Conveying method and device for conveying sand box set with temperature change through hydraulic cylinder

Abstract

The present invention provides a conveying method and a device for conveying a sand box set without sand box stop position error when large thermal expansion amount of the sand box exists. The conveying method provided by the invention comprises the following steps: sand box gathering step in which a hydraulic push cylinder (1) operates for pushing the sand box set (3) which is configured in series to a hydraulic buffer cylinder (2) and eliminating a clearance (4); a conveying step in which the hydraulic push cylinder (1) operates in high speed and the hydraulic buffer cylinder (2) is switched to a high-back-pressure state for reducing speed in a speed reduction area, thereby conveying the sand box set (3) for a distance which is equivalent with the size of one sand box; and a final step for further retreating the hydraulic buffer cylinder (2) after the sand box set (3) is stopped, thereby forming a clearance (4) between the hydraulic buffer cylinder (2) and the sand box set (3).

Description

technical field [0001] The invention relates to a hydraulic push cylinder and a hydraulic buffer cylinder to clamp a sand box group with a large temperature change such as a casting sand box, and transport it at a distance (pitch) of the size of a sand box each time. Method and device for intermittent delivery. Background technique [0002] As shown in Patent Document 1, a technology has been known for a long time that uses hydraulic push cylinders and hydraulic buffer cylinders to clamp sand box groups arranged in series, and transports sand boxes one at a time with no gap between them. Intermittent conveying in the form of a box-sized distance. In Patent Document 1, a pneumatic cylinder is used to replace the hydraulic push cylinder and the hydraulic buffer cylinder, but the pneumatic cylinder has the following problems: it is difficult to finely control the working speed, working distance, etc., and it cannot fully cope with the heavy sand box. [0003] Therefore, the p...

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Problems solved by technology

In Patent Document 1, a pneumatic cylinder is used to replace the hydraulic push cylinder and hydraulic buffer cylinder, but the pneumatic cylinder has the following problems: it is difficult to finely control the working speed, working distance, etc., and it cannot fully cope with the heavy sand box

[0005] That is, in the method of Patent Document 2, in the case of cooling the flask, a conveying shortage (feeding shortage) of about 175 mm at maximum occurs, and the flask cannot be conveyed to a predetermined position.

In addition, when the temperature of the flask is excessively raised due to the secondary cooling of the billet after the binning, the conveying equipment is stopped during operation, and the stop position of the flask exceeds a predetermined position, there is a possibility that the casting equipment may be damaged.

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