A pin fastening structure for quick clamping of upper and lower boxes of sand casting

Abstract

The invention discloses a pin fastening structure for quick clamping of an upper box body and a lower box body of sand mold casting. An L-shaped sliding groove hole is formed in the box wall of the lower box body. The bottom of the L-shaped sliding groove hole is connected with a drum-shaped sliding block in a sleeving manner. The drum-shaped sliding block is connected with a screw rod and a rocking rod. A sliding sleeve is sleeved with the upper portion of the L-shaped sliding groove hole. The sliding sleeve is connected with a cylindrical sliding block through a first spring. A spring buckleis arranged on the cylindrical sliding block. An L-shaped sliding groove hole symmetric to the lower box body, a drum-shaped sliding block, a screw rod, a sliding sleeve and a cylindrical sliding block are arranged on the wall of the upper box body. A pin female head is fixedly connected to a cylindrical sliding block of the upper box body. The pin female head is particularly of an expansion sleeve structure surrounded by a plurality of annularly distributed grabbing rods, and the pin female head is internally connected with a conical sheet through a second spring. By means of the spring ejection principle, rapid combination and separation of the upper box body and the lower box body are achieved, the pin use mode of the female head pressing-female head ejection combination-male head andfemale head loosening-male head separation state-female head resetting is achieved, the pin fastening structure is suitable for the upper box body and lower box body combination process when sand moldcasting is needed, and the lag mode of existing heavy pressure compaction is thoroughly abandoned.

Description

technical field [0001] The invention relates to the technical field of sand casting of pig iron castings, in particular to a pin fastening structure for quick clamping of upper and lower boxes of sand casting. Background technique [0002] At present, sand casting is still the main molding method of pig iron castings. Sand casting generally uses two or three boxes to assemble and finally form the required sand core shape. After assembling several boxes, in order to avoid the sand core from being too loose, Generally, heavy parts are covered on the top of the upper box to prevent damage to the cavity structure caused by slippage between several boxes during the casting process. [0003] With the precision requirements of modern science for pig iron castings, this method of pressing the box with heavy objects is becoming more and more backward. In the actual use process, a slight touch of the box may cause damage to the cavity structure and cause casting failure. Contents of...

AI Technical Summary

Problems solved by technology

[0003] With the precision requirements of modern science for pig iron castings, this method of pressing the box with heavy objects is becoming more and more backward. In the actual use process, a slight touch of the box may cause damage to the cavity structure and cause casting failure.

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