Metso A413331

Technical & Performance Parameters

• Screw Base Material Hardness: HRC 62–65 overall quenching and tempering hardness
• Transmission Efficiency: 92% maximum mechanical transmission efficiency
• Allowable Axial Dynamic Load: 125 kN continuous load, 180 kN instantaneous impact load
• Positioning Repeat Accuracy: ±0.01 mm full stroke positioning error
• Lead Pitch Standard: 10 mm single lead thread
• Total Effective Stroke: Customized matched stroke according to host equipment (standard 300 mm)
• Operating Temperature Range: -30 °C ~ +80 °C
• Lubrication Cycle Interval: 2000 hours grease replenishment cycle
• Standard Assembly Dimensions: Screw outer diameter 40 mm, nut outer diameter 78 mm, overall assembly length 420 mm
• Net Assembly Weight: 3.7 kg
• Service Life Design Standard: 20,000 hours continuous heavy-load operation without replacement

Material Composition

1. Screw shaft: Medium carbon chromium molybdenum alloy steel, overall vacuum quenching hardening treatment
2. Circulating steel ball: GCr15 bearing steel, ultra-fine grinding precision ball, surface hardness HRC 64
3. Nut body: Cast alloy steel, internal thread raceway high-frequency quenching
4. Pre-pressure adjustment shim: Stainless steel elastic thin shim group
5. Dust-proof sealing ring: High-temperature resistant nitrile rubber composite felt double-layer dust-proof structure
6. Circulation reversing device: Die-cast aluminum alloy wear-resistant circulation guide

Structural Characteristics

1. Internal circulation single-lead ball screw structure, built-in reversing guide block for steel ball closed circulation
2. Double nut pre-pressure elimination clearance design, zero backlash under full stroke operation
3. Double-layer front and rear dust-proof sealing ring on nut both ends, block ore dust, mud and water vapor from entering internal raceway
4. External centralized grease injection nozzle, convenient regular lubrication maintenance without disassembly
5. Standard flange mounting base on nut outer wall, direct bolt fixed to actuator sliding block
6. Screw shaft end reserved keyway and threaded interface, quick connection with servo motor coupling

Working Principle

1. Servo motor outputs rotary torque, transmits rotation to screw shaft through coupling
2. Screw shaft rotary motion pushes internal circulating steel ball to roll along spiral raceway
3. Steel ball rolling friction drives nut body to generate linear reciprocating displacement along screw axis
4. Double nut pre-pressure shim eliminates thread clearance, ensure high-precision linear positioning without backlash
5. Double-layer dust-proof ring intercept external mineral dust to prevent abrasive wear of steel ball and raceway
6. Centralized grease injection nozzle supplies lubricating grease to steel ball circulation channel, reduce rolling friction coefficient
7. Linear displacement of nut body drives actuator execution mechanism to adjust equipment running stroke and clearance

Core Function Features

1. Ultra-high mechanical transmission efficiency 92%, reduce servo motor load and equipment energy consumption
2. Zero backlash double nut pre-pressure structure, guarantee micron-level linear positioning accuracy
3. Heavy load impact resistance alloy steel material, adapt to mining equipment instantaneous impact load working condition
4. Built-in double-layer dust-proof sealing system, suitable for high dust mineral processing production environment
5. Centralized external lubrication interface, simplify daily maintenance operation steps
6. Wide temperature range adaptability, stable performance under low temperature open-air mine and high-temperature crushing workshop
7. Standard OEM installation size, fully interchangeable with original Metso host equipment

Advantage Highlights

1. Overall quenching alloy steel screw shaft, long wear service life under high dust abrasive working condition
2. GCr15 precision steel ball circulation rolling, friction resistance far lower than trapezoidal thread transmission
3. Instantaneous impact load resistance up to 180 kN, no deformation or thread collapse during crusher overload adjustment
4. ±0.01 mm ultra-high repeat positioning accuracy, realize automatic precise closed-loop control of crushing gap
5. Double-layer composite dust-proof structure, effectively avoid mineral particle abrasive damage to internal transmission pair
6. Standard OEM size, direct replacement without modifying host equipment structure

Applicable Industries

Installation Requirements

1. Ensure screw shaft and actuator sliding block maintain absolute horizontal or vertical coaxiality during installation, coaxial error ≤0.02 mm/m
2. Tighten flange fixing bolts of nut body according to specified torque value, avoid nut loosening under vibration
3. Install matched protective cover outside assembly to prevent large ore blocks from direct impact on screw shaft
4. Fill high-temperature resistant lithium-based lubricating grease through grease nozzle before formal operation
5. Motor coupling coaxiality calibration must be completed before equipment trial run, offset causes screw shaft eccentric wear
6. Limit travel buffer block must be installed at both ends of effective stroke to avoid nut collision damage

Usage Precautions

1. Strictly prohibit over-travel operation beyond effective stroke, will cause nut internal circulation reversing device fracture
2. Replenish specified lubricating grease every 2000 operating hours, dry friction leads to rapid raceway wear
3. Regularly clean dust-proof sealing ring surface mineral dust every 1 month, dust accumulation enters internal circulation channel to accelerate abrasion
4. Do not disassemble double nut pre-pressure shim group without professional calibration, disassembly causes positioning accuracy loss
5. Avoid welding operation near assembly, high temperature welding destroys screw surface quenching hardness layer
6. If abnormal noise occurs during operation, stop equipment immediately for inspection of steel ball loss and grease shortage