SU1177050A1 - Drum for knocking-out and cooling castings and moulding sand - Google Patents

Abstract

1. DRUM FOR REMOVAL AND COOLING OF CASTINGS AND FORMING MIXTURES, containing a cylindrical body mounted rotatably about a horizontal axis, having a front conical section and a rear conical section with spiral protrusions on the inner surface, an anterior suction chamber with a loading window, a system of regulated water supply, A device for separating the molding mixture, characterized in that, in order to achieve the efficiency of cooling of the castings and the molding mixture, preparation and homogenization mixes for subsequent use and reliability in operation, the drum is equipped with an airlock installed on the front chamber of the suction from the side of the loading window and made in the form of freely suspended curtains, the rear chamber of the suction placed above the device for separating the molding sand, made in the form of a multifaceted, truncated pyramid with with the apex, directed towards the movement from Ki “livok, the edges of which are formed by SS rods with left between them (L longitudinal windows, and the slope of the faces from: the pyramid to the drum axis is equal to n angle of the blades. 2. A drum according to claim 1, characterized in that the inclined blades in the loading zone are set at an angle of 29-31 ° & to the horizontal axis of the rabbit with the subsequent transition to the angle of inclination 2 ° 30 ° - 3 ° 30 °, I ate

Description

The invention relates to a foundry industry, namely, a device in the form of a rotating drum around its own axis, used for knocking out and controlled cooling of castings together with a lump of molding mixture: preparing and homogenizing the mixture for further use and subsequent separation of the castings from the mixture. The purpose of the invention is to increase the cooling efficiency of castings and molding sand, preparing and homogenizing the mixture for subsequent use and reliability in the operation of the entire device. FIG. 1 shows the proposed drum, a general view; in fig. 2 - the same, top view; in fig. 3 shows section A-A in FIG. 2; in fig. 4 is a view B in FIG. one; in fig. 5 shows a section B-B in FIG. 41 in FIG. 6 — node I in FIG. 2, in FIG. 7 - section G-Y in FIG. 6; in fig. 8 is a section d-d in FIG. 2, in FIG. 9 - node II in FIG. 8 in FIG. 10 shows section EE of FIG. 8, in FIG. 11 is a view of FIG. 10. The drum for knocking out and cooling the castings and the molding mixture contains a vibrating channel 1 for loading coma (casting with molding earth), a front suction chamber 2 with a loading window, an airlock 3 (FIGS. 4 and 5), consisting of freely suspended curtains 4 with bushings 5 on the axis x 6, secured, for example, by linch pins 7, a cylindrical drum body 8 with a front conical section 9, blades 10 of the lead-in part 11 (FIG. 3 placed on the inside of the drum case and installed in its lead-in part and in the drum loading at an angle of about 29-31 to about and then go to the angle of inclination p 2 ° 30 - 3 ° 30 to the drum axis. There are two rows of windows 12 (Figures 6 and 7) along the drum contour for taking samples of the molding mixture for humidity and temperature control which are provided with flaps 13 mounted in sleeves 14 on the axis x 1 The drum body has a rear cone section 16 with spiral protrusions for castings and molding sand. The drum also includes a device 17 for separating the molding sand from castings, made in the form of a polyhedral truncated pyramid | consisting of a housing 18 with stiffeners, brackets 19 for attaching the cleaning grid 20, which forms the face of a truncated pyramid installed at an angle of UZ - 3 ° 30 to the drum axis consisting of rods 21 (Fig.8 and 9) of the support plates 22 and ribs 23. The drum also includes a housing 24 serving as a tray for exit from the sleeves, a rear suction chamber 25. The drum is rotated using tires 26 and support rollers and is driven by the drive 27 through a gear train 28. The drum also contains an aggregate complex 29 of stationary pyrometric transducers and radiation pyrometers (APIR-C), a system 30. automatic adjustment of moldability (CAP ©), water supply system 31, pipelines 32c with sprays. The drum for knocking out and cooling the castings and the molding mixture works as follows. Depressed from the flask (casting with molding sand) transport device is fed to the vibrating tray 1 and loaded into the continuously rotating cylindrical drum body 8 through the front conical section 9. The blades 10 with their lead-in part 11 inclined to the drum axis at an angle of 29-31 , quickly move the com (in order to avoid jamming) from the place of loading. Further movement of the coma along the axis of the drum is carried out by blades 10 inclined to the axis of the drum at an angle of 2 ° 30 -. During the rotation of the drum, the casting and mold mixture are raised with paddles and rolled down. Moving the castings in the molding mixture contributes to their mixing, and hence the heat transfer between them. The molding mixture in the front of the drum is moistened through the water supply system 31 and the nozzles 32. Heat is removed from the castings and molding sand as a result of the evaporation of water and removed by means of the front chamber 2 of the suction. Aerozatvor 3 and the rear suction chamber 25 make it possible to create an intensive airflow of the castings and the mixture inside the drum. The molding mixture and the castings by the spiral protrusions of the rear conical section 16 are transferred to the device 17 to separate the molding mixture from the castings, from where it is poured through the cleaning grids 20 onto the conveyor belt and returned to the mixing and preparation section. The castings, separated from the mixture, are transferred through a cone 24 to a transport device and are fed to a groove.

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Claims (2)

1. Drum for knocking and cooling of castings and mold mixes, comprising a cylindrical body mounted rotatably relative to the horizontal axis, having a front conical section and a rear conical section with spiral projections on the inner surface, a front suction chamber with a loading window, a regulated water supply system, a device for separating the molding mixture, characterized in that, in order to increase the cooling efficiency of the castings and molding mixture, preparation and homogenization of the mixture For subsequent use and reliability in operation, the drum is equipped with an airlock installed on the front exhaust chamber from the side of the loading window and made in the form of freely suspended curtains, with a rear exhaust chamber located above the device for separating the molding mixture, made in the form of a multifaceted, truncated pyramid with a top directed towards the movement of the castings, the faces of which are formed by rods with longitudinal windows left between them, and the inclination of the pyramid faces to the axis of the drum is equal to the angle of inclination of the blades . 2. The drum according to claim 1, characterized in that the inclined blades in the loading zone are installed at an angle of 29-31 ° to the horizontal axis of the drum, followed by a transition to an angle of inclination of 2 ° 3θ '- 3 ° 30 ^Z.