FR2574326A1 - Sand-supply device for a shooting or blowing machine - Google Patents

Abstract

Sand-supply device for a shooting or blowing machine comprising a double storage hopper 1, 1', a double machine hopper 2, 2', a double cap 3, 3' for closure of these hoppers, a machine reservoir 5 separated into two compartments 6, 6' by a deflector 7 and equipped with two contact probes 8, 8' respectively positioned in the compartments, for the control of the separate openings of the double cap, and a shooting or blowing nozzle 9 also divided into compartments by the deflector 7. Application particularly to the manufacture of cylinder-head (furnace-end) cores in hot core boxes.

Description

SAND FEEDING DEVICE FOR SHOOTING MACHINE
OR BLOWING.

The present invention relates to a sand supply device for a blowing or blowing machine.

The production in hot or cold boxes of sand cores is commonly carried out by blowing or blowing machines which are fed by a hopper in a single sand.

To improve production rates and reduce the number of machines and the number of tools, users are turning to large format machines. This development leads to a complication of tooling such as a multiplication of fingerprints of cores in a tool or the creation of a collection of cores for the manufacture of a single part with a tool. For example, an internal combustion engine cylinder head requires three or four cores.

However, these cores must, in certain cases, have different qualities of sand to meet the quality requirements relating to the manufacture of the corresponding parts.

 The subject of the invention is therefore a device for supplying sand for a shooting or blowing machine which allows the use of two types of sand (grain size, etc.) and / or of separate compositions.

According to an essential feature of the invention, this device successively comprises - a double thermally insulated storage hopper - a double machine cooled hopper, extending the double hopper
storage - a double helmet closing these hoppers, ordered by at
minus a pneumatic cylinder - a machine tank separated into two compartments by a
deflector, and equipped with - two contact probes respectively
positioned in these compartments for the control of
independent double helmet openings - and a cooled blast or blast nozzle, and also
compartmentalized by this deflector.

This feature makes it possible to conserve existing tools by improving the quality of the cores produced.

The invention will be better understood on reading the following description of a preferred embodiment, given - by way of nonlimiting example with reference to the accompanying drawings in which - Figure 1 shows a schematic front view of a device
sand supply according to the invention, associated with a
blowing machine partially illustrated - Figure 2 shows a schematic side view of
the installation illustrated in Figure l; - And Figure 3 is a bottom view of the double hoppers of
feeding device shown in figures l and 2.

Referring to Figures 1 and 2, a sand supply device according to the invention comprises two fixed and transferable 20 parts 30. The fixed part has - a double storage hopper 1, I 'insulated - a double machine hopper 2 , 2 'cooled - and a double helmet 3, 3' closing these hoppers, command '
by two pneumatic cylinders 4, 4 '.

The transferable part includes: - a machine tank 5 separated into two compartments 6, 6 'by a
deflector 7, and equipped with two contact probes 8, 8 '
respectively positioned in these compartments - and a blown nozzle 9 cooled, and also compartmentalized
by this def reader 7.

This transferable part is positioned either under the fixed part 20 or under a blowing head 11 of a coring machine 10, above a core box 12.

This sand feeding device operates as follows
The double storage hopper 1, I 'and the double machine hopper 2, 2' are fed with two prepared sands of different natures and / or compositions, with passage sections illustrated in FIG. reservoir 5 and the blowing nozzle 9 is produced with the independent openings of the double helmet 3, 3 ', controlled by the two respective contact probes 6, 6'. This operation is carried out during the cooking of the cylinder head cores; the machine reservoir 5 and the blowing nozzle 9 are positioned under the double hoppers 1, 1 ′, 2, 2 ′ (cf. the left part of FIG. 1 in dashed lines). At the end of the cycle of - the machine of blowing 10 (cooking and extracting the cores), the reservoir 5 and the nozzle 9 are transferred under the blowing head 11, just above the core box 12 (cf. the right part of FIG. 1). The rise of the core box then allows the tank and the nozzle to be pressed under the blowing head in order to blow out the cores. The two sands contained in the compartments 6, 6 'fill the respective imprints 13, 13' of the core box 12 by supply nozzles 14, 14 'according to a predetermined distribution obtained by means of the deflector 7.

This operation is followed by the descent of the core box 12 into the cooking position, and the transfer of the reservoir 5 and the blowing nozzle - 9 under the double hoppers 1, 1 '2, 2'.

Depending on the sand masses Testing in the compartments 6, 6 ', the two contact probes 8, 8' will independently control the openings of the helmets 3, 3 ', which can nevertheless - occur simultaneously. This last operation makes it possible to compensate for the lack of sand in the tank following the blowing of the previous cores, and to keep a constant mass or volume of sand in the two compartments of the tank and the nozzle in order to guarantee in a certain way , the appearance and quality of the nuclei.

Claims (1)

CLAIM Sand supply device for a blowing or blowing machine, characterized in that it successively comprises: - a double insulated storage hopper (1, 1 '), supplied with  two sands of different natures and / or compositions - a double machine hopper (2, 2 ') cooled, extending the double  storage hopper - a double helmet (3, 3 ') for closing these hoppers, ordered  by at least one pneumatic cylinder (4, 4 ') - a machine tank (5) separated into two compartments (6, 6') by  a deflector (7), and equipped with two contact probes (8, 81)  respectively positioned in these compartments (6, 6 ') for the  control of the independent openings of the double helmet (3, 3 '); - and a cooled blowing or blowing nozzle (9), and also  compartmentalized by the deflector (7).