The HARSLE JH21 Pneumatic Power Press is a heavy-duty, high-precision C-frame machine. It is widely used for sheet metal stamping, punching, blanking, and bending. Engineered for durability and high productivity, it relies on compressed air and a central control system for fast, reliable, and smooth industrial operation.
Key Design and Structural Features
- Rigid Frame: The machine body is constructed from high-quality steel plates that are welded and subjected to tempering treatments and shot blasting, resulting in exceptional rigidity and minimized deformation under high stress.
- Crankshaft & Guideways: The vertically located crankshaft undergoes grinding treatment after high-frequency quenching for smooth rotation. It utilizes an elongated hexagonal guide system (or octagonal for heavy tonnage models) faced with bronze plating to deliver outstanding guiding precision.
- Pneumatic Balance Cylinders: Dual pneumatic cylinders balance the sliding block and punch weight, which reduces operational impact and noise, while simultaneously minimizing the clearance between the connecting rod and sliding block to reduce mechanical wear.
- Clutch & Brake System: Equipped with an imported high-sensitive combined wet pneumatic friction clutch and brake. This ensures accurate ram positioning, low maintenance, and long service life.
Operational Efficiency and Safety
- Hydraulic Overload Protection: The system is built with an imported hydraulic overload safety mechanism. If the working pressure exceeds the limit, the press instantly triggers an emergency stop and safely releases pressure, automatically resetting once the blockage is cleared.
- Automated Controls: The machine uses a central PLC system alongside a user-friendly HMI touch screen. Gas circuits use imported safety dual-valves, giving the operator the flexibility to switch between jog, inch, single, and continuous punching modes.
- Adjustable Die Height: Standard across most models is an motorized die shut height adjustment system (available on 60T and higher capacities) that includes a digital readout for precision, reducing downtime during mold swaps.
- Lubrication & Die Cushion Options: An automated, forced electric grease lubrication system continuously feeds key stress points, and the machine is fully compatible with additional accessories like tonnage monitors, light curtains, and automatic feeder shafts.
