Corn quality grading equipment based on spectrum detection

Abstract

The invention relates to the technical field of agricultural product detection and grading, and discloses spectrum detection based corn quality grading equipment which comprises a box shell, a conveying cover is fixedly connected to the upper surface of the box shell, a feeding hopper is arranged on the outer wall of the conveying cover, and an impeller is fixedly connected to the middle of a second gear. A plurality of blades are fixedly connected to the outer wall of the impeller, a machine shell is arranged on the outer top wall of the box shell, a second screen is arranged on the inner wall of the box shell, a first discharging hopper is arranged at one end of the second screen, a guide plate is arranged at the bottom end of the inner wall of the box shell, a fourth discharging hopper is arranged at one end of the guide plate, and a conveying mechanism is arranged at the other end of a third rotating shaft. Erosion of dust to mechanical parts of equipment can be reduced through dust removal, the maintenance frequency of the equipment is reduced, the problem that the dust and the dust discharging effect are poor is solved, the dust is collected through the dust removal equipment, the discharging amount of the dust to the atmosphere can be effectively reduced, and pollution to the air is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural product detection and grading, and particularly to a corn quality grading device based on spectral detection. Background Art

[0002] As an important food crop and industrial raw material, the accurate grading of the quality of corn plays a crucial role in industries such as agricultural production and food processing. In agricultural production, corn is an important crop that is widely planted and applied. With the continuous increase in corn production and the development of the corn processing industry, the requirements for the quality of corn kernels are increasing day by day. Corn kernels will inevitably be contaminated with dust during the processes of harvesting, transportation, and storage. If these dusts are not removed, it will seriously affect the product quality.

[0003] Modern industrial production is developing towards automation and intelligence, and corn processing equipment is no exception. In an automated corn quality detection and processing production line, the dust on the corn kernels will have various adverse effects on the normal operation of the equipment. Currently, the quality grading equipment on the market is composed of structures such as lighting lamps, detection probes, and conveying devices. When the traditional quality grading equipment detects the quality of corn kernels, the dust and powder on the corn surface will accelerate the wear of mechanical components, increase the equipment failure rate, and the dust will also interfere with the spectral signal, resulting in inaccurate detection results. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a corn quality grading device based on spectral detection, which solves the problem of poor discharge effect of dust and powder.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A corn quality grading device based on spectral detection, including a box shell, the upper surface of the box shell is fixedly connected with a feeding cover, the outer wall of the feeding cover is provided with a feeding hopper, a spiral blade is arranged inside the feeding cover, a rotating shaft three is fixedly connected to the inner wall of the spiral blade, one side of the box shell is provided with a motor one, the output end of the motor one is fixedly connected with the rotating shaft three, one end of the rotating shaft three is fixedly connected with a gear one, the outer wall of the gear one is meshed with a gear two, the middle of the gear two is fixedly connected with an impeller, a plurality of blades are fixedly connected to the outer wall of the impeller, a machine shell is arranged on the outer top wall of the box shell, a second sieve is arranged on the inner wall of the box shell, one end of the second sieve is provided with a first discharge hopper, a guide plate is arranged at the bottom end of the inner wall of the box shell, one end of the guide plate is provided with a fourth discharge hopper, and a conveying mechanism is arranged at the other end of the rotating shaft three.

[0006] Preferably, the conveying mechanism includes a pulley. A belt is connected inside the first pulley. One end of the belt is connected to a second pulley. A first rotating shaft is fixedly connected to the middle of the second pulley. A splash guard is rotatably connected to the first rotating shaft. A conveyor belt is arranged on the outer wall of the first rotating shaft. A baffle is arranged on the upper surface of the conveyor belt.

[0007] Preferably, one end of the splash guard is fixedly connected to the outer wall of the box shell, and the other end of the splash guard is fixedly connected to a housing. An air compressor is arranged on the upper surface of the housing. An air duct is arranged at the output end of the air compressor.

[0008] Preferably, a communicating pipe is fixedly connected to the outer wall of the air duct through the housing. A nozzle is fixedly connected to the bottom end of the communicating pipe. A spectral detection device is fixedly connected to the inner wall of the housing.

[0009] Preferably, the spectral detection device includes a fixing plate. A plurality of induction cameras are arranged on the outer wall of the fixing plate. A lighting lamp is arranged on the outer bottom wall of the fixing plate.

[0010] Preferably, a good product hopper is arranged at the bottom end of the inner wall of the housing. A waste hopper is arranged on one side of the good product hopper. A screening device is arranged at the bottom end of the housing.

[0011] Preferably, the screening device includes a second motor. A second rotating shaft is fixedly connected to the output end of the second motor. The second rotating shaft penetrates through a filter rack and is fixedly connected to an eccentric wheel.

[0012] Preferably, a first screen is arranged on the inner wall of the filter rack. A third discharge hopper is arranged on one side of the first screen. A third screen is arranged at the bottom end of the inner wall of the filter rack. A second discharge hopper is arranged on one side of the third screen. A spring is arranged on the lower surface of the filter rack. A rubber pad is arranged at the bottom end of the spring.

[0013] Preferably, legs are arranged at the bottoms of the box shell, the splash guard and the housing.

[0014] Working principle: When using this device, corn kernels are poured into the inside of the material conveying cover through the feed hopper. The spiral blade rotates continuously in the material conveying cover driven by Motor 1. During the rotation process, the spiral blade pushes the corn kernels forward at a fixed pitch, enabling the corn kernels to pass through the conveying channel at a relatively stable flow rate and speed, and evenly conveying the incoming corn kernels to the opening of the material conveying cover. When the corn kernels enter the box shell, dust and powder will be generated and fill the inside of the box shell. The rotation of Gear 1 on Shaft 3 can be driven by the drive of Motor 1. The rotation of Gear 1 drives the rotation of Gear 2, thereby driving the impeller to rotate. When the impeller rotates, the blades installed on the outer wall also rotate. When the blades rotate, the dust and powder inside can be sucked out of the box shell through the holes in the machine shell. When the corn kernels are discharged from Discharge Hopper 1, they can fall evenly into the space between the baffles. When the corn kernels are conveyed by the baffles to the inside of the outer shell, the lighting lamp illuminates the corn kernels, generating optical signals from the corn kernels. Multiple induction cameras installed on the fixed plate quickly take pictures of the conveyed corn kernels. The taken pictures are transmitted to the external control unit, and the control unit can perform spectral analysis on the pictures to distinguish spectral signals. The waste is sprayed into the waste hopper, and the qualified materials fall into Screen 1 for size differentiation, facilitating the progress of the next process.

[0015] The present invention provides a corn quality grading device based on spectral detection. It has the following beneficial effects:

[0016] 1. Through the operation of the motor, the rotation of Gear 1, Gear 2, the impeller, and the blades is driven, which can effectively remove the dust on the surface of the corn kernels, making the corn kernels cleaner. It can also prevent damage to the device, ensure the accuracy of quality detection, reduce the maintenance frequency of the device, extend the service life of the device, lower the operating cost of the device, solve the problem of poor dust and powder discharge effect, effectively reduce the dust emission into the atmosphere, and avoid air pollution.

[0017] 2. Through the operation of the air compressor and the spectral detection device, the quality grading of the corn kernels can be achieved, differentiating unqualified corn kernels and waste. The detection of the corn kernels can be completed in a short time, ensuring the stable operation of the device. The analysis speed is fast and the accuracy is high, meeting the requirements of large-scale production and rapid detection, solving the problem of low efficiency of manual detection. The spectral acquisition improves the efficiency and accuracy, and does not cause damage to its surface, saving a large amount of time and labor costs.

[0018] 3. Through the operation of the screening device of the present invention, the corn kernels can be vibrationally screened according to their particle sizes, and foreign matters can also be separated. After screening, corn kernels of different particle sizes can enter subsequent different product selection processes respectively, and can also be screened according to the shape of the corn kernels, improving the product selection efficiency, solving the problem of poor effect in distinguishing particle sizes, screening out qualified corn kernels, and meeting the requirements of different food processing technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a front three-dimensional schematic diagram of the present invention;

[0020] Figure 2 is a cross-sectional view of the internal structure of the casing of the present invention;

[0021] Figure 3 is a partial structural schematic diagram of the spiral blade of the present invention;

[0022] Figure 4 is a partial cross-sectional view of the structure at the filter rack of the present invention;

[0023] Figure 5 is a partial structural schematic diagram of the conveyor belt of the present invention;

[0024] Figure 6 is a partial cross-sectional view of the structure of the outer shell of the present invention.

[0025] Among them, 1. Casing; 2. First gear; 3. Feeding cover; 4. Feeding hopper; 5. First motor; 6. First pulley; 7. Belt; 8. Leg; 9. Second pulley; 10. First rotating shaft; 11. First discharge hopper; 12. Splash guard; 13. Second rotating shaft; 14. Outer shell; 15. Second motor; 16. Eccentric wheel; 17. Filter rack; 18. Rubber pad; 19. Spring; 20. Second discharge hopper; 21. Third discharge hopper; 22. First screen; 23. Air compressor; 24. Air duct; 25. Conveyor belt; 26. Baffle; 27. Third rotating shaft; 28. Impeller; 29. Second gear; 30. Second screen; 31. Guide plate; 32. Fourth discharge hopper; 33. Spiral blade; 34. Blade; 35. Machine shell; 36. Third screen; 37. Fixed plate; 38. Inductive camera; 39. Lighting lamp; 40. Connecting pipe; 41. Air nozzle; 42. Waste hopper; 43. Good product hopper. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment:

[0028] Please refer to the attached Figure 1 - Attachment Figure 3 , an embodiment of the present invention provides a corn quality grading device based on spectral detection, including a box shell 1. A feeding cover 3 is fixedly connected to the upper surface of the box shell 1. A feeding hopper 4 is arranged on the outer wall of the feeding cover 3. A spiral blade 33 is arranged inside the feeding cover 3. A rotating shaft three 27 is fixedly connected to the inner wall of the spiral blade 33. A motor one 5 is arranged on one side of the box shell 1. The output end of the motor one 5 is fixedly connected to the rotating shaft three 27. One end of the rotating shaft three 27 is fixedly connected to a gear one 2. A gear two 29 is meshed with the outer wall of the gear one 2. An impeller 28 is fixedly connected to the middle of the gear two 29. A plurality of blades 34 are fixedly connected to the outer wall of the impeller 28. A machine shell 35 is arranged on the outer top wall of the box shell 1. A second sieve 30 is arranged on the inner wall of the box shell 1. A first discharge hopper 11 is arranged at one end of the second sieve 30. A guide plate 31 is arranged at the bottom end of the inner wall of the box shell 1. A fourth discharge hopper 32 is arranged at one end of the guide plate 31. A conveying mechanism is arranged at the other end of the rotating shaft three 27.

[0029] Specifically, when it is necessary to detect the quality of corn kernels, the first motor 5 installed on one side of the box shell 1 can be started to operate the starting device. The first motor 5 can drive the third rotating shaft 27 to rotate, and the third rotating shaft 27 drives the spiral blade 33 to rotate. The user can pour the corn kernels from the feed hopper 4, and the corn kernels will enter the inside of the material conveying cover 3. The spiral blade 33 continuously rotates in the material conveying cover 3 driven by the first motor 5. During the rotation of the spiral blade 33, it pushes the corn kernels forward at a fixed pitch, enabling the corn kernels to pass through the conveying channel at a relatively stable flow rate and speed, and evenly conveying the incoming corn kernels to the opening of the material conveying cover 3. The corn kernels will fall from the opening onto the lower second sieve 30. Most of the corn kernels will be contaminated with dust, soil, glume fragments, and corn silk shreds. When falling onto the second sieve 30, the attachments on the corn kernels can be preliminarily screened out. The corn kernels will slide from the second sieve 30 to the first discharge hopper 11 for the next step of processing. The attachments such as dust and soil that fall through the holes of the second sieve 30 can be led out from the fourth discharge hopper 32 along the guide plate 31. When a large amount of corn kernels enter the box shell 1, a large amount of dust and the dust on the corn kernels will fill the inside of the box shell 1. To avoid the phenomenon of dust and dust accumulation and blockage, the user can drive the first gear 2 on the third rotating shaft 27 to rotate through the drive of the first motor 5, and the rotation of the first gear 2 drives the second gear 29 to rotate, thereby driving the impeller 28 to rotate. When the impeller 28 rotates, it drives the blades 34 installed on the outer wall to rotate. When the blades 34 rotate, the internal dust and dust can be evacuated from the holes of the machine shell 35 from the inside of the box shell 1. According to the principle of equal linear velocity of gear transmission, to increase the rotation speed of the second gear 29, the number of teeth of the first gear 2 on the third rotating shaft 27 driven by the first motor 5 should be more than the number of teeth of the second gear 29 on the impeller 28, thereby accelerating the rotation speed of the impeller 28, and then achieving the effect of discharging dust and dust at a high rotation speed. Through the first motor 5, the first gear 2, the second gear 29, the impeller 28, and the blades 34, the effect of quickly discharging dust and dust can be achieved. It can not only quickly discharge dust and dust, but also avoid damage to the equipment, improve the purity of corn kernels, ensure the accuracy of quality detection, and the dust removal can reduce the erosion of dust on the mechanical components of the equipment, reduce the maintenance frequency of the equipment, solve the problem of poor dust and dust discharge effect. By collecting the dust through the dust removal equipment, the dust emission into the atmosphere can be effectively reduced, avoiding air pollution.

[0030] Please refer to the attached Figure 1 、attached Figure 5 、attached Figure 6, the conveying mechanism includes a first pulley 6, a belt 7 is connected inside the first pulley 6, one end of the belt 7 is connected to a second pulley 9, a first rotating shaft 10 is fixedly connected to the middle of the second pulley 9, the first rotating shaft 10 is rotatably connected to a splash guard 12, a conveyor belt 25 is arranged on the outer wall of the first rotating shaft 10, and a baffle 26 is arranged on the upper surface of the conveyor belt 25; one end of the splash guard 12 is fixedly connected to the outer wall of the box shell 1, the other end of the splash guard 12 is fixedly connected to a housing 14, an air compressor 23 is arranged on the upper surface of the housing 14, and an air duct 24 is arranged at the output end of the air compressor 23; a connecting pipe 40 is fixedly connected to the outer wall of the air duct 24 through the housing 14, a nozzle 41 is fixedly connected to the bottom end of the connecting pipe 40, and a spectral detection device is fixedly connected to the inner wall of the housing 14; the spectral detection device includes a fixing plate 37, a plurality of induction cameras 38 are arranged on the outer wall of the fixing plate 37, and a lighting lamp 39 is arranged on the outer bottom wall of the fixing plate 37; a good product hopper 43 is arranged at the bottom end of the inner wall of the housing 14, a waste hopper 42 is arranged on one side of the good product hopper 43, and a screening device is arranged at the bottom end of the housing 14.

[0031] Specifically, when the corn kernels are continuously fed through the first discharge hopper 11, the first motor 5 drives the first pulley 6 to rotate, and the first pulley 6 drives the conveying mechanism to operate. The conveying mechanism includes a belt 7, a second pulley 9, a first rotating shaft 10, a splash guard 12, a conveyor belt 25, and a baffle 26. When the first motor 5 drives the first pulley 6 to rotate, the belt 7 in the first pulley 6 drives the second pulley 9 to rotate, thereby driving the first rotating shaft 10 to rotate. The first rotating shaft 10 rotates within the two splash guards 12, driving the conveyor belt 25 to move. When the conveyor belt 25 moves, it drives the baffle 26 to move. The distances between the baffles 26 are equal, and when the corn kernels are discharged from the first discharge hopper 11, they can evenly fall into the space between the baffles 26. When the corn kernels are discharged from the first discharge hopper 11 and fall onto the conveyor belt 25, they will bounce. When the conveyor belt 25 moves, its surface will give the corn kernels a relatively large frictional force. This frictional force will cause the corn kernels to generate a forward acceleration in a short period of time. However, due to the inertia of the corn kernels, they may first bounce upward. The baffle 26 can block the inertial force of the corn kernels, and the splash guard 12 can block the bouncing of the corn kernels to prevent the corn kernels from falling to the ground. One end of the splash guard 12 is connected to the outer shell 14. The air compressor 23 on the upper surface of the outer shell 14 can compress air and spray the compressed air from the air nozzle 41 through the air duct 24 and the connecting pipe 40. The inner wall of the outer shell 14 is provided with a spectral detection device. Through the spectral detection device, spectral collection of the moving corn can be carried out. The spectral detection device includes a fixing plate 37, an induction camera 38, and a lighting lamp 39. The spectral detection device is connected to an external detection system. When the corn kernels are conveyed to the inside of the outer shell 14 through the baffle 26, the lighting lamp 39 illuminates the corn kernels to generate optical signals. Multiple induction cameras 38 installed on the fixing plate 37 quickly take pictures of the conveyed corn kernels, and the taken pictures are transmitted to an external control unit. The control unit can perform spectral analysis on the pictures. Different materials generate different spectra, which facilitates the control unit to distinguish corn kernels from other materials. The control unit controls the air compressor 23 through an electrical signal. When other spectral signals are detected, the air compressor 23 can be made to spray air, spraying the compressed air onto the waste. The impacted waste will fall straight down into the inside of the good product hopper 43. The corn kernels with no problem detected in the spectral signal can be directly sent into the waste hopper 42 by the inertia of the conveyor belt 25. Through the mutual cooperation of the air compressor 23, the air nozzle 41, the induction camera 38, and the lighting lamp 39, the effect of quality grading can be achieved. It can not only distinguish the quality of the corn kernels, but also distinguish unqualified corn kernels and waste, ensuring the stable operation of the equipment, with fast analysis speed, high accuracy, not changing the nature and structure of the sample, being able to ensure the consistency of the detection results, solving the problem of low efficiency of manual detection. The spectral collection improves the efficiency and accuracy and does not cause damage to its surface.

[0032] Please refer to the attached Figure 1 and the attached Figure 4 The screening device includes a second motor 15. The output end of the second motor 15 is fixedly connected to a second rotating shaft 13. The second rotating shaft 13 penetrates through the filter frame 17 and is fixedly connected to an eccentric wheel 16. A first screen 22 is arranged on the inner wall of the filter frame 17. A third discharge hopper 21 is arranged on one side of the first screen 22. A third screen 36 is arranged at the bottom end of the inner wall of the filter frame 17. A second discharge hopper 20 is arranged on one side of the third screen 36. A spring 19 is arranged on the lower surface of the filter frame 17. A rubber pad 18 is arranged at the bottom end of the spring 19. Legs 8 are arranged at the bottoms of the box shell 1, the splash guard 12, and the outer shell 14.

[0033] Specifically, after being detected by the spectral detection device, the corn kernels are classified into waste and good-quality materials according to different spectral signals. The classified good-quality corn kernels fall into the screening device through the waste hopper 42 for further screening of the particle size of the corn kernels. The screening device includes a second motor 15, a filter frame 17, a second rotating shaft 13, an eccentric wheel 16, a first screen 22, a third screen 36, a third discharge hopper 21, a second discharge hopper 20, a rubber pad 18, and a spring 19. When the corn kernels fall from the waste hopper 42 into the filter frame 17, the second motor 15 can be started. The second motor 15 drives the second rotating shaft 13 to rotate, and the second rotating shaft 13 drives the eccentric wheels 16 on both sides to rotate. The first screen 22 and the third screen 36 installed on the inner wall of the filter frame 17 can distinguish the corn kernel particles. When the corn kernels fall onto the first screen 22, the smaller particles fall onto the third screen 36 through the vibration of the eccentric wheel 16. While vibrating, the corn kernels are discharged through the third discharge hopper 21 and the second discharge hopper 20. The spring 19 and the rubber pad 18 can buffer the vibration brought by the eccentric wheel 16 during the operation of the second motor 15, and at the same time reduce the noise generated during operation. Through the screening mechanism, the effect of vibrating and screening the particle size of the corn kernels can be achieved. It can not only screen the particle size but also separate foreign objects. After the corn kernels are screened, the corn kernels with different particle sizes can enter different subsequent selection processes respectively, and the impurities can also be separated from the corn kernels, improving the selection efficiency, solving the problem of poor effect in distinguishing particle sizes, and can accurately screen out the corn kernels that meet specific size requirements, meeting the needs of different food processing technologies.

[0034] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A corn quality grading device based on spectral detection, comprising a box shell (1), characterized in that: A feeding cover (3) is fixedly connected to the upper surface of the box shell (1). A feed hopper (4) is arranged on the outer wall of the feeding cover (3). A spiral blade (33) is arranged inside the feeding cover (3). A third rotating shaft (27) is fixedly connected to the inner wall of the spiral blade (33). A first motor (5) is arranged on one side of the box shell (1). The output end of the first motor (5) is fixedly connected to the third rotating shaft (27). One end of the third rotating shaft (27) is fixedly connected to a first gear (2). A second gear (29) is meshed with the outer wall of the first gear (2). An impeller (28) is fixedly connected to the middle of the second gear (29). A plurality of blades (34) are fixedly connected to the outer wall of the impeller (28). A machine shell (35) is arranged on the outer top wall of the box shell (1). A second screen (30) is arranged on the inner wall of the box shell (1). A first discharge hopper (11) is arranged at one end of the second screen (30). A guide plate (31) is arranged at the bottom end of the inner wall of the box shell (1). A fourth discharge hopper (32) is arranged at one end of the guide plate (31). A conveying mechanism is arranged at the other end of the third rotating shaft (27).

2. The corn quality grading device based on spectral detection according to claim 1, wherein: The conveying mechanism includes a first pulley (6). A belt (7) is connected inside the first pulley (6). One end of the belt (7) is connected to a second pulley (9). A first rotating shaft (10) is fixedly connected to the middle of the second pulley (9). A splash guard (12) is rotatably connected to the first rotating shaft (10). A conveyor belt (25) is arranged on the outer wall of the first rotating shaft (10). A baffle (26) is arranged on the upper surface of the conveyor belt (25).

3. The maize quality grading device based on spectral detection according to claim 2, wherein: One end of the splash guard (12) is fixedly connected to the outer wall of the box shell (1). The other end of the splash guard (12) is fixedly connected to a housing (14). An air compressor (23) is arranged on the upper surface of the housing (14). An air duct (24) is arranged at the output end of the air compressor (23).

4. The maize quality grading device based on spectral detection according to claim 3, characterized in that: The air duct (24) penetrates through the housing (14) and is fixedly connected to a communicating pipe (40). A nozzle (41) is fixedly connected to the bottom end of the communicating pipe (40). A spectral detection device is fixedly connected to the inner wall of the housing (14).

5. A corn quality grading device based on spectral detection according to claim 4, characterized in that: The spectral detection device includes a fixing plate (37). A plurality of induction cameras (38) are arranged on the outer wall of the fixing plate (37). A lighting lamp (39) is arranged on the outer bottom wall of the fixing plate (37).

6. The maize quality grading device based on spectral detection according to claim 3, characterized in that: A good product hopper (43) is arranged at the bottom end of the inner wall of the housing (14). A waste hopper (42) is arranged on one side of the good product hopper (43). A screening device is arranged at the bottom end of the housing (14).

7. The maize quality grading device based on spectral detection according to claim 6, characterized in that: The screening device includes a second motor (15). The output end of the second motor (15) is fixedly connected to a second rotating shaft (13). The second rotating shaft (13) penetrates through a filter rack (17) and is fixedly connected to an eccentric wheel (16).

8. A corn quality grading device based on spectral detection according to claim 7, characterized in that: The inner wall of the filter rack (17) is provided with a first sieve (22), one side of the first sieve (22) is provided with a third discharge hopper (21), the bottom end of the inner wall of the filter rack (17) is provided with a third sieve (36), one side of the third sieve (36) is provided with a second discharge hopper (20), the lower surface of the filter rack (17) is provided with a spring (19), and the bottom end of the spring (19) is provided with a rubber pad (18).

9. A corn quality grading device based on spectral detection according to claim 1, characterized in that: Legs (8) are provided at the bottoms of the box shell (1), the splash guard (12) and the outer shell (14).

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