Offshore wind power tower with good stability and installation method

Abstract

The application relates to the technical field of wind power tower drums, and discloses a marine wind power tower drum with good stability, which comprises a drum body, a connecting groove is arranged at the top of the drum body, a positioning groove is arranged in the inner circumferential surface of the connecting groove, a fixing groove is arranged in the inner circumferential surface of the connecting groove, a clamping groove is arranged at the bottom of the connecting groove, a connecting head is integrally arranged at the bottom of the drum body and is inserted into the connecting groove, and the outer circumferential surface of the connecting head is integrally provided with a positioning protrusion. The marine wind power tower drum with good stability and the installation method are characterized in that the plug-in head is inserted into the connecting groove, the butt joint between the two drum bodies is very simple, the clamping plate in the plug-in assembly is fixed with the clamping hook in the clamping assembly, the connection between the two drum bodies is very firm after installation, the drum body has the advantages of high stability, convenient positioning and simple installation.

Description

Technical Field

[0001] This invention relates to the field of wind turbine tower technology, specifically to a stable offshore wind turbine tower and its installation method. Background Technology

[0002] With the increasing demands of people's lives, electricity has become a major energy source. Wind power generation is characterized by its high environmental friendliness. As a result, most wind turbine towers are installed on land to assemble the turbine rotors. With the expansion of the region, the installation location is connected to the offshore tower base through the installation flange, and then installed at sea to generate electricity through the sea breeze effect.

[0003] In existing technologies, wind turbine towers are assembled by connecting them in pairs. Most of these connections use multiple fixed components for positioning, which is not only cumbersome but also lacks stability.

[0004] Therefore, we propose a stable offshore wind turbine tower and its installation method. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, the present invention provides the following technical solution: a stable offshore wind turbine tower, comprising a tower body, a connecting groove at the top of the tower body, a positioning groove on the inner circumferential surface of the connecting groove, a fixing groove on the inner circumferential surface of the connecting groove, a snap-fit ​​groove at the bottom of the connecting groove, a connector integrally provided at the bottom of the tower body for inserting into the connecting groove, a positioning protrusion integrally provided on the outer circumferential surface of the connector, a snap-fit ​​component for snapping into the snap-fit ​​groove inside the connector, and an insertion component inside the tower body, the insertion component being adapted to and inserted into the fixing groove.

[0006] Preferably, the plug-in assembly includes a fixing block fixedly installed to the inner wall of the cylinder, and a disc fixedly connected to the fixing block via a fixing crossbar. One end of the fixing crossbar is integrally connected to the fixing block, and the other end of the fixing crossbar is integrally connected to the top of the outer circumference of the disc. The disc is coaxially arranged with the cylinder. A rotating shaft is rotatably connected to the middle of the disc. The top of the rotating shaft passes through the top of the disc. A handwheel is fixedly connected to the top of the rotating shaft. A ratchet located inside the disc is fixedly installed in the middle of the rotating shaft. A pawl adapted to the ratchet is rotatably connected inside the disc. A spring is fixedly installed between the pawl and the inner side wall of the disc.

[0007] Preferably, the disc and the fixed block are slidably connected by a snap-fit ​​plate, the snap-fit ​​plate passing through the disc and the fixed block, the rotating shaft is fixedly installed with a turntable located below the ratchet, the turntable has a movable groove, the movable groove passing through the top and bottom of the turntable, and a sliding cylinder is integrally connected to one end of the upper surface of the snap-fit ​​plate, the sliding cylinder being slidably connected to the movable groove.

[0008] Preferably, the connector has a fixing groove that extends through both the inner and outer sides of the connector. The fixing groove in the connector corresponds to the fixing groove inside the connector groove. The snap-fit ​​plate passes through the connector and the snap-fit ​​assembly via the fixing groove.

[0009] Preferably, the snap-fit ​​assembly includes a displacement groove formed inside the connector and a displacement block located inside the displacement groove. The displacement block is slidably connected to the displacement groove. A limiting rod is fixedly installed inside the displacement groove. The limiting rod is slidably connected through the middle of the displacement block. A snap-fit ​​hook is integrally provided at the bottom of the displacement block. A through groove is formed in the middle of the displacement block. The through groove is flush with the fixing groove formed in the connector. The snap-fit ​​plate passes through the through groove. A return spring is fixedly installed on one side of the displacement block. The other end of the return spring is fixedly installed to the side wall of the displacement groove.

[0010] Preferably, the end of the snap-fit ​​plate away from the disk is provided with an inclined surface, and the inclined surface of the snap-fit ​​plate contacts one side of the through groove on the displacement block.

[0011] Preferably, the fixed crossbar is arranged parallel to the snap-fit ​​plate, the snap-fit ​​plate is located directly below the fixed crossbar, and the center lines of the fixed crossbar and the snap-fit ​​plate are located in the same vertical plane.

[0012] Preferably, the diameter of the turntable is not greater than the inner diameter of the disc, and the width of the movable groove is the same as the diameter of the sliding cylinder.

[0013] Preferably, the fixing groove of the connecting groove does not extend to the outside of the cylinder body, the number of the snap-fit ​​components and the plug-in components are the same, and the snap-fit ​​components and the plug-in components are evenly arranged inside the cylinder body in a one-to-one correspondence.

[0014] A method for installing a stable offshore wind turbine tower, comprising the following steps:

[0015] S1: Lift the cylinder body, align the plug at the bottom of the cylinder body with the connecting groove at the top of the cylinder body that has been fixed at the bottom, and align the positioning protrusion with the positioning groove. Then, insert the connecting groove and the connector.

[0016] S2: Turn the handwheel to drive the ratchet and turntable to rotate, and the ratchet pawl will make the turntable rotate intelligently in one direction;

[0017] S3: As the turntable rotates, the sliding cylinder moves along the movable groove, causing the snap-fit ​​plate to extend outward;

[0018] S4: As the snap-fit ​​plate extends outward, the inclined surface at the outer end of the snap-fit ​​plate pushes the displacement block to slide in the displacement groove, and drives the snap-fit ​​hook that has been inserted into the snap-fit ​​groove to rotate, thereby making the snap-fit ​​hook snap-fit ​​with the snap-fit ​​groove.

[0019] S5: As the handwheel rotates continuously, the snap-fit ​​plate inserts into the fixed groove of the connector head and the through groove on the moving block and the fixed groove inside the connecting groove, so that the upper and lower cylinders are fixed, while the pawl and ratchet can prevent the turntable from reversing and pull out the snap-fit ​​plate.

[0020] Beneficial effects

[0021] Compared with the prior art, the present invention provides a stable offshore wind turbine tower and its installation method, which has the following advantages:

[0022] 1. This stable offshore wind turbine tower and its installation method align the plug at the bottom of the tower body with the connecting groove at the top of the tower body, which is already fixed at the bottom, and align the positioning protrusion with the positioning groove. Then, the connecting groove and the connector are plugged in, making the connection between the two tower bodies very simple. At the same time, the two tower bodies are fixed by the snap-fit ​​plate and snap-fit ​​hook in the snap-fit ​​assembly. After installation, the connection between the two tower bodies is very firm, which not only has high stability, but also has the advantages of convenient positioning and simple installation.

[0023] 2. This stable offshore wind turbine tower and its installation method involve rotating a handwheel to drive a ratchet and a turntable to rotate. As the turntable rotates, the sliding cylinder moves along the movable groove and causes the snap-fit ​​plate to extend outward. The snap-fit ​​plate is inserted into the fixed groove in the connector and the through groove on the movable block, and into the fixed groove inside the connecting groove, thus fixing the upper and lower tower bodies. The pawl and ratchet prevent the turntable from reversing and pulling out the snap-fit ​​plate.

[0024] 3. This stable offshore wind turbine tower and its installation method involve moving the snap-fit ​​plate to push the displacement block to slide in the displacement groove, thereby causing the snap-fit ​​hook that has been inserted into the snap-fit ​​groove to rotate, so that the snap-fit ​​hook engages with the snap-fit ​​groove, making the connection between the two tower bodies more secure. At the same time, the snap-fit ​​plate penetrates the displacement block to prevent the displacement block from shrinking and moving the snap-fit ​​hook out of the snap-fit ​​groove. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the top of the cylinder body of the present invention;

[0027] Figure 3 This is a schematic diagram of the bottom structure of the cylinder body of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the plug-in assembly of the present invention;

[0029] Figure 5 This is a schematic diagram of the internal structure of the disk of the present invention. Figure 1 ;

[0030] Figure 6 This is a schematic diagram of the internal structure of the disk of the present invention. Figure 2 ;

[0031] Figure 7 This is a schematic diagram of the structure of the turntable and snap-fit ​​plate of the present invention;

[0032] Figure 8 This is a schematic diagram of the snap-fit ​​assembly of the present invention.

[0033] In the diagram: 1. Cylinder body; 2. Connecting groove; 3. Positioning groove; 4. Fixing groove; 5. Connector; 6. Positioning protrusion; 7. Insertion assembly; 71. Fixing block; 72. Fixing crossbar; 73. Disc; 74. Rotating shaft; 75. Handwheel; 76. Ratchet; 77. Pad; 78. Spring; 79. Turntable; 710. Movable groove; 711. Snap-fit ​​plate; 712. Sliding cylinder; 8. Snap-fit ​​assembly; 81. Displacement groove; 82. Displacement block; 83. Limiting rod; 84. Return spring; 85. Through groove; 86. Snap-fit ​​hook; 9. Snap-fit ​​groove. Detailed Implementation

[0034] 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.

[0035] Please see Figures 1 to 8A stable offshore wind turbine tower includes a tower body 1. The top of the tower body 1 has a connecting groove 2, the inner circumferential surface of the connecting groove 2 has a positioning groove 3, the inner circumferential surface of the connecting groove 2 has a fixing groove 4, and the bottom of the connecting groove 2 has a snap-fit ​​groove 9. The bottom of the tower body 1 is integrally provided with a connector 5 that plugs into the connecting groove 2. The outer circumferential surface of the connector 5 is integrally provided with a positioning protrusion 6. The inside of the connector 5 is provided with a snap-fit ​​component 8 that snaps into the snap-fit ​​groove 9. The inside of the tower body 1 is provided with a plug-in component 7, which is connected to the fixing groove 9. The slot 4 is adapted for plug-in connection. By aligning the plug at the bottom of the cylinder 1 with the connecting slot 2 at the top of the cylinder 1 which is fixed at the bottom, and aligning the positioning protrusion 6 with the positioning slot 3, the connecting slot 2 and the connector 5 are plugged in, making the connection between the two cylinders 1 very simple. At the same time, the snap-fit ​​plate 711 in the plug-in assembly 7 and the snap-fit ​​hook 86 in the snap-fit ​​assembly 8 are fixed. After installation, the connection between the two cylinders 1 is very firm, with high stability, and also has the advantages of convenient positioning and simple installation.

[0036] In one embodiment of the present invention, the plug-in assembly 7 includes a fixing block 71 fixedly installed to the inner wall of the cylinder 1, and a disc 73 fixedly connected to the fixing block 71 via a fixing crossbar 72. One end of the fixing crossbar 72 is integrally connected to the fixing block 71, and the other end of the fixing crossbar 72 is integrally connected to the top of the outer peripheral surface of the disc 73. The disc 73 is coaxially arranged with the cylinder 1. A rotating shaft 74 is rotatably connected to the middle of the disc 73. The top of the rotating shaft 74 passes through the top of the disc 73. A handwheel 75 is fixedly connected to the top of the rotating shaft 74. A ratchet 76 located inside the disc 73 is fixedly installed in the middle of the rotating shaft 74. A pawl 77 adapted to the ratchet 76 is rotatably connected inside the disc 73. A spring piece 78 is fixedly installed between the pawl 77 and the side wall inside the disc 73.

[0037] In one embodiment of the present invention, a snap-fit ​​plate 711 is slidably connected to the disc 73 and the fixed block 71, the snap-fit ​​plate 711 passing through the disc 73 and the fixed block 71. A turntable 79 located below the ratchet 76 is fixedly mounted on the rotating shaft 74. The turntable 79 has a movable groove 710 that passes through the top and bottom of the turntable 79. A sliding cylinder 712 is integrally connected to one end of the upper surface of the snap-fit ​​plate 711, and the sliding cylinder 712 is slidably connected to the movable groove 710. By turning the handwheel 75, the ratchet 76 and the turntable 79 are driven to rotate. As the turntable 79 rotates, the sliding cylinder 712 moves along the movable groove 710 and drives the snap-fit ​​plate 711 to extend outward. The snap-fit ​​plate 711 passes through the fixed groove 4 opened in the connector 5 and the through groove 85 on the moving block and is inserted into the fixed groove 4 inside the connecting groove 2, so that the upper and lower cylinders 1 are fixed. The pawl 77 and the ratchet 76 can prevent the turntable 79 from reversing and pull out the snap-fit ​​plate 711.

[0038] In one embodiment of the present invention, the connector 5 is provided with a fixing groove 4, which extends through the inner and outer sides of the connector 5. The fixing groove 4 in the connector 5 corresponds to the fixing groove 4 inside the connector groove 2. The snap-fit ​​plate 711 passes through the connector 5 and the snap-fit ​​assembly 8 through the fixing groove 4.

[0039] In one embodiment of the present invention, the snap-fit ​​assembly 8 includes a displacement groove 81 formed inside the connector 5, and a displacement block 82 located inside the displacement groove 81. The displacement block 82 is slidably connected to the displacement groove 81. A limiting rod 83 is fixedly installed inside the displacement groove 81. The limiting rod 83 is slidably connected to the middle of the displacement block 82. A snap-fit ​​hook 86 is integrally provided at the bottom of the displacement block 82. A through groove 85 is formed in the middle of the displacement block 82. The through groove 85 is flush with the fixing groove 4 formed in the connector 5. The snap-fit ​​plate 711 passes through... A return spring 84 is fixedly installed on one side of the displacement block 82 through the through groove 85. The other end of the return spring 84 is fixedly installed on the side wall of the displacement groove 81. The movement of the snap-fit ​​plate 711 pushes the displacement block 82 to slide in the displacement groove 81, and drives the snap-fit ​​hook 86, which has been inserted into the snap-fit ​​groove 9, to rotate, thereby making the snap-fit ​​hook 86 snap-fit ​​with the snap-fit ​​groove 9, making the connection between the two cylinder bodies 1 more secure. At the same time, the snap-fit ​​plate 711 penetrates the displacement block 82 to prevent the displacement block 82 from retracting and moving the snap-fit ​​hook 86 out of the snap-fit ​​groove 9.

[0040] In one embodiment of the present invention, the end of the snap-fit ​​plate 711 away from the disk 73 is provided with an inclined surface, and the inclined surface of the snap-fit ​​plate 711 contacts one side of the through groove 85 on the displacement block 82.

[0041] In one embodiment of the present invention, the fixed crossbar 72 and the snap-fit ​​plate 711 are arranged in parallel, with the snap-fit ​​plate 711 located directly below the fixed crossbar 72, and the center lines of the fixed crossbar 72 and the snap-fit ​​plate 711 located in the same vertical plane.

[0042] In one embodiment of the present invention, the diameter of the turntable 79 is not greater than the inner diameter of the disk 73, and the width of the movable groove 710 is the same as the diameter of the sliding cylinder 712.

[0043] In one embodiment of the present invention, the fixing groove 4 of the connecting groove 2 does not extend to the outside of the cylinder body 1, the number of snap-fit ​​components 8 and plug-in components 7 are the same, and the snap-fit ​​components 8 and plug-in components 7 are evenly arranged inside the cylinder body 1 in a one-to-one correspondence.

[0044] A method for installing a stable offshore wind turbine tower, comprising the following steps:

[0045] S1: Lift the cylinder body 1, align the plug at the bottom of the cylinder body 1 with the connecting groove 2 at the top of the cylinder body 1 which is fixed at the bottom, align the positioning protrusion 6 with the positioning groove 3, and plug the connecting groove 2 with the connector 5.

[0046] S2: Turn the handwheel 75 to drive the ratchet 76 and the turntable 79 to rotate, and the pawl 77 will make the turntable 79 rotate intelligently in one direction;

[0047] S3: As the turntable 79 rotates, the sliding cylinder 712 moves along the movable groove 710, and drives the snap-fit ​​plate 711 to extend outward;

[0048] S4: During the process of the snap-fit ​​plate 711 extending outward, the inclined surface at the outer end of the snap-fit ​​plate 711 pushes the displacement block 82 to slide in the displacement groove 81, and drives the snap-fit ​​hook 86 that has been inserted into the snap-fit ​​groove 9 to rotate, thereby making the snap-fit ​​hook 86 snap-fit ​​with the snap-fit ​​groove 9.

[0049] S5: As the handwheel 75 rotates continuously, the locking plate 711 passes through the fixing groove 4 opened in the connector 5 and the through groove 85 on the moving block and the fixing groove 4 inside the connecting groove 2, so that the upper and lower cylinders 1 are fixed, while the pawl 77 and ratchet 76 can prevent the turntable 79 from reversing and pull out the locking plate 711.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stable offshore wind turbine tower, comprising a tower body (1), characterized in that: The top of the cylinder (1) is provided with a connecting groove (2), the inner circumferential surface of the connecting groove (2) is provided with a positioning groove (3), the inner circumferential surface of the connecting groove (2) is provided with a fixing groove (4), the bottom of the connecting groove (2) is provided with a snap-fit ​​groove (9), the bottom of the cylinder (1) is integrally provided with a connector (5) that is inserted into the connecting groove (2) of the adjacent cylinder (1) below, the outer circumferential surface of the connector (5) is integrally provided with a positioning protrusion (6) that is adapted to the positioning groove (3), the inside of the connector (5) is provided with a snap-fit ​​component (8) that is snap-fitted into the snap-fit ​​groove (9) of the adjacent cylinder (1) below, the inside of the cylinder (1) is provided with a plug-in component (7), and the plug-in component (7) is adapted to be plugged into the fixing groove (4); The insertion assembly (7) includes a fixing block (71) fixedly installed to the inner wall of the cylinder (1), and a disc (73) fixedly connected to the fixing block (71) by a fixing crossbar (72). One end of the fixing crossbar (72) is integrally connected to the fixing block (71), and the other end of the fixing crossbar (72) is integrally connected to the top of the outer circumference of the disc (73). The disc (73) is coaxially arranged with the cylinder (1), and the middle part of the disc (73) rotates. A rotating shaft (74) is connected, the top of which passes through the top of the disc (73). A handwheel (75) is fixedly connected to the top of the rotating shaft (74). A ratchet (76) located inside the disc (73) is fixedly installed in the middle of the rotating shaft (74). A pawl (77) adapted to the ratchet (76) is rotatably connected inside the disc (73). A spring piece (78) is fixedly installed between the pawl (77) and the side wall inside the disc (73).

2. The offshore wind turbine tower with good stability according to claim 1, characterized in that: The disc (73) and the fixed block (71) are slidably connected by a snap-fit ​​plate (711), the snap-fit ​​plate (711) passes through the disc (73) and the fixed block (71), the rotating shaft (74) is fixedly installed with a turntable (79) located below the ratchet (76), the turntable (79) is provided with a movable groove (710), the movable groove (710) passes through the top and bottom of the turntable (79), one end of the upper surface of the snap-fit ​​plate (711) is integrally connected with a sliding cylinder (712), the sliding cylinder (712) is slidably connected to the movable groove (710).

3. The offshore wind turbine tower with good stability according to claim 2, characterized in that: The connector (5) has a through fixing hole. The through fixing hole of the connector (5) passes through the inner and outer sides of the connector (5). The through fixing hole of the connector (5) corresponds to the fixing groove (4) inside the connecting groove (2). The snap-fit ​​plate (711) passes through the connector (5) and the snap-fit ​​assembly (8) through the fixing groove (4) and the through fixing hole.

4. The offshore wind turbine tower with good stability according to claim 3, characterized in that: The snap-fit ​​assembly (8) includes a displacement groove (81) inside the connector (5) and a displacement block (82) inside the displacement groove (81). The displacement block (82) is slidably connected to the displacement groove (81). A limiting rod (83) is fixedly installed inside the displacement groove (81). The limiting rod (83) is slidably connected to the middle of the displacement block (82). A snap-fit ​​hook (86) is integrally provided at the bottom of the displacement block (82). A through groove (85) is provided in the middle of the displacement block (82). The through groove (85) is flush with the fixing groove (4) opened in the connector (5). The snap-fit ​​plate (711) passes through the through groove (85). A return spring (84) is fixedly installed on one side of the displacement block (82). The other end of the return spring (84) is fixedly installed on the side wall of the displacement groove (81).

5. The offshore wind turbine tower with good stability according to claim 4, characterized in that: The snap-fit ​​plate (711) has an inclined surface at one end away from the disk (73), and the inclined surface of the snap-fit ​​plate (711) contacts one side of the through groove (85) on the displacement block (82).

6. The offshore wind turbine tower with good stability according to claim 5, characterized in that: The fixed crossbar (72) is arranged parallel to the snap-fit ​​plate (711), the snap-fit ​​plate (711) is located directly below the fixed crossbar (72), and the center lines of the fixed crossbar (72) and the snap-fit ​​plate (711) are located in the same vertical plane.

7. The offshore wind turbine tower with good stability according to claim 6, characterized in that: The diameter of the turntable (79) is not greater than the inner diameter of the disc (73), and the width of the movable groove (710) is the same as the diameter of the sliding cylinder (712).

8. The offshore wind turbine tower with good stability according to claim 7, characterized in that: The fixing groove (4) of the connecting groove (2) does not extend to the outside of the cylinder body (1). The number of the snap-fit ​​component (8) and the plug-in component (7) are the same. The snap-fit ​​component (8) and the plug-in component (7) are evenly arranged inside the cylinder body (1) in a one-to-one correspondence.

9. A method for installing a stable offshore wind turbine tower, characterized in that, The installation of a stable offshore wind turbine tower as described in claim 8 includes the following steps: S1: Lift the cylinder (1) and align the plug at the bottom of the cylinder (1) with the connecting groove (2) at the top of the cylinder (1) which is fixed at the bottom. At the same time, align the positioning protrusion (6) with the positioning groove (3) and plug the connecting groove (2) with the connector (5). S2: Turn the handwheel (75) to drive the ratchet (76) and the turntable (79) to rotate, and make the turntable (79) rotate intelligently in one direction through the pawl (77); S3: As the turntable (79) rotates, the sliding cylinder (712) moves along the movable groove (710) and drives the snap plate (711) to extend outward; S4: During the process of the snap-fit ​​plate (711) extending outward, the inclined surface at the outer end of the snap-fit ​​plate (711) pushes the displacement block (82) to slide in the displacement groove (81), and drives the snap-fit ​​hook (86) that has been inserted into the snap-fit ​​groove (9) to rotate, thereby making the snap-fit ​​hook (86) snap-fit ​​with the snap-fit ​​groove (9). S5: As the handwheel (75) rotates continuously, the snap-fit ​​plate (711) is inserted into the fixed groove (4) opened through the connector (5), the through groove (85) on the moving block, and the fixed groove (4) inside the connecting groove (2), so that the upper and lower cylinders (1) are fixed, while the pawl (77) and ratchet (76) can prevent the turntable (79) from reversing and pull out the snap-fit ​​plate (711).

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