A device and method for adjusting the viscosity and flowability of cement slurry.

Abstract

This invention discloses a device and method for adjusting the viscosity and flowability of cement slurry. The device includes a support arm, a weighing device, an upper-layer mixture storage tank, an upper-layer mixture delivery pipeline, an upper-layer mixture delivery pipeline electronic valve, an upper-layer mixing tank, a slurry delivery pipe, a slurry delivery pipeline electronic valve, a slurry delivery pipeline flow meter, a slurry supply pipe, a slurry supply pipe flow meter, a slurry supply pipe electronic valve, a lower-layer mixture storage tank, a lower-layer mixture delivery pipeline, a lower-layer mixture delivery pipeline electronic valve, a lower-layer mixing tank, mixing blades, and a slurry outlet pipe. The weighing device is fixed on the support arm. The upper-layer mixture addition device is located above the upper-layer mixing tank, and the lower-layer mixture addition device is located above the lower-layer mixing tank. The upper-layer mixing tank is located above the lower-layer mixing tank. The delivery pipeline electronic valve divides the pipeline into multiple spaces. By controlling the opening and closing of specific valves, the mixture can be quantitatively added, and the viscosity and flowability of the cement slurry can be adjusted. The slurry flow rate can be measured by the slurry supply pipeline flow meter, thereby determining the slurry viscosity.

Description

Technical Field

[0001] This invention belongs to the field of curtain grouting devices and construction. Using this device and method, controllable cement grout with different viscosities and fluidities can be quickly and continuously prepared on the engineering site. Background Technology

[0002] Currently, in grouting and seepage prevention projects, cement grout alone cannot quickly seal the flowing water in karst, large channels, and high water flow conditions, and the effective utilization rate of the grout is low. Grouting technicians have developed various powdered mixtures based on project needs. After the mixtures are mixed with cement grout in a specific ratio, the viscosity of the grout can be quickly increased.

[0003] During on-site construction, the addition of the grout requires manual operation by technicians, and the accuracy of the grout addition is related to the experience of the technicians. This leads to low construction efficiency, low effective utilization rate of grout, and excessive reliance on the experience of technicians for project quality. Summary of the Invention

[0004] The purpose of this invention is to design a device and method for precisely controlling the addition quality of a mixture using a weighing device and an electronic valve. The mixture addition device includes an upper layer and a lower layer addition device. After the upper layer addition device completes the slurry preparation, the slurry flow rate is measured by a slurry supply pipe flow meter, and the slurry fluidity and viscosity are calculated. At the same time, the measured values ​​are compared with the design values ​​and corrected by the lower layer addition device to further improve the slurry preparation accuracy.

[0005] The present invention adopts the following technical solution: A device and method for adjusting the viscosity and flowability of cement slurry, comprising a support arm, a slurry delivery pipe, an electronic valve for the slurry delivery pipe, a flow meter for the slurry delivery pipe, an upper layer mixture weighing device, an upper layer mixture storage tank, an upper layer mixture delivery pipe, an electronic valve for the upper layer mixture delivery pipe, an upper layer mixing tank weighing device, an upper layer mixing tank, an upper layer mixing tank agitator, a slurry supply pipe, a slurry supply pipe flow meter, a lower layer mixture storage tank, a lower layer mixture weighing device, a lower layer mixture delivery pipe, an electronic valve for the lower layer mixture delivery pipe, a lower layer mixing tank, a lower layer mixing tank agitator, and a slurry outlet pipe; one end of the weighing device is connected to the support arm, and the other end is connected to the upper layer mixture adding device, the upper layer mixing tank, and the lower layer mixture adding device respectively; the upper layer mixture adding device is located at the top of the upper layer mixing tank, the lower layer mixture adding device is located at the top of the lower layer mixing tank, and the upper layer mixing tank is located at the top of the lower layer mixing tank.

[0006] By installing a flow meter in the slurry delivery pipeline, the volume of slurry with a specific water-cement ratio delivered in the upper mixing tank can be measured. The total mass of the slurry in the tank can be measured by a weighing device. Since the mass of the slurry can be obtained from the slurry volume based on the slurry density, the mass values ​​measured by the flow meter and the weighing device can be compared. If the error exceeds 5%, the average value of the two values ​​can be taken to improve the accuracy of slurry preparation.

[0007] Furthermore, the dry weight of cement can be obtained based on the slurry quality and water-cement ratio. The addition ratio of the admixture is determined based on the set values ​​of slurry viscosity and fluidity and the results of indoor tests, and then the mass of admixture added is calculated.

[0008] Furthermore, based on the calculated mass value of the additive, the quantitative addition of the additive is completed by controlling the electronic valve of the upper additive delivery pipeline, and the accuracy of the added mass can be verified by the changes in the values ​​of the upper additive weighing device and the upper mixing tank weighing device; then the slurry is fully stirred by the stirring blades of the upper mixing tank.

[0009] After mixing, under the pressure of the slurry's own weight, the upper slurry mixing tank supplies slurry to the lower slurry mixing tank through the slurry supply pipe. The flow meter of the slurry supply pipe can measure the flow velocity of the slurry. Based on the test results, the viscosity and fluidity of the slurry are determined from the slurry flow velocity. By comparing this value with the set value of the slurry, it is determined whether secondary slurry mixing is required, and the secondary addition value of the mixture is calculated.

[0010] Furthermore, based on the calculated secondary addition value of the mixture, the quantitative addition is completed by controlling the opening and closing of the electronic valve of the lower layer mixture delivery pipeline, and the accuracy of the addition quality can be verified by the value change of the lower layer mixture weighing device; then the slurry is fully stirred by the stirring blades of the lower layer mixing tank.

[0011] Furthermore, after the slurry is thoroughly mixed, it is injected through the slurry outlet pipe.

[0012] If the grout parameters need to be continuously adjusted during the grouting process, the grout can be quantitatively added through the lower-level grout delivery pipeline to adjust the grout viscosity and fluidity. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a device for automatically adjusting the viscosity and fluidity of cement slurry.

[0014] The diagram shows the following markings: 1-Support arm, 2-Weighing device for upper mixing tank, 3-Grouting pipe, 4-Electronic valve for grouting pipe, 5-Flow meter for grouting pipe, 6-Agitator blade for upper mixing tank, 7-Upper mixing tank, 21-Grouting pipe, 8-Electronic valve for grout supply pipe, 9-Flow meter for grout supply pipe, 10-Weighing device for upper mixture, 11-Storage tank for upper mixture, 12-Electronic valve for upper mixture delivery pipe, 13-Upper mixture delivery pipe, 14-Weighing device for lower mixture, 15-Storage tank for lower mixture, 16-Electronic valve for lower mixture delivery pipe, 17-Lower mixture delivery pipe, 18-Agitator blade for lower mixing tank, 19-Lower mixing tank, 20-Grouting outlet pipe, 21-Grouting pipe. Detailed Implementation

[0015] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Example

[0016] like Figure 1 As shown, a device for adjusting the viscosity and flowability of cement slurry includes a support arm 1, an upper mixing tank weighing device 2, a slurry delivery pipe 3, a slurry delivery pipeline electronic valve 4, a slurry delivery pipeline flow meter 5, an upper mixing tank mixing blade 6, an upper mixing tank 7, a slurry supply pipe 21, a slurry supply pipeline electronic valve 8, a slurry supply pipeline flow meter 9, an upper mixing agent weighing device 10, an upper mixing agent storage tank 11, an upper mixing agent delivery pipeline electronic valve 12, an upper mixing agent delivery pipeline 13, a lower mixing agent weighing device 14, and a lower mixing agent... The components include: agent storage tank 15, lower layer agent delivery pipeline electronic valve 16, lower layer agent delivery pipeline 17, lower layer mixing tank agitator blade 18, lower layer mixing tank 19, and slurry outlet pipe 20; one end of the upper layer mixing tank weighing device 2 is fixed to the upper layer mixing tank 7, and the other end is fixed to the support arm 1; one end of the upper layer agent weighing device 10 is fixed to the upper layer agent storage tank 11, and the other end is fixed to the support arm 1; one end of the lower layer agent weighing device 14 is fixed to the lower layer agent storage tank 15, and the other end is fixed to the support arm 1.

[0017] By installing a flow meter 5 in the slurry delivery pipeline 3, the volume of slurry with a specific water-cement ratio delivered in the upper mixing tank can be measured. The total mass of the slurry in the tank can be measured by the weighing device 2. Since the mass of the slurry can be obtained from the slurry volume based on the slurry density, the mass values ​​measured by the flow meter and the weighing device are compared. If the error exceeds 5%, the average value of the two is taken, which can improve the accuracy of slurry preparation.

[0018] In this embodiment, the total mass of the upper mixing tank and cement slurry measured by the weighing device 2 is M1kg, the mass of the upper slurry mixing tank is M2kg, the water-cement ratio of the cement slurry transported by the slurry delivery pipeline 3 is 1:1, the volume measured by the slurry delivery pipeline flow meter 5 is V1L, and the density of the slurry is... ,but The dry weight of cement is .

[0019] The viscosity and fluidity of the slurry are set according to the engineering requirements, and the proportion of the additive is determined based on the results of indoor tests, thereby calculating the mass of additive.

[0020] The upper mixing agent delivery pipeline 13 has multiple electronic valves, which divide the pipeline into multiple equal-volume compartments. Each compartment can store a fixed amount of mixing agent. The quality of mixing agent addition can be precisely controlled by opening specific valves. While adding the mixing agent, the stirring blade 15 is rotated to ensure that the slurry is fully stirred.

[0021] After mixing, under the pressure of the slurry's own weight, the upper slurry mixing tank 7 supplies slurry to the lower slurry mixing tank 19 through the slurry supply pipe 21. The flow meter 9 of the slurry supply pipe can measure the flow rate of the slurry. Based on the test results, the viscosity and fluidity of the slurry are determined by the slurry flow rate. By comparing this value with the parameter setting value of the slurry, it is determined whether secondary slurry mixing is required, and the secondary addition value of the mixture is calculated.

[0022] The lower-level mixing agent delivery pipeline 17 contains multiple electronic valves, which divide the pipeline into multiple equal-volume sections. Each section can be set to store a fixed amount of mixing agent according to project needs. The quality of the added mixing agent can be precisely controlled by controlling the valve opening and closing, and the value of the weighing device 14 is calibrated by the change of the value. While adding the mixing agent, the stirring blade 18 is rotated to make the slurry fully mixed. After the slurry is evenly mixed, it is grouted through the slurry outlet pipe 20.

Claims

1. A device for adjusting the viscosity and flowability of cement slurry, characterized in that: Includes a support arm, an upper mixing tank weighing device, a slurry delivery pipe, an electronic valve for the slurry delivery pipe, a flow meter for the slurry delivery pipe, a mixing blade for the upper mixing tank, an upper mixing tank, a slurry supply pipe, an electronic valve for the slurry supply pipe, a flow meter for the slurry supply pipe, an upper layer mixture weighing device, an upper layer mixture storage tank, an electronic valve for the upper layer mixture delivery pipe, an upper layer mixture delivery pipe, a lower layer mixture weighing device, a lower layer mixture storage tank, an electronic valve for the lower layer mixture delivery pipe, a lower layer mixture delivery pipe, a mixing blade for the lower mixing tank, a lower mixing tank, and a slurry outlet pipe; slurry delivery pipe The system includes: a slurry delivery pipeline electronic valve and a slurry delivery pipeline flow meter forming a slurry supply system; an upper layer mixture weighing device, an upper layer mixture storage tank, an upper layer mixture delivery pipeline electronic valve, an upper layer mixture delivery pipeline, a lower layer mixture weighing device, a lower layer mixture storage tank, a lower layer mixture delivery pipeline electronic valve, and a lower layer mixture delivery pipeline forming a mixture delivery system; and a slurry supply pipe, a slurry supply pipe electronic valve, and a slurry supply pipeline flow meter forming a slurry viscosity and fluidity testing system; the system also includes the following steps: ① controlling the slurry delivery pipeline electronic valve and the slurry delivery pipeline flow meter...

1. Measure the volume of cement slurry added to the upper mixing tank. Based on the slurry density, derive the mass from the slurry volume. Measure the total mass of the slurry in the upper mixing tank using a weighing device. Compare this mass with the mass values ​​measured by the flow meter and the weighing scale. If the error exceeds 5%, take the average of the two values ​​to calculate the cement dosage. Simultaneously, determine the amount of additive to be added based on the set slurry viscosity and flowability parameters.

2. Precisely control the amount of additive added to the upper mixing tank by opening and closing a specific electronic valve on the upper additive delivery pipeline.

3. Open the slurry supply pipeline. The electronic valve measures the slurry flow rate through the slurry supply pipeline flow meter and calculates the slurry viscosity and fluidity; ④ By comparing the slurry fluidity and viscosity measured by the slurry supply pipeline flow meter with the set slurry fluidity and viscosity, the mass of additive to be added is calculated, and then the additive is added through the lower-level additive delivery pipeline to improve the accuracy of slurry preparation; ⑤ During the grouting process, the slurry parameters are adjusted in a timely manner based on the grouting pressure and flow rate, and the mass of additive to be added is calculated, and then quantitatively added through the lower-level additive delivery pipeline.

2. The device for adjusting the viscosity and fluidity of cement slurry as described in claim 1, characterized in that, The weighing devices for the upper mixing tank, the upper mixture, and the lower mixture are all fixed on the support arm.

3. The device for adjusting the viscosity and fluidity of cement slurry as described in claim 1, characterized in that, The grout delivery pipe has an electronic valve for grout delivery and a flow meter for grout delivery.

4. The device for adjusting the viscosity and fluidity of cement slurry as described in claim 1, characterized in that, The upper-level mixture delivery pipeline has multiple electronic valves that divide the pipeline into multiple equal-sized compartments, each of which stores a fixed mass of mixture.

5. The device for adjusting the viscosity and flowability of cement slurry as described in claim 1, characterized in that, The grout supply pipe has an electronic valve and a flow meter, which measures the flow rate of the grout.

6. The device for adjusting the viscosity and flowability of cement slurry as described in claim 1, characterized in that, According to engineering needs, the electronic valve can divide the upper and lower mixing agent delivery pipelines into multiple unequal sections, and each section stores different quality mixing agents according to the design combination.

7. The device for adjusting the viscosity and fluidity of cement slurry as described in claim 1, characterized in that, The method for calculating the mass of the mixture added in step ④ or ⑤ is based on indoor test results and theoretical derivation.

8. The device for adjusting the viscosity and flowability of cement slurry as described in claim 1, characterized in that, The method for calculating slurry viscosity and fluidity based on slurry flow rate in step ③ is based on indoor test results and theoretical derivation.

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