A high and low temperature performance testing device for asphalt mixture
By designing a test device that can be raised, lowered, and laterally slid, and by using a bonding plate and ball bearings to reduce friction, the wear problem of asphalt mixture test devices was solved, and efficient high and low temperature performance testing was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG EXPRESSWAY MAINTENANCE CO LTD
- Filing Date
- 2025-07-30
- Publication Date
- 2026-06-26
AI Technical Summary
Existing asphalt mixture testing equipment is prone to wear and tear on its components when rubbing against the asphalt surface, affecting the reliability and repeatability of test data.
A test device capable of lifting and sliding laterally was designed. It avoids direct contact between the tester and the asphalt surface by having a bonding plate in contact with the asphalt surface and bearing sliding friction. Ball bearings are used to reduce friction, and the combination of slider and connecting structure adapts to uneven surfaces to ensure test accuracy.
It effectively avoids wear and tear on the testing instrument, improves the reliability and repeatability of the test, reduces equipment maintenance costs, and ensures the accuracy of test data.
Smart Images
Figure CN224416773U_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of asphalt performance testing technology, specifically to a high and low temperature performance testing device for asphalt mixtures. Background Technology
[0002] Extensive research and engineering practice have shown that low-temperature shrinkage cracking of asphalt pavements is a significant problem encountered after the asphalt mixture is laid and compacted. The low-temperature performance of asphalt mixtures directly reflects their resistance to thermal shrinkage cracking; therefore, testing methods for obtaining the high and low temperature performance of asphalt mixtures are particularly important.
[0003] On March 25, 2022, a device and method for testing the high and low temperature performance of asphalt mixtures were authorized and disclosed, with authorization publication number CN114235884A. The device includes a mold, a displacement transmission device, and a measuring device. Both the displacement transmission device and the measuring device are mounted on the mold. The mold includes a base plate, side plates, and end plates. The side plates are fixed to the base plate and have slots. The end plates are inserted into the slots. The base plate, side plates, and end plates form a lidless box-like structure. The displacement transmission device includes a contact plate, a connecting rod, and an outer plate. The contact plate is located inside the mold and is connected to the outer plate via the connecting rod, which passes through the end plate. The measuring device includes an insert plate and a dial indicator. The insert plate is fixed to the base plate, and the dial indicator is mounted on the insert plate. The dial indicator's probe is connected to the outer plate. This device can effectively test the performance of asphalt mixtures at different temperatures.
[0004] However, in the process of asphalt mixture testing, the measuring device is usually kept in close contact with the asphalt surface to obtain performance data. The friction between the equipment and the asphalt surface cannot be ignored. Under long-term operation, friction will not only lead to increased wear of equipment parts, thus causing deviations in test data, but the rough and uneven characteristics of the asphalt surface will further amplify this wear effect, accelerate the wear of key equipment components, such as the contact probe and displacement sensor contacts, and in severe cases may lead to failure of the equipment's mechanical structure or deterioration of measurement accuracy, affecting the reliability and repeatability of asphalt mixture performance testing. Utility Model Content
[0005] Therefore, in view of the above problems, this utility model proposes a high and low temperature performance testing device for asphalt mixtures that can avoid wear on the test end of the testing instrument.
[0006] This utility model is achieved through the following technical solution.
[0007] A high and low temperature performance testing device for asphalt mixtures includes a housing, within which a placement box for holding the asphalt mixture is provided. A testing device is mounted on the upper side of the placement box. The testing device is configured to be vertically raised and lowered and horizontally slidable to test the asphalt mixture. The testing device includes a testing body, within which a testing instrument is disposed. The testing end of the testing instrument faces the placement box. Adhesive plates are provided on both sides of the testing body, with the lower end of the adhesive plates used to adhere to the surface of the asphalt mixture. The adhesive plates are vertically raised and lowered on both sides of the testing body, and are configured such that their lower ends remain below the lower end of the testing end of the testing instrument during the raising and lowering process.
[0008] As a further improvement of this utility model, the side wall of the test body is provided with a plurality of sliding grooves extending vertically, and a slider is provided on one side of the bonding plate, the slider being slidably fitted into the sliding groove.
[0009] As a further improvement of this utility model, multiple bonding plates are provided, and each bonding plate is connected to the others, and adjacent bonding plates can slide relative to each other in the vertical direction.
[0010] As a further improvement of this utility model, a connecting groove is provided on one side of the bonding plate, and a connecting strip adapted to it is provided on the other side of the bonding plate. The connecting strip can be inserted vertically into the connecting groove of the adjacent bonding plate.
[0011] As a further improvement of this utility model, the connecting strip includes a connecting part connected to the side wall of the bonding plate and an arc-shaped limiting part connected to the other side of the connecting part.
[0012] As a further improvement of this utility model, the bottom of the bonding plate is provided with ball bearings.
[0013] As a further improvement of this utility model, the test body is provided with a mounting base, the tester is provided with an insert plate, the upper end of the insert plate passes through the test body and enters the mounting base, and the mounting base is provided with a fixing structure for fixing the insert plate.
[0014] As a further improvement of this utility model, the fixing structure includes a pull rod disposed in the mounting base, one end of the pull rod passing through the mounting base, and a fixing plate disposed at the other end of the pull rod. An elastic element is disposed between the fixing plate and the inner wall of the mounting base to drive the fixing plate to clamp the insert plate inserted into the mounting base.
[0015] As a further improvement of this utility model, a rotating lead screw is provided on the box body and inserted into the box body. A rotation drive device is provided on the box body and drivenly connected to the rotating lead screw. A sliding seat is drivenly connected to the rotating lead screw. The testing device is located below the sliding seat. A guide rod is provided inside the box body. The guide rod is arranged parallel to the rotating lead screw and passes through the sliding seat.
[0016] As a further improvement of this utility model, an electric telescopic rod is provided on the lower side of the sliding seat, and the testing device is fixedly installed at the lower end of the electric telescopic rod.
[0017] The beneficial effects of this utility model are as follows: In this utility model, the lower end of the bonding plate is always lower than the test end of the tester, so that the lower end surface of the bonding plate first contacts the surface of the asphalt mixture and bears sliding friction, so that the tester and the surface of the asphalt mixture are kept in a non-direct contact state, effectively avoiding the wear problem of the tester caused by direct friction. Attached Figure Description
[0018] The preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of this utility model, wherein:
[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;
[0020] Figure 2 This is a schematic diagram of the internal structure of the box in an embodiment of this utility model;
[0021] Figure 3 This is a schematic diagram of the test body structure in an embodiment of this utility model;
[0022] Figure 4 This is a schematic diagram of the bonding plate structure in an embodiment of the present utility model;
[0023] Figure 5 This is a schematic diagram of the internal structure of the test subject in an embodiment of this utility model;
[0024] Figure 6 Corresponding to the embodiments of this utility model Figure 5 Enlarged view of a portion of point A in the middle.
[0025] The following are the numbered components in the diagram: 1. Box body; 2. Placement box; 3. Test body; 4. Tester; 5. Adhesive plate; 6. Sliding groove; 7. Sliding block; 8. Connecting groove; 9. Connecting strip; 901. Connecting part; 902. Arc-shaped limiting part; 10. Ball bearing; 11. Mounting seat; 12. Insert plate; 13. Pull rod; 14. Fixing plate; 15. Elastic element; 16. Rotating motor; 17. Guide rod; 18. Sliding seat; 19. Electric telescopic rod. Detailed Implementation
[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.
[0027] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.
[0028] refer to Figures 1 to 6 The present utility model embodiment discloses that:
[0029] A high and low temperature performance testing device for asphalt mixtures includes a housing 1, within which a placement box 2 for holding asphalt mixtures is provided. A testing device is mounted on the upper side of the placement box 2. The testing device is configured to be vertically raised and lowered and horizontally slidable to test the asphalt mixture. The testing device includes a testing body 3, within which a testing instrument 4 is disposed. The testing end of the testing instrument 4 faces the placement box 2. Adhesive plates 5 are provided on both sides of the testing body 3, with the lower end of the adhesive plates 5 used to adhere to the surface of the asphalt mixture. The adhesive plates 5 are vertically raised and lowered on both sides of the testing body 3, and are configured such that their lower ends are always lower than the lower end of the testing end of the testing instrument 4 during the raising and lowering process. In this embodiment, the lower end of the adhesive plates 5 is always lower than the testing end of the testing instrument 4, allowing the adhesive plates 5 to preferentially contact the surface of the asphalt mixture and withstand sliding friction. This ensures that the testing instrument 4 maintains a non-direct contact with the surface of the asphalt mixture, effectively avoiding wear problems caused by direct friction of the testing instrument 4.
[0030] The test body 3 has several vertically extending sliding grooves 6 on its side wall, and a slider 7 is provided on one side of the bonding plate 5. The slider 7 is slidably fitted into the sliding grooves 6. The sliding grooves 6 and the slider 7 cooperate to realize the vertical movement of the bonding plate 5 and prevent its lateral displacement. At the same time, the mechanical sliding groove structure is durable and has low maintenance costs, making it suitable for test environments with alternating high and low temperatures, and avoiding jamming of complex mechanisms due to temperature changes.
[0031] Multiple bonding plates 5 are provided, and each bonding plate 5 is interconnected. Adjacent bonding plates 5 can slide relative to each other in the vertical direction. Multiple interconnected bonding plates 5 can independently adapt to the local unevenness of the asphalt surface, achieve uniform bonding over a larger area, reduce test deviations caused by local unevenness, and the multiple bonding plates 5 contact the surface in different areas to avoid excessive wear at a single point and extend the overall service life of the bonding plates 5.
[0032] The bonding plate 5 has a connecting groove 8 on one side and a connecting strip 9 adapted to it on the other side. The connecting strip 9 can be inserted vertically into the connecting groove 8 of the adjacent bonding plate 5. Specifically, the connecting strip 9 includes a connecting part 901 connected to the side wall of the bonding plate 5 and an arc-shaped limiting part 902 connected to the other side of the connecting part 901. The insertion design of the connecting groove 8 and the connecting strip 9 allows the bonding plates 5 to slide relative to each other vertically, ensuring that multiple bonding plates 5 can still rise and fall independently with the terrain after being combined.
[0033] The bottom of the bonding plate 5 is provided with ball bearings 10. When the bonding plate 5 contacts the asphalt mixture, the ball bearings 10 convert the sliding friction between the bonding plate 5 and the surface of the asphalt mixture into rolling friction, reducing movement resistance and wear, protecting the surface structure of the asphalt mixture from being scratched, and ensuring that the test data truly reflects the material performance.
[0034] The test body 3 is provided with a mounting base 11, and the test instrument 4 is provided with an insert plate 12. The upper end of the insert plate 12 passes through the test body 3 and is inserted into the mounting base 11. The mounting base 11 is provided with a fixing structure for fixing the insert plate 12. The fixing structure includes a pull rod 13 disposed in the mounting base 11. One end of the pull rod 13 passes through the mounting base 11 and is connected to a handle. The other end of the pull rod 13 is provided with a fixing plate 14. An elastic element 15 is disposed between the fixing plate 14 and the inner wall of the mounting base 11 for use in... The fixed plate 14 is driven to clamp the insert plate 12 inserted into the mounting base 11. Specifically, the elastic element 15 is a compression spring, which is sleeved on the pull rod 13. The two ends of the compression spring abut against the fixed plate 14 and the inner wall of the mounting base 11, respectively. During installation, the insert plate 12 on the tester 4 is inserted into the mounting base 11 by controlling the tester 4, and then the elastic element 15 cooperates with the fixed plate 14 to realize the installation and fixation of the tester 4. The structure is simple and the installation is convenient. It is convenient for quick disassembly during equipment maintenance and improves the portability of the overall installation process.
[0035] The housing 1 is provided with a rotating lead screw that passes through the interior of the housing 1. The housing 1 is also provided with a rotation drive device that is pulsatingly connected to the rotating lead screw. The rotation drive device is a rotating motor 16. A sliding seat 18 (through threaded connection) is pulsatingly connected to the rotating lead screw. By controlling the rotation of the rotating lead screw, the sliding seat 18 is moved within the housing 1. In this embodiment, the testing device is located below the sliding seat 18, which enables the lateral sliding of the testing device. A guide rod 17 is provided inside the housing 1. The guide rod 17 is parallel to the rotating lead screw and passes through the sliding seat 18.
[0036] An electric telescopic rod 19 is provided on the lower side of the sliding seat 18. The testing device is fixedly installed at the lower end of the electric telescopic rod 19. By controlling the extension and retraction of the electric telescopic rod 19, the testing device can be driven to move vertically up and down. The structure is simple and the operation is convenient.
[0037] It is worth noting that the tester 4 in this embodiment is an existing structure, which is configured to detect the deformation characteristics of asphalt mixtures under high and low temperature conditions. The test device provided in the authorized publication CN114235884B can be used to detect the deformation characteristics of asphalt mixtures under high and low temperature conditions. However, this application can perform high and low temperature tests without avoiding wear on the tester 4.
[0038] Working principle:
[0039] First, the asphalt material is evenly spread inside the placement box 2. Then, the tester 4 is placed into the test body 3, with its insert plate 12 inserted into the mounting base 11. The fixing plate 14 is fixed to the insert plate 12 by the elastic force of the elastic element 15 (compression spring), thus realizing the installation of the tester 4. Then, the electric telescopic rod 19 is activated, causing the electric telescopic rod 19 to drive the test device (test body 3) to descend to the preset position. At this time, the lower end face of the bonding plate 5 and the ball bearing 10 are in contact with the surface of the asphalt mixture. Then, the rotating motor 16 is turned on, causing the rotating motor 16 to drive the sliding seat 18 to move, that is, to control the lateral sliding along the test device (test body 3), thereby driving the bonding plate 5 and the ball bearing 10 to move along the surface of the asphalt mixture. Of course, during the movement... The testing end of the tester 4 is used to test the asphalt mixture. When encountering uneven parts of the asphalt mixture, each bonding plate 5 automatically rises and falls within the sliding groove 6 via the slider 7. Since each bonding plate 5 is connected to the connecting groove 8 via the connecting strip 9 and hangs down by gravity, it can completely adhere to the surface of the asphalt mixture. Finally, the asphalt mixture is tested for high and low temperatures by the tester 4402. During this process, the lower end of the bonding plate 5 is always lower than the testing end of the tester 4 (that is, when the slider 7 rises to its uppermost position in the sliding groove 6 and touches the upper wall of the sliding groove 6, the lower end of the bonding plate 5 is still lower than the testing end of the tester 4, so that there is always a gap between the tester 4 and the surface of the asphalt mixture), thereby completing the high and low temperature test while avoiding wear on the tester 4.
[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A high and low temperature performance testing device for asphalt mixture, comprising a box (1), a placing box (2) for placing asphalt mixture is arranged in the box (1), a testing device is arranged on the upper side of the placing box (2), the testing device is configured to be vertically lifted and laterally slid to detect the asphalt mixture, characterized in that: The testing device includes a testing body (3), a testing instrument (4) is provided inside the testing body (3), the testing end of the testing instrument (4) faces the placement box (2), and bonding plates (5) are provided on both sides of the testing body (3). The lower end of the bonding plate (5) is used to bond with the surface of the asphalt mixture; wherein, the bonding plate (5) is vertically and vertically arranged on both sides of the testing body (3), and the bonding plate (5) is configured such that its lower end is always lower than the lower end of the testing end of the testing instrument (4) during the lifting process. 2. The high and low temperature performance testing device for asphalt mixture according to claim 1, characterized in that: The test body (3) has several sliding grooves (6) extending vertically on its side wall, and a slider (7) is provided on one side of the bonding plate (5), and the slider (7) slides into the sliding groove (6).
3. The device for testing high and low temperature performance of asphalt mixture according to claim 2, characterized in that: Multiple bonding plates (5) are provided, and each bonding plate (5) is connected to the other, and adjacent bonding plates (5) can slide relative to each other in the vertical direction.
4. The device for testing high and low temperature performance of asphalt mixture according to claim 3, characterized in that: The bonding plate (5) has a connecting groove (8) on one side and a connecting strip (9) adapted to it on the other side. The connecting strip (9) can be inserted vertically into the connecting groove (8) of the adjacent bonding plate (5).
5. The device for testing high and low temperature performance of asphalt mixture according to claim 4, characterized in that: The connecting strip (9) includes a connecting part (901) connected to the side wall of the bonding plate (5) and an arc-shaped limiting part (902) connected to the other side of the connecting part (901).
6. The device for testing high and low temperature performance of asphalt mixture according to claim 1, characterized in that: The bottom of the bonding plate (5) is provided with ball bearings (10).
7. The device for testing high and low temperature performance of asphalt mixture according to claim 1, characterized in that: The test body (3) is provided with a mounting base (11), and the tester (4) is provided with a plug plate (12). The upper end of the plug plate (12) passes through the test body (3) and is inserted into the mounting base (11). The mounting base (11) is provided with a fixing structure for fixing the plug plate (12).
8. The device for testing high and low temperature performance of asphalt mixture according to claim 7, characterized in that: The fixing structure includes a pull rod (13) disposed in the mounting base (11), one end of the pull rod (13) protruding from the mounting base (11), and a fixing plate (14) disposed at the other end of the pull rod (13). An elastic element (15) is disposed between the fixing plate (14) and the inner wall of the mounting base (11) to drive the fixing plate (14) to clamp the insert plate (12) inserted into the mounting base (11).
9. The high and low temperature performance testing device for asphalt mixtures according to claim 1, characterized in that: The housing (1) is provided with a rotating lead screw that passes through the inside of the housing (1). The housing (1) is provided with a rotating drive device that is connected to the rotating lead screw. A sliding seat (18) is connected to the rotating lead screw. The testing device is located below the sliding seat (18). A guide rod (17) is provided inside the housing (1). The guide rod (17) is parallel to the rotating lead screw and passes through the sliding seat (18).
10. The high and low temperature performance testing device for asphalt mixtures according to claim 9, characterized in that: An electric telescopic rod (19) is provided on the lower side of the sliding seat (18), and the testing device is fixedly installed at the lower end of the electric telescopic rod (19).