Motor stator core outer circle precision grinding equipment

Abstract

The utility model relates to grinding equipment technical field especially is a kind of motor stator core outer circle precision grinding equipment, including base, positioning mechanism is provided on the base and is used to position stator core, positioning mechanism includes: external positioning assembly, including the positioning table being set on the top of base;Internal positioning assembly includes the cylinder seat being fixed in the top middle of positioning table, four movable rods of circumferential arrangement are slidably installed on the cylinder seat and are transversely penetrated, inner positioning head is installed to movable rod outer end, recess is opened in movable rod upper end outer wall, four elastic sheets of circumferential arrangement are fixed to the outer wall of cylinder seat, and the lower end of elastic sheet is embedded in recess, internal hexagonal screw rod is installed in the upper end inside cylinder seat, and round table head is rotatably installed to internal hexagonal screw rod lower end;First, realize workpiece automatic centering by internal positioning assembly, then combined with external positioning assembly symmetric clamping to enhance rigidity, provide high concentricity and stability guarantee for outer circle precision grinding together.

Description

Technical Field

[0001] This utility model relates to the field of grinding equipment technology, specifically to a precision grinding equipment for the outer diameter of a motor stator core. Background Technology

[0002] As the core component of a motor, the dimensional accuracy and geometric tolerances of the stator core directly affect the motor's assembly quality, operating efficiency, and noise and vibration performance. In motor manufacturing, the stator core is typically made of laminated silicon steel sheets and assembled with the motor housing using an interference fit or transition fit on its outer diameter. According to CN219704519U, a precision grinding equipment is disclosed. This technology discloses a technical solution including: "a mounting frame, a lifting plate, an adjusting plate, and a connecting block. The mounting frame is provided with a guide groove, the lifting plate is slidably arranged inside the guide groove, a motor is mounted on the lifting plate, the motor shaft is connected to the adjusting plate through a flange, the adjusting plate is provided with an adjusting groove, and the connecting block is slidably connected inside the adjusting groove." It has the technical effect that "the grinding plate of the grinding block can be adjusted by rotating the threaded rod, and the elasticity of the spring can provide buffer when the grinding block contacts the workpiece, so as to be able to grind workpieces of different widths while avoiding damage caused by hard contact." In existing clamping methods, due to the lack of an inside-out collaborative positioning mechanism, relying solely on external clamping force can easily cause elastic deformation of the thin-walled stator core. Furthermore, stress release during grinding can lead to roundness deviations, directly affecting the machining accuracy of the outer diameter. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a precision grinding equipment for the outer diameter of a motor stator core. First, the internal positioning component enables automatic centering of the workpiece, and then the external positioning component provides symmetrical clamping to enhance rigidity, thus ensuring high concentricity and stability for the precision grinding of the outer diameter.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a precision grinding device for the outer diameter of a motor stator core, comprising a base, wherein a positioning mechanism is provided on the base for positioning the stator core, the positioning mechanism comprising: External positioning components, including a positioning platform disposed above the base; The internal positioning assembly includes a cylindrical base fixed to the center of the top of the positioning platform. Four circumferentially arranged movable rods are slidably mounted on the cylindrical base. An inner positioning head is installed on the outer end of each movable rod. A groove is formed on the outer wall of the upper end of each movable rod. Four circumferentially arranged elastic plates are fixed on the outer wall of the cylindrical base, and the lower ends of the elastic plates are embedded in the grooves. An internal hexagonal screw is threaded onto the upper end of the cylindrical base. A frustum head is rotatably mounted on the lower end of the internal hexagonal screw.

[0005] Preferably, the external positioning component further includes a slide groove fixed inside the positioning platform. A bidirectional lead screw is rotatably installed between the left and right ends of the positioning platform and located inside the slide groove. Slider blocks are slidably installed on both the left and right sides inside the slide groove and threadedly installed with the bidirectional lead screw. A handwheel is fixed to one end of the bidirectional lead screw, and a mounting seat is installed on the upper end of the slider by bolts. An external positioning head is fixed on the mounting seat.

[0006] Preferably, the internal positioning component further includes a threaded hole formed on the outer end surface of the movable rod, and an installation hole is formed inside the internal positioning head.

[0007] Preferably, the inner end of the movable rod has an inclined surface structure, and the inclined surface matches the surface of the frustum head.

[0008] Preferably, the bottom surface of the groove is an inclined surface, and the inclined surface cooperates with the inclined surface of the lower end of the elastic sheet.

[0009] Preferably, a Y-axis linear module is installed on the upper end of the base, and a positioning platform is installed on the sliding part of the Y-axis linear module. A gantry frame is fixed at the rear end of the top of the base, an X-axis linear module is installed above the front end of the gantry frame, a Z-axis linear module is installed on the sliding part of the X-axis linear module, and a grinding machine is installed on the sliding part of the Z-axis linear module.

[0010] Beneficial effects This invention provides a precision grinding device for the outer diameter of a motor stator core. Compared with the prior art, it has the following advantages: 1. By rotating the internal hexagonal screw, the lower end of the frustum head moves axially. The axial thrust is converted into synchronous and smooth radial expansion of the movable rods by the cooperation of the conical surface of the frustum head with the inclined surfaces of the four circumferentially distributed movable rods. This allows the inner positioning head, installed at the outer end of the movable rods, to tightly fit against the inner wall of the stator core, achieving automatic centering and rigid support. Furthermore, the lower end of the elastic plate is embedded in the groove of the movable rod, providing a continuous elastic restoring force to ensure that multiple movable rods automatically and synchronously retract and reset when the internal hexagonal screw is released. This achieves centering and positioning of the workpiece, ensuring concentricity for external cylindrical grinding, and is easy to operate with uniform clamping force distribution.

[0011] 2. After the workpiece is positioned and supported on the positioning table by the internal positioning components, the handwheel is turned to drive the bidirectional lead screw to rotate. Utilizing its left and right helical thread characteristics, the two sliders are precisely driven to produce synchronous and opposite linear motion in the slide groove. This drives the mounting base and outer positioning head mounted on the upper end of the slider to move laterally until the two outer positioning heads simultaneously contact and stably press against the outer circle of the stator core. This achieves first positioning of the inner hole and then clamping of the outer circle. The geometric center position of the workpiece is ensured by using the inner hole as a reference. Then, the external clamping eliminates the degree of freedom and enhances rigidity, thus laying a concentricity foundation for subsequent outer circle grinding. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the upper end of the positioning mechanism in this utility model; Figure 3 This is a schematic diagram of the lower end of the positioning mechanism in this utility model; Figure 4 This is an exploded view of the internal positioning component in this utility model; Figure 5 This is a cross-sectional view of the internal positioning component in this utility model.

[0013] In the diagram: 1. Base; 2. Positioning mechanism; 21. External positioning component; 211. Positioning table; 212. Slide groove; 213. Two-way lead screw; 214. Slider; 215. Handwheel; 216. Mounting seat; 217. External positioning head; 22. Internal positioning component; 221. Cylinder seat; 222. Movable rod; 223. Internal positioning head; 224. Groove; 225. Elastic plate; 226. Socket head screw; 227. Frustum head; 228. Threaded hole; 229. Mounting hole; 3. Y-axis linear module; 4. Gantry frame; 5. X-axis linear module; 6. Z-axis linear module; 7. Grinding machine. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1 - Figure 5 This utility model provides a technical solution: a precision grinding device for the outer diameter of a motor stator core, comprising a base 1, wherein a positioning mechanism 2 is provided on the base 1 for positioning the stator core, the positioning mechanism 2 comprising: The external positioning component 21 includes a positioning platform 211 disposed above the base 1; The internal positioning assembly 22 includes a cylindrical base 221 fixed in the middle of the top of the positioning platform 211. Four circumferentially arranged movable rods 222 are slidably mounted through the cylindrical base 221. An inner positioning head 223 is installed at the outer end of the movable rods 222. A groove 224 is opened on the outer wall of the upper end of the movable rods 222. Four circumferentially arranged elastic pieces 225 are fixed on the outer wall of the cylindrical base 221, and the lower end of the elastic pieces 225 is embedded in the groove 224. An internal hexagonal screw 226 is threadedly installed at the upper end of the internal hexagonal screw 226, and a frustum head 227 is rotatably installed at the lower end of the internal hexagonal screw 226.

[0016] In this embodiment, the axial movement of the frustum head 227 at its lower end is driven by rotating the internal hexagonal screw 226. The axial thrust is converted into a synchronous and smooth radial expansion motion of the movable rods 222 by the cooperation of the conical surface of the frustum head 227 with the inner inclined surfaces of the four circumferentially distributed movable rods 222. This allows the inner positioning head 223, installed at the outer end of the movable rods 222, to fit tightly against the inner wall of the stator core from the inside, achieving automatic centering and rigid support. Furthermore, the lower end of the elastic plate 225 is embedded in the groove 224 of the movable rod 222, providing a continuous elastic restoring force to the movable rods 222. This ensures that the multiple movable rods 222 can automatically and synchronously retract and reset when the internal hexagonal screw 226 is released. This achieves the centering and positioning of the workpiece, provides concentricity assurance for external cylindrical grinding, and is easy to operate with uniform clamping force distribution.

[0017] Specifically, the external positioning component 21 also includes a slide groove 212 fixed inside the positioning platform 211. A bidirectional lead screw 213 is rotatably installed between the left and right ends of the positioning platform 211 and located inside the slide groove 212. Slider blocks 214 are slidably installed on both the left and right sides inside the slide groove 212 and threadedly installed with the bidirectional lead screw 213. A handwheel 215 is fixed to one end of the bidirectional lead screw 213. A mounting base 216 is installed on the upper end of the slider 214 by bolts. An external positioning head 217 is fixed on the mounting base 216.

[0018] In this embodiment, after the workpiece is positioned and supported on the positioning table 211 by the internal positioning component 22, the handwheel 215 is rotated to drive the bidirectional lead screw 213 to rotate. Utilizing its left and right helical thread characteristics, the two sliders 214 are precisely driven to generate synchronous and opposite linear motion in the slide groove 212. This drives the mounting base 216 and the outer positioning head 217 mounted on the upper end of the slider 214 to move laterally until the outer positioning heads 217 on both sides simultaneously contact and stably press against the outer circle of the stator core. This achieves first positioning of the inner hole and then clamping of the outer circle. The geometric center position of the workpiece is ensured by using the inner hole as a reference. Then, the external clamping eliminates the degree of freedom and enhances the rigidity, thus laying a concentricity foundation for subsequent outer circle grinding.

[0019] Specifically, the internal positioning component 22 also includes a threaded hole 228 on the outer end surface of the movable rod 222, and an installation hole 229 is provided inside the inner positioning head 223; the threaded hole 228 is provided on the outer end surface of the movable rod 222, and the installation hole 229 is provided inside the inner positioning head 223.

[0020] In this embodiment, by passing the bolt through the mounting hole 229 of the inner positioning head 223 and screwing it into the threaded hole 228 of the movable rod 222, a stable connection between the inner positioning head 223 and the movable rod 222 can be achieved. This detachable connection method makes it easy to replace the inner positioning head 223 with a suitable size or shape according to different specifications of stator cores, so as to improve the adaptability of the equipment to different workpieces and the positioning accuracy, thereby ensuring the concentricity of the outer cylindrical grinding.

[0021] Specifically, the inner end of the movable rod 222 has an inclined structure, and the inclined surface matches the surface of the frustum head 227.

[0022] In this embodiment, when the hexagonal screw 226 drives the frustum head 227 to move axially, the conical surface of the frustum head 227 is in close contact with the inclined surface of the inner end of the movable rod 222. As the frustum head 227 moves downward, its conical surface will evenly and smoothly convert the axial thrust into the radial expansion force of the movable rod 222, so that the four circumferentially distributed movable rods 222 can move outward synchronously.

[0023] Specifically, the bottom surface of the groove 224 is an inclined surface, and the inclined surface cooperates with the inclined surface of the lower end of the elastic sheet 225.

[0024] In this embodiment, when the internal hexagon screw 226 is loosened and the frustum head 227 no longer applies axial thrust to the movable rod 222, the elastic restoring force of the elastic plate 225 will be transmitted through the inclined surface of the groove 224, driving the movable rod 222 to automatically and synchronously retract and reset; ensuring that the movable rod 222 can quickly and accurately return to its initial state.

[0025] Specifically, a Y-axis linear module 3 is installed on the upper end of the base 1, and a positioning table 211 is installed on the sliding part of the Y-axis linear module 3. A gantry frame 4 is fixed at the rear end of the top of the base 1. An X-axis linear module 5 is installed above the front end of the gantry frame 4. A Z-axis linear module 6 is installed on the sliding part of the X-axis linear module 5. A grinding machine 7 is installed on the sliding part of the Z-axis linear module 6.

[0026] In this embodiment, through the coordinated operation of the three axial linear modules of X, Y, and Z, the grinding machine 7 can be precisely positioned and moved in three-dimensional space, thereby accurately adjusting the grinding position and feed rate according to the actual situation of the outer circle of the stator core, and realizing high-precision grinding of the outer circle of the stator core.

[0027] The working principle and usage process of this utility model are as follows: First, the stator core workpiece to be processed is placed on the positioning table 211. By rotating the internal hexagonal screw 226, the lower end of the frustum head 227 is driven to move axially. By utilizing the cooperation between the conical surface of the frustum head 227 and the inclined surface of the inner end of the four circumferentially distributed movable rods 222, the axial thrust is converted into the synchronous and stable radial expansion motion of the movable rods 222. This causes the inner positioning head 223 installed on the outer end of the movable rods 222 to fit tightly against the inner wall of the stator core from the inside, achieving automatic centering and rigid support. Then, the handwheel 215 is rotated to drive the bidirectional lead screw 213 to rotate. Utilizing its left and right helical thread characteristics, the two sliders 214 are precisely driven to generate synchronous and opposite linear motion within the groove 212. This drives the mounting base 216 and the outer positioning head 217 mounted on the upper end of the slider 214 to move laterally until the outer positioning heads 217 on both sides simultaneously contact and stably press against the outer circle of the stator core. This achieves positioning of the inner hole first, followed by clamping of the outer circle. The geometric center position of the workpiece is ensured by using the inner hole as a reference. Then, external clamping eliminates the degree of freedom and enhances rigidity, thus laying a concentricity foundation for subsequent outer circle grinding. Finally, through the coordinated operation of the three linear modules along the X, Y, and Z axes, the grinding machine 7 can accurately position and move in three-dimensional space, thereby precisely adjusting the grinding position and feed rate according to the actual situation of the stator core outer circle, and achieving high-precision grinding of the stator core outer circle.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision grinding machine for the outer diameter of a motor stator core, comprising a base (1), characterized in that: The base (1) is provided with a positioning mechanism (2) for positioning the stator core. The positioning mechanism (2) includes: External positioning component (21) includes a positioning platform (211) disposed above the base (1). The internal positioning assembly (22) includes a cylindrical base (221) fixed in the middle of the top of the positioning platform (211). Four movable rods (222) are circumferentially arranged and slidably installed on the cylindrical base (221). An inner positioning head (223) is installed on the outer end of the movable rod (222). A groove (224) is opened on the outer wall of the upper end of the movable rod (222). Four elastic plates (225) are fixed on the outer wall of the cylindrical base (221), and the lower end of the elastic plate (225) is embedded in the groove (224). An internal hexagonal screw (226) is threaded on the upper end of the cylindrical base (221), and a frustum head (227) is rotatably installed on the lower end of the internal hexagonal screw (226).

2. The precision grinding equipment for the outer diameter of a motor stator core according to claim 1, characterized in that: The external positioning component (21) also includes a slide groove (212) fixed inside the positioning platform (211). A bidirectional lead screw (213) is rotatably installed between the left and right ends of the positioning platform (211) and located inside the slide groove (212). Slider blocks (214) are slidably installed on both the left and right sides inside the slide groove (212) and threadedly installed with the bidirectional lead screw (213). A handwheel (215) is fixed at one end of the bidirectional lead screw (213). A mounting seat (216) is installed on the upper end of the slider (214) by bolts. An external positioning head (217) is fixed on the mounting seat (216).

3. The precision grinding equipment for the outer diameter of a motor stator core according to claim 1, characterized in that: The internal positioning component (22) also includes a threaded hole (228) on the outer end surface of the movable rod (222), and an installation hole (229) is provided inside the internal positioning head (223).

4. The precision grinding equipment for the outer diameter of a motor stator core according to claim 1, characterized in that: The inner end of the movable rod (222) is a bevel structure, and the bevel is matched with the surface of the truncated cone head (227).

5. The precision grinding equipment for the outer diameter of a motor stator core according to claim 1, characterized in that: The bottom surface of the groove (224) is an inclined surface, and the inclined surface cooperates with the inclined surface of the lower end of the elastic sheet (225) embedded part.

6. The precision grinding equipment for the outer diameter of a motor stator core according to claim 1, characterized in that: The upper end of the base (1) is equipped with a Y-axis linear module (3), and the positioning table (211) is installed on the sliding part of the Y-axis linear module (3). The rear end of the top of the base (1) is fixed with a gantry (4). The front end of the gantry (4) is equipped with an X-axis linear module (5). The sliding part of the X-axis linear module (5) is equipped with a Z-axis linear module (6). The sliding part of the Z-axis linear module (6) is equipped with a grinding machine (7).

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