Wuxi Huatong Pneumatic Manufacture
Pneumatics/Solenoid Valve/Cylinder
(1) Normal Conditions: Medium and ambient temperature: –20 to +80°C; Working pressure: 0.1–1.0 MPa. Refer to specific product datasheets for exceptions.(2) Pre-Installation Test: Pressure test at 1.5× working pressure; no air leakage allowed.(3) Lubrication: Install an oil mist lubricator at the air inlet. Proper lubrication is critical—poor lubrication causes crawling or complete failure.(4) Mounting: Align actuation direction correctly. Piston rod must never bear eccentric or lateral loads.(5) Variable Loads: If load changes during stroke, select a cylinder with ample force margin and add external cushioning.(6) Stroke Limit: Avoid full stroke—especially on extension—to prevent piston-to-end-cap impact and component damage.
As the actuator in a pneumatic system, cylinder quality directly impacts equipment performance. Consider the following when selecting:1. Choose manufacturers with strong reputation, proven quality, and reliable service.2. Verify the production standard—compare enterprise standards against industry norms if applicable.3. Inspect appearance, leakage, and no-load performance:A. Appearance: Barrel and rod must be scratch-free; end caps free of porosity or sand holes.B. Leakage: No external leakage except at rod seal. Internal and rod-end external leakage must each be < (3 + 0.15D) mL/min (D = bore in mm).C. No-Load Test: Run cylinder unloaded at low speed; the lower the minimum speed without crawling, the better.
The 10SR/DA pneumatic actuator uses a dual-rack-and-pinion mechanism with an aluminum alloy body. SR = spring-return (single-acting); DA = double-acting. Bore: Φ45–Φ400 mm. Standard models offer ±4° adjustability at 0° and 90° positions. Max theoretical torque @ 0.8 MPa: DA = 15,800 N·m; SR (K6 spring) = 9,696 N·m @ 0°, 7,488 N·m @ 90°.Main Features:1) Dual-rack design increasingly adopted to boost torque or reduce size (vs. traditional single-rack).2) Materials: Body—aluminum with hard-anodized finish (stainless for corrosive media, electropolished). Pinion shaft—stainless steel. Racks—stainless or die-cast aluminum, with composite bearings and wear rings to reduce friction and extend life. Seals—NBR O-rings (standard), FKM for high-temp, low-temp NBR for cold. Integrated anti-leak, bearing-guided shaft design ensures longevity.3) Oil-free lubrication—low friction, high reliability.4) Magnetic switch compatible for automated control.5) Mounting complies with internati...
Cylinder barrel bore requires high machining precision. Surface roughness depends on piston seal type: • O-ring seals: Grade 3 accuracy, Ra ≤ 0.4 μm • Y-ring seals: Grade 4–5 accuracy, Ra ≤ 0.4 μmCylindricity and roundness errors must not exceed half the dimensional tolerance. Perpendicularity between end face and bore must be within 2/3 of tolerance.If barrel surface finish is inadequate, friction between seal and bore increases, causing:• Elevated starting pressure• Crawling (jerky motion)• Accelerated seal wear → internal leakage → failure to meet performance specs.Prevention: Improve machining accuracy of barrel and rod surfaces.
Main features of compact cylinders: (1) Buffering: Small bore and short stroke → low impact → typically use elastomeric buffer pads. (2) Piston Sealing: Uses either custom-profile or C-shaped bidirectional seals with oil reservoirs—supports oiled or oil-free lubrication for low friction and high reliability. (3) Magnetic Sensing: Pistons available with or without embedded magnetic rings. Barrel features a T-slot for magnetic switches, enabling non-contact position feedback. (4) Assembly: Barrel-to-end-cap connection typically uses C-clips; some models use crimped joints. (5) Variants: From base model, derivatives include: double-rod, adjustable extension/retraction stroke, dual/multi-stroke, tandem (force-boosting), guided-rod, anti-rotation, high-temp, and single-acting types. Bore: typically 12–100 mm (min 4 mm, max 125 mm); Stroke: 5–80 mm (max 150 mm). Aluminum barrel and end caps. Belongs to China’s second-generation cylinder products. Compact cylinders are 1/2–1/3 the axia...
How to choose cylinder bore? Determine the required load, then calculate the appropriate bore diameter.Selection Parameters:1. Compressed air supply pressure2. Direction of force (thrust or pull)Calculation Formulas:Thrust Force Fo = 0.25πD²PPull Force Fo = 0.25π(D² - d²)PVariables:D = Piston diameter (cm)d = Piston rod diameter (cm)P = Working pressure (kgf/cm²)Fo = Theoretical output force (kgf)Notes:1. Valid for cylinder speeds of 50–500 mm/s.2. For vertical upward mounting, usable thrust ≈ 50% of theoretical value.3. For horizontal mounting, actual force ≈ theoretical force (accounting for inertia).
Historically known as “heavy-duty cylinders” in China, these feature bores from 32–320 mm and strokes up to 3000 mm. Barrels are made from seamless steel tubes; end caps from steel plate or cast iron. Large-diameter piston rods are chrome-plated and polished, used in metallurgy and heavy machinery.During China’s pneumatic industry founding era (1967–1980), national focus on heavy industry drove demand. In 1975, a nationwide collaborative design effort produced the first-generation QGA (non-cushioned), QGB (adjustable cushion), and JB (fixed cushion, for metallurgy) series—bore 32–400 mm.First-Gen Design: Single-rod, double-acting. Barrels: seamless steel. Rods: 45# steel. End caps/pistons: HT250 gray iron. Tie rods: cold-drawn 35# steel. Seals: Yx-type hydraulic leather rings (no dedicated pneumatic seals existed), resulting in high starting pressure (0.2–0.35 MPa). No wear rings; front cap supported rod via bronze bushing.Despite age, these remain in service in harsh environme...
Compact cylinder bore sizes typically range from Φ12 to Φ100 mm (min Φ4, max Φ125 mm), with strokes of 5–80 mm (max 150 mm). The barrel and end caps are made of aluminum alloy. These belong to China’s second-generation cylinder products, with the QGD series as the primary representative—available in single-acting and double-acting versions.Buffering: Due to small bore and short stroke, impact forces are low; most use elastomeric buffer pads.Piston Sealing: Features either custom-profile or C-shaped bidirectional seals with oil reservoirs—supporting both oiled and oil-free lubrication for low friction and high reliability.Magnetic Option: Pistons come with or without embedded magnetic rings. The barrel includes a T-slot for magnetic switches, enabling automated position sensing.Assembly: Barrel-to-end-cap connection typically uses spring steel C-clips, though some models use crimped joints.Based on the standard design, variants include: double-rod, adjustable extension/retractio...
I. Cylinder Operating Requirements1) Standard operating conditions: ambient and medium temperature 5–60°C, working pressure 0.4–0.6 MPa (gauge). Outside this range, use special seals and extremely dry air.2) Pressure test at 1.5× working pressure before installation; zero leakage permitted.3) If load varies significantly over the stroke, select a cylinder with sufficient force margin.4) Avoid full stroke operation—especially on extension—to prevent impact damage.5) Ensure proper lubrication. Except for oil-free cylinders, correctly install and adjust an oil mist lubricator; poor lubrication severely degrades performance or causes failure.6) Pay attention to piston rod strength. Rod threads are vulnerable to impact damage. Since rods typically handle compressive loads, consider buckling stability for long rods and sagging due to self-weight in horizontal mounting. Never subject the rod to radial loads.7) At the rod end connection, high-inertia loads cause impact upon stopping, ris...
