CN109849300B - Screw of injection molding machine - Google Patents

Abstract

The present invention provides a screw rod for an injection molding machine, belonging to the technical field of screw rod manufacturing equipment. It solves the problem that the entire screw rod is wasted after being worn out, and the present invention includes a screw rod body, which includes a detachably connected feeding section, a compression section and a homogenizing section, a first boss is provided in the middle of the homogenizing section, an external thread is provided on the first boss, an extension rod is also vertically provided on the first boss, one end of the extension rod is fixedly connected to the first boss, and a thread is provided on the other end, the compression section includes a first end head and a second end head, the first end head of the compression section is provided with a first cylindrical opening, the compression section is provided with a second boss, a first cavity is provided on the compression section, the extension rod on the first boss can extend out of the first cavity and be threadedly connected to the feeding section, the connecting end of the feeding section is provided with a second cylindrical opening matched with the second boss, and the feeding section is also provided with a screw hole matched with the thread on the extension rod. The present invention is detachable, simple in structure, and easy to use.

Description

An injection molding machine screw

Technical Field

The invention belongs to the technical field of screw manufacturing equipment, and in particular relates to a screw for an injection molding machine.

Background Art

The screw is an important part of the injection molding machine. Its function is to transport, compact, melt, stir and pressurize the plastic. All of these are accomplished by the rotation of the screw in the barrel. When the screw rotates, the plastic will produce friction and mutual movement against the inner wall of the barrel, the bottom surface of the screw groove, the propulsion surface of the screw ridges, and between the plastics. The forward propulsion of the plastic is the result of this combination of movements, and the heat generated by the friction is also absorbed to increase the temperature of the plastic and melt the plastic. The screw is divided into a feeding section, a compression section and a homogenizing section. Each section is very easy to wear, especially the homogenizing section of the screw, which is the most severely worn and the fastest worn of the three sections. If it is a whole screw, if one part is worn, the whole screw will be scrapped, resulting in great waste. Therefore, it is necessary to propose a wear-resistant and detachable injection molding machine screw.

Summary of the invention

The purpose of the present invention is to solve the above problems existing in the existing screw rods and to provide a detachable injection molding machine screw rod with good wear resistance.

The purpose of the present invention can be achieved by the following technical solutions:

A screw for an injection molding machine, characterized in that it includes a screw body, the screw body includes a detachably connected feeding section, a compression section and a homogenizing section, a first boss is arranged in the middle of the homogenizing section, an external thread is arranged on the first boss, an extension rod is vertically arranged on the first boss, one end of the extension column is fixedly connected to the first boss, and a thread is opened at the other end, the compression section includes a first end head and a second end head, the first end head of the compression section is provided with a first cylindrical opening adapted to the first boss, an internal thread matching the external thread on the first boss is arranged in the first cylindrical opening, and the first end head of the compression section is provided with a first cylindrical opening adapted to the first boss, an internal thread matching the external thread on the first boss is arranged in the first cylindrical opening, and the first end head of the compression section is provided with a first cylindrical opening adapted to the first boss, and an internal thread matching the external thread on the first boss is arranged in the first cylindrical opening. The two end heads are provided with second bosses, and the compression section is provided with a first cavity that passes through the first cylindrical opening and the second boss. After the homogenizing section is threadedly connected to the first cylindrical opening of the compression section through the first boss, the extension rod on the first boss can extend out of the first cavity and be threadedly connected to the feeding section. One end of the feeding section is connected to the second end head of the compression section, and this end of the feeding section is the connecting end, and the other end is the free end. The connecting end of the feeding section is provided with a second cylindrical opening that is compatible with the second boss, and the compression section is plugged into the second cylindrical opening of the feeding section through the second boss, and the feeding section is also provided with a screw hole that is compatible with the thread on the extension rod.

Preferably, the extension rod is cylindrical, and the first cavity is also cylindrical, and the sizes of the two are comparable. Here, the size of the extension rod is comparable to the size of the first cavity, which means that the size of the first cavity is slightly larger than the size of the extension rod, so that the extension rod can smoothly pass through the first cavity, the two can rotate relative to each other, and at the same time the overall strength of the screw can be ensured. Preferably, the diameter of the first cavity and the diameter of the extension rod have a size difference of 1mm-8mm. Preferably, the diameter of the first cavity and the diameter of the extension rod have a size difference of 2mm.

Preferably, the first protruding column, the first cylindrical opening, the second protruding column, the second cylindrical opening and the screw hole are coaxially arranged with the screw body.

Preferably, a second cavity is provided on the free end of the feed section, and the second cavity passes through the screw hole and the end face of the free end of the feed section. The extension rod has a threaded end which is threadedly connected to the screw hole of the feed section and then extends out of the second cavity, and the extension rod and the feed section are re-tightened by a nut.

Preferably, the injection molding machine screw comprises the following chemical components in mass percentage: Fe 11-14%, Ni 4.8-5.6%, Mo 2.0-3.0%, Mn 11.4-13.6%, Cr 11.4-13.6%, Ti 3.0-4.5%, Sc 4.0-5.5%, and the rest is TiC.

Compared with the prior art, the screw body of the present invention is provided with a feed section, a compression section and a homogenizing section. The feed section, the compression section and the homogenizing section are detachable through the first boss, the extension rod, the first cylindrical opening, the first cavity, the second boss and the second cylindrical opening. The structure is simple and easy to use. When a problem occurs in one of the sections, the section can be dismantled for repair and replaced for use. The present invention also optimizes the ratio between the various components, thereby greatly improving the wear resistance of the screw and greatly extending the service life of the screw.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic structural diagram of another embodiment of the present invention.

In the figure, 1. screw body; 2. feed section; 3. compression section; 4. homogenization section; 5. first boss; 6. extension rod; 7. first cylindrical mouth; 8. second boss; 9. first cavity; 10. connecting end; 11. free end; 12. second cylindrical mouth; 13. screw hole; 14. second cavity; 15. nut.

DETAILED DESCRIPTION

The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example 1

As shown in FIG. 1 , the present invention provides an injection molding machine screw, which includes a screw body 1 . The screw body 1 includes a feed section 2 , a compression section 3 and a homogenization section 4 that are detachably connected.

A first boss 5 is provided in the middle of the homogenizing section 4, and an external thread is provided on the first boss 5. An extension rod 6 is also vertically provided on the first boss 5. One end of the extension column is fixedly connected to the first boss 5, and the other end is provided with a thread. The compression section 3 includes a first end and a second end.

The first end of the compression section 3 is provided with a first cylindrical opening 7 adapted to the first boss 5, and the first cylindrical opening 7 is provided with an internal thread matched with the external thread on the first boss 5. The second end of the compression section 3 is provided with a second boss 8, and the compression section 3 is provided with a first cavity 9 that passes through the first cylindrical opening 7 and the second boss 8. After the homogenization section 4 is threadedly connected to the first cylindrical opening 7 of the compression section 3 through the first boss 5, the extension rod 6 on the first boss 5 can extend out of the first cavity 9 and be threadedly connected to the feeding section 2. One end of the feeding section 2 is connected to the second end of the compression section 3, and this end of the feeding section 2 is a connecting end 10, and the other end is a free end 11. The connecting end 10 of the feeding section 2 is provided with a second cylindrical opening 12 adapted to the second boss 8. The compression section 3 is plugged into the second cylindrical opening 12 of the feeding section 2 through the second boss 8, and the feeding section 2 is also provided with a screw hole 13 adapted to the thread on the extension rod 6.

The extension rod 6 is cylindrical, and the first cavity 9 is also cylindrical and the sizes of the two are comparable. Here, the size of the extension rod 6 is comparable to the size of the first cavity 9, which means that the size of the first cavity 9 is slightly larger than the size of the extension rod 6, so that the extension rod 6 can smoothly pass through the first cavity 9, the two can rotate relative to each other and at the same time ensure the overall strength of the screw. The diameter of the first cavity 9 and the diameter of the extension rod 6 have a size difference of 1mm-8mm. In this embodiment, the diameter of the first cavity 9 and the diameter of the extension rod 6 have a size difference of 2mm.

The first protruding column 5 , the first cylindrical opening 7 , the second protruding column 8 , the second cylindrical opening 12 and the screw hole 13 are coaxially arranged with the screw body 1 .

As shown in Figure 2, as a further improvement of the present invention, a second cavity 14 is provided on the free end 11 of the feed section 2, and the second cavity 14 passes through the screw hole 13 and the end face of the free end 11 of the feed section 2. The extension rod 6 has a threaded end which is threadedly connected with the screw hole 13 of the feed section 2 and then extends out of the second cavity 14, and the extension rod 6 and the feed section 2 are re-tightened by the nut 15.

The screw of the injection molding machine includes the following chemical components in mass percentage: Fe 12.5%, Ni 5.2%, Mo 2.5%, Mn 12.5%, Cr 12.5%, Ti 3.8%, Sc 4.8%, and the rest is TiC.

Example 2

The rest is the same as Example 1, except that the injection molding machine screw includes the following chemical components in mass percentage: Fe 11%, Ni 4.8%, Mo 2.0%, Mn 11.4%, Cr 11.4%, Ti 3.0%, Sc 4.0%, and the rest is TiC.

Example 3

The rest is the same as Example 1, except that the injection molding machine screw includes the following chemical components in mass percentage: Fe 14%, Ni 5.6%, Mo 3.0%, Mn 13.6%, Cr 13.6%, Ti 4.5%, Sc 5.5%, and the rest is TiC.

It should be understood that in the claims and description of the present invention, all "including..." should be understood as an open-ended meaning, that is, its meaning is equivalent to "at least contains...", and should not be understood as a closed meaning, that is, its meaning should not be understood as "only includes...".

The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims (5)

1. The utility model provides an injection molding machine screw rod, its characterized in that, it includes screw rod body (1), screw rod body (1) including detachable feed section (2), compression section (3) and homogenization section (4) that connect, the middle part of homogenization section (4) be provided with first projection (5), first projection (5) on be provided with the external screw thread, still vertical extension pole (6) that are provided with on first projection (5), one end and first projection (5) fixed connection of extension pole, the screw thread has been seted up to the other end, compression section (3) include first end and second end, the first end of compression section (3) be provided with first cylindricality mouth (7) with first projection (5) looks adaptation, be provided with in first cylindricality mouth (7) with first projection (5) on external screw thread matched with internal screw thread, the second end of compression section (3) is provided with second projection (8), be provided with on compression section (3) and link up first projection (7) and first projection (9) of first projection (5) through first extension section (7) and first projection (5) cavity (9), one end of the feeding section (2) is connected with the second end of the compression section (3), the end of the feeding section (2) is a connecting end (10), the other end of the feeding section (2) is a free end (11), the connecting end (10) of the feeding section (2) is provided with a second cylindrical opening (12) matched with the second convex column (8), the compression section (3) is spliced with the second cylindrical opening (12) of the feeding section (2) through the second convex column (8), and the feeding section (2) is further provided with a screw hole (13) matched with the screw thread on the extension rod (6).

2. An injection molding machine screw according to claim 1, wherein the extension rod (6) is cylindrical and the first cavity (9) is also cylindrical and of comparable dimensions.

3. The screw of the injection molding machine according to claim 1, wherein the first boss (5), the first cylindrical opening (7), the second boss (8), the second cylindrical opening (12) and the screw hole (13) are coaxially arranged with the screw body (1).

4. An injection molding machine screw according to claim 1, wherein the free end (11) of the feeding section (2) is provided with a second cavity (14), the second cavity (14) penetrates through the screw hole (13) and the end face of the free end (11) of the feeding section (2), one threaded end of the extension rod (6) is in threaded connection with the screw hole (13) of the feeding section (2) and then extends out of the second cavity (14), and the extension rod (6) and the feeding section (2) are fastened again through a nut (15).

5. An injection molding machine screw according to claim 1, wherein the injection molding machine screw comprises the following chemical components in percentage by mass: 11-14% of Fe, 4.8-5.6% of Ni, 2.0-3.0% of Mo, 11.4-13.6% of Mn, 11.4-13.6% of Cr, 3.0-4.5% of Ti, 4.0-5.5% of Sc and the balance of TiC.