German bielomatik pump bielomatik model bielomatik price

bielomatik pump is an important device in hydraulic systems. It relies on the reciprocating motion of the plunger in the cylinder body 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.

bielomatik pump mechanical principle

The total stroke L of the plunger's reciprocating motion is constant and determined by the cam lift. The fuel supply volume per plunger cycle depends on the supply stroke; the supply stroke is variable and not controlled by the camshaft. The start of fuel supply does not change with variations in the supply stroke. Rotating the plunger changes the end of fuel supply timing, thereby changing the fuel supply volume. During operation, under the action of the cam on the injection pump camshaft and the plunger spring, the plunger is forced to move up and down reciprocally, completing the pumping task. The pumping process can be divided into the following two stages. 1) Oil intake process: After the cam lobe rotates past, under the force of the spring, the plunger moves downward, creating a vacuum in the upper space of the plunger (called the pump chamber). When the upper end face of the plunger opens the inlet hole on the plunger sleeve, diesel fuel filling the oil passage in the upper body of the oil pump enters the pump chamber through the oil hole. The plunger moves to the bottom dead center, and the oil intake ends. 2) Return oil process: The plunger supplies oil upward. When it moves up to the point where the helical groove (cut-off edge) on the plunger communicates with the return oil hole on the sleeve, the low-pressure oil circuit in the pump chamber connects with the central hole, radial hole, and helical groove at the plunger head. The oil pressure drops suddenly, and the delivery valve closes rapidly under the force of the spring, stopping oil supply. The plunger continues to move upward. After the cam lobe rotates past, the plunger moves downward again under the action of the spring. This begins the next cycle. The plunger pump is described using a single plunger as an example. A plunger pump has two check valves with opposite directions. When the plunger moves in one direction, negative pressure appears in the cylinder, opening one check valve and sucking liquid into the cylinder. When the plunger moves in the other direction, the liquid is compressed, opening the other check valve, and the liquid sucked into the cylinder is discharged. This continuous operation forms continuous oil supply.

bielomatik 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 body, 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, moving down to suck oil and up to discharge oil. The volume of oil discharged per pump revolution 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. A 1 crankshaft drives the plungers to reciprocate via connecting rod sliders or directly via an eccentric shaft, achieving hydraulic pumping for suction and discharge of liquids. They all use 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 in reciprocating motion, achieving liquid suction and discharge. 3) Axial type: Axial Piston pump (English name: Piston pump) are plunger pumps where the reciprocating motion direction of the piston or plunger is parallel to the central axis of the cylinder body. Axial plunger pumps operate by utilizing the volume change generated by the reciprocating motion of plungers parallel to the drive shaft within plunger bores. Since both the plunger and plunger bore are circular parts, they can achieve high-precision mating, 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 oil tanks. For hydraulic tanks relying on air pressure for oil supply, the machine must only be operated after the hydraulic oil tank reaches the required operating pressure. If the machine is started when the air pressure in the hydraulic oil 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 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 offer higher control precision than axial plunger pumps. For pumps with short variable strokes, displacement variation is achieved by changing the eccentricity of the stator under the action of the variable plunger and limit plunger. The maximum eccentricity of the stator 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 design overcomes problems such as uneven slipper shoe wear found in axial plunger pumps, significantly improving impact resistance. 6) Hydraulic type: Hydraulic plunger pumps rely on pressurized oil tanks for oil supply. After each machine start-up, operation must wait until the hydraulic oil 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 oil tanks, though some hydraulic pumps have built-in boost sub-pumps 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.

bielomatik pump mechanical maintenance

For plunger pumps using a boost pump for oil supply, after 3000h of use, operators must inspect the plunger pump 1-2 times daily to check whether the hydraulic pump operating noise is normal. If a decrease in hydraulic cylinder speed or stalling is observed, the boost pump should be disassembled for inspection to check for scoring on the impeller edges and whether the internal gear pump clearance is excessive. For self-priming plunger pumps, the oil level in the hydraulic tank must not fall below the lower limit of the oil gauge; sufficient hydraulic oil must be maintained. The higher the cleanliness of the hydraulic oil, the longer the service life of the hydraulic pump. The most important component of a plunger pump is the bearing. If bearing clearance occurs, the normal clearance of the three friction pairs inside the hydraulic pump cannot be guaranteed, and the thickness of the static hydrostatic support oil film of each friction pair will be compromised, reducing the service life of the plunger pump bearings. According to data provided by hydraulic pump manufacturers, the average service life of bearings is 10000h; exceeding this value requires replacement with new ones. Removed bearings cannot be tested for clearance without professional detection instruments; only visual inspection is possible. If scratches or discoloration are found on the roller surface, they must be replaced. When replacing bearings, note the original bearing's English letters and model number. Plunger pump bearings mostly use high-load-capacity bearings. Purchase products from the original manufacturer with original specifications. If switching to another brand, consult personnel experienced with bearings to check tables for equivalents, aiming to maintain the bearing's precision grade and load capacity. The service life of a plunger pump depends on routine maintenance, the quantity and quality of hydraulic oil, and oil cleanliness. Avoiding wear on the plunger pump's friction pairs caused by particles in the oil is also an effective way to extend plunger pump life. During maintenance, try to use original manufacturer-produced parts for replacement. These parts may sometimes be more expensive than other counterfeit parts, but their quality and stability are better. Purchasing cheap counterfeit parts may seem to save costs in the short term, but it brings hidden dangers and may cause greater harm to the use of the plunger pump. Distribution plates come in two forms: flat distribution and spherical distribution. For spherical distribution friction pairs, if scratches on the cylinder body distribution surface are shallow, they can be repaired by grinding. If grooves on the cylinder body distribution surface are deep, "surface engineering technology" should first be used to fill the grooves before grinding. Blind grinding should be avoided to prevent thinning of the copper layer or exposing the steel base, which could cause oil leakage. Plunger pumps can also use frequency converters to save energy. Engineers from Shanghai Zhengyi point out that in actual production processes, plunger pumps usually regulate their working state by pressure or flow. When the actual pressure exceeds the required pressure, the relief valve regulates it to keep the working pressure stable by releasing the excess. However, the motor always runs at full speed with repeated actions, and power consumption remains unchanged. When using overflow to regulate pressure and flow, some excess flows back to the original system, resulting in useless power in the plunger pump and low work efficiency. If a Chuangjie energy-saving frequency converter is used, the relief valve can be set to close, and the energy-saving frequency converter automatically adjusts the working pressure to maintain stability and automatically track the equipment pressure. This achieves automated control, thereby saving energy consumption. The greatest advantage of this regulation method is that it can reduce the operating energy consumption of the plunger pump, with power savings reaching over 30%.

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