SU1107951A1 - Device for charging sand to moulding box (modifications) - Google Patents

Abstract

one . A device for loading sand into a flask consisting of a bunker and a loading device connected by a pipeline and a dissector, characterized in that, in order to increase productivity, it is equipped with a vacuum gate made of hollow, parallel-mounted with a gap and carrying filters on the discharge side beams, the cavity of which is made with the possibility of alternate communication with the vacuum system and the atmosphere, placed with a gap relative to the bottom plane of the loading device, and also provided with nom comprising a perforated partition and set rigidly associated framework for fixing perforated (A septum.

Description

2. A device for loading sand E to a flask consisting of a bunker, a metering device and a loading device connected by a pipeline, and a dissector, characterized in that, in order to simplify the design, the loading device is made

110795

a flat filter box and piping with wires for feeding sand to the center and periphery of the filter.

3. A device according to claim 2, characterized in that pockets communicating with a vacuum system and having additional filters are provided along the periphery of the flat box.

The invention relates to the foundry industry and can be used for the seamless loading of the flasks and vacuum film forming, as well as in other industries when performing similar tasks. A device for loading sand into a flask is known in a vacuum forming machine, consisting of a sand bin installed on the flask, and a pipeline 1j. The disadvantages of the known dust extraction device during loading are the limited filling speed of the flask, the need to level the sand and remove its surplus from the flask control, which reduces the performance of the device. It is also known a device for supplying sand to a flask during vacuum forming, consisting of a hopper and a loading device, a pipeline connected and a splitter. This device provides a dustless loading of the flasks 12. However, the limited speed of filling the flask with sand, caused on the one hand by the air leaking through the gap between the flask and the film before filling the bottom of the flask of sand; Flasks, and a limited diameter of the pipeline, with one-time need razravnat sand, reduces the performance of the device. At the same time, the design of this device is complicated due to the introduction of a bunker with a complex device - a dispenser device into its scheme. irifii:::,::; geni - increase pro; -; f. J j, irM: .-: - And simplify the design L l i arrange, I Uzzazannak goal is achieved by the fact that to load sand in the OPOK5 state -; -: uvee from the hopper and the boot-device, connect; pipes, and the dissector, is equipped with a vacuum gate, made of hollow, parallel installed with a gap and carrier filters on the discharge side of beams, the cavities of which are configured to communicate with the vacuum system and the atmosphere, and placed with a gap relative to the bottom plane of the loading device It is also provided with a tray containing a perforated partition and a set of rigidly connected frames for fixing the perforated partition. In addition, the loading device is made in the form of a piled box with a filter and pipelines for sand supply, leading to the center and the periphery of the filter. At the same time on the periphery of the flat box can be made pockets, communicated with a vacuum system | and having additional filters. FIG. 1 shows a device for loading sand at the moment it is installed on a box in FIG. 2 - node j in FIG. 1-; in fig. 3 is a section A-A in FIG. 2, in FIG. 4 shows the device in the sand filling position on the pallet; FIG. 5 - the same, in the position on the pallet with the changed position of the partition; in fig. 6 - option boot device; in fig. 7, the second variant of the boot device in FIG. 8 - the node in FIG. 7

A device for loading sand into a flask includes a hopper 1 with sand walls perforated in the lower part, a pipeline 2, a loading device 3 with filters 4, sealing elements 5 and vacuum shutter beams 6 installed parallel to each other with a gap a between themselves and equipped with filters 7 on the unloading side. The internal cavity of the beams 6 of the vacuum gate using a three-way valve 8 can be connected to the atmosphere and to the vacuum system. The device also includes a tray 9 with a perforated partition 10, a set of frames 11 with cavities 12 and 13, a valve 14, a vacuumized model plate 16 with model 16 and facing film 17. In the first embodiment, the loading device consists of a flat box 18 with a filter 19, a valve 20 and pipes for sand 21 (Fig. 6).

In the second variant, the device includes pockets 22 with additional filters 23 and autonomously vacuum cavities 24.

The drawings also show flask 25 and low flask 26.

The device for loading sand into the flask works as follows.

The empty loading device 3 is installed on the pallet 9 with the valve 14 closed and connected to a vacuum system (not shown) filters 4 of the loading device 3 and filters 7 of the vacuum shutter 6. At the same time, sand 3 moves from the hopper 1 through pipe 2 to the device 3. air nojOKOM passing through the perforations of the walls of the bottom of the bunker 1. At the same time, the cavity 12 above the partition 10 is filled with sand. Coy flask 17 and set 25. Then, the cavity 13 of the valve tray 14 is connected to the atmosphere, which allows to separate a feed device 3 from the pallet 9.

The loading device 3 lifted above the pallet 9 carries a constant amount of sand in the cavity above

vacuum gate 6 and an additional amount of sand under it. The latter is necessary in order to increase the height of the flask 26 or

reducing the volume of the model kit would not have to replace the loading device 3. The additional quantity is adjusted by changing the volume of the cavity 12 with the help of the device 11 for moving the partition 10, which is a set of rigid frames that can be bolted and installed inside the pan 9.

The inner surfaces of the frames form a cavity having the shape of a truncated pyramid or a cone (depending on the shape of the flask). Adjustment of additional sand

is achieved by changing the position of the partition 10 between the frames of the device 11.

FIG. 5 shows the boot

the device 3 on the pallet 9, in which the partition 10 is lowered to the height of one frame, which increased the volume of the cavity 12 of the pallet.

Sand filled boot

the device 3 is installed on the flask 25 and the vacuum from the filters 4 and 7 is disconnected, temporarily together with the atmosphere, which causes the additional amount of sand to collapse on

film. After that, the vibrating table on which the flask is standing (not shown) is turned on, and the vacuum is connected to the filters 4 and 7 and the flask filters. The flask is filled with 25 sand and

its compaction, as well as the suction of a certain amount of sand from the hopper 1 to the loading device 3. After the sand is compacted in the flask 26, the vacuum gate filters 7 by the crane

8 are connected to the atmosphere, whereby a stream of air is generated in the gap Q, which is sucked off by the flask filters 25 and the filters 4 of the charging device 3. Thanks

This sand is leveled on the back of the flask, and the loading device can easily be lifted, since in the gap b the pressure becomes close to atmospheric and does not prevent the device from lifting. The remaining sand in the device remains on the beams of the vacuum gate 6, held by the vacuum in the cavity of the device 3 and hanging in

gaps A The loading device 3 is again placed on the:; bottom 9 with the valve 14 closed, where the device is filled with 3 sand. Then the cycle repeats. While the tool 3 is filled with sand, the finished mold is removed from the vibrating table and a new flask 25 is installed.

During the production of flasks of inconsiderable height, the design of the loading device 3 can be simplified and made according to the variant (Fig. 6). At that, the device is made in the form of a flat box 18 and supplying sand with pipelines 21, mainly located around the perimeter of the filter 19, for that to quickly fill the gap between the flask 26 and the film 17 with sand.

The fixture 13 is installed on the pallet 9 and the cavity 12 is filled with sand with the valves 14 and closed. 20. Then the valve 14 of the poddo is opened at 9 and the loading device 3 is transferred to the flask 26. The flask filters 26 are turned on, the vacuum from the loader 3 is disconnected for a short time and communicated with the atmosphere, causing sand to collapse on the film 17, then the valve is opened 20 and connect the vacuum. The vacuum created in the flask and the location of the pipelines 21 along the perimeter of the filter 19, in combination with vibration, allow the flask to be quickly filled with sand. Then the valve 20 is opened and the vacuum is turned off, after which the loading device: 3 is removed from the flask 26. Then the cycle repeats.

The fixture can be made according to the second variant (Figs. 7 and 8) in the form of a flat box 18 with pockets 22 located around the periphery of the filter 19, to which the pipelines 21 are connected and in which additional filters 23 are installed, connected through independent cavities 24 to a vacuum. In the second version, the loading device-3 works without a pallet 9. After filling the flask 26, the autonomous cavities 24 are left vacuumed, due to which sand is retained in the pockets 22. Therefore, when, when installed on empty flask 26, fixture 3 is installed and communicated with the atmosphere of cavity 19, sand from pockets 22 collapses on film 17, covers the space between flask 26 and film 17. Then, in the described sequence, fill flask 26 with sand.

The invention allows for seamless loading of flasks with high productivity, has wide technological capabilities, which is manifested when loading flasks of various capacities, simplifies the design compared with the available solutions, reduces the amount of equipment on the molding lines, and facilitates their maintenance.

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Claims (3)

1. A device for loading sand into the flask, consisting of a hopper and loading device, connected by a pipeline, and a divider, characterized in that, in order to increase productivity, it is equipped with a vacuum shutter made of hollow, parallel mounted with a gap and carrying filters from the side unloading beams, the cavity * of which is made with the possibility of alternating communication with the vacuum system and the atmosphere, placed with a gap relative to the lower plane of the loading device, and also equipped with a pallet containing a perforated partition and a set of rigidly connected frames for fixing the perforated partition. Fi g. 4 SU „„ 1107951 2. A device for loading sand into the flask, consisting of a hopper, a metering device and a loading device connected by a pipeline, and a divider, characterized in that, in order to simplify the design, the loading device is made in the form of a flat box with a filter and pipelines for feeding sand, brought to the center and periphery of the filter 3. The device according to p. 2, characterized in that on the periphery of the flat box made pockets in communication with the vacuum system and having additional filters