Main Production Equipment

This production line is used for blanking of steel coil and cutting to round steel plate, using computer optimization design, with high mechanical strength, operating smoothly. Control parts adopt digital circuit, main components and parts:PLC, touch screen, servo motor etc. selected with international famous brand. Feeding length is controlled by servo motor, with high accuracy. Blanking die can realize double or three blanking. The material of die is Cr12Mov, processed by vacuum hardening. The whole production line is with high automation, stable operation, low failure rate, convenient maintenance. it’s the first choice of LPG cylinder manufacturing machines.

Personalized solutions can be provided based on customer demands. Specific parameters and functions can be adjusted according to the actual equipment configuration to meet the process requirements of different customers.

Equipment Overview
The head stretching machine is one of the core equipment in the liquefied petroleum gas (LPG) cylinder production line. It is mainly used to form metal plates (usually high-quality carbon steel) into cylinder heads (hemispherical or ellipsoidal end caps) through cold stretching process. This equipment, in conjunction with a dedicated drawing die, ensures high dimensional accuracy and uniform wall thickness of the head, meeting the strict safety standards for pressure vessels.
Equipment composition and functions
1. Mainframe structure
It adopts a four-column or frame-type hydraulic press design, featuring high rigidity and strong resistance to eccentric loads.
The main oil cylinder drives the stretching slider to complete the bidirectional stretching action. The pressure is adjustable (usually 100-300 tons), suitable for the forming of heads of different specifications.
It is equipped with a hydraulic buffer system to prevent the sheet from cracking or wrinkling during the stretching process.
2. Stretching die
Material o: Die steel (such as H13) has undergone heat treatment and is hard chrome-plated on the surface, featuring excellent wear resistance.
o structure: It is divided into the convex die (upper die) and the concave die (lower die). The cavity is designed in accordance with GB/T 5842 or DOT standards to ensure that the curvature radius of the head and the edge transition meet the requirements.
Cooling system: The mold is equipped with built-in water channels, which control the forming temperature through the circulation of coolant and reduce material stress.
3. Automated auxiliary system
Automatic feeding device: Precisely position metal discs (billets).
Lubrication spray unit: Spray high-molecular lubricant on the blank before stretching to reduce the coefficient of friction.
o Waste stripping mechanism: Automatically separates the head from the scraps after molding.
Technical parameters
• Applicable materials: SPHC, Q345R and other steel plates with a thickness of 3 to 6mm.
• Forming accuracy: Diameter tolerance ±0.5mm, roundness ≤0.8mm.
• Production efficiency: Single cycle time ≤30 seconds (depending on specifications).
Safety and quality control
The equipment is equipped with photoelectric protection devices and emergency stop systems to prevent misoperation.
After stretching, the head needs to be inspected by an ultrasonic thickness gauge and appearance to ensure there are no cracks and the thinning rate meets the standards.
Application advantages
The one-piece forming process avoids welds and enhances the compressive strength of the gas cylinder.
The mold is modularly designed and can be quickly replaced to adapt to multi-specification production (such as 15kg and 50kg cylinders).

This machine is a horizontal levelling machine, also known as edge sweeping machine. The use of fetal positioning, pneumatic tightening, automatic tool mouth. It has reasonable mechanism, reliable performance, simple and convenient operation and high production efficiency.

The machine adopts fetal positioning, pneumatic clamping, and automatic feed of flat mouth turning tool (vertical) under the push of hydraulic cylinder, and the feed speed can be implemented stepless speed regulation, and the head automatically up and down. This machine integrates machine, electricity, gas and liquid in one. It has reasonable mechanism, reliable performance, simple and convenient operation and high production efficiency.

The machine adopts the positioning of the birth gear, the pneumatic clamping, and the automatic feed of the flat hob under the push of the hydraulic cylinder, and the feed speed can be stepless speed regulation, and the head can be automatically up and down. This machine integrates machine, electricity, gas and liquid in one. It has reasonable mechanism, reliable performance, simple and convenient operation and high production efficiency.

QK-9 CNC vertical tool leveling machine, using automatic refueling linear slider guide rail, high precision, fast speed, long life, easy and simple maintenance, feed using servo CNC, spindle with stepless speed regulation. Compared with the same industry machine production capacity is more efficient and energy-saving (has been issued by the state invention patent certificate).

This machine is of mechanical-electrical-gas integration, adopts dish end rotation, mold positioning and cylinder compressing, inner and external polishing wheel proceed rust cleaning for the dish ends welding parts by cylinder automatic feeding, compact structure, stable property, high working efficiency,(Manipulator can be installed to realize automatic input and exit of materials), one person can operate two sets machines, it’s the ideal machine for LPG cylinder manufacturing. This machine can realize automatic operation by linkage with conveyors.

This machine composed of hydraulic power unit, mainframe, mold and electronic control parts. It can satisfy the requirements of different sizes products, compact structure, stable property. It can punch single hole or double holes. It has advantages of high punching speed, high work efficiency, accurate positioning, safe and reliable etc…One person can operate two sets machines, it’s the ideal machine for LPG cylinder manufacturing.

This machine adopts roller positioning, pneumatic compressing, hydraulic step less speed regulating, automatic feeding. to make the dish ends extrusion forming, accommodate to the requirements of different materials. The biggest advantage of this machine is that it can processing different diameter dish ends only on one machine. One person can operate two sets machines,it is the ideal machine for LPG cylinder manufacturing.

This machine is suitable for welding LPG cylinder valve base and dish end, use Lincoln MAG pulsed power supply, frequency converting control revolving speed. One key operating, welding joint sophisticated transition, no splash on two sides. Convenient and simple operation, welding condition can be adjusted flexibly, can proceed different welding condition. One person can operate two sets machines, it is the ideal machine for LPG cylinder manufacturing.