​Analysis of Technical Difficulties in the Development of Vacuum glass lifter

Analysis of Technical Difficulties in the Development of Vacuum glass lifter
 No matter what kind of equipment research and development will encounter different degrees of difficulties, in the process of vacuum chuck research and development, there are also technical difficulties. How to solve these difficulties? Let's take a look at it.           

In order to solve the problem of energy consumption and working performance of vacuum suction cup, a general technical scheme of vacuum suction cup, a self-regulating flow jet vacuum device, is proposed. Vacuum device-vacuum suction cup can quickly respond to the establishment of a set vacuum; in the vacuum maintenance stage, the air flow rate of vacuum device-vacuum suction cup can be adjusted by controlling the distance of adjustable cone entering the nozzle throat.           
 Previous experimental studies have preliminarily confirmed the effectiveness of the technical scheme. When the adjustable cone is adjusted, the flow rate of air supply can be reduced. At the same time, it is found that the vacuum  maintaining degree of vacuum device - vacuum suction cup will also decrease. Therefore, in order to ensure that the vacuum device - vacuum glass lifter can maintain the vacuum required for normal operation and achieve the maximum  energy-saving effect, it is necessary to determine a reasonable adjustable cone adjustment strategy, which requires accurate analysis of the adjustable cone adjustment process and the force on the adjustable cone.           
 In fact, the shape and area of the throat of the vacuum suction cup nozzle are changed. The flow process involves two stages: subsonic and supersonic. In addition, the flow is two-dimensional and complex in the case of variable cross-section. Therefore, using the traditional one-dimensional centralized model analysis method cannot give accurate velocity distribution, pressure distribution, energy loss and other information of fluid flow in vacuum device-vacuum suction cup, so it is impossible to design and control the adjustable cone components correctly. This is a difficulty in the development of vacuum device-vacuum suction cup. Question. In order to carry out more respectful numerical analysis, it is necessary to design the structure of vacuum device - vacuum glass lifter and to adjust the adjustable cone reasonably.           
 Flow Regulation Principle Using Adjustable Cone           
 The vacuum suction cup, a common jet vacuum device, is mainly composed of a Laval nozzle, an ejected cavity and a mixing tube, which shrinks first and then expands. When the ratio of supply pressure to throat pressure of nozzle is larger than a certain value, the supply gas accelerates to form supersonic jet  in Laval nozzle, and the ejected fluid is entrained into the mixing chamber under the shear action of supersonic jet, and then forms a single uniform  mixing fluid, which is decelerated and compressed to a certain back pressure through the second throat tube and diffusion chamber. Discharge vacuum device - vacuum glass lifter. In the process of mixing, the interaction between shock system and boundary layer makes the flow structure very complex, and the physical phenomena such as viscous interference make the theoretical description of the flow state of gas in vacuum device-vacuum suction cup very complicated.