微动开关包含限位开关
你知道微动开关和限位开关的区别吗?
The difference between limit switches and micro switches is mainly shown in appearance and application scenarios.
A limit switch has sturdy housing, and where it comes in contact with the object, a buffer distance is retracted by a spring. The internal microswitch can react immediately when it comes to contact with the object. Because of the buffer distance, the micro switch is protected.
一个微动开关, 也称为微型快动开关, 是一种广泛用于汽车的瞬时接触开关, 工业的, 和医疗仪器作为传感器. 开关被称为 “微” on its name, 首先开始商业化生产. 这些开关的执行器通常在按钮上方有一个铰链轮. 该开关广泛用于门联锁等控制系统应用, 电梯中的安全开关, 自动售货机, 欢迎来电咨询！. With a diverse range of engineering applications, 微动开关有多种开关配置, 外壳材料, 执行器样式, 欢迎来电咨询！.
What Is A Limit Switch?
A limit switch definition is a daily device that sends an electrical signal by physical interaction. The limit switch usually detects the actual object and sends an electrical signal to the machine, and then the machine will act as the predicted process.
These switches are initially used to define an object’s travel limit, and as a result, they were named limit switches.
Limit Switch Types
There are four general limit switches types:
- Whisker Limit Switch
- Roller Limit Switch
- Lever Limit Switch
- Plunger Limit Switch
But the four types of the limit switch are the standard. People apply the four types of microswitch to distinguish daily use. And depending on the actual application, a limit switch may be a combination of 2 general types, such as a roller-lever.
Limit Switches Applications
Limit Switches can be found in several everyday devices:
They are used in microwaves to check that the door is closed before an operation is allowed.
They are used in elevators to notify the system that the cabin has reached the desired floor.
Limit Switches are used in washing machine lids as permissive to start the wash cycle.
When you open the fridge door, a light comes on inside. How does that happen? 是的. You guessed it! A limit switch detects whether the fridge door is open or closed.
Let’s look at another application of a limit switch you may encounter at home. A limit switch on many overhead garage doors stops the door’s movement when it reaches its fully opened position.
Limit Switches In Elevator Systems
Elevator systems commonly require limit switches for various purposes by building codes. They are used for position detection, 安全, and the operational state of the elevator. The types used in this application are rated for an even more significant number of cycles as they constantly experience actuator movement through the system’s life.
Limit Switches In Household Systems
Limit Switches are used in everyday appliances: 冰箱, tea kettles, mixers, washers, dryers, 和更多. The limit switches in these appliances are the same in principle but different in reliability. 换句话说, they operate similarly but may fail much faster than their manufacturing counterparts.
How Do Limit Switches Work?
Limit micro switches are electromechanical devices with an actuator mechanically linked to an electrical switch. When an object contacts the actuator, the limit switch will operate, causing an electrical connection to make or break.
Why Is The Limit Switch Necessary?
When manufacturers want to connect the physical and electrical devices, they will first choose limit switches, Just for the inexpensive limit switches. Countless limit switches are found in manufacturing. They are used as control devices and safety devices for machinery and personnel. The limit switches will send a digital signal to the control system in all cases. The system can take appropriate action based on the hardware and software tied to said switches.
Limit switches have a long history. People apply it most daily life and industry manufacturing. The widely used limit switches make the cost lower than before!
换句话说, Limit switches play a vital role in manufacturing due to their simplicity and low cost.
Configurations Of Limit Switches
Limit switches configurations are available in several types: 常开, 常闭, or Combination of Two.
常开 | The limit switch will allow the current to pass once it is actuated. In the resting state, no current will pass through the switch.
Normal Closed | The limit switch will stop the current once it is actuated. In the resting state, the current will flow freely.
Combination of Two | The limit switch will provide a set of contacts used in Normally Open (不) and Normally Closed (数控) circuits.
Limit Switches Symbols
Depending on the origin of the electrical schematic, you may see limit switches drawn in different ways. The International Electrotechnical Commission (国际电工委员会) and the National Electrical Manufacturers Association (NEMA) have slightly different symbols.
Limit Switches In Action
Now that you’ve seen the limit switch in action, you are probably thinking about some of the applications you have seen. 例如, you might see limit switches operated by a container on an assembly line, a rotating machine part, or other moving mechanical objects. Limit switches could be used to count passing objects or determine the position of a hydraulic cylinder.
How To Know The Bad Or Good Of The Limit Switches?
You can often use a basic ohmmeter or Digital Multimeter (DMM)! It’s possible to determine whether or not a limit switch is bad.
第一的, disconnect the limit switch from the system and apply the ohmmeter leads to each terminal. 然后, If the limit switch is normally open (不), the resistance should be very high.
下一个, If it’s typically closed (数控), the resistance should be zero.
At Last, Toggle the limit switch into the active position and measure the resistance. It should be the opposite in this setting. If the transition does not occur, the limit switch is bad.
Proximity Sensor VS Limit Switch
Limit switches are slowly starting to disappear from many industrial applications. Proximity sensors are replacing them. Unlike a limit switch, a proximity sensor has no mechanical moving parts. A proximity sensor performs the switching action with electronic switches.
Limit switches will not wholly disappear soon as they outshine their proximity switch counterpart in their ruggedness and reliable operation in challenging environments. 通常来说，一般来说, limit switches can handle much higher current values than proximity sensors.
Micro Switch Inside Structure
Let’s look inside a micro switch, a limit switch type. Inside microswitch has two limit switches operating together and sharing a common terminal. One limit switch is usually open, and the other is typically closed.
Technically correct, the microswitch configuration is Single Pole Double Throw, commonly referred to as SPDT. This indicates that both switches are mechanically connected and will operate simultaneously.
Micro Switch Simple Circuit
Alright, let’s connect the microswitch to a lamp circuit. The Red lamp is on in the inactive state as the device is not being operated by an object pushing the Trigger. The device will activate when the Trigger is pushed, and the Green lamp will come on.
A Limit Switch Cannot Be Used As A Safety Interlock.
A limit switch is mainly used to limit the travel of the machine. It cannot be used as a safety interlock. But the micro switch does it!
Safety interlock switches are a means of safeguarding that monitors the position of a guard or gate. You can use them to shut off power, control personnel access, and prevent a machine from starting when the guard is open.
Summary
OK, let’s review…
– There are four general types of limit switches: whisker, 滚轴, 杠杆, and plunger.
– Limit switches are electromechanical devices operated by a physical force applied by an object.
– A limit switch is an electromechanical device consisting of an actuator mechanically linked to an electrical switch.
– Limit switches are available in several switch configurations: 常开, Closed, or one.
– Depending on the origin of the electrical schematic, you may see limit switches drawn in different ways.
– Proximity sensors in many applications are replacing limit switches.
If you have questions about using Limit switches, add them in the comments below, and we will get back to you in less than 24 小时.
Unionwell微动开关制造商
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Huizhou Greetech is an ISO9001, IATF16949 and ISO14001 certified micro switch manufacturer whose entire series of products have been granted global access permit certifications, 包括 ENEC, UL, CE, CB等全球安规认证, 欢迎来电咨询！. 截至目前，我们的全球影响力覆盖北美, 欧洲, 亚洲, 和南美洲.
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