1 Selection of concrete pump 1.1 Classification From the mobility can be divided into automotive concrete pump (pump), frame pump (without active boom), trailing concrete pump. From the power form can be divided into electric and internal combustion engine. From the pump form, currently widely used ramp valve and the "S" pipe valve type; the former has the advantage of the concrete aggregate diameter requirements of the wider (40 mm), the price is lower, the disadvantage is The gate valve needs to be lubricated continuously with a pumping height of about 100 m. The latter has no lubrication system and requires strict aggregate (not more than 33 mm). The pumping height can be up to 150 m and the selling price is generally higher. 1.2 Selection According to work experience, large-scale thermal power plant construction equipment generally equipped with two mixing towers (stations), three concrete pumps, a pump towed pump or two pump one-drop pump, and multiple choice inclined Gate valve to meet the aggregate requirements, so mobility, economy, availability are more reasonable. 1.3 Selection Notes (1) primary election concrete pump, be sure to visit the user, learn more about the actual use. (2) must choose the regular manufacturer mass production of concrete pump. (3) try not to use any manufacturer's first (first batch) concrete pump. (4) Should be signed with the manufacturer sales direct contract to buy, as far as possible through the middle part, in order to facilitate maintenance services. 2 new pump debugging 2.1 debugging at the factory before the pump (1) personnel: technicians, operators, drivers, each one, the operator is a skilled worker. (2) read the instructions carefully. (3) Check whether the concrete pump is consistent with the model number in the contract and whether the certificate number and nameplate number are the same. (4) the appearance is satisfactory, whether there is leakage, leakage at. (5) According to instructions, determine the maximum and minimum displacement of the movement of the piston movement. Such as Hubei Construction Machinery Factory HBT60 pump displacement of 8 ± 1 times / min, the maximum displacement of 28 ± 1 times / min. (6) Check the mixing system, cooling system, lubrication system is normal, the automotive jib pump must also check the boom system, leg system, the car part is normal. (7) empty load operation 2 h, review the system for leaks, seepage, during which the pressure gauge should be normal. (8) Check all the random spare parts are complete, intact. All qualified before receiving. 2.2 on the site for the first time before using the debug content (1) repeated manufacturers to pump debugging content. (2) Concrete pump installation site should be flat and solid, especially the leg support. Concrete pump as close to the construction site, and consider the exit route after the end of the operation. (3) layout and reinforcement of the transmission pipeline (external pipe). (4) empty load operation 10 ~ 20 min, so that the lubrication points are obviously grease. (5) in the displacement of pumping mortar 1 ~ 2 m3, when the mortar fast pump can be poured into the concrete, directly into the normal pumping. Test the pump, carefully observe the various parts of the work without exception. Such as oil pump, oil temperature, the main pressure gauge changes, the frame pump should also pay attention to boom movements and engine work, if any unusual circumstances, should be immediately shut down, find out the reasons for re-examination after troubleshooting. Do not wash the pump after pumping, carefully check the ministries have no leakage, leakage phenomenon, after passing the pump or directly into use. 3 ease of pumping concrete pumping techniques (i.e., pumping effect) depends on the general quality of the concrete itself, pour point distance, the size of the delivery tube, piping as well as to prevent plugging, and remove the like suddenly blocking. (The quality of concrete itself has a great impact on the pumping effect of concrete, but it will not be introduced here.) 3.1 Selection of duct According to Table 1, select the appropriate duct for the maximum particle size of concrete coarse aggregate. 3.2 External pipe layout should be to minimize the use of elbows, pipe wear should be as far as possible away from the concrete pump cloth in the position to avoid excessive pressure burst pipe. Various forms of pipe converted into horizontal length (approximate). 3.3 Exclusion of concrete pump plugging tube (1) anti-pumping once the plugging, you can press the "anti-pump" switch, the general anti-pump run 4 to 5 trips can be ruled out. (2) When the anti-pump operation can not be ruled out pipe plugging, as soon as possible to open the plug at the duct, and remove the blockage. Note that in addition to cutting off the power before demolition, but also to completely eliminate the remaining pressure in the tube. 3.4 season construction Summer hot climate construction, should use wet shroud cloth, straw bag covering duct, so as to avoid the tube of concrete "dehydration", transportation difficulties. Winter cold season construction, should be wrapped with insulating material pipe, to prevent the concrete inside the pipe by the cold. 3.5 Pumping work is completed Notes (1) thoroughly clean the concrete pump and the external pipe. (2) check the random tools. (3) 20min running air to make the lubrication points covered with grease. (4) safe exit from the job site. 4 Routine Maintenance Due to the variety of concrete pumps, here only describes some common maintenance. 4.1 Pre-departure inspection items (1) Booms, slide valves and outrigger should be fully withdrawn and locked. (2) work lights, signal device is working properly. (3) Adequate fuel, grease and wash water. (4) sufficient hydraulic oil, all parts do not leak oil. (5) All kinds of plumbing, tools, appliances and accessories should be complete. (1) Daily inspection 4.2 appearance of the main components of deformation damage inspection cycle, exposed loose parts, operation and performance changes, oil leakage, hose damage, lack of lubrication points grease, car driving insecurity. (2) monthly (or pump concrete 2 000 m3) Check the spool valve damage, duct wear, hydraulic oil reduction, lubrication points forced lubrication, the car routine maintenance. (3) Six months (or 12,000 m3 of concrete pump) Check the lower shell of the slide valve, damage to the conveying cylinder, deterioration of electrical components and hydraulic oil, damage to the boom, and routine overhaul of the vehicle. (4) Check the stirring device, stirring oil motor, rotary oil motor, water pump and oil pump every year (or 24,000 m3 of concrete pump) to change hydraulic oil. (5) Every two years (or 48,000 m3 of concrete pump) Check all items CAUTION Disassemble all seals for replacement, and the automobile part should be overhauled at the designated or professional repair point. 4.3 hydraulic oil and lubricating oil, hydraulic oil selection Model: Winter 32 anti-wear hydraulic oil, non-winter 46 anti-wear hydraulic oil. Sliding valve lubrication: Non-extreme pressure type 000 lithium-based grease winter, non-winter non-extreme pressure type 00 lithium-based grease. Car and the rest of the lubrication: Calcium grease No. 2 or with reference to instructions. 5 5.1 Repair Repair consumable cartridge spool in the range of concrete pumps, many parts in contact with the concrete, are very powerful wear, and we can fix the individual components is limited, the remaining member such as rubber, concrete delivery cylinder, Sliding valve stems and other pieces of fine processing, the general take replacement. Repairable wear parts are divided into two categories: one is the surfacing repair parts, such as the spool valve plate, spool valve cover (also known as the lower slide valve housing), the valve slide valve seat, the mixing valve; One is welding repair, mainly for concrete pipes. 5.2 the valve spool detection wear plate generally a lower wear serious when the size of the wear member after a new dimension by more than 5 mm, i.e. need repair; the spool, an intermediate portion of the seat badly worn, a new member when the size and dimensions of the wear Differences greater than 4 mm