1, installation If the concrete mixing truck feed concrete pump (pump), can be installed locally, as long as it can easily take over and feeding can, if it is on-site mixing concrete supply, first of all should be based on the venue and mixer The feeding method to determine the mixer position, and then according to the mixer discharge height and suitable for pumping and takeover requirements to determine the location of the pump. The installation method is as follows: (1) The pump is first placed on a firm cement floor or stone pier to maintain its level, and the pump 4 legs positioning pin and safety pin locking, the tire off the ground or unloading Tire off. (2) A chute is made between the discharge port of the mixer and the pump hopper, so that the material discharged by the mixer enters the hopper of the pump through the chute. The chute is usually made of angle steel, welded by 1.5mm thick steel plate. Stand below the chute to make it firm. On the chute, the required slope is appropriate, the best angle of inclination of 25 degrees -40 degrees, chute and pump hopper to leave some space between, easy to clean the hopper and sieve. (3) pump installed in place, to ensure that the pump shell door can open, close freely, easy maintenance operation. (4) Under normal circumstances, the pump above the hopper should be increased about 20cm, so you can increase the hopper volume, to ensure that the concrete is not outflow (due to a mandatory mixer best discharge finished material, so that the concrete flow into the hopper More uniform, such as sub-discharge, the last out of the concrete stones too much, on the pump negative, if you are using a large capacity blender, you can do a storage hopper in advance to ensure continuous feeding. 2, pipe layout 1) The piping layout should be shortened as much as possible while reducing the number of bends to ensure smooth delivery and normal delivery (2) It is best to first connect the straight pipe above 2m in front of the conical pipe Then use the elbow, must also ensure that the straight pipe axis coincides with the conical pipe axis, and to be fixed and reliable, so that the cone pipe can be quickly installed after disassembly and cleaning. (4) According to the site construction conditions and the takeover requirements of the takeover, reasonable layout (3) The pipelines shall be firmly connected, fixed fixing devices shall be provided at the pipe elbows, a solid point shall be set for every 10m of horizontal pipelines, and the pipe clamps shall be left floating for easy disassembly Take the pipeline. Each clamp must be fastened in place, to ensure tight seal joints, leaky, leaking. 3, commissioning (1) pump installed in place, the pump should be the first overall inspection, inspection include: fuel tank Within the provisions of the liquid level is within the scope of the hydraulic hose fittings, pipe clamps and other connections seat is loose, with or without oil leakage, the electrical components of the connection is broken or off line, the contact screw is loose, (2) electrical inspection First of all, should check the site voltage is (380 ± 10%) V, the pump must be set up a dedicated control switch, the specifications of the cable used and the pump on the The main cable must be the same, and according to the requirements to connect the ground. Then do the following checks: A, close the control line switch, the power indicator light, PLC PLC module is energized, then observe the instructions on the module Lights (respectively, start, run and fault), if you start, the running light is on; and the fault light is off, then normal, you can carry out normal operation, otherwise not normal, the pump can not run. Start button to see whether the motor contactor according to the program action, the motor indicator light is bright. C, respectively, by pumping, anti-pump, pressure test, stirring button to see whether the programmable logic controller input and output signals. 3) If all the above are normal, the pump can start running A. Pull the air switch of main motor and control line to "on" position, turn on the key or emergency stop switch, if the power light is on, it indicates that the control circuit power is connected B, jog motor start button, let the main motor running 1-2S, and check the main motor steering, (from the motor output shaft should be counterclockwise, that is with the main pump marked the same direction); if the steering No, as long as the two-phase power supply can be exchanged for the total power. C, the machine air run 10min, check the machine for abnormal noise, whether the pipe clamp loose or oil leakage, plate valve pressure reaches the prescribed value. D, open the water tank cover, filled with water to the tank or at least flooded piston rod, water movement will make the shaft seal and concrete piston quickly damaged. E, check whether there is lubricating oil pump, and lubricants as required. F, with a grease gun, respectively, to the distribution valve cylinder and the tank in the middle of the oil rod full of oil. G, pressure test operation 10S, to close the oil circuit and check the main system pressure. H, press the pump button to observe the pump action is normal, start stirring, check its positive and reverse whether the direction of the switch marked (from the motor output shaft, clockwise to positive). I, pumping 10min after the anti-pump operation, and check the positive and negative pump switch with the same direction. Throughout the operation, we should always pay attention to the connection of the various parts of the pump, high-pressure hose and the various instruments, in case of emergency directly stop by the total stop switch, just in case. (4) Concrete. Complete machine no-load debugging can be prepared after the pumping of concrete, but also before the pump to do: Understand the variety and quality of coarse aggregate in concrete and particle size and grading, and the formation of a tight labor organization, a reasonable division of labor , Arrange the contact measures, by hand responsible for monitoring the feeding situation, and ready for a variety of maintenance tools and conveying piping cleaning appliances, ready for night lighting. As the maximum particle size of the coarse aggregate is limited by the minimum working diameter of the pipeline, it is required that the maximum size of the gravel does not exceed 1/4 of the pipe diameter and the pebble does not exceed 1/3 of the pipe diameter. A small amount of the oversized aggregate Mixed, but not more than 2%, and they must be dispersed, the type of fine aggregate, user sand prepared concrete pumpability is best, the average particle size of 0.25-0.3mm, the general sand rate of 38% -45% , For coarse sand, sand requirements in more than 45%, fine sand is better in the 31% -33%, water-cement ratio of pumping concrete to 0.4-0.6 between the general situation with admixture superplasticizer, it Can make the coagulation structure of the slurry into a dispersive structure, thereby improving the fluidity. Concrete slump is generally controlled at 8-23cm, for long-distance and high-altitude pumping generally controlled at 18-20cm, pumping down and greater drop, the general control of 12-14cm. (5) pay attention to the following points when pumping concrete: A, start the concrete pump running air, if the temperature is low, the air running time should be longer, the temperature of the hydraulic oil to be raised to 15 degrees Celsius to pump. B, add a certain amount of water to the hopper to warm the hopper, valve and distribution pipeline. C, Before pumping concrete, the mortar should be pumped 0.5-1m3; part of the mortar must be retained in the hopper (to the axis of the hopper, the next place), until the concrete to join the hopper after pumping together. D, in the process of pumping concrete, pay strict attention to the actual mixing quality of concrete and slump, if the mixing out of the concrete does not meet the pumping requirements, must be removed. E, the hopper should not be filled with concrete online, the network of ultra-fine aggregate and debris to be promptly removed, when the hopper mixing shaft is stuck stuck, to pause the pump, and timely reversal of operation, excluding Failure, the hopper in the concrete can not be too small, in order to prevent pipe blockage caused by suction, when the supply can not keep up, to stop pumping in time. F, the pumping operation to be interrupted for a long time, should stop mixing within the hopper, otherwise it will make the concrete sinking coarse aggregate, once again pumping, should be stirred, to be positive and anti-pump operation for two After the stroke can resume normal pumping. G, in the pumping process, we should always observe the pump on the various instruments of pressure and lubrication, etc., if abnormal, should be promptly removed to ensure the normal pump. 4, pipeline cleaning Before cleaning the pipeline, it is best to pump 0.5-1m3 of mortar, and after all the pump down and then stop, and then pull the plate valve switch, remove the accumulator pressure. There are two ways of pipe cleaning, namely washing and air washing, whether it is washing or air washing, the valve box and the hopper should be cleaned. When washing, you should open the conical tube and clean it, and then will be immersed in water soaked into a cylindrical cement bag and cleaning the ball will have been cleaned into the conical tube, and then back to the cone and pipe, closed Unloading the bucket door, and then filled with water to the hopper (to keep the water constantly); pump water until the cleaning ball pops up from the front of the delivery pipe. Washing, requiring cutting ring and the eye plate (butterfly valve pump is a plate valve and tie rod and up and down wear-resistant film) to the gap is small, there must be a lot of water, sealed, so clean the ball after the water does not penetrate . At the end of the washing soon, pay attention to the water in the pipeline, do not flow to the pouring point of concrete, by the impact of free concrete quality. This method is simple, less dangerous, more commonly used. Air wash, that is, with compressed air purge, it is soaked in water cleaning ball first plug into the air wash, and then connected with the reduction of the first straight pipe, and the end of the pipe connected to the safety cover, (The hole in the safety cap must face downwards). Air wash, to control the pressure of compressed air does not exceed 0.8MPa; valve to be slowly opened when the concrete can flow out smoothly before opening the atmosphere valve; gas wash is completed, immediately close the valve. Air washing need to be equipped with air compressors, to be strictly in accordance with the provisions of the operation requirements of pipeline sealing, but the air wash can not wash a long pipeline, the long-distance pipeline should be segmented cleaning, this method of operation to be cautious, More dangerous, so the construction workers should be away from the exit direction to prevent the ball or cleaning the ball flew wounding.
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