Design of chained pneumatic punching automatic dried jujube pit removing machine

KANG Ningbo 1 SHANG Mengyu2 HE Jianguo3 LIU Guishan3 WANG Songlei3 WU Longguo

(1.School of Construction and Hydraulic Engineering, Ningxia University, Yinchuan, China 750021)
(2.School of Physics and Electronic-Electrical Engineering, Ningxia University, Yinchuan, China 750021)
(3.School of Agriculture, Ningxia University, Yinchuan, China 750021)

【Abstract】Jujube pit removing is the key technology of dried jujube deep processing. Currently, it is very common that the dried jujube pit extractor has a lot of defects. We designed a chained pneumatic punching automatic dried jujube pit removing machine to solve the existing technical problems. The whole machine was composed of a chain roller for feeding, a camera for collecting the images of jujubes transmitted on the conveyor, locating mechanism, and a jujube pit mechanism with spinning inserting rod driven by an intermittent cylinder. All of them were controlled by an embedded microchip. The feeding mechanism was mainly supported by a roller conveyor chain. The locating mechanism worked in conjunction with the feeding mechanism. The lower conveyor chain of the feeding mechanism and the upper roller of the locating mechanism consisted of a synchronous clamping and a locating roller device. The dried jujube pit removing machine was made up of a magnetic valve, a driving damping cylinder, sets of rotary inserted rods and knockout rods, a speed-regulating rotary driving motor, a sliding table, and an air compressor. The embedded microchip controlling the whole jujube pit removing system was formed by a STM32F407 image processor, a STM32F103 coprocessor, a Shanghai LJ12A3-4-Z/BX 3-way NPN sensor and a HBS860H stepper motor. The whole structure could be divided into three parts according to the operating process, which included the jujube feeding area, the detecting area, and the clamping and jujube pit removing area. Under the programmatic control of the microcontroller, the jujubes were transported by the chain roller. The elastic strip was fixed at the bottom of the feeding hopper, and the rubbing roller rotated to realize the individual directional arrangement of the jujube. The camera was adopted for image detection of the automatic alignment of the jujubes, and the col