Physical micro-foaming injection molding screw and machine barrel assembly

Abstract

The physical micro-foaming injection molding screw and machine barrel assembly comprises a material barrel, a screw and a driving part, the screw is rotationally arranged in the material barrel, the driving part is arranged on one side of the material barrel, one end of the screw penetrates through the material barrel and is connected with the driving end of the driving part, and the other end of the screw is connected with the machine barrel. According to the physical micro-foaming injection molding screw and machine barrel assembly, a foaming injection molding screw fixing structure with the brand of YOUKIN and the model of YX-65 in the existing market is improved, an assembling structure is adopted, the whole body is convenient to assemble, maintain and replace, different screw tails and screw heads are convenient to replace according to different injection molding machine installation requirements, installation and use are flexible, and the cost is low. And the use and installation efficiency of physical micro-foaming is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding screw manufacturing, and in particular relates to a physical micro-foaming injection molding screw and barrel assembly. Background Art

[0002] The physical micro-foaming injection screw and barrel components currently sold on the market, such as the brand YOUKIN, model YX-65, have a fixed overall structure, which is not convenient for assembly, maintenance and replacement. It is not convenient to replace different screw tails and screw heads according to the installation needs of different injection molding machines, and the installation and use are relatively simple.

[0003] The screw of the injection molding machine is a key component of the injection molding machine. The correctness of its structural design and geometric parameter optimization directly affects the quality of the injection molded products and the production volume, and is related to the adaptability of the injection molding machine to different materials.

[0004] In the existing screw barrel structure, there is a heating or cooling function, which is achieved by adding a reinforcing block or setting a circulating cooling channel, but it does not have the dual functions of heating and cooling. In addition, the existing cooling method opens a circulating cooling channel. When pure water is not used, a dirt layer will solidify in the circulating cooling channel after use, which is equivalent to the dirt layer at the bottom of a thermos bottle, causing the cooling effect to be greatly reduced. Ordinary water cannot clean the dirt layer, and the use of corrosive agents will damage the barrel, which will be difficult to clean. Summary of the invention

[0005] The object of the present invention is to provide a physical micro-foaming injection molding screw and barrel assembly to solve the problems raised in the above background technology.

[0006] The present invention provides the following technical scheme: a physical micro-foam injection molding screw and barrel assembly, comprising a barrel, a screw and a driving member, wherein the screw is rotatably arranged inside the barrel, the driving member is arranged on one side of the barrel, one end of the screw penetrates the barrel and is connected to the driving end of the driving member, and is characterized in that: the barrel comprises an outer barrel and an inner barrel which are sleeved with each other, a glass fiber heat insulation sheet is arranged between the outer barrel and the inner barrel, the outer barrel and the inner barrel both comprise an upper semi-cylinder and a lower semi-cylinder, the upper semi-cylinder and the lower semi-cylinder are detachably connected, a water flow cavity which can be passed with water to change the temperature of the barrel is arranged in the barrel body of the outer barrel, a plurality of electromagnetic heaters are equidistantly installed on the outer wall of the inner barrel, and the electromagnetic heaters are staggered and arranged in a triangle, the screw comprises a screw head, a screw tail and a screw body, the screw body is a cylindrical structure, and a spiral is spirally arranged around the circumference of the screw body on the outside. Teeth; the screw head includes a screw head and a screw head portion, a stud is provided at the rear end of the screw head, an internal screw hole is embedded at the front end of the screw head portion, the screw head is screwed in the internal screw hole through the stud, a connecting stud is provided at the rear end of the screw head portion, a connecting internal screw hole is embedded at the front end of the screw body, and the screw head portion is screwed in the connecting internal screw hole through the connecting stud; the screw tail end includes a connecting section and a connecting tail end, a mounting stud is provided at the front end of the connecting section, an mounting internal screw hole is embedded at the rear end, an mounting internal screw hole is embedded at the rear end of the screw body, which is screwed with the mounting stud, and the connecting tail end is screwed with the mounting internal screw hole, a connecting stud is provided at the front end of the connecting tail end, a connecting protrusion 1 and a connecting protrusion 2 are provided at the rear end of the screw head portion, the connecting stud is provided at the rear end of the connecting protrusion 2, the cross-sectional diameter of the connecting protrusion 1 is larger than the cross-sectional diameter of the connecting protrusion 2 and smaller than the cross-sectional diameter of the screw head portion, a channel opening is opened in the connecting section, and convex strips are evenly arranged along the outer wall of the connecting tail portion.

[0007] The inner wall of the outer cylinder is provided with a mounting hole, the outer wall of the inner cylinder is provided with a mounting column, the mounting hole is fixed with the mounting column, the outer cylinders are connected with a fixing plate by bolts, and a sealing strip is installed at the connection between the upper semi-cylinder and the lower semi-cylinder.

[0008] The beneficial effects of the present invention are as follows: the physical micro-foaming injection molding screw and barrel assembly of the present application improves the fixing structure of the foaming injection molding screw of the existing market, such as the brand YOUKIN and model YX-65, and adopts an assembly structure, which is easy to assemble, maintain and replace as a whole, and is convenient for replacing different screw tails and screw heads according to the installation needs of different injection molding machines. The installation and use are flexible, and the installation efficiency of the physical micro-foaming is improved.

[0009] The barrel is configured as a detachable upper half-cylinder and a lower half-cylinder, which is convenient for cleaning the residual wall attachments in the barrel after long-term use. At the same time, the dual functions of heating and cooling are realized by arranging an electromagnetic heater and a water flow cavity. The electromagnetic heaters are staggered to ensure uniform heating as a whole. At the same time, the barrel has a double-layer design of an outer barrel and an inner barrel. The heating block and the circulating cooling channel are respectively arranged on the inner barrel and the outer barrel, which makes it replaceable. Therefore, there is no need to replace the entire screw barrel, which is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the screw structure; Figure 2 It is a schematic diagram of the screw head structure; Figure 3 It is a schematic diagram of the tail end structure; Figure 4 is a schematic diagram of the connecting section structure; Figure 5 Schematic diagram of the screw structure; Figure 6 This is a schematic diagram of the machine barrel structure; Figure 7 It is the cross-sectional view of the barrel; Figure 8 It is the layout diagram of electromagnetic heater; In the figure: screw 1, screw head 2, screw head tip 21, screw head 22, stud 23, inner screw hole 24, connecting stud 25, connecting inner screw hole 26, connecting protrusion 1 27, connecting protrusion 28, screw tail 3, connecting section 31, channel opening 32, connecting tail end 4, convex strip 41, mounting stud 42, mounting inner screw hole 43, screw body 5, spiral teeth 51, outer cylinder 6, inner cylinder 61, upper semi-cylinder 62, lower semi-cylinder 63, electromagnetic heater 64, mounting column 65, water flow cavity 66, fixing plate 67, sealing strip 68. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] See also Figure 1-5 The technical solution provided by the present invention is: a physical micro-foaming injection molding screw and barrel assembly, including a screw 1, wherein the screw 1 includes a screw head 2, a screw tail 3 and a screw body 5, and the screw body 5 is a cylindrical structure, and spiral teeth 51 are spirally arranged around the circumference of the screw body 5. It is a prior art, and all screws on the current market adopt this structure, so it will not be described in detail.

[0013] In view of the physical micro-foaming injection screw and barrel components currently sold on the market, such as the brand YOUKIN and model YX-65, the overall structure is fixed, which is not convenient for assembly, maintenance and replacement, and it is not convenient to replace different screw tails and screw heads according to the installation needs of different injection molding machines, and the installation and use are relatively simple. This application has made improvements, and the screw head and screw tail are screwed on the front and rear ends of the screw respectively, and the screw tail is connected and installed through a connecting section. The structure is reasonable, the overall maintenance and assembly are convenient, and different screw tails and screw heads can be easily replaced according to the installation needs of different injection molding machines, which improves flexibility.

[0014] The specific structure of the present application is that: the screw head 2 includes a screw head tip 21 and a screw head 22, a screw head tip 21 is provided with a stud 23 at the rear end, and an inner screw hole 24 is embedded at the front end of the screw head 22. The screw head tip 21 is screwed into the inner screw hole 24 through the stud 23, forming a structure in which the screw head tip 21 is screwed into the screw head 22, thereby realizing the overall structure of the screw head 2, a connecting stud 25 is provided at the rear end of the screw head 22, and a connecting inner screw hole 26 is embedded at the front end of the screw body 5, and the screw head 22 is screwed into the connecting inner screw hole 26 through the connecting stud 25; thereby forming a structure in which the screw head 2 is screwed into the screw body 5. The screw head 22 is provided with a connecting protrusion 1 27 and a connecting protrusion 2 28 at the rear end, and the connecting stud 25 is provided at the rear end of the connecting protrusion 2 28. The cross-sectional diameter of the connecting protrusion 1 27 is larger than the cross-sectional diameter of the connecting protrusion 2 28 and smaller than the cross-sectional diameter of the screw head 22. The interior of the screw head and the screw body 5 are convenient for assembly and maintenance, and it is also convenient to replace screw heads of different types with the same screw connection structure according to the installation and use requirements of different injection molding machines.

[0015] The screw tail end 3 includes a connecting section 31 and a connecting tail end 4. The front end of the connecting section 31 is provided with a mounting stud 42, and the connecting section 31 is provided with a passage opening 32. The rear end of the connecting section 31 is embedded with an internal screw hole 43, and the rear end of the screw body 5 is embedded with an internal screw hole 24, which is screwed with the mounting stud 42, so that the connecting section 31 is conveniently screwed on the rear end of the screw body 5 to form an assembly structure, and the connecting tail is conveniently connected. The mounting internal screw hole 43 is screwed on the connecting tail end 4, and convex strips 41 are evenly arranged along the outer wall of the connecting tail. The front end of the connecting tail end 4 is provided with a connecting tail stud 42. The above-mentioned connection section 31 and the screw body 5, and the connecting tail end 4 and the connecting section 31 are convenient for assembly and maintenance, and are also convenient for replacement according to the installation and use needs of different injection molding machines, and are flexible to use.

[0016] The barrel includes an outer barrel 6 and an inner barrel 61 which are connected to each other. This design helps to achieve the temperature control and cooling function of the barrel and ensure the stability and efficiency of the extrusion process. A glass fiber heat insulation sheet is arranged between the outer barrel 6 and the inner barrel 61 to reduce heat loss and improve the accuracy of temperature control. The outer cylinder 6 and the inner cylinder 61 both include an upper semi-cylinder 62 and a lower semi-cylinder 63, and the upper semi-cylinder 62 and the lower semi-cylinder 63 are detachably connected, which is convenient for cleaning the wall attachments remaining in the barrel after long-term use, and is convenient for repairing problems such as screw failure in the later stage.

[0017] The outer wall of the inner cylinder 61 is equidistantly mounted with a plurality of electromagnetic heaters 64 , which are staggered and arranged in a triangular shape. The triangular arrangement saves the number of electromagnetic heaters 64 and does not affect the overall heating of the inner cylinder 61 .

[0018] The outer cylinder 6 is provided with a water flow cavity 66 in the cylinder body, through which water can flow to change the temperature of the cylinder body.

[0019] The inner wall of the outer cylinder 6 is provided with a mounting hole, the outer wall of the inner cylinder 61 is provided with a mounting column 65, the mounting hole and the mounting column 65 cooperate to fix the outer cylinder 6 through bolts and a fixing plate 67, and a sealing strip 68 is installed at the connection between the upper semi-cylinder 62 and the lower semi-cylinder 63.

[0020] The working principle of the screw of the present application is as follows: the screw head is assembled according to the use requirements, the screw head tip is screwed on the screw head to form the screw head, and then the screw head is screwed on the front end of the screw body. The connecting section is screwed on the rear end of the screw body, and the connecting tail end is screwed on the rear end of the connecting section.

[0021] This application develops a screw assembly for physical micro-foaming based on PP and PE. In order to improve the strength-to-weight ratio, the original low porosity of 20-30% is prone to quality problems such as surface vortex flow marks, silver streaks, surface bubbles and blow-throughs, as well as defects such as poor flex crack resistance and difficulty in processing. Now, the product is required to reach a porosity of 50-60%, while the strength remains unchanged, and even the structural strength is enhanced, and the foaming rate needs to be greatly improved. After researching and analyzing the process characteristics of PP and PE with the addition of modifiers and other related auxiliary materials in the plasticization process, the project team sorted out, analyzed and summarized the existing problems. At the same time, in order to solve the problems of air leakage, pressure maintenance, and prevention of material backflow during injection molding, corresponding implementation plans are made through solutions such as two-stage compression, secondary extrusion, and two-stage check, and the scheme verification, sample trial production, and testing are carried out.

[0022] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A physical micro-foam injection molding screw and barrel assembly, comprising a barrel, a screw and a driving member, wherein the screw is rotatably arranged inside the barrel, the driving member is arranged on one side of the barrel, one end of the screw penetrates the barrel and is connected to the driving end of the driving member, characterized in that: The barrel comprises an outer barrel and an inner barrel which are sleeved with each other, a glass fiber heat insulation sheet is arranged between the outer barrel and the inner barrel, the outer barrel and the inner barrel each comprise an upper semi-cylinder and a lower semi-cylinder, the upper semi-cylinder and the lower semi-cylinder are detachably connected, a water flow cavity which can flow water to change the temperature of the barrel is arranged in the barrel body, a plurality of electromagnetic heaters are equidistantly installed on the outer wall of the inner barrel, and the electromagnetic heaters are staggered and arranged in a triangular shape, the screw comprises a screw head, a screw tail and a screw body, the screw body is a cylindrical structure, and spiral teeth are spirally arranged around the circumference of the screw body on the outside; the screw head comprises a screw head and a screw head portion, a stud is arranged at the rear end of the screw head, an inner screw hole is embedded at the front end of the screw head portion, and the screw head is screwed into the inner screw through the stud A hole is provided at the rear end of the screw head, and a connecting stud is embedded in the front end of the screw body. The screw head is screwed in the connecting internal screw hole through the connecting stud; the screw tail end includes a connecting section and a connecting tail end, the front end of the connecting section is provided with an installation stud, the rear end is embedded with an installation internal screw hole, the rear end is embedded with an installation internal screw hole, which is screwed with the installation stud, and the connecting tail end is screwed with the installation internal screw hole, and the front end of the connecting tail end is provided with a connecting stud, and the rear end of the screw head is provided with a connecting protrusion 1 and a connecting protrusion 2, the connecting stud is arranged at the rear end of the connecting protrusion 2, the cross-sectional diameter of the connecting protrusion 1 is larger than the cross-sectional diameter of the connecting protrusion 2 and smaller than the cross-sectional diameter of the screw head, the connecting section is provided with a channel opening, and convex strips are evenly arranged along the outer wall of the connecting tail.

2. The physical micro-foaming injection molding screw and barrel assembly according to claim 1, characterized in that: The inner wall of the outer cylinder is provided with a mounting hole, the outer wall of the inner cylinder is provided with a mounting column, the mounting hole is fixed with the mounting column, the outer cylinders are connected with a fixing plate by bolts, and a sealing strip is installed at the connection between the upper semi-cylinder and the lower semi-cylinder.

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