4. Hydraulic Cylinders – The raising and lowering of the unit is actuated by high pressure hydraulic cylinders. On the average hydraulic scissor lift table, the number of cylinders will typically vary from 1 to as many as 4 cylinders.
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5. Motor / Power Pack / Power Source – Hydraulic lift tables are commonly powered by an electric motor. They can also be powered pneumatically via a high pressure industrial air compressor. Many lift tables will have a self contained motor such as the unit above (motor is located behind cylinders on reverse side). Some lifts will require a remote power pack that is located off to the side of the unit.
The hydraulic lift table raises as the motor pushes oil into the ram cylinder. After raising the unit and the motor has stopped, the oil stays in the hydraulic cylinder and the lift stays in the raised position thanks to a simple check valve.
The speed at which the lift table will raise under a full load is contingent upon a few different variables. Tables with higher capacities and travel will generally rise slower than light capacity short travel lifts.
Another component to consider is the motor horsepower. To increase speed, one may want to order a unit with a higher horsepower. However keep in mind, more horsepower is not always better and in fact can be detrimental to the structure. Using a 3HP motor instead of a 2HP motor could be enough to wear out the structure of the lift table 2 or 3 times faster than if the 2HP motor was used. The difference is a hard start vs. a soft start. Whats a “start” you might ask? A start is anytime someone pushes the up button and the motor engages to raise the platform. The structure of the lift table experiences the greatest stress at the start. Bumping the motor up to a unnecessary 3HP increases the amount stress the structure will encounter that much more than the appropriate 2HP motor.
Lastly, one of the most overlooked factors that determine lift speed is the voltage. A 230 or 460 volt 3-phase motor will generally raise the lift twice as fast as a 110-115 volt 1-phase motor.
The hydraulic lift table is lowered by a solenoid opening the down valve via the down switch on the pendant control. The down valve’s standard position is closed to ensure the platform doesn’t accidentally lower in the event of a power outage. When the down button is pressed on the pendant control, the solenoid triggers the valve to open, thereby allowing the hydraulic oil to return the oil reservoir.
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The speed at which the platform lowers is dependent upon the preset opening size of the flow control valve. The Flow Control (FC) valve is pressure compensated and set to regulate fluid flow at predetermined rate whether the lift is empty or loaded. In most cases, the Flow Control valve is set to match the lift table’s upward speed.
Self-propelled aerial access platforms, or aerial work platforms, are extremely handy machines on construction sites. That’s because workers need a stable and safe platform when they work at height. For example, in building renovations projects like in building joint renovation, some of the work is much easier to do from an aerial work platform. In these tasks, workers use electrical tools when they are working from the platform. How hydraulic generators can benefit the users of these machines?
Aerial work platforms are often equipped with an electrical socket installed onto the platform. The socket is wired via the boom of the machine, but the other end of the wire is not connected to anything. So, the socket on the platform is basically the end of an extension cord pre-installed into the boom. To get electricity out of the socket, you need to attach the other end of the cord to an electricity supply.
So, the user of the platform needs a power supply. Basically, there are three options: power grid, gasoline or diesel generator, or hydraulic generator.
The main benefit of equipping platforms with hydraulic generators is that the aerial work platform can produce electricity itself with it. So, instead of using an electricity grid or combustion engine generator via a long extension cord as the power supply, you can produce the electricity with your machine. In other words, you do not need to play with extension cords. In other words, the user can move the machine freely without worrying about the extension cords.
Aerial work platforms often use hydraulic power to lifting tasks. This makes the installation of a hydraulic generator easy because the machine already has a hydraulic system. That’s why aerial work platforms, bucket trucks, aerial lifts, and such are perfect machines to have a hydraulic generator.
Like you can see in the picture, the hydraulic generator is installed into the main unit of the aerial access platform. Because the hydraulic generator is installed in the main unit, it will not take up precious space on the platform itself. The electricity that is produced by the hydraulic generator is lead to the platform’s sockets via the pre-installed extension cord, which we mentioned before. And if the aerial access platform doesn’t have this pre-installed cord, mechanics can install it.
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