1. The bearing of the hydraulic motor can withstand the radial force, and the transmission parts such as the pulley shall not be directly installed on the spindle for the motor that cannot withstand the radial force.
The driving sprocket is driven by a hydraulic motor, and the driven sprocket drives the conveyor belt roller. According to the user, the motor often leaks oil, and the seal ring starts to leak less than 3 months after it is replaced. What causes an oil spill? The hydraulic motor drives the pulley through the chain drive, and because the chain drive also generates radial force, the oil seal deforms after being subjected to the radial force, resulting in oil leakage.
2. Hydraulic motor chain drive
(1) The motor leakage oil pipe should be unblocked, generally not connected to the back pressure, when the leaking oil pipe is too long or connected to the back pressure due to a certain need, its size shall not exceed the allowable value of the low-pressure seal.
(2) The external leakage oil should be able to ensure that the motor shell is filled with oil, and prevent all the oil in the shell from flowing back to the oil tank during shutdown.
(3) For the motor with a long downtime and cannot be directly operated at full load, it should be used normally after a period of idle operation.
3. The frame where the motor is installed should have sufficient rigidity
(1) The bracket and base of the motor must have sufficient rigidity to withstand the reaction force acting on the motor when the motor outputs torque.
(2) The insufficient stiffness of the frame where the motor is installed will cause vibration or deformation, and even accidents will occur, and the concentricity of the connection between the drive machine and the motor shaft cannot be guaranteed to be controlled within 0.1mm.
4. The hydraulic motor and gearbox should not be used together
(1) One of the characteristics of hydraulic transmission is that the power-to-weight ratio is large, and in general, the hydraulic motor circuit itself can complete the usual speed regulation and speed change functions.
(2) If the hydraulic motor is used together with the gear gearbox, the characteristics of hydraulic control will be lost, and the volume and cost of the equipment will be significantly increased.
5. The oil drain port of the hydraulic motor should be returned to the oil tank separately
(1) Although all the oil return pressure is not high from the general concept, the oil return in many hydraulic systems still has a certain pressure, and the oil drain chamber of the hydraulic motor is not allowed to have pressure.
(2) The inside of the oil drain port of the hydraulic motor is connected to the cavity of the shell, and the shaft seal of the motor shaft only plays a sealing role, not pressure resistance. If this port is connected with other oil return pipelines, it is easy to cause damage to the motor shaft seal and lead to oil leakage, so it is not allowed to connect the oil drain port of the hydraulic motor with other oil return pipelines.
6. Air should not enter the hydraulic motor
(1) During the initial operation of the hydraulic system, it is inevitable that it will contain air in the pipes of the system.
(2) An important part of system debugging is to exhaust the air in the system, which is especially important for hydraulic motors.
(3) The hydraulic medium in the motor has a process from high pressure to low pressure suddenly, and the frequency of the process is very high, on average about 10 times per revolution.
(4) When the hydraulic oil entering the motor contains air, cavitation will occur locally at the sudden change in pressure, so that the motor will be damaged quickly.
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Classification and function of Rexroth pressure control valves
1. Rexroth relief valve
Overflow, pressure stabilizer, which is used to regulate and maintain the oil supply pressure of the pump while overflowing the excess oil in the system. When the regulated pressure is reached, the hydraulic system is controlled to keep it in a constant state. Relief valves for overload protection are called safety valves. ...
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Introduction to the features of Rexroth's variable displacement piston pump A4VG series
1. Closed-loop hydrostatic drive swash plate axial piston variable pump;
2. The flow rate is proportional to the driving speed and displacement, and can be a stepless variable;
3. With the change of the swing angle of the swash plate, the flow rate increases from 0 to the maximum;
4. The swash plate swings in the middle position, which can be ...
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How Rexroth hydraulic pumps are adjusted
How Rexroth hydraulic pumps are adjusted
1) Swash plate axial piston variable pump, used for open hydraulic rotation back
2) Mainly used in the field of mobile machinery
3) The pump works under the condition of self-priming, mailbox pressurization or with built-in suction pump, (centrifugal pump).
4 ...
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Types and characteristics of Rexroth gear pumps
Classification and structural characteristics of Rexroth gear pumps
According to the form of gear meshing, it can be divided into external meshing and internal meshing.
According to the different tooth curves, it can be divided into: involute and cycloid.
According to the surface form, it can be divided into spur gear type, helical gear type, herringbone gear ...
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Rexroth A6V series hydraulic motors are available in several variant forms
(1) HD (Hydraulic Variable) Type: Adjust the output torque and speed by controlling the swing angle of the motor block with external hydraulic oil.
(2) HA (Pressure Variable) type: When the pressure reaches the set value, the motor changes the swing angle with the change of load, thereby changing the output torque and speed. Among them, the main one is constant pressure type (HA1) ...
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Rexroth solenoid valves are common fault problems
1) Cannot be opened or closed normally
1. Check the power supply and make sure the voltage and frequency are correct. Also check the connection.
2. Check whether there is dirt, corrosion underneath, and the coil will not burn out or lose components.
3. Check whether the flow direction is related to the indicator on the valve body or with the valve ...
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Rexroth launches ctrlX OS operating system for third-party hardware
Automation is even more open and free
Available for all tiers, from on-site to cloud
The software stack is strengthened and the network security is extremely high
Connect with ctrlX Store and ctrlX Device Portal
The Linux operating system ctrlX OS is now available for the third ...
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What are the application ranges of Rexroth oil pumps?
1) Piston pumps are generally used in the hydraulic transmission systems of machine tools, metallurgy, forging, mining and hoisting machinery, and are especially widely used in high-power hydraulic transmission systems.
2) REXROTH vane pumps are generally used in mining, coal, metallurgy, chemical industry, environmental protection and other industries. One...
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What should be paid attention to in the maintenance of Rexroth oil pump?
1. Water will corrode the oil pump, so it is forbidden to use the oil pump to vacuum the substance containing water.
2. For substances containing a large amount of solvent, remove most of the solvent in the oven first, and then use an oil pump to vacuum.
3. Use the vacuum pump in the correct order to prevent suck-back. ...
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Introduction to the basic features of Rexroth piston pumps
Volumetric efficiency (actual discharge/theoretical discharge) rotates at low speed, and internal leakage increases when used at high pressure, and efficiency decreases.
Solid shaft dynamics (theoretical shaft dynamics/mechanical efficiency): number of rotations, increased pressure, increased mechanical efficiency.
Real discharge (volumetric efficiency), real axis power and number of rotations ...
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How to adjust Rexroth A11V hydraulic pump?
In general, there are two ways to adjust it
1. Add a speed regulating valve at the outlet of the pump to adjust the output speed of the oil volume, so as to achieve the amount of oil used
2. Add a variable pump with oil volume, adjust the angle of the oil pan to achieve the input quantity of changing the oil volume. This method compares ...
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A higher level of openness and freedom: ctrlX OS
In 2020, Bosch Rexroth took a big step forward on the road to automation openness with the ctrlX AUTOMATION automation automation platform based on the "Industrial Automation Smartphone" concept. In 2021, Bosch Rexroth made the leap from an open platform to an industrial ecosystem. Co-creation ...
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Test method for linear proportional control of numerical control pressure of Rexroth proportional valves
1. The position of the four "flow and pressure limit control" potentiometers on the CPU unit of the computer.
2. The preset parameters adjust the four-stage injection speed to 50 and the pillow pressure to 00
3. Start the oil pump motor, and when the temperature of the sol barrel reaches the sol temperature, press the manual injection button to make the screw ...
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Analysis of common failures of Rexroth piston pumps
1. The pressure of Rexroth piston pump cannot rise:
1. Rexroth piston pump does not have oil or insufficient flow - the same as the above elimination method.
2. The adjustment pressure of the relief valve is too low or faulty - re-adjust the pressure of the relief valve or repair the relief valve.
3. There is a leak in the system.
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Features of Rexroth hydraulic pumps:
1) The flow rate of the pump is proportional to the speed and displacement of the pump, and the swing angle of the swash plate can be adjusted steplessly
2) Coaxial structure, which can form a combined pump
3) Position-constrained backhaul structure
4) Spherical distribution, the plunger is arranged obliquely around the main axis
5) Stepless ...
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Rexroth oil pump cartridge replacement operation
Rexroth oil pump is a hydraulic system that converts the mechanical energy of the prime mover (motor, internal combustion engine, etc.) into liquid pressure energy.
Rexroth oil pumps can be divided into two types: positive displacement and non-volumetric type. The non-volumetric type has centrifugal pumps, axial flow pumps, etc., and uses high-speed rotating impellers to produce true ...
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Disassembly and cleaning steps for Rexroth hydraulic valves
(1) Disassembly. For hydraulic valves, although most of the parts are connected by bolts, the hydraulic valve is not disassembled when designed, and if it is forcibly disassembled due to lack of special equipment or lack of professional technology, it may lead to damage to the hydraulic valve. ...
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How to adjust the pressure flow rate of Rexroth constant pressure variable hydraulic pump?
1. First of all, adjust the pressure adjustment screw of the Rexroth variable hydraulic pump relief valve to the loosest state, the minimum flow limiter to the minimum state (the upper hydraulic cylinder adjusting screw is adjusted to the loosest state), the flow control valve adjustment screw is adjusted to the tightest state, and connect a flow rate in series after the flow valve.
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Rexroth vane pump working principle and classification introduction
How Rexroth vane pumps work:
1. Single-acting vane pump
The pump is composed of parts such as rotor 1, stator 2, blade 3, oil distribution pan and end cover. The inner surface of the stator is a cylindrical hole. There is eccentricity between the rotor and stator. The blades slide flexibly in the rotor slots ...
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Rexroth solenoid valves are common faults
Rexroth solenoid valves are composed of solenoid coils and magnetic cores, and are valve bodies containing one or several holes. When the coil is energized or de-energized, the operation of the core will cause the fluid to pass through the valve body or be cut off to change the direction of the fluid. The solenoid parts of the solenoid valve are composed of a fixed core, a moving core...
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