Electromagnetic shaftless pump for super high-rise concrete, push-belt compensation, staged full-load pumping method

Abstract

This invention discloses a method for pumping concrete to high-rise buildings using an electromagnetic shaftless pump with a push-type compensation system, comprising: placing a concrete feeder on the ground; sequentially connecting a delivery pipe and a grouting hose to the concrete feeder so that the grouting hose extends to the corresponding location on the high-rise building; activating the power components, pressure sensors, and speed sensors of each stage of the multi-stage booster device on the electromagnetic shaftless pump; using the monitoring data from the pressure and speed sensors to progressively adjust the rotational speed of the booster components on the multi-stage booster device; and pumping concrete to the corresponding location on the high-rise building using the concrete feeder; the rotational speed of the booster components on the multi-stage booster device needs to be calculated and compensated. The advantages of this invention are: continuous monitoring of the outlet pressure of the multi-stage booster device, cyclic compensation and adjustment of the blade speed to ensure that the pressure meets the requirements and remains stable.

Description

Technical Field

[0001] This invention relates to the technical field of ultra-high-rise concrete pumping pipeline transportation, and in particular to a method for ultra-high-rise concrete electromagnetic shaftless pump push-compensation step-by-step full-load pumping. Background Technology

[0002] With the development of urban construction, the number of super high-rise buildings is increasing, and the challenges of vertical transportation of building materials in super high-rise construction are becoming increasingly severe. Besides the issue of concrete mix proportions, the main technical difficulties in pumping concrete in super high-rise buildings stem from the conveying capacity of the concrete pumping equipment and pipelines. When the building height reaches 300m or even 500m or more, concrete pumping becomes increasingly difficult. Furthermore, the construction of super high-rise buildings typically uses high-strength, high-performance concrete, and the increased strength of the concrete material further intensifies the challenges to the pumping system. If the pumping system is not properly configured during construction, pipe blockages are highly likely; or if the pumping pressure does not meet the height requirements, it will cause construction to stop and incur high costs. Therefore, the performance of the selected pumping equipment, the layout of the pumping system, and related operating procedures are crucial for achieving ultra-high pressure pumping.

[0003] In conventional super high-rise construction projects, ultra-high pressure pumps and relay pumping methods are commonly used. For example, patent number CN115680285A, "A Super High-Rise Concrete Pumping System and Construction Method," uses an ultra-high pressure pump set to provide enormous pressure for pumping concrete. Regarding relay pumping methods and devices, patent number CN 111622779 A, ​​"A Pulse-Type Pressure Compensation Long-Distance Concrete Conveying Device and its Usage Method," arranges several pneumatic booster pumps at intervals along the conveying pipeline. The air outlet pipes of the pneumatic booster pumps are connected to the conveying pipeline to compensate for the pressure loss during concrete transport, maintaining stable concrete pressure throughout the conveying pipeline and achieving long-distance concrete transport. Patent number CN 103541550 A, "A Construction Pumping System for Steel Pipe Concrete in Super High-Rise Buildings," connects a high-pressure pump to the discharge port and a low-pressure pump to the pouring hose, using a relay method between the two concrete pumps to achieve the pumping purpose for super high-rise buildings. Although existing technologies have solved some problems of insufficient pumping pressure and relay pumping of concrete in high-rise buildings, the following problems still exist: (1) For long-distance and ultra-high-rise pumping, the pressure of high-pressure pumps is high, the performance and cost of high-pressure pumps are high, the performance requirements of adjacent pressure pump pipelines are high, the equipment cost is increased, and the construction safety is low; (2) Traditional pressure pumps provide intermittent pumping pressure, which can easily cause blockage of the delivery pipeline; (3) Traditional pressure pumps have greater vibration and noise, which is not conducive to environmental protection; (4) Traditional pressure pumps cannot achieve multi-stage pressurization; (5) The pumping method for ultra-high-rise pouring is difficult to ensure stable pouring pressure, which affects the quality of pouring. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a method for pumping ultra-high-rise concrete using an electromagnetic shaftless pump with compensation in stages under full load. This method involves assembling an electromagnetic shaftless pump with a multi-stage pressurization device on the delivery pipe. In previous methods for pumping concrete in high-rise buildings, this electromagnetic shaftless pump with a multi-stage pressurization device has blades on its inner wall. Pressure sensors monitor pressure changes and determine the blade rotation speed in real time. A motor drives the bladed steel cylinder to rotate, and the high-speed rotating blades provide pressure to the concrete, achieving the pressurization purpose. Through multi-stage pressurization components, the concrete pumping pressure is gradually increased to full load, ensuring that the concrete pumping pressure meets requirements and guaranteeing the construction quality of the pouring. Simultaneously, pressure sensors monitor the concrete outlet pressure of the multi-stage pressurization components and cyclically adjust the compensation blade rotation speed in real time to ensure pressure stability. Furthermore, this electromagnetic shaftless pump with a multi-stage pressurization device is connected to the delivery pipe through buffer components to buffer the concrete pressure and pressurization impact load, ensuring the safety and stability of the delivery pipe.

[0005] The objective of this invention is achieved through the following technical solutions:

[0006] A method for pumping ultra-high-rise concrete using an electromagnetic shaftless pump with push-belt compensation in stages under full load, characterized in that the pumping method includes:

[0007] A concrete feeder is placed on the ground, and a delivery pipe and a grouting hose are connected to the concrete feeder in sequence so that the grouting hose extends to the corresponding location of the high-rise building.

[0008] The conveying pipe is equipped with an electromagnetic shaftless pump-driven multi-stage booster device, which includes a multi-stage booster assembly. The booster assembly includes a rotor assembly, a power assembly, a cylindrical protective cover, and a support end cover. The rotor assembly and the power assembly are both installed inside the cylindrical protective cover. The support end cover is located at both ends of the cylindrical protective cover. The rotor assembly includes a steel cylinder, an annular slider, blades, and a permanent magnet. The annular slider is located at both ends of the steel cylinder. The blades are arranged circumferentially along the inner wall of the steel cylinder. The permanent magnet is arranged circumferentially along the outer wall of the steel cylinder. The cylindrical protective cover is provided with an annular groove that cooperates with the annular slider. The rotating magnetic field generated by the power assembly drives the permanent magnet of the rotor assembly to rotate. A pressure sensor and a speed sensor are provided on the inner side of the support end cover.

[0009] The power component, pressure sensor, and speed sensor of the booster assembly on the electromagnetic shaftless pump multi-stage booster device are activated. The rotational speed of the booster assembly on the electromagnetic shaftless pump multi-stage booster device is adjusted step-by-step using the monitoring data from the pressure sensor and speed sensor. Concrete is then pumped to the corresponding location on the high-rise building via the concrete mixer. The booster value is determined based on the monitoring data, and the booster value is distributed to the electromagnetic shaftless pump multi-stage booster device using a step-by-step full-load boosting method. The aforementioned pressurizing components are used to determine the rotational speed of the pressurizing components on the multi-stage pressurizing device propelled by the electromagnetic shaftless pump. Here, step-by-step full-load pressurization means that the concrete is pressurized step by step by the pressurizing components on the multi-stage pressurizing device propelled by the electromagnetic shaftless pump. When the pressurization of the concrete by a certain stage of the pressurizing component reaches full load, the next stage of the pressurizing component continues to pressurize the concrete until the required pressurization value is reached. It is necessary to calculate and compensate for the rotational speed of the pressurizing components on the multi-stage pressurizing device propelled by the electromagnetic shaftless pump.

[0010] The method for calculating the rotational speed of the booster component in the electromagnetic shaftless pump-driven multi-stage booster device includes:

[0011] Let the length of the electromagnetic shaftless pump pushing the multi-stage booster device be ΔL, and it consists of j0 booster components, j=1, 2, 3, …j…j0, then the length of each booster component is δ=ΔL / j0;

[0012] Let the inner diameter of the booster assembly be d, the self-weight of the pumped concrete be γ, and g be the acceleration due to gravity.

[0013] The electromagnetic shaftless pump pushes a multi-stage booster device to pump concrete vertically upwards. The pressure loss Δp experienced by the concrete during pumping is determined by Δp Vc and Δp γ It consists of two parts, where Δp Vc It is the friction loss experienced by concrete as it flows within the pump pipe, including the resistance generated by the viscosity of the concrete and the frictional resistance generated by the flow of the concrete; Δp γ It is the pressure generated by the weight of concrete during vertical pumping, that is, the total pressure loss Δp of concrete pumped vertically upward in each stage of the booster assembly. FI for:

[0014] Δp FI =Δp Vc +Δp γ Formula 1;

[0015] If the pumped concrete is ordinary concrete, the pressure loss along the flow rate Δp per meter during vertical upward pumping is... Vcm for:

[0016]

[0017] where: Δp Vcm is the pressure loss per meter of concrete flow in the vertical conveying pipe; d is the diameter of the concrete conveying pipe; K1 is the adhesion coefficient; K2 is the velocity coefficient; S1 is the slump of the concrete; t2 / t1 is the ratio of the switching time of the concrete pump distribution valve to the time of the piston pushing the concrete. When the equipment performance is unknown, it can be taken as 0.30; v m is the average flow velocity of the concrete mixture in the conveying pipe; α is the ratio of the radial pressure to the axial pressure, and for ordinary concrete, it is taken as 0.90; β is the conversion coefficient. When d / 2 is 100, 125, and 150 mm respectively, β is taken as 3, 4, and 5;

[0018] The pressure Δp generated by the gravity of each meter of concrete during vertical pumping of concrete γm is:

[0019] Δp γm = γ Equation 3;

[0020] Substituting Equation 2 and Equation 3 into Equation 1, the total pressure loss Δp of the concrete vertically upward pumping in each stage of the booster assembly can be obtained FI is:

[0021]

[0022] The pressure p generated by the jth stage of the booster assembly on the pumped concrete w is:

[0023] p w = γv 2 / 2g = γ[v1 / (πnR / 30v0)] 2 / 2g Equation 5;

[0024] where: v is the flow velocity provided by the jth stage of the booster assembly for the concrete, v = v1 / (ωR / v0) = v1 / (πnR / 30v0); ω is the angular velocity of each stage of the booster assembly; n is the rotational speed; R is the blade radius; v0 is the tip speed; v1 is the root speed;

[0025] Suppose the electromagnetic shaftless pump drives a multi-stage booster device to require an output concrete pressure of p eh , and the axial pressure of the concrete entering the electromagnetic shaftless pump driving the multi-stage booster device is p s . If there are m stages of booster assemblies reaching the rated pressure p we , m < j0, then the rotational speed of the (m + 1)th stage of the booster assembly is:

[0026]

[0027] Let Equation 5 be equal to Equation 6, and the required output pressure p can be obtained for restoration ehAt that time, the rotational speed n of the (m+1)th stage supercharger assembly is:

[0028]

[0029] The radial pressure p of the concrete at the inlet of the booster assembly is monitored by a pressure sensor. d For ordinary concrete, the radial pressure p of the concrete in the conveying pipeline d With axial pressure p s If the ratio α = 0.90, then the axial pressure p of the concrete entering the multi-stage booster device of the electromagnetic shaftless pump is... s =p d / α;

[0030] The axial pressure p of the concrete at the inlet of each stage of the booster unit is monitored by a pressure sensor inside the multi-stage booster unit propelled by an electromagnetic shaftless pump. s1 p s2 p s3 …p sj0 and the axial pressure p of the concrete at the outlet of the last stage booster assembly se ;

[0031] The concrete flow velocity v at the inlet of each stage of the booster unit is monitored by a velocity sensor inside the electromagnetic shaftless pump-driven multi-stage booster device. m1 v m2 v m3 …v mj0 and the concrete flow velocity v at the outlet of the last stage pressurization component e ;

[0032] If the radius from the center of rotation to the blade tip is r0, and the radius from the center of rotation to the blade root is r1 = d / 2, then the rotational speed at the blade tip is v0 = πnr0 / 30, and the rotational speed at the blade root is v1 = πnr1 / 30. Substituting v0, v1, and v... m(m+1) Substituting into Equation 7, we can obtain the rotational speed n of the (m+1)th stage booster component to restore the required output pressure. m+1 for:

[0033]

[0034] The rotational speed n of the first m-stage supercharger assembly j They are respectively:

[0035]

[0036] In the formula: j≤m;

[0037] If the pumped concrete is high-strength concrete, the pressure loss along the flow rate Δp per meter during vertical upward pumping is... Vum for:

[0038] Δp Vcm =Δp Vum=0.015 + 0.057η (Equation 10);

[0039] In the formula: Δp Vum η is the pressure loss per meter of the high-strength concrete vertical conveying pipe; η is the plastic viscosity.

[0040] Combining equations 3, 4, 5, 6, and 10, for high-strength concrete, to restore the required output pressure, the rotational speed n of the (m+1)th stage pressurization component... m+1 for:

[0041]

[0042] The rotational speed n of the first m-stage supercharger assembly j They are respectively:

[0043]

[0044] The method for compensating for the rotational speed of the booster components in the electromagnetic shaftless pump-driven multi-stage booster device includes:

[0045] The pressure sensor at the inlet of the j-th stage booster assembly monitors the concrete pressure at the outlet of the j-1-th stage booster assembly, while the pressure sensor at the outlet of the last stage booster assembly monitors the axial concrete pressure p at the outlet of the last stage booster assembly. se ;

[0046] The velocity sensor at the inlet of the j-th stage booster assembly monitors the concrete flow velocity at the outlet of the (j-1)-th stage booster assembly, and the velocity sensor at the outlet of the last stage booster assembly monitors the concrete flow velocity v at the outlet of the last stage booster assembly. e ;

[0047] The axial pressure of the concrete monitored by the pressure sensor at the outlet of the (m+1)th stage booster assembly is used to adjust the rotational speed n of the (m+1)th stage booster assembly.

[0048] If p eh -p s(m+2) >0, the rotational speed n of the (m+1)th stage booster component e(m+1) Increase Δn, if p eh -p s(m+2) <0, the rotational speed n of the (m+1)th stage booster component e(m+1) Reducing Δn, for ordinary concrete, the final rotational speed n of the (m+1)th stage booster component during actual concrete pumping after compensation is... e(m+1) for:

[0049]

[0050] For high-strength concrete, the final rotational speed n of the (m+1)th stage booster component during actual concrete pumping after compensation is... e(m+1) for:

[0051]

[0052] The buffer assembly includes an annular buffer seat, an annular buffer cavity disposed within the annular buffer seat, a plurality of buffer springs arranged along the circumferential direction of the annular buffer cavity, and an annular steel support connected at one end to the pressurization assembly. The other end of the annular steel support extends into the annular buffer cavity and is connected to an annular steel pad. The annular steel pad contacts or connects to the buffer springs corresponding to those in the annular buffer cavity.

[0053] The annular buffer seat is composed of an inner cylindrical buffer steel plate, an outer cylindrical buffer steel plate, an annular buffer base plate, and an annular steel clamping plate. The annular steel clamping plate has an annular groove that communicates with the annular buffer cavity. The annular groove has a smaller ring width than the annular buffer cavity, and the annular steel pad has a larger ring width than the annular groove.

[0054] The power assembly includes a stator core, stator teeth, and coils. The stator core is arranged circumferentially along the cylindrical protective cover, the coils are installed inside the stator core, and the stator teeth are connected to the stator core.

[0055] The pressure sensor is arranged circumferentially along the inner side of the support end cover, and each speed sensor is located between two adjacent pressure sensors.

[0056] The booster assembly has three stages: a first-stage booster assembly, a second-stage booster assembly, and a third-stage booster assembly. The pressure sensors include pressure sensor one, pressure sensor two, pressure sensor three, and pressure sensor four. The speed sensors include speed sensor one, speed sensor two, speed sensor three, and speed sensor four. Pressure sensor one and speed sensor one are both located on the side of the support end cover at the lower end of the first-stage booster assembly. Pressure sensor two and speed sensor two are both located on the side of the support end cover between the first-stage booster assembly and the second-stage booster assembly. Pressure sensor three and speed sensor three are both located on the side of the support end cover between the second-stage booster assembly and the third-stage booster assembly. Pressure sensor four and speed sensor four are both located on the side of the support end cover at the upper end of the third-stage booster assembly.

[0057] The advantages of this invention are:

[0058] (1) Reduce the initial pumping pressure of high-rise buildings to ensure construction safety, while reducing the pressure requirements of pumping equipment and the strength requirements of delivery pipes to reduce equipment cost investment;

[0059] (2) The electromagnetic shaftless pump pusher multi-stage booster device can increase the pumping height of the pumped concrete.

[0060] (3) The electromagnetic shaftless pump pusher has a large internal space in the pipeline, which is beneficial for pumping concrete.

[0061] (4) Monitor the concrete pumping pressure at all times, and adjust the number of pressurizing components to be turned on in real time when pressurizing, and pressurize at full load step by step for high efficiency and energy saving.

[0062] (5) Monitor the outlet pressure of the electromagnetic shaftless pump-driven multi-stage booster device at all times, and adjust the blade speed in a cyclical manner to ensure that the pressure meets the requirements and is stable.

[0063] (6) Adding an electromagnetic shaftless pump to the hose can ensure that the pouring pressure meets the requirements and make the poured concrete more compact. Attached Figure Description

[0064] Figure 1 This is a schematic diagram of the present invention;

[0065] Figure 2 This is a schematic diagram of the electromagnetic shaftless pump-driven multi-stage booster device of the present invention;

[0066] Figure 3 This is a schematic cross-sectional view of the electromagnetic shaftless pump-driven multi-stage booster device of the present invention.

[0067] Figure 4 This is a circuit diagram of the control system of the present invention;

[0068] Figure 5 for Figure 3 Cross-sectional view of AA in the middle;

[0069] Figure 6 for Figure 3 Cross-sectional view of BB in the middle;

[0070] Figure 7 for Figure 3 Cross-sectional view of CC in the middle;

[0071] Figure 8 for Figure 3 Cross-sectional view of DD in the middle;

[0072] Figure 9 for Figure 3 Cross-sectional view of the EE;

[0073] Figure 10 for Figure 3 Cross-sectional view of FF in the middle;

[0074] like Figures 1-10 As shown in the figure, the labels represent:

[0075] a. Pumping system; b. Electromagnetic shaftless pump multi-stage booster device; b1. First stage booster assembly; b2. Second stage booster assembly; b3. Third stage booster assembly; c. High-rise building;

[0076] 1. Pressurization component, 2. Buffer component, 3. Connecting pipe, 4. Conveying pipe, 5. Concrete pumping direction, 6. Rotation direction, 7. Concrete feeder, 8. Grouting hose;

[0077] 11. Rotor assembly, 12. Power assembly, 13. Cylindrical protective cover, 14. Support end cover, 15. Control system, 111. Steel cylinder, 112. Annular slider, 113. Blade, 114. Permanent magnet, 121. Stator core, 122. Stator tooth pole, 123. Wire coil, 131. Outer plate of cylindrical protective cover, 132. Annular protective cover cover plate, 133. Annular groove, 151. Pressure sensor one, 152. Pressure sensor two, 153. Pressure sensor three, 154. Pressure sensor four, 155. Speed ​​sensor one, 156. Speed ​​sensor two, 157. Speed ​​sensor three, 158. Speed ​​sensor four, 159. Processor;

[0078] 21. Annular buffer seat, 22. Annular steel support, 23. Annular steel pad, 24. Annular buffer cavity, 25. Buffer spring, 26. Rubber washer, 211. Inner steel plate of cylindrical buffer, 212. Outer steel plate of cylindrical buffer, 213. Annular buffer base plate, 214. Annular steel clamping plate;

[0079] 31. Connecting cylinder; 32. Thread;

[0080] 71. Storage silo, 72. Concrete, 73. Base. Detailed Implementation

[0081] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art:

[0082] Example: Figure 1-10 As shown, this embodiment relates to a method for pumping concrete to high-rise buildings using an electromagnetic shaftless pump with push-belt compensation at stages under full load. The method utilizes pumping system a to pump concrete to the high-rise building c. The pumping method mainly includes:

[0083] The concrete feeder 7 is placed on the ground, and the conveying pipe 4 and the grouting hose 8 are connected to the concrete feeder 7 in sequence so that the grouting hose 8 extends to the corresponding position of the high-rise building c.

[0084] like Figure 1-2As shown, the inlet of the conveying pipe 4 is connected to the concrete feeder 7 on the ground, and the outlet of the conveying pipe 4 extends upward and is connected to the grouting hose 8. Multiple electromagnetic shaftless pump-driven multi-stage booster devices b are provided. The electromagnetic shaftless pump-driven multi-stage booster devices b are arranged on the conveying pipe 4. Part of the electromagnetic shaftless pump-driven multi-stage booster devices b are arranged on the vertical section of the conveying pipe 4, and the other part is arranged on the horizontal section of the conveying pipe 4. The grouting hose 8 is connected to the vertical section of the conveying pipe 4, and the concrete feeder 7 is connected to the horizontal section of the conveying pipe 4 through the electromagnetic shaftless pump-driven multi-stage booster devices b. Specifically, the concrete feeder 7 includes a storage bin 71 and a base 73. The storage bin 71 is installed on the base 74. The storage bin 71 stores concrete 72. The concrete feeder 77 pumps the concrete 72, and the concrete 72 is pumped to the corresponding position of the high-rise building c through the conveying pipe 4 and the grouting hose 8 in sequence.

[0085] like Figure 1-2 As shown, the electromagnetic shaftless pump multi-stage booster device b mainly includes a three-stage booster assembly 1, two buffer assemblies 2, and two connecting pipes 3. The booster assembly 1, buffer assemblies 2, and connecting pipes 3 are coaxially arranged. The three-stage booster assembly 1 consists of a first-stage booster assembly a1, a second-stage booster assembly a2, and a third-stage booster assembly a3. The three-stage booster assemblies 1 are connected sequentially. The first-stage booster assembly a1 and the third-stage booster assembly a3 are respectively connected to the two buffer assemblies 2. The two buffer assemblies 2 are respectively connected to the two connecting pipes 3. The connecting pipes 3 are threaded to the conveying pipes 4 (grouting hose 8 and concrete feeder 7). Specifically, the connecting pipes 3 are connecting cylinders 31 with threads 32. One end of the connecting cylinder 31 is fixedly connected to the buffer assembly 2, and the other end is connected to the conveying pipes 4 (grouting hose 8 and concrete feeder 7) through the threads 32 on it.

[0086] like Figure 1-7As shown, the booster assembly 1 includes a rotor assembly 11, a power assembly 12, a cylindrical protective cover 13, a support end cover 14, and a control system 15. The support end cover 14 is located at both ends of the cylindrical protective cover 13. Both the rotor assembly 11 and the power assembly 12 are installed inside the cylindrical protective cover 13, with the power assembly 12 located outside the rotor assembly 11. The power assembly 12 can drive the rotor assembly 11 to rotate. The cylindrical protective cover 13 consists of an outer cylindrical protective cover plate 131 and an annular protective cover cover plate 132. The annular protective cover cover plate 132 is provided with an annular groove 133. The rotor assembly 11 includes a steel cylinder 111, an annular slider 112, blades 113, and a permanent magnet 114. The annular slider 112 is located at both ends of the steel cylinder 111 and cooperates with the annular groove 133. The annular slider 112 can rotate within the annular groove 133. The blades 113 are arranged circumferentially along the inner wall of the steel cylinder 111, and there is a set of them. The blades 113 are fan-shaped and inclined. The blades 113 are located in the middle of the inner wall of the steel cylinder 111. The pumping direction 5 of the concrete is from bottom to top. The blades 113 can withstand the impact of the pumped concrete and guide the pumped concrete. The permanent magnet 114 is arranged circumferentially along the outer wall of the steel cylinder 111.

[0087] The power assembly 12 includes a stator core 121, stator teeth 122, and wire coils 123. The stator core 121 is arranged circumferentially along the cylindrical protective cover 13. The wire coils 123 are installed inside the stator core 121. The stator teeth 122 are arc-shaped and connected to the stator core 121. By energizing the wire coils 123, the power assembly 12 can generate a rotating magnetic field. The rotating magnetic field generated by the power assembly 12 drives the permanent magnet 114 of the rotor assembly 11 to rotate, thereby driving the steel cylinder 111 to rotate. That is, the annular slider 112 rotates within the annular groove 133, thus realizing the rotation of the blades 113 (see rotation direction 6 of the booster device). Figure 2 (As shown).

[0088] like Figure 2 , 4As shown in Figure 7, the control system 15 includes a pressure sensor, a speed sensor, and a processor 155. The pressure sensor and speed sensor are electrically connected to the processor 155. The pressure sensor and speed sensor measure the pressure and speed of the concrete, respectively, and transmit the data to the processor 155 for analysis and processing. The pressure sensor and speed sensor are both arranged circumferentially along the inner wall of the steel cylinder 111, and they are staggered, that is, each speed sensor is located between two adjacent pressure sensors, and each pressure sensor is located between two adjacent speed sensors. In this embodiment, the pressure sensors include pressure sensor 151, pressure sensor 152, pressure sensor 153, and pressure sensor 154, and the speed sensors include speed sensor 155, speed sensor 156, speed sensor 157, and speed sensor 158. Pressure sensor 151 and speed sensor 155 are both located on the side of the lower end support cap 14 of the first-stage pressurization assembly a1. Pressure sensor 152 and speed sensor 156 are both located on the side of the support cap 14 between the first-stage pressurization assembly a1 and the second-stage pressurization assembly a2. Pressure sensor 153 and speed sensor 157 are both located on the side of the support cap 14 between the second-stage pressurization assembly a2 and the third-stage pressurization assembly a3. Pressure sensor 154 and speed sensor 158 are both located on the side of the upper end support cap 14 of the third-stage pressurization assembly a3, which can improve the accuracy of the measurement results.

[0089] like Figure 2As shown in Figures 8-10, the buffer assembly 2 includes an annular buffer seat 21, an annular steel support 22, an annular steel pad 23, an annular buffer cavity 24, buffer springs 25, and rubber washers 26. The annular buffer cavity 24 is located inside the annular buffer seat 21. Multiple buffer springs 25 are arranged along the circumferential direction of the annular buffer cavity 24 to provide a buffering effect. In this embodiment, the annular buffer seat 21 is composed of a cylindrical inner buffer steel plate 211, a cylindrical outer buffer steel plate 212, an annular buffer base plate 213, and an annular steel clamping plate 214. The annular steel clamping plate 214 has an annular groove that communicates with the annular buffer cavity 24. The size of the annular groove is similar to that of the annular buffer cavity 24. The size of the annular steel support 22 is adapted to the size of the annular groove, which guides the annular steel support 22. One end of the annular steel support 22 is connected to the support end cap 14, and the other end extends through the annular groove into the annular buffer cavity 24 and is connected to the annular steel pad 23. The annular steel pad 23 contacts or connects with the buffer spring 25 in the corresponding annular buffer cavity 24. The size of the annular buffer cavity 24 is adapted to the size of the annular steel pad 23, and the annular buffer cavity 24 guides the annular steel pad 23. The annular steel pad 23 has a ring width greater than the annular groove width, which can prevent the annular steel support 22 from moving outside the annular buffer cavity 22 of the buffer assembly 2. A rubber gasket 26 is provided between the support end cap 14 and the annular buffer seat 21, and the rubber gasket 26 is sleeved on the outside of the annular steel support 22. This not only prevents the support end cap 14 and the annular buffer seat 21 from colliding, but also guides the annular steel support 22.

[0090] The electromagnetic shaftless pump pushes the power components, pressure sensors, and speed sensors of the multi-stage booster unit. The rotational speed of the booster components is adjusted step-by-step using monitoring data from the pressure and speed sensors. Concrete is then pumped to the corresponding location on the high-rise building via a concrete mixer. The booster value is determined by the monitoring data and distributed to the booster components using a step-by-step full-load boosting method. This determines the rotational speed of the booster components. Step-by-step full-load boosting means that the booster components gradually increase the pressure of the concrete. When one booster component reaches full load, the next booster component continues to increase the pressure until the desired booster value is reached. Once the desired booster value is reached, the subsequent booster components remain idle, saving energy. In this embodiment, the booster assembly on the electromagnetic shaftless pump-driven multi-stage booster device has three stages. When the required booster value can be achieved by activating the first-stage booster assembly, the first-stage booster assembly is activated, while the second-stage and third-stage booster assemblies are not activated. When the required booster value can be achieved by activating the two-stage booster assemblies, the first-stage and second-stage booster assemblies are activated, while the third-stage booster assembly is not activated. At this time, the first-stage booster assembly is in a fully loaded state, and the second-stage booster assembly is either fully loaded or not fully loaded. When the required booster value can be achieved by activating the three-stage booster assembly, the first-stage, second-stage, and third-stage booster assemblies are activated. At this time, the first-stage and second-stage booster assemblies are in a fully loaded state, and the third-stage booster assembly is either fully loaded or not fully loaded.

[0091] Specifically, it is necessary to calculate and compensate for the rotational speed of the booster components in the multi-stage booster device driven by the electromagnetic shaftless pump. The calculation method for the rotational speed of the booster components in the multi-stage booster device driven by the electromagnetic shaftless pump includes:

[0092] Let the length of the electromagnetic shaftless pump pushing the multi-stage booster device be ΔL, and it consists of j0 booster components, j=1, 2, 3, …j…j0, then the length of each booster component is δ=ΔL / j0;

[0093] Let the inner diameter of the booster assembly be d (in meters), and the self-weight of the pumped concrete be γ (in N / m³). 3 Where g is the acceleration due to gravity, g = 9.8 m / s² 2 ;

[0094] The electromagnetic shaftless pump pushes a multi-stage booster device to pump concrete vertically upwards. The pressure loss Δp experienced by the concrete during pumping is determined by Δp Vc and Δp γ It consists of two parts, where Δp VcIt is the friction loss experienced by concrete as it flows within the pump pipe, including the resistance generated by the viscosity of the concrete and the frictional resistance generated by the flow of the concrete; Δp γ It is the pressure generated by the weight of concrete during vertical pumping, that is, the total pressure loss Δp of concrete pumped vertically upward in each stage of the booster assembly. FI for:

[0095] Δp FI =Δp Vc +Δp γ Formula 1;

[0096] If the pumped concrete is ordinary concrete, the pressure loss along the flow rate Δp per meter during vertical upward pumping is... Vcm for:

[0097]

[0098] In the formula: Δp Vcm d is the pressure loss per meter of concrete flowing in the vertical delivery pipe, measured in Pa / m; d is the diameter of the concrete delivery pipe, measured in meters; K1 is the viscosity coefficient, measured in Pa; K2 is the velocity coefficient, measured in Pa·s / m; S1 is the concrete slump, measured in mm; t2 / t1 is the ratio of the switching time of the concrete pump distribution valve to the time of the piston pushing the concrete, which can be taken as 0.30 when the equipment performance is unknown; v m α is the average flow velocity of the concrete mixture in the conveying pipe, in m / s; α is the ratio of radial pressure to axial pressure, which is 0.90 for ordinary concrete; β is a conversion factor, which is 3, 4, and 5 when d / 2 is 100, 125, and 150 mm respectively.

[0099] The pressure Δp generated per meter of concrete by its weight during vertical pumping γm (Unit: Pa / m) is:

[0100] Δp γm =γ Equation 3;

[0101] Substituting Equations 2 and 3 into Equation 1, we can obtain the total pressure loss Δp of the concrete pumped vertically upward in each stage of the pressurization assembly. FI for:

[0102]

[0103] The pressure p generated by the j-th stage pressurization component on the pumped concrete w (Unit: Pa / m) is:

[0104] p w =γv 2 / 2g=γ[v1 / (πnR / 30v0)] 2 / 2g Formula 5;

[0105] Where: v is the flow velocity provided by the j - th stage pressurization component for the concrete, with the unit of m / s, and \(v = v_1 / (\omega R / v_0)=v_1 / (\pi nR / 30v_0)\); \(\omega\) is the angular velocity of each stage pressurization component, with the unit of rad / s; n is the rotational speed, with the unit of r / min; R is the blade radius, with the unit of m; \(v_0\) is the tip speed, with the unit of m / s; \(v_1\) is the root speed, with the unit of m / s;

[0106] Let the required output concrete pressure of the electromagnetic shaftless pump - driven multi - stage pressurization device be p eh , and the axial pressure of the concrete entering the electromagnetic shaftless pump - driven multi - stage pressurization device be \(p_{in}\) s . If m stages of pressurization components reach the rated pressure \(p_{rated}\) we , and \(m\lt j_0\), then the rotational speed of the \((m + 1)\) - th stage pressurization component is:

[0107]

[0108] Let Equation 5 be equal to Equation 6, and it can be obtained that when restoring the required output pressure p eh , the rotational speed n of the \((m + 1)\) - th stage pressurization component is:

[0109]

[0110] Monitor the radial pressure \(p_{r}\) of the concrete at the inlet of the pressurization component through a pressure sensor d . For ordinary concrete, the ratio \(\alpha\) of the radial pressure \(p_{r}\) of the concrete in the conveying pipeline to the axial pressure \(p_{a}\) d is 0.90, then the axial pressure \(p_{a}\) of the concrete entering the electromagnetic shaftless pump - driven multi - stage pressurization device is \(p_{in}\) s \(= p_{r} / \alpha\); s \(= p_{r}\) d / \(\alpha\);

[0111] Monitor the axial pressure \(p_{a1}\), \(p_{a2}\), \(p_{a3}\),…\(p_{am}\) of the concrete at the inlet of each stage pressurization component and the axial pressure \(p_{aout}\) of the concrete at the outlet of the last stage pressurization component through the pressure sensors in the electromagnetic shaftless pump - driven multi - stage pressurization device s1 , \(p_{a2}\) s2 , \(p_{a3}\) s3 …\(p_{am}\) sj0 and; se ;

[0112] Monitor the flow velocity \(v_1\), \(v_2\), \(v_3\),…\(v_m\) of the concrete at the inlet of each stage pressurization component and the flow velocity \(v_{out}\) of the concrete at the outlet of the last stage pressurization component through the velocity sensors in the electromagnetic shaftless pump - driven multi - stage pressurization device m1 , \(v_2\) m2 , \(v_3\) m3 …\(v_m\) mj0 and; e ;

[0113] If the radius from the center of rotation to the blade tip is r0, and the radius from the center of rotation to the blade root is r1 = d / 2, then the rotational speed at the blade tip is v0 = πnr0 / 30, and the rotational speed at the blade root is v1 = πnr1 / 30. Substituting v0, v1, and v... m(m+1) Substituting into Equation 7, we can obtain the rotational speed n of the (m+1)th stage booster component to restore the required output pressure. m+1 for:

[0114]

[0115] The rotational speed n of the first m-stage supercharger assembly j (j≤m) are respectively:

[0116]

[0117] If the pumped concrete is high-strength concrete, the pressure loss along the flow rate Δp per meter during vertical upward pumping is... Vum for:

[0118] Δp Vcm =Δp Vum =0.015 + 0.057η (Equation 10);

[0119] In the formula: Δp Vum η is the pressure loss per meter of the high-strength concrete vertical conveying pipe; η is the plastic viscosity.

[0120] Combining equations 3, 4, 5, 6, and 10, for high-strength concrete, to restore the required output pressure, the rotational speed n of the (m+1)th stage pressurization component... m+1 for:

[0121]

[0122] The rotational speed n of the first m-stage supercharger assembly j (j≤m) are respectively:

[0123]

[0124] Methods for compensating for the rotational speed of the booster components in a multi-stage booster device driven by an electromagnetic shaftless pump include:

[0125] The pressure sensor at the inlet of the j-th stage booster assembly monitors the concrete pressure at the outlet of the j-1-th stage booster assembly, while the pressure sensor at the outlet of the last stage booster assembly monitors the axial concrete pressure p at the outlet of the last stage booster assembly. se ;

[0126] The velocity sensor at the inlet of the j-th stage booster assembly monitors the concrete flow velocity at the outlet of the (j-1)-th stage booster assembly, and the velocity sensor at the outlet of the last stage booster assembly monitors the concrete flow velocity v at the outlet of the last stage booster assembly. e ;

[0127] The axial pressure of the concrete monitored by the pressure sensor at the outlet of the (m+1)th stage booster assembly is used to adjust the rotational speed n of the (m+1)th stage booster assembly.

[0128] If p eh -p s(m+2) >0, the rotational speed n of the (m+1)th stage booster component e(m+1) Increase Δn, if p eh -p s(m+2) <0, the rotational speed n of the (m+1)th stage booster component e(m+1) Reducing Δn, for ordinary concrete, the final rotational speed n of the (m+1)th stage booster component during actual concrete pumping after compensation is... e(m+1) for:

[0129]

[0130] For high-strength concrete, the final rotational speed n of the (m+1)th stage booster component during actual concrete pumping after compensation is... e(m+1) for:

[0131]

[0132] The beneficial technical effects of this embodiment are as follows:

[0133] (1) Reduce the initial pumping pressure of high-rise buildings to ensure construction safety, while reducing the pressure requirements of pumping equipment and the strength requirements of delivery pipes to reduce equipment cost investment;

[0134] (2) The electromagnetic shaftless pump pusher multi-stage booster device can increase the pumping height of the pumped concrete.

[0135] (3) The electromagnetic shaftless pump pusher has a large internal space in the pipeline, which is beneficial for pumping concrete.

[0136] (4) Monitor the concrete pumping pressure at all times, and adjust the number of pressurizing components to be turned on in real time when pressurizing, and pressurize at full load step by step for high efficiency and energy saving.

[0137] (5) Monitor the outlet pressure of the electromagnetic shaftless pump-driven multi-stage booster device at all times, and adjust the blade speed in a cyclical manner to ensure that the pressure meets the requirements and is stable.

[0138] (6) Adding an electromagnetic shaftless pump to the hose can ensure that the pouring pressure meets the requirements and make the poured concrete more compact.

[0139] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A method for staged full-load pumping of ultra-high-rise concrete using an electromagnetic shaftless pump with push-belt compensation, characterized in that... The pumping method includes: A concrete feeder is placed on the ground, and a delivery pipe and a grouting hose are connected to the concrete feeder in sequence so that the grouting hose extends to the corresponding location of the high-rise building. The conveying pipe is equipped with an electromagnetic shaftless pump-driven multi-stage booster device, which includes a multi-stage booster assembly. The booster assembly includes a rotor assembly, a power assembly, a cylindrical protective cover, and a support end cover. The rotor assembly and the power assembly are both installed inside the cylindrical protective cover. The support end cover is located at both ends of the cylindrical protective cover. The rotor assembly includes a steel cylinder, an annular slider, blades, and a permanent magnet. The annular slider is located at both ends of the steel cylinder. The blades are arranged circumferentially along the inner wall of the steel cylinder. The permanent magnet is arranged circumferentially along the outer wall of the steel cylinder. The cylindrical protective cover is provided with an annular groove that cooperates with the annular slider. The rotating magnetic field generated by the power assembly drives the permanent magnet of the rotor assembly to rotate. A pressure sensor and a speed sensor are provided on the inner side of the support end cover. The power component, pressure sensor, and speed sensor of the booster assembly on the electromagnetic shaftless pump multi-stage booster device are activated. The rotational speed of the booster assembly on the electromagnetic shaftless pump multi-stage booster device is adjusted step-by-step using the monitoring data from the pressure sensor and speed sensor. Concrete is then pumped to the corresponding location on the high-rise building via the concrete mixer. The booster value is determined based on the monitoring data, and the booster value is distributed to the electromagnetic shaftless pump multi-stage booster device using a step-by-step full-load boosting method. The aforementioned pressurizing components are used to determine the rotational speed of the pressurizing components on the multi-stage pressurizing device propelled by the electromagnetic shaftless pump. Here, "step-by-step full-load pressurization" means that the concrete is pressurized step-by-step by the pressurizing components on the multi-stage pressurizing device propelled by the electromagnetic shaftless pump. When the pressurization of the concrete by a certain stage of the pressurizing component reaches full load, the next stage of the pressurizing component continues to pressurize the concrete until the required pressurization value is reached. It is necessary to calculate and compensate for the rotational speed of the pressurizing components on the multi-stage pressurizing device propelled by the electromagnetic shaftless pump. The method for calculating the rotational speed of the booster component in the electromagnetic shaftless pump-driven multi-stage booster device includes: Let the length of the electromagnetic shaftless pump pushing the multi-stage booster device be Δ. L There are a total of j Composed of a 0-stage booster assembly, j =1, 2, 3, ... j … j If 0, then the length of each booster assembly is δ = Δ L / j 0; Assume the inner diameter of the concrete delivery pipe is d The self-weight of the pumped concrete is γ , g It is the acceleration due to gravity; The electromagnetic shaftless pump uses a multi-stage booster unit to pump concrete vertically upwards. The total pressure loss during the vertical upward pumping of concrete in each booster unit is [not specified]. Δp FI Losses along the route Δp Vc and gravity loss Δp γ It consists of two parts, namely: D p FI = D p Vc +D p γ formula 1; If the pumped concrete is ordinary concrete, the pressure loss along the line per meter of vertical upward pumping is Δ. p Vcm for: Formula 2; In the formula: Δ p Vcm It is the pressure loss per meter generated when ordinary concrete flows in a vertical conveying pipe; d It is the inner diameter of the concrete delivery pipe; K 1 is the coefficient of adhesion; K 2 is the velocity coefficient; S 1 represents the concrete slump; t 2 / t 1 is the ratio of the switching time of the concrete pump distribution valve to the time of the piston pushing concrete. When the equipment performance is unknown, it can be taken as 0.

30. v m It is the average flow velocity of the concrete mixture within the delivery pipe; α It is the ratio of radial pressure to axial pressure, which is taken as 0.90 for ordinary concrete; β These are conversion factors. d When / 2 is 100, 125, and 150 mm respectively, β Choose 3, 4, or 5; The pressure Δ per meter of concrete weight generated during vertical concrete pumping p γm for: Δ p γm = γ Formula 3; Substituting Equations 2 and 3 into Equation 1, we can obtain the total pressure loss Δ of the concrete pumped vertically upward in each stage of the pressurization assembly. p FI for: Equation 4; In the formula: δ is the length of each stage of the booster assembly; No. j The pressure generated by the booster unit on the pumped concrete p w for: Formula 5; In the formula: v It is the first j The flow rate provided by the booster unit to the concrete. ; ω It is the angular velocity of each stage of the booster assembly; n It is the rotational speed; R It is the blade radius; v 0 is the tip velocity of the blade; v 1 represents the velocity at the leaf root; Assuming the electromagnetic shaftless pump pushes a multi-stage booster device, the required output concrete pressure is... p eh The axial pressure of the concrete entering the multi-stage booster device of the electromagnetic shaftless pump is... p s If there is m The booster unit reaches the rated pressure p we , m < j If 0, then the rotational speed of the (m+1)th stage supercharger assembly is: Formula 6; Equation 5 equals Equation 6, so we can obtain the required output pressure for restoration. p eh At that time, the first m +1 stage turbocharger speed n m+1 for: Formula 7; The radial pressure of the concrete at the inlet of the booster assembly is monitored using a pressure sensor. p d For ordinary concrete, the radial pressure of concrete in the conveying pipeline p d With axial pressure p s ratio α = 0.90, then the axial pressure of the concrete entering the multi-stage booster device of the electromagnetic shaftless pump is 0.

90. p s = p d / α ; The axial pressure of the concrete at the inlet of each stage of the booster unit is monitored by a pressure sensor inside the multi-stage booster device propelled by an electromagnetic shaftless pump. p s1 , p s2 , p s3 … p sj0 and the concrete axial pressure at the outlet of the final stage booster assembly p se ; The concrete flow velocity at the inlet of each stage of the booster unit is monitored by a velocity sensor inside the electromagnetic shaftless pump-driven multi-stage booster device. v m1 , v m2 , v m3 … v mj0 and the concrete flow rate at the outlet of the final stage pressurization component v e ; If the radius from the center of rotation to the blade tip is r 0, the radius from the center of rotation to the leaf root is r 1 = d / 2, then the blade tip rotation speed is v 0=π nr 0 / 30, blade root rotation speed v 1 = π nr 1 / 30, will v 0、 v 1 and v m(m+1) Substituting into equation 7, we can obtain the required output pressure for recovery. m +1 stage turbocharger speed n m+1 for: Formula 8; forward m Speed ​​of the supercharger assembly n j They are respectively: Equation 9; In the formula: j ≤ m ; If the pumped concrete is high-strength concrete, the pressure loss along the flow rate Δ per meter during vertical upward pumping is... p Vum for: D p Vcm =D p Vum =0.015+0.057 η formula 10; In the formula: Δ p Vum This refers to the pressure loss per meter of a high-strength concrete vertical conveying pipe. η It is a plastic viscosity; Combining equations 3, 4, 5, 6, and 10, for high-strength concrete, in order to restore the required output pressure, the first... m +1 stage turbocharger speed n m+1 for: Formula 11; forward m Speed ​​of the supercharger assembly n j They are respectively: Equation 12.

2. The method for step-by-step full-load pumping of ultra-high-rise concrete using an electromagnetic shaftless pump with push-belt compensation as described in claim 1, characterized in that... The method for compensating for the rotational speed of the booster components in the electromagnetic shaftless pump-driven multi-stage booster device includes: No. j The pressure sensor at the inlet of the booster unit also monitors the first... j The concrete pressure at the outlet of the -1 stage booster assembly is monitored by a pressure sensor at the outlet of the final stage booster assembly, which also detects the axial pressure of the concrete at that outlet. p se ; No. j The speed sensor at the inlet of the booster assembly also monitors the first... j The concrete flow velocity at the outlet of the -1 stage booster assembly is monitored by a velocity sensor at the outlet of the final stage booster assembly. v e ; No. m The axial pressure of the concrete monitored by the pressure sensor at the outlet of the +1 stage booster assembly is used to adjust the... m +1 stage turbocharger speed n ; like p eh - p s(m+2) >0, No. m +1 stage turbocharger speed n e(m+1) Increase Δ n ,like p eh - p s(m+2) <0, no. m +1 stage turbocharger speed n e(m+1) Reduce Δ n For ordinary concrete, after speed compensation, the final pumping speed of the concrete will be... m +1 stage turbocharger speed n e(m+1) for: Equation 13; For high-strength concrete, after speed compensation, the final pumping speed of the concrete is... m +1 stage turbocharger speed n e(m+1) for: Equation 14.

3. The method for step-by-step full-load pumping of ultra-high-rise concrete using an electromagnetic shaftless pump with push-belt compensation as described in claim 1, characterized in that... The electromagnetic shaftless pump-driven multi-stage booster device also includes two buffer components. Each buffer component includes an annular buffer seat, an annular buffer cavity disposed within the annular buffer seat, a plurality of buffer springs disposed along the circumferential direction of the annular buffer cavity, and an annular steel support connected at one end to the booster component. The other end of the annular steel support extends into the annular buffer cavity and is connected to an annular steel pad. The annular steel pad contacts or connects to the buffer springs corresponding to those in the annular buffer cavity.

4. The method for step-by-step full-load pumping of ultra-high-rise concrete using an electromagnetic shaftless pump with push-belt compensation as described in claim 3, characterized in that... The annular buffer seat is composed of an inner cylindrical buffer steel plate, an outer cylindrical buffer steel plate, an annular buffer base plate, and an annular steel clamping plate. The annular steel clamping plate has an annular groove that communicates with the annular buffer cavity. The annular groove has a smaller ring width than the annular buffer cavity, and the annular steel pad has a larger ring width than the annular groove.

5. A method for progressive full-load pumping of ultra-high-rise concrete using an electromagnetic shaftless pump with push-belt compensation as described in claim 1, characterized in that... The power assembly includes a stator core, stator teeth, and coils. The stator core is arranged circumferentially along the cylindrical protective cover, the coils are installed inside the stator core, and the stator teeth are connected to the stator core.

6. The method for step-by-step full-load pumping of ultra-high-rise concrete using an electromagnetic shaftless pump with push-belt compensation as described in claim 1, characterized in that... The pressure sensor is arranged circumferentially along the inner side of the support end cover, and each speed sensor is located between two adjacent pressure sensors.

7. A method for progressive full-load pumping of ultra-high-rise concrete using an electromagnetic shaftless pump with push-belt compensation as described in claim 6, characterized in that... The booster assembly has three stages: a first-stage booster assembly, a second-stage booster assembly, and a third-stage booster assembly. The pressure sensors include pressure sensor one, pressure sensor two, pressure sensor three, and pressure sensor four. The speed sensors include speed sensor one, speed sensor two, speed sensor three, and speed sensor four. Pressure sensor one and speed sensor one are both located on the side of the support end cover at the lower end of the first-stage booster assembly. Pressure sensor two and speed sensor two are both located on the side of the support end cover between the first-stage booster assembly and the second-stage booster assembly. Pressure sensor three and speed sensor three are both located on the side of the support end cover between the second-stage booster assembly and the third-stage booster assembly. Pressure sensor four and speed sensor four are both located on the side of the support end cover at the upper end of the third-stage booster assembly.

Images