A heat recovery device for a data center

Abstract

The present invention provides a data center heat recovery device, which relates to the technical field of heat recovery devices, including a water tank, four groups of heating boxes are provided on the top of the water tank, a feed box is installed on the top of the heating box, and an air intake pipe is installed on the top of the feed box, a heat exchange pipe is fixedly inserted at the axis of the heating box, a feed layer is provided between the bottom of the heating box and the water tank, and the feed layer includes an feed box, the top and bottom of the heat exchange pipe are fixedly connected to the feed box and the feed box respectively, and connecting ports are provided inside the feed box and the feed box corresponding to the positions where the heat exchange pipes are inserted. Compared with the prior art, the heat exchange time between hot air and cold water is increased by alternating use of four groups of heating boxes and heat exchange pipes, and hot air can be alternately fed into different heating boxes. The air in the heat exchange pipe in a single cycle is fed into the water tank to preheat the spare water source, thereby improving the efficiency of heat exchange and more fully recovering heat.

Description

Technical Field

[0001] The present invention relates to the technical field of heat recovery devices, and in particular to a heat recovery device for a data center. Background Art

[0002] Data centers are typically equipped with multiple server cabinets, each of which generates a large amount of heat. This heat is dissipated into the data center and then cooled by the data center's refrigeration equipment to achieve heat exchange. However, this heat is usually eventually discharged directly into the atmosphere in the form of hot gas. Since data centers need to operate almost all year round, this results in a large amount of heat resources being wasted.

[0003] Currently, the most common heat recovery method is to use a heat source to heat water and use the hot water for residential use. This technical method requires that hot air be passed into the cold water device. The problem that is prone to occur is: when the water storage space is large, the heat exchange efficiency is low and the water heating speed is slow. When the water storage space is small, the heat exchange efficiency can be improved, but only a small amount of hot air can be exchanged each time, and there will still be a lot of heat that cannot be quickly exchanged and recovered. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a data center heat recovery device to solve the problems raised in the above background technology. The present invention has a novel structure. By alternating the use of four groups of heating boxes and heat exchange tubes, the heat exchange time between hot air and cold water is increased. Hot air can be alternately sent to different heating boxes. The air in the heat exchange tube in a single cycle is sent into the water tank to preheat the backup water source, thereby improving the efficiency of heat exchange and more fully recovering heat.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: a data center heat recovery device, including a water tank, four groups of heating boxes are provided on the top of the water tank, a feed box is installed on the top of the heating box, and an air inlet pipe is installed on the top of the feed box, a heat exchange tube is fixedly plugged into the axis of the heating box, a feed layer is provided between the bottom of the heating box and the water tank, and the feed layer includes a feed box, the top and bottom of the heat exchange tube are fixedly connected to the feed box and the feed box, respectively, and the feed box and the feed box are provided with connection ports at the positions where the heat exchange tubes penetrate, and the positions of the connection ports are fixedly plugged into the axis of the heating box. The sealing is plugged into a sealing plate, and a driving assembly is provided on the outside of the feed box and the feed box, and the driving assembly includes a swivel, and a swivel is rotatably installed on the bottom of the feed box and the feed box, and a gear ring is fixed to the outer end of the swivel, and a second gear is meshed and connected on the same side of the gear ring of the feed box and the feed box, and a shaft is fixed between the two second gears. The positions of the feed box and the feed box corresponding to the connecting port are provided with a linkage assembly, and the linkage assembly includes a push rack, and a push rack is slidably plugged into the surface of the swivel of the feed box and the feed box, and the push rack can squeeze and contact the sealing plate in the connecting port.

[0006] Furthermore, a concentrating pipe is fixed on the top of the water tank, and the top of the concentrating pipe is connected to the center of the delivery box. A condensation layer is fixed on the bottom of the water tank perpendicular to the concentrating pipe, and an exhaust pipe is provided at the bottom of the condensation layer.

[0007] Furthermore, a plurality of groups of U-shaped tubes are provided inside the water tank, and both ends of the U-shaped tubes are respectively connected to the centralizing tube and the condensation layer, and a water inlet pipe is provided on one side of the surface of the water tank.

[0008] Furthermore, the top of the water tank is located on the periphery of the central pipe and is connected to a water supply pipe through a water pump, and the water supply pipe is connected to four groups of heating boxes respectively. A drainage pipe is provided on the bottom outer surface of the heating box, and the inner diameter of the heat exchange pipe is larger than the connection port.

[0009] Furthermore, a vertical rod is fixed inside the heat exchange tube, and the sealing plate in the connection port is slidably sleeved on the vertical rod. The vertical rod is located on the inner side of the sealing plate and is sleeved with a spring, and the other end of the spring is fixedly connected to the sealing plate.

[0010] Furthermore, air outlets are provided at positions corresponding to the four connection ports inside the delivery box, and the air outlets are connected to the air inlet pipe. An air outlet pipe controlled by a solenoid valve is installed at the other end of the air inlet pipe.

[0011] Furthermore, the drive assembly also includes a drive motor, the drive motor is fixed to one side of the feeding box, and a first gear is fixed to the output end of the drive motor, and the first gear is meshed and connected with the other side of the gear ring.

[0012] Furthermore, the linkage assembly also includes a connecting frame, a connecting frame is fixed on the outside of the push frame of the feeding box and the sending box, and the outer ends of the connecting frame are in the same straight line, a vertical frame is provided between the two connecting frames, and a bidirectional screw rod is rotatably installed on the surface of the vertical frame, and the connecting frame is respectively threadedly sleeved on the two ends of the bidirectional screw rod.

[0013] Furthermore, a fixing frame is fixed to the bottom of the vertical frame, and the fixing frame is fixedly connected to the swivel of the delivery box.

[0014] Furthermore, the rotation range of the bidirectional screw and the vertical frame exceeds the position of the second gear and the shaft, and the positions of the connecting frames of the feeding box and the sending box are both beyond the upper and lower ends of the second gear.

[0015] Beneficial effects of the present invention:

[0016] 1. In the normal state of the present invention, the sealing plates at both ends of the vertical rod respectively cover the two connecting ports. This process can be used to seal and stay the hot air after it is sent into the heat exchange tube, giving the hot air and cold water time for heat exchange. The motor drives the first gear to rotate and engage with the gear ring on the rotating ring of the feed box, and then through the transmission of the second gear and the shaft, the upper and lower sets of rotating rings rotate synchronously, and the push rack also rotates synchronously. The positions corresponding to the push racks in the feed box and the delivery box are adjacent to each other. The heat exchange tube corresponding to the push rack in the feed box is about to be fed with hot air, and the connection port corresponding to the push rack in the delivery box is for exhausting the air immediately. Driven by the driving component, the two alternately supply and exhaust air to the four groups of heat exchange tubes, giving time for heat exchange while alternately feeding hot air into the four groups of heating boxes.

[0017] 2. The present invention avoids the positions of the first gear, the second gear and the shaft rod when the rotating ring rotates through the position of the connecting frame and the bidirectional screw, thereby avoiding movement interference due to the existence of the connecting frame. The shaft rod or the second gear can be rotatably installed on the outer wall of the heating box through the bearing seat.

[0018] 3. In the present invention, some heat in the air sent out from the heat exchange tube is not completely exchanged, and the air is sent into the U-shaped tube inside the water tank, through which the spare water source in the water tank is preheated, and the heat source is exchanged for the second time, and finally sent into the condensation layer. The condensation layer contains a condensation and cooling device, which detects the air temperature. When the appropriate temperature is reached, the air can be sent out directly from the exhaust pipe. If the temperature is still high, it can be cooled by the condensation device before being sent out.

[0019] 4. Compared with the prior art, the present invention increases the heat exchange time between hot air and cold water by alternately using four groups of heating boxes and heat exchange tubes. Hot air can be alternately sent to different heating boxes. The air in the heat exchange tubes in a single cycle is sent into the water tank to preheat the backup water source, thereby improving the efficiency of heat exchange and more fully recovering heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a heat recovery device for a data center according to the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of a water tank of a data center heat recovery device according to the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of a drive component of a heat recovery device for a data center according to the present invention;

[0023] Figure 4 This is a schematic diagram of the linkage component structure of a data center heat recovery device of the present invention;

[0024] Figure 5 This is a schematic diagram of the internal structure of a heat exchange tube of a data center heat recovery device according to the present invention;

[0025] Figure 6 This is a schematic diagram of the internal structure of a feed box of a data center heat recovery device according to the present invention.

[0026] In the figure: 1. Water tank; 11. Water inlet pipe; 12. Exhaust pipe; 13. Condensation layer; 14. U-shaped pipe; 15. Water supply pipe; 2. Delivery layer; 21. Concentrating pipe; 22. Delivery box; 3. Heating box; 31. Drain pipe; 32. Heat exchange tube; 33. Vertical rod; 34. Spring; 35. Sealing plate; 4. Delivery box; 41. Inlet pipe; 42. Outlet pipe; 43. Rotating ring; 44. Outlet; 45. Connecting port; 5. Driving assembly; 51. Driving motor; 52. First gear; 53. Gear ring; 54. Second gear; 55. Shaft; 6. Linkage assembly; 61. Connecting frame; 62. Vertical frame; 63. Bidirectional screw rod; 64. Fixed frame; 65. Push frame. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0028] See also Figures 1 to 6The present invention provides a technical solution: a heat recovery device for a data center, comprising a water tank 1, wherein four groups of heating boxes 3 are provided on the top of the water tank 1, a feed box 4 is installed on the top of the heating box 3, and an air inlet pipe 41 is installed on the top of the feed box 4, a heat exchange tube 32 is fixedly plugged into the axis of the heating box 3, a delivery layer 2 is provided between the bottom of the heating box 3 and the water tank 1, and the delivery layer 2 includes a delivery box 22, the top and bottom of the heat exchange tube 32 are fixedly connected to the feed box 4 and the delivery box 22 respectively, and a connecting port 45 is provided inside the feed box 4 and the delivery box 22 corresponding to the position where the heat exchange tube 32 penetrates, and a sealing plate 35 is sealed and plugged into the position of the connecting port 45, a driving assembly 5 is provided on the outside of the feed box 4 and the delivery box 22, and the driving assembly 5 includes a swivel 43, and a swivel 43 is rotatably installed on the bottom of the feed box 4 and the delivery box 22, and the swivel 4 A gear ring 53 is fixed to the outer end of 3, and a second gear 54 is meshed with each other on the same side of the gear ring 53 of the feed box 4 and the feed box 22, and a shaft 55 is fixed between the two second gears 54. A linkage component 6 is provided at the position of the feed box 4 and the feed box 22 corresponding to the connection port 45, and the linkage component 6 includes a push rack 65. Push racks 65 are slidably inserted on the surface of the rotating ring 43 of the feed box 4 and the feed box 22, and the push rack 65 can squeeze and contact the sealing plate 35 in the connection port 45. When using the device, the device is set inside or outside the machine room, and the cabinet of the data center is connected to the air inlet pipe 41 through a pipe. Then the hot air is sucked into the interior of the device through the fan, and the first heat exchange is performed with the water in the heating box 3 inside the heat exchange pipe 32, and then it is sent to the inside of the water tank 1 to preheat the backup water source for secondary heat exchange, and fully recover the heat in the air.

[0029] In this embodiment, a centralizing pipe 21 is fixed on the top of the water tank 1, and the top of the centralizing pipe 21 is connected to the center of the delivery box 22. A condensation layer 13 is fixed at the bottom of the water tank 1 perpendicular to the centralizing pipe 21, and an exhaust pipe 12 is provided at the bottom of the condensation layer 13. A plurality of groups of U-shaped pipes 14 are provided inside the water tank 1, and the two ends of the U-shaped pipes 14 are respectively connected to the centralizing pipe 21 and the condensation layer 13. A water inlet pipe 11 is provided on one side of the surface of the water tank 1. The top of the water tank 1 is located at the periphery of the centralizing pipe 21 and is connected to a water delivery pipe 15 through a water pump, and the water delivery pipe 15 is respectively connected to the four groups of heating boxes. 3 connection, a drain pipe 31 is provided on the outer surface of the bottom of the heating box 3, the inner diameter of the heat exchange pipe 32 is larger than the connection port 45, and some heat of the air sent out from the heat exchange pipe 32 is not completely exchanged, and is sent to the U-shaped pipe 14 inside the water tank 1, and the backup water source in the water tank 1 is preheated through the U-shaped pipe 14, and the heat source is exchanged twice, and finally sent to the inside of the condensation layer 13, which contains a condensation and cooling device to detect the air temperature. When the air reaches a suitable temperature, it can be sent out directly from the exhaust pipe 12. If the temperature is still high, it can be sent out after being cooled by the condensation device.

[0030] In this embodiment, a vertical rod 33 is fixed inside the heat exchange tube 32, and the sealing plate 35 in the connecting port 45 is slidably sleeved on the vertical rod 33. The vertical rod 33 is located on the inner side of the sealing plate 35 and is sleeved with a spring 34, and the other end of the spring 34 is fixedly connected to the sealing plate 35. The driving assembly 5 also includes a driving motor 51. A driving motor 51 is fixed to one side of the feeding box 4, and a first gear 52 is fixed to the output end of the driving motor 51. The first gear 52 is meshed with the other side of the gear ring 53. The linkage assembly 6 also includes a connecting frame 61. A connecting frame 61 is fixed to the outside of the pushing frame 65 of the feeding box 4 and the sending box 22, and the outer ends of the connecting frame 61 are in the same straight line. A vertical frame 62 is provided between the two connecting frames 61, and the vertical frame 62 represents A two-way screw rod 63 is rotatably installed on the surface, and the connecting frame 61 is respectively threadedly sleeved on the two ends of the two-way screw rod 63. A fixing frame 64 is fixed to the bottom of the vertical frame 62, and the fixing frame 64 is fixedly connected to the rotating ring 43 of the delivery box 22. The rotation range of the two-way screw and the vertical frame 62 exceeds the position of the second gear 54 and the shaft 55. The position of the connecting frame 61 of the delivery box 4 and the delivery box 22 exceeds the upper and lower ends of the second gear 54. The structure of the delivery box 4 and the delivery box 22 is basically the same. Both have a rotating ring 43 and a gear ring 53, and there is a push frame 65 on the rotating ring 43. Under normal conditions, the sealing plates 35 at both ends of the vertical rod 33 respectively block the two connecting ports 45. This process can be used to seal and stay the hot air after it is delivered to the heat exchange tube 32, giving heat During the heat exchange time between air and cold water, the motor drives the first gear 52 to rotate and mesh with the gear ring 53 on the rotating ring 43 of the feeding box 4, and then the second gear 54 and the shaft 55 drive the upper and lower sets of rotating rings 43 to rotate synchronously, and the push rack 65 also rotates synchronously. The corresponding positions of the push racks 65 in the feeding box 4 and the sending box 22 are two adjacent ones. The heat exchange pipe 32 corresponding to the push rack 65 in the feeding box 4 is about to be fed with hot air, and the connection port 45 corresponding to the push rack 65 in the sending box 22 is for immediately discharging the air. Driven by the driving component 5, the two alternately supply and exhaust the four sets of heat exchange pipes 32, giving the heat exchange time while alternately feeding hot air into the four sets of heating boxes 3. The advantage of doing this is that: the heat exchange pipe 32 is sealed Although most of the heat in the air can be absorbed by the cold water, without subsequent heating, the air temperature will continue to drop and the heat exchange efficiency will also decrease. Therefore, this method is also a kind of intermittent continuous heating to maintain efficient heat exchange in the heating box 3. The motor drives the rotation of the two-way screw 63. The two connecting frames 61 and the two-way screw 63 are threaded together to drive their respective push frames 65 to squeeze the sealing plate 35. Because the inner diameter of the connecting port 45 is smaller than the heat exchange tube 32, when the sealing plate 35 moves inward, the heat exchange tube 32 will be opened to facilitate the supply and discharge of air. The position of the connecting frame 61 and the two-way screw 63 will avoid the position of the first gear 52, the second gear 54 and the shaft 55 when the rotating ring 43 rotates, avoiding movement interference due to the existence of the connecting frame 61.The shaft 55 or the second gear 54 can be rotatably mounted on the outer wall of the heating box 3 through a bearing seat.

[0031] In this embodiment, air outlets 44 are provided at positions corresponding to the four connecting ports 45 inside the delivery box 4, and the air outlets 44 are connected to the air inlet pipe 41. The other end of the air inlet pipe 41 is equipped with an air outlet pipe 42 controlled by a solenoid valve. The four air outlets 44 of the delivery box 4 correspond to the connecting ports 45, which facilitates the entry of hot air into the heat exchange tube 32. The air outlet pipe 42 can be directly used for residents' daily life, such as floor heating or other heating methods, and can also be sent into the interior of the device to heat water.

[0032] When the device is used, it is set inside or outside the machine room, and the cabinet in the data center is connected to the air inlet pipe 41 through a pipe. Then the hot air is sucked into the interior of the device through the fan, and the first heat exchange is performed with the water in the heating box 3 inside the heat exchange tube 32. Under normal conditions, the sealing plates 35 at both ends of the vertical rod 33 respectively cover the two connecting ports 45. This process can be used to seal and stop the hot air after it is sent into the heat exchange tube 32, giving the hot air and cold water time to exchange heat. The motor drives the first gear 52 to rotate and the gear ring on the rotating ring 43 of the feeding box 4 is connected. 53 meshes, and then through the transmission of the second gear 54 and the shaft 55, the upper and lower sets of rotating rings 43 rotate synchronously, and the push rack 65 also rotates synchronously. The positions corresponding to the push racks 65 in the input box 4 and the output box 22 are two adjacent ones. The heat exchange pipe 32 corresponding to the push rack 65 in the input box 4 is about to be fed with hot air, and the connection port 45 corresponding to the push rack 65 in the output box 22 is immediately discharged. Driven by the driving component 5, the two alternately supply and exhaust the four sets of heat exchange pipes 32, giving the heat exchange time while alternating the four sets of heating boxes 3. Hot air is sent in. The advantage of doing so is that although the air sealed in the heat exchange tube 32 can absorb most of the heat by the cold water, without subsequent heating, the air temperature will continue to drop and the heat exchange efficiency will also decrease. Therefore, this method is also a kind of intermittent continuous heating to maintain efficient heat exchange in the heating box 3. The motor drives the rotation of the bidirectional screw 63. The two connecting frames 61 and the bidirectional screw 63 are threaded together to drive their respective push frames 65 to squeeze the sealing plate 35. Because the inner diameter of the connecting port 45 is smaller than the heat exchange tube 32, when the sealing plate 35 moves inward, The heat exchange tube 32 will be opened to facilitate the supply and discharge of air. Some heat in the air sent out from the heat exchange tube 32 is not completely exchanged, and is sent into the U-shaped tube 14 inside the water tank 1. The backup water source in the water tank 1 is preheated through the U-shaped tube 14, and the heat source is exchanged twice. Finally, it is sent into the condensation layer 13. The condensation layer 13 contains a condensation and cooling device to detect the air temperature. When the appropriate temperature is reached, it can be sent out directly from the exhaust pipe 12. If the temperature is still high, it can be sent out after being cooled by the condensation device, so as to fully recover the heat in the air.

[0033] The basic principles, main features and advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention.

[0034] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A data center heat recovery device, comprising a water tank (1), characterized in that: The water tank (1) is provided with four groups of heating boxes (3) on the top, a feeding box (4) is installed on the top of the heating box (3), and an air inlet pipe (41) is installed on the top of the feeding box (4), a heat exchange pipe (32) is fixedly plugged in at the axis of the heating box (3), a feeding layer (2) is provided between the bottom of the heating box (3) and the water tank (1), and the feeding layer (2) includes a feeding box (22), the top and bottom of the heat exchange pipe (32) are fixedly connected to the feeding box (4) and the feeding box (22), respectively, and a connecting port (45) is provided inside the feeding box (4) and the feeding box (22) at a position corresponding to the insertion of the heat exchange pipe (32), and a sealing plate (35) is sealed and plugged in at the position of the connecting port (45), and a driving assembly (5) is provided on the outside of the feeding box (4) and the feeding box (22). ), the driving assembly (5) includes a rotating ring (43), the top of the feeding box (4) and the bottom of the delivery box (22) are both rotatably mounted with a rotating ring (43), and a gear ring (53) is fixed to the outer end of the rotating ring (43), the gear rings (53) of the feeding box (4) and the delivery box (22) are meshed and connected with a second gear (54) on the same side, and a shaft (55) is fixed between the two second gears (54), and the feeding box (4) and the delivery box (22) are provided with a linkage assembly (6) at the position corresponding to the connection port (45), and the linkage assembly (6) includes a push frame (65), and the push frame (65) is slidably inserted on the surface of the rotating ring (43) of the feeding box (4) and the delivery box (22), and the push frame (65) can press and contact the sealing plate (35) in the connection port (45).

2. A data center heat recovery device according to claim 1, characterized in that: A centralizing pipe (21) is fixed on the top of the water tank (1), and the top of the centralizing pipe (21) is connected to the center of the delivery box (22). A condensation layer (13) is fixed at a position perpendicular to the centralizing pipe (21) on the bottom of the water tank (1), and an exhaust pipe (12) is provided at the bottom of the condensation layer (13).

3. The data center heat recovery device according to claim 2, characterized in that: A plurality of groups of U-shaped tubes (14) are provided inside the water tank (1), and both ends of the U-shaped tubes (14) are respectively connected to the centralizing tube (21) and the condensation layer (13). A water inlet pipe (11) is provided on one side of the surface of the water tank (1).

4. The data center heat recovery device according to claim 3, characterized in that: The top of the water tank (1) is located outside the central pipe (21) and is connected to a water supply pipe (15) via a water pump. The water supply pipe (15) is connected to four groups of heating boxes (3) respectively. A drainage pipe (31) is provided on the outer surface of the bottom of the heating box (3). The inner diameter of the heat exchange pipe (32) is larger than the connection port (45).

5. The data center heat recovery device according to claim 4, characterized in that: A vertical rod (33) is fixed inside the heat exchange tube (32), and a sealing plate (35) in the connection port (45) is slidably sleeved on the vertical rod (33). The vertical rod (33) is located on the inner side of the sealing plate (35) and is sleeved with a spring (34), and the other end of the spring (34) is fixedly connected to the sealing plate (35).

6. The data center heat recovery device according to claim 1, characterized in that: An air outlet (44) is provided at positions corresponding to the four connecting ports (45) inside the delivery box (4), and the air outlet (44) is communicated with the air inlet pipe (41). An air outlet pipe (42) controlled by a solenoid valve is installed at the other end of the air inlet pipe (41).

7. The data center heat recovery device according to claim 1, characterized in that: The driving assembly (5) further comprises a driving motor (51), one side of the feeding box (4) is fixed with the driving motor (51), and the output end of the driving motor (51) is fixed with a first gear (52), and the first gear (52) is meshedly connected with the other side of the gear ring (53).

8. The data center heat recovery device according to claim 7, characterized in that: The linkage assembly (6) further comprises a connecting frame (61), the connecting frame (61) being fixed on the outside of the push frame (65) of the feeding box (4) and the sending box (22), and the outer ends of the connecting frame (61) are on the same straight line, a vertical frame (62) is provided between the two connecting frames (61), and a bidirectional screw rod (63) is rotatably mounted on the surface of the vertical frame (62), and the connecting frame (61) is respectively threadedly sleeved on the two ends of the bidirectional screw rod (63).

9. The data center heat recovery device according to claim 8, characterized in that: A fixing frame (64) is fixed to the bottom of the vertical frame (62), and the fixing frame (64) is fixedly connected to the rotating ring (43) of the delivery box (22).

10. The data center heat recovery device according to claim 9, characterized in that: The rotation range of the bidirectional screw rod (63) and the vertical frame (62) exceeds the position of the second gear (54) and the shaft (55), and the positions of the connecting frame (61) of the feeding box (4) and the sending box (22) are both beyond the upper and lower ends of the second gear (54).

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