2 Abstract The type and parameters of the hydraulic cylinder differential control loop are analyzed, and the ratio of the piston to the piston rod is derived according to the speed ratio condition. The introduction of the liquid cylinder in the night drive is the main component of the cooking. It should be extremely extensive in all kinds of mechanical equipment, especially the double-acting single-piston rod hydraulic cylinder. However, due to the different effective areas on both sides of the piston, the speed of expansion and contraction of such hydraulic cylinders is different. Such a hydraulic cylinder cannot satisfy the demand when the liquid supply amount of the two chambers is the same, or the extension speed is greater than the retraction speed. Although the double-bar hydraulic rainbow is used, or the liquid supply method of the two chambers is used, the expansion speed can be made equal, but the structure and the system are relatively complicated. At this time, if the differential control circuit is employed, the extension speed of the single-piston double-acting hydraulic cylinder can be increased, thereby satisfying the requirement that the extension speed is equal to or greater than the retraction speed.
1 Differential control circuit of the hydraulic cylinder's differential control circuit liquid jade cylinder. The essence is that the liquid discharged from the piston rod chamber of the liquid jade cylinder is returned to the piston chamber of the hydraulic cylinder, so that the flow into the piston chamber is the most. Correspondingly, the extension speed of the piston rod is increased, and a method for realizing differential control of the hydraulic cylinder is available.
1.1 Adoption, the type position reversing valve constitutes the differential circuit inside the valve, 1; 1. When the reversing valve is working in the left position, the piston rod chamber 02 is the discharge amount of the piston rod chamber, and the piston rod extension speed will be Increase accordingly.
1.2 Between the two chamber oil passages of the hydraulic cylinder, an alternate one-way valve is inserted to form the differential circuit after the valve. 2. At this time, an ordinary, type function position valve can be used. When the valve is in the left position, the liquid flows through the alternate check valve to enter the piston rod cavity, and the flow rate is 0. The retracting speed is 2; when the valve is in the right position, the oil entering the piston chamber of the hydraulic cylinder causes the valve to be in the valve. Or the plunger action, the piston rod cavity discharges back to the oil inlet pipe of the piston chamber by the valve person, and the flow into the piston chamber of the hydraulic cylinder is realized to form a differential return.
1.3 The position-passing valve is used to form the valve heterodyne loop. When the piston chamber is filled with liquid, the piston rod chamber return fluid enters the position of the valve to the left.
2 Parameter Analysis of Differential Control Hydraulic Cylinder The hydraulic cylinders controlled by the differential circuit have the same speed.
2.1 The expansion speed of the hydraulic cylinder is set to the liquid phase, regardless of the boundary efficiency. 2. The extension speed is 1 according to the left movement.
When the piston rod is extended, the flow rate discharged from the piston rod chamber is 2 and returns to the piston chamber, so that the total flow rate of the piston rod extension time is the piston rod extension speed, and the formula 1 is substituted into the type 3, and the simplified one can obtain 2.1. .2 retraction speed v2 Calculate the diameter of the piston or piston rod of the Dd night pressure cylinder according to the ordinary hydraulic cylinder.
As can be seen from Equation 45, it is only required to control. The value of the hydraulic cylinder can be adjusted to 2. The output force of the hydraulic cylinder is the same as the supply pressure, and the back pressure is zero, excluding the mechanical efficiency.
2.2.1 Thrust 1 is calculated according to the differential circuit. 2.2.2 Pulling force 2 According to the calculation of ordinary hydraulic cylinders, obviously, when the differential control circuit is used, the extension speed 1 is increased compared with the ordinary hydraulic cylinder, but the thrust body 1 will also be The corresponding reduction has been made.
2.3 Determine the geometrical relationship of the differential hydraulic cylinder according to the speed ratio requirement. The speed ratio of the hydraulic cylinder refers to the ratio of the retraction speed of the piston rod to the extension speed, that is, 9! . When the liquid supply amount 01 is the same, for the non-differentially controlled single-piston double-acting hydraulic cylinder, 9 is greater than 1; when differential control is used, 91.
According to the speed ratio relationship 19=2, the formula 4 can be substituted to obtain the hydraulic cylinder that meets the set speed ratio requirement and is related to the differential loop control, and the geometric parameters are generally determined according to the speed ratio 1. At this time, the relationship between the piston and the diameter of the piston rod should satisfy the formula 67, and the pushing and pulling force of the differential cylinder is equal under the above-mentioned structural size.艮å£3 Conclusion 1 Single-piston rod double-acting hydraulic cylinder can increase the extension speed of the piston rod when using differential circuit control, thus meeting some special requirements. However, its thrust will be reduced accordingly.
2 There are many ways to implement differential control. When there are multiple actuators working, to prevent interference, a 0-in-valve or post-valve differential circuit should be used; for a single actuator, a 0-out-of-valve differential circuit can be used.
3 The geometric parameters of the differential hydraulic cylinder can be designed according to the speed ratio requirements. Its 1 size can be determined according to Equation 8.
4 The speed ratio of the commonly used differential hydraulic cylinder 9 = that should meet the conditions of Equation 9. At this time, the expansion and contraction speed of the hydraulic cylinder is the same, and the pushing and pulling force is equal.
1 Li Changxi. Mining machinery hydraulic transmission elbow. Beijing Coal Industry Press. 1985.
2 Guan Zhongfan. Hydraulic drive system. Beijing Machinery Industry Press. 1981.
3 Lei Tianjue. Hydraulic Engineering Manual 1 cubit. Beijing Machinery Industry Press. 1992.
A spline roller is a handy tool used in the installation and repair of window screens and screen doors. It is specifically designed to assist in the process of inserting Screen Spline into the frame's groove, ensuring a secure and tight fit. The roller features a cylindrical wheel attached to a handle, allowing for smooth and controlled pressure as it rolls along the spline, pushing it into the groove. This tool is essential for both DIY enthusiasts and professionals, as it simplifies the task of installing or replacing screen spline, resulting in properly fitted screens that provide effective protection and ventilation.
Spline Roller,Window screens,Screen installation
Jinwu Glass Fiber Co., Ltd , https://www.jinwuwindows.com