CN115201032B - A portable asphalt dynamic shear rheometer - Google Patents

Abstract

The invention provides a portable asphalt dynamic shear rheometer, and belongs to the technical field of asphalt rheological property testing equipment. The asphalt dynamic shear rheometer comprises a mechanical structure module and a driving acquisition module. Wherein: the mechanical structure module comprises an actuating module, a clamping module and a displacement adjusting module; the actuating module comprises a grating encoder, a stepping motor, a torque sensor and a lower shell; the clamping module comprises a sample upper clamp, a sample lower clamp and a temperature sensor; the displacement adjusting module comprises a concentric adjusting mechanism, a sample thickness adjusting mechanism and a limiting block; the drive acquisition module comprises a closed-loop motor driver, a high-speed torque acquisition card and a PID temperature controller. The invention has the advantages of convenient carrying, low price and strong scene applicability. The method can be applied to the construction process for rapidly detecting the rheological property of the asphalt material, can be used for carrying out in-situ test in combination with other microstructure test equipment, and has important significance in evaluating and optimizing the asphalt material, revealing rheological mechanism, improving the road performance of the asphalt pavement and prolonging the service life of the asphalt pavement.

Description

A portable asphalt dynamic shear rheometer

Technical field

The invention relates to the technical field of asphalt measurement in highway engineering, and in particular to a portable asphalt dynamic shear rheometer.

Background technique

Materials are the foundation of transportation infrastructure and the forerunner of the development of transportation infrastructure. The full-process characterization of material properties (material research and development, production and construction) is the guarantee for building long-life transportation infrastructure. As one of the important materials in transportation infrastructure construction, asphalt is a typical rheological material. Its rheological properties are closely related to the cracking, rutting and fatigue of asphalt pavement, and have attracted much attention from road workers. The rheometer is an instrument that characterizes the rheology of asphalt. Currently, existing commercial rheometers are basically imported from abroad. The unit price is more than 400,000 yuan, the weight is more than 50kg, and the height is about 70cm. There are problems such as high price and inconvenience to carry. The above problems make production and construction units extremely short of rheometers. Their technical staff only use the penetration evaluation system to evaluate the asphalt performance and fail to evaluate the asphalt rheological properties, resulting in unreasonable evaluation and selection of high-quality asphalt road performance and resulting in actual The service life of asphalt pavement is far lower than the design life. Therefore, the development of a portable dynamic shear rheometer is of great significance for production and construction units to timely characterize the rheological properties of asphalt, improve the quality of road projects, and promote the construction of a powerful transportation country.

Contents of the invention

The purpose of the present invention is to solve the problems of existing commercial rheometers such as high price, inconvenience to carry and poor scene applicability, and to provide a portable asphalt dynamic shear rheometer.

The purpose of the present invention is achieved through the following technical solutions:

A portable asphalt dynamic shear rheometer, including a mechanical structure module and a drive acquisition module. The mechanical structure module includes an actuation module, a clamping module and a displacement adjustment module; the actuation module includes a grating encoder, a stepper motor, a torque sensor and a lower housing; the clamping module includes an upper sample clamp, a lower Clamp and temperature sensor; the displacement adjustment module includes a concentric adjustment mechanism, a sample thickness adjustment mechanism and a limit block; the drive acquisition module includes a closed-loop motor driver, a high-speed torque acquisition card and a PID temperature controller. The top of the frame is equipped with an encoder through a mounting cavity, the output shaft of the encoder is installed with a rotating spindle through bolts, and a stepper motor is set at the end of the output shaft; the output shaft of the stepper motor is installed through bolts There is a rotating spindle, and a torque sensor is set at the end of the output shaft; the closed-loop motor driver, high-speed torque acquisition card and PID temperature controller are integrated into a drive controller; the drive controller is electrically connected to the stepper motor and torque sensor The upper clamp of the sample is connected to the torque sensor; the lower clamp of the sample is integrated with the lower shell; the temperature sensor is fixed on the lower clamp; the concentric adjustment structure, the sample thickness adjustment mechanism and the limit block automatically It is connected with the lower shell through bolts from top to bottom.

Furthermore, the grating encoder, stepper motor and torque sensor are all hollow structures;

Further, the sample fixture includes parallel plates and vertebral plates.

Further, in order to accurately control the temperature of the sample, the temperature sensor is fixed in the lower clamp close to the sample;

Further, in order to accurately control all components of the equipment to be at the same horizontal position, the concentric adjustment mechanism is fixed on the lower housing to adjust the axis of the components up and down;

Furthermore, in order to accurately control the thickness of the sample, the gap adjustment mechanism is fixed on the concentric adjustment mechanism to adjust the thickness of the sample left and right.

Compared with the prior art, the present invention has the following beneficial effects:

The mechanical structural elements of the present invention all adopt hollow structures, and can be combined with an X-ray/neutron scattering spectrometer to build an asphalt rheo-AXS/ANS joint platform, with strong scene applicability.

The invention is small in size, easy to carry, and convenient for production and construction units to quickly evaluate the rheology of road materials.

The invention is of great significance for rapid evaluation and optimization of asphalt materials, revealing the rheological mechanism, improving the performance of asphalt pavement and extending the service life of asphalt pavement.

Description of the drawings

Figure 1 is a schematic diagram of the mechanical structure of a portable asphalt dynamic shear rheometer of the present invention.

Figure 2 is a plan view and a side view of a portable asphalt dynamic shear rheometer of the present invention.

Figure 3 is a schematic diagram of the connection of various components of a portable asphalt dynamic shear rheometer of the present invention.

Figure 4 is a schematic diagram of a portable asphalt dynamic shear rheometer fixture of the present invention.

Figure 5 is a schematic diagram of the driving principle of a portable asphalt dynamic shear rheometer of the present invention.

In Figure 1: 1. Grating encoder; 2. Stepper motor; 3. Torque sensor; 4. Upper sample clamp; 5. Lower sample clamp; 6. Temperature sensor; 7. Lower housing; 8. Concentric adjustment mechanism; 9. Sample thickness adjustment structure; 10. Limiting block.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings: This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation modes are given, but the protection scope of the present invention is not limited to the following embodiments.

As shown in Figures 1 to 5, a portable asphalt dynamic shear rheometer includes a mechanical structure module and a drive acquisition module.

The mechanical structure module includes an actuation module, a clamping module, and a displacement adjustment module. The overall mechanical structure diagram is shown in Figure 1, and the plan and side views are shown in Figure 2;

The actuation module includes a grating encoder 1, a stepper motor 2, a torque sensor 3 and a lower housing 7. The connection diagram of each component is shown in Figure 3;

The clamping module includes an upper sample clamp 4, a lower clamp 5 and a temperature sensor 6. The schematic diagram of the clamp is shown in Figure 4;

The displacement adjustment module includes a concentric adjustment mechanism 8, a sample thickness adjustment mechanism 9 and a limit block 10;

The drive acquisition module includes a closed-loop motor driver, a high-speed torque acquisition card and a PID temperature controller;

A grating encoder 1 is installed on the top of the frame through a mounting cavity, a rotating spindle is installed on the output shaft of the encoder 1 through bolts, and a stepper motor 2 is set at the end of the output shaft;

The output shaft of the stepper motor 2 is installed with a rotating spindle through bolts, and a torque sensor 3 is set at the end of the output shaft;

The closed-loop motor driver, high-speed torque acquisition card and PID temperature controller are integrated into the drive controller;

The drive controller is electrically connected to the stepper motor 2 and the torque sensor 3. The schematic diagram of the drive principle is shown in Figure 5;

The sample upper clamp 4 is connected to the torque sensor 3;

The sample lower clamp 5 and the lower shell 7 are integrated;

The temperature sensor 6 is fixed on the lower clamp 5 of the sample;

The concentric adjustment structure 8, sample thickness adjustment mechanism 9 and limit block 10 are connected to the lower housing 7 through bolts from top to bottom.

Among them, the grating encoder 1, stepper motor 2, and torque sensor 3 are all hollow structures;

Wherein, the sample fixture includes parallel plates and vertebral plates.

Among them, in order to accurately control the temperature of the sample, the temperature sensor 6 is fixed in the lower clamp 5 at a position close to the sample;

Among them, in order to accurately control all components of the equipment to be at the same horizontal position, the concentric adjustment mechanism 8 is fixed on the lower housing 7 to adjust the axis of the components up and down;

Among them, in order to accurately control the thickness of the sample, the sample thickness adjustment structure 9 is fixed on the concentric adjustment mechanism 8 to adjust the thickness of the sample left and right.

The above are only preferred specific implementations of the present invention. These specific implementations are all based on different implementations of the overall concept of the present invention, and the protection scope of the present invention is not limited thereto. Anyone familiar with the technical field Changes or substitutions that a skilled person can easily think of within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (3)

1. A portable asphalt dynamic shear rheometer, which is characterized in that it includes a mechanical structure module and a drive acquisition module; in: The mechanical structure module includes an actuation module, a clamping module, and a displacement adjustment module; The actuation module includes a grating encoder, a stepper motor, a torque sensor and a lower housing; The clamping module includes an upper sample clamp, a lower clamp and a temperature sensor; The displacement adjustment module includes a concentric adjustment mechanism, a sample thickness adjustment mechanism and a limit block; The drive acquisition module includes a closed-loop motor driver, a high-speed torque acquisition card and a PID temperature controller; An encoder is installed at the top of the frame through a mounting cavity, the output shaft of the encoder is installed with a rotating spindle through bolts, and a stepper motor is set at the end of the output shaft; The output shaft of the stepper motor is installed with a rotating spindle through bolts, and a torque sensor is set at the end of the output shaft; The closed-loop motor driver, high-speed torque acquisition card and PID temperature controller are integrated into the drive controller; The drive controller is electrically connected to the stepper motor and torque sensor; The sample upper clamp is connected to a torque sensor; The lower clamp of the sample is integrated with the lower shell; The temperature sensor is fixed on the lower clamp; The concentric adjustment structure, sample thickness adjustment mechanism and limit block are connected to the lower shell through bolts from top to bottom; The grating encoder, stepper motor, torque sensor and housing are all hollow structures, used to build an asphalt rheology-X-ray scattering/neutron scattering combined platform in combination with an X-ray/neutron scattering spectrometer; The concentric adjustment mechanism is fixed on the lower shell and adjusts the axis of the element up and down; In order to accurately control the thickness of the sample, the sample thickness adjustment mechanism is fixed on the concentric adjustment mechanism to adjust the thickness of the sample left and right. 2. The portable asphalt dynamic shear rheometer according to claim 1, characterized in that the sample fixture includes a parallel plate and a vertebral plate. 3. The portable asphalt dynamic shear rheometer according to claim 1, characterized in that, in order to accurately control the temperature of the sample, the temperature sensor is fixed in the lower clamp close to the sample.