Freeze-thaw experimental equipment for concrete durability detection

Abstract

The utility model discloses freezing and thawing experimental equipment for concrete durability detection, which comprises an experimental box, a controller is arranged at the top of the experimental box, mounting mechanisms are mounted on the left side and the right side of an inner cavity of the experimental box, and a freezing and thawing mechanism is mounted on the rear side of the experimental box; the freezing and thawing mechanism comprises two liquid storage tanks which are symmetrically arranged up and down, a semiconductor refrigerator is fixedly mounted at the top of the liquid storage tank on the upper side, an electric heater is fixedly mounted at the bottom of the liquid storage tank on the lower side, a liquid pump is fixedly mounted on the surface of each liquid storage tank, the liquid inlet end of each liquid pump is communicated with a coiled pipe, and the liquid inlet end of each coiled pipe is communicated with the corresponding liquid storage tank. The freezing and thawing experimental device for concrete durability detection has the advantage of efficient experiment, and solves the problems that in the using process of existing freezing and thawing experimental equipment for concrete durability detection, a concrete test piece is inconvenient to freeze and thaw quickly, the experimental time is prolonged, and the concrete durability detection efficiency is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete detection, in particular to freeze-thaw test equipment for concrete durability detection. Background Art

[0002] Freeze-thaw test equipment for concrete durability testing, usually called concrete rapid freeze-thaw test machine or concrete freeze-thaw test chamber, is an instrument specially designed to simulate the repeated freeze-thaw process of concrete materials in severe cold environments to evaluate the durability of concrete under freeze-thaw cycles. This equipment is widely used in the durability testing of concrete engineering in the fields of marine engineering, hydraulic engineering, bridges, tunnels, industrial and civil buildings, as well as the research work of concrete durability laboratories in scientific research institutions.

[0003] The existing freeze-thaw test equipment for concrete durability testing is not convenient for quickly freezing and thawing concrete specimens during use, which increases the test time and reduces the efficiency of concrete durability testing. Utility Model Content

[0004] The utility model aims to provide a freeze-thaw test equipment for concrete durability testing, which has the advantage of efficient experiment and solves the problem that the existing freeze-thaw test equipment for concrete durability testing is not convenient for quickly freezing and thawing concrete specimens during use, which increases the experiment time and reduces the efficiency of concrete durability testing.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a freeze-thaw test device for concrete durability detection, comprising a test box, a controller is provided on the top of the test box, installation mechanisms are installed on both the left and right sides of the inner cavity of the test box, and a freeze-thaw mechanism is installed on the rear side of the test box;

[0006] The freeze-thaw mechanism includes two liquid storage tanks symmetrically arranged in an upper and lower manner, a semiconductor refrigerator is fixedly installed on the top of the upper liquid storage tank, an electric heater is fixedly installed on the bottom of the lower liquid storage tank, a liquid pump is fixedly installed on the surface of the liquid storage tank, the liquid inlet end of the liquid pump is connected to a serpentine tube, the liquid inlet end of the serpentine tube is connected to the liquid storage tank, the number of the serpentine tubes is two, and they are distributed on the upper and lower sides of the inner cavity of the experimental box.

[0007] As a preferred freeze-thaw test equipment for concrete durability detection of the utility model, the test box includes an insulating box body, a box cover is rotatably connected to the surface of the insulating box body, a screw is provided on the box cover, a threaded hole for use with the screw is opened on the front side of the insulating box body, and a temperature sensor is fixedly installed on the rear side of the insulating box body.

[0008] As a preferred freeze-thaw test equipment for concrete durability testing of the utility model, the installation mechanism includes a rotating frame, which is rotatably connected to the inner wall of the insulation box, and a stepper motor is provided at one end of the rotating frame. The stepper motor is fixedly installed on the surface of the insulation box, and the output shaft of the stepper motor is fixedly connected to the rotating frame through a coupling.

[0009] As a preferred freeze-thaw test equipment for concrete durability testing of the utility model, a cylinder is fixedly installed on one side of the rotating frame, the piston rod of the cylinder is fixedly connected to a sliding member, and two clamps are rotatably connected to the front side of the rotating frame, and connecting rods are rotatably connected to the two clamps, and the connecting rods are rotatably connected to the upper and lower ends of the sliding member.

[0010] As a preferred freeze-thaw test equipment for concrete durability testing of the utility model, the liquid outlet end of the liquid pump penetrates into the inner cavity of the liquid storage tank, the front side of the liquid storage tank is fixedly connected to a fixing frame, the fixing frame is fixedly connected to the rear side of the test box, and the surface of the liquid storage tank is connected to a liquid replacement valve.

[0011] As a preferred freeze-thaw experimental equipment for concrete durability testing of the utility model, the semiconductor refrigerator includes a semiconductor refrigeration plate, a cooler is installed at the cold end of the semiconductor refrigeration plate, the cooler passes through the inner cavity of the liquid storage tank on the upper side, a radiator is installed at the hot end of the semiconductor refrigeration plate, and a cooling fan is installed on the radiator.

[0012] As a preferred freeze-thaw test device for concrete durability testing of the utility model, the electric heater includes a heater body, a spiral electric heating tube is provided on the top of the heater body, and the spiral electric heating tube penetrates into the inner cavity of the liquid storage tank at the lower side.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] 1. The utility model can fix and rotate the concrete specimen by setting a mounting mechanism, so that the concrete specimen is evenly cooled and heated. The concrete specimen is mounted on the opposite side of the fixture, and the cylinder drives the sliding member to slide on the front side of the rotating frame. The sliding member drives the fixture to rotate through the connecting rod to clamp and fix the concrete specimen. When performing a freeze-thaw experiment, the stepper motors on the left and right sides simultaneously drive the rotating frame to rotate, and the rotating frame drives the concrete specimen to rotate slowly to cool or heat multiple surfaces of the concrete specimen.

[0015] 2. The utility model can facilitate efficient freeze-thaw of concrete specimens by arranging a freeze-thaw mechanism. When the concrete specimen needs to be frozen, the liquid exchange valve is used to add a refrigerant into the liquid storage tank on the upper side, and the semiconductor refrigerator cools the refrigerant inside the liquid storage tank. The cooled refrigerant circulates through the serpentine tube and the liquid pump. During the circulation process, the cold is conducted to the inner cavity of the insulation box through the serpentine tube on the upper side, thereby reducing the temperature inside the box and achieving freezing of the concrete specimen. When the concrete specimen needs to be thawed, a heat transfer liquid is added to the liquid storage tank on the lower side, and the electric heater heats the heat transfer liquid. The heated heat transfer liquid circulates through the serpentine tube and the liquid pump on the lower side, and the serpentine tube on the lower side conducts the heat to the inner cavity of the insulation box, thereby heating the air in the inner cavity of the insulation box and thawing the concrete specimen. The durability of the concrete specimen is tested by repeatedly freezing and thawing the concrete specimen. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the main axonometric drawing of the utility model;

[0017] Figure 2 This is the front view of the utility model;

[0018] Figure 3 This is the main axonometric drawing of the experimental box of the utility model;

[0019] Figure 4 This is the rear axonometric view of the experimental box of the utility model;

[0020] Figure 5 This is the main axonometric view of the installation mechanism of the utility model;

[0021] Figure 6 This is the main axonometric view of the freeze-thaw mechanism of the utility model;

[0022] Figure 7 This is a rear axonometric view of the freeze-thaw mechanism of the utility model;

[0023] Figure 8 This is a bottom-up axonometric view of the freeze-thaw mechanism of the utility model;

[0024] Fig. 9 This is the main axonometric view of the semiconductor refrigerator of the utility model;

[0025] Fig.10 This is the main axonometric view of the electric heater of the utility model.

[0026] In the figure: 1. Experiment box; 101. Insulation box body; 102. Box cover; 103. Screw; 104. Temperature sensor; 2. Mounting mechanism; 201. Rotating frame; 202. Stepping motor; 203. Cylinder; 204. Sliding part; 205. Connecting rod; 206. Clamp; 3. Freeze-thaw mechanism; 301. Liquid storage tank; 302. Semiconductor refrigerator; 3021. Semiconductor refrigerator; 3022. Cooling conductor; 3023. Cooling fan; 3024. Radiator; 303. Electric heater; 3031. Heater body; 3032. Spiral electric heating tube; 304. Liquid exchange valve; 305. Liquid pump; 306. Fixed frame; 307. Serpentine tube; 4. Controller. DETAILED DESCRIPTION

[0027] See also Figure 1-Figure 10 A freeze-thaw test device for concrete durability detection includes a test box 1, a controller 4 is provided on the top of the test box 1, installation mechanisms 2 are installed on the left and right sides of the inner cavity of the test box 1, and a freeze-thaw mechanism 3 is installed on the rear side of the test box 1.

[0028] Furthermore, the experimental box 1 includes an insulated box body 101, a box cover 102 is rotatably connected to the surface of the insulated box body 101, a screw 103 is provided on the box cover 102, a threaded hole for use with the screw 103 is opened on the front side of the insulated box body 101, and a temperature sensor 104 is fixedly installed on the rear side of the insulated box body 101.

[0029] After closing the box cover 102 , screw the screw 103 into the threaded hole, so that the box cover 102 can be fixed on the front side of the heat preservation box body 101 to prevent the heat or cold inside the heat preservation box body 101 from being lost.

[0030] Furthermore, the mounting mechanism 2 includes a rotating frame 201, which is rotatably connected to the inner wall of the heat preservation box 101. A stepper motor 202 is provided at one end of the rotating frame 201. The stepper motor 202 is fixedly installed on the surface of the heat preservation box 101. The output shaft of the stepper motor 202 is fixedly connected to the rotating frame 201 through a coupling. A cylinder 203 is fixedly installed on one side of the rotating frame 201. The piston rod of the cylinder 203 is fixedly connected to a sliding member 204. Two clamps 206 are rotatably connected to the front side of the rotating frame 201. Both clamps 206 are rotatably connected to connecting rods 205. The connecting rods 205 are rotatably connected to the upper and lower ends of the sliding member 204.

[0031] By setting up the mounting mechanism 2, it is convenient to fix and rotate the concrete specimen so that the concrete specimen is evenly cooled and heated. The concrete specimen is mounted on the opposite side of the clamp 206. The cylinder 203 drives the sliding member 204 to slide in front of the rotating frame 201. The sliding member 204 drives the clamp 206 to rotate through the connecting rod 205 to clamp and fix the concrete specimen. When performing a freeze-thaw experiment, the stepper motors 202 on the left and right sides simultaneously drive the rotating frame 201 to rotate, and the rotating frame 201 drives the concrete specimen to rotate slowly to cool or heat multiple surfaces of the concrete specimen.

[0032] Furthermore, the freeze-thaw mechanism 3 includes two liquid storage tanks 301 symmetrically arranged in an upper and lower manner, a semiconductor refrigerator 302 is fixedly installed on the top of the upper liquid storage tank 301, an electric heater 303 is fixedly installed on the bottom of the lower liquid storage tank 301, a liquid pump 305 is fixedly installed on the surface of the liquid storage tank 301, and the liquid inlet end of the liquid pump 305 is connected to a serpentine tube 307, and the liquid inlet end of the serpentine tube 307 is connected to the liquid storage tank 301. There are two serpentine tubes 307, which are distributed on the upper and lower sides of the inner cavity of the experimental box 1.

[0033] Furthermore, the liquid outlet of the liquid pump 305 penetrates into the inner cavity of the liquid storage tank 301 , a fixing frame 306 is fixedly connected to the front side of the liquid storage tank 301 , the fixing frame 306 is fixedly connected to the rear side of the experimental box 1 , and a liquid replacement valve 304 is connected to the surface of the liquid storage tank 301 .

[0034] By setting the freeze-thaw mechanism 3, the concrete specimen can be efficiently freeze-thawed. When the concrete specimen needs to be frozen, the liquid exchange valve 304 is used to add the refrigerant into the upper liquid storage tank 301, and the semiconductor refrigerator 302 cools the refrigerant inside the liquid storage tank 301. The cooled refrigerant circulates through the serpentine tube 307 and the liquid pump 305. During the circulation process, the cold energy is transferred to the inner cavity of the heat preservation box 101 through the upper serpentine tube 307 to reduce the temperature inside the heat preservation box 101, thereby achieving the freezing of the concrete specimen. When the concrete specimen needs to be thawed, heat transfer liquid is added to the lower liquid storage tank 301, and the electric heater 303 heats the heat transfer liquid. The heated heat transfer liquid circulates through the lower serpentine tube 307 and the liquid pump 305. The lower serpentine tube 307 transfers the heat to the inner cavity of the insulation box 101, and heats the air in the inner cavity of the insulation box 101 to melt the concrete specimen. The durability of the concrete specimen is tested by repeatedly freezing and thawing the concrete specimen.

[0035] When performing a freeze-thaw experiment, the temperature sensor 104 detects the working temperature inside the thermal insulation box 101, and the detection signal is transmitted to the controller 4. The controller 4 controls the operation of the semiconductor refrigerator 302 and the electric heater 303 according to the detected value, so that the freezing temperature and the melting temperature inside the thermal insulation box 101 reach the preset values.

[0036] Furthermore, the semiconductor refrigerator 302 includes a semiconductor cooling plate 3021, a cooling conductor 3022 is installed at the cold end of the semiconductor cooling plate 3021, and the cooling conductor 3022 penetrates into the inner cavity of the upper liquid storage tank 301, and a radiator 3024 is installed at the hot end of the semiconductor cooling plate 3021, and a cooling fan 3023 is installed on the radiator 3024.

[0037] During the operation of the semiconductor refrigerator 302, the cold energy generated by the cold end of the semiconductor cooling plate 3021 is conducted to the interior of the upper liquid storage tank 301 through the cooler 3022 to cool the coolant. The radiator 3024 and the cooling fan 3023 dissipate the heat from the hot end of the semiconductor cooling plate 3021, so that the semiconductor cooling plate 3021 can work continuously and stably.

[0038] Furthermore, the electric heater 303 includes a heater body 3031 , a spiral electric heating tube 3032 is provided on the top of the heater body 3031 , and the spiral electric heating tube 3032 penetrates into the inner cavity of the lower liquid storage tank 301 .

[0039] During the operation of the electric heater 303 , the heater body 3031 is connected to the external mains electricity, and the spiral electric heating tube 3032 generates heat inside the lower liquid storage tank 301 after being energized, so as to heat the heat transfer liquid inside the lower liquid storage tank 301 .

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A freeze-thaw test device for concrete durability testing, comprising a test box (1), wherein a controller (4) is provided on the top of the test box (1), and wherein: The left and right sides of the inner cavity of the experimental box (1) are both equipped with mounting mechanisms (2), and the rear side of the experimental box (1) is equipped with a freeze-thaw mechanism (3); The freeze-thaw mechanism (3) comprises two liquid storage tanks (301) symmetrically arranged in an upper and lower manner, a semiconductor refrigerator (302) being fixedly mounted on the top of the upper liquid storage tank (301), and an electric heater (303) being fixedly mounted on the bottom of the lower liquid storage tank (301), a liquid pump (305) being fixedly mounted on the surface of the liquid storage tank (301), a liquid inlet end of the liquid pump (305) being connected to a serpentine tube (307), a liquid inlet end of the serpentine tube (307) being connected to the liquid storage tank (301), and two serpentine tubes (307) being arranged on the upper and lower sides of the inner cavity of the experimental box (1).

2. A freeze-thaw test equipment for concrete durability testing according to claim 1, characterized in that: The experimental box (1) comprises a heat-insulating box body (101), a box cover (102) being rotatably connected to the surface of the heat-insulating box body (101), a screw rod (103) being provided on the box cover (102), a threaded hole for use with the screw rod (103) being provided on the front side of the heat-insulating box body (101), and a temperature sensor (104) being fixedly mounted on the rear side of the heat-insulating box body (101).

3. The freeze-thaw test equipment for concrete durability testing according to claim 1, characterized in that: The mounting mechanism (2) comprises a rotating frame (201), the rotating frame (201) being rotatably connected to the inner wall of the heat preservation box (101), a stepping motor (202) being provided at one end of the rotating frame (201), the stepping motor (202) being fixedly mounted on the surface of the heat preservation box (101), and an output shaft of the stepping motor (202) being fixedly connected to the rotating frame (201) via a coupling.

4. A freeze-thaw test equipment for concrete durability testing according to claim 3, characterized in that: A cylinder (203) is fixedly mounted on one side of the rotating frame (201); a piston rod of the cylinder (203) is fixedly connected to a sliding member (204); two clamps (206) are rotatably connected to the front side of the rotating frame (201); connecting rods (205) are rotatably connected to the two clamps (206); and the connecting rods (205) are rotatably connected to the sliding member (204) at the upper and lower ends.

5. The freeze-thaw test equipment for concrete durability testing according to claim 1, characterized in that: The liquid outlet end of the liquid pump (305) penetrates into the inner cavity of the liquid storage box (301); a fixing frame (306) is fixedly connected to the front side of the liquid storage box (301); the fixing frame (306) is fixedly connected to the rear side of the experimental box (1); and a liquid replacement valve (304) is connected to the surface of the liquid storage box (301).

6. The freeze-thaw test equipment for concrete durability testing according to claim 1, characterized in that: The semiconductor refrigerator (302) comprises a semiconductor cooling plate (3021), a cooling conductor (3022) being installed at the cold end of the semiconductor cooling plate (3021), the cooling conductor (3022) penetrating into the inner cavity of the upper liquid storage tank (301), a radiator (3024) being installed at the hot end of the semiconductor cooling plate (3021), and a cooling fan (3023) being installed on the radiator (3024).

7. The freeze-thaw test equipment for concrete durability testing according to claim 1, characterized in that: The electric heater (303) comprises a heater body (3031), the top of the heater body (3031) is provided with a spiral electric heating tube (3032), and the spiral electric heating tube (3032) penetrates into the inner cavity of the liquid storage tank (301) at the lower side.

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