CN107329432B - Full-automatic maximum moisture absorption water tester - Google Patents

Abstract

A full-automatic maximum moisture absorption water tester, belonging to civil engineering experimental instruments; the device realizes automatic adjustment of the environmental humidity and temperature of the soil sample by the mutual coordination of the circuit assembly, the motor, the ultrasonic atomizer, the compressor, the plurality of fans and the various plurality of sensors, avoids the complicated procedure of continuously supplementing saturated potassium sulfate solution required by the conventional test, and can regularly weigh the weight of the soil sample after water absorption by the miniature weighing force transducer; the device has novel, reasonable and simple structure, realizes automatic operation, is simple and convenient to operate, saves operators, has low labor intensity, high maximum moisture absorption water measurement precision and stable and reliable operation.

Description

Fully automatic maximum moisture absorption water meter

Technical field

The invention belongs to civil engineering experimental instruments and mainly relates to a maximum moisture absorption water measuring instrument.

Background technique

In civil construction design, the determination of the maximum hygroscopic water content of the soil is a technical basic work that must be completed. At present, the determination of the maximum moisture absorption of soil samples is mainly done through manual experiments. The soil samples are placed in a desiccator filled with saturated potassium sulfate solution. The mouth of the desiccator is covered with a layer of petroleum jelly and the lid is tightly closed. The weighing begins after three days. , then weigh it every 2 to 3 days until the weight is constant. After one week, change the saturated potassium sulfate solution every 2 to 3 days. The process has low operating efficiency, high labor intensity, complicated operation process, and waste of labor. At the same time, traditional dryers are easily affected by temperature changes, hindering the normal progress of the soil moisture absorption process. Significant temperature changes (such as temperature drops) can It causes the capillary condensation of water in the soil, which has a great impact on the measurement results.

Contents of the invention

The purpose of this invention is to design a fully automatic maximum moisture absorption water measuring instrument to solve the problems existing in the above-mentioned prior art, so as to achieve the purpose of simple and convenient operation, saving labor, reducing labor intensity, and ensuring the accuracy of measuring the maximum moisture absorption water of soil samples.

The purpose of the invention is achieved as follows: a motor is installed in the device casing, a platform is installed in the operating room, the platform and the motor are fixedly installed, a humidity sensor, a temperature sensor and several layers of ceramic orifice plates are installed on the platform. A number of micro weighing load cells are installed on the ceramic orifice plate. A compressor is installed in the device casing. The compressor is annularly connected to the condenser and evaporator. The evaporator is outside the device casing. The outside of the condenser is equipped with a fan II and perforated elastic insulation material, and below the condenser is equipped with a water collection tank, an automatic drain valve II, a water tank II and a water outlet, and is surrounded by perforated elastic insulation material and a shell. There is a connecting cavity in the device casing, an ultrasonic atomizer and an automatic drain valve I are installed in the connecting cavity, and an electric heating wire and a fan I are installed above the ultrasonic atomizer from bottom to top. , a water tank I is installed above the automatic drain valve I, a liquid level sensor is installed in the water tank I, and a control circuit assembly is installed on the device casing. The control circuit assembly is controlled by a single-chip microcomputer unit. , general I/O, liquid crystal display, buttons, drive module, conversion module, the liquid crystal display is connected to the single chip control unit through general I/O, the buttons are connected to the single chip control unit, ultrasonic atomizer, compressor, motor , electric fan I, electric fan II, and electric heating wire are connected to the single-chip microcomputer control unit through the drive module, and the micro weighing force sensor, liquid level sensor, humidity sensor, and temperature sensor are connected to the single-chip microcomputer control unit through the conversion module.

The invention has a novel, reasonable and simple structure, realizes fully automated operation, is simple and convenient to operate, saves operators, has low labor intensity, has high accuracy in measuring moisture absorption in soil samples, and operates stably and reliably.

Description of the drawings

Figure 1 is a schematic diagram of the overall structure of the fully automatic maximum moisture absorption water meter;

Figure 2 is a schematic structural diagram of the control circuit assembly;

Figure 3 Schematic diagram of the structure of the ceramic orifice plate and micro weighing load cell;

Part number description in the picture:

1. Device shell, 2. Button, 3. Water tank I, 4. Liquid level sensor, 5. Automatic drain valve I, 6. Ultrasonic atomizer, 7. Fan I, 8. Heating wire, 9. Motor, 10 , compressor, 11, water outlet, 12, water tank II, 13, automatic drain valve II, 14, evaporator, 15, condenser, 16, fan II, 17, elastic insulation material with holes, 18, temperature sensor, 19. Humidity sensor, 20. Ceramic orifice plate, 21. Miniature weighing force sensor, 22. Microcontroller control unit, 23. Conversion module, 24. Drive module, 25. General I/O, 26. Circuit assembly, 27 , Pillar, 28, LCD screen, 29, water collection tank, 30, connecting cavity, 31, operation room.

Detailed ways

The creative embodiments of the present invention will be described in detail below with reference to the accompanying drawings. A fully automatic maximum moisture absorption water measuring instrument, which is characterized in that: a motor (9) is installed in the instrument casing (1), a column (27) is installed in the operating room (31), and the column (27) and the motor (9) are fixed The platform column (27) is equipped with a humidity sensor (19), a temperature sensor (18) and several layers of ceramic perforated plates (20), and a number of micro weighing load cells are installed on the ceramic perforated plates (20). (21). A compressor (10) is installed in the device casing (1). The compressor (10) is annularly connected to the condenser (15) and the evaporator (14). The evaporator (14) ) Outside the device casing (1), the condenser (15) is equipped with a fan II (16) and a perforated elastic thermal insulation material (17), and a water collection tank (29) is provided below the condenser (15). , automatic drain valve II (13), water tank II (12) and water outlet (11), the operating room (31) is surrounded by porous elastic thermal insulation material (17) and the device shell (1). The housing (1) is provided with a communicating cavity (30), and an ultrasonic atomizer (6) and an automatic drain valve I (5) are installed in the communicating cavity (30). 6) The electric heating wire (8) and fan I (7) are installed in sequence from bottom to top. A water tank I (3) is installed above the automatic drain valve I (5). A water tank I (3) is installed in the water tank I (3). There is a liquid level sensor (4), and a control circuit assembly (26) is installed on the device housing (1). The control circuit assembly (26) is composed of a single-chip microcomputer control unit (22), a general I/O ( 25), a liquid crystal display (28), a button (2), a drive module (24), and a conversion module (23). The liquid crystal display (28) communicates with the microcontroller control unit (22) through a general I/O (25). ) is connected, the button (2) is connected with the microcontroller control unit (22), the ultrasonic atomizer (6), the compressor (10), the motor (9), the electric fan I (7), the electric fan II (16), the electric heating wire ( 8) The driver module (24) is connected to the microcontroller control unit (22), and the micro weighing force sensor (21), liquid level sensor (4), humidity sensor (19), and temperature sensor (18) are connected through the conversion module (23) ) is connected to the microcontroller control unit (22).

When using the test, place the aluminum box containing the soil sample on the micro weighing load cell (21) on the ceramic orifice plate (20), input the humidity and temperature required for the soil sample through the button (2), and input it into the microcontroller After controlling the unit (22), the liquid level sensor (4), humidity sensor (19) and temperature sensor (18) are started through the conversion module (23) according to a predetermined program. The signals fed back by the liquid level sensor (4), the humidity sensor (19) and the temperature sensor (18) will respectively transmit the liquid level of the water tank I (3) and the humidity in the operation room (31) through the circuit assembly (26). , the temperature conditions in the operating room (31) are reflected on the LCD screen (28). If the water level is insufficient, add water to water tank I (2). The automatic drain valve I (5) can automatically control the amount of water entering the communicating chamber (30) from the water tank I (3) and keep the water level in the communicating chamber (30) constant. If the humidity in the operating room (31) is lower than the preset value, the microcontroller control unit (22) starts the ultrasonic atomizer (6) and the fan I (7) through the drive module (24), and the atomized water vapor passes through the fan Ⅰ Enter the operation room (31). The single-chip control unit (22) starts the motor (9) through the drive module (24) to drive the column (27) and the ceramic orifice plate (20) on it to rotate slowly, causing the water mist to be evenly distributed in the operation room (31). If the temperature in the operating room (31) is lower than the preset value, the microcontroller control unit (22) starts the heating wire (8) and the fan I (7) through the drive module (24). If the humidity in the operating room (31) is higher than the preset value, the microcontroller control unit (22) starts the compressor (10) and the fan II (16) through the drive module (24), and the fan II (16) moves the operating room (31) ) is pumped out from the operating room (31) through the porous elastic insulation material (17). The water vapor encounters the condenser (15) and liquefies, flows through the water collection tank (29), and is collected by the automatic drain valve (13). Water tank II (12) is discharged through the water outlet (11). If the temperature in the operating room (31) is higher than the preset value, the microcontroller control unit (22) starts the compressor (10) and the fan II (16) through the drive module (24), and the fan II (16) will pass through the condenser (24). 15) The pre-cooled air is blown into the operation room (31) through the porous elastic thermal insulation material (17). According to the predetermined program, the microcontroller control unit (22) starts the micro weighing load cell (21) through the conversion module (23) at certain intervals to weigh the weight of the soil sample multiple times until it reaches a constant weight. When the weight of the soil sample remains constant outside the preset time period, the microcontroller control unit (22) starts the electric heating wire (8) and fan I (7) through the drive module (24) to dry the soil sample. According to the predetermined program, at certain intervals, the microcontroller control unit (22) starts the micro weighing load cell (21) through the conversion module (23) to weigh the weight of the soil sample multiple times until the weight is constant. The experiment is over. The results are calculated by the predetermined program of the microcontroller control unit (22), and displayed on the liquid crystal display (28) through the general-purpose I/O (25).

Claims (1)

1. A full-automatic maximum moisture absorption water tester is characterized in that: a motor (9) is arranged in a device shell (1), a table column (27) is arranged in an operation room (31), the table column (27) is fixedly arranged with the motor (9), a humidity sensor (19), a temperature sensor (18) and a plurality of layers Tao Kongban (20) are arranged on the table column (27), a plurality of miniature weighing force transducers (21) are arranged on the Tao Kongban (20), a compressor (10) is arranged in the device shell (1), the compressor (10) is connected with a condenser (15) and an evaporator (14) in a ring shape in sequence, the evaporator (14) is arranged outside the device shell (1), a fan II (16) and a perforated elastic heat insulation material (17) are arranged outside the condenser (15), a water collecting tank (29), an automatic drain valve II (13), a water tank II (12) and a water outlet (11) are arranged below the condenser (15), the perforated elastic heat insulation material (17) and the device shell (1) form the operation room (31), a communication cavity (1) is provided with an automatic heating wire (6) which is communicated with an ultrasonic wave heat insulation cavity I, an atomizing device (6) is arranged below the atomizing valve (8) and an atomizing device (6) from below the atomizing cavity I, the automatic drain valve I (5) is characterized in that a water tank I (3) is arranged above the automatic drain valve I (5), a liquid level sensor (4) is arranged in the water tank I (3), a control circuit assembly (26) is arranged on the device shell (1), the control circuit assembly (26) consists of a singlechip control unit (22), a general I/O (25), a liquid crystal display screen (28), a key (2), a driving module (24) and a conversion module (23), the liquid crystal display screen (28) is communicated with the singlechip control unit (22) through the general I/O (25), the key (2) is communicated with the singlechip control unit (22), an ultrasonic atomizer (6), a compressor (10), a motor (9), an electric fan I (7), an electric fan II (16) and an electric heating wire (8) are communicated with the singlechip control unit (22) through the driving module (24), and a micro weighing force transducer (21), the liquid level sensor (4), a humidity sensor (19) and a temperature sensor (18) are communicated with the singlechip control unit (22) through the conversion module (23);

if the humidity in the operation room (31) is lower than a preset value, the single chip microcomputer control unit (22) starts the ultrasonic atomizer (6) and the fan I (7) through the driving module (24), atomized water vapor enters the operation room (31) through the fan I, the single chip microcomputer control unit (22) drives the table post (27) and the Tao Kongban (20) on the table post to slowly rotate through the driving module (24), so that the water mist in the operation room (31) is uniformly distributed, if the temperature in the operation room (31) is lower than the preset value, the single chip microcomputer control unit (22) starts the electric heating wire (8) and the fan I (7) through the driving module (24), if the humidity in the operation room (31) is higher than the preset value, the single chip microcomputer control unit (22) starts the compressor (10) and the fan II (16) through the driving module (24), and the fan II (16) pumps the water vapor in the operation room (31) outwards from the operation room (31) through the perforated elastic heat insulation material (17).