Self-adaptive gas check for die pad on punching machine

Abstract

The invention discloses a self-adaptive gas check for a die pad on a punching machine. The self-adaptive gas check is characterized by comprising a fixed seat and a piston, wherein an air bag or a cylinder body of an air cylinder is fixedly connected to the lower end of the fixed seat in a sealing manner; the fixed seat is provided with a first air passage, and the piston is arranged in the fixedseat and is in sealing sliding fit with the fixed seat; a spring mounting cavity is formed in the lower end of the piston, and the spring mounting cavity communicates with the first air passage; a spring is arranged in the spring mounting cavity and abuts between the piston and the fixed seat; the piston is provided with a second air passage which communicates with the first air passage; a sealingring is fixedly arranged on the upper end face of the piston, and the sealing ring abuts against the lower end face of a sliding block gas storage cavity; and the second air passage communicates withthe sliding block gas storage cavity. The self-adaptive gas check has the advantages of good sealing performance and convenience installation, no rigid connection such as bolts and positioning devices are needed at a gas-tight connecting opening between the gas check and the sliding block gas storage cavity, the loosening and displacement conditions of the gas check and the sliding block gas storage cavity are avoided, and meanwhile, maintenance is further very simple.

Description

technical field [0001] The invention relates to a punch press, in particular to an self-adaptive airtight device for a die pad on the punch press. Background technique [0002] The upper die pad is a device installed on the slider of the press and has a similar effect to the stretching pad. It realizes the functions of shallow drawing forming and edge pressing of stamping parts through the stroke and pressure of the air bag or cylinder. At present, the air bag or cylinder block in the upper die pad is generally directly connected to the slider through screws, and communicates with the air storage cavity in the slider, such as figure 1 As shown, the lower end of the airbag 100 is fixedly connected with the top plate 200, the upper end of the airbag 100 is sealed and connected with a fixing seat 300, the fixing seat 300 is fixedly connected with the slider 400 through screws, and the airbag 100 is connected with the air storage cavity 500 on the slider 400 Pass. Since the sp...

AI Technical Summary

Problems solved by technology

Since the space for installing the upper mold cushion in the slider is relatively narrow, and the structure needs to be connected by screws to ensure the airtightness between the air bag and the air storage chamber, which makes the installation and maintenance of the upper mold cushion more complicated and difficult , and cannot be inspected, and the screws between the fixed seat and the slider are easy to loosen during the long-term stamping vibration of the slider, resulting in air bag leakage, which makes minor faults major repairs

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