CN108939450B

CN108939450B - Wrist strength exerciser with hand massage function

Info

Publication number: CN108939450B
Application number: CN201810670199.7A
Authority: CN
Inventors: 李新泉; 陈永刚; 其他发明人请求不公开姓名
Original assignee: Individual
Current assignee: Chen Yonggang; Li Xinquan
Priority date: 2018-06-26
Filing date: 2018-06-26
Publication date: 2020-03-31
Anticipated expiration: 2038-06-26
Also published as: CN108939450A

Abstract

The invention discloses a wrist strength exerciser with a hand massage function, which comprises a support sleeve, wherein a handle is arranged on the lower end surface of the support sleeve, a pin shaft is arranged on the lower end surface of the support sleeve, a plurality of massage wheels distributed along the length direction of the pin shaft are rotatably sleeved on the pin shaft, a plurality of massage convex ribs distributed circumferentially are arranged on the peripheral wall of each massage wheel, a clamp spring for preventing the massage wheels from being separated from the pin shaft is clamped at the lower end of the pin shaft, and the cross section of each massage convex rib is of a ladder-shaped structure with a large inside and a small outside; the massage wheel is arranged, so that when the palm or the back of the hand of an exerciser rubs with the peripheral wall of the massage wheel back and forth, the hand can be massaged.

Description

Wrist strength exerciser with hand massage function

Technical Field

The invention belongs to the technical field of wrist strength exercise devices, and relates to a wrist strength exercise device with a hand massage function.

Background

In order to achieve the purpose of exercising the wrist force of the hands, a wrist force exerciser appears on the market at present, but the existing wrist force exerciser only can exercise the wrist force and cannot massage the hands when in use, so that the wrist force exerciser has the defect of single function.

Disclosure of Invention

In order to solve the problems, the invention designs the wrist strength exerciser with the hand massage function, which can massage the hands when the palm or the back of the hands of an exerciser rub against the peripheral wall of the massage wheel back and forth through the arrangement of the massage wheel.

The purpose of the invention is realized as follows:

the wrist strength exerciser with the hand massage function comprises a support sleeve, wherein a handle is arranged on the lower end face of the support sleeve, a pin shaft is arranged on the lower end face of the support sleeve, a plurality of massage wheels distributed along the length direction of the pin shaft are rotatably sleeved on the pin shaft, a plurality of massage convex ribs distributed circumferentially are arranged on the outer circumferential wall of each massage wheel, a clamp spring used for preventing the massage wheels from being separated from the pin shaft is clamped at the lower end of the pin shaft, and the cross section of each massage convex rib is of a ladder-shaped structure with a large inside and a small outside.

The invention relates to a wrist strength exerciser with a hand massage function, wherein a left end surface of a support sleeve is provided with an assembly hole, the opening end of the assembly hole is in threaded connection with an end cover, a rotating plate is rotatably connected in the assembly hole positioned on the inner side of the end cover, the edge of the end surface of the rotating plate, which faces one side of the end cover, is provided with a rotating rod, an arc-shaped groove for the rotating rod to slide when the rotating plate rotates is arranged in the end cover, the middle part of the end surface of the rotating plate, which faces one side of the end cover, is provided with a rotating shaft which is rotatably penetrated in the end cover, the rotating shaft movably penetrates through the end cover and is sleeved with a first anti-skidding sleeve, the outer wall of the first anti-skidding sleeve is provided with a first anti-skidding bulge, a rotating block is rotatably connected on the inner bottom part of the assembly hole, a support shaft, a torsion spring is arranged between the rotating plate and the rotating block, one end of the torsion spring is fixed with the rotating plate, the other end of the torsion spring is fixed with the rotating block, an adjusting mechanism for driving the rotating block to rotate so as to adjust the torsion of the torsion spring to the rotating plate is arranged between the rotating block and the supporting sleeve, and a locking mechanism for locking the rotating block after the rotating block rotates is arranged between the rotating block and the supporting sleeve; after adopting this kind of structure, have the advantage that pivot torsion can be adjusted, so, can adapt to the user of different demands, have the advantage that application scope is wide.

The invention relates to a wrist strength exerciser with a hand massage function, wherein an adjusting mechanism comprises an adjusting hole which is arranged on the side wall of a supporting sleeve and communicated with an assembling hole, the outer end part of the adjusting hole is in threaded connection with a first sealing cover, a rotating pin is rotatably penetrated in the first sealing cover, a bevel gear is arranged at the inner end part of the rotating pin, a movable rod at the outer end part of the rotating pin penetrates through the first sealing cover and then extends out of the first sealing cover, a rotating handle is welded outside the first sealing cover, an annular bevel gear surface used for being meshed with the bevel gear is arranged on the end surface of a rotating block facing one side of the bevel gear, a first spring used for pushing the bevel gear to be meshed with the bevel gear surface is sleeved outside the rotating pin between the first sealing cover and the bevel gear, a positioning pin partially inserted into the bevel gear is arranged on the outer wall of a supporting shaft, and the; by adopting the structure, when the rotating handle rotates, the rotating handle can drive the bevel gear to rotate, and the bevel gear is meshed with the bevel gear, so that the bevel gear can drive the rotating block to rotate, and after the rotating block rotates, the acting force of the torsion spring on the rotating plate can be adjusted, namely the torsion of the torsion spring on the rotating plate can be adjusted.

The wrist strength exerciser with the hand massage function comprises a locking mechanism, a sliding way, a second sealing cover, a sliding rod, a limiting block, a pull ring, a plurality of clamping grooves for the limiting block to be clamped in, and a second spring, wherein the sliding way is arranged on the side wall of a supporting sleeve and communicated with an assembling hole; by adopting the structure, the rotating block can realize reliable locking of the rotating disc after rotating from bottom to top.

The wrist strength exerciser with the hand massage function is characterized in that a first guide inclined plane is arranged on the front end face of the lower end of the limiting block, and a second guide inclined plane which can be matched with the first guide inclined plane for guiding is arranged in the clamping groove; after adopting this kind of structure, after the turning block rotated by supreme down, the stopper can be gone into each draw-in groove in proper order automatically, and when the turning block rotated from top to bottom, the turning block then can be locked and unable pivoted phenomenon appears.

The wrist strength exerciser with the hand massage function comprises an anti-falling structure, a rotating block and a supporting shaft, wherein the anti-falling structure comprises a retaining ring which is sleeved outside the supporting shaft and used for abutting against the rotating block; by adopting the structure, the phenomenon that the rotating block is separated from the supporting shaft can be avoided.

The wrist strength exerciser with the hand massage function is characterized in that the outer wall of the elastic sheet is provided with a convex edge which is used for abutting against the outer side wall of the supporting shaft; through the setting of chimb, the shell fragment can compress tightly on the lateral wall of back shaft better, and the shell fragment can be better with annular caulking groove cooperation chucking.

The wrist force exerciser with the hand massage function is characterized in that the end face, located on one side of the retainer ring, of the support shaft is provided with an annular guide surface which can be matched with the elastic sheet for guiding so as to facilitate the end part of the elastic sheet to be embedded into the annular caulking groove; through the setting of annular spigot surface, the shell fragment can lead in order to make things convenient for the shell fragment to imbed in the annular caulking groove with annular spigot surface cooperation.

The wrist strength exerciser with the hand massage function is characterized in that a bearing is mounted on the outer peripheral wall of a rotating plate, the outer peripheral wall of the rotating plate is fixed with an inner ring of the bearing, an annular step for embedding the bearing is arranged on the inner side wall of the opening end of an assembling hole, an annular boss is arranged on the inner end face of an end cover and is in threaded connection with the annular step, and the annular boss is tightly pressed on the outer ring of the bearing; by adopting the structure, the rotating plate can be reliably and rotatably connected with the supporting sleeve, and the end cover can be reliably connected with the supporting sleeve.

The wrist strength exerciser with the hand massage function is characterized in that a tension spring is arranged on the right end face of a support sleeve, one end, away from the support sleeve, of the tension spring is provided with a U-shaped bending section which can be held by a hand, the bending section is welded with the outer end part of the tension spring after being bent, a second anti-slip sleeve wraps the outer part of the vertical part of the bending section, and a plurality of second anti-slip bulges are arranged on the outer wall of the second anti-slip sleeve; through the arrangement of the tension spring, when one hand holds the handle and the other hand pulls the bending section, the tensile force of the arm can be exercised, namely the arm strength can be exercised, so that the practicability of the invention can be improved.

The massage wheel is arranged, so that when the palm or the back of the hand of an exerciser rubs with the peripheral wall of the massage wheel back and forth, the hand can be massaged.

Drawings

FIG. 1 is a schematic view, partly in section, of the present invention;

FIG. 2 is a left side view schematic of the end cap;

FIG. 3 is a left side view of the rotating plate;

FIG. 4 is a left side view of the rotating block and the locking mechanism after being locked;

fig. 5 is an enlarged schematic view of a portion a in fig. 1.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", and the like, indicate orientations or state relationships based on the orientations or state relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that a referred mechanism or component must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A wrist strength exerciser with hand massage function comprises a supporting sleeve 1, a handle 11 is arranged on the lower end face of the supporting sleeve 1, an assembly hole 12 is arranged on the left end face of the supporting sleeve 1, an end cover 2 is in threaded connection with the opening end of the assembly hole 12, a rotating plate 3 is rotatably connected in the assembly hole 12 on the inner side of the end cover 2, a rotating rod 31 is arranged at the edge of the end face of the rotating plate 3 facing one side of the end cover 2, an arc-shaped groove 21 for the rotating rod 31 to slide when the rotating plate 3 rotates is arranged in the end cover 2, a rotating shaft 32 rotatably penetrating in the end cover 2 is arranged in the middle of the end face of the rotating plate 3 facing one side of the end cover 2, a first anti-skid sleeve 33 is sleeved after the rotating shaft 32 movably penetrates through the end cover 2, a first anti-skid protrusion 34 is arranged on the outer wall of the first anti-skid sleeve 33, a rotating block 4 is rotatably connected on the inner bottom of the assembly hole 12, a supporting, an anti-disengaging structure for preventing the rotating block 4 from disengaging from the supporting shaft 13 is arranged between the rotating block 4 and the supporting shaft 13, a torsion spring 5 is arranged between the rotating plate 3 and the rotating block 4, one end of the torsion spring 5 is fixed with the rotating plate 3, the other end of the torsion spring is fixed with the rotating block 4, an adjusting mechanism for driving the rotating block 4 to rotate so as to adjust the torsion of the torsion spring 5 on the rotating plate 3 is arranged between the rotating block 4 and the supporting sleeve 1, and a locking mechanism for locking the rotating block 4 after the rotating block 4 rotates is arranged between the rotating block 4 and the supporting sleeve 1; the adjusting mechanism comprises an adjusting hole 14 which is arranged on the side wall of the supporting sleeve 1 and communicated with the assembling hole 12, a first sealing cover 61 is connected with the outer end part of the adjusting hole 14 in a threaded manner, a rotating pin 64 is rotatably arranged in the first sealing cover 61 in a penetrating manner, a bevel gear 62 is arranged at the inner end part of the rotating pin 64, a movable rod at the outer end part of the rotating pin 64 penetrates through the first sealing cover 61 and then extends out of the first sealing cover 61 and is welded with a rotating handle 63, an annular bevel gear surface 41 used for being meshed with the bevel gear 62 is arranged on the end surface of the rotating block 4 facing one side of the bevel gear 62, a first spring 65 used for pushing the bevel gear 62 to be meshed with the bevel gear surface 41 is sleeved outside the rotating pin 64 between the first sealing cover 61 and the bevel gear 62, a positioning pin 15 which is partially inserted into the bevel gear 62 is arranged on the outer wall of the supporting shaft 13, and; by adopting the structure, when the rotating handle rotates, the rotating handle can drive the bevel gear to rotate, and the bevel gear is meshed with the bevel gear, so that the bevel gear can drive the rotating block to rotate, and after the rotating block rotates, the acting force of the torsion spring on the rotating plate can be adjusted, namely the torsion of the torsion spring on the rotating plate can be adjusted; the locking mechanism comprises a slide way 16 which is arranged on the side wall of the support sleeve 1 and communicated with the assembling hole 12, a second sealing cover 71 is connected to the outer end face of the slide way 16 in a threaded manner, a slide rod 72 is movably arranged in the second sealing cover 71 in a penetrating manner, a limiting block 73 is connected to the inner end part of the slide rod 72 in a threaded manner, a pull ring 74 is arranged at the outer end part of the slide rod 72, a plurality of clamping grooves 42 into which the limiting block 73 can be clamped are arranged on the outer peripheral wall of the rotating block 4, and a second spring 75 which is used for pushing the limiting block 73 to clamp the limiting block 73 is sleeved outside the slide rod 72 between the second sealing cover 71; by adopting the structure, the rotating disc can be reliably locked after the rotating block rotates from bottom to top; a first guide inclined plane 76 is arranged on the front end face of the lower end of the limiting block 73, and a second guide inclined plane 43 which can be matched with the first guide inclined plane 76 for guiding is arranged in the clamping groove 42; by adopting the structure, after the rotating block rotates from bottom to top, the limiting blocks can be automatically and sequentially clamped into the clamping grooves, and when the rotating block rotates from top to bottom, the rotating block can be locked and cannot rotate; the anti-falling structure comprises a retaining ring 81 which is sleeved outside the supporting shaft 13 and used for abutting against the rotating block 4, a plurality of elastic sheets 82 which are distributed in the circumferential direction are arranged on the inner circumferential wall of the retaining ring 81, and an annular embedding groove 17 for embedding the end part of the elastic sheet 82 is arranged on the outer circumferential wall of the supporting shaft 13; by adopting the structure, the phenomenon that the rotating block is separated from the supporting shaft can be avoided; the outer wall of the elastic sheet 82 is provided with a convex edge 83 which is used for abutting against the outer side wall of the support shaft 13; through the arrangement of the convex edge, the elastic sheet can be better pressed on the outer side wall of the supporting shaft, and the elastic sheet can be better matched and clamped with the annular caulking groove; the end face of the support shaft 13 on one side of the retainer ring 81 is provided with an annular guide surface 18 which can be matched with the elastic sheet 82 for guiding so as to facilitate the end part of the elastic sheet 82 to be embedded into the annular embedding groove 17; through the arrangement of the annular guide surface, the elastic sheet can be matched with the annular guide surface for guiding so as to be conveniently embedded into the annular embedding groove; a bearing 35 is installed on the outer peripheral wall of the rotating plate 3, the outer peripheral wall of the rotating plate 3 is fixed with an inner ring of the bearing 35, an annular step 19 for embedding the bearing 35 is arranged on the inner side wall of the opening end of the assembling hole 12, an annular boss 22 is arranged on the inner end face of the end cover 2, the annular boss 22 is in threaded connection with the annular step 19, and the annular boss 22 is tightly pressed on an outer ring of the bearing 35; by adopting the structure, the rotating plate can be reliably and rotatably connected with the supporting sleeve, and the end cover can be reliably connected with the supporting sleeve; a tension spring 9 is arranged on the right end face of the support sleeve 1, a U-shaped bending section 91 which can be held by hand is arranged at one end of the tension spring 9, which is far away from the support sleeve 1, the bending section 91 is welded with the outer end part of the tension spring 9 after being bent, a second anti-skid sleeve 92 wraps the outer part of the vertical part of the bending section 91, and a plurality of second anti-skid protrusions 93 are arranged on the outer wall of the second anti-skid sleeve 92; through the arrangement of the tension spring, when one hand holds the handle and the other hand pulls the bending section, the tension of the arm can be exercised, namely the arm strength can be exercised, so that the practicability of the invention can be improved; the lower end face of the support sleeve 1 is provided with a pin shaft 10, the pin shaft 10 is rotatably sleeved with a plurality of massage wheels 101 distributed along the length direction of the pin shaft 10, the outer peripheral wall of each massage wheel 101 is provided with a plurality of massage convex ribs 102 distributed circumferentially, and the lower end of the pin shaft 10 is clamped with a clamp spring 103 for preventing the massage wheel 101 from separating from the pin shaft 10; through the arrangement of the massage wheels, when one hand holds the handle and the palm or the back of the hand of the other hand rubs with the outer peripheral wall of the massage wheel back and forth, the hand can be massaged, so that the practicability of the massage wheel is improved; the cross section of the massage convex rib 102 is in a ladder-shaped structure with a large inside and a small outside; by adopting such a structure, the massage effect on the hands can be improved.

When the hand grip is used, the right hand holds the grip, the left hand holds the first anti-slip sleeve outside the rotating shaft, then the rotating shaft is rotated from top to bottom by the left hand, after the rotating shaft is rotated, the rotating rod slides in the arc-shaped groove, the torsion spring is screwed, the torsion spring can apply torsion to the hand, and when a user rotates the rotating shaft back and forth, the hand wrist strength can be exercised; when the torsion of the torsion spring to the rotating plate needs to be adjusted, the rotating handle is rotated from left to right, after the rotating handle rotates, the rotating handle drives the bevel gear to rotate from left to right, the bevel gear drives the rotating block to rotate from bottom to top, and after the rotating block rotates from bottom to top, the torsion spring is gradually tensioned, so that the torsion applied by the torsion spring to the rotating plate is gradually increased, the exercise intensity of the rotating shaft to the wrist force of a user can be increased when the rotating shaft is rotated from bottom to top by the hand of the user, and in the adjusting process, when the rotating handle is released by the hand, the rotating block can be locked by the locking mechanism; when the torsion of the torsion spring on the rotating plate needs to be adjusted to the initial state, the pull ring is pulled, the limiting block is separated from the clamping groove, then the rotating handle is rotated from right to left, the rotating handle drives the bevel gear to rotate from right to left, the bevel gear drives the rotating block to rotate from top to bottom, and at the moment, the acting force of the torsion spring on the rotating plate can be gradually restored to the initial state.

It should be noted that, in the above embodiments, as long as the technical solutions can be aligned and combined without contradiction, those skilled in the art can exhaust all possibilities according to the mathematical knowledge of the alignment and combination, and therefore, the invention does not describe the technical solutions after alignment and combination one by one, but it should be understood that the technical solutions after alignment and combination have been disclosed by the invention.

It should be noted that the above list is only one specific embodiment of the present invention. It is obvious that the invention is not limited to the above embodiments, but that many variations are possible.

In general, all modifications that can be derived or suggested by those skilled in the art from the disclosure herein are intended to be included within the scope of the invention.

Claims

1. The utility model provides a wrist strength exerciser with hand massage function which characterized in that: the massage device comprises a support sleeve (1), wherein a handle (11) is arranged on the lower end face of the support sleeve (1), a pin shaft (10) is arranged on the lower end face of the support sleeve (1), a plurality of massage wheels (101) distributed along the length direction of the pin shaft (10) are rotatably sleeved on the pin shaft (10), a plurality of massage convex ribs (102) distributed circumferentially are arranged on the peripheral wall of each massage wheel (101), a clamp spring (103) used for preventing the massage wheels (101) from being separated from the pin shaft (10) is clamped at the lower end of the pin shaft (10), and the cross section of each massage convex rib (102) is of a ladder-shaped structure with a large inside and a small outside; the left end face of the support sleeve (1) is provided with a pilot hole (12), the open end of the pilot hole (12) is in threaded connection with an end cover (2), the pilot hole (12) positioned on the inner side of the end cover (2) is rotatably connected with a rotating plate (3), the edge of the end face of the rotating plate (3) facing one side of the end cover (2) is provided with a rotating rod (31), the end cover (2) is provided with an arc-shaped groove (21) for the rotating rod (31) to slide when the rotating plate (3) rotates, the middle part of the end face of the rotating plate (3) facing one side of the end cover (2) is provided with a rotating shaft (32) rotatably arranged in the end cover (2), the rotating shaft (32) movably penetrates through the end cover (2) and is sleeved with a first anti-slip sleeve (33), the outer wall of the first anti-slip bulge (34) is arranged on the outer wall of the first anti-slip sleeve (33), and the, the inner bottom of the assembly hole (12) is provided with a support shaft (13) movably penetrating through the rotating block (4), an anti-falling structure for preventing the rotating block (4) from being separated from the support shaft (13) is arranged between the rotating block (4) and the support shaft (13), a torsion spring (5) is arranged between the rotating plate (3) and the rotating block (4), one end of the torsion spring (5) is fixed with the rotating plate (3), the other end of the torsion spring is fixed with the rotating block (4), an adjusting mechanism for driving the rotating block (4) to rotate so as to adjust the torsion of the torsion spring (5) on the rotating plate (3) is arranged between the rotating block (4) and the support sleeve (1), and a locking mechanism for locking the rotating block (4) after the rotating block (4) rotates is arranged between the rotating block (4) and the support sleeve (1); the adjusting mechanism comprises an adjusting hole (14) which is arranged on the side wall of the supporting sleeve (1) and communicated with the assembling hole (12), a first sealing cover (61) is connected to the outer end of the adjusting hole (14) in a threaded manner, a rotating pin (64) is rotatably arranged in the first sealing cover (61) in a penetrating manner, a bevel gear (62) is arranged at the inner end of the rotating pin (64), a movable rod at the outer end of the rotating pin (64) penetrates through the first sealing cover (61) and then extends out of the first sealing cover (61) and is welded with a rotating handle (63), an annular bevel gear face (41) which is used for being meshed with the bevel gear (62) is arranged on the end face of the rotating block (4) facing one side of the bevel gear (62), a first spring (65) which is used for pushing the bevel gear (62) to enable the bevel gear (62) to be meshed with the bevel gear face (41) is sleeved outside the rotating pin (64) between the first sealing cover (61) and the bevel gear, a positioning pin (15) which is partially inserted into a bevel gear (62) is arranged on the outer wall of the supporting shaft (13), and the bevel gear (62) is rotationally connected with the positioning pin (15); the locking mechanism comprises a slide way (16) which is arranged on the side wall of the support sleeve (1) and communicated with the assembling hole (12), a second sealing cover (71) is connected to the outer end face of the slide way (16) in a threaded manner, a slide rod (72) is movably arranged in the second sealing cover (71) in a penetrating manner, a limiting block (73) is connected to the inner end portion of the slide rod (72) in a threaded manner, a pull ring (74) is arranged at the outer end portion of the slide rod (72), a plurality of clamping grooves (42) into which the limiting block (73) can be clamped are formed in the outer peripheral wall of the rotating block (4), and a second spring (75) which is used for pushing the limiting block (73) to clamp the limiting block (73) into the clamping grooves (42) is sleeved outside the slide rod (72) between the second sealing cover (71); a first guide inclined plane (76) is arranged on the front end face of the lower end of the limiting block (73), and a second guide inclined plane (43) which can be matched with the first guide inclined plane (76) for guiding is arranged in the clamping groove (42); the anti-falling structure comprises a retaining ring (81) which is sleeved outside the supporting shaft (13) and used for abutting against the rotating block (4), a plurality of circumferentially distributed elastic sheets (82) are arranged on the inner peripheral wall of the retaining ring (81), and an annular embedding groove (17) for embedding the end part of the elastic sheet (82) is formed in the outer peripheral wall of the supporting shaft (13); the outer wall of the elastic sheet (82) is provided with a convex edge (83) which is used for abutting against the outer side wall of the support shaft (13); the end face of the support shaft (13) on one side of the retainer ring (81) is provided with an annular guide surface (18) which can be matched with the elastic sheet (82) for guiding so as to facilitate the end part of the elastic sheet (82) to be embedded into the annular embedding groove (17).

2. The wrist strength exerciser with the hand massage function according to claim 1, wherein a bearing (35) is mounted on the outer peripheral wall of the rotating plate (3), the outer peripheral wall of the rotating plate (3) is fixed to the inner ring of the bearing (35), an annular step (19) in which the bearing (35) can be embedded is arranged on the inner side wall of the opening end of the assembly hole (12), an annular boss (22) is arranged on the inner end face of the end cover (2), the annular boss (22) is in threaded connection with the annular step (19), and the annular boss (22) is pressed on the outer ring of the bearing (35).

3. The wrist strength exerciser with hand massage function according to claim 1, wherein the right end face of the support sleeve (1) is provided with a tension spring (9), one end of the tension spring (9) far away from the support sleeve (1) is provided with a U-shaped bending section (91) for holding, the bending section (91) is welded with the outer end of the tension spring (9) after being bent, a second anti-slip sleeve (92) wraps the outer portion of the vertical portion of the bending section (91), and a plurality of second anti-slip protrusions (93) are arranged on the outer wall of the second anti-slip sleeve (92).