Energy-efficient multipurpose hydraulic test bench with secondary control
The IHA has developed a test bench for the broadest possible range of applications in testing hydraulic components and systems.
Normally, test benches are developed for specific tasks and components, such as testing pumps and valves in an open circuit. The load on pumps is usually generated using pressure limiting valves or chokes, which convert the load energy into heat.
It is not normally possible to test individual pumps together with the controllers. The pump manufacturers test their pumps and the valve manufacturers test their valves. They are not used together until they have been installed in the machine or system at the user's site. But now with the IHA multipurpose test bench, individual pumps can be inspected together with their associated system components.
The secondary drive unit used on this test bench also has a substantially lower energy requirement. Under positive loads (e.g., raising a winch), energy is drawn from the high-pressure network and under negative loads (e.g., lowering a winch), energy is returned to the high-pressure network via the secondary drive units. This returned energy can be used by other drive units or stored in accumulators for later use. Several secondary units having quite different capacities can be operated in parallel on the pressure network with no throttling losses.
Pumps and motors with max. M= 700 Nm, n= 2200 rpm or M= 750 Nm, n= 1450 rpm can be connected to the secondary drive units. Controllers or components can be mounted between the pump and the brake motor. The speed of the pump can be used to regulate the flow rate, while the load pressure is varied by the magnitude and direction of the braking moment. Maximum torque limits can be set individually depending on the requirements of the application.
This means that the following capabilities are available to users of hydraulic systems in mobile and industrial hydraulics:
• Manufacturer-independent analysis of pumps, motors, valves and control blocks
• Optimisation of prototypes
• Consulting on development projects
• Preparing expert assessments
• Calculating characteristic values for simulations
• Verifying simulations
• Inspecting imported products for distributors
Test bench for salt-spray test
We use this test bench for short-duration weathering tests to very quickly show possible corrosion damage to metal components which would otherwise require field testing lasting several years.
Proof of a successful test is demanded by customers from almost every branch of industrial production. For example, it is particularly important for the automotive industry, the consumer goods industry, as well as the traditional machine building and plant construction applications, to which hydraulics itself belongs.
For the duration of the test, which normally lasts anywhere from 100 to 720 hours, the sample parts are exposed to simulated weathering influences in a salt-spray test chamber, which take the form of a controlled saline mist. The chamber is opened at previously defined intervals (often every 24 hours) and the samples are examined for corrosion damage. The samples are also photographed at the same time to provide the most thorough record possible.
The IHA test bench satisfies these requirements and the associated standards:
• DIN 50021 - Salt spray tests with various sodium chloride solutions
-> Now rescinded and replaced internationally by:
ISO 9227 - Corrosion tests in artificial atmospheres - Salt spray tests