Automatic press-fitting device for stator end cover

Abstract

The invention relates to an automatic press-fitting device for a stator end cover, which belongs to the technical field of motor assembly, and comprises a rack, a stator placing table, an end cover placing table, an end cover jacking part and an end cover press-fitting part, the stator placing table is provided with a stator positioning structure; the end cover placing table is arranged above the stator placing table and is provided with an end cover positioning structure, and the end cover placing table can be moved or detached; the end cover jacking part is arranged on the stator placing table, and when the end cover jacking part is jacked upwards, the end cover can be separated from the end cover placing table; and the end cover press-fitting part is arranged above the end cover placing table, and the end cover and the stator can be press-fitted by pressing the end cover press-fitting part towards the stator placing table. After the stator and the end cover are positioned in the radial direction and the angular direction through the stator positioning structure and the end cover positioning structure respectively, the end cover is pressed by the end cover pressing part. Therefore, automatic assembly of the stator and the end cover is realized under accurate radial and angular positioning.

Description

Technical Field

[0001] The present application relates to the technical field of motor assembly, and in particular to an automatic press-fitting device for a stator end cover. Background Art

[0002] Motor assembly is the most important assembly process of traction motors. The upgrade of its assembly operation mode is the focus of the current transformation of the motor manufacturing industry. Among them, an important key technology for the automation of the assembly of end covers and stator frames is to ensure the automatic assembly of the end covers and stator frames and to ensure that the angular positions of the two are consistent.

[0003] The end cover of medium and large motors and the stator base generally adopt a stopper plus transition or a small interference fit. During assembly, manual assembly is adopted, and the end cover is positioned angularly and radially using a guide rod. This operation process is very slow, and careful manual observation is required to ensure that the end cover and the stator end surface are aligned correctly. After the end cover stopper enters the stator base, if the dead weight cannot overcome the interference fit, the end cover is assembled in place by tightening bolts.

[0004] As motor assembly lines transform from traditional manual operations to intelligent and automated operations, the end cover assembly method using manual positioning obviously cannot meet the requirements of automated assembly. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present application provides a stator end cover automatic press-fitting device, which enables the stator and the end cover to be press-fitted under precise angular positioning, thereby realizing the automatic assembly of the stator and the end cover.

[0006] To achieve the above-mentioned purpose, the present application provides a stator end cover automatic press-fitting device, comprising a frame, and further comprising: a stator placement table, an end cover placement table, an end cover lifting portion, and an end cover press-fitting portion; The stator placement platform has a stator positioning structure; The end cap placement platform is arranged above the stator placement platform, has an end cap positioning structure, and the end cap placement platform can be moved or disassembled; The end cover lifting part is arranged on the stator placement platform, and when the end cover lifting part is lifted upward, the end cover can be separated from the end cover placement platform; The end cover press-fitting part is arranged above the end cover placement platform, and the end cover and the stator can be press-fitted by pressing the end cover press-fitting part downward toward the stator placement platform.

[0007] Optionally, the stator positioning structure is a stator stop and a stator positioning pin, the stator stop is a raised ring arranged above the stator placement table; the raised ring is arranged concentrically with the stator placement axis, and the stator positioning pin is arranged above the stator placement table.

[0008] Optionally, the stator stop is at least two raised circular rings, and the raised circular rings gradually decrease in height from the axis to the outside in a stepped manner.

[0009] Optionally, the raised circular ring is at least two raised circular arcs.

[0010] Optionally, the outer side of the raised ring is chamfered.

[0011] Optionally, the frame is provided with an end cover guide rail, and the end cover placement platform can move from the end cover upper material position to the end cover pressing position through the end cover guide rail; The end cover placement platform is a single-side opening structure, and the opening direction is along the guide rail toward the end cover press-fitting position.

[0012] Optionally, the end cover positioning structure includes an end cover stop and an end cover positioning pin coaxially arranged with the end cover, the end cover stop is a raised arc with a single-side opening, or at least two raised arcs; the end cover positioning pin is arranged above the end cover placement platform.

[0013] Optionally, the end cover stopper is provided with at least two levels of stops with gradually increasing heights in a stepped manner from the axis to the outside.

[0014] Optionally, the end cover positioning structure further includes at least two spring positioning pins that are concentrically arranged with different diameters.

[0015] Optionally, the frame is provided with a stator guide rail, and the stator placement table can move from the stator loading position to the press-fitting working position through the stator guide rail; The stator placement platform is provided with a first sensor; the end cover placement platform is provided with a second sensor.

[0016] The present application provides a stator end cover automatic press-fitting device, comprising a frame, a stator placement table, an end cover placement table, an end cover lifting portion and an end cover pressing portion; the stator placement table has a stator positioning structure; the end cover placement table is arranged above the stator placement table, has an end cover positioning structure, and the end cover placement table can be moved or disassembled; the end cover lifting portion is arranged on the stator placement table, and the end cover can be separated from the end cover placement table when the end cover lifting portion is lifted upward; the end cover pressing portion is arranged above the end cover placement table, and the end cover and the stator can be pressed together by pressing the end cover pressing portion downward on the stator placement table.

[0017] The existing medium and large motor end covers and stator bases generally use stoppers plus transitions or small interference fits. During assembly, manual assembly is used, and guide rods are used to position the end covers angularly and radially. This operation process is very slow, and careful manual observation is required to ensure that the end cover and the stator end holes are aligned correctly. After the end cover stopper enters the stator base, if the dead weight cannot overcome the interference fit, the end cover is assembled in place by tightening bolts.

[0018] The stator end cover automatic press-fitting device provided in the embodiment of the present application, after the stator and the end cover are radially and angularly positioned by the stator positioning structure and the end cover positioning structure respectively, the end cover is lifted by the end cover lifting part, and then the end cover is press-fitted by the end cover press-fitting part, thereby realizing the automatic assembly of the stator and the end cover under precise radial and angular positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of an automatic stator end cover press-fitting device according to one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a stator placement table of an embodiment of the automatic press-fitting device for stator end covers of the present application; Figure 3 This is a schematic diagram of the structure of an end cover placement table of an embodiment of the stator end cover automatic press-fitting device of the present application; Figure 4 This is a schematic structural diagram of the end cover lifting portion of an embodiment of the stator end cover automatic press-fitting device of the present application; Figure 5 This is a schematic structural diagram of the end cover pressing portion of an embodiment of the automatic stator end cover pressing device of the present application.

[0020] Reference numerals: Stator placement platform 100, stator stop 110, stator guide rail 120, first sensor 130; End cover placement platform 200, end cover stopper 210, end cover guide rail 220, second sensor 230, spring positioning pin 240; The end cover lifting part 300, the lifting cylinder 310, and the lifting platform 320; the end cover pressing part 400, and the spring guide shaft 410. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] The existing medium and large motor end covers and stator bases generally use stoppers plus transitions or small interference fits. Manual assembly is used during assembly, and guide rods are used to position the end covers angularly and radially. This operation process is very slow and requires careful manual observation to ensure that the end cover and the stator end surface holes are aligned correctly. After the end cover stopper enters the stator base, if the dead weight cannot overcome the interference fit, the end cover is assembled in place by tightening bolts. As the motor assembly line transforms from traditional manual operations to intelligent and automated operations, the end cover assembly method using manual positioning obviously cannot meet the requirements of automated assembly.

[0024] In order to realize the automatic assembly of the stator and the end cover, in a first embodiment of a stator end cover automatic press-fitting device of the present application, a stator end cover automatic press-fitting device is provided, comprising a frame, and further comprising: a stator placement table 100, an end cover placement table 200, an end cover lifting portion 300 and an end cover pressing portion 400; the stator placement table 100 has a stator positioning structure; the end cover placement table 200 is arranged above the stator placement table 100, has an end cover positioning structure, and the end cover placement table 200 can be moved or disassembled; the end cover lifting portion 300 is arranged on the stator placement table 100, and the end cover can be separated from the end cover placement table 200 when the end cover lifting portion 300 is lifted upward; the end cover pressing portion 400 is arranged above the end cover placement table 200, and the end cover and the stator can be pressed together by pressing the end cover pressing portion 400 downward on the stator placement table 100.

[0025] It should be noted that, refer to Figure 1 , Figure 1 The schematic diagram of the structure of the automatic press-fitting device for the stator end cover of the present application. The stator positioning structure performs radial and angular positioning on the stator frame, and the stator positioning structure can be a stopper, a positioning pin, a positioning bolt or a positioning frame, etc., which are commonly used positioning and guiding structures in the field. The end cover positioning structure performs radial and angular positioning on the end cover, and the end cover positioning structure can be a stopper, a positioning pin, a positioning bolt or a positioning frame, etc., which are commonly used positioning and guiding structures in the field. The end cover placement table 200 is located above the stator placement table 100. When the end cover is being press-fitted, the end cover positioning structure and the stator positioning structure keep the end cover axis consistent with the stator axis, and the end cover angular direction consistent with the stator angular direction. During press-fitting, the end cover is first lifted by the end cover lifting portion 300, and the end cover placement table 200 is moved out or disassembled from under the end cover press-fitting portion 400, and then the end cover press-fitting portion 400 cooperates with the end cover lifting portion 300 to press-fit the end cover onto the stator. The stator placement platform 100 is provided with a central through hole, and the axis of the central through hole is coaxial with the centering of the stator base. Figure 4The end cover lifting part 300 is fixedly arranged at the central through hole of the stator placement platform 100, and has a lifting cylinder 310 and a lifting platform 320 that can lift the end cover up and down. When lifting the end cover, the end cover lifting part 300 can lift the end cover alone, or the end cover lifting part 300 and the end cover pressing part 400 can lift the end cover together. Figure 5 The end cover press-fitting portion 400 has a plurality of spring guide shafts 410 arranged downwardly, which keep the end cover angularly consistent by applying pressure to the end cover during press-fitting.

[0026] Exemplarily, after the end cover is radially and angularly positioned by the end cover placement table 200, the end cover is fixed by the end cover lifting part 300 and the end cover pressing part 400, the end cover placement table 200 is withdrawn through the track, and then the end cover lifting part 300 and the end cover pressing part 400 cooperate to press the end cover vertically down to the stator frame, and the angular direction of the end cover is kept consistent during the pressing process.

[0027] In this embodiment, the stator end cover automatic press-fitting device of the present application, after the stator and the end cover are radially and angularly positioned by the stator positioning structure and the end cover positioning structure respectively, the end cover is lifted by the end cover lifting part 300, and then the end cover is press-fitted by the end cover press-fitting part 400. In this way, the automatic assembly of the stator and the end cover is realized under precise radial and angular positioning.

[0028] Furthermore, the stator positioning structure is a stator stop 110 and a stator positioning pin; the stator stop 110 is a raised ring arranged above the stator placement platform 100, and the raised ring is arranged concentrically with the stator placement axis; the stator positioning pin is arranged above the stator placement platform 100.

[0029] It should be noted that, refer to Figure 1 and Figure 2 The stator base is a hollow shaft structure, and the stator stop 110 is a raised annular stop, which is fitted with the inner wall of the stator hollow shaft through a transition fit or a small interference fit, that is, the outer diameter of the raised annular ring is set to be equal to or close to the diameter of the stator hollow shaft, and the raised annular ring is coaxial with the stator axis, so as to radially limit the stator. The stator locating pin is a locating pin or a locating pin hole on the stator placement table 100 corresponding to the locating hole of the stator base. The locating pin or the locating pin hole can be specifically set on the stator stop 110 or on the side of the stator stop 110, so as to further angularly limit the stator through the locating pin when the stator is placed. In this embodiment and subsequent embodiments, the locating pin can be a fixed locating pin or a locating pin installed in conjunction with the locating pin hole.

[0030] Furthermore, the stator stop 110 is at least two raised circular rings, and the raised circular rings gradually decrease in height from the axis to the outside in a stepped manner.

[0031] It should be noted that, refer to Figure 2The stator stop 110 can be set as two or more concentric raised rings with different diameters. As the diameter increases, the raised height of each raised ring gradually decreases to adapt to various models of stator hollow shafts with different inner diameters.

[0032] Furthermore, the raised circular ring is composed of at least two raised circular arcs.

[0033] In this embodiment, the raised ring of the stator stop 110 can be divided into two or more raised arcs with the same inner and outer diameters, and in other feasible implementations, each raised arc can also be set as a stepped protrusion, such as Figure 2 As shown, the stator locating pin can be arranged inside or beside the raised arc to accommodate various types of stator hollow shafts with different inner diameters.

[0034] Furthermore, the outer side of the raised ring is chamfered.

[0035] In this embodiment, the outer side of the raised circular ring of the stator stop 110 is chamfered, which guides the fitting connection between the stator hollow shaft wall and the stator stop 110 when the stator is placed, thereby facilitating the fitting connection between the stator and the stator stop 110 .

[0036] Furthermore, the frame is provided with an end cover guide rail 220, and the end cover placement platform 200 can move from the end cover upper material position to the end cover pressing position through the end cover guide rail 220; the end cover placement platform 200 is a single-sided opening structure, and the opening direction is along the guide rail to the end cover pressing position.

[0037] It should be noted that, refer to Figure 1 A servo motor and a ball screw are provided on one side of the end cap guide rail 220 to drive the end cap placement platform 200 to move along the end cap guide rail 220. In other embodiments, the guide rail may also adopt other feasible driving methods to drive the end cap placement platform 200. The end cap placement platform 200 is a single-sided opening structure, which can be laterally evacuated from the end cap pressing position when the end cap is pressed. The single-sided opening structure can be specifically set as a "U"-shaped opening structure. The end cap placement platform 200 has an end cap loading position and an end cap pressing position on the guide rail. When the end cap is pressed, the end cap positioning structure and the stator positioning structure can keep the end cap axis consistent with the stator axis, and the end cap angular direction consistent with the stator angular direction.

[0038] For example, after the end cap is positioned radially and angularly at the end cap upper material position of the end cap placement platform 200, the end cap placement platform 200 moves to the end cap press-fitting position for press-fitting. During press-fitting, the end cap lifting part 300 and the end cap press-fitting part 400 cooperate to lift the end cap off the end cap placement platform 200, while the angular and radial positions remain unchanged, and the end cap placement platform 200 withdraws from the bottom of the lifted end cap along the guide rail. After the end cap placement platform 200 is completely withdrawn, the end cap lifting part 300 and the end cap press-fitting part 400 cooperate to press-fit the end cap.

[0039] Furthermore, the end cover positioning structure includes an end cover stop 210 and an end cover positioning pin coaxially arranged with the end cover; the end cover stop 210 is a raised arc with a single-side opening, or at least two raised arcs; the end cover positioning pin is arranged above the end cover placement platform 200.

[0040] It should be noted that, refer to Figure 1 and Figure 3 An end cap positioning structure is provided above the end cap positioning platform, and the setting principle of the end cap positioning structure is similar to that of the stator positioning structure. The end cap stop 210 is a single-sided opening structure that matches the above-mentioned end cap placement platform 200, and can be set as a single-sided opening raised arc, or a multi-section raised arc. The raised arc of the end cap stop 210 is coaxially arranged with the axis of the end cap. The end cap has an annular boss stop structure, and the annular boss stop structure matches the raised arc of the end cap stop 210. An end cap positioning pin is provided on or beside the raised arc of the end cap stop 210, and the inner diameter of the raised arc is close to or slightly larger than the outer diameter of the annular boss stop structure, so as to facilitate the placement of the end cap on the end cap positioning platform and radial positioning of the end cap. The end cap positioning pin matches the positioning hole of the annular boss stop structure of the end cap to angularly position the end cap.

[0041] Furthermore, the end cover stop 210 is provided with at least two levels of stops with gradually increasing heights in a stepped manner from the axis to the outside.

[0042] In this embodiment, refer to Figure 3 In order to match the end caps of various models, the end cap stop 210 is set as a multi-step ladder structure, and the raised height of the raised ring or raised arc gradually increases from the axis to the outside. It should be noted that, depending on the different end cap structures, the multi-step ladder structure can also add grooves according to the specific end cap. The inner side of the raised ring or raised arc of the end cap stop 210 is chamfered to guide the end cap when it is placed.

[0043] Furthermore, the end cover positioning structure also includes at least two spring positioning pins 240 that are concentrically arranged with different diameters.

[0044] It should be noted that, refer to Figure 3 The end cap is provided with spring locating pin 240 holes with different axial center distances according to the model. Based on this, the end cap positioning structure also includes two or more spring locating pins 240, which are the same as the stator axis and have different axial center distances, and are arranged above the end cap placement platform 200. When a certain model of end cap is placed on the end cap placement platform 200, its spring locating pin 240 hole cooperates with the corresponding spring locating pin 240 arranged with the same axial center distance for further angular positioning, and the remaining spring locating pins 240 with different axial center distances are pressed down due to the gravity of the end cap.

[0045] Furthermore, the frame is provided with a stator guide rail 120 , and the stator placement table 100 can move from the stator loading position to the press-fitting position through the stator guide rail 120 ; the stator placement table 100 is provided with a first sensor 130 ; and the end cover placement table 200 is provided with a second sensor 230 .

[0046] It should be noted that, refer to Figure 1 A servo motor and a ball screw are provided on one side of the stator guide rail 120 to drive the stator placement platform 100 to move along the stator guide rail 120. The stator guide rail 120 has a stator loading position and a press-fitting working position. When the stator placement platform 100 is at the stator loading position, the stator is hoisted to the stator placement platform 100 and correspondingly positioned in the angular and radial directions. The stator placement platform 100 then moves to the press-fitting working position to press-fit the end cover. When the stator placement platform 100 is at the working position and the end cover placement platform 200 is at the end cover press-fitting position, the axis of the stator and the end cover are consistent.

[0047] In this embodiment, the first sensor 130 is arranged on the stator placement table 100 to detect whether the stator is placed in place; or the first sensor 130 is also used to detect the position of the stator placement table 100 on the stator guide rail 120, specifically, the first sensor 130 further confirms whether the stator placement table 100 is accurately moved to the stator working position. The second sensor 230 is arranged on the end cap placement table 200 to detect whether the end cap is placed in place; or it is also used to detect the position of the end cap placement table 200 on the end cap guide rail 220 to further confirm whether the end cap placement table 200 is accurately moved to the end cap press-fitting position; or it can also be used to detect whether the end cap is evacuated from the press-fitting position when the end cap is press-fitted.

[0048] For example, the operation process of the automatic press-fitting device for the stator end cover of the present application is as follows: S1, in the initial state, the stator placement table and the end cover placement table are both in the loading position, and the end cover lifting part and the end cover pressing part are in the original position; S2, loading the stator onto the stator placement table by means of a robot or hoisting; S3, loading the end cap onto the end cap placement table by means of a robot or hoisting; S4, the stator placement table moves to the press-fitting working position, and the end cover placement table moves to the end cover press-fitting position; S5, the end cover lifting part lifts the cylinder to the working position to lift the end cover to separate from the end cover placement table, and at the same time, the end cover pressing part and the end cover lifting part cooperate to maintain the radial and angular positioning of the end cover; S6, the end cover placement table returns to the end cover loading position; S7, a press machine of the end cover press-fitting part presses the end cover onto the stator end surface; S8, the press of the end cover pressing part returns to its original position, the end cover lifting part returns to its original position, and the stator placing table returns to the stator loading position with the pressed stator to complete the operation.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0050] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A stator end cover automatic press-fitting device, comprising a frame, characterized in that: Also includes: A stator placement table, an end cover placement table, an end cover lifting portion, and an end cover pressing portion are arranged on the frame; The stator placement platform has a stator positioning structure; The end cap placement platform is arranged above the stator placement platform, has an end cap positioning structure, and the end cap placement platform can be moved or disassembled; The end cover lifting part is arranged on the stator placement platform, and when the end cover lifting part is lifted upward, the end cover can be separated from the end cover placement platform; The end cover press-fitting part is arranged above the end cover placement platform, and the end cover and the stator can be press-fitted by pressing the end cover press-fitting part downward toward the stator placement platform.

2. The automatic press-fitting device for stator end cover according to claim 1, characterized in that: The stator positioning structure is a stator stop and a stator positioning pin; the stator stop is a raised ring arranged above the stator placement platform, and the raised ring is arranged concentrically with the stator placement axis; the stator positioning pin is arranged above the stator placement platform.

3. The automatic press-fitting device for stator end cover according to claim 2, characterized in that: The stator stop is at least two raised circular rings, and the raised circular rings gradually decrease in height from the axis to the outside in a stepped manner.

4. The automatic press-fitting device for stator end cover according to claim 3, characterized in that: The raised circular ring is composed of at least two raised circular arcs.

5. The automatic press-fitting device for stator end cover according to claim 3, characterized in that: The outer side of the raised ring is provided with a chamfer.

6. The automatic press-fitting device for stator end cover according to claim 1, characterized in that: The frame is provided with an end cover guide rail, and the end cover placement platform can move from the end cover upper material position to the end cover pressing position through the end cover guide rail; The end cover placement platform is a single-side opening structure, and the opening direction is along the guide rail toward the end cover press-fitting position.

7. The automatic press-fitting device for stator end cover according to claim 6, characterized in that: The end cover positioning structure includes an end cover stopper and an end cover positioning pin which are arranged coaxially with the end cover; the end cover stopper is a raised arc with a single-side opening, or at least two sections of raised arcs; the end cover positioning pin is arranged above the end cover placement platform.

8. The automatic press-fitting device for stator end cover according to claim 7, characterized in that: The end cover stopper is provided with at least two levels of stops with gradually increasing heights in a stepped manner from the axis to the outside.

9. The automatic press-fitting device for stator end cover according to claim 7, characterized in that: The end cover positioning structure also includes at least two spring positioning pins which are arranged concentrically and with different diameters.

10. The automatic press-fitting device for stator end cover according to claim 6, characterized in that: The frame is provided with a stator guide rail, and the stator placement table can move from the stator loading position to the press-fitting working position through the stator guide rail; The stator placement platform is provided with a first sensor; the end cover placement platform is provided with a second sensor.

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