Automatic cleaning device for hard disk loading box

Abstract

The invention belongs to the technical field of cleaning equipment, particularly relates to an automatic cleaning device for a hard disk loading box, and aims to solve the problem that a cleaning blind area exists on the surface of the loading box due to the fact that the coverage range and the angle of the cleaning device for the hard disk loading box are limited. The multi-directional spraying module comprises a main frame body, the inner wall of the main frame body is fixedly connected with two symmetrical mounting frames, the two mounting frames are provided with the same piece pushing module, one side of the main frame body is fixedly connected with a discharging hopper, the discharging hopper is provided with a discharging auxiliary module, and the multi-directional spraying module comprises two symmetrical mounting rod frames. According to the automatic cleaning device for the hard disk loading box, the conveying speed and the cleaning action can be synchronously matched, all-directional covering of surface grooves, edges and complex structures of the loading box is achieved, cleaning blind areas are eliminated, the cleaning efficiency and consistency are improved, and sanitation and safety of a production line and the product yield are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of cleaning equipment, and in particular to an automatic cleaning device for a hard disk loading box. Background Art

[0002] A hard disk loading box is a special container or bracket used to safely store, transport or install hard disk drives, and is commonly used in production, testing or maintenance scenarios. Its core functions include: physical protection, standardized adaptation, efficient operation and maintenance support, and pollution prevention. In the hot-swap scenario of hard disks in data centers, the loading box, as a medium between hard disks and server backplanes, must ensure accurate plugging and unplugging and stable signals; and on automated test lines, its design must take into account both shock resistance and easy cleanability during high-speed transmission to ensure test efficiency and hard disk yield.

[0003] In the prior art, during the cleaning process of the hard disk loading box on the assembly line, the coverage and angle of the cleaning device are limited. In addition, the lack of synchronization between the conveying speed and the cleaning action makes it impossible to reach some grooves, edges or complex structure areas, resulting in cleaning blind spots on the surface of the loading box, affecting product yield and hygiene. Summary of the invention

[0004] The invention discloses an automatic cleaning device for a hard disk loading box, aiming to solve the technical problem that the coverage range and angle of the cleaning device for the hard disk loading box in the background technology are limited, resulting in a cleaning blind area on the surface of the loading box.

[0005] The present invention proposes an automatic cleaning device for a hard disk loading box, comprising a main frame, wherein a multi-directional spray module is arranged on the main frame, and two symmetrical mounting frames are fixedly connected to the inner wall of the main frame, and the same pushing module is arranged on the two mounting frames, and a material discharge hopper is fixedly connected to one side of the main frame, and a material discharge auxiliary module is arranged on the material discharge hopper, the multi-directional spray module comprises two symmetrical mounting rod frames, and circular holes are opened on the two mounting rod frames, and the same spray pipe is fixedly connected in the two circular holes, and a plurality of spray heads are arranged at equal distances on the spray pipe, the pushing module comprises two symmetrical electric telescopic rods, and the two electric telescopic rods are fixedly connected to the top of the corresponding mounting frames, and the material discharge auxiliary module comprises a mounting frame, the mounting frame is fixedly connected to the material discharge hopper, and a blow pipe is fixedly connected to one side of the mounting frame, and a plurality of blow nozzles are arranged at equal distances on the blow pipe.

[0006] In a preferred embodiment, circular grooves are provided on the inner walls on both sides of the main frame, rotating frames are fixedly connected in the two circular grooves, two mounting rod frames are movably connected to the outside of the corresponding rotating frames, and sliding hole grooves are provided on the opposite sides of the two mounting rod frames.

[0007] In a preferred embodiment, two fixing parts are fixedly connected to the outer walls on both sides of the main frame, and rotation holes are opened on the multiple fixing parts. Threaded rods are movably connected in the corresponding two rotation holes, and drive motors are fixedly connected to the outer walls on both sides of the main frame, and the output ends of the two drive motors are fixedly connected to one end of the corresponding threaded rod.

[0008] In a preferred solution, the outsides of the two threaded rods are connected to sliding parts through threads, the sides of the two sliding parts close to each other are fixedly connected to connecting rods, the ends of the two connecting rods away from the sliding parts are provided with mounting holes, the two mounting holes are movably connected to sliding rods, and the two sliding rods slide in the corresponding sliding hole grooves.

[0009] In a preferred solution, the bottom of the main frame is fixedly connected to a water tank, the inner wall of the water tank is fixedly connected to a filter plate, and one side of the water tank is fixedly connected to a delivery pump, the input end of the delivery pump is fixedly connected to the water tank, the output end of the delivery pump is fixedly connected to a delivery pipe, and the end of the delivery pipe away from the delivery pump is fixedly connected to one end of the spray pipe.

[0010] By setting up a multi-directional spray module, the threaded rods are rotated by driving motors on both sides, driving the sliding parts to drive the connecting rods to move. The sliding rods slide in the sliding holes, forcing the mounting rod frame to drive the spray pipes to move in a circular motion. The conveying speed and the cleaning action are coordinated synchronously to achieve full coverage of the grooves, edges and complex structures on the surface of the loading box, eliminate cleaning blind spots, significantly improve cleaning efficiency and consistency, and ensure the hygiene and safety of the production line and product yield.

[0011] In a preferred solution, movable holes are opened on the two mounting frames at equal distances, and conveying rods are movably connected in the corresponding two movable holes. One end of the multiple conveying rods is fixedly connected with transmission teeth, and the same transmission chain is arranged outside the multiple transmission teeth. A universal motor is fixedly connected to the inner wall of one side of the main frame, and the output end of the universal motor is fixedly connected to one end of the corresponding conveying rod.

[0012] In a preferred embodiment, the pusher module also includes two sliding seats, both of which slide on the outside of the corresponding two conveying rods, and the driving ends of the two electric telescopic rods are fixedly connected to the corresponding sliding seats, and the inner walls of the two sliding seats are movably connected with multiple flexible wheels at equal distances.

[0013] By providing a pushing module, when the loading box reaches between the two sliding seats, the electric telescopic rods on both sides are started synchronously to push the sliding seat to slide outside the conveying rod, and the movable flexible wheels are used to push the loading box in transit to the center position, which facilitates subsequent operation steps and improves convenience.

[0014] In a preferred embodiment, the top of the lower hopper is fixedly connected to two symmetrical special-shaped mounting plates, the tops of the two special-shaped mounting plates are fixedly connected to mounting rods, the outsides of the two mounting rods are movably connected to rotating contact plates, and the opposite sides of the two special-shaped mounting plates are fixedly connected to arc-shaped rods, the two rotating contact plates slide on the outsides of the corresponding arc-shaped rods, the outsides of the two arc-shaped rods are surrounded by springs, one end of the two springs is fixedly connected to the corresponding special-shaped mounting plates, and the other end is fixedly connected to the corresponding rotating contact plates.

[0015] In a preferred embodiment, an air pump is fixedly connected to one side of the mounting frame, and an air filter is fixedly connected to the output end of the air pump, a connecting pipe is fixedly connected to the outlet end of the air filter, and one end of the connecting pipe away from the air filter is fixedly connected to the blowing pipe.

[0016] In a preferred solution, a plurality of heating rings are arranged at equal distances outside the blowing pipe, and a plurality of mutually symmetrical baffles are fixedly connected to the top of the lower hopper.

[0017] By providing a material unloading auxiliary module, when the loading box contacts the rotating contact plate, the rotating contact plate compresses the spring and slides on the outer wall of the arc-shaped rod, and the elastic action of the spring slows down the falling speed of the loading box to avoid damage caused by collision; at the same time, the air pump and the heating ring are started, and the air pump sends the air filtered by the air filter into the blowing pipe through the connecting pipe, and after being heated by the heating ring, it is sprayed from the blowing nozzle to the slowly falling loading box, thereby accelerating the drying speed of the loading box.

[0018] From the above, it can be seen that the automatic cleaning device for a hard disk loading box provided by the present invention utilizes a multi-directional spray module to synchronize the conveying speed with the cleaning action, thereby achieving all-round coverage of the grooves, edges and complex structures on the surface of the loading box, eliminating cleaning blind spots, and significantly improving the cleaning efficiency and consistency, thereby ensuring the sanitation and safety of the production line and the product yield. At the same time, during transportation, the pushing module can push the loading box in transit to the center position to facilitate subsequent operation steps, and the unloading auxiliary module can slow down the falling speed of the loading box to avoid damage caused by collision. At the same time, hot air is used to spray the slowly falling loading box to accelerate the drying speed of the loading box. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of an automatic cleaning device for a hard disk loading box proposed by the present invention; Figure 2 A schematic diagram of the bottom structure of an automatic cleaning device for a hard disk loading box proposed by the present invention; Figure 3 This is a schematic diagram of the structure of a multi-directional spray module of an automatic cleaning device for a hard disk loading box proposed by the present invention; Figure 4 This is a structural schematic diagram of the connecting rod of a multi-directional spray module of an automatic cleaning device for a hard disk loading box proposed by the present invention; Figure 5 This is a schematic structural diagram of a pusher module of an automatic cleaning device for a hard disk loading box proposed by the present invention; Figure 6 This is a structural schematic diagram of a material unloading auxiliary module of an automatic cleaning device for a hard disk loading box proposed by the present invention; Figure 7 This is a structural schematic diagram of the special-shaped mounting plate of a material unloading auxiliary module of an automatic cleaning device for a hard disk loading box proposed by the present invention.

[0020] In the figure: 1, main frame; 2, filter plate; 3, water tank; 4, delivery pump; 5, delivery pipe; 6, multi-directional spray module; 601, rotating frame; 602, spray pipe; 603, spray head; 604, fixing piece; 605, threaded rod; 606, driving motor; 607, sliding piece; 608, connecting rod; 609, sliding rod; 610, mounting rod frame; 611, sliding hole groove; 7, push piece module; 701, sliding seat; 702, electric telescopic rod; 703, flexible Wheel; 8. Unloading auxiliary module; 801. Mounting frame; 802. Blowing pipe; 803. Blowing nozzle; 804. Air pump; 805. Air filter; 806. Connecting pipe; 807. Heating ring; 808. Special-shaped mounting plate; 809. Mounting rod; 810. Rotating contact plate; 811. Arc rod; 812. Spring; 813. Baffle; 9. Unloading hopper; 10. Mounting frame; 11. Conveying rod; 12. Transmission gear; 13. Transmission chain; 14. Universal motor. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] The automatic cleaning device for a hard disk loading box disclosed in the present invention is mainly used in scenarios where the coverage range and angle of the cleaning device of the hard disk loading box are limited, resulting in a cleaning blind spot on the surface of the loading box.

[0023] Reference Figure 1-Figure 7, an automatic cleaning device for a hard disk loading box, comprising a main frame 1, a multi-directional spray module 6 is arranged on the main frame 1, and the inner wall of the main frame 1 is fixedly connected to two mutually symmetrical mounting frames 10, and the two mounting frames 10 are provided with the same pusher module 7, a lower hopper 9 is fixedly connected to one side of the main frame 1, and the lower hopper 9 is provided with a lowering auxiliary module 8, the multi-directional spray module 6 includes two mutually symmetrical mounting rods 610, and the two mounting rods 610 are both provided with round holes, and the two round holes are provided on the inner wall of the main frame 1. A same spray pipe 602 is fixedly connected in the hole, and a plurality of spray heads 603 are arranged at equal distances on the spray pipe 602. The pushing module 7 includes two symmetrical electric telescopic rods 702, and the two electric telescopic rods 702 are fixedly connected to the top of the corresponding mounting frame 10. The unloading auxiliary module 8 includes a mounting frame 801, and the mounting frame 801 is fixedly connected to the unloading hopper 9, and a blowing pipe 802 is fixedly connected to one side of the mounting frame 801, and a plurality of blowing nozzles 803 are arranged at equal distances on the blowing pipe 802.

[0024] Reference Figure 1 , Figure 3 and Figure 4 Circular grooves are provided on the inner walls on both sides of the main frame 1, and rotating frames 601 are fixedly connected in the two circular grooves. Two mounting rod frames 610 are movably connected to the outside of the corresponding rotating frames 601, and sliding holes 611 are provided on the opposite sides of the two mounting rod frames 610.

[0025] Reference Figure 1 , Figure 3 and Figure 4 Two fixing parts 604 are fixedly connected to the outer walls on both sides of the main frame 1, and rotation holes are opened on the multiple fixing parts 604. Threaded rods 605 are movably connected in the corresponding two rotation holes, and driving motors 606 are fixedly connected to the outer walls on both sides of the main frame 1. The output ends of the two driving motors 606 are fixedly connected to one end of the corresponding threaded rod 605.

[0026] Reference Figure 1 , Figure 3 and Figure 4 The outsides of the two threaded rods 605 are connected to sliding members 607 through threads, and the sides of the two sliding members 607 close to each other are fixedly connected to connecting rods 608. The ends of the two connecting rods 608 away from the sliding members 607 are provided with mounting holes, and sliding rods 609 are movably connected in the two mounting holes, and the two sliding rods 609 slide in the corresponding sliding hole grooves 611.

[0027] Reference Figure 1 and Figure 2A water tank 3 is fixedly connected to the bottom of the main frame 1, a filter plate 2 is fixedly connected to the inner wall of the water tank 3, and a delivery pump 4 is fixedly connected to one side of the water tank 3, an input end of the delivery pump 4 is fixedly connected to the water tank 3, an output end of the delivery pump 4 is fixedly connected to a delivery pipe 5, and an end of the delivery pipe 5 away from the delivery pump 4 is fixedly connected to one end of the spray pipe 602.

[0028] In a specific application scenario, the threaded rod 605 is rotated by driving motors 606 on both sides, driving the sliding member 607 to drive the connecting rod 608 to move, and the sliding rod 609 slides in the sliding hole 611, forcing the mounting rod frame 610 to drive the spray pipe 602 to move in a circular motion, so that the conveying speed and the cleaning action are coordinated synchronously, achieving all-round coverage of the grooves, edges and complex structures on the surface of the loading box, eliminating cleaning blind spots, significantly improving cleaning efficiency and consistency, and ensuring the hygiene and safety of the production line and product yield.

[0029] Reference Figure 1 and Figure 5 , movable holes are opened at equal distances on the two mounting frames 10, and conveying rods 11 are movably connected in the corresponding two movable holes. One end of the multiple conveying rods 11 is fixedly connected with a transmission tooth 12, and the same transmission chain 13 is arranged outside the multiple transmission teeth 12, and a universal motor 14 is fixedly connected to the inner wall of one side of the main frame 1, and the output end of the universal motor 14 is fixedly connected to one end of the corresponding conveying rod 11.

[0030] Reference Figure 1 and Figure 5 The pusher module 7 also includes two sliding seats 701, which slide on the outside of the corresponding two conveying rods 11, and the driving ends of the two electric telescopic rods 702 are fixedly connected to the corresponding sliding seats 701. The inner walls of the two sliding seats 701 are movably connected with multiple flexible wheels 703 at equal distances.

[0031] In a specific application scenario, when the loading box reaches between the two sliding seats 701, the electric telescopic rods 702 on both sides are started synchronously to push the sliding seats 701 to slide outside the conveying rod 11, and the movable flexible wheels 703 are used to push the loading box in transit to the center position, which facilitates subsequent operation steps and improves convenience.

[0032] Reference Figure 1 , Figure 6 and Figure 7The top of the lower hopper 9 is fixedly connected to two symmetrical special-shaped mounting plates 808, the tops of the two special-shaped mounting plates 808 are fixedly connected to mounting rods 809, the outsides of the two mounting rods 809 are movably connected to rotating contact plates 810, and the opposite sides of the two special-shaped mounting plates 808 are fixedly connected to arc-shaped rods 811, the two rotating contact plates 810 slide on the outside of the corresponding arc-shaped rods 811, the outsides of the two arc-shaped rods 811 are surrounded by springs 812, one end of the two springs 812 is fixedly connected to the corresponding special-shaped mounting plates 808, and the other end is fixedly connected to the corresponding rotating contact plates 810.

[0033] Reference Figure 1 , Figure 6 and Figure 7 An air pump 804 is fixedly connected to one side of the mounting frame 801, and an air filter 805 is fixedly connected to the output end of the air pump 804, a connecting pipe 806 is fixedly connected to the outlet end of the air filter 805, and one end of the connecting pipe 806 away from the air filter 805 is fixedly connected to the blowing pipe 802.

[0034] Reference Figure 1 , Figure 6 and Figure 7 A plurality of heating rings 807 are arranged at equal distances on the outside of the blowing pipe 802, and a plurality of mutually symmetrical baffles 813 are fixedly connected to the top of the lower hopper 9.

[0035] In a specific application scenario, when the loading box contacts the rotating contact plate 810, the rotating contact plate 810 compresses the spring 812 to slide on the outer wall of the arc rod 811, and the elastic action of the spring 812 slows down the falling speed of the loading box to avoid damage caused by collision; at the same time, the air pump 804 and the heating ring 807 are started, and the air pump 804 sends the air filtered by the air filter 805 into the blowing pipe 802 through the connecting pipe 806. After being heated by the heating ring 807, the air is sprayed from the blowing nozzle 803 to the slowly falling loading box, thereby accelerating the drying speed of the loading box.

[0036] Working principle: Place the hard disk loading box on the conveying rod 11, start the universal motor 14 to drive the conveying rod 11 to rotate through the transmission chain 13 and the transmission gear 12 to transport the hard disk loading box. When the loading box reaches between the two sliding seats 701, the electric telescopic rods 702 on both sides are started synchronously to push the sliding seat 701 to slide outside the conveying rod 11, and use the movable flexible wheels 703 to push the loading box in transit to the center position to facilitate subsequent operation steps. When it reaches the cleaning area, start the delivery pump 4 to pump the water in the water tank 3 into the spray pipe 602 through the delivery pipe 5 and spray it through the spray head 603. At the same time, start the drive motors 606 on both sides to rotate the threaded rod 605, drive the sliding member 607 to drive the connecting rod 608 to move, and the sliding rod 609 slides in the sliding hole groove 611, forcing the installation rod rack 610 drives the spray pipe 602 to do circular motion, and through the synchronous coordination of the conveying speed and the cleaning action, it realizes all-round coverage of the grooves, edges and complex structures on the surface of the loading box, eliminates the cleaning blind spots, and improves the cleaning efficiency; the loading box after cleaning falls into the lower hopper 9, and when the loading box contacts the rotating contact plate 810, the rotating contact plate 810 compresses the spring 812 to slide on the outer wall of the arc rod 811, and the elastic action of the spring 812 slows down the falling speed of the loading box to avoid damage caused by collision. At the same time, the air pump 804 and the heating ring 807 are started, and the air pump 804 sends the air filtered by the air filter 805 into the blowing pipe 802 through the connecting pipe 806, and after being heated by the heating ring 807, it is sprayed from the blowing nozzle 803 to the slowly falling loading box, thereby accelerating the drying speed of the loading box.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic cleaning device for a hard disk loading box, comprising a main frame (1), characterized in that: The main frame (1) is provided with a multi-directional spray module (6), and the inner wall of the main frame (1) is fixedly connected to two mutually symmetrical mounting frames (10), and the two mounting frames (10) are provided with the same pusher module (7), and one side of the main frame (1) is connected to a material discharge hopper (9) by bolts, and the material discharge auxiliary module (8) is provided on the material discharge hopper (9), and the multi-directional spray module (6) includes two mutually symmetrical mounting rod frames (610), and the two mounting rod frames (610) are both provided with circular holes, and the same spray pipe is fixedly connected in the two circular holes. (602), a plurality of spray heads (603) are arranged at equal intervals on the spray pipe (602), the pusher module (7) comprises two mutually symmetrical electric telescopic rods (702), and the two electric telescopic rods (702) are fixedly connected to the top of the corresponding mounting frame (10), the unloading auxiliary module (8) comprises a mounting frame (801), the mounting frame (801) is connected to the unloading hopper (9) by bolts, and a blow pipe (802) is fixedly connected to one side of the mounting frame (801), and a plurality of blow nozzles (803) are arranged at equal intervals on the blow pipe (802).

2. The automatic cleaning device for a hard disk loading box according to claim 1, characterized in that: The inner walls of the main frame body (1) on both sides opposite to each other are provided with circular grooves, and a rotating frame (601) is fixedly connected in the two circular grooves. The two mounting rod frames (610) are movably connected to the outside of the corresponding rotating frame (601), and the two mounting rod frames (610) are provided with sliding holes (611) on the opposite sides.

3. The automatic cleaning device for a hard disk loading box according to claim 2, characterized in that: Two fixing members (604) are fixedly connected to the outer walls on both sides opposite to each other of the main frame (1); a plurality of fixing members (604) are provided with rotation holes; threaded rods (605) are rotationally connected to the two corresponding rotation holes via bearings; and drive motors (606) are fixedly connected to the outer walls on both sides opposite to each other of the main frame (1); output ends of the two drive motors (606) are fixedly connected to one end of the corresponding threaded rod (605).

4. The automatic cleaning device for a hard disk loading box according to claim 3, characterized in that: The outsides of the two threaded rods (605) are connected to sliding members (607) via threads, and the two sliding members (607) are fixedly connected to connecting rods (608) on the sides close to each other. The two connecting rods (608) are provided with mounting holes at the ends away from the sliding members (607). The two mounting holes are rotatably connected to sliding rods (609) via bearings, and the two sliding rods (609) slide in corresponding sliding hole grooves (611).

5. The automatic cleaning device for a hard disk loading box according to claim 1, characterized in that: The bottom of the main frame (1) is fixedly connected to a water tank (3), the inner wall of the water tank (3) is fixedly connected to a filter plate (2), and one side of the water tank (3) is fixedly connected to a delivery pump (4), the input end of the delivery pump (4) is fixedly connected to the water tank (3), the output end of the delivery pump (4) is fixedly connected to a delivery pipe (5), and the end of the delivery pipe (5) away from the delivery pump (4) is fixedly connected to one end of the spray pipe (602).

6. The automatic cleaning device for a hard disk loading box according to claim 1, characterized in that: The two mounting frames (10) are provided with movable holes at equal distances, and conveying rods (11) are rotatably connected to the corresponding two movable holes via bearings, one end of each of the plurality of conveying rods (11) is fixedly connected to a transmission tooth (12), and the outside of the plurality of transmission teeth (12) is provided with a common transmission chain (13), and a universal motor (14) is fixedly connected to an inner wall of one side of the main frame (1), and an output end of the universal motor (14) is fixedly connected to one end of the corresponding conveying rod (11).

7. The automatic cleaning device for a hard disk loading box according to claim 6, characterized in that: The pusher module (7) further comprises two sliding seats (701), the two sliding seats (701) both slide outside the corresponding two conveying rods (11), and the driving ends of the two electric telescopic rods (702) are both fixedly connected to the corresponding sliding seats (701), and the inner walls of the two sliding seats (701) are movably connected with a plurality of flexible wheels (703) at equal distances.

8. The automatic cleaning device for a hard disk loading box according to claim 1, characterized in that: The top of the lower hopper (9) is fixedly connected to two symmetrical special-shaped mounting plates (808), the tops of the two special-shaped mounting plates (808) are fixedly connected to mounting rods (809), the outsides of the two mounting rods (809) are movably connected to rotating contact plates (810), and the opposite sides of the two special-shaped mounting plates (808) are fixedly connected to arc-shaped rods (811), the two rotating contact plates (810) slide on the outsides of the corresponding arc-shaped rods (811), the outsides of the two arc-shaped rods (811) are surrounded by springs (812), one end of the two springs (812) is fixedly connected to the corresponding special-shaped mounting plate (808), and the other end is fixedly connected to the corresponding rotating contact plate (810).

9. The automatic cleaning device for a hard disk loading box according to claim 8, characterized in that: An air pump (804) is fixedly connected to one side of the mounting frame (801), and an output end of the air pump (804) is fixedly connected to an air filter (805), an outlet end of the air filter (805) is fixedly connected to a connecting pipe (806), and one end of the connecting pipe (806) away from the air filter (805) is fixedly connected to the blowing pipe (802).

10. The automatic cleaning device for a hard disk loading box according to claim 9, characterized in that: A plurality of heating rings (807) are arranged at equal distances outside the blowing pipe (802), and a plurality of mutually symmetrical baffles (813) are fixedly connected to the top of the lower hopper (9).

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