Explosion proof electronic forklift scale

Explosion proof electronic forklift scale

Summary of errors in car scales/scales: Methods to reduce errors: 1. Four corner offset load error. The offset load test requires that the position of the measured object on the weighing platform should not cause changes in the weighing measurement results after the electronic scale is loaded. Therefore, the four corner bias error comes from the sensitivity of the weighing sensor. Due to the differences in key materials such as elastomers and resistance strain gauges in electronic weighing sensors, as well as incomplete manufacturing processes, the sensitivity of each weighing sensor varies, resulting in the same excitation voltage and different signal outputs from each weighing sensor, leading to corner bias errors. In order to reduce the bias load error of the four corners, electronic weighing scales are equipped with potentiometers connected to each sensor branch. By adjusting the resistance value and utilizing the different voltage divisions of different resistors, the signal output of each branch can be balanced.

2、 The linear variation, zero drift, and rubbing of the weighing table caused by the weighing error sensor are all direct causes of weighing errors. The sensor measures linear changes in weighing. Due to the effects of temperature difference, impact force, floating dust, etc., the load borne by the sensor is not linearly related to its corresponding output voltage, resulting in significant changes in the weighing linearity of the electronic weighing scale sensor. Sometimes there may be significant errors in some weighing points. Linear calibration of the weighing system, i.e. segmented calibration of electronic weighing scales, can greatly reduce the relative error of the weighing process. Zero drift. The electronic weighing scale is affected by various sizes and repeated reciprocating impact loads during use, and the force situation of the sensor is very complex, which ultimately leads to changes in the contact points of the sensor, causing changes in the original state of the calibration time, resulting in zero drift and errors.

3、 Discrimination error refers to the ability of electronic weighing scales to respond to small changes in load. The purpose of discrimination testing is to verify the connection and friction of the scale structure. Therefore, friction and stress in mechanical connections are the main sources of discrimination error. In addition, because the discriminative power targets small changes, the resolution of weighing sensors and weighing instruments also has a significant impact on the discriminative error.

4、 Repetitive error refers to the difference between the output readings of a weighing sensor obtained from consecutive process tests under the same load and environmental conditions. It is caused by some relatively fixed factors, in addition to the repeatability errors caused by changes in environmental conditions such as temperature, humidity, wind force, and gravity field during weighing measurement, mainly including the lateral force of electronic weighing scale sensors and the repeatability errors caused by sensor conditions not being met. Due to the limitations of the on-site environment, the repeated errors caused by the lateral force of the electronic weighing scale sensor can easily cause the load receiver to shift up and down, resulting in the weighing platform not being perpendicular to the force acting on the weighing sensor. The lateral force exerted on the sensor is caused by design and manufacturing errors in the force transmission mechanism of the scale body, which are specifically reflected in the repeatability errors in the horizontal alignment of the upper and lower mounting surfaces of each sensor, the overall stiffness of the scale body, and related local stiffness. The repeatability error caused by angle difference in electronic weighing scales is transmitted to the weighing display instrument through the junction box. If some parameters of the sensor are not correct or the potentiometer in the junction box is not balanced, it will cause the angle difference of the electronic weighing scale. At this time, the weight will produce repeatability error at different positions on the weighing platform.

Explosion proof electronic forklift scale

5、 The inaccuracy of electronic weighing scales caused by gravitational acceleration is not only related to the aforementioned errors, but also affects the accuracy of measurements. According to the principles of mechanics, weighing can be divided into dynamic effect weighing using force and static effect weighing using force. The processing method for the impact of changes in gravitational acceleration on weighing results: ① Use the electronic weighing instrument itself to design software for gravity compensation. For example, the ACS series electronic pricing scale produced by a weighing instrument factory can directly input the gravitational acceleration of the place of use, which is automatically processed by a microcontroller for remote calibration. ② By using the electronic scale itself to set up a set of binary switches, the amplification factor can be changed by changing the state of the switches to correct errors caused by changes in gravitational acceleration, or it can be adjusted using a potentiometer. ③ The manufacturer can convert based on the difference in gravitational acceleration between the local area and the location where the electronic weighing scale is used.

6、 Methods to reduce errors: (1) Ensuring the technical indicators of electronic weighing scale sensors. The guarantee of electronic weighing scale sensor technical indicators is achieved by meeting various indicators. Choosing sensors with indicators that meet technical requirements is the key to ensuring the quality of electronic weighing scales, and we require all technical indicators to meet precision requirements. The main sensor indicators include linearity, creep, no-load temperature coefficient, sensitivity coefficient, etc. We require that each batch of sensors undergo sampling inspection and high and low temperature testing in accordance with national standards before being put into use. Only electronic weighing scales that have passed quality inspection can be put into use, and those that have not passed quality inspection can only be put into use after improvement.