Centering guide and centering method based on assembly of large motor rotor

Abstract

This invention relates to the field of motor rotor assembly technology, and particularly to a centering guide device and centering method for large motor rotor assembly. Specifically, it includes a support machine base, on which a placement assembly for clamping and multi-directionally adjusting the motor housing is mounted. An L-shaped clamp is provided with a centering column and a four-jaw chuck for rotor anti-deviation fixing. A centering correction assembly for correcting and centering the motor housing axis is mounted on the centering column. This invention achieves multi-dimensional automatic centering of the housing through four sets of synchronous internal supports, a pressure-sensing closed-loop lifting and self-aligning mechanism, and a universal floating material tray. Arc-shaped springs and contact plates are used to eliminate centering deviations caused by slot wedge interference, ensuring the coaxial accuracy of the stator and rotor. The entire process is mechanized and linked to complete housing positioning, rotor clamping, and non-contact core assembly, eliminating the need for repeated alignment operations. This reduces core impact defects, shortens the assembly cycle, and improves the yield rate and production efficiency of motor assembly.

Description

Technical Field

[0001] This invention relates to the field of motor rotor assembly technology, and in particular to a centering guide device and centering method for large motor rotor assembly. Background Technology

[0002] Large motor rotors are the core rotating power components of high-voltage, high-power industrial motors. They are mainly composed of a solid shaft with a large length-to-diameter ratio, a stacked iron core, windings or permanent magnets, and end protection structures. They are heavy, long in axial dimension, and have a high moment of inertia. During assembly, they are easily affected by their own weight, lifting stress, magnetic pull of the stator and rotor, and the wedge structure of the housing slots, which can cause eccentricity, tilting and offset. The coaxiality accuracy of their assembly directly determines the uniformity of the air gap, the risk of running vibration and rotor rubbing. Compared with small and medium-sized rotors, the process requirements for core alignment accuracy, collision-free assembly and attitude self-adaptive correction are more stringent. They are the core components with the highest precision control difficulty in the assembly of large motors.

[0003] Currently, in the core assembly of large motor rotors, slot wedge recesses are evenly distributed along the circumference of the inner wall of the motor stator housing. The traditional fixed internal support tooling blocks are rigid whole-surface structures. When the tooling is positioned, the end of the support block is very easy to be embedded in the slot wedge recesses, forming local sinking and recessed points. This causes a single support position to sink while the other points are suspended and unevenly stressed, directly causing the centering reference of the entire set of internal support tooling to shift, and causing a slight axial deviation of the clamped motor housing.

[0004] Meanwhile, conventional tooling lacks an adaptive correction mechanism for the housing posture. After the housing is loaded, the tilt caused by hoisting errors and placement deviations can only be adjusted manually by prying, and cannot be automatically leveled and corrected. Multiple factors combined cause the coaxiality error between the motor housing and the rotor axis to be assembled to exceed the limit. During the axial feeding of the rotor core, the outer circle of the rotor and the permanent magnet are very easy to bump and scrape the inner wall of the stator core. This can cause insulation damage and magnet chipping and scrapping, or even cause air gap imbalance of the whole machine. The amount of assembly rework and scrap of parts is large, which seriously drags down the assembly and processing efficiency and product yield.

[0005] To address the aforementioned technical deficiencies, a solution is proposed that aims to provide multi-dimensional automatic centering of the housing through four sets of synchronous internal supports, pressure-sensing closed-loop lifting and self-aligning mechanisms, and a universal floating material tray. Arc-shaped springs and contact plates are used to eliminate centering deviations caused by slot wedge interference, ensuring the coaxial accuracy of the stator and rotor. Summary of the Invention

[0006] The purpose of this invention is to provide a centering guide device and centering method based on the assembly of large motor rotors, in order to solve the aforementioned technical defects.

[0007] The objective of this invention can be achieved through the following technical solution: a centering guide device based on the assembly of a large motor rotor, including a support platform, on which a placement component for clamping the motor housing and having multi-directional adjustment is provided, and a center column and a four-jaw chuck for rotor anti-deviation fixing are provided through an L-shaped clamp, and a centering correction component for correcting and centering the motor housing axis is provided on the center column.

[0008] The placement assembly includes an electric lifting platform, a material placement tray, and two sets of clamping plates. The electric lifting platform is used for active adjustment of the vertical height of the motor housing axis, and the material placement tray is used for passive adjustment of the tilt and horizontal position of the motor axis.

[0009] The centering and correction assembly includes four sets of inner support plates, arc-shaped spring sheets, and abutment plates. The four sets of inner support plates are arranged parallel to each other and synchronously move away from each other to abut the inner wall of the motor housing. This is used for aligning the axis of the motor housing with the center column. The arc-shaped spring sheets combined with the abutment plates form an anti-dent multi-point support, eliminating the abutment groove wedges on the edges of the inner support plates. This results in a gap difference between each inner support plate and the inner wall of the motor housing, causing a slight offset after the axis is aligned.

[0010] Preferably, the top of the support platform is slidably connected to the L-shaped clamping platform via an installed guide rail. A fixed seat is fixedly installed on the L-shaped clamping platform, and a movable seat is slidably connected to it via the installed guide rail. The top column and the four-jaw chuck are respectively fixedly installed on the fixed seat and the movable seat, and the top column and the four-jaw chuck are coaxially arranged.

[0011] Preferably, a hydraulic cylinder one for driving the L-shaped clamping platform to move is installed on the support machine platform, a hydraulic cylinder two for driving the moving seat to move is installed on the L-shaped clamping platform, and an anti-disengagement sleeve is fitted on the free end of the top column.

[0012] Preferably, the electric lifting platform is installed on the top of the support platform, and a number of universal ball bearings are rolled on the top of the electric lifting platform. The bottom of the material tray is installed on the top of the electric lifting platform by a tension spring, and the bottom of the material tray rolls against the universal ball bearings.

[0013] Preferably, hydraulic cylinders three are installed on both sides of the electric lifting platform, and clamping plates are installed at the output ends of the hydraulic cylinders three. An elastic anti-slip pad is fixedly installed on one side of the clamping plate. Multiple guide rods that are slidably connected to the electric lifting platform are installed on the clamping plate. The oil inlet pipes of the two sets of hydraulic cylinders three are connected to each other to assist in dynamically correcting the distance difference between the piston rod end and the outer wall of the motor housing when the piston rods of the two sets of hydraulic cylinders three extend, so as to center and clamp.

[0014] Preferably, a push sleeve is slidably sleeved on the top column, a support plate is provided on one side of the inner support plate, and a connecting rod one and a connecting rod two are respectively hinged between the support plate, the push sleeve and the top column, and the connecting rod one and the connecting rod two are rotatably connected. The connecting rod one and the connecting rod two, together with the push sleeve, form a scissor lifting structure for the inner support plate, and an electric push rod for driving the push sleeve to translate is installed on the fixed seat.

[0015] Preferably, pressure sensors are installed between the inner support plates and corresponding support plates located on the upper and lower sides, and a control panel electrically connected to the pressure sensors is installed on the support machine base. The inner support plates and corresponding support plates located on the front and rear sides are fixedly connected.

[0016] Preferably, multiple equidistant abutment plates are rotatably installed on both long sides of the inner support plate. The abutment plates are formed by L-shaped butt joints between long and short sections. The two ends of the arc-shaped spring sheet are rotatably connected to the corresponding two sets of short sections. The long section abuts against the inner support plate through the natural bending elastic force of the arc-shaped spring sheet.

[0017] The alignment method based on the assembly of large motor rotors includes the following steps:

[0018] Step 1: The rotor pre-installed bearings and end caps are pre-installed onto the rotor and motor housing respectively. The motor housing is placed on the material tray. The hydraulic cylinder drives the L-shaped clamp to move, so that the center column passes through the corresponding end cap and motor housing. The four sets of internal support plates in the initial retracted state are located inside the motor housing.

[0019] Step 2: The electric push rod drives the four sets of inner support plates to expand outward and fit against the inner wall of the motor housing via connecting rod 1 and connecting rod 2. The front and rear inner support plates achieve passive centering of the motor housing. The upper and lower inner support plates, together with the corresponding pressure sensors, collect the pressure data of the contact. The pressure data difference controls the lifting of the electric lifting platform to actively center the upper and lower parts until the pressure on both sides is equal, thus completing the coaxial correction of the motor housing and the top column.

[0020] Step 3: The rotor is placed between the center post and the four-jaw chuck. The hydraulic cylinder 2 drives the moving seat to move. The four-jaw chuck clamps one end of the rotor shaft, and the other end of the rotor is limited in the anti-disengagement sleeve. The rotor shaft centering hole is pressed against the center post to achieve coaxial alignment between the rotor and the motor housing.

[0021] Step 4: When the inner support plate abuts against the inner wall of the motor housing, the arc-shaped spring sheet is pressed against the wall and drives the two sides of the abutment plate to deflect outward. The short section of the abutment plate is tensioned and locked to prevent the arc-shaped spring sheet from deforming, while the long section supports the arc-shaped spring sheet to form a multi-point anti-dent abutment, avoiding the support point from falling at the housing slot wedge, which would cause the motor housing to be misaligned and have errors in coaxial alignment.

[0022] The beneficial effects of this invention are as follows:

[0023] (1) The present invention uses four sets of synchronously radially expandable inner support plates as the internal positioning reference of the motor housing, and a floating structure of a material tray composed of bottom universal ball bearings and tension springs. It can adaptively correct the problem of the motor housing being placed crooked. The horizontal spatial posture of the housing is roughly aligned in advance. The pressure sensor on the upper and lower inner support plates is used to collect the resistance pressure data in real time. The pressure difference between the two sides is used to drive the electric lifting platform to lift and finely adjust the height. The front and rear inner support plates are synchronously expanded to realize the automatic centering of the housing. Then, the hydraulic cylinder with two connected oil circuits clamps and locks the housing shape position in three synchronous ways to achieve the centering and fixing process.

[0024] The arc-shaped spring sheet mounted on the inner support plate and the contact plate form an adaptive anti-dent support structure. The contact plate tensions and locks the arc-shaped spring sheet to avoid local dent deformation, eliminates the centering offset problem caused by the height difference of the single support caused by the slot wedge dent, and controls the coaxial error of the motor housing in all directions. This ensures that the motor housing, the center column, and the rotor are aligned during the subsequent rotor installation, effectively avoiding quality problems such as rotor scraping against the stator core, uneven air gap of the motor after assembly, and rotor rubbing during operation. This significantly improves the centering accuracy of the large motor rotor assembly and the stability of the finished product quality.

[0025] (2) The present invention also integrates the automatic alignment of the motor housing internal support, the clamping and fixing of the outer wall, the centering and clamping of the rotor, and the axial pushing assembly of the entire process of mechanized linkage operation, completely abandoning the traditional large motor assembly operation mode that relies on manual stringing and dial indicator repeated adjustment and alignment, saving the tedious process of multiple hoisting and relocation and repeated fine adjustment of the housing position.

[0026] The rotor is centered and clamped by a four-jaw chuck and protected against slippage. It is then smoothly fed into the motor housing by an L-shaped clamping platform. Throughout the process, there is no hard contact between the rotor and the housing. With the help of an external bolt robot, the end cover is automatically tightened and locked, achieving automated and collision-free assembly. The entire assembly process is seamless and avoids the probability of scrap due to collisions between the housing and rotor caused by operational errors. This not only reduces the assembly time of a single piece, but also adapts to the rapid changeover and positioning of large motor housings of various specifications, effectively improving the continuity of the production line and the efficiency of batch assembly production. Attached Figure Description

[0027] The invention will now be further described with reference to the accompanying drawings;

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the installation of the L-shaped clamp, the center column, and the four-jaw chuck of the present invention;

[0030] Figure 3 This is a schematic diagram of the installation of the centering and correction component of the present invention;

[0031] Figure 4This is a partial structural schematic diagram of the centering and correction component of the present invention;

[0032] Figure 5 This is a schematic diagram of the installation of the arc-shaped spring sheet of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of the placement component of the present invention.

[0034] Legend:

[0035] 1. Support frame; 11. L-shaped clamp; 12. Center column; 13. Four-jaw chuck; 14. Fixed base; 15. Moving base; 16. Anti-slip sleeve;

[0036] 2. Electric lifting platform; 21. Material tray; 22. Clamping plate; 23. Elastic anti-slip mat;

[0037] 3. Inner support plate; 31. Arc-shaped spring sheet; 32. Abutment plate; 33. Push sleeve; 34. Support plate; 35. Pressure sensor; 36. Control panel. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1: Please refer to Figures 1-6 As shown, the following solution addresses the problem that conventional tooling lacks an adaptive correction mechanism for the shell posture, resulting in front-to-back and height tilts due to hoisting errors and placement deviations after shell loading, which can only be finely adjusted manually by prying and cannot be automatically leveled and corrected.

[0040] The centering guide device based on the assembly of a large motor rotor in this embodiment includes a support platform 1, on which a placement component for clamping the motor housing and having multi-directional adjustment is provided, and a center post 12 and a four-jaw chuck 13 for anti-deviation fixing of the rotor are provided through an L-shaped clamp 11. A bearing is installed on the rotor shaft, and an end cover is installed on one side of the rotor shaft. The rotor is placed between the center post 12 and the four-jaw chuck 13, with the end cover side positioned on the side of the four-jaw chuck 13. The four-jaw chuck 13 abuts against one end of the rotor shaft and clamps one end of it in the center through multiple jaws. The other end of the rotor shaft is inserted into the anti-disengagement sleeve 16. Then the centering hole of the shaft abuts against the center post 12, realizing the coaxial alignment and fixing of the rotor shaft and the center post 12. A centering correction component for correcting the deviation of the motor housing shaft is provided on the center post 12.

[0041] The placement components include an electric lifting platform 2, a material tray 21, and two sets of clamping plates 22. The electric lifting platform 2 is used for active adjustment of the vertical height of the motor housing axis. The electric lifting platform 2 carries the motor housing up or down to adjust the axis height. The material tray 21 is used for passive adjustment of the tilt and horizontal position of the motor axis.

[0042] The centering and correction assembly includes four sets of inner support plates 3, arc-shaped spring pieces 31, and abutment plates 32. The four sets of inner support plates 3 are arranged parallel to each other and move in opposite directions synchronously to abut against the inner wall of the motor housing. This is used to center the axis of the motor housing and the center column 12. Through the synchronous movement of the inner support plates 3 in opposite directions, and through the parallelism of the inner support plates 3, combined with the universal joint of the material tray 21, the tilted motor housing is made parallel to the center column 12. The synchronous movement of the front and rear inner support plates 3 in opposite directions causes the motor housing to be automatically centered in the front-rear direction, thus achieving the initial positioning process of the motor housing axis being located directly below or above the axis of the center column 12.

[0043] The top of the support platform 1 is slidably connected to the L-shaped clamping platform 11 via an installed guide rail. A fixed base 14 is fixedly installed on the L-shaped clamping platform 11, and a movable base 15 is slidably connected via the installed guide rail. The center column 12 and the four-jaw chuck 13 are respectively fixedly installed on the fixed base 14 and the movable base 15, and the center column 12 and the four-jaw chuck 13 are coaxially arranged. The movable base 15 carries the four-jaw chuck 13 to move, and the rotor is clamped and positioned in conjunction with the center column 12.

[0044] A hydraulic cylinder 1 is installed on the support platform 1 to drive the L-shaped clamp 11 to move. A hydraulic cylinder 2 is installed on the L-shaped clamp 11 to drive the moving seat 15 to move. An anti-disengagement sleeve 16 is fitted on the free end of the center column 12. The anti-disengagement sleeve 16 is used to prevent the rotor from falling and hitting the ground after the center column 12 separates from one end of the rotor shaft.

[0045] The electric lifting platform 2 is installed on the top of the support platform 1, and several universal ball bearings are rolled on the top of the electric lifting platform 2. The bottom of the material tray 21 is installed on the top of the electric lifting platform 2 by a tension spring, and the bottom of the material tray 21 rolls against the universal ball bearings. Through the cooperation of the universal ball bearings and the tension spring, the universal movement of the material tray 21 is realized. Combined with four sets of synchronously radially expandable inner support plates 3 as the internal positioning reference of the motor housing, the problem of the motor housing being placed crooked can be adaptively corrected, and the rough centering of the horizontal spatial posture of the housing can be completed in advance.

[0046] Hydraulic cylinders 3 are installed on both sides of the electric lifting platform 2, and clamping plates 22 are installed on the output end of the hydraulic cylinders 3. An elastic anti-slip pad 23 is fixedly installed on one side of the clamping plate 22 to increase the anti-slip contact effect between the clamping plate 22 and the motor housing. Multiple guide rods that are slidably connected to the electric lifting platform 2 are installed on the clamping plate 22 to control the piston rods of the two sets of hydraulic cylinders 3 to extend and clamp and limit the motor housing after the up, down and back positions are adjusted.

[0047] The oil inlet pipes of the two sets of hydraulic cylinders are connected to each other. This is used to assist the piston rods of the two sets of hydraulic cylinders in dynamically correcting the distance difference between the piston rod end and the outer wall of the motor housing for centering and clamping when the piston rods of the two sets of hydraulic cylinders extend. That is, when one of the clamping plates 22 contacts the motor housing first, the clamping plate 22 is briefly stopped to avoid continuous movement causing the motor housing to be forcibly offset until the other clamping plate 22 contacts the motor housing, and then the two sides are synchronously limited and clamped.

[0048] A push sleeve 33 is slidably sleeved on the top column 12. A support plate 34 is provided on one side of the inner support plate 3. A connecting rod 1 and a connecting rod 2 are respectively hinged between the support plate 34, the push sleeve 33, and the top column 12. The connecting rod 1 and the connecting rod 2 are rotatably connected. The connecting rod 1 and the connecting rod 2, together with the push sleeve 33, form a scissor lifting structure for the inner support plate 3. An electric push rod is installed on the fixed seat 14 to drive the push sleeve 33 to move. The electric push rod drives the push sleeve 33 to move. During the movement, in conjunction with the connecting rod 1 and the connecting rod 2, it pushes the four sets of support plates 34 to carry the corresponding inner support plates 3 to move in opposite directions synchronously.

[0049] Specifically, such as Figure 3 As shown, the four sets of inner support plates 3 are labeled a, b, e, and f according to their top-bottom and front-back distribution. Taking the inner support plate 3 at position a as an example, as shown... Figure 4 As shown, the hinge points at both ends of link one are marked as A and C, and the hinge points at both ends of link two are marked as B and D. A, B, C, and D are rotatably connected to mounting blocks, and the rotation point between link one and link two is marked as E.

[0050] The mounting block at point A is slidably connected to the support plate 34; the mounting block at point C is fixedly connected to the top column 12; the mounting block at point B is fixedly connected to the push sleeve 33; and the mounting block at point D is fixedly connected to the support plate 34.

[0051] With the electric push rod limiting the fixed position of the push sleeve 33 as the reference, that is, the BC spacing is fixed, so that the three points BCE form a stable triangle structure, which indirectly causes the three points AED to form a stable triangle structure, thereby limiting the parallel setting of the support plate 34 with the axis of the inner support plate 3 and the top column 12.

[0052] During the movement of the push sleeve 33, point A moves towards point C as the active moving point. Combined with the rotation point E between connecting rod one and connecting rod two, it drives point D to rise while simultaneously pushing connecting rod one to deflect, which in turn drives point A to rise passively. During the rise, point A moves along with point B, pushing the inner support plate 3 away from the top column 12 in a parallel state. Then, combined with the passive movement of the front and rear sides of the motor housing and the active movement of the upper and lower sides, the alignment of the motor housing axis with the axis of the top column 12 is achieved.

[0053] Pressure sensors 35 are installed between the inner support plates 3 on the upper and lower sides and the corresponding support plates 34. A control panel 36 electrically connected to the pressure sensors 35 is installed on the support base 1. The inner support plates 3 on the front and rear sides are fixedly connected to the corresponding support plates 34. The pressure sensors 35 on the upper and lower inner support plates collect the contact pressure data in real time. The electric lifting platform 2 is driven to lift and finely adjust its height using the pressure difference between the two sides in a closed loop. When the pressure data on the upper side is greater than the pressure data on the lower side, the electric lifting platform 2 carries the motor housing and descends. When the pressure data on the upper side is less than the pressure data on the lower side, the electric lifting platform 2 carries the motor housing and rises until the pressure data on the upper side is equal to the pressure data on the lower side, thus completing the centering process.

[0054] Example 2: Please refer to Figures 3-5 As shown, the problem that the edge of the inner support plate is easily embedded in the groove wedge recess during positioning, forming a local sinking point, causing the single support position to sink and the other points to be suspended and unevenly stressed, directly causing the centering benchmark of the entire inner support to shift, can be solved by the following solution.

[0055] The centering and correction component in this embodiment includes four sets of inner support plates 3, arc-shaped spring pieces 31, and abutment plates 32. The four sets of inner support plates 3 are arranged in parallel to each other and move in opposite directions to abut the inner wall of the motor housing. This is used for aligning the axis of the motor housing with the center column 12. The arc-shaped spring pieces 31 combined with the abutment plates 32 form an anti-dent multi-point support, which eliminates the abutment groove wedges on the sides of the inner support plates 3, resulting in a gap difference between each inner support plate 3 and the inner wall of the motor housing, causing a slight offset after the axis is aligned.

[0056] By covering the contact area of ​​the inner wall of the motor housing with the arc-shaped spring 31, and combining the force-resistant deformation prevention of the arc-shaped spring 31, when the contact point is located in the slot wedge position, the contact point is embedded in the slot wedge, thereby eliminating the problem that the relative center point will be offset due to contact with the slot wedge, resulting in a slight offset after the axis is aligned.

[0057] Multiple equidistant abutment plates 32 are rotatably installed on both long sides of the inner support plate 3. The abutment plate 32 is formed by L-shaped docking of the long section and the short section. The two ends of the arc-shaped spring sheet 31 are rotatably connected to the corresponding two sets of short sections. The long section abuts against the inner support plate 3 through the natural bending elastic force of the arc-shaped spring sheet 31.

[0058] The arc of the arc-shaped spring piece 31 is smaller than the arc of the inner wall of the motor housing. When the arc-shaped spring piece 31 on the inner support plate 3 comes into contact with the inner wall of the motor housing, the arc-shaped spring piece 31 first deforms and fits against the inner wall of the motor housing, and causes the two sets of abutment plates 32 to deflect away from each other until the short section of the abutment plate 32 indirectly abuts against the inner wall of the motor housing.

[0059] When the short section tilts and contacts the inner wall of the housing, causing the inner support plate 3 to move further and make contact, the contact plate 32 actively deflects under force, which stretches and tightens the arc-shaped spring piece 31, forcing the arc-shaped spring piece 31 to not deform subsequently. This results in the long section contacting the arc-shaped spring piece 31 to form an anti-denting multi-point contact, limiting the contact point to the position of the groove wedge and preventing the contact point from embedding into the groove wedge.

[0060] Example 3: Please refer to Figures 1-6 As shown, the present invention also proposes an alignment method based on the assembly of large motor rotors, including the following steps:

[0061] Step 1: A bearing is installed on the rotor shaft, and two end caps are respectively installed on one side of the motor housing and one side of the rotor shaft. The motor housing is placed on the material tray 21, and the side of the end cap installed is on the same side as the fixed seat 14. The hydraulic cylinder pushes the L-shaped clamp 11 to move horizontally, so that the end of the top column 12 is inserted into the motor housing through the end cap and then passes out. Multiple retracted inner support plates 3 are located inside the motor housing.

[0062] Step 2: The electric push rod drives the push sleeve 33 to move. During the movement, in conjunction with connecting rod 1 and connecting rod 2, it pushes the four sets of support plates 34 to carry the corresponding inner support plates 3 to move in opposite directions. The four sets of inner support plates 3 are marked as a, b, e, and f according to their distribution in the upper, lower and front and back directions. Multiple inner support plates 3 successively abut against the inner wall of the motor housing. During the contact process, through multiple parallel inner support plates 3, combined with the universal movable connection of the material tray 21, the tilted motor housing is made parallel to the top column 12, and the inner support plate 3 at point e and the inner support plate 3 at point f move in opposite directions to make the motor housing automatically center and position itself in the front and back direction. The axis of the motor housing is located directly below or directly above the axis of the top column 12.

[0063] When the inner support plate 3 at point a and the inner support plate 3 at point b expand and come into contact, the pressure sensors 35 at points a and b monitor the pressure data in real time, obtain pressure data a and pressure data b, and transmit each pressure data to the controller in the control panel 36. The controller compares the pressure data a and pressure data b: if pressure data a is greater than pressure data b, it is determined that the motor housing axis is directly above the axis of the top column 12, a downward adjustment signal is generated and the electric lifting platform 2 is controlled to carry the motor housing down until pressure data a equals pressure data b, completing the alignment process between the motor housing axis and the axis of the top column 12; if pressure data a is less than pressure data b, it is determined that the motor housing axis is directly below the axis of the top column 12, an upward adjustment signal is generated and the electric lifting platform 2 is controlled to carry the motor housing up until pressure data a equals pressure data b, completing the alignment process between the motor housing axis and the axis of the top column 12.

[0064] Subsequently, the controller controls the piston rods of the two sets of hydraulic cylinders to extend and clamp and limit the motor housing after the up, down and back positions have been adjusted. Then, the electric push rod drives the push sleeve 33 to reset and move horizontally, and the four sets of inner support plates 3 retract and reset.

[0065] Step 3: Place the matching rotor between the center post 12 and the four-jaw chuck 13, with the end cover side being on the same side as the moving seat 15. The hydraulic cylinder pushes the moving seat 15 to move the four-jaw chuck 13. The four-jaw chuck 13 abuts against one end of the rotor shaft and clamps it in the center with multiple jaws. The other end of the rotor shaft is inserted into the anti-disengagement sleeve 16. Then the shaft centering hole abuts against the center post 12, completing the coaxial alignment and fixing of the rotor shaft and the motor housing.

[0066] The hydraulic cylinder pushes the L-shaped clamp 11 to move the clamped rotor horizontally, pushing the rotor into the motor housing and simultaneously completing the assembly of the end cover, motor housing and rotor. Combined with the external bolt robot, the end cover and motor housing are bolted together, realizing the entire process of non-contact assembly of the motor housing and rotor.

[0067] Step 4: During the process of the inner support plate 3 contacting the inner wall of the motor housing, the arc-shaped spring piece 31 on the inner support plate 3 contacts the inner wall of the motor housing, causing the arc-shaped spring piece 31 to deform and fit against the inner wall of the motor housing. This causes the two sets of abutment plates 32 to deflect away from each other until the short section of the abutment plate 32 indirectly abuts against the inner wall of the motor housing. The further deflection stretches the arc-shaped spring piece 31, forcing the arc-shaped spring piece 31 to not deform subsequently. When the long section abuts against the arc-shaped spring piece 31, a multi-point anti-dent abutment is formed. When the abutment point is located at the slot wedge position, the abutment point is embedded in the slot wedge, thereby eliminating the problem that a certain area of ​​a, b, e, f will be offset from the relative center point due to contact with the slot wedge, resulting in a slight offset after the axis is aligned.

[0068] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A centering and guiding device based on the assembly of a large motor rotor, characterized in that, It includes a support platform (1), on which a placement assembly for clamping the motor housing and having multi-directional adjustment is provided, and a center column (12) and a four-jaw chuck (13) for rotor anti-deviation fixing are provided through an L-shaped clamp (11), and a centering correction assembly for motor housing shaft deviation correction and alignment is provided on the center column (12). The placement components include an electric lifting platform (2), a material tray (21), and two sets of clamping plates (22). The electric lifting platform (2) is used for active adjustment of the vertical height of the motor housing axis, and the material tray (21) is used for passive adjustment of the tilt and horizontal position of the motor axis. The centering and correction assembly includes four sets of inner support plates (3), arc-shaped spring pieces (31), and abutment plates (32). The four sets of inner support plates (3) are arranged in parallel to each other and move in opposite directions to abut the inner wall of the motor housing. This is used for centering the axis of the motor housing and the top column (12). The arc-shaped spring pieces (31) combined with the abutment plates (32) form a multi-point anti-dent support, eliminating the abutment groove wedges on the sides of the inner support plates (3). This results in a gap difference between each inner support plate (3) and the inner wall of the motor housing, causing a slight offset after the axis is aligned.

2. The centering guide device based on the assembly of a large motor rotor according to claim 1, characterized in that, The top of the support platform (1) is slidably connected to the L-shaped clamp (11) via an installed guide rail. A fixed seat (14) is fixedly installed on the L-shaped clamp (11), and a movable seat (15) is slidably connected via an installed guide rail. The top column (12) and the four-jaw chuck (13) are respectively fixedly installed on the fixed seat (14) and the movable seat (15), and the top column (12) and the four-jaw chuck (13) are coaxially arranged.

3. The centering guide device based on the assembly of a large motor rotor according to claim 2, characterized in that, The support platform (1) is equipped with a hydraulic cylinder one that drives the L-shaped clamp (11) to move, the L-shaped clamp (11) is equipped with a hydraulic cylinder two that drives the moving seat (15) to move, and an anti-detachment sleeve (16) is fitted on the free end of the top column (12).

4. The centering guide device based on the assembly of a large motor rotor according to claim 1, characterized in that, The electric lifting platform (2) is installed on the top of the support platform (1), and several universal balls are rolled on the top of the electric lifting platform (2). The bottom of the material tray (21) is installed on the top of the electric lifting platform (2) by a tension spring, and the bottom of the material tray (21) rolls against the universal balls.

5. The centering guide device based on the assembly of a large motor rotor according to claim 4, characterized in that, Hydraulic cylinders are installed on both sides of the electric lifting platform (2), and clamping plates (22) are installed at the output end of the hydraulic cylinders. An elastic anti-slip pad (23) is fixedly installed on one side of the clamping plate (22). Multiple guide rods that are slidably connected to the electric lifting platform (2) are installed on the clamping plate (22). The oil inlet pipes of the two sets of hydraulic cylinders are connected to each other to assist the two sets of hydraulic cylinders in dynamically correcting the distance difference between the piston rod end and the outer wall of the motor housing when the piston rods of the two sets of hydraulic cylinders extend, so as to center and clamp.

6. The centering guide device based on the assembly of a large motor rotor according to claim 2, characterized in that, A push sleeve (33) is slidably sleeved on the top column (12). A support plate (34) is provided on one side of the inner support plate (3). A connecting rod one and a connecting rod two are respectively hinged between the support plate (34), the push sleeve (33), and the top column (12), and the connecting rod one and the connecting rod two are rotatably connected. The connecting rod one and the connecting rod two, together with the push sleeve (33), form a scissor lifting structure for the inner support plate (3). An electric push rod that drives the push sleeve (33) to translate is installed on the fixed seat (14).

7. The centering guide device based on the assembly of a large motor rotor according to claim 6, characterized in that, Pressure sensors (35) are installed between the inner support plate (3) and the corresponding support plate (34) located on the upper and lower sides. A control panel (36) electrically connected to the pressure sensor (35) is installed on the support machine base (1). The inner support plate (3) and the corresponding support plate (34) located on the front and rear sides are fixedly connected.

8. The centering guide device based on the assembly of a large motor rotor according to claim 1, characterized in that, Multiple equidistant abutment plates (32) are rotatably installed on both long sides of the inner support plate (3). The abutment plate (32) is formed by L-shaped docking of long and short sections. The two ends of the arc-shaped spring sheet (31) are rotatably connected to the corresponding two sets of short sections. The long section abuts against the inner support plate (3) through the natural bending elastic force of the arc-shaped spring sheet (31).

9. A centering method for assembling large motor rotors, employing the centering guide device for assembling large motor rotors as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: The rotor pre-installed bearings and end caps are pre-installed on the rotor and motor housing respectively. The motor housing is placed on the material tray (21). The hydraulic cylinder drives the L-shaped clamp (11) to move, so that the top column (12) passes through the corresponding end cap and the motor housing. The four sets of internal support plates (3) in the initial contracted state are located inside the motor housing. Step 2: The electric push rod drives the four sets of inner support plates (3) to expand outward and fit against the inner wall of the motor housing through the connecting rod 1 and connecting rod 2. The front and rear inner support plates (3) realize the passive centering of the motor housing. The upper and lower inner support plates (3) combine with the corresponding pressure sensors (35) to collect the pressure data of the contact. The electric lifting platform (2) is controlled to rise and fall to actively center up and down until the pressure on both sides is equal, and the coaxial correction of the motor housing and the top column (12) is completed. Step 3: The rotor is placed between the center post (12) and the four-jaw chuck (13). The hydraulic cylinder 2 drives the moving seat (15) to move. The four-jaw chuck (13) clamps one end of the rotor shaft. The other end of the rotor is limited in the anti-disengagement sleeve (16). The rotor shaft centering hole is close to the center post (12) to achieve coaxial alignment between the rotor and the motor housing. Step 4: When the inner support plate (3) touches the inner wall of the motor housing, the arc-shaped spring piece (31) is pressed against the wall and drives the two sides of the contact plate (32) to deflect outward. The short section of the contact plate (32) is tensioned and locked to prevent the arc-shaped spring piece (31) from deforming, and the long section supports the arc-shaped spring piece (31) to form a multi-point anti-dent contact, so as to avoid the support point falling at the housing slot wedge, causing the motor housing to be misaligned and the coaxial alignment to be incorrect.

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