Ensuring the quality of electric forklifts requires full lifecycle management from design, manufacturing, testing to use. The following is a systematic quality control plan:

1、 Quality control during the design phase

CAE simulation analysis

Structural strength simulation (safety factor ≥ 1.5)

Thermal management simulation (motor temperature rise ≤ 45 ℃)

Dynamics simulation (maximum acceleration ≤ 3m/s ²)

reliability design

Critical components MTBF ≥ 10000 hours

Fault Tree Analysis (covering 95% of potential fault modes)

Reduced rating design (electronic component utilization rate ≤ 80%)

2、 Quality standards for key components

Battery System

Compliant with GB/T 31486-2022 standard

Cycle life ≥ 2000 times (80% DOD)

Thermal runaway suppression (temperature rise ≤ 200 ℃ within 5 minutes)

driving system 

Motor protection level IP54

Controller overload capacity 150% rated current for 30 seconds

Braking energy recovery efficiency ≥ 65%

hydraulic system

Cleanliness level NAS level 7

The temperature resistance range of the seal is -30 ℃~120 ℃

Pump valve system response time ≤ 0.2 seconds

3、 Manufacturing process control

process specification

Welding robot automation rate ≥ 80%

Coating line film thickness detection (dry film thickness 80 ± 20 μ m)

Assembly torque control (± 5% allowable deviation)

Quality Inspection

Three coordinate measuring instrument with an accuracy of 0.01mm

Full size inspection of laser tracker

Online X-ray inspection (weld seam detection)

system certification

ISO 9001 Quality Management System

IATF 16949 Automotive Industry Certification

CE/EAC Market Access Certification

4、 Testing and Verification System

Type test

400 hour intensive road test (including full load climbing, emergency braking, etc.)

Salt spray test (96 hour neutral salt spray test)

Vibration test (three-axis random vibration, power spectral density 0.5g ²/Hz)

Delivery inspection

Insulation resistance test (≥ 1M Ω)

Load test (125% rated load static pressure test)

Waterproof test (IPX4 rating)

Third party testing

Certification by the National Forklift Quality Inspection Center

T Ü V Rheinland Functional Safety Certification

UL 2272 Electrical Equipment Safety Certification

5、 Supply Chain Management

Supplier Evaluation

Key component supplier audit (QSA/QPA score ≥ 85 points)

Battery suppliers need to pass UN38.3 testing

Motor supplier ISO/TS 16949 certification

material control

The qualification rate of incoming inspection batches is ≥ 99%

Key Material Traceability System (QR Code Full Lifecycle Traceability)

Storage environment monitoring (temperature and humidity recording)

6、 Usage and maintenance standards

Daily inspection

Battery electrolyte level (checked weekly)

Brake system travel (adjusted monthly)

Tire wear (measured every 500 hours)

regular maintenance

Replace hydraulic oil every 2000 hours

Calibrate the load sensor every 4000 hours

Overhaul the drive system every 8000 hours

Fault handling

Establish FMEA database (including 500+typical fault cases)

Remote diagnostic system (real-time monitoring of 28 parameters)

Spare parts supply cycle (core components ≤ 48 hours)

7、 Quality improvement mechanism

8D reporting system (complete root cause analysis within 8 working days after discovering quality issues)

APQP preliminary planning (new product development requires completion of 5 stages of access control review)

PPAP production approval (critical characteristic process capability index Cpk ≥ 1.33)

By implementing the above quality control system, it can be ensured that electric forklifts:

Mean Time Between Failures (MTBF) increased by 40%

Reduce maintenance costs by 35%

Extended service life to 12000 hours

Customer satisfaction rate of over 95%

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment