Asphalt penetrometer

Abstract

The utility model discloses an asphalt penetrometer, which is characterized in that a top sensor and a gravity sensor are synchronously arranged on a vertical driving part, a needle rod fixing bin is arranged on the gravity sensor, a clamping block and a clamping spring are arranged in the needle rod fixing bin, a controllable magnet is matched with the clamping block, and the clamping spring is arranged on the controllable magnet. And the controllable magnet attracts the clamping block to overcome the elastic force of the clamping spring so as to release the needle rod. An upper receding groove is formed in the bottom of the needle rod, a lower receding groove is formed in a nut locking sleeve arranged below the needle rod, the thin-waist elastic ring is fixed through the upper receding groove and the lower receding groove together, and the needle head is clamped and fixed to the elastic ring. During operation, after the high-precision gravity sensor senses that the tip of the test needle is in contact with the asphalt surface, the penetration depth starts to be measured, the needle head is automatically released after the measurement is completed, the needle head automatically falls off, and finally the penetration degree is measured and calculated.

Description

Technical Field

[0001] This utility model relates to the technical field of asphalt testing equipment, and in particular to an asphalt penetration tester. Background Technology

[0002] As is well known, an asphalt penetration tester is an instrument used to measure the penetration of asphalt, mainly used to determine the penetration of materials such as viscous petroleum asphalt, shale asphalt, and liquid petroleum asphalt.

[0003] In existing technology, the equipment used for testing asphalt penetration involves the following steps: Asphalt is placed in a water tank, the penetration is adjusted to zero, the needle rod is manually released, and the standard needle freely penetrates the sample. After a specified time of 5 seconds, the needle rod is tightened to prevent it from falling further. The digital display dial indicator is then pulled down to contact the top surface of the needle rod; the displayed value is the penetration value of the sample. The same sample is tested at least three times, with each penetration point having a distance of at least 10 mm from the edge of the sample dish. The average value of all test results is the result for that sample.

[0004] The technical problem encountered in the above operation steps is that the entire operation is done manually, and there is human error involved in the operation. This error seriously affects the test accuracy and ultimately leads to inaccurate test data.

[0005] Considering the above-mentioned drawbacks of the existing technology, the technical problem that urgently needs to be solved by those skilled in the art is: how to design an asphalt penetration tester through technological improvement, which can be automated during the testing process, especially in that the actions of contact with asphalt, needle insertion, and needle withdrawal during the testing process can all be automatically realized without being affected by human intervention. Summary of the Invention

[0006] To achieve the above objectives, this utility model develops an asphalt penetration meter, which automatically performs the following actions when in contact with asphalt, during penetration, and during measurement by setting a vertically movable rod, thereby reducing the involvement of human intervention.

[0007] The technical solution adopted in this utility model is as follows:

[0008] An asphalt needle penetration meter includes a machine base, on which a vertical drive unit and a display screen are mounted. A top sensor and a gravity sensor are synchronously mounted on the vertical drive unit. A needle rod fixing chamber is mounted on the gravity sensor. A clamping block and a clamping spring are mounted inside the needle rod fixing chamber. A controllable magnet is mounted in conjunction with the clamping block. The needle rod is released by the controllable magnet attracting the clamping block and overcoming the elastic force of the clamping spring.

[0009] The needle bar has an upper clearance groove at its bottom or on its extension sleeve, and a nut locking sleeve is located below the needle bar. The nut locking sleeve contains a lower clearance groove. The upper and lower clearance grooves together secure the narrow-waisted elastic ring, which clamps and fixes the needle tip. When the needle tip penetrates the asphalt, if the asphalt clamping force exceeds the clamping force of the narrow-waisted elastic ring, the needle tip will be trapped in the asphalt.

[0010] The vertical drive unit is equipped with a support rod, and a top sensor is mounted on the support rod, with the top sensor positioned directly above the needle bar.

[0011] The lower part of the needle bar fixing chamber is provided with a covering sleeve, which extends and covers the needle bar. This extension and covering is used to maintain the radial stability of the needle bar and prevent bending under force.

[0012] A positioning plate is provided at the lower part of the needle bar. When the needle bar is assembled into the needle bar fixing chamber from bottom to top, the positioning plate is used to achieve assembly positioning.

[0013] The clamping block is provided with a strip groove for the vertical passage of the needle bar. An extension is provided on the clamping block corresponding to the controllable magnet. A clamping spring is also provided between the needle bar fixing chamber end plate and the clamping block. The extension passes through the needle bar fixing chamber end plate.

[0014] The beneficial effects of this utility model are as follows: A top sensor and a gravity sensor are simultaneously installed on the vertical drive unit. A needle rod fixing chamber is installed on the gravity sensor. Inside the needle rod fixing chamber, a clamping block and a clamping spring are installed. A controllable magnet is installed in conjunction with the clamping block. The controllable magnet attracts the clamping block, overcoming the elastic force of the clamping spring to release the needle rod. An upper clearance groove is provided at the bottom of the needle rod, and a lower clearance groove is provided in the nut locking sleeve located below the needle rod. The upper and lower clearance grooves together fix the narrow-waisted elastic ring, and the needle tip is clamped and fixed on the elastic ring. When this utility model is running, after the high-precision gravity sensor senses the contact between the test needle tip and the asphalt surface, the needle penetration depth is measured. After the measurement is completed, the needle tip is automatically released, and finally, the needle penetration degree is calculated.

[0015] This utility model has a simple and novel structural design. It achieves automated operation through the above structure, avoiding the impact of human intervention on accuracy. It is an ideal asphalt penetration meter. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the front three-dimensional structure of this utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the rear side of this utility model;

[0018] Figure 3 This is a schematic diagram of the bottom three-dimensional structure of this utility model;

[0019] Figure 4 This is a side view structural diagram of the present invention;

[0020] Figure 5 This is a schematic diagram of a needle-disengagement mechanism;

[0021] Reference numerals: 1. Machine base; 11. Test platform; 12. Water tank; 2. Vertical drive unit; 21. Clearance groove; 22. Display screen; 3. Needle bar; 30. Covering sleeve; 31. Positioning plate; 32. Extension sleeve; 321. Upper clearance groove; 33. Nut locking sleeve; 331. Lower clearance groove; 34. Narrow-waisted elastic ring; 4. Top sensor; 41. Support rod; 5. Controllable magnet; 51. Magnet support frame; 6. Gravity sensor; 7. Needle bar fixing chamber; 71. Clamping block; 72. Strip groove; 73. Clamping spring; 74. Needle bar fixing chamber end plate; 75. Extension part; 8. Needle tip. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0023] As shown in the attached figure, an asphalt penetration tester includes a machine base 1, a test platform 11 is provided on the machine base 1, and a water tank 12 is provided on the upper part of the test platform 11 for placing and fixing the test liquid and asphalt test specimens.

[0024] The machine tool 1 is also equipped with a vertical drive unit 2 and a display screen 22, which are the same designs as those in the prior art. The vertical drive unit 2 is equipped with a vertical lead screw pair and a drive motor inside, and a vertical clearance groove 21 is provided on the outside of the housing of the vertical drive unit 2. The driving principle of the above structure is well known to those skilled in the art, and will not be described in detail here.

[0025] A support rod 41 and a magnet support frame 51 are synchronously arranged on the lead screw pair inside the vertical drive unit 2, with a fixed-length gap between the support rod 41 and the magnet support frame 51. A top sensor 4 is arranged downwards on the support rod 41, and the top sensor 4 is positioned directly above the needle bar 3. In this embodiment, the top sensor is a photoelectric sensor. A controllable magnet 5 is arranged on the magnet support frame 51.

[0026] A gravity sensor 6 is located below the controllable magnet 5, and the gravity sensor 6 moves synchronously with the controllable magnet 5. A needle rod fixing chamber 7 is provided on the gravity sensor 6, such as... Figure 4As shown, the needle bar fixing chamber 7 has a horizontal hole inside, in which a clamping block 71 and a clamping spring 73 are installed. The clamping spring 73 and the clamping block 71 are limited by the needle bar fixing chamber end plate 74. The needle bar fixing chamber 7 has a vertical through hole. The clamping block 71 has a strip groove 72 that is used in sync with the through hole for the vertical passage of the needle bar 3. The clamping block 71 has an extension 75 corresponding to the controllable magnet 5. The clamping spring 73 is installed between the needle bar fixing chamber end plate 74 and the clamping block 71. The extension 75 passes through the needle bar fixing chamber end plate 74.

[0027] The controllable magnet 5 faces the extension 75, and the controllable magnet 5 attracts the clamping block 71, overcoming the elastic force of the clamping spring 73, thus enabling the clamping block 71 to move; as Figure 4 In the process, when the controllable magnet 5 is not in the attracted state, under the elastic force of the clamping spring 73, the needle rod 3 is squeezed from the side by the side wall of the strip groove 72, thereby preventing the needle rod 3 from falling freely. When the controllable magnet 5 is energized, the clamping block 71 is driven to move to the left by the extension 75 of the controllable magnet 5, overcoming the elastic force of the clamping spring 73. At this time, the side wall of the strip groove 72 disengages from the needle rod 3, and the needle rod 3, together with the needle tip 8 at its bottom, falls into the asphalt in a free fall state.

[0028] like Figure 5 As shown, this utility model has an extension sleeve 32 at the bottom of the needle bar 3, with a tapered upper clearance groove 321 on the extension sleeve 32. A nut locking sleeve 33 is located below the needle bar 3, with a tapered lower clearance groove 331 inside the nut locking sleeve 33. The upper clearance groove 321 and the lower clearance groove 331 together fix the narrow-waisted elastic ring 34, which clamps and fixes the needle tip 8. The narrow-waisted elastic ring 34 connects and fixes the needle tip 8 to the needle bar 3 as a whole. During testing, when the needle tip 8 penetrates into the asphalt, if the asphalt clamping force is greater than the clamping force of the narrow-waisted elastic ring 34, the needle tip 8 is trapped in the asphalt.

[0029] Furthermore, a covering sleeve 30 is provided at the lower part of the needle bar fixing chamber 7, which extends and covers the needle bar 3. This extension and covering is used to maintain the radial stability of the needle bar 3 and prevent bending when it is driven into the asphalt under stress.

[0030] Furthermore, a positioning plate 31 is provided at the lower part of the needle bar 3. When the needle bar 3 is assembled into the needle bar fixing chamber 7 from bottom to top, the positioning plate 31 is used to achieve assembly positioning.

[0031] When this utility model is in operation, the steps are as follows:

[0032] 1. Heat the pre-dehydrated asphalt sample to melt it, ensuring the temperature does not exceed the estimated softening point of the sample by 90°C and the time does not exceed 2 minutes. Stir thoroughly, sieve, and pour into a sample dish. The depth should exceed the expected penetration value by at least 12 mm. Place it in air at 20-35°C to cool for 1 hour.

[0033] 2. Place the sample dish into water tank 12 filled with clean water and keep it warm for 1.5 hours;

[0034] 3. After adding the specified amount of clean water to the water tank 12, place the temperature probe in the water tank and control the water temperature within the range of 25℃;

[0035] 4. The vertical drive unit 2 drives the top sensor 4, needle bar 3, and controllable magnet 5 to move down synchronously. At this time, the controllable magnet 5 is in a non-attractive state. Under the elastic force of the clamping spring 73, it achieves lateral compression of the needle bar 3 through the side wall of the strip groove 72, thereby preventing the needle bar 3 from falling freely. When the needle tip 8 contacts the asphalt, the gravity sensor 6 senses it and stops moving. At this time, the top sensor 4 will detect the relative distance with the top of the needle bar 3.

[0036] 5. When the controllable magnet 5 is energized, the extension 75 is attracted by the controllable magnet 5, which drives the clamping block 71 to move to the left against the elastic force of the clamping spring 73. At this time, the side wall of the strip groove 72 is disengaged from the needle rod 3. The needle rod 3, together with the needle tip 8 at its bottom and the counterweight, falls into the asphalt in a free fall state. When the specified time of 5 seconds is reached, the time is stopped and the needle rod 3 stops falling. At this time, the penetration value of the sample is displayed.

[0037] The vertical drive unit 2 drives the top sensor 4, needle bar 3, and controllable magnet 5 to move upward synchronously, keeping the needle 8 in the asphalt;

[0038] 6. The same sample shall be tested at least three times. The distance between the needle insertion points and the distance between the edges of the sample container shall not be less than 10 mm each time. The average value of the test results shall be the result of the sample.

[0039] This utility model has a simple and novel structural design. The testing processes in steps 4, 5, and 6 of the above side view are automated, effectively avoiding the impact on accuracy caused by human intervention.

Claims

1. An asphalt penetrometer characterized by: Including machine platform, be provided with vertical drive part and display screen on machine platform, vertical drive part is provided with top sensor and gravity sensor simultaneously on, gravity sensor is provided with needle rod fixed bin on, needle rod fixed bin is provided with clamping block and clamping spring inside, controllable magnet is provided with clamping block matchedly, and the needle rod is released by controllable magnet attraction clamping block and overcomes the elastic force of clamping spring.

2. The asphalt penetrometer of claim 1, wherein: The bottom of the needle rod is provided with an upper avoiding slot, or an upper avoiding slot is provided on the extension sleeve, a nut locking sleeve is provided below the needle rod, a lower avoiding slot is provided in the nut locking sleeve, the upper avoiding slot and the lower avoiding slot together fix the slim elastic ring, and the slim elastic ring clamps and fixes the needle.

3. The asphalt penetrometer of claim 1, wherein: The vertical drive part is provided with a support rod, and the support rod is provided with a top sensor, which is arranged directly above the needle rod.

4. The asphalt penetrometer of claim 1, wherein: The lower part of the needle rod fixed bin is provided with a cladding sleeve, which realizes the extension cladding of the needle rod.

5. The asphalt penetrometer of claim 1, wherein: The lower part of the needle rod is provided with a positioning plate.

6. The asphalt penetrometer of claim 1, wherein: The clamping block is provided with a strip-shaped slot for vertical penetration of the needle rod, the clamping block is provided with an extension corresponding to the controllable magnet, a clamping spring is further provided between the end plate of the needle rod fixed bin and the clamping block, and the extension penetrates the end plate of the needle rod fixed bin.

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