RU2229380C1 - Locking device to lock half-molds of injection-molding machine, for example, of a thermoplastautomatic (versions) - Google Patents

Abstract

FIELD: automatic injection-molding machines operation. SUBSTANCE: the invention presents a locking device to lock half-molds of an automatic injection machine and is dealt with the field of casting machines, in particular, with the equipment of pressure casting, and may be used for locking half-molds of thermoplastautomatics. The locking device has four pairs of slide blocks with the segment-shape cut-outs. In a closed position the slide blocks embrace plungers along their annular grooves inner diameter. The sliding blocks of counter direction motion in the different upper and lower pairs are fused in the same way by two 4 link equal-arm hinged lever systems (top and bottom). Two similar directed links in each of them are fused among themselves by a pull stud with a reciprocal motion drive mounted on it and other two are fused by the rod of the pull stud. In the first version the pivot axes of these links in respect to the pull stud and its rod and the rod axis are in the same plane. In the second version two apertures in these links in the place of fuse either with the pull stud or with the rod are made in the form of a groove. The technical result is an increase of an overall performance and improvement of the installation-operation properties. EFFECT: an increase of an overall performance and improvement of the installation-operation properties. 2 cl, 6 dwg

Description

This locking device relates to the field of injection molding machines, in particular, to injection molding equipment, and can be used to lock injection molding machine molds.

Known locking devices for locking the half-molds of injection machines containing a 4-link articulated lever system, two links associated with a reciprocating drive, the other two with crackers made with the possibility of oscillatory movement around a fixed center (see, for example, application No. 19544320 Germany for an invention published on 11/28/95).

The disadvantages of such locking devices include the impossibility of contact of the working surfaces of crackers when fixing the movable plate (with the half-mold) on one plane perpendicular to the direction of its movement, due to the movement of the crackers along the radius, which causes the introduction of teeth on the interacting surfaces of the crackers and rods of the movable plate that do not provide uniform distribution of the load along the length of the crackers, which means reducing their durability. In addition, the unilateral efforts of the crackers on the rods of the movable plate cause them to bend and, as a result, deterioration of contact in the aforementioned gear joints.

Closest to the claimed technical solution is the locking device of the locking mechanism for locking the semi-molds of the injection molding machine for plastics according to the author's certificate No. 306021 of the USSR, published on 06.08.1971. This device consists of two articulated lever systems mounted on a movable plate of the injection molding machine, two links of which are connected to the rod of the reciprocating drive placed between them, and two others are connected with four pairs of crackers made with segmented recesses in the closed position crackers covering rolling pin (associated with a fixed plate of the injection molding machine) along the inner diameter of their annular grooves.

The disadvantage of such a locking device is the increased stroke of the reciprocating drive, because due to the small size (relative to the movable plate) of the rolling pins, which means rusks, the shoulder of rotation of the link levers connected by a hinge to the pull rods of the crackers is much smaller than the shoulder of the levers of these links to the hinge on the rod of the reciprocating drive, which leads to large dimensions to its significant increase and, accordingly, to the growth of unproductive expenses. In addition, placing the drive in a horizontal plane with the direction of the rod inside the movable plate worsens the conditions for installation and maintenance of the locking device as a whole.

The technical task of the claimed locking device for locking the half-molds, for example, injection molding machine, is to increase operating efficiency by significantly reducing the stroke of the reciprocating drive, as well as improving the operational and installation properties of the locking device by arranging the drive in a vertical plane and installing it on the side of the movable plate.

The problem is solved due to the fact that in the locking device of the locking mechanism of the injection mold half-molds, for example, an injection molding machine, containing two articulated lever systems installed on the movable plate of the injection molding machine and connected by one link with a reciprocating drive located between them, and others - with four pairs of crackers, two upper and two lower, made with segmented recesses, in the closed position of crackers covering rolling pins (connected with a fixed plate) along the inside the same diameter of their annular grooves, crackers of the opposite direction of movement in different upper pairs, as well as in different lower pairs, are connected in the same way by two 4-link equal-arm articulated systems, and the drive housing of the reciprocating movement is mounted on a link connecting two equally directed links of the upper and lower hinged-lever systems, two similar other links of which are connected by the rod (two-sided) of this drive, moreover, in the first embodiment, the axis of rotation of these links but traction and stem and its axis are in the same plane; in the second, two holes in these links at the junction with either the rod or the rod are made in the form of a groove.

The claimed locking device of the locking mechanism of the semi-molds of an injection machine, for example, an injection molding machine, is illustrated in the drawings, where:

figure 1 shows the locking device according to option 1 in the working position, side view;

figure 2 is the same, front view, view a in figure 1;

figure 3 - the same, inoperative;

figure 4 shows a longitudinal section of a pair of crackers in the working position, section BB in figure 2;

figure 5 shows the connection of two 4-link systems with a drive according to option 2, view A in figure 1;

figure 6 shows a longitudinal section of a pair of crackers in the idle position, section bb in figure 3.

OPTION 1

The locking device of the locking mechanism of the semi-molds of an injection machine, for example, an injection molding machine, consists of a drive 1 (Fig. 1) of reciprocating movement, the body of which is mounted on a rod 2 connecting link 3 of the upper 4-link equal arm of the articulated lever system and link 4 of the lower. The rod 5 (two-sided) is connected via rods 7 and 6, respectively, with the link 8 of the lower articulated lever system and the link 9 of the upper. Links 3, 10 and 4, 11 are connected with crackers 12, and links 8, 13 and 9, 14 are connected with crackers 15. Each hinged-lever system has a central hinge 16, and their links are made with a groove 17, providing reciprocating movement rusks 12 and 15 in the guides 18 of the movable plate 19, on which the stops 20 are installed to limit and regulate the inoperative position of the rusks 12 and 15 (Fig. 3). Rusks 12 and 15 are made with segmented recesses 21 of diameter d — the inner diameter of the annular grooves 22 of the rolling pin 23 having a shoulder 24.

OPTION 2

The composition of the locking device of the locking mechanism of the injection molding machine is identical to the composition of option 1. The difference is in the displacement of the rod 2 relative to the drive 1 of the reciprocating movement and the holes in the links 3 and 4 in the place of their connection with the rod 2 in the form of a groove 25.

The claimed locking device of the locking mechanism of the semi-molds of the injection machine operates as follows.

OPTION 1

The movable plate 19 after a quick approach to the fixed plate (not shown in figure 1) as a result of closing the half-molds stops. In this case, the crackers 12 and 15 are in an inoperative position (divorced), defined by the stops 20, thus limiting the movement of all links of the upper and lower articulated lever systems. With the inclusion of the drive 1 reciprocating movement of its rod 5 begins to move up (figure 3), and the body down. Through the rods 2, 6 and 7, these movements are transmitted to the corresponding links of the 4-link articulated lever systems connected with crackers 12 and 15, which segment-shaped recesses 21 go into the annular grooves 22 of the rolling pins 23, ultimately covering them in diameter d. In this case, the hinges connecting the rods 6 and 7 and the rod 2 with links, respectively, 9, 8 and 3, 4 are moved around a circle of radius R, and the reciprocating drive 1 and rod 2 are displaced from the center of the movable plate 19 by a distance ΔL. After turning on the drive of the booster mechanism (not shown), the rolling pin 23 selects the gap ΔS and the shoulder 24 begins to act on the end surfaces of the annular grooves 22 of the crackers 12 and 15, and hence on the movable plate 19, thereby locking the molds. The lock device is put into an inoperative position according to the above scheme in the reverse order.

OPTION 2

The operation of the locking device of the locking mechanism of the half-molds is carried out in the above manner. The difference is as follows.

Due to the displacement of the position, for example, of the rod 2 relative to the drive 1 of the reciprocating movement to the center of the movable plate 19, the hinges of the rod 2 in the place of their connection with the links 3 and 4, in the case of movement along a circle of radius R ₁ less than the radius R of the circle along which they move the hinges of rods 6 and 7 connected to links 9 and 8 would have a lower linear speed in the horizontal direction than the latter. Given the rigid connection of the rod 2 and the drive 1 of the reciprocating movement, in the links 3 and 4, grooves 25 are made, which ensure relative movement of the rod 2 and the links 3, 4.

Thus, the connection of crackers of the opposite direction of movement in different upper and lower pairs of them with 4-link equal-arm articulated systems with the connection of two equally oriented parts of the upper and lower articulated-lever systems by means of a drive housing mounted on a traction and similar two others - its double-sided rod allows, reducing the travel of the reciprocating drive and placing it on the side on the movable plate of the injection machine, to increase the efficiency of mkovogo device lock mechanism of the mold halves, reduce overhead costs and improve the performance and installation of its properties.

Claims (2)

1. The locking device of the locking mechanism of the half-molds, for example, an injection molding machine, consisting of two upper and two lower pairs of crackers located on its movable plate with the possibility of reciprocating movement with a segment-shaped recess in each, in the closed position, covering rolling pins associated with the fixed plate, according to the inner diameter of their annular grooves, each of two crackers in different upper pairs, as well as in the lower ones, connected to a reciprocating drive located at I am waiting for them, with two articulated-lever systems, characterized in that the rusks of the opposite direction of movement in different upper pairs, as well as in different lower ones, are connected in the same way with each other by two four-link equal-arm articulated systems, while the reciprocating drive housing is attached on a rod connecting two equally directed links of the upper and lower four-link articulated lever systems, and its rod is connected to similar two others, and the axis of rotation of these links relate tionary and thrust rod and the rod axis are coplanar. 2. The locking device of the locking mechanism of the half-molds, for example, an injection molding machine, consisting of two upper and two lower pairs of crackers located on its movable plate with the possibility of reciprocating movement with segment-shaped recess in each, in the closed position, covering rolling pins associated with the fixed plate, according to the inner diameter of their annular grooves, each of two crackers in different upper pairs, as well as in the lower ones, connected to a reciprocating drive located at I am waiting for them, with two articulated-lever systems, characterized in that the rusks of the opposite direction of movement in different upper pairs, as well as in different lower ones, are connected in the same way with each other by two four-link equal-arm articulated systems, while the reciprocating drive housing is attached on a link connecting two equally directed links of the upper and lower four-link hinged-lever systems, and its rod is connected to similar two others, with two holes in these links in those compounds of either thrust or with a rod formed as a groove.

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