Created on:2021-12-15 14:19

Installation of hydraulic equipment_ Installation of hydraulic pump, motor and other components

Installation of hydraulic equipment_ Installation of hydraulic pump, motor and other components

1. Installation of hydraulic pump and hydraulic motor

(1) During installation, the joint surface of oil pump, motor, support and base must be free of rust, protruding spots and paint layer. A thin layer of antirust oil shall be coated on these joint surfaces.

(2) When installing the hydraulic pump, support and motor, the coaxiality tolerance and parallelism tolerance between the two shafts of the pump and motor shall meet the regulations, or shall not be greater than the coaxiality and parallelism requirements recommended by the coupling manufacturer between the pump and motor.

(3) When installing the right angle support, the center of the support opening of the pump support is higher, which is allowed to be slightly higher than the center of the motor by 0 ~ 0.8mm. In this way, when adjusting the coaxiality between the pump and the motor, only the bottom surface of the motor can be padded up. It is allowed to pad metal gaskets not specified in the drawing between the contact surface of the motor and the base (the number of gaskets shall not exceed 3, and the total thickness shall not exceed 0.8mm). Once adjusted, the motor is generally not removed. If necessary, only remove the pump support, and the pump support shall be positioned with locating pins.

(4) After adjustment, drill and ream the locating pin hole between the pump support and the bottom plate, and then install the elastic coupling of the coupling. Then rotate the coupling by hand. At this time, the motor, pump and coupling shall be able to rotate easily and smoothly without abnormal sound.

(5) The rotation direction of the pump shall be correct. The oil inlet and outlet of pump and hydraulic motor shall not be connected reversely to avoid failure and accident.

(6) The support or bottom plate of pump and hydraulic motor shall have sufficient strength and stiffness to prevent vibration.

(7) The oil suction height of the pump shall not exceed the provisions in the operation manual (generally 500mm), and it shall be installed as close to the oil level of the oil tank as possible.

(8) The oil suction pipe of the pump shall not leak to prevent air from entering the system and generating vibration and noise.

2. Installation of oil cylinder

(1) When installing the oil cylinder, make a special seal protective sleeve, and fill the oil inlet and outlet and air outlet with special materials to ensure that the seal will not be damaged when the piston is installed into the cylinder barrel.

(2) Check whether the piston rod is bent, especially for long stroke cylinders. Bending of the piston rod will damage the cylinder head seal, lead to leakage, crawling and action failure, and aggravate the eccentric wear of the piston rod.

(3) The axis line of the oil cylinder shall be parallel to the guide rail. Pay special attention to the situation when the piston rod is fully extended. If the two are not parallel, large lateral force will be generated, resulting in oil cylinder jamming, poor reversing, crawling, oil cylinder seal damage and failure. Generally, the hydraulic cylinder can be adjusted with a dial gauge based on the guide rail. Make the side bus of the piston rod (Extended) parallel to the V-shaped guide rail, and the upper bus parallel to the flat guide rail. The allowable deviation is (0.04 ~ 0.08) mm / m.

(4) The parallelism error between the axial line of the piston rod and the mounting base surface of the supports at both ends shall not be greater than 0.05mm.

(5) For the oil cylinder with a long stroke, the connection between the piston rod and the worktable shall remain floating (connected with the spherical pair) to compensate for the jamming and thermal expansion caused by the installation error.

2. Installation of manifold block

(l) All oil flow channels of the valve block, especially the intersection of holes, must be carefully deburred, and the probe lamp must be extended into the hole for careful removal and inspection. The outer circumference and edges of the valve block must be chamfered and deburred. The surface where the processed valve block fits with the hydraulic valve, pipe joint and flange shall not leave scars or scribed marks.

(2) After the valve block is processed, it must be repeatedly pressurized and cleaned with antirust cleaning fluid. Special attention shall be paid to cleaning the flow channels of all holes, especially the blind holes. The cleaning tank shall be divided into rough cleaning and fine cleaning. If the cleaned valve block is not assembled temporarily, all orifices shall be covered immediately and sealed on the orifice with large adhesive tape.

(3) When installing hydraulic valves on the valve block, check their models and specifications. Each valve must have a product certificate and confirm that its cleanliness is qualified.

(4) Check the specification, model, material and delivery date of all seals (within the service life).

(5) Before assembly, check again whether all holes on the valve block are consistent and correct with the design drawing.

(6) Check whether the material and strength of the connecting bolts meet the design requirements and the requirements specified by the manufacturer of hydraulic parts. The connecting bolts of each hydraulic valve on the valve block must be tightened with a force measuring wrench. The tightening torque shall comply with the regulations of the hydraulic valve manufacturer.

(7) If there is a locating pin, the locating pin must be installed.

(8) Small metal signs shall be nailed on the valve block to indicate the serial number of each hydraulic valve on the design drawing, the name of each circuit and the function of each external interface.

(9) After the valve block is assembled, the pressure test and function test shall be conducted separately for the valve block before it is installed on the valve rack or hydraulic system.

4. Installation of valve components

(1) During installation, clean the antirust agent and other dirt on the surface of the element with clean kerosene or diesel (gasoline is not allowed). At this time, pay attention not to pull out the plastic plug plugged at each oil port to prevent dirt from entering the valve.

(2) For the special valves designed and manufactured by ourselves, performance test, pressure test, etc. shall be carried out according to relevant standards.

(3) During the installation of plate valve components, check whether the sealing ring of each oil port is missing or falling off, whether it protrudes from the installation plane with a certain compression allowance, whether the protrusion of sealing rings of various specifications on the same plane is consistent, whether the groove of each oil port for installing O-ring is damaged, and whether the installation surface is bruised. Assemble after disposal. Apply a little butter to the O-ring to prevent it from falling off.

(4) The mounting screws (mostly 4) of the plate valve shall be tightened diagonally and evenly one by one. Do not tighten a single screw first, which will cause deformation of the valve body and inconsistent compression allowance of the sealing ring on the base plate, resulting in oil leakage and flushing out of the sealing ring.

(5) Valves with symmetrical inlet and outlet are easy to install the inlet and outlet reversely. For pressure valves with similar shape, special attention shall be paid to distinguish them during installation to avoid wrong installation.

(6) For the tubular valve, in order to facilitate installation and use, there are often two oil inlets or two oil return ports. During installation, the unused oil ports shall be blocked with plugs or other treatments to avoid oil injection or failure during operation.

(7) Generally, it should be installed horizontally. When installing vertically, the electromagnet is generally upward (two position valve). This factor should be considered when designing the mounting plate.

(8) The overflow valve (pilot type) has a remote control port. When remote control is not adopted, plug it with screw plug (tubular type) or the mounting plate does not drill through (plate type).

5. Installation of accessories

The installation of auxiliary components in the hydraulic system, including pipelines and pipe joints, oil filters, oil coolers, seals, accumulators and instruments, will also seriously affect the normal operation of the hydraulic system, and no negligence is allowed.

In the design, we should consider the correct position configuration of these auxiliary components. Try to consider the convenience of use, maintenance and adjustment, and pay attention to tidiness and beauty.

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