Multifunctional stator hot jacket positioning negative pressure tool and use method thereof

Abstract

The invention belongs to the technical field of wind driven generator stator shrinkage fit, and relates to a multifunctional stator shrinkage fit positioning negative pressure tool and a use method thereof. The tool comprises a plurality of lifting appliances used for carrying out shrinkage fit assembly on the stator iron core and the machine base, and each lifting appliance is composed of a vertical plate and a bottom plate; during positioning and sleeving, a long screw is arranged in the second through hole, the lower end of the long screw is connected with the upper end surface of the stator core, a guide rod is clamped in the positioning groove, and the lower end of the guide rod is connected with the upper end surface of the base; when negative pressure fitting and sleeving are carried out, a long threaded rod is arranged in the second through hole, the lower end of the long threaded rod is connected with the upper end face of the stator core, and the positioning groove is in threaded connection with the upper end face of the machine base. Through the integrated design of the functions of the lifting appliance, the lifting appliance has the functions of lifting, sleeving guiding and negative pressure, and the investment of various tools and the frequent switching of the tools can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of the stator shrink-fitting technology of a wind turbine, and relates to a multifunctional positioning negative-pressure tooling for stator shrink-fitting and a using method thereof. Background Art

[0002] The stator of a semi-direct-drive generator mainly includes a stator core and a machine base. In the traditional shrink-fitting process, the main existing problems are as follows: First, there is a certain axial height between the upper plane of the stator core and the machine base, and it is impossible to directly guide and position during the shrink-fitting process in a narrow and deep space; Second, the specification of the threaded holes opened at the upper end of the machine base is small, and the installation of four groups of lifting rings cannot achieve the ability to lift the stator. According to the weight of the stator, a larger number of threaded holes need to be used for connection before lifting; Third, negative pressure needs to be applied after the shrink-fitting is in place, otherwise the mating surface between the stator core and the machine base is not completely fitted; Fourth, if the machine base is hoisted with multiple points concentrated at one point, it will cause radial deformation of the machine base. Summary of the Invention

[0003] The purpose of the invention is to overcome the above-mentioned shortcomings of the prior art and provide a multifunctional positioning negative-pressure tooling for stator shrink-fitting and a using method thereof.

[0004] To achieve the above purpose, the invention adopts the following technical solutions:

[0005] A multifunctional positioning negative-pressure tooling for stator shrink-fitting includes a plurality of lifting tools for shrink-fitting assembly of a stator core and a machine base. The lifting tool is composed of a vertical plate and a bottom plate. The vertical plate is connected to the upper surface of the bottom plate, and the bottom plate is perpendicular to the vertical plate; a plurality of second through holes are provided on the bottom plate, and a plurality of positioning grooves are provided on the side wall of the bottom plate;

[0006] The shrink-fitting assembly includes positioning sleeving and negative-pressure fitting sleeving in sequence; when positioning sleeving is carried out, long screws are arranged in the second through holes, the lower ends of the long screws are connected to the upper end surface of the stator core, a guide rod is clamped in the positioning groove, and the lower end of the guide rod is connected to the upper end surface of the machine base; when negative-pressure fitting sleeving is carried out, long threaded rods are arranged in the second through holes, the lower ends of the long threaded rods are connected to the upper end surface of the stator core, and the positioning groove is screwed to the upper end surface of the machine base.

[0007] Further, a fixing ring is installed on the upper end surface of the machine base, and a plurality of threaded holes and a plurality of third through holes are provided on the fixing ring.

[0008] Further, the diameter of the guide rod matches the clearance width in the positioning groove, and the lower end of the guide rod is provided with threads.

[0009] Further, when the positioning set is completed, define the distance between the upper surface of the stator core and the upper surface of the machine base as A, the length of the long screw as B, and B > A.

[0010] Further, when the negative pressure fitting set is completed, define the distance between the upper surface of the stator core and the upper surface of the machine base as C, the length of the long threaded rod as D, and D > C.

[0011] Further, a first through hole is provided at the top end of the vertical plate.

[0012] Further, a weight-reducing hole is provided in the middle of the vertical plate.

[0013] Further, the bottom plate includes a rectangular plate, a groove block is provided on the side wall of the rectangular plate, and a positioning groove is provided on the groove block.

[0014] The present invention also provides a method for using a multifunctional stator hot sleeve positioning negative pressure tooling, which specifically includes the following steps:

[0015] Step 1: After the machine base is heated, install the long screw into the second through hole, the lower end of the long screw is screwed to the upper surface of the stator core, lift the stator core, install the guide rod into the positioning groove, and screw the lower end of the guide rod into the threaded hole to complete the positioning set of the stator core and the machine base;

[0016] Step 2: Remove the long screw and the guide rod;

[0017] Step 3: Install the long threaded rod into the second through hole, screw the lower end of the long threaded rod to the upper end face of the stator core, and screw the positioning groove above the threaded hole to perform negative pressure fitting on the stator core;

[0018] Step 4: After the machine base is cooled, remove the lifting tool and the long threaded rod, and lift the stator core and the machine base after hot sleeve assembly.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] First, the present invention provides a multifunctional stator hot sleeve positioning negative pressure tooling. In the positioning set stage, each multifunctional lifting tool is connected to the stator core through a long screw, and a guide rod is installed at the corresponding position of the threaded hole at the upper end of the machine base, so that the direction during the hot sleeve process does not shift, and the hot sleeve direction can be corrected, and the positioning set can be completed; in the negative pressure fitting set stage, the long screw is removed from the second through hole, the long threaded rod is installed, the positioning groove is screwed to the upper surface of the machine base, and by screwing the nut on the lower surface of the bottom plate, a downward pressing force is generated on the stator core to ensure full fitting of the stator core and the machine base.

[0021] Second, a fixing ring is provided on the upper surface of the machine base of the present invention. After being connected by multiple groups of bolts, the lifting capacity can be enhanced. The fixing ring is provided with threaded holes of a larger specification. Only using a lifting ring can achieve the ability to lift the stator. Moreover, the use of multiple groups (preferably 4 groups) of multi-functional lifting tools is not likely to cause deformation of the stator machine base. And an inner stop is provided on the lower surface of the fixing ring, which is in small clearance fit with the inner diameter of the machine base to further prevent the machine base from deforming; the fixing ring cooperates with the multi-functional lifting tool, and compared with the threaded holes of the machine base itself, the aperture of the threaded holes of the fixing ring is increased and the number is increased, so the lifting capacity is stronger.

[0022] Third, the radial space between the stator core and the machine base is narrow. Through the integrated design of the functions of the lifting tool, the lifting tool has the functions of lifting, sleeving and guiding, and negative pressure, which can reduce the investment of various toolings and the frequent switching of toolings.

[0023] Fourth, after the machine base is heated, its pitch circle will generate radial changes during the cooling process due to the influence of the heating temperature, and different radial changes will occur at different heating temperatures. The design of the positioning groove enables it to be fully compatible during radial changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings here are incorporated into the specification and form a part of this specification, and are used together with the specification to explain the principles of the present invention.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is the overall schematic diagram of the multi-functional stator hot sleeve positioning negative pressure tooling in the present invention;

[0027] Figure 2 It is the schematic diagram of the positioning and sleeving process of the multi-functional stator hot sleeve positioning negative pressure tooling in the present invention;

[0028] Figure 3 It is the schematic diagram of the negative pressure fitting and sleeving process of the multi-functional stator hot sleeve positioning negative pressure tooling in the present invention;

[0029] Figure 4 It is the overall schematic diagram of the fixing ring in the present invention;

[0030] Figure 5 It is the schematic diagram of the lifting tool in the present invention.

[0031] Wherein: 1 is a lifting tool; 11 is a first through hole; 12 is a weight reduction hole; 13 is a second through hole; 14 is a positioning groove; 2 is a fixing ring; 21 is a threaded hole; 22 is a third through hole; 3 is a guide rod; 4 is a long screw; 5 is a long threaded rod; 6 is a stator core; 7 is a machine base; 8 is a slidable mechanism. Detailed implementation mode

[0032] Here, the exemplary embodiments will be described in detail. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present invention. On the contrary, they are merely examples consistent with some aspects of the present invention detailed in the appended claims.

[0033] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the drawings and embodiments.

[0034] Embodiment

[0035] A multifunctional stator hot sleeve positioning negative pressure tooling, as Figure 1 shown, includes a plurality of lifting tools 1 for hot sleeve assembly of the stator core 6 and the machine base 7. The lifting tool 1 is composed of a vertical plate and a bottom plate. The vertical plate is connected to the upper surface of the bottom plate, and the bottom plate is perpendicular to the vertical plate. A plurality of second through holes 13 are provided on the bottom plate, and a plurality of positioning grooves 14 are provided on the side wall of the bottom plate;

[0036] As Figures 2 - 3 shown, the hot sleeve includes a positioning sleeve and a negative pressure fitting sleeve that are carried out in sequence. When performing the positioning sleeve, a long screw 4 is arranged in the second through hole 13, the lower end of the long screw 4 is connected to the upper end surface of the stator core 6, a guide rod 3 is clamped in the positioning groove 14, and the lower end of the guide rod 3 is connected to the upper end surface of the machine base 7. When performing the negative pressure fitting sleeve, a long threaded rod 5 is arranged in the second through hole 13, the lower end of the long threaded rod 5 is connected to the upper end surface of the stator core 6, and the positioning groove 14 is screwed to the upper end surface of the machine base 7.

[0037] In this embodiment: When performing the positioning sleeve and the negative pressure fitting sleeve, a plurality of lifting tools 1 can be used. Preferably, 4 lifting tools can be used. As Figure 5 shown, a plurality of second through holes 13 are provided on the bottom plate. Preferably, two second through holes 13 can be provided on the same bottom plate, and the two second through holes 13 are respectively located on both sides of the vertical plate;

[0038] When performing negative pressure sleeving, two long screws 4 are installed in the second through hole 13 of each multi-functional lifting tool. The lower end of the long screw 4 is connected to the stator core. The machine base 7 is installed with a guide rod 3, and the guide rod 3 cooperates with the positioning groove 14 of the multi-functional lifting tool for alignment; when performing negative pressure fitting and sleeving, a long threaded rod 5 is installed in the second through hole 13, and a bolt is installed in the positioning groove 14. The bolt is connected to the fixing ring 2 of the machine base 7 through a screw, and the long threaded rod 5 cooperates with a nut to form a negative pressure.

[0039] It should be noted that as Figure 5 shown, the structure of the multi-functional lifting tool is composed of a vertical plate and a bottom plate spliced together, usually by welding or one-piece machining. The multi-functional lifting tool is provided with a first through hole 11, a second through hole 13, a weight-reducing hole 12, and a positioning groove 14. The second through hole 13 is used to install the long screw 4 or to pass through the long threaded rod 5. The positioning groove 14 is used to cooperate with the guide rod 3. During the hot sleeving process, the positioning groove 14 and the guide rod 3 play a role in circumferential positioning when the stator core falls, ensuring that the stator core does not shift and matching it with the machine base. The purpose of the weight-reducing hole 12 is to reduce the weight of the multi-functional lifting tool. After the machine base 7 is heated, the pitch circle size of the installed guide rod 3 will become larger. The positioning groove 14 is designed as an open groove, which is compatible with the changes in the radial direction of the machine base 7 and the guide rod 3, and can achieve the function of positioning and guiding before and after the machine base 7 is heated. When the stator core 6 is under negative pressure, a bolt is installed in the positioning groove 14 and connected to the machine base, and a full-threaded rod and a nut are used to form a reaction force, so that a negative pressure is formed between the stator core and the machine base. The nut torques of the circumferential full-threaded rods are consistent, and the negative pressures are also uniform.

[0040] Furthermore, as Figure 4 shown, a fixing ring 2 is installed on the upper end face of the machine base 7, and the fixing ring 2 is provided with threaded holes 21 and a third through hole.

[0041] In this embodiment: When hoisting the stator assembly, the fixing ring 2 is installed above the machine base 7. The fixing ring 2 is connected to the machine base 7 through multiple groups of bolts, and the multi-functional lifting tool is fixed to the fixing ring 2 by using the long screw 4 to hoist the stator assembly.

[0042] The structure of the fixing ring 2 is a whole-ring structure, on which multiple groups of third through holes 22 and threaded holes 21 are opened. The third through holes 22 are used to connect the bolts to the machine base 7, and the diameter of the third through hole 22 is greater than or equal to the connection hole of the machine base 7. The threaded hole 21 has two functions: First, it is used to install the guide rod 3 during positioning and sleeving, and to install screws during negative pressure fitting and sleeving, realizing the screw connection between the positioning groove 14 and the upper end face of the machine base 7. Second, the threaded hole 21 can also be used to connect a traditional lifting ring, which is convenient for hoisting and moving the stator core 6 and the machine base 7 after the hot sleeving assembly is completed, and can prevent the machine base from deforming.

[0043] Further, the diameter of the guiding rod 3 matches the clearance width in the positioning groove 14, and a thread is provided at the lower end of the guiding rod 3.

[0044] In this embodiment: One end of the guiding rod 3 is provided with an external thread matching the threaded hole of the machine base 7 or the fixing ring 2. The diameter of the guiding rod 3 matches the clearance width of the positioning groove 14 of the multifunctional sling. The guiding rod 3 is generally made of a metal material and has a certain structural strength. An elliptical angle is provided at the end of the smooth rod for contact guiding. The length of the guiding rod is greater than the length of the long screw + the length of the stator core.

[0045] Further, when the positioning sleeve is completed, the distance between the upper surface of the stator core 6 and the upper surface of the machine base 7 is defined as A, the length of the long screw 4 is defined as B, and B > A.

[0046] In this embodiment: The length of the long screw 4 is greater than the height from the upper surface of the stator core 6 to the upper surface of the machine base 7 after the hot sleeve is in place.

[0047] Further, when the negative pressure fitting sleeve is completed, the distance between the upper surface of the stator core 6 and the upper surface of the machine base 7 is defined as C, the length of the long threaded rod 5 is defined as D, and D > C. The thread diameter matches the threaded hole of the stator core 6 / fixing ring 2, and the lifting strength of multiple groups reaches the rated load of the stator weight.

[0048] In this embodiment: The length of the long threaded rod 5 is greater than the height from the upper surface of the stator core 6 to the upper surface of the machine base 7 after the hot sleeve is in place, and the thread diameter matches the threaded hole of the stator core 6.

[0049] Further, a first through hole 11 is provided at the top end of the vertical plate.

[0050] In this embodiment: The first through hole 11 is hung with a shackle and connected to the slidable mechanism 8 for lifting. The slidable mechanism 8 is a prior art.

[0051] Further, a weight-reducing hole 12 is provided in the middle of the vertical plate. The purpose of the weight-reducing hole 12 is to reduce the weight of the multifunctional sling.

[0052] Further, the bottom plate includes a rectangular plate, a groove block is provided on the side wall of the rectangular plate, and a positioning groove 14 is provided on the groove block.

[0053] The present invention also provides a method for using the multifunctional stator hot sleeve positioning negative pressure tooling based on any one of the above, specifically including the following steps:

[0054] Step 1: After heating the machine base 7, install the long screw 4 into the second through-hole 13. The lower end of the long screw 4 is screwed to the upper surface of the stator core 6. Lift the stator core 6 by hoisting, install the guide rod 3 into the positioning groove 14, and screw the lower end of the guide rod 3 into the threaded hole 21 until the positioning and sleeving of the stator core 6 and the machine base 7 are completed;

[0055] Step 2: Remove the long screw 4 and the guide rod 3;

[0056] Step 3: Install the long threaded rod 5 into the second through-hole 13, screw the lower end of the long threaded rod 5 to the upper end face of the stator core 6, and screw the positioning groove 14 above the threaded hole 21 to perform negative pressure fitting and sleeving on the stator core 6;

[0057] Step 4: After the machine base 7 cools down, remove the lifting tool 1 and the long threaded rod 5, and hoist the stator core 6 and the machine base 7 after hot sleeve assembly through the threaded hole 21.

[0058] In this embodiment: In Step 3, when installing the long threaded rod 5 into the second through-hole 13, install the nut on the lower surface of the bottom plate and adjust the nut to the required torque value; screwing the positioning groove 14 above the threaded hole 21 means that the positioning groove 14 is screwed to the threaded hole 21 and the positioning groove is located above the threaded hole 21; in Step 4, the threaded hole 21 is used to connect a traditional lifting ring to facilitate the hoisting and movement of the stator core 6 and the machine base 7 after hot sleeve assembly.

[0059] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0060] It should be understood that the present invention is not limited to the content already described above and can be modified and changed without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A multifunctional negative pressure tooling for stator hot sleeve positioning, characterized in that It includes a plurality of lifting tools (1) for thermally shrinking and assembling the stator core (6) and the machine base (7). The lifting tool (1) is composed of a vertical plate and a bottom plate. The vertical plate is connected to the upper surface of the bottom plate, and the bottom plate is perpendicular to the vertical plate. A number of second through holes (13) are provided on the bottom plate, and a number of positioning grooves (14) are provided on the side wall of the bottom plate. The thermally shrinking and assembling includes positioning and sleeving and negative pressure fitting and sleeving carried out in sequence. When positioning and sleeving, a long screw (4) is arranged in the second through hole (13), the lower end of the long screw (4) is connected to the upper end surface of the stator core (6), a guide rod (3) is clamped in the positioning groove (14), and the lower end of the guide rod (3) is connected to the upper end surface of the machine base (7). When negative pressure fitting and sleeving, a long threaded rod (5) is arranged in the second through hole (13), the lower end of the long threaded rod (5) is connected to the upper end surface of the stator core (6), and the positioning groove (14) is screwed to the upper end surface of the machine base (7).

2. The multifunctional stator hot sleeve positioning negative pressure tooling according to claim 1, wherein, A fixing ring (2) is installed on the upper end surface of the machine base (7), and a number of threaded holes (21) and a number of third through holes (22) are provided on the fixing ring (2).

3. A multifunctional stator hot sleeve positioning negative pressure tooling according to claim 1, characterized in that, The diameter of the guide rod (3) matches the clearance width of the positioning groove (14), and a thread is provided at the lower end of the guide rod (3).

4. A multifunctional stator hot sleeve positioning negative pressure tooling according to claim 1, characterized in that, Define that in the state where the positioning and sleeving is completed, the distance between the upper surface of the stator core (6) and the upper surface of the machine base (7) is A, the length of the long screw (4) is B, and B > A.

5. A multifunctional stator hot sleeve positioning negative pressure tooling according to claim 1, characterized in that, Define that in the state where the negative pressure fitting and sleeving is completed, the distance between the upper surface of the stator core (6) and the upper surface of the machine base (7) is C, the length of the long threaded rod (5) is D, and D > C.

6. A multifunctional stator hot-sheathing positioning negative pressure tooling according to claim 1, wherein, A first through hole (11) is provided at the top end of the vertical plate.

7. A multifunctional stator hot sleeve positioning negative pressure tooling according to claim 1, characterized in that, A weight-reducing hole (12) is provided in the middle of the vertical plate.

8. A multifunctional stator hot sleeve positioning negative pressure tooling according to claim 1, characterized in that The bottom plate includes a rectangular plate, and a groove block is provided on the side wall of the rectangular plate, and a positioning groove (14) is provided on the groove block.

9. The usage method of a multifunctional stator hot sleeve positioning negative pressure tooling according to any one of claims 2 to 8, characterized in that Specifically, it includes the following steps: Step 1: After the machine base (7) is heated, install the long screw (4) in the second through hole (13), thread the lower end of the long screw (4) to the upper surface of the stator core (6), lift the stator core (6), install the guide rod (3) in the positioning groove (14), and thread the lower end of the guide rod (3) into the threaded hole (21) to complete the positioning and sleeving of the stator core (6) and the machine base (7). Step 2: Remove the long screw (4) and the guide rod (3). Step 3: Install the long threaded rod (5) in the second through hole (13), thread the lower end of the long threaded rod (5) to the upper end surface of the stator core (6), screw the positioning groove (14) above the threaded hole (21), and perform negative pressure fitting and sleeving on the stator core (6). Step 4: After the machine base (7) cools down, remove the lifting tool (1) and the long threaded rod (5), and lift the thermally shrunk and assembled stator core (6) and machine base (7).

Images