Drive system of hydraulic press
The driving system of hydraulic press mainly includes two types: direct pump drive and pump accumulator drive. The pump of the direct drive system supplies high pressure working fluid to the hydraulic cylinder, the valve is used to change the direction of liquid supply, and the relief valve is used to adjust the limited pressure of the system, and at the same time, it plays a safe overflow role. This kind of drive system has few links and simple structure. The pressure can automatically increase or decrease according to the required working force, thus reducing the power consumption. However, the capacity of the pump and its driving motor must be determined by the maximum working force and maximum working speed of the hydraulic press. This type of drive system is mostly used in small and medium-sized hydraulic presses, as well as large-scale (such as 120000 KN) free forging hydraulic presses driven directly by pumps.
Pump accumulator drive there is one or a group of accumulators in this drive system. When the high-pressure working fluid supplied by the pump has a surplus, it is stored by the accumulator; when the supply is insufficient, it is supplied by the accumulator. With this system, the capacity of pump and motor can be selected according to the average consumption of high-pressure working fluid, but because the pressure of working fluid is constant, the power consumption is large, and the system has many links and the structure is relatively complex. This kind of drive system is mostly used in large hydraulic press, or several hydraulic presses are driven by a set of drive system.
Structure type of hydraulic press
According to the direction of the force, there are two types of hydraulic press: vertical and horizontal. Most of the hydraulic presses are vertical, while the extrusion presses are mostly horizontal. According to the structure type, the hydraulic press has double column, four column, eight column, welded frame and multi-layer steel belt winding frame, etc. the medium and small vertical hydraulic press also has C-type frame type. C-frame hydraulic press is open on three sides, easy to operate, but poor rigidity. The welding frame type hydraulic press for stamping has good rigidity, open in front and back, but closed in left and right. In the vertical four column free forging hydraulic press, the oil cylinder is fixed in the upper beam, and the plunger is rigidly connected with the movable beam. The movable beam is guided by the column and moves up and down under the pressure of the working fluid. The beam has a table that can be moved back and forth. The upper anvil and the lower anvil are respectively installed under the movable crossbeam and on the worktable. The working force is borne by the frame composed of upper and lower beams and columns. Large and medium-sized free forging hydraulic press driven by pump accumulator usually adopts three working cylinders to obtain three-stage working force. The working cylinder is also provided with a balance cylinder and a return cylinder which exert force upward.
Classification of hydraulic press
According to the structure, it is mainly divided into: four column type, single column type (C type), horizontal, vertical frame, universal hydraulic press, etc.
It can be divided into metal forming, bending, stretching, blanking, powder (metal, non-metallic) forming, pressing, extrusion, etc.
Hot forging hydraulic press
Large forging hydraulic press is one of the most widely used equipment in forging industry, which can complete all kinds of free forging process. At present, there are 800t, 1600t, 2000t, 2500t, 3150T, 4000t and 5000t forging hydraulic presses.
Four column hydraulic press
The hydraulic press is suitable for the pressing process of plastic materials. Such as powder products molding, plastic products molding, cold (hot) extrusion metal forming, sheet stretching and cross pressing, bending pressing, turning through, correction and other processes.
Four column hydraulic press can be divided into four column two beam hydraulic press, four column three beam hydraulic press, four column four beam hydraulic press, etc.
Single arm hydraulic press (single column hydraulic press)
The hydraulic cylinder stroke can be extended (optional) by using the three-dimensional space, and the maximum telescopic range is 260mm-800mm, and the working pressure can be preset; the cooling device of the hydraulic system.
Gantry hydraulic press
The machine parts can be assembled, disassembled, straightened, calendered, stretched, bent, punched and so on, so as to realize the multi-purpose of one machine. The working table of the machine can move up and down, and the size of the machine expands the opening and closing height of the machine, so it is more convenient to use.
Double column hydraulic press
This series of products are suitable for pressing, bending and shaping of various parts, indentation, flanging, punching and shallow drawing of small parts, forming of metal powder products, etc. It adopts electric control, with inching and semi-automatic circulation, which can keep pressure and delay, and has good slide guiding property. It is easy to operate, easy to maintain, economical and durable. According to the needs of users, it can add thermal instrument, ejection cylinder, stroke digital display, counting and other functions.