Causes and solutions of polyurea spraying equipment failure
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Causes and solutions of polyurea spraying equipment failure

Views:3     Author:Site Editor     Publish Time: 2020-07-24      Origin:Site

  •  Booster pump failure of polyurea spraying equipment

1. Booster pump leakage

Insufficient strength of the oil cup to press the seals leads to leakage.

Long-term use of seal wear.

2. There are black crystals on the shaft

The oil cup is not tightly sealed, and the booster pump shaft does not stop at the bottom dead center pump shaft. It stays for a long time after there is black material on it.

Although the oil cup was tightened, the contaminated lubricant was not replaced.


  • The pressure of the two raw materials of the polyurea spraying equipment is different, greater than 2Mpa

1. The cause of the gun

Different sizes of holes on both sides of the tip.

Gun body black material filter is partially blocked.

The friction attachment is slightly blocked.

The material channel before and after the raw material valve is not completely blocked.

The friction attached discharge hole and the holes on both sides of the gun head are not aligned.

There is residual material in the mixing chamber of the gun head.

One of the raw materials is seriously leaking at the friction attachment.

2. Reasons for raw materials

One of the raw materials is too viscous.

White material temperature is too high.

3. Material pipe and heating

The material flow is not smooth due to incomplete blockage in the material pipe.

The material pipe is bent into dead bends in many places, which makes the flow of raw materials not smooth.

The heater is set too low for the raw material temperature.

Raw material pressure gauge malfunction.

One of the heaters failed.

The heater is not completely blocked due to foreign matter.

Material pipe and equipment do not match.

4. Reasons for booster pump

Serious material leakage at the booster pump oil cup.

The bottom of the booster pump is not tightly sealed.

The lower valve body of the booster pump is not tightly sealed.

The bowl of the booster pump is worn or the bowl holder is broken.

The thread of the lower valve body of the booster pump is loose or the lower valve body falls off.

The nut on the top of the booster pump shaft is loose.

Damaged "O" ring in the bottom of the booster pump.

5. Reasons for lifting pump

The bottom of the lift pump is not completely blocked.

The filter at the outlet of the lifting pump is not completely blocked.

The lift pump does not work.

Serious internal leakage of the lift pump.


  • Polyurea spray equipment lifting pump failure

1. The lift pump does not work

The oil cup is too tight to lock the lifting shaft.

Lifting shaft. The upper crystal will jam the lifting pump, making the lifting pump unable to work.

The rubber of the reversing rubber cover falls off, and the "O" seal is not tightly sealed, making the lifting pump unable to work.

The lifting pump is inserted into the raw material barrel by mistake, causing foaming in the pump.

The black material is stuck in the pump and cannot work.

Insufficient air pressure or no air source.

The outlet filter of the feed pump is blocked.

The friction resistance of the air motor piston is too large.

One of the guns' outlet doesn't discharge raw material.

The lower return spring in the cylinder has insufficient elasticity.

2. Leakage of the lift pump

Due to long-term use, the "O" ring and "V" ring are worn out.

(Reversing rubber cover) wear.

Air leakage at the thread of the reversing assembly.

Reversing assembly falls off.

3. Leakage of the lifting pump

Generally refers to material leakage at the lifting shaft, tighten the oil cup to increase the pressure on the lifting shaft sealing ring.

Leakage at other threads.

4. Severe jump of the lifting pump

No raw material in raw material barrel.

The bottom of the pump is blocked.

Raw material viscosity is too thick or too thin.

Lifting material bowl falls off.


  • Uneven mixing of two raw materials for polyurea spraying equipment

1. Booster pump air source pressure

The triplet pressure reducing valve adjusts the air source pressure to be too low.

The discharge pressure of the air compressor cannot meet the requirements of the foaming equipment.

The air pipe from the air compressor to the foaming equipment is too thin and too long.

Excessive moisture in compressed air hinders air flow.

2. Raw material temperature

The heating temperature of the equipment is not enough for raw materials.

The initial temperature of the raw materials is too low and exceeds the scope of equipment.


  • The host of polyurea spraying equipment does not work

1. Electrical reasons

The emergency stop switch is not reset.

Proximity switch is damaged.

Proximity switch position shift.

The two-position five-way solenoid valve is out of control.

The reset switch is in the reset state.

Insurance burnout

2. Causes of gas path

Blocked solenoid valve airway.

Freezing of solenoid valve airway.

The "O" ring inside the solenoid valve is not tightly closed and the solenoid valve cannot work.

The air motor is severely short of oil.

The screw at the connection between the piston and the shaft in the cylinder is loose.

3. Reasons for booster pump

The oil cup was too tight.

Black material crystals on the lifting shaft are stuck.

Unpredictable(One part of the discharge pipe is blocked).

The black material is solidly dead in the pump.

The pole screw is too loose.

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