A method for electromagnetic shaftless pump pushing and step-by-step full load pumping of super high-rise concrete

Abstract

The application discloses a kind of super high-rise concrete electromagnetic type shaftless pump push multi-stage full load pumping method, comprising: the concrete material machine is arranged on ground, and conveying pipe and grouting hose are sequentially connected on the concrete material machine, so that grouting hose extends to the corresponding position of high-rise building;Each power component, pressure sensor and speed sensor of multi-stage pressurizing assembly on electromagnetic type shaftless pump push multi-stage pressurizing device are opened, the rotational speed of pressurizing assembly on electromagnetic type shaftless pump push multi-stage pressurizing device is adjusted by monitoring data of pressure sensor and speed sensor, and concrete is pumped to the corresponding position of high-rise building by concrete material machine;The pressurization value is determined by monitoring data, and the pressurization value is distributed to pressurizing assembly on electromagnetic type shaftless pump push multi-stage pressurizing device by multi-stage full load pressurization method.The application has the advantages that: concrete pumping pressure is monitored at any time, the number of pressurizing assembly is adjusted in real time when pressurizing, multi-stage full load pressurization, efficient and energy-saving.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of super high-rise pumping concrete pipeline transportation, and in particular to a super high-rise concrete electromagnetic shaftless pump pushing step-by-step full-load pumping method. BACKGROUND

[0002] With the development of urban construction, super high-rise buildings are increasing, and the test of vertical transportation of building materials for super high-rise buildings is becoming more and more severe. In addition to the problem of concrete mix ratio, the technical difficulty of super high-rise pumping mainly comes from the conveying capacity of concrete pumping equipment and pumping pipeline. When the building height reaches 300m or even 500m or more, the pumping of concrete becomes more and more difficult, and the improvement of the strength of concrete materials also intensifies the test of the pumping system. If the pumping system is not reasonably set during construction, the pump pipe is prone to blockage; or when the pumping pressure does not meet the height requirement, it will cause the project construction to stop and bring high cost, so the performance of the selected pumping equipment, the arrangement of the pumping system and the related operation process are particularly important for the realization of super high-pressure pumping.

[0003] At present, there are few related methods for super high-pressure pumping in China, the pumping system is lacking, the conventional pumping process is imperfect, and the concrete pumping is uncontrollable. When pumping high-rise buildings, events such as insufficient pumping pressure and pipe blockage during pumping are prone to occur. In conventional super high-rise construction projects, super high-pressure pumps and relay pumping methods are usually used. For example, patent number CN 115680285A “Super high-rise concrete pumping system and construction method” provides a huge pressure for pumping concrete through a super high-pressure pump group. In the aspect of relay pumping method and device, patent number CN 111622779 A “Pulse type pressure compensation long distance concrete conveying device and use method” provides a huge pressure for pumping concrete through a super high-pressure pump group. The outlet pipe of the pneumatic booster pump is connected to the conveying pipeline to compensate for the loss of pushing pressure of the concrete during conveying, so that the pressure of the concrete in the entire conveying pipeline remains stable, and long distance conveying of concrete is realized. Patent number CN 103541550 A “Construction pumping system for super high-rise building steel pipe concrete” connects a high-pressure pump and a pouring hose to a low-pressure pump through a discharge port, and achieves the purpose of super high-rise pumping through the relay mode of the two concrete pumps. Although the existing technology solves some problems of high-rise pumping concrete pressure and relay pumping, there are still the following problems: (1) long distance, super high-rise pumping, high pressure pump pressure, high performance and high cost of high pressure pump, high performance requirement of adjacent pressure pump pipeline, increase of equipment cost, low construction safety; (2) the traditional pressure pump provides intermittent pumping pressure, which is easy to cause blockage of the conveying pipeline; (3) the traditional pressure pump has large vibration and noise, which is not conducive to environmental protection; (4) the traditional pressure pump cannot realize multi-stage pressure boosting; (5) the pumping method for super high-rise pouring is difficult to ensure stable pouring pressure, which affects the quality of pouring. SUMMARY

[0004] The present application aims at providing a super high-rise concrete electromagnetic shaftless pump pushing multi-stage full-load pumping method according to the deficiencies of the prior art, which is characterized in that the pumping method comprises:

[0005] The present application aims at providing a super high-rise concrete electromagnetic shaftless pump pushing multi-stage full-load pumping method according to the deficiencies of the prior art, which is characterized in that the pumping method comprises:

[0006] The present application aims at providing a super high-rise concrete electromagnetic shaftless pump pushing multi-stage full-load pumping method according to the deficiencies of the prior art, which is characterized in that the pumping method comprises:

[0007] The concrete feeder is arranged on the ground, and the conveying pipe and the grouting hose are sequentially connected on the concrete feeder so that the grouting hose extends to the corresponding position of the high-rise building.

[0008] The conveying pipe is arranged with an electromagnetic shaftless pump pushing multi-stage pressure boosting device, which comprises a multi-stage pressure boosting assembly, two buffer assemblies and two connecting pipes. The pressure boosting assemblies are sequentially arranged, the first-stage pressure boosting assembly and the last-stage pressure boosting assembly are respectively connected with the two buffer assemblies, and the two buffer assemblies are respectively connected with the two connecting pipes. The pressure boosting assembly comprises a rotor assembly and a power assembly. The power assembly comprises a stator core, a stator tooth pole and a coil. The stator core is circumferentially arranged along the cylinder-shaped protective cover. The coil is installed in the stator core. The stator tooth pole is connected with the stator core. The rotating magnetic field generated by the power assembly drives the rotor assembly to rotate. The pressure boosting assembly is provided with blades, a pressure sensor and a speed sensor.

[0009] The power assembly, the pressure sensor and the speed sensor of the electromagnetic shaftless pump multi-stage pressurizing device are started, the rotational speed of the pressurizing assembly of the electromagnetic shaftless pump multi-stage pressurizing device is adjusted step by step by using the monitoring data of the pressure sensor and the speed sensor, and the concrete is pumped to the corresponding position of the high-rise building by the concrete pump; the pressurizing value is determined by monitoring data, and the pressurizing value is distributed to the pressurizing assembly of the electromagnetic shaftless pump multi-stage pressurizing device in a step-by-step full-load pressurizing manner to determine the rotational speed of the pressurizing assembly of the electromagnetic shaftless pump multi-stage pressurizing device, wherein the step-by-step full-load pressurizing refers to step-by-step pressurizing of the concrete by the pressurizing assembly of the electromagnetic shaftless pump multi-stage pressurizing device, when the pressurizing of the concrete by the pressurizing assembly of a certain stage reaches full load, the pressurizing of the concrete by the pressurizing assembly of the next stage continues until the required pressurizing value is reached; wherein the rotational speed of the pressurizing assembly of the electromagnetic shaftless pump multi-stage pressurizing device needs to be calculated.

[0010] The calculation method of the rotational speed of the pressurizing assembly of the electromagnetic shaftless pump multi-stage pressurizing device comprises:

[0011] Suppose the length of the electromagnetic shaftless pump multi-stage pressurizing device is ΔL, and there are j0 pressurizing assemblies, j = 1, 2, 3, … j … j0, then the length of each pressurizing assembly is δ = ΔL / j0;

[0012] Suppose the inner diameter of the pressurizing assembly is d, the self weight of the pumped concrete is γ, and g is the acceleration of gravity;

[0013] The electromagnetic shaftless pump multi-stage pressurizing device vertically pumps concrete, and the pressure loss Δp of the concrete during pumping is composed of Δp Vc and Δp γ , wherein Δp Vc is the frictional resistance of the concrete flowing in 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 is the pressure generated by the gravity of the concrete during vertical pumping, i.e. the total pressure loss Δp FI of the concrete vertically pumped in each pressurizing assembly is:

[0014] Δp FI = Δp Vc + Δp γ , formula 1;

[0015] If the pumped concrete is ordinary concrete, the frictional pressure loss Δp Vcm of each meter of vertical pumping is:

[0016]

[0017] wherein Δp Vcm is the pressure loss per meter of concrete flowing in the vertical delivery pipe; d is the diameter of the concrete delivery pipe; K1 is the viscosity 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, which can be taken as 0.30 when the performance of the equipment is unknown; v m is the average flow velocity of the concrete mixture in the delivery pipe; α is the ratio of the radial pressure to the axial pressure, which is taken as 0.90 for ordinary concrete; β is the conversion coefficient, which is taken as 3, 4, and 5 when d / 2 is 100, 125, and 150 mm, respectively;

[0018] The pressure Δp γm per meter of concrete gravity when the concrete is pumped vertically

[0019] Δp γm = γ formula 3

[0020] Substituting formula 2 and formula 3 into formula 1, the total pressure loss Δp FI of the concrete pumped vertically upward in each stage of the pressure boosting assembly is:

[0021]

[0022] The pressure p w of the jth stage of the pressure boosting assembly to the pumped concrete is:

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

[0024] wherein v is the flow velocity of the jth stage of the pressure boosting assembly to the concrete, v = v1 / (ωR / v0) = v1 / (πnR / 30v0); ω is the angular velocity of each stage of the pressure boosting assembly; n is the rotation speed; R is the blade radius; v0 is the tip speed; and v1 is the root speed;

[0025] Suppose that the electromagnetic shaftless pump pushing multi-stage pressure boosting device requires an output concrete pressure p eh , the axial pressure of the concrete entering the electromagnetic shaftless pump pushing multi-stage pressure boosting device is p s , if m stages of the pressure boosting assembly reach the rated pressure p we , m < j0, then:

[0026]

[0027] Let formula 5 equal formula 6, the rotation speed n of the m+1th stage of the pressure boosting assembly to restore the required output pressure p eh 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] wherein: Δp Vum is the pressure loss per meter of the vertical conveying pipe of high-strength concrete; and η is the plastic viscosity;

[0040] Combining formula 3, formula 4, formula 5, formula 6 and formula 10, for high-strength concrete, the rotational speed n of the m+1th stage of the pressure boosting assembly for restoring the required output pressure is m+1

[0041]

[0042] The rotational speed n of the first m stages of the pressure boosting assembly is j

[0043]

[0044] The pressure boosting assembly further comprises a cylindrical protective cover and a support end cover, the rotor assembly and the power assembly are both installed in the cylindrical protective cover, and the support end cover is arranged at both ends of the cylindrical protective cover.

[0045] The rotor assembly comprises a steel cylinder, annular sliding blocks arranged at both ends of the steel cylinder, blades arranged circumferentially along the inner wall of the steel cylinder, and permanent magnets arranged circumferentially along the outer wall of the steel cylinder, and the cylindrical protective cover is provided with annular sliding grooves matched with the annular sliding blocks.

[0046] The pressure sensors are arranged circumferentially along the inner side of the support end cover, each speed sensor is located between two adjacent pressure sensors, and the pressure sensors and the speed sensors are respectively electrically connected to a processor.

[0047] The buffer assembly comprises an annular buffer seat, an annular buffer cavity arranged in the annular buffer seat, a plurality of buffer springs arranged in the circumferential direction of the annular buffer cavity, and an annular steel support connected to one end of the pressure boosting assembly, wherein the other end of the annular steel support extends into the annular buffer cavity and is connected with an annular steel pad, and the annular steel pad is in contact with or connected to the buffer spring in the annular buffer cavity.

[0048] A rubber gasket is arranged between the support end cover and the annular buffer seat, and the rubber gasket is sleeved outside the annular steel support.

[0049] The advantages of the present application are:

[0050] (1) reducing the initial pumping pressure of high-rise buildings to ensure construction safety, while reducing the pressure requirement of pumping equipment and the strength requirement of conveying pipes, and reducing equipment cost investment;

[0051] (2) the electromagnetic shaftless pump pushing multi-stage pressure boosting device can increase the pumping height of the pumped concrete; ​​

[0052] (3) The electromagnetic shaftless pump pushing multi-stage pressurizing device has a large pipeline internal space, which is beneficial to the pumping of concrete;

[0053] (4) The concrete pumping pressure is monitored at all times, the number of pressurizing assemblies is adjusted in real time during pressurization, full load pressurization is gradually achieved, and high efficiency and energy saving are achieved;

[0054] (5) The electromagnetic shaftless pump pushing multi-stage pressurizing device arranged at the hose can ensure that the pouring pressure meets the requirements, so that the poured concrete is more compact. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1 is a schematic view of the present application;

[0056] Figure 2 is a schematic view of the electromagnetic shaftless pump pushing multi-stage pressurizing device of the present application;

[0057] Figure 3 is a cross-sectional position schematic view of the electromagnetic shaftless pump pushing multi-stage pressurizing device of the present application;

[0058] Figure 4 is a circuit diagram of the control system of the present application;

[0059] Figure 5 is a cross-sectional view of A-A in the present application; Figure 3

[0060] is a cross-sectional view of B-B in the present application; Figure 6 Figure 3 is a cross-sectional view of C-C in the present application;

[0061] Figure 7 Figure 3 is a cross-sectional view of D-D in the present application;

[0062] Figure 8 is a cross-sectional view of E-E in the present application; Figure 3

[0063] is a cross-sectional view of F-F in the present application; Figure 9 Figure 3

[0064] Figure 10 Figure 3

[0065] As shown in the figure, the marks in the figure respectively represent: Figures 1-10

[0066] a. Pumping system, b. Electromagnetic shaftless pump pushing multi-stage pressurizing device, b1. First stage pressurizing assembly, b2. Second stage pressurizing assembly, b3. Third stage pressurizing assembly, c. High-rise building;

[0067] ​​​​​​​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;

[0068] 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;

[0069] 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;

[0070] 31. Connecting cylinder; 32. Thread;

[0071] 71. Storage silo, 72. Concrete, 73. Base. Detailed Implementation

[0072] 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:

[0073] Example: Figures 1-10 As shown, this embodiment relates to a method for pumping concrete to high-rise buildings using an electromagnetic shaftless pump in stages at full load. The method utilizes pumping system a to pump concrete to the high-rise building c. The pumping method mainly includes:

[0074] 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.

[0075] like Figures 1-2As shown, the pulp inlet of the conveying pipe 4 is connected with the concrete material machine 7 on the ground, the pulp outlet of the conveying pipe 4 extends upward and is connected with the grouting hose 8, the electromagnetic shaftless pump multi-stage pressurizing device b is provided with a plurality of electromagnetic shaftless pump multi-stage pressurizing devices b, the electromagnetic shaftless pump multi-stage pressurizing device b is arranged on the conveying pipe 4, a part of the electromagnetic shaftless pump multi-stage pressurizing device b is arranged on the vertical section of the conveying pipe 4, another part is arranged on the horizontal section of the conveying pipe 4, and the grouting hose 8 is connected with the vertical section of the conveying pipe 4, the concrete material machine 7 is connected with the horizontal section of the conveying pipe 4 through the electromagnetic shaftless pump multi-stage pressurizing device b. Specifically, the concrete material machine 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 72 is pumped by the concrete material machine 7, 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.

[0076] As shown in the Figures 1-2 electromagnetic shaftless pump multi-stage pressurizing device b mainly includes a three-stage pressurizing assembly 1, two buffer assemblies 2 and two connecting pipes 3, the pressurizing assembly 1, the buffer assembly 2 and the connecting pipe 3 are coaxially arranged, the three-stage pressurizing assembly 1 is respectively a first-stage pressurizing assembly a1, a second-stage pressurizing assembly a2 and a third-stage pressurizing assembly a3, the three-stage pressurizing assembly 1 is sequentially connected, and the first-stage pressurizing assembly a1 and the third-stage pressurizing assembly a3 are respectively connected with the two buffer assemblies 2, the two buffer assemblies 2 are respectively connected with the two connecting pipes 3, and the connecting pipe 3 is threadedly connected with the conveying pipe 4 (the grouting hose 8 and the concrete material machine 7). Specifically, the connecting pipe 3 is a connecting cylinder 31 with threads 32, one end of the connecting cylinder 31 is fixedly connected with the buffer assembly 2, and the other end is connected with the conveying pipe 4 (the grouting hose 8 and the concrete material machine 7) through the threads 32 thereon.

[0077] As shown in the Figures 1-7As shown, the supercharging assembly 1 comprises a rotor assembly 11, a power assembly 12, a cylindrical protective cover 13, support end covers 14 arranged at both ends of the cylindrical protective cover 13, the rotor assembly 11 and the power assembly 12 are both installed in the cylindrical protective cover 13, and the power assembly 12 is located outside the rotor assembly 11 and can drive the rotor assembly 11 to rotate. The cylindrical protective cover 13 is composed of a cylindrical protective cover outer plate 131 and an annular protective cover cover plate 132, and the annular protective cover cover plate 132 is provided with an annular sliding groove 133. The rotor assembly 11 comprises a steel cylinder 111, annular sliding blocks 112 arranged at both ends of the steel cylinder 111, blades 113 and permanent magnets 114. The annular sliding blocks 112 are matched with the annular sliding groove 133 and can rotate in the annular sliding groove 133. The blades 113 are arranged circumferentially along the inner wall of the steel cylinder 111, and there is one set of blades 113. The blades 113 are fan-shaped and are arranged obliquely, and the blades 113 are located at the middle part of the inner wall of the steel cylinder 111. The pumping concrete conveying direction 5 is from bottom to top. The blades 113 can withstand the impact of the pumped concrete and guide the pumped concrete. The permanent magnets 114 are arranged circumferentially along the outer wall of the steel cylinder 111.

[0078] The power assembly 12 comprises a stator core 121, stator teeth 122 and a coil 123. The stator core 121 is arranged circumferentially along the cylindrical protective cover 13. The coil 123 is installed in the stator core 121. The stator teeth 122 are arc-shaped and connected with the stator core 121. By energizing the coil 123, the power assembly 12 can generate a rotating magnetic field, and the rotating magnetic field generated by the power assembly 12 drives the permanent magnets 114 of the rotor assembly 11 to rotate, so as to drive the steel cylinder 111 to rotate, i.e. the annular sliding blocks 112 rotate in the annular sliding groove 133, thereby realizing the rotation of the blades 113 (the rotation direction 6 of the supercharging device is shown in Figure 2

[0079] As Figure 2 , 4 ​As shown in FIGS. 7 and 8, the control system 15 comprises pressure sensors and speed sensors, which are electrically connected to the processor 155, respectively. The pressure and speed of the concrete are measured by the pressure sensors and speed sensors, respectively, and the data are transmitted to the processor 155 for analysis and processing. The pressure sensors and speed sensors are both arranged circumferentially along the inner wall of the steel cylinder 111, and are staggered between each other, i.e., each speed sensor is arranged between two adjacent pressure sensors, and each pressure sensor is arranged between two adjacent speed sensors. In this embodiment, the pressure sensors comprise a first pressure sensor 151, a second pressure sensor 152, a third pressure sensor 153 and a fourth pressure sensor 154, and the speed sensors comprise a first speed sensor 155, a second speed sensor 156, a third speed sensor 157 and a fourth speed sensor 158. The first pressure sensor 151 and the first speed sensor 155 are both arranged on the side of the lower end support end cover 14 of the first-stage booster assembly a1, the second pressure sensor 152 and the second speed sensor 156 are both arranged on the side of the support end cover 14 between the first-stage booster assembly a1 and the second-stage booster assembly a2, the third pressure sensor 153 and the third speed sensor 157 are both arranged on the side of the support end cover 14 between the second-stage booster assembly a2 and the third-stage booster assembly a3, and the fourth pressure sensor 154 and the fourth speed sensor 158 are both arranged on the side of the upper end support end cover 14 of the third-stage booster assembly a3. This can improve the accuracy of the measurement results.

[0080] As Figure 2As shown in Figs. 8-10, the buffer assembly 2 comprises an annular buffer seat 21, an annular steel support 22, an annular steel pad 23, an annular buffer cavity 24, buffer springs 25 and a rubber gasket 26. The annular buffer cavity 24 is arranged in the annular buffer seat 21, and the 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 buffer inner steel plate 211, a cylindrical buffer outer steel plate 212, an annular buffer bottom plate 213 and an annular steel clamping plate 214. The annular steel clamping plate 214 is provided with an annular notch that is in communication with the annular buffer cavity 24. The size of the annular notch is adapted to the size of the annular steel support 22. The annular notch can guide the annular steel support 22. One end of the annular steel support 22 is connected to the support end cover 14, and the other end extends through the annular notch into the annular buffer cavity 24 and is connected to the annular steel pad 23. The annular steel pad 23 is in contact with or connected to the buffer springs 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. The annular buffer cavity 24 guides the annular steel pad 23. The annular steel pad 23 has a larger ring width than the annular notch, which can prevent the annular steel support 22 from moving out of the annular buffer cavity 22 of the buffer assembly 2. The rubber gasket 26 is arranged between the support end cover 14 and the annular buffer seat 21, and is sleeved on the outside of the annular steel support 22. The rubber gasket 26 can prevent the support end cover 14 and the annular buffer seat 21 from colliding, and can guide the annular steel support 22.

[0081] The power assembly, pressure sensor and speed sensor of the electromagnetic shaftless pump multi-stage pressurizing assembly are turned on, the rotational speed of the electromagnetic shaftless pump multi-stage pressurizing assembly is adjusted step by step according to the monitoring data of the pressure sensor and the speed sensor, and the concrete is pumped to the corresponding position of the high-rise building by the concrete pump. The pressurizing value is determined by the monitoring data, and the pressurizing value is distributed to the electromagnetic shaftless pump multi-stage pressurizing assembly in the form of step-by-step full-load pressurization to determine the rotational speed of the electromagnetic shaftless pump multi-stage pressurizing assembly. The step-by-step full-load pressurization refers to that the concrete is pressurized step by step by the electromagnetic shaftless pump multi-stage pressurizing assembly, when the pressurization of a certain stage reaches full load, the next stage continues to pressurize the concrete, until the required pressurizing value is reached, that is, when the required pressurizing value is reached, the following stages are standby and do not rotate, which can save energy. In the embodiment, the electromagnetic shaftless pump multi-stage pressurizing assembly has three stages, when the required pressurizing value can be reached by opening one stage, the first stage is opened, and the second and third stages are not opened; when the required pressurizing value can be reached by opening two stages, the first and second stages are opened, and the third stage is not opened, at this time, the first stage is in full load, and the second stage is in full load or not in full load; when the required pressurizing value can be reached by opening three stages, the first, second and third stages are opened, at this time, the first and second stages are in full load, and the third stage is in full load or not in full load.

[0082] wherein the rotational speed of the electromagnetic shaftless pump multi-stage pressurizing assembly needs to be calculated, specifically, the calculation method of the rotational speed of the electromagnetic shaftless pump multi-stage pressurizing assembly includes:

[0083] wherein the length of the electromagnetic shaftless pump multi-stage pressurizing assembly is ΔL, and there are j0 stages of pressurizing assemblies, j = 1, 2, 3, … j … j0, and the length of each stage of pressurizing assembly is δ = ΔL / j0;

[0084] wherein the inner diameter of the pressurizing assembly is d, the unit is m, the self weight of the pumped concrete is γ, the unit is N / m 3 , and g is the acceleration of gravity, g = 9.8 m / s 2 ;

[0085] The electromagnetic shaftless pump multi-stage pressurizing assembly vertically pumps concrete, and the pressure loss Δp of the pumped concrete is composed of Δp Vc and Δp γ , wherein Δp Vcis the pressure loss along the pipeline of concrete, including the resistance caused by the viscosity of concrete and the friction resistance caused by the flow of concrete; Δp γ is the pressure loss caused by the gravity of concrete when the concrete is pumped vertically, i.e. the total pressure loss Δp FI of the concrete pumped vertically upward in each booster assembly is:

[0086] Δp FI = Δp Vc + Δp γ Equation 1;

[0087] If the pumped concrete is ordinary concrete, the pressure loss along the pipeline Δp Vcm of the concrete pumped vertically upward per meter is:

[0088]

[0089] wherein Δp Vcm is the pressure loss per meter of the concrete flowing in the vertical conveying pipeline, with the unit of Pa / m; d is the diameter of the concrete conveying pipeline, with the unit of m; K1 is the viscosity coefficient, with the unit of Pa; K2 is the velocity coefficient, with the unit of Pa.s / m; S1 is the slump of the concrete, with the unit of 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 performance of the equipment is unknown; v m is the average flow velocity of the concrete mixture in the conveying pipeline, with the unit of m / s; α is the ratio of the radial pressure to the axial pressure, which is taken as 0.90 for ordinary concrete; β is the conversion coefficient, which is taken as 3, 4 and 5 respectively when d / 2 is 100, 125 and 150 mm;

[0090] The pressure loss Δp γm per meter of the gravity of the concrete when the concrete is pumped vertically (with the unit of Pa / m) is:

[0091] Δp γm = γ Equation 3;

[0092] By substituting Equation 2 and Equation 3 into Equation 1, the total pressure loss Δp FI of the concrete pumped vertically upward in each booster assembly is:

[0093]

[0094] The pressure p w (With the unit of Pa / m) generated by the jth booster assembly to the pumped concrete is:

[0095] p w = γv 2 / 2g = γ [v1 / (πnR / 30v0)] 2 / 2g Equation 5;

[0096] wherein: v is the flow velocity provided by the jth stage of the supercharging assembly for the concrete, in m / s, v = v1 / (ωR / v0) = v1 / (πnR / 30v0); ω is the angular velocity of each stage of the supercharging assembly, in rad / s; n is the rotational speed, in r / min; R is the blade radius, in m; v0 is the tip speed, in m / s; and v1 is the root speed, in m / s;

[0097] Suppose that the electromagnetic shaftless pump-driven multi-stage supercharging device requires an output concrete pressure of p eh , the concrete axial pressure entering the electromagnetic shaftless pump-driven multi-stage supercharging device is p s , and m (m < j0) stages of the supercharging assembly reach the rated pressure p we , then:

[0098]

[0099] Letting equation 5 equal equation 6, the rotational speed n of the m+1th stage of the supercharging assembly for recovering the required output pressure p eh is:

[0100]

[0101] The concrete radial pressure p d at the inlet of the supercharging assembly is monitored by a pressure sensor. For ordinary concrete, the ratio α of the concrete radial pressure p d to the axial pressure p s in the conveying pipeline is 0.90, so the concrete axial pressure p s entering the electromagnetic shaftless pump-driven multi-stage supercharging device is p d / α.

[0102] The concrete axial pressures p s1 , p s2 , p s3 …p sj0 at the inlets of each stage of the supercharging assembly and the concrete axial pressure p se at the outlet of the last stage of the supercharging assembly are monitored by pressure sensors in the electromagnetic shaftless pump-driven multi-stage supercharging device.

[0103] The concrete flow velocities v m1 , v m2 , v m3 …v mj0 at the inlets of each stage of the supercharging assembly and the concrete flow velocity v e at the outlet of the last stage of the supercharging assembly are monitored by velocity sensors in the electromagnetic shaftless pump-driven multi-stage supercharging device.

[0104] If the radius from the rotation center to the blade tip is r0 (unit: m) and the radius from the rotation center to the blade root is r1 = d / 2 (unit: m), the tip rotating speed of the blade is v0 = πnr0 / 30, the root rotating speed of the blade is v1 = πnr1 / 30, and v0, v1 and v m(m+1) By substituting equation 7, the rotating speed n of the m+1 stage supercharging assembly for recovering the required output pressure can be obtained m+1

[0105]

[0106] The rotating speed n of the m stage supercharging assembly is j (j≤m) are respectively

[0107]

[0108] If the pumped concrete is high-strength concrete, the pressure loss per meter Δp Vum

[0109] Δp Vcm = Δp Vum = 0.015 + 0.057η equation 10

[0110] In the equation, Δp Vum is the pressure loss per meter of the high-strength concrete vertical conveying pipe; η is the plastic viscosity;

[0111] By combining equation 3, equation 4, equation 5, equation 6 and equation 10, for high-strength concrete, the rotating speed n of the m+1 stage supercharging assembly for recovering the required output pressure is m+1

[0112]

[0113] The rotating speed n of the m stage supercharging assembly is j (j≤m) are respectively

[0114]

[0115] The beneficial technical effects of the embodiment are:

[0116] (1) The initial pumping pressure of high-rise buildings is reduced, the construction safety is ensured, the pressure requirement of the pumping equipment and the strength requirement of the conveying pipe are reduced, and the equipment cost investment is reduced;

[0117] (2) The electromagnetic shaftless pump pushing multi-stage supercharging device can increase the pumping height of the pumped concrete;

[0118] (3) The electromagnetic shaftless pump pushing multi-stage supercharging device has a large internal space of the pipe, which is beneficial to the pumping of concrete;

[0119] ​​​(4) The concrete pumping pressure is monitored in real time, the number of opening pressurizing components is adjusted in real time when pressurizing, the pressurizing is gradually full load, and the efficiency is high and energy is saved;

[0120] (5) The electromagnetic shaftless pump pushing multi-stage pressurizing device added at the hose can guarantee that the pouring pressure meets the requirements, and the poured concrete is more compact.

[0121] Although the above embodiments have been described in detail with reference to the accompanying drawings, those skilled in the art can recognize that various improvements and changes can be made to the present application without departing from the scope defined by the claims, and therefore, detailed description is not given here.

Claims

1. A method for electromagnetic shaftless pump pushing and stepwise full load pumping of super high-rise concrete, characterized in that The pumping method comprises: arranging a concrete machine on the ground, connecting a delivery pipe and a grouting hose on the concrete machine in sequence, so that the grouting hose extends to a corresponding position of the high-rise building; The delivery pipe is provided with an electromagnetic shaftless pump multi-stage pressurizing device, which comprises a plurality of pressurizing assemblies, two buffer assemblies and two connecting pipes, the pressurizing assemblies are sequentially arranged, the first and last pressurizing assemblies are connected with the two buffer assemblies respectively, and the two buffer assemblies are connected with the two connecting pipes respectively; the pressurizing assembly comprises a rotor assembly and a power assembly, the power assembly comprises a stator core, a stator tooth pole and a coil, the stator core is arranged circumferentially along a cylindrical protective cover, the coil is installed in the stator core, the stator tooth pole is connected with the stator core, and the rotating magnetic field generated by the power assembly drives the rotor assembly to rotate; the pressurizing assembly is provided with blades, a pressure sensor and a speed sensor; The power assembly, the pressure sensor and the speed sensor of the pressurizing assembly of the electromagnetic shaftless pump multi-stage pressurizing device are turned on, the rotational speed of the pressurizing assembly of the electromagnetic shaftless pump multi-stage pressurizing device is adjusted step by step by using the monitoring data of the pressure sensor and the speed sensor, and the concrete is pumped to the corresponding position of the high-rise building through the concrete machine; the pressurization value is determined by monitoring data, and the pressurization value is distributed to the pressurizing assembly of the electromagnetic shaftless pump multi-stage pressurizing device in a step-by-step full-load pressurization manner to determine the rotational speed of the pressurizing assembly of the electromagnetic shaftless pump multi-stage pressurizing device; here, the step-by-step full-load pressurization means that the pressurizing assembly of the electromagnetic shaftless pump multi-stage pressurizing device pressurizes the concrete step by step, when the pressurization of the concrete by a certain stage of the pressurizing assembly reaches full load, the next stage of the pressurizing assembly continues to pressurize the concrete until the required pressurization value is reached; wherein the rotational speed of the pressurizing assembly of the electromagnetic shaftless pump multi-stage pressurizing device needs to be calculated; The calculation method of the rotational speed of the pressurizing assembly of the electromagnetic shaftless pump multi-stage pressurizing device comprises: Let electromagnetic shaftless pump push multi-stage supercharging device length is Δ L , total j 0 stage supercharging assembly, j = 1, 2, 3, … j … j 0, then each stage supercharging assembly length is δ = Δ L / j 0; Let the inner diameter of the pressure boosting assembly be d , the self-weight of the pumped concrete be γ , g be the acceleration of gravity; The electromagnetic shaftless pump pushing multi-stage pressurizing device pumps concrete vertically upward, and the pressure loss ∆ p of the concrete during pumping is p Vc and ∆ p γ is composed of two parts, wherein ∆ p Vc is the along-the-way loss of the concrete during flowing in the pump pipe, including the resistance generated by the viscosity of the concrete and the frictional resistance generated by the flowing of the concrete; and ∆ p γ is the pressure generated by the gravity of the concrete during vertical pumping, i.e. the total pressure loss ∆ p FI of the concrete during vertical upward pumping in each pressurizing assembly. Δ p FI = Δ p Vc + Δ p γ Formula 1; If the pumped concrete is ordinary concrete, the pressure loss per meter of pipeline, ΔP, for pumping vertically upward is: p Vcm is: Formula 2; wherein: Δ p Vcm is the pressure loss per meter of concrete flowing in the vertical delivery pipe; d is the diameter of the concrete delivery pipe; K 1 is the viscosity coefficient; K 2 is the velocity coefficient; S 1 is the slump of the concrete; t 2 / t 1 is the ratio of the switching time of the concrete pump distribution valve to the time of the piston pushing the concrete, when the performance of the equipment is unknown, 0.30 is taken; v m is the average flow velocity of the concrete mixture in the delivery pipe; α is the ratio of the radial pressure to the axial pressure, 0.90 is taken for ordinary concrete; β is the conversion coefficient, d / 2 are respectively 100, 125, 150 mm, β 3, 4, 5 are taken; Pressure generated by the weight of concrete per meter of concrete when pumped vertically ΔP p γm is: Δ p γm = γ Formula 3; Substituting equations 2 and 3 into equation 1 gives the total pressure loss, Δ, for vertical upward pumping of concrete in each stage of the booster assembly. p FI is: Formula 4; The first j Pressure generated by the pumping concrete p w To: Formula 5; where: v is the first j stage booster assembly provides a flow rate of concrete, ; ω is the angular velocity of each stage booster assembly; n is the rotational speed; R is the blade radius; v 0 is the tip speed; v 1 is the root speed; The electromagnetic shaftless pump pushing multi-stage pressure boosting device requires the output concrete pressure to be p eh The axial pressure of the concrete entering the electromagnetic shaftless pump pushing multi-stage pressure boosting device is p s If there are m stage pressure boosting components reaching the rated pressure p we , m < j 0, then: Formula 6; Letting equation 5 equal equation 6, the following is obtained for recovering the required output pressure p eh When the first m The rotational speed of the +1 stage supercharging assembly n m+1 is: 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 pressure sensor monitors the concrete shaft pressure at the inlet of each booster assembly in the electromagnetic shaftless pump booster device p s1 、 p s2 、 p s3 … p sj0 and the concrete shaft pressure at the outlet of the last booster assembly p se ; The speed sensor monitors the concrete flow rate at the inlet of each stage of the multi-stage pressurizing assembly by means of an electromagnetic shaftless pump v m1 、 v m2 、 v m3 … v mj0 and the concrete flow rate at the outlet of the last stage of the pressurizing assembly 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; Before m The rotational speed of the supercharging assembly n j respectively: Equation 9; In the formulae: j ≤ m ; If the pumped concrete is high-strength concrete, the pressure loss per meter of pipeline, ΔP, for vertical upward pumping is: p Vum is: ∆ p Vcm =∆ p Vum =0.015+0.057 η Formula 10; wherein: Δ p Vum is the pressure loss per meter of vertical concrete delivery pipe; η is the plastic viscosity; Combining formula 3, formula 4, formula 5, formula 6 and formula 10, for high-strength concrete, to restore the required output pressure, the first m The rotation speed of the +1 stage supercharging assembly n m+1 is: Formula 11; Before m the rotational speed of the supercharging assembly n j respectively: Formula 12.

2. A method of electromagnetic shaftless pump pushing and stepwise full load pumping of superhigh layer concrete as claimed in claim 1, characterized in that The pressurizing assembly further comprises a cylindrical protective cover and a support end cover, the rotor assembly and the power assembly are both installed in the cylindrical protective cover, and the support end cover is arranged at both ends of the cylindrical protective cover.

3. A method of electromagnetic shaftless pump pushing and step full load pumping of super high-rise concrete as claimed in claim 2, characterized in that The rotor assembly comprises a steel cylinder, an annular sliding block, the blades and permanent magnets, the annular sliding block is arranged at both ends of the steel cylinder, the blades are arranged circumferentially along the inner wall of the steel cylinder, and the permanent magnets are arranged circumferentially along the outer wall of the steel cylinder; the cylindrical protective cover is provided with an annular sliding groove matched with the annular sliding block.

4. A method of electromagnetic shaftless pump pushing and step full load pumping of super high-rise concrete as claimed in claim 2, characterized in that The pressure sensors are arranged circumferentially along the inner side of the support end cover, each speed sensor is located between two adjacent pressure sensors, and the pressure sensors and the speed sensors are electrically connected to a processor respectively.

5. A method of electromagnetic shaftless pump pushing and step full load pumping of super high-rise concrete as claimed in claim 2, characterized in that The buffer assembly comprises a ring-shaped buffer seat, a ring-shaped buffer cavity arranged in the ring-shaped buffer seat, a plurality of buffer springs arranged along the ring direction of the ring-shaped buffer cavity, and a ring-shaped steel support connected to one end of the supercharging assembly, the other end of the ring-shaped steel support extending into the ring-shaped buffer cavity and connected with a ring-shaped steel pad, the ring-shaped steel pad being in contact with or connected to the buffer springs in the ring-shaped buffer cavity.

6. A method of electromagnetic shaftless pump pushing and step full load pumping of super high-rise concrete as claimed in claim 5, characterized in that A rubber gasket is arranged between the support end cover and the ring-shaped buffer seat, the rubber gasket being sleeved outside the ring-shaped steel support.

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