Automatic quantitative packaging scale applies to:
Food (corn, sorghum, soybeans, rice, buckwheat, rice, millet, wheat, etc.)
Fertilizers (organic fertilizer, compound fertilizer, ammonium phosphate, large-particle urea, porous nitramine, heavy calcium, BB fertilizer, phosphate fertilizer, potash fertilizer, various mixed fertilizers, etc.)
Chemicals (applicable to PVC, PE, PP, ABS, polyethylene, polypropylene, sodium chlorite, etc.)
Quantitative packing scale consists of weighing unit, trolley, sewing package conveying device, pneumatic system, dust removal system, and quantitative packaging control instrument. The key component that affects the speed and accuracy of packaging is the weighing cell.
It includes storage bins, gates, cutting devices, scale bodies, bagging devices, brackets, and electrical control devices. The storage silo is a buffer silo for material storage and provides a nearly uniform material flow;
The gate is located at the bottom of the storage bin. When the equipment is overhauled or fails, it is used to block the material in the storage bin. The cutting device is composed of a cutting hopper, a cutting door, pneumatic components, a replenishment valve, etc. during the weighing process. In the fast,
For slow two-stage feeding, the material flow of fast and slow feeding can be individually adjusted to ensure that the quantitative packing scale meets the accuracy requirements and speed requirements for metering; the function of the compensating valve is to balance the air pressure in the system during weighing. difference;
The scale body is mainly composed of a weighing hopper, a load-bearing bracket and a load cell, and the weight is converted to the electrical signal and transmitted to the control unit. The bag clamping device is mainly composed of a bag clamping mechanism, pneumatic components, etc., and functions as a clamping packaging bag.
Let the weighed materials all fall into the packaging bag; the electrical control device is composed of a weighing display controller, electrical components, and a control cabinet. The role is to control the system work and make the entire system work in order according to a preset procedure.
Weighing debugging method Edit Check the sensor wiring is correct, open the control cabinet power and warm up for 15 minutes before debugging. In this paper, the technical requirements for the maximum capacity of 100kg, the division value of 0.2kg, the quantitative value of 90kg, and the accuracy level of satisfying X(0.2) are taken as examples.
(1) Partial Load Adjustment The 10kg weight is placed on the two weighting points of the weighing bucket. When the weighing indicator shows “positive differenceâ€, the sensor output should be adjusted to decrease direction; when the indicator shows “negative differenceâ€,
The sensor output should be adjusted to increase direction. For example, when the output of the L/C-1 sensor is reduced, a set of trimming resistors (original value 10 ohms) related to L/C-1 will be rotated with the same amount of rotation.
Turns (clockwise) the resistance value decreases, the displayed value increases (recorded as "plus");
The counterclockwise resistance increases and the displayed value decreases (denoted as "minus").
Note: When rotating the trimmer resistor, if the rotation of each group is inconsistent, the adjustment becomes difficult. Therefore, the amount of rotation of each set of trimmer resistance of the sensor should be as uniform as possible during adjustment.
The absolute value of each bearing error is not more than 10g as qualified.
(2) Weighing adjustment Weighing adjustments are performed in accordance with the procedures for the calibration of the weighing display controller manual. From the zero point to the maximum point, the weight is incremented in the order of 0kg, 40kg, 70kg, 90kg, and 100kg.
The errors are not greater than 10g, 20g, 35g, 45g, and 50g respectively; the weights are deducted from the maximum value to the zero point in the order of 100kg, 90kg, 70kg, 40kg, and 0kg respectively, and the error is not greater than the respective tolerance;
Repeatability tests were performed at 40kg and 100kg points, and each weighing point was performed 3 times. Each error was not greater than the respective tolerance.
(3) Parameter setting There are many parameters that must be set in the quantitative packaging scale. The following uses common key parameters as an example to introduce the following:
a, Weighing display controller quantitative value can be set to quantitative target value, such as 90kg.
b, quickly increase the amount of advance, slow increase in advance.
When the weight> (set value) - (fast increase in advance), stop fast increase, turn slow increase;
When the weight> (setting) - (slow advance), stop feeding.
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