Plasticizing unit and injection molding machine comprising same
By adopting a segmented screw structure in the injection molding machine, the problem of small proportion of melt adhesive and long retention time in the production of small glue parts is solved, which achieves higher production efficiency and stability, and reduces energy consumption.
Patent Information
- Application Number
- CN202422151355.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-09-02
AI Technical Summary
When existing injection molding machines produce small glue parts, the melt adhesive accounts for a small proportion and stays for a long time, resulting in the parts being prone to yellowing and poor stability.
By changing the original entire screw structure to a segmented structure, including screws and connecting rods, the proportion of melt adhesive in large molds and small glue contents is increased, and the retention time of the material is reduced.
The stable production of parts with small adhesives in large molds has been achieved, with the proportion of melt adhesives increased from 2%-4% to more than 20%, the production efficiency has been improved by more than 5%, the switching loss has been reduced by more than 30%, and the energy consumption has been reduced by more than 10%.
Smart Images
Figure CN222946142U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of injection molding, in particular to a plasticizing unit and an injection molding machine comprising the same. Background Art
[0002] When processing with injection molding machines, there are situations where large machine tools are used to produce parts with small amounts of glue. When producing such parts, there are problems such as poor consistency and easy carbonization of materials. Some precision parts of air-conditioning products also have similar problems, which are common problems. Precision motion parts are core components, and their quality will affect the operation of the entire machine. For example, the fracture and color difference of crankshaft and connecting rod parts account for about 10% of the after-sales abnormality ratio; the production consistency of transmission rod parts in different batches is low, which affects the closure of the entire machine. Abnormal parts are mainly products with a small proportion of melt glue (the proportion of melt glue refers to the ratio of the volume of material required for part production to the total volume of material melted during equipment production) and a long residence time (the residence time refers to the time required for transmission from the feed port to the nozzle, which is the residence time of the plastic in the barrel). They cannot meet the standard process requirements that the amount of glue per mold accounts for 20% to 80% of the amount of melt glue in the equipment. The material is heated for a long time, and the parts are prone to yellowing and low batch stability. Utility Model Content
[0003] The utility model aims to provide a plasticizing unit and an injection molding machine including the same, so as to solve the technical problems existing in the prior art in producing small-volume parts, such as small proportion of molten glue, long residence time, easy yellowing and poor stability.
[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0005] The utility model provides a plasticizing unit, comprising a machine nozzle, a middle connection, a machine barrel, a screw, a connecting rod, and a connecting barrel; wherein:
[0006] The connecting sleeve is sleeved on one end of the barrel;
[0007] The connecting rod is arranged in the connecting cylinder;
[0008] The screw is arranged in the barrel, and one end of the screw extends into the connecting barrel and is connected to the connecting rod;
[0009] The middle connection is arranged at the end of the barrel and connected to the machine nozzle;
[0010] The connecting cylinder and the barrel are provided with feed ports.
[0011] The plasticizing unit provided by the utility model configures an original whole screw structure into a segmented structure, including a screw and a connecting rod; through the segmented screw structure, the proportion of melt glue of large mold and small glue amount parts is increased and the material retention time is reduced.
[0012] As a further improvement of the present utility model, the feed port is located at the front end of the overlapped portion between the connecting cylinder and the barrel.
[0013] As a further improvement of the utility model, it also includes a hopper installed at the feed inlet.
[0014] As a further improvement of the present invention, the inner cavity of the connecting cylinder includes a first chamber and a second chamber arranged in a stepped form; the barrel is inserted into the first chamber; and the connecting rod is inserted into the second chamber.
[0015] As a further improvement of the present invention, a limiting convex ring is arranged in the first chamber; the tail end of the barrel has a first step portion and a second step portion; the diameter of the first step portion is equal to the inner diameter of the limiting convex ring; the diameter of the second step portion is equal to the diameter of the first chamber; the barrel diameter is larger than the first chamber diameter; and it also includes a locking nut, a threaded section is arranged on the first step portion, the locking nut is screwed on the first step portion, and abuts against the limiting convex ring.
[0016] As a further improvement of the present invention, a sealing structure is provided between the head end of the connecting rod and the inner wall of the second chamber.
[0017] As a further improvement of the utility model, the screw comprises a connecting section, a metering section, a plasticizing section and an injection section which are arranged in sequence; the connecting section is a bare rod structure and is located between the feed port and the first chamber.
[0018] As a further improvement of the present invention, the connecting rod and the screw rod are connected via a slot or a thread.
[0019] The plasticizing unit of the utility model uses a scientific injection molding method to confirm the molding parameters (pressure, position, speed, etc.) after the transformation, so as to ensure good product production consistency and stable equipment operation.
[0020] The utility model provides an injection molding machine, which comprises the plasticizing unit.
[0021] As a further improvement of the utility model, it also includes an injection seat assembly and an injection cylinder assembly supported at the bottom of the plasticizing unit; and also includes a pre-plasticizing assembly installed at the rear end of the plasticizing unit for driving the plasticizing unit to move.
[0022] The injection molding machine of the utility model reduces the total amount of melt glue of the equipment by modifying the structure of the plasticizing unit while keeping the clamping tonnage and mold capacity of the equipment unchanged, thereby achieving stable production of large machine tools and small-volume products. The proportion of melt glue for large molds and small-volume parts is increased from 2%-4% to more than 20%, the production efficiency is improved by more than 5%, the switching loss is reduced by more than 30%, and the energy consumption is reduced by more than 10%. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 It is a structural schematic diagram of the injection molding machine of the utility model;
[0025] Figure 2 It is a structural schematic diagram of a plasticizing unit in the prior art;
[0026] Figure 3 It is a structural schematic diagram of the plasticizing unit of the utility model;
[0027] Figure 4 It is a structural schematic diagram of the barrel in the plasticizing unit of the utility model;
[0028] Figure 5 It is a left view of the barrel in the plasticizing unit of the utility model;
[0029] Figure 6 yes Figure 4 Middle AA section view;
[0030] Figure 7 yes Figure 4 Middle BB section view;
[0031] Figure 8 It is a structural schematic diagram of the connecting cylinder in the plasticizing unit of the utility model;
[0032] Fig. 9 It is a left view of the connecting cylinder in the plasticizing unit of the utility model;
[0033] Fig.10 yes Figure 8 Middle CC section view;
[0034] Fig.11 yes Figure 8 Middle DD section view;
[0035] Fig.12 yes Figure 8 Middle EE section view;
[0036] Fig.13 yes Figure 8 Middle F direction schematic diagram;
[0037] Fig.14 It is a partial structural schematic diagram of the screw in the plasticizing unit of the utility model;
[0038] Fig.15 It is a partial structural schematic diagram of the screw rod in the plasticizing unit of the utility model facing the central connection side;
[0039] Fig.16 It is a schematic diagram of the end surface structure of the screw rod facing the connecting rod in the plasticizing unit of the utility model;
[0040] Fig.17 yes Fig.14 Middle I is a partial enlarged view;
[0041] Fig.18 It is a structural schematic diagram of the connecting rod in the plasticizing unit of the utility model;
[0042] Fig.19 It is a left view of the connecting rod in the plasticizing unit of the utility model;
[0043] Fig. 20 yes Fig.18 Middle FF section view;
[0044] Fig.21 It is a schematic diagram of the intermediate connection structure of the plasticizing unit of the utility model;
[0045] Fig. 22 It is a structural schematic diagram of a machine nozzle in a plasticizing unit of the utility model.
[0046] In the figure, 1 is the machine nozzle; 2 is the center connection; 3 is the machine barrel; 4 is the screw; 5 is the connecting rod; 6 is the connecting barrel; 7 is the feed port; 8 is the hopper; 9 is the first chamber; 10 is the second chamber; 11 is the limiting convex ring; 12 is the first step portion; 13 is the second step portion; 14 is the locking nut; 15 is the sealing structure; 16 is the connecting section; 17 is the metering section; 18 is the plasticizing section; 19 is the injection molding section; 100 is the plasticizing unit; 200 is the injection seat assembly; 300 is the injection cylinder assembly; 400 is the pre-plasticizing assembly. DETAILED DESCRIPTION
[0047] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.
[0048] like Figure 3-Figure 22 As shown, the utility model provides a plasticizing unit, including a nozzle 1, a middle connection 2, a barrel 3, a screw 4, a connecting rod 5, and a connecting barrel 6; wherein:
[0049] The connecting tube 6 is sleeved on one end of the barrel 3, and the two can be connected by screwing, plugging or clamping; in order to ensure the connection strength, the overlapping part between the two, that is, the insertion depth should reach at least 1 / 3 of the overall length of the barrel 3.
[0050] The connecting rod 5 is arranged in the connecting tube 6; in this embodiment, Fig.18 As shown, the connecting rod 5 is a bare rod structure, used to drive the screw rod 4 to move; and the connecting rod 5 is provided with a threaded connection cavity at one end facing the screw rod 4; Fig.19 As shown, the threaded connection cavity at the end of the connecting rod 5 is a gear-type connection cavity. This structure can achieve connection while also preventing rotation.
[0051] like Fig. 20 , which is a schematic structural diagram of the other end of the connecting rod 5, which is used to connect with the pre-plastic component 400 that drives its movement.
[0052] like Fig.14 -like Fig.17 As shown, the screw 4 is arranged in the barrel 3, and one end thereof extends into the connecting barrel 6 and is connected to the connecting rod 5; the length of the exposed part of the barrel 3 plus the connecting barrel 6 is equal to the length of the plasticizing unit on the original injection molding machine, as shown in FIG. Figure 2 As shown in the figure, it is a schematic diagram of the structure of the plasticizing unit in the prior art; by setting the original whole screw structure into a split part, one part is the screw 4, and the other part is the connecting rod 5 of the polished rod, the production stability of large molds and small glue parts is improved under the condition that the clamping tonnage and mold capacity size of the equipment remain unchanged. Fig.15 As shown, in order to facilitate connection, a threaded connection cavity is provided at the left end of the screw rod 4, that is, the end facing the middle connection 2.
[0053] like Fig.21 As shown, the middle connection 2 is arranged at the end of the barrel 3 and connected to the machine mouth 1; further, the two ends of the middle connection 2 are respectively connected to the machine mouth 1 and the barrel 3, the inner cavity specifications of the side connected to the barrel 3 are adapted to the inner cavity specifications of the barrel 3, and are located to facilitate the injection of materials, and the inner cavity at the connection between the middle connection 2 and the barrel 3 is provided with a guide port, and a connecting cavity is provided on the side of the middle connection 2 facing the machine mouth 1.
[0054] like Fig. 22 As shown, the inner cavity of the nozzle 1 facing the middle connection 2 is connected to the inner cavity of the middle connection 2, and the nozzle 1 is connected to the connecting cavity of the middle connection 2 through threads; the nozzle 1 has a jet port on the side away from the middle connection 2 for ejecting materials.
[0055] like Figure 3-Figure 13As shown, a feed port 7 is provided on the connecting barrel 6 and the barrel 3. Due to the setting of the connecting rod 5, the length of the screw 4 is shorter than that of the prior art, and the feed port 7 needs to be moved forward. The utility model moves the feed port 7 to the front end of the connecting barrel 6, transports the raw material from the feed port to the front end of the barrel and melts it, and then pushes the screw forward to inject the molten plastic into the mold cavity through the nozzle, thereby reducing the plasticization time.
[0056] The plasticizing unit provided by the utility model configures an original whole screw structure into a segmented structure, including a screw and a connecting rod; through the segmented screw structure, the proportion of melt glue of large mold and small glue amount parts is increased and the material retention time is reduced.
[0057] Furthermore, Figure 3 As shown, the feed port 7 is located at the front end of the overlap between the connecting cylinder 6 and the barrel 3.
[0058] Considering the need to shorten the length of the screw 4 and thus reduce the plasticizing time, the starting end of the screw 4 is located at the head of the connecting tube 6, so the feed port 7 is opened here, which can not only shorten the length of the screw 4, but also utilize the connecting tube 6 for protection and guidance.
[0059] As an optional implementation of the present utility model, Figure 1 As shown, it also includes a hopper 8 installed at the feed inlet 7.
[0060] In order to facilitate feeding, the hopper 8 includes a funnel part and a cylindrical part. The cylindrical part is used to carry the material, and the funnel part is used to accelerate the moving speed of the material under the action of gravity.
[0061] like Figure 3 As shown, the inner cavity of the connecting cylinder 6 includes a first chamber 9 and a second chamber 10 arranged in a stepped form; the barrel 3 is disposed in the first chamber 9; and the connecting rod 5 is disposed in the second chamber 10.
[0062] Further, such as Figure 3 As shown, a limiting convex ring 11 is arranged in the first chamber 9; the rear end of the barrel 3 has a first step portion 12 and a second step portion 13; the diameter of the first step portion 12 is equal to the inner diameter of the limiting convex ring 11; the diameter of the second step portion 13 is equal to the diameter of the first chamber 9; the diameter of the barrel 3 is larger than the diameter of the first chamber 9; and it also includes a locking nut 14, a threaded section is arranged on the first step portion 12, the locking nut 14 is screwed on the first step portion 12, and abuts against the limiting convex ring 11.
[0063] In order to prevent the material from leaking out from one side of the connecting rod 5 , a sealing structure 15 is provided between the head end of the connecting rod 5 (the end facing the screw 4 ) and the inner wall of the second chamber 10 .
[0064] It should be noted that the sealing structure 15 may be a sealing ring or other sealing structures.
[0065] like Figure 3 and Fig.14 As shown, the screw 4 includes a connecting section 16 , a metering section 17 , a plasticizing section 18 and an injection section 19 which are arranged in sequence; the connecting section 16 is a bare rod structure and is located between the feed port 7 and the first chamber 9 .
[0066] In order to facilitate the connection, the connecting rod 5 and the screw rod 4 are connected via a slot or a thread.
[0067] The plasticizing unit of the utility model uses a scientific injection molding method to confirm the molding parameters (pressure, position, speed, etc.) after the transformation, so as to ensure good product production consistency and stable equipment operation.
[0068] like Figure 1 As shown, the utility model provides an injection molding machine, including the above-mentioned plasticizing unit.
[0069] As a further improvement of the utility model, it also includes an injection seat assembly 200 and an injection cylinder assembly 300 supported at the bottom of the plasticizing unit 100; it also includes a pre-plasticizing assembly 400 installed at the rear end of the plasticizing unit 100 for driving the plasticizing unit 100 to move.
[0070] It should be noted that the injection molding machine is mainly divided into the injection part, the mold clamping part, the safety protection door, the hydraulic transmission part, the lubrication part, the electrical control part, and the fuselage part. Figure 1 As shown, the injection part is used to melt and plasticize a specified amount of plastic uniformly to the molding temperature within a specified time, inject the molten material into the mold molding cavity at a certain pressure and speed, and maintain the pressure. The key structure is the plasticizing unit, which heats the barrel 3 and rotates the screw 4 to transport the raw material from the feed port 7 to the front end of the barrel 3 and melt it, and then pushes the screw 4 forward to allow the molten plastic to be injected into the mold molding cavity through the machine nozzle 1. The injection seat assembly 200 and the injection cylinder assembly 300 mainly play a supporting role, and the pre-plastic assembly 400 mainly serves as a power mechanism.
[0071] The screw in the injection molding machine of the utility model is different from the traditional integral structure, such as Figure 2 As shown, the conventional structure adopts screw integrated molding, the screw size is longer, the melt volume is larger, and it can meet the production of conventional parts on the same machine. However, for the small amount of glue parts produced on the same machine, there is a long heat retention time and the material is easy to carbonize and decompose. In the utility model, the screw adopts a segmented structure (such as Figure 3), which is divided into the front-end metering, plasticizing, and injection sections and the rear-end transmission connection section, which can effectively reduce the amount of melt glue in the equipment, reduce the plasticizing time and heat retention time of polymer materials, and reduce the risk of carbonization and decomposition of materials. Compared with the conventional screw integrated structure, the segmented structure mainly adds connecting rods and connecting cylinders (such as Figure 3 ) structure, in which the "screw" is composed of a screw 4 that plays a plasticizing role and a connecting rod 5. The movement of the screw 4 is driven by the connecting rod 5. The two are connected by a slot or thread to achieve axial and front-to-back movement synchronization. The outer connecting tube 6 plays a protective and guiding role, and moves the feed port 7 forward (such as Figure 3 Hopper position), matching the plasticizing section of the screw.
[0072] While keeping the clamping tonnage and mold size of the equipment unchanged, the total amount of melted glue in the equipment is reduced by modifying the plasticizing unit structure, so as to achieve stable production of large machine tools and small glue-volume products. The proportion of melted glue for large molds and small glue-volume parts is increased from 2%-4% to more than 20%, and production efficiency is improved by more than 5%, switching losses are reduced by more than 30%, and energy consumption is reduced by more than 10%.
[0073] It should be noted that in order to ensure the stability and consistency of the process before and after the transformation, the actual flow rate of the melt in the mold cavity is required to remain unchanged. Due to the adjustment of the plasticizing unit (screw length, diameter, etc.), the injection pressure, speed, position, etc. set by the equipment need to be adjusted, including:
[0074] ①Pressure setting: When the output pressure of the equipment remains unchanged, the theoretical pressure change before and after the transformation is n times Where: D 2 is the screw diameter before transformation, D' 2 is the screw diameter after transformation;
[0075] When the pressure required for product molding remains unchanged, the injection pressure, holding pressure and back pressure are 1 / n of the original production parameters. The equipment adjusts and solidifies the upper limits of each pressure, while improving the safety of the plasticizing unit.
[0076] ② In order to ensure the stability and consistency of the process before and after the transformation, the actual flow rate of the melt in the mold cavity is required to remain unchanged. The setting requirements for the positions of each section (including injection position, holding position, residual glue position, etc.) and speed (including injection speed, holding speed, etc.) after the transformation are as follows:
[0077] V m’ =nV m S m’ =nS m
[0078] Where: V m The m-stage firing rate before the transformation, V m′ After modification, the firing rate in the m segment is: S m is the position of the mth segment before the transformation, Sm′ The position of segment m after transformation;
[0079] The plasticizing unit structure of the new injection molding machine in the utility model can effectively solve the problems of poor stability and easy carbonization of materials in the production process of large molds and small glue parts. By adjusting the effective working size of the screw, the energy loss of heat radiation in the plasticizing section and the material switching loss between different materials can be reduced, and the effect of energy saving and consumption reduction can be achieved under the premise of improving product quality.
[0080] First of all, it should be explained here that “inward” refers to the direction toward the center of the accommodating space, and “outward” refers to the direction away from the center of the accommodating space.
[0081] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0082] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0083] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0084] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0086] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A plasticizing unit, characterized in that: It includes a machine nozzle, a middle connection, a machine barrel, a screw, a connecting rod, and a connecting barrel; among which: The connecting sleeve is sleeved on one end of the barrel; The connecting rod is arranged in the connecting cylinder; The screw is arranged in the barrel, and one end of the screw extends into the connecting barrel and is connected to the connecting rod; The middle connection is arranged at the end of the barrel and connected to the machine nozzle; The connecting cylinder and the barrel are provided with feed ports.
2. The plasticizing unit according to claim 1, characterized in that: The feed port is located at the front end of the overlapped portion between the connecting cylinder and the barrel.
3. The plasticizing unit according to claim 1, characterized in that: Also included is a hopper installed at the feed inlet.
4. The plasticizing unit according to claim 1, characterized in that: The inner cavity of the connecting cylinder includes a first chamber and a second chamber arranged in a stepped form; the barrel is arranged in the first chamber; and the connecting rod is arranged in the second chamber.
5. The plasticizing unit according to claim 4, characterized in that: A limiting convex ring is arranged in the first chamber; the tail end of the barrel has a first step portion and a second step portion; the diameter of the first step portion is equal to the inner diameter of the limiting convex ring; the diameter of the second step portion is equal to the diameter of the first chamber; the barrel diameter is larger than the first chamber diameter; and it also includes a locking nut, a threaded section is arranged on the first step portion, the locking nut is screwed on the first step portion, and abuts against the limiting convex ring.
6. The plasticizing unit according to claim 4, characterized in that: A sealing structure is provided between the head end of the connecting rod and the inner wall of the second chamber.
7. The plasticizing unit according to claim 4, characterized in that: The screw comprises a connecting section, a metering section, a plasticizing section and an injection section which are arranged in sequence; the connecting section is a bare rod structure and is located between the feed port and the first chamber.
8. The plasticizing unit according to claim 1, characterized in that: The connecting rod and the screw rod are connected via a slot or a thread.
9. An injection molding machine, characterized in that: Comprising a plasticizing unit as described in any one of claims 1-8.
10. The injection molding machine according to claim 9, characterized in that It also includes an injection seat assembly and an injection cylinder assembly supported at the bottom of the plasticizing unit; and a pre-plasticizing assembly installed at the rear end of the plasticizing unit for driving the plasticizing unit to move.