A heat preservation cover for constant temperature modified asphalt shear test

Abstract

This invention relates to a thermal insulation cover for a constant-temperature modified asphalt shear test, belonging to the technical field of asphalt testing equipment. The present invention addresses the problem in existing modified asphalt shear tests where the lack of a thermal insulation device in the electric heating container leads to a temperature difference between the upper and lower layers of asphalt, causing asphalt aging and affecting the stability of the shear test. The thermal insulation cover described in this application includes a base plate and two assembled cover units. The two assembled cover units are positioned opposite each other on top of the base plate, and each unit is slidably connected to the base plate via a guide rail. An electric heating sleeve is positioned between the two guide rails, with the combined ends of the two assembled cover units positioned above the electric heating sleeve. The combined cover units seal the top opening of the electric heating sleeve. This invention is primarily used as a thermal insulation structure for modified asphalt shear tests.

Description

Technical Field

[0001] This utility model belongs to the technical field of asphalt testing equipment, specifically relating to a heat-insulating cover for a constant-temperature modified asphalt shear test. Background Technology

[0002] In asphalt mixture mix design experiments, asphalt shear tests are necessary to study the effects of different formulations, components, and preparation processes on the performance of asphalt mixtures, thereby optimizing the mixture formulation and improving pavement performance and durability. During the test, the base asphalt is placed in an electrically heated container and heated to 150°C to improve its fluidity. However, as the test time increases, heat diffuses outwards from the opening of the electrically heated container, resulting in a lower asphalt temperature at the opening compared to the bottom. This creates a temperature difference between the upper and lower layers of asphalt, which can easily lead to asphalt aging and affect the stability of the shear test. Therefore, developing a heat-insulating cover for isothermal modified asphalt shear tests to reduce temperature loss and ensure stable testing under constant temperature conditions is essential. Utility Model Content

[0003] This invention aims to address the problem in existing modified asphalt shear tests where the lack of insulation in the electric heating container causes a temperature difference between the upper and lower layers of asphalt, which can easily lead to asphalt aging and affect the stability of the shear test. Therefore, this invention provides an insulation cover for constant-temperature modified asphalt shear tests.

[0004] A thermal insulation cover for a constant-temperature modified asphalt shear test includes a base plate and two assembled cover units. The two assembled cover units are arranged opposite each other on the top of the base plate, and each assembled cover unit is slidably connected to the base plate through a guide slide. An electric heating sleeve is arranged between the two guide slides, and the splicing ends of the two assembled cover units are both located above the electric heating sleeve. After the two assembled cover units are assembled, the top opening end of the electric heating sleeve is sealed.

[0005] Furthermore, the assembly cover unit includes a sliding seat, which is disposed on a guide slide and slidably connected to the guide slide. The top of the sliding seat is provided with a connector extending in the direction of the electric heating sleeve, and the connector is fixedly connected to the assembly cover body. A push handle is fixedly connected to the side of the sliding seat away from the electric heating sleeve.

[0006] Furthermore, the main body of the sliding seat has an L-shaped structure. The horizontal part of the sliding seat is the sliding part, the vertical part of the sliding seat is the supporting part, and a reinforcing rib is provided between the horizontal part and the vertical part. One side of the reinforcing rib is fixedly connected to the vertical part of the sliding seat, and the bottom of the reinforcing rib is fixedly connected to the horizontal part of the sliding seat.

[0007] Furthermore, the assembled cover includes a main cover, the connecting side of the main cover is fixed to the connector of the sliding seat, a matching half cover is embedded in the center of the main cover's assembly side, and a thermal insulation layer is attached to the inner side of the main cover.

[0008] Furthermore, the center of the mating side of the adapter half-cap is machined with a No. 1 groove for the rotor shaft or stator bushing of a high-speed shear emulsifier, and a sealing gasket is attached to the mating side of the adapter half-cap.

[0009] Furthermore, the splicing side of the adapter half-cap is also machined with a No. 2 groove that is compatible with the auxiliary connecting rod in the high-speed shear emulsifier;

[0010] Furthermore, the splicing side of one main body of the thermal insulation cover is provided with multiple insertion pins, and the splicing side of the other main body of the thermal insulation cover is provided with multiple insertion holes, and each insertion pin is coaxially corresponding to one insertion hole.

[0011] The beneficial effects of this application compared to the prior art are:

[0012] This application provides an insulating cover for a constant-temperature modified asphalt shear test, comprising two cover structures. These two structures can be opened and closed as needed. When an asphalt shear test is required, the two cover structures are closed to form a complete insulating cover structure. The interior of the insulating cover is lined with insulating and fireproof cotton to minimize heat loss, providing a relatively constant-temperature environment for the modified asphalt shear test. This ensures a relatively uniform temperature between the upper and lower layers of asphalt in the electric heating container, eliminating large temperature differences caused by heat loss and preventing asphalt aging during the experiment. This ensures the stable conduct of the modified asphalt shear test. After the test, the two cover structures are separated, exposing the electric heating container to normal conditions for easy material removal and replacement. During the test, personnel can observe the progress or the state of the modified asphalt by controlling the separation of the two cover structures. However, after observation, the insulating cover should be closed again promptly to ensure the stability of the constant-temperature environment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the thermal insulation cover described in Embodiment 1 of this application when it is opened;

[0014] Figure 2 This is a partial cross-sectional view of the thermal insulation cover described in Embodiment 1 of this application when it is opened;

[0015] Figure 3 This is a schematic diagram of the thermal insulation cover as described in Embodiment 1 of this application when it is closed;

[0016] Figure 4 This is a partial cross-sectional schematic diagram of the thermal insulation cover described in Embodiment 1 of this application when it is closed;

[0017] Figure 5 This is a top view of the two assembled covers in the thermal insulation cover described in Embodiment 1 of this application when they are opened;

[0018] Figure 6 This is a top view of the two assembled covers in the thermal insulation cover described in Embodiment 1 of this application when closed;

[0019] Figure 7 This is a schematic diagram of the splicing side of one of the splicing covers in the specific embodiment of this application;

[0020] Figure 8 This is a schematic diagram of the other splicing side of the insulation cover in the specific embodiment of this application;

[0021] Figure 9 This is a schematic diagram of the thermal insulation cover as described in Embodiment 2 of this application when it is opened;

[0022] Figure 10 This is a partial cross-sectional view of the thermal insulation cover described in Embodiment 2 of this application when it is opened;

[0023] Figure 11 This is a schematic diagram of the thermal insulation cover as described in Embodiment 2 of this application when it is closed;

[0024] Figure 12 This is a partial cross-sectional schematic diagram of the thermal insulation cover described in Embodiment 2 of this application when it is closed;

[0025] Figure 13 This is a top view of the two assembled covers in the thermal insulation cover described in Embodiment 2 of this application when they are opened;

[0026] Figure 14 This is a top view of the two assembled covers in the thermal insulation cover described in Embodiment 2 of this application when closed;

[0027] Figure 15 This is a schematic diagram of the splicing side of one of the splicing bodies in the thermal insulation cover described in Embodiment 2 of this application;

[0028] Figure 16 This is a schematic diagram of the other splicing side of the thermal insulation cover in the second specific embodiment of this application;

[0029] Figure 17 This is a schematic diagram showing the state after two stepped sealing blocks are arranged on the thermal insulation cover according to the second specific embodiment of this application.

[0030] Figure 18 This is a front view of the stepped sealing block in the thermal insulation cover described in Embodiment 2 of this application;

[0031] Figure 19 This is a side view of the stepped sealing block in the thermal insulation cover described in Embodiment 2 of this application;

[0032] The diagram shows: 1. Base plate; 11. Guide slide; 2. Assembly cover unit; 21. Sliding seat; 22. Assembly cover body; 221. Main cover body; 222. Adaptive half cover; 2221. No. 1 groove; 2222. Sealing gasket; 2223. No. 2 groove; 223. Thermal insulation layer; 224. Insert pin; 225. Insert hole; 226. Stepped sealing block; 23. Push handle; 24. Reinforcing rib; 3. High-speed shear emulsifier; and 4. Electric heating jacket. Detailed Implementation

[0033] Specific implementation method one: Combining Figures 1 to 8 This embodiment describes a thermal insulation cover for a constant-temperature modified asphalt shear test. The thermal insulation cover includes a base plate 1 and two assembled cover units 2. The two assembled cover units 2 are arranged opposite each other on the top of the base plate 1, and the two assembled cover units 2 are slidably connected to the base plate 1 through a guide slide 11. An electric heating sleeve 4 is arranged between the two guide slides 11, and the splicing ends of the two assembled cover units 2 are both located above the electric heating sleeve 4. After the two assembled cover units 2 are spliced ​​together, the top opening end of the electric heating sleeve 4 is sealed.

[0034] The assembly cover unit 2 includes a sliding seat 21, which is disposed on the guide slide 11 and slidably connected to the guide slide 11. The top of the sliding seat 21 is provided with a connector extending in the direction of the electric heating sleeve 4, and the connector is fixedly connected to the assembly cover body 22. A push handle 23 is fixedly connected to the side of the sliding seat 21 away from the electric heating sleeve 4.

[0035] The main body of the sliding seat 21 is an L-shaped structure. The horizontal part of the sliding seat 21 is the sliding part, and the vertical part of the sliding seat 21 is the supporting part. A reinforcing rib 24 is provided between the horizontal part and the vertical part. One side of the reinforcing rib 24 is fixedly connected to the vertical part of the sliding seat 21, and the bottom of the reinforcing rib 24 is fixedly connected to the horizontal part of the sliding seat 21.

[0036] The assembled cover 22 includes a main cover 221. The connecting side of the main cover 221 is fixed to the connector of the sliding seat 21. A matching half cover 222 is embedded in the center of the splicing side of the main cover 221. A heat insulation layer 223 is attached to the inner side of the main cover 221.

[0037] The center of the mating side of the adapter half cover 222 is machined with a No. 1 groove 2221 for the rotor shaft or stator bushing of the high-speed shear emulsifier 3, and a sealing gasket 2222 is attached to the mating side of the adapter half cover 222.

[0038] The main cover 221 of the thermal insulation cover has multiple insertion pins 224 on its splicing side, and the other main cover 221 of the thermal insulation cover has multiple insertion holes 225 on its splicing side, and each insertion pin 224 is coaxially corresponding to one insertion hole 225.

[0039] In this embodiment, the base plate 1 serves as the overall support structure for the constant-temperature modified asphalt shear test. During use, both the high-speed shear emulsifier 3 and the electric heating jacket 4 are arranged on the base plate 1. The high-speed shear emulsifier 3 is a Huxi brand FJ series high-speed shear emulsifier, and the electric heating jacket 4 is a Lichen brand ZNW type electric heating jacket. In this embodiment, the high-speed shear emulsifier 3 is mounted on the outside of the rotor shaft via a single stator bushing and connected to the bottom stator via the stator bushing. Based on this type of high-speed shear emulsifier with only a single stator bushing, this application optimizes the structure of the assembled cover 22. In the composite cover 22, the main cover 221 is the main component used to seal the top opening of the electric heating jacket 4. A sealing gasket is attached to the bottom of the main cover 221 to fit with the top of the electric heating jacket 4, preventing heat loss through the gap between the insulation cover and the electric heating jacket 4. An insulation layer 223 is attached to the inside of the main cover 221 to prevent heat loss from the inside of the cover. The insulation layer 223 is made of heat-insulating and fire-resistant cotton. The adapter half-cover 222 is a component used to cooperate with the high-speed shear emulsifier. In this embodiment, only one groove 2221 is machined in the middle of the adapter half-cover 222. When the thermal insulation cover described in this application is in operation, the two No. 1 grooves 2221 are joined together to form a through-hole structure. The through-hole structure is used to pass through the stator bushing to avoid interference during use. A sealing gasket is provided on the joining side of the adapter half cover 222 to fill the joining gap after the two adapter half covers 222 are joined together. In order to ensure the tightness of the joining, a corresponding sealing gasket can also be attached to the joining side of the main cover 221. However, when placing the sealing gasket, care should be taken to avoid the position of the insertion pin 224 and the insertion hole 225. The insertion pin 224 and the insertion hole 225 are in the insertion state when the two main cover bodies 221 are joined together. Furthermore, there is a certain friction between the two, which is less than the pushing force of the operator, thus ensuring the reliability of the two main covers 221 being assembled. In this embodiment, the assembly and opening of the assembly cover unit 2 are both manually driven. The operator controls the working position of the assembly cover unit 2 on the guide slide 11 by pushing the handle 23 on the sliding seat 21. The reinforcing rib 24 on the sliding seat 21 is located below the push handle 23. In addition to improving the structural strength of the sliding seat 21, it also helps to increase the counterweight on the side of the push handle 23 away from the electric heating sleeve 4, thus avoiding the assembly cover unit 2 from being unbalanced.

[0040] Specific Implementation Method Two: Combining Figures 9 to 19 This embodiment differs from specific embodiment one in that the splicing side of the adaptable half-cap 222 is further machined with a second groove 2223 adapted to the auxiliary connecting rod in the high-speed shear emulsifier 3. Other components and connection methods are the same as in specific embodiment one.

[0041] In this embodiment, in addition to the first groove 2221, the adapter half-cover 222 is also machined with at least one second groove 2223. The second groove 2223 is provided to accommodate some models of high-speed shear emulsifiers, such as the JRJ300 high-speed shear emulsifier from the Piao Ma brand, whose end stator is connected by multiple auxiliary connecting rods, rather than using a stator bushing as described in Specific Embodiment 1. To accommodate this type of high-speed shear emulsifier 3, this embodiment optimizes the structure of the adapter half-cover 222. Each second groove 2223 is connected to one auxiliary connecting rod used for connecting the stator in the high-speed shear emulsifier. Generally, there are four auxiliary connecting rods; therefore, two adapter half-covers 222 are machined with two of these rods respectively. If there are three auxiliary connecting rods, two No. 2 slots 2223 are machined on one adapter half cover 222 and one No. 2 slot 2223 is machined on the other adapter half cover 222. Since the No. 2 slots 2223 will form a strip hole structure after being assembled, the two corresponding auxiliary connecting rods will be set at both ends of the strip hole. Most of the area in the strip hole is connected to the inside and outside of the cover. Since the size of the strip hole is limited, the heat dissipated by the strip hole here can be ignored. If you want to further reduce the heat loss at the strip hole, you can also set a stepped sealing block 226 at the strip hole. The function of the stepped sealing block 226 is to seal the heat dissipation area of ​​the strip hole, thereby ensuring a relatively stable heat preservation environment.

[0042] The present invention has been disclosed above with reference to preferred embodiments, but it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

[0043] Working principle

[0044] In use, the electric heating jacket 4 is first placed between the two guide rails 11 on the base plate 1, ensuring it is directly below the working end of the high-speed shear emulsifier 3. The container holding the asphalt is then placed inside the electric heating jacket 4. Before the test begins, the electric heating jacket 4 needs to be preheated to 85℃. The temperature should be between ~95℃. After the electric heating jacket 4 is preheated, pour the asphalt used in the test into the electric heating jacket 4 and continue heating. When the temperature inside the electric heating jacket 4 reaches 150℃ and the asphalt becomes liquid, adjust the working height of the high-speed shear emulsifier 3 so that the working end of the high-speed shear emulsifier 3 enters the liquid asphalt. At this time, the staff manually pushes the two spliced ​​covers 22 towards each other to form a complete heat-insulating cover structure. At this time, the high-speed shear emulsifier 3 can be started to conduct a constant temperature modified asphalt shear test. During the test, the heat-insulating cover can prevent heat from escaping and provide a relatively constant temperature and stable environment for the test. During the test, the staff can open the heat-insulating cover to observe the test progress, but after observation, the heat-insulating cover should be closed again in time to ensure the stability of the constant temperature environment. After the test is completely finished, manually drive the two spliced ​​covers 22 to move in opposite directions until they return to the initial state. Then adjust the high-speed shear emulsifier 3 to rise and reset. At this time, the test personnel can remove the test asphalt and detect the test results.

Claims

1. An oven enclosure for constant temperature modified asphalt shear testing, characterized by: The heat insulation cover includes a base plate (1) and two splicing cover units (2). The two splicing cover units (2) are arranged opposite each other on the top of the base plate (1), and the two splicing cover units (2) are slidably connected to the base plate (1) through a guide slide (11). The electric heating sleeve (4) is arranged between the two guide slides (11), and the splicing ends of the two splicing cover units (2) are arranged above the electric heating sleeve (4). After the two splicing cover units (2) are spliced ​​together, the top opening end of the electric heating sleeve (4) is sealed.

2. The thermal insulation cover for a constant-temperature modified asphalt shear test according to claim 1, characterized in that: The assembly cover unit (2) includes a sliding seat (21), which is set on the guide slide (11) and slidably connected to the guide slide (11). The top of the sliding seat (21) is provided with a connector extending in the direction of the electric heating sleeve (4), and the connector is fixedly connected to the assembly cover body (22). A push handle (23) is fixedly connected to the side of the sliding seat (21) away from the electric heating sleeve (4).

3. The thermal insulation cover for a constant-temperature modified asphalt shear test according to claim 2, characterized in that: The main body of the sliding seat (21) is an L-shaped structure. The horizontal part of the sliding seat (21) is the sliding part, and the vertical part of the sliding seat (21) is the supporting part. A reinforcing rib (24) is provided between the horizontal part and the vertical part. One side of the reinforcing rib (24) is fixedly connected to the vertical part of the sliding seat (21), and the bottom of the reinforcing rib (24) is fixedly connected to the horizontal part of the sliding seat (21).

4. The thermal insulation cover for a constant-temperature modified asphalt shear test according to claim 3, characterized in that: The assembled cover (22) includes a main cover (221), the connecting side of the main cover (221) is fixed to the connector of the sliding seat (21), a matching half cover (222) is embedded in the center of the assembled side of the main cover (221), and a heat insulation layer (223) is attached to the inner side of the main cover (221).

5. The thermal insulation cover for a constant-temperature modified asphalt shear test according to claim 4, characterized in that: The center of the mating side of the adapter half cover (222) is machined with a No. 1 groove (2221) for the rotor shaft or stator shaft sleeve of the high-speed shear emulsifier (3), and a sealing gasket (2222) is attached to the mating side of the adapter half cover (222).

6. The thermal insulation cover for a constant-temperature modified asphalt shear test according to claim 5, characterized in that: The fitting side of the half-cap (222) is also machined with a second groove (2223) that is compatible with the auxiliary connecting rod in the high-speed shear emulsifier (3).

7. A thermal insulation cover for a constant-temperature modified asphalt shear test according to claim 4, 5 or 6, characterized in that: The main body (221) of the thermal insulation cover has multiple plug pins (224) on its splicing side, and the other main body (221) of the thermal insulation cover has multiple plug holes (225) on its splicing side, and each plug pin (224) is coaxially corresponding to a plug hole (225).

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