Rotary can beading apparatus

Abstract

Provided is a rotary-type can beading apparatus enabling the smooth cooling of a spindle shaft rotating at a high speed, thereby enabling the prevention of a processing error due to the thermal expansion of the shaft. A spindle of the rotary can beading apparatus comprises: a case provided with a first hollow portion extending in an axial direction; a housing received in the first hollow portion so as to be rotatable with respect to the case, and provided with a second hollow portion having a diameter smaller than that of the case and extending in the axial direction; and a shaft rotationally constrained with the housing while extending in the axial direction so as to be slidable in the axial direction with respect to the housing. The housing has installed thereon a plurality of fan blades protruding radially outward from an outer circumferential surface and extending in the vertical direction, and arranged so as to be spaced apart along the circumferential direction.

Description

Rotary can beading device

[0001] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0012512, dated January 26, 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 type can beading device that can prevent processing errors due to thermal expansion of a spindle shaft rotating at high speed by facilitating cooling of the spindle 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] Accordingly, a structure is required that can minimize the thermal expansion of the spindle shaft even under high load and long-term use environments.

[0007] The present invention has been devised to solve the above-described problem, and aims to provide a rotary beading device capable of minimizing dimensional deviation of a processed product caused by thermal expansion of a spindle shaft in a rotary beading molding process.

[0008] 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.

[0009] 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.

[0010] 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 relative 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] The height of the head in the first section in the circumferential direction can be determined by the first rail cam.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] A spindle may be installed in each of the above arms so as to be rotatable around the above axis.

[0019] The spindle includes a case having a first hollow portion extending axially. The case can be fixed to the arm.

[0020] 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.

[0021] 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.

[0022] The above head rotates by receiving the rotational force of the spindle and can move axially by the shaft.

[0023] Between the case and the housing, a bearing may be interposed to support rotation of the housing relative to the case.

[0024] The above bearing can be arranged radially between the case and the housing.

[0025] 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.

[0026] The above bearings may be provided in multiple numbers so as to be spaced apart from each other in the axial direction.

[0027] The present invention provides, as an embodiment for solving the above-described problem, a plurality of fan blades that protrude radially outward from the outer surface of the housing, extend in the vertical direction, and are spaced apart along the circumferential direction.

[0028] The above fan blade is placed in the first hollow portion while the housing is accommodated in the case.

[0029] The surface of the above fan blade may have a normal line in the circumferential direction.

[0030] The above fan blades can be arranged between two axially adjacent bearings.

[0031] The present invention is an implementation example for solving the above-described problem, and provides a cooling structure in which a through hole is provided in the case so as to communicate with a space provided outside the housing in the first hollow portion, and gas in the first hollow portion is suctioned to the outside or external air is supplied to the first hollow portion through the through hole.

[0032] The above through hole may be provided in the case between two axially adjacent bearings.

[0033] The present invention is an embodiment for solving the above-described problem, and provides a structure in which an axial hole extending from the center of the shaft in an axial direction penetrates the shaft in the axial direction, and a gas is forced to flow through the axial hole.

[0034] The forced flow structure of the above gas can be implemented by providing a chamber in which the shaft hole is connected to a shaft support member that rotatably supports the axial second end of the shaft, and providing a suction hole in the shaft support member so as to communicate with the chamber.

[0035] Through the above suction hole, the gas in the chamber can be suctioned to the outside or external air can be supplied to the chamber.

[0036] The present invention provides a temperature sensor capable of measuring the temperature of the shaft as an embodiment for solving the above-described problem.

[0037] The above temperature sensor can be installed in a space provided outside the housing in the first hollow section.

[0038] The above cooling control can be performed based on the temperature measured by the temperature sensor.

[0039] If the temperature measured by the above temperature sensor is higher than the reference temperature, control can be performed to further strengthen the cooling of the shaft.

[0040] Two or more of the above implementation examples can be optionally combined.

[0041] For example, the fan blade may be installed in the housing, and a through hole may be provided in the case to communicate with the space in which the fan blade is placed in the first hollow portion.

[0042] For example, if the temperature measured by the temperature sensor is higher than the existing temperature, the suction or supply pressure applied to the suction hole can be increased.

[0043] For example, if the temperature measured by the temperature sensor is higher than the existing temperature, the suction or supply pressure passing through the through hole can be increased.

[0044] According to the present invention, the phenomenon of thermal expansion of the spindle shaft of a rotary can beading device can be suppressed, thereby minimizing processing quality deviation and improving quality.

[0045] 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.

[0046] Figures 1 and 2 are a top perspective view and a front view of the rotary can beading device of the embodiment.

[0047] Figure 3 is a top perspective view of Figure 1 with the upper frame omitted.

[0048] Fig. 4 is a bottom perspective view of the upper frame of the rotary can beading device of Fig. 1.

[0049] Figure 5 is a bottom perspective view of Figure 1 with the lower frame omitted.

[0050] Fig. 6 is a top perspective view of the lower frame of the rotary can beading device of Fig. 1.

[0051] Fig. 7 is a top perspective view of the lower frame and the rotary of the rotary can beading device of Fig. 1.

[0052] Figure 8 is a front cross-sectional view of the upper frame, lower frame, and rotary.

[0053] Figure 9 is a front cross-sectional view showing a state in which a can is supplied to a rotary can beading device.

[0054] Figure 10 is a front cross-sectional view showing a state in which a can is beaded in a rotary can beading device.

[0055] 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.

[0056] Figure 12 is a cross-sectional perspective view of the spindle.

[0057] Fig. 13 is a cross-sectional perspective view showing the shaft of the spindle of Fig. 12 omitted.

[0058] Figure 14 is an exploded perspective view of the spindle.

[0059] Figure 15 is a side cross-sectional view of the spindle.

[0060] Figures 16 and 17 are a cross-sectional perspective view and a perspective view of the state in which the shaft support member and head are installed on the upper and lower parts of the spindle, respectively.

[0061] Fig. 18 is an enlarged cross-sectional view of a specific portion of the shaft support member of Fig. 16.

[0062] [Explanation of symbols]

[0063] 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: Driving motor 147: Driving 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 313: Fan blade 32: Driven gear 33: Sleeve 34: Shaft 341: Shaft hole 35: Head cam follower (first cam follower) 37: Head 38: Temperature sensor 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 (fourth rail cam) 871: Support roller radial position profile

[0064] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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 intervening there.

[0071] 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.

[0072] Hereinafter, a rotary can beading device (1) according to an embodiment of the present invention will be described.

[0073] 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).

[0074] 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).

[0075] 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.

[0076] 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).

[0077] 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).

[0078] 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).

[0079] 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).

[0080] 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.

[0081] 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).

[0082] 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).

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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).

[0087] 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).

[0088] 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).

[0089] 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).

[0090] 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.

[0091] 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).

[0092] 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).

[0093] 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).

[0094] 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).

[0095] 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).

[0096] 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).

[0097] 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.

[0098] 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).

[0099] 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).

[0100] 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).

[0101] 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.

[0102] The above rotary can beading device (1) includes a beading knife (40) installed on each of the arms (20).

[0103] 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.

[0104] 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).

[0105] 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).

[0106] 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).

[0107] 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).

[0108] 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).

[0109] 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.

[0110] 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.

[0111] 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).

[0112] 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).

[0113] 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).

[0114] 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).

[0115] 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).

[0116] 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).

[0117] 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).

[0118] 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.

[0119] Referring to FIGS. 12 to 18, 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.

[0120] 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).

[0121] 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).

[0122] 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).

[0123] The above bearing (22) is accommodated in the first hollow part (302).

[0124] The above bearing (22) is positioned radially between the case (300) and the housing (31).

[0125] 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).

[0126] 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.

[0127] A fan blade (313) is installed on the outer surface of the housing (31). A plurality of fan blades (313) are spaced apart from each other along the circumference of the housing (31).

[0128] The fan blade (313) protrudes radially outward from the outer surface of the housing (31) and extends in an up-and-down direction. Accordingly, the surface of the fan blade (313) may have a normal line facing the circumferential direction.

[0129] The above fan blade (313) is placed in the first hollow portion (302) while the housing (31) is accommodated in the case (300).

[0130] The fan blade (313) is arranged between two axially adjacent bearings. In the embodiment, the fan blade (313) is arranged between three bearings, and is arranged in an annular shape at the upper and lower ends, respectively.

[0131] When the housing (31) rotates relative to the case (300), the fan blade (313) rotates in the annular space between the housing (31) and the case (300), generating a large airflow, and the resulting airflow quickly absorbs heat from the surface of the housing (31). Accordingly, airflow occurs in the internal gap of the spindle (30), and high-temperature air can be quickly discharged to the outside.

[0132] 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).

[0133] The lower through hole (307) communicates with the space where the fan blades (313) provided at the lower part are installed, and the upper through hole (307) communicates with the space where the fan blades (313) provided at the upper part are installed.

[0134] 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.

[0135] 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).

[0136] 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.

[0137] 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.

[0138] By forcing gas through the above shaft hole (341), the shaft (34) can be directly and quickly cooled.

[0139] 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).

[0140] 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).

[0141] 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).

[0142] The cooling operation using the forced flow as described above can be controlled by measuring the temperature of the shaft (34) with a temperature sensor (38).

[0143] The temperature sensor (38) may be installed in a space provided outside the housing in the first hollow portion (302). The temperature sensor (38) monitors the temperature of the shaft (34). In addition, the cooling control is performed based on the temperature measured by the temperature sensor (38). For example, when the temperature measured by the temperature sensor is higher than the reference temperature, control may be performed to further strengthen the cooling operation of the shaft (34).

[0144] For example, if the temperature measured by the temperature sensor (38) is higher than the existing temperature, the suction or supply pressure applied to the suction hole (243) can be increased, and the suction or supply pressure passing through the through hole (307) can be increased.

[0145] Accordingly, cooling of the shaft (34) can be performed efficiently and reliably.

[0146] 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 that rotates 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 to be rotatable about an axis of rotation of each of the above arms; 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 rotatably constrained with the housing but capable of sliding axially with respect to the housing, the shaft having an axial end connected to the head; and It includes a plurality of fan blades that protrude radially outward from the outer surface of the housing, extend in the vertical direction, and are spaced apart along the circumferential direction; A rotary can beading device in which the fan blade is placed in the first hollow portion while the housing is accommodated in the case.

2. A rotary can beading device according to claim 1, wherein the surface of the fan blade has a normal line in the circumferential direction.

3. 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 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. The above fan blade is a rotary can beading device arranged between two axially adjacent bearings.

4. A rotary can beading device according to claim 1, wherein the case has a through hole that communicates with the space in which the fan blade is arranged in the first hollow section.

5. A rotary can beading device according to claim 4, wherein the gas of the first hollow portion is suctioned to the outside through the through hole.

6. Rotary rotating about the 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 to be rotatable about an axis of rotation of each of the above arms; 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 rotatably constrained with the housing but capable of sliding axially with respect to the housing, the shaft having an axial end connected to the head; and Including a through hole provided in the case so as to communicate with a space provided outside the housing in the first hollow section; A rotary can beading device in which the gas of the first hollow portion is suctioned to the outside through the above-mentioned through-hole.

7. In claim 6, further comprising a bearing interposed between the case and the housing to support rotation of the housing with respect to the case; The above bearings are provided in multiple numbers so as to be arranged radially between the case and the housing but spaced apart from each other in the axial direction. The above through hole is a rotary can beading device provided in the case between two axially adjacent bearings.

8. A rotary can beading device according to claim 6, further comprising a temperature sensor installed in a space provided outside the housing in the first hollow section.

9. A rotary can beading device according to claim 8, which increases suction pressure when the internal temperature measured by the temperature sensor is higher than the upper limit reference temperature.

10. In claim 6, an axial hole extending axially from the center of the shaft; and A rotary can beading device comprising a forced flow unit that forces cooling gas to flow through the above shaft hole.

11. 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 to be rotatable about an axis of rotation of each of the above arms; 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 rotatably constrained with the housing but capable of sliding axially with respect to the housing, and having an axial first end connected to the head; an axial hole extending axially from the center of the above shaft; and A rotary can beading device comprising a forced flow unit that forces gas to flow through the above shaft hole.

12. In claim 11, the forced flow part: A shaft support member that rotatably supports the axial second end of the shaft and has a chamber through which the shaft hole communicates; and A rotary can beading device, comprising a suction hole provided in the shaft support member so as to communicate with the chamber.

13. In claim 12, a temperature sensor is further included, installed in a space provided outside the housing in the first hollow section; A rotary can beading device that increases suction pressure through the suction hole when the internal temperature measured by the above temperature sensor is higher than the upper limit reference temperature.

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