附件244 Contents（目录) Instructor of Experimental Projects (English).-20 实验指导书（中文）21-32
附件 24.4 1 Contents（目录） Instructor of Experimental Projects（English）.2-20 实验指导书（中文）.21-32
附件24.4 Experiment 1 Experiment of assembling gear pump of CB type 1.General description The greatest advantages of gear pumps are:small size.light weight,reliable.easy to manufacture,low cost and less sensitive to pollution of hydraulic oil,convenient maintenance and repair,etc.Consequently,gear pumps are found widely applications in low-pressure hydraulic system(general in 25 kg/cm2 or less).The shortages of gear pumps are that it has more leakage-level and the gear bearing undertake larger pressure which lead the gear pump to be only applicable to low-pressure hydraulic system.As a result of large flow pulsation and pressure pulsation,very favorable low sound levels can not be achieved.what's more,it can only be used as a fixed delivery pump.But,as some structural improvement measures are taken in the gear pumps.it can reach a higher working pressure CB-type gear pump is designed and manufactured by own designers and manufacturing engineers in our country.It's working pressure is 25 kg/cm2.We make a little improvement in the structure to accommodate the needs of the high-pressure hydraulic system (to realize the automatic compensation of the axial clearance such as a floating bushing or a floating sideboard is set between the gears and the front and rear covers in the gear pumps with high pressure).So we can make the outlet pressure of the gear pumps to reach 70~140kg/cm2 By considering the structure of gear pumpsWe can satisfactorily resolve the problem of axial clearance.Unbalanced hydraulic radial force,Phenomenon of surrounded oil and so on. 2.The purpose of the experiment Understand the Principle of assembly and structural characteristics of CB-type gear pumps 3.Equipment of experimental CB-type gear pump,OB-B-type gear pump,CB-G-type gear pump,CB-H-type gear pump
附件 24.4 2 Experiment 1 Experiment of assembling gear pump of CB type 1、General description The greatest advantages of gear pumps are: small size, light weight, reliable, easy to manufacture, low cost and less sensitive to pollution of hydraulic oil, convenient maintenance and repair, etc. Consequently, gear pumps are found widely applications in low-pressure hydraulic system( general in 25 kg / cm 2 or less) .The shortages of gear pumps are that it has more leakage-level and the gear bearing undertake larger pressure which lead the gear pump to be only applicable to low-pressure hydraulic system. As a result of large flow pulsation and pressure pulsation ,very favorable low sound levels can not be achieved. what’s more , it can only be used as a fixed delivery pump.But ,as some structural improvement measures are taken in the gear pumps,it can reach a higher working pressure. CB-type gear pump is designed and manufactured by own designers and manufacturing engineers in our country.It’s working pressure is 25 kg / cm 2 . We make a little improvement in the structure to accommodate the needs of the high-pressure hydraulic system (to realize the automatic compensation of the axial clearance such as a floating bushing or a floating sideboard is set between the gears and the front and rear covers in the gear pumps with high pressure). So we can make the outlet pressure of the gear pumps to reach 70～140kg / cm 2. By considering the structure of gear pumps ,We can satisfactorily resolve the problem of axial clearance, Unbalanced hydraulic radial force ，Phenomenon of surrounded oil and so on. 2、The purpose of the experiment Understand the Principle of assembly and structural characteristics of CB-type gear pumps. 3、Equipment of experimental CB-type gear pump, OB-B-type gear pump ,CB-G-type gear pump, CB-H-type gear pump
附件24.4 4 The points for assembly and notes for attention (1)Select components carefully and keep them clean (2)Can not change the shape of every parts such as rounding chamfer,Round Edges and so on. (3)Needles which can not be left out should be filled with the inner ring of the Bearing Block.Needle bearing should be pressed into the vertical hole of the front and rear covers Needles should be flexible to rotate in the Bearing retainer (4)When parallel key of the Minor axis and long axis matches with the gear,their lateral clearance should not be too large.Of course,top surface can not be a collision and friction and Shaft and gears can be easy to promote within.What's more.Axis should not produce the phenomenon of radial swing in gear (5)CB-type gear pumps have 0.13~0.16 mm for the radial clearance and 0.03 mm for the axial clearance. (6)Rotating the Driving shaft(long axis)after the gear pumps is Completed assembled.To ensure that it is rotated by hand without let or hindrance. (7)Should pay attention to switch of lateral plate and it's Installation position for the high-pressure pumps with automatic compensating device to oil pressure. (8)Laboratory report for assembling gear pump of CB Type Experimental date Indoor temperature_ Major Class _Group_ Name Advisor Answer the following questions
附件 24.4 3 4、The points for assembly and notes for attention (1) Select components carefully and keep them clean (2) Can not change the shape of every parts such as rounding chamfer, Round Edges and so on. (3) Needles which can not be left out should be filled with the inner ring of the Bearing Block. Needle bearing should be pressed into the vertical hole of the front and rear covers. Needles should be flexible to rotate in the Bearing retainer. (4) When parallel key of the Minor axis and long axis matches with the gear, their lateral clearance should not be too large. Of course, top surface can not be a collision and friction and Shaft and gears can be easy to promote within. What’s more, Axis should not produce the phenomenon of radial swing in gear. (5) CB-type gear pumps have 0.13 ~ 0.16 mm for the radial clearance and 0.03 mm for the axial clearance. (6) Rotating the Driving shaft (long axis) after the gear pumps is Completed assembled. To ensure that it is rotated by hand without let or hindrance. (7) Should pay attention to switch of lateral plate and it’s Installation position for the high-pressure pumps with automatic compensating device to oil pressure. (8) Laboratory report for assembling gear pump of CB Type Experimental date_._._ Indoor temperature_ Major_ Class _ Group_ Name_ Advisor_ Answer the following questions
附件24.4 (1)What is the relationship between the rotation direction of gear pump with it's location of suction and displacement port? (2)State points that how the gear pumps solve the problem of unbalanced hydraulic radial force and Phenomenon of surrounded oil by observing the structure of it (3)What are the main factors which impact the gear pump to raise the working pressure? What Corresponding measures should be taken for High-pressure gear pump structure in generally Experiment 2 Experiment of assembling vane pumps of YB type 1.General deseription The greatest advantages of gear pumps are:smooth movement,low noise,large flow pulsation and high volumetric efficiency.But it also has some shortages,such as Poor performance of self-priming suction,Speed should not be too high,Sensitive to the pollution hydraulic oil,Complex structure and soon Vane pumps may be either of the single-acting or double-acting type.The former could be used for variable displacement pumps with lower pressure While the latter for fixed displacement pumps with the working pressure reaching to 65~140 kg/cm2 YB-type Vane pump is a double-acting pumps with good performance,which is designed and manufactured by own designers and manufacturing engineers in our country.It's greatest advantages are that YB-type Vane pump has symmetrical structure to bear counterbalance so that rotor bears litter radial force.The pressure of YB-type Vane pump can reach to 63 kg/cm2and the volumetric efficiency can reach to9% 2.The purpose of the experiment X
附件 24.4 4 (1) What is the relationship between the rotation direction of gear pump with it’s location of suction and displacement port? (2) State points that how the gear pumps solve the problem of unbalanced hydraulic radial force and Phenomenon of surrounded oil by observing the structure of it (3) What are the main factors which impact the gear pump to raise the working pressure? What Corresponding measures should be taken for High-pressure gear pump structure in generally. Experiment 2 Experiment of assembling vane pumps of YB type 1. General description The greatest advantages of gear pumps are: smooth movement, low noise, large flow pulsation and high volumetric efficiency. But it also has some shortages, such as Poor performance of self-priming suction, Speed should not be too high, Sensitive to the pollution hydraulic oil, Complex structure and so on . Vane pumps may be either of the single-acting or double-acting type. The former could be used for variable displacement pumps with lower pressure While the latter for fixed displacement pumps with the working pressure reaching to 65～140 kg / cm 2 . YB-type Vane pump is a double-acting pumps with good performance, which is designed and manufactured by own designers and manufacturing engineers in our country. It’s greatest advantages are that YB-type Vane pump has symmetrical structure to bear counterbalance so that rotor bears litter radial force. The pressure of YB-type Vane pump can reach to 63 kg / cm 2 and the volumetric efficiency can reach to 90% 2. The purpose of the experiment
附件24.4 Understand the Principle of assembly and structural characteristics of YB-type Vane pumps. 3.Equipment of experimental Several YB-type Vane pump for assembly 4.The points for assembly and notes for attention (1)The parts must be carefully cleaned to ensure that it does not contain any cutting chip and other pollutants before assembling (2)Vane can rotate in internal slot of rotor flexibly and freely.The clearance between them is0.015~0.025mm (3)The height of vane is0.005 mm which is lower than that of rotor. (4)The rotor and stator should be maintained in the direction of the original.Convince that the installation is not reversed (5)Control the Axial clearance in the scope of .04~0.07mm. (6)when tightening the Screw,force should be uniform. (7)Rotating the driving shaft after the gear pumps is completed assembled to ensure that it is rotated by hand without let or hindrance (8)Laboratory report for assembling Vane pumps of YB type Experimental date Indoor temperature Major Class _Group Name Advisor Answer the following questions 1 What is the main difference between the single-acting and double-acting vane pumps? 5
附件 24.4 5 Understand the Principle of assembly and structural characteristics of YB-type Vane pumps. 3. Equipment of experimental Several YB-type Vane pump for assembly 4. The points for assembly and notes for attention (1) The parts must be carefully cleaned to ensure that it does not contain any cutting chip and other pollutants before assembling. (2) Vane can rotate in internal slot of rotor flexibly and freely. The clearance between them is 0.015～0.025 mm . (3) The height of vane is 0.005 mm which is lower than that of rotor. (4) The rotor and stator should be maintained in the direction of the original. Convince that the installation is not reversed. (5) Control the Axial clearance in the scope of 0.04 ~ 0.07 mm. (6) when tightening the Screw ，force should be uniform. (7) Rotating the driving shaft after the gear pumps is completed assembled to ensure that it is rotated by hand without let or hindrance (8) Laboratory report for assembling Vane pumps of YB type Experimental date_._._ Indoor temperature_ Major_ Class _ Group_ Name_ Advisor_ Answer the following questions １、What is the main difference between the single-acting and double-acting vane pumps？