RU223238U1 - Molding sand cut-off valve - Google Patents

Abstract

The utility model relates to the field of foundry production. The shutter-cutter of the molding mixture between the upper and lower flasks of the mechanism for pairing the halves of the molding machine is made in the form of a gable curved steel sheet (2, 3) with an obtuse angle at the apex of 140°. The sheet is enclosed in a frame (1) made of a profile pipe and has stiffening ribs. On the sides of the frame, plates are welded coaxially to each other for attaching guides to the frame, ensuring the movement of the shut-off valve along them. Under the ridge of the gable steel sheet there is a fork (9) for attaching the pneumatic cylinder rod. At the ends of the frame there is a flange (10) consisting of steel strips welded at one end to the upper edge and at the other to one another. It is ensured that the molding mixture does not get onto the finished lower flask when filling the upper flask with the molding mixture into the mechanism for pairing the mold halves of the molding machine. 2 salary f-ly, 4 ill.

Description

The utility model relates to foundry production, in particular to the design of a protective flap between the lower and upper flasks, which allows the molding mixture falling from above to be removed beyond the contour of the lower flask when it fills the upper flask of the mold mating mechanism of the molding machine.

The technical solution for the utility model is designed to prevent the molding sand from getting into the lower flask that was previously filled with it when filling the upper flask of the mechanism for pairing the halves of the molding machine.

A sand blower for the manufacture of foundry molds is known from the field of technology (patent for invention RU No. 2033884, priority dated May 30, 1991), including a frame, a platform, a sand thrower head with a rotor with fixed buckets, as well as gates and a hopper in which a damper is located, which together with the above-mentioned gates allows you to regulate the supply of molding sand in the device.

A device for the manufacture of foundry molds is known (patent for invention RU No. 2472600, priority dated May 24, 2011), in particular, including a hopper-dispenser valve for supplying and filling the flask and filling frame of the above device with the molding mixture.

A device for dry regeneration is known (patent for invention RU No. 2022679, priority dated April 19, 1991), in which the cylindrical working chamber is equipped with a horizontal annular partition installed between the upper edges of the main one, fixed at the end of the drive shaft and additional rotors of the device, as well as in the upper Part of the working chamber is equipped with a gate valve with a pipe for supplying sand-bentonite mixtures.

A device for cooling and homogenizing a foundry molding sand is known (patent for invention RU No. 2137569, priority dated 04/04/1995), in which two two-chamber airlocks are provided, each of which contains controlled switchable and exhaust valves for creating and maintaining a vacuum in the device body at periodic a repeating automatic process of hot molding sand passing through a two-chamber gateway and feeding it onto a vacuum conveyor of the device.

A device is known for the manufacture of forms and cores from plastic mixtures by pressing method (Author St. USSR No. 1804014, priority dated 07/04/1990), in which the profiled valve is made mated to the sleeve with the ability to move in the lower part of the working chamber of the device for cutting off and sealing the lower parts of the working chamber from its total volume during the process of pressing molding sands and making molds and cores from them.

As a prototype, a molding sand dispenser device was selected according to application for invention RU No. 95102908, priority dated March 01, 1995, which contains a supply hopper and a dosing box with gates and flat rotary valves located in the made compartments of the dosing box, separated by vertical partitions, while the above the dampers are made profiled in accordance with the profile of the equipment being filled with the mixture and are placed in each compartment with the possibility of rotation relative to the horizontal axis and are connected by means of cranks and rods with a drive for their rotation.

The main disadvantage of the damper designs of the analogues and the prototype is the lack of protection against the ingress of molding sand onto the molded surface of the already filled, formed lower flask of the mechanism for mating the halves of the molding machine, while an additional disadvantage of the profile dampers is a complicated, more expensive design.

Thus, the technical result, which consists in preventing the molding mixture from getting onto the finished lower flask when filling it into the upper flask of the mechanism for mating the halves of the molding machine, is achieved by changing the design of the shutter valve placed between the upper and lower flasks of the mechanism for mating the halves of the molding machine.

A damper-cut-off valve for the molding sand between the upper and lower flasks of the mechanism for pairing the halves of the molding machine, characterized in that it is made in the form of a gable curved steel sheet with an obtuse angle at the apex of 140°, guaranteed to ensure pouring of the molding sand along the sides of the damper beyond the lower flask through the pit to the zero level of the workshop when filling the upper flask with molding sand; having stiffening ribs, enclosed in a frame made of a profile pipe, with plates welded by welding, located relative to the horizontal axis of the steel sheet on the sides of the frame coaxially to each other for fastening by means, in a particular case, with screws with lock washers, guides for moving the shut-off valve along them, and also contains a fork located under the ridge of the gable steel sheet for attaching the pneumatic cylinder rod, which ensures the working stroke of the recoil valve. Additionally, there is a flange at the ends of the frame, in a particular case, consisting of steel strips welded at one end to the top edge and at the other to one another, vertically located and inclined to it at 45°.

The essence of the utility model is characterized by graphic materials

in fig. 1-4, where in FIG. 1 shows a general view of the equipment;

in fig. 2 - top view of the shut-off valve with guides 4;

in fig. Figure 3 shows a side view of the shut-off valve;

in fig. Figure 4 shows one of the guide mounting points in a longitudinal section.

The damper-cutter of the molding mixture of the lower flask of the mechanism for pairing the halves of the molding machine consists of a frame 1 of rectangular section made of a profile pipe, in the center there is a gable surface 2, 3 with stiffeners 11. Plates 4 are welded on the sides with threaded holes for fastening the guides left 5 and right 6 , which are fastened with screws and lock washers - groovers 7, 8. These guides move along rollers (not shown in the figure) of the mechanism for pairing the mold halves of the molding machine. Under the gable slope there is a fork 9 for fastening the pneumatic cylinder rod to ensure the working stroke of the shut-off valve. On top of the frame there is a flange 10 (made of a steel strip 10 mm thick), consisting of two steel strips - a vertical one and one inclined to it at 45°.

Research carried out using sources of patent and scientific and technical information has shown that the claimed design of the molding sand cut-off valve of the lower flask of the mold mating mechanism of the molding machine is unknown, that is, it meets the “novelty” criteria.

In the foundry, comparative tests of two options were carried out:

1) when using a frame structure from a frame made of a 50 mm profile pipe, with a straight bottom, and fins, molding soil accumulated, which required its cleaning at intervals of 1 time per hour, while spills fell on the molded surface of the casting in the lower half of the mold, which led to to casting defects;

2) when using the design (Fig. 1) of a curved cut-off valve with an obtuse angle of 140° at the apex (Fig. 1), the effect of completely preventing the molding mixture from falling onto the molded surface of the lower half-mold from above is fully ensured.

In the conditions of a foundry, during the manufacture of foundry molds from sand-clay mixtures (SGS), a prototype of a molding sand cut-off valve was manufactured, included in the design of the molding machine of the lower flask of the half-mold mating mechanism, corresponding to the criterion of “industrial applicability” with the following parameters.

The damper-cutter of the molding mixture of the lower flask of the half-mold mating mechanism includes a frame 1 of rectangular section made of a 50 mm profile pipe, in the center there is a gable steel sheet 2, 3 (3 mm thick) with stiffeners 11 (made of steel strips 3 mm thick). Plates 4 (made of steel sheet 30 mm thick) are welded on the sides with M12 threaded holes for fastening the guides left 5 and right 6, which are secured with screws and lock washers - groovers 7, 8 to ensure the movement of the guides along the rollers (not shown in the figure) of the mating mechanism . Under the gable slope there is a fork 9 for fastening the pneumatic cylinder rod, which ensures the working stroke of the shut-off valve. On top of the frame there is a flange 10 (made of steel strips 10 mm thick), consisting of two welded steel strips - vertically located and a strip inclined to it at 45°.

The shutter valve is spatially located in the opening between the lower and upper flasks in the mechanism for pairing the mold halves of the molding machine. The molded lower half of the mold is covered with a shutter, above which there is an upper flask for filling it with molding sand. When feeding the molding sand, its excess along the beveled sides of the cut-off valve is poured outside the contour of the flask and through the pit reaches the zero level of the workshop.

Claims (3)

1. The cut-off valve of the molding sand between the upper and lower flasks of the mechanism for pairing the halves of the molding machine, characterized in that it is made in the form of a gable curved steel sheet with an obtuse angle at the apex of 140°, ensuring guaranteed removal of the molding sand on the sides of the cut-off gate when filling the molding mixture of the upper flask, which has stiffening ribs, enclosed in a frame made of a profile pipe, with welded plates located relative to the horizontal axis of the steel sheet on the sides of the frame coaxially to each other for attaching the guides to the frame to ensure the movement of the shut-off valve along them, as well as contains a fork located under the ridge of a gable steel sheet for fastening the pneumatic cylinder rod, with an additional flange at the ends of the frame, consisting of steel strips welded at one end to the upper edge and at the other to one another. 2. The shut-off valve according to claim 1, characterized in that the guides are connected to the plates by screws with lock washers. 3. The shut-off valve according to claim 1, characterized in that the flanging at the ends of the frame is made of steel strips located vertically and inclined to it at 45°.