Novel machine barrel screw

Abstract

The utility model provides a novel machine barrel screw which solves the problem that an existing screw is not ideal in material mixing uniformity. The mixing section is arranged between the compression section and the decompression exhaust section; the check rings are arranged on the mixing section, the number of the check rings is at least two, the check rings are arranged at intervals, flow channels are evenly distributed on the check rings, and the front flow channel and the rear flow channel are arranged in a staggered mode; the stirring columns are uniformly distributed in the circumferential direction of the metering section. The number of the check rings is multiple, due to the fact that the gaps are formed between the check rings, plasticized melt is divided through the flow channels, then mixed at the gaps, divided and mixed at different positions for multiple times and then stirred and mixed at the metering section through the stirring columns, the melt mixing uniformity can be effectively improved, and then the quality of extruded products is ensured.

Description

Technical Field

[0001] This utility model relates to the field of extrusion equipment technology, specifically to a novel barrel screw. Background Technology

[0002] During extrusion, raw materials and additives are added to the barrel in a specific ratio. The rotation of the screw and the heating of the barrel molten the mixture into a polymer. The screw then propels the mixture forward at a certain pressure and speed, continuously extruding it from the die head to form the desired plastic part. Currently available venting screws, such as the novel venting screw for a PET injection molding machine disclosed in Chinese Patent Publication No. CN205800114, include a first-stage screw and a second-stage screw. The first-stage screw has a feeding section and a compression section, while the second-stage screw has a pressure-reducing venting section and a metering section. A flow divider is located between the compression section and the pressure-reducing venting section for mixing. However, this structure generally results in uneven mixing of the molten raw materials and additives, failing to guarantee the quality of the injection-molded product. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model provides a novel barrel screw that solves the problem of unsatisfactory mixing uniformity of existing screws.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A novel barrel screw includes a first-stage screw and a second-stage screw. The first-stage screw has a feeding section and a compression section, and the second-stage screw has a pressure-reducing and venting section and a metering section. The feature is that it further includes:

[0006] The mixing section is located between the compression section and the decompression and exhaust section;

[0007] A baffle ring is disposed on the mixing section. There are at least two baffle rings arranged at intervals. Flow channels are evenly distributed on the baffle rings, and the flow channels at the front and rear are arranged in an alternating manner.

[0008] The stirring column is evenly distributed around the circumference of the metering section.

[0009] The metering section has a return groove on its screw thread.

[0010] The stirring column consists of at least two sets, with the front and rear stirring columns arranged alternately.

[0011] The pressure relief exhaust section is equipped with double spiral ribs.

[0012] The first-order screw and the second-order screw are connected by threads.

[0013] The discharge end of the second-stage screw is provided with a check ring, and the front end of the check ring is provided with a pin for limiting the check ring.

[0014] Both the first-order and second-order screws have wear-resistant layers on their screw edges.

[0015] The beneficial effects of this utility model are:

[0016] There are multiple baffle rings. Due to the spacing between the baffle rings, the plasticized molten material is diverted through the flow channel and then mixed at the spacing. After the molten material is diverted and mixed at different locations multiple times, it is then stirred and mixed by the stirring column at the metering section. This can effectively improve the uniformity of the molten material mixing and thus ensure the quality of the extruded product. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the present invention.

[0018] Figure 2 This is a utility model Figure 1 Enlarged diagram of point A in the middle.

[0019] Figure 3 This is a utility model Figure 1 Enlarged diagram of point B in the middle.

[0020] Figure 4 This is a utility model Figure 1 Enlarged diagram of point C in the middle.

[0021] Feeding section 1, compression section 2, pressure reduction and exhaust section 3, metering section 4, mixing section 5, retaining ring 6, flow channel 7, stirring column 8, reflux trough 9, check ring 10, pin shaft 11, wear-resistant layer 12. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] In the embodiments, such as Figure 1 , Figure 2 , Figure 3 As shown, a novel barrel screw includes a first-stage screw and a second-stage screw. The first-stage screw has a feeding section 1 and a compression section 2, and the second-stage screw has a pressure reducing and venting section 3 and a metering section 4. It also includes:

[0024] The mixing section 5 is located between the compression section 2 and the pressure relief and exhaust section 3;

[0025] A baffle ring 6 is disposed on the mixing section 5. There are at least two baffle rings 6 arranged at intervals. Flow channels 7 are evenly distributed on the baffle ring 6, and the front and rear flow channels 7 are arranged in an alternating manner.

[0026] The stirring column 8 is evenly distributed around the circumference of the metering section 4.

[0027] There are multiple baffle rings 6. Since there is a gap between the baffle rings 6, the plasticized molten material is diverted through the flow channel 7 and then mixed at the gap. After the molten material is diverted and mixed at different positions multiple times, the molten material is stirred and mixed by the stirring column 8 at the metering section 4, which can effectively improve the uniformity of the molten material mixing and thus ensure the quality of the extruded product.

[0028] In the embodiments, such as Figure 1 , Figure 3 As shown, the screw thread of the metering section 4 is provided with a return groove 9. Part of the molten material can flow back from the front screw groove to the rear screw groove through the return groove 9 to mix the molten material and improve the uniformity of the molten material mixing.

[0029] In the embodiments, such as Figure 1 , Figure 3 As shown, there are at least two sets of stirring columns 8, with the front and rear stirring columns 8 arranged alternately. The alternately arranged stirring columns 8 can better mix the molten material evenly.

[0030] In the embodiments, such as Figure 1 , Figure 2 As shown, the pressure-reducing exhaust section 3 is equipped with double helical ribs. This facilitates stable feeding and reduces the accumulation and retention of molten material in the mixing section.

[0031] In the embodiments, such as Figure 1 , Figure 2 As shown, the first-order screw and the second-order screw are connected by threads. The first-order screw and the second-order screw are connected and then welded. The first-order screw and the second-order screw can be machined separately, which is convenient.

[0032] In the embodiments, such as Figure 1 , Figure 3 As shown, the discharge end of the second-stage screw is provided with a check ring 10, and the front end of the check ring 10 is provided with a pin 11 for limiting the check ring 10. The pin 11 is used to prevent the check ring 10 from moving in the discharge direction, and at the same time, the pin 11 facilitates the assembly and disassembly of the check ring 10.

[0033] In the embodiments, such as Figure 4 As shown, both the first-order and second-order screws have wear-resistant layers 12 on their screw edges. The wear-resistant layer 12 is made of alloy steel, stainless steel, or other polymer materials, and is used to reduce wear on the screw edges and improve the service life of the screw.

[0034] Obviously, the above embodiments of this utility model are merely illustrative examples and not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, these obvious variations or modifications derived from the essential spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A new type of barrel screw comprising a first stage screw provided with a feeding section (1) and a compression section (2) and a second stage screw provided with a decompression venting section (3) and a metering section (4), characterized in that, Also include: Mixing section (5) is arranged between the compression section (2) and the decompression exhaust section (3); Baffle ring (6) is arranged on the mixing section (5), the baffle ring (6) is at least two and is arranged in interval, the baffle ring (6) is uniformly distributed with flow channel (7), and the front and rear flow channels (7) are staggered arrangement; Stirring column (8) is uniformly distributed in the circumference of the metering section (4); The screw rib of the metering section (4) is provided with backflow groove (9).

2. A novel barrel screw as claimed in claim 1, wherein: The stirring column (8) is at least two groups, and the front and rear stirring columns (8) are staggered arrangement.

3. A novel barrel screw as claimed in claim 1, wherein: The decompression exhaust section (3) is provided with double screw rib.

4. A novel barrel screw as claimed in claim 1, wherein: The first-order screw and the second-order screw are threadedly connected.

5. A novel barrel screw as claimed in claim 1, wherein: The discharge end of the second-order screw is provided with a check ring (10), and the front end of the check ring (10) is provided with a pin shaft (11) for limiting the check ring (10).

6. A novel barrel screw as claimed in claim 1, wherein: The screw rib on the first-order screw and the second-order screw is provided with a wear-resistant layer (12).

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