Truck scale sensor for detecting quantity of automobile tires

Abstract

The invention relates to a truck scale sensor for detecting the quantity of automobile tires. The sensor comprises a support shaft, a base, at least one returning spring and at least one sensitive element, wherein the support shaft can do finite movement in an axial direction; the base is used for installing the support shaft; the returning springs are used for providing restoring force for the support shaft; the sensitive elements are used for detecting the positional change of the support shaft and outputting a change signal; the support shaft is movably installed in the base; the sensitiveelements are installed on a side surface of the support shaft; in the absent of wheel pressing, the support shaft moves to an upper point under the action of the returning springs and then the sensitive elements output a state; and when a wheel presses, the support shaft moves to a lower point and then the sensitive elements output another state. By the sensor, the defects of high false rate and short service life of the traditional actually-used weighing sensor are overcome, and the defects expressed by an axel identification machine of several non-weighting sensors recorded in documents areovercome. Moreover, the sensor has the remarkable advantages of low requirement for processing accuracy, simplicity in assembly and strong output signals.

Description

technical field [0001] The invention relates to a sensor for detecting the number of tires or axles of passing vehicles in a road system, which belongs to the field of measurement. Background technique [0002] Highway governance overrun and weight-based tolling require accurate measurement of the number of tires or axles of vehicles. For a long time, it has been mainly used for weighing sensors, and some people have tried to use infrared sensors, but they have not been seen due to the diversity and randomness of on-site conditions. Used successfully. [0003] At present, a group of load cells arranged at a certain distance are used to measure the number of tires and axles. When a wheel presses over the sensor, the pressed sensor will output a voltage. Through amplification and comparison processing, it is determined whether there is wheel pressure. However, the number of sensors that are pressed can determine whether it is a single tire or a double tire. [0004] The adva...

AI Technical Summary

Problems solved by technology

Among them, CN200720190120.8 has solved the sealing relatively thoroughly, but the load-bearing and irregular deformation of the rubber body will make the sensitive element unable to be accurately detected, and it is also very easy to damage the sensitive element; the ejector pin of CN200520017319.1 and CN200320108298.5 work relative to the sealing ring For sliding, in actual use, it will fail early due to the action of sand particles in the gap. The guide shaft at the lower part of the ejector rod is very thin. If it is hit by a stone entrained by the wheel, it will be permanently damaged.

These kinds of non-load cell axle identifiers have not been applied in practice due to the above-mentioned defects.

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