Dynamic water washing device and method for testing spatial distribution of viscosity of magnetic slurry

Abstract

The invention belongs to a civil engineering material testing technology, and particularly provides a flowing water scouring device and method for testing magnetic slurry viscosity spatial distribution, the flowing water scouring device comprises a water supply device, the water supply device supplies water to a scouring test pipe, the scouring test pipe is made of a transparent material, and a magnetic adsorption mechanism is arranged outside or inside the scouring test pipe; the magnetic adsorption mechanism is used for adsorbing magnetic slurry, the magnetic slurry is arranged in the scouring test tube, at least one group of porous chucks are further arranged in the scouring test tube, a plurality of scouring holes are formed in the porous chucks, and the magnetic slurry is arranged at the downstream of the porous chucks. The device can simulate different magnetic field environments and is used for measuring the viscosity space distribution of the magnetic slurry under different magnetic field intensities.

Description

Technical Field

[0001] The present invention belongs to the testing technology of civil engineering materials. Specifically, it relates to a hydrodynamic scouring device and method for testing the spatial distribution of the viscosity of magnetic slurry. Background Art

[0002] As a key material in civil engineering, the viscosity distribution of concrete slurry is crucial. During the process of the directional movement of magnetic slurry under magnetic induction, the magnetic powder in the magnetic slurry will redistribute, resulting in the possibility that the viscosity distribution becomes uneven. Traditional testing methods are difficult to accurately reflect the viscosity distribution characteristics of magnetic powder under different magnetic field intensities. There are no relevant testing devices and methods currently. This technology is proposed based on this demand. By optimizing the experimental device and testing method, this technology aims to achieve the measurement of the viscosity distribution of magnetic slurry under different magnetic field intensities, and at the same time, it is also applicable to the testing of ordinary slurry with viscosity varying with space distribution, providing reliable technical support for the application of new materials, thereby improving the engineering quality and performance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a hydrodynamic scouring device and method for testing the spatial distribution of the viscosity of magnetic slurry, which simulates different magnetic field environments and is used to measure the spatial distribution of the viscosity of magnetic slurry under different magnetic field intensities.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: A hydrodynamic scouring device for testing the spatial distribution of the viscosity of magnetic slurry, including a water supply device, the water supply device supplies water to a scouring test tube. The scouring test tube is made of transparent material, and a magnetic adsorption mechanism is provided outside or inside the scouring test tube. The magnetic adsorption mechanism is used to adsorb the magnetic slurry. There is magnetic slurry in the scouring test tube, and at least one set of porous chucks is also provided in the scouring test tube. A number of scouring holes are provided on the porous chucks, and the magnetic slurry is arranged downstream of the porous chucks.

[0005] In a preferred solution, the scouring test tube is a "U"-shaped groove tube with an upper opening, and a clamping groove for cooperating with the porous chuck is provided on the inner wall of the "U"-shaped groove tube.

[0006] In a preferred solution, the magnetic adsorption mechanism is a magnet, and the magnet is arranged at the bottom of the "U"-shaped groove tube.

[0007] In a preferred solution, the scouring test tube is a cylindrical water pipe, a limiting slot hole for inserting the porous chuck is provided at the top of the cylindrical water pipe, and one set of limiting slot holes is provided. The magnetic adsorption mechanism is a magnetic rod, and the magnetic rod is inserted from the tail end of the cylindrical water pipe. After the magnetic rod adsorbs the magnetic slurry, it plugs the tail end of the cylindrical water pipe.

[0008] In a preferred embodiment, an intake pipe connected to the gas supply system is provided on the side wall of the cylindrical water pipe. The intake pipe is connected to the supply pipe of the gas supply system through a pressure regulating valve, and the intake pipe is arranged upstream of the limiting slot hole.

[0009] In a preferred embodiment, the magnetic adsorption mechanism is a magnetic rod. The magnetic rod is inserted from the tail end of the cylindrical water pipe, and after adsorbing the magnetic slurry, the tail end of the cylindrical water pipe is blocked.

[0010] In a preferred embodiment, the water supply device includes a water supply pipe. The water supply pipe is connected to the end of the scouring test pipe, and the water supply pipe is connected to a water source through a water pump.

[0011] In a preferred embodiment, the water supply device further includes a water collection tank. The water supply pipe is sequentially connected to the water collection tank and the scouring test pipe.

[0012] In a preferred embodiment, a water pump controller is provided on the water supply pipe for adjusting the water supply pressure of the water supply pipe.

[0013] In a preferred embodiment, the mass ratio of the magnetic slurry is 100 parts of portland cement, 40 parts of water, 6 parts of type A epoxy resin emulsion, 5 parts of type B epoxy resin curing agent, 0.2 part of polycarboxylate superplasticizer, and 5 - 50 parts of magnetic powder.

[0014] The present invention also provides a test method for a hydrodynamic scouring device for testing the viscosity spatial distribution of magnetic slurry, including the following steps: Step1: Connect the scouring test pipe to the water supply device; Step2: Mix cement and magnetic powder particles evenly according to a predetermined ratio to prepare magnetic slurry; Step3: If the scouring test pipe selected is a "U" - shaped groove pipe, directly pour the prepared magnetic slurry into the "U" - shaped groove pipe; If the scouring test pipe selected is a cylindrical water pipe, wrap the prepared magnetic slurry around the magnetic rod, and then insert the magnetic rod into the tail end of the cylindrical water pipe; Step4: Insert a porous chuck into the clamping groove of the "U" - shaped groove pipe. A plurality of porous chucks are provided, and the heights of the scouring holes of the plurality of porous chucks are set differently; if a cylindrical water pipe is selected, a set of porous chucks is provided; Step5: Open the water supply device, adjust the water supply pressure of the water supply device, and the water flows out from the scouring holes of the porous chuck to scour the magnetic slurry; Step6: Use a high - definition digital camera to take pictures, record the changing shape of the magnetic slurry and the remaining amount of the magnetic slurry after scouring, for studying the viscosity spatial distribution of the magnetic slurry under the combined action of different magnetic induction intensities or different water pressures or different air pressures; Step 7. Replace the porous chucks with different opening positions and quantities, change the single variable, and repeat Steps 4 to 6 to conduct scouring test comparisons.

[0015] The hydrodynamic scouring device and method for testing the viscosity spatial distribution of magnetic slurry provided by the present invention have the following beneficial effects: 1. Precise measurement of viscosity distribution: By setting a transparent scouring test tube and a magnetic adsorption mechanism, it is possible to directly observe the changes in magnetic slurry after being scoured by water flow under different magnetic field environments. Combining the scouring holes at different heights of the porous chuck and the adjustable water supply pressure, the viscosity spatial distribution of magnetic slurry under the combined action of different magnetic induction intensities, water pressures, etc. can be accurately measured, making up for the defect that traditional test methods are difficult to accurately reflect the viscosity distribution characteristics of magnetic slurry under different magnetic field intensities.

[0016] 2. Strong adaptability to multi-scene testing: The scouring test tube has two structures, namely a "U"-shaped groove tube and a cylindrical water pipe. Combined with different magnetic adsorption mechanisms (magnets and magnetic rods), it can simulate a variety of test scenarios to meet different experimental requirements. It is not only applicable to magnetic slurry but also can be extended to the testing of ordinary slurry with viscosity varying spatially, broadening the application scope of the device and method.

[0017] 3. Simple and efficient experimental operation: The device has a simple structure, and the connection and operation of each component are convenient. The steps of the test method are clear. By replacing the porous chuck with different opening positions and quantities, the single variable can be quickly changed for comparative testing, greatly improving the experimental efficiency and facilitating researchers to obtain more comprehensive and accurate experimental data, providing strong support for the research and development and application of new materials.

[0018] 4. Optimization of material performance evaluation: Accurately measuring the viscosity spatial distribution of magnetic slurry helps to deeply understand the internal characteristics of materials, provides a data basis for optimizing the performance of civil engineering materials, thereby improving the engineering quality and performance, reducing engineering problems caused by poor material performance, and lowering the engineering construction and maintenance costs. Description of the Drawings

[0019] The following further describes the present invention with reference to the drawings and embodiments: Figure 1 It is a device diagram for measuring the viscosity of slurry by hydrodynamic scouring of the "U"-shaped groove tube involved in the present invention; Figure 2 It is a physical diagram for measuring the viscosity of slurry by hydrodynamic scouring of the "U"-shaped groove tube involved in the present invention; Figure 3 It is a diagram of the decay law of the magnetic induction intensity of the permanent magnet involved in the present invention; Figure 4 It is a diagram of the morphological change of slurry measured by hydrodynamic scouring of the "U"-shaped groove tube involved in the present invention; Figure 5 The test result graph of the viscosity of the slurry measured by using the dynamic water scouring of the "U"-shaped groove pipe involved in the present invention; Figure 6 The device graph of the viscosity of the slurry measured by using the dynamic water scouring of the cylindrical water pipe involved in the present invention; Figure 7 The structural graph of the porous chuck involved in the present invention; Figure 8 Another structural graph of the porous chuck involved in the present invention; Figure 9 The schematic diagram of the viscosity of the slurry measured by using the dynamic water scouring of the cylindrical water pipe involved in the present invention; In the figure: water supply device 100, water supply pipe 110, water collection tank 120, water pump controller 130, scouring test pipe 200, "U"-shaped groove pipe 210, clamping groove 211, cylindrical water pipe 220, limiting groove hole 221, air inlet pipe 230, pressure regulating valve 240, magnetic adsorption mechanism 300, magnet 310, magnetic rod 320, magnetic slurry 400, porous chuck 500, scouring hole 510. Detailed implementation manners

[0020] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] Embodiment 1: As Figure 1 shown, a dynamic water scouring device for testing the spatial distribution of the viscosity of magnetic slurry includes a water supply device 100, and the water supply device 100 supplies water to the scouring test pipe 200.

[0022] In this embodiment, the water supply device 100 includes a water supply pipe 110, and the water supply pipe 110 is connected to the end of the scouring test pipe 200, specifically connected to the front end of the scouring test pipe 200 through a joint. The water supply pipe 110 is connected to the water source through a water pump to form a water supply water path. The scouring test pipe 200 is made of a transparent material, which is convenient for observing and collecting data of the magnetic slurry.

[0023] The front end of the scouring test pipe 200 is closed and is provided with a water inlet connected to the water supply pipe 110, which is convenient for connecting to the water supply pipe 110 through a joint.

[0024] The scouring test pipe 200 is a "U"-shaped groove pipe 210, with specific dimensions of 25mm×80mm×1000mm, and the upper part is open. The inner wall of the "U"-shaped groove pipe 210 is provided with a clamping groove 211 that cooperates with the porous chuck 500.

[0025] A magnetic adsorption mechanism 300 is provided outside or inside the erosion test tube 200. The magnetic adsorption mechanism 300 is used to adsorb the magnetic slurry 400. The magnetic slurry 400 is provided inside the erosion test tube 200. At least one set of porous chucks 500 is also provided inside the erosion test tube 200. A number of erosion holes 510 are provided on the porous chucks 500. The magnetic slurry 400 is arranged downstream of the porous chucks 500.

[0026] In this embodiment, the magnetic adsorption mechanism 300 is a magnet 310. The magnet 310 is arranged at the bottom of the "U"-shaped groove tube 210. The magnet 310 can be a permanent magnet or an electromagnet. It is arranged at the bottom of the middle section of the erosion test tube 200, and can adsorb the magnetic slurry 400 to the bottom of the "U"-shaped groove tube 210. According to the construction conditions, a suitable type of magnet can be selected.

[0027] Multiple sets of porous chucks 500 can be provided. The porous chucks 500 in multiple sets are provided with erosion holes 510 at different heights. According to the requirements of the comparative test, the porous chucks 500 with erosion holes 510 at different heights are selected. The porous chucks 500 are clamped in the clamping groove 211.

[0028] Preferably, the water supply device 100 further includes a water collecting tank 120. The water supply pipe 110 is sequentially connected to the water collecting tank 120 and the erosion test tube 200. By providing the water collecting tank 120, a certain amount of water can be stored to ensure that the water can quickly enter the erosion test tube 200 at the beginning of the test.

[0029] A water pump controller 130 is provided on the water supply pipe 110 for adjusting the water supply pressure of the water supply pipe 110. Specifically, a Jinlong water pump intelligent controller is selected to keep the water pressure provided by the water supply device 100 at a constant value.

[0030] In this embodiment, the mass ratio of the magnetic slurry 400 is 100 parts of portland cement, 40 parts of water, 6 parts of type A epoxy resin emulsion, 5 parts of type B epoxy resin curing agent, 0.2 part of polycarboxylate superplasticizer, and 5 - 50 parts of magnetic powder. By adjusting the content of the magnetic powder, the viscosity of the magnetic slurry 400 is adjusted, so that the viscosity of the magnetic slurry 400 can be adjusted, which is helpful for comparative testing.

[0031] A test method for a hydrodynamic erosion device for testing the viscosity spatial distribution of a magnetic slurry includes the following steps: Step1. Device setup: Select the "U"-shaped groove tube 210 as the erosion test tube 200, and place a magnet 310 at the bottom of the "U"-shaped groove tube 210 as the magnetic adsorption mechanism 300. Connect one end of the water supply pipe 110 to the end of the erosion test tube 200, and connect the other end to a water source through a water pump. Install a water pump controller 130 on the water supply pipe 110 for adjusting the water supply pressure. At the same time, a water collecting tank 120 can be connected to the water supply pipe 110 according to needs.

[0032] Step 2. Slurry preparation: Weigh 100 parts of portland cement, 40 parts of water, 6 parts of type A epoxy resin emulsion, 5 parts of type B epoxy resin curing agent, 0.2 parts of polycarboxylate superplasticizer, and 20 parts of magnetic powder according to the mass ratio of the magnetic slurry 400. The amount of magnetic powder can be selected between 5 - 50 parts according to actual needs. Add these materials into a container in sequence and use a stirring device to fully stir and mix evenly to prepare the magnetic slurry 400.

[0033] Step 3. Pour the prepared magnetic slurry 400 directly into the "U"-shaped trough pipe 210.

[0034] Step 4. Insert the porous chuck 500 into the clamping groove 211 of the "U"-shaped trough pipe 210. Multiple porous chucks 500 are provided, and the heights of the flushing holes 510 of the multiple porous chucks 500 are set differently.

[0035] Step 5. Open the water supply device 100, adjust the water supply pressure of the water supply device 100, and the water flows out from the flushing holes 510 of the porous chuck 500 to flush the magnetic slurry 400. Figure 2 It is a physical diagram for measuring the viscosity of the slurry by flushing with moving water.

[0036] Step 6. Use a high-definition digital camera to take pictures and record the changing shape of the magnetic slurry 400 and the remaining amount of the magnetic slurry 400 after flushing, which is used to study the viscosity spatial distribution of the magnetic slurry under the combined action of different magnetic induction intensities or different water pressures. Step 7. Replace the porous chuck 500 with different opening positions and numbers, change the single variable, and repeat Step 4 - Step 6 for flushing test comparison.

[0037] The magnetic induction intensity near the magnet 310 can be directly measured by a gaussmeter. Figure 3 It is a diagram of the decay law of the magnetic induction intensity of the permanent magnet involved in the present invention.

[0038] Figure 4 It is a diagram for measuring the morphological change of the slurry by flushing with moving water.

[0039] During the test, record the water pressure, as well as the morphology of the magnetic slurry and the water level lines upstream and downstream of the magnetic slurry corresponding to each moment. When the water impacts the magnetic slurry, the punching force of the water on the slurry is balanced with the shear stress received by the slurry, and the rheological model of the slurry is obtained, and then the viscosity of the slurry can be determined.

[0040] Through the test results, it is obtained that at the higher remaining height of the magnetic slurry, the corresponding magnetic intensity is lower and the viscosity of the magnetic slurry is lower. On the contrary, the higher the magnetic field intensity, the higher the viscosity of the magnetic slurry.

[0041] Figure 5It is a test result graph for measuring the viscosity of slurry by using dynamic water scouring.

[0042] Example 2: Different from Example 1, as Figures 6 - 9 shown, the scouring test tube 200 is a cylindrical water pipe 220. A limit slot hole 221 for inserting the porous chuck 500 is provided at the top of the cylindrical water pipe 220, and a set of limit slot holes 221 is provided.

[0043] The magnetic adsorption mechanism 300 is a magnetic rod 320. The magnetic rod 320 is inserted from the tail end of the cylindrical water pipe 220. After the magnetic rod 320 adsorbs the magnetic slurry 400, it seals the tail end of the cylindrical water pipe 220. Specifically, the prepared magnetic slurry 400 is wrapped outside the magnetic rod 320, and then the magnetic rod 320 is inserted into the tail end of the cylindrical water pipe 220 to seal the tail end of the cylindrical water pipe 220, so that the cylindrical water pipe 220 forms a closed cavity. When the water supply device 100 is opened to scour the magnetic slurry 400, as the water pressure increases, part of the magnetic slurry 400 is washed out from the gap between the magnetic rod 320 and the cylindrical water pipe 220 by the water flow.

[0044] Preferably, an air inlet pipe 230 connected to the gas supply system is provided on the side wall of the cylindrical water pipe 220. The air inlet pipe 230 is connected to the gas supply pipe of the gas supply system through a pressure regulating valve 240, and the air inlet pipe 230 is arranged upstream of the limit slot hole 221. In this embodiment, the gas supply system includes a gas compression tank and a gas supply pipe. The valve at the outlet of the gas compression tank is opened, and the cylindrical water pipe 220 is supplied with gas through the gas supply pipe. By setting the pressure regulating valve 240, the air pressure in the cylindrical water pipe 220 is adjusted to study the viscosity spatial distribution of the magnetic slurry under the combined action of different magnetic induction intensities, different water pressures or different air pressures.

[0045] By using a high-definition digital camera to take pictures, the change form of the magnetic slurry and the residual amount after scouring can be recorded. When the pure cement slurry has a dynamic water flow rate of 0.4 m / s, the slurry retention rate is 16.1%, and most of the slurry is washed away by the water flow. When the flow rate is 0.8 m / s, the slurry retention rate is 0.7% and all is lost; while the water erosion resistance of the magnetic slurry is significantly improved. When the flow rate is 0.4 m / s, the magnetic slurry retention rate is 97.3%, and it remains in a fixed area against the external dynamic water scouring. When the flow rate is 0.8 m / s, the retention rate is 74.6%, which is about 106 times higher than that of the pure cement slurry. Through the above comparative tests, the ability of the magnetic slurry to resist external impacts and the regulation effect on the rheological properties of the magnetic slurry under the action of the magnetic field can be tested. The ordinary slurry can be easily washed away by a large amount of water before solidification, but the magnetic slurry can quickly change from a fluid state to a fluid-plastic state under the action of the magnetic field. After testing, the viscosity of the slurry in a 500 GS magnetic field is 107.1 times that without a magnetic field.

[0046] Those skilled in the art can easily understand that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dynamic water flushing device for testing the spatial distribution of magnetic slurry viscosity, characterized in that: The invention comprises a water supply device (100), the water supply device (100) supplies water to a flushing test tube (200), the flushing test tube (200) is made of a transparent material, a magnetic adsorption mechanism (300) is provided outside or inside the flushing test tube (200), the magnetic adsorption mechanism (300) is used to adsorb a magnetic slurry (400), the flushing test tube (200) is provided with a magnetic slurry (400), the flushing test tube (200) is further provided with at least one group of porous chucks (500), the porous chucks (500) are provided with a plurality of flushing holes (510), and the magnetic slurry (400) is provided downstream of the porous chucks (500).

2. A dynamic water flushing device for testing the spatial distribution of magnetic slurry viscosity according to claim 1, characterized in that: The flushing test tube (200) is a "U"-shaped groove tube (210) with an opening at the top. The inner wall of the "U"-shaped groove tube (210) is provided with a clamping groove (211) that cooperates with the porous chuck (500).

3. A dynamic water flushing device for testing the spatial distribution of magnetic slurry viscosity according to claim 2, characterized in that: The magnetic adsorption mechanism (300) is a magnet (310), and the magnet (310) is arranged at the bottom of the "U"-shaped groove tube (210).

4. A dynamic water flushing device for testing the spatial distribution of magnetic slurry viscosity according to claim 1, characterized in that: The flushing test tube (200) is a cylindrical water pipe (220), and a limiting slot hole (221) for inserting a porous chuck (500) is provided at the top of the cylindrical water pipe (220), and a group of limiting slot holes (221) are provided; the magnetic adsorption mechanism (300) is a magnetic rod (320), and the magnetic rod (320) is inserted from the rear end of the cylindrical water pipe (220), and the magnetic rod (320) adsorbs the magnetic slurry (400) and then blocks the rear end of the cylindrical water pipe (220).

5. A dynamic water flushing device for testing the spatial distribution of magnetic slurry viscosity according to claim 4, characterized in that: An air inlet pipe (230) connected to the air supply system is provided on the side wall of the cylindrical water pipe (220); the air inlet pipe (230) is connected to the air supply pipe of the air supply system via a pressure regulating valve (240); the air inlet pipe (230) is arranged upstream of the limiting slot hole (221).

6. A dynamic water flushing device for testing the spatial distribution of magnetic slurry viscosity according to claim 1, characterized in that: The water supply device (100) comprises a water supply pipe (110), the water supply pipe (110) is connected to the end of the flushing test pipe (200), and the water supply pipe (110) is connected to a water source via a water pump.

7. A dynamic water flushing device for testing the spatial distribution of magnetic slurry viscosity according to claim 6, characterized in that: The water supply device (100) further comprises a water collecting tank (120), and the water supply pipe (110) is connected to the water collecting tank (120) and the flushing test pipe (200) in sequence.

8. A dynamic water flushing device for testing the spatial distribution of magnetic slurry viscosity according to claim 6, characterized in that: The water supply pipe (110) is provided with a water pump controller (130) for adjusting the water supply pressure of the water supply pipe (110).

9. A dynamic water flushing device for testing the spatial distribution of magnetic slurry viscosity according to claim 1, characterized in that: The mass ratio of the magnetic slurry (400) is 100 parts of silicate cement, 40 parts of water, 6 parts of type A epoxy resin emulsion, 5 parts of type B epoxy resin curing agent, 0.2 parts of polycarboxylic acid high-efficiency water reducing agent, and 5-50 parts of magnetic powder.

10. A method for testing a dynamic water flushing device for testing the spatial distribution of magnetic slurry viscosity according to claim 3 or 5, characterized in that: The following steps are involved: Step 1, connecting the flushing test tube (200) to the water supply device (100); Step 2, according to a predetermined ratio, cement and magnetic powder particles are mixed evenly to prepare a magnetic slurry (400); Step 3, if the flushing test tube (200) is a "U"-shaped groove tube (210), the prepared magnetic slurry (400) is directly poured into the "U"-shaped groove tube (210); If the flushing test tube (200) is a cylindrical water pipe (220), the prepared magnetic slurry (400) is wrapped around the outside of the magnetic rod (320), and then the magnetic rod (320) is inserted into the rear end of the cylindrical water pipe (220); Step 4, inserting the porous chuck (500) into the clamping groove (211) of the "U"-shaped groove tube (210), multiple porous chucks (500) are provided, and the heights of the flushing holes (510) of the multiple porous chucks (500) are set at different levels; if a cylindrical water pipe (220) is selected, a group of porous chucks (500) are provided; Step 5, opening the water supply device (100), adjusting the water supply pressure of the water supply device (100), and causing water to flow out from the flushing holes (510) of the porous chuck (500) to flush the magnetic slurry (400); Step 6, using a high-definition digital camera to record the changing shape of the magnetic slurry (400) and the residual amount of the magnetic slurry (400) after flushing, so as to study the spatial distribution of the viscosity of the magnetic slurry under the combined effects of different magnetic induction intensities or different water pressures or different air pressures; Step 7, replace the multi-hole chuck (500) with different opening positions and numbers, change a single variable, repeat Step 4 to Step 6, and conduct flushing test comparison.

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