SU1458032A1 - Installation for cleaning articles - Google Patents

Abstract

The invention makes it possible to improve the quality of cleaning and expand the technological capabilities when cleaning various products, in particular, assemblies of the printed assembly with hinged radio elements. These products are cleaned by moving the products by initially washing them with a liquid poured from a bath over a special weir, then exposing the products to a finger with rotating brushes followed by ultrasonic vibrations and then washing with a washing liquid poured from a bath over the second weir. The specified sequence. This is achieved by positioning the bath under the product holders, supplying it with end-drive brushes, special weirs connected to the receivers. 1 hp f-ly, 4 ill. S (l

Description

one

The invention relates to the field of cleaning of various products, namely, printed wiring assemblies with mounted electrical radio elements of radio electronic equipment j REA; from flux residues due to soldering.

The aim of the invention is to improve the quality of cleaning and expand the technological capabilities of the installation.

Fig. 1 is a schematic diagram of an installation for cleaning products; figure 2 - bath ultrasonic cleaning; on fig.Z - section aa in figure 2; figure 4 - view B in fig.Z;

The device for cleaning products (see Figures 1 and 2) has successively located technological washing positions containing ultrasonic baths C2 and 3 with washing liquids and placed along a vertically closed bypass conveyor 4 with working branches, drying position 5, loading position 6 and 7 unloadings and an additional double-circuit vertically closed conveyor 8 with parallel horizontal working branches, placed under the main conveyor below the ultrasonic baths.

Conveyors 4 and 8 each contain two vertically closed chain loops 9, embedded in guides 10, which are mounted on a common base, and a holder of 11 products mounted on both horizontal working legs of conveyor 4.

Each bath 1-3 ultrasonic processing is placed between the chain. the contours 9 of the conveyor 4 and are made in the form of three chambers: the front 12, the middle 13 and the rear 14.

with y

The I 1 - articles holder serves to transport the products (group of products) along the conveyor 4 through technological positions and return them along the conveyor 8.

The bath is divided into three chambers 12, 13 and 14 with two weirs 15, each formed in the form of a hollow wall with an inclined tray, having channels 16 for supplying washing liquid to the processing zones Q of camera 13 and serving as a threshold for free heating. fluids into chambers 12 and 14. Channel 16 is terminated from above by mouth 17, and from below communicates with receiver 15 18.

The bottom of the middle chamber 13 is embedded. successively activators made in the form of a block of face brushes 19 and a block of ultrasonic piezoceramic-20 transducers 20, which conditionally divide chambers 13 into areas of mechanical and acoustic action. The plane of the products to be processed 21 and the working plane of the end brushes 19 are located above the mouth of the slot 17 canals 16, and the distance from the radiating surface of the unit of ultrasonic transducers 20 to the plane of the products to be processed is 21 times the length of the half-wave of the ultrasonic vibrations. The washing liquid is supplied through the receiver 18 to the channels 16 by the electric pump 22 via the main line 23 supplying the washing liquid from the washing liquid preparation unit (not shown) to the chambers 12 and 14 with the drain nozzles 24.

The installation works as follows .40

The processed product 21 (or a group of products) in the holder of 11 products after automated soldering of radio electronic elements ERE comes in

water with a temperature of 30 ± 5 ° C in a bath 3. The fluid-carrying fluid (TMS, tap and de-ionized water) from the washing liquid preparation blocks by pumps 22 through lines 23 supplying washing liquid is pressurized to receivers 18 to smooth out pressure fluctuations, and from there fluid is slit The channels 16 of weirs 15 through the mouth 17, the width of each of which is equal to the maximum width of the processed product 21, enters the chambers 13 of the baths 1,2 and 3, constantly filling them.

Spillway 15 forms a threshold contributing to the delay of free pouring of washing liquid and the excess (at constant backwater of the liquid through the mouth 17) of the liquid level in the treatment area above the edge of the mouth 17.

In this case, the liquids are monitored and regulated so that the height of the liquid column from mouth 17 to the liquid mirror is h aa „n + t + b, where is the distance from the upper surface of the substrate (board) of the product 21 to the body of the lowest electrical radio elements (mm); t is the thickness of the substrate (board) of the product (t 0.5-4 mm); b is the size of the gap between the mouth 17 and the lower plane of the substrate (board) of the product 21 (mm).

The washing liquid, which overflows through the threshold (weir 15), flows into chambers 12 and 14 and through drainage stations 24 is discharged into washing liquid preparation units for settling, filtration and recycling. The installation can be provided with a washing liquid and centralized with connection to the main distribution.

Installed on the conveyor 4 der

to the receiving section of the working conveyor belt 11 with the 4 positions 6 of the load fixed in it. From the loading position 6, the transposed holder 1.1 with the product 21 is sequentially processed (cleaned) in the baths i, 2 and 3, then dried in the drying unit 5 and delivered to the discharge position 7.

The technological process of cleaning flux residues after soldering consists in the sequential treatment of products 21 with a water solution of technical detergent (TMS) heated to 50t5 C in bath 1, tap water, water with a temperature no more than bath 2 and deionized

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moves into the ultrasonic bath 1, the passage of the chambers 12, 13 and 14 in succession. The chambers 12 and 14 serve, in addition, to prevent mixing of the washing liquids, playing the role of vestibules. In chamber 13, the product is subsequently affected by a lock by machining and an acoustic field.

At the first position / pre-cleaning) in the chamber 13 of the bath, the fluxes and other contaminants are removed with an aqueous solution of TMS at a glance

water with a temperature of 30 ± 5 ° C in a bath 3. The fluid-carrying fluid (TMS, water supply system and deionized water) from the washing liquid preparation blocks by pumps 22 through highways 23 supplying washing liquid is fed under pressure to receivers 18 to smooth out pressure oscillations, and from there liquid slotted channels 16 weirs 15 through the mouth 17, the width of each of which is equal to the maximum width of the workpiece 21, enters the chambers 13 of the baths 1,2 and 3, constantly filling them.

Spillway 15 forms a threshold contributing to the retention of the free overflow of washing liquid and the excess (at constant backwater of the liquid through the mouth 17) of the liquid level in the treatment area above the edge of the mouth 17.

In this case, the liquids are monitored and regulated so that the height of the liquid column from mouth 17 to the liquid mirror is h aa „n + t + b, where is the distance from the upper surface of the substrate (board) of the product 21 to the body of the lowest electrical radio elements (mm); t is the thickness of the substrate (board) of the product (t 0.5-4 mm); b is the size of the gap between the mouth 17 and the lower plane of the substrate (board) of the product 21 (mm).

The washing liquid overflowing through the threshold (weir 15) enters the chambers 12 and 14 and through the drain pipes 24 is discharged into the washing liquid preparation units for settling, filtering and recycling. The installation can be provided with a washing liquid and centralized with connection to the main distribution.

Mounted on the conveyor is 4 holder 45 with products 21 secured in it from position 6 of loading ne50

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moves into the ultrasonic bath 1, the passage in succession of the chambers 12, 13 and 14. The chambers 12 and 14 also serve to prevent mixing of the washing liquids, which serve as vestibules. In the chamber 13, the product is successively applied to the product with a lock, machining and acoustic field.

At the first position / pre-cleaning), in the chamber 13 of the bath, the fluxes and other contaminants are removed with an aqueous solution of TMS for

Saponification immersed to a depth equal to a + t, the surfaces of the processed product 2 and the use of physical. mechanical activators, which are face-brushes 19 rotating in various directions (mechanical action), block of ultrasonic transducers 20 (acoustic action) and temperature effect of heated liquid.

Neither the second position (final cleaning) in the chamber 13 of bath 2 is the removal of residues tMC and

ten

is 5: 1. Serial three-stage (TMS, tap and de-ionized water) ultrasonic treatment ensures high quality of cleaning, while 80-90% of the flux contaminants on the surface facing the Y-radiator are removed from the soldering side, and 20-10% of flux contaminants located on the ERE side are removed by ultrasound exposure, which is 30–35% of direct

pre-rinsing treatment is affected.

taped water surfaces using activators. Finishing cleaning of products 21 takes place in chamber 13 of bath 3 using activators and replacement reactions during treatment with reactive deionized water to obtain the required cleaning quality, characterized by high electrical resistance of the insulation of the product CEA. In each chamber, 13 ultrasonic baths 1, 2 and 3, article 21 passes through three regions: locks, mechanical and acoustic effects. In the area of the closure, wetting of surfaces immersed in liquid occurs, swelling of flux or other contaminants, destruction of the bonds between fats or residues of the previous washing liquid and surfaces to be cleaned, and partial removal of contaminants. In the area of mechanical action by face brushes, complete destruction of the bonds between

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Processing by drying products at position 5 of the entity is completed. Washed and dry products 21 in the product holders 11 are conveyed to the unloading position 7, from where they are moved with an elevator device to an additional conveyor 8 to return the product holders, and the products 21 enter the hopper or the next operation.

The invention makes it possible to use the installation in the complex of equipment under the conditions of flexible production systems, which significantly expands its technological capabilities, significantly improving the quality of cleaning, which is provided by a differentiated impact on the workpiece by locking, machining and acoustic field using a sequential track. - stage processing with various washing liquids, cleaning is carried out in a soft (alternate) mode, easily cleaned and contaminated - 40 controlled, controlled and wired, and their removal with a joint influence range. The quality of scientific research institutes of active liquid and scrubbing and expansion of technological possibilities of rotating face brushes of bones is structurally determined and 19. Rotating in opposite directions of end brushes (not less than two) provide repeated multi-directional action of the bristles on all points of the surface facing the brushes product 21 without damaging the electrical conductors 50 of the printed circuit board.

The final cleaning stage in the chamber 13 of the baths 1,2 and 3 is carried out in the acoustic field, where the pre-cleaned product under the gg between the contours of the conveyor eliminates the influence of acoustic and hydraulic penetration of contaminants from the branches of convective currents. When the automatiser is in the cleaning zone and allows for manufactured soldering, the ratio of the fluxing of the conveyor from non-corrosive to the soldering side and to the ERE. resistant materials.

the possibility of processing products of CEA with both hermetic and non-hermetic elements. The use of water and aqueous solutions as washing liquids is also positive for improving the quality and expanding technological capabilities and, in addition, leads to a significant cost. I think of light petroleum products.

Ultrasonic bath placement

The installation eliminates the possibility of damage to the markings, protective coatings of the ERE enclosures and printed circuit board conductors, and the appearance of hidden defects in the product.

Formula

the invention

Claims (2)

one . A device for cleaning products, containing a bath with ultrasonic transducers, filled with washing liquid, drying section, conveyor with working branches, product holders — placed on the working branches of the conveyor, the main line supplying washing liquid quality of cleaning and expansion of technological capabilities; the ultrasonic bath is equipped with at least two face brushes, two weirs, and two receivers, with the receivers located under the bottom of the bath and communicated 22 cftue.f 2 G8 g / g2 T a supply line for the washing liquid, and each of the weirs are made in the form of an external lateral channel relative to the bath with an inclined tray, each channel communicating with a corresponding receiver to ensure the outflow of washing liquid from the bath along the inclined trays, This end drive brushes are installed in the direction of the conveyor in front of the ultrasonic transducers and their working end surfaces are located above the upper cut. bathtubs and weirs, and the bathtub is located between the working branches of the conveyor under the product holders. 2. Installation according to claim 1, which is equipped with an additional dual-circuit closed conveyor with parallel horizontal working branches, with an additional conveyor installed under the main conveyor and ultrasonic baths. 22 15 GZ - GZ 1 3 (fJueA BUT 21 // 7 , L1 9 -70