A device for detecting the viscosity of modified asphalt

Abstract

The application relates to the technical field of new material detection, in particular to a modified asphalt viscosity detection device, which comprises a base; a lifting adjusting mechanism fixedly installed on the top surface of the base, wherein the lifting adjusting mechanism comprises a lifting seat; a furnace heater fixedly installed on the top surface of the base and used for heating and heat-insulating asphalt; a loading cup used in cooperation with the furnace heater and used for containing asphalt; a viscometer main body fixedly connected with the lifting seat, wherein the viscometer main body is provided with a control module; and a rotor mechanism fixedly connected with the output end of the viscometer main body, wherein the rotor mechanism comprises a main rotor used for detecting the viscosity of asphalt and an auxiliary detection assembly used for eliminating the cavity formed when the main rotor rotates in the asphalt; the auxiliary detection assembly is arranged, the cavity possibly formed when the main rotor rotates can be avoided, the torque monitoring distortion caused by the cavity can be avoided, and the problem that the detection result of high-viscosity modified asphalt is inaccurate in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of new material testing technology, and more particularly to the field of asphalt viscosity testing equipment technology, specifically a modified asphalt viscosity testing device. Background Technology

[0002] Modified asphalt refers to asphalt binder with excellent properties formed by adding modifiers such as rubber, resin, polymer, finely ground rubber powder, or other fillers to base asphalt and mixing them uniformly. Through modification, it can significantly improve the high-temperature stability, low-temperature crack resistance, and aging resistance of base asphalt, and is widely used in highway and bridge paving projects. Viscosity is one of the key performance indicators of modified asphalt, directly affecting its construction and performance in use.

[0003] The Brinell viscometer is a commonly used device for testing asphalt viscosity. It works by driving a rotor to rotate in asphalt using a motor, and a torque sensor detects the resistance torque acting on the rotor to calculate the asphalt viscosity. However, existing Brinell viscometers have the following shortcomings when testing modified asphalt with higher viscosity:

[0004] Due to the poor fluidity of high-viscosity modified asphalt, the asphalt surrounding the rotor cannot quickly fill the space created by the rotor's rotation due to its hysteresis, easily forming a cavity effect around the rotor. Simultaneously, the asphalt on the rotor's sides is only subjected to unidirectional shear force, easily forming alternating "accumulation-stripping" cavities at the edges. Furthermore, due to the polymer aggregation characteristics of high-viscosity asphalt, these cavities are difficult to dissipate on their own. These cavities cause abnormal resistance torque on the rotor, leading to distortion in torque sensor monitoring and inaccurate detection results that fail to accurately reflect the viscosity characteristics of the modified asphalt. Summary of the Invention

[0005] The purpose of this invention is to provide a modified asphalt viscosity testing device to solve the problems mentioned in the background art.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A modified asphalt viscosity testing device, comprising:

[0008] Base;

[0009] A lifting adjustment mechanism is fixedly installed on the top surface of the base, the lifting adjustment mechanism including a lifting seat;

[0010] A furnace-type heater is fixedly installed on the top surface of the base for heating and insulating asphalt;

[0011] A loading cup used in conjunction with the furnace heater is used to hold asphalt;

[0012] A viscometer body fixedly connected to the lifting seat, wherein a control module is provided in the viscometer body;

[0013] The viscometer body is fixedly connected to the output end of the rotor mechanism, which includes a main rotor for detecting asphalt viscosity and an auxiliary detection component. The auxiliary detection component is used to eliminate cavities formed when the main rotor rotates in the asphalt.

[0014] Furthermore, the viscometer body includes a motor and a torque sensor. The motor is integrated at the bottom of the viscometer body, and the output shaft of the motor is fixedly connected to the input shaft of the torque sensor.

[0015] The front of the viscometer body is equipped with a control panel.

[0016] Furthermore, the auxiliary detection component includes a gear ring horizontally positioned directly below the torque sensor, and a connecting rod is fixedly connected between the outer periphery of the gear ring and the bottom of the viscometer body;

[0017] A disc is rotatably mounted on the bottom end of the gear ring. A sun gear is located at the center of the top surface of the disc. A hollow shaft is fixedly mounted through the top surface of the sun gear. The bottom end of the hollow shaft rotates through the disc to the bottom of the disc. An axially limited and circumferentially rotatable main shaft is installed in the hollow shaft. The top end of the main shaft is fixedly connected to the output end of the torque sensor. The bottom end of the main shaft extends to the outside of the hollow shaft and is detachably fixedly connected to the main rotor through a threaded sleeve.

[0018] Three planetary gears arranged in a circumferential array are also provided between the inner sides of the sun gear and the gear ring. The planetary gears mesh with both the sun gear and the gear ring. A hollow shaft II is fixedly connected to the bottom end of the planetary gear. The bottom end of the hollow shaft II rotates through the disk to the bottom of the disk. An auxiliary rotor assembly is installed on the planetary gear.

[0019] A drive assembly that is connected to the hollow shaft is fixedly mounted on the gear ring.

[0020] Furthermore, the auxiliary rotor assembly includes a second motor fixedly mounted on the top surface of the planetary gear. The output shaft of the second motor is fixedly connected to a secondary rotor. The bottom end of the secondary rotor passes through the hollow shaft to the bottom of the hollow shaft and is detachably fixedly connected to the auxiliary rotor via a threaded sleeve.

[0021] Furthermore, the drive assembly includes a motor mount fixedly mounted on the top surface of the gear ring and a driven pulley fixedly mounted on the periphery of the hollow shaft near the top.

[0022] A motor three is fixedly mounted on the motor base, and a drive pulley is fixedly mounted on the output shaft end of the motor three. A synchronous belt is installed between the drive pulley and the driven pulley.

[0023] Furthermore, the lifting adjustment mechanism includes a vertical plate fixedly installed on the top surface of the base, a fixed seat fixedly installed at the top of the vertical plate, a lead screw rotatably installed between the fixed seat and the top surface of the base, and two guide rods fixedly connected between the fixed seat and the top surface of the base; a knob is fixedly installed at the top of the lead screw after it rotatably passes through the fixed seat.

[0024] The lifting seat is threaded through the periphery of the lead screw, and the lifting seat is slidably connected through the two guide rods.

[0025] The end of the lifting seat away from the vertical plate is fixedly connected to the back of the viscometer body.

[0026] Furthermore, the top surface of the furnace heater has two symmetrically distributed positioning grooves.

[0027] Furthermore, two symmetrically arranged protrusions are fixedly connected to the periphery of the loading cup near the top, and a positioning rod that cooperates with the positioning groove is fixedly connected to the bottom surface of the protrusions.

[0028] The beneficial effects of this invention are:

[0029] 1. By setting up auxiliary detection components, this invention can avoid cavities that may be formed when the main rotor rotates, thereby avoiding torque monitoring distortion caused by cavities and solving the problem of inaccurate detection results of high viscosity modified asphalt in the prior art.

[0030] 2. This invention regulates the operating parameters of the three auxiliary rotors through a control module, simulating different engineering environmental conditions. By simulating the fluid stress state in actual application scenarios, the detected viscosity values ​​more closely resemble the performance of modified asphalt in actual engineering, providing more valuable data for engineering design and construction.

[0031] 3. In this invention, the piezoelectric film sensor is installed in the mounting groove at the bottom of the main rotor to monitor the asphalt pressure on the bottom of the main rotor in real time, and converts the pressure signal into an electrical signal and transmits it to the control module in the viscometer body, thereby regulating the rotor mechanism, realizing the dynamic elimination of the cavity, and further ensuring the stability of the detection process and the reliability of the results. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0034] Figure 2 This is a three-dimensional schematic diagram of the lifting and adjusting mechanism in this invention;

[0035] Figure 3 yes Figure 2 Enlarged view of section A;

[0036] Figure 4 This is a three-dimensional schematic diagram of the connection relationship between the viscometer body and the rotor mechanism in this invention;

[0037] Figure 5 yes Figure 4 Enlarged view of section B;

[0038] Figure 6 This is a three-dimensional schematic diagram of the rotor mechanism in this invention;

[0039] Figure 7 This is a schematic diagram of the main rotor in this invention;

[0040] Figure 8 yes Figure 6 A three-dimensional diagram from another angle;

[0041] Figure 9 yes Figure 8 Enlarged view of section C;

[0042] The attached figures are labeled as follows:

[0043] 1-Base, 2-Lifting and Adjusting Mechanism, 3-Furnace Heater, 4-Viscometer Body, 5-Rotor Mechanism, 6-Loading Cup, 7-Protrusion, 8-Positioning Rod, 9-Positioning Groove, 10-Upright Plate, 11-Fixed Seat, 12-Guide Rod, 13-Screw Screw, 14-Lifting Seat, 15-Knob, 16-Connecting Rod, 17-Motor 1, 18-Torque Sensor, 19-Main Shaft, 20-Gear Ring, 21-Disc, 22-Planetary Gear, 23-Motor 2, 24-Sun Gear, 25-Hollow Shaft 1, 26-Driven Pulley, 27-Synchronous Belt, 28-Drive Pulley, 29-Motor Seat, 30-Motor 3, 31-Main Rotor, 32-Auxiliary Rotor, 33-Hollow Shaft 2, 34-Secondary Shaft, 35-Mounting Groove, 36-Piezoelectric Film Sensor. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example 1:

[0046] Please see Figure 1 and Figure 2 In this embodiment of the invention, a modified asphalt viscosity testing device includes:

[0047] Base 1;

[0048] A lifting adjustment mechanism 2 is fixedly installed on the top surface of the base 1. The lifting adjustment mechanism 2 includes a lifting seat 14.

[0049] A furnace heater 3, fixedly installed on the top surface of the base 1, is used to heat and insulate asphalt;

[0050] The loading cup 6, used in conjunction with the furnace heater 3, is used to hold asphalt;

[0051] The viscometer body 4 is fixedly connected to the lifting seat 14, and a control module is provided in the viscometer body 4.

[0052] And a rotor mechanism 5 fixedly connected to the output end of the viscometer body 4. The rotor mechanism 5 includes a main rotor 31 for detecting the viscosity of asphalt and an auxiliary detection component. The auxiliary detection component is used to eliminate the cavity formed when the main rotor 31 rotates in the asphalt.

[0053] In this invention, the modified asphalt to be tested is poured into the loading cup 6, and then the loading cup 6 is installed in the furnace heater 3. The furnace heater 3 heats and keeps the asphalt in the loading cup 6 to a specified temperature. Then, the lifting adjustment mechanism 2 drives the lifting seat 14 to descend, so that the viscometer body 4 drives the rotor mechanism 5 to extend into the loading cup 6, thereby realizing the detection of the viscosity of the modified asphalt.

[0054] Among them, the furnace heater 3 adopts an embedded integral electric heating method, which provides uniform heating and low thermal inertia. The temperature controller adopts self-tuning PID adjustment technology, which provides precise temperature control. It can be used to determine the dynamic viscosity of high-temperature molten materials such as asphalt, which is the existing technology.

[0055] Example 2:

[0056] Please see Figure 1 , Figure 2 , Figures 4-6 , Figure 8 and Figure 9Based on Example 1, the viscometer body 4 includes a motor 17 and a torque sensor 18. The motor 17 is integrated at the bottom of the viscometer body 4, and the output shaft of the motor 17 is fixedly connected to the input shaft of the torque sensor 18.

[0057] The front of the viscometer body 4 is equipped with a control panel that integrates functions such as temperature control, motor parameter adjustment, and data display.

[0058] The auxiliary detection component includes a gear ring 20 horizontally positioned directly below the torque sensor 18, and a connecting rod 16 is fixedly connected between the outer periphery of the gear ring 20 and the bottom of the viscometer body 4.

[0059] A disc 21 is rotatably mounted on the bottom end of the gear ring 20. A sun gear 24 is set at the center of the top surface of the disc 21. A hollow shaft 25 is fixedly mounted through the top surface of the sun gear 24. The bottom end of the hollow shaft 25 rotatably passes through the disc 21 to the bottom of the disc 21. An axially limited and circumferentially rotatable main shaft 19 is installed in the hollow shaft 25. The top end of the main shaft 19 is fixedly connected to the output end of the torque sensor 18. The bottom end of the main shaft 19 extends to the outside of the hollow shaft 25 and is detachably fixedly connected to the main rotor 31 through a threaded sleeve.

[0060] Three planetary gears 22 arranged in a circumferential array are also provided between the inner sides of the sun gear 24 and the gear ring 20. The planetary gears 22 mesh with the sun gear 24 and the gear ring 20 at the same time. A hollow shaft 33 is fixedly connected to the bottom end of the planetary gears 22. The bottom end of the hollow shaft 33 rotates through the disk 21 to the bottom of the disk 21. An auxiliary rotor assembly is installed on the planetary gears 22.

[0061] A drive assembly that is connected to the hollow shaft 25 is fixedly mounted on the gear ring 20.

[0062] The auxiliary rotor assembly includes a second motor 23 fixedly mounted on the top surface of the planetary gear 22. The output shaft of the second motor 23 is fixedly connected to a secondary rotor 34. The bottom end of the secondary rotor 34 passes through the hollow shaft 23 to the bottom of the hollow shaft 23 and is detachably fixedly connected to the auxiliary rotor 32 through a threaded sleeve.

[0063] The main rotor 31 and the main shaft 19, as well as the auxiliary rotor 32 and the secondary rotor 34, are detachably connected by threaded sleeves, which facilitates the replacement of rotors of corresponding specifications according to modified asphalt with different viscosity ranges, thereby improving the adaptability of the device. At the same time, the detachable structure also facilitates the cleaning, maintenance and replacement of parts, reducing maintenance costs.

[0064] The drive assembly includes a motor mount 29 fixedly mounted on the top surface of the gear ring 20 and a driven pulley 26 fixedly mounted on the periphery of the hollow shaft 25 near the top.

[0065] A motor 30 is fixedly mounted on the motor base 29. A drive pulley 28 is fixedly mounted on the output shaft end of the motor 30. A synchronous belt 27 is installed between the drive pulley 28 and the driven pulley 26.

[0066] The lifting adjustment mechanism 2 includes a vertical plate 10 fixedly installed on the top surface of the base 1, a fixed seat 11 fixedly installed on the top of the vertical plate 10, a screw rod 13 rotatably installed between the fixed seat 11 and the top surface of the base 1, and two guide rods 12 fixedly connected between the fixed seat 11 and the top surface of the base 1; a knob 15 is fixedly installed after the top of the screw rod 13 rotates through the fixed seat 11.

[0067] A lifting seat 14 is installed on the periphery of the lead screw 13 through a thread, and the lifting seat 14 is slidably connected to the two guide rods 12 through a thread.

[0068] The end of the lifting seat 14 away from the vertical plate 10 is fixedly connected to the back of the viscometer body 4.

[0069] Specifically:

[0070] Rotating the screw 13 by the knob 15 causes the lifting seat 14 to move up and down under the limiting action of the two guide rods 12; during testing, the viscometer body 4 is lowered so that the detection part of the rotor mechanism 5 extends into the asphalt in the loading cup 6.

[0071] In rotor mechanism 5, the main rotor 31 and three auxiliary rotors 32 extend into the loading cup 6. Motor 17 drives the main rotor 31 to rotate through torque sensor 18 and main shaft 19. The rotational resistance of the main rotor 31 forms torque, which is sensed by torque sensor 18, thereby obtaining the viscosity value of modified asphalt. While the main rotor 31 is rotating, motor 30 drives hollow shaft 25 to rotate through drive pulley 28, synchronous belt 27 and driven pulley 26. Hollow shaft 25 drives sun gear 24 to rotate, so that the three planetary gears 22 revolve around sun gear 24. The direction of revolution is opposite to the direction of rotation of the main rotor 31. Motor 23 drives the auxiliary rotors 32 to rotate through secondary rotor 34, so that the three auxiliary rotors 32 rotate on their own axis while revolving around the sun gear. The speed and direction of revolution are controlled by motor 30, and the speed and direction of rotation are controlled by motor 23.

[0072] This invention, by setting up an auxiliary detection component, includes three circumferentially arrayed auxiliary rotors 32, which revolve in opposite directions around the main rotor 31 under the drive of motor 30, generating radial thrust to push the peripheral asphalt around the main rotor 31. At the same time, under the drive of motor 23, they rotate on their own, breaking down the asphalt's shear resistance barrier and directly filling the cavities that may be formed when the main rotor 31 rotates, avoiding torque monitoring distortion caused by cavities, and solving the problem of inaccurate detection results of high viscosity modified asphalt in the prior art.

[0073] Furthermore, by adjusting the operating parameters of the three auxiliary rotors 32 through the control module, different engineering environmental conditions can be simulated. For example, adjusting the revolution and rotation speeds of the auxiliary rotors 32 can simulate the shear rate of the asphalt paver during construction; changing the steering combination of the auxiliary rotors 32 can simulate the dynamic effect of vehicle loads on asphalt under different road conditions. By simulating the fluid stress state in actual application scenarios, the detected viscosity values ​​are closer to the performance of modified asphalt in actual engineering, providing more valuable data for engineering design and construction.

[0074] Example 3:

[0075] Please see Figure 7 Based on embodiment 2, the bottom end of the main rotor 31 is provided with a mounting groove 35, and a piezoelectric film sensor 36 is installed in the mounting groove 35 near the bottom to seal the mounting groove 35.

[0076] A piezoelectric membrane sensor 36 is installed in the mounting groove 35 at the bottom of the main rotor 31. It monitors the asphalt pressure on the bottom of the main rotor 31 in real time and converts the pressure signal into an electrical signal, which is then transmitted to the control module inside the viscometer body 4. The control module presets a normal pressure threshold range. When the received pressure signal is below the threshold (indicating cavity formation), the control module sends adjustment signals to motor 30 (which controls the revolution of the auxiliary rotor 32) and motor 23 (which controls the rotation of the auxiliary rotor 32). Motor 30 adjusts its output speed and direction according to the signal, changing the revolution parameters of the auxiliary rotor 32. Motor 23 adjusts its output speed and direction according to the signal, changing the rotation parameters of the auxiliary rotor 32, until the pressure detected by the piezoelectric membrane sensor 36 returns to the normal range, at which point the control module stops adjusting. This achieves dynamic elimination of cavities, further ensuring the stability of the detection process and the reliability of the results.

[0077] In the above-mentioned collaborative process, the signal acquisition of the piezoelectric film sensor 36, the reception and analysis of the signal by the control module (comparison threshold), and the logic of the control module sending control commands to the motor are all conventional "sensor-controller-actuator" closed-loop control methods in the field. The specific circuit connection and signal processing algorithm (such as threshold comparison, PID adjustment, etc.) are known to those skilled in the art and are existing technologies.

[0078] Meanwhile, the function of motor 17 is to drive the main shaft 19 and the main rotor 31 to rotate. Its operating parameters (such as speed) can be preset by the control panel and adjusted by the control module. This adjustment logic is also common in existing technology.

[0079] Example 4:

[0080] Please see Figure 2 and Figure 3Based on Example 3, the top surface of the furnace heater 3 has two symmetrically distributed positioning grooves 9.

[0081] Two symmetrically arranged protrusions 7 are fixedly connected to the outer periphery of the loading cup 6 near the top. The bottom surface of the protrusions 7 is fixedly connected to a positioning rod 8 that works with the positioning groove 9.

[0082] The positioning groove 9 on the top surface of the furnace heater 3 cooperates with the positioning rod 8 of the loading cup 6 to circumferentially limit the loading cup 6 and prevent the loading cup 6 from shifting during the testing process.

[0083] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A modified asphalt viscosity testing device, characterized in that, include: Base (1); A lifting adjustment mechanism (2) is fixedly installed on the top surface of the base (1), and the lifting adjustment mechanism (2) includes a lifting seat (14). A furnace heater (3) is fixedly installed on the top surface of the base (1) for heating and insulating asphalt; The loading cup (6) used in conjunction with the furnace heater (3) is used to hold asphalt; The viscometer body (4) is fixedly connected to the lifting seat (14), and a control module is provided in the viscometer body (4); The rotor mechanism (5) is fixedly connected to the output end of the viscometer body (4). The rotor mechanism (5) includes a main rotor (31) for detecting the viscosity of asphalt and an auxiliary detection component. The auxiliary detection component is used to eliminate the cavity formed when the main rotor (31) rotates in the asphalt. The viscometer body (4) includes a motor (17) and a torque sensor (18). The motor (17) is integrated at the bottom of the viscometer body (4), and the output shaft of the motor (17) is fixedly connected to the input shaft of the torque sensor (18). The front of the viscometer body (4) is provided with a control panel; The auxiliary detection component includes a gear ring (20) horizontally positioned directly below the torque sensor (18), and a connecting rod (16) is fixedly connected between the outer periphery of the gear ring (20) and the bottom of the viscometer body (4). A disc (21) is rotatably mounted on the bottom end of the gear ring (20). A sun gear (24) is provided at the center of the top surface of the disc (21). A hollow shaft (25) is fixedly mounted through the top surface of the sun gear (24). The bottom end of the hollow shaft (25) rotatably passes through the disc (21) to the bottom of the disc (21). An axially limited and circumferentially rotatable main shaft (19) is installed in the hollow shaft (25). The top end of the main shaft (19) is fixedly connected to the output end of the torque sensor (18). The bottom end of the main shaft (19) extends to the outside of the hollow shaft (25) and is detachably fixedly connected to the main rotor (31) through a threaded sleeve. Three planetary gears (22) arranged in a circumferential array are also provided between the inner sides of the sun gear (24) and the gear ring (20). The planetary gears (22) mesh with both the sun gear (24) and the gear ring (20). A hollow shaft (33) is fixedly connected to the bottom end of the planetary gears (22). The bottom end of the hollow shaft (33) rotates through the disk (21) to the bottom of the disk (21). An auxiliary rotor assembly is installed on the planetary gears (22). A drive assembly that is connected to the hollow shaft (25) is fixedly installed on the gear ring (20); The auxiliary rotor assembly includes a second motor (23) fixedly mounted on the top surface of the planetary gear (22). The output shaft of the second motor (23) is fixedly connected to a secondary rotor (34). The bottom end of the secondary rotor (34) passes through the hollow shaft (33) to the bottom of the hollow shaft (33) and is detachably fixedly connected to the auxiliary rotor (32) by a threaded sleeve.

2. The modified asphalt viscosity testing device according to claim 1, characterized in that, The drive assembly includes a motor mount (29) fixedly mounted on the top surface of the gear ring (20) and a driven pulley (26) fixedly mounted on the periphery of the hollow shaft (25) near the top. A motor three (30) is fixedly installed on the motor base (29). A drive pulley (28) is fixedly installed on the output shaft end of the motor three (30). A synchronous belt (27) is installed between the drive pulley (28) and the driven pulley (26).

3. The modified asphalt viscosity testing device according to claim 1, characterized in that, The lifting adjustment mechanism (2) includes a vertical plate (10) fixedly installed on the top surface of the base (1). A fixed seat (11) is fixedly installed on the top of the vertical plate (10). A screw rod (13) is rotatably installed between the fixed seat (11) and the top surface of the base (1). Two guide rods (12) are also fixedly connected between the fixed seat (11) and the top surface of the base (1). A knob (15) is fixedly installed after the top of the screw rod (13) rotates through the fixed seat (11). The lifting seat (14) is installed on the periphery of the lead screw (13) through a threaded connection, and the lifting seat (14) is slidably connected to the two guide rods (12). The end of the lifting seat (14) away from the vertical plate (10) is fixedly connected to the back of the viscometer body (4).

4. The modified asphalt viscosity testing device according to claim 1, characterized in that, The top surface of the furnace heater (3) has two symmetrically distributed positioning grooves (9).

5. The modified asphalt viscosity testing device according to claim 4, characterized in that, Two symmetrically arranged protrusions (7) are fixedly connected to the outer periphery of the loading cup (6) near the top. The bottom surface of the protrusions (7) is fixedly connected to a positioning rod (8) that cooperates with the positioning groove (9).

6. The modified asphalt viscosity testing device according to claim 5, characterized in that, The main rotor (31) has a mounting groove (35) at its bottom end, and a piezoelectric film sensor (36) is installed in the mounting groove (35) near the bottom to seal the mounting groove (35).

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