An emergency stop button with stable safety control performance

Abstract

The invention relates to the technical field of intelligent equipment parts, and discloses an emergency stop button with stable safety control performance, comprising a casing, a normally closed contact, a normally open contact, a moving contact, a normally closed spring, a valve stem, and a mushroom head and return spring, the normally closed contacts and the normally open contacts are arranged in a cross in the horizontal plane direction, a downward spiral groove is opened on the inner wall of the top end neck of the casing, and an upper part of the outer wall of the valve stem is provided with The lower screw bar is adapted to the lower screw groove, the downward horizontal projection of the lower screw groove and the lower screw bar is concentric circles, and the contact stroke between the movable contact and the normally open contact is the screw thread of the lower screw groove and the lower screw bar quarter of the pitch. In the present invention, a lower screw groove is arranged on the top neck of the casing, and the lower screw bar on the valve stem is matched with the lower screw bar to rotate and descend when the valve stem moves downward under pressure, so that the movable contact is connected to the normally closed contact. The initial separation of the points is carried out by rotating shear force, so that the separation can be more labor-saving and effective, so as to ensure the stability of its safety performance.

Description

technical field [0001] The invention relates to the technical field of intelligent equipment parts, in particular to an emergency stop button with stable safety control performance. Background technique [0002] The emergency stop button may also be referred to as an "emergency stop button". As the name implies, the emergency stop button is a measure that people can quickly press the button to achieve protection when an emergency occurs. The emergency stop button is generally composed of an operating part (mushroom head), a shell connection part (plastic case), and a control part ( Mounting seat) consists of three parts. The principle is as figure 1 As shown, including housing 1, normally closed contact 2, normally open contact 3, moving contact 4, normally closed spring 5, valve stem 6, mushroom head 7, return spring 8 and limit shield 9, the normally The two contacts on the closed contact 2 are connected in series to the main circuit of the equipment, and the two contac...

AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings of the existing emergency stop button in the use process proposed in the background technology, the present invention provides an emergency stop button with stable safety control performance, which has the advantages of easy separation of normally closed contacts and low possibility of self-resetting. Solved the problems raised in the above-mentioned background technology

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