Balances have a narrow sense and a broad sense. The balance in the narrow sense refers to the double-disk equal-arm mechanical balance. It is a weighing instrument that uses the equal-arm lever balance principle to compare the measured object with the corresponding weight to determine the quality of the measured object. The generalized balance includes three types: double-disc equal-arm mechanical balance, single-disc unequal-arm mechanical balance, and electronic balance. The mechanical balance of double-disc and other arms is generally divided into three types according to the structure: ordinary sign balance, differential sign balance and shelf balance. It can also be divided into 4 types: verification balance, analytical balance, precision balance and common balance. The verification balance is a balance specially used by the measurement department, the commodity inspection department or other relevant departments or factories to check or calibrate the weight. Analytical balances are high-accuracy balances used for chemical analysis and accurate measurement of substances. In most cases, the minimum division value of this type of balance is less than 10-5 of the maximum weighing. Analytical balances can be divided into constant balances (weighing and minimum division values ​​are 100 ～ 200g and 0.01 ～ 1mg), semi-micro balances (30 ～ 100g and 1 ～ 10g), and micro balances according to the measurement range and the minimum division value. 3 ~ 30g and 0.1 ~ 1g) and ultra-micro balance (3 ~ 5g and below 0.1g). Precision balances are widely used in the precise measurement of various substances, and the minimum division value is usually 10-5 to 10-4 of the maximum weighing. The ordinary balance is used as a general measure of matter. The minimum division value is equal to or greater than 10-4 of the maximum weighing.
The composition of the balance:
Ordinary sign balances are mainly composed of uprights, beams, hanging systems, bases and braking devices.
The upright is vertically fixed on the base to support the beam. The lower part of the column is equipped with an index plate, and the top is equipped with a bracket to support the beam when the balance is not working. A middle knife is installed in the middle of the beam. When the balance is working, the middle knife rests on the knife bearing connected to the top of the lifting rod as a fulcrum. There are two side knives on both sides of the middle knife, which are used as key points and force points, respectively, to play the role of bearing and transmitting loads. The bottom surface of the lower beam of the middle knife is provided with a pointer, and a gravity center mound that can be moved up and down to adjust the position of the center of gravity of the beam is fixed on the pointer, and it plays a role in adjusting the sensitivity of the balance. An index scale is engraved on the top of the beam, and there is a moving code on the scale. There are also balance nuts at both ends of the crossbeam which can adjust the balance position of the balance without load. The hanging system includes small rings, hanging rack and weighing pan. The hanging plate rack is hung on the small ring hook, and the two side knives bear the weight of the weighing pan weight and the weighing object through the small ring respectively. The base is equipped with two screw adjustment feet to adjust the balance level, and a level is also placed on the base to display the balance level. Adjusting the level is to avoid the weighing error caused by the balance not being level. The braking device is mainly composed of a switch knob, a switch shaft and an eccentric cam (or connecting rod). Turn the knob to deflect the cam (or eccentric connecting rod) to a certain angle to move the lifting rod in the column up and down, and lift or drop the beam through the middle knife bearing to open or close the balance.
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Corn machine according to the working mode can be divided into: automatic Eyeleting Machine, semi automatic Eyelet Machine, manual corn machine etc.;
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