Servo swing arm feeding and discharging device on numerical control machining equipment

Abstract

The servo swing arm feeding and discharging device on the numerical control machining equipment comprises a rectangular machine base, a turning machine head is fixedly connected to the lower portion of the machine base in an inserted mode, and a clamping chuck is arranged on the turning machine head; a feeding bin and a discharging bin are formed on the machine base on the upper side of the turning machine head, vertical feeding and discharging lifting machines are arranged in the feeding bin and the discharging bin respectively, a partition plate is fixedly inserted into the machine base on the right side of the feeding and discharging lifting machines, a window communicated with the feeding bin and the discharging bin is formed in the upper portion of the partition plate, and a clamping swing arm is inserted into the partition plate on the lower side of the window. The clamping swing arm comprises a transverse rotary feeding shaft, the right end of the rotary feeding shaft extends out of the partition plate to be fixedly connected with a rotary arm, the upper end of the rotary arm is fixedly connected with a connecting base, the connecting base is fixedly connected with a longitudinal connecting plate, and the front end and the rear end of the connecting plate are fixedly connected with two sets of mechanical claws right opposite to the feeding bin and the discharging bin respectively. The device can replace manual work to achieve feeding and discharging of numerical control machining equipment; and compared with a robot, the structure is simple, and the cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of loading and unloading devices of numerically controlled machine tools, and more specifically to a servo swing arm loading and unloading device on numerically controlled processing equipment. Background Art

[0002] At present, CNC machine tools are widely used for machining bearing rings, but manual operation is still commonly used in the loading and unloading process of the rings clamped on the chuck in the CNC machine tools. However, there are many disadvantages in manual loading and unloading, such as the following: 1. The efficiency of manual loading and unloading is not high, and thus the processing effect cannot be improved, and the output is limited by personnel; 2. The manual loading and unloading process is a repetitive operation in a short period of time, and the labor intensity of personnel is high; 3. When manually clamping or removing the rings on the chuck, the chuck needs to be completely stopped. There are great safety hazards in clamping before the chuck is completely stopped. Therefore, some CNC machine tools are equipped with robots to replace manual loading and unloading of the rings, but the robot has a complex structure and high cost, and the robot is generally set on the outside of the CNC machine tool, which will take up a large space; Therefore, it is necessary to design a loading and unloading device that can replace manual operation and has a much lower cost than the robot. Summary of the invention

[0003] The purpose of the present invention is to address the deficiencies of the prior art and to provide a servo swing arm loading and unloading device on CNC machining equipment, which can replace manual loading and unloading of CNC machining equipment; and compared with robots, it has a simple structure and low cost.

[0004] The servo swing arm loading and unloading device on the CNC machining equipment includes a rectangular machine base, a turning machine head is plugged and fixed at the lower part of the machine base, and a clamping chuck is provided on the right end face of the turning machine head; two feeding bins and discharging bins distributed front and back are formed on the machine base on the upper side of the turning machine head, and vertical feeding and discharging elevators are respectively provided in the feeding bin and the discharging bin, and a longitudinal partition is plugged and fixed in the machine base on the right side of the feeding and discharging elevator, and a window connected to the feeding bin and the discharging bin is formed on the upper part of the partition, and a clamping swing arm is inserted on the partition on the lower side of the window, and the clamping swing arm includes a horizontal rotating feed shaft, and the right end of the rotating feed shaft extends out of the partition and is fixedly connected to a curved tubular rotating arm, and the upper end of the rotating arm is fixedly connected to a connecting seat, and the upper end face of the connecting seat is fixedly connected to a longitudinal connecting plate, and the front and rear ends of the connecting plate are respectively fixedly connected to two groups of mechanical claws facing the feeding bin and the discharging bin; The rotating feed shaft comprises a tubular feed shaft and a guide sleeve, the feed shaft is inserted on the guide sleeve, and the guide sleeve is fixedly connected to the top of the turning machine head; a spline sleeve is inserted and fixed in the feed shaft, a spline shaft is inserted in the spline sleeve, the left end of the spline shaft extends out of the feed shaft and is fixedly connected to the shaft of the servo motor through a coupling; a transverse limit groove is formed on the side wall of the guide sleeve, a feed seat is inserted in the limit groove, the feed seat is pivotally connected to the feed shaft, one end of the feed seat extends out of the guide sleeve and is inserted and fixed with a ball nut, a transverse ball screw is threaded in the ball nut, one end of the ball screw is connected to an end seat through a bearing, the end seat is fixedly connected to the guide sleeve, the other end of the ball screw is fixedly connected to the shaft of the feed motor through a coupling, the feed motor is fixed on the motor bracket, and the motor bracket and the servo motor are both fixedly connected to the top of the turning machine head.

[0005] Preferably, a plurality of groups of elevator mounting brackets are fixedly connected to the top of the machine base, and the upper end of the conveyor belt in the inlet and outlet elevator is arranged between the elevator mounting brackets; The conveying direction of the in-and-out material elevator in the feed bin is opposite to the conveying direction of the in-and-out material elevator in the discharge bin.

[0006] Preferably, a baffle assembly for shielding the window is provided on the machine base, and the baffle assembly includes a plurality of vertical lifting cylinders fixedly connected to the top of the machine base, and the lower end of the piston rod of the lifting cylinder is fixedly connected to the baffle, and the baffle rests on the right end surface of the partition.

[0007] Preferably, the mechanical claw comprises a three-claw finger cylinder fixedly connected to the connecting plate and arranged in a horizontal direction, and an elastic material stripping frame is provided between the claws of the three-claw finger cylinder; The elastic material unloading rack includes a T-shaped positioning column which is inserted and fixed in the middle of the three-claw finger cylinder body, and a fan-shaped pushing plate is inserted on the positioning column. The pushing plate includes a circular hub, and three groups of fan-shaped branch plates are formed on the outer wall of the hub. The outer end of the branch plate is inserted and fixed with a transverse guide rod; the outer ring of the three-claw finger cylinder body is formed with a plurality of transverse step holes, and the right end of the guide rod is respectively inserted in the step hole of the three-claw finger cylinder body, and a spring is inserted on the guide rod, and the left end of the spring abuts on the branch plate and the right end abuts on the step surface of the step hole.

[0008] Preferably, the center distances from the two groups of three-jaw finger cylinders on the clamping swing arm to the rotary feed axis are equal, and the center distance from the three-jaw finger cylinder to the rotary feed axis is equal to the center distance from the clamping chuck on the turning machine head to the rotary feed axis.

[0009] Preferably, the branch plates on the push plate are evenly distributed in a ring shape around the central axis of the three-claw finger cylinder, and the diameter of the outer ring of the branch plate is larger than the diameter of the three-claw finger cylinder body.

[0010] Preferably, a fan-shaped boss extending to the left is formed on the left end surface of the branch plate close to the hub; The right end of the positioning column extends out of the three-claw finger cylinder body and is fixedly connected to the air pipe through the connecting plate. A central hole connected to the air pipe is formed on the positioning column. An air outlet connected to the central hole is formed on the positioning column between the push plate and the three-claw finger cylinder body. A circular convex ring is formed on the right end face of the hub, and the convex ring is inserted into the positioning column. An annular ventilation groove opposite to the air outlet is formed on the inner wall of the convex ring; an oblique blowing groove connected to the annular ventilation groove is formed on the outer wall of the fan-shaped boss, and the blowing groove is fan-shaped.

[0011] The beneficial effects of the present invention are: The device can replace manual labor to load and unload materials on CNC processing equipment; and compared with robots, it has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 A partial cross-sectional schematic diagram of the present invention in the front view direction; Figure 3 It is a schematic diagram of the three-dimensional structure of the internal rotating feed shaft of the present invention; Figure 4 It is a front view structural schematic diagram of the internal rotating feed shaft of the present invention; Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure at AA in the middle; Figure 6 It is a schematic diagram of the three-dimensional structure of the mechanical claw in the present invention; Figure 7 It is a partial cross-sectional schematic diagram of the mechanical claw in the present invention from the front view; In the figure: 1. Machine base; 11. Feed bin; 12. Discharge bin; 2. Turning head; 21. Clamping chuck; 3. Clamping swing arm; 31. Rotary feed shaft; 32. Rotating arm; 33. Connecting seat; 34. Connecting plate; 35. Mechanical claw; 4. Partition; 41. Window; 5. Feed and discharge elevator; 6. Elevator mounting bracket; 7. Baffle assembly; 71. Baffle; 72. Lifting cylinder. DETAILED DESCRIPTION

[0013] Example: See Figures 1 to 7As shown, the servo swing arm loading and unloading device on the CNC machining equipment includes a rectangular machine base 1, a turning head 2 is plugged and fixed at the lower part of the machine base 1, and a clamping chuck 21 is provided on the right end face of the turning head 2; two front and rear distributed feed bins 11 and discharge bins 12 are formed on the machine base 1 on the upper side of the turning head 2, and vertical feed and discharge elevators 5 are respectively provided in the feed bin 11 and the discharge bin 12, and a longitudinal partition 4 is plugged and fixed in the machine base 1 on the right side of the feed and discharge elevator 5, and the upper part of the partition 4 is formed There is a window 41 connected with the feed bin 11 and the discharge bin 12, and a clamping swing arm 3 is inserted on the partition 4 at the lower side of the window 41. The clamping swing arm 3 includes a transverse rotating feed shaft 31. The right end of the rotating feed shaft 31 extends out of the partition 4 and is fixedly connected to a curved tubular rotating arm 32. The upper end of the rotating arm 32 is fixedly connected to a connecting seat 33. The upper end surface of the connecting seat 33 is fixedly connected to a longitudinal connecting plate 34. The front and rear ends of the connecting plate 34 are respectively fixedly connected to two groups of mechanical claws 35 facing the feed bin 11 and the discharge bin 12. The rotating feed shaft 31 comprises a tubular feed shaft 311 and a guide sleeve 312. The feed shaft 311 is inserted into the guide sleeve 312, and the guide sleeve 312 is fixed to the top of the turning machine head 2. A spline sleeve 313 is inserted and fixed in the feed shaft 311, and a spline shaft 314 is inserted in the spline sleeve 313. The left end of the spline shaft 314 extends out of the feed shaft 311 and is fixedly connected to the shaft of the servo motor 315 through a coupling. A transverse limiting groove 3121 is formed on the side wall of the guide sleeve 312, and a feed seat 31 is inserted in the limiting groove 3121. 6. The feed seat 316 is pivoted on the feed shaft 311, one end of the feed seat 316 extends out of the guide sleeve 312 and is fixed with a ball nut 317, a transverse ball screw 318 is threaded inside the ball nut 317, one end of the ball screw 318 is connected to an end seat 319 through a bearing, the end seat 319 is fixed to the guide sleeve 312, the other end of the ball screw 318 is fixed to the shaft of the feed motor 310 through a coupling, the feed motor 310 is fixed to the motor bracket 320, the motor bracket 320 and the servo motor 315 are both fixed to the top of the turning head 2.

[0014] A plurality of groups of elevator mounting brackets 6 are fixedly connected to the top of the machine base 1 , and the upper end of the conveyor belt in the inlet and outlet elevator 5 is arranged between the elevator mounting brackets 6 .

[0015] The conveying direction of the in-and-out elevator 5 in the feed bin 11 is opposite to that of the in-and-out elevator 5 in the discharge bin 12, wherein the in-and-out elevator 5 in the feed bin 11 transports the rings from bottom to top, and the in-and-out elevator 5 in the discharge bin 12 transports the rings from top to bottom.

[0016] The base 1 is provided with a baffle assembly 7 for blocking the window 41. The baffle assembly 7 includes a plurality of lifting cylinders 72 fixedly connected to the top of the base 1 and in a vertical direction. The lower end of the piston rod of the lifting cylinder 72 is fixedly connected to a baffle 71. The baffle 71 abuts against the right end surface of the partition 4. When the mechanical claw 35 grabs the ring from the feed bin 11 or puts the ring into the discharge bin 12, the lifting cylinder 72 drives the baffle 71 to move up, so as to achieve blocking by the baffle 71, thereby preventing the ring on the conveyor belt of the feed and discharge elevator 5 from falling from the window 41 during operation.

[0017] The mechanical claw 35 includes a three-claw finger cylinder 351 fixedly connected to the connecting plate 34 and arranged in a horizontal direction, and an elastic material stripping frame is provided between the fingers of the three-claw finger cylinder 351; when the three-claw finger cylinder 351 clamps the ferrule, it can clamp the ferrule on its outer wall, but when the ferrule is separated from the three-claw finger cylinder 351, the elastic material stripping frame needs to be used to push the ferrule from the fingers of the three-claw finger cylinder 351; The elastic material unloading rack includes a T-shaped positioning column 353 which is inserted and fixed in the middle of the cylinder body of the three-claw finger cylinder 351. A fan-shaped push plate 352 is inserted and sleeved on the positioning column 353. The push plate 352 includes a circular hub 3521. Three sets of fan-shaped branch plates 3522 are formed on the outer wall of the hub 3521. The outer end of the branch plate 3522 is inserted and fixed with a transverse guide rod 354; the outer ring of the cylinder body of the three-claw finger cylinder 351 is formed with a plurality of transverse step holes 3511. The right end of the guide rod 354 is divided into a plurality of transverse step holes 3511 and a plurality of step holes 3512. It is inserted into the step hole 3511 of the cylinder body of the three-claw finger cylinder 351. A spring 355 is inserted on the guide rod 354. The left end of the spring 355 abuts on the branch plate 3522, and the right end abuts on the step surface of the step hole 3511. The above is the specific structure of the elastic material unloading rack. When the ring is clamped, the ring will drive the push plate 352 to move right, causing the spring 355 to compress. When discharging, the claws of the three-claw finger cylinder 351 release the ring, and the reset of the spring 355 will cause the ring to separate from the three-claw finger cylinder 351.

[0018] The two groups of three-jaw finger cylinders 351 on the clamping swing arm 3 have equal center distances to the rotating feed shaft 31, and the center distance between the three-jaw finger cylinder 351 and the rotating feed shaft 31 is equal to the center distance between the clamping chuck 21 on the turning head 2 and the rotating feed shaft 31. Because one group of three-jaw finger cylinders 351 is used to load the ring onto the clamping chuck 21, and the other group of three-jaw finger cylinders 351 is used to clamp the ring onto the clamping chuck 21, the distance needs to be consistent.

[0019] The feed seat 316 includes a circular ring 3161 and an ear seat 3162, and the ball nut 317 is inserted and fixed on the ear seat 3162; an annular groove 3111 is formed on the outer wall of the left end of the feed shaft 311, and the ring 3161 is inserted and sleeved on the feed shaft 311 at the annular groove 3111, and a limiting sleeve 330 is inserted and fixed on the annular groove 3111 of the feed shaft 311, and the two end faces of the ring 3161 respectively abut against the side wall of the annular groove 3111 and the end face of the limiting sleeve 330.

[0020] The branch plates 3522 on the push plate 352 are evenly distributed in a ring shape around the central axis of the three-claw finger cylinder 351 , and the diameter of the outer ring of the branch plates 3522 is greater than the diameter of the cylinder body of the three-claw finger cylinder 351 .

[0021] A fan-shaped boss 3523 extending to the left is formed on the left end surface of the branch plate 3522 close to the hub 3521; The right end of the positioning column 353 extends out of the cylinder body of the three-claw finger cylinder 351 and passes through the connecting plate 34 to be fixedly connected with the air pipe. The positioning column 353 is formed with a central hole 3531 connected with the air pipe. The positioning column 353 between the push plate 352 and the cylinder body of the three-claw finger cylinder 351 is formed with an air outlet hole 3532 connected with the central hole 3531. A circular convex ring 3524 is formed on the right end surface of the hub 3521, and the convex ring 3524 is inserted on the positioning column 353. An annular ventilation groove 3525 opposite to the air outlet 3532 is formed on the inner wall of the convex ring 3524; an oblique blowing groove 3526 connected to the annular ventilation groove 3525 is formed on the outer wall of the fan-shaped boss 3523, and the blowing groove 3526 is fan-shaped; When the inner ring of the ferrule is turned, when the manipulator 35 clamps the ferrule, although the push plate 352 is against the right end face of the ferrule, the fan-shaped boss 3523 on the push plate 352 can enter the inner side of the ferrule, and at the same time, the ferrule clamp will cause the push plate 352 to move right, so that the annular ventilation groove 3525 and the air outlet 3532 are connected, so that the positioning column 353 enters the annular ventilation groove 3525 and is blown out through the fan-shaped blowing groove 3526, so the blown air flow is annular and blown obliquely to the inner wall of the ferrule, blowing away the chips and chip liquid remaining on the inner wall of the ferrule, thereby cleaning the ferrule.

[0022] Working principle: This solution is a servo swing arm loading and unloading device on CNC processing equipment. This device uses a servo swing arm set in the CNC processing equipment to load and unload the ring; the specific operation method is as follows: The clamping swing arm 3 drives the mechanical claw 35 to move leftward into the feed bin 11 and the discharge bin 12 under the action of the rotating feed shaft 31, and the mechanical claw 35 grabs the ring from the feed and discharge elevator 5. Then the rotary feed shaft 31 drives the mechanical claw 35 to move right, to the right side of the clamping chuck 21, and then the rotary feed shaft 31 drives the mechanical claw 35 to rotate around the rotary feed shaft 31, so that the ring is facing the clamping chuck 21, and then the rotary feed shaft 31 drives the mechanical claw 35 to move left first and then right, and load the ring of the mechanical claw 35 onto the clamping chuck 21, and then the clamping swing arm 3 is reset, that is, the loading process is completed, and the ring is processed, and the mechanical claw 35 does not interfere with the feeding of the tool; While the ring is being processed, the clamping swing arm 3 is operated as described above so that the feed bin 11 clamps the next processing ring; When the ring is processed, the clamping swing arm 3 moves the unloaded mechanical claw 35 to the clamping chuck 21, clamps the processed ring, and then clamps the ring on the other mechanical claw 35 to the clamping chuck 21, and then the clamping swing arm 3 is reset, that is, the handover between unloading and loading is completed, and the next machining can be carried out; During the next machining process, the clamping swing arm 3 can place the previously processed ring into the discharge bin 12 and clamp a new ring from the feed bin 11 at the same time.

[0023] The embodiments are used to illustrate the present invention, but not to limit the present invention. Any person skilled in the art may modify the embodiments without violating the spirit and scope of the present invention, and therefore, the scope of protection of the present invention shall be as set forth in the claims of the present invention.

Claims

1. A servo swing arm loading and unloading device on a CNC machining device, comprising a rectangular machine base (1), a turning head (2) being plugged and fixed at the bottom of the machine base (1), and a clamping chuck (21) being provided on the right end surface of the turning head (2); two feeding bins (11) and a discharging bin (12) distributed in front and rear are formed on the machine base (1) on the upper side of the turning head (2), and vertical feeding and discharging elevators (5) are respectively provided in the feeding bin (11) and the discharging bin (12), and a longitudinal partition (4) is plugged and fixed in the machine base (1) on the right side of the feeding and discharging elevator (5), and a window (41) communicating with the feeding bin (11) and the discharging bin (12) is formed on the upper part of the partition (4), characterized in that: A clamping swing arm (3) is inserted on the partition (4) at the lower side of the window (41), and the clamping swing arm (3) includes a transverse rotary feed shaft (31). The right end of the rotary feed shaft (31) extends out of the partition (4) and is fixedly connected to a curved tubular rotary arm (32). The upper end of the rotary arm (32) is fixedly connected to a connecting seat (33). The upper end surface of the connecting seat (33) is fixedly connected to a longitudinal connecting plate (34). The front and rear ends of the connecting plate (34) are respectively fixedly connected to two groups of mechanical claws (35) facing the feed bin (11) and the discharge bin (12). The rotary feed shaft (31) comprises a tubular feed shaft (311) and a guide sleeve (312), wherein the feed shaft (311) is inserted into the guide sleeve (312), and the guide sleeve (312) is fixed to the top of the turning machine head (2); a spline sleeve (313) is inserted and fixed in the feed shaft (311), and a spline shaft (314) is inserted in the spline sleeve (313), and the left end of the spline shaft (314) extends out of the feed shaft (311) and is fixedly connected to the shaft of the servo motor (315) through a coupling; a transverse limiting groove (3121) is formed on the side wall of the guide sleeve (312), and a feed seat (316) is inserted in the limiting groove (3121). ), a feed seat (316) is pivotally connected to the feed shaft (311), one end of the feed seat (316) extends out of the guide sleeve (312) and is plugged and fixed with a ball nut (317), a transverse ball screw (318) is threaded inside the ball nut (317), one end of the ball screw (318) is connected to an end seat (319) through a bearing, the end seat (319) is fixed to the guide sleeve (312), the other end of the ball screw (318) is fixed to the shaft of the feed motor (310) through a coupling, the feed motor (310) is fixed to the motor bracket (320), and the motor bracket (320) and the servo motor (315) are both fixed to the top of the turning machine head (2).

2. The servo swing arm loading and unloading device on the CNC machining equipment according to claim 1, characterized in that: A plurality of groups of elevator mounting brackets (6) are fixedly connected to the top of the machine base (1), and the upper end of the conveyor belt in the inlet and outlet elevator (5) is arranged between the elevator mounting brackets (6); The conveying direction of the inlet and outlet elevator (5) in the feed bin (11) is opposite to the conveying direction of the inlet and outlet elevator (5) in the outlet bin (12).

3. The servo swing arm loading and unloading device on the CNC machining equipment according to claim 1, characterized in that: The base (1) is provided with a baffle assembly (7) for blocking the window (41), the baffle assembly (7) comprising a plurality of vertical lifting cylinders (72) fixedly connected to the top of the base (1), the lower ends of the piston rods of the lifting cylinders (72) being fixedly connected to baffles (71), the baffles (71) being in contact with the right end surface of the partition (4).

4. The servo swing arm loading and unloading device on the CNC machining equipment according to claim 1, characterized in that: The mechanical claw (35) comprises a three-claw finger cylinder (351) fixedly connected to the connecting plate (34) and arranged in a horizontal direction, and an elastic material removal frame is provided between the claws of the three-claw finger cylinder (351); The elastic material removal rack comprises a T-shaped positioning column (353) which is inserted and fixed in the middle of the cylinder body of the three-claw finger cylinder (351), and a fan-shaped material pushing plate (352) is inserted and sleeved on the positioning column (353). The material pushing plate (352) comprises a circular hub (3521), and three groups of fan-shaped branch plates (3522) are formed on the outer wall of the hub (3521). The outer end of the branch plate (3522) is inserted and fixed with a transverse guide rod (35 4); The outer ring of the cylinder body of the three-claw finger cylinder (351) is formed with a plurality of transverse step holes (3511), and the right ends of the guide rods (354) are respectively inserted into the step holes (3511) of the cylinder body of the three-claw finger cylinder (351), and a spring (355) is inserted and sleeved on the guide rod (354), and the left end of the spring (355) abuts against the branch plate (3522), and the right end abuts against the step surface of the step hole (3511).

5. The servo swing arm loading and unloading device on the CNC machining equipment according to claim 4, characterized in that: The center distances between the two groups of three-claw finger cylinders (351) on the clamping swing arm (3) and the rotary feed shaft (31) are equal, and the center distance between the three-claw finger cylinder (351) and the rotary feed shaft (31) is equal to the center distance between the clamping chuck (21) on the turning machine head (2) and the rotary feed shaft (31).

6. The servo swing arm loading and unloading device on the CNC machining equipment according to claim 4, characterized in that: The branch plates (3522) on the push plate (352) are evenly distributed in a ring shape around the central axis of the three-claw finger cylinder (351), and the diameter of the outer ring of the branch plates (3522) is greater than the diameter of the cylinder body of the three-claw finger cylinder (351).

7. The servo swing arm loading and unloading device on the CNC machining equipment according to claim 6, characterized in that: A fan-shaped boss (3523) extending to the left is formed on the left end surface of the branch plate (3522) close to the hub (3521); The right end of the positioning column (353) extends out of the cylinder body of the three-claw finger cylinder (351) and passes through the connecting plate (34) to be fixedly connected with an air pipe. A central hole (3531) connected to the air pipe is formed on the positioning column (353). An air outlet hole (3532) connected to the central hole (3531) is formed on the positioning column (353) between the push plate (352) and the cylinder body of the three-claw finger cylinder (351). A circular convex ring (3524) is formed on the right end surface of the hub (3521), the convex ring (3524) is inserted into the positioning column (353), and an annular ventilation groove (3525) opposite to the air outlet (3532) is formed on the inner wall of the convex ring (3524); an air blowing groove (3526) which is inclined and connected to the annular ventilation groove (3525) is formed on the outer wall of the fan-shaped boss (3523), and the air blowing groove (3526) is fan-shaped.

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