Neilson Hydraulics & Engineering Ltd

IMO Slewing Rings are used in numerous applications as machine elements that can simultaneously transmit axial and radial forces, as well as tilting moments. The application spectrum ranges from large triple-row roller slewing rings for tunnel construction to small ball slewing rings for medical technology. However, IMO Slewing Rings are used in the bottling and filling industry, opencast mining, bulk handling, and transport engineering. In the field of renewable energies, IMO blade bearings, yaw bearings, and main bearings are used in wind turbines or as rotor blade bearings in tidal stream systems.

 

 

 

 

Other examples of applications for IMO Slewing Rings in the industrial sector are:

 

·       Drilling

·       Factory Automation and Intralogistics

·       Marine Cranes

·       Public Transportation

·       Ship Deck Equipment

·       Tunnel Boring

·       And many more applications…

 

Please also read, IMO Slewing Ring for Cranes and Slewing Rings for Construction

 

But what is a Slewing Ring?

Slewing Rings are large diameter antifriction bearings for the simultaneous transmission of axial and radial forces as well as tilting moments. They replace traditional solutions with fixed and floating bearings as well as king pin bearings. Frequently, this results in bearings with axial/radial bearing combinations with one bearing point. This can significantly simplify the design of the mounting structure and the installation of the bearings, which in turn reduces effort and costs.

 

Cost-effective and tried-and-tested, IMO antifriction bearings are available as:

 

• Ball slewing rings, roller slewing rings, and ball-roller combination slewing rings.
• Four-point bearings, double four-point bearings/eight-point bearings, flange bearings, wire race bearings, cross roller bearings.
• Segmented slewing rings.
• Gear rims.
• External gearing, internal gearing, or without gearing.
• Diameter ranging from 100 mm to 6000 mm.
• With cages (steel, brass, or plastic) or spacers (brass or plastic).
• With standard seals or specially produced special seals.
• Optionally with induction-hardened raceways.
• Different corrosion protection coatings possible.

 

IMO Slewing Rings have mounting holes and a sealed raceway system with grease lubrication. They can be combined with motors, pinions, and planetary gears. Functions and parts of the mounting structure – such as attached bearing rings – can be integrated.

 

WE ARE AN IMO DISTRIBUTOR

Neilson Hydraulics is an IMO UK distributor. Neilson Hydraulics supplies IMO Slew Drives, including IMO Slew Drives WD Series (WD-L & WD-H) and IMO Slew Drives SP Series (SP-I & SP-H), as well as IMO Slewing Rings, including IMO Ball Slewing Rings, IMO Roller Slewing Rings and IMO Ball-roller Combination Slewing Rings.

 

To enquire about IMO Slew Drives and IMO Slewing Rings, please contact Neilson Hydraulics on: 01709 821 002 / E: sales@neilson-hydraulics.co.uk or visit our website at:  https://www.neilson-hydraulics.co.uk/imo-slewing-rings.html

 

 

What are hydraulic filters? A hydraulic filter is a component used by hydraulic systems to continuously remove contaminants in the hydraulic oil. This process will purify the hydraulic fluid and protect the system from damage created by the particle contents. Hydraulic filters are a crucial element of any system using hydraulic power and are designed to filter oil, water or other liquids, within a hydraulic installation application. Hydraulic systems have an increased risk of contamination due to wear of components, ingression from seals or low-quality liquid. Therefore no fluid power system should be complete without the use of a filter. Hydraulic filters help to keep the hydraulic fluid contaminant free.

 

Why are hydraulic filters used in hydraulic systems?

 

Hydraulic filters are used anywhere in a hydraulic system where particle contamination is to be removed. Particle contamination can be ingested through the reservoir, created during the manufacture of system components, or generated internally from the hydraulic components themselves (especially pumps and motors).

 

Hydraulic filters are mainly used in a variety of hydraulic systems in the industry. These filters have many advantages that ensure the safe working of a hydraulic system. Some of those advantages of hydraulic oil filters are listed below:

 

• Eliminate the presence of foreign particles in hydraulic fluid.
• Protect the hydraulic system from the dangers of particle contaminants.
• Improves the overall efficiency and productivity.
• Compatible with most of the hydraulic system.
• Low cost for maintenance.
• Improves the service life of hydraulic system.

 

 

What are the types of hydraulic filters?

 

There are several types of hydraulic filters, and they are often classified by where they are designed to be placed in the hydraulic system. The most common hydraulic filter types are:

 

In-Line Filters – Placed directly on the fluid line, may be suction side (before the pump) or pressure side (after the pump but before the valves and cylinders), inlet, outlet, and media are aligned

 

Off-Line – Consists of a separate pump and filter linked directly to the reservoir, often used to supplement main system filters

 

Tank – May be positioned on or within the fluid reservoir, may have an accessible head on the tank exterior for easy access and media replacement

 

Spin-On – Consists of an in-line head screwed onto. Threaded canister, easy to install and economical

 

Return Line – Filter is placed directly on return line, can also be spin-on, in-line, or tank mounted

 

Duplex – Actually a valve/filter assembly permitting flow to 2 separate filters in order to maintain flow during filter maintenance.

 

At Neilson Hydraulics and as a hydraulic group with VHS Hydraulic Components, we stock a variety of hydraulic filters from brands including, Bosch Rexroth, Eaton and Ikron. To speak to our technical sales department please call: 01709 821 002 or email: sales@neilson-hydraulics.co.uk.

 

 

A Hydraulic Power Unit or HPU for short, in basic terminology, is a self-contained unit that consists primarily of a prime mover (either an engine or electric motor) a hydraulic pump, a valve and a hydraulic tank reservoir.

 

By utilising fluid to transmit power from one location to another, hydraulic power units can generate large amounts of power, which in turn can be used to drive hydraulic machinery.

Another way to think of a hydraulic power pack is that it is a portable power delivery system that holds energy for a hydraulic mechanism. A good analogy to think what a hydraulic power pack is, is to consider the role of an electric battery, which stores energy for a circuit to draw on when is required. HPU’s are used in a wide range of industrial applications and machines, especially where there is no direct access to a power source.

How is hydraulic power unit required power calculated?

Hydraulic power is defined as flow multiplied by pressure. The hydraulic power supplied by a pump is: Power = (P x Q) ÷ 600 – where power is in kilowatts [kW], P is the pressure in bars, and Q is the flow in litres per minute. ** based upon 100% efficiency; 90% efficiency would equate to 75 ÷ 0.9 = 83.3kW.

 

Hydraulic Power Unit Manufactures

At Neilson Hydraulics we have been designing, building, installing, and commissioning hydraulic power units for over 30 years. We manufacture custom-made hydraulic power units that can be built strictly in accordance with the client’s specifications. We can provide a complete hydraulic solution from ‘concept to completion’. As a HPU manufacturer, we can provide repeat hydraulic power units, as we well as hydraulic power units for specialist projects. Utilising our string technical abilities in 3D modelling, CAD, SolidWorks, system controls and hydraulic circuit design.

 

We have used our expertise and knowledge for projects spanning numerous sectors, including, recycling, oil, gas, marine, agricultural and construction to name a few.

 

Example of Hydraulic Power Units we have produced:

 

Medium Pressure Range HPU

 

 

HPU System Features: 

• Max Pressures 280 BAR
• Variable delivery axial piston pump
• Electric motor or diesel driven
• Hydraulic Reservoir & Accessories
• Proportional control valves, solenoid / manual or cetop valves
• Pressure & return filtration
• Electrical control panel

A 44kW Diesel Power Pack, with Danfoss K-frame Pump capable of 200 bar working pressure, and 100 lpm working pressure.

 

 

 

Key features include:

• 300 litre hydraulic tank.
• Load sensing power unit with online hydraulic cooler.
• Full bunded frame, fork truck lifting points, lifting eyes complete with load test certificate.
• Completed with full enclosure, lockable doors and vented panels.

 

 

At Neilson Hydraulic we can help you with all your hydraulic requirements and needs. To enquire about our Hydraulic Power Units, please call 01709 821002, email: sales@neilson-hydraulics.co.uk or visit: https://www.neilson-hydraulics.co.uk/hydraulic-power-packs.html

 

Neilson Hydraulics is an official UK sales partner for Danfoss Hydraulics (Danfoss Power Solutions, Bosch Rexroth Hydraulics, Moveco Rotary Actuators, IMO Slew Drives and IMO Slewing Rings. We also supply Des-Case Breathers, Eaton Internormen Filters, SPX Power Team. The company also designs and manufactures a range of Hydraulic Power Packs and Hydraulic Power Units.

 

At Neilson Hydraulics we design, manufacture, and repair all hydraulic cylinder types. We offer quick, efficient turnaround on repairs of general hydraulic cylinders, providing a detailed quotation, test certificate and serial number.

 

Throughout the hydraulics industry you will discover a wide variety of hydraulic cylinders. The most common differences between all types of hydraulic cylinders range from the material used to manufacture, the operating pressure and temperature, onto the wall thickness of the tube or end caps but also the methods used for connecting the end caps.

 

The most commonly used types of hydraulic cylinders though are single-acting and double acting cylinders.

 

What is the difference between single-acting and double-acting cylinders?

 

The most noticeable difference between the two is the number of connection ports. For a single acting cylinder, the oil flows into the single port and this is used to extend the plunger. The plunger is retracted then by spring, load, or gravity.

 

For a double acting cylinder, the oil flows into the bottom port and this extends the plunger. The plunger is then retracted by oil flowing into the second port.

 

Benefits of Single-Acting Hydraulic Cylinders

 

• It is of simpler design than the double-acting hydraulic cylinder
• Lower maintenance due to it being manufactured using fewer parts, therefore less problems to potentially arise.
• If control and quick retraction is not required or essential, then the single-acting cylinders are perfect for these tasks
• Requires only 1 hose per cylinder

 

Disadvantages of Single Acting Hydraulic Cylinders

 

• With only one port uses, this means less controlled retraction
• The cylinder can only push in one direction
• The spring can become suspectable to quicker wear and tear.

 

Benefits of Double Acting Hydraulic Cylinders

 

• Due to the connection ports being situated at both ends this allows the piston rod the ability to move forwards and backwards.
• By utilising the extra port, control of the plunger is far greater during retraction, and thus ensuring that it returns to its starting point every time.
• For tasks that requires accuracy and repeatability then these hydraulic cylinders are the choice over single-acting hydraulic cylinders.

 

Disadvantages of Double-Acting Hydraulic Cylinders

 

• They require 2 hoses per cylinder
• Are more complex in design and manufacture
• The cost is greater in comparison due to the greater complexity.
• The hydraulic cylinder will also require a pump with a 4-way valve

 

 

Other Types of Hydraulic Cylinder

 

Tie-Rod Cylinders

 

A large majority of manufacturing and industrial applications use tie-rod cylinders. They use high strength, threaded steel rods and nuts that run the length of the entire cylinder tube, to hold square or rectangular end caps to each end of the cylinder barrel. Seals are placed between the barrel and end cap to prevent leakage. Smaller hydraulic cylinders usually use 4 tie-rods, but larger bore cylinders can use up to 20.

 

A great benefit of Tie-rod cylinders over welded cylinders are that they are less complex than welded body cylinders and can be completely disassembled for service and repair.

 

 

Welded Cylinders

 

Welded cylinders have end flanges welded to the barrel and an end cap attached to each flange. End caps are secured in place by bolts that slip through holes in each end cap and thread into tapped holes in each end flange. Therefore, they are difficult for assembling and disassembling.

 

However, this construction is lighter and more compact than the standard tie-rod configuration. The compact construction therefore does make it more suitable for mobile applications.

 

At Neilson Hydraulics we manufacture and repair hydraulic cylinders.To speak to our technical team to help with your hydraulic requirements, please call 01709 821 002 or email sales@neilson-hydraulics.co.uk.

The Bosch Rexroth AZPF Gear Pump is a fixed displacement external gear pump. It has a gear wheel pair and housing with a front and rear cover.

 

The Bosch Rexroth AZPF Gear Pump is available in a range of sizes across two series:

• Series 1X, standard version pump: 4 | 5 | 8 | 11 | 14 | 16 | 19 | 22 cc/rev
• Series 2X, high performance, Platform F pump: 4 | 5 | 8 | 11 | 14 | 16 | 19 | 22 | 25 | 28 cc/rev

 

 

 

 

 

 

 

 

 

 

 

 

 

 

What is the primary task of an External Gear Pump?

It is the central task of external gear pumps to convert mechanical energy (torque and speed) into hydraulic energy (flow and pressure). To reduce heat losses, Rexroth’s external gear units offer very high efficiencies. They are realized by pressure-dependent gap sealing and highly precise production technology.

 

 

Rexroth external gear pumps are built in four frame sizes:

Platform B, F, N and G. Within each platform different displacements can be realized by different gear widths. The pumps are available in the versions Standard, High-Performance, Silence and Silence Plus. Further configuration variants are given by different flanges, shafts, valve arrangements and multiple pump combinations.

How is the Rexroth Gear Pump Constructed?

The external gear pump consists essentially of a pair of gear wheels supported in bearing bushes and the housing with a front and a rear cover. The drive shaft protrudes from the front cover where it is usually sealed by the shaft seal ring. The bearing forces are absorbed by slide bearings. These are designed for high pressures and have excellent dry-running qualities, especially at low rotational speeds. The gear wheels have 12 teeth. This keeps both flow pulsation and noise emission to a minimum.

 

The internal sealing of the pressure chambers is achieved by operating pressure-dependent forces. This ensures optimum efficiency. On the outer face, the movable bearing bushes are pressurized with operating pressure and pressed as seals against the gear wheels. Special seals form the boundary of the pressuried zone. The radial sealing at the tips of the gear teeth against the case is provided by smallest possible gaps that are formed pressure-dependent between the gear wheels and the housing.

 

Pumping principle

Due to the teeth moving apart during the rotation from the tooth mesh, the gear chambers become clear. The resulting negative pressure as well as the atmospheric pressure on the hydraulic fluid level in the reservoir cause hydraulic fluid to flow from the reservoir to the pump. This hydraulic fluid fills the gear chambers and is transported in them in the direction of the arrow (see sectional drawing) along the housing from the suction side to the pressure side. The teeth mesh again then, force the hydraulic fluid out of the gear chambers and prevent it from flowing back to the suction chamber.

 

Bosch Rexroth AZPF Gear Pump Construction

The external gear pump consists essentially of a pair of gear wheels supported in bearing bushings and the housing with a front cover and an end cover.

 

The drive shaft protrudes from the front cover where it is usually sealed by the shaft seal. The bearing forces are absorbed by slide bearings. These bearings were designed for high pressures and have excellent emergency running properties, especially at low rotational speeds.

 

The gear wheels have 12 teeth. This keeps both flow pulsation and noise emission to a minimum. The sealing of the pressure chambers is achieved by forces depending on the working pressure. This ensures optimum efficiency. The working pressure generated in the gear chambers is transferred to the outside of the bearing bushings in specifically designed pressure fields in such a way that they are pressed against the gears and seal them up. The pressurized compression areas are limited by special seals. The seal in the area between the gear teeth and the housing is ensured by the smallest of gaps that are set depending on the pressure between the gear teeth and housing.

 

External Gear Pump Layout

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. Snap ring
2. Shaft seal
3. Front cover
4. Slide bearings
5. Centering pin
6. Gear wheel
7. Drive shaft
8. Housing seal ring
9. Pump housing
10. Bearing bushing
11. Axial field seal
12. Supporting element
13. Rear cover
14. Torx screws

 

WE ARE A BOSCH REXROTH DISTRIBUTOR

 

To enquire about Bosch Rexroth AZPF Gear Pumps and technical help with multiple Bosch Rexroth pump configuration options, please contact Neilson Hydraulics on: 01709 821002 / E: sales@neilson-hydraulics.co.uk or visit our website at:

http://www.neilson-hydraulics.co.uk/store/hydraulic-pumps/bosch-rexroth-external-gear-pumps

 

 

You can also view the Bosch Rexroth AZPF External Gear Pump Technical Data Sheet at:https://www.boschrexroth.com/en/gb/products/product-groups/industrial-hydraulics/pumps/external-gear-pumps/azpf

The cold months and winter maintenance present new challenges when it comes to keeping manufacturing plants running and avoiding costly downtime. Busy production periods in the run up to Christmas, reduced maintenance staff numbers and the negative impact of cold / adverse weather conditions on plants and machinery can create a number of challenges.

Does your factory or plant shut down over the Christmas period? Will you be undertaking any planned winter maintenance work during this time? At Neilson Hydraulics and also our sister company VHS Hydraulic Components we stock and supply a vast range of hydraulic components to meet all your hydraulic needs and importantly save you from costly downtime.

STOCK UP THIS WINTER.

HYDRAULIC FILTERS

Do your hydraulic filters and filter elements need replacing?

At Neilson Hydraulics, we supply the following Bosch Rexroth Filters and Bosch Rexroth Filter Elements:

 

 

 

 

 

 

 

 

 

 

 

 

 

Bosch Rexroth Inline Filters

Inline filters are used in hydraulic systems for separating solid materials from the hydraulic fluids and lubricating oils. They are intended for attachment in pipelines.

 

 

Bosch Rexroth Inline Filter with Filter Element according to DIN 24550

245 LE(N)

Key features include:

• Size according to DIN 24550: 0040 … 0400
• additional sizes: 0130, 0150
• Nominal pressure 250 bar
• Connection up to G1 1/2; SAE 1 1/2; SAE 24
• Operating temperature -10 … +100 °C

 

Bosch Rexroth Inline Filter with Filter Element according to DIN 24550

350 LE(N)

Key features include:

• Size 0040 … 1000
• Max. operating pressure 350 bar
• Flow, max. 650 l/min
• Connection G 1/2, G 1, G 1, G1 1/4, G1 1/4, G1 1/2, G1 1/2, G1 1/2, G2, G2
• Operating temperature -10 … +100 °C

 

 

Bosch Rexroth Replacement Filter Elements

The filter element is the central component of industrial filters. The actual filtration process takes part in the filter element. The main filter variables, such as retention capacity, dirt holding capacity and pressure loss are determined by the filter elements and the filter media used in them.

 

 

Bosch Rexroth Filter Element Type 2., according to DIN 24550 and Rexroth standard

Key features include:

• Size 0040 … 1000
• Pressure differential 30 bar, 160 bar or 330 bar
• Filter rating from 1 μm

BREATHERS

 

 

 

 

 

 

 

 

 

 

 

 

 

Des-Case Desiccant Breathers are a vital step in oil contamination control and the first line of defence against lubricant contamination. Studies have shown 50-70% of lubricant contamination can come from outside the equipment. As most machines are designed to ‘breathe’, protecting the source of airflow from moisture and particulate contamination is vital. Des-Case Breathers attack the source of contamination, making the products an affordable and cost-effective solution to extend lubricant life and to increase equipment productivity.

At Neilson Hydraulics, we supply Des-Case Standard Desiccant Breathers (DC-BB, DC-1, DC-2, DC-3 & DC-4).Des-Case Standard breathers provide simple, yet dependable protection from moisture and particulate contamination in lubricants and equipment across multiple industries and applications. These versatile breathers are five times more effective than the leading non-desiccant breathers, providing optimal defense against humidity for your applications.

HYDRAULIC SPARES

Do you have enough hydraulic spares to complete your planned maintenance work?

 

 

At Neilson Hydraulics, we are an official UK Danfoss Sales Partner. We stock and supply a wide range of Danfoss PVG 32 hydraulic components and spares, including:

Danfoss PVG 32 Inlet Section

 

 

 

 

 

 

 

 

 

 

 

Danfoss PVG 32 Valve Bodies

 

 

 

 

 

 

 

 

 

 

 

 

Danfoss PVG 32 Actuators, including Danfoss PVEA, Danfoss PVEH, Danfoss PVEM, Danfoss PVEO, Danfoss PVEO-R, Danfoss PVEA-DI, Danfoss PVEH-DI and Danfoss PVEH-F.

 

 

 

 

 

 

 

 

 

 

 

 

Danfoss PVG 32 Covers for Valve Bodies

 

 

 

 

 

 

 

 

 

 

 

 

 

Danfoss PVG 32 End Plates

 

 

 

 

 

 

 

 

 

 

 

 

Danfoss PVG 32 Bolt Kits

 

 

 

 

 

 

 

 

 

 

 

 

 

Danfoss PVG 32 Mechanical Handle Assembly

 

 

 

 

 

 

 

 

 

 

 

 

Danfoss PVG 32 Standard Flow Control Spools

 

Creating a strong preventative maintenance strategy and planning ahead is vital for manufacturers who want to work efficiently and avoid downtime during the cold winter months.

 

To check our stock levels and for help with any of your winter maintenance hydraulic needs, please call on Neilson Hydraulics on: 01709 821 002, E: sales@neilson-hydraulics.co.uk or visit www.neilson-hydraulics.co.uk.