Heavy high-torque stepless speed change paper collector

Abstract

The utility model relates to the technical field of paper winders, in particular to a heavy high-torque stepless speed change paper winder which comprises a driving winder and a driven winder which are oppositely arranged, the driving winder and the driven winder are each provided with a shell, a winding drum connector and a rotating shaft, and the rotating shafts are rotationally connected to the shells. The winding drum connector is fixed to one end of the rotating shaft, the winding drum connector of the driving winder and the winding drum connector of the driven winder are coaxially and oppositely arranged, an electric motor for driving the rotating shaft to rotate is further installed in a shell of the driving winder, and a face metal plate used for improving the bearing capacity is arranged on one side of the shell. A reinforcing metal plate is further fixedly installed on the side, located in the shell, of the face metal plate, and due to the structural design, when large pressure and weight are generated when heavy printing supplies are wound, the shell of the paper collector can keep good rigidity and is not prone to deformation or damage, and therefore stability and reliability in the winding process are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a paper collector technical field especially a heavy high torque stepless speed change paper collector. BACKGROUND

[0002] In the field of digital image output today, the photo printer has been widely used in many industries such as advertising production, interior decoration, image output, etc. due to its ability to print various images and text materials with high precision and high quality. However, the storage of printing consumables is an important part of the entire workflow of the photo printer that cannot be ignored.

[0003] Currently, the industry generally uses a winding method for the storage of photo printer printing consumables, which mainly relies on a paper collector to achieve this. As a key device, the paper collector is usually composed of a driving collector and a driven collector. In actual operation, the winding drum used for winding the consumables is precisely connected between the driving collector and the driven collector. The driving collector is equipped with a dedicated power system that can effectively transmit power to the connecting head of the connecting drum, causing the connecting head to rotate and thus driving the entire drum to rotate continuously and stably, thereby achieving automatic winding of the printed materials.

[0004] In this winding process, the role of the paper collector is far beyond simply collecting materials. The winding force generated by the power system directly affects the state of the printing medium and the final printing and winding quality. When the winding force is within an appropriate range, the printing medium can maintain an ideal state of flatness and tightness during the winding process. This state is of great significance for protecting the nozzle, as it can effectively avoid wrinkles or friction and scratches between the material and the nozzle due to relaxation, thereby significantly reducing the potential risk of nozzle blockage and damage, providing a solid guarantee for stable and high-quality printing operations. Therefore, the coordination between the paper collector and the photo printer is one of the core elements to ensure the smooth progress of the entire printing and storage process and to meet product quality standards.

[0005] However, with the continuous progress of technology and the continuous evolution of market demand, people have higher and more stringent requirements for winding photo printer printing consumables. One of the notable trends is the requirement for the paper collector to wind longer printing consumables. This demand arises mainly from the increasing number of large-scale commercial printing projects and the pursuit of continuous printing operation efficiency improvement. However, winding longer consumables is not an easy task for existing paper collectors, as longer consumables necessarily mean greater weight, which poses a serious challenge to the load-bearing capacity of the paper collector.

[0006] The existing paper accumulator is designed and manufactured based on the commonly used material length and weight standard at that time. When facing the new demand of rolling longer and heavier material, the limitations of its structure and performance are gradually exposed. For example, the problems such as deformation of the winding drum, overload operation and even damage of the power system, and jam or instability during the winding process may occur due to insufficient bearing capacity. These problems not only seriously affect the normal operation of the paper accumulator, causing it to be unable to continuously and stably complete the winding task, but also greatly reduce the winding efficiency of the material, which greatly reduces the production efficiency of the whole photo printer and cannot meet the demand of modern high-efficiency production.

[0007] In summary, in view of the increasing demand for long material winding in the current photo printer printing industry and the obvious shortcomings of the existing paper accumulator in bearing capacity, there is an urgent need to develop a new type of paper accumulator with greater bearing capacity. This new type of paper accumulator should be able to maintain a stable and efficient operating state when facing longer and heavier printing materials, ensuring that the printing quality is not affected while significantly improving the winding efficiency of the material, thereby providing strong technical support and equipment guarantee for the further development and upgrading of the photo printer industry, filling the gap in this key technical field in the existing market, and promoting the entire industry to a higher level. Practical new type content

[0008] The utility model aims at providing a technical scheme which can solve the above problems.

[0009] A heavy-duty high-torque stepless speed change paper accumulator, comprising a driving accumulator and a driven accumulator arranged opposite to each other, the driving accumulator and the driven accumulator are both provided with a shell, a winding drum connector and a rotating shaft, the rotating shaft is rotatably connected to the shell, the winding drum connector is fixed to one end of the rotating shaft, and the winding drum connectors of the driving accumulator and the driven accumulator are coaxial and arranged opposite to each other, an electric motor for driving the rotating shaft to rotate is also installed inside the shell of the driving accumulator, one side of the shell is provided with a face panel for improving the bearing capacity, a reinforcing panel is also fixedly installed on the side of the face panel inside the shell, and the face panel and the reinforcing panel are spaced apart, bearings are installed on the face panel and the reinforcing panel, and the rotating shaft is rotatably connected to the face panel and the reinforcing panel through the bearings.

[0010] Preferably, the lower end of the face panel is vertically bent with a bottom panel, the shell further comprises a back panel fixedly connected to the rear end of the bottom panel and a U-shaped shell fixedly installed between the face panel and the back panel, and the edges of the face panel and the back panel are bent and formed with a fixed edge, and the U-shaped shell is fixedly connected with the fixed edge.

[0011] Preferably, a plurality of splicing interfaces are formed on the fixed edge of the face panel, and the reinforcing panel is provided with a splicing edge which is connected to the splicing interfaces, and the face panel and the reinforcing panel are spliced together through the splicing interfaces and the splicing edge, and the splicing interfaces and the splicing edge are welded and fixed after splicing.

[0012] Preferably, a plurality of fixing columns are connected to one side of the electric motor corresponding to the output end, and the electric motor is fixedly connected to the reinforcing panel through the fixing columns.

[0013] Preferably, the electric motor is a high-torque stepless speed motor, and a control panel is arranged on one side of the shell of the active roller, and a main control circuit is arranged in the shell of the active roller, and the electric motor and the control panel are electrically connected to the main control circuit.

[0014] Preferably, the drum connecting head has a drum end abutting flange, a drum inner wall abutting boss formed on the drum end abutting flange, a reinforcing boss axially formed on the drum inner wall abutting boss, and a plurality of drum abutting pieces mounted on the outer walls of the drum inner wall abutting boss and the reinforcing boss, and a plurality of fixing grooves are formed on the outer walls of the drum inner wall abutting boss and the reinforcing boss, and the drum abutting pieces are connected to the fixing grooves.

[0015] Preferably, a protrusion is arranged in the fixing groove, and a recess corresponding to the protrusion is arranged on the drum abutting piece, and the drum abutting piece is oriented to be connected to the fixing groove along the side of the drum inner wall abutting boss and the reinforcing boss through the limitation of the protrusion and the recess, and a clamping part is arranged in the fixing groove, and a clamping interface corresponding to the clamping part is arranged on the drum abutting piece, and the drum abutting piece is fixedly connected to the fixing groove through the clamping cooperation of the clamping interface and the clamping part.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] 1) The face panel and the reinforcing panel are designed: the face panel is arranged on one side of the shell, effectively increasing the overall structural strength and stability of the shell, and being able to withstand greater external force. The reinforcing panel is fixed on the side of the face panel inside the shell and spaced apart from the face panel, forming a composite reinforcing structure. This structure design makes the shell of the paper collector maintain good rigidity when facing the large pressure and weight generated by heavy printing consumable winding, and is not easily deformed or damaged, thereby ensuring the stability and reliability of the winding process.

[0018] 2) Bearing installation optimization: the rotating shaft is installed on the face sheet metal and the reinforcing sheet metal through bearings, which not only makes the rotating of the rotating shaft more smooth and reduces the friction resistance, but also enables the rotating shaft to be better supported when bearing high torque and large weight load. The bearings evenly distribute the force borne by the rotating shaft, avoid damage caused by excessive local force, and further improve the overall carrying capacity of the paper accumulator.

[0019] Additional aspects and advantages of the present application will be described in the following description, some of which will become apparent to those skilled in the art from the following description, some of which will be learned from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0021] Figure 1 is a structural schematic diagram of the present application;

[0022] Figure 2 is a structural schematic diagram of the present application in use state;

[0023] Figure 3 is a split structural schematic diagram of the active accumulator in the present application;

[0024] Figure 4 is a structural schematic diagram of the face sheet metal, the reinforcing sheet metal and the rotating shaft in the present application;

[0025] Figure 5 is a structural schematic diagram of the winding drum connector in the present application;

[0026] Figure 6 is a sectional structural schematic diagram of the winding drum connector in the present application.

[0027] The reference signs and names in the drawings are as follows:

[0028] Active accumulator 10, electric motor 11, fixed column 12, control panel 13, main control circuit 14, driven accumulator 20, shell 30, face sheet metal 31, reinforcing sheet metal 32, bearing 33, bottom sheet metal 34, back sheet metal 35, U-shaped shell 36, fixed edge 37, splicing interface 38, splicing edge 39, winding drum connector 40, winding drum end abutting flange 41, winding drum inner wall abutting boss 42, reinforcing boss 43, winding drum abutting piece 44, fixed groove 45, protruding part 46, recessed part 47, clamping part 48, clamping interface 49, rotating shaft 50. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0030] Please refer to Figures 1-6 In the embodiments of the present application, a heavy high-torque stepless speed change paper collector comprises a driving collector 10 and a driven collector 20 arranged oppositely, the driving collector 10 and the driven collector 20 are both provided with a shell 30, a winding drum connecting head 40 and a rotating shaft 50, the rotating shaft 50 is rotatably connected to the shell 30, the winding drum connecting head 40 is fixed to one end of the rotating shaft 50, and the winding drum connecting heads 40 of the driving collector 10 and the driven collector 20 are coaxial and arranged oppositely, an electric motor 11 for driving the rotating shaft 50 to rotate is further installed inside the shell 30 of the driving collector 10, one side of the shell 30 is provided with a face panel 31 for improving the bearing capacity, a reinforcing panel 32 is further fixedly installed on the side of the face panel 31 inside the shell 30, and the face panel 31 and the reinforcing panel 32 are spaced apart, bearings 33 are installed on the face panel 31 and the reinforcing panel 32, and the rotating shaft 50 is rotatably connected to the face panel 31 and the reinforcing panel 32 through the bearings 33.

[0031] In use, the driving winding machine 10 and the driven winding machine 20 are fixed at the front end of the photo printer, and the winding head 40 of the two are coaxially arranged to fix the winding roll between the two winding heads 40. In the driving winding machine 10 of the heavy high-torque stepless speed change paper winding device, the electric motor 11 serves as a power source. When started, the electric motor 11 outputs power to drive the rotating shaft 50 to rotate. The rotating shaft 50 is installed on the face plate 31 and the reinforcing plate 32 through the bearing 33, which ensures that the rotating shaft 50 can stably rotate around the shaft center. The winding head 40 is fixed at one end of the rotating shaft 50, and the winding heads 40 of the driving winding machine 10 and the driven winding machine 20 are coaxially arranged. When the rotating shaft 50 of the driving winding machine 10 rotates, it drives the winding roll connected thereto to rotate. Due to the cooperation of the driven winding machine 20 and the driving winding machine 10, the printing consumables can be stably wound on the winding roll between the two winding heads 40. The electric motor 11 cooperates with the specially designed stepless speed change system and has high torque output characteristics, that is, the electric motor 11 is a high-torque stepless speed change motor. According to the actual winding requirements, such as winding requirements of printing consumables with different materials, different thicknesses and different lengths, the rotating speed of the electric motor 11 can be continuously and accurately adjusted. When winding light, thin and short consumables, the rotating speed can be reduced to avoid excessive pulling. When processing thick, heavy and long consumables, the rotating speed is increased to ensure the winding efficiency. Through this stepless speed change mode, the winding process is always in an optimized state, which can adapt to various complex printing operations.

[0032] In the above technical solution, the face plate 31 is carefully arranged on one side of the shell 30, and the reinforcing plate 32 is firmly installed on the inside of the face plate 31. The distance between the two is separated to form a stable composite structure system, which greatly enhances the overall structural strength and stability, and can cope with the great pressure and weight of heavy printing consumables winding. The rotating shaft 50 is stably supported and smoothly rotated by the bearing 33 installed on the face plate 31 and the reinforcing plate 32, effectively disperses the stress, and further enhances the bearing capacity.

[0033] The structure of the face plate 31 and the reinforcing plate 32 is arranged to make the strength of the paper receiver perfect and efficient, and to adapt to the functions of stepless speed regulation and high torque winding. In terms of stepless speed regulation, the winding speed can be flexibly and accurately adjusted according to the characteristics of different printing materials, such as material, length, etc. For fine and tension-sensitive printing materials, the speed can be reduced to avoid damage. For long and ordinary material, the speed can be increased to improve efficiency. In the process of speed regulation, the high bearing structure effectively protects the parts, reduces wear and tear, prolongs the service life of the equipment, and reduces maintenance costs. In terms of high torque winding function, for thick and long printing materials, the powerful torque output can smoothly overcome inertia and friction, ensure smooth winding, eliminate abnormality such as jamming, and maintain uniform tension to prevent the material from wrinkling, relaxing or shifting, etc. The wound material is neat and compact, which is convenient for subsequent handling, storage and processing, and fully guarantees the efficient and high-quality development of the printer, and long-term stable operation is effectively ensured.

[0034] Please refer to Figures 3-4 The lower end of the face plate 31 is vertically bent to form a bottom plate 34. The housing 30 further includes a back plate 35 fixedly connected to the rear end of the bottom plate 34 and a U-shaped shell 36 fixedly installed between the face plate 31 and the back plate 35. The edges of the face plate 31 and the back plate 35 are bent to form a fixed edge 37, and the U-shaped shell 36 is fixedly connected with the fixed edge 37. This preferred scheme can optimize the structural stability of the paper receiver. The bottom plate 34 increases the contact area and connection strength with the supporting surface, effectively disperses the pressure, and reduces the risk of deformation caused by excessive local stress. The U-shaped shell 36 strengthens the connection rigidity between the face plate 31 and the back plate 35 like a frame, and cooperates with the fixed edge 37 to form a more stable overall structure, thereby significantly improving the tolerance of the paper receiver to complex stress when carrying heavy printing materials. During the high torque stepless speed regulation operation, the mechanical structure of the entire device is stable and reliable, reducing vibration and displacement, providing a solid guarantee for continuous and stable winding operation, greatly improving the durability and working precision of the paper receiver, prolonging its service life, and reducing maintenance costs and failure probability caused by structural looseness or deformation.

[0035] Please refer to Figures 3-4The fixed edge 37 of the face panel 31 is provided with a plurality of splicing interfaces 38, and the edge of the reinforcing panel 32 is provided with a splicing edge 39 which is connected to the splicing interface 38. The face panel 31 and the reinforcing panel 32 are spliced and matched through the splicing interface 38 and the splicing edge 39, and the splicing interface 38 and the splicing edge 39 are welded and fixed after splicing. This design greatly enhances the connection strength and integrity between the face panel 31 and the reinforcing panel 32, and makes them form a tight structural unit that works cooperatively. When facing high pressure and high torque load of heavy printing consumables, stress can be more evenly dispersed, effectively preventing structural deformation or loosening due to weak connection, thereby providing more reliable protection for the high load capacity of the paper receiver, ensuring that the stepless speed change and high torque winding function can work stably during long-term operation, reducing equipment failure and maintenance needs due to structural problems, improving the overall reliability and durability of the equipment, and further optimizing the working performance and service life of the paper receiver.

[0036] Please refer to Figure 3 The electric motor 11 is connected to one side of the output end through a plurality of fixed columns 12, and the electric motor 11 is fixedly connected to the reinforcing panel 32 through the fixed columns 12. The stable connection achieved by the fixed columns 12 can firmly fix the electric motor 11 on the reinforcing panel 32, effectively preventing displacement or loosening of the electric motor 11 due to its own vibration or reaction force generated during high torque output, and ensuring accurate cooperation between the electric motor 11 and the entire paper receiver transmission structure. The control panel 13 is arranged on one side of the U-shaped shell 36 of the active winder 10, and the main control circuit 14 is arranged inside the shell 30 of the active winder 10. The electric motor 11 and the control panel 13 are electrically connected to the main control circuit 14, respectively. The control panel 13 provides a convenient and intuitive operation interface for the user, and can easily realize accurate control of various functions of the paper receiver, such as flexibly setting the speed, torque and other parameters of the electric motor 11 according to different printing consumable characteristics and job requirements, to achieve the best stepless speed change effect and high torque winding adaptability. The main control circuit 14 is like the intelligent center of the paper receiver, efficiently processes the instructions of the control panel 13 and accurately controls the operation of the electric motor 11, ensures stable power output, and simultaneously monitors and feedback adjusts the entire winding process, ensuring the accuracy and consistency of the winding operation.

[0037] Please refer to Figures 5-6The embodiment further proposes that the winding drum connector 40 has a winding drum end abutting flange 41, a winding drum inner wall abutting boss 42 formed on the winding drum end abutting flange 41, a reinforcing boss 43 axially formed on the winding drum inner wall abutting boss 42, and a plurality of winding drum abutting members 44 installed on the outer wall of the winding drum inner wall abutting boss 42 and the reinforcing boss 43. A plurality of uniformly distributed fixing grooves 45 are formed on the outer wall of the winding drum inner wall abutting boss 42 and the reinforcing boss 43, and the winding drum abutting members 44 are connected to the fixing grooves 45. The winding drum end abutting flange 41 can effectively abut against the end of the winding drum, providing stable axial support force to prevent axial displacement of the winding drum during high-torque winding. The winding drum inner wall abutting boss 42 closely fits the winding drum inner wall, ensuring the accuracy and efficiency of power transmission, so that the high torque output by the electric motor 11 can accurately drive the winding drum to rotate. The reinforcing boss 43 further strengthens the structural strength of the connector, enabling it to withstand greater radial and axial loads.

[0038] Please refer to Figures 5-6The embodiment further proposes that the fixing groove 45 is provided with a protruding part 46, the winding drum abutting part 44 is provided with a recessed part 47 corresponding to the protruding part 46, the winding drum abutting part 44 is oriented to abut the side of the butt joint boss 42 and the reinforcing boss 43 along the inner wall of the winding drum in the fixing groove 45 through the limitation of the protruding part 46 and the recessed part 47, and the fixing groove 45 is further provided with a clamping part 48, the winding drum abutting part 44 is provided with a clamping port 49 corresponding to the clamping part 48, and the winding drum abutting part 44 is fixedly connected to the fixing groove 45 through the clamping cooperation of the clamping port 49 and the clamping part 48. The connection reliability between the connecting head and the winding drum is significantly enhanced through the unique fixing groove 45 connection mode of the plurality of winding drum abutting parts 44, the winding drum abutting part 44 is mainly used for reinforcing the winding drum, and different sizes can be replaced to adapt to winding drums of different specifications. The protruding part 46 in the fixing groove 45 and the recessed part 47 of the winding drum abutting part 44 cooperate with each other, realize the accurate orientation of the winding drum abutting part 44 on the side of the butt joint boss 42 and the reinforcing boss 43, effectively avoid the misplacement deviation in the installation process, and ensure the consistency and stability of the connection. The clamping cooperation of the clamping part 48 and the clamping port 49 firmly fixes the winding drum abutting part 44 in the fixing groove 45, so that the winding drum abutting part 44 is prevented from loosening even under strong vibration and impact generated by high torque and heavy material winding, and the tight connection between the winding drum and the connecting head is always maintained. The optimized winding drum connecting head 40 design plays a key role in the high-load, high-torque stepless speed change operation system of the entire paper accumulator. It not only effectively guarantees the stability and reliability of the winding process, reduces the winding quality problems caused by loose connection, such as material wrinkles and deviation, but also facilitates the disassembly and replacement of the winding drum abutting part 44, greatly improves the compatibility of the paper accumulator to winding drums of different specifications and materials, enhances the universality and adaptability of the equipment, reduces the equipment maintenance cost and operation complexity, and lays a solid foundation for the long-term stable and efficient operation of the photo printer paper accumulator.

[0039] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A heavy high-torque stepless speed change paper reel, comprising a driving reel (10) and a driven reel (20) arranged oppositely, the driving reel (10) and the driven reel (20) are each provided with a housing (30), a reel connecting head (40) and a rotating shaft (50), the rotating shaft (50) is rotatably connected to the housing (30), the reel connecting head (40) is fixed to one end of the rotating shaft (50), and the reel connecting heads (40) of the driving reel (10) and the driven reel (20) are coaxial and arranged oppositely, and an electric motor (11) for driving the rotating shaft (50) to rotate is further installed inside the housing (30) of the driving reel (10), characterized in that, The side of the shell (30) is provided with a face panel (31) for improving the bearing capacity, a reinforcing panel (32) is fixedly installed on the side of the face panel (31) inside the shell (30), the face panel (31) and the reinforcing panel (32) are spaced apart, bearings (33) are installed on the face panel (31) and the reinforcing panel (32), and a rotating shaft (50) is rotatably connected to the face panel (31) and the reinforcing panel (32) through the bearings (33).

2. A heavy duty high torque stepless speed change paper reel-up according to claim 1, characterized in that, The lower end of the face panel (31) is vertically bent to form a bottom panel (34), the shell (30) further comprises a back panel (35) fixedly connected to the rear end of the bottom panel (34) and a U-shaped shell (36) fixedly installed between the face panel (31) and the back panel (35), and the edges of the face panel (31) and the back panel (35) are bent to form fixing edges (37), and the U-shaped shell (36) is fixedly connected with the fixing edges (37).

3. A heavy duty high torque stepless speed change paper reel-up as claimed in claim 2, wherein, A plurality of splicing openings (38) are formed in the fixing edges (37) of the face panel (31), the edges of the reinforcing panel (32) are extended to form splicing edges (39) which are connected to the splicing openings (38), the face panel (31) and the reinforcing panel (32) are spliced and matched through the splicing openings (38) and the splicing edges (39), and the splicing openings (38) and the splicing edges (39) are welded and fixed after splicing.

4. A heavy duty high torque stepless speed change paper reel-up as claimed in claim 1 wherein, A plurality of fixing columns (12) are connected to the side of the electric motor (11) corresponding to the output end, and the electric motor (11) is fixedly connected with the reinforcing panel (32) through the fixing columns (12).

5. A heavy duty high torque stepless speed change paper reel-up as claimed in claim 1 wherein, The electric motor (11) is a high-torque stepless speed motor, a control panel (13) is arranged on the side of the U-shaped shell (36) of the active roller (10), a main control circuit (14) is arranged inside the shell (30) of the active roller (10), and the electric motor (11) and the control panel (13) are electrically connected with the main control circuit (14).

6. A heavy duty high torque stepless variable speed paper reel-up as claimed in claim 1 wherein, The drum connecting head (40) comprises a drum end abutting flange (41), a drum inner wall abutting boss (42) formed on the drum end abutting flange (41), a reinforcing boss (43) axially formed on the drum inner wall abutting boss (42), and a plurality of drum abutting members (44) installed on the outer walls of the drum inner wall abutting boss (42) and the reinforcing boss (43), a plurality of uniformly distributed fixing grooves (45) are formed on the outer walls of the drum inner wall abutting boss (42) and the reinforcing boss (43), and the drum abutting members (44) are connected to the fixing grooves (45).

7. A heavy duty high torque stepless transfer reel according to claim 6, wherein, The fixed groove (45) is provided with a protruding part (46), the winding drum abutting part (44) is provided with a recessed part (47) corresponding to the protruding part (46), the winding drum abutting part (44) is limited by the protruding part (46) and the recessed part (47) to be oriented to abut the side of the butt joint boss (42) and the reinforcing boss (43) along the inner wall of the winding drum in the fixed groove (45), the fixed groove (45) is further provided with a clamping part (48), the winding drum abutting part (44) is provided with a clamping port (49) corresponding to the clamping part (48), and the winding drum abutting part (44) is fixedly connected to the fixed groove (45) through the clamping of the clamping port (49) and the clamping part (48).

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