The flow rate of Rexroth Rexroth oil pump is the product of the gear pump displacement V per revolution and the speed n, if the speed n of the hydraulic pump is too low, the initial force Q will be too small, can not guarantee the oil supply of the system, resulting in the centripetal force is not enough or can not constitute a certain vacuum degree and can not absorb oil.
If the speed is too high, the output flow Q is more, but when the speed is too high, the hydraulic pump will be sucked into the process of oil absorption, which constitutes a lack of oil absorption, but reduces the flow rate, and also produces defects such as noise, vibration and aggravated wear, etc., it can be seen that the speed of the hydraulic pump can not be too low, nor can it be too high, and in the case of smoothness, it should be appropriate to work according to the speed given on the product sample.
Rexroth Rexroth oil pump speed is too low to dispose of
As for the problem of the low speed of the Rexroth Rexroth oil pump, it can be dealt with in two ways: one is to reduce the hydraulic pressure of the piston pump, which can reduce the loss of volumetric efficiency. Since the volume loss is related to the pressure difference, reducing the pressure difference can compensate for the volume loss caused by low speed. The second method is to increase the viscosity of the hydraulic fluid, which can also reduce the loss of volumetric efficiency.
Daily maintenance and maintenance of hydraulic pumps
1. Check items before the operation of the hydraulic pump
(1) Whether the installation of the hydraulic pump can be accurate and reliable, whether the screws can be tightened, and whether the coupling installation can meet the central requirements;
(2) Whether the pump body can be filled with oil;
(3) Whether the steering of the pump can be consistent with the oil inlet and outlet;
(4) Whether the safety valve of the hydraulic system can be adjusted to the regular pressure value
2. Matters needing attention during the operation of the hydraulic pump
The purpose is to sweep the air in the pipeline as much as possible, and gradually load after no-load operation after 1-2 m i n without abnormal phenomena during no-load operation, and there should be no abnormal vibration, noise and disclosure during the loading process, otherwise it should be stopped immediately for inspection and analysis, and the defects should be removed.
3. Maintenance of the hydraulic pump after the end of operation
If the pump is not used for a long time, the oil in the pump should be discharged, and then filled with oil with low acid content, and the exposed processing surface should be coated with anti-rust oil, and each oil port should be sealed with a screw plug to prevent dirt from entering.
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1. Adopt the correct Rexroth vane pump speed conversion method, the conversion mode of the solenoid valve, the impact is larger, the conversion accuracy is lower, the reliability is poor, but the control flexibility is large;
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Introduction to the classification of Rexroth relief valves
(1) Rexroth DBD direct acting relief valve: DBD valve is a direct-acting relief valve, which is used to limit the system pressure, with a total of 7 pressure levels: 2.5, 5, 10, 20, 31.5, 5, 40 and 63Mpa. The types of pressure adjustment are: adjustment handle, adjustment handle with lock, and adjustment screw with protective cover.
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Failure analysis of Rexroth drives
Common Failure Analysis:
1) Overcurrent fault: Overcurrent fault can be divided into acceleration, deceleration, and constant speed overcurrent. It may be caused by the acceleration and deceleration time of the inverter is too short, the load is abruptly changed, the load is unevenly distributed, and the output is short-circuited. At this time, it is generally possible to extend the addition and subtraction ...
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Rexroth solenoid valve model letter the meaning of each representative
EW stands for Exchange
EG stands for Direct Current
The meaning of each letter of Rexroth solenoid valve:
For example, 4WE6E6X/EG24N9K4
4→ 4-way (there are also 3-way) 4-way ports
6→ is 6
E→ functional symbols (also C, D, E, EA...)
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1. Determine the pressure
The rated pressure of the selected metering pump is slightly higher than the actual maximum pressure required, generally 10-20% higher. Don't choose too high, too much pressure will waste energy, increase the investment and operating costs of the equipment.
2. Determine the flow rate
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A test method for linear proportional control of CNC speed of Rexroth proportional valves
1. Remove the mold and cancel the express and trivial mold operation
2. Cancel the low-pressure trivia mold.
3. Close the safety door.
4. Adjust the CNC high-speed mold speed to the value of 0, and adjust the CNC high-speed mold opening speed and CNC low-speed mold opening speed to the value of 40.
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The causes and treatment methods of the unstable flow of Rexroth hydraulic pumps
1. Rexroth hydraulic pump has no flow rate.
In fact, this is broadly similar to the reason why Rexroth hydraulic pumps have no pressure as mentioned earlier. Here can be referred to by the explanation of the past period, and a few points can be added.
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When Rexroth hydraulic pump motor has air, how do we correctly eliminate it so that the pump is not damaged, and then share with you the correct exhaust method:
(1) The oil has a certain compressibility, resulting in noise, vibration and crawling of moving parts in the system.
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How to use Rexroth balance valves
1. The flow direction of the medium should be consistent with the direction of the arrow of the valve body;
2. The differential pressure balance valve should be installed on the return pipe, the valve is connected to the guide pipe, and the other end of the pressure guide pipe is connected with the water supply pipe, and it is recommended to install a 1/2" ball valve at the water supply end of the pressure guide pipe in order to start the function of eliminating blockage;
3、 ...
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Rexroth hydraulic pump - introduction to the characteristics of proportional valves
Proportional control valve is a kind of control valve that continuously and proportionally controls the flow, pressure and direction of the hydraulic system according to the input electrical signal, and its output flow and pressure can not be affected by load changes.
Compared with ordinary hydraulic components, proportional valves have the following characteristics:
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Single piston pump
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Applicable environmental conditions for Rexroth solenoid valves
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2) When the relative humidity in the environment is high and there are water droplets and rain, waterproof solenoid valves should be selected;
3) Special varieties should be selected for occasions such as vibration, bumps and shocks in the environment, such as marine solenoid valves;
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Rexroth Hydraulic Pumps - Introduction to the Classification of Proportional Valves
The classification of proportional valve control mode refers to the classification of the electrical-mechanical conversion mode in the pilot control valve of the proportional valve, and its electrical control part has various forms such as proportional solenoids, torque motors, DC servo motors, etc.
(1) Electromagnetic type Electromagnetic type refers to the use of proportional electromagnets.
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Rexroth solenoid valves are common faults
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Rexroth hydraulic pump - piston pump maintenance precautions
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2. Check the fit of the plunger pair. Insert the end of the plunger into the plunger sleeve, tilt it about 60°, and if the plunger can slide slowly under its own action, it will fit well.
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