Mixing head capable of adding fiber material and adding method

Abstract

The invention discloses a mixing head capable of adding fiber materials and an adding method, comprising a large piston cylinder, a small piston cylinder, a large piston located in the large piston cylinder, a small piston located in the small piston cylinder, the large piston cylinder and the small piston The cylinder communicates with the mixing chamber, the large piston is provided with a fiber channel communicating with the mixing chamber, and the end of the large piston facing the direction of the mixing chamber is provided with an annular depression, and the annular depression is in the shape of a straight cylinder, and The outer diameter of the annular depression is smaller than the outer diameter of the large piston; the bottom of the mixing chamber is connected to a bulk material pan, and the inner wall of the bulk material pan is provided with several annular air outlets uniformly distributed. The invention provides a mixing head capable of adding fiber materials to solve the above-mentioned problems in the prior art, realize the purpose of preventing the fiber materials from being difficult to go down normally due to fluid pressure, and ensuring the smooth mixing of fiber materials and raw materials.

Description

technical field [0001] The invention relates to the field of plastic production equipment, in particular to a mixing head capable of adding fiber materials and an adding method. Background technique [0002] In the foaming or injection molding process of some plastic products, adding fiber materials can effectively improve the physical and chemical properties of the product, but where and how to add fiber materials has always been a technical problem in this field. In the prior art, CN102341224A discloses "equipment for manufacturing plastic parts mixed with reinforcing fibers", which is provided with an annular groove on the outer wall of the cleaning piston, and a number of nozzle passages are arranged in the annular groove to communicate with the mixing chamber to realize the Mixing of fibers and raw materials. However, the applicant of this case found in a large amount of research that the prior art represented by CN102341224A has many defects in specific use: (1) The n...

AI Technical Summary

Problems solved by technology

However, the applicant of this case found in a large amount of research that the prior art represented by CN102341224A has many defects in specific use: (1) The nozzle passage of the prior art is inclined downward and communicates with the mixing chamber, and several strands of raw materials are mixed Convergence at the center of the cavity, due to the high injection pressure of raw materials, a local high-pressure fluid "cap" will be formed at the confluence of several strands of raw material, and it is difficult to break through the pressure at the "cap" due to the extremely light weight of the added fiber material , so it is easy to cause the fiber material to directly accumulate on the "cap" where the raw material gathers and cannot go down normally; this phenomenon is especially obvious when the raw material discharge is large or the fiber addition is large: it has been proved by the applicant's experiment in this case that when the raw material discharge In the case of a large amount or a large amount of fiber addition, the fiber material will even quickly accumulate in the fiber conveying channel inside the cleaning piston, resulting in the failure of the fiber material to be mixed according to the set ratio, and even overflowing in severe cases (2) in the prior art, the raw material enters the mixing chamber along several nozzle passages, and it is difficult to mix with the fibers uniformly along the circumferential direction; and because the nozzle passage is the descending passage of the raw material, the raw material remaining in the nozzle passage It is easy to foam or react in it. Once the raw material is formed, it will partially or completely block the nozzle channel. Due to the structural design and size limitations of the nozzle channel, it is impossible to clean it effectively. In severe cases, it will even directly lead to the cleaning piston. scrapped

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