A microbial leaching apparatus for apatite tailings
By combining preliminary spraying and reciprocating spraying with dispersion and sampling functions in the microbial leaching device for apatite tailings, the problems of high machine wear and low efficiency of existing devices have been solved, and efficient leaching treatment has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JINGGANGSHAN UNIVERSITY
- Filing Date
- 2023-10-31
- Publication Date
- 2026-05-01
AI Technical Summary
Existing microbial leaching devices for apatite tailings suffer from high machine wear and tear during the treatment process, poor single-spray effect, and the need to wait for reaction time, resulting in low efficiency.
The process involves initial spraying during material feeding, and the second spraying component is moved back and forth by a drive motor driving a reciprocating screw. Combined with the staggered distribution of the dispersing frame and the sample extraction of the sampling frame, multiple spraying and thorough dispersing are achieved.
It improves the leaching effect of apatite tailings, avoids adhesion, ensures sufficient reaction time, and improves treatment efficiency and effectiveness.
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Figure CN117443912B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of mineral processing, and more particularly to a microbial leaching device for apatite tailings. Background Technology
[0002] Apatite tailings refer to the waste or byproducts generated during apatite ore mining and phosphate fertilizer production. Microbial leaching, also known as bioleaching or bio-leaching, is a biotechnology process used to extract metals or other useful substances from ores or solid waste. This process utilizes the metabolic activities of microorganisms to dissolve, leach, or separate the target substance from the ore or solid waste. Existing equipment typically treats apatite tailings by direct spraying, often combined with shaking or stirring to ensure thorough leaching. However, this method results in significant machine wear and tear, and a single spraying session can lead to poor leaching efficiency. Furthermore, the time required for each spraying session further reduces efficiency.
[0003] Therefore, a microbial leaching device for apatite tailings is being developed that performs preliminary spraying treatment during the feeding process and reciprocating moving spraying in subsequent processes. Summary of the Invention
[0004] To overcome the shortcomings of existing devices, such as high machine wear and tear, poor leaching effect due to single spraying, and reduced efficiency due to the waiting time required for each spray, this invention provides a microbial leaching device for apatite tailings that performs preliminary spraying during the feeding process and reciprocating spraying in subsequent processes.
[0005] The technical solution of the present invention is as follows: a microbial leaching device for apatite tailings, comprising a conveying component, a feeding frame, a liquid storage component, a first spraying component, a second spraying component, and a reciprocating mechanism. The feeding frame is connected to the left side of the conveying component, the liquid storage component is connected to the middle of the conveying component, the first spraying component is connected between the liquid storage component and the feeding frame, and the second spraying component is connected between the liquid storage component and the conveying component. The reciprocating mechanism is provided on the conveying component, and the reciprocating mechanism includes a drive motor, a reciprocating screw, a first moving part, and a limiting frame. The drive motor is connected to the front side of the middle of the conveying component, the reciprocating screw is connected to the output shaft of the drive motor, and the limiting frame is connected to the upper rear side of the conveying component. The limiting frame is rotatably connected to the reciprocating screw, the first moving part is threadedly connected to the reciprocating screw, the first moving part is connected to the second spraying component, and the first moving part is slidably connected to the conveying component.
[0006] As a preferred technical solution of the present invention, it further includes a disintegration mechanism, which includes a limiting seat, a disintegration frame, a first rack, a rotating component, and a protective frame. The front and rear sides of the feeding frame are connected to the limiting seat, the upper and lower parts of the feeding frame are slidably connected to the disintegration frame, the front and rear sides of the disintegration frame are connected to the first rack, the limiting seat is connected to the rotating component, and the front and rear sides of the feeding frame are connected to the protective frame.
[0007] As a preferred technical solution of the present invention, it further includes a sampling mechanism, which includes a limiting member, a sampling frame and a connecting frame. The right inner side of the conveying component is connected to two limiting members, and the sampling frame is slidably connected to each limiting member. The top of the sampling frame is connected to the connecting frame.
[0008] As a preferred embodiment of the present invention, it further includes an adjustment mechanism, which includes a first fixed frame, a second rack, a gear ring, a rotating rod, and a mounting base. The first fixed frame is connected to the top of the first moving part. The second rack is connected to both the front and rear sides of the first fixed frame. The rotating rod is rotatably connected to both the front and rear sides of the liquid storage component. The gear ring is connected to both the left and right sides of the rotating rod. The gear ring on the left side meshes with the first rack, and the gear ring on the right side meshes with the second rack. The mounting base is bolted to both the front and rear sides of the right side of the feeding frame. The mounting base is rotatably connected to the adjacent rotating rod.
[0009] As a preferred embodiment of the present invention, it further includes a lifting mechanism, which includes a second fixed frame, a second movable member, a third fixed frame, a rotating plate, and pins. The second fixed frame is connected to the left side of the connecting frame, the second movable member is slidably connected to the second fixed frame, the third fixed frame is connected to the first fixed frame, the third fixed frame is in contact with the second movable member, the rotating plate is rotatably connected to the rear side of the third fixed frame, and two pins, one above the other, are slidably connected to the third fixed frame.
[0010] As a preferred embodiment of the present invention, it further includes a cover plate mechanism, which includes a fixed seat and a flip cover plate. The fixed seat is connected to the upper part of the feeding frame, and the flip cover plate is rotatably connected to the fixed seat.
[0011] As a preferred embodiment of the present invention, the conveying assembly includes a mounting frame, a drive roller, a driven roller, and a conveyor belt. The drive roller is rotatably connected to the left side of the mounting frame, and the driven roller is rotatably connected to the right side of the mounting frame. The conveyor belt is wound between the drive roller and the driven roller.
[0012] As a preferred embodiment of the present invention, the rotating assembly includes a long rotating shaft, a short rotating shaft, and gears. The long rotating shaft is rotatably connected to the limiting seat, and gears are connected to both the upper and lower ends of the long rotating shaft. The gears on the lower side of the long rotating shaft mesh with the first rack on the lower side. The short rotating shaft is rotatably connected to the upper part of the limiting seat, and gears are also connected to both the upper and lower sides of the short rotating shaft. The gears on the lower side of the short rotating shaft mesh with the gears on the upper side of the long rotating shaft, and the gears on the upper side of the short rotating shaft mesh with the first rack on the upper side.
[0013] Beneficial effects: 1. The present invention performs two spraying treatments through the first spraying component and the second spraying component. After the first spraying is completed, sufficient reaction time is provided. At the same time, the output shaft of the drive motor drives the reciprocating screw to rotate, so that the first moving part can drive the second spraying component to move back and forth. Thus, when the apatite tailings pass by, reciprocating spraying treatment can be performed, thereby improving the spraying and filtration effect.
[0014] 2. This invention pushes and adjusts the lower first rack so that the upper first rack can move in opposite directions with the lower first rack, thereby making the two dispersing frames form an interleaved distribution, dispersing the apatite tailings passing through the feeding frame and preventing the apatite tailings from sticking together.
[0015] 3. This invention lifts the sampling frame upwards by pulling the connecting frame, thereby enabling sample extraction as the apatite tailings pass by. The analysis of the sample determines whether the sprayed apatite tailings meet the requirements.
[0016] 4. The present invention drives the first moving part to reciprocate back and forth by a reciprocating screw, thereby causing the disintegrating frame to reciprocate back and forth intermittently, so as to fully disintegrate the apatite tailings passing through the feeding frame. Attached Figure Description
[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0018] Figure 2 This is a partial three-dimensional structural schematic diagram of the present invention.
[0019] Figure 3 This is a three-dimensional structural diagram of the reciprocating mechanism of the present invention.
[0020] Figure 4 This is a schematic diagram of the reciprocating mechanism of the present invention.
[0021] Figure 5 This is a partial cross-sectional three-dimensional structural schematic diagram of the disintegration mechanism of the present invention.
[0022] Figure 6 This is a three-dimensional structural diagram of the sampling mechanism of the present invention.
[0023] Figure 7 This is a three-dimensional structural diagram of the adjustment mechanism of the present invention.
[0024] Figure 8 This is a three-dimensional structural diagram of the lifting mechanism of the present invention.
[0025] Figure 9 This is a partial three-dimensional structural diagram of the lifting mechanism of the present invention.
[0026] Figure 10 This is a three-dimensional structural diagram of the cover plate mechanism of the present invention.
[0027] The components in the diagram are labeled as follows: 1-Conveying assembly, 2-Discharging frame, 3-Liquid storage assembly, 4-First spraying assembly, 5-Second spraying assembly, 6-Reciprocating mechanism, 61-Drive motor, 62-Reciprocating lead screw, 63-First moving part, 64-Limiting frame, 7-Dispersing mechanism, 71-Limiting seat, 72-Dispersing frame, 73-First rack, 74-Rotating assembly, 75-Protective frame, 8-Sampling mechanism, 81-Limiting part, 82-Sampling frame, 83-Connecting frame, 9-Adjusting mechanism, 91-First fixed frame, 92-Second rack, 93-Gear ring, 94-Rotating rod, 95-Mounting seat, 10-Lifting mechanism, 101-Second fixed frame, 102-Second moving part, 103-Third fixed frame, 104-Rotating plate, 105-Pin, 11-Cover mechanism, 111-Fixed seat, 112-Flip cover. Detailed Implementation
[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the scope of protection and application of the present invention.
[0029] A microbial leaching device for apatite tailings, such as Figure 1 and Figure 2 As shown, the assembly includes a conveying component 1, a feeding frame 2, a liquid storage component 3, a first spraying component 4, a second spraying component 5, and a reciprocating mechanism 6. The conveying component 1 includes a mounting frame, a drive roller, a driven roller, and a conveyor belt. The drive roller is rotatably connected to the left side of the mounting frame, and the driven roller is rotatably connected to the right side of the mounting frame. A conveyor belt is wound between the drive roller and the driven roller. The feeding frame 2 is connected to the left side of the conveying component 1, and the liquid storage component 3 is connected to the middle of the conveying component 1. The first spraying component 4 is connected between the liquid storage component 3 and the feeding frame 2, and the second spraying component 5 is connected between the liquid storage component 3 and the conveying component 1. The conveying component 1 is equipped with a reciprocating mechanism 6 for reciprocating and fully spraying the apatite tailings.
[0030] It should be noted that this device can be used to process apatite tailings. First, the apatite tailings are poured into the feeding frame 2. After entering the feeding frame 2, the apatite tailings undergo preliminary spraying treatment by the first spraying component 4. Then, the apatite tailings move through the feeding frame 2 to the conveying component 1. The conveying component 1 is then activated to transport the apatite tailings to the right. During the movement to the right, the apatite tailings are sprayed again by the second spraying component 5. At the same time, the reciprocating mechanism 6 is activated, enabling the second spraying component 5 to perform reciprocating spraying, achieving double spraying filtration and improving the spraying filtration effect.
[0031] like Figure 1 , Figure 3 and Figure 4 As shown, the reciprocating mechanism 6 includes a drive motor 61, a reciprocating lead screw 62, a first moving part 63, and a limiting frame 64. The drive motor 61 is connected to the front side of the middle part of the conveying assembly 1. The output shaft of the drive motor 61 is arranged in a rearward direction. The reciprocating lead screw 62 is connected to the output shaft of the drive motor 61. The limiting frame 64 is connected to the upper rear part of the conveying assembly 1. The limiting frame 64 is rotatably connected to the reciprocating lead screw 62. The first moving part 63 is threadedly connected to the reciprocating lead screw 62. The first moving part 63 is connected to the second spraying assembly 5 and is slidably connected to the conveying assembly 1.
[0032] It should be noted that when using the second spraying assembly 5 to spray the apatite tailings, the drive motor 61 is started simultaneously. The rotation of the output shaft of the drive motor 61 drives the reciprocating screw 62 to start rotating, thereby causing the first moving part 63 to drive the second spraying assembly 5 to move back and forth along the conveying assembly 1, thus performing reciprocating spraying treatment on the passing apatite tailings, improving the spraying treatment effect, and enabling the apatite tailings to undergo sufficient microbial leaching. In summary, by driving the reciprocating screw 62 to rotate through the output shaft of the drive motor 61, the first moving part 63 can drive the second spraying assembly 5 to move back and forth, thereby performing reciprocating spraying treatment on the passing apatite tailings and improving the spraying filtration effect.
[0033] like Figure 1 and Figure 5As shown, it also includes a dispersing mechanism 7, which includes a limiting seat 71, a dispersing frame 72, a first rack 73, a rotating assembly 74, and a protective frame 75. The front and rear sides of the feeding frame 2 are connected to the limiting seat 71. The upper and lower parts of the feeding frame 2 are slidably connected to the dispersing frame 72 for dispersing the apatite tailings. The front and rear sides of the dispersing frame 72 are connected to the first rack 73. The limiting seat 71 is connected to a rotating assembly 74 for adjusting the forward and backward movement of the adjacent first rack 73. Component 74 includes a long rotating shaft, a short rotating shaft, and gears. The long rotating shaft is rotatably connected to the limiting seat 71. Gears are connected to both the upper and lower ends of the long rotating shaft. The gears on the lower side of the long rotating shaft mesh with the first rack 73 on the lower side. The short rotating shaft is rotatably connected to the upper part of the limiting seat 71. Gears are also connected to both the upper and lower sides of the short rotating shaft. The gears on the lower side of the short rotating shaft mesh with the gears on the upper side of the long rotating shaft. The gears on the upper side of the short rotating shaft mesh with the first rack 73 on the upper side. Protective frames 75 are connected to both the front and rear sides of the feeding frame 2.
[0034] It should be noted that, in order to prevent the apatite tailings from agglomerating when passing through the feeding frame 2, thus reducing the initial spraying effect, the position of the lower dispersing frame 72 can be adjusted by pushing the lower first toothed rack 73. Under the action of the rotating component 74, the upper first toothed rack 73 and the lower first toothed rack 73 move in opposite directions, forming an interlaced state. The interlaced dispersing frame 72 then disperses the apatite tailings, allowing them to pass through the feeding frame 2 in a dispersed manner, thereby improving the initial spraying effect. In summary, by pushing and adjusting the lower first toothed rack 73, the upper first toothed rack 73 and the lower first toothed rack 73 can move in opposite directions, thus forming an interlaced state for the two dispersing frames 72 to disperse the apatite tailings passing through the feeding frame 2, preventing the apatite tailings from agglomerating.
[0035] like Figure 1 and Figure 6 As shown, it also includes a sampling mechanism 8, which includes a limiting member 81, a sampling frame 82 and a connecting frame 83. The right inner side of the conveying component 1 is connected to two limiting members 81, and each limiting member 81 is slidably connected to a sampling frame 82 for sampling apatite tailings. The top of the sampling frame 82 is connected to the connecting frame 83.
[0036] It should be noted that after the apatite tailings undergo two spraying treatments, as the apatite tailings continue to move to the right under the drive of the conveyor component 1, the apatite tailings will pass through the sampling frame 82. When the apatite tailings pass through the sampling frame 82, the operator can pull the connecting frame 83, causing the connecting frame 83 to slide the sampling frame 82 upwards, thereby raising the sampling frame 82 and extracting a portion of the apatite tailings. Afterwards, the operator can test the extracted apatite tailings sample to determine whether the condition of the apatite tailings meets the standards. If the apatite tailings do not meet the standards, the spraying operation needs to be repeated. In summary, by pulling the connecting frame 83 to raise the sampling frame 82 upwards, samples can be extracted when the apatite tailings pass through, and the samples can be analyzed to determine whether the sprayed apatite tailings meet the requirements.
[0037] like Figure 1 and Figure 7 As shown, it also includes an adjustment mechanism 9, which includes a first fixed frame 91, a second rack 92, a gear ring 93, a rotating rod 94, and a mounting base 95. The top of the first moving part 63 is connected to the first fixed frame 91, and the first fixed frame 91 is connected to the second rack 92 on both the front and rear sides. The liquid storage component 3 is rotatably connected to the rotating rod 94 on both the front and rear sides. The rotating rod 94 is connected to the gear ring 93 on both the left and right sides. The gear ring 93 on the left side meshes with the first rack 73, and the gear ring 93 on the right side meshes with the second rack 92. The right side of the feeding frame 2 is connected to the mounting base 95 on both the front and rear sides by bolts. The mounting base 95 is rotatably connected to the adjacent rotating rod 94.
[0038] It should be noted that as the reciprocating screw 62 begins to rotate, the first moving part 63 begins to reciprocate. At this time, the first moving part 63 drives the first fixed part to reciprocate synchronously. During this process, the first fixed frame 91 drives the second rack 92 to reciprocate as well. The front second rack 92 first drives the front right gear ring 93 to rotate, thereby causing the front rotating rod 94 to drive the front left gear ring 93 to rotate. This causes the disintegrating frame 72 to begin a position adjustment. When the first fixed frame 91 continues to move backward, and the front second rack 92 no longer meshes with the front right gear ring 93, the disintegrating frame 72... When the disintegrating frame 72 stops moving, the second rack 92 on the rear side begins to mesh with the gear ring 93 on the rear right side. Driven by the second rack 92, the rotating rod 94 on the rear side begins to rotate, thereby causing the disintegrating frame 72 to begin to move in the opposite direction for adjustment. That is, during the reciprocating motion of the first moving part 63 driven by the reciprocating screw 62, the disintegrating frame 72 will intermittently perform back-and-forth reciprocating motion to improve the disintegration effect. In summary, by driving the first moving part 63 to perform back-and-forth reciprocating motion through the reciprocating screw 62, the disintegrating frame 72 will intermittently perform back-and-forth reciprocating motion to fully disintegrate the apatite tailings passing through the feeding frame 2.
[0039] like Figure 1 , Figure 8 and Figure 9 As shown, it also includes a lifting mechanism 10, which includes a second fixed frame 101, a second movable member 102, a third fixed frame 103, a rotating plate 104, and pins 105. The second fixed frame 101 is connected to the left side of the connecting frame 83. The second movable member 102 is slidably connected to the second fixed frame 101. The third fixed frame 103 is connected to the first fixed frame 91. The third fixed frame 103 is in contact with the second movable member 102. The rotating plate 104 is rotatably connected to the rear side of the third fixed frame 103. The rotating plate 104 is used to push the second movable member 102 to reset. Two pins 105 are slidably connected to the third fixed frame 103 to lock and fix the rotating plate 104.
[0040] It should be noted that as the first fixed frame 91 begins to move backward, it will drive the third fixed frame 103 to move backward synchronously. At this time, the third fixed frame 103 will push the second moving component 102. Since the second fixed frame 101 is connected to the connecting frame 83, as the second moving component 102 moves backward, it will squeeze the second fixed frame 101, thereby causing the connecting frame 83 to move downward, which in turn causes the sampling frames 82 to move downward and contact the conveying component 1, starting the collection and sampling of apatite tailings. When it is not necessary to immediately remove the sample, even if the first fixed frame 91 moves backward... When the first fixed frame 91 moves forward to reset, the third fixed frame 103 will not push the second moving part 102. The sampling frame 82 will still be in the sampling state of adhering to the conveying component 1. When it is necessary to take out the sample, the rotating plate 104 will be flipped forward and the pins 105 will be pushed to the right so that the pins 105 lock the rotating plate 104. At this time, when the first fixed frame 91 moves forward to reset again, the rotating plate 104 will push the second moving part 102 to move forward to reset, so that the second fixed frame 101 drives the connecting frame 83 to move upward, thereby lifting the sampling frame 82 upward to complete the sampling operation.
[0041] like Figure 1 and Figure 10 As shown, it also includes a cover plate mechanism 11, which includes a fixed seat 111 and a flip cover plate 112. The fixed seat 111 is connected to the upper part of the unloading frame 2, and the flip cover plate 112 for covering and closing is rotatably connected to the fixed seat 111.
[0042] It should be noted that, in order to prevent foreign objects from entering the feeding frame 2, the flip cover 112 can be flipped upwards and closed after the apatite tailings are poured in.
[0043] Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.
Claims
1. A microbial leaching device for apatite tailings, characterized in that: The device includes a conveying assembly (1), a feeding frame (2), a liquid storage assembly (3), a first spraying assembly (4), a second spraying assembly (5), and a reciprocating mechanism (6). The feeding frame (2) is connected to the left side of the conveying assembly (1), the liquid storage assembly (3) is connected to the middle of the conveying assembly (1), the first spraying assembly (4) is connected between the liquid storage assembly (3) and the feeding frame (2), and the second spraying assembly (5) is connected between the liquid storage assembly (3) and the conveying assembly (1). The reciprocating mechanism (6) is provided on the conveying assembly (1), and the reciprocating mechanism (6) includes a drive motor (61). The conveying assembly (1) consists of a reciprocating screw (62), a first moving part (63), and a limiting frame (64). A drive motor (61) is connected to the front side of the middle part of the conveying assembly (1). A reciprocating screw (62) is connected to the output shaft of the drive motor (61). A limiting frame (64) is connected to the upper rear part of the conveying assembly (1). The limiting frame (64) is rotatably connected to the reciprocating screw (62). A first moving part (63) is threadedly connected to the reciprocating screw (62). The first moving part (63) is connected to the second spraying assembly (5). The first moving part (63) is slidably connected to the conveying assembly (1). It also includes a disintegration mechanism (7), which includes a limit seat (71), a disintegration frame (72), a first rack (73), a rotating component (74), and a protective frame (75). The front and rear sides of the feeding frame (2) are connected to the limit seat (71), the upper and lower parts of the feeding frame (2) are slidably connected to the disintegration frame (72), the front and rear sides of the disintegration frame (72) are connected to the first rack (73), the limit seat (71) is connected to the rotating component (74), and the front and rear sides of the feeding frame (2) are connected to the protective frame (75). It also includes a sampling mechanism (8), which includes a limiting member (81), a sampling frame (82) and a connecting frame (83). The right inner side of the conveying component (1) is connected to two limiting members (81), and the sampling frame (82) is slidably connected to each limiting member (81). The top of the sampling frame (82) is connected to the connecting frame (83). It also includes an adjustment mechanism (9), which includes a first fixed frame (91), a second rack (92), a gear ring (93), a rotating rod (94), and a mounting base (95). The top of the first moving part (63) is connected to the first fixed frame (91), and the first fixed frame (91) is connected to the second rack (92) on both the front and rear sides. The liquid storage component (3) is rotatably connected to the rotating rod (94) on both the front and rear sides. The rotating rod (94) is connected to the gear ring (93) on both the left and right sides. The gear ring (93) on the left side meshes with the first rack (73), and the gear ring (93) on the right side meshes with the second rack (92). The right side of the feed frame (2) is connected to the mounting base (95) by bolts on both the front and rear sides. The mounting base (95) is rotatably connected to the adjacent rotating rod (94). It also includes a lifting mechanism (10), which includes a second fixed frame (101), a second movable part (102), a third fixed frame (103), a rotating plate (104), and a pin (105). The second fixed frame (101) is connected to the left side of the connecting frame (83). The second movable part (102) is slidably connected to the second fixed frame (101). The third fixed frame (103) is connected to the first fixed frame (91). The third fixed frame (103) is in contact with the second movable part (102). The rotating plate (104) is rotatably connected to the rear side of the third fixed frame (103). The upper and lower pins (105) are slidably connected to the third fixed frame (103).
2. The microbial leaching device for apatite tailings as described in claim 1, characterized in that: It also includes a cover plate mechanism (11), which includes a fixed seat (111) and a flip cover plate (112). The upper part of the feeding frame (2) is connected to the fixed seat (111), and the flip cover plate (112) is rotatably connected to the fixed seat (111).
3. The microbial leaching device for apatite tailings as described in claim 1, characterized in that: The conveying assembly (1) includes a mounting frame, a drive roller, a driven roller and a conveyor belt. The drive roller is rotatably connected to the left side of the mounting frame and the driven roller is rotatably connected to the right side of the mounting frame. The conveyor belt is wound between the drive roller and the driven roller.
4. The microbial leaching device for apatite tailings as described in claim 1, characterized in that: The rotating assembly (74) includes a long rotating shaft, a short rotating shaft, and gears. The long rotating shaft is rotatably connected to the limiting seat (71). Gears are connected to both the upper and lower ends of the long rotating shaft. The gears on the lower side of the long rotating shaft mesh with the first rack (73) on the lower side. The short rotating shaft is rotatably connected to the upper part of the limiting seat (71). Gears are also connected to both the upper and lower sides of the short rotating shaft. The gears on the lower side of the short rotating shaft mesh with the gears on the upper side of the long rotating shaft. The gears on the upper side of the short rotating shaft mesh with the first rack (73) on the upper side.
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