Steel pipe machining piece transfer device

Abstract

The application relates to the technical field of steel product processing, in particular to a steel pipe processing piece transfer device which comprises a transfer platform, a plurality of transfer strips horizontally arranged on the top of the transfer platform, and a plurality of locking structures arranged between adjacent two transfer strips respectively; the locking structure comprises a plurality of bearing bases sliding between the adjacent two transfer strips, an arc-shaped strip arranged above the bearing base, and an arc-shaped rubber strip arranged at the bottom of the arc-shaped strip; the bearing base is used for supporting a steel pipe processing piece; a guide part for vertical sliding of the arc-shaped strip is arranged in the bearing base. The application has the effect of improving the rolling of the steel pipe processing piece and preventing the adjacent steel pipe processing pieces from colliding.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel product processing, and particularly relates to a steel pipe processing piece transfer device. BACKGROUND

[0002] Steel is a certain shape and performance material made of ingot, billet and steel through pressure processing, and the application of steel processing is wide and the types are various. Steel is an important material for national construction and realization of four modernizations. The existing steel includes a steel body. When the steel body is transported, a plurality of steel bodies are directly stacked together for transportation, or the plurality of steel bodies are bundled together for transportation through appropriate tools.

[0003] In the processing of pipe class steel products, transfer trolleys and other devices are needed to complete the transfer of steel pipe processing pieces in the workshop. The existing transfer trolleys are relatively simple in structure, and the steel pipe processing pieces on the trolleys are simply stacked together. In the subsequent transportation process, the unevenness of the factory road will cause the steel pipe processing pieces to vibrate, thereby causing the steel pipe processing pieces to roll.

[0004] In the related art, the unevenness of the factory road causes the steel pipe processing pieces to vibrate, thereby causing the steel pipe processing pieces to roll. The rolling of the steel pipe processing pieces will cause the steel pipe processing pieces to collide with each other, which will affect the quality of the surface of the steel pipe processing pieces. SUMMARY

[0005] In order to improve the problem that the rolling of the steel pipe processing pieces is easy to cause the collision between the adjacent steel pipe processing pieces, the present application provides a steel pipe processing piece transfer device.

[0006] The steel pipe processing piece transfer device provided by the present application adopts the following technical scheme:

[0007] A steel pipe processing piece transfer device, comprising a transfer platform, a plurality of transfer strips horizontally arranged on the top of the transfer platform, and a plurality of locking structures arranged between adjacent two transfer strips; the locking structure comprises a plurality of bearing bases sliding between adjacent two transfer strips, an arc-shaped strip arranged above the bearing base, and an arc-shaped rubber strip mounted on the bottom of the arc-shaped strip; the bearing base is used for supporting the steel pipe processing piece, and the bearing base is provided with a guide component for vertical sliding of the arc-shaped strip.

[0008] By adopting the above technical scheme, the arc-shaped rubber strip at the bottom of the arc-shaped strip is abutted to the outer peripheral surface of the steel pipe processing piece by the guide component, so as to lock the steel pipe processing piece between the arc-shaped rubber strip and the bearing base. Therefore, the plurality of steel pipe processing pieces are simply stacked together, and the collision marks on the surface of the steel pipe processing pieces during transportation are reduced.

[0009] Optionally, the guide component comprises a base through slot arranged on the top of the bearing base, a plurality of guide rollers rotatably arranged on the inner wall of the base through slot, and a plurality of guide strips arranged on the top of the bearing base through the corresponding base through slots; the guide strips pass between adjacent two guide rollers, and the plurality of guide strips are fixedly connected with the arc-shaped strips.

[0010] By adopting the above technical scheme, the arc-shaped strip slides downward along the length direction of the guide strip under the action of external force until the arc-shaped rubber strip at the bottom of the arc-shaped strip abuts against the steel pipe workpiece, so as to realize the locking of the steel pipe workpiece between the arc-shaped rubber strip and the bearing base.

[0011] Optionally, the bearing base is provided with a driving component for driving the arc-shaped rubber strip to abut against the steel pipe workpiece, the driving component comprises a winding wheel rotatably arranged in the bearing base, a driving motor arranged in the bearing base, and a plurality of steel wire strands wound around the circumferential side of the winding wheel; the output shaft of the driving motor is coaxially connected with the winding wheel, and the end portion of the steel wire strand away from the winding wheel is fixedly connected with the guide strip.

[0012] By adopting the above technical scheme, the driving motor drives one of the winding wheels to rotate and drives the other winding wheel to rotate through the meshing arrangement of the two rotating gears, and the two winding wheels simultaneously tighten the steel wire strand to make the arc-shaped strip slide downward along the length direction of the guide strip, so as to realize the effect that the arc-shaped rubber strip at the bottom of the arc-shaped strip abuts against the outer circumferential surface of the steel pipe workpiece.

[0013] Optionally, the top of the bearing base is provided with a slip-increasing component for reducing the friction between the bearing base and the steel pipe workpiece, the slip-increasing component comprises a slip-increasing protrusion arranged on the top of the bearing base, and a plurality of slip-increasing balls arranged on the top of the slip-increasing protrusion.

[0014] By adopting the above technical scheme, the plurality of slip-increasing balls on the top of the slip-increasing protrusion abut against the bottom of the outer circumferential surface of the steel pipe workpiece, and the sliding friction between the slip-increasing protrusion and the outer circumferential surface of the steel pipe workpiece is converted into the rolling friction between the slip-increasing balls and the outer circumferential surface of the steel pipe workpiece, so as to reduce the friction between the slip-increasing protrusion and the steel pipe workpiece as much as possible and avoid scratching the outer circumferential surface of the steel pipe workpiece by the bearing base as much as possible.

[0015] Optionally, the top of the transfer platform is provided with a moving component for the sliding of the bearing base, the moving component comprising a plurality of locking column shafts arranged above the transfer strip, and two bearing rings arranged on the outer wall of the bearing base; the locking column shaft is composed of a locking light pole and a screw straight pole; the bearing rings on the bearing base between the two locking light poles are rotationally arranged on the circumferential side of the locking light pole; and the bearing rings on the bearing base between the two screw straight poles are screw-connected with the screw straight pole.

[0016] By adopting the above technical scheme, when the steel pipe workpiece is pushed to the position between the two locking column shafts, the plurality of bearing bases between the two screw straight poles slide along the length direction of the screw straight pole, the bearing base drives the screw straight pole to rotate through the bearing ring, and the bearing base can be fixed between the two locking column shafts by controlling the rotation of the screw straight pole, so as to achieve the effect that the bearing base is fixed between the two locking column shafts.

[0017] Optionally, the transfer strip is provided with a clamping component for controlling the rotation of the locking column shaft, the clamping component comprising a first clamping disc fixed above the transfer strip, a second clamping disc arranged on the side of the first clamping disc away from the locking column shaft, and clamping teeth arranged close to the first clamping disc and the second clamping disc; and a synchronous component is arranged between the second clamping disc and the locking column shaft for synchronous rotation of the second clamping disc and the locking column shaft.

[0018] By adopting the above technical scheme, the first clamping disc and the second clamping disc are separated, so as to realize that the locking column shaft rotates to make the bearing base slide along the length direction of the locking column shaft; and the first clamping disc and the second clamping disc are engaged, so as to realize that the locking column shaft stops rotating to make the bearing base fixed on the circumferential side of the locking column shaft.

[0019] Optionally, the synchronous component comprises a telescopic sleeve fixed to the end of the locking column shaft, a telescopic straight pole penetrating the telescopic sleeve, and a tension spring connected between the end of the telescopic straight pole and the inner wall of the telescopic sleeve; the end of the telescopic straight pole away from the locking column shaft is fixedly connected with the second clamping disc; and the telescopic sleeve is internally provided with a limiting component for synchronous rotation of the telescopic straight pole and the telescopic sleeve.

[0020] By adopting the above technical scheme, the telescopic straight pole is retracted into the inside of the telescopic sleeve by the elastic force of the tension spring, so as to realize that the first clamping disc and the second clamping disc are engaged, and so as to realize that the locking column shaft stops rotating to make the bearing base fixed on the circumferential side of the locking column shaft.

[0021] Optionally, the limiting component comprises a long strip protrusion arranged on the inner circumferential surface of the telescopic sleeve and a long strip groove arranged on the outer circumferential surface of the telescopic straight rod; the long strip protrusion is inserted into the long strip groove on the circumferential side of the telescopic straight rod.

[0022] By adopting the above technical scheme, the long strip protrusion is inserted into the long strip groove on the circumferential side of the telescopic straight rod, so that the telescopic sleeve (26) does not affect the sliding of the telescopic straight rod (29), and at the same time, the telescopic sleeve (26) can drive the telescopic straight rod (29) to rotate synchronously.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. The arc-shaped rubber strip at the bottom of the arc-shaped strip plate driven by the guide component abuts against the outer circumferential surface of the steel pipe workpiece, so that the steel pipe workpiece is locked between the arc-shaped rubber strip and the bearing base, and the steel pipe workpieces are simply stacked together, and the surface scratches of the steel pipe workpieces during transportation are reduced.

[0025] 2. The plurality of slip-enhancing balls at the top of the slip-enhancing protrusion abut against the bottom of the outer circumferential surface of the steel pipe workpiece, and the sliding friction between the slip-enhancing protrusion and the outer circumferential surface of the steel pipe workpiece is converted into rolling friction between the slip-enhancing balls and the outer circumferential surface of the steel pipe workpiece, so as to reduce the friction between the slip-enhancing protrusion and the steel pipe workpiece as much as possible, and to avoid scratching the outer circumferential surface of the steel pipe workpiece by the bearing base as much as possible.

[0026] 3. The first clamping disc and the second clamping disc are separated, the locking column shaft can rotate to make the bearing base slide along the length direction of the locking column shaft, and the first clamping disc and the second clamping disc are engaged, the locking column shaft stops rotating to make the bearing base fixed to the circumferential side of the locking column shaft. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 FIG. 1 is a structural schematic diagram of a steel pipe workpiece transfer device in an embodiment of the present application.

[0028] Figure 2 FIG. 4 is a structural schematic diagram of a locking structure in an embodiment of the present application.

[0029] Figure 3 FIG. 6 is an exploded schematic diagram of a first clamping disc and a second clamping disc in an embodiment of the present application.

[0030] Figure 4 FIG. 8 is a structural schematic diagram of the inside of a bearing base in an embodiment of the present application.

[0031] 11, transfer platform; 12, universal wheel; 13, transfer column; 14, transfer strip; 15, second panel; 16, return spring; 17, locking structure; 18, locking strip; 19, locking column shaft; 20, bearing base; 21, bearing ring; 22, locking light pole; 23, spiral straight pole; 24, buffer disc I; 25, buffer disc II; 26, telescopic sleeve; 27, first occlusion disc; 28, tension spring; 29, telescopic straight pole; 30, second occlusion disc; 31, occlusion tooth; 32, long strip protrusion; 33, long strip groove; 34, slip enhancement groove; 35, slip enhancement protrusion; 36, slip enhancement ball; 37, compression spring; 38, base through groove; 39, guide strip; 40, guide roller; 41, arc-shaped strip; 42, arc-shaped rubber strip; 43, winding wheel; 44, rotating gear; 45, drive motor; 46, steel wire strand; 47, reversing wire wheel; 48, first panel. DETAILED DESCRIPTION

[0032] The following description will be made in conjunction with the accompanying drawings. Figures 1-4 The application is described in further detail.

[0033] Reference will be made to Figure 1 With Figure 2 A steel pipe workpiece transfer device includes a transfer platform 11 and four universal wheels 12 arranged at the bottom of the transfer platform 11, and the four universal wheels 12 are arranged at the bottom of the transfer platform 11 near the four top corners of the transfer platform 11 respectively. The top of the transfer platform 11 near the four top corners of the transfer platform 11 is fixed with a transfer column 13 in the vertical direction, and the transfer strip 14 is connected between the two transfer columns 13 on the front side of the transfer platform 11 and the two transfer columns 13 on the rear side of the transfer platform 11 in the horizontal direction. The transfer strip 14 is arranged in the vertical direction, and the transfer strip 14 on the front and rear sides of the transfer platform 11 is respectively a front strip and a rear strip, and the front strip and the rear strip have the same height from the transfer platform 11. The front strip and the rear strip are provided with a locking structure 17 for clamping the steel pipe workpiece, and the locking structure 17 is arranged in the length direction of the front strip.

[0034] Reference will be made to Figure 1 With Figure 2The locking structure 17 includes two locking plates 18 that are vertically fixed to the top of the front and rear plates, respectively. A locking shaft 19 is rotatably mounted between the adjacent sidewalls of the two locking plates 18, thereby enabling the locking shaft 19 to be rotatably mounted above the front and rear plates in a horizontal direction. Each locking structure 17 has two locking shafts 19 along the length of the front plate, and a bearing base 20 is provided between the two locking shafts 19. Two bearing bases 20 are provided along the length of the locking shaft 19. Bearing rings 21 are horizontally fixed to the left and right sidewalls of the bearing base 20 via support feet. The locking shaft 19 is composed of a locking rod 22 and a spiral rod 23, with a large inclination angle on the threads of the spiral rod 23.

[0035] Reference Figure 2 and Figure 3 A bearing ring 21 on the bearing base 20 between the two locking rods 22 is rotatably mounted on the periphery of the locking rod 22. The bearing ring 21 on the bearing base 20 between the two spiral rods 23 is spirally connected to the spiral rods 23. A buffer disc 1 24 is fixed to the rear side wall of the bearing base 20 between the two spiral rods 23 by a folding bracket. A buffer disc 25 is coaxially fixed to the side wall of the buffer disc 24 near the bearing base 20. Both the buffer disc 1 24 and the buffer disc are made of rubber cushioning material. A telescopic sleeve 26 is coaxially fixed to the end of one of the locking pins 19 away from the locking rod 22. A first engaging disc 27 is fixed to the side wall of the locking strip 18 away from the locking pin 19.

[0036] Reference Figure 2 and Figure 3 A telescopic straight rod 29 is inserted through the end of the telescopic sleeve 26 away from the locking pin 19. A tension spring 28 connects the end of the telescopic straight rod 29 near the locking pin 19 and the inner wall of the telescopic sleeve 26 near the locking pin 19. The end of the telescopic straight rod 29 away from the locking pin 19 passes through the locking strip 18 and the first engagement plate 27 and is coaxially fixed with a second engagement plate 30. Engaging teeth 31 are provided between the side walls of the first engagement plate 27 and the second engagement plate 30 that are close to each other. A long strip protrusion 32 is fixed on the inner circumferential surface of the telescopic sleeve 26 along its own length. A long strip groove 33 is opened on the outer circumferential surface of the telescopic straight rod 29 along its own length. The long strip protrusion 32 is inserted into the periphery of the telescopic straight rod 29 through the long strip groove 33, so that the telescopic sleeve 26 does not affect the sliding of the telescopic straight rod 29, and the telescopic sleeve 26 can drive the telescopic straight rod 29 to rotate synchronously.

[0037] Reference Figure 2 and Figure 4The top of the bearing base 20 is provided with a slip-increasing groove 34, and the top of the bearing base 20 is provided with slip-increasing convex blocks 35 for supporting steel pipe machining parts through the slip-increasing groove 34, and the slip-increasing convex blocks 35 and the top of the bearing base 20 are both concave arc-shaped. The top of the slip-increasing convex block 35 is uniformly covered with a plurality of slip-increasing balls 36, the plurality of slip-increasing balls 36 are all rotatably installed on the top of the slip-increasing convex block 35, a compression spring 37 is fixedly connected between the bottom of the slip-increasing convex block 35 and the groove bottom of the slip-increasing groove 34, and the height of the slip-increasing convex block 35 is less than the depth of the slip-increasing groove 34. The top of the bearing base 20 is provided with a base through groove 38 near the left and right sides of the bearing base 20, and the top of the bearing base 20 is vertically provided with guide strips 39 through the base through groove 38.

[0038] With reference to Figure 2 With reference to Figure 4 The two inner side walls of the base through groove 38 are both rotatably installed with guide rollers 40, and the guide strips 39 pass through between the two guide rollers 40. The top ends of the two guide strips 39 are jointly fixed with an arc-shaped strip 41 and an arc-shaped rubber strip 42 which are both arc-shaped, and the arc-shaped rubber strip 42 is arranged below the arc-shaped strip 41. The bearing base 20 is provided with a cavity, and the inner bottom surface of the bearing base 20 is rotatably installed with two wire winding wheels 43, the rotation shafts of the two wire winding wheels 43 are both coaxially fixedly installed with rotation gears 44, and the rotation gears 44 on the two wire winding wheels 43 are in meshing arrangement. The inner bottom surface of the bearing base 20 is fixedly installed with a driving motor 45, and the output shaft of the driving motor 45 is coaxially fixedly connected with one of the wire winding wheels 43.

[0039] With reference to Figure 2 With reference to Figure 4 The wire winding wheel 43 is provided with a plurality of turns of steel wire strands 46 around the side, the bearing base 20 is provided with a reversing wire wheel 47 near the two top corners of the bottom of the bearing base 20, the steel wire strands 46 pass through the reversing wire wheel 47 and are fixed to the bottom end of the guide strip 39. The two inner side walls of the bearing base 20 are both fixed with a first panel 48 in the horizontal direction, the side of the guide strip 39 is fixed with a second panel 15 in the horizontal direction, the first panel 48 is arranged below the second panel 15, the guide strip 39 is movably provided through the first panel 48, and the first panel 48 and the second panel 15 are fixedly connected with a return spring 16.

[0040] The implementation principle of the steel pipe processing piece transfer device disclosed by the embodiment of the application is as follows: first, the steel pipe processing piece is arranged on the bearing base 20 between the two spiral straight rods 23, and at this time, the steel pipe processing piece is arranged between the slip-enhancing convex block 35 and the arc-shaped rubber strip 42; the existing auxiliary equipment drives the first clamping disc 27 and the second clamping disc 30 to be separated from each other, and then pushes the steel pipe processing piece to the position abutting against the buffer disc one 24 along the length direction of the locking column shaft 19, and the buffer disc two 25 is clamped to the inner circumferential surface of the steel pipe processing piece. The slip-enhancing balls 36 on the top of the slip-enhancing convex block 35 abut against the bottom of the outer circumferential surface of the steel pipe processing piece, and the slip friction between the slip-enhancing convex block 35 and the outer circumferential surface of the steel pipe processing piece is converted into the rolling friction between the slip-enhancing balls 36 and the outer circumferential surface of the steel pipe processing piece, so that the friction between the slip-enhancing convex block 35 and the steel pipe processing piece is reduced as much as possible, and the outer circumferential surface of the steel pipe processing piece is prevented from being scratched by the bearing base 20 as much as possible.

[0041] When the steel pipe processing piece is completely pushed to the position between the two locking column shafts 19, the drive motors 45 in the two bearing bases 20 are powered on and started, the drive motor 45 drives one of the winding wheels 43 to rotate and drives the other winding wheel 43 to rotate through the meshing arrangement of the two rotating gears 44, the two winding wheels 43 simultaneously tighten the steel wire 46 to make the arc-shaped strip plate 41 slide downward along the length direction of the guide strip plate 39 until the arc-shaped rubber strip 42 at the bottom of the arc-shaped strip plate 41 abuts against the outer circumferential surface of the steel pipe processing piece, and the slip-enhancing convex block 35 is retracted toward the inside of the slip-enhancing groove 34 through the abutting pressure of the arc-shaped rubber strip 42. Since the height of the slip-enhancing convex block 35 is less than the depth of the slip-enhancing groove 34, the slip-enhancing convex block 35 is completely retracted into the slip-enhancing groove 34, so that the steel pipe processing piece is fixed at the position between the bearing base 20 and the arc-shaped rubber strip 42.

[0042] When the steel pipe processing piece is fixed between the bearing base 20 and the arc-shaped rubber strip 42, the existing auxiliary equipment releases the first clamping disc 27, so that the meshing teeth 31 between the first clamping disc 27 and the second clamping disc 30 are meshed with each other. Since the long strip convex 32 is inserted into the side of the telescopic straight rod 29 through the long strip groove 33, the second clamping disc 30 drives the locking column shaft 19 to stop rotating, so that the two bearing bases 20 are fixed to the side of the locking column shaft 19.

[0043] The above is the preferred embodiment of the application, which does not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape and principle of the application should be covered in the protection scope of the application.

Claims

1. A steel pipe workpiece transfer device, comprising a transfer platform (11), a transfer column (13) is fixed in a vertical direction at a position close to each of the four top corners of the top of the transfer platform (11), a transfer strip plate (14) is connected in a horizontal direction between two transfer columns (13) on the front side of the transfer platform (11) and between two transfer columns (13) on the rear side of the transfer platform (11), a plurality of transfer strip plates (14) are provided in a vertical direction, the transfer strip plates (14) on the front and rear sides of the transfer platform (11) are respectively front and rear strip plates, a locking structure (17) for clamping a steel pipe workpiece is provided between the front and rear strip plates at the same height from the transfer platform (11), and the locking structure (17) is provided in a plurality of numbers along the length direction of the front strip plate; the locking structure (17) comprises a plurality of bearing bases (20) sliding between adjacent two transfer strip plates (14), an arc-shaped strip plate (41) provided above the bearing base (20), and an arc-shaped rubber strip (42) mounted at the bottom of the arc-shaped strip plate (41); the bearing base (20) is used for supporting a steel pipe workpiece, a guide component for vertical sliding of the arc-shaped strip plate (41) is arranged in the bearing base (20), the guide component comprises a base through slot (38) provided at the top of the bearing base (20), a plurality of guide rollers (40) rotatably mounted to the inner wall of the base through slot (38), and a plurality of guide strip plates (39) passing through the base through slot (38) and arranged at the top of the bearing base (20); the guide strip plate (39) passes between adjacent two guide rollers (40), and a plurality of guide strip plates (39) are fixedly connected with the arc-shaped strip plate (41); a driving component for driving the arc-shaped rubber strip (42) to press against a steel pipe workpiece is arranged in the bearing base (20), the driving component comprises a winding wheel (43) rotatably mounted in the bearing base (20), a driving motor (45) mounted in the bearing base (20), and a plurality of turns of steel wire strands (46) wound around the side of the winding wheel (43); the output shaft of the driving motor (45) is coaxially connected with the winding wheel (43), and the end portion of the steel wire strand (46) away from the winding wheel (43) is fixedly connected with the guide strip plate (39).The top of the bearing base (20) is provided with a slip-increasing component for reducing the friction between the bearing base (20) and the steel pipe workpiece, the slip-increasing component comprises slip-increasing bosses (35) penetrating the top of the bearing base (20), and a plurality of slip-increasing balls (36) arranged on the top of the slip-increasing bosses (35); the top of the transfer platform (11) is provided with a moving component for the sliding of the bearing base (20), the moving component comprises a plurality of locking column shafts (19) arranged above the transfer strip (14), and two bearing rings (21) mounted on the outer wall of the bearing base (20); the locking column shaft (19) is formed by splicing a locking light pole (22) and a spiral straight pole (23), the bearing ring (21) on the bearing base (20) between the two locking light poles (22) is rotationally mounted on the side of the locking light pole (22), and the bearing ring (21) on a plurality of bearing bases (20) between the two spiral straight poles (23) is spirally connected with the spiral straight pole (23).

2. The apparatus of claim 1, wherein: The transfer strip (14) is provided with a clamping component for controlling the rotation of the locking column shaft (19), which comprises a first clamping disc (27) fixed above the transfer strip (14), a second clamping disc (30) provided on the side of the first clamping disc (27) away from the locking column shaft (19), and a clamping tooth (31) provided on the side of the first clamping disc (27) and the second clamping disc (30) close to each other; the second clamping disc (30) and the locking column shaft (19) are provided with a synchronous component for synchronous rotation of the second clamping disc (30) and the locking column shaft (19).

3. The apparatus of claim 2, wherein: The synchronous component comprises a telescopic sleeve (26) fixed to the end of the locking column shaft (19), a telescopic straight rod (29) penetrating the telescopic sleeve (26), and a tension spring (28) connected between the end of the telescopic straight rod (29) and the inner wall of the telescopic sleeve (26), the end of the telescopic straight rod (29) away from the locking column shaft (19) is fixedly connected with the second clamping disc (30), and the telescopic sleeve (26) is provided with a limiting component for synchronous rotation of the telescopic straight rod (29) and the telescopic sleeve (26).

4. The apparatus of claim 3, wherein: The limiting component comprises a long strip protrusion (32) provided on the inner circumferential surface of the telescopic sleeve (26) and a long strip groove (33) provided on the outer circumferential surface of the telescopic straight rod (29); the long strip protrusion (32) is inserted into the circumferential side of the telescopic straight rod (29) through the long strip groove (33).

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