Check valve sand supply device of sand ejector

Abstract

The invention relates to a check valve sand supply device of a sand ejector. The check valve sand supply device comprises a sand hopper, a valve body, an upper valve seat, a lower valve seat, a box body, an iron box, a pneumatic switch, a first conveying air pipe and a second conveying air pipe, wherein a hollow valve cavity is formed in the valve body, a limiting plate is arranged in the valve cavity, the limiting plate is provided with a circular ball valve, the upper valve seat and the lower valve seat are respectively provided with a sand flow hole, the sand hopper is fixed on the upper valve seat, the bottom of the sand hopper is provided with a sand inlet, the box body is fixed below the lower valve seat, a sand ejection passage is formed in the box body, the first conveying air pipe is connected and communicated with the sand ejection passage, the second conveying air pipe is connected and communicated with the bottom of the valve cavity, and the iron box is arranged below the box body. According to the check valve sand supply device, the circular ball valve is controlled by a pneumatic device to be switched on or off, the accurate reciprocating work state of a valve core is guaranteed, the valve core is relatively reliable to reset, the malfunction rate of the check valve is greatly reduced, the reliability of the check valve is improved, the sand leakage defect of a traditional plugboard sand supply device can be solved, and the operating environment can be greatly improved.

Description

technical field [0001] The invention relates to a sand supply device for a sand shooting machine, in particular to a one-way valve sand supply device for a sand shooting machine. Background technique [0002] At present, most of the sand supply devices in the sand shooting machine used in the iron mold sand-covered casting process use pneumatic inserting plate type sand supply devices, such as figure 1 As shown, the inserting plate 18 of the device not only has serious sand leakage and sand running during the plugging and unplugging process, resulting in a large amount of waste of coated sand, but also due to the existence of sand leakage and sand running, workers must promptly Increasing the amount of sand in the sand bucket increases the labor intensity of workers and reduces the operating efficiency of the production line. [0003] For this reason, in response to the above problems, the sand supply technology of the sand shooting machine has also been improved. At presen...

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Problems solved by technology

[0004] The object of the present invention is to aim at the above-mentioned defects, to provide a more compact structure, more reliable use, and a low failure rate check valve sand supply device for the sand shooting machine. The round ball valve of the check valve of the device is operated by a pneumatic device Control, not only solves the traditional phenomenon of sand leakage and sand running, but also solves the defects of easy fatigue of the spring, damage and inconvenient replacement

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