CN115007275A

CN115007275A - Mounting construction method of bowl type medium speed coal mill

Info

Publication number: CN115007275A
Application number: CN202210599601.3A
Authority: CN
Inventors: 张建月; 董军; 张荣泰; 牛仙鹏; 王二建; 刘志兴
Original assignee: China Chemical Engineering Second Construction Corp
Current assignee: China Chemical Engineering Second Construction Corp
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-09-06

Abstract

The invention relates to a mounting construction method of a bowl-type medium-speed coal mill, which is characterized in that according to the longitudinal and transverse center lines of a main shaft of the bowl-type coal mill, a theodolite is matched with a steel tape by using a wire drawing method on the basis of the longitudinal and transverse center lines, all the center lines and dimension lines are measured, the basic center lines of a speed reducer and a motor are drawn, and all the reference lines are led to a basic vertical surface to be marked. And then, installing the base plate according to the center line of each foundation and the center line of the base plate, configuring a sizing block, and measuring the levelness by using a high-precision frame type level meter so as to ensure the installation precision of the bowl type grinding machine. The subsequent construction is adjusted by taking the installation central position of the speed reducer as a standard, so that the installation accuracy of each part of the coal mill is ensured.

Description

Mounting construction method of bowl type medium speed coal mill

Technical Field

The invention relates to the technical field of coal mill installation, in particular to a construction method for installing a bowl type medium-speed coal mill.

Background

The bowl type medium speed coal mill mainly comprises a coal dropping pipe, a separator device, a side machine body, a grinding bowl, a planetary gear reduction box (speed reducer), a driving motor, a matched oil station and the like. Taking the middle-safety combined coal chemical engineering project born by the secondary chemical industry group Limited company as an example, 3 HP1203/Dyn bowl-type medium-speed coal mills are provided, each mill weighs about 230 tons, has the height of about 12m, has the rotating speed of 27r/min and the raw coal processing capacity of 80t/h, and is integrally installed in a one-layer structural frame of coal grinding frame steel.

The bowl-type coal mill is of a vertical structure, and the vertical concentricity must be ensured. In order to ensure that the coal mill unit is successfully tested once and safely and stably operated after being put into production, the procedures and the quality of key procedures such as assembly and inspection of all parts of the coal mill, centering and alignment of a coupler and the like need to be strictly controlled so as to ensure the installation precision of the coal mill unit.

Disclosure of Invention

The invention aims to provide a mounting construction method of a bowl-type medium-speed coal mill, which is beneficial to improving mounting precision.

In order to achieve the purpose, the invention adopts the technical scheme that:

a mounting and construction method of a bowl-type medium-speed coal mill comprises the following steps:

step 1, installing a speed reducer;

arranging a sizing block according to the position of a foundation bolt on the foundation and the actual situation of a bottom plate of the reduction gearbox, and controlling the elevation by using a level gauge and the level by using a frame type level gauge in the setting process;

mounting a speed reducer bottom plate, measuring the levelness of the speed reducer bottom plate by adopting a bridge type level bar and a frame type level meter, temporarily mounting the speed reducer in place after the levelness is adjusted to be qualified, and performing secondary grouting and bolt pre-tightening on the speed reducer bottom plate; after the foundation bolts of the speed reducer are completely pre-tightened to meet the requirements, rechecking the levelness, testing the installation levelness and the surface flatness of the bottom plate, and after the rechecking of the levelness and the surface flatness of the bottom plate is qualified, formally installing the speed reducer in place and positioning;

step 2, installing a side machine body;

arranging a sizing block, installing a side machine body on a bottom plate of the speed reducer after primary leveling and alignment, and finishing before formal installation of the speed reducer; in the process of side machine body alignment confirmation, the center and the elevation of the bottom plate of the speed reducer are taken as references, and the elevation and the center of the bottom plate of the side machine body are retested according to the actual elevation and the center of the speed reducer;

step 3, mounting a grinding bowl and an impeller; adjusting the gap between the bowl grinding scraper and the side machine body by adopting a micrometer to measure;

step 4, mounting the rotary separator device;

the separator body is hung on the side machine body, the marks on the separator body and the side machine body are aligned, the separator body and the side machine body are in the same central position, and the connecting bolt of the separator body and the side machine body is screwed according to the drawing requirement; rotating the separator rotor to place after the grinding rollers are installed, hanging the rotor onto three grinding rollers in the separator body, temporarily fixing the rotor, and lifting the rotor body to a specified position by using a driving device after the top driving device is installed; a top cover of the separator and a single outlet device are arranged,

step 5, installing a top driving device;

suspending the top drive assembly from the top head of the separator, aligning the markings on the top drive assembly and the top head of the separator and aligning the attachment flanges;

step 6, lifting the rotor and connecting the rotor with a top driving device;

step 7, installing a spring loading device;

after the spring is preloaded, the spring is integrally hoisted on the separator body and connected through a bolt;

step 8, installing a coal dropping pipe;

step 9, installing the motor;

the motor bottom plate is arranged after the spring loading device is arranged, the motor is placed on the motor bottom plate and is centered with the speed reducer, the motor is lifted away from the bottom plate after the motor bottom plate is qualified, secondary grouting and bolt pre-tightening are carried out on the motor bottom plate, and the motor is formally arranged at a specified position on the motor bottom plate; after the motor is installed, centering a coupler, and measuring by adopting a dial indicator when the coupler is centered;

and step 10, installing a speed reducer lubricating oil system.

Furthermore, in the step 1, according to the longitudinal and transverse central points on the central target plate, a steel wire is pulled above the coal mill foundation, the position of the speed reducer bottom plate is adjusted to enable the speed reducer bottom plate to coincide with a steel wire cross line, and after the speed reducer bottom plate is installed, the central line of the speed reducer bottom plate is used as a datum line for subsequent unit installation.

Further, in the step 3, the grinding bowl and the impeller are integrated, the grinding bowl and the impeller are hoisted to the designated height by using a hoisting tool, the grinding bowl and the impeller device are lowered, and the grinding bowl and the impeller device are placed in a side machine body and are placed on the gear box; mounting the grinding bowl shell on the gear box by using a bolt; fixing the scraper device on the bowl grinding hub, spot-welding the scraper device with a fastener by using round steel, adjusting a gap between the bowl grinding scraper and the side machine body, and fixing the bowl grinding hub lining plate on the bowl grinding hub by using the fastener; and hoisting the grinding roller to the grinding roller bracket and installing the trunnion, aligning the grinding roller head with the trunnion, and fixing the grinding roller head and the trunnion together.

Further, in step 6, a bottom flange of the top driving device connected with the rotor and an upper flange of the rotor are cleaned, a steel wire rope is fixed through a hanging ring on the upper portion of the rotor, the rotor is lifted until the upper flange and the lower flange can be smoothly connected and the flanges are concentric, and a plane sealing glue and a screw thread anti-loosening glue are coated on the joint surfaces of all the flanges and the surfaces of flange connecting bolts during installation.

Further, in the step 7, after the spring is connected with the separator body through the bolt, the grinding roller hole cover is vertically lifted to be close to the separator body door frame, and the grinding roller limiting pull rod is placed in the grinding roller head groove.

Further, in step 8, the coal dropping pipe is divided into a coal dropping pipe, a coal dropping pipe and an upper coal dropping pipe, the installation is divided into two parts, the coal dropping pipe and the coal dropping pipe are connected through butt welding, the inner support arranged through the rotor body is fixed, and the coal dropping pipe and the upper coal dropping pipe are connected through flanges.

Further, in step 10, a speed reducer lubricating oil device is placed on a base adjacent to the coal mill, a lubricating station device is fixed by using expansion bolts, and a pipeline between the lubricating oil station device and the speed reducer is installed.

Furthermore, the circulating oil in the lubricating oil system of the speed reducer is added with oil by the oil filter and is filtered by the three-level filter screen, so that the cleanliness of the circulating oil is ensured, and a precondition guarantee is provided for flushing the circulating oil.

In the construction method, according to the longitudinal and transverse center lines of the main shaft of the bowl-type coal mill, a theodolite is matched with a steel tape by using a steel wire drawing method on the basis of the longitudinal and transverse center lines, all the center lines and dimension lines are measured, the basic center lines of a speed reducer and a motor are drawn, and all the reference lines are led to a basic vertical plane to be marked. And then, installing the base plate according to the center line of each foundation and the center line of the base plate, configuring a sizing block, and measuring the levelness by using a high-precision frame type level meter so as to ensure the installation precision of the bowl type grinding machine. The bowl type coal mill is of a vertical structure, the vertical concentricity must be guaranteed, the position of the speed reducer is guaranteed in the installation process, and the subsequent construction is adjusted by taking the installation center position of the speed reducer as a standard, so that the installation accuracy of all parts of the coal mill is guaranteed.

Drawings

FIG. 1 is a flow chart of the construction process of the present invention.

Detailed Description

In this embodiment, the installation and construction method claimed in the present invention is further clearly and completely described with reference to fig. 1 and a relatively specific bowl-type medium speed coal mill, and the specific steps are as follows.

Preparation for construction

And (4) technical preparation, namely, reviewing and compiling the drawing, and carrying out technical background agreement through approval.

Preparation of a construction site: the construction equipment is prepared and comprises a hoisting tool, a steel wire rope, a measuring instrument and the like.

Equipment unpacking inspection

The coal mill is large in size, not easy to transport integrally and has to be transported by parts, so that the coal mill is opened to check and accept according to the batch arrival condition of the parts.

Acceptance of foundations

The basic appearance should not have the defects of cracks, honeycombs, holes, exposed ribs and the like; the strength meets the design requirement.

Accurately measuring the elevation deviation of different planes of the coal mill foundation by using a level gauge, wherein the allowable deviation is between 0 and minus 20 mm; the top elevation of each embedded foundation bolt (the embedded foundation bolts comprising a speed reducer, a side machine body and a motor) is measured by using a level gauge respectively, and the installation elevation of the whole unit is determined by the lowest top elevation among the speed reducer, the motor and the embedded foundation bolts of the side machine body in consideration of the inconsistent embedding heights of the bolts in the actual installation process.

And drawing steel wires in the longitudinal and transverse directions above the foundation, taking the central lines of two groups of embedded foundation bolts in the longitudinal and transverse directions of the speed reducer as datum lines, embedding a central standard plate beside the foundation and punching holes. The deviation of the center of each embedded foundation bolt relative to the longitudinal and transverse center lines is accurately measured by the aid of the line hanging weight and the ruler, and the adjustable gap of the bottom plate bolt holes is 10mm, so that if the deviation of the maximum center positions of the embedded foundation bolts of the speed reducer and the motor bottom plate exceeds 10mm, when the embedded foundation bolts of the speed reducer and the motor bottom plate cannot be adjusted through the bottom plate bolt holes, corresponding bottom plate bolt holes need to be subjected to reaming treatment.

And (3) basic retesting: and (4) retesting the elevation, position and levelness of the foundation, retesting the elevation, position and verticality of the foundation bolt, and determining the foundation bolt to be qualified in technical data and standard requirements.

The concrete foundation top layer uses pocket tool to chisel hair through the manual work, ensures that top layer laitance clean up, pit degree of depth and density reach the requirement, increases reinforcing bar net piece simultaneously between basis and bottom plate, provides the condition for the secondary grouting quality and the shock resistance in guarantee later stage.

Speed reducer installation

1 sizing block arrangement

According to rag bolt position and reducing gear box bottom plate actual conditions, rationally arrange the parallels, set up 20 groups parallels as required, parallels size 320 × 160mm, the parallels surface is polished smoothly, no oxide skin, splash etc. set up adjusting screw and be used for adjusting the installation elevation and the level of parallels at the flat parallels side, for guaranteeing parallels installation quality, use spirit level control elevation, use frame spirit level control level in setting up the process. The on-site sizing block arrangement adopts a sizing method, and grouting material is poured from one side when sizing blocks are used for sizing.

The sizing block is arranged by adopting a sizing method, and the elevation and the levelness of the sizing block are ensured to meet the requirements through the arrangement and measurement of the temporarily added adjusting bolt, the leveling instrument and the frame type level instrument, so that the success rate of the one-time installation quality of the bottom plate of the coal mill is improved.

2 installation of speed reducer bottom plate

1) The binding mode is required in the process of unloading, consignment and installation of the bottom plate, the positions of the lifting points are symmetrical and uniform, and the deformation of the bottom plate is prevented;

2) cleaning the upper surface and the lower surface of the bottom plate before the bottom plate is in place, and coating anti-occlusion lubricating oil (molybdenum disulfide) on the surfaces of the embedded bolts;

3) before the bottom plate is in place, a hemp is wound between the embedded bolt and the embedded bolt, so that grout can not leak out of the gap during grouting;

4) according to the longitudinal and transverse center points on the center standard plate, a steel wire is pulled above the coal mill foundation, the position of the speed reducer bottom plate is adjusted to enable the speed reducer bottom plate to be coincident with a steel wire cross line, the deviation of the center line is not more than 2mm, and after the speed reducer bottom plate is installed, the center line is used as a reference line for subsequent unit installation.

5) The standard of the bottom plate is 2940 multiplied by 2306mm, the thickness of the bottom plate is 80mm, the deformation exists in different degrees when the bottom plate arrives at the field, the maximum integral deformation amount reaches 4mm through field measurement, in the field installation process, the level elevation of the sizing block close to the side machine body foundation is controlled to be positive deviation, the level elevation of the sizing block far away from the two sides of the side machine body foundation is controlled to be negative deviation, in the bottom plate adjusting process, the levelness of the bottom plate can be adjusted to be within a required range by adjusting the matching of the sizing blocks at the two sides and pre-tightening anchor bolts, manual pre-tightening is firstly adopted in the adjusting process, and then mechanical pre-tightening is adopted. Magnesium-aluminum alloy bridge type level ruler (2400 mm), frame type level gauge (0.02 mm/m) and a filler gauge are used for detection, the installation levelness and the surface flatness of the bottom plate are detected, the process requires that the 0.10mm filler gauge between the bridge type level ruler and the bottom plate is not inserted, and the absolute levelness of the bottom plate is controlled within 0.127 mm.

The levelness of the bottom plate of the speed reducer is measured by adopting a bridge type level bar and a frame type level meter, so that the equipment installation precision is ensured, and the follow-up procedures are ensured to be smoothly carried out.

3 speed reducer preinstallation

After the bottom plate is adjusted to be qualified, the speed reducer is temporarily installed in place, the gap between the speed reducer and the bottom plate is measured, the filler gauge with the thickness of 0.10mm is qualified when the filler gauge is not inserted, the levelness of the top surface of the speed reducer in two directions of vertical and horizontal directions is measured, the levelness of the top surface of the speed reducer is used as a reference, bubbles of a water column of a level meter can be seen, and after the bottom plate is qualified, the speed reducer is hung down from the bottom plate of the speed reducer and is entrusted to secondary grouting of a civil engineering unit.

4 secondary grouting of speed reducer bottom plate and bolt pre-tightening

The foundation anchor bolt of the speed reducer is a pre-embedded anchor bolt, and primary grouting is not performed. The phi 600 round hole is reserved in the middle of the bottom plate, the sizing blocks between the bottom plate and the foundation are densely arranged and provided with the reinforcing steel meshes, so that the resistance brought to grouting is large, grouting materials cannot freely flow to the edge of the foundation when grouting is carried out on the middle round hole, and a two-side grouting method is adopted on site until the grouting materials freely flow to the middle round hole and are 10mm higher than the lower surface of the bottom plate. Pre-tightening the foundation bolts after the grouting layer reaches the required strength, pre-tightening the foundation bolts by using a manual hydraulic pump of a special tool for a coal mill for three times, wherein the pre-tightening force is respectively 30%, 70% and 100%, and the final pre-tightening force reaches 850kN (the corresponding value of a pressure gauge of the manual hydraulic pump is 43.37 MPa); and when the bolt is pre-tightened, the operation is symmetrical, and the integral flatness and the change of the levelness of the bottom plate are monitored in real time by using a bridge type level gauge, a feeler gauge, a frame type level meter and the like, so that the integral flatness and the change of the levelness do not exceed an allowable value.

And 5, formally installing a speed reducer:

1) after the foundation bolts of the speed reducer are completely pre-tightened to meet the requirements, rechecking the levelness, testing the installation levelness and the surface flatness of the bottom plate, and controlling the absolute levelness of the bottom plate within 0.127mm when a 0.10mm clearance gauge between the bridge type level gauge and the bottom plate is required to be not inserted;

2) after the levelness and the surface evenness of the bottom plate are checked to be qualified, the speed reducer is formally installed in place and positioned, the gap between the speed reducer and the bottom plate is checked to be qualified when a 0.10mm feeler gauge is not inserted, the levelness of the top surface of the speed reducer in the longitudinal direction and the transverse direction is measured, the levelness of the bottom plate is used as a control point, and the levelness of the top surface of the speed reducer is used as a reference.

Side body mounting

1 sizing block arrangement

The setting process of the side machine body sizing block is the same as that of the speed reducer sizing block.

2 side machine body bottom plate is in place and is initially aligned

The installation procedure of the side engine body bottom plate before grouting is the same as that of the speed reducer bottom plate; the side machine body is arranged on the bottom plate of the speed reducer and is primarily leveled and aligned, and the side machine body is finished before the speed reducer is formally installed. In the process of side machine body alignment confirmation, the center and the elevation of the bottom plate of the speed reducer are taken as references, and the elevation and the center of the bottom plate of the side machine body are retested according to the actual elevation and the center of the speed reducer, wherein the deviation is not more than 2 mm. After the center and the elevation of the side machine body are determined, the bottom plate of the side machine body is in a natural level, the lower side sizing block is compacted, a certain length of the sizing block leaks outwards, and a certain regulating quantity is reserved.

3 side body mount

1) The side bodies are removed from the transport and the surface on the floor is wiped clean. The capacity and the safety of hoisting facilities are confirmed according to the weight on the weight parameter table of each component of the coal mill;

2) cleaning the upper surface of the bottom plate of the side machine body and coating a layer of light oil;

3) and the side machine body is arranged on a bottom plate of the side machine body and is arranged according to a layout of the coal mill so as to ensure the correct position of the air inlet.

4-side machine body secondary grouting

1) And the grouting of the side machine body is carried out after the gap between the bowl grinding scraper plate and the bottom plate of the side machine body is adjusted to be qualified.

2) Adopting a single-sided outer grouting method on the site of the side machine body until grouting material freely flows to the inner measuring template and is 10mm higher than the lower surface of the inner measuring bottom plate;

3) other requirements are the same as the secondary grouting of the bottom plate of the speed reducer.

4) And drilling hinge pin holes on the bottom plate of the side machine body according to the general drawing requirements after grouting, coating lubricating oil on the positioning pins, and then pressing the positioning pins to firmly position the side machine body.

The clearance between the bowl grinding scraper and the side machine body is adjusted and measured by a micrometer, so that the sealing clearance of the coal mill is ensured.

Grinding bowl and impeller mounting

1 grinding bowl and impeller integral installation

1) The grinding bowl and the impeller are integrally delivered;

2) hoisting a grinding bowl hub lining plate to be close to a side machine body;

3) cleaning the bottom surface of the grinding bowl hub, and coating a light oil film on the surface matched with the gear box;

4) and hoisting the grinding bowl and the impeller to the specified height by using a hoisting tool. The grinding bowl and impeller assembly is lowered into the side housing and placed on the gear box with the locating pins properly aligned. The gearbox input shaft cannot be rotated when the locating pins are aligned.

5) Coating thread adhesive on the threads of 8 studs, wherein the bolts are used for installing the grinding bowl shell on the gear box, and the depth of the threads screwed into the connecting flange is 90 mm;

6) installing a hexagon nut and a washer (coating to prevent biting);

7) using a torque wrench to pull each nut to 81.3 N.m (60 FT-LBS) according to the serial number sequence of the bolts;

8) repeating the step 6, and tightening the nut to 122 N.m (90 FT-LBS);

9) repeating the step 6, and tightening the nut to 181.7 N.m (134 FT-LBS);

10) tensioning the studs to 300KN by using a bolt pre-tensioning device according to the serial number sequence of the bolts;

11) repeating the step 9, and tensioning the stud to 667 KN;

12) adjusting the clearance between the sealing ring and the grinding bowl hub to be 0.5 +/-0.25 mm according to the general technical requirements of the coal mill, fixing the sealing ring and the grinding bowl hub by using a screw after adjusting, and screwing the sealing ring and the grinding bowl hub to be 54.2 N.m.

2 adjusting the gap between the bowl-grinding scraper and the side machine body

The scraper device is fixed on the grinding bowl hub according to the requirements of the part drawing, round steel is used for spot welding with the fastener, the gap between the scraper and the side machine body is adjusted to be 9 +/-5 mm according to the technical requirements of the coal mill, and the fastener is screwed and welded according to the torque required by the part drawing after the gap is adjusted. After the heat insulating material is filled, the grinding bowl hub lining plate is fixed on the grinding bowl hub by a fastener.

3 sealing and shroud mounting

1) After the sealing ring is placed on the grinding bowl, the gap between the sealing ring and the grinding bowl hub is adjusted to enable the circumferential gap between the sealing ring and the grinding bowl hub to be the same, then the bolt is coated with an adhesive, and the bolt is screwed up according to the requirements of a drawing;

2) filling the packing into a sealing ring, coating an adhesive on the stud, assembling a sealing gland according to the pairing mark, tightly pressing the packing by using the sealing ring gland, and screwing down the packing with a torque of 13.5 N.m;

3) installing the positioning nail into the sealing ring and the sealing gland according to the requirements of a drawing;

4) the shield is assembled.

Grinding roller installation

The grinding roller is installed on the rotating separator device, construction is carried out after the separator body is installed, the trunnion and the ball seat hole of the grinding roller are cleaned, the grinding roller is hoisted to the grinding roller bracket by utilizing a special hoisting facility, then the trunnion is installed, the grinding roller head is aligned with the trunnion, and the grinding roller head and the trunnion are fixed together. In the installation, when one end trunnion leans on the trunnion end tightly, the clearance between the other end trunnion and the trunnion end is allowed to be within the range of 1.79-5.09 mm.

Rotating separator device mounting

1 separator body mounting

Cleaning a bottom flange of a separator body and a top flange of a side machine body, coating a layer of sealant on the top flange of the side machine body and the bottom flange of the separator body, hanging the separator body on the side machine body, aligning marks on the separator body and the side machine body and enabling the separator body and the side machine body to be in the same central position so as to ensure the correct positions of an air inlet, a grinding roller through hole and a pulverized coal pipe, and tightening a connecting bolt of the separator body and the side machine body according to the drawing requirement after alignment. Adjusting the clearance between the sealing ring and the grinding bowl impeller sector to be 9 +/-2 mm, and welding the sealing ring to the separator body after the clearance is adjusted.

2 rotating separator rotor into position

The rotor of the rotary separator is placed in place after the grinding rollers are installed, the rotor is hung on three grinding rollers in the separator body and is temporarily fixed, and the top driving device is used for lifting the rotor body to a specified position after the top driving device is installed.

3 mounting of separator head cover and single outlet device

The top cover and the single outlet device of the separator are integrally delivered, the bottom flange of the top cover of the separator and the top flange of the separator body are cleaned, and the joint surfaces of all flanges and the surfaces of flange connecting bolts are coated with plane sealing glue and screw thread anti-loosening glue during installation. The separator top cover is hung on the separator body, and the marks on the separator body and the separator top cover are aligned and the separator body and the separator top cover are in the same central position.

4 mounting of rotating bearing seat

Cleaning a connecting flange of the rotary bearing seat and the top cover of the separator, coating a plane sealing glue and a screw thread anti-loosening glue on a flange joint surface and the surface of a flange connecting bolt, and fixing the rotary bearing seat firmly according to requirements.

Top drive mounting

And cleaning a bottom flange of the top driving device connected with the top cover of the separator and a top flange of the top cover of the separator, wherein a plane sealing glue and a screw thread anti-loosening glue are coated on the surfaces of all flange joint surfaces and flange connecting bolts during installation. The top drive assembly is hung from the top of the separator, and the marks on the top drive assembly and the separator top cover are aligned and the flanges are concentric.

Rotor lifting and mounting

Cleaning a bottom flange of a top driving device connected with a rotor and an upper flange of the rotor, fixing a steel wire rope through a hanging ring on the upper portion of the rotor, hoisting the rotor until the upper flange and the lower flange can be smoothly connected and the flanges are concentric, and coating a plane sealing adhesive and a screw thread anti-loosening adhesive on the surfaces of all flange joint surfaces and flange connecting bolts during installation. The rotor body was adjusted so that the gap between the separator head and the rotor body was controlled to 3 (+ 1.5 to-0) mm.

Spring loaded device mounting

1 spring-loaded device body mounting

Cleaning the joint surface of the grinding roller hole cover and the door frame flange of the separator body, coating sealant, integrally hoisting the preloaded spring (with the preload of 19050kg and the compression length of 25.4 mm) to the separator body, and connecting the preloaded spring and the compressed spring by bolts.

2 installation of grinding roller pull rod bolt and pull rod nut

The cover of the grinding roller hole is vertically lifted, the height of the cover is that a bolt of a grinding roller pull rod is higher than the grinding roller head by more than 50mm, then the cover is slowly close to a door frame of a separator body, and then the cover is slowly and vertically put down at the central position to ensure that the grinding roller limit pull rod is put into a groove of the grinding roller head. And fastening with bolts according to requirements, and coating thread adhesive on the heads of the bolts. The adjusting gap between the loading spring head and the grinding roller head is controlled to be 0.5-1.5 mm, and the gap between the grinding roller sleeve and the grinding bowl lining plate is adjusted to be 3-5 mm by adjusting a pull rod bolt (gap is dynamically adjusted).

Coal chute installation

The coal dropping pipe is divided into a coal dropping pipe, a coal dropping pipe and an upper coal dropping pipe three section, the coal dropping pipe is connected with the coal dropping pipe through butt welding, and the coal dropping pipe is fixed through an inner support arranged on the rotor body. The coal dropping pipe is connected with the upper coal dropping pipe through a flange, and a flange joint surface and the surface of a flange connecting bolt are coated with plane sealing glue and screw thread anti-loosening glue.

Motor mounting

1 Motor bottom plate mounting

The motor bottom plate is installed and is carried out after the spring loading device is installed, and the large part of the coal mill body is hoisted and finished at the moment, so that the operation condition is met. The installation mode and the precision of the motor bottom plate are the same as those of the speed reducer bottom plate.

2 Pre-installation of electric motor

The bottom surface of the motor and the top surface of the bottom plate are cleaned, the motor is placed on the bottom plate of the motor and is not fastened, the motor and the speed reducer are centered, and because an adjusting sizing block is not provided by an equipment manufacturer, the centering is performed according to a precise centering mode, namely, the coupler is centered, and the motor is lifted away from the bottom plate after the requirement is met.

3 secondary grouting of motor bottom plate and bolt pre-tightening

The secondary grouting and bolt pre-tightening procedures of the motor bottom plate are the same as those of the secondary grouting and bolt pre-tightening procedures of the speed reducer bottom plate.

Formal installation of 4 motor

The motor is formally mounted at a predetermined position on a motor base plate.

Coupler centering

The driving flange head and the driven flange head are installed on the driving shaft and the driven shaft, and the E value of the hub end face of the driving flange and the hub end face of the driven flange is adjusted to be consistent with the installation size.

Then, the coaxiality of the driving shaft and the driven shaft is measured and aligned, so that the radial and end face runout values of the two flanges are not more than 0.06 mm.

And then connecting the diaphragms, aligning a measuring program by adopting a three-meter alignment method, measuring the radial deviation of the shaft by using the dial indicators at the radial position, measuring the two dial indicators at the axial position, and measuring the axial deviation of the shaft.

After the measurement meets the requirements, the jigger rotates, and the phenomenon of blockage is avoided. After the requirements are met, the motor and the bottom plate are fixed by the fixing bolts.

The shaft coupling centering adopts the percentage table to measure, guarantees motor bearing and speed reducer bearing centering precision.

Speed reducer lubricating oil system installation

The speed reducer lubricating oil device is placed on the basis of the adjacent coal mill, and the expansion bolt is used for fixing the lubricating station device after meeting the requirements. And installing a pipeline between the lubricating oil station device and the speed reducer. The cooling system is connected with cooling water with the flow rate of 20m ³ /h。

Mounting sealing fan and stress-free piping

The relevant parts of the coal mill before piping are installed and accepted; the stress-free piping of the coal mill is conducted from the equipment port to the far end, and the final fixing port is reserved behind a fixing support which is close to the equipment port and is not smaller than one fixing support. Before the stress-free piping, whether the positions of the spring support and the spring hanger and the horizontal bracket are accurate or not is carefully checked. Because of coal pulverizer export flange department sets up the expansion and connects, the pipeline behind the expansion joint can directly carry out the group to the welding, because the existence of expansion joint, the pipeline installation can be neglected to the stress of coal pulverizer body, only need with the expansion joint keep to the design requirement state can.

Circulating oil flushing of lubricating oil system

The lubricating oil system 1 consists of a lubricating oil station, an intermediate connecting pipeline, a control valve and a detection instrument, wherein the lubricating oil station consists of an oil tank, an oil pump, an oil cooler, a double-cylinder filter, a three-way valve, a stop valve, various detection instruments, an oil pipeline and the like. Before the circulating oil is washed, the oil pipeline is qualified by acid washing, the cleanness of parts such as a lubricating oil tank, a double-cylinder filter, an oil cooler and the like is checked, and the parts are manually cleaned if necessary, wherein the parts are manually cleaned by adopting a surface adhesion method, the oil tank is a carbon steel oil tank on site, and the inner wall of the oil tank is not allowed to be anticorrosive. Because the length of the whole circulating oil flushing pipeline is only 11m, the circulating oil flushing is divided into two parts: and flushing with external circulating oil, flushing with internal circulating oil after the external circulating oil is qualified. When the circulating oil is flushed, the main electric oil pump and the auxiliary electric oil pump alternately operate, and the flushing oil pressure is as close to the working pressure of the system as possible. In order to improve the flushing effect of the circulating oil and shorten the flushing time, the cold and heat exchange of the oil temperature needs to be changed besides increasing the flushing oil quantity. 8 hours is taken as a circulation period, and the temperature is low and 30 ℃ is kept. The high temperature is 60 ℃, and the oil must be heated by the following steps: the oil temperature limit must not exceed 65 ℃ to avoid oil deterioration. When the oil is heated, all pipelines in contact with the oil are heated, and if some pipelines are still cold, the reason can be found and eliminated. In the washing process, the pipeline, especially the welded junction part, is knocked by a wood hammer or a rubber hammer at times, so that impurities are easy to fall off.

The screen is cleaned at least once per cycle. And cleaning the filter screen at regular time, and immediately switching and cleaning the filter screen when the specified time is not reached but the oil pressure difference between the inlet and the outlet is close to an allowable upper limit value, so as to prevent the impurities from being deposited in a dead zone and being cut by the impurities. Measures are taken to prevent the lubricating oil from leaking out when the filter screen is cleaned. The blowdown valve and the sampling valve are opened and discharged at regular time in the flushing process so as to prevent the sump oil from being properly recovered due to small pipe diameter blockage and avoid pollution and waste.

2 the step of lubricating oil circulation flushing is carried out in two stages

First-stage circulating oil flushing: the pipeline is washed, and the oil tank is subjected to three-stage filtration by an oil filter when being refueled, so that direct backward flow is not allowed. The oil-holding and oil-transporting container is used to prevent confusion with other oil containers.

1) And an 80-mesh filter screen is added at the flange position of the lubricating oil return tank.

2) The full-open pump outlet pressure control valve and the full-open three-way valve secondary line enable the lubricating oil to directly return to the oil tank, and the lubricating oil pump is started.

3) Gradually closing the oil return tank three-way auxiliary line valve, and regulating the outlet pressure of the pump to be 0.15-0.35 MPa by using a regulating valve.

4) The method comprises the steps of lubricating oil self-lubricating oil tank → lubricating oil pump → oil supply header pipe → double-cylinder filter → oil cooler → temporary oil pipeline → oil return header pipe → lubricating oil tank, knocking welding seams, elbows and tee joints by using a wooden hammer or a rubber hammer in the oil flushing process, and enabling the oil temperature to rise and fall periodically, so as to remove heavy and large impurities in the system.

5) After the oil washing is continuously operated for 2 hours, when no obvious metal particles are observed on the filter screen by eye, the 120-mesh filter screen is replaced to continue the oil washing; after the product is qualified, the 180-mesh filter screen is replaced, oil washing is continued until no metal particles are observed on the filter screen visually after 4 hours of washing, no more than 2 points of soft particles can be seen in each square centimeter or a trace amount of soft fibrous bodies is allowed to exist, and the washing can enter a second stage.

6) When a temporary pipeline connected with an oil system is connected with a formal pipeline, the temporary pipeline must be connected by a flange, before an oil pump starts to operate, a specially-assigned person needs to wait to ensure that each flange port can be observed, and once the oil pump leaks after operating, the pump should be stopped immediately. During the oil flushing, whether the pipeline has the phenomena of running, overflowing, dripping and leaking is strictly checked, and the problems are found and timely treated.

7) After oil washing begins, the oil pump is started for the first time, the operation is carried out for 10 minutes, the pump is stopped for cleaning the temporary filter screen for one time, the time for cleaning the filter screen for oil washing is gradually prolonged to 4 hours for one time according to the impurity condition, the oil pressure condition of an oil pump outlet is observed, the filter screen must be cleaned when the oil pump outlet rises to 0.05MPa, and the temporary filter screen is prevented from being broken due to too many impurities. And (3) disassembling and assembling the filter screen every time, informing the operation part in time by a construction unit, carrying out comparison work, photographing and keeping, and determining time, frequency, steps and the like according to daily records.

8) When oil is washed, the main electric oil pump and the auxiliary electric oil pump operate alternately, the washing oil pressure is as close to the working pressure of the system as possible, the oil cooler temperature control valve and the bypass are switched alternately, and the oil filter is switched alternately.

9) In the oil washing process, at the bottom of an oil tank, a filter and a pipeline low-point guide shower part, impurities are easy to precipitate, periodic discharge inspection is needed, and the collection work of lubricating oil is paid attention.

10) The secondary line is flushed by switching the pump outlet pressure control valve a minimum of 3 times during the oil flush.

11) The analysis and sampling of the lubricating oil should be carried out in the circulating flow process of the lubricating oil, the position is selected to be guided and drenched at the bottommost end of the oil tank, and meanwhile, a specially-assigned person is present. And (4) preserving the oil samples of all times by using a special bottle, and performing comparison work so as to conveniently adjust the washing step at any time.

And (3) second-stage circulating oil flushing: and (4) dismantling the temporary pipeline, connecting the formal pipeline and the reduction gearbox, and returning the lubricating oil to the lubricating oil tank flow after the lubricating oil passes through the oil station and the reduction gearbox. The oil circulation flushing specific flushing method of the second stage is performed with reference to the first stage oil transportation. And (4) qualified standard: after 4 hours of washing, no metal particles were visually observed on a 180 mesh sieve, and no more than 2 dots per square centimeter of soft particles or a trace amount of soft fiber was observed.

Single trial of motor

The driving motor is a three-phase asynchronous motor, the voltage is 10000V, the rotating speed is 983r/min, after the motor is inching, the motor is started, the continuous operation is carried out for 2 hours, and the motor is qualified without abnormality. Checking the motor running condition, checking whether the motor vibration, sound, temperature and current are abnormal every 30 minutes in the running process, recording, stopping immediately if the abnormality occurs, searching the reason, and not allowing the starting if the reason is not clear. And checking the reading of an ammeter, the starting current of the motor is not too high, the running current is required to be lower than the rated current, and the temperature of a bearing of the motor is not more than 85 ℃.

Coal mill test run

The coal mill test run comprises two parts:

1, coal mill empty load test: the bowl grinding machine mainly comprises a main motor, a speed reducer and a bowl grinding device. The main motor rotates to drive the speed reducer and the grinding bowl to rotate. The running time is required to be not less than 4 hours, the speed reducer runs normally, no lubricating oil leaks, and no abnormal sound is generated; the bowl grinding device operates stably, and the impeller device and the side machine body sealing ring are not scratched; the vibration value (double amplitude value) of the bottom plate of the coal mill is less than 0.025 mm; the vibration value (double amplitude value) of the motor bottom plate is not more than 0.1 mm; checking the temperature of the bearing of the motor, wherein the temperature of the bearing is less than 85 ℃.

2, rotating the separator to test: because the rotating speed of the rotor of the dynamic separator changes along with the coal feeding speed of the coal mill, frequency conversion test operation is required. And controlling the motor to run at different frequencies, and observing whether the running is good or not. The test run is carried out for at least 4 hours, the temperature of the upper bearing and the lower bearing needs to be detected in the test run process, when the frequency of the motor reaches 50Hz and the rotary separator and the rotor body run stably, the temperature rise of the bearing does not exceed 40 ℃, the temperature of the bearing does not exceed 80 ℃, the temperature rise of the bearing does not exceed 0.3 ℃ within half an hour, the noise at a position 1m away from the body does not exceed 85Db (A), and the timing detection and the recording are carried out.

Claims

1. A mounting and construction method of a bowl-type medium-speed coal mill is characterized by comprising the following steps:

step 1, installing a speed reducer;

arranging a sizing block according to the position of a foundation bolt on a foundation and the actual condition of a bottom plate of a reduction gearbox, and controlling the elevation by using a level gauge and the level by using a frame-type level gauge in the setting process;

mounting a speed reducer bottom plate, measuring the levelness of the speed reducer bottom plate by adopting a bridge type level bar and a frame type level meter, temporarily mounting the speed reducer in place after the levelness is adjusted to be qualified, and performing secondary grouting and bolt pre-tightening on the speed reducer bottom plate; after all the foundation bolts of the speed reducer are pre-tightened to meet the requirements, rechecking the levelness, checking the installation levelness and the surface evenness of the bottom plate, and formally installing the speed reducer in place and positioning after the rechecking of the levelness and the surface evenness of the bottom plate is qualified;

step 2, installing a side machine body;

step 4, mounting the rotary separator device;

the separator body is hung on the side machine body, the marks on the separator body and the side machine body are aligned, the separator body and the side machine body are in the same central position, and the connecting bolt of the separator body and the side machine body is screwed up according to the drawing requirement; rotating the separator rotor to place after the grinding rollers are installed, hanging the rotor onto three grinding rollers in the separator body, temporarily fixing the rotor, and lifting the rotor body to a specified position by using a driving device after the top driving device is installed; a top cover of the separator and a single outlet device are arranged,

step 5, installing a top driving device;

step 6, lifting the rotor and connecting the rotor with a top driving device;

step 7, installing a spring loading device;

step 8, installing a coal dropping pipe;

step 9, installing the motor;

the motor bottom plate is arranged after the spring loading device is arranged, the motor is placed on the motor bottom plate and is aligned with the speed reducer, the motor is lifted away from the bottom plate after the motor bottom plate is qualified, secondary grouting and bolt pre-tightening are carried out on the motor bottom plate, and the motor is formally arranged at a designated position on the motor bottom plate; after the motor is installed, centering a coupler, and measuring by adopting a dial indicator when the coupler is centered;

and step 10, installing a speed reducer lubricating oil system.

2. The mounting and construction method of the bowl-type medium speed coal mill according to claim 1, characterized in that: in the step 1, according to a longitudinal and transverse central point on a central target plate, a steel wire is pulled above a coal mill foundation, the position of a speed reducer bottom plate is adjusted to enable the speed reducer bottom plate to coincide with a steel wire cross line, and after the speed reducer bottom plate is installed, the central line of the speed reducer bottom plate is used as a datum line for subsequent unit installation.

3. The mounting and construction method of the bowl-type medium speed coal mill according to claim 1, characterized in that: step 3, the grinding bowl and the impeller are integrated, the grinding bowl and the impeller are hoisted to a specified height by a hoisting tool, the grinding bowl and the impeller are lowered, and the grinding bowl and the impeller are placed in a side machine body and are placed on a gear box; mounting the grinding bowl shell on the gear box by using a bolt; fixing the scraper device on the bowl grinding hub, spot-welding the scraper device with a fastener by using round steel, adjusting a gap between the bowl grinding scraper and the side machine body, and fixing the bowl grinding hub lining plate on the bowl grinding hub by using the fastener; and hoisting the grinding roller to the grinding roller bracket and installing the trunnion, aligning the grinding roller head with the trunnion, and fixing the grinding roller head and the trunnion together.

4. The mounting and construction method of the bowl-type medium speed coal mill according to claim 1, 2 or 3, characterized in that: and 6, cleaning a bottom flange of the top driving device connected with the rotor and an upper flange of the rotor, fixing a steel wire rope through a hanging ring on the upper part of the rotor, hoisting the rotor until the upper flange and the lower flange can be smoothly connected and the flanges are concentric, and coating a plane sealing adhesive and a screw thread anti-loosening adhesive on the joint surfaces of all the flanges and the surfaces of flange connecting bolts during installation.

5. The mounting and construction method of the bowl-type medium speed coal mill according to claim 4, characterized in that: and 7, after the spring is connected with the separator body through the bolt, vertically lifting the grinding roller hole cover to be close to the separator body door frame, and putting the grinding roller limiting pull rod into the grinding roller head groove.

6. The mounting and construction method of the bowl-type medium speed coal mill according to claim 5, characterized in that: in the step 8, the coal dropping pipe is divided into three sections, namely a coal dropping pipe, a coal dropping pipe and an upper coal dropping pipe, the coal dropping pipe is installed into two parts, the coal dropping pipe and the coal dropping pipe are connected through butt welding, the inner support is arranged through the rotor body and fixed, and the coal dropping pipe and the upper coal dropping pipe are connected through flanges.

7. The mounting and construction method of the bowl-type medium speed coal mill according to claim 6, characterized in that: in step 10, a lubricating oil device of the speed reducer is placed on the basis of the adjacent coal mill, the lubricating station device is fixed by using expansion bolts, and a pipeline between the lubricating oil station device and the speed reducer is installed.

8. The mounting and construction method of the bowl-type medium speed coal mill according to claim 7, characterized in that: circulating oil in the speed reducer lubricating oil system is added with oil by an oil filter and is filtered by a three-level filter screen.