A stirring wheel for a stirring drill

Abstract

The present application relates to a mixing wheel for a mixing drill, belonging to the technical field of mixing equipment, which includes a toothed disc and a toothed plate, wherein the toothed plate is provided with a plurality of teeth and fixedly connected to the circumferential side wall of the toothed disc, each of the toothed plates is provided with a plurality of drill teeth along its length direction, and the side wall of the toothed plate is provided with a plurality of avoidance grooves, the avoidance grooves correspond to the drill teeth one by one, the drill teeth pass through the avoidance grooves, one end of the drill teeth is located in the toothed plate, and the other end of the drill teeth is located outside the toothed plate, the end of the drill teeth located in the toothed plate is rotatably connected to the toothed plate, and the rotation axis of the drill teeth and the toothed plate is parallel to the central axis of the toothed disc, and an adjustment component for driving the drill teeth to rotate is provided in the toothed plate. The present application has the effect of improving the convenience of the mixing work of the staff.

Description

Technical Field

[0001] The present application relates to the technical field of mixing equipment, and in particular to a mixing wheel for a mixing drill. Background Art

[0002] With the rapid development of my country's national economy and urban construction, high-rise buildings have sprung up in large and medium-sized cities, resulting in an increasing number of deep foundation pit projects. SMW piles are an important part of foundation pit work. SMW piles are formed by inserting H-shaped steel into cement mixing piles. The underground wall formed can also serve as a water-stop curtain and retaining structure. It has good economic efficiency and small environmental impact. Its mechanism of action is: by applying prestress to the anchor cable, anchor stress is provided to the SMW piles to reduce the displacement and internal force of the SMW piles, and control the deformation of the foundation pit within the allowable range. The SMW pile and anchor cable combined support system, while giving full play to their respective advantages, so as to achieve the purpose of green environmental protection, recyclable reuse, and no underground obstacles.

[0003] In the mixing process, a mixing drill is usually required for mixing. The existing mixing drill includes a mixing wheel, which includes a drill tooth plate, tooth pieces and drill teeth. A plurality of tooth pieces are provided and are fixed on the circumferential side wall of the tooth plate with the center of the tooth plate as the center. A plurality of drill teeth are provided and are fixedly connected along the side wall of the tooth piece, and a certain angle is formed between the drill teeth and the tooth piece.

[0004] With respect to the above-mentioned related technologies, the inventor believes that in the mixing work of the mixing drill, it is often necessary to mix different materials such as fine sand, gravel, clay, etc. When the mixing drill mixes different materials, in order to achieve a good mixing effect, different angles between the drill teeth and the tooth plates are required. For this reason, in the prior art, the mixing drill can only be replaced with different types of mixing wheels, which has the defect of making it inconvenient for the staff to operate. Summary of the invention

[0005] In order to improve the convenience of mixing work of workers, the present application provides a mixing wheel for a mixing drill.

[0006] The present application provides a stirring wheel for a stirring drill, which adopts the following technical solution:

[0007] A stirring wheel for a stirring drill comprises a toothed disc and a tooth plate, wherein the tooth plate is provided with a plurality of teeth and is fixedly connected to the circumferential side wall of the toothed disc, each of the tooth plates is provided with a plurality of drilling teeth along its length direction, and the side wall of the tooth plate is provided with a plurality of avoidance grooves, the avoidance grooves correspond to the drilling teeth one by one, the drilling teeth pass through the avoidance grooves, one end of the drilling teeth is located in the tooth plate, and the other end of the drilling teeth is located outside the tooth plate, the end of the drilling teeth located in the tooth plate is rotatably connected to the tooth plate, and the rotation axis of the drilling teeth and the tooth plate is parallel to the central axis of the toothed disc, and an adjustment component for driving the drilling teeth to rotate is provided in the tooth plate.

[0008] By adopting the above technical solution, when stirring different substances, the staff can directly adjust the angle of the drill teeth through the adjustment component without disassembling and replacing the stirring wheel, so that the angle of the drill teeth can be adjusted to an angle suitable for the current stirring material, thereby providing convenience for the staff's stirring work.

[0009] Optionally, the adjustment component includes a rack and a spur gear, and there are multiple spur gears and racks. The spur gears correspond to the drill teeth one by one, and the spur gears and the drill teeth are detachably connected. A sliding cavity is opened inside the tooth plate along its own length direction. The racks correspond to the tooth plates one by one, and the racks are located in the sliding cavity and move along the length direction of the tooth plate.

[0010] By adopting the above technical solution, the staff can slide the rack in the tooth piece, and the rack and the spur gear are engaged to rotate the spur gear, and the spur gear then drives the drill teeth to rotate, thereby realizing the adjustment of the drill teeth. At the same time, this structure can realize the simultaneous adjustment of the drill teeth on the same tooth piece, which not only provides convenience for the staff, but also enables the drill teeth on the same tooth piece to be adjusted at the same angle.

[0011] Optionally, a linkage assembly is provided between the toothed disk and the tooth pieces, and is used to drive all the racks to move simultaneously. The linkage assembly includes a first bevel gear, a second bevel gear, a screw and a threaded sleeve. The first bevel gear is located in the toothed disk and is rotatably connected to the toothed disk. The screw is fixedly connected to one end of the rack close to the first bevel gear, the threaded sleeve is threadedly connected to the screw, and the end of the threaded sleeve facing away from the rack is fixedly connected to the second bevel gear, and the second bevel gear is meshed with the first bevel gear.

[0012] By adopting the above technical solution, the staff rotates the first bevel gear to make the first bevel gear drive the second bevel gear to rotate, and the second bevel gear drives the threaded sleeve to rotate. Through the threaded connection between the threaded sleeve and the screw, the rack is moved in the sliding cavity.

[0013] Optionally, one end of the rack facing away from the screw rod is fixedly connected to a polished rod, a guide sleeve is provided on the outer sleeve of the polished rod, the polished rod and the guide sleeve are slidably connected along the length direction of the rack, and the guide sleeve is fixedly connected to the gear piece.

[0014] By adopting the above technical solution, the rack and the screw are guided and restricted by the sliding between the polished rod and the guide sleeve, thereby preventing the screw from rotating together with the threaded sleeve when the threaded sleeve rotates.

[0015] Optionally, a handwheel is fixedly connected to one side of the first bevel gear, and a fixing component for fixing the handwheel is provided between the handwheel and the gear plate.

[0016] By adopting the above technical solution, the staff can rotate the first bevel gear by turning the hand wheel. When the drill tooth angle is adjusted, the hand wheel is fixed by the fixing component to fix the first bevel gear, thereby fixing the angle of the drill tooth and finally fixing the drill tooth, thereby ensuring good stability of the drill tooth during the mixing process.

[0017] Optionally, the fixing assembly includes a cover plate and an elastic clamp, the elastic clamp is adapted to be clamped with the hand wheel, the elastic clamp is fixedly connected to the cover plate, and the cover plate and the toothed disc are detachably connected.

[0018] By adopting the above technical solution, after the drill teeth are adjusted to a suitable angle, the elastic clamp and the handwheel are clamped together, and then the handwheel is covered with a cover plate and the cover plate and the toothed disc are fixed, thereby achieving the fixation of the handwheel.

[0019] Optionally, the drill teeth include a drill bit and a drill rod, which are detachably connected. A connecting assembly for connecting to a spur gear is provided inside the drill rod. A fixing hole for inserting the drill rod is provided on the side wall of the spur gear, and a socket is provided on the inner wall of the spur gear at the fixing hole. The connecting assembly includes a push rod, a first connecting rod and a second connecting rod. The push rod slides along the length direction of the drill rod, the second connecting rod passes through the side wall of the drill rod and is plugged into the socket, and the first connecting rod is hinged between the push rod and the second connecting rod.

[0020] By adopting the above technical solution, when the drill bit is damaged, the drill bit and the drill rod can be separated and replaced. When the drill rod is damaged, the drill bit can be removed first, and the push rod can be slid outward, so that the push rod drives the first connecting rod to move, and the first connecting rod drives the second connecting rod to move, so that the second connecting rod is pulled out of the socket, and the drill rod and the spur gear can be separated and replaced.

[0021] Optionally, a spring is provided in the drill rod, and the spring is located at an end of the push rod away from the drill bit, one end of the spring is fixedly connected to the push rod, and the other end of the spring is fixedly connected to the drill rod.

[0022] By adopting the above technical solution, when the drill bit is removed, the spring releases its elastic force to automatically drive the push rod to move. When the drill bit and drill rod are installed, the drill bit drives the push rod to be completely retracted into the drill rod, compressing the spring, thereby providing convenience for the staff to replace the drill rod.

[0023] Optionally, the tooth plate is provided with a fan-shaped cover at the avoidance groove, a part of the fan-shaped cover is located outside the tooth plate, and the other part is located inside the tooth plate, and the fan-shaped cover is concentric with the spur gear, and a rotating shaft is fixedly connected to both sides of the fan-shaped cover, and the rotating shaft is rotatably connected to the tooth plate, and a through hole is opened on the side wall of the fan-shaped cover, and the drill rod passes through the through hole.

[0024] By adopting the above technical solution, the drill teeth can drive the fan-shaped cover to rotate together when rotating, and the fan-shaped cover can shield the avoidance groove to prevent materials from entering the tooth piece from the avoidance groove.

[0025] Optionally, a sealing gasket is fixedly provided on the tooth piece at the avoidance groove, and the sealing gasket is tightly fitted with the side wall of the fan-shaped cover.

[0026] By adopting the above technical solution, the sealing gasket increases the sealing effect of the fan-shaped cover on the avoidance groove, further effectively preventing the material from entering the tooth piece.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The angle of the drill teeth on each tooth piece can be adjusted by adjusting the components;

[0029] 2. The linkage assembly can realize the angle adjustment of all drill teeth at the same time;

[0030] 3. The connection and fixation of the drill teeth are achieved through the connecting assembly, which makes it convenient for the staff to replace the drill teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a stirring wheel for a stirring drill according to an embodiment of the present application;

[0032] Figure 2 It is an exploded schematic diagram of a stirring wheel for a stirring drill according to an embodiment of the present application;

[0033] Figure 3 This is a partial cross-sectional view of the internal structure of the toothed disc and the toothed plate in the embodiment of the present application;

[0034] Figure 4 This is a partial cross-sectional view showing the internal structure of the drill tooth in the embodiment of the present application;

[0035] Figure 5 yes Figure 4 A partial enlarged schematic diagram of part A.

[0036] In the figure, 1, toothed disc; 2, tooth piece; 21, avoidance groove; 211, sealing gasket; 22, sliding cavity; 3, drill teeth; 31, drill bit; 32, drill rod; 4, adjustment assembly; 41, rack; 42, spur gear; 421, fixing hole; 422, socket; 43, bare rod; 44, guide sleeve; 5, linkage assembly; 51, first bevel gear; 52, second bevel gear; 53, screw; 54, threaded sleeve; 6, hand wheel; 61, hand lever; 7, fixing assembly; 71, cover plate; 72, elastic clamp; 8, connecting assembly; 81, push rod; 82, first connecting rod; 83, second connecting rod; 84, spring; 9, fan-shaped cover; 91, rotating shaft; 92, through hole. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-5 This application is described in further detail.

[0038] The embodiment of the present application discloses a stirring wheel for a stirring drill.

[0039] refer to Figure 1 A mixing wheel for a mixing drill comprises a toothed disc 1, tooth pieces 2 and drill teeth 3. In the embodiment of the present application, the cross section of the toothed disc 1 is a circular structure; the tooth pieces 2 are long strip structures and are provided in three numbers, and the three tooth pieces 2 are fixedly arranged on the circumferential side wall of the toothed disc 1 in a uniform manner around the toothed disc 1; and three drill teeth 3 are provided on each tooth piece 2, and the drill teeth 3 on each tooth piece 2 are evenly spaced.

[0040] Reference Figure 2 and Figure 3 The side wall of the tooth plate 2 is provided with a plurality of avoidance grooves 21, and the avoidance grooves 21 correspond to the drill teeth 3 one by one. One end of the drill tooth 3 is located outside the tooth plate 2, and the other end of the drill tooth 3 extends from the avoidance groove 21 into the tooth plate 2 and is rotatably connected with the tooth plate 2. The rotation axis of the drill tooth 3 is parallel to the central axis of the toothed disc 1. The tooth plate 2 is provided with a sliding cavity 22 along its length direction, and an adjustment component 4 for adjusting the angle of the drill tooth 3 is arranged in the sliding cavity 22. When the material stirred by the mixing drill changes, in order to achieve a good stirring effect, the angle of the drill tooth 3 needs to be adjusted, and the staff can drive the drill tooth 3 to rotate through the adjustment component 4.

[0041] The adjustment assembly 4 includes a rack 41, a spur gear 42, a polished rod 43 and a guide sleeve 44. There are multiple spur gears 42 and they correspond to the drill teeth 3 one by one. A connecting assembly 8 for connecting and fixing the drill teeth 3 and the spur gear 42 is provided in the drill teeth 3; there are multiple racks 41 and they correspond to the tooth pieces 2 one by one. The racks 41 slide along the length direction of the tooth pieces 2 in the sliding cavity 22; the end of the rack 41 away from the toothed disc 1 is fixedly connected to the polished rod 43, and the guide sleeve 44 is sleeved on the polished rod 43, and the two are slidably connected. The guide sleeve 44 is fixedly connected to the inner wall of the tooth piece 2 at the sliding cavity 22. When the staff needs to adjust the angle of the drill teeth 3, the rack 41 is slid in the sliding cavity 22, and the rack 41 drives the spur gear 42 to rotate, and the spur gear 42 drives the drill teeth 3 to rotate, so that the angle of the drill teeth 3 can be adjusted.

[0042] A linkage assembly 5 is provided between the toothed disc 1 and the toothed piece 2 for driving all the racks 41 to move simultaneously. The linkage assembly 5 includes a first bevel gear 51, a second bevel gear 52, a screw 53 and a threaded sleeve 54. The first bevel gear 51 is located in the toothed disc 1 and the rotation center of the first bevel gear 51 is colinear with the center of the toothed disc 1. A plurality of second bevel gears 52 are provided, and the second bevel gears 52 correspond to the racks 41 one by one. The screw 53 is fixedly connected to one end of the rack 41 away from the light rod 43. The threaded sleeve 54 is fixedly connected to the second bevel gear 52 and is threadedly connected to the screw 53. A handwheel 6 is provided in the toothed disc 1. The handwheel 6 is fixedly connected to the first bevel gear 51. The end of the toothed disc 1 close to the handwheel 6 penetrates into the interior of the toothed disc 1. A fixing assembly 7 for fixing the handwheel 6 is provided on the side of the toothed disc 1 close to the handwheel 6.

[0043] The handwheel 6 includes multiple hand rods 61, and the fixing assembly 7 includes a cover plate 71 and an elastic clamp 72. There are multiple elastic clamps 72, and the elastic clamps 72 can be snap-fitted with the hand rods 61. The elastic clamps 72 are fixedly connected to the cover plate 71 toward the side of the handwheel 6, and the cover plate 71 is fixedly connected to the gear disc 1 by bolts.

[0044] The staff rotates the hand wheel 6 to drive the first bevel gear 51 to rotate, the first bevel gear 51 drives the second bevel gear 52 to rotate, and the second bevel gear 52 drives the threaded sleeve 54 to rotate, and the rack 41 moves along the sliding cavity 22 through the threaded connection between the threaded sleeve 54 and the screw rod 53; when the staff adjusts the drill tooth 3 to a suitable angle, the elastic clamp 72 is engaged with the hand rod 61, and then the cover plate 71 is bolted to the toothed disc 1, thereby ensuring that the drill tooth 3 has good stability.

[0045] Reference Figure 4 and Figure 5The connecting assembly 8 includes a push rod 81, a first connecting rod 82, a second connecting rod 83 and a spring 84; the drill tooth 3 includes a drill bit 31 and a drill rod 32, the end of the drill bit 31 away from the drill rod 32 is in a cone shape, and the drill bit 31 and the drill rod 32 are threadedly connected. The side wall of the spur gear 42 is provided with a fixing hole 421 for inserting the drill rod 32, and the spur gear 42 is provided with insertion holes 422 on both sides of the fixing hole 421. The push rod 81 slides in the drill rod 32 along the length direction of the drill rod 32. Two second connecting rods 83 are provided. The two second connecting rods 83 are located on both sides of the push rod 81 and slide in the direction toward the insertion hole 422. The second connecting rod 83 passes through the drill rod 32 and is plugged and adapted to the insertion hole 422. Two first connecting rods 82 are provided. The two first connecting rods 82 are located on both sides of the push rod 81, and the first connecting rod 82 is hinged between the push rod 81 and the second connecting rod 83. The spring 84 is located at one end of the push rod 81 away from the drill bit 31. The two ends of the spring 84 are fixedly connected to the push rod 81 and the drill rod 32 respectively. The end of the push rod 81 facing away from the spring 84 abuts against the drill bit 31. When the drill bit 31 is connected to the drill rod 32, the spring 84 is in a compressed state.

[0046] When the staff needs to replace the drill bit 31 or the drill rod 32, the drill bit 31 is rotated and removed, the spring 84 releases the elastic force to drive the push rod 81 to move, and the push rod 81 drives the second connecting rod 83 to be pulled out from the socket 422 through the first connecting rod 82, and then the staff can remove the drill rod 32 from the fixing hole 421 and replace it; when the replacement is completed, the drill rod 32 is inserted into the fixing hole 421 again, and then the drill bit 31 is installed, the drill bit 31 drives the push rod 81 to move toward the spring 84, and the push rod 81 drives the second connecting rod 83 to be inserted into the socket 422 through the first connecting rod 82, thereby realizing the connection and fixation of the drill rod 32 and the spur gear 42.

[0047] Reference Figure 3 and Figure 4 The tooth piece 2 is provided with a fan-shaped cover 9 at the avoidance groove 21, a part of the fan-shaped cover 9 is located inside the tooth piece 2, and the other part is located outside the tooth piece 2, and the fan-shaped cover 9 is concentric with the spur gear 42. A rotating shaft 91 is fixedly provided at the center of both sides of the fan-shaped cover 9, and the rotating shaft 91 is rotatably connected to the tooth piece 2. A through hole 92 is opened on the side wall of the fan-shaped cover 9, and the drill rod 32 passes through the through hole 92. A sealing gasket 211 is fixedly provided on the circumferential inner wall of the tooth piece 2 at the avoidance groove 21, and the sealing gasket 211 is tightly fitted with the side wall of the fan-shaped cover 9.

[0048] The implementation principle of the stirring wheel for a stirring drill in the embodiment of the present application is as follows: when the staff needs to change the angle of the drill teeth 3, they only need to remove the cover plate 71 and turn the hand wheel 6, which drives the first bevel gear 51 to rotate, and the first bevel gear 51 drives the threaded sleeve 54 to rotate through the meshing with the second bevel gear 52, and the rotating sleeve then drives the rack 41 to move along the sliding cavity 22 through the threaded connection with the screw 53, and the rack 41 drives the spur gear 42 to rotate when it moves, thereby achieving the adjustment of the angle of the drill teeth 3. Through the above structure, the angle of the drill teeth 3 can be changed without the workers changing the stirring wheel, thereby providing convenience for the staff's stirring work.

[0049] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A stirring wheel for a stirring drill, comprising a toothed disc (1) and toothed plates (2), wherein the toothed plates (2) are provided with a plurality of teeth and are fixedly connected to the circumferential side wall of the toothed disc (1), characterized in that: Each of the tooth plates (2) is provided with a plurality of drill teeth (3) along its length direction, and a plurality of avoidance grooves (21) are provided on the side walls of the tooth plates (2). The avoidance grooves (21) correspond to the drill teeth (3) one by one, and the drill teeth (3) pass through the avoidance grooves (21). One end of the drill tooth (3) is located inside the tooth plate (2), and the other end of the drill tooth (3) is located outside the tooth plate (2). The end of the drill tooth (3) located inside the tooth plate (2) is rotatably connected to the tooth plate (2), and the rotation axis of the drill tooth (3) and the tooth plate (2) is parallel to the central axis of the toothed disc (1). An adjustment component (4) for driving the drill teeth (3) to rotate is provided inside the tooth plate (2). When different substances are stirred, the angle of the drill teeth is directly adjusted through the adjustment component.

2. A stirring wheel for a stirring drill according to claim 1, characterized in that: The adjustment assembly (4) comprises a rack (41) and a spur gear (42), a plurality of spur gears (42) and a plurality of racks (41), the spur gears (42) and the drill teeth (3) corresponding one to one, and the spur gears (42) and the drill teeth (3) are detachably connected, a sliding cavity (22) is provided inside the tooth plate (2) along its length direction, the racks (41) and the tooth plates (2) correspond one to one, and the racks (41) are located in the sliding cavity (22) and move along the length direction of the tooth plate (2).

3. A stirring wheel for a stirring drill according to claim 2, characterized in that: A linkage assembly (5) for driving all the racks (41) to move simultaneously is provided between the toothed disc (1) and the toothed piece (2). The linkage assembly (5) comprises a first bevel gear (51), a second bevel gear (52), a screw (53) and a threaded sleeve (54). The first bevel gear (51) is located in the toothed disc (1) and is rotationally connected to the toothed disc (1). The screw (53) is fixedly connected to one end of the rack (41) close to the first bevel gear (51). The threaded sleeve (54) is threadedly connected to the screw (53). One end of the threaded sleeve (54) facing away from the rack (41) is fixedly connected to the second bevel gear (52). The second bevel gear (52) is meshed with the first bevel gear (51).

4. The stirring wheel for a stirring drill according to claim 3, characterized in that: The end of the rack (41) away from the screw rod (53) is fixedly connected with a light rod (43), and a guide sleeve (44) is provided on the outer shell of the light rod (43). The light rod (43) and the guide sleeve (44) are slidably connected along the length direction of the rack (41), and the guide sleeve (44) is fixedly connected to the tooth piece (2).

5. The stirring wheel for a stirring drill according to claim 3, characterized in that: A hand wheel (6) is fixedly connected to one side of the first bevel gear (51), and a fixing component (7) for fixing the hand wheel (6) is provided between the hand wheel (6) and the toothed disc (1).

6. The stirring wheel for a stirring drill according to claim 5, characterized in that: The fixing assembly (7) comprises a cover plate (71) and an elastic clamp (72), wherein the elastic clamp (72) is clamped and adapted to the hand wheel (6), the elastic clamp (72) is fixedly connected to the cover plate (71), and the cover plate (71) and the toothed disc (1) are detachably connected.

7. The stirring wheel for a stirring drill according to claim 2, characterized in that: The drill teeth (3) include a drill bit (31) and a drill rod (32), the drill bit (31) and the drill rod (32) are detachably connected, a connecting assembly (8) for connecting with a spur gear (42) is arranged in the drill rod (32), a fixing hole (421) for inserting the drill rod (32) is provided on the side wall of the spur gear (42), an insertion hole (422) is provided on the inner wall of the spur gear (42) at the fixing hole (421), the connecting assembly (8) includes a push rod (81), a first connecting rod (82) and a second connecting rod (83), the push rod (81) slides along the length direction of the drill rod (32), the second connecting rod (83) slides in a direction toward the insertion hole (422), the second connecting rod (83) penetrates the side wall of the drill rod (32) and is plugged and matched with the insertion hole (422), and the first connecting rod (82) is hinged between the push rod (81) and the second connecting rod (83).

8. The stirring wheel for a stirring drill according to claim 7, characterized in that: A spring (84) is arranged in the drill rod (32). The spring (84) is located at an end of the push rod (81) away from the drill bit (31). One end of the spring (84) is fixedly connected to the push rod (81), and the other end of the spring (84) is fixedly connected to the drill rod (32).

9. The stirring wheel for a stirring drill according to claim 2, characterized in that: The tooth piece (2) is provided with a fan-shaped cover (9) at the avoidance groove (21), a part of the fan-shaped cover (9) is located outside the tooth piece (2), and the other part is located inside the tooth piece (2), and the fan-shaped cover (9) is concentric with the spur gear (42), and a rotating shaft (91) is fixedly connected to both sides of the fan-shaped cover (9), and the rotating shaft (91) is rotatably connected to the tooth piece (2), and a through hole (92) is opened on the side wall of the fan-shaped cover (9), and the drill rod (32) passes through the through hole (92).

10. The stirring wheel for a stirring drill according to claim 9, characterized in that: The tooth piece (2) is fixedly provided with a sealing gasket (211) at the avoidance groove (21), and the sealing gasket (211) is tightly fitted with the side wall of the sector cover (9).

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