Illustration of the structure and principle of the door switch of a pulsator washing machine

The door switch system is a general term for the washing machine protection device. When the washing machine is working, if you open the upper cover of the washing machine and put your hands into the bucket to perform some operations, the high-speed rotating washing bucket may cause damage to the operator\’s hands. Therefore, the washing machine uses a door switch system to cut off the power supply in time after the operator opens the upper cover of the washing machine to avoid injury and play a protective role.

1. Structure of the door switch system of the pulsator washing machine

The door switch system of the pulsator washing machine mainly refers to the safety door switch of the washing machine. It is mainly used to detect the opening and closing of the upper cover of the pulsator washing machine, thereby controlling the power supply of the electrical system and playing a role in safety protection.

Only when the upper cover of the pulsator washing machine is closed and the safety door switch is closed, the electrical system will be energized to run the motor, thereby realizing washing, dehydration and other operations. . When the washing machine is in operation, if the upper cover is opened, or the washing tub shakes violently, causing the safety door switch to operate, the electrical system will lose power, causing the motor to stop working, and the washing machine will enter a power-off protection state. It can be seen that the safety door switch is an important protection device for the pulsator washing machine. The safety door switch of the pulsator washing machine and its installation position are shown in the figure below.

The safety door switch of the pulsator washing machine consists of pins, moving blocks, sliders, springs, contacts and levers etc. Its structure is shown in the figure below.

2. Wave Principle of door opening and closing system of wheel washing machine

The figure below shows the working principle of the safety door switch of the pulsator washing machine. The safety door switch can play a role in safety protection when the pulsator washing machine is powered on, and can also directly control the power supply of the motor. The safety door switch is usually installed Behind the pulsator washing machine frame, it is controlled by the upper cover of the pulsator washing machine when the upper cover of the washing machine is closed. , the moving block of the safety door switch will be lifted upward, causing the slider and the lower contact to move upward, and then the upper and lower contacts are closed, the motor is powered on, and can start running; and during the dehydration or washing process, open the upper cover. The moving block will drop downward, causing the slider and the lower contact to move downward, thereby disconnecting the upper and lower contacts, cutting off the power supply to the motor, and the high-speed running washing bucket will stop. Operation.

3. Troubleshooting

When the washing machine is dehydrating, if the clothes in the laundry tub are unevenly placed, it will cause the laundry tub to vibrate strongly. The strongly vibrating laundry tub will hit the lever of the safety door switch, causing the lever to tilt, causing the spring blades to bend and slide. Block drops, upper and lower contacts will be disconnected, thereby achieving the purpose of cutting off the motor power and stopping the washing bucket; when the upper cover of the washing machine is manually opened, the clothes in the bucket are placed evenly, and after the upper cover is closed again, the contacts of the safety door switch will close again, allowing the washing machine to You can continue to complete the dehydration work, as shown in the figure below.