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Ball mill installation requirements

2021-04-25

Ball mill installation requirements:
(a) The mill installation can refer to the following steps:
1. Basic acceptance.
2. Mill body size measurements.
3. Based on the line.
4. The horns are placed.
5. The main bearing chassis is in place and is aligned once.
6. Grout once.
7. Basic maintenance.
8. The installation of the main bearing seat and a precise search.
9. The grinding body is in place.
10. Secondary fine grouting and secondary grouting.
11. Mounting and grinding external drive system installation.
12. Install a lubricating cooling system.
13. Install inlet and outlet end operating platforms and safety measures.
(II) Basics
1. Basic acceptance acceptance includes the following:
1 In order to ensure the quality and progress of installation, the mortar should be carefully removed before the installation of the mill. The concrete foundation should be free of cracks, looseness, pockmarks, voids, and tendons.
2 The arrangement and dimensions of the foundation bolt holes shall allow the possibility of offsetting any side of the machine floor by 10 to 20 mm.
3 The floor in the anchor bolt hole should be cleaned and there should be no debris in the hole.
4 Based on the actual equipment size of the mill, the inspection of the basic dimensions of the mill and the relative position of the elevation to the plant are in compliance with the relevant technical documents.
2. After the foundation of the center pillar has been inspected, the center pillar can be buried on the basis of the revised drawings of the mill. The dimension of the center pillar is (150-200)×(30-60)mm, and it is firmly embedded in the foundation. On the surface, the center punctuation mark is then marked, and a small punching eye (using a theodolite survey point) is punched out as a basis when the center line is positioned to align the device when the equipment is installed.
1) Method and requirements for burying the central target:
a. The central target shall be located at both ends of the equipment, one at each end, and the center of the target shall be on the centerline of the foundation. Three central targets shall not be embedded on the same centerline.
b. After the central target is embedded, the base surface should be exposed 3-5mm.
c. When the central target is embedded, high-grade cement mortar shall be used for irrigation and fixed, if possible, on the base reinforcement.
3. The benchmark reference point is the standard basis for measuring the elevation when installing the machine. It is based on the zero point of the factory to measure its elevation and mark it.
1) Method of embedding the reference point: The reference point is generally made of rivets, and a 50×50, 10 mm thick steel plate or two 50 mm long rebars are welded to the 50 mm long rivet rod end and buried in the reserved place. High-grade cement mortar is used for watering and fixing.
2) Points to note when embedding the reference point:
a. The ground point of the reference point should not be too high (less than 10mm)
b. The pit where the reference point is buried should be made small and large.
c. Benchmarks should be checked frequently to avoid ground subsidence or other causes and their elevation changed without detection.
d. When not in use, it must be covered with an iron box to prevent damage. If any trace of damage is found, it must be re-measured before use.
e. The reference point should be buried in the position convenient for measuring the elevation, and the closer to the measuring surface of the installation machine, the better.
4. Base line base line is a very important process in the mill installation process. It has a direct impact on the installation quality of the mill, and must be fully understood in the process of marking, and the technical requirements given in the modified installation drawings and basic drawings after physical verification.
According to the drawings, the vertical and horizontal centerlines and reference points of the mill and the vertical and horizontal centerlines of the transmission are drawn on the basis of the drawings.
After the center line is determined, a center point with a diameter of no more than 1 mm shall be punched out on the center target, and a red paint garden shall be drawn around the center to show eye-catching. The quality requirements for the base line shall be as follows:
1) The error of the distance between the transverse center lines on the basis of the two main bearings shall not exceed 1/10 of the thermal expansion of the grinding body and shall not exceed 1 mm.
2) The displacement between the longitudinal centerline indicated on the central target and the longitudinal centerline on the drawing shall not exceed +3mm.
3) The center line of the grinding body centerline and the drive shaft must be strictly parallel, and the error of the distance between them is not more than +0.5mm.
4) The adjacent base must be measured so that the diagonals are equal to ensure that the longitudinal centerline is 90 degrees.
5. Hanging centerline:
The purpose of hanging the centerline is to check each department's relationship during the installation process.
(iii) Installation of anchor bolts
1. Before laying the anchor bolts before laying, the rust and oil on the anchor bolts should be removed. However, the threads should still be coated with grease to prevent rust. Check whether the nuts and bolts are properly fitted.
2. When laying anchor bolts, it should be vertical, and the non-perpendicularity tolerance is 1/1000.
3. Cautions when tightening the nuts:
1) Add washers under the anchor bolts;
2) The locking device shall be used for both nuts and bolts;
3) Between the nut and the washer, the washer and the equipment base should be ensured to be in plane contact to avoid extra load on the anchor bolt;
4) After the concrete reaches 75% of the design strength, the anchor bolts are allowed to tighten;
5) Tighten the anchor bolts from the middle of the equipment. Then proceed diagonally and diagonally at both ends. At the same time, the force should be uniform. It is forbidden to tightly tighten one side and tighten the other.
6) After tightening the nut, the bolt must be exposed 1.5 to 5 pitches.
(4) Main Bearing
1. Bearing chassis chassis chassis should be cleaned before installation, and then in the bearing chassis on the upper surface of the bearing block and the chassis of the connecting bolt holes or side of the reference surface as a benchmark, draw the vertical and horizontal centerline as the installation of alignment guidelines, and then Install the anchor bolts on the foundation together with the base, and place the horn under the base. The anchor bolts and the base are positioned with special sleeves, checked by checking the centerline of the foundation, and the base is adjusted to the correct position.
1) The distance between the centerline of the two chassis should generally meet the design requirements. If the actual size and design of the cylinder and the hollow shaft are not in conformity, the actual size can be constructed;
2) The longitudinal centerline of the two bearing chassis shall be parallel, and the tolerance of the non-parallelism shall not be greater than 0.5mm per meter;
3) The horizontal bearing error of the main bearing chassis is 0.1mm per meter, the tolerance of the elevation of the two bases is 0.5mm, and only the feeding end is allowed to be higher than the discharging end;
4) After the elevation of the main bearing chassis, the adjustment of the horizontal position, the inspection and the mutual position correction are qualified, the foot bolts of the bearing base of the gravel concrete pouring can be used.
2. The bearing housing places the bearing housing on the bearing chassis. Using the high center point of the concave spherical surface of the bearing housing as a reference point, the vertical center line of the bearing housing is found by suspending the perpendicular line to coincide with the corresponding centerline of the bearing chassis.
The contact surface of the bearing seat and the bearing chassis should be evenly contacted along its circumference. The partial clearance shall not be greater than 0.1mm, and the non-contact length shall not exceed 100mm. The cumulative length shall not exceed 1/4 of the length of the circumference.
After installation, the cooling water channel of the bearing seat should be connected and a hydrostatic test should be carried out with a test pressure of 0.4 MPa and a holding time of 10 minutes. (Many large and medium-sized mills do not need this test if there is no cooling water channel)
3. Bearings before the installation of the bearing pressure test, the value of not less than the rated working pressure of the high pressure pump (32 MPa) test pressure not less than 5 minutes. Bearings and spherical surfaces should be in good contact and their fit should conform to the drawings.
(v) Body grinding
1. Before installing the grinding body, the shaft diameter of the main bearing and the hollow shaft should be thoroughly cleaned. When hoisting the grinding body, it is absolutely forbidden to bolt the wire rope on the shaft diameter of the hollow shaft to avoid scratching the shaft journal. Dust should be prevented during installation. Miscellaneous objects fall on the surface of the pad. When the journal of the hollow shaft falls to contact with the surface of the pad, the pad stops falling. At this time, flush the bearing pad surface with diesel oil once, then add a little oil on it and then place the hollow shaft on the bearing pad, taking care not to hit the bearing pad.
After the grinding body lands on the main bearing, it must be carefully checked and the results meet the following requirements:
1) After the rotary part is mounted on the two main bearings, the contact between the hollow shaft and the main bearing bush should be checked and the design requirements must be met;
2) The upper busbars on the two hollow shafts should be on the same level, the deviation should not exceed 1mm, and only the feed end can be higher than the discharge end;
3) The axial clearance between the shaft shoulder of the feeding hollow shaft and the main bearing bush should meet the design requirements;
2. Before the second pouring to the foundation for the second casting, the anchor bolts should be tightened, and the oil, paint, rust, etc. on the bearing base and horn should be removed. The cement should be compacted during pouring, and there should be no defects such as gaps or honeycombs.
3. The internal parts of the barrel body are mostly directional, such as: step linings, lifting plates, feed and discharge screw barrels, and stern plates. When installing these directional components, it must be carried out according to the regulations on the equipment documentation. Failure to install it may cause the mill to fail to produce. At the same time, cemented sand was used for plug welding on the back venting area.
1) Between the end liner end liner and the end cap of the cylinder, in order to avoid the slurry or material flushing the end cap (with a certain distance between the two), the gap should be filled with high grade cement mortar. When applying mortar on the end cap, the special wooden pin should be inserted into the bolt hole of the end cap. This not only protects the bolt hole of the end cap from being blocked. Holes for bolts were also left. Pay attention to the outer edge of the wooden pins coated with a layer of grease. This is for exiting the wooden pins.
2) In and out of material spiral tube When installing the spiral tube, first check whether the rotation direction of the screw is consistent with the rotation of the mill. Between the in-out screw and the hollow shaft, it should be put into the insulation material, asbestos or rock surface.
3) The partition board and the discharge board should pay attention when installing the partition board and the discharge board:
a. When installing the compartment plate frame, pay attention to the direction of the lifting plate;
b. The boring plate hole is divided into the feeding end and the discharging end, and the direction can not be reversed;
c. When the gap between the two jaws is too large, round steel welding is used;
d. All the nuts inside the barrel are tightened and welded again after the mill is fully loaded.
2. Before installing the gearwheel on the gear body, install the gear housing on the lower gear and check if the gear housing is leaking. The gear mounting should meet the following requirements:
1) The end face of the gear end and the end face of the flange of the cylinder should be closely fitted. If there is a gap, it should not exceed 0.15mm.
2) The clearance of the large gear at the Huff facing flange should not exceed 0.1mm, and the pitch deviation here should not exceed 0.05m (m-gear module)
3) After the large gear is installed on the cylinder body, the tolerance of the radial circular runout of the hollow shaft at both ends of the gear top circle shall not be greater than 1.23mm, and the runout tolerance of the end surface shall not be greater than 1.72mm.
(vi) After the gears have been aligned, the gears can be installed. The procedure is:
Pinion gear - main reducer - main motor - auxiliary drive
1. After pinion assembly
1) The gear side clearance should be between 1.4-2.4mm;
2) The contact spot of the size gear should not be less than 40% along the tooth height, not less than 80% along the tooth length, and should occupy the middle of the tooth width.
2. Main reducer installation. It shall comply with the relevant regulations and requirements of the technical documents attached to the installation and operation instructions of the equipment. Main reducer between the slow shaft and the pinion shaft: The shaft end clearance is 8~10, and the coaxiality is φ0.1. That is, the radial deviation between the centerlines of the two-tooth couplings is not more than 0.1 (Note : This data is in accordance with the provisions of the reducer factory) The inclination is not more than 0.3 per meter (The axial clearance between the two tooth coupling end faces, the deviation in the average of four points along the circumference is not greater than the diameter of the coupling end face Three out of ten
It must be pointed out that since the coaxiality between the two halves is measured, the dial indicator is used as the table seat. The error obtained by measuring the outer diameter of the coupling of each other is regarded as the error of the two axes. Therefore, the coaxiality of the shaft hole and the outer circle of each half-coupler should be first ensured during gold machining, otherwise such measurement and adjustment are meaningless. In particular, gear couplings have a certain degree of difficulty in processing and must have good process equipment guarantees. It is not uncommon for a mill to vibrate due to problems with the coupling, breakage of other parts of the pins and even failure of the mill. Therefore, the parameters of the coupling group affecting its concentricity must be strictly checked before leaving the factory!
3. The installation of the main motor shall comply with the requirements of the "installation instructions for use" of the equipment.
The coaxiality of the main shaft of the main motor and the main reducer is φ0.05, that is, the radial deviation between the centerlines of the two couplings is not more than 0.05mm, and the inclination is not more than 0.05 per meter, that is, the end face of the two-tooth coupling. The axial gap between the four points along the circumference of the average deviation is not greater than five hundred thousandths of the diameter of the end face of the coupling (Note: This data is the requirements of the motor factory) (refer to Figure 6).
4. Auxiliary drive installation: It is through the two helical gear clutch to connect the fast axis of the other end of the main deceleration shaft with the slow shaft of the auxiliary reducer. After installation, it should be ensured that when the clutch is disengaged, the distance between the middle 10mm is empty.
5. Electrical installation of the drive section The main motor starting cabinet is preferably no more than 100 meters from the transformer substation. The shorter the better, the starting cabinet shall be no more than 10 meters away from the motor so that the operation of the mill can be observed when operating in front of the cabinet.
In order to increase the active power of the main motor, it is recommended that users install it into the camera or capacitor cabinet.
The power line and control line of each motor must meet the needs of its pressure resistance and current carrying capacity.
(7) Installation of lubrication system
1. The installation elevation of the thin oil station shall be based on the principle that the return oil outlet of the lubricated equipment is higher than the upper oil inlet 450 of the dilute oil station, so as to ensure the oil pressure difference and make the oil return smooth. It should also be taken into account that there is room for the oil receiver under the drain hole of the tank (note that when doing the foundation).
2. All high and low pressure oil pipes and fittings meet the requirements in terms of materials and specifications. Must be pickled before installation, 10% soda water, hot water, and dried.
3. Parallel or intersecting pipes, with a certain distance between the two pipes to prevent vibration.
4. After all the pipelines are installed, the diesel oil is put into trial operation first. Before the trial run, please note:
1) Cover the hollow shaft to prevent dirt from entering between the hollow shaft and the main bearing bush;
2) Disconnect the return line at the lubrication station to prevent dirt from entering the tank. So wash 2 to 3 times.
5. The low pressure system should be at 0.9 MPa, and the high pressure system should be qualified at 20 MPa.

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The coupler surface is silver and light.

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