White corundum particle screening equipment

Abstract

The utility model relates to the technical field of white corundum particle screening, in particular to white corundum particle screening equipment which is characterized in that white corundum particles are poured into a screening mechanism, the white corundum particles are classified and screened through the screening mechanism, and meanwhile, the white corundum particles clamped in meshes are cleaned through a cleaning mechanism. Meanwhile, dust in the white corundum particles is blown up, and the blown dust is collected through the recovery mechanism, so that the practicability of the equipment is improved; comprising a screening mechanism; the device further comprises a cleaning mechanism and a recycling mechanism, and the cleaning mechanism and the recycling mechanism are both installed on the screening mechanism. The screening mechanism is used for screening white corundum particles, the cleaning mechanism is used for cleaning the white corundum particles clamped in meshes, and the recovery mechanism is used for collecting dust in the white corundum particles.

Description

Technical Field

[0001] The utility model relates to the technical field of white corundum particle screening, in particular to a white corundum particle screening device. Background Art

[0002] White corundum is a man-made abrasive with an aluminum oxide content of more than 99% and a small amount of iron oxide, silicon oxide and other ingredients. It is white in color. Since the particle sizes of the refined white corundum particles are often different, screening is required.

[0003] Generally, white corundum particles are screened by using a closed and environmentally friendly white corundum particle screening device disclosed in the utility model patent with application number 202021445146.4 and a white corundum screening device with uniform feeding disclosed in the utility model patent with application number 202120000280.1.

[0004] However, it was found during the screening process that the existing screening equipment is not convenient for collecting dust in the white corundum particles, and the white corundum particles with a size similar to the mesh size are easy to clog the mesh during the screening process, affecting the normal operation of the equipment, resulting in poor practicality. Therefore, a white corundum particle screening equipment is urgently needed to improve the above problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a white corundum particle screening device which pours white corundum particles into a screening mechanism, performs graded screening on the white corundum particles through the screening mechanism, cleans the white corundum particles stuck in the mesh through a cleaning mechanism, blows up the dust in the white corundum particles, and collects the blown-up dust through a recovery mechanism, thereby improving the practicability of the device.

[0006] The utility model discloses a white corundum particle screening device, comprising a screening mechanism, a cleaning mechanism and a recovery mechanism, both of which are installed on the screening mechanism;

[0007] The screening mechanism screens the white corundum particles, the cleaning mechanism cleans the white corundum particles stuck in the mesh, and the recovery mechanism collects the dust in the white corundum particles;

[0008] The white corundum particles are poured into the screening mechanism, and the white corundum particles are graded and screened by the screening mechanism. At the same time, the white corundum particles stuck in the mesh are cleaned by the cleaning mechanism, and the dust in the white corundum particles is blown up, and the blown dust is collected by the recovery mechanism, thereby improving the practicability of the equipment.

[0009] Preferably, the screening mechanism comprises a screening box, multiple groups of screens, multiple groups of vibration motors, multiple groups of storage boxes, multiple groups of discharge plates and a feeding mechanism, the feeding mechanism is installed at the top of the screening box, the multiple groups of screens and the multiple groups of vibration motors are installed in the screening box, and the right end of the screening box is provided with multiple groups of discharge ports, the multiple groups of storage boxes are installed at the right end of the screening box, and the multiple groups of discharge ports at the right end of the screening box are respectively communicated with the interior of the multiple groups of storage boxes, and the multiple groups of discharge plates are respectively slidably installed on the multiple groups of storage boxes; the white corundum particles are uniformly discharged into the interior of the screening box through the feeding mechanism, the multiple groups of vibration motors are turned on to vibrate the multiple groups of screens, the white corundum particles are graded and screened through the multiple groups of screens, and the white corundum particles with smaller particle sizes fall to the bottom of the screening box, and the white corundum particles screened out by the multiple groups of screens are stored by the multiple groups of storage boxes, then the discharge plates are opened to discharge the white corundum particles in the storage box, and the screening box is opened to take out the white corundum particles at the bottom of the screening box, thereby improving the practicability of the equipment.

[0010] Preferably, the feeding mechanism includes a conveying box, a driving motor and a spiral conveying shaft, the bottom end of the conveying box is connected to the top end of the screening box, the top end of the conveying box is provided with a feeding port, the bottom end of the conveying box is provided with a discharging port, and the discharging port of the conveying box is communicated with the interior of the screen, the driving motor is installed on the conveying box, one end of the spiral conveying shaft is installed on the output shaft of the driving motor, and the other end of the spiral conveying shaft extends to the interior of the conveying box; the white corundum particles are discharged into the conveying box, the driving motor is turned on, and the spiral conveying shaft is driven to rotate, so that the spiral conveying shaft evenly discharges the white corundum particles in the conveying box to the interior of the screening box, thereby improving the practicability of the equipment.

[0011] Preferably, the cleaning mechanism comprises a plurality of support frames, a plurality of rollers, a plurality of air pipes, a plurality of first nozzles, a plurality of second nozzles and a plurality of driving devices; a plurality of guide grooves are arranged at the front and rear ends of the screening box; a plurality of rollers are rotatably mounted at the front and rear ends of the plurality of support frames, and the plurality of rollers are respectively located in the plurality of guide grooves at the front and rear ends of the screening box; a plurality of air pipes are respectively mounted on the plurality of support frames; a plurality of first nozzles are respectively mounted at the top ends of the plurality of support frames; a plurality of second nozzles are respectively mounted at the front and rear ends of the plurality of support frames; and a plurality of driving devices are all mounted on the screening box. ; Connect the air pipe to the air compression equipment, provide power to the support frame through the driving device, make the multiple groups of rollers roll in the multiple groups of guide grooves at the front end and the rear end of the screening box respectively, move the position of the support frame, blow air to the screen through the multiple groups of first nozzles, blow out the white corundum particles stuck in the mesh of the screen, and at the same time, blow up the dust in the screening box through the air sprayed into the screening box, and blow air to the multiple groups of guide grooves at the front end and the rear end of the screening box through the multiple groups of second nozzles, blow out the white corundum particles in the multiple groups of guide grooves at the front end and the rear end of the screening box, thereby improving the practicality of the equipment.

[0012] Preferably, the driving device includes two groups of hydraulic cylinders, two groups of first permanent magnets, two groups of supporting wheels and two groups of second permanent magnets, the two groups of hydraulic cylinders are respectively installed at the front end and the rear end of the screening box, the two groups of first permanent magnets are respectively installed on one end of the two groups of hydraulic cylinders, the two groups of supporting wheels are respectively installed on the two groups of first permanent magnets, and the two groups of supporting wheels support the two groups of first permanent magnets respectively, and the two groups of second permanent magnets are respectively installed at the front end and the rear end of the support frame; the two groups of second permanent magnets are respectively attracted by the two groups of first permanent magnets, and then the two groups of hydraulic cylinders are extended or contracted to make the multiple groups of rollers roll in the multiple groups of guide grooves at the front end and the rear end of the screening box, and the position of the support frame is adjusted, and at the same time, the two groups of supporting wheels are respectively rolled at the front end and the rear end of the screening box to support the two groups of first permanent magnets, so as to maintain the stability of the two groups of first permanent magnets, thereby improving the practicality of the equipment.

[0013] Preferably, the recycling mechanism includes a recycling box, an air intake pipe, multiple groups of filters and an exhaust pump. The bottom end of the recycling box is connected to the top end of the screening box. The air intake pipe is installed inside the recycling box, and the bottom end of the air intake pipe is communicated with the inside of the screening box. Multiple groups of filters are installed inside the recycling box. The exhaust pump is installed on the recycling box, and the air intake of the exhaust pump is communicated with the inside of the recycling box. Turn on the exhaust pump to discharge the air in the recycling box, so that the air intake pipe sucks the dust in the screening box into the recycling box, and filters the dust in the recycling box through the filter, thereby improving the practicality of the equipment.

[0014] Preferably, it also includes a one-way valve, which is rotatably installed on the top of the air inlet pipe; when the dust in the screening box is discharged into the recovery box through the air inlet pipe, the dust is blocked by the one-way valve to reduce the flow rate of the dust, and when the dust in the recovery box is cleaned, the one-way valve seals the top of the air inlet pipe to reduce the dust falling into the air inlet pipe, thereby improving the practicability of the equipment.

[0015] Compared with the prior art, the utility model has the following beneficial effects: white corundum particles are poured into a screening mechanism, the white corundum particles are graded and screened by the screening mechanism, the white corundum particles stuck in the mesh are cleaned by a cleaning mechanism, the dust in the white corundum particles is blown up, and the blown up dust is collected by a recovery mechanism, thereby improving the practicability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the axonometric structure of the utility model;

[0017] Figure 2 It is a front view structural schematic diagram of the utility model;

[0018] Figure 3 It is a front view cross-sectional structural schematic diagram of the utility model;

[0019] Figure 4 It is an axonometric enlarged schematic diagram of the structure of the support frame, rollers and gas pipe of the utility model;

[0020] Figure 5 It is an axonometric enlarged structural schematic diagram of the drive device of the utility model;

[0021] Figure 6 This utility model Figure 3 Schematic diagram of the enlarged structure of part A in FIG.

[0022] Markings in the attached figure: 1. screening box; 2. screen; 3. vibration motor; 4. storage box; 5. discharge plate; 6. conveying box; 7. driving motor; 8. screw conveyor shaft; 9. support frame; 10. roller; 11. air pipe; 12. first nozzle; 13. second nozzle; 14. hydraulic cylinder; 15. first permanent magnet; 16. support wheel; 17. second permanent magnet; 18. recovery box; 19. air inlet pipe; 20. filter; 21. exhaust pump; 22. one-way valve. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0024] Example 1

[0025] It includes a screening mechanism; it also includes a cleaning mechanism and a recycling mechanism, and the cleaning mechanism and the recycling mechanism are both installed on the screening mechanism;

[0026] The screening mechanism screens the white corundum particles, the cleaning mechanism cleans the white corundum particles stuck in the mesh, and the recovery mechanism collects the dust in the white corundum particles;

[0027] The screening mechanism comprises a screening box 1, multiple groups of screens 2, multiple groups of vibration motors 3, multiple groups of storage boxes 4, multiple groups of discharge plates 5 and a feeding mechanism, wherein the feeding mechanism is installed at the top of the screening box 1, the multiple groups of screens 2 and the multiple groups of vibration motors 3 are installed in the screening box 1, and the right end of the screening box 1 is provided with multiple groups of discharge ports, the multiple groups of storage boxes 4 are installed at the right end of the screening box 1, and the multiple groups of discharge ports at the right end of the screening box 1 are respectively communicated with the interior of the multiple groups of storage boxes 4, and the multiple groups of discharge plates 5 are respectively slidably installed on the multiple groups of storage boxes 4;

[0028] The feeding mechanism includes a conveying box 6, a driving motor 7 and a screw conveying shaft 8. The bottom end of the conveying box 6 is connected to the top end of the screening box 1. The top end of the conveying box 6 is provided with a feeding port, the bottom end of the conveying box 6 is provided with a discharging port, and the discharging port of the conveying box 6 is communicated with the inside of the screen 2. The driving motor 7 is installed on the conveying box 6, one end of the screw conveying shaft 8 is installed on the output shaft of the driving motor 7, and the other end of the screw conveying shaft 8 extends to the inside of the conveying box 6;

[0029] The cleaning mechanism includes multiple groups of support frames 9, multiple groups of rollers 10, multiple groups of air pipes 11, multiple groups of first nozzles 12, multiple groups of second nozzles 13 and multiple groups of driving devices. Multiple groups of guide grooves are provided at the front and rear ends of the screening box 1. Multiple groups of rollers 10 are rotatably installed at the front and rear ends of the multiple groups of support frames 9, and the multiple groups of rollers 10 are respectively located in the multiple groups of guide grooves at the front and rear ends of the screening box 1. Multiple groups of air pipes 11 are respectively installed on the multiple groups of support frames 9, multiple groups of first nozzles 12 are respectively installed at the top ends of the multiple groups of support frames 9, multiple groups of second nozzles 13 are respectively installed at the front and rear ends of the multiple groups of support frames 9, and multiple groups of driving devices are all installed on the screening box 1.

[0030] The driving device includes two groups of hydraulic cylinders 14, two groups of first permanent magnets 15, two groups of supporting wheels 16 and two groups of second permanent magnets 17. The two groups of hydraulic cylinders 14 are respectively installed at the front end and the rear end of the screening box 1. The two groups of first permanent magnets 15 are respectively installed on one end of the two groups of hydraulic cylinders 14. The two groups of supporting wheels 16 are respectively installed on the two groups of first permanent magnets 15, and the two groups of supporting wheels 16 support the two groups of first permanent magnets 15 respectively. The two groups of second permanent magnets 17 are respectively installed at the front end and the rear end of the support frame 9.

[0031] The white corundum particles are discharged into the conveying box 6, and the driving motor 7 is turned on to drive the spiral conveying shaft 8 to rotate, so that the spiral conveying shaft 8 evenly discharges the white corundum particles in the conveying box 6 to the inside of the screening box 1, so that the multiple groups of screens 2 perform graded screening on the white corundum particles. At the same time, the two groups of first permanent magnets 15 respectively attract the two groups of second permanent magnets 17, and then the two groups of hydraulic cylinders 14 are extended or contracted to make the multiple groups of rollers 10 roll in the multiple groups of guide grooves at the front and rear ends of the screening box 1 respectively, and the position of the support frame 9 is adjusted. The air is blown to the screen 2 through the multiple groups of first nozzles 12 to blow the white corundum particles stuck in the mesh of the screen 2. The particles are blown out, and the dust in the screening box 1 is blown up by the air sprayed into the screening box 1, and the air is blown to the multiple groups of guide grooves at the front end and the rear end of the screening box 1 through the multiple groups of second nozzles 13, so that the white corundum particles in the multiple groups of guide grooves at the front end and the rear end of the screening box 1 are blown out, and the white corundum particles with smaller particle sizes fall to the bottom of the screening box 1, and the white corundum particles screened by the multiple groups of screens 2 are stored by the multiple groups of storage boxes 4, and then the discharge plate 5 is opened to discharge the white corundum particles in the storage box 4, and then the screening box 1 is opened to take out the white corundum particles at the bottom of the screening box 1, thereby improving the practicability of the equipment.

[0032] Example 2

[0033] like Figures 1 to 6 As shown, it includes a screening mechanism; it also includes a cleaning mechanism and a recycling mechanism, and the cleaning mechanism and the recycling mechanism are both installed on the screening mechanism;

[0034] The screening mechanism screens the white corundum particles, the cleaning mechanism cleans the white corundum particles stuck in the mesh, and the recovery mechanism collects the dust in the white corundum particles;

[0035] The screening mechanism comprises a screening box 1, multiple groups of screens 2, multiple groups of vibration motors 3, multiple groups of storage boxes 4, multiple groups of discharge plates 5 and a feeding mechanism, wherein the feeding mechanism is installed at the top of the screening box 1, the multiple groups of screens 2 and the multiple groups of vibration motors 3 are installed in the screening box 1, and the right end of the screening box 1 is provided with multiple groups of discharge ports, the multiple groups of storage boxes 4 are installed at the right end of the screening box 1, and the multiple groups of discharge ports at the right end of the screening box 1 are respectively communicated with the interior of the multiple groups of storage boxes 4, and the multiple groups of discharge plates 5 are respectively slidably installed on the multiple groups of storage boxes 4;

[0036] The feeding mechanism includes a conveying box 6, a driving motor 7 and a screw conveying shaft 8. The bottom end of the conveying box 6 is connected to the top end of the screening box 1. The top end of the conveying box 6 is provided with a feeding port, the bottom end of the conveying box 6 is provided with a discharging port, and the discharging port of the conveying box 6 is communicated with the inside of the screen 2. The driving motor 7 is installed on the conveying box 6, one end of the screw conveying shaft 8 is installed on the output shaft of the driving motor 7, and the other end of the screw conveying shaft 8 extends to the inside of the conveying box 6;

[0037] The cleaning mechanism includes multiple groups of support frames 9, multiple groups of rollers 10, multiple groups of air pipes 11, multiple groups of first nozzles 12, multiple groups of second nozzles 13 and multiple groups of driving devices. Multiple groups of guide grooves are provided at the front and rear ends of the screening box 1. Multiple groups of rollers 10 are rotatably installed at the front and rear ends of the multiple groups of support frames 9, and the multiple groups of rollers 10 are respectively located in the multiple groups of guide grooves at the front and rear ends of the screening box 1. Multiple groups of air pipes 11 are respectively installed on the multiple groups of support frames 9, multiple groups of first nozzles 12 are respectively installed at the top ends of the multiple groups of support frames 9, multiple groups of second nozzles 13 are respectively installed at the front and rear ends of the multiple groups of support frames 9, and multiple groups of driving devices are all installed on the screening box 1.

[0038] The driving device includes two groups of hydraulic cylinders 14, two groups of first permanent magnets 15, two groups of supporting wheels 16 and two groups of second permanent magnets 17. The two groups of hydraulic cylinders 14 are respectively installed at the front end and the rear end of the screening box 1. The two groups of first permanent magnets 15 are respectively installed on one end of the two groups of hydraulic cylinders 14. The two groups of supporting wheels 16 are respectively installed on the two groups of first permanent magnets 15, and the two groups of supporting wheels 16 support the two groups of first permanent magnets 15 respectively. The two groups of second permanent magnets 17 are respectively installed at the front end and the rear end of the support frame 9.

[0039] The recycling mechanism includes a recycling box 18, an air intake pipe 19, a plurality of filter screens 20 and an exhaust pump 21. The bottom end of the recycling box 18 is connected to the top end of the screening box 1. The air intake pipe 19 is installed inside the recycling box 18, and the bottom end of the air intake pipe 19 is communicated with the inside of the screening box 1. The plurality of filter screens 20 are installed inside the recycling box 18. The exhaust pump 21 is installed on the recycling box 18, and the air intake port of the exhaust pump 21 is communicated with the inside of the recycling box 18.

[0040] It also includes a one-way valve 22, which is rotatably mounted on the top end of the intake pipe 19;

[0041] The white corundum particles are discharged into the conveying box 6, and the driving motor 7 is turned on to drive the spiral conveying shaft 8 to rotate, so that the spiral conveying shaft 8 evenly discharges the white corundum particles in the conveying box 6 to the inside of the screening box 1, so that the multiple groups of screens 2 perform graded screening on the white corundum particles, and at the same time, the two groups of first permanent magnets 15 respectively attract the two groups of second permanent magnets 17, and then the two groups of hydraulic cylinders 14 are extended or contracted to make the multiple groups of rollers 10 roll in the multiple groups of guide grooves at the front and rear ends of the screening box 1 respectively, and the position of the support frame 9 is adjusted, and the air is blown to the screen 2 through the multiple groups of first nozzles 12 to blow out the white corundum particles stuck in the mesh of the screen 2, and at the same time, the dust in the screening box 1 is blown up by the air sprayed into the screening box 1, and then the exhaust pump 21 is turned on to recycle The air in the box 18 is discharged, and the one-way valve 22 is opened, so that the air inlet pipe 19 sucks the dust in the screening box 1 into the recovery box 18, and the dust in the recovery box 18 is filtered through the filter screen 20 to complete the collection of dust, and the air is blown to the multiple groups of guide grooves at the front end and the rear end of the screening box 1 through the multiple groups of second nozzles 13, and the white corundum particles in the multiple groups of guide grooves at the front end and the rear end of the screening box 1 are blown out, and the white corundum particles with smaller particle sizes fall to the bottom of the screening box 1, and the white corundum particles screened by the multiple groups of screens 2 are stored by the multiple groups of storage boxes 4 respectively, and then the discharge plate 5 is opened to discharge the white corundum particles in the storage box 4, and then the screening box 1 is opened to take out the white corundum particles at the bottom of the screening box 1, thereby improving the practicality of the equipment.

[0042] The vibration motor 3, the drive motor 7, the hydraulic cylinder 14, the first permanent magnet block 15, the second permanent magnet block 17 and the exhaust pump 21 of the white corundum particle screening equipment of the utility model are purchased on the market. The technicians in the industry only need to install and operate them according to the accompanying instruction manual, and the technicians in this field do not need to make creative labor.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A white corundum particle screening device, comprising a screening mechanism; characterized in that: It also includes a cleaning mechanism and a recycling mechanism, both of which are installed on the screening mechanism; The screening mechanism screens the white corundum particles, the cleaning mechanism cleans the white corundum particles stuck in the mesh, and the recovery mechanism collects the dust in the white corundum particles.

2. A white corundum particle screening device as claimed in claim 1, characterized in that: The screening mechanism comprises a screening box (1), a plurality of screen mesh groups (2), a plurality of vibration motor groups (3), a plurality of storage boxes (4), a plurality of discharge plates (5) and a feeding mechanism, wherein the feeding mechanism is installed at the top of the screening box (1), the plurality of screen mesh groups (2) and the plurality of vibration motor groups (3) are installed in the screening box (1), and a plurality of discharge ports are arranged at the right end of the screening box (1), the plurality of storage boxes (4) are installed at the right end of the screening box (1), and the plurality of discharge ports at the right end of the screening box (1) are respectively communicated with the interior of the plurality of storage boxes (4), and the plurality of discharge plates (5) are respectively slidably installed on the plurality of storage boxes (4).

3. A white corundum particle screening device as claimed in claim 2, characterized in that: The feeding mechanism comprises a conveying box (6), a driving motor (7) and a screw conveying shaft (8); the bottom end of the conveying box (6) is connected to the top end of the screening box (1); the top end of the conveying box (6) is provided with a feeding port; the bottom end of the conveying box (6) is provided with a discharging port; and the discharging port of the conveying box (6) is communicated with the interior of the screen (2); the driving motor (7) is mounted on the conveying box (6); one end of the screw conveying shaft (8) is mounted on the output shaft of the driving motor (7); and the other end of the screw conveying shaft (8) extends to the interior of the conveying box (6).

4. A white corundum particle screening device as claimed in claim 2, characterized in that: The cleaning mechanism comprises a plurality of support frames (9), a plurality of rollers (10), a plurality of air pipes (11), a plurality of first nozzles (12), a plurality of second nozzles (13) and a plurality of driving devices. A plurality of guide grooves are arranged at the front and rear ends of the screening box (1). The plurality of rollers (10) are rotatably mounted at the front and rear ends of the plurality of support frames (9), and the plurality of rollers (10) are respectively located in the plurality of guide grooves at the front and rear ends of the screening box (1). The plurality of air pipes (11) are respectively mounted on the plurality of support frames (9). The plurality of first nozzles (12) are respectively mounted at the top ends of the plurality of support frames (9). The plurality of second nozzles (13) are respectively mounted at the front and rear ends of the plurality of support frames (9). The plurality of driving devices are all mounted on the screening box (1).

5. A white corundum particle screening device as claimed in claim 4, characterized in that: The driving device comprises two groups of hydraulic cylinders (14), two groups of first permanent magnets (15), two groups of supporting wheels (16) and two groups of second permanent magnets (17); the two groups of hydraulic cylinders (14) are respectively mounted at the front end and the rear end of the screening box (1); the two groups of first permanent magnets (15) are respectively mounted on one end of the two groups of hydraulic cylinders (14); the two groups of supporting wheels (16) are respectively mounted on the two groups of first permanent magnets (15); and the two groups of supporting wheels (16) respectively support the two groups of first permanent magnets (15); and the two groups of second permanent magnets (17) are respectively mounted at the front end and the rear end of the supporting frame (9).

6. A white corundum particle screening device as claimed in claim 2, characterized in that: The recovery mechanism comprises a recovery box (18), an air intake pipe (19), a plurality of groups of filter screens (20) and an exhaust pump (21); the bottom end of the recovery box (18) is connected to the top end of the screening box (1); the air intake pipe (19) is installed inside the recovery box (18), and the bottom end of the air intake pipe (19) is communicated with the inside of the screening box (1); the plurality of groups of filter screens (20) are installed inside the recovery box (18); the exhaust pump (21) is installed on the recovery box (18), and the air intake port of the exhaust pump (21) is communicated with the inside of the recovery box (18).

7. A white corundum particle screening device as claimed in claim 6, characterized in that: The invention also comprises a one-way valve (22), which is rotatably mounted on the top end of the air inlet pipe (19).

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