Adjustable quantitative injection pump

Abstract

The invention relates to an adjustable quantitative injection pump. A speed reduction motor is arranged on a pump body. A rotating block is fixed on an output shaft of the speed reduction motor. An adjusting screw rod vertical to the output shaft of the speed reduction motor is arranged on the rotating block. A sliding block drive pin is arranged on the adjusting screw rod. The axis of the sliding block drive pin is deviated from the axis of the output shaft of the speed reduction motor. The sliding block drive pin is matched in a transverse groove of a sliding block in a sliding mode. The sliding block is matched on a vertical sliding block guide rod in a sliding mode. A vertical drive rod is fixed on the sliding block. The drive rod is connected with a push rod of a syringe through a linkage block. According to the invention, a transmission mechanism of the syringe is formed by the speed reduction motor, the rotating block, the sliding block drive pin, the sliding block and the drive rod and drives the push rod of the syringe to take the piston motion, wherein the sliding block drive pin is arranged on the adjusting screw rod and the eccentricity of the sliding block drive pin relative to the output shaft of the speed reduction motor can be regulated, so that the output of the syringe is regulated. The adjustable quantitative injection pump has simple structure and low cost, is stably and reliable to operate and is simple and convenient to control.

Description

technical field [0001] The invention relates to a syringe pump for sampling water samples in a water quality on-line automatic monitoring device, in particular to an adjustable quantitative syringe pump. Background technique [0002] In the existing water quality on-line automatic monitoring device, three types of water samples are mainly used for sampling water samples: micro-injection pumps, industrial injection pumps and peristaltic pumps. [0003] The micro syringe pump mainly realizes liquid suction and discharge through the diaphragm and plunger, but the displacement of the pump is fixed, and it is impossible to change the pump volume on one pump. If you want to change the pump volume, you need to replace it with a new pump. , and the cost is high, and it is difficult to meet the needs of use in some occasions that require multiple injections without interfering with each other. [0004] Most industrial syringe pumps use motor components and the propulsion mechanism c...

AI Technical Summary

Problems solved by technology

[0003] The micro syringe pump mainly realizes liquid suction and discharge through the diaphragm and plunger, but the displacement of the pump is fixed, and it is impossible to change the pump volume on one pump. If you want to change the pump volume, you need to replace it with a new pump. , and the cost is high, it is difficult to meet the needs of use in some occasions that require multiple injections without interfering with each other

[0004] Most industrial syringe pumps use motor components and the propulsion mechanism connected with the syringe to work through gear transmission. Due to the complex structure, the injection pipeline is easy to cause pollution and is difficult to clean. If the injection system sucks Air is introduced into the bubble residual tube, which is generally difficult to completely eliminate, resulting in inaccurate sample injection, large volume, troublesome control, etc.

[0005] The peristaltic pump achieves pumping liquid by alternately squeezing and releasing the elastic delivery hose of the pump. Since the hose is constantly squeezed, the service life of the hose is relatively short, and the degree of compression of the hose will cause further damage. The change of sample volume makes the sampling accuracy of peristaltic pump not as good as that of syringe pump

Images