Cantilever structure with anti-collision and puncture functions

Abstract

The invention discloses a cantilever structure with anti-collision and puncture functions, which comprises a puncture needle, a limit column, a guide sleeve, a sensor fixing seat, a photoelectric switch, a needle sensing piece and a pressure spring, wherein the guide sleeve is arranged at the lower end of the sensor fixing seat, the puncture needle sequentially runs through the centers of the sensor fixing seat and guide sleeve from top down, a cavity is formed between the inner wall of the guide sleeve and the outer wall of the puncture needle; the pressure spring is arranged in the cavity; the limit column is arranged at the lower end of the cavity and is in threaded connection with the outer wall of the puncture needle; the limit column can move up together with the puncture needle to compress the pressure spring, a needle sensing piece is arranged on the puncture needle, the needle sensing piece is arranged at the lower end of the photoelectric switch, the puncture needle moves upwards to the needle sensing piece to shield the sensing area of the photoelectric switch, and the cantilever stops moving. According to the technical scheme, the anti-collision strength of the punctureneedle can be adjusted by adjusting the force of the pressure spring, and meanwhile, the force of the pressure spring can also achieve a certain degree of puncture function.

Description

technical field [0001] The invention relates to the technical field of accessories for detection equipment, in particular to a needle arm structure with anti-collision puncture function. Background technique [0002] A cantilever needle structure is often used in the IVD industry, which is mostly used in biochemical analyzers, immunochemiluminescence and other types of detection instruments. The commonly used anti-collision structures are cantilever anti-collision supports or double spring anti-collision supports. The anti-collision prevents the needle from being bent by misoperation. When the needle is ejected or pushed into the pre-designed sensor detection range, it is judged whether the needle has collided. The commonly used cantilever anti-collision support uses only one spring and uses The force center of the cantilever structure is not at the axis of the needle, which may cause the needle to collide with uneven force, unable to return to the original position and stuc...

AI Technical Summary

Problems solved by technology

[0005] Aiming at one of the above-mentioned problems, the present invention provides a needle arm structure with an anti-collision puncture function, which uses a puncture needle that passes through the sensor fixing seat, support plate, guide sleeve, and limit post in sequence, and a needle arm is provided between the guide sleeve and the puncture needle. There is a cavity for the compression spring. During the movement of the needle arm, when the lower end of the puncture needle hits a hard object, the limit column moves upward together with the puncture needle to compress the spring until the needle sensing plate on the puncture needle blocks the photoelectric switch sensing area. , the movement of the needle arm stops, preventing the puncture needle from colliding, which solves the technical problems in the prior art that the anti-collision strength of the puncture needle cannot be adjusted, and the spring used cannot recover the direction of movement.

Images