The principle of mechanical limit switches, the working principle of limit switches

Limit switches, also known as travel switches, can be installed on relatively stationary objects (such as fixed frames, door frames, etc., referred to as still life) or moving objects (such as cars, doors, etc., referred to as animals). When an animal approaches a still life, the connecting rod of the switch drives the contact of the switch, causing the closed contact to break or the disconnected contact to close. The circuit and motor are controlled by the change of the opening and closing state of the switch contact.

Limit switches are electrical switches used to limit the movement limit position of mechanical equipment. Limit switches are available in contact and non-contact versions. The contact type is more intuitive, and the moving parts of the mechanical equipment are installed with the upper travel switch, and the stop of the limit position is installed on the fixed point of the opposite movement, or the opposite installation position.

When the mechanical contact of the travel switch touches the stopper, the control circuit is cut off (or changed), and the machine stops or changes 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. There are many non-contact forms, such as reeds, photoelectric and inductive, etc., which can be seen in elevators.

Limit switch is a commonly used low-current master electrical appliance. The collision of the moving parts of the production machinery is used to make the contact action to realize the connection or break of the control circuit to achieve a certain control purpose. Generally, this type of switch is used to limit the position or stroke of mechanical movement, so that the moving machinery will automatically stop, reverse movement, variable speed movement or automatic reciprocating movement according to a certain position or stroke.

In the electrical control system, the function of the limit switch is to realize the sequence control, positioning control and position status detection. It is used to control the stroke and limit level protection of mechanical equipment. Construction: Consists of an operating head, a contact system and a housing.

In actual production, the limit switch is installed in a pre-arranged position, and when the module installed on the moving parts of the production machinery hits the travel switch, the contact action of the limit switch realizes the switching of the circuit. Therefore, a travel switch is an electrical appliance that switches circuits according to the travel position of the moving parts, and it works on a similar principle to a button.

Limit switches are widely used in various machine tools and lifting machinery to control their travel and carry out terminal limit protection. In the control circuit of the elevator, the travel switch is also used to control the speed of opening and closing the car door, the limit of automatic opening and closing of the door, and the upper and lower limit protection of the car.

Limit switches can be installed on relatively stationary objects (such as fixed frames, door frames, etc., referred to as still life) or moving objects (such as cars, doors, etc., referred to as animals). When an animal approaches a still life, the connecting rod of the switch drives the contact of the switch, causing the closed contact to break or the disconnected contact to close. The action of the circuit and mechanism is controlled by the change of the opening and closing state of the switch contact.

Are you satisfied with the above?

The most common limit switches are used in elevators. When the elevator reaches the specified position, the limit switch on the floor acts, and the control circuit judges that it stops on the floor, and the position requirements are very accurate.

Working principle: The limit switch is an electrical switch used to limit the movement limit position of mechanical equipment. Limit switch is a commonly used low-current master electrical appliance.

1. Limit switch (travel switch) is a mechanical switch used to control the stroke and limit protection of mechanical equipment, and the mechanical trigger parts and the limit switch actuator will produce mechanical contact.

2. The specific whether it is on or off depends on other electrical components used in combination with the travel switch, and it is not immutable. Generally speaking, when designing the circuit, according to the electrical components used, it must reach a on and B off, and B on and a off.

Limit switchesIt is an electrical appliance that realizes the switching of circuits according to the position of moving parts, and its principle is very similar to that of buttons. Limit switches are widely used in a variety of machine tools and lifting machinery to control travel and protect. Different types of limit switches are also very different in terms of their functions, so let's lead you to understand what brand of electric water heater is!

1. The use of limit switches is very extensive, and we can see it in many places, so do you know what its role is? The limit switch is actually a switch assembled inside the electrical shell to protect the micro switch from external force, water, oil, gas, dust and other substances. It is more suitable for occasions with high requirements for mechanical strength and environmental adaptability.

The shape of the limit switch is very rich, there are vertical, transverse, and composite types, which can be well used in the control and limit of lifting, transmission machinery and space coordinates in ports, builders, buildings, mines and other industries.

2. The types of limit switches can be divided into contact and non-contact according to different methods of use. The contact type is used on mechanical equipment and can be installed at the opposite fixed point of motion in the limit position or in the opposite position. When the contact of the switch touches the stopper, it can disconnect or change the circuit to stop or change the operation of the machine.

3. Limit switches can be divided into direct-acting, roller-acting, micro-acting and combined according to the structure. The principle of direct-acting limit switches is the same as that of pushbutton switches, but the opening and closing speed of their contacts is determined by the operating speed of the production machinery. Once the first orange roller limit switch is hit by the mechanical collision bar, the collision bar will hit the right, and the cam will rotate to make the contacts in the switch move.

When the machine returns, each action is reset under the action of the return spring.

What are the types of light switches?

1. The types of light switches are classified according to their uses: fluctuation switches, band switches, recording and playback switches, power switches, pre-selection switches, limit switches, control switches, transfer switches, isolation switches, travel switches, wall switches, intelligent fire switches, etc.

2. The types of light switches are classified according to the structure: micro switches, boat-shaped switches, toggle switches, toggle switches, button switches, key switches, as well as fashionable membrane switches and point switches.

3. The types of light switches are classified according to the type of contact: the switch can be divided into three types: A-type contact, B-type contact and C-type contact according to the contact type. The contact type refers to the relationship between the operation condition and the contact state after the switch is operated (pressed).

It is necessary to select the appropriate contact type switch according to the application.

4. The types of light switches are classified according to the number of switches: single control switch, double control switch, multi-control switch, dimming switch, speed control switch, splash-proof box, doorbell switch, induction switch, touch switch, remote control switch, smart switch, plug-in card power switch, bath bomb special switch.