An efficient production device for extruded polystyrene board

Abstract

The present invention relates to the technical field of extruded board production, and provides an efficient production device for extruded polystyrene boards, including a frame, an upper conveying roller group, a lower conveying roller group, a driving mechanism and a cooling box. Both the upper conveying roller group and the lower conveying roller group are composed of a number of forming conveying roller sleeves. A number of fixed rings and a number of rotating rings are arranged at intervals. A coolant ring pipe is fixedly arranged inside the forming conveying roller sleeve. A row of liquid inlet sub-pipes and a row of liquid outlet sub-pipes are arranged on the coolant ring pipe. The liquid outlet sub-pipe on the coolant ring pipe downstream is communicated with the liquid inlet sub-pipe on the adjacent coolant ring pipe upstream. The liquid outlet sub-pipe on the coolant ring pipe at the uppermost upstream is communicated with the coolant return pipe on the cooling box. The liquid inlet sub-pipe on the coolant ring pipe at the lowermost downstream is communicated with the coolant outlet pipe on the cooling box. When the present invention is used, the extruded polystyrene board is gradually cooled and shaped from upstream to downstream to ensure that the shape and size of the extruded board can be stably maintained, avoiding deformation and distortion.

Description

Technical Field

[0001] The present invention relates to the technical field of extruded board production, and in particular to an efficient production device for extruded polystyrene boards. Background Art

[0002] Extruded polystyrene board is a plastic board made of polystyrene material. Because of its characteristics such as light weight, heat insulation, compression resistance, water resistance and corrosion resistance, it is widely used in the fields of construction, refrigeration, packaging, transportation and so on. When using the extruded polystyrene board product, there are relatively high requirements for its size and shape stability. Therefore, it is necessary to cool it in time after the extruded polystyrene board is foamed and extruded to promote its rapid forming, so as to improve the product quality and surface quality.

[0003] In the production process of extruded polystyrene boards, after the soft extruded polystyrene board is extruded, in order to accelerate the cooling and forming efficiency of the extruded board, the soft extruded polystyrene board is contacted with a cold medium for rapid cooling. However, the extruded board will undergo thermal deformation and melting during the extrusion process, and the internal molecular structure is in a very active state. If the soft extruded polystyrene board is directly contacted with the cold medium with a relatively low temperature, it may cause a large temperature difference between the inside and outside of the extruded board, resulting in uneven shrinkage and accumulation of internal stress. Therefore, it is necessary to provide an efficient production device for extruded polystyrene boards, aiming to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide an efficient production device for extruded polystyrene boards, aiming to solve the problems mentioned in the background art.

[0005] To achieve the above object, the present invention provides the following technical solution: an efficient production device for extruded polystyrene boards, including a frame, an upper conveying roller group, a lower conveying roller group, a driving mechanism, and a cooling box. The driving mechanism is installed on the frame, and the driving mechanism is used to rotationally drive the upper conveying roller group and the lower conveying roller group. Both the upper conveying roller group and the lower conveying roller group are composed of a number of forming conveying roller sleeves. The upper conveying roller group and the lower conveying roller group are used for transporting and cooling and forming the extruded polystyrene boards. The forming conveying roller sleeve includes a number of fixed rings and a number of rotating rings, and the number of fixed rings and the number of rotating rings are arranged at intervals. The two sides of the fixed ring are rotationally and cooperatively connected with the end faces of the rotating rings. A coolant ring pipe is fixedly arranged inside the forming conveying roller sleeve, and the coolant ring pipe is filled with coolant. A row of liquid inlet sub-pipes and a row of liquid outlet sub-pipes are arranged on the coolant ring pipe. The liquid outlet sub-pipe on the downstream coolant ring pipe is communicated with the liquid inlet sub-pipe on the adjacent upstream coolant ring pipe. The liquid outlet sub-pipe on the uppermost upstream coolant ring pipe is communicated with the coolant return pipe on the cooling box, and the liquid inlet sub-pipe on the lowermost downstream coolant ring pipe is communicated with the coolant outlet pipe on the cooling box. Both the liquid inlet sub-pipe and the liquid outlet sub-pipe penetrate through the rotating ring and are fixedly connected with the rotating ring. A number of heat-conducting shafts are connected to the outer side surface of the coolant ring pipe, and the outer ends of the heat-conducting shafts are movably connected with heat-conducting balls. The heat-conducting balls are in rolling connection with the inner side surface of the forming conveying roller sleeve. Adjacent two fixed rings are connected by a connecting rod.

[0006] As a further scheme of the present invention, a row of liquid inlet sub-pipes are connected by a liquid inlet shunt pipe, and a row of liquid outlet sub-pipes are connected by a liquid outlet shunt pipe. The center lines of both the liquid inlet shunt pipe and the liquid outlet shunt pipe are parallel to the center line of the forming conveying roller sleeve. The liquid outlet shunt pipe on the downstream coolant ring pipe is connected with the liquid inlet shunt pipe on the adjacent upstream coolant ring pipe through a communicating pipe. The liquid outlet shunt pipe on the uppermost upstream coolant ring pipe is communicated with the coolant return pipe on the cooling box through a liquid outlet main pipe, and the liquid inlet shunt pipe on the lowermost downstream coolant ring pipe is communicated with the coolant outlet pipe on the cooling box through a liquid inlet main pipe.

[0007] As a further scheme of the present invention, the efficient production device for extruded polystyrene boards further includes a fixedly installed first delivery pump and a second delivery pump. The input end of the first delivery pump is communicated with the coolant outlet pipe, and the output end of the first delivery pump is communicated with the liquid inlet main pipe. The input end of the second delivery pump is communicated with the liquid outlet main pipe, and the output end of the second delivery pump is communicated with the coolant return pipe.

[0008] As a further scheme of the present invention, the coolant return pipe is arranged at the bottom of the cooling box, and the coolant outlet pipe is arranged at the top of the cooling box. A cavity is arranged inside the side wall of the cooling box, and a refrigeration system is installed in the cavity. The refrigeration system includes an evaporator, and part of the refrigerant pipes in the evaporator penetrate through the inside of the cooling box, and part of the refrigerant pipes are located at the bottom of the cooling box.

[0009] As a further solution of the present invention, when the coolant ring pipe is part of the upper conveying roller group, the liquid inlet sub-pipe is connected to the bottom of the coolant ring pipe near the upstream direction, and the liquid outlet sub-pipe is connected to the bottom of the coolant ring pipe near the downstream direction; when the coolant ring pipe is part of the lower conveying roller group, the liquid inlet sub-pipe is connected to the top of the coolant ring pipe near the upstream direction, and the liquid outlet sub-pipe is connected to the top of the coolant ring pipe near the downstream direction.

[0010] As a further solution of the present invention, the driving mechanism includes a driving motor and a transmission belt. The driving motor is fixedly mounted on the frame. Both ends of the forming conveying roller sleeve are fixed rings. The outer ends of the fixed rings are connected to disc side plates. The disc side plates are coaxially fixedly connected to rotating shafts. The rotating shafts are connected by transmission belts.

[0011] As a further solution of the present invention, the heat-conducting shaft and the connecting rod are arranged at intervals, the liquid inlet main pipe, the liquid outlet main pipe and the connecting pipe are all connected to the frame through a support rod, the end face of the fixed ring is provided with a convex strip, and the end face of the rotating ring is provided with a groove, and the convex strip is slidably connected with the groove.

[0012] In summary, the beneficial effects of the present invention are:

[0013] By arranging the fixed ring, the rotating ring, the liquid inlet sub-tube, the liquid outlet sub-tube, the forming conveying roller sleeve, the cooling box, the cooling liquid ring tube, the heat-conducting shaft and the heat-conducting ball, when the present invention is used, the extruded polystyrene board will be cooled and shaped step by step from upstream to downstream to ensure that the shape and size of the extruded board can be stably maintained to avoid deformation and distortion, and effectively avoid the problem of large temperature difference between the inside and outside of the extruded board caused by too rapid cooling, causing uneven shrinkage and internal stress accumulation, and the cooling and shaping effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0015] Figure 1 The main three-dimensional structure of an efficient production device for extruded polystyrene board according to an embodiment of the present invention is shown in FIG. Figure 1 .

[0016] Figure 2 The main three-dimensional structure of an efficient production device for extruded polystyrene board according to an embodiment of the present invention is shown in FIG. Figure 2 .

[0017] Figure 3 This is a schematic side view of an efficient production device for extruded polystyrene boards according to an embodiment of the present invention.

[0018] Figure 4 This is an internal view of the forming and conveying roller sleeve in an efficient production device for extruded polystyrene boards according to an embodiment of the present invention.

[0019] Figure 5 It is Figure 1 A partial enlarged schematic view of part A in

[0020] Figure 6 It is Figure 4 A partial enlarged schematic view of part B in

[0021] Figure 7 This is a connection relationship diagram of the rotating ring and the fixed ring according to an embodiment of the present invention.

[0022] Figure 8 This is an internal schematic view of the cooling box according to an embodiment of the present invention.

[0023] Reference numerals: 1 - frame, 2 - rotating shaft, 3 - fixed ring, 4 - rotating ring, 5 - disc side plate, 6 - transmission belt, 7 - driving motor, 8 - total liquid inlet pipe, 9 - total liquid outlet pipe, 10 - inlet shunt pipe, 11 - outlet shunt pipe, 12 - liquid inlet sub - pipe, 13 - liquid outlet sub - pipe, 14 - connecting pipe, 15 - forming and conveying roller sleeve, 16 - cooling box, 17 - first transfer pump, 18 - second transfer pump, 19 - support rod, 20 - refrigerant pipe, 21 - coolant ring pipe, 22 - heat - conducting shaft, 23 - heat - conducting ball, 24 - connecting rod, 25 - convex strip, 27 - coolant outlet pipe, 28 - coolant return pipe. Detailed implementation manners

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] The following describes the specific implementation of the present invention in detail with reference to specific embodiments.

[0026] Please refer to Figures 1 to 8, An efficient production device for extruded polystyrene boards provided by an embodiment of the present invention includes a frame 1, an upper conveying roller group, a lower conveying roller group, a driving mechanism, and a cooling box 16. The cooling box 16 is fixedly installed. When the soft extruded polystyrene board is extruded, it will enter the gap between the upper conveying roller group and the lower conveying roller group. The driving mechanism is fixedly installed on the frame 1, and the driving mechanism is used to rotate and drive the upper conveying roller group and the lower conveying roller group, so as to convey the extruded polystyrene board. Both the upper conveying roller group and the lower conveying roller group are composed of several forming conveying roller sleeves 15. The several forming conveying roller sleeves 15 are linearly arranged. The upper conveying roller group and the lower conveying roller group are used to transport and cool and form the extruded polystyrene board. The forming conveying roller sleeve 15 includes several fixing rings 3 and several rotating rings 4. The several fixing rings 3 and the several rotating rings 4 are arranged at intervals. The two sides of the fixing ring 3 are rotatably connected to the end faces of the rotating rings 4. A coolant ring pipe 21 is fixedly arranged inside the forming conveying roller sleeve 15. The center line of the coolant ring pipe 21 is collinear with the center line of the forming conveying roller sleeve 15. The coolant ring pipe 21 is filled with coolant. A row of liquid inlet sub-pipes 12 and a liquid outlet sub-pipe 13 are arranged on the coolant ring pipe 21. Among them, the liquid outlet sub-pipe 13 on the downstream coolant ring pipe 21 is connected to the liquid inlet sub-pipe 12 on the adjacent upstream coolant ring pipe 21. The upstream and downstream are based on the transportation direction of the extruded polystyrene board. In addition, the liquid outlet sub-pipe 13 on the uppermost upstream coolant ring pipe 21 is connected to the coolant return pipe 28 on the cooling box 16, and the liquid inlet sub-pipe 12 on the lowermost downstream coolant ring pipe 21 is connected to the coolant outlet pipe 27 on the cooling box 16. The liquid inlet sub-pipe 12 and the liquid outlet sub-pipe 13 both penetrate through the rotating ring 4 and are fixedly connected to the rotating ring 4. Several heat conduction shafts 22 are connected to the outer side surface of the coolant ring pipe 21. The outer ends of the heat conduction shafts 22 are movably connected with heat conduction balls 23. The heat conduction balls 23 are in rolling connection with the inner side surface of the forming conveying roller sleeve 15. Adjacent two fixing rings 3 are connected by a connecting rod 24. In this way, the several fixing rings 3 are fixedly connected to each other. Through the arrangement of the heat conduction shafts 22 and the heat conduction balls 23, heat can be quickly conducted between the coolant ring pipe 21 and the forming conveying roller sleeve 15. After the coolant comes out of the cooling box 16, the flow direction is from the downstream coolant ring pipe 21 to the upstream coolant ring pipe 21. And during the flow of the coolant, heat exchange will occur with the extruded polystyrene board, resulting in the lowest temperature of the lowermost downstream forming conveying roller sleeve 15 and the relatively higher temperature of the uppermost upstream forming conveying roller sleeve 15. In this way, the extruded polystyrene board will be gradually cooled and shaped from upstream to downstream to ensure that the shape and size of the extruded board can be stably maintained, avoid deformation and distortion, and effectively avoid the problem of large temperature difference between the inside and outside of the extruded board caused by too rapid cooling, resulting in uneven shrinkage and internal stress accumulation. The cooling and shaping effect is better.

[0027] In an embodiment of the present invention, a row of liquid inlet sub-tubes 12 are connected by a liquid inlet shunt tube 10, and a row of liquid outlet sub-tubes 13 are connected by a liquid outlet shunt tube 11. The center lines of the liquid inlet shunt tube 10 and the liquid outlet shunt tube 11 are both parallel to the center line of the forming conveying roller sleeve 15; the liquid outlet shunt tube 11 on the downstream coolant ring tube 21 is connected to the liquid inlet shunt tube 10 on the adjacent upstream coolant ring tube 21 through a connecting tube 14. The liquid outlet shunt tube 11 on the uppermost upstream coolant ring tube 21 is communicated with the coolant return tube 28 on the cooling tank 16 through a liquid outlet main pipe 9, and the liquid inlet shunt tube 10 on the lowermost downstream coolant ring tube 21 is communicated with the coolant outlet tube 27 on the cooling tank 16 through a liquid inlet main pipe 8. In this way, the flow direction of the coolant from downstream to upstream is ensured. When the coolant ring tube 21 is part of the upper conveying roller group, the liquid inlet sub-tube 12 is connected to the bottom of the coolant ring tube 21 in the upstream direction, and the liquid outlet sub-tube 13 is connected to the bottom of the coolant ring tube 21 in the downstream direction. The bottom of the coolant ring tube 21 is the part that exchanges heat with the extruded polystyrene board. Since the liquid inlet sub-tube 12 is connected to the bottom of the coolant ring tube 21 near the upstream, the coolant will exchange heat as soon as it enters the coolant ring tube 21. Since the liquid outlet sub-tube 13 is connected to the bottom of the coolant ring tube 21 near the downstream, the coolant will flow away immediately after heat exchange, making the heat exchange efficiency higher. Similarly, when the coolant ring tube 21 is part of the lower conveying roller group, the liquid inlet sub-tube 12 is connected to the top of the coolant ring tube 21 in the upstream direction, and the liquid outlet sub-tube 13 is connected to the top of the coolant ring tube 21 in the downstream direction.

[0028] In an embodiment of the present invention, the high-efficiency production device for the extruded polystyrene board further includes a fixedly installed first transfer pump 17 and a second transfer pump 18. The input end of the first transfer pump 17 is communicated with the coolant outlet tube 27, and the output end of the first transfer pump 17 is communicated with the liquid inlet main pipe 8. The input end of the second transfer pump 18 is communicated with the liquid outlet main pipe 9, and the output end of the second transfer pump 18 is communicated with the coolant return tube 28. The settings of the first transfer pump 17 and the second transfer pump 18 ensure the smooth flow of the coolant.

[0029] In an embodiment of the present invention, the coolant return tube 28 is arranged at the bottom of the cooling tank 16, and the coolant outlet tube 27 is arranged at the top of the cooling tank 16. A cavity is arranged inside the side wall of the cooling tank 16, and a refrigeration system, such as the refrigeration system of a refrigerator, is installed in the cavity. The refrigeration system includes an evaporator, and part of the refrigerant tubes 20 in the evaporator penetrate through the inside of the cooling tank 16, and part of the refrigerant tubes 20 are located at the bottom of the cooling tank 16. In this way, the relatively high-temperature coolant flowing back to the cooling tank 16 can be quickly cooled with higher efficiency.

[0030] In an embodiment of the present invention, the driving mechanism includes a driving motor 7 and a transmission belt 6. The driving motor 7 is fixedly installed on the frame 1. Both ends of the forming conveyor roller sleeve 15 are fixed rings 3. The outer ends of the fixed rings 3 are connected with disc side plates 5. A rotating shaft 2 is coaxially and fixedly connected to the disc side plates 5. The output shaft of the driving motor 7 is coaxially and fixedly connected to the rotating shaft 2. The rotating shafts 2 are drivingly connected through the transmission belt 6. Further, the rotating shafts 2 can also be drivingly connected through sprockets and chains.

[0031] In an embodiment of the present invention, the heat-conducting shaft 22 and the connecting rod 24 are arranged at intervals to avoid interference between the two. The liquid inlet main pipe 8, the liquid outlet main pipe 9 and the connecting pipe 14 are all connected to the frame 1 through support rods 19. In this way, the stability of the pipeline is better. The end face of the fixed ring 3 is provided with a convex strip 25, and the end face of the rotating ring is provided with a groove. The convex strip 25 is slidably engaged with the groove.

[0032] The working process of the embodiment of the present invention is as follows: During use, the driving motor 7 is started. When the soft extruded polystyrene board is extruded, it will enter the gap between the upper conveyor roller group and the lower conveyor roller group. The upper conveyor roller group and the lower conveyor roller group will transport the extruded polystyrene board. During the transportation process, from upstream to downstream, the forming conveyor roller sleeve 15 will gradually cool and shape the extruded polystyrene board to ensure that the shape and size of the extruded board can be stably maintained, avoiding deformation and distortion.

[0033] For those skilled in the art, although several embodiments and examples of the present invention are described, these embodiments and examples are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and its equivalents.

[0034] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only includes an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An efficient production device for extruded polystyrene board, comprising a frame (1), an upper conveying roller group, a lower conveying roller group, a driving mechanism and a cooling box (16), wherein the driving mechanism is mounted on the frame (1), and the driving mechanism is used to rotationally drive the upper conveying roller group and the lower conveying roller group, and is characterized in that: The upper conveying roller group and the lower conveying roller group are both composed of a plurality of forming conveying roller sleeves (15), and the upper conveying roller group and the lower conveying roller group are used to transport and cool the extruded polystyrene board; the forming conveying roller sleeve (15) includes a plurality of fixed rings (3) and a plurality of rotating rings (4), the plurality of fixed rings (3) and the plurality of rotating rings (4) are arranged at intervals, and the two sides of the fixed ring (3) are rotatably connected with the end faces of the rotating ring (4); a cooling liquid ring tube (21) is fixedly arranged inside the forming conveying roller sleeve (15), and the cooling liquid ring tube (21) is filled with cooling liquid; a row of liquid inlet sub-tubes (12) and a liquid outlet sub-tube (13) are arranged on the cooling liquid ring tube (21); the liquid outlet sub-tube (13) on the downstream cooling liquid ring tube (21) is connected to the adjacent upstream cooling liquid ring tube (21); The liquid inlet sub-tubes (12) on the ring tube (21) are connected, the liquid outlet sub-tube (13) on the most upstream cooling liquid ring tube (21) is connected to the cooling liquid return pipe (28) on the cooling box (16), and the liquid inlet sub-tube (12) on the most downstream cooling liquid ring tube (21) is connected to the cooling liquid outlet pipe (27) on the cooling box (16). The liquid inlet sub-tube (12) and the liquid outlet sub-tube (13) both penetrate the rotating ring (4) and are fixedly connected to the rotating ring (4). The outer side surface of the cooling liquid ring tube (21) is connected to a plurality of heat-conducting shafts (22). The outer end of the heat-conducting shaft (22) is movably connected to a heat-conducting ball (23). The heat-conducting ball (23) is rollingly connected to the inner side surface of the forming conveying roller sleeve (15). Two adjacent fixed rings (3) are connected via a connecting rod (24).

2. The high-efficiency production device of extruded polystyrene board according to claim 1 is characterized in that: A row of liquid inlet sub-pipes (12) are connected via an inlet branch pipe (10), and a row of liquid discharge sub-pipes (13) are connected via an outlet branch pipe (11), and the center lines of the inlet branch pipe (10) and the outlet branch pipe (11) are parallel to the center line of the forming conveying roller sleeve (15); the outlet branch pipe (11) on the downstream cooling liquid ring pipe (21) is connected to the inlet branch pipe (10) on the adjacent upstream cooling liquid ring pipe (21) via a connecting pipe (14), the outlet branch pipe (11) on the most upstream cooling liquid ring pipe (21) is connected to the cooling liquid return pipe (28) on the cooling box (16) via a liquid outlet main pipe (9), and the inlet branch pipe (10) on the most downstream cooling liquid ring pipe (21) is connected to the cooling liquid outlet pipe (27) on the cooling box (16) via a liquid inlet main pipe (8).

3. The high-efficiency production device of extruded polystyrene board according to claim 2 is characterized in that: The high-efficiency production device of extruded polystyrene board also includes a first delivery pump (17) and a second delivery pump (18) which are fixedly installed, wherein the input end of the first delivery pump (17) is connected to the coolant outlet pipe (27), the output end of the first delivery pump (17) is connected to the liquid inlet main pipe (8), the input end of the second delivery pump (18) is connected to the liquid outlet main pipe (9), and the output end of the second delivery pump (18) is connected to the coolant return pipe (28).

4. The high-efficiency production device of extruded polystyrene board according to claim 2 is characterized in that: The coolant return pipe (28) is arranged at the bottom of the cooling box (16), and the coolant outlet pipe (27) is arranged at the top of the cooling box (16). A cavity is arranged in the side wall of the cooling box (16), and a refrigeration system is installed in the cavity. The refrigeration system includes an evaporator, and part of the refrigerant pipe (20) in the evaporator passes through the interior of the cooling box (16), and part of the refrigerant pipe (20) is located at the bottom of the cooling box (16).

5. The high-efficiency production device of extruded polystyrene board according to claim 1 is characterized in that: When the cooling liquid ring pipe (21) is part of the upper conveying roller group, the liquid inlet sub-pipe (12) is connected to the bottom of the cooling liquid ring pipe (21) in a direction close to the upstream, and the liquid outlet sub-pipe (13) is connected to the bottom of the cooling liquid ring pipe (21) in a direction close to the downstream; when the cooling liquid ring pipe (21) is part of the lower conveying roller group, the liquid inlet sub-pipe (12) is connected to the top of the cooling liquid ring pipe (21) in a direction close to the upstream, and the liquid outlet sub-pipe (13) is connected to the top of the cooling liquid ring pipe (21) in a direction close to the downstream.

6. The high-efficiency production device of extruded polystyrene board according to claim 1 is characterized in that: The driving mechanism comprises a driving motor (7) and a transmission belt (6); the driving motor (7) is fixedly mounted on a frame (1); both ends of the forming conveying roller sleeve (15) are fixed rings (3); the outer ends of the fixed rings (3) are connected to disc side plates (5); the disc side plates (5) are coaxially fixedly connected to rotating shafts (2); and the rotating shafts (2) are connected in transmission via a transmission belt (6).

7. The high-efficiency production device of extruded polystyrene board according to claim 2 is characterized in that: The heat-conducting shaft (22) and the connecting rod (24) are arranged at intervals, the liquid inlet main pipe (8), the liquid outlet main pipe (9) and the connecting pipe (14) are all connected to the frame (1) through a support rod (19), the end surface of the fixed ring (3) is provided with a convex strip (25), the end surface of the rotating ring is provided with a groove, and the convex strip (25) is connected to the groove in a sliding manner.

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