Screw lifting frame for transformer air cooler maintenance

Abstract

This utility model provides a screw-driven lifting frame for the maintenance of transformer air coolers. The maintenance frame is installed on one side of the transformer air cooler. A fixed base is located at the bottom of the maintenance frame, and two sets of top plates are located on the upper part of the frame. The fixed base is connected to the top plates at both ends via multiple first guide rods and a first screw. A lifting frame is also provided, with both ends slidably connected to the multiple first guide rods and threadedly connected to the first screw. A first motor is mounted on the fixed base and connected to the first screw. The first motor drives the entire lifting frame to move up and down on the maintenance frame for the maintenance of the transformer air cooler. The overall structure is reasonable, easy to operate, and highly efficient, suitable for the daily maintenance and high-precision maintenance needs of transformer air coolers under complex operating conditions.

Description

Technical Field

[0001] This utility model relates to the field of transformer maintenance technology, and in particular to a screw lifting frame for the maintenance of transformer air coolers. Background Technology

[0002] The air cooler of a large transformer is approximately 5 meters high, and the cooling fans are typically arranged in three rows of two or three rows of three. Currently, ordinary scaffolding is generally used for maintenance. However, the site surface is mostly cobblestone, and the space is confined. Using ladders for maintenance work presents problems such as poor operability and stability, as well as the risk of slipping and falls from height. Erecting scaffolding not only presents challenges such as high construction difficulty and large workload, but also difficulties such as non-adjustable height and poor operation, and it occupies a large space and complicates the working environment. To safely, efficiently, and conveniently complete the maintenance of the air cooler, a fixed, reliable, height-adjustable, and easy-to-operate lifting scaffolding needs to be designed. Utility Model Content

[0003] The main purpose of this utility model is to provide a screw lifting frame for the maintenance of transformer air coolers, which solves the problems of poor operability and stability, as well as the risk of slipping and falling from heights that are mainly present in the maintenance work using ladders.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a screw lifting frame for the maintenance of transformer air coolers. The maintenance frame is set on one side of the transformer air cooler. The bottom of the maintenance frame is provided with a fixed base. The upper part of the maintenance frame is provided with two sets of top plates. The two ends of the fixed base are connected to the top plates through multiple first guide rods and a first screw. A lifting frame is also provided. The two ends of the lifting frame are slidably connected to multiple first guide rods, and the two ends of the lifting frame are threadedly connected to the first screw. A first motor is provided on the fixed base, and the first motor is connected to the first screw.

[0005] The first motor drives the entire lifting frame to move up and down the maintenance frame to inspect the transformer air cooler.

[0006] In the preferred embodiment, the maintenance frame includes multiple horizontal and vertical bars, which are connected to form at least two rectangular frames. The two rectangular frames are connected by multiple connecting rods to form a rectangular maintenance frame.

[0007] The inner outer ring of the maintenance frame is equipped with multiple connecting lugs, which are threaded to the transformer.

[0008] The lower side of the maintenance frame is also equipped with multiple support feet, which are threadedly connected to the lower end of the maintenance frame.

[0009] In the preferred embodiment, the fixed base is provided with mounting rings at both ends, and the mounting rings are set on the connecting rod at the bottom of the maintenance frame;

[0010] The top plate is mounted on the vertical bars at the top of the maintenance frame at both ends.

[0011] In the preferred embodiment, the first motor is located in the middle of the fixed base, the first motor is connected to the first gearbox, the first gearbox drives the transmission rod, and the two ends of the transmission rod are respectively connected to the first screws at both ends of the fixed base.

[0012] In a preferred embodiment, the first gearbox includes a meshing first bevel gear and a second bevel gear. The first bevel gear is connected to the first motor, and the second bevel gear is mounted on the transmission rod.

[0013] In the preferred embodiment, the end of the transmission rod is connected to the first screw via a second gearbox. The second gearbox includes a meshing third bevel gear and a fourth bevel gear. The third bevel gear is mounted on the first screw, and the fourth bevel gear is mounted on the end of the transmission rod.

[0014] In the preferred embodiment, the diameter of the first bevel gear is larger than the diameter of the second bevel gear;

[0015] The diameter of the third bevel gear is larger than that of the fourth bevel gear.

[0016] In the preferred embodiment, the lifting frame is also equipped with a maintenance platform that moves laterally. The maintenance platform is slidably connected to the lifting frame. A second motor is also provided at one end of the lifting frame. A second screw is provided on the lifting frame. The second screw is threadedly connected to the maintenance platform. The second motor drives the maintenance platform to move laterally on the maintenance platform.

[0017] In the preferred embodiment, the lifting frame is provided with multiple second guide rods, and the lower surface of the inspection platform is provided with a guide slider, which is slidably connected to the second guide rods;

[0018] The underside of the inspection platform is also equipped with a nut block, which is threadedly connected to the second screw.

[0019] In the preferred embodiment, the output end of the second motor is provided with a first gear, and the end of the second screw is provided with a second gear, which meshes with the first gear;

[0020] The diameter of the first gear is smaller than the diameter of the second gear.

[0021] This utility model provides a screw-driven lifting frame for transformer air cooler maintenance. Multiple first guide rods and first screws are slidably and threadedly connected to the lifting frame, and driven by a first motor, enabling stable up-and-down movement of the lifting frame on the maintenance frame, improving the safety and efficiency of maintenance operations. The maintenance frame consists of multiple rectangular frames composed of horizontal and vertical bars, forming an integral structure through connecting rods, enhancing the strength and rigidity of the device. The connecting lug design allows the maintenance frame to be firmly installed on the transformer, and the support feet are height-adjustable to adapt to different installation environments. The fixed base is connected to the lower part of the maintenance frame via mounting rings, and the top plate is set on the upper vertical bar, ensuring the overall structure is stable and reliable. The first motor drives the transmission rod through a first gearbox and is connected to the first screw through a second gearbox. The bevel gear meshing structure achieves efficient power transmission, and the multi-stage reduction and torque-increasing design improves the system's operational smoothness and load-bearing capacity. The lifting frame is equipped with a laterally movable maintenance platform, which is slidably connected to a guide slider through a second guide rod, and driven by the threaded transmission of the second screw and nut block, achieving precise lateral displacement of the maintenance platform. The second motor drives the second screw through the meshing of the first and second gears, further increasing the transmission torque and enhancing operational stability. The overall structure is rationally laid out, easy to operate, and highly efficient in transmission, making it suitable for the daily maintenance and high-precision repair needs of transformer air coolers under complex operating conditions. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is a structural diagram of the maintenance rack installation for this utility model;

[0024] Figure 2 This is the overall structural diagram of the maintenance rack of this utility model;

[0025] Figure 3 This is an installation structure diagram of the fixed base and lifting frame of this utility model;

[0026] Figure 4 This is a diagram of the drive installation structure of the inspection platform of this utility model;

[0027] Figure 5 This is a diagram of the internal installation structure of the second gearbox of this utility model;

[0028] Figure 6 This is a diagram of the internal installation structure of the first gearbox of this utility model.

[0029] In the diagram: Transformer 1; Maintenance rack 2; Connecting lug 201; Horizontal bar 202; Vertical bar 203; Support leg 204; Connecting rod 205; Fixed base 3; Mounting ring 301; Lifting frame 4; Second guide rod 401; Second screw 402; Second motor 403; First gear 404; Second gear 405; Maintenance platform 5; Guide slider 501; Nut block 502; First motor 6; First gearbox 7; First bevel gear 701; Second bevel gear 702; Transmission rod 8; Second gearbox 9; Third bevel gear 901; Fourth bevel gear 902; First screw 10; First guide rod 11; Top plate 12. Detailed Implementation

[0030] like Figure 1-6 As shown, a screw lifting frame for the maintenance of a transformer air cooler is provided. The maintenance frame 2 is set on one side of the air cooler of the transformer 1. The bottom of the maintenance frame 2 is provided with a fixed base 3. The upper part of the maintenance frame 2 is provided with two sets of top plates 12. The two ends of the fixed base 3 are connected to the top plates 12 through multiple first guide rods 11 and a first screw 10. A lifting frame 4 is also provided. The two ends of the lifting frame 4 are slidably connected to multiple first guide rods 11, and the two ends of the lifting frame 4 are threadedly connected to the first screw 10. The fixed base 3 is provided with a first motor 6, which is connected to the first screw 10.

[0031] The first motor 6 drives the entire lifting frame 4 to move up and down on the maintenance frame 2 to inspect the air cooler of transformer 1.

[0032] like Figure 1 As shown, a maintenance rack 2 is set on one side of the air cooler of transformer 1. The maintenance rack 2 is stably installed by a fixed base 3. The two ends of the lifting frame 4 are slidably connected to multiple first guide rods 11 and threadedly connected to the first screw 10. The first motor 6 is started, and the first motor 6 drives the first screw 10 to rotate, thereby driving the lifting frame 4 to move up and down along the first guide rods 11 to realize the maintenance operation of the air cooler of transformer 1.

[0033] The scheme has a simple structure and is easy to operate. The first motor 6 drives the first screw 10, which enables the lifting frame 4 to move up and down smoothly on the maintenance frame 2, improving maintenance efficiency and safety. At the same time, the design of multiple first guide rods 11 enhances the stability of the lifting process, making it suitable for the daily maintenance and repair of the air cooler of transformer 1.

[0034] In the preferred embodiment, the maintenance frame 2 includes multiple horizontal bars 202 and vertical bars 203. The multiple horizontal bars 202 and vertical bars 203 are connected to form at least two rectangular frames. The two rectangular frames are connected by multiple connecting rods 205 to form a rectangular structure maintenance frame 2.

[0035] The inner outer ring of the maintenance frame 2 is provided with multiple connecting ears 201, which are threadedly connected to the transformer 1.

[0036] The lower end of the maintenance frame 2 is also provided with multiple support feet 204, which are threadedly connected to the lower end of the maintenance frame 2.

[0037] like Figure 2 As shown, the maintenance frame 2 is set on one side of the air cooler of transformer 1. The maintenance frame 2 consists of at least two rectangular frames composed of multiple horizontal bars 202 and vertical bars 203. The two rectangular frames are connected by multiple connecting rods 205 to form a stable rectangular structure. Multiple connecting ears 201 set on the inner outer ring of the maintenance frame 2 are threadedly connected to transformer 1 to fix the maintenance frame 2 to transformer 1. According to the needs of the site, multiple support feet 204 set on one side of the lower end of the maintenance frame 2 are adjusted. The support feet 204 are threadedly connected to the lower end of the maintenance frame 2 to adjust the height of the maintenance frame 2 and ensure the stability of the overall structure.

[0038] The rectangular frame composed of horizontal bars 202 and vertical bars 203, along with the connecting rod 205, enhances the overall strength and rigidity of the maintenance rack 2. The maintenance rack 2 is connected to the transformer 1 by connecting ears 201, ensuring a firm and reliable installation. Meanwhile, the support feet 204 are height-adjustable to adapt to different terrains and installation requirements, improving applicability and ease of operation. It is suitable for maintenance work environments around the air cooler of the transformer 1.

[0039] In the preferred embodiment, the fixed base 3 is provided with mounting rings 301 at both ends, and the mounting rings 301 are set on the connecting rod 205 at the lower part of the maintenance frame 2;

[0040] The top plate 12 is mounted on the vertical rods 203 on the upper part of the maintenance frame 2 at both ends.

[0041] Mounting rings 301 at both ends of the fixed base 3 are fitted onto the connecting rods 205 at the bottom of the maintenance frame 2 to achieve a stable connection between the fixed base 3 and the maintenance frame 2. At the same time, the two ends of the top plate 12 are set on the vertical rods 203 at the top of the maintenance frame 2 to ensure that the top plate 12 is firmly installed on the top of the maintenance frame 2. This ensures that the fixed base 3 and the top plate 12 are firmly fixed on the maintenance frame 2 as a whole, providing a support foundation for the sliding and threaded connection of the lifting frame 4.

[0042] This design, through the cooperation of the mounting ring 301 and the connecting rod 205, and the connection design of the top plate 12 and the vertical rod 203, enables the fixed base 3 and the top plate 12 to be quickly and reliably installed on the maintenance rack 2. The structure is simple and easy to install, which enhances the stability and load-bearing capacity of the entire device and is conducive to the smooth operation of the lifting frame 4. It is suitable for the installation and use environment of the transformer 1 air cooler maintenance equipment.

[0043] In the preferred embodiment, the first motor 6 is located in the middle of the fixed base 3. The first motor 6 is connected to the first gearbox 7. The first gearbox 7 drives the transmission rod 8. The two ends of the transmission rod 8 are respectively connected to the first screws 10 at both ends of the fixed base 3.

[0044] The first motor 6 is installed in the middle of the fixed base 3. The first motor 6 is connected to the first gearbox 7. The first motor 6 drives the first gearbox 7 to rotate. The first gearbox 7 drives the transmission rod 8 to rotate. The two ends of the transmission rod 8 are respectively connected to the first screws 10 at both ends of the fixed base 3, thereby synchronously driving the first screws 10 on both sides to rotate, so as to realize the smooth lifting and lowering movement of the lifting frame 4 on the first guide rod 11.

[0045] The first motor 6 and the first gearbox 7 work together to drive the transmission rod 8, so that the first screws 10 on both sides rotate synchronously. This ensures the synchronicity and stability of the lifting frame 4 during the lifting process, reduces the risk of off-center load during equipment operation, and improves the safety and reliability of maintenance operations. It is suitable for the high-precision control requirements of the lifting device during the maintenance of the air cooler of transformer 1.

[0046] In a preferred embodiment, the first gearbox 7 includes a meshing first bevel gear 701 and a second bevel gear 702. The first bevel gear 701 is connected to the first motor 6, and the second bevel gear 702 is mounted on the transmission rod 8.

[0047] The first motor 6 is connected to the first gearbox 7. The first gearbox 7 is equipped with a first bevel gear 701 and a second bevel gear 702 that mesh with each other. The first bevel gear 701 is connected to the output shaft of the first motor 6, and the second bevel gear 702 is mounted on the transmission rod 8. When the first motor 6 is started, the power is transmitted to the second bevel gear 702 through the first bevel gear 701, which in turn drives the transmission rod 8 to rotate, thereby driving the first screws 10 at both ends of the fixed base 3 to rotate synchronously, so as to realize the smooth lifting of the lifting frame 4.

[0048] This solution adopts the meshing structure of the first bevel gear 701 and the second bevel gear 702, which realizes the efficient transmission of power. The structure is compact and the transmission is stable. It can effectively ensure the synchronization and reliability of the transmission rod 8 and improve the coordination of the entire lifting system. It is suitable for the high-precision transmission control requirements of the lifting device in the maintenance equipment of the transformer 1 air cooler.

[0049] In a preferred embodiment, the end of the transmission rod 8 is connected to the first screw 10 via a second gearbox 9. The second gearbox 9 includes a meshing third bevel gear 901 and a fourth bevel gear 902. The third bevel gear 901 is mounted on the first screw 10, and the fourth bevel gear 902 is mounted on the end of the transmission rod 8.

[0050] In the preferred embodiment, the diameter of the first bevel gear 701 is larger than the diameter of the second bevel gear 702;

[0051] The diameter of the third bevel gear 901 is larger than that of the fourth bevel gear 902.

[0052] The end of the transmission rod 8 is connected to the first screw 10 via a second gearbox 9. The second gearbox 9 contains a meshing third bevel gear 901 and a fourth bevel gear 902. The third bevel gear 901 is mounted on the first screw 10, and the fourth bevel gear 902 is located at the end of the transmission rod 8. When the transmission rod 8 rotates, power is transmitted to the third bevel gear 901 via the fourth bevel gear 902, thereby driving the first screw 10 to rotate. Preferably, the diameter of the first bevel gear 701 is larger than that of the second bevel gear 702, and the diameter of the third bevel gear 901 is larger than that of the fourth bevel gear 902, to achieve a speed reduction and torque increase effect, improving the stability and load-bearing capacity of the lifting frame 4.

[0053] This solution achieves efficient power transmission between the transmission rod 8 and the first screw 10 through the structure of the third bevel gear 901 and the fourth bevel gear 902 in the second gearbox 9. Combined with the diameter difference design of the first bevel gear 701 and the second bevel gear 702, as well as the third bevel gear 901 and the fourth bevel gear 902, a multi-stage reduction and torque amplification structure is formed, which improves the output torque and running stability of the transmission system, enhances the load-bearing capacity and control precision of the entire lifting device, and is suitable for the application requirements of high stability and high reliability of the lifting system during the maintenance of the air cooler of transformer 1.

[0054] In the preferred embodiment, the lifting frame 4 is also provided with a horizontally movable maintenance platform 5. The maintenance platform 5 is slidably connected to the lifting frame 4. One end of the lifting frame 4 is also provided with a second motor 403. The lifting frame 4 is provided with a second screw 402. The second screw 402 is threadedly connected to the maintenance platform 5. The second motor 403 drives the maintenance platform 5 to move horizontally on the maintenance platform 5.

[0055] A maintenance platform 5 that moves laterally is set on the lifting frame 4. The maintenance platform 5 is slidably connected to the lifting frame 4. A second motor 403 is provided at one end of the lifting frame 4. A second screw 402 is also provided on the lifting frame 4. The second screw 402 is threadedly connected to the maintenance platform 5. When the second motor 403 is started, the second screw 402 is driven to rotate, thereby driving the maintenance platform 5 to move laterally along the lifting frame 4, so as to realize flexible maintenance operations on different positions of the air cooler of transformer 1.

[0056] This solution expands the operational range of maintenance work by setting up a horizontally movable maintenance platform 5, thereby improving the flexibility and efficiency of maintenance work. By using a second motor 403 to drive the second screw 402, the smooth and precise movement control of the maintenance platform 5 is achieved. The structure is simple and easy to operate, and it is suitable for the refined maintenance needs of complex parts of the air cooler of transformer 1.

[0057] In the preferred embodiment, the lifting frame 4 is provided with multiple second guide rods 401, and the lower surface of the inspection platform 5 is provided with a guide slider 501, which is slidably connected to the second guide rods 401.

[0058] The lower surface of the inspection platform 5 is also provided with a nut block 502, which is threadedly connected to the second screw 402.

[0059] Multiple second guide rods 401 are installed on the lifting frame 4, and a guide slider 501 is provided on the lower surface of the maintenance platform 5. The guide slider 501 is slidably connected to the second guide rods 401 to realize the stable lateral sliding of the maintenance platform 5 on the lifting frame 4. At the same time, a nut block 502 is also provided on the lower surface of the maintenance platform 5. The nut block 502 is threadedly connected to the second screw 402. The second screw 402 is driven to rotate by the second motor 403, which drives the maintenance platform 5 to move precisely along the direction of the second guide rods 401, so as to complete the flexible maintenance of different positions of the air cooler of transformer 1.

[0060] This solution enhances the stability and accuracy of the lateral movement of the maintenance platform 5 through the cooperative structure of the second guide rod 401 and the guide slider 501; at the same time, the threaded connection between the nut block 502 and the second screw 402 realizes reliable transmission and sensitive movement control. The overall structure is compact and the operation is stable, effectively improving the safety and work efficiency of the maintenance of the air cooler of transformer 1.

[0061] In the preferred embodiment, the output end of the second motor 403 is provided with a first gear 404, and the end of the second screw 402 is provided with a second gear 405, which meshes with the first gear 404;

[0062] The diameter of the first gear 404 is smaller than the diameter of the second gear 405.

[0063] The output end of the second motor 403 is equipped with a first gear 404, and the end of the second screw 402 is equipped with a second gear 405. The second gear 405 meshes with the first gear 404 for transmission. When the second motor 403 starts, power is transmitted to the second gear 405 through the first gear 404, thereby driving the second screw 402 to rotate and driving the maintenance platform 5 to move laterally along the second guide rod 401. Since the diameter of the first gear 404 is smaller than the diameter of the second gear 405, a speed reduction and torque increase effect is achieved, improving the stability and load-bearing capacity of the maintenance platform 5.

[0064] This solution achieves power transmission from the second motor 403 to the second screw 402 through the meshing structure of the first gear 404 and the second gear 405. The structure is compact and the transmission is reliable. At the same time, the diameter of the first gear 404 is smaller than that of the second gear 405, forming a reduction ratio, which effectively increases the transmission torque and enhances the stability and load resistance of the maintenance platform 5. It is suitable for high-precision maintenance operations under complex working conditions of the transformer 1 air cooler.

[0065] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A screw lifting frame for the maintenance of transformer air coolers, characterized in that: The maintenance rack (2) is set on one side of the air cooler of the transformer (1). The maintenance rack (2) has a fixed base (3) at the bottom and two sets of top plates (12) on the upper part. The fixed base (3) is connected to the top plate (12) at both ends by multiple first guide rods (11) and a first screw (10). It is also equipped with a lifting frame (4). The lifting frame (4) is slidably connected to multiple first guide rods (11) at both ends and threadedly connected to the first screw (10) at both ends. The fixed base (3) is equipped with a first motor (6) and the first motor (6) is connected to the first screw (10). The first motor (6) drives the entire lifting frame (4) to move up and down on the maintenance frame (2) to maintain the transformer (1) air cooler.

2. The screw rod lifting rack for transformer air cooler overhauling according to claim 1, characterized in that: The maintenance frame (2) includes multiple horizontal bars (202) and vertical bars (203). The multiple horizontal bars (202) and vertical bars (203) are connected to form at least two rectangular frames. The two rectangular frames are connected by multiple connecting rods (205) to form a rectangular maintenance frame (2). The maintenance rack (2) has multiple connecting ears (201) on its inner outer ring, and the connecting ears (201) are threadedly connected to the transformer (1); The lower side of the maintenance rack (2) is also provided with multiple support feet (204), which are threadedly connected to the lower end of the maintenance rack (2).

3. The screw rod lifting rack for transformer air cooler overhauling according to claim 2, characterized in that: The fixed base (3) is provided with mounting rings (301) at both ends, and the mounting rings (301) are set on the connecting rod (205) at the bottom of the maintenance frame (2); The top plate (12) is set on the vertical bar (203) on the upper part of the maintenance frame (2) at both ends.

4. The screw rod lifting rack for transformer air cooler overhauling according to claim 1, characterized in that: The first motor (6) is located in the middle of the fixed base (3). The first motor (6) is connected to the first gearbox (7). The first gearbox (7) drives the transmission rod (8). The two ends of the transmission rod (8) are respectively connected to the first screws (10) at both ends of the fixed base (3).

5. The screw rod lifting rack for transformer air cooler overhauling according to claim 4, characterized in that: The first gearbox (7) includes a meshing first bevel gear (701) and a second bevel gear (702). The first bevel gear (701) is connected to the first motor (6), and the second bevel gear (702) is mounted on the transmission rod (8).

6. The screw rod lifting rack for transformer air cooler overhauling according to claim 5, characterized in that: The end of the transmission rod (8) is connected to the first screw (10) through the second gearbox (9). The second gearbox (9) includes a meshing third bevel gear (901) and a fourth bevel gear (902). The third bevel gear (901) is mounted on the first screw (10), and the fourth bevel gear (902) is mounted on the end of the transmission rod (8).

7. The screw rod lifting rack for transformer air cooler overhauling according to claim 6, characterized in that: The diameter of the first bevel gear (701) is larger than the diameter of the second bevel gear (702); The diameter of the third bevel gear (901) is larger than that of the fourth bevel gear (902).

8. The screw rod lifting rack for transformer air cooler overhauling according to claim 1, characterized in that: The lifting frame (4) is also equipped with a horizontally movable maintenance platform (5). The maintenance platform (5) is slidably connected to the lifting frame (4). A second motor (403) is also provided at one end of the lifting frame (4). A second screw (402) is provided on the lifting frame (4). The second screw (402) is threadedly connected to the maintenance platform (5). The second motor (403) drives the maintenance platform (5) to move horizontally on the maintenance platform (5).

9. The screw rod lifting rack for transformer air cooler overhauling according to claim 8, characterized in that: The lifting frame (4) is provided with multiple second guide rods (401), and the lower surface of the inspection platform (5) is provided with a guide slider (501). The guide slider (501) is slidably connected to the second guide rods (401). The lower surface of the inspection platform (5) is also provided with a nut block (502), which is threadedly connected to the second screw (402).

10. The screw rod lifting rack for transformer air cooler overhauling according to claim 8, characterized in that: The output end of the second motor (403) is provided with a first gear (404), and the end of the second screw (402) is provided with a second gear (405), which meshes with the first gear (404); The diameter of the first gear (404) is smaller than the diameter of the second gear (405).

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