Double-cylinder metering plunger pump and metering method thereof

Abstract

The invention discloses a double-cylinder metering plunger pump and a metering method thereof. The pump comprises a motor, a pump head, ball screws, a drive gear, inductive switches and a base plate, wherein the motor is connected with the drive gear; one side of each of the two ball screws is fixed on a pump head fixing plate of the base plate and the other sides of the two ball screws are connected with the drive gear; a plunger rod is arranged on each of the ball screws; support rods are arranged between front fixing plates of the ball screws and the pump head fixing plate; the inductive switches are respectively arranged at the two ends of one of the support rods; four glue inlet / outlet through holes are formed on the pump head; and one end of each of the through holes is connected with the outside and the other end of each of the through holes are in sealing connection with a plunger rod. In the method, after signals are sensed by the inductive switches, glue inlet / outlet directions are changed by changing the rotation direction of the motor and the direction of a reversing valve on the pump head so as to keep one of two glue inlets / outlets in a glue inlet state and the other one of the two glue inlets / outlets in a glue outlet state. The double-cylinder metering plunger pump is high in control accuracy, glue is stably fed and discharged, and continuous glue outlet is realized.

Description

technical field [0001] The invention relates to the field of point and glue filling equipment design, in particular to a double-cylinder metering plunger pump and a metering method thereof. Background technique [0002] In the existing technology, there are the following glue supply methods for pointing and pouring glue: (1) a small amount of glue is released, the glue is directly pressed by air pressure, and the amount and pressure of glue is controlled by the air pressure; (2) the gear The pump controls the glue output, relying on two or more gears sealed in a housing, the volume change of the working space generated during the mutual meshing process to deliver the liquid pump, by controlling the speed and number of turns of the gear pump internal gear Control the glue output and pressure; (3) The screw pump controls the glue output, and realizes the control of the glue through the rotor pitch and speed in the pump body. There are several defects in the above several tech...

AI Technical Summary

Problems solved by technology

There are several defects in the above several technologies: (1) Air pressure glue supply is greatly affected by the stability of air pressure, and it is very easy to affect the amount of glue output due to changes in air pressure, and it also affects the accuracy and consistency of glue output. Difficult to control; (2) The pressure at the discharge port of the gear pump depends entirely on the resistance of the externally connected glue delivery system, which is inversely proportional to the glue output. There will be different backflow due to the size of the resistance, and it is easy to cause wear to the gear when the liquid has particles, and it cannot be used in any situation, and it is difficult to accurately control the accuracy and consistency of the glue; (3) the screw Because the stator of the pump is made of rubber, it is not wear-resistant and needs to be replaced regularly, and the follow-up service cost will increase. The screw pump will produce different return flow due to the change of the outlet pressure, and it is difficult to accurately control the accuracy and consistency of the glue.

(4) The current gluing methods are intermittent gluing, that is, the glue is injected from one or one glue inlet and then the glue is released outward under the action of pressure, and the glue cannot be continuously discharged.

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