The tapping system of the automatic lathe is also a complex transmission system of mechanical and electrical appliances. In the process of tapping, the tapping fault is often caused by some unexpected situations. Here are some common faults and troubleshooting methods.
One of the faults: the tapping shaft does not rotate after the tapping switch is activated.
1. The start switch is faulty, and the contact is poor or not accessible at all. You should first try it manually, confirming that the rocker arm is not pressed to the switch or the switch is broken. If the switch is broken, replace it. If the rocker arm is not in contact, just pull the switch arm a little.
2. The relay is faulty. Open the electrical box and listen to the relay for a touch of sound. There is no spark on the contacts. In case of failure, just replace the relay.
3. The clutch belt is loose or slippery. Check the clutch two shuttle drive belts, tighten the belt when loose, and replace the belt when it is broken.
4. The friction plate of the clutch is seriously worn. Repair and replace the clutch friction plate.
5, the transmission gear is off, or the transmission gear wears or explodes a few teeth. If the gear is turned off, just open the double-shaft seat and adjust the gear fixing ring sleeve to the position with an Allen key. The gear wears and replaces the gear.
6, transformer failure. Check if the voltage of the transformer 24V is normal, if the transformer is burnt out, replace the transformer.
7. The control box 24V fuse is blown. Replace the 3A fuse.
8, the tapping clutch does not work. Use a multimeter to measure the voltage of the three legs of the clutch "15, 12, 14" (no load DC 30V). If there is no voltage, the rectifier bridge stack must be replaced.
The second fault: unstable tapping depth
Unstable tapping depth is also a comprehensive fault, which is caused by many factors. The following is a detailed analysis.
Whether the tapping depth is stable is related to the tapping stop transmission system. The tapping stop transmission mechanism is a fixed ring sleeve on the tapping shaft, which drives the left and right brake rocker arms, and then drives the left and right brake link. The brake link hits the micro switch, the clutch brakes immediately, and the tapping stops. The tapping depth of a typical automatic lathe can be controlled within 0.5.
The tapping depth is unstable, and there are roughly the following faults.
1. The tapping shaft fixing ring sleeve is loose, and the φ5 pin on the brake rocker arm is loose or worn. (1) Check the screws on the fixing ring sleeve and the brake rocker arm, if it is loose, lock it; (2) Check the φ5 pin on the brake rocker arm. If it is worn, fix it 180 degrees or replace the pin. child.
2. The brake link fixing screw and the M5 adjusting screw are loose, causing the connecting rod yaw angle to be unstable. Check and tighten several retaining screws and adjusting screws on the brake link.
3. Tapping stops the micro switch is in poor contact. (1) Check the contact position between the wire and the micro switch on the brake link that is in contact with the micro switch. If the distance is large, it should be adjusted; (2) Check the contact condition of the micro switch, if not, if Replace the Microswitch.
4. Poor contact in the tapping relay. Check the contact surface of the relay for carbon or the surface of the contact is burned by the arc. If this is the case, replace the tapping relay.
5, the tapping brake is worn, the brake pad clearance is too large, causing the brake pad suction force to be too small and slipping. (1) Check the brakes. If the surface of the brake pads is relatively flat, just adjust the gap between the brake pads; (2) the brake pads are not flat, and the brake pads should be ground; (3) the brake pads that cannot be repaired. To be replaced.
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