Pressurizing and weight-reducing screw rod

Abstract

The utility model relates to a pressurizing and weight-reducing screw rod which comprises a pressurizing screw rod, a screw rod head group is connected to the front end of the pressurizing screw rod through threads, a non-return ring and a meson are arranged in the screw rod head group, the rear end of the pressurizing screw rod is connected with a feeding screw rod through threads, a material pipe is arranged on the outer circle of the pressurizing screw rod group, and a pressurizing cylinder is coaxially arranged in an inner hole in the front end of the material pipe. A flange is installed on the coaxial front end face of the material pipe, the pressure cylinder is coaxially located between the flange and the material pipe, the flange and the material pipe are locked through screws, and therefore the pressure cylinder is fixed, the flange is coaxially provided with a nozzle in threaded connection, the size of a coaxial middle hole in the front end of the material pipe is consistent with that of a flange feeding port, and the size of a flange discharging port is consistent with that of a nozzle feeding port. According to the pressurizing and weight-reducing screw, the whole screw can be replaced on the basis of not changing a material pipe and a driving device, so that the pressurizing and weight-reducing screw is suitable for injection molding of different doses, and the cost is greatly saved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to a pressure-increasing and weight-reducing screw. Background Art

[0002] Injection molding is an essential component of modern industry. Different products require varying injection volumes, which in turn necessitate different screw types. Furthermore, the associated screw components, such as the barrel, drive unit, flange, and nozzle, all require replacement, resulting in significant cost. Therefore, a need exists in the art for an injection molding screw that can accommodate various injection volumes while minimizing costs. Utility Model Content

[0003] The purpose of the present invention is to provide a pressure-increasing and weight-reducing screw in order to overcome the defects of the prior art.

[0004] In order to achieve the purpose of the present invention, the present application provides the following technical solutions.

[0005] In the first aspect, the present application provides a pressurizing and weight-reducing screw, which includes a material pipe, a flange fixed at the front end of the material pipe, a nozzle fixed at the front end of the flange, and a screw head group. The pressurizing and weight-reducing screw includes a feeding screw located at the rear end and a boosting screw group located at the front end. The boosting screw group includes a boosting cylinder and a boosting screw, wherein the boosting cylinder is installed inside the material pipe, and the outer diameter of the rear end of the boosting cylinder matches the inner diameter of the material pipe. The boosting screw is installed in the boosting cylinder, and the rear end of the boosting screw is fixedly installed at the top end of the feeding screw. The diameter of the boosting screw is smaller than the diameter of the feeding screw.

[0006] The utility model can replace the entire screw without changing the material pipe and the drive device, so it is suitable for injection molding of different doses. Only the booster and weight-reducing screw group and the booster cylinder need to be replaced, and the rest are the original old parts. This saves the configuration required for standard machine modification, including but not limited to the material pipe, flange, nozzle, heating ring, transmission shaft, half ring, discharge seat and water jacket, and saves about 60% of the standard machine modification cost, thereby saving energy and improving profit margin and market competitiveness.

[0007] In addition, by setting a booster screw, the injection weight of the entire screw can be reduced, the material injection pressure can be increased, and the residence time of the material in the material pipe can be reduced, reducing the carbonization decomposition phenomenon. It is suitable for large machines to produce small-metering products and large screws to be modified to produce small-precision products. After the screw is reduced, the cross-sectional area of ​​the screw is proportional to the volume, so the injection metering position becomes longer, which is more conducive to the precision injection multi-stage process control. The cross-sectional area of ​​the screw is inversely proportional to the injection pressure. The injection pressure becomes larger, which can solve the shrinkage problem of thick-walled and easy-to-shrink products, and can increase the product density to achieve better injection quality. It is suitable for the production of precision injection products.

[0008] In one embodiment of the first aspect, the ratio of the diameter of the boosting screw to the diameter of the feeding screw is (0.2-0.9):1.

[0009] In one embodiment of the first aspect, the booster cylinder is T-shaped and includes a vertically arranged mounting sleeve and a coaxially arranged horizontal injection sleeve. The outer diameter of the injection sleeve matches the inner diameter of the material pipe. The mounting sleeve is positioned at the front end of the injection sleeve and is clamped between the material pipe and the flange. No gap remains between the injection sleeve and the inner diameter of the material pipe, thereby ensuring that all material enters the injection sleeve and then enters the flange and nozzle.

[0010] In one embodiment of the first aspect, the tail end of the boosting screw is fixed to the front end of the feeding screw through a connecting thread, and the tail end of the screw head assembly is fixedly installed on the front end of the boosting screw through a connecting thread.

[0011] In one embodiment of the first aspect, the screw head group is fixedly installed at the front end of the booster screw, and the screw head group includes a screw head, a meson, and a check ring, wherein the tail end of the screw head is fixed to the front end of the booster screw through a connecting thread, the check ring is sleeved on the sealing section of the screw head, and the meson is fixed on the guide section of the screw head, which is similar to the screw head group in the prior art.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] (1) The entire screw can be replaced without changing the material tube and drive device, so it is suitable for injection molding of different doses and saves costs.

[0014] (2) It can reduce the weight of the entire screw, increase the material injection pressure, and at the same time reduce the residence time of the material in the material pipe, reduce carbonization, and is suitable for precision injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall assembly of the pressurizing and weight-reducing screw in Example 1;

[0016] Figure 2 It is a structural diagram of the material tube;

[0017] Figure 3 Schematic diagram of the structure of the feeding screw;

[0018] Figure 4 It is a structural diagram of the boost cylinder;

[0019] Figure 5 Schematic diagram of the structure of the booster screw;

[0020] Figure 6 It is a structural diagram of the flange;

[0021] Figure 7 is a schematic diagram of the screw head;

[0022] Figure 8 Schematic diagram of the anti-reverse ring;

[0023] Figure 9 is a schematic diagram of a meson;

[0024] Figure 10 Schematic diagram of the nozzle.

[0025] In the accompanying drawings, 1 is the material pipe, 2 is the feed port, 3 is the feeding screw, 4 is the booster screw, 5 is the booster cylinder, 6 is the screw head, 7 is the meson, 8 is the anti-reverse ring, 9 is the flange, 10 is the nozzle, 11 is the first cavity, 12 is the injection sleeve, 13 is the installation sleeve, 14 is the connecting thread, and 15 is the second cavity. DETAILED DESCRIPTION

[0026] Unless otherwise defined, technical or scientific terms used in this specification and claims shall have the ordinary meanings understood by persons having ordinary skill in the art to which this invention belongs. All numerical values ​​listed herein, from the lowest value to the highest value, refer to all numerical values ​​obtained by incrementing the lowest value to the highest value by one unit when the difference between the lowest value and the highest value is two units or more.

[0027] The following describes specific embodiments of the present invention. It should be noted that, in the context of describing these embodiments, for the sake of brevity and clarity, this specification does not exhaustively describe all features of the actual embodiments. Those skilled in the art may modify and replace the embodiments of the present invention without departing from the spirit and scope of the present invention, and the resulting embodiments are also within the scope of protection of the present invention.

[0028] Example

[0029] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.

[0030] Example 1

[0031] A pressure-increasing and weight-reducing screw, the structure of which is as follows Figure 1 As shown, it includes a material pipe 1, a screw head 6, a meson 7, a check ring 8, a flange 9, a nozzle 10, a screw and other components, wherein the screw includes a feed screw 3 at the rear end and a booster screw group at the front end. The details are as follows.

[0032] The structure of the material tube 1 is as follows Figure 2 As shown, it is no different from the existing material pipe, and a feed port 2 is provided on the rear end side wall thereof. A first cavity 11 is opened backward at the front end face of the material pipe 1.

[0033] The structure of the feeding screw 3 is as follows Figure 3 As shown, the feeding screw 3 is installed in the material pipe 1, and its main function is to extrude, melt and transport the material forward. Compared with the existing screws, the feeding screw 3 used in this application is relatively short.

[0034] The booster screw assembly includes a booster screw 4 and a booster cylinder 5. The structure of the booster cylinder 5 is as follows: Figure 4 As shown, it is T-shaped as a whole, including a mounting sleeve 13 arranged vertically at the front end and an injection sleeve 12 arranged horizontally at the rear end. When installed, the rear end face of the mounting sleeve 13 abuts against the front end face of the first cavity 11. The outer diameter of the injection sleeve 12 matches the inner diameter of the material tube 1. The booster screw 4 is installed in the injection sleeve 12, and its structure is as shown in FIG. Figure 5 As shown, the rear end of the boosting screw 4 is provided with a connecting thread 14, and is fixed to the top end of the feeding screw 3 by the connecting thread 14. The diameter of the boosting screw 4 is smaller than that of the feeding screw 3.

[0035] The structure of flange 9 is as follows Figure 6 As shown, a second cavity 15 recessed forward is provided at the rear end axis thereof, the rear end face of the second cavity 15 abuts against the front end face of the mounting sleeve 13, and the second cavity 15 and the first cavity 11 are docked with each other, and the flange 9 and the material pipe 1 are locked and connected by screws. Since the mounting sleeve 13 is located between the flange 9 and the material pipe 1, it will naturally be clamped and fixed by the flange 9 and the material pipe 1.

[0036] In this embodiment, the structures of the screw head 6, the check ring 8, the meson 7 and the nozzle 10 are as follows: Figures 7 to 10 As shown, it is the same as the prior art. Specifically, the tail end of the screw head 6 is fixedly mounted on the top of the booster screw 4. The meson 7 is fixed to the outside of the screw head 6, and the outer diameter of the meson 7 is smaller than the inner diameter of the injection sleeve 12. The check ring 8 is sleeved on the outside of the screw head 6, and the diameter of the check ring 8 matches the inner diameter of the injection sleeve 12. The nozzle 10 is fixedly mounted on the front end of the flange 9.

[0037] The working process of the pressurized and weight-reducing screw is as follows:

[0038] The material enters the feed pipe 1 through the feed port 2. It is melted and conveyed forward by the feed screw 3. Upon reaching the booster cylinder 5, it enters the interior of the booster cylinder 5 and is further conveyed forward by the booster screw 4. Because the inner diameter of the booster cylinder 5 is smaller than that of the feed pipe 1, and the diameter of the booster screw 4 is smaller than that of the feed screw 3, the pressure and flow rate of the material within the booster cylinder 5 are both increased. The material then passes through the screw head 6 and flange 9, ultimately exiting the nozzle 10, completing the injection molding process. This step is identical to the process of a conventional screw injection molding machine and will not be further described here.

[0039] The above description of the embodiments is intended to facilitate understanding and application of the present application by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without expending any creative effort. Therefore, the present application is not limited to the embodiments described herein, and improvements and modifications made by those skilled in the art based on the disclosure of this application without departing from the scope and spirit of this application are within the scope of this application.

Claims

1. A pressurized and weight-reducing screw, comprising a material pipe, a flange fixed to the front end of the material pipe, a nozzle fixed to the front end of the flange, and a screw head assembly, characterized in that: The boosting and weight-reducing screw includes a feeding screw at the rear end and a boosting screw group at the front end, and the boosting screw group includes a boosting cylinder and a boosting screw, wherein the boosting cylinder is installed inside the material pipe, and the outer diameter of the rear end of the boosting cylinder matches the inner diameter of the material pipe, the boosting screw is installed in the boosting cylinder, and the rear end of the boosting screw is fixedly installed on the top end of the feeding screw, and the diameter of the boosting screw is smaller than the diameter of the feeding screw.

2. The pressurized and weight-reducing screw according to claim 1, characterized in that: The ratio of the diameter of the boosting screw to the diameter of the feeding screw is (0.2-0.9):

1.

3. The pressurized and weight-reducing screw according to claim 1, characterized in that: The booster cylinder is T-shaped and includes a vertically arranged mounting sleeve and an injection sleeve coaxial with the mounting sleeve and horizontally arranged. The outer diameter of the injection sleeve matches the inner diameter of the material pipe. The mounting sleeve is arranged at the front end of the injection sleeve and is clamped between the material pipe and the flange.

4. The pressurized and weight-reducing screw according to claim 3, characterized in that: The tail end of the boosting screw is fixed to the front end of the feeding screw through a connecting thread, and the tail end of the screw head group is fixedly installed on the front end of the boosting screw through a connecting thread.

5. The pressurized and weight-reducing screw according to claim 1, characterized in that: The screw head assembly is fixedly mounted on the front end of the booster screw.

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