Liquid material output method adopting metering pumps

Abstract

The invention provides a liquid material output method adopting metering pumps. The liquid material output method comprises the following steps that N metering pumps used for correspondingly conveyingN kinds of liquid materials are provided, wherein each metering pump comprises a cylinder body and a piston assembly, each cylinder body comprises a fixed cylinder and a cylinder body moving plate, and a cylinder body opening is formed in each fixed cylinder; each cylinder body moving plate is arranged at the corresponding cylinder body opening in a sliding mode, and a cylinder body space is defined by each cylinder body moving plate and the corresponding fixed cylinder; each piston assembly comprises an actuator plate and a piston telescopic part, each actuator plate is arranged on the corresponding fixed cylinder in a sliding mode, each piston telescopic part is connected to the corresponding actuator plate and is in sliding contact with the corresponding fixed cylinder and the corresponding cylinder body moving plate so as to form a closed space for accommodating the liquid material in the cylinder body space; the cross sectional area of the corresponding closed space is adjusted through the movement of the cylinder body moving plates and the stretching of the piston telescopic parts; and the actuator plates of the N metering pumps are driven to synchronously move, and the liquid feeding amount of each liquid material is the product of the cross sectional area of the corresponding closed space and the movement distance of the corresponding actuator plate. The liquid material output method can ensure that the mixed proportion of various liquid materials is stable.

Description

Technical field [0001] The invention relates to the technical field of liquid material output, in particular to a liquid material output method using a metering pump. Background technique [0002] In the existing PU (polyurethane) foamed parts manufacturing equipment, the metering pump used in the system is a key component, and the mixing ratio of the two materials is controlled by the metering pump of the respective system. The metering pump in the prior art usually adjusts the delivery volume by changing the stroke of the plug. Because the system pressure is unstable, and the control systems of the two metering pumps have to make the embolism movement speed of the two metering pumps inconsistent, during use, the stroke of the embolism will be affected by the outlet pressure reaction and the return difference of the mechanical mechanism, resulting in embolism movement. The phenomenon of pulsation means that the time is fast and the time is slow, which makes the liquid output un...

AI Technical Summary

Problems solved by technology

Due to the instability of the system pressure, and the respective control systems of the two metering pumps, the movement speed of the two metering pump plugs is inconsistent. During use, the stroke of the plug will be affected by the reaction of the outlet pressure and the return stroke difference of the mechanical mechanism, resulting in the movement of the plug. The jumping phenomenon is that it is fast and slow, which makes the liquid output unstable, resulting in an unstable mixing ratio of the two materials, or the asynchronous output of the materials leads to stratification, resulting in unqualified foamed parts.

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