CS224065B1 - Method of crushing and regeneration of circulating foundry sand and core mixtures - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to a device for crushing and regenerating returnable foundry molding and core compositions, particularly for gates made of water-bonded mixtures.

In the reuse of return molding and core compositions, important operations are crushing the lump of the return mixture and cleaning the surface of the grains of the pellet from undesirable impurities from previous use. This is achieved by a number of devices that first crush the lumps, such as crushers, such as jaws, hammers, drums, and then sand grains in other devices are wiped _off and cleaned. These are, for example, pneumatic equipment or mechanical mills where the grains are dry-wiped, or washing machines where the grain is cleaned in wet conditions.

The common disadvantages of these devices are the complexity of their design, low performance, low efficiency in crushing and cleaning of grains, and considerable pollution of the environment. In the case of water systems, this is a considerable consumption of purification water and energy consumption for drying the treated sand before it is reused. All of these difficulties are particularly evident in the regeneration of waterglass-bonded compositions which are otherwise advantageous from a technological and economic point of view.

In these types of mixtures, breaking up the lumps and removing impurities with a grain surface is particularly difficult.

The above-mentioned disadvantages are eliminated by the apparatus for crushing and regenerating the recycled foundry molding and core compositions according to the invention, consisting of a prosmys hopper, a drive motor and a recovery vessel with a regenerate outlet. The principle of the device according to the invention consists in that a rotating wear disc is arranged in the collecting vessel under the height adjustable hopper, which is connected to the shaft of the drive motor. The drive motor shaft passes through the bottom of the collection container.

Advantages of the device according to the invention are high efficiency both in the breaking of clods and in the cleaning of grain surfaces.

224 065 yearly, high hygiene level, easy regulation of the amount of sand passing through and thus control of regeneration efficiency.

An exemplary embodiment of the device according to the invention is shown schematically in the attached drawing showing a device for crushing and regenerating the returnable foundry molding compositions in cross-section.

Example

An apparatus for crushing lumps and regenerating a return furnace for forming into self-curing mixtures with water glass and liquid hardener containing lumps of 200 to 300 mm diameter and strength in the return mixture, having a β pressure of 5 ^ 6 ItiPa, consists of a rotating disc The bottom of the collecting container 6 is raised at the point of the shaft passage to prevent the ingress of sand. The passage is sealed against the ingress of dust. The bearing of the shaft in the passage through the bottom of the collecting container 6 is rotatable and is provided with a bearing. The drive motor 3 and the shaft are firmly attached to the supporting structure of the device by means of a bearing in the passage of the bottom of the collecting container 6. The collecting container 6 with the outlet 7 and the hopper 2 are fixed to the supporting structure. the hopper 2 can be raised and lowered, thereby changing the distance 2 between the rotating wear disc 1 and the hopper

2. A grinding wheel 1 with a diameter of 500 mm and an axial feed of a mixture of 4 sand and lumps were used for crushing the lumps and regenerating the sand. To drive the wear disc 1, a 5.5 kW drive motor was used. The rotations of the wear disk 1 have been set between 16 and 24 revolutions per second and the distance 5 between the rotating wear disk 1 and the hopper 2 has been set to 5 to 20 mm. Under these conditions, the power could be regulated continuously in the range of 2.5 to 4 ', 75 t / h passing through the return mixture.

The method of crushing and regenerating the foundry molding compositions was carried out in such a way that the clods of the return composition, when held firmly by the hopper 2, were intensely disrupted by the abrasion of the rotating abrasive disc 1. Further intensive cleaning of the sand grains occurs as they rub against each other during the outward movement from the hopper 2. The individual sand grains are due to the friction imparted by a rotating disc 1. kinetic energy, which is used to further clean the grains surface upon impact.

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6. The passing amount of the return mixture, the fineness / exiting portions, and the regeneration efficiency can be controlled by increasing or decreasing the distance 5 between the wear disk 1 and the hopper 2 and changing the speed of the wear disk 1.

Claims (1)

SUBJECT OF THE INVENTION Apparatus for crushing and regenerating foundry molding and core mixtures, consisting of a hopper for a return mixture, a drive motor and a recovery vessel with a regenerate outlet, characterized in that a rotating abrasion vessel is located under the height adjustable hopper (2) a disc (1) which is connected to a drive motor shaft (3) passing through the bottom of the collecting container (6).