1. No feed

When the manual operation hammer head moves normally, but there is no injection action when it is automatic, check the following items:

1. Whether manual or automatic selection knob is normal.

2. No input of mold locking signal: The mold locking termination sensor switch does not cooperate with the mold locking confirmation limit switch, and the mold locking termination sensor switch senses, but the mold locking termination confirmation limit switch is not pressed, or the limit switch is damaged.

3. The proximity switch is damaged when the material is shot.

4. Check if there is an electric signal for the first injection speed, return hammer oil valve, and whether the spool moves.

5. The injection time is too short.

6. The injection hydraulic cylinder is damaged.

7. No pressure in hydraulic system

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2. No thimble

The ejection hydraulic cylinder can not realize the ejection pin action, you should first observe whether the ejection pin work indicator on the electrical box panel is on or whether the computer has a signal output

1. If the indicator light is off or the computer has no signal output, check:

①Whether the mold is opened in place.

②If core-pulling is installed, check whether the core-pulling is in place.

③Whether the thimble limit switch is damaged.

2. If the computer has a signal output, check:

①Whether the thimble pressure is normal (observe the pressure gauge).

②Whether the fourteen-way amplifier board is normal (observe whether the thimble output indicator on the fourteen-way amplifier board is on).

③Whether the circuit from the fourteen-way amplifier board to the hydraulic valve is open, and whether the oil valve coil is normal.

⑤Check whether the thimble oil valve is normal and whether the thimble hydraulic cylinder has internal leakage.

⑥The ejector pin of the mold is stuck, and the ejector pin cannot be ejected.

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3. The hammer head does not return or the return hammer is not in place

Remove the hammer head and the hammer head connection components, and the injection piston rod can return to the position, indicating that the punch is stuck. If the injection piston rod still cannot return after the punch is removed or the return hammer is not in place, check.

1. Whether the return hammer in-position induction switch is damaged.

2. Whether the return hammer valve is damaged.

3. Whether the injection hydraulic cylinder is damaged.

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4. Leakage of hydraulic cylinder

The leakage of hydraulic cylinder includes external leakage and internal leakage. To

External leakage refers to the external leakage at the cylinder and cylinder head, cylinder bottom, oil port, exhaust valve, buffer regulating valve, cylinder head and piston rod, etc., which can be directly observed from the outside. To

Internal leakage refers to the leakage of pressure oil from the high-pressure chamber inside the hydraulic cylinder to the low-pressure chamber, which occurs at the connection between the piston and the inner wall of the cylinder, the inner hole of the piston and the piston rod. Internal leakage cannot be directly observed. It is necessary to unilaterally pass in pressure oil, stop the piston at a certain point or terminal, and observe whether there is oil leakage at the other port to determine whether there is internal leakage. To

Whether it is external leakage or internal leakage, the main reasons for leakage are: 1. Poor sealing. 2. The cylinder tube is compressed and expanded to produce internal leakage. 3. The hydraulic cylinder with welded structure will leak due to poor welding. To

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5. Noise occurs in the double pump oil supply system

When the system performs rapid movement, the hydraulic pump and the output pipeline produce abnormal noise. The following items should be checked:

1. The suction pipe or filter is blocked.

2. The pump sucks in air, traps oil and cavitation.

3. The pump housing is not firmly fixed.

4. The moving parts in the pump are stuck or inflexible.

5. The confluence position of the output oil of the dual pumps is too close to the outlet of the pump, and the confluence of the oil discharge pipes of the dual pumps should be greater than 200 mm from the pump outlet.