Micro twin-screw mixing and extrusion experimental machine

Extruders are generally used for extruding plastic items through heating, which can be used for waste recycling or in conjunction with auxiliary equipment to produce products. The twin-screw extruders currently available on the market, connected to three-phase power sources, have large volumes ranging from 2 meters to 15 meters in size, and produce a wide variety of materials. During production, the noise level is relatively high, making it suitable for factory production.

In some special materials industries, in order to experiment or verify material properties, formulas, etc., it is necessary to use extruders to produce materials, such as pharmaceuticals, material mixing, fuel boosters, organic substances, etc. During experiments, the materials used are relatively expensive, some costing tens of thousands of yuan per kilogram. If too much material is added at a time, it will cause waste of materials. If too little material is added, it will not achieve the desired discharge effect. Currently, small extruders do not have the ability to perform low-dose mixing and extrusion.

Specifically, the material volume of the screw components in traditional small twin-screw mixing extruders is large, and small doses of materials cannot fill the space, making it impossible to achieve micro material extrusion. However, twin-screw extruders with smaller center to center distances have smaller groove depths, but they pose processing difficulties for plastic raw material particle sizes, making them difficult to feed and prone to jamming.

Provide a micro twin-screw mixing and extrusion experimental machine to solve the problems encountered in the background technology mentioned above.

A micro twin-screw mixing and extrusion experimental machine, comprising a driving device and a transmission box connected to the driving device. The interior of the transmission box is connected to A screw and B screw through multi-stage transmission components. The rotation direction of A screw is the same as that of B screw and the speed is the same. The driving device is a DC servo motor. The diameter of A screw and B screw is 12-16mm, and the center distance between A screw and B screw is 11-13mm.

As a preferred solution, in the above scheme, the diameter of both screw A and screw B is 14mm, and the center distance between screw A and screw B is 12mm.

In the above scheme, there are also several interconnected machine barrels. The front end of the machine barrel is connected to the output end of the transmission box, and the top of the machine barrel is equipped with a feeding hopper. The discharge end of the last end of the machine barrel is connected to a discharge mold.

In the above scheme, the outer side of the barrel is connected with a heating device and a cooling device.

In one embodiment, the transmission box comprises a box body and a box cover fixedly connected to the box body. The interior of the box body is equipped with a first stage transmission component, a second stage transmission component, and a third stage transmission component. The input end of the first stage transmission component is connected to the output end of the driving device, and the output end of the first stage transmission component is fixedly connected to the second stage transmission component. One side of the output end of the second stage transmission component is fixedly connected to the A screw, the other side of the output end of the second stage transmission component is connected to the third stage transmission component, and the output end of the third stage transmission component is fixedly connected to the B screw.

Furthermore, in the above scheme, the outer wall of screw A is equipped with a bearing outer ring connected to the transmission box through rolling elements, and the outer wall of screw B is equipped with a second bearing outer ring connected to the transmission box through rolling elements.

Furthermore, in the above scheme, the first stage transmission component, second stage transmission component, and third stage transmission component are all gear shaft transmission components, and the first stage transmission component, second stage transmission component, and third stage transmission component are respectively installed in the transmission box through bearings.

In addition, as a preferred solution, the ribs of screw A and screw B are installed alternately.

Compared with the existing technology, the beneficial effects of the present invention are that the driving device adopts a servo motor, which can be used in the laboratory. The diameter and center distance of screw A and screw B are both smaller than the industry minimum value, which can produce smaller particle size materials. This micro twin-screw mixing and extrusion experimental machine can be used for mixing and extrusion production, with a wide range of applications and can meet the needs of laboratory materials.