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Design and Research of Machine Tool Hydraulic Balance System Analysis Shanghai Grinder Research Institute 200093 Lu Huiqin Calculation Method Introduction The vertical moving parts of the machine tool are not only affected by the driving force of the driving force, but also by the gravity of its own weight. Due to the direction of action of the force and the direction of movement of the component, it cannot be supported by the support like the horizontally moving component. If this gravity is not compensated. It will have a bad influence on the smoothness of the movement of the components, and in serious cases, it will cause loss of control.
In the past, the power of vertical moving parts of machine tools was often compensated by mechanical dosing methods, but the following disadvantages were caused by the fact that rigid joints could not be used between the parts and the counterweights, and the chains had to be chained to the parts by means of steering wheels. In addition, in some cases, such as the vertical moving parts of the gantry machine, the column mobile machine cannot use the mechanical and heavy balance method.
In front of the mouth. 1 Inter-provincial modern machine tool rarely picks up the mechanical balance of the machine. The method of liquid balance is to increase the hydraulic pressure of the component in the component, Ï€ å–¾æ¶å—å–¾æ¶, Xiang, and usually use the balance cylinder to offset the effect of the coin. The work of positive balance is as typical as the hydraulic balance circuit. The sequential valve balance circuit is the most commonly used balance circuit in the past. The principle 3 has a small flow pressure characteristic. 4. Due to the poor opening and closing characteristics of the sequence valve, pressure jump occurs when the motion is reversed.
Used to reset the balance difference. Due to the limitation of the sequential opening and closing characteristics, the difference of the claw force when the balance cylinder moves in the forward and reverse directions is large. Therefore, the balance accuracy is poor, the leakage brings the leakage of the system, and the balance 觎 cannot stay at any position for a long time.
With the development of machine tool manufacturing technology, the speed of movement of modern machine tool components is getting faster and faster, and the demand for smoothness of the movement of the parts is higher. Need to be more precise on the gravity of the component. 3. Change the balance of the pump and the relief valve. Principle 7. The characteristics of the circuit are low. 4 is better than the balance system. Avoid the interference of other execution components on the balance system. 7 The balanced circuit flow pressure characteristics of the variable pressure pump and the relief valve are poor. 8 There is a pressure jump in the motion commutation.
1. The system has less heat and has little influence on the thermal deformation of the machine tool. At present, the circuit is often used for the machine with a low speed of moving parts.
The balance circuit of the balance valve of April 1 is small in principle 9 p. Features: The liquid pump can use ten other actuators.
Adjusting the balance pressure due to the balance of the 8 variable pump and the relief valve balance the return flow 1 force characteristic, the pressure emblem pressure jumps.
In the 1970s, the balance circuit of the overflow pressure reducing valve was widely used in the international processing centers in the 1970s. The principle of 5.
Said that the flow pressure characteristic 6 of the overflow relief valve determines the flow pressure characteristics of the system, and there is a slight pressure jump during the movement reversal... The mountain is under the pressure of the overflowing mouth, and the balance is set. Poor 1. The accumulator must be inspected regularly.
Currently. Therefore, the road is often used for CNC machine tools with high requirements for smoothness of component motion.
5. The principle of the balance circuit of the electro-hydraulic proportional valve is as follows: The dynamic characteristics are good 1. The balance accuracy The high-flow pressure characteristic curve uses the electronic adjustment technology to maintain the balance of the force in the stage of the movement.
Sn. Flow pressure characteristics of the electrohydraulic proportional reversing valve balance circuit 1. Manufacturing cost bureau = At ​​present, this circuit is often used in the case where the component motion stability requirement is high, and the design calculation of the balance loop is determined according to the weight of the component. 1 If the weight of the part is small, in order to avoid the balance, the cylinder is too small. Yes, 61 = one of them, for balance. 1 is the circuit 1 IX. According to the standard series of cylinders, the standardization circuit is taken. The flow rate Q25kkcFvIJnun is the coefficient of the moving speed of the component. The speed and control precision of the modern machine tool components are continuously improved. The smoothness of the movement also raises higher requirements.
Hydraulic balancing technology with electronic adjustment technology will also replace traditional mechanical balancing methods. Energy-efficient systems and components have great potential for development. Liquid-electricity can adapt to the continuous development of machine tool manufacturing technology, which is the direction of our machine tool hydraulic engineering technicians.