Rapid freezing and thawing testing machine for concrete

Abstract

The invention relates to the technical field of freezing and thawing testing machines, and particularly discloses a concrete rapid freezing and thawing testing machine which comprises a testing machine body. The testing machine body is provided with a testing cavity; a freezing device and a heating device are arranged in the test cavity; a placement cavity is formed in the testing machine body; a first storage tank and a second storage tank are fixedly connected to the inner side wall of the bottom end of the containing cavity. A first suction assembly and a second suction assembly are further arranged in the containing cavity. The first suction assembly can convey a test solution in the test cavity into the first storage tank for storage; the second suction assembly can convey the test solution in the test cavity into the second storage tank for storage; the heated solution and the frozen solution are respectively stored through the first storage tank and the second storage tank, so that the test solution in the first storage tank and the second storage tank can be conveniently recycled in multiple test processes, the energy consumption of the heating device and the freezing device is reduced, and the energy utilization rate is increased.

Description

Technical Field

[0001] This invention relates to the field of freeze-thaw testing machine technology, and in particular to a rapid freeze-thaw testing machine for concrete. Background Technology

[0002] The rapid freeze-thaw test of concrete involves exposing concrete specimens to freezing or thawing conditions and expressing the freeze-thaw resistance of the concrete by the number of rapid freeze-thaw cycles it undergoes. When testing the freeze-thaw resistance of concrete specimens, technicians place the concrete specimens in a specimen box containing a test solution. The test solution is circulated through heating and freezing devices within the specimen box, thus completing the freeze-thaw test of the concrete specimens.

[0003] In the existing technology, the heating and freezing devices use the same medium for heating and freezing. That is, when the test solution needs to be frozen after being heated, the freezing component needs to cool down the heated test solution to freeze it. Similarly, when the test solution needs to be thawed after being frozen, the heating component needs to thaw the frozen test solution before freezing it. The heating and freezing devices consume a lot of energy and have low energy utilization. Summary of the Invention

[0004] This application provides a rapid freeze-thaw testing machine for concrete, which reduces the energy consumption of heating and freezing devices and improves energy utilization.

[0005] This application provides a rapid freeze-thaw testing machine for concrete, which adopts the following technical solution: A rapid freeze-thaw testing machine for concrete includes a machine body; the machine body is provided with a test chamber for holding a test solution; the test chamber is provided with a freezing device and a heating device for performing freeze-thaw operations on the test solution; the machine body is provided with a placement chamber; a first storage tank and a second storage tank are fixedly connected to the inner side wall of the bottom end of the placement chamber; the placement chamber is also provided with a first suction assembly and a second suction assembly; the first suction assembly can transport the test solution in the test chamber to the first storage tank for storage; the second suction assembly can transport the test solution in the test chamber to the second storage tank for storage.

[0006] By adopting the above technical solution, during freeze-thaw tests, a test solution is added to the test chamber, and the concrete specimen is placed inside. The test solution in the test chamber is heated by a heating device. When a freezing test is required, the heated test solution in the test chamber is drawn into a first storage tank by a first suction component. The room-temperature test solution in the second storage tank is then transported to the test chamber by a second suction component. The test solution is then cooled and frozen by a freezing device, completing one freeze-thaw test. When conducting a freeze-thaw test again, the cooled and frozen test solution is drawn into a second storage tank by the second suction component. The heated test solution in the first storage tank is then transported to the test chamber by the first suction component. This reduces the energy consumption of the heating device in heating the test solution to the specified temperature during multiple freeze-thaw tests, and also reduces the energy consumption of the freezing device in cooling the test solution to the specified temperature, thus improving energy utilization.

[0007] Preferably, the first suction assembly includes a first pump body, a first inlet pipe, and a first outlet pipe; the first pump body is disposed on the inner side wall of the bottom end of the placement chamber; one end of the first inlet pipe is fixedly connected to the input end of the first pump body, the first inlet pipe is a three-way pipe, and the two ends of the first inlet pipe away from the first pump body can be respectively connected to the interior of the test chamber and the interior of the first storage tank; one end of the first outlet pipe is fixedly connected to the output end of the first pump body, the first outlet pipe is a three-way pipe, and the two ends of the first outlet pipe away from the first pump body can be respectively connected to the interior of the test chamber and the interior of the first storage tank; two first solenoid valves are provided on the first inlet pipe; two second solenoid valves are provided on the first outlet pipe.

[0008] By adopting the above technical solution, the first solenoid valve and the second solenoid valve are used to open and close the first feed pipe and the first discharge pipe, so that the first pump body can transport the heated solution to the first storage tank for storage, and transport the heated test solution back to the test chamber for testing when needed.

[0009] Preferably, the second suction assembly includes a second pump body, a second inlet pipe, and a second outlet pipe; the second pump body is disposed on the inner wall of the bottom end of the placement chamber; one end of the second inlet pipe is fixedly connected to the input end of the second pump body, the second inlet pipe is a three-way pipe, and the two ends of the second inlet pipe away from the second pump body can be respectively connected to the interior of the test chamber and the second storage tank; one end of the second outlet pipe is fixedly connected to the output end of the second pump body, the second outlet pipe is a three-way pipe, and the two ends of the second outlet pipe away from the second pump body can be respectively connected to the interior of the test chamber and the second storage tank; two third solenoid valves are provided on the second inlet pipe; two fourth solenoid valves are provided on the second outlet pipe.

[0010] By adopting the above technical solution, the third and fourth solenoid valves are used to open and close the second inlet pipe and the second outlet pipe, so that the second pump body can transport the frozen and cooled solution to the second storage tank for storage, and when needed, transport the frozen and cooled test solution back to the test chamber for testing.

[0011] Preferably, a support plate is slidably connected to the inner sidewall of the test chamber; an opening is provided on the support plate; a specimen box is provided on the support plate, extending through the opening to the bottom of the support plate; a baffle plate is fixedly connected to the outer sidewall of the top of the specimen box, which is erected on the top of the support plate; a water inlet is provided on the sidewall of the specimen box; and a driving component is provided in the placement chamber to drive the support plate to slide in the vertical direction.

[0012] By adopting the above technical solution, after the concrete specimen is placed in the specimen box, the drive component moves the support plate downward to immerse the concrete specimen in the test solution so as to conduct a freeze-thaw test on the concrete specimen. After the specimen has completed the test, the drive component moves the support plate upward to remove the concrete specimen from the test solution so that the staff can take out the specimen.

[0013] Preferably, the drive assembly includes a motor and a lead screw; the motor is mounted on the bottom surface of the testing machine body; the lead screw is fixed to the output end of the motor, and the end of the lead screw away from the motor extends into the testing chamber and passes through the support plate; the support plate and the lead screw are threadedly connected.

[0014] By adopting the above technical solution, the starting motor drives the lead screw to rotate. During the rotation of the lead screw, the support plate moves vertically, so that when the support plate moves down, the specimen box can be immersed in the test solution, and when the support plate moves up, the specimen box can be removed from the test solution.

[0015] Preferably, a filter screen is fixed to the inner wall of the water inlet.

[0016] By adopting the above technical solution, the filter screen installed inside the permeable port is used to block debris on the concrete specimen, so that the debris on the concrete specimen is not easily brought into the test chamber with the test solution.

[0017] Preferably, a pad located on one side of the specimen box is fixed to the bottom surface of the support plate; a push block is connected to the side wall of the pad away from the specimen box by a spring; a push rod is fixed to the side wall of the push block near the pad; the end of the push rod away from the push block passes through the pad and extends to the side of the pad away from the push block, and an impact block that can contact the specimen box is fixed to the end of the push rod away from the push block; a pushing mechanism is provided at the bottom of the support plate; the pushing mechanism can drive the push block to drive the impact block to impact the side wall of the specimen box.

[0018] By adopting the above technical solution, when the test specimen box is taken out, the pushing mechanism can drive the push block to move towards the pad. When the push block moves, it drives the impact block to hit the side wall of the test specimen box through the push rod, causing the test specimen box to vibrate, which causes the impurities adhering to the filter screen to fall off, reducing the possibility of the filter screen mesh being blocked.

[0019] Preferably, the support plate has an opening; the push block has an arc surface on the side away from the push rod; the pushing mechanism includes a rack, a rotating shaft, and a magnetic attractor; the rack is slidably connected to the inner wall of the opening, the top end of the rack rests on the top surface of the support plate, and the bottom end of the rack extends to the bottom of the support plate; the rotating shaft is rotatably connected to the bottom surface of the support plate, a gear meshing with the rack is fixedly connected to the outer wall of the rotating shaft near the rack, and a cam that can contact and cooperate with the arc surface is fixedly connected to the outer wall of the rotating shaft near the push block; the magnetic attractor is located at the top of the rack, and the magnetic attractor can cause the specimen box to drive the rack to slide in the vertical direction.

[0020] By adopting the above technical solution, when the test specimen box is lifted out, the test specimen box is driven to move upward by the magnetic suction component. Under the meshing cooperation of the rack and gear, the rotating shaft rotates. During the rotation of the rotating shaft, the cam is driven to reciprocate to squeeze the push block, so that the impact block reciprocates to impact the test specimen box, causing the impurities on the filter screen to fall off. This achieves automatic cleaning of the filter screen when the test specimen box is removed, reducing the trouble of manually cleaning the filter screen.

[0021] Preferably, the magnetic attractor includes an iron sheet and an electromagnet; the iron sheet is fixed to the top of the rack; the electromagnet is fixed to the side wall of the baffle near the iron sheet, and the bottom surface of the electromagnet is in contact with the top surface of the iron sheet.

[0022] By adopting the above technical solution, when the electromagnet is energized, it attracts the iron sheet. When the test box is moved up and taken out, the test box drives the rack to slide up so as to realize the rotation of the rotating shaft. When the test box is moved up to the top of the support plate, the electromagnet is de-energized, the electromagnet loses its attraction effect on the iron sheet, and the rack falls back to the initial position under the action of gravity.

[0023] Preferably, a first insulation board is provided inside the side wall of the first storage tank; and a second insulation board is provided inside the side wall of the second storage tank.

[0024] By adopting the above technical solution, the first insulation plate and the second insulation plate enable the first storage tank and the second storage tank to have good insulation effect and reduce the energy consumption of the test solution in the first storage tank and the second storage tank.

[0025] In summary, this application has the following beneficial effects: 1. When conducting freeze-thaw tests on concrete specimens, the heating device first heats the test solution in the test chamber. When a freezing test is required, the first pump is activated to draw the heated test solution from the test chamber into the first storage tank for storage. The second pump then delivers the room-temperature test solution from the second storage tank into the test chamber. The freezing device then cools and freezes the test solution, completing one freeze-thaw test. When conducting another freeze-thaw test, the second pump draws the cooled and frozen test solution into the second storage tank for storage. The first pump then delivers the heated test solution from the first storage tank into the test chamber for testing. This reduces the energy consumption of the heating device in heating the test solution to the specified temperature during multiple freeze-thaw tests, and also reduces the energy consumption of the freezing device in cooling the test solution to the specified temperature, thus improving energy utilization. 2. By starting the motor and driving the lead screw to rotate, the support plate moves the specimen box down into the test solution. The test solution comes into contact with the concrete specimen in the specimen box after passing through the water inlet, so that the concrete specimen is immersed in the test solution for the freeze-thaw test. After the test is completed, the starting motor drives the lead screw to rotate, so that the support plate moves the specimen box up, so that the specimen box is removed from the test solution for the staff to take out the specimen box. 3. When removing the test specimen box, the pusher is pressed by the pushing mechanism. After being pressed, the pusher compresses the spring and drives the impact block to move towards the side wall of the test specimen box. The impact block hits the side wall of the test specimen box, causing the test specimen box to vibrate. This causes the impurities adhering to the filter screen to be shaken off into the test specimen box, reducing the possibility of the filter screen being blocked. This makes it easier for staff to pour out the impurities in the test specimen box and reduces the trouble of manually cleaning the filter screen. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of a rapid freeze-thaw testing machine for concrete. Figure 2 This is a schematic diagram of the internal structure of the testing machine body in this application; Figure 3 This is a top view of the cavity structure placed in this application; Figure 4 This is a schematic diagram of the mating structure of the support plate and the drive assembly in this application; Figure 5 This is a schematic diagram of the cooperative structure of the specimen box, impact block and pushing mechanism in this application; Figure 6 This is a schematic diagram of the cooperative structure of the pushing mechanism, the pushing block, and the impact block in this application.

[0027] Explanation of reference numerals in the attached drawings: 1. Test machine body; 11. Test chamber; 12. Placement chamber; 13. Support plate; 131. Through port; 132. Opening; 14. Specimen box; 141. Water inlet; 142. Filter screen; 15. Baffle; 16. Drive assembly; 161. Motor; 162. Lead screw; 17. Pad; 171. Spring; 18. Push block; 181. Push rod; 19. Impact block; 2. Freezing device; 3. Heating device; 4. First storage tank; 41. First insulation plate; 5. Second storage tank; 5 1. Second insulation board; 6. First suction assembly; 61. First pump body; 62. First feed pipe; 621. First solenoid valve; 63. First discharge pipe; 631. Second solenoid valve; 7. Second suction assembly; 71. Second pump body; 72. Second feed pipe; 721. Third solenoid valve; 73. Second discharge pipe; 731. Fourth solenoid valve; 8. Pushing mechanism; 81. Rack; 82. Rotating shaft; 821. Gear; 822. Cam; 83. Magnetic suction component; 831. Iron sheet; 832. Electromagnet. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," "lower," "bottom," and "top" used in the following description refer to directions in the drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0029] This invention discloses a rapid freeze-thaw testing machine for concrete, such as... Figure 1 and Figure 2 As shown, the system includes a testing machine body 1, a first storage tank 4, a second storage tank 5, a first suction assembly 6, and a second suction assembly 7. The testing machine body 1 has a testing chamber 11 for holding the solution. A heating device 3 for heating the testing solution and a cooling device 2 for cooling the testing solution are installed on the inner wall of the bottom end of the testing chamber 11. Both the heating device 3 and the cooling device 2 are existing technologies and will not be described in detail here. The testing machine body 1 has a placement chamber 12 located on one side of the testing chamber 11. The first storage tank 4 is fixed to the inner wall of the bottom end of the placement chamber 12, and the second storage tank 5 is fixed to the inner wall of the bottom end of the placement chamber 12. The first suction assembly 6 is located inside the placement chamber 12 and can transport the testing solution between the placement chamber 12 and the first storage tank 4. The second suction assembly 7 is located inside the placement chamber 12 and can transport the testing solution between the placement chamber 12 and the second storage tank 5.

[0030] The concrete specimen is placed in the test chamber 11 containing the test solution. The test solution is heated by the heating device 3 for testing. When a freezing test is required, the first suction assembly 6 draws the heated test solution from the test chamber 11 into the first storage tank 4 for storage. The second suction assembly 7 transports the room-temperature test solution from the second storage tank 5 into the test chamber 11. The freezing device 2 cools and freezes the test solution, completing one freeze-thaw test. When a freeze-thaw test is performed again, the second suction assembly 7 draws the cooled and frozen test solution into the second storage tank 5 for storage. Then, the first suction assembly 6 transports the heated test solution from the first storage tank 4 into the test chamber 11 for testing. This reduces the energy consumption of the heating device 3 in heating the test solution to the specified temperature and the energy consumption of the freezing device 2 in cooling the test solution to the specified temperature during multiple freeze-thaw tests, thus improving energy utilization.

[0031] like Figure 2 and Figure 3 As shown, the first suction assembly 6 includes a first pump body 61, a first inlet pipe 62, and a first outlet pipe 63. Both the first inlet pipe 62 and the first outlet pipe 63 are tee pipes. The first pump body 61 is installed on the inner wall of the bottom end of the placement cavity 12. One end of the first inlet pipe 62 is fixed to the input end of the first pump body 61, and the two ends of the first inlet pipe 62 away from the first pump body 61 are respectively fixed to the inner wall of the placement cavity 12 and the outer wall of the first storage tank 4. The first inlet pipe 62 is connected to the placement cavity 12 and the first storage tank 4. The internal connection is such that the first feed pipe 62 is provided with a first solenoid valve 621 at both ends away from the first pump body 61; one end of the first discharge pipe 63 is fixed to the output end of the first pump body 61, and the two ends of the first discharge pipe 63 away from the first pump body 61 are respectively fixed to the inner side wall of the placement cavity 12 and the outer side wall of the first storage tank 4. The first discharge pipe 63 is connected to the interior of the placement cavity 12 and the first storage tank 4, and a second solenoid valve 631 is provided at both ends of the first discharge pipe 63 away from the first pump body 61.

[0032] The first inlet pipe 62 and the first outlet pipe 63 are opened and closed by the cooperation of the first solenoid valve 621 and the second solenoid valve 631, so that the first pump body 61 can draw the test solution and promote the test solution to be transported between the placement chamber 12 and the first storage tank 4. This facilitates the transport of the test solution to the first storage tank 4 for storage and the return of it to the test chamber 11 for testing when needed.

[0033] like Figure 2 and Figure 3As shown, the second suction assembly 7 includes a second pump body 71, a second inlet pipe 72, and a second outlet pipe 73. Both the second inlet pipe 72 and the second outlet pipe 73 are tee pipes. The second pump body 71 is installed on the inner wall of the bottom end of the placement cavity 12. One end of the second inlet pipe 72 is fixed to the input end of the first pump body 61, and the two ends of the second inlet pipe 72 away from the second pump body 71 are respectively fixed to the inner wall of the placement cavity 12 and the outer wall of the second storage tank 5. The second inlet pipe 72 is connected to the placement cavity 12 and the second storage tank 5. The second feed pipe 72 is internally connected, and a third solenoid valve 721 is provided at both ends away from the second pump body 71. One end of the second discharge pipe 73 is fixed to the output end of the second pump body 71, and the two ends of the second discharge pipe 73 away from the second pump body 71 are respectively fixed to the inner side wall of the placement cavity 12 and the outer side wall of the second storage tank 5. The second discharge pipe 73 is internally connected to the placement cavity 12 and the second storage tank 5. A fourth solenoid valve 731 is provided at both ends of the second discharge pipe 73 away from the second pump body 71.

[0034] The second feed pipe 72 and the second discharge pipe 73 are opened and closed by the cooperation of the third solenoid valve 721 and the fourth solenoid valve 731, so that the second pump body 71 can draw the test solution and promote the test solution to be transported between the placement chamber 12 and the second storage tank 5. This facilitates the transport of the test solution to the second storage tank 5 for storage and the return of it to the test chamber 11 for testing when needed.

[0035] like Figure 2 As shown, a first insulation board 41 is provided inside the side wall of the first storage tank 4, and a second insulation board 51 is provided inside the side wall of the second storage tank 5. Both the first insulation board 41 and the second insulation board 51 are made of polyurethane foam.

[0036] The arrangement of the first insulation plate 41 and the second insulation plate 51 ensures that both the first storage tank 4 and the second storage tank 5 have good insulation effects, reducing the energy consumption of the test solution when the first storage tank 4 and the second storage tank 5 store the test solution.

[0037] like Figure 2 and Figure 4As shown, a support plate 13 is slidably connected to the inner wall of the test chamber 11. A drive assembly 16 is provided at the bottom of the support plate 13 to drive it to slide vertically. The drive assembly 16 includes a motor 161 and a lead screw 162. The motor 161 is mounted on the bottom surface of the test machine body 1 and is a brake motor 161. The lead screw 162 is coaxially fixed to the output end of the motor 161. The end of the lead screw 162 away from the motor 161 extends vertically through the support plate 13 into the placement chamber 12. The support plate 13 and the lead screw 162... 2. Threaded transmission fit; The support plate 13 is provided with multiple openings 131, and each of the multiple openings 131 is provided with a specimen box 14 that slides with the inner side wall of the opening 131. A baffle 15 is fixed to the outer side wall of the top of the specimen box 14 and is mounted on the top of the support plate 13. The bottom of the specimen box 14 extends to the bottom of the support plate 13. The specimen box 14 is rectangular. Multiple water inlets 141 are provided on the two side walls of the specimen box 14 that are far apart from each other. A filter screen 142 is fixed to the inner side wall of the water inlet 141. A handle is fixed to the top surface of the baffle 15.

[0038] The concrete specimen is placed in the specimen box 14. The motor 161 is started to drive the lead screw 162 to rotate, causing the support plate 13 to move the specimen box 14 down into the test solution. The test solution comes into contact with the concrete specimen in the specimen box 14 after passing through the permeable port 141, so that the concrete specimen is immersed in the test solution for the freeze-thaw test. After the test is completed, the motor 161 is started to drive the lead screw 162 to rotate, causing the support plate 13 to move the specimen box 14 up, so that the specimen box 14 is removed from the test solution for the staff to take out the specimen box 14. The filter screen 142 is set to block impurities on the concrete specimen, so that impurities are not easy to enter the test chamber 11 through the port 131.

[0039] like Figure 5 and Figure 6 As shown, the test specimen box 14 is provided with a pad 17 on the side near the filter screen 142, which is located outside the test specimen box 14. The pad 17 is fixed to the bottom surface of the support plate 13. A push block 18 is connected to the side wall of the pad 17 away from the test specimen box 14 by a spring 171. A push rod 181 is fixed to the side wall of the push block 18 near the pad 17, which extends through the pad 17 to the side of the pad 17 away from the spring 171. An impact block 19 that can contact the test specimen box 14 is fixed to the end of the push rod 18 away from the push block 18. A pushing mechanism 8 is provided on the side of the push block 18 away from the spring 171. The pushing mechanism 8 can squeeze the push block 18 to push the impact block 19 to impact the side wall of the test specimen box 14.

[0040] When the test specimen box 14 is removed, the pushing mechanism 8 squeezes the push block 18. After the push block 18 is compressed, the spring 171 is compressed and the push rod 181 drives the impact block 19 to move towards the side wall of the test specimen box 14. This causes the impact block 19 to hit the side wall of the test specimen box 14, causing the test specimen box 14 to vibrate. This causes the impurities adhering to the filter screen 142 to be shaken off into the test specimen box 14, reducing the possibility of the mesh of the filter screen 142 being blocked. This makes it easier for the staff to pour out the impurities in the test specimen box 14 and reduces the trouble of manually cleaning the filter screen 142.

[0041] like Figure 4 , Figure 5 and Figure 6 As shown, the support plate 13 has openings 132 on the top surface of the push block 18 away from the spring 171. The push block 18 has an arc surface on the side away from the push rod 181. The pushing mechanism 8 includes a rack 81, a rotating shaft 82, and a magnetic attractor 83. The rack 81 is slidably connected to the inner wall of the opening 132, and the bottom end of the rack 81 extends to the bottom of the support plate 13. The rotating shaft 82 is rotatably connected to the bottom surface of the support plate 13. The rotating shaft 82 is located on the side of the rack 81 closer to the push block 18. The outer wall of the rotating shaft 82 near the rack 81 is fixedly connected to the rack 81. The meshing gear 821, the rotating shaft 82 near the side wall of the push block 18, the cam 822 that can contact and cooperate with the arc surface, the magnetic suction component 83 is set at the top of the rack 81, the magnetic suction component 83 can make the test box 14 drive the rack 81 to slide in the vertical direction, the magnetic suction component 83 includes an iron sheet 831 and an electromagnet 832, the iron sheet 831 is fixed to the top of the rack 81, the iron sheet 831 is placed on the top surface of the support plate 13, the electromagnet 832 is fixed to the side wall of the baffle 15 near the iron sheet 831, the bottom surface of the electromagnet 832 is in contact with the top surface of the iron sheet 831.

[0042] When electromagnet 832 is energized, it attracts iron sheet 831. When the operator moves the test box 14 upwards, rack 81 moves upwards with the test box 14, driving gear 821 and rotating shaft 82 to rotate. During the rotation of rotating shaft 82, cam 822 contacts the arc surface on push block 18 and squeezes push block 18, causing push block 18 to push impact block 19 to impact the side wall of test box 14. During the process of cam 822 squeezing push block 18 multiple times, impact block 19 impacts test box 14 multiple times, causing impurities on filter screen 142 to fall off, thus cleaning filter screen 142. When test box 14 moves to a position where it is no longer in contact with impact block 19, electromagnet 832 is de-energized, causing electromagnet 832 to lose its attraction to iron sheet 831. Rack 81 falls back and separates from test box 14 under gravity, so that test box 14 can be removed.

[0043] Working principle: During the freeze-thaw test of concrete specimens, the concrete specimen is placed in the specimen box 14. The motor 161 is started, driving the lead screw 162 to rotate, causing the support plate 13 to move the specimen box 14 downward, immersing the concrete specimen in the test solution. The test solution in the test chamber 11 is heated by the heating device 3 for the test. When a freezing test is required, the first pump 61 is started to draw the heated test solution in the test chamber 11 into the first storage tank 4 for storage. The second pump 71 delivers the room-temperature test solution from the second storage tank 5 to the test chamber. Inside chamber 11, the test solution is cooled and frozen by the freezing device 2 to complete one freeze-thaw test. When the freeze-thaw test is carried out again, the second pump 71 draws the cooled and frozen test solution into the second storage tank 5 for storage, and then the first pump 61 transports the heated test solution in the first storage tank 4 to the test chamber 11 for testing. This reduces the energy consumption of the heating device 3 in heating the test solution to the specified temperature during multiple freeze-thaw tests, and also reduces the energy consumption of the freezing device 2 in cooling the test solution to the specified temperature, thereby improving energy utilization. After the concrete specimen completes the freeze-thaw test, the motor 161 is started, driving the lead screw 162 to rotate. This causes the support plate 13 to move the specimen box 14 upwards, removing it from the test solution for easy removal. When the worker removes the specimen box 14, the electromagnet 832 is energized, causing the specimen box 14 to move upwards, driving the rack 81 upwards. Under the meshing of the rack 81 and gear 821, the rotating shaft 82 drives the cam 822 to rotate. During the rotation of the cam 822, it interacts with the arc surface on the push block 18. Contacting and squeezing the pusher 18 causes it to push the impact block 19 to impact the side wall of the test specimen box 14, causing the test specimen box 14 to vibrate. This causes the impurities adhering to the filter screen 142 to fall off, making it easier to pour out the impurities that have fallen into the test specimen box 14 and reducing the trouble of manually cleaning the filter screen 142. When the test specimen box 14 is moved to the top of the support plate 13, the electromagnet 832 is de-energized, and the electromagnet 832 loses its attraction effect on the iron sheet 831. The rack 81 falls back to its initial position under the action of gravity.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rapid freeze-thaw testing machine for concrete, characterized in that: The test machine includes a main body (1); the main body (1) is provided with a test chamber (11) for holding the test solution; the test chamber (11) is provided with a freezing device (2) and a heating device (3) for performing freeze-thaw operations on the test solution; the main body (1) is provided with a placement chamber (12); a first storage tank (4) and a second storage tank (5) are fixedly connected to the inner side wall of the bottom end of the placement chamber (12); the placement chamber (12) is also provided with a first suction assembly (6) and a second suction assembly (7); the first suction assembly (6) can transport the test solution in the test chamber (11) to the first storage tank (4) for storage; the second suction assembly (7) can transport the test solution in the test chamber (11) to the second storage tank (5) for storage.

2. The concrete rapid freeze-thaw testing machine according to claim 1, characterized in that: The first suction assembly (6) includes a first pump body (61), a first feed pipe (62), and a first discharge pipe (63); the first pump body (61) is disposed on the inner side wall of the bottom end of the placement cavity (12); one end of the first feed pipe (62) is fixed to the input end of the first pump body (61), the first feed pipe (62) is a three-way pipe, and the two ends of the first feed pipe (62) away from the first pump body (61) can be connected to the inside of the test cavity (11) and the first storage tank (4) respectively; one end of the first discharge pipe (63) is fixed to the output end of the first pump body (61), the first discharge pipe (63) is a three-way pipe, and the two ends of the first discharge pipe (63) away from the first pump body (61) can be connected to the inside of the test cavity (11) and the first storage tank (4) respectively; two first solenoid valves (621) are provided on the first feed pipe (62); two second solenoid valves (631) are provided on the first discharge pipe (63).

3. The concrete rapid freeze-thaw testing machine according to claim 1, characterized in that: The second suction assembly (7) includes a second pump body (71), a second feed pipe (72), and a second discharge pipe (73); the second pump body (71) is disposed on the inner side wall of the bottom end of the placement cavity (12); one end of the second feed pipe (72) is fixed to the input end of the second pump body (71), the second feed pipe (72) is a three-way pipe, and the two ends of the second feed pipe (72) away from the second pump body (71) can be connected to the interior of the test cavity (11) and the second storage tank (5) respectively; one end of the second discharge pipe (73) is fixed to the output end of the second pump body (71), the second discharge pipe (73) is a three-way pipe, and the two ends of the second discharge pipe (73) away from the second pump body (71) can be connected to the interior of the test cavity (11) and the second storage tank (5) respectively; two third solenoid valves (721) are provided on the second feed pipe (72); two fourth solenoid valves (731) are provided on the second discharge pipe (73).

4. The concrete rapid freeze-thaw testing machine according to claim 1, characterized in that: A support plate (13) is slidably connected to the inner wall of the test chamber (11); a through-hole (131) is provided on the support plate (13); a specimen box (14) is provided on the support plate (13) and extends through the through-hole (131) to the bottom of the support plate (13); a baffle (15) is fixedly connected to the outer wall of the top of the specimen box (14) and is erected on the top of the support plate (13); a water inlet (141) is provided on the side wall of the specimen box (14); a driving component (16) is provided in the placement chamber (12) to drive the support plate (13) to slide in the vertical direction.

5. A rapid freeze-thaw testing machine for concrete according to claim 4, characterized in that: The drive assembly (16) includes a motor (161) and a lead screw (162); the motor (161) is mounted on the bottom surface of the test machine body (1); the lead screw (162) is fixed to the output end of the motor (161), and the end of the lead screw (162) away from the motor (161) extends into the test chamber (11) and passes through the support plate (13); the support plate (13) and the lead screw (162) are threadedly connected.

6. A rapid freeze-thaw testing machine for concrete according to claim 4, characterized in that: A filter screen (142) is fixed to the inner wall of the water inlet (141).

7. A rapid freeze-thaw testing machine for concrete according to claim 4, characterized in that: The bottom surface of the support plate (13) is fixedly connected to a pad (17) located on one side of the specimen box (14); a push block (18) is connected to the side wall of the pad (17) away from the specimen box (14) by a spring (171); a push rod (181) is fixedly connected to the side wall of the push block (18) near the pad (17); the end of the push rod (181) away from the push block (18) passes through the pad (17) and extends to the side of the pad (17) away from the push block (18), and an impact block (19) that can contact the specimen box (14) is fixedly connected to the end of the push rod (181) away from the push block (18); a pushing mechanism (8) is provided at the bottom of the support plate (13); the pushing mechanism (8) can drive the push block (18) to drive the impact block (19) to impact the side wall of the specimen box (14).

8. A rapid freeze-thaw testing machine for concrete according to claim 7, characterized in that; The support plate (13) is provided with an opening (132); the push block (18) has an arc surface on the side away from the push rod (181); the pushing mechanism (8) includes a rack (81), a rotating shaft (82), and a magnetic suction element (83); the rack (81) is slidably connected to the inner wall of the opening (132), the top end of the rack (81) rests on the top surface of the support plate (13), and the bottom end of the rack (81) extends to the bottom of the support plate (13); the rotating shaft (82) Rotatably connected to the bottom surface of the support plate (13), the rotating shaft (82) is fixedly connected to the outer side wall of the rack (81) with a gear (821) meshing with the rack (81), and the rotating shaft (82) is fixedly connected to the outer side wall of the push block (18) with a cam (822) that can contact and cooperate with the arc surface; the magnetic suction element (83) is set at the top of the rack (81), and the magnetic suction element (83) can make the test box (14) drive the rack (81) to slide in the vertical direction.

9. A rapid freeze-thaw testing machine for concrete according to claim 8, characterized in that: The magnetic attractor (83) includes an iron sheet (831) and an electromagnet (832); the iron sheet (831) is fixed to the top of the rack (81); the electromagnet (832) is fixed to the side wall of the baffle (15) near the iron sheet (831), and the bottom surface of the electromagnet (832) is in contact with the top surface of the iron sheet (831).

10. A rapid freeze-thaw testing machine for concrete according to claim 1, characterized in that: The first storage tank (4) has a first insulation board (41) inside its side wall; the second storage tank (5) has a second insulation board (51) inside its side wall.

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