Constant-temperature type oil-air-cylinder single-point needle valve hot runner

Abstract

The invention discloses a constant-temperature type oil-air-cylinder single-point needle valve hot runner which comprises a cylinder body, a top cover, a conical bottom cover, a hot nozzle body, a piston and a heater. The top cover and the conical bottom cover are fixed to the two ends of the cylinder body correspondingly. A stepped piston hole is formed in the cylinder body. The outer wall of the piston is in a step shape, and the piston is slidably arranged in the piston hole. A sealed space is formed between the outer wall of the piston and the cylinder body, and another sealed space is formed among the outer wall of the piston, the cylinder body and the conical bottom cover. A through hole is formed in the axis position of the piston, and the hot nozzle body is arranged in the through hole and sleeved with the heater. The cylinder body and the conical bottom cover are each provided with a cooling circulating water channel. The cooling circulating water channel in the cylinder body surrounds the cylinder body. The cooling circulating water channel in the conical bottom cover surrounds the conical bottom cover. In this way, it can be guaranteed that a single-point needle valve hot runner system stably operates at the normal working temperature of a sealing system, and the single-point needle valve hot runner system is long in service life, high in efficiency and low in maintenance cost.

Description

technical field [0001] The invention relates to the field of single-point needle valves, in particular to a hot runner for a single-point needle valve of a constant temperature oil-air cylinder. Background technique [0002] In the prior art, the single-point needle valve is composed of injection nozzle, cylinder block, piston, cylinder bottom cover, and hot nozzle body. Since the single-point needle valve cylinder has no cooling water channel, after the high temperature of the hot nozzle radiates to the cylinder, the temperature of the sealing ring After the high temperature limit of the sealing ring is reached, the aging speed of the sealing ring will be accelerated. After the sealing ring is damaged, the cylinder will not operate normally, which will affect the action of the valve needle of the hot nozzle. At the same time, the middle part of the piston of the hot nozzle of the single-point needle valve will be heated The main body of the nozzle and the heater are occupie...

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Problems solved by technology

[0002] In the prior art, the single-point needle valve is composed of injection nozzle, cylinder block, piston, cylinder bottom cover, and hot nozzle main body. Since the single-point needle valve cylinder has no cooling water channel, after the high temperature of the hot nozzle radiates to the cylinder, the temperature of the sealing ring After the high temperature limit of the sealing ring is reached, the aging speed of the sealing ring will be accelerated. After the sealing ring is damaged, the cylinder cannot operate normally, which will affect the action of the valve needle of the hot nozzle. At the same time, the middle part of the piston of the hot nozzle of the single-point needle valve is heated The main body of the nozzle and the heater are occupied, the cross-sectional area of ​​the piston is small, the thrust of the cylinder is insufficient, and the valve needle is easy to seal the rubber

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