Synthetic quartz crushing and screening equipment

Abstract

The utility model provides synthetic quartz crushing and screening equipment, which relates to the technical field of high-purity quartz crushing and grading and comprises a filter box, and a second water pump is arranged on one side of the filter box. According to the quartz particle screening device, during screening, a worker starts a second water pump, the second water pump introduces water and quartz particles into a first filter cartridge, a first motor is started, a first gear and a second gear rotate anticlockwise, and a part of the first filter cartridge is immersed in water in a filter box and rotates along with the first filter cartridge; quartz particles are attached to the cylinder wall and rotate to a spraying position, a high-pressure water pump is started, high-pressure water is sprayed out of a spraying head and crushed through the high-pressure water, meanwhile, a PE baffle is arranged outside the cylinder at the water impact position, the crushing effect is improved, the cylinder continues to rotate, and the crushed particles enter the position below the water level; and particles with small particle sizes after crushing enter the filter box through the fixed aperture of the first filter cartridge under the action of gravity, and the crushing process has no pollution and no dust on the materials.

Description

Technical Field

[0001] The utility model relates to the technical field of high-purity quartz crushing and grading, in particular to synthetic quartz crushing and screening equipment. Background Art

[0002] Crushing and grading is an important part of the production process of quartz sand. Usually, mechanical crushing and grading equipment is used to crush large particles into smaller particles by extrusion, grinding, hammering, etc., and then grading them according to different particle sizes through screening equipment (such as linear screens: rotary vibrating screens, etc.). Due to the high hardness of the ore, high-strength metal equipment must be used in the crushing process. The crushing and grading process seriously pollutes the materials, and the crushing and grading process is very dusty. It not only affects the product quality, but also causes great pollution to the production and living environment.

[0003] High-purity quartz is a type of quartz material with extremely high purity, so the preparation process has extremely high purity requirements. Both natural high-purity quartz and artificially synthesized high-purity quartz need to be crushed and graded to a suitable particle size range according to the use requirements. The preparation of natural high-purity quartz usually uses the method of crushing and grading and then pickling to remove impurities, and synthetic quartz basically adopts a similar method. The above treatment method also has a series of problems such as dust pollution, large amount of acid, large amount of waste acid treatment, complex process, and high cost. Utility Model Content

[0004] The utility model aims to solve a series of problems in the prior art, such as dust pollution, large amount of acid used, large amount of waste acid to be treated, complex process, high cost, etc., and proposes a synthetic quartz crushing and screening equipment.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a synthetic quartz crushing and screening equipment, including a filter box, a second water pump is arranged on one side of the filter box, an input end of the second water pump is fixedly connected with a connecting pipe, an output end of the second water pump is fixedly connected with a first water inlet pipe, one end of the first water inlet pipe passes through the filter box and a first fixed plate is fixedly installed on the outer wall, a first motor is fixedly installed on one end of the filter box away from the first water inlet pipe, an output end of the first motor passes through the filter box and a first gear is fixedly installed, a first filter cartridge is rotatably installed on the inner wall of the filter box, a second gear is fixedly installed on the outer wall of the first filter cartridge, the first gear is meshingly connected with the second gear, a water tank is fixedly installed on the outer wall of the filter box, a high-pressure water pump is arranged on one side of the filter box, the water tank and the input end of the high-pressure water pump are fixedly connected through a water pipe, and a fixed pipe is fixedly installed on the output end of the high-pressure water pump; one end of the fixed pipe passes through the first fixed plate, a plurality of evenly distributed spray heads are installed on the outer wall of the fixed pipe, a PE baffle is fixedly installed on the outer wall of the first filter cartridge, and a first water outlet pipe is installed on the outer wall of the filter box.

[0006] Preferably, a first water pump is arranged on one side of the filter box, the input end of the first water pump is fixedly connected to the first water outlet pipe, the output end of the first water pump is fixedly installed with a second water inlet pipe, a microfilter is arranged on one side of the first water pump, one end of the second water inlet pipe passes through the microfilter and a second fixing plate is fixedly installed on the outer wall.

[0007] Preferably, a second motor is fixedly installed at one end of the microfilter, the output end of the second motor passes through the microfilter and is fixedly installed with a third gear, a second filter cartridge is rotatably installed on the inner wall of the microfilter, a fourth gear is fixedly installed on the outer wall of the second filter cartridge, the third gear is meshingly connected with the fourth gear, and the second filter cartridge is fitted with the second fixed plate on one side close to the second fixed plate.

[0008] Preferably, a high-pressure cleaning water pump is fixedly installed inside the microfiltration machine, a support pipe is fixedly installed at the output end of the high-pressure cleaning water pump, and a plurality of evenly distributed high-pressure nozzles are fixedly installed on the outer wall of the support pipe.

[0009] Preferably, a second water outlet pipe is installed through one end of the microfilter, a second sewage pipe is installed through one end of the microfilter, a second solenoid valve is provided on the outer wall of the second sewage pipe, and a first sewage pipe is installed through one end of the filter box, and a first solenoid valve is provided on the outer wall of the first sewage pipe.

[0010] Preferably, an operating tank is arranged on one side of the first water pump, a first electric heating plate and a cooling plate are fixedly mounted on the outer wall of the operating tank, a U-shaped plate is fixedly mounted on the outer wall of the operating tank, an electric telescopic rod is fixedly mounted on the outer wall of the U-shaped plate, a partition is penetrated and installed inside the operating tank, the telescopic end of the electric telescopic rod penetrates the U-shaped plate and is slidably connected to the partition, and a feed pipe is penetrated and installed on the top of the operating tank.

[0011] Preferably, a support plate is fixedly installed on the outer wall of the cooling plate, a cooling box is fixedly installed on the top of the support plate, a cooling water pump is fixedly installed on the top of the support plate, the input end of the cooling water pump is fixedly connected to the cooling box through a water pipe, and a cooling pipe is fixedly connected between the output end of the cooling water pump and the cooling plate.

[0012] Preferably, a drying box is arranged at one end of the microfilter near the second sewage pipe, a drainage pipe is installed through the bottom of the drying box, a filter plate is fixedly installed inside the drying box, a box door is hinged at the top of the drying box, and a second electric heating plate is fixedly installed on the outer wall of the drying box.

[0013] Preferably, the outer walls of the second motor and the first motor are respectively sleeved with a second waterproof box and a first waterproof box.

[0014] Compared with the prior art, the advantages and positive effects of the utility model are:

[0015] 1. In the utility model, during screening, the staff starts the second water pump, and the second water pump passes water and quartz particles into the first filter cartridge, starts the first motor, and the first gear rotates, driving the second gear to rotate counterclockwise. A part of the first filter cartridge is immersed in the water inside the filter box. As the first filter cartridge rotates, the quartz particles adhere to the cylinder wall and rotate to the spray position. The high-pressure water pump is started, and the high-pressure water enters the fixed pipe and is sprayed out from the spray head. The high-pressure water is used to crush the particles. At the same time, a PE baffle is set outside the cylinder at the water impact position to increase the crushing effect. The cylinder continues to rotate, and the crushed particles enter below the water level. After crushing, the particles with smaller particle size enter the filter box through the fixed aperture of the first filter cartridge by gravity. At this time, the crushing and screening can be completed, and the crushing process is pollution-free and dust-free to the material.

[0016] 2. In the utility model, after the first screening is completed, the staff starts the second water pump, the screened particles enter the first water outlet pipe, and finally enter the second filter cartridge, the second motor is started, the third gear and the fourth gear rotate, the particles smaller than microns leave the second filter cartridge, and then the second solenoid valve is opened, the particles leave the microfilter, at the same time, the high-pressure cleaning water pump is started, water flows from the high-pressure nozzle to the second filter cartridge, and the particles adsorbed on the inner wall of the second filter cartridge are sprayed off, so that further screening can be completed, thereby improving the accuracy of screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model provides an overall stereogram of a synthetic quartz crushing and screening device;

[0018] Figure 2 A three-dimensional diagram of a filter box for a synthetic quartz crushing and screening device is provided for the utility model;

[0019] Figure 3 This is a three-dimensional diagram of the interior of the first filter cartridge of a synthetic quartz crushing and screening device proposed by the utility model;

[0020] Figure 4 A stereoscopic diagram of a microfilter for a synthetic quartz crushing and screening device is provided for the utility model;

[0021] Figure 5 A stereoscopic view of a microfilter of a synthetic quartz crushing and screening device proposed in the utility model from another perspective;

[0022] Figure 6 A three-dimensional diagram of the operating tank of a synthetic quartz crushing and screening device is proposed for the utility model;

[0023] Figure 7 The utility model provides a three-dimensional diagram of a drying box for synthetic quartz crushing and screening equipment.

[0024] Legend: 1. Filter box; 2. Microfilter; 3. Drying box; 4. Box door; 5. First sewage pipe; 6. First solenoid valve; 7. Operation tank; 8. First water pump; 9. First motor; 10. First gear; 11. Second gear; 12. First filter cartridge; 13. Second water pump; 14. First water inlet pipe; 15. Connecting pipe; 16. High-pressure water pump; 17. Fixed pipe; 18. Water tank; 19. First water outlet pipe; 20. First fixed plate; 21. First waterproof box; 22. PE baffle; 23. Sprinkler head; 24. Second water inlet pipe; 25. Support pipe; 26. High-pressure nozzle; 27. Second waterproof box; 28. Second motor; 29. ​​Third gear; 30. Fourth gear; 31. Second filter cartridge; 32. High-pressure cleaning water pump; 33. Second fixed plate; 34. Second water outlet pipe; 35. Second sewage pipe; 36. Second solenoid valve; 37. Feed pipe; 38. First electric heating plate; 39. Partition; 40. U-shaped plate; 41. Electric telescopic rod; 42. Cooling plate; 43. Support plate; 44. Cooling box; 45. Cooling water pump; 46. Cooling pipe; 47. Drain pipe; 48. Filter plate; 49. Second electric heating plate. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0027] Embodiment 1, as Figure 1-Figure 7As shown, the utility model provides a synthetic quartz crushing and screening device, including a filter box 1, a second water pump 13 is arranged on one side of the filter box 1, an input end of the second water pump 13 is fixedly connected to a connecting pipe 15, an output end of the second water pump 13 is fixedly connected to a first water inlet pipe 14, one end of the first water inlet pipe 14 passes through the filter box 1 and a first fixing plate 20 is fixedly installed on the outer wall, a first motor 9 is fixedly installed on the end of the filter box 1 away from the first water inlet pipe 14, an output end of the first motor 9 passes through the filter box 1 and a first gear 10 is fixedly installed, a first filter cartridge 12 is rotatably installed on the inner wall of the filter box 1, and the first gear 10 is fixedly installed on the outer wall of the filter box 1. A second gear 11 is fixedly installed on the outer wall of a filter cartridge 12, the first gear 10 is meshed with the second gear 11, a water tank 18 is fixedly installed on the outer wall of the filter box 1, a high-pressure water pump 16 is arranged on one side of the filter box 1, the water tank 18 is fixedly connected to the input end of the high-pressure water pump 16 through a water pipe, and a fixed pipe 17 is fixedly installed on the output end of the high-pressure water pump 16; one end of the fixed pipe 17 passes through the first fixed plate 20, and a plurality of evenly distributed spray heads 23 are installed through the outer wall of the fixed pipe 17, a PE baffle 22 is fixedly installed on the outer wall of the first filter cartridge 12, and a first water outlet pipe 19 is installed through the outer wall of the filter box 1.

[0028] The effect achieved by the entire embodiment 1 is that, during screening, the staff starts the second water pump 13, the second water pump 13 passes water and quartz particles into the first filter cartridge 12, starts the first motor 9, and the first gear 10 rotates, driving the second gear 11 to rotate counterclockwise, and a part of the first filter cartridge 12 is immersed in the water inside the filter box 1. As the first filter cartridge 12 rotates, the quartz particles adhere to the cylinder wall and rotate to the spray position, and the high-pressure water pump 16 is started. High-pressure water enters the fixed pipe 17 and is sprayed out from the spray head 23. It is crushed by high-pressure water. At the same time, a PE baffle 22 is set outside the cylinder at the water impact position to increase the crushing effect. The cylinder continues to rotate, and the crushed particles enter below the water level. After crushing, the particles with smaller particle size pass through the fixed aperture of the first filter cartridge 12 by gravity and enter the filter box 1. At this time, the crushing and screening can be completed, and the crushing process is pollution-free and dust-free to the material.

[0029] Embodiment 2, as Figure 1-Figure 7 As shown, further, a first water pump 8 is arranged on one side of the filter box 1, the input end of the first water pump 8 is fixedly connected to the first water outlet pipe 19, the output end of the first water pump 8 is fixedly installed with a second water inlet pipe 24, a microfilter 2 is arranged on one side of the first water pump 8, one end of the second water inlet pipe 24 passes through the microfilter 2 and a second fixed plate 33 is fixedly installed on the outer wall.

[0030] Furthermore, a second motor 28 is fixedly installed at one end of the microfilter 2, and the output end of the second motor 28 passes through the microfilter 2 and is fixedly installed with a third gear 29. A second filter cartridge 31 is rotatably installed on the inner wall of the microfilter 2, and a fourth gear 30 is fixedly installed on the outer wall of the second filter cartridge 31. The third gear 29 is meshingly connected with the fourth gear 30, and the side of the second filter cartridge 31 close to the second fixed plate 33 is in contact with the second fixed plate 33.

[0031] Furthermore, a high-pressure cleaning water pump 32 is fixedly installed inside the microfilter 2 , a support pipe 25 is fixedly installed at the output end of the high-pressure cleaning water pump 32 , and a plurality of evenly distributed high-pressure nozzles 26 are fixedly installed on the outer wall of the support pipe 25 .

[0032] Furthermore, a second water outlet pipe 34 is installed through one end of the microfilter 2, a second sewage pipe 35 is installed through one end of the microfilter 2, a second solenoid valve 36 is provided on the outer wall of the second sewage pipe 35, and a first sewage pipe 5 is installed through one end of the filter box 1, and a first solenoid valve 6 is provided on the outer wall of the first sewage pipe 5.

[0033] Furthermore, an operating tank 7 is arranged on one side of the first water pump 8, and a first electric heating plate 38 and a cooling plate 42 are fixedly installed on the outer wall of the operating tank 7, a U-shaped plate 40 is fixedly installed on the outer wall of the operating tank 7, an electric telescopic rod 41 is fixedly installed on the outer wall of the U-shaped plate 40, a partition 39 is installed through the inside of the operating tank 7, the telescopic end of the electric telescopic rod 41 passes through the U-shaped plate 40 and is slidably connected to the partition 39, and a feed pipe 37 is installed through the top of the operating tank 7.

[0034] Furthermore, a support plate 43 is fixedly installed on the outer wall of the cooling plate 42, a cooling box 44 is fixedly installed on the top of the support plate 43, a cooling water pump 45 is fixedly installed on the top of the support plate 43, the input end of the cooling water pump 45 is fixedly connected to the cooling box 44 through a water pipe, and a cooling pipe 46 is fixedly connected between the output end of the cooling water pump 45 and the cooling plate 42.

[0035] Furthermore, a drying box 3 is arranged at one end of the microfilter 2 near the second sewage pipe 35, a drainage pipe 47 is installed through the bottom of the drying box 3, a filter plate 48 is fixedly installed inside the drying box 3, a box door 4 is hinged at the top of the drying box 3, and a second electric heating plate 49 is fixedly installed on the outer wall of the drying box 3.

[0036] Furthermore, the outer walls of the second motor 28 and the first motor 9 are respectively sleeved with a second waterproof box 27 and a first waterproof box 21 .

[0037] The effect achieved by the entire embodiment 2 is that after the first screening is completed, the staff starts the second water pump 13, the screened particles enter the first water outlet pipe 19, and finally enter the second filter cartridge 31, the second motor 28 is started, the third gear 29 and the fourth gear 30 rotate, and the particles smaller than 50 microns leave the second filter cartridge 31, and then the second solenoid valve 36 is opened, and the particles leave the microfilter 2. At the same time, the high-pressure cleaning water pump 32 is started, and water flows from the high-pressure nozzle 26 to the second filter cartridge 31, spraying off the particles adsorbed on the inner wall of the second filter cartridge 31, so that further screening can be completed, thereby improving the accuracy of screening.

[0038] Working principle: During production, the staff puts the raw materials into the feed pipe 37, prepares the silica sol by ion exchange method, prepares a water glass solution with a concentration of 5%, removes sodium ions and other metal cations from the water glass solution through a cation exchange resin, and obtains a silicic acid solution. Then start the first electric heating plate 38, add ammonia water to adjust the pH of the sol at a constant temperature of 60°C, and gel the sol. Finally, start the electric telescopic rod 41, the partition 39 leaves the inside of the operating tank 7, and the sol falls to the bottom of the operating tank 7. Start the cooling water pump 45, pump cooling water into the cooling plate 42 to cool the raw materials, freeze the gel at -30°C for 24 hours, and then thaw it naturally at 20°C to obtain quartz particles with a certain strength. The staff passes water into the operating tank 7. During screening, the staff starts the second water pump 13, and the second water pump 13 passes water and quartz particles into the first filter cartridge 12, starts the first motor 9, and the first gear 10 rotates, driving the second gear 11 to rotate counterclockwise. A part of the first filter cartridge 12 is immersed in the water inside the filter box 1. As the first filter cartridge 12 rotates, the quartz particles adhere to the cylinder wall and rotate to the spray position. The high-pressure water pump 16 is started, and high-pressure water enters the fixed pipe 17 and is sprayed out from the spray head 23. The high-pressure water is used to crush the particles. At the same time, a PE baffle 22 is set outside the cylinder at the water impact position to increase the crushing effect. The cylinder continues to rotate, and the crushed particles enter below the water level. After crushing, the particles with smaller particle size pass through the fixed aperture of the first filter cartridge 12 through gravity and enter the filter box 1. At this time, the crushing and screening are completed. After the first screening is completed, the staff starts the second water pump 13, and the screened particles enter the first water outlet pipe 19 and finally enter the second filter cartridge 31. The second motor 28 is started, and the third gear 29 and the fourth gear 30 rotate. Particles smaller than 50 microns leave the second filter cartridge 31, and then the second solenoid valve 36 is opened, and the particles leave the microfilter 2. At the same time, the high-pressure cleaning water pump 32 is started, and water flows from the high-pressure nozzle 26 to the second filter cartridge 31, spraying the particles adsorbed on the inner wall of the second filter cartridge 31. The particles enter the drying box 3, and the sewage leaves from the drain pipe 47. At this time, the second electric heating plate 49 is started, the box door 4 is closed, and drying begins to obtain quartz particles of the target particle size. The crushing device set in this patent can only crush low-strength hydrous silica gel prepared by a synthetic process or dehydrated quartz particles that have not been sintered at high temperature, while natural ore or synthetic quartz after sintering has a high strength, so the crushing device cannot crush it.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A synthetic quartz crushing and screening device, comprising a filter box (1), characterized in that: A second water pump (13) is arranged on one side of the filter box (1); an input end of the second water pump (13) is fixedly connected to a connecting pipe (15); an output end of the second water pump (13) is fixedly connected to a first water inlet pipe (14); one end of the first water inlet pipe (14) passes through the filter box (1) and a first fixing plate (20) is fixedly mounted on the outer wall; a first motor (9) is fixedly mounted on the end of the filter box (1) away from the first water inlet pipe (14); an output end of the first motor (9) passes through the filter box (1) and a first gear (10) is fixedly mounted thereon; a first filter cartridge (12) is rotatably mounted on the inner wall of the filter box (1); a second gear (20) is fixedly mounted on the outer wall of the first filter cartridge (12) 11), the first gear (10) is meshingly connected with the second gear (11), a water tank (18) is fixedly installed on the outer wall of the filter box (1), a high-pressure water pump (16) is arranged on one side of the filter box (1), the water tank (18) and the input end of the high-pressure water pump (16) are fixedly connected through a water pipe, and a fixed pipe (17) is fixedly installed on the output end of the high-pressure water pump (16); one end of the fixed pipe (17) passes through a first fixed plate (20), and a plurality of evenly distributed spray heads (23) are installed through the outer wall of the fixed pipe (17), a PE baffle (22) is fixedly installed on the outer wall of the first filter cartridge (12), and a first water outlet pipe (19) is installed through the outer wall of the filter box (1).

2. A synthetic quartz crushing and screening device according to claim 1, characterized in that: A first water pump (8) is arranged on one side of the filter box (1); the input end of the first water pump (8) is fixedly connected to the first water outlet pipe (19); the output end of the first water pump (8) is fixedly mounted with a second water inlet pipe (24); a microfilter (2) is arranged on one side of the first water pump (8); one end of the second water inlet pipe (24) passes through the microfilter (2) and a second fixing plate (33) is fixedly mounted on the outer wall.

3. A synthetic quartz crushing and screening device according to claim 2, characterized in that: A second motor (28) is fixedly mounted on one end of the microfilter (2); an output end of the second motor (28) passes through the microfilter (2) and is fixedly mounted with a third gear (29); a second filter cartridge (31) is rotatably mounted on the inner wall of the microfilter (2); a fourth gear (30) is fixedly mounted on the outer wall of the second filter cartridge (31); the third gear (29) is meshingly connected with the fourth gear (30); and a side of the second filter cartridge (31) close to the second fixing plate (33) is in contact with the second fixing plate (33).

4. A synthetic quartz crushing and screening device according to claim 3, characterized in that: A high-pressure cleaning water pump (32) is fixedly installed inside the microfilter (2), a support pipe (25) is fixedly installed at the output end of the high-pressure cleaning water pump (32), and a plurality of evenly distributed high-pressure nozzles (26) are fixedly installed on the outer wall of the support pipe (25).

5. A synthetic quartz crushing and screening device according to claim 4, characterized in that: A second water outlet pipe (34) is installed through one end of the microfilter (2), a second sewage discharge pipe (35) is installed through one end of the microfilter (2), and a second solenoid valve (36) is provided on the outer wall of the second sewage discharge pipe (35); a first sewage discharge pipe (5) is installed through one end of the filter box (1), and a first solenoid valve (6) is provided on the outer wall of the first sewage discharge pipe (5).

6. A synthetic quartz crushing and screening device according to claim 5, characterized in that: An operating tank (7) is arranged on one side of the first water pump (8); a first electric heating plate (38) and a cooling plate (42) are fixedly mounted on the outer wall of the operating tank (7); a U-shaped plate (40) is fixedly mounted on the outer wall of the operating tank (7); an electric telescopic rod (41) is fixedly mounted on the outer wall of the U-shaped plate (40); a partition (39) is installed through the inside of the operating tank (7); the telescopic end of the electric telescopic rod (41) passes through the U-shaped plate (40) and is slidably connected to the partition (39); and a feed pipe (37) is installed through the top of the operating tank (7).

7. A synthetic quartz crushing and screening device according to claim 6, characterized in that: A support plate (43) is fixedly mounted on the outer wall of the cooling plate (42), a cooling box (44) is fixedly mounted on the top of the support plate (43), a cooling water pump (45) is fixedly mounted on the top of the support plate (43), an input end of the cooling water pump (45) is fixedly connected to the cooling box (44) via a water pipe, and a cooling pipe (46) is fixedly connected between the output end of the cooling water pump (45) and the cooling plate (42).

8. The synthetic quartz crushing and screening equipment according to claim 7, characterized in that: A drying box (3) is arranged at one end of the microfilter (2) close to the second sewage discharge pipe (35); a drainage pipe (47) is installed through the bottom of the drying box (3); a filter plate (48) is fixedly installed inside the drying box (3); a box door (4) is hinged at the top of the drying box (3); and a second electric heating plate (49) is fixedly installed on the outer wall of the drying box (3).

9. A synthetic quartz crushing and screening device according to claim 8, characterized in that: The outer walls of the second motor (28) and the first motor (9) are respectively sleeved with a second waterproof box (27) and a first waterproof box (21).

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