Expansion clamping mechanism

Abstract

The utility model discloses an expanding and clamping mechanism, belongs to the field of centering and clamping tools of motor stators or cylindrical parts, and aims to reduce the risk of clamping deformation. Comprising expansion flaps, expansion flap retainers, a driving shaft and transition strip mounting bodies. The transition strip installation body is in a circular truncated cone shape. A plurality of slots are uniformly distributed in the circumferential direction of the transition strip mounting body; transition strips are inserted into the insertion grooves, and a clamping groove is formed between every two adjacent transition strips; arc surfaces are arranged on the outer sides of the expansion petals; the expansion petal driving assembly is coaxially and movably inserted into an inner cavity of the expansion petal retaining body in the vertical direction, the inner ends of the expansion petals penetrate through the guide grooves in the radial direction of the expansion petal retaining body and are inserted into the clamping grooves, the transition strips are inserted into the inclined grooves of the corresponding expansion petals along the two annular sides, and a sliding pair is formed between the expansion petals and the clamping grooves in the extending direction of the clamping grooves. The plurality of expansion petals move synchronously to expand the plurality of expansion petals outwards at the same time to center and clamp the stator from the inner side of the stator, and the outward acting force of each expansion petal is balanced, so that the centering and clamping are stable and reliable, and the risk of clamping deformation is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of centering and clamping tools for motor stators or cylindrical parts, in particular to an expansion and clamping mechanism. Background Art

[0002] At present, during the production process, the motor stator needs to be clamped with high precision in the process links such as paper insertion, wire insertion, and welding to ensure the accuracy of the position. At present, the stator is usually clamped by a clamping mechanism, which usually includes an annular clamping table, and the interior of the annular clamping table is provided with a plurality of electric telescopic rods distributed in an annular manner. The electric telescopic rod includes a telescopic end, and the outer wall of the annular clamping table is provided with a plurality of through-hole blocks distributed in an annular manner, and one end of the telescopic end penetrates the through-hole block and extends to the outside of the annular clamping table, and a rubber anti-sliding block is provided at the end of the telescopic end. The electric telescopic rod drives the telescopic end to telescope outward, so that the telescopic end moves from the through-hole block to the outside of the annular clamping table, and adjusts the distance between the telescopic end and the inner wall of the motor stator by telescoping, so that the rubber anti-sliding block at the telescopic end contacts the inner wall of the motor stator. The restriction of the inner wall at the four telescopic ends can restrict the motor stator from being clamped. However, considering that the stator is composed of many thin silicon steel sheets stacked together, there is a risk of clamping deformation when using the telescopic end. Utility Model Content

[0003] The utility model aims to provide an expansion clamping mechanism to reduce the risk of clamping deformation.

[0004] The technical solution adopted by the utility model is: an expansion and clamping mechanism, including expansion petals, an expansion petal driving assembly and an expansion petal retaining body; the expansion petal driving assembly includes a driving shaft, a transition strip and a transition strip mounting body; the transition strip mounting body is in a truncated cone shape, and its outer circumferential surface is a conical surface that gradually inclines inward from bottom to top; the transition strip mounting body is coaxially sleeved on the driving shaft; a plurality of slots are evenly distributed along the circumference of the transition strip mounting body, and the slots extend from the top end of the transition strip mounting body through the bottom end; the transition strip is inserted into the slot, and a card slot is formed between two adjacent transition strips; one expansion petal is clamped in one card slot; the inner side surface of the expansion petal is gradually inclining inward from the bottom end to the top end An inclined wedge surface, and the inclination of the inclined wedge surface is consistent with the inclination of the outer circumferential surface of the transition strip mounting body; an arc surface adapted to the inner wall of the stator is provided on the outer side of the expansion petal; inclined grooves are provided at relative positions on both sides of the expansion petal; the expansion petal retaining body is in the shape of a hollow cylinder, and a guide groove radially penetrating the inner cavity is provided on its side wall; the expansion petal retaining body is supported on the mounting plate through a mounting seat; the expansion petal driving assembly is coaxially and vertically movably inserted into the inner cavity of the expansion petal retaining body, the inner end of the expansion petal radially passes through the guide groove along the expansion petal retaining body and is inserted into the card slot, and the transition strip is inserted into the inclined groove of the corresponding expansion petal along both sides of the annular direction, and a sliding pair is formed between the expansion petal and the card slot along the extension direction of the card slot.

[0005] Furthermore, the drive shaft is an integrated part, including a shaft and an upper limit platform expanded at the top of the shaft; the transition strip mounting body is coaxially mounted on the shaft; a lower limit platform is coaxially mounted on the shaft; the transition strip mounting body is clamped between the upper limit platform and the lower limit platform.

[0006] Furthermore, the upper limit platform is an upper cone; the lower limit platform is a lower cone, and the outer peripheral surfaces of the upper cone, the transition strip mounting body and the lower cone form the same conical surface which gradually inclines from bottom to top.

[0007] Furthermore, the upper cone and the transition bar mounting body are connected via vertically arranged screws, and the lower cone and the transition bar mounting body are connected via vertically arranged screws; a liner is also mounted on the outer periphery of the shaft rod, and a locking thread ring is arranged at the bottom end of the shaft rod, and the locking thread ring is used to axially tighten the bottom end of the liner against the bottom end surface of the lower cone.

[0008] Furthermore, it comprises a driving cylinder, the top end of the piston rod of the driving cylinder and the bottom end of the driving shaft are assembled together through a connector.

[0009] Furthermore, the driving cylinder is connected below the mounting plate via a column.

[0010] Furthermore, a stator positioning platform is arranged on the mounting plate; the top surface of the mounting plate radially includes an inner ring surface of the inner ring and an outer ring surface located on the outer periphery of the inner ring surface, and a limiting step surface is formed between the inner ring surface and the outer ring surface for transition from the inner ring surface to the outer ring surface; the stator positioning platform is supported on the outer ring surface of the mounting plate, and the limiting step surface cooperates with the inner side wall of the stator positioning platform to form a limit.

[0011] The beneficial effects of the utility model are as follows: the multiple expanding petals are driven to expand outward and retract inward by the up and down movement of the expanding petal driving assembly, and the multiple expanding petals move synchronously, and the multiple expanding petals are simultaneously expanded outward to perform centering clamping on the stator from the inside of the stator. The outward forces of the various expanding petals are balanced, so that the tensioning force on the stator upward along the ring remains balanced. At the same time, the contact area between the expanding petals and the stator is large, and the force is dispersed, so that the centering clamping is stable and reliable, and the risk of clamping deformation is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the stator centering and clamping structure of the utility model;

[0014] Figure 3 This is a cross-sectional view of the utility model used for stator centering and clamping;

[0015] Figure 4 It is a schematic diagram of the transition strip installation structure;

[0016] Figure 5 A schematic diagram of the transition strip being installed on the transition strip installation body structure;

[0017] Figure 6 It is a cross-sectional view of the petal expansion drive assembly;

[0018] Figure 7 This is a schematic diagram of the expansion petal assembly;

[0019] Figure 8 It is a top view of the petal;

[0020] Fig. 9 This is a cross-sectional view of the mounting plate.

[0021] In the figure, there are driving cylinder 1, connecting head 2, column 3, mounting plate 4, inner annular surface 4A, outer annular surface 4B, limiting step surface 4C, stator positioning platform 5, mounting seat 6, stator 7, petal expansion driving assembly 8, driving shaft 8A, shaft rod 8A1, upper cone 8A2, transition bar 8B, transition bar mounting body 8C, slot 8C1, lower cone 8D, liner 8E, locking thread ring 8F, card slot 8G, petal expansion retaining body 9, guide groove 9A, petal expansion 10, inclined wedge surface 10A, arc surface 10B, inclined groove 10C. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0023] Clamping mechanism, such as Figure 1 and Figure 2 As shown, it includes a petal expansion 10, a petal expansion drive assembly 8 and a petal expansion retaining body 9; the petal expansion drive assembly 8 includes a drive shaft 8A, a transition bar 8B and a transition bar mounting body 8C; Figure 4 or Figure 5 As shown, the transition bar installation body 8C is in the shape of a truncated cone, and its outer circumference is a conical surface that gradually inclines from bottom to top, that is, the top surface and the bottom surface of the transition bar installation body 8C are coaxial circular surfaces, and the diameter of the top surface is smaller than the diameter of the bottom surface. The transition bar installation body 8C is coaxially sleeved on the drive shaft 8A; a plurality of slots 8C1 are evenly distributed along the circumference of the transition bar installation body 8C, and the slots 8C1 extend from the top end of the transition bar installation body 8C through the bottom end; the transition bar 8B is inserted into the slot 8C1, and a slot 8G is formed between two adjacent transition bars 8B; one slot 8G is configured with a flap 10. During assembly, the transition bar 8B is slidably inserted into the slot 8C1 from the top slot of the slot 8C1, or slidably inserted into the slot 8C1 from the bottom slot of the slot 8C1.

[0024] In this embodiment, the portion closer to the center of the transition strip installation body 8C along the radial direction of the transition strip installation body 8C is the “inner” portion, and the portion farther from the center of the transition strip installation body 8C is the “outer” portion.

[0025] like Figure 8 As shown, the inner side surface of the petal 10 is an inclined wedge surface 10A which is gradually inclined inward from the bottom end to the top end, and the inclination of the inclined wedge surface 10A is consistent with the inclination of the outer peripheral surface of the transition strip mounting body 8C; the outer side of the petal 10 is provided with an arc surface 10B adapted to the inner side wall of the stator; and inclined grooves 10C are provided at opposite positions on both sides of the petal 10;

[0026] The petal-expanding retaining body 9 is in a hollow cylindrical shape, and its side wall is provided with a guide groove 9A that penetrates the inner cavity in the radial direction; the number of the guide grooves 9A is the same as the number of the slots 8G; the petal-expanding retaining body 9 is supported on the mounting plate 4 through the mounting seat 6. The outer circumference of the petal-expanding retaining body 9 and the stator 7 are matched with the shaft hole with a large gap, that is, the outer circumference of the petal-expanding retaining body 9 is circular, and the diameter of the inner hole of the stator 7 is larger than the diameter of the outer circumference of the petal-expanding retaining body 9.

[0027] The petal expansion drive assembly 8 is coaxially and vertically movably plugged into the inner cavity of the petal expansion holding body 9, that is, the petal expansion drive assembly 8 can move vertically up and down in the inner cavity of the petal expansion holding body 9. Figure 7 As shown, the inner end of the expansion petal 10 moves radially along the expansion petal retaining body 9 through the guide groove 9A and is inserted into the clamping groove 8G, that is, the expansion petal 10 can move radially in the guide groove 9A. The transition strip 8B is inserted into the corresponding inclined groove 10C of the expansion petal 10 along both sides of the annular direction. In this way, the two sides of the transition strip 8B are inserted into the corresponding inclined groove 10C of the expansion petal 10, and they are mutually limited to prevent the expansion petal 10 from being pulled out of the clamping groove 8G in the radial direction. A sliding pair is formed between the expansion petal 10 and the clamping groove 8G along the extension direction of the clamping groove 8G, that is, along the extension direction of the clamping groove 8G, the clamping groove 8G and the expansion petal 10 can slide relative to each other.

[0028] During the specific operation, first, the stator 7 is arranged so that the stator 7 is sleeved on the outer circumference of the petal retaining body 9;

[0029] Next, the drive shaft 8A is pushed upward vertically, and the drive shaft 8A moves upward, driving the transition bar 8B and the transition bar mounting body 8C installed on the top of the drive shaft 8A to move upward. Under the restriction of the guide groove 9A of the petal retaining body 9, the petals 10 cannot move upward with the drive shaft 8A. However, since the transition bar mounting body 8C is in a truncated cone shape, and its outer peripheral surface is the bottom surface of the slot 8G, the slot 8G slides relative to the inclined wedge surface 10A through the upward movement of the transition bar mounting body 8C, thereby pushing multiple petals 10 to open outward at the same time, and the petals 10 extend outward until their arc surface 10B contacts the stator to center and clamp the stator from the inside of the stator. When the production is completed, the drive shaft 8A is moved downward vertically, driving the transition bar 8B and the transition bar mounting body 8C installed on the top of the drive shaft 8A to move downward, and the petals 10 slide in the slot 8G, thereby driving each petal 10 to retract along the guide groove 9A of the petal retaining body 9, and releasing the clamping of the stator.

[0030] The multiple expansion petals 10 of the expansion and clamping mechanism are simultaneously stretched outward to clamp the stator from the inside of the stator in a centering manner. The outward forces of the expansion petals 10 are balanced, so that the tensioning force on the stator upward along the ring remains balanced. At the same time, the contact area between the expansion petals and the stator is large, which disperses the force, making the centering clamping stable and reliable and avoiding the risk of clamping deformation.

[0031] The drive shaft 8A can be an optical shaft, and the transition bar mounting body 8C is fixed to the drive shaft 8A by means of a pin, a key, or the like. Since the transition bar 8B is inserted into the slot 8C1 and a card slot 8G is formed between two adjacent transition bars 8B, the two ends of the slot 8C1 are connected. If there is no limit structure at the top and bottom ends of the slot 8C1, there is a risk that the transition bar 8B and the card slot 8G will slide relative to each other and become detached. In order to avoid this problem, in this embodiment, if Figure 6 As shown, the driving shaft 8A is an integral part, including a shaft 8A1 and an upper limit platform expanded at the top of the shaft 8A1; the transition bar installation body 8C is coaxially mounted on the shaft 8A1; a lower limit platform is coaxially mounted on the shaft 8A1; the transition bar installation body 8C is clamped between the upper limit platform and the lower limit platform. This structure facilitates the assembly and disassembly of the transition bar installation body 8C by clamping the transition bar installation body 8C relatively between the upper limit platform and the lower limit platform; furthermore, the upper limit platform is limited at the top of the slot 8G to prevent the transition bar 8B from falling out of the top of the slot 8C1, and the lower limit platform is limited at the bottom of the slot 8G to prevent the transition bar 8B from falling out of the top of the slot 8C1.

[0032] In order to extend the axial contact length of the inclined wedge surface 10A of the expanding petal 10 with the expanding petal driving assembly 8 and improve the stability of the expanding petal 10, preferably, the upper limit platform is an upper cone 8A2; the lower limit platform is a lower cone 8D, and the outer peripheral surfaces of the upper cone 8A2, the transition strip mounting body 8C and the lower cone 8D form the same conical surface which is gradually inclined inward from bottom to top.

[0033] The upper cone 8A2 is connected to the transition bar installation body 8C by vertically arranged screws, and the lower cone 8D is connected to the transition bar installation body 8C by vertically arranged screws; a liner 8E is also sleeved on the outer periphery of the shaft rod 8A1, and a locking thread ring 8F is arranged at the bottom end of the shaft rod 8A1, and the locking thread ring 8F is used to axially tighten the bottom end of the liner 8E to press against the bottom end surface of the lower cone 8D. The locking thread ring 8F is tightened to act on the bottom end of the liner 8E, and the liner 8E transmits axial force to tightly press the lower cone 8D against the transition bar installation body 8C. The liner 8E is sleeved on the shaft rod 8A1, and together with the shaft rod 8A1, it is beneficial to improve the strength of the drive shaft 8A.

[0034] In order to facilitate the up and down movement of the driving shaft 8A, a driving cylinder 1 is included, and the driving cylinder 1 is connected to the bottom of the mounting plate 4 through a column 3.

[0035] The top end of the piston rod of the driving cylinder 1 and the bottom end of the driving shaft 8A are assembled together through a connector 2.

[0036] To facilitate the installation of the stator, Fig. 9 As shown, a stator positioning platform 5 is arranged on the mounting plate 4; the top surface of the mounting plate 4 includes an inner ring surface 4A of the inner ring and an outer ring surface 4B located on the outer periphery of the inner ring surface in the radial direction, and a limiting step surface 4C is formed between the inner ring surface 4A and the outer ring surface 4B to transition from the inner ring surface 4A to the outer ring surface 4B; the stator positioning platform 5 is supported on the outer ring surface of the mounting plate 4, and the limiting step surface 4C cooperates with the inner side wall of the stator positioning platform 5 to form a limit.

Claims

1. The clamping mechanism is characterized by: It comprises an expanding petal (10), an expanding petal driving assembly (8) and an expanding petal retaining body (9); The petal expansion drive assembly (8) comprises a drive shaft (8A), a transition bar (8B) and a transition bar mounting body (8C); The transition bar installation body (8C) is in the shape of a truncated cone, and its outer peripheral surface is a conical surface that gradually inclines inward from bottom to top; the transition bar installation body (8C) is coaxially sleeved on the drive shaft (8A); a plurality of slots (8C1) are evenly distributed along the circumference of the transition bar installation body (8C), and the slots (8C1) extend from the top end to the bottom end of the transition bar installation body (8C); the transition bar (8B) is inserted into the slots (8C1), and a slot (8G) is formed between two adjacent transition bars (8B); and a petal (10) is stuck in a slot (8G); The inner side surface of the expansion lobe (10) is an inclined wedge surface (10A) which gradually inclines inward from the bottom end to the top end, and the inclination of the inclined wedge surface (10A) is consistent with the inclination of the outer peripheral surface of the transition strip mounting body (8C); the outer side of the expansion lobe (10) is provided with an arc surface (10B) which is adapted to the inner side wall of the stator; and inclined grooves (10C) are provided at opposite positions on both sides of the expansion lobe (10); The petal expansion retaining body (9) is in the shape of a hollow cylinder, and its side wall is provided with a guide groove (9A) that radially penetrates the inner cavity; the petal expansion retaining body (9) is supported on the mounting plate (4) via the mounting seat (6); The petal expansion drive assembly (8) is coaxially and vertically movably plugged into the inner cavity of the petal expansion retaining body (9); the inner end of the petal expansion (10) radially passes through the guide groove (9A) of the petal expansion retaining body (9) and is plugged into the clamping groove (8G); the transition strip (8B) is plugged into the inclined groove (10C) of the corresponding petal expansion (10) along both sides of the annular direction, and a sliding pair is formed between the petal expansion (10) and the clamping groove (8G) along the extension direction of the clamping groove (8G).

2. The clamping mechanism according to claim 1, characterized in that: The driving shaft (8A) is an integral part, comprising a shaft (8A1) and an upper limit platform expanded at the top of the shaft (8A1); the transition strip mounting body (8C) is coaxially sleeved on the shaft (8A1); a lower limit platform is coaxially sleeved on the shaft (8A1); and the transition strip mounting body (8C) is clamped between the upper limit platform and the lower limit platform.

3. The clamping mechanism according to claim 2, characterized in that: The upper limit platform is an upper cone (8A2); the lower limit platform is a lower cone (8D); the outer peripheral surfaces of the upper cone (8A2), the transition strip mounting body (8C) and the lower cone (8D) form a same cone surface which gradually inclines from bottom to top.

4. The clamping mechanism according to claim 3, characterized in that: The upper cone (8A2) and the transition bar mounting body (8C) are connected via vertically arranged screws, and the lower cone (8D) and the transition bar mounting body (8C) are connected via vertically arranged screws; a liner (8E) is also sleeved on the outer periphery of the shaft rod (8A1), and a locking thread ring (8F) is arranged at the bottom end of the shaft rod (8A1), and the locking thread ring (8F) is used to axially tighten the bottom end of the liner (8E) so that it is pressed against the bottom end surface of the lower cone (8D).

5. The clamping mechanism according to any one of claims 1 to 4, characterized in that: It comprises a driving cylinder (1), wherein the top end of a piston rod of the driving cylinder (1) and the bottom end of a driving shaft (8A) are assembled together via a connector (2).

6. The clamping mechanism according to claim 5, characterized in that: The driving cylinder (1) is connected below the mounting plate (4) via a column (3).

7. The clamping mechanism according to any one of claims 1 to 4, characterized in that: A stator positioning platform (5) is arranged on the mounting plate (4); The top surface of the mounting plate (4) includes an inner ring surface (4A) of the inner ring and an outer ring surface (4B) located on the outer periphery of the inner ring surface in the radial direction, and a limiting step surface (4C) is formed between the inner ring surface (4A) and the outer ring surface (4B) for transition from the inner ring surface (4A) to the outer ring surface (4B); The stator positioning platform (5) is supported on the outer ring surface of the mounting plate (4), and the limiting step surface (4C) cooperates with the inner side wall of the stator positioning platform (5) to form a limit.

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