German DOSATRON pump DOSATRON model DOSATRON price

DOSATRON pump is an important device in hydraulic systems. It relies on the reciprocating motion of the plunger in the cylinder block to change the volume of the sealed working chamber, thereby achieving oil suction and pressure discharge. Plunger pumps have advantages such as high rated pressure, compact structure, high efficiency, and convenient flow regulation. Plunger pumps are widely used in applications requiring high pressure, large flow, and flow regulation, such as hydraulic presses, construction machinery, and ships.

DOSATRON pump structural form

Plunger pumps are divided into two representative structural forms: axial plunger pumps and radial plunger pumps. Since radial plunger pumps are a new type of high-efficiency pump with high technical content, with the acceleration of localization, radial plunger pumps will inevitably become an important part of the plunger pump application field. A radial plunger pump is a plunger pump where the reciprocating motion direction of the piston or plunger is perpendicular to the drive shaft. Radial plunger pump working principle: Drive torque is transmitted from the drive shaft through a cross coupling to the star-shaped hydraulic cylinder rotor, and the stator is not subject to other lateral forces. The rotor is mounted on the distribution shaft. The radially arranged plungers located in the rotor press tightly against the eccentric stroke stator via hydrostatically balanced slippers. The plunger is connected to the slipper by a ball joint and locked by a retaining ring. Two retaining rings hold the slippers 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 rotates, due to the eccentricity of the stator, the plunger performs reciprocating motion, and its stroke is 2 times the stator eccentricity. The stator eccentricity can be adjusted by two plungers 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. The hydraulic pressure generated in the pump body is absorbed by the hydrostatically balanced surface. 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 provide support and are not subject to other external forces. In hydraulic systems: Axial plunger pumps operate by utilizing the volume change produced by the reciprocating motion of plungers parallel to the transmission shaft within the plunger holes. Since both the plunger and the plunger hole are circular parts, they can achieve very high precision fit during machining.

DOSATRON pump classification

Plunger pumps are generally classified into single plunger pumps, horizontal plunger pumps, axial plunger pumps, and radial plunger pumps. 1) Single plunger pump: The main structural components are an eccentric wheel, plunger, spring, cylinder block, and two check valves. A sealed volume is formed between the plunger and the cylinder block hole. One rotation of the eccentric wheel causes the plunger to reciprocate once; downward motion sucks oil, and upward motion discharges oil. The volume of oil discharged per revolution of the pump is called displacement, which depends only on the pump's structural parameters. 2) Horizontal plunger pump: A horizontal plunger pump consists of several plungers (generally 3 or 6) installed in parallel. One 1 crankshaft drives the plungers to perform reciprocating motion via connecting rod sliders or directly through an eccentric shaft, realizing a hydraulic pump for suction and discharge of liquids. They all adopt valve-type distribution devices, and most are fixed-displacement pumps. Emulsion pumps in coal mine hydraulic support systems are generally horizontal plunger pumps. Emulsion pumps 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: Axial plunger pump (English name: Piston pump) is a plunger pump where the reciprocating motion direction of the piston or plunger is parallel to the center axis of the cylinder block. Axial plunger pumps operate by utilizing the volume change produced by the reciprocating motion of plungers parallel to the transmission shaft within the plunger holes. Since both the plunger and the plunger hole are circular parts, they can achieve very high precision fit, resulting in high volumetric efficiency. 4) Straight-axis swashplate type: Straight-axis swashplate plunger pumps are divided into pressure-supply type and self-priming type. Pressure-supply type hydraulic pumps mostly use pressurized tanks. For hydraulic tanks relying on air pressure for supply, after each machine start-up, operation can only begin once the hydraulic tank reaches the required operating air pressure. If the machine is started when the air pressure in the hydraulic tank is insufficient, it will cause detachment of the slippers inside the hydraulic pump, leading to abnormal wear between the return plate and the pressure plate in the pump body. 5) Radial type: Radial plunger pumps can be divided into two categories: valve distribution and shaft distribution. Valve-distribution radial plunger pumps have disadvantages such as high failure rates and low efficiency. Shaft-distribution radial plunger pumps developed internationally in the 70s and 80s overcame the shortcomings of valve-distribution radial plunger pumps. Due to the structural characteristics of radial pumps, shaft-distribution radial plunger pumps are more impact-resistant, have longer service life, and higher control precision than axial plunger pumps. For pumps with short variable strokes, displacement variation is achieved by changing the stator eccentricity under the action of the variable plunger and limit plunger. The maximum stator eccentricity is 5—9mm (depending on displacement size), and the variable stroke is very short. Moreover, the variable mechanism is designed for high-pressure operation and controlled by a control valve, resulting in fast response speed. The radial structural design overcomes problems such as uneven slipper wear found in axial plunger pumps, significantly improving impact resistance. 6) Hydraulic type: Hydraulic plunger pumps rely on pressurized tanks for oil supply. After each machine start-up, operation can only begin once the hydraulic tank reaches the required operating air pressure. Straight-axis swashplate plunger pumps are divided into pressure-supply type and self-priming type. Pressure-supply type hydraulic pumps mostly use pressurized tanks, while some hydraulic pumps have a built-in boost pump to provide pressure oil to the hydraulic pump inlet. Self-priming hydraulic pumps have strong self-priming capability and do not require external oil supply.

DOSATRON pump application fields

Chemical industry; Mining and metallurgy industry; Paper industry; Paint and coating industry; Food industry; Ceramic industry; Petroleum industry; Water treatment industry; Pharmaceutical industry; Medical device industry. Pharmaceutical industry application: Peristaltic pumps are mainly used in the pharmaceutical industry for drug coating, granulation, and pharmaceutical packaging. Spray drying granulators, also known as drying granulators and fluidized bed granulators, are machines used to spray special sugar coatings onto the surface of various instant granular materials, forming granules after drying. These granulators have their own drying heat source, which can evaporate moisture. However, since moisture evaporation and granule formation are dynamic processes, the amount of injected liquid and water must be very precise to ensure a certain humidity level for the granules, facilitating perfect granule formation.

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