Propeller shaft mounting device for ship

Abstract

The invention discloses a ship propeller shaft mounting device, and relates to the technical field of propeller shaft mounting, the ship propeller shaft mounting device comprises a supporting plate, the top surface of the supporting plate is fixedly connected with a centering plate, the top of the centering plate is a semicircular plate, four first sliding grooves and four second sliding grooves are formed in the circle center of the semicircular plate in a circumferential array mode, and the four first sliding grooves and the four second sliding grooves are communicated with each other. The four first sliding grooves and the four second sliding grooves are distributed in a crossed mode, and first centering claws are slidably connected into the first sliding grooves. The first centering claw and the second centering claw which are arranged in the axial direction in a staggered mode and the independent driving mechanism of the first centering claw and the second centering claw can sequentially conduct accurate radial positioning and clamping on the stern tube and the driving shaft. It is ensured that the axis of the stern tube and the driving shaft is forcibly adjusted to the theoretical center line in the assembling process, high coaxiality is achieved, traditional blind operation completely depending on visual observation and manual adjustment of workers is converted into concentric operation mechanically guaranteed by the device, and the problem that the driving shaft touches the inner wall of the stern tube during installation is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of propeller shaft installation technology, and in particular to a propeller shaft installation device for ships. Background Technology

[0002] In ship repair engineering, a crucial aspect of dock work is the inspection and replacement of shafting seals, which requires the propeller shaft to be removed from or installed in the stern tube. Currently, traditional methods rely heavily on manual experience and simple machinery. Specifically, when removing the propeller shaft from the stern towards the engine room, or inserting it from the engine room towards the stern tube, operators must manually adjust cranes, hoists, and other lifting equipment, and observe the shaft end position to indirectly control the shaft's spatial attitude. However, due to the propeller shaft's weight and length, and the confined space and obstructed view within the stern tube, the height and lateral position of the shaft end depend entirely on the operator's experience for judgment and adjustment, resulting in significant uncertainty and randomness throughout the process.

[0003] This experience-based, extensive operating method leads to two prominent technical problems: First, it is difficult to guarantee the accuracy of shaft alignment, which can easily cause uneven wear between the shaft and the inner wall of the stern tube during movement, increasing assembly resistance and even leading to improper installation. Second, and more seriously, the stern tube usually contains accessories such as lubrication oil pipes and sealing ring seats. When the propeller shaft is forced through without precise alignment, the finely machined working journal surface is easily scratched or roughened by these accessories. Once the journal surface is damaged, the repair process is extremely complicated, usually requiring on-site grinding, chrome plating, or even disassembly and transportation to a specialized factory for repair. This process is lengthy, costly, and causes significant direct economic losses and schedule delays for ship owners and repair companies. Summary of the Invention

[0004] The purpose of this invention is to provide a propeller shaft installation device for ships, in order to solve the problem mentioned in the background art that the alignment accuracy of the axis of the existing stern tube drive shaft cannot be guaranteed during the installation process, which leads to the drive shaft easily touching the inner wall of the stern tube during installation.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a propeller shaft mounting device for ships, comprising a support plate, a centering plate fixedly connected to the top surface of the support plate, the top of the centering plate being a semi-circular plate, and four sliding grooves one and four sliding grooves two arranged in a circular array along the center circumference of the semi-circular plate, the four sliding grooves one and four sliding grooves two being distributed intersectingly, a centering claw one being slidably connected inside the sliding groove one, and a centering claw two being slidably connected inside the sliding groove two; One side of the centering plate is rotatably connected to a turntable two arranged concentrically with the semicircular plate. The diameter of the turntable two is smaller than the diameter of the stern tube. One side of the centering plate is provided with a driving member. The driving member is used to drive the turntable two to rotate. Rotating the turntable two is used to drive the centering claw two to retract along the center of the semicircular plate. After the centering claw two retracts, it is used to fix the drive shaft. One side of the turntable 2 is rotatably connected to a turntable 1 arranged concentrically with the turntable 2. The top surface of the support plate is provided with a driving device. The driving device is used to drive the turntable 1 to rotate. Rotating the turntable 1 is used to drive the centering claw 1 to retract along the center of the semicircular plate. After the centering claw 1 retracts, it is used to fix the stern tube, so that the fixed stern tube is arranged concentrically with the drive shaft. The top surface of the support plate is provided with a support member for supporting the stern tube. The support member is provided with a pushing device and a limiting device to prevent the stern tube from dislodging from the support member. The pushing device is used to push one end of the stern tube to be exposed from the support member for fixing by the centering claw two. The top surface of the support plate is fixedly connected to a fixing plate for fixing the first turntable and the semi-circular plate to be arranged concentrically. A conveying groove is provided between the centering plate, the first turntable, the second turntable and the fixing plate. The conveying groove is used to convey the drive shaft.

[0006] Preferably, guide rods are fixedly connected inside both slide groove one and slide groove two, one end of centering claw one and centering claw two are slidably sleeved on the outer wall of the guide rod, and springs are sleeved on the outer wall of the guide rod. The top end of the spring abuts against the bottom surface of centering claw one or centering claw two, and the bottom end of the spring abuts against the inner wall of slide groove one or slide groove two.

[0007] Preferably, the turntable 2 has four drive grooves 2, the spacing between the four drive grooves 2 is the same as the spacing between the four sliding grooves 2, one end of the centering claw 2 is fixedly connected to a sliding rod 2, one end of the sliding rod 2 is slidably inserted into the drive groove 2, and the drive groove 2 is an inclined groove that is inclined relative to the radius direction of the turntable 2.

[0008] Preferably, the turntable is provided with four drive grooves, the four drive grooves are spaced at the same distance from the four sliding grooves and correspond one-to-one. One end of the centering claw is fixedly connected to a sliding rod, and one end of the sliding rod slides into the drive groove. The drive groove is an inclined groove that is inclined relative to the radius of the turntable.

[0009] Preferably, the driving component includes a driving motor fixed to one side of a centering plate, the output end of the driving motor passing through the centering plate and fixedly connected to a gear, and a gear ring two meshing with the gear being fixedly connected to the outer wall of the turntable two.

[0010] Preferably, the driving device includes a servo motor fixedly connected to the top surface of the support plate, a worm gear fixedly connected to the output end of the servo motor, a gear ring fixedly connected to one end of the turntable, the gear ring being rotatably connected to one side of the fixed plate, and the gear ring meshing with the worm gear.

[0011] Preferably, a pulley is fixedly connected to the side of the centering claw near the drive shaft, and the pulley is used for the movement of the drive shaft after centering.

[0012] Preferably, the support includes a support frame fixed to the top surface of the support plate, and the top surface of the support frame has a holding groove for placing the stern tube.

[0013] Preferably, the pushing device includes a cylinder fixedly connected to one end of a support frame, and a push plate fixedly connected to the output end of the cylinder.

[0014] Preferably, the limiting device includes two limiting plates fixedly connected to the end of the support frame away from the cylinder, and the two limiting plates are located in the gap between adjacent centering claw one and centering claw two.

[0015] The technical effects and advantages of this invention are as follows: The centering claws 1 and 2, which are staggered in the axial direction, and their independent drive mechanisms can accurately position and clamp the stern tube and the drive shaft radially in sequence. This ensures that the axis of the stern tube and the drive shaft is forcibly adjusted to the theoretical center line during the assembly process, achieving a high degree of coaxiality. This transforms the traditional blind operation that relies entirely on the worker's visual inspection and manual adjustment into a concentric operation guaranteed by the device's mechanics, effectively avoiding the problem of the drive shaft touching the inner wall of the stern tube during installation. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the centering plate and turntable structure of the present invention.

[0018] Figure 3 This is a schematic diagram of the centering plate and turntable structure of the present invention.

[0019] Figure 4 This is a schematic diagram of the centering plate structure of the present invention. Figure 1 .

[0020] Figure 5 This is a schematic diagram of the centering plate structure of the present invention. Figure 2 .

[0021] Figure 6 This is a schematic diagram of the support structure of the present invention.

[0022] In the diagram: 1. Support plate; 2. Centering plate; 21. Slide groove one; 22. Slide groove two; 23. Guide rod; 231. Spring; 24. Centering claw one; 25. Centering claw two; 251. Pulley; 3. Turntable one; 31. Drive groove one; 32. Slide rod one; 33. Gear ring one; 4. Turntable two; 41. Drive groove two; 42. Slide rod two; 43. Gear ring two; 5. Drive motor; 51. Gear; 6. Servo motor; 61. Worm gear; 7. Fixing plate; 71. Conveying groove; 8. Stern tube; 81. Drive shaft; 9. Support frame; 91. Holding groove; 92. Cylinder; 93. Push plate; 94. Limiting plate. Detailed Implementation

[0023] 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.

[0024] This invention provides, for example Figure 1-6 The illustrated propeller shaft mounting device for a ship includes a support plate 1, a centering plate 2 fixedly connected to the top surface of the support plate 1, the top of the centering plate 2 being a semi-circular plate, and four sliding grooves 21 and four sliding grooves 22 arranged in a circular array along the center of the semi-circular plate, the four sliding grooves 21 and four sliding grooves 22 being distributed intersectingly, a centering claw 24 being slidably connected inside the sliding groove 21, and a centering claw 25 being slidably connected inside the sliding groove 22; A turntable 4 is rotatably connected to one side of the centering plate 2, which is concentrically arranged with the semicircular plate. The diameter of the turntable 4 is smaller than the diameter of the stern tube 8. A driving component is provided on one side of the centering plate 2. The driving component is used to drive the turntable 4 to rotate. The rotating turntable 4 is used to drive the centering claw 25 to retract along the center of the semicircular plate. After the centering claw 25 retracts, it is used to fix the drive shaft 81. Turntable 2 4 is rotatably connected to turntable 1 3, which is arranged concentrically with turntable 2 4. The top surface of support plate 1 is provided with a driving device. The driving device is used to drive turntable 1 3 to rotate. Turntable 1 3 is used to drive centering claw 24 to retract along the center of the semicircular plate. After centering claw 24 retracts, it is used to fix stern tube 8, so that the fixed stern tube 8 is arranged concentrically with drive shaft 81. The top surface of the support plate 1 is provided with a support member for supporting the stern tube 8. The support member is provided with a pushing device and a limiting device to prevent the stern tube 8 from dislodging from the support member. The pushing device is used to push one end of the stern tube 8 out of the support member for fixing the centering claw 25. The top surface of the support plate 1 is fixedly connected to a fixing plate 7 for fixing the turntable 3 and the semi-circular plate to be arranged concentrically. A conveying groove 71 is provided between the centering plate 2, the turntable 3, the turntable 4 and the fixing plate 7. The conveying groove 71 is used to convey the drive shaft 81. The main body of this invention is a horizontally positioned support plate 1. A centering plate 2 is vertically fixed on the support plate 1, and the upper part of the centering plate 2 is machined into a semi-circular outline. Centered on the centering plate 2, four sliding grooves 21 and four sliding grooves 22 are alternately machined along the circumference. A sliding centering claw 24 is installed in the sliding groove 21, and a sliding centering claw 25 is installed in the sliding groove 22. On one side of the centering plate 2, a turntable 4 and a turntable 3 are coaxially mounted sequentially. The diameter of the turntable 4 is designed to be smaller than the inner diameter of the stern tube 8 to be installed, to prevent the stern tube 8 from affecting the tightening of the centering claw 25 when clamping the drive shaft 81. The rotation of the turntable 4 and the turntable 3 is controlled by independent driving components and driving devices, thereby driving the centering claw 25 to radially retract to clamp the drive shaft 81, and driving the centering claw 24 to radially retract to clamp the stern tube 8. The support plate 1 is also equipped with a support component with pushing and limiting functions, which is used to support and axially position the stern tube 8. The conveying grooves 71 coaxially opened on all the turntables and centering plates 2 together form the passage of the drive shaft 81; This invention achieves step-by-step, independent automatic centering of the stern tube 8 and the internal drive shaft 81 during disassembly and assembly by setting up two sets of independently controlled centering claws. This replaces the traditional "blind operation" relying on manual experience, solves the problem of journal scratches caused by misalignment, and greatly improves operational accuracy and safety. The design of the support component and the conveyor trough 71 enables a streamlined operation from loading the stern tube 8 to the passage of the drive shaft 81, further improving disassembly and assembly efficiency.

[0025] like Figure 4 As shown, guide rods 23 are fixedly connected inside both slide groove 1 21 and slide groove 22. One end of centering claw 1 24 and centering claw 25 is slidably sleeved on the outer wall of guide rod 23. Springs 231 are sleeved on the outer wall of guide rod 23. The top end of spring 231 abuts against the bottom surface of centering claw 1 24 or centering claw 25, and the bottom end of spring 231 abuts against the inner wall of slide groove 1 21 or slide groove 22. A guide rod 23 is fixedly installed inside slide groove 21 and slide groove 22. Corresponding centering claws 24 and 25 have through holes machined at their bottoms and are fitted onto the guide rod 23 to achieve precise radial linear guidance. A compression spring 231 is fitted onto the guide rod 23, with one end of the spring 231 pressing against the bottom of the centering claw and the other end pressing against the bottom of the slide groove, providing the centering claw with a pre-tightening reset force that always points towards the center. Guide rod 23 ensures the stability and straightness of the centering claw during radial movement, avoiding jamming and wobbling, and guaranteeing the foundation of centering accuracy. Spring 231 provides an automatic reset function; when the drive disc reverses and releases, the centering claw can automatically and smoothly return to the open position under the force of spring 231.

[0026] like Figure 2 As shown, four drive slots 41 are provided on the turntable 2 4. The spacing between the four drive slots 41 is the same as the spacing between the four sliding slots 22. One end of the centering claw 2 25 is fixedly connected to the sliding rod 2 42, and one end of the sliding rod 2 42 is slidably inserted into the drive slot 2 41. The turntable 24 has four drive grooves 241 machined on it, corresponding to the positions of the slide grooves 22. The end of the slide rod 242 fixedly connected to the centering claw 25 is inserted into the corresponding drive groove 241. The rotational motion of turntable 24 is converted into precise radial linear motion of centering claw 25 through the cooperation of slide rod and inclined groove. Specifically, turntable 24 rotates, and drive groove 241, machined on turntable 24, rotates with it. Its direction is not along the pure radial direction of turntable 24, but at an angle to the radial direction. Slide rod 242 has one end fixed to centering claw 25 and the other end inserted into drive groove 241. Centering claw 25 itself is confined in the slide groove 22 of centering plate 2, and can only perform strict radial linear motion, and cannot move or rotate tangentially.

[0027] like Figure 2 As shown, four drive slots 31 are provided on the turntable 3. The four drive slots 31 are spaced at the same distance from the four sliding slots 21 and correspond one-to-one. One end of the centering claw 24 is fixedly connected to a sliding rod 32. One end of the sliding rod 32 slides into the drive slot 31. The drive slot 31 is an inclined slot that is inclined relative to the radius of the turntable 3. Four drive slots 31 are machined on the turntable 3, corresponding to the positions of the slide grooves 21. The ends of the slide rods 32 fixedly connected to the centering claw 24 are inserted into the corresponding drive slots 31. The drive slots 31 are also designed as inclined slots, and the movement principle of the centering claw 24 is the same as that of the centering claw 25.

[0028] like Figure 3 As shown, the driving component includes a drive motor 5 fixed to one side of the centering plate 2. The output end of the drive motor 5 passes through the centering plate 2 and is fixedly connected to a gear 51. A gear ring 43 that meshes with the gear 51 is fixedly connected to the outer wall of the turntable 4. The drive unit specifically consists of a drive motor 5 fixed to the back of the centering plate 2. The motor output shaft passes through the centering plate 2 and a small gear 51 is installed at its end. A gear ring 43 is fixedly installed on the outer circumference of the turntable 4, and the gear ring 43 meshes with the small gear 51 on the motor output shaft.

[0029] like Figure 1 As shown, the drive device includes a servo motor 6 fixedly connected to the top surface of the support plate 1, a worm gear 61 fixedly connected to the output end of the servo motor 6, a gear ring 33 fixedly connected to one end of the turntable 3, the gear ring 33 being rotatably connected to one side of the fixed plate 7, and the gear ring 33 being meshed with the worm gear 61. The drive unit specifically consists of a servo motor 6 fixed on the support plate 1. The output shaft of the servo motor 6 is connected to a worm gear 61. A gear ring 33 is fixed along the circumference of the turntable 3. The gear ring 33 is rotatably connected to the fixed plate 7 through bearings or other means, and its teeth mesh with the worm gear 61 driven by the servo motor 6.

[0030] like Figure 5 As shown, a pulley 251 is fixedly connected to the side of the centering claw 25 near the drive shaft 81. The pulley 251 is used for the movement of the drive shaft 81 after it has been centered. On the inner side of each centering claw 25, one or more freely rotatable pulleys 251 are mounted via shafts and bearings. When the drive shaft 81 is held by the centering claw 25, the outer surface of the drive shaft 81 contacts the circumferential surface of these pulleys 251. The pulley 251 converts the sliding friction between the drive shaft 81 and the centering claw into rolling friction. When the drive shaft 81 needs to be axially pulled or inserted, the pulley 251 rolls accordingly, thereby greatly reducing the resistance to axial movement. This not only makes operation less strenuous, but more importantly, it avoids scratches on the journal surface, providing additional protection.

[0031] like Figure 6 As shown, the support includes a support frame 9 fixed to the top surface of the support plate 1, and the top surface of the support frame 9 is provided with a holding groove 91 for placing the stern tube 8. The support is a support frame 9 fixed on the main support plate 1. On the top surface of the support frame 9, a V-shaped holding groove 91 that matches the outer circular surface of the stern tube 8 is machined along its length to support the stern tube 8.

[0032] like Figure 6 As shown, the pushing device includes a cylinder 92 fixedly connected to one end of a support frame 9, and a push plate 93 fixedly connected to the output end of the cylinder 92; A cylinder 92 is installed at one end of the support frame 9. A push plate 93 is connected to the piston rod end of the cylinder 92. When the stern tube 8 is placed into the holding tank 91, the cylinder 92 is activated, and the push plate 93 pushes the stern tube 8 to move axially toward the centering plate 2.

[0033] like Figure 6As shown, the limiting device includes two limiting plates 94 fixedly connected to the end of the support frame 9 away from the cylinder 92. The two limiting plates 94 are located in the gap between the adjacent centering claw 1 24 and centering claw 25. Two parallel limiting plates 94 are vertically fixed on the other end of the support frame 9, away from the cylinder 92. The gap between the two limiting plates 94 is exactly aligned with the axial gap space between the centering claw 1 24 and the centering claw 25 on the centering plate 2. The two limiting plates 94 form a precise axial positioning stop. This not only prevents the stern tube 8 from extending excessively under the push of the cylinder 92, but also ensures that the stern tube 8 is pushed to a preset, precise axial position through alignment with the centering claw. In this position, the end of the stern tube 8 can be effectively clamped by the centering claw 24, making it a key positioning component for achieving coordinated operation of the entire device.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A propeller shaft mounting device for ships, comprising a support plate (1), characterized in that: The top surface of the support plate (1) is fixedly connected to a centering plate (2). The top of the centering plate (2) is a semi-circular plate. Along the center circumference of the semi-circular plate, there are four sliding grooves (21) and four sliding grooves (22). The four sliding grooves (21) and the four sliding grooves (22) are distributed in a cross pattern. The interior of the sliding groove (21) is slidably connected to a centering claw (24), and the interior of the sliding groove (22) is slidably connected to a centering claw (25). One side of the centering plate (2) is rotatably connected to a turntable two (4) arranged concentrically with the semicircular plate. The diameter of the turntable two (4) is smaller than the diameter of the stern tube (8). One side of the centering plate (2) is provided with a driving member. The driving member is used to drive the turntable two (4) to rotate. Rotating the turntable two (4) is used to drive the centering claw two (25) to retract along the center of the semicircular plate. After the centering claw two (25) retracts, it is used to fix the drive shaft (81). One side of the turntable 2 (4) is rotatably connected to the turntable 1 (3) arranged concentrically with the turntable 2 (4). The top surface of the support plate (1) is provided with a driving device. The driving device is used to drive the turntable 1 (3) to rotate. Rotating the turntable 1 (3) is used to drive the centering claw 1 (24) to retract along the center of the semicircular plate. After the centering claw 1 (24) retracts, it is used to fix the stern tube (8), so that the fixed stern tube (8) is arranged concentrically with the drive shaft (81). The top surface of the support plate (1) is provided with a support member for supporting the stern tube (8). The support member is provided with a pushing device and a limiting device to prevent the stern tube (8) from dislodging from the support member. The pushing device is used to push one end of the stern tube (8) to be exposed from the support member for fixing the centering claw two (25). The top surface of the support plate (1) is fixedly connected to a fixing plate (7) for fixing the turntable (3) and the semicircular plate to be arranged concentrically. A conveying groove (71) is provided between the centering plate (2), the turntable (3), the turntable (4) and the fixing plate (7). The conveying groove (71) is used to convey the drive shaft (81).

2. The propeller shaft mounting device for ships according to claim 1, characterized in that: Guide rods (23) are fixedly connected inside both the first slide (21) and the second slide (22). One end of the first centering claw (24) and the second centering claw (25) are slidably sleeved on the outer wall of the guide rod (23). Springs (231) are sleeved on the outer wall of the guide rod (23). The top end of the spring (231) abuts against the bottom surface of the first centering claw (24) or the second centering claw (25), and the bottom end of the spring (231) abuts against the inner wall of the first slide (21) or the second slide (22).

3. The propeller shaft mounting device for ships according to claim 1, characterized in that: The turntable 2 (4) has four drive grooves 2 (41) with the same spacing as the four sliding grooves 2 (22). One end of the centering claw 2 (25) is fixedly connected to a sliding rod 2 (42). One end of the sliding rod 2 (42) is slidably inserted into the drive groove 2 (41). The drive groove 2 (41) is an inclined groove that is inclined relative to the radius of the turntable 2 (4).

4. The propeller shaft mounting device for ships according to claim 1, characterized in that: The turntable (3) has four drive slots (31) with the same spacing and correspond to the four sliding slots (21). One end of the centering claw (24) is fixedly connected to a sliding rod (32). One end of the sliding rod (32) slides into the drive slot (31). The drive slot (31) is an inclined slot that is inclined relative to the radius of the turntable (3).

5. The propeller shaft mounting device for ships according to claim 1, characterized in that: The driving component includes a drive motor (5) fixed on one side of a centering plate (2). The output end of the drive motor (5) passes through the centering plate (2) and is fixedly connected to a gear (51). The outer wall of the turntable (4) is fixedly connected to a gear ring (43) that meshes with the gear (51).

6. The propeller shaft mounting device for ships according to claim 1, characterized in that: The driving device includes a servo motor (6) fixedly connected to the top surface of the support plate (1), a worm gear (61) fixedly connected to the output end of the servo motor (6), a gear ring (33) fixedly connected to one end of the turntable (3), the gear ring (33) being rotatably connected to one side of the fixed plate (7), and the gear ring (33) being meshed with the worm gear (61).

7. A marine propeller shaft mounting device according to claim 1, characterized in that: The centering claw 2 (25) has a pulley (251) fixedly connected to the side near the drive shaft (81), and the pulley (251) is used for the movement of the drive shaft (81) after centering.

8. A marine propeller shaft mounting device according to claim 1, characterized in that: The support includes a support frame (9) fixed to the top surface of the support plate (1), and the top surface of the support frame (9) is provided with a holding slot (91) for placing the stern tube (8).

9. A marine propeller shaft mounting device according to claim 1, characterized in that: The pushing device includes a cylinder (92) fixedly connected to one end of a support frame (9), and a push plate (93) is fixedly connected to the output end of the cylinder (92).

10. A marine propeller shaft mounting device according to claim 9, characterized in that: The limiting device includes two limiting plates (94) fixedly connected to the end of the support frame (9) away from the cylinder (92), and the two limiting plates (94) are located in the gap between adjacent centering claw one (24) and centering claw two (25).

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