1.Appearance Refurbishment
Only the outer shell is painted, while core wear parts (screw and barrel) remain unprocessed, resulting in a significant decline in performance.
2.Hidden Wear and Aging of Key Components
High-value components such as the gearbox, main motor, and bearings suffer from excessive wear, vibration, or insulation aging, which are difficult to detect during test runs.
3.Falsified Performance Parameters or Obsolete Specifications
It is claimed to have high speed and high output, but the motor torque, screw design, or control system may be mismatched, resulting in failure to operate stably in practice.
4.Unknown SourceThe equipment may originate from bankrupt enterprises (with high-intensity usage), long-term idleness (resulting in corrosion), or rental turnover (with poor maintenance), leading to questionable history.
5.Vague or Falsified Nameplate Information
Information such as the equipment model, production date, and factory serial number has been tampered with or obscured, making it impossible to trace the true "identity" and service life.
6.Low-Price Temptation, Follow-Up High Costs
It attracts customers with extremely low prices, but the key components of the equipment are made of inferior materials (such as ordinary steel screws), which wear out extremely quickly, and the replacement cost far exceeds the price difference.
7.Unfulfilled After-Sales Service and Spare Parts Support
The seller provides no warranty or only an extremely short-term warranty. Additionally, the equipment model is outdated and has been discontinued by the original manufacturer, resulting in inability to source spare parts or obtain technical support for subsequent maintenance.
8.Contract Loopholes and Verbal Commitments
The contract stipulates vaguely on the equipment status, quality standards, and liability for breach of contract; the seller's verbal commitments have no legal effect.
9.Blindly Pursuing "High Configuration" or Brand Names
Purchasing large-specification, full-function equipment beyond actual needs leads to a sharp increase in procurement costs, energy consumption, and maintenance difficulty, resulting in a low return on investment.
10.Neglecting Energy Efficiency and Long-Term Operating Costs
Only focusing on the purchase price while failing to evaluate whether the equipment is energy-efficient (e.g., equipped with a high-efficiency motor and frequency converter) leads to excessively high long-term electricity costs.