Device for measuring rheological parameters of cement paste

Abstract

The utility model discloses a device for measuring rheological parameters of cement paste. A threaded through hole is formed in the bottom of a stirring pot and hermetically connected with the upper end of a fluid switch, the lower end of the fluid switch is hermetically connected with the upper end of a guide pipe, the lower end of the guide pipe is connected with a truncated cone round mold, and the truncated cone round mold is fixedly mounted on a transparent plate; the plurality of photoelectric sensors are mounted around the truncated cone round mold and are divided into two groups, one group of photoelectric sensors are used for detecting optical signals when neat paste starts to flow in the truncated cone round mold, and the other group of photoelectric sensors are used for detecting optical signals when the expansion degree reaches a preset distance on the transparent plate; and the integrated timer and the photoelectric sensor are electrically connected with the microcontroller. According to the device, the fluid switch is directly turned on after cement paste is stirred, the cement paste flows into the truncated cone round mold along the guide pipe, the reaction speed is high, the cement paste does not need to be manually poured into the truncated cone round mold, the bottom sinking phenomenon is avoided, errors caused by manual metering are eliminated, and the testing accuracy is improved.

Description

Technical Field

[0001] The utility model relates to a device for measuring rheological parameters of cement paste, belonging to the technical field of rheological parameter measurement and counting of cement paste. Background Art

[0002] Measuring the fluidity of the paste (or pure paste) is a crucial technology in the field of civil engineering, especially in concrete engineering. The fluidity of the paste directly affects the plasticity, workability, and ultimate strength and durability of concrete. Therefore, accurate measurement of the fluidity of the paste is essential to ensure the quality and durability of concrete structures.

[0003] The truncated cone mold is widely used in the field of civil engineering to test the fluidity of the paste. The mold adopts a simple but effective design. It is usually made of metal and its shape is similar to an inverted cone with a flat top and a cylindrical base connected to the bottom. In the test, concrete or other paste is filled into the truncated cone mold and allowed to flow and expand. By measuring the diameter of the paste flowing out of the mold and the time it takes to flow out, the fluidity indicators such as the yield strength and bond strength of the paste can be calculated.

[0004] The truncated cone mold has several significant advantages that make it one of the preferred tools for flow testing. First, its simple design makes it easy to manufacture and operate, making the test process relatively quick and low-cost. Second, the truncated cone mold can provide reliable test results and has high applicability for various types of pastes, including various concretes, cement pastes, and other construction materials. In addition, due to the standardization of its shape and operation method, the results of tests using the truncated cone mold are highly comparable and repeatable, which helps to ensure the consistency of results obtained in different laboratories or under different test conditions.

[0005] However, some errors may occur due to human factors when testing the flow properties of the pure pulp, mainly including the following aspects:

[0006] (1) In traditional tests, cement paste is poured into a truncated cone mold after mixing. However, the paste often sinks to the bottom after mixing, which causes a certain degree of error in the test of the fluidity of the paste.

[0007] (2) After stirring and loading, the truncated cone mold needs to be lifted to test the fluidity. Lifting the mold by hand will cause it to deviate from the origin of the glass plate, resulting in inaccurate readings and causing certain errors in the measurement.

[0008] (3) Among the slurry flow parameters, T 200 It plays an important role in evaluating the bonding properties of the paste. 200It indicates the time taken for the pure slurry to flow to 200mm. In traditional experiments, it is usually observed with the naked eye and timed with a stopwatch, which often cannot accurately record the time and cannot describe the entire process of pure slurry flow. Utility Model Content

[0009] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a device for measuring the rheological parameters of cement slurry. After the cement slurry is stirred, the device directly turns on the fluid switch, and the slurry flows into the truncated cone mold along the conduit. The reaction speed is fast, and there is no need to manually pour it into the truncated cone mold, which avoids the phenomenon of sinking to the bottom, eliminates the error caused by manual measurement, and improves the test accuracy. After the stirring and loading are completed, the device lifts the truncated cone mold by moving the retractable steel plate and the fixed pulley along the angle steel column in the up and down direction, avoiding the deviation of the glass plate origin and causing inaccurate readings, which causes certain errors in the measurement and ensures that the glass plate origin will not deviate.

[0010] In the first aspect, the utility model provides a device for measuring rheological parameters of cement slurry, including a stirring pot, a fluid switch, a conduit, a transparent plate, a truncated cone mold, an integrated timer, a plurality of photoelectric sensors and a microcontroller. A threaded through hole is provided at the bottom of the stirring pot, the threaded through hole is sealed and connected to the upper end of the fluid switch, the lower end of the fluid switch is sealed and connected to the upper end of the conduit, the lower end of the conduit is connected to the truncated cone mold, and the truncated cone mold is fixedly mounted on the transparent plate; a plurality of photoelectric sensors are installed around the truncated cone mold, and the plurality of photoelectric sensors are divided into two groups, one group of photoelectric sensors is used to detect an optical signal indicating that the slurry starts to flow in the truncated cone mold, and the other group of photoelectric sensors is used to detect an optical signal indicating that the expansion degree reaches a preset distance on the transparent plate, and the integrated timer and the photoelectric sensors are electrically connected to the microcontroller.

[0011] Preferably, it includes several fixed pulleys, several angle steel columns for guiding the fixed pulley to slide up and down, and several retractable steel plates for fixing the truncated cone circular mold. The several angle steel columns are fixedly arranged around the transparent plate, the rotating shafts of the several fixed pulleys are slidably connected to the several angle steel columns, and the several retractable steel plates are fixedly connected to the several fixed pulleys.

[0012] Preferably, pulley teeth matching the fixed pulley are provided at both ends of the telescopic steel plate, and the pulley teeth are engaged and fixedly connected to the fixed pulley.

[0013] Preferably, it includes a truncated cone mold fixture and a high-strength magnet, the retractable steel plate is connected to the truncated cone mold through the truncated cone mold fixture, and high-strength magnets are respectively installed at both ends of the truncated cone mold to ensure that the truncated cone mold fixture is tightly connected to the retractable steel plate.

[0014] Preferably, it comprises a bottom plate and a top plate, the upper ends of a plurality of angle steel columns are fixedly connected to the top plate, the lower ends of a plurality of angle steel columns are fixedly connected to the bottom plate, the stirring pot is fixedly mounted on the top plate, and the transparent plate is fixedly mounted on the bottom plate.

[0015] Preferably, it comprises a cement mortar mixer, which is fixedly arranged on the top plate and located above the mixing pot.

[0016] Preferably, the fluid switch comprises a threaded ball valve.

[0017] Beneficial effects achieved by the utility model:

[0018] In this device, when the slurry just starts to flow, the CMOS laser sensor captures the slurry flow and the microcontroller starts the timer; the CMOS laser sensor captures the signal of the slurry flowing through the 200mm circular edge and the integrated timer stops timing. The integrated timer records the time taken for the net slurry to flow to 200mm, reducing the error caused by manual timing.

[0019] In this device, the truncated cone circular mold is clamped by a retractable steel plate and an end clamp to ensure that the truncated cone circular mold clamps at both ends are tightly connected to the retractable steel plate. The two ends of the retractable steel plate are connected to a fixed pulley, which is welded inside the angle steel column. The truncated cone circular mold is placed in the middle of the glass plate, and the glass plate is marked with a scale for easy reading. The two ends of the retractable steel plate are connected to the fixed pulley, which ensures that the retractable steel plate can move up and down, ensuring the movement of the truncated cone circular mold in the vertical direction. The rotating shafts at both ends of the fixed pulley are rigidly connected to the angle steel column.

[0020] The device directly turns on the fluid switch after the cement slurry is stirred, and the slurry flows into the truncated cone mold along the conduit. The reaction speed is fast, and there is no need to pour it into the truncated cone mold manually, which avoids sinking to the bottom and eliminates the error caused by manual measurement, thereby improving the test accuracy.

[0021] After completing stirring and loading, the device lifts the truncated cone circular mold by moving the retractable steel plate and the fixed pulley up and down along the angle steel column, avoiding the situation where the truncated cone circular mold deviates from the origin of the glass plate and causes inaccurate readings, which causes certain errors in measurement, and ensures that the origin of the glass plate will not deviate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 It is the overall schematic diagram of the device of the utility model;

[0024] Figure 2 It is a schematic diagram of the pulley device in the utility model;

[0025] Figure 3 It is a schematic diagram of the retractable steel plate in the utility model;

[0026] Figure 4 It is a schematic diagram of a glass plate and a truncated cone circular mold in the utility model;

[0027] Meaning of the numbers in the figure: 1-cement mortar mixer; 2-mixing pot; 3-threaded ball valve; 4-conduit; 5-fixed pulley; 6-transparent plate; 7-angle steel column; 8-retractable steel plate; 9-truncated cone mold; 10-integrated timer; 11-wire; 12-photoelectric sensor; 13-bottom plate; 14-top plate. DETAILED DESCRIPTION

[0028] To facilitate the technical solution of the application, some concepts involved in the application are first explained below.

[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention, they are only used to explain the relative position relationship and movement status of the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0030] See also Figure 1The present application discloses a device for measuring rheological parameters of cement slurry, including a stirring pot 2, a fluid switch, a conduit 4, a transparent plate 6, a truncated cone mold 9, an integrated timer 10, a plurality of photoelectric sensors 12 and a microcontroller. A threaded through hole is provided at the bottom of the stirring pot 2, the threaded through hole is sealed and connected to the upper end of the fluid switch, the lower end of the fluid switch is sealed and connected to the upper end of the conduit 4, the lower end of the conduit 4 is connected to the truncated cone mold 9, the truncated cone mold 9 is fixedly mounted on the transparent plate 6, and a stainless steel pipe is placed perpendicular to the truncated cone mold to ensure that the slurry in the stirring pot 2 falls vertically into the truncated cone mold 9 when it is poured; a plurality of photoelectric sensors 12 are installed around the truncated cone mold 9, and the plurality of photoelectric sensors 12 are divided into two groups, one group of photoelectric sensors 12 is used to detect an optical signal indicating that the slurry in the truncated cone mold 9 starts to flow, and the other group of photoelectric sensors 12 is used to detect an optical signal indicating that the expansion degree on the transparent plate 6 reaches a preset distance, and the integrated timer 10 and the photoelectric sensor 12 are electrically connected to the microcontroller. The transparent plate 6 can be a glass plate with a size of 400mm×400mm×6mm. The hole at the bottom of the stirring pot 2 is fixedly connected to the threaded ball valve 3. The lower part of the threaded ball valve 3 is threadedly connected to the stainless steel conduit 4. The diameter of the stainless steel conduit 4 is 30mm. The conduit 4 is placed vertically on the top of the truncated cone mold 9. The distance from the truncated cone mold 9 to the bottom of the conduit 4 is 20mm, ensuring that the poured clean slurry can flow into the truncated cone mold 9. The glass plate 6 is placed on the stainless steel bottom plate 13. The glass plate 6 is divided into sections every 2cm, and a circle is made with the center point of the glass plate 6 as the center and a diameter of 200mm. The truncated cone mold 9 is located in the middle of the glass plate 6. The glass plate 6 is engraved with detailed marking scales for easy reading. There is a significant circular mark on the glass plate 100mm away from the center point. At the truncated cone mold 9, when the slurry just begins to flow, the CMOS laser sensor captures the slurry flow and transmits it to the microcontroller through the input pin to start the timer. At the 200mm circle edge, the CMOS laser sensor captures the signal of the slurry flowing through the 200mm circle edge, and the controller stops the integrated timer 10. The integrated timer 10 records the time taken for the net slurry to flow to 200mm, reducing the error caused by manual timing.

[0031] In the embodiment of the present application, it includes a plurality of fixed pulleys 5, a plurality of angle steel columns 7 for guiding the fixed pulleys 5 to slide up and down, and a plurality of retractable steel plates 8 for fixing the truncated cone mold 9. The plurality of angle steel columns 7 are fixedly arranged around the transparent plate 6, the rotating shafts of the plurality of fixed pulleys 5 are slidably connected to the plurality of angle steel columns 7, and the plurality of retractable steel plates 8 are fixedly connected to the plurality of fixed pulleys 5. The angle steel column 7 can be a steel column with an L-shaped cross section, and the retractable steel plate 8 includes a plurality of U-shaped steel plates slidably connected in sequence. In the embodiment of the present application, it includes a truncated cone mold fixture and a high-strength magnet, the retractable steel plate 8 is connected to the truncated cone mold 9 through the truncated cone mold fixture, and high-strength magnets are respectively installed at both ends of the truncated cone mold 9 to ensure that the truncated cone mold fixture is tightly connected to the retractable steel plate 8. The truncated cone mold 9 is clamped by the retractable steel plate 8 and the end fixture to ensure that the truncated cone mold fixture and the retractable steel plate 8 at both ends are tightly connected. The two ends of the telescopic steel plate 8 are connected to the fixed pulley 5, and the fixed pulley is welded inside the angle steel column 7. The truncated cone circular mold 9 is placed in the middle of the glass plate 6, and the glass plate 6 is marked with scales for easy reading. The two ends of the telescopic steel plate 8 are connected to the fixed pulley 5, and the fixed pulley 5 ensures that the telescopic steel plate 8 can move up and down, ensuring the movement of the truncated cone circular mold 9 in the vertical direction. The rotating shafts at both ends of the fixed pulley 5 are rigidly connected to the angle steel column 7.

[0032] In the embodiment of the present application, pulley teeth matching the fixed pulley 5 are formed at both ends of the retractable steel plate 8. The pulley teeth are engaged and fixedly connected to the fixed pulley 5. The pulley teeth can be semicircular.

[0033] In the embodiment of the present application, a bottom plate 13 and a top plate 14 are included, the upper ends of a plurality of angle steel columns 7 are fixedly connected to the top plate 14, the lower ends of a plurality of angle steel columns 7 are fixedly connected to the bottom plate 13, the stirring pot 2 is fixedly mounted on the top plate 14, the transparent plate 6 is fixedly mounted on the bottom plate 13, and the bottom plate 13 and the top plate 14 can be stainless steel plates.

[0034] In the embodiment of the present application, a cement mortar mixer 1 is included, and the cement mortar mixer 1 is fixedly arranged on the top plate 14, and the cement mortar mixer 1 is located above the mixing pot 2. In the embodiment of the present application, the fluid switch includes a threaded ball valve 3.

[0035] The photoelectric sensor 12 adopts a CMOS laser sensor. The receiving head of the CMOS laser sensor is close to the surface of the glass plate 6. A total of eight CMOS laser sensors are placed, four of which are aimed at the truncated cone mold 9 to capture the optical signal of the start of the flow of the clean slurry. The laser beam of the CMOS laser sensor will be reflected or scattered when it hits the target surface. The reflected light beam will hit the slurry surface and reflect back to the CMOS laser sensor at the same angle. The receiver of the photosensitive element installed inside the CMOS laser sensor generates an optical signal, which is connected to the programmable timer through the output pin, and the timer starts timing. The other four CMOS laser sensors are placed on the glass plate 6 at a straight line distance of 100mm from the center of the truncated cone mold 9 to capture the optical signal when the expansion reaches 200mm. The output pin of the CMOS laser sensor is connected to the timer. When the optical signal at 200mm is detected, the timer stops timing, and the time reading is displayed on the timer. The CMOS laser sensor consists of an ultra-small sensor probe, a receiver of a photosensitive element, and a multi-functional amplifier. The probe has a wide range and can detect objects from 2mm to 1m, and can accurately record the time when the clean slurry flows to 200mm. The output pin of the CMOS laser sensor is connected to the integrated timer 10 to stop timing, and the time reading is displayed through a display on the integrated timer 10, and the integrated timer 10 has a microcontroller chip integrated therein.

[0036] There are many models of cement mortar mixer 1, truncated cone mold fixture, high-strength magnet, threaded ball valve 3, mixing pot 2, fluid switch, truncated cone mold 9, fixed pulley 5, integrated timer 10, several photoelectric sensors 12 and microcontroller that can be used in the prior art. Those skilled in the art can choose according to actual needs, and no examples are given in this embodiment.

[0037] The utility model also provides a method for using the device for measuring rheological parameters of a pure slurry, comprising the following steps:

[0038] 1) Level the device. Place the device on a flat surface and use a level ruler to check whether the device is level. If the device is not level, adjust it until it is level.

[0039] 2) Check the device. Check the various components of the device. First, check whether the stirring pot is connected to the threaded ball valve 3. Then check whether the threaded ball valve 3 is connected to the stainless steel conduit 4. Check whether the stainless steel conduit 4 is perpendicular to the top of the truncated cone mold 9. Check whether the retractable steel plate 8 is connected to the two ends of the truncated cone mold 9. Ensure that the truncated cone mold 9 does not move. Finally, check whether the CMOS laser sensor is aligned with the test point.

[0040] 3) Stirring and adding materials. Weigh the materials according to the proportion of the net slurry to be tested, put the weighed materials into the mixing pot, and stir the net slurry with the mixer 1 according to the specification of GBT8077-2000 "Test Method for Homogeneity of Concrete Admixtures". After the stirring is stopped, open the valve on the threaded ball valve 3 to allow the net slurry to flow into the truncated cone mold 9. When the height of the net slurry in the truncated cone mold 9 reaches the upper surface of the truncated cone mold 9, close the valve on the threaded ball valve 3. Then unscrew the stainless steel guide tube 4.

[0041] 4) Start measuring. Gradually lift the truncated cone mold 9 to make the pure slurry start to flow. After the pure slurry flows, observe the reading on the glass plate 6, obtain the reading on the glass plate 6 and the time reading on the integrated timer 10, and make relevant records.

[0042] 5) Clean the test piece. After the test is completed, wash each part with clean water and keep it clean. Then start the second measurement and repeat steps 1-4. The above parameters measured by this device can be used to calculate the rheological parameters.

[0043] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0044] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the utility model herein. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not invented by the present invention. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0045] The above specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above are only specific implementation methods of the present application and are not used to limit the protection scope of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present application should be included in the protection scope of the present application.

Claims

1. A device for measuring rheological parameters of cement paste, characterized in that: The invention comprises a stirring pot (2), a fluid switch, a conduit (4), a transparent plate (6), a truncated cone mold (9), an integrated timer (10), a plurality of photoelectric sensors (12) and a microcontroller. The stirring pot (2) has a threaded through hole at the bottom thereof, the threaded through hole is sealedly connected to the upper end of the fluid switch, the lower end of the fluid switch is sealedly connected to the upper end of the conduit (4), the lower end of the conduit (4) is connected to the truncated cone mold (9), and the truncated cone mold (9) is fixedly mounted on the transparent plate (6). The plurality of photoelectric sensors (12) are mounted around the truncated cone mold (9), the plurality of photoelectric sensors (12) are divided into two groups, one group of photoelectric sensors (12) is used to detect an optical signal indicating that the pure slurry in the truncated cone mold (9) starts to flow, and the other group of photoelectric sensors (12) is used to detect an optical signal indicating that the expansion degree on the transparent plate (6) reaches a preset distance. The integrated timer (10) and the photoelectric sensors (12) are electrically connected to the microcontroller.

2. A device for measuring rheological parameters of cement paste according to claim 1, characterized in that: The invention comprises a plurality of fixed pulleys (5), a plurality of angle steel columns (7) for guiding the fixed pulleys (5) to slide up and down, and a plurality of retractable steel plates (8) for fixing the truncated cone circular mold (9). The plurality of angle steel columns (7) are fixedly arranged around the transparent plate (6), the rotating shafts of the plurality of fixed pulleys (5) are slidably connected to the plurality of angle steel columns (7), and the plurality of retractable steel plates (8) are fixedly connected to the plurality of fixed pulleys (5).

3. A device for measuring rheological parameters of cement paste according to claim 2, characterized in that: The two ends of the telescopic steel plate (8) are provided with pulley teeth matching the fixed pulley (5), and the pulley teeth are engaged and fixedly connected to the fixed pulley (5).

4. A device for measuring rheological parameters of cement paste according to claim 2, characterized in that: It comprises a truncated cone mold fixture and a high-strength magnet. The retractable steel plate (8) is connected to the truncated cone mold (9) via the truncated cone mold fixture. High-strength magnets are respectively installed at both ends of the truncated cone mold (9) to ensure that the truncated cone mold fixture and the retractable steel plate (8) are tightly connected.

5. The device for measuring rheological parameters of cement paste according to claim 2, characterized in that: It comprises a bottom plate (13) and a top plate (14), the upper ends of a plurality of angle steel columns (7) are fixedly connected to the top plate (14), the lower ends of a plurality of angle steel columns (7) are fixedly connected to the bottom plate (13), the stirring pot (2) is fixedly mounted on the top plate (14), and the transparent plate (6) is fixedly mounted on the bottom plate (13).

6. A device for measuring rheological parameters of cement paste according to claim 5, characterized in that: The invention comprises a cement mortar mixer (1), wherein the cement mortar mixer (1) is fixedly arranged on a top plate (14), and the cement mortar mixer (1) is located above a mixing pot (2).

7. The device for measuring rheological parameters of cement paste according to claim 1, characterized in that: The fluid switch comprises a threaded ball valve (3).

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