马鞍山附近想过夜电话联系

Hello, welcome to visit the great wall construction machinery concrete mixing station equipment price network!

Online consultation | About us | contact us | Website map
Hotline: 0371-65861528


Current position: home page > News Center > What's new >

Cleaning and maintenance of equipment for concrete mixing plant

Author: admin Release time: June 19, 2017 Number of visits:

1、 Cleaning of equipment

When the production is finished, the mixing machine should be cleaned. The precondition of washing machine is that the console is powered on, the air compressor and the host machine are turned on, and the system works in manual mode. Press the washing machine button on the operation console, and the washing machine button will be self-locking. At this time, the system will automatically stop the transmission belt, open the water inlet solenoid valve and discharge solenoid valve of the water weighing bucket, start the drainage motor, and the concrete mixer starts to water in. After a period of time, the discharge door of the concrete mixer will automatically open to drain water. When the washing machine is finished, release the washing machine button. At this time, the water inlet valve of the water weighing bucket will close automatically. After a few seconds, the discharge door and drainage motor of the water weighing bucket will close automatically.

2、 Daily inspection

1. Check the working condition of the lubricating points of each rotating part every day and replenish the lubricating oil in time.

2. Check the amount of lubricating oil in the lubricating oil cup of the concrete mixer every day and replenish the lubricating oil in time.

3. Check the oil level of the oil mist eliminator on the air system once a week, and use lubricating oil with viscosity of 2.5-70e.

4. Open the drain valve once a day before starting and after shutdown to discharge the condensed water from the air compressor and air storage tank.

5. Fasteners (such as bolts and nuts) should be checked weekly to see if they are loose. If any, they must be tightened in time, especially some parts subject to variable amplitude load.

6. Check whether the equipment of water supply, gas supply and additive system is normal every day.

7. Check whether the instrument and electrical system are normal every day.

8. Check whether the mixing shaft and cylinder of the concrete mixer are clean every day. If there is too much concrete on the mixing shaft, it must be cleaned manually.

9. Clean the dust filter or replace the filter every half a year.

10. If the shutdown time is more than one week, the materials (such as cement, water, additives and various aggregates) in each metering hopper must be emptied, and the mixing machine and discharge hopper should be cleaned to avoid material hardening.

Note: when cleaning the filter screen in the dust remover of the powder tank, do not wash it with water, but only use air blowing or soft bristle brush.

3、 Replacement of wearing parts

1. Mixing blades and liners

The mixing blade and lining plate are made of wear-resistant cast iron, and the service life is generally 50000 to 60000 cans. Please replace the accessories according to the maintenance manual.

2. Conveyor belt

Due to the bad load and service conditions, the conveyor belt is easy to be aged or damaged. If the production is affected, it needs to be replaced.

3. Sealing strip of discharge door of main engine

After the sealing strip of the discharge door of the host machine is worn, the upward movement compensation of the discharge door can be adjusted. If the adjusting discharge gate bucket can not compress the sealing strip and solve the leakage problems such as slurry leakage, the sealing strip is seriously worn and must be replaced. If the dust removal effect is still not good after cleaning the filter element, the filter element in the dust remover must be replaced.

4、 Use and maintenance of air compressor

1. Instructions for use

Air compressor is through the piston in the cylinder up and down to achieve air compression. During the descending stroke of the piston, air is drawn through the intake valve, and the exhaust valve remains closed. In the rising stroke of the piston, the air is compressed, the intake valve is closed, the compressed air opens the exhaust valve, and enters the air storage tank through the one-way valve. At this time, the compressed air can not be used until the air compressor increases the pressure of the air tank to the required pressure. The inlet of the air intake filter must be kept clean to prevent possible reduction of air supply due to blockage.

2. Maintenance

(1) Clean air intake filter

(2) Cleaning of valve plate

The cylinder head must be removed before the valve components can be removed. Before removing any connecting pipes or loosening cylinder head bolts, make sure that all air pressure has been vented from the compressor. The disassembly sequence is as follows: remove the eight cylinder head bolts, lift the cylinder head and valve components from the cylinder; loosen and remove the nuts and bolts on the gas valve components; remove the valve plate locator, inlet valve plate and exhaust valve plate, and clean the locating plate, valve plate and valve plate; add new gasket and install them in the reverse order.

6、 Maintenance of double horizontal main engine

1. Use requirements of raw materials

This machine is suitable for powder and granular inert materials, the particle size should not be greater than 150 mm, in which the medium of 120-150 mm does not exceed 12% of the total capacity.

remarks:

Usage limitation: it is not suitable for the stagnant material with volume more than 150 mm and the adhesive medium such as soil whose quantity is more than 12% and humidity is close to 15%. If the semi dry concrete mixture is adhered to the mixing shaft, the diameter of the mixing shaft will increase and the mixing efficiency of the mixing arm will be reduced. Therefore, the mixing shaft must be kept clean.

2. Cleaning of concrete mixer

The concrete should be cleaned at least once within 2 hours. Every day after the completion of the material, the concrete mixer should be fully cleaned up. In the process of washing with water, about 500kg gravel can be mixed to make it cleaner.

3. Lubrication of concrete mixer

(1) Recommended lubricating oil for reducer of concrete mixer: Mobil gear 629 (Mobil) or Omala oil 150 (shell), with oil consumption of 16 L.

(2) Oil change period of lubricating oil in reducer of concrete mixer

The lubricating oil needs to be changed every 50 hours. After that, replace the lubricating oil of the reducer every 1000 hours or less half a year. I need to pay attention to a change of oil. After the oil is discharged, add about 2 liters of lubricating oil to clean the gearbox. In the later oil change process, if the brand has changed, the gearbox should also be cleaned with lubricating oil.

(3) The recommended grade of lubricating oil for hydraulic system: dat25 (Mobil) or Tellus S46 (shell), the oil consumption is 10 liters, and it should be changed every 2000 hours or less a year.

(4) Lubricating oil pump (lubricating oil pump mainly supplies oil to shaft head seal): nlgi0 grease is used in winter and nlgi1 grease is used in summer. It is necessary to add oil from the oil inlet filter. It is strictly forbidden to open the upper cover of the oil pump to add oil.

(5) Lubrication parts: spindle bearing, discharge door bearing, motor bottom plate rotating shaft, motor bottom plate strut shaft, hydraulic cylinder shaft.

4. Sealing of mixer

(1) Shaft end seal: the quality of shaft end seal directly determines the service efficiency and service life of concrete mixer. Automatic shaft head sealing and lubrication system can improve sealing effect and service life. The air pressure shaft head protection device ensures that the concrete mixer works more stably and reliably.

(2) How to check whether the lubricating grease really reaches the shaft head of the main engine for the automatic shaft head sealing lubrication system.

The method is as follows:

Check the indication of oil pressure gauge (10 ~ 60bar): if the indication of oil pressure gauge is lower than 10bar, the valve core is blocked; if the indication of oil pressure gauge is higher than 60bar, the diversion valve core is blocked.

Check the grease consumption (≥ 42ml / h). That is, 1 / 4 of the whole tank is consumed every day. If the consumption is lower than this consumption, it is necessary to check whether the lubricating oil is delivered to the four shaft heads. The method is as follows: one spare grease fitting is installed at the four shaft ends, and the ball core of the grease fitting can be pressed with the nail. If grease comes out from the ball core, the lubricating oil pump is normal.

If the shaft head is short of oil, first check whether the oil pipe at the shaft head is unblocked, then check whether the diverter valve is blocked, and then check whether the pump core is supplied normally. If the fault can not be shut down for treatment, grease should be added from the shaft end grease fitting with grease gun at least twice a day.

(3) Air pressure shaft head protection device: adjust the pressure of pressure reducing valve to 1 ~ 1.5bar. Check the pressure (0.2 ~ 0.5bar) after the air pressure solenoid valve is energized. When feeding, the air pressure solenoid valve is powered on. When discharging, the air pressure solenoid valve loses power. Clearance adjustment between liner plate and blade: measure the clearance between blade and cylinder block, and the normal working clearance is 3-8mm. The adjusting torque of blade bolt is 200nm. After adjusting the clearance, check the bolt tightness again after several working cycles.

(4) Other daily inspection items

Bolt tightness:

After working for one week, check the tightness of the blade, mixing arm and lining plate bolts. After working for 2000h, the tightness of coupling bolts of pulley and coupling must be checked.

Tightening torque of bolts:

Mixing arm 420nm; blade 200nm; liner 100nm; pulley more than 1 nm; coupling 100nm; shaft head 450nm.

Wear degree of wearing parts:

When the wear degree of mixing arm reaches 50%, the lining plate thickness is less than 3 mm, and the blade is replaced when the blade clearance cannot be adjusted.

Check and adjust the tension of the drive belt:

Check the belt tension.

Remove the flywheel cover;

Check whether all belts are in good condition and whether there is derailment aging;

Note: if one or more belts are aged, they must be replaced immediately.

When the belt pressure is 100N (10kg), the pressure point is in the middle of the two pulleys, and the deformation of the belt along this direction is not more than 20mm.

7、 Belt conveyor maintenance and maintenance content

1. Maintenance of transmission device (electric drum or reducer)

Lubricating oil should be added before use. The grade of lubricating oil is l-kc100150 medium load extreme pressure industrial gear oil. The control method of oil quantity is: add lubricating oil to the height required by the instruction manual.

2. Lubrication of roller bearing

Roller bearing is UCP series (commonly used ucp214), which is lubricated with grease and lubricated once a day.

3. Cleaning of rollers and idlers

Too much material will be accumulated on the belt.

4. Maintenance of sand scraping device

Regularly check the abrasion degree of the sand scraping device, and replace it in time when it is worn to a certain extent.

5. Replacement of rubber rib

Rubber flange is seriously worn and should be replaced in time when material is spilled out.

6. Adjustment method of belt conveyor deviation

Method 1: adjust the roller (reorientation roller and tension roller)

Method 2: adjust the idler (groove upper idler and parallel lower idler)

7. Prevention and treatment of interface fracture and transverse tear

Causes: unqualified vulcanization treatment of the joint; (instantaneous) excessive impact load, the weak part fractured under the influence of alternating stress; the interface direction is not suitable for the belt movement direction; long-term use, fatigue damage.

Hazard: serious damage to the belt.

Prevention and solution: reduce the load as much as possible, especially for the belt with counterweight tensioning device, the counterweight should be controlled within 200kg ~ 0kg, so as not to slip in rainy season; strengthen patrol inspection to prevent foreign matters from blocking the belt and scratching the belt; strengthen the training of belt assembly personnel to prevent the belt interface from being installed in the opposite direction.

8. Prevention and treatment of surface degumming

Causes: wear caused by relative movement between belt and idler; wear caused by relative movement between sweeper and belt; unqualified vulcanization treatment of rubber layer; impact wear of materials (especially materials with larger size) on belt.

Hazard: the belt becomes thinner and the strength is lower.

Prevention and solution: strengthen inspection, early detection, early treatment.

9. Prevention and treatment of longitudinal tear

Reasons: there are foreign matters such as round steel and angle steel mixed in the materials. These foreign matters often have sharp edges and are easy to prick the belt. If it is stuck somewhere, it will cause top pressure and continuous scratching on the belt surface. The more the belt is stuck, the more the pressure is, the greater the pressure will be. The belt will be torn longitudinally along the moving direction of the belt; the roller will be excessively worn or even perforated, and the rolled up edges and corners will be cut The belt is damaged; the trough idler is composed of three rollers, and there is a small gap between each idler. If the idler is stuck, it is possible to clip gravel and other sharp angle foreign matters between the gaps. If it is not removed in time, the belt will be scratched; human error operation, the operator will damage the belt when cleaning the belt.

Hazard: seriously damage the belt; scatter material.

Prevention and solution: the user must require the material supplier to strictly control the size of the material; in addition, strengthen the maintenance of the grid screen of the batching station, and repair the damage in time; if the belt is used by the customer, the material supplier must be required to remove iron from the material or the customer should carry out the iron removal treatment by himself; more inspections should be conducted to find out the problems as soon as possible and deal with them in time, and strengthen the maintenance is the key The repair of the belt can be repaired by cold bonding, and how to deal with it better should be done by professionals.

The operation of the belt is strictly prohibited.

8、 Maintenance of powder tank

1. Safety operation specification for powder pumping

When pumping powder, the dust collector on the top of the tank should be opened to remove dust for 1-2 min. After the powder is pumped, it is necessary to open the top dust collector to remove dust for 1-2 min. The filter element of the dust remover shall be cleaned or replaced in time if it is blocked or damaged. Check whether the safety valve on the top of the hopper is invalid.

2. Prevention and treatment of ash emission on top of powder tank

Cause: the filter element of the dust remover is blocked. When the powder is pumped, the pressure in the powder tank will rise. If it is increased to the adjustment pressure of the safety pressure valve on the top of the tank, the safety valve will open, and the ash gas will escape from the safety valve, resulting in ash emission from the top of the tank.

Prevention and solution: before the powder is pumped, start the shaker of the dust remover on the top of the tank for 1-2min to vibrate the accumulated dust on the filter element of the dust remover. After pumping, the dust collector on the top of the tank shall be opened again for 1-2min to vibrate the accumulated dust. In addition, the filter element and safety valve of dust remover should be cleaned regularly.

3. Prevention and treatment of ash return in conveying pipe

Phenomenon: after the bulk carrier finished feeding to the powder tank, the powder returned to the ground from the powder tank conveying pipe after removing the conveying joint, which polluted the environment and caused waste.

Cause: the filter element of the dust collector on the top of the bin is blocked. During the feeding stage, a certain positive pressure is formed in the powder tank. After the ash feeding pipe is removed, a floating part of the powder is formed and returned along the conveying pipe; the feeding level meter is damaged, resulting in the feeding amount exceeding the outlet of the conveying pipe. After removing the ash feeding pipe, a part of the excess powder material returns along the conveying pipe.

Prevention and solution: clean the filter element of the dust collector on the top of the bin; check and repair the loading level meter.

4. Prevention and treatment of ash leakage in conveying pipe

Cause: the pipe coating is scoured and worn by materials, and the turning point is easier to wear through.

Prevention and solution: frequently check the elbow and other easily worn parts. If excessive wear is found, it is necessary to replace the accessories or weld the worn parts.

5. Prevention of paint falling off

Fault phenomenon: paint blistering / falling off / rust on the surface of powder bin.

Causes: poor paint quality; incomplete surface treatment; surface temperature not in accordance with the national standard above the ambient air dew point temperature of more than 3 ° C, resulting in rough appearance of paint coating (orange peel / uneven light color / flowery face, etc.), poor mechanical strength (impact / elasticity / hardness / adhesion, etc.), poor weather resistance (sun / rain, etc.), poor acid and alkali resistance, etc; The use environment has acid and alkali erosion.

The surface treatment of steel before and after coating shall be strictly in accordance with gb-188-1.

6. Prevention and treatment of powder silo roof fall

Fault phenomenon: the connection between the dust collector and the powder bin is torn and the dust collector falls from the top of the powder bin.

Fault reason: when feeding, the filter element of the dust collector is blocked and the pressure safety valve fails. The pressure in the bin increases, and the weak part of the top of the bin deforms or destroys due to high pressure.

Prevention and solution: regular maintenance and maintenance of dust collector and pressure safety valve and other accessories.

7. Prevention and treatment of malfunction of level gauge in powder bin

Cause: generally, the level gauge itself will not fail. The main reason is that there is cement caking on the rotating blade of the level gauge. The causes of caking include: water leakage from the top or wall of the bin, causing cement to agglomerate on the blade, blocking the rotating blade of the level gauge.

Prevention and solution: check the sealing condition of powder bin frequently. In case of failure, the mounting bolts of the level gauge can be disassembled to remove the caking and remove the level gauge to confirm whether the level gauge operates normally. Check the material level and timing, pay attention to safety. After the operation is normal, install the material level meter. When timing the loading level, the sealing tape must be added at the bolt position.

9、 Maintenance of screw conveyor

The screw feeder should be emptied every day after operation. Check the operation, sealing and lubrication of the gearbox once a week. There should be no abnormal noise, oil leakage and other phenomena. If the oil quantity is insufficient, it should be replenished in time, but it should not exceed the oil level line. Once a week, check the outlet and hanging bearing for sediment, if any, remove it to avoid blockage. Check the fastening condition of the whole machine once a month. It is forbidden to mix hard bulk materials or foreign matters into the conveying materials. After the gearbox has been running for 100h, it needs to be replaced with new lubricating oil, and then every 1000h. Mobil gear629 or shell 150 is recommended for gearbox lubricating oil.

10、 Maintenance of metering system

1. All soft connected red hose and bellows in weighing bucket are not subject to tension in natural state, otherwise weighing accuracy will be affected.

2. After the sensor is installed, it can only bear positive pressure (for cantilever or pressure sensor) or positive tension (for S type or pull type sensor), but not torque.

3. For the same scale, its sensors (3 or 4) must be of the same model and specification. Therefore, when installing the sensor, it is necessary to check whether the contents on the name plate are consistent. The appearance of sensors with different specifications may be the same

4. When welding on the weighing bucket, the control power supply must be disconnected, and the sensor should be short circuited or the ground wire of the welding machine should be directly laid on the weighing bucket to avoid damage caused by excessive current passing through the sensor during welding.

5. After the pull type sensor (S-type) is installed, the locking nut should be tightened. The suspension screw cannot support the root of the sensor groove, that is, a gap of about 10 mm should be left between the suspension screw and the groove root of the S-type sensor.

11、 Maintenance of solenoid valve

Basic requirements: the lubricating oil is antirust turbine oil with viscosity of 2.5-70e; it should be operated at least once every several days at low working frequency; it should not be used in the environment with high dust, large amount of water drops and steam, as well as corrosive gases, chemicals and solutions. Filtered, dry and clean compressed air (air filtration degree less than 40 μ m) should be used.