Mixing component and injection molding machine with same

Abstract

The invention belongs to the technical field of injection molding, and relates to a mixing component and an injection molding machine with the same. The mixing component comprises a mixing barrel body and a mixing and shunting inner barrel; a melting runner is arranged in the mixing barrel body in the axial direction, one end of the mixing runner is a feeding end, and the other end of the mixing runner is a discharging end; the mixing and shunting inner barrel is arranged on the inner wall of the melting runner; wherein the inner surface of the mixing and shunting inner cylinder is provided with net-shaped columns which are stacked and arranged along the axial direction. The designed mixing and shunting inner barrel aims at improving the flowing activity of molten plastic, so that mixing is more uniform, and the mixing effect is enhanced; the net-shaped columns designed in the mixing and shunting inner barrel can shear the materials, the materials are layered through the net-shaped columns, and the speed difference between vortex and fluid is treated, so that the overall homogenization can be realized. When the mixing component disclosed by the invention is used for mixing a material with a certain solid-phase material, a better effect can be exerted, so that the color mixing and plasticizing effects of the material are more excellent.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, and in particular to a mixing component and an injection molding machine having the same. Background Art

[0002] During the injection molding process, materials (raw materials and masterbatches) enter the injection molding machine from the feed port and are transferred through the mixing channel. The materials gradually melt under the friction heat generated by the screw rotation and the heat provided by the external heating ring. After further mixing and plasticizing in the metering section of the mixing channel, they accumulate in the screw head and are finally quickly injected into the mold cavity from the nozzle head. During this process, if the plasticization is abnormal, it will cause appearance problems on the product surface, resulting in abnormalities such as unqualified product appearance quality.

[0003] In the prior art, the main causes of abnormal plasticization include poor material flow activity, uneven mixing, and the like. Summary of the invention

[0004] The purpose of the present invention is to provide a mixing component and an injection molding machine having the same, aiming to solve the problems of poor mixing flow activity and uneven mixing in the existing material mixing technology.

[0005] In order to solve the above technical problems, the object of the present invention is achieved through the following technical solutions: providing a mixing component, comprising:

[0006] The mixing barrel body has a melting flow channel arranged in the axial direction inside, one end of the mixing flow channel is a feeding end, and the other end is a discharging end;

[0007] A mixing and diverting inner cylinder is arranged on the inner wall of the melting flow channel;

[0008] The inner surface of the mixing and diverting inner cylinder is provided with mesh columns stacked in the axial direction, and the mesh columns are used to shear the material when the material flows through the mixing flow channel.

[0009] Furthermore, the mesh shape of the mesh column is polygonal.

[0010] Furthermore, the mesh shape of the mesh column is rhombus.

[0011] Furthermore, the angle range of the inner angle of the rhombus toward the melting flow channel is 30° to 100°.

[0012] Furthermore, the mixing cylinder body comprises a rear axle seat, a sleeve and a nozzle head which are connected in sequence, and the mixing flow-dividing inner cylinder is arranged on the inner wall of the sleeve.

[0013] Furthermore, the rear axle seat, the sleeve and the nozzle head are fixed by threaded sleeve connection.

[0014] Furthermore, the molten flow channel comprises a feed section, a conveying section, a compression section and a metering section which are connected in sequence, and the mixing and diverting inner cylinder is located in the compression section.

[0015] Furthermore, the mixing component also includes a screw disposed in the molten flow channel, and a screw groove of the screw is used to drive the material to be transported along the molten flow channel when the screw rotates.

[0016] Furthermore, the compression ratio of the screw is in the range of 2.1 to 2.3.

[0017] An embodiment of the present invention further provides an injection molding machine, comprising the mixing component as described above.

[0018] Compared with the prior art, the end cover structure of the present invention has at least the following beneficial effects:

[0019] The mixing and diverting inner cylinder is designed to increase the flow activity of the molten plastic, making the mixing more uniform and enhancing the mixing effect. The mesh columns designed in the mixing and diverting inner cylinder can shear the material, and the material is processed by stratification, eddy current and velocity difference between fluids through the mesh columns to achieve overall homogenization.

[0020] When the mixing component of the present invention is used to mix materials with a certain solid phase material, a better effect can be exerted, so that the color mixing and plasticizing effects of the materials are more excellent.

[0021] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the three-dimensional structure of a mixing component provided in an embodiment of the present invention.

[0024] Figure 2 A schematic plan view of the structure of a mixing component provided in an embodiment of the present invention.

[0025] Figure 3 A schematic structural diagram of a mixing component from a first explosion perspective provided in an embodiment of the present invention.

[0026] Figure 4A schematic structural diagram of a mixing component from a second explosion perspective provided by an embodiment of the present invention.

[0027] Figure 5 The embodiment of the present invention provides Figure 2 Schematic diagram of the stereoscopic view of the middle section AA.

[0028] Figure 6 The embodiment of the present invention provides Figure 2 Schematic diagram of the plan view of the middle section AA.

[0029] Figure 7 A schematic diagram of the structure of a screw provided in an embodiment of the present invention.

[0030] Figure 8 A comparison chart of color difference values ​​between the present invention and the prior art provided in an embodiment of the present invention.

[0031] Fig. 9 A gloss comparison diagram of the present invention and the prior art provided for an embodiment of the present invention.

[0032] Description of the symbols in the figure:

[0033] 1. Rear axle seat; 2. Sleeve; 3. Nozzle head; 4. Mixing and diverting inner cylinder; 41. Mesh column; 5. Melting flow channel; 6. Screw. DETAILED DESCRIPTION

[0034] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0035] In the description of the present invention, it should be clarified that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, but are not necessarily used to describe a specific order or sequence; the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", "horizontal", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, and do not mean that the referred device or element must have a specific direction or position, and therefore cannot be understood as a limitation on the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] See also Figures 1 to 7 , an embodiment of the present invention provides a mixing component, comprising:

[0038] The mixing cylinder body has a melting flow channel 5 arranged axially inside, one end of the mixing flow channel is a feeding end, and the other end is a discharging end;

[0039] The mixing and diverting inner cylinder 4 is arranged on the inner wall of the melting flow channel 5;

[0040] The inner surface of the mixing and diverting inner cylinder 4 is provided with mesh columns 41 stacked in the axial direction, and the mesh columns 41 are used to shear the material when the material flows through the mixing flow channel.

[0041] In this embodiment, the shape of the mixing barrel body is a long cylindrical structure, and the melting flow channel 5 is arranged along the long axial direction of the mixing barrel body. The material enters the melting flow channel 5 from the feed end, and can move forward along the melting flow channel 5 through the rotation of the screw 6. When passing through the inside of the mixing diversion inner barrel 4, it can be sheared by the mesh column 41, and gradually melted under the action of the friction heat generated by the shearing and the heat provided by the external heating element. The melted material reaches the discharge end and can be injected into the mold cavity of the next link.

[0042] In this embodiment, the mixing and diverting inner cylinder 4 is used to increase the flow activity of the molten plastic, make its mixing more uniform, and enhance its mixing effect; the mesh columns 41 designed in the mixing and diverting inner cylinder 4 can shear the material, and the material is subjected to stratification, eddy current and velocity difference processing between fluids through the mesh columns 41, so as to achieve overall homogenization.

[0043] In this embodiment, when the mixing component of the present invention is used to mix materials with a certain solid phase material, better effects can be exerted, so that the color mixing and plasticizing effects of the materials are more excellent.

[0044] In one embodiment, the mesh shape of the mesh column 41 is polygonal.

[0045] In this embodiment, the polygonal mesh design of the mesh columns 41 helps to improve the shearing efficiency of the material and reduce the pressure loss of the material during the mixing process. In addition, the arrangement and spacing of the mesh columns 41 can be adjusted according to the characteristics of different materials to achieve a better mixing effect.

[0046] In one embodiment, the mesh shape of the mesh column 41 is a rhombus; the inner angle of the rhombus toward the melting flow channel 5 is less than or equal to 100°.

[0047] In this embodiment, in order to further improve the shearing effect, the mesh shapes of these mesh columns 41 are designed to be diamond-shaped. In particular, the inner angle of these diamond-shaped meshes toward the melting flow channel 5 is designed to be less than 90 degrees. Such a design can further optimize the shearing and mixing effects of different materials, thereby improving the quality of the final product.

[0048] Specifically, the preferred angle range of the inner angle of the rhombus is 30° to 100°. Within this preferred range, the larger the inner angle of the rhombus, the longer the shearing time for the material, and the smaller the inner angle of the rhombus, the shorter the shearing time for the material; thus, the greater the proportion of solid phase material in the material, the longer the shearing time required for better mixing, and therefore the larger the selected inner angle of the rhombus; conversely, the smaller the proportion of solid phase material in the material, the smaller the selected inner angle of the rhombus.

[0049] In one embodiment, the mixing barrel body comprises a rear axle seat 1 , a sleeve 2 and a nozzle head 3 which are connected in sequence, and the mixing flow-dividing inner barrel 4 is arranged on the inner wall of the sleeve 2 .

[0050] In this embodiment, the rear axle seat 1, the sleeve 2 and the nozzle head 3 are all hollowed in the axial direction to form a mixing flow channel after connection. The rear axle seat 1 serves as the support point of the entire mixing barrel body, ensuring the stability and durability of the mixing barrel body; the sleeve 2 is immediately followed by the rear axle seat 1, which not only provides the necessary structural strength for the mixing barrel body, but also has a key component specially arranged on its inner wall-the mixing diversion inner barrel 4. The design of the mixing diversion inner barrel 4 cleverly utilizes the inner wall space of the sleeve 2. Through its unique structure, it can effectively divert and mix the materials, thereby improving the mixing efficiency and quality. The nozzle head 3 is located at the end of the mixing barrel body, which is responsible for discharging the mixed materials in an appropriate manner, ensuring the uniformity and consistency of the materials. The design of the entire mixing barrel body takes into account the fluidity of the materials and the convenience of operation, making the entire mixing process more efficient and precise.

[0051] like Figure 3 and Figure 4 In one embodiment, the rear axle seat 1, the sleeve 2 and the nozzle head 3 are fixed by threaded sleeve connection.

[0052] In this embodiment, in order to ensure the stability and durability between the rear axle seat 1, the sleeve 2 and the nozzle head 3, the rear axle seat 1, the sleeve 2 and the nozzle head 3 are fixed by threaded sleeve connection. This connection method is simple and reliable, and can withstand various pressures and wear during the mixing process.

[0053] like Figure 6As shown, in one embodiment, the melt flow channel 5 includes a feed section a, a feeding section b, a compression section c and a metering section d which are connected in sequence, and the mixing and diverting inner cylinder 4 is located in the compression section.

[0054] In the present embodiment, in the design of the melt flow channel 5, the melt flow channel 5 is segmented into a feed section, a feeding section, a compression section and a metering section which are connected in sequence, and these sections together constitute the entire flow channel system. Among them, it is particularly noteworthy that the mixing and diverting inner cylinder 4 is cleverly placed in the compression section. Such a layout plays a vital role in the uniform mixing of materials and the stable transmission of pressure.

[0055] In one embodiment, the mixing component further includes a screw 6 disposed in the molten flow channel 5 , and a screw groove of the screw 6 is used to drive the material to be transported along the molten flow channel 5 when the screw 6 rotates.

[0056] In this embodiment, the mixing component further includes a screw 6 disposed in the molten flow channel 5, and the screw 6 has a screw groove. When the screw 6 rotates in the molten flow channel 5, the screw groove can effectively drive the material to be transported along the molten flow channel 5, thereby ensuring uniform mixing and transportation of the material during the mixing process.

[0057] Furthermore, the rotational power of the screw 6 is provided by the motor through the transmission device, which ensures the stable rotation and precise control of the screw 6. In addition, the screw groove design of the screw 6 has a specific depth and angle to adapt to the characteristics of different materials, thereby optimizing the mixing effect. At the end of the screw 6, a check device is usually provided to prevent the material from flowing back when the screw 6 stops rotating. The design of the entire mixing component is intended to improve the production efficiency and product quality of the injection molding machine while reducing energy consumption and maintenance costs.

[0058] like Figure 7 As shown, in one embodiment, the compression ratio of the screw 6 is in the range of 2.1 to 2.3.

[0059] In this embodiment, the compression ratio refers to the ratio of the volume of the first groove (located in the feeding section) of the screw 6 to the volume of the last groove (located in the metering section). The groove of the screw 6 located in the feeding section is deeper, and the groove located in the metering section is shallower. The value of the compression ratio will affect the change of the temperature of the compression section. A high change in the temperature of the compression section will affect the mixing effect. Therefore, on the basis of using the mixing and diverting inner cylinder 4 of the present invention, it is necessary to specifically optimize the compression ratio of the screw 6.

[0060] Specifically, in the process of applying the mixing component of the present invention, an in-depth follow-up analysis was conducted on the machine with abnormally high temperature in the compression section. The results showed that the main reason for the increase in temperature in the compression section is that the large amount of heat generated by the screw 6 when it runs at high speed in this area is difficult to dissipate, resulting in abnormalities in the production process. Further analysis pointed out that the root of the problem is that the compression ratio of the currently used screw 6 is too large. After replacing the screw 6 and adjusting the compression ratio, the analysis was conducted again. Finally, it was determined that when the compression ratio is in the range of 2.1 to 2.3, the temperature of the compression section can be maintained at a normal level. For details, please refer to Figure 7 In the exemplary screw 6, the volume of the first groove of the screw 6 is f, and the volume of the last groove is e. When the ratio of f / e is 2.1 to 2.3, the temperature of the compression section can be maintained at a normal level. Preferably, in a more specific embodiment, the ratio of f / e is set to 2.2.

[0061] More specifically, in addition to the compression ratio design of the screw 6, the selection of the screw 6 also has an important influence on the plasticizing capacity; on the basis of using the mixing and diverting inner barrel 4 of the present invention, the present invention analyzes the plasticizing capacity of screws 6 of different structures matched with the mixing and diverting inner barrel 4 and finds that the high mixing screw> double diamond screw> H-type screw. In actual production, the screw 6 with stronger plasticizing capacity has a particularly significant color mixing effect. Therefore, studying and solving the shear heat while satisfying the mixing effect is a key research direction. By performing shear heat analysis on screws 6 of different structures, it is found that the high mixing screw has a 15% higher shear heat than the H-type screw and 8.7% higher than the double diamond screw. Therefore, the selection of a high mixing screw and the mixing and diverting inner barrel 4 of the present invention can achieve a better mixing effect.

[0062] The present invention compares and verifies the mixing component of the present invention with the prior art. Specifically, the same processing parameters are taken for production verification and comparison. Under the same production conditions of machine molds and auxiliary equipment, the mixing component of the prior art and the mixing component of the present invention are used to compare and verify the color difference value and smoothness. The verification results are as follows: Figure 8 and Fig. 9 As shown, it can be seen that the color difference value and smoothness obtained by using the mixing component of the present invention are improved.

[0063] Furthermore, based on the use of the mixing component of the present invention, the color streak and light transmittance of the product are improved, and the sol back pressure can be reduced and the sol speed can be increased, thereby improving the efficiency of the sol. The specific analysis is as follows:

[0064] 1. Verify the injection molding machine for panels with frequent color patterns, and analyze a certain product as an example:

[0065] Assuming that the temperature of screw 6 is 180-210-215-220-225-225°C, the injection speed is 85-95-80-35-20-10%, the injection pressure is 120-135-135-85-65-35 bar, the melt back pressure is 12-12-12-12 bar, and the melt pressure is 100 bar. The color difference value and glossiness of the mixing component obtained in the prior art are as follows in Table 1:

[0066] Table 1

[0067] 1 2 3 4 5 6 7 8 9 10 Δb -0.66 -0.63 -0.64 -0.66 -0.63 -0.65* -0.67 -0.65 -0.67 -0.65 ΔE 0.78 0.73 0.72 0.73 0.64 0.74 0.76 0.74 0.75 0.74 Glossiness 100 100 103 104 104 102 100 103 104 103

[0068] Suppose the temperature of screw 6 is 180-210-215-220-220-225°C, the injection speed is 75-85-70-45-20-10%, the injection pressure is 125-125-130-115-80-50bar, the melt back pressure is 9-9-9-9bar, and the melt pressure is 85bar. The color difference value and glossiness of the mixing component of the present invention are as shown in Table 2:

[0069] Table 2

[0070] 1 2 3 4 5 6 7 8 9 10 Δb -0.48 -0.47 -0.45 -0.44 -0.50 -0.51 -0.48 -0.47 -0.46 -0.50 ΔE 0.69 0.71 0.70 0.68 0.69 0.69 0.66 0.61 0.63 0.66 Glossiness 111 112 111 111 110 114 111 110 112 110

[0071] By comparing the data in Table 1 and Table 2, it can be seen that the mixed component of the present invention has better color difference and glossiness under lower sol pressure conditions.

[0072] An embodiment of the present invention further provides an injection molding machine, comprising the mixing component as described above.

[0073] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous technical features can be freely combined and superimposed.

[0074] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A mixing component, characterized in that: include: The mixing barrel body has a melting flow channel arranged in the axial direction inside, one end of the mixing flow channel is a feeding end, and the other end is a discharging end; A mixing and diverting inner cylinder is arranged on the inner wall of the melting flow channel; The inner surface of the mixing and diverting inner cylinder is provided with mesh columns stacked in the axial direction, and the mesh columns are used to shear the material when the material flows through the mixing flow channel.

2. The mixing component according to claim 1, characterized in that The mesh shape of the mesh column is polygonal.

3. The mixing component according to claim 1 or 2, characterized in that: The mesh shape of the mesh column is rhombus.

4. The mixing component according to claim 3, characterized in that The angle range of the inner angle of the rhombus toward the melting flow channel is 30° to 100°.

5. The mixing component according to claim 1, characterized in that The mixing cylinder body comprises a rear axle seat, a sleeve and a nozzle head which are connected in sequence, and the mixing flow-dividing inner cylinder is arranged on the inner wall of the sleeve.

6. The mixing component according to claim 5, characterized in that The rear axle seat, the sleeve and the nozzle head are fixed by threaded sleeve connection.

7. The mixing component according to claim 1, characterized in that The molten flow channel comprises a feed section, a conveying section, a compression section and a metering section which are connected in sequence, and the mixing and diverting inner cylinder is located in the compression section.

8. The mixing component according to claim 1, characterized in that It also includes a screw rod arranged in the molten flow channel, and the screw groove of the screw rod is used to drive the material to be transported along the molten flow channel when the screw rod rotates.

9. The mixing component according to claim 8, characterized in that The compression ratio of the screw is in the range of 2.1 to 2.

3.

10. An injection molding machine, characterized in that: The invention comprises the mixing component according to any one of claims 1 to 9.

Images