Asphalt penetration meter calibration device and calibration method thereof

Abstract

The invention relates to the technical field of road engineering. The invention aims to provide a calibration device of an asphalt penetrometer. The calibration device comprises a processor, a display, a mounting rack mounted on a machine head of the penetrometer, and a calibration mechanism arranged on the mounting rack, the calibration mechanism is provided with a swing rod, the swing rod is provided with a contact rod which is in running fit with the swing rod, and a rod shaft of the contact rod is connected with the input end of a rotary encoder; the swing rod can swing under the gravity of the swing rod and drives the contact rod to abut against the side wall of a needle connecting rod of the penetrometer to make 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 device can assist an operator to quickly and efficiently calibrate the penetrometer, is convenient to use, can adapt to various types of penetrometers, and is good in universality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of road engineering, in particular to a calibration device of an asphalt penetrometer and a calibration method thereof. BACKGROUND

[0002] The asphalt penetrometer is a special instrument for measuring the penetration of asphalt, and is widely used in the quality detection of asphalt materials. Its working principle is to measure the consistency of asphalt by vertically penetrating the standard needle into the depth of the asphalt sample (in 0.1mm units) under the conditions of specified temperature (usually 25℃), time (5 seconds) and load (100g). The smaller the penetration value, the harder the asphalt. The instrument mainly consists of a base, a lifting mechanism, a needle rod, a weight, a temperature control device, etc. Some high-precision models are equipped with automatic timing and digital display functions to reduce human operation errors. It is an important device for evaluating the grade and performance of asphalt in highway engineering and building material industry, and the detection result directly affects the design and construction quality of asphalt mixture. After a period of use, the asphalt penetrometer is affected by mechanical transmission errors, component wear and other factors, and needs to be calibrated by a calibration device every certain period of time to improve the detection accuracy.

[0003] Currently, when calibrating the penetrometer, the movement of the needle connecting rod is mainly measured by using standard length blocks and rods, which basically relies on manual operation. On the one hand, the operation is tedious, and on the other hand, the error caused by human operation is large, which is increasingly unsuitable for actual use. At present, there are few reports on special calibration devices for asphalt penetrometers. At the same time, there are many types and models of penetrometers on the market, and it is necessary to develop a calibration device with high universality. SUMMARY

[0004] The purpose of the present application is to provide a calibration device for an asphalt penetrometer which can realize fast calibration, is easy to use and has good universality, and a calibration method thereof.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is: a calibration device for an asphalt penetrometer, comprising a processor, a display, a mounting bracket mounted on the head of the penetrometer, and a calibration mechanism arranged on the mounting bracket.

[0006] The calibration mechanism has 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.

[0007] Preferably, the calibration mechanism further comprises a vertical rod, the upper end of the vertical rod is arranged on the mounting frame, and the lower end of the vertical rod is arranged on the carrier plate; the middle section of the swing rod close to one end is in rotational cooperation with the carrier plate, and the other end of the swing rod is arranged with a contact rod and a rotary encoder.

[0008] Preferably, the swing rod, the contact rod and the rotary encoder are arranged in two groups.

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

[0010] Preferably, the processor is internally integrated with a timing module, and a driving element electrically connected with the processor is arranged on the carrier plate between the two swing rods, the driving element can drive the swing rod to swing by pushing the connecting rod, so that the contact rod on the swing rod is separated from the side wall of the needle connecting rod.

[0011] Preferably, the driving element is an electromagnetic push rod, the output end of the electromagnetic push rod is arranged with a push head facing the connecting rod, and the side edge of the connecting rod opposite to the push head is arranged with a bent edge.

[0012] Preferably, the mounting frame comprises a U-shaped fixing plate for clamping on the head of the needle penetration tester, one side of the fixing plate is arranged with a fixing bolt in threaded cooperation with the fixing plate, and the inner end of the fixing bolt is arranged with a clamping head.

[0013] The front side of the fixing plate is arranged with a T-shaped supporting plate extending forward, the center of the supporting plate is arranged with a strip-shaped hole extending in the front-rear direction; the strip-shaped hole is arranged with an adjusting sleeve in sliding cooperation with the strip-shaped hole; the strip-shaped hole side wall is arranged with a strip-shaped pin hole extending along the length direction of the strip-shaped hole, the side wall of the adjusting sleeve is arranged with a sliding pin penetrating in the pin hole, and the adjusting sleeve is locked on the supporting plate through a locking nut on the sliding pin in threaded cooperation with the sliding pin.

[0014] Preferably, the center hole of the adjusting sleeve is square-shaped, the upper end of the vertical rod is also square-shaped and cooperates with the center hole of the adjusting sleeve; the side wall of the adjusting sleeve is arranged with a locking bolt, the locking bolt is in threaded cooperation with the side wall of the adjusting sleeve, and the vertical rod is locked in the adjusting sleeve through the locking bolt.

[0015] Preferably, the two sides of the T-shaped head of the supporting plate are arranged with triangular reinforcing plates between the fixing plate.

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

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

[0018] B, adjust the front and rear position and height position of the calibration mechanism, so that the contact rod corresponds to the position of the needle connecting rod; after the swing rod is lowered, the contact rod is automatically rested on the side wall of the needle connecting rod and forms contact with the needle connecting rod;

[0019] C, the needle penetration instrument lowers the needle connecting rod, the contact rod follows the movement of the needle connecting rod to form rotation, converts the vertical movement of the needle connecting rod into rotary movement of the contact rod, and collects the rotary signal through the rotary encoder; the timing module in the processor starts timing at the same time when the rotary encoder is triggered, and after 5S, the swing rod is swung by the driving part, so that the contact rod at the end of the swing rod is separated from the needle connecting rod;

[0020] The processor calculates the movement distance of the needle connecting rod in 5S through the rotary data of the rotary encoder as measured data, and displays it on the display; at the same time, the needle penetration instrument itself synchronously performs timing and statistics of the movement distance of the needle connecting rod in 5S as instrument data and displays it on the needle penetration instrument;

[0021] D, judge whether the measured data collected by the two rotary encoders is consistent; if yes, calibrate the needle penetration instrument according to the difference between the measured data and the instrument data; if no, repeat steps B-C, adjust the calibration device and then measure again until the measured data measured by the two rotary encoders is consistent.

[0022] The beneficial effects of the present application are mainly reflected in: it can assist the operator to quickly and efficiently calibrate the needle penetration instrument, is convenient to use, can adapt to various types of needle penetration instruments, and has good universality. Specifically, in the use process, the calibration mechanism is fixed on the machine head of the needle penetration instrument through the mounting frame, the contact rod contacts the needle connecting rod of the needle penetration instrument, the needle connecting rod rotates the contact rod when vertically moving, the rotary data signal of the contact rod is collected by the rotary encoder and sent to the processor, the processor processes the rotary data signal and sends it to the display for presentation, so as to compare with the display data of the needle penetration instrument. The present application can quickly and accurately reflect the penetration value of the needle penetration instrument, assist the operator to quickly debug the needle penetration instrument, and since the whole is installed on the machine head, it does not occupy the detection space below the needle connecting rod of the needle penetration instrument, and in the case that the needle penetration instrument itself cannot be quickly repaired or calibrated, it can temporarily serve as an external module to statistically analyze experimental data, without affecting the normal performance of the asphalt penetration experiment. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the existing needle penetration instrument;

[0024] Figure 2 It is a structural schematic diagram of the present application after being installed on the needle penetration instrument;

[0025] Figure 3 It is Figure 2Enlarged view of middle A part;

[0026] Figure 4 For Figure 3 An application state diagram of the structure shown in middle A part;

[0027] Figure 5 For Figure 3 Another application state diagram of the structure shown in middle A part;

[0028] Figure 6 For the top view of the fixing frame;

[0029] Figure 7 For the top view of the swing lever. DETAILED DESCRIPTION

[0030] As Figure 1 shown, it is a structure diagram of a penetration meter for asphalt detection, which comprises a base, a machine head 0, a needle connecting rod 6 provided on the machine head 0 and used for mounting a standard needle. The present application is a calibration device for calibrating the penetration value of the penetration meter, which, as shown in the combination Figures 2-7 , comprises a processor (used for receiving and calculating data, integrated with certain control functions), a display (used for displaying and processing the measured data measured by the calibration device), a mounting frame 1 mounted on the machine head 0 of the penetration meter (as the mounting basis of the device), and a calibration mechanism 2 provided on the mounting frame 1 (as the core part of the present application for calibration work).

[0031] The present application discards the traditional calibration method using standard gauge blocks, as shown in Figure 3 and 7 , the calibration mechanism 2 of the present application has a swing lever 3, the swing lever 3 is provided with a contact rod 4 in rotational cooperation with the swing lever 3, and the rod shaft of the contact rod 4 is connected with the input end of a rotary encoder 5. The rotary encoder 5 can collect the rotation data of the contact rod 4, the rotary encoder 5 adopts a micron-level high-precision rotary encoder, the test precision reaches ±0.1 microns, and has extremely high measurement precision. The contact rod 4 is best provided with certain adjustable damping when being rotationally connected with the swing lever 3, which can prevent the contact rod 4 from being misrotated on one hand, and can simulate the state of asphalt with different viscosities on the other hand.

[0032] The swing lever 3 of the present application can swing under its own gravity, and drive the contact rod 4 to abut against the side wall of the needle connecting rod 6 of the penetration meter to form contact with the needle connecting rod 6. The rotary encoder 5 is electrically connected with the processor, and the processor is electrically connected with the display.

[0033] In use, the calibration mechanism 2 is fixed on the machine head 0 of the penetrator through the mounting frame 1, the contact rod 4 is in contact with the needle connecting rod 6 of the penetrator, the needle connecting rod 6 drives the contact rod 4 to rotate when vertically moving, the rotation data signal of the contact rod 4 is collected by the rotary encoder 5 and sent to the processor, the processor processes the rotation data signal and sends it to the display for presentation, so as to compare with the display data of the penetrator. The present application can quickly and accurately reflect the penetration value of the penetrator, assist the operator to quickly debug the penetrator, and since it is integrally installed on the machine head 0, it does not occupy the detection space below the needle connecting rod 6 of the penetrator, and in the case that the penetrator itself cannot be quickly repaired or calibrated, it can be temporarily used as an external module to statistically analyze experimental data, without affecting the normal operation of the asphalt penetration experiment.

[0034] In order to meet the installation of the swing rod 3, the calibration mechanism 2 further comprises a vertical rod 7, the upper end of the vertical rod 7 is arranged on the mounting frame 1, and the lower end of the vertical rod 7 is arranged on the carrier plate 8. The middle section of the swing rod 3 close to one end is in rotary cooperation with the carrier plate 8, and the other end of the swing rod 3 is provided with the contact rod 4 and the rotary encoder 5.

[0035] In order to realize the front and rear adjustment and height adjustment of the calibration mechanism 2 in space, so that the contact rod 4 can stably contact the side wall of the needle connecting rod 6 of the penetrator, the vertical rod 7 has the functions of front and rear adjustment and lifting adjustment on the mounting frame 1. Figure 3 and 6 In terms of fixation, the mounting frame 1 can comprise a U-shaped fixing plate 13 for clamping on the machine head 0, one side of the fixing plate 13 is provided with a fixing bolt 14 in threaded cooperation 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 on the machine head 0 of the penetrator, and is locked by the fixing bolt 14, and before locking, the level on the fixing plate 13 can be used for horizontal adjustment to ensure the horizontal installation of the fixing plate 13. Of course, other similar fixing methods are also feasible.

[0036] In terms of front and rear adjustment, as Figure 6As shown in FIG, the present invention is provided with a forward-extending T-shaped support plate 16 on the front side of the fixed plate 13. A strip hole 17 extending in the front-to-back direction is provided at the center of the support plate 16. Triangular reinforcement plates 22 may be provided between the T-shaped head of the support plate 16 and the fixed plate 13 on both sides to enhance the stability and structural strength of the support plate 16. An adjustment sleeve 18 is provided within the strip hole 17, forming a sliding fit therewith. The middle section of the adjustment sleeve 18 may serve as a working section, which fits snugly within the strip hole 17 and slides forward and backward along with the strip hole 17. There are many specific structures for locking the front and rear positions. For example, a strip-shaped pin hole extending along the length direction of the strip hole 17 is provided on the support plate 16 corresponding to the side wall of the strip hole 17, and a sliding pin 19 passing through the pin hole is provided on the side wall of the adjustment sleeve 18. The adjustment sleeve 18 is locked on the support plate 16 by a locking nut 20 which is sleeved on the sliding pin 19 and threadedly matched with the sliding pin 19.

[0037] For lifting and lowering adjustment, the center hole of the adjustment sleeve 18 is square, and the upper end of the vertical rod 7 is also square and fits into the center hole of the adjustment sleeve 18. A locking bolt 21 is provided on the side wall of the adjustment sleeve 18. The locking bolt 21 forms a threaded fit with the side wall of the adjustment sleeve 18 and locks the vertical rod 7 into the adjustment sleeve 18 through the locking bolt 21.

[0038] The present invention measures the vertical movement of the needle connecting rod 6 through the cooperation of a rotary encoder 5 and a contact rod 4 mounted on the rocker arm 3. To ensure measurement accuracy and prevent calibration errors caused by the calibration device itself, two sets of rocker arm 3, contact rod 4, and rotary encoder 5 are provided. During measurement, the vertical movement measured by the two sets of rotary encoders 5 should theoretically be consistent. The measurement data from the two sets of contact rods 4 and rotary encoders 5 are mutually verified, thereby improving detection accuracy and further reducing the risk of detection errors caused by improper human operation (for example, errors caused by insufficient levelness of the mounting frame 1 or inadequate contact between the contact rod 4 and the needle connecting rod 6).

[0039] like Figure 3 As shown in , after the present invention is installed in place on the machine head 0, since the installation position of the rocker arm 3 is not in the center, the rocker arm 3 is affected by the gravity of itself and the components installed thereon (contact rod 4, rotary encoder 5), and it can naturally swing 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 rocker arms 3, a connecting rod 9 is provided between the ends of the two rocker arms 3 away from the contact rod 4, and both ends of the connecting rod 9 are in rotational cooperation with the two rocker arms 3.

[0040] In order to make the present invention have the function of time calibration at the same time, a timing module is integrated into the processor. When the rotary encoder 5 generates a feedback signal, the module can be triggered synchronously to ensure the synchronization of timing and displacement. When the test time (5S) is over, in order to achieve the rapid separation of the contact rod 4 and the needle connecting rod 6, a driving member 10 electrically connected to the processor is provided on the carrier plate 8 between the two rocker arms 3. The driving member 10 can form a drive for the rocker arm 3 to swing by pushing the connecting rod 9, so that the contact rod 4 on the rocker arm 3 is separated from the side wall of the needle connecting rod 6. The function of the driving member 10 is to make the rocker arm 3 swing by pushing the connecting rod 9, combined with the rocker arm 3 to swing. Figure 3 、 4 As shown in and 5 , the driving member 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. The side of the connecting rod 9 is provided with a curved edge 12 at a position opposite to the push head 11. When the electromagnetic push rod is extended, it can push the curved edge 12 to the left, thereby causing the rocker 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 the surface of the two to reduce the friction, or the push head 11 can be changed to a wheeled structure to convert the sliding fit into a rolling fit.

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

[0042] A. Install the calibration device on the penetrometer head 0.

[0043] B. Adjust the front and rear position 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 rod 3, the contact rod 4 automatically rests on the side wall of the needle connecting rod 6 and forms contact with the needle connecting rod 6.

[0044] C. Operate the penetrometer to lower the needle connecting rod 6. The contact rod 4 rotates with the movement of the needle connecting rod 6, converting the vertical motion of the needle connecting rod 6 into the rotational motion of the contact rod 4. The rotary encoder 5 collects the rotation signal. The timing module in the processor begins timing when the rotary encoder 5 is triggered. After 5 seconds, the driver 10 drives the pendulum 3 to swing, causing the contact rod 4 at the end of the pendulum 3 to disengage from the needle connecting rod 6.

[0045] The processor calculates the distance traveled by the needle connecting rod 6 in 5 seconds using the data from the rotary encoder 5 revolutions, displays this as measured data on the display. Simultaneously, the penetrometer itself simultaneously measures and counts the distance traveled by the needle connecting rod 6 in 5 seconds, displaying this data on the penetrometer itself.

[0046] D. Determine whether the measured data collected by the two rotary encoders 5 are consistent. If yes, calibrate the penetrometer according to the difference between the measured data and the instrument data. If no, repeat steps B-C, adjust the calibration device and re-measure until the measured data collected by the two rotary encoders 5 are consistent.

Claims

1. A calibration device for an asphalt penetration meter, characterized in that: It comprises a processor, a display, a mounting frame (1) mounted on a head (0) of a penetrometer, and a calibration mechanism (2) arranged on the mounting frame (1); The calibration mechanism (2) has a rocker (3), and a contact rod (4) is provided on the rocker (3) to form a rotational fit with the rocker (3), and the rod shaft of the contact rod (4) is connected to the input end of the rotary encoder (5); the rocker (3) can swing under its own gravity and drive the contact rod (4) to lean against the side wall of the needle connecting rod (6) of the needle penetrometer to form contact with the needle connecting rod (6); the rotary encoder (5) is electrically connected to the processor, and the processor is electrically connected to the display.

2. The calibration device for the asphalt penetration meter according to claim 1, characterized in that: The calibration mechanism (2) further comprises a vertical rod (7), the upper end of which is arranged on the mounting frame (1), and a carrier plate (8) is arranged on the lower end of the vertical rod (7); a middle section of the rocker arm (3) near one end is in rotational engagement with the carrier plate (8), and a contact rod (4) and a rotary encoder (5) are arranged on the other end of the rocker arm (3).

3. The calibration device for the asphalt penetration meter according to claim 2, characterized in that: The rocker rod (3), the contact rod (4) and the rotary encoder (5) are provided in two groups.

4. The calibration device for the asphalt penetration meter according to claim 3, characterized in that: A connecting rod (9) is provided between the ends of the two rocking rods (3) away from the contact rod (4), and both ends of the connecting rod (9) are in rotational cooperation with the two rocking rods (3).

5. The calibration device for the asphalt penetration meter according to claim 4, characterized in that: A timing module is integrated inside the processor, and a driving member (10) electrically connected to the processor is provided on the carrier plate (8) between the two rocker arms (3). The driving member (10) can drive the rocker arm (3) to swing by pushing the connecting rod (9), so that the contact rod (4) on the rocker arm (3) is separated from the side wall of the needle connecting rod (6).

6. The calibration device for the asphalt penetration meter according to claim 5, characterized in that: The driving member (10) is an electromagnetic push rod, the output end of which faces the connecting rod (9) and is provided with a push head (11), and a curved edge (12) is provided on the side of the connecting rod (9) at a position opposite to the push head (11).

7. The calibration device for the asphalt penetration meter according to claim 6, characterized in that: The mounting frame (1) comprises a U-shaped fixing plate (13) for clamping on the machine head (0), a fixing bolt (14) threadedly engaged with the fixing plate (13) is provided on one side of the fixing plate (13), and a clamping head (15) is provided at the inner end of the fixing bolt (14); The front side of the fixing plate (13) is provided with a T-shaped supporting plate (16) extending forward, and the center of the supporting 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 is in sliding engagement with the strip hole (17); a strip-shaped pin hole extending in the length direction of the strip hole (17) is provided on the supporting plate (16) corresponding to the side wall of the strip hole (17); a sliding pin (19) passing through the pin hole is provided on the side wall of the adjusting sleeve (18); and the adjusting sleeve (18) is locked on the supporting plate (16) by a locking nut (20) which is sleeved on the sliding pin (19) and is in threaded engagement with the sliding pin (19).

8. The calibration device for the asphalt penetration meter according to claim 7, 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), and the locking bolt (21) forms a threaded fit with the side wall of the adjusting sleeve (18), and the vertical rod (7) is locked in the adjusting sleeve (18) by the locking bolt (21).

9. The calibration device for an asphalt penetration meter according to claim 8, characterized in that: Triangular reinforcement plates (22) are provided between the two sides of the T-shaped head of the support plate (16) and the fixing plate (13).

10. A calibration method using the asphalt penetration meter calibration device according to any one of claims 1 to 8, characterized in that: The following steps are involved: A. Install the calibration device on the penetrometer head (0); 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 rod (3), the contact rod (4) automatically rests on the side wall of the needle connecting rod (6) and comes into contact with the needle connecting rod (6); C. The needle penetrometer lowers the needle connecting rod (6), and the contact rod (4) rotates following the movement of the needle connecting rod (6), converting the vertical movement of the needle connecting rod (6) into the rotary movement of the contact rod (4), and collecting the rotation signal through the rotary encoder (5); the timing module in the processor starts timing at the same time as the rotary encoder (5) is triggered, and after 5 seconds, the driving member (10) drives the pendulum rod (3) to swing, so that the contact rod (4) at the end of the pendulum rod (3) is separated from the needle connecting rod (6); The processor calculates the movement distance of the needle connecting rod (6) in 5 seconds through the data of the rotation of the rotary encoder (5), and displays it as the measured data on the display; at the same time, the needle penetrometer itself synchronously performs timing and statistics on the movement distance of the needle connecting rod (6) in 5 seconds, and displays it as instrument data on the needle penetrometer; D. Determine whether the measured data collected by the two rotary encoders (5) are consistent; if yes, calibrate the penetrometer 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 measured by the two rotary encoders (5) are consistent.

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