1, installation

If the concrete mixing truck feed concrete pump (pump), can be installed on site, as long as it can easily take over and feeding can be, if it is on-site mixing concrete feeding, first of all should be based on the venue and mixer feeding Way 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) First, place the pump on a firm concrete floor or stone pier to keep it horizontal and lock the positioning pins and safety pins of the 4 legs of the pump to release the tire from the ground or remove the tire.

(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 concrete stones too much, on the pump negative, if you are using a large capacity blender, you can make a storage hopper in advance to ensure continuous feeding.

2, piping layout

(1) Piping layout should be to ensure smooth pumping and normal delivery under the premise of minimizing its length, and reduce the elbow to reduce the transmission resistance.

(2) It is better to connect the straight pipe above 2m in front of the conical pipe and then use the elbows, and also ensure that the straight pipe axis coincides with the conic pipe axis and be fixed and reliable so that the conical pipe can be quickly installed after disassembly and cleaning Back

(4) According to the on-site construction conditions and take over the takeover requirements, reasonable layout of the pipeline to eliminate hidden dangers.

(3) Each pipe shall be firmly connected. A fixed fixing device shall be provided at the bend pipe. A tight point shall be set every 10m for the horizontal pipelines. The pipe clamps shall be left floating for easy disassembly and connection of the pipelines. The clamps must be fastened in place to ensure tight seal joints, no leakage, leakage.

3, debugging

(1) Pump installed in place, the pump should be the first overall inspection, inspection includes: the level of the tank is within the specified range, the hydraulic hose fittings, pipe clamps and other connections are loose seats, there are No oil leakage, the electrical components of the connection is broken or off line, the contact screw is loose, the hopper whether there are foreign bodies or impurities.

(2) electrical inspection. First of all, check if the on-site voltage is (380 ± 10%) V, and set a special control switch for the pump. The specifications of the used cables should be the same as the main cables on the pump, and ground the cables as required. Then do the following check:

A, close the control line switch, the power indicator light, and PLC PLC module is energized, then observe the module on the indicator (respectively, start, run and fault), if you start, running lights; and fault lights Off, then normal, you can carry out normal operation, otherwise not normal, the pump can not operate.

B, press the motor start button to see whether the motor AC contactor action according to the program, the motor indicator light is on.

C, respectively, by pumping, anti-pump, pressure test, stirring button to see whether the programmable logic controller input and output signals.
(3) If everything is normal, the pump can start running

A, the main motor and control circuit of the air switch to "close" position. Open the key or emergency stop switch, such as power indicator light, indicating that the control circuit power has been connected.

B, jog motor start button, so that 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 rotation consistent); if the steering is wrong, As long as any exchange of two-phase power supply can be.

C, the machine empty run 10min, check the machine for any abnormal noise, whether the pipe clamp loose or oil spills, board valve pressure reaches the required 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 run 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, pipe cleaning

Before cleaning the pipeline, it is best to pump 0.5-1m3 of mortar, and then stop after all the pumping, 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, 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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