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Home > News > Industry News > Harmfulness and Solution to Ex.....

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Harmfulness and Solution to Excessive Impact of Pumping Cylinder of Concrete Pump Truck

  • Author:Chang Jie
  • Release on :2017-01-16

Small concrete pump truck in the course of operation, if the impact of the pump cylinder is too large, can produce the following five kinds of hazards: First, causing the pump boom jitter, affecting its life; the second end of the boom to put the boom Increase the number of easy to bruise the operator; third is likely to cause the main pump suction air, affecting its service life; Fourth, increase power loss, fuel consumption increased; Fifth, the noise increases, to the environment influences. Therefore, it is necessary to study the reduction of the impact force of the pump cylinder from the hydraulic system and the pump cylinder.
 
1. Pumping cylinder works
Concrete pump truck hydraulic system, A, B ports are connected to two pumping cylinder into the oil chamber, the main pump alternately from the A, B port for two pumping cylinder delivery of high-pressure oil.
The right pump cylinder rod cavity into the high-pressure oil to drive the piston rod retracts, the right pump cylinder rodless pressure oil through the high pressure tubing into the left pump cylinder rodless cavity, driving the left pump cylinder piston rod extension Out. When the proximity switch senses the right pump cylinder piston rod in place, the control system sends a commutation signal. The main pump receives the commutation signal, the left pumping cylinder rod cavity pressure oil connected to the left pumping cylinder piston rod retracted. The left pump cylinder rodless pressure oil, through the high pressure tubing into the right pump cylinder rodless cavity, drive the right pump cylinder piston rod out. 2 pump cylinder so alternating action, can complete the concrete pumping work.
When the pump cylinder rod cavity into the pressure oil and the piston rod will move to the end of the rodless cavity, the rod cavity oil pressure higher than the rodless cavity, a rod cavity pressure oil through the pump cylinder on the hole, One-way valve, damping hole to the rod-free cavity fill, can stop the piston rod as soon as possible.
On the contrary, when the main pump is connected with two pump cylinder rodless chambers respectively, two pumping cylinders are connected with rod ports A and B. At this time, the rodless cavity oil pressure is lower than the rod cavity, and the rodless pressure oil can not fill the rod cavity by the small hole of the pumping cylinder.

2. Pumping cylinder for the impact test
Based on the above principle analysis, we designed the following four impact test program:
First, the pump cylinder set on the three diameter of 1.5m m orifice in the hydraulic system is not installed S N valve (that is, the main pump servo cylinder installed on both sides of the one-way valve). At this point measured when the pump cylinder for the impact of the pressure of 24MPa, low-pressure side suction time of 100ms.
Second, in the pump cylinder set on the three diameter of 1.5mm damping hole in the hydraulic system installed SN valve. At this point measured when the pump cylinder for the impact of the pressure of 14MPa, low-pressure side suction time of 70ms.
Third, the pump cylinder on the three diameter of 1.5mm damping hole to a diameter of 2mm damping hole. At this point measured for the impact pressure pump cylinder 9MPa, the main pump low side pressure is greater than zero, the main pump does not suck empty.
 Fourth, the pump cylinder on the three diameter of 1.5mm damping hole to a diameter of 1mm damping hole. At this time measured when the impact of the pressure to 7MPa. Close the pump cylinder buffer device, the pump cylinder for almost no impact when the reversing and suction.

3. Improvement measures of concrete pump truck
According to the above test results, take the following three improvements: First, increase the pumping system in the SN valve to reduce the system impact pressure to reduce the phenomenon of the main pump suction; the second is to reduce the pumping cylinder damping hole diameter , In order to reduce the impact of the pump cylinder to produce the commutation; Third, the use of pumping cylinder rodless chamber into the oil method to further reduce the impact of the pump cylinder for commutation.

After taking these three improvement measures, the impact of the pump cylinder to significantly reduce the impact.