자동차 도어록용 마이크로 스위치에 대해 알고 있습니까?
Do You Know The Difference Between A Micro Switch And A Limit Switch?
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.
마이크로 스위치, 소형 스냅 동작 스위치라고도 함, 자동차에 널리 사용되는 순간접점 스위치의 일종입니다., 산업, 센서로서의 의료기기. 스위치라고 합니다 “마이크로” on its name, which first started manufacturing it commercially. 이 스위치의 액추에이터에는 종종 푸시 버튼 위에 힌지 휠이 있습니다.. 이 스위치는 도어 인터록과 같은 제어 시스템 애플리케이션에 널리 사용됩니다., 엘리베이터의 안전 스위치, 자동 판매기, 등. With a diverse range of engineering applications, 마이크로 스위치는 다양한 스위치 구성으로 사용 가능, 주택 자재, 액추에이터 스타일, 등.
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? 예. 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, 안전, 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: fridges, tea kettles, mixers, washers, dryers, 그리고 더. The limit switches in these appliances are the same in principle but different in reliability. 다시 말해, 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!
다시 말해, 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: 평상시 열림, 평상시 닫힘, or Combination of Two.
평상시 열림 | 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 (이러한 긴장 변화는 일반적으로 세 가지 유형의 접촉을 갖는다.) and Normally Closed (이러한 긴장 변화는 일반적으로 세 가지 유형의 접촉을 갖는다.) 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 (IEC) 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. 예를 들어, 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.
첫 번째, disconnect the limit switch from the system and apply the ohmmeter leads to each terminal. 그 다음에, If the limit switch is normally open (이러한 긴장 변화는 일반적으로 세 가지 유형의 접촉을 갖는다.), the resistance should be very high.
다음, If it’s typically closed (이러한 긴장 변화는 일반적으로 세 가지 유형의 접촉을 갖는다.), 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. 일반적으로 말하면, 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, 롤러, 지렛대, 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: 평상시 열림, 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 시간.
Unionwell 마이크로 스위치 제조업체
후이저우 유니언웰 센싱 & 컨트롤전자㈜, Ltd는 자동차 산업 및 가전제품의 백색가전을 위한 고품질 마이크로 스위치를 전문으로 합니다.. 주요 제품에는 기본 마이크로 스위치가 포함됩니다., 방수 스위치, 공기압 스위치, 기계식 키보드 스위치, 도어 스위치, 등.
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