Peripheral transmission thickener​ manual of installation operation

Peripheral transmission thickener is mainly used for dehydration treatment during wet selection and fine selection in mineral processing, and is used as the first stage of dehydration - concentration. It is generally set between the selection and filtration equipment, sometimes used for dehydration before selection, and can also be used for dehydration operations in the chemical industry and coal preparation plants.

1.Installation of the machine

1. For the convenience of transportation, the entire machine is supplied to users in dispersed components, which are assembled by users at the construction site.

2. Preparation before installation:

(1) Count all other parts of the machine according to the packing list, and make up for any missing or damaged parts during transportation.

(2) Check the dimensions of each part of the concentration tank, such as the diameter of the concentration tank, the depth of the tank center, the cone angle of the tank bottom, the elevation and levelness of the reinforced concrete center, the levelness of the overflow tank overflow weir, and the position of the anchor bolt holes, etc., to ensure consistency with the foundation drawing and assembly requirements.

(3) All machined surfaces of other components should have their protective layer removed and cleaned thoroughly.

3. Installation sequence:

(1) Install the bracket on the reinforced concrete support column, and the installation should reach the maximum possible level to ensure the bracket.

(2) Flexible operation ensures that the electric brushes of the collector are in close contact with the conductive ring. After installation, a slope should be made with high-grade cement at the bottom of the fixed bracket to facilitate the flow of slurry.

(3) Lay tracks on the circumference of the pool to ensure their level and correct water surface elevation. The radial error of the center circle of the rail should not exceed ± 5mm, and the maximum elevation error of the top surface of the rail along the circumference should not exceed D2/1500 millimeters (D2, diameter of the track center circle), with a height difference of no more than 15 millimeters. The height difference between the two ends of the rail at the joint should not exceed 1 millimeter, and the gap between the tracks should meet the requirements specified in the drawing.

(4) Install and assemble the rake frame, which is transported in sections. Weld the joints between each section according to the randomly provided drawings and weld the rake teeth. The following precautions should be taken:

a. The distance between the rake frame and the bottom of the pool shall comply with the specified distance on the manufacturing drawing, with an error not exceeding 20% of the nominal value.

b. The installation size error of the rake frame should meet the following requirements:

Length installation error<8mm

Height installation error<4 millimeters

The plane warping error is less than 8 millimeters in total length and less than 3 millimeters in width.

(5) Install the transmission frame on the rake frame to ensure that the center of the roller width direction does not coincide with the center of the track width direction, with a deviation of no more than ± 2 millimeters.

(6) After adjusting the positions of each part, pour the anchor bolts into the foundation.

(7) After installing the mechanical part, when installing the electrical part, it is necessary to ensure that rainwater does not leak into the collection device when installing the wires of the collection device. And the electrical equipment must be grounded according to the requirements of security regulations.

4. Post installation work:

After the installation of the host is completed, it is necessary to check the installation status of the accessory equipment, and pay attention to the following items:

(1) Check if the chute on the rack is aligned with the hole of the bracket exchange ring to prevent the outflow of slurry.

(2) Whether the pump and its pipelines are intact, whether the pipelines are unobstructed, whether there is any overflow or leakage, and whether they are easy to adjust. The normal operation of Thickener requires that the equipment in this section has variable working capacity and a safe reserve capacity to ensure that the normal operation of the concentration tank is not affected by an accident with one of the pumps in this section.

(3) Users can bring their own overload safety devices. When the motor is overloaded, they can immediately notify the mining station to reduce or stop feeding with an electric bell.

5. Test run of the machine

1. Thickener should first conduct a no-load test for no less than 2 hours on site, and then conduct a load test for no less than 24 hours after there are no issues. Only when everything is normal can it be put into use.

2. Preparation before no-load test drive:

(1) Check whether the installation dimensions are consistent with the manufacturing drawing dimensions, and the gap between the scraper and the pool bottom at each position should meet the requirements of the drawing.

(2) The installation of the host and ancillary equipment should be complete, and separate tests should be conducted on the ancillary equipment to prove reliable operation and no faults.

(3) Check if all bolts are tightened and tighten them.

a) The overflow weir of the overflow channel should be kept stable and on the same horizontal plane, otherwise it should be adjusted with wooden boards. The adjustment method is to fill the overflow channel with water and try to find the level.

b) Check if the electrical appliances are grounded.

c) Add lubricating oil to the gear motor according to its instruction manual into the engraved line.

d) Check if the lubrication is good.

6. Empty load test

The test drive time shall not be less than 2 hours, and the following precautions shall be taken:

(1) The current should be stable without any abnormal fluctuations.

(2) The bearing temperature is unknown to exceed 65 º C, and the temperature rise must not exceed 35 º C.

(3) There must be no interference, abnormal noise, or jumping in any part of the machine.

(4) The rake speed meets the parameter requirements.

7. Load test

After the no-load test adjustment is normal, the load test time shall not be less than 24 hours. At this point, it is necessary to check whether the processing capacity of the thickener, the concentration of the ore feed, the concentration of the ore slurry, and the quality of the overflow liquid meet the production requirements.

8.  The use of machines

1. When Thickener is working normally, the slurry should be evenly added. Throughout the entire feeding process, the flow rate and concentration should be uniform. For this purpose, it is necessary to regularly measure the concentration of ore feed and discharge, as well as the solid content in the overflow, and record the measured results in a register. If abnormal phenomena are found, measures should be taken in a timely manner.

2. Methods for starting and stopping:

(1) Start the electric motor first, and then feed the slurry to avoid too much sediment deposition, which may hinder the start-up

(2) Before parking, the ore supply must be stopped until the mud at the bottom of the pool is almost completely drained before parking.

(3) After emergency parking, the discharge valve at the bottom of the pool must be immediately opened until all the mud at the bottom of the pool is discharged before restarting.

3. During operation, it is necessary to prevent metal or stones from falling into the pool. It is recommended that the user install their own filtration device at an appropriate location in the slurry process.

4. If it is found that the concentration of the thickener processing object is continuously increasing, resulting in an increase in the thickness of the material layer at the bottom of the concentration tank, the discharge amount should be increased.

5. When there is no overload device, if the thickener transmission device is found to be normal but there is overheating and significant roller slippage, it indicates that the thickener has been overloaded. At this point, the maximum production capacity of the pump should be utilized to quickly strengthen ore discharge or temporarily stop ore feeding.

6. Thickener overload may cause serious accidents, in which case the rake will stall and stop rotating. The treatment method is to first stop feeding the ore, immediately stop the car, extract the slurry from above or use high-pressure water to impact and stir the already deposited ore slurry to achieve dilution, and attempt to drive again. If necessary, manual unloading of the ore slurry is necessary.

7. The blockage of the pump pipeline is one of the main faults in operation. The reason is that coarse materials, sawdust, rags, etc. fall into the thickener. The treatment method is to discharge all the slurry in the concentration tank and then rinse it with pressurized water.

8. If the sedimentation of mineral slurry is slow, it is necessary to suggest adding coagulants (such as lime, iron alum, or potato starch) according to work requirements and conditions to promote the solidification of mineral slurry, thereby achieving pure overflow and improving production capacity. However, special attention should be paid to the prohibition of using coagulants that have a corrosive effect on metal components immersed in the bubble.

7. Maintenance and upkeep of the machine

1. When Thickener is operating normally, it is necessary to regularly inspect all moving parts.

2. Lubricate the lubrication parts on time according to the lubrication instructions table.

3. It is necessary to regularly inspect the pipeline and keep it unobstructed.

4. During each parking maintenance, it is necessary to clean or inspect the material trough, ore discharge pipeline, overflow trough and other parts on the tank rack that are prone to blockage due to sediment deposition.

5. Regularly check the contact between the electric brush and the collector ring in the collector device.

6. The track should be kept clean regularly to prevent debris, oil, iron blocks, stones, etc. on the surface of the track, otherwise it will damage the normal operation of the transmission mechanism.

7. During use and maintenance, attention should be paid to the impact of cold weather. Measures should be taken to prevent track icing and the loss of conductivity of the collector due to moisture and freezing.

8. Thickener should stop for maintenance after working for six months.