Construction hoist is vertical transport machinery driving by pinion and rack, mainly used on construction site for transportation of personal and materials. As a permanent or sub-permanent external elevator, it also applies to store house, dock, high tower, high chimney, etc.
There are single cage and double cages hoist. According to the need gets rid of one cage of double cages the hoist will be changed to single cage hoist. SC Construction Hoist is equipped with reliable electrical and mechanical safety device. It is efficient and safety vertical transporting equipment.
BQ supplying all kinds of construction hoist spare parts, including Construction Hoist Mast Section, Passenger Hoist Cage, Construction Hoist Anchorage Frame, Anti Fall Safety Device, Construction Hoist Overload Protector, Construction Hoist Reducer, Sliding Contact Line, Construction Hoist Motor, Passenger Hoist Rope Pulley, Construction Hoist Roller, Electromagnet Brake, etc.
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Tachometers are also called tachometers or tachometers and are used in the manufacture of motors, fans, paper, plastics, chemical fiber, washing machines, automobiles, airplanes, and ships. Maximum, minimum, and last measured values ​​can be memorized. Wide measuring range, high precision, can directly measure the rotational speed and line speed of various machinery and equipment, generally can be divided into the following categories, the next small series for everyone to introduce these 1. Centrifugal tachometer: Centrifugal speed The instrument uses the balance between centrifugal force and tension to indicate the speed. Centrifugal tachometer is the most traditional speed measurement tool. It is a mechanical tachometer that uses the principle of centrifugal force. The measurement accuracy is generally 1 to 2 levels, and it is generally installed on the spot. An excellent centrifugal tachometer not only has accurate and intuitive features, but also has the advantages of reliable and durable. However, the structure is more complicated.
2. Magnetic tachometer: The magnetic tachometer utilizes a rotating magnetic field to generate a rotational force on the metal cap and uses the balance of rotational force and balance force to indicate the rotational speed. The magnetic tachometer is a model for the successful use of magnetic force. It is a mechanical tachometer that uses the magnetic force principle. It is generally installed on the spot and can be installed in a short distance with a flexible shaft. Magnetic tachometer is simple in structure. Flexible shafts are easily damaged when installed in different places.
3, electric tachometer: tachometer Electric tachometer consists of small alternator, cable, motor and magnetic head. The small alternator produces alternating current. The alternating current is transmitted through the cable to drive a small AC motor. The speed of the small AC motor is the same as the speed of the shaft under test. The magnetic speed head and the small AC motor are coaxially connected together. The rotational speed indicated by the magnetic head is naturally the rotational speed of the measured shaft. The electric speed is convenient for installation in different places and has good vibration resistance. It is widely used in diesel engines and marine equipment.
4. Magnetoelectric tachometer: Magnetoelectric tachometer is a magnetoelectric sensor plus ammeter, which is very convenient for installation in different places.
5, flash type tachometer: Flash tachometer uses the principle of temporary vision. In addition to detecting rotational speed (reciprocating speed), the flash type tachometer can also observe the still image of a reciprocating moving object, which is an indispensable observation tool for understanding the working status of the mechanical equipment.
6, electronic tachometer: Based on modern electronic technology, design and manufacture of speed measurement tools. It generally has sensors and displays, and there are signal outputs and controls. Because of the variety of sensors and display devices, as well as the diversity of measurement methods, it is difficult to classify them as the first five. Here, electronic tachometers are classified separately from sensors and secondary instruments. If you choose from the installation and use methods, there are local installation, desktop, cabinet-mounted and portable and handheld.