A pressure loss protection type nitrogen gas spring

Abstract

The invention relates to a no-voltage protection type nitrogen spring, which comprises a cylinder, a fixed sleeve and a plunger, wherein the plunger is sleeved in the fixed sleeve, the fixed sleeve is arranged on an upper opening of the cylinder, a guide ring is arranged between the plunger and the fixed sleeve, and plays the guiding role for up and down movement of the plunger, an inflation valve which charges nitrogen into the cylinder is arranged on the lower end of the cylinder, a relief groove is arranged on the outer side of the fixed sleeve along the circumferential direction, a gap is formed between the relief groove and the inner wall of the cylinder, and a wall plate of the relief groove automatically deforms and cracks when a bearing pressure is bigger than a setting value, and releases the nitrogen in the cylinder, thereby achieving pressure relief protection. Compared with the prior art, the no-voltage protection type nitrogen spring is simple in structure and high in safety.

Description

technical field [0001] The invention relates to a nitrogen gas spring, in particular to a pressure loss protection type nitrogen gas spring. Background technique [0002] Now there are certain safety hazards in the use of nitrogen springs, because the nitrogen spring cylinder is filled with high-pressure nitrogen, and the nitrogen pressure in the cylinder continues to increase when the nitrogen spring is pressed down. When the nitrogen spring is not fixed, When tilting or slipping occurs in the process of pressing down, due to the sudden loss of external pressure, the high-pressure nitrogen in the cylinder will generate a strong reaction force to make the plunger move upward quickly. When the plunger hits the bottom end of the fixing sleeve, Due to excessive force, the plunger will break and fly out, resulting in damage to the mold above the plunger or injury to personnel. [0003] Chinese patent CN 201434036Y discloses a nitrogen gas spring for stamping dies. Compared with...

AI Technical Summary

Problems solved by technology

The utility model provides an over-travel protection type nitrogen gas spring, which is provided with an L-shaped exhaust channel under the punch. However, the problems of this nitrogen gas spring are: 1. It is only suitable for the protection of the downward pressure stroke when the pressure on the top of the piston rod is too large, but when the pressure on the top of the piston rod is suddenly lost, the piston rod quickly The piston rod breaks and flies out when it punches up and collides with the sleeve, resulting in damage to the mold or personal injury. There is no protection; 2. The pressure relief device is installed under the cylinder. When the pressure is released, the cylinder is damaged and may be squeezed. Deformation caused by compression and deformation, so that neither the sleeve nor the piston rod can be reused, so the cost of damage is high, and the economical practicability is poor

The spring structure also has no protection against the sudden loss of pressure above the piston rod and the piston rod rushes up quickly and hits the sleeve when the piston rod breaks and flies out, resulting in mold damage or personnel injury.

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