What are the factors that affect the accuracy of weighing machines?
Weighing machine refers to the supporting use of modern electronic technologies such as program control, group control, telex printing records, screen display, etc., which will make the weighing equipment fully functional and more efficient. The weighing machine equipment is mainly composed of three parts: load-bearing system (such as weighing pan, scale body), force transmission system (such as lever force transmission system, sensor) and indication system (such as dial, electronic display instrument). So what are the factors that affect the accuracy of the weighing machine? The following editor will take you to understand. (1) Intrinsic factor of the item to be tested 1. The characteristics of the item to be tested include liquid, solid and powder. When a liquid item enters the weighing platform, since the conveyor belt of the weighing platform is moving, the shaking of the liquid inside will cause the change of the center of gravity of the item; when the solid object enters the weighing platform, the vibration generated by the object is large and lasts for a long time, and the system should be activated. Secondary filtering is used to resist vibration; when the powder item enters the weighing platform, the powder in the package may also flow, which will also cause the change of the center of gravity of the item. 2. The packaging of the tested item includes bags, cans and bottles. The size of the weight tolerance between the same packaging, the level of the bottom of cans and bottles, the diameter of the bottom, and the size of the height will affect the vibration generated when the measured item enters the weighing platform. 3. The material of the object to be tested, transparent objects and reflective objects, will affect the induction of the photoelectric switch; but we can effectively avoid this trouble by using the non-photoelectric weight recognition mode to check the weight. 4. The weight of the item to be tested, the heavier the item, the lower the accuracy. 5. The speed of the item to be tested, the faster the belt speed, the shorter the reading time of the system, the greater the impact on the accuracy; the number of items detected per minute will also affect the accuracy. 6. The shape of the object to be tested, the uneven bottom surface of the special-shaped object, and the vibration when entering the weighing platform has a great impact on the accuracy. (2) Use environmental factors 1. The temperature and humidity of the use environment; 2. The vibration and air flow of the ground, near the machine with large vibration, and the air flow port of the fan and the air conditioner, it is not suitable to install a checkweigher machine; 3. Static electricity and electromagnetic interference , the equipment should be grounded, and it should be separated from the high-power equipment and power supply system; 4. Protective measures should be taken in places with large dust and corrosive liquids. (3) Human factors 1. Improper parameter setting during use; 2. The distance between the speed-up section, weighing section and rejection section of the machine is too large or too small; 3. The weighing platform is not level; 4. The conveyor belt is too loose or too tight ; 5. The motor wire and sensor wire are not tied properly; 6. The sensor is overloaded and damaged; 7. The reflector of the photoelectric switch is not cleaned in time.
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