Waste recycling device in lignin preparation process

Abstract

The invention discloses a lignin preparation process waste recycling device which comprises a processing box, a motor is fixedly connected to the side wall of the processing box, a transmission rod is fixedly connected to the output end of the motor, the transmission rod penetrates through the processing box and is rotationally connected with the processing box, and a plurality of smashing blades are fixedly connected to the outer wall of the transmission rod. A cutting mechanism is arranged on the feeding hopper, a smashing mechanism is arranged in the processing box, and two cleaning mechanisms which are symmetrically arranged are arranged in the processing box. Through cooperative operation of multiple assemblies, efficient treatment of the lignin waste is achieved; the cutting mechanism is linked with the crushing mechanism, so that the waste can be accurately cut and crushed, and the pretreatment efficiency is effectively improved; the cleaning mechanism timely clears residues on the crushing roller to guarantee stable crushing effect, and meanwhile, the drying system dries while stirring to guarantee uniform drying of the waste; manual intervention is reduced through full-process automatic operation, the production efficiency is improved, and high-value recycling of the lignin waste is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste utilization, and in particular to a device for reusing waste generated in the lignin preparation process. Background Art

[0002] Under the background that the concepts of resource recycling and green environmental protection are increasingly deeply rooted in people's hearts, the treatment and reuse of waste generated in the lignin preparation process (such as unreacted lignocellulose, residues after lignin extraction, etc.) have received extensive attention. Effectively treating these wastes and converting them into utilizable resources can not only reduce the environmental pressure caused by waste, but also achieve the efficient utilization of resources, reduce production costs, and meet the strategic needs of sustainable development.

[0003] In the waste pretreatment stage of the existing device for reusing waste generated in the lignin preparation process, traditional treatment equipment has a single function, mostly only having the functions of crushing or cutting, and it is difficult to achieve refined segmented treatment of long-volume solid waste, which greatly affects the efficiency and quality of subsequent processing and limits the effective utilization of lignin waste; therefore, we designed a device for reusing waste generated in the lignin preparation process to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art, and to propose a device for reusing waste generated in the lignin preparation process, which realizes the efficient treatment of lignin waste through the coordinated operation of multiple components; the cutting mechanism and the crushing mechanism are linked, which can accurately cut and crush the waste, effectively improving the pretreatment efficiency; the cleaning mechanism timely removes the residues on the crushing rollers to ensure the stable crushing effect, and at the same time the drying system dries while stirring to ensure uniform drying of the waste; the whole process is automated to reduce manual intervention, improve production efficiency, and realize the high-value reuse of lignin waste.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A device for reusing waste materials in the lignin preparation process, including a processing box. A feed hopper is fixedly communicated with the top of the processing box. A motor is fixedly connected to the side wall of the processing box. The output end of the motor is fixedly connected to a transmission rod. The transmission rod penetrates through the processing box and is rotatably connected thereto. A plurality of crushing blades are fixedly connected to the outer wall of the transmission rod. A cutting mechanism is provided on the feed hopper. A crushing mechanism is provided in the processing box. Two cleaning mechanisms are symmetrically arranged in the processing box. A V-shaped plate is fixedly connected to the inner wall of the processing box. A first discharge hopper is fixedly communicated with the bottom of the V-shaped plate. A hollow rod is rotatably provided through the processing box. A plurality of hollow stirring rods are fixedly communicated with the outer wall of the hollow rod. An electric hot air blower is fixedly connected to the side wall of the processing box. The output end of the electric hot air blower is fixedly communicated with a delivery pipe. A rotary joint is jointly installed at the end of the hollow rod and the end of the delivery pipe. A second discharge hopper is fixedly communicated with the bottom of the processing box. A control panel is fixedly connected to the front of the processing box.

[0007] Preferably, the cutting mechanism includes a reciprocating lead screw arranged above the processing box. A first synchronous belt is jointly sleeved on the outer walls of the transmission rod and the reciprocating lead screw. A first fixing block is fixedly connected to the top of the processing box. The reciprocating lead screw penetrates through the first fixing block and is rotatably connected thereto. The end of the reciprocating lead screw is rotatably connected to the side wall of the feed hopper. A reciprocating moving plate is sleeved on the outer wall of the reciprocating lead screw. A groove is opened on the top of the processing box. Two sliding rods are fixedly connected to the inner wall of the groove. Both sliding rods penetrate through the reciprocating moving plate and are slidably connected thereto. A cutting blade is fixedly connected to the end of the reciprocating moving plate close to the feed hopper. A through hole is penetrated through the feed hopper. The cutting blade penetrates through the through hole and the outer wall of the cutting blade is hermetically arranged with the inner wall of the through hole.

[0008] Preferably, the crushing mechanism includes a rotating rod arranged at the rear of the processing box. A second synchronous belt is jointly sleeved on the outer walls of the transmission rod and the rotating rod. Two second fixing blocks are fixedly connected to the rear end of the processing box. The rotating rod penetrates through the two second fixing blocks and is rotatably connected thereto. Two driving bevel gears are fixedly connected to the outer wall of the rotating rod. Each driving bevel gear meshes with a driven bevel gear. Each driven bevel gear is coaxially fixedly connected to a rotating rod. Each rotating rod penetrates through the processing box and is rotatably connected thereto. A crushing roller is fixedly connected to the outer wall of each rotating rod.

[0009] Preferably, the cleaning mechanism includes a brush plate arranged in a processing box, a plurality of brushes are provided at one end of the brush plate close to the crushing roller, and the plurality of brushes are arranged against the outer wall of the crushing roller, and two telescopic rods are fixedly connected to one end of the brush plate close to the inner wall of the processing box, and the two telescopic rods are fixedly connected to the inner wall of the processing box, a threaded rod threadedly connected to the processing box passes through the processing box, the threaded rod is rotatably connected to the side wall of the brush plate, and a handle is fixedly connected to one end of the threaded rod away from the brush plate.

[0010] Preferably, the outer wall of the transmission rod and the outer wall of the reciprocating screw rod are both fixedly connected with the first pulley, the first synchronous belt is sleeved on the outer walls of the two first pulleys, the outer wall of the transmission rod and the outer wall of the rotating rod are both fixedly connected with the second pulley, the second synchronous belt is sleeved on the outer walls of the two second pulleys, the outer wall of the transmission rod and the outer wall of the hollow rod are both fixedly connected with the third pulley, and the two third pulleys are jointly sleeved with the third synchronous belt.

[0011] Preferably, a first electromagnetic valve is fixedly connected to the outer wall of the first discharge hopper, and a second electromagnetic valve is fixedly connected to the outer wall of the second discharge hopper.

[0012] Preferably, the hollow rod is connected to a delivery pipe, and the hollow rod is connected to a plurality of hollow stirring rods.

[0013] Preferably, each of the hollow stirring rods is provided with a plurality of heat dissipation holes, and the plurality of heat dissipation holes are distributed at equal intervals.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The cutting mechanism at the feed hopper cuts and segments the long waste, the crushing mechanism composed of the crushing roller crushes the blocky waste, and the crushing blade further cuts and crushes the waste. The multi-stage treatment method effectively improves the efficiency and quality of waste crushing, which is convenient for subsequent processing and utilization.

[0016] 2. The setting of the cleaning mechanism can clean the outer wall of the crushing roller with a brush to ensure the cleanliness of the crushing roller surface, maintain its good crushing effect, and avoid waste residue affecting the equipment's operating performance and processing quality.

[0017] 3. In the cleaning mechanism, the staff can rotate the handle to drive the threaded rod to rotate, thereby adjusting the distance between the brush plate and the crushing roller, changing the contact force between the brush and the outer wall of the crushing roller, and realizing precise adjustment of the cleaning effect of the outer wall of the crushing roller.

[0018] 4. The device generates hot air through an electric heating fan, which is discharged through a conveying pipe, a hollow rod, a hollow stirring rod and heat dissipation holes to dry the waste. At the same time, the hollow stirring rod rotates under the drive of a transmission rod to stir the waste, enabling the hot air to fully contact the waste, significantly improving the drying effect and ensuring uniform drying of the waste.

[0019] 5. The waste after a series of treatments such as crushing and drying can be used to manufacture feed, etc. The waste in the lignin preparation process is effectively recycled, improving the resource utilization rate, reducing waste emissions, and having both economic and environmental benefits.

[0020] In summary, the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a front view structural schematic diagram of a waste recycling device in the lignin preparation process proposed by the present invention;

[0022] Figure 2 is a rear view structural schematic diagram of a waste recycling device in the lignin preparation process proposed by the present invention;

[0023] Figure 3 is a first cross-sectional schematic diagram of a waste recycling device in the lignin preparation process proposed by the present invention;

[0024] Figure 4 is a second cross-sectional schematic diagram of a waste recycling device in the lignin preparation process proposed by the present invention.

[0025] In the figure: 1 processing box, 2 feed hopper, 3 motor, 4 transmission rod, 5 crushing blade, 6 first synchronous belt, 7 reciprocating lead screw, 8 first fixing block, 9 reciprocating moving plate, 10 sliding rod, 11 cutting blade, 12 second synchronous belt, 13 rotating rod, 14 second fixing block, 15 driving bevel gear, 16 driven bevel gear, 17 rotating rod, 18 crushing roller, 19 brush plate, 20 telescopic rod, 21 threaded rod, 22 handle, 23 V-shaped plate, 24 first discharge hopper, 25 third synchronous belt, 26 hollow rod, 27 hollow stirring rod, 28 electric heating fan, 29 conveying pipe, 30 rotary joint, 31 heat dissipation hole, 32 second discharge hopper, 33 control panel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0027] Refer to Figures 1 - 4, A device for reusing waste in the lignin preparation process, including a processing box 1. A feed hopper 2 is fixedly communicated with the top of the processing box 1. The feed hopper 2 is used to guide the lignin residue fixed waste into the processing box 1. A motor 3 is fixedly connected to the side wall of the processing box 1. The output end of the motor 3 is fixedly connected to a transmission rod 4. The transmission rod 4 penetrates through the processing box 1 and is rotatably connected thereto. A plurality of crushing blades 5 are fixedly connected to the outer wall of the transmission rod 4. The transmission rod 4 drives the crushing blades 5 to rotate to realize the cutting and crushing of the waste.

[0028] A cutting mechanism is provided on the feed hopper 2. The cutting mechanism includes a reciprocating lead screw 7 arranged above the processing box 1. A first synchronous belt 6 is sleeved on the outer walls of both the transmission rod 4 and the reciprocating lead screw 7. First belt pulleys are fixedly connected to the outer walls of both the transmission rod 4 and the reciprocating lead screw 7. The first synchronous belt 6 is sleeved on the outer walls of the two first belt pulleys. A first fixing block 8 is fixedly connected to the top of the processing box 1. The reciprocating lead screw 7 penetrates through the first fixing block 8 and is rotatably connected thereto. The end of the reciprocating lead screw 7 is rotatably connected to the side wall of the feed hopper 2. A reciprocating moving plate 9 is sleeved on the outer wall of the reciprocating lead screw 7. The reciprocating lead screw 7 drives the reciprocating moving plate 9 to reciprocate along its axis through screw transmission. A groove is opened on the top of the processing box 1. Two sliding rods 10 are fixedly connected to the inner wall of the groove. Both of the two sliding rods 10 penetrate through the reciprocating moving plate 9 and are slidably connected thereto. The two sliding rods 10 play a guiding role for the reciprocating moving plate 9, restricting it to slide only along the direction of the sliding rods 10. One end of the reciprocating moving plate 9 close to the feed hopper 2 is fixedly connected to a cutting blade 11. A through hole is penetrated through the feed hopper 2. The cutting blade 11 penetrates through the through hole and the outer wall of the cutting blade 11 is hermetically arranged with the inner wall of the through hole. The reciprocating moving plate 9 drives the cutting blade 11 to reciprocate to cut the waste in the feed hopper 2.

[0029] A crushing mechanism is provided in the processing box 1. The crushing mechanism includes a rotating rod 13 arranged at the rear side of the processing box 1. A second synchronous belt 12 is sleeved on the outer walls of both the transmission rod 4 and the rotating rod 13. Second belt pulleys are fixedly connected to the outer walls of both the transmission rod 4 and the rotating rod 13. The second synchronous belt 12 is sleeved on the outer walls of the two second belt pulleys. Two second fixing blocks 14 are fixedly connected to the rear end of the processing box 1. The rotating rod 13 penetrates through the two second fixing blocks 14 and is rotatably connected thereto. Two driving bevel gears 15 are fixedly connected to the outer wall of the rotating rod 13. Each driving bevel gear 15 meshes with a driven bevel gear 16. Each driven bevel gear 16 is coaxially fixedly connected to a rotating rod 17. Each rotating rod 17 penetrates through the processing box 1 and is rotatably connected thereto. A crushing roller 18 is fixedly connected to the outer wall of each rotating rod 17. The rotating rod 17 drives the crushing roller 18 to rotate to perform crushing treatment on the waste.

[0030] There are two cleaning mechanisms symmetrically arranged in the processing box 1. The cleaning mechanism includes a brush plate 19 arranged in the processing box 1. One end of the brush plate 19 close to the crushing roller 18 is provided with a plurality of brushes. The brush plate 19 is used for installing the brushes to clean the outer wall of the crushing roller 18. A plurality of brushes are all abutted against the outer wall of the crushing roller 18. By the contact between the brushes and the outer wall of the crushing roller 18, the residual waste on its surface is removed. One end of the brush plate 19 close to the inner wall of the processing box 1 is fixedly connected with two telescopic rods 20. Both telescopic rods 20 are fixedly connected with the inner wall of the processing box 1. The telescopic rods 20 telescopically move correspondingly when the brush plate 19 moves, playing a guiding role. A threaded rod 21 threadedly connected with the processing box 1 penetrates through the processing box 1. The threaded rod 21 is rotatably connected with the side wall of the brush plate 19. One end of the threaded rod 21 away from the brush plate 19 is fixedly connected with a handle 22. The staff drives the threaded rod 21 to rotate by rotating the handle 22 to adjust the position of the brush plate 19.

[0031] The inner wall of the processing box 1 is fixedly connected with a V-shaped plate 23. The bottom of the V-shaped plate 23 is fixedly communicated with a first discharge hopper 24. The inner bottom of the V-shaped plate 23 is concave on both sides. The V-shaped plate 23 is used for collecting the crushed waste and guiding it to move towards the first discharge hopper 24. The outer wall of the first discharge hopper 24 is fixedly connected with a first electromagnetic valve. The first electromagnetic valve controls the on-off of the first discharge hopper 24 to control the discharge of the waste. A hollow rod 26 rotatably connected with the processing box 1 penetrates through the processing box 1. A third pulley is fixedly connected to the outer wall of the transmission rod 4 and the outer wall of the hollow rod 26. The two third pulleys are jointly sleeved with a third synchronous belt 25. A plurality of hollow stirring rods 27 are fixedly communicated with the outer wall of the hollow rod 26. The hollow rod 26 drives the hollow stirring rods 27 to rotate to stir the waste. The hollow rod 26 is communicated with the plurality of hollow stirring rods 27. A hot air blower 28 is fixedly connected to the side wall of the processing box 1. The hot air blower 28 generates hot air to provide a heat source for drying the waste. The output end of the hot air blower 28 is fixedly communicated with a conveying pipe 29. A rotary joint 30 is jointly installed at the end of the hollow rod 26 and the end of the conveying pipe 29. The hollow rod 26 is communicated with the conveying pipe 29. The rotary joint 30 ensures that the hot air can be smoothly conveyed to the hollow stirring rods 27 when the hollow rod 26 rotates. A plurality of heat dissipation holes 31 are respectively formed through each hollow stirring rod 27. The plurality of heat dissipation holes 31 are equidistantly distributed. The heat dissipation holes 31 are used for discharging the hot air to dry the waste. The bottom of the processing box 1 is fixedly communicated with a second discharge hopper 32. The outer wall of the second discharge hopper 32 is fixedly connected with a second electromagnetic valve. A control panel 33 is fixedly connected to the front of the processing box 1. The control panel 33 is used to control the operation of components such as the motor 3, the hot air blower 28, the first electromagnetic valve and the second electromagnetic valve.

[0032] In the present invention, the staff injects the lignin residue fixed waste (uncompletely reacted wood fiber, residue after lignin extraction) into the processing box 1 through the feed hopper 2 for processing, starts the motor 3 and the electric heating fan 28, and drives the transmission rod 4, the first synchronous belt 6, and the reciprocating screw 7 to rotate through the output end of the motor 3, which can drive the reciprocating plate 9 to slide on the two sliding rods 10 and the reciprocating plate 9 drives the cutting blade 11 to reciprocate. The reciprocating movement of the cutting blade 11 can cut the lignin residue fixed waste injected into the feed hopper 2, and the long The solid waste of volume is cut into multiple sections; the second synchronous belt 12, the rotating rod 13, the two active bevel gears 15, the driven bevel gear 16, the rotating rod 17 and the crushing roller 18 are driven to rotate by the rotation of the transmission rod 4. The fallen block-shaped fixed waste can be crushed by the relative rotation of the two crushing rollers 18, which is convenient for subsequent cutting and crushing; the outer wall of the crushing roller 18 can be cleaned by the brush plates 19 arranged on both sides and the brushes installed on the brush plates 19, which ensures the cleanliness of the surface of the crushing roller 18 and the good subsequent crushing effect; finally, the crushed solid waste is accumulated on the V-shaped plate 23 The transmission rod 4 rotates to drive the plurality of pulverizing blades 5 to rotate, so that the solid waste can be cut and crushed. After the crushing is completed, the electromagnetic valve is opened to accumulate the crushed waste at the bottom of the processing box 1; the electric hot air blower 28 can generate hot air, and the hot air passes through the conveying pipe 29, the hollow rod 26, and the plurality of hollow stirring rods 27, and finally the hot air is discharged through the plurality of heat dissipation holes 31, so that the waste accumulated at the bottom of the processing box 1 can be dried. The transmission rod 4 rotates to drive the third synchronous belt 25, the hollow rod 26, and the plurality of hollow stirring rods 27 to rotate, so that the waste can be stirred. The second electromagnetic valve is opened to discharge the processed waste, which can be used to make feed and reuse the lignin waste. The staff holds the handle 22 and rotates it to drive the threaded rod 21 to rotate, and the threaded rod 21 rotates and moves at the same time, and the brush plate 19 is driven to move by the movement of the threaded rod 21, and the telescopic rod 20 is correspondingly extended and retracted during this process, thereby adjusting the distance between the brush plate 19 and the crushing roller 18, and adjusting the contact force between the brush and the outer wall of the crushing roller 18, so as to achieve a good cleaning effect on the outer wall of the crushing roller 18.

[0033] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for recycling waste materials in the lignin preparation process, comprising a processing box (1), characterized in that, The top of the processing box (1) is fixedly communicated with a feed hopper (2). The side wall of the processing box (1) is fixedly connected with a motor (3). The output end of the motor (3) is fixedly connected with a transmission rod (4). The transmission rod (4) penetrates through the processing box (1) and is rotatably connected thereto. A plurality of crushing blades (5) are fixedly connected to the outer wall of the transmission rod (4). A cutting mechanism is provided on the feed hopper (2). A crushing mechanism is provided in the processing box (1). Two cleaning mechanisms are symmetrically arranged in the processing box (1). The inner wall of the processing box (1) is fixedly connected with a V-shaped plate (23). The bottom of the V-shaped plate (23) is fixedly communicated with a first discharge hopper (24). A hollow rod (26) rotatably connected to the processing box (1) penetrates through the processing box (1). A plurality of hollow stirring rods (27) are fixedly communicated with the outer wall of the hollow rod (26). The side wall of the processing box (1) is fixedly connected with a hot air blower (28). The output end of the hot air blower (28) is fixedly communicated with a delivery pipe (29). A rotary joint (30) is jointly installed at the end of the hollow rod (26) and the end of the delivery pipe (29). The bottom of the processing box (1) is fixedly communicated with a second discharge hopper (32). The front of the processing box (1) is fixedly connected with a control panel (33).

2. The waste recycling device for the lignin preparation process according to claim 1, characterized in that, The cutting mechanism includes a reciprocating lead screw (7) arranged above the processing box (1). A first synchronous belt (6) is jointly sleeved on the outer walls of the transmission rod (4) and the reciprocating lead screw (7). The top of the processing box (1) is fixedly connected with a first fixing block (8). The reciprocating lead screw (7) penetrates through the first fixing block (8) and is rotatably connected thereto. The end of the reciprocating lead screw (7) is rotatably connected to the side wall of the feed hopper (2). A reciprocating moving plate (9) is sleeved on the outer wall of the reciprocating lead screw (7). A groove is formed in the top of the processing box (1). Two sliding rods (10) are fixedly connected to the inner wall of the groove. Both of the two sliding rods (10) penetrate through the reciprocating moving plate (9) and are slidably connected thereto. One end of the reciprocating moving plate (9) close to the feed hopper (2) is fixedly connected with a cutting blade (11). A through hole is formed through the feed hopper (2). The cutting blade (11) penetrates through the through hole and the outer wall of the cutting blade (11) is hermetically arranged with the inner wall of the through hole.

3. The waste reuse device for lignin preparation process according to claim 2, characterized in that, The crushing mechanism includes a rotating rod (13) arranged at the rear side of the processing box (1). A second synchronous belt (12) is sleeved on the outer walls of the transmission rod (4) and the rotating rod (13). Two second fixing blocks (14) are fixedly connected to the rear end of the processing box (1). The rotating rod (13) penetrates through the two second fixing blocks (14) and is rotatably connected thereto. Two driving bevel gears (15) are fixedly connected to the outer wall of the rotating rod (13). Each driving bevel gear (15) is engaged with a driven bevel gear (16). Each driven bevel gear (16) is coaxially fixedly connected with a rotating rod (17). Each rotating rod (17) penetrates through the processing box (1) and is rotatably connected thereto. A crushing roller (18) is fixedly connected to the outer wall of each rotating rod (17).

4. A device for recycling waste in the lignin preparation process according to claim 1, characterized in that, The cleaning mechanism includes a brush plate (19) arranged in the processing box (1). A plurality of brushes are arranged at one end of the brush plate (19) close to the crushing roller (18). The plurality of brushes are all abutted against the outer wall of the crushing roller (18). Two telescopic rods (20) are fixedly connected to one end of the brush plate (19) close to the inner wall of the processing box (1). The two telescopic rods (20) are both fixedly connected to the inner wall of the processing box (1). A threaded rod (21) threadedly connected to the processing box (1) is arranged through the processing box (1). The threaded rod (21) is rotatably connected to the side wall of the brush plate (19). A handle (22) is fixedly connected to one end of the threaded rod (21) away from the brush plate (19).

5. A waste reuse device for the lignin preparation process according to claim 1, characterized in that, First pulleys are fixedly connected to the outer walls of the transmission rod (4) and the reciprocating screw rod (7). The first synchronous belt (6) is sleeved on the outer walls of the two first pulleys. Second pulleys are fixedly connected to the outer walls of the transmission rod (4) and the rotating rod (13). The second synchronous belt (12) is sleeved on the outer walls of the two second pulleys. Third pulleys are fixedly connected to the outer walls of the transmission rod (4) and the hollow rod (26). A third synchronous belt (25) is sleeved on the two third pulleys.

6. A waste reuse device for the lignin preparation process according to claim 3, characterized in that, A first electromagnetic valve is fixedly connected to the outer wall of the first discharge hopper (24). A second electromagnetic valve is fixedly connected to the outer wall of the second discharge hopper (32).

7. A device for recycling waste in the lignin preparation process according to claim 1, characterized in that, The hollow rod (26) is communicated with the conveying pipe (29). The hollow rod (26) is communicated with a plurality of hollow stirring rods (27).

8. A device for reusing waste materials in the lignin preparation process according to claim 1, characterized in that, A plurality of heat dissipation holes (31) are formed through each hollow stirring rod (27). The plurality of heat dissipation holes (31) are distributed at equal intervals.

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