SU1740129A1 - Die-casting machine locking mechanism - Google Patents

Abstract

SUMMARY OF THE INVENTION: The locking mechanism is provided with a pushing plate 11 fixed to the end of the rod 7 of the hydraulic cylinder 5. The carriage 6 is mounted on the rod 7 movably. When the locking mechanism is closed, the pushing plate 11 interacts with the pivoting arms 8. At this time, the carriage 6 slides freely over the rod 7 and moves them until the pressure angle # reaches 60 °. In the process of further movement, the rod 7 with its protrusion rests on the carriage 6 and through the levers 10.8 and 9 moves further the plate 4 to the closing. The presence of the pushing plate 11 and the execution of the carriage 6 movable will reduce the angle of rotation and the levers 8 of the locking system and thereby increase the stroke of the plate 4. 3 sludge.

Description

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The invention relates to foundry, in particular to injection molding machines.

Almost all modern injection molding machines are equipped with lever mechanisms to lock the mold.

- All known lever mechanisms for locking the mold have high rigidity, high speed, easy to manufacture, but have a limited course of the movable plate, which reduces the technological capabilities of the machine.

Closest to the present invention, there is a mechanism for locking molds for injection molding machines, comprising a fixed plate and a movable block with two plates, between which a hinged-lever device is installed, made in the form of two symmetrical assemblies, each of which contains three levers of them are external, pivotally connected to each other and with plates, and the third is internal, connected to an external lever and a carriage fixedly connected with the rod of the locking cylinder. In the initial position, the external levers of the hinged-lever device are deflected outward from the axis of the locking cylinder, while the internal levers are located to it at an angle of 90 °.

This mechanism also does not allow to increase the motion of the movable block without increasing the size of the mechanism along the length, since this would lengthen the arms and cylinders that move the movable block during the process of closing the mold, since moving the movable block is possible only up to the stop of the plate-holder at the end of the nut on the column. In addition, the mechanism is structurally complex, slow-moving due to the large number of operations during the closing and opening of the mold, requires a lot of energy, since during the operations of closing and opening it is necessary to move the entire mobile unit, and also does not have free space to install the hydraulic ejector .

The purpose of the invention is to expand the technological capabilities of the machine by increasing the stroke of the movable plate.

This goal is achieved by the fact that the machine locking mechanism is molded under pressure, containing a fixed plate and a link plate, interconnected by columns, a movable plate mounted for movement along the columns, and a drive of the movable plate made in the form of a hydraulic cylinder , a carriage mounted on the hydraulic cylinder rod, and a symmetrical system of levers, including a pivot arm pivotally mounted on the link plate, a thrust lever that is spherically connecting the movable plate with a turn lever, and a drive lever that pivotally connects the carriage with a rotary lever, equipped with a pushing plate,

rigidly fixed at the end of the rod of the hydraulic cylinder with the possibility of interaction with one of its plane with the pivoting lever, and the opposite plane with the carriage, while the carriage is installed with

possibility of movement along the rod axis.

FIG. 1 shows the locking mechanism, the initial position; in fig. 2 - the same in

the moment of moving from the starting position; in fig. 3 - the same, after making a move to close.

The locking mechanism comprises a fixed plate 1 and a plate 2 of links, interconnected by columns 3, a movable plate 4 mounted for movement along the columns 3.

The drive of the movable plate 4 is made in the form of a hydraulic cylinder 5. fixed in

2 link plates, a carriage 6 mounted on the rod 7 of the hydraulic cylinder 5 with the ability to move along the axis of the rod 7, and a symmetrical system of levers including the pivot arm 8. pivotally mounted on the plate 2 links, the thrust arm 9 pivotally connecting the movable plate 4 to the pivot the lever 8, and the drive lever 10 pivotally connecting the carriage 6 to the pivoting lever 8.

The pushing plate 11 is fixed at the end of the rod 7 with the possibility of one of its interaction with the pivoting arm 8, and the opposite with the carriage 6. The stroke of the movable plate 4 when

unchanged overall dimensions of the locking mechanism depends on the angle of rotation o. of the pivot arm 8 in the initial position (Fig. 1), the smaller the angle a, the greater the stroke of the movable plate, since after completing the stroke close (Fig. 3) the pivot arm 8 always takes the same position - the axes of the rotary and thrust levers arranged in pairs on the same line.

However, to prevent the locking mechanism from starting position to closing position without knocks and shocks due to the kinematics of the lever system of the existing locking mechanisms, the pressure angle at the actuator lever 10 swing lever 8 should not be greater than 60 ° (angle (p between the straight line through axles 12 and 13 drive lever 10 and perpendicular, recovered from axis 13 to a straight line drawn through axles 13 and 14. This same restriction, the allowable pressure angle of 45-60 °, is introduced for hinge mechanisms and according to the theory of mechanisms and machines,

In the limit, if the angle p approaches 90 °. axes 12-14 will lie almost in the same straight line and the mechanism is locked in the open position.

The proposed mechanism provides smooth moving at angles tp greater than 60 °.

The locking mechanism works as follows.

At the initial moment of movement of the rod 7 to the right (Fig. 1), the actuating levers 10, whose pressure angle p on the rotary levers 8 is greater than 60 ° (in Fig. 1 in the particular case p 74 °), do not act on them, since the carriage 6 is free slides along the rod 7 and does not transmit the force, and the pushing plate 11 rests against the roundings at the ends of the pivoting levers 8 and turns them around the axes 14, since the pressure angle p of the pushing plate 11 to the pivoting levers 8 is always less than the pressure angle tp (in a particular case p 37 °).

Upon further movement of the rod to the right and rotation of the pivoting levers 8, the carriage b, slides along the rod 7, reaches its ledge (Fig. 2) and the force of the rod 7 is transmitted to the pivoting levers 8 through the driving levers 10, but in this position the pressure angle p will be less 60. ° (in Fig. 2 p 44 °).

The rod 7 moves to the right until the pivot arms 8 and the thrust

the levers 9 are not aligned coaxially (FIG. 3). When the locking mechanism returns to its original position, the rod 7 moves to the left and the pushing plate 11, abutting the carriage 6, transmits force to the entire lever system.

The use of the proposed mechanism allows to expand the technological capabilities of the machine due to

increasing the stroke of the movable plate by increasing the angle of rotation of the pivot arm, which allows to set higher molds, which are the nomenclature of larger machines.

FORUMAWLAH AND ISLANDS

The machine locking mechanism is an injection molding containing a fixed plate and a link plate, interconnected by columns a movable plate mounted for movement along the columns, and a drive of the movable plate made in the form of a hydraulic cylinder fixed in the link plate of a carriage mounted on the rod of the hydraulic cylinder and

a symmetrical system of levers, including a pivot arm, hinged on the link plate, a thrust lever pivotally connecting the movable plate with the pivot arm, and the drive lever,

a hinged carriage with a swivel lever, characterized in that, in order to expand the technological capabilities of the machine by increasing the stroke of the movable plate, it is provided with a pushing

a plate rigidly fixed at the end of the rod of the hydraulic cylinder with the possibility of one of its interaction with the pivoting lever, and the opposite plane with the carriage, while the carriage

mounted, movable along the axis of the rod.

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Claims (1)

15 claims The locking mechanism of the injection molding machine, comprising a fixed plate of links, interconnected by columns, a movable plate mounted for movement along the columns, and a movable plate drive made in the form of a hydraulic cylinder mounted in a link plate, a carriage mounted on the rod hydraulic cylinder, and 25 symmetrical leverage, including a pivot arm pivotally mounted on the link plate, a thrust arm pivotally connecting the movable plate to the pivot arm, th drive arm, 30 hinge but connecting the carriage with a pivot arm, it is possible that, in order to expand technological capabilities. machine capabilities by increasing the stroke of the movable plate, the pH is equipped with a pushing plate 35, rigidly fixed to the end of the hydraulic cylinder rod with the possibility of interaction of one. a plane with a rotary lever, and the opposite plane with a carriage, while the carriage 40 is set to move. along the axis of the stem.