German Krautzberger pump Krautzberger model Krautzberger price

Krautzberger 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.

Krautzberger pump classification

__Piston__ __pump__s are generally classified into single-__Piston__ __pump__s, horizontal __Piston__ __pump__s, axial __Piston__ __pump__s, and radial __Piston__ __pump__s. 1) Single-__Piston__ __pump__: The main structural components are an eccentric wheel, __Piston__, spring, cylinder block, and two check valves. A sealed volume is formed between the __Piston__ and the cylinder block bore. One rotation of the eccentric wheel causes the __Piston__ to reciprocate once; downward motion draws in oil, and upward motion discharges oil. The volume of oil discharged per revolution of the __pump__ is called the displacement, which depends only on the structural parameters of the __pump__. 2) Horizontal __Piston__ __pump__: A horizontal __Piston__ __pump__ consists of several __Piston__s (generally 3 or 6) installed in parallel. It uses 1 crankshaft(s) to drive the __Piston__s in reciprocating motion via connecting rod sliders or directly via an eccentric shaft, achieving suction and discharge of liquid as a hydraulic __pump__. They all adopt valve-type distribution devices, and most are fixed-displacement __pump__s. Emulsion __pump__s in coal mine hydraulic support systems are generally horizontal __Piston__ __pump__s. Emulsion __pump__s are used at coal mining faces to provide emulsion for hydraulic supports. Their working principle relies on the rotation of the crankshaft to drive the __Piston__ in reciprocating motion, achieving liquid suction and discharge. 3) Axial type: An axial __Piston__ __pump__ (English name: Piston pump) is a __Piston__ __pump__ in which the reciprocating motion direction of the __Piston__ or plunger is parallel to the central axis of the cylinder block. Axial __Piston__ __pump__s operate by utilizing the volume change produced by the reciprocating motion of __Piston__s parallel to the drive shaft within the __Piston__ bores. Since both the __Piston__s and __Piston__ bores are circular components, they can achieve high-precision mating, resulting in high volumetric efficiency. 4) Straight-axis swashplate type: Straight-axis swashplate __Piston__ __pump__s are divided into pressure-supply type and self-priming type. Pressure-supply type hydraulic __pump__s mostly use pressurized tanks. For hydraulic tanks relying on air pressure for supply, the machine must only be operated after the hydraulic tank reaches the required operating air pressure following each startup. If the machine is started when the air pressure in the hydraulic tank is insufficient, it will cause detachment of the slipper shoes inside the hydraulic __pump__, leading to abnormal wear between the return plate and the pressure plate within the __pump__ body. 5) Radial type: Radial __Piston__ __pump__s can be divided into two categories: valve distribution and shaft distribution. Valve-distribution radial __Piston__ __pump__s have disadvantages such as high failure rates and low efficiency. Internationally, shaft-distribution radial __Piston__ __pump__s developed in the 70s and 80s overcame the shortcomings of valve-distribution radial __Piston__ __pump__s. Due to the structural characteristics of radial __pump__s, shaft-distribution radial __Piston__ __pump__s are more impact-resistant, have longer service lives, and offer higher control precision than axial __Piston__ __pump__s. For pumps with short variable strokes, displacement variation is achieved by changing the eccentricity of the stator under the action of the variable __Piston__ and limit __Piston__. The maximum eccentricity of the stator is 5–9mm (depending on the displacement size), resulting in a very short variable stroke. Furthermore, the variable mechanism is designed for high-pressure operation and controlled by a control valve, giving the __pump__ a fast response speed. The radial structural design overcomes problems such as uneven wear of slipper shoes in axial __Piston__ __pump__s, significantly improving its impact resistance. 6) Hydraulic type: For hydraulic __Piston__ __pump__s relying on air-pressurized hydraulic tanks, the machine must only be operated after the hydraulic tank reaches the required operating air pressure following each startup. Straight-axis swashplate __Piston__ __pump__s are divided into pressure-supply type and self-priming type. Pressure-supply type hydraulic __pump__s mostly use pressurized tanks, while some hydraulic __pump__s themselves are equipped with a booster sub-__pump__ to supply pressure oil to the inlet port of the hydraulic __pump__. Self-priming type hydraulic __pump__s have strong self-priming capability and do not require external oil supply.

Krautzberger pump structural forms

Piston pumps are divided into two representative structural forms: axial piston pumps and radial piston pumps. As radial piston pumps are a new type of high-efficiency pump with high technological content, with the acceleration of localization, radial piston pumps will inevitably become an important part of the piston pump application field. Radial piston pumps are piston pumps where the reciprocating motion direction of the piston or plunger is perpendicular to the drive shaft. Working principle of radial piston pump: Drive torque is transmitted from the drive shaft through a cross coupling to the star-shaped hydraulic cylinder rotor. The stator is not subjected to other lateral forces. The rotor is mounted on the distribution shaft. Radially arranged pistons located in the rotor press against the eccentric stroke stator via hydrostatically balanced slipper shoes. The piston is connected to the slipper shoe via a ball joint and locked with a retaining ring. Two retaining rings hold the slipper shoes against the stroke stator. When the pump rotates, it presses against the inner surface of the stator relying on centrifugal force and hydraulic pressure. As the rotor turns, due to the eccentricity of the stator, the pistons reciprocate, with their stroke being 2 times the stator eccentricity. The stator eccentricity can be adjusted by two pistons positioned radially opposite each other on the pump body. Oil inlet and outlet occur through channels in the pump body and distribution shaft, controlled by the suction port on the distribution shaft. Hydraulic pressure generated within the pump body is absorbed by the hydrostatically balanced surfaces. The hydrostatic balance of the friction pair adopts an over-balance pressure compensation method, forming open-loop control. The bearings supporting the drive shaft only serve a supporting role and are not subjected to other external forces. In hydraulic systems: Axial piston pumps operate based on the volume change produced by the reciprocating motion of pistons parallel to the drive shaft within piston bores. Since the pistons and piston bores of piston pumps are circular parts, high-precision fits can be achieved during machining.

Krautzberger pump maintenance

(1) Check the piston for scratches and corrosion; replace with new parts if necessary. (2) Check the fit of the piston assembly. Insert the piston end into the piston sleeve and tilt it approximately 60°. If the piston slides down slowly under its own weight, the fit is good. (3) Check the sealing of the piston assembly. Hold the piston sleeve with one hand, blocking the oil inlet at the top and side of the piston with two fingers. Pull out the piston with the other hand; if significant suction is felt and the piston immediately retracts to its original position upon release, the piston assembly sealing is good; otherwise, replace the piston assembly. (4) Check the decompression band of the delivery valve assembly for wear, steps, or scratches; replace if necessary. (5) Check the fit of the delivery valve assembly. 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 assembly sealing is good; otherwise, replace the delivery valve assembly. (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 piston 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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