Yizhan Group Compact Excavators in Medicinal Crop Harvesting
Specialized Solutions for Root Crops (Chinese Yam/Salvia miltiorrhiza/Polygonatum)

I. Competitive Advantages of Yizhan Compact Excavators

1. Precision Excavation & Damage Control

• Challenge: Traditional methods show 15-20% root damage rate for Chinese yam (Dioscorea opposita), Salvia miltiorrhiza, and Polygonatum

• Solution:

• Hydraulic-controlled bucket with ±5mm depth accuracy

• 0-90° bucket angle adjustment via electro-hydraulic system

• Shock-absorbing edge protection (patented design)

2. Terrain Adaptability

• Technical Specs:

• Min. working radius: 1.8m

• Slope capacity: 25° (47% grade)

• Ground pressure: 23kPa (track version) / 45kPa (wheel version)

• Field Performance:

• Zero-radius steering for confined plots (<5m²)

• Mud-grade tracks (500mm width) for paddy fields

3. Operational Efficiency

• Comparative Data:

  Parameter	Manual Labor	Yizhan Excavator
  Output (mu*/8hr)	0.15-0.2mu	2.5-3mu
  Fuel Consumption	N/A	3.5-4L/hr
  *1 mu ≈ 666.7m²

4. Soil Conservation Technology

• Layered Excavation Protocol:

1. Surface layer: 0-30cm (tilt bucket 45°)

2. Root zone: 30-150cm (vertical excavation)

3. Subsoil protection: Auto-depth limiter

5. Modular Attachments

• Quick-change System (ISO 7548 compliant):

• Narrow-tine bucket (300mm width) for yam

• Flat-edge bucket for Salvia miltiorrhiza

• Vibro-loosen attachment (20-30Hz adjustable)

II. Chinese Yam Harvesting Protocol

Phase 1: Pre-Harvest Preparation

• Soil Conditioning:

• Optimal moisture: 18-22% vol (tested via TDR probe)

• Schedule: 48-72hr post-irrigation window

• Field Setup:

• Implement grid mapping (RTK-GNSS guided)

• Debris clearance: Brush cutter attachment

Phase 2: Harvesting Operations

• Depth Control:

• Initial cut: 30cm @ 80° entry angle

• Progressive deepening: 10cm increments

• Speed Management:

• Travel speed: 0.3-0.5m/s (ECU-controlled)

• Engine RPM: 1500-1800 (ECO mode recommended)

Phase 3: Post-Harvest Handling

• Vibration Application:

• Frequency: 25Hz (±5% stability)

• Amplitude: 3-5mm (root protection mode)

• Human-Machine Interface:

• Remote monitoring: JDLink™ compatible

• Collision avoidance: 360° ultrasonic sensors

III. Cost-Benefit Analysis (Chinese Yam Case)