Multi-screw pump grouting system and working method

Abstract

The multi-screw pump grouting system comprises a first screw pump set and a second screw pump set, the first screw pump set and the second screw pump set are connected with a power mechanism, a feeding port of the first screw pump set is connected with a feeding main pipe through a switching valve, a discharging port of the first screw pump set is connected to a discharging main pipe, and a discharging port of the second screw pump set is connected with a discharging main pipe. A feed port of the second screw pump set is connected to the feed header pipe, and a discharge port of the second screw pump set is connected to the discharge header pipe through a switching valve; the switching valve works to achieve switching between the parallel connection state and the series connection state of the first screw pump set and the second screw pump set, the grouting pump system is high in applicability, and the construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of grouting engineering, and particularly relates to a multi-screw pump grouting system and a working method thereof. Background Art

[0002] The statements herein only provide the background art related to the present invention and do not necessarily constitute the prior art.

[0003] A grouting pump is a special pump dedicated to grouting. The development of grouting pump technology is closely related to fields such as construction, civil engineering, and geological engineering, and is mainly used in scenarios such as foundation reinforcement, tunnel construction, and mine support. Traditional grouting pumps generally use piston pumps. When using a piston pump, its grouting flow rate is small. For some scenarios that require large-flow grouting, the piston pump cannot meet the grouting requirements. Currently, there are screw pumps. A screw pump relies on the volume change of the sealing cavity formed by the screw and the bushing to suck in and discharge liquid. The characteristics of a screw pump are stable flow rate, small pressure pulsation, self-priming ability, low noise, high efficiency, long service life, and reliable operation. Its outstanding advantage is that it does not form eddies when transporting the medium and is not sensitive to the viscosity of the medium, and can transport high-viscosity media. However, the output slurry pressure of the screw pump is small, and for some grouting scenarios that require a larger pressure, the screw pump cannot meet the grouting requirements. To sum up, the application scenarios of single piston pumps and screw pumps are both limited to a certain extent, and the applicability is poor. During the actual grouting construction process, it is necessary to select a piston pump or a screw pump according to the engineering stage and geological condition changes and transport it to the target position for grouting, which prolongs the construction period and reduces the construction efficiency. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a multi-screw pump grouting system and a working method thereof, which can realize the grouting functions of large flow rate and high pressure with the same set of system, improve the applicability of the entire grouting system, improve the construction efficiency, and shorten the construction period.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a multi-screw pump grouting system, which includes a first screw pump group and a second screw pump group. The first screw pump group and the second screw pump group are connected to a power mechanism. The feed inlet of the first screw pump group is connected to a feed main pipe through a switching valve, and its discharge outlet is connected to a discharge main pipe. The feed inlet of the second screw pump group is connected to the feed main pipe, and its discharge outlet is connected to the discharge main pipe through a switching valve;

[0007] The operation of the switching valve can realize the switching between the parallel and series states of the first screw pump group and the second screw pump group.

[0008] Optionally, the switching valve is a two-position four-way solenoid valve, which has a left position and a right position. When it works in the left position, the feed port of the first screw pump group is communicated with the feed main pipe, and the discharge port of the second screw pump group is communicated with the discharge main pipe. When it works in the right position, the discharge port of the second screw pump group is communicated with the feed port of the first screw pump group through the switching valve.

[0009] Optionally, the first screw pump group includes at least one screw pump. When the first screw pump group includes multiple screw pumps, the multiple screw pumps are arranged in series.

[0010] Optionally, the screw pump in the first screw pump group is a variable-frequency screw pump.

[0011] Optionally, the second screw pump group includes at least one screw pump. When the second screw pump group includes multiple screw pumps, the multiple second screw pumps are arranged in series.

[0012] Optionally, the screw pump in the second screw pump group is a variable-frequency screw pump.

[0013] Optionally, the power mechanism includes a rotation driving assembly, and the rotation driving assembly is connected to the input shafts of the first screw pump group and the second screw pump assembly through a transmission mechanism.

[0014] Optionally, the transmission mechanism is a gear transmission mechanism. The output shaft of the rotation driving assembly is connected to the driving gear, and the output shafts of the screw pumps of the first screw pump group and the second screw pump group are connected with driven gears meshing with the driving gear.

[0015] Furthermore, the diameter of the driving gear is smaller than that of the driven gear.

[0016] Optionally, it further includes a frame body. The power mechanism is fixed to one end of the frame body through a power mechanism bracket. The first screw pump group and the second screw pump group are fixed to the frame body through screw pump brackets. The switching valve is fixed to the frame body.

[0017] In a second aspect, an embodiment of the present invention provides a working method for a multi-screw pump grouting system:

[0018] The switching valve works to communicate the feed port of the first screw pump group with the feed main pipe, and the discharge port of the second screw pump group with the discharge main pipe. The first screw pump group and the second screw pump group are arranged in parallel. A part of the slurry input from the feed main pipe enters the first screw pump group through the switching valve, and the other part directly enters the second screw pump group. The slurry output by the first screw pump group enters the discharge main pipe, and the slurry output by the second screw pump group enters the discharge main pipe through the switching valve group. The slurry output by the first screw pump group and the second screw pump group enters the discharge main pipe and is then sent out for grouting.

[0019] The switching valve operates to connect the outlet of the first screw pump unit and the inlet of the second screw pump unit. The first screw pump unit and the second screw pump unit are arranged in series. After the inlet of the second screw pump unit receives the slurry sent by the feed main pipe, the slurry is sent to the first screw pump unit, and after being pressurized by the first screw pump unit, the slurry is sent out through the discharge main pipe for grouting.

[0020] The beneficial effects of the present invention are as follows:

[0021] The grouting system of the present invention is provided with a first screw pump unit and a second screw pump unit, and is also provided with a switching valve. Through the switching valve, the switching between the parallel and series states of the first screw pump unit and the second screw pump unit can be realized. When a large grouting flow rate is required, the switching valve can be used to make the first screw pump unit and the second screw pump unit operate in parallel, and the two screw pump units output slurry in parallel, increasing the grouting flow rate and meeting the requirement of a large grouting flow rate. When a large grouting pressure is required, the switching valve can be used to make the first screw pump unit and the second screw pump unit operate in series, and the slurry is sent out after being pressurized by two-stage screw pump units, with a large grouting pressure, meeting the grouting requirement under a large slurry pressure. Therefore, the same set of system meets the grouting requirements under various working conditions, the applicability of the whole system is strong. During actual construction, only one set of system is needed, without the need to transport multiple sets of grouting equipment, shortening the construction period and improving the construction efficiency. Description of the Drawings

[0022] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0023] Figure 1 It is the system schematic diagram of Embodiment 1 of the present invention;

[0024] Figure 2 It is the overall structure schematic diagram of Embodiment 1 of the present invention Figure 1 ;

[0025] Figure 3 It is the overall structure schematic diagram of Embodiment 1 of the present invention Figure 2 ;

[0026] Figure 4 It is the sectional view of the switching valve of Embodiment 1 of the present invention;

[0027] Among them, 1. First feed branch pipe, 2. Feed main pipe, 3. First discharge branch pipe, 4. Discharge main pipe, 5. Second feed branch pipe, 6. Second discharge branch pipe, 7. First screw pump, 8. Second screw pump, 9. Slurry pipeline, 10. Third screw pump, 11. Fourth screw pump, 12. Slurry pipeline, 13. Two-position four-way solenoid valve, 14. Rotating drive element, 15. Gearbox, 16. Frame, 17. Control cabinet, 18. Screw pump support;

[0028] 13-1. Valve body, 13-2. Valve cavity, 13-3. Valve stem, 13-4. Annular protrusion, 13-5. First space, 13-6. Second space, 13-7. Third space, 13-8. Fourth space, 13-9. First spool valve, 13-10. Second spool valve. Detailed implementation mode

[0029] Embodiment 1

[0030] This embodiment provides a multi-screw pump grouting system, as Figures 1 - 3 shown, including a first screw pump group and a second screw pump group. The input shafts of the first screw pump group and the second screw pump group are both connected to a power mechanism, and the power mechanism can drive multiple screw pumps in the first screw pump group and the second screw pump group to work synchronously.

[0031] The feed inlet of the first screw pump group is connected to one end of the first feed branch pipe 1, the other end of the first feed branch pipe 1 is connected to a switching valve, and the switching valve is connected to the discharge end of the feed main pipe 2. The discharge outlet of the first screw pump group is connected to one end of the first discharge branch pipe 3, and the other end of the first discharge branch pipe 3 is connected to the discharge main pipe 4.

[0032] The feed inlet of the second screw pump group is connected to one end of the second feed branch pipe 5, the other end of the second feed branch pipe 5 is connected to the feed main pipe 2, the discharge outlet of the second screw pump group is connected to one end of the second discharge branch pipe 6, and the other end is connected to the switching valve. The switching valve is connected to the feed end of the discharge main pipe 4.

[0033] The first screw pump group is provided with at least one screw pump. In this embodiment, the first screw pump group adopts two screw pumps arranged in series, namely the first screw pump 7 and the second screw pump 8. The feed inlet of the first screw pump 7 serves as the feed inlet of the first screw pump group and is connected to the switching valve through the first feed branch pipe 1. The discharge outlet of the first screw pump 7 is connected to the feed inlet of the second screw pump 8 through the slurry pipeline 9. The discharge outlet of the second screw pump 8 serves as the discharge outlet of the first screw pump group and is connected to the discharge main pipe 4 through the first discharge branch pipe 3.

[0034] It can be understood that those skilled in the art can set the number of screw pumps in the first screw pump group according to actual needs, and no detailed description will be given here.

[0035] Preferably, the screw pumps in the first screw pump group all adopt existing variable-frequency screw pumps, and the variable-frequency screw pumps can adjust the rotation speed of the power mechanism through a variable-frequency control system to achieve precise control of the grouting volume.

[0036] The second screw pump group is provided with at least one screw pump. In this embodiment, the second screw pump group is provided with two screw pumps, namely a third screw pump 10 and a fourth screw pump 11. The third screw pump 10 and the fourth screw pump 11 are arranged in series, that is, the discharge port of the third screw pump 10 is connected to the feed port of the fourth screw pump 11 through the slurry pipeline 12.

[0037] The feed port of the third screw pump 10 serves as the feed port of the second screw pump assembly, and the feed port of the third screw pump 10 is connected to the second feed branch pipe 5 ; the discharge port of the fourth screw pump 11 serves as the discharge port of the second screw pump assembly, and the discharge port of the fourth screw pump is connected to the second discharge branch pipe 6 .

[0038] In this embodiment, the switching valve is a two-position four-way solenoid valve 13, which is connected to the control system and can receive instructions from the control system to work.

[0039] The two-position four-way solenoid valve 13 can be an existing device, and has a left position and a right position when working. The switching between the left position and the right position can be controlled by a control system.

[0040] When the two-position four-way solenoid valve 13 works in the left position, the feed main pipe 2 is connected to the feed port of the first screw pump 7 through the two-position four-way solenoid valve and the first feed branch pipe 1, and the discharge port of the fourth screw pump 11 is connected to the discharge main pipe 4 through the second discharge branch pipe 6 and the two-position four-way solenoid valve 13. At this time, the first screw pump group and the second screw pump group are in parallel state, and grouting can be performed at a larger flow rate. Increasing the grouting flow rate can ensure that the slurry covers a large area of ​​strata or structures, and is used in projects such as soft soil foundation reinforcement, improving foundation stability and bearing capacity, and reducing the risk of deformation or damage to buildings. It can meet projects with high requirements for grouting volume, such as mine filling grouting, tunnel lining back grouting, etc., can prevent surface collapse, ensure that the lining fits the surrounding rock, etc.

[0041] When the two-position four-way solenoid valve 13 is working in the right position, the discharge port of the fourth screw pump 11 is connected to the feed port of the first screw pump 7 through the second discharge branch pipe 6 and the first feed branch pipe 1. At this time, the four screw pumps of the first screw pump group and the second screw pump group are in a series state, and the slurry can be pressurized in four stages by four screw pumps, thereby outputting slurry with a larger pressure. Increasing the grouting pressure is helpful for grouting in deep formations, and can make the slurry penetrate into the formation to fill pores and cracks, improve the density and anti-seepage performance of the formation, and be used for projects such as deep foundation pit water-stop curtains. In addition, higher grouting pressure can break through the formation resistance in complex geological areas, make the slurry evenly distributed, and solve the problem of uneven grouting caused by complex geology. It is suitable for multi-layer strata with different permeability or areas with developed rock cracks. Increasing the grouting pressure can speed up the slurry injection speed, shorten the grouting construction time, and improve the construction efficiency of large-scale grouting projects.

[0042] All four screw pumps are connected to the power mechanism, and the power mechanism includes a rotational driving element 14. The rotational driving element 14 is connected to the output shafts of the four screw pumps through a transmission mechanism.

[0043] In this embodiment, the rotational driving element 14 includes a motor. The output shaft of the motor is connected to a speed reducer, and the output shaft of the speed reducer is connected to the input shafts of the four screw pumps through a transmission mechanism. In this embodiment, the speed reducer converts the high-speed and low-torque rotation of the motor into a low-speed and high-torque output. This process reduces the rotational speed while increasing the torque, meeting the requirements of the grouting operation, improving the transmission efficiency, and achieving high-efficiency transmission.

[0044] The transmission mechanism adopts a gear transmission mechanism, which includes a driving gear fixed on the output shaft of the speed reducer, and a driven gear fixed on the input shaft of the screw pump. All four driven gears are engaged with the driving gear to achieve power transmission.

[0045] Further, the housing of the speed reducer is made of Q235-A material, which has sufficient strength and rigidity to support the operation of the entire speed reducer. The output shaft of the speed reducer is made of 40Cr material and is quenched and tempered to HB260-300 to ensure its stability and durability under high loads. The output shaft of the speed reducer is connected to the driving gear to transmit power.

[0046] Further, the driving gear and the driven gears are made of 40Cr material and are quenched and tempered to HB260-300 to improve their load-bearing capacity and wear resistance. The tooth surfaces of each gear are carburized to a depth of 0.8-1.2 mm, with a surface hardness of HRC45-55 and a core hardness of HRC30-40 to enhance their wear resistance and impact resistance.

[0047] Further, the input shafts of the screw pumps are made of 20CrMnTi material, which has excellent anti-fatigue performance.

[0048] In this embodiment, the diameter of the driving gear is smaller than that of the driven gears to achieve speed reduction transmission and meet the requirements of grouting.

[0049] Both the driving gear and the driven gears are located inside the gearbox 15, and the gearbox 15 protects the gears.

[0050] The grouting system of this embodiment further includes a frame 16. The frame 16 adopts a rectangular frame structure and is composed of multiple steel beams welded together, which is used to carry equipment such as multiple screw pumps, the gearbox 15, and the power mechanism.

[0051] One end of the frame body 16 is provided with a rotation driving element 14. The motor and the speed reducer are both fixed at the front end of the frame body 16. A gantry is further arranged on the frame body 16. The gantry is arranged across the rotation driving element 14. A control cabinet 17 is installed at the top of the gantry. A control system is installed in the control cabinet 17. The control system is connected to each screw pump, motor and switching valve to control the operation of the screw pump, motor and switching valve.

[0052] A gear box 15 is arranged in front of the speed reducer. A driving gear and a driven gear meshing with the driving gear are arranged in the gear box 15. Each driven gear is connected with an output shaft. The output shaft drives the input shaft of the screw pump to rotate through a coupling.

[0053] The first screw pump group and the second screw pump group are arranged in parallel side by side on the frame body 16. The first screw pump 7 and the second screw pump 8 are arranged vertically, and the first screw pump 7 is located below the second screw pump 8. The third screw pump 10 and the fourth screw pump 11 are arranged vertically, and the third screw pump 10 is located below the fourth screw pump 11. The four screw pumps are fixedly connected with the frame body 16 through screw pump brackets 18. Therefore, the axes of the four screw pumps are arranged in a square. By adopting this setting method, the space occupied by the four screw pumps in the horizontal direction is reduced, and further the space occupied by the whole system in the horizontal direction is reduced, improving the adaptability of the grouting pump system to the environment.

[0054] The two-position four-way solenoid valve 13 is fixed on one side of the frame body 16 and is on the same side as the second screw pump group.

[0055] In this embodiment, as Figure 4 shown, the two-position four-way solenoid valve 13 includes a valve body 13-1. A valve cavity 13-2 is arranged in the valve body 13-1. The valve cavity 13-2 is coaxially arranged with the valve body 13-1 and penetrates through the valve body 13-1 along the length direction. A valve rod 13-3 is coaxially arranged in the valve cavity 13-2. The valve rod 13-3 is slidably connected with the valve body 13-1. The valve rod 13-3 can move along its own axis.

[0056] Three annular protrusions 13-4 are arranged in the valve cavity to divide the space in the valve cavity 13-2 into a first space 13-5, a second space 13-6, a third space 13-7 and a fourth space 13-8 in sequence. A first valve core 13-9 is arranged in the middle of the valve rod 13-3. A second valve core 13-10 is arranged at one end close to the fourth space 13-8. The first valve core 13-9 and the second valve core 13-10 can be in sealing contact with the annular boss.

[0057] One side of the valve body is provided with two interfaces communicating with the valve cavity. One interface is connected to the feed main pipe 2, and the other interface is connected to the discharge main pipe 4. The feed main pipe 2 communicates with the fourth space 13-8, and the discharge main pipe 4 communicates with the first space 13-5. The other side of the valve body 13-1 is provided with three interfaces. Among them, two interfaces respectively correspond to two regions separated by the three annular protrusions 13-4. Among these two interfaces, one interface is connected to the second discharge branch pipe 6, and the second discharge branch pipe 6 communicates with the second space 13-6. The other interface is connected to the first feed branch pipe 1, and the first feed branch pipe communicates with the third space 13-7. The third interface is connected to the first discharge branch pipe 3, and the first discharge branch pipe 3 is connected to the first space 13-5. Since the third interface and the interface connected to the discharge main pipe 4 are always kept in communication, it is equivalent that the first discharge branch pipe 3 is in communication with the discharge main pipe 4.

[0058] When the two-position four-way solenoid valve 13 is in the left position, the first valve core 13-9 is in sealing fit with the middle annular protrusion. At this time, the second discharge branch pipe 6 and the discharge main pipe 4 are conducted through the first space 13-5 and the second space 13-6 of the valve cavity 13-2, and the feed main pipe 2 and the first feed branch pipe 1 are conducted through the third space 13-7 and the fourth space 13-8 of the valve cavity 13-2.

[0059] When the two-position four-way solenoid valve is in the right position, the valve rod 13-3 moves, the first valve core 13-9 is in sealing fit with the annular protrusion 13-4 between the first space 13-5 and the second space 13-6, and the second valve core 13-10 is in sealing fit with the annular protrusion 13-4 between the third space 13-7 and the fourth space 13-8. At this time, the second discharge branch pipe 6 and the first feed branch pipe 1 are conducted through the valve cavity.

[0060] The movement away of the valve rod can adopt the existing technology and will not be described in detail here.

[0061] Further, the feed ports of the first screw pump 7 and the second screw pump 8 are arranged in the outer direction away from the second screw pump group, and the discharge ports of the third screw pump 10 and the fourth screw pump 11 are arranged in the outer direction away from the first screw pump group. The outlets of the four screw pumps are all arranged in the rear direction. By adopting this setting method, it is convenient for the layout of the pipelines between the screw pumps and between the screw pumps and the switching valve.

[0062] The four screw pumps described above all adopt existing variable-frequency screw pumps, including components such as valve bodies, valve cores, stators, rotors, main shafts, and bearing boxes. Among them, the valve body is the core component of the screw pump and is made of 40Cr material and is quenched and tempered to HRC32-36 to improve its strength and wear resistance. Multiple channels are provided inside the valve body to control the flow of the slurry.

[0063] The spool valve is a component used in conjunction with the valve body. It is made of 40Cr material and undergoes quenching and tempering treatment to HRC26 - 30 to ensure its stability under high pressure. The spool valve moves inside the valve body to control the flow of the slurry.

[0064] The stator is another important component of the pump head. It is made of natural rubber material and has excellent elasticity and wear resistance. The stator cooperates with the rotor to form the core part of the screw pump.

[0065] The rotor is made of 40Cr material, undergoes quenching and tempering treatment to HRC30 - 34, and is plated with hard chromium on the surface to improve its wear resistance and corrosion resistance. The rotor is a single - head eccentric screw, which meshes with the double - helical surface of the stator (12) to form multiple sealed cavities, pushing the slurry from the suction end to the discharge end.

[0066] The main shaft is made of 40Cr material, undergoes quenching and tempering treatment to HB260 - 300, and is plated with hard chromium on the surface to improve its wear resistance and corrosion resistance. The main shaft supports the rotation of the rotor and transmits power.

[0067] The bearing housing is a component that supports the main shaft. It is made of gray cast iron HT250 material and has excellent load - bearing capacity and wear resistance. Bearings are installed inside the bearing housing to ensure the smooth operation of the main shaft.

[0068] An existing variable - frequency screw pump can be used for the screw pump, and its specific structure will not be described in detail here.

[0069] With the grouting system of this embodiment, through the switching valve, the switching between the parallel and series states of the first screw pump group and the second screw pump group can be achieved. When a larger grouting flow rate is required, the switching valve can be used to make the first screw pump group and the second screw pump group operate in parallel. The two screw pump groups output slurry in parallel, increasing the grouting flow rate and meeting the requirement of a larger grouting flow rate. When a larger grouting pressure is required, the switching valve can be used to make the first screw pump group and the second screw pump group operate in series. The slurry is pressurized and sent out through two - stage screw pump groups, and the grouting pressure is high, meeting the grouting requirement under a larger slurry pressure. Therefore, the same set of system meets the grouting requirements under various working conditions, the applicability of the entire system is strong. During actual construction, only one set of system is needed, without the need to transport multiple sets of grouting equipment, shortening the construction period and improving the construction efficiency.

[0070] Embodiment 2

[0071] This embodiment provides a working method for the multi - screw pump grouting system described in Embodiment 1:

[0072] The two-position four-way solenoid valve 13 is switched to the left position. At this time, the first feed branch pipe 1 is communicated with the feed main pipe 2 through the valve cavity of the two-position four-way solenoid valve 13, and the second discharge branch pipe 6 is communicated with the discharge main pipe 4 through the valve cavity of the two-position four-way solenoid valve 13. At this time, the first screw pump group and the second screw pump group are in parallel. The motor works, and the four screw pumps work. The slurry in the feed main pipe 2 is divided in the feed main pipe 2. A part of the slurry enters the inlet of the third screw pump 10 through the second feed branch pipe 5. After being pressurized by the third screw pump 10 and the fourth screw pump 11, the slurry enters the discharge main pipe 4. Another part of the slurry enters the inlet of the first screw pump 7 through the two-position four-way solenoid valve 13. The first screw pump 7 and the second screw pump 8 pressurize the slurry and then send the slurry into the first discharge branch pipe 3. Then the slurry enters the discharge main pipe 4, and the discharge main pipe 4 sends out the slurry for grouting.

[0073] The two-position three-way solenoid valve 13 is switched to the right position. At this time, the second discharge branch pipe 6 is communicated with the first feed branch pipe 1. The slurry flows through the feed main pipe 2, the second feed branch pipe 5, the third screw pump 10, the fourth screw pump 11, the valve cavity of the two-position four-way solenoid valve 13, the first feed branch pipe 1, the first screw pump 7, the second screw pump 8, and the first discharge branch pipe 3 in sequence and then enters the discharge main pipe 4, and is sent out through the discharge main pipe 4 for grouting. During the flow process of the slurry, it is sent out after being pressurized four times by the four screw pumps.

[0074] In this embodiment, the series and parallel combination modes of the first screw pump group and the second screw pump group can be flexibly adjusted according to the engineering requirements. In the early stage of grouting, the first screw pump group and the second screw pump group work in parallel to quickly fill large pores. In the later stage of grouting, the first screw pump group and the second screw pump group are connected in series to increase the pressure to improve the effect depth and density, adapting to the changes in the engineering stage and geological conditions.

[0075] The grouting system of this embodiment can realize the switching between high-pressure grouting and large-flow grouting. High-pressure grouting only means that when the grouting system of this embodiment adopts the series mode, the grouting pressure is higher than that of a single screw pump, and the specific grouting pressure value is not limited. Large flow only means that when the grouting system of this embodiment adopts the parallel mode, the grouting flow rate is higher than that of a single screw pump, and the specific grouting flow rate is not limited.

[0076] The above description is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-screw pump grouting system, characterized in that, It includes a first screw pump group and a second screw pump group. The first screw pump group and the second screw pump group are connected to a power mechanism. The feed inlet of the first screw pump group is connected to a feed main pipe through a switching valve, and its discharge outlet is connected to a discharge main pipe. The feed inlet of the second screw pump group is connected to the feed main pipe, and its discharge outlet is connected to the discharge main pipe through a switching valve; The operation of the switching valve can realize the switching between the parallel and series states of the first screw pump group and the second screw pump group.

2. The multi-screw pump grouting system according to claim 1, characterized in that, The switching valve adopts a two-position four-way solenoid valve, which has a left position and a right position. When in the left position, the feed inlet of the first screw pump group is communicated with the feed main pipe, and the discharge outlet of the second screw pump group is communicated with the discharge main pipe. When in the right position, the discharge outlet of the second screw pump group is communicated with the feed inlet of the first screw pump group through the switching valve.

3. The multi-screw pump grouting system according to claim 1, characterized in that, The first screw pump group includes at least one screw pump. When the first screw pump group includes multiple screw pumps, the multiple screw pumps are arranged in series.

4. The multi-screw pump grouting system according to claim 3, wherein, The screw pump in the first screw pump group adopts a variable-frequency screw pump.

5. The multi-screw pump grouting system according to claim 1, characterized in that, The second screw pump group includes at least one screw pump. When the second screw pump group includes multiple screw pumps, the multiple second screw pumps are arranged in series.

6. The multi-screw pump grouting system according to claim 5, wherein The screw pump in the second screw pump group adopts a variable-frequency screw pump.

7. The grouting system of a multi-screw pump according to claim 1, characterized in that, The power mechanism includes a rotation driving assembly, and the rotation driving assembly is connected to the input shafts of the first screw pump group and the second screw pump assembly through a transmission mechanism.

8. The multi-screw pump grouting system according to claim 7, characterized in that, The transmission mechanism adopts a gear transmission mechanism. The output shaft of the rotation driving assembly is connected to a driving gear, and the output shafts of the screw pumps of the first screw pump group and the second screw pump group are connected with driven gears meshing with the driving gear; Furthermore, the diameter of the driving gear is smaller than the diameter of the driven gear.

9. The grouting system of a multi-screw pump according to claim 1, characterized in that, It further includes a frame body. The power mechanism is fixed at one end of the frame body through a power mechanism support. The first screw pump group and the second screw pump group are fixed on the frame body through screw pump supports, and the switching valve is fixed on the frame body.

10. A working method of the multi-screw pump grouting system according to any one of claims 1-9, characterized in that: The switching valve works to communicate the feed inlet of the first screw pump group with the feed main pipe, and the discharge outlet of the second screw pump group with the discharge main pipe. The first screw pump group and the second screw pump group are arranged in parallel. A part of the slurry input from the feed main pipe enters the first screw pump group through the switching valve, and the other part directly enters the second screw pump group. The slurry output by the first screw pump group enters the discharge main pipe, and the slurry output by the second screw pump group enters the discharge main pipe through the switching valve group. The slurries output by the first screw pump group and the second screw pump group enter the discharge main pipe and are then sent out for grouting; The switching valve works to communicate the discharge outlet of the first screw pump group with the feed inlet of the second screw pump group. The first screw pump group and the second screw pump group are arranged in series. The feed inlet of the second screw pump group receives the slurry sent from the feed main pipe and then sends the slurry to the first screw pump group. After being pressurized by the first screw pump group, the slurry is sent out through the discharge main pipe for grouting.

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