SU608658A1 - Mould-closing mechanism for plastic moulding machine - Google Patents

Description

one

The invention relates to the field of mechanical engineering and can be used on machines, processing, their thermoplastics and thermoset plastics by the method of injection molding, as well as as a press.

A known mechanism for locking molds of an injection molding machine for plastics, containing, interconnected, front and rear fixed plates, a movable plate mounted on the columns, embedded in the rear

fixed plate hydraulic cylinder POWER

lock with a hollow plunger, hydraulic cylinders for accelerated movement of the movable plate, the supporting element, the locking element and the adjusting plate located between the movable and rear end plates.

However, such a mechanism has increased dimensions due to the presence of an adjustment plate.

The prototype (of the invention is a mechanism for locking the molds of a plastic injection molding machine, containing column-connected front and rear non-stemming plates, a movable plate mounted on the columns, built into the rear non-base plate hydraulic cylinder of a power lock with a hollow shear, hydraulic cylinders for accelerated movement of the submount plate, support rods and movable locking element 2.

However, this mechanism has several disadvantages as well. Namely, the reference pads are installed on the idil plate, therefore, the distance increases to the working pressure receptive pressure of the piston end of the power hydraulic cylinder and the mold, which entails an increase in the length and metal intensity of the locking mechanism; The installation of a pidrocyliidr of accelerated movement within the piston of a power cylinder worsens the conditions for the manufacture and repair of the locking mechanism; the transmission of force is locked from the piston to the support sterling n m by means of a locking element in the form of several gaskets set in motion by several hydraulic cylinders, which reduces the reliability and speed of the locking mechanism.

In order to reduce the metal consumption, the laboriousness of the manufacture of the locking mechanism and the expansion of its technological capabilities, the proposed mechanism is equipped with

Claims (2)

placed behind the rear fixed plate, a crossbeam with a drive for moving the hollow plunger when opening the forms, on which the hydraulic cylinders of the accelerated and relocated movable plate are mounted, while the supporting rods are mounted on the inner end of the new plunger, and the locking element is made in the form of a ring with openings for the passage of the supporting rod mounted pivotally on a movable plate, also provided with openings for the passage of the support rods. At the same time, the ring rotation drive is made in the form of a plunger hydrocylinder and an elastic element connected by a two-arm lever e with a rocker stone mounted on the ring end face. FIG. 1 shows the proposed mechanism of locking, a general view in section; in fig. 2 is a section A-A in FIG. 1. The locking mechanism of the injection molding machine is shown in a vertical position mounted on a pedestal L. It contains a front fixed plate 2, a rear fixed plate that is simultaneously a plunger hydraulic cylinder 3 of the power lock movable plate 4 connected by columns 5. Hydraulic cylinders serve for accelerated movement of plate 4 6, for its power lock, a hydraulic cylinder 3 with a hollow plunger 7, and with which supporting rods o and locking element in the form of a rotary ring 9 with openings 10 for passage of the supporting rods 8 are fixed; Newly mounted on the movable plate 4, also made with holes 11 for the passage of the support rods 8. To move the hollow plunger 7 when opening the forms (not shown), are plungers 12 connected to the hollow plunger 7 and hydraulic cylinders with a traverse 13. For moving the rotary ring 9 serves as a plunger hydraulic cylinder 14, an elastic element in the form of a spring 15, a double-arm lever 16, an axis 17, a rocker stone 18 and a finger 19. The hydraulic cylinders 6 of accelerated movement have the pistons 20 and stops 21. The locking mechanism works as follows. The working fluid, entering the piston cavity of the hydraulic cylinders 6, produces an accelerated feed plate 4 to the contact of the pistons 20 of the hydraulic cylinders 6 with the stops 21 located inside these hydraulic cylinders. At the moment of contact of the porn 20 with the stops 21, the support rods 8 exit from the holes 10 of the rotary ring 9. The ring 9 turns under the action of the spring 15, which, by swinging the lever 16 relative to the axis 17, moves the rocker 18 rigidly connected with the rocker 18 the rotary ring 9. When the rotary ring 9 closes the space between the support rods 8 and the holes 11 in the movable plate 4, the working fluid is fed into the rear non-matching plate - the plunger hydraulic cylinder 3 of the power lock and The liner 7, the support rods 8, the slewing ring 9 and the plate 4 produce a force locking form. The disclosure of the form is carried out in the following II. The working fluid flows under the plungers 12 and moves the crossheads 13 together with these plungers through the hollow plunger 7 and hydraulic cylinders 6. Moving in the opposite direction, the bare plunger 7 releases the rotary ring 9, after which the ring 9 under the action of the plunger hydraulic cylinder 14 compressing the spring 15, returns to its original position, in which the holes 10 in the ring 9 are located coaxially with the holes 11 in the iodil plate 4 and with the support rods 8. Moving in the opposite direction, the hydraulic cylinders 6 tons put stops 21 20 connected with a movable plate 4, whereby there is a force disclosure form. Next, the working fluid enters the shtick cavity of the hydraulic cylinders 6 and rapidly returns the movable plate 4 to its original position. The proposed invention allows to simplify the design and maintainability of the locking mechanism, use support rods as side ejector and increase the reliability and speed of the locking mechanism as a result of replacing four locking elements with one moving high-speed drive. Due to the fact that the support pads are installed on the inner end of the hollow plunger of the power cylinder and pass through the holes in the movable plate, the distance between the working fluid pressure end of the plunger of the power cylinder decreases by an amount equal to the thickness of the movable plate, which entails an increase stiffness, reducing the length and the metal mechanism of the lock. Claim 1. Mechanism of locking the molds of a plastic injection molding machine, containing connected front and rear fixed columns, mounted mobile columns on columns, built-in hydraulic cylinder of power lock with hollow plunger integrated into the rear fixed plate, hydraulic cylinders of accelerated movement of movable center, support rods and movable locking cylinder an element characterized in that, in order to reduce the metal intensity, the laboriousness of the manufacture of the locking mechanism and the expansion of its technological capabilities The mechanism is equipped with a traverse with a drive located behind the fixed back plate for opening the molds on which the hydraulic cylinders of the accelerated movement of the basement plate are mounted, the supporting sterles are mounted on the inner end of the hollow plunger, and the locking element is designed as a ring with a hole mi for the passage of the support center mounted with the possibility of rotation on the basement plate, also provided with holes for the passage of the support rods. 2. The mechanism according to claim 1, characterized in that the drive for rotating the ring is made in the form of a plunger hydraulic cylinder and an elastic element connected by a double-arm lever to the rocker cam mounted on the end of the ring. Sources of information taken into account when examining 1. USSR author's certificate number 152560, cl. In 29F 1/06, 1962. 2. Zavgorodniy V. K- Injection molding machines for thermoplastics and thermoset plastics. M., “Mapptroenie, 1968, p. 185, p. 104 / "