Common faults and troubleshooting of hydraulic press directional control valve

03 Dec 2021

Due to the difference in neutral function, diameter and control mode, hydraulic directional control valves have many varieties, but their principles are similar. In practical applications, electromagnetic (liquid) directional valves are the most widely used. The common faults and troubleshooting of electromagnetic reversing valve in installation and use are as follows. 1. The AC solenoid coil is burnt out a. Insulation of the coil is poor, which causes the inter-turn disconnection and burns. The coil must be replaced. b. The supply voltage is higher than the rated voltage of the electromagnet, causing the coil to overheat and burn. c. The power supply voltage is too low, so that the electromagnet current is too large, causing overheating and burning the coil. d. The axis of the electromagnet core and the axis of the valve core are too poor in coaxiality, and the armature cannot be attracted, causing overheating and burning. At this time, the electromagnet should be disassembled and rea...

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Pollution Control of Hydraulic Oil of Hydraulic Press

25 Nov 2021

Practice has proved that the pollution of the hydraulic oil of the hydraulic machine is the main reason for the failure of the system, and it seriously affects the reliability of the hydraulic system and the life of the components. Due to the contamination of hydraulic oil in hydraulic machines, the actual service life of hydraulic components is often much lower than the design service life. Therefore, the correct use, management and pollution control of hydraulic fluid in hydraulic machines are important means to improve system reliability and extend the service life of components. 1. Types and hazards of pollutants Pollutants in hydraulic systems refer to solid particles, water, air, chemical substances, microorganisms, and pollution energy contained in the oil. After the hydraulic oil of the hydraulic machine is contaminated, the following adverse consequences will be caused to the system and components. ①Solid particles accelerate the wear of components, block gaps and oil filters,...

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How to eliminate the defects of pressure control of hydraulic equipment

17 Nov 2021

1. Measures to eliminate hydraulic shock of unloading and reversing The high-pressure and large-flow hydraulic circuit will have pressure shocks during unloading or reversing, and cause severe vibration. The basic methods to eliminate such problems are as follows. (1) Pre-release the pressure in the circuit. When people release the pressure energy enclosed in the hydraulic cylinder in a proper way, and then manipulate the main hydraulic system, the pressure shock can be eliminated. There is a two-position two-way solenoid valve in the upper cavity oil circuit of the hydraulic cylinder for pressure relief. When the work is completed and before the main reversing valve changes direction, the pressure relief valve is energized and connected with the help of a time relay for about 3 to 5 seconds. When the loop pressure drops to 0 or close to 0, the main reversing valve is switched on again. There will be no pressure shock. Note that the piping of the pressure relief valve must be small eno...

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Features of hydraulic press

12 Nov 2021

As a general non-cutting forming processing equipment, hydraulic press works based on the use of liquid pressure to transfer energy to complete various pressure processing. Its work characteristics: First, the power transmission is "flexible" transmission, which is not as complicated as the power transmission system of machining equipment. This driving principle avoids the situation of machine overload; The second is that there is only a single linear driving force in the stretching process of the hydraulic press, and there is no "angled" driving force, which makes the processing system have a longer life span and a high workpiece yield. The hydraulic press has three basic action modes: single action, double action, and triple action. In the single-action mode, the indenter (or sliding plate) is used as a moving part to move in one direction to complete the pressing process. There is no crimping device in this way of working. Single-action presses are mainly used in the forming of thin...

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The history, current situation and development trend of hydraulic press

04 Nov 2021

With the rapid development of China's industry, the shortcomings of domestic forging equipment have become increasingly prominent. Among them, the forging equipment with its own property rights is at a relatively low level, while the forging equipment in developed countries is currently facing a large-scale, high-speed, and modern development. Fast mold, reliable operation, low noise, good protection and high precision. In recent years, CNC systems have been developed, and electronic computers, industrial robots, automatic mold changing systems and automatic warehouses have been developed. Combined, a series of flexible manufacturing cells (FMC) and flexible manufacturing systems (FMS) are formed, and they are connected with the computer integrated manufacturing system (CIMS). In order to occupy as much share as possible on the competitive platform, we urgently need to concentrate on the development of domestic forging equipment. Hydraulic press is one of the most widely used equipment...

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History of hydraulic press

27 Oct 2021

As early as 1662, Pascal discovered the possibility of using liquids to generate great power. In 1795, the British Bramah obtained the patent for the first manual hydraulic press, but the development history of the real hydraulic press was less than 200 years. With the development of Western capitalism, the invention of the steam engine triggered a revolution in industrial production, and modern large-scale industry gradually replaced the handicraft industry. The forging process with a long history has gradually changed from manual forging to machine forging. At the beginning of the 16th century, the first hydraulic mechanical hammers appeared. In 1839, the first steam hammer appeared. Since then, with the rapid development of the machinery manufacturing industry, the size of forgings has become larger and larger, and the weight of the forging hammer has exceeded 100t. Such a heavy forging hammer is difficult to operate and has huge vibration, which brings many problems. From 1859 to 1...

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