What s going on with the leakage in the fast feed cylinder of the Zoomlion trailer pump

After the concrete pump is used for a period of time, it is very simple to present this or that problem, and the concrete conveyor cylinder does not operate or may be weak.

That's one of them. So what should I do if the concrete delivery cylinder does not work? For this question, we interviewed the people and relevant experts.

Experts pointed out that in the construction process of the concrete pump, it is common to see that the concrete conveying cylinder is not operating or the operation is weak.

It does not affect the construction progress, and timely investigation and repair are very important. So how do you eliminate the problem after all? Specifically, it can be followed by the following processes.

Check whether the hydraulic oil level is normal, if the oil level is lacking, the oil should be added to the regular position; Then start the motor to observe the vacuum gauge reading.

The number is not normal.

In the shutdown state, turn on the main power supply, press the pumping button, and then observe whether the solenoid valve that controls the pumping is operational. If it is not normal, it should be entered.

One step to determine whether the line is faulty or the solenoid valve coil is damaged or the valve core is stuck. If it is normal, the operation of the hydraulic reversing valve should be checked.

The main cylinder is not active when reversing the direction, so it may be doubtful that the travel switch can be distinguished.

Check the pressure of the main pump system, and if the regular value is not reached, you should look at the relief valve and the main oil pump.

If the temperature of the hydraulic oil is too high, it will cause leakage and addition, the oil pressure will decrease, and the operation will be weak, so the heat dissipation system should be overhauled to ensure heat dissipation.

Outstanding role.

As a kind of concrete transportation thing commonly used by construction units at that time, the concrete pump has been expected by the vast number of construction parties.

It can be considered from electrical, hydraulic and external factors.

Electrically, consider whether there is an emergency stop, whether there is a situation where the solenoid valve coil does not work well, the hydraulic pump has temperature protection, generally more than 90 ° will be shut down, you can check whether the radiator dissipates heat well, observe the temperature displayed on the display screen, more than 60 degrees radiator fan should be automatically turned on. There is also a pressure sensor, if the pressure is too high, the system will think that the pipe is blocked, and the displacement will be reduced, and the external phenomenon is that it is not pumped.

From the hydraulic aspect, whether the pumping main valve or pumping solenoid valve is stuck, resulting in pumping high-pressure oil leakage: the main oil pump can check whether the main oil pump displacement valve has pressure, whether the main pump has high-pressure oil output, and whether the main oil cylinder has pressure holding.

If it is in the state of pumping concrete, you can see if the pipe is blocked, resulting in pressure holding and unable to work.

First find out whether it is caused by the poor workability of concrete, or whether there is a problem with the pump.

It should be that the throttle response speed is not powerful!

It is recommended that you clean the oil pipe and purify the oil circuit! It must be the oil pipe and oil circuit, which are corroded by gasoline and additives all the year round, and the oil sediment accumulates, resulting in poor oil channels and oil pipes, which gives you a feeling of insufficient strength!

The old-fashioned one with a proximity switch has a valve block in the back two cylinders, both of which rotate 90 degrees and then the proximity switch in the water tank is interchanged, and then see if the distribution cylinder is right, if it is reversed, change the distribution solenoid plug, and the new one has automatic high and low pressure switching.

What is going on in the new test of Zoomlion tow pump bottom pressure switching high pressure without reversing.

It's hard for you to explain here, so let's find a manufacturer.

In the process of using many construction machinery and equipment, there may be a variety of problems, sometimes caused by mechanical failures, signal transmission, human factors, etc., requiring operators and maintenance personnel to deal with problems with high speed and high quality, so as not to affect production. The following Zoomlion summarizes several common problems and treatment methods in the use of concrete trailer pumps:

Reduced engine speed: The first thing to do is to test the engine itself, if the engine output is lower than the rated power, it may be poor fuel quality, low fuel pressure, faulty brakes and levers, and turbocharger deposits. If the engine output is normal, it is necessary to see if there is a mismatch between the flow rate of the hydraulic pump and the output power of the engine.

Such faults should start with the electrical system, then check the hydraulic system, and finally check the mechanical transmission system.

Slow working speed: Mainly due to the wear of all parts of the whole machine, the engine power decreases and the hydraulic system leaks. After working for a certain period of time, the hydraulic components inside the pump (cylinder body, plunger, nine-hole plate, etc.) will inevitably produce excessive wear, which will cause internal leakage, and the parameter data will be uncoordinated, resulting in insufficient flow and high oil temperature and slow working speed.

At this time, it is necessary to overhaul the whole machine and repair and replace the parts that are worn out of limit. The Auid (Automatic Idling) technology of the agitator-trailer pump effectively controls fuel consumption and engine wear, and the variable pump control system has higher accuracy and improved efficiency!

The solenoid valve does not work: when the solenoid valve is controlled on the operation panel, the solenoid valve cannot be opened manually or automatically, and the solenoid valve coil or pilot valve or operation button can be replaced; If it cannot be opened manually, when the air outlet on the solenoid valve is exhausted, replace the solenoid valve; If it cannot be opened manually, when the outlet under the solenoid valve is exhausted, check whether the inside of the cylinder, the sealing ring, the piston rod, and the hold-down screw are leaking;

Belt conveyor and cylinder do not work: when the belt is running, the operation of the roller should be checked frequently, and if it is found that it does not rotate, it should be replaced in time, and it cannot be worked with illness, otherwise it will lead to belt scratching; The lubricating oil of the electric drum of the belt conveyor should be checked regularly, added and replaced in time. Dismantle and inspect to remove the sludge inside the cylinder.

In order to prevent equipment failure, it is necessary to pay great attention to the maintenance and maintenance of the concrete trailer pump in the process of daily use, and strictly follow the operating instructions. Mechanical engineering machinery and equipment focus on maintenance rather than solving faults, do not wait for the fault to appear and then solve, as long as the correct operation and maintenance in accordance with the equipment manual, the probability of failure is still very low.