A core pressing device for servo motor processing

Abstract

The present invention relates to the field of motor processing, and in particular to an iron core pressing device for servo motor processing, comprising a processing table, wherein a pressure cover for pressing a casing downward and a top shaft for lifting a stator iron core upward into the casing are provided on the processing table, and a coaxial holding mechanism is also provided on the processing table, wherein the coaxial holding mechanism comprises a guide component for guiding the movement of the stator iron core and a clamping component for positioning the casing. When the stator iron core is limited by the guide component, the casing is positioned by the clamping component so that the stator iron core and the casing remain coaxial. The present invention ensures that the stator iron core is lifted straight along a predetermined path and is pressed into the casing through the coaxial holding mechanism, that is, the horizontal movement of the stator iron core is first limited by the guide component, and then the casing is positioned to be coaxial with the stator iron core by the clamping component in cooperation with the guide component, so as to ensure that the stator iron core can be accurately embedded in the casing, prepare for the pressing process, and improve the pressing accuracy.

Description

Technical Field

[0001] The invention relates to the field of motor processing, and in particular to an iron core press-fitting device for processing a servo motor. Background Art

[0002] In the motor manufacturing industry, the shrink fitting process is a common method for assembling the stator core and the casing. The so-called shrink fitting process is to first heat the casing so that the inner diameter of the casing becomes larger after deformation due to the heat, thereby forming a clearance fit with the stator. As the temperature of the casing drops, the clearance fit becomes an interference fit, so that the casing is firmly fitted on the outer wall of the stator core. However, in the prior art, the casing is usually shrink fitted directly on the stator core. In this way, the coaxiality of the stator core and the casing is difficult to ensure, and the axial and radial distances between the stator core and the casing are difficult to meet the requirements, which will cause a series of problems such as the casing not being properly assembled and the casing being inconsistently tight on the stator core. Reprocessing and shrink fitting the casing will greatly increase the cost.

[0003] The currently disclosed Chinese patent CN110504801B is a shrink-fit positioning device for a motor stator core and a housing, which is used for assembly and positioning of the motor stator core and the housing under a shrink-fit process. The housing includes a housing, a first opening opened at one end of the housing, an end cover arranged at the other end of the housing, and an axial hole opened on the end cover. The stator core can be embedded in the housing from the first opening. The positioning device includes a base, a first mounting platform arranged on the base, a first positioning component sleeved on the first mounting platform and coaxially arranged with the first mounting platform, and a second positioning component embedded in the first positioning component and coaxially arranged with the first positioning component. The first positioning component can be embedded in the stator core in a cooperative manner, one end of the second positioning component is connected to the axis center of the first mounting platform, and the other end can be cooperatively penetrated into the axial hole.

[0004] According to the above patent, the above patent can effectively position the casing and the stator core to ensure the coaxiality between the stator core and the casing by setting the first positioning component and the second positioning component. However, the first positioning component and the second positioning component cannot adapt to the size deviation of the casing and the stator core, so that the coaxial positioning between the casing and the stator core will still be inaccurate. Therefore, there is a need for a pressing device that can improve the adaptability of the positioning component and ensure the coaxiality between the stator core and the casing. Summary of the invention

[0005] In view of the problems existing in the prior art, a core pressing device for servo motor processing is provided. The present invention ensures that the stator core is lifted straight along a predetermined path and is pressed into a casing through a coaxial holding mechanism, that is, the horizontal movement of the stator core is first restricted by a guide assembly, and then the casing is positioned to be coaxial with the stator core through a clamping assembly in cooperation with the guide assembly, thereby ensuring that the stator core can be accurately embedded in the casing, preparing for the pressing process and improving the pressing accuracy.

[0006] In order to solve the problems of the prior art, the present invention provides a core pressing device for servo motor processing, including a processing table for assembling the stator core and the casing of the servo motor under the shrink fitting process, the processing table is provided with a pressure cover for pressing the casing downward, and a top shaft for lifting the stator core upward into the casing, and the processing table is also provided with a coaxial holding mechanism located between the pressure cover and the top pin, the coaxial holding mechanism includes a guide assembly for guiding the stator core to move along the lifting path, and a clamping assembly for positioning the casing in cooperation with the guide assembly, when the stator core is limited by the guide assembly, the casing is positioned above the stator core by the clamping assembly, so that the stator core and the casing maintain a coaxial state.

[0007] Preferably, the processing table has a lower support plate for installing the guide assembly, the guide assembly includes a plurality of guide rods evenly distributed around the top shaft, the length direction of the guide rods is parallel to the axial direction of the top shaft, and the lower support plate is provided with a driver for driving all guide rods to move synchronously.

[0008] Preferably, each guide rod has a sliding rod horizontally extending outwards and slidably arranged on the lower support plate, and the sliding rod has a contact surface for supporting the housing.

[0009] Preferably, the clamping assembly comprises a clamping rod arranged on each sliding rod, and the length direction of the clamping rod is parallel to the length direction of the guide rod.

[0010] Preferably, each clamping rod has an extension rod extending horizontally outward and slidably arranged on the sliding rod. The extension rod can move relative to the sliding rod in its extension direction. A spring is fixedly connected between the extension rod and the sliding rod. When the casing is placed on the contact surface of the sliding rod, all the clamping rods adaptively clamp the casing through the action of the springs, so that the stator core and the casing are adaptively coaxial.

[0011] Preferably, an airbag surrounding all the clamping rods is provided above the lower support plate, and an upper support plate for installing the airbag is provided on the processing table. The upper support plate is provided with an inflation interface connected to the airbag. When the airbag is inflated, all the clamping rods are in a state of further stably clamping the casing under the expansion and squeezing of the airbag.

[0012] Preferably, the guide rod is provided with a pulley capable of contacting the surface of the stator core, and when the pulley is in sliding contact with the stator core, a gap is left between the surface of the guide rod and the surface of the stator core.

[0013] Preferably, the upper ends of the clamping rods have inclined surfaces that can be used to guide the housing into all the clamping rods.

[0014] Preferably, a rubber sleeve that can adapt to the size of the inner wall of the stator core is sleeved on the top shaft.

[0015] Preferably, the top shaft is provided with an air relief passage along its axial direction to achieve a pressure relief effect.

[0016] Compared with the prior art, the present application has the following beneficial effects: the present invention ensures that the stator core is lifted straight along a predetermined path and is press-fitted into the casing through a coaxial retaining mechanism, that is, the horizontal movement of the stator core is first restricted by a guide assembly, and then the casing is positioned to be coaxial with the stator core through a clamping assembly in cooperation with the guide assembly, thereby ensuring that the stator core can be accurately embedded in the casing, preparing for the press-fitting process, and improving the press-fitting accuracy. Meanwhile, during the press-fitting process, the pressure cover abuts against the casing, ensuring close contact during the shrink-fitting process, avoiding misalignment, and enabling the casing to be smoothly shrink-fitted onto the stator core, thereby ensuring high-precision assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a three-dimensional structural schematic diagram of an iron core press-fitting device for processing a servo motor.

[0018] Figure 2 The present invention is a partial three-dimensional structural cross-sectional view of an iron core press-fitting device for processing a servo motor.

[0019] Figure 3 The present invention is a schematic diagram of the state where the air bag of the iron core press-fitting equipment used for servo motor processing is not expanded.

[0020] Figure 4 The present invention is a schematic diagram of a state in which an air bag of an iron core press-fitting device for processing a servo motor is inflated.

[0021] Figure 5 The present invention is a schematic diagram of the state in which the stator core of the core pressing equipment for servo motor processing is embedded in the casing.

[0022] Figure 6 The present invention is a three-dimensional structural diagram showing the top surface orientation of a coaxial holding mechanism of an iron core press-fitting device for processing a servo motor.

[0023] Figure 7 The present invention is a three-dimensional structural schematic diagram showing the bottom surface orientation of a coaxial holding mechanism of an iron core press-fitting device for processing a servo motor.

[0024] Figure 8A plan view of a guide rod and a driver of a core press-fitting device for processing a servo motor.

[0025] Fig. 9 The present invention is a partial three-dimensional structural schematic diagram of a coaxial holding mechanism of an iron core press-fitting device for processing a servo motor.

[0026] Fig.10 yes Fig. 9 An enlarged schematic diagram of point A.

[0027] The numbers in the figure are: 1. stator core; 2. casing; 3. processing table; 31. lower support plate; 32. upper support plate; 4. pressure cover; 41. lower pressure cylinder; 42. hot air port; 5. top shaft; 51. rubber bushing; 52. air release channel; 6. guide assembly; 61. guide rod; 611. sliding rod; 6111. plug rod; 612. pulley; 62. drive; 621. rotating ring; 622. connecting rod; 7. clamping assembly; 71. clamping rod; 711. extension rod; 712. spring; 72. air bag; 721. inflation interface. DETAILED DESCRIPTION

[0028] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] See also Figure 1-Figure 5 As shown, a core pressing device for processing a servo motor comprises a processing table 3 for assembling a stator core 1 and a casing 2 of the servo motor under a shrink fitting process, the processing table 3 is provided with a pressure cover 4 for pressing the casing 2 downward, and a top shaft 5 for lifting the stator core 1 upward into the casing 2, the processing table 3 is also provided with a coaxial holding mechanism located between the pressure cover 4 and the top pin, the coaxial holding mechanism comprises a guide assembly 6 for guiding the stator core 1 to move along a lifting path, and a clamping assembly 7 for positioning the casing 2 in cooperation with the guide assembly 6, when the stator core 1 is limited by the guide assembly 6, the casing 2 is positioned above the stator core 1 by the clamping assembly 7, so that the stator core 1 and the casing 2 maintain a coaxial state.

[0030] The processing table 3 is respectively provided with a pressing cylinder 41 and a lifting cylinder for driving the pressure cover 4 and the top shaft 5. The lifting cylinder is not shown in the figure. The pressure cover 4 is provided with a hot air port 42 that can introduce hot air into the casing 2. When the stator core 1 is pressed into the casing 2, first, the stator core 1 of the servo motor is placed and sleeved on the top shaft 5. At this time, the stator core 1 is accurately limited in its rising path by the guide component 6 of the coaxial holding mechanism, ensuring its linearity and accuracy in subsequent actions. Then, the casing 2 is placed in the clamping component 7 above the stator core 1. The casing 2 is accurately positioned directly above the stator core 1 through the clamping component 7 to ensure that the two are coaxial. At this time, the stator core 1 is in a movable state relative to the casing 2. Before the stator core 1 is lifted upward, hot air is introduced into the casing 2 through the hot air port 42, and the casing 2 is heated first, using the principle of thermal expansion and contraction to prepare for the shrink-fit. At this time, the material of the casing 2 becomes slightly softened, which is convenient for press-fitting. As the shrink-fitting begins, the top shaft 5 is started by the lifting cylinder to push the stator core 1 to slowly rise along a predetermined ascending path. At the same time, the pressure cover 4 contacts the casing 2 through the pressing cylinder 41 to prevent the casing 2 from overcoming the clamping assembly 7 and moving upward during the lifting of the stator core 1, so that the casing 2 is sleeved on the stator core 1. As the shrink-fitting process of the casing 2 proceeds, the stator core 1 and the casing 2 are closely fitted while maintaining coaxiality until the shrink-fitting process is completed and the stator core 1 is completely embedded in the casing 2.

[0031] See also Figure 2-Figure 8 As shown, the processing table 3 has a lower support plate 31 for installing the guide assembly 6, and the guide assembly 6 includes a plurality of guide rods 61 evenly distributed around the top shaft 5, and the length direction of the guide rods 61 is parallel to the axial direction of the top shaft 5. The lower support plate 31 is provided with a driver 62 for driving all the guide rods 61 to move synchronously.

[0032] The driver 62 has a rotating ring 621 coaxial with the top shaft 5, and a connecting rod 622 is hinged between each guide rod 61 and the rotating ring 621. The rotating ring 621 is rotatably mounted on the lower support plate 31. When the rotating ring 621 is controlled to rotate, the connecting rod 622 moves together. According to the rotation direction of the rotating ring 621, the guide rod 61 is controlled to approach or move away from the stator core 1. The rotating component for driving the rotating ring 621 is not shown in the figure. By synchronously controlling the activity state of all guide rods 61, the stator core 1 is limited between all guide rods 61, limiting the horizontal movement of the stator core 1, allowing the stator core 1 to move along the ascending path, thereby realizing precise guiding of the stator core 1. Through the precise regulation of the guide rod 61, the coaxial state of the moving straight line and the top shaft 5 is guaranteed.

[0033] See also Figure 3-Figure 5 and Fig.10As shown, each guide rod 61 has a sliding rod 611 horizontally extending outward and slidably disposed on the lower support plate 31 , and the sliding rod 611 has a contact surface for supporting the housing 2 .

[0034] After the stator core 1 is limited, during the process of placing the casing 2, as the end face of the casing 2 contacts the resistance surface on the sliding rod 611, the casing 2 is restricted in the clamping assembly 7. The casing 2 is supported by the sliding rod 611, which is beneficial for the pressing cover 4 to press down on the casing 2, so that the casing 2 is firmly positioned between the pressing cover 4 and the sliding rod 611.

[0035] See also Figure 3-Figure 5 and Fig.10 As shown, the clamping assembly 7 includes a clamping rod 71 arranged on each sliding rod 611 , and the length direction of the clamping rod 71 is parallel to the length direction of the guide rod 61 .

[0036] After the stator core 1 is precisely limited by the guide assembly 6, the casing 2 is precisely placed above the stator core 1. With the casing 2 in place, the casing 2 is now limited between all the clamping rods 71, and the casing 2 body is stably clamped. After the guide rod 61 contacts the stator core 1, the clamping rod 71 follows the guide rod 61 to move to a position where it can contact the casing 2, so that the casing 2 can be limited between all the clamping rods 71, maintaining the coaxial state between the casing 2 and the stator core 1, thereby improving the accuracy of the stator core 1 being pressed into the casing 2.

[0037] See also Figure 3-Figure 5 and Fig.10 As shown, each clamping rod 71 has an extension rod 711 horizontally extending outward and slidably arranged on the sliding rod 611. The extension rod 711 can move relative to the sliding rod 611 in its extension direction. A spring 712 is fixedly connected between the extension rod 711 and the sliding rod 611. When the housing 2 is placed on the contact surface of the sliding rod 611, all the clamping rods 71 ​​adaptively clamp the housing 2 through the action of the spring 712, so that the stator core 1 and the housing 2 are adaptively coaxial.

[0038] The sliding rod 611 has an insertion rod 6111 that guides the extension rod 711. The extension rod 711 is slidably inserted into the insertion rod 6111 by opening a socket. The housing 2 is placed on the contact surface of the sliding rod 611. This action triggers the clamping mechanism. Since the housing 2 is inserted between all the clamping rods 71, the clamping rods 71 ​​begin to be pressed, so that the clamping rods 71 ​​are pushed outward. During this process, the spring 712 is gradually stretched until the housing 2 is completely placed. All the clamping rods 71 ​​apply pressure to the housing 2 through the force of the spring 712, and the position of the housing 2 is automatically adjusted so that the housing 2 remains in the center of all the clamping rods 71. This process ensures the precise alignment of the stator core 1 and the housing 2 to achieve coaxiality.

[0039] See also Figure 3-Figure 5 As shown, an air bag 72 surrounding all the clamping rods 71 ​​is provided above the lower support plate 31, and an upper support plate 32 for installing the air bag 72 is provided on the processing table 3. The upper support plate 32 is provided with an inflation interface 721 connected to the air bag 72. When the air bag 72 is inflated, all the clamping rods 71 ​​are in a state of further stably clamping the casing 2 under the expansion and squeezing of the air bag 72.

[0040] The inflation process is started, and gas flows into the interior of the airbag 72 through the inflation interface 721 of the airbag 72, causing the airbag 72 to begin to expand. As the airbag 72 expands, its volume increases, and the pressure on the surrounding environment also increases accordingly. Under the expansion force of the airbag 72, all clamping rods 71 ​​feel pressure, and this force applies pressure to the casing 2 along the expansion direction of the airbag 72, thereby clamping and fixing the casing 2 comprehensively. As the airbag 72 continues to expand, the clamping force continues to increase, and the casing 2 is clamped directly above the stator core 1, stably aligned, ensuring coaxiality, avoiding displacement during the process of the stator core 1 being lifted and embedded into the casing 2, and further stabilizing the casing 2.

[0041] See also Figure 3-Figure 5 As shown, the guide rod 61 has a pulley 612 that can contact the surface of the stator core 1. When the pulley 612 is in sliding contact with the stator core 1, a gap is left between the surface of the guide rod 61 and the surface of the stator core 1.

[0042] When the pulley 612 on the guide rod 61 contacts the stator core 1, the reserved gap prevents the guide rod 61 from directly contacting the surface of the stator core 1. During the rising process of the stator core 1, the direct effect of friction is reduced, the surface of the stator core 1 is protected from wear, and smooth sliding is maintained. For the stator core 1 with special coatings or sensitive materials, the reserved gap avoids physical damage, protects the special treatment layer, and improves the integrity of the assembly.

[0043] See also Fig. 9 and Fig.10As shown, the upper ends of the clamping rods 71 ​​have inclined surfaces that can be used to guide the housing 2 into all the clamping rods 71 ​​.

[0044] The inclination angle of the slope at the end of the clamping rod 71 helps the casing 2 to slide down naturally by gravity or driving force when entering, so that the casing 2 can be smoothly clamped between all the clamping rods 71, avoiding the need to adjust the clamping rods 71 ​​and forming a stable clamping force.

[0045] See also Figure 3-Figure 5 As shown, a rubber sleeve 51 which can adapt to the size of the inner wall of the stator core 1 is sleeved on the top shaft 5 .

[0046] The rubber sleeve 51 is made of a soft material and can effectively buffer the direct contact between the top shaft 5 and the inner wall of the stator core 1, avoiding hard friction between metal and metal, avoiding scratches, and protecting the surface integrity of the stator core 1. The rubber sleeve 51 can adapt to the inner hole of the stator core 1. Regardless of the slight size changes of the stator core 1, the rubber sleeve 51 can fit tightly with the stator core 1 to provide stable support.

[0047] See also Figure 3-Figure 5 As shown, the top shaft 5 is provided with a degassing passage 52 along its axial direction to achieve a pressure relief effect.

[0048] When the top shaft 5 is working, since the stator core 1 is pushed into the casing 2 and the pressure cover 4 is covered on the top of the casing 2, the pressure inside the casing 2 will increase, and the air leakage channel 52 can release the gas therein to maintain the internal pressure balance and prevent the internal pressure from being too high, thereby ensuring that the stator core 1 can be smoothly embedded in the casing 2.

[0049] The present invention ensures that the stator core 1 is lifted straight along a predetermined path and is press-fitted into the casing 2 through a coaxial holding mechanism, that is, the horizontal movement of the stator core 1 is first limited by the guide assembly 6, and then the casing 2 is positioned to be coaxial with the stator core 1 through the clamping assembly 7 in cooperation with the guide assembly 6, thereby ensuring that the stator core 1 can be accurately embedded in the casing 2, preparing for the press-fitting process, and improving the press-fitting accuracy. At the same time, during the press-fitting process, the pressure cover 4 abuts against the casing 2, ensuring close contact during the shrink-fitting process, avoiding misalignment, and allowing the casing 2 to be smoothly shrink-fitted onto the stator core 1, thereby ensuring high-precision assembly.

[0050] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A servo motor core press-fitting device, comprising a processing table (3) for assembling a stator core (1) and a housing (2) of the servo motor under a shrink-fit process, wherein the processing table (3) is provided with a pressure cover (4) for pressing the housing (2) downward, and a jacking shaft (5) for lifting the stator core (1) upward into the housing (2); It is characterized in that The processing table (3) is also provided with a coaxial holding mechanism located between the pressure cover (4) and the ejector pin, the coaxial holding mechanism comprising a guide assembly (6) for guiding the stator core (1) to move along a jacking path, and a clamping assembly (7) for cooperating with the guide assembly (6) to position the housing (2); When the stator core (1) is restrained by the guide assembly (6), the housing (2) is positioned above the stator core (1) by the clamping assembly (7), so that the stator core (1) and the housing (2) maintain a coaxial state; The processing table (3) is provided with a lower support plate (31) for mounting a guide assembly (6), the guide assembly (6) comprising a plurality of guide rods (61) uniformly distributed around the top shaft (5), the length direction of the guide rods (61) being parallel to the axial direction of the top shaft (5), and the lower support plate (31) is provided with a driver (62) for driving all the guide rods (61) to move synchronously; Each guide rod (61) has a sliding rod (611) extending outward horizontally and slidably disposed on the lower support plate (31), wherein the sliding rod (611) has a contact surface for supporting the housing (2); The clamping assembly (7) comprises a clamping rod (71) arranged on each sliding rod (611), wherein the length direction of the clamping rod (71) is parallel to the length direction of the guide rod (61); Each clamping rod (71) has an extension rod (711) extending outward horizontally and slidably arranged on the sliding rod (611); the extension rod (711) can move relative to the sliding rod (611) in its extension direction; a spring (712) is fixedly connected between the extension rod (711) and the sliding rod (611); when the housing (2) is placed on the contact surface of the sliding rod (611), all the clamping rods (71) adaptively clamp the housing (2) through the action of the spring (712), so that the stator core (1) and the housing (2) are adaptively coaxial; An air bag (72) is provided above the lower support plate (31) and surrounds all the clamping rods (71). An upper support plate (32) is provided on the processing table (3) for mounting the air bag (72). The upper support plate (32) is provided with an inflation interface (721) connected to the air bag (72). When the air bag (72) is inflated, all the clamping rods (71) are in a state of further stably clamping the casing (2) under the expansion and compression of the air bag (72).

2. The servo motor core press-fitting device according to claim 1, characterized in that: The guide rod (61) is provided with a pulley (612) capable of contacting the surface of the stator core (1). When the pulley (612) and the stator core (1) are in sliding contact, a gap is left between the surface of the guide rod (61) and the surface of the stator core (1).

3. The servo motor core press-fitting device according to claim 1, characterized in that: The upper ends of the clamping rods (71) have inclined surfaces that can be used to guide the housing (2) into all the clamping rods (71).

4. The servo motor core press-fitting device according to claim 1, characterized in that: The top shaft (5) is sleeved with a rubber shaft sleeve (51) that can adapt to the size of the inner wall of the stator iron core (1).

5. The servo motor core press-fitting device according to claim 4, characterized in that: The top shaft (5) is provided with a degassing passage (52) along its axial direction and capable of achieving a pressure relief effect.

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