Automatic liquid sample injector for petroleum analytical instrument

Abstract

The invention discloses an automatic liquid sample injector for a petroleum analytical instrument. The automatic liquid sample injector comprises a stepper motor and a screw rod making linear motion along with the stepper motor. The screw rod is sheathed with a sliding block, the sliding block is sleeved on a guide rail, and the inner side of the sliding block is embedded with a magnet able to generate electromagnetic induction with a Hall element. The guide rail is equipped with a pair of Hall elements arbitrarily movable in position. The automatic liquid sample injector makes use of the Hall elements to control the position so as to make sample injection control more accurate and in-place, and is free of the problems of loss of synchronism and inaccurate positioning. Also adjustment of the Hall elements is convenient, so that positioning becomes very simple, and operation can be more convenient.

Description

technical field [0001] The invention belongs to the technical field of petroleum analysis instruments, in particular to an automatic liquid sampler for petroleum analysis instruments. Background technique [0002] In the petrochemical industry, it is necessary to analyze the components of oil and gas. When analyzing liquid oil tanks, most of the devices used for automatic sampling of samples are liquid samplers. At present, the liquid sampler adopts internal thread stepping When the motor, the stepper motor rotates, it drives the screw rod mounted on the internal thread to make a linear motion, and then pushes the syringe to inject samples. There are two problems with this type of injector: the first is that it is difficult to adjust the position; the second is that it is easy to lose step. Inaccurate injection or damage to the injection syringe after out-of-step. [0003] Although, Chinese patent CN201020540360.8 discloses a liquid-phase autosampler sampling device, includ...

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Problems solved by technology

[0002] In the petrochemical industry, it is necessary to analyze the components of oil and gas. When analyzing liquid oil tanks, most of the devices used for automatic sampling of samples are liquid samplers. At present, the liquid sampler adopts internal thread stepping When the motor, the stepper motor rotates, it drives the screw rod mounted on the internal thread to make a linear motion, and then pushes the syringe to inject samples. There are two problems with this type of injector: the first is that it is difficult to adjust the position; the second is that it is easy to lose step. Inaccurate injection or damage to the injection syringe after out-of-step

This technical solution still has complex structure and inconvenient control deficiencies

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