Are travel switches, limit switches, and proximity switches just a name? Is there a small difference between the three of them, and will this small difference affect our selection? Do you understand?

Limit switch: It can be installed on relatively static objects (such as fixed frames, door frames, etc., referred to as static objects) or moving objects (such as traveling cars, doors, etc.). When the object is close to the static object, the connecting rod of the switch drives the contact of the switch to cause the closed contact to break or the open contact to close. The switch contact open, and closed state change to control the circuit and the action of the mechanism. Limit switches can also be divided into rotary limit switches and linear limit switches.

Travel switch: is a kind of object displacement to determine the circuit switch, The travel switch and limit switch are position switches, but the travel switch can detect the trip and can be used as an input signal to control the circuit in a certain distance action.

Proximity switch: A proximity switch is also known as a non-contact travel switch, it can be completed in addition to the travel control and limit protection, or a non-contact type of detection device, used to detect the size of the parts and speed, etc, can also be used for frequency counters, frequency pulse generator, liquid level control, and processing programs, such as the automatic connection. Characterized by reliable operation, long life, low power consumption, high repositioning accuracy, high operating frequency, and adaptability to harsh working environments. Performance characteristics of various types of switches, the ability to "sense" the object close to it.

The difference between the three:

1. Proximity switches are non-contact switches with a long life and are suitable for "passing signals". 2.

2. limit switches (also called travel switches) are contact switches, suitable for single-direction position detection, due to contacts, relatively short life. 3. travel switches are also called limit switches.

3. A travel switch is also known as a limit switch, travel switch, and limit switch are position switches, but the travel switch can detect the travel and can be used as an input signal to control the circuit at a certain distance action. The difference between the limit switch detects the signal that limits the position and plays a role in stopping and protecting.

 
Proximity switch and travel switch difference?

01 Different roles

Proximity switches are non-contact switches with a longer life span, suitable for "passing signals". Travel switches are also called limit switches, travel switches and limit switches are position switches, but travel switches can detect travel, and can be used as an input signal to control the circuit at a certain distance action. The difference is that limit switches detect the signal that limits the position and play a role in stopping and protecting.
02 Trigger mode is different

Travel switch. When the animal is close to the static object, the linkage of the switch drives the contact of the switch to cause the closed contact to break or the open contact to close. By the switch contacts open, and close state change to control the action of the circuit and mechanism. An inductive proximity switch belongs to a kind of position sensor with switching output, which is composed of an LC high-frequency oscillator and amplification processing circuit, utilizing the metal object in the proximity of the oscillating induction head that can generate an electromagnetic field so that the object generates an eddy current inside. This eddy current reacts on the proximity switch, which makes the oscillating ability of the proximity switch decay and the parameters of the internal circuit change, thus recognizing the proximity of metal objects and controlling the switch on or off.
03 Different installation objects

Travel switches, also known as limit switches, can be installed on relatively static objects (such as fixed frames, door frames, etc., referred to as static objects) or moving objects (such as vehicles, doors, etc., referred to as animals). The proximity switch consists of an LC high-frequency oscillator and an amplification and processing circuit and utilizes a metal object to generate eddy currents inside the object when it is close to this oscillating inductive head that generates an electromagnetic field.

1, the proximity switch is a kind of position switch that can be operated without mechanical direct contact with moving parts. When the object approaches the sensing surface of the switch to the action distance, it does not need mechanical contact and any pressure to be exerted to make the switch act, so as to drive the DC electric apparatus or to provide the control instruction to the computer (plc) device.

At the same time, it is also a kind of switch-type sensors (i.e. non-contact switch), it has the characteristics of travel switches, micro-switches, and at the same time has the sensing performance, and reliable action, stable performance, fast frequency response, long application life, strong anti-interference ability, etc., and waterproof, shock-proof, corrosion-resistant and other characteristics. Products are inductive, capacitive, Hall type, AC and DC type.

2, limit switch is used to limit the movement of mechanical equipment limit position of the electrical switch. Limit switch has contact and non-contact. Contact type is more intuitive, mechanical equipment moving parts, installed on the travel switch, and its relative movement of the fixed point on the installation of the limit position of the block, or the opposite installation position.

When the mechanical contacts of the travel switch touches the block, cut off (or change) the control circuit, the machinery will stop running or change the operation. Due to the inertial motion of the machinery, this type of travel switch has a certain "overtravel" to protect the switch from damage. Non-contact form of many common reed switch, photoelectric, inductive, etc., these forms can be seen in the elevator. Of course there are more advanced forms.