A laser cutting device for processing fitness equipment accessories

Abstract

The present invention discloses a laser cutting device for processing fitness equipment accessories in the technical field of fitness equipment accessories processing, comprising a feeding mechanism for conveying steel pipes; a chuck mechanism for fixing the steel pipes and capable of driving the steel pipes to rotate; a clamping and positioning mechanism, which is arranged on the side of the chuck mechanism and can clamp the ends of the steel pipes and can clean the slag at one end of the steel pipes; a laser cutting mechanism, which is arranged between the chuck mechanism and the clamping and positioning mechanism and can perform cutting work; a feeding mechanism, which is arranged below the clamping and positioning mechanism and can convey the cut steel pipes and clean the slag at the other end of the steel pipes; the present invention can greatly improve the production efficiency of steel pipes.

Description

Technical Field

[0001] The invention relates to the technical field of fitness equipment accessories processing, in particular to laser cutting equipment for fitness equipment accessories processing. Background Art

[0002] In the design and manufacture of fitness equipment, steel pipes are widely used due to their high strength and durability. Therefore, the cutting of steel pipes has become one of the important steps in the production process of fitness equipment. Existing steel pipes are usually cut by laser cutting equipment. During the laser cutting process, the molten material will splash onto the inner and outer walls of the steel pipe. These splashes are attached to the surface of the material and are called slag. The staff will need to clean the slag later. It will take a long time for the slag to be attached to the surface of the material and to be cleaned. After cooling, the slag adheres more firmly, which greatly increases the difficulty of cleaning. In addition, the steel pipe with slag is easy to cause harm to the staff during the transportation process and the staff's picking up process.

[0003] Based on this, the present invention designs a laser cutting device for processing fitness equipment accessories to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a laser cutting device for processing fitness equipment accessories to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a laser cutting device for processing fitness equipment accessories, comprising a feeding mechanism for conveying steel pipes; a chuck mechanism for fixing the steel pipes and capable of driving the steel pipes to rotate; a clamping and positioning mechanism, which is arranged on the side of the chuck mechanism and can clamp the end of the steel pipe and can clean the slag at one end of the steel pipe; a laser cutting mechanism, which is arranged between the chuck mechanism and the clamping and positioning mechanism and can perform cutting work; and a feeding mechanism, which is arranged below the clamping and positioning mechanism and can convey the cut steel pipes and clean the slag at the other end of the steel pipes.

[0006] As a further solution of the present invention, the feeding mechanism includes a plurality of groups of conveying rollers which are equidistantly distributed; the conveying rollers are evenly distributed on both sides of the chuck mechanism.

[0007] As a further solution of the present invention, the clamping and positioning mechanism includes a first chuck, a side of which is provided with a first cylinder capable of driving the first chuck to move in a straight line; the first chuck is elastically and slidingly connected to a plurality of first blocks distributed in a circular array in the radial direction, and the first blocks are fixedly connected to a first traction rope; the first chuck is slidingly connected to a plurality of sliding rods distributed in a circular array in the axial direction, and a plurality of the sliding rods are commonly and fixedly connected to a first slide plate, and a plurality of the first traction ropes are fixedly connected to the first slide plate at one end away from the first block; bristles are installed on the first block; a sleeve is fixedly connected to the first chuck, and the sleeve is coaxially arranged with the first chuck and has bristles densely covered on the inner wall.

[0008] As a further solution of the present invention, a roller is rotatably connected to the first clamping block.

[0009] As a further solution of the present invention, the unloading mechanism includes a protection frame; the protection frame is arranged in a U-shape, and the protection frame is located between the first chuck and the chuck mechanism; a second slide is elastically slidably connected to the protection frame, and the second slide is fixedly connected to the conveying roller; a second traction rope is fixedly connected to the second slide, and the second traction rope is fixedly connected to the first chuck at one end away from the second slide; the first unloading roller is rotatably installed in the protection frame, and the protection frame is elastically slidably connected to the third slide in the vertical direction, and the second unloading roller is rotatably installed on the third slide, and the third slide A third traction rope is fixedly connected to the plate; an L-shaped baffle is elastically and slidably connected to one end of the protection frame near the first chuck, a push rod capable of driving the baffle to move is arranged on the side of the baffle, and the push rod is fixedly connected to the first chuck; a turntable is arranged on the side of the protection frame, and a plurality of cleaning blocks distributed in a circular array are installed on the turntable; a driving assembly capable of driving the turntable to rotate is arranged on the side of the turntable; a mounting seat is rotatably connected to the turntable; an end of the third traction rope away from the third slide plate is fixedly connected to the mounting seat; a second cylinder capable of driving the turntable to make a linear motion is arranged on the side of the mounting seat.

[0010] As a further solution of the present invention, the driving assembly includes a first gear ring, which is fixedly connected to the outer circumferential side wall of the turntable, the first gear ring is meshed with a first gear, a first sprocket is fixedly connected to the rotating shaft of the first gear, the first sprocket is connected to the second sprocket through a chain transmission, and the chuck mechanism can drive the second sprocket to rotate synchronously when driving the steel pipe to rotate.

[0011] As a further solution of the present invention, the cleaning block is composed of two symmetrically arranged sliders, bristles are installed on the opposite side walls of the two sliders, the two sliders are slidably connected to the turntable, the turntable is rotatably connected to a bidirectional threaded rod, and the two sliders are respectively threadedly connected to the two ends of the bidirectional threaded rod; a first bevel gear is fixedly connected to the rotating shaft of the bidirectional threaded rod, the first bevel gear is meshed with a second bevel gear, and the second bevel gear is rotatably connected to the turntable; the rotating shaft of the second bevel gear extends to the outside of the turntable and is fixedly connected to a twist block.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The present invention can clean the slag attached to the inner and outer walls of both ends of the steel pipe after cutting by arranging the clamping positioning mechanism and the unloading mechanism. The staff does not need to clean the slag subsequently, which can save the steel pipe production steps and improve the production efficiency. Moreover, during the steel pipe unloading process, the cleaned slag can be discharged outside the steel pipe, which can better prevent the slag from scratching the steel pipe and the staff during the steel pipe transportation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the structure of the clamping and positioning mechanism of the present invention;

[0016] Figure 3 It is a schematic cross-sectional view of the structure of the clamping and positioning mechanism of the present invention;

[0017] Figure 4 It is a schematic diagram of the structure of the blanking mechanism of the present invention;

[0018] Figure 5 It is a schematic cross-sectional view of the structure of the blanking mechanism of the present invention;

[0019] Figure 6 This is a schematic diagram of the structure of the drive assembly of the present invention;

[0020] Figure 7 It is a schematic cross-sectional view of the cleaning block structure of the present invention.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] Feeding mechanism 1, conveying roller 11, chuck mechanism 2, clamping and positioning mechanism 3, first chuck 31, first cylinder 32, first clamping block 33, first traction rope 34, slide bar 35, first slide plate 36, sleeve 37, roller 38, laser cutting mechanism 4, unloading mechanism 5, protective frame 51, second slide plate 52, second traction rope 53, first unloading roller 54, third slide plate 55, third traction rope 56, baffle 57, push rod 58, turntable 59, cleaning block 60, mounting seat 61, second cylinder 62, first gear ring 63, first gear 64, first sprocket 65, chain 66, second sprocket 67, slider 68, bidirectional threaded rod 69, first bevel gear 70, second bevel gear 71, screw block 72, second unloading roller 73. DETAILED DESCRIPTION

[0023] See also Figure 1-Figure 7 The present invention provides a technical solution: a laser cutting device for processing fitness equipment accessories, comprising a feeding mechanism 1 for conveying a steel pipe; a chuck mechanism 2 for fixing the steel pipe and driving the steel pipe to rotate; a clamping and positioning mechanism 3, which is arranged on the side of the chuck mechanism 2 and can clamp the end of the steel pipe and can clean the slag at one end of the steel pipe; a laser cutting mechanism 4, which is arranged between the chuck mechanism 2 and the clamping and positioning mechanism 3 and can perform cutting work; a feeding mechanism 5, which is arranged below the clamping and positioning mechanism 3 and can convey the cut steel pipe and clean the slag at the other end of the steel pipe.

[0024] When working, Figure 1 As shown, when it is necessary to cut the long steel pipe, the feeding mechanism 1 transports the steel pipe to the side close to the clamping and positioning mechanism 3. After the steel pipe passes through the chuck mechanism 2 and the end is located a short distance to the left of the laser cutting mechanism 4, the laser cutting mechanism 4 starts to work, the chuck mechanism 2 clamps the steel pipe and drives the steel pipe to rotate one circle, and the laser cutting mechanism 4 cuts off a small part of the end of the steel pipe to keep the end of the steel pipe flat; after the laser cutting mechanism 4 stops working, the feeding mechanism 1 transports the end of the cut steel pipe to the clamping and positioning mechanism 3, and the clamping and positioning mechanism 3 clamps the end of the steel pipe. At this time, the length of the steel pipe on the left side of the laser cutting mechanism 4 is the required length of the steel pipe; then the chuck mechanism 2 drives the steel pipe to rotate for laser cutting, and the clamping and positioning mechanism 3 cleans the slag on the inner and outer walls of the left end of the steel pipe when the steel pipe rotates; after the steel pipe is cut, the steel pipe will fall into the unloading mechanism 5, and the unloading mechanism 5 will clean the slag at the incision at the right end of the steel pipe and then transport it to the next station for the next step of processing.

[0025] As a further solution of the present invention, the feeding mechanism 1 includes a plurality of groups of conveying rollers 11 which are equidistantly distributed; the conveying rollers 11 are evenly distributed on both sides of the chuck mechanism 2 .

[0026] When working, Figure 1 and Figure 4 As shown, the steel pipe can be driven to move horizontally by the rotation of the conveying roller 11.

[0027] As a further solution of the present invention, the clamping and positioning mechanism 3 includes a first chuck 31, and a first cylinder 32 capable of driving the first chuck 31 to move in a straight line is arranged on the side thereof; the first chuck 31 is elastically and slidingly connected with a plurality of first blocks 33 distributed in a circular array in the radial direction, and the first blocks 33 are all fixedly connected with a first traction rope 34; the first chuck 31 is slidingly connected with a plurality of slide rods 35 distributed in a circular array in the axial direction, and the plurality of slide rods 35 are commonly and fixedly connected with a first slide plate 36, and the plurality of first traction ropes 34 are fixedly connected with the first slide plate 36 at one end away from the first block 33; bristles are installed on the first block 33; a sleeve 37 is fixedly connected to the first chuck 31, and the sleeve 37 is coaxially arranged with the first chuck 31 and has bristles densely covered on the inner wall.

[0028] When working, Figure 2 and Figure 3 As shown, when the steel pipe moves to the left under the drive of the feeding mechanism 1, the outer circumferential side wall of the steel pipe will first contact the bristles arranged on the inner wall of the sleeve 37. The length of the bristles can be set according to actual conditions. In order to make the bristles contact with the outer circumferential side wall of the steel pipe, the bristles can be long but not too short. After the left side wall of the steel pipe moves to contact with the slide bar 35, the steel pipe will drive the slide bar 35 to move to the left, and the slide bar 35 will drive the first slide plate 36 to move to the left synchronously. The first slide plate 36 will drive the first block 33 to move outward through the first traction rope 34, and multiple first blocks 33 will move outward synchronously until multiple first blocks 33 are 33 are all moved to contact with the inner circumferential side wall of the steel pipe, the left end of the steel pipe is fixed by multiple first clamping blocks 33, and the bristles arranged on the first clamping blocks 33 will contact with the inner circumferential side wall of the steel pipe; then during the rotational cutting process of the steel pipe, the bristles on the inner wall of the sleeve 37 and the bristles on the first clamping blocks 33 will respectively clean up the slag attached to the outer and inner circumferential side walls of the steel pipe; the present invention is provided with a clamping and positioning mechanism 3, the clamping and positioning mechanism 3 can clamp the left end of the steel pipe, and at the same time clean up the slag attached to the inner and outer side walls of the left end of the steel pipe; and the first clamping block 33 can be suitable for clamping steel pipes of different diameters.

[0029] As a further solution of the present invention, a roller 38 is rotatably connected to the first clamping block 33 .

[0030] When working, Figure 3 As shown, when the steel pipe is rotated for cutting, the roller 38 can replace the first clamping block 33 to contact the inner wall of the steel pipe, so that the steel pipe can rotate more smoothly and the slag on the inner wall of the steel pipe can be better cleaned.

[0031] As a further solution of the present invention, the unloading mechanism 5 includes a protective frame 51; the protective frame 51 is set to a U-shape, and the protective frame 51 is located between the first chuck 31 and the chuck mechanism 2; the protective frame 51 is elastically slidably connected to the second slide plate 52, and the second slide plate 52 is fixedly connected to the conveying roller 11; the second slide plate 52 is fixedly connected to the second traction rope 53, and the second traction rope 53 is fixedly connected to the first chuck 31 at one end away from the second slide plate 52; a first unloading roller 54 is rotatably installed in the protective frame 51, and the protective frame 51 is elastically slidably connected to the third slide plate 55 in the vertical direction, and a second unloading roller 73 is rotatably installed on the third slide plate 55, and the third slide plate A third traction rope 56 is fixedly connected to 55; an L-shaped baffle plate 57 is elastically slidably connected to one end of the protection frame 51 close to the first chuck 31, and a push rod 58 capable of driving the baffle plate 57 to move is arranged on the side of the baffle plate 57, and the push rod 58 is fixedly connected to the first chuck 31; a turntable 59 is arranged on the side of the protection frame 51, and a plurality of cleaning blocks 60 distributed in a circular array are installed on the turntable 59; a driving component capable of driving the turntable 59 to rotate is arranged on the side of the turntable 59; a mounting seat 61 is rotatably connected to the turntable 59; the end of the third traction rope 56 away from the third slide plate 55 is fixedly connected to the mounting seat 61; a second cylinder 62 capable of driving it to make a linear motion is arranged on the side of the mounting seat 61.

[0032] The driving assembly includes a first gear ring 63, which is fixedly connected to the outer circumferential side wall of the turntable 59. The first gear ring 63 is meshed with a first gear 64. A first sprocket 65 is fixedly connected to the rotating shaft of the first gear 64. The first sprocket 65 is connected to a second sprocket 67 through a chain 66. When the chuck mechanism 2 drives the steel pipe to rotate, it can drive the second sprocket 67 to rotate synchronously.

[0033] When working, Figure 1 , Figure 4-Figure 6As shown, when the steel pipe is cut, the clamping and positioning mechanism 3 moves to the left, so that the first clamping block 33 cancels the clamping of the steel pipe; at the same time, the first chuck 31 will drive the second slide plate 52 to move outward through the second traction rope 53, and the second slide plate 52 will drive the conveying roller 11 to move outward synchronously; after the first clamping block 33 moves to the left to the left side of the steel pipe, the conveying roller 11 also moves to the outside of the steel pipe, and then the steel pipe falls downward under the action of its own gravity; it should be noted that when the first chuck 31 moves to the left, it will drive the baffle 57 to move to the left synchronously through the push rod 58, and at this time the cleaning block 60 is at The steel pipe is located directly below the right end of the steel pipe, so the right end of the steel pipe will be blocked by the cleaning block 60 during the downward falling process. When the right end of the steel pipe contacts the cleaning block 60, the left end will tilt downward. At this time, the slag cleaned inside the left end of the steel pipe can fall quickly from the left side, which can ensure that the slag will not remain inside the steel pipe; then the steel pipe will slide to the left until it slides to a horizontal position. At this time, the steel pipe is on the first unloading roller 54 and the second unloading roller 73 and is located on the left side of the cleaning block 60; then after the first chuck 31 moves to the right to the initial position, the baffle 57 will The steel pipe is pushed to move rightward, and the baffle 57 cooperates with the turntable 59 to clamp the steel pipe; when the laser cutting mechanism 4 drives the steel pipe to rotate, it drives the first sprocket 65 to rotate synchronously through the second sprocket 67 and the chain 66, and the first sprocket 65 drives the first gear ring 63 to rotate synchronously through the first gear 64, and the first gear ring 63 drives the turntable 59 and the cleaning block 60 to do circular motion, and the cleaning block 60 cleans the slag on the inner and outer walls of the steel pipe; after the cleaning is completed, the second cylinder 62 drives the mounting seat 61, the turntable 59 and the cleaning block 60 to move rightward synchronously, and the mounting seat 61 is pulled by the third traction rope 56 The third slide plate 55 is driven to move downward, and the third slide plate 55 will drive the second feeding roller 73 to move downward synchronously. At this time, the first feeding roller 54 is located above the second feeding roller 73, so the steel pipe will tilt to the right, and the slag cleaned off the right end of the steel pipe can quickly fall from the right side, which can better ensure that the slag will not remain inside the steel pipe and prevent the slag from causing damage to the steel pipe and the staff during the steel pipe transportation process; after the steel pipe falls from the second feeding roller 73 to the next processing station, the second cylinder 62 drives the mounting seat 61, the turntable 59 and the cleaning block 60 to move left to the initial position.

[0034] As a further solution of the present invention, the cleaning block 60 is composed of two symmetrically arranged sliders 68, and bristles are installed on the opposite side walls of the two sliders 68. The two sliders 68 are slidably connected to the turntable 59, and the turntable 59 is rotatably connected with a bidirectional threaded rod 69, and the two sliders 68 are respectively threadedly connected to the two ends of the bidirectional threaded rod 69; a first bevel gear 70 is fixedly connected to the rotating shaft of the bidirectional threaded rod 69, and the first bevel gear 70 is meshed with a second bevel gear 71, and the second bevel gear 71 is rotatably connected to the turntable 59; the rotating shaft of the second bevel gear 71 extends to the outside of the turntable 59 and is fixedly connected with a screw block 72.

[0035] When working, Figure 7 As shown, rotating the screw block 72 can drive the second bevel gear 71 to rotate synchronously, and the second bevel gear 71 can drive the bidirectional threaded rod 69 to rotate synchronously through the first bevel gear 70, and the bidirectional threaded rod 69 can drive the two sliders 68 to move toward or away from each other, thereby adjusting the distance between the two sliders 68, which can be better suitable for slag cleaning of steel pipes of different thicknesses; when the baffle 57 pushes the steel pipe to the right to contact with the turntable 59, the steel pipe will be inserted between the two sliders 68, and the bristles on the two sliders 68 will contact the inner and outer side walls of the steel pipe respectively, and then the rotation of the turntable 59 can drive the sliders 68 to rotate synchronously, and the bristles on the sliders 68 can clean the slag attached to the inner and outer side walls of the steel pipe.

[0036] Working principle: Figure 1 As shown, when it is necessary to cut the long steel pipe, the feeding mechanism 1 transports the steel pipe to the side close to the clamping and positioning mechanism 3. After the steel pipe passes through the chuck mechanism 2 and the end is located a short distance to the left of the laser cutting mechanism 4, the laser cutting mechanism 4 starts to work, the chuck mechanism 2 clamps the steel pipe and drives the steel pipe to rotate one circle, and the laser cutting mechanism 4 cuts off a small part of the end of the steel pipe to keep the end of the steel pipe flat; after the laser cutting mechanism 4 stops working, the feeding mechanism 1 transports the end of the cut steel pipe to the clamping and positioning mechanism 3, and the clamping and positioning mechanism 3 clamps the end of the steel pipe. At this time, the length of the steel pipe on the left side of the laser cutting mechanism 4 is the required length of the steel pipe; then the chuck mechanism 2 drives the steel pipe to rotate for laser cutting, and the clamping and positioning mechanism 3 cleans the slag on the inner and outer walls of the left end of the steel pipe when the steel pipe rotates; after the steel pipe is cut, the steel pipe will fall into the unloading mechanism 5, and the unloading mechanism 5 will clean the slag at the incision at the right end of the steel pipe and then transport it to the next station for the next step of processing.

Claims

1. A laser cutting device for processing fitness equipment accessories, Features: include A feeding mechanism (1) for conveying steel pipes; A chuck mechanism (2), used to fix the steel pipe and capable of driving the steel pipe to rotate; A clamping and positioning mechanism (3) is arranged on the side of the chuck mechanism (2) and is capable of clamping the end of the steel pipe and cleaning slag at one end of the steel pipe; A laser cutting mechanism (4) is arranged between the chuck mechanism (2) and the clamping and positioning mechanism (3) and is capable of performing a cutting operation; A feeding mechanism (5) is arranged below the clamping and positioning mechanism (3) and is capable of conveying the cut steel pipe and cleaning the slag at the other end of the steel pipe; The feeding mechanism (1) comprises a plurality of groups of conveying rollers (11) which are distributed at equal intervals; the conveying rollers (11) are evenly distributed on both sides of the chuck mechanism (2); The clamping and positioning mechanism (3) comprises a first chuck (31), and a first cylinder (32) capable of driving the first chuck (31) to move linearly is arranged on a side thereof; the first chuck (31) is elastically and slidably connected to a plurality of first clamping blocks (33) distributed in a circumferential array in a radial direction, and the first clamping blocks (33) are all fixedly connected to a first traction rope (34); the first chuck (31) is slidably connected to a plurality of sliding rods (35) distributed in a circumferential array in an axial direction, and the plurality of sliding rods (35) are commonly and fixedly connected to a first slide plate (36), and the ends of the plurality of first traction ropes (34) away from the first clamping block (33) are all fixedly connected to the first slide plate (36); bristles are installed on the first clamping block (33); a sleeve (37) is fixedly connected to the first chuck (31), and the sleeve (37) is coaxially arranged with the first chuck (31) and has bristles densely distributed on its inner wall; The unloading mechanism (5) comprises a protection frame (51); the protection frame (51) is arranged in a U-shape, and the protection frame (51) is located between the first chuck (31) and the chuck mechanism (2); a second slide plate (52) is elastically slidably connected to the protection frame (51), and the second slide plate (52) is fixedly connected to the conveying roller (11); a second traction rope (53) is fixedly connected to the second slide plate (52), and the second traction rope (53) is fixedly connected to the first chuck (31) at one end away from the second slide plate (52); a first unloading roller (54) is rotatably mounted in the protection frame (51), and a third slide plate (55) is elastically slidably connected to the protection frame (51) in a vertical direction, and a second unloading roller (73) is rotatably mounted on the third slide plate (55), and the third slide plate (55) is fixedly mounted on the second traction rope (53). A third traction rope (56) is fixedly connected; an L-shaped baffle (57) is elastically slidably connected to one end of the protection frame (51) near the first chuck (31); a push rod (58) capable of driving the baffle (57) to move is arranged on the side of the baffle (57); the push rod (58) is fixedly connected to the first chuck (31); a turntable (59) is arranged on the side of the protection frame (51), and a plurality of cleaning blocks (60) distributed in a circular array are installed on the turntable (59); a driving assembly capable of driving the turntable (59) to rotate is arranged on the side of the turntable (59); the turntable (59) is rotatably connected to a mounting seat (61); an end of the third traction rope (56) away from the third slide plate (55) is fixedly connected to the mounting seat (61); a second cylinder (62) capable of driving the mounting seat (61) to perform linear motion is arranged on the side of the mounting seat (61).

2. A laser cutting device for processing fitness equipment accessories according to claim 1, Features: A roller (38) is rotatably connected to the first clamping block (33).

3. The laser cutting device for processing fitness equipment accessories according to claim 1, Features: The driving assembly comprises a first gear ring (63), the first gear ring (63) being fixedly connected to the outer circumferential side wall of the rotating disk (59), the first gear ring (63) being meshed with a first gear (64), a first sprocket (65) being fixedly connected to the rotating shaft of the first gear (64), the first sprocket (65) being connected to a second sprocket (67) via a chain (66), and the chuck mechanism (2) can drive the second sprocket (67) to rotate synchronously when driving the steel pipe to rotate.

4. The laser cutting device for processing fitness equipment accessories according to claim 1, Features: The cleaning block (60) is composed of two symmetrically arranged sliders (68), bristles are installed on opposite side walls of the two sliders (68), the two sliders (68) are slidably connected to the rotating disk (59), the rotating disk (59) is rotatably connected to a bidirectional threaded rod (69), and the two sliders (68) are respectively threadedly connected to the two ends of the bidirectional threaded rod (69); a first bevel gear (70) is fixedly connected to the rotating shaft of the bidirectional threaded rod (69), the first bevel gear (70) is meshed with a second bevel gear (71), and the second bevel gear (71) is rotatably connected to the rotating disk (59); the rotating shaft of the second bevel gear (71) extends to the outside of the rotating disk (59) and is fixedly connected to a screw block (72).

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