Supporting device for communication line erection and use method thereof

Abstract

The invention relates to the technical field of telecommunication network infrastructure, and discloses a supporting device for communication line erection and a using method thereof, and the supporting device comprises a supporting mechanism which comprises a supporting column and an adjusting assembly arranged at the top of the supporting column; the elastic compensation mechanism comprises a semicircular hoop body used for positioning the communication rod and a first arc-shaped groove formed in the side, close to the positioning communication rod, of the semicircular hoop body. Semicircular hoop bodies and wave-shaped spring steel sheets which are symmetrically arranged are adopted by the elastic compensation mechanism, all-directional uniform stress is achieved in cooperation with a rubber sleeve wrapping the elastic compensation mechanism in the whole circumferential direction, the fixing assembly forms balanced locking force through a multi-point limiting rod and a fixing base, and a rotating shaft and a supporting arm of the adjusting assembly ensure that supporting force is symmetrically transmitted; due to the buffering design of the damping assembly, vibration energy is effectively absorbed, pre-tightening force attenuation is prevented, the defect of uneven stress of a traditional single-bolt fastening mode is overcome, and installation reliability and long-term stability are remarkably improved.

Description

Technical Field

[0001] This invention relates to the technical field of telecommunications network infrastructure, and in particular to a support device for erecting communication lines and its usage method. Background Technology

[0002] Support devices for communication line erection are key components in the construction of communication infrastructure. They are mainly used to fix, suspend, or support overhead cables (such as optical fibers and electrical cables) to ensure their stable deployment in different geographical environments (such as cities, mountains, and across rivers).

[0003] Traditional clamp structures typically use a single bolt for fastening, which leads to significant uneven stress distribution during installation and long-term use. When tightening, the force on both sides of the clamp is inconsistent, with the side closer to the bolt being over-pressurized while the side farther from the bolt is not sufficiently fitted, resulting in poor fixing effect. Under vibration or temperature change environments, this uneven stress distribution will be further aggravated, causing the preload to decay rapidly and eventually leading to the clamp loosening, affecting the reliability of equipment fixation. Summary of the Invention

[0004] In view of the problems existing in the support devices for the construction of communication lines, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a support device for erecting communication lines and a method for using it.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: including,

[0007] The support mechanism includes a support column and an adjustment assembly disposed on top of the support column;

[0008] The elastic compensation mechanism includes a semi-circular hoop for positioning the communication pole, a first arc-shaped groove opened on the side of the semi-circular hoop near the positioning communication pole, a rubber sleeve locked in the inner cavity of the first arc-shaped groove, a second arc-shaped groove opened on the outer side of the semi-circular hoop, and a corrugated spring steel sheet movably locked in the inner cavity of the second arc-shaped groove.

[0009] As a preferred embodiment of the support device for erecting communication lines according to the present invention, the support mechanism further includes a damping component disposed at the bottom of the support column and a fixing component disposed outside the adjusting component.

[0010] As a preferred embodiment of the support device for erecting communication lines according to the present invention, the elastic compensation mechanism further includes a locking block fixedly installed on the outside of the semi-circular hoop, an insertion hole opened on the outside of the locking block, and a positioning vertical plate fixedly installed on the outside of the semi-circular hoop.

[0011] As a preferred embodiment of the support device for erecting communication lines according to the present invention, the adjustment assembly includes an arm fixedly installed on the top of the support column, a bearing fixedly installed on the outside of the arm, and a rotating shaft hinged to the inner cavity of the bearing.

[0012] As a preferred embodiment of the support device for erecting communication lines according to the present invention, the adjustment assembly further includes a support arm fixedly installed on the outside of the rotating shaft, and a connecting column fixedly installed on the outside of the support arm.

[0013] As a preferred embodiment of the support device for erecting communication lines according to the present invention, the inner surface of the rubber sleeve is provided with anti-slip ridges, and the wave-shaped spring steel sheet is arranged in a continuous wave pattern.

[0014] As a preferred embodiment of the support device for erecting communication lines according to the present invention, the damping component includes a base, a fixing block fixedly installed on the top of the base, and a hydraulic damper fixedly installed on the top of the fixing block.

[0015] As a preferred embodiment of the support device for erecting communication lines according to the present invention, the damping assembly further includes a silicone buffer pad fixedly installed on the top of the hydraulic damper, and a support plate fixedly installed on the top of the silicone buffer pad, wherein the top of the support plate is fixedly connected to the bottom of the support column.

[0016] As a preferred embodiment of the support device for erecting communication lines according to the present invention, the fixing component includes a fixing rod fixedly installed at the end of the connecting column, a limiting rod fixedly installed on one side of the fixing rod, a fixing seat fixedly installed on the other side of the fixing rod, a slot formed in the inner cavity of the fixing seat, and a mounting hole formed on the outer side of the fixing seat.

[0017] The present invention also provides a method of use.

[0018] This invention provides the following technical solution: a method of use, including the aforementioned support device for erecting communication lines, the method comprising the following steps:

[0019] S1: Fix the base of the damping component in the preset position to form a shock-absorbing foundation through the hydraulic damper and silicone buffer pad;

[0020] S2: The adjustment component of the support mechanism drives the support arm to rotate to a predetermined angle through the rotating shaft, and is positioned and locked by the limit rod of the fixed component;

[0021] S3: Place the communication pole inside the semi-circular hoop of the elastic compensation mechanism, and achieve initial fixation through the elastic deformation of the rubber sleeve;

[0022] S4: Close the semi-circular hoop to generate pre-tightening force on the wavy spring steel sheet, and quickly lock it in place through the locking block and the insertion hole;

[0023] S5: Use the positioning plate to calibrate the verticality, ensure the installation accuracy of the communication pole, check the tightness of each connection, and complete the installation and debugging of the communication line erection support device.

[0024] The beneficial effects of this invention are as follows: By using a symmetrically arranged semi-circular hoop and wave-shaped spring steel sheet in the elastic compensation mechanism, combined with a rubber sleeve that wraps around the entire circumference, uniform force is achieved in all directions. The fixing component forms a balanced locking force through multi-point limiting rods and fixing seats. The rotating shaft and support arm of the adjusting component ensure symmetrical transmission of the supporting force. The buffer design of the damping component effectively absorbs vibration energy and prevents preload attenuation. This eliminates the uneven force defects of the traditional single-bolt fastening method and significantly improves installation reliability and long-term stability. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective.

[0028] Figure 3 This is a partial cross-sectional view of the semi-circular hoop structure of the present invention.

[0029] Figure 4 This is a schematic plan view of the rubber sleeve and corrugated spring steel sheet structure of the present invention.

[0030] Figure 5 This is a partial schematic diagram of the fixed component structure of the present invention.

[0031] In the picture:

[0032] 100. Support mechanism; 110. Column; 120. Adjustment assembly; 121. Arm; 122. Bearing seat; 123. Rotating shaft; 124. Support arm; 125. Connecting column; 130. Damping assembly; 131. Base; 132. Fixing block; 133. Hydraulic damper; 134. Silicone buffer pad; 135. Support plate; 140. Fixing assembly; 141. Fixing rod; 142. Limiting rod; 143. Fixing seat; 144. Slot; 145. Mounting hole;

[0033] 200, Elastic compensation mechanism; 210, Semi-circular hoop; 220, First arc groove; 230, Rubber sleeve; 240, Second arc groove; 250, Corrugated spring steel sheet; 260, Locking block; 270, Insertion hole; 280, Positioning vertical plate. Detailed Implementation

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0037] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0038] Example 1

[0039] Reference Figures 1-5 This is the first embodiment of the present invention, which provides a support device for erecting communication lines. This device includes...

[0040] The support mechanism 100 includes a support column 110 and an adjustment assembly 120 disposed on the top of the support column 110;

[0041] The elastic compensation mechanism 200 includes a semi-circular hoop 210 for positioning the communication pole, a first arc-shaped groove 220 opened on the side of the semi-circular hoop 210 near the positioning communication pole, a rubber sleeve 230 locked in the inner cavity of the first arc-shaped groove 220, a second arc-shaped groove 240 opened on the outer side of the semi-circular hoop 210, and a wave-shaped spring steel sheet 250 movably locked in the inner cavity of the second arc-shaped groove 240.

[0042] The support mechanism 100 and the elastic compensation mechanism 200 effectively support and fix the communication pole. The support column 110 of the support mechanism 100 provides stable vertical support, while the adjustment component 120 facilitates height and angle adjustment according to site conditions. The semi-circular hoop 210 of the elastic compensation mechanism 200, through the double buffer design of rubber sleeve 230 and corrugated spring steel sheet 250, ensures the firmness of the clamping and effectively absorbs the vibration and displacement of the communication pole, thereby improving the stability and service life of the entire support device.

[0043] Specifically, the support mechanism 100 also includes a damping component 130 disposed at the bottom of the support column 110, and a fixing component 140 disposed outside the adjustment component 120.

[0044] Among them, the damping component 130 can effectively absorb vibrations and impacts from the ground and prevent vibrations from being transmitted to the communication pole, while the fixing component 140 enhances the fixing effect of the adjusting component 120, ensuring that it can remain stable after adjustment and preventing loosening or displacement due to external forces, thereby ensuring the accurate positioning of the communication pole.

[0045] Furthermore, the elastic compensation mechanism 200 also includes a locking block 260 fixedly installed on the outside of the semi-circular hoop 210, an insertion hole 270 opened on the outside of the locking block 260, and a positioning vertical plate 280 fixedly installed on the outside of the semi-circular hoop 210.

[0046] Among them, the addition of the locking block 260, the socket 270 and the positioning vertical plate 280 to the elastic compensation mechanism 200 significantly improves the ease of installation and positioning accuracy. The combined design of the locking block 260 and the socket 270 enables quick disassembly and positioning locking, greatly improving construction efficiency. The positioning vertical plate 280 provides an intuitive reference benchmark for adjusting the verticality of the communication pole, ensuring installation accuracy and avoiding communication signal transmission problems caused by angular deviation.

[0047] Preferably, the adjustment assembly 120 includes an arm 121 fixedly mounted on the top of the support column 110, a bearing 122 fixedly mounted on the outside of the arm 121, and a rotating shaft 123 hinged to the inner cavity of the bearing 122. The adjustment assembly 120 also includes a support arm 124 fixedly mounted on the outside of the rotating shaft 123, and a connecting column 125 fixedly mounted on the outside of the support arm 124.

[0048] The adjustment component 120 adopts a three-stage linkage design of arm 121, bearing 122, and rotating shaft 123, realizing flexible adjustment in multiple angles and directions. It not only has a large adjustment range but is also easy to operate, adapting to the requirements of different terrains and installation environments. The hinged design of bearing 122 and rotating shaft 123 ensures the smoothness of the adjustment process, avoids jamming, and improves adjustment accuracy and user experience. The extension design of support arm 124 increases the adjustment range, while connecting column 125 provides a reliable connection foundation for fixing component 140, ensuring structural stability and facilitating later maintenance and component replacement, thus improving product maintainability and service life.

[0049] It should be noted that the inner surface of the rubber sleeve 230 is provided with anti-slip ridges, and the wave-shaped spring steel sheet 250 is arranged in a continuous wave pattern.

[0050] The anti-slip ridges on the inner surface of the rubber sleeve 230 and the continuous wave arrangement of the corrugated spring steel sheet 250 together form a double anti-slip buffer system, which not only ensures the firmness of the clamping, but also effectively absorbs vibration and prevents the communication pole from sliding or displacing under the action of wind or other external forces. At the same time, this elastic compensation mechanism 200 can also adapt to the thermal expansion and contraction of the communication pole and avoid stress concentration caused by temperature changes.

[0051] Furthermore, the fixing assembly 140 includes a fixing rod 141 fixedly installed at the end of the connecting column 125, a limiting rod 142 fixedly installed on one side of the fixing rod 141, a fixing seat 143 fixedly installed on the other side of the fixing rod 141, a slot 144 opened in the inner cavity of the fixing seat 143, and a mounting hole 145 opened on the outer side of the fixing seat 143.

[0052] The fixing rod 141, limiting rod 142, fixing seat 143, slot 144 and mounting hole 145 of the fixing component 140 together constitute a complete quick locking system, which not only realizes quick fixing after adjustment, but also ensures the reliability of fixing through multiple limiting and locking mechanisms. The matching design of slot 144 and mounting hole 145 facilitates connection with other components and improves the compatibility and expandability of the entire system.

[0053] In use, the communication pole is first positioned by the semi-circular hoop 210 of the elastic compensation mechanism 200. The rubber sleeve 230 and the wave-shaped spring steel sheet 250 provide initial clamping and buffering. After the adjustment component 120 is adjusted to the optimal support angle by the rotating shaft 123 and the support arm 124, it is locked by the limit rod 142 and the fixed seat 143 of the fixing component 140. During operation, ground vibration is absorbed in stages by the hydraulic damper 133 and the silicone buffer pad 134 of the damping component 130. The remaining vibration is further attenuated by the elastic compensation mechanism 200, forming a complete vibration reduction protection chain.

[0054] In summary, the coordinated operation of the support mechanism 100 and the elastic compensation mechanism 200 achieves stable support and dynamic buffering for the communication pole. The combined design of the support column 110 and the adjustment component 120 provides multi-angle adjustment functionality, while the damping component 130 effectively absorbs ground vibrations. The semi-circular hoop 210 ensures clamping reliability through the dual buffering design of the rubber sleeve 230 and the corrugated spring steel sheet 250. The fixing component 140, the locking block 260, and the positioning vertical plate 280 together improve installation accuracy and stability, ensuring both support strength and good environmental adaptability.

[0055] Example 2

[0056] Reference Figure 1 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that by adopting a combination design of a three-stage vibration reduction system and a secondary buffer structure in the damping component 130, the graded absorption of vibrations at different frequencies is achieved, which significantly improves the stability of the communication pole in complex environments.

[0057] Furthermore, the damping assembly 130 includes a base 131, a fixing block 132 fixedly installed on the top of the base 131, and a hydraulic damper 133 fixedly installed on the top of the fixing block 132. The damping assembly 130 also includes a silicone buffer pad 134 fixedly installed on the top of the hydraulic damper 133, and a support plate 135 fixedly installed on the top of the silicone buffer pad 134. The top of the support plate 135 is fixedly connected to the bottom of the support column 110.

[0058] The damping component 130 adopts a three-stage vibration reduction design consisting of a base 131, a fixing block 132, and a hydraulic damper 133, forming a complete vibration absorption system. The hydraulic damper 133 can effectively attenuate the vibration energy from the ground, while the fixing block 132 provides a stable installation foundation for the entire vibration reduction system, significantly reducing the impact of vibration on communication equipment and improving the stability of signal transmission.

[0059] The addition of silicone buffer pad 134 and support plate 135 further improves the function of damping component 130. Silicone buffer pad 134 provides secondary buffering, complementing hydraulic damper 133 to achieve more comprehensive vibration absorption. Support plate 135 ensures reliable connection between support column 110 and damping component 130, ensuring support strength and effectively transmitting and dispersing vibration energy.

[0060] During use, external vibration energy is first transmitted to the fixed block 132 through the base 131. The hydraulic damper 133 absorbs and attenuates the main vibration energy. The remaining high-frequency vibration components are filtered a second time through the silicone buffer pad 134. Finally, the vibration energy reaching the support column 110 is significantly reduced through the balanced transmission of the support plate 135. This achieves the gradual attenuation and multi-level absorption of vibration energy, forming an optimized vibration transmission path and ensuring the stability of the communication pole.

[0061] In summary, the stable foundation formed by the base 131 and the fixing block 132, combined with the effective attenuation of low-frequency vibration by the hydraulic damper 133 and the absorption of high-frequency vibration by the silicone buffer pad 134, constitutes a complete multi-band vibration control system. The transition connection design of the support plate 135 not only ensures the effective transmission of load but also avoids the vibration transmission problem caused by rigid connection. This composite vibration reduction structure can adapt to various geological conditions and climatic environments, ensuring that communication equipment maintains a stable working state under various external interferences, while greatly extending the service life of the support device.

[0062] Example 3

[0063] Reference Figures 1-5 This is the third embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a method of use, which includes the following steps:

[0064] S1: Foundation positioning and installation: Fix the base 131 of the damping component 130 to the preset foundation position, ensure that the fixing block 132 is level with the ground, and firmly fix the entire support device with anchor bolts;

[0065] S2: Height and angle adjustment: The support arm 124 is rotated by the pivot 123 of the adjustment component 120, and the limiting rod 142 of the fixing component 140 is used for precise positioning, so that the connecting column 125 is adjusted to the optimal support angle.

[0066] S3: Pre-fixing of the communication pole: The communication pole is placed inside the semi-circular hoop 210 of the elastic compensation mechanism 200, and the elastic deformation of the rubber sleeve 230 is used to achieve initial fixation, ensuring that the communication pole is completely in contact with the first arc groove 220;

[0067] S4: Locking and compensation adjustment closes the semi-circular hoop 210, so that the wave-shaped spring steel sheet 250 generates a pre-tightening force, and completes rapid locking through the locking block 260 and the insertion hole 270, while maintaining an appropriate elastic compensation space;

[0068] S5: Verticality calibration is performed by positioning the vertical plate 280 for precise verticality calibration. The verticality of the communication pole is detected by using a level and the angle of the fine adjustment component 120 is adjusted if necessary.

[0069] S6: Vibration test and final fixation. Apply test vibration to the installed communication pole, observe the working status of the damping component 130, and after confirming the vibration absorption effect, finally tighten all connecting parts.

[0070] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0071] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0072] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A support device for erecting communication lines, characterized in that: include, The support mechanism (100) includes a support column (110) and an adjustment assembly (120) disposed on top of the support column (110); The elastic compensation mechanism (200) includes a semi-circular hoop (210) for positioning the communication pole, a first arc-shaped groove (220) opened on the side of the semi-circular hoop (210) near the positioning communication pole, a rubber sleeve (230) locked in the inner cavity of the first arc-shaped groove (220), a second arc-shaped groove (240) opened on the outer side of the semi-circular hoop (210), and a wave-shaped spring steel sheet (250) movably locked in the inner cavity of the second arc-shaped groove (240).

2. The support device for erecting communication lines according to claim 1, characterized in that: The support mechanism (100) further includes a damping component (130) disposed at the bottom of the support column (110) and a fixing component (140) disposed outside the adjusting component (120).

3. The support device for erecting communication lines according to claim 2, characterized in that: The elastic compensation mechanism (200) also includes a locking block (260) fixedly installed on the outside of the semi-circular hoop (210), an insertion hole (270) opened on the outside of the locking block (260), and a positioning vertical plate (280) fixedly installed on the outside of the semi-circular hoop (210).

4. The support device for erecting communication lines according to claim 3, characterized in that: The adjustment assembly (120) includes an arm (121) fixedly mounted on the top of the support (110), a bearing (122) fixedly mounted on the outside of the arm (121), and a rotating shaft (123) hinged to the inner cavity of the bearing (122).

5. The support device for erecting communication lines according to claim 4, characterized in that: The adjustment assembly (120) further includes a support arm (124) fixedly installed on the outside of the rotating shaft (123), and a connecting column (125) fixedly installed on the outside of the support arm (124).

6. The support device for erecting communication lines according to claim 5, characterized in that: The inner surface of the rubber sleeve (230) is provided with anti-slip ridges, and the wave-shaped spring steel sheet (250) is arranged in a continuous wave pattern.

7. The support device for erecting communication lines according to claim 6, characterized in that: The damping assembly (130) includes a base (131), a fixing block (132) fixedly mounted on the top of the base (131), and a hydraulic damper (133) fixedly mounted on the top of the fixing block (132).

8. The support device for erecting communication lines according to claim 7, characterized in that: The damping assembly (130) further includes a silicone buffer pad (134) fixedly installed on the top of the hydraulic damper (133), and a support plate (135) fixedly installed on the top of the silicone buffer pad (134), the top of the support plate (135) being fixedly connected to the bottom of the support column (110).

9. The support device for erecting communication lines according to claim 8, characterized in that: The fixing assembly (140) includes a fixing rod (141) fixedly installed at the end of the connecting column (125), a limiting rod (142) fixedly installed on one side of the fixing rod (141), a fixing seat (143) fixedly installed on the other side of the fixing rod (141), a slot (144) opened in the cavity of the fixing seat (143), and a mounting hole (145) opened on the outside of the fixing seat (143).

10. A method of use, characterized in that: The method comprising the support device for erecting communication lines as described in any one of claims 1 to 9 includes the following steps: S1: Fix the base (131) of the damping component (130) in the preset position, and form a shock-absorbing foundation through the hydraulic damper (133) and the silicone buffer pad (134); S2: The adjustment component (120) of the support mechanism (100) drives the support arm (124) to rotate to a predetermined angle through the rotating shaft (123), and is positioned and locked by the limiting rod (142) of the fixing component (140); S3: Place the communication pole inside the semi-circular hoop (210) of the elastic compensation mechanism (200) and achieve initial fixation through the elastic deformation of the rubber sleeve (230); S4: Close the semi-circular hoop (210) to generate a preload on the wave-shaped spring steel sheet (250), and quickly lock it in place through the locking block (260) and the insertion hole (270); S5: Use the positioning plate (280) to calibrate the verticality, ensure the installation accuracy of the communication pole, check the tightness of each connection part, and complete the installation and debugging of the communication line erection support device.

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