Calibration device and calibration method for building material moisture meter

Abstract

The invention discloses a building material moisture meter calibration device and calibration method, and belongs to the technical field of building material instrument metering. The calibration device comprises a building material constant humidity box which is a box body with an upper opening and is provided with a sealing box cover, purified water is contained in the lower portion of the box body, a stainless steel net frame is arranged in the middle of the box body to separate water from a standard sample block, a rotatable mechanical gripper is arranged above the box body, one face of the sample block is automatically turned over every 4-12 hours, and it is ensured that the water is evenly absorbed. A water inlet is formed in the side face of the box body, and a drain valve is arranged at the bottom of the box body. The calibration method comprises the following steps: carrying out constant humidity treatment on a standard sample block for 2-5 days, measuring multi-surface moisture values by using a moisture tester, averaging, drying, cooling, weighing, calculating the actual moisture content, and finally obtaining an instrument indication error. According to the invention, rapid and accurate calibration of the building material moisture meter can be realized, the measurement blank in the field is filled, and the measurement consistency and reliability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building material instrument metrology, in particular to a building material moisture tester calibration device and method. BACKGROUND

[0002] The determination of the moisture content of building materials is of great significance. The water content of building materials directly affects the overall quality and safety of construction projects. For example, too high or too low water content in materials such as cement and concrete can affect the setting and hardening process, thereby affecting the strength and stability of the building structure. Through moisture determination, construction personnel can understand the actual state of the building materials, and accordingly adjust the construction plan and process parameters to ensure the smooth progress of the construction process and achieve the expected engineering effect. As can be seen, the determination of the moisture content of building materials is not only a basic requirement for ensuring the quality of the project, but also an important means of improving construction efficiency, saving costs and promoting the progress of the industry. Therefore, in construction projects, strict moisture detection should be carried out on building materials to ensure that all indicators meet the standard requirements.

[0003] The main methods for measuring the moisture content of building materials are drying, electrical measurement, dry distillation, titration, and microwave induction. The common instrument is the microwave induction method. There is currently no calibration method or device for the instrument. Therefore, there is an urgent need to develop a calibration device and method that can be applied to various building material moisture testers. SUMMARY

[0004] The present application provides a building material moisture tester calibration device and method to overcome the shortcomings of the prior art and achieve convenient, fast and accurate measurement of building material moisture testers.

[0005] A building material moisture tester calibration device, comprising a building material constant humidity box, characterized in that: The building material constant humidity box is an open-top box body with a rubber ring sealed lid. The box body is divided into upper and lower parts. The lower part is used to hold pure water and has water level markings at the water level window to ensure constant water level. A stainless steel grid is provided in the middle to separate the pure water from the building material standard sample block. The standard sample block is a rectangular or cubic block with dimensions of (6-10) cm, with the shortest side not less than 6 cm, and is made of cement blocks, marble, bricks and other building materials. A mechanical gripper is provided above the stainless steel grid. The mechanical gripper is used to hold the building material standard sample block and can be rotated. It is configured to turn the standard sample block every 4-12 hours. The side of the building material constant humidity box is provided with a water inlet, and the lower end is provided with a drain valve.

[0006] Further, in order to better realize the present application, a magnetic stirring rod is arranged in the lower half of the building material constant humidity box, and a magnetic stirring device is arranged at the bottom of the box body, for slightly stirring the pure water in the box.

[0007] Further, in order to better realize the present application, a temperature and humidity meter is arranged on the box cover.

[0008] Further, in order to better realize the present application, the building material moisture tester calibration device further comprises an electronic balance, an oven and a drying box.

[0009] A building material moisture tester calibration method, comprising the following steps: S1, the stirring function and the mechanical hand overturning function of the building material constant humidity box are turned on, the building material standard sample block is placed in the constant humidity box for at least 2-5 days, and the building material standard sample block can be placed in the constant humidity box at all times, and the temperature and humidity of the constant humidity box are monitored, and there should be no large change; S2, the building material standard sample block after humidity is taken out, the moisture value of the building material standard sample block on six surfaces is quickly measured by the building material moisture tester, the center position of each surface is measured, and a total of six data are obtained , and the average value is recorded as the instrument indication ; S3, the mass of the building material standard sample block is quickly weighed by the electronic balance, and is recorded as m0; S4, the oven is set to a temperature of 105 DEG C, and the building material standard sample block is placed in the oven for drying for 8-24h; S5, the building material standard sample block is taken out from the oven and quickly placed in the drying box, at this time, the building material standard sample block continuously releases heat, the temperature of the drying box is increased, after the temperature of the drying box is restored to room temperature, the building material standard sample block is taken out, and the mass of the building material standard sample block is quickly weighed by the electronic balance, and is recorded as m1; S6, the water content of the building material standard sample block is calculated through a calculation formula, ; S7, the indication error of the instrument is calculated through a formula: ; S8, after calibration is completed, the building material standard sample block is placed in the constant humidity box, and the above steps are performed next time.

[0010] Further, in order to better realize the present application, the mechanical gripper in S1 is configured to overturn the building material standard sample block one surface every 4-12 hours, and the stirring intensity of the magnetic stirring device is controlled to be slightly flowing and without water flower or large vortex.

[0011] The present application has the following beneficial effects: The building material moisture tester calibration device can make the building material uniformly absorb water vapor, make the building material moisture value uniformly distribute, avoid the situation that the moisture content of the face below the building material is high in the traditional constant humidity method, and guarantee the measurement accuracy. The magnetic stirring accelerates the water flow, increases the water and air contact surface, and improves the water level line to guarantee the stability of the constant humidity box water vapor. The stirring speed and water amount can be adjusted to adjust the building material standard sample block with different moisture contents. In addition, the calibration method of the building material moisture tester is first proposed, and the measurement blank is filled. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The figure is a structural schematic diagram of the building material constant humidity box of the present application. Figure 2 The figure is a data statistical table of the first embodiment of the present application. Figure 3 The figure is a data statistical table of the second embodiment of the present application.

[0013] In the figure, 1, building material constant humidity box, 2, box cover, 3, water level window hole, 4, stainless steel net rack, 5, mechanical gripper, 6, water inlet, 7, drain valve, 8, magnetic stirring rod, 9, magnetic stirring device. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0016] Figure 1The constant humidity box for building materials of the present application is made of glass or plastic, and has an upper opening. The box cover 2 is sealed with a rubber ring. The box is divided into upper and lower parts. The lower part contains pure water, and the water level window 3 is marked with water level lines. The water level should be kept constant. The middle part is separated by a stainless steel mesh frame 4, which separates the pure water and the building material sample block to prevent it from falling into the water. The building material sample block is fixed by a conventional multi-degree-of-freedom mechanical gripper 5, which can rotate and turn over one face every 4-12 hours. The box has a water inlet 6 on the side and a drain valve 7 at the lower end. The lower half of the constant humidity box only contains pure water, and a magnetic stirrer 8 (length 50-100 cm) is built-in. The box has a magnetic stirring device 9 at the bottom. After starting the stirring, the pure water in the box is slightly stirred without splashing or large vortex. A temperature and humidity meter is installed on the box cover. Different water content of the building material standard sample block can be adjusted by adjusting the stirring speed and water amount.

[0017] Example 1 1. Turn on the stirring function and mechanical hand turning function of the constant humidity box, and place the building material standard sample block, No. 1 block, in the constant humidity box for 2 days. Monitor the temperature and humidity of the constant humidity box, and there should be no large changes.

[0018] 2. Take out the No. 1 block after constant humidity, and use the building material moisture meter to quickly measure the moisture value of the six faces of the No. 1 block, at the center of each face. A total of 6 data, 6.0%, 6.0%, 7.0%, 6.0%, 7.0%, and 6.0%, are obtained. Take the average value as the instrument indication 6.3%.

[0019] 3. Quickly weigh the mass of the building material standard sample block using an electronic balance, and record it as m0: 613.60 g.

[0020] 4. Set the temperature of the oven to 105℃, and place the building material standard sample block in the oven for drying for 8h.

[0021] 5. Take out the building material standard sample block from the oven, and quickly place it in the drying box. At this time, the building material standard sample block will continue to release heat, causing the temperature of the drying box to rise. After waiting for the temperature of the drying box to return to room temperature, take out the building material standard sample block, and quickly weigh its mass using an electronic balance, and record it as m1: 583.54 g.

[0022] 6. Calculate the moisture content of the building material standard sample block by the formula .

[0023] 7. Calculate the indication error of the instrument by the formula .

[0024] The data statistics are shown in Figure 2 .

[0025] Example 2 1. Turn on the stirring function and mechanical hand overturning function of the constant humidity box, and place the building material standard sample block, block 2, in the constant humidity box for 2 days. Monitor the temperature and humidity of the constant humidity box, and there should be no large changes.

[0026] 2. Take out the constant humidity block 2, and use the building material moisture tester to quickly measure the moisture value of the six faces of the block 2, and measure the center position of each face. A total of 6 data, respectively 2.0%, 2.0%, 2.0%, 2.0%, 2.0%, 2.0%. Take the average value as the instrument value 2.3%.

[0027] 3. Quickly weigh the mass of the building material standard sample block with an electronic balance, and record it as m0: 563.92g.

[0028] 4. Set the temperature of the oven to 105℃, and place the building material standard sample block in the oven to dry for 8h.

[0029] 5. Take out the building material standard sample block from the oven, and quickly place it in the drying box. At this time, the building material standard sample block will continue to release heat, causing the temperature of the drying box to rise. After waiting for the temperature of the drying box to return to room temperature, take out the building material standard sample block, and quickly weigh the mass of the building material standard sample block with an electronic balance, and record it as m1: 550.56g.

[0030] 6. Calculate the moisture content of the building material standard sample block by the formula .

[0031] 7. Calculate the instrument value error by the formula The data statistics are shown in Figure 3 .

[0032] Finally, it should be pointed out that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Other modifications or equivalent replacements to the technical solutions of the present application made by those of ordinary skill in the art should be covered within the scope of the claims of the present application, as long as they do not deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A calibration device for a building material moisture meter, comprising a building material constant humidity chamber (1), characterized in that: The building material constant humidity chamber (1) is an upper-opening chamber and is equipped with a chamber cover (2) sealed with a rubber ring. The chamber is divided into an upper and a lower part. The lower part is used to hold pure water and is provided with a water level mark at a water level window (3) to ensure a constant water level. A stainless steel grid (4) is provided in the middle part to separate the pure water from the building material standard sample blocks. The standard sample blocks of building materials are rectangular parallelepiped or cubes with a size of 6 to 10 cm, with the shortest side not less than 6 cm, and are made of cement blocks, marble, or brick building materials; A mechanical gripper (5) is provided above the stainless steel grid (4), and the mechanical gripper (5) is used to clamp the standard sample block of building materials and is rotatable, and is configured to flip one side of the standard sample block every 4 to 12 hours; The building material constant humidity box (1) is provided with a water inlet (6) on the side and a drain valve (7) at the lower end.

2. The calibration device for a building material moisture meter according to claim 1, characterized in that: The lower half of the building material constant humidity chamber (1) is provided with a built-in magnetic stirring rod (8), and a magnetic stirring device (9) is provided at the bottom of the chamber for slightly stirring the pure water in the chamber.

3. The calibration device for a building material moisture meter according to claim 1, characterized in that: A temperature and humidity gauge is provided on the box cover (2).

4. The calibration device for a building material moisture meter according to claim 1, characterized in that: The building material moisture meter calibration device also includes an electronic balance, an oven and a drying box.

5. A method for calibrating a building material moisture meter, based on the calibration device for a building material moisture meter according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, turn on the stirring function and the turning function of the manipulator of the constant humidity chamber (1) of building materials, place the standard sample of building materials in the constant humidity chamber for at least 2 to 5 days, and keep it in the constant humidity chamber at all times. Pay attention to monitor the temperature and humidity of the constant humidity chamber, and do not allow it to change significantly; S2, take out the building material standard sample after constant humidity, and use the building material moisture meter to quickly measure the moisture value of the six sides of the building material standard sample. Measure the center position of each side, a total of 6 data , take the average value and record it as the instrument indication ; S3, use an electronic balance to quickly weigh the mass of the standard sample of building materials, recorded as m0; S4, set the oven temperature to 105°C, place the standard building material sample in the oven and dry it for 8 to 24 hours; S5, take out the standard building material sample from the oven and quickly place it in a drying oven. At this time, the standard building material sample will continue to release heat, causing the temperature of the drying oven to rise. After the temperature of the drying oven returns to room temperature, take out the standard building material sample and quickly weigh the mass of the standard building material sample using an electronic balance, which is recorded as m1; S6, calculate the moisture content of the standard sample of building materials through the calculation formula, ; S7, calculate the indication error of the instrument using the formula: ; S8. After calibration is completed, place the building material standard sample block in a constant humidity chamber and repeat the above steps for the next calibration.

6. The method for calibrating a building material moisture meter according to claim 5, wherein: The mechanical gripper (5) in S1 is configured to flip one side of the building material standard sample block every 4 to 12 hours, and the stirring intensity of the magnetic stirring device (9) is controlled to cause the water to flow slightly without splashes or large vortices.

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