External force damage prevention device convenient for fixing stay wire

Abstract

The invention provides an external force damage prevention device convenient for fixing a stay wire, which comprises a fixing block, limiting blocks connected to two ends of the fixing block, adjusting plates arranged in clamping units and adjusting parts in threaded connection to the limiting blocks, and the fixing block and the limiting blocks form a plurality of U-shaped clamping units; the adjusting plate is arranged in the clamping unit and is movably connected with the fixing block; the fixing block is provided with a first clamping position and / or the adjusting plate is provided with a second clamping position. Due to the fact that a plurality of stay wires are connected through the device, the broken stay wires can be pulled by the unbroken stay wires, and the situation that the broken stay wires are wound on the overhead line wire even if the stay wires are broken due to large external force is achieved. Moreover, when interconnection connection is carried out after the stay wire is broken, only the stay wire needs to be loosened by the adjusting plate, the broken stay wire is taken out, then a new stay wire is replaced, and the stay wire is clamped again by the adjusting plate and the fixing block, so that the interconnection connection time is greatly saved.

Description

Technical Field

[0001] This application relates to the field of power equipment technology, and in particular to a device for preventing damage from external forces in order to facilitate the fixing of guy wires. Background Technology

[0002] Guy wires are important auxiliary facilities in power lines used to stabilize towers, balance conductor tension, and resist external forces.

[0003] In power lines, conductors experience horizontal or vertical tension due to their own weight, wind load, and icing. Guy wires, by forming a triangular stress structure with the tower, transfer this tension to the ground or adjacent support points, preventing the tower from tilting or collapsing due to uneven stress. Guy wires can also absorb some of the impact from external forces (such as vehicle collisions or fallen trees) on the tower.

[0004] The guy wire itself is highly elastic. When the guy wire is damaged by external force, such as being broken by agricultural machinery, it may break instantly due to excessive tension. The free end of the guy wire may bounce and become entangled on the pole, or in severe cases, it may directly become entangled on the overhead line conductors, causing transmission and distribution line faults. In addition, due to the high strength and poor flexibility of steel strands, it is time-consuming and laborious to interconnect broken steel strands using wire clips. Summary of the Invention

[0005] The technical problem this application aims to solve is that when existing steel strand guy wires are damaged by external force, the guy wires may break instantly due to excessive tension, posing a risk of the broken guy wires getting tangled in the overhead line conductors, and the interconnection after the guy wires break is time-consuming and laborious.

[0006] To address the aforementioned issues, this application provides a device for securing guy wires against external force damage, comprising: a cross-shaped fixing block, limiting blocks connected to both ends of the fixing block, an adjusting plate disposed within a clamping unit, and an adjusting member threadedly connected to the limiting block. The fixing block and the limiting block form multiple U-shaped clamping units. The adjusting plate is disposed within the clamping unit and movably connected to the fixing block. A first clamping position is provided on the fixing block and / or a second clamping position is provided on the adjusting plate.

[0007] The aforementioned device for securing guy wires and preventing external force damage has multiple clamping positions, capable of clamping multiple steel strands. By clamping multiple steel strands, when a guy wire is subjected to external force, the device connects multiple guy wires, allowing the broken guy wire to be held in place by the unbroken ones. This ensures that even if a guy wire breaks under significant external force, it will not become entangled in the overhead line conductor because it is fixed within the device's clamping unit. Furthermore, when interconnecting after a guy wire breakage, simply rotate the adjusting member to loosen the clamping plate on the guy wire, remove the broken guy wire, replace it with a new guy wire, and then rotate the adjusting member again to re-clamp the guy wire with the adjusting plate and fixing block, significantly saving interconnection time.

[0008] To facilitate the sliding of the adjusting plate on the fixed block, as an improvement to the aforementioned device for preventing damage from external forces and securing the guy wire, the fixed block is provided with a first limiting groove to restrict the offset movement of the adjusting plate, and the adjusting plate is provided with a sliding plate within the first limiting groove. By sliding the sliding plate within the first limiting groove, the adjusting plate can slide along a fixed trajectory, and this effectively increases the clamping force between the adjusting plate and the fixed block on the guy wire.

[0009] As one option for the first limiting groove of the aforementioned device for securing the guy wire against external force damage, the first limiting groove includes: a first groove and a second groove, wherein the first groove is perpendicular to the second groove. The sliding plate slides within the second groove.

[0010] To further improve the clamping force of the adjusting plate and the fixing block on the pull wire, as an improvement to the above-mentioned device for preventing damage from external forces in order to facilitate fixing the pull wire, the device for preventing damage from external forces in order to facilitate fixing the pull wire also includes a wedge block, which is located between the limiting block and the sliding plate.

[0011] Correspondingly, the sliding plate has a wedge-shaped structure, and the wedge-shaped inclined surface of the sliding plate abuts against the wedge-shaped inclined surface of the wedge block.

[0012] In order to achieve mutual self-locking between the sliding plate and the wedge block and improve the stability of the clamping force, as an improvement of the above-mentioned device for preventing damage by external force and facilitating the fixing of the pull wire, a number of first teeth are provided on the wedge-shaped inclined surface of the sliding plate, and a number of second teeth that cooperate with the first teeth are provided on the wedge-shaped inclined surface of the wedge block.

[0013] To prevent the wedge block from detaching from the body of the anti-tamper device that facilitates fixing the guy wire, a second limiting groove is further provided on the fixing block and / or the limiting block, and a limiting post is provided on the surface of the wedge block that contacts the fixing block and / or the limiting block. The second limiting groove is used to prevent the wedge block from detaching from the anti-tamper device that facilitates fixing the guy wire. Through the cooperation of the second limiting groove and the limiting post, the wedge block can always be positioned within the body of the anti-tamper device that facilitates fixing the guy wire.

[0014] To further improve the stability of the first clamping position and / or the second clamping position in clamping the pull wire, preferably, the shape of the clamping surface of the first clamping position and / or the second clamping position includes at least "and / or the clamping surface of the second clamping position is provided with anti-slip texture".

[0015] Furthermore, the device for preventing damage from external forces and facilitating the fixing of the guy wire can be either detachable or non-detachable. A detachable connection allows for flexible assembly of the various components of the aforementioned device for preventing damage from external forces and facilitating the fixing of the guy wire.

[0016] The technical advantages of this application are as follows: 1. The anti-external force damage device for easy fixing of guy wires provided in this application has multiple clamping positions, capable of clamping multiple steel strands. By clamping multiple steel strands, when a guy wire is subjected to external force, because the device connects multiple guy wires, the broken guy wire can be held by the unbroken guy wire. This ensures that even if the guy wire breaks under a large external force, it will not become entangled on the overhead line conductor because it is fixed within the clamping unit of the device. Furthermore, when interconnecting after a guy wire breaks, simply rotate the adjusting member to loosen the clamping of the adjusting plate on the guy wire, remove the broken guy wire, replace it with a new guy wire, and rotate the adjusting member again to re-clamp the guy wire with the adjusting plate and the fixing block, greatly saving interconnection time.

[0017] 2. Unlike conventional clamps that use wedge blocks to restrict the main body of the adjusting plate, the device provided in this application first uses an adjusting component to push the adjusting plate towards the fixed block to achieve pre-tightening clamping of the pull wire. Then, under the action of the wedge block, it is further tightened. Furthermore, a first tooth and a second tooth are provided on the surfaces where the wedge block and the adjusting plate abut against each other. The first tooth and the second tooth can achieve mutual self-locking between the sliding plate and the wedge block, thereby further improving the reliability of clamping. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating an application scenario of a device for preventing damage from external forces that facilitates the fixing of a guy wire, as described in this application embodiment. Figure 2 This is a schematic diagram of a device for preventing damage from external forces in an embodiment of this application; Figure 3 This is a top cross-sectional view of a device for preventing damage from external forces in an embodiment of this application; Figure 4 yes Figure 3 Schematic diagram of sectional view along direction AA; Figure 5 This is a schematic axial sectional view of an anti-external force damage device according to an embodiment of this application; Figure 6 This is a schematic diagram of the structure of the fixing block and the limiting block in the embodiments of this application; Figure 7 This is a schematic diagram of the anti-external force damage device with three clamping positions in the embodiments of this application.

[0019] Explanation of reference numerals in the attached figures: 1. Fixing block; 11. First limiting groove; 111. First groove; 112. Second groove; 12. First clamping position; 2. Limiting block; 21. Second limiting groove; 3. Adjusting plate; 31. Sliding plate; 311. First tooth; 32. Second clamping position; 4. Adjusting components; 5. Wedge block; 51. Second tooth; 52. Limiting post. Detailed Implementation

[0020] The following detailed description of the device for preventing damage from external forces that facilitates the fixing of guy wires is provided in conjunction with specific embodiments, so that those skilled in the art can better understand the technical solution of this application and implement it. However, the embodiments given are not intended to limit this application.

[0021] The device for preventing damage from external forces in this application, which facilitates the fixing of guy wires, is mainly used to solve the problem that existing steel strand guy wires are prone to instantaneous breakage when subjected to external forces, and that interconnection after breakage is time-consuming and laborious. The device as a whole includes a cross-shaped fixing block 1, limiting blocks 2 connected to both ends of the fixing block 1, an adjusting plate 3 set in the clamping unit, and an adjusting component 4 threadedly connected to the limiting block 2.

[0022] Reference Figure 1The diagram illustrates a guy wire securing device 100, which is connected to the guy wire 200 between the transmission tower 300 and the ground. This device is used to clamp multiple guy wires onto the same guy wire securing device 100. Clamping methods include, but are not limited to, those shown in the diagram. The aforementioned anti-external force damage device 100 for easy fixing of guy wires has multiple clamping positions, which can clamp multiple steel strand guy wires 200. By clamping multiple steel strand guy wires 200, when a guy wire 200 is subjected to external force, since the anti-external force damage device 100 for easy fixing of guy wires connects multiple guy wires 200, the broken guy wire 200 can be pulled by the unbroken guy wire 200. Thus, even if the guy wire 200 is subjected to a large external force and breaks, since the guy wire 200 is fixed in the clamping unit of the anti-external force damage device 100 for easy fixing of guy wires, the broken guy wire 200 will not be wrapped around the overhead line conductor.

[0023] Reference Figure 2 , Figure 7 In one embodiment of this application, the fixing block 1 of the device for securing the guy wire against external force damage has a cross-shaped structure, with limiting blocks 2 connected to both ends. The fixing block 1 and the limiting blocks 2 together form multiple U-shaped clamping units, which are used to accommodate and clamp the steel strand guy wire. In practical applications, the fixing block 1 and the limiting blocks 2 can be made of high-strength metal materials, such as stainless steel or cast iron, to ensure that the device has sufficient strength and durability to withstand the external force on the guy wire.

[0024] The fixing block 1 is provided with a first clamping position 12. The shape and size of the first clamping position 12 are designed according to the specifications of the steel strand pull wire. Generally, it is an arc groove that matches the outer diameter of the pull wire, so as to better fix the pull wire and prevent the pull wire from sliding during the clamping process.

[0025] The adjusting plate 3 is disposed within the clamping unit and is movably connected to the fixed block 1. This movable connection can be a sliding connection, for example, by providing a groove on the fixed block 1 and a slider on the adjusting plate 3 that cooperates with the groove, allowing the adjusting plate 3 to slide in a specific direction within the clamping unit. A second clamping position 32 is provided on the adjusting plate 3, and the structure and function of the second clamping position 32 are similar to those of the first clamping position 12. The second clamping position 32 can be a groove corresponding to the first clamping position 12. When the adjusting plate 3 moves towards the steel strand, the second clamping position 32 cooperates with the first clamping position 12 to tightly clamp the strand.

[0026] Adjusting component 4 is threadedly connected to limiting block 2 and abuts against adjusting plate 3. Adjusting component 4 is generally made of bolt, and threaded holes adapted to the bolt are provided on limiting block 2. By rotating adjusting component 4, the length of adjusting component 4 extending into the clamping unit can be changed, thereby pushing adjusting plate 3 towards fixed block 1 to achieve clamping or loosening operation of the pull cable.

[0027] How to use Installing the guy wire: When installing the steel strand guy wire, first place the guy wire on the first clamping position 12 of the fixing block 1. Then, adjust the position of the adjusting plate 3 to the appropriate position according to the diameter of the guy wire.

[0028] Clamping the cable: Rotate the adjusting member 4 so that it gradually extends into the clamping unit and abuts against the adjusting plate 3. As the adjusting member 4 continues to rotate in, the adjusting plate 3 moves towards the fixed block 1 under the push of the adjusting member 4. The first clamping position 12 and the second clamping position 32 work together to firmly clamp the cable. At this time, the cable is firmly fixed in the clamping unit of the device.

[0029] Next, install other guy wires, which are installed in different U-shaped clamping units of the same anti-external force damage device 100 as the aforementioned guy wires.

[0030] Protection against external damage and fracture When a guy wire breaks under external force, the aforementioned anti-external force device 100, which facilitates fixing the guy wire, has multiple clamping positions that can clamp multiple steel strand guy wires 200. By clamping multiple steel strand guy wires 200, when a guy wire 200 is subjected to external force, since the anti-external force device 100 connects multiple guy wires 200, the broken guy wire 200 can be held by the unbroken guy wire 200. Thus, even if the guy wire 200 is subjected to a large external force and breaks, since the guy wire 200 is fixed in the clamping unit of the anti-external force device 100, the broken guy wire 200 will not become entangled on the overhead line conductor.

[0031] When performing interconnection after the pull wire breaks, simply rotate the adjusting piece 4 on a certain clamping position to loosen the clamping of the pull wire by the adjusting plate 3, remove the broken pull wire, replace it with a new pull wire, and repeat the above installation and clamping steps. This greatly saves time and manpower for interconnection.

[0032] Continue to refer to Figure 1In some embodiments, the fixing block 1 is provided with a first limiting groove 11 for restricting the movement of the adjusting plate 3. The first limiting groove 11 is formed along the direction of the adjusting plate 3 towards or away from the first clamping position. A corresponding sliding plate 31 is provided on the adjusting plate 3, which slides within the first limiting groove 11, and the shape of the sliding plate 31 is adapted to the first limiting groove 11. By providing the first limiting groove 11 and the sliding plate 31, the offset movement of the adjusting plate 3 is effectively restricted, so that the adjusting plate 3 can only move in a straight line along the direction of the first limiting groove 11. This helps to control the magnitude of the clamping force when adjusting the wire clamping force, and avoids uneven force on the wire due to the offset of the adjusting plate 3, thereby improving the fixing effect of the device on the wire.

[0033] Continue to refer to Figure 2 , Figure 6 Based on the above embodiments, in some preferred embodiments, the first limiting groove 11 includes: a first groove 111 and a second groove 112, wherein the first groove 111 is perpendicular to the second groove 112. The sliding plate 31 is located within the second groove 112.

[0034] Reference Figures 4-5 Based on the above embodiments, in some preferred embodiments, a wedge block 5 is further included, which is located between the limiting block 2 and the sliding plate 31. The sliding plate 31 has a wedge-shaped structure, and the wedge-shaped inclined surface of the sliding plate 31 abuts against the wedge-shaped inclined surface of the wedge block 5. The wedge block 5 is disposed inside the limiting block 2 and abuts against the sliding plate 31. When the adjusting member 4 pushes the adjusting plate 3, the wedge block 5 plays an auxiliary support and guiding role. The addition of the wedge block 5 enhances the force distribution of the clamping unit, disperses the tension of the pull wire, prevents device damage caused by local stress concentration, and improves the stability and durability of clamping. The wedge-shaped inclined surface of the sliding plate 31 and the wedge-shaped inclined surface of the wedge block 5 are closely fitted. When the adjusting plate 3 moves, the two wedge-shaped inclined surfaces slide against each other, enhancing the clamping force, preventing the pull wire from loosening under vibration or external impact, and ensuring the reliability of the device.

[0035] Continue to refer to Figures 4-5 Based on the above embodiments, in some preferred embodiments, a plurality of first teeth 311 are provided on the wedge-shaped inclined surface of the sliding plate 31, and a plurality of second teeth 51 are provided on the wedge-shaped inclined surface of the wedge block 5 to cooperate with the first teeth 311. The first teeth 311 are evenly distributed on the wedge-shaped inclined surface of the sliding plate 31, and the second teeth 51 are also distributed on the wedge-shaped inclined surface of the wedge block 5 in the same manner. The evenly distributed teeth can make the force transmission more uniform and avoid damage to the teeth due to excessive local force. At the same time, this distribution method is also conducive to improving the stability of the movement of the adjusting plate 3 and reducing shaking and deviation.

[0036] The first tooth 311 of the sliding plate 31 is tightly engaged with the second tooth 51 of the wedge block 5. When the adjusting plate 3 moves, the two wedge-shaped inclined surfaces slide against each other, generating a self-locking effect. The first tooth 311 engages with the second tooth 51, and the first tooth 311 and the second tooth 51 mesh when the inclined surfaces abut, forming a meshing structure. Self-locking is achieved through the abutment of the inclined surfaces, which enhances the clamping force, prevents the pull wire from loosening under vibration or external impact, ensures the reliability of the device, and prevents the adjusting plate 3 from retracting when subjected to force.

[0037] Continue to refer to Figure 4 and Figure 5 Based on the above embodiments, in some preferred embodiments, a second limiting groove 21 is provided on the fixing block 1 and / or the limiting block 2, and a limiting post 52 is provided on the surface of the wedge block 5 that is in contact with the fixing block 1 and / or the limiting block 2. The second limiting groove 21 is used to prevent the wedge block 5 from disengaging from the anti-external force damage device that facilitates fixing the pull wire.

[0038] The second limiting groove 21 is provided on both sides of the limiting block 2, and both have a certain depth, but the second limiting grooves 21 on both sides of the limiting block 2 are not connected. The limiting post 52 is provided on both sides of the wedge block 5, and the limiting post 52 on both sides of the wedge block 5 is located in the second limiting groove 21 on both sides of the limiting block 2, thereby realizing the limiting of the wedge block 5 by the second limiting groove 21 and preventing the wedge block 5 from detaching from the device body. Continue to refer to Figure 1 Based on the above embodiments, in some preferred embodiments, the shape of the clamping surface of the first clamping position 12 and / or the second clamping position 32 includes at least one of the shapes of "(", "<", and "〔". Based on the above embodiments, in some preferred embodiments, the clamping surface of the first clamping position 12 and / or the second clamping position 32 is provided with anti-slip texture.

[0039] The "(" shaped clamping surface has an arc-shaped concave shape, with its opening facing the direction in which the draw wire enters. The "(" shaped clamping surface has a certain degree of containment and can fit the outer contour of the draw wire well. The "<" shaped clamping surface consists of two inclined planes forming a clamping opening, which has strong guiding and clamping properties. The "〔" shaped clamping surface has a relatively deep groove with certain height on both sides, which can provide strong containment and restraint.

[0040] Continue to refer to Figures 2-6 Based on the above embodiments, in some preferred embodiments, the device for preventing damage from external forces that facilitates fixing the pull wire is either detachable or non-detachable.

[0041] For example, detachable connections (such as bolts) can be used when maintenance is required, while non-detachable connections (such as welding) can be used for permanent installation. Detachable connections facilitate device replacement and maintenance, while non-detachable connections provide higher structural strength. This implementation increases the flexibility of the device and adapts to the needs of different power lines.

[0042] In a device designed to prevent damage from external forces and facilitate the fixing of the guy wire, bolt-nut connections can be used between the fixing block 1 and the limiting block 2, and between the adjusting plate 3 and other related components. For example, threaded lugs with connecting holes can be provided at both ends of the fixing block 1, and through holes can be provided at corresponding positions on the limiting block 2. During installation, bolts are passed through the through holes of the limiting block 2 and the threaded holes of the connecting lugs of the fixing block 1, and then nuts are tightened. This connection method is simple, reliable, and easy to disassemble and assemble. A similar design can be used for the connection between the adjusting plate 3 and other components, such as providing threaded holes on the adjusting plate 3 and connecting it to related structures with bolts.

[0043] Finally, it should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0044] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments of this application, the technical terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0046] In the description of the embodiments of this application, unless otherwise explicitly specified and limited, the technical terms such as "set", "equipped with", "installed", "connected", "fixed" and so on should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral part, or a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0047] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 therein. Such 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 this application.

Claims

1. A device for preventing damage from external forces by facilitating the fixing of guy wires, characterized in that, include: A cross-shaped fixing block (1) and a limiting block (2) connected to both ends of the fixing block, the fixing block (1) and the limiting block (2) form a plurality of U-shaped clamping units; An adjusting plate (3) is disposed within the clamping unit and is movably connected to the fixing block (1); Adjusting member (4) is threaded onto the limiting block (2) and abuts against the adjusting plate; The fixing block (1) is provided with a first clamping position (12) and / or the adjusting plate (3) is provided with a second clamping position (32).

2. The device for preventing external damage and facilitating the fixing of the guy wire according to claim 1, characterized in that, The fixed block (1) is provided with a first limiting groove (11) for limiting the offset movement of the adjusting plate (3), and the adjusting plate (3) is provided with a sliding plate (31) in the first limiting groove (11).

3. The anti-external force damage device for easy fixing of the guy wire according to claim 2, characterized in that, The first limiting groove (11) includes a first groove (111) and a second groove (112), wherein the first groove (111) is perpendicular to the second groove (112).

4. The anti-external force damage device for easy fixing of the guy wire according to claim 2, characterized in that, It also includes a wedge block (5), which is located between the limiting block (2) and the sliding plate (31).

5. The anti-external force damage device for easy fixing of the guy wire according to claim 4, characterized in that, The sliding plate (31) has a wedge-shaped structure, and the wedge-shaped inclined surface of the sliding plate (31) abuts against the wedge-shaped inclined surface of the wedge block (5).

6. The anti-external force damage device for easy fixing of the guy wire according to claim 5, characterized in that, The sliding plate (31) has a plurality of first teeth (311) on its wedge-shaped inclined surface, and the wedge-shaped block (5) has a plurality of second teeth (51) on its wedge-shaped inclined surface that cooperate with the first teeth (311).

7. The anti-external force damage device for easy fixing of the guy wire according to claim 5, characterized in that, A second limiting groove (21) is provided on the fixing block (1) and / or the limiting block (2), and a limiting post (52) is provided on the surface of the wedge block (5) that is in contact with the fixing block (1) and / or the limiting block (2). The second limiting groove (21) is used to prevent the wedge block (5) from disengaging from the anti-external force damage device that facilitates fixing the pull wire.

8. The anti-external force damage device for easy fixing of the guy wire according to claim 1, characterized in that, The shape of the clamping surface of the first clamping position (12) and / or the second clamping position (32) includes at least one of the following: (", <, and [).

9. The anti-external force damage device for easy fixing of the guy wire according to claim 8, characterized in that, The clamping surfaces of the first clamping position (12) and / or the second clamping position (32) are provided with anti-slip textures.

10. The device for preventing damage from external forces by facilitating the fixing of the guy wire according to any one of claims 1 to 9, characterized in that, The device for securing the guy wire and preventing damage from external forces can be either detachable or non-detachable.

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