second sealing cover 7. The right end of the second sealing cover 7 is hinged to the inner tube 2. By controlling the extension and retraction of the second telescopic part 1202, the second sealing cover 7 is driven to rotate, thereby facilitating the switching of the second sealing cover 7 between the third position and the fourth position. This makes the control of the first sealing cover 6 simple and the adjustment convenient.

[0065] In some embodiments, the conveying device 100 for cementing slurry of the present invention further includes a control system. Pressure gauges 5 are all connected to the control system to receive the pressure value of pressure gauges 5. The first drive member 10, the second drive member 11 and the third drive member 12 are all electrically connected and signal connected to the control system. When the inner tube 2 between two adjacent openings 201 is blocked, the pressure gauge 5 on the blocked section of the inner tube 2 exceeds a first preset value. The pressure gauge 5 transmits a first signal to the control system. The control system controls the first drive member 10 to increase the rotation speed of the rotating shaft 8 to clear the blocked section of the inner tube 2. The control system also controls the second drive member 11 to drive the first sealing cover 6 to the second position and controls the third drive member 12 to the fourth position.

[0066] Therefore, the conveying device 100 for cementing slurry of this embodiment of the invention uses a control system to determine and clear the blockage of the inner pipe 2. When the inner pipe 2 is blocked, the amount of manpower and resources required to clear the inner pipe 2 can be greatly reduced, making the conveying device 100 for cementing slurry of this embodiment of the invention highly automated and easy to control.

[0067] In some embodiments, the conveying device 100 for cementing slurry of the present invention further includes a cleaning and pressurizing device 13, which includes a pressurizing water pump and an air compressor. The outlet of the pressurizing water pump is connected to the inner pipe 2 and the annular channel 4 respectively for cleaning the inner pipe 2 and the outer pipe 3. The outlet of the air compressor is connected to the annular channel 4 for pressurizing the annular channel 4.

[0068] Understandably, before material conveying, water is pumped into the inner pipe 2 and the annular channel 4 using a pressurized water pump to lubricate the inner pipe 2 and the outer pipe 3, thereby reducing the risk of blockage during the material conveying process. During normal material conveying, compressed air is input into the annular channel 4 using an air compressor to increase the pressure within the annular channel 4. This provides auxiliary sealing for the first sealing cover 6, preventing excessive pressure in the inner pipe 2 from forcing open the first sealing cover 6 and affecting the normal conveying of the cementitious slurry. This improves the operational reliability of the cementitious slurry conveying device 100 of this embodiment of the invention.

[0069] In some embodiments, the ratio between the inner diameter of the outer tube 3 and the outer diameter of the inner tube 2 is 2-3.

[0070] For example, the ratio of the inner diameter of the outer tube 3 to the outer diameter of the inner tube 2 is in the range of 2.5. By reasonably setting the ratio between the inner diameter of the outer tube 3 and the outer diameter of the inner tube 2, the flow cross section of the inner tube 2 is approximately the same as the flow cross section of the annular channel 4. This prevents the cementitious slurry in the inner tube 2 from flowing into the annular channel 4 through the opening 201, and causing changes in flow rate and velocity due to changes in the flow cross section, thus affecting normal filling.

[0071] In some embodiments, the distance between two adjacent openings 201 is 1.5m-2m.

[0072] For example, the distance between two adjacent openings 201 is 1.5m. By reasonably setting the distance between two adjacent openings 201, the pressure gauge 5 is positioned relatively closely, which can quickly determine the location of the blockage in the inner tube 2 and prevent the determination of the location of the blockage in the inner tube 2 from being affected by the large distance between the two pressure gauges 5.

[0073] The control method for a conveying device for cementing slurry according to an embodiment of the present invention, the method being based on the conveying device 100 for cementing slurry described in any of the above embodiments, includes the following steps:

[0074] S1: Under normal use, such as Figure 3 As shown, the first sealing cover 6 is located in the first position, the second sealing cover 7 is located in the third position, the binder slurry is transported to the filling area through the inner tube 2, and the cleaning and pressurizing device 13 delivers compressed air into the annular channel 4 to play an auxiliary sealing role for the first sealing cover 6.

[0075] S2: As Figure 2 As shown, the pressure of the inner tube 2 is detected by pressure gauge 5. When the value of one of the pressure gauges 5 exceeds the first preset pressure value, the pressure gauge 5 that exceeds the first preset pressure value is the first pressure gauge 501. The two openings 201 adjacent to the first pressure gauge 501 are the first opening 2011 and the second opening 2012. The first opening 2011 is located closer to the inlet end of the inner tube 2 than the second opening 2012. The first pressure gauge 501 gives a first signal to the control system.

[0076] S3: As Figure 4 As shown, after receiving the first signal, the control system controls the first drive component 10 to increase the rotation speed of the rotating shaft 8 to clear the blockage in the inner tube 2. The control system also controls the second drive component 11 located at the first opening 2011 to drive the first sealing cover 6 to the second position and the control system controls the third drive component 12 located at the first opening 2011 to drive the second sealing cover 7 to the fourth position, so that the cementing slurry can be transported to the filling area through the annular channel 4 and the air compressor can be turned off.

[0077] S4: After the filling operation is completed, turn off the material pump 1 and turn on the pressurized water pump to clean the inner pipe 2 and the outer pipe 3.

[0078] Therefore, the control method of the conveying device 100 for cementing slurry of the present invention has the advantages of high conveying and filling efficiency.

[0079] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0081] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0082] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0083] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0084] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A conveying device for cementitious slurry, characterized in that, include: A feed pump having an inlet and an outlet; The inner tube and the outer tube are connected at the inlet end to the outlet. The outer tube is sleeved on the inner tube and spaced apart from the inner tube in its radial direction so that an annular channel is defined between the inner tube and the outer tube. The inlet end of the outer tube is sealed to the inner tube. The inner tube has multiple openings spaced apart along the axial direction of the inner tube. Multiple pressure gauges, with at least one pressure gauge positioned between two adjacent openings, each pressure gauge having a probe placed inside the inner tube to monitor the pressure within the inner tube; and Multiple first sealing caps are provided, with at least one first sealing cap at each opening. The first sealing cap is positionally connected to the inner tube so that it can switch between a first position and a second position. In the first position, the first sealing cap is fitted onto the opening to seal it. In the second position, the first sealing cap is separated from the opening. A rotating shaft and a first driving member, wherein at least a portion of the rotating shaft is disposed inside the inner tube and the axis of the rotating shaft coincides with the axis of the inner tube, the rotating shaft is rotatably connected to the inner tube, and the first driving member is drively connected to the rotating shaft to drive the rotating shaft to rotate; as well as Multiple turbofans are spaced apart on the rotating shaft along the axial direction of the rotating shaft; A plurality of second sealing caps are provided at least one second sealing cap at each of the openings. The second sealing caps are positionally adjustable to the inner tube so that the second sealing caps can be switched between a third position and a fourth position. In the third position, the second sealing cap is fitted onto the opening and cooperates with the first sealing cap to seal the opening. In the fourth position, the second sealing cap is separated from the opening and the second sealing cap seals the rear section of the inner tube corresponding to the opening. The second driving member is disposed between the inner tube and the outer tube. The second driving member includes a first fixed part and a first telescopic part. The first telescopic part is telescopic relative to the first fixed part. The first fixed part is hinged to the inner tube. The first telescopic part is hinged to one end of the first sealing cover. The other end of the first sealing cover is hinged to the inner tube. The second driving member is used to drive the first sealing cover to rotate so that the first sealing cover switches between the first position and the second position. The third driving member is disposed inside the inner tube and includes a second fixed part and a second telescopic part. The second telescopic part is telescopic relative to the second fixed part. The second fixed part is hinged to the inner tube. The second telescopic part is hinged to one end of the second sealing cover. The other end of the second sealing cover is hinged to the inner tube. The third driving member is used to drive the second sealing cover to rotate so that the second sealing cover switches between the third position and the fourth position.

2. The conveying device for cementing slurry according to claim 1, characterized in that, Also includes: The control system includes pressure gauges that are signal-connected to receive pressure values. The first, second, and third driving components are electrically and signal-connected to the control system. When the inner tube between two adjacent openings becomes blocked, the pressure gauge on the blocked section of the inner tube exceeds a first preset value. The pressure gauge transmits a first signal to the control system. The control system controls the first driving component to increase the rotational speed of the rotating shaft to clear the blocked section of the inner tube. The control system also controls the second driving component to drive the first sealing cover to the second position and controls the third driving component to the fourth position.

3. The conveying device for cementing slurry according to claim 2, characterized in that, It also includes a cleaning and pressurizing device, which includes a pressurizing water pump and an air compressor. The outlet of the pressurizing water pump is connected to the inner pipe and the annular channel respectively for cleaning the inner pipe and the outer pipe. The outlet of the air compressor is connected to the annular channel for pressurizing the annular channel.

4. The conveying device for cementing slurry according to claim 1, characterized in that, The ratio between the inner diameter of the outer tube and the outer diameter of the inner tube is 2-3.

5. The conveying device for cementing slurry according to claim 1, characterized in that, The distance between two adjacent openings is 1.5m-2m.

6. A control method for a conveying device for cementing slurry, the method being based on the conveying device for cementing slurry according to claim 3, characterized in that, Includes the following steps: S1: During normal use, the first sealing cover is located in the first position, the second sealing cover is located in the third position, the binder slurry is transported to the filling area through the inner tube, and the cleaning and pressurizing device delivers compressed air into the annular channel to assist in sealing the first sealing cover. S2: The pressure of the inner tube is detected by the pressure gauge. When the value of one of the pressure gauges exceeds the first preset pressure value, the pressure gauge that exceeds the first preset pressure value is the first pressure gauge. The two openings adjacent to the first pressure gauge are the first opening and the second opening. The first opening is located closer to the inlet end of the inner tube than the second opening. The first pressure gauge gives a first signal to the control system. S3: After receiving the first signal, the control system controls the first driving component to increase the rotation speed of the rotating shaft to clear the blockage in the inner tube. The control system also controls the second driving component located at the first opening to drive the first sealing cover to the second position and the control system controls the third driving component located at the first opening to drive the second sealing cover to the fourth position, so that the cementing slurry can be transported to the filling area through the annular channel and the air compressor can be turned off. S4: After the filling operation is completed, turn off the material pump and turn on the pressurized water pump to clean the inner pipe and the outer pipe.

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