Raw material pretreatment device for production and processing of conveying belt

Abstract

The utility model discloses a raw material pretreatment device for production and processing of a conveying belt, which comprises a machine body, a screening barrel is arranged above the machine body, the machine body is connected with the screening barrel through a spring, a vibration motor is arranged at the bottom of the screening barrel, and the vibration motor is electrically connected with the machine body; a screening net is arranged on the inner side of the screening barrel, a discharging port is formed in the side face of the screening barrel, a sealing cover is arranged at the top of the screening barrel and detachably connected with the screening barrel, and a grinding assembly is arranged in the middle of the sealing cover and used for grinding screened blocky objects. Carbon black or sulfur can be efficiently screened through cooperation of the machine body, the screening barrel and the vibration motor, the screened carbon black and sulfur are guided out, meanwhile, a grinding assembly is installed on a sealing cover of the top of the screening barrel, and after screening is completed, the screened blocky carbon black or sulfur can be screened through the grinding assembly. The carbon black and the sulfur can be fully utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of conveyor belt production, in particular to a raw material pretreatment device for conveyor belt production and processing. Background Art

[0002] The main raw materials for rubber conveyor belts include natural rubber, synthetic rubber, carbon black, sulfur, accelerators, and antioxidants. These raw materials must undergo rigorous testing and screening before production to ensure their quality meets production requirements. Carbon black and sulfur must be in powder form before use, so they must be sieved to separate any agglomerated carbon black and sulfur to prevent them from interfering with subsequent processing. Screening equipment is required to separate the carbon black and sulfur.

[0003] In the prior art, the utility model patent CN202220751461.2 discloses an insoluble sulfur crushing and screening device, comprising a cylindrical shell, a sieve body disposed within the shell, and a crushing unit disposed within the sieve body for crushing sulfur. The shell has an opening at the top for pouring insoluble sulfur, the opening being connected to the sieve body, the sieve body having multiple sieve holes distributed on its sidewalls, a hemispherical receiving trough disposed below the crushing unit, the inner sidewalls of the receiving trough having multiple filter holes distributed therein, and a stirring unit for stirring the insoluble sulfur disposed above the receiving trough. The top cover of the shell is a detachable structure. This sulfur crushing and screening device can achieve the purposes of crushing and screening within a single shell, effectively improving equipment production efficiency and avoiding the generation of dust.

[0004] The sulfur crushing and screening device provided by the aforementioned patent primarily crushes and screens sulfur, improving the efficiency of sulfur crushing and screening. The carbon black and sulfur raw materials used in conveyor belt production are mostly powdered. The reason for further screening of the carbon black and sulfur is to prevent them from forming lumps. Therefore, screening of carbon black and sulfur during conveyor belt production primarily involves screening, with crushing being a secondary priority. Only after the carbon black and sulfur have been screened is the lumpy carbon black and sulfur required to be crushed and ground. Existing sulfur crushing and screening devices primarily function as crushing devices, requiring sulfur to pass through a crushing chamber before screening. Furthermore, the high-speed rotation of the crushing unit causes the powdered carbon black and sulfur to be lifted up, and the lack of a vibration mechanism makes it difficult for the carbon black and sulfur to pass quickly through the crushing chamber. Therefore, existing screening equipment is unsuitable for screening carbon black or sulfur during conveyor belt production. In summary, there is a need for a device that can quickly screen carbon black and sulfur during conveyor belt production. Utility Model Content

[0005] The purpose of the utility model is to provide a raw material pretreatment device for conveyor belt production and processing, aiming to improve the problem that the existing screening equipment is not suitable for screening carbon black or sulfur in the conveyor belt production process, and the structure of its crushing chamber and crushing unit limits the time for powdered carbon black and sulfur to quickly pass through the crushing chamber, affecting the screening efficiency of carbon black and sulfur.

[0006] The utility model is achieved in this way:

[0007] A raw material pretreatment device for conveyor belt production and processing includes a machine body, a screening drum is provided above the machine body, and the machine body and the screening drum are connected by a spring, a vibration motor is provided at the bottom of the screening drum, and the vibration motor is electrically connected to the machine body; a screening mesh is provided on the inner side of the screening drum, a discharge port is provided on the side of the screening drum, a sealing cover is provided on the top of the screening drum, the sealing cover is detachably connected to the screening drum, and a grinding assembly is provided in the middle of the sealing cover, and the grinding assembly is used to grind the block objects screened out.

[0008] Preferably, a control panel is provided on the side of the body, a plurality of supporting feet are evenly provided on the bottom of the body, a connecting wire is provided on the side of the body, an electrical plug is provided at the end of the connecting wire, and a buffer groove is provided on the top of the body to provide space for vibration of the screening drum.

[0009] Preferably, an insert ring is provided on the bottom surface of the screening drum, and an inclined surface is provided on the inner side of the screening drum, and the discharge port is arranged at the bottom end of the inclined surface. A supporting ring is provided on the inner side of the screening drum, and a plurality of limiting holes are evenly provided on the supporting ring. A plurality of limiting grooves are evenly provided on the top of the inner side surface of the screening drum, and a tightening knob is symmetrically provided on the top of the outer side surface of the screening drum for fixing the position of the sealing cover; a connecting line is provided at the end of the vibration motor, and a threaded groove is provided at the position of the alignment spring on the bottom surface of the screening drum.

[0010] Preferably, a stud is provided at the top end of the spring, and the stud is threadedly connected to the thread groove. A chassis is provided at the bottom end of the spring, and a plurality of bolt holes are evenly provided at the edge of the chassis.

[0011] Preferably, the edge of the sieve is provided with a frame, and a plurality of limiting posts are evenly provided on the bottom surface of the frame, and the limiting posts are inserted into limiting holes.

[0012] Preferably, a connecting ring is provided on the bottom surface of the cover, a plurality of limit blocks are evenly provided on the edge of the connecting ring, the limit blocks are engaged in the limit grooves, handles are symmetrically provided on both sides of the upper surface of the cover, and a bearing is provided in the middle of the cover.

[0013] Preferably, the grinding assembly includes a driving motor and a grinding plate, the output end of the driving motor is provided with a transmission shaft, the driving motor is provided with a connecting foot on the upper surface of the cover, the upper surface of the grinding plate is provided with a rotating shaft, the rotating shaft is connected to the cover, and the transmission shaft is plugged into the rotating shaft, and the bottom surface of the grinding plate is provided with a grinding surface.

[0014] Preferably, it also includes a baffle, a socket is provided at the top of the discharge port, the baffle is inserted into the inside of the socket, and clamping edges are symmetrically provided on both sides of the baffle, an end plate is provided at the top of the baffle, a pull ring is provided on the upper surface of the end plate, a positioning plate is provided at one end of the end plate, and a positioning knob is provided on the outer side of the positioning plate, and the positioning knob is used to fix the position of the baffle.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The utility model utilizes the cooperation of the machine body, the screening drum and the vibration motor to efficiently screen the carbon black or sulfur, and output the screened carbon black and sulfur. At the same time, the top cover of the screening drum is equipped with a grinding assembly. After the screening is completed, the grinding assembly can be used to screen the screened lump carbon black or sulfur, ensuring that the carbon black and sulfur can be fully utilized, and avoiding the disadvantage that the lump carbon black needs to be ground and screened separately.

[0017] 2. The baffle of the utility model blocks the discharge port, so that the discharge pipe can be blocked when discharge is not required, and the discharge port can be used flexibly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the utility model as a whole;

[0019] Figure 2 It is a structural diagram of the body of the utility model;

[0020] Figure 3 This is a schematic structural diagram of the screening drum of the utility model at an oblique downward angle from the front end;

[0021] Figure 4 This is a schematic structural diagram of the screening drum of the utility model at an oblique upward viewing angle from the front end;

[0022] Figure 5 It is a structural diagram of the spring of the utility model;

[0023] Figure 6 It is a structural diagram of the screen mesh of the utility model;

[0024] Figure 7 It is a structural diagram of the baffle of the utility model;

[0025] Figure 8It is a structural diagram of the sealing cover of the utility model;

[0026] Figure 9 It is a structural schematic diagram of the grinding assembly of the utility model.

[0027] In the figure: 1. Machine body; 11. Control panel; 12. Support foot; 13. Buffer slot; 14. Electrical connection; 15. Electrical plug; 2. Screening drum; 21. Insert ring; 22. Discharge port; 23. Socket; 24. Inclined surface; 25. Support ring; 26. Limit hole; 27. Limit slot; 28. Press knob; 29. Vibration motor; 291. Connecting wire; 292. Threaded groove; 3. Spring; 31. Stud; 32. Chassis; 3 3. Bolt hole; 4. Screen; 41. Frame; 42. Limiting column; 5. Baffle; 51. Card edge; 52. End plate; 53. Pull ring; 54. Positioning plate; 55. Positioning knob; 6. Cover; 61. Connecting ring; 62. Limiting block; 63. Handle; 64. Bearing; 7. Grinding assembly; 71. Drive motor; 711. Connecting foot; 712. Drive shaft; 72. Grinding plate; 721. Grinding surface; 722. Rotating shaft. DETAILED DESCRIPTION

[0028] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0029] The following is a further description with reference to the accompanying drawings and specific embodiments: Example

[0030] like Figure 1 、 Figure 3 and Figure 4As shown, a raw material pretreatment device for conveyor belt production and processing comprises a body 1, with a screening drum 2 positioned above the body 1. The body 1 and the screening drum 2 are connected by a spring 3. A vibration motor 29 is located at the bottom of the screening drum 2 and is electrically connected to the body 1. This structure facilitates the operation of the vibration motor 29 controlled by the body 1, which drives the screening drum 2 to vibrate. The high-speed vibration of the screening drum 2 allows for rapid vibration screening of sulfur and carbon black powders. A screen 4 is provided on the inside of the screening drum 2 to effectively separate bulk materials from the carbon black and sulfur powders. A discharge port 22 is provided on the side of the screening drum 2 to facilitate the discharge of the separated carbon black and sulfur. A cover 6 is provided on the top of the screening drum 2, which is detachably connected to the screening drum 2, facilitating its flexible installation and removal. A grinding assembly 7 is located in the middle of the cover 6 to grind the separated bulk materials.

[0031] like Figure 2 As shown, a control panel 11 is provided on the side of the machine body 1, which facilitates control of the entire device operation. Multiple legs 12 are evenly distributed on the bottom of the machine body 1, providing stability on a workbench. A power cord 14 is provided on the side of the machine body 1, with a power plug 15 at the end. This connection facilitates powering the machine body 1. A buffer tank 13 is provided at the top of the machine body 1 to provide a vibration space for the screening drum 2.

[0032] like Figure 3 and Figure 4 As shown, the bottom surface of the screening drum 2 is provided with an insert ring 21, and the insert ring 21 is used to be inserted into the inner side of the buffer tank 13. A slope 24 is provided on the inner side of the screening drum 2, and the discharge port 22 is set at the bottom end of the slope 24. The slope 24 is convenient for the smooth discharge of carbon black and sulfur after screening. A supporting ring 25 is provided on the inner side of the screening drum 2, and a plurality of limiting holes 26 are evenly provided on the supporting ring 25. The cooperation between the supporting ring 25 and the limiting holes 26 is convenient for supporting and limiting the screen 4. A plurality of limiting grooves 27 are evenly provided on the top of the inner side of the screening drum 2, and the limiting grooves 27 are used to limit the cover 6. A tightening knob 28 is symmetrically provided on the top of the outer side of the screening drum 2 for fixing the position of the cover 6; a connecting line 291 is provided at the end of the vibration motor 29, and the connecting line 291 is used to electrically connect the vibration motor 29 with the body 1. A threaded groove 292 is provided on the bottom surface of the screening drum 2 so as to align with the spring 3 , and the threaded groove 292 facilitates connection with the spring 3 .

[0033] like Figure 5 As shown, a stud 31 is provided at the top of the spring 3, and the stud 31 is threadedly connected to the thread groove 292. A chassis 32 is provided at the bottom of the spring 3, and a plurality of bolt holes 33 are evenly provided on the edge of the chassis 32; the cooperation between the chassis 32 and the bolt holes 33 is convenient for fixing the position of the spring 3 by bolts.

[0034] like Figure 6 As shown, a frame 41 is provided on the edge of the sieve 4, and a plurality of limiting posts 42 are evenly provided on the bottom surface of the frame 41, and the limiting posts 42 are inserted into the limiting holes 26; this structure ensures the stability of the sieve 4 and also ensures that the sieve 4 will not rotate with the grinding assembly 7.

[0035] like Figure 8 As shown, the bottom surface of the cover 6 is provided with a connecting ring 61. Multiple stoppers 62 are evenly spaced along the edge of the connecting ring 61. The stoppers 62 engage in the stopper grooves 27. This structure facilitates the stable sealing of the cover 6 against the top opening of the screening drum 2. Handles 63 are symmetrically provided on both sides of the top surface of the cover 6 to facilitate assembly and disassembly of the cover 6. A bearing 64 is provided in the middle of the cover 6 for rotational connection with the grinding plate 72.

[0036] like Figure 9 As shown, the grinding assembly 7 includes a drive motor 71 and a grinding plate 72. A drive shaft 712 is provided at the output end of the drive motor 71. The drive motor 71 drives the grinding plate 72 to rotate, facilitating grinding of lump sulfur or carbon black. The drive motor 71 is provided with connecting legs 711 on the upper surface of the cover 6, which facilitate securing the drive motor 71. A rotating shaft 722 is provided on the upper surface of the grinding plate 72, which is connected to the cover 6 and facilitates rotation of the grinding plate 72. The drive shaft 712 and the rotating shaft 722 are plugged into each other. The bottom surface of the grinding plate 72 is provided with a grinding surface 721, which facilitates efficient grinding of carbon black and sulfur.

[0037] Working principle: When in use, turn on the entire equipment and operate it, then pour the carbon black or sulfur to be screened into the screening cylinder 2. Under the action of the vibration motor 29, the carbon black or sulfur can be quickly screened. After the screening is completed, the screened lump carbon black or sulfur will be retained on the screen 4. At this time, the staff will cover the grinding component 7 with the cover 6 mechanism at the top opening of the screening cylinder 2, and power on the motor. At the same time, hold the cover 6 with both hands and apply a certain downward pressure on the cover 6. At this time, the grinding plate 72 will grind the lump carbon black or sulfur until the carbon black and sulfur completely pass through the screen 4. Compared with the prior art, the present application utilizes the cooperation of the machine body 1, the screening drum 2 and the vibration motor 29 to efficiently screen carbon black or sulfur, and to export the screened carbon black and sulfur. At the same time, the top cover 6 of the screening drum 2 is installed with a grinding assembly 7. After the screening is completed, the grinding assembly 7 can be used to screen the screened lump carbon black or sulfur, ensuring that the carbon black and sulfur can be fully utilized, and avoiding the disadvantage that the lump carbon black needs to be ground and screened separately.

[0038] Example 2

[0039] like Figure 1 、 Figure 3 and Figure 4 As shown, a raw material pretreatment device for conveyor belt production and processing comprises a body 1, with a screening drum 2 positioned above the body 1. The body 1 and the screening drum 2 are connected by a spring 3. A vibration motor 29 is located at the bottom of the screening drum 2 and is electrically connected to the body 1. This structure facilitates the operation of the vibration motor 29 controlled by the body 1, which drives the screening drum 2 to vibrate. The high-speed vibration of the screening drum 2 allows for rapid vibration screening of sulfur and carbon black powders. A screen 4 is provided on the inside of the screening drum 2 to effectively separate bulk materials from the carbon black and sulfur powders. A discharge port 22 is provided on the side of the screening drum 2 to facilitate the discharge of the separated carbon black and sulfur. A cover 6 is provided on the top of the screening drum 2, which is detachably connected to the screening drum 2, facilitating its flexible installation and removal. A grinding assembly 7 is located in the middle of the cover 6 to grind the separated bulk materials.

[0040] like Figure 2 As shown, a control panel 11 is provided on the side of the machine body 1, which facilitates control of the entire device operation. Multiple legs 12 are evenly distributed on the bottom of the machine body 1, providing stability on a workbench. A power cord 14 is provided on the side of the machine body 1, with a power plug 15 at the end. This connection facilitates powering the machine body 1. A buffer tank 13 is provided at the top of the machine body 1 to provide a vibration space for the screening drum 2.

[0041] like Figure 3 and Figure 4 As shown, the bottom surface of the screening drum 2 is provided with an insert ring 21, and the insert ring 21 is used to be inserted into the inner side of the buffer tank 13. A slope 24 is provided on the inner side of the screening drum 2, and the discharge port 22 is set at the bottom end of the slope 24. The slope 24 is convenient for the smooth discharge of carbon black and sulfur after screening. A supporting ring 25 is provided on the inner side of the screening drum 2, and a plurality of limiting holes 26 are evenly provided on the supporting ring 25. The cooperation between the supporting ring 25 and the limiting holes 26 is convenient for supporting and limiting the screen 4. A plurality of limiting grooves 27 are evenly provided on the top of the inner side of the screening drum 2, and the limiting grooves 27 are used to limit the cover 6. A tightening knob 28 is symmetrically provided on the top of the outer side of the screening drum 2 for fixing the position of the cover 6; a connecting line 291 is provided at the end of the vibration motor 29, and the connecting line 291 is used to electrically connect the vibration motor 29 with the body 1. A threaded groove 292 is provided on the bottom surface of the screening drum 2 so as to align with the spring 3 , and the threaded groove 292 facilitates connection with the spring 3 .

[0042] like Figure 5As shown, a stud 31 is provided at the top of the spring 3, and the stud 31 is threadedly connected to the thread groove 292. A chassis 32 is provided at the bottom of the spring 3, and a plurality of bolt holes 33 are evenly provided on the edge of the chassis 32; the cooperation between the chassis 32 and the bolt holes 33 is convenient for fixing the position of the spring 3 by bolts.

[0043] like Figure 6 As shown, a frame 41 is provided on the edge of the sieve 4, and a plurality of limiting posts 42 are evenly provided on the bottom surface of the frame 41, and the limiting posts 42 are inserted into the limiting holes 26; this structure ensures the stability of the sieve 4 and also ensures that the sieve 4 will not rotate with the grinding assembly 7.

[0044] like Figure 8 As shown, the bottom surface of the cover 6 is provided with a connecting ring 61. Multiple stoppers 62 are evenly spaced along the edge of the connecting ring 61. The stoppers 62 engage in the stopper grooves 27. This structure facilitates the stable sealing of the cover 6 against the top opening of the screening drum 2. Handles 63 are symmetrically provided on both sides of the top surface of the cover 6 to facilitate assembly and disassembly of the cover 6. A bearing 64 is provided in the middle of the cover 6 for rotational connection with the grinding plate 72.

[0045] like Figure 9 As shown, the grinding assembly 7 includes a drive motor 71 and a grinding plate 72. A drive shaft 712 is provided at the output end of the drive motor 71. The drive motor 71 drives the grinding plate 72 to rotate, facilitating grinding of lump sulfur or carbon black. The drive motor 71 is provided with connecting legs 711 on the upper surface of the cover 6, which facilitate securing the drive motor 71. A rotating shaft 722 is provided on the upper surface of the grinding plate 72, which is connected to the cover 6 and facilitates rotation of the grinding plate 72. The drive shaft 712 and the rotating shaft 722 are plugged into each other. The bottom surface of the grinding plate 72 is provided with a grinding surface 721, which facilitates efficient grinding of carbon black and sulfur.

[0046] like Figure 7 As shown, the baffle 5 is also included. The top of the discharge port 22 is provided with a socket 23, and the baffle 5 is inserted into the inner side of the socket 23. This structure facilitates the baffle 5 to engage with the socket 23 to block the discharge port 22. The baffle 5 is also symmetrically provided with a clamping edge 51 on both sides, which facilitates the position of the baffle 5. The baffle 5 is provided with an end plate 52 at the top, and a pull ring 53 is provided on the upper surface of the end plate 52. The end plate 52 and the pull ring 53 facilitate the assembly and disassembly of the baffle 5. A positioning plate 54 is provided at one end of the end plate 52, and a positioning knob 55 is provided on the outer side of the positioning plate 54. The positioning knob 55 is used to fix the position of the baffle 5.

[0047] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A raw material pretreatment device for conveyor belt production and processing, comprising a body (1), characterized in that: A screening drum (2) is provided above the machine body (1), and the machine body (1) and the screening drum (2) are connected via a spring (3). A vibration motor (29) is provided at the bottom of the screening drum (2), and the vibration motor (29) is electrically connected to the machine body (1); a screening mesh (4) is provided on the inner side of the screening drum (2), a discharge port (22) is provided on the side of the screening drum (2), a cover (6) is provided on the top of the screening drum (2), the cover (6) is detachably connected to the screening drum (2), and a grinding assembly (7) is provided in the middle of the cover (6), and the grinding assembly (7) is used to grind the block objects screened out.

2. A raw material pretreatment device for conveyor belt production and processing according to claim 1, characterized in that: A control panel (11) is provided on the side of the machine body (1), a plurality of legs (12) are evenly arranged on the bottom surface of the machine body (1), a connection wire (14) is provided on the side of the machine body (1), and an electric plug (15) is provided at the end of the connection wire (14), and a buffer groove (13) is provided on the top of the machine body (1) for providing a vibration space for the screening drum (2).

3. A raw material pretreatment device for conveyor belt production and processing according to claim 1, characterized in that: The bottom surface of the screening drum (2) is provided with an insert ring (21), and the inner side of the screening drum (2) is provided with an inclined surface (24), and the discharge port (22) is set at the bottom end of the inclined surface (24). The inner side of the screening drum (2) is provided with a supporting ring (25), and a plurality of limiting holes (26) are evenly provided on the supporting ring (25). The top of the inner side surface of the screening drum (2) is evenly provided with a plurality of limiting grooves (27). The top of the outer side surface of the screening drum (2) is symmetrically provided with a tightening knob (28) for fixing the position of the cover (6); the end of the vibration motor (29) is provided with a connecting line (291), and the bottom surface of the screening drum (2) is provided with a threaded groove (292) at the position where the spring (3) is aligned.

4. A raw material pretreatment device for conveyor belt production and processing according to claim 3, characterized in that: The top end of the spring (3) is provided with a stud (31), and the stud (31) is threadedly connected to the thread groove (292). The bottom end of the spring (3) is provided with a chassis (32), and the edge of the chassis (32) is evenly provided with multiple bolt holes (33).

5. The raw material pretreatment device for conveyor belt production and processing according to claim 3, characterized in that: The edge of the sieve (4) is provided with a frame (41), and the bottom surface of the frame (41) is evenly provided with a plurality of limiting posts (42), and the limiting posts (42) are inserted into the limiting holes (26).

6. A raw material pretreatment device for conveyor belt production and processing according to claim 3, characterized in that: The bottom surface of the cover (6) is provided with a connecting ring (61), and the edge of the connecting ring (61) is evenly provided with a plurality of limiting blocks (62), and the limiting blocks (62) are engaged in the limiting grooves (27). Handles (63) are symmetrically provided on both sides of the upper surface of the cover (6), and a bearing (64) is provided in the middle of the cover (6).

7. A raw material pretreatment device for conveyor belt production and processing according to any one of claims 1 to 6, characterized in that: The grinding assembly (7) comprises a driving motor (71) and a grinding plate (72), wherein the output end of the driving motor (71) is provided with a transmission shaft (712), the driving motor (71) is provided with a connecting foot (711) which is attached to the upper surface of the cover (6), the upper surface of the grinding plate (72) is provided with a rotating shaft (722), the rotating shaft (722) is connected to the cover (6), and the driving shaft (712) is connected to the rotating shaft (722) by plugging, and the bottom surface of the grinding plate (72) is provided with a grinding surface (721).

8. A raw material pretreatment device for conveyor belt production and processing according to any one of claims 1 to 6, characterized in that: The baffle (5) is also included. The top of the discharge port (22) is provided with a socket (23). The baffle (5) is inserted into the inner side of the socket (23). The baffle (5) is symmetrically provided with clamping edges (51) on both sides of the baffle (5). The top of the baffle (5) is provided with an end plate (52). The upper surface of the end plate (52) is provided with a pull ring (53). One end of the end plate (52) is provided with a positioning plate (54). The outer side surface of the positioning plate (54) is provided with a positioning knob (55). The positioning knob (55) is used to fix the position of the baffle (5).

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