A nacelle cover angle fixing device

Abstract

The application belongs to the technical field of wind power generation, and particularly relates to a cabin cover angle fixing device, which comprises a supporting leg, a square frame arranged on the supporting leg, a translation mechanism arranged on the square frame, an angle adjusting mechanism arranged on the translation mechanism, and an inner cabin top suction disc mechanism arranged on the angle adjusting mechanism. The translation mechanism comprises a longitudinal translation assembly and a transverse translation assembly, the longitudinal translation assembly is arranged on the square frame, and the transverse translation assembly is arranged on the longitudinal translation assembly. Through the arrangement of the translation mechanism, the rotation of the first motor and the second motor, and the transmission of the first lead screw and the second lead screw, the lifting cylinder and the angle adjusting mechanism can be flexibly moved forward and backward and left and right, the position of the cabin upper cover can be conveniently adjusted, the arrangement of the angle adjusting mechanism, the cooperative action of the third cylinder and the fourth cylinder and the first cylinder and the second cylinder enable the angle adjusting plate to be inclined, so that the inclination angle of the cabin upper cover can be adjusted.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wind power generation, and particularly relates to a nacelle cover angle fixing device. BACKGROUND

[0002] The nacelle cover of a wind turbine is an important component of a wind power generation device, which mainly covers the nacelle part of the wind turbine to protect the internal components of the nacelle and isolate the external environment. The wind turbine is usually installed on a high-altitude tower of tens of meters or even hundreds of meters to ensure that the wind wheel can capture more wind energy. During installation, the nacelle cover is divided into an upper nacelle cover and a lower nacelle cover for assembly.

[0003] When installing the nacelle of the wind turbine on the high-altitude tower, a key step is to fix the angle of the upper nacelle cover and the lower nacelle cover. This step is crucial to ensure the stability and operating efficiency of the entire wind turbine. However, the existing technology mainly relies on ground cranes to lift the upper nacelle cover to high altitude, and then manually calibrate and adjust the angle. This method is not only inefficient, but also has safety hazards. Due to the complex high-altitude working environment, manual calibration often fails to achieve accurate angle requirements, which not only affects the installation quality of the wind turbine, but also may adversely affect its subsequent operating performance. SUMMARY

[0004] To solve the above problems, the application provides a nacelle cover angle fixing device.

[0005] The technical scheme adopted by the application is as follows: The application provides a nacelle cover angle fixing device, which comprises a support leg, a square frame is arranged on the support leg, a translation mechanism is arranged on the square frame, an angle adjustment mechanism is arranged on the translation mechanism, and an inner cabin top suction disc mechanism is arranged on the angle adjustment mechanism.

[0006] Further, the longitudinal translation assembly comprises a first motor, the first motor is arranged on one side of the inner wall of the square frame, one end of the output end of the first motor is provided with a driving pipe, the other end of the driving pipe is rotatably arranged on the other inner wall of the square frame, a bevel gear one is sleeved on the driving pipe, a sliding rod is arranged on the outer wall of the square frame, a first lead screw is rotatably arranged on the outer wall of the square frame, one end of the first lead screw is provided with a bevel gear two, the bevel gear one and the bevel gear two are rotatably connected in meshing, a first moving block is slidably sleeved on the sliding rod, the first moving block is sleeved on the first lead screw, and the first lead screw and the first moving block are threadedly connected.

[0007] Further, the lateral translation assembly comprises a lifting cylinder, the lifting cylinder is arranged on the first moving block, the output end of the lifting cylinder is provided with a lifting plate, the lifting plate is internally provided with a first long slot, the first long slot is internally provided with a sliding groove, the first sliding block is slidingly arranged in the sliding groove, the upper end of the first sliding block is provided with a support rod, the upper end of the support rod is provided with a second moving block, the lower end of the second moving block is provided with a sleeve, one end of the lifting plate is externally provided with a second motor, the output end of the second motor is provided with a second lead screw, the other end of the second lead screw is rotatably arranged on the inner side wall of the first long slot, the sleeve is sleeved on the second lead screw, and the second lead screw and the sleeve are in threaded connection.

[0008] Further, the angle adjustment mechanism comprises a first tilting assembly and a third tilting assembly, the third tilting assembly is arranged on the second moving block, and the first tilting assembly is arranged on the third tilting assembly.

[0009] Further, the third tilting assembly comprises a second fixed column, the second fixed column is arranged on the second moving block, the upper end of the second fixed column is hingedly connected with the angle adjustment plate, one side of the upper end of the second moving block is hingedly connected with the cylinder seat of the third cylinder, the output end of the third cylinder is hingedly connected with one side of the lower end of the angle adjustment plate, the other side of the upper end of the second moving block is hingedly connected with the cylinder seat of the fourth cylinder, and the output end of the fourth cylinder is hingedly connected with the other side of the lower end of the angle adjustment plate.

[0010] Further, the first tilting assembly comprises a first fixed column, the first fixed column is arranged on the angle adjustment plate, the upper end of the first fixed column is connected with the support cavity, one side of the upper end of the angle adjustment plate is hingedly connected with the cylinder seat of the first cylinder, the output end of the first cylinder is hingedly connected with one side of the lower end of the support cavity, the other side of the upper end of the angle adjustment plate is hingedly connected with the cylinder seat of the second cylinder, and the output end of the second cylinder is hingedly connected with the other side of the lower end of the support cavity.

[0011] Further, the inner cabin top suction disc mechanism comprises a suction assembly and a fixing assembly, the suction assembly is arranged in the support cavity, and the fixing assembly is arranged in the support cavity.

[0012] Further, the suction assembly comprises a magnetorheological fluid cavity, the magnetorheological fluid cavity is arranged at the inner top end of the support cavity, the inner bottom end of the magnetorheological fluid cavity is provided with a spring, the upper end of the spring is provided with a second sliding block, the second sliding block is slidingly arranged in the magnetorheological fluid cavity, the second sliding block is provided with a solution flow hole, the upper end of the second sliding block is provided with a buffer rod, and the upper end of the buffer rod is provided with an electric suction disc.

[0013] Further, the fixing assembly comprises a controller arranged at the inner bottom end of the supporting cavity, an electromagnetic coil is wound on the outer sidewall of the magneto-rheological fluid cavity, the electromagnetic coil is connected to the controller, the controller is connected to a power supply, and the magneto-rheological fluid cavity is provided with magneto-rheological fluid.

[0014] Further, the upper end of the supporting cavity is provided with a sealing ring which is slidingly sleeved on the buffer rod.

[0015] The application has the following beneficial effects by adopting the above structure:

[0016] (1) The setting of the inner cabin top suction disc mechanism realizes efficient and stable adsorption of the cabin upper cover by the combined use of the electric suction disc and the magneto-rheological fluid, and ensures the stability and safety during installation.

[0017] (2) The setting of the inner cabin top suction disc mechanism can effectively cope with the unevenness of the inner top surface of the cabin upper cover, and improves the universality and adaptability of the device.

[0018] (3) The setting of the translation mechanism, the rotation of the first motor and the second motor, and the transmission of the first lead screw and the second lead screw enable the lifting cylinder and the angle adjustment mechanism to move flexibly forward and backward and left and right, facilitating the adjustment of the position of the cabin upper cover.

[0019] (4) The setting of the angle adjustment mechanism and the cooperative action of the third cylinder and the fourth cylinder, the first cylinder and the second cylinder enable the angle adjustment plate to be inclined, thereby adjusting the inclination angle of the cabin upper cover and meeting the complex installation requirements.

[0020] (5) The setting of the downward pressing patch mechanism reduces the need for manual intervention, thereby speeding up the production, and since the conductive paste can accurately and quickly reach the designated position, it also helps to shorten the overall processing time.

[0021] (6) The application has reasonable design and simple operation, and can significantly improve the angle positioning efficiency and accuracy of the wind turbine cabin cover during installation. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1 is a front view of the angle fixing device for the cabin cover of the present application;

[0024] Figure 2It is a front view of the cabin cover angle fixing device for the application;

[0025] Figure 3 It is a right view of the cabin cover angle fixing device for the application;

[0026] Figure 4 It is a right view of the cabin cover angle fixing device for the application;

[0027] Figure 5 It is a longitudinal translation component structure schematic diagram;

[0028] Figure 6 It is a support cavity internal structure schematic diagram;

[0029] Figure 7 It is Figure 6 A partial enlarged view of part A;

[0030] Figure 8 It is Figure 4 A partial enlarged view of part B;

[0031] Figure 9 It is Figure 2 A partial enlarged view of part C;

[0032] Figure 10 It is Figure 5 A partial enlarged view of part D.

[0033] 1, square frame, 2, translation mechanism, 3, angle adjustment mechanism, 4, inner cabin top suction disc mechanism, 6, support leg, 7, longitudinal translation component, 8, transverse translation component, 9, first motor, 10, drive pipe, 11, bevel gear one, 12, bevel gear two, 13, first lead screw, 14, sliding rod, 15, first moving block, 16, lifting cylinder, 17, lifting plate, 18, first long slot, 19, sliding groove, 20, second motor, 21, second lead screw, 22, sleeve, 23, first sliding block, 24, second moving block, 25, first inclination component, 27, third inclination component, 28, first fixed column, 29, first cylinder, 30, second cylinder, 31, support cavity, 32, third cylinder, 33, fourth cylinder, 34, second fixed column, 35, angle adjustment plate, 36, magnetorheological fluid cavity, 37, second sliding block, 38, spring, 39, solution flow hole, 40, electromagnetic coil, 41, buffer rod, 42, electric suction disc, 43, controller, 44, support rod, 45, adsorption component, 46, fixed component, 47, sealing ring. DETAILED DESCRIPTION

[0034] In order to make the purpose, characteristics and advantages of the present application more obvious and easy to understand, the technical solutions in the present application will be clearly and completely described below in combination with the drawings in the specific embodiments. Obviously, the following described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present patent, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present patent.

[0035] As shown in Figures 1-10 The present application proposes a cabin cover angle fixing device, which comprises a support leg 6, a square frame 1 arranged on the support leg 6, a translation mechanism 2 arranged on the square frame 1, an angle adjusting mechanism 3 arranged on the translation mechanism 2, and an inner cabin top suction disc mechanism 4 arranged on the angle adjusting mechanism 3.

[0036] The longitudinal translation assembly 7 comprises a first motor 9, a drive pipe 10, a bevel gear one 11, a bevel gear two 12, a first lead screw 13, a sliding rod 14, and a first moving block 15. The first motor 9 is arranged on one side of the inner wall of the square frame 1. One end of the output end of the first motor 9 is provided with the drive pipe 10. The other end of the drive pipe 10 is rotatably arranged on the other inner wall of the square frame 1. The drive pipe 10 is sleeved with the bevel gear one 11. The outer wall of the square frame 1 is provided with the sliding rod 14. The outer wall of the square frame 1 is rotatably provided with the first lead screw 13. One end of the first lead screw 13 is provided with the bevel gear two 12. The bevel gear one 11 and the bevel gear two 12 are rotatably connected in meshing. The first moving block 15 is slidably sleeved on the sliding rod 14. The first moving block 15 is sleeved on the first lead screw 13. The first lead screw 13 and the first moving block 15 are threadedly connected.

[0037] The transverse translation assembly 8 comprises a lifting cylinder 16, a lifting plate 17, a first long slot 18, a sliding groove 19, a second motor 20, a second lead screw 21, a sleeve pipe 22, a first sliding block 23, a second moving block 24, and a support rod 44. The lifting cylinder 16 is arranged on the first moving block 15. The output end of the lifting cylinder 16 is provided with the lifting plate 17. The lifting plate 17 is internally provided with the first long slot 18. The first long slot 18 is internally provided with the sliding groove 19. The first sliding block 23 is slidably arranged in the sliding groove 19. The upper end of the first sliding block 23 is provided with the support rod 44. The upper end of the support rod 44 is provided with the second moving block 24. The lower end of the second moving block 24 is provided with the sleeve pipe 22. The outer end of the lifting plate 17 is provided with the second motor 20. The output end of the second motor 20 is provided with the second lead screw 21. The other end of the second lead screw 21 is rotatably arranged on the inner side wall of the first long slot 18. The sleeve pipe 22 is sleeved on the second lead screw 21. The second lead screw 21 and the sleeve pipe 22 are threadedly connected.

[0038] The angle adjusting mechanism 3 comprises a first tilting assembly 25 and a third tilting assembly 27, and the third tilting assembly 27 is arranged on the second moving block 24, and the first tilting assembly 25 is arranged on the third tilting assembly 27.

[0039] The third tilting assembly 27 comprises a third cylinder 32, a fourth cylinder 33 and a second fixed column 34, the second fixed column 34 is arranged on the second moving block 24, the upper end of the second fixed column 34 is hinged to an angle adjusting plate 35, the upper end of one side of the second moving block 24 is hinged to a cylinder base of the third cylinder 32, the output end of the third cylinder 32 is hinged to one side of the lower end of the angle adjusting plate 35, the upper end of the other side of the second moving block 24 is hinged to a cylinder base of the fourth cylinder 33, and the output end of the fourth cylinder 33 is hinged to the other side of the lower end of the angle adjusting plate 35.

[0040] The first tilting assembly 25 comprises a first fixed column 28, a first cylinder 29, a second cylinder 30, a supporting cavity 31 and the angle adjusting plate 35, the first fixed column 28 is arranged on the angle adjusting plate 35, the upper end of the first fixed column 28 is connected to the supporting cavity 31, the upper end of one side of the angle adjusting plate 35 is hinged to a cylinder base of the first cylinder 29, the output end of the first cylinder 29 is hinged to one side of the lower end of the supporting cavity 31, the upper end of the other side of the angle adjusting plate 35 is hinged to a cylinder base of the second cylinder 30, and the output end of the second cylinder 30 is hinged to the other side of the lower end of the supporting cavity 31.

[0041] The inner cabin top suction disc mechanism 4 comprises a suction assembly 45 and a fixed assembly 46, the suction assembly 45 is arranged in the supporting cavity 31, and the fixed assembly 46 is arranged in the supporting cavity 31.

[0042] The suction assembly 45 comprises a magnetorheological fluid cavity 36, a second sliding block 37, a spring 38, a solution flow hole 39, a buffer rod 41 and an electric suction disc 42, the magnetorheological fluid cavity 36 is arranged at the inner top end of the supporting cavity 31, the inner bottom end of the magnetorheological fluid cavity 36 is provided with the spring 38, the upper end of the spring 38 is provided with the second sliding block 37, the second sliding block 37 is slidingly arranged in the magnetorheological fluid cavity 36, the second sliding block 37 is provided with the solution flow hole 39, the upper end of the second sliding block 37 is provided with the buffer rod 41, and the upper end of the buffer rod 41 is provided with the electric suction disc 42.

[0043] The fixed assembly 46 comprises an electromagnetic coil 40 and a controller 43, the controller 43 is arranged at the inner bottom end of the supporting cavity 31, the electromagnetic coil 40 is wound on the outer side wall of the magnetorheological fluid cavity 36, the electromagnetic coil 40 is connected to the controller 43, the controller 43 is connected to a power supply, and the magnetorheological fluid cavity 36 is provided with magnetorheological fluid.

[0044] The upper end of the supporting cavity 31 is provided with a sealing ring 47, and the sealing ring 47 is slidingly sleeved on the buffer rod 41.

[0045] In specific use, when installing the upper nacelle cover and the lower nacelle cover of the wind turbine nacelle cover, the device is installed on the lower nacelle cover, the upper nacelle cover is lifted by the ground crane, and is slowly moved to the upper side of the device. The output end of the lifting cylinder 16 drives the lifting plate 17 to move upward, the lifting plate 17 drives the second moving block 24 to move upward, the second moving block 24 drives the first fixed column 28 to move upward, the first fixed column 28 drives the support cavity 31 to move upward, the support cavity 31 drives the electric suction disc 42 to move upward, until the inner top surface of the upper nacelle cover is contacted, a plurality of electric suction discs 42 are arranged on the support cavity 31, and are used to cope with the uneven places of the inner top surface of the upper nacelle cover. When the suction assembly 45 is adsorbed to the upper nacelle cover, the spring 38 is compressed, the second sliding block 37 slides in the magnetorheological fluid cavity 36, the magnetorheological fluid flows through the solution flow hole 39, the electromagnetic coil 40 is powered, the controller 43 adjusts the current flowing through the electromagnetic coil 40, the strength of the magnetic field can be accurately controlled, the rheological properties of the magnetorheological fluid are adjusted, the magnetorheological fluid changes from liquid to solid, the adsorption and fixation of the upper nacelle cover are completed, subsequently, the output end of the first motor 9 drives the driving pipe 10 to rotate, the driving pipe 10 drives the bevel gear one 11 to rotate, the bevel gear one 11 drives the bevel gear two 12 to rotate, the bevel gear two 12 drives the first lead screw 13 to rotate, the first lead screw 13 drives the first moving block 15 to move forward and backward, thereby driving the lifting cylinder 16 to move forward and backward, the lifting cylinder 16 drives the lifting plate 17 to move forward and backward, the lifting plate 17 drives the angle adjusting mechanism 3 to move forward and backward, the angle adjusting mechanism 3 drives the inner nacelle top suction disc mechanism 4 to move forward and backward, the inner nacelle top suction disc mechanism 4 drives the upper nacelle cover to move forward and backward, the output end of the second motor 20 drives the second lead screw 21 to rotate, the second lead screw 21 drives the sleeve pipe 22 to move left and right, the sleeve pipe 22 drives the second moving block 24 to move left and right, the second moving block 24 drives the angle adjusting mechanism 3 to move left and right, the angle adjusting mechanism 3 drives the inner nacelle top suction disc mechanism 4 to move left and right, the inner nacelle top suction disc mechanism 4 drives the upper nacelle cover to move left and right, while the output end of the third cylinder 32 moves upward, the output end of the fourth cylinder 33 moves downward, thereby adjusting the left inclination angle of the angle adjusting plate 35, adjusting the left inclination angle of the first inclination assembly 25, adjusting the left inclination angle of the inner nacelle top suction disc mechanism 4, and finally driving the left inclination angle of the upper nacelle cover. While the output end of the third cylinder 32 moves downward, the output end of the fourth cylinder 33 moves upward, the right inclination angle of the upper nacelle cover can be adjusted. While the output end of the first cylinder 29 moves downward, the output end of the second cylinder 30 moves upward, the rear inclination angle of the inner nacelle top suction disc mechanism 4 can be adjusted, thereby adjusting the rear inclination angle of the upper nacelle cover. While the output end of the first cylinder 29 moves upward, the output end of the second cylinder 30 moves downward, the front inclination angle of the inner nacelle top suction disc mechanism 4 can be adjusted.Thus, the forward inclination angle of the cabin upper cover is adjusted, the angles of the cabin upper cover and the cabin lower cover are adjusted and aligned, and installation is performed, which is the overall working process of the present application, and the steps can be repeated next time.

[0046] The foregoing description of the disclosed embodiments enables a person skilled in the art to carry out or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A nacelle cover angle fixing device comprising a support leg (6) provided with a square frame (1) on the support leg (6), characterized in that: The square frame (1) is provided with a translation mechanism (2), the translation mechanism (2) is provided with an angle adjusting mechanism (3), and the angle adjusting mechanism (3) is provided with an inner cabin top suction disc mechanism (4); the translation mechanism (2) comprises a longitudinal translation assembly (7) and a transverse translation assembly (8), the longitudinal translation assembly (7) is arranged on the square frame (1), the transverse translation assembly (8) is arranged on the longitudinal translation assembly (7), and the transverse translation assembly (8) comprises a second moving block (24); the angle adjusting mechanism (3) comprises a first inclination assembly (25) and a third inclination assembly (27), the third inclination assembly (27) is arranged on the second moving block (24), and the first inclination assembly (25) is arranged on the third inclination assembly (27); the third inclination assembly (27) comprises a second fixed column (34), the second fixed column (34) is arranged on the second moving block (24), the upper end of the second fixed column (34) is hinged with an angle adjusting plate (35), one side of the upper end of the second moving block (24) is hinged with a cylinder seat of a third air cylinder (32), the output end of the third air cylinder (32) is hinged with one side of the lower end of the angle adjusting plate (35), the other side of the upper end of the second moving block (24) is hinged with a cylinder seat of a fourth air cylinder (33), and the output end of the fourth air cylinder (33) is hinged with the other side of the lower end of the angle adjusting plate (35); the first inclination assembly (25) comprises a first fixed column (28), the first fixed column (28) is arranged on the angle adjusting plate (35), the upper end of the first fixed column (28) is hinged with a supporting cavity (31), one side of the upper end of the angle adjusting plate (35) is hinged with a cylinder seat of a first air cylinder (29), the output end of the first air cylinder (29) is hinged with one side of the lower end of the supporting cavity (31), the other side of the upper end of the angle adjusting plate (35) is hinged with a cylinder seat of a second air cylinder (30), and the output end of the second air cylinder (30) is hinged with the other side of the lower end of the supporting cavity (31); the inner cabin top suction disc mechanism (4) comprises a suction assembly (45) and a fixing assembly (46), the suction assembly (45) is arranged in the supporting cavity (31), and the fixing assembly (46) is arranged in the supporting cavity (31); the suction assembly (45) comprises a magnetorheological fluid cavity (36), the magnetorheological fluid cavity (36) is arranged at the inner top end of the supporting cavity (31), the inner bottom end of the magnetorheological fluid cavity (36) is provided with a spring (38), the upper end of the spring (38) is provided with a second sliding block (37), the second sliding block (37) is slidably arranged in the magnetorheological fluid cavity (36), the second sliding block (37) is provided with a solution flow hole (39), the upper end of the second sliding block (37) is provided with a buffer rod (41), and the upper end of the buffer rod (41) is provided with an electric suction disc (42).The fixed assembly (46) comprises a controller (43) arranged at the inner bottom end of the supporting cavity (31), an electromagnetic coil (40) wound around the outer side wall of the magnetorheological fluid cavity (36), the electromagnetic coil (40) being connected to the controller (43), the controller (43) being connected to an external power supply, and the magnetorheological fluid cavity (36) being filled with magnetorheological fluid.

2. A nacelle cover angle fixation device according to claim 1, characterized in that: The longitudinal translation component (7) comprises a first motor (9) arranged on one side of the inner wall of the square frame (1), one end of the output of the first motor (9) is provided with a driving pipe (10), the other end of the driving pipe (10) is rotatably arranged on the other inner wall of the square frame (1), a bevel gear one (11) is sleeved on the driving pipe (10), a slide rod (14) is arranged on the outer wall of the square frame (1), a first lead screw (13) is rotatably arranged on the outer wall of the square frame (1), one end of the first lead screw (13) is provided with a bevel gear two (12), the bevel gear one (11) and the bevel gear two (12) are rotatably connected in meshing, the first moving block (15) is slidably sleeved on the slide rod (14), the first moving block (15) is sleeved on the first lead screw (13), and the first lead screw (13) and the first moving block (15) are threadedly connected.

3. A nacelle cover angle fixation device according to claim 2, characterized in that: The transverse translation component (8) comprises a lifting cylinder (16), the lifting cylinder (16) is arranged on the first moving block (15), the output of the lifting cylinder (16) is provided with a lifting plate (17), the lifting plate (17) is provided with a first long slot (18), the first long slot (18) is provided with a sliding groove (19), the first sliding block (23) is slidably arranged in the sliding groove (19), the upper end of the first sliding block (23) is provided with a supporting rod (44), the upper end of the supporting rod (44) is provided with a second moving block (24), the lower end of the second moving block (24) is provided with a sleeve pipe (22), one end of the outer portion of the lifting plate (17) is provided with a second motor (20), the output of the second motor (20) is provided with a second lead screw (21), the other end of the second lead screw (21) is rotatably arranged on the inner side wall of the first long slot (18), the sleeve pipe (22) is sleeved on the second lead screw (21), and the second lead screw (21) and the sleeve pipe (22) are threadedly connected.

4. A nacelle cover angle securing device according to claim 3, characterized in that: The upper end of the supporting cavity (31) is provided with a sealing ring (47), and the sealing ring (47) is slidably sleeved on the buffer rod (41).

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