CN204844789U - Extruder bush of gradual change pitch -row - Google Patents

Abstract

The utility model discloses an extruder bush of gradual change pitch -row, including the bush body (1), bush distribution chamber (2), discharge opening (3), screw hole (4), the bush body (1) is including the middle part bush body (11) and two tip bush bodies (12), the pitch -row of the tip bush body (12) discharge opening (3) is middle part bush 2 times of (11) discharge opening (3) pitch -row physically. The utility model discloses a change the pitch -row of the bush body (1) different positions discharge opening (3), and then adjust the pressure of different discharge openings (3) interior material for discharge opening (3) pressure homogeneity is better, effectively prevents material strip thickness inequality, and the smooth implementation of production is guaranteed to " disconnected strip " even, and the unnecessary wearing and tearing are avoided to the die body that just can be geared to the needs of the job, increase bush body life.

Description

A kind of extruding dies of gradual change pitch-row

Technical field

The utility model relates to processing modified plastics technical field, especially a kind of extruding dies of gradual change pitch-row.

Background technology

Mouth mould is mounted in the apertured members of extruder end, is a vital link in modifying plastics equipment.In processing modified plastics field, plastic material first plastifies through extruding machine barrel, and mixing, plastifies mixed material and become molten from solid, the material of molten through screen pack and fishtail manifold the plastic pressure of molten is balanced.Plastic material is extruded into strip-shaped materials by last per os mould, and strip-shaped materials cools through tank, pelleter pelletizing and then be packaged into finished product.Although material is slightly balanced at pressure after filter screen and fish tail shape head, but still it is little to there is pressure at two ends, the situation that intermediate pressure is large.

As shown in Figure 1, existing die geometry is channel-shaped structure, and its side is connected with cross-head, and its inside is provided with in the same size, the uniform hole of pitch-row, and melted material from the same size, will be extruded into material strip in the hole of uniform pore diameter.Though the consistent mouth of pitch-row is molded makes that to add man-hour simple and convenient, but to pressure distribution difference problem without any Compensation measures, so hole, mouth mould middle part material pressure is comparatively large, two stomidium material pressures are less.The discharge opening material pressure nearer from mouth mould vertical axis is larger, from vertical axis more away from discharge opening material pressure less.When processing materials poor fluidity, this phenomenon is particularly evident.Open defect is there is because this kind of situation causes in use procedure:

1, material strip thickness is uneven, time serious " disconnected bar ".Because interstitial hole pressure is comparatively large, pressure at two ends is less, and the hole that during production, intermediate pressure is larger goes out material strip diameter and is obviously greater than the material strip that aperture that on limit, pressure is less goes out.Thus cause that to extrude material strip thickness uneven, when material strip pressure on limit little to a certain extent after discharging cut in and out, can not continuous discharge bar, be commonly called as " break bar ";

2, the mouth mould rate of wear is very fast.Because interstitial hole pressure is large, two stomidium pressure are less, are greater than two stomidiums from interstitial hole institute extruded material, the hole that the hole rate of wear that centre position, position pressure is larger is obviously less faster than pressure at two ends.Mouth mould use a period of time mouth two stomidium normal and interstitial hole wearing and tearing to reach the upper limit, need to change whole mouth mould.

Utility model content

The utility model proposes a kind of extruding dies of gradual change pitch-row, solve the problem that existing extruder material strip thickness is uneven and the mouth mould rate of wear is fast.

The technical solution of the utility model is achieved in that

The utility model provides a kind of extruding dies of gradual change pitch-row, comprise a mouthful die body, mouth mould distribution cavity, discharge opening, screw hole, described mouth die body comprises middle part mouth die body and two end mouth die bodys, described middle part mouth die body is uniformly distributed some discharge openings, described end mouth die body is uniformly distributed some discharge openings, and the pitch-row of described end mouth die body discharge opening is 2 times of middle part mouth die body discharge opening pitch-row.

As preferably, the pitch-row of described end mouth die body discharge opening is 1.5 times of middle part mouth die body discharge opening pitch-row.

As preferably, the pitch-row of described end mouth die body discharge opening is 3 times of middle part mouth die body discharge opening pitch-row.

As preferably, described mouth die body is formed in one structure.

The beneficial effect of the utility model embodiment is: the utility model is by changing the pitch-row of mouth die body diverse location discharge opening, and then adjust the pressure of material in the discharge opening of axially different position, make discharge opening pressure uniformity better, effectively prevent material strip thickness uneven, even " disconnected bar ", ensure the smooth enforcement of producing, and unnecessary wearing and tearing can be avoided by counterpart die body, increase mouth die body service life.

Accompanying drawing explanation

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the structural representation of prior art;

The embodiment schematic diagram of the gradual change hole extruder distance mouth mould that Fig. 2 provides for the utility model;

The sectional view of the gradual change hole extruder distance mouth mould that Fig. 3 provides for the utility model.

In figure, 1-mouth die body; Mouth die body in the middle part of 11-; 12-end mouth die body; 2-mouth mould distribution cavity; 3-discharge opening; 4-screw hole.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

The extruding dies of a kind of gradual change pitch-row as shown in Figure 2 and Figure 3, comprise mouthful die body 1, mouth mould distribution cavity 2, discharge opening 3, screw hole 4, mouth die body 1 comprises middle part mouth die body 11 and two end mouth die bodys 12, middle part mouth die body 11 and end mouth die body 12 are uniformly distributed some discharge openings 3, the pitch-row of end mouth die body 12 discharge opening 3 is 2 times of middle part mouth die body 11 discharge opening 3 pitch-row, the adjustment of pitch-row, make the number change of discharge opening 3 in different parts mouth die body 1 unit length, and then adjust the pressure of material in different discharge opening 3.Middle part mouth die body 11 pitch-row is less, and in unit length, discharge opening 3 quantity is fewer, and in discharge opening 3, pressure diminishes; Otherwise end mouth die body 12 pitch-row is larger, and in unit length, discharge opening 3 quantity is fewer, in its hole, material pressure becomes large.Thus make diverse location discharge opening 3 pressure more tend to even, due to shaping isostasy, material strip even thickness, particle outward appearance is more even, avoids occurring " disconnected bar " phenomenon, and according to produced material fluidity, can design corresponding pitch-row.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims (4)

1. the extruding dies of a gradual change pitch-row, comprise a mouthful die body (1), mouth mould distribution cavity (2), discharge opening (3), screw hole (4), it is characterized in that: described mouth die body (1) comprises middle part mouth die body (11) and two ends mouth die body (12), described middle part mouth die body (11) is uniformly distributed some discharge openings (3), described end mouth die body (12) is uniformly distributed some discharge openings (3), the pitch-row of described end mouth die body (12) discharge opening (3) is 2 times of middle part mouth die body (11) discharge opening (3) pitch-row.

2. the extruding dies of a kind of gradual change pitch-row according to claim 1, is characterized in that: the pitch-row of described end mouth die body (12) discharge opening (3) is 1.5 times of middle part mouth die body (11) discharge opening (3) pitch-row.

3. the extruding dies of a kind of gradual change pitch-row according to claim 1, is characterized in that: the pitch-row of described end mouth die body (12) discharge opening (3) is 3 times of middle part mouth die body (11) discharge opening (3) pitch-row.

4. the extruding dies of a kind of gradual change pitch-row according to claim 1, is characterized in that: described mouth die body (1) is formed in one structure.