Stator coil extraction tool and method of use thereof

Abstract

The application relates to the technical field of mechanical processing maintenance, in particular to a stator coil taking-out tool and a using method thereof. The stator coil taking-out tool comprises a threaded long rod, a tension ring sleeved on the threaded long rod, two conical plugging pieces, a hand hammer, a first threaded fastener and a second threaded fastener which are respectively screwed and fixed at two ends of the threaded long rod. The tension ring is a hollow tubular structure, a plurality of saw cuts are formed at opposite ends of the tension ring along the axial direction, and the two ends of the tension ring are formed into petal-shaped structures which can expand along the radial direction. The two conical plugging pieces are respectively arranged at the opposite ends of the tension ring, the conical surfaces of the two conical plugging pieces are respectively arranged opposite to the petal-shaped structures at the opposite ends of the tension ring, and the center of each conical plugging piece is provided with a first through hole along the axial direction. The center of the hand hammer is provided with a second through hole along the axial direction, and the hand hammer is located outside one of the conical plugging pieces. The stator coil taking-out tool solves the problems that the existing taking-out mode is time-consuming and laborious, irreversible damage to the stator original element is caused, the maintenance cost is high, and the cycle is long.

Description

Technical Field

[0001] This application relates to the field of mechanical processing and maintenance technology, and in particular to a stator coil removal tool and its usage method. Background Technology

[0002] The spindle of a machining center has a stator coil inside, commonly known as a "coil". It is essentially a motor stator winding, including the motor coil built into the electric spindle, the servo motor coil, the spindle or feed system drive unit coil, etc., and is the core electrical component for power transmission.

[0003] In practical use, stator coils often experience short circuits, grounding faults, etc. due to overheating, insulation damage, mechanical stress, improper installation or maintenance, which can cause machine tool alarms, drive reports "overcurrent fault" or "grounding fault", or the motor cannot start. In this case, the damaged stator coil needs to be removed from the spindle housing, and then a multimeter is used to measure the stator coil to find that it is short-circuited, and then it can be replaced or repaired.

[0004] However, when disassembling the damaged stator components, the stator coils are tightly attached to the main shaft, and maintenance personnel cannot remove them by hand alone. They can only break the coil windings, then use an iron wire to fix the copper wire windings, and then use force to pull the stator out.

[0005] This method is not only time-consuming and labor-intensive, requiring several hours or even more than half a day for a single disassembly, but also involves violent demolition, resulting in high labor intensity. Furthermore, the use of violent pulling and demolition directly causes irreversible damage to the stator components, making them unrepairable and requiring replacement. This leads to high maintenance and replacement costs, long cycles, and production delays. In addition, the uncontrollable direction of force during the pulling process can easily scratch the inner wall of the spindle, damage bearings or cooling channels, and pose a risk of damaging other precision components. Summary of the Invention

[0006] The purpose of this application is to provide a stator coil removal tool and its usage method to solve the technical problems of existing removal methods being time-consuming and laborious, causing irreversible damage to the stator components that cannot be repaired and reused, resulting in high maintenance costs and long maintenance cycles.

[0007] In a first aspect, this application provides a stator coil removal tool, comprising: The threaded rod and a tensioning ring sleeved on the threaded rod, two conical sealing parts, a hand hammer, and a first threaded fastener and a second threaded fastener respectively tightened and fixed at both ends of the threaded rod. The first threaded fastener is used to lock and fix the conical sealing part located at one end of the threaded rod, and the second threaded fastener is used to block the hand hammer to prevent it from slipping out of the threaded rod. The tensioning ring is a hollow tubular structure with multiple saw cuts at its two opposite ends along the axial direction, so that its two ends form a petal-shaped structure that can expand radially. The two conical sealing members are respectively placed at opposite ends of the tensioning ring, and each conical sealing member has a first through hole axially opened at its center for the threaded rod to pass through, and the conical surfaces of the two conical sealing members are respectively arranged opposite to the petal-shaped structures at opposite ends of the tensioning ring; The hammer has a second through hole along the axial direction at its center for the threaded rod to pass through, located on the outside of one of the tapered plugs.

[0008] Furthermore, there is a gap between the outer diameter of the tensioning ring and the inner diameter of the stator coil to be removed, the gap being at least 1 mm.

[0009] Furthermore, each of the saw cuts opened at the end of the tensioning ring is an elongated strip extending in the axial direction, and the saw cuts at the same end on the same side are evenly spaced circumferentially.

[0010] Furthermore, the length of each of the saw cuts is less than or equal to half the length of the tensioning ring; and / or The saw cuts on one end of the tensioning ring and the saw cuts on the other end are staggered in the circumferential direction.

[0011] Furthermore, the conical sealing member includes a cylindrical segment and a frustum segment connected sequentially along the axial direction. The frustum segment is the conical surface provided by the conical sealing member, and the cross-sectional dimension of the frustum segment gradually decreases in the direction away from the cylindrical segment.

[0012] Furthermore, the diameter of the end face of the frustum segment is the minimum cross-sectional dimension of the frustum segment, and the diameter of the position where the frustum segment meets the cylindrical segment is the maximum cross-sectional dimension of the frustum segment and is equal to the diameter of the cylindrical segment. The cross-sectional dimension of the end face of the frustum segment is smaller than the inner diameter of the petal-shaped structure at the end of the tensioning ring in its unexpanded state, and the diameter of the cylindrical segment is larger than the inner diameter of the petal-shaped structure at the end of the tensioning ring in its unexpanded state.

[0013] Furthermore, the stator coil removal tool also includes a third threaded fastener, which is screwed and slidably sleeved on the threaded rod and placed between the hammer and the conical plug adjacent to the hammer.

[0014] Furthermore, the first and third threaded fasteners are screws, and the second threaded fastener is a nut; and / or The distance between the second threaded fastener and the conical plug adjacent to the hammer is greater than the axial length of the hammer; and / or The outer diameter of the second threaded fastener is larger than the diameter of the second through hole of the hammer.

[0015] Furthermore, the material density of the hammer is greater than that of steel; and / or The hammer has two disc-shaped structures at opposite ends and an arc-shaped structure in the middle that transitions to the two disc-shaped structures at the ends. The arc-shaped structure is configured as a grip. The arc-shaped structure includes two transition arc-shaped structures at both ends that are respectively connected to the two disc-shaped structures, and a convex arc-shaped structure in the middle section that is connected to the two transition arc-shaped structures. The highest point of the convex arc-shaped structure is higher than the lowest point of the transition arc-shaped structure, and the convex arc-shaped structure is located inside the periphery of the disc-shaped structure.

[0016] Secondly, this application provides a method for using a stator coil removal tool, employing any one of the aforementioned stator coil removal tools, the method comprising: S100 Assembly steps: First, put the tensioning ring on the threaded rod. Then, put the two conical sealing parts on the threaded rod along the opposite direction of the conical surface and place them at opposite ends of the tensioning ring. Then, tighten the first threaded fastener to one end of the threaded rod to fix one of the conical sealing parts. Then, slide the hammer into the threaded rod from the other end and put it on the threaded rod. Then, tighten the second threaded fastener at the end of the threaded rod near the hammer to prevent the hammer from coming out. S210, Insertion Step: Insert the assembled stator coil removal tool into the internal cavity of the stator coil, and position the tensioning ring at the corresponding axial position on the inner wall of the stator coil; S220, Tightening step: Push the conical sealing member close to the hand hammer forward along the axial direction of the tensioning ring, so that the conical surface of the conical sealing member is gradually pushed into the petal-shaped structure formed by each saw cut on the end side of the tensioning ring, which can expand radially outward, and continue to push and tighten, so that the tensioning ring expands continuously until it is tightly attached to the inner wall of the stator coil; S230, Removal Step: Quickly pull the hammer backward to make it strike the second threaded fastener fixed to the end of the threaded rod behind it. Use the inertial force and reaction force generated by the impact to gradually pull the stator coil out along the axial direction, thus completing the non-destructive removal of the stator coil from the main shaft.

[0017] Compared with the prior art, the stator coil removal tool and its usage method provided in this application include a threaded rod and a tensioning ring sleeved on the threaded rod, two conical sealing parts, a hammer, and a first threaded fastener and a second threaded fastener respectively tightened and fixed at both ends of the threaded rod. The first threaded fastener is used to lock and fix the conical sealing part (such as the first conical sealing part) located at one end of the threaded rod, and the second threaded fastener is used to block the hammer and prevent it from slipping out of the threaded rod. The threaded rod plays the role of connecting the entire tool and fixing and tightening it.

[0018] The tensioning ring is a hollow tubular structure that can be directly fitted onto a threaded rod along the axial direction. Multiple slits are provided at opposite ends of the tensioning ring along the axial direction, forming radially expandable petal-like structures at both ends. Two conical sealing elements are fitted onto the threaded rod through first through holes opened axially at their respective centers, and are positioned at opposite ends of the tensioning ring. The conical surfaces of the two sealing elements are aligned with the petal-like structures at opposite ends of the tensioning ring. A first threaded fastener is tightened and fixed to one end of the threaded rod to secure one of the conical sealing elements (e.g., the first conical sealing element). The hammer slides through a second through hole axially provided at its center and onto the threaded rod from the other end (away from the first threaded fastener), positioning the hammer outside another conical plug (such as a second conical plug). A second threaded fastener is then tightened on the end of the threaded rod near the hammer to prevent the hammer from coming off the threaded rod. This completes the assembly of the stator coil removal tool.

[0019] When it is necessary to use the stator coil removal tool to remove the stator coil (i.e., the coil) from the spindle, insert the assembled stator coil removal tool into the internal cavity of the stator coil, and push the conical sealing member (such as the second conical sealing member) close to the hand hammer along the axial direction towards the tension ring. (Alternatively, tighten a third threaded fastener at this location and then tighten the third threaded fastener forward to push the conical sealing member.) Gradually push the conical surface of the sealing member into the radially outward-moving kerf formed by the saw cuts on the end side of the tension ring. In the expanding petal structure, after being pushed and tightened, the serrated end begins to expand outward and towards the inner wall of the stator coil. During the pushing and tightening process, the tensioning ring continuously expands and fits tightly against the inner wall of the stator coil. At this point, a hammer is pulled backward, causing it to strike the blocking surface of the second threaded fastener fixed to the end of the threaded rod behind it. Using inertia and reaction force, the stator coil is slowly pulled out, thus completing the non-destructive removal of the stator coil from the spindle. This process does not damage the stator coil, nor does it damage or interfere with other structural components inside the spindle.

[0020] With this design, the stator removal tool can remove the stator coil from the spindle in a non-destructive, efficient, and labor-saving manner. This not only prevents damage to the stator coil, allowing for its reuse and significantly reducing maintenance costs, but also greatly shortens maintenance time without affecting production schedules. Furthermore, the removal process will not damage or interfere with other structural components within the spindle. Moreover, the stator coil removal tool has a simple overall structure, making it easy to assemble and disassemble. The method of using this tool to remove the stator coil is also simple and easy to operate; the entire process can be completed by a single person, saving time and effort and reducing labor costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the tensioning ring provided in the embodiments of this application; Figure 2 This is a schematic diagram of the axial section of the tensioning ring provided in the embodiments of this application; Figure 3 This is a schematic diagram of the end face of the tensioning ring provided in an embodiment of this application; Figure 4 This is a schematic diagram of the axial section of the tapered sealing member provided in the embodiments of this application; Figure 5 This is a schematic diagram showing the dimensions of the conical sealing component provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the hand hammer provided in an embodiment of this application; Figure 7 This is a schematic diagram showing the dimensions of the hand hammer provided in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of the threaded long rod provided in the embodiment of this application.

[0023] Figure label: 10-Threaded long rod; 20-Tightening ring; 21-Saw cut; 211 - First strip saw cut; 212 - Second strip saw cut; 30 - Conical sealing element; 31 - First through hole; 32-Frustum section; 33-Cylindrical segment; 40-Hand hammer; 41 - Second through hole; 42-Disc-like structure; 43 - Handshake area; 431 - Transition arc surface structure; 432 - Convex arc structure. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] like Figures 1 to 8 As shown, this application embodiment provides a stator coil removal tool and a method for using the stator coil removal tool, so as to remove the stator coil (i.e., coil) in the spindle in a non-destructive, efficient and labor-saving manner.

[0032] like Figures 1 to 8 As shown in the embodiment of this application, the stator coil removal tool includes: a threaded rod 10 and a tensioning ring 20 sleeved on the threaded rod 10, two conical sealing members 30, a hand hammer 40, and a first threaded fastener and a second threaded fastener respectively tightened and fixed at both ends of the threaded rod 10. The first threaded fastener is used to lock and fix the conical sealing member 30 (such as the first conical sealing member) located at one end of the threaded rod 10. The second threaded fastener is used to block the hand hammer 40 from slipping out of the threaded rod 10. Specifically, the outer diameter of the second threaded fastener is larger than the diameter of the second through hole 41 of the hand hammer 40 to effectively prevent the hand hammer 40 from coming out of the threaded rod 10. The threaded rod 10 plays the role of connecting the entire stator coil removal tool in series and fixing and tightening it.

[0033] like Figures 1 to 3 As shown, the tensioning ring 20 is a hollow tubular structure with multiple saw cuts 21 on its opposite ends along the axial direction (as shown in the figure), so that the two ends of the tensioning ring 20 form a petal-shaped structure that can expand radially. Specifically, the tensioning ring 20 can be directly fitted onto the threaded rod 10 along the axial direction.

[0034] like Figure 4 and Figure 5As shown, the center of each of the two conical sealing members 30 is provided with a first through hole 31 along the axial direction for the threaded rod 10 to pass through. Each of the two conical sealing members 30 can be sleeved on the threaded rod 10 through the first through hole 31 opened along the axial direction at their respective centers, and are respectively placed at opposite ends of the tensioning ring 20. The conical surfaces of the two conical sealing members 30 are respectively arranged opposite to the petal-shaped structures at opposite ends of the tensioning ring 20. Furthermore, the first threaded fastener is tightened and fixed to one end of the threaded rod 10 to fix one of the conical sealing members 30 (such as the first conical sealing member).

[0035] like Figure 6 and Figure 7 As shown, the center of the hammer 40 has a second through hole 41 along the axial direction for the threaded rod 10 to pass through. The hammer 40 can slide into the threaded rod 10 from the other end (i.e. the end away from the first threaded fastener) through the second through hole 41 along the axial direction, and the hammer 40 is positioned outside another conical sealing member 30 (such as the second conical sealing member). Then, the second threaded fastener is tightened on the end of the threaded rod 10 near the hammer 40 to prevent the hammer 40 from coming out of the threaded rod 10. Thus, the stator coil removal tool is assembled.

[0036] The stator coil removal tool may also include a third threaded fastener, which is screwed and slidably fitted onto the threaded rod 10 and positioned between the hammer 40 and the conical sealing member 30 adjacent to the hammer 40. By screwing the third threaded fastener forward, the conical sealing member 30 (such as the second conical sealing member) near the hammer 40 can be pushed forward, gradually pushing the conical surface of the conical sealing member 30 into the petal-shaped structure at the end of the tensioning ring 20. Continuing to screw and push forward tightens the tensioning ring 20, causing it to expand outward and fit tightly against the inner wall of the stator coil. Compared to directly pushing the conical sealing member 30, this method of using the third threaded fastener to push and tighten the conical sealing member 30 is less strenuous and provides a more even pushing force, ensuring a stable and secure forward tightening.

[0037] Specifically, the first and third threaded fasteners can be screws, and the second threaded fastener can be a nut. The outer diameter of the nut is larger than the diameter of the second through hole 41 of the hammer 40 to effectively prevent the hammer 40 from coming out.

[0038] Correspondingly, the method of using this stator coil removal tool includes: When it is necessary to use this stator coil removal tool to remove the stator coil inside the spindle, the tool can be assembled first, specifically including: S100, Assembly Steps: First, fit the tension ring 20 onto the threaded rod 10. Then, fit the two conical sealing pieces 30 onto the threaded rod 10 along the opposite direction of their conical surfaces and place them at opposite ends of the tension ring 20. Next, tighten the first threaded fastener (which can be a screw) to one end of the threaded rod 10 to secure one of the conical sealing pieces 30 (such as the first conical sealing piece). Then, slide the hammer 40 into the threaded rod 10 from the other end and fit it onto the threaded rod 10. Finally, tighten the second threaded fastener (which can be a nut) at the end of the threaded rod 10 near the hammer 40 to prevent the hammer 40 from coming out. At this point, the stator coil removal tool is assembled.

[0039] After assembling the stator coil removal tool, the process of using it to remove the stator coil from the spindle may include: S210, Insertion Step: Insert the assembled stator coil removal tool into the internal cavity of the stator coil, and position the tensioning ring 20 at the corresponding axial position on the inner wall of the stator coil; S220, Tightening Step: Push the conical sealing member 30 (such as the second conical sealing member) close to the hammer 40 along the axial direction towards the tightening ring 20, or screw on a third threaded fastener at that location, and screw the third threaded fastener forward to push the conical sealing member 30, so that the conical surface of the conical sealing member 30 is gradually pushed into the radially expandable petal structure formed by each saw cut 21 on the end side of the tightening ring 20. After the petal structure is pushed and tightened, the part with the saw cut 21 at its end begins to expand outward and towards the inner wall of the stator coil. Continue to push and tighten, so that the tightening ring 20 expands outward continuously until it is tightly attached to the inner wall of the stator coil. S230, Removal Steps: Pull the hammer 40 backward quickly and forcefully, causing the hammer 40 to strike the blocking surface of the second threaded fastener fixed to the end of the threaded rod 10 behind it. Utilize the inertial force and reaction force generated by the impact to gradually pull the stator coil out axially, thus completing the non-destructive removal of the stator coil from the main shaft.

[0040] With this design, the stator removal tool can remove the stator coil from the spindle in a non-destructive, efficient, and labor-saving manner. This not only prevents damage to the stator coil, allowing for its reuse and significantly reducing maintenance costs, but also greatly shortens maintenance time without affecting production schedules. Furthermore, the removal process will not damage or interfere with other structural components within the spindle. Moreover, the stator coil removal tool has a simple overall structure, making it easy to assemble and disassemble. The method of using this tool to remove the stator coil is also simple and easy to operate; the entire process can be completed by a single person, saving time and effort and reducing labor costs.

[0041] In one optional embodiment, there is a gap of at least 1 mm between the outer diameter of the tensioning ring 20 and the inner diameter of the stator coil to be removed. This allows the stator removal tool to smoothly extend into the inner cavity of the stator coil, avoiding jamming or scratching of the inner wall during insertion, while also providing space for the radial expansion of the tensioning ring 20 to ensure a reliable fit with the stator coil.

[0042] like Figures 1 to 3 As shown, in one specific embodiment, each saw slit 21 at both ends of the tension ring 20 can be configured as an elongated strip-shaped saw slit extending in the axial direction. Preferably, the saw slits 21 on the same side are evenly spaced circumferentially to facilitate uniform force distribution when the petal-shaped structure expands outward. For example, as shown in the figure, the tension ring 20 of this embodiment has eight evenly spaced strip-shaped saw slits at both ends circumferentially.

[0043] In a further preferred embodiment, the length of each saw cut 21 is less than or equal to half the length of the tension ring 20. The greater the opening length of the saw cut 21, the greater the expansion range of the end petal structure can be, and the more reliably it can fit with the inner wall of the stator coil.

[0044] For example, such as Figure 2 As shown, the length of the tensioning ring 20 can be 200mm, and the length of each saw cut 21 is 100mm.

[0045] And further preferred, such as Figure 2 As shown, the saw cuts 21 (such as the first strip saw cuts 211) on one end of the tension ring 20 and the saw cuts 21 (such as the second strip saw cuts 212) on the other end are staggered with each other in the circumferential direction. This not only makes the force more uniform when the two ends of the tension ring 20 expand, but also avoids the formation of continuous weak areas in the same axial direction, thereby improving the tightness of the fit and the reliability of the structure.

[0046] like Figure 4 and Figure 5 As shown, another optional embodiment is that the conical sealing member 30 may specifically include a cylindrical segment 33 and a frustum segment 32 connected sequentially along the axial direction. The frustum segment 32 is the aforementioned conical surface of the conical sealing member 30, and the cross-sectional dimension of the frustum segment 32 gradually decreases in the direction away from the cylindrical segment 33. The conical surface configured as a frustum structure not only increases the contact area with the end of the tensioning ring, avoiding stress concentration and damage to the parts, but also pushes the tensioning ring 20 to expand more smoothly and uniformly.

[0047] Furthermore, the diameter of the end face of the frustum segment 32 is the minimum cross-sectional dimension of the frustum segment 32, and the diameter at the junction of the frustum segment 32 and the cylindrical segment 33 is the maximum cross-sectional dimension of the frustum segment 32, and the maximum cross-sectional dimension of the frustum segment 32 is equal to the diameter of the cylindrical segment 33. Moreover, the cross-sectional dimension of the end face of the frustum segment 32 is smaller than the inner diameter of the unexpanded petal structure at the end of the tension ring 20, and the diameter of the cylindrical segment 33 is larger than the inner diameter of the unexpanded petal structure at the end of the tension ring 20.

[0048] For example, such as Figure 3 and Figure 5 As shown, the diameter of the end face of the frustum section 32 can be 67 mm, the diameter of the cylindrical section 33 can be 100 mm, and the inner diameter of the unexpanded petal structure at the end of the tension ring 20 can be 91 mm.

[0049] Furthermore, one specific embodiment is, as follows: Figure 3 , Figure 5 , Figure 7 and Figure 8 As shown, the height of the frustum section 32 can be at least 27 mm, and the height of the cylindrical section 33 can be at least 10 mm; the outer diameter of the unexpanded petal structure at the end of the tension ring 20 can be 110 mm, and the width of each saw cut 21 of the tension ring 20 can be at least 1.5 mm; the diameter of the first through hole 31 of the conical sealing member and the second through hole 41 of the hammer 40 can be at least 20 mm, the specification of the threaded rod 10 can be M12, and the length of the threaded rod 10 can be at least 1000 mm. In one alternative embodiment, the distance between the second threaded fastener and the conical sealing member 30 adjacent to the hammer 40 is greater than the axial length of the hammer 40, so that the hammer 40 has sufficient sliding impact distance to ensure that it can generate sufficient inertial force and reaction force, thereby effectively carrying the stator coil out axially.

[0050] Another alternative embodiment is that the material density of the hammer 40 is greater than that of ordinary steel, so that its own mass is sufficient to generate an inertial force that carries the stator coil out during a sliding impact.

[0051] Furthermore, one specific embodiment is, as follows: Figure 7 As shown, the two ends of the hammer 40 can be set as disc-shaped structures 42, and the middle part can be an arc-shaped structure that transitions to the two disc-shaped structures 42 at both ends. The arc-shaped structure can be set as a grip part 43 to facilitate the operator to hold the hammer 40 and pull the hammer 40 backward.

[0052] Specifically, the arc-shaped structure can be composed of three arc-shaped structures connected together. It can include two transition arc-shaped structures 431 located at both ends and respectively transitionally connected to the two disc-shaped structures 42, and a convex arc-shaped structure 432 located in the middle section and connected to the two transition arc-shaped structures 431. Preferably, the highest point of the convex arc-shaped structure 432 is higher than the lowest point of the transition arc-shaped structure 431, but the highest point of the convex arc-shaped structure 432 does not protrude beyond the outer periphery of the disc-shaped structures 42 at both ends, that is, the convex arc-shaped structure 432 is located within the outer periphery of the disc-shaped structures 42.

[0053] For example, such as Figure 7 As shown, the total axial length of the hammer 40 can be 180mm, the diameter of the disc-shaped structure 42 at the end of the hammer 40 can be 100mm, the extension length of the disc-shaped structure 42 can be 30mm, the arc diameter corresponding to the transition arc surface structure 431 can be 25mm, and the arc diameter corresponding to the convex arc structure 432 can be 120mm.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A stator coil extraction tool characterized by, include: The threaded rod and a tensioning ring sleeved on the threaded rod, two conical sealing parts, a hand hammer, and a first threaded fastener and a second threaded fastener respectively tightened and fixed at both ends of the threaded rod. The first threaded fastener is used to lock and fix the conical sealing part located at one end of the threaded rod, and the second threaded fastener is used to block the hand hammer to prevent it from slipping out of the threaded rod. The tensioning ring is a hollow tubular structure with multiple saw cuts at its two opposite ends along the axial direction, so that its two ends form a petal-shaped structure that can expand radially. The two conical sealing members are respectively placed at opposite ends of the tensioning ring, and each conical sealing member has a first through hole axially opened at its center for the threaded rod to pass through, and the conical surfaces of the two conical sealing members are respectively arranged opposite to the petal-shaped structures at opposite ends of the tensioning ring; The hammer has a second through hole along the axial direction at its center for the threaded rod to pass through, located on the outside of one of the tapered plugs.

2. The stator coil removal tool according to claim 1, characterized in that, There is a gap between the outer diameter of the tensioning ring and the inner diameter of the stator coil to be removed, and the gap is at least 1 mm.

3. The stator coil removal tool according to claim 1 or 2, characterized in that, The saw cuts at the ends of the tensioning ring are elongated strips extending in the axial direction, and the saw cuts at the same end on the same side are evenly spaced in the circumferential direction.

4. The stator coil removal tool according to claim 3, characterized in that, The length of each of the saw cuts is less than or equal to half the length of the tensioning ring; and / or The saw cuts on one end of the tensioning ring and the saw cuts on the other end are staggered in the circumferential direction.

5. The stator coil removal tool according to claim 1, characterized in that, The conical sealing member includes a cylindrical segment and a frustum segment connected sequentially along the axial direction. The frustum segment is the conical surface provided by the conical sealing member, and the cross-sectional dimension of the frustum segment gradually decreases in the direction away from the cylindrical segment.

6. The stator coil removal tool according to claim 5, characterized in that, The diameter of the end face of the frustum segment is the minimum cross-sectional dimension of the frustum segment, and the diameter of the position where the frustum segment meets the cylindrical segment is the maximum cross-sectional dimension of the frustum segment and is equal to the diameter of the cylindrical segment. The cross-sectional dimension of the end face of the frustum segment is smaller than the inner diameter of the petal-shaped structure at the end of the tensioning ring in its unexpanded state, and the diameter of the cylindrical segment is larger than the inner diameter of the petal-shaped structure at the end of the tensioning ring in its unexpanded state.

7. The stator coil removal tool according to claim 1, characterized in that, It also includes a third threaded fastener, which is screwed and slidably fitted onto the threaded rod and positioned between the hammer and the conical plug adjacent to the hammer.

8. The stator coil removal tool according to claim 7, characterized in that, The first and third threaded fasteners are screws, and the second threaded fastener is a nut; and / or The distance between the second threaded fastener and the conical plug adjacent to the hammer is greater than the axial length of the hammer; and / or The outer diameter of the second threaded fastener is larger than the diameter of the second through hole of the hammer.

9. The stator coil removal tool according to claim 1, characterized in that, The material density of the hammer is greater than that of steel; and / or The hammer has two disc-shaped structures at opposite ends and an arc-shaped structure in the middle that transitions to the two disc-shaped structures at the ends. The arc-shaped structure is configured as a grip. The arc-shaped structure includes two transition arc-shaped structures at both ends that are respectively connected to the two disc-shaped structures, and a convex arc-shaped structure in the middle section that is connected to the two transition arc-shaped structures. The highest point of the convex arc-shaped structure is higher than the lowest point of the transition arc-shaped structure, and the convex arc-shaped structure is located inside the periphery of the disc-shaped structure.

10. A method for using a stator coil removal tool, characterized in that, The method of using the stator coil removal tool according to any one of claims 1 to 9 includes: S100 Assembly steps: First, put the tensioning ring on the threaded rod. Then, put the two conical sealing parts on the threaded rod along the opposite direction of the conical surface and place them at opposite ends of the tensioning ring. Then, tighten the first threaded fastener to one end of the threaded rod to fix one of the conical sealing parts. Then, slide the hammer into the threaded rod from the other end and put it on the threaded rod. Then, tighten the second threaded fastener at the end of the threaded rod near the hammer to prevent the hammer from coming out. S210, Insertion Step: Insert the assembled stator coil removal tool into the internal cavity of the stator coil, and position the tensioning ring at the corresponding axial position on the inner wall of the stator coil; S220, Tightening step: Push the conical sealing member close to the hand hammer forward along the axial direction of the tensioning ring, so that the conical surface of the conical sealing member is gradually pushed into the petal-shaped structure formed by each saw cut on the end side of the tensioning ring, which can expand radially outward, and continue to push and tighten, so that the tensioning ring expands continuously until it is tightly attached to the inner wall of the stator coil; S230, Removal Step: Quickly pull the hammer backward to make it strike the second threaded fastener fixed to the end of the threaded rod behind it. Use the inertial force and reaction force generated by the impact to gradually pull the stator coil out along the axial direction, thus completing the non-destructive removal of the stator coil from the main shaft.

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