German jung pump jung model jung price

jung pump is a typical positive displacement hydraulic machine, driven by a prime mover, converting input mechanical energy into pressure energy of the liquid, and then inputting it into the system in the form of pressure and flow. It is the power source of the hydraulic system. Since it can transport liquids under high pressure, it is widely used in various industries in industrial production and daily life, such as water conservancy, construction, and energy. In addition, it is also widely used in shipbuilding, oil extraction, and loaders.

jung pump usage method

For piston pump cylinders with installed copper sleeves, the method of replacing the copper sleeve can be adopted for installation. First, trim the outer diameter of a set of plunger rods to a uniform size, and then polish the outer diameter with sandpaper of 1000# or higher. Three methods for installing copper sleeves in the cylinder block: a) Heating the cylinder block for hot assembly or cryogenic compression of the copper sleeve for interference fit; b) Adhesive assembly using Loctite adhesive; this method requires grooves on the outer diameter surface of the copper sleeve; c) Tapping the cylinder bore, machining threads on the outer diameter of the copper sleeve, applying Loctite adhesive, and screwing it in for assembly. Installation methods for cylinder blocks and copper sleeves combined by sintering are as follows: a) Use a grinding rod to manually or mechanically grind and repair the cylinder bore; b) Use a coordinate boring machine to re-bore the cylinder block hole; c) Use a reamer to repair the cylinder block hole. Methods using "surface engineering technology" are as follows: a) Electroplating technology: Plate a layer of hard chrome on the plunger surface; b) Brush electroplating technology: Brush plate wear-resistant materials on the plunger surface; c) Thermal spraying, arc spraying, or electric spraying: Spray high-carbon martensitic wear-resistant materials; d) Laser cladding: Clad high-hardness wear-resistant alloy powder on the plunger surface. e) For cylinder blocks without copper sleeves in the cylinder bore, the material is mostly ductile iron, preparing an amorphous film or coating on the inner wall of the cylinder block. Because of this special substance on the inner wall of the cylinder bore, a hard-to-hard friction pair can be formed.

jung pump classification

Piston pumps are generally divided into single-piston pumps, horizontal piston pumps, axial piston pumps, and radial piston pumps. 1) Single-piston pump: The structural composition mainly includes an eccentric wheel, plunger, spring, cylinder block, and two check valves. A sealed volume is formed between the plunger and the cylinder bore. One rotation of the eccentric wheel causes the plunger to reciprocate once, sucking oil during downward motion and discharging oil during upward motion. The volume of oil discharged per revolution of the pump is called displacement, which is only related to the structural parameters of the pump. 2) Horizontal piston pump: Horizontal piston pumps consist of several pistons (generally 3 or 6) installed in parallel. A 1 crankshaft drives the pistons to reciprocate via connecting rod sliders or directly via an eccentric shaft, realizing a hydraulic pump for suction and discharge of liquids. They all use valve-type distribution devices, and most are fixed-displacement pumps. Emulsion pumps in coal mine hydraulic support systems are generally horizontal piston pumps. Emulsion pumps are used at coal mining faces to provide emulsion for hydraulic supports. The working principle relies on the rotation of the crankshaft to drive the Piston to reciprocate, realizing liquid suction and discharge. 3) Axial type: Axial Piston pump (English name: Piston pump) are piston pumps where the reciprocating motion direction of the piston or plunger is parallel to the central axis of the cylinder block. Axial piston pumps operate by utilizing the volume change generated by the reciprocating motion of plungers parallel to the drive shaft within the plunger bores. Since both the plunger and the plunger bore are circular parts, they can achieve very high precision fits, resulting in high volumetric efficiency. 4) Straight-axis swashplate type: Straight-axis swashplate piston pumps are divided into pressure-supply type and self-priming type. Pressure-supply hydraulic pumps mostly use pressurized tanks. For hydraulic tanks supplied by air pressure, after each machine start-up, one must wait until the hydraulic tank reaches the operating air pressure before operating the machinery. If the machine is started when the air pressure in the hydraulic tank is insufficient, it will cause the slipper shoes inside the hydraulic pump to pull off, causing abnormal wear between the return plate and the pressure plate in the pump body. 5) Radial type: Radial piston pumps can be divided into two categories: valve distribution and shaft distribution. Valve-distribution radial piston pumps have disadvantages such as high failure rates and low efficiency. Shaft-distribution radial piston pumps developed in the 70s and 80s internationally overcame the shortcomings of valve-distribution radial piston pumps. Due to the structural characteristics of radial pumps, shaft-distribution radial piston pumps are more impact-resistant, have longer service lives, and offer higher control precision than axial piston pumps. The variable displacement of short-stroke variable pumps is achieved by changing the eccentricity of the stator under the action of the variable plunger and limit plunger, and the maximum eccentricity of the stator is 5—9mm (depending on the displacement size), with a very short variable stroke. Moreover, the variable mechanism is designed for high-pressure operation and controlled by a control valve. Therefore, the pump has a fast response speed. The radial structural design overcomes problems such as uneven wear of slipper shoes in axial piston pumps, significantly improving its impact resistance. 6) Hydraulic type: Hydraulic piston pumps rely on pressurized hydraulic tanks. After each machine start-up, one must wait until the hydraulic tank reaches the operating air pressure before operating the machinery. Straight-axis swashplate piston pumps are divided into pressure-supply type and self-priming type. Pressure-supply hydraulic pumps mostly use pressurized tanks, and some hydraulic pumps themselves have a boost pump to provide pressure oil to the inlet of the hydraulic pump. Self-priming hydraulic pumps have strong self-priming capabilities and do not require external oil supply.

jung pump maintenance

(1) Check the plunger for scratches and corrosion; replace with new parts if necessary. (2) Check the fit of the plunger pair. Insert the end of the plunger into the plunger sleeve and tilt it approximately 60°. If the plunger slides down slowly under its own weight, the fit is good. (3) Check the sealing of the plunger pair. Hold the plunger sleeve with one hand, blocking the oil inlet at the top and side of the plunger with two fingers. Pull out the plunger with the other hand; if significant suction is felt and the plunger immediately retracts to its original position upon release, the plunger pair sealing is good; otherwise, replace the plunger pair. (4) Check the decompression band of the delivery valve pair for wear, steps, or scratches; replace if necessary. (5) Check the fit of the delivery valve pair. Block the lower hole of the delivery valve with one finger and gently press the delivery valve downward with another finger. When the finger leaves the top of the delivery valve, if it automatically springs back to its original position, the delivery valve pair sealing is good; otherwise, replace the delivery valve pair. (6) Check the tappet body. The standard clearance between the injection pump body and the tappet body is 0～0.03mm; if it exceeds 0.2mm, replace the parts. (7) Check the clearance between the plunger flange and the groove of the control sleeve, which should be 0.02～0.08mm; if it exceeds 0.12mm, the control sleeve must be replaced.

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