Automatic Quantitative Packing Scale Common Fault Handling

0. Overview

The quantitative packing scale with compact structure, high precision, powerful function, simple operation, stable and reliable is playing an increasingly important role in the production of enterprises.Its performance directly affects the economic benefits of enterprises.Guizhou Chuanheng Chemical Co., Ltd. currently has 5 sets of automatic quantitative packing scales, which will seriously affect the production of the company if the maintenance and repair are not sufficient after the failure.In this context, the instrument maintenance personnel to automatic quantitative packing scale fault judgment and maintenance ability must reach a higher level.

1.Structure composition and working principle of quantitative packing scale

The company selects the double scale automatic quantitative packaging scale, its control system adopts GM8804CD packaging controller (hereinafter referred to as the controller) as the core component.The controller is a weighing control instrument specially developed for automatic quantitative packing scale with double scale increment method.The controller has the functions of automatic zero tracking, automatic drop correction, automatic feeding control, manual input millivolt number, multiple formulations, batch times setting, weighing results display, instrument fault self-diagnosis and so on. It has the advantages of fast packing speed and high measuring accuracy.This quantitative packing scale can be widely used in food, seed, feed, chemical industry and other industries that need quantitative packing equipment.

1.1 Composition and function

Double scale automatic quantitative packaging scale by the electrical control system and mechanical start command, large and small feeding solenoid valve power, cylinder action, large and small feeding silo door open, start feeding.When the material into the hopper reaches the large feeding amount set by the weighing controller (that is, the weighing value of the scale is greater than the target value of the scale - the large feeding amount), the large feeding solenoid valve is turned off, and the feed is converted into a small feeding process.As the material continues to enter the hopper, to reach the weighing controller set small feeding drop value (that is, the scale weighing value ≥ scale target value - small feeding drop value), small feeding solenoid valve off, small feeding process is over.As the aerial material falls into the hopper, the feeding process ends.The controller generates a weighing end signal.

1.2.2 Bagging and feeding process

Manually bagging and moving the bag clamp switch to clamp the bag.If at this time the controller produces the end of the weighing signal, the material door will open automatically, the material will be discharged down, and the material door will be closed after the feeding delay.After a period of delay, the bag clamp loosens, the bag falls down, and then the conveyor is sent to the manual sewing bag.

2.Common faults and their handling methods

In the maintenance work, whether the fault inspection method of packing scale is correct or not is very important to determine the fault location quickly and accurately and repair it.Here, the author introduces the reasons for the common malfunctions of packing scales and their treatment methods.

2.1 The packing scale is not accurate

1) the elastic deformation of the weighing sensor, poor linearity or the sensor is bad.Linearity can be determined by multiplying the standard weight to see whether the output display is proportional to the added weight. Calibrate or replace the sensor according to the judgment results.

2) the line connection of the weighing sensor is poor, causing the signal fluctuation of the weighing sensor, resulting in the instability of the weighing.Regularly check and clean up the line.

3) the feeding door is too open, the impact force is too strong, beyond the target value, the small feeding is too late to control.Can reduce the opening of the feed door, adjust it to the appropriate position.

4) the feed door is loose, small feeding control is not good, resulting in weighing fluctuations.The cleaning door can be checked regularly.

5) The setting of large feeding advance quantity is small, and small feeding does not work.The parameters of large feeding advance can be reset, and a range can be specified in the process of use.

6) the incoming material is uneven, and the drop value is not easy to control, resulting in more or less weighing time.The silo should be controlled for uniform feeding.

7) cylinder, solenoid valve slow action, resulting in the feed can not be quickly shut off, resulting in too much weighing.Cylinder and solenoid valve can be cleaned or replaced.

8) the air pipe of the hopper cylinder is pulled tight, resulting in the weighing fluctuation.The trachea can be grown and fixed.

2.2 The cylinder does not operate

If the cylinder does not act, it should first determine whether it is a control fault, a solenoid valve fault, or a cylinder fault.Check whether the solenoid valve has been executed, so as to judge whether the controller has an output command, if not, it can be determined to be the fault of the control end, check the controller.If the solenoid valve is executed, check whether the solenoid valve is charged, if not, it is judged to be a solenoid valve fault.Finally, press the manual button of the solenoid valve by hand to see if the cylinder can be pushed. If it cannot move, it is a mechanical card or air source fault.

The company cylinder does not act mainly in the solenoid valve failure, because of the water in the compressed air, impurities caused by the solenoid valve jam, finally in the main air source to increase the air filter after solving the solenoid valve jam phenomenon, so that the use cycle of the solenoid valve increase.

2.3 The bag holder does not move or cannot be closed

1) The bag clamp switch fails. If the switch cannot be connected or cannot be switched on after being connected, the bag clamp switch should be replaced.

2) When the solenoid valve fails, replace it.

3) cylinder failure, replace the cylinder.

2.4 Before the hopper discharge is finished, the bottom door will be closed in advance

1) there is material adhesion in the hopper, and the discharge is not smooth. Clean the hopper.

2) solenoid valve gas channeling fault, replace the solenoid valve.

3) cylinder failure, replace the cylinder.

4) The delay time set by the controller is short, so change the delay time.

2.5 The clip bag is not tight

1) If the air source pressure is insufficient, check whether the pressure of the main air source is insufficient. At the same time, check whether the trachea is broken. If the trachea is broken, the trachea should be replaced.

2) When the bag cylinder or solenoid valve fails, clean the cylinder or replace the cylinder and solenoid valve.

2.6 After the completion of weighing, the material in the weighing hopper is still increasing or decreasing

1) The feeding door and the discharging door can not be closed because the screw is loose or the material is lumped, which can be solved by tightening the screw or cleaning the lumped material.

2) the material door has mechanical friction, need to repair the material door.

3 conclusion

The operation quality of automatic quantitative packing scale is not only related to the quality of the product itself, but also has a great relationship with whether the maintenance personnel accurately judge the fault location and processing ability.Maintenance personnel can accurately and timely find and solve problems, which can effectively improve the production capacity and economic benefits of enterprises.

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