High-precision asphalt penetration tester

Abstract

The utility model discloses a high-precision asphalt penetration tester. The tester comprises a rack, a measuring rod and probe module, an up-and-down walking module, a sample placing module and a control module, wherein the measuring rod and probe module comprises a connecting seat, a measuring rod and probe bracket, a measuring rod and a probe; the measuring rod is of a columnar structure and comprises a balance weight part, a main body part and a clamping part from top to bottom. An air bearing sleeve structure is fixedly arranged on the measuring rod probe support, a measuring rod hole isformed in the center of the air bearing sleeve structure, and an air cylinder cavity is formed in the lower middle position of the bearing sleeve structure. A load sensor is arranged at the lower endof the measuring rod; and the sample placing module is provided with an electronic refrigeration sheet. According to the tester, an air bearing structure and a pneumatic clamping structure are adoptedto reduce contact friction, a force measuring sensor is adopted to realize automatic needle alignment, a laser displacement sensor is adopted to realize non-contact measurement, and an electronic refrigeration sheet is adopted to realize accurate constant temperature, so that the asphalt penetration index performance detection precision is high, the operation is convenient, and the automation degree is high.

Description

technical field [0001] The invention relates to asphalt penetration performance testing equipment, in particular to a device that uses an air bearing structure and a pneumatic clamping structure to reduce contact friction, uses a load cell to realize automatic needle alignment, uses a laser displacement sensor to realize non-contact measurement, and uses an electronic The asphalt penetration tester is an asphalt penetration tester that realizes precise and constant temperature of the refrigeration plate and makes the detection accuracy of the asphalt penetration index performance high. Background technique [0002] Asphalt penetration is one of the main quality indicators of asphalt. It is an index that indicates the degree of softness and consistency of asphalt, the ability to resist shear damage, and reflects the relative viscosity of asphalt under certain conditions. [0003] At present, there are three representative evaluation systems for road asphalt in the world, name...

AI Technical Summary

Problems solved by technology

[0007] 1. The traditional equipment adopts manual method for needle zero adjustment, slowly put down the connecting rod of the measuring needle, and observe with a reflector or light radiation at an appropriate position, so that the needle tip is just in contact with the surface of the asphalt sample, and then reset the displacement indicator to zero , the measurement accuracy of this method is low, the human operation error is large, and the manual interpretation is not accurate;

[0008] 2. The loading link and displacement sensor of traditional equipment are all contact mechanical connections. During the test, the loading link and the weight are pressed down by their own weight. The loading link is supported by the guide sleeve, and the link and guide sleeve There is friction between them, which directly affects the accuracy of the loaded load. At the same time, there is no load monitoring and reading device, so it is impossible to guarantee whether the loaded load meets the requirements;

[0009] 3. Before the test, the loading link is pressed by a mechanical spring lock block. During the test, the electromagnet connected to the lock block is used to drag the lock block to move, and the load link and its counterweight are released to apply force to the probe. Load, due to the use of mechanical locking devices, will also affect the accuracy of load and displacement;

[0010] 4. Asphalt is very sensitive to temperature. Traditional equipment generally uses artificially adjusted water temperature or an external constant temperature water bath to keep the water constant and circulates it into the sample water tank through a water pump. As the asphalt penetration test usually adopts 5°C, 15°C , 25°C, and 30°C for testing, the ambient temperature of the laboratory is basically around 22°C, and simple temperature adjustment cannot guarantee that the temperature of the sample water tank is controlled within the range of ±0.1°C

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