Course design instruction of hydraulic transmission 1、 The purpose of hydraulic transmission course design 1, consolidate and deepen the learned theoretical knowledge, and master the general methods and steps of hydraulic system design and calculation. 2, exercise the ability of mechanical drawing, structural design and engineering calculation. 3. be familiar with and be able to use the relevant national standards, ministerial standards, design manuals, product samples and other technical data. 4Improve the ability of students to use computer drawing software (such as AutoCAD, Pro / E, etc.) for practical engineering design. 2、 Hydraulic course design topic Topic (2) design a hydraulic system of feeding machine, which requires the system to complete the semi-automatic cycle of fast rise - slow rise (adjustable speed) - fast fall - lower stop.The 900v type guide rail is adopted, the pressing force perpendicular to the guide rail is 60N, the starting and braking time is 0.5s, and the mechanical efficiency of the hydraulic cylinder is 0.9.The original design data is shown in the table below. Data number Evidence number I A kin d of III IV V 800 1000 1200 1400 1600 4500 5000 5500 5800 6000 40 45 50 55 60 350 350 400 420 450 Less than 10 Less than 13 Less than 16 Less than 18 Less than 20 100 100 100 100 100 45 55 55 60 65 400 450 500 550 600 II Self weight of slide (n) Dead weight of workpiece (n) Fast rising speed (mm / s) Rapid rising stroke (mm) Slow rising speed (mm / s) Slow rise stroke (mm) Fast descent speed (mm / s) Rapid descent stroke (mm) Try to complete the following work: 1. analyze the working condition and draw the working condition diagram. 2. schematic diagram of proposed hydraulic system (A3). 3. calculate the hydraulic system and select standard components. 4Draw the assembly drawing of hydraulic cylinder (A1). 5Prepare hydraulic course design instructions. The schematic diagram of the feeder is as follows: Fig. 2 Schematic diagram of feeder hydraulic Catalog I.Condition analysisTwo Two.Drawing of load and speed diagramFive Three.Determination of main parameters of hydraulic cylinderSix Four.Proposed hydraulic systemNine Five.Selection of hydraulic componentsTen Six.Design of hydraulic cylinderEleven Seven.Schematic diagram of proposed hydraulic systemFourteen Eight.Drawing the assembly drawing of hydraulic cylinderFourteen Nine.ReferencesFourteen 1、 Condition analysis The analysis of the working condition of the hydraulic transmission system is to make clear the changing law of the speed and load of each actuator in the working process, that is, to carry out the motion analysis and load analysis. 1. Kinematic analysis According to the speed of each stage of each actuator in a working cycle, draw a speed cycle diagram with speed as the ordinate and time or displacement as the abscissa to master the change of speed in a working cycle.As shown in the figure below: Diagram of speed change in working cycle 2. Dynamic analysis Dynamic analysis is to study the force on the actuator during the working process of the machine. Figure 2 shows the load displacement curve of the hydraulic system of the feeder. Load displacement curve 3. Load analysis Load analysis is to study the force of each actuator in each stage of a working cycle.When the working mechanism moves in a straight line, the load that the hydraulic cylinder must overcome is: Where: - working resistance - friction resistance - inertia resistance 1) Workload: The working resistance of this system is the self weight of the workpiece and the self weight of the slide. 2) Friction load: The friction resistance of this system is related to the shape, placement and movement of the guide rail. This system is V-shaped guide rail, which is placed vertically, so ---Friction factor A-V angle, generally 90 ° Since the work piece is started vertically, the load acting vertically on the guide rail can be obtained from the clearance and structure size : positive pressure of moving parts and external load on supporting surface. : friction coefficient, divided into static friction coefficient (generally 0.2-0.3, generally 0.05-0.1) So take: There are: static friction load: Dynamic friction load: 3 ) Inertia load Inertia load is the load generated by the inertia of moving parts when their speed changes. It can be calculated by Newton's second law: G --- weight of moving parts (n) G --

docxDoc Design specification for hydraulic system of feeding machine

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