A stator roundness measuring device and its usage method

Abstract

The invention discloses a stator circle measuring device and a method for using the same. The device comprises a supporting platform, wherein the supporting platform is installed in a stator foundation pit, a base is installed on the supporting platform, and a support is fixed on the upper end of the base; a center column is vertically arranged on the support, and the center column and the stator base are coaxially arranged; a center body is sleeved on the outer side of the center column, and the center body can be vertically lifted and lowered along the axis of the center column, and can be horizontally rotated around the axis of the center column; a measuring arm and a balancing arm are respectively arranged on both radial sides of the center body, and the measuring arm and the balancing arm are symmetrically arranged and located on the same plane; a measuring instrument is arranged on the outer end of the measuring arm, and the measuring instrument is used to obtain the reading of a measuring point to be measured; a driving motor is fixedly arranged on the base, and the output end of the driving motor is connected to one end of a transmission mechanism, and the other end of the transmission mechanism is connected to the center body; the device is easy to install and operate, utilizes a motor to drive the lifting arm to lift and lower, has good stability, high measuring accuracy, and meets the stator assembly quality requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of the stator assembly technology of hydropower turbine units, and particularly relates to a stator circle measuring device and a using method thereof. Background Art

[0002] The stator is an important component of the hydropower turbine unit and is also a main part of the magnetic circuit of the hydropower turbine unit; the roundness of the inner circle of the stator and the coaxiality with the base ring plate are essential conditions for ensuring the normal operation of the hydropower turbine unit.

[0003] Currently, during the assembly process of the stator of a hydropower turbine, due to the large inner diameter of the stator, the conventional circle measuring method in the prior art is as follows: a central column is installed on the base inside the stator, and a measuring arm is hoisted on the central column. The lifting and rotation of the measuring arm are controlled manually to complete the measurement of the inner circle of the stator; the existing stator circle measuring device used in the existing measuring method is large in volume and weight, not convenient for installation and operation, and due to manual operation, the stability of the device is poor and the measuring accuracy is low, which cannot meet the quality requirements of stator assembly, and it is extremely easy to cause damage to the device due to excessive vibration during the subsequent operation of the unit; at the same time, the hydropower turbine unit is a large-scale precision device with high cost and long manufacturing cycle. Once a failure occurs and the device is damaged, it will not only cause great economic losses, but also greatly extend the construction period. Summary of the Invention

[0004] Aiming at the technical problems existing in the prior art, the present invention provides a stator circle measuring device and a using method thereof to solve the technical problems that the existing stator inner circle measuring device is difficult to install and operate, has poor device stability and low measuring accuracy, and cannot meet the quality requirements of stator assembly.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides a stator circle measuring device, including a support platform, a base, a support, a central column, a central body, a driving motor and a transmission mechanism; the support platform is installed in the stator foundation pit, the base is installed on the support platform, and the support is fixed at the upper end of the base; the central column is vertically arranged on the support, and the central column is coaxially arranged with the stator base; the central body is sleeved outside the central column, and the central body can vertically lift along the axis of the central column and can horizontally rotate around the axis of the central column;

[0007] A measuring arm and a balance arm are respectively arranged on the radial two sides of the central body. The measuring arm and the balance arm are symmetrically arranged and are in the same plane; a measuring instrument is arranged at the outer end of the measuring arm, and the measuring instrument is used to obtain the reading of the to-be-measured measuring point; the driving motor is fixedly arranged on the base, the output end of the driving motor is connected with one end of the transmission mechanism, and the other end of the transmission mechanism is connected with the central body.

[0008] Further, the central column is of a hollow structure, and the transmission mechanism is arranged in the central column; the transmission mechanism includes a driving steel wire rope, a pulley with a hook, a lifting steel wire rope and two guiding pulleys; one end of the driving steel wire rope is connected to the hook of the pulley with a hook, and the other end is connected to the output end of the driving motor; the two guiding pulleys are symmetrically arranged at the top of the central column, the lifting steel wire rope is arranged around the pulley of the pulley with a hook, one end of the lifting steel wire rope is fixed to one side of the central body after passing around one of the guiding pulleys and extending downward, and the other end of the lifting steel wire rope is fixed to the other side of the central body after passing around the other guiding pulley and extending downward.

[0009] Further, a swing type travel switch is arranged at the upper end of the support, the swing type travel switch is arranged close to the center line of the central column, and the output end of the swing type travel switch is connected to the driving motor; a striking block is arranged at the lower end of the pulley with a hook, and the striking block is arranged on one side close to the swing type travel switch.

[0010] Further, a limiting mechanism is arranged on the guiding pulley; the limiting mechanism includes two spacer plates and a limiting rod, the two spacer plates are respectively arranged on both sides of the guiding pulley, the limiting rod is arranged between the two spacer plates, one end of the limiting rod is fixedly connected to one of the spacer plates, and the other end is fixedly connected to the other spacer plate; a steel wire rope through channel is arranged between the limiting rod and the guiding pulley, and the lifting steel wire rope is freely arranged through the steel wire rope through channel.

[0011] Further, the measuring arm includes a measuring arm body and a telescopic arm, one end of the measuring arm body is fixedly connected to the central body, the other end of the measuring arm body is fixedly connected to one end of the telescopic arm, and the other end is connected to the measuring instrument; the telescopic direction of the telescopic arm is consistent with the axial direction of the measuring arm body.

[0012] Further, the measuring instrument is a dial indicator or a micrometer.

[0013] Further, a counterweight block is arranged on the balance arm, and the counterweight block is fixed on the balance arm through a fixing clip.

[0014] Further, the base includes four base cross beams, fixed braces and a cross beam leveling mechanism; the four base cross beams are all horizontally arranged on the support platform, the four base cross beams are all perpendicular to each other and are arranged in a cross-shaped structure;

[0015] Fixed braces are arranged between adjacent two base cross beams, one end of the fixed brace is fixedly connected to one of the base cross beams, and the other end is fixedly connected to the other base cross beam; cross beam leveling mechanisms are respectively arranged at the outer extending ends of each base cross beam, one end of the cross beam leveling mechanism is connected to the outer extending end of the base cross beam, and the other end is connected to the support platform; the support is fixedly arranged at the connection node of the four base cross beams, and the lower end of the support is fixedly connected to the base cross beam through bolts.

[0016] Further, the support platform includes two platform cross beams, two platform longitudinal beams and a platform adjustment and fixing mechanism; the two platform cross beams are arranged horizontally and parallel to each other, and the two platform longitudinal beams are arranged parallel between the two platform cross beams; one end of the platform longitudinal beam is fixedly connected to one of the platform cross beams, and the other end is fixedly connected to the other platform cross beam; platform adjustment and fixing mechanisms are respectively arranged at both ends of the platform cross beam, one end of the platform adjustment and fixing mechanism is fixedly connected to the stator foundation, and the other end is fixedly connected to the platform cross beam.

[0017] The present invention also provides a method for using a stator roundness measuring device, including the following steps:

[0018] Installation stage:

[0019] Step 1: Install the support platform in the stator foundation pit, fix the base on the support platform, and sequentially install the support and the central column on the base, and ensure that the verticality of the central column and the coaxiality with the stator frame meet the design requirements;

[0020] Step 2: Sleeve the central body on the outside of the central column, and ensure that the measuring arm and the balance arm are on the same straight line;

[0021] Measurement stage:

[0022] Step 3: When calibrating the positioning bars, drive the central body to rise and fall through the driving motor, so as to drive the measuring arm to rise and fall to the required elevation for measuring the positioning bars, and make the measuring instrument at the outer end of the measuring arm fit the measuring point of the positioning bars, and complete the measurement of one measuring point; repeat the above operation to measure the measuring points on each ring of the positioning bars, adjust the positioning bars according to the measurement results, and after the positioning bars are adjusted qualified, complete the roundness measurement of the positioning bars;

[0023] Step 4: When measuring the inner circle of the stator core, use the rise and fall of the measuring arm to make the measuring instrument fit the measuring point of the inner circle of the stator core, measure one measuring point for each lamination in the circumferential direction, adjust the inner diameter of the core according to the measurement results, and after the adjustment is qualified, the roundness measurement of the inner circle of the stator core ends.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The present invention provides a stator roundness measuring device and a method for using the same. By sequentially arranging a base, a support and a center on the support platform, sleeving the central body on the outside of the central column, and arranging a measuring arm and a balance arm on the outside of the central body; through the rise and fall and rotation of the measuring arm, the inner circle of the stator is measured by using the measuring instrument; the structure is simple, the installation and operation are convenient, the lifting arm is driven by a motor to rise and fall, the stability is good, the measurement accuracy is high, and the requirements for the assembly quality of the stator are met.

[0026] Furthermore, the central column is of a hollow structure, and the transmission mechanism for controlling the lifting of the measuring arm is arranged inside the central column, reducing the weight and volume of the equipment. The axial lifting of the measuring arm is driven by a motor. Through a pulley and a steel wire rope, the central body is driven to lift axially, and then the measuring arm is driven to lift smoothly on the central column, with good stability and high measuring accuracy.

[0027] Furthermore, by setting a swinging travel switch on the support, the start and stop of the driving motor are controlled by the swinging travel switch. A bumper is provided at the lower end of the pulley with a hook. When the pulley with a hook descends to drive the measuring arm to rise, once the bumper touches the swinging travel switch, the driving motor stops running, avoiding damage to personnel and equipment caused by the measuring arm detaching from the central column due to excessive lifting.

[0028] Furthermore, a limiting device is provided outside the guiding pulley at the top of the central column, avoiding the accident risk caused by the steel wire rope placed on the pulley falling off.

[0029] Furthermore, a telescopic arm that can be telescopically extended in the radial direction is provided on the measuring arm body, and a movable counterweight block is provided on the balance arm to adjust the balance of the balance arm and the measuring arm, realizing that the length of the measuring arm can be adjusted at any time according to needs, with simple operation.

[0030] Furthermore, by setting a crossbeam leveling mechanism at the end of the base crossbeam and a platform adjusting and fixing mechanism at the end of the platform crossbeam, during the installation stage of the circle measuring equipment, the base crossbeam and the platform crossbeam are leveled by using the crossbeam adjusting mechanism and the platform adjusting and fixing mechanism respectively, improving the installation accuracy of the equipment, with a simple structure and convenient use, ensuring the accuracy of the measurement results of the circle measuring equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is the overall structural schematic diagram of the stator circle measuring equipment described in the present invention;

[0032] Figure 2 is the enlarged connection detail drawing of the base and the support platform in the present invention;

[0033] Figure 3 is the partial structural schematic diagram of the limiting device of the guiding pulley in the present invention;

[0034] Figure 4 is the plane structural schematic diagram of the support platform in the present invention;

[0035] Figure 5 is the longitudinal sectional view of the support platform in the present invention.

[0036] Among them, 1 is the support platform, 2 is the base, 3 is the support, 4 is the central column, 5 is the central body, 6 is the measuring arm, 7 is the balance arm, 8 is the driving motor; 101 is the platform cross beam, 102 is the platform longitudinal beam, 103 is the hook-shaped pressing plate, 104 is the tension bar screw, 105 is the wedge, 106 is the compression nut; 201 is the base cross beam, 202 is the fixed diagonal brace, 203 is the leveling base, 204 is the horizontal adjustment screw, 205 is the vertical adjustment screw, 206 is the shim, 207 is the horizontal sleeve; 301 is the swing type travel switch; 401 is the main wire rope, 402 is the pulley with hook, 403 is the lifting wire rope, 404 is the guide pulley, 405 is the striker, 406 is the spacer, 407 is the limit lever; 601 is the measuring arm body, 602 is the telescopic arm, 603 is the dial indicator; 701 is the counterweight block. Detailed implementation mode

[0037] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer and more understandable, the following specific embodiments are used to further elaborate on the present invention in detail. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] As shown in the attached Figures 1-5 As shown in the figure, the present invention provides a stator inner circle measuring device, which includes a support platform 1, a base 2, a support 3, a central column 4, a central body 5, a driving motor 8 and a transmission mechanism; the support platform 1 is arranged in the stator foundation pit, the base 2 is installed on the support platform 1, and the support 3 is fixed at the upper end of the base 2; the central column 4 is vertically arranged on the support 3, and the central column 4 is coaxially arranged with the stator base; the central body 5 is sleeved outside the central column 4, and the central body 5 can vertically lift along the axis of the central column 4 and can horizontally rotate around the axis of the central column 4.

[0039] On the radial two sides of the central body 5, a measuring arm 6 and a balance arm 7 are respectively arranged. The measuring arm 6 and the balance arm 7 are symmetrically arranged and are in the same plane; a measuring instrument is arranged at the outer end of the measuring arm 6, and the measuring instrument is used to obtain the reading of the measuring point to be measured; the driving motor 8 is fixedly arranged on the base 2, the output end of the driving motor 8 is connected to one end of the transmission mechanism, and the other end of the transmission mechanism is connected to the central body 5; preferably, the measuring instrument is a dial indicator 603 or a micrometer.

[0040] For the stator inner circle measuring device of the present invention, a central body that can rotate around its axis and can vertically lift along its axis is arranged on the central column. A measuring arm and a balance arm are respectively fixed on the two radial sides of the central body, realizing the rotation and vertical lifting of the measuring arm on the central column. The telescopic arm in the measuring arm is sleeved in the measuring arm body; among them, the telescopic arm can telescopically extend along the axis of the measuring arm body, that is, along the radial direction of the central body; a dial indicator 603 or a micrometer is connected to the outer end of the telescopic arm; a slidable counterweight block is installed on the balance arm through a fixed clamp, and the inner circle measurement of the stator can be realized by rotating the measuring arm and recording the reading of the dial indicator 603.

[0041] The support platform 1 includes two platform cross beams 101, two platform longitudinal beams 102 and a platform adjusting and fixing mechanism; the two platform cross beams 101 are horizontally arranged in parallel, and the two platform longitudinal beams 102 are arranged in parallel between the two platform cross beams 101; one end of the platform longitudinal beam 102 is fixedly connected to one of the platform cross beams, and the other end is fixedly connected to the other platform cross beam; platform adjusting and fixing mechanisms are respectively arranged at both ends of the platform cross beam 101, one end of the platform adjusting and fixing mechanism is fixedly connected to the stator foundation, and the other end is fixedly connected to the platform cross beam 101.

[0042] The platform adjusting and fixing mechanism includes a hook-shaped pressing plate 103, a tension bar screw 104, a wedge 105 and a compression nut 106. The tension bolt 104 is buried in the stator foundation, and the upper end of the tension bar screw 104 is exposed; one end of the hook-shaped pressing plate 103 is sleeved on the exposed end of the tension bar screw 104, and the hook-shaped pressing plate 103 and the tension bar screw 104 are fixedly connected together through the compression nut 106; the other end of the hook-shaped pressing plate 103 is fixedly connected to the end of the platform cross beam 101, and the wedge 105 is arranged between the stator foundation and the platform cross beam 101 and is directly below the connection point of the hook-shaped pressing plate 103 and the platform cross beam 101.

[0043] In the present invention, each platform cross beam includes a main support beam and two auxiliary legs. The two auxiliary legs are respectively arranged at both ends of the main support beam. The main support beam and the auxiliary legs are fixed by welding, and bolts are used for reinforcement at the weld. The wedge is arranged below the auxiliary leg; the tension screw is embedded in the concrete slab of the stator foundation; the hook-shaped pressing plate passes through the tension screw, one end is compacted with the concrete slab through a backing plate, and the other end presses on the lower part of the auxiliary leg. The main support beam and the auxiliary legs are leveled by using the wedge below the auxiliary leg; after leveling, the hook-shaped pressing plate is tightened by the compression nut located above the hook-shaped pressing plate; the assembly of each platform cross beam is completed in sequence by the above method, and the joints of the cross beams are welded firmly.

[0044] The base 2 includes four base cross beams 201, fixed diagonal braces 202 and a cross beam leveling mechanism; the four base cross beams 201 are all horizontally arranged on the support platform 1, the four base cross beams 201 are all perpendicular to each other and are arranged in a cross structure; fixed diagonal braces 202 are arranged between adjacent two base cross beams 201, one end of the fixed diagonal brace 202 is fixedly connected to one of the base cross beams, and the other end is fixedly connected to the other base cross beam; cross beam leveling mechanisms are respectively arranged at the outer extending ends of each base cross beam 201, one end of the cross beam leveling mechanism is connected to the outer extending end of the base cross beam 201, and the other end is connected to the support platform 1.

[0045] The beam leveling mechanism includes a leveling base 203, a horizontal adjustment screw 204, a vertical adjustment screw 205, a shim 206, and a horizontal sleeve 207; the leveling base 203 is arranged at the end of the base beam 201, and the bottom end of the leveling base 203 is fixedly installed on the support platform 1 by bolts; the horizontal sleeve 207 is horizontally fixed on the leveling base 203, one end of the horizontal adjustment screw 204 is inserted into the horizontal sleeve 207, and the other end is fixedly connected to the base beam 201.

[0046] The shim 206 is arranged between the base beam 201 and the support platform 1, the lower end of the shim 206 is fixed on the support platform 1, and the upper end is in close contact with the base beam 201; a vertical sleeve is arranged on the side wall of the base beam 201, and the vertical sleeve is vertically aligned with the shim 206; one end of the vertical adjustment screw 205 is inserted into the vertical sleeve, and the other end extends into the shim 206; the support 3 is fixedly arranged at the connection node of the four base beams, and the lower end of the support 3 is fixedly connected to the base beam by bolts.

[0047] In the present invention, the four base beams are arranged perpendicular to each other, and fixed diagonal braces are arranged between adjacent base beams; there are shims and adjustment screws between the end of the base beam and the platform beam of the support platform. The base is leveled by adjusting the adjustment screws. The horizontal adjustment screw gives the base beam a horizontal pressure, and the vertical adjustment screw gives the base beam a vertical force. After leveling the base by using the horizontal adjustment screw and the vertical adjustment screw, tighten and weld the horizontal adjustment screw and the vertical adjustment screw, and use the horizontal adjustment screw and the vertical adjustment screw at the end of the base to firmly connect the base and the support platform.

[0048] The central column 4 is a hollow structure, and the transmission mechanism is arranged in the central column 4; the transmission mechanism includes a driving steel wire rope 401, a hook pulley 402, a lifting steel wire rope 403, and two guiding pulleys 404; one end of the driving steel wire rope 401 is connected to the hook of the hook pulley 402, and the other end is connected to the output end of the driving motor 8; the two guiding pulleys 404 are symmetrically arranged at the top of the central column 4, the lifting steel wire rope 403 is arranged around the pulley of the hook pulley 402, one end of the lifting steel wire rope 403 is fixed to one side of the central body 5 after passing around one of the guiding pulleys 404, and the other end of the lifting steel wire rope 403 is fixed to the other side of the central body 5 after passing around the other guiding pulley 404.

[0049] The central column 4 is fixedly connected to the support 3 by hexagon socket head cap screws. A swing type travel switch 301 is provided at the upper end of the support 3. The swing type travel switch 301 is arranged close to the inner side of the central column 4. The output end of the swing type travel switch 301 is connected to the drive motor 8. A striker 405 is provided at the lower end of the hook pulley 402. The striker 405 is arranged on one side close to the swing type travel switch 301. In the present invention, by providing a swing type travel switch at the upper end of the support to control the start and stop of the drive motor, a striker is fixedly provided at the lower part of the hook pulley, which limits the axial sliding stroke range of the central body on the central column and avoids the risk of equipment damage caused by the central body detaching from the central column.

[0050] A limiting mechanism is provided on the guiding pulley 404. The limiting mechanism includes two spacer plates 406 and a limiting rod 407. The two spacer plates 406 are respectively arranged on both sides of the guiding pulley 404. The limiting rod 407 is arranged between the two spacer plates 406. One end of the limiting rod 407 is fixedly connected to one of the spacer plates, and the other end is fixedly connected to the other spacer plate. A steel wire rope through channel is provided between the limiting rod 407 and the guiding pulley 404. The lifting steel wire rope 403 freely passes through the steel wire rope through channel.

[0051] In the present invention, by providing a limiting device outside the guiding pulley, the spacers in the limiting device are fixed on both sides outside the pulley, and a limiting rod passes through the spacers at the upper part of the guiding pulley and is fastened by nuts, which restricts the movement of the lifting steel wire rope passing through the pulley and avoids the steel wire rope from falling off.

[0052] The central body 5 is sleeved on the central column 4. The two sides of the upper end of the central body 5 are connected to the output end of the drive motor 8 through a transmission mechanism. An upper cover plate is provided at the top end of the central column 4. Two guiding pulleys 404 are symmetrically fixed above the upper cover plate. The upper cover plate is slidably connected to the central column 4. The upper cover plate can rotate along the axis of the central column 4 and rotate coaxially with the central body 5. A locking structure is further provided between the upper cover plate and the central column 4 for locking and fixing the upper cover plate and the central column 4 during the vertical lifting process of the central body to ensure that the upper cover plate and the central body remain relatively stationary during the lifting process of the central body.

[0053] In the present invention, by slidably connecting the upper cover plate and the central column, the mutual winding of the lifting steel wire ropes during the measurement process, that is, the rotation process of the central body 5 along the axis of the central column 4, is avoided, ensuring the safety and accuracy of the measurement process. By providing a locking structure between the upper cover plate and the central column, relative rotation between the central body and the central column is ensured during the lifting process, improving the stability of the structure.

[0054] The lifting steel wire rope 403 passes through two guiding pulleys 404 and the hook pulley 402 respectively, and is connected to the central body 5 at both ends. The hook of the hook pulley 402 is connected to the driving steel wire rope, and the other end of the driving steel wire rope is connected to the driving motor fixed on the base. Thus, the driving motor drives the central body 5 to slide up and down along the central column 4. The inside of the central column 4 is hollow, and the hook pulley 402 and most of the lifting steel wire ropes are arranged inside the central column 4, greatly reducing the weight and volume of the stator roundness measuring device.

[0055] The measuring arm 6 includes a measuring arm body 601 and a telescopic arm 602. One end of the measuring arm body 601 is fixedly connected to the central body 5, one end of the other end of the measuring arm body 601 is fixedly connected to one end of the telescopic arm 602, and the other end is connected to the measuring instrument. The telescopic direction of the telescopic arm 602 is consistent with the axis direction of the measuring arm body 601.

[0056] A counterweight block 701 is arranged on the balance arm 7, and the counterweight block 701 is fixed on the balance arm 7 through a fixing clip.

[0057] The present invention also provides a using method of the stator roundness measuring device, including the following steps:

[0058] Step 1: Install a support platform in the stator foundation pit, fix the base on the support platform, and sequentially install the support and the central column on the base, and ensure that the verticality of the central column and the coaxiality with the stator frame meet the design requirements.

[0059] Step 2: Sleeve the central body on the outside of the central column, ensure that the measuring arm and the balance arm are on the same straight line, and complete the installation work of the stator roundness measuring device.

[0060] Step 3: When calibrating the positioning ribs, drive the central body to lift and lower through the driving motor to drive the measuring arm to lift and lower to the required elevation for measuring the positioning ribs, and make the measuring instrument at the outer end of the measuring arm fit the measuring point of the positioning ribs to complete the measurement of one measuring point. Repeat the above operation to measure the measuring points on each ring of the positioning ribs, adjust the positioning ribs according to the measurement results, and complete the roundness measurement of the positioning ribs after the positioning ribs are adjusted qualified.

[0061] Step 4: When measuring the inner circle of the stator core, use the lifting of the measuring arm to make the measuring instrument fit the measuring point of the inner circle of the stator core, measure one measuring point for each punching sheet in the circumferential direction, adjust the inner diameter of the core according to the measurement results, and end the roundness measurement of the inner circle of the stator core after the adjustment is qualified.

[0062] Working principle

[0063] Installation stage:

[0064] The invention discloses a stator circle measuring device, which is applied to the circle measuring of the inner cavity of the stator assembly of a hydropower station building, wherein the base is fixed on a supporting platform, and the center of the center column of the stator circle measuring device is finely adjusted; four measuring points which are conducive to measuring symmetry are selected on a ring plate of the base as reference measuring points for checking and monitoring the coaxiality between the base and the center column, and the actual size between the reference points and the center column is measured with an inside micrometer, and recorded; in the invention, the coaxiality between the center column and the stator base should be no greater than 1 mm; the verticality of the center column measured in the horizontal and vertical directions should be no greater than 0.02 mm / m; after the center column is adjusted to be qualified, the base is fixed by symmetrical spot welding to the lower supporting platform.

[0065] Put the center body on the center column, fix the measuring arm and the balancing arm at the radial ends of the center body respectively, and ensure that the measuring arm and the balancing arm are on the same horizontal line; rotate the measuring arm for one circle, and use the dial indicator 603 or micrometer at the outer end of the telescopic arm to measure the same point. The error should not be greater than 0.02mm.

[0066] After the center body is installed, use an outside micrometer to measure the actual size of the center column outer circle and make a record as an important parameter for re-testing the verticality of the center column and the coaxiality with the stator frame. Before checking at each installation stage, the verticality of the center column and the coaxiality with the frame must be re-measured. If there is any change, the cause should be found in time and readjusted, and then checked again after passing the inspection.

[0067] Measurement phase:

[0068] When calibrating the locating ribs, the measuring arm is driven up and down by the driving motor to reach the required elevation for measuring the locating ribs. The measuring arm is then rotated and the telescopic arm is pulled to make the dial indicator or micrometer fit the measuring point to complete the measurement of one point. Three points are measured in each ring and records are kept.

[0069] Use the above method to take measuring points on each ring of the locating rib in turn to complete the circle measurement of the locating rib; the radius deviation of the locating rib is required to not exceed -0.05~+0.30mm, and the difference in adjacent radii of the same ring is less than 0.25mm; after the locating rib is adjusted to meet the requirements, all the locating rib support blocks are lap welded to the machine base ring plate.

[0070] When measuring the inner circle of the stator core, use the measuring arm to lift and rotate and the telescopic arm to extend and retract, so that the dial indicator or micrometer fits the measuring point. Take one point for measurement on each punching sheet in the circumferential direction. The inner diameter deviation of the stator core is required to be no more than -0.8mm~+1.2mm, and the roundness is no more than 0.8mm. After qualified adjustment, the circle measurement is completed and the core is finally tightened.

[0071] In the present invention, the measuring arm is lifted and lowered by a motor drive, eliminating the need for manual pushing, simplifying the measurement process, and having better stability compared to manual pushing, thus solving the problem of low measurement accuracy of the stator roundness measuring equipment. By providing a telescopic arm on the measuring arm, the stator roundness measuring equipment can arbitrarily adjust the measurement radius, and the same equipment can be used for measuring the positioning ribs and the roundness of the stator core. There is no need to reassemble the equipment during the process, making the operation more convenient and greatly shortening the construction period.

[0072] In the present invention, the inside of the central column is made hollow, and the lifting steel wire rope, pulley, etc. included in the transmission mechanism are arranged inside the central column, greatly reducing the volume and weight of the stator roundness measuring equipment, making the installation more convenient and the cost lower. At the same time, since the transmission mechanism is built inside the central column, the stroke range of the measuring arm is increased, enabling a wider measurement range and being able to adapt to more stator assemblies, with better economic benefits.

[0073] The stator roundness measuring equipment described in the present invention includes a support platform of the equipment and a support above the support platform. The upper part of the support is connected to the central column. A central body that can slide up and down and rotate along the central column is sleeved on the central column. Balance arms and measuring arms are respectively provided at both radial ends of the central body. A dial indicator or a micrometer is installed at the outer end of the measuring arm. The inner circle of the stator is measured by rotating the measuring arm and recording the readings of the dial indicator. The inner circle of the stator is measured by lifting and rotating the measuring arm and recording the readings of the dial indicator. It has a simple structure, is easy to use, has high measurement accuracy, ensures the roundness of the inner cavity and the coaxiality of each component during the stator assembly process, solves the problem that the prior art cannot meet the stator assembly accuracy requirements, eliminates the risk of equipment damage caused by unqualified stator assembly quality, and has strong operability and applicability.

[0074] The axial lifting of the measuring arm depends on the drive of a motor. The motor is fixed on the support platform and connected to the active steel wire rope. One end of the active steel wire rope is connected to the motor, and the other end is connected to a hook with a hook pulley. A cover plate is provided at the top of the central column, and a guiding pulley is provided on the cover plate. The lifting steel wire rope passes through the guiding pulley and the pulley with the hook pulley respectively, and is connected to the central body at both ends. The axial lifting of the measuring arm depends on the drive of the motor. The central body is driven to lift axially through a pulley block and a steel wire rope, and then drives the measuring arm to lift smoothly on the central column, with good stability and high measurement accuracy. A swing type travel switch is fixed on the upper part of the support to control the start and stop of the motor, and a bumper is provided under the hook pulley. A limiting device is provided outside the pulley on the upper cover plate of the central column. A limiting device is provided outside the pulley on the upper cover plate of the central column, avoiding the accident risk caused by the steel wire rope placed on the pulley falling off.

[0075] The above embodiments are merely one of the implementation manners capable of implementing the technical solution of the present invention. The scope of protection required by the present invention is not limited solely by this embodiment, but also includes any changes, substitutions, and other implementation manners that are readily conceivable by any person skilled in the art within the technical scope disclosed by the present invention.

Claims

1. A method for using a stator circle measuring device, characterized in that, the stator circle measuring device includes a support platform, a base, a support, a central column, a central body, a driving motor and a transmission mechanism; the support platform is installed in the stator foundation pit, the base is installed on the support platform, and the support is fixed at the upper end of the base; the central column is vertically arranged on the support, and the central column is coaxially arranged with the stator base; the central body is sleeved outside the central column, and the central body can vertically lift along the axis of the central column and can horizontally rotate around the axis of the central column; on the radial two sides of the central body, a measuring arm and a balancing arm are respectively arranged, the measuring arm and the balancing arm are symmetrically arranged and are in the same plane; a measuring instrument is arranged at the outer end of the measuring arm, and the measuring instrument is used to obtain the reading of the measured point to be measured; the driving motor is fixedly arranged on the base, the output end of the driving motor is connected with one end of the transmission mechanism, and the other end of the transmission mechanism is connected with the central body; the support platform includes two platform cross beams, two platform longitudinal beams and a platform adjusting and fixing mechanism; the two platform cross beams are horizontally arranged in parallel, and the two platform longitudinal beams are arranged in parallel between the two platform cross beams; one end of the platform longitudinal beam is fixedly connected with one of the platform cross beams, and the other end is fixedly connected with the other platform cross beam; platform adjusting and fixing mechanisms are respectively arranged at both ends of the platform cross beam, one end of the platform adjusting and fixing mechanism is fixedly connected with the stator foundation, and the other end is fixedly connected with the platform cross beam; the platform adjusting and fixing mechanism includes a hook-shaped pressing plate, a tension bar screw, a wedge iron and a pressing nut, the tension bar screw is buried in the stator foundation, and the upper end of the tension bar screw is exposed; one end of the hook-shaped pressing plate is sleeved on the exposed end of the tension bar screw, and the hook-shaped pressing plate and the tension bar screw are fixedly connected together through the pressing nut; the other end of the hook-shaped pressing plate is fixedly connected with the end of the platform cross beam, and the wedge iron is arranged between the stator foundation and the platform cross beam and is arranged directly below the connection point of the hook-shaped pressing plate and the platform cross beam; the method for using the stator circle measuring device includes the following steps: Installation stage: Step 1. Install the support platform in the stator foundation pit, fix the base on the support platform, and successively install the support and the central column on the base, and ensure that the verticality of the central column and the coaxiality with the stator frame meet the design requirements; Step 2. Sleeve the central body outside the central column, and ensure that the measuring arm and the balancing arm are on the same straight line; Measurement stage: Step 3. When calibrating the positioning bars, drive the central body to lift through the driving motor, so as to drive the measuring arm to lift to the required elevation for measuring the positioning bars, and make the measuring instrument at the outer end of the measuring arm fit with the measuring point of the positioning bars, and complete the measurement of one measuring point; repeat the above operation to complete the measurement of the measuring points on each ring of the positioning bars; adjust the positioning bars according to the measurement results, and after the positioning bars are adjusted qualified, complete the circle measurement of the positioning bars; Step 4. When measuring the inner circle of the stator core, use the lifting of the measuring arm to make the measuring instrument fit with the measuring point of the inner circle of the stator core, measure one measuring point for each punching sheet in the circumferential direction, adjust the inner diameter of the core according to the measurement results, and after the adjustment is qualified, the circle measurement of the inner circle of the stator core ends.

2. According to the method for using a stator circle measuring device described in claim 1, characterized in that, The central column is of a hollow structure, and the transmission mechanism is arranged in the central column; the transmission mechanism includes a driving wire rope, a pulley with a hook, a lifting wire rope and two guiding pulleys; one end of the driving wire rope is connected to the hook of the pulley with a hook, and the other end is connected to the output end of the driving motor; the two guiding pulleys are symmetrically arranged at the top of the central column, the lifting wire rope is arranged around the pulley of the pulley with a hook, one end of the lifting wire rope is fixed to one side of the central body after passing around one of the guiding pulleys and extending downward, and the other end of the lifting wire rope is fixed to the other side of the central body after passing around the other guiding pulley and extending downward.

3. The method for using a stator roundness measuring device according to claim 2, characterized in that, a swing type travel switch is arranged at the upper end of the support, the swing type travel switch is arranged close to the center line of the central column, and the output end of the swing type travel switch is connected to the driving motor; a striking block is arranged at the lower end of the pulley with a hook, and the striking block is arranged on one side close to the swing type travel switch.

4. The method for using a stator roundness measuring device according to claim 2, characterized in that, a limiting mechanism is arranged on the guiding pulley; the limiting mechanism includes two spacer plates and a limiting rod, the two spacer plates are respectively arranged on both sides of the guiding pulley, the limiting rod is arranged between the two spacer plates, one end of the limiting rod is fixedly connected to one of the spacer plates, and the other end is fixedly connected to the other spacer plate; a wire rope through channel is arranged between the limiting rod and the guiding pulley, and the lifting wire rope freely passes through the wire rope through channel.

5. The method for using a stator roundness measuring device according to claim 1, characterized in that, the measuring arm includes a measuring arm body and a telescopic arm, one end of the measuring arm body is fixedly connected to the central body, the other end of the measuring arm body is fixedly connected to one end of the telescopic arm, and the other end is connected to the measuring instrument; the telescopic direction of the telescopic arm is consistent with the axis direction of the measuring arm body.

6. The method for using a stator roundness measuring device according to claim 1, characterized in that, the measuring instrument is a dial indicator or a micrometer.

7. The method for using a stator roundness measuring device according to claim 1, characterized in that, a counterweight block is arranged on the balance arm, and the counterweight block is fixed on the balance arm through a fixing clamp.

8. The method for using a stator roundness measuring device according to claim 1, characterized in that, the base includes four base cross beams, fixed braces and a cross beam leveling mechanism; the four base cross beams are all horizontally arranged on the support platform, the four base cross beams are all perpendicular to each other and are arranged in a cross-shaped structure; fixed braces are arranged between adjacent two base cross beams, one end of the fixed brace is fixedly connected to one of the base cross beams, and the other end is fixedly connected to the other base cross beam; cross beam leveling mechanisms are respectively arranged at the outer extending end parts of each base cross beam, one end of the cross beam leveling mechanism is connected to the outer extending end part of the base cross beam, and the other end is connected to the support platform; the support is fixedly arranged at the connection node of the four base cross beams, and the lower end of the support is fixedly connected to the base cross beam through bolts.

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