The weighing sensors are widely used in various fields

The weighing sensors are widely used in various fields

In the field of weighing sensor, there are significant differences in the main technical indicators, basic concept understanding and evaluation methods of the old and new national standards.

These differences are mainly manifested in the types of weighing sensors, such as S type, cantilever type, wheel type, plate ring type, membrane box type, bridge type and column type.

As the core passive element in the electronic technology, the weighing sensor and the resistance and inductor together to form the basis of the electronic circuit.

Among them, the capacitive sensor is particularly unique, which skillfully transforms the measured changes into capacitance changes, which is essentially a capacitor with variable parameters.

Characteristics of the weighing sensor:

Advantages: The weighing sensor is insensitive to the changes of the loading point, has excellent anti-bias load performance, excellent linear characteristics, easy installation, and high stability after fixation, and relatively low manufacturing cost.

Disadvantages: its center of gravity position is high, the overload capacity is relatively limited, especially for the large scale of the weighing sensor, to achieve a high accuracy level is challenging.

Performance characteristics of the weighing sensor:

With the continuous progress of the society and the continuous enhancement of national strength, new materials emerge in an endless stream, the performance of the original materials has been further improved, and the scope of application is expanding.

Therefore, the inspection of the material has also put forward more stringent requirements.

At present, the common weighing sensors on the market are mainly divided into two series and four types:

Hydraulic series: including manual hydraulic weighing sensor and electro-hydraulic servo hydraulic weighing sensor.

Electronic universal series: covering conventional electronic weighing sensor and high-performance electronic weighing sensor.

Performance and characteristics analysis:

Manual hydraulic weighing sensor: This type of sensor mainly relies on a simple high pressure oil source as the power source, which is controlled by the manual adjustment valve.

The loading process shall be completed manually and belongs to the open-loop control system.

Limited by the oil source flow rate and the main engine structure, the cylinder piston stroke of the manual hydraulic weighing sensor is usually short, and the test speed is relatively low.

Due to the price factor, the force sensor usually uses the pressure sensor (the pressure sensor may be used when large tonnage), so the accuracy and range are limited, the general accuracy is 1 or 2 levels, the range is generally 4%!

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In addition, affected by the friction of the cylinder, its tonnage is difficult to do very small, the domestic minimum is generally 5T.

However, due to its low price and large tonnage characteristics, it is still widely used in the finished product inspection and the single material index test.

Electro-hydraulic servo weighing sensor: this kind of sensor uses precision high pressure oil source as the power source, through the servo valve or proportional loop automatic control valve.

Its control performance is high, can realize the load, strain, displacement and other control modes.

The same as the manual hydraulic weighing sensor, the test speed is also low due to the limitation of the oil source flow rate.

But using the closed-loop automatic control, the system stiffness becomes the key to the normal operation of the whole system.

In order to reduce the influence of liquid on the stiffness of the whole machine, the travel of the electro-hydraulic servo tester is usually small.

At the same time, affected by the stiffness of the whole machine, the tonnage of the electro-hydraulic servo test machine is also large, basically more than one ton.