System and method for automatically regulating clamping force of motor-driven injection molding machine

Abstract

The invention discloses a system for automatically regulating the clamping force of a motor-driven injection molding machine. The system is characterized in that four draw bars penetrate through a static template, a movable template and a rear template, and the static template is fixed on the draw bar; a five-point toggle mechanism is connected between the movable template and the rear template, and the crosshead thereof penetrates through the rear template and is sleeved outside a ball screw; the ball screw is driven by a spotting motor; the rear template is connected with the four draw bars through four regulating nuts; a bearing is arranged between each regulating nut and the rear template; the peripheries of the regulating nuts are provided with gear teeth; a rack wheel is arranged at the neutral position of the four regulating nuts and is meshed with the gear teeth of the four regulating nuts; the crosshead of the five-point toggle mechanism and the ball screw pass through the center of the rack wheel; the output gear of a mold-adjustment motor is meshed with the rack wheel; and the mold-adjustment motor is connected with an injection molding machine control system. The invention also aims at providing a method for automatically regulating the clamping force of a motor-driven injection molding machine. The invention has the advantages that the mold-adjustment accuracy is high.

Description

technical field [0001] The invention relates to the field of electric injection molding machines, in particular to an automatic adjustment system and adjustment method for the clamping force of an electric injection molding machine. Background technique [0002] The opening and closing of the electric injection molding machine uses a servo motor to drive the movement of the crosshead through a ball screw. The crosshead cooperates with the toggle mechanism to convert the rotational movement into a linear movement in the direction of mold opening and closing. In the stage of injection and holding pressure, the pressure generated by the material in the mold cavity is called the expansion force. In order to prevent the mold from being separated by the expansion force, the machine must exert sufficient clamping force on the mold. If the clamping force is insufficient, the mold will be separated from the seam and overflow will occur, but if it is too large, the mold will be deform...

AI Technical Summary

Problems solved by technology

[0004] At present, the mold adjustment mechanism of the hydraulic injection molding machine, the hydraulic motor control mold adjustment sensitivity is low, the mold adjustment method is complicated, the mold adjustment accuracy is low, and the accurate mold clamping force cannot be guaranteed after the mold adjustment.

In addition, the generated noise is high and the life of the ball screw is short

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