PE filament air cooling device with good cooling effect

Abstract

The invention discloses a PE wire air cooling device with a good cooling effect, which comprises a bracket, a supporting seat is mounted on the bracket, a supporting cylinder capable of exhausting air is fixedly connected to the supporting seat, and a wire penetrating hole is formed in the supporting cylinder in a penetrating manner; the cooling assembly comprises a sleeve rotationally installed in the supporting cylinder, a rotating cylinder capable of producing rotating air and provided with a funnel-shaped inner wall is integrally fixed to the end of the sleeve, and when the rotating cylinder rotates, spiral air can be produced and surrounds the PE wires. According to the device, air in a vortex shape can surround the PE wires, the inner diameter of the rotating cylinder is reduced, the air flows from one end of the rotating cylinder to the direction of the supporting cylinder, and the speed of the air forming the vortex is gradually increased, so that the heat dissipation effect on the PE wires can be gradually improved, too fast or too slow local cooling of the PE wires is effectively avoided, and the service life of the PE wires is prolonged. Therefore, the quality of the stretched PE wires can be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of PE yarn processing, and in particular to a PE yarn air cooling device with good cooling effect. Background Art

[0002] The polyethylene resin produced by the polymerization reaction needs to be extruded through an extruder. An extruder is a device specifically used for plastic processing. It melts the polyethylene resin through heating and pressurizing, and forms the molten polyethylene resin into filaments through the shape of a mold.

[0003] After extrusion, polyethylene monofilaments need to be stretched to increase their strength and toughness. Stretching is usually performed by hot stretching or cold stretching. Hot stretching involves heating the extruded polyethylene monofilaments to a certain temperature and then stretching them mechanically.

[0004] After stretching, the polyethylene monofilament needs to be effectively cooled. It should be noted that effective cooling here does not mean rapid cooling. A good cooling effect is to ensure uniform cooling of the polyethylene monofilament, avoid local cooling that is too fast or too slow, resulting in uneven performance, and then lead to uneven quality of the polyethylene monofilament; for this reason, the present application proposes a PE filament air cooling device with good cooling effect. Summary of the Invention

[0005] The purpose of the present invention is to solve the above technical problems and to propose a PE wire wind cooling device with good cooling effect.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A PE wire wind cooling device with good cooling effect comprises a bracket, a support seat is installed on the bracket, a support cylinder capable of discharging air is fixedly connected to the support seat, and a wire threading hole is penetrated through the support cylinder;

[0008] Cooling component; the cooling component includes a sleeve rotatably installed in a supporting cylinder, and a rotating cylinder with a funnel-shaped inner wall that can produce rotating air is integrally fixed to the end of the sleeve. A plurality of spiral blades are fixed to the inner wall of the rotating cylinder. When the flowing air enters the rotating cylinder and flows on the spiral blades, it can drive the rotating cylinder to rotate. When the rotating cylinder rotates, it can produce spiral air and surround the outside of the PE wire, which can cool the PE wire. As the air flows toward the supporting cylinder, the diameter of the inner wall of the rotating cylinder decreases, and the speed of the air surrounding the PE wire increases.

[0009] Preferably, it also includes an exhaust mechanism that can discharge the air inside the support tube and allow external air to enter the sleeve. The exhaust mechanism includes a first mounting bracket and a second mounting bracket installed on the bracket. The first mounting bracket is equipped with a gearbox, and the second mounting bracket is fixedly equipped with an exhaust fan. One axial end of the gearbox is fixedly connected to the axial end of the exhaust fan through a transmission rod. The air inlet end of the exhaust fan is equipped with an exhaust pipe, and the exhaust pipe passes through the support tube and is fixedly connected to it.

[0010] Preferably, it also includes a movable mechanism that can detect the strength of the PE wire and provide power for the rotation of the gearbox, the movable mechanism includes a mounting platform fixed on the bracket, a driving wheel and two guide wheels are rotatably mounted on the mounting platform, the driving wheel is arranged in the middle and lower part of the two guide wheels, the PE wire passes through the wire threading hole and is wound around the guide wheel, the bottom of the driving wheel and the other guide wheel, a first bevel gear is coaxially fixedly connected to the driving wheel, a second bevel gear is meshed with the first bevel gear, and the second bevel gear is fixedly connected to the shaft end of the gearbox through a rotating rod.

[0011] Preferably, a heat exchange mechanism capable of cooling the rotating cylinder is further included; the heat exchange mechanism comprises two heat exchange sleeves which are sleeved on the rotating cylinder and sealed and fixed, and a connecting sleeve is rotatably connected to the two heat exchange sleeves, and an interlayer into which a medium can be injected is formed between the connecting sleeve, the heat exchange sleeve and the rotating cylinder, and the medium can exchange heat with the rotating cylinder in the interlayer.

[0012] Preferably, it also includes a driving mechanism capable of injecting a medium into the interlayer, the driving mechanism includes a fixed seat and a water tank installed on the bracket, a piston cylinder is installed on the fixed seat, a movable piston is slidably connected in the piston cylinder, a circular plate that can be driven to rotate by a driving wheel is installed on the bracket, a connecting rod is eccentrically hinged on the circular plate, the connecting rod is hingedly connected to the movable piston, a first pipe and a second pipe are installed on the piston cylinder, the first pipe passes through the connecting sleeve and is fixedly connected thereto, the second pipe is connected to the water tank, a first one-way valve is installed on the first pipe, a second one-way valve is installed on the second pipe, and the water tank is connected to the connecting sleeve through a return pipe.

[0013] Preferably, a pressure relief valve is installed on the return pipe.

[0014] Preferably, the first one-way valve only allows the medium to flow into the first pipeline through the piston cylinder, and the second one-way valve only allows the medium to enter the piston cylinder through the second pipeline.

[0015] Preferably, a transmission mechanism is further included, the transmission mechanism includes a first vertical rod and a second vertical rod rotatably installed on the upper end of the support, a third bevel gear is fixed on the first vertical rod, the third bevel gear is engaged with the first bevel gear, transmission wheels are fixed on the first vertical rod and the second vertical rod, and the two transmission wheels are connected through a transmission belt.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. The PE wire is used as power to drive the air extractor, and then the rotating cylinder and the spiral blade are rotated, and the rotating cylinder and the spiral blade rotate to disturb the air, so that the air close to the rotating cylinder is in a vortex state.

[0018] 2. The air flows towards the support cylinder, the inner diameter of the rotating cylinder is reduced, the cross-sectional area of the air flow is compressed, and the rotation speed of the air is increased, that is, the air flows from one end of the rotating cylinder to the support cylinder, and the air speed of the vortex gradually increases, so that the heat dissipation effect on the PE wire can be gradually improved, and the phenomenon of uneven performance caused by too fast or too slow local cooling of the PE wire can be effectively avoided, so that the quality of the PE wire after stretching can be ensured.

[0019] 3. When the moving piston moves close to the circular plate, the water in the water tank is sucked into the piston cylinder through the second pipeline, and when the moving piston moves away from the circular plate, the water in the piston cylinder is conveyed to the interlayer through the first pipeline, and finally the interlayer is filled with water, and the water in the interlayer can be used for heat exchange of the rotating cylinder, so that the rotating cylinder and the spiral blade can be cooled.

[0020] 4. When the cooled PE wire is wound, the PE wire is always in a tension state, so the friction can drive the driving wheel to rotate, and the driving wheel rotates to drive a series of rotations, which will have a certain resistance, if the PE wire breaks during the process, it means that the quality of the PE wire is unqualified, or the cooling effect is not good, and the staff needs to adjust the temperature of the air cooling used during cooling; if the whole process is stable, it means that the quality of the PE wire is qualified, and the cooling effect can meet the use demand.

[0021] 5. If the PE wire breaks during the winding process after cooling, it means that the cooling effect of the part of the PE wire has a problem, which reminds the staff to adjust the cooling assembly (the temperature of the air cooling used during cooling) accordingly.

[0022] In summary, the present application can make the air in a vortex state surround the outside of the PE wire, and since the inner diameter of the rotating cylinder is reduced, the air flows from one end of the rotating cylinder to the support cylinder, and the air speed of the vortex gradually increases, so that the heat dissipation effect on the PE wire can be gradually improved, and the phenomenon of uneven performance caused by too fast or too slow local cooling of the PE wire can be effectively avoided, so that the quality of the PE wire after stretching can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural schematic diagram of a PE wire wind cooling device with good cooling effect proposed by the present invention;

[0024] Figure 2 This is a side view of a PE wire wind cooling device with good cooling effect proposed by the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the piston cylinder in a PE wire wind cooling device with good cooling effect proposed by the present invention;

[0026] Figure 4 This is a side view of the piston cylinder in a PE wire wind cooling device with good cooling effect proposed by the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the spiral blades in a PE filament cooling device with good cooling effect proposed by the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the wire threading hole in a PE wire air cooling device with good cooling effect proposed by the present invention;

[0029] Figure 7 This is a cross-sectional view of a support cylinder in a PE filament air cooling device with good cooling effect proposed by the present invention.

[0030] In the figure: 1 bracket, 2 mounting platform, 3 guide wheel, 4 driving wheel, 5 support cylinder, 6 heat exchange sleeve, 7 connecting sleeve, 8 water tank, 9 first vertical rod, 10 transmission belt, 11 first mounting frame, 12 gearbox, 13 second mounting frame, 14 transmission wheel, 15 second vertical rod, 16 first bevel gear, 17 third bevel gear, 18 second bevel gear, 19 rotating rod, 20 transmission rod, 21 exhaust fan, 22 exhaust pipe, 23 fixed seat, 24 piston cylinder, 25 support seat, 26 rotating cylinder, 27 spiral blade, 28 circular plate, 29 connecting rod, 30 movable piston, 31 pressure relief valve, 32 return pipe, 33 first pipeline, 34 second pipeline, 35 second one-way valve, 36 first one-way valve, 37 threading hole, 38 sleeve. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Reference Figure 1-Figure 7 A PE wire wind cooling device with good cooling effect includes a bracket 1, a support base 25 is installed on the bracket 1, a support cylinder 5 capable of discharging air is fixedly connected to the support base 25, and a wire threading hole 37 is penetrated on the support cylinder 5;

[0033] Cooling assembly; The cooling assembly includes a sleeve 38 rotatably installed in the support cylinder 5. The end of the sleeve 38 is integrally fixed with a rotating cylinder 26 that can produce rotating air and has a funnel-shaped inner wall. A plurality of spiral blades 27 are fixed to the inner wall of the rotating cylinder 26. When the flowing air enters the rotating cylinder 26 and flows on the spiral blades 27, it can drive the rotating cylinder 26 to rotate. When the rotating cylinder 26 rotates, it can produce spiral air and surround the outside of the PE wire, which can cool the PE wire. As the air flows toward the support cylinder 5, the inner wall diameter of the rotating cylinder 26 decreases, and the speed of the air surrounding the PE wire increases.

[0034] Among them, it also includes an exhaust mechanism that can discharge the air inside the support tube 5 and allow external air to enter the sleeve 38. The exhaust mechanism includes a first mounting frame 11 and a second mounting frame 13 installed on the bracket 1. The first mounting frame 11 is equipped with a gearbox 12, and the second mounting frame 13 is fixedly equipped with an exhaust fan 21. One axial end of the gearbox 12 is fixedly connected to the axial end of the exhaust fan 21 through a transmission rod 20. An exhaust pipe 22 is installed at the air inlet end of the exhaust fan 21. The exhaust pipe 22 passes through the support tube 5 and is fixedly connected thereto. When the exhaust fan 21 is working, it can extract and discharge the air in the support tube 5 and the rotating tube 26.

[0035] As another embodiment, it also includes a movable mechanism that can detect the strength of the PE wire and provide power for the rotation of the gearbox 12. The movable mechanism includes a mounting platform 2 fixed on the bracket 1, and a driving wheel 4 and two guide wheels 3 are rotatably mounted on the mounting platform 2. The driving wheel 4 is located below the two guide wheels 3. The PE wire passes through the wire threading hole 37 and is wound around the guide wheel 3, the bottom of the driving wheel 4 and the other guide wheel 3. A first bevel gear 16 is coaxially fixedly connected to the driving wheel 4, and a second bevel gear 18 is meshed with the first bevel gear 16. The second bevel gear 18 is fixedly connected to the shaft end of the gearbox 12 through a rotating rod 19.

[0036] As another embodiment, it also includes a heat exchange mechanism capable of cooling the rotating cylinder 26; the heat exchange mechanism includes two heat exchange sleeves 6 that are sleeved on the rotating cylinder 26 and sealed and fixed, and a connecting sleeve 7 is rotatably connected to the two heat exchange sleeves 6. An interlayer capable of injecting a medium is formed between the connecting sleeve 7, the heat exchange sleeve 6 and the rotating cylinder 26, and the medium can exchange heat with the rotating cylinder 26 in the interlayer.

[0037] As another embodiment, it also includes a driving mechanism capable of injecting a medium into the interlayer, the driving mechanism includes a fixed seat 23 and a water tank 8 mounted on the bracket 1, a piston cylinder 24 is mounted on the fixed seat 23, a movable piston 30 is slidably connected in the piston cylinder 24, a circular plate 28 that can be driven to rotate by the driving wheel 4 is mounted on the bracket 1, a connecting rod 29 is eccentrically hingedly connected to the circular plate 28, the connecting rod 29 is hingedly connected to the movable piston 30, and a first pipe 33 and a second pipe 34 are mounted on the piston cylinder 24. The first pipe 33 passes through the connecting sleeve 7 and is fixedly connected thereto. The second pipe 34 is connected to the water tank 8. A first one-way valve 36 is installed on the first pipe 33, and a second one-way valve 35 is installed on the second pipe 34. The first one-way valve 36 only allows the medium to flow into the first pipe 33 through the piston cylinder 24, and the second one-way valve 35 only allows the medium to enter the piston cylinder 24 through the second pipe 34. The water tank 8 is connected to the connecting sleeve 7 through a return pipe 32, and a pressure relief valve 31 is installed on the return pipe 32.

[0038] It also includes a transmission mechanism, which includes a first vertical rod 9 and a second vertical rod 15 rotatably mounted on the upper end of the bracket 1. A third bevel gear 17 is fixed on the first vertical rod 9, and the third bevel gear 17 is engaged with the first bevel gear 16. A transmission wheel 14 is fixed on the first vertical rod 9 and the second vertical rod 15, and the two transmission wheels 14 are connected by a transmission belt 10.

[0039] When the present invention is used, the stretched PE wire passes through the rotating drum 26 and the wire threading hole 37, and then is wound around the guide wheel 3, the bottom of the driving wheel 4 and another guide wheel 3, and finally the PE wire is wound around the winding wheel. The rotation of the winding wheel can pull and wind up the PE wire.

[0040] When the PE wire is wound on the driving wheel 4, it can drive the driving wheel 4 to rotate. The rotation of the driving wheel 4 drives the first bevel gear 16 to rotate. The rotation of the first bevel gear 16 drives the second bevel gear 18 and the third bevel gear 17 to rotate. The rotation of the second bevel gear 18 drives the rotating rod 19 to rotate. The transmission of the gearbox 12 allows the transmission rod 20 to be quickly transmitted. The transmission rod 20 drives the exhaust fan 21 to work. The exhaust fan 21 can transport and extract the air in the support cylinder 5 and the rotating cylinder 26 through the exhaust pipe 22. In this way, external air enters through the rotating cylinder 26 to dissipate heat for the PE wire being transported;

[0041] When the fast-flowing air enters the rotating cylinder 26, the air is blown onto the spiral blades 27, which is similar to the rotation of the fan when the air blows onto it. The principle is the same, and the spiral blades 27 are shaftless fans; the rotation of the spiral blades 27 drives the rotating cylinder 26 and the sleeve 38 to rotate, and the sleeve 38 rotates in the support cylinder 5; when the rotating cylinder 26 and the spiral blades 27 rotate, the air is disturbed, so that the air near the rotating cylinder 26 is in a vortex shape. Since the inner wall of the rotating cylinder 26 is funnel-shaped, the air speed away from one end of the support cylinder 5 and forming a vortex is low. This vortex air surrounds the moving PE wire, which can take away the heat on the PE wire and can cool the PE wire at a low rate and evenly, so that the heat on the PE wire can be effectively dissipated;

[0042] As the air flows toward the support cylinder 5, the inner diameter of the rotating cylinder 26 decreases, and the cross-sectional area of ​​the air flow is compressed, which increases the speed of the air rotation. In other words, the air flows from one end of the rotating cylinder 26 to the support cylinder 5, and the speed of the air forming the vortex gradually increases. This can gradually improve the heat dissipation effect of the PE filament, effectively avoiding the situation where the PE filament is locally cooled too quickly or too slowly, resulting in uneven performance, thereby ensuring the quality of the PE filament after stretching;

[0043] The rotation of the third bevel gear 17 drives the first vertical rod 9 to rotate, and under the drive of the transmission wheel 14 and the transmission belt 10, the second vertical rod 15 is rotated, thereby driving the circular plate 28 to rotate. The rotation of the circular plate 28 drives the connecting rod 29 to rotate, and the connecting rod 29 drives the movable piston 30 to move back and forth. When the movable piston 30 moves close to the circular plate 28, the water in the water tank 8 can be sucked into the piston cylinder 24 through the second pipe 34. When the movable piston 30 moves away from the circular plate 28, the water in the piston cylinder 24 can be transported to the interlayer through the first pipe 33, and finally fill the interlayer. Since the PE wire is heated and stretched with a moving temperature, the heat transfer of the temperature will cause the temperature of the rotating cylinder 26 and the spiral blade 27 to increase. When the air contacts the rotating cylinder 26 and the spiral blade 27, the air temperature will increase. If it is not effectively curbed, the cooling effect of the PE wire will be reduced, and its quality will be reduced.

[0044] It should be noted that the rotation of the rotating cylinder 26 drives the heat exchange sleeve 6 to rotate, and the heat exchange sleeve 6 and the connecting sleeve 7 rotate relative to each other;

[0045] As the water pressure in the interlayer increases, when the pressure value exceeds the threshold of the pressure relief valve 31, the pressure relief valve 31 opens and the water inside can be transported to the water tank 8 through the return pipe 32, thereby replenishing and replacing the cooling water in the interlayer, so as to better dissipate heat from the rotating drum 26;

[0046] Therefore, the water in the interlayer can exchange heat with the rotating cylinder 26, thereby reducing the temperature of the rotating cylinder 26 and the spiral blades 27;

[0047] Wherein, after cooling, the PE yarn is always in tension state when it is rolled, so the friction can drive the driving wheel 4 to rotate, and the rotation of the driving wheel 4 will have certain resistance, if the PE yarn is broken in this process, it means that the PE yarn is unqualified, or the cooling effect is not good, and the temperature of the air cooling used in the cooling process needs to be adjusted by the staff; if the whole process is stable, it means that the PE yarn is qualified, and the cooling effect can meet the use requirement;

[0048] In addition, if the PE yarn is broken in the rolling process after cooling, it means that the cooling effect of the part of the PE yarn is a problem, reminding the staff to adjust the corresponding cooling component (the temperature of the air cooling used in the cooling process).

[0049] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A PE wire wind cooling device with good cooling effect, comprising a bracket (1), characterized in that: A support seat (25) is installed on the bracket (1), a support cylinder (5) capable of discharging air is fixedly connected to the support seat (25), and a threading hole (37) is provided through the support cylinder (5); A cooling assembly; the cooling assembly includes a sleeve (38) rotatably mounted in a support cylinder (5); a rotating cylinder (26) capable of producing rotating air and having an inner wall in a funnel shape is integrally fixed to the end of the sleeve (38); a plurality of spiral blades (27) are fixed to the inner wall of the rotating cylinder (26); when the flowing air enters the rotating cylinder (26) and flows on the spiral blades (27), the rotating cylinder (26) can be driven to rotate; when the rotating cylinder (26) rotates, spiral air can be produced and surround the outside of the PE wire, thereby cooling the PE wire; as the air flows toward the support cylinder (5), the inner wall diameter of the rotating cylinder (26) decreases, and the speed of the air surrounding the PE wire increases.

2. A PE wire wind cooling device with good cooling effect according to claim 1, characterized in that: The invention also includes an air extraction mechanism capable of discharging air inside the support tube (5) and allowing external air to enter the sleeve (38). The air extraction mechanism includes a first mounting frame (11) and a second mounting frame (13) mounted on the bracket (1). A gearbox (12) is mounted on the first mounting frame (11), and an exhaust fan (21) is fixedly mounted on the second mounting frame (13). One axial end of the gearbox (12) is fixedly connected to the axial end of the exhaust fan (21) through a transmission rod (20). An exhaust pipe (22) is installed at the air inlet end of the exhaust fan (21), and the exhaust pipe (22) passes through the support tube (5) and is fixedly connected thereto.

3. A PE wire wind cooling device with good cooling effect according to claim 2, characterized in that: The invention also includes a movable mechanism capable of detecting the strength of the PE wire and providing power for the rotation of the gearbox (12), the movable mechanism including a mounting platform (2) fixed on the bracket (1), a driving wheel (4) and two guide wheels (3) being rotatably mounted on the mounting platform (2), the driving wheel (4) being arranged below the two guide wheels (3), the PE wire passing through the wire threading hole (37) and then winding around the guide wheel (3), the bottom of the driving wheel (4) and the other guide wheel (3), the driving wheel (4) being coaxially fixedly connected with a first bevel gear (16), the first bevel gear (16) being meshed with a second bevel gear (18), and the second bevel gear (18) being fixedly connected to the shaft end of the gearbox (12) via a rotating rod (19).

4. A PE wire wind cooling device with good cooling effect according to claim 3, characterized in that: The invention also includes a heat exchange mechanism capable of cooling the rotating cylinder (26); the heat exchange mechanism includes two heat exchange sleeves (6) which are sleeved on the rotating cylinder (26) and sealed and fixed, and a connecting sleeve (7) is rotatably connected to the two heat exchange sleeves (6). An interlayer capable of injecting a medium is formed between the connecting sleeve (7), the heat exchange sleeve (6) and the rotating cylinder (26), and the medium can exchange heat with the rotating cylinder (26) in the interlayer.

5. A PE wire wind cooling device with good cooling effect according to claim 4, characterized in that: The invention also includes a driving mechanism capable of injecting a medium into the interlayer, the driving mechanism including a fixed seat (23) and a water tank (8) mounted on the bracket (1), a piston cylinder (24) mounted on the fixed seat (23), a movable piston (30) slidably connected in the piston cylinder (24), a circular plate (28) capable of being driven to rotate by a driving wheel (4) mounted on the bracket (1), a connecting rod (29) eccentrically hingedly connected to the circular plate (28), and the connecting rod (29) and the movable piston (30) are connected in a sliding manner. The piston (30) is hingedly connected. A first pipe (33) and a second pipe (34) are installed on the piston cylinder (24). The first pipe (33) passes through the connecting sleeve (7) and is fixedly connected thereto. The second pipe (34) is connected to the water tank (8). A first one-way valve (36) is installed on the first pipe (33), and a second one-way valve (35) is installed on the second pipe (34). The water tank (8) is connected to the connecting sleeve (7) through a return pipe (32).

6. A PE wire wind cooling device with good cooling effect according to claim 5, characterized in that: A pressure relief valve (31) is installed on the return pipe (32).

7. A PE wire wind cooling device with good cooling effect according to claim 6, characterized in that: The first one-way valve (36) only allows the medium to flow into the first pipe (33) through the piston cylinder (24), and the second one-way valve (35) only allows the medium to enter the piston cylinder (24) through the second pipe (34).

8. The PE wire wind cooling device with good cooling effect according to claim 5, characterized in that: The invention also includes a transmission mechanism, which includes a first vertical rod (9) and a second vertical rod (15) rotatably mounted on the upper end of the bracket (1); a third bevel gear (17) is fixed on the first vertical rod (9); the third bevel gear (17) is meshed with the first bevel gear (16); a transmission wheel (14) is fixed on both the first vertical rod (9) and the second vertical rod (15); and the two transmission wheels (14) are connected via a transmission belt (10).

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