CAD mechanical hydraulic designer Ended

Scope of Work (SOW): Hydraulic System Design for 8-Axis Automated Tractor Attachment
1. Project Overview
The objective of this project is to design a high-performance, 8-axis automated hydraulic system for a 2.5-ton class agricultural attachment. The system will be powered directly by a 50HP tractor’s hydraulic resource (without an independent reservoir) and controlled via a PLC and proportional joysticks.

2. Technical Specifications of Actuators (8 Sections)
The design must accommodate the following specific components:

Section 1 (Arm Swing): Swing Bearing (Slew Ring) driven by Hydraulic motor for turning bearing drive for 1-ton excavator(Include brake and shockless relief valves)

Section 2 (Gripper Rotation): 150° Rotary Actuator.

Section 3 (Gripper Open/Close): Tandem Cylinder (Synchronized control).

Section 4 (Arm Pitch): 30° Tandem Cylinder (High-load support).

Section 5 (Main Lift): Large-bore Double-acting Cylinder (For heavy lifting).

Section 6 (Outrigger/Blade): High-pressure Double-acting Cylinder (For stabilization).

Section 7 (Support Base): 30° Telescopic Cylinder (1-ton load capacity).

Section 8 (Cutter Movement): Telescopic Cylinder for linear positioning.

3. Core Engineering Requirements
Efficiency: Implement a Load Sensing (LS) system with Pressure Compensators for each section to ensure multi-functional synchronization.

Pressure Management: Design a Multi-stage Relief Valve circuit to adjust system pressure dynamically (50 bar to 200 bar) based on PLC signals.

Safety & Stability:

Direct-mounted Counterbalance Valves and Check Valves on all cylinder ports.

Main Relief Valve and Unloading Valve for pump and tractor transmission protection.

Performance: Integration of a Regeneration Circuit to increase cycle speed and reduce pump load during arm lowering/retraction.

Contamination Control: Parallel 10-micron High-performance Line Filters with clogging indicators at the pressure inlet.

4. Operational Logic & Sequence (Groups P, O, S, A–H)
The system must be optimized for sequential automation controlled by a PLC.

Peak Power Demand: Approximately 25 L/min at 200 bar (~12kW hydraulic power).

Sequence Highlights:

Group E (Extraction): Peak pressure (180–200 bar), 25 L/min flow.

Group G (Destination): Medium pressure (100 bar) for precise gripper release.

Standby/Idle: The Unloading Valve must be activated during idle states to bypass flow to the tractor's return port.

5. Physical Standards & Connectivity
Main Line (P/T): 3/4" (19mm) ID hoses with PT (BSPT) fittings.

Cylinder Lines (A/B): 1/2" (13mm) ID hoses.

Valve Bank: 8-section Load Sensing Proportional Valve (Rated for 60 L/min minimum).

Electrical: 24V DC Solenoid Valves with DIN or Deutsch connectors.

6. Deliverables
Hydraulic Schematic Diagram: Utilizing standard ISO symbols with all set pressures and flow rates marked.

Bill of Materials (BOM): Comprehensive list including manufacturers, part numbers, and technical specifications.

Hose & Fitting Schedule: Detailed list of hose lengths, diameters, and fitting types.

Control Interface Diagram: Wiring schematic for the PLC-to-Solenoid interface (including relays/FET modules).

[Special Instructions for the Contractor]
Back Pressure Management: Since this system utilizes the tractor's internal reservoir, the return line must be designed to minimize back pressure to prevent seal failure.

Heat Dissipation: As there is no external tank, the circuit design must prioritize thermal efficiency to prevent overheating of the tractor's hydraulic oil.

Modular Design: The valve bank and safety blocks should be arranged for easy maintenance and access within the 2.5-ton frame. read less