Turn buckle structure facilitating face shell replacement, and lacing device comprising same

Abstract

Disclosed in the present invention are a turn buckle structure facilitating face shell replacement and a lacing device comprising same. The turn buckle structure facilitating face shell replacement comprises an inner turn buckle and a face shell; the face shell is detachably mounted and arranged on the outer side of the inner turn buckle, and the face shell is provided with a fastening block; the inner turn buckle is provided with a separating-fastening structure, the fastening block being fitted to the separating-fastening structure to realize the fastening and separation between the inner turn buckle and the face shell. The separating-fastening structure comprises a snap-fit portion and a separation recess, and the fastening block and the snap-fit portion are in a snap-fit connection, such that the face shell and the inner turn buckle are in a linkable connection. The face shell can also rotate relative to the inner turn buckle to rotate the fastening block to the separation recess, and separate the face shell from the inner turn buckle by means of the separation recess, thereby meeting the requirement of a user for quickly replacing the face shell.

Description

A screw cap structure facilitating replacement of a surface shell and a lacing device comprising the same

[0001] The present application claims priority to Chinese Patent Application No. 202422298859.7, filed on September 20, 2024, to Chinese Patent Application No. 202411574034.1, filed on November 6, 2024, to Chinese Patent Application No. 202510086465.1, filed on January 17, 2025, to Chinese Patent Application No. 202510879928.X, filed on June 26, 2025, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of lacing devices, and in particular to a screw cap structure facilitating replacement of a surface shell and a lacing device comprising the same. BACKGROUND

[0003] Currently, tightening of footwear, clothing, hats or other articles often employs lacing, ropes or other tensioning members. The lacing device in the prior art can meet the functional requirements of tightening the lacing to tighten the footwear, clothing, hats or other articles, but its appearance is single and cannot be changed.

[0004] In order to make the appearance of the lacing mechanism more beautiful, a decorative surface shell is usually sleeved outside the screw cap of the lacing device, which makes the whole lacing mechanism more beautiful. The connection mode of the screw cap of the lacing device and the decorative surface shell usually has three modes of buckle connection, magnetic attraction connection or adhesive type fixed connection. The adhesive type fixed connection makes the decorative surface shell and the lacing device not detachable, so the decorative surface shell cannot be replaced. The magnetic connection mode will cause the problem of falling off of the decorative surface shell due to too small magnetic attraction force during use. Although the ordinary buckle connection has the advantage of being detachable, it often needs to use tools to pry the decorative surface shell when detaching, improper operation will cause damage to the decorative surface shell and the screw cap, and the operation requires certain skills, so the replacement of the decorative surface shell is difficult for the user of the lacing device.

[0005] Therefore, there is an urgent need for a lacing device which can replace the decorative surface shell more conveniently and quickly. SUMMARY

[0006] The present application aims to at least solve one of the technical problems in the related art. To this end, one object of the present application is to provide a screw cap structure facilitating replacement of a face shell, comprising an inner screw cap and a face shell, the face shell being detachably mounted on the outer side of the inner screw cap, the face shell being provided with a clamping block, the inner screw cap being provided with a split structure, the clamping block and the split structure cooperating to realize clamping and separation of the inner screw cap and the face shell.

[0007] The split structure comprises a clamping portion and a separation groove, the clamping block and the clamping portion being clamped to linkably connect the face shell and the inner screw cap; the face shell can also rotate relative to the inner screw cap to rotate the clamping block to the separation groove and separate the face shell and the inner screw cap through the separation groove.

[0008] The provision of the separation groove enables the separation of the face shell and the inner screw cap without the aid of tools.

[0009] The linkable connection means that the movement or change of the face shell can cause the corresponding movement or change of the inner screw cap. The movement of the face shell may synchronously cause the movement of the inner screw cap, or the inner screw cap may start to move synchronously after a period of movement of the face shell. Therefore, the linkable connection means that the face shell and the inner screw cap can be linked in a certain stroke, allowing the face shell to have a certain period of free movement. The linkable connection includes axial linkage and / or circumferential linkage, and the circumferential linkage allows the face shell to be linked in different ways relative to the inner screw cap in the clockwise direction or the counterclockwise direction, or only in one direction of the circumference and not in the opposite direction. The "circumferential direction" in the present application refers to the circumferential direction.

[0010] Preferably, the clamping portion is a mechanical structure such as a snap-fit clamping groove, a through hole, a protrusion, etc. that can form a clamping connection relationship with the clamping block.

[0011] More preferably, the clamping portion is configured as a snap-fit clamping groove, which can be a groove or a through groove.

[0012] Further, the separation groove and the clamping portion are offset by a certain angle along the circumferential direction of the inner screw cap, and the offset angle ranges from 5° to 180°.

[0013] Further preferably, the offset angle ranges from 10° to 120°.

[0014] Further, the separation groove comprises a first side wall and an opposite second side wall adjacent to the clamping portion, wherein the first side wall and the second side wall each have a proximal end adjacent to the proximal end of the inner rotary cover and an opposite distal end, the distal end of the second side wall is configured to be inclined towards a side away from the clamping portion compared to the proximal end thereof, and / or the distal end of the first side wall is configured to be inclined towards a side close to the clamping portion compared to the proximal end thereof, so as to guide the clamping block to smoothly slide out.

[0015] Further, the split-and-combine structure further comprises a rotary transition portion arranged between the clamping portion and the separation groove, for guiding the clamping block to rotate and transition to the position of the separation groove.

[0016] Further, the rotary transition portion comprises a transition surface adjacent to a side of the clamping portion close to the separation groove, the transition surface being used for guiding the clamping block to leave the clamping portion when the face shell and the inner rotary cover are rotated and separated.

[0017] Preferably, the transition surface is a flat surface or a curved surface.

[0018] Further preferably, the transition surface is an arc surface. That is, the rotary transition portion comprises a transition arc surface adjacent to a side of the clamping portion close to the separation groove, the transition arc surface being used for guiding the clamping block to leave the clamping portion when the face shell and the inner rotary cover are rotated and separated.

[0019] Further, the rotary transition portion further comprises a rotary guide portion arranged between the separation groove and the transition surface, a rotary transition step being formed between the rotary guide portion and the outer side of the inner rotary cover. The rotary transition step is used for rotationally supporting the clamping block during rotation of the clamping block to the position of the separation groove.

[0020] Further, the split-and-combine structure further comprises an assembly groove located at an alignment position of the clamping portion on the outer side of the inner rotary cover. When assembling the face shell and the inner rotary cover, if the face shell is buckled from the alignment position of the clamping portion, the assembly groove is used for guiding the clamping block to the position of the clamping portion.

[0021] Further, the depth of the separation groove gradually decreases from the top end to the bottom end of the separation groove, or the depth of the separation groove gradually decreases from the middle portion to the bottom end of the separation groove.

[0022] The depth of the assembly groove gradually increases from the clamping portion to the bottom end of the inner rotary cover.

[0023] The middle part of the separation groove in the present application refers to any position between the bottom end and the top end of the separation groove, and does not require being exactly at the position of half the height of the separation groove. The position of the middle part of the separation groove can be determined according to actual conditions.

[0024] The top end of the separation groove can be flush with the top end of the inner rotary cover, or can be located in the middle part of the inner rotary cover. Similarly, the top end of the clamping part can be flush with the top end of the inner rotary cover, or can be located in the middle part of the inner rotary cover. In the present application, the top end and the bottom end of the separation groove are consistent with the top end and the bottom end of the inner rotary cover.

[0025] Further, at least a part of the bottom surface of the separation groove is configured as a first inclined surface, and at least a part of the bottom surface of the assembly groove is configured as a second inclined surface. The bottom surface of the separation groove and the assembly groove refers to the groove bottom.

[0026] Further preferably, the inclination directions of the first inclined surface and the second inclined surface are opposite. The "inclination directions are opposite" means that the first inclined surface and the second inclined surface extend in opposite directions from the bottom end to the top end of the inner rotary cover, one is radially outwardly expanded, and the other is radially inwardly contracted. The difference lies in that the separation groove serves as a lead-out surface, and the assembly groove serves as a lead-in surface. Since the lead-in and lead-out directions are opposite, the inclination directions of the first inclined surface and the second inclined surface are opposite to realize the corresponding guiding function.

[0027] Further, a plurality of the split and combination structures are respectively provided, and a plurality of the clamping blocks are also respectively provided correspondingly.

[0028] Further, the sizes of the plurality of clamping blocks are the same or have differences.

[0029] The sizes of the plurality of clamping blocks have differences means that the plurality of clamping blocks include at least two size specifications. For example, at least one clamping block has a size different from other clamping blocks, or even the sizes of each of the plurality of clamping blocks are different.

[0030] Preferably, alignment marks are provided on the face shell and the inner rotary cover, for indicating quick alignment and installation of the corresponding clamping blocks and clamping parts.

[0031] Further preferably, the alignment marks are provided at the positions of the clamping blocks with size differences.

[0032] Further, the plurality of split and combination structures are uniformly and spacedly distributed on the inner rotary cover, and the plurality of clamping blocks are also correspondingly uniformly and spacedly distributed on the face shell.

[0033] Preferably, the split-and-assembly structure further comprises an assembly guide provided on the inner rotary cover, the clamping block being directly connected with the clamping portion at the aligned position of the clamping portion, or being moved from the misaligned position to the aligned position of the clamping portion under the action of the assembly guide, and then being connected with the clamping portion.

[0034] The aligned position of the clamping portion refers to the aligned position of the clamping portion facing each other, which means that the clamping block and the clamping portion can be directly connected after axial displacement. The aligned position of the clamping portion can be directly provided with the clamping portion, or other transition structures connected with the clamping portion. Therefore, the aligned position of the clamping portion can refer to a position, or a structure at the position, such as the clamping portion or the transition structure connected with the clamping portion. In combination with the foregoing, the aligned position of the clamping portion in the present application can be the clamping portion itself, or the assembly groove, that is, the transition structure connected with the clamping portion is the assembly groove.

[0035] In the present application, the assembly guide has a proximal end close to the bottom of the inner rotary cover and an opposite distal end. The bottom of the inner rotary cover refers to the end that first meets or intersects during assembly of the face cover and the inner rotary cover, or the end that directly faces the face cover during assembly of the face cover and the inner rotary cover.

[0036] Preferably, the assembly guide is inclined relative to the rotation axis direction of the inner rotary cover, and has a proximal end close to the bottom of the inner rotary cover and an opposite distal end, and the aligned position of the clamping portion is adjacent to the distal end of the assembly guide; the clamping block can be moved to the aligned position of the clamping portion under the action of the assembly guide and connected with the clamping portion.

[0037] Preferably, the assembly groove is adjacent to the distal end of the assembly guide.

[0038] In a preferred embodiment, the face cover is provided with a plurality of clamping blocks equal in number to the clamping portions; each clamping portion corresponds to an assembly guide pair, and the assembly guide pair comprises two unit assembly guides, each unit assembly guide having a proximal end close to the bottom of the inner rotary cover and an opposite distal end, and the aligned position of the clamping portion is adjacent to the distal end of each unit assembly guide in the assembly guide pair. The assembly guide pair can provide a fault-tolerant space for the alignment of the face cover and the inner rotary cover, that is, to achieve non-fully-precise alignment and clamping of the face cover and the inner rotary cover. The plurality in the present application refers to more than two, including two.

[0039] Preferably, the guide surface of the assembly guide or the unit assembly guide is configured as a spiral surface, an inclined surface, or a special-shaped surface, and the special-shaped surface is a combination of different spiral surfaces, different inclined surfaces, or a combination of a spiral surface and an inclined surface. The guide surface on the assembly guide for guiding the sliding of the clamping block is referred to as an assembly guide surface.

[0040] More preferably, the guide surfaces of the two unit assembly guides are inclined surfaces, and the inclined directions of the two inclined surfaces are axially symmetrical about the inner screw cap.

[0041] In another preferred embodiment, the face shell is provided with a guided portion cooperating with the assembly guide portion, and the clamping block can be moved to the aligned position of the clamping portion under the cooperation of the assembly guide portion and the guided portion, and then the clamping block is clamped and connected with the clamping portion.

[0042] Preferably, the cooperating surfaces of the assembly guide portion and the guided portion are configured as helical surfaces, inclined surfaces, or special-shaped surfaces, and the special-shaped surfaces are different helical surfaces, different inclined surfaces, or a combination of helical surfaces and inclined surfaces; the assembly guide portion and the guided portion have the same rotational direction.

[0043] Preferably, the special-shaped surfaces are composed of different helical surfaces, different inclined surfaces, or a combination of helical surfaces and inclined surfaces, and all have the same rotational direction.

[0044] The helical motion trajectory of the moving point on the helical surface is the compound motion trajectory of the circumferential rotation and the axial motion, and the rotational direction of the helical surface refers to the motion direction of the helical motion in the circumferential direction; the motion trajectory of the moving point on the inclined surface cannot be decomposed into the circumferential motion, but since the radial distance of the moving point on the inclined surface from the rotation axis of the inner screw cap is equal, it can be regarded as having the circumferential motion (referred to as "circumferential motion"), and the rotational direction of the circumferential motion is defined as the "equivalent rotational direction". In order to unify the terminology in this application, the direction of the circumferential motion of the moving point on the helical surface or the inclined surface is uniformly defined as the "equivalent rotational direction".

[0045] The "equivalent rotational direction" of the helical surface refers to the rotational direction of the moving route of the moving point on the helical line with equal radial distance from the rotation axis of the helical surface from the proximal end to the distal end of the helical surface.

[0046] The "equivalent rotational direction" of the inclined surface or the special-shaped surface refers to the rotational direction of the moving route of the moving point on the inclined surface or the special-shaped surface with equal radial distance from the rotation axis of the inner screw cap from the proximal end to the distal end of the inclined surface or the special-shaped surface.

[0047] In this application, the proximal end of the guided portion is close to the opening end of the face shell, and the proximal end of the guided portion is the end closest to the inner screw cap when the face shell is installed on the inner screw cap.

[0048] The "equivalent rotational direction" of the assembly guide portion and the guided portion refers to the rotational direction of the moving route of the moving point on the cooperating surfaces of the assembly guide portion and the guided portion with equal radial distance from the rotation axis of the inner screw cap from the proximal end to the distal end of the assembly guide portion.

[0049] The "equivalent rotation direction" can be clockwise or counterclockwise.

[0050] Preferably, the guided part and the clamping block are in an integrated structure, the clamping block includes a clamping surface abutting against the clamping part, and the guided part is arranged on the opposite side of the clamping surface; the clamping block can be moved to the aligned position of the clamping part along the assembly guide part and clamped and connected with the clamping part. For example, the clamping surface is arranged on the upper end surface of the clamping block, and the guided part is arranged on the lower end surface of the clamping block.

[0051] Preferably, the guided part and the clamping surface are aligned in the direction parallel to the axial direction of the inner rotary cover.

[0052] Preferably, the assembly guide part is configured as a helical surface, an inclined surface or a special-shaped surface inclined relative to the rotation axis direction of the inner rotary cover.

[0053] Preferably, the helical direction or the inclined direction of the assembly guide part intersects with the rotation axis direction of the inner rotary cover. The helical direction or the inclined direction refers to the projection trajectory direction of the helical structure or the inclined surface structure of the assembly guide part projected onto the plane where the rotation axis of the inner rotary cover is located.

[0054] Preferably, the assembly guide part includes a helical surface or an inclined surface, and the guided part correspondingly includes a helical surface or an inclined surface, so that when the outer force is applied to the face shell, the guided part slides along the helical surface or the inclined surface. At this time, the assembly guide part has a single equivalent rotation direction. The "outer force" refers to the resultant force of the outer force applied to the face shell when the face shell is assembled to the inner rotary cover.

[0055] Further, the assembly guide part and the guided part are respectively configured as a first helical surface and a second helical surface in sliding fit or a first inclined surface and a second inclined surface in sliding fit.

[0056] The first helical surface includes opposite helical surface proximal end and helical surface distal end, and the helical surface proximal end of the first helical surface is close to the bottom of the inner rotary cover; the first inclined surface includes opposite inclined surface proximal end and inclined surface distal end, and the inclined surface proximal end of the first inclined surface is close to the bottom of the inner rotary cover; the first helical surface and the first inclined surface both have an equivalent rotation direction.

[0057] Preferably, each assembly guide part can be a continuous integrated structure, or can include a plurality of assembly guide segments, and small gaps can exist between the plurality of assembly guide segments, as long as the continuity of the guided part sliding on the assembly guide part is not affected.

[0058] Preferably, the inner rotary cover comprises a plurality of assembly guides and a plurality of clamping portions, the alignment position of the clamping portions is adjacent to the distal end of the assembly guides. When the guided portion slides along the assembly guide to the distal end of the assembly guide, the clamping block is aligned with the corresponding clamping portion.

[0059] Preferably, the plurality of assembly guides and the plurality of clamping portions are uniformly spaced around the outer circumferential surface of the inner rotary cover.

[0060] Preferably, there is a clamping portion between every two adjacent assembly guides, and the face shell is provided with a plurality of clamping blocks which are the same in number as the clamping portions.

[0061] Preferably, the assembly guide is protrudingly arranged on the outer circumferential surface of the inner rotary cover, and the separation groove is arranged within the circumferential range of the assembly guide.

[0062] Preferably, the separation groove is provided with a plurality of separation grooves, and each separation groove corresponds to a clamping portion.

[0063] Preferably, the assembly guide and the clamping portion form an assembly unit, the opening and closing structure is provided with a plurality of assembly units, each assembly unit comprises at least one assembly unit and one separation groove, and the plurality of assembly units are continuously and adjacently arranged around the outer circumferential surface of the inner rotary cover. The separation groove is necessarily at least partially overlapped with the assembly guide of the adjacent assembly unit in the circumferential direction, that is, the separation groove is arranged within the circumferential range of the assembly guide of the adjacent assembly unit, because the plurality of assembly units are continuously and adjacently arranged, and the separation groove and the clamping portion are circumferentially staggered.

[0064] More preferably, the separation groove is arranged on one side of the assembly guide surface of the adjacent assembly unit close to the opening end of the inner rotary cover, or the separation groove intersects with the assembly guide surface of the adjacent assembly unit.

[0065] The assembly guide surface and the separation groove can be arranged on the same bearing element, or can be arranged on different bearing elements respectively.

[0066] Further preferably, the end surface of the assembly guide is the assembly guide surface, and the side wall of the assembly guide is provided with the separation groove. The separation groove of each opening and closing structure is arranged on the side wall of the assembly guide of the adjacent opening and closing structure.

[0067] Preferably, the plurality of assembly units are uniformly arranged and surround the outer circumferential surface of the inner rotary cover for one complete circle.

[0068] The plurality of assembly units are uniformly arranged and continuously surround the outer circumferential surface of the inner rotary cover. When the face shell and the inner rotary cover are assembled, the position of the clamping block on the face shell corresponding to the inner rotary cover includes two cases: one is that the clamping block is located above the assembly guide part; the other is that the clamping block is located at the alignment position of the clamping part. When the face shell and the inner rotary cover are assembled, if the clamping block is located above the assembly guide part, the guided part on the face shell slides under the guidance of the assembly guide part until the clamping block is aligned and clamped with the clamping part under the action of the buckling external force. In another case, when the face shell and the inner rotary cover are assembled, the clamping block is located at the alignment position of the clamping part. The clamping block on the face shell moves downward along the axial direction until it is clamped with the clamping part under the action of the buckling external force. Therefore, when the face shell and the inner rotary cover are assembled, no matter which position the face shell is buckled from above the inner rotary cover, it will be directly or guided to the alignment position of the clamping part, and then clamped and connected with the clamping part. Therefore, the structure design enables the face shell to be buckled and assembled to the inner rotary cover in 360° all directions, without the need for prior alignment or foolproof design, simplifying the assembly process of the face shell and the inner rotary cover, that is, the face shell and the inner rotary cover can be clamped and connected without precise alignment.

[0069] Preferably, the side wall of the face shell is provided with a gap, and at least one side of the clamping block is adjacent to the gap. The design of the gap enhances the deformation ability of the side wall of the face shell where the clamping block is located, and further enhances the assembly and disassembly operation of the inner rotary cover and the face shell.

[0070] Further preferably, the first gap and the second gap are respectively provided on the side wall of the face shell on both sides of the clamping block. The gaps on both sides of the clamping block further enhance the elastic displacement ability of the clamping block.

[0071] More preferably, the outer circumferential surface of the inner rotary cover is provided with a number of notches corresponding to the number of separation grooves, and the separation grooves and the notches have a gap. The gap includes a radial gap and / or a circumferential gap. The gap between the separation grooves and the notches can enhance the elastic displacement ability of the separation grooves.

[0072] Further, when the separation groove is arranged on the side wall of the assembly guide part adjacent to the assembly unit, the assembly guide part includes a plurality of assembly guide segments, and at least the assembly guide segment provided with the separation groove has a gap with the notch.

[0073] Preferably, the face shell is integrally formed with a decorative structure; or the rotary cover structure further includes a decorative piece, and the decorative piece is linkably connected with the face shell.

[0074] Preferably, the face shell is integrally formed with a decorative structure, which includes that the face shell itself has a shape, the face shell has a decorative shape, the surface of the face shell has a pattern, a hollow structure, etc.

[0075] Preferably, the linkage connection between the decorative piece and the face shell includes, but is not limited to, one or more of the following: adhesion, magnetic attraction, snap connection, interference fit, and embedded fit.

[0076] Preferably, the material of the decorative piece includes, but is not limited to, silica gel, metal, plastic, and the like.

[0077] Preferably, the decorative piece includes, but is not limited to, a special-shaped piece, a silica gel drop, a light-emitting chip, and the like. The special-shaped piece includes, but is not limited to, a cartoon shape, a flower shape, a plant shape, an animal shape, a natural landscape, a vehicle shape, and the like.

[0078] In the above-mentioned cap structure for easily replacing the face shell, the face shell is provided with a clamping block, and the inner cap is provided with a split structure. The face shell can rotate relative to the inner cap. However, since the movement is mutual, the clamping block can also be arranged on the inner cap, and the split structure can be arranged on the face shell. In this way, the face shell and the inner cap can be separated by rotating the face shell.

[0079] Another object of the present application is to provide a lacing device, which includes a shell and the above-mentioned cap structure for easily replacing the face shell. The cap structure for easily replacing the face shell is rotatably arranged on the shell.

[0080] Further, the lacing device has a winding lacing mode and a loosening lacing mode. In the winding lacing mode, the inner cap of the cap structure is configured to be rotatable in a tightening direction relative to the shell and not rotatable in a loosening direction relative to the shell, and the face shell is rotatable in the loosening direction relative to the inner cap.

[0081] Therefore, in the winding lacing mode, the inner cap and the face shell of the lacing device are linked in the axial and circumferential tightening directions, but in the loosening direction, the face shell can rotate relative to the inner cap, and the two are not linked.

[0082] Preferably, the split groove is staggered with the clamping portion along the circumferential direction of the inner cap and located on one side of the clamping portion in the loosening direction. The face shell of the cap structure is rotatable relative to the inner cap, so that the clamping block is rotated from the position of the clamping portion to the position of the split groove in the loosening direction, thereby realizing the separation of the face shell and the inner cap.

[0083] Preferably, the split groove includes a first side wall close to the clamping portion and an opposite second side wall. The first side wall and the second side wall each have a proximal end close to the opening end of the inner cap and an opposite distal end. The distal end of the second side wall is configured to be inclined to one side of the loosening direction compared with the proximal end, and / or the distal end of the first side wall is configured to be inclined to one side of the tightening direction compared with the proximal end, so as to guide the clamping block to smoothly slide out.

[0084] Preferably, the split-and-assembly structure further comprises an assembly guide portion, the clamping block moves to the aligned position of the clamping portion under the action of the assembly guide portion, and then the clamping block is clamped and connected with the clamping portion.

[0085] Preferably, the face shell is provided with a plurality of clamping blocks which are the same in number as the clamping portions, each clamping portion corresponds to an assembly guide pair, the assembly guide pair comprises two unit assembly guide portions, and the clamping block can move to the aligned position of the clamping portion under the action of any unit assembly guide portion; wherein each unit assembly guide portion is inclined relative to the rotation axis direction of the inner rotating cap and has a proximal end close to the bottom of the inner rotating cap and an opposite distal end, and the aligned position of the clamping portion is adjacent to the distal end of each unit assembly guide portion in the assembly guide pair. In this application, the "unit assembly guide portion" and the "assembly guide portion" have the same function and structure.

[0086] Preferably, the face shell is provided with a guided portion matched with the assembly guide portion, the assembly guide portion has a single equivalent rotation direction, and the guided portion correspondingly has a single equivalent rotation direction.

[0087] Further preferably, the assembly guide portion and the guided portion are respectively configured as a first slidingly matched helical surface and a second helical surface or a first slidingly matched inclined surface and a second inclined surface.

[0088] Preferably, the assembly guide portion has an equivalent rotation direction opposite to the tightening direction, when an external force is applied to the face shell and faces the inner rotating cap, the guided portion slides along the assembly guide portion, at the same time, the inner rotating cap rotates in the tightening direction, the face shell moves axially until the clamping block is clamped and connected with the clamping portion.

[0089] Preferably, the inner rotating cap is further provided with a rotation transition portion, the rotation transition portion is arranged between the clamping portion and the separation groove, and is used for guiding the clamping block to rotate from the clamping portion position to the separation groove position. Therefore, the rotation transition portion is also located on the loosening direction side of the clamping portion.

[0090] Preferably, the lacing device further comprises a reverse-stopping mechanism, so that the inner rotating cap can only rotate relative to the shell in the tightening direction in the winding lacing mode; the reverse-stopping mechanism comprises a first reverse-stopping component and a second reverse-stopping component which cooperate with each other, and the first reverse-stopping component is a ratchet or a groove; the lacing device further comprises a limiting portion for limiting the axial displacement of the second reverse-stopping component. The second reverse-stopping component refers to the reverse-stopping component which cooperates with the first reverse-stopping component and can be offset. The so-called "offset" can be circumferential offset or radial offset, and the form of offset is not limited as long as it can be offset. The so-called "limiting the axial displacement of the second reverse-stopping component" does not mean that the axial displacement of the second reverse-stopping component is strictly zero, but allows a certain amount of axial displacement, as long as the structure is not damaged. For example, there is a gap between the second reverse-stopping component in the starting position and the limiting portion, but the second reverse-stopping component is in abutment with the limiting portion after the axial displacement under the action of friction, and the amount of axial displacement can be ignored and will not affect the structural stability of the second reverse-stopping component. Preferably, the amount of axial displacement of the second reverse-stopping component should not exceed the deformation threshold of the damage of the second reverse-stopping component. For example, if the second reverse-stopping component is upwarping by 100% of its own thickness, it will cause the failure of the second reverse-stopping component, and therefore the amount of axial displacement should not exceed 100% of the thickness of the second reverse-stopping component.

[0091] If the second reverse-stopping component is upwarping by 100% of its own thickness, it will cause the failure of the second reverse-stopping component, and therefore the amount of axial displacement should not exceed 100% of the thickness of the second reverse-stopping component.

[0092] Preferably, the first reverse-stopping component and the second reverse-stopping component are arranged on the shell and the inner rotating cap, respectively.

[0093] Preferably, the limiting portion and the second reverse-stopping component are arranged on the same component of the lacing device, and the limiting portion and the second reverse-stopping component form a force locking or a shape locking to limit the axial displacement of the second reverse-stopping component. The so-called "force locking" refers to the locking function realized by the external force and the counteracting force at the contact point. Specifically, the external force makes the first reverse-stopping component move upward, the friction force is generated on the meshing surface of the first reverse-stopping component and the second reverse-stopping component, the second reverse-stopping component is subjected to the friction force in the axial direction close to the first reverse-stopping component and is in contact with the limiting portion, and the counteracting force of the limiting portion applied to the second reverse-stopping component at the contact point has a component in the axial direction away from the first reverse-stopping component, so that the second reverse-stopping component cannot be axially displaced. The so-called "shape locking" refers to the locking mode of locking the relative movement of the components by means of the geometric constraints generated by the structural shape of the components. The limiting portion and the second reverse-stopping component are arranged on the same component of the lacing device, which means that they are both arranged on the shell or both arranged on the rotating cap structure.

[0094] Preferably, the second ratchet member is one of a pawl, a deflectable member, and a swing arm. As long as the ratchet member can cooperate with the ratchet teeth and can be deflected, it can be the second ratchet member.

[0095] Preferably, the ratchet mechanism further comprises a third ratchet member, the second and third ratchet members are provided on the same component of the lacing device, wherein the second ratchet member is a deflectable member, and the third ratchet member is a stop member, the head of the stop member is configured as a backstop limiting portion, and the deflectable member comprises a necked protrusion, the backstop limiting portion cooperates with the necked protrusion to limit the axial displacement of the second ratchet member.

[0096] The lacing device provided by the application can be used for tightening articles such as shoes, clothes, hats, and bags. The beneficial effects of the application include:

[0097] 1. The cap structure with a face shell convenient to replace and the lacing device comprising the same provided by the application, the face shell is provided with a clamping block, the inner cap is provided with a split structure corresponding to the clamping block, the split structure is designed to make the assembly and disassembly of the face shell and the inner cap more convenient, without the need of using tools, and the old face shell can be disassembled by only manually rotating and pulling the face shell, so that the quick replacement requirement of the face shell can be met. The setting positions of the clamping block and the split structure are exchanged, and the above functions can still be realized.

[0098] 2. The cap structure with a face shell convenient to replace and the lacing device comprising the same provided by the application, an assembly guide portion is arranged on the inner cap to provide a cap structure with non-fully-precise alignment clamping. For the cap structure with non-fully-precise alignment clamping including an assembly guide pair, when the face shell is assembled with the inner cap from above the inner cap, the face shell can fall within a certain fault tolerance space, so that the face shell and the inner cap do not need to be strictly aligned during assembly, and the correctness and convenience of assembly are increased.

[0099] 3. The assembly guide portion and the guided portion are correspondingly arranged on the inner cap and the face shell, so that when the face shell is assembled with the inner cap, the face shell is guided to slide to an alignment position to enable the clamping block and the clamping portion to be aligned and clamped. Not only time and labor are saved, but also the clamping block and the clamping portion are aligned and clamped only when the guided portion on the face shell is guided by the assembly guide portion to slide to the alignment position of the clamping portion, so that elastic deformation of the clamping block and the clamping portion is generated to align and clamp, without excessive extrusion deformation, without affecting the replacement of the face shell, and without affecting the accurate and in-place fitting of the face shell relative to the cap, so that the assembly precision is improved.

[0100] 4. The cap structure with a face shell convenient to replace provided by the application is a special case of the cap structure with non-fully-precise alignment clamping, the face shell can be assembled with the inner cap from any position above the inner cap and face the inner cap, so that the assembly of the face shell and the inner cap is more convenient and has more randomness.

[0101] 5. The screw cap structure for easy replacement of the faceplate provided by the present invention is not limited to application to the tying device, but is also applicable to other snap-fit ​​and disassembly systems with non-precise alignment installation requirements. Attached Figure Description

[0102] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0103] Figure 1 is a schematic diagram of the first embodiment of the screw cap structure for easy replacement of the faceplate provided in the present invention;

[0104] Figure 2 is a schematic diagram of the cross-sectional structure along the AA direction in Figure 1;

[0105] Figure 3 is an exploded view of the screw cap structure shown in Figure 1, which facilitates the replacement of the faceplate.

[0106] Figure 4 is a top view of the inner screw cap in the screw cap structure shown in Figure 3, which facilitates the replacement of the face shell.

[0107] Figure 5 is an exploded view of a second embodiment of the screw cap structure for easy replacement of the faceplate provided in this invention.

[0108] Figure 6 is a structural schematic diagram of the face shell from another perspective in the screw cap structure shown in Figure 5;

[0109] Figure 7 is an exploded view of a third embodiment of the screw cap structure for easy replacement of the face shell provided in this invention;

[0110] Figure 8 is an exploded view of the fourth embodiment of the screw cap structure for easy replacement of the face shell provided in the present invention;

[0111] Figure 9 is an exploded view of the fifth embodiment of the screw cap structure for easy replacement of the face shell provided in the present invention;

[0112] Figure 10 is a schematic diagram of the inner screw cap structure in the screw cap structure shown in Figure 9, which facilitates the replacement of the outer shell.

[0113] Figure 11 is an exploded view of the sixth embodiment of the screw cap structure for easy replacement of the face shell provided in the present invention;

[0114] Figure 12 is a structural schematic diagram of the shell shown in Figure 11 from another perspective;

[0115] Figure 13 is a schematic diagram of the inner screw cap shown in Figure 11;

[0116] Fig. 14 is a schematic view of a first preferred mode of the inner cap in the cap structure embodiment shown in Fig. 11;

[0117] Fig. 15 is a schematic view of a second preferred mode of the inner cap in the cap structure embodiment shown in Fig. 11;

[0118] Fig. 16 is a schematic view of a third preferred mode of the inner cap in the cap structure embodiment shown in Fig. 11;

[0119] Fig. 17 is a schematic view of another structure of the face cover in the cap structure embodiment shown in Fig. 11;

[0120] Fig. 18 is a schematic view of another structure of the face cover in the cap structure embodiment shown in Fig. 17;

[0121] Fig. 19 is an exploded schematic view of a first embodiment of the lacing device comprising the cap structure with the face cover convenient to replace according to the present application;

[0122] Fig. 20 is an exploded schematic view of a second embodiment of the lacing device comprising the cap structure with the face cover convenient to replace according to the present application;

[0123] Fig. 21 is a schematic view of the assembly structure of the deflectable member and the housing in the prior art;

[0124] Fig. 22 is a schematic view of the assembly structure of the inner cap and another reverse prevention mechanism in the cap structure with the face cover convenient to replace according to the present application;

[0125] Fig. 23 is a schematic view of the assembly structure of the deflectable member and the housing in the second embodiment of the lacing device shown in Fig. 20;

[0126] Fig. 24 is a schematic view of the assembly structure shown in Fig. 23 from the top;

[0127] Fig. 25 is a sectional view of Fig. 24 along the direction of A-A;

[0128] Fig. 26 is a force analysis diagram of the contact surface between the deflectable member and the stop member shown in Fig. 25 when the face cover and the inner cap are rotated and separated;

[0129] The implementation, functional features and advantages of the present application will be further explained with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0130] The embodiments of the present application will be described in detail below with reference to the drawings, in which the same or similar components are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and should not be construed as limiting the present application.

[0131] It should be understood that the terms indicating the orientation or positional relationship used in the description of the present application, such as "upper", "lower", "left", "right", "front", "back", "length", "width", "horizontal", "vertical", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are intended to facilitate the description of the present application and simplify the description, and cannot be understood as a limitation on the device or component referred to having a specific orientation or specific positional relationship.

[0132] In addition, the terms "first" and "second" are only used for distinguishing purposes and do not have relative importance, and are not intended to indicate or imply the number of technical features. Therefore, the features defined by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly defined.

[0133] Unless otherwise explicitly specified, the terms "connected", "fixed", etc. in the present application should be understood broadly, for example, can be fixedly connected, can be detachably connected, or can be integrally formed; can be directly connected, or can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0134] The rotating cap structure facilitating replacement of the face shell and the lacing device comprising the same will be described in detail below with reference to the accompanying drawings.

[0135] As one object of the present application, a rotating cap structure facilitating replacement of the face shell is provided, in which the face shell and the inner rotating cap can be assembled in a precise positioning and non-precise positioning manner. The "precise positioning assembly" means that the assembly of the face shell and the inner rotating cap can be achieved only when the clamping block is precisely positioned with the corresponding clamping part. The "non-precise positioning assembly", also known as non-complete precise positioning assembly, means that the assembly of the face shell and the inner rotating cap can be achieved within a certain radiation range including the precise positioning position of the clamping part. The complete non-precise positioning assembly belongs to the special case of the non-complete precise positioning assembly, that is, the clamping block can be moved to the precise positioning position of the clamping part after falling from any orientation, so that the angle of falling of the clamping block does not need to be considered at all, and the face shell can be assembled with the inner rotating cap from 360° full orientation. Among them, the embodiments shown in Figures 1 to 7 disclose the general case of the precise positioning assembly, the embodiments shown in Figures 8 to 10 disclose the general case of the non-complete precise positioning assembly, and the embodiments shown in Figures 11 to 18 disclose the complete non-precise positioning assembly. When the sizes of the plurality of clamping blocks in the embodiment are different, it also constitutes the technical scheme of the non-complete precise positioning assembly.

[0136] Referring to FIG. 1 to FIG. 4, a first embodiment of a cap structure facilitating replacement of a face shell is provided, comprising an inner cap 10 and a face shell 20 which is detachably mounted on the outer side of the inner cap 10, the face shell 20 is provided with a clamping block 201, 201a, 201b, 201c, and the inner cap 10 is provided with a split structure 101a, 101b, 101c corresponding to the clamping block 201, 201a, 201b, 201c, each split structure 101a, 101b, 101c comprises a first position P1 and a second position P2, wherein the first position P1 is provided with a clamping part, preferably, the clamping part in this embodiment is configured to be buckled into a clamping groove 1011, 1011a, 1011b, 1011c, the clamping block 201, 201a, 201b, 201c and the buckled clamping groove 1011, 1011a, 1011b, 1011c are clamped together to link the face shell 20 and the inner cap 10, and the circumferential width of the clamping block and the buckled clamping groove is basically the same. As shown in FIG. 1 to FIG. 3, FIG. 1 is a structure schematic diagram of the clamping block and the split structure at the first position P1, and the face shell 20 and the inner cap 10 are in a buckled state; FIG. 2 is a cross-sectional structure diagram of the A-A cutting line in FIG. 1; FIG. 3 is a structure schematic diagram of the inner cap 10 and the face shell 20 in a separated state. After the face shell 20 is sleeved on the outer side of the inner cap 10, the clamping block 201, 201a, 201b, 201c on the face shell 20 is clamped with the buckled clamping groove 1011, 1011a, 1011b, 1011c corresponding to the inner cap 10, thereby connecting and fixing the inner cap 10 and the face shell 20 without the aid of other tools. Further preferably, referring to FIG. 3, the split structure 101a, 101b, 101c further comprises an assembly groove, the assembly groove 1015a, 1015b is located on the outer side of the inner cap 10 corresponding to the buckled clamping groove 1011a, 1011b, and the assembly groove is used to guide the clamping block 201a, 201b, 201c to the buckled clamping groove 1011a, 1011b, 1011c when the face shell 20 and the inner cap 10 are combined. During the assembly process of the inner cap 10 and the face shell 20, the clamping block 201a, 201b, 201c on the face shell 20 can be aligned with the assembly groove. By pushing the inner cap 10 and the face shell 20 to move closer to each other by external force, the clamping block 201a, 201b, 201c can be moved along the assembly groove to the buckled clamping groove 1011a, 1011b, 1011c, thereby realizing the movement guidance of the clamping block 201a, 201b, 201c. Preferably, as shown in FIG. 3, the depth of the assembly groove 1015a, 1015b gradually increases from the buckled clamping groove 1011a, 1011b, 1011c to the bottom end of the inner cap 10.That is, the bottom surface (slot bottom) of the assembly groove 1015a, 1015b is configured as a slope S1, as shown in FIG. 2, which gradually extends in a radially outward direction from the bottom end to the opening end (top end) of the inner rotary cover, so as to guide the face shell along the slope and fasten it with the snap-in slot. In this way, when the inner rotary cover 10 and the face shell 20 are combined, the clamping blocks 201a, 201b, 201c can gradually elastically deform or elastically displace under the guidance of the assembly groove until they are in abutting fastening with the snap-in slot, and then return to their original state or position. Under the action of external force, the assembly groove guides the clamping blocks to gradually slide to the snap-in slot 1011a, 1011b, 1011c, making the combination of the inner rotary cover 10 and the face shell 20 more convenient.

[0137] A separation groove 1012, 1012a, 1012b is arranged at the second position P2 of the split and combination structure 101a, 101b, 101c, which is arranged on the outer circumferential surface of the inner rotary cover 10 and is close to the snap-in slot 1011, 1011a, 1011b, 1011c, and is offset by a certain angle a from the snap-in slot along the circumferential direction of the outer circumferential surface of the inner rotary cover, and the offset angle range is preferably 5°-180°, as shown in FIG. 1, and the offset angle a in this embodiment is 30°. The face shell 20 can also be rotated relative to the inner rotary cover 10 to rotate the clamping blocks 201, 201a, 201b, 201c to the separation groove 1012, 1012a, 1012b, and separate the face shell 20 from the inner rotary cover 10 through the separation groove 1012, 1012a, 1012b. Since the inner rotary cover 10 and the face shell 20 are connected through the clamping block-snap-in slot, if it is necessary to directly separate the inner rotary cover 10 and the face shell 20, other tools are needed to pry the clamping block, so that the clamping block is separated from the snap-in slot, and then the inner rotary cover 10 and the face shell 20 are separated from each other. Therefore, directly separating the clamping block on the face shell 20 from the snap-in slot on the inner rotary cover 10 is relatively troublesome for the user, and requires tools and skills, resulting in a certain difficulty in replacing the face shell 20.

[0138] In the embodiment of the present application, the inner rotating cover 10 is provided with a separation groove 1012, 1012a, 1012b on the outer side of the inner rotating cover 10, and the separation groove is located on the side of the inner rotating cover 10 close to the buckle slot. When it is needed to separate the inner rotating cover 10 and the face shell 20, the face shell 20 is rotated to make the face shell 20 and the inner rotating cover 10 relatively rotate, so that the clamping blocks 201, 201a, 201b, 201c are rotated away from the corresponding buckle slots 1011, 1011a, 1011b, 1011c and are moved to the positions of the corresponding separation grooves 1012, 1012a, 1012b. Since there is no clamping abutting surface between the clamping blocks 201, 201a, 201b, 201c and the separation groove of the inner rotating cover 10, when the face shell 20 is pulled by external force, the face shell 20 can drive the clamping blocks 201, 201a, 201b, 201c to slide along the extension direction of the separation groove 1012, 1012a, 1012b, and finally separate from the inner rotating cover 10. When the clamping blocks 201, 201a, 201b, 201c are separated from the inner rotating cover 10, the inner rotating cover 10 and the face shell 20 can be separated from each other. In the embodiment, the circumferential width of the separation groove is basically the same as the circumferential width of the clamping block, and in other embodiments, the circumferential width of the separation groove can be greater than the circumferential width of the clamping block. The design of the separation groove makes the separation operation of the inner rotating cover 10 and the face shell 20 more simple and easy. The user only needs to rotate and pull the face shell 20 by hand to separate the inner rotating cover 10 and the face shell 20, without the need of other tools, thereby simplifying the replacement operation of the face shell 20. Even the user with poor operation ability can change the face shell 20 with favorite appearance according to his own preference to meet the demand of replacing the appearance of the face shell.

[0139] Referring to FIG. 4, the split and combination structure 101a, 101b, 101c further comprises a rotating transition T, which is arranged between the buckling slot 1011 and the separation groove 1012, and is used to guide the rotating transition of the clamping block 201a, 201b, 201c to the position of the separation groove 1012a, 1012b; preferably, as shown in FIGS. 3 and 4, the buckling slot 1011 and the separation groove 1012 are communicated through the rotating transition T. The rotating transition T comprises a transition arc surface 1013a, 1013b, which is arranged adjacent to the buckling slot 1011a, 1011b, 1011c near the separation groove 1012a, 1012b, and is used to guide the clamping block 201a, 201b, 201c to smoothly leave the buckling slot when the face shell 20 and the inner rotary cover 10 are rotated and separated. As shown in FIG. 3, by arranging the transition arc surface 1013a, 1013b on the side of the buckling slot 1011a, 1011b, 1011c near the separation groove 1012a, 1012b, the transition arc surface can reduce the blocking force on the side wall of the clamping block 201a, 201b, 201c when the inner rotary cover 10 and the face shell 20 need to be separated from each other, so that the rotation of the clamping block is more smooth, and the clamping block 201a, 201b, 201c is guided to move out of the buckling slot more smoothly. Among them, the transition arc surface 1013a, 1013b can be a circular arc surface. Through the circular arc transition surface on one side of the buckling slot 1011a, 1011b, 1011c, the blocking force on the clamping block 201a, 201b, 201c can be reduced, so that the clamping block 201a, 201b, 201c can be guided to leave the buckling slot 1011a, 1011b, 1011c under the action of appropriate external force.

[0140] Referring to FIG. 3 and FIG. 4, the rotating transition part T further comprises rotating guide parts 1014a, 1014b, which are arranged between the separation grooves 1012a, 1012b and the transition curved surfaces 1013a, 1013b, and form rotating transition steps between the rotating guide parts 1014a, 1014b and the outer side of the inner rotating cover 10, which are used to support the rotating movement of the clamping blocks 201a, 201b, 201c to the separation grooves 1012a, 1012b. As shown in FIG. 3, when the inner rotating cover 10 and the face shell 20 need to be separated from each other, the face shell 20 is rotated to cause the relative displacement between the inner rotating cover 10 and the face shell 20, and the transition curved surfaces 1013a, 1013b reduce the blocking force of the clamping blocks 201a, 201b, so that the clamping blocks are separated from the clamping slots. After the clamping blocks are separated from the clamping slots, they can enter the rotating guide parts 1014a, 1014b. Since the rotating guide parts 1014a, 1014b form rotating transition steps between the rotating guide parts 1014a, 1014b and the outer side of the inner rotating cover 10, the rotating transition steps can guide the clamping blocks 201a, 201b, 201c to rotate along the rotating transition steps and support the bottom of the clamping blocks 201a, 201b, 201c, so that the clamping blocks 201a, 201b, 201c can rotate along the rotating transition steps to the separation grooves 1012a, 1012b, and then be separated from the inner rotating cover 10 through the separation grooves. The rotating transition steps can avoid the clamping blocks 201a, 201b, 201c being separated from the inner rotating cover 10 from the non-separation grooves 1012a, 1012b, so as to avoid the clamping blocks 201a, 201b, 201c being damaged when they are separated from the non-separation grooves 1012a, 1012b under the action of a large pulling force. In an embodiment of the present application, the depth of the separation grooves can gradually decrease from the top end (opening end) to the bottom end of the inner rotating cover 10, so that the bottom surface of the separation grooves forms an inclined surface as a guide surface, so that the inner rotating cover 10 and the face shell 20 can be gradually and smoothly separated under the action of an external force.

[0141] In order to make the clamping block more easily slide along the assembling groove or the separating groove when the face shell 20 and the inner rotary cover 10 are assembled or separated, the elastic deformation capacity or the elastic displacement capacity of the clamping block needs to be increased. Referring to FIG. 3, the side wall of the face shell 20 is provided with a slit, at least one side of the clamping block is adjacent to the slit, and preferably, the side wall of the face shell 20 is provided with a first slit 202 and a second slit 203 corresponding to the two sides where the clamping block 201c is located, so that the side wall of the face shell carrying the clamping block 201c becomes an elastic plate 2012c, and the clamping block 201c is located above the corresponding elastic plate 2012c, the elastic plate 2012c and the clamping block 201c located above it form an elastic buckle B3; similarly, the clamping blocks 201a and 201b and the elastic plates carrying them form elastic buckles B1 and B2. The elastic plate can provide a certain reset elastic force for the clamping block, and will not cause damage to the clamping blocks 201a, 201b and 201c when the inner rotary cover 10 and the face shell 20 are combined or disassembled. The clamping blocks 201a, 201b and 201c are lug structures and protrude radially inward relative to the elastic plate in order to be in contact with the buckling clamping groove. The first slit 202 and the second slit 203 can be in a hollow manner and be etched or hollowed in the face shell 20, or be formed by injection molding during the injection molding production process of the face shell 20. These two ways can make the elastic buckles B1, B2 and B3 and the main body of the face shell 20 an integrated part, so that the clamping blocks 201a, 201b and 201c are not easily damaged or separated during use.

[0142] Although the gaps formed on both sides of the clamping block to form the elastic buckle make the face shell and the inner rotary cover more convenient to operate when assembling and separating, and the clamping block is not easy to be damaged, the gaps on the face shell also limit the appearance design or design style of the face shell. Therefore, the second embodiment of the rotary cover structure for facilitating replacement of the face shell is provided, as shown in FIGS. 5 and 6, the side wall of the face shell 20' is not provided with a gap, and preferably, the clamping blocks 201A, 201B and 201C are integrally formed with the face shell 10'. Preferably, the face shell in this embodiment is a plastic product, and the material of the clamping blocks 201A, 201B and 201C is plastic. The plastic product itself has a certain elastic deformation capability, so that the clamping block has a certain elastic deformation (or elastic displacement) capability during the process of being connected with the buckling clamping groove or being separated from the separation groove. Although the elastic deformation causes a small elastic displacement, in combination with the design of the assembly groove and the separation groove, the function of replacing the face shell can still be realized without damaging the structure of the face shell. Further preferably, the side wall of the clamping block and the face shell in this embodiment has a certain elastic deformation capability. Compared with the face shell shown in FIG. 3, the structure design of the face shell is more convenient for designing different decorative appearances and styles to meet the aesthetic needs of different customers. Further, in order to reduce the difficulty of the clamping blocks 201A, 201B and 201C being assembled with the buckling clamping groove or being separated from the separation groove, the circumferential size of the clamping blocks 201A, 201B and 201C can be made a little smaller, so that the resistance during assembly and separation is also correspondingly reduced. Further, the buckling clamping groove of FIG. 3 is a through groove in the direction of the side wall of the inner rotary cover (see FIGS. 2 and 3, 1011), while the buckling clamping groove and the assembly groove shown in FIG. 5 form a step for clamping the clamping blocks 201A, 201B and 201C. In this application, the buckling clamping groove can be any structure as long as it can form a step for clamping the clamping blocks.

[0143] Further, the front face structure of the clamping blocks 201A, 201B and 201C on the face shell shown in FIG. 6 is also different from that of the clamping block 201 shown in FIG. 2. As shown in FIG. 2, the front face of the clamping block 201 includes a guide surface G1, which is an inclined surface, so that the clamping block can be more smoothly moved through the assembly groove to the buckling clamping groove. However, there is a problem, that is, in the case that the elasticity of the clamping block is large enough or the elastic displacement capability is strong enough, the clamping block can also slide along the side wall of the inner rotary cover at a position other than the assembly groove due to the existence of the guide surface G1, thereby causing assembly error. In order to improve the accuracy of assembly, as shown in FIG. 6, the front face of the clamping block is not provided with a guide surface, and the elastic displacement capability of the clamping block in this embodiment is also small. Therefore, the clamping block can only slide along the assembly groove to the buckling clamping groove, but cannot slide along other positions of the outer side of the inner rotary cover, thereby further increasing the accuracy of assembly and also having a certain foolproof function.

[0144] Referring to FIG. 3, a plurality of split and combination structures are respectively provided, and a plurality of clamping blocks are also respectively provided. Through the cooperation of the plurality of split and combination structures 101a, 101b, 101c and the plurality of clamping blocks 201a, 201b, 201c, the face shell 20 can be more stably buckled on the inner rotary cover 10. Among them, a plurality of buckling clamping grooves are uniformly and evenly distributed on the inner rotary cover 10; a plurality of clamping blocks 201a, 201b, 201c are also uniformly and evenly distributed on the face shell 20. In this way, the buckling force between the inner rotary cover 10 and the face shell 20 is more uniform, and the buckling between the two is more closely, and in the use process, the face shell 20 is not easy to accidentally fall off. Among them, the plurality of clamping blocks 201a, 201b, 201c shown in FIG. 3 have the same size structure, so the face shell 20 can be buckled with the inner rotary cover 10 from multiple angles. In the embodiment shown in FIG. 3, the face shell 20 can be aligned and buckled with the inner rotary cover 10 every 120° of rotation. In other preferred embodiments, the face shell can only be designed to be buckled with the inner rotary cover at a specific orientation. Specifically, referring to FIGS. 5 and 6, a plurality of clamping blocks 201A, 201B, 201C are provided on the face shell 20', and a plurality of split and combination structures (not labeled in the figure) are also provided on the inner rotary cover. Different from the embodiment shown in FIG. 3, the width of the clamping block 201A in this embodiment is greater than the width of the clamping blocks 201B and 201C, and the size of the buckling clamping groove, the assembly groove and the separation groove corresponding to the clamping block 201A is also greater than that of the other two. Optionally, the size of the rotation transition part in this application is not limited, as long as it can realize the function of guiding the clamping block to smoothly rotate from the buckling clamping groove to the separation groove. The differential setting of the size of the clamping block in this embodiment makes the face shell 20' only buckle with the inner rotary cover 10' from one orientation.

[0145] Further, in order to more quickly find the fastening position of the face shell and the inner rotary cover, referring to Figs. 5 and 6, the fastening clamping groove 1011A and the clamping block 201A of the face shell 20' and the inner rotary cover 10' are provided with alignment marks 102 and 204, wherein the clamping block 201A is designed with different sizes, and in combination with the alignment marks, the user can directly align the installation, which is more intuitive and easy to operate. Further, as long as one of the clamping blocks on the face shell has a different size from the others, the foolproof function can be achieved; for example, in the embodiment, the three clamping blocks can have only one clamping block with a different size from the other two, or the three clamping blocks can all have different sizes. The alignment marks for installation can be provided at any clamping block position, as long as the clamping block and the fastening clamping groove provided with the corresponding marks belong to a pair of combinations for alignment installation. In addition, the alignment mark 102 can be provided at one or more positions on the bottom of the assembly groove, the bottom of the fastening clamping groove, or the bottom surface of the inner rotary cover corresponding to the fastening clamping groove or the assembly groove. As shown in Fig. 5, the bottom surface of the inner rotary cover 10' and the bottom of the assembly groove are both provided with arrows as alignment marks. Further, the alignment marks on the face shell 20' can be provided on the clamping blocks, the side walls of the clamping blocks, or the side walls or the bottom surface of the face shell corresponding to the positions of the clamping blocks. Referring to Fig. 6, the upper end surface of the clamping block 201A is provided with an angular groove as an alignment mark 204. The angular groove has no effect on the elastic deformation ability of the clamping block. In addition, the shape of the alignment mark is not limited, and the structure is not limited, as long as it can play a marking role.

[0146] The structure of the rotary cover shown in Fig. 5 is consistent with other parts of the structure shown in Fig. 3. Among them, the depth of the separation groove 1012A can remain unchanged from the top end (opening end) of the inner rotary cover 10' to the middle L, and gradually shallow from the middle L to the bottom end, so that the local bottom surface of the separation groove forms an inclined surface, which serves as a guide surface, so that the inner rotary cover 10' and the face shell 20' can be gradually and smoothly separated under the action of external force.

[0147] In order to optimize the exit performance of the separation groove, the third embodiment of the screw cap structure facilitating replacement of the face cover is provided, by setting the structure and orientation of the side wall of the separation groove, so that the user can slide out of the separation groove when rotating the card block from the clamping part position to the separation groove position. Specifically, as shown in FIG. 7, the separation groove 1012 includes a first side wall L1 close to the clamping part 1011 and an opposite second side wall L2, the second side wall L2 of the separation groove can be set to gradually move away from the clamping part 1011 along the circumference from the proximal end N to the distal end F, wherein the end of the second side wall L2 close to the inner screw cap opening end is the proximal end N, and the end close to the inner screw cap bottom end is the distal end F, so as to set, when the card block is moved from the clamping part position to the separation groove by rotating the face cover, if the user does not stop applying the rotating force when the card block reaches the separation groove but continues to apply the rotating force in the same direction, the card block will slide out along the second side wall L2 under the action of the rotating force, the inclination angle design of L2 will not cause the card block to be impacted and facilitate its smooth sliding out. In this embodiment, the angle between the first side wall L1 of the separation groove and the plane where the inner screw cap opening end is located is a right angle, the assembly groove and the clamping part are set basically the same as the embodiment shown in FIG. 5, the entrance of the assembly groove is designed with a chamfer, so that the card block slides in more smoothly, the card block 201 is provided with three, and the inner screw cap and the face cover are respectively provided with alignment marks 102 and 204, so as to facilitate the accurate alignment of the card block.

[0148] The embodiments shown in FIGS. 1-7 require accurate alignment of the card block with the card interface to be correspondingly buckled, regardless of the uniform size or size difference of the card block, to achieve smooth assembly of the face shell and the inner rotary cover. Further, to solve the problem of slow assembly caused by accurate alignment, an assembly guide can be provided on the inner rotary cover, so that the face shell can be non-fully accurately aligned and buckled with the inner rotary cover within a certain range. As shown in FIG. 8, the fourth embodiment of the rotary cover structure includes an inner rotary cover 10 and a face shell 20, which is detachably mounted on the outer side of the inner rotary cover 10. The face shell 20 is provided with a card block, and the inner rotary cover 10 is provided with a card interface 1011. The card block and the card interface 1011 are clamped together to link the face shell 20 and the inner rotary cover 10. The difference from the previous embodiments is that the split and combination structure on the inner rotary cover 10 of the present embodiment further includes an assembly guide (12L, 12R). The guide surface of the assembly guide (12L, 12R) has a proximal end near the bottom of the inner rotary cover 10 and an opposite distal end. The card interface 1011 is adjacent to the distal end of the assembly guide (12L, 12R), so that the card block can slide along the guide surface of the assembly guide to the distal end of the assembly guide from a non-aligned position at least partially offset from the card interface 1011, and then reach an aligned position facing each other with the card interface 1011, and then the card block and the card interface 1011 are aligned and buckled. It is obvious that when the card block falls from the face shell and is just in the aligned position facing each other with the card interface 1011, the card block is directly aligned and buckled with the card interface 1011 after axial movement. Preferably, one card interface 1011 corresponds to one assembly guide pair, and the assembly guide pair includes two unit assembly guides 12L and 12R. The distal end of each unit assembly guide 12L and 12R in the assembly guide pair is adjacent to the same card interface 1011.

[0149] Further, the card blocks on the face cover in the embodiment can be provided as one or more same as the number of the card connecting portions 1011, and one or more sets of assembly guide pairs are correspondingly provided. Preferably, one set of assembly guide pairs 12L and 12R corresponds to one card connecting portion 1011, and the assembly guide pairs 12L and 12R are correspondingly provided on the two sides of the card connecting portion 1011, and a fault-tolerant alignment space SP is formed between the two assembly guide pairs 12L and 12R, so that when the corresponding card block falls from any position above the fault-tolerant alignment space SP and is buckled with the inner rotating cover 10, the card block can be buckled with the card connecting portion 1011 in the fault-tolerant alignment space SP under the action of any single unit assembly guide pair, so as to realize non-fully accurate alignment buckling. Specifically, the card blocks in the embodiment include three card blocks, the corresponding card connecting portions 1011 are three, and the assembly guide pairs are also three pairs. The assembly guide pairs corresponding to the card connecting portion 1011 are 12L1 and 12R1, and a fault-tolerant alignment space SP1 is formed between the two assembly guide pairs 12L1 and 12R1. The card block falls from any position above the fault-tolerant alignment space SP1, and is either slid to the alignment position of the card connecting portion 1011 under the action of the assembly guide pairs 12L1 and 12R1 and then buckled with the card connecting portion 1011, or directly falls from the alignment position of the card connecting portion 1011 and then buckled with the card connecting portion 1011. The assembly guide pairs 12L and 12R are provided, so that the card block can slide from the non-accurate alignment position of the card connecting portion and be buckled with the card connecting portion. The fault-tolerant alignment space formed by the assembly guide pairs provides a certain degree of freedom for the non-accurate alignment buckling of the face cover 20 and the inner rotating cover 10. Referring to FIG. 8, the unit assembly guide pairs 12L or 12R are inclined relative to the rotating axis direction of the inner rotating cover 10, and the unit assembly guide pairs 12L and 12R are oppositely inclined relative to the rotating axis direction. Specifically, as shown in FIG. 8, the proximal end of 12L is inclined to the left, and the proximal end of 12R is inclined to the right, which is approximately horn-shaped. In this way, a larger fault-tolerant alignment space can be provided for the buckling of the face cover and the inner rotating cover. Of course, the assembly guide pairs can also be provided as only one, such as only 12L on the left side or only 12R on the right side, and then a limiting wall parallel to the rotating axis direction of the inner rotating cover is provided on the other side, so that the card block can only slide along one side until buckled with the card connecting portion. The inner rotating cover only provides a single fault-tolerant alignment space, and the range of alignment angles that the face cover can select when assembling with the inner rotating cover is reduced. Further preferably, the guide surfaces of the assembly guide pairs 12L or 12R are constructed as inclined surfaces or helical surfaces. Of course, the guide surfaces can also be provided as special-shaped surfaces, such as inclined surfaces or helical surfaces with different slopes, etc.; and the end of the card block is provided with a chamfer, so that it is easier to slide along the guide surface. Further, the sizes of the three card blocks can be the same, so that each card block can be buckled with any one of the three card connecting portions, and the range of falling directions that the face cover can select when assembling with the inner rotating cover is wider. In other preferred embodiments, the sizes of the three card blocks can also be inconsistent, and the sizes of the card connecting portions can be adjusted adaptively according to the sizes of the card blocks, so that the card blocks and the card connecting portions form a one-to-one correspondence.When the face shell is assembled to the inner rotary cover, the clamping block can only fall from the fault-tolerant alignment space SP1 corresponding to the clamping portion 1011. Although the size of the clamping block is different, the randomness of the face shell clamping direction is reduced, but the different clamping blocks also have a foolproof function, and the fault-tolerant alignment space of each clamping block when aligned provides a certain degree of freedom of choice, which can meet the needs of some user groups for randomness and a certain degree of accuracy when assembling the face shell and the inner rotary cover.

[0150] Further, as shown in FIG. 8, in the present embodiment, the depth of the separation groove 1012 can gradually decrease from the top end (opening end) TS of the inner rotary cover 10 to the bottom end, so that the bottom surface of the separation groove forms an inclined surface. The separation groove 1012 is thus designed so that when the clamping block is rotated to the position of the separation groove 1012 from the clamping portion 1011, the contact between the clamping block and the separation groove 1012 becomes loose at the moment, and at this time, only an upward pulling force is needed to easily separate the face shell 20 from the inner rotary cover 10. Moreover, the separation groove 1012 includes a first side wall L1 close to the clamping portion and an opposite second side wall L2, wherein by setting the structure and orientation of the second side wall L2, the clamping block can be smoothly guided out. Further, in the present embodiment, the included angle γ between the second side wall L2 of the separation groove 1012 and the plane of the top end (opening end) TS of the inner rotary cover is an acute angle or a right angle, and specifically, the included angle γ is an acute angle in the present embodiment, and preferably, the included angle γ is any angle within the range of 60°-90°. As shown in FIG. 8, the opening close to the bottom end of the inner rotary cover of the separation groove 1012 is smaller than the opening close to the top end (opening end) of the inner rotary cover, that is, the included angle between the first side wall L1 and the plane of the top end TS of the inner rotary cover can also be set to an acute angle or a right angle. Further preferably, when at least one of the first side wall L1 and the second side wall L2 of the separation groove 1012 has an acute angle with the top end (opening end) TS of the inner rotary cover, since the opening close to the bottom end of the inner rotary cover of the separation groove 1012 is small, when the face shell is assembled to the inner rotary cover from above the bottom end of the inner rotary cover, the clamping block on the face shell is not easy to be clamped to the separation groove, which can reduce the misassembly rate caused by alignment errors.

[0151] In order to further optimize the assembling performance and separation performance of the face shell and the inner screw cap, and increase the user's recognition of the mismatch of the assembly, the fifth embodiment of the screw cap structure with the replaceable face shell is provided. As shown in FIG. 9, the split and combination structure of the embodiment also includes an assembly guide pair to provide a fault-tolerant alignment space when the block is assembled, and the structure of the assembly guide pair is consistent with that of the embodiment shown in FIG. 8. On the other hand, the structure of the separation groove in the embodiment is optimized. Specifically, referring to FIGS. 9 and 10, the distal end F1 of the first side wall L1 of the separation groove 1012 in the embodiment is closer to the assembly guide 12R than the proximal end N1, and the distal end F2 of the second side wall L2 is farther away from the assembly guide 12R than the proximal end N2. In other words, as shown in FIG. 10, the first side wall L1 and the inner screw cap top end (opening end) TS form an obtuse angle θ, and the second side wall L2 and the inner screw cap top end (opening end) TS form an obtuse angle γ, and preferably, the angle γ is any angle within the range of 100° to 120°. In this way, the second side wall L2 of the separation groove has the same effect of guiding the block to slide out as the embodiment shown in FIG. 7.

[0152] The inclined arrangement of the first side wall L1 makes the opening of the separation groove near the bottom end of the inner screw cap larger, so that the user can easily misassemble the block to the separation groove when assembling the face shell to the inner screw cap. However, even if the block is misassembled, the user can quickly recognize the misassembly because when the block is misassembled to the separation groove 1012, no matter whether the user rotates the face shell in the clockwise direction or the counterclockwise direction, the block will slide out along the first side wall L1 or the second side wall L2, and will not be tightly fitted with the inner screw cap. At this time, the user clearly recognizes the installation error, and then correctly connects the block to the installation position. Therefore, the structure design of the separation groove in the embodiment not only optimizes the exit performance of the block, but also improves the mismatch recognition of the assembly, and is more convenient for the user's unconscious operation, which belongs to a special foolproof design.

[0153] The face shell can be attached to the inner cap in a non-precise alignment manner, but the angle range of the face shell falling is limited, which belongs to the general scheme of non-precise alignment clamping. In order to further increase the optional alignment of the face shell during assembly, and even realize the 360° omnidirectional clamping of the face shell and the inner cap, as shown in FIGS. 11-18, a cap structure capable of realizing completely non-precise alignment clamping is provided by setting a guided part on the face shell cooperating with the assembly guide part. For example, FIGS. 11-13 provide an embodiment of a cap structure that is completely non-precise alignment clamping, including an inner cap 100 and a face shell 200, which is detachably mounted on the outer side of the inner cap 100. The face shell 200 is provided with a clamping block 210, and the inner cap 100 is provided with a clamping part 110. The clamping block 210 and the clamping part 110 are clamped to connect the face shell 200 and the inner cap 100 in linkage. The split and combination structure on the inner cap 100 also includes an assembly guide part 120, and the face shell 200 is provided with a guided part 220 corresponding to the assembly guide part 120. Under the cooperation of the assembly guide part 120 and the guided part 220, the clamping block 210 can be moved from a non-aligned position at least partially offset from the clamping part 110 to an aligned position facing each other with the clamping part 110, and then the clamping block 210 and the clamping part 110 are aligned and clamped. It is obvious that when the clamping block 210 is just in the aligned position facing each other with the clamping part 110, the clamping block 210 can be directly aligned and clamped with the clamping part 110 after axial movement.

[0154] Further, the assembly guide part 120 is axially inclined relative to the inner cap, and the axial direction of the inner cap in FIG. 11 is the vertical direction. The assembly guide part 120 has a proximal end near the bottom of the inner cap and an opposite distal end, and the clamping part 110 is adjacent to the distal end of the assembly guide part 120. Therefore, when assembling the face shell 200 and the inner cap 100, the face shell 200 can be moved to the aligned position of the clamping block 210 and the clamping part 110 under the cooperation of the assembly guide part 120 and the guided part 220 to realize the alignment and clamping of the two, and the assembly operation is more casual and fast. Such design makes the face shell not need to align the inner cap in a specific direction, and also makes the clamping block move to the aligned position of the clamping part under the guidance of the assembly guide part and the guided part, ensuring that the face shell 200 and the inner cap can be accurately and accurately connected, avoiding the trouble of precise alignment, and improving the assembly speed and success rate.

[0155] Preferably, the assembly guide 120 and the guided part 220 can be configured as one helical surface or one inclined surface with a single equivalent rotation direction, specifically, including a first helical surface 121 and a second helical surface 221 or a first inclined surface and a second inclined surface in slip fit. In the present embodiment, the guided part 220 is in one-piece structure with the clamping block 210 and opposite to the clamping surface 211; in other embodiments, the guided part 220 can also be an independent component. As shown in FIG. 13, the first helical surface 121 includes a helical surface proximal end P near the bottom of the inner rotating cap and an opposite helical surface distal end D, and the clamping part 110 is adjacent to the helical surface distal end D. The direction from the helical surface proximal end P to the helical surface distal end D is the helical direction of the helical surface, and the equivalent rotation direction of the first helical surface 121 is counterclockwise. Further, the helical surface distal end of the first helical surface 121 is adjacent to and preferably located at the middle of the outer peripheral surface of the inner rotating cap 100 in the axial direction, and the structure of the second helical surface 221 is adapted to that of the first helical surface 121, which will not be described here. The "middle" in the present application not only refers to the exact middle position of the axial height of the inner rotating cap, but also includes any intermediate position between the bottom and the opening end of the inner rotating cap. In other preferred embodiments, the assembly guide 120 and the guided part 220 can also be configured as a combination of multiple helical surfaces and / or multiple inclined surfaces with the same equivalent rotation direction.

[0156] With continued reference to FIGS. 11-13, preferably, as a sixth embodiment of the rotating cap structure for facilitating the replacement of the face cover, in the present embodiment, the assembly guide 120 and the guided part 220 are respectively described by taking the helical surface as an example, and the equivalent rotation direction of the helical surface of the assembly guide is counterclockwise. When the face cover is subjected to a vertical downward pressure and a clockwise torsion (rotational force), the face cover moves downward along the axial direction while the inner rotating cap rotates in the clockwise direction, so that the guided part slips along the assembly guide, causing the clamping block to slip to the aligned position of the clamping part, thereby achieving the clamping of the face cover and the inner rotating cap. In the application of the present embodiment (such as the lacing device shown in any one of FIGS. 19 and 20), the clockwise direction is the tightening direction of the lacing device, and the equivalent rotation direction of the assembly guide is counterclockwise. Therefore, the rotation of the inner rotating cap in the clockwise direction is allowed, and the face cover only needs to move downward along the axial direction, providing a good user experience. However, the clockwise direction and the counterclockwise direction are only for the specific embodiment in the view, and the tightening direction of the lacing device is not limited to the clockwise direction. It is worth noting that when the face cover moves downward along the axial direction, the rotatable direction of the inner rotating cap is the tightening direction of the lacing device, and at this time, the equivalent rotation direction of the assembly guide is opposite to it.

[0157] Similar to the foregoing embodiment, the present embodiment also comprises a separation groove 130 and a rotation transition portion 140, as shown in FIG. 13, to realize simple separation of the rotary cover structure; the difference is that the separation groove 130 in the present embodiment is arranged on the outer circumferential surface of the inner rotary cover and is located within the circumferential range covered by the assembly guide portion. Since the face cover in the present embodiment can be dropped from any angle to realize assembly with the inner rotary cover, the assembly units composed of the assembly guide portion and the clamping portion are arranged continuously along the outer circumference of the inner rotary cover, so it is not possible to separately reserve space for the separation groove in the circumferential direction as in the foregoing embodiment, and the separation groove can only be arranged within the circumferential range covered by the assembly guide portion of the adjacent assembly unit. However, since the deformation of the clamping block 210 and the separation groove 130 is relatively poor, the rotary cover structure shown in FIG. 11 will be slightly laborious when the face cover and the inner rotary cover are separated. In order to further optimize the separation operation of the face cover and the inner rotary cover, the elastic deformation capability of the clamping block or the separation groove can be increased.

[0158] Preferably, as shown in FIG. 14, the outer side wall of the inner rotating cover 100A is provided with notches 150 corresponding to the number of separation grooves, and the part of the assembly guide portion provided with the separation grooves has a radial gap between the notches 150, so as to increase the elastic deformation capacity of the separation grooves 130A1. Specifically, in this embodiment, the end surface of the assembly guide portion 120A1, 120A2 is provided as an assembly guide surface, and the side surface of the assembly guide portion extends in the axial direction to the opening end of the inner rotating cover. The rotating transition portion of the same split structure as the clamping portion 110A1 is arranged at the side surface of the assembly guide portion 120A2 adjacent to the clamping portion 110A1. The separation groove 130A1 of the same split structure as the clamping portion 110A1 is adjacent to the rotating transition portion and is arranged on the side surface of the assembly guide portion 120A2 and extends in the axial direction of the inner rotating cover. In order to further increase the elastic deformation capacity of the separation groove 130A1, preferably, the assembly guide portion 120A2 includes multiple segments, and in this embodiment, two assembly guide portion segments are included. The assembly guide portion segment provided with the separation groove 130A1 has a gap in the circumferential direction between the adjacent structure. Specifically, the assembly guide portion segment provided with the separation groove 130A1 has circumferential gaps 1001, 1002 between the clamping portion 110A1 and the adjacent assembly guide portion segment 120A2(R). Preferably, the gap 1002 between the assembly guide portion segment provided with the separation groove and the adjacent assembly guide portion segment is preferably relatively narrow, so that when the guided portion on the face shell slides along the assembly guide portion, the continuity of the sliding will not be affected by the existence of the gap 1002. In other preferred embodiments, most of the assembly guide portion is arranged to have elasticity, and the clamping portion and a small part of the assembly guide portion adjacent to the clamping portion belonging to the same assembly unit are preferably not elastic, as shown in FIGS. 15 and 16. In the rotating cover embodiments shown in FIGS. 14 to 16, the clamping block is arranged to have low elasticity, and the clamping portion has low elasticity, which is more conducive to the firm clamping between the face shell and the inner rotating cover. At the same time, the separation groove is arranged to be elastic, which makes it more labor-saving, convenient, and smooth when the clamping block and the separation groove are disassembled.

[0159] Another embodiment for optimizing the disassembly performance of the face shell and the inner rotating cover in the sixth embodiment can be seen from FIGS. 17 and 18. In this embodiment, the structure of the face shell 200A is changed to increase the elastic deformation capacity of the clamping block 210. The side wall of the face shell 200A is provided with slits 231 and 232 on both sides. The design principle is consistent with that of the face shell shown in FIG. 3, which will not be described here. In addition to strengthening the elastic deformation capacity of the clamping block or the separation groove respectively, the disassembly performance of the face shell and the inner rotating cover in the sixth embodiment can also be optimized by simultaneously strengthening the elastic deformation capacity of both. Therefore, any inner rotating cover shown in FIGS. 14 to 16 can be used with the face shell shown in FIGS. 17 and 18.

[0160] In combination with reference to FIGS. 11-16, preferably, the inner rotary cover comprises a plurality of assembly guide portions and a plurality of clamping portions, one clamping portion is arranged between every two adjacent assembly guide portions, and the face shell is provided with a plurality of clamping blocks which are the same in number as the clamping portions. In this way, when an external force is applied to the face shell to fasten the inner rotary cover, the plurality of assembly guide portions and the plurality of guided portions are simultaneously slidably fitted, and the plurality of clamping blocks are correspondingly aligned and clamped with the plurality of clamping portions, so as to improve the speed and stability of the assembly of the face shell and the inner rotary cover.

[0161] Please refer to FIGS. 11-18, every two adjacent assembly guide portions 120A1 and a clamping portion 110A1 form an assembly unit. The inner rotary cover is provided with a plurality of assembly units, and the plurality of assembly units are uniformly arranged around the outer circumferential surface of the inner rotary cover. In this way, when the face shell is fastened to the inner rotary cover from any angle above the inner rotary cover, the clamping block is either directly aligned with the clamping portion or guided to the position of the aligned clamping portion under the cooperation of the guided portion and the assembly guide portion. On the other hand, the axial movement of the face shell towards the inner rotary cover is more stable and uniform in speed, so that the axial movement of the face shell is basically translational and is not easy to produce deflection. Preferably, the assembly unit can be 3 or 6, for example, the rotary cover structure embodiment shown in FIGS. 11-18, the assembly unit adopts 6. In addition, the number of assembly units can be no less than 2 and can be evenly divided by 360°, the firmness of the clamping connection between the clamping block and the clamping portion is positively correlated with the number of assembly units, but too many will increase the production cost, therefore, the preferred embodiment of the present application adopts 6 assembly units.

[0162] Please refer to Fig. 13, for example, the sixth embodiment of the screw cap structure for replacing the face shell, the clamping portion 110 comprises a clamping surface 112, and an assembly groove 111 is arranged above the clamping surface 112; the clamping block 210 comprises a clamping surface 211 which abuts against the clamping surface 112, so that the clamping block 210 can be elastically deformed in the axial direction under the guidance of the assembly groove 111, so that the clamping surface 211 can be reliably clamped with the clamping surface 112. Preferably, the assembly guide portion 120 is protrudingly arranged on the outer circumferential surface of the inner screw cap 100, and the side wall of the assembly guide portion 120 extends to the opening end of the inner screw cap; the separation groove 130 is arranged on the side wall of the assembly guide portion 120, and the separation groove 130 extends through the part of the side wall of the assembly guide portion in the axial direction. The separation groove only extends in the axial direction, but does not extend through the thickness direction of the assembly guide portion, so the surface for the first helical surface 121 to slide with the guided portion is still continuous, except that the width of the guiding surface at the position where the separation groove is located is narrowed (in the radial direction of the inner screw cap). Further, as shown in Fig. 13, the separation groove 130 comprises a first groove surface 131 and a second groove surface 132 and a transition slope surface 133 therebetween, the first groove surface 131 intersects with the remaining first helical surface 121 which is not penetrated by the groove, the second groove surface 132 is connected with the first groove surface 131 through the transition slope surface 133 and obliquely intersects with the outer circumferential surface of the inner screw cap 100, the average depth of the first groove surface 131 is generally smaller than the depth of the second groove surface 132, and the second groove surface 132 extends in a radial direction gradually protruding manner from the opening end of the inner screw cap to the bottom direction, but the inclination is very small, and the second groove surface 132 can also extend at a constant diameter (as shown in Fig. 14); in the upward axial direction, the first groove surface 131 is tapered and inclined in the radial direction relative to the outer circumferential surface of the inner screw cap 100, and the transition slope surface is tapered and inclined in the radial direction relative to the outer circumferential surface of the inner screw cap, so that the first groove surface 131 and the transition slope surface 133 form a wedge shape protruding relative to the outer circumferential surface of the inner screw cap 100, so that the first groove surface 131 can guide the clamping block 210 to smoothly elastically recover from the separation groove 130, and the depth of the second groove surface 132 is deep enough to make the clamping block have a significant relaxation feeling when it is rotated to the position of the second groove surface 132 from the clamping portion 110, so that the user can confirm that the clamping block has been rotated to the position of the separation groove. In other embodiments, the separation groove can only comprise the second groove surface and the transition slope surface, that is, the separation groove does not extend to the assembly guide surface in the axial direction, as shown in Fig. 14; the first groove surface can also extend at a constant diameter in the axial direction (as shown in Figs. 15 and 16), or the second groove surface and the first groove surface continuously and gradually protrude (from the opening end of the inner screw cap to the bottom direction, as shown in Fig. 7). These three ways can realize the separation of the face shell and the inner screw cap. However, the first groove surface 131 extends at a constant diameter or is tapered and inclined, which can avoid the problem of excessive thickness of the outer circumferential surface caused by directly gradually protruding the second groove surface 132 from the opening end of the inner screw cap to the bottom, so that the separation effect is smoother.In addition, the depth of the second groove surface 132 is set to be deeper, so that when the card block is rotated from the clamping portion position to the separation groove position, a clear gap release feeling is generated, which facilitates the user to identify that the rotation has reached the position.

[0163] Further, similar to the embodiments shown in FIGS. 7-10, for the fully non-precise positioning clamping cap structure, the exit performance of the separation groove can also be optimized by designing the structure of the two side walls of the separation groove. Referring to FIG. 15, the distal end F of the second side wall L2 of the separation groove 130A is inclined in a direction away from the clamping portion 110 compared to the proximal end N, and the inclination angle and the achieved function can refer to the embodiments shown in FIGS. 7 and 9, which will not be repeated here. As shown in FIG. 16, the opening size of the separation groove 130A near the inner cap bottom is smaller than the opening size near the inner cap opening end, that is, the first side wall L1 and the second side wall L2 of the separation groove 130A are relatively close to the inclination from the proximal ends N1, N2 to the distal ends F1, F2, and the inclination angle and the achieved function can refer to the embodiment shown in FIG. 8, which will not be repeated here. In addition, due to the inclination of the second side wall L2 of the separation groove in the embodiments of FIGS. 15 and 16, the separation groove has a flexible gap setting which is different from the embodiment shown in FIG. 14. In order to increase the overall flexibility of the separation groove, the gap 1002 near the second side wall L2 of the separation groove is closer to the adjacent clamping portion of the assembly unit, so that the segment of the assembly guide portion provided with the separation groove occupies most of the entire assembly guide portion, and there is a radial gap between it and the notch 150 of the inner cap. This structure design makes the card block not mistakenly buckled from the separation groove when the face shell and the inner cap are assembled, but slides to a position opposite the clamping portion and then clamps and connects with the clamping portion, and at the same time, the setting of the separation groove makes it easier for the card block to exit.

[0164] As another object of the present application, the present application also provides a lacing device as shown in Figs. 19-20; comprising a winding drum 500, a housing 400', and a cap structure for facilitating replacement of the face cover as described in any of the above embodiments, wherein the cap structure is rotatably disposed on the housing 400', the winding drum 500 is configured to wind the lacing when rotated in a tightening direction and release the lacing when rotated in a loosening direction; the lacing device has a winding mode in which the inner cap can only be rotated in the tightening direction relative to the housing and cannot be rotated in the loosening direction; the face cover is provided with a clamping block, the inner cap is provided with a split structure, the split structure is provided with a clamping portion and a separation groove, the separation groove is disposed on one side of the clamping portion in the loosening direction. When the lacing device is in the winding mode, since the inner cap is configured to be unable to rotate in the loosening direction relative to the housing, at this time, by applying an external force, the face cover can be rotated in the loosening direction relative to the housing, then the face cover can be rotated in the loosening direction relative to the inner cap, and since the separation groove is disposed on one side of the clamping portion in the loosening direction, when the face cover is rotated in the loosening direction relative to the inner cap, the clamping block on the face cover is rotated from the position of the clamping portion to the position of the separation groove, and then the face cover can be separated from the inner cap. Therefore, when the lacing device is configured to only allow the inner cap to rotate in the tightening direction relative to the housing in the winding mode, in this mode, by applying an external force in the loosening direction to the face cover, the inner cap remains stationary, and the face cover can be rotated in the loosening direction relative to the inner cap, thereby achieving the function of replacing the face cover.

[0165] The strap device provided by the application is provided with a reverse prevention mechanism on the inner rotating cover and the shell. The reverse prevention mechanism allows the strap device to rotate in the tightening direction relative to the shell in the winding strap mode, and cannot rotate in the loosening direction. The tightening direction of the strap device in any of the embodiments shown in Figures 19 and 20 is the clockwise direction, and the loosening direction is the counterclockwise direction (from the perspective of the top view). Specifically, referring to the embodiments shown in Figures 19 and 20, the reverse prevention mechanism adopts a gear tooth-offsettable member 401'-stop member 402' structure, wherein the gear tooth is a first reverse prevention member, the offsettable member 401' is a second reverse prevention member, a plurality of offsettable members 401' form a reverse prevention gear ring 40, the gear tooth (see the ratchet 101 shown in Figure 22) is arranged on the inner rotating cover, and the offsettable member 401' and the stop member 402' are fixedly arranged on the shell 400'. The stop member 402' has a check head for preventing the head of the offsettable member 401' from being offset in the loosening direction, thereby preventing the inner rotating cover and the winding drum from rotating in the loosening direction. The specific structure of the gear tooth-offsettable member-stop member and the reverse prevention mechanism can be referred to in patent CN 202410035435.3. The assembly structure of the offsettable member 401'-stop member 402' in patent CN 202410035435.3 and the shell is shown in Figure 21, which is slightly different from the structure shown in Figures 19 and 20, but the reverse prevention mechanism is exactly the same. Figure 22 shows a schematic view of the inner rotating cover assembled with another reverse prevention mechanism. The reverse prevention mechanism shown in Figure 22 includes a first reverse prevention member-ratchet 101 and a second reverse prevention member-elastic pawl 401. The elastic pawl 401-ratchet 101 mechanism serves as a reverse prevention mechanism, which determines the tightening direction and the loosening direction of the rotating cover structure. Specifically, the arrow in this embodiment points to the tightening direction (counterclockwise direction from the perspective of the bottom view), and the loosening direction is opposite to the tightening direction (clockwise direction from the perspective of the bottom view). Therefore, the tightening direction and the loosening direction of the strap device including any of the reverse prevention mechanisms shown in Figures 19 to 22 are consistent, and the separation groove of any of the rotating cover structures above is located on the side of the loosening direction of the clamping part according to the loosening direction. Therefore, the reverse prevention mechanism above can be used in cooperation with any of the rotating cover structures above which is convenient to replace the face shell. Further, the reverse prevention mechanism in the application is not limited to the gear tooth-offsettable member-stop member structure and the elastic pawl-ratchet mechanism. Any mechanical structure that can achieve the function of preventing reverse rotation is applicable, such as the reverse prevention mechanisms disclosed in patents CN216256587U, CN215837385U, CN 215423119 U, CN221662582U, CN216723374U, and CN208993976U.

[0166] Specifically, the strap device shown in FIG. 19 adopts the screw cap structure shown in FIG. 8, and the strap device shown in FIG. 20 adopts the screw cap structure shown in FIG. 11, which further comprises a decorative piece 300 that is movably connected with the face shell 200, for example, by adhesive connection.

[0167] Alternatively, when the strap device comprises the screw cap structure shown in FIGS. 1-7, the clamping blocks can be directly clamped with the clamping portions, and the assembly of the face shell and the inner screw cap of the strap device with this screw cap structure is a precise clamping alignment. When the strap device comprises the screw cap structure shown in FIGS. 8-10, the clamping blocks can be directly clamped with the clamping portions or can be clamped with the clamping portions 102 after sliding along the unit assembly guide portions 12L or 12R to the position of the clamping portions 102, and the assembly of the face shell and the inner screw cap of the strap device with this screw cap structure is a non-precise clamping alignment, that is, the clamping blocks on the face shell do not need to be precisely aligned with the clamping portions 1011 on the inner screw cap, and the clamping blocks only need to be lowered within the fault-tolerant alignment space that can be radiated by the clamping portions 1011 to be directly or after a certain sliding clamped with the corresponding clamping portions, realizing the assembly of the face shell and the inner screw cap. When the strap device comprises the screw cap structure shown in FIGS. 11-18, and the assembly units composed of the assembly guide portions and the clamping portions are the same, uniform and continuous around the outer periphery of the inner screw cap, and the clamping blocks on the face shell and the clamping portions of the inner screw cap are required to be the same structure, then no matter from which position above the inner screw cap the face shell is buckled down, the clamping blocks will be directly or guided to the alignment position of the clamping portions, and then clamped and connected with the clamping portions. Therefore, this structure design can realize the complete non-precise clamping alignment of the face shell and the inner screw cap, that is, the face shell can be 360° omnidirectionally dropped and buckled and assembled to the inner screw cap, without the need for prior alignment or foolproof design, simplifying the assembly process of the face shell and the inner screw cap; of course, for the structure of multiple clamping blocks, such as the case where the size or shape is different, a certain clamping block can only be clamped with a specific clamping portion, at this time, the face shell and the inner screw cap also belong to the type of non-precise clamping alignment. In terms of buckling operation, specifically, since the equal rotation direction of the assembly guide portion is opposite to the tightening direction, when an external buckling force is applied to the face shell, the inner screw cap rotates in the tightening direction while the guide portion slides along the assembly guide portion, and the face shell moves axially until the clamping blocks are clamped and connected with the clamping portions.

[0168] Therefore, since the separation groove and the clamping part are staggered along the circumference of the inner rotary cover and located on the side of the clamping part in the loosening direction, the face shell and the inner rotary cover can be quickly separated by rotating the face shell in the loosening direction and by means of the separation groove in the winding mode of the lacing device. The separation groove is arranged so that the separation of the face shell and the inner rotary cover can be achieved without the aid of tools. On the other hand, through the design of the assembly unit in the split and combination structure, the face shell and the inner rotary cover can be precisely positioned and clamped, non-precisely positioned and clamped, and completely non-precisely positioned and clamped, so that the disassembly and assembly operations of the face shell in the rotary cover structure provided by the application are optimized. Without special tools and skills, users can replace the face shell they want at will, meeting the needs of users for the diversity of the appearance of the lacing device.

[0169] Further, when the face shell is rotated in the loosening direction of the lacing device and quickly separated from the inner rotary cover by means of the separation groove, the face shell will displace the check member in the axial direction due to uneven stress, causing the structure of the check member to be damaged. In order to prevent the structure of the check member from being damaged when the face shell is rotated in the loosening direction, a limiting part is further arranged on the inner rotary cover or the shell body to limit the axial displacement of the check member, thereby ensuring the reliable stability and durability of the structure. Referring to FIG. 21, the side wall of the check head of the check member 402' in the patent CN 202410035435.3 is parallel to the axial direction L of the inner rotary cover, so the check head can only prevent the head of the deflectable member 401' from deflecting in the loosening direction, but cannot limit the axial displacement of the head of the deflectable member. When the face shell is rotated in the loosening direction to separate it from the inner rotary cover, since the deflectable member 401' is engaged with the ratchet (or groove) on the inner rotary cover, the face shell is subjected to uneven external force, causing friction on the engagement surface, and the friction on the engagement surface causes the deflectable member to be lifted, thereby causing the structure of the second check member to be damaged. In order to avoid the damage of the deflectable member due to lifting, as shown in FIGS. 23 to 25, the check head of the check member 402' in the present patent is configured as a check limiting part 403, and the main projection line L3 of the side wall of the check limiting part 403 is inclined relative to the axial direction L of the inner rotary cover at an acute angle; correspondingly, the neck joint part of the deflectable member 401' is configured as a neck joint protrusion 404, and the main projection line L4 of the side wall of the neck joint protrusion 404 is also arranged to be inclined relative to the axial direction L of the inner rotary cover.

[0170] The check limiting part 403 and the neck joint protrusion 404 of the deflectable member form a force lock in the axial direction. As shown in FIG. 26, when the face shell is subjected to uneven external force causing the ratchet to move upward, the friction between the ratchet and the engagement surface of the deflectable member causes the deflectable member to move upward, and when the neck joint protrusion 404 of the deflectable member 401' is subjected to upward friction and tends to produce axial upward displacement, the check limiting part 403 of the check member exerts a force F 压The force F 压 The vertical downward force F1 is used to balance the upward friction force that the engaging teeth of the deflectable member are subjected to, so as to limit the upward displacement of the neck protrusion 404 (i.e. the deflectable member) along the axial direction L, thereby avoiding the structural damage of the deflectable member due to upward deflection.

[0171] In other embodiments of the anti-reverse mechanism, the second anti-reverse member is not limited to the elastic pawl and the deflectable member as described above, and any member that has strong deformation ability or is likely to be deflected during use can constitute the second anti-reverse member, such as a pawl, a deflectable member, a swing arm, or a latch, etc. Based on the fact that the second anti-reverse member is likely to be deflected and damaged when subjected to an upward external force, a limiting portion can be provided on the shell or the inner rotating cover where the pawl or the deflectable member is located. The function of the limiting portion is to limit the axial displacement of the pawl or the deflectable member relative to the shell or the inner rotating cover. For example, in the lacing device embodiment shown in FIG. 20, the deflectable member 401' is fixed to the shell 400'. When the shell is rotated relative to the inner rotating cover in the loosening direction, the deflectable member 401' is likely to be driven upward by the pawl on the inner rotating cover due to friction, which can cause damage to the deflectable member 401'. Therefore, the function of the limiting portion is to limit the axial displacement of the deflectable member 401' relative to the shell 400', so that the deflectable member 401', especially the engaging head of the deflectable member 401', can always be close to the upper surface of the shell 400' and will not be driven upward, thereby avoiding structural damage. Similarly, if the deflectable member is provided on the inner rotating cover, the function of the limiting portion is to limit the deflectable member from being driven downward due to friction, thereby avoiding structural damage.

[0172] Further, the structure of the limiting portion is not limited to the structure shown in FIG. 23. The check limiting portion shown in FIG. 23 has the functions of anti-reverse rotation and limiting the axial displacement of the deflectable member, and is multifunctional, which is beneficial to simplify the structure of the lacing device. However, in other embodiments, the limiting portion can limit the axial displacement of the second anti-reverse member in a shape-locked manner, such as an independent transverse tab or other structures, as long as it can limit the axial displacement of the anti-reverse mechanism relative to the inner rotating cover or the shell.

[0173] Further, to prevent the anti-reverse member from being damaged due to being lifted up when the reverse rotating face shell is separated from the inner rotating cap, in addition to the setting of the limiting portion, the exit channel of the clamping block can also be optimized. For example, in the rotating cap structures of FIGS. 7, 9, and 15, the second side wall L2 of the separation groove is inclined, the distal end F, F2 of the second side wall L2 is inclined in the direction away from the clamping portion compared to the proximal end N, N2, and the tightening direction and loosening direction of the lacing device are combined, that is, the distal end F, F2 of the second side wall L2 of the separation groove is inclined in the loosening direction of the lacing device compared to the proximal end N, N2, the second side wall L2 of the separation groove can be provided as an inclined surface or a spiral surface, so that when the clamping block is rotated from the clamping portion to the separation groove by rotating the face shell in the loosening direction, even if the rotation force in the loosening direction is not immediately stopped, the clamping block will slide out along the second side wall L2 of the separation groove. For the conventional separation groove, for example, when the second side wall L2 of the separation groove is parallel to the axis of the inner rotating cap, when the external force in the loosening direction causes the clamping block to rotate from the clamping portion to the separation groove, the external force in the loosening direction is still applied after the clamping block reaches the separation groove, the continuously applied external force increases the friction between the deflectable member or the elastic pawl head and the ratchet teeth on the inner rotating cap, and when the face shell is separated by applying an axial upward pulling force, the instantaneously increased friction will cause the anti-reverse member to be damaged due to being lifted up. Further preferably, the first side wall L1 of the separation groove is provided to be inclined from the proximal end L1 to the distal end F1 in the tightening direction of the lacing device, as shown in FIGS. 9 and 10, when the clamping block reaches the separation groove by rotating the face shell in the loosening direction, the clamping block can be caused to slide out along the first side wall L1 of the separation groove by applying an external force in the tightening direction to the face shell, and since the external force in the tightening direction applied to the inner rotating cap will not cause the anti-reverse member to be lifted up, this structural design of the first side wall L1 can also avoid structural damage to the anti-reverse member.

[0174] Of course, the lacing device applied to the rotating cap structure provided by the present application is not limited to the embodiments shown in FIGS. 19 and 20, and the tightening direction of the lacing device is not limited to the clockwise direction. Even if the tightening direction is inconsistent, the principle of the rotating cap structure facilitating the replacement of the face shell to achieve its function is consistent, and the corresponding structure can be transformed according to the actual application requirements, and ultimately the same function and effect can be achieved. That is, when the face shell and the inner rotating cap need to be separated, the direction in which the face shell is rotated relative to the inner rotating cap only needs to be consistent with the anti-reverse direction of the lacing device, and correspondingly, the separation groove needs to be located on the side of the anti-reverse direction relative to the clamping portion, so that in the winding lacing mode, the inner rotating cap remains stationary and the face shell can rotate relative to the inner rotating cap, thereby achieving the purpose of separating the face shell from the inner rotating cap, and the anti-reverse direction is not limited to the counterclockwise direction (as viewed from the top) shown in FIGS. 19 to 22, the clockwise direction can also be used, as long as the anti-reverse mechanism and the opening and closing structure are adaptively designed.

[0175] The above is for the case that the clamping block is arranged on the face shell and the split and combination structure is arranged on the inner rotary cover. In other preferred embodiments, the clamping block can also be arranged on the inner rotary cover and the split and combination structure is arranged on the face shell, which does not affect the function of the face shell being separated from the inner rotary cover by rotation.

[0176] The lacing device can be used to tighten articles, and the articles to be tightened can be shoes, clothes, hats, bags, various bags, etc. The lacing device can be used in combination with other components such as a lacing guide to tighten the lacing to close the opening. The lacing device can obtain the beneficial effects brought by any convenient rotary cover structure for replacing the face shell, which will not be described here. Therefore, the assembly of the face shell and the inner rotary cover of the lacing device is fast and accurate, and the user can conveniently replace the face shell relative to the inner rotary cover according to the appearance preference. The lacing device of the embodiment further includes a base member 600 for fixing the lacing device body on the article to be tightened.

[0177] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled person in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0178] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields under the inventive concept of the present application is included in the patent protection scope of the present application.

Claims

1. A screw cap structure facilitating replacement of a face shell, comprising an inner screw cap and a face shell which is detachably mounted on the outer side of the inner screw cap, characterized in that, The face shell is provided with a clamping block, and the inner rotary cover is provided with a split structure, and the clamping block and the split structure are matched to realize clamping and separation of the inner rotary cover and the face shell. The split structure includes a clamping portion and a separation groove, the clamping block is clamped and connected with the clamping portion to link the face shell and the inner rotary cover, and the face shell can rotate relative to the inner rotary cover to rotate the clamping block to the separation groove and separate the face shell and the inner rotary cover through the separation groove.

2. The spin-on cap structure with a replaceable face shell of claim 1, wherein, The split structure is arranged along the outer circumferential surface of the inner rotary cover, and the separation groove and the clamping portion are staggered along the circumference of the inner rotary cover.

3. The spin-on cap structure of claim 2, wherein, The split structure further includes a rotating transition portion arranged between the clamping portion and the separation groove to guide the clamping block to rotate and transition to the separation groove.

4. The spin-on cap structure of claim 1, wherein, The split structure further includes an assembly guide portion, the clamping block can be directly clamped and connected with the clamping portion at an aligned position of the clamping portion, or the clamping block is moved to the aligned position of the clamping portion from a misaligned position at least partially staggered with the clamping portion under the action of the assembly guide portion, and then the clamping block is clamped and connected with the clamping portion.

5. The spin-on cap structure of claim 1, wherein, The split structure further includes an assembly guide portion inclined relative to the rotation axis direction of the inner rotary cover, the assembly guide portion has a proximal end close to the bottom of the inner rotary cover and an opposite distal end, and the aligned position of the clamping portion is adjacent to the distal end of the assembly guide portion. The clamping block can be moved to the aligned position of the clamping portion under the action of the assembly guide portion, and then the clamping block is clamped and connected with the clamping portion.

6. The spin-on cap structure of claim 4 or 5, wherein, The clamping portion corresponds to an assembly guide pair including two unit assembly guide portions, the clamping block can be moved to the aligned position of the clamping portion under the action of any unit assembly guide portion, and each unit assembly guide portion has a proximal end close to the bottom of the inner rotary cover and an opposite distal end, and the aligned position of the clamping portion is adjacent to the distal end of each unit assembly guide portion in the assembly guide pair.

7. The spin-on cap structure of claim 4 or 5, wherein, The face shell is provided with a guided portion matched with the assembly guide portion, the clamping block can be moved to the aligned position of the clamping portion under the cooperation of the assembly guide portion and the guided portion, and then the clamping block is clamped and connected with the clamping portion.

8. The spin-on cap structure of claim 7, wherein, The guided portion and the clamping block are an integral structure, the clamping block includes a clamping surface abutting the clamping portion, and the guided portion is arranged on the opposite side of the clamping surface, the clamping block can be moved to the aligned position of the clamping portion along the assembly guide portion, and then the clamping block is clamped and connected with the clamping portion.

9. The spin-on cap structure of claim 7, wherein, The matching surfaces of the assembly guide portion and the guided portion are constructed as helical surfaces, inclined surfaces or special-shaped surfaces, and the special-shaped surfaces are different helical surfaces, different inclined surfaces or combinations of helical surfaces and inclined surfaces.

10. The spin-on cap structure of claim 1, wherein, The side wall of the face shell is provided with a gap, and at least one side of the clamping block is adjacent to the gap.

11. The spin-on cap structure of claim 4 or 5, wherein, The assembly guide and the clamping part constitute an assembly unit, and the split and combination structure is provided with a plurality of assembly units, each of which comprises at least one assembly unit and one separation groove, and a plurality of assembly units are arranged continuously and adjacently around the outer circumferential surface of the inner rotary cover.

12. The spin-on cap structure of claim 11, wherein, The outer circumferential surface of the inner rotary cover is provided with a plurality of notches corresponding to the number of separation grooves, and the separation grooves and the notches have a gap therebetween.

13. The spin-on cap structure of claim 1, wherein, The separation groove comprises a first side wall close to the clamping part and an opposite second side wall, wherein the first side wall and the second side wall each have a proximal end close to the opening end of the inner rotary cover and an opposite distal end; the distal end of the second side wall is configured to be inclined toward the side away from the clamping part in the circumferential direction compared with the proximal end, and / or the distal end of the first side wall is configured to be inclined toward the side close to the clamping part in the circumferential direction compared with the proximal end, so as to guide the clamping block to slide out smoothly.

14. The spin-on cap structure of claim 1, wherein, The split and combination structure is provided with a plurality of split and combination structures respectively, and the clamping block is also provided with a plurality of clamping blocks respectively.

15. The easy-to-replace-face structure of the screw cap according to any one of claims 1 to 14, wherein The face shell is integrally formed with a decorative structure; or the rotary cover structure facilitating replacement of the face shell further comprises a decorative piece, and the decorative piece is linkably connected with the face shell.

16. A spin cap structure facilitating replacement of a face shell, comprising an inner spin cap and a face shell detachably mounted on the outer side of the inner spin cap, characterized in that, The inner rotary cover is provided with a clamping block, and the face shell is provided with a split and combination structure, and the clamping block and the split and combination structure cooperate to realize clamping and separation of the inner rotary cover and the face shell. The split and combination structure comprises a clamping part and a separation groove, the clamping block and the clamping part are clamped and connected to linkably connect the face shell and the inner rotary cover; the face shell can also rotate relative to the inner rotary cover to rotate the split and combination structure relative to the clamping block to the separation groove, and separate the face shell and the inner rotary cover through the separation groove.

17. A lacing device, comprising: The rotary cover structure facilitating replacement of the face shell comprises a shell and the rotary cover structure facilitating replacement of the face shell according to any one of claims 1-15, wherein the rotary cover structure facilitating replacement of the face shell is rotatably arranged on the shell.

18. The lacing device of claim 17, having a take-up lacing mode and a let-out lacing mode; wherein, In the winding lacing mode, the inner rotary cover of the rotary cover structure is configured to be rotatable relative to the shell in the tightening direction and not rotatable relative to the shell in the loosening direction, and the face shell is rotatable relative to the inner rotary cover in the loosening direction.

19. The lacing device of claim 18, wherein, The separation groove and the clamping part are staggered in the circumferential direction of the inner rotary cover and located on the side of the clamping part in the loosening direction.

20. The lacing device of claim 19, wherein, The separation groove comprises a first side wall close to the clamping part and an opposite second side wall, wherein the first side wall and the second side wall each have a proximal end close to the opening end of the inner rotary cover and an opposite distal end; the distal end of the second side wall is configured to be inclined toward the side in the loosening direction compared with the proximal end, and / or the distal end of the first side wall is configured to be inclined toward the side in the tightening direction compared with the proximal end, so as to guide the clamping block to slide out smoothly.

21. The lacing device of claim 18, wherein, The split and combination structure further comprises an assembly guide, the face shell is provided with a guided part matched with the assembly guide, the clamping block can move to the aligned position of the clamping part under the cooperation of the assembly guide and the guided part, and then the clamping block and the clamping part are clamped and connected; the assembly guide has a single equivalent rotation direction, and the equivalent rotation direction is opposite to the tightening direction.

22. The lacing device of claim 18, wherein, The lacing device further comprises a reverse-stopping mechanism, so that the inner rotating cover can only rotate relative to the shell in the tightening direction in the lacing mode; the reverse-stopping mechanism comprises a first reverse-stopping member and a second reverse-stopping member which are matched with each other, and the first reverse-stopping member is a ratchet or a groove; the lacing device further comprises a limiting part for limiting axial displacement of the second reverse-stopping member.

23. The lacing device of claim 22, wherein, The limiting part and the second reverse-stopping member are arranged on the same component of the lacing device, and force locking or shape locking is formed between the limiting part and the second reverse-stopping member to limit axial displacement of the second reverse-stopping member.

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