Names and functions of major components of the four roll plate rolling machine
1、 Four core work rolls (forming execution components)
1. Upper roller (active roller)
The vast majority of hydraulic four roller upper rollers are active rollers with fixed positions (large models can be adjusted for lifting)
-Driven by the main motor and reducer in both forward and reverse directions, the steel plate is fed forward and backward by frictional force;
-The upper support point of the board bending bears the main bending load;
-Cooperate with the side rollers and lower rollers to achieve pre bending and rolling of the board;
-When rolling the cone tube, it can be adjusted to tilt slightly with one end.
2. Lower roller (center clamping roller, driven roller)
Located directly below the upper roller, it can be vertically lifted and lowered by hydraulic pressure
-After rising, clamp the steel plate with the upper roller to prevent the steel plate from slipping or moving during the rolling process;
-The lower support point of the formed sheet metal bears the reverse force of the sheet metal;
-When loading, descend to leave space for feeding, and release the discharge after processing is completed.
3. Left roller, right roller (edge roller, driven roller, four roller iconic components)
Two side rollers are arranged on the left and right sides of the lower roller, and can be independently raised and lowered along the diagonal direction of the frame (adjustable separately)
✅ Unique advantage of four rollers: achieving direct pre bending at both ends of the board without the need for flipping
-The lifting height determines the bending radius of the cylinder: the higher the side roller, the smaller the diameter of the roll out;
-Lift the steel plate separately on one side, pre bend the head and tail of the steel plate, and eliminate the remaining straight edges;
-The rollers on both sides do not rise and fall synchronously, and can be rolled into a conical cylinder;
-Forming a bending fulcrum for the sheet metal to achieve continuous plastic rolling.
>Work logic description: The upper roller fixes the fulcrum, the lower roller clamps the plate, and the height of the fulcrum on both sides of the rollers is adjusted. The bending forming is completed according to the three-point circle principle.
2、 Transmission system
1. Main drive motor+main reducer
Provide rotational torque for the upper roller, control the feeding speed of the sheet, and achieve forward and reverse rolling of the sheet.
2. Gear pairs and couplings
Connect the reducer to the upper roller, transmit power, and buffer impact loads.
3、 Host bearing structure
1. Left and right racks (wall panels)
The main load-bearing frame of the machine is welded, annealed, and precision machined from steel plates;
Internally equipped with guide rails to accommodate upper/lower/side roller bearing seats, capable of withstanding all rolling pressure.
2. Base (whole machine base)
Welded box structure, supporting the frame, hydraulic station, and all oil cylinders, ensuring the rigidity of the entire machine and preventing deformation caused by vibration during operation.
3. Bearing seat, rolling mill bearing
Supporting four rollers to withstand enormous radial forces; Self aligning roller bearings can adapt to slight tilting of the roller, which is beneficial for cone rolling.
4、 Hydraulic actuation system
1. Hydraulic station (oil pump, motor, valve group, oil tank, cooler)
The power source of the whole machine outputs high-pressure oil and controls the action of all oil cylinders; CNC models are equipped with proportional valves to accurately control roller displacement.
2. Lower roller lifting cylinder
Drive the lower roller to vertically lift and provide clamping force for the sheet metal.
3. Side roller push-pull/lifting oil cylinder
Drive the left and right rollers to ascend and descend along the inclined guide rail, independently and accurately positioning.
4. Overturning oil cylinder (unloading oil cylinder)
Drive the flipping side rack to flip open; After the cylinder is rolled, flip over the frame and release it, and directly take out the finished cylinder from the roller end.
5、 Electronic Control and Numerical Control System
1. Control cabinet and operation console
Manual operation of start stop, forward and reverse rotation, and roller lifting;
CNC model: PLC+CNC system, capable of inputting target diameter, automatically calculating side roller position, automatic multi pass rolling, and saving process parameters.
2. Displacement sensor (grating/magnetic grating)
Real time detection of the position of the lower roller and the left and right rollers, with CNC closed-loop control to ensure consistency in the roundness of the cylinder.
6、 Optional auxiliary device
1. Material rack/feeding support platform: Long steel plate feeding support to prevent the board from falling and warping;
2. Internal support (upper support device): Roll a large-diameter thin-walled cylinder to prevent the workpiece from collapsing or deforming due to its own weight;
3. Discharge side support: supports the formed cylinder for easy lifting by the crane;
4. Roller surface preheating and roller cooling device: selected for thick plate and special material rolling.
