Reinforced wind power tower drum

Abstract

The utility model provides a reinforced wind power tower drum which comprises a tower drum body and a tower drum reinforcing assembly, and the tower drum reinforcing assembly comprises a middle upper portion reinforcing sleeve, a bottom reinforcing sleeve, a reinforcing ring and at least two prestress inhaul cables which are arranged in the circumferential direction of the tower drum body at intervals. The middle upper part reinforcing sleeve and the bottom reinforcing sleeve are tightly sleeved on the tower drum body, and the middle upper part reinforcing sleeve is positioned above the bottom reinforcing sleeve; the reinforcing ring is tightly sleeved on the middle upper reinforcing sleeve; the prestress inhaul cable is connected between the reinforcing ring and the bottom reinforcing sleeve in a stretched mode. The tower drum has the advantages that buckling damage of the tower drum body is avoided, the bearing capacity of the tower drum is guaranteed, and the like.

Description

Technical Field

[0001] The utility model relates to the field of wind power tower reinforcement, in particular to a reinforced wind power tower. Background Art

[0002] In recent years, with the development of wind power projects, the demand for wind turbine power generation efficiency has also increased, which means that the width, height and weight of the unit have increased accordingly. The wind turbine tower mainly supports and absorbs the vibration of the unit in the wind turbine generator set, and is also the weak point of unit damage. In order to extend the overall service life of the wind turbine, the requirements for the tower's bearing capacity are constantly increasing.

[0003] In order to solve the above problems, the existing tower reinforcement method is to use flexible or rigid reinforcement. The existing reinforcement method takes targeted measures for different stress conditions at the tower position, resulting in poor tower bearing capacity and short service life. At the same time, after the tower is reinforced, the tower force may change and new weak points may be generated. The existing reinforcement method cannot maximize the tower bearing capacity. For example, the connecting cable part of the tower will be subjected to greater lateral tensile stress, and the new weak points generated will lead to poor tower reinforcement effect. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a reinforced wind power tower which can avoid the buckling damage of the tower body and ensure the bearing capacity of the tower.

[0005] In order to solve the above technical problems, the technical solution proposed by the utility model is:

[0006] A reinforced wind power tower comprises a tower body and a tower reinforcement assembly, wherein the tower reinforcement assembly comprises a middle and upper reinforcement sleeve, a bottom reinforcement sleeve, a reinforcement ring and at least two prestressed cables arranged at intervals along the circumference of the tower body, the middle and upper reinforcement sleeve and the bottom reinforcement sleeve are both tightly sleeved on the tower body, and the middle and upper reinforcement sleeve is located above the bottom reinforcement sleeve; the reinforcement ring is tightly sleeved on the middle and upper reinforcement sleeve; the prestressed cable is connected between the reinforcement ring and the bottom reinforcement sleeve in a stretched state.

[0007] As a further improvement of the above technical solution:

[0008] The bottom reinforcement sleeve includes a bottom sleeve and a bottom tray that are interconnected, the prestressed cable is connected to the bottom tray through a tensioning anchor, and the tensioning anchor includes a limit mounting piece, an anchor ring, a prestressed clip, an elastic anchor plate and an adjusting spring, wherein the limit mounting piece is installed on the bottom tray, the prestressed cable is tightened and limited to the limit mounting piece by the prestressed clip and the anchor ring; the elastic anchor plate is arranged between the anchor ring and the limit mounting piece, and the adjusting spring is arranged between the elastic anchor plate and the limit mounting piece.

[0009] The limiting mounting component includes a mounting base connected to the bottom tray, a mounting frame arranged on the mounting base, and a limiting block arranged on the upper frame position of the mounting frame, wherein a receiving cavity is formed in the middle of the mounting frame; the bottom end of the prestressed cable passes through the limiting block and is placed in the receiving cavity; the anchor ring clamps the bottom end of the prestressed cable through the prestressed clip and cooperates with the limiting block.

[0010] The limit block is provided with an elastic member mounting groove, and the elastic anchor plate includes a step limit section, a tapered transition section and a small-diameter mounting section connected in sequence, and the step limit section is located at the end of the limit block at the lower limit of the force of the anchor ring; the small-diameter mounting section and the tapered transition section are located in the elastic member mounting groove, and the adjusting spring is sleeved on the small-diameter mounting section.

[0011] The limit block is provided with a tapered portion for increasing the tensile and compressive bearing capacity of the prestressed cable tensioning position.

[0012] The bottom sleeve includes two semi-annular sleeves and an adjustment assembly arranged between the two semi-annular sleeves, the adjustment assembly includes a plurality of bolt adjustment components arranged at intervals along the axial direction of the adjustment sleeve, the bolt adjustment component includes an adjustment bolt, two adjustment nuts and two limiting protrusions, the two limiting protrusions are respectively arranged on the corresponding semi-annular sleeves, the adjustment bolt passes through the two limiting protrusions, the two adjusting nuts are screwed to the two ends of the adjustment bolt and cooperate with the limiting protrusions.

[0013] The bottom sleeve includes a plurality of tower sections arranged axially along the tower body, and the tower section located at the bottom end is provided with a door opening through hole corresponding to the door opening of the tower body.

[0014] The middle and upper reinforcement sleeve includes an adjustment sleeve with an opening, and an adjustment binding wire that ensures the adjustment sleeve fits the tower body. The outer surface of the adjustment sleeve along the axial direction is provided with limiting ring gaps with the same number as the adjusting binding wires, and the adjusting binding wires are arranged in the corresponding limiting ring gaps.

[0015] A plurality of reinforcing ribs are provided on the inner side of the reinforcing ring, and the plurality of reinforcing ribs are arranged along the circumference of the tower body. Both ends of adjacent reinforcing ribs are connected to each other and are respectively installed on the reinforcing ring and the tower body.

[0016] The prestressed cable is hinged to the reinforcement ring through a hinge block.

[0017] Compared with the prior art, the advantages of the utility model are:

[0018] The utility model can set a combination of rigid reinforcement and flexible reinforcement according to the stress conditions at different positions of the tower body. Specifically, the utility model sets a bottom reinforcement sleeve at the bottom of the tower body where the stress bending moment is the largest, so as to increase the bearing capacity of the tower bottom by a rigid reinforcement method that increases the cross section of the component. Prestressed cables are arranged in the middle and upper part of the tower body where the force is complex and the deflection changes greatly, so as to control the deflection change of the middle and upper part of the tower and reduce the buckling damage of the middle and upper part of the tower body by means of flexible reinforcement. At the same time, when the prestressed cables are arranged and a weak point is generated in the middle and upper part of the tower, a middle and upper reinforcement sleeve is arranged in the middle and upper area of ​​the tower body, and a reinforcement ring is arranged outside the middle and upper reinforcement sleeve, and the reinforcement ring is connected to the prestressed cables. The arrangement of the middle and upper reinforcement sleeve effectively improves the bearing capacity of the middle and upper part of the tower. The arrangement of the reinforcement ring effectively disperses the force of the prestressed cables on the tower body to the middle area of ​​the tower body, which effectively avoids the problem of excessive lateral tensile stress caused by direct contact between the prestressed cables and the tower body. That is, the middle and upper part of the tower body adopts a reinforcement method combining rigid reinforcement and flexible reinforcement, which ensures the bearing capacity of the tower while avoiding buckling damage in the middle and upper part of the tower body, and effectively improves the service life of the wind turbine tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0020] Figure 1 It is a structural schematic diagram of the utility model for reinforcing a wind power tower.

[0021] Figure 2 It is a schematic diagram of the matching relationship between the prestressed cable and the tension anchor of the utility model.

[0022] Figure 3 It is a cross-sectional view of the tension anchor of the utility model.

[0023] Figure 4 It is a schematic diagram of the matching relationship between the prestressed cable and the middle and upper reinforcement sleeve of the utility model.

[0024] Figure 5 It is a structural schematic diagram of the bottom reinforcement sleeve of the utility model.

[0025] The symbols in the figure represent:

[0026] 1. Tower body; 2. Tower reinforcement assembly; 21. Middle and upper reinforcement sleeve; 211. Adjustment sleeve; 212. Adjustment binding wire; 22. Reinforcement ring; 221. Reinforcement rib; 23. Bottom reinforcement sleeve; 231. Bottom sleeve; 2311. Semi-annular sleeve; 2312. Adjustment bolt; 2313. Adjustment nut; 2314. Limiting protrusion; 2315. Tower segment; 2316. Door opening through hole; 232. Bottom tray; 24. Prestressed cable; 3. Tensioning anchor; 31. Limiting mounting piece; 311. Mounting base; 312. Mounting frame; 313. Limiting block; 3131. Elastic member mounting groove; 3132. Conical portion; 314. Accommodating cavity; 32. Anchor ring; 33. Prestressed clip; 34. Elastic anchor pad; 341. Step limiting section; 342. Small diameter mounting section; 343. Conical transition section; 35. Adjusting spring; 4. Articulated block. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments of the specification, but the protection scope of the present invention is not limited thereby.

[0028] like Figures 1 to 5 As shown, the reinforced wind power tower of this embodiment includes a tower body 1 and a tower reinforcement assembly 2. In this embodiment, the tower reinforcement assembly 2 includes a middle and upper reinforcement sleeve 21, a bottom reinforcement sleeve 23, a reinforcement ring 22 and a prestressed cable 24. The middle and upper reinforcement sleeve 21 and the bottom reinforcement sleeve 23 are both tightly sleeved on the tower body 1, the bottom reinforcement sleeve 23 is arranged at the bottom end of the tower body 1, and the middle and upper reinforcement sleeve 21 is located above the bottom reinforcement sleeve 23 to improve the bearing capacity of the tower body 1; the reinforcement ring 22 is tightly sleeved on the middle and upper reinforcement sleeve 21; the prestressed cable 24 is connected between the reinforcement ring 22 and the bottom reinforcement sleeve 23 in a stretched state; there are at least two prestressed cables 24, and the prestressed cables 24 are arranged at intervals along the circumference of the tower body 1.

[0029] The utility model can set a reinforcement method combining rigid reinforcement and flexible reinforcement in a targeted manner according to the stress conditions at different positions of the tower body 1. Specifically: a bottom reinforcement sleeve 23 is set at the bottom of the tower body 1 where the stress bending moment is the largest, so as to increase the bearing capacity of the bottom of the tower by a rigid reinforcement method of increasing the cross-section of the component. A prestressed cable 24 is set in the middle and upper part of the tower body 1 where the stress is complex and the deflection change is large, so as to control the deflection change of the middle and upper part of the tower and reduce the buckling failure of the middle and upper part of the tower body 1 by a flexible reinforcement method; at the same time, when the prestressed cable 24 is set and a weak point is generated in the middle and upper part of the tower, a middle and upper reinforcement sleeve 21 is set in the middle and upper area of ​​the tower body 1, and a reinforcement ring 22 is set outside the middle and upper reinforcement sleeve 21, and the reinforcement ring 22 is connected to the prestressed cable 24. The setting of the middle and upper reinforcement sleeve 21 effectively improves The bearing capacity of the middle and upper part of the tower is improved. The setting of the reinforcement ring 22 effectively disperses the force of the prestressed cable 24 on the tower body 1 to the middle area of ​​the tower body 1, which effectively avoids the problem of excessive lateral tensile stress caused by direct contact between the prestressed cable 24 and the tower body 1. That is, the middle and upper part of the tower body 1 adopts a reinforcement method combining rigid reinforcement and flexible reinforcement, which ensures the bearing capacity of the tower while reducing the buckling damage of the middle and upper part of the tower body 1, effectively improving the service life of the wind turbine tower.

[0030] like Figure 2 and Figure 3 As shown, the bottom reinforcement sleeve 23 includes a bottom sleeve 231 and a bottom tray 232. The bottom tray 232 is connected to an external component (such as a foundation), and the bottom sleeve 231 is installed on the upper end surface of the bottom tray 232; the prestressed cable 24 is connected to the bottom tray 232 through the tension anchor 3.

[0031] In this embodiment, the tension anchor 3 includes a position-limiting mounting member 31, an anchor ring 32, a prestressed clip 33, an elastic anchor pad 34 and an adjusting spring 35. The position-limiting mounting member 31 is mounted on the bottom tray 232; the anchor ring 32 is sleeved on the bottom end of the prestressed cable 24; the prestressed clip 33 is arranged in the anchor ring 32 and clamps the prestressed cable 24. The prestressed cable 24 is tightened and limited to the position-limiting mounting member 31 by the prestressed clip 33 and the anchor ring 32, thereby realizing reliable position limiting of the prestressed cable 24, and the structure is compact and occupies little space.

[0032] At the same time, the elastic anchor plate 34 is arranged between the anchor ring 32 and the limiting mounting member 31, and the adjusting spring 35 is arranged between the elastic anchor plate 34 and the limiting mounting member 31. The arrangement of the elastic anchor plate 34 and the adjusting spring 35 increases the limiting distance between the anchor ring 32 and the limiting mounting member 31, so that the prestressed cable 24 has a stretching and contraction space, thereby providing a swinging space for the wind power tower. And the combination of the elastic anchor plate 34 and the adjusting spring 35 can effectively reduce vibration when the wind power tower is shaken and swung by different wind forces, that is, when the tower body 1 swings, the prestressed cable 24 transmits the force to the adjusting spring 35 and the elastic anchor plate 34, at this time, the adjusting spring 35 and the elastic anchor plate 34 produce elastic deformation, and the elastic force reacts to the prestressed cable 24, thereby controlling the swing of the tower body 1. When one of the elastic components of the adjustment spring 35 and the elastic anchor plate 34 reaches the maximum compression, the other elastic component can continuously provide elastic force, ensuring that the tower body 1 can still effectively alleviate vibration when it swings greatly, thereby improving the safety of wind power tower use.

[0033] Preferably, the position-limiting mounting member 31 includes a mounting base 311, a mounting frame 312 and a position-limiting block 313. The mounting base 311 is connected to the bottom tray 232 by bolts; after the mounting base 311 is installed, cement can be poured until it is flush with the upper surface of the mounting base 311, thereby further improving the bearing capacity of the wind power tower. At the same time, the mounting frame 312 is installed on the mounting base 311, and a receiving cavity 314 is formed in the middle of the mounting frame 312; the position-limiting block 313 is arranged at the upper frame position of the mounting frame 312; the bottom end of the prestressed cable 24 passes through the position-limiting block 313 and is placed in the receiving cavity 314; the anchor ring 32 is located in the receiving cavity 314, and the anchor ring 32 clamps the bottom end of the prestressed cable 24 through the prestressed clip 33, and the anchor ring 32 cooperates with the position-limiting block 313 under the action of the prestressed cable 24.

[0034] The setting of the accommodating chamber 314 of the utility model provides a reserved placement space for the jack to tension the prestressed cable 24, and the tail end of the prestressed cable 24 is located in the accommodating chamber 314, and the prestressed cable 24 is tightened and limited by the tensioning anchor 3 in the accommodating chamber 314. The ingenious setting of the installation frame 312 and the limiting block 313 ensures that the prestressed cable 24 is reliably tightened, and the installation is convenient and occupies a small space. At the same time, the limiting installation part 31 is divided and set according to the functions of installing and fixing the bottom reinforcement sleeve 23 and tightening and limiting the prestressed cable 24, which is convenient for the use and maintenance of each functional component.

[0035] In other embodiments, the limit mounting member 31 may also adopt a structure that can ensure that the prestressed cable 24 is effectively tightened and limited and the tower body 1 is reliably installed, such as direct tensioning by a jack or tensioning by a drum, but conventional structures cannot achieve the above advantages of this embodiment.

[0036] In this embodiment, the mounting base 311 is an I-shaped mounting base to improve the strength of the position-limiting mounting member 31. After the position-limiting mounting member 31 is installed, cement is poured until it is flush with the upper surface of the I-shaped mounting base 311, thereby further improving the bearing capacity of the wind turbine tower and ensuring the safe and reliable operation of the wind turbine tower. In other embodiments, the structural form of the mounting base 311 can be used as long as it can achieve effective installation of the bottom reinforcement sleeve 23.

[0037] More preferably, the limit block 313 is provided with an elastic member installation groove 3131, and the elastic anchor plate 34 includes a step limit section 341, a tapered transition section 343 and a small diameter installation section 342 connected in sequence. The step limit section 341 is located at the end of the limit block 313 at the lower limit of the force of the anchor ring 32, so that the prestressed cable 24 is effectively tightened and limited; the small diameter installation section 342 and the tapered transition section 343 are located in the elastic member installation groove 3131, and the adjustment spring 35 is sleeved on the small diameter installation section 342 to reliably limit the installation of the adjustment spring 35. While ensuring that the prestressed cable 24 is effectively tightened and limited, the elastic anchor plate 34 and the adjustment spring 35 can be reasonably and effectively arranged when combined, and the structure is compact and occupies little space.

[0038] In this embodiment, the top of the prestressed cable 24 is hinged to the reinforcement ring 22 through the hinge block 4 to form a flexible connection, control the deflection change of the middle and upper part of the tower, and reduce the buckling failure of the middle and upper part of the tower body 1. In this embodiment, the prestressed cable 24 is a prestressed steel strand. The number of prestressed steel strands can be determined according to the load of the wind power tower.

[0039] In this embodiment, the limit block 313 is provided with a tapered portion 3132. When the prestressed cable 24 swings, the provision of the tapered portion 3132 can increase the tensile and compressive bearing capacity of the tensioning portion of the prestressed cable 24, thereby achieving the purpose of buffering vibration.

[0040] like Figure 5 As shown, the bottom sleeve 231 includes two semi-annular sleeves 2311 and two adjustment components, and the two adjustment components are arranged between the two semi-annular sleeves 2311. The adjustment component includes a plurality of bolt adjustment components, and the plurality of bolt adjustment components are arranged at intervals along the axial direction of the adjustment sleeve 211; the bolt adjustment component includes an adjustment bolt 2312, two adjustment nuts 2313 and two limiting protrusions 2314, and the two limiting protrusions 2314 are respectively arranged in the corresponding semi-annular sleeves 2311, and the adjustment bolt 2312 passes through the two limiting protrusions 2314, and the two adjustment nuts 2313 are screwed to the two ends of the adjustment bolt 2312 and are limitedly matched with the limiting protrusions 2314. This allows the bottom sleeve 231 to be flexibly adjusted according to the size of the tower body 1, and it is easy to adjust and has a simple structure.

[0041] Furthermore, the bottom sleeve 231 includes a plurality of tower sections 2315, which are arranged along the axial direction of the tower body 1 to facilitate installation and maintenance. At the same time, the tower section 2315 at the bottom is provided with a door opening through hole 2316 corresponding to the door opening of the tower body 1 to facilitate personnel to enter the interior of the tower body 1. In this embodiment, adjacent tower sections 2315 are fixedly connected by applying epoxy resin; in other embodiments, threaded connection or the like may also be adopted.

[0042] like Figure 4 As shown, the middle and upper reinforcement sleeve 21 includes an adjustment sleeve 211 and an adjustment binding wire 212. The adjustment sleeve 211 has an opening, and the outer surface of the adjustment sleeve 211 along the axial direction is provided with a plurality of limiting annular seams, and the number of the limiting annular seams is the same as that of the adjustment binding wire 212. The adjustment binding wire 212 is arranged in the corresponding limiting annular seams, and the opening size of the adjustment sleeve 211 is adjusted by adjusting the tightness of the binding wire 212, so that the adjustment sleeve 211 and the tower body 1 are effectively fitted and tightly embraced to ensure the bearing capacity of the middle and upper part of the tower. Furthermore, in order to ensure the reliability of the connection, the contact surface between the adjustment sleeve 211 and the tower body 1 can be reinforced and connected by a weld.

[0043] In this embodiment, a plurality of reinforcing ribs 221 are provided inside the reinforcing ring 22. The plurality of reinforcing ribs 221 are arranged along the circumference of the tower body 1, and the two ends of adjacent reinforcing ribs 221 are connected to each other and respectively installed on the reinforcing ring 22 and the tower body 1, which improves the support strength of the reinforcing ring 22 and ensures a reliable and effective connection with the prestressed cable 24.

[0044] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A reinforced wind turbine tower, comprising a tower body and a tower reinforcement assembly, characterized in that: The tower reinforcement assembly includes a middle and upper reinforcement sleeve, a bottom reinforcement sleeve, a reinforcement ring and at least two prestressed cables arranged at intervals along the circumference of the tower body. The middle and upper reinforcement sleeve and the bottom reinforcement sleeve are both tightly fitted on the tower body, and the middle and upper reinforcement sleeve is located above the bottom reinforcement sleeve; the reinforcement ring is tightly fitted on the middle and upper reinforcement sleeve; the prestressed cable is connected between the reinforcement ring and the bottom reinforcement sleeve in a stretched state.

2. The reinforced wind turbine tower according to claim 1, characterized in that: The bottom reinforcement sleeve includes a bottom sleeve and a bottom tray that are interconnected, the prestressed cable is connected to the bottom tray through a tensioning anchor, and the tensioning anchor includes a limit mounting piece, an anchor ring, a prestressed clip, an elastic anchor plate and an adjusting spring, wherein the limit mounting piece is installed on the bottom tray, the prestressed cable is tightened and limited to the limit mounting piece by the prestressed clip and the anchor ring; the elastic anchor plate is arranged between the anchor ring and the limit mounting piece, and the adjusting spring is arranged between the elastic anchor plate and the limit mounting piece.

3. The reinforced wind turbine tower according to claim 2, characterized in that: The limiting mounting component includes a mounting base connected to the bottom tray, a mounting frame arranged on the mounting base, and a limiting block arranged on the upper frame position of the mounting frame, wherein a receiving cavity is formed in the middle of the mounting frame; the bottom end of the prestressed cable passes through the limiting block and is placed in the receiving cavity; the anchor ring clamps the bottom end of the prestressed cable through the prestressed clip and cooperates with the limiting block.

4. The reinforced wind turbine tower according to claim 3, characterized in that: The limit block is provided with an elastic member mounting groove, and the elastic anchor plate includes a step limit section, a tapered transition section and a small-diameter mounting section connected in sequence, and the step limit section is located at the end of the limit block at the lower limit of the force of the anchor ring; the small-diameter mounting section and the tapered transition section are located in the elastic member mounting groove, and the adjusting spring is sleeved on the small-diameter mounting section.

5. The reinforced wind turbine tower according to claim 3, characterized in that: The limit block is provided with a tapered portion for increasing the tensile and compressive bearing capacity of the prestressed cable tensioning position.

6. The reinforced wind turbine tower according to any one of claims 2 to 5, characterized in that: The bottom sleeve includes two semi-annular sleeves and an adjustment assembly arranged between the two semi-annular sleeves, the adjustment assembly includes a plurality of bolt adjustment components arranged axially at intervals along the semi-annular sleeves, the bolt adjustment components include an adjustment bolt, two adjustment nuts and two limiting protrusions, the two limiting protrusions are respectively arranged on the corresponding semi-annular sleeves, the adjustment bolt passes through the two limiting protrusions, the two adjusting nuts are screwed to the two ends of the adjustment bolt and cooperate with the limiting protrusions.

7. The reinforced wind turbine tower according to claim 6, characterized in that: The bottom sleeve includes a plurality of tower sections arranged axially along the tower body, and the tower section located at the bottom is provided with a door opening through hole corresponding to the door opening of the tower body.

8. The reinforced wind turbine tower according to any one of claims 1 to 5, characterized in that: The middle and upper reinforcement sleeve includes an adjustment sleeve with an opening, and an adjustment binding wire that ensures the adjustment sleeve fits the tower body. The outer surface of the adjustment sleeve along the axial direction is provided with limiting ring gaps with the same number as the adjusting binding wires, and the adjusting binding wires are arranged in the corresponding limiting ring gaps.

9. The reinforced wind turbine tower according to any one of claims 1 to 5, characterized in that: A plurality of reinforcing ribs are provided on the inner side of the reinforcing ring, and the plurality of reinforcing ribs are arranged along the circumference of the tower body. Both ends of adjacent reinforcing ribs are connected to each other and are respectively installed on the reinforcing ring and the tower body.

10. The reinforced wind turbine tower according to any one of claims 1 to 5, characterized in that: The prestressed cable is hinged to the reinforcement ring through a hinge block.

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