Calibration device for asphalt penetrometer and calibration method thereof

Abstract

The present application relates to the technical field of road engineering, and aims to provide a calibration device for asphalt penetrometer, which comprises a processor, a display, a mounting bracket mounted on the head of the penetrometer, and a calibration mechanism arranged on the mounting bracket; the calibration mechanism is provided with a swing rod, a contact rod is arranged on the swing rod and rotationally matched with the swing rod, and the rod shaft of the contact rod is connected with the input end of a rotary encoder; the swing rod can swing under its own gravity and drive the contact rod to abut against the side wall of the needle connecting rod of the penetrometer to form contact with the needle connecting rod; the rotary encoder is electrically connected with the processor, and the processor is electrically connected with the display. The present application can assist the operator to quickly and efficiently calibrate the penetrometer, is convenient to use, can be adapted to various types of penetrometers, and has good universality.

Description

Technical Field

[0001] This invention relates to the field of road engineering technology, and specifically to a calibration device and calibration method for an asphalt penetration meter. Background Technology

[0002] An asphalt penetration tester is a specialized instrument used to determine the penetration depth of asphalt, widely applied in the quality testing of asphalt materials. Its working principle is to measure the consistency of asphalt by the depth (in units of 0.1 mm) to which a standard needle vertically penetrates the asphalt sample under specified temperature (typically 25℃), time (5 seconds), and load (100g) conditions—the smaller the penetration value, the thicker and harder the asphalt. The instrument mainly consists of a base, lifting mechanism, needle rod, weights, and temperature control device. Some high-precision models are equipped with automatic timing and digital display functions to reduce human error. It is an important piece of equipment for evaluating the grade and performance of asphalt in highway engineering and the building materials industry; the test results directly affect the mix design and construction quality of asphalt mixtures. After a period of use, the asphalt penetration tester is affected by factors such as mechanical transmission errors and component wear, requiring periodic calibration to improve accuracy.

[0003] Currently, the calibration of needle penetration meters mainly relies on measuring the movement of the needle linkage using gauge blocks and measuring rods of standard lengths. This method is largely manual, which is cumbersome and prone to significant errors due to human error, making it increasingly unsuitable for practical applications. Furthermore, there are few reports on dedicated calibration devices for asphalt needle penetration meters. At the same time, there are many types and models of needle penetration meters on the market, making the development of a highly versatile calibration device essential. Summary of the Invention

[0004] The purpose of this invention is to provide a calibration device and calibration method for an asphalt penetration meter that is fast, easy to use, and widely applicable.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is: a calibration device for an asphalt penetration meter, comprising a processor, a display, a mounting bracket mounted on the head of the penetration meter, and a calibration mechanism disposed on the mounting bracket;

[0006] The calibration mechanism has a swing arm with a contact rod that rotates with it. The shaft of the contact rod is connected to the input end of the rotary encoder. The swing arm can swing under its own weight and cause the contact rod to rest against the side wall of the needle rod of the needle penetration instrument to form contact with the needle rod. The rotary encoder is electrically connected to the processor, and the processor is electrically connected to the display.

[0007] Preferably, the calibration mechanism further includes a vertical rod, the upper end of which is mounted on a mounting frame, and the lower end of which is mounted on a carrier plate; the middle section of the swing rod near one end forms a rotatable engagement with the carrier plate, and the other end of the swing rod is provided with a contact rod and a rotary encoder.

[0008] Preferably, the rocker arm, contact rod, and rotary encoder are provided in two sets.

[0009] Preferably, a connecting rod is provided between the ends of the two swing rods away from the contact rod, and both ends of the connecting rod are in rotational engagement with the two swing rods.

[0010] Preferably, the processor integrates a timing module, and a drive component electrically connected to the processor is provided on the carrier plate between the two swing arms. The drive component can drive the swing arms to swing by pushing the connecting rod, so that the contact bar on the swing arm disengages from the side wall of the needle connecting rod.

[0011] Preferably, the driving component is an electromagnetic push rod, the output end of which faces the connecting rod and is provided with a push head, and the side of the connecting rod is provided with a bent edge at the position opposite to the push head.

[0012] Preferably, the mounting bracket includes a U-shaped fixing plate for being snapped onto the machine head, and a fixing bolt that is threadedly engaged with the fixing plate is provided on one side of the fixing plate, and a clamping head is provided at the inner end of the fixing bolt;

[0013] The front side of the fixed plate is provided with a T-shaped support plate extending forward, and the center of the support plate is provided with a strip-shaped hole extending in the front-back direction; an adjusting sleeve is provided in the strip-shaped hole to form a sliding fit with the strip-shaped hole; the support plate corresponding to the side wall of the strip-shaped hole is provided with a strip-shaped pin hole extending in the length direction of the strip-shaped hole, and a sliding pin is provided on the side wall of the adjusting sleeve to pass through the pin hole. The adjusting sleeve is locked to the support plate by a locking nut sleeved on the sliding pin and forming a threaded fit with the sliding pin.

[0014] Preferably, the central hole of the adjusting sleeve is square, and the upper end of the vertical rod is also square and matches the central hole of the adjusting sleeve; a locking bolt is provided on the side wall of the adjusting sleeve, the locking bolt and the side wall of the adjusting sleeve form a threaded engagement, and the vertical rod is locked in the adjusting sleeve by the locking bolt.

[0015] Preferably, triangular reinforcing plates are provided between the two sides of the T-shaped head of the tray and the fixing plate.

[0016] Preferably, the calibration method includes the following steps:

[0017] A. Install the calibration device on the head of the needle penetration tester;

[0018] B. Adjust the front-to-back and height positions of the calibration mechanism so that the contact bar corresponds to the position of the needle connecting rod; after lowering the swing arm, the contact bar automatically rests against the side wall of the needle connecting rod and makes contact with the needle connecting rod.

[0019] C. The needle penetration gauge lowers the needle linkage, and the contact bar rotates following the movement of the needle linkage, converting the vertical movement of the needle linkage into the rotational movement of the contact bar, and the rotation signal is collected by the rotary encoder; the timing module in the processor starts timing when the rotary encoder is triggered, and after 5 seconds the drive unit drives the swing arm to swing, causing the contact bar at the end of the swing arm to disengage from the needle linkage.

[0020] The processor calculates the movement distance of the needle link in 5 seconds using the data from the rotary encoder, and displays it on the display as actual measurement data. At the same time, the needle penetration meter itself simultaneously times and counts the movement distance of the needle link within 5 seconds, and displays it as instrument data on the needle penetration meter.

[0021] D. Determine whether the measured data collected by the two rotary encoders are consistent. If yes, calibrate the penetration meter based on the difference between the measured data and the instrument data. If no, repeat steps BC, adjust the calibration device, and re-measure until the measured data obtained by the two rotary encoders are consistent.

[0022] The beneficial effects of this invention are mainly reflected in: it can assist operators in quickly and efficiently calibrating the needle penetration meter; it is easy to use; it can adapt to various types of needle penetration meters; and it has good versatility. Specifically, during use, the calibration mechanism is fixed to the head of the needle penetration meter via a mounting bracket. The contact rod contacts the needle connecting rod of the needle penetration meter. When the needle connecting rod moves vertically, it drives the contact rod to rotate. A rotary encoder collects the rotation data signal of the contact rod and sends it to the processor. The processor processes the rotation data signal and sends it to the display for comparison with the displayed data of the needle penetration meter. This invention can quickly and accurately reflect the needle penetration value of the needle penetration meter, assisting operators in quickly adjusting the needle penetration meter. Furthermore, because it is installed entirely on the head, it does not occupy the detection space below the needle connecting rod on the needle penetration meter. When the needle penetration meter itself cannot be quickly repaired or calibrated, it can be temporarily used as an external module to collect experimental data without affecting the normal conduct of the asphalt needle penetration test. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an existing needle penetration meter;

[0024] Figure 2 This is a schematic diagram of the structure of the present invention after it is installed on a needle penetration meter;

[0025] Figure 3 for Figure 2Enlarged view of section A in the middle;

[0026] Figure 4 for Figure 3 The diagram shows a usage state of the structure shown.

[0027] Figure 5 for Figure 3 A schematic diagram of another usage state of the structure shown;

[0028] Figure 6 This is a top view of the mounting bracket;

[0029] Figure 7 This is a top view of the pendulum. Detailed Implementation

[0030] like Figure 1 The diagram shows a schematic of a needle penetration meter for asphalt testing, comprising a base, a head 0, and a needle connecting rod 6 mounted on the head 0 for mounting a standard needle. This invention is a calibration device for calibrating the penetration value of a needle penetration meter, combined with... Figure 2-7 As shown, the present invention includes a processor (for receiving and processing data, and integrating certain control functions), a display (for displaying and processing the measured data obtained by the calibration device), a mounting bracket 1 (serving as the mounting base of the device) mounted on the head 0 of the needle penetration meter, and a calibration mechanism 2 (serving as the core part of the present invention for calibration work) set on the mounting bracket 1.

[0031] This invention abandons the traditional method of calibration using standard gauge blocks, such as... Figure 3 and 7 As shown, the calibration mechanism 2 of this invention has a pendulum 3, on which a contact rod 4 is provided to form a rotational engagement with the pendulum 3. The shaft of the contact rod 4 is connected to the input end of a rotary encoder 5. The rotary encoder 5 can collect the rotational data of the contact rod 4. The rotary encoder 5 is a micron-level high-precision rotary encoder with a testing accuracy of ±0.1 microns, exhibiting extremely high measurement accuracy. When the contact rod 4 is rotatably connected to the pendulum 3, it preferably has a certain adjustable damping, which can prevent the contact rod 4 from rotating erroneously and can simulate the state of asphalt with different consistencies.

[0032] The pendulum 3 described in this invention can swing under its own weight, causing the contact rod 4 to rest against the side wall of the needle rod 6 of the needle penetration meter, forming contact with the needle rod 6. The rotary encoder 5 is electrically connected to the processor, and the processor is electrically connected to the display.

[0033] In use, the calibration mechanism 2 is fixed to the head 0 of the penetration meter via the mounting bracket 1. The contact rod 4 contacts the needle connecting rod 6 of the penetration meter. When the needle connecting rod 6 moves vertically, it drives the contact rod 4 to rotate. The rotation data signal of the contact rod 4 is collected by the rotary encoder 5 and sent to the processor. After processing the rotation data signal, the processor sends it to the display for comparison with the data displayed by the penetration meter. This invention can quickly and accurately reflect the penetration value of the penetration meter, assisting operators in quickly adjusting the penetration meter. Since it is installed on the head 0, it does not occupy the detection space below the needle connecting rod 6 on the penetration meter. When the penetration meter itself cannot be quickly repaired or calibrated, it can be temporarily used as an external module to collect experimental data without affecting the normal conduct of the asphalt penetration test.

[0034] To facilitate the installation of the pendulum rod 3, the calibration mechanism 2 of the present invention further includes a vertical rod 7. The upper end of the vertical rod 7 is mounted on the mounting frame 1, and the lower end of the vertical rod 7 is mounted on a carrier plate 8. The middle section of the pendulum rod 3 near one end forms a rotatable engagement with the carrier plate 8, and the other end of the pendulum rod 3 is provided with a contact rod 4 and a rotary encoder 5.

[0035] To enable the calibration mechanism 2 to be adjusted forward and backward and vertically within space, so that the contact rod 4 can be stably aligned with the side wall foundation of the needle insertion rod 6 of the needle penetration meter, the vertical rod 7 of this invention has forward and backward adjustment and lifting adjustment functions on the mounting frame 1. Combined with... Figure 3 and 6 As shown, in terms of fixing, the mounting bracket 1 of the present invention may include a U-shaped fixing plate 13 for clamping onto the head 0 of the instrument. One side of the fixing plate 13 is provided with a fixing bolt 14 that forms a threaded engagement with the fixing plate 13, and the inner end of the fixing bolt 14 is provided with a clamping head 15. In use, the fixing plate 13 is clamped onto the head 0 of the needle penetration instrument and locked using the fixing bolt 14. Before locking, a level can be used with a level located on the fixing plate 13 to ensure the levelness of the fixing plate 13. Of course, other similar fixing methods are also feasible.

[0036] Regarding front and rear adjustments, such as Figure 6As shown, the present invention provides a forward-extending T-shaped support plate 16 on the front side of the fixed plate 13, and a strip-shaped hole 17 extending in the front-back direction is provided at the center of the support plate 16. Triangular reinforcing plates 22 can be provided between the two sides of the T-shaped head of the support plate 16 and the fixed plate 13 to improve the stability and structural strength of the support plate 16. An adjusting sleeve 18 is provided in the strip-shaped hole 17 to form a sliding fit with the strip-shaped hole 17. The middle section of the adjusting sleeve 18 can be a forged section, which can be precisely locked in the strip-shaped hole 17 and slide in the front-back direction with the strip-shaped hole 17. Regarding the locking method of the front and rear positions, there are many specific structures. For example, the support plate 16 corresponding to the side wall of the strip hole 17 is provided with a strip-shaped pin hole extending along the length direction of the strip hole 17. The side wall of the adjusting sleeve 18 is provided with a sliding pin 19 that passes through the pin hole. The adjusting sleeve 18 is locked to the support plate 16 by a locking nut 20 that is sleeved on the sliding pin 19 and forms a threaded engagement with the sliding pin 19.

[0037] Regarding the lifting adjustment, the central hole of the adjusting sleeve 18 is square, and the upper end of the vertical rod 7 is also square, cooperating with the central hole of the adjusting sleeve 18. A locking bolt 21 is provided on the side wall of the adjusting sleeve 18, and the locking bolt 21 forms a threaded engagement with the side wall of the adjusting sleeve 18, thereby locking the vertical rod 7 inside the adjusting sleeve 18.

[0038] This invention measures the vertical movement of the needle connecting rod 6 by using a rotary encoder 5 mounted on a pendulum rod 3 and a contact rod 4 in conjunction with the vertical movement of the needle connecting rod 6. To ensure measurement accuracy and prevent calibration errors caused by the calibration device itself, the invention employs two sets of components: the pendulum rod 3, the contact rod 4, and the rotary encoder 5. Theoretically, the verticality measured by the two sets of rotary encoders 5 should be consistent during measurement. By cross-checking the measurement data from the two sets of contact rods 4 and rotary encoders 5, the accuracy of the detection is improved, further reducing the risk of detection errors caused by improper human operation (such as errors caused by insufficient levelness of the mounting bracket 1 or incomplete contact between the contact rod 4 and the needle connecting rod 6).

[0039] like Figure 3 As shown, after the invention is installed on the machine head 0, since the installation position of the swing arm 3 is not in the center, the swing arm 3 is affected by its own weight and the weight of the components installed on it (contact rod 4, rotary encoder 5), and it can swing naturally until the contact rod 4 contacts the side wall of the needle connecting rod 6. In order to facilitate the synchronous operation of the two swing arms 3, a connecting rod 9 is provided between the ends of the two swing arms 3 away from the contact rod 4. Both ends of the connecting rod 9 are in rotational engagement with the two swing arms 3.

[0040] To enable the invention to simultaneously possess time calibration functionality, a timing module is integrated within the processor. Simultaneously with the rotary encoder 5 generating a feedback signal, the timing module can be synchronously triggered, ensuring synchronization between timing and displacement. After the test time (5 seconds) ends, to achieve rapid disengagement of the contact rod 4 from the needle connecting rod 6, a drive component 10 electrically connected to the processor is provided on the carrier plate 8 between the two swing rods 3. This drive component 10 can push the connecting rod 9 to drive the swing rod 3 to oscillate, causing the contact rod 4 on the swing rod 3 to disengage from the side wall of the needle connecting rod 6. The function of the drive component 10 is to cause the swing rod 3 to oscillate by pushing the connecting rod 9, combined with… Figure 3 , 4 As shown in Figure 5, the driving component 10 can be an electromagnetic push rod, which is controlled by a processor. The output end of the electromagnetic push rod faces the connecting rod 9 and is provided with a push head 11. A curved edge 12 is provided on the side of the connecting rod 9 opposite to the push head 11. When the electromagnetic push rod extends, it can push the curved edge 12 to the left, thereby causing the swing arm 3 to swing. However, during this process, there is a certain amount of sliding between the curved edge 12 and the push head 11. In order to reduce the sliding friction between the push head 11 and the curved edge 12, a coating can be sprayed on both surfaces to reduce the friction, or the push head 11 can be changed to a wheel structure, thereby changing the sliding fit into a rolling fit.

[0041] In addition, the present invention also discloses a calibration method using the calibration device, which includes the following steps:

[0042] A. Install the calibration device on the head 0 of the needle penetration meter.

[0043] B. Adjust the front-to-back and height positions of the calibration mechanism 2 so that the contact rod 4 corresponds to the position of the needle connecting rod 6. After lowering the swing arm 3, the contact rod 4 automatically rests against the side wall of the needle connecting rod 6, forming contact with the needle connecting rod 6.

[0044] C. The needle insertion gauge lowers the needle linkage 6, and the contact rod 4 rotates following the movement of the needle linkage 6, converting the vertical motion of the needle linkage 6 into the rotational motion of the contact rod 4. The rotational signal is collected by the rotary encoder 5. The timing module in the processor starts timing when the rotary encoder 5 is triggered. After 5 seconds, the drive component 10 drives the swing arm 3 to swing, causing the contact rod 4 at the end of the swing arm 3 to disengage from the needle linkage 6.

[0045] The processor calculates the movement distance of the needle link 65 seconds using the rotation data from the rotary encoder 5, and displays this as measured data on the monitor. Simultaneously, the needle penetration meter itself simultaneously times and tracks the movement distance of the needle link 6 within 5 seconds, displaying this data as instrument data on the needle penetration meter.

[0046] D. Determine whether the measured data collected by the two rotary encoders 5 are consistent. If yes, calibrate the penetration meter based on the difference between the measured data and the instrument data. If no, repeat steps BC, adjust the calibration device, and re-measure until the measured data obtained by the two rotary encoders 5 are consistent.

Claims

1. A calibration device for an asphalt penetration meter, characterized in that: It includes a processor, a display, a mounting bracket (1) mounted on the head (0) of the needle penetration instrument, and a calibration mechanism (2) set on the mounting bracket (1). The calibration mechanism (2) has a swing arm (3), on which a contact rod (4) is provided to form a rotational engagement with the swing arm (3). The shaft of the contact rod (4) is connected to the input end of the rotary encoder (5). The swing arm (3) can swing under its own weight and drive the contact rod (4) to rest against the side wall of the needle rod (6) of the needle penetration instrument to form contact with the needle rod (6). The rotary encoder (5) is electrically connected to the processor, and the processor is electrically connected to the display. The calibration mechanism (2) also includes a vertical rod (7), the upper end of which is mounted on the mounting frame (1), and the lower end of which is mounted on a carrier plate (8); the middle section of the swing rod (3) near one end forms a rotational engagement with the carrier plate (8), and the other end of the swing rod (3) is provided with a contact rod (4) and a rotary encoder (5). The swing arm (3), contact rod (4) and rotary encoder (5) are provided in two sets; A connecting rod (9) is provided between the ends of the two swing rods (3) away from the contact rod (4), and both ends of the connecting rod (9) are in rotational engagement with the two swing rods (3).

2. The calibration device for the asphalt penetration meter according to claim 1, characterized in that: The processor integrates a timing module. A drive unit (10) electrically connected to the processor is provided on the carrier plate (8) between the two swing rods (3). The drive unit (10) can drive the swing rod (3) to swing by pushing the connecting rod (9), so that the contact rod (4) on the swing rod (3) is disengaged from the side wall of the needle connecting rod (6).

3. The calibration device for the asphalt penetration meter according to claim 2, characterized in that: The driving component (10) is an electromagnetic push rod. The output end of the electromagnetic push rod faces the connecting rod (9) and is provided with a push head (11). A bent edge (12) is provided on the side of the connecting rod (9) opposite to the push head (11).

4. The calibration device for the asphalt penetration meter according to claim 3, characterized in that: The mounting bracket (1) includes a U-shaped fixing plate (13) for being clamped on the machine head (0). A fixing bolt (14) is provided on one side of the fixing plate (13) to form a threaded engagement with the fixing plate (13). A clamping head (15) is provided at the inner end of the fixing bolt (14). The front side of the fixed plate (13) is provided with a T-shaped support plate (16) extending forward. The center of the support plate (16) is provided with a strip hole (17) extending in the front-back direction. An adjusting sleeve (18) is provided in the strip hole (17) and forms a sliding fit with the strip hole (17). The support plate (16) corresponding to the side wall of the strip hole (17) is provided with a strip-shaped pin hole extending in the length direction of the strip hole (17). A sliding pin (19) is provided on the side wall of the adjusting sleeve (18) and passes through the pin hole. The adjusting sleeve (18) is locked on the support plate (16) by a locking nut (20) sleeved on the sliding pin (19) and forming a threaded fit with the sliding pin (19).

5. The calibration device for the asphalt penetration meter according to claim 4, characterized in that: The center hole of the adjusting sleeve (18) is square, and the upper end of the vertical rod (7) is also square and matches the center hole of the adjusting sleeve (18); a locking bolt (21) is provided on the side wall of the adjusting sleeve (18), the locking bolt (21) and the side wall of the adjusting sleeve (18) form a threaded fit, and the vertical rod (7) is locked in the adjusting sleeve (18) by the locking bolt (21).

6. The calibration device for the asphalt penetration meter according to claim 5, characterized in that: Triangular reinforcing plates (22) are provided between the two sides of the T-shaped head of the tray (16) and the fixing plate (13).

7. A calibration method using the calibration device of the asphalt penetration meter according to any one of claims 1-6, characterized in that, Includes the following steps: A. Install the calibration device on the head (0) of the needle penetration meter; B. Adjust the front and rear positions and height of the calibration mechanism (2) so that the contact rod (4) corresponds to the position of the needle connecting rod (6); after lowering the swing arm (3), the contact rod (4) automatically rests against the side wall of the needle connecting rod (6) and forms contact with the needle connecting rod (6); C. The needle insertion gauge lowers the needle linkage (6), and the contact bar (4) rotates following the movement of the needle linkage (6), converting the vertical movement of the needle linkage (6) into the rotational movement of the contact bar (4), and the rotation signal is collected by the rotary encoder (5); the timing module in the processor starts timing at the same time that the rotary encoder (5) is triggered, and after 5 seconds, the drive unit (10) drives the swing arm (3) to swing, so that the contact bar (4) at the end of the swing arm (3) is disengaged from the needle linkage (6); The processor calculates the movement distance of the needle link (6) in 5 seconds using the data from the rotary encoder (5), and displays it on the display as actual measurement data. At the same time, the needle penetration meter itself synchronously times and counts the movement distance of the needle link (6) in 5 seconds, and displays it on the needle penetration meter as instrument data. D. Determine whether the measured data collected by the two rotary encoders (5) are consistent; if yes, then calibrate the needle penetration instrument according to the difference between the measured data and the instrument data; if no, repeat steps BC, adjust the calibration device and re-measure until the measured data obtained by the two rotary encoders (5) are consistent.

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