Power supply roller assembly for copper strip electroplating production line

Abstract

The power supply roller assembly for the copper strip electroplating production line comprises a mounting base, an operation side support, a first transmission side support and a second transmission side support are mounted at the top end of the mounting base, and top end supporting plates are mounted at the top ends of the operation side support, the first transmission side support and the second transmission side support; a transmission side bearing seat and an operation side bearing seat are installed at the top end of the first transmission side support and the top end of the operation side support respectively, and a main shaft is rotationally connected between the transmission side bearing seat and the operation side bearing seat. By arranging the abrasive belt grinding mechanism, during use, the abrasive belt grinding mechanism drives an abrasive belt to slide left and right, and meanwhile, the abrasive belt is in contact with the power supply roller, so that the surface of the power supply roller is ground, the surface of the power supply roller is kept smooth, the dismounting and grinding frequency of the power supply roller is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electroplating production lines, and in particular to a power supply roller assembly used in a copper strip electroplating production line. Background Art

[0002] With the rapid development of the electronics industry, especially the rapid development of new energy vehicles, various high-performance products have emerged one after another, and the performance requirements for basic materials have become increasingly higher. Copper alloy materials widely used in automotive connectors are required to maintain stable electrical conductivity in any working environment. To this end, the material needs to be resistant to high temperatures, corrosion, and excellent in weldability, stress release resistance to miniaturization, and lead-free to meet environmental protection requirements. However, copper metal itself is easily oxidized and discolored, and this oxide film will affect the electrical conductivity. Therefore, a tin-plated layer is attached to the surface of the material in contact with the outside to meet this requirement.

[0003] By attaching a tin-plated layer on the surface of the copper strip material that contacts the outside, in the electronics industry, tin is often used instead of silver plating, taking advantage of its high chemical stability, low melting point, good solderability, conductivity and resistance to discoloration. Through a special pre-treatment process, a firmly bonded, bright, dense, uniform and continuous tin plating is formed on the surface of the composite material, which is widely used in the surface protection of electronic components, connectors, leads and printed circuit boards. In addition to improving solderability, tin-plated copper strips can also isolate the effects of sulfur in insulating materials. Tin-plated copper strips have the characteristics of anti-oxidation and excellent welding performance, which improves the conductivity of connector contacts, ensures the working stability and reliability of electrical components, and meets the environmental protection requirements of lead-free.

[0004] In the electroplating production line in the prior art, a feed roller is required. The feed roller is one of the important core components of the wide-width electroplating line. During the production process, sudden electric arcs occasionally damage the surface of the feed roller, which needs to be kept smooth, otherwise it will affect the electroplating quality. The traditional feed roller surface lacks a grinding mechanism, which makes the surface of the feed roller easily uneven and causes spark damage, thereby affecting the electroplating quality.

[0005] Therefore, how to provide a power supply roller assembly for a copper strip electroplating production line to solve the problems existing in the prior art is of great significance to its application. Summary of the invention

[0006] In view of this, the purpose of the present application is to provide a power supply roller assembly for a copper strip electroplating production line to solve the problem that the traditional power supply roller surface lacks a grinding mechanism, which makes the power supply roller surface easily uneven and causes spark damage, thereby affecting the electroplating quality.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A power supply roller assembly for a copper strip electroplating production line comprises a mounting base, an operating side bracket, a transmission side bracket 1 and a transmission side bracket 2 are mounted on the top of the mounting base, a top support plate is mounted on the top of the operating side bracket, the transmission side bracket 1 and the transmission side bracket 2, a transmission side bearing seat and an operating side bearing seat are mounted on the top of the transmission side bracket 1 and the operating side bracket respectively, a main shaft is rotatably connected between the transmission side bearing seat and the operating side bearing seat, a power supply roller and a power supply ring are fixedly connected to the main shaft, a lifting slide rail is mounted on the inner side of the operating side bracket and the transmission side bracket 1, two of the lifting slide rails are slidably connected with a pressure roller lifting bearing seat, a pressure roller is rotatably connected between the two pressure roller lifting bearing seats, a cylinder 2 is mounted on the bottom end of the transmission side bracket 1 and the operating side bracket, and the telescopic end of the cylinder 2 is fixedly connected to the pressure roller lifting bearing seat;

[0009] A driving motor is installed at the top of the top support plate, and a driving sprocket is connected to the output end of the driving motor in a transmission manner. A transmission sprocket is installed at the end of the main shaft, and the transmission sprocket and the driving sprocket are connected through a chain transmission. A protective cover is installed on the outer side of the second transmission side bracket, and the driving sprocket, the transmission sprocket and the transmission sprocket are all located inside the protective cover;

[0010] A water tank is installed between the operating side bracket and the transmission side bracket, and the pressure roller is located inside the water tank.

[0011] Preferably, a cylinder 1 is installed on the side of the transmission side bracket 1 and the operating side bracket, a fixing pin is installed on the telescopic end of the cylinder 1, and a pin hole matching the fixing pin is provided on the side of the pressure roller lifting bearing seat.

[0012] Preferably, a sponge cleaning mechanism is installed on the front and rear sides of the top support plate, and the sponge cleaning mechanism includes a cylinder four, a bracket and a sponge strip, the cylinder four is fixedly connected to the bracket, and the sponge strip is installed on the telescopic end of the cylinder four.

[0013] Preferably, a sanding belt grinding mechanism is installed at the top of the top support plate, and the sanding belt grinding mechanism includes a motor fixing plate, a sliding seat, a screw motor, a second fixing frame, a first fixing frame, a sanding belt, a third cylinder, a sliding seat, and a screw;

[0014] The screw motor is installed on the top of the top support plate through the motor fixing plate, the fixing frame 1 and the fixing frame 2 are both installed on the top of the top support plate, a sliding rod is fixedly connected between the fixing frame 1 and the fixing frame 2, the sliding seat is slidably connected to the sliding rod, the screw is threadedly connected to the sliding seat, the output shaft of the screw motor is transmission-connected to the screw, the cylinder 3 is installed on the bottom end of the sliding seat, and the sanding belt is installed on the telescopic end of the cylinder 3.

[0015] Preferably, a hollow groove is provided at the top of the top support plate, and the abrasive belt passes through the hollow groove and is located directly above the power supply roller.

[0016] Preferably, the two sponge cleaning mechanisms are both installed obliquely, and the length of the sponge strip is equal to that of the power supply roller.

[0017] Preferably, water retaining plates are provided at both ends of the pressure roller, and water retaining rings are provided at both ends of the power supply roller.

[0018] Preferably, vertical elliptical holes are opened on both sides of the water tank, and the two ends of the pressure roller are interference connected with the two vertical elliptical holes.

[0019] Preferably, the bottom end of the mounting base is provided with multiple layers, and the middle layer at the bottom end of the mounting base is an insulating layer.

[0020] Preferably, rotary joints are installed at both ends of the main shaft, the interior of the main shaft is a hollow cavity, the two rotary joints are connected to the hollow cavity, a cooling cavity is opened inside the power feeding roller, a cooling hole is opened in the middle of the hollow cavity, and the cooling hole is connected to the cooling cavity.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention is provided with a sanding belt grinding mechanism. When in use, the sanding belt grinding mechanism drives the sanding belt to slide left and right, and at the same time, the sanding belt contacts the power feeding roller, thereby grinding the surface of the power feeding roller, keeping the surface of the power feeding roller smooth and flat, making the electroplating production line more stable;

[0023] 2. The present invention uses a sponge cleaning mechanism to clean the plating liquid on the surface of the electric roller, thereby preventing excessive plating liquid from adhering to the surface of the electric roller;

[0024] 3. The present invention adopts the upper design of the power supply roller, which is convenient for disassembly and maintenance of the power supply roller;

[0025] 4. The present invention adopts a lifting roller, so that the strip can be in close contact with the power supply roller to avoid electric sparks. At the same time, a fixing pin is provided after the roller rises to lock the height of the roller, which is safer;

[0026] 5. In the present invention, the power feed roller is provided with a cooling cavity, and cooling water enters the cooling cavity through a rotary joint to cool the power feed roller and reduce the temperature of the power feed roller.

[0027] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application so that it can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings as follows.

[0028] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 is a side view of the present invention;

[0032] Figure 3 is an internal cross-sectional view of the present invention;

[0033] Figure 4 A top view of the present invention;

[0034] Figure 5 It is a structural schematic diagram of the abrasive belt grinding mechanism in the present invention;

[0035] Figure 6 It is a structural schematic diagram of the sponge cleaning mechanism in the present invention.

[0036] In the figure: 1. Mounting base; 2. Transmission side bracket 1; 3. Water tank; 4. Transmission side bearing seat; 5. Transmission side bracket 2; 6. Power supply ring; 7. Protective cover; 8. Top support plate; 9. Driving motor; 10. Belt grinding mechanism; 11. Sponge cleaning mechanism; 12. Power supply roller; 13. Operating side bearing seat; 14. Spindle; 15. Pressure roller; 16. Cylinder 1; 17. Operating side bracket; 18. Cylinder 2; 19. Pressure roller lifting bearing seat; 20, lifting slide rail; 21, abrasive belt; 22, fixed frame one; 23, cylinder three; 24, fixing pin; 25, sliding seat; 26, fixed frame two; 27, screw motor; 28, motor fixing plate; 29, transmission sprocket; 30, driving sprocket; 31, chain; 32, water retaining plate; 33, water retaining ring; 34, cylinder four; 35, bracket; 36, sponge strip; 37, slide rod; 38, screw. DETAILED DESCRIPTION

[0037] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all of the embodiments. In the following description, specific details such as specific configuration and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures is omitted in the embodiment.

[0038] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0039] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0040] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions.

[0041] See also Figure 1-6The present invention provides a technical solution for a power supply roller assembly for a copper strip electroplating production line: comprising a mounting base 1, an operating side bracket 17, a transmission side bracket 12 and a transmission side bracket 25 are mounted on the top of the mounting base 1, a top support plate 8 is mounted on the top of the operating side bracket 17, the transmission side bracket 12 and the transmission side bracket 25, a transmission side bearing seat 4 and an operating side bearing seat 13 are mounted on the top of the transmission side bracket 12 and the operating side bracket 17 respectively, a main shaft 14 is rotatably connected between the transmission side bearing seat 4 and the operating side bearing seat 13, the main shaft 14 is fixedly connected with a power supply roller 12 and a power supply ring 6, a lifting slide rail 20 is mounted on the inner side of the operating side bracket 17 and the transmission side bracket 12, the two lifting slide rails 20 are both slidably connected with a pressure roller lifting bearing seat 19, a pressure roller 15 is rotatably connected between the two pressure roller lifting bearing seats 19, a cylinder 2 18 is mounted on the bottom end of the transmission side bracket 12 and the operating side bracket 17, and the telescopic end of the cylinder 2 18 is fixedly connected with the pressure roller lifting bearing seat 19;

[0042] A driving motor 9 is installed at the top of the top support plate 8, and a driving sprocket 30 is connected to the output end of the driving motor 9. A driving sprocket 29 is installed at the end of the main shaft 14. The driving sprocket 29 and the driving sprocket 30 are connected to each other through a chain 31. A protective cover 7 is installed on the outer side of the transmission side bracket 25, and the driving sprocket 30, the driving sprocket 29 and the driving sprocket 29 are all located inside the protective cover 7;

[0043] A water tank 3 is installed between the operating side bracket 17 and the transmission side bracket 2, and the pressure roller 15 is located inside the water tank 3.

[0044] A cylinder 16 is installed on the sides of the transmission side bracket 2 and the operation side bracket 17, and a fixing pin 24 is installed at the telescopic end of the cylinder 16. A pin hole matched with the fixing pin 24 is provided on the side of the pressure roller lifting bearing seat 19. When the cylinder 16 is started, the cylinder 16 drives the fixing pin 24 to be inserted into the pin hole matched with the fixing pin 24 provided on the side of the pressure roller lifting bearing seat 19, thereby completing the height fixation of the pressure roller 15.

[0045] Sponge cleaning mechanisms 11 are installed on the front and rear sides of the top support plate 8. The sponge cleaning mechanism 11 includes a cylinder four 34, a bracket 35 and a sponge strip 36. The cylinder four 34 is fixedly connected to the bracket 35, and the sponge strip 36 is installed at the telescopic end of the cylinder four 34.

[0046] Both sponge cleaning mechanisms 11 are installed obliquely, and the length of the sponge strip 36 is equal to that of the power supply roller 12. When in use, the sponge strip 36 is driven by the cylinder 4 34 to contact the surface of the power supply roller 12, and then the plating liquid on the surface of the power supply roller 12 is wiped, reducing the contact between the sanding belt 21 and the plating liquid.

[0047] The top of the top support plate 8 is provided with a sanding belt grinding mechanism 10, which includes a motor fixing plate 28, a sliding seat 25, a screw motor 27, a fixing frame 26, a fixing frame 1 22, a sanding belt 21, a cylinder 3 23, a sliding seat 25, and a screw 38;

[0048] The screw motor 27 is installed on the top of the top support plate 8 through the motor fixing plate 28, the fixing frame 1 22 and the fixing frame 26 are both installed on the top of the top support plate 8, a sliding rod 37 is fixedly connected between the fixing frame 1 22 and the fixing frame 26, the sliding seat 25 is slidably connected to the sliding rod 37, the screw 38 is threadedly connected to the sliding seat 25, the output shaft of the screw motor 27 is transmission-connected to the screw 38, the cylinder 3 23 is installed at the bottom end of the sliding seat 25, and the sanding belt 21 is installed at the telescopic end of the cylinder 3 23.

[0049] A hollow groove is formed at the top of the top support plate 8 , and the abrasive belt 21 passes through the hollow groove and is located just above the power feeding roller 12 .

[0050] The screw motor 27 drives the screw 38 to rotate, and the screw 38 drives the sliding seat 25 to slide on the sliding rod 37. At the same time, the cylinder 23 drives the sanding belt 21 to contact the surface of the power supply roller 12. The sanding belt 21 can slide left and right, thereby grinding the surface of the power supply roller 12.

[0051] Water retaining plates 32 are provided at both ends of the pressure roller 15, and water retaining rings 33 are provided at both ends of the power supply roller 12. The water retaining plates 32 and the water retaining rings 33 are provided to prevent splashing of the electroplating solution.

[0052] Vertical elliptical holes are provided on both sides of the water tank 3, and the two ends of the pressure roller 15 are interference-connected with the two vertical elliptical holes. The pressure roller 15 can be raised and lowered to facilitate the threading of the copper strip. At the same time, the pressure roller 15 can keep the strip tightly connected with the power supply roller 12 to avoid the generation of electric sparks.

[0053] The bottom of the mounting base 1 is provided with multiple layers, and the middle layer at the bottom of the mounting base 1 is an insulating layer. The present invention is suitable for a horizontal continuous electroplating production line, and the insulating layer has good insulation properties.

[0054] The sanding belt 21 is hollow, and the bottom end of the sanding belt 21 is set to an arc shape. The hollow part of the sanding belt 21 has a certain deformation ability, and the bottom of the sanding belt 21 is set to an arc shape, so that the bottom end of the sanding belt 21 can better contact with the power supply roller 12 and better grind the surface of the power supply roller 12.

[0055] Rotary joints are installed at both ends of the main shaft 14. The interior of the main shaft 14 is a hollow cavity. The two rotary joints are connected to the hollow cavity. A cooling cavity is opened inside the power supply roller 12. A cooling hole is opened in the middle of the hollow cavity. The cooling hole is connected to the cooling cavity. When cooling water flows through the cooling cavity, the power supply roller 12 is cooled to reduce the temperature of the power supply roller 12.

[0056] When in use, the copper strip is passed between the pressure roller 15 and the power supply roller 12, and then the cylinder 2 18 drives the pressure roller 15 upward and supports the copper strip through the lifting bearing seat 19. When the pressure roller 15 moves upward to the specified position, the cylinder 16 is started, and the cylinder 16 drives the fixing pin 24 to insert into the pin hole matched with the fixing pin 24 arranged on the side of the pressure roller lifting bearing seat 19, so as to complete the height fixation of the pressure roller 15, and then the driving motor 9 is started, and the driving motor 9 drives the driving sprocket 30 to rotate, and the driving sprocket 30 drives the transmission sprocket 29 to rotate through the chain 31, and the transmission sprocket 29 drives the power supply ring 6 and the power supply ring 6 through the main shaft 14. The electric roller 12 rotates, and the power is supplied to the power supply rod 12 through the power supply ring 6 to realize the electrification of the copper belt. The sponge strip 36 is driven by the cylinder 34 to contact the surface of the power supply rod 12, and then the plating liquid on the surface of the power supply roller 12 is wiped to reduce the contact between the sanding belt 21 and the plating liquid. Then the screw motor 27 drives the screw 38 to rotate, and the screw 38 drives the sliding seat 25 to slide on the sliding rod 37. At the same time, the sanding belt 21 is driven by the cylinder 23 to contact the surface of the power supply roller 12. The sanding belt 21 can slide left and right, thereby grinding the surface of the power supply roller 12 to keep the surface of the power supply roller 12 smooth and avoid spark injuries.

[0057] The above description is only the preferred embodiment of the present invention, which does not limit the protection scope of the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Within the spirit and principle of the present invention, any change, modification, replacement, integration and parameter change of these embodiments by conventional substitution or capable of achieving the same function without departing from the principle and spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A feed roller assembly for a copper strip electroplating production line, characterized in that: The invention comprises a mounting base (1), wherein an operating side bracket (17), a transmission side bracket 1 (2) and a transmission side bracket 2 (5) are mounted on the top of the mounting base (1), a top support plate (8) is mounted on the top of the operating side bracket (17), the transmission side bracket 1 (2) and the transmission side bracket 2 (5), a transmission side bearing seat (4) and an operating side bearing seat (13) are mounted on the top of the transmission side bracket 1 (2) and the operating side bracket (17), respectively, a main shaft (14) is rotatably connected between the transmission side bearing seat (4) and the operating side bearing seat (13), and the The main shaft (14) is fixedly connected with a power supply roller (12) and a power supply ring (6); a lifting slide rail (20) is installed on the inner side of the operating side bracket (17) and the transmission side bracket (2); the two lifting slide rails (20) are slidably connected with a pressure roller lifting bearing seat (19); a pressure roller (15) is rotatably connected between the two pressure roller lifting bearing seats (19); the bottom ends of the transmission side bracket (2) and the operating side bracket (17) are both installed with a cylinder (18); the telescopic end of the cylinder (18) is fixedly connected with the pressure roller lifting bearing seat (19); A driving motor (9) is installed at the top end of the top support plate (8), and a driving sprocket (30) is connected to the output end of the driving motor (9) in a transmission manner. A driving sprocket (29) is installed at the end of the main shaft (14), and the driving sprocket (29) and the driving sprocket (30) are connected in a transmission manner via a chain (31). A protective cover (7) is installed on the outer side of the transmission side bracket (5), and the driving sprocket (30), the driving sprocket (29) and the driving sprocket (29) are all located inside the protective cover (7); A water tank (3) is installed between the operating side bracket (17) and the transmission side bracket (2), and the pressure roller (15) is located inside the water tank (3).

2. A feed roller assembly for a copper strip electroplating production line as claimed in claim 1, characterized in that: A cylinder (16) is installed on the side of the transmission side bracket (2) and the operating side bracket (17), a fixing pin (24) is installed on the telescopic end of the cylinder (16), and a pin hole matching the fixing pin (24) is provided on the side of the pressure roller lifting bearing seat (19).

3. A feed roller assembly for a copper strip electroplating production line as claimed in claim 2, characterized in that: A sponge cleaning mechanism (11) is installed on the front and rear sides of the top support plate (8), and the sponge cleaning mechanism (11) includes a cylinder four (34), a bracket (35) and a sponge strip (36). The cylinder four (34) is fixedly connected to the bracket (35), and the sponge strip (36) is installed at the telescopic end of the cylinder four (34).

4. A feed roller assembly for a copper strip electroplating production line as claimed in claim 3, characterized in that: A sanding belt grinding mechanism (10) is installed at the top end of the top support plate (8), and the sanding belt grinding mechanism (10) comprises a motor fixing plate (28), a sliding seat (25), a screw motor (27), a second fixing frame (26), a first fixing frame (22), a sanding belt (21), a third cylinder (23), a sliding seat (25), and a screw (38); The screw motor (27) is installed on the top of the top support plate (8) through the motor fixing plate (28), the fixing frame 1 (22) and the fixing frame 2 (26) are both installed on the top of the top support plate (8), a sliding rod (37) is fixedly connected between the fixing frame 1 (22) and the fixing frame 2 (26), the sliding seat (25) is slidably connected to the sliding rod (37), the screw rod (38) is threadedly connected to the sliding seat (25), the output shaft of the screw motor (27) is transmission-connected to the screw rod (38), the cylinder 3 (23) is installed on the bottom end of the sliding seat (25), and the sanding belt (21) is installed on the telescopic end of the cylinder 3 (23).

5. A feed roller assembly for a copper strip electroplating production line as claimed in claim 4, characterized in that: The top end of the top support plate (8) is provided with a hollow groove, and the abrasive belt (21) passes through the hollow groove and is located directly above the power supply roller (12).

6. A feed roller assembly for a copper strip electroplating production line as claimed in claim 5, characterized in that: The two sponge cleaning mechanisms (11) are both installed obliquely, and the length of the sponge strip (36) is equal to that of the power supply roller (12).

7. A feed roller assembly for a copper strip electroplating production line as claimed in claim 6, characterized in that: Water retaining plates (32) are provided at both ends of the pressure roller (15), and water retaining rings (33) are provided at both ends of the power supply roller (12).

8. A feed roller assembly for a copper strip electroplating production line as claimed in claim 7, characterized in that: Vertical elliptical holes are provided on both sides of the water tank (3), and the two ends of the pressing roller (15) are interference-connected with the two vertical elliptical holes.

9. A feed roller assembly for a copper strip electroplating production line as claimed in claim 8, characterized in that: The bottom end of the mounting base (1) is provided with multiple layers, and the middle layer at the bottom end of the mounting base (1) is an insulating layer.

10. A feed roller assembly for a copper strip electroplating production line as claimed in claim 9, characterized in that: Rotary joints are installed at both ends of the main shaft (14), the interior of the main shaft (14) is a hollow cavity, the two rotary joints are connected to the hollow cavity, a cooling cavity is opened inside the power feeding roller (12), a cooling hole is opened in the middle of the hollow cavity, and the cooling hole is connected to the cooling cavity.

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