CN217285403U

CN217285403U - Handheld berry juicing treatment device

Info

Publication number: CN217285403U
Application number: CN202123054849.1U
Authority: CN
Inventors: 郭梦婷
Original assignee: Individual
Current assignee: Kashi Mufeng Wine Industry Co ltd
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2022-08-26
Anticipated expiration: 2031-12-07

Abstract

The utility model discloses a hand-held berry processing apparatus that squeezes juice relates to kitchen appliance technical field, comprising a base plate, the push pipe fixedly connected with press box of bottom plate, the both sides fixedly connected with positioning sleeve of press box, positioning sleeve's inside fixedly connected with powerful motor, the output shaft one end fixedly connected with third electric telescopic handle of powerful motor. This hand-held type berry juice extraction processing apparatus, through first motor, the electric power adjustment base, the connecting plate, the cooperation setting of first locating hole and second locating hole, when needs wash the device, open sealed lid, add the inside of press box with water and sanitizer, start electric power provides the device, first motor utilizes second electric telescopic handle to drive the connecting plate rotatory after the speed reduction of harmonic speed reducer ware, open the valve, waste liquid after the cleanness is discharged from the connecting tube, reach the inside abluent effect to the press box, guarantee can wash everywhere inside the press box.

Description

Handheld berry juicing treatment device

Technical Field

The utility model relates to a kitchen appliance technical field specifically is a hand-held type berry processing apparatus that squeezes juice.

Background

The juicer is a machine capable of quickly squeezing fruits and vegetables to obtain fruit and vegetable juice, and is small and household. There are two main types of consumer groups of juicers: one family is a family with children or the old, the children are easy to eat and the old has bad teeth, and the juice squeezed by the children can meet the requirement that the children take enough nutrition; the other type is young people pursuing fashion and life taste, and the juice extractor meets the requirements of the young people on advocating individual tastes. With the improvement of the quality of life, the mind of consumers is shifted from the most basic life needs to the nutritional and healthy taste life, which provides possibility for the more popularization of the juice extractor. The existing hand-held berry juicing treatment device is inconvenient to clean.

In the patent application number of the Chinese utility model: CN201721222908.2 discloses a continuity berry processing jar device that squeezes juice, including pulp filter screen, berry processing jar, the broken fragment of slip, berry add fill, a feeding section of thick bamboo and the broken fragment of drive, the welding of berry processing tank bottom has a collection liquid funnel, berry processing jar is fixed in the frame, a feeding section of thick bamboo is installed at berry processing tank top, feeding section of thick bamboo right-hand member upside connection berry adds the fill. This hand-held berry processing apparatus that squeezes juice, under the circumstances of normal work, it still has the not good shortcoming of effect of squeezing juice.

Therefore, there is a need for a hand-held berry juice processing device to solve the above problems.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

An object of the utility model is to provide a hand-held berry processing apparatus that squeezes juice to current hand-held berry that proposes in solving above-mentioned background art squeezes juice among the processing apparatus and is not convenient for wash and the not good problem of effect of squeezing juice.

(II) technical scheme

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: a hand-held berry juicing treatment device comprises a bottom plate, wherein a squeezing box is fixedly connected to a top pipe of the bottom plate, positioning sleeves are fixedly connected to two sides of the squeezing box, a powerful motor is fixedly connected to the inside of each positioning sleeve, a third electric telescopic rod is fixedly connected to one end of an output shaft of the powerful motor, a sealing plate is movably connected to the outer side of one end of a piston rod of the third electric telescopic rod, a crushing device is fixedly connected to one end of a piston rod of the third electric telescopic rod, a filtering plate is fixedly connected to the bottom end inside the squeezing box, a connecting pipeline is fixedly connected to one end of the squeezing box, a valve is arranged at one end, away from the squeezing box, of the connecting pipeline, a hand-holding sleeve is fixedly connected to the outer side of the middle of the squeezing box, a sealing collar is fixedly connected to the top end of the squeezing box, and a bearing frame is fixedly connected to the top end outside the squeezing box, the top end of the bearing frame is fixedly connected with a first electric telescopic rod, the top end of the first electric telescopic rod is fixedly connected with a connecting seat, one end of the connecting seat, far away from the first electric telescopic rod, is fixedly connected with a sealing cover, the middle part of the top end of the sealing cover is fixedly connected with an electric power supply device, both sides of the top end of the sealing cover are respectively provided with an air hole, the middle part of the top end of the inner side of the sealing cover is fixedly connected with an electric power adjusting base, the inside of the electric power adjusting base is fixedly connected with a first motor, the bottom end of the first motor is rotatably connected with a harmonic reducer, the bottom end of the harmonic reducer is rotatably connected with a second electric telescopic rod, both ends of the outer side of a piston rod of the second electric telescopic rod are respectively and fixedly connected with a connecting plate, the bottom end of the connecting plate is fixedly connected with a ventilating plate, both sides of the ventilating plate are respectively provided with a second positioning hole, and the bottom end of the piston rod of the second electric telescopic rod is fixedly connected with a protective shell, the inside fixedly connected with second motor of protecting sheathing, the output shaft one end fixedly connected with of second motor grinds ventilative dish, the inside both sides of grinding ventilative dish all are equipped with first locating hole.

Preferably, the number of the positioning sleeves is two, and the two positioning sleeves are symmetrically distributed on two sides of the press box.

Preferably, the number of the sealing plates is two, the two sealing plates are symmetrically distributed inside the positioning sleeve, and the diameter of each sealing plate is equal to the inner diameter of the positioning sleeve.

Preferably, the centre line of the carrier is collinear with the centre line of the press box, and the inner diameter of the carrier is equal to the outer diameter of the press box.

Preferably, the number of the first electric telescopic rods is four, and the four first electric telescopic rods are distributed at the top end of the bearing frame in an equidistant annular array.

Preferably, the number of the connecting plates is two, and the two connecting plates are symmetrically distributed at the top end of the ventilating plate.

Preferably, the diameter of the grinding ventilating disc is equal to the inner diameter of the press box, and the central line of the grinding ventilating disc and the central line of the second motor are collinear.

Preferably, the number of the first positioning holes and the number of the second positioning holes are two, the two first positioning holes are symmetrically distributed in the grinding breathable plate, the two second positioning holes are symmetrically distributed in the breathable plate, and the center distance between the two first positioning holes is equal to the center distance between the two second positioning holes.

(III) advantageous effects

Compared with the prior art, the utility model provides a hand-held berry juice processing apparatus possesses following beneficial effect:

1. the hand-held berry juicing treatment device comprises a powerful motor, a third electric telescopic rod, a smashing device, a grinding ventilation disc and a second electric telescopic rod, wherein when berries need to be juiced, the hand-held sleeve is held by hands, the stability of the device is increased, the first electric telescopic rod is started, the first electric telescopic rod enables a sealing cover to be separated from a sealing collar by using a connecting seat under the support of a bearing frame, when the sealing cover moves to a sufficient height, the berries are placed at the top end of a filter plate, the sealing cover is reset by using the first electric telescopic rod again, the third electric telescopic rod is started, the third electric telescopic rod pushes the smashing device to extrude the berries and simultaneously starts the powerful motor, the powerful motor drives the smashing device to rotate, the smashing device preliminarily smashes the berries, the second electric telescopic rod is started, the grinding ventilation disc is moved to the surface of the berries after preliminary smashing by the second electric telescopic rod, start the second motor, the second motor drives under protective housing's protection and grinds ventilative dish rotation, grind ventilative dish and make the inside stone of berry also grind simultaneously the gas permeable plate with grind ventilative dish and squeeze out the fruit juice of berry under second electric telescopic handle's effect, at the in-process of squeezing fruit juice, the air of press box inside is through grinding ventilative dish and gas permeable plate from the bleeder vent discharge, open the valve, fruit juice filters the back through the filter and discharges from connecting tube, reach the effect of squeezing the berry, the juicing rate of device has been improved, the assurance is smashed the berry, squeeze juice after grinding again, thereby improve the juice rate of berry.

2. The hand-held berry juicing treatment device comprises a first motor, an electric power adjusting base, a connecting plate, a first positioning hole and a second positioning hole, wherein when the device needs to be cleaned, a sealing cover is opened, water and a cleaning agent are added into a squeezing box, an electric power supply device is started, the electric power supply device supplies electric power to the first motor, the first motor is decelerated by a harmonic reducer and then drives the connecting plate to rotate by using a second electric telescopic rod, the connecting plate drives a breathable plate to rotate, after a second positioning hole on the breathable plate is overlapped with the first positioning hole, the sealing cover is closed, the water and the cleaning agent can move to the upper part of the breathable plate and a grinding breathable disc, the power of the electric power supply device is increased by using the electric power adjusting base, the rotating speed of the first motor is accelerated, the first motor drives the connecting plate to rotate, the connecting plate mixes the water and the cleaning agent in the squeezing box and cleans the interior of the squeezing box, after the washing, open the valve, the abluent waste liquid of back is discharged from the connecting tube, reaches the abluent effect in the press box, has improved the convenience of device, guarantees to wash everywhere in the press box.

Drawings

FIG. 1 is an axial view of the structure of the present invention;

FIG. 2 is a schematic view of the press box structure according to the present invention;

FIG. 3 is a schematic view of the sealing cap structure of the present invention;

fig. 4 is a schematic axial view of a second motor structure according to the present invention;

fig. 5 is a schematic cross-sectional view of the positioning sleeve structure of the present invention.

In the figure: 1. a base plate; 2. a positioning sleeve; 3. connecting a pipeline; 4. a valve; 5. a press box; 6. holding the sleeve; 7. a first electric telescopic rod; 8. a carrier; 9. a connecting seat; 10. a sealing cover; 11. a power supply device; 12. air holes are formed; 13. a filter plate; 14. a sealing collar; 15. a harmonic reducer; 16. a second electric telescopic rod; 17. grinding the breathable disc; 18. a first positioning hole; 19. a connecting plate; 20. a protective housing; 21. a second motor; 22. a gas permeable plate; 23. a second positioning hole; 24. a powerful motor; 25. a third electric telescopic rod; 26. a sealing plate; 27. a crushing device; 28. a power conditioning base; 29. a first motor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-5, a hand-held berry juicing device comprises a bottom plate 1, a top pipe of the bottom plate 1 is fixedly connected with a squeezing box 5, two positioning sleeves 2 are fixedly connected to two sides of the squeezing box 5, the two positioning sleeves 2 are symmetrically distributed on two sides of the squeezing box 5 to ensure that a positioning base is provided for a strong motor 24 and a sealing plate 26, and also ensure that a smashing device 27 can be taken into the positioning sleeve 2 when the squeezing box is static, the strong motor 24 is fixedly connected to the inside of the positioning sleeve 2, the strong motor 24, a third electric telescopic rod 25, the smashing device 27, a grinding breathable disc 17 and a second electric telescopic rod 16 are arranged in a matching way, when berries need to be juiced, the sleeve 6 is held by hand to increase the stability of the device, the first electric telescopic rod 7 is started, the first electric telescopic rod 7 is supported by a bearing frame 8, a sealing cover 10 is separated from a sealing collar 14 by a connecting seat 9, after the sealing cover 10 is moved to a sufficient height, berries are placed on the top end of the filtering plate 13, the first electric telescopic rod 7 is reused to reset the sealing cover 10, the third electric telescopic rod 25 is started, the third electric telescopic rod 25 pushes the smashing device 27 to extrude the berries and simultaneously starts the powerful motor 24, the powerful motor 24 drives the smashing device 27 to rotate, the smashing device 27 preliminarily smashes the berries, the second electric telescopic rod 16 is started, the second electric telescopic rod 16 moves the grinding ventilation disc 17 to the surface of the preliminarily smashed berries, the second motor 21 is started, the second motor 21 drives the grinding ventilation disc 17 to rotate under the protection of the protective shell 20, the grinding ventilation disc 17 enables the kernels in the berries to be ground, the ventilation plate 22 and the grinding ventilation disc 17 squeeze all juice of the berries under the action of the second electric telescopic rod 16, and in the process of squeezing the juice, air in the squeezing box 5 is discharged from the air holes 12 through the grinding air-permeable disc 17 and the air-permeable plate 22, the valve 4 is opened, fruit juice is discharged from the connecting pipeline 3 after being filtered by the filter plate 13, the effect of squeezing berries is achieved, the juice squeezing rate of the device is improved, the berries are guaranteed to be smashed, and juice is squeezed again after being ground, so that the juice squeezing rate of the berries is improved, one end of an output shaft of the powerful motor 24 is fixedly connected with a third electric telescopic rod 25, a sealing plate 26 is movably connected to the outer side of one end of a piston rod of the third electric telescopic rod 25, the two sealing plates 26 are symmetrically distributed in the positioning sleeve 2, the diameters of the two sealing plates 26 are equal to the inner diameter of the positioning sleeve 2, it is guaranteed that no liquid is in contact with the powerful motor 24 when the squeezing box 5 is cleaned, the powerful motor 24 is damaged, one end of the piston rod of the third electric telescopic rod 25 is fixedly connected with a smashing device 27, the bottom end inside the squeezing box 5 is fixedly connected with a filtering plate 13, one end of the squeezing box 5 is fixedly connected with a connecting pipeline 3, one end of the connecting pipeline 3, which is far away from the squeezing box 5, is provided with a valve 4, the outer side of the middle part of the squeezing box 5 is fixedly connected with a handheld sleeve 6, the top end of the squeezing box 5 is fixedly connected with a sealing collar 14, the top end of the outer side of the squeezing box 5 is fixedly connected with a bearing frame 8, the central line of the bearing frame 8 and the central line of the squeezing box 5 are in the same straight line, the inner diameter of the bearing frame 8 is equal to the outer diameter of the squeezing box 5, so as to ensure that a positioning foundation and a stress foundation are provided for the first electric telescopic rod 7, the top end of the bearing frame 8 is fixedly connected with four first electric telescopic rods 7, the four first electric telescopic rods 7 are distributed on the top end of the bearing frame 8 in an equidistant annular array manner, so as to ensure that the sealing cover 10 and the squeezing box 5 can be stably driven to be separated and combined, the top end of the first electric telescopic rod 7 is fixedly connected with a connecting seat 9, one end of the connecting seat 9, which is far away from the first electric telescopic rod 7, is fixedly connected with a sealing cover 10, the middle part of the top end of the sealing cover 10 is fixedly connected with an electric power supply device 11, both sides of the top end of the sealing cover 10 are respectively provided with an air hole 12, the middle part of the top end of the inner side of the sealing cover 10 is fixedly connected with an electric power adjusting base 28, the inside of the electric power adjusting base 28 is fixedly connected with a first motor 29, the electric power adjusting base 28, a connecting plate 19, a first positioning hole 18 and a second positioning hole 23 are arranged in a matching way, when the device needs to be cleaned, the sealing cover 10 is opened, water and a cleaning agent are added into the squeezing box 5, the electric power supply device 11 is started, the electric power supply device 11 supplies electric power to the first motor 29, the first motor 29 utilizes the second electric telescopic rod 16 to drive the connecting plate 19 to rotate after being decelerated by a harmonic reducer 15, the connecting plate 19 drives the ventilating plate 22 to rotate, after a second positioning hole 23 on the ventilating plate 22 is superposed with the first positioning hole 18, the sealing cover 10 is closed, water and a cleaning agent can move to the upper portion of the ventilating plate 22 and the upper portion of the grinding ventilating disc 17, the power of the power supply device 11 is increased by the aid of the power adjusting base 28, the rotating speed of the first motor 29 is increased, the first motor 29 drives the connecting plate 19 to rotate, the connecting plate 19 mixes the water and the cleaning agent in the squeezing box 5 and cleans the interior of the squeezing box 5, after cleaning is finished, the valve 4 is opened, cleaned waste liquid is discharged from the connecting pipeline 3, the effect of cleaning the interior of the squeezing box 5 is achieved, convenience of the device is improved, it is guaranteed that cleaning can be carried out on all positions in the squeezing box 5, the harmonic reducer 15 is rotatably connected to the bottom end of the first motor 29, the second electric telescopic rod 16 is rotatably connected to the bottom end of the harmonic reducer 15, the second electric telescopic rod 16 is a waterproof electric telescopic rod, two connecting plates 19 are fixedly connected to two ends of the outer side of a piston rod of the second electric telescopic rod 16, the two connecting plates 19 are symmetrically distributed at the top end of the air permeable plate 22, the air permeable plate 22 is connected with the second electric telescopic rod 16, water and detergent can be stirred under the action of the first motor 29, the air permeable plate 22 is fixedly connected to the bottom end of the connecting plate 19, second positioning holes 23 are formed in two sides of the air permeable plate 22, the protective shell 20 is fixedly connected to the bottom end of the piston rod of the second electric telescopic rod 16, the second motor 21 is fixedly connected to the inner portion of the protective shell 20, the grinding air permeable disc 17 is fixedly connected to one end of an output shaft of the second motor 21, the diameter of the grinding air permeable disc 17 is equal to the inner diameter of the squeezing box 5, the central line of the grinding air permeable disc 17 is the same straight line with the central line of the second motor 21, the grinding ventilating disc 17 is guaranteed to smoothly rotate inside the press box 5, the first positioning holes 18 are formed in two sides of the inside of the grinding ventilating disc 17, the first positioning holes 18 and the second positioning holes 23 are two, the two first positioning holes 18 are symmetrically distributed in the grinding ventilating disc 17, the two second positioning holes 23 are symmetrically distributed in the ventilating plate 22, the center distance between the two first positioning holes 18 is equal to the center distance between the two second positioning holes 23, it is guaranteed that the first positioning holes 18 and the second positioning holes 23 can be coincided through rotation, and flow paths are provided for water and cleaning agents.

The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.

The working principle is as follows: the device is working, when the berry needs to be juiced, the device is held by hand to hold the sleeve 6, the stability of the device is increased, the first electric telescopic rod 7 is started, the first electric telescopic rod 7 enables the sealing cover 10 to be separated from the sealing collar 14 by the connecting seat 9 under the support of the bearing frame 8, after the sealing cover 10 moves to a sufficient height, the berry is placed at the top end of the filtering plate 13, the first electric telescopic rod 7 is reused to reset the sealing cover 10, the third electric telescopic rod 25 is started, the third electric telescopic rod 25 pushes the smashing device 27 to extrude the berry and simultaneously starts the powerful motor 24, the powerful motor 24 drives the smashing device 27 to rotate, the smashing device 27 conducts primary smashing on the berry, the second electric telescopic rod 16 is started, the second electric telescopic rod 16 moves the grinding ventilation disc 17 to the surface of the primarily smashed berry, the second motor 21 is started, the second motor 21 drives the grinding ventilation disc 17 to rotate under the protection of the protective shell 20, grinding ventilation disc 17 enables the kernels inside the berries to be ground, ventilation plate 22 and grinding ventilation disc 17 press out all juice of the berries under the action of second electric telescopic rod 16, in the process of pressing juice, air inside pressing box 5 is discharged from ventilation hole 12 through grinding ventilation disc 17 and ventilation plate 22, valve 4 is opened, the juice is discharged from connecting pipeline 3 after being filtered by filter plate 13, crushing and then juicing are guaranteed, the juice yield of the berries is improved, when the device needs to be cleaned, sealing cover 10 is opened, water and detergent are added into pressing box 5, electric power supply device 11 is started, electric power is supplied to first motor 29 by electric power supply device 11, first motor 29 is decelerated by harmonic reducer 15, second electric telescopic rod 16 is used for driving connecting plate 19 to rotate, connecting plate 19 drives ventilation plate 22 to rotate, second locating hole 23 on ventilative board 22 and first locating hole 18 coincidence back, close sealed lid 10, water and sanitizer can move ventilative board 22 and grind the top of ventilative dish 17, utilize the power of electric power regulation base 28 increase electric power providing device 11, first motor 29 rotational speed accelerates, first motor 29 drives connecting plate 19 rotatory, connecting plate 19 mixes the inside water and sanitizer of press box 5 and washs press box 5 inside, after the washing, open valve 4, the waste liquid after the cleaning is discharged from connecting tube 3, guarantee to wash press box 5 inside everywhere.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a hand-held type berry processing apparatus that squeezes juice, includes bottom plate (1), its characterized in that: the pipe jacking device is characterized in that a squeezing box (5) is fixedly connected with a pipe jacking of the bottom plate (1), positioning sleeves (2) are fixedly connected with the two sides of the squeezing box (5), a powerful motor (24) is fixedly connected with the inside of the positioning sleeves (2), one end of an output shaft of the powerful motor (24) is fixedly connected with a third electric telescopic rod (25), a sealing plate (26) is movably connected with the outer side of one end of a piston rod of the third electric telescopic rod (25), a crushing device (27) is fixedly connected with one end of a piston rod of the third electric telescopic rod (25), a filtering plate (13) is fixedly connected with the bottom end inside the squeezing box (5), a connecting pipeline (3) is fixedly connected with one end of the squeezing box (5), a valve (4) is arranged at one end of the connecting pipeline (3) far away from the squeezing box (5), and a hand-holding sleeve (6) is fixedly connected with the outer side of the middle of the squeezing box (5), the top end of the squeezing box (5) is fixedly connected with a sealing collar (14), the top end of the outer side of the squeezing box (5) is fixedly connected with a bearing frame (8), the top end of the bearing frame (8) is fixedly connected with a first electric telescopic rod (7), the top end of the first electric telescopic rod (7) is fixedly connected with a connecting seat (9), one end, far away from the first electric telescopic rod (7), of the connecting seat (9) is fixedly connected with a sealing cover (10), the middle part of the top end of the sealing cover (10) is fixedly connected with an electric power supply device (11), both sides of the top end of the sealing cover (10) are provided with air holes (12), the middle part of the top end of the inner side of the sealing cover (10) is fixedly connected with an electric power adjusting base (28), the inside of the electric power adjusting base (28) is fixedly connected with a first motor (29), and the bottom end of the first motor (29) is rotatably connected with a harmonic speed reducer (15), the bottom end of the harmonic reducer (15) is rotatably connected with a second electric telescopic rod (16), two ends of the outer side of a piston rod of the second electric telescopic rod (16) are fixedly connected with connecting plates (19), a bottom end of each connecting plate (19) is fixedly connected with a ventilation plate (22), two sides of each ventilation plate (22) are respectively provided with a second positioning hole (23), a protection shell (20) is fixedly connected to the bottom end of the piston rod of the second electric telescopic rod (16), a second motor (21) is fixedly connected to the inner portion of the protection shell (20), a grinding ventilation disc (17) is fixedly connected to one end of an output shaft of the second motor (21), and first positioning holes (18) are respectively arranged on two inner sides of the grinding ventilation disc (17).

2. A hand-held berry juicing device as claimed in claim 1, wherein: the two positioning sleeves (2) are symmetrically distributed on two sides of the squeezing box (5).

3. A hand-held berry juicing device as claimed in claim 1, wherein: the sealing plate (26) has two, two sealing plates (26) are symmetrically distributed in the positioning sleeve (2), and the diameters of the two sealing plates (26) are equal to the inner diameter of the positioning sleeve (2).

4. The hand-held berry juicing device according to claim 1, wherein: the central line of the bearing frame (8) and the central line of the press box (5) are in the same straight line, and the inner diameter of the bearing frame (8) is equal to the outer diameter of the press box (5).

5. A hand-held berry juicing device as claimed in claim 1, wherein: the number of the first electric telescopic rods (7) is four, and the four first electric telescopic rods (7) are distributed on the top end of the bearing frame (8) in an equidistant annular array mode.

6. A hand-held berry juicing device as claimed in claim 1, wherein: the number of the connecting plates (19) is two, and the two connecting plates (19) are symmetrically distributed at the top end of the ventilating plate (22).

7. The hand-held berry juicing device according to claim 1, wherein: the diameter of the grinding air-permeable disc (17) is equal to the inner diameter of the press box (5), and the central line of the grinding air-permeable disc (17) and the central line of the second motor (21) are the same straight line.

8. A hand-held berry juicing device as claimed in claim 1, wherein: the number of the first positioning holes (18) and the number of the second positioning holes (23) are two, the two first positioning holes (18) are symmetrically distributed in the grinding ventilation disc (17), the two second positioning holes (23) are symmetrically distributed in the ventilation plate (22), and the center distance between the two first positioning holes (18) is equal to the center distance between the two second positioning holes (23).