Efficient production device for extruded polystyrene board

Abstract

The invention relates to the technical field of extruded sheet production, and provides an efficient production device for an extruded polystyrene board, the efficient production device comprises a rack, an upper conveying roller set, a lower conveying roller set, a driving mechanism and a cooling box, the upper conveying roller set and the lower conveying roller set are each composed of a plurality of forming conveying roller sleeves, and a plurality of fixing rings and a plurality of rotating rings are arranged at intervals; a cooling liquid annular pipe is fixedly arranged in the forming conveying roller sleeve, a row of liquid inlet sub-pipes and a row of liquid outlet sub-pipes are arranged on the cooling liquid annular pipe, and the liquid outlet sub-pipes on the downstream cooling liquid annular pipe are communicated with the liquid inlet sub-pipes on the adjacent upstream cooling liquid annular pipe. The liquid outlet sub-pipe on the most upstream cooling liquid ring pipe is communicated with the cooling liquid return pipe on the cooling box, and the liquid inlet sub-pipe on the most downstream cooling liquid ring pipe is communicated with the cooling liquid outlet pipe on the cooling box. When the device is used, the extruded polystyrene board can be cooled and shaped step by step from the upstream to the downstream, so that the shape and the size of the extruded board can be stably kept, and deformation and distortion are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of extruded board production, in particular to a high-efficiency production device for extruded polystyrene boards. Background Art

[0002] Extruded polystyrene board is a plastic board made of polystyrene material. It is widely used in construction, refrigeration, packaging, transportation and other fields because of its light weight, heat insulation, pressure resistance, water resistance and corrosion resistance. When using extruded polystyrene board products, there are high requirements for their size and shape stability. Therefore, it is necessary to cool the extruded polystyrene board in time after foaming and extrusion to promote its rapid molding and improve product quality and surface quality.

[0003] In the production process of extruded polystyrene board, after the soft extruded board is extruded, in order to speed up the cooling and molding efficiency of the extruded board, the soft extruded board will be contacted with a cold medium for rapid cooling. However, the extruded board will be thermally deformed and melted during the extrusion process, and the internal molecular structure is in a very active state. If the soft extruded board is directly exposed to a cold medium with a lower temperature, it may cause a large temperature difference between the inside and outside of the extruded board, thereby causing uneven shrinkage and accumulation of internal stress. Therefore, it is necessary to provide an efficient production device for extruded polystyrene board 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 technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an efficient production device for extruded polystyrene board, comprising a frame, an upper conveying roller group, a lower conveying roller group, a driving mechanism and a cooling box, wherein 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, and the upper conveying roller group and the lower conveying roller group are both composed of a plurality of forming conveying roller sleeves, 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 comprises a plurality of fixed rings and a plurality of rotating rings, and the plurality of fixed rings and the plurality of rotating rings are arranged at intervals, and the two sides of the fixed ring are rotatably connected with the end faces of the rotating rings, and the interior of the forming conveying roller sleeve is fixedly provided with a cooling liquid The ring tube, the coolant ring tube is filled with coolant, and a row of liquid inlet sub-tubes and a liquid outlet sub-tube are arranged on the coolant ring tube. The liquid outlet sub-tube on the downstream coolant ring tube is connected with the liquid inlet sub-tube on the adjacent upstream coolant ring tube, the liquid outlet sub-tube on the upstream coolant ring tube is connected with the coolant return pipe on the cooling box, and the liquid inlet sub-tube on the downstream coolant ring tube is connected with the coolant outlet pipe on the cooling box. The liquid inlet sub-tube and the liquid outlet sub-tube both pass through the rotating ring and are fixedly connected to the rotating ring. A plurality of heat-conducting shafts are connected to the outer side surface of the coolant ring tube, and a heat-conducting ball is movably connected to the outer end of the heat-conducting shaft. The heat-conducting ball is rollingly connected to the inner side surface of the forming conveying roller sleeve, and two adjacent 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 an inlet branch pipe, and a row of liquid discharge sub-pipes are connected by an outlet branch pipe, and the center lines of the inlet branch pipe and the outlet branch pipe are parallel to the center line of the forming conveying roller sleeve; the outlet branch pipe on the downstream coolant ring pipe is connected to the inlet branch pipe on the adjacent upstream coolant ring pipe through a connecting pipe, the outlet branch pipe on the most upstream coolant ring pipe is connected to the coolant return pipe on the cooling box through the liquid outlet main pipe, and the inlet branch pipe on the most downstream coolant ring pipe is connected to the coolant outlet pipe on the cooling box through the liquid inlet main pipe.

[0007] As a further solution of the present invention, the efficient production device of extruded polystyrene board also includes a first fixedly installed delivery pump and a second delivery pump, the input end of the first delivery pump is connected to the coolant outlet pipe, the output end of the first delivery pump is connected to the liquid inlet main pipe, the input end of the second delivery pump is connected to the liquid outlet main pipe, and the output end of the second delivery pump is connected to the coolant return pipe.

[0008] As a further solution of the present invention, the coolant return pipe is arranged at the bottom of the cooling box, the coolant outlet pipe is arranged at the top of the cooling box, a cavity is arranged in the side wall of the cooling box, a refrigeration system is installed in the cavity, the refrigeration system includes an evaporator, some refrigerant pipes in the evaporator pass through the interior of the cooling box, and some 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: 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

[0013] 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: 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 .

[0014] 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 .

[0015] Figure 3This is a schematic side structural diagram of an efficient production device for extruded polystyrene boards according to an embodiment of the present invention.

[0016] Figure 4 This is an internal diagram of a forming and conveying roller sleeve in a high-efficiency production device for extruded polystyrene boards according to an embodiment of the present invention.

[0017] Figure 5 for Figure 1 A local enlarged schematic diagram of point A in the middle.

[0018] Figure 6 for Figure 4 A local enlarged schematic diagram of point B in the middle.

[0019] Figure 7 1 is a diagram showing the connection relationship between the rotating ring and the fixed ring in an embodiment of the present invention.

[0020] Figure 8 Schematic diagram of the interior of the cooling box in the embodiment of the present invention.

[0021] Figure markings: 1-frame, 2-rotating shaft, 3-fixed ring, 4-rotating ring, 5-disc side plate, 6-transmission belt, 7-drive motor, 8-liquid inlet main pipe, 9-liquid outlet main pipe, 10-inlet shunt pipe, 11-outlet shunt pipe, 12-liquid inlet sub-pipe, 13-liquid outlet sub-pipe, 14-connecting pipe, 15-molding conveying roller sleeve, 16-cooling box, 17-first conveying pump, 18-second conveying pump, 19-support rod, 20-refrigerant pipe, 21-cooling liquid ring pipe, 22-heat conduction shaft, 23-heat conduction ball, 24-connecting rod, 25-convex strip, 27-cooling liquid outlet pipe, 28-cooling liquid return pipe. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with 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.

[0023] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0024] See also Figures 1 to 8An embodiment of the present invention provides an efficient production device for extruded polystyrene board, including 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, thereby conveying the extruded polystyrene board. 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 plurality of forming conveying roller sleeves 15 are arranged linearly. 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, and the plurality of fixed rings 3 and the plurality of rotating rings 4 are arranged at intervals. The two sides of the fixed ring 3 are rotatably connected with the end faces of the rotating ring 4. A cooling liquid ring pipe 21 is fixedly arranged inside the forming conveying roller sleeve 15. The center line of the cooling liquid ring pipe 21 is arranged colinearly with the center line of the forming conveying roller sleeve 15. The cooling liquid ring pipe 21 is filled with cooling liquid. A row of liquid inlet sub-tubes 12 and a liquid discharge sub-tube 13 are arranged on the cooling liquid ring pipe 21, wherein the liquid outlet sub-tube 13 on the downstream cooling liquid ring pipe 21 is connected to the liquid inlet sub-tube 12 on the adjacent upstream cooling liquid ring pipe 21, and the upstream and downstream are based on the transportation direction of the extruded polystyrene board. In addition, the liquid outlet sub-tube 13 on the most upstream coolant ring tube 21 is connected to the coolant return pipe 28 on the cooling box 16, and the liquid inlet sub-tube 12 on the most downstream coolant ring tube 21 is connected to the coolant 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 coolant ring tube 21 is connected to a plurality of heat-conducting shafts 22, and 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. The adjacent two fixed rings 3 are connected by a connecting rod 24. In this way, the plurality of fixed rings 3 are fixedly connected to each other. Through the arrangement of the heat-conducting shaft 22 and the heat-conducting ball 23, the heat energy It can be quickly conducted between the cooling liquid ring pipe 21 and the forming and conveying roller sleeve 15. After the cooling liquid comes out of the cooling box 16, it flows from the downstream cooling liquid ring pipe 21 to the upstream cooling liquid ring pipe 21. In the process of flowing, the cooling liquid will exchange heat with the extruded polystyrene board, resulting in the lowest temperature of the downstream forming and conveying roller sleeve 15, and the temperature of the upstream forming and conveying roller sleeve 15 is relatively high. In this way, 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 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.

[0025] In an embodiment of the present invention, a row of liquid inlet sub-pipes 12 are connected through an inlet branch pipe 10, and a row of liquid discharge sub-pipes 13 are connected through 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 coolant ring pipe 21 is connected to the inlet branch pipe 10 on the adjacent upstream coolant ring pipe 21 through a connecting pipe 14, the outlet branch pipe 11 on the most upstream coolant ring pipe 21 is connected to the coolant return pipe 28 on the cooling box 16 through the liquid outlet main pipe 9, and the inlet branch pipe 10 on the most downstream coolant ring pipe 21 is connected to the coolant outlet pipe 27 on the cooling box 16 through the liquid inlet main pipe 8, so that the flow direction of the coolant from downstream to upstream is guaranteed. When the cooling liquid loop 21 is part of the upper conveying roller group, the liquid inlet sub-tube 12 is connected to the bottom of the cooling liquid loop 21 near the upstream direction, and the liquid outlet sub-tube 13 is connected to the bottom of the cooling liquid loop 21 near the downstream direction. The bottom of the cooling liquid loop 21 is the part that performs heat exchange with the extruded polystyrene board. Since the liquid inlet sub-tube 12 is connected to the bottom of the cooling liquid loop 21 near the upstream, the cooling liquid will perform heat exchange as soon as it enters the cooling liquid loop 21. Since the liquid outlet sub-tube 13 is connected to the bottom of the cooling liquid loop 21 near the downstream, the cooling liquid will flow away immediately after the heat exchange, making the heat exchange more efficient. Similarly, when the cooling liquid loop 21 is part of the lower conveying roller group, the liquid inlet sub-tube 12 is connected to the top of the cooling liquid loop 21 near the upstream direction, and the liquid outlet sub-tube 13 is connected to the top of the cooling liquid loop 21 near the downstream direction.

[0026] In the embodiment of the present invention, the high-efficiency production device of the extruded polystyrene board further includes a first delivery pump 17 and a second delivery pump 18 which are fixedly installed, 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. The arrangement of the first delivery pump 17 and the second delivery pump 18 ensures the smooth flow of the coolant.

[0027] In the embodiment of the present invention, the coolant return pipe 28 is arranged at the bottom of the cooling box 16, 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, a refrigeration system is installed in the cavity, for example, a refrigeration system of a refrigerator, the refrigeration system includes an evaporator, part of the refrigerant pipe 20 in the evaporator runs 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. In this way, the coolant with a higher temperature flowing back to the cooling box 16 can be quickly cooled, and the efficiency is higher.

[0028] 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 mounted on the frame 1, the two ends of the forming conveying roller sleeve 15 are fixed rings 3, the outer ends of the fixed rings 3 are connected to the disc side plates 5, the disc side plates 5 are coaxially fixedly connected to the rotating shaft 2, the output shaft of the driving motor 7 is coaxially fixedly connected to the rotating shaft 2, the rotating shafts 2 are connected by a transmission belt 6, and further, the rotating shafts 2 can also be connected by a sprocket and a chain.

[0029] In the 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 inlet manifold 8, the outlet manifold 9 and the connecting pipe 14 are all connected to the frame 1 through the support rod 19, so that the stability of the pipeline is better. The end surface of the fixed ring 3 is provided with a convex strip 25, and the end surface of the rotating ring is provided with a groove, and the convex strip 25 is slidably connected with the groove.

[0030] The working process of the embodiment of the present invention is as follows: when in use, the drive motor 7 is started, and 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, and the upper conveying roller group and the lower conveying roller group will transport the extruded polystyrene board. During the transportation process, from upstream to downstream, the forming conveying roller sleeve 15 will gradually cool down and shape the extruded polystyrene board to ensure that the shape and size of the extruded board can be stably maintained to avoid deformation and distortion.

[0031] 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 scope of the subject matter of the invention. These embodiments and their variations are included in the scope and subject matter of the invention, and are included in the invention described in the claims and the scope of their equivalents.

[0032] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes 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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