Find HS Code and trade information for balance piece

Balance Piece

A balance piece, also known as a balancing weight, counterweight, or simply a balance, is a component used to achieve static or dynamic equilibrium in a mechanical system. These pieces are strategically added to rotating or reciprocating parts to counteract imbalances and reduce vibration, noise, and stress.

Material

Balance pieces are commonly manufactured from dense materials to maximize their effect with minimal size. Common materials include:

• Steel: The most prevalent material due to its high density, affordability, and machinability. Various steel alloys are used depending on the application’s requirements for corrosion resistance and temperature stability.
• Cast Iron: Used in larger, heavier applications where cost is a significant factor.
• Lead: Historically used, but its application is decreasing due to environmental concerns regarding toxicity. Still found in some older systems.
• Brass: Used in applications requiring corrosion resistance.
• Polymers with embedded metal: Used in lighter-duty applications or where non-metallic properties are desired.

Purpose

The primary purpose of a balance piece is to:

• Reduce Vibration: Imbalances cause vibrations that can lead to premature wear, noise, and reduced efficiency.
• Minimize Noise: Vibration directly translates to audible noise.
• Decrease Stress: Imbalances create cyclical stresses on components, shortening their lifespan.
• Improve Efficiency: Reducing vibration and stress allows for smoother operation and increased energy efficiency.
• Enhance Stability: Particularly important in rotating machinery, balancing ensures stable operation at higher speeds.

Function

Balance pieces function by offsetting the centrifugal force created by rotating or reciprocating masses.

• Static Balancing: Involves adding weight to counteract a single imbalance in a rotating component. This ensures the center of gravity lies on the axis of rotation.
• Dynamic Balancing: More complex, addressing both static and couple imbalances. This involves adding weights at specific locations and angles to eliminate vibrations at all speeds.

Usage Scenarios

Balance pieces are used in a wide range of applications:

• Rotating Machinery:
  • Engines: Counterbalancing crankshafts, connecting rods, and pistons.
  • Turbines: Balancing rotating blades and impellers.
  • Fans and Blowers: Ensuring smooth operation and minimizing noise.
  • Pumps: Counterbalancing impellers and rotors.
  • Electric Motors: Balancing rotors for efficient and quiet operation.
• Reciprocating Machinery:
  • Compressors: Counterbalancing pistons and connecting rods.
  • Punch Presses: Reducing vibration and improving accuracy.
• Industrial Equipment:
  • Centrifuges: Balancing rotors for high-speed operation.
  • Conveyor Systems: Reducing vibration in rollers and pulleys.

Common Types

• Drilled Weights: Steel weights with pre-drilled holes for mounting. These are versatile and commonly used.
• Pin Weights: Small, cylindrical weights that are inserted into pre-drilled holes.
• Set Screws: Weights with a threaded screw for precise adjustment.
• Weld-on Weights: Used for permanent attachment to components.
• Clip-on Weights: Weights attached with clips or fasteners, allowing for easy removal and adjustment.
• Split Weights: Weights that can be opened and closed around a shaft for precise positioning.
• Custom Weights: Designed and manufactured to specific requirements for unique applications.

Balances of a sensitivity of 5 cg or better, with or without weights; parts and accessories thereof: Electrical balances and parts and accessories thereof * HS Code: 9016002000 * Chapter 90: Optical, precision, measuring, checking, testing, navigating and control instruments and apparatus; photographic or cinematographic, optical, precision, measuring, checking, testing, navigating and control instruments and apparatus; photographic or cinematographic apparatus and instruments. * Heading 16: Balances of a sensitivity of 5 cg or better, with or without weights; parts and accessories thereof. * Subheading 002000: Electrical balances and parts and accessories thereof.

Balances of a sensitivity of 5 cg or better, with or without weights; parts and accessories thereof: Other: Other * HS Code: 9016006000 * Chapter 90: Optical, precision, measuring, checking, testing, navigating and control instruments and apparatus; photographic or cinematographic, optical, precision, measuring, checking, testing, navigating and control instruments and apparatus; photographic or cinematographic apparatus and instruments. * Heading 16: Balances of a sensitivity of 5 cg or better, with or without weights; parts and accessories thereof. * Subheading 006000: Other: Other.

According to the provided reference material, the HS code options related to 'balance piece' are limited, with only the following 2 found.