Programmable Logic Controller referred to as PC or PLC is an electronic system operated by digital operations, specially designed for application in an industrial environment. It uses a memory that can be programmed to execute instructions for storing logical operations and sequence control, timing, counting and arithmetic operations, and through digital or analog input (I) and output (O) interfaces, controls various Type of mechanical equipment or production process. PLC is developed on the basis of electrical control technology and computer technology, and gradually developed into a new type of industrial control device with microprocessor as the core and integrating automation technology, computer technology and communication technology. PLC has been widely used in the automatic control of various production machinery and production processes.
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The advantages of indoor high voltage vacuum circuit breaker are not only oil-free equipment, but also long electrical life. It has mechanical life, large breaking insulation capacity, strong continuous breaking capacity, small volume, light weight, frequent operation, fire free, less operation and maintenance, etc. And they are quickly recognized by the operation, maintenance and technical personnel of the power department. The quality of some high voltage vacuum circuit breakers is not stable enough, the current carrying voltage is on the high side during operation and some vacuum interrupters still have air leakage. With the wide application of vacuum circuit breaker, faults also occur from time to time. The author analyzes the common faults of vacuum circuit breaker and gives treatment methods.
What factors should be taken into consideration when selecting a hydraulic motor? The first thing that should be focused on is the operating conditions of the hydraulic system, following which we should decide on the output torque, speed and power as needed so as to pick a right product model and specification.
Hydraulic motors are rotary actuators that convert hydraulic pressure supplied by the hydraulic pump into mechanical energy (such as torque and speed) applied to its output shaft. Hydraulic motors can be classified in different ways. Based on different rated revolving speed, there are high-speed and low-speed motors. And in terms of configuration, there are mainly four types of hydraulic motors among others, namely, gear motors, vane motors, radial plunger motors and axial plunger motors.
The thyristor power controller adopts thyristor (SCR or TRIAC) as the switching component, namely, a non-contact switch that can quickly and accurately control the closing time. It serves as an essential terminal equipment for power control designed for high precision and high dynamic indicators. It is worth noting that different loads and constraints of the operation environment determine different control modes and require various supporting equipment. Among control modes there are phase angle control, distributed crossover and time proportional zero crossover. In actual use, SCR power controllers can be sorted into single-phase SCR power controllers and three-phase SCR power controllers in accordance with their load types, power supply types and power supply voltage levels. So, how should we choose the right type of power controller and bring its optimum performance into play with minimal damage? The following passages will give you the answer.
A power regulator is a panel-mounted power adjustment unit that uses a thyristor (also called Silicon Controlled Rectifier or SCR) and its trigger control circuit to adjust the load power. Thanks for its small size, high efficiency and durable service life, it is widely used in AC and DC motor speed control system, power control system, follow-up system, temperature control and many other sectors. SCR power regulator works by means of an intelligent digital control circuit. Its precise control of voltage, current and power makes for precise temperature control. And its advanced digital control algorithm greatly improves energy efficiency, which highlights its important role in saving electric energy. Power regulators are becoming an indispensable equipment in the automation industry.
Planetary speed reducer is a kind of deceleration equipment with a wide range of uses. The precision of planetary reducer is very high. Under the premise of ensuring precise transmission, planetary reducer is mainly used to reduce speed, increase torque and reduce the load/motor moment of inertia ratio. Planetary reducer is also called servo reducer or servo planetary reducer. The gear reducer is an externally meshing involute helical cylindrical gear reducer produced according to the national professional standard ZBJ19004. This article compares the similarities and differences between two speed reducers in general, characteristics and application approaches.
Safety switch is a switch that prevents people from entering a dangerous area before all safety conditions are met. Also it is a device that monitors current in various applications. Safety switches can be used in major equipment applications (conveyor belts, production line equipment, heavy equipment) and electrical protection of whole system. The safety switch works by monitoring the current and detecting electrical faults, which means that in case of leakage, short circuit, overload, the safety switch will cut off the power supply of the faulty system almost immediately (within a few milliseconds).
The air blower is mainly composed of the following six parts: motor, air filter, blower body, air chamber, base (and oil tank), drip nozzle. The blower operates eccentrically on the rotor offset in the cylinder, and changes the volume between the blades in the rotor slot to suck in, compress, and discharge air. During operation, the pressure difference of the blower is used to automatically send the lubrication to the drip nozzle and drip into the cylinder to reduce friction and noise, while keeping the gas in the cylinder from returning. This type of air blower is also called a sliding vane blower. There are many types of air blowers, mainly divided into the following categories.
Bandwidth is one of the most important indexes of oscilloscope. The bandwidth of analog oscilloscope is a fixed value, while the bandwidth of digital oscilloscope has two kinds: analog bandwidth and digital real-time bandwidth. The maximum bandwidth that digital oscilloscope can achieve by using sequential sampling or random sampling technology for repeated signals is the digital real-time bandwidth of oscilloscope. The digital real-time bandwidth is related to the maximum digital frequency and waveform reconstruction technology factor K (digital real-time bandwidth = maximum digital rate / k), which is generally not directly given as an index.
Vibration meter is an instrument used to measure the peak value, peak-to-peak value, average value or root mean square value of vibration such as velocity, acceleration and displacement. The vibration meter can be applied in mechanical manufacturing, electric metallurgy, general aviation etc. The main parts of this instrument are integral differential circuit, amplifying circuit, voltage detector and meter head. The integral differential circuit is used to complete the integral differential operation between the above vibration quantities. Generally, integral and differential operational amplifiers can be used, low-pass filters and high pass filters can also be used to complete integral differential operations. However, we should pay attention to this instrument's application frequency range when we are using it for calculation. The vibration meter can only obtain the total intensity (vibration level) of the vibration, but cannot obtain other information, so its scope of using is limited.
Soft starter is a novel motor control device which integrates soft start, soft stop, light load energy saving and multiple protection functions. Its main structure is a three-phase anti parallel thyristor and its electronic control circuit connected in series between the power supply and the control...
A current transformer is an instrument that converts a large current on the primary side into a small current on the secondary side based on the principle of electromagnetic induction. The current transformer is composed of a closed core and windings. Its primary winding has a few turns and is stringed in the line of the current that needs to be measured. According to different uses, current transformers can be roughly divided into two categories: current transformers for measurement and current transformers for protection.
According to the relevant data and practice, the repeatability of the tool setting probe is 1 um, and that of the chuck less than 15 inches is 5 um. The repeated accuracy of the tool arm can reach 8um for the chuck of 18 inches and above. This precision can meet the needs of most users without trial cutting. The use of tool setting instrument reduces the auxiliary time of the machine tool and reduces the rework and scrap rate. The efficiency and accuracy of the machine tool can be significantly improved when the machine tool is used from the beginning to the end.
Digital oscilloscope is an indispensable tool for the design, manufacture and maintenance of electronic equipment. With the rapid development of technology and market demand, engineers need the best tools to quickly and accurately solve the measurement challenges. As the eyes of engineers, digital oscilloscope is very important to meet the current difficult measurement challenges. Because of the unique advantages of waveform trigger, storage, display, measurement, waveform data analysis and processing, digital oscilloscope is widely used. Due to the large performance difference between digital oscilloscope and analog oscilloscope, if used improperly, it will produce large measurement error, thus affecting the test task.
A current transformer is an instrument that converts a large current on the primary side into a small current on the secondary side based on the principle of electromagnetic induction. The current transformer is composed of a closed core and windings. Its primary winding has a few turns and is stringed in the line of the current that needs to be measured. This article will introduce the principles and precautions that should be paid attention to in the actual application of current transformers.
A current transformer is an instrument that converts a large current into a small current according to a certain transformation ratio. Current transformers are generally used to measure large currents. In modern technology, it is difficult to produce an AC instrument that can directly measure large currents, and even if they are manufactured, they will be brought to us when we use them. It's very dangerous. For this reason, clever technical engineers have manufactured current transformers based on the principles of transformers. In practical applications, current transformers also play many important roles. The following article will talk about the role of current transformers.
Introduction of limit switch
Limit switch is a kind of sensor to detect and control the mechanical movement beyond the limit displacement. For example, the position limiter of electric rolling shutter gate ensures that the motor will stop working when the gate is opened or closed to the specified position, so as to ensure that the motor and mechanical components will not be damaged due to excessive work. The commonly used limit switches include all kinds of travel switches, micro switches, and photoelectric switches. In short, as long as the corresponding detection device is equipped and the functional requirements are completed, they can be used as limit switches.
The blower is mainly composed of the following six parts: motor, air filter, blower body, air chamber, base, drip nozzle. The blower operates eccentrically on the rotor offset in the cylinder, and changes the volume between the blades in the rotor slot to suck in, compress, and discharge air. The pressure difference of the blower is used to automatically send lubrication to the drip nozzle, and drip into the cylinder to reduce friction and noise, while keeping the gas in the cylinder from returning. This type of blower is also called a sliding vane blower. This article will talk about the use of blowers.In order to ensure personal safety, the operator must be familiar with this regulation before starting, and operate the blower strictly in accordance with this regulation.
Displacement sensor, also known as linear sensor, is a linear device belonging to metal induction. The function of the sensor is to convert various measured physical quantities into electricity. According to the different forms of the measured variable, the displacement sensor can be divided into two types: the analog type and the digital type. The former can also be divided into two types: the physical type and the structure type. Commonly used displacement sensors are mostly analog structures, including potentiometer type displacement sensors, inductive displacement sensors, self-aligning machine, capacitive displacement sensors, eddy current displacement sensors, and Hall-type displacement sensors.
