Rotary can beading apparatus

Abstract

A rotary can beading apparatus is provided. A spindle of the rotary can beading apparatus comprises: a case having a first hollow part extending in an axial direction; a housing accommodated in the first hollow part to be rotatable with respect to the case and having a second hollow part having a smaller diameter than the case and extending in the axial direction; a shaft which extends in the axial direction while crossing the second hollow part to be slidably movable with respect to the housing in the axial direction, and the axial end of which is connected to a head; and a pair of sleeves inserted into one end and the other end in the axial direction of the second hollow part, respectively, and connected to the housing so that rotation thereof is restricted. The shaft is inserted into the pair of sleeves so that the shaft can slide in the axial direction and relative rotation thereof is restricted.

Description

Rotary can beading device

[0001] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0006989, dated January 16, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a can beading device, and more particularly, to a rotary can beading device having a spindle that can apply a thin and long shaft by maximally suppressing heat generation from the spindle, facilitating heat dissipation from the shaft, and minimizing bending moment or bending deformation of the shaft.

[0003] A rotary can beading device is a device that forms a beading portion around the open end of a side wall member of a cylindrical can while the can rotates around a rotary. The beading portion is processed after an electrode assembly is accommodated within the can, thereby fixing the electrode assembly accommodated within the can.

[0004] As cylindrical batteries have become larger in size, the thickness of the cans has also increased, as has the depth of beading. Consequently, the processing load and processing time have increased significantly during the manufacturing process.

[0005] As processing loads increase and processing times lengthen, conventional rotary can beading machines are experiencing various problems. The most significant of these is the excessive heat generated by the axial and rotational loads on the spindle. This heat causes excessive thermal expansion of the spindle shaft, causing the head height to deviate from the set height, thereby increasing the dimensional deviation of the molded product.

[0006] Furthermore, as machining loads significantly increase, securing the rigidity of the cantilever structure of the shaft, which slides vertically, becomes increasingly crucial. However, designing a shaft with a large cross-sectional area to ensure rigidity poses the problem of increasing the heat generated around the shaft, thereby increasing its thermal expansion.

[0007] Accordingly, a spindle structure is required that can secure the rigidity of the shaft while suppressing heat generation around the shaft and securing a larger length compared to the cross-sectional area of ​​the shaft.

[0008] The present invention has been devised to solve the above-described problems, and provides a spindle structure capable of suppressing the thermal expansion of the shaft while securing the rigidity of the shaft, and a rotary can beading device using the spindle structure.

[0009] The technical objectives of the present invention are not limited to the purposes mentioned above. Other objectives and advantages of the present invention not mentioned above can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0010] The present invention can be applied to a rotary can beading device including a rotary that rotates about a central axis, a plurality of arms that are arranged along the circumference of the rotary and extend in a radial direction so as to rotate together with the rotary, a head that is installed to be rotatable about the rotation axis on each of the arms and is installed to be slidable in the axial direction, a first rail cam having a first height profile that extends in the circumferential direction about the central axis, and a first cam follower that rises and falls together with the head and follows the first height profile to adjust the height of the head.

[0011] The above rotary can beading device may further include a plurality of can tables arranged along the circumference of the rotary and extending in the radial direction so as to rotate together with the rotary, a can support provided on a radially outer side of the can table so as to rotate together with the can table and installed rotatable with respect to the can table about the rotation axis, a second rail cam having a second height profile extending in the circumferential direction about the central axis, and a second cam follower that moves up and down together with the can support and follows the second height profile to adjust the height of the can support.

[0012] The rotary can beading device may further include a beading knife installed on each of the arms so as to be movable toward or away from the rotation axis, a third rail cam having a first radial profile extending circumferentially about the central axis, and a third cam follower that moves radially about the rotation axis together with the beading knife and follows the first radial profile to adjust a radial distance of the beading knife with respect to the rotation axis of the head.

[0013] The above rotary can beading device may further include a support roller disposed opposite the beading knife with the rotation axis therebetween, a fourth rail cam having a second radial profile extending circumferentially with respect to the central axis, and a fourth cam follower that moves radially with respect to the rotation axis together with the support roller and follows the second radial profile to adjust the radial distance of the support roller with respect to the rotation axis of the head.

[0014] The above rotary can beading device may include a first rail extending circumferentially about the central axis, and a first roller that ascends and descends together with the head and follows the first rail.

[0015] The height of the head in the first section in the circumferential direction can be determined by the first rail cam.

[0016] The height of the head in the second section that does not overlap the first section in the circumferential direction can be determined by the first rail.

[0017] The above rotary can beading device may include a second rail extending circumferentially about the central axis, and a second roller that ascends and descends together with the can holder and follows the second rail.

[0018] The height of the can table in the third section in the circumferential direction can be determined by the second rail cam. The height of the can table in the fourth section, which does not overlap the third section in the circumferential direction, can be determined by the first rail.

[0019] A spindle may be installed in each of the above arms so as to be rotatable around the above axis.

[0020] The spindle includes a case having a first hollow portion extending axially. The case can be fixed to the arm.

[0021] The spindle includes a housing that is received in the first hollow portion so as to be rotatable relative to the case and has a second hollow portion that extends axially and has a diameter smaller than that of the case.

[0022] The spindle includes a shaft extending axially across the second hollow portion so as to be rotatably constrained with the housing but axially slidable relative to the housing, and having an axial first end connected to the head.

[0023] The above head rotates by receiving the rotational force of the spindle and can move axially by the shaft.

[0024] Between the case and the housing, a bearing may be interposed to support rotation of the housing relative to the case.

[0025] The above bearing can be arranged radially between the case and the housing.

[0026] The bearing may be accommodated in the first hollow portion, with the radially outer side in contact with the inner circumference of the case and the radially inner side in contact with the outer circumference of the housing.

[0027] The above bearings may be provided in multiple numbers so as to be spaced apart from each other in the axial direction.

[0028] To solve the above-described problem, the present invention inserts a pair of sleeves into one axial end and the other axial end of the second hollow portion, respectively. Furthermore, the shaft is axially inserted into the pair of sleeves. The shaft is axially slidable relative to the sleeve, but is rotationally constrained with respect to the sleeve.

[0029] Then, since a pair of the above sleeves are respectively placed on both axial ends of the second hollow part, the maximum axial distance of the support point of the sleeve with respect to the shaft can be secured.

[0030] A pair of the above sleeves can be spaced apart from each other axially.

[0031] This allows the shaft to be exposed to the second hollow space between the pair of sleeves, thereby enhancing the cooling efficiency of the shaft. When relative axial movement occurs between the sleeve and the shaft while rotating at high speed, frictional heat is generated between the sleeve and the shaft. By spacing the two sleeves apart from each other, the frictional area between the sleeve and the shaft is reduced, thereby reducing the generation of frictional heat. Furthermore, a path is secured for the shaft, which requires reliable cooling, to directly dissipate heat without passing through the sleeve in the radial direction.

[0032] The distance between the axial inner ends of the pair of sleeves may be set to be 1 / 6 or more and 1 / 3 or less of the distance between the axial outer ends of the pair of sleeves. If the ratio is 1 / 6 or less, the effect of the sleeve supporting the bending deformation of the shaft is hardly increased, while the cooling efficiency of the shaft is reduced. If the ratio is 1 / 3 or more, the cooling efficiency of the shaft is hardly increased, while the effect of the sleeve supporting the bending deformation of the shaft is reduced.

[0033] The ratio of the axial lengths of each of the pair of sleeves may be 0.9 to 1.1. That is, the axial length of one sleeve may be set to be no longer or shorter than the axial length of the other sleeve by more than 10%. Accordingly, a large bending moment may not be generated in the elongated and thin sleeve.

[0034] The distance between the axial inner ends of a pair of said sleeves may be 1.0 to 2.0 times the average diameter of the shaft. The average diameter of the shaft means the diameter of a circle having an area substantially equal to the area of ​​a cross-section of an inner region defined by the outer circumferential surface of the shaft. If the above magnification is less than 1.0, the effect of the sleeve supporting the bending deformation of the shaft is hardly increased while the cooling efficiency of the shaft is reduced, and if the above magnification exceeds 2.0, the effect of the sleeve supporting the bending deformation of the shaft is hardly increased while the cooling efficiency of the shaft is poor.

[0035] By minimizing these bending deformations or bending moments, vibration of the sleeve rotating at high speed can be prevented.

[0036] The axial section of each of the sleeves in contact with the inner periphery of the housing may at least partially overlap with the axial section of the bearing in contact with the outer periphery of the housing.

[0037] Accordingly, the sleeve is firmly supported by the bearing so that it does not become radially eccentric, thereby preventing vibration of the sleeve rotating at high speed.

[0038] At least a portion of the axial section of each of the above bearings in contact with the outer periphery of the housing may be arranged outside the axial section between the pair of sleeves.

[0039] Accordingly, it is possible to form the side walls of the housing thinly.

[0040] If the axial section of the bearing in contact with the outer periphery of the housing is placed entirely within the axial section between the pair of sleeves, there is a risk that the housing may be deformed in that section, so it is necessary to increase the rigidity of the housing, which may increase the volume and mass of the rotating body and cause an increase in the amount of heat generated.

[0041] At least a portion of the axial section between the pair of sleeves may not overlap the section where the bearing contacts the outer periphery of the housing.

[0042] Then, the second hollow portion inside the housing faces the first hollow portion of the case with the side wall of the housing interposed therebetween in the radial direction. Accordingly, the heat emitted by the shaft in the space between the pair of sleeves can be discharged to the outside of the housing through the side wall of the housing.

[0043] In the above case, a through hole may be formed so that the first hollow space provided outside the housing communicates with the outside.

[0044] The above through hole can be arranged in a section between two axially adjacent bearings.

[0045] The above rotary can beading device can cause forced flow between the gas in the first hollow portion and the gas outside the case through the through hole. Accordingly, the cooling efficiency of the shaft can be significantly increased.

[0046] An axial hole may be provided at the center of the shaft, extending axially through the shaft. By arranging the axial hole in a thin and long manner at the center of the shaft, a cooling passage can be secured without significantly reducing the bending rigidity of the shaft.

[0047] The above rotary can beading device can cause forced flow of gas in the axial direction through the shaft hole.

[0048] According to the present invention, by applying a pair of spaced sleeves, the friction area between the shaft and the sleeve is reduced by the distance between the distances, compared to applying a single, long sleeve, while minimizing the increase in the bending moment acting on the shaft, thereby further reducing the cross-sectional area of ​​the shaft, and thus further reducing the contact area between the sleeve and the shaft, thereby further reducing the friction area between the shaft and the sleeve. In addition, since the shaft is not wrapped in the sleeve in the distance between the distances but is exposed to the second hollow portion, the cooling efficiency of the shaft can be improved.

[0049] According to the present invention, the required rigidity of the housing can be lowered through the arrangement relationship of a pair of sleeves spaced apart in the axial direction and a plurality of bearings spaced apart in the axial direction, and the cooling efficiency of the shaft can be further increased by allowing the space between the pair of sleeves to contact the first hollow portion of the case through the side wall of the housing.

[0050] According to the present invention, the rigidity of the shaft can be secured while reducing the amount of heat generated and promoting heat dissipation from the shaft, thereby improving the production quality of can beading processing.

[0051] In addition to the effects described above, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

[0052] Figures 1 and 2 are a top perspective view and a front view of the rotary can beading device of the embodiment.

[0053] Figure 3 is a top perspective view of Figure 1 with the upper frame omitted.

[0054] Fig. 4 is a bottom perspective view of the upper frame of the rotary can beading device of Fig. 1.

[0055] Figure 5 is a bottom perspective view of Figure 1 with the lower frame omitted.

[0056] Fig. 6 is a top perspective view of the lower frame of the rotary can beading device of Fig. 1.

[0057] Fig. 7 is a top perspective view of the lower frame and the rotary of the rotary can beading device of Fig. 1.

[0058] Figure 8 is a front cross-sectional view of the upper frame, lower frame, and rotary.

[0059] Figure 9 is a front cross-sectional view showing a state in which a can is supplied to a rotary can beading device.

[0060] Figure 10 is a front cross-sectional view showing a state in which a can is beaded in a rotary can beading device.

[0061] Fig. 11 is an enlarged cross-sectional view of the head, knife, and support roller portions of the rotary can beading device of the embodiment.

[0062] Figure 12 is a cross-sectional perspective view of the spindle.

[0063] Fig. 13 is a cross-sectional perspective view showing the shaft of the spindle of Fig. 12 omitted.

[0064] Figure 14 is an exploded perspective view of the spindle.

[0065] Figure 15 is a side cross-sectional view of the spindle.

[0066] Figure 16 is a perspective view showing the shaft support member and head installed on the upper and lower parts of the spindle, respectively.

[0067] Fig. 17 is a cross-sectional view taken along line XVII-XVII of Fig. 16.

[0068] [Explanation of symbols]

[0069] 1: Rotary can beading device 2: Can 10: Rotary 101: Central axis 12: Outer rotary 121: Table lifting guide 14: Inner rotary 141: Spindle drive support 143: Spindle drive part 145: Drive motor 147: Drive gear 16: Support rotary 17: Knife rail cam (third rail cam) 172: Knife radial position profile 20: Arm 21: Spindle support 22: Bearing 23: Shaft lifting guide 24: Shaft support member 242: Chamber 243: Suction hole 30: Spindle 300: Case 302: First hollow part 307: Through hole 301: Rotation axis 31: Housing 310: Second hollow part 32: Driven gear 33: Sleeve 34: Shaft 341: Shaft hole 35: Head cam follower (first cam follower) 37: Head 39: Head roller (first roller) 40: Beading knife 41: Knife support 42: Knife support shaft 43: Knife cam follower (third cam follower) 50: Support roller 51: Roller support 52: Roller support shaft 53: Support cam follower (fourth cam follower) 60: Can table 61: Can holder 62: Can cam follower (second cam follower) 63: Can roller (second roller) 70: Upper frame (first frame) 71: Upper rail cam (first rail cam) 77: Upper rail (first rail) 80: Lower frame (second frame) 81: Lower rail cam (second rail cam) 85: Lower rail (second rail) 86: Middle table 87: Support rail cam (4th rail cam) 871: Support roller radial position profile

[0070] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0071] The present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and with various modifications. However, these embodiments are provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. Therefore, the present invention is not limited to the embodiments disclosed below, but should be understood to include all modifications, equivalents, and substitutes included within the technical spirit and scope of the present invention, as well as substitutions or additions of the components of one embodiment with those of another embodiment.

[0072] The attached drawings are merely intended to facilitate understanding of the embodiments disclosed in this specification, and should not be construed as limiting the technical ideas disclosed in this specification, but should be understood to encompass all modifications, equivalents, and substitutes included within the spirit and technical scope of the present invention. In the drawings, the components may be expressed in exaggerated sizes or thicknesses for ease of understanding, but the scope of protection of the present invention should not be construed as being limited thereby.

[0073] The terminology used in this specification is only used to describe specific implementations or examples and is not intended to limit the present invention. In addition, the singular expression includes the plural expression unless the context clearly indicates otherwise. In the specification, terms such as "comprises" and "consists of" are intended to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification. In other words, it should be understood that terms such as "comprises" and "consists of" in the specification do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0074] While terms including ordinal numbers, such as "first" and "second," may be used to describe various components, these components are not limited by these terms. These terms are used solely to distinguish one component from another. Therefore, unless otherwise stated, a "first" component may also be a "second" component.

[0075] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0076] When a component is referred to as being "above" or "below" another component, it should be understood that it is not only positioned directly above that other component, but that there may also be other components present in between.

[0077] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0078] Hereinafter, a rotary can beading device (1) according to an embodiment of the present invention will be described.

[0079] For convenience of explanation, the center of rotation of the rotary (10) is referred to as the central axis (101), and the center of rotation around which the head (37) that orbits the rotary (10) rotates is referred to as the rotation axis (301).

[0080] Referring to FIGS. 1 to 13, the overall structure is described. The rotary can beading device (1) includes a rotary (10) that rotates about a central axis (101).

[0081] The above rotary (10) has an outer rotary (12) and an inner rotary (14) that are concentric, and includes a support rotary (16) provided radially between them. The outer rotary (12) and the inner rotary (14) can rotate at the same rotational speed.

[0082] A lower frame (80) is installed around the lower circumference of the above rotary (10) to support the rotation of the above rotary (10). The above lower frame (80) and the support rotary (16) are maintained in a firmly fixed state so as to support the rotation of the outer rotary (12) and the inner rotary (14).

[0083] A rotary can beading device (1) includes a plurality of arms (20) arranged along the circumference of the rotary (10) and extending radially so as to rotate together with the rotary (10). An embodiment exemplifies that eight arms (20) are installed at equal intervals along the circumference of the outer rotary (12).

[0084] The above arm (20) is provided with a spindle support (21). The spindle support (21) rotatably supports a spindle (30) via a bearing (22). The spindle (30) is rotatably installed on the spindle support (21) about an axis of rotation (301).

[0085] The above spindle (30) includes a cylindrical housing (31) extending vertically, a sleeve (33) inserted into the interior of the housing (31), and a shaft (34) extending vertically and inserted into the sleeve (33).

[0086] The housing (31) and sleeve (33) are fixed as one piece and rotate together. The shaft (34) is rotationally constrained to the sleeve (33) and rotates together with the sleeve (33). The shaft (34) is inserted into the sleeve (33) so as to be able to slide axially. The embodiment exemplifies that the shaft (34) has a substantially regular hexagonal cross-section and a hole of a corresponding shape is formed in the sleeve (33), so that they are mutually rotationally constrained but axially slide freely.

[0087] A head (37) is connected to the lower end of the shaft (34). The head (37) is connected to the shaft (34) so ​​as to rotate together with the shaft (34) and rise and fall together with the shaft (34). The head (37) supports the open end provided at the upper end of the side wall member of the can (2), transmits rotational force to the can (2), and rotates together with the can (2).

[0088] An upper frame (70) is provided on the upper portion of the above rotary (10). The upper frame (70) is installed so as to be maintained in a rigidly fixed state. An upper rail cam (71) having a head height profile extending in the circumferential direction with respect to the central axis (101) of the rotary (10) is installed on the lower portion of the above upper frame (70).

[0089] A shaft support member (24) is installed at the upper end of the shaft (34) to support the shaft (34) so ​​that it can rotate, but restrains the shaft (34) in the axial direction.

[0090] In the above arm (20), a shaft elevation guide (23) is installed to guide and support the elevation of the shaft support member (24). The shaft support member (24) can ascend and descend along the shaft elevation guide (23), and accordingly, the shaft (34) can also ascend and descend together.

[0091] On the upper portion of the shaft support member (24), a head cam follower (35) that ascends and descends together with the shaft (34) of the spindle (30) is installed. The head cam follower (35) revolves around the central axis (101) of the rotary (10) and follows the head height profile, and accordingly, the shaft (34) and the head (37) connected to the lower end of the shaft (34) ascend and descend together.

[0092] At the lower portion of the upper frame (70), an upper rail (77) extending in the circumferential direction with respect to the central axis (101) is further installed. At the upper portion of the shaft support member (24), a head roller (39) is further installed that ascends and descends together with the shaft (34) of the spindle (30) and follows the upper rail (77).

[0093] The upper rail (77) and the upper rail cam (71) are provided at different positions in the radial direction of the central axis (101). In the embodiment, the upper rail (77) is exemplified as being positioned radially inward of the upper rail cam (71).

[0094] Likewise, the head roller (39) and the head cam follower (35) are provided at different positions in the radial direction of the central axis (101). In the embodiment, the head roller (39) is exemplified as being positioned radially inward relative to the head cam follower (35).

[0095] In the head lifting section in the circumferential direction, the height of the head (37) is determined by the upper rail cam (71). And in the head travel section that does not overlap with the head lifting section in the circumferential direction, the height of the head (37) is determined by the upper rail (77).

[0096] For example, in the head lifting section, the head cam follower (35) contacts the upper rail cam (71) and reflects the head height profile to the height of the head (37), and in the head traveling section, the head roller (39) contacts the upper rail (77) and maintains the height of the head (37) constant.

[0097] The above rotary can beading device (1) includes a plurality of can tables (60) arranged along the circumference of the rotary (10) and extending radially so as to rotate together with the rotary (10). In the embodiment, eight can tables (60) are installed at equal intervals along the circumferential direction on the outer rotary (12).

[0098] A table lifting guide (121) extending vertically is provided on the outer periphery of the outer rotary (12), and the eight can tables (60) are each guided to be lifted along the table lifting guide (121).

[0099] On the radially outer side of the can table (60), a can holder (61) is installed on the can table (60) so as to rotate about the central axis (101) together with the can table (60).

[0100] The can holder (61) is aligned with the head (37) in the vertical direction. In addition, the can holder (61) is installed to freely rotate with respect to the can table (60) about the rotation axis (301) of the head (37). The can holder (61) rotates in response to the rotational force of the head (37).

[0101] A lower rail cam (81) is installed in the lower frame (80). The lower rail cam (81) has a can height profile extending in the circumferential direction with respect to the central axis (101) of the rotary (10).

[0102] At the bottom of the can table (60), a can cam follower (62) that rises and falls together with the can table (60) is installed. The can cam follower (62) revolves around the central axis (101) of the rotary (10) and follows the can height profile, thereby causing the can table (60) to rise and fall together, thereby adjusting the height of the can support (61).

[0103] On the above lower frame (80), a lower rail (85) extending in the circumferential direction with respect to the central axis (101) is further installed. In addition, on the lower portion of the can table (60), a can roller (63) that rises and falls together with the can table (60) and follows the lower rail (85) is further installed.

[0104] The lower rail (85) and the lower rail cam (81) are provided at different positions in the radial direction of the central axis (101). In the embodiment, the lower rail (85) is exemplified as being positioned radially inward of the lower rail cam (81).

[0105] Likewise, the can roller (63) and the can cam follower (62) are provided at different positions in the radial direction of the central axis (101). In the embodiment, the can roller (63) is exemplified as being positioned radially inward relative to the can cam follower (62).

[0106] In the can lifting section in the circumferential direction, the height of the can table (60) can be determined by the lower rail cam (81). And in the can traveling section that does not overlap with the can lifting section in the circumferential direction, the height of the can table (60) is determined by the upper rail (77).

[0107] For example, in the can lifting section, the can cam follower (62) contacts the lower rail cam (81) and reflects the can height profile to the height of the can support (61), and in the can traveling section, the can roller (63) contacts the lower rail (85) and maintains the height of the can support (61) constant.

[0108] The above rotary can beading device (1) includes a beading knife (40) installed on each of the arms (20).

[0109] The above beading knife (40) is rotatably supported by a knife support shaft (42) installed on a knife support (41). The above beading knife (40) is extrapolated to the knife support shaft (42) so that relative movement in the axial direction with respect to the knife support shaft (42) is restricted, but relative rotation is permitted.

[0110] The arm (20) supports the knife support (41) so that the knife support (41) can move toward or away from the rotation axis (301) of the head (37). In the embodiment, a knife movement guide (25) is provided on the arm (20) to support the knife support (41) so that the knife support (41) can slide in the radial direction of the rotation axis (301). The knife movement guide (25) is provided on the arm (20) inward of the spindle support (21) in the radial direction of the central axis (101).

[0111] On the upper portion of the above support rotary (16), a knife rail cam (17) having a knife radial position profile (172) extending circumferentially with respect to the central axis (101) is installed. For example, the knife radial position profile (172) may have a circular trajectory eccentrically arranged with respect to the central axis (101).

[0112] The above knife movement guide (25) is provided on the arm (20) outside the knife rail cam (17) in the radial direction of the central axis (101).

[0113] A knife cam follower (43) is installed on the knife support (41) to move radially with the beading knife (40) about the rotation axis (301) and to follow the knife radial position profile (172) to adjust the radial distance of the beading knife (40) with respect to the rotation axis (301) of the spindle (30).

[0114] The above rotary can beading device (1) is positioned opposite the beading knife (40) with the rotation axis (301) in between and includes support rollers (50) each installed on the arm (20).

[0115] The above support roller (50) is rotatably supported by a roller support shaft (52) installed on a roller support (51). The support roller (50) is extrapolated to the roller support shaft (52) so that relative movement in the axial direction with respect to the roller support shaft (52) is restricted, but relative rotation is permitted.

[0116] The arm (20) supports the roller support (51) so that the roller support (51) can move toward or away from the rotation axis (301) of the head (37). In the embodiment, a roller movement guide (26) is provided on the arm (20) to support the roller support (51) so that the roller support (51) can slide in the radial direction of the rotation axis (301). The roller movement guide (26) is provided on the arm (20) on the outer side of the spindle support (21) in the radial direction of the central axis (101). For reference, the shaft elevation guide (23) is provided between the spindle support (21) and the roller movement guide (26) in the radial direction.

[0117] The lower frame (80) is provided with a middle table (86) that extends radially outward from the head (37) with respect to the central axis (101) to a height corresponding to the head (37).

[0118] A support rail cam (87) having a support roller radial position profile (871) extending circumferentially about the central axis (101) is installed on the above middle table (86). For example, the support roller radial position profile (871) may have an arc trajectory that is eccentrically arranged about the central axis (101).

[0119] The above roller movement guide (26) is provided on the arm (20) in the radial direction of the central axis (101) and inward from the support rail cam (87).

[0120] In the above roller support (51), a support cam follower (53) is installed that moves radially with the support roller (50) about the rotation axis (301) and follows the support roller radial position profile (871) to adjust the radial distance of the support roller (50) with respect to the rotation axis (301) of the spindle (30).

[0121] The above rotary can beading device (1) includes a plurality of spindle drive supports (141) arranged along the circumference of the rotary (10) and extending radially so as to rotate together with the rotary (10). In the embodiment, eight spindle drive supports (141) are installed at equal intervals along the circumferential direction on the inner rotary (14). The spindle drive supports (141) are aligned with the arm (20) in the radial direction of the central axis (101).

[0122] A spindle drive unit (143) is installed on the above spindle drive support (141). The spindle drive unit (143) is positioned radially further inward of the central axis (101) than the spindle (30).

[0123] The spindle drive unit (143) includes a drive motor (145) that generates rotational force and a drive gear (147) that rotates by the drive motor (145). The rotational axis of the drive gear (147) is arranged parallel to the rotational axis of the spindle (30). A driven gear (32) that rotates integrally with the housing (31) and meshes with the drive gear (147) is provided on the upper portion of the housing (31) of the spindle (30). The spindle drive unit (143) rotates the spindle (30) in a section where rotation of the spindle (30) is required in the circumferential direction of the rotary (10).

[0124] The above spindle (30) includes a case (300) that is fixedly installed on the spindle support (21). The case (300) has a cylindrical structure and is provided with a first hollow portion (302) that is open upward. The first hollow portion (302) has a shape that extends in the axial direction.

[0125] Referring to FIGS. 12 to 17, the housing (31) is accommodated in the first hollow portion (302) so as to be rotatable relative to the case (300). The outer diameter of the housing (31) is smaller than the inner diameter of the case (300). The housing (31) has a second hollow portion (310) extending in the axial direction.

[0126] The above sleeve (33) is press-fitted into the second hollow portion (310) of the housing (31) and becomes an integral part thereof. That is, the housing (31) and the sleeve (33) are mutually restrained in the axial direction and also in the circumferential direction. A pair of the sleeves (33) are respectively arranged at the upper and lower portions of the second hollow portion (310).

[0127] The above shaft (34) is installed so as to be rotationally constrained to the sleeve (33) but axially slidable relative to the sleeve (33). Accordingly, the shaft (34) extends axially across the second hollow portion (310) so as to be rotationally constrained relative to the housing (31) but axially slidable relative to the housing (31).

[0128] Between the case (300) and the housing (31), a bearing (22) is interposed to support the rotation of the housing (31) with respect to the case (300).

[0129] The above bearing (22) is accommodated in the first hollow part (302).

[0130] The above bearing (22) is positioned radially between the case (300) and the housing (31).

[0131] The bearing (22) may be accommodated in the first hollow portion (302) with the radially outer side in contact with the inner circumference of the case (300) and the radially inner side in contact with the outer circumference of the housing (31).

[0132] The above bearings (22) are provided in multiple numbers so as to be spaced apart from each other in the axial direction. In the embodiment, three bearings (22) are spaced apart from each other.

[0133] A pair of sleeves (33) are inserted into one axial end and the other axial end of the second hollow portion (310) of the housing (31). The lower end of the sleeve (33) positioned at the bottom is positioned to be in contact with the bottom of the housing (31), and the upper end of the sleeve (33) positioned at the top corresponds to the upper end of the housing (31), or may protrude further upward than the upper end of the housing as in the embodiment.

[0134] Then, since a pair of sleeves (33) are respectively positioned as far apart as possible from the housing (31) of the second hollow section (310) in the axial direction on both sides, the maximum axial distance of the support point of the sleeve (33) with respect to the shaft (34) can be secured.

[0135] A pair of the above sleeves (33) are spaced apart from each other in the axial direction. Then, the shaft (34) is exposed through the space of the second hollow portion (310) between the pair of the above sleeves (33).

[0136] When relative axial movement occurs between a sleeve (33) and a shaft (34) that rotate at high speed, frictional heat is generated between the sleeve (33) and the shaft (34). This frictional heat increases approximately in proportion to the contact area between the two.

[0137] By positioning the two sleeves (33) at a distance from each other as in the example, the frictional area between the sleeve and the shaft can be reduced, thereby reducing the generation of frictional heat. In addition, in the section where the shaft (34) is exposed, the shaft (34) can directly dissipate heat in the radial direction without passing through the sleeve.

[0138] The distance (G) between the axial inner ends of a pair of the sleeves (33) is set to be 1 / 6 or more and 1 / 3 or less of the distance (D) between the axial outer ends of a pair of the sleeves. If the ratio is 1 / 6 or less, the effect of the sleeve supporting the bending deformation of the shaft is hardly increased, while the cooling efficiency of the shaft is reduced. If the ratio is 1 / 3 or more, the cooling efficiency of the shaft is hardly increased, while the effect of the sleeve supporting the bending deformation of the shaft is reduced.

[0139] The ratio (L1 / L2) of the axial lengths of each of the pair of sleeves (33) may be 0.9 to 1.1. That is, the axial length of one sleeve (33) may be set to be no longer or shorter than the axial length of the other sleeve (33) by more than 10%. Accordingly, it is possible to prevent a large bending moment from occurring in the long and thin sleeve (33).

[0140] Considering that it is connected to the head (37) at the bottom, the axial length (L2) of the sleeve (33) installed at the bottom among the pair of sleeves (33) can be set to be equal to or greater than the axial length (L1) of the sleeve (33) installed at the top.

[0141] The above distance (G) may be 1.0 to 2.0 times the average diameter (d) of the shaft (34). The average diameter of the shaft means the diameter of a circle having an area substantially equal to the area of ​​the cross-section of the inner region defined by the outer circumferential surface of the shaft.

[0142] When the above magnification is less than 1.0, the cooling efficiency of the shaft is reduced while the effect of the sleeve supporting the bending deformation of the shaft is hardly increased, and when the above magnification is more than 2.0, the cooling efficiency of the shaft is hardly increased while the effect of the sleeve supporting the bending deformation of the shaft is reduced.

[0143] In this way, the embodiment suppresses vibration of the sleeve (33) rotating at high speed and reduces heat generation while improving the cooling effect of the shaft (34) by minimizing bending deformation or bending moment by axially arranging a pair of sleeves (33).

[0144] Meanwhile, the axial section (L1, L2) in which each of the sleeves (33) comes into contact with the inner circumference of the housing (31) overlaps at least partially with the axial section (B) in which the bearing (22) comes into contact with the outer circumference of the housing.

[0145] Then, the sleeve (33) is reliably supported by the bearing (22) so as not to be radially eccentric, thereby preventing vibration of the sleeve (33) rotating at high speed.

[0146] At least a portion of the axial section (B) in which each of the above bearings (22) comes into contact with the outer periphery of the housing (31) may be arranged outside the axial section (G) between the pair of sleeves (33).

[0147] If the axial section (B) where the bearing (22) is in contact with the outer periphery of the housing (31) is placed entirely within the axial section (G) between the pair of sleeves (33), there is a risk that the housing (31) may be deformed in that section, and therefore it is necessary to increase the rigidity of the housing (31). This may cause an increase in the volume and mass of the rotating body, thereby increasing the amount of heat generated.

[0148] However, if the embodiment and each bearing (22) are arranged so that at least a part of the axial section (B) in contact with the housing (31) is placed outside the section (G), it is possible to form the side wall of the housing (31) thin.

[0149] Additionally, at least a portion of the above section (G) does not overlap with the section (B) where the bearing is in contact with the outer periphery of the housing.

[0150] Then, the second hollow portion (310) inside the housing (31) faces the first hollow portion (302) of the case (300) with the side wall of the housing (31) interposed therebetween in the radial direction. Accordingly, the heat emitted by the shaft (34) in the space (G) between the pair of sleeves can be discharged to the outside of the housing through the side wall of the housing.

[0151] Meanwhile, the case (300) is provided with one or more through holes (307). The through holes (307) serve as passages connecting the first hollow portion (302) inside the case (300) to the outside of the case (300). In the embodiment, the through holes (307) are provided in the upper and lower sides of the side walls of the case (300), respectively. The through holes (307) are provided in the case (300) between two axially adjacent bearings (22).

[0152] Suction may be performed to discharge air from the first hollow portion (302) to the outside through the above-mentioned through-hole (307), or blowing may be performed to introduce external air into the first hollow portion (302). If there are two or more through-holes (307), suction may be performed in some, and blowing may be performed in some.

[0153] When the air of the first hollow part (302) is suctioned to the outside through the above-mentioned through-hole (307), the high-temperature air of the first hollow part (302) is suctioned out, air flow occurs in the internal gap of the spindle (30), and low-temperature air flows into the spindle (30) to be filled again in the first hollow part (302).

[0154] When external air is introduced into the first hollow portion (302) through the above-mentioned through-hole (307), air flow occurs in the internal gap of the spindle (30) and high-temperature air can be quickly discharged to the outside.

[0155] Meanwhile, the shaft (34) has a hollow structure. That is, the shaft (34) has an axial hole (341) extending axially from the center. The axial hole (341) penetrates the shaft (34) in the axial direction. By arranging the axial hole (341) in a thin and long manner at the center of the shaft (34), a cooling passage can be secured without substantially reducing the bending rigidity of the shaft (34).

[0156] By forcing gas through the above shaft hole (341), the shaft (34) can be directly and quickly cooled.

[0157] The forced flow structure of the above gas can be implemented in a shaft support member (24) that rotatably supports the upper end of the shaft (34).

[0158] To this end, the shaft support member (24) has a chamber (242) in which the upper end of the shaft (34) is exposed. The upper end of the shaft hole (341) is exposed to communicate with the chamber (242).

[0159] And, to communicate with the chamber (242), a suction hole (243) is installed in the shaft support member (24). When the gas in the chamber (242) is suctioned to the outside or external air is supplied to the chamber (242) through the suction hole, the supplied air flows axially along the shaft hole (341) and cools the shaft (34).

[0160] Although the present invention has been described with reference to the drawings exemplified above, it is to be understood that the present invention is not limited to the embodiments and drawings disclosed herein, and that various modifications may be made by those skilled in the art within the scope of the technical idea of ​​the present invention. Furthermore, even if the operational effects according to the configuration of the present invention have not been explicitly described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be acknowledged.

Claims

1. A rotary rotating about a central axis; A plurality of arms arranged along the circumference of the rotary and extending radially so as to rotate with the rotary; A spindle installed in each of the above arms so as to be rotatable about an axis of rotation; and It includes a head that rotates by receiving the rotational force of the spindle; The above spindle: A case having a first hollow portion extending axially; A housing having a second hollow portion that is received in the first hollow portion so as to be rotatable with respect to the case and extends axially and has a diameter smaller than that of the case; A shaft extending axially across the second hollow portion so as to be axially slidable relative to the housing, the shaft having an axial end connected to the head; and It includes a pair of sleeves, which are inserted into one end and the other end of the axial direction of the second hollow section, respectively, and are connected to the housing so as to be rotationally restrained; A rotary can beading device, wherein the shaft is inserted into a pair of sleeves so as to be axially slidable but mutually rotationally constrained.

2. A rotary can beading device according to claim 1, wherein the pair of sleeves are spaced apart from each other in the axial direction.

3. A rotary can beading device according to claim 1, wherein the distance between the axial inner ends of a pair of said sleeves is 1 / 6 or more and 1 / 3 or less of the distance between the axial outer ends of a pair of said sleeves.

4. A rotary can beading device according to claim 1, wherein the ratio of the axial lengths of each of the pair of sleeves is 0.9 to 1.

1.

5. A rotary can beading device according to claim 1, wherein the distance between the axial inner ends of a pair of sleeves is 1.0 to 2.0 times the average diameter of the shaft.

6. In claim 1, further comprising a bearing interposed between the case and the housing to support rotation of the housing with respect to the case; The above bearing is in contact with the outer periphery of the housing, The above bearings are arranged radially between the case and the housing, but are provided in multiple numbers so as to be spaced apart from each other in the axial direction. A rotary can beading device, wherein each of the sleeves has an axial section in contact with the inner periphery of the housing that at least partially overlaps with an axial section in which the bearings have contact with the outer periphery of the housing.

7. A rotary can beading device according to claim 6, wherein at least a portion of an axial section of each of the bearings in contact with the outer periphery of the housing is positioned outside the axial section between the pair of sleeves.

8. A rotary can beading device according to claim 6, wherein at least a portion of an axial section between a pair of sleeves does not overlap a section where the bearing contacts the outer periphery of the housing.

9. In claim 6, the case is provided with a through hole formed to communicate with a space provided outside the housing in the first hollow section, The above through hole is provided in the case between two axially adjacent bearings, A rotary can beading device that causes forced flow between the gas of the first hollow section and the gas outside the case through the through hole.

10. In claim 1, an axial hole is provided at the center of the shaft and extends through the shaft along the axial direction. A rotary can beading device in which gas is forced to flow axially through the above-mentioned axial hole.

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