CN219657527U - Accurate device for testing temperature shrinkage and dry shrinkage of concrete test piece - Google Patents

Abstract

The utility model discloses a precision device for testing temperature shrinkage and drying shrinkage of a concrete test piece, which comprises a test box body, a heating system, a centrifugal circulating system, a refrigerating system, a humidifying system, a testing system and a balance temperature and humidity control system, wherein the test box body is provided with a plurality of temperature sensors; the centrifugal circulating system comprises an air motor, a centrifugal fan and a temperature control and humidity control partition plate with an opening; the heating system, the refrigerating system and the humidifying system are used for heating, cooling and humidifying the air flow in the test outer box and are brought into the test inner box through the centrifugal fan; the test system comprises a test piece placement domain, and a fiber bragg grating sensor is arranged on the test piece placement domain; the balance temperature and humidity control system comprises a PC end liquid crystal display programmable controller. The utility model adopts the design structure of the centrifugal fan and the wind-carrying motor which are vertically symmetrical and reversely turns to form the power source of the air inlet and the air outlet of the test inner box, so that the temperature and humidity states of all parts of the test piece of the test inner box are more balanced, and the test data are more accurate.

Description

Accurate device for testing temperature shrinkage and dry shrinkage of concrete test piece

Technical Field

The utility model relates to the technical field of test equipment, in particular to a precision device for testing the temperature shrinkage and dry shrinkage of a concrete test piece.

Background

The precise device for testing the temperature shrinkage and the dry shrinkage of the concrete test piece is testing equipment used in the scientific research and commercial fields of road building materials, and is mainly used for testing the change parameters of the concrete test piece in the freeze thawing cycle process. In the prior art, the parameters are measured mainly through a dial indicator method and a strain gauge method, but the method is obviously influenced by human factors and external environments, so that larger errors are generated in test data of a test piece, and the accuracy of a test result is seriously influenced.

Through market research, the current instrument has not only above-mentioned limitation, and the air current that the fan blown out in the main tank body distributes unevenly in the box inside, leads to the test piece in the box in different positions to receive temperature and humidity equilibrium nature relatively poor under the same accuse temperature accuse wet environment, and because the circulation system is passive circulation in the box, has apparent influence to the temperature and humidity homogeneity and the lift temperature rate of each position of test piece in the box, also can lead to the test result inaccurate.

In view of this, the present utility model has been made.

Disclosure of Invention

The utility model aims to provide a precision device for testing temperature shrinkage and drying shrinkage of a concrete test piece, which adopts a design structure of which a centrifugal fan and a wind-carrying motor are vertically symmetrical and the upper and lower centrifugal fans adopt opposite directions to actively circulate wind inlet and wind outlet, and adopts a temperature-control humidity-control partition board which is vertically symmetrical and has the same opening aperture size to transmit wind force and dry and wet quantity of the test inner box, so that the phenomenon of uneven temperature of the test piece caused by the passive circulation in the prior art is obviously improved, the temperature and wet quantity of each part of the test piece are more balanced, and the test data are more accurate.

The utility model is realized by the following technical scheme:

the precise device for testing the temperature shrinkage and dryness of the concrete test piece comprises a test box body, a heating system, a centrifugal circulation system, a refrigerating system, a humidifying system, a testing system and a balance temperature and humidity control system; the test box body comprises a test outer box and a test inner box arranged in the test outer box, and the top and the bottom of the side wall of the test inner box are respectively provided with an air inlet and an air outlet; the centrifugal circulating system comprises an air-carrying motor, centrifugal fans and a temperature-control humidity-control partition plate with an opening, wherein the two centrifugal fans are symmetrically arranged at an air inlet and an air outlet in the test outer box up and down, and the directions of the upper centrifugal fan and the lower centrifugal fan are opposite; the wind-carrying motor drives the centrifugal fan to rotate; the two temperature and humidity control partition boards are vertically symmetrically arranged in parallel between an air inlet and an air outlet in the test inner box; the heating system is used for heating the air flow in the test outer box and bringing the air flow into the test inner box through the centrifugal fan; the refrigerating system is used for cooling air flow in the test outer box and is brought into the test inner box through the centrifugal fan; the humidifying system is used for humidifying the air flow in the test outer box and bringing the air flow into the test inner box through the centrifugal fan; the test system comprises a test piece placement area arranged between two temperature control and humidity control partition boards, and an optical fiber grating sensor is arranged on the test piece placement area; the balance temperature and humidity control system comprises a PC end liquid crystal display programmable controller.

The utility model adopts a design structure that the centrifugal fans and the wind-carrying motors are vertically symmetrical, and the upper centrifugal fans and the lower centrifugal fans are reversely turned, so that the power sources of the air inlet and the air outlet of the test inner box are formed to perform active circulation of air inlet and air outlet, and the passive circulation led by the opposite turning directions of the traditional unidirectional fans can be changed into active circulation, so that the temperature and humidity states of all parts of a test piece of the test inner box are more balanced; meanwhile, the temperature and humidity control partition boards which are vertically symmetrical and have the same opening aperture size are adopted to transfer wind power and dry humidity of the test inner box, so that the phenomenon of uneven air flow caused by passive circulation of the test inner box due to arrangement of the unilateral symmetrical reverse circulation fan in the prior art is avoided, the temperature and humidity of each part of the test piece are more balanced, and test data are more accurate.

Further, the heating system comprises a heating pipe arranged in the test outer box, and the heating pipe is arranged between the two centrifugal fans. The main function of the heating system of the utility model is to trigger the power supply by the balance temperature and humidity control system according to Joule's law (Q=I ² Rt, Q is heat, I is current, R is resistance, t is time) to electrify the resistance wire in the heater to generate heat, then the heat is sent to the test inner box through the centrifugal circulation system to regulate the energy.

Further, the refrigeration system includes a compressor, a condenser, an oil separator, and an evaporator disposed between the two centrifugal fans. According to the utility model, the refrigerating system sucks in refrigerant gas through the compressor to provide power for refrigeration cycle, lubricating oil discharged from the compressor is separated through the oil separator, then heat converted by the evaporator and the compressor is taken away through the condenser and is automatically loaded in the main box body through the evaporator to adjust the capacity, so that the temperature of the test inner box is reduced.

Further, the humidifying system comprises an ultrasonic humidifier, a water tank, a dry-wet ball water level box and a dry-wet ball temperature measuring body, water in the water tank is heated to a boiling point, the ultrasonic humidifier adopts ultrasonic high-frequency oscillation to atomize water in the water tank into ultrafine particles below 5um, and the ultrafine particles are diffused into the test inner box through a centrifugal circulating system, so that more and smaller particles can be more uniformly distributed in the test inner box, and humidity difference among all parts of a test piece is reduced, thereby achieving the purpose of uniformly humidifying the environment of the test inner box from a humidifying source; in the period, the temperature of the water vapor and the water level required by the ultrasonic humidifier are respectively tested through the dry-wet ball water level box and the dry-wet ball temperature measuring body, so that the water level and the temperature and humidity conditions required by the test box body are subjected to balanced test to ensure the normal operation of the instrument; the ultrasonic humidifier is arranged at an air outlet of the centrifugal fan at the lower part of the test outer box, and ultra-fine particles atomized by the ultrasonic humidifier are driven to uniformly enter the test inner box through reverse circulation of the centrifugal circulating fan; the humidifying system further comprises a dry-wet ball water level box and a dry-wet ball temperature measuring body which are arranged in the test outer box.

Further, test bed case is connected with to test outer box below, and two fortune wind motors set up respectively at the top and the bottom outside the test box, and compressor, condenser and oil separator all set up in test bed case, are close to fortune wind motor department on the test bed case lateral wall and are equipped with the opening, and radiator fan screen panel is installed in the opening part in order to be convenient for instrument during operation each instrument thermal discharge in the test bed case of device.

Furthermore, the centrifugal fan adopts multi-wing stainless steel Zhu Long, so that the heat and humidity circulation quantity can be accelerated; the temperature and humidity control partition plate is made of SUS#304 mirror surface stainless steel plates, can keep heat and humidity to be uniformly transferred under the action of a centrifugal fan, and the SUS#304 stainless steel plates have corrosion resistance and good heat conduction performance; the plastic spraying treatment is adopted for the steel plate of the test outer box, so that the corrosion resistance and the attractive performance of the instrument can be enhanced, and the heat insulation material adopts hard foam and glass wool, so that the box body has good flame retardant performance and sound absorption capability.

The fiber bragg grating sensor of the testing system is used for acquiring the temperature, stress and strain change conditions of the temperature shrinkage and the dry shrinkage of the concrete test piece through the wavelength change range, overcomes the limitation that the current digital temperature sensor and the temperature sensor can only detect key points and the complicated arrangement of a plurality of sensors, simultaneously draws a stress-strain curve through a PC end remote programmable controller, indirectly reflects the deformation resistance of the test piece in the temperature shrinkage and the dry shrinkage process through elastic modulus, and dynamically determines the temperature and humidity change conditions of the test piece of the test inner box through multi-point detection. The sensor also has the characteristics of flexible communication and alarm processes, the defect that the instrument delays and alarms due to the abnormality of a test piece in the detection process is avoided, the fiber bragg grating demodulator demodulates the data acquired by the fiber bragg grating sensor, the stress-strain curve is drawn through the PC end remote programmable controller, and the deformation resistance of the test piece in the temperature shrinkage and dry shrinkage state is quantized by using the elastic modulus. The technology is combined with the technology that the temperature and humidity of each part of the test piece are more balanced under a certain temperature and humidity control environment by the precision device, so that the test data can be more accurate.

The main working principle of the test system is that the fiber bragg grating sensor arranged on the test piece placement area passes through the wavelength (lambda _b =2nΛ, where λ _b Is wavelength; Λ is the grating period; n is the effective refractive index of the optical fiber mode), the state of the thermal shrinkage dry shrinkage test piece is recorded, and then the thermal shrinkage dry shrinkage test piece is demodulated by a fiber grating demodulator.

The heating system, the refrigerating system, the centrifugal circulating system, the humidifying system and the testing system are all controlled by a program control group and a memory capacity of the balance temperature and humidity control system in a unified and coordinated mode, and a three-dimensional simplified model is established to simulate the airflow circulating process after the system is arranged. The main principle of the balance temperature and humidity control system is that the temperature and humidity can be controlled simultaneously by a PC end liquid crystal programmable controller, so that the temperature and humidity quantity of each part of the concrete test piece is more uniform. The balance temperature and humidity control system mainly comprises a PC end liquid crystal display programmable controller 14, a usable program control group and a memory capacity program are used for uniformly controlling a heating system, a centrifugal circulating system, a refrigerating system, a humidifying system and a testing system through a display function, so that the temperature and humidity of each part of a test piece are relatively more uniform in a certain temperature and humidity control process of a precise device for testing the temperature shrinkage and drying shrinkage of the concrete test piece, the temperature and humidity of each part of the test piece are relatively higher in temperature and humidity control process, the temperature and humidity increasing efficiency is higher, and meanwhile, the stress-strain curve of the test piece in a certain temperature and humidity state is drawn in coordination with the testing system, and the deformation resistance of the test piece is indirectly reflected by means of elastic modulus.

Further, a three-dimensional simplified model of the precise device test inner box for testing the temperature shrinkage and the drying shrinkage of the concrete test piece is established and used for simulating the distribution state of air flow of the test inner box after the centrifugal symmetrical circulating fan and the open temperature control and humidity control partition plate act in the test box under the same temperature control and humidity control environment, so that the optimal placement position of the concrete test piece in the detection device is determined.

Through simulation, the fact that the temperature and humidity difference of the test piece at different positions is remarkable due to the fact that air flow behind the test inner box cannot be blown downwards evenly and vertically, and therefore the test piece placement area is required to be arranged at the position, relatively centered up and down, of the test inner box and close to the position, centered in front of the test inner box body.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. according to the precise device for testing the temperature shrinkage and the dry shrinkage of the concrete test piece, provided by the embodiment of the utility model, the design concept that the centrifugal circulating fan and the air-carrying motor are vertically symmetrical and the rotating speeds are opposite is adopted, so that the passive circulation led by the opposite steering directions of the traditional unidirectional multiple fans can be changed into the active circulation, the temperature and humidity states of all parts of the test piece of the test inner box are more balanced, the temperature and humidity transmission balance is improved by adopting the open temperature and humidity control partition board on the basis, the temperature and humidity quantity of all parts of the test piece is more balanced, and the test data is more accurate;

2. according to the precise device for testing the temperature shrinkage and the dry shrinkage of the concrete test piece, provided by the embodiment of the utility model, the ultrasonic humidifier is adopted in the humidifying system and is arranged at the air outlet of the test outer box, so that water vapor can be atomized into ultrafine particles through ultrasonic oscillation and diffused into the box body, and the humidity difference among all parts of the test piece is reduced, thereby achieving the purpose of uniformly humidifying the environment of the test inner box from a humidifying source;

3. according to the precise device for testing the temperature shrinkage and dryness of the concrete test piece, provided by the embodiment of the utility model, the fiber bragg grating sensor is arranged on the test piece placement area, so that the stress-strain state of the test piece of the test inner box can be detected, the deformation resistance capability of the test piece under the condition of temperature and humidity change is dynamically determined by means of the elastic modulus, and the test data can be more accurate by combining the technology for improving the temperature and humidity balance of each part of the test piece.

Drawings

In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a precision apparatus according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a temperature and humidity controlling separator according to an embodiment of the present utility model;

FIG. 3 is a simulated vector diagram of the air flow distribution of the whole test inner box in a certain temperature and humidity control environment;

FIG. 4 is a simulated vector diagram of the prior art test chamber airflow using a single fan and no baffle;

FIG. 5 is a simulated vector diagram of the air flow of the test chamber after the circulating fan and the temperature and humidity control partition are adopted in the embodiment of the utility model.

In the drawings, the reference numerals and corresponding part names:

the device comprises a 1-centrifugal fan, a 2-heater, a 3-evaporator, a 4-condenser, a 5-oil separator, a 6-compressor, a 7-wind-carrying motor, an 8-dry-wet ball water level box, a 9-dry-wet ball temperature measuring body, a 10-circulating air inlet, a 11-temperature and humidity control partition board, a 12-circulating air outlet, a 13-ultrasonic humidifier, a 14-PC end liquid crystal display programmable controller, a 15-water tank, a 16-test specimen placement area, a 17-fiber grating sensor, a 18-fiber grating demodulator and a 19-cooling fan screen.

Detailed Description

For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present utility model and the descriptions thereof are for illustrating the present utility model only and are not to be construed as limiting the present utility model.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the utility model. In other instances, well-known structures have not been described in detail in order to avoid obscuring the present utility model.

Throughout the specification, references to "one embodiment," "an embodiment," "one example," or "an example" mean: a particular feature, structure, or characteristic described in connection with the embodiment or example is included within at least one embodiment of the utility model. Thus, the appearances of the phrases "in one embodiment," "in an example," or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Moreover, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and that the illustrations are not necessarily drawn to scale. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In the description of the present utility model, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present utility model.

Examples

1-5, the precise device for testing the temperature shrinkage and dryness of the concrete test piece provided by the embodiment of the utility model comprises a test box body, a heating system, a centrifugal circulating system, a refrigerating system, a humidifying system, a testing system and a balance temperature and humidity control system; the test box body comprises a test outer box and a test inner box arranged in the test outer box, and an air inlet 10 and an air outlet 12 are respectively formed in the top and the bottom of the side wall of the test inner box; the centrifugal circulating system comprises an air-carrying motor 7, centrifugal fans 1 and a temperature-control and humidity-control partition plate 11 with openings, wherein the two centrifugal fans 1 are symmetrically arranged at an air inlet 10 and an air outlet 12 in the test outer box up and down, and the directions of the upper centrifugal fan 1 and the lower centrifugal fan 1 are opposite; the wind-carrying motor 7 drives the centrifugal fan 1 to rotate; the two temperature and humidity control partition boards 11 are vertically symmetrically arranged in parallel between the air inlet 10 and the air outlet 12 in the test inner box; the heating system is used for heating the air flow in the test outer box and bringing the air flow into the test inner box through the centrifugal fan 1; the refrigerating system is used for cooling air flow in the test outer box and is brought into the test inner box through the centrifugal fan 1; the humidifying system is used for humidifying the air flow in the test outer box and bringing the air flow into the test inner box through the centrifugal fan 1; the test system comprises a test piece placement area 16 arranged between two temperature control and humidity control clapboards 11, and a fiber bragg grating sensor 18 is arranged on the test piece placement area 16; the balance temperature and humidity control system comprises a PC end liquid crystal display programmable controller 14.

The utility model adopts a design structure that the centrifugal fans and the wind-carrying motors are vertically symmetrical, and the upper centrifugal fans and the lower centrifugal fans are reversely turned, so that the power sources of the air inlet and the air outlet of the test inner box are formed to perform active circulation of air inlet and air outlet, and the passive circulation led by the opposite turning directions of the traditional unidirectional fans can be changed into active circulation, so that the temperature and humidity states of all parts of a test piece of the test inner box are more balanced; meanwhile, the temperature and humidity control partition boards which are vertically symmetrical and have the same opening aperture size are adopted to transfer wind power and dry humidity of the test inner box, so that the phenomenon of uneven air flow caused by passive circulation of the test inner box due to arrangement of the unilateral symmetrical reverse circulation fan in the prior art is avoided, the temperature and humidity of each part of the test piece are more balanced, and test data are more accurate.

Further, the heating system comprises a heating pipe 2 arranged in the test outer box, and the heating pipe 2 is arranged between the two centrifugal fans 1. The main function of the heating system is to trigger a power supply through a balance temperature and humidity control system, and according to Joule's law Q=I ² Rt, Q is heat, I is current, R is resistance, t is time to electrify and heat the resistance wire in the heater, and then the heat is sent to the test inner box through the centrifugal circulation system to regulate energy.

Further, the refrigeration system comprises a compressor 6, a condenser 4, an oil separator 5 and an evaporator 3, wherein the evaporator 3 is arranged between the two centrifugal fans 1. According to the utility model, the refrigerating system sucks refrigerant gas into the compressor 6 to provide power for refrigeration cycle, the lubricating oil discharged by the compressor 6 is separated through the oil separator 5, then heat converted by the evaporator 3 and the compressor 6 is taken away through a cooling medium through the condenser 4, and the automatic load capacity adjustment in the main box body is carried out through the evaporator 3, so that the temperature reduction of the test inner box is realized.

Further, the humidifying system comprises an ultrasonic humidifier 13, a water tank 15, a dry and wet ball water level box 8 and a dry and wet ball temperature measuring body 9, water in the water tank is heated to a boiling point, the ultrasonic humidifier 13 adopts ultrasonic high-frequency oscillation to atomize water in the water tank 15 into ultra-fine particles below 5um, and the ultra-fine particles are diffused into the test inner box through a centrifugal circulating system, so that more and smaller particles can be more uniformly distributed in the test inner box, and humidity difference among all parts of a test piece is reduced, thereby achieving the purpose of uniformly humidifying the environment of the test inner box from a humidifying source; in the process, the temperature of water vapor and the water level required by the ultrasonic humidifier are respectively tested through the dry-wet ball water level box 8 and the dry-wet ball temperature measuring body 9, so that the water level and the temperature and humidity conditions required by the test box body are subjected to balanced test to ensure the normal operation of the instrument; the ultrasonic humidifier 13 is arranged at an air outlet of the centrifugal fan 1 at the lower part of the test outer box, and ultra-fine particles atomized by the ultrasonic humidifier are driven to uniformly enter the test inner box through reverse circulation of the centrifugal circulating fan; the humidifying system further comprises a dry-wet ball water level box 8 and a dry-wet ball temperature measuring body 9 which are arranged in the test outer box.

Further, the test outer box below is connected with the test bed box, and two fortune wind motors 7 set up respectively at the top and the bottom outside the test box, and compressor 6, condenser 4 and oil separator 5 all set up in the test bed box, are close to fortune wind motor 7 department and are equipped with the opening on the test bed box lateral wall, and radiator fan screen panel 19 is installed in the opening part in order to be convenient for the instrument during operation each instrument thermal discharge in the test bed box of device.

Furthermore, the centrifugal fan adopts multi-wing stainless steel Zhu Long, so that the heat and humidity circulation quantity can be accelerated; the temperature and humidity control partition plate 11 is made of an SUS#304 mirror surface stainless steel plate, can keep heat and humidity to be uniformly transferred under the action of the centrifugal fan 1, and has corrosion resistance and good heat conduction performance; the plastic spraying treatment is adopted for the steel plate of the test outer box, so that the corrosion resistance and the attractive performance of the instrument can be enhanced, and the heat insulation material adopts hard foam and glass wool, so that the box body has good flame retardant performance and sound absorption capability.

The working process of the utility model is as follows:

firstly, a test specimen is placed on a specimen placement area 16 with a fiber grating sensor 17, then a power supply is connected, and a program control group (program: PATTEN) and a memory capacity (SEGMENTS) in a precise device for testing the temperature shrinkage and the dryness of a concrete specimen are uniformly regulated and controlled by a PC end liquid crystal programmable controller 14 of a balance temperature and humidity regulating control system to a heating and humidifying system, a centrifugal circulating system, a refrigerating system and a testing system. The Program (PATTEN) under the control of the programmable controller 14 uniformly coordinates the system to form a first freeze-thawing cycle, and then the first freeze-thawing cycle is continuously repeated under the action of the program (SEGMENTS) so as to achieve the time required by the test, and the test process is recorded by the PC-end liquid crystal programmable controller 14 to reveal the freeze-thawing cycle rule of the test piece in the temperature shrinkage drying shrinkage precision device of the test concrete test piece.

In the above process, the heating system mainly releases heat through the thermal resistor in the heating pipe 2; the refrigerating system sucks refrigerant gas through the compressor 6 to provide power for refrigeration cycle, the lubricating oil discharged by the compressor 6 is separated through the oil separator 5, and then the heat converted by the evaporator 3 and the compressor 6 is taken away through the condenser 4 by a cooling medium; the humidifying system adopts ultrasonic high-frequency oscillation to atomize water in the water tank 15 into ultra-fine particles below 5um by the ultrasonic humidifier 13, and diffuses the ultra-fine particles into the main tank body, thereby achieving the purpose of uniformly humidifying the environment of the test inner tank from a humidifying source; in the centrifugal circulation system, a centrifugal symmetrical fan 1 with opposite vertical symmetry and a temperature and humidity control partition board 11 with vertical symmetry are used for more uniformly and efficiently conveying energy and humidity generated by a heating system, a refrigerating system and a humidifying system to a test inner box; the test system carries out multi-point observation on stress and strain of a test piece along with the cyclic process of temperature and humidity through the wavelength released by the fiber grating sensor 17 arranged on the test piece placement area, dynamically determines, and then demodulates the stress and strain through the fiber grating demodulator 18; finally, the PC-end liquid crystal display programmable controller 14 is used for acquiring the change conditions of the test piece in different temperature and humidity control environments, so as to assist the test system to draw a stress-strain change curve of the test piece in the temperature and humidity change process, and the deformation resistance of the test piece under the freeze thawing cycle is reflected by means of the elastic modulus, so that the temperature shrinkage and drying shrinkage cycle process of the test piece in the test box of the temperature shrinkage and drying shrinkage precision device of the test concrete test piece can be reflected more accurately.

According to the utility model, the three-dimensional simplified model of the test inner box of the temperature shrinkage drying shrinkage precision device for testing the concrete test piece is established and is used for simulating the distribution condition of air flow under the same temperature control and humidity control environment, so that the setting position of the test piece in the placement area of the test inner box is determined, and the temperature control and humidity control effect of the test piece under a certain temperature control and humidity control environment is better.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.

Claims (10)

1. The precise device for testing the temperature shrinkage and dryness of the concrete test piece is characterized by comprising a test box body, a heating system, a centrifugal circulating system, a refrigerating system, a humidifying system, a testing system and a balance temperature and humidity control system;

the test box body comprises a test outer box and a test inner box arranged in the test outer box, and an air inlet (10) and an air outlet (12) are respectively formed in the top and the bottom of the side wall of the test inner box;

the centrifugal circulating system comprises an air-carrying motor (7), a centrifugal fan (1) and a temperature-control and humidity-control partition plate (11) with an opening, wherein the two centrifugal fans (1) are symmetrically arranged at an air inlet (10) and an air outlet (12) in the test outer box; the wind-carrying motor (7) drives the centrifugal fan (1) to rotate; the two temperature and humidity control partition boards (11) are vertically symmetrically arranged in parallel between an air inlet (10) and an air outlet (12) in the test inner box;

the heating system is used for heating the air flow in the test outer box and bringing the air flow into the test inner box through the centrifugal fan (1);

the refrigerating system is used for cooling air flow in the test outer box and is brought into the test inner box through the centrifugal fan (1);

the humidifying system is used for humidifying the air flow in the test outer box and is brought into the test inner box through the centrifugal fan (1);

the test system comprises a test specimen placement area (16) arranged between two temperature control and humidity control partition boards (11), and a fiber grating sensor (17) is arranged on the test specimen placement area (16);

the balance temperature and humidity control system comprises a PC end liquid crystal display programmable controller (14).

2. The precision device for testing the temperature shrinkage and dryness of a concrete test piece according to claim 1 is characterized in that the directions of the upper centrifugal fan (1) and the lower centrifugal fan (1) are opposite.

3. The precision device for testing the temperature shrinkage and dryness of a concrete test piece according to claim 1, wherein the heating system comprises a heating pipe (2) arranged in a test outer box, and the heating pipe (2) is arranged between two centrifugal fans (1).

4. The precise device for testing the temperature shrinkage and dryness of a concrete test piece according to claim 1, wherein the refrigerating system comprises a compressor (6), a condenser (4), an oil separator (5) and an evaporator (3), and the evaporator (3) is arranged between two centrifugal fans (1).

5. The precise device for testing the temperature shrinkage and dryness of the concrete test piece according to claim 1, wherein the humidifying system comprises an ultrasonic humidifier (13), and the ultrasonic humidifier (13) is arranged at an air outlet of a centrifugal fan (1) at the lower part of the test outer box.

6. The precise device for testing the temperature shrinkage and dryness of the concrete test piece according to claim 5, wherein the humidifying system further comprises a water tank (15), a dry-wet ball water level box (8) and a dry-wet ball temperature measuring body (9), and the dry-wet ball water level box (8) and the dry-wet ball temperature measuring body (9) are arranged in the test outer box.

7. The precision device for testing the shrinkage of a concrete test piece according to claim 1, wherein the testing system further comprises a fiber grating demodulator (18).

8. The precise device for testing the temperature shrinkage and dryness of a concrete test piece according to claim 4, wherein a test bottom box is connected below the test outer box, two wind-carrying motors (7) are respectively arranged at the top and the bottom outside the test box, and the compressor (6), the condenser (4) and the oil separator (5) are all arranged in the test bottom box.

9. The precise device for testing the temperature shrinkage and dryness of a concrete sample according to claim 1, wherein the temperature-control and humidity-control partition plate (11) is made of SUS#304 mirror surface stainless steel plates.

10. The precise device for testing the temperature shrinkage and dryness of the concrete test piece according to claim 8, wherein an opening is formed in the side wall of the test bed box, which is close to the wind-carrying motor (7), and a cooling fan net cover (19) is arranged at the opening.