Device for taking out loose piece of sand core of sand mold for large casings and using method of device

Abstract

The invention provides a device for taking out a loose piece of a sand core of a sand mold for large castings and a using method of the device. The device comprises an embedded jackscrew, a cover plate, positioning screw rods, a screw ejection rod, fastening screws and a torque bar. A long through hole is formed in the bottom of a mounting base. First through holes and second through holes are formed in the bottom of the mounting base. The embedded jackscrew comprises an upper cylinder and a lower cylinder. Through holes I are formed in the lower cylinder in a penetrating mode. The fastening screws are connected into the through holes I in a matched mode. One end of each fastening screw is screwed into the corresponding first through hole. Through holes II are formed in the lower cylinderin a penetrating mode. A through hole III is formed in the middle of the embedded jackscrew in a penetrating mode. An internal thread I of the through hole III is connected with an external thread ofthe screw ejection rod in a matched mode. A circular ring is arranged at one end of the screw ejection rod. The torque bar is arranged in the circular ring. Through holes IV are formed in the cover plate in a penetrating mode. Internal threads II of the through holes IV are connected with external threads of the positioning screw rods in a matched mode. One end of each positioning screw rod stretches into the corresponding second through hole. The device is simple in structure, low in cost, suitable for standard production, high in universality and convenient to operate.

Description

technical field [0001] The invention relates to the field of casting, in particular to a device for taking loose blocks from sand cores of large-scale castings and a method for using the same. Background technique [0002] The size of the model used for large-scale castings is relatively large. After the sand is placed in the molding, the mold is pulled out. The parts that are perpendicular to the mold-lifting direction and cannot be taken out will be separated from the model body in the form of loose blocks and wrapped in sand molds or sand cores. Therefore, the casting model movable block structure is widely used in sand casting. Due to the large size of the model of large castings, the size of the loose block of the model is correspondingly large, and the contact area between the sand mold or sand core and the loose block becomes larger, thereby increasing the frictional resistance between the two interfaces. The work has been done slightly, but the process of taking liv...

AI Technical Summary

Problems solved by technology

The manual knocking and extraction method is particularly time-consuming and labor-intensive during the operation process, and the operator’s labor intensity is extremely high, especially for larger loose pieces of large castings. Often, it is necessary to repeatedly knock and shake dozens of times to take out a live piece. If the surface quality of the block is not good, it takes 3 hours to 5 hours to take out the live block, and the labor efficiency is extremely low

Although the special picking device can achieve smooth mold removal, it is not suitable for the removal of large castings, but only for the removal of small batches of castings. The versatility is not strong, the scope of application is limited, and the design of the device is not convenient , the operation process is cumbersome. For the single-piece and small-batch production of large castings, the molding operator has no interest in using it and cannot insist on using it.

The crane-assisted lifting method is suitable for the case where the loose block is located on the upper surface of the sand mold or sand core and leaks out of the lifting ring. This method needs to occupy crane resources, and the application range is small. The model live block is easily damaged and affects the model live block. service life

At present, there is no particularly efficient and convenient device and method to solve the problem of taking out large castings.

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