Street lamp erecting auxiliary device

Abstract

The invention relates to the field of street lamp erection, and particularly discloses a street lamp erection auxiliary device which comprises a supporting frame, two stand columns are arranged on the supporting frame in a sliding mode, and a turnover assembly used for clamping a street lamp is rotationally arranged between the two stand columns. The supporting frame is placed on a street lamp mounting base, the overturning assembly clamps the bottom of a street lamp pole through two arc-shaped clamping plates, a winch cable is fixed to the top end of the lamp pole, the lamp pole is pulled to be in a vertical state from a horizontal state through a winch, and then the street lamp slides to the street lamp base along a bottom rod along with a stand column and is aligned with the street lamp base; the street lamp can be installed on the street lamp base to replace hoisting equipment to hoist the street lamp, and traffic jam caused by road occupation construction is reduced.

Description

Technical Field

[0001] The present invention relates to the field of street lamp erection, and specifically to an auxiliary device for street lamp erection. Background Art

[0002] When installing street lamps, lifting equipment is often required to lift the street lamps, and then move the street lamps to the base and install them on the base. Generally, the lifting equipment is relatively large. Therefore, when lifting street lamps, the lifting equipment generally parks on the road, resulting in the need for the lifting equipment to occupy the road for construction, which has an impact on road traffic. Summary of the Invention

[0003] The purpose of the present invention is to provide an auxiliary device for street lamp erection to overcome the above-mentioned defects in the prior art.

[0004] According to an auxiliary device for street lamp erection of the present invention, it includes a support frame, two columns are slidably arranged on the support frame, and a flipping assembly for clamping the street lamp is rotatably arranged between the two columns; The support frame includes two symmetrically arranged bottom rods, a guide rod is fixed on the upper end surface of the bottom rod, a groove is formed in the upper end surface of the guide rod along its length direction, and a plurality of support wheels are rotatably connected in the groove and are equidistantly arranged along its length direction; The column includes a sliding plate, a support plate and a bushing. The sliding plate is slidably connected to the guide rod and abuts against the outer circumference of the support wheel. The support plate is fixed on the upper end surface of the sliding plate, and the bushing is fixed on the upper end of the support plate; The flipping assembly includes two symmetrically arranged rotating shafts. The rotating shafts are rotatably connected in the bushings. A connecting plate is fixed on each side of the two rotating shafts facing each other. A fixing plate is fixed on each side of the two connecting plates facing each other. Arc-shaped clamping plates are fixed on the upper and lower end faces of the fixing plate.

[0005] Through the above technical solution, the support frame is placed on the street lamp installation base, the flipping assembly clamps the bottom of the street lamp post through two arc-shaped clamping plates, the winch cable is fixed to the top of the lamp post, the lamp post is pulled from the horizontal state to the vertical state by the winch, and then the street lamp slides along the bottom rod with the column to the street lamp base and is aligned. After loosening the two arc-shaped clamping plates, the street lamp can be installed on the street lamp base, thus replacing the lifting equipment to lift the street lamp and reducing the traffic jam caused by road occupation construction.

[0006] Preferably, the support frame further includes four support rods fixed between the two bottom rods. Two symmetrically arranged bottom plates are arranged on the lower side of the bottom rod. The four support rods are respectively fixed on the two bottom plates. The upper end surface of the bottom plate abuts against the lower end surface of the bottom rod. The two bottom plates are respectively located at both ends of the bottom rod.

[0007] Through the above technical solution, the setting of the bottom plate can effectively increase the contact area between the support frame and the ground, thereby increasing the stability of the support frame.

[0008] Preferably, the two support rods at one end of the guide rod are formed by splicing a detachable support rod and a fixed support rod. The fixed support rod is fixed on the bottom rod. The bottom plate near the detachable support rod is formed by splicing a detachable bottom plate and a fixed bottom plate. The detachable bottom plate is fixed on the lower end faces of the two detachable support rods, and the fixed bottom plate is fixed on the lower end faces of the fixed support rod and the bottom rod. A quick-release plate is lapped between the detachable support rod and the adjacent two fixed support rods, and the quick-release plate is fixed on the upper end faces of the detachable support rod and the fixed support rod respectively.

[0009] Through the above technical solution, after the street lamp is installed, the fixed bottom plate and the fixed support rod can be removed to facilitate the separation of the present invention from the street lamp.

[0010] Preferably, limit plates are fixed at both ends of the guide rod, and both ends of the sliding plate can be in contact with the limit plates.

[0011] Through the above technical solution, the setting of the limit plates can limit the sliding distance of the sliding plate and limit the sliding plate on the guide rod.

[0012] Preferably, the guide rod is composed of a horizontal part and a vertical part and is in a "T" shape. The support wheel is arranged on the horizontal part. The two side edges of the sliding plate parallel to the length direction of the guide rod are folded down to form a covering plate. A plurality of clamping wheels arranged along the length direction of the guide rod are rotatably connected to the side of the covering plate close to the guide rod, and the outer circumference of the clamping wheel is in contact with the lower side of the horizontal part of the guide rod.

[0013] Through the above technical solution, the sliding plate is covered on the guide rod, so that the sliding plate can only slide along the guide rod.

[0014] Preferably, two first screw rod seats are fixedly arranged on the upper end face of the support rod and are respectively arranged at both ends of the support rod. Two of the first screw rod seats are respectively fixedly arranged on the two outermost fixed support rods. A moving rod is fixed between the two sliding plates. Two first screw rods located at both ends of the moving rod are in threaded connection with the moving rod. The two ends of the first screw rod are respectively rotatably connected in the first screw rod seats. First motors are fixed on both first screw rod seats on the same support rod, and the two first screw rods are respectively fixed on the output shafts of the two first motors.

[0015] Through the above technical solution, the first motor drives the first screw rod to rotate, so that the sliding plate slides along the guide rod. The self-locking effect between the first screw rod and the moving rod enables the moving rod to remain stationary when the first screw rod does not rotate.

[0016] Preferably, a limiting protrusion is fixedly arranged on the inner wall of the bushing, and a limiting block is fixedly arranged at the end of the rotating shaft away from the connecting plate. When the limiting block rotates with the inner clamping plate to a vertical axis, it abuts against the limiting protrusion.

[0017] Through the above technical solution, the setting of the limiting protrusion can limit the rotation angle of the rotating shaft and ensure the stability of the street lamp after it rotates to the vertical state.

[0018] Preferably, two bolts distributed along the axis direction of the arc-shaped clamping plate are fixedly arranged on the upper and lower sides of the fixing plate. The two sides of the arc-shaped clamping plate extending outward in the direction parallel to its axis form a connecting part parallel to the fixing plate. The bolts penetrate through the connecting part of the arc-shaped clamping plate, and nuts abuting against the connecting part of the arc-shaped clamping plate are threadedly connected to the bolts. When the two arc-shaped clamping plates abut against the fixing plate, the axis of the upper arc-shaped clamping plate is located below the fixing plate, and the axis of the lower arc-shaped clamping plate is located above the fixing plate.

[0019] Through the above technical solution, the two arc-shaped clamping plates are fixed on the fixing plate through the threaded connection of the bolts and nuts, so that the two arc-shaped clamping plates can clamp street lamps with different diameters.

[0020] Preferably, a slider seat located at the middle position and parallel to the axis of the arc-shaped clamping plate is fixedly arranged on the outer periphery of the arc-shaped clamping plate. A guiding groove is formed in the slider seat. An inner clamping plate is arranged between the two arc-shaped clamping plates. The curvature of the inner clamping plate is the same as that of the arc-shaped clamping plate. A slider is fixedly arranged on the side of the inner clamping plate close to the arc-shaped clamping plate. The slider is slidably connected in the guiding groove. A second lead screw is threadedly connected in the slider. Both ends of the second lead screw are rotatably connected to the two side walls of the guiding groove. A second motor is fixed at one end of the slider seat. The second lead screw is fixedly connected to the output shaft of the second motor.

[0021] Through the above technical solution, the two inner clamping plates can clamp the street lamp. When the second motor is started, it can drive the inner clamping plate to slide, so that after the street lamp is aligned with the base, it can slowly land on the base.

[0022] The beneficial effects of the present invention are as follows: Place the support frame on the street lamp installation base. The flipping assembly clamps the bottom of the street lamp pole through two arc-shaped clamping plates. The winch cable is fixed to the top of the lamp pole. The lamp pole is pulled from the horizontal state to the vertical state through the winch. Then the street lamp slides along the bottom rod with the column to the street lamp base and is aligned. After loosening the two arc-shaped clamping plates, the street lamp can be installed on the street lamp base, thus replacing the hoisting equipment to hoist the street lamp and reducing the traffic jam caused by road occupation construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the schematic installation position diagram of the present invention; Figure 2 is the schematic structural diagram of the present invention; Figure 3 is the enlarged schematic view of part A in the present invention Figure 2 ; Figure 4 is the enlarged schematic view of part B in the present invention Figure 2 ; Figure 5 is the exploded view of the present invention Figure 6 is the structural schematic view of the inner clamping plate in the present invention Figure 7 is the structural schematic view of the column in the present invention

[0024] In the figure: 10, bottom rod; 11, bottom plate; 11a, dismountable and installable bottom plate; 11b, fixed bottom plate; 20, support rod; 20a, dismountable and installable support rod; 20b, fixed support rod; 21, first lead screw seat; 22, first lead screw; 23, moving rod; 24, first motor; 25, quick-release plate; 30, guide rod; 31, support wheel; 32, limit plate; 40, sliding plate; 401, covering plate; 41, support plate; 42, bushing; 421, limit protrusion; 43, clamping wheel; 50, arc-shaped clamping plate; 51, slider seat; 52, second motor; 53, second lead screw; 54, inner clamping plate; 55, slider; 60, rotating shaft; 601, limit block; 61, connecting plate; 62, fixing plate; 63, bolt; 64, nut. Detailed implementation manners

[0025] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the attached drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. Figure 1

[0026] In order to make the purpose and advantages of the present invention more clear, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention. As used herein, the terms "upper", "lower", "left", and "right" do not limit their strict geometric definitions, but include tolerances for machining or human errors that are reasonable and inconsistent. The specific features of the street lamp erection auxiliary device will be described in detail below: An embodiment of the present invention: Refer to Figures 1 - 7 ​, the present invention provides an auxiliary device for street lamp erection, 1. comprising a support frame, on which two columns are slidably arranged, and a turning assembly for clamping the street lamp is rotatably arranged between the two columns; The support frame comprises two symmetrically arranged bottom rods 10, on the upper end surface of the bottom rod 10, a guide rod 30 is fixed, and a groove is formed in the upper end surface of the guide rod 30 along its length direction, and a plurality of support wheels 31 are rotatably connected in the groove and are equidistantly arranged along its length direction; The column comprises a sliding plate 40, a support plate 41 and a bushing 42, the sliding plate 40 is slidably connected to the guide rod 30 and abuts against the outer periphery of the support wheel 31, the support plate 41 is fixed on the upper end surface of the sliding plate 40, and the bushing 42 is fixed on the upper end of the support plate 41; The turning assembly comprises two symmetrically arranged rotating shafts 60, the rotating shafts 60 are rotatably connected in the bushings 42, on the side of the two rotating shafts 60 close to each other, a connecting plate 61 is fixed, on the side of the two connecting plates 61 close to each other, a fixing plate 62 is fixed, and arc-shaped clamping plates 50 are fixed on the upper and lower end surfaces of the fixing plate 62.

[0027] Refer to Figure 5 , the support frame further comprises four support rods 20 fixed between the two bottom rods 10, two symmetrically arranged bottom plates 11 are arranged on the lower side of the bottom rod 10, the four support rods 20 are respectively fixed on the two bottom plates 11, the upper end surface of the bottom plate 11 abuts against the lower end surface of the bottom rod 10, and the two bottom plates 11 are respectively located at both ends of the bottom rod 10.

[0028] Refer to Figure 2 、 Figure 4 , two of the support rods 20 at one end of the guide rod 30 are formed by splicing a detachable support rod 20a and a fixed support rod 20b, the fixed support rod 20b is fixed on the bottom rod 10, the bottom plate 11 close to the detachable support rod 20a is formed by splicing a detachable bottom plate 11a and a fixed bottom plate 11b, the detachable bottom plate 11a is fixed on the lower end surfaces of the two detachable support rods 20a, the fixed bottom plate 11b is fixed on the fixed support rod 20b and the lower end surface of the bottom rod 10, and a quick-release plate 25 is lapped between the detachable support rod 20a and the adjacent two fixed support rods 20b, and the quick-release plate 25 is respectively fixed on the upper end surfaces of the detachable support rod 20a and the fixed support rod 20b.

[0029] Refer to Figure 2 、 Figure 4 , limit plates 32 are fixed at both ends of the guide rod 30, and both ends of the sliding plate 40 can abut against the limit plates 32.

[0030] Refer to Figure 4 、 Figure 7, the guiding rod 30 is composed of a horizontal part and a vertical part and is in a "T" shape. The supporting wheel 31 is arranged on the horizontal part. The sliding plate 40 is turned downwards along the two sides parallel to the length direction of the guiding rod 30 to form a covering plate 401. A plurality of clamping wheels 43 arranged along the length direction of the guiding rod 30 are rotatably connected to the side of the covering plate 401 close to the guiding rod 30. The outer periphery of the clamping wheel 43 abuts against the lower side of the horizontal part of the guiding rod 30.

[0031] Refer to Figure 2 , Figure 4 , Figure 5 , two first lead screw seats 21 are fixedly arranged on the upper end surface of the support rod 20 and are respectively arranged at both ends of the support rod 20. Among them, the two first lead screw seats 21 are respectively fixedly arranged on the two outermost fixed support rods 20b. A moving rod 23 is fixed between the two sliding plates 40. Two first lead screws 22 located at both ends of the moving rod 23 are in threaded connection with the moving rod 23. The two ends of the first lead screw 22 are respectively rotatably connected in the first lead screw seats 21. First motors 24 are fixed on both first lead screw seats 21 on the same support rod 20. The two first lead screws 22 are respectively fixed on the output shafts of the two first motors 24.

[0032] Refer to Figure 2 , Figure 3 , Figure 5 , a limiting protrusion 421 is fixedly arranged on the inner wall of the bushing 42. The lower end surface of the limiting protrusion 421 is in a horizontal state. The included angle between the upper end surface and the lower end surface of the limiting protrusion 421 is 15° - 30°. A limiting block 601 is fixedly arranged at the end of the rotating shaft 60 far from the connecting plate 61. When the inner clamping plate 54 rotates to make the axis vertical, the limiting block 601 abuts against the limiting protrusion 421. Since the diameter of the street lamp gradually decreases from the bottom to the top, when the limiting block 601 abuts against the upper end surface of the limiting protrusion 421, the axis of the arc-shaped clamping plate 50 inclines downwards, so that the two arc-shaped clamping plates 50 can better clamp the street lamp.

[0033] Refer to Figure 5 , two bolts 63 distributed along the axis direction of the arc-shaped clamping plate 50 are fixedly arranged on the upper and lower side surfaces of the fixing plate 62. The two sides of the arc-shaped clamping plate 50 parallel to its axis direction extend outwards to form a connecting part parallel to the fixing plate 62. The bolt 63 penetrates through the connecting part of the arc-shaped clamping plate 50. A nut 64 that abuts against the connecting part of the arc-shaped clamping plate 50 is in threaded connection with the bolt 63. When the two arc-shaped clamping plates 50 abut against the fixing plate 62, the axis of the upper arc-shaped clamping plate 50 is located below the fixing plate 62, and the axis of the lower arc-shaped clamping plate 50 is located above the fixing plate 62.

[0034] Refer to Figure 5 , Figure 6, a slider seat 51 is fixedly arranged on the outer periphery of the arc-shaped splint 50 at its middle position and is parallel to the axis of the arc-shaped splint 50. A guiding groove is formed in the slider seat 51. An inner splint 54 is arranged between the two arc-shaped splints 50. The curvature of the inner splint 54 is the same as that of the arc-shaped splint 50. A slider 55 is fixedly arranged on the side of the inner splint 54 close to the arc-shaped splint 50. The slider 55 is slidably connected in the guiding groove. A second lead screw 53 is connected to the slider 55 by internal threads. Both ends of the second lead screw 53 are rotatably connected to the two side walls of the guiding groove. One end of the slider seat 51 is fixed with a second motor 52, and the second lead screw 53 is fixedly connected to the output shaft of the second motor 52.

[0035] When the present invention is in use, the flipping assembly is arranged at the end of the guiding rod 30. The present invention is placed on the street lamp base. The guiding rod 30 is parallel to the connecting line of two adjacent bases. Heavy objects can be placed on the upper side of the bottom plate 11 far from the flipping assembly to press the support frame, thereby further increasing the stability of the present invention.

[0036] The street lamp is placed on the side close to the flipping assembly. The street lamp is parallel to the length direction of the guiding rod 30. At this time, the upper arc-shaped splint 50 together with the upper inner splint 54 is removed from the fixing plate 62. Then, the bottom end of the street lamp is lifted, and the bottom end of the street lamp is placed on the lower inner splint 54. Then, the upper arc-shaped splint 50 and the inner splint 54 are clamped on the street lamp, and the nut 64 is tightened to make the two inner splints 54 clamp the bottom end of the street lamp.

[0037] The winch is placed on the other side of the present invention. The cable of the winch is fixed to the lamp post of the street lamp. Then, the winch is started to wind up the pulling rope. At the same time, the operator assists in lifting the street lamp to make the street lamp gradually rotate to the vertical state, and then the winch is turned off.

[0038] Then, the first motor 24 is started to make the first lead screw 22 rotate, thereby driving the moving rod 23 to move along the guiding rod 30, so that the two sliding plates 40 move along the guiding rod 30, thereby driving the street lamp to move along the guiding rod 30 until the street lamp moves directly above the base, and then the first motor 24 is turned off.

[0039] At this time, the second motor 52 is started to make the second lead screw 53 rotate, thereby driving the slider 55 to move downward along the guiding groove, so that the inner splint 54 moves downward, thereby driving the street lamp to move downward onto the base, and then the second motor 52 is turned off.

[0040] After the street lamp is fixed on the base, the inner splint 54 and the arc-shaped splint 50 are removed from the fixing plate 62. Then, the quick-release plate 25 is removed from the disassembly and assembly support rod 20a and the fixed support rod 20b. Subsequently, the fixed bottom plate 11b is separated from the two disassembly and assembly bottom plates 11a, and the fixed support rod 20b is separated from the two disassembly and assembly support rods 20a. At this time, the support frame is moved away from the street lamp to make the present invention separated from the street lamp.

[0041] Those skilled in the art can clearly understand that various modifications can be made to the above embodiments without departing from the general spirit and concept of the present invention. All of them fall within the protection scope of the present invention. The protection scope of the present invention shall be subject to the appended claims of the present invention.

Claims

1. An auxiliary device for street lamp erection, characterized in that: It includes a support frame, on which two columns are slidably arranged, and a flipping assembly for clamping a street lamp is rotatably arranged between the two columns; The support frame includes two symmetrically arranged bottom rods (10), a guide rod (30) is fixed on the upper end surface of the bottom rod (10), a groove is formed in the upper end surface of the guide rod (30) along its length direction, and a plurality of support wheels (31) arranged at equal intervals along its length direction are rotatably connected in the groove; The column includes a sliding plate (40), a support plate (41) and a bushing (42), the sliding plate (40) is slidably connected to the guide rod (30) and abuts against the outer circumference of the support wheel (31), the support plate (41) is fixed on the upper end surface of the sliding plate (40), and the bushing (42) is fixed on the upper end of the support plate (41); The flipping assembly includes two symmetrically arranged rotating shafts (60), the rotating shafts (60) are rotatably connected in the bushings (42), a connecting plate (61) is fixed on each of the two rotating shafts (60) on the side close to each other, a fixing plate (62) is fixed on each of the two connecting plates (61) on the side close to each other, and arc-shaped clamping plates (50) are fixed on the upper and lower end faces of the fixing plate (62).

2. The auxiliary device for street lamp erection according to claim 1, wherein: The support frame further includes four support rods (20) fixed between the two bottom rods (10), two symmetrically arranged bottom plates (11) are arranged on the lower side of the bottom rod (10), the four support rods (20) are respectively fixed on the two bottom plates (11), the upper end surface of the bottom plate (11) abuts against the lower end surface of the bottom rod (10), and the two bottom plates (11) are respectively located at both ends of the bottom rod (10).

3. The auxiliary device for street lamp erection according to claim 2, characterized in that: Two of the support rods (20) located at one end of the guide rod (30) are formed by splicing a detachable support rod (20a) and a fixed support rod (20b), the fixed support rod (20b) is fixed on the bottom rod (10), the bottom plate (11) close to the detachable support rod (20a) is formed by splicing a detachable bottom plate (11a) and a fixed bottom plate (11b), the detachable bottom plate (11a) is fixed on the lower end surfaces of the two detachable support rods (20a), the fixed bottom plate (11b) is fixed on the lower end surfaces of the fixed support rod (20b) and the bottom rod (10), and a quick-release plate (25) is lapped between the detachable support rod (20a) and the adjacent two fixed support rods (20b), and the quick-release plate (25) is respectively fixed on the upper end surfaces of the detachable support rod (20a) and the fixed support rod (20b).

4. An auxiliary device for street lamp erection according to claim 2, characterized in that: Limit plates (32) are fixed at both ends of the guide rod (30), and both ends of the sliding plate (40) can abut against the limit plates (32).

5. The auxiliary device for street lamp erection according to claim 2, wherein: The guide rod (30) is composed of a horizontal part and a vertical part and is in a "T" shape, the support wheels (31) are arranged on the horizontal part, the two side edges of the sliding plate (40) parallel to the length direction of the guide rod (30) are folded downwards to form covering plates (401), and a plurality of clamping wheels (43) arranged along the length direction of the guide rod (30) are rotatably connected to the side of the covering plate (401) close to the guide rod (30), and the outer circumference of the clamping wheel (43) abuts against the lower side surface of the horizontal part of the guide rod (30).

6. The auxiliary device for street lamp erection according to claim 3, characterized in that: On the upper end surface of the support rod (20), two first lead screw seats (21) are fixedly arranged at both ends of the support rod (20). Among them, the two first lead screw seats (21) are respectively fixedly arranged on the two outermost fixed support rods (20b). A moving rod (23) is fixed between the two sliding plates (40). Two first lead screws (22) located at both ends of the moving rod (23) are in threaded connection inside the moving rod (23). The two ends of the first lead screw (22) are respectively rotatably connected inside the first lead screw seat (21). On both of the first lead screw seats (21) on the same support rod (20), a first motor (24) is fixed. The two first lead screws (22) are respectively fixed on the output shafts of the two first motors (24).

7. An auxiliary device for street lamp erection according to claim 1, characterized in that: On the inner wall of the sleeve (42), a limiting protrusion (421) is fixedly arranged. On the end of the rotating shaft (60) far from the connecting plate (61), a limiting block (601) is fixedly arranged. When the limiting block (601) rotates with the inner clamping plate (54) to make its axis vertical, it abuts against the limiting protrusion (421).

8. An auxiliary device for street lamp erection according to claim 7, characterized in that: On the upper and lower side surfaces of the fixed plate (62), two bolts (63) distributed along the axis direction of the arc-shaped clamping plate (50) are fixedly arranged. On both sides of the arc-shaped clamping plate (50) parallel to its axis direction, connection parts parallel to the fixed plate (62) extend outwards. The bolts (63) penetrate through the connection parts of the arc-shaped clamping plate (50). On the bolts (63), nuts (64) in abutment with the connection parts of the arc-shaped clamping plate (50) are in threaded connection. When the two arc-shaped clamping plates (50) are in abutment with the fixed plate (62), the axis of the upper arc-shaped clamping plate (50) is located below the fixed plate (62), and the axis of the lower arc-shaped clamping plate (50) is located above the fixed plate (62).

9. An auxiliary device for street lamp erection according to claim 7, characterized in that: On the outer periphery of the arc-shaped clamping plate (50), a slider seat (51) located at the middle position and parallel to the axis of the arc-shaped clamping plate (50) is fixedly arranged. A guiding groove is formed inside the slider seat (51). An inner clamping plate (54) is arranged between the two arc-shaped clamping plates (50). The curvature of the inner clamping plate (54) is the same as that of the arc-shaped clamping plate (50). On the side of the inner clamping plate (54) close to the arc-shaped clamping plate (50), a slider (55) is fixedly arranged. The slider (55) is slidably connected inside the guiding groove. A second lead screw (53) is in threaded connection inside the slider (55). The two ends of the second lead screw (53) are rotatably connected inside the two side walls of the guiding groove. One end of the slider seat (51) is fixed with a second motor (52). The second lead screw (53) is fixedly connected to the output shaft of the second motor (52).

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