Device for testing low-temperature fluidity of asphalt

Abstract

The invention relates to the technical field of asphalt detection, in particular to a device for testing low-temperature fluidity of asphalt, which comprises a test board, a temperature adjusting pot for placing asphalt is arranged on the test board, a fixed frame is fixedly connected to the top end of the test board, a rotating frame is rotatably connected to the top end of the fixed frame, and a U-shaped frame is arranged at the bottom end of the rotating frame relative to the position above the temperature adjusting pot. Through the arrangement of the locking mechanism, the unlocking mechanism, the rotating motor and other structures, the testing head can be transferred to the placing frame at first, then the testing head is placed in the placing groove through the upper electric telescopic cylinder, then locking between the testing head and the sliding rod is relieved through the unlocking electric telescopic cylinder, then the sliding rod is moved away through the upper electric telescopic cylinder, and then the testing head is placed in the placing groove through the upper electric telescopic cylinder. The automatic unlocking between the test head and the sliding rod can be realized by moving one test head to the lower part of the sliding rod, and then the other test head is moved to the lower part of the sliding rod and is driven by the upper electric telescopic cylinder to be inserted, so that the test head and the sliding rod can be locked, the automatic replacement of the test head is realized, and the convenience of the device is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of asphalt testing technology, and in particular to a device for testing the low-temperature fluidity of asphalt. Background Technology

[0002] In the fields of transportation construction and materials research, devices used to test the low-temperature fluidity of asphalt play a crucial role. They simulate the behavior of asphalt in low-temperature environments under actual use conditions, providing a scientific basis for road construction and maintenance. Temperature is a key parameter in asphalt low-temperature fluidity testing because the viscosity of asphalt increases and its fluidity decreases at low temperatures, resulting in significantly different performance compared to high temperatures. Accurately controlling the test temperature can simulate the environment under actual use conditions, thereby better evaluating the performance of asphalt under low-temperature conditions. This is essential for predicting the behavior of asphalt pavements in cold climates (such as crack resistance).

[0003] The prior art discloses a fully automatic Liuer flowability measuring device. Through the first control module, the first heating element can heat the drop hammer. Under the action of the first sensor, the drop hammer can be heated to the same temperature as the asphalt to be tested. Under the action of the support mechanism, the temperature of the drop hammer can be reduced to reduce the impact of the temperature of the drop hammer on the asphalt to be tested, thereby improving the detection accuracy of asphalt flowability.

[0004] However, the aforementioned devices still have some shortcomings in actual testing. Currently, when using asphalt fluidity testing devices, different specifications of test heads need to be replaced when higher accuracy or different testing standards are required. However, most asphalt low-temperature fluidity testing devices require manual disassembly and assembly by operators when changing test heads. This process is not only cumbersome and time-consuming, but also, in low-temperature testing environments, the temperature of the test head is usually low. It is often necessary to wait for the test head temperature to rise to near room temperature before disassembly and replacement can be performed. This waiting process not only prolongs the testing cycle but may also lead to fluctuations in the testing environment temperature, thus affecting the accuracy of the test results. Summary of the Invention

[0005] To address the aforementioned problems, this invention aims to propose a device for testing the low-temperature fluidity of asphalt. It uses a temperature-controlled pot to simulate a low-temperature environment, a rotating frame and related drive structure to adjust the position of the test head, a locking and unlocking mechanism to ensure easy replacement of the test head, and a position sensor for precise positioning. This solves the problems of inconvenient test head replacement and interference in existing devices, providing a stable and reliable basic structure for testing the low-temperature fluidity of asphalt.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows: An apparatus for testing the low-temperature fluidity of asphalt includes a test platform with a temperature-regulating pot for holding asphalt. A fixed frame is fixedly connected to the top of the test platform, and a rotating frame is rotatably connected to the top of the fixed frame. A U-shaped frame is located at the bottom of the rotating frame relative to the top of the temperature-regulating pot. A mounting sleeve is fixedly connected to the bottom of the U-shaped frame. A sliding rod is located inside the U-shaped frame, with its bottom end passing through the bottom end of the mounting sleeve. A test head is located below the sliding rod. An electromagnet is fixedly connected to the bottom of the U-shaped frame relative to the sliding rod. An upper electric telescopic cylinder is fixedly connected to the top of the rotating frame, with its output end passing through the top of the rotating frame and fixedly connected to the top of the U-shaped frame. A locking mechanism for locking the test head is located below the sliding rod. A placement frame is fixedly connected to the top of the test platform, and the placement frame has an unlocking mechanism for releasing the locking mechanism. A pair of upper position sensors are fixedly connected to the outer wall of the sliding rod, and a lower position sensor is fixedly connected to the inner side of the U-shaped frame.

[0007] Furthermore, the slide bar is made of a material that can be attracted by an electromagnet, a lower electric telescopic cylinder is fixedly connected through the bottom end of the U-shaped frame, a top plate is fixedly connected to the top end of the slide bar, and a push block is fixedly connected to the output end of the lower electric telescopic cylinder relative to the position below the top plate.

[0008] Furthermore, a rotary motor is fixedly connected to the top of the fixed frame, and the output end of the rotary motor passes through the fixed frame and is fixedly connected to the bottom of the rotary frame.

[0009] Furthermore, the locking mechanism includes a locking plate, which is provided in pairs. A pair of top grooves are provided at the top of the test head. An L-shaped plate is laterally slidably connected in the top groove. Several upper right-angled blocks with inclined surfaces are fixedly connected at equal intervals on the inner side of the L-shaped plate. A pair of upper springs are fixedly connected between the inner side of the top groove and the side wall of the L-shaped plate. The locking plate is fixedly connected to the bottom end of the slide rod and is located above the inner side of the L-shaped plate. A groove is provided on the adjacent side of the locking plate. Lower right-angled blocks with inclined surfaces are slidably connected in the inner side of each groove. A pair of lower springs are fixedly connected in the inner side of each groove.

[0010] Furthermore, a limiting plate is fixedly connected to the side wall of the lower right-angle block, and the other end of the lower spring is fixedly connected to the side wall of the limiting plate, and the inclined surface of the lower right-angle block is in contact with the inclined surface of one of the upper right-angle blocks.

[0011] Furthermore, a straight groove is provided through the top groove on the side away from the top groove, and a push rod is fixedly connected to the side wall of the L-shaped plate relative to the position inside the straight groove.

[0012] Furthermore, the unlocking mechanism includes an unlocking electric telescopic cylinder, and a pair of unlocking electric telescopic cylinders are provided. The top of the placement frame is provided with a placement plate, and the top of the placement plate is provided with several placement slots that are adapted to the test head at equal intervals. Four slots are provided at equal intervals on the inner side of the placement slots. Four plug blocks that are adapted to the slots are fixedly connected at equal intervals to the outer wall of the test head. A side plate is fixedly connected to the top of the placement frame. The unlocking electric telescopic cylinders are all fixedly connected to the side wall of the side plate. The output end of the unlocking electric telescopic cylinder passes through the side plate and is fixedly connected to an unlocking block. A pushing electric telescopic cylinder is fixedly connected to the bottom of the placement frame. A lower plate is fixedly connected to the bottom of the placement plate. The output end of the pushing electric telescopic cylinder is fixedly connected to the side wall of the lower plate.

[0013] Furthermore, the test head has a U-shaped cooling cavity inside, the slide rod has a pair of connecting cavities inside, and the bottom of the slide rod is fixedly connected to a conical sealing block for insertion into the U-shaped cooling cavity at a position below the connecting cavity. The top of the rotating frame is fixedly connected to a low-temperature air cooler, and the top of each connecting cavity is fixedly connected to a flexible hose. The other end of the flexible hose is fixedly connected to the inlet and outlet of the low-temperature air cooler.

[0014] Furthermore, the hose is made of a low-temperature resistant elastic material, and a spiral metal protective sleeve is fitted on the outside of the hose to prevent damage to the hose during frequent expansion and contraction.

[0015] Furthermore, the temperature regulating pot is equipped with a temperature sensor on its inner side, and the outer wall of the pot is wrapped with an insulation layer. The inner side of the insulation layer is equipped with heating wires and cooling plates for precise control of the temperature of the asphalt inside the pot.

[0016] Beneficial effects: 1. The present invention, through the setting of locking mechanism, unlocking mechanism and rotary motor, can first transfer the test head to the placement rack, then place the test head in the placement slot by the upper electric telescopic cylinder, then release the lock between the test head and the slide rod by the unlocking electric telescopic cylinder, and then move the slide rod away by the upper electric telescopic cylinder, thereby realizing the automatic unlocking between the test head and the slide rod. Then, another test head is moved to the bottom of the slide rod and inserted by the upper electric telescopic cylinder, thereby realizing the locking between the two, thus realizing the automatic replacement of the test head, greatly improving the convenience of the device.

[0017] 2. The present invention, through the design of a U-shaped cooling chamber, a flexible hose, and a low-temperature air cooler, can cool the cooling head before testing, thereby ensuring that the test head is close to the low-temperature testing temperature of asphalt. This avoids the test head's own temperature affecting the accuracy of the test results when the test head is placed on the asphalt. At the same time, the conical sealing block ensures that the automatic replacement of the test head is not affected, while also ensuring a sealed connection between the two. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a frontal perspective view of the device for testing the low-temperature fluidity of asphalt according to an embodiment of the present invention. Figure 2 Appendix of the present invention Figure 1 A magnified view of the structure at point A in the middle; Figure 3 This is a bottom-view perspective view of the placement rack of the present invention. Figure 4 This is a rear-view perspective three-dimensional structural diagram of the rotating frame of the present invention; Figure 5 Appendix of the present invention Figure 4 A magnified schematic diagram of the structure at point B in the middle; Figure 6 This is a schematic diagram of the three-dimensional structure of the U-shaped frame from the front. Figure 7 Appendix of the present invention Figure 6 A magnified schematic diagram of the structure at point C in the middle; Figure 8 This is a three-dimensional structural diagram of the test head and locking plate separated, viewed from below. Figure 9 This is a schematic diagram of the frontal full-section three-dimensional structure of the test head of the present invention; Figure 10 This is a schematic diagram of the overall appearance structure of the L-shaped plate and locking plate of the present invention. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] Example 1 See Figure 1-10A device for testing the low-temperature fluidity of asphalt includes a test platform 1, a temperature regulating pot 2 for placing asphalt on the test platform 1, a fixed frame 3 fixedly connected to the top of the test platform 1, a rotating frame 4 rotatably connected to the top of the fixed frame 3, a U-shaped frame 5 at the bottom of the rotating frame 4 relative to the position above the temperature regulating pot 2, an installation sleeve 6 fixedly connected to the bottom of the U-shaped frame 5, a sliding rod 7 on the inner side of the U-shaped frame 5, the bottom end of the sliding rod 7 passing through the bottom end of the installation sleeve 6, a test head 8 below the sliding rod 7, an electromagnet 9 fixedly connected to the inner bottom of the U-shaped frame 5 relative to the position next to the sliding rod 7, an upper electric telescopic cylinder 10 fixedly connected to the top of the rotating frame 4, the output end of the upper electric telescopic cylinder 10 passing through the top of the rotating frame 4 and fixedly connected to the top of the U-shaped frame 5, a locking mechanism for locking the position of the test head 8 below the sliding rod 7, a placement frame 11 fixedly connected to the top of the test platform 1, and an unlocking mechanism for releasing the locking mechanism. This embodiment covers the overall architecture of the device. The temperature regulating pot simulates a low-temperature environment, the rotating frame and related drive structure realize the position adjustment of the test head, the locking and unlocking mechanism ensures the replacement operation of the test head, and the position sensor is used for precise positioning. It solves the problems of inconvenient test head replacement and test interference in existing devices, and provides a stable and reliable basic structure for asphalt low-temperature fluidity testing.

[0022] In a specific example, the slide bar 7 is made of a material that can be attracted by the electromagnet 9. A pair of upper position sensors 12 are fixedly connected to the outer wall of the slide bar 7, a lower position sensor 13 is fixedly connected to the inner side of the U-shaped frame 5, a lower electric telescopic cylinder 14 is fixedly connected through the bottom end of the U-shaped frame 5, a top plate 16 is fixedly connected to the top end of the slide bar 7, and a push block 15 is fixedly connected to the output end of the lower electric telescopic cylinder 14 relative to the position below the top plate 16. This embodiment specifies the materials used for the sliding rod and the electromagnet. By setting up the lower electric telescopic cylinder, the top plate, and the push block, the automatic lifting and lowering control of the sliding rod is realized. Compared with manual operation, the automation level and efficiency of the test are improved, and the problem of inconvenient operation of the sliding rod during the test is solved.

[0023] In a specific example, the test head 8 has a U-shaped cooling cavity 33 inside, and the slide rod 7 has a pair of connecting cavities 34 inside. The bottom of the slide rod 7 is fixedly connected to a conical sealing block 35 for insertion into the U-shaped cooling cavity 33 at a position below the connecting cavity 34. The top of the rotating frame 4 is fixedly connected to a low-temperature air cooler 37, and the top of the connecting cavity 34 is fixedly connected to a flexible hose 36. The flexible hose 36 is used to avoid obstructing the up and down sliding of the slide rod 7 and affecting the normal testing of the device. The other end of the flexible hose 36 is fixedly connected to the inlet and outlet of the low-temperature air cooler 37 respectively. This embodiment features a unique test head cooling structure. Cold air is introduced into the U-shaped cooling chamber through a low-temperature cold air fan via a hose and connecting cavity to pre-cool the test head, bringing its temperature close to the low-temperature asphalt test temperature. This avoids the test head's own temperature affecting the test results and improves the accuracy of the test.

[0024] It should be noted that during the low-temperature fluidity test of asphalt, the asphalt is first placed in the temperature regulating pot 2 for cooling treatment. At the same time, the low-temperature cold air fan 37 is started to generate cold air that enters the U-shaped cooling chamber 33 through the hose 36, the connecting cavity 34 and the conical sealing block 35 to cool the test head 8. After reaching the specified temperature, the upper electric telescopic cylinder 10 is started to drive the U-shaped frame 5 to move down, and at the same time, the slide rod 7 and the test head 8 are moved down, so that the bottom of the test head 8 is close to the surface of the asphalt to be tested. Then, the electromagnet 9 is deactivated, losing its magnetic force and releasing the fixation of the slide rod 7, allowing the slide rod 7 and test head 8 to fall freely. During this process, when the upper position sensor 12 at the bottom of the slide rod 7 passes the lower position sensor 13, the control system starts timing. Subsequently, when the upper position sensor 12 passes the lower position sensor 13, a signal is detected and transmitted to the controller, which stops the timer. The flowability of the asphalt under low temperature conditions can be calculated. Finally, after the test is completed, the lower electric telescopic cylinder 14 is activated to drive the push block 15 to move upward, thereby pushing the top plate 16, slide rod 7, and test head 8 upward to reset. Once they reach the initial position, the electromagnet 9 can be energized to attract and fix the slide rod 7, thus realizing the low temperature flowability test of asphalt.

[0025] In practical use, it has been found that when using current asphalt fluidity testing devices, different specifications of test heads 8 need to be replaced when higher accuracy or different testing standards are required. However, most asphalt low-temperature fluidity testing devices require manual disassembly and assembly by operators when replacing the test head 8. This process is not only cumbersome and time-consuming, but also, in low-temperature testing environments, the temperature of the test head 8 is usually low. It is often necessary to wait for the temperature of the test head 8 to rise to near room temperature before disassembly and replacement can be performed. This waiting process not only prolongs the testing cycle, but may also cause fluctuations in the testing environment temperature, thus affecting the accuracy of the test results. To solve the above problems, the following structure has been invented.

[0026] In the specific implementation, a rotary motor 32 is fixedly connected to the top of the fixed frame 3, and the output end of the rotary motor 32 passes through the fixed frame 3 and is fixedly connected to the bottom of the rotary frame 4. This embodiment uses a rotary motor to drive the rotating frame, enabling the test components to switch quickly between different workstations, such as moving from above the temperature control pot to above the placement rack for test head replacement. This greatly improves the continuity and convenience of the testing process and solves the problem of low efficiency in manual position switching in traditional devices.

[0027] In the specific implementation, the locking mechanism includes a locking plate 39, which is provided with a pair. The top of the test head 8 has a pair of top grooves 17. An L-shaped plate 18 is slidably connected in the top groove 17. Several upper right-angle blocks 19 with inclined surfaces are fixedly connected at equal intervals on the inner side of the L-shaped plate 18. A pair of upper springs 20 are fixedly connected between the inner side of the top groove 17 and the side wall of the L-shaped plate 18. The locking plate 39 is fixedly connected to the bottom of the slide rod 7 and is located above the inner side of the L-shaped plate 18. The locking plate 39 has a groove 21 on the side close to each other. Lower right-angle blocks 22 with inclined surfaces are slidably connected in the inner side of the groove 21. A pair of lower springs 23 are fixedly connected in the inner side of the groove 21. The locking mechanism in this embodiment is ingeniously designed. By utilizing the inclined surfaces of the upper and lower right-angle blocks and the elastic force of the spring, a reliable connection between the test head and the slide bar is achieved. This ensures that the test head will not loosen during the test, guarantees the accuracy of the test results, and solves the problem of unstable test head connection in existing devices.

[0028] In the specific implementation, the side wall of the lower right-angle block 22 is fixedly connected to the limiting plate 24. By setting the limiting plate 24, the lower right-angle block 22 can be prevented from sliding out from the inside of the groove 21, thereby improving the stability of the device during operation. The other end of the lower spring 23 is fixedly connected to the side wall of the limiting plate 24, and the inclined surface of the lower right-angle block 22 is in contact with the inclined surface of one of the upper right-angle blocks 19. The limiting plate in this embodiment further optimizes the movement of the lower right-angle block, prevents it from moving excessively, ensures stable contact between the lower and upper right-angle blocks, enhances the reliability and stability of the locking mechanism, and improves the overall performance of the device.

[0029] In a specific implementation, the unlocking mechanism includes an unlocking electric telescopic cylinder 25, and a pair of unlocking electric telescopic cylinders 25 are provided. The top of the placement frame 11 is provided with a placement plate 26. The top of the placement plate 26 is provided with several placement slots 38 that are adapted to the test head 8 at equal intervals. The inner side of the placement slots 38 is provided with four slots 27 at equal intervals. The outer wall of the test head 8 is fixedly connected with four inserts 28 that are adapted to the slots 27 at equal intervals. The top of the placement frame 11 is fixedly connected with a side plate 29. The unlocking electric telescopic cylinders 25 are all fixedly connected to the side wall of the side plate 29. The output end of the unlocking electric telescopic cylinder 25 passes through the side plate 29 and is fixedly connected with an unlocking block 30. The bottom of the placement frame 11 is fixedly connected with a pushing electric telescopic cylinder 40. The bottom of the placement plate 26 is fixedly connected with a lower plate 41. The output end of the pushing electric telescopic cylinder 40 is fixedly connected to the side wall of the lower plate 41. The unlocking mechanism in this embodiment achieves automatic unlocking and replacement of the test head through the coordinated operation of multiple components. The placement slots and grooves on the placement plate cooperate with the test head insertion blocks to facilitate the placement and positioning of the test head. Pushing the electric telescopic cylinder can switch the position of different test heads, and unlocking the electric telescopic cylinder drives the unlocking block to release the lock, which greatly improves the efficiency and automation of test head replacement.

[0030] In the specific implementation, the top groove 17 is provided with a straight groove through the side away from the top groove, and the side wall of the L-shaped plate 18 is fixedly connected with a push rod 31 relative to the position inside the straight groove; In this embodiment, the cooperation between the push rod and the straight groove provides an operating interface for the unlocking mechanism. When it is necessary to replace the test head, the push rod can be pushed by an external mechanism to move the L-shaped plate and thus release the locking state, improving the convenience of test head replacement.

[0031] In a specific implementation, the hose 36 is made of a low-temperature resistant elastic material, and a spiral metal protective sleeve is fitted on the outside of the hose 36 to prevent the hose from being damaged during frequent expansion and contraction. In this embodiment, the low-temperature resistant elastic material ensures that the hose can work normally in low-temperature environments, while the spiral metal protective sleeve enhances the hose's durability, preventing it from being damaged due to frequent expansion and contraction during device operation, thus extending the device's service life and reducing maintenance costs. In a specific implementation, a temperature sensor is provided inside the temperature regulating pot 2, and an insulation layer is wrapped around the outer wall of the temperature regulating pot 2. A heating wire and a cooling plate are provided inside the insulation layer to accurately control the temperature of the asphalt inside the pot. In this embodiment, the temperature sensor monitors the temperature of the asphalt inside the temperature regulating pot in real time. Based on the feedback from the temperature sensor, the heating wire and cooling plate precisely adjust the asphalt temperature. The insulation layer reduces heat loss, ensuring that the temperature regulating pot can stably provide the required low-temperature testing environment for the asphalt and improving the reliability of the test results.

[0032] When different specifications of test heads 8 need to be replaced according to testing requirements, first place the various specifications of test heads 8 in the placement slot 38 in sequence (leave an empty placement slot 38 so that the test head 8 can be taken out from the slide bar 7 later). Then, control the rotary motor 32 to start and drive the rotary frame 4 to rotate, thereby rotating the U-shaped frame 5, slide bar 7 and test head 8 to the empty placement slot 38. Then, control the upper electric telescopic cylinder 10 to start and drive the U-shaped frame 5 to move down, inserting the test head 8 into the placement slot 38. At the same time, insert the insertion block 28 into the corresponding slot 27 to initially limit the position of the test head 8. Then, control the unlocking electric telescopic cylinder 25 to start and drive the unlocking block 30 to move. Then, the unlocking block 30 squeezes the push rod 31 to drive the L-shaped plate 18 to slide in the top slot 17. At the same time, gradually compress the upper spring 20 and gradually drive the upper right-angle block 19 to move out from the lower right-angle block 22. Then, the upper right-angle block 19 slides out completely from the lower right-angle block 22, releasing the restriction on the upward sliding of the locking plate 39. Then, the upper electric telescopic cylinder 10 can be controlled to start, driving the U-shaped frame 5 and the slide rod 7 to move upward, while simultaneously pulling the locking plate 39 out of the top groove 17 on the test head 8. Next, the unlocking electric telescopic cylinder 25 can be controlled to start and reset, and then the pushing electric telescopic cylinder 40 can be controlled to start, driving the lower plate 41 and the placement plate 26 to move. The test head 8 to be replaced is moved below the slide rod 7. Then, the upper electric telescopic cylinder 10 can be controlled to start, driving the slide rod 7 and the locking plate 39 to move downward and insert into the top groove 17. During this process, when the lower right-angle block 22 on the locking plate 39 moves above the upper right-angle block 19, the inclined surface of the upper right-angle block 19 will compress... The inclined surface of the lower right-angle block 22 causes the lower right-angle block 22 to be pressed into the groove 21 and compress the lower spring 23. Then, when the lower right-angle block 22 moves out from the side of the upper right-angle block 19 and the compression is released, it will be pushed back to its original position by the elastic force of the lower spring 23 and fit against the inclined surface of the lower upper right-angle block 19. This process is repeated until the conical sealing block 35 is tightly inserted into the top of the U-shaped cooling cavity 33. Since the lower right-angle block 22 is inserted between the upper right-angle blocks 19 at this time, the plane at the top of the lower right-angle block 22 will contact the plane at the bottom of the upper right-angle block 19, thereby restricting the upward sliding position of the lower right-angle block 22 and thus achieving a tight connection between the two. Finally, by controlling the upper electric telescopic cylinder 10 to rise and reset, the rotary motor 32 can be controlled to reverse and reset, and then the asphalt fluidity can be tested, thereby realizing the automatic replacement of the test head 8.

[0033] In summary, through the design of the above structure, the test head 8 can be transferred to the placement rack 11 first, and then the test head 8 can be placed in the placement slot 38 by the upper electric telescopic cylinder 10. Then, the locking between the test head 8 and the slide rod 7 can be released by the unlocking electric telescopic cylinder 25, and then the upper electric telescopic cylinder 10 can move the slide rod 7 away, thereby realizing the automatic unlocking between the test head 8 and the slide rod 7. Then, another test head 8 can be moved to the bottom of the slide rod 7 and inserted by the upper electric telescopic cylinder 10, thereby locking the two together and realizing the automatic replacement of the test head 8, which greatly improves the convenience of the device.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An apparatus for testing the low-temperature fluidity of asphalt, characterized in that, The test includes a test bench (1), on which a temperature regulating pot (2) for placing asphalt is provided. A fixed frame (3) is fixedly connected to the top of the test bench (1), and a rotating frame (4) is rotatably connected to the top of the fixed frame (3). A U-shaped frame (5) is provided at the bottom of the rotating frame (4) relative to the top of the temperature regulating pot (2). An installation sleeve (6) is fixedly connected to the bottom of the U-shaped frame (5). A sliding rod (7) is provided inside the U-shaped frame (5). The bottom of the sliding rod (7) passes through the bottom of the installation sleeve (6). A test head (8) is provided below the sliding rod (7). The bottom of the inner side of the U-shaped frame (5) is next to the sliding rod (7). An electromagnet (9) is fixedly connected to the position. An upper electric telescopic cylinder (10) is fixedly connected to the top of the rotating frame (4). The output end of the upper electric telescopic cylinder (10) passes through the top of the rotating frame (4) and is fixedly connected to the top of the U-shaped frame (5). A locking mechanism for locking the position of the test head (8) is provided below the slide rod (7). A placement frame (11) is fixedly connected to the top of the test platform (1). An unlocking mechanism for releasing the locking mechanism limit is provided on the placement frame (11). A pair of upper position sensors (12) are fixedly connected to the outer wall of the slide rod (7). A lower position sensor (13) is fixedly connected to the inner side of the U-shaped frame (5).

2. The apparatus for testing the low-temperature fluidity of asphalt according to claim 1, characterized in that, The slide bar (7) is made of a material that can be attracted by an electromagnet (9). The bottom end of the U-shaped frame (5) is fixedly connected to a lower electric telescopic cylinder (14). The top end of the slide bar (7) is fixedly connected to a top plate (16). The output end of the lower electric telescopic cylinder (14) is fixedly connected to a push block (15) at a position below the top plate (16).

3. The apparatus for testing the low-temperature fluidity of asphalt according to claim 1, characterized in that, A rotary motor (32) is fixedly connected to the top of the fixed frame (3), and the output end of the rotary motor (32) passes through the fixed frame (3) and is fixedly connected to the bottom of the rotary frame (4).

4. The apparatus for testing the low-temperature fluidity of asphalt according to claim 1, characterized in that, The locking mechanism includes a locking plate (39), a pair of locking plates (39) are provided, a pair of top grooves (17) are provided at the top of the test head (8), an L-shaped plate (18) is slidably connected in the top groove (17), a number of upper right-angle blocks (19) with inclined surfaces are fixedly connected at equal intervals on the inner side of the L-shaped plate (18), a pair of upper springs (20) are fixedly connected between the inner side of the top groove (17) and the side wall of the L-shaped plate (18), the locking plate (39) is fixedly connected to the bottom end of the slide rod (7), and the locking plate (39) is located above the inner side of the L-shaped plate (18), a groove (21) is provided on the side of the locking plate (39) that is close to each other, a lower right-angle block (22) with an inclined surface is slidably connected on the inner side of the groove (21), and a pair of lower springs (23) are fixedly connected on the inner side of the groove (21).

5. The apparatus for testing the low-temperature fluidity of asphalt according to claim 4, characterized in that, The lower right-angle block (22) is fixedly connected to the side wall of the limiting plate (24), and the other end of the lower spring (23) is fixedly connected to the side wall of the limiting plate (24). The inclined surface of the lower right-angle block (22) is in contact with the inclined surface of one of the upper right-angle blocks (19).

6. The apparatus for testing the low-temperature fluidity of asphalt according to claim 4, characterized in that, The top groove (17) is provided with a straight groove on the side away from each other, and the side wall of the L-shaped plate (18) is fixedly connected with a push rod (31) relative to the position inside the straight groove.

7. The apparatus for testing the low-temperature fluidity of asphalt according to claim 1, characterized in that, The unlocking mechanism includes an unlocking electric telescopic cylinder (25), and a pair of unlocking electric telescopic cylinders (25) are provided. The top of the placement frame (11) is provided with a placement plate (26). The top of the placement plate (26) is provided with several placement slots (38) that are adapted to the test head (8) at equal intervals. The inner side of the placement slots (38) is provided with four slots (27) at equal intervals. The outer wall of the test head (8) is fixedly connected with four plugs (28) that are adapted to the slots (27) at equal intervals. The top of the placement frame (11) is fixedly connected with a side plate (29). The unlocking electric telescopic cylinders (25) are all fixedly connected to the side wall of the side plate (29). The output end of the unlocking electric telescopic cylinder (25) passes through the side plate (29) and is fixedly connected with an unlocking block (30). The bottom end of the placement frame (11) is fixedly connected with a pushing electric telescopic cylinder (40). The bottom end of the placement plate (26) is fixedly connected with a lower plate (41). The output end of the pushing electric telescopic cylinder (40) is fixedly connected to the side wall of the lower plate (41).

8. The apparatus for testing the low-temperature fluidity of asphalt according to claim 1, characterized in that, The test head (8) has a U-shaped cooling cavity (33) inside, and the slide rod (7) has a pair of connecting cavities (34) inside. The bottom of the slide rod (7) is fixedly connected to a conical sealing block (35) for insertion into the U-shaped cooling cavity (33) at a position below the connecting cavity (34). The top of the rotating frame (4) is fixedly connected to a low-temperature air cooler (37). The top of the connecting cavity (34) is fixedly connected to a hose (36). The other end of the hose (36) is fixedly connected to the inlet and outlet of the low-temperature air cooler (37).

9. The apparatus for testing the low-temperature fluidity of asphalt according to claim 8, characterized in that, The hose (36) is made of low-temperature resistant elastic material, and a spiral metal protective sleeve is fitted on the outside of the hose (36) to prevent the hose from being damaged during frequent expansion and contraction.

10. The apparatus for testing the low-temperature fluidity of asphalt according to claim 1, characterized in that, The temperature regulating pot (2) is equipped with a temperature sensor on the inside and an insulation layer on the outer wall of the temperature regulating pot (2). The insulation layer is equipped with heating wires and cooling plates on the inside to accurately control the temperature of the asphalt inside the pot.

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