An asphalt penetrometer
By introducing a linkage design between the positioning ring and the indicator needle into the asphalt penetration tester, the mechanized alignment process solves the visual error problem caused by manual alignment, thereby improving the accuracy and repeatability of the test.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUIZHOU EAST SUN DETECTION TECH CO LTD
- Filing Date
- 2025-08-22
- Publication Date
- 2026-07-21
AI Technical Summary
Existing asphalt penetration testers rely on manual observation during zeroing operations, which leads to visual errors that affect the accuracy and repeatability of the test.
The design employs a linkage between the positioning ring and the indicator needle, which ensures precise contact between the test needle tip and the surface of the asphalt sample through mechanical indication. Combined with a transparent chamber, magnetic fixation, and omnidirectional lighting, it reduces operational deviations.
This improved the accuracy and repeatability of test results, reduced the result bias between different operators, and ensured good reproducibility and comparability of experimental data.
Smart Images
Figure CN224535714U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of asphalt testing, and more specifically, to an asphalt penetration tester. Background Technology
[0002] Asphalt penetration is a key technical indicator for evaluating the hardness and consistency of asphalt and for classifying asphalt grades. Its measurement results directly affect the quality control of road asphalt and the design of mixture proportions. The current principle of asphalt penetration testers is to vertically penetrate an asphalt sample with a standard needle under the influence of a 100g weight within a specified temperature and time, and the penetration depth is expressed as the penetration value. Before each test, a crucial "zeroing" or "needle tip positioning" operation must be performed: ensuring that the tip of the test needle is precisely in contact with the upper surface of the asphalt sample below, serving as the starting zero point for the penetration depth. Currently, most existing instruments rely entirely on the operator's visual observation and personal experience to complete this step. However, this zeroing operation actually needs to be performed underwater, and the standard needle is prone to inaccurate alignment due to water refraction, thus affecting the accuracy of the test. Utility Model Content
[0003] In view of this, the present invention provides an asphalt penetration tester that can improve the accuracy of zero penetration.
[0004] The objective of this utility model is achieved through the following technical solution: An asphalt needle penetration tester includes a base, a column mounted on the base, a lifting seat slidably fitted onto the column, a test needle assembly and a needle tip positioning assembly mounted on the bottom of the lifting seat, and a placement chamber located on the base and below the test needle assembly. The needle tip positioning assembly includes a connecting plate located at the bottom of the lifting seat, a limiting member elastically slidably engaged on the connecting plate, and a positioning ring and an indicator needle connected to the limiting member. The positioning ring is located directly below the test needle assembly, and the indicator needle points towards the connecting plate. The connecting plate has a positioning mark, and when the indicator needle points towards the positioning mark, the needle tip of the test needle assembly is flush with the lower end face of the positioning ring.
[0005] In the above technical solution, the linkage design between the positioning ring and the indicator needle ensures that the test needle tip is perfectly flush with the lower end face of the positioning ring when the indicator needle is precisely aligned with the positioning mark on the connecting plate. This effectively avoids visual errors caused by traditional manual alignment, standardizes the initial contact position between the needle tip and the asphalt sample surface, and significantly improves the accuracy and repeatability of the test results. This design standardizes an operation process that relies on personal skills and experience into a simple and objective mechanical indication process. Different operators can operate according to the unified standard of "pointer alignment mark," effectively reducing the result deviation caused by different operators and ensuring good reproducibility and comparability of experimental data.
[0006] Optionally, in one possible implementation, the connecting plate includes a first plate and a second plate that are perpendicular to each other, the first plate being parallel to the moving direction of the lifting seat, the limiting member being engaged with the second plate, and the positioning mark being located on the first plate.
[0007] In the above technical solution, the design of the first plate being parallel to the moving direction of the lifting assembly ensures a linear guiding relationship between the movement trajectory of the connecting plate and the lifting seat, effectively eliminating the problem of inaccurate alignment caused by directional deviation during the lifting process. The positioning mark is located on the surface of the first plate and forms a perpendicular projection relationship with the indicator needle. The operator can simultaneously observe the alignment status of the indicator needle and the positioning mark from a single perspective, completing precise calibration without adjusting the observation angle.
[0008] Optionally, in one possible implementation, the limiting member includes a guide post movably inserted into the second plate, a first limiting block and a second limiting block located at both ends of the guide post, and an elastic member sleeved on the guide post; the elastic member abuts against the lower end face of the second plate and the second limiting block, the positioning ring is connected to one side of the second limiting block, and the indicator needle is disposed on the first limiting block.
[0009] In the above technical solution, the elastic element sleeved on the guide post forms a dynamic buffer system by abutting against the second plate and the second limiting block. When the lifting platform is running, the elastic element can absorb mechanical vibration and impact force, preventing the positioning ring from shifting due to instantaneous overload and improving positioning accuracy. The positioning ring and the indicator needle are fixed to the second limiting block and the first limiting block, respectively, and are rigidly connected by the guide post. When the operator adjusts the position of the limiting element, the movement trajectory of the positioning ring and the indicator needle can be strictly synchronized.
[0010] Alternatively, in one possible implementation, the lower end face of the positioning ring is lower than the lower end face of the second limiting block.
[0011] In the above technical solution, the design of the lower end face of the positioning ring being lower than the second limiting block makes the positioning ring the only guiding structure before the test needle contacts the surface of the asphalt sample. During the descent of the lifting platform, the positioning ring contacts the sample surface before the second limiting block, and its lower end face serves as the initial positioning reference, which can completely eliminate the interference of the second limiting block on the sample surface, ensuring that the instantaneous state of the test needle tip contacting the sample is completely consistent with the actual test conditions, and significantly improving the authenticity of the test data.
[0012] Optionally, in one possible implementation, the test probe assembly includes a needle holder mounted on the bottom of the lifting seat and a test probe body detachably mounted on the needle holder, the test probe body passing through the inner ring of the positioning ring.
[0013] In the above technical solution, the detachable connection structure between the test needle body and the needle holder allows for quick replacement of test needles of different specifications to meet the differentiated requirements of different standards for asphalt penetration testing. The design of the test needle body passing through the inner ring of the positioning ring facilitates the disassembly and replacement of the test needle body, and also ensures that the positioning ring does not interfere with the movement of the test needle body, thereby guaranteeing the normal operation of the test needle body.
[0014] Optionally, in one possible implementation, the positioning mark includes two marker blocks spaced apart, the two marker blocks being spaced apart along the moving direction of the lifting seat, the distance between the two marker blocks being equal to the distance between the tip of the test needle body and the lower end face of the positioning ring.
[0015] In the above technical solution, the distance between the two marker blocks is strictly equal to the physical distance between the tip of the test needle and the lower end face of the positioning ring, forming a dual positioning reference of mechanical and visual means. When the lower marker block is aligned with the indicator needle, it indicates that the limiting component and the positioning ring have returned to their initial positions, thereby determining whether there is a deviation; when the upper marker block is aligned with the indicator needle, it ensures that the lower end face of the positioning ring and the tip of the test needle body are in exact contact with the sample surface.
[0016] Optionally, in one possible implementation, the placement chamber includes a transparent chamber with a top opening, a support platform placed inside the chamber, and a sample cup placed on the support platform, the sample cup being used to hold an asphalt sample.
[0017] In the above technical solution, the top opening design of the transparent chamber, combined with a high light transmittance material, provides operators with an unobstructed 360° viewing angle. Furthermore, the support platform and the transparent chamber are independently placed, allowing for quick replacement according to different testing needs.
[0018] Optionally, in one possible implementation, the support platform is suspended in the transparent chamber by several legs, the upper surface of the support platform is provided with magnetic and non-magnetic areas, and the sample cup has a magnetic structure, which can be adsorbed onto the magnetic area.
[0019] In the above technical solution, the support platform is suspended in the transparent chamber by its legs, effectively isolating the direct transmission of external vibrations to the sample cup. Combined with the directional adsorption of the magnetic sample cup by the magnetic zone, a dual stabilization mechanism of "physical vibration isolation and magnetic fixation" is formed. The clear division between the magnetic and non-magnetic zones allows the operator to automatically adsorb and position the sample cup simply by bringing it close to the magnetic zone, avoiding the problem of the sample cup shifting during the needle-punching process.
[0020] Optionally, in one possible implementation, the base is further provided with a lighting mechanism, which includes a universal tube and a light connected to the universal tube.
[0021] In the above technical solution, the flexible nature of the universal tube allows the lighting to be precisely positioned in any blind spot inside the transparent cabin, and the 360° flexible adjustment of the illumination angle eliminates the shadow interference caused by traditional fixed lighting. Attached Figure Description
[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the overall structure of one embodiment.
[0024] Figure 2 for Figure 1 Enlarged view of part A in the middle.
[0025] Figure 3 This is a top view of a limiting member in one embodiment.
[0026] Figure 4 This is a cross-sectional view of a placement compartment in one embodiment.
[0027] Reference numerals: 1-Base; 2-Column; 3-Lifting platform; 4-Test probe assembly; 41-Pin holder; 42-Test probe body; 5-Pin tip positioning assembly; 51-Connecting plate; 511-First plate; 512-Second plate; 52-Limiting component; 521-Guide post; 522-First limiting block; 523-Second limiting block; 524-Elastic component; 53-Positioning ring; 54-Indicator needle; 55-Positioning mark; 6-Placement chamber; 61-Transparent chamber; 62-Support platform; 621-Magnetic area; 622-Non-magnetic area; 63-Sample cup; 64-Feeder; 7-Lighting mechanism; 71-Universal tube; 72-Lighting lamp. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0030] Please refer to Figure 1 and Figure 2 This embodiment provides an asphalt needle penetration tester, including a base 1, a column 2 mounted on the base 1, a lifting seat slidably fitted on the column 2, a test needle assembly 4 and a needle tip positioning assembly 5 mounted on the bottom of the lifting seat, and a placement chamber 6 located on the base 1 and below the test needle assembly 4; the needle tip positioning assembly 5 includes a connecting plate 51 located at the bottom of the lifting seat, a limiting member 52 elastically slidably locked on the connecting plate 51, and a positioning ring 53 and an indicator needle 54 connected to the limiting member 52; the positioning ring 53 is located directly below the test needle assembly 4, and the indicator needle 54 points to the connecting plate 51; wherein, the connecting plate 51 is provided with a positioning mark 55, and when the indicator needle 54 points to the positioning mark 55, the needle tip of the test needle assembly 4 is flush with the lower end face of the positioning ring 53.
[0031] Specifically, the base 1 integrates a control system, and the column 2 has a hollow structure. The control system inside the base 1 is electrically connected to the lifting platform 3 via wires. The wires pass through the inside of the column 2 and connect to the lifting platform 3. The lifting platform 3 is designed with weights inside to provide additional load. When the instrument is running, the control system controls the weights to be applied to the top of the test needle assembly 4 so that the test needle assembly 4 penetrates the asphalt.
[0032] This embodiment utilizes a linkage design between the positioning ring 53 and the indicator needle 54. When the indicator needle 54 is precisely aligned with the positioning mark 55 on the connecting plate 51, it ensures that the test needle tip is strictly flush with the lower end face of the positioning ring 53. This effectively avoids visual errors caused by traditional manual alignment, standardizes the initial contact position between the needle tip and the asphalt sample surface, and significantly improves the accuracy and repeatability of test results. This design standardizes an operation process that relies on personal skills and experience into a simple and objective mechanical indication process. Different operators can operate according to a unified standard of "pointer alignment mark," effectively reducing the result deviation caused by different operators and ensuring good reproducibility and comparability of experimental data.
[0033] The method of use in this embodiment is as follows: Before testing, the sample to be tested is placed in the placement chamber 6, which is equipped with a water bath constant temperature system to keep the sample at a constant temperature. Then, the test needle assembly 4 is assembled so that the needle tip is above the positioning ring 53. Then, the position of the lifting platform 3 is adjusted to lower the platform. During the continuous descent of the lifting platform 3, the positioning ring 53 first contacts the surface of the sample to be tested. At this time, the lifting platform 3 continues to descend. Since the positioning ring 53 is already in contact with the sample to be tested, it cannot descend further. This causes the elastic element 524 to be compressed, causing the limiting element 52 to rise relative to the connecting plate 51. The position of the indicator needle 54 on the limiting element 52 pointing to the connecting plate 51 will change until the indicator needle 54 points to the preset positioning mark, at which point the lifting platform 3 stops descending. At this time, the needle tip of the test needle assembly 4 is exactly on the surface of the sample to be tested.
[0034] Please refer to Figure 2 In this embodiment, the connecting plate 51 includes a first plate 511 and a second plate 512 that are perpendicular to each other. The first plate 511 is parallel to the moving direction of the lifting platform, the limiting member 52 is engaged with the second plate 512, and the positioning mark 55 is located on the first plate 511. The first plate 511 and the second plate 512 are integrally molded structures with an "L" shape design. The first plate 511 is fixed to the bottom of the lifting platform 3 and rises and falls synchronously with the lifting platform 3.
[0035] The design of the first plate 511, parallel to the direction of movement of the lifting assembly, ensures a linear guiding relationship between the connecting plate 51 and the lifting seat's movement trajectory, effectively eliminating the problem of inaccurate alignment caused by directional deviation during lifting. The positioning mark 55 is located on the surface of the first plate 511, forming a perpendicular projection relationship with the indicator needle 54. The operator can simultaneously observe the alignment status of the indicator needle 54 and the positioning mark 55 from a single perspective, completing precise calibration without adjusting the viewing angle.
[0036] Please refer to Figure 1 and Figure 3 In this embodiment, the limiting member 52 includes a guide post 521 movably inserted into the second plate 512, a first limiting block 522 and a second limiting block 523 located at both ends of the guide post 521, and an elastic member 524 sleeved on the guide post 521. The elastic member 524 is a metal spring, which abuts against the lower end face of the second plate 512 and the second limiting block 523. A positioning ring 53 is connected to one side of the second limiting block 523, and an indicator needle 54 is located on the first limiting block 522. The first limiting block 522 is located at the upper end of the guide post 521, and the second limiting block 523 is located at the lower end of the guide post 521. The connection between the guide post 521 and the second plate 512 is a clearance fit, so that the guide post 521 will not shift during relative movement.
[0037] The elastic element 524 fitted on the guide post 521 forms a dynamic buffer system by abutting against the second plate 512 and the second limiting block 523. When the lifting platform 3 is running, the elastic element 524 can absorb mechanical vibration and impact force, preventing the positioning ring 53 from shifting due to instantaneous overload and improving positioning accuracy. The positioning ring 53 and the indicator needle 54 are respectively fixed to the second limiting block 523 and the first limiting block 522, forming a rigid connection through the guide post 521. When the operator adjusts the position of the limiting element 52, the movement trajectory of the positioning ring 53 and the indicator needle 54 can be strictly synchronized.
[0038] It should be noted that the lower end face of the positioning ring 53 is lower than the lower end face of the second limiting block 523. This design ensures that the positioning ring 53 is the sole guiding structure before the test needle contacts the asphalt sample surface. During the descent of the lifting platform 3, the positioning ring 53 contacts the sample surface before the second limiting block 523. Its lower end face serves as the initial positioning reference, completely eliminating interference from the second limiting block 523 on the sample surface. This ensures that the instantaneous state of the test needle tip in contact with the sample is completely consistent with the actual test conditions, significantly improving the accuracy of the test data.
[0039] Please refer to Figure 1In this embodiment, the test needle assembly 4 includes a needle holder 41 mounted on the bottom of the lifting seat and a test needle body 42 detachably mounted on the needle holder 41. The test needle body 42 can pass through the inner ring of the positioning ring 53.
[0040] The detachable connection structure between the test needle body 42 and the needle holder 41 allows for quick replacement of test needles of different specifications to meet the varying requirements of different standards for asphalt penetration testing. The design of the test needle body 42 passing through the inner ring of the positioning ring 53 facilitates the disassembly and replacement of the test needle body 42, while also ensuring that the positioning ring 53 does not interfere with the movement of the test needle body 42, thus guaranteeing its normal operation.
[0041] Please refer to Figure 2 In this embodiment, the positioning mark 55 includes two marker blocks spaced apart. The two marker blocks are spaced apart along the moving direction of the lifting seat, and the distance between the two marker blocks is equal to the distance between the tip of the test needle body 42 and the lower end face of the positioning ring 53. Alternatively, multiple marker blocks can be spaced apart, allowing for flexible selection of different reference marks for test needle bodies 42 of different lengths.
[0042] The distance between the two marker blocks is strictly equal to the physical distance between the tip of the test needle and the lower end face of the positioning ring 53, forming a dual positioning reference of mechanical and visual means. When the lower marker block is aligned with the indicator needle 54, it indicates that the limiting member 52 and the positioning ring 53 have returned to their initial positions, thereby determining whether there is a deviation. When the upper marker block is aligned with the indicator needle 54, it ensures that the lower end face of the positioning ring 53 and the tip of the test needle body 42 are in exact contact with the sample surface.
[0043] Please refer to Figure 4 In this embodiment, the placement chamber 6 includes a transparent chamber 61 with an open top, a support platform 62 placed inside the chamber, and a sample cup 63 placed on the support platform 62. The sample cup 63 is used to hold asphalt samples. The top opening design of the transparent chamber 61, combined with a high light transmittance material, provides the operator with an unobstructed 360° viewing angle. Furthermore, the support platform 62 and the transparent chamber 61 adopt an independent placement structure, allowing for quick replacement according to different testing needs.
[0044] In this embodiment, the support platform 62 is suspended inside the transparent chamber 61 by several legs 64. The upper surface of the support platform 62 is provided with a magnetic area 621 and a non-magnetic area 622. The sample cup 63 has a magnetic attraction structure and can be attracted to the magnetic area 621. Specifically, a groove is formed on the upper surface of the support platform 62, and a magnetic component is embedded in the groove. The surface of the magnetic component is flush with the upper surface of the support platform 62. The area of the magnetic area 621 is larger than the area of the non-magnetic area 622.
[0045] The support platform 62 is suspended within the transparent chamber 61 by legs 64, effectively isolating the direct transmission of external vibrations to the sample cup 63. Combined with the directional adsorption of the magnetic sample cup 63 by the magnetic zone 621, a dual stabilization mechanism of "physical vibration isolation and magnetic fixation" is formed. The clear division between the magnetic zone 621 and the non-magnetic zone 622 allows the operator to automatically adsorb and position the sample cup 63 simply by bringing it close to the magnetic zone 621, avoiding the problem of the sample cup 63 shifting during needle puncture. In other words, the magnetic zone 621 serves to fix the sample cup 63, and when removing the sample cup 63, it can be easily removed by moving it to the non-magnetic zone 622, making the operation simple and convenient.
[0046] The base 1 in this embodiment is also provided with a lighting mechanism 7, which includes a universal tube 71 and a lighting lamp 72 connected to the universal tube 71. The flexible nature of the universal tube 71 allows the lighting lamp 72 to be accurately positioned in any blind spot inside the transparent cabin 61, and the 360° flexible adjustment of the illumination angle eliminates the shadow interference caused by traditional fixed lighting.
[0047] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An asphalt penetration tester, characterized in that, It includes a base, a column mounted on the base, a lifting seat slidably fitted on the column, a test needle assembly and a needle tip positioning assembly mounted on the bottom of the lifting seat, and a placement compartment located on the base and below the test needle assembly. The needle tip positioning assembly includes a connecting plate disposed at the bottom of the lifting seat, a limiting member that is elastically slidably engaged on the connecting plate, and a positioning ring and an indicator needle connected to the limiting member; the positioning ring is located directly below the test needle assembly, and the indicator needle points to the connecting plate. The connecting plate is provided with a positioning mark. When the indicator needle points to the positioning mark, the tip of the test needle assembly is flush with the lower end face of the positioning ring.
2. The asphalt penetration tester according to claim 1, characterized in that, The connecting plate includes a first plate and a second plate that are perpendicular to each other. The first plate is parallel to the moving direction of the lifting seat. The limiting member is engaged with the second plate, and the positioning mark is located on the first plate.
3. The asphalt penetration tester according to claim 2, characterized in that, The limiting component includes a guide post movably inserted into the second plate, a first limiting block and a second limiting block located at both ends of the guide post, and an elastic element sleeved on the guide post; the elastic element abuts against the lower end face of the second plate and the second limiting block, the positioning ring is connected to one side of the second limiting block, and the indicator needle is located on the first limiting block.
4. The asphalt penetration tester according to claim 3, characterized in that, The lower end face of the positioning ring is lower than the lower end face of the second limiting block.
5. The asphalt penetration tester according to claim 1, characterized in that, The test probe assembly includes a needle holder mounted on the bottom of the lifting seat and a test probe body detachably mounted on the needle holder, the test probe body passing through the inner ring of the positioning ring.
6. The asphalt penetration tester according to claim 5, characterized in that, The positioning marker includes two marker blocks spaced apart. The two marker blocks are spaced apart along the moving direction of the lifting seat, and the distance between the two marker blocks is equal to the distance between the tip of the test needle body and the lower end face of the positioning ring.
7. The asphalt penetration tester according to claim 1, characterized in that, The placement chamber includes a transparent chamber with an opening at the top, a support platform placed inside the chamber, and a sample cup placed on the support platform. The sample cup is used to hold asphalt samples.
8. The asphalt penetration tester according to claim 7, characterized in that, The support platform is suspended in the transparent chamber by several legs. The upper surface of the support platform is provided with magnetic and non-magnetic areas. The sample cup has a magnetic structure and can be attracted to the magnetic area.
9. The asphalt penetration tester according to claim 1, characterized in that, The base is also provided with a lighting mechanism, which includes a universal tube and a light connected to the universal tube.