CN215396795U - Screw rod with good extrusion effect - Google Patents

Abstract

The utility model discloses a screw with good extrusion effect, which comprises a screw main body, wherein the screw main body is sequentially provided with a connecting section, an initial section, a first extrusion section and a second extrusion section from right to left; the first extrusion section is provided with first threads, and the second extrusion section is provided with second threads; the pitch of the first threads of the first extrusion section is gradually reduced from right to left; the pitch of the second threads of the second extrusion section is unchanged and is equal to the pitch of the first threads at the left end of the first extrusion section; the bottom diameters of the first extrusion section and the second extrusion section are arranged to be gradually reduced from right to left; and the left end of the screw rod main body is a convex curved surface. So, first extrusion section on the screw rod sets up the first screw thread that the pitch reduces gradually from the right side to left side for plastics can be organized compaction mixing propelling movement gradually, and the second screw thread that sets up the pitch such as in second extrusion section can stabilize the compaction effect of plastics, improves off-the-shelf injection quality.

Description

Screw rod with good extrusion effect

Technical Field

The utility model relates to the technical field of screws for injection molding machines, in particular to a screw with a good extrusion effect.

Background

The screw is an important part of an injection molding machine and functions to convey, compact, melt, stir and apply pressure to the plastic. There are a variety of screws available on the market that allow manufacturers to select screws according to different needs; but the existing screw rod does not well give consideration to the production convenience of the screw rod and the compaction and mixing effect of the screw rod on plastics.

Therefore, a new technical solution is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to the defects in the prior art, and a main object of the present invention is to provide a screw rod with a good extrusion effect, in which a first extrusion section on the screw rod is provided with a first thread with a pitch gradually decreasing from right to left, so that plastics can be gradually compacted, mixed and pushed, and a second extrusion section is provided with a second thread with an equal pitch, so that the compaction effect of plastics can be stabilized, and the injection quality of a finished product can be improved.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a screw rod with a good extrusion effect comprises a screw rod main body, wherein the screw rod main body is sequentially provided with a connecting section, an initial section, a first extrusion section and a second extrusion section from right to left; the first extrusion section is provided with first threads, and the second extrusion section is provided with second threads; wherein:

the pitch of the first threads of the first extrusion section is gradually reduced from right to left; the pitch of the second threads of the second extrusion section is unchanged and is equal to the pitch of the first threads at the left end of the first extrusion section;

the bottom diameters of the first extrusion section and the second extrusion section are arranged to be gradually reduced from right to left; and the left end of the screw rod main body is a convex curved surface.

Preferably, the second extrusion section is further provided with a third thread, the outer diameter of the third thread is smaller than the outer diameters of the first thread and the second thread, and the outer diameters of the first thread and the second thread are the same.

Preferably, the pitch of the third thread is greater than the pitch of the second thread.

As a preferable scheme, the first thread is provided with an arc transition surface connected with the outer diameter surface of the first extrusion section; and the second thread and the third thread are both provided with arc transition surfaces connected to the outer diameter surface of the second extrusion section.

Preferably, the left sides of the threads of the first thread, the second thread and the third thread are connected with the outer diameter surface of the screw body at a negative angle.

Preferably, the pitch of the first threads of the first extrusion section is uniformly and gradually reduced from right to left.

Preferably, the surfaces of the initial section, the first extrusion section and the second extrusion section are plated with metal protective layers.

Preferably, the screw body is made of pre-hardened steel with a hardness of 38-42 HRC.

As a preferred aspect, the overall length of the screw body is 860mm, wherein: the length of the connecting section is 210mm, the length of the starting section is 50mm, the length of the first extrusion section is 390mm, and the length of the second extrusion section is 210 mm; the pitch of the first threads gradually changes from 45mm at the right end to 65mm, the pitch of the second threads is 45mm, and the pitch of the third threads is 52 mm.

As a preferred scheme, the screw body comprises a first rod body and a second rod body which are assembled in a split manner, the connecting section is formed on the first rod body, and the starting section, the first extrusion section and the second extrusion section are arranged on the second rod body;

an inner threaded hole extending along the axial direction of the second rod body is formed in the second rod body, an outer threaded section extends along the axial direction of the first rod body, and the outer threaded section extends into the inner threaded hole to form threaded connection; the material strength of the first rod body is greater than that of the second rod body; the external thread section at least extends into the first extrusion section.

Compared with the prior art, the plastic injection molding device has the obvious advantages and beneficial effects, and particularly, according to the technical scheme, the screw is mainly designed, the first extrusion section on the screw is provided with the first threads with the gradually-reduced thread pitch from right to left, so that plastics can be gradually compacted, mixed and pushed, and the second extrusion section is provided with the second threads with the equal thread pitch, so that the compaction effect of the plastics can be stabilized, and the injection molding quality of a finished product can be improved;

secondly, the second extrusion section is provided with third threads with equal pitch, so that the compaction effect can be further stably and effectively improved, and the mixing effect of plastics is improved;

thirdly, the screw threads of all the threads and the outer diameter of the screw body are in smooth transition, so that the smoothness of plastic propulsion is ensured;

the screw body comprises the first rod body and the second rod body which are assembled in a split mode, so that the strength requirements of different sections can be met, and the durability of the whole screw body is improved; meanwhile, the two parts can be assembled in a split mode, different screw rod main bodies can be assembled according to requirements, and follow-up maintenance and replacement are very convenient.

To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Drawings

FIG. 1 is a front view of a first embodiment of the present invention;

FIG. 2 is a partial cross-sectional view taken at N-N of FIG. 1;

FIG. 3 is a partial cross-sectional view taken at A-A of FIG. 1;

FIG. 4 is a partial cross-sectional view taken at D-D of FIG. 1;

FIG. 5 is a partial cross-sectional view taken at B-B of FIG. 1

FIG. 6 is an enlarged view of a portion of FIG. 1 at I;

FIG. 7 is a partial cross-sectional view taken at K in FIG. 1;

FIG. 8 is a partial cross-sectional view taken at P in FIG. 1;

FIG. 9 is a schematic diagram of a second embodiment of the present invention;

fig. 10 is an exploded view of a second embodiment of the present invention.

The attached drawings indicate the following:

10. connection section 20, start section

22. Third thread 30, first extrusion section

31. First thread 40, second extrusion section

41. Second screw thread 42, third screw thread

101. A first rod 102 and a second rod.

Detailed Description

Referring to fig. 1 to 10, specific structures of embodiments of the present invention are shown.

A screw rod with good extrusion effect comprises a screw rod main body, wherein the screw rod main body is sequentially provided with a connecting section 10, an initial section 20, a first extrusion section 30 and a second extrusion section 40 from right to left; the first extrusion section 30 is provided with a first thread 31, and the second extrusion section 40 is provided with a second thread 41; wherein:

the pitch of the first threads 31 of the first extrusion section 30 is gradually reduced from right to left; the pitch of the second screw thread 41 of the second extrusion section 40 is constant and equal to the pitch of the first screw thread 31 at the left end of the first extrusion section 30;

the bottom diameters of the first extrusion section 30 and the second extrusion section 40 are arranged to be gradually reduced from right to left; and the left end of the screw rod main body is a convex curved surface. Therefore, the first thread 31 with the gradually reduced pitch from right to left is arranged on the first extrusion section 10 on the screw rod, so that the plastic can be gradually compacted, mixed and pushed, and the second thread 41 with the equal pitch is arranged on the second extrusion section 20, so that the compaction effect of the plastic can be stabilized, and the injection molding quality of a finished product is improved;

further, the second extruding section 40 is further provided with a third thread 42, the outer diameter of the third thread 42 is smaller than the outer diameters of the first thread 31 and the second thread 41, and the outer diameters of the first thread 31 and the second thread 41 are the same.

Preferably, the pitch of the third thread 42 is greater than the pitch of the second thread 41.

Furthermore, the first thread 31 is provided with an arc transition surface connected with the outer diameter surface of the first extrusion section 30; the second thread 41 and the third thread 42 are provided with arc transition surfaces respectively and connected to the outer diameter surface of the second extrusion section 40. Preferably, the left sides of the first thread 31, the second thread 41 and the third thread 42 are connected with the outer diameter surface of the screw body at a negative angle. Specifically, in the present embodiment, the left sides of the threads of the first thread 31, the second thread 41, and the third thread 42 are connected with the outer diameter surface of the screw body at minus 5 degrees, see fig. 6 and 7.

Preferably, the pitch of the first thread 31 of the first extrusion section 30 is uniformly and gradually reduced from right to left, so that certain extrusion fluency is ensured.

Further, the method comprises the following steps: the surfaces of the initial section 20, the first extrusion section 30 and the second extrusion section 40 are plated with metal protective layers.

This embodiment also discloses when using, the concrete size of screw rod main part, its overall length is 860mm, wherein: the length of the connecting section 10 is 210mm, the length of the starting section 20 is 50mm, the length of the first extrusion section 30 is 390mm, and the length of the second extrusion section 40 is 210 mm; the pitch of the first threads 31 is gradually changed from 45mm to 65mm from the right end, the pitch of the second threads 41 is 45mm, and the pitch of the third threads 42 is 52 mm.

Preferably, the screw body may be made of pre-hardened steel having a hardness of 38-42 HRC. Of course, as shown in fig. 9 and 10, the screw body may also include a first rod 101 and a second rod 102 which are separately assembled, the connecting section 10 is formed on the first rod 101, and the starting section 20, the first extruding section 30, and the second extruding section 40 are disposed on the second rod 102;

an internal threaded hole extending along the axial direction of the second rod body 102 is formed in the second rod body 102, an external threaded section extends along the axial direction of the first rod body 101, and the external threaded section extends into the internal threaded hole to form threaded connection; the material strength of the first rod body 101 is greater than that of the second rod body 102; the external threaded section extends at least into the interior of the first extrusion section 30. Generally, the spiral direction in which the first rod 101 is fitted into the second rod 102 is the same as the spiral direction in the case of the entire screw. Therefore, the screw main body comprises the first rod body 101 and the second rod body 102 which are assembled in a split mode, so that the strength requirements of different sections can be met, and the durability of the whole screw main body is improved; meanwhile, the two parts can be assembled in a split way, different screw rod main bodies can be assembled according to requirements, and the follow-up maintenance and replacement are very convenient

The design of the utility model is mainly characterized in that the screw is designed, a first thread with the tooth pitch gradually reduced from right to left is arranged on a first extrusion section on the screw, so that the plastic can be gradually compacted, mixed and pushed, and a second thread with the same tooth pitch is arranged on a second extrusion section, so that the compaction effect of the plastic can be stabilized, and the injection molding quality of a finished product is improved;

secondly, the second extrusion section is provided with third threads with equal pitch, so that the compaction effect can be further stably and effectively improved, and the mixing effect of plastics is improved;

thirdly, the screw threads of all the threads and the outer diameter of the screw body are in smooth transition, so that the smoothness of plastic propulsion is ensured;

the screw body comprises the first rod body and the second rod body which are assembled in a split mode, so that the strength requirements of different sections can be met, and the durability of the whole screw body is improved; meanwhile, the two parts can be assembled in a split mode, different screw rod main bodies can be assembled according to requirements, and follow-up maintenance and replacement are very convenient.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.

Claims (10)

1. The utility model provides an effectual screw rod of extrusion which characterized in that: the screw rod comprises a screw rod main body, wherein the screw rod main body is sequentially provided with a connecting section, an initial section, a first extrusion section and a second extrusion section from right to left; the first extrusion section is provided with first threads, and the second extrusion section is provided with second threads; wherein:

the pitch of the first threads of the first extrusion section is gradually reduced from right to left; the pitch of the second threads of the second extrusion section is unchanged and is equal to the pitch of the first threads at the left end of the first extrusion section;

the bottom diameters of the first extrusion section and the second extrusion section are arranged to be gradually reduced from right to left; and the left end of the screw rod main body is a convex curved surface.

2. The screw rod with good extrusion effect according to claim 1, characterized in that: the second extrusion section is further provided with a third thread, the outer diameter of the third thread is smaller than that of the first thread and that of the second thread, and the outer diameters of the first thread and the second thread are the same.

3. The screw rod with good extrusion effect according to claim 2, characterized in that: the pitch of the third thread is greater than the pitch of the second thread.

4. The screw rod with good extrusion effect according to claim 2, characterized in that: the first thread is provided with an arc transition surface connected with the outer diameter surface of the first extrusion section; and the second thread and the third thread are both provided with arc transition surfaces connected to the outer diameter surface of the second extrusion section.

5. The screw rod with good extrusion effect according to claim 4, characterized in that: the left sides of the threads of the first thread, the second thread and the third thread are connected with the outer diameter surface of the screw rod main body at a negative angle.

6. The screw rod with good extrusion effect according to claim 1, characterized in that: the pitch of the first threads of the first extrusion section is uniformly and gradually reduced from right to left.

7. The screw rod with good extrusion effect according to claim 1, characterized in that: and metal protective layers are electroplated on the surfaces of the starting section, the first extrusion section and the second extrusion section.

8. The screw rod with good extrusion effect according to claim 1, characterized in that: the screw body is made of pre-hardened steel, and the hardness of the screw body is 38-42 HRC.

9. The screw rod with good extrusion effect according to claim 2, characterized in that: the total length of the screw body is 860mm, wherein: the length of the connecting section is 210mm, the length of the starting section is 50mm, the length of the first extrusion section is 390mm, and the length of the second extrusion section is 210 mm; the pitch of the first threads gradually changes from 45mm at the right end to 65mm, the pitch of the second threads is 45mm, and the pitch of the third threads is 52 mm.

10. The screw rod with good extrusion effect according to claim 1, characterized in that: the screw rod main body comprises a first rod body and a second rod body which are assembled in a split mode, the connecting section is formed on the first rod body, and the starting section, the first extrusion section and the second extrusion section are arranged on the second rod body;

an inner threaded hole extending along the axial direction of the second rod body is formed in the second rod body, an outer threaded section extends along the axial direction of the first rod body, and the outer threaded section extends into the inner threaded hole to form threaded connection; the material strength of the first rod body is greater than that of the second rod body; the external thread section at least extends into the first extrusion section.

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