Weight increasing screw

Abstract

The utility model relates to a weight increasing screw, which comprises a material pipe group, a screw group, a screw head group arranged at the front end of the screw group, a flange arranged at the front end of the material pipe group and a nozzle arranged at the front end of the flange, and the material pipe group comprises a feeding material pipe at the rear end and an injection cylinder detachably arranged at the front end of the feeding material pipe. The screw set comprises a feeding screw at the rear end and a metering screw detachably installed at the front end of the feeding screw, the outer diameter of the feeding screw is matched with the inner diameter of the feeding pipe, the outer diameter of the metering screw is matched with the inner diameter of the injection cylinder, and the outer diameter of the metering screw is larger than the outer diameter of the feeding screw. The whole screw rod can be replaced on the basis of not changing a material pipe and a driving device, so that the injection molding machine is suitable for injection molding of different doses, and the cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to a weight-adding screw. Background Technology

[0002] Injection molding is a crucial component of modern industry, with different products requiring varying injection volumes. Currently, different injection volumes necessitate the selection of different screw sizes, and each screw size requires a fixed set of components, including the feed tube, drive unit, flange, and nozzle. Therefore, molding different products may necessitate multiple injection molding machines, leading to high costs. Consequently, there is a need in this field for equipment that can increase injection volume while minimizing costs. Utility Model Content

[0003] The purpose of this invention is to overcome the defects of the existing technology and provide a weight-adding screw.

[0004] To achieve the purpose of this utility model, this application provides the following technical solution.

[0005] In a first aspect, this application provides a weight-enhancing screw, the weight-enhancing screw comprising a feed tube assembly, a screw assembly, a screw head assembly disposed at the front end of the screw assembly, a flange disposed at the front end of the feed tube assembly, and an injection nozzle disposed at the front end of the flange. The feed tube assembly includes a rear-end feed tube and an injection cylinder detachably mounted at the front end of the feed tube. The screw assembly includes a rear-end feed screw and a metering screw detachably mounted at the front end of the feed screw. The outer diameter of the feed screw matches the inner diameter of the feed tube, the outer diameter of the metering screw matches the inner diameter of the injection cylinder, and the outer diameter of the metering screw is larger than the outer diameter of the feed screw.

[0006] Because the injection cylinder of this application is detachably installed at the front end of the feed tube, and the metering screw is detachably installed at the front end of the feed screw, when a larger injection volume is required, only the original injection cylinder and metering screw need to be replaced with injection cylinders and metering screws of larger diameter, and then the corresponding screw head assembly, flange, and nozzle are adjusted. However, the original feed tube, feed screw, drive device, and other components do not need to be replaced. These are the most expensive components in the entire equipment. Therefore, this approach can greatly reduce costs and improve profit margins and market competitiveness.

[0007] In one embodiment of the first aspect, the ratio of the outer diameter of the metering screw to the outer diameter of the feeding screw is 1 to 5:1. Preferably, it is 1.1 to 2.5:1.

[0008] In one embodiment of the first aspect, a transition connecting block is provided between the feeding tube and the injection cylinder. The transition connecting block is T-shaped and extends through the front and rear. A front guide for the feeding tube is provided at the center of the front end, and an inward rear guide for the injection cylinder is provided at the center of the rear end. The rear end of the transition connecting block is inserted into the front guide of the feeding tube, and the channel at the rear end of the transition connecting block abuts against the channel of the feeding tube. The front end of the transition connecting block is inserted into the rear guide of the injection cylinder, and the channel at the front end of the transition connecting block abuts against the channel of the injection cylinder.

[0009] In one embodiment of the first aspect, the tail end of the metering screw and the front end of the feeding screw are fixedly connected by connecting threads. The connecting threads can be located at the tail end of the metering screw or at the front end of the feeding screw.

[0010] In one embodiment of the first aspect, the screw head assembly includes a screw head, a separator, and a check ring. The tail end of the screw head is provided with connecting threads, and the screw head is fixed to the front end of the metering screw via the connecting threads. The separator is fixedly installed on the outer wall of the middle portion of the screw head, and the check ring is sleeved on the outer side of the screw head. The structure of the screw head assembly is similar to that of the prior art, with the check ring sleeved on the sealing section of the screw head and the separator fixed on the guide section of the screw head.

[0011] In one embodiment of the first aspect, the flange is mounted on the front end of the injection cylinder.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] The entire screw can be replaced without changing the feed tube and drive unit, thus making it suitable for injection molding with different dosages and saving costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the weight-adding screw in Example 1.

[0015] Figure 2 This is a schematic diagram of the weight-adding screw before injection.

[0016] Figure 3 This is a schematic diagram of the feeding pipe.

[0017] Figure 4 This is a schematic diagram of the feeding screw.

[0018] Figure 5 This is a schematic diagram of the injection cylinder.

[0019] Figure 6 This is a schematic diagram of the transition connection block.

[0020] Figure 7 This is a schematic diagram of the metering screw.

[0021] Figure 8 This is a schematic diagram of the screw head assembly.

[0022] Figure 9 This is a schematic diagram of the flange structure.

[0023] Figure 10 This is a schematic diagram of the nozzle structure.

[0024] Figure 11 This is a schematic diagram of the feeding screw in Example 2.

[0025] Figure 12 This is a schematic diagram of the metering screw in Example 2.

[0026] In the attached diagram, 1 is the feed pipe, 2 is the feed screw, 3 is the transition connecting block, 4 is the injection cylinder, 5 is the metering screw, 6 is the screw head assembly, 7 is the flange, 8 is the nozzle, 9 is the feed inlet, 10 is the front guide of the feed pipe, 11 is the rear guide of the injection cylinder, 12 is the connecting thread, 13 is the screw head, 14 is the check ring, 15 is the separator, and 16 is the connecting thread. Detailed Implementation

[0027] Unless otherwise defined, the technical or scientific terms used in this specification and claims shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. All values ​​listed herein, ranging from the minimum to the maximum, refer to all values ​​obtained by incrementing the minimum and maximum values ​​by one unit when the difference between the minimum and maximum values ​​is more than two units.

[0028] The following describes specific embodiments of this utility model. It should be noted that, in order to provide a concise description, this specification cannot provide a detailed description of all features of the actual embodiments. Without departing from the spirit and scope of this utility model, those skilled in the art can modify and substitute the embodiments of this utility model, and the resulting embodiments are also within the protection scope of this utility model.

[0029] Example

[0030] The embodiments of this utility model will be described in detail below. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0031] Example 1

[0032] A weight-adding screw, the structure of which is as follows: Figure 1 , Figure 2 As shown, the components include a feeding pipe 1, a feeding screw 2, a transition connecting block 3, an injection cylinder 4, a metering screw 5, a screw head assembly 6, a flange, and an injection nozzle 8, as detailed below:

[0033] The structure of the feeding pipe 1 is as follows Figure 3 As shown, it is no different from the existing feed pipe. The feed pipe 1 has an inlet 9 on the rear side wall and a feed pipe front guide 10 is opened at the front end face of the feed pipe 1.

[0034] The structure of the feeding screw 2 is as follows Figure 4 As shown, the feeding screw 2 is installed inside the feeding tube 1. Its main function is to extrude and melt the material and convey it forward. Compared with existing screws, the feeding screw 2 used in this application is relatively short. A drive device (not shown in the figure) is connected to the rear end of the feeding screw 2. The main function of the drive device is to push the feeding screw 2 forward or backward along the feeding tube 1.

[0035] The structure of injection cylinder 4 is as follows Figure 5 As shown, the rear end of the injection cylinder 4 is fixedly connected to the front end of the feeding pipe 1 via a flange structure. A rear guide 11 is provided forward at the rear end face of the injection cylinder 4. A T-shaped transition connecting block 3 is provided at the connection between the injection cylinder 4 and the feeding pipe 1, and its structure is as follows: Figure 6 As shown, the tail end of the transition connecting block 3 is inserted into the front guide 10 of the feeding pipe 1, and the front end of the transition connecting block 3 is inserted into the rear guide 11 of the injection cylinder 4. The transition connecting block 3 is connected from front to back, and the tail end of its channel abuts against the front end of the channel of the feeding pipe 1; the front end of its channel abuts against the tail end of the channel of the injection cylinder 4.

[0036] The structure of the metering screw 5 is as follows: Figure 7 As shown, the tail end of the metering screw 5 is provided with connecting threads 12, and is fixedly installed at the front end of the feeding screw 2 through the connecting threads 12. The outer diameter of the metering screw 5 matches the inner diameter of the injection cylinder 4, and the outer diameter of the metering screw 5 is larger than the outer diameter of the feeding screw 2.

[0037] The structures of the screw head assembly 6, flange 7, and nozzle 8 are as follows: Figure 8 , Figure 9 , Figure 10As shown, they are identical to existing technologies. Specifically, the screw head assembly 6 includes a screw head 13, a separator 15, and a check ring 14. The tail end of the screw head 13 is fixedly mounted on the top of the metering screw 5 via connecting threads 16. The separator 15 is fixed to the outside of the screw head 13, and the outer diameter of the separator 15 is smaller than the inner diameter of the injection cylinder 4. The check ring 14 is sleeved on the outside of the screw head 13, and the diameter of the check ring 14 matches the inner diameter of the injection cylinder 4. The flange 7 is fixedly mounted on the front end of the injection cylinder 4, and the nozzle 8 is fixedly mounted on the front end of the flange 7.

[0038] The biggest advantage of this weight-adding screw is that:

[0039] Since the injection volume is related to the inner diameter of the injection cylinder 4 and the outer diameter of the metering screw 5, the larger the inner diameter of the injection cylinder 4 and the larger the outer diameter of the metering screw 5, the larger the injection volume. Generally, the metering screw 5 and the feeding screw 2 have the same diameter, the inner diameter of the injection cylinder 4 and the inner diameter of the feeding tube 1 are also the same, and the transition connecting block 3 has a consistent channel diameter. When a larger injection volume is required, the connection between the injection cylinder 4 and the feeding tube 1 is loosened, then the connection between the metering screw 5 and the feeding screw 2 is loosened, and the transition connecting block 3 is removed. Then, a transition connecting block 3 with a larger opening at the front and a smaller opening at the back is selected, and a metering screw 5 and an injection cylinder 4 with a larger diameter are used. After the replacement, a larger injection volume can be achieved. Therefore, this equipment can achieve a larger injection volume, and during the switching process, the feeding tube 1, the feeding screw 2, and the drive device do not need to be replaced, which greatly reduces equipment costs.

[0040] Example 2

[0041] The structure is similar to that of Embodiment 1, with the only difference being that in this embodiment, the connecting thread 12 is located at the front end of the feeding screw 2, while the tail end of the metering screw 5 has an internal thread that matches the connecting thread 12, specifically as follows: Figure 11 , Figure 12 As shown.

[0042] The above description of the embodiments is intended to enable those skilled in the art to understand and apply this application. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, this application is not limited to the embodiments described herein, and any 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 weight-enhancing screw, the weight-enhancing screw comprising a feed tube assembly, a screw assembly, a screw head assembly disposed at the front end of the screw assembly, a flange disposed at the front end of the feed tube assembly, and a nozzle disposed at the front end of the flange, characterized in that, The feed tube assembly includes a rear feed tube and an injection cylinder detachably installed at the front end of the feed tube. The screw assembly includes a rear feed screw and a metering screw detachably installed at the front end of the feed screw. The outer diameter of the feed screw matches the inner diameter of the feed tube, and the outer diameter of the metering screw matches the inner diameter of the injection cylinder. The outer diameter of the metering screw is larger than the outer diameter of the feed screw.

2. The weight-adding screw as described in claim 1, characterized in that, The ratio of the outer diameter of the metering screw to the outer diameter of the feeding screw is 1 to 5:

1.

3. The weight-adding screw as described in claim 1, characterized in that, A transition connecting block is provided between the feeding tube and the injection cylinder. The transition connecting block is T-shaped and extends through the front and rear. The front end of the feeding tube has a front guide, and the rear end of the injection cylinder has an inward rear guide. The rear end of the transition connecting block is inserted into the front guide of the feeding tube, and the channel of the rear end of the transition connecting block abuts against the channel of the feeding tube. The front end of the transition connecting block is inserted into the rear guide of the injection cylinder, and the channel of the front end of the transition connecting block abuts against the channel of the injection cylinder.

4. The weight-adding screw as described in claim 1, characterized in that, The tail end of the metering screw and the front end of the feeding screw are fixedly connected by connecting threads.

5. The weight-adding screw as described in claim 1, characterized in that, The screw head assembly includes a screw head, a separator, and a check ring. The tail end of the screw head is provided with connecting threads, and the screw head is fixed to the front end of the metering screw through the connecting threads. The separator is fixedly installed on the outer wall of the middle part of the screw head, and the check ring is sleeved on the outside of the screw head.

6. The weight-adding screw as described in claim 1, characterized in that, Among them The flange is installed at the front end of the injection cylinder.

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