Testing device for detecting fluctuation height of liquid level when neat paste is stirred

Abstract

The utility model relates to the field of concrete neat paste detection, and discloses a testing device for detecting the liquid level fluctuation height when neat paste is stirred, the testing device comprises a neat paste stirring barrel, a stirring device, an illuminating lamp group, a photoresistor array and a voltage detection circuit, the neat paste is arranged in the neat paste stirring barrel, the stirring device is used for stirring the neat paste, and the photoresistor array is used for detecting the liquid level fluctuation height of the neat paste. The stirring device is arranged on the cylinder wall to enable the liquid level of the neat paste to generate height fluctuation change, the photoresistor array comprises a plurality of photoresistors which are connected in series, the photoresistors are vertically and sequentially arranged from the top to the bottom of the cylinder wall, and the illuminating lamp set is used for illuminating the liquid level of the concrete mud mortar. In the net paste fluctuating process, the voltage in the photoresistor on the cylinder wall changes, the net paste liquid level fluctuating height can be calculated according to the voltage change, and the liquid level backflow time can be obtained by extracting information in a voltage change image obtained after stirring is finished.

Description

Technical Field

[0001] The utility model relates to the field of concrete paste detection, in particular to a testing device for detecting the height of liquid level fluctuation when the paste is stirred. Background Art

[0002] As an important indicator for evaluating clean pulp, the rheological properties of clean pulp play an important role in the various working performances of clean pulp.

[0003] As an important component of concrete, the rheology of cement paste and mortar determines the working performance of the corresponding concrete to a certain extent. Predicting the working performance of concrete, especially self-compacting concrete, by the rheology of cement paste or mortar is a hot research issue at present. In addition, small-scale cement paste or mortar tests can effectively save material costs and labor intensity. Therefore, in laboratories or actual projects, it is necessary to test the rheological parameters of cement paste or mortar.

[0004] The rheological properties of cement paste or mortar can be calculated with the help of parameters obtained from the expansion test of the paste, which is related to the expansion value and the time corresponding to the expansion value of the paste. At present, the expansion test of pure paste or mortar is generally carried out on a test bench with a glass plate. After the paste stops flowing, the final expansion value of the paste is detected with a ruler. The detection of the time from the expansion cylinder being lifted to the time when the paste expands to a certain value is more complicated, such as using numerical markings on the glass plate or using video playback readings for detection, and the above methods have the following shortcomings:

[0005] (1) The detection accuracy depends on whether the test bench is flat. It is difficult to level the test bench when the ground is uneven.

[0006] (2) It is difficult to ensure that the lifting speed of the expansion cylinder is uniform and meets the specified time requirements, which affects the test results;

[0007] (3) The glass plate used will reflect the light of the fluorescent lamp, affecting the observation and detection of the slurry image;

[0008] (4) The test data requires manual inspection or post-video processing and cannot be obtained immediately;

[0009] (5) The test equipment is not systematic and cannot be conveniently carried to other locations to perform testing tasks.

[0010] Therefore, the current detection of paste rheological parameters has the problems of complex detection, large errors, and untimely feedback of results, which limits the promotion and application of methods based on the rheological parameters of neat paste or mortar to predict the working performance of concrete. Summary of the invention

[0011] In view of the above problems, the utility model provides a detection device with simple structure, easy operation and timely result feedback. The specific scheme is as follows:

[0012] A testing device for detecting the height of the liquid level fluctuation when the pure slurry is stirred, comprising:

[0013] Pure slurry mixing bucket, used to hold the pure slurry to be tested;

[0014] A stirring device is arranged in the middle of the stirring barrel and is used to stir the pure slurry so that the liquid level of the pure slurry fluctuates in height;

[0015] A lighting lamp group is arranged on the top of the cylinder wall of the pure pulp mixing barrel, and includes a plurality of lighting lamps, which are arranged circumferentially along the top of the cylinder wall, and the lighting range of the plurality of lighting lamps covers the cylinder wall of the pure pulp mixing barrel below the plurality of lighting lamps;

[0016] A photoresistor array includes a plurality of photoresistors connected in series, wherein the plurality of photoresistors are arranged vertically in sequence from the top to the bottom of the tube wall;

[0017] The voltage detection circuit is arranged outside the pure pulp stirring barrel and is electrically connected to the photoresistor array for reading the voltage value of the photoresistor array.

[0018] Preferably, the pure slurry stirring barrel is made of an opaque material, the photoresistor array is arranged on the inner wall of the pure slurry stirring barrel, and a plurality of photoresistors are closely arranged.

[0019] Preferably, the plurality of photoresistors are fixed on a plate, and the plurality of photoresistors and the outside of the plate are wrapped with epoxy resin, and the epoxy resin is bonded and fixed to the inner wall of the pure slurry mixing barrel by adhesive.

[0020] Preferably, a glass plate layer is bonded to the outer surface of the epoxy resin covering the photoresistor to prevent wear.

[0021] Preferably, the slurry mixing barrel is a cylindrical structure, and the epoxy resin is located on one side of the plate body and has a convex arc surface that adapts to the concave arc surface of the inner wall of the slurry mixing barrel.

[0022] Preferably, the stirring device includes a motor, the output shaft of the motor is arranged vertically downward and aligned with the axial direction of the pure slurry stirring barrel, and a stirring blade is installed at the end of the output shaft. The stirring blade is a plate-like structure, and a comb-like structure is provided on the stirring blade for the lighting lamp to penetrate.

[0023] Preferably, the voltage detection circuit comprises a power supply, a protection resistor and a power switch connected in series with two ends of the photoresistor array, wherein a voltmeter is connected in parallel at two ends of the photoresistor array.

[0024] Preferably, the number of the photoresistors is proportional to the measurement accuracy of the liquid level fluctuation.

[0025] Compared with the prior art, the advantages of the utility model are as follows:

[0026] 1. The utility model irradiates the clean slurry with a lighting system, and then makes the clean slurry fluctuate through a stirring device. During the fluctuation of the clean slurry, the voltage in the photoresistor on the cylinder wall changes, and the fluctuation height of the clean slurry liquid level can be calculated by the change in voltage. The liquid level reflux time can be obtained by extracting information from the voltage change image obtained after the stirring is completed.

[0027] 2. The utility model improves the measurement accuracy of the fluctuation height of the net slurry surface by increasing the density of the photoresistors in the photoresistor array.

[0028] 3. The utility model wraps the photoresistor array with epoxy resin, which has the function of protecting the photoresistor array and avoiding short circuit;

[0029] The utility model can avoid the wear of epoxy resin when the clean slurry is stirred by arranging a glass plate layer on one side of the epoxy resin located at the photoresistor array.

[0030] 5. The utility model limits the pure slurry mixing barrel to be made of an opaque material, and the photoresistor array is arranged on the inner wall of the pure slurry mixing barrel, so as to avoid the influence of light in the external environment on the resistance change of the photoresistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural diagram of the testing device of the utility model;

[0032] Figure 2 It is a structural diagram of the photoresistor array of the utility model;

[0033] Figure 3 is the circuit diagram of the voltage detection circuit;

[0034] Figure 4 is the voltage variation curve in the test;

[0035] Figure 5 It is the relationship curve between the net slurry surface fluctuation and voltage change;

[0036] Reference numerals:

[0037] 1. Pure slurry mixing barrel; 2. Pure slurry; 3. Lighting lamp; 4. Photoresistor; 5. Epoxy resin; 7. Voltmeter; 8. Power supply; 9. Power switch; 10. Protection resistor; 11. Mixing blade; 12. Output shaft of motor. DETAILED DESCRIPTION

[0038] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "front", "rear", etc. indicating directions or positional relationships are only for describing the present invention and simplifying the description, and do not indicate or imply that the device or structure referred to must have a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] Example 1

[0040] like Figure 1 As shown, a testing device for detecting the height of the liquid level fluctuation when the pure slurry is stirred,

[0041] Pure slurry mixing bucket, used to hold the pure slurry to be tested;

[0042] A stirring device is arranged in the middle of the stirring barrel and is used to stir the pure slurry so that the liquid level of the pure slurry fluctuates in height; the stirring device comprises a motor, the output shaft of the motor is arranged vertically downward and aligned with the axial direction of the pure slurry stirring barrel, and a stirring blade is installed at the end of the output shaft;

[0043] A lighting lamp group is arranged on the top of the cylinder wall of the pure pulp mixing barrel, and includes a plurality of lighting lamps, which are arranged circumferentially along the top of the cylinder wall, and the lighting range of the plurality of lighting lamps covers the cylinder wall of the pure pulp mixing barrel below the plurality of lighting lamps;

[0044] The stirring blade is a plate-like structure, and a comb-like structure is provided on the stirring blade for the light of the lighting lamp to penetrate;

[0045] A photoresistor array includes a plurality of photoresistors connected in series, wherein the plurality of photoresistors are arranged vertically in sequence from the top to the bottom of the tube wall;

[0046] A voltage detection circuit is arranged outside the pure pulp stirring barrel and is electrically connected to the photoresistor array for reading the voltage value of the photoresistor array. The voltage detection circuit includes a power supply, a protection resistor and a power switch connected in series with both ends of the photoresistor array, wherein a voltmeter is connected in parallel at both ends of the photoresistor array. The number of the photoresistors is proportional to the measurement accuracy of the liquid level fluctuation.

[0047] Example 2

[0048] The utility model initially sets the material of the pure slurry mixing barrel to be transparent, and the photoresistor array can be directly installed on the outer wall of the pure slurry mixing barrel. However, due to the external ambient light irradiating on the photoresistor, the resistance value of the photoresistor changes and an error occurs. In order to solve this problem, the utility model further limits the structure of the pure slurry mixing barrel and the photoresistor array. The scheme is as follows:

[0049] The slurry mixing barrel is made of opaque material, the photoresistor array is arranged on the inner wall of the slurry mixing barrel, and multiple photoresistors are closely arranged; multiple photoresistors are fixed on a plate body, and the outside of the multiple photoresistors and the plate body are wrapped with epoxy resin, and the epoxy resin is bonded and fixed to the inner wall of the slurry mixing barrel by adhesive; the outer surface of the epoxy resin covering the photoresistor is adhered with a layer of glass plate layer for preventing wear.

[0050] Example 3

[0051] In order to make the liquid level of the clean slurry rise and fall smoothly when being stirred, the utility model further limits the structure of the clean slurry stirring barrel. The clean slurry stirring barrel is a cylindrical structure, and the epoxy resin is located on one side of the plate body and has a convex arc surface that adapts to the concave arc surface of the inner wall of the clean slurry stirring barrel.

[0052] Example 4

[0053] The utility model can obtain the voltage change of the photoresistor through the above-mentioned testing device, and can obtain the fluctuation height of the clean slurry surface through the voltage change. The specific scheme is as follows:

[0054] 1. Use a ruler to measure the height value h of a single photoresistor

[0055] 2. Clean up the debris in the pure slurry mixing barrel and turn on the stirring device. Adjust the lighting group to illuminate the pure slurry mixing barrel and the stirring blades until the voltage in the voltage detection circuit is stable. This completes the debugging of this experimental device.

[0056] 3. Turn on the power switch in the lighting unit and the voltage detection circuit, put the clean slurry into the clean slurry mixing bucket, and record the voltage value V0 of the clean slurry when it is not stirred;

[0057] 4. Turn on the stirring blade to start automatic stirring. The stirring device rotates constantly. The liquid level of the pure slurry is at the highest point of fluctuation on the cylinder wall. Measure the voltage value V1 when the pure slurry is in stable stirring;

[0058] 5. Now substitute V0 and V1 into the relationship between voltage and the resistance x not exposed to light to find x0 and x1:

[0059]

[0060] Among them, U is the voltage value, I is the current value, n is the number of photoresistors, R L The minimum resistance value of each photoresistor, R H is the maximum resistance value of each photoresistor;

[0061] Calculate the product H0 of x0 and the height h of a single resistor and the product H1 of x1 and the height h of a single resistor respectively, and use H1-H0 to obtain the maximum degree H of the liquid level fluctuation.

[0062] 5. After the stirring is completed, the information in the obtained voltage change image is extracted to obtain the liquid surface reflux time after the stirring is completed;

[0063] The significance of the above experimental data:

[0064] a. In terms of the fluidity of the pure pulp, the commonly used pure pulp expansion test often uses T 200 (refers to the time when the net slurry expands to the 200mm line in the expansion experiment) to describe. In the scheme of the utility model, after multiple tests, it can be clearly observed that the reflow time ΔT after stopping is different from T 200 There is an obvious positive correlation, that is, there is a functional relationship between the two:

[0065] T 200 =f(ΔT);

[0066] b. The same rule also exists between the expansion degree SF in the pure slurry expansion degree experiment (referring to the maximum area of ​​the pure slurry expanded on the plane in the expansion degree experiment) and the maximum height H in the solution of the utility model. Considering that the volume of pure slurry stirred each time is different, it will affect the position of the maximum height. Therefore, in the analysis of pure slurry of different volumes, we adopt the ratio of the maximum height H to the horizontal liquid level H0 after stopping, that is, After a large number of experiments, it was also observed that SF and There is an obvious functional relationship between

[0067]

[0068] c. Through many previous tests, we can and T 200 -ΔT fitting function, the final test results can be compared with the fitting curve to get the actual T 200 and SF.

[0069] In order to make the purpose, technical solution and advantages of the utility model more concise and clear, the utility model is illustrated by the above specific embodiments, which are only used to describe the utility model and cannot be understood as limiting the scope of the utility model. It should be pointed out that any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A testing device for detecting the height of the liquid level when the pure slurry is stirred, characterized in that: include: Pure slurry mixing bucket, used to hold the pure slurry to be tested; A stirring device is arranged in the middle of the stirring barrel and is used to stir the pure slurry so that the liquid level of the pure slurry fluctuates in height; A lighting lamp group is arranged on the top of the cylinder wall of the pure pulp mixing barrel, and includes a plurality of lighting lamps, which are arranged circumferentially along the top of the cylinder wall, and the lighting range of the plurality of lighting lamps covers the cylinder wall of the pure pulp mixing barrel below the plurality of lighting lamps; A photoresistor array includes a plurality of photoresistors connected in series, wherein the plurality of photoresistors are arranged vertically in sequence from the top to the bottom of the tube wall; The voltage detection circuit is arranged outside the pure pulp stirring barrel and is electrically connected to the photoresistor array for reading the voltage value of the photoresistor array.

2. The testing device for detecting the height of the liquid level when the pure slurry is stirred according to claim 1, characterized in that: The pure slurry stirring barrel is made of an opaque material, and the photoresistor array is arranged on the inner wall of the pure slurry stirring barrel, and a plurality of photoresistors are closely arranged.

3. The testing device for detecting the height of the liquid level when the pure slurry is stirred according to claim 2, characterized in that: The plurality of photoresistors are all fixed on a plate body, and the plurality of photoresistors and the outside of the plate body are wrapped with epoxy resin, and the epoxy resin is bonded and fixed to the inner wall of the pure slurry mixing barrel through adhesive.

4. The testing device for detecting the height of the liquid level fluctuation when the pure slurry is stirred according to claim 3, characterized in that: The outer surface of the epoxy covering the photoresistor is bonded with a glass plate layer for protection from wear.

5. The testing device for detecting the height of the liquid level fluctuation when the pure slurry is stirred according to claim 4, characterized in that: The pure slurry mixing barrel is of a cylindrical structure, and the epoxy resin is located on one side of the plate body and has a convex arc surface adapted to the concave arc surface of the inner wall of the pure slurry mixing barrel.

6. The testing device for detecting the height of the liquid level when the pure slurry is stirred according to claim 1, characterized in that: The stirring device comprises a motor, the output shaft of the motor is arranged vertically downward and aligned with the axial direction of the pure slurry stirring barrel, a stirring blade is installed at the end of the output shaft, the stirring blade is a plate-like structure, and a comb-like structure is provided on the stirring blade for the illumination light to penetrate.

7. The testing device for detecting the height of the liquid level when the pure slurry is stirred according to claim 1, characterized in that: The voltage detection circuit comprises a power supply, a protection resistor and a power switch connected in series with two ends of the photoresistor array, wherein a voltmeter is connected in parallel at two ends of the photoresistor array.

8. The testing device for detecting the height of the liquid level when the pure slurry is stirred according to claim 7, characterized in that: The number of the photoresistors is proportional to the measurement accuracy of the liquid level fluctuation.

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