The spray gun liquid Filling machine is manufactured using a PLC programmable controller. It collects and processes weight data through communication, and sends a signal to the descaling device to enable the instrument to perform descaling. In the quantitative filling mode, the PLC acts as the main controller and receives data from the weighing instrument, processes the data, and then issues a series of signals for the filling machine actions to complete the quantitative filling. After the filling is completed, a professional mechanical hand will accurately remove each packaging bucket, precisely transport the bucket to the designated position through the power track, and perform real-time detection and control of the full bucket, congestion, lid lowering, opening/closing of the filling valve, etc. The Filling system uses PLC signals to drive the motor and other transmission mechanisms to move the mechanical hand, and at the same time drives the motor's built-in encoder to provide position pulse numbers to the driver. The driver compares the two pulses and determines the deviation, performs calculations according to a certain control law, and obtains the correction signal as the setpoint for the speed controller in the servo driver, which is then amplified and powered to make the grasping mechanical hand move in the direction to eliminate the deviation, thereby achieving the stacking and positioning of the mechanical hand.

The weighing and filling machine integrates machinery, optics, electricity, and gas. It is a computer-programmed control of an integrated mechanical-electrical product. It adopts the weighing measurement principle and uses a high-precision weight detection method. It automatically loads the bucket, automatically descales, automatically lowers, automatically fills, automatically lifts, and automatically outputs. The filling system transports the empty bucket to the filling position, aligns the bucket mouth and the spray gun mouth, presses the start button, and the spray gun moves into the bucket under the drive of the cylinder; when the detection of the spray gun is in place, the bottom valve opens, and the nitrogen filling valve starts to fill the dry nitrogen through the filling port into the bucket, replacing the air inside the bucket with nitrogen, and accelerating the drying of the inner wall of the bucket to ensure the safety of filling. During nitrogen filling, it is necessary to ensure that all the air in the container is completely replaced. The nitrogen filling quantity can be adjusted by the weighing instrument according to the quantitative time. After nitrogen filling is completed, the nitrogen filling valve is closed, and the control instrument automatically removes the descaled weight of the empty bucket from the scale, and then both the fast and slow feeding ball valves are opened simultaneously; first, the fast feeding is carried out, the spray gun stays at the lowest position for a period of time before starting to rise below the liquid level for filling, then it stays at the middle position as the liquid level rises, stops at the bucket mouth, and then slows down the feeding; when the filling volume reaches the preset advance volume, the ball valve and bottom valve are closed; the spray gun rises out of the bucket; the vacuum suction device is activated to ensure no residual liquid droplets leak. All the sealing parts of the pipeline are sealed with polytetrafluoroethylene material to meet the no-leakage requirement.

The automatic filling machine transmits the weight of the material to be weighed by the scale body to the weighing module. The weighing module amplifies, filters, and converts the output millivolt signal into an analog signal, which is then sent to the microcomputer for digital processing. The weighing instrument displays and prints the weight, and at the same time, it controls the scale body. Thus, a closed-loop filling system is formed to achieve a complete measurement control process. The Liquid filling machine automatically divides large quantities of bulk materials into small portions of equal weight loads through automatic weighing control according to the pre-designed weighing program and quantitative values, using PLC as the control core, consisting of the filling system and the video monitoring system. To achieve accurate and timely control of each product transportation process, traditional control methods and modern control methods are combined to jointly complete the control of the filling system. For the constant feeding part, the traditional PID control method is used, and for the control of the filling slurry concentration, the calculation is carried out during the filling process and compared with the set value to achieve control. The flexibility of modern controllers in control is fully utilized to jointly complete the regulation and control of the filling system and the monitoring of level, weighing, flow rate, and real-time monitoring. The weighing filling machine is composed of a filling piston valve, an Electronic scale and an air valve (electromagnetic valve). The filling piston valve usually fills the weighing bucket in a coarse and fine two-stage manner. After the weighing bucket has weighed the specified weight of the material, it discharges the material by opening the bottom door of the filling piston valve. The signals for coarse filling, fine filling and opening the bottom door for discharging are all controlled by the weighing controller through pneumatic electromagnetic valves. Under control, the filling machine fills the coarse material at a normal speed. The material in the filling piston valve enters the weighing for measurement. The weighing controller collects the weight data. When the fine filling set value is reached, the filling machine changes to a slow speed operation, and at the same time, the pneumatic filling gate is lowered. The material layer becomes thinner, reducing the flow rate and reducing the impact of the material on the weighing bucket, allowing the weighing to be almost carried out statically. When the preset set value is reached, the filling machine stops running. The filling piston valve controlled by pneumatic control drops, the material in the filling machine is retained in the bucket, the weighing bucket starts to weigh, and then the pneumatic discharge gate cylinder opens the discharge gate, discharging the material. After the discharge is completed, the discharge gate is automatically closed, entering the next weighing process, repeating the above process.

The automatic filling machine is suitable for the material feeding and Weighing system of bulk materials. It is usually compensated by filling batches. The common process components of the filling system include a storage bin for bulk materials, a gear pump for filling, a filling piston valve for filling the weighed material, a weighing bucket for discharging the material, an air gate for releasing the material to the container or weighing bucket, and a level sensor or level switch for the storage bin. Filling is achieved through the drive of a frequency converter or a double-speed motor for rapid weighing and slow weighing. The weighing bucket has a weighing module and a weighing instrument for feeding back the actual weighed weight to the PLC. The basic process of the machine is to set the weighing set value directly by the operator on the HMI screen or calculate automatically by the computer program, then start the filling machine. The filling machine first vibrates rapidly and discharges quickly. When the actual weighing value reaches a certain value, the filling machine changes from rapid filling to slow filling and slow discharge. When the actual weighing value reaches another certain value, the filling stops. At this time, due to the closing piston valve of the weighing filling machine, there will still be a part of the material falling down before it stops completely. This part requires a certain advance amount to be set. When it is completely stationary, the entire weighing process is completed.