German allied pump allied model allied price

allied pumps are an important component in hydraulic systems. They rely on the reciprocating motion of plungers within the cylinder block to change the volume of the sealed working chamber, thereby achieving oil suction and discharge. Plunger pumps offer 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 rates, and flow adjustment, such as hydraulic presses, construction machinery, and ships.

allied pump configurations

Plunger pumps are divided into two representative structural types: 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 accelerating pace 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 in which the reciprocating motion direction of the piston or plunger is perpendicular to the drive shaft. Working principle of radial plunger pumps: Drive torque is transmitted from the drive shaft via 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 plungers located in the rotor press tightly against the eccentric stroke stator through hydrostatically balanced slippers. The plunger is connected to the slipper via a ball joint and locked with 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 turns, due to the eccentricity of the stator, the plunger performs reciprocating motion, with its stroke being 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; 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 serve only a supporting role 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 bores. Since both the plunger and the plunger bore are circular components, they can achieve very high precision fits during machining.

allied 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 include 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; 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: Horizontal plunger pumps consist of several plungers (generally 3 or 6) installed in parallel, using 1 crankshaft(s) to directly push the plungers into reciprocating motion via connecting rod sliders or an eccentric shaft, achieving a hydraulic pump for liquid suction and discharge. They all adopt valve-type distribution devices and are mostly 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 pump into reciprocating motion, achieving liquid suction and discharge. 3) Axial type: Axial plunger pumps (English name: Piston pump) are plunger pumps in which 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 bores. Since both the plunger and the plunger bore are circular components, they can achieve very high precision fits, 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 hydraulic pumps 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 pressure following each startup. If the machine is started when the hydraulic tank pressure 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 within the pump body. 5) Radial type: Radial plunger pumps can be divided into two major 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 lives, and offer higher control precision than axial plunger pumps. For pumps with short variable strokes, variation is achieved by changing the stator eccentricity under the action of the variable plunger and limit plunger, while the maximum stator eccentricity is 5–9mm (depending on 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, hence the pump has a fast response speed. The radial structural design overcomes problems such as uneven slipper wear found in axial plunger pumps, significantly improving its impact resistance. 6) Hydraulic type: Hydraulic plunger pumps rely on pressurized hydraulic tanks; after each machine startup, operation must wait until the hydraulic tank reaches the required operating pressure. Straight-axis swashplate plunger pumps are divided into pressure-supply type and self-priming type. Pressure-supply hydraulic pumps mostly use pressurized tanks, though some hydraulic pumps have built-in booster sub-pumps to supply pressure oil to the hydraulic pump inlet. Self-priming hydraulic pumps have strong self-priming capabilities and do not require external oil supply.

allied pump maintenance

When using a gear pump, wear on the gear pump is unavoidable, therefore many problems will arise, so it is necessary to learn the most common maintenance technique for gear pumps. This enables accurate diagnosis when problems occur. Routine maintenance techniques are as follows: 1) Maintenance of the working surface: If the wear on the pump cover working surface is relatively small, you can manually eliminate the wear marks by lapping, that is, place a small amount of valve grinding compound on a surface plate or thick glass plate, then place the pump cover on top and lap it, until the wear marks are removed, and the working surface is flat. If the wear depth on the working surface of the pump cover exceeds zero point one millimeter, maintenance should be performed by first turning and then lapping. 2) Maintenance of the drive shaft bushing bore: The repair method for wear on the drive shaft bushing bore in the pump cover is the same as that for wear on the drive shaft bushing bore in the housing. Repair of the pump housing bore: After wear occurs in the pump housing bore, the sleeve insertion method is used for repair, which involves boring out the inner cavity and fitting a cast iron or steel sleeve. After inserting the sleeve, bore the inner cavity to the required dimensions, and grind off the portion of the sleeve protruding from the end face, so that it is flush with the mating surface of the pump housing. 3) Maintenance of the valve seat: Pressure relief valves come in two types: ball valve and plunger valve. After the ball valve seat wears, place a steel ball on the valve seat, then gently tap the steel ball with a metal rod, until the ball valve seats tightly against the valve seat. If the valve seat is severely worn, ream to remove the wear marks, and then use the above method to achieve a tight seal. After the plunger-type valve seat wears, add a small amount of valve grinding compound for lapping, and lap until a tight seal is achieved. The above describes some basic maintenance of components for gear pumps. During application, other different problems may also be encountered. These different problems must be carefully discussed to identify their causes.

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