SU1577987A1 - Arrangement for cleaning surface of moulds - Google Patents

Abstract

The invention relates to the processing of plastics, the removal of scrap from the surfaces of the molds after injection molding products. The goal is to expand technological capabilities. For this, the pressing mechanism of each pair of brushes is made in the form of a ram cylinder with two spring-loaded pistons and a notch at the end for the hinge installation of the brushes and has the possibility of axial orientation. The mechanism of oscillatory movement of the brushes is made in the form of a drive shaft with eccentrics. Under the action of the power cylinders, the carriage moves between the half-molds, the brushes receive an oscillatory movement in the perpendicular direction, the removal and deflation of the mold occurs from the surface of the mold. 1 hp f-ly, 7 ill.

Description

The invention relates to the processing of plastics, in particular, to removing flash from the surface of molds after injection molding products, and can be used to mechanize the process of plastic sealing of semiconductor devices on segments of the lead framework by injection molding.

The purpose of the invention is the expansion of technological capabilities.

FIG. 1 shows the device, a general view; in fig. 2 - the same, top view, partial section, movable carriage in the cabin; in fig. 3 shows the node I in FIG. 2; in fig. 4 — device, general scheme; ng FIG. 5 - the mechanism of the pressing of the brushes and the mechanism of the oscillatory movement of the brushes; in fig. 6 shows section A-A in FIG. 1 (partial); in fig. 7 is a section BB in FIG. 6 (partial).

The device comprises a suspension type carriage 1 mounted on cantilever guides 2 in the form of a channel rigidly connected by clamps 3 with press columns 4, on the plates of which a mold with the lower 5 and upper 6 half-molds is fixed, movable brushes 7 with bundles of thermal fi monofilament, located in the upper part of the carriage and associated with the mechanism for clamping the brushes and the surfaces of the half-form, the mechanism 9 of the oscillatory movement of the brushes, the mechanism 10 for moving the carriage located in the suspension cab 11, which is mounted on nsolnyh guide 2, a control panel 12 mounted on the front of the cab.

The carriage includes a housing 13, in the upper part of which on the front walls there are internally fixed axles 14 with rollers 15 for movement along prismatic rails 16 laid on the bottom shelf of the guides 2, and semi axles 17 with rollers 18, with the springs pressed against the upper shelf . Air knives 30 are located on the lower and upper parts of the transverse stacks, and ball guides 21 for sliders 22 are installed inside the body. Each pair of upper and lower sliders are connected by a rigid link to frame 23.

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The brush clamping mechanism 8 comprises power cylinders 24, each of which has two pistons 25 with compression springs 26 in the rod part. Fork-shaped stems 27. The cylinders on either side have through holes in the cylindrical part to accommodate the shackle 28 with the axial orientation of the cylinder fixed by a pin 29 on the slider 22, and on the extension of the fork-shaped part that includes the lug of the axial displacement a step groove for placing one of the edges of the brush body fixed by axis 30. The common rod cavity in the center of the cylinder is connected to the pressure controller 31 placed on the control panel with the possibility of axial movement rods with variable effort when changing pressure regulator knob 32.

The mechanism 33 for oscillating motion of the brushes is made in the form of a single drive shaft 34 with eccentrics 35 mounted on bearings 36 in the carriage housing 13 coaxially with its axis of movement. The shaft is connected through a coupling 37 with an engine 38 mounted on the plate 39 of the housing 13, and connected with each pair of brushes using a connecting rod 40, which is fixed through the bearing 41 on each eccentric, enters the other side into the groove located in the center of one of the rigid the frame 23, and is connected to it by an axis 42 with the possibility of returning the movement of the brushes in the direction perpendicular to the axis of movement of the carriage. After this, the engine 38 (Fig. 4) is equipped with a speed control knob 43 and, at speed) 44 (shown YCVOBHO), the technical solution can be implemented using one of the known means of adjustment. The speed knob on the adjustment knob 45 is located on the control panel. The carriage movement mechanism 10 is made in the form of cylinders 46 located parallel to its axis with rods 47. The cylinder bodies are fixed in ball bearings 48 on the cab rear wall 49, the rods are connected to the carriage by ball bearings 50 rigidly fixed on the ends of the rods and in glasses 51; zanna with the carriage body. The piston and rod cavities of the cylinders are connected to the throttles 52, 53 placed on the control panel for each area, with the possibility of reciprocating movement of the carriage to the zone and out of the mold at a variable speed when the throttle setting is changed by handles 54, 55

The pneumatic installation scheme (Fig. 4) contains an air preparation system with a filter 56, a pressure regulator 57, a pressure gauge 5G and an oil detector 59, a control system with a pressure gauge 60, a pressure regulator 31, throttles 52, 53, a valve. M 62. 63, gchueyge e and 54, CHCTCMV

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a blower with a pressure regulator 65, a pressure gauge 66, a valve 67, a throttle 68 associated with the air knives 20.

The device operates in the following sequence.

When sealing devices with long fittings such as lead frames, a thin layer of compressible material may form on the surface of multi-seat molds, formed after polymerization of plastic, which must be removed, while adhesion with the surface of the mold may be different.

After the mold is opened and released, the valve 62 is turned on from the sealed products (Fig. 4), compressed air is supplied through the choke 52 into the piston cavity of the cylinders 46 and the rods 47 move the carriage 1 on the rollers 15 ps to the guides 2 to the half-frame 5, 6 At the initial entry of the brushes 7 into the indicated zone, the valve 61 is turned on, the compressed air is supplied through the pressure regulator 31 into the common piston cavity of the cylinder 24, the brushes are pressed by the ends of the beams to the surfaces to be cleaned C, D with the same force controlled by the pressure gauge 60. Menno motor 38 is turned on and npijvodnogo during rotation of the shaft 34 and connecting rod 40 the oscillatory movement occurs WHO-Vera-IEG posgupatelnoe brushes movement in a direction perpendicular to the axis of movement of the carriage. At the same time, by turning on the valve 67, compressed air from the blowing system is supplied to the air knives 20. A process of removing torches of hard beams from thermo-fixed monofilament around the surfaces of the mold is going on. When the entire cleaning zone passes, the valves 62, 63 switch to the reverse movement of the carriage, while the compressed air is fed into the rod end of the cylinders through the throttle 53. The cleaning process continues. The skirt, blown off from the surfaces, is removed from the mold zone by suction (not shown). Before the brushes leave the brushing area, the brushing of the brushes is turned off and the blowing of the air knives is stopped. The carriage returns to the cabin 1 to its original position. If the surfaces are not sufficiently cleaned, the cycle can be repeated without changing the cleaning parameters.

If necessary, you can increase the pressure of the brushes by changing the settings of the pressure regulator 31 by the handle 32, the duration of one cleaning cycle by changing the settings of throttles 52 by the handle 4 (forward), throttles 53 by the handle 55 (reverse), the oscillatory speed of the brushes by changing the speed of rotation of the shaft engine 38 setting knob 44 speed knob 45.

Thus, the device has wide technological capabilities for cleaning prrso-frrm from oblo with distinct adhesion.

with the surface, depending on the brand of press material, its storage time, technological modes of changing the surface quality of the half-molds during operation and other conditions.

The device makes it possible to automate the process, for example, the plastic sealing of semiconductor devices, in terms of the mechanization of labor when cleaning the mold and preparing it for the next sealing cycle. All this ultimately improves productivity, improves working conditions in the hazardous and dangerous operation of plastic sealing of semiconductor devices and reduces the influence of the human factor on the process.

Claims (2)

Invention Formula I. Device for cleaning the surface of the mold, containing installed on guides of the carriage with a housing and with movable brushes in its upper and lower parts, the mechanism of pressing the brushes to the surfaces of the mold, the mechanism of oscillatory movement of the brushes, the mechanism of moving the carriage along the axis and the cabin with a control panel, characterized in that in order to expand technological capabilities, it is equipped with bullets placed on five 0 five Controls of the pressure regulator and throttles, the pressing mechanism of each pair of brushes are designed as perpendicular to the axis of the power cylinder with two spring-loaded pistons and forked rods with a notch at the end for the hinge mounting of the brush and rigidly mounted on sliders mounted on the frame the body, earrings, placed and through holes, made in each cylinder flow, and the common piston cavities of these cylinders are connected to the pressure regulator, the mechanism of oscillatory movement of the brushes Designed as an eccentric drive shaft mounted in a carriage coaxially with its axis of movement associated with each pair of brushes by means of a connecting rod fixed at one end on the eccentric and pivotally connected with the other end of the slide frame, while the carriage movement mechanism is designed as power cylinders connected to the throttles and hinged to the cab, their rods are hinged to the carriage, and the cab is mounted on the console arms. 2. The device according to claim 1, characterized in that the mechanism for oscillating movement of the brushes is provided with a unit for controlling the speed of rotation of the drive shaft and the speed adjuster. 32 FIG. I SI} 62 I I S3 | I HTPfb fefTiry MffT t D R j / # i rarr w w; BO  -w S3 57 65 BS Memory uh Fig.Z w tf / about oo oo o T -J I 47 -L -2J 26 M FagL d gpf 21 CZ 21 TO and 1% L.1ЈI id