At present, helium pump has been widely used in the construction of concrete. The helium pump used is mainly a two-cylinder driven helium pump, which is generally entangled in the moment of pumping commutation. This kind of shut-off phenomenon has two major hazards. One is that it is easy to cause cockroach segregation, and some of the cockroaches are dehydrated into dry hard cockroaches to cause blockage, especially when pumping low slumps. Second, commutation transients And the release pressure in the distribution valve causes an impact on the hydraulic system of the pump, causing damage to certain components and increasing energy loss. The damage is obvious when the flow is pumped vertically upwards, especially at a height of more than 50 m.
1, the cause analysis
The pump is a full liquid control pump, and the constant power main oil pump supplies oil to the main cylinders 10-1, 10-2 and the distribution valve cylinder 9 through the hydraulic valves 8-1, 8-2. The main cylinder cartridge valve and the distribution valve cylinder respectively send signals to control the hydraulic valve reversal, so that the action sequence of the main cylinder and the distribution valve cylinder are coordinated with each other to realize the ç ¼ pumping cycle, wherein the main cylinder 10 double cylinder alternately sucks and drains Achieve continuous pumping of helium. During each commutation, turbulence usually shows a significant flow-break-flow phenomenon, commonly known as a shut-off phenomenon.
1-motor; 2-tank; 3-main oil pump; 4-back oil filter; 5-air filter; 6-relief valve; 7-pressure gauge; 8-hydraulic valve; 9-distribution valve cylinder ;10-main cylinder
There are three reasons for the turbulence phenomenon: 1 When the main cylinder runs to the end of the stroke, the commutation signal is sent to the reversing cylinder for reversing, and then the main system oil passage is reversed, and the main cylinder 10 moves in the opposite direction. This process requires at least 0.2. s; 2 ç ¼ is inhaled ç ¼ cylinder inhalation efficiency is usually only 85% to 95%, inevitably inhaled a small amount of air in foreign countries, especially in Europe and the United States due to the use of pump trucks, large displacement, ç ¼ aggregate and grading control It is relatively strict, the scale and height of the building are small, and the problem of cut-off and hazard is not obvious. However, the domestically used tow pump generally has a displacement of less than 80m3/h, and the scale and height of the building are large, and the phenomenon of current interruption is obvious. Through the selection and setting of the control mode of the main oil pump, the problem of interrupted flow of the helium transport can be effectively solved, the commutation shock is reduced, and the pumping performance of the helium pump is greatly improved.
1, the cause analysis
The pump is a full liquid control pump, and the constant power main oil pump supplies oil to the main cylinders 10-1, 10-2 and the distribution valve cylinder 9 through the hydraulic valves 8-1, 8-2. The main cylinder cartridge valve and the distribution valve cylinder respectively send signals to control the hydraulic valve reversal, so that the action sequence of the main cylinder and the distribution valve cylinder are coordinated with each other to realize the ç ¼ pumping cycle, wherein the main cylinder 10 double cylinder alternately sucks and drains Achieve continuous pumping of helium. During each commutation, turbulence usually shows a significant flow-break-flow phenomenon, commonly known as a shut-off phenomenon.
1-motor; 2-tank; 3-main oil pump; 4-back oil filter; 5-air filter; 6-relief valve; 7-pressure gauge; 8-hydraulic valve; 9-distribution valve cylinder ;10-main cylinder
There are three reasons for the turbulence phenomenon: 1 When the main cylinder runs to the end of the stroke, the commutation signal is sent to the reversing cylinder for reversing, and then the main system oil passage is reversed, and the main cylinder 10 moves in the opposite direction. This process requires at least 0.2. s; 2 ç ¼ is inhaled ç ¼ cylinder inhalation efficiency is usually only 85% to 95%, inevitably inhaled a small amount of air in foreign countries, especially in Europe and the United States due to the use of pump trucks, large displacement, ç ¼ aggregate and grading control It is relatively strict, the scale and height of the building are small, and the problem of cut-off and hazard is not obvious. However, the domestically used tow pump generally has a displacement of less than 80m3/h, and the scale and height of the building are large, and the phenomenon of current interruption is obvious. Through the selection and setting of the control mode of the main oil pump, the problem of interrupted flow of the helium transport can be effectively solved, the commutation shock is reduced, and the pumping performance of the helium pump is greatly improved.
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