CN115193719B

CN115193719B - Shot-blasting pellet quality detection and screening device

Info

Publication number: CN115193719B
Application number: CN202210644450.9A
Authority: CN
Inventors: 冷智毅; 张生芳; 刘宇; 刘海涛; 尹剑; 谷红涛
Original assignee: Dalian University of Technology; Dalian Jiaotong University
Current assignee: Dalian University of Technology; Dalian Jiaotong University
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2023-07-25
Anticipated expiration: 2042-06-09
Also published as: CN115193719A

Abstract

The invention relates to the technical field of shot screening, and provides a shot quality detection and screening device, which comprises: a support mechanism and a centrifugal mechanism; the support mechanism includes: the dust-proof device comprises a base, a lower separation disc, a dust-proof box, a motor, a driven gear, a driving gear and a gear shaft; the lower separation disc is arranged on the base, a dust box and a motor are arranged in the base, and the motor is arranged on one side of the dust box; an output shaft of the motor penetrates through a shaft hole of the dust-proof box; a driving gear is arranged on an output shaft of the motor and meshed with a driven gear; the driven gear is fixed at one end of the gear shaft; the other end of the gear shaft extends out of the dust-proof box and the base and is connected with the lower separation disc; the centrifugal mechanism includes: the device comprises a centrifugal cylinder, a baffle plate, a material box, a lifting cylinder, a vibration disc, a friction disc, an upper separation disc, a sucker and a vibration cylinder. The invention can realize quality detection and screening of the pills with different sizes and improve the detection quality and effect.

Description

Shot-blasting pellet quality detection and screening device

Technical Field

The invention relates to the technical field of shot screening, in particular to a shot quality detection and screening device.

Background

The shot blasting process is a strengthening process for repeatedly impacting the surface of a processed test piece by using shot flow to enable the surface of a material to generate plastic deformation and refine internal tissues. The used pellets can generate defects such as breakage, surface pits and the like in the shot blasting process, and the defective pellets can influence the shot blasting strengthening effect and even damage the surface quality of the processed material in the processing process. To ensure shot peening quality, the used pellets need to be periodically mass screened and replaced with complete pellets.

The existing screening device only screens the pellets with the specified particle size, or the screening is performed by using a screen structure, so that the influence of the shape of the pellets on the screening size cannot be considered, and the screening efficiency is low; or other liquid medium is introduced into the centrifugal device for screening in the screening process, so that certain inconvenience is caused to the subsequent use of the pellets, the universality is not strong, and the treatment process is complex after the screening is finished.

Disclosure of Invention

The invention mainly solves the technical problems of inconvenient screening of shot pellets, low efficiency, poor universality, complex treatment process after screening is finished and the like of equipment in the prior art, and provides a shot pellet quality detection and screening device so as to realize quality detection and screening of shot pellets with different sizes and improve detection quality and effect.

The invention provides a shot quality detection and screening device, which comprises: a support mechanism and a centrifugal mechanism;

the support mechanism includes: the dust-proof device comprises a base, a lower separation disc, a dust-proof box, a motor, a driven gear, a driving gear and a gear shaft;

the lower separation disc is arranged on the base, a dust box and a motor are arranged in the base, and the motor is arranged on one side of the dust box; the output shaft of the motor penetrates through the shaft hole of the dust box and stretches into the dust box;

the output shaft of the motor is provided with a driving gear which is meshed with a driven gear, and the driving gear and the driven gear are meshed and arranged in the dust box; the driven gear is fixed at one end of the gear shaft; the other end of the gear shaft extends out of the dust-proof box and the base and is connected with the lower separation disc;

the centrifugal mechanism includes: the device comprises a centrifugal cylinder, a baffle plate, a material box, a lifting cylinder, a vibration disc, a friction disc, an upper separation disc, a sucker and a vibration cylinder;

the centrifugal cylinder is arranged above the base;

a plurality of discharge holes are distributed on the wall of the centrifugal cylinder; the centrifugal cylinder is provided with a lifting cylinder beside each discharge hole, a cylinder rod of the lifting cylinder is connected with a striker plate, and the striker plate is arranged on the discharge hole in a sliding fit manner;

a material box is arranged outside the wall of the centrifugal cylinder and below the discharge hole;

the upper separation disc and the vibration disc are arranged in the centrifugal cylinder; the upper separation disc is arranged above the lower separation disc in a matched manner; a vibration disc is arranged on the upper separation disc; the friction disc is attached to the surface of the vibration disc bottom disc;

the vibration cylinder is arranged in the base, a cylinder rod of the vibration cylinder extends out of the base, and a sucker is arranged on the cylinder rod of the vibration cylinder; the quantity of the vibrating cylinders is multiple, and the vibrating cylinders are uniformly distributed on the lower side of the lower separation disc.

Preferably, the dust box is fixed on the inner side surface of the upper surface of the base through a dust box screw.

Preferably, the driving gear is fixed at the inner side of the dust-proof box through a fixed clamping piece.

Preferably, two groups of dust-proof covers are arranged at the lower end of the dust-proof box.

Preferably, the gear shaft is connected with the lower separation disc through antifriction gaskets and bearings.

Preferably, a top cover is arranged on the centrifugal cylinder, and a feed inlet is formed in the center of the top cover;

the top cover is provided with a feeding port cover above the feeding port;

a plurality of observation windows are distributed around the feeding port.

Preferably, the material feeding port cover is arranged on the top cover through a connecting shaft and a material feeding port cover nut.

Preferably, a slope is arranged on the inner side of the centrifugal barrel, and the adjacent discharging holes are in a trend of being high on two sides and low in the middle.

Preferably, the centrifugal cylinder is provided with a lifting cylinder through a fixing frame;

the centrifugal cylinder is provided with a slideway at two sides of each discharging hole, and the baffle plate is arranged in the slideway.

Preferably, the bottom surface of the material box is provided with a magnetic paste, and the material box with the magnetic paste is placed above the contact part of the centrifugal cylinder and the base and is clung to the discharge hole of the centrifugal cylinder.

Compared with the prior art, the shot quality detection and screening device provided by the invention has the following advantages:

1. by using the structures such as the lifting cylinder, the vibrating cylinder and the friction disc, the quality screening and collecting effect of the pellets can be finished by applying centrifugal effect to the pellets under the premise of not introducing additional liquid medium, and the screened pellets can be directly put into processing and used without other subsequent treatment, so that the quality and efficiency of screening the pellets are improved, and the subsequent processing efficiency is improved;

2. the vibration disc is driven by the variable frequency motor to generate centrifugal effect, the effect of screening and collecting the quality of the pellets with the same particle size is realized by small-range speed regulation, meanwhile, the effect of screening and collecting the pellets with different sizes can be realized by the speed regulation, and the accuracy and the efficiency of detecting and screening the quality of the pellets are improved;

3. the key components are in modularized design, so that the maintenance and replacement are convenient, the structure is simple, the size is small, and the installation and the use are convenient.

Drawings

FIG. 1 is a schematic diagram showing the overall assembly of a shot quality inspection and screening apparatus according to the present invention;

FIG. 2 is a schematic illustration of the general assembly of the support mechanism provided by the present invention;

FIG. 3 is a schematic view of the interior assembly of the dust box provided by the present invention;

FIG. 4 is a schematic view of the gear shaft fixing provided by the present invention;

FIG. 5 is a schematic view of a lower separator plate fixture provided by the present invention;

FIG. 6 is a schematic view of the internal assembly of the centrifugal mechanism provided by the present invention;

FIG. 7 is a schematic view of a vibration plate package and upper separation plate attachment provided by the present invention;

FIG. 8 is a schematic diagram of the mating of upper and lower separator plates provided by the present invention;

FIG. 9 is a schematic diagram of a centrifugal mechanism assembly provided by the present invention;

FIG. 10 is a schematic view of the shape of the ramp in the barrel of the centrifugal mechanism provided by the invention;

FIG. 11 is a schematic view of a vibration mode provided by the present invention;

FIG. 12 is a schematic diagram of the workflow of the shot quality inspection and screening apparatus according to the present invention.

Reference numerals: 1-a supporting mechanism; 2-a centrifugal mechanism; 101-a base; 102-lower separation tray; 103-a dust box; 104-a motor; 105-dust box screw; 106, a dust cover; 107-driven gear; 108-a drive gear; 109-securing the clip; 110-gear shaft; 111-driven gear nut; 112-antifriction shims; 113 bearings; 201-centrifuging the cylinder; 202-a top cover; 203, a material feeding port cover; 204-a connecting shaft; 205—a feed port cap nut; 206—a viewing window; 207-striker plate; 208-magazine; 209-magnetic paste; 210-lifting cylinder; 211-fixing frame; 212-vibrating disc screws; 213-vibrating plate; 214-friction disc; 215-upper separation disc; 216-sucking disc; 217-vibrating cylinder.

Detailed Description

In order to make the technical problems solved by the invention, the technical scheme adopted and the technical effects achieved clearer, the invention is further described in detail below with reference to the accompanying drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the matters related to the present invention are shown in the accompanying drawings.

As shown in fig. 1, the shot quality detecting and screening apparatus according to the embodiment of the present invention includes: a support mechanism 1 and a centrifugal mechanism 2.

The support mechanism 1 includes: a base 101, a lower separation plate 102, a dust box 103, a motor 104, a driven gear 107, a driving gear 108 and a gear shaft 110;

as shown in fig. 2 and 3, the lower separating disc 102 is arranged on the base 101, a dust box 103 and a motor 104 are arranged in the base 101, the motor 104 is arranged on one side of the dust box 103, and in particular, the motor 104 is arranged on a motor mounting seat at the bottom of the base 101; the output shaft of the motor 104 passes through the shaft hole of the dust box 103 and extends into the dust box 103. Specifically, the dust box 103 is fixed to the inner surface of the upper surface of the base 101 by a dust box screw 105.

A driving gear 108 is arranged on the output shaft of the motor 104. The driving gear 108 is meshed with the driven gear 107, the driving gear 108 and the driven gear 107 are meshed and arranged in the dust box 103, the driving gear 108 is fixed on the inner side of the dust box 103 through the fixing clamping piece 109, and two groups of dust box covers 106 are arranged at the lower end of the dust box 103. The driven gear 107 is fixed at one end of the gear shaft 110 through a driven gear nut 111; the other end of the gear shaft 110 protrudes out of the dust box 103 and the base 101 and is connected to the lower separation plate 102. As shown in fig. 4 and 5, the gear shaft 110 is connected to the lower separation disc 102 via antifriction pads 112 and bearings 113. Specifically, the bearing 113 is installed in a bearing housing on the upper surface of the base 101, and the gear shaft 110 is fixed in the base 101 through a central hole of the bearing 113. Friction reducing pads 112 are tiled in grooves on the upper surface of base 101; the lower separation disc 102 is covered on the antifriction pad 112, and when the antifriction pad is installed, the spline grooves of the central hole of the lower separation disc 102 and the spline of the gear shaft 110 are ensured to be matched and fixed, and after the matched and fixed, the lower separation disc 102 and the gear shaft 110 are fixed by using the nut 111.

In the present embodiment, the supporting mechanism 1 is rotated by the motor 104, the driving gear 108 and the driven gear 107 transmit power to the lower separation disc 102, so that the lower separation disc 102 can rotate; meanwhile, the motor 104 can be controlled in a speed regulation way, so that the speed of the lower separation disc 102 can be regulated according to the actual working condition requirement.

The centrifugal mechanism 2 includes: a centrifugal barrel 201, a baffle 207, a magazine 208, a lifting cylinder 210, a vibration plate 213, a friction plate 214, an upper separation plate 215, a suction cup 216, and a vibration cylinder 217.

The centrifuge bowl 201 is disposed above the base 101. As shown in fig. 9, a top cover 202 is arranged on the centrifugal barrel 201, and a feed port is arranged in the center of the top cover 202; the top cover 202 is provided with a feed port cover 203 above the feed port; a plurality of observation windows 206 are distributed around the feed inlet. The material feeding port cover 203 is installed on the top cover 202 through a connecting shaft 204 and material feeding port cover nuts 205 at the upper end and the lower end, and the material feeding port cover 203 can manually rotate along the connecting shaft 204. The viewing window 206 is fixedly mounted from the underside of the top cover 202. The top cover 202 and the material inlet cover 203 of the observation window 206 are sleeved at the opening of the centrifugal barrel 201, so that the centrifugal mechanism is sealed.

A plurality of discharge holes are distributed on the wall of the centrifugal barrel 201, and in particular, four discharge holes can be arranged; the centrifugal cylinders 201 are provided with lifting cylinders 210 beside each discharging hole, the centrifugal cylinders 201 are provided with lifting cylinders 210 through fixing frames 211, and the lifting cylinders 210 are nested inside the fixing frames 211. The cylinder rod of the lifting cylinder 210 is connected with a striker plate 207, and the striker plate 207 is arranged on the discharge hole in a sliding fit manner. The centrifugal cylinders 201 are provided with slide ways on two sides of each discharge hole, and the baffle plates 207 are arranged in the slide ways.

In this embodiment, the centrifugal barrel 201 can completely wrap internal structures such as the vibration disc 213, so that dust is prevented from polluting the environment when the device is used, meanwhile, a slope is arranged on the inner side of the centrifugal barrel 201, and the adjacent discharging holes are inclined at the two sides and the middle is inclined, as shown in fig. 10, so that the screened pellets can be automatically slipped after being thrown out under the centrifugal action, roll out from the round opening of the centrifugal barrel 201 and fall into the material box 208, and the screened pellets are collected.

A material box 208 is arranged outside the cylinder wall of the centrifugal cylinder 201 and below the discharge hole; the bottom surface of the material box 208 is provided with a magnetic patch 209, and the material box 208 with the magnetic patch 209 is placed above the contact part of the centrifugal barrel 201 and the base 101 and is closely attached to the discharging hole of the centrifugal barrel 201.

As shown in fig. 6-8, the upper separation disc 215 and the vibration disc 213 are arranged in the centrifugal barrel 201; the upper separation disc 215 is cooperatively arranged above the lower separation disc 102; the upper separation disc 215 is provided with a vibration disc 213, and specifically the upper separation disc 215 is connected with the vibration disc 213 through a vibration disc screw 212; the friction plate 214 is attached to the chassis surface of the vibration plate 213. Wherein, when the upper separating disc 215 and the vibrating disc 213 are assembled with the lower separating disc 102, it should be ensured that the protruding blades on the lower surface of the upper separating disc 215 are engaged with the rectangular pits on the upper surface of the lower separating disc 102, and the protruding truncated cone portion on the lower surface of the upper separating disc 215 is contacted with the truncated cone-shaped pits on the upper surface of the lower separating disc 102. The effect after specific assembly is shown in fig. 8.

The vibration cylinder 217 is arranged in the base 101, a cylinder rod of the vibration cylinder 217 extends out of the base 101, and a sucker 216 is arranged on the cylinder rod of the vibration cylinder 217; the number of the vibrating cylinders 217 is plural, and the vibrating cylinders 217 are uniformly distributed on the outer side of the lower separation disc 102.

In the embodiment, the centrifugal mechanism 2 is in butt joint with the lower separation disc 102 through the upper separation disc 215, and transmits the power of a motor to the vibration disc 213, so that the functions of rotating and regulating the speed of the vibration disc 213 are realized, and the purpose of screening shot blasting particles is further achieved; while realizing the function of screening the pellets, the centrifugal mechanism 2 can lift the vibration plate 213 through the vibration cylinder 217, and can regularly lift and lower the pellets in the vibration plate 213 according to the preset action through the vibration cylinder 217, so that the pellets can be more uniformly distributed in the vibration plate 213, and the quality screening effect of the equipment on the pellets is improved.

In addition, the invention also has a control mechanism which adopts PLC control and mainly controls the motor 104, the vibrating cylinder 217 and the lifting cylinder 210, thereby realizing the functions of starting, stopping, vibrating disk rotation, vibrating disk vibration, vibrating disk rotation speed adjustment and the like of the shot quality detection and screening device. And the manual adjustment can be performed according to actual needs.

The shot-blasting pellet quality detection and screening device provided by the invention can control the aspects of cylinder lifting, vibration disc speed regulation, vibration disc start-stop control and the like, and realizes detection and screening of shot-blasting pellet quality. As shown in fig. 10-12, the specific operation of the device is as follows:

step 1: placing the material box 208 at the correct position, and shrinking the lifting cylinder 210 to drive the material baffle 207 to slide downwards so as to block the discharge hole on the centrifugal barrel 201; the feeding port cover 203 is unscrewed, a proper amount of pellets are fed, and the feeding amount of the pellets is observed through the observation window 206 in the feeding process; after the completion of the feeding, the feeding port cover 203 is rotated and closed.

Step 2: as shown in fig. 11, in the starting device, the cylinder rod of the vibrating cylinder 217 extends to drive the sucking disc 216 to be adsorbed on the lower side of the vibrating disc 213, and lift the vibrating disc 213 together with the upper separating disc 215, so that the upper separating disc 215 is separated from the lower separating disc 102; after the separation of the upper separation plate 215 from the lower separation plate 102 is completed, the four vibration cylinders 217 are periodically and sequentially contracted and contracted in small amplitude, so that the vibration plate 213 regularly vibrates, and the pellets poured on the vibration plate 213 are uniformly distributed.

Step 3: the cylinder rod of the vibrating cylinder 217 is retracted to pull the sucking disc 216 adsorbed on the lower side of the vibrating disc 213 away; because the groove of the lower separation disc 102 is provided with a small slope, the blades on the lower surface of the upper separation disc 215 can be guaranteed to be matched with the rectangular groove of the lower separation disc 102, and the upper separation disc 215 is fixedly meshed with the lower separation disc 102; the lifting cylinder 210 extends out of the cylinder rod to drive the baffle 207 to lift, and the opening of the centrifugal barrel 201 is opened.

Step 4: the motor 104 is started, and the motor 104 drives the driving gear 108 to rotate and drives the driven gear 107 to rotate; the driven gear 107 rotates to drive the gear shaft 110 to rotate, so that the lower separating disc 102, the upper separating disc 215 and the vibrating disc 213 rotate together, and finally, the power provided by the motor 104 is transmitted to the vibrating disc 213.

Step 5: because the pellets with defects have relatively less kinetic energy than the complete pellets in the vibration disc centrifugation process, and the friction effect generated by the friction disc 214 is relatively difficult to overcome, the relatively complete pellets can be thrown out by the centrifugation process more easily against the friction in the low-rotation-speed process; the complete pellets are centrifugally thrown out through the vibration disc 213, then roll in a slope in the centrifugal barrel 201 and roll out from the opening, and fall into the material box 208, so that the screening and collection of the complete pellets are completed.

Step 6: after complete screening and collection of the complete pellets, the apparatus is stopped and the magazine 208 is replaced.

Step 7: step 5 is repeatedly performed, in the process, the motor 104 increases the speed of the vibration plate 213 to increase the initial kinetic energy obtained by the damaged pellets, so that the damaged pellets can overcome the friction effect generated by the friction plate 214 and be thrown out, and finally fall into the replaced material box 208, thereby completing screening and collection of the damaged pellets.

According to the shot-blasting pellet quality detection and screening device provided by the invention, the lifting cylinder 210, the vibrating cylinder 217, the vibrating disc 213 and other components are arranged, so that the lifting cylinder 210, the vibrating disc 213, the speed regulation of the vibrating disc 213, the start and stop of the vibrating disc 213 and other components can be effectively controlled, on the premise that other liquid mediums are not introduced in the working process of equipment, the piled pellets are uniformly distributed through vibration, then the rotating speed of the vibrating disc 213 is adjusted in a small range, and the quality screening and collection of pellets with the same particle size are completed through centrifugal action; the quality detection, screening and recovery functions of the pellets with different particle diameters can be realized by adjusting the rotation speed of the vibration plate 213, so that the quality detection accuracy and screening efficiency of the pellets used in the shot blasting process are improved. The device mainly obtains different kinetic energies under the centrifugal action according to the pellets with different integrity degrees, and the capability of overcoming friction is also different. Intact pellets are easier to throw out against friction, whereas incomplete pellets require higher rotational speeds to overcome friction. The brushing and collection of the pellets is accomplished by a speed regulating operation of the motor 104.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments is modified or some or all of the technical features are replaced equivalently, so that the essence of the corresponding technical scheme does not deviate from the scope of the technical scheme of the embodiments of the present invention.

Claims

1. Shot quality detection and screening device, characterized by comprising: a supporting mechanism (1) and a centrifugal mechanism (2);

the support mechanism (1) comprises: the dust-proof device comprises a base (101), a lower separation disc (102), a dust-proof box (103), a motor (104), a driven gear (107), a driving gear (108) and a gear shaft (110);

the lower separation disc (102) is arranged on the base (101), a dust box (103) and a motor (104) are arranged in the base (101), and the motor (104) is arranged on one side of the dust box (103); an output shaft of the motor (104) penetrates through a shaft hole of the dust box (103) and stretches into the dust box (103);

a driving gear (108) is arranged on an output shaft of the motor (104), the driving gear (108) is meshed with a driven gear (107), and the driving gear (108) and the driven gear (107) are meshed and arranged in the dust box (103); the driven gear (107) is fixed at one end of the gear shaft (110); the other end of the gear shaft (110) extends out of the dust box (103) and the base (101) and is connected with the lower separation disc (102);

the centrifugal mechanism (2) comprises: a centrifugal cylinder (201), a baffle plate (207), a material box (208), a lifting cylinder (210), a vibration disc (213), a friction disc (214), an upper separation disc (215), a sucker (216) and a vibration cylinder (217);

the centrifugal cylinder (201) is arranged above the base (101);

a plurality of discharge holes are distributed on the wall of the centrifugal cylinder (201); the centrifugal cylinders (201) are provided with lifting cylinders (210) beside each discharge hole, cylinder rods of the lifting cylinders (210) are connected with the material baffle plates (207), and the material baffle plates (207) are arranged on the discharge holes in a sliding fit manner;

a material box (208) is arranged outside the cylinder wall of the centrifugal cylinder (201) and below the discharge hole;

the upper separation disc (215) and the vibration disc (213) are arranged in the centrifugal barrel (201); the upper separation disc (215) is cooperatively arranged above the lower separation disc (102); a vibration plate (213) is arranged on the upper separation plate (215); the friction disc (214) is attached to the surface of the chassis of the vibration disc (213);

the vibration cylinder (217) is arranged in the base (101), a cylinder rod of the vibration cylinder (217) extends out of the base (101), and a sucker (216) is arranged on the cylinder rod of the vibration cylinder (217); the number of the vibrating cylinders (217) is multiple, and the vibrating cylinders (217) are uniformly distributed on the lower side of the lower separation disc (102).

2. The shot quality detecting and screening apparatus according to claim 1, wherein the dust box (103) is fixed to an inner side surface of an upper surface of the base (101) by a dust box screw (105).

3. Shot quality detection and screening device according to claim 1, characterized in that the driving gear (108) is fixed inside the dust box (103) by means of a fixed clip (109).

4. A shot quality inspection and screening apparatus according to claim 1 or 3, characterized in that two sets of dust-proof covers (106) are mounted at the lower end of the dust-proof box (103).

5. Shot mass detection and screening device according to claim 1, characterized in that the gear shaft (110) is connected to the lower separation disc (102) by means of antifriction washers (112) and bearings (113).

6. The shot mass detection and screening device according to claim 1, wherein a top cover (202) is provided on the centrifugal barrel (201), and a feed port is provided in the center of the top cover (202);

the top cover (202) is provided with a feed port cover (203) above the feed port;

a plurality of observation windows (206) are distributed around the feeding port.

7. The shot quality inspection and screening apparatus according to claim 6, wherein the feed port cover (203) is mounted on the top cover (202) via a connecting shaft (204) and a feed port cover nut (205).

8. The shot quality inspection and screening apparatus according to claim 1, wherein a slope is provided inside the centrifugal barrel (201) and has a tendency to be higher on both sides and lower on the middle with respect to the adjacent discharge holes.

9. Shot mass detection and screening device according to claim 1 or 8, characterized in that the centrifugal cylinder (201) is fitted with a lifting cylinder (210) by means of a fixing frame (211);

the centrifugal cylinders (201) are provided with slide ways on two sides of each discharging hole, and the baffle plates (207) are arranged in the slide ways.

10. The shot quality detection and screening device according to claim 1, wherein a magnetic patch (209) is provided on the bottom surface of the magazine (208), and the magazine (208) with the magnetic patch (209) is placed above the contact portion of the centrifugal barrel (201) and the base (101) and is closely attached to the discharge hole of the centrifugal barrel (201).