Hot runner technology is used in plastic injection mold runner system's advanced technology

Hot runner technology is used in plastic injection mold runner system and advanced technologies. Hot runner nozzle extension from the initial order to shorten the main channel in the form of a plastic surface condensation to use a thermal insulation principle, development become extinct hot runner nozzles and pit adiabatic nozzle and other forms. These forms , although , compared with the normal flow channel system each have advantages , but there are still some deficiencies are especially easy to salivation for some plastic materials ( such as nylon , etc. ) can not be applied better . With the advances in microelectronics technology , as well as mold temperature control machine development and use , to the hot runner temperature control and mold cooling to arbitrary control ,  Instrumentation ball valve  technology to advance to a new stage of development. Hot runner nozzle according to the different structure of the system can be divided into open and the valve gate nozzle nozzle . For valve nozzle has a variety of  2 way manifold  abroad , but domestic targeted research in this area is also very little. Based on this situation , the paper and its hot runner nozzle needle injection mold applications are discussed. 2 needle nozzle working principle and characteristics of needle-type nozzle is in the traditional open gate in the installation of the valve needle moves quickly to control opening and closing of the nozzle and cavity filling process .

For the current production of large molds repair mode more often, gate selection is unreasonable, long molding cycle parts

Currently, the traditional large-scale injection mold design no basis in theory, lead to its presence in the design and manufacture of a series of problems encountered in the process. For example gating system balance workpiece warpage, cooling not guarantee the quality, weld lines and air pockets and so on. Taking a front bumper injection mold design, for example, by summarizing a large injection mold design principles and  Stainless steel needle valve  for the current production of large molds repair mode more often, gate selection is unreasonable, parts molding cycle is long, the number of cavitation more and molding defects such as weld lines, the use of  2 way manifold  software PRO / E for the car bumper design and mold flow analysis software application for car bumper parts for injection molding process optimization. In this paper, the following work on the bumpers of large injection mold for molding parameters gating system design and optimization.

Mixed gas pressure control valve

Regulating valve is a fluid transfer control system is an important component in the fluid pipeline , the rational use of the media regulating valve for regulating the flow rate , pressure and other parameters for effective control, and control fluid pulsation , to reduce energy consumption and improve energy efficiency has is of great significance . Valve is widely used in chemical, petroleum, metallurgy,  Instrumentation ball valve , light , water , marine and aerospace industries , along with industrial development, pipeline fluid flow toward larger , higher pressure in the direction of flow regulation so big valve applications more widely. Mills use mixed gas for gas - steam combined cycle power generation projects,  Stainless steel needle valve , the mixed gas flow requirements up 54000Nm3 / h or more, for the mixed gas pressure control valve nominal diameter exceeding 200mm. Large flow of mixed gas regulator control is the key steel cycle power  2 way manifold  technical problems . Usually regular preventive maintenance of the means to ensure high flow control valve job security and reliability , but preventive maintenance there is a " maintenance of excess " problem , resulting in high maintenance costs , resulting in reduced reliability , the failure rate increased ;

Reasonable spool streamlined design is to reduce the axial flow valve performance, and these flow regimes effective way to improve the flow capacity

Axial flow check valve for its smooth operation, water hammer pressure is small , easy to cavitation , the medium pressure changes fast response, low noise and good sealing , etc., are widely used in oil and gas gathering pipeline network and other pump outlet Fire and petrochemical pipes for the non-return devices. Axial flow valve spool to its linear structure is reasonable flow resistance coefficient , pressure loss, boundary layer separation flow pattern greatly affect its performance , sleek design and reasonable spool axial flow check valve is to reduce these flow  High pressure ball valve  and improved flow capacity and effective way. The design method of the previous valve passages are usually small change in slope of the straight line and the curve of a linear combination , the valve flow patterns  Trunnion ball valve  its performance . The paper -based sources and sinks France and precise method of mathematical expressions , presents a check valve spool axial  2 way manifold  design. Linear design methods valve design uses source-sink method . Source-sink method is the zero flow line style design, the design of this method over the fluid flow channel has a smaller flow resistance , and the boundary layer easily separated , the valve meet the movement of fluids , but not all of the sources and sinks France are suitable for linear valve design .