Pipeline clamping mechanism for detecting air tightness of hydrogen energy pipeline

Abstract

The utility model discloses a pipeline clamping mechanism for hydrogen energy pipeline air tightness detection, which comprises a feeding mechanism and a detection mechanism, the feeding mechanism comprises a supporting seat, the top end of the supporting seat is rotatably provided with a first rotating shaft through a first support, the first rotating shaft is fixedly provided with a feeding turntable, the feeding turntable is provided with a plurality of pipeline fixing clamps, and the pipeline fixing clamps are fixed on the supporting seat. The detection mechanism comprises a detection plug. According to the pipeline fixing clamp, through cooperation of the first hemispherical limiting piece and the second hemispherical limiting piece, the two clamping plates located at the highest point are far away from each other, an undetected pipeline can be placed at the top end of the lower supporting plate, and therefore feeding is completed, after the pipeline fixing clamp is moved away, the two clamping plates get close to each other to be reset under the elastic force of the reset spring, and the pipeline fixing clamp is convenient to use. And when the two clamping plates located at the lowest position are opened, the detected pipeline can be automatically put down, so that the purpose of automatic discharging is achieved, the automation degree of the device is higher, and the detection efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen energy pipeline production, in particular to a pipeline clamping mechanism for hydrogen energy pipeline air tightness detection. Background Art

[0002] With the progress of society, energy consumption is gradually increasing. Due to the non-renewable problem of traditional energy, the research on new energy has become a hot topic in today's society. Among them, hydrogen energy has the advantages of being pollution-free and renewable, and has gradually become one of the key research directions. At present, there are many hydrogen energy industries, such as new energy vehicles, electricity and other industries. The use of hydrogen energy can be seen in hydrogen energy. When hydrogen energy is used, it needs hydrogen pipelines for transmission.

[0003] The hydrogen pipeline (also called pipeline or pipeline) is composed of a pipe body and its accessories. It is equipped with corresponding units according to the needs of the process flow and designed and installed into a complete pipeline system to complete the hydrogen transmission task.

[0004] The pipes of hydrogen energy pipelines are generally steel pipes. During the production process, hydrogen energy pipelines need to be cut in sections and polished and other processing procedures. During the processing, the pipelines may be damaged, causing the pipelines to rupture, thereby damaging the air tightness of the pipelines. If such defective products are used in pipeline systems, they will cause great safety hazards. Therefore, it is necessary to conduct air tightness testing on the pipelines, eliminate products that do not meet the air tightness standards, and improve the overall quality of the products.

[0005] When testing the air tightness of pipelines, the prior art mainly involves manually fixing the pipelines to be tested on a fixture at a testing station. This fixing method is inefficient, and after the test is completed, the pipeline cannot be automatically put down. Utility Model Content

[0006] In order to solve the problems mentioned in the above background technology, the utility model provides a pipeline clamping mechanism for hydrogen energy pipeline air tightness detection.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A pipe clamping mechanism for hydrogen energy pipeline air tightness detection comprises a feeding mechanism and a detection mechanism, wherein the feeding mechanism comprises a support seat, a first rotating shaft is rotatably mounted on the top of the support seat through a first bracket, a feeding turntable is fixed on the first rotating shaft, a plurality of pipe fixing clamps are mounted on the feeding turntable, and the detection mechanism comprises a detection plug, the detection plug is connected to a high-pressure gas tank through a pressure-resistant hose, a pressure sensor is arranged in the detection plug, and the detection plug is driven by a first cylinder to move horizontally to be combined with and separated from the pipeline.

[0009] Preferably, a sorting plate is rotatably mounted on the bottom end of the support seat through a second bracket, and a first conveyor belt and a second conveyor belt are respectively provided on both sides below the sorting plate.

[0010] Preferably, the conveying directions of the first conveyor belt and the second conveyor belt are opposite, and the first conveyor belt and the second conveyor belt both convey in a direction away from each other.

[0011] Preferably, a complete gear is fixed on the mounting shaft of the sorting plate, and a horizontally arranged rack is slidably mounted on the bottom end of the support seat through a slide rail, and the rack is meshed with the complete gear.

[0012] Preferably, a second cylinder is fixed to the bottom end of the support seat, an output end of the second cylinder is fixed to the rack, the first cylinder is fixed to the top end of the third bracket, and the bottom end of the third bracket is fixed to the outer shell of the second conveyor belt.

[0013] Preferably, a driving gear ring is fixed on the side of the feeding turntable away from the pipe fixing clamp, a rotating motor is fixed on the top of the support seat, the rotating motor is equipped with a motor reducer, an incomplete gear is fixed on the output end of the motor reducer, and the incomplete gear is meshed with the driving gear ring.

[0014] Preferably, the pipe fixing clamp includes a lower support plate and a transmission box, the transmission box is fixed to one end of the lower support plate and the bottom end of the lower support plate is fixed to the feeding turntable, a guide support ring is fixed between the multiple lower support plates, a trigger guide rod and a reset guide rod are movably installed on the guide support ring, and a reset spring is installed on the outside of the reset guide rod.

[0015] Preferably, one end of the trigger guide rod away from the transmission box is fixed to the reset guide rod, and the other end of the trigger guide rod movably extends to the interior of the transmission box and is fixed with a transmission rod. Two symmetrically arranged guide grooves are provided on the outside of the transmission rod, and the guide grooves extend spirally. Two L-shaped transmission rods are also provided in the transmission box, one end of the L-shaped transmission rod extends into the guide groove, and the other end of the L-shaped transmission rod is fixed to the annular bracket.

[0016] Preferably, the annular bracket is rotatably installed in the transmission box through an annular guide rail, and the annular guide rail is coaxial with the transmission rod, and a connecting rod is fixed on the side of the two L-shaped transmission rods away from each other, and one end of the connecting rod away from the L-shaped transmission rod extends to the outside of the transmission box through the notch on the transmission box and is fixed with a connecting piece, and a clamping plate is fixed on the side of the two connecting pieces close to each other.

[0017] Preferably, the first rotating shaft is a hollow pipe structure, and a fixed cross bar is fixed to the top of the support seat through the fourth bracket, the fixed cross bar passes through the first rotating shaft, and the cross bar and the first rotating shaft can rotate relative to each other, two vertical rods are fixed to the end of the fixed cross bar away from the fourth bracket, a first hemispherical limit piece is fixed to the end of the vertical rod away from the fixed cross bar, and a second hemispherical limit piece is fixed to the end of the reset guide rod close to the first hemispherical limit piece.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The pipeline to be tested is fixed on the feeding turntable through the pipeline fixing clamp. The feeding turntable rotates to transport each pipeline to the detection plug position in turn. The detection plug is driven by the first cylinder to be inserted into the pipeline to be tested. The detection plug and the feeding turntable are both provided with airtight rubber pads. The two ends of the pipeline are blocked by squeezing, and high-pressure gas is rushed into the inside of the pipeline to maintain the seal. The pressure change is detected by the pressure sensor. If the pressure does not drop rapidly, it means that the pipeline is qualified for air tightness. The purpose of fast feeding is achieved through the feeding turntable, and the detection efficiency is improved;

[0020] The output angular velocity of the output shaft of the motor reducer is reduced by the motor reducer, thereby driving the incomplete gear to rotate at a low speed. Each rotation of the incomplete gear will drive the driving gear ring to rotate a small angle, thereby driving the feeding turntable to rotate a small angle. This angle is exactly the angle between the adjacent pipe fixing clamp positions and the center point of the feeding turntable, thereby achieving the purpose of intermittent feeding;

[0021] Through the cooperation of the first hemispherical stopper and the second hemispherical stopper, the two clamping plates at the highest point are moved away from each other, and the uninspected pipe can be placed on the top of the lower support plate to complete the loading. When the pipe fixing clamp is removed, the two clamping plates will be reset close to each other by the elastic force of the reset spring, thereby automatically clamping the pipe. When the two clamping plates at the lowest position are opened, the inspected pipe can be automatically put down, thereby achieving the purpose of automatic unloading. The device has a higher degree of automation and further improves the efficiency of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a top view of the utility model;

[0024] Figure 2 for Figure 1 A zoomed-in detail of position A in the middle;

[0025] Figure 3 It is the front view of the utility model;

[0026] Figure 4 This is a first-perspective stereogram of the present invention;

[0027] Figure 5 It is a second perspective stereogram of the utility model;

[0028] Figure 6 This is an enlarged detail view of the position of the sorting plate of the utility model;

[0029] Figure 7 It is a schematic diagram of the relative position relationship between the first rotating shaft and the cross bar of the utility model;

[0030] Figure 8 for Figure 7 Enlarged detail of position B in the middle;

[0031] Fig. 9 This is an enlarged detail view of the pipe fixing clamp of the utility model;

[0032] Fig.10 This is a schematic diagram of the internal structure of the transmission box in the pipe fixing clamp of the utility model from a first perspective;

[0033] Fig.11 This is a schematic diagram of the internal structure of the transmission box in the pipe fixing clamp of the utility model from a second viewing angle;

[0034] In the figure: 1 support seat, 101 first bracket, 102 first rotating shaft, 103 feeding turntable, 104 driving gear ring, 105 fourth bracket, 106 cross bar, 107 vertical bar, 108 first hemispherical stopper, 2 pipe fixing clamp, 201 lower support plate, 202 guide support ring, 203 transmission box, 204 trigger guide rod, 205 reset guide rod, 206 reset spring, 207 second hemispherical stopper, 208 transmission rod, 209 guide slide, 210 annular guide rail, 211 annular bracket, 212 L-shaped transmission rod, 213 connecting rod, 214 connecting piece, 215 clamping plate, 3 rotating motor, 301 motor reducer, 302 incomplete gear, 303 third bracket, 304 pressure-resistant hose, 4 first conveyor belt, 5 second conveyor belt, 501 sorting plate, 502 second bracket, 503 complete gear, 504 slide rail, 505 rack, 506 second cylinder. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0036] Reference Figure 1-11 A pipe clamping mechanism for hydrogen energy pipeline air tightness detection includes a feeding mechanism and a detection mechanism. The feeding mechanism includes a support seat 1. The top of the support seat 1 is rotatably mounted with a first rotating shaft 102 through a first bracket 101. A feeding turntable 103 is fixed on the first rotating shaft 102. A plurality of pipe fixing clamps 2 are mounted on the feeding turntable 103. The detection mechanism includes a detection plug 301. The detection plug 301 is connected to a high-pressure gas tank through a pressure-resistant hose 304. A pressure sensor is arranged in the detection plug 301. The detection plug 301 is driven by a first cylinder 302 to move horizontally and to be combined and separated with the pipeline.

[0037] The pipeline to be inspected is fixed on the feeding turntable 103 by the pipeline fixing clamp 2, and the feeding turntable 103 is rotated to transport each pipeline to the position of the detection plug 301 in turn. The detection plug 301 is driven by the first cylinder 302 to be inserted into the pipeline to be inspected. The detection plug 301 and the feeding turntable 103 are both provided with airtight rubber pads. The two ends of the pipeline are blocked by squeezing, and high-pressure gas is rushed into the inside of the pipeline to maintain sealing. The pressure change is detected by the pressure sensor. If the pressure does not drop rapidly, it means that the pipeline is qualified for air tightness. The purpose of fast feeding is achieved by the feeding turntable 103, thereby improving the detection efficiency. Example 2

[0038] Reference Figure 1-11 The difference between this embodiment and embodiment 1 is that a sorting plate 501 is rotatably mounted on the bottom end of the support seat 1 through a second bracket 502, and a first conveyor belt 4 and a second conveyor belt 5 are respectively provided on both sides below the sorting plate 501;

[0039] The first conveyor belt 4 and the second conveyor belt 5 respectively transport the qualified and unqualified pipes away, and separate the unqualified ones.

[0040] Among them, the conveying directions of the first conveyor belt 4 and the second conveyor belt 5 are opposite, and the first conveyor belt 4 and the second conveyor belt 5 are both conveyed in the direction away from each other, a complete gear 503 is fixed on the installation shaft of the sorting plate 501, a horizontally arranged rack 505 is slidably installed on the bottom end of the support seat 1 through a slide rail 504, the rack 505 is meshed with the complete gear 503, a second cylinder 506 is fixed on the bottom end of the support seat 1, and the output end of the second cylinder 506 is fixed to the rack 505, the first cylinder 302 is fixed to the top end of the third bracket 303, and the bottom end of the third bracket 303 is fixed to the outer shell of the second conveyor belt 5;

[0041] In order to achieve the purpose of sorting, when the inspected pipeline rotates to the lowest position of the feeding turntable 103, the pipeline fixing clamp 2 is controlled to loosen and put down the pipeline. Due to the existence of the sorting plate 501, the rack 505 can be driven to move horizontally by controlling the extension and contraction of the second cylinder 506, so that the sorting plate 501 can be driven to deflect through engagement. When the bottom end of the sorting plate 501 is facing the first conveyor belt 4, the pipeline will slide along the sorting plate 501 to the first conveyor belt 4 and then be transported away. When the bottom end of the sorting plate 501 is facing the second conveyor belt 5, the pipeline will fall onto the second conveyor belt 5 and be transported away, so that the angle of the sorting plate 501 can be changed according to whether the pipeline is qualified or not, thereby achieving the purpose of automatically separating defective products. Example 3

[0042] Reference Figure 1-11 The difference between this embodiment and embodiment 1 is that a driving gear ring 104 is fixed to the side of the feeding turntable 103 away from the pipe fixing clamp 2, a rotating motor 3 is fixed to the top of the support seat 1, the rotating motor 3 is equipped with a motor reducer 301, an incomplete gear 302 is fixed to the output end of the motor reducer 301, and the incomplete gear 302 is meshed with the driving gear ring 104;

[0043] The output angular velocity of the output shaft of the motor reducer 301 is reduced by the motor reducer 301, thereby driving the incomplete gear 302 to rotate at a low speed. Each rotation of the incomplete gear 302 will drive the driving gear ring 104 to rotate a small angle, and then drive the feeding turntable 103 to rotate a small angle. This angle is exactly the angle between the position of the adjacent pipe fixing clamp 2 and the center point of the feeding turntable 103, thereby achieving the purpose of intermittent feeding. Example 4

[0044] Reference Figure 1-11The difference between this embodiment and embodiment 3 is that the pipe fixing clamp 2 includes a lower support plate 201 and a transmission box 203. The transmission box 203 is fixed to one end of the lower support plate 201 and the bottom end of the lower support plate 201 is fixed to the feeding turntable 103. A guide support ring 202 is fixed between multiple lower support plates 201. A trigger guide rod 204 and a reset guide rod 205 are movably installed on the guide support ring 202. A reset spring 206 is installed on the outside of the reset guide rod 205. When the reset guide rod 205 is pressed by force, it will be pushed toward the transmission box 203, so that the reset spring 206 is compressed, thereby driving the trigger guide rod 204 to move in the transmission box 203. When the pressure disappears, the elastic force of the reset spring 206 will drive the trigger guide rod 204 to reset.

[0045] Among them, one end of the trigger guide rod 204 away from the transmission box 203 is fixed to the reset guide rod 205, and the other end of the trigger guide rod 204 is movably extended to the inside of the transmission box 203 and fixed with a transmission rod 208. The outside of the transmission rod 208 is provided with two symmetrically arranged guide grooves 209, and the guide grooves 209 extend in a spiral shape. Two L-shaped transmission rods 212 are also provided in the transmission box 203, one end of the L-shaped transmission rod 212 extends into the guide groove 209, and the other end of the L-shaped transmission rod 212 is fixed to the annular bracket 211;

[0046] When the guide rod 204 is triggered to move toward the transmission box 203, one end of the L-shaped transmission rod 212 is stuck in the guide slot 209, and the L-shaped transmission rod 212 is located inside the guide slot 209 and is divided into a smooth curved surface, and matches the inner wall of the guide slot 209. During the horizontal movement of the trigger guide rod 204, the L-shaped transmission rod 212 is always stuck in the guide slot 209. Since the guide slot 209 is a spiral extension, a deflection force can be given to the L-shaped transmission rod 212.

[0047] The annular bracket 211 is rotatably mounted in the transmission box 203 through the annular guide rail 210, and the annular guide rail 210 is coaxial with the transmission rod 208. A connecting rod 213 is fixed to the side away from each other of the two L-shaped transmission rods 212. One end of the connecting rod 213 away from the L-shaped transmission rod 212 extends to the outside of the transmission box 203 through the notch on the transmission box 203 and is fixed with a connecting piece 214. A clamping plate 215 is fixed to the side of the two connecting pieces 214 close to each other.

[0048] Due to the rotation limit of the annular bracket 211 and the annular guide rail 210, the L-shaped transmission rod 212 can only rotate around the axial direction of the transmission rod 208. Cooperating with the limiting function of the guide slot 209, since the two guide slots 209 are symmetrically arranged, when the guide rod 204 is triggered to move horizontally, the two L-shaped transmission rods 212 can be driven to deflect away from and toward each other, thereby driving the two clamping plates 215 to move away from and toward each other. When the reset guide rod 205 is pressed, the two clamping plates 215 separate and open. When the reset guide rod 205 is reset, the two clamping plates 215 are tightened again to clamp the pipe, so that loading and unloading can be efficient.

[0049] The first rotating shaft 102 is a hollow pipe structure, a fixed cross bar 106 is fixed to the top of the support seat 1 through the fourth bracket 105, the fixed cross bar 106 passes through the first rotating shaft 102, and the cross bar 106 and the first rotating shaft 102 can rotate relative to each other, two vertical rods 107 are fixed to one end of the fixed cross bar 106 away from the fourth bracket 105, a first hemispherical stopper 108 is fixed to one end of the vertical rod 107 away from the fixed cross bar 106, and a second hemispherical stopper 207 is fixed to one end of the reset guide rod 205 close to the first hemispherical stopper 108;

[0050] The two first hemispherical stoppers 108 are respectively located at the highest point and the lowest point of the feeding turntable 103, and the first hemispherical stoppers 108 are fixed to the fixed cross bar 106. When the feeding turntable 103 rotates, the first hemispherical stoppers 108 remain stationary. When the pipe fixing clamp 2 rotates to the highest point and the lowest point, the second hemispherical stopper 207 will contact the first hemispherical stopper 108 staying at that position. Since both have smooth curved surfaces, they can push the reset guide rod 205 to move toward the transmission box 203, thereby The clamping plates 215 can be driven to move away from each other. The two clamping plates 215 at the highest point can move away from each other, and the uninspected pipe can be placed on the top of the lower support plate 201 to complete the loading. When the pipe fixing clamp 2 is removed, the two clamping plates 215 will be reset close to each other by the elastic force of the reset spring 206, thereby automatically clamping the pipe. When the two clamping plates 215 at the lowest position are opened, the inspected pipe can be automatically put down, thereby achieving the purpose of automatic unloading. The device has a higher degree of automation and further improves the efficiency of detection.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0054] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pipe clamping mechanism for hydrogen energy pipeline air tightness detection, comprising a feeding mechanism and a detection mechanism, characterized in that: The feeding mechanism comprises a support seat (1), a first rotating shaft (102) being rotatably mounted on the top end of the support seat (1) via a first bracket (101), a feeding turntable (103) being fixed on the first rotating shaft (102), and a plurality of pipe fixing clamps (2) being mounted on the feeding turntable (103); The pipe fixing clamp (2) comprises a lower support plate (201) and a transmission box (203), wherein the transmission box (203) is fixed to one end of the lower support plate (201) and the feeding turntable (103) is fixed to the bottom end of the lower support plate (201).

2. The pipe clamping mechanism for hydrogen energy pipeline air tightness detection according to claim 1 is characterized in that: A guide support ring (202) is fixed between the plurality of lower support plates (201), a trigger guide rod (204) and a reset guide rod (205) are movably mounted on the guide support ring (202), and a reset spring (206) is mounted outside the reset guide rod (205).

3. The pipe clamping mechanism for hydrogen energy pipeline air tightness detection according to claim 2 is characterized in that: One end of the trigger guide rod (204) away from the transmission box (203) is fixed to the reset guide rod (205), and the other end of the trigger guide rod (204) movably extends into the interior of the transmission box (203) and is fixed with a transmission rod (208). Two symmetrically arranged guide grooves (209) are provided on the exterior of the transmission rod (208), and the guide grooves (209) extend in a spiral shape. Two L-shaped transmission rods (212) are also provided in the transmission box (203), one end of the L-shaped transmission rod (212) extends into the guide groove (209), and the other end of the L-shaped transmission rod (212) is fixed to the annular bracket (211).

4. The pipe clamping mechanism for hydrogen energy pipeline air tightness detection according to claim 3 is characterized in that: The annular bracket (211) is rotatably mounted in the transmission box (203) via an annular guide rail (210), and the annular guide rail (210) is coaxial with the transmission rod (208). A connecting rod (213) is fixed to the side of the two L-shaped transmission rods (212) that are away from each other. One end of the connecting rod (213) away from the L-shaped transmission rod (212) extends to the outside of the transmission box (203) through a notch on the transmission box (203) and is fixed with a connecting piece (214). A clamping plate (215) is fixed to the side of the two connecting pieces (214) that are close to each other.

5. The pipe clamping mechanism for hydrogen energy pipeline air tightness detection according to claim 4 is characterized in that: The first rotating shaft (102) is a hollow pipe structure. A fixed cross bar (106) is fixed to the top of the support seat (1) via a fourth bracket (105). The fixed cross bar (106) passes through the first rotating shaft (102), and the cross bar (106) and the first rotating shaft (102) can rotate relative to each other. Two vertical bars (107) are fixed to one end of the fixed cross bar (106) away from the fourth bracket (105). A first hemispherical stopper (108) is fixed to one end of the vertical bar (107) away from the fixed cross bar (106). A second hemispherical stopper (207) is fixed to one end of the reset guide rod (205) close to the first hemispherical stopper (108).

6. The pipe clamping mechanism for hydrogen energy pipeline air tightness detection according to claim 1, characterized in that: A driving gear ring (104) is fixed to a side of the feeding turntable (103) away from the pipe fixing clamp (2), a rotating motor (3) is fixed to the top of the support seat (1), the rotating motor (3) is equipped with a motor reducer (301), an incomplete gear (302) is fixed to the output end of the motor reducer (301), and the incomplete gear (302) is meshed with the driving gear ring (104).

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