A highway aggregate solidity cycle test apparatus

Abstract

The utility model discloses a kind of highway aggregate solidity cycle test equipment, it includes box body, thermostatic water tank, drying device, lifting device, solution tank, suspension plate and more than one net basket for loading aggregate, the lower part of box body is equipped with water tank accommodating cavity, thermostatic water tank is slidably installed in water tank accommodating cavity, thermostatic water tank can be pulled out from water tank accommodating cavity, solution tank is placed in thermostatic water tank, the middle part of box body is equipped with drying chamber, the lower surface of drying chamber is open, and heat insulation bottom plate that can be opened and closed by first power drive is equipped at opening, drying chamber will be communicated with water tank accommodating cavity upside-down when opening heat insulation bottom plate, drying device is arranged in drying chamber, suspension plate is installed in box body by lifting device, lifting device can drive suspension plate to lift between drying chamber and solution tank, the lower surface of suspension plate is equipped with more than one hook, more than one net basket can be hung by hook.The utility model can save a lot of manual operation, improve test efficiency.

Description

Technical Field

[0001] This utility model belongs to aggregate testing technology, specifically relating to a cyclic testing device for the robustness of highway aggregates. Background Technology

[0002] Aggregates are granular materials that serve as the skeleton and filler in mixtures such as concrete and asphalt. They can be classified into coarse and fine aggregates according to particle size, including crushed stone, sand, and stone chips. Aggregate soundness refers to the property of aggregates to withstand repeated soaking and drying in saturated sodium sulfate or magnesium sulfate solutions without significant damage or strength reduction. It is an important indicator describing the aggregate's resistance to environmental effects such as temperature changes and humidity fluctuations. All other parameters being equal, a higher soundness value generally indicates a weaker ability of the aggregate to resist environmental effects. This indicator was originally proposed to control the quality of natural aggregates, and now national and industry standards set requirements and limits for the soundness of all aggregates.

[0003] The typical procedure for aggregate soundness testing is as follows: First, the sample particles are cleaned in water to remove surface impurities, then placed in an electric heating drying oven and dried to constant weight at a set temperature. Next, the sample particles are sieved using a dry sieve method to separate particle sizes. Each particle size is weighed according to the mass requirements of each particle size in the aggregate soundness test. The aggregate particles to be tested are immersed in a saturated sodium sulfate solution at 21°C for 20 hours, then removed and air-dried for 15 minutes. They are then placed in an electric heating drying oven and dried at 105°C for 4 hours. After cooling to 21°C, the process of immersion in the saturated sodium sulfate solution and drying in the drying oven is repeated. This cycle is repeated 5 times. Finally, the sample aggregate particles are immersed in water at 46-49°C to remove crystalline sulfate, and then dried in a drying oven to constant weight. The mass loss rate and weighted mass loss rate of each aggregate size are calculated by measuring the sieve residue mass, the pre-test drying mass, and the post-test drying mass of each aggregate size.

[0004] However, the use of existing aggregate soundness testing instruments has the following problems:

[0005] (1) The water tank and the solution tank are fixed. During the test or after the test, the rotary water valve switch on the drain pipe below needs to be opened to discharge the water or sodium sulfate saturated solution out of the test chamber. Since sodium sulfate saturated solution is easy to crystallize, it will block the drain pipe.

[0006] (2) If experiments need to be conducted in different solutions, the solutions must be changed. When changing solutions, one test solution must be completely drained and thoroughly cleaned before another solution can be added, making the solution changing efficiency very low. Since the solution tank cannot be replaced, it is difficult to guarantee that there are no solution residues after cleaning, and these residues may affect the test results.

[0007] (3) The current aggregate soundness testing instruments have a small internal space, which can only meet the requirement of one set of aggregates to be tested in one machine. If multiple sets of aggregates are to be compared in the same solution, multiple testing instruments are required at the same time, which not only wastes resources, but also makes it easier to produce test errors when using different testing instruments.

[0008] (4) The aggregate needs to be soaked in solution, dried, dried in drying oven and cooled five times during the test. It is necessary to manually switch the sample particles back and forth between the aggregate strength test instrument and the drying oven. During this period, it is necessary to switch back and forth 10 times and move the sample 20 times. The labor cost and time cost are large, the efficiency is low, and it will affect the accuracy of the test results.

[0009] Therefore, this utility model addresses the above problems by designing a cyclic testing device for the soundness of highway aggregates, which reduces workload and greatly improves testing efficiency. Utility Model Content

[0010] The purpose of this invention is to provide a cyclic testing device for the robustness of highway aggregates.

[0011] The objective of this utility model is achieved through the following technical solution:

[0012] A cyclic testing device for the robustness of highway aggregates, characterized in that it comprises a box body, a constant temperature water tank, a drying device, a lifting device, a solution tank, a suspension plate, and one or more baskets for holding aggregates. The lower part of the box body has a water tank receiving cavity, the constant temperature water tank is slidably installed within the water tank receiving cavity, and the constant temperature water tank can be pulled out from the water tank receiving cavity. The solution tank is placed inside the constant temperature water tank. A drying chamber is located in the middle of the box body, with an opening at the bottom. An insulated bottom plate, which can be opened and closed by a first power source, is located at the opening. When the insulated bottom plate is opened, the drying chamber is vertically connected to the water tank receiving cavity. The drying device is located inside the drying chamber. The suspension plate is installed inside the box body via the lifting device, which can move the suspension plate up and down between the drying chamber and the solution tank. One or more hooks are located below the suspension plate, through which one or more baskets can be suspended.

[0013] A further technical solution of this utility model is: a support is provided at the bottom of the constant temperature water tank, and the solution tank is placed on the support.

[0014] A further technical solution of this utility model is as follows: the constant temperature water tank is provided with a cooling pipe, a circulating water pump and a heating pipe. The circulating water pump and the heating pipe are both located on the inner side of the support, and the cooling pipe is located on the inner wall of the constant temperature water tank.

[0015] A further technical solution of this utility model is: the highway aggregate robustness cycle test equipment is also equipped with a probe placed in a solution tank for detecting the temperature and density of the solution.

[0016] A further technical solution of this utility model is as follows: the drying device includes a first fan and a heating wire. The heating wire is installed inside the drying chamber and can heat the drying chamber. The first fan is installed on the back plate of the drying chamber, and the back plate of the drying chamber is provided with an air outlet that connects the inner and outer spaces.

[0017] A further technical solution of this utility model is as follows: the lifting device includes a second power source, second traction ropes respectively arranged at the four corners of the corresponding suspension plate, and second fixed pulleys arranged one-to-one with the second traction ropes. The second power source and the second fixed pulleys are located on the upper part of the box body. The position of the second fixed pulleys corresponds to the position of the four corners of the suspension plate. The second traction ropes pass over the second fixed pulleys. One end of the second traction rope is connected to the second power source, and the other end is connected to the suspension plate.

[0018] A further technical solution of this utility model is: the front of the cabinet body is provided with an upper cabinet door and a lower cabinet door respectively, corresponding to the positions of the drying chamber and the water tank receiving chamber.

[0019] A further technical solution of this utility model is: the drying chamber is enclosed by a heat insulation plate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) This utility model integrates a drying chamber with a drying device and a solution tank placed in a constant temperature water tank. When the heat insulation bottom plate under the drying chamber is opened, the lifting device can drive the hanging plate to move up and down between the drying chamber and the solution tank, thereby quickly switching the aggregate suspended on the hanging plate between the drying chamber and the solution tank. The testing process no longer needs to rely on manual transfer, saving a lot of manual operation and improving testing efficiency.

[0022] (2) The solution tank of this invention is no longer fixed, but is placed directly in the constant temperature water tank. By pulling the constant temperature water tank out of the water tank's containment cavity, the solution tank containing different solutions can be directly replaced without the need for cumbersome solution discharge, thus improving testing efficiency. At the same time, this invention can also select a solution tank of appropriate size according to the amount of aggregate used for testing, thereby reducing testing costs.

[0023] (3) The cyclic testing equipment of this utility model is simple to operate and easy to learn, and does not require special training. Attached Figure Description

[0024] Figure 1 This is a front view schematic diagram of the cyclic testing device according to an embodiment of the present utility model;

[0025] Figure 2 This is a side view of the cyclic testing device according to an embodiment of the present invention;

[0026] Figure 3 yes Figure 2 Schematic diagram of the cross section at point BB;

[0027] Figure 4 yes Figure 1 Schematic diagram of the cross section at point AA;

[0028] Figure 5 This is a schematic diagram of the structure of the suspension plate according to an embodiment of the present utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the constant temperature water tank and solution tank according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the cyclic testing equipment according to an embodiment of the present invention when the suspension plate is located in the drying chamber during the test;

[0031] Figure 8 This is a schematic diagram of the structure of the cyclic testing equipment according to an embodiment of the present invention when the suspension plate is located in the solution tank during the test;

[0032] Figure 9 This is a flowchart illustrating the operation of the cyclic testing device according to an embodiment of the present invention.

[0033] Meaning of the labels in the attached diagram:

[0034] 1a-Upper cabinet door; 1b-Lower cabinet door; 2-Handle; 3a-First control panel; 3b-Second control panel; 4-Steel support; 5-Box body; 6a-First fan; 6b-Second fan; 7a-First motor; 7b-Second motor; 8-Hanging plate; 9-Drying chamber; 10-Heating wire; 11-Insulated base plate; 12-Constant temperature water tank; 13a-First fixed pulley; 13b-Second fixed pulley; 14-Air outlet; 15-Metal frame; 16-Rotating shaft; 17-Detector head; 18-Slide rail assembly; 19-Insulation plate; 20-Bracket; 21-Heating tube; 22-Solution tank; 23-Refrigeration tube; 24-Hook; 25-Wire basket; 26a-First traction rope; 26b-Second traction rope; 27-Circulating water pump. Detailed Implementation

[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments, so that those skilled in the art can better understand and implement the design scheme of this utility model.

[0036] This embodiment provides, for example Figure 1-7 The highway aggregate robustness cyclic testing equipment shown includes a box body 5, a constant temperature water tank 12, a drying device, a lifting device, a solution tank 22, a suspension plate 8, and multiple baskets 25 for loading aggregates.

[0037] like Figure 1 and Figure 2 As shown, the box body 5 is a closed box-shaped structure. To improve the overall stability of the structure, the box body 5 is composed of a metal frame 15 on all sides and inside the top, and is covered with a stainless steel shell. The front of the box body 5 has an upper cabinet door 1a and a lower cabinet door 1b, each with a handle 2. A steel support 4 is installed at the bottom of the box body 5.

[0038] like Figure 3 and Figure 4 As shown, the cabinet body 5 has three parts: upper, middle, and lower. The lower part of the cabinet body 5 has a water tank receiving cavity, the front of which is the lower cabinet door 1b, and the upper part of the water tank receiving cavity is not closed. The constant temperature water tank 12 is installed in the water tank receiving cavity via two slide rail assemblies 18. The slide rail assemblies 18 connect the bottom sides of the constant temperature water tank 12 to the inner wall of the water tank receiving cavity. By opening the lower cabinet door 1b, the constant temperature water tank 12 can be slidably pulled out of the water tank receiving cavity. The sliding installation of the constant temperature water tank 12 is similar to a drawer structure, and the slide rail assembly 18 is a conventional accessory used for sliding installation.

[0039] In this embodiment, the constant temperature water tank 12 is equipped with a support 20, a cooling pipe 23, a circulating water pump 27, and a heating pipe 21. The support 20 is located at the bottom of the constant temperature water tank 12, and the solution tank 22 is placed inside the constant temperature water tank 12 and sits on top of the support 20. The support 20 prevents the bottom of the solution tank 22 from directly contacting the bottom surface of the constant temperature water tank 12. The circulating water pump 27 and the heating pipe 21 are both located inside the support 20, and the cooling pipe 23 is located on the inner wall of the constant temperature water tank 12. In use, the constant temperature water tank 12 will be filled with water. The circulating water pump 27 is used to circulate the water in the constant temperature water tank 12, making the water temperature in the constant temperature water tank 12 more uniform. The heating pipe 21 and the cooling pipe 23 are used to heat and cool the water in the constant temperature water tank 12, respectively, thereby achieving the heating and cooling of the solution in the solution tank 22.

[0040] In this embodiment, a probe 17 is provided at the lower part of the tank body 5. The probe 17 is placed inside the solution tank 22 to detect the temperature and density of the solution inside the solution tank 22. The purpose of density detection is to ensure that the solution density is within the specified range. When replacing the solution tank 22, the probe 17 can be manually removed from the solution tank 22 and then placed back into the new solution tank 22 after replacement.

[0041] A drying chamber 9 is located in the middle of the casing 5, and the front of the drying chamber 9 is an upper cabinet door 1a. The top and sides of the drying chamber 9 are enclosed by heat insulation panels 19. The bottom of the drying chamber 9 is open, and an insulated bottom plate 11 that can be opened and closed is provided at the opening. The opening and closing of the insulated bottom plate 11 is driven by a first power. When the insulated bottom plate 11 is opened, the drying chamber 9 will be vertically connected to the water tank cavity. Figure 8 The image shows the state when the heat insulation base plate 11 is open. Figure 7 The image shows the state when the heat insulation base plate 11 is closed.

[0042] In this embodiment, heat-insulating base plates 11 are installed on both sides of the opening via rotating shafts 16. The heat-insulating base plates 11 can rotate around the rotating shafts 16. The first power source includes a first motor 7a, which is installed in the upper space of the housing 5. The structure for driving the heat-insulating base plates 11 to open and close via the first motor 7a adopts an existing transmission structure. In this embodiment, the transmission is specifically achieved using a first traction rope 26a. The heat-insulating base plates 11 are usually kept in a horizontal closed state by springs. At the upper part of the housing 5, corresponding to the two ends of the two rotating shafts 16, there are first fixed pulleys 13a, and four pulleys 13a are installed. The first traction rope 26a is positioned at both ends of the two rotating shafts 16. The first traction rope 26a passes over the first fixed pulley 13a. One end of the first traction rope 26a is wound around a reel on the output shaft of the first motor 7a, and the other end is wound around the rotating shaft 16. When the first motor 7a starts and winds up the first traction rope 26a, it pulls the rotating shaft 16 to rotate, causing the heat-insulating base plate 11 to flip upwards and open. As the first motor 7a continuously releases the first traction rope 26a, the rotating shaft 16 will reset under the action of a spring, ultimately causing the heat-insulating base plate 11 to close again. Since the above structure, which uses the first traction rope 26a to open and close the heat-insulating base plate 11, is a conventional structure, it will not be described in detail here.

[0043] Of course, in other embodiments, the first motor 7a can also drive the heat insulation base plate through other transmission structures, such as: the first motor 7a drives the rotating shaft 16 to rotate through a worm gear structure; the first motor 7a drives the rotating shaft 16 to rotate through a transmission belt and pulley structure, etc.

[0044] The hanging plate 8 is installed inside the box body 5 via a lifting device. When the heat insulation bottom plate 11 under the drying chamber 9 is opened, the hanging plate 8 can be lifted and lowered between the drying chamber 9 and the solution tank 22 via the lifting device, thereby quickly switching the aggregate suspended on the hanging plate 8 between the drying chamber 9 and the solution tank 22.

[0045] The lifting device in this embodiment includes a second power source, second traction ropes 26b respectively arranged at the four corners of the suspension plate 8, and second fixed pulleys 13b corresponding to the second traction ropes 26b. The second power source is specifically a second motor 7b. The second motor 7b and the second fixed pulleys 13b are located in the upper space of the housing 5. The positions of the second fixed pulleys 13b correspond to the four corner positions of the suspension plate 8. The second traction ropes 26b pass over the second fixed pulleys 13b. One end of the second traction rope 26b is wound around a reel on the output shaft of the second motor 7b, and the other end is fixedly connected to the suspension plate 8, so that the suspension plate 8 is in a horizontal suspended state. In use, the second traction ropes 26b are wound up and released by rotating the reel driven by the second motor 7b, thereby realizing the lifting and lowering of the suspension plate 8.

[0046] like Figure 5 As shown, the suspension plate 8 in this embodiment has multiple through holes arranged in a matrix, and multiple hooks 24 arranged in a matrix are provided below the suspension plate 8. One or more wire baskets 25 can be suspended as needed through the hooks 24. The wire basket 25 in this embodiment is a triangular wire basket.

[0047] The drying device is located inside the drying chamber 9 and is used to heat the drying chamber 9 to dry the sample. In this embodiment, the drying device includes a first fan 6a and heating wires 10. Heating wires 10 are respectively provided on two opposite inner sides of the drying chamber 9, which heat the interior of the drying chamber 9. The first fan 6a is installed in the mounting hole on the back plate of the drying chamber 9, and can draw in outside air and blow it into the drying chamber 9. Simultaneously, an air outlet 14 connecting the inner and outer spaces is provided on the upper part of the back plate of the drying chamber 9.

[0048] In this embodiment, a second fan 6b is provided on the upper part of the housing 5.

[0049] In this embodiment, a first control panel 3a and a second control panel 3b can be further installed on the upper cabinet door 1a and the lower cabinet door 1b, respectively. The first motor 7a, the second motor 7b, the first fan 6a, and the heating wire 10 are all wired to the first control panel 3a. The first control panel 3a controls the forward and reverse rotation of the first motor 7a and the second motor 7b, thereby achieving the flipping of the heat-insulating base plate 11 and the raising and lowering of the hanging plate 8. The first control panel 3a also controls the start and stop of the first fan 6a and the heating wire 10 to achieve the drying of the aggregate. The probe head 17, the cooling pipe 23, and the heating pipe 21 are wired to the second control panel 3b. The second control panel 3b controls the cooling pipe 23 and the heating pipe 21 to maintain the solution in the solution tank 22 at a set temperature.

[0050] like Figure 9 As shown, the specific workflow of the cyclic testing equipment in this embodiment is as follows:

[0051] Step 1: Select the appropriate model of mesh basket 25 according to the aggregate particle size, load the aggregate particles to be tested into the appropriate model of mesh basket 25, then suspend the mesh basket 25 on the hook 24 below the hanging plate 8, and close the upper cabinet door 1a.

[0052] Step 2: Select the appropriate saturated solution according to the test plan, add the solution to the solution tank 22, open the lower cabinet door 1b, pull the constant temperature water tank 12 out of the water tank cavity, put the solution tank 22 containing the corresponding solution into the constant temperature water tank 12, add water to the constant temperature water tank 12, the liquid level in the constant temperature water tank 12 is slightly higher than the liquid level in the solution tank 22, push the constant temperature water tank 12 into the water tank cavity, and close the lower cabinet door 1b;

[0053] Step 3: Start the cycle test equipment for testing. First, the aggregate soaking stage is carried out. At this time, the drying device stops working. The heat insulation base plate 11 is opened by the first motor 7a, and the suspension plate 8 is lowered into the solution tank 22 by the second motor 7b. At this time, the aggregate is completely immersed below the liquid surface in the solution tank 22. During the immersion, it is raised and lowered slightly 25 times to remove air bubbles. During the small up and down movement, the aggregate particles do not protrude from the liquid surface. Then, it is left to stand in the solution in the solution tank 22 for 20 hours. During this period, the solution temperature is maintained at 21℃. After 20 hours of standing and soaking, the soaking stage is completed.

[0054] Step 5: Then proceed with the aggregate drying process. The second motor 7b drives the suspension plate 8 to rise to the middle position of the drying chamber 9. At this time, the mesh basket 25 has completely entered the drying chamber 9. The first motor 7a closes the heat insulation base plate 11. After standing for 15 minutes, the heating wire 10 starts heating and dries for 4 hours at 105℃. After that, the heating wire 10 is turned off, the fan is turned on, and it is left to stand for 2.5 hours. The first soaking and drying test cycle is completed.

[0055] Step 6: Repeat the cycle process according to Steps 4 and 5, except that the soaking time is different from the first cycle. The soaking time is adjusted to 4 hours. When the fifth cycle is completed, the cyclic soaking stage of this experiment ends. Take out the aggregate, wash it with 46℃ clean water and dry it to constant weight. Weigh the mass after drying and calculate it. The experiment is completed.

[0056] During the experiment, the drying environment and the soaking environment are switched by a lifting device. When the lifting device rises or falls, the heat-insulating base plate 11 opens or closes under the drive of the first power. The second control panel 3b can display the density of the solution in real time to determine whether the solution is saturated.

[0057] The following are actual examples of tests conducted using the cyclic testing equipment described in this embodiment:

[0058] Case 1: Soundness test of fine aggregate in sodium sulfate saturated solution

[0059] Select the appropriate model of mesh basket 25 according to the particle size specification of the fine aggregate, and hang the mesh baskets 25 on the hooks of the hanging plate 8, with a distance of not less than 20mm between the mesh baskets 25. The first control panel 3a can be used to set the number of cycles, drying time, soaking time, drying temperature, and the number of times the lifting device can move. Following step 2 above, place the solution tank 22 containing the prepared saturated sodium sulfate solution into the constant temperature water tank 12. The solution temperature can be set through the second control panel 3b, and the saturation state of the solution can be observed in real time. After setup, the experiment begins. The lifting device first lowers the suspension plate 8, immersing the basket 25 completely in the sodium sulfate saturated solution in the solution tank 22. During immersion, the basket is raised and lowered slightly 25 times to remove air bubbles, ensuring the aggregate particles do not protrude from the liquid surface. The basket is then left to stand in the solution for 20 hours, maintaining the solution temperature at 21°C. After 20 hours of soaking, the lifting device raises the suspension plate 8, lifting the basket 25 into the drying chamber 9. The heat-insulating bottom plate 11 is closed. After standing for 15 minutes, the drying device begins heating, drying at 105°C for 4 hours. The heating device is then turned off, while the heat-insulating bottom plate 11 and the fan are simultaneously turned on. After standing for 2.5 hours, the first heating and drying cycle is complete. The cycle is repeated four times, but the soaking time is adjusted to 4 hours each time. After the fifth cycle, the fine aggregate particles are washed in water at 47°C, dried, sieved, weighed, and the weight is calculated, thus completing the experiment.

[0060] Case 2: Robustness test of coarse aggregate in sodium sulfate saturated solution

[0061] Select the appropriate model of mesh basket 25 according to the particle size of the coarse aggregate, and hang the mesh baskets 25 on the hooks of the hanging plate 8, with a distance of not less than 20mm between the mesh baskets 25. The first control panel 3a can be used to set the number of cycles, drying time, soaking time, drying temperature, and the number of times the lifting device can move. Following step 2 above, place the solution tank 22 containing the prepared saturated sodium sulfate solution into the constant temperature water tank 12. The solution temperature can be set via the second control panel 3b, and the saturation state of the solution can be observed in real time. After setup, the experiment begins. The lifting device first lowers the suspension plate 8, fully immersing the basket 25 in the solution. During immersion, the basket is raised and lowered slightly 25 times to remove air bubbles, ensuring the aggregate particles do not protrude from the liquid surface. The basket is then left to stand in the solution for 20 hours, maintaining the solution temperature at 21°C. After 20 hours of soaking, the lifting device raises the suspension plate 8, lifting the basket 25 into the drying chamber 9. The heat-insulating bottom plate 11 is closed. After standing for 15 minutes, the drying device begins heating, drying at 105°C for 4 hours. The heating device is then turned off, while the heat-insulating bottom plate 11 and the fan are simultaneously turned on. After standing for 2.5 hours, the first heating and drying cycle is complete. The cycle is repeated four times, but the soaking time is adjusted to 4 hours each time. After the fifth cycle, the coarse aggregate particles are washed in water at 47°C, dried, sieved, weighed, and the weight is calculated. The experiment is then complete.

[0062] Case 3: A robustness test was conducted on fine aggregate in a saturated magnesium sulfate solution.

[0063] Select the appropriate model of mesh basket 25 according to the particle size specification of the fine aggregate, and hang the mesh baskets 25 on the hooks of the hanging plate 8, with a distance of not less than 20mm between the mesh baskets 25. The first control panel 3a can be used to set the number of cycles, drying time, soaking time, drying temperature, and the number of lifting cycles of the lifting device. Following step 2 above, place the solution tank 22 containing the prepared saturated magnesium sulfate solution into the constant temperature water tank 12. The solution temperature can be set through the second control panel 3b, and the saturation state of the solution can be observed in real time. After setup, the experiment begins. The lifting device first lowers the suspension plate 8, fully immersing the basket 25 in the solution. During immersion, the basket is raised and lowered slightly 25 times to remove air bubbles, ensuring the aggregate particles do not protrude from the liquid surface. The basket is then left to stand in the solution for 20 hours, maintaining the solution temperature at 21°C. After 20 hours of soaking, the lifting device raises the suspension plate 8, lifting the basket 25 into the drying chamber 9. The heat-insulating bottom plate 11 is closed. After standing for 15 minutes, the drying device begins heating, drying at 105°C for 4 hours. The heating device is then turned off, while the heat-insulating bottom plate 11 and the fan are simultaneously turned on. After standing for 2.5 hours, the first heating and drying cycle is complete. The cycle is repeated four times, but the soaking time is adjusted to 4 hours. After the fifth cycle, the fine aggregate particles are washed in water at 47°C, dried, sieved, weighed, and the weight is calculated, thus completing the experiment.

[0064] This utility model is not limited to the specific embodiments described above. Based on the above content and in accordance with the common technical knowledge and conventional methods in the field, without departing from the basic technical idea of ​​this utility model, other equivalent modifications, substitutions or alterations can be made to this utility model, all of which fall within the protection scope of this utility model.

Claims

1. A cyclic testing device for the soundness of highway aggregates, characterized in that: The device includes a box body, a constant temperature water tank, a drying device, a lifting device, a solution tank, a hanging plate, and one or more mesh baskets for holding aggregates. The lower part of the box body has a water tank receiving cavity, and the constant temperature water tank is slidably installed in the water tank receiving cavity and can be pulled out from the water tank receiving cavity. The solution tank is placed in the constant temperature water tank. The middle part of the box body has a drying chamber with an opening at the bottom. The opening has a heat-insulating bottom plate that can be opened and closed by a first power. When the heat-insulating bottom plate is opened, the drying chamber will be vertically connected to the water tank receiving cavity. The drying device is located in the drying chamber. The hanging plate is installed in the box body through the lifting device. The lifting device can drive the hanging plate to move up and down between the drying chamber and the solution tank. The lower part of the hanging plate has one or more hooks, through which one or more mesh baskets can be suspended.

2. The cyclic testing equipment for the soundness of highway aggregates according to claim 1, characterized in that: The constant temperature water tank is equipped with a support at the bottom, and the solution tank sits on the support.

3. The highway aggregate soundness cyclic testing equipment according to claim 2, characterized in that: The constant temperature water tank is equipped with a cooling pipe, a circulating water pump, and a heating pipe. The circulating water pump and the heating pipe are located inside the support, and the cooling pipe is located on the inner wall of the constant temperature water tank.

4. The highway aggregate soundness cyclic testing equipment according to claim 1, characterized in that: The road aggregate robustness cycle test equipment is also equipped with a probe placed inside the solution tank to detect the solution temperature and density.

5. The highway aggregate soundness cyclic testing equipment according to claim 1, characterized in that: The drying device includes a first fan and a heating wire. The heating wire is installed inside the drying chamber and can heat the drying chamber. The first fan is installed on the back plate of the drying chamber, and the back plate of the drying chamber is provided with an air outlet that connects the inner and outer spaces.

6. The cyclic testing equipment for the soundness of highway aggregates according to claim 1, characterized in that: The lifting device includes a second power source, second traction ropes respectively arranged at the four corners of the suspension plate, and second fixed pulleys arranged one-to-one with the second traction ropes. The second power source and the second fixed pulleys are located on the upper part of the box body. The position of the second fixed pulleys corresponds to the position of the four corners of the suspension plate. The second traction ropes pass over the second fixed pulleys. One end of the second traction rope is connected to the second power source, and the other end is connected to the suspension plate.

7. The cyclic testing equipment for the soundness of highway aggregates according to claim 6, characterized in that: The front of the cabinet body is provided with an upper cabinet door and a lower cabinet door, respectively, corresponding to the positions of the drying chamber and the water tank receiving chamber.

8. The cyclic testing equipment for the soundness of highway aggregates according to claim 1, characterized in that: The drying chamber is enclosed by heat insulation panels.

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