What should I do if ejector pin of injection molding machine is swollen?
Time：2023-07-28 09:18:14 / Popularity： / Source：
Q 1. Manual operation is normal. In semi-automatic mode, you have to wait until mold opening is terminated before opening door. Thimble can be ejected, but ejector cannot be ejected before opening door.
A 1. Is it an imported machine? There is an interlocking device, just change mode to Asian mode.
2. An error occurred in computer program.
2. An error occurred in computer program.
Q 2. When thimble has [signal] and [pressure], it will not push, and thimble valve has been changed.
A 1 Check whether DC24V voltage has passed and whether ejector signal line is broken.
2 Check if there is any foreign matter in top plate of mold, or mold is damaged
3 Check whether valve plate hole is blocked. Check whether ejector hose is blocked.
4 Check whether inductive switch is good or bad.
5 Check jacking cylinder, you can confirm oil change pipe, if oil pipe is not moving, check solenoid valve or liquid valve.
2 Check if there is any foreign matter in top plate of mold, or mold is damaged
3 Check whether valve plate hole is blocked. Check whether ejector hose is blocked.
4 Check whether inductive switch is good or bad.
5 Check jacking cylinder, you can confirm oil change pipe, if oil pipe is not moving, check solenoid valve or liquid valve.
Q 3. There is a new mold, which is used to pull core. Thimble should be fully retracted before mold is closed. Mold is OK when mold is tested in mold factory, but it will not work when it comes to company (thimble does not return).
A 1 Is thimble back position set badly? Will adding some thimble oil to mold be okay?
2 It is necessary to understand structure of mold more clearly. If all thimbles are required to be returned before core is inserted, there must be a special agency on mold to force return.
3 How big is mold? Is it because screws on base plate are not installed properly? Another possibility is that mold spring is not strong enough and length is not enough!
4. Another good way is to add a thimble return device! Even if thimble device is back in place! Mold thimble will not return and will not lock mold!
5. Check top cylinder.
2 It is necessary to understand structure of mold more clearly. If all thimbles are required to be returned before core is inserted, there must be a special agency on mold to force return.
3 How big is mold? Is it because screws on base plate are not installed properly? Another possibility is that mold spring is not strong enough and length is not enough!
4. Another good way is to add a thimble return device! Even if thimble device is back in place! Mold thimble will not return and will not lock mold!
5. Check top cylinder.
Q 4. Thimble cannot stop when it is pushed in, and push stop switch is normal after inspection.
A 1. There is a problem with ejection solenoid valve or ejection pressure speed is too high or too fast, you can adjust pressure and speed.
2. When this happens, you can manually turn on ejector after shutting down, and at the same time, press switch to see if computer has output to confirm when ejector switch is OK.
2. When this happens, you can manually turn on ejector after shutting down, and at the same time, press switch to see if computer has output to confirm when ejector switch is OK.
Q 5. There is a lot of pressure when opening thimble and retreating, but retreating movement is so slow. What is reason?
A 1. Generally it is caused by clogging of valve body! Clean valve first.
2. Check piston ring of ejector cylinder, it may be that ejector pin oil seal is broken.
3. Process parameters are set correctly, and proportional output is linear.
2. Check piston ring of ejector cylinder, it may be that ejector pin oil seal is broken.
3. Process parameters are set correctly, and proportional output is linear.
Q 6. There is a 1300T machine. Recently, it was discovered that semi-automatic thimble will not retreat after being ejected. It needs to be closed before retreating. Time mode is selected in computer.
A 1. This is not a problem, it is choice of thimble setting mode.
① Top to set position without retreating,
② Return to position automatically
① Top to set position without retreating,
② Return to position automatically
Q 7. One machine. Thimble will automatically move forward (slow speed) during semi-automatic production and clamping, and thimble will be pressed back by high-pressure clamping. Thimble is normal before and after manual.
A 1 Sealing ring of thimble cylinder is damaged and thimble reversing valve is diarrhea.
2 Valve of thimble is not reset well.
2 Valve of thimble is not reset well.
Q 8. Thimble is set 3 times or 4 times. Why does it only move 1 or 2 times, and sometimes there is no one time, which leads to compression mold all the time?
A 1 Thimble electronic ruler is in poor contact, clean electronic ruler or replace it.
2 If program is set to eject 4 times, and actual eject does not follow program, it is recommended to reset computer and try.
3 Generally not, first try manually to see if output of computer every time thimble is activated (manual and semi-automatic are not same).
2 If program is set to eject 4 times, and actual eject does not follow program, it is recommended to reset computer and try.
3 Generally not, first try manually to see if output of computer every time thimble is activated (manual and semi-automatic are not same).
Q 9. Movement of a machine's thimble, size of pressure\speed will be linked with opening and locking of mold.
A 1 Check whether action is related to other actions besides action of mold opening and closing.
2 Check oil circuit of thimble action valve.
3 Check oil seal of thimble cylinder.
2 Check oil circuit of thimble action valve.
3 Check oil seal of thimble cylinder.
Q 10. There is a 1250T injection molding machine, and it suddenly appeared ----- abnormal noise occurs when ejector pin of mold is retracted (hand-touching ejection mechanism has a clear sense of shaking, shaking sound)
A 1 First determine where sound comes from, most of sound comes from mold.
2 There is air in thimble cylinder.
3 If there are other actions, it is a problem with oil pump and oil filter.
2 There is air in thimble cylinder.
3 If there are other actions, it is a problem with oil pump and oil filter.
Q 11. Haitian 90T has no action on switch mode, display is that thimble is not in place, there is no problem with electronic ruler, sensor is also no problem, and pressure gauge is also displayed. Solenoid valve at back has also been ok. Is there a problem with set parameters?
A 1 Display is that thimble is not in place: sensor switch is broken. Or sensor block cannot be sensed in a long distance. Or line is in poor contact. Check!
2 Increase ejection position of thimble slightly. (Greater than zero is fine)
3 Replace retractable electronic ruler wire and outer metal wire for reliable grounding.
2 Increase ejection position of thimble slightly. (Greater than zero is fine)
3 Replace retractable electronic ruler wire and outer metal wire for reliable grounding.
Q 12. Thimble sensor light of Haitian 85T machine does not light up. It is still same when replaced with a new one. Now machine does not open and lock mold, and machine is now in mold open state.
A 1 Check whether connecting wire of top-retract induction switch is broken, whether DC24V power supply of induction switch is normal, check whether induction switch from source is PNP or NPN, and whether replacement is same as original one.
2. There are indicator lights for every action on Haitian machine circuit board. Which light is on during top retreat is top retreat. If indicator is not on, top retreat has not stopped. Open output screen and check for confirmation.
2. There are indicator lights for every action on Haitian machine circuit board. Which light is on during top retreat is top retreat. If indicator is not on, top retreat has not stopped. Open output screen and check for confirmation.
Q 13. Thimble can't be returned, there is pressure, just close safety door one more time, what is reason?
A 1 ①Is there a problem with thimble return setting system: induction flicker?
②Is setting improperly: thimble return delay?
③Is there a problem with thimble oil seal: aging?
2 There is a problem with location setting! Or program error!
3 Check if there is signal input and output when computer is retracted! Thimble back travel switch is in poor contact. Check to see if there is an interface in the middle when switch was replaced before.
②Is setting improperly: thimble return delay?
③Is there a problem with thimble oil seal: aging?
2 There is a problem with location setting! Or program error!
3 Check if there is signal input and output when computer is retracted! Thimble back travel switch is in poor contact. Check to see if there is an interface in the middle when switch was replaced before.
Q 14. Injection molding machine of old-fashioned relay, in semi-automatic production, after mold is opened, ejector rod is not top, and product can only be ejected manually, I don't know where there is a problem. In semi-automatic production, it will not be ejected. It can only be topped in manual mode.
A 1 Mold opening position should not be set, and mold opening stop limit switch is not pressed.
2 Mold opening termination relay does not self-lock or there is a contact failure! There are many problems with these relays.
3 Check whether pre-plastic stop switch or electronic ruler is caused by displacement.
2 Mold opening termination relay does not self-lock or there is a contact failure! There are many problems with these relays.
3 Check whether pre-plastic stop switch or electronic ruler is caused by displacement.
Q 15. There is a machine that does not stop when mold is opened, and there will be an ejection action at the same time when mold is opened. After checking circuit IO board, oil circuit and directional valve, there is no problem.
A 1 There may be a problem with mold opening displacement ruler! Snails are loose.
2 Is it set to eject during mold opening? Check if ejection start position is less than end position of mold opening.
3 First, see if ejector pin moves at same speed as normal one. If it is ejected slowly, there is a problem with seal of cylinder or leakage in solenoid valve.
4 Try to reduce effective area of mold opening position.
2 Is it set to eject during mold opening? Check if ejection start position is less than end position of mold opening.
3 First, see if ejector pin moves at same speed as normal one. If it is ejected slowly, there is a problem with seal of cylinder or leakage in solenoid valve.
4 Try to reduce effective area of mold opening position.
Q 16. A 220T machine, semi-automatic and fully automatic ejector pins can push in and out, but manual can not, no input signal display, after inspection, panel keys are not broken.
A 1 Has connection line between panel and host been checked?
2 Is there an input signal to board? Is there a core-pulling chain?
3 Is there a problem with input on I/O board?
4 When ejection is manually opened, is it carried out at stop position of mold opening?
2 Is there an input signal to board? Is there a core-pulling chain?
3 Is there a problem with input on I/O board?
4 When ejection is manually opened, is it carried out at stop position of mold opening?
Q 17. There is a machine, when thimble is returned, alarm is always over-travel (tolerance has been adjusted very large). It still doesn't work if electronic ruler and circuit board are replaced.
A 1 Pressure speed setting of ejector pin retraction is too large.
2 If thimble is an electronic ruler, is it origin problem? Another problem is whether fixing screw of electronic ruler is loose.
3 Check whether P/Q output is linear.
4 Exchange computer board.
5 Adjust thimble electronic ruler line to a new one.
2 If thimble is an electronic ruler, is it origin problem? Another problem is whether fixing screw of electronic ruler is loose.
3 Check whether P/Q output is linear.
4 Exchange computer board.
5 Adjust thimble electronic ruler line to a new one.
Q 18. A 400T machine is set to eject once, and there are many times of ejection from time to time during production, and problem cannot be found at the moment.
A 1 CPU computer board is broken, replace it.
2 Vibration demoulding method is used, and ejection method is reset.
3 Spring mold is not in place, causing multiple ejections.
2 Vibration demoulding method is used, and ejection method is reset.
3 Spring mold is not in place, causing multiple ejections.
Q 19.Ejection force of ejector pin of a machine is too small. After pressure is increased, ejection force still does not change, but ejection pressure is high and speed is fast.
A 1 Oil seal of ejector cylinder is broken.
2 Check ejection solenoid valve.
3 Check set parameters and P, Q, pressure and flow output values.
2 Check ejection solenoid valve.
3 Check set parameters and P, Q, pressure and flow output values.
Q 20. Press and hold thimble forward button, thimble can't stop when it moves forward, it will run back a little, and then move forward again. What is reason for it?
A Mold thimble spring is too strong and top is not in place.
Q 21. What is reason why thimble is pushed several times continuously? Number of thimble is adjusted to twice.
A 1 I don't need vibration pallet and reset data.
2 If it is an old machine, there may be a problem with dialing code.
3 See if O-valve, or check valve is worn and leaking oil.
4 In this case, spring force of mold thimble is too strong, it is possible to push thimble back, computer cannot sense final position, has to go back and forth.
5 Computer program.
2 If it is an old machine, there may be a problem with dialing code.
3 See if O-valve, or check valve is worn and leaking oil.
4 In this case, spring force of mold thimble is too strong, it is possible to push thimble back, computer cannot sense final position, has to go back and forth.
5 Computer program.
Q 22. Jacking stop switch still has jacking action after being short-circuited. What is reason? How to eliminate it? Following inspection work has been done.
1 Switch has been confirmed to be good, because after short-circuiting, control board push-in stop light is on.
2 When pushing in, unplug electronic valve coil and action stops
3 Top back stop switch is good.
A 1 Solenoid valve is always output, I/O board output transistor has the greatest possibility of breakdown.
2 In manual state of stop, press jacking stop switch while pressing jacking button to see if there is any output signal.
3 Action of unplugging coil will stop, and it can be determined that solenoid valve is good. Please confirm whether input and output are normal, then make a judgment.
2 When pushing in, unplug electronic valve coil and action stops
3 Top back stop switch is good.
A 1 Solenoid valve is always output, I/O board output transistor has the greatest possibility of breakdown.
2 In manual state of stop, press jacking stop switch while pressing jacking button to see if there is any output signal.
3 Action of unplugging coil will stop, and it can be determined that solenoid valve is good. Please confirm whether input and output are normal, then make a judgment.
Q 23. After mold opening is terminated, there will be no thimble, what is problem with circuit? But there is no problem with oil circuit, thimble indicator will not light up, and there is no signal output.
A 1 Is mold opening terminated? If there is a termination, thimble has a signal.
2 Thimble control circuit may be broken? Check it!
3 When thimble moves, does thimble solenoid valve have electricity? Is there any response when pushing spool thimble tubing with a screwdriver?
4 It may be problem of light perception. Generally speaking, when mold is opened in place, thimble light sensor the light to output a voltage signal, and when mold is opened in place, use an object to approach light sensor to see if light is on and whether there is a voltage signal output.
5 Can it be operated in manual mode, and whether input conditions are met.
2 Thimble control circuit may be broken? Check it!
3 When thimble moves, does thimble solenoid valve have electricity? Is there any response when pushing spool thimble tubing with a screwdriver?
4 It may be problem of light perception. Generally speaking, when mold is opened in place, thimble light sensor the light to output a voltage signal, and when mold is opened in place, use an object to approach light sensor to see if light is on and whether there is a voltage signal output.
5 Can it be operated in manual mode, and whether input conditions are met.
Q 24. It returns to position without pressing down stroke switch, and ejector pin is too short, causing product to be unable to be taken out.
A 1 Check thimble travel switch! Then check seal of ejector cylinder.
2 Try to lower limit switch with a half detachment. If it is normal, increase jacking pressure.
3 Whether thimble control oil valve was wrong in last repair, and whether valve with differential quick opening was installed there.
4 Whether ejection vibration mode is set, mold is ejected and spring return device is not pushed back to switch.
2 Try to lower limit switch with a half detachment. If it is normal, increase jacking pressure.
3 Whether thimble control oil valve was wrong in last repair, and whether valve with differential quick opening was installed there.
4 Whether ejection vibration mode is set, mold is ejected and spring return device is not pushed back to switch.
Q 25. For a 1380T plastic machine, thimble often appears to be set 3 times but only 2 times.
A 1 Is thimble position set too long and top is not in place?
2 If there is time, time may be wrong.
3 It is recommended to replace top-retraction stop and front safety door travel switch. If internal contact of travel switch is jittered, said situation will appear.
4 Please re-adjust position and retreating, pressure speed of jacking .
5 Computer failure.
2 If there is time, time may be wrong.
3 It is recommended to replace top-retraction stop and front safety door travel switch. If internal contact of travel switch is jittered, said situation will appear.
4 Please re-adjust position and retreating, pressure speed of jacking .
5 Computer failure.
Q 26. Manual ejector output has pressure, and there is no pressure when it is semi-automatic (when there is action, no pressure, when you see ejection of computer board, pressure, flow, and ejection indicator lights are all on, and it is OK in manual state.
A 1 You can check chain action switch or ejection time control system after mold opening, pre-molding stop switch, etc.
2 If manual thimble action is no problem, but semi-automatically determines that there is an action output and there is no pressure in the oil circuit, check whether two proportional solenoid valves have current output during action! It is estimated that computer system has malfunctioned. See if computer system can be restored.
3 Check pressure leakage, shoot platform. Open and close mold...
2 If manual thimble action is no problem, but semi-automatically determines that there is an action output and there is no pressure in the oil circuit, check whether two proportional solenoid valves have current output during action! It is estimated that computer system has malfunctioned. See if computer system can be restored.
3 Check pressure leakage, shoot platform. Open and close mold...
Q 27. Why is there always a situation where it cannot be pushed back in production?
A 1 Mold needs to be maintained, and ejector rod is not lubricated enough.
2 Length of ejector rod is different, or pulling back of structural screw (length is also important) is unilaterally loose, not locked, or screw of machine supporting mold plate is loose, etc., may cause unbalanced return. Cause thimble to jam.
3 Mold loading problem, thimble rod may be unbalanced when loading mold.
2 Length of ejector rod is different, or pulling back of structural screw (length is also important) is unilaterally loose, not locked, or screw of machine supporting mold plate is loose, etc., may cause unbalanced return. Cause thimble to jam.
3 Mold loading problem, thimble rod may be unbalanced when loading mold.
Q 28. In semi-automatic mode, thimble still has a little movement after mold is locked.
A 1 Will thimble move a little when I hit another action? There may be a problem with thimble valve.
2 Is it pushing in or pushing back?
3 Check oil seal of ejector cylinder.
4 In manual state, open table to see how it reacts.
2 Is it pushing in or pushing back?
3 Check oil seal of ejector cylinder.
4 In manual state, open table to see how it reacts.
Q 29. What is reason why thimble stays but does not stop? Could it be a problem with thimble valve?
A 1 Make corresponding settings. If not, it may be that cylinder seal or reversing valve cannot be locked.
2 What is structure of thimble on mold? Is there any spring on mold?
3 Piston oil seal of thimble cylinder is damaged.
4 First, check if there is any problem with setting, and then check whether there is a signal waiting for thimble to advance? If so, it should be a cylinder problem.
5 If it is a quick return, it is estimated that it is a setting problem; if it is a slow return, it should be internal leakage of directional valve.
2 What is structure of thimble on mold? Is there any spring on mold?
3 Piston oil seal of thimble cylinder is damaged.
4 First, check if there is any problem with setting, and then check whether there is a signal waiting for thimble to advance? If so, it should be a cylinder problem.
5 If it is a quick return, it is estimated that it is a setting problem; if it is a slow return, it should be internal leakage of directional valve.
Q 30. There is a machine whose ejection speed is set to 60 and it cant be ejected, but it can be ejected when set speed is 61. Why is this?
A 1 Built-in computer sets 30% as a pressure and flow conversion point, and 31 is start of a new conversion point. Re-adjust linearity of P and Q values.
2 It is possible that one pump is broken. 60 uses a speed of 61 to rotate another pump. Many machines are controlled in this way.
3 There is also parameter setting of computer. One of them is to set flow rate of pump.
2 It is possible that one pump is broken. 60 uses a speed of 61 to rotate another pump. Many machines are controlled in this way.
3 There is also parameter setting of computer. One of them is to set flow rate of pump.
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