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Working principle and fault analysis of comprehensive treatment machine
- 2018-10-23-

The dental comprehensive treatment machine is called a dental chair, and it is an essential medical equipment for the dentist to diagnose, prevent, treat, and operate the patient. Gas, water and electricity are the three essential elements of a dental comprehensive treatment chair. The working principle of the treatment machine is mostly to control the water and electricity. Explore the waterway, gas path and circuit working system of the internal design of the dental unit, the working principle of the main structure and the analysis and treatment of common faults.

How the dental unit works

The electric dental chair (single chair) mainly regulates the position of the patient throughout the treatment machine. It mainly uses low voltage 24V power supply. The upper and lower motor, button board and foot control switch are connected by wires and controller. When the controller is energized, the doctor can control the lifting of the chair frame or the backrest of the backrest through the foot control switch or the keypad. Tilt, so adjust to the treatment position that the doctor needs.

The treatment table is a doctor's workbench. It is mainly composed of a control panel, a foot switch, a pylon switch, a high-speed turbine mobile phone, a low-speed pneumatic mobile phone, a three-purpose spray gun, a mouth water supply, and a sputum device. When the gas source and the water source enter the equipment from the ground box, they are first connected to the diverter valve in the side box, and then the diverter valve is used to extract the electromagnetic valve of the strong and weak suction, the solenoid valve of the water cup and the water and gas in the instrument. Six-way, water and gas through the strong and weak suction solenoid valve led out through the strong weak suction generator and finally reach the strong and weak straw, when the strong and weak straw is picked up from the hanger, the hanger switch opens the strong and weak suction through the strong and weak suction circuit board The solenoid valve, so that the water and gas quickly form a negative pressure through the strong and weak suction generator for the doctor to use when sucking. The water source is led out through the water cup solenoid valve and finally reaches the flushing nozzle and the water supply nozzle through the throttle valve. The button on the button board controls the opening and closing of the water cup solenoid valve for the patient to use the mouthwash and the flushing water. The water and gas are led out through the diverter valve in the side box to reach the water and gas separation six-way in the instrument tray, and then respectively lead to the water and gas solenoid valve of the high-speed and low-speed mobile phone, and then reach the mobile phone through the water-gas throttle valve. The foot switch is the main switch of the three groups of mobile phones, and the pylon switch is the switch of each group of mobile phones, and the water mainly plays the role of cooling and heat dissipation.

Oral surgical lights are mainly used to provide illumination for doctors in the device, clear vision of treatment. It uses low-voltage AC 10V and 12V power supply, through the switch on the lamp head to control the bulb's strong light weak light to open or close.

The viewing lights are mainly used by doctors to view X-ray films. It uses low-voltage AC 24V power supply, there is a control switch next to the lamp, and some devices will have one more switch on the main control board to facilitate the doctor's operation.

Common faults and elimination of dental comprehensive treatment machine

Lifting system: 1The upper and lower motor does not work or one of the motors does not work: Check if the limit switch is damaged or stuck; check if the programmable controller has power input. If there is no power input, check if the transformer and circuit in the programmable controller are burnt out. Then, the AC 24V of the treatment machine transformer can be directly led to the programmable controller circuit board; if the programmable controller circuit board burns out, the entire program controller can be replaced. One of the upper and lower motors does not work. Change the plug of the upper and lower motor, and then press the lifting button of the upper and lower motor to confirm whether a motor that is not working is normal. If one motor that does not work after the replacement still does not work, replace the damaged motor. 2 The motor does not work or stops after lifting for a while: Check whether the plugs of the main control line are loosely connected, and re-insert the plugs. Check if the programmer's circuit board is wet and water, causing the circuit board to control the motor signal to malfunction. If it is a programmer problem, replace the program controller. Check the motor for damage, such as damage to the motor. Check whether the main control board is out of order or short circuit (with circuit mask), which can not transmit signals or enter the settings. If the above reasons are met, replace the main control board.

Sucking system: 1 strong and weak suction does not work: check whether the micro switch of the strong and weak suction rack is stuck or damaged. If the micro switch is stuck, use a blade or other tool to open a large hole in the rack box. If the micro switch is damaged, replace the micro switch. Check if the solenoid valve is damaged. If you replace the solenoid valve (measured with a multimeter). Check if the strong and weak suction plate is burnt out. If it is burnt out, replace the strong and weak suction plate. Check if the weak suction cup is clogged with impurities, and remove it; check if the weak suction pipe has a tight seal and remove it. 2 weak suction during work for a period of time, the suction is weakened or there is no suction or weak water backflow: check whether all the user's water pressure reaches the pressure required by the treatment machine. If the user's water pressure does not meet the requirements, it is recommended that the user increase the pressure equipment to achieve the desired Water pressure. Check if the weak suction cup cup is full of blockage, such as cleaning the collecting cup, filter and connecting nozzle. Check if the water quantity of the solenoid valve is reduced. If the water volume of the solenoid valve does not meet the requirements, replace the solenoid valve or remove the valve core of the solenoid valve to see if there is any debris blocking. If there is any debris, clear it. Check if the weak suction lines are folded. Check if the collecting cup is tight. If it is not tightened, the air leakage or the sliding wire can be sealed and tightened with the raw material belt. Check if the weak suction pipe is discounted or the drainage is not smooth, and it can be cleaned with water.

Mobile phone control system: 1 The mobile phone does not work: Check if the mobile phone hanger switch is stuck or damaged. If the micro switch is stuck, use the paper knife to enlarge the micro switch hole position to make the activity flexible, such as the micro switch damage. , replace the micro switch. Check if the foot switch is working. If it is not working, remove the foot switch assembly and check if the micro switch is damaged or the cable is disconnected. If the micro switch is damaged, replace the micro switch. If the micro switch is disconnected, Re-weld. Use a multimeter to measure whether the solenoid valve is burnt out. If the solenoid valve burns out (measured if the resistance is normal), replace the solenoid valve. 2 The mobile phone works but there is no water or water out of the air: Check if the mobile phone tube is discounted or there is any debris, and the pipeline can be dredged. Check that the throttle that controls the moisture in the phone is turned on. Check if the solenoid valve is burnt out (measured with a multimeter). If it is burnt out, replace the solenoid valve. Check if the solenoid valve is blocked by debris and it will be clear. Check whether the water source switching valve and the gas main switch are consistent with the water source gear position; if the water source switching valve has not reached the required gear position, check whether the water source switching valve is unblocked. If it is not smooth, replace the water source switching valve; For example, if the water is in the water bottle, check whether the gas switch has air pressure and put it into the water bottle. If there is no gas input into the water bottle, check if the 2kg pressure reducing valve is open or damaged. If it is damaged, replace the damaged accessories. Check the connection of the micro switch of the pylon, whether the connection of the solenoid valve is off, and whether the micro switch is stuck. 3 The mobile phone is out of control: Check if the solenoid valve has debris and block the valve core, resulting in poor sealing. If there is any debris, the solenoid valve spool can be sealed tightly. Check if the foot switch board is stuck, causing the micro switch to be short-circuited. If so, adjust the tightness of the foot pedal. Check if the foot switch wiring is short-circuited, if it is re-welded and insulated. 4 Water leakage when the mobile phone is stopped: Check if the solenoid valve spool is clogged with impurities, so that the solenoid valve is not tightly sealed, such as removing debris. Check if the water pipe between the solenoid valve and the throttle valve and the integrated block of the mobile phone is too soft, and if so, replace the water pipe. 5 After the mobile phone is used for a period of time, the air pressure cannot be adjusted to the required requirements: check whether the air pressure of the air filter pressure reducing valve in the ground box is adjusted to the required air pressure of the therapeutic machine; if it is not possible, check whether the air pressure of the compressor reaches the required pressure. Air pressure. Check if there is too much sewage in the air filter regulator and compressor, and if so, drain the sewage. Check if the solenoid valve spool is blocked or the magnetic force is weakened, such as blocking the bust; if the magnetic force is weak, replace the solenoid valve. Check if the inner tube of the mobile phone is aging and rupture, and if so, replace the mobile phone tube. 6 The water storage bottle has no water for the treatment table: Check whether the water source switching valve and air switch are in the position of using the water storage bottle. Check whether the pipelines of the water storage system are blocked or not. If the pipeline is dredged. Check if the water source switching valve and air switch are damaged, and replace if damaged. Check if the 2kg pressure reducing valve has a gas source through the gas to the water storage bottle. If not, adjust the 2kg pressure reducing valve, and the air pressure can be passed.

Lighting system: 1 The oral lamp does not work: Check if the bulb is burnt out, if the bulb is burnt out, replace the bulb. Check if the transformer has 12V, 10V output, if the transformer is not replaced. Check if the manual switch is damaged or not open, such as the manual switch is not open. 2 The viewing light does not light: Check if the light bulb is burnt out. If the light bulb burns out, replace the light bulb. Check if the controlled button switch is malfunctioning, such as a malfunction to replace the mask. Check whether the controlled circuit board and each plug are loose or burnt. If the plug is loose, re-weld it. If the board burns out, replace the board.