1) If the cylinder body is inlaid with copper sleeve, it can be repaired by replacing the copper sleeve. First of all, trim the diameter of a set of plunger rods to a uniform size, and then polish the outer diameter with sandpaper of more than 1000#. There are three ways to install copper sleeves in the cylinder block: (a) Heating and hot charging of the cylinder block or low-temperature freezing and extrusion of the copper sleeve, interference assembly; (b) Adopt Loctite adhesive assembly, which requires a groove on the outer diameter surface of the copper jacket; (c) Cylinder bore tapping, copper sleeve outer diameter processing thread, coated with Loctite glue, screwed into assembly.
2) The repair method of the cylinder block and copper sleeve of the melting combination method is as follows: (a) Grinding rod is used to repair the cylinder bore by manual or mechanical grinding; (b) Adopt a coordinate boring machine to re-boring the cylinder bore; (c) Use a reamer to repair the cylinder bore.
3) Adopt "surface engineering technology" as follows: (a) Electroplating technology: plating a layer of hard chrome on the surface of the plunger; (b) Brush plating technology: brush and plating wear-resistant materials on the surface of the plunger; (c) Thermal spraying or arc spraying or electric spraying: spraying high-carbon martensitic wear-resistant materials; (d) Laser deposition: high hardness and wear-resistant alloy powder is deposited on the surface of the plunger.
4) Most of the cylinder materials without copper sleeves are ductile iron, and amorphous films or coatings are prepared on the cylinder wall. Because the inner wall of the cylinder bore has this special substance, it can form a hard-hard matching friction pair. If you blindly grind the cylinder bore and grind off the surface material of the inner wall of the cylinder bore, the friction and structural performance will be changed. If the friction pair with the coating removed is forcibly used, the temperature of the friction surface will rise sharply, and the plunger rod will be glued to the cylinder bore.
In addition, a unique thin film coating is prepared on the surface of the plunger rod, the coating contains the function of anti-wear + wear-resistant + lubrication, this group of friction pairs is actually hard-soft pairing, once the coating is changed manually, it will also destroy the friction pair of the best matching material, repair these special piston pumps, it is necessary to send to a professional repair shop.
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Worry-free, flexible and easy to use (Image source: Bosch Rexroth China)
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How Rexroth hydraulic pumps are adjusted
1) Swash plate axial piston variable pump for open hydraulic rotation circuit
2) Mainly used in the field of mobile machinery
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4) The output flow rate is proportional to the driving speed, ...
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Common problems and solutions of Rexroth hydraulic pumps
1. The pump does not absorb oil, the flow rate is not enough, the pump is empty, and the pump is damaged.
Damaged pumps, damaged skates or damaged ski and column ball joint seals; swash plate wear; wear of plungers and cylinder bores; failure of variable mechanisms; Wear of the oil distribution pan or wear of the oil distribution end face of the cylinder block; The LS valve of the pump is worn, the pressure is cut off...
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Exclusion method: Add hydraulic oil.
2. Cause of failure: Hydraulic oil is not used according to the season;
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Test method for linear proportional control of numerical control pressure of Rexroth proportional valves
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Single piston pump
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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
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(1) The oil has a certain compressibility, resulting in noise, vibration and crawling of moving parts in the system.
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1. Hydraulic pump:
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The purpose of using Rexroth proportional valves or servo valves
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Rexroth inverter common faults and solutions
Power outage handling
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External fault handling
If you enter ...
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