Exhaust screw head

Abstract

The utility model relates to an exhaust screw head which comprises a meson, an exhaust part and a connecting part which are connected in sequence, the connecting part is fixed with one end of a screw, an exhaust component is arranged outside the exhaust part, an exhaust gap perpendicular to the axial direction of the exhaust part is arranged in the exhaust component, the axis of the exhaust part and the axis of the connecting part are hollow, and the exhaust part and the connecting part are arranged in a hollow mode. And the exhaust part is provided with an exhaust channel which is communicated with the exhaust gap and the axis. By arranging the exhaust assembly, air in molten colloid can be exhausted from the axis of the screw head, and the air in the colloid is prevented from influencing a product.

Description

Technical Field

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

[0002] Nowadays, injection molded products have become more and more widespread, and the products have higher and higher requirements for mechanical equipment, molds, raw materials, processes and environment. The screw head is a component installed at the front end of the screw. During high-pressure injection, it can effectively seal the melt in front of the screw head to prevent backflow. During injection molding, plastic particles are put in, melted at high temperature, and pushed forward by the screw, and finally ejected from the nozzle. Because there are gaps between plastic particles, after they melt, there must be a lot of gas between the plastic colloids. If this part of the gas is not discharged, bubbles will remain in the final product, and it will cause black spots, black lines, yellowing, and different colors on the product.

[0003] In order to produce qualified products, the existing method is to dry and dehumidify the moisture in the raw materials, which requires a lot of electricity, resulting in increased processing costs; and requires the purchase of a large number of drying equipment, resulting in increased investment. The drying equipment occupies a large amount of production space, and the heat and dust it emits cause the temperature of the production area to rise, thereby wasting the electricity cost of air conditioning.

[0004] Therefore, there is a need in the art for a venting screw head that can effectively remove air from a molten colloid and has greatly reduced costs. Summary of the invention

[0005] The purpose of the utility model is to provide an exhaust screw head 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 head, which includes a meson, an exhaust portion and a connecting portion connected in sequence, the connecting portion is fixed to one end of the screw, an exhaust component is provided on the outside of the exhaust portion, an exhaust gap perpendicular to the axial direction of the exhaust portion is provided in the exhaust component, the exhaust portion and the connecting portion are hollow at the axis center, and an exhaust channel connecting the exhaust gap and the axis center is provided in the exhaust portion.

[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, an outer surface of the exhaust portion is provided with exhaust grooves, and the exhaust grooves are distributed along an axial direction of the exhaust portion.

[0015] In an implementation manner of the first aspect, the exhaust groove is communicated with an inner end of the exhaust slit.

[0016] In one embodiment of the first aspect, each of the exhaust grooves is provided with at least one exhaust channel communicating with the axis.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] (1) The present application provides an exhaust assembly to discharge the air in the molten colloid from the axis of the screw head, thereby preventing the air in the colloid from affecting the product;

[0019] (2) The exhaust valve on the existing injection molding machine can be omitted, reducing equipment costs;

[0020] (3) 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

[0021] Figure 1 It is a schematic diagram of the structure after the screw head is assembled;

[0022] Figure 2 It is a structural schematic diagram of the main structure of the screw head;

[0023] Figure 3 for Figure 2 Schematic diagram of the structure of AA;

[0024] Figure 4 for Figure 2 Schematic diagram of the structure of the medium BB;

[0025] Figure 5 is a schematic structural diagram of the first ring piece;

[0026] Figure 6 is a schematic structural diagram of the second ring piece;

[0027] Figure 7 It is a structural schematic diagram after the screw head is installed at the front end of the screw;

[0028] Figure 8 This is a schematic diagram of the side structure of the first ring piece and the second ring piece in Example 2;

[0029] Fig. 9 This is a schematic diagram of the side structure of the first ring piece and the second ring piece in Example 3.

[0030] In the accompanying drawings, 1 is a screw head, 11 is a meson, 12 is an exhaust portion, 13 is a connecting portion, 14 is an exhaust groove, 15 is an exhaust channel, 2 is a first ring sheet, 21 is an exhaust gap, 3 is a second ring sheet, 31 is a mixing tooth, 4 is a reverse stop ring, 5 is a stop head, 6 is an exhaust hole, 7 is a screw, and 71 is a screw exhaust hole. DETAILED DESCRIPTION

[0031] Unless otherwise defined, the technical or scientific terms used in this specification and claims shall have the ordinary meanings understood by persons having ordinary skills in the technical field to which the present invention belongs. All the values ​​from the lowest value to the highest value listed herein 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.

[0032] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be noted that in the specific description of these embodiments, for the sake of concise description, this specification cannot provide a detailed description of all the features of the actual embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art may modify and replace the embodiments of the present invention, and the resulting embodiments are also within the scope of protection of the present invention.

[0033] In order to remove the water vapor between the molten colloid, the traditional injection molding machine needs to add drying equipment or set an exhaust valve on the shell. When the screw delivers the colloid to the exhaust valve, the gas is discharged from the exhaust valve. In the above two forms, the former requires additional drying equipment, which not only increases the equipment cost, but also increases energy consumption; the latter 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 can be discharged, and the molten colloid cannot be discharged. The structure is relatively complex and the cost is high. The purpose of this application is to provide an exhaust screw head, that is, to collect the gas to the axis of the screw head (i.e., the exhaust hole), thereby avoiding the setting of the exhaust valve. Specifically, the screw head includes a meson, an exhaust part and a connecting part connected in sequence, the connecting part is fixed to one end of the screw, the exhaust part is provided with an exhaust assembly on the outside, the exhaust assembly is provided with an exhaust gap perpendicular to the axial direction of the exhaust part, the exhaust part and the connecting part are hollow at the axis, and the exhaust part is provided with an exhaust channel connecting the exhaust gap and the axis. 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 is relatively high. When the exhaust gap and exhaust channel are set, and as long as the gap depth of the exhaust gap is small, the gas can pass through the exhaust gap and exhaust channel, and finally gather in the hollow part of the axis of the screw head. As long as the axis of the screw is also set to be hollow, the gas can eventually be discharged outward from the 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 injected. The screw head can ensure that there is no air in the injected colloid, thereby improving product quality.

[0034] 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.

[0035] 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.

[0036] In a specific embodiment, the first or second ring piece may be closest to the meson, and the ring piece abuts against the tail end of the meson, and the first or second ring piece may be closest to the screw, and the ring piece abuts against the top end of the screw.

[0037] 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.

[0038] In a specific embodiment, the outer ring of 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.

[0039] In a specific embodiment, the outer surface of the exhaust portion is provided with exhaust grooves, and the exhaust grooves are distributed along the axial direction of the exhaust portion. The exhaust grooves are mainly used to connect the exhaust gaps and the exhaust channel, so that the air in each exhaust gap is collected in the exhaust grooves, and then enters the exhaust channel and finally reaches the axis of the screw head.

[0040] In a specific embodiment, the exhaust groove is communicated with the inner end of the exhaust gap.

[0041] In a specific embodiment, each of the exhaust grooves is provided with at least one exhaust channel connected to the axis.

[0042] Example

[0043] 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 provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiment.

[0044] Example 1

[0045] An exhaust screw head, the structure of which is as follows Figure 1 to Figure 6 As shown, from left to right, the front hexagon wrench position 16, the external threaded portion 17, the front guide 18, the glue portion 19, the meson 11, the exhaust portion 12 and the connecting portion 13 are arranged in an integrated manner. The structures of the front hexagon wrench position 16, the external threaded portion 17, the front guide 18, the glue portion 19, the meson 11, the check ring 4 and the stopper 5 can be referred to the prior application CCN114536688A of the applicant, and will not be repeated in this application. The right end of the screw head 1 is installed at the front end of the screw 7 through the connecting portion 13, as shown in FIG. Figure 7 An exhaust assembly is sleeved on the outside of the exhaust portion 12, and two ends of the exhaust assembly are close to the tail end of the meson 11 and the top end of the screw 7 respectively.

[0046] In this embodiment, the exhaust assembly is composed of 8 groups of exhaust units, such as Figure 1 As shown, each exhaust unit group includes a first ring plate 2 and a second ring plate 3. The structure of the first ring plate 2 is as shown in FIG. Figure 5 As shown, the structure of the second ring piece 3 is as follows Figure 6 As shown, the inner hole diameters of the first ring piece 2 and the second ring piece 3 match the outer diameter of the exhaust portion 12, and four exhaust gaps 21 are provided on the two sides of the first ring piece 2, and the depth of the exhaust gaps 21 is 0.01 mm. The two sides of the second ring piece 3 are smooth and flat, and the first ring piece 2 and the second ring piece 3 are alternately abutted in sequence, the first ring piece 2 is closest to the meson 11, and the second ring piece 3 is closest to the screw 7. The outer ring of the second ring piece 3 is provided with evenly distributed mixing teeth 31.

[0047] The outer surface of the exhaust portion 12 is provided with four exhaust grooves 14, such as Figure 3 , Figure 4 As shown, the exhaust grooves 14 are distributed along the axial direction of the exhaust portion 12, and the exhaust grooves 14 are connected to the inner side end of the exhaust gap 21. Four exhaust channels 15 are also provided on the exhaust portion 12, and each exhaust groove 14 is connected to the exhaust center hole 6 at the axis of the screw head 1 through an exhaust channel 15, and the exhaust center hole 6 is connected to the screw exhaust hole 71 of the screw 7.

[0048] During operation, the molten colloid with gas flows from right to left along with the screw 7. When it flows to the exhaust portion 12, the pressure of the colloid is relatively high, and the gas can enter the exhaust component from the exhaust gap 21, and finally gather in the exhaust groove 14, and then reach the exhaust hole 6 through the exhaust channel 15, and then enter the screw exhaust hole 71, and finally be discharged into the air. Since the depth of the exhaust gap 21 is small, the colloid cannot enter the exhaust gap 21, and the colloid can only flow into the space between the meson 11 and the check ring 4, 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.

[0049] Example 2

[0050] A similar exhaust screw head as in Example 1 is used, except that:

[0051] The first ring sheet 2 and the second ring sheet 3 have the same structure, with one side having an exhaust slit 21 and the other side being smooth and flat. During installation, the side with the exhaust slit 21 abuts against the smooth and flat side of the adjacent ring sheet. Figure 8 As shown, the depth of the exhaust gap 21 is 0.1 mm. The outer edges of the first ring piece 2 and the second ring piece 3 may also be provided with mixing teeth, or may not be provided with mixing teeth. Figure 8 The display shows the state without mixing teeth.

[0052] Example 3

[0053] A similar exhaust screw head as in Example 1 is used, except that:

[0054] The first ring piece 2 and the second ring piece 3 have the same structure, both of which have an exhaust gap 21 on one side. The depth of the exhaust gap 21 on each ring piece is 0.05mm, and the other side is smooth and flat. During installation, the exhaust gaps 21 on the first ring piece 2 and the second ring piece 3 correspond to each other, that is, a 0.1mm exhaust gap is formed, and the smooth and flat sides of the first ring piece 2 and the second ring piece 3 also abut against each other. Fig. 9 The outer edges of the first ring piece 2 and the second ring piece 3 may also be provided with mixing teeth, or may not be provided with mixing teeth. Fig. 9 The display shows the state without mixing teeth.

[0055] 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 head, characterized in that: The screw head includes a meson, an exhaust part and a connecting part which are connected in sequence, the connecting part is fixed to one end of the screw, an exhaust component is provided on the outside of the exhaust part, an exhaust gap perpendicular to the axial direction of the exhaust part is provided in the exhaust component, the exhaust part and the connecting part are hollow at the axis center, and an exhaust channel connecting the exhaust gap and the axis center is provided in the exhaust part.

2. The exhaust screw head 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 head according to claim 2, characterized in that: Exhaust gaps are formed on two side surfaces of the first ring piece, and two side surfaces of the second ring piece are smooth and flat. The first ring piece and the second ring piece are alternately abutted in sequence.

4. The exhaust screw head according to claim 2, characterized in that: The first ring piece and the second ring piece have the same structure and 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. During installation, the side with the exhaust gap of a first ring piece abuts against the smooth and flat side of an 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 head according to claim 2, characterized in that: The first ring piece and the second ring piece have the same structure and 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. During installation, 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 head 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 head 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 head according to claim 1, characterized in that: An outer surface of the exhaust portion is provided with exhaust grooves, and the exhaust grooves are distributed along the axial direction of the exhaust portion.

9. The exhaust screw head according to claim 8, characterized in that: The exhaust groove is communicated with the inner end of the exhaust slit.

10. The exhaust screw head according to claim 8, characterized in that: Each of the exhaust grooves is provided with at least one exhaust channel connected to the axis.

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