Sliding keyboard for computer science and technology teaching

Abstract

The invention provides a sliding keyboard for computer science and technology teaching, and belongs to the technical field of keyboards. Comprising a hollow bin and a dustproof mechanism, a displayer is installed on the top of the hollow bin, the dustproof mechanism comprises an installation block, the installation block is installed on the side wall of the interior of the hollow bin, a connecting wheel is rotatably installed outside the installation block, and one end of a linkage rod is fixedly connected with the exterior of the connecting wheel. The other end of the linkage rod is rotationally connected with a dustproof plate, sliding wheels are installed at the bottom of the dustproof plate, and the keyboard body is arranged in the hollow bin and protected through the dustproof plate. A servo motor is installed outside a hollow bin, a connecting wheel is controlled to rotate through the servo motor, a linkage rod is driven to rotate through the connecting wheel, and therefore a dustproof plate is driven to rotate, the dustproof plate can be controlled to move to the position of an end opening of the hollow bin, a keyboard body is protected, and indoor dust and impurities are prevented from falling onto the keyboard; therefore, the keyboard body can be normally used.

Description

Technical Field

[0001] The invention relates to the technical field of keyboards, and in particular to a sliding keyboard for teaching computer science and technology. Background Art

[0002] At present, many colleges and universities use multimedia classrooms to teach computer technology. Teaching is done through computers. Each computer is equipped with a computer keyboard. Teachers operate the keyboard to control the computer during teaching and display the teaching content on the display screen so that students can clearly see the teaching content.

[0003] The multimedia device will have a workbench, and the display and keyboard will be placed on the workbench, especially the keyboard. Since the keys on the keyboard are pressable, and the keyboard is exposed on the workbench without any protective equipment, in daily use, indoor dust and dust from cleaning the classroom will fall on the keyboard. When particulate impurities fall into the gap between the keys, it is easy to jam the key column, making the key difficult to press, thus affecting the use. Therefore, a sliding keyboard for computer science and technology teaching is proposed to solve the above problems. Summary of the invention

[0004] In order to make up for the above deficiencies, the present invention provides a sliding keyboard for teaching computer science and technology that overcomes the above technical problems or at least partially solves the above problems.

[0005] The present invention is achieved in that:

[0006] The present invention provides a sliding keyboard for teaching computer science and technology, comprising a hollow chamber, and a display is installed on the top of the hollow chamber;

[0007] A dustproof mechanism, the dustproof mechanism comprising:

[0008] A mounting block, the mounting block being mounted on a side wall inside the hollow bin, and a connecting wheel being rotatably mounted on the outside of the mounting block;

[0009] A connecting rod, one end of which is fixedly connected to the outside of the connecting wheel, and the other end of which is rotatably connected to the dustproof plate, a sliding wheel is installed at the bottom of the dustproof plate;

[0010] The keyboard body is arranged inside the hollow chamber and is protected by a dustproof plate.

[0011] In a preferred embodiment, a servo motor is fixedly mounted on the outer surface of the hollow bin, a rotating shaft is fixedly mounted on the output end of the servo motor, one end of the rotating shaft passes through the interior of the hollow bin and the mounting block, and one end of the rotating shaft is fixedly connected to the connecting wheel.

[0012] In a preferred solution, a movable slide plate is fixedly installed on the inner wall of the hollow warehouse, a slide rail is installed on the upper surface of the movable slide plate, the sliding wheel is slidably connected to the slide rail and is used to limit the dustproof plate, and connecting plates are respectively installed at both ends of the bottom of the dustproof plate, one of the connecting plates has a connecting block fixedly installed on the bottom, and the connecting rod is rotatably connected to the connecting block.

[0013] In a preferred embodiment, a sliding mechanism is installed inside the hollow bin, and the sliding mechanism includes a tooth plate, a placement plate and a rotating wheel. A round rod is rotatably installed inside the hollow bin, one end of the round rod is fixedly installed with a rotating wheel, and the other end is fixedly installed with a pushing wheel, and the pushing wheel is meshed and connected to the tooth plate.

[0014] In a preferred embodiment, a driving wheel is installed at the output end of the servo motor, the driving wheel is meshed and connected to the rotating wheel, and a tooth plate is slidably installed inside the hollow warehouse, and a placement plate is fixedly installed on the outer side of the tooth plate, and a groove is opened on the upper surface of the placement plate, and the keyboard body is placed inside the groove.

[0015] The inside of the groove is fixed with a plug rod, the outside of the plug rod is fixed with a base, the keyboard body is clamped on the base, the outer side of the base is fixed with a first magnetic block, and the inner wall of the groove is installed with a second magnetic block with opposite magnetic poles to the first magnetic block.

[0016] The interior of the hollow bin is also provided with a debris removal mechanism, which includes a hollow cylinder, a push rod and an air outlet pipe. The hollow cylinder is fixedly installed on the inner wall of the hollow bin, the push rod is slidably installed inside the hollow bin, and a piston can be fixedly installed at one end of the push rod. Similarly, the piston is also slidably installed inside the hollow cylinder.

[0017] There are two hollow cylinders, which are respectively arranged at the inner wall of one side of the hollow chamber. The outsides of the two hollow cylinders are fixedly connected to an air outlet pipe, and the outer surface of the air outlet pipe is provided with an air outlet hole corresponding to the position of the keyboard body.

[0018] An air inlet pipe is fixedly installed on the outer surface of the other side of the hollow cylinder. The air inlet pipe passes through the interior of the hollow bin and extends to the outside of the hollow bin. One-way valves are respectively installed on the air inlet pipe and the air outlet pipe.

[0019] The outer end of the push rod is rotatably mounted with a connecting rod, the connecting rod is arranged in two sections, the two sections are rotatably connected, one end of the connecting rod is rotatably connected to the outer surface of the tooth plate, and is used for sucking and exhausting air inside the hollow cylinder.

[0020] The present invention provides a sliding keyboard for teaching computer science and technology, and its beneficial effects include:

[0021] 1. By installing a servo motor on the outside of the hollow bin, the servo motor controls the rotation of the connecting wheel, which will drive the connecting rod to rotate through the connecting wheel, thereby driving the dustproof plate to rotate. The dustproof plate can be controlled to move to the position of the hollow bin port to protect the keyboard body and prevent indoor dust and impurities from falling onto the keyboard, thereby ensuring that the keyboard body can be used normally.

[0022] 2. By setting a movable tooth plate inside the hollow bin, the servo motor controls the rotation of the driving wheel, and the driving wheel drives the rotating wheel to rotate, the pushing wheel can be rotated, and the tooth plate can be pushed to move, so as to drive the placement plate to move. The keyboard body is placed on the placement plate, and the keyboard body will be moved while the placement plate is moved, which is convenient for removing or storing the keyboard body for use.

[0023] 3. A hollow cylinder is installed inside the hollow bin, an air outlet pipe is installed between the two hollow cylinders, an air outlet hole is provided on the air outlet pipe, and a connecting rod is installed at one end of the tooth plate. By pushing the connecting rod, the push rod can be controlled to move inside the hollow cylinder, and the gas inside the hollow cylinder is ejected and ejected from the air outlet, so as to blow away impurities on the keyboard body, avoid granular impurities from being stuck in the gap between the keys, and ensure the normal use of the keyboard body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those skilled in the art, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0026] Figure 2 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0027] Figure 3 It is a schematic diagram of the position of the servo motor of the present invention;

[0028] Figure 4 This is a schematic diagram of the inner structure of the dustproof plate of the present invention;

[0029] Figure 5 This is a schematic diagram of the internal structure of the hollow bin of the present invention;

[0030] Figure 6 It is a schematic diagram of the hollow cylinder structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the connection structure of two hollow cylinders of the present invention;

[0032] In the figure: 1. hollow bin; 2. display; 3. dust-proof mechanism; 31. mounting block; 311. connecting wheel; 32. linkage rod; 321. dust-proof plate; 322. sliding wheel; 33. keyboard body; 4. servo motor; 5. movable slide plate; 6. slide rail; 7. connecting plate; 8. connecting block; 9. sliding mechanism; 91. tooth plate; 92. placement plate; 93. rotating wheel; 10. round rod; 11. pushing wheel; 12. driving wheel; 13. groove; 14. plug-in rod; 15. base; 16. first magnetic block; 17. second magnetic block; 18. impurity removal mechanism; 181. hollow cylinder; 182. push rod; 183. air outlet pipe; 19. piston; 20. air outlet hole; 21. air inlet pipe; 22. connecting rod. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example

[0035] Reference Figure 1-Figure 7 The present invention provides a technical solution: a sliding keyboard for teaching computer science and technology, comprising a hollow bin 1 and a dustproof mechanism 3, and a display 2 is installed on the top of the hollow bin 1, the dustproof mechanism 3 comprises a mounting block 31, the mounting block 31 is installed at the position of the inner side wall of the hollow bin 1, the outer part of the mounting block 31 is rotatably mounted with a connecting wheel 311, one end of a connecting rod 32 is fixedly connected to the outer part of the connecting wheel 311, the other end of the connecting rod 32 is rotatably connected to a dustproof plate 321, a sliding wheel 322 is installed at the bottom of the dustproof plate 321, and a keyboard body 33 is arranged inside the hollow bin 1 and is protected by the dustproof plate 321.

[0036] In a preferred embodiment, a servo motor 4 is fixedly installed on the outer surface of the hollow bin 1, and a rotating shaft is fixedly installed on the output end of the servo motor 4. One end of the rotating shaft passes through the interior of the hollow bin 1 and the mounting block 31, and one end of the rotating shaft is fixedly connected to the connecting wheel 311. The device can automatically control the movement of the dustproof plate 321 to drive the keyboard body 33 to be moved out or stored to meet the needs of use. Therefore, a servo motor 4 is installed on the outside of the hollow bin 1. The servo motor 4 drives the connecting wheel 311 to rotate, and drives the dustproof plate 321 to rotate, so that the keyboard body 33 is protected by the dustproof plate 321 to prevent dust from falling.

[0037] In a preferred embodiment, a movable slide plate 5 is fixedly installed on the inner wall of the hollow warehouse 1, and a slide rail 6 is installed on the upper surface of the movable slide plate 5. The sliding wheel 322 is slidably connected to the slide rail 6 and is used to limit the dustproof plate 321. Connecting plates 7 are respectively installed at both ends of the bottom of the dustproof plate 321. A connecting block 8 is fixedly installed at the bottom of one of the connecting plates 7, and the connecting rod 32 is rotatably connected to the connecting block 8. In order to make the dustproof plate 321 move stably, a movable slide plate 5 is installed inside the hollow warehouse 1, and a slide rail 6 is installed on the movable slide plate 5, and the sliding wheel 322 is stably moved on the slide rail 6 so as to control the stable movement of the dustproof plate 321.

[0038] In a preferred embodiment, a sliding mechanism 9 is installed inside the hollow warehouse 1, and the sliding mechanism 9 includes a tooth plate 91, a placement plate 92 and a rotating wheel 93. A round rod 10 is rotatably installed inside the hollow warehouse 1, and the rotating wheel 93 is fixedly installed at one end of the round rod 10, and a pushing wheel 11 is fixedly installed at the other end. The pushing wheel 11 is meshed and connected to the tooth plate 91. A driving wheel 12 is rotatably installed at the output end of the servo motor 4, and the driving wheel 12 is meshed and connected to the rotating wheel 93. The tooth plate 91 is slidably installed inside the hollow warehouse 1, and the placement plate 92 is fixedly installed on the outer side surface of the tooth plate 91. A groove 13 is opened on the upper surface of the placement plate 92, and the keyboard body 33 is placed inside the groove 13.

[0039] In actual use, the driving wheel 12 is meshed with the rotating wheel 93 to drive the rotating wheel 93 to rotate, and the rotating wheel 93 drives the pushing wheel 11 to rotate. The pushing wheel 11 is meshed with the tooth plate 91 to control the movement of the tooth plate 91, thereby driving the placement plate 92 to move. Under the continuous movement of the tooth plate 91, it moves to the outside of the hollow bin 1, so as to move the placement plate 92 out of the interior of the hollow bin 1, and at the same time move the keyboard body 33 out of the interior of the hollow bin 1. After the keyboard body 33 is moved out of the interior of the hollow bin 1, it can be used.

[0040] The plug-in rod 14 is fixedly installed inside the groove 13, and the base 15 is fixedly installed outside the plug-in rod 14. The keyboard body 33 is clamped on the base 15. The first magnetic block 16 is fixedly installed on the outer side of the base 15, and a second magnetic block 17 with a magnetic pole opposite to the first magnetic block 16 is installed on the inner wall of the groove 13. A debris removal mechanism 18 is also installed inside the hollow bin 1. The debris removal mechanism 18 includes a hollow cylinder 181, a push rod 182 and an air outlet pipe 183. The hollow cylinder 181 is fixedly installed at the position of the inner wall of the hollow bin 1. The push rod 182 is slidably installed inside the hollow bin 1, and a piston 19 can be fixedly installed at one end of the push rod 182. Similarly, the piston 19 is also slidably installed inside the hollow cylinder 181. There are two 181s, which are respectively arranged on the inner wall of one side of the hollow bin 1. The outside of the two hollow cylinders 181 is fixedly connected to an air outlet pipe 183. The outer surface of the air outlet pipe 183 is provided with an air outlet hole 20 corresponding to the position of the keyboard body 33. The outer surface of the other side of the hollow cylinder 181 is fixedly installed with an air inlet pipe 21. The air inlet pipe 21 passes through the interior of the hollow bin 1 and extends to the outside of the hollow bin 1. Check valves are respectively installed on the air inlet pipe 21 and the air outlet pipe 183. The outer end of the push rod 182 is rotatably installed with a connecting rod 22. The connecting rod 22 is set to two sections, which are rotatably connected. One end of the connecting rod 22 is rotatably connected to the outer surface of the tooth plate 91, which is used to inhale and exhaust air inside the hollow cylinder 181.

[0041] In actual use, during the teaching process, the keyboard body 33 is located outside the hollow chamber 1. In this process, it is inevitable that impurities will fall onto the keyboard body 33. Each time the placement plate 92 is pulled out, the push rod 182 will be pulled out from the inside of the hollow cylinder 181, so that the outside air will be sucked into the position of the air intake pipe 21 into the inside of the hollow cylinder 181. After the teaching is completed, when the placement plate 92 moves back into the hollow chamber 1, the push rod 182 will be controlled to push into the inside of the hollow cylinder 181, and the gas inside the hollow cylinder 181 will be discharged from the inside of the air outlet pipe 183. At the same time, the gas will be ejected from the position of the air outlet 20. The placement plate 92 continues to move, which will control the continuous ejection of gas and spray the gas to the surface of the keyboard body 33 to blow away the impurities that fall between the keys and blow them onto the placement plate 92. When it is used next time, the impurities can be cleaned out from the placement plate 92 to meet the needs of use.

[0042] Specifically, the working process or working principle of a sliding keyboard for teaching computer science and technology is as follows: the multimedia device will have a workbench, and the display 2 and the keyboard will be placed on the workbench, especially the keyboard. Since the keys on the keyboard are pressable, and the keyboard is exposed on the workbench without any protective equipment, in daily use, indoor dust and dust from cleaning the classroom will fall on the keyboard. When granular impurities fall into the gap between the keys, it is easy to jam the key column, making the key difficult to press, thus affecting the use. Therefore, this device is designed to solve this problem.

[0043] Through this device, when the keyboard body 33 is not in use, the keyboard body 33 can be stored inside the hollow chamber 1, and the keyboard body 33 can be protected by the dustproof plate 321, so as to protect the keyboard body 33 and prevent indoor dust from falling onto the keyboard. At the same time, it also prevents particulate impurities from getting stuck in the position of the key gap, ensuring that the keyboard body 33 can be used normally. The specific operation is to stably install the hollow chamber 1 on an external workbench and connect the external power supply for the normal use of this device.

[0044] When the keyboard needs to be used, the servo motor 4 is controlled to work by pressing the external control switch. The servo motor 4 drives the rotating shaft to rotate, which will drive the connecting wheel 311 to rotate, thereby driving the connecting rod 32 to rotate, controlling the connecting rod 32 to rotate upward, and driving the dustproof plate 321 to rotate upward, and slowly moving the dustproof plate 321 from the position of the port of the hollow warehouse 1 into the interior of the hollow warehouse 1, and storing the dustproof plate 321 in the interior of the hollow warehouse 1. When the servo motor 4 is working, it will also drive the driving wheel 12 to rotate, and the driving wheel 12 is meshed and connected with the rotating wheel 93, which will drive the rotating wheel 93 to rotate, and then the rotating wheel 93 drives the pushing wheel 11 to rotate, and the pushing wheel 11 is meshed and connected with the toothed plate 91, so as to control the toothed plate 91 to move, thereby driving the placement plate 92 to move.

[0045] With the continuous movement of the tooth plate 91, it moves toward the outside of the hollow bin 1, so as to move the placement plate 92 out of the interior of the hollow bin 1, and at the same time move the keyboard body 33 out of the interior of the hollow bin 1. After the keyboard body 33 is moved out of the interior of the hollow bin 1, it can be used. During use, in order to meet the usage needs of each person, the position of the keyboard body 33 can be fine-tuned, the keyboard body 33 can be directly pulled to move, and the movement of the first magnetic block 16 can be controlled. The device sets the second magnetic block 17 to a plurality of pieces, so that the first magnetic block 16 can be attracted to the corresponding second magnetic block 17 according to the position of the keyboard body 33, so that the use position of the keyboard body 33 can be determined to meet the usage needs of different people.

[0046] After the teaching is completed, in order to prevent the keyboard body 33 from being exposed to the outside of the hollow bin 1 and covered with dust, the closing button can be pressed to control the servo motor 4 to reverse, so that the dustproof plate 321 stored in the hollow bin 1 is slowly moved out from the inside of the hollow bin 1 and gradually moved to the position of the port of the hollow bin 1. At the same time, the pushing wheel 11 will push the tooth plate 91 in the reverse direction, thereby driving the placement plate 92 to move back to the inside of the hollow bin 1, and move the keyboard body 33 back to the inside of the hollow bin 1, so as to protect the keyboard body 33 and avoid affecting the use of the keyboard.

[0047] During the teaching process, the keyboard body 33 is located outside the hollow chamber 1. During this process, it is inevitable that impurities will fall onto the keyboard body 33. Each time the placement plate 92 is pulled out, the push rod 182 will be pulled out from the inside of the hollow tube 181 to the outside, so that the outside air will be sucked into the inside of the hollow tube 181 through the air intake pipe 21. After the teaching is completed, when the placement plate 92 moves back into the hollow chamber 1, the push rod 182 will be controlled to push into the inside of the hollow tube 181, and the gas inside the hollow tube 181 will be discharged from the inside of the air outlet pipe 183. At the same time, the gas will be ejected from the position of the air outlet 20. The placement plate 92 continues to move, and the gas will be controlled to continue to eject, and the gas will be sprayed onto the surface of the keyboard body 33 to blow away the impurities that fall between the keys and blow them onto the placement plate 92. When it is used next time, the impurities can be cleaned out from the placement plate 92 to meet the needs of use.

[0048] It should be noted that the servo motor 4 is a device or equipment existing in the prior art, or a device or equipment that can be realized in the prior art. Its power supply, specific composition and principle are clear to those skilled in the art, so they are not described in detail.

Claims

1. A sliding keyboard for teaching computer science and technology, characterized in that: It comprises a hollow chamber (1), and a display (2) is installed on the top of the hollow chamber (1); A dustproof mechanism (3), the dustproof mechanism (3) comprising: A mounting block (31), the mounting block (31) being mounted on a side wall of the hollow bin (1), and a connecting wheel (311) being rotatably mounted on the outside of the mounting block (31); A connecting rod (32), one end of which is fixedly connected to the outside of the connecting wheel (311), and the other end of which is rotatably connected to a dustproof plate (321), and a sliding wheel (322) is installed at the bottom of the dustproof plate (321); A keyboard body (33), wherein the keyboard body (33) is arranged inside the hollow chamber (1) and is protected by a dustproof plate (321).

2. The sliding keyboard for teaching computer science and technology according to claim 1, characterized in that: A servo motor (4) is fixedly mounted on the outer surface of the hollow bin (1), a rotating shaft is fixedly mounted on the output end of the servo motor (4), one end of the rotating shaft passes through the interior of the hollow bin (1) and the mounting block (31), and one end of the rotating shaft is fixedly connected to the connecting wheel (311).

3. The sliding keyboard for teaching computer science and technology according to claim 2, characterized in that: A movable slide plate (5) is fixedly installed on the inner wall of the hollow warehouse (1), a slide rail (6) is installed on the upper surface of the movable slide plate (5), the sliding wheel (322) is slidably connected to the slide rail (6) and is used to limit the dustproof plate (321), and connecting plates (7) are respectively installed at both ends of the bottom of the dustproof plate (321), a connecting block (8) is fixedly installed at the bottom of one of the connecting plates (7), and the connecting rod (32) is rotatably connected to the connecting block (8).

4. The sliding keyboard for teaching computer science and technology according to claim 3, characterized in that: A sliding mechanism (9) is installed inside the hollow bin (1), and the sliding mechanism (9) comprises a tooth plate (91), a placement plate (92) and a rotating wheel (93). A round rod (10) is rotatably installed inside the hollow bin (1), and the rotating wheel (93) is fixedly installed at one end of the round rod (10), and a driving wheel (11) is fixedly installed at the other end, and the driving wheel (11) is meshedly connected to the tooth plate (91).

5. The sliding keyboard for teaching computer science and technology according to claim 4, characterized in that: A driving wheel (12) is rotatably mounted at the output end of the servo motor (4), the driving wheel (12) is meshedly connected to a rotating wheel (93), and a toothed plate (91) is slidably mounted inside the hollow chamber (1), and a placement plate (92) is fixedly mounted on the outer side of the toothed plate (91), a groove (13) is formed on the upper surface of the placement plate (92), and a keyboard body (33) is placed inside the groove (13).

6. The sliding keyboard for teaching computer science and technology according to claim 5, characterized in that: A plug-in rod (14) is fixedly mounted inside the groove (13), a base (15) is fixedly mounted outside the plug-in rod (14), the keyboard body (33) is snap-connected to the base (15), a first magnetic block (16) is fixedly mounted on the outer side surface of the base (15), and a second magnetic block (17) having a magnetic pole opposite to that of the first magnetic block (16) is mounted on the inner wall of the groove (13).

7. The sliding keyboard for teaching computer science and technology according to claim 6, characterized in that: The hollow bin (1) is also provided with a debris removal mechanism (18), which comprises a hollow cylinder (181), a push rod (182) and an air outlet pipe (183). The hollow cylinder (181) is fixedly installed on the inner wall of the hollow bin (1). The push rod (182) is slidably installed inside the hollow bin (1), and a piston (19) can be fixedly installed at one end of the push rod (182). Similarly, the piston (19) is also slidably installed inside the hollow cylinder (181).

8. The sliding keyboard for teaching computer science and technology according to claim 7, characterized in that: Two hollow cylinders (181) are provided and are respectively arranged at the inner wall of one side of the hollow chamber (1); the outsides of the two hollow cylinders (181) are fixedly connected to an air outlet pipe (183); and the outer surface of the air outlet pipe (183) is provided with an air outlet hole (20) corresponding to the position of the keyboard body (33).

9. The sliding keyboard for teaching computer science and technology according to claim 8, characterized in that: An air inlet pipe (21) is fixedly mounted on the outer surface of the other side of the hollow cylinder (181); the air inlet pipe (21) passes through the interior of the hollow bin (1) and extends to the outside of the hollow bin (1); and one-way valves are respectively mounted on the air inlet pipe (21) and the air outlet pipe (183).

10. The sliding keyboard for teaching computer science and technology according to claim 9, characterized in that: The outer end of the push rod (182) is rotatably mounted with a connecting rod (22), the connecting rod (22) being arranged in two sections, the two sections being rotatably connected, one end of the connecting rod (22) being rotatably connected to the outer surface of the tooth plate (91), for suctioning and exhausting air inside the hollow cylinder (181).

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