A filling machine and a method for protecting the last knuckle heater of the filling machine

Abstract

The invention relates to a filling machine and a last bevel heater protecting method thereof. The filling machine comprises a PLC, an electromagnetic valve, a last bevel heater, a temperature sensor, a solid-state relay and a normally-open pressure switch; the electromagnetic valve is used for controlling compressed air to be conveyed to the last bevel heater; the temperature sensor is used for detecting temperature of the last bevel heater; the PLC is used for outputting a work voltage according to conditions of the temperature detected by the temperature sensor; the normally-open pressure switch is used for being switched off according to increasing conditions of the compressed air released by the electromagnetic valve, and the work voltage output by the PLC is transmitted to the relay; the relay is used for controlling the last bevel heater to work according to the work voltage output by the PLC; the last bevel heater is used for heating the compressed air by means of the work voltage output by the PLC and spraying the compressed air through a lug wing seal nozzle for work.

Description

technical field [0001] The invention relates to the field of product packaging material sealing, in particular to a filling machine and a method for protecting a heater at the last knuckle of the filling machine. Background technique [0002] At present, the last knuckle heater of the filling machine used in China is powered by an AC contactor when it is working, and the PLC is intermittently connected to the solid-state relay that controls the last knuckle heater according to the temperature sensor detection signal, so that the last knuckle heater reaches the set temperature , the compressed air with a pressure of 1-2 bar is heated when it enters the final knuckle heater through the solenoid valve, and reaches the sealing nozzle of the ear wing, heating the top and bottom corners of the product packaging material PE. [0003] like figure 1 Shown is the control circuit diagram of the last knuckle unit in the prior art filling machine. like figure 2 As shown, it is the co...

AI Technical Summary

Problems solved by technology

During the heating process of the filling machine, when the filling machine performs the temperature-raising steps of the top and bottom corners, if the function of the pressure regulating valve and the solenoid valve fail, the pressure of the compressed air reaching the last knuckle heater is zero, resulting in the heating of the last knuckle device burned instantly

[0004] In the production process of the filling machine, if the top corner or the bottom corner is badly pasted, sometimes it is necessary to adjust the compressed air pressure reaching the final corner heater. If the pressure regulating valve fails during the pressure adjustment process, it will lead to the final The compressed air pressure of the knuckle heater changes, and the compressed air pressure will decrease below a certain value, which will cause the knuckle heater to burn out instantly

[0005] In the production process of the filling machine, if the top corner or the bottom corner is badly pasted, it is sometimes necessary to repair or replace the parts in the last corner heater unit. During the repair or replacement process, the pressure regulating valve needs to be closed before repair or replacement. Replacement, after the repair or replacement process is over, it sometimes happens that the pressure regulating valve is not opened due to human error

When the machine starts to heat up, the pressure of the compressed air reaching the last knuckle heater is zero due to the closing of the pressure regulating valve, causing the last knuckle heater to burn out instantly

[0006] The above-mentioned events that lead to the burning of the last knuckle heater have a high probability of occurrence, which makes the operation rate of the filling machine equipment low and brings economic losses

However, there are no preventive measures to protect the last knuckle heater of the filling machine. Therefore, it is urgent to solve the problem of how to reduce the probability of the last knuckle heater of the filling machine being burned

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