Robo Cylinder is an electrically operated cylinder.
Cylinders include air cylinders that use compressor air (compressed air). There are also hydraulic cylinders that use oil pressure. Air and hydraulic cylinders are driven by fluid supplied from one or both sides of the cylinder. Robo Cylinders, on the other hand, are driven by electricity.
Although electrically driven, they can only move in a linear motion and operate on a single axis. In general, air cylinders can only position two or at most three points, while Robo Cylinders can position freely within their stroke range.
Robo Cylinders are used in a variety of applications, including processing, assembly, conveyance, and packaging equipment. The first advantage of Robo Cylinder over air cylinders is energy savings. The energy efficiency of air cylinders is generally poor due to the resistance of the piping through which the compressed air passes. It is known that the power consumption of Robo Cylinder is about one-tenth of that of air cylinders.
Other advantages include less shock when stopping, shorter tact time, easier design and manufacturing, and the ability to handle a wide variety of products. Robo Cylinder is the trade name for IAI's electric actuators, which are intended as a high-performance replacement for air cylinders.
Recently, a product called the Elecylinder, which specializes in movement between two points, has also been marketed, targeting the air cylinder market.
Robo Cylinder mainly consists of a ball screw, a linear guide, and an AC servo motor. Robo Cylinders are compact and suitable for use in equipment that handles lightweight materials.
Single-axis robots, which are larger and more rigid than Robot Cylinders, are used in equipment that handles heavy objects.
Ball screws are used to convert the rotational motion of a servomotor into linear motion. They are characterized by high power transmission accuracy and high positioning accuracy.
Linear guides are used to support the linear motion of ball screws. Ball screws only perform linear motion and are not very resistant to directions other than the direction of motion. Therefore, linear guides are used as a supplementary role to ensure that the linear motion of the ball screw is not interfered with.
AC servo motors are the power source of Robo Cylinder. The amount of rotation of the motor can be controlled by rotation control using an encoder. The controllable rotation of the motor allows the linear movement distance of the ball screw to be freely controlled. Therefore, the driving distance of Robo Cylinder can be freely adjusted.
Robo Cylinders, like air cylinders, can be roughly divided into two types: rod type and slider type.
The rod type is a type in which the rod extends and retracts. Although it requires a larger installation space, it is suitable for pushing operation. However, in order to receive radial loads, it is necessary to use a linear motion guide or select a guided type.
In the case of the rod type, the guide receives the moment load, so there is no problem if you select a model that can generate thrust in excess of the required thrust.
The slider type is integrated with a linear motion guide. The slider type can be used by attaching the moving object directly to the slider. In the slider type, the model is selected so that it falls within the tolerance range of the integrated linear motion guide.
First, determine the moment load applied to the slider based on the center of gravity position and weight of the moving object attached to the slider, and select a model so that the allowable moment load is not exceeded. Next, check the payload at the operating speed in the speed-carrying weight table in the catalog, and make sure that the weight of the moving object does not exceed the payload. Note that the payload varies greatly between horizontal and vertical mounting.
Robo Cylinder has functions such as position operation, positioning operation, and pushing operation, and Robo Cylinder is much more sophisticated than air cylinders.
Positioning operation is used when transferring multiple positions, and positioning operation is used when a host device sets the moving position by calculation or other means. Pressing operation is useful when clamping a workpiece with constant pressure.
1. Position Operation
To perform position operation, the stop position called "position" and the speed and acceleration at the time of movement must be registered in advance to a host device such as a PLC. In position operation, when a position number is specified by the host device, Robo Cylinder moves to the stop position corresponding to the position number.
2. Positioning Operation
In positioning operation, Robo Cylinder is operated by directly specifying the travel (or stop position), speed and acceleration at the time of movement by a host device such as a PLC.
3. Pushing Operation
In push operation, Robo Cylinder performs a push operation with a set push force. This operation is set by a teaching pendant or PC software and controlled by a host device.
*Including some distributors, etc.
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