Lamppost and extension cylinder thereof

Abstract

The invention relates to a lamppost and an extension cylinder thereof. The extension cylinder comprises a gas passage and a gas check valve, wherein the gas passage is provided with a holding cavity, a first channel and a second channel; the first channel and the second channel are respectively communicated with the first end part and the second end part of the holding cavity; the first channel is also communicated with the pressurizing port of the extension cylinder; the gas check valve is provided with a moving part, and the moving part is arranged in the holding cavity and the first channel; when the extension cylinder is pressurized through the pressurizing port, the extension cylinder moves toward the second channel direction under the gas pressure of the first channel, so as to conduct the gas passage; when the pressurizing on the extension cylinder through the pressurizing port is stopped, the extension cylinder moves toward the first channel direction under the gas pressure of the second channel, so as to seal the gas passage; and the holding cavity is also provided with a gas relief valve, which is used for discharging gas out when being opened. When gas is not introduced to the gas pump, the inside pressure of the cylinder can be maintained, thus the weight of the light fitting is supported, and extension cylinder does not generate automatic shrinkage.

Description

【Technical field】 [0001] The invention relates to a telescopic cylinder, in particular to a telescopic cylinder with a gas cut-off valve and a light pole. 【Background technique】 [0002] In outdoor night lighting operations that require a large area, for example, when used for outdoor operations in firefighting, army, railway, electric power, public security, railway, petrochemical, petroleum, etc., it is difficult to use mains power at construction sites that are far away from the mains , And for example, various large-scale construction operations, maintenance and repair, accident handling and rescue and disaster relief work sites often require large-area, high-brightness lighting, and cannot obtain the support of municipal lighting. [0003] In the prior art, when the lamp is supported for lighting operation, the lamp pole is lifted by the telescopic cylinder, thereby supporting the lamp. [0004] However, after the telescopic cylinder lifts the light pole, when the air ...

AI Technical Summary

Problems solved by technology

[0004] However, after the telescopic cylinder raises the light pole, when the air pump does not refill the air, the air pressure in the cylinder is not enough to support the weight of the lamp, which often causes the telescopic cylinder to automatically shrink, which brings inconvenience to the operators.

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