Modular building block screw

Abstract

Modular building block type screw mainly solves the problem of insufficient connection strength and reliability of current screw adopting multi-section type thread connection scheme. The modular building block type screw is provided, torque is transmitted through spline (first spline and second spline) cooperation, the bearing capacity and torsional strength are much higher than those of traditional thread connection, the spline cooperation has natural centering function, and the high coaxiality between the connecting rod bodies can be ensured; users can freely combine functional modules with different pitches and different mixing elements like building blocks according to the characteristics of materials and product requirements, quickly form special screw suitable for current process, and realize unprecedented production flexibility.

Description

Technical Field

[0001] This utility model relates to the field of screws, specifically to modular building block screws. Background Technology

[0002] Currently, there are multi-segment screws on the market that are connected by threads. This type of screw divides the overall screw into several segments, which are connected to each other by male and female threads at the ends. Compared to integral screws, this design allows users to adapt to different process requirements by combining screw segments with different functions (such as conveying, mixing, and shearing sections).

[0003] However, this traditional multi-segment threaded connection solution has a series of insurmountable technical defects in practical applications: Insufficient connection strength and reliability: Simple threaded connections are prone to loosening or fatigue fracture when subjected to enormous axial thrust and rotational torque. Even minor loosening at the connection point can cause abnormal noise and vibration, and can also lead to material retention and degradation in the connection gap, forming black carbon deposits that severely affect product quality. Furthermore, the structural weakness created by the connection point is a bottleneck in the screw's lifespan; once damaged, it often leads to the scrapping of the entire screw.

[0004] Poor centering and difficulty in ensuring dynamic balance: Multi-segment screws are connected by threads, and the coaxiality between the segments depends entirely on the machining accuracy of the threads. After long-term use, wear or micro-deformation will exacerbate the misalignment, causing the screw to generate huge centrifugal force when rotating at high speed, resulting in machine vibration and noise. This not only affects the life of the equipment but also limits the increase in screw speed.

[0005] Therefore, although the existing multi-segment threaded connection screw is intended to solve the problem of flexible production, its inherent structural defects make it difficult to meet the high-end requirements of modern efficient, precise and flexible extrusion in terms of connection reliability, dynamic stability, ease of maintenance and functional refinement.

[0006] Especially with the development of high-performance materials, more stringent requirements have been placed on screws. Taking dynamically vulcanized thermoplastic elastomers as an example, their processing involves both the melting and plasticizing of the thermoplastic resin and the dynamic vulcanization of the rubber phase. The materials have extremely high viscosity and strong shear sensitivity, placing extremely high demands on the screw's mixing, shearing, and self-cleaning capabilities. A fixed screw structure cannot simultaneously optimize the contradiction between "strong dispersion mixing" and "high transport efficiency" in TPV production. Traditional integral or multi-segment threaded screws, when dealing with such materials, either result in insufficient mixing leading to substandard product performance, or cause material degradation due to localized shear overheating, and suffer from extremely severe wear and high maintenance costs.

[0007] The industry urgently needs a new modular screw connection technology that can fundamentally overcome the above-mentioned defects and has high customizability, wear resistance and easy maintenance to meet the processing challenges of complex materials such as TPV. Utility Model Content

[0008] To overcome the shortcomings of the prior art, this utility model provides a modular building block screw, which mainly solves the problem of insufficient connection strength and reliability of the current screw using a multi-segment threaded connection scheme.

[0009] The technical solution of this utility model is as follows: A modular, building-block type screw includes a rod body, wherein a threaded edge is provided on the circumferential outer wall of the rod body, the rod body includes a first rod body and a second rod body, and the threaded edge includes a first threaded edge and a second threaded edge; The first rod body has an axially provided receiving groove, and the circumferential inner wall of the receiving groove has a first spline extending axially and an annular groove arranged radially; The second rod body has a boss on its axial outer wall, and the outer wall of the boss has a second spline and a groove that mate with the first spline. A retaining ring, part of which is disposed in the groove and part of which is disposed in the annular groove; The first screw is disposed on the first rod body, and the second screw thread is disposed on the second rod body.

[0010] It also includes a seal disposed on the boss, which is configured to simultaneously seal the annular gap between the outer wall of the boss and the inner bore of the first rod when the second spline engages with the first spline.

[0011] The sidewall of the annular groove near the port is constructed as a guide slope. When a pulling force is applied to separate the second rod from the first rod, the end of the snap ring contacts the guide slope and undergoes radial inward elastic deformation under its action, thereby disengaging from the annular groove and realizing the quick unlocking of the rod.

[0012] The pitches of the first and second screw edges are different.

[0013] The sealing element is a rubber sealing ring.

[0014] The sealing element is provided in multiple forms.

[0015] The beneficial effects of this utility model are as follows: This utility model provides a modular building block type screw, which transmits torque through spline (first spline and second spline) connection. Its load-bearing capacity and torsional strength are far higher than those of traditional threaded connections. The spline connection has a natural centering function, which can ensure that there is a very high coaxiality between each connecting rod. Users can freely combine functional modules with different pitches and different mixing elements according to the characteristics of materials and product requirements, just like building blocks, to quickly form a special screw that is most suitable for the current process, realizing unprecedented production flexibility. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.

[0017] Figure 2 This is a partial cross-sectional view of one embodiment of the present invention. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings. A modular, building-block type screw includes a rod body 1, with a threaded edge 2 on its circumferential outer wall. The rod body comprises a first rod body 11 and a second rod body 12, and the threaded edge includes a first threaded edge 21 and a second threaded edge 22. The first rod body has an axially oriented receiving groove 111, and the circumferential inner wall of the receiving groove has an axially extending first spline and a radially arranged annular groove 112. The second rod body has an axially oriented outer wall with a boss 121, the outer wall of which has a second spline 122 that mates with the first spline and a groove 113, and a retaining spring 115, part of which is located in the groove and part in the annular groove. A first screw is mounted on the first rod body, and the second threaded edge is mounted on the second rod body. Users can freely combine functional modules with different pitches and mixing elements, like building blocks, according to the characteristics of the material and product requirements, to quickly construct a dedicated screw best suited for the current process, achieving unprecedented production flexibility. The elasticity of the snap ring causes it to be partially located in the annular groove and partially in the recessed groove.

[0019] This modular, building-block screw system is designed for efficient and customizable processing of dynamically vulcanized thermoplastic elastomers (TPVs). Users can select and combine specialized modules from the module library based on the ratio of rubber to plastic phases in the TPV formulation and the characteristics of the vulcanization system. For example, a deep-groove, large-pitch conveying module ensures smooth material entry; a strong-mixing module with integrated dense pins and barrier sections achieves fine dispersion of the rubber phase and the intense shearing necessary for dynamic vulcanization; and a shallow-groove, small-pitch metering module establishes stable die head pressure. This targeted, modular design allows the screw system to perfectly adapt to the complex processing window of TPVs, something no traditional stationary screw system can achieve.

[0020] In this embodiment, as shown in the figure, a seal 114 is also included on the boss. This seal is configured to simultaneously seal the annular gap between the outer wall of the boss and the inner bore of the first rod when the second spline engages with the first spline. The specially designed seal (such as an O-ring) is compressed during spline engagement, effectively blocking potential leakage paths.

[0021] In this embodiment, as shown in the figure, the sidewall of the annular groove near the port is constructed as a guide ramp 15. When a pulling force is applied to separate the second rod from the first rod, the end of the snap ring contacts the guide ramp and undergoes radial inward elastic deformation under its action, thereby disengaging from the annular groove and achieving quick unlocking of the rod. The design of snap ring locking and guide ramp cooperation allows the connection and separation of the rods to be completed within minutes without any special tools. This enables precise maintenance by "replacing only where maintenance is needed," greatly reducing downtime.

[0022] In this embodiment, as shown in the figure, the first and second screw threads have different pitches. This allows users to customize the overall plasticizing and conveying capacity of the screw by combining rod modules with different conveying characteristics.

[0023] In this embodiment, as shown in the figure, the sealing element is a rubber sealing ring.

[0024] In this embodiment, as shown in the figure, multiple seals are provided. This multi-stage sealing approach further enhances the reliability of the seal.

[0025] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. The embodiments should not be considered as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A modular, building-block type screw, comprising a rod body (1), wherein a threaded edge (2) is provided on the circumferential outer wall of the rod body, characterized in that: The rod body includes a first rod body (11) and a second rod body (12), and the screw edge includes a first screw edge (21) and a second screw edge (22); The first rod body has an axially provided receiving groove (111), and the circumferential inner wall of the receiving groove is provided with a first spline extending along the axial direction and an annular groove (112) arranged in the radial direction. The second rod body has a boss (121) on its axial outer wall, and the outer wall of the boss has a second spline (122) and a groove (113) that mate with the first spline. A retaining ring (115), part of which is disposed in the groove and part of which is disposed in the annular groove; The first screw is disposed on the first rod body, and the second screw thread is disposed on the second rod body.

2. The modular building block screw according to claim 1, characterized in that: It also includes a seal (114) disposed on the boss, which is configured to simultaneously seal the annular gap between the outer wall of the boss and the inner hole of the first rod body when the second spline engages with the first spline.

3. The modular building block screw according to claim 2, characterized in that: The sidewall of the annular groove near the port is configured as a guide slope (15). When a pulling force is applied to separate the second rod from the first rod, the end of the snap ring contacts the guide slope and generates radially inward elastic deformation under its action, thereby disengaging from the annular groove to achieve quick unlocking of the rod.

4. The modular building block screw according to claim 3, characterized in that: The pitches of the first and second screw edges are different.

5. The modular building block screw according to claim 4, characterized in that: The sealing element is a rubber sealing ring.

6. The modular building block screw according to claim 5, characterized in that: The sealing element is provided in multiple forms.

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