A high-precision positioning fixture for a heavy-duty double-end face grinder

Abstract

This invention provides a high-precision positioning fixture for a heavy-duty double-end face grinder, belonging to the field of grinder fixture technology. This high-precision positioning fixture for a heavy-duty double-end face grinder includes a fixture unit composed of multiple fixture components. Each fixture component includes: a gear ring, which meshes with the grinder's internal gear ring and drive gear, and is capable of driving the gear ring to revolve and rotate; and a body, which rotates inside the gear ring and is capable of rotating relative to the gear ring. The body has a fixing groove for placing the workpiece, which extends through the upper and lower sides of the body. Through the meshing transmission structure of the gear ring, gear, and upper and lower gear rings, the gear's rotational motion during its revolution superimposed on its rotational motion transmits power to the lower gear ring, driving the body to rotate at increased speed. This breaks through the limitations of traditional gear meshing ratios, significantly increases the workpiece's rotational speed, improves the relative grinding efficiency with the grinding table, shortens the processing cycle of high-hardness, high-precision workpieces, and meets the needs of mass production.

Description

Technical Field

[0001] This invention belongs to the field of grinding machine fixture technology, specifically relating to a high-precision positioning fixture for a heavy-duty double-end face grinder. Background Technology

[0002] A double-end face grinder is a high-efficiency surface machining tool that can grind two parallel end faces simultaneously in a single process. This type of machine tool is widely used in the machining of workpieces requiring high precision and parallelism. Based on its structure, it can be divided into horizontal and vertical types, and based on its feeding method, it can be divided into through-feed, rotary, and reciprocating types.

[0003] Chinese patent CN211681271U discloses a double-end face grinder, including an annular feeding channel, an internal gear ring, a drive gear, a fixture, a lower grinding table, an upper grinding table, an upper grinding table transfer device, and a lifting mechanism. The internal gear ring is fixedly disposed on the outer edge of the annular feeding channel. The drive gear is disposed within the inner ring of the annular feeding channel. By configuring the annular feeding channel, the internal gear ring, the drive gear, and the fixture, the workpiece to be processed is made to perform planetary motion around the axis of the grinding table along with the fixture, increasing the relative speed of the workpiece and the grinding table, and realizing automatic loading and unloading, which to some extent solves the problems of difficult automation and low processing efficiency of traditional grinding machines.

[0004] However, the existing double-end face grinders still have room for improvement in practical applications: the rotation of their fixtures relies on the meshing transmission between the drive gear and the internal gear ring. Limited by the design characteristics of this transmission structure (such as the gear meshing ratio), the rotation speed of the fixture is difficult to further increase. The fixture rotation speed directly affects the relative grinding speed between the workpiece and the grinding table. When dealing with high-hardness processing materials, workpieces with high-precision surface requirements, or scenarios requiring high-efficiency batch production, the existing slow fixture rotation speed leads to insufficient grinding efficiency. This not only prolongs the processing cycle of a single workpiece but may also affect the flatness and processing accuracy of the workpiece end face due to insufficient grinding, failing to meet the demands of modern manufacturing for efficient and high-precision machining. Summary of the Invention

[0005] The purpose of this invention is to provide a high-precision positioning fixture for a heavy-duty double-end face grinder, which aims to solve the problem that the self-rotation of the fixture is difficult to improve in the prior art, thus affecting work efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-precision positioning fixture for a heavy-duty double-end face grinder, comprising: a fixture unit assembled from multiple fixture components, wherein each fixture component includes: a gear ring, which meshes with the internal gear ring and the drive gear of the grinder and is capable of driving the gear ring to revolve and rotate; a body, which rotates inside the gear ring and is capable of rotating relative to the gear ring, and is provided with a fixing groove for placing a workpiece, the fixing groove extending through the upper and lower sides of the body; an upper gear ring, which is installed on the upper side of the body and is capable of rotating relative to the body; a lower gear ring, which is installed on the lower side of the body and is capable of driving the body to rotate; and a gear, which is rotatably disposed inside the gear ring, and the upper and lower sides of the gear ring mesh with the upper and lower gear rings respectively.

[0007] Its effect is as follows: through the meshing transmission structure of the gear ring, gear and upper and lower gear rings, the gear superimposed on the rotation motion during the revolution, transmits the power to the lower gear ring and drives the body to rotate at a higher speed, breaks through the traditional gear meshing ratio limitation, greatly improves the workpiece rotation speed, improves the relative grinding efficiency with the grinding table, shortens the processing cycle of high hardness and high precision workpieces, and meets the needs of mass production.

[0008] A further technical solution of the present invention is that the main body is provided with a clamping structure, the clamping structure includes a sliding groove formed on the main body, the sliding grooves are in pairs and parallel to each other, and are mirror images of each other on both sides of the fixed groove. The side wall of the main body is provided with an annular groove, and a plurality of arc-shaped clamping plates corresponding one-to-one with the fixed groove are provided in the annular groove. The two ends of the clamping plates are provided with sliders that are slidably connected in the sliding groove. The lower toothed ring is provided with a limiting block that abuts against the outer arc of the clamping plate. The side of the limiting block that abuts against the outer arc of the clamping plate is an arc-shaped surface, and the end away from the clamping plate forms a protrusion. The protrusion can push the clamping plate to slide towards the fixed groove.

[0009] Its effect is as follows: by utilizing the rotation of the lower toothed ring, the protrusion pushes the clamping plate to automatically move closer to the workpiece, and with the help of the fan-shaped fixing groove, it can achieve multi-directional close clamping without the need for an additional drive mechanism. At the same time, it can adapt to workpieces of different sizes. The clamping plate is located in the middle of the body, and the clamping force is more uniform for thicker workpieces, avoiding workpiece movement and edge chipping during grinding, while ensuring the levelness and parallelism of the workpiece end face grinding.

[0010] A further technical solution of the present invention is that the lower surface of the upper toothed ring is provided with a first cross-section tooth that meshes with the gear, and docking arms are provided on both sides, and adjacent clamping assemblies are spliced ​​together through the docking arms.

[0011] A further technical solution of the present invention is that a pressure groove is provided above the upper toothed ring, the pressure groove is lower than the upper surface of the upper toothed ring and coaxial with the upper toothed ring, and a flange is provided on the upper edge of the body, the lower surface of the flange is in contact with the bottom of the pressure groove and can rotate within the pressure groove.

[0012] Its effect is that the upper and lower toothed rings, through the limiting cooperation of the flange and the pressure groove, and the limiting block and the annular groove, avoid deviation or separation during the transmission process, and extend the overall service life of the fixture.

[0013] A further technical solution of the present invention is that the upper side of the lower tooth ring is provided with a second cross-section tooth that meshes with the gear. The gear is located between the first cross-section tooth and the second cross-section tooth and meshes with them simultaneously. A limiting block is provided on one side of the lower tooth ring. Multiple limiting blocks are provided and distributed in a circular array with the axis of the lower tooth ring as the center. The protruding part of the limiting block is located in the annular groove and can slide.

[0014] Its effect is that the gear is positioned by the inner ring of the gear ring and meshes evenly with the upper and lower gear rings at multiple points, distributing the transmission force and reducing the wear and loss of individual gears.

[0015] A further technical solution of the present invention is that the fixing groove is fan-shaped, with the intersection of the two sides facing the axis of the body, and the radius of the clamping plate is smaller than the inner circle radius of the body, and it is located in the middle of the body.

[0016] Its effect is that the fan-shaped fixing groove and the arc-shaped clamping plate work together to achieve multi-directional contact and clamping of the workpiece, ensuring clamping stability, and is especially suitable for the precise positioning of workpieces with irregular cross sections.

[0017] A further technical solution of the present invention is that when the slider slides to the limit position of the groove, the protrusion still remains in abutting state with the clamping plate.

[0018] A further technical solution of the present invention is that the number of gears is not less than three, and they are distributed in a uniform ring array.

[0019] Its effect is that the even distribution of multiple gears enhances the smoothness of transmission and improves the overall rigidity and transmission efficiency of the system.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. Through the meshing transmission structure of the gear ring, gear and upper and lower gear rings, the gear superimposed on the rotation motion during the revolution, transmits power to the lower gear ring and drives the body to rotate at a higher speed. This breaks through the traditional gear meshing ratio limitation, greatly improves the workpiece rotation speed, enhances the relative grinding efficiency with the grinding table, shortens the processing cycle of high hardness and high precision workpieces, and meets the needs of mass production.

[0022] 2. By utilizing the rotation of the lower toothed ring, the protrusion pushes the clamping plate to automatically move closer to the workpiece. Combined with the fan-shaped fixing groove, it achieves multi-directional close clamping without the need for an additional drive mechanism. It is also suitable for workpieces of different sizes. The clamping plate is located in the middle of the body, which provides more uniform clamping force for thicker workpieces, preventing workpiece movement and edge chipping during grinding. At the same time, it ensures the horizontality and parallelism of the workpiece end face grinding.

[0023] 3. The gears are positioned by the inner ring of the gear ring and mesh evenly with the upper and lower gear rings at multiple points, distributing the transmission force and reducing the wear and loss of individual gears; at the same time, the upper and lower gear rings are matched by the flange and the pressure groove, and the limit block and the annular groove, to prevent deviation or disengagement during transmission and extend the overall service life of the fixture.

[0024] 4. The clamping action and the body acceleration are triggered synchronously, without the need for additional control logic. When the lower gear ring rotates, the workpiece is clamped first and then the body is accelerated for grinding. This avoids workpiece displacement caused by accelerating first and then clamping, achieving seamless coordination of clamping, acceleration and grinding, and reducing operation complexity and control costs. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a schematic diagram of the splicing structure in a specific embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of a specific embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the exploded structure of a specific embodiment of the present invention;

[0029] Figure 4 This is an isometric sectional view of a specific embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the meshing structure of the gear and the lower gear ring in a specific embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the installation structure of the clamping plate in a specific embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the cooperation structure between the limiting block and the body in a specific embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the gear's mating structure with the upper and lower gear rings in a specific embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram of the annular groove in a specific embodiment of the present invention.

[0035] In the diagram: 1. Fixture assembly; 2. Body; 3. Upper gear ring; 4. Lower gear ring; 5. Gear ring; 6. Gear; 7. Clamping structure; 21. Fixing groove; 22. Flange; 23. Annular groove; 31. First section tooth; 32. Connecting arm; 33. Slot; 34. Block; 35. Pressing groove; 41. Second section tooth; 42. Limiting block; 71. Slide groove; 72. Slider; 73. Arc surface; 74. Protrusion; 75. Clamping plate. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 1-9 The present invention provides the following technical solution: a high-precision positioning fixture for a heavy-duty double-end face grinder, comprising a fixture unit and a fixture assembly 1. The fixture unit is composed of multiple fixture assemblies 1 spliced ​​together. The fixture assembly 1 includes a body 2, an upper gear ring 3, a lower gear ring 4, a gear ring 5, and a gear 6.

[0038] The gear ring 5 meshes with the internal gear ring and the drive gear of the grinding machine. The gear 6 is installed inside the gear ring 5, and the upper and lower sides of the gear ring 5 mesh with the upper gear ring 3 and the lower gear ring 4. The upper gear ring 3 and the lower gear ring 4 are both installed on the body 2. The upper gear ring 3 can rotate relative to the body 2, and the lower gear ring 4 can drive the body 2 to rotate. The workpiece is installed on the body 2, so that the body 2 can drive the workpiece to rotate.

[0039] Please see Figures 2-4 The main body 2 is disc-shaped and coaxially arranged with the gear ring 5. It can rotate relative to the gear ring 5 and has multiple fixing grooves 21 inside. The fixing grooves 21 penetrate through the upper and lower layers of the main body 2. The multiple fixing grooves 21 are evenly distributed in a ring. The workpiece is placed inside the fixing grooves 21. When the main body 2 rotates, it can drive the workpiece to rotate.

[0040] Please see Figure 3 The upper toothed ring 3 is located above the body 2. The upper toothed ring 3 is circular and has a first cross-section tooth 31 that meshes with the gear 6 on its lower surface. The upper toothed ring 3 has a docking arm 32 on both sides. The docking arm 32 is arc-shaped. Multiple clamping components 1 are spliced ​​into a circular shape through the docking arm 32. The length of the docking arm 32 can be designed and manufactured according to the number of clamping components 1 required. Normally, in the same grinding equipment, the shorter the docking arm 32, the more clamping components 1 can be set in the grinding equipment.

[0041] A snap-fit ​​component is provided on both sides of the two docking arms 32 that are far apart from each other. The snap-fit ​​component consists of a slot 33 and a block 34. The slot 33 and the block 34 are located on the two sides of the two docking arms 32 that are far apart from each other, and the slot 33 and the block 34 can cooperate with each other so that two adjacent upper toothed rings 3 can be docked through the slot 33 and the block 34, thereby realizing the quick docking of the clamp assembly 1. In order to achieve the stability of the docking of the slot 33 and the block 34, the thickness of the block 34 can be appropriately increased to prevent the block 34 from detaching from the slot 33. The connection of the clamp assembly 1 is not limited to the docking of the slot 33 and the block 34. It can also be fixed by screws. In this embodiment, only the slot 33 and the block 34 are used as an example for explanation.

[0042] Please see Figure 3 and Figure 4 A pressure groove 35 is provided above the upper toothed ring 3. The pressure groove 35 is lower than the upper surface of the upper toothed ring 3. The pressure groove 35 is annular and coaxial with the upper toothed ring 3. An annular flange 22 is provided at the upper edge of the body 2. The outer diameter of the flange 22 is equal to the diameter of the pressure groove 35. The lower surface of the flange 22 fits against the bottom of the pressure groove 35, allowing the flange 22 to rotate inside the pressure groove 35. This can limit the upper toothed ring 3 on the body 2 and prevent the upper toothed ring 3 from detaching from the body 2.

[0043] Please see Figure 3 , Figure 7 , Figure 8 and Figure 9 The lower toothed ring 4 is located below the body 2. The upper side of the lower toothed ring 4 is provided with a second cross-section tooth 41 that meshes with the gear 6. The gear 6 is located between the first cross-section tooth 31 and the second cross-section tooth 41 and meshes with each other. A limiting block 42 is provided on one side of the lower toothed ring 4 with the second cross-section tooth 41. The limiting block 42 is connected to the lower toothed ring 4 by screws or integrally formed. The limiting block 42 has multiple rings arranged in a circular array with the axis of the lower toothed ring 4 as the center. The limiting block 42 protrudes from the inner ring of the lower toothed ring 4. The side wall of the body 2 is provided with an annular groove 23. The protruding part of the limiting block 42 is located inside the annular groove 23 and can slide inside the annular groove 23, thereby limiting the lower toothed ring 4 on the body 2 and preventing the lower toothed ring 4 from disengaging from the body 2. The body 2 is also provided with a clamping structure 7. When the limiting block 42 rotates, the clamping structure 7 can drive the body 2 to rotate.

[0044] There are no fewer than three gears 6, which are evenly distributed in a circular array. Gears 6 can mesh with the upper gear ring 3 and the lower gear ring 4 at the same time. Gears 6 are rotatably located on the inner ring of the gear ring 5, which plays a positioning role for gears 6 and prevents gears 6 from being displaced when rotating.

[0045] During operation, the gear ring 5 is driven by the internal gear ring and the drive gear of the grinding machine to revolve and rotate. When the drive gear rotates clockwise, the gear ring 5 rotates counterclockwise, causing the gear 6 inside it to revolve counterclockwise around the center of the upper gear ring 3. Since the upper gear ring 3 is fixed by multiple mating arms 32, it does not rotate. During its revolution, the gear 6 is subjected to the meshing reaction force of the first section teeth 31, and synchronously generates a rotational motion, and the direction of this rotation is the same as the direction of revolution (both are counterclockwise). At this time, the rotation of the gear 6 is the superposition of the revolution speed and the rotation speed, forming a speed-up rotation compared to the basic speed of the gear ring 5. The second section tooth 41 meshes with the lower tooth ring 4, transmitting the superimposed speed-increasing rotational power to the lower tooth ring 4. This causes the lower tooth ring 4 to rotate counterclockwise in the same direction and at the same speed as the gear 6. The limiting block 42 on the lower tooth ring 4 is set in the annular groove 23 of the body 2, so that the limiting block 42 is connected by the clamping structure 7. The speed-increasing rotation of the lower tooth ring 4 is transmitted synchronously to the body 2 through the limiting block 42 and the clamping structure 7, ultimately causing the body 2 to rotate counterclockwise at the same speed as the lower tooth ring 4, thus realizing the speed-increasing rotation of the body 2. The workpiece is mounted on the body 2, thereby further improving the grinding efficiency of the workpiece end face.

[0046] Please see Figures 6-9The clamping structure 7 includes sliding grooves 71 formed on the body 2. The sliding grooves 71 are arranged in pairs, with the pairs parallel to each other. The two sliding grooves 71 are mirror images of each other on both sides of the fixed groove 21, and the axis of the body 2 lies on this mirror plane. Multiple sets of sliding grooves 71 are provided on the body 2, each set arranged in a uniform annular array. A clamping plate 75 is provided inside the annular groove 23, allowing it to slide within the groove. Multiple clamping plates 75 are arranged in a uniform annular array, each corresponding to a fixed groove 21. Slider blocks 72 are provided at both ends of the clamping plates 75. The sliders 72 slide within the sliding grooves 71 and slide along the length of the grooves 71, allowing the clamping plates 75 to slide towards the fixed groove 21. The clamping plates 75 are arc-shaped, with a radius smaller than the radius of the inner ring of the body 2, creating a gap between the clamping plates 75 inside the annular groove 23 and the edge of the body 2. The limiting block 42 has an arc-shaped surface 73. Furthermore, the arc-shaped surface 73 abuts against the outer arc of the clamping plate 75. The end of the limiting block 42 away from the clamping plate 75 is closer to the axis of the body 2 than the other end, causing the end of the limiting block 42 away from the clamping plate 75 to form a protrusion 74. When the protrusion 74 moves to the clamping plate 75, it can push the clamping plate 75 and the slider 72 to slide along the slide groove 71. Even when the slider 72 slides to the limit position of the slide groove 71, the protrusion 74 can still abut against the clamping plate 75 and will not fall out. The clamping plate 75 passes over the fixed groove 21, which is fan-shaped. The intersection of the two sides faces the axis of the body 2. The workpiece is placed inside the fixed groove 21. The limiting block 42 pushes the clamping plate 75 to move, so that the clamping plate 75 is close to the workpiece and abuts against one side of the workpiece. When the workpiece is pushed to move, the workpiece abuts against the two sides of the fixed groove 21. The clamping plate 75 abuts against the two sides of the fixed groove 21 at the same time, so that the workpiece can be clamped and the workpiece can be prevented from moving or chipping during the grinding process.

[0047] In addition, this fixture is designed for grinding thicker workpieces, thus increasing the thickness of the fixture. The clamping plate 75 is located in the middle of the body 2, so that when the workpiece is clamped, it is closer to the middle of the workpiece, making the clamping force on the workpiece more uniform, thereby ensuring the levelness of the workpiece grinding.

[0048] In use, the workpiece is placed inside the fixed groove 21. The lower toothed ring 4 drives the limiting block 42 to rotate at an accelerated speed. Due to the weight of the workpiece itself, the lower toothed ring 4 does not drive the body 2 to rotate when it rotates, so that the lower toothed ring 4 and the body 2 rotate relative to each other. This causes the protrusion 74 on the limiting block 42 to push the clamping plate 75 to move, so that the clamping plate 75 abuts against the workpiece and pushes the workpiece against the two sides of the fixed groove 21, thereby clamping the workpiece. At this time, when the lower toothed ring 4 rotates, the movement of the clamping plate 75 is limited by the workpiece, and the movement of the limiting block 42 is limited by the clamping plate 75. Thus, when the lower toothed ring 4 drives the limiting block 42 to rotate, it can also drive the body 2 to rotate, thereby achieving the purpose of automatically clamping the workpiece. After grinding is completed, the workpiece is disassembled, and the clamping plate 75 can be reset by rotating the lower toothed ring 4 in the opposite direction.

Claims

1. A high-precision positioning fixture for a heavy-duty double-end face grinder, comprising: A clamping unit composed of multiple clamping components (1), characterized in that the clamping components (1) include: The gear ring (5) meshes with the internal gear ring and the drive gear of the grinding machine and can drive the gear ring (5) to revolve and rotate. The main body (2) rotates inside the gear ring (5) and can rotate relative to the gear ring (5). The main body (2) is provided with a fixing groove (21) for placing the workpiece. The fixing groove (21) passes through the upper and lower sides of the main body (2). The upper toothed ring (3) is installed on the upper side of the body (2), and the upper toothed ring (3) can rotate relative to the body (2); The lower toothed ring (4) is installed on the lower side of the body (2), and the lower toothed ring (4) can drive the body (2) to rotate; The gear (6) is rotatably mounted inside the gear ring (5), and the upper and lower sides of the gear ring (5) mesh with the upper gear ring (3) and the lower gear ring (4) respectively. The main body (2) is provided with a clamping structure (7). The clamping structure (7) includes a sliding groove (71) opened on the main body (2). The sliding grooves (71) are arranged in pairs and parallel to each other, and are mirror images of the fixed groove (21) on both sides. The side wall of the main body (2) is provided with an annular groove (23). The annular groove (23) is provided with multiple arc-shaped clamps (75) corresponding to the fixed groove (21). The two ends of the clamps (75) are provided with sliders (72) that are slidably connected in the sliding grooves (71). The lower toothed ring (4) is provided with a limiting block (42) that abuts against the outer arc of the clamp (75). The side of the limiting block (42) that abuts against the outer arc of the clamp (75) is an arc-shaped surface (73). The end away from the clamp (75) forms a protrusion (74). The protrusion (74) can push the clamp (75) to slide towards the fixed groove (21).

2. The high-precision positioning fixture for a heavy-duty double-end face grinder according to claim 1, characterized in that: The upper toothed ring (3) has a first cross-section tooth (31) on its lower surface that meshes with the gear (6), and docking arms (32) are provided on both sides. Adjacent clamping assemblies (1) are spliced ​​together through the docking arms (32).

3. The high-precision positioning fixture for a heavy-duty double-end face grinder according to claim 1, characterized in that: The upper toothed ring (3) is provided with a pressure groove (35) above it. The pressure groove (35) is lower than the upper surface of the upper toothed ring (3) and coaxial with the upper toothed ring (3). The upper edge of the body (2) is provided with a flange (22). The lower surface of the flange (22) is in contact with the bottom of the pressure groove (35) and rotates in the pressure groove (35).

4. The high-precision positioning fixture for a heavy-duty double-end face grinder according to claim 1, characterized in that: The upper side of the lower toothed ring (4) is provided with a second cross-section tooth (41) that meshes with the gear (6). The gear (6) is located between the first cross-section tooth (31) and the second cross-section tooth (41) and meshes with them simultaneously. A limiting block (42) is provided on one side of the lower toothed ring (4). Multiple limiting blocks (42) are provided and distributed in a circular array with the axis of the lower toothed ring (4) as the center. The protruding part of the limiting block (42) is located in the annular groove (23) and can slide.

5. A high-precision positioning fixture for a heavy-duty double-end face grinder according to claim 1, characterized in that: The fixing groove (21) is fan-shaped, with the intersection of the two sides facing the axis of the body (2). The radius of the clamp (75) is smaller than the inner radius of the body (2), and it is located in the middle of the body (2).

6. A high-precision positioning fixture for a heavy-duty double-end face grinder according to claim 1, characterized in that: When the slider (72) slides to the limit position of the groove (71), the protrusion (74) still remains in contact with the clamp (75).

7. A high-precision positioning fixture for a heavy-duty double-end face grinder according to claim 1, characterized in that: The number of gears (6) is no less than three, and they are arranged in a uniform ring array.

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