CN212020671U - Oblique saw support with roller frame storage function - Google Patents

Abstract

The utility model relates to a miter saw support with a roller frame storage function, which comprises a support table board and a foot rest for supporting the support table board, wherein telescopic rods which horizontally extend and retract relative to the support table board are arranged at two ends of the support table board, and the roller frame is connected onto the telescopic rods; the receiving mechanism comprises a receiving rod and a receiving telescopic rod which is sleeved on the receiving rod and can relatively stretch out and draw back. The utility model discloses increased the structure of accomodating the cylinder frame on foot rest upper portion, after the foot pole is folded, fixed the cylinder frame of accomodating structural upset thereupon, the cylinder frame is in one side of folding back support, and the direction of height and the length direction of cylinder frame do not all expose in the support.

Description

Oblique saw support with roller frame storage function

Technical Field

The utility model belongs to carpenter's support field, concretely relates to oblique fracture saw support that take roller frame to accomodate.

Background

The miter saw support is an auxiliary support for woodworking and is used for supporting and fixing a miter saw and supporting timber so as to complete cutting of the timber. The foot rest structure of the support can be folded for the convenience of packaging, transportation, carrying and reduction of storage space. The roller frame for supporting the wood cannot be folded, generally, the roller frame is lowered to the lowest position and is adjusted to the position closest to the table top of the support, the mode is more suitable for the condition that the height of the roller frame is shorter, if the height of the roller frame is higher, the overlong upright post of the roller frame is relatively exposed on the table top of the support and the folded foot rest support and cannot be completely stored; or the roller frame is directly disassembled and then is additionally stored, so that the operation is complicated and the roller frame is easy to lose.

Disclosure of Invention

The utility model discloses mainly to the problem of accomodating of drum frame, invented a take in oblique fracture saw support of drum frame, increased the structure of accomodating the drum frame in foot rest upper portion, after the foot pole is folded, the drum frame that fixes on accomodating the structure is along with the upset, the drum frame is in one side of the support after folding, the direction of height and the length direction of drum frame do not expose in the support; the containing mechanism can be stretched and retracted, and the containing telescopic rod is retracted in the containing rod during operation; when the roller frame is stored, the storage telescopic rods are relatively unfolded and used for fixing the roller frame; the foot rest of the bent pipe oblique fracture saw support adopts an X-shaped cross hinge structure, the unfolding and the reverse folding of the foot rods are realized through the hook body of the rotary clamping piece and the concave-convex clamping of the positioning rod, and the foot rest is provided with wheels and a standing support, so that the bent pipe oblique fracture saw support can be conveniently pushed and pulled after being folded and can also be vertically placed in a standing way; the foot rods are provided with the winding frames, so that the power wires can be wound and combed conveniently.

The above technical problem of the present invention can be solved by the following technical solutions: a miter saw support with a roller frame for storage comprises a support table top and a foot rest for supporting the support table top, wherein telescopic rods which horizontally extend and retract relative to the support table top are arranged at two ends of the support table top, and the telescopic rods are connected with the roller frame; the receiving mechanism comprises a receiving rod and a receiving telescopic rod which is sleeved on the receiving rod and can relatively stretch out and draw back.

When the number of the roller frames is large, the relatively exposed rod pieces of the accommodating rods need to have certain lengths, but the excessively long extending rod pieces can hinder normal operation of operators; therefore, the storage rod is provided to be retractable.

Preferably, the roller frame comprises a vertical upright post and a horizontal roller piece vertically connected to the upper end of the upright post, and a double-shaft sleeve piece is sleeved on the upright post; the double-shaft kit comprises a horizontal shaft base, wherein a vertical shaft hole which is vertically penetrated is formed in one half side of the shaft base, the vertical shaft hole is connected with the upright post, and an adjusting fastener for positioning is arranged on one side of the vertical shaft hole; the other half limit of axle base is equipped with the horizontal shaft hole that the level link up, horizontal shaft hole cup joint in the telescopic link, and one side in this horizontal shaft hole is provided with the regulation fastener that is used for the location.

Preferably, the receiving mechanism comprises a horizontal receiving rod, the receiving rod is fixed at the upper part of the foot rest, and the axial direction of the receiving rod is vertical to the axial direction of the table top of the bracket; the part of the receiving rod extending out of the foot rest is used for connecting the roller frame.

Preferably, the receiving mechanism comprises a horizontal receiving rod, the receiving rod is fixed at the upper part of the foot rest, and the axial direction of the receiving rod is vertical to the axial direction of the table top of the bracket; the part of the receiving rod extending out of the foot rest is used for being connected with the roller frame, and a horizontal shaft hole of the double-shaft kit is sleeved on the receiving rod.

Preferably, the foot rest comprises a first foot support and a second foot support which are hinged in a cross mode, the upper end of the first foot support is hinged to one end of the table top of the support, the upper end of the second foot support is hinged to the other end of the table top of the support, and the middle of the first foot support and the middle of the second foot support are hinged to each other; the storage mechanism is arranged on the upper portion of the first foot support.

Preferably, the first leg support comprises two side-by-side first leg rods, a handle which is bent and extended downwards relatively and vertically is connected between the upper ends of the two first leg rods, and a standing support which is bent and extended upwards relatively and vertically is connected between the lower ends of the two first leg rods.

Preferably, the second leg support comprises two parallel second leg rods positioned at the upper part and two parallel third leg rods positioned at the lower part, wherein the upper ends of the second leg rods are hinged to the support table board, the upper ends of the third leg rods are hinged to the lower parts of the second leg rods, the upper parts of the third leg rods are hinged to the middle parts of the first leg rods, a cross rod is vertically connected between the upper parts of the third leg rods, one end of the cross rod is hinged to a rotary clamping piece with a hook body, meanwhile, the second leg rods close to the rotary clamping piece, one side of the lower ends of the second leg rods are provided with positioning columns which are relatively protruded, and the hook body of the rotary clamping piece can be correspondingly clamped on the positioning rod; and a section of spring is connected between the upper part of the third foot rod and the rotary clamping piece.

Preferably, the upper part and the lower part of the first foot bar are provided with wire reels for winding and combing power wires, the wire reel positioned at the upper part of the first foot bar is provided with a plate which is inclined upwards relative to the first foot bar, and the wire reel positioned at the lower part of the first foot bar is provided with a plate which is inclined downwards relative to the first foot bar; one end or one side of the support table surface is provided with a hanging rack for hanging tools.

Preferably, the lower ends of the two third foot rods which are arranged side by side are vertically connected with a wheel axle, and the two ends of the wheel axle are connected with wheels; the wheel shaft comprises a section of hollow outer wheel shaft and inner wheel shafts sleeved at two ends of the outer wheel shaft respectively, and the inner wheel shafts extend to the middle part from the end part of the outer wheel shaft; a plurality of first positioning holes which are arranged at intervals are formed in the side wall of the outer wheel shaft, a second positioning hole is formed in the side wall, close to the inner end, of the inner wheel shaft, and the first positioning holes can be aligned with the second positioning holes; meanwhile, a bent elastic sheet is arranged at the inner end of the inner wheel shaft, one end of the elastic sheet is provided with an elastic buckle which is relatively raised, and the elastic buckle penetrates through a positioning hole in the inner wheel shaft and simultaneously penetrates through a positioning hole in the outer wheel shaft aligned with the positioning hole to form positioning. The wheel shafts are telescopic, so that the distance between the wheels can be adjusted, and the distance between the wheels can be adjusted according to the ground condition.

To sum up, compared with the prior art, the utility model has the following advantages:

the utility model adds the structure of the storage roller frame on the upper part of the foot rest, when the foot bar is folded, the roller frame fixed on the storage structure is turned over, the roller frame is positioned at one side of the folded bracket, the height direction and the length direction of the roller frame are not exposed out of the bracket, and the storage mechanism can be extended and retracted, the storage telescopic rod is retracted in the storage rod during operation; when the roller frame is stored, the storage telescopic rods are relatively unfolded and used for fixing the roller frame; the utility model discloses a foot rest adopts X type cross-hinged structure, realizes the expansion and the reverse folding of foot rest through the hook body of rotatory fastener and the unsmooth block of locating lever between the foot rest, and the foot rest has the wheel and stands the support, can make things convenient for the push-and-pull after folding, also can vertically stand and place, has the bobbin on the foot rest moreover, is convenient for twine and comb the power cord.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a front view of the present invention;

fig. 3 is a top view of the present invention;

fig. 4 is a schematic view of the present invention in a folded state;

fig. 5 is a schematic view of the hinge portion of the first leg bar and the second leg bar of the present invention;

FIG. 6 is a cross-sectional view of the clamping mechanism of the screw base of the present invention;

figure 7 is a cross-sectional view of the wheel axle and wheel of the present invention;

fig. 8 is a sectional view of the storage mechanism of the present invention.

The reference numbers in the figures are: 1. a support table-board; 11. a telescopic rod; 12. a hanger; 2. a roller frame; 21. a column; 22. a horizontal roller member; 23. a shaft base; 24. a vertical shaft hole; 25. a horizontal shaft hole; 26. adjusting the fastener; 3. a storage mechanism; 31. a storage rod; 32. accommodating the telescopic rod; 4. a foot rest; 40. a bobbin; 41. a first leg bar; 42. a second leg bar; 43. a third leg bar; 44. a handle; 45. a standing support; 46. a cross bar; 47. rotating the engaging member; 48. a positioning column; 49. a spring; 6. a wheel shaft; 60. a wheel; 61. positioning holes; 62. a spring plate; 63. snapping; 9. a screw base; 90. a fixing hole; 91. mounting holes; 92. fastening the mounting piece; 93. a tool holder; 94. a base; 95. a clamping groove; 96. a static clamping block; 97. a movable clamping block; 98. an eccentric rotating positioning member; 99. and (7) mounting the platform.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example 1:

as shown in fig. 1, 2 and 3, the oblique fracture saw support with the roller frame for storage mainly comprises a support table board 1, a foot rest 4 and a screw rod seat 9; the support table-board 1 is provided with two parallel long rod pieces, and a short rod is vertically fixed between the long rod pieces so as to form a rectangular frame table-board. A hanging rack 12 for hanging tools is fixed at one end of the support table board 1, the hanging rack 12 is fixed at one end of the support table board 1 and extends downwards relatively, and a hook body is arranged at the lower end of the hanging rack 12.

Two screw rod seats 9 are arranged on the support table-board 1 and mainly formed by connecting a clamping mechanism and an installation platform 99; as shown in fig. 6, the main body of the clamping mechanism is a base 94, the base 94 is formed by vertically connecting a top plate and two side plates, the lower parts of the two side plates are provided with clamp grooves 95 with downward openings, the profiles of the clamp grooves 95 are matched with the profiles of the table top of the support, one end of each clamp groove 95 is fixed with an arc-shaped static clamp block 96, the other end of each clamp groove 95 is hinged with an arc-shaped movable clamp block 97 through a pin shaft, an operating end of the base 94 is hinged with an eccentric rotating positioning piece 98 through a pin, the inner end of an eccentric block of the eccentric rotating positioning piece 98 can be abutted against the movable clamp block 96, the eccentric block is provided with a handle which extends downwards relatively, and the handle. The clamping distance between the stationary block 96 and the movable block 97 is changed by rotating the eccentric rotary positioning member 98.

The top surface of the base 94 is provided with a hollow groove, and a bolt and a nut are connected in the groove and are fixedly connected with a mounting platform 9 through the bolt and the nut; the mounting platform 9 has dozens of through holes vertically penetrating, one part of the through holes is used for fixing the connecting base 94, and the other part of the through holes is used for fixing a cutting machine or a clamp.

A row of fixing holes 90 arranged at intervals is arranged on the central axial line part of the mounting platform 9, the fixing holes 90 are all long waist holes, and the axial direction of the fixing holes 90 is consistent with the axial direction of the mounting platform 9. Two rows of mounting holes 91 are respectively arranged on two sides of the fixing hole 90, the twenty-multiple rows of mounting holes 91 are arranged at intervals, the mounting holes 91 are long waist holes, and the axial direction of the mounting holes 91 is vertical to the axial direction of the mounting platform 9.

In the fixing holes 90 in the middle of the mounting platform 9, two of the fixing holes 90 are respectively connected with a fastening mounting part 92, the fastening mounting parts 92 adopt long bolts, the heads of the long bolts are positioned below the fixing holes 90 and are fastened by nuts, and the screws of the long bolts are positioned above the fixing holes 90. The miter saw, the latter cutting implement, can be secured to the mounting platform 9 by a fastener mount 92. Depending on the actual installation requirements, a fastening mounting 92 can be attached in the other mounting hole 91 to secure a miter saw or cutting implement.

In the fixing hole 90 in the middle of the mounting platform 9, two fixing holes 90 are connected with bolts and nuts, and are fixedly connected with the base 94 below.

The tool rack 93 is fixed on one side of the mounting platform 9 and close to the end part, the tool rack 93 is arranged into a storage rack with an inserting through hole, a cup can be placed in a larger through hole, a small tool can be inserted in a smaller through hole, the end part of the storage rack is provided with a hook body bent in an inclined mode, and the small tool can be hung on the hook body.

In practical application, two screw rod seats 9 are usually required to be fixed side by side for use, and the two mounting platforms 99 together provide a larger mounting platform for a miter saw or other cutting machines, so that the miter saw or other cutting machines are convenient to support and fix; the mounting platform 99 may also hold a clamp for clamping a workpiece to be machined.

The long rod member forming the support table-board 1 is a hollow tube, only one end of the long rod member is sleeved with a telescopic rod 11, two ends of the support table-board 1 are respectively sleeved with a telescopic rod 11, and the two telescopic rods 11 are not on the same straight line; the telescopic rod 11 is a square tube, the sleeve joint part of the telescopic rod 11 and the long rod piece is provided with a threaded hole, a fastening stud and other structures, and the telescopic rod 11 is adjusted to stretch and position by rotating the fastening stud.

Each telescopic rod 11 can be provided with 1 or more roller frames 2; specifically, the roller frame 2 mainly comprises a vertical upright post 21 and a horizontal roller piece 22 vertically connected to the upper end of the upright post 21, a double-shaft kit is sleeved on the upright post 21, the main body of the double-shaft kit is a section of a horizontal and hollow square tube shaft sleeve type shaft base 23, a square vertical shaft hole 24 which is vertically penetrated is formed in one half side of the shaft base 23, the upright post 21 is connected in the vertical shaft hole 24, one side of the vertical shaft hole 24 is hinged with an adjusting fastener 26, the adjusting fastener 26 is an eccentric rotating piece, and the eccentric rotating piece is rotated to be abutted against the upright post 21 to form positioning; the other half limit of axle base 23 has the square horizontal shaft hole 25 that the level link up, and horizontal shaft hole 25 cup joints in telescopic link 11, and the articulated one regulation fastener 26 of downside in this horizontal shaft hole 25, regulation fastener 26 is eccentric rotation piece, rotates the piece through rotatory eccentric and makes it contradict with telescopic link 11 and form the location.

The foot rest 4 is formed by mutually crossing and hinging a first foot support and a second foot support, the foot rest 4 is hinged in an X shape, and the hinged part is arranged in the middle of the first foot support and the second foot support; specifically, first foot support includes two first foot poles 41 side by side, and the upper end of two first foot poles 41 passes through the bearing frame and the one end of axle hinge in support mesa 1, connects the handle 44 of the U type that extends of buckling perpendicularly downwards relatively between the upper end of two first foot poles 41, connects the stand support 45 of the U type that extends of buckling perpendicularly upwards relatively between the lower extreme of two first foot poles 41, and the lower extreme of two first foot poles 41 still is fixed with the callus on the sole.

The second leg support comprises two second leg rods 42 which are arranged side by side at the upper part and two third leg rods 43 which are arranged side by side at the lower part, wherein, the upper ends of the two second foot rods 42 are hinged with the other end of the support table board 1 through a bearing seat and a shaft, the upper end of the third foot rod 43 is hinged with the lower part of the second foot rod 42 through a pin, the upper part of the third foot rod 43 is hinged with the middle part of the first foot rod 41 through a pin, a cross rod 46 is vertically connected between the upper parts of the third foot rods 43, one end of the cross rod 46 is hinged with a rotary clamping piece 47 with a hook body through a shaft, the rotary clamping piece 47 is positioned between the third foot rod 43 and the second foot rod 42, meanwhile, one side of the lower end of one second leg 42 close to the rotary engaging member 47 is provided with a positioning column 48 protruding relatively, the hook formed by the inward concave of the rotary engaging piece 47 can be correspondingly engaged with the positioning rod 48, as shown in fig. 5; a section of spring 49 is connected between the upper part of the third leg rod 43 and the rotary engaging piece 47.

When the foot rest 4 is unfolded for use, the rotary engaging member 47 of the third leg 43 is engaged with the positioning post 48 of the second leg 42, and the first leg 41 is hinged to the second leg 42 and the third leg 43.

As shown in fig. 4, when the stand 4 is folded, the rotary engaging member 47 is disengaged from the positioning post 48, the third leg 43 rotates reversely relative to the second leg 42 and is folded to gradually close to the stand table 1, and the first leg 41 rotates relative to the stand table 1 to finally complete the folding of the stand 4.

The first leg bracket is characterized in that the upper part and the lower part of one first leg rod 41 are provided with a winding frame 40, the winding frame 40 is used for winding and combing power lines, the winding frame 40 positioned on the upper part of the first leg rod 41 is a plate which is inclined upwards relative to the first leg rod 41, and the winding frame 40 positioned on the lower part of the first leg rod 41 is a plate which is inclined downwards relative to the first leg rod 41; in operation, the power cord may be wound around the two bobbins 40.

The second bracket is vertically connected with the wheel axle 6 between the lower ends of the two third foot rods 43 which are arranged side by side, and the two ends of the wheel axle 6 are connected with wheels 60; as shown in fig. 7, the wheel shaft 6 is telescopic and comprises a hollow outer wheel shaft and inner wheel shafts respectively sleeved at two ends of the outer wheel shaft, wherein the inner wheel shafts extend from the end parts to the middle parts of the outer wheel shafts; the side wall of the outer wheel shaft is provided with a plurality of first positioning holes 61 which are arranged at intervals, the side wall of the inner wheel shaft close to the inner end is provided with a second positioning hole, and the first positioning holes 61 can be aligned with the second positioning holes; meanwhile, a bent elastic sheet 62 is arranged at the inner end of the inner wheel shaft, one end of the elastic sheet 62 is provided with an elastic buckle 63 which is relatively raised, and the elastic buckle 63 passes through a second positioning hole on the inner wheel shaft and simultaneously passes through a first positioning hole 61 on the outer wheel shaft aligned with the second positioning hole to form positioning.

The upper part of the first leg support is provided with a receiving mechanism 3 for uniformly arranging the roller frames 2, specifically, the receiving mechanism 3 is provided with a section of horizontal receiving rod 31, the receiving rod 31 is a hollow square tube, the receiving rod 31 is vertically fixed at the upper ends of two first leg rods 41, and the axial direction of the receiving rod 31 is vertical to the axial direction of the support table board 1; as shown in fig. 8, two ends of the storage rod 31 are sleeved with a section of square tubular storage telescopic rod 32, and the storage telescopic rod 32 extends from the end part of the storage rod 31 to the middle part; the side wall of the accommodating rod 31 is provided with a plurality of positioning holes, and the inner end of the accommodating telescopic rod 32 is provided with an elastic buckle which can be correspondingly inserted into the positioning holes. After the retractable accommodating rod 32 is unfolded, the part of the retractable accommodating rod extending out of the first leg 41 is used for connecting the roller frame 2, specifically, a double-shaft kit is used for connecting, and the horizontal shaft hole 25 of the double-shaft kit is sleeved on the retractable accommodating rod 32 and is fastened and fixed.

As shown in fig. 4, with the foot rest 4 folded, the roller frame 2 connected to the receiving rod is in a side-tipping state, and the horizontal roller member 22 is turned from horizontal to vertical.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (9)

1. A miter saw support with a roller frame for storage comprises a support table board (1) and a foot rest (4) for supporting the support table board, wherein telescopic rods (11) which are horizontally telescopic relative to the support table board are arranged at two ends of the support table board, and the telescopic rods are connected with roller frames (2), and is characterized in that the foot rest is hinged with the support table board and can be folded to be close to the support table board, and a storage mechanism (3) for uniformly storing the roller frames is arranged on the foot rest;

the containing mechanism comprises a containing rod (31) and a containing telescopic rod (32) which is sleeved on the containing rod and can relatively extend and retract.

2. The miter saw support with roller frame storage according to claim 1, wherein the roller frame comprises a vertical upright (21), a horizontal roller member (22) vertically connected to the upper end of the upright, and a double-shaft sleeve member is sleeved on the upright; the double-shaft kit comprises a section of horizontal shaft base (23), a vertical shaft hole (24) which is vertically penetrated is formed in one half side of the shaft base, the vertical shaft hole is connected with the upright post, and an adjusting fastener (26) for positioning is arranged on one side of the vertical shaft hole; the other half limit of axle base is equipped with level through-going horizontal shaft hole (25), and the horizontal shaft hole cup joint in the telescopic link, and one side in this horizontal shaft hole is provided with the regulation fastener that is used for the location.

3. The miter saw support with roller frame storage according to claim 2, wherein the storage mechanism comprises a horizontal hollow storage rod, the storage rod is fixed on the upper part of the foot rest, and the axial direction of the storage rod is vertical to the axial direction of the table top of the support; two ends of the containing rod are sleeved with a section of containing telescopic rod, and the containing telescopic rods extend into the middle part from the end parts of the containing rod; the side wall of the containing rod is provided with a plurality of positioning holes, and meanwhile, the inner end of the containing telescopic rod is provided with an elastic buckle which can be correspondingly inserted into the positioning holes.

4. A miter saw support with roller frame storage according to claim 3, wherein the part of the storage rod extending out of the foot rest is used for connecting the roller frame, and the horizontal shaft hole of the double-shaft kit is sleeved on the storage rod.

5. The miter saw support with roller frame storage according to claim 1, wherein the foot rest comprises a first foot rest and a second foot rest which are hinged to each other in a crossed manner, the upper end of the first foot rest is hinged to one end of the table top of the support, the upper end of the second foot rest is hinged to the other end of the table top of the support, and the middle part of the first foot rest and the middle part of the second foot rest are hinged to each other; the storage mechanism is arranged on the upper portion of the first foot support.

6. The miter saw support with roller frame storage according to claim 5, wherein the first leg support comprises two first leg rods (41) arranged side by side, a handle (44) extending in a relatively downward vertical bending manner is connected between the upper ends of the two first leg rods, and a standing support (45) extending in a relatively upward vertical bending manner is connected between the lower ends of the two first leg rods.

7. The miter saw support with roller frame storage according to claim 6, wherein the second foot support comprises two second foot rods (42) arranged side by side at the upper part and two third foot rods (43) arranged side by side at the lower part, wherein the upper ends of the second foot rods are hinged to the table top of the support, the upper ends of the third foot rods are hinged to the lower part of the second foot rods, the upper parts of the third foot rods are hinged to the middle part of the first foot rod, a cross rod (46) is vertically connected between the upper parts of the third foot rods, one end of the cross rod is hinged to a rotary clamping member (47) with a hook body, and meanwhile, the second foot rod close to the rotary clamping member is provided with a positioning column (48) which protrudes relatively at one side of the lower end, so that the hook body of the rotary clamping member can be correspondingly clamped to the positioning rod; a section of spring (49) is connected between the upper part of the third foot rod and the rotary clamping piece.

8. The miter saw frame with roller holder storage according to claim 7, wherein upper and lower portions of the first leg bar are provided with bobbins (40) for winding and combing a power line, the bobbin at the upper portion of the first leg bar is provided as a plate inclined upward with respect to the first leg bar, and the bobbin at the lower portion of the first leg bar is provided as a plate inclined downward with respect to the first leg bar; one end or one side of the table surface of the support is provided with a hanging rack (12) for hanging tools.

9. The miter saw support with roller frame storage according to claim 7, wherein a wheel axle (6) is vertically connected between the lower ends of the two third foot rods in parallel, and both ends of the wheel axle are connected with wheels (60); the wheel shaft comprises a section of hollow outer wheel shaft and inner wheel shafts sleeved at two ends of the outer wheel shaft respectively, and the inner wheel shafts extend to the middle part from the end part of the outer wheel shaft; a plurality of first positioning holes (61) which are arranged at intervals are formed in the side wall of the outer wheel shaft, a second positioning hole is formed in the side wall, close to the inner end, of the inner wheel shaft, and the first positioning holes can be aligned with the second positioning holes; meanwhile, a bent elastic sheet (62) is arranged at the inner end of the inner wheel shaft, one end of the elastic sheet is provided with an elastic buckle (63) which is relatively raised, and the elastic buckle penetrates through a positioning hole in the inner wheel shaft and simultaneously penetrates through a positioning hole in the outer wheel shaft aligned with the positioning hole to form positioning.

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