Asphalt penetration tester

Abstract

The invention relates to the technical field of testers, in particular to an asphalt penetration tester. The invention aims to solve the problem of low testing efficiency caused by frequent replacement of a needle head in the testing process of the conventional needle penetration tester. Comprising a test bench main body which is provided with a placing cabin and a driving arm; the sliding rod is mounted in the driving arm, and the driving arm is used for controlling the motion state of the sliding rod; the servo motor is installed on the side, close to the containing bin, of the sliding rod. And the spline shaft is rotationally arranged on the sliding rod and fixedly connected with an output shaft of the servo motor, the spline shaft is provided with a fixing block, the fixing block is slidably installed on the spline shaft, the fixing block is fixedly connected with fixing bases distributed in the circumferential direction, and standard needles are installed in the fixing bases. According to the invention, the plurality of standard needles are mounted on the sliding rod together, and are driven by the servo motor to control the plurality of standard needles to work alternately, so that the downtime is reduced, the test period is shortened, and the test efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of testing instruments, and in particular to an asphalt penetration testing instrument. Background Art

[0002] In the prior art, needle penetration testers are widely used to evaluate the consistency and hardness of semi-solid materials such as asphalt. The penetration test determines the hardness or softness of a material by measuring the depth to which a standard needle penetrates a sample under specific conditions (temperature, time, and load). However, in actual operation, especially when the same sample is tested multiple times, the existing needle penetration testers have the following significant problems: 1. Needle attachment affects test accuracy: After each test, the tip of the standard needle tends to adhere to the sample being tested (such as asphalt). Especially when the test is conducted under high temperature conditions, asphalt is more likely to adhere to the tip of the needle.

[0003] Since the needle is attached with asphalt residue from the previous test, when the test is performed again, these residues will interfere with the normal penetration process of the needle, resulting in inaccurate test results. This error not only affects the accuracy of a single test, but also cumulatively affects the reliability of the results of the entire test batch.

[0004] 2. Frequent replacement of test needles increases operational complexity: In order to ensure the accuracy of the test results, operators usually need to replace the standard needle after each test. This process not only increases the workload, but also prolongs the overall test time. At the same time, frequent needle replacement not only reduces work efficiency, but may also lead to human operating errors, further affecting the consistency and accuracy of the test results. Summary of the invention

[0005] In order to overcome the problems raised in the above background technology, the present invention provides an asphalt penetration tester.

[0006] The technical solution of the present invention is: an asphalt penetration tester, comprising: The main body of the test bench is equipped with a placement bin and a driving arm; A sliding rod, installed in the driving arm, and the driving arm is used to control the movement state of the sliding rod; A servo motor is installed on a side of the sliding rod close to the placement bin; The spline shaft is rotatably arranged on the sliding rod and fixedly connected to the output shaft of the servo motor. A fixed block is slidably mounted on the spline shaft. The fixed block is fixedly connected to a circumferentially distributed fixed seat. A standard needle is installed in the fixed seat.

[0007] Preferably, a weight is installed on a side of the sliding rod away from the fixed block, and weights of different weights are installed on the sliding rod to simulate different load states.

[0008] Preferably, a limit member is slidably arranged inside the sliding rod, a spring is installed between the limit member and the sliding rod, the spline shaft is provided with circumferentially distributed blind holes, the circumferentially distributed blind holes and the circumferentially distributed fixed seats are staggered, and the limit member is located in the adjacent blind hole.

[0009] Preferably, the spline shaft is slidably provided with a first sliding frame, a spring is installed between the first sliding frame and the spline shaft, the first sliding frame is provided with circumferentially distributed oblique grooves, the spline shaft is slidably provided with circumferentially distributed limit rods, the limit rods are in contact with adjacent oblique grooves on the first sliding frame, and the limit rods are used to prevent the fixed block from shaking during testing.

[0010] Preferably, a magnetic block is installed in the fixing seat, and the magnetic block is used to adsorb the adjacent standard needles.

[0011] Preferably, symmetrically distributed elastic members are installed in the fixing seat, and the symmetrically distributed elastic members contact and squeeze the adjacent standard needles, so that the standard needles are kept centered in the adjacent fixing seats during testing.

[0012] Preferably, it also includes: A rotating frame, rotatably disposed in the placement bin, the rotating frame rotatably disposed with a plurality of rotating disks; A first drive motor is mounted on the lower surface of the placement bin, and an output shaft of the first drive motor penetrates the placement bin and the rotating frame and is rotationally connected to both of them, and a transmission wheel in contact with the rotating disk is fixedly connected to the output shaft of the first drive motor; The second drive motor is installed on the lower surface of the placement bin, the output shaft of the second drive motor penetrates the placement bin and is rotationally connected thereto, and the output shaft of the second drive motor is fixedly connected to a transmission wheel in contact with the rotating frame.

[0013] Preferably, the rotating disk is slidingly provided with a second sliding frame, a spring is installed between the second sliding frame and the rotating disk, the rotating disk is slidingly provided with circumferentially distributed clamping jaws, the clamping jaws are provided with guide grooves, and the second sliding frame is slidably connected to the guide grooves of the clamping jaws.

[0014] Preferably, it also includes: A fixed frame is fixedly connected to the driving arm, the fixed frame is slidably provided with two sliding plates, the opposite sides of the two sliding plates are provided with cleaning cotton, the sliding plates are fixedly connected with racks, and the fixed frame is rotatably provided with a gear meshing with the two racks; A driving member is installed on the fixing frame, the driving member is connected to the adjacent racks, and the driving member is used to drive the adjacent racks to move back and forth.

[0015] Preferably, the driving arm is fixedly connected to a liquid storage shell, the liquid storage shell is connected to two conduits, a control valve is installed on the conduit, the other end of the conduit is embedded in the sliding plate, and the port of the conduit is in contact with the cleaning cotton on the sliding plate.

[0016] Compared with the prior art, the present invention has the following advantages: the present invention installs a plurality of standard needles on a sliding rod together, and then cooperates with the drive of a servo motor to control the plurality of standard needles to work alternately, thereby reducing downtime, thereby shortening the test cycle and improving the test efficiency; a limiter is inserted into an adjacent blind hole to ensure that the standard needle remains vertical, thereby improving the accuracy of data during continuous testing; the standard needle is adsorbed by a magnetic block so that the standard needle is quickly installed in place, simplifying the operation and ensuring the accuracy during the test; the standard needle is clamped in the center by an elastic member so that the installed standard needle and the fixing seat remain relatively fixed, and further assists the standard needle to be perpendicular to the asphalt sample during work, thereby improving the accuracy of the test result; the asphalt sample is clamped by a clamping claw so that the asphalt sample remains horizontal, and then cooperates with the drive of a first drive motor and a second drive motor to control the position of the asphalt sample to automatically switch, further simplifying the operation steps, and facilitating the operator to easily start and monitor the test process through a user-friendly interface and a preset program; the standard needle is cleaned by a sliding plate so that the device can continuously detect multiple asphalt samples, thereby improving the test efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the sliding rod and the servo motor of the present invention; Figure 3 It is a cross-sectional view of the sliding rod and the fixed block of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the position-limiting member and the first sliding frame of the present invention; Figure 5 It is a cross-sectional view of the spline shaft and the fixing block of the present invention; Figure 6 It is a cross-sectional view of the placement bin and the rotating frame of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the second sliding frame and the clamping claw of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the fixing frame and the sliding plate of the present invention.

[0018] Figure numerals: 1. test bench body, 2. placement bin, 3. drive arm, 4. sliding rod, 5. servo motor, 6. spline shaft, 7. fixed block, 8. fixed seat, 9. standard needle, 10. limit member, 11. blind hole, 12. first sliding frame, 13. limit rod, 14. magnetic block, 15. elastic member, 16. rotating frame, 17. rotating disk, 18. first drive motor, 19. second drive motor, 20. second sliding frame, 21. clamp, 22. fixed frame, 23. sliding plate, 24. rack, 25. drive member, 26. liquid storage shell, 27. catheter. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0020] Example 1: An asphalt penetration tester, such as Figure 1-Figure 3 As shown, it includes: a test bench body 1, which is equipped with a placement bin 2 and a driving arm 3; a sliding rod 4, which is installed in the driving arm 3, and the driving arm 3 is used to control the movement state of the sliding rod 4; a servo motor 5, which is installed on the side of the sliding rod 4 close to the placement bin 2; a spline shaft 6, which is rotatably set on the sliding rod 4 and is fixedly connected to the output shaft of the servo motor 5, and the spline shaft 6 is slidably installed with a fixed block 7, and the fixed block 7 is fixedly connected with a circumferentially distributed fixed seat 8, and a standard needle 9 is installed in the fixed seat 8; a weight is installed on the side of the sliding rod 4 away from the fixed block 7, and weights of different weights are installed on the sliding rod 4 to simulate different load states.

[0021] In the above scheme, a control terminal is provided in the test bench body 1, and the control terminal is electrically connected to all the electrical components in the present invention. A lighting lamp and an image recognition unit are provided on the upper surface of the test bench body 1, wherein the lighting lamp is used to illuminate the standard needle 9 so that the projection of the standard needle 9 is located on the upper surface of the asphalt sample. When the image recognition unit detects that the tip of the standard needle 9 coincides with the tip of the projection, the tip of the standard needle 9 is flush with the upper surface of the asphalt sample. A water temperature regulating system is provided in the placement bin 2, and the water temperature regulating system is used to control the temperature of the clean water stored in the placement bin 2 so that the water temperature is maintained at a set temperature. A driving unit for driving the sliding rod 4 to move is provided in the driving arm 3, and weights of different weights can be installed on the sliding rod 4 to test the hardness of asphalt under different loads. The fixing seat 8 and the standard needle 9 both have three circumferentially equidistantly distributed ones.

[0022] like Figure 3 and Figure 4As shown, a limit member 10 is slidably arranged inside the sliding rod 4, a spring is installed between the limit member 10 and the sliding rod 4, the spline shaft 6 is provided with circumferentially distributed blind holes 11, the circumferentially distributed blind holes 11 and the circumferentially distributed fixing seats 8 are staggered, and the limit member 10 is located in the adjacent blind holes 11.

[0023] In the above scheme, there are three blind holes 11 equidistantly distributed in the circumferential direction, the lower end of the limit member 10 and the blind hole 11 are both hemispherical, the spring between the limit member 10 and the sliding rod 4 is always in a compressed state, and in the initial state, the limit member 10 is inserted into the adjacent blind hole 11, so that there is a fixed seat 8 on the fixed block 7 and the standard needle 9 is in a vertical state.

[0024] like Figure 3-Figure 5 As shown, the spline shaft 6 is slidably provided with a first sliding frame 12, a spring is installed between the first sliding frame 12 and the spline shaft 6, the first sliding frame 12 is provided with circumferentially distributed oblique grooves, the spline shaft 6 is slidably provided with circumferentially distributed limit rods 13, the limit rods 13 are in contact with the adjacent oblique grooves on the first sliding frame 12, and the limit rods 13 are used to prevent the fixed block 7 from shaking during testing; a magnetic block 14 is installed in the fixed seat 8, and the magnetic block 14 is used to adsorb the adjacent standard needle 9; symmetrically distributed elastic parts 15 are installed in the fixed seat 8, and the symmetrically distributed elastic parts 15 contact and squeeze the adjacent standard needle 9, so as to keep the standard needle 9 centered in the adjacent fixed seat 8 during testing.

[0025] In the above scheme, the limit rod 13 has three circumferentially equidistantly distributed, the spline shaft 6 has three protrusions, and three grooves are arranged in the middle of the fixed block 7. The grooves of the fixed block 7 are in contact with the protrusions on the spline shaft 6. The three grooves on the fixed block 7 are respectively opposite to the three fixed seats 8. The standard needle 9 is centrally installed in the adjacent fixed seat 8, so that the standard needle 9 is opposite to the adjacent grooves on the fixed block 7 and the adjacent protrusions on the spline shaft 6, so that after the fixed block 7 is installed on the spline shaft 6, there is always a standard needle 9 to keep vertical, and the first sliding frame 12 is connected to the spline shaft 6. The spring between the shafts 6 is always in a compressed state, so that in the initial state, the limit rod 13 extends out of the side wall of the spline shaft 6, and the limit rod 13 contacts the fixed block 7 to limit it. The elastic member 15 is composed of a rectangular block and two arc-shaped leaf springs, and the two arc-shaped leaf springs are respectively fixed to the upper and lower sides of the rectangular block. The rectangular block in the middle of the elastic member 15 is provided with an arc-shaped surface in contact with the standard needle 9 to ensure that the standard needle 9 remains centered in the adjacent fixed seat 8. In the initial state, the minimum width between the two elastic members 15 is smaller than the width of the root of the standard needle 9.

[0026] Specific working principle: When using this device to perform asphalt penetration test, first inject clean water into the placing bin 2, and then control the water temperature regulating system in the placing bin 2 through the test bench main body 1 to keep the clean water temperature in the placing bin 2 at the set value, and then place the prepared asphalt sample in the placing bin 2 to keep the asphalt sample at a constant temperature.

[0027] After the asphalt sample is placed, the operator presses the first sliding frame 12, and the first sliding frame 12 moves to compress the connected spring, and the first sliding frame 12 moves to squeeze the three limit rods 13 together in the upper inclined groove, and the limit rod 13 moves to release the contact with the fixed block 7. The operator removes the fixed block 7 from the spline shaft 6, and then the operator installs three standard needles 9 of the same specification in the three fixed seats 8 respectively. The standard needle 9 squeezes the adjacent elastic parts 15 to deform. At the same time, under the attraction of the magnetic block 14 on the standard needle 9, the standard needle 9 quickly contacts the adjacent magnetic block 14, so that the three standard needles 9 are quickly installed in place, simplifying the operation steps and improving the installation accuracy. After the standard needle 9 is installed in place, the two elastic parts 15 at the bottom clamp the standard needle 9 to keep the standard needle 9 centered in the adjacent fixed seats 8.

[0028] After the three standard needles 9 are installed, the operator repeats the above pressing of the first sliding frame 12, reinstalls the fixing block 7 onto the spline shaft 6, and makes the three limiting rods 13 limit the fixing block 7 again. At this time, the standard needle 9 at the bottom remains in a vertical state (as shown in the attached figure). Figure 4 ), the position of the asphalt sample is subsequently adjusted so that it is directly below the standard needle 9. At this time, the standard needle 9 and the upper surface of the asphalt sample are perpendicular to each other.

[0029] After the installation of the three standard needles 9 is completed, the operator starts the driving unit on the driving arm 3 through the control terminal on the test bench main body 1. The driving unit on the driving arm 3 causes the sliding rod 4 to move. The sliding rod 4 moves the lowest standard needle 9 downward together through the spline shaft 6, the fixed block 7 and the fixed seat 8. Under the recognition of the image recognition unit on the test bench main body 1, when the needle tip of the lowest standard needle 9 is located on the upper surface of the asphalt sample, the driving unit on the driving arm 3 stops working, so that the sliding rod 4 is in a stationary state.

[0030] After the standard needle 9 at the bottom is flush with the upper surface of the asphalt sample, the position sensor on the drive arm 3 records the position of the sliding rod 4 and transmits the recorded data to the control terminal of the test bench body 1. Then the operator presses the test button on the test bench body 1, and the drive unit on the drive arm 3 releases the clamping of the sliding rod 4. At the same time, the air bearing on the drive arm 3 works to keep the sliding rod 4 centered in the drive arm 3. Subsequently, under the action of its own weight, the sliding rod 4 inserts the standard needle 9 at the bottom into the asphalt sample through the spline shaft 6, the fixing block 7 and the fixing seat 8. After a specified time, the drive unit on the drive arm 3 resumes the clamping of the sliding rod 4. At the same time, the position sensor in the drive arm 3 records the position of the sliding rod 4 at this time. The hardness of the asphalt is obtained by converting the above-mentioned recorded data into the control terminal in the test bench body 1.

[0031] After the test is completed, the driving unit on the driving arm 3 works, so that the driving arm 3 controls the sliding rod 4 to move upward and reset, and the subsequent control terminal controls the servo motor 5 to work, and the servo motor 5 drives the spline shaft 6 to rotate 120°. The rotation of the spline shaft 6 first squeezes the limit member 10 to move upward and break away from the contact with the adjacent blind hole 11, and the limit member 10 moves to compress the connected spring. After the spline shaft 6 has completed its rotation, the limit member 10 is facing the adjacent blind hole 11 again, and under the elastic force of the spring connected to the limit member 10, the limit member 10 is reinserted into the adjacent blind hole 11 At this time, the spline shaft 6 rotates through the fixed block 7 to drive the three fixed seats 8 and the three standard needles 9 to rotate together, so that the other standard needle 9 rotates to the lowest side. At this time, under the re-limitation of the limit piece 10, the standard needle 9 remains vertical after swinging, thereby ensuring the accuracy of the test results. The subsequent operator rotates the asphalt sample and then repeats the above-mentioned needle penetration test operation until three test operations are completed. The three test results are averaged to further improve the accuracy of the measured data. At the same time, continuous operation reduces downtime, thereby shortening the test cycle.

[0032] Embodiment 2: Based on embodiment 1, Figure 1 , Figure 6 and Figure 7 As shown, it also includes: a rotating frame 16, which is rotatably arranged in the placement bin 2, and the rotating frame 16 is rotatably arranged with a plurality of rotating disks 17; a first drive motor 18, which is installed on the lower surface of the placement bin 2, and the output shaft of the first drive motor 18 penetrates the placement bin 2 and the rotating frame 16 and is rotatably connected to both, and the output shaft of the first drive motor 18 is fixedly connected to a transmission wheel in contact with the rotating disk 17; a second drive motor 19, which is installed on the lower surface of the placement bin 2, and the output shaft of the second drive motor 19 penetrates the placement bin 2 and is rotatably connected thereto, and the output shaft of the second drive motor 19 is fixedly connected to a transmission wheel in contact with the rotating frame 16; the rotating disk 17 is slidingly arranged with a second sliding frame 20, a spring is installed between the second sliding frame 20 and the rotating disk 17, the rotating disk 17 is slidingly arranged with circumferentially distributed clamping jaws 21, the clamping jaws 21 are provided with guide grooves, and the second sliding frame 20 is slidably connected with the guide grooves of the clamping jaws 21.

[0033] In the above scheme, there are two rotating disks 17 and two second sliding frames 20, and eight clamps 21, in which four clamps 21 form a group, and the guide grooves on the four adjacent clamps 21 gradually move away from each other from top to bottom. The number of parts in the device can be equipped according to actual needs, so that the device can continuously detect multiple asphalt samples, so as to reduce the energy consumption of testing multiple samples and improve the testing efficiency of the device.

[0034] Specific working principle: when testing the asphalt sample, the operator places the asphalt sample on the second sliding frame 20. Under the gravity of the asphalt sample, the asphalt sample squeezes the second sliding frame 20 downward, and the second sliding frame 20 moves downward to compress the connected spring. During the downward movement of the second sliding frame 20, it squeezes the guide grooves of adjacent clamping jaws 21, so that the four adjacent clamping jaws 21 are close together to clamp the asphalt sample. Then the control terminal controls the second drive motor 19 to work, and the second drive motor 19 drives the rotating frame 16 to rotate through the transmission wheel. The rotating frame 16 drives the two rotating disks 17 to rotate circumferentially. After the rotating disk 17 with the asphalt sample is placed rotates to the bottom of the standard needle 9, the second drive motor 19 stops working. The above operation is subsequently repeated to control the movement of the standard needle 9 for testing. After completing a test of experimental data, the control terminal starts the first drive motor 18. The first drive motor 18 drives the rotating disk 17 to rotate through the transmission wheel. The rotating disk 17 rotates through the four adjacent jaws 21 to drive the asphalt sample to rotate. After the rotation angle, the first drive motor 18 stops working. The above operation is subsequently repeated to perform multiple tests. The automatic adjustment of the asphalt sample during the test, combined with the circular use of the three standard needles 9, allows the operator to easily start and monitor the test process through a user-friendly interface and preset programs. There is no need for complicated operating steps, which further simplifies the overall operating process.

[0035] Embodiment 3: Based on embodiment 2, Figure 1 and Figure 8 As shown, it also includes: a fixed frame 22, which is fixedly connected to the driving arm 3, and the fixed frame 22 is slidably provided with two sliding plates 23, and cleaning cotton is arranged on the opposite sides of the two sliding plates 23, and the sliding plate 23 is fixedly connected with a rack 24, and the fixed frame 22 is rotatably provided with a gear meshing with the two racks 24; a driving member 25, which is installed on the fixed frame 22, and the driving member 25 is connected to the adjacent racks 24, and the driving member 25 is used to drive the adjacent racks 24 to reciprocate; the driving arm 3 is fixedly connected with a liquid storage shell 26, and the liquid storage shell 26 is connected with two conduits 27, and a control valve is installed on the conduit 27, and the other end of the conduit 27 is embedded in the sliding plate 23, and the port of the conduit 27 is in contact with the cleaning cotton on the sliding plate 23.

[0036] In the above scheme, the driving member 25 is an electric push rod, the facing sides of the two sliding plates 23 are in contact, and the upper and lower sides of the two sliding plates 23 are provided with inclined surfaces to facilitate the standard needle 9 to swing between the two sliding plates 23, and the liquid storage shell 26 stores the solution for cleaning asphalt.

[0037] Specific working principle: After the device completes a test, after the sliding rod 4 moves up and resets, as the servo motor 5 works, the standard needle 9 under test is controlled to swing between the two sliding plates 23, and then the control terminal briefly opens the control valve on the conduit 27 to allow part of the solution to enter the cleaning cotton of the sliding plate 23. At the same time, the control terminal starts the driving member 25, and the telescopic end of the driving member 25 drives the adjacent rack 24 and the adjacent sliding plate 23 to move back and forth. The rack 24 drives another rack 24 and the sliding plate 23 to move back and forth together through the gear, and finally the two sliding plates 23 move back and forth relative to each other to rub the standard needle 9 and clean the standard needle 9, which is convenient for the device to continuously detect multiple asphalt samples and further improve the testing efficiency of the device.

[0038] It should be pointed out that the above preferred embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An asphalt penetration tester, characterized in that: Included are: The test bench body (1) is equipped with a placement bin (2) and a driving arm (3); A sliding rod (4) is installed in the driving arm (3), and the driving arm (3) is used to control the movement state of the sliding rod (4); A servo motor (5) is mounted on a side of the sliding rod (4) close to the placement bin (2); The spline shaft (6) is rotatably mounted on the sliding rod (4) and is fixedly connected to the output shaft of the servo motor (5). A fixed block (7) is slidably mounted on the spline shaft (6). The fixed block (7) is fixedly connected to a circumferentially distributed fixed seat (8). A standard needle (9) is installed in the fixed seat (8).

2. The asphalt penetration tester according to claim 1, characterized in that: A weight is installed on a side of the sliding rod (4) away from the fixed block (7), and weights of different weights are installed on the sliding rod (4) to simulate different load states.

3. The asphalt penetration tester according to claim 2, characterized in that: A limit member (10) is slidably arranged inside the sliding rod (4), a spring is installed between the limit member (10) and the sliding rod (4), the spline shaft (6) is provided with circumferentially distributed blind holes (11), the circumferentially distributed blind holes (11) and the circumferentially distributed fixing seats (8) are arranged in a staggered manner, and the limit member (10) is located in an adjacent blind hole (11).

4. The asphalt penetration tester according to claim 3, characterized in that: The spline shaft (6) is slidably provided with a first sliding frame (12), a spring is installed between the first sliding frame (12) and the spline shaft (6), the first sliding frame (12) is provided with circumferentially distributed oblique grooves, the spline shaft (6) is slidably provided with circumferentially distributed limiting rods (13), the limiting rods (13) are in contact with adjacent oblique grooves on the first sliding frame (12), and the limiting rods (13) are used to prevent the fixed block (7) from shaking during testing.

5. The asphalt penetration tester according to claim 4, characterized in that: A magnetic block (14) is installed in the fixing seat (8), and the magnetic block (14) is used to adsorb the adjacent standard needle (9).

6. The asphalt penetration tester according to claim 5, characterized in that: Symmetrically distributed elastic members (15) are installed in the fixing seat (8), and the symmetrically distributed elastic members (15) contact and squeeze the adjacent standard needles (9), so that the standard needles (9) are kept centered in the adjacent fixing seats (8) during testing.

7. The asphalt penetration tester according to claim 6, characterized in that: Also included are: A rotating frame (16) is rotatably disposed in the storage bin (2), and the rotating frame (16) is rotatably disposed with a plurality of rotating disks (17); A first drive motor (18) is mounted on the lower surface of the placement bin (2), and an output shaft of the first drive motor (18) penetrates the placement bin (2) and the rotating frame (16) and is rotationally connected to both of them, and the output shaft of the first drive motor (18) is fixedly connected to a transmission wheel in contact with the rotating disk (17); A second drive motor (19) is mounted on the lower surface of the placement bin (2); an output shaft of the second drive motor (19) penetrates the placement bin (2) and is rotationally connected thereto; and the output shaft of the second drive motor (19) is fixedly connected to a transmission wheel in contact with the rotating frame (16).

8. The asphalt penetration tester according to claim 7, characterized in that: The rotating disk (17) is provided with a second sliding frame (20) in a limited sliding manner, a spring is installed between the second sliding frame (20) and the rotating disk (17), the rotating disk (17) is provided with circumferentially distributed clamping claws (21) in a sliding manner, the clamping claws (21) are provided with guide grooves, and the second sliding frame (20) is slidably connected to the guide grooves of the clamping claws (21).

9. The asphalt penetration tester according to claim 8, characterized in that: Also included are: A fixed frame (22) is fixedly connected to the driving arm (3), the fixed frame (22) is slidably provided with two sliding plates (23), cleaning cotton is provided on the opposite sides of the two sliding plates (23), the sliding plates (23) are fixedly connected with racks (24), and the fixed frame (22) is rotatably provided with gears meshing with the two racks (24); A driving member (25) is mounted on the fixing frame (22), the driving member (25) is connected to the adjacent rack (24), and the driving member (25) is used to drive the adjacent rack (24) to move back and forth.

10. The asphalt penetration tester according to claim 9, characterized in that: The driving arm (3) is fixedly connected to a liquid storage shell (26), and the liquid storage shell (26) is connected to two conduits (27). A control valve is installed on the conduit (27), and the other end of the conduit (27) is embedded in the sliding plate (23), and the port of the conduit (27) is in contact with the cleaning cotton on the sliding plate (23).

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