A self-leveling asphalt mixture test device

Abstract

The present invention discloses a self-leveling asphalt mixture testing device, comprising a test bench, on which a test piece fixture is installed, the test piece fixture comprising an upper fixture and a lower fixture, a loading device is installed on the upper fixture and / or the lower fixture, the loading device is used to drive the corresponding fixture to move toward the direction of the other fixture, the upper fixture and the lower fixture both comprise an inner plate and an outer plate, the outer plate is assembled on the test bench, a slide groove is provided in the outer plate, a first slider is installed at a corresponding position on the inner plate, the inner plate slides into the slide groove through the first slider to fit with the outer plate, or slides out and detaches from the outer plate through the first slider, the test piece is placed between the inner plate of the upper fixture and the inner plate of the lower fixture, the inner plate is disassembled separately to perform pretreatment operations on the test piece, no overall disassembly and assembly is required, time is saved, shielding plates are installed on both sides of the inner plate, which can shield the inner plate space to avoid splashing of the internal test piece during the test, and can block or slow down the exchange of the inner plate temperature with the outside world, improve the test accuracy, and reduce the influence of the outside world.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt performance testing, in particular to a self-leveling asphalt mixture testing device. Background Art

[0002] Self-leveling asphalt mixture is a reliable material for repairing potholes in asphalt pavements. The modulus of asphalt mixture is an important parameter in the design of asphalt pavement structure. Existing indoor test methods for the dynamic modulus of asphalt mixture include uniaxial compression, indirect tension, four-point bending, etc.; the uniaxial compression method is the most commonly used test method for the dynamic modulus of asphalt mixture. For example, the Marshall stability tester is used to measure the stability and flow value of asphalt mixture, providing an accurate basis for the composition and proportion design of asphalt mixture. The Marshall stability tester includes a base, on which a lifting platform and a motor for driving the lifting platform to rise and fall are arranged, upper and lower supports that are slidably matched are placed on the lifting platform, a cavity for placing a sample is formed between the upper and lower supports, a displacement sensor is installed on the lower support, a pressure sensor is fixed by a column directly above the lifting platform, and the pressure sensor and the displacement sensor are electrically connected with a control device, but in the existing device, each time a test is performed, the fixture needs to be manually disassembled and assembled, and then pre-treated with the test piece, which is time-consuming, labor-intensive, and inefficient, and the test needs to be performed in time after the pre-treatment to avoid the exchange of the test piece temperature with the outside world, which affects the test results. Therefore, a self-leveling asphalt mixture test device is urgently needed to solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to provide a self-leveling asphalt mixture testing device, which can effectively solve the problems existing in the above-mentioned prior art.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions: a self-leveling asphalt mixture test device, comprising a test bench, a test specimen fixture is installed on the test bench, the test specimen fixture comprises an upper fixture and a lower fixture, a loading device is installed on the upper fixture and / or the lower fixture, the loading device is used to drive the corresponding fixture to move toward the direction of another fixture, a displacement sensor is installed on the test specimen fixture, the displacement sensor is used to monitor the displacement of the upper fixture and / or the lower fixture in a moving state, a first pressure sensor is installed on the loading device, the upper fixture and the lower fixture both comprise an inner plate and an outer plate, the outer plate is assembled on the test bench, and a slide groove is provided in the outer plate, a first slider is installed at a corresponding position on the inner plate, the inner plate slides into the slide groove through the first slider to fit with the outer plate, or slides out of the outer plate through the first slider, and the test specimen is placed between the inner plate of the upper fixture and the inner plate of the lower fixture;

[0005] Shields are installed on both sides of the inner plate, and positioning adjustment structures are installed at the center of the two shields facing the inner plate. The two positioning adjustment structures are configured to have at least one surface that moves synchronously toward the center of the inner plate; the inner plate is slidably connected to the shields.

[0006] Preferably, the shield at least completely covers the test piece placed between the inner plate of the upper fixture and the inner plate of the lower fixture, and a first sliding block is also installed on the shield at a position corresponding to the slide groove in the outer plate.

[0007] Preferably, each of the shielding plates is provided with two slideways along the direction of the force of the loading device, and the inner plates of the upper clamp and the lower clamp are respectively installed with second sliders at the corresponding slideways, and the inner plates are slidably installed in the slideways through the second sliders; and

[0008] At least the top of the upper slideway is provided with an opening, and the inner plate at the corresponding position is separated from the shielding plate through the opening.

[0009] Preferably, an air passage is provided in the shield, the positioning and adjusting structure comprises an air bag installed at the center of the shield, a push plate is installed on the side of the air bag facing the inner plate, at least one of the shields is installed with an interface, the interface is communicated with the air passage, the air bag is communicated with the air passage, and the air bag is configured to drive the push plate to move toward the inner plate when inflated; and

[0010] The air passages of the two baffles are connected via a connecting pipe, and the connecting pipe is used to simultaneously transport gas into the air passages of the two baffles and control the push plates of the two baffles to move synchronously.

[0011] Preferably, a second pressure sensor is installed on each of the two push plates, and the two second pressure sensors are configured to control the airway to stop delivering gas in the direction of the airbag when both of them detect pressure.

[0012] Preferably, the inner plate of the upper fixture, the inner plate of the lower fixture and the two shielding plates constitute an inner lining structure;

[0013] A support plate is provided on at least one side of the outer plate of the upper clamp and the outer plate of the lower clamp, and a slide groove corresponding to the first slider is also provided on the support plate, and a plurality of lining structures can be supported on the support plate toward the outer plate; and

[0014] The test bench is equipped with a hydraulic telescopic device, the telescopic end of which is arranged toward the support plate, and the hydraulic telescopic device is configured to push the lining structures on the support plate into the outer plate one by one.

[0015] Preferably, support plates are installed on both sides of the outer plate, and the support plate on the side away from the hydraulic telescopic device is configured to support an inner lining structure.

[0016] Preferably, a first interface is installed on the shield plate on one side of the inner plate, and a second interface is installed on the shield plate on the other side, and the first interface is used to splice the second interface of the adjacent shield plate; and

[0017] The telescopic end of the hydraulic telescopic device is equipped with a first interface, the first interface is used to plug the corresponding second interface of the shield, and the telescopic end of the hydraulic telescopic device is equipped with an air pipe, the air pipe is connected to the first interface;

[0018] At least a solenoid valve is installed on the first interface and the second interface of the shutter, and the solenoid valve is used to control the opening or closing of the corresponding interface.

[0019] Preferably, the positioning and adjustment structure of each of the baffles includes a plurality of airbags, which are evenly distributed on the baffle with the center of the baffle as the center of the circle, and each of the airbags is provided with a push plate, and each of the push plates is provided with a second sensor. When any relative second pressure sensors on two of the baffles monitor the pressure at the same time, the airway is controlled to stop supplying gas in the direction of the airbag.

[0020] Preferably, a heating plate is installed inside the outer plate, and the heating plate is configured to at least adjust the temperature of a side of the outer plate facing the inner plate.

[0021] Beneficial effect: The fixture of the present invention is arranged through the outer plate and the inner plate, and the inner plate can be disassembled separately to perform pre-treatment operations on the test piece, without the need for overall disassembly and assembly, thus saving time. In addition, an inner plate can be paired with one test piece, and an outer plate can be paired with multiple inner plates to achieve an independent test piece environment, avoid residues on the inner plate affecting other test pieces, and improve test accuracy.

[0022] The shield can shield the inner panel space to avoid splashing of the internal specimen during the test, thus improving the test safety. On the other hand, the inner panel space is independent, blocking or slowing down the exchange of the inner panel temperature with the outside world, thus improving the test accuracy and reducing the impact of the outside world.

[0023] In addition, the positioning and adjustment structure on the inner plate can automatically adjust the position of the test piece in the inner plate to the center of the inner plate without manual adjustment, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0025] In the attached picture:

[0026] Figure 1It is a schematic diagram of the structure of the test device of the present invention;

[0027] Figure 2 is a side view of the test device of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the test bench of the present invention;

[0029] Figure 4 It is a structural schematic diagram of a single lining structure of the present invention;

[0030] Figure 5 It is a detailed structural schematic diagram of the lining structure of the present invention;

[0031] Figure 6 It is a schematic diagram of the internal structure of the lining structure of the present invention;

[0032] Figure 7 It is a structural schematic diagram of the lining structure and the support plate of the present invention;

[0033] Figure 8 is a schematic structural diagram of multiple airbag lining structures of the present invention;

[0034] Numbers in the figure: 1. test bench; 2. loading device; 3. displacement sensor; 4. first pressure sensor; 5. outer plate; 6. inner plate; 7. slide groove; 8. first slider; 9. shield; 10. slideway; 11. second slider; 12. airway; 13. airbag; 14. push plate; 15. first interface; 16. second interface; 17. connecting pipe; 18. second pressure sensor; 19. support plate; 20. hydraulic telescopic device; 21. air pipe; 22. solenoid valve; 23. heating plate; 24. independent channel. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described below in conjunction with the drawings in the embodiments of the present invention. The terms used in the implementation mode of the present invention are only used to explain the specific embodiments of the present invention, and are not intended to limit the present invention. The embodiments of the present application are described below in conjunction with the drawings.

[0036] Example: Figure 1-Figure 3As shown, a self-leveling asphalt mixture test device includes a test bench 1, a test bench 1 is installed with a test piece fixture, the test piece fixture includes an upper fixture and a lower fixture, a loading device 2 is installed on the upper fixture and / or the lower fixture, the loading device 2 is used to drive the corresponding fixture to move toward the other fixture direction, a displacement sensor 3 is installed on the test piece fixture, the displacement sensor 3 is used to monitor the displacement of the upper fixture and / or the lower fixture in a moving state, and a first pressure sensor 4 is installed on the loading device 2; a control device is provided on one side of the test bench 1, and the displacement sensor 3 and the first pressure sensor 4 are evenly connected to the control device, and the data monitored by the displacement sensor 3 and the first pressure sensor 4 are collected by the control device. At the same time, the loading device 2 is also connected to the control device, and the start and stop of the loading device 2 are controlled by the control device. For the specific structure of the loading device 2, for example, a structure that can be telescopically controlled, such as a hydraulic cylinder, can be used to realize the loading function. For example, refer to Figure 1 As shown, a loading device 2 is arranged below the lower fixture, and the loading device 2 controls the lower fixture to move upward. Figure 1 In the process, the upper fixture and the lower fixture are arranged vertically, and the self-leveling asphalt mixture is made into a Marshall specimen; multiple groups of Marshall specimens are placed between the upper fixture and the lower fixture to make the specimens bear the load, and the performance of the self-leveling asphalt mixture is measured;

[0037] refer to Figure 1 and Figure 4 As shown, both the upper fixture and the lower fixture include an inner plate 6 and an outer plate 5, the outer plate 5 is assembled on the test bench 1, and a slide groove 7 is provided in the outer plate 5, and a first slider 8 is installed at a corresponding position on the inner plate 6, the inner plate 6 slides into the slide groove 7 through the first slider 8 to fit with the outer plate 5, or slides out of the outer plate 5 through the first slider 8, and the test piece is placed between the inner plate 6 of the upper fixture and the inner plate 6 of the lower fixture;

[0038] refer to Figure 4 As shown, baffles 9 are installed on both sides of the inner panel 6, and positioning adjustment structures are installed at the center of the two baffles 9 toward the inner panel 6. The two positioning adjustment structures are configured to have at least one surface that moves synchronously toward the center of the inner panel 6, and the inner panel 6 is slidably connected to the baffles 9.

[0039] The shield plate 9 at least completely covers the test piece placed between the inner plate 6 of the upper fixture and the inner plate 6 of the lower fixture, and a first sliding block 8 is also installed on the shield plate 9 at a position corresponding to the slide groove 7 in the outer plate 5;

[0040] The specimen is placed between the two inner plates 6, and then the two inner plates 6 are placed between the two shielding plates 9 or the two shielding plates 9 are installed on both sides of the two inner plates 6 to shield the internal space of the two inner plates 6. Since the thickness of a conventional specimen is smaller than the thickness of the inner plate 6, it is usually necessary to adjust the position of the specimen after placing it so that the specimen is placed at the center of the inner plates 6 (the middle position of the fixture). In this embodiment, the movement of the specimen between the two inner plates 6 can be controlled through the positioning and adjustment structure so that it moves to the center of the two inner plates 6.

[0041] Before the test piece is tested, it is necessary to cure the specimen according to the test requirements, such as curing at room temperature, vacuum saturating with water according to the standard saturation test method, and then returning to normal pressure, or curing at a preset temperature, such as treating the specimen in a water bath at a preset temperature;

[0042] In this embodiment, the shield plate 9 can shield and seal the space formed by the two inner plates 6, thereby blocking or slowing down the exchange of temperature between the inner plate 6 and the outside world, improving the test accuracy, and reducing external influences. At the same time, the shield plate 9 can also block the splashing caused by accidental breakage of the test piece during the test, thereby improving the safety of the test.

[0043] In a specific embodiment, reference Figure 4-Figure 6 As shown, two slideways 10 are provided on each baffle 9 along the direction of the force of the loading device 2, and the inner plate 6 of the upper clamp and the inner plate 6 of the lower clamp are respectively installed with second sliders 11 at the corresponding slideways 10, and the inner plate 6 is slidably installed in the slideway 10 through the second sliders 11.

[0044] The inner plate 6 is installed in the slide groove 7 through the first slider 8 to realize the assembly of the two inner plates 6. Based on the above, when loading, the inner plate 6 of the lower fixture is forced to move upward, and at this time, the inner plate 6 slides along the corresponding slideway 10 through the second slider 11;

[0045] At least the top of the upper slideway 10 is provided with an opening, and the inner plate 6 at the corresponding position is separated from the shield plate 9 through the opening, for example, referring to Figure 5 As shown, an opening is provided at the top of the slide 10 above the baffle 9. In the initial state, the lower inner plate 6 can be pre-installed between the two baffles 9, and the upper inner plate 6 is slid upward and taken out from the opening. The baffle 9, the inner plate 6 and the test piece are placed together in the same environment for pretreatment. After completion, the test piece is placed above the lower inner plate 6, and then the upper inner plate 6 is assembled between the two baffles 9.

[0046] The positioning and adjusting structure is provided with one or more surfaces for contacting the specimen. The surface has a certain strength so that it does not deform after contacting the specimen and can stably push the specimen to move. It also has a power structure that can push the surface, such as a telescopic cylinder, a gear rack matching structure, etc.

[0047] Based on the above, in a specific embodiment, refer to Figure 4-Figure 6 As shown, an air passage 12 is provided in the baffle 9, and the positioning and adjusting structure includes an air bag 13 installed at the center of the baffle 9, and a push plate 14 is installed on the side of the air bag 13 facing the inner panel 6, and an interface is installed on at least one baffle 9, and the interface is connected with the air passage 12, and the air bag 13 is connected with the air passage 12, and the air bag 13 is configured to drive the push plate 14 to move toward the side of the inner panel 6 when inflated; and the air passages 12 of the two baffles 9 are connected through a connecting pipe 17, and the connecting pipe 17 is used to simultaneously convey gas to the air passages 12 of the two baffles 9, and control the synchronous movement of the push plates 14 of the two baffles 9.

[0048] The airbag 13 has a certain degree of concealment, and can be deformed and hidden on one side of the shield plate 9 in a contracted state. A groove or other structure can be provided on the shield plate 9 to accommodate the airbag 13, thereby reducing the space occupied by the inner plate 6 and also minimizing the thickness requirement of the shield plate 9 itself.

[0049] In addition, ventilation through the airbag 13 can evenly provide force to one side of the push plate 14, so that the push plate 14 can move stably. At the same time, the airbag 13 has a certain elastic space for the test piece and the push plate 14 to squeeze and avoid.

[0050] Furthermore, by connecting with an external air pump or other device through an interface, the above functions can be realized by controlling the expansion of the airbag 13 through gas. The structure is simple and there is no need to set multiple driving structures in the shield 9.

[0051] Based on the above, the second pressure sensors 18 are installed on both push plates 14 , and the two second pressure sensors 18 are configured to control the airway 12 to stop delivering gas to the airbag 13 when both second pressure sensors 18 detect pressure.

[0052] In a specific implementation process, the test piece is placed between the two inner plates 6, and air is ventilated into the airbag 13. At this time, the push plates 14 on both sides move toward the inner plates 6. When the push plate 14 on one side contacts the test piece, it pushes the test piece to move synchronously until the push plate 14 on the other side also contacts the test piece. At this time, it is determined that the second pressure sensors 18 on the two push plates 14 simultaneously monitor the pressure and feedback signals, and the airbag 13 stops ventilating. At this time, the test piece is in the center position of the inner plate 6.

[0053] In a specific embodiment, based on the above, a heating plate 23 is installed in the outer plate 5. The heating plate 23 is defined as providing energy to the outer plate 5, that is, it can control the outer plate 5 to increase the temperature or control the outer plate 5 to decrease the temperature. The heating plate 23 is configured to at least adjust the temperature of the side of the outer plate 5 facing the inner plate 6;

[0054] Based on the above, the following scenarios are implemented:

[0055] After the inner plate 6 and the test piece are pre-treated, the outer plate 5 is controlled by the heating plate 23 to adjust the temperature so that it is synchronized to the pre-treated temperature, thereby improving the test accuracy;

[0056] After the inner plate 6 and the test piece are pre-treated, the outer plate 5 is controlled by the heating plate 23 to adjust the temperature so that it is synchronized to the pre-treatment temperature, and the outer plate 5 is quickly changed in temperature during the test to obtain the test results in this case;

[0057] Or other corresponding test results obtained by subjecting the outer plate 5 to a temperature change treatment through the heating plate 23 .

[0058] In a specific embodiment, reference Figure 1-Figure 2 ,as well as Figure 7 As shown, the inner plate 6 of the upper clamp and the inner plate 6 of the lower clamp and the two shielding plates 9 constitute a lining structure; a support plate 19 is provided on at least one side of the outer plate 5 of the upper clamp and the outer plate 5 of the lower clamp, and a slide groove 7 corresponding to the first slider 8 is also provided on the support plate 19, and multiple lining structures can be supported on the support plate 19 facing the outer plate 5; and a hydraulic telescopic device 20 is installed on the test bench 1, and the telescopic end of the hydraulic telescopic device 20 is arranged toward the support plate 19, and the hydraulic telescopic device 20 is configured to push the lining structures on the support plate 19 into the outer plate 5 one by one.

[0059] refer to Figure 1-Figure 3 As shown, support plates 19 are installed on both sides of the outer plate 5, and the support plate 19 on the side away from the hydraulic telescopic device 20 is configured to support a lining structure.

[0060] by Figure 2For example, the left side of the fixture is the entry end, and the right side of the fixture is the output end. The pallet 19 that can store multiple lining structures is located on the left side of the fixture, and the pallet 19 that can store one lining structure is located on the right side of the fixture, and the hydraulic telescopic device 20 is arranged on the left side of the pallet 19, and its telescopic end is telescoped toward the direction of the pallet 19. Multiple lining structures can be slidably installed in the left side pallet 19 in advance. Based on the above, it can be ensured that the temperature of the test piece in each lining structure will not change significantly, meeting the test requirements. During the experiment, the hydraulic telescopic device 20 is started, and all the lining structures are pushed to slide in the pallet 19 toward the outer plate 5 through its telescopic end. The hydraulic telescopic device 20 is controlled to control the telescopic end to move one A fixed distance is set, that is, the distance is set by the width of the inner plate 6 and the baffle 9, so as to control the inner plate 6 to be between the outer plate 5, and the two baffles 9 to be on both sides of the outer plate 5. After the above movement, the frontmost inner plate 6 can enter the outer plate 5 and be in a state to be tested. After starting the loading equipment 2 for testing, the whole is reset, and the hydraulic telescopic device 20 is started. The above is repeated to push the frontmost lining structure onto the right side support plate 19, waiting for the operator to remove it; the length of the right side support plate 19 can also be set to be equal to the left side support plate 19 to store all the lining structures to be tested; the above is repeated until the test of all lining structures is completed, and there is no need to manually disassemble and test them one by one, thereby improving efficiency.

[0061] In a specific embodiment, reference Figure 2 and Figure 6 As shown, a first interface 15 is installed on the baffle 9 on one side of the inner plate 6, and a second interface 16 is installed on the baffle 9 on the other side, and the first interface 15 is used to splice the second interface 16 of the adjacent baffle 9; and the telescopic end of the hydraulic telescopic device 20 is installed with a first interface 15, and the first interface 15 is used to plug into the second interface 16 of the corresponding baffle 9, and the telescopic end of the hydraulic telescopic device 20 is installed with an air pipe 21, and the air pipe 21 is connected to the first interface 15; at least an electromagnetic valve 22 is installed on the first interface 15 and the second interface 16 of the baffle 9, and the electromagnetic valve 22 is used to control the opening or closing of the corresponding interface.

[0062] Based on the above, multiple lining structures are spliced ​​in sequence through the first interface 15 and the second interface 16, and the hydraulic telescopic device 20 is started. The first interface 15 of the telescopic end is inserted into the second interface 16 of the corresponding shield 9 to connect, and gas is delivered to the shield 9 of the lining structure. At this time, all lining structures are adjusted until the test pieces in all lining structures are adjusted to the middle position and stopped;

[0063] For the above-mentioned adjustment, an independent channel 24 can be set between the two baffles 9 of the lining structure to provide gas circulation between the lining structures. That is, due to the series setting, when the adjustment of the middle lining structure is completed, the solenoid valve 22 on this lining structure controls the corresponding interface to close. At this time, the gas cannot enter the lining structure, but can flow directly into the next lining structure through the independent channel, thereby completing the adjustment work of all the lining structures in sequence.

[0064] In a specific embodiment, reference Figure 8 As shown, the positioning and adjustment structure of each baffle 9 includes a plurality of airbags 13, and the airbags 13 are evenly distributed on the baffle 9 with the center of the baffle 9 as the center of the circle. Each airbag 13 is provided with a push plate 14, and each push plate 14 is provided with a second sensor. When any relative second pressure sensors 18 on two baffles 9 monitor the pressure at the same time, the airway 12 is controlled to stop delivering gas to the direction of the airbag 13.

[0065] In addition to realizing the above functions, the multiple airbags 13 can also monitor various parts of the test piece during the test. That is, during the test, the deformation pressure at different test positions is monitored by the second sensor on each airbag 13. The data can be used to further assist in determining the asphalt performance. Among them, since the airbag 13 is elastic, it will not affect the loading test.

[0066] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. For ordinary technicians in this technical field, after knowing the contents recorded in the present invention, they can make several equivalent changes and substitutions without departing from the principle of the present invention. These equivalent changes and substitutions should also be regarded as belonging to the protection scope of the present invention.

Claims

1. A self-leveling asphalt mixture test device, comprising a test bench, a test specimen fixture is installed on the test bench, the test specimen fixture comprises an upper fixture and a lower fixture, a loading device is installed on the upper fixture and / or the lower fixture, the loading device is used to drive the corresponding fixture to move toward another fixture direction, a displacement sensor is installed on the test specimen fixture, the displacement sensor is used to monitor the displacement of the upper fixture and / or the lower fixture in a moving state, a first pressure sensor is installed on the loading device, and the characteristics are: The upper fixture and the lower fixture both include an inner plate and an outer plate, the outer plate is assembled on the test bench, and a slide groove is provided in the outer plate, a first slider is installed at a corresponding position of the inner plate, the inner plate slides into the slide groove through the first slider to fit with the outer plate, or slides out of the outer plate through the first slider, and the test piece is placed between the inner plate of the upper fixture and the inner plate of the lower fixture; Shields are installed on both sides of the inner plate, and positioning adjustment structures are installed on the two shields at the center facing the inner plate, and the two positioning adjustment structures are configured to have at least one surface that moves synchronously toward the center of the inner plate; the inner plate is slidably connected to the shields; An air passage is arranged in the shield, the positioning adjustment structure comprises an air bag installed at the center of the shield, a push plate is installed on the side of the air bag facing the inner plate, at least one of the shields is installed with an interface, the interface is communicated with the air passage, the air bag is communicated with the air passage, and the air bag is configured to drive the push plate to move toward the inner plate when inflated; as well as The air passages of the two baffles are connected via a connecting pipe, and the connecting pipe is used to simultaneously transport gas into the air passages of the two baffles and control the push plates of the two baffles to move synchronously.

2. A self-leveling asphalt mixture testing device according to claim 1, characterized in that: The shield at least completely covers the test piece placed between the inner plate of the upper fixture and the inner plate of the lower fixture, and a first sliding block is also installed on the shield at a position corresponding to the slide groove in the outer plate.

3. A self-leveling asphalt mixture testing device according to claim 1, characterized in that: Each of the shielding plates is provided with two slideways along the direction of the force of the loading device, and the inner plates of the upper clamp and the lower clamp are respectively provided with second sliders at the corresponding slideways, and the inner plates are slidably installed in the slideways through the second sliders; and At least the top of the upper slideway is provided with an opening, and the inner plate at the corresponding position is separated from the shielding plate through the opening.

4. A self-leveling asphalt mixture testing device according to claim 1, characterized in that: The two push plates are both installed with a second pressure sensor, and the two second pressure sensors are configured to control the airway to stop delivering gas toward the airbag when both detect pressure.

5. A self-leveling asphalt mixture testing device according to any one of claims 1 to 4, characterized in that: The inner plate of the upper fixture, the inner plate of the lower fixture and the two shielding plates constitute an inner lining structure; A support plate is provided on at least one side of the outer plate of the upper clamp and the outer plate of the lower clamp, and a slide groove corresponding to the first slider is also provided on the support plate, and a plurality of lining structures can be supported on the support plate toward the outer plate; and The test bench is equipped with a hydraulic telescopic device, the telescopic end of which is arranged toward the support plate, and the hydraulic telescopic device is configured to push the lining structures on the support plate into the outer plate one by one.

6. A self-leveling asphalt mixture testing device according to claim 5, characterized in that: Support plates are installed on both sides of the outer plate, and the support plate on the side away from the hydraulic telescopic device is configured to support an inner lining structure.

7. A self-leveling asphalt mixture testing device according to claim 5, characterized in that: A first interface is installed on the shield plate on one side of the inner plate, and a second interface is installed on the shield plate on the other side, wherein the first interface is used to splice the second interface of the adjacent shield plate; and The telescopic end of the hydraulic telescopic device is equipped with a first interface, the first interface is used to plug the corresponding second interface of the shield, and the telescopic end of the hydraulic telescopic device is equipped with an air pipe, the air pipe is connected to the first interface; At least a solenoid valve is installed on the first interface and the second interface of the shutter, and the solenoid valve is used to control the opening or closing of the corresponding interface.

8. The self-leveling asphalt mixture testing device according to claim 1, characterized in that: The positioning and adjustment structure of each baffle includes a plurality of airbags, which are evenly distributed on the baffle with the center of the baffle as the center of the circle. Each airbag is provided with a push plate, and each push plate is provided with a second sensor. When any relative second pressure sensors on two baffles monitor the pressure at the same time, the airway is controlled to stop delivering gas in the direction of the airbag.

9. The self-leveling asphalt mixture testing device according to claim 1, characterized in that: A heating plate is installed inside the outer plate, and the heating plate is configured to at least adjust the temperature of a side of the outer plate facing the inner plate.

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