The working principle of LGBT molding machine


LGBT molding machineThe working principle

It is by means of the screw (or plunger) thrust, the plastic injection into the closed mold cavity, the process of obtaining the product after solidification. Injection molding is a cycle of technological process, each cycle mainly includes: quantitative feeding-melt plasticization-pressure injection-filling cooling-open mold parts. After taking out the plastic parts, the mold is closed again to enter the next cycle.

According to the plasticizing method, it is divided into plunger type LGBT molding machine and screw type LGBT molding machine. According to the transmission mode of the machine, it can be divided into hydraulic type, mechanical type and hydraulic-mechanical type (connecting rod type). According to the operation mode, it is divided into automatic, semi-automatic and manual LGBT molding machine.

This is the more common one. The clamping part and the injection part are on the same horizontal center line, and the mold is opened and closed in the horizontal direction. Its characteristics are: short body, convenient operation and maintenance; installation is more stable; after the product is ejected, it can automatically fall by gravity, which is easy to realize automatic operation. This type of LGBT molding machine is being used in the market.

The clamping part and the injection part are on the same vertical center line, and the mold is opened and closed in the vertical direction. Therefore, it occupies a small area, is easy to place inserts, is convenient to load and unload the mold, and the material can be uniformly plasticized when falling into the hopper. But the product is not easy to automatically fall after the top, must be removed by hand, not easy to achieve automatic operation. Vertical LGBT molding machine is suitable for smallLGBT molding machineGenerally, LGBT molding machines below 60g are used more, and large and medium-sized machines are not suitable for use.

Its injection direction is on the same curved surface as the mold interface, which is especially suitable for flat products where the machining center parts are not allowed to leave gate traces. It has a smaller footprint than the horizontal LGBT molding machine, but the insert mold is easy to tilt downward. This type of LGBT molding machine is suitable for small machines.

It is a special LGBT molding machine for multi-station operation. Its characteristic is that the clamping device adopts a turntable structure, and the mold rotates around the rotating shaft. This typeLGBT molding machineIt gives full play to the plasticizing ability of the injection device, can shorten the production cycle and improve the production capacity of the machine, so it is especially suitable for the production of large quantities of products with long cooling solidification time or more auxiliary time due to the placement of inserts. However, due to the large and complex clamping system, the clamping force of the clamping device is often small, so this LGBT molding machine is widely used in the production of plastic soles and other products.

The forming process requires different combinations of punches and dies. Different shapes need to replace different molds and corresponding clamping molds, and multiple shapes can be processed at the same time. Ensure that the mold is not loose; it is necessary to adjust the working speed of the main cylinder by setting a tubular throttle valve, and set a superimposed hydraulic control check valve on the pressure cylinder circuit. Each cylinder circuit is equipped with a superimposed two-way throttle valve, which can adjust the two-way movement speed of the clamping cylinder, the positioning cylinder and the rotary stamping cylinder. Through the cooperation of the moving cylinder and the positioning cylinder, the position transformation can be realized, so that the position transformation is more convenient and accurate, so as to ensure the processing quality of the pipe fittings.

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