Energy-saving structure and research of hydraulic equipment!Air band saw company

source:Industry News release time:2021-10-08 Article author:Rosit Popular:Air band saw

　　Energy-saving structure and research of hydraulic equipment

　　With the advancement and development of science and technology, the application of electro-hydraulic servo hydraulic systems (Hydraulic systems) in scientific research, experiments, engineering applications and other fields is becoming more and more extensive. However, with the development of the market economy and the widespread application, low efficiency and high operating costs have become very prominent problems. The main reasons are: (1) The flow and pressure of the oil source of the hydraulic system should be equipped according to the maximum load conditions or the maximum experimental capacity of the laboratory. In fact (Fact), the load conditions of the electro-hydraulic servo system are constantly changing, and the working time is often short under the maximum working conditions, and some equipment may even not use the maximum load at all. Many electro-hydraulic servo systems Work under small load conditions most of the time; at this time, only a small part of the flow of the hydraulic system oil source is used to meet the needs of the load speed, and most of the flow changes from the overflow valve to heat, which makes the oil temperature rise quickly . For example, a multi-channel electro-hydraulic servo system uses only part of the channels in many cases. On the other hand, in order to ensure the performance requirements of the system, the oil temperature needs to be controlled within a certain range (fàn wéi), so that the oil source system has to be equipped with a cooling device with sufficient heat dissipation area to cool the oil temperature. Caused a double waste.

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　　(2) The electro-hydraulic servo system itself has a large throttling loss (loss).

　　(3) Loss of other hydraulic components of the system.

　　Therefore, when designing and configuring the electro-hydraulic servo system, especially for the electro-hydraulic servo system with larger power, energy-saving measures (referring to the solution to the problem) must be considered. Taking the electro-hydraulic servo control system of the "three-channel seismic isolation bearing detection equipment" designed and manufactured by the author for a university as an example, the energy-saving measures taken are introduced.

　　1 The principle of the system is introduced as shown. The system is a three-channel electro-hydraulic control system composed of 3 motors (advantages and applications of variable frequency electric locomotives). The load conditions are respectively 23000kN servo actuator, 1000kN servo actuator, 300kN servo actuator, the maximum working pressure of the system is set by the pilot relief valve, and the electro-hydraulic proportional relief valve remotely controls the working pressure of the system under different load conditions. The hydraulic servo valve is controlled by a computer to realize the frequency, amplitude and force control of the servo actuator.

　　It can be seen from the schematic diagram that the characteristics of the system are that the load conditions are very different, and the three servo actuators will not be used at the same time, but according to the size of the test piece, the material of the test piece (Material), and the nature of the test (destruction ( (vandalism), fatigue, detection, etc.) Choose (xuanze) different servo actuators for loading.

　　The principle of the three-channel current servo hydraulic system (Hydraulic systems) energy-saving measures (pointer to the solution to the problem) In order to reduce the energy loss (loss) of the electro-hydraulic servo system, the author has taken the following measures: (1) Set up independent cooling system. In order to ensure the working performance of the hydraulic system, the oil temperature must be controlled within a certain range (fàn wéi), and a cooler with sufficient heat dissipation area must be installed in the system to ensure that the oil temperature is

　　Control, it is best to set the cooling system separately. When the oil temperature is lower than the set temperature, the cooling system does not work; when the oil temperature is higher than the set temperature, the cooling system is started, which not only ensures the cooling system The real-time control of the system can also be controlled in real time according to the oil temperature changes when the system is working under different working conditions and different temperature conditions, which avoids starting the cooling system at the same time when starting the oil source system, and achieves the purpose of energy saving. The hydraulic wrench transmits power to the working head through the high-pressure oil pipe and the hydraulic pump, which drives the working head to tighten or loosen the nut. The hydraulic pump can be driven by electricity or compressed air. The working head of the hydraulic wrench is mainly composed of three parts, the frame (also called the shell), the oil cylinder and the transmission parts. The output force of the oil cylinder, the piston rod of the oil cylinder and the transmission part form a motion pair. The distance from the center of the oil cylinder to the center of the transmission component is the hydraulic wrench amplification arm. The oil cylinder output multiplied by the arm is the theoretical output torque of the hydraulic wrench. The actual output torque is smaller than the theoretical output torque.

　　(2) The main pump adopts a constant pressure variable pump. When the constant pressure variable pump is working, when the load speed decreases, the excess flow will increase the pressure of the main oil circuit. At this time, the constant pressure variable organization (organization) reduces the displacement of the variable pump under the effect of this pressure increase, so that the output flow of the oil pump is reduced, the pressure of the main oil circuit no longer increases, and it is maintained in a certain pressure range (fàn wéi); vice versa. Because the variable control device is used to make the output flow of the oil pump change with the change of the load, the purpose of energy saving is achieved.

　　(3) The main pump can also be a manual variable pump. When the system load is not large, manually adjust the flow rate of the axial piston pump (unit: cubic meters per second) to reduce the pump flow rate, so as to achieve the purpose of energy saving.

　　(4) Multiple motor pump sets are used. The author designed the No. 1 pump 60L/mi

　　N, No. 2 pump 100L/mi

　　N, No. 3 pump 160L/min 3 kinds of flow combinations, when designing the oil source system of the pumping station, especially the large flow system, consider the use of multiple motor pump sets as much as possible to divide the large flow into several small flow motor pump sets. A single pump set can be started under a small load. The equipment manufacturing cost may increase slightly, but its operating cost can be effectively reduced (reduce). On the other hand, if a single high-power motor is used Pump unit composition, its start-up will greatly increase the capacity and performance requirements of the power grid and electrical appliances, and the maintenance cost may greatly increase. In general, for large flow and high power oil source systems, multiple motor pumps are used in pairs. Maintenance is better than the setting of a single high-power and large-flow motor pump set.

　　(5) Set electro-hydraulic proportional relief valve. An appropriate electro-hydraulic proportional relief valve is set in the oil source system, and the system pressure is set according to the load condition to reduce the energy loss of the system.