Poultry Plastic Weighing Shackle

1. Product Quick Reference

2. Product Introduction – Precision Weighing Starts with a Precision Shackle

The ZYRP-PSSK1003 poultry weighing shackle is a single-leg suspension hook engineered specifically for in-line dynamic weighing, automatic grading, and high-speed sorting operations in modern broiler processing plants. Unlike conventional multi-bird hooks designed for air-chilling or evisceration lines, this automatic grading shackle is purpose-built to interface with load cells, checkweighers, and optical sorting systems that require individual bird isolation for accurate weight determination. Each single-leg plastic shackle holds exactly one bird, eliminating the tare weight variability and positional interference common in double-shackle designs, delivering the clean, unambiguous measurement data that automated grading algorithms demand.

3. The Engineering Logic Behind PA6 + POM Dual-Material Design

The ZYRP-PSSK1003 PA6 POM sorting hook is not a single-material molding; it is a deliberate assembly of two complementary engineering thermoplastics, each selected for its specific contribution to shackle performance. The PA6 body provides the structural backbone — with a tensile strength exceeding 80 MPa and an impact resistance of over 10 kJ/m² (Charpy notched), it withstands the repetitive loading and unloading forces encountered at sorting stations operating at speeds of up to 8,000 birds per hour. Simultaneously, the POM pivot insert delivers a coefficient of friction of 0.12–0.15 against steel release pins, ensuring that birds are consistently released at the correct bin position without sticking or delayed drop. This poultry weighing shackle also benefits from POM's exceptional creep resistance, which maintains the pivot's dimensional accuracy even after 2 million release cycles, preventing the loosening that can cause release timing drift — a common failure mode in all-metal or single-material plastic shackles. The dual-material approach extends the service life of the automatic grading shackle by an estimated 40% compared to conventional acetal-only designs, directly reducing replacement frequency and long-term spare parts expenditure.

4. Lightweight Advantage – 50% Weight Reduction and Its Impact on Weighing Accuracy

The ZYRP-PSSK1003 plastic weighing shackle weighs approximately 50% less than a comparable stainless steel hook — a difference that has profound implications for dynamic weighing accuracy. In in-motion checkweighing systems, the tare weight of the shackle is subtracted from the gross measurement to determine the bird's net weight. Any inconsistency in tare weight across the shackle population introduces systematic measurement error. The injection-molded PA6+POM construction of this poultry weighing shackle delivers unit-to-unit weight consistency within ±0.5 grams, compared to ±3–5 grams for fabricated metal hooks with variable weld deposits and grinding variances. This tighter tare weight control improves the repeatability of the weighing system, enabling processors to classify birds into tighter weight bands — for example, reducing the spread of a 1.8 kg nominal grade from ±75 g to ±50 g. The single-leg plastic shackle's lower mass also reduces the dynamic load on the load cell during high-speed conveyance, minimizing vibration-induced noise in the measurement signal. As a cost-effective OEM replacement, this lightweight design delivers professional-grade weighing performance at a fraction of the cost of premium branded hooks, making precision grading accessible to mid-sized processors.

5. Automatic Unloading Reliability – The POM Pivot Advantage

The success of any automated grading line depends on the reliability of the bird release mechanism. The ZYRP-PSSK1003 automatic grading shackle incorporates a POM pivot bushing that rotates around a stainless steel release pin, creating a low-friction interface that requires minimal actuation force from the sorting station's mechanical or pneumatic release arms. In real-world operation, this translates to a release failure rate of less than 0.05% — significantly lower than the 0.3–0.5% typical of metal shackles where corrosion or wear increases sticking. The PA6 POM sorting hook's POM component also resists the swelling that can occur with moisture absorption in nylon-only designs, ensuring consistent pivot clearance even in the high-humidity environment of post-chiller grading areas. This reliability ensures that birds are routed to the correct weight-class bin on the first attempt, minimizing the manual rework required to handle mis-sorted carcasses. For processors aiming to reduce headcount in the sorting area, the dependable release performance of this poultry weighing shackle is a key enabler of true automation. As a CE certified poultry equipment component, the shackle's release mechanism has been tested to withstand over 3 million actuations at rated load without measurable pivot wear or deformation.

6. Hygienic and Corrosion-Free Performance in High-Washdown Environments

Grading stations typically experience frequent washdown cycles with hot water, alkaline detergents, and sanitizing chemicals. The ZYRP-PSSK1003 plastic weighing shackle is engineered to endure these aggressive cleaning protocols without performance degradation. Unlike metal hooks that develop pitting, surface rust, or crevice corrosion over time — which can harbor bacteria and affect release smoothness — the PA6 POM sorting hook is inherently corrosion-proof and chemically resistant to the peracetic acid, quaternary ammonium compounds, and chlorine-based sanitizers common in poultry sanitation programs. The non-porous injection-molded surface prevents biofilm adhesion and allows washdown fluids to drain completely, supporting short drying times and effective microbial control. The poultry weighing shackle also withstands temperature cycling from ambient (20°C) to hot washdown (80°C) without warping or dimensional change, as confirmed by thermal cycling tests over 1,000 cycles. This robust chemical and thermal resistance ensures that the automatic grading shackle maintains its weighing accuracy and release consistency over years of service, making it a dependable component in the most demanding production environments.

7. Universal Rail Compatibility and Tool-Free Installation

The ZYRP-PSSK1003 single-leg plastic shackle is dimensionally compatible with the standard overhead rail spacing used by all major poultry conveyor system manufacturers — including Meyn, Marel, Stork, Linco, and Baader. The top mounting lug matches the industry-standard 25.4 mm pitch interface, enabling direct attachment to existing trolley carriers without requiring line modifications, adapters, or special tools. Installation is a simple push-fit operation that takes seconds per shackle, allowing maintenance crews to perform rapid changeovers during shift breaks or scheduled downtime. This plug-and-play compatibility makes the cost-effective OEM replacement shackle ideal for both planned upgrades and emergency repairs, as it can be stocked as a universal spare part that fits all rail configurations. For new line installations, the poultry weighing shackle provides a standardized, readily available solution that simplifies procurement and reduces the variety of shackle SKUs required in inventory.

8. Multi-Species Suitability and Load Range

While optimized for broiler processing (1.0–3.5 kg bird weight), the ZYRP-PSSK1003 PA6 POM sorting hook is also suitable for weighing and sorting other poultry species, including small ducks, poussin, and Cornish game hens. The PA6 body provides a safety factor of 5× against the maximum rated load, with a demonstrated breaking strength exceeding 150 kg. This substantial over-engineering ensures that the plastic weighing shackle can withstand occasional overloads due to double-bird loading or mechanical mishandling without catastrophic failure — a critical safety consideration in high-speed automated lines. The poultry weighing shackle's open-frame design provides clear access to the bird's feet and legs, supporting manual quality checks integrated into the automated grading workflow.

9. Summary – Precision, Reliability, and Value in One Shackle

The ZYRP-PSSK1003 poultry weighing shackle delivers the precision, durability, and hygienic performance required for modern automatic grading operations, at a cost point that respects your bottom line. Its PA6+POM dual-material design ensures accurate weighing, reliable automatic unloading, and extended service life — all while weighing 50% less than metal alternatives and never rusting. Fully compatible with standard overhead rails and backed by CE, ROHS, and SGS certifications, this automatic grading shackle is a trusted, CE certified poultry equipment component that supports consistent product classification and reduced rework. As part of ZYRP's comprehensive spare parts portfolio — including air chilling hooks, portioning shackles, trolleys, wheels, and chain components — the cost-effective OEM replacement shackle offers a single-source solution for all your overhead conveyor needs. Whether upgrading an existing sorting line or equipping a new facility, the ZYRP-PSSK1003 provides the accuracy and reliability to maximize grading efficiency and product value.

10. Contact Information

Hebei Zunyan Technology Co., Ltd.

Email: [email protected]

Website: www.poultrytrolley.com

Precision Weighing Starts Here — PA6+POM Engineering for Accurate Grading.