Injection Head Wound Grooves Eliminate Centering Pins
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Solution Overview
Problem
Existing injection heads for producing plastics pipes with smooth and corrugated layers are complex, costly, and suffer from striation issues due to centering pins, requiring time-consuming tool exchanges and having multiple parts that complicate production and adjustment.
Innovation Solution
The injection head features axially oriented channels in the main head and nozzle body, with wound plastics distributor grooves in the mouthpiece for uniform output and adjustable nozzle gaps, reducing parts and eliminating the need for centering pins, allowing for efficient tool exchange and production of pipes with varying diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple individual parts (sleeve elements, spacer rings, centering pins) are used in the injection head, then precise centering and flow control can be achieved, but the device complexity and production costs increase
Solution Approach 1:
The patent combines multiple separate components (sleeve elements, spacer rings, centering pins) into an integrated mouthpiece structure. The mouthpiece consists of a central body with a surrounding sleeve body that forms the output annular slot, eliminating the need for separate centering mechanisms and reducing the total number of parts while maintaining precise centering through the integrated design.
Solution Approach 2:
The sleeve body surrounding the central body of the mouthpiece serves multiple functions simultaneously: it forms the output annular slot for material discharge, provides precise centering without requiring separate centering pins, and enables easy adjustment of the nozzle gap. This multi-functional design reduces device complexity while maintaining manufacturing precision.
2Manufacturing precision
If centering pins are used between the central body and sleeve body of the mouthpiece, then precise centering is achieved, but striation in the melted plastics material occurs
Solution Approach 1:
The patent removes centering pins from the mouthpiece design, eliminating the source of striation in the melted plastics material. Instead of using separate centering pins, the invention achieves precise centering through the integrated sleeve body and central body structure, which does not interfere with the smooth flow of material and prevents striation defects.
3Adaptability or versatility
If the injection head is designed with multiple individual parts for different pipe diameters, then versatility is improved, but the exchanging time for different diameters increases
Solution Approach 1:
The patent designs the mouthpiece with an adjustable sleeve body that can be positioned at different distances from the central body, allowing the nozzle gap to be adjusted for different pipe diameters. This dynamic adjustability eliminates the need to exchange entire tooling sets for different diameters, reducing tool changing time while maintaining versatility.
Solution Approach 2:
The injection head is designed with pre-configured adjustment mechanisms that allow quick changeover between different pipe diameters without requiring complete tool replacement. The adjustable sleeve body can be rapidly repositioned to the required gap setting, enabling fast adaptation to different production requirements.
4Ease of manufacture
If a compact main head and nozzle body design is used, then production costs are reduced, but the uniformity of melted plastics material output may be affected
Solution Approach 1:
The patent incorporates wound plastics distributor grooves on the lateral surface of the central body that are specifically designed to ensure uniform distribution of melted plastics material. This localized feature with optimized geometry maintains uniform output quality while the overall compact design reduces manufacturing costs by eliminating unnecessary components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design results in lower production costs, reduced striation, and faster tool exchanges, ensuring uniform output and easy adjustment of nozzle gaps without centering pins, enhancing the efficiency of producing plastics pipes with varying diameters.
Implementation Method 1
the central body of the at least one mouthpiece has a lateral surface which faces the respective sleeve body and has wound plastics distributor grooves which are distributed uniformly in the circumferential direction and each of which is flow-connected by means of a connecting portion to an annular groove
Data Source
AI summary
An injection head (10) is described for a corrugator which is intended for the production of plastics pipes. The injection head (10) has a main head (12), a nozzle body (14) and a mouthpiece means (16) with at least one mouthpiece (32, 36). The main head (12) is embodied with first channels (50, 52) and the nozzle body (14) is embodied with second channels (58, 60) which are flow-connected to the first channels (50, 52). The/each mouthpiece (32, 36) has a central body (74, 76) and a sleeve body, (78, 80) surrounding said central body. On its lateral surface (82, 84) facing the sleeve body (78, 80), the central body (74, 76) is embodied with wound plastics distributor grooves (86, 88) which are flow-connected by means of connecting portions (114, 120) to a concentric annular groove (112, 116) which is formed on the reverse surface (90, 92) of the central body (74, 76) and into which the second channels (58, 60) of the nozzle body (14) discharge.