Tower Crane cabin is the control center of the crane and is attached to the slewing unit. In order to get to the tower crane cab, the operator must climb a series of ladders within the mast.
The movement of the tower crane is controlled from the operator's cabin. Within the tower crane cabin, you'll find the operator's chair with joystick controller, electronic monitoring devices, and communication systems. Many cabins come with climate control to ensure a comfortable work environment. The Operator Cabin for Tower Crane is part of the slewing assembly.
A cabin for a tower crane is a small enclosed space located at the top of the tower crane Mast Section or tower crane jib. It is where the crane operator sits and controls the crane's movements and operations. The tower crane cabin is typically made of steel or aluminum and is designed to provide a safe and comfortable working environment for the operator. It is equipped with controls, instruments, and communication systems that allow the operator to maneuver the crane, lift and lower loads, and communicate with other personnel on the construction site. The cabin is often equipped with heating and air conditioning systems to ensure the operator's comfort in various weather conditions. Safety features such as guardrails, harness attachment points, and emergency controls are also included in the cabin design to protect the operator in case of accidents or emergencies. Tower Crane Cab,Tower Crane Cabin Chair,Tower Crane Operator Cabin, Operator Cabin for Tower Crane,Driver's Cabin for Tower Crane SHEN YANG BAOQUAN , https://www.bq-cranes.com
Improve Positioning Precision for Autosamplers with High Resolution and Encoder Type Stepper Motors
In this article, we're diving deeper into two types of stepper motors: high-resolution and encoder type, and how they can enhance precision in critical laboratory automation applications like autosamplers.
Autosamplers are automated systems that provide samples to analytical instruments for testing. These machines are widely used in laboratories to automate the process of analyzing a large number of samples. They can collect samples from a central source and deliver them to a sampling station or bring the sampling instrument to the sample on a carousel. For example, in medical labs, autosamplers are used to test blood samples for viral diseases.
Positioning precision is essential in these applications, making both servo and stepper motors popular choices. Stepper motors offer precise control and positioning accuracy, which makes them ideal for motion axes such as sample injection and syringe movement. For more demanding tasks, like robotic arms, servo motors may be preferred due to their higher torque and speed capabilities. Regardless of the motor type, mechanisms like belt and pulley, ball screw, or rack and pinion systems are often used to convert rotary motion into linear motion. In this article, we will focus specifically on stepper motors.
There are various examples of autosamplers, such as those designed for liquid or gaseous samples and others for solid samples in gamma ray measurement. These devices rely heavily on accurate motor performance to ensure reliable operation.
A standard 2-phase hybrid stepper motor typically has a step angle of 1.8° and can achieve ±0.05° (±3 arc minutes) stop accuracy in open-loop operation. Enhancing the motor's positioning precision can significantly improve machine performance.
To improve the positioning precision of stepper motors, you can increase the motor's resolution or add an encoder (or both). In this article, we will explore two specific types of stepper motors that help: high-resolution type and encoder type.
High-resolution type stepper motors feature a doubled number of rotor teeth compared to standard models, reducing the tooth pitch from 7.2° to 3.6°. This results in a smaller basic step angle of 0.9°, offering finer resolution and improved movement precision. The increased resolution allows for better accuracy, especially in applications like ball screw systems where frictional loads can affect performance.
Encoder type stepper motors add an encoder to the rear shaft, enabling closed-loop feedback. This allows the controller to monitor the motor’s travel distance by comparing commanded steps with encoder pulses, quickly correcting any missed steps to prevent delays. Encoders also provide enhanced reliability, ensuring consistent performance even under varying loads.
Oriental Motor offers the PKP Series, which includes both high-resolution and encoder-type stepper motors. These motors are available in different configurations, such as 2-phase bipolar, 2-phase unipolar, and 5-phase bipolar, to suit various driver setups. The 5-phase motor is particularly useful in applications requiring lower vibration or noise.
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