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The S pipe is the most important component of the concrete pump truck distribution system. Its main function is to connect the boom pipe of the pump truck with the concrete delivery cylinder to achieve continuous pumping of concrete. When working, the swing cylinder located behind the hopper will control the S-pipe to swing left and right, thereby achieving synchronization with the delivery cylinder.
When the pump is forward, the S-pipe inlet will be connected to the discharge port of the conveying cylinder on the discharge end; when the pump is reverse, the S-pipe inlet will be connected to the discharge port of the conveying cylinder on the suction end. In normal operation, this process is fully automatic. At the same time, a cutting ring will be installed at the end of the S tube inlet, which will protect the S tube. At the same time, the internal rubber spring can also act as a buffer.
The most common problem when the S pipe is working is that it does not swing in place, which will cause the S pipe and the conveying cylinder to be incompletely connected, causing the concrete to have poor material absorption. In severe cases, it will directly lead to pipe blockage. Today we are going to talk about what causes the S-tube to not swing in place?
Reasons why the S tube does not swing in place:
1. The fluidity of the concrete in the hopper is too poor. When the S pipe swings, the resistance to the S pipe is large, causing it to not swing in place.
2. There is foreign matter in the hopper, which limits the displacement of the S tube and prevents it from swinging to the normal working position.
3. The S-tube small-end bearing seat and the S-tube small-end gear are not tightly meshed, or are severely worn, causing the working gap to be too large, causing the S-tube to not swing in place.
4. The S-tube swing cylinder is controlled by the pressure oil of the constant pressure pump, which may be caused by insufficient pressure of the constant pressure pump.
5. At the moment of reversal, the S tube needs an accumulator to increase its instantaneous reversing pressure. If there is a problem with the accumulator and the instantaneous reversing pressure is not enough, it may also cause it to not swing in place.
6. If normal pumping and manual jogging cannot swing in place, it may be that the spool of the hydraulic valve that controls the swing cylinder is stuck, causing the swing cylinder to not receive normal reversing pressure and flow. In this case, the swing cylinder The cylinder may also not swing in place.
7. If one side can swing in place and the other side cannot swing in place, you should consider whether the valve cores of the electromagnetic reversing valve and the hydraulic reversing valve are stuck on one side, or whether there is a problem at one end of the electromagnetic reversing valve. The magnetic force of the coil is not enough. This may be caused by a virtual connection or a short circuit at the coil connector.
Processing steps and methods:
First, when the hopper is empty, start pumping to see if the S pipe can swing into place. If it can swing in place at this time, the failure of the S pipe to swing in place is caused by reasons 1 and 2 above. The solution is to increase the slump of the concrete. At the same time, when working, just be careful not to let foreign objects enter the hopper.
A normally working S-tube will make a "bang" sound when the direction is changed for a moment. If the S-tube swings with obvious jitter when the pump is empty, or the S-tube is in place at the moment of reversal, but it is not in place at the back, It is caused by reason 3 above. The teeth of the small end and the S tube are not tightly meshed, and the small end needs to be replaced.
After completing the above two inspections, if the S-tube still does not swing in place, you need to find problems with the electrical and hydraulic systems.
There is only one solenoid reversing valve in the entire control loop, so directly check whether the voltage of the coil connectors at both ends of the solenoid reversing valve is normal, or consider whether the coil is short-circuited. At the same time, you can use a screwdriver to push the valve core of the electromagnetic reversing valve to see if the S pipe is working properly and determine whether the valve core is stuck.
For problems with the accumulator, you can push the charging port to see if there is pressure gas, or directly measure the pressure of the accumulator bladder to determine whether the pressure is insufficient. (Normal accumulator bladder pressure value is about 8Mpa)
So, if the above inspections are completed and the problem still exists, then it is necessary to consider whether the constant pressure pump is the cause. The constant pressure pump is a swash plate type axial piston pump. The constant pressure pump may not be able to output normal working pressure due to wear of the plunger slipper.
Please feel free to contactus Parts Sea engineers or sales for help if you have no parts No.
tse@partssea.com | sales@partssea.com
The S pipe is the most important component of the concrete pump truck distribution system. Its main function is to connect the boom pipe of the pump truck with the concrete delivery cylinder to achieve continuous pumping of concrete. When working, the swing cylinder located behind the hopper will control the S-pipe to swing left and right, thereby achieving synchronization with the delivery cylinder.
When the pump is forward, the S-pipe inlet will be connected to the discharge port of the conveying cylinder on the discharge end; when the pump is reverse, the S-pipe inlet will be connected to the discharge port of the conveying cylinder on the suction end. In normal operation, this process is fully automatic. At the same time, a cutting ring will be installed at the end of the S tube inlet, which will protect the S tube. At the same time, the internal rubber spring can also act as a buffer.
The most common problem when the S pipe is working is that it does not swing in place, which will cause the S pipe and the conveying cylinder to be incompletely connected, causing the concrete to have poor material absorption. In severe cases, it will directly lead to pipe blockage. Today we are going to talk about what causes the S-tube to not swing in place?
Reasons why the S tube does not swing in place:
1. The fluidity of the concrete in the hopper is too poor. When the S pipe swings, the resistance to the S pipe is large, causing it to not swing in place.
2. There is foreign matter in the hopper, which limits the displacement of the S tube and prevents it from swinging to the normal working position.
3. The S-tube small-end bearing seat and the S-tube small-end gear are not tightly meshed, or are severely worn, causing the working gap to be too large, causing the S-tube to not swing in place.
4. The S-tube swing cylinder is controlled by the pressure oil of the constant pressure pump, which may be caused by insufficient pressure of the constant pressure pump.
5. At the moment of reversal, the S tube needs an accumulator to increase its instantaneous reversing pressure. If there is a problem with the accumulator and the instantaneous reversing pressure is not enough, it may also cause it to not swing in place.
6. If normal pumping and manual jogging cannot swing in place, it may be that the spool of the hydraulic valve that controls the swing cylinder is stuck, causing the swing cylinder to not receive normal reversing pressure and flow. In this case, the swing cylinder The cylinder may also not swing in place.
7. If one side can swing in place and the other side cannot swing in place, you should consider whether the valve cores of the electromagnetic reversing valve and the hydraulic reversing valve are stuck on one side, or whether there is a problem at one end of the electromagnetic reversing valve. The magnetic force of the coil is not enough. This may be caused by a virtual connection or a short circuit at the coil connector.
Processing steps and methods:
First, when the hopper is empty, start pumping to see if the S pipe can swing into place. If it can swing in place at this time, the failure of the S pipe to swing in place is caused by reasons 1 and 2 above. The solution is to increase the slump of the concrete. At the same time, when working, just be careful not to let foreign objects enter the hopper.
A normally working S-tube will make a "bang" sound when the direction is changed for a moment. If the S-tube swings with obvious jitter when the pump is empty, or the S-tube is in place at the moment of reversal, but it is not in place at the back, It is caused by reason 3 above. The teeth of the small end and the S tube are not tightly meshed, and the small end needs to be replaced.
After completing the above two inspections, if the S-tube still does not swing in place, you need to find problems with the electrical and hydraulic systems.
There is only one solenoid reversing valve in the entire control loop, so directly check whether the voltage of the coil connectors at both ends of the solenoid reversing valve is normal, or consider whether the coil is short-circuited. At the same time, you can use a screwdriver to push the valve core of the electromagnetic reversing valve to see if the S pipe is working properly and determine whether the valve core is stuck.
For problems with the accumulator, you can push the charging port to see if there is pressure gas, or directly measure the pressure of the accumulator bladder to determine whether the pressure is insufficient. (Normal accumulator bladder pressure value is about 8Mpa)
So, if the above inspections are completed and the problem still exists, then it is necessary to consider whether the constant pressure pump is the cause. The constant pressure pump is a swash plate type axial piston pump. The constant pressure pump may not be able to output normal working pressure due to wear of the plunger slipper.