Exhaust screw set

Abstract

The utility model relates to an exhaust screw set, the exhaust screw set comprises a stopper, a non-return ring, a screw head and a screw, the stopper and the non-return ring are sequentially installed at the top end of the screw head, the tail end of the screw head is fixedly installed at the top end of the screw, a meson is arranged in the middle of the screw head, and the screw head is fixedly installed at the top end of the screw. The screw head located behind the meson sequentially comprises an exhaust part and a connecting part, the axis of the exhaust part and the axis of the connecting part are hollow, an exhaust assembly is arranged outside the exhaust part, at least one exhaust gap is formed in the exhaust assembly, and the exhaust gap can enable gas to pass through but isolate molten colloid. The exhaust part is provided with an exhaust channel communicated with the exhaust gap and the axis, and the axis of the screw is hollow and communicated with the hollow axis of the connecting part. The exhaust assembly is arranged on the screw head, so that gas can be collected to the axis of the screw head and then exhausted to the atmosphere through the hollow screw, and the purpose of gas-liquid separation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding accessories, in particular to an exhaust screw group. Background Art

[0002] Nowadays, injection molding products are becoming more and more widespread, and the requirements for mechanical equipment, molds, raw materials, processes and environment are getting higher and higher. During the injection molding process, the air mixed in the molten colloid must be discharged to avoid bubbles in the final product, and also to avoid black spots, black lines, yellowing, discoloration, etc.

[0003] In order to produce qualified products, there are two existing methods: one is to dry and dehumidify the moisture in the raw materials, which requires a lot of electricity, resulting in an increase in processing costs; and it is necessary to invest in a large amount of drying equipment, resulting in increased investment. The drying equipment occupies a large amount of production space, and the hot air and dust it exhausts cause the temperature in the production area to rise, thereby wasting the electricity bill for air conditioning and refrigeration. The second is to install an exhaust valve on the screw housing to discharge the gas mixed in the colloid from the exhaust valve. This method easily causes the colloid to leak from the exhaust valve, resulting in a waste of raw materials, and the subsequent cleaning of the exhaust valve is also very troublesome.

[0004] Therefore, the art needs to develop an exhaust screw assembly with a completely new gas-liquid separation method. Utility Model Content

[0005] The purpose of the utility model is to provide an exhaust screw assembly in order to overcome the defects of the prior art.

[0006] In order to achieve the purpose of the utility model, the present application provides the following technical solutions.

[0007] In the first aspect, the present application provides an exhaust screw group, which includes a stopper, a check ring, a screw head and a screw, wherein the stopper and the check ring are sequentially installed at the top of the screw head, and the tail end of the screw head is fixedly installed at the top of the screw, and a meson is provided in the middle of the screw head. The screw head located behind the meson includes an exhaust part and a connecting part in sequence, and the exhaust part and the connecting part are hollow at the axis, and an exhaust component is provided on the outside of the exhaust part, and at least one exhaust gap is provided in the exhaust component, and the exhaust gap can allow gas to pass through but isolate the molten colloid, and the exhaust part is provided with an exhaust channel connecting the exhaust gap and the axis, and the axis of the screw is hollow and connected to the hollow axis of the connecting part.

[0008] In one embodiment of the first aspect, the exhaust assembly includes at least one group of exhaust units, each group of exhaust units includes a first ring piece and a second ring piece, the first ring piece and the second ring piece are sleeved on the exhaust part, and the inner hole diameters of the first ring piece and the second ring piece match the outer diameter of the exhaust part, and at least one exhaust gap is provided between the first ring piece and the second ring piece.

[0009] In an implementation of the first aspect, exhaust gaps are provided on two side surfaces of the first ring piece, two side surfaces of the second ring piece are smooth and flat, and the first ring piece and the second ring piece are alternately abutted in sequence.

[0010] In one embodiment of the first aspect, the first ring piece and the second ring piece have the same structure and the first ring piece and the second ring piece are alternately abutted in sequence, and the first ring piece and the second ring piece each include a side with an exhaust gap and a smooth and flat side. During installation, the side with the exhaust gap of a first ring piece abuts the smooth and flat side of its adjacent second ring piece, and the smooth and flat side of the first ring piece abuts the side with the exhaust gap of another adjacent second ring piece.

[0011] In one embodiment of the first aspect, the first ring piece and the second ring piece have the same structure and the first ring piece and the second ring piece are alternately abutted in sequence, and the first ring piece and the second ring piece each include a side with an exhaust gap and a smooth and flat side. During installation, the side with the exhaust gap of a first ring piece abuts the side with the exhaust gap of an adjacent second ring piece, and the smooth and flat side of the first ring piece abuts the smooth and flat side of another adjacent second ring piece.

[0012] In an implementation of the first aspect, a depth of the exhaust gap is 0.001 to 0.3 mm.

[0013] In one implementation of the first aspect, the outer ring of the first ring piece and / or the second ring piece is provided with evenly distributed mixing teeth.

[0014] In an implementation of the first aspect, a plurality of exhaust grooves are provided on the outer surface of the exhaust portion, the exhaust grooves are distributed along the axial direction of the exhaust portion, and each of the exhaust grooves is connected to an inner end of an exhaust gap.

[0015] In an implementation manner of the first aspect, the exhaust portion is provided with a plurality of exhaust channels perpendicular to the axis, one end of each exhaust channel is communicated with the bottom of the exhaust groove, and the other end is communicated with the hollow axis.

[0016] In one embodiment of the first aspect, an internal thread matching the connecting portion is provided at the top axis of the screw and is threadedly connected to the connecting portion; a conveying thread is provided on the middle outer wall of the screw, the tail end of the screw is a smooth circle, and an air outlet is provided at the smooth circle, and the air outlet is connected to the hollow axis of the screw.

[0017] In an implementation of the first aspect, a side wall of the light circle is provided with an air outlet channel perpendicular to the axis.

[0018] In one embodiment of the first aspect, the top end of the screw head is provided with a hexagonal wrench position, an external threaded portion, a front guide, a glued smooth circle and a meson in sequence from front to back, and the screw head is integrated as a whole.

[0019] In one embodiment of the first aspect, an internal threaded portion and a stopper sealing guide are provided in the middle portion of the stopper head, wherein the external threaded portion and the internal threaded portion match each other, the stopper head sealing guide sleeve is arranged outside the front guide, and the front guide and the stopper head sealing guide are interference fit by shrink sleeve.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] (1) The utility model provides an exhaust assembly on the screw head, so that the gas can be collected at the axis of the screw head, achieving the purpose of gas-liquid separation;

[0022] (2) Exhaust is carried out through the screw head and the hollow axis of the screw, avoiding the installation of a gas-liquid separation valve, saving equipment costs, and avoiding the waste of molten colloid;

[0023] (3) It can ensure that there is no air in the final product, which will not cause discoloration, deterioration, etc. It can also avoid the appearance of bubbles in the product and improve product quality;

[0024] (4) Drying equipment can be omitted, which not only reduces the investment amount of drying equipment, but also saves the electricity consumed by the drying equipment; in addition, it can optimize the workshop environment, reduce the workshop temperature, and save air conditioning electricity costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the exhaust screw assembly of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the screw head of the utility model;

[0027] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of AA;

[0028] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the middle BB;

[0029] Figure 5 for Figure 2 Schematic diagram of the cross-sectional structure of the CC;

[0030] Figure 6 for Figure 2 Schematic diagram of the cross-sectional structure of the middle DD;

[0031] Figure 7 It is a schematic diagram of the structure of the screw head, stopper head, check ring and exhaust assembly after assembly of the utility model;

[0032] Figure 8 This is a schematic diagram of the structure of the stopper of the utility model;

[0033] Fig. 9 This is a schematic diagram of the structure of the non-return ring of the utility model;

[0034] Fig.10 is a schematic side view of the structure of the first ring piece;

[0035] Fig.11 is a schematic diagram of the front structure of the first ring piece;

[0036] Fig.12 is a schematic diagram of the front structure of the second ring piece;

[0037] Fig.13 It is a structural schematic diagram of the screw rod of the utility model;

[0038] Fig.14 for Fig.13 Schematic diagram of the cross-sectional structure of EE;

[0039] Fig.15 This is a schematic diagram of the side structure of the first ring piece and the second ring piece after assembly in Example 2.

[0040] In the accompanying drawings, 1 is a screw head, 2 is a screw, 3 is an exhaust assembly, 4 is a stopper, 5 is a check ring, 6 is a screw center hole, 7 is a front hexagonal wrench position, 8 is an external threaded portion, 9 is a front guide, 10 is a glue-passing light circle, 11 is a meson, 12 is an exhaust portion, 13 is a connecting portion, 14 is a rear hexagonal wrench position, 15 is an exhaust center hole, 16 is an exhaust groove, 17 is an exhaust channel, 18 is an internal threaded portion, 19 is a glue-passing groove, 20 is a conical head, 21 is a wrench position, 22 is a first ring piece, 23 is a second ring piece, 24 is an exhaust gap, 25 is a mixing tooth, 26 is an internal threaded portion at the front end of the screw, 27 is a feed point, 28 is a light circle, and 29 is an exhaust channel. DETAILED DESCRIPTION

[0041] Unless otherwise defined, the technical terms or scientific terms used in this specification and claims shall have the ordinary meanings understood by persons with ordinary skills in the technical field to which the utility model belongs. All the values ​​from the lowest value to the highest value listed in this article refer to all the values ​​obtained by incrementing one unit between the lowest value and the highest value when the difference between the lowest value and the highest value is more than two units.

[0042] The following will describe the specific implementation of the utility model in conjunction with the accompanying drawings. It should be pointed out that in the specific description of these implementations, in order to provide a concise description, this specification cannot provide a detailed description of all the features of the actual implementation. Without departing from the spirit and scope of the utility model, those skilled in the art may modify and replace the implementation of the utility model, and the resulting implementation is also within the scope of protection of the utility model.

[0043] There are two ways to degas traditional injection molding machines: one is to set an exhaust valve on the shell, and when the screw transports the colloid to the exhaust valve, the gas is discharged from the exhaust valve. This form requires the installation of an exhaust valve on the shell of the injection molding machine, and it is also necessary to ensure that only gas is allowed to be discharged, and the molten colloid cannot be discharged. The structure is relatively complex and the cost is high. The other is to set up a drying equipment to completely dry the plastic before injection molding. The cost of this method is relatively high. The purpose of this application is to provide an exhaust screw group, which is to collect the gas to the axis of the screw head, and then discharge the gas through the screw, which can not only achieve gas-liquid separation, but also avoid the setting of exhaust valves or drying equipment, thereby reducing costs.

[0044] Specifically, a venting screw group includes a stopper, a check ring, a screw head and a screw, wherein the stopper and the check ring are sequentially installed at the top of the screw head, and the tail end of the screw head is fixedly installed at the top of the screw, and a meson is provided in the middle of the screw head. The screw head located behind the meson sequentially includes an exhaust part and a connecting part, wherein the exhaust part and the connecting part are hollow at the axis, and an exhaust component is provided on the outside of the exhaust part, wherein at least one exhaust gap is provided in the exhaust component, wherein the exhaust gap enables gas to pass through but isolates molten colloid, and an exhaust channel connecting the exhaust gap and the axis is provided on the exhaust part, and the axis of the screw is hollow and connected to the hollow axis of the connecting part. When the molten colloid with gas is transported to the top of the screw, that is, the position of the screw head, the pressure of the colloid here is relatively high. When the exhaust gap and the exhaust channel are set, and as long as the gap depth of the exhaust gap is ensured to be small, the gas can pass through the exhaust gap and the exhaust channel, and finally gather in the hollow part of the axis of the screw head, and then be discharged outward through the hollow axis of the screw. Therefore, the injection molding machine does not need to set up an additional exhaust valve, saving equipment costs. At the same time, because the exhaust gap is very small, the colloid cannot enter the exhaust gap, and can only continue to flow forward into the space between the screw head and the check ring, and finally be injection molded. The screw head can ensure that there is no air in the injection molded colloid, thereby improving product quality. In this application, structures such as the stopper head and the check ring are prior art.

[0045] In a specific embodiment, the exhaust assembly includes at least one exhaust unit, each exhaust unit includes a first ring sheet and a second ring sheet, the first ring sheet and the second ring sheet are sleeved on the exhaust portion, and the inner hole diameters of the first ring sheet and the second ring sheet match the outer diameter of the exhaust portion, and at least one exhaust gap is provided between the first ring sheet and the second ring sheet. The exhaust gap is set from the outer diameter of the ring sheet to the inner diameter (pointing to the axis), and the number of the exhaust gaps is 1 to 20, preferably 4 to 10. The number of exhaust units can be set to 1 to 50.

[0046] In a specific embodiment, exhaust gaps are provided on the two sides of the first ring sheet, the two sides of the second ring sheet are smooth and flat, and the first ring sheet and the second ring sheet are alternately abutted in sequence. This is a preferred way to set the exhaust gaps, and the following other ways may also be used: for example, an exhaust gap is provided on one side of the first ring sheet, the other side is smooth and flat, and both sides of the second ring sheet are smooth and flat. For another example, the first ring sheet and the second ring sheet have the same structure, both have an exhaust gap provided on one side, and the other side is smooth and flat, and then are arranged in sequence at intervals. For another example, exhaust gaps are evenly provided on both sides of the first ring sheet and the second ring sheet.

[0047] The first ring piece is closest to the meson, and the first ring piece abuts against the tail end of the meson, and the second ring piece is closest to the screw, and the second ring piece abuts against the top end of the screw. This arrangement allows the exhaust assembly to be clamped by the meson and the screw, ensuring that there is only one exhaust outlet, the exhaust gap, in the exhaust assembly, avoiding the existence of other gaps between the first ring piece and the second ring piece due to the lack of tight fit, thereby causing the colloid to flow into the exhaust assembly and block the exhaust channel.

[0048] In a specific embodiment, the depth of the exhaust gap is 0.001-0.3 mm. The depth can be comprehensively considered according to factors such as the viscosity of the colloid and the injection flow rate of the injection molding machine. The greater the viscosity of the colloid, the greater the depth of the exhaust gap can be set. The greater the flow rate of the injection molding machine, the greater the pressure at the top of the screw, and the smaller the depth of the exhaust gap is required. In short, the depth of the exhaust gap must ensure that the gas can pass through, but the colloid cannot enter the exhaust gap.

[0049] In a specific embodiment, the outer ring of the first ring piece and / or the second ring piece is provided with evenly distributed mixing teeth. The mixing teeth are provided on the second ring piece, so that the raw materials can be stirred more evenly and made denser, and the gas in the raw materials can be dispersed and discharged from the exhaust gap.

[0050] In a specific embodiment, the outer surface of the exhaust portion is provided with a plurality of exhaust grooves, the exhaust grooves are distributed along the axial direction of the exhaust portion, and each exhaust groove is connected to the inner end of an exhaust gap. The exhaust grooves are mainly used to connect the exhaust gap and the exhaust channel, so that the air in each exhaust gap is collected in the exhaust groove, then enters the exhaust channel, and finally reaches the axis of the screw head.

[0051] In a specific embodiment, the exhaust portion is provided with a plurality of exhaust channels perpendicular to the axis, one end of each exhaust channel is connected to the bottom of the exhaust groove, and the other end is connected to the hollow axis.

[0052] In a specific embodiment, an internal thread matching the connecting part is provided at the top axis of the screw and is connected to the connecting part through a thread; a conveying thread is provided on the middle outer wall of the screw, the tail end of the screw is a smooth circle, and an air outlet is provided at the smooth circle, and the air outlet is connected to the hollow axis of the screw.

[0053] In a specific embodiment, the side wall of the light circle is provided with an air outlet channel perpendicular to the axis. Alternatively, the air outlet channel may not be provided, and the entire axis of the screw may be set to a hollow state, that is, the air outlet is located at the axis of the tail end of the screw, as long as it can be ensured that the gas can pass through the hollow axis of the screw, the air outlet channel, and the air outlet to be discharged into the air.

[0054] In a specific embodiment, the top of the screw head is provided with a hexagonal wrench position, an external threaded portion, a front guide, a glue-over smooth circle and a meson in sequence from front to back, and the screw head is integrated as a whole. The meson and the screw head of the present application are integrally formed, that is, they are directly formed by mechanical processing. The one-piece design reduces many problems of matching errors and processing errors of multiple split parts in the past, and can ensure that the tail end plane of the meson is perpendicular to the axis of the screw head. When the screw head is screwed into the screw, the tail end of the meson and the top of the screw can just clamp the exhaust component tightly, which plays a sealing role. On the one hand, it can prevent the colloid from entering from the contact surface between the meson and the exhaust component or the contact surface between the exhaust component and the screw, blocking the exhaust groove, that is, the exhaust channel. On the other hand, it can also prevent the air between the connecting portion and the screw from overflowing, ensuring product quality.

[0055] In a specific embodiment, an internal threaded portion and a stopper sealing guide are provided in the middle of the stopper head, wherein the external threaded portion and the internal threaded portion match each other, the stopper head sealing guide sleeve is arranged outside the front guide, and the front guide and the stopper head sealing guide are interference fit by shrink sleeve. Under normal conditions, the inner diameter of the stopper head sealing guide is smaller than the outer diameter of the front guide. During installation, the stopper head is heated to expand so that the inner diameter of the stopper head sealing guide is larger than the outer diameter of the front guide. Taking advantage of this, the stopper head sealing guide sleeve is arranged outside the front guide. After the stopper head is cooled, the stopper head sealing guide shrinks, thereby achieving an interference fit with the front guide. Since the stopper head sealing guide and the front guide are in an interference fit state, the air between the external threaded portion and the internal threaded portion cannot escape, thereby ensuring the quality of the product.

[0056] Example

[0057] The following will describe in detail an embodiment of the present invention in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0058] Example 1

[0059] An exhaust screw assembly, the structure of which is as follows Figure 1 As shown, it includes a stopper 4, a check ring 5, a screw head 1, a screw 2, an exhaust assembly 3 and other parts. The specific structure of each part is as follows:

[0060] The structure of the screw head 1 is as follows Figure 2 to Figure 6As shown, the screw head 1 is an integrated structure, which includes a front hexagonal wrench position 7, an external threaded portion 8, a front guide 9, a glued smooth circle 10, a meson 11, an exhaust portion 12, a connecting portion 13 and a rear hexagonal wrench position 14 from the top end (left) to the tail end (right). The right end of the screw head 1 is fixedly connected to the screw 2 via the connecting portion 13. The front hexagonal wrench position 7 and the rear hexagonal wrench position 14 are used to disassemble and install the screw head 1. A meson 11 is integrally formed in the middle of the screw head 1. The left end face of the meson 11 is conical. The right end of the meson 11 is the exhaust portion 12. The exhaust portion 12 is provided with an exhaust assembly 3. The two ends of the exhaust assembly 3 are clamped by the meson 11 and the top of the screw 2 respectively. The front guide 9 is used for guiding and positioning when the screw head 1 and the stopper 4 are installed. Four exhaust grooves 16 are provided on the outer surface of the exhaust portion 12, as shown in FIG. Figure 4 , Figure 5 As shown, the exhaust grooves 16 are distributed along the axial direction of the exhaust portion 12. Four exhaust channels 17 are also provided on the exhaust portion 12, and each exhaust groove 16 is connected to the exhaust hole 15 through an exhaust channel 17, and the exhaust hole 15 is connected to the screw hole 6 of the screw 2.

[0061] The structures of the stopper 4 and the check ring 5 are as follows: Figure 7 , Figure 8 As shown, the outer wall of the stopper 4 includes a conical head 20 and a wrench position 21, and an inner hole is provided in the middle of the stopper 4. An internal threaded portion 18 and a glue groove 19 are provided in the inner hole from left to right, and a guide matching the front guide 9 is provided on the glue groove 19. Among them, the external threaded portion 8 and the internal threaded portion 18 match each other, the glue groove 19 is sleeved on the outside of the front guide 9, and the front guide 9 and the glue groove 19 are interference fit by heat sleeve, and the guides of the two are also interference fit. The check ring 5 is a hollow annular structure, which is sleeved on the outside of the glue smooth circle 10 of the screw head 1, and the inner wall of the check ring 5 and the outer wall of the glue smooth circle 10 form a glue passage. The structure after the stopper 4, the check ring 5 and the exhaust assembly 3 are installed on the screw head 1 is as shown. Fig. 9 shown.

[0062] In this embodiment, the structure of the exhaust assembly is as follows: Figure 10 to Figure 12 As shown, the exhaust assembly 3 is composed of 8 groups of exhaust units, each of which includes a first ring piece 22 and a second ring piece 23. The structure of the first ring piece 22 is as shown in FIG. Fig.10 , Fig.11 As shown, the structure of the second ring piece 23 is as follows Fig.12As shown, the inner hole diameters of the first ring piece 22 and the second ring piece 23 match the outer diameter of the exhaust portion 12, and four exhaust gaps 24 are provided on one side of the first ring piece 22, the depth of the exhaust gap 24 is 0.01 mm, and the inner side of each exhaust gap 24 is connected to the exhaust groove 16, and the other side of the first ring piece 22 is smooth and flat. The two side surfaces of the second ring piece 23 are smooth and flat, and the first ring piece 22 and the second ring piece 23 are alternately abutted in sequence. The first ring piece 22 is closest to the meson 11 and is in close contact with the smooth and flat side of the first ring piece 22, and the second ring piece 23 is closest to the screw 2. The outer ring of the second ring piece 23 is provided with evenly distributed mixing teeth 25.

[0063] The structure of screw 2 is as follows Fig.13 , 14 As shown, the screw 2 includes a conveying thread on the left and a light circle 28 on the right, and a feed place 27 is set between the two. The structure of the conveying thread can refer to the applicant's prior patent CN216860501U. In this embodiment, the screw hole 6 is hollow, and a screw front end internal thread portion 26 is provided at the top axis of the screw 2, which matches the external thread on the outside of the connecting portion 13 of the screw head 1, and the screw hole 6 is connected to the exhaust hole 15. Four air outlet channels 29 are provided at the light circle 28 to connect the screw hole 6 and the atmosphere.

[0064] During operation, solid materials are added from the feed point 27 and transported to the top along with the screw 2. During the transportation process, the solid materials melt and mix with the air. The molten colloid with gas flows from right to left along with the screw 2. The pressure of the molten colloid gradually increases. When it flows to the exhaust part 12, the pressure of the colloid is relatively large, and the gas can enter the exhaust component 3 from the exhaust gap 24, and finally gather in the exhaust groove 16, and then reach the exhaust hole 15 through the exhaust channel 17, and then enter the screw hole 6, and finally be discharged into the air through the outlet channel 29. Due to the small depth of the exhaust gap 24, the colloid cannot enter the exhaust gap 24, and the colloid can only flow into the space between the meson 11 and the check ring 5, so that the gas and liquid are separated, and the colloid (liquid) is injected from the nozzle to form a product, and there will be no residual air in the product.

[0065] Example 2

[0066] A similar exhaust screw head as in Example 1 is used, except that:

[0067] The first ring piece 22 and the second ring piece 23 have the same structure, with one side having an exhaust slit 24 and the other side being smooth and flat. During installation, the side with the exhaust slit 24 abuts against the smooth and flat side of the adjacent ring piece. Fig.15 As shown, the depth of the exhaust gap 24 is 0.1 mm. The outer edges of the first ring piece 22 and the second ring piece 23 may also be provided with mixing teeth, or may not be provided with mixing teeth. Fig.15 The display shows the state without mixing teeth.

[0068] The above description of the embodiments is to facilitate those of ordinary skill in the art to understand and apply the present application. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without having to pay creative labor. Therefore, the present application is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art based on the contents disclosed in the present application without departing from the scope and spirit of the present application are within the scope of the present application.

Claims

1. An exhaust screw assembly, comprising a stopper, a check ring, a screw head and a screw, wherein the stopper and the check ring are sequentially mounted on the top of the screw head, and the tail end of the screw head is fixedly mounted on the top of the screw, characterized in that: A meson is provided in the middle of the screw head, and the screw head located behind the meson includes an exhaust part and a connecting part in sequence. The exhaust part and the connecting part are hollow at the axis, and an exhaust component is provided on the outside of the exhaust part. At least one exhaust gap is provided in the exhaust component, and the exhaust gap allows gas to pass through but isolates the molten colloid. The exhaust part is provided with an exhaust channel connecting the exhaust gap and the axis. The axis of the screw is hollow and connected to the hollow axis of the connecting part.

2. The exhaust screw assembly according to claim 1, characterized in that: The exhaust assembly includes at least one group of exhaust units, each group of exhaust units includes a first ring sheet and a second ring sheet, the first ring sheet and the second ring sheet are sleeved on the exhaust part, and the inner hole diameters of the first ring sheet and the second ring sheet match the outer diameter of the exhaust part, and at least one exhaust gap is provided between the first ring sheet and the second ring sheet.

3. The exhaust screw assembly according to claim 2, characterized in that: The first ring piece and the second ring piece have the following forms: (a) Exhaust gaps are provided on two side surfaces of the first ring piece, and two side surfaces of the second ring piece are smooth and flat, and the first ring piece and the second ring piece are alternately abutted in sequence.

4. The exhaust screw assembly according to claim 2, characterized in that: The first ring piece and the second ring piece have the following forms: (b) The first ring piece and the second ring piece have the same structure and the first ring piece and the second ring piece are alternately abutted in sequence. The first ring piece and the second ring piece each include a side with an exhaust gap and a smooth and flat side. When installed, the side with the exhaust gap of a first ring piece abuts against the smooth and flat side of its adjacent second ring piece, and the smooth and flat side of the first ring piece abuts against the side with the exhaust gap of another adjacent second ring piece.

5. The exhaust screw assembly according to claim 2, characterized in that: The first ring piece and the second ring piece have the following forms: (c) The first ring piece and the second ring piece have the same structure and the first ring piece and the second ring piece are alternately abutted in sequence. The first ring piece and the second ring piece each include a side with an exhaust gap and a smooth and flat side. When installed, the side with the exhaust gap of a first ring piece abuts against the side with the exhaust gap of an adjacent second ring piece, and the smooth and flat side of the first ring piece abuts against the smooth and flat side of another adjacent second ring piece.

6. The exhaust screw assembly according to any one of claims 1 to 5, characterized in that: The depth of the exhaust gap is 0.001-0.3 mm.

7. The exhaust screw assembly according to claim 2, characterized in that: The outer ring of the first ring piece and / or the second ring piece is provided with evenly distributed mixing teeth.

8. The exhaust screw assembly according to claim 1, characterized in that: A plurality of exhaust grooves are arranged on the outer surface of the exhaust portion, and the exhaust grooves are distributed along the axial direction of the exhaust portion, and each of the exhaust grooves is communicated with the inner end of an exhaust gap.

9. The exhaust screw assembly according to claim 8, characterized in that: The exhaust part is provided with a plurality of exhaust channels perpendicular to the axis, one end of each exhaust channel is communicated with the bottom of the exhaust groove, and the other end is communicated with the hollow axis.

10. The exhaust screw assembly according to claim 1, characterized in that: An internal thread matching the connecting part is provided at the top axis of the screw and is connected to the connecting part through a thread; a conveying thread is provided on the middle outer wall of the screw, the tail end of the screw is a smooth circle, and an air outlet is provided at the smooth circle, and the air outlet is connected to the hollow axis of the screw.

11. The exhaust screw assembly according to claim 10, characterized in that: The side wall of the light circle is provided with an air outlet channel perpendicular to the axis.

12. The exhaust screw assembly according to claim 1, characterized in that: The top of the screw head is provided with a hexagonal wrench position, an external threaded portion, a front guide, a glued smooth circle and a meson in sequence from front to back, and the screw head is integrated as a whole.

13. The exhaust screw assembly according to claim 12, characterized in that: An internal threaded portion and a stopper sealing guide are provided in the middle of the stopper, wherein the external threaded portion and the internal threaded portion match each other, the stopper sealing guide sleeve is arranged outside the front guide, and the front guide and the stopper sealing guide are connected by threads.

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